Screw vacuum pump
Screw vacuum pump is a kind of non-contact dry vacuum pump. The two screws are supported by bearings and installed in the pump shell after fine dynamic balance correction. There is a certain gap between the screws. There is no friction between the two pumps during operation. The operation is stable, the noise is low, and the working chamber does not need lubricating oil. Therefore, the screw pump can pump out the gas situation with a large amount of water vapor and a small amount of dust, extremely Higher vacuum limit, lower power consumption, energy saving, maintenance free and other advantages. The pump is widely used for its advantages of wide pumping speed range, simple and compact structure, no friction of pumping cavity components, long service life, low energy consumption, no oil pollution and so on. It has gradually become a new generation of oil sealed vacuum pump.
The screw vacuum pump has a wide range of application, high vacuum degree, and its vacuum degree and pumping rate are not affected by the environment, so a clean vacuum can be obtained.
Roots vacuum pump
Roots vacuum pump manufacturer, also known as mechanical booster pump, is a positive displacement vacuum pump. A gas cooler is installed under the exhaust port. Part of the cooled gas returns to the pump cavity through the pipe to cool the rotor, so as to balance the compression heat, so this pump can directly exhaust the atmosphere. In order to meet the requirements of different limit vacuum degree, this kind of pump can be used in series. Generally, an air-cooled direct discharge atmospheric Roots pump is added in front of it, and the limit vacuum reached is one order of magnitude higher than that of the previous pump. Because there is no working medium in the pump cavity, this kind of pump is actually a dry pump. This kind of air-cooled direct exhaust roots pump and unit has been tested in petroleum, chemical, plastic, pesticide, turbine rotor dynamic balance, aerospace space simulation and other devices for a long time.
Reciprocating vacuum pump
Reciprocating vacuum pump is a kind of low vacuum equipment. It is a kind of vacuum pump that the working volume of the pump cavity (cylinder) changes periodically by the reciprocating motion of the piston, also known as piston vacuum pump. The structure of reciprocating vacuum pump is similar to that of reciprocating piston compressor. During operation, the suction pipe is connected to the evacuated container, and the exhaust pipe is directly connected to the atmosphere. The pumping rate of reciprocating vacuum pump is 45-20000 cubic meters per hour, the limit pressure of single-stage pump is about 103 PA, and that of double-stage pump is up to 1 PA.
Reciprocating vacuum pump is not suitable for pumping corrosive or granular dust gas. If dust is contained in the pumped gas, a filter must be installed at the inlet of the pump.
Water ring vacuum pump
The water ring vacuum pump manufacturer is a kind of crude vacuum pump. The limit vacuum it can obtain is 2000 ~ 4000Pa, and the series atmospheric ejector can reach 270 ~ 670pa. Water ring pump can also be used as compressor, which is called water ring compressor. It belongs to low-pressure compressor, and its pressure range is 1 ~ 2 × 105Pa gauge pressure. The pump body is filled with a proper amount of water as the working fluid, which realizes suction, compression and exhaust by the change of the volume of the pump cavity, so it belongs to the variable volume vacuum pump.
Compared with other mechanical vacuum pumps, water ring vacuum pump has the following advantages:
The structure is simple, the manufacturing accuracy is not high, and it is easy to process.
Compact structure, high number of pump revolutions, generally can be directly connected with the motor, no reduction device. Therefore, with a small structure size, a large exhaust volume can be obtained, and the floor area is also small.
Compressed gas is basically isothermal, that is, the temperature change of compressed gas process is very small.
Because there is no metal friction surface in the pump cavity, there is no need to lubricate the pump, and the wear is very small. The seal between the rotating part and the fixed part can be directly completed by the water seal.
The suction is even, the work is stable and reliable, the operation is simple, and the maintenance is convenient.
Water ring vacuum pump also has its disadvantages:
The efficiency is low, generally around 30%, and the better can reach 50%.
The low vacuum degree is not only limited by the structure, but also by the saturated vapor pressure of working fluid. When water is used as working fluid, the limit pressure can only reach 2000-4000pa. Using oil as working fluid can reach 130pa.