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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