Prevent vacuum pump stop pump return oil

When stop running rotary vane vacuum pumps, if there is oil hole and pump chamber are interlinked or surface of exhaust valve, shaft seal, pump cover, air inlet pipe, air valve, such as untight seal, as a result of the existence of liquid level difference and gravity are in a vacuum tank and pump cavity and differential pressure of the pump cavity, oil will be back into the pump chamber, oil amount is large enough, the oil will return to the inlet pipe, cause next time starting resistance is big, rotary vane and rotor bearing, exhaust valve force big, starting difficulties, affecting the service life of parts, reduce the reliability of the pump. Therefore, measures should be taken to prevent the return of pump oil. The principle is to cut off the oil circuit when stopping the pump, eliminate the pump cavity negative pressure, reduce the liquid level difference, reduce the amount of back-in oil.
Common solutions are:
1. Separate the oil near the exhaust valve from the rest of the oil. The oil level is only slightly higher than the partition wall.
2. Move the oil tank and exhaust valve to the side to lower the oil level and reduce the oil volume.
3. The valve seat plane shall be flat and the valve sheet shall be elastic.
4, shaft seal river static sealing parts to be reliable, timely replacement.
5. Pipe the oil hole so that the oil level is only slightly higher than the oil inlet.
6. Set a check valve mechanism to automatically close the oil inlet when the pump stops.
7. Set up the oil pump and auxiliary mechanism, and cut off the oil circuit when stopping the pump.
8. Install air charging valve at the pump port.
9. Pack the entrance container.
The use of check valve and dynamic seal, static seal structure, even in the event of a sudden power failure and do not inflate the pump, can make the pump chamber in a vacuum for a long time, no significant return of oil. However, its reliability is affected by the quality of manufacturing, assembly, oil seals, exhaust valves and other static seals. If you add an inlet container, then, even if the return of oil, also only to the container, it is more reliable.
Check valve has the function of controlling the oil intake. For example, opening the oil hole only takes about a quarter of the time per revolution. Too much oil makes a lot of noise. As the oil contains gas, the limiting total pressure may also decrease. Too small hole processing is difficult, check valve can overcome this difficulty. In addition, in case the check valve parts are damaged, the pump can still be used after removing the check valve stem. However, after stopping the pump, the pump should be inflated immediately to prevent the return of oil, so timely maintenance, for important purposes, can be installed with relief valve or cut-off relief valve.
Users can choose the corresponding solution according to different circumstances.
Syrian liquid ring vacuum pump supplier
Saudi Arabia Liquid Ring Vacuum Pump
Supplier Libya liquid ring vacuum pump

Vietnam vacuum pump 

Roots piston vacuum unit

Dry scroll vacuum pumps

Vacuum pump operation instructions

1. Check the oil level, to stop the pump filling oil to the oil standard center is appropriate. Too low on the exhaust valve can not play the role of oil seal, affect the vacuum degree. Too high, may cause the start of air injection. It is normal for the oil level to rise during operation. Oil mining
Add clean vacuum pump oil of specified brand through the filling hole. After refueling, screw a screw plug. Oil should be filtered to avoid sundries into the oil hole.
2. The 2XZ vacuum pump can be started at the next time through the atmosphere or at any vacuum level. If the pump port is installed with solenoid valve, it should be operated simultaneously with the pump.
3. When the ambient temperature is too high, the temperature of the oil increases, the viscosity decreases, and the saturated vapor pressure increases, leading to a decrease in the limiting vacuum, especially the total pressure measured by the thermocouple. Limit vacuum can be improved by strengthening ventilation and heat dissipation, or improving oil pump performance.
4. Check the limit vacuum of model 2XZ rotary vane vacuum pump with the compressed mercury vacuum gauge as the standard. If the gauge is fully pre-checked, the pump temperature reaches stability, the pump port is directly connected with the gauge, and the limit vacuum will be reached within 30 minutes after operation. The value measured by the total pressure meter is related to the pump oil and vacuum gauge, and the regulatory error, sometimes the error can be very large, only for reference.
5. If the relative humidity is high, or the extracted gas contains more condensible steam, open the air ballast valve after connecting the pumped container, and close the air ballast valve after running for 20 ~ 40 minutes. Before stopping the pump, open the air ballast valve for no-load movement for 30 minutes to extend the pump oil life.
6. Choice of vacuum pump oil: the viscosity of the pump oil affects the starting power and the ultimate vacuum of the pump. When the viscosity is high, the vacuum degree is favorable, and the starting power is larger. The saturated vapor pressure of the oil at pump temperature will affect the ultimate total pressure of the pump, the lower the better. The viscosity of high speed vacuum pump oil and 3# diffusion pump oil is higher than that of no. 1 vacuum pump oil, and the saturated vapor pressure is lower than that of no. 1 vacuum pump oil, but the price of 3# diffusion pump oil is higher. Specific choose what oil, according to the above introduction combined with specific requirements to choose.
(1) in general, high speed vacuum pump oil produced in Shanghai is applied where the total pressure is expected to be above 6x10-2 pa. Small pump below 4 l/s can also be replaced by no. 1 vacuum pump, direct pump above 8 l/s can be replaced by no. 3 diffusion pump.
(2) if the vacuum degree is not high, and the pollution of oil is changed frequently, and the supply of vacuum pump oil is difficult, no. 50 mechanical oil can be used instead.
(3) if the ambient temperature is low, it is difficult to start, and the limit vacuum requirement is not high, zhenzhai pump oil or mechanical oil with slightly lower viscosity can be used
Iran vacuum pump
Saudi Arabia Vacuum Pump
Libya vacuum pump supplier

