How many maintenance methods of vacuum pump?

The vacuum pump starts the winding and transpiration system respectively to investigate whether the reading of the vacuum gauge climbs after a short decline, which can preliminarily judge the direction of the internal leakage point. The internal leakage mostly occurs on the equipment with water cooling points. No doubt is found in the external leakage inspection, but there are the following phenomena: the pumping speed of the mechanical pump is significantly low, the indication value of the vacuum gauge is low, and the mechanical pump oil emulsifies quickly.
The iron-based parts in the vacuum chamber are significantly rusted. With the above conditions, it is basically possible to guess the internal leakage. First clean the cavity, then pass the cooling water, and carefully check whether the water pipeline has wet points. The wet points are the leakage points. The ionization tube can be used to detect the leakage by being sensitive to some gases under high vacuum, such as or ethanol, Use a medical syringe to spray or ethanol into the suspected area.
Combined with the pointer vacuum gauge, the pointer of the ionization gauge will swing significantly when it is sprayed to the leakage point. In this way, you must be patient to detect the leakage. Wait until the indication of the ionization gauge is stable, that is, the extraction capacity and leakage rate of the vacuum unit are balanced, then erupt, repeat several times, recognize the leakage point, and pay attention to several links in repair, disassembly, cleaning, inspection and installation, It is important that vacuum equipment, large or small, be attributed to precision mechanical equipment.

How to confirm the oil level of 2X-70A rotary vane vacuum pump

The main causes of high working noise of vacuum pump

Vacuum pump is one of the major noise sources affecting vehicle idle speed noise. In order to suppress this noise source and reduce the working noise of vacuum pump, the mounting bracket and rubber pad are abstracted as the spring series model of bracket vibration isolation rubber block bracket, and the influence of the vibration isolation system composed of mounting bracket and vibration reduction rubber block on the vibration transmission of vacuum pump during operation is further analyzed, When the vacuum pump works, the mounting bracket produces strong high-frequency vibration, and the vibration of the bracket causes large structural noise at the body connection, which is the main reason for the large working noise of the vacuum pump
Secondly, the sealing condition of the whole vehicle is poor. After checking the sealing performance of the whole vehicle, it is found that:
1) There are no sound insulation and sealing measures for the engine compartment cover between the extended range engine compartment and the cab, and the noise generated during the operation of the vacuum pump is directly transmitted to the vehicle through the air;
2) There are many useless holes in the front compartment, middle passage, upper part of wheel side motor of rear axle and seat floor in the vehicle, which are not filled. In addition, the openings of steering gear, heating and air conditioning in passenger area and front wall harness are not sealed, and the vehicle is directly connected with the outside world;
3) The installation clearance between the cab door and the sliding door in the middle of the carriage is large, and the door is still connected with the outside after being closed. As shown in Figure 7, the poor sealing of the whole vehicle will reduce the sound insulation effect of the vehicle, and too much noise generated during the operation of the vacuum pump will be transmitted to the vehicle through the air, resulting in large interior noise

2BE series liquid ring vacuum pump in inlet/outlet compensator

Is the vacuum pump after maintenance so different?

At present, some customers are not very clear about the maintenance of the vacuum pump, mainly focusing on the simple replacement of three filters and one oil, thus ignoring other maintenance. The efficient and energy-saving operation of the vacuum pump provides a strong guarantee for production and is inseparable from correct maintenance. Therefore, in addition to the normal maintenance of three filters and one oil, attention should also be paid to the maintenance of the motor and valve parts of the vacuum pump.
#Maintenance of motor
The motor runs every 4000 hours or once a year, whichever comes first, and special high-temperature grease needs to be added (Atlas Copco motor high-temperature grease part No. 2901033803). The motor speed of the vacuum pump is very high. For a commonly used pump, the Z high speed of GHS 900 VSD + is close to 5600 rpm, which is nearly twice as fast as that of the air compressor with the same power of 22KW. Therefore, it is necessary to pay attention to the lubrication of motor bearings. If the motor grease with the wrong model is not added for a long time, it is easy to cause poor lubrication of the motor and damage the motor in serious cases.
The bearing of the vacuum pump on the customer's site was damaged and the motor was burnt out due to neglect of the maintenance of the motor. It is suggested that the motor grease filling gun Z of the vacuum pump should be dedicated to avoid mixing with the filling gun used by other different equipment using different types of motor grease.
In addition, the motor needs to be overhauled every 24000 hours to avoid sudden damage to the motor and greater loss due to the service life of the motor bearing.
#Maintenance of temperature control valve
The main function of the temperature control valve is to control the oil temperature and prevent the oil temperature from being too high and too low. If the oil temperature is too low, it will not only affect the lubrication efficiency of the system, but also have the risk of condensate precipitation, which will accelerate the emulsification of vacuum pump lubricating oil and bring risks to the normal operation of the equipment. If the oil temperature is too high, it will accelerate the aging and deterioration of the lubricating oil of the vacuum pump, increase the oil change frequency of customers, bring more maintenance costs and affect the service life of the equipment.

Explosion proof and high temperature resistant vacuum unit

Is there a relationship between the price and service life of oil-free vacuum pump?

When shopping, ordinary consumers often feel that the price is higher and the service life will be longer. In a sense, the service cycle of purchasing mechanical products has a certain relationship with the price. Especially for products with guaranteed after-sales service, the service life will be relatively long. Of course, in the process of consumer choice, in addition to the price, don't easily ignore some principled things. After all, ignoring the principle will not help their choice much.
Is there a relationship between the price and service life of oil-free vacuum pump? If the price is relatively high under the same conditions, the overall quality should be relatively good. When the quality is good, the service life will be relatively prolonged. If the improper use in the process of use leads to bad effects, it will eventually affect the service life. It is suggested that consumers should not easily ignore some principled things. After all, their own methods will also play a certain role.
No consumer is completely indifferent to the price when buying products. Even if they have a large budget, they certainly want to choose products with absolute cost performance. The price of oil-free vacuum pump is affected by many factors. When choosing, you must choose products with a relatively long service life. After all, if you analyze them from a long-term perspective, it will be very helpful for your own application. There are also some relatively cheap products in the market, but they will not have a long service life after purchase, and even need to be repaired after use for a period of time.
In the process of purchasing products, many detailed problems should not be easily ignored, and the final judgment should not be affected by a little cost. There will be a certain correlation between the service life and price of the product, but only by truly comparing the goods, it is possible to choose the most appropriate product. When comparing, we should adhere to a very rational comparison standard, and we can't rely solely on our own subjective assumptions. Many problems only know what's going on after real experience. It is suggested that consumers must adhere to relatively rational purchase thinking when choosing.

What are the applications of roots vacuum units in medicine? 

The development of vacuum pump industry has been stable for a long time

China's apparent consumption of vacuum pumps has reached a level close to 1 / 4 of the global total consumption, and the per capita consumption of stainless steel has reached 3.4kg, leaping to the forefront of developing countries. Stainless steel pump has excellent characteristics such as corrosion resistance, high strength, portability and long service life. In recent years, stainless steel pumps are widely used in shipbuilding, rail vehicles and other transportation industries. Let's get to know each other.
With the development of machinery manufacturing industry, stainless steel pump will have a broader application prospect. However, the growth rate of consumption has gradually slowed down, from the rapid development stage with an average annual growth rate of more than 30% to the steady development stage with a current growth rate of 6.43%.
Although the development of the vacuum pump industry has been relatively stable for a long time, its competition is still not standardized. There are mainly the following problems: first, some operators buy Valves with manufacturer's name and address, or print the certificate of well-known manufacturers, which misleads consumers and seriously endangers the reputation of qualified valve enterprises. Second, some operators carry out secondary sales after refurbishing and repainting waste valves, which brings serious potential safety hazards to the project quality and seriously disrupts the order of the valve market.
I believe many customers already know about the vacuum pump. If there is anything you don't know, you can learn from our website at any time, or call our hotline to learn more about it. We will explain it clearly for you.

