water ring pump analysis of flow process

In the design of the water ring pump, it is very important to determine the circumferential speed of the impeller, because the peripheral speed has a great influence on the performance of the pump, which can be said to be global. Other parameters of the pump such as critical compression ratio, pole
Limiting vacuum, efficiency, etc. are closely related to the weekly speed. Generally speaking, if the peripheral speed is too small, the pump will not reach the predetermined critical compression ratio, and the ultimate vacuum will also decrease.
The working range of the pump is narrowed, and the power of the shaft in the high vacuum zone is increased. On the other hand, if the peripheral speed is too large, although the critical compression ratio and the ultimate vacuum of the pump can be increased, the excessive peripheral speed will be
If the efficiency of the pump is reduced, the shaft power will also rise. Moreover, due to the vaporization pressure of the liquid ring medium, the excessive peripheral speed will not increase the critical compression ratio proportionally. Therefore, the peripheral speed
The selection should not be too large. How to reasonably select the peripheral speed so that the pump has both satisfactory performance and small energy consumption is a problem worthy of discussion when designing the water ring pump.
When the impeller rotates to drive the liquid to rotate to form a liquid ring, the liquid ring acts as a boundary of the closed chamber and continuously obtains kinetic energy from the impeller in the suction zone, and the speed continues to increase until the impeller is the most
The peripheral speed of the impeller of the large eccentric point reaches the large value of the site, and in the compression zone, the work of the gas is compressed in the form of "live cold", and part of the kinetic energy obtained from the impeller is transmitted to the gas to make the gas
The body pressure rises, and the working process of the water ring pump is actually the most energy conversion process between the impeller, the liquid ring and the gas, and the energy level rule is obeyed. Among them, the kinetic energy of the liquid ring
Depends on the peripheral speed of the impeller. The large peripheral velocity indicates that the kinetic energy of the liquid from the impeller is large, and the function of the gas is strong, which means that a certain volume of gas can be obtained higher.
The compression ratio; conversely, the liquid exerts a weaker function on the gas.
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Rotary vane vacuum pump in material production application

In the material production process, the problem of material transportation between production links has become an important issue that restricts pharmaceutical companies to improve production processes and improve product quality. The rotary vane vacuum pump of Dongguan Punok Vacuum Technology Co., Ltd. is used in material production.

The rotary vacuum pump is used to vacuum the material, which is the transfer of bulk materials (powder, particles), which completely eliminates environmental pollution caused by material leakage and damage to the operator's body, as well as the surrounding environment. Material contamination.

During the transportation process, a large amount of dust may be generated, which pollutes the environment and affects the health of the operator. Some materials are also flammable, explosive, toxic, harmful and other special properties. At this time, a rotary vane vacuum pump is needed to remove these harmful gases.
The recommendation of Dongguan Punok Vacuum Technology Co., Ltd. is to minimize the direct contact between people and materials, so that the material is transported in a closed environment. In this way, labor can be saved, cost can be reduced, cross-contamination can be avoided, and the automation degree of the solid preparation process can be improved.

The vacuum source of the vacuum feeding device has various forms, such as a vacuum generator, a rotary vane vacuum pump, a Roots blower, and the like. The rotary vane vacuum pump has a simple structure, small volume, maintenance-free, low noise, and convenient control, and can also eliminate static electricity of materials, and fully meets GMP requirements.
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Reasons for Overload of Vacuum Pump

