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dry vacuum pumps classification

Dry vacuum pump is a kind of mechanical vacuum pump which can start pumping under atmospheric pressure, and can directly discharge the pumped gas into the atmosphere. There is no oil or other working medium in the pump cavity, and the pump's limit pressure is equal to or close to that of oil-sealed vacuum pump.


The main types of dry vacuum pumps:


1. Dry screw vacuum pump

2. oil-free reciprocating vacuum pump

3. Claw vacuum pump

4. oil-free scroll vacuum pump


Dry vacuum pump works:


1. Dry screw vacuum pump


Dry-type screw vacuum pump is a suction and exhaust device which uses a pair of screw rods to rotate in the pump shell at high speed and reverse synchronously. The two screw rods are supported by bearing and installed in the pump shell after fine dynamic balance correction. There is a certain gap between the screw and the pump shell. Therefore, when the pump works, there is no wear between the screw and the screw. Wipe, smooth operation, low noise, working chamber without lubricating oil, therefore, dry screw pump can be pumped containing a large amount of steam and a small amount of dust in the gas occasion, higher limit vacuum, lower power consumption, energy saving, maintenance-free and so on. It is an upgrading product of oil seal / water ring / jet vacuum pump.

Dry screw vacuum pump.jpg


Technical parameters:


ModelUnitLG50LG70LG100LG150LG200LG300LG350
Suction Capacity50 Hzm³/hr18025043054072010801260
60 Hz21630036065085012961512
Ultimate Pressure50 Hzmbar0.02
60 Hz0.01
Motor power50 HzKw5.57.5111518.52222
60 Hz7.5111515222626
Rotary Speed50 HzRPM2900
60 Hz3550
Inlet diammm50657090100100100
Outlet diammm40405565656565
Lubricating oil consumptionL0.850.851.42222
Cooling water consumptionL/min2.52.62.83444
gal/min0.670.70.750.81.071.071.07
WeightKg295350480520680850850
NoisedB(A)68707072748484
Working temperature5~40
Max. Permissible humidity/90%



2. oil-free reciprocating vacuum pump


Vacuum pump, also called piston vacuum pump, relies on the reciprocating motion of the piston to periodically change the working volume of the pump cavity (cylinder). The structure of reciprocating vacuum pump is similar to reciprocating piston compressor. When working, the suction pipe is vacuumed and the exhaust pipe passes through the atmosphere. Reciprocating vacuum pump 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 rotor, each stage has two rotors, two rotors rotate in the opposite direction, suction port and pump cavity connected, pump cavity volume becomes larger and suction, when the rotor closed suction port suction end, after the pump cavity becomes smaller and compressed gas, when the exhaust opening after the pump cavity exhaust, exhaust port closed, then Exhaust is finished, so circulate.


4. oil-free scroll vacuum pump


The scroll disc of a scroll oil-free vacuum pump is a scroll disc structure formed by one or more involute spirals connecting one end with a plane. A pair of scroll disks composed of a static scroll disk and a moving scroll disk constitute the basic pumping mechanism of a scroll oil-free vacuum. For example, in a two-stage scroll oil-free vacuum pump, there are two directions corresponding to the fixed scroll disk, a rotating scroll disk located between the two scroll disks. The relative motion of the dynamic and static vortex disks forms a crescent-shaped vacuum chamber with constant volume change, which makes the gas be sucked in and discharged from the exhaust port, and completes the exhaust cycle.


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