2BE1-153 Liquid Ring Vacuum Pump used in Plastic extrusion industry  

How to prevent reverse rotation of water ring vacuum pump

What happens when the water ring vacuum pump reverses and how to prevent it
This is a schematic diagram of a water ring vacuum pump

We can see from the picture; Suppose it is a reverse case;
1. The inlet and exhaust ends will be reversed. Due to the bending direction of the impeller, the inlet end will exhaust and drain slightly, and the exhaust end will intake slightly, but it will not achieve its rated effect.
2. If it operates for a long time, it is possible to turn negative pressure into positive pressure, but there will be no vacuum.
3. In addition to the impeller, the water ring pump also has a very important thing, the valve plate. When the water pump reverses, the valve plate loses its function.
4. As for any damage, the problem is not big, and the impeller bolts may be loose.
Prevent reverse rotation. In order not to loosen the lock nut on the rotor, it is recommended that you disconnect the coupling and test the motor.

After reversing, you will not be able to exhaust, and your suction vacuum will be very low or not. As long as the motor is not connected to the wrong line, it is impossible to turn over.

Paperex , World’s Largest Paper Show( India,Delhi- NCR) in 2022 

Clarify 3 problems before vacuum measurement

 

First of all, we should have a more comprehensive understanding of all aspects of the tested object.
It mainly includes: the properties of the tested object, whether it is condensable gas or non condensable gas, whether it is single or mixed, inert gas or active gas or corrosive gas; Whether the air flow state is steady or instantaneous, whether it is uniform or non-uniform; Whether the temperature is isothermal or non isothermal, high temperature or low temperature; Whether there are special conditions such as magnetic field, electric field, vibration, impact, acceleration, charged particles, radiation, etc.
Secondly, according to the situation of the tested object and the research purpose, correctly select the vacuum gauge, and need to understand the principle, range and limitations of the selected vacuum gauge, so as to use the vacuum gauge correctly.
Third, we should understand the interaction between the vacuum gauge and the measured object.
The principles of various vacuum gauges are different, and its introduction may cause changes in some states of the measured object; At the same time, the gas in the measured object may also affect the vacuum gauge, change its performance and interfere with its work.
Moreover, when introducing the technical characteristics of vacuum measurement, fozhen has mentioned that the measurement accuracy of vacuum measurement is not high due to many influencing factors and difficult to control. Therefore, in order to carry out ideal vacuum measurement, we must fully understand the above-mentioned problems, so as not to cause greater errors or errors.

Vacuum pump and vacuum generator are widely used in pharmaceutical and food industry  

The sealing between the vacuum pump and the system shall be reliable

The vacuum pump shall be able to discharge all steam volume caused by the whole process of vacuum technology processing process under its pressure. Properly constitute the vacuum pump. Because the vacuum pump has optional vacuum pumping, even if a certain pump is selected, the vacuum pumping regulations cannot be considered. Multiple pumps must be formed to fill each other to consider the vacuum pumping regulations. For example, the titanium lift pump has a high pump efficiency for hydrogen, but can not pump helium, while the three pole magnetron sputtering ion pump (or the two pole asymmetric encrypted negative magnetron sputtering ion pump) has a certain pump efficiency for argon. If the two are combined, the vacuum pump equipment will obtain a good vacuum value.
Vacuum pump
When the vacuum pump cannot work under atmospheric pressure, the vacuum pump must be prepared for treatment. The inlet and outlet working pressure of the vacuum pump is less than atmospheric pressure, so the front pump must be used, so it must form an application pump. Provisions of vacuum technology on oil environmental pollution. If the machinery and equipment are strictly managed without oil stains, various gasoline free pumps should be selected, such as water ring pump, carbon molecular sieve suction pump, magnetron sputtering ion pump, cryogenic pump, etc. If the regulations are not strict, you can choose an oil vacuum pump, plus some anti oil environmental pollution countermeasures, or cold trap, baffle, oil trap, etc., you can also clean up the regulations of the vacuum pump.
The vacuum pump shall be installed in a solid place on the ground, with sufficient indoor space nearby, which is conducive to inspection, maintenance and repair. The subgrade engineering level shall be maintained under the vacuum pump base. It is recommended to pad damping rubber or cast and install with anchor screws at the four corners of the base to ensure that the vacuum pump operates stably and has little vibration.
The connecting pipeline between the vacuum pump and the system software shall have reliable sealing performance. For small vacuum pumps, metal hose can be used, and acid and alkali resistant vulcanized rubber can be used as the connecting gasket. For small vacuum pumps, vacuum pump rubber hose can be used for connection. The pipeline shall not be lower than the breathing specification of the vacuum pump, and the specified pipeline shall be short and less bends. (when welding steel pipe, the welding slag in the pipeline shall be eliminated, and it is forbidden to penetrate into the vacuum pump chamber.)

Liquid Ring Vacuum Pumps Used in Sugar Mill 

What if the vacuum pump make-up solenoid valve cannot be opened

 Vacuum pump refers to the components or machinery and equipment that vacuum the evacuated vessels by means of mechanical equipment, physics, organic chemistry or physics. In terms of popularization, vacuum pump is the equipment that improves, creates and maintains vacuum pump in a closed in various ways.

Vacuum pump
The structure inside the vacuum pump of the vacuum pump manufacturer is very simple, but the installation gap is small. When the gap between the centrifugal impeller plan and the disc plan is maintained at 0.2mm, the vacuum pump can be caused normally. When the gap between the disc and the centrifugal impeller is too large, the vacuum value of the vacuum pump will be reduced or there will be no vacuum value. If the gap is too long, the operation of the motor is laborious and it is very easy to damage the motor. The water ring vacuum pump of the vacuum pump manufacturer uses tap water as cutting fluid, which is low-cost. Because the water bodies in various regions are different, some water bodies are hard. After the vacuum pump is used for a period of time, it is very easy to cause dirt in the pump (the same as the milky dirt in the boiling teapot). The gap between the disc and the centrifugal impeller becomes small, and the dirt in the pump is not eliminated at this moment, The motor runs hard and is very easy to damage the motor or crush the centrifugal impeller. The treatment method is to add the boiler descaling agent to the pump (it is not necessary to disassemble the pump). After 20 minutes, clean it with cold water. Pay attention not to discharge the boiler descaling agent into the cold circulating water of the vacuum pump. If it is difficult to buy boiler descaling agent, dilute hydrochloric acid can be used to solve it. Sulfuric acid has slight corrosion on the pump, which is not better than using boiler descaling agent.
The water replenishing and moisturizing relay of the vacuum pump gas-liquid separator of the vacuum pump manufacturer can not be opened normally. The bypass valve must be manually opened to replenish water and moisturize the separation equipment. After on-the-spot inspection, it was found that the floating ball level gauge of the water pump pressure switch installed in the separation equipment was full of dirt, resulting in the magnetic induction switch can not be in all normal positions. As a result, when the separation equipment is in the low level instrument, the PLC did not receive the data signal of the low level instrument and sent out the instruction to open the water replenishment and humidity protection relay, so that the relay can be opened automatically.