Dry scroll vacuum pump 

How to Transfer Gas in Stainless Steel Vacuum Pump

Molecule movement on the surface of stainless steel vacuum pump is called migration. Gas molecules in thermal state run from one part of space to the other, migrating physical quantities from high concentration to low concentration until the physical quantities reach uniform distribution. Gas diffusion, viscosity and heat conduction of stainless steel vacuum pump belong to migration phenomenon. Look at the following specific introduction:
1. Diffusion
The movement of gas in another medium due to concentration gradient is called diffusion. Medium can be another gas (diffusion in this case is called interdiffusion) or a condensable substance.
In stainless steel vacuum pumps, helium penetrates through glass up to 10-13 liters per second. Hydrogen can penetrate through iron at 300-400 C, nickel at 450 C, glass at 600 C and copper at 640 C. Diffusion coefficient. The ratio of the absolute mass flow rate per unit area to the normal concentration gradient per unit area is obtained. Diffusion has been widely used in practical technology such as diffusion pump and surface physics.
2. Viscosity and heat conduction of gases
In any medium, the transfer of momentum and the exchange of momentum between layers are called the viscous properties of this medium. The ratio of tangential force to velocity gradient per unit area in the direction of airflow velocity gradient is a viscous coefficient.

Syrian liquid ring vacuum pump
Libya vacuum pump
Vietnam vacuum pump supplier
Iran liquid ring vacuum pump

Water ring vacuum pump will open up new pattern

The latest published data show that the efficiency of machinery industry has been rising in the second half of last year. It has increased rapidly since this year, and the growth rate of profit has been faster than the growth rate of income.
From January to June, the cumulative total profit achieved was 715.3 billion yuan, an increase of 19.58% over the same period of last year; the revenue from the main business completed was 10.4 trillion yuan, an increase of 11.52% over the same period of last year; the profit growth rate was 8.06 percentage points higher than that of the same period of last year, and 7 percentage points higher than that of the same period of last year. The profit rate of the main business income of machinery industry insists on rising momentum. The profit rate from January to June is 6.86%, which is 0.46 percentage points higher than that of last year.
Water ring vacuum pump is a kind of coarse vacuum pump. The maximum vacuum it can obtain is 2000-4000Pa. The vacuum degree of the unit composed of water ring vacuum pump and vacuum pump can reach 1-600Pa. Water ring pump can also be used as a compressor, known as water ring compressor, is attributed to low pressure compressor, its pressure planning is 1 ~ 2 *105Pa gauge pressure.
In recent decades, China's construction machinery has formed a sound professional system, and has become the top production and marketing country in the list of construction machinery. However, after a high-speed development stage, China's domestic construction machinery market stock equipment saturation is higher, the pressure of construction machinery companies increased, the industry competition intensified and the prosperity continued to decline. In this environment, if China's construction machinery companies want to continue their livelihood, it is necessary to open up the post-market, expand the industry in many ways. Business planning.
Even if measured by the average level of all industries, the performance indicators of machinery industry are beyond the usual performance. In the first half of the year, the total profit of industrial companies above the national planning level reached 2864.98 billion yuan, an increase of 11.4% over the same period last year, and the profit rate of the main business income of industrial companies above the national planning level was 5.57%. By comparison, the profit growth rate of machinery industry is about 8.1 percentage points higher and the profit interest rate is nearly 1.3 percentage points higher.
In the first half of this year, the outstanding performance of machinery industry is a bright spot. In the words of people in the industry, the growth rate of profits is higher than the expectations of the outside world, and according to the author, there is no lack of surprise to jump out of the profession to observe.
Saudi Arabia Vacuum Pump Supplier

