scroll vacuum pump working principle

scroll vacuum pump working principle

scroll vacuum pump mainly includes left stator, right stator, rotor, crankshaft, anti rotation mechanism, air inlet, exhaust port and other parts. The gas is compressed in the crescent cavity composed of a vortex stator and a vortex rotor. The vortex stator is fixed on the periphery of the frame, and an air inlet is arranged around the vortex stator, and an air outlet is arranged at the center of the rotor and the stator vortex body. With the rotation of the crankshaft, the vortex rotor takes the eccentricity as its radius and makes a revolution around the stator center. In addition, the vortex rotor is restrained by the anti autobiographical structure, so it can not autobiographically, and always maintains a fixed posture, in which the center moves around the center of the vortex stator in a circle with a radius of R.

When the scroll vacuum pump is running, the vortex lines of the two vortex stators and the vortex rotors are basically the same. As long as the phases of the two are staggered 180 ° and the centers of the two are kept together R, they can be combined. Results a series of crescent shaped compression cavities were formed between the two vortices. Every 90 ° rotation of the center of the vortex rotor makes a circular motion in a clockwise direction. After the suction, the compression chamber of the outer circumference of the vortex is in a closed state. Therefore, it can be assumed that the volume of the compressor chamber becomes smaller as it moves towards the center.

A compression chamber from the suction, compression, and finally exhaust the whole process. In order to reduce the weight of the pump scroll body, the base material is aluminum, and a layer of polytetrafluoroethylene with special performance is coated on the surface to increase the wear resistance and corrosion resistance. The pressure difference between the adjacent working chambers of the vortex body of the pump is small, so the gas leakage is small, the driving torque of the pump changes little, so the noise and vibration of the pump are low.

The pump is characterized by light weight, small volume and horizontal structure. It can be directly pumped to 10-1pa from atmospheric pressure. It is a dry vacuum pump with a wide range of use.

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Analysis of water ring pump system

Analysis of water ring pump system

The water ring vacuum pump was originally used as a self-priming pump. It is composed of impeller, pump body, suction and exhaust disc, water ring formed by water on the inner wall of pump body, suction port, exhaust port, auxiliary exhaust valve, etc. Today, we will follow the vacuum pump manufacturer to understand the water ring pump system.

In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture return and vacuum degassing, water ring pump is widely used. Due to the rapid development of vacuum application technology, water ring pump has been paid more and more attention in the aspect of obtaining crude vacuum. Because the gas compression in the water ring pump is isothermal, it can pump out flammable and explosive gas, in addition, it can also pump out the gas containing dust and water. Therefore, the application of water ring pump is increasing day by day.

The pump body is filled with appropriate amount of water as working fluid. When the impeller rotates clockwise as shown in the figure, the water is thrown around by the impeller. Due to the centrifugal force, the water forms a closed ring of approximately equal thickness, which is determined by the shape of the pump cavity. The inner surface of the lower part of the water ring is just tangent to the impeller hub, and the inner surface of the upper part of the water ring is just in contact with the top of the blade (in fact, the blade has a certain insertion depth in the water ring). At this time, a crescent space is formed between the impeller hub and the water ring, and this space is divided into several small cavities equal to the number of blades by the impeller. If the starting point is 0 ° at the lower part of the impeller, the volume of the small cavity will increase from small to large when the impeller is 180 ° before rotation, and the small cavity is connected with the suction port on the end face, at this time, the gas will be inhaled, and the small cavity will be isolated with the suction port when the suction is finished; when the impeller continues to rotate, the small cavity will change from large to small, so that the gas will be compressed; when the small cavity is connected with the exhaust port, the gas will be discharged out of the pump.

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XD type rotary vane vacuum pump Installation

XD type rotary vane vacuum pump Installation

XD type rotary vane vacuum pump shall be placed horizontally. As the pump operation almost no vibration can not be fixed. There are metric screw holes on the damping pad at the bottom of XD rotary vane vacuum pump to fix the pump. Do not push or pull the pump on the ground to avoid damaging the damping pad.

In order to ensure good cooling of XD rotary vane vacuum pump, the cooling air inlet and outlet of the pump shall be more than 30cm away from the surrounding objects. In order to facilitate maintenance, it is recommended to leave a gap of 0.4m in front of the air inlet and exhaust port of XD rotary vane vacuum pump. The base with oil drain pan can be installed for oil drain.

XD rotary vane vacuum pump is shipped without oil. After installation, slowly fill the specified vacuum pump oil (see maintenance 5.1) through the oil filler to 3 / 4 of the oil window height.

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How to choose the type of vacuum pump

How to choose the type of vacuum pump?

I. the type of vacuum pump is mainly determined by the air volume, vacuum degree or exhaust pressure required for operation.

When the vacuum pump works, the following two aspects should be paid attention to:

1. As far as possible, it is required to operate in the high efficiency area, that is, the area with critical vacuum degree or critical exhaust pressure.

2. Avoid operation near the maximum vacuum or exhaust pressure. In this area, not only the efficiency is very low, but also the work is very unstable, easy to produce vibration and noise. For vacuum pumps with high vacuum degree, cavitation often occurs when they operate in this area. The obvious sign of this phenomenon is that there is noise and vibration in the vacuum pump. Cavitation will cause damage to vacuum pump body, impeller and other parts, so that the vacuum pump can not work.