Oil Vapor Booster Vacuum Pump used in Short Path Distillation progress

Reasons for the decrease of outlet pressure of centrifugal pump

(1) Motor reverse
Due to wiring, the steering of the motor will be opposite to the actual required steering of the centrifugal pump. Generally, observe the steering of the pump when starting. If the steering direction is opposite, replace any two wires on the motor terminal.
(2) The working point moves to high flow and low head
Generally speaking, the centrifugal pump has a continuous downward performance curve, and the flow increases gradually with the decrease of head. During operation, due to some reason, the back pressure of the pump decreases, and the working point of the pump passively moves to the low head point flow with the curve of the device, which will lead to the reduction of head. In fact, this is caused by external factors such as changes in equipment, which has no special relationship with the pump itself. At this time, as long as the back pressure of the pump increases, such as closing the outlet valve a little. The problem can be solved.
(3) Slow down
The important factors affecting the pump head of centrifugal pump are impeller outer diameter and pump speed. When other conditions remain unchanged, the pump head is directly proportional to the quadratic power of speed. It can be seen that the speed has a great influence on the pump head. Sometimes, if the speed of the pump is reduced due to some external reason, the pump head will be reduced accordingly. At this time, check the speed of the pump. If the speed is not enough, check the cause and solve it reasonably.
(4) Cavitation at inlet
If the suction pressure of the centrifugal pump is too low and lower than the saturated vapor pressure of the pumped medium, cavitation will be formed. At this time, check whether the inlet pipeline system is blocked, or whether the opening of the inlet valve is too small, or raise the liquid level of the suction tank.
(5) Internal leakage
When the gap between the rotating part and the stationary part of the centrifugal pump exceeds the design range, internal leakage will occur, which is reflected in the decrease of the discharge pressure of the pump, such as the gap between the impeller port ring and the interstage gap of multi-stage pump. At this time, corresponding disassembly and inspection shall be carried out to repair or replace the parts causing excessive clearance.
(6) Impeller passage blocked
If part of the flow passage of the impeller is blocked, the operation of the impeller will be affected and the outlet pressure will drop. Therefore, it is necessary to disassemble the pump to check and remove foreign matters. In order to prevent this problem from happening again, if necessary, a filtering device can be added in front of the inlet of the centrifugal pump.

roots vacuum pump of vacuum water diversion steps 

Replace the filter element of stainless steel vacuum pump

 

What role can the filter element play in the whole vacuum pump? The main purpose is to filter the impurities in the air, so as to maintain the vacuum in a clean state and facilitate the cleaning of the interior of the equipment. Since the filter element often filters various types of impurities and the dust has strong adhesion, it is necessary to replace the filter element regularly. How to replace the filter element of stainless steel vacuum pump? Just follow these steps.
1. Use method, maintenance and replacement time of stainless steel vacuum pump filter element in order to ensure product quality and maintain the safe operation of production equipment, the replacement of pump filter element shall be completed in detail step by step. Production operators shall record and supervise the replacement process. After receiving the production order to replace the pump filter element, first confirm that the system stops running, prepare a suitable spare filter element, check whether the filter element specification, material, size, O-ring material, model and other data are normal, and prepare disassembly tools, collection barrels, rags and other tools.
2. Clean the pump filter element housing, empty the periphery of the filter and leave the operation area. Wear protective equipment. Disconnect the filter that needs to be replaced from the system. Slowly open the exhaust port on the top of the filter to release the pressure, pay attention to the safety in the process, prevent material or liquid splashing, empty the material in the filter, open the filter cover with tools, take out the filter element, pack the filter element in plastic bags for scrapping, clean the inside of the filter with cleaning tools and cloth, and install a new filter element.
3. Open the plastic bag at the open end of the filter element of the stainless steel vacuum pump, check whether the O-ring is intact and in place, and install the material by flowing in from the outside of the filter element and flowing out from the inside of the filter element; Wet the O-ring and the socket of the filter element base with a suitable wetting agent, hold the end of the filter element close to the O-ring, insert the socket of the filter element completely vertically into the socket of the filter element base, insert the pump filter element, remove the filter element packaging bag, then install the metal cover and tighten the filter with tools; Close the discharge port of the filter, open the vent valve on the top of the housing, slightly open the inlet valve, let the material enter the housing until the liquid overflows from the vent valve on the top of the housing, and then close the vent valve. Pay attention to check whether there is leakage at the disassembly position, and slowly open the filter outlet valve until it is fully opened. Indicates that the replacement has been completed.
4. Pay special attention when replacing the filter element of vacuum pump: prevent pressure impact and prohibit reverse pressurization. When the pressure drop between upstream and downstream of the filter is greater than 0.3 MPa or the flow decreases significantly, the pump filter element shall be considered to be replaced. When installing the filter element, pay attention to the installation direction of the filter element, from the outside to the inside.
When replacing the filter element of stainless steel vacuum pump, pay attention to the installation position of the filter element. Only in the proper position can the installation effect of the filter element be guaranteed and the impurities can be effectively filtered out. At the same time, the filter element must be replaced regularly.

Roots Screw Dry Vacuum Unit In Practical Application Of Performance

Precautions for switching on and off roots vacuum pump

In fact, if the roots vacuum pump is switched on and off in an incorrect way, it will have a great loss impact on the roots pump equipment. For a long time, it will seriously affect the normal use of the equipment and even reduce the service life of the equipment. Therefore, you must pay attention to some relevant matters when switching on and off roots pump equipment to avoid wrong operation, such as:
1. Power on. Roots vacuum pumps are generally used in conjunction with the previous stage pumps. Except for multistage, wet and air-cooled Roots pumps, equipment damage caused by excessive differential pressure shall be avoided. Therefore, before starting the roots pump, start the front stage pump, open the valve on the pre pumping pipeline of the front stage pump and the inlet and exhaust valve of the roots pump, close the valve on the pre pumping pipeline after the pressure in the system reaches the allowable inlet pressure of the roots pump, and then start the roots pump.
2. Shutdown shutdown. First, close the air ballast valve of the front stage oil seal mechanical pump, then close the inlet valve of Roots vacuum pump, and then stop roots pump first and then the front stage pump. Do not mistake the shutdown procedure. While stopping the front stage pump, immediately vent the air at the air inlet of the front stage pump and close the cooling water inlet valve.
Therefore, it is necessary to operate according to the correct mode of switching on and off, and pay more attention not to make mistakes in the operation steps of switching on and off, otherwise the wrong operation sequence will not only lead to the failure of switching on and off, but also have a great adverse impact on Roots vacuum pump. And Xiaobian suggests that you can take relevant maintenance measures after each use of roots pump equipment, so as to prolong its service life.

heat treatment of vacuum pump for precautions 

Scaling of vacuum pump unit and Revelation of preventive measures

Scaling is often found in the use of vacuum pump unit. The scaling of vacuum pump unit is caused by the influence of water quality and operating temperature. In the face of this phenomenon, we should carry out scaling treatment in time. Here are the measures to prevent scaling of vacuum pump unit.
1、 Wash the pump body of vacuum pump unit regularly
The pump body drainage gate valve can be used to drain the accumulated water in the pump normally. During operation, the water pressure of the pump body can be used to wash the dirt and water slag in the pump regularly. On the one hand, it can prevent the dirt from accumulating, on the other hand, it can also prevent the water slag from converting into scale, resulting in the scaling of the vacuum pump unit.
2、 Hardness of circulating cooling water
1. Most of the circulating water systems are open circulating systems with high return rate.
2. When ion exchange equipment is not used for water treatment, a water storage tank and a high-level water tank are generally used to supply water to the unit. Managing the water quality according to the water quality standard of hot water boiler can prevent scaling and corrosion of vacuum pump unit.
3、 Temperature control of circulating cooling water
1. The difference between the water temperature in the vacuum unit and the water temperature in the storage tank is an important factor leading to scaling. Therefore, during the operation of circulating cooling water, the return water temperature and return water volume of the pump shall be monitored to ensure that the normal water supply and return water temperature of each pump shall not exceed 40 ℃.
2. The water supply can be controlled by valves. If the return water temperature exceeds the regulations, supplement low-temperature cold water or use other cooling methods to reduce the temperature of the water in the water storage. Increasing the circulating water supply and improving the cooling effect is an important guarantee to limit the scaling speed of the vacuum pump unit.

Liquid Ring Vacuum Pumps Used in Steel Foundry in Mexico 

How to confirm the initial state of Roots vacuum pump

 Whether it is the product of life or machinery, it can not exist in a state form in this life. The state is always changing at any time. When we determine the use state of the equipment, we can better control it. After the initial state of Roots vacuum pump is confirmed, our next work can be carried out well.

The roots vacuum pump is equipped with an eccentric rotor with fixed blades to throw water (liquid) to the stator wall. The water (liquid) forms a liquid ring concentric with the stator. The liquid ring and the rotor blades form a rotary variable volume vacuum pump with variable volume.
The roots vacuum pump is in the state of no process medium. Confirm that the coupling is installed, the protective cover is installed, the mechanical, electrical and instrument of the roots vacuum pump are confirmed, the pump turning is uniform and flexible, the inlet filter is cleaned and installed, confirm that the cooling water is led to the pump, confirm whether the lubricating grease is qualified, confirm that the lubricating grease of the bearing box has been filled, and confirm that the inlet and outlet valves of the pump are closed, Confirm the state of the pump motor switch and whether the pump motor is powered off.
It can be seen that these confirmations can actually be a form of inspection. The above confirmations are related to the roots vacuum pump in many places, so that we can better ensure the development of our work.