Syria vacuum pump supplier 

Sugar factory installation liquid ring vacuum pump

Our company is EVP vacuum pump company. This is a feedback photo after installing a vacuum pump in a sugar factory. Can you see if there is any need for this?

Liquid ring vacuum pump noise cause

Liquid ring vacuum pump (hereinafter referred to as liquid ring pump) is a kind of coarse vacuum pump. The maximum vacuum it can obtain is 2000-4000Pa, and the air ejector in series can reach 270-670Pa. Liquid ring pump can also be used as compressor, called Liquid ring compressor. It belongs to low-pressure compressor, and its pressure range is 1-2*105Pa gauge pressure.
Causes of Noise in Liquid ring Vacuum Pump
1. It can't start or it's noisy.
Possible causes: insufficient supply voltage of motor; motor phase-absent operation; long-term uselessness of pump leads to rust; inhalation of impurities in pump; impeller drag distribution plate.
Elimination methods: check whether the supply voltage is too low; check whether the motor wiring is reliable; if the pump is not used for a long time, it can point the rust remover or open the pump cover to remove the rust artificially; open the pump cover to remove impurities; adjust the distance between the impeller and the distribution plate.
2. Reasons for insufficient vacuum
Possible reasons: insufficient power supply of motor leads to insufficient speed; insufficient water supply; excessive gap between impeller and distributor plate; breakage of mechanical seal leads to leakage; excessive wear of impeller; inadequate drainage of circulating water.
Exclusion: Check whether the supply voltage is within the rated voltage range of the motor; Increase the water supply (must be controlled in the correct range, otherwise the motor will overload and heat); Adjust the clearance between the impeller and the distribution plate (generally 0.15-0.20 mm); Replace the mechanical seal; Replace the impeller; Check the pipeline of the outlet.
3. insufficient Liquid ring vacuum pump
Possible causes: leakage of gas and liquid in pipeline; increase of resistance loss;
Removal method: Check the mechanical seal at the connection; Check the pipeline and check valves for faults.
4. Overheating of motor of Liquid ring vacuum pump
Possible causes: excessive water supply leads to motor overload; motor phase absence; blockage of exhaust holes; impeller driving other components.
Removal methods: reduce the water supply to the normal range (refer to the amount of liquid supplied by the pump instructions); check whether the wiring is firm; check the exhaust port; open the pump cover to adjust the gap between impeller and other components.
Vietnam liquid ring vacuum pump supplier

Iran liquid ring vacuum pump supplier 

How can water ring vacuum pump extract flammable liquid?