Combining the installation form and working principle of DVE vacuum pump, the reasons of overload and low efficiency of DVE vacuum pump are analyzed.
(1) Influences of basic installation on equipment body.
The quality of equipment foundation installation has a great influence on the quality of equipment operation. The improper placement of cushion iron may easily cause the suspension of foot bolts in all parts of the equipment. In the process of alignment and fastening, the suspension of cushion iron will cause the deformation of cross head slideway in crankcase, and the blockage of cross head during reciprocating operation in the slideway will increase the load.
The structure design of W5 reciprocating DVE vacuum pump is that the cylinder block is at one end of the body, and the weight of the cylinder block is heavier after adding piston and intake and exhaust valves. If the lower support or upper hanger of the cylinder block is not taken into account in the basic design, the cylinder block will be in a suspension state. Because of the weight of the cylinder block, the deformation of the crankcase slideway and the poor concentricity of the cylinder block and slideway will result in the reciprocating operation of the When the piston is blocked and the piston is blocked during reciprocating operation in the cylinder, the load increases.
According to the above analysis, it is found that the cylinder end of DVE vacuum pump is slightly lower than the crankcase end, the cylinder end pad iron is less, and the cross head slideway is deformed after fastening the foot bolt, which causes the cross head to be blocked in the slideway and the piston to run back and forth in the cylinder and causes the load to increase, which is one of the causes of motor overheating.
(2) Coking of cylinder block and valve
Influenced by the process, the cylinder block and valve body of reciprocating pump are easy to coke, and the coking of cylinder block and piston will cause the piston to be blocked in reciprocating operation in the cylinder block, resulting in an increase in load; the coking of valve body will cause blocked exhaust, inadequate closure of valve plates, increased load and low vacuum; the coking of the remaining clearance of the cylinder block will also cause the piston to collide with the cylinder, and the coking phenomenon of both cylinder block and valve plates is found by inspection. This is the main reason for the low vacuum.
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Roots rotary unit application range

The Roots rotary vane unit has the characteristics of high vacuum and wide range of pumping speed. It is suitable for pumping out dry and clean gas. Let's take a look at its scope of application:
Roots rotary vane unit is widely used in vacuum smelting, power capacitors, transformer vacuum heat treatment, pre-extraction of vacuum coating equipment, electric vacuum semiconductor and other industries to remove oxygen-containing, non-explosive, metal-free in closed containers. Non-corrosive, does not react chemically with pump oil.
The rate is 30 to 1200 L / S (liter / sec); the ultimate pressure is 0.05 Pa (Pa); gas type, clean air without other mixture at room temperature, air with other dust and moisture is not allowed; work requirements, imported pressure Continuous working time at more than 6500Pa allows continuous operation for a long period of time.
The Roots rotary vane unit is suitable for pumping air and other non-condensable, non-corrosive gases. It is widely used in various vacuum systems that require high pumping speeds and low and high vacuum. For example: vacuum smelting, steel liquid degassing, vacuum sintering, dynamic vacuum acquisition in large space simulation test, power capacitor, transformer vacuum immersion treatment, fluorescent tube, automatic exhaust on the bulb production line, continuous exhaust of the thermos bottle , pre-extraction in vacuum coating equipment, pumping in magnesium reduction process, degassing in single crystal silicon refining process, and the like.
Only by understanding the application range of the Roots rotary unit can you use it better. I hope that the content shared above will help you.
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Water ring vacuum pump starting and running

I. preparation before starting:
1, check the motor steering, make it and water ring vacuum pump steering the same.
2, water ring vacuum pump placed for a long time should be poured into the vacuum pump before the start of cleaning, with the hand disk rotor several turns, make it free, and then discharge sewage.
3. If there is a reducer, check whether the oil level in the machine is normal and whether the cooling water is unobstructed.
4, if the belt rotation, should check whether the belt tightness is appropriate, whether the two pulley is good.
5, check the pressure of the water supply system, water volume can meet the requirements of the vacuum pump.
Ii. Starting:
1. Put working water into the water ring vacuum pump until there is water flowing out of the automatic drainage valve at the water ring vacuum pump side.
2. Close the inlet valve on the intake pipe and open the bypass valve.
3. Open the filler water supply valve and make the water pressure 0.02-0.05mpa (if the water supplied with filler is omitted).
4. Start the motor, after the water ring vacuum pump operates normally, open the water ring water supply valve, open the air inlet valve on the intake pipe, and close the bypass valve.
5. After hearing the sound of suction and exhaust, adjust the water supply pressure of shaft seal packing and the water supply pressure of water ring again. The water pressure of packing: 0.02-0.05mpa.
Third, stop
1. Close the inlet valve, open the bypass valve and close the water ring water supply valve.
2. After a short time, the compressed sound inside the vacuum pump is heard to be reduced, and the vacuum value is reduced. Stop the motor.
3, close the filler water supply valve (if the internal supply of filler water omitted).
4, if the shutdown time is too long, open the water ring vacuum pump on both sides of the lower drainage screw plug (or blind cover), drain the pump sewage.