SV300 Rotary Vacuum Pump Used In pharmaceutical industry In Peru 

Measures to prevent oil return of vacuum pump

With the continuous development of modern industrialization, we use vacuum pumps more and more frequently. Oil return often occurs during use, which has also caused some troubles to our enterprise's development and production. Next, I will analyze the measures to prevent oil return of vacuum pump:
1. The static sealing part of shaft seal shall be firm and replaced in time.
2. Move the oil tank and exhaust valve to the side to reduce the oil level and reduce the amount of oil.
3. The plane of the vacuum pump base shall be flat, and the valve plate shall be elastic.
4. Separate the oil near the exhaust valve from other oil, and the oil level is only slightly higher than the partition wall.
5. Add a pipe into the oil hole so that the oil level is only slightly higher than the oil inlet.
6. The check valve mechanism of the vacuum pump is set to automatically close the oil inlet hole when the pump is stopped.
7. Set the oil pump and auxiliary mechanism to cut off the oil circuit when the pump is stopped.
8. Its pump port is equipped with an inflation valve.
For the above small series, we provide measures to prevent the oil return phenomenon of vacuum pump. In the ordinary actual operation and use, doing these work well can effectively avoid the oil return phenomenon and ensure its normal operation.

Dry screw vacuum pump for pure vacuum process 

Domestic vacuum pump replacing import is becoming a trend

 

At present, the dry vacuum pump is still in its infancy in China, and domestic substitution for import will become a trend in the future. Dry vacuum pump will have a great effect on the yield of the process. It is also a trend for dry pump to replace the existing water pump and oil pump.
During the maintenance of the vacuum pump, it is found that the pump is full of water. Under normal circumstances, the pump should be oil. While vacuumizing, the pump also pumps water into the pump, resulting in a large number of oil-water compounds. When the pump is working, the presence of a large amount of water increases the load of the pump, and the pump will have problems in the long run.
The vacuum drying oven has requirements for the materials to be dried. One is that it cannot contain a large amount of water, and the other is that it cannot contain organic compounds. They will be pumped into the body while vacuumizing, resulting in a series of adverse reactions and affecting the service life of the pump. If the material contains water or organic solvent, liquid water filter and condenser must be added to play a filtering role. While using the vacuum drying oven, we must also strengthen the maintenance of the vacuum pump, timely change the oil for the vacuum pump and prolong its service life.

The 13th Shanghai International Chemical Pump、Valve & Pipeline Fair 

Pneumatic diaphragm pump accessories

Pneumatic diaphragm pump is a new type of conveying machinery, which is a kind of pump in China. Compressed air is used as the power source. It can be used for all kinds of corrosive liquids. The pneumatic diaphragm pump has four materials: engineering plastic, aluminum alloy, stainless steel, cast iron and fluorine lining. No matter what material the pump is made of, the pneumatic diaphragm accessories will be damaged and need to be replaced. What are the pneumatic diaphragm pump accessories and what is the name of the pneumatic diaphragm pump accessories? The following is a detailed description of Longyang pump valve according to the physical drawing of pneumatic diaphragm pump accessories.
It can be seen from the above table that the accessories of pneumatic diaphragm pump mainly include: diaphragm, sealing ball, sealing seat, auxiliary shaft sealing ring, auxiliary sliding block, piston, piston sleeve, connecting rod shaft, sliding block, sliding plate, cover plate gasket, O-ring, y-o-ring, butterfly O-ring, etc. Let's see what they look like through the physical drawing of pneumatic diaphragm pump accessories, so as to facilitate our later purchase. Here we recommend you to take a look at the use method of pneumatic diaphragm pump to help the service life of pneumatic diaphragm pump accessories.
The above is the detailed description of the accessories name of the pneumatic diaphragm pump and the accessories drawing of the pneumatic diaphragm pump. When the diaphragm pump is used to a certain extent, we need to replace its accessories and vulnerable parts, especially the diaphragm plate needs to be inspected or replaced regularly. The pneumatic diaphragm pump is equipped with 2 F46 diaphragms and 2 mountain rubber diaphragms, which are replaced at the same time, This helps to improve the working efficiency of the diaphragm pump.

Roots - Piston Vacuum Pump Package Used In Fruit freeze dryer 

Noise transmission path of brake vacuum pump

 Vehicle NVH performance mainly refers to the noise, vibration and discomfort directly felt by the drivers and passengers in the vehicle during driving, also known as sound vibration roughness. Vibration and noise are often inseparable and occur at the same time. Excessive vibration will cause damage to the engine and vehicle parts; Noise is generally caused by vibration, which not only pollutes the environment, but also makes drivers and passengers tired; Acoustic vibration roughness refers to the discomfort directly felt by the drivers and passengers by the vibration and noise in the vehicle. The vibration in the vehicle mainly refers to the vibration generated during the operation of the engine and its accessories and power transmission system and the vibration generated by road excitation, which is transmitted to the steering wheel through the tire, suspension and suspension system through the frame and body The floor and seats are perceived by the personnel in the vehicle. The noise in the vehicle mainly comes from two aspects:

First, the combustion noise and mechanical noise generated during the operation of the engine and its accessories, the friction noise and wind excitation noise between the tire and the ground during rolling are transmitted to the vehicle through the air medium;
The second is the structural noise induced by the vibration generated by the chassis, body and other structural parts due to the excitation of the engine powertrain and uneven road surface. The noise generated during the operation of the brake vacuum pump is directly transmitted by the solid, transmitted to the body through the engine compartment, radiated to the vehicle through the structure, and perceived by the personnel in the vehicle. After stepping on the brake pedal in the state of low-voltage power supply, When the brake vacuum pump starts to work, the working noise generated by the vacuum pump is large, and the inflation noise of the vacuum pump can be clearly heard in the vehicle

high-vacuum flapper valve Used In extracting the CO2 Application 

If you want to use vacuum pump oil better, you must understand this knowledge

 

1. The oil loading window must be dirty and pickled. It is strictly prohibited to be exposed to the sun and stored in the open air. It should be stored in dark, dry and ventilated places to prevent the mixing of water and dirt.
2. When taking or loading oil, the drizzle around the barrel cover must be removed to prevent sundries from mixing into the oil and causing wear of the pump.
3. On the contrary, the vacuum pump oil of different brands and types shall not be mixed, and the old and new bamboo weaving shall not be mixed.
4. The vacuum pump shall be full capacity to prevent the extraction of solvent, steam and corrosive gas. It must be checked and changed frequently when it is used.
5. It is lenient to prevent vacuum oil from mixing with other smooth oil, and not to mix with light bamboo weaving. Whether it will be unnecessary to have vacuum performance.
6. When changing the oil, drain all the bamboo woven used in the pump body, pour in the new oil, slowly rotate the pump shaft, sweep the pump cavity, drain the residual oil, wash it repeatedly for several times, and replace it with new oil after cleaning.
7. When mineral oil is exchanged with ester oil or other decomposed oil, the pump shall be disassembled for bottom cleaning. All components must be immersed in ester oil to prevent purification.
8. The refueling appliance must be equipped with facilities and should not be a container containing other bamboo or solvents; Pump.
9. When overhauling the pump, be sure to clean and marinate all components of the pump with solvent or detergent, and dry the components.
10. If chemical gas and solvent are inhaled and vacuum is not necessary for pump oil purification, it must be cleaned and replaced.
11. During oil change: A. when the vacuum of pump oil falls and cannot meet the needs; b. When the pump oil becomes dark and brown, the oil should be changed.

Do you know the role of dry screw vacuum pump in gasoline industry ?