Our company is a complete vacuum pump set production and processing system of manufacturing enterprises, main vacuum pump set series of mechanical equipment production and sales, committed to use excellent product quality and thoughtful service to reward new and old customers.
Water ring vacuum pump is simple in structure, low in manufacturing accuracy and easy to process. Easy to operate and maintain. Generally, it is directly connected with the motor, and the revolution is higher. With the smaller size of the structure, can get a larger amount of exhaust, in the power, petrochemical, manufacturing, pulp and paper production, plastic packaging and other industries have been widely used. Below, the manufacturer of vacuum pump sets a brief description of a launching ring vacuum pump in the extraction of flammable liquid details.
1. Pay attention to type selection. Before applying water ring vacuum pump for operation, the type of water ring vacuum pump suitable for the operation item should be selected. The type of water ring vacuum pump mainly depends on the pumping medium, the amount of air needed for work, the vacuum degree or exhaust pressure. If the type of vacuum pump or vacuum unit is selected, it is necessary to choose the correct type according to the amount of pumping required by the system.
2. Pay attention to equipment Settings. Corrosive resistant water ring vacuum pump should be selected to extract flammable and explosive liquid. When the vacuum container containing flammable and explosive liquid, corrosion resistance between water ring vacuum pump and the container must be equipped with a vacuum tank, first of all, the water ring vacuum pump vacuum tank to the limit under vacuum, and then close the pump and the vacuum tank valve, to open the container and the valve between the vacuum tank container liquid and air inhaled into the vacuum tank.
3. Pay attention to operating efficiency. As far as possible, the vacuum degree of the selected vacuum pump is required to be in the efficient interval, that is, in the critical vacuum degree or critical required exhaust pressure area, so as to ensure that the vacuum pump can work in accordance with the required conditions and requirements. Avoid operating near the maximum vacuum or exhaust pressure range of the vacuum pump. Operating in this area, not only the efficiency is very low, and the work is very unstable, easy to make the vacuum pump vibration and noise.
Best liquid ring compressor

Asiawater 2018  

How about the pumping capacity of water ring vacuum pump

When the water ring vacuum pump is used, the size of the pumping capacity will affect its working condition. We can generally know its working condition by the situation of pumping, so how can we know its pumping capacity?
Water ring vacuum pump is a device or equipment which can obtain vacuum by mechanical, physical, chemical or physical chemical methods. Its pumping capacity reflects the working efficiency of a water-ring vacuum pump, but it is generally marked with the object of pumping, the unit is L/min, and this value is not a constant value.
The selection of pumping capacity should be based on the need of our vacuum vessel and vacuum degree. For example, a data of water ring vacuum pump is 20 m3/min, which means that the pumping capacity is 20 cubic meters per minute.
When considering the problem of pumping water ring vacuum pump, we can consider the factors that may affect its performance in this respect. How the pumping capacity is related to our actual situation.
cone vacuum pump

Palmex Krabi, Thailand 2018 

Vacuum pump unit after the shutdown process

After the vacuum pump unit is shut down, a series of shut down treatment is needed, otherwise the impurities remaining in the internal will damage the unit, and some other reasons will lead to the failure to start the unit normally next time, so the following will talk about the correct treatment process after the shutdown, please refer to it.
1. First drive the control handle on the control cabinet of the vacuum pump unit into the manual gear, and then manually close the suction valve to separate it from the vacuum system.
2. Stop the pump step by step according to the sequence of the main pump and the front stage of the intermediate pump. Note: the shutdown must be in strict accordance with the correct operation sequence. Manual operation can be stopped at any time, and automatic operation, to wait for the system to reach the required working pressure, can control the unit through the pressure transmitter signal stop.
3. Then empty and close the inlet valve and outlet valve of the vacuum pump set, and then close the water replenishment valve of the soda separator. At this time, make sure that the inlet and outlet valve is closed. After that, open the emptying valve of the soda separator, open the emptying valve of the pump body, and discharge the circulating liquid, check, wipe, maintain the equipment, clean up the sanitation and other work. After confirming that the medium in the pump is cleaned, return the tool, fill in the operation record, and finally cut off the power supply.
4. Please note that if there are impurities in the liquid in the unit, open the bottom of the pump to drain and flush after the unit stops.
5. Vacuum pump unit shall be carefully coated with protective oil after complete cleaning, so as to avoid rust and corrosion of the unit affecting the use effect.
Although the shutdown of vacuum pump unit is very troublesome, if it is done step by step, it will be found that its service life is longer than other units, the failure rate is lower, and the work efficiency is higher. After all, there will always be a return, so we must carefully complete each step of the operation oh.
Liquid ring vacuum pump with integrated closed loop system

Palmex medan, Indonesia 2018 

How to reduce the energy consumption of vacuum pumps?