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Roots vacuum pump features:

There is no oil in the pump chamber to achieve a high clean vacuum.
The rotor has good geometric symmetry for low noise and long life.
The pump is made of aluminum alloy as a whole, which realizes fast heat dissipation and corrosion resistance of the pump and improves the service life of the pump.
It starts fast and can reach the vacuum in a short time.
Compact and lightweight, with a small footprint.

Roots vacuum pump product application:

● Lighting, electronics, optics, semiconductors, analytical instruments, etc.
● Coating, sputtering, ion plating, liquid crystal injection, vacuum drying, freeze drying, vacuum degassing, etc.
● Vacuum heat treatment furnace, sintering furnace, brazing furnace, leak detection equipment, CO2 laser equipment, etc.

Vacuum pump product application:

Vacuum pumps in vacuum packaging, food processing, pneumatic conveying, semiconductors, solar, plastics, chemicals and pharmaceuticals, hospital healthcare, environmental engineering, composites, metallurgy, oil and gas, surface treatment technology, electronics and power, wood processing, There are a wide range of applications in many industrial fields such as mechanical manufacturing.
Roots vacuum pump advantages:
1. Protect the lubricating oil, not emulsified, not contaminated by the medium;
2. Protect the bearing and gear to make it last longer;
3, reduce the frequency of oil and oil change, maintenance is more convenient.

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Water Ring Vacuum Pump Installation

Pre-assembly preparation and installation process of water ring vacuum pump
Before assembling the water-ring vacuum pump, the joint surface of each component should be carefully cleaned. All the mating surfaces and threads should be carefully cleaned and coated with oil. The old oil in rolling bearings and bearing racks should be removed, and the required pads should be prepared. Then the assembly should proceed in the following order.
(1) The impeller of the water ring vacuum pump is mounted on the shaft, and then the sleeve and nut are mounted.
(2) Connect the pump body and the back cover of the water ring vacuum pump, feed it into the rotor and install the front cover.
(3) Install filling box and back bearing frame of water ring vacuum pump, then install back bearing, and fix it with nut. Adjust the gap between impeller and front and back end caps. Then install front and back bearing caps.
(4) Install water ring vacuum pump coupling.
(5) To adjust the end clearance between impeller and front and rear cover of water ring vacuum pump, SZB-3 and SZB-4 shall not exceed 0.4mm. SZB-1 and SZB-2 shall not exceed 0.3mm. The clearance shall be obtained by adding paper pads between pump body and front and rear cover.
(6) In order to make the gap between the two sides of the water ring vacuum pump uniform, the sleeve can be used to adjust. Firstly, the rear axle is positioned, and the impeller end is drilled tightly on the end surface of the back cover. Then, the rear axle sleeve is adjusted so that the impeller moves about half of the total clearance in the direction of the coupling, and then the front axle sleeve is pressed on the impeller.
(7) Install the packing of the water ring vacuum pump and press the packing cap tightly.
(8) The assembled water-ring vacuum pump should be light, uniform and qualified without obstruction when using hand-disc coupling.

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Solutions to Common Operation Faults of Vacuum Units