Pollution free and efficient vacuum, pharmaceutical enterprises prefer screw vacuum pump

 

Vacuum distillation is a vacuum process often used in various chemical, pharmaceutical and petrochemical enterprises. At present, more and more enterprises fall in love with screw vacuum pumps in the process of selecting vacuum pumps for vacuum distillation, from chemical enterprises to various pharmaceutical enterprises. Recently, a well-known domestic pharmaceutical enterprise added another 18.5kw dry screw vacuum pump for vacuum distillation.
With the improvement of social quality requirements for various industries, product defects will be amplified and the tolerance will be lower and lower. This is especially true for pharmaceutical products. Therefore, in vacuum distillation, in order to improve the distillation efficiency and improve the quality of distillation products, more and more pharmaceutical enterprises no longer pay attention to the pumping speed and vacuum degree, but also pay attention to the improvement of product quality by clean vacuum in the process of vacuum pump selection.
The working range of dry screw vacuum pump is from atmospheric pressure to about 1pA extreme vacuum. It has a wide range of large pumping speed. A single pump with low vacuum can achieve high pumping speed. It has simple and reliable structure and convenient maintenance and operation. On the other hand, due to the inherent cleaning characteristics of screw vacuum pump, there is no need for other media to participate in the extraction process, and there is no need to worry about backflow polluting media. Moreover, it can be combined with roots to form a dry vacuum unit product with clean, high vacuum degree and large pumping speed. In food, fine chemicals, pharmaceutical semiconductors and other fields with strong demand for clean vacuum and various recycling fields, these characteristics can effectively improve the production efficiency of enterprises, greatly simplify the operation process and various supporting links of vacuum system, and improve the product quality. Therefore, they are favored by enterprises.

Liquid Ring Vacuum Pumps Used in Paper Mill in Bengal

Do you know the maintenance of oil-free screw vacuum pump

 Oil free screw vacuum pump has become one of the most widely used vacuum pumps in the market. It is welcomed by the public because of its characteristics of no oil fume, light weight and no pollution. However, many people do not know how to maintain it. The following small series will give you a popular science about the maintenance of oil-free screw vacuum pump.

1. There shall be sufficient and good ventilation conditions and ambient temperature below 40 ℃.
2. Clean the workplace without dust and dirt.
3. Water, oil and other liquids will not fall on the pump.
4. Not directly exposed to the sun.
5. There is enough surrounding space to facilitate the inspection, maintenance, assembly and disassembly of the pump.
6. The pump must be installed on a flat surface.
7. Install the pump on a hard concrete foundation. If there is no equipment, it can be installed on a steel frame or wooden frame.
8. It must be able to ensure that the pump does not vibrate due to the weak economic foundation.
9. The pipeline connected with the pump should not be too long or smaller than the pump inlet diameter, which will affect the pumping speed. At the same time, it is necessary to pay attention to safety and check the vacuum connection and whether the pipeline has air leakage.
10. When wiring, pay attention to the wiring requirements on the motor nameplate. Pay attention to the rotation direction of the motor for the three-phase electric pump, which shall be consistent with the direction of the arrow on the pump.
The above is about the maintenance of oil-free screw vacuum pump. I believe you will understand it after reading it. You should pay attention to these situations in your daily work to avoid accidents.

Liquid Ring Vacuum Pumps Used in Paper Mill in Bengal

Reasons for sudden non operation of water ring vacuum pump

Generally speaking, the water ring vacuum pump in normal operation will not have any problems, but this is not allowed. Sometimes, the pump in normal operation will suddenly stop running, and this situation is not caused for no reason. There are still many reasons:
1. The power failure may also be the reason why the water ring vacuum pump suddenly does not run. First check its power supply to see if it is powered off, eliminate the fault in time and restore the power supply.
2. The reason why the water ring vacuum pump suddenly does not run may be that the control protection switch of the vacuum pump trips. The main reason for the control protection switch tripping is that the vacuum pump is damaged during operation or due to overload of the vacuum pump motor. The treatment method for the sudden non rotation of the vacuum pump is to measure the insulation resistance of the vacuum pump motor first, and check whether the stator winding of the vacuum pump motor is damaged and whether other parts are damaged.
3. The broken core wire of the power supply cable of the water ring vacuum pump may also be the reason for the sudden non rotation of the vacuum pump. The treatment method for the sudden non rotation of the vacuum pump is to connect the broken core wire of the motor power supply cable and wrap it with insulating tape. If the connection repaired after the power supply cable is broken needs to be immersed in water, the cable shall be treated or replaced according to the waterproof connection and sealing requirements of the cable joint.
4. The action of the thermal protector of the water ring vacuum pump may also be the reason for the sudden non rotation of the vacuum pump: the main reason for the action of the thermal protector of the vacuum pump is the overload of the vacuum pump or the poor heat dissipation or dehydration operation of the vacuum pump motor; Or it is caused by malfunction of thermal protector. The treatment method is to check the cause of the action of the thermal protector and eliminate it, waiting for its automatic reset or repair and adjustment.
5. The stator winding of the water ring vacuum pump is burnt out, which may also be the cause of the sudden non rotation of the vacuum pump. If it is found that the stator winding of the vacuum pump is burnt out, first check the cause of the damage of the stator winding and eliminate the fault to prevent the motor stator winding from being damaged again; Then disassemble and repair the motor stator winding and replace the damaged stator winding as required.
7. There may also be the reason why the motor is burnt out due to water ingress caused by medium corrosion. The liquid is corrosive. It is recommended to use stainless steel.
Therefore, once the water ring vacuum pump used by everyone has such a situation, what to do is always careful and careful inspection. The inspection results determine which way we will choose to deal with it, so that we can continue to use the vacuum pump.

LGB220 Dry screw vacuum pump Used In Chemical plant In Thailand

Function of dry vacuum pump

In the process of expanding the development advantages of enterprise productivity, we should constantly improve the advantages of the actual performance of dry vacuum pump products and speed up its application effect. The overall driving force of its product application and practical ability is to continuously improve the overall development of its product strength, and improve the application efficiency of the equipment through comprehensive driving product advantages.
Therefore, its performance capability in all aspects is continuously improved, and its practical advantages are brought into full play, so as to enhance the embodiment of its product strength and further improve the comprehensive performance of its products
Improve product application and performance advantages. Give full play to the quality and strength of dry vacuum pump, accelerate the embodiment of its product performance and superior ability, and use advanced equipment to expand the development of enterprise productivity. Continuously display and expand the practicability and quality strength of products, improve their overall application value strength with efficient product utilization effect, so as to improve the superiority of product strength with reliable quality and effectiveness, and fully improve the quality strength of product use and sustainable development.
In order to speed up the development of enterprises and improve the performance of dry vacuum pumps, we should speed up the application and practice of products with various advantages. The improvement of performance advantage level promotes the overall improvement of enterprise quality and strength, and enhances the quality and performance of enterprises through reliable strength utilization.
Now, you can see that there are so many different designs of dry vacuum pumps, each with its own characteristics, advantages and disadvantages.
Application cost has always been an important factor affecting people's selection of vacuum pump. More and more vacuum pump users realize that the stability of vacuum pump should also be taken into account. Due to the accidental wrong solution of the vacuum pump, the application efficiency of the machine is reduced, which affects the production and delivery of wafers, and even the processing damage of wafer waste and other parts. Because the screw design adopts single-stage design, the number of parts used can be reduced by up to 60% compared with multi-stage pumps (such as ball joint, claw and combination). This is a great advantage for stability and future protection costs.
In general, if the user thinks that power consumption is very important to him, selecting an internal compression screw may be a good choice, and the nitrogen content is not important to him. However, in general, the requirements for tail gas treatment are becoming more and more stringent, so it is particularly important to reduce the amount of nitrogen used in the future. If you want to handle a wide range of semiconductor processes without changing them with a simple inventory control pump, external compression screws are a good choice.