When choosing vacuum pump, we should not only consider its quality and efficiency, but also consider the high and low energy consumption. Generally, we will choose more energy-saving, how to reduce energy consumption? Here are some simple and feasible ways to teach you.
1. Reasonable selection of materials for vacuum pumps
Considering that the service life of the vacuum unit can be maintained for more than 6 years, the low-cost and easy-to-cast ones should be selected as far as possible. For corrosive liquids and other media, the over-current components should be used to prevent corrosion and stainless steel materials should be used. Of course, the specific selection should be based on the actual needs of the industry.
2. Reasonable determination of the output of vacuum pump
First of all, we should find out the resistance of vacuum pump system at all levels and eliminate the abnormal phenomenon of excessive resistance. Secondly, considering the combined influence of various unfavorable factors, the maximum air supply and pumping capacity is determined, and then the safe and economic system pressure is determined according to the operation requirements. Finally, according to the total pumping capacity, the vacuum unit is reconstructed and the output is allocated to ensure the safety of the system, so that the system can operate at medium speed, so that the vacuum degree and the pumping capacity required under the operating conditions are matched with the efficiency of the vacuum pump.
3. Reasonable use of pipelines
The method of close cooperation between theoretical calculation and model experiment is adopted to select reliable and efficient pipelines, and to ensure that the permitted vacuum under working conditions can be achieved at a possible low pumping capacity.
4. Make the best of the potential of electric motors
Energy saving is what everyone wants. After knowing how to reduce energy consumption of vacuum pump, we will be more satisfied with its use in the future.
liquid ring pump supply

POMREQ 2018 

Vacuum pump bearing heat

Since the vacuum pump is formed at a high speed, the rotor speed is too fast to form a bearing that supports the rotor. There are usually several reasons for bearing overheating during vacuum pump operation:
1. Smooth appearance: the increase of smooth grease is too large or too small, or the smooth grease type does not match, and its use time is too long, or the smooth grease will be contaminated to form bearing heat. At this moment, you should check the smooth grease type, ask the manufacturer the appropriate amount, adjust the smooth grease to recover the bearing temperature.
2. Sensation: When the pump body or bearing is sensational, the bearing temperature will be too high. Look at the pump body to find the cause of the sensation, and eliminate the sensation, then the bearing temperature will recover.
3. Valve cracking: When a valve disc is cracked, the pressure on both sides of the impeller will be unbalanced, the axial force will occur in the rotor, and the bearing load will be intensified. The long-term operation will increase the bearing temperature. In this case, the valve should be replaced in time.
4. The bearing pre-tightening force is too large: this situation will promote the bearing clearance reduction or no play, forming the bearing heating.
5. Shaft end seal failure: When the shaft end seal packing is damaged or the sealing water passage is blocked, air is formed from these damaged gaps and sucked into the pump body, which will form the suction and exhaust performance of the pump. If only one side of the seal fails, the pressure imbalance on both sides of the impeller will be formed, and the axial force of the rotor will increase the bearing load, thereby increasing the bearing temperature.
6, bearing damage: Bearing rolling body and bearing cage damage will be accompanied by the appearance of bearing overheating. Bearing damage is necessary to replace the new bearing in time.
vacuum pump replacement
vacuum pump in Palm Oil Industry
Liquid ring vacuum pump process

What is a Liquid Ring Vacuum Pump? 

The cause of vacuum pump cavitation

Cavitation corrosion is a kind of high-noise and destructive phenomenon often occurred in hydraulic machinery. In vacuum acquisition equipment, cavitation corrosion of water-ring vacuum pump is also known to all, and the damage to vacuum pump is a cumulative process, which is easy to cause impeller perforation.
The principle of its occurrence is: due to the action of liquid dynamics, when the partial pressure of the moving liquid drops to the vaporization pressure at this temperature, the liquid begins to vaporize and form bubble, bubble filled with liquid vapor and a small amount of dissolved gas in the liquid. When the bubble with the moving liquid reaches the area where the static pressure exceeds the critical pressure, the steam in the bubble will suddenly condense and burst the bubble. Because the pressure in the bubble is always lower than or close to the critical value, and the pressure of the external liquid is relatively large, so when the bubble bursts, the surrounding liquid rushes to the bubble center at a very high speed and forms the effect of high-frequency water hammer, generating high local stress and local temperature rise, and generating noise and vibration. Repeated processes of the formation and bursting of such bubbles will damage the surface of parts in this area. In addition, chemical and electrochemical corrosion of liquid and parts materials will eventually result in cavitation damage with spongy or honeycombed characteristics.
It is also shown that cavitation may occur even above the critical pressure. Because the pressure decreases, dissolved in the liquid air and other gas will be analyzed, at the same time, the liquid steam out, full of steam and gas liquid and bubble formation, the bubble in the movement parts surface easily produce and grew up, was taken away by liquid, where high pressure suddenly condensation and burst.
The critical pressure at which cavitation occurs varies with the properties of liquids, temperatures, and dissolved gases. For degassing normal temperature water, the saturated vapor pressure equivalent to that of the water temperature can be taken as the critical pressure value for the occurrence of bubble.