Common failures, but also summarized for you the causes of these failures and solutions. Common failures are:
1. Difficult starting, motor tripping or overcurrent
2. Stuck phenomenon during test run or operation
3. The inspiratory capacity decreased significantly.
4. Abnormal operation sound
5. great vibration
6. Heating of Bearing Parts
First: Start-up difficulties
Reason:
1. The liquid level in the liquid ring vacuum pump is too high when starting.
2. Rust on internal parts or ice inside the pump;
3. The discharge pressure increased.
4. Improper adjustment of current protection for distribution panel.
Processing methods:
1. Start according to the specified level (below the automatic drainage valve);
2. Pull the rotor forcefully, and water supply and flush, steam heating and melting ice;
3. Check whether the diameter of exhaust pipe and valve is too small.
4. Adjust thermal relay to current rating.
2. Stuck in test run or operation
Reason:
1. Foreign bodies such as welding slag and iron scraps are brought into the pump body by gas in the new pipeline.
2. Scaling is serious.
Processing methods:
1. The front and rear bolts can be loosened, the impellers can be rotated and washed with water, and the bolts can be tightened after flexible rotation. If it cannot be ruled out, it must be removed and inspected.
2. Dismantling and cleaning or pickling.
3. Inhalation volume decreased significantly.
Reason:
1. insufficient liquid supply or excessive liquid temperature;
2. There is leakage in the system.
3. Medium is corroded or brought into material abrasion, which enlarges the gap between internal parts and corrodes them.
4. After repair, the axial clearance does not meet the requirements.
5. The flexible valve plate is damaged.
Processing methods:
1. Adjust the quantity of liquid supply and check whether the pipeline is blocked.
2. Check the sealing of pipeline connection.
3. Replacement of parts;
4. readjust the axial clearance;
Replace valve plate.
Fourth: abnormal operation sound
Reason:
1. Gas scouring or injection;
2. Bearing failure
3. The wall of suction and exhaust pipes is too thin.
Processing methods:
1. Draw the exhaust outlet out of the room;
2. Check the temperature and sound of bearings, replace lubricants or replace bearings.
3. Use trachea with thicker wall.
V: Vibration
Reason:
1. Bad contact between machine base and foundation, loose anchor bolt;
2. Not good at alignment.
Processing methods:
1. Fill the base gap with concrete and tighten the anchor bolt.
2. Re-alignment and locking.
Sixth: Bearing part heating
Reason:
1. Misalignment of motor and liquid ring vacuum pump;
2. Poor lubrication, grease drying up or too much;
3. Improper installation of bearings;
4. Bearing corrosion, abrasion and scratch of raceway.
Processing methods:
1. Re-alignment;
2. Improve lubrication conditions;
3. Re-adjust bearing position;
4. Replacement of bearings.

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2BV Water Ring Vacuum Pump Industry Advantages

In view of the continuous development of 2BV water ring vacuum pump, according to the use characteristics of products and other aspects, many manufacturers combine the actual situation of the company to develop products with the advantages of high cost performance ratio, actively develop and produce products, improve the performance of the overall strength of products, and improve the production attitude, so as to improve the ability of practical application of products, and constantly promote their development. The motive force of exhibition is to develop the form of practical application of products and promote the rational production of the company, so as to reflect the goal of enterprise development.
In order to develop 2BV water ring vacuum pump, it is necessary to develop the practical performance of the product in order to exploit its application effect in all aspects, to promote the overall development of the product according to the design requirements of the unit, to expand its continuous development advantages with a higher product form and to enhance the in-depth application ability in all aspects. Only by strict production management mode can the product quality be guaranteed and added. Big power for enterprise development, so as to expand the advantages of unit application capacity.
In the whole vacuum industry, the status of 2BV water ring vacuum pump is also gradually improving. From the advantages of its practicability, it can hold the ability of products. In the process of enhancing the ability of product application development, it is necessary to further promote the development of its performance and expand the application value of products.

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Roots vacuum pump cautions for disassembly and assembly

Roots vacuum pump may have some minor faults in the process of use. Returning to the factory for maintenance will waste a lot of time and bring losses to the enterprise, which requires the manufacturer to disassemble and repair itself. How can we disassemble and assemble the equipment correctly? Let's get to know it.
1. Before the Roots vacuum pump is dismantled, the clearance of each part of the rotor is measured and recorded.
2. Avoid hammering as much as possible. The parts removed should not be bruised and kept properly.
3. Record in detail the reasons for replacement of parts and components that need to be replaced and their usage.
4. Before reassembling Roots vacuum pump, all parts must be cleaned and burrs repaired.
5. The "106" silicone rubber coating is used for the static sealing surface without gasket or seal ring. Vacuum coke grease should be applied to clean and sealed rubber seals. Sealing rings on relief valves of vacuum pumps with relief valves and flat surfaces shall not be coated with Renke grease.
6. Adjust the clearance of each part of the rotor according to the clearance list.
7. Leakage must be checked after all are installed.
8. Trial operation and necessary performance test should be carried out after reinstallation. It can not be installed and used until it is normal.
The disassembly and assembly of Roots vacuum pump should be carried out in strict accordance with the operation instructions. During the disassembly process, the data and steps should be carefully recorded. Leakage should be checked before reuse. Otherwise, the damage of the equipment will be deepened and the loss will be overwhelming.

