Principle and selection of oil-free vacuum pump

The principle and selection of oil-free vacuum pump is provided by Shanghai Bayu, I hope to help you.

Oil-free vacuum pump working principle

The oil-free vacuum pump is a mechanical vacuum pump that can operate without any oil lubrication. The utility model