According to the above principles, when the vacuum degree or gas pressure required by the vacuum pump is not high, it can be selected preferentially in the single-stage vacuum pump. If the vacuum degree or exhaust pressure is high, the single-stage vacuum pump is often unable to meet the requirements, or the vacuum pump is required to have a large amount of gas under the condition of high vacuum degree, that is, the performance curve is required to be relatively flat under the condition of high vacuum degree, so the two-stage vacuum pump can be selected. If the vacuum degree is required to be more than - 710mmhg, water ring atmosphere vacuum pump or water ring roots vacuum unit can be selected as the vacuum pumping device.

If it is only used for vacuum pump, it is better to choose single acting vacuum pump. Because the single acting vacuum pump is simple in structure, easy to manufacture and maintain, and has good cavitation resistance under high vacuum.

If it is only used for compressor with larger air volume, it is suitable to select double acting vacuum pump. Because the double acting vacuum pump has large air volume, small volume and light weight, the radial force can be automatically balanced, the shaft is not easy to produce fatigue fracture, and the service life of the vacuum pump is long.

II. Select vacuum pump according to the air volume required by the system

After the type of vacuum pump is preliminarily selected, the model of vacuum pump shall be selected according to the air volume required by the system.

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Characteristics of Roots vacuum pump

Characteristics of Roots vacuum pump

Roots vacuum pump has been used in various industrial sectors 30 years ago, some of which are still in use. Roots vacuum pump can solve any vacuum problems in the paper-making process, such as tissue paper plate, printing paper plate, vacuum dehydrator and other industries. The performance of the vacuum pump has reached a very high level because of putting various improvement measures into the production process.

The main advantage of using roots vacuum pump is that if the pump is installed and used according to the specified technical indicators, it can always coordinate the normal production of paper machine and improve the output.

According to the given point of the paper machine, a specific pump can be selected properly, so that its capacity can meet the needs of the point according to the output and operation index of the paper machine.

Roots Vacuum Pump

ZJ Roots Vacuum Pump

ZJP Roots Vacuum Pump

Design parameter selection of liquid ring pump

Design parameter selection of liquid ring pump

According to the above analysis, the flow process in the liquid ring pump is much more complex than that in the general vane pump, and its complexity is shown in the following aspects:

(1) the liquid flow in the pump has a free surface whose shape, velocity and pressure distribution depend on the phase line action of the liquid flow and the air flow, which is unknown. However, when analyzing the flow of liquid and gas, the velocity and pressure of the surface must be known as the boundary conditions, which is obviously a very difficult subject.

(2) the flow in the inter blade flow passage of the liquid ring pump is unsteady. The flow in the suction area flows from the inside to the outside, and in the compression area and the exhaust area flows from the outside to the inside. Therefore, if the flow analysis of the liquid ring pump is to be carried out, the unsteady analysis method must be adopted, which will greatly increase the calculation work.

(3) in general vane pump impeller, the flow field structure is periodic symmetry, that is to say, the flow in any inter blade flow channel is the same, so as long as one inter blade flow channel is analyzed, but in liquid ring pump, the flow in each inter blade flow channel is different, and the flow in each flow channel affects each other through the liquid ring outside the impeller, so the whole flow field must be connected As a whole, it will greatly increase the amount of calculation

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Practical application of vacuum pump in vacuum drying

Practical application of vacuum pump in vacuum drying

Vacuum pump is widely used in the process of vacuum drying. The so-called vacuum drying is a kind of drying method that puts the material under negative pressure and reaches the boiling point under negative pressure through heating properly or makes the material solidify through melting point after cooling. Under the condition of negative pressure, the boiling point of the water in the material decreases with the increase of vacuum degree. At the same time, the water vapor content is reduced by the vacuum pump clearance, which makes the water and other solutions in the material obtain enough kinetic energy to separate from the material surface. Vacuum drying due to negative pressure

Lower isolation of air makes some materials easy to oxidize and other chemical changes in the drying process better maintain the original characteristics, and can also be better protected by injecting inert gas and vacuuming. Common vacuum drying equipment include: vacuum drying oven, continuous vacuum drying equipment, etc.

The process of vacuum drying is to place the dried materials in a closed drying chamber, vacuum the dried materials with a vacuum system and heat them continuously, so that the water inside the materials diffuses to the surface through the pressure difference or concentration difference, and the water molecules obtain enough kinetic energy on the surface of the materials. After overcoming the mutual attraction between the molecules, they escape to the low-pressure space of the vacuum chamber, so as to be true The process of pumping.

In the process of vacuum drying, the pressure in the drying chamber is always lower than the atmospheric pressure, the number of gas molecules is small, the density is low, and the oxygen content is low, so it can dry materials that are easy to oxidize and deteriorate, inflammable and explosive dangerous goods, etc. It can play a certain role in disinfection and sterilization of drugs, food and biological products, and can reduce the chance of material contamination or inhibit the growth of some bacteria.

Because the temperature of water is directly proportional to the vapor pressure in the process of vaporization, the water in the material can vaporize at low temperature during vacuum drying, which can realize low-temperature drying. This is beneficial to the drying of heat sensitive materials in some drugs, foods and agricultural by-products.

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