Dry Vacuum Pumps Classification

Dry vacuum pumps main types:

1. Dry screw vacuum pump
2. Oil-free reciprocating vacuum pump
3. Claw vacuum pump
4. Oil-free Vortex Vacuum Pump

Dry Vacuum Pump Working Principle:

Screw Vacuum Pump

LG Series Screw Vacuum Pump

1. Dry screw vacuum pump

Dry screw vacuum pump is a kind of suction and exhaust equipment which uses a pair of screw to make synchronous high-speed reverse rotation in the pump housing. The two screw are corrected by fine dynamic balance, supported by bearing and installed in the pump housing. There is a certain gap between screw and screw. Therefore, when the pump works, there is no abrasion between them. Rubbing, smooth operation, low noise, working chamber without lubricating oil, therefore, dry screw pump can extract gas containing a large amount of steam and a small amount of dust occasions, higher limit vacuum, lower power consumption, energy saving, maintenance-free advantages. It is an updated product of oil seal/water ring/jet vacuum pump.

2. Oil-free reciprocating vacuum pump

Vacuum pump, also known as piston vacuum pump, relies on the reciprocating motion of piston to make the working volume of pump chamber (cylinder) change periodically. The structure of reciprocating vacuum pump is similar to that of reciprocating piston compressor. When working, the suction pipe is connected with the vacuum container, and the exhaust pipe goes directly to the atmosphere. Reciprocating vacuum pumps can be used in vacuum distillation, vacuum concentration, vacuum crystallization, vacuum filtration, vacuum drying and concrete vacuum operation.

3. Claw vacuum pump

Claw vacuum pump is composed of multi-stage rotors. Each stage has two rotors. The two rotors rotate in opposite direction. The suction port is connected with the pump chamber. The volume of the pump chamber becomes larger and the suction ends when the rotor closes the suction port. Then the pump chamber becomes smaller and the compressed gas is compressed. When the exhaust port opens, the pump chamber exhausts and the exhaust port closes. The exhaust is finished, so the cycle works.

4. Oil-free Vortex Vacuum Pump

The scroll disc of a scroll oil-free vacuum pump is a scroll structure formed by one or more involute spirals connected with a plane at one end. A pair of whirlpool pairs consisting of a static whirlpool and a moving whirlpool constitute the basic pumping mechanism of the whirlpool oil-free vacuum. For example, in a two-stage scroll oil-free vacuum pump, there are two fixed scroll discs corresponding to two directions, and one rotating scroll disc located between the two scroll discs. The relative motion of the dynamic and static whirlpools forms a crescent-shaped vacuum chamber with constantly changing volume, which enables the gas to be inhaled from the exhaust port, discharged from the exhaust port and completed the exhaust cycle.

Dry Vacuum Pumps

EVP Series Dry Scroll Vacuum Pump


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