Water ring vacuum pump
Liquid Ring Vacuum Pump
Rotary Vane Vacuum Pump
2bv vacuum pump

What is the flow process in water ring vacuum pump?

Water ring vacuum pump is widely used in our life. What is the flow process in water ring vacuum pump? Today small make up with you to analyze together.
In the design of water ring vacuum pump, it is very important to determine the circumferential velocity of impeller, because the circumferential velocity has a great influence on pump performance, which can be said to be global. Other pump parameters, such as critical compression ratio, ultimate vacuum and efficiency, are closely related to the weekly velocity. Generally speaking, if the weekly velocity is too small, the pump will not reach the predetermined critical compression ratio, and the ultimate vacuum will also decline, resulting in the narrow working range of the pump and the increase of shaft power in high vacuum area. On the other hand, if the peripheral speed is too big, can improve the critical compression ratio and ultimate vacuum pump, but too big weekly rate will decrease the efficiency of the pump, shaft power will also rise. And because of the influence of liquid ring medium evaporation pressure, excessive peripheral speed does not make critical compression ratio proportionately increased. Therefore, peripheral speed selection should not be too big. How to reasonably select peripheral speed, the performance of the pump not only has satisfactory, and there was a small energy consumption, water ring pump is design problem worthy to be discussed.
When rotating impeller spins liquid liquid ring formation, liquid ring as a closed chamber of a boundary on the suction area constantly from kinetic energy, the impeller speed constant Po, until the most eccentric point on the impeller impeller rotational speed to address large value, and in the compression zone in the form of "piston" work for gas compression, will get part of kinetic energy to the gas from the impeller, the gas pressure, the working process of the water ring pump is actually between the impeller, liquid ring, gas to the conversion process, abide by the laws of energy ping street. The kinetic energy of liquid ring depends on the circumferential velocity of impeller. A large circumferential velocity indicates that the liquid has a large kinetic energy from the impeller and a strong ability to do work to the gas, which means that a certain volume of gas can obtain a higher compression ratio. Liquids, on the other hand, do less work with gases.
Liquid Ring Vacuum Pump
Rotary Vane Vacuum Pump