Water Ring Vacuum Pumps Used In Vacuum Drying Of Vegetable And Fruit 

Reasons for sudden non operation of water ring vacuum pump

Generally speaking, the water ring vacuum pump in normal operation will not have any problems, but this is not allowed. Sometimes, the pump in normal operation will suddenly stop running, and this situation is not caused for no reason. There are still many reasons:
1. The power failure may also be the reason why the water ring vacuum pump suddenly does not run. First check its power supply to see if it is powered off, eliminate the fault in time and restore the power supply.
2. The reason why the water ring vacuum pump suddenly does not run may be that the control protection switch of the vacuum pump trips. The main reason for the control protection switch tripping is that the vacuum pump is damaged during operation or due to overload of the vacuum pump motor. The treatment method for the sudden non rotation of the vacuum pump is to measure the insulation resistance of the vacuum pump motor first, and check whether the stator winding of the vacuum pump motor is damaged and whether other parts are damaged.
3. The broken core wire of the power supply cable of the water ring vacuum pump may also be the reason for the sudden non rotation of the vacuum pump. The treatment method for the sudden non rotation of the vacuum pump is to connect the broken core wire of the motor power supply cable and wrap it with insulating tape. If the connection repaired after the power supply cable is broken needs to be immersed in water, the cable shall be treated or replaced according to the waterproof connection and sealing requirements of the cable joint.
4. The action of the thermal protector of the water ring vacuum pump may also be the reason for the sudden non rotation of the vacuum pump: the main reason for the action of the thermal protector of the vacuum pump is the overload of the vacuum pump or the poor heat dissipation or dehydration operation of the vacuum pump motor; Or it is caused by malfunction of thermal protector. The treatment method is to check the cause of the action of the thermal protector and eliminate it, waiting for its automatic reset or repair and adjustment.
5. The stator winding of the water ring vacuum pump is burnt out, which may also be the cause of the sudden non rotation of the vacuum pump. If it is found that the stator winding of the vacuum pump is burnt out, first check the cause of the damage of the stator winding and eliminate the fault to prevent the motor stator winding from being damaged again; Then disassemble and repair the motor stator winding and replace the damaged stator winding as required.
7. There may also be the reason why the motor is burnt out due to water ingress caused by medium corrosion. The liquid is corrosive. It is recommended to use stainless steel.
Therefore, once the water ring vacuum pump used by everyone has such a situation, what to do is always careful and careful inspection. The inspection results determine which way we will choose to deal with it, so that we can continue to use the vacuum pump.

Vacuum unit-vacuum pump preventive maintenance

How to judge whether the vacuum pump leaks in vacuum pump maintenance

How to judge whether the vacuum pump leaks? The vacuum pump maintenance manufacturer summarizes the following points:
1. Check whether the gravity return water of feed pump with vacuum pump speed regulation can be introduced into the condenser. If the return water volume is small and the water seal bag cannot be sealed, the gravity return water of the sealing water of the feed pump shall be poured into the gutter.
2. Vacuum pump maintenance: check whether the vacuum damaged door is closed and there is no leakage.
3. Check whether there is air leakage in the local area where the suction pipe of the vacuum pump is connected with the cylinder. The load decreases, the vacuum degree decreases, the load increases, and the vacuum degree increases slightly.
4. Vacuum pump maintenance: check whether the drain valve on the steam side of the condenser is closed and there is no leakage.
5. Check whether the water level of low-pressure heater under negative pressure is normal and whether the drain valve is tight.
6. Vacuum pump maintenance: check that the water level gauge of the vacuum system is not cracked or leaking.
7. Check whether the water seal, pipeline, flange or joint of the vacuum system valve are not tight, especially the pipeline and valve opening from the expansion tank or boiler start-up separator to the condenser.
8. Check the exhaust safety valve of the low-pressure cylinder of the vacuum pump.
The vacuum pump maintenance manufacturer shows that the leakage of the general vacuum pump is caused by the following conditions.
1) The sealing of vacuum pump is not tight: tighten all connecting bolts, tighten the packing gland, and wrap the connection between pipes and instruments and other components. Or replace the gasket and filler. For air leakage, oil lime can also be applied as a temporary remedial measure.
2) Bearing skew: this phenomenon causes the impeller to be installed obliquely in the pump body. For single acting pumps, the axial clearance is uneven. When the shale rotates, part of it will inevitably rub with the side cover, scratch the side cover and impeller end face, and increase the axial clearance. When the gas in the compression chamber passes through the expanded gap, a large amount of gas leaks into the suction chamber, which reduces the vacuum or exhaust pressure. At this time, remove the bearing for repair, and then install it correctly.
3) Vacuum pump maintenance: the front and rear side covers are misaligned. It may be that the front and rear side covers of the vacuum pump are misaligned, and the consequences are the same as the skewed bearings.
4) Heating of vacuum pump: with the increase of vacuum pump temperature, the saturated vapor pressure also increases, which will reduce the vacuum degree, but has no effect on the exhaust pressure.

The relationship between different casting processes and prices of liquid ring vacuum pumps 

Development of water ring vacuum pump

The development of water ring vacuum pump enterprise focuses on the advantages of products. In the practical application of water ring vacuum pump, the company fully reflects the advantages of products with strong technical ability. Many years of design and production experience has thoroughly demonstrated the application strength of the whole product and reflected the performance of the product in the use process of each user. In the face of the feedback, many people give positive replies to the product. Its application not only drives the company, but also improves the development of various industries, Further realize the advantages and strength of product development. Through the production expansion of water ring vacuum pump, in order to increase the effective improvement of the practical application capacity of the product, the company takes the reliability and stability of the product as the basis for development according to the demand capacity of its users, so as to develop the overall performance of the practical value of the product, and enhance the application effect in all aspects with the advantages of the product, so as to contribute to the future development of the product, Provide reliable basic capability, so we should promote the superiority of its application capability with the advantage of product performance. Increasing the performance of the practical capacity of the water ring vacuum pump, taking the application of the product as the basis for development and enhancing the use capacity of its products is an effective improvement of the production capacity of the enterprise. Therefore, to increase the promotion of the water ring pump, it is necessary to increase the development of the whole production foundation and improve the effective promotion of the actual development of products.

Roots Vacuum Pumps of Common Faults

Understand the causes of wear of screw vacuum pump and reduce wear

 

The screw vacuum pump must be installed in a position with ventilation and keep the pump body at a certain level to ensure smooth operation and low vibration of the vacuum pump; The exhaust nozzle of the screw vacuum pump is connected to the outdoor with a leather pipe to avoid oil vapor polluting the environment and reduce pollution. So how much do you know about the causes of screw vacuum pump wear? Here are some reasons for the wear of screw vacuum pump, including the following aspects: The operation of screw vacuum pump is relatively stable in the actual use process, but some users react that serious wear occurs when the vacuum pump runs for a long time, and serious wear affects the production and use effect of vacuum pump. At this time, we should understand the causes of wear, and then reduce wear as much as possible. 《1》 Because the material is not plasticized uniformly, or metal foreign matters are mixed in the speculation, the rolling torque of the screw of the screw vacuum pump is suddenly added, which exceeds the strength bearing capacity of the screw, resulting in wear. 《2》 When granular plastics enter the barrel from the hopper, they will first reach the feed section. Dry friction is inevitable in the feeding part. When these plastics lack heat and melt unevenly, it is easy to form the inner wall of the screw vacuum pump barrel and the external wear of the screw increases. 《3》 If there are fillers such as calcium carbonate and glass fiber, the wear of screw and barrel can be accelerated. 《4》 In the shrinkage and homogenization part, if the melting state of the plastic is disordered and uneven, the wear will increase. 《5》 Because some plastics are reinforced, such as glass fiber, minerals or other fillers. Compared with molten plastics, these substances have greater friction against metal materials. 《6》 The screw of screw vacuum pump rolls in the barrel, and the conflict between materials and barrel leads to the gradual wear of the working appearance of screw and barrel. The diameter of the screw decreases gradually and the diameter of the inner hole of the cylinder increases gradually. In this way, with the gradual wear of the screw and barrel, the diameter gap between the screw and barrel gradually increases. 《7》 If high-speed conversion is used to increase the shear force of plastic during injection molding, it will also produce corresponding tear fibers in the reinforcement. The torn fiber contains sharp ends, which will greatly increase the wear force. 《8》 When inorganic minerals slide at high speed on the metal surface, their scraping effect is not small. So the speed should not be too high. 《9》 Since the resistance of the head and deflector in front of the barrel does not change, the leakage flow of extruded material is increased, that is, the material flow increases from the diameter gap to the feed direction.