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Water Ring Vacuum Pump in Ceramic Vacuum Filter Application

Precision ceramic vacuum filter integrates electromechanical, microporous ceramics and ultrasonic technology. It relies on the suction and capillary action of water ring vacuum pump to realize solid-liquid separation. It is widely used in mining, metallurgy, chemical industry, environmental protection and other industries.
Characteristic:
In high vacuum (0.09-0.098 MPa), the moisture content of filter cake is low.
The solid content of filtrate is less than 50 ppm. It can be reused to reduce emissions.
Compared with the traditional filter equipment, the energy consumption can be saved by more than 90%, the energy consumption is low and the operation cost is low.
Compared with traditional ceramic filters, filter cake washing is added, which is suitable for materials to be washed.
The use of PLC, computer and automatic valve control, high degree of automation, reduce labor intensity.
Compact structure, small area, easy installation and maintenance.
The advanced drainage system can be used under any working conditions.
Working principle:
Slurry suction zone: When working, the filter plate immersed in the slurry is combined with vacuum pressure under capillary action, and the surface is adsorbed into a layer of filter cake. The filtrate enters the distribution valve through the filter plate to the drainage tank.
Leaching area: After the filter cake is turned out of the slurry hopper, the filter cake is sprayed and washed.
Drying zone: The filter cake continues to dehydrate under the action of high vacuum force of water ring vacuum pump.
Discharging area: In the absence of vacuum, the scraper discharges automatically.
Backwashing: Industrial water or filtrate enters the ceramic plate through a distribution valve and is cleaned from inside to outside. Clean the blocked micropore. After a period of using the ceramic plate, the ceramic plate can be cleaned by the combination of ultrasonic wave and low concentration acid in order to keep the high efficiency of using the ceramic plate.
Main components: filter board, main engine, air-water mixed constant pressure backwashing system, control system
Application scope
At present, it has been widely used in the dewatering of non-ferrous metals, rare metals, ferrous metals, non-metallic concentrates and tailings in mines, oxides, electrolytic slag, leaching slag, dewatering of slag and acid treatment of waste sewage sludge in chemical industry. Material fineness ranges from - 200 to - 450 meshes and various superfine materials.

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Multistage Roots Pump Application