Dry screw vacuum pump

Why the Vacuum Degree of Water Ring Vacuum Pump Decreases in Summer

Advantages of Simultaneous Use of Multiple Water Ring Vacuum Pumps
If customers choose three 2BV water ring vacuum pumps, one for use, one for standby and one for overhaul, they are connected in parallel with three main drainage pumps and controlled by gate valves respectively. The advantages of using water ring vacuum pump are as follows:
(1) Water-ring vacuum pump has simple structure, low processing and manufacturing requirements, no need for suction and exhaust valves, stable operation and uniform air volume;
(2) The compression of gas by water-ring vacuum pump is close to isothermal compression, and the temperature changes little during compression. There is no friction metal contact surface in the pump, so it is not easy to cause combustion and explosion accidents.
(3) The rotating parts and fixtures in the pump chamber are sealed by liquid, without lubrication, simple maintenance, easy operation and stable and reliable operation.
(4) From the results of operation, the drainage efficiency of the main drainage pump is obviously improved after using the water ring vacuum pump, and the start-up procedure is simplified, which reduces the labor intensity during the start-up of the pump. When the pump starts, it has no impact on the pump body and little damage.
(5) After using the water ring vacuum pump, the bottom valve of the inlet of the suction pipe was cancelled, the suction water was unblocked, and the drainage efficiency of the pump was improved.
(6) As the direction of water injection in the water injection pipe is from bottom to top, when the water level rises to the pump body, it can ensure that there is no air in the suction pipe and the pump body, and prevent the occurrence of cavitation, which is conducive to the daily maintenance of the main drainage pump.
Nowadays, many customers who buy rotary vane vacuum pumps reflect that the vacuum of rotary vane pumps that they bought before is always not up to, or oil leakage and injection, which brings a lot of unnecessary troubles to production. Then, what is the reason why the vacuum degree of rotary vane vacuum pump can not reach? The following points are the analysis of our company's technicians, you can take as a reference:
Insufficient oil: Normally, it is not necessary to connect the exhaust pipe. When the pump pumps large containers or carries out gas ballasting for a long time, because of the large amount of gas entering the pump, the exhaust outlet will emit a large amount of oil mist, which will reduce the amount of oil. Insufficient oil will affect the performance of the pump, and even damage the machine parts. The elimination method is to add new oil regularly.
Oil has been polluted: Pump oil will inevitably be polluted by dust, moisture or other dirt when it is often used. Pump oil contamination will affect performance, so oil needs to be changed. The oil change period depends on the nature of the gas being pumped and its actual working conditions. Generally, the oil change period of pumps during air pumping is more suitable for 1000-1500 hours of actual work.
When changing oil, it should be done in the following order:
1) thoroughly drain the old oil in the pump;
2) After the old oil is exhausted, a small amount of new oil (100-200 ml) is injected from the suction port, the pump chamber is flushed, then the pump is started for one minute, and then the injected new oil is exhausted. If the oil is still not clean, the new oil should be injected and flushed until the oil removed from the pump chamber is clean.
3) Add new oil according to the oil capacity prescribed by the pump to make the oil level reach the center of the oil standard. When refueling, attention should be paid to cleaning, and dirt should be strictly prevented from mixing into the pump.
Damage of sealing ring at suction port: There is a special bowl-shaped sealing ring in the exposed part of pump oil. The "O" type sealing ring is installed in the intake and back cover. It may be damaged after using for a long time. Therefore, oil leakage occurs, and the sealing ring should be replaced in time.
Damage of exhaust valve piece: Oil-resistant rubber valve piece is installed in the vent hole of chamber I and II respectively. In the long-term use of pump, the valve piece will be deformed due to pressure and other reasons. As a result, poor sealing and air leakage affect performance, the pump should be dismantled for inspection and timely replacement.
Poor sealing at joint: At this time, the joint of pipeline should be carefully checked to eliminate leakage.
Pump viscera, pollution is serious: whether the pump is clean directly affects the performance of the pump, in the use of the process, the pump will inevitably produce dirty, dirty and so on. It should be cleaned thoroughly with new oil, then dried and assembled carefully.
Reasons for Vacuum Degree Reduction of Medium Water Ring Vacuum Pump in Summer
Recently, many customers have reported that the vacuum of vacuum pumps (especially water ring vacuum pumps) has always been inadequate, and it has been good before. Suddenly, the vacuum has dropped a lot. Through the analysis of our company's technicians, the following reasons are obtained:
(1) In summer, the water-ring vacuum pump uses circulating water to cool working water. Often, the high temperature of circulating water leads to the decrease of pumping capacity and efficiency of the vacuum pump. Through analysis, the working water of cooling water ring vacuum pump of central air-conditioning in power plant is used to improve the vacuum of condenser, and the economic effect is considerable.
(2) When other conditions remain unchanged, the lower the working water temperature, the smaller the impact on vacuum, and the higher the working water temperature, the greater the impact on vacuum.
(3) For double back pressure condenser, because the condenser pressure corresponding to low pressure condenser is low, it is easy to appear that the limit suction pressure of water ring pump is higher than that of condenser. Therefore, special attention should be paid to the influence of working water temperature rise of water ring vacuum pump on low pressure condenser.
(4) Under low load conditions, it is better to reduce the working water temperature to improve the vacuum effect of the condenser.
Oil-free vacuum pump for freeze dryer

Degassing vacuum pump 

What are the elimination methods of water ring vacuum pump

One, vacuum pump degree is not enough
Possible reasons: insufficient power supply of the motor leads to insufficient rotation speed; Insufficient water supply; The clearance between impeller and distribution plate is too large; Mechanical seal damage leads to leakage and air leakage; Excessive impeller wear; Recycled water doesn't drain out.
Exclusion method: check whether the supply voltage is within the rated voltage range of the motor; Increase the water supply (must be controlled in the correct range, otherwise it will lead to motor overload and heating); Adjust the gap between impeller and distribution plate (generally 0.15-0.20mm); Replace mechanical seal; Change impeller; Check outlet piping.
Two, can not start or start a loud noise
Possible reasons: insufficient power supply voltage of the motor; Motor out of phase operation; Long time failure of pump leads to corrosion; Inhalation of sundries in pump; Impeller drag distribution plate.
Elimination method: check whether the supply voltage is too low; Check whether the motor wiring is firm; If the pump does not use for a long time leading to corrosion can add some rust remover or open the pump cover to remove rust artificially; Open pump cover to remove sundries; Adjust the distance between impeller and distribution plate.
Motor overheating
Possible reasons: excessive water supply leads to motor overload; Motor phase deficiency; Blocked vent; Impeller drag other parts.
Elimination method: reduce the water supply to the normal range (refer to the pump instruction manual); Check whether the wiring is firm; Check vent; Open the pump cover to adjust the clearance between the impeller and other parts.
Four, insufficient flow
Possible causes: pipeline leakage of air and liquid; Increased resistance losses;
Elimination method: check the mechanical seal at the joint; Check pipeline and check valve for trouble-free.
Dairy Vacuum Pumps

Vacuum pump for electrical industry 

Liquid steel refining mechanical vacuum pump

The machine vacuum pump set of molten steel refining is running successfully
The newly developed multi-group series and parallel roots water ring vacuum units have been successfully applied to the steel refining and vacuum systems of 10T, 15T and 25t-vd furnaces. After field operation, all the indicators of this unit meet the design requirements. Compared with the traditional steam injection pump, it has the following characteristics:
1. It only consumes electric energy and does not need steam. It is not affected by weather, temperature, steam and other conditions.
2, the unit is equipped with pressure, temperature sensors, through the control cabinet PLC program to effectively control the unit, easy to operate, safe and reliable.
3. Compared with the steam jet pump, the energy saving effect is significant, up to 40~60%.
4. The former stage pump USES water as the working medium for the water ring pump, which is highly insensitive to inflammable, explosive and dust-containing pumped medium.
5, the unique control system can ensure the efficient work of the whole unit, give full play to the pumping characteristics and ability of each pump, will be pumped out of the system to the specified pressure in a short time.
6. Compared with imported mechanical pump unit, it has the same efficiency, but the price can be saved 2~3 times, and the maintenance is convenient and instant.
Corrosive gas vacuum pump

Liquid Ring Vacuum Pump

What are the validation criteria for water ring vacuum pumps?

The optimal running state parameters of water ring vacuum pump can be obtained by numerical simulation using the exhaustive method. Under the design condition of pipe network impedance S, water ring vacuum pump is given a certain differential pressure value, will be two parallel pump all satisfy the differential value of speed combination solution, then calculate combinations corresponding to the total power of each group of rotational speed, and finally find the smallest set of total power speed combination, namely the optimal rotational speed to meet the conditions of water pump combination, further to find out the optimal speed ratio distribution and similar working point. Given the pipe network impedance S, when different pressure difference set value requirements are met, the optimal speed ratio of parallel pumps is a certain value, which is the same as the optimal speed ratio calculated by using criterion 3. The similar working points of the parallel water pump remain unchanged, which are the same as the similar working points calculated by using criterion 2. On the other hand, in the design and selection, the estimation of pipe network impedance is relatively large, or multiplied by a safety factor greater than 1, which will lead to relatively large pump selection.
Therefore, the above conditions rarely appear in the actual conditions. If this condition occurs, the current frequency converter can achieve overfrequency operation, that is, the frequency converter output frequency is more than 50Hz power frequency, but the bearing capacity of the pump motor should be considered. In addition, if conditions do not allow, in the face of such unusual conditions, the system needs to be given priority to ensure that the program can not run in accordance with the optimal speed. Aiming at the rotating speed of variable frequency pumps in parallel in closed circulating water system optimal control problem, the characteristics of variable frequency pumps in parallel model is established, through theoretical analysis, summed up the parallel construction rule of variable frequency pump speed optimization control whole month total amount of cooling by BMS history recorded in the building air conditioning system running data calculated hourly, historical operation data including air conditioning temperature of total water supply, building air conditioning cold water total return water temperature and building air conditioning cold water to total water flow.
Screw vacuum pump in ABS plastic raw material

Liquid ring pump for chemical industry 

Dry Scroll Pumps