2X-A Two Stage Rotary Vane Piston Pump used in District Cooling

Do you know the vacuum degree of the vacuum pump?

Air extraction
The pumping volume is a measure factor of the pumping speed of vacuum pump. General units are L / s and m ³/ H. It is a parameter to make up for the air leakage rate. It is not difficult to understand why a vacuum pump with large air volume can easily pump the vacuum we need, while a vacuum pump with small air volume is very slow or even unable to pump the vacuum we want? The pipeline or container can never be absolutely free of air leakage, and the large air extraction makes up for the decrease of vacuum caused by air leakage, and the air volume can easily reach the ideal vacuum value.
Vacuum pump
vacuum degree
It indicates the degree of gas dilution under vacuum, which is usually expressed by pressure value. The vacuum degree value indicates that the actual value of the system pressure is lower than the atmospheric pressure. The value expressed from the table is also called the table pressure, which is also called the limit relative pressure in the industry. In practical application, the vacuum degree usually has two versions: absolute vacuum and relative vacuum. The value read from the vacuum gauge is called vacuum degree. Vacuum degree = atmospheric pressure - absolute pressure (the atmospheric pressure is generally 101325pa, and the ultimate absolute pressure of water ring vacuum pump is 3300pa; Limit absolute pressure of rotary vane vacuum pump (about 10Pa)
Vacuum
Theoretically, it means that there is no substance in the volume. In reality, there is no real vacuum. Generally, the pressure in the container lower than the normal atmospheric pressure (101325 PA) is called vacuum state.
Absolute vacuum and relative vacuum
Limit relative pressure
The relative pressure is how much lower the measured internal pressure is than the "atmospheric pressure". It shows that the actual value of system pressure is lower than the value of atmospheric pressure. Because the air inside the container is pumped, the internal pressure is always lower than the external pressure of the container. When expressed by relative pressure or gauge pressure, the value must be preceded by a negative sign, indicating that the internal pressure of the container is lower than the external pressure.
Ultimate absolute pressure
Absolute pressure is how much higher the measured internal pressure is than "theoretical vacuum (theoretical vacuum pressure value is 0Pa)". It compares the absolute vacuum pressure of the theoretical state. Due to the limitation of process, we can't pump the internal pressure to the value of absolute vacuum 0Pa in any case. The vacuum value pumped by the vacuum pump is higher than the theoretical vacuum value. Therefore, when expressed in absolute vacuum, there is no negative sign in front of the value.

vacuum pump in semiconductor remover application

Clarify 3 problems before vacuum measurement

First of all, we should have a more comprehensive understanding of all aspects of the tested object.
It mainly includes: the properties of the tested object, whether it is condensable gas or non condensable gas, whether it is single or mixed, inert gas or active gas or corrosive gas; Whether the air flow state is steady or instantaneous, whether it is uniform or non-uniform; Whether the temperature is isothermal or non isothermal, high temperature or low temperature; Whether there are special conditions such as magnetic field, electric field, vibration, impact, acceleration, charged particles, radiation, etc.
Secondly, according to the situation of the tested object and the research purpose, correctly select the vacuum gauge, and need to understand the principle, range and limitations of the selected vacuum gauge, so as to use the vacuum gauge correctly.
Third, we should understand the interaction between the vacuum gauge and the measured object.
The principles of various vacuum gauges are different, and its introduction may cause changes in some states of the measured object; At the same time, the gas in the measured object may also affect the vacuum gauge, change its performance and interfere with its work.
Moreover, when introducing the technical characteristics of vacuum measurement, fozhen has mentioned that the measurement accuracy of vacuum measurement is not high due to many influencing factors and difficult to control. Therefore, in order to carry out ideal vacuum measurement, we must fully understand the above-mentioned problems, so as not to cause greater errors or errors.

dry screw vacuum pump in EVA production process 

How should dry vacuum pump manufacturers choose?

When purchasing products, we should understand the quality of products, as well as the service and after-sales of brand manufacturers. Only in this way can we obtain more cost-effective services and products. Dry vacuum pump is a very common industrial equipment in the market, and it is widely used. So, how should dry vacuum pump manufacturers choose? What details should we pay attention to? Friends who want to know, let's have a look.
1、 Inspect the service system of the manufacturer
The manufacturer of each product is different in terms of service system. We should choose the manufacturer of dry vacuum pump, and we must choose the manufacturer with perfect service system and after-sales service. The reason for this choice is that manufacturers with after-sales service can provide high-quality products and services to protect the legitimate interests of businesses.
2、 Price of consulting products
When producing dry vacuum pumps, different manufacturers will choose different materials and use different technologies. Therefore, the production cost and price of products are different. When purchasing dry vacuum pump equipment, we should understand the price of the product and consult the function, service life and other aspects of the product. In this way, the product can be correctly evaluated.
3、 Understand the contents of the contract
Before signing the commodity contract with the dry vacuum pump manufacturer, we should confirm the contents of the contract. For example, product specification, model, quality, etc. At the same time, we should also understand the production period of products and relevant technical standards. In this way, we can get more professional services.
When selecting specific manufacturers, we should combine the above information. Regular and reliable dry vacuum pump manufacturers can ensure product quality and provide customers with high-quality after-sales service.

Roots-piston Vacuum Pump System Used in Vacuum Furnaces 

Regeneration of cryogenic vacuum pump

Unlike other gas transfer pumps, the cryogenic pump will be saturated in the gas capture process, so it is necessary to release the adsorbed captured gas to restore the capture capacity, which is called the regeneration process.
The regeneration of cryogenic vacuum pump actually includes partial regeneration (only releasing the gas adsorbed by the secondary cold plate) and full regeneration (releasing all the gas adsorbed by the cold plate). What this paper wants to understand is several ways of all regeneration of cryogenic pump.
1、 Natural temperature rise method. After turning off the refrigerator, use the heat of the pump wall to slowly heat up the vacuum pump. When the pressure in the vacuum pump rises to the effect of convective heat transfer, the heating rate accelerates and then reaches a stable heating value.
2、 Outgassing temperature rise method. After turning off the refrigerator, open the vent valve and put in clean and dry air to quickly heat up the cold plate of the low-temperature vacuum pump.
3、 Electric heating method. An electric heater is installed on the primary and secondary cold plate of the low-temperature vacuum pump. During regeneration, the low-temperature plate is heated rapidly by electric heating to shorten the regeneration time.
Among these regeneration methods, natural temperature rise is applicable to the vacuum system that removes a small amount of gas and is not continuous and long-term exhaust, which generally takes 5 ~ 6 hours. In applications requiring rapid regeneration, the latter two regeneration methods need to be adopted.
In the regeneration process of cryogenic vacuum pump, the released gas needs to be pumped out in time to prevent possible damage to the pump body or the glass tube shell of vacuum gauge, or even explosion. Because when the temperature rises to a certain temperature, the desorption speed of permanent gas is very fast, and the pressure in the pump body can rise to more than one atmospheric pressure within a few minutes.