Dry, air-cooled multi-stage Roots pumps in the range can be directly used to replace oil-lubricated rotary vane vacuum pumps in the range of available pumping speeds because of their involvement and performance parameters.
The advantages of multistage Roots pumps include:
There is no lubricant in the gas displacement area.
Medium pumped with oil or ion is free from any pollution.
No working fluid treatment problem
Constant vacuum parameters with long-term stability
High Reliability Due to Minimum Number of Fragile Parts
When each power supply is connected to the main power supply frequency and general power supply, it has a constant working parameter of one-phase or three-phase converter.
Air cooling, no installation cost and water cooling operation cost
Continuous operation for high inlet pressure
Long maintenance intervals lead to low operating costs
Selection of Remote Control Using Frequency Converter
Ideally used for this application due to adjustable rpm, reduced noise level, energy utilization and power input
Minimum leakage rate
Ideal front stage pump for turbomolecular pump and Roots pump
Certification meets UL/CSA and SEMI S2 requirements
steam
If there is no additional measures, because of its relatively low working temperature, the use of oil-free pumps will have the risk of condensation in the pump. Similar to rotary vane vacuum pumps, multi-stage Roots pumps are equipped with air ballasts to increase steam tolerance and steam capacity of pumps. The formation of condensate in the pump increases the limit pressure, which leads to corrosion, and in the worst case, will lead to pump failure.
In the case of no gas town, the pump can transport medium with moisture content up to 5%. Using the standard pump gas town, the steam tolerance is 10 hPa and the steam capacity is 100 g. H - 1. In the special pump version (CV, condensable steam), gas throughput can be increased to achieve steam tolerance of about 100 hPa and steam capacity of 700 to 1,000 G H - 1, depending on the ambient temperature.
As for rotary vane vacuum pumps: before evacuating steam, the pump body must be preheated by air ballast for at least half an hour. High temperature pump body reduces condensation. Other ways to reduce condensation include obtaining the lowest possible outlet pressure and discharging condensate separately. Vertical exhaust pipes must be used to prevent back pressure at the exit. If there is an extraction system, the export should be connected to it.
Dust and Particles
If there is no control over the entry of large particles, in the worst case, the multi-stage Roots pump can be blocked and completely failed. Therefore, in dust-containing process or glass manufacturing, filter is installed at the intake side to prevent damage.
Corrosive gas
Pumps are not suitable for pumping large quantities of corrosive gases. In this respect, multistage Roots pumps can be used in corrosive gas processes in the semiconductor, solar and paint industries (see Section 4.6). However, the pump can be used to treat at least a small amount of corrosive gas. In this case, the version with inert gas purification is used, in which the bearing is protected by inert gas curtain, and the process gas is diluted by introducing inert gas into a pump stage.
Its high air tightness guarantees the long-term use of multistage Roots pumps and the best solution for the use of expensive gases (4He, 3He, isotope labeled gases) in the gas circuit.
Light Gas and High Vacuum
Multistage Roots pumps have outlet valves to prevent moisture and oxygen from diffusing back into the suction chamber, which can lead to chemical reactions in the pump in the application of corrosive gases. If vacuum is needed to prevent light gas accumulation and reflux diffusion, the valve must be opened regularly (e.g. through the gas town) in application.
Even if the use of micro vacuum or gas towers at the exhaust is sufficient to replace even continuous helium gas throughput, such as in cryostat of evaporator, the performance data are almost the same as that of nitrogen or air.

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Water Ring Vacuum Pump Vacuum Drainage Steps

The use of water ring vacuum pump has been very common, its use of water is indispensable, once the lack of water, it needs to carry out vacuum water diversion, only in this way can ensure its efficiency. What steps can we take to realize the vacuum water diversion of the water ring pump?
The intake pipe of the water ring vacuum pump is connected with the top of the pump cover. Where there is no tap water, the air-water separator must be equipped as the source of cooling water and supplementary water for the vacuum pump. The water supply pipe must be connected with the intake pipe. During the operation, the water of the gas-water separator is continuously supplied to the pump along the pipe under the action of the low pressure of the intake pipe.
First, close the gate in the pump pressure pipe and inject water into the water ring vacuum pump. After filling, close the valve on the funnel, open the valve on the intake pipe and the valve on the water supply pipe, and then start the machine.
The mixture of water and air is discharged from the exhaust pipe. At first, the gas is the main component in the mixture. Then, the water becomes more and more. When all the water is water, it means that the water is full of the pump, so the diversion is completed and the pump can be started. Close the intake pipe valve and stop the water ring vacuum pump.
If there are more than two pumps in the pumping station, the intake pipe of the water ring vacuum pump can be connected with the exhaust main pipe, and the top of the pump shell of each pump can be connected with the exhaust main pipe through the exhaust branch pipe. A valve is installed on each branch pipe so that each pump can be pumped separately.
Sometimes, for standby purposes, two water ring vacuum pumps can be set up, and valves are installed on each intake pipe. When a fault occurs, the intake valve on the pump can be closed, and another pump can be used to exhaust without delaying the start of the pump. Normally, two machines can pump water at the same time to accelerate the speed of water diversion.

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Roots vacuum pumps cannot be used alone

We often hear or see a lot of people talking about Roots vacuum pumps online. In fact, this is not the correct way. Roots vacuum pumps are used in many applications with liquid pumps such as liquid ring vacuum pumps or screw vacuum pumps.
1, Roots vacuum pump can not be used alone, it usually needs to configure the foreline pump, mainly to increase the pumping speed, so it is also called mechanical booster pump.
2. The start of the Roots vacuum pump is only required to start when the foreline pump is pumped to the Roots vacuum pump to allow the starting pressure. Direct start or failure to reach the air pressure requirement will cause the Roots vacuum pump to overload and burn the motor. Usually the starting pressure is about 1.5 times the pressure difference. For example, the pressure difference of ZJ150 is 6000pa, then the starting pressure is that the water ring pump can start when the system pressure is pumped to 90 mbar.
3. If the foreline pump is a water ring pump, in order to prevent the circulating water of the water ring pump from flowing back into the fuel tank, a check valve must be installed between the front water ring pumps.
4, Roots vacuum pump must pass the Roots vacuum pump unit to play its role.