Membrane separation vacuum pump unit selection for medical and petrochemical industries  

Difference between single-stage and bipolar rotary vane vacuum pumps

 

For the rotary vane vacuum pump, it must be divided into single-stage and two-stage. There is also a great difference in terms of single-stage and two-stage. For the oil seal rotary vane vacuum pump, we used to call the direct belt driven rotary vane vacuum pump, and directly connect the pump with the motor or connect it with a coupling, which is called the direct rotary vane vacuum pump. Here, we should pay attention to that for each pump, there are single-stage and two-stage. And in the single-stage pump, because the selected structural form and its parameters are different, the ultimate pressure of the pump and its purpose are also different. As far as the single-stage and bipolar rotary vane vacuum pumps are concerned, in terms of their common characteristics and their structure, they are actually relatively simple and convenient in terms of their use, that is, they can be started under atmospheric pressure, that is, they can be directly discharged into the atmosphere, and their eccentric mass is relatively small, In terms of its maintenance, it is also relatively simple. In terms of the structure of the pump itself, it is also improved. In this way, its reliability will be improved. In terms of the structure of the vacuum pump, in order to prevent oil return when the pump is stopped, a check valve that can automatically cut off the oil circuit will be set. However, in other terms, it will also be equipped with an air inlet channel stop valve. In addition, in order to automatically cut off the gas circuit to our pump port when the pump operates in the gas town and there is a sudden power failure, When it is in the state of vacuum rotary vane vacuum pump, in fact, it will be equipped with oil pump and control structure. For the two-stage rotary vane vacuum pump, it can also be widely used in refrigerators, air conditioners, light bulbs and fluorescent lamps. In addition, it can be used in bottle bladder production and electronics. In addition, it can be used in many industries such as metallurgy and medicine. Moreover, because the direct vacuum pump has no dust pollution caused by belt friction, its volume is relatively small and its weight is very light.

Dry screw vacuum pump for heat pipe industry

Present situation and Prospect of dry screw vacuum pump

At present, the development of various vacuum pumps is more and more affected by vacuum applications. The general vacuum system can not meet the requirements of clean and oil-free corrosion resistance. Therefore, in recent years, the market demand of dry vacuum pumps is very large, and the vacuum products have been updated. A large number of oil-free vacuum systems have been replaced by oil-free and clean vacuum systems.
Almost every large vacuum company abroad produces various types of dry vacuum pumps. Screw vacuum pump is a non-contact dry pump. It is an ideal pump in the early 1990s. It occupies the market with its advantages of wide pumping speed range, simple and compact structure, no friction of air extraction chamber components, long service life, low energy consumption and no oil pollution. However, most of its manufacturing technology is mastered by foreign countries. China is still in its infancy, and the market has great demand for dry pumps
At present, the development of various vacuum pumps is more and more affected by vacuum applications. The general vacuum system can not meet the requirements of clean and oil-free corrosion resistance. Therefore, in recent years, the market demand of dry vacuum pumps is very large, and the vacuum products have been updated. A large number of oil-free vacuum systems have been replaced by oil-free and clean vacuum systems.
Almost every large vacuum company abroad produces various types of dry vacuum pumps. Screw vacuum pump is a non-contact dry pump. It is an ideal pump in the early 1990s. It occupies the market with its advantages of wide pumping speed range, simple and compact structure, no friction of air extraction chamber components, long service life, low energy consumption and no oil pollution. However, most of its manufacturing technology is mastered by foreign countries. China is still in its infancy, and the market has great demand for dry pumps
Present situation of dry vacuum pump
Due to its superior performance, dry screw vacuum pump has become the preferred vacuum equipment in microelectronics, semiconductor, pharmaceutical, precision processing and other industries in Europe, America and Japan. On the basis of screw compressor, Japan has long developed the multi head rotor profile of vacuum pump and put it into the market. Several German vacuum equipment companies have also gradually developed equal pitch and variable pitch rotor profiles, and have done a lot of research on rotor and body cooling.
Key technical problems of screw pump:
Structure of dry screw pump:
The structure of screw vacuum pump is mainly composed of screw rotor, shell, cooling circulation and sealing materials. The transmission shaft is connected with the driving rotor and drives the driven rotor to rotate through the synchronous gear. A cooling water channel is opened on the shell to cool the temperature of the rotor and exhaust port. The synchronous gear and bearing are lubricated with oil. The interior of the bearing and housing is sealed by seals to achieve the effect of oil-free. The structure of dry screw vacuum pump is similar to that of oil-free screw compressor in sealing and lubrication. Generally, mechanical seals are used at the exhaust end of vacuum pumps, and double lip seals are commonly used at the inlet side. In terms of transmission mode, at present, the common is direct connected motor, which is connected with rotor by coupling, and very few are driven by belt or chain.
Due to no internal compression process, the exhaust temperature of equal pitch screw pump is very high (about 110 ℃). If the cooling effect is not good, it will cause deformation of rotor and casing and affect the sobbing effect. Therefore, cooling the casing is an essential link, and water cooling is a common method. Cooling water is supplied to the outer side of the bearing in the casing body to cool the casing and then the rotor. Laibao company applies water cooling inside the rotor to increase the service life of the rotor and achieve good cooling effect. However, this kind of structural design (two-stage type) requires certain technical and processing level support.
Sometimes the cooling effect cannot be achieved by water cooling, so the cooling gas (mostly nitrogen) is usually passed near the rotor at the exhaust end. Now the mainstream screw vacuum pump abroad adopts this method. This method has several advantages: it can cool the casing of the rotor and reduce the exhaust temperature; Second, when the gas contains particles, it can prevent particle deposition or chemical reaction from causing explosion.
Overview of dry vacuum pumps produced by domestic and foreign companies
(1) KDP and SDV series screw vacuum pumps of Taher company. Taher acquired Kenny vacuum. Kenny is a professional manufacturer of vacuum equipment in the United States with a long history. It is also in a world position in the manufacturing of screw vacuum pump. KDP series is a vacuum pump with equal pitch rotor, and SDV is a variable pitch screw pump. Both are water-cooling systems, and air cooling systems can be selected. SDV is an improvement based on KDP. The variable pitch screw pump can realize the internal compression of gas, reduce the exhaust temperature, and save 30% energy compared with the same pitch. Niflon coating is adopted on the rotor, i.e. the layer is Ni and the second layer is PFA. Even if the PFA is worn, the Ni layer can achieve corrosion protection, and kalrez perfluorinated rubber sealing ring is adopted. SDV series is the screw vacuum pump mainly promoted by Kenny company.
(2) The srewtine series screw oil-free compression vacuum pump officially launched by LeiBao company in Germany at the end of 2002 is a dry pump specially designed for industrial applications (non semiconductor applications). It is a new design and is specially used to solve the difficult vacuum problems in industrial applications. Such as dust, tar, etc. The pump also adopts variable pitch rotor with internal compression process. There is no internal valve in the pump cavity, so it has strong resistance to dust and tar. The screw of the pump adopts internal hollow cooling, which can reduce the rotor temperature and thermal deformation, so the service life of the screw is prolonged.
(3) Cobran series screw pump of Germany puxu company is a vacuum pump for manufacturing process, which is especially suitable for various process flows in chemical and pharmaceutical industries. Puxu is one of the suppliers of vacuum pumps, blowers and compressors in the world. The quality of vacuum pumps is high. Compared with other manufacturers, puxu has a high market share in Europe and the price is expensive.
(4) VSA / VSB series of Richler, Germany. VSA is an equal pitch rotor with good market evaluation and stable performance. VSB Series event pitch rotor design (non-linear tooth shape design), like other companies, changes the power consumption and exhaust temperature of the pump through internal compression. Without two-stage compression and intermediate cooling, a single stage can achieve very high vacuum. The sealing element is improved. The static sealing element is preferably PTFE or the sealing element added with PTFE. The dynamic sealing element uses double sealing lips on the suction side of the vacuum pump, and a simple sealing ring with gas overflow prevention is used on the exhaust side of the vacuum pump to prevent solid substances from entering the pump.
(5) Japanese manufacturers. Screw vacuum pumps are widely used in Japan, and are widely used in semiconductor and LCD industries. Yoshimura soldiers of Dahuang Co., Ltd. applied for patents on single head first-class screw rotors for a long time and made in-depth research on rotors. Hitachi also made research on screw pump in the early stage.
3. Research prospect:
The domestic research of dry screw vacuum pump is still in the initial stage, and many technical problems have not been solved. For example, the rotor coating anti-corrosion technology, reducing the temperature of the exhaust port and increasing the utilization rate of the rotor area are still very difficult. When extracting some active gas, due to the high exhaust temperature, it also needs to be considered in the design. When used in the occasion where the volume needs to be controlled, how to reduce noise should also become the research direction, However, its superior performance determines that it will dominate the vacuum equipment industry, just like the dominant position of screw compressor in the industry.

Dry Screw Vacuum Pumps Used In Fruit Freeze Drying Industry