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Performance Characteristics of Roots Rotary Plate Unit

Roots rotary vane unit is a pumping unit composed of Roots pump as the main pump, single-stage or double-stage rotary vane vacuum pump as the front pump. The unit has the characteristics of high vacuum and wide range of pumping speed. It is more suitable for pumping dry and clean gas. When there is a gas ballast device, the gas containing a small amount of water vapor can also be extracted. This series of units have been widely used in metallurgy, chemical industry, light industry, petroleum, medicine, printing and dyeing, electrical appliances, electric vacuum, semiconductor, food, atomic energy, textile and other industries. The following is an introduction to its performance characteristics:
1. Roots rotary vane unit is mainly pumped by Roots vacuum pump, single-stage or double-stage rotary vane pump is used as low and high vacuum acquisition equipment of front-stage pump. The whole unit is installed on a rack, equipped with pipes, valves and electrical operation control boxes, and also equipped with cooling water pipe system. The structure of the unit is compact and easy to use. The unit has high vacuum, low noise and sustainable operation.
2. The nominal pumping speed ratio between the pumps of Roots rotary vane unit is generally between 4:1 and 10:1. In order to prevent the front vane vacuum pump from shutting down and returning oil, an electromagnetic vent valve is installed on the front pipeline. Its action is connected with the motor of the front vane vacuum pump, thus ensuring the normal operation of the pump.
3. In order to improve the pumping performance of vacuum units, to achieve a higher limit vacuum and to improve the pumping speed characteristics at low inlet pressure, and to equip large vacuum units with small-sized front pole pumps, Roots rotary vane vacuum units can also be connected in series with two-stage Roots vacuum pumps to form three-stage units according to customer requirements.

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Roots Vacuum Pump in Medical Vacuum Refrigeration Application

Vacuum freeze-drying is a better method of material dehydration at present. It can freeze the freeze-dried material in advance, and then sublimate the moisture of the material at low temperature and low pressure to achieve the purpose of dehydration. Sublimated water vapor is collected by condensation. After this vacuum freeze-drying, the substance becomes dehydrated.
After vacuum freeze-drying, the enzymatic activity of the material is weak, the original chemical and physiological properties are basically unchanged, the drying material is porous structure, the volume is basically unchanged and easy to recover. In particular, the vacuum freeze-dried substances can be preserved for several years without deterioration.
Condenser is a device for condensing and sublimating water vapor. Its working overflow can reach - 45 C to - 60 C. The refrigeration source is provided by two 2F6.3 Freon refrigeration units.
The vacuum unit of dryer is composed of two 2X-5 rotary vane mechanical vacuum pumps and one ZL-8 Roots mechanical booster pump. The vacuum unit is connected with the drying box and condenser through vacuum pipelines and vacuum valves, forming a sealed vacuum system. The vacuum unit is equipped with an electric contact vacuum meter, which can automatically control the starting of Roots pump according to the pre-selected vacuum position. There is a vacuum butterfly valve in the vacuum pipeline between the drying box and the condenser, which can be switched on and off at any time according to the use requirements. The bottom of the condenser is equipped with branch vacuum pipeline leading to the hot air blower, and the middle valve is separated by 50 butterfly valves. The function of this valve and branch pipeline is for defrosting and drying of the condenser. The vacuum branch pipe above the Roots pump is the passageway when the mechanical vacuum pump is used alone. It is equipped with solenoid valves. When the Roots pump is started, the width will automatically close. Close. The vacuum pipeline is equipped with a solenoid belt bleeding stop valve. When the vacuum pump stops, the vacuum pipeline can be automatically closed. At the same time, air is put into the vacuum pipeline to avoid the vacuum pump oil rushing into the vacuum pipeline due to negative pressure. A corrugated hose is installed between the connecting pipes of the vacuum pump to prevent vibration from passing to its components during operation.

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Water Ring Vacuum Pump Main Types of Impeller Damage

The main types of blade damage of water ring vacuum pump are blade damage, blade crack, blade corrosion or cavitation.
1. blade interruption
The main reason is that there are solid blocks inside the water ring vacuum pump, such as metal blocks, gravel and so on. When the impeller rotates, it hits the solid hard block or is stuck by the solid hard block, which breaks the blade. In addition, due to the stress concentration at the root of the blade, the fatigue damage caused by the gas and hydraulic pressure in the small chamber of the pump is caused. The impeller with damaged blades should be replaced in time, and the causes should be found out, and corresponding measures should be taken.
2. blade crack
It usually occurs at the root of the leaf. Most of them belong to fatigue cracks, and some of them are due to the casting cracks caused by the large difference between the blade and wheel size of the impeller of water ring vacuum pump. Cracked impellers should be replaced to avoid blade breakage and accidents.
3. abrasion of blades
If the impeller is damaged by friction with the impeller surface or by cavitation, it should be replaced seriously. If the damage is not serious, it can be repaired by repairing welding method. When repairing, the impeller can be heated to 600 C, and then repaired. When the blade gun size increases after repairing welding, the original size must be machined with a file or on a lathe, otherwise the original performance of the water ring vacuum pump will be affected.

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Vacuum Pump in Natural Gas Treatment Technology Application

In natural gas production, some processes often need to be carried out at less than one atmospheric pressure. The so-called vacuum pump is a kind of mechanical equipment that can obtain an absolute pressure below atmospheric pressure. According to the structure, there are many types of vacuum pumps. Several common types of vacuum pumps in production are introduced as follows:
(1) Reciprocating vacuum pump
The working principle of reciprocating vacuum pump is similar to that of reciprocating compressor except that the valve used is lighter and the clearance is smaller. Generally, it is single-stage, and the inhalation gas pressure is much lower than the local atmospheric pressure at that time. Reciprocating vacuum pumps are dry type and domestic reciprocating vacuum pumps are coded W. Now there are five main specifications of W 1 to W 5, which have been widely used.
(2) jet pump
Jet pump uses hydrostatic energy to transfer kinetic energy when fluid flows. It can be used to suck liquids or gases. It is often used in evaporation and distillation systems to produce vacuum, so it is also called jet vacuum pump.
(3) Water ring vacuum pump
Water ring vacuum pump is a wet vacuum pump, which can obtain 85% vacuum degree. The pump has simple structure, compact structure, no valve and can be connected vertically by motor. The series of domestic water-ring vacuum pumps is named sz. This kind of vacuum pumps are often used to suck air and non-corrosive, water-insoluble and solid-free gases.

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Rotary Vacuum Pump in Industry Application

Many enterprises hope to improve production efficiency and profit margin without affecting product quality and safety. Dongguan Punock Vacuum Technology Co., Ltd. recommended the rotary vane vacuum pump to many customers, because the rotary vane vacuum pump is applied in industry, which is more efficient and energy-saving, and meets the needs of enterprises.
Rotary vane vacuum pump has repeatability, can work for a long time, improve production output, but also save costs, can work in a harsh working environment without failures, so it has brought many benefits to industry.
Most importantly, it enhances the reliability of the pump. Rotary vane vacuum pumps are not as affected by steam or dust as oil seal pumps, so they are more durable and require less maintenance. Reducing oil consumption also means reducing the cost of carefully handling oil. It can also minimize contamination, which may occur in the oil, thus affecting the performance of the pump, and even in some extreme cases.
Rotary vane vacuum pumps have been successfully used in industry for many years, and become more and more common in various fields. It has been more fully prepared to meet the challenges from more and more industrial applications, in which the traditional oil seal technology once dominated.
The reason for the increasing application of rotary vane vacuum pumps is clear, because they are reliable, wear-resistant, easy to maintain, and bring significant benefits to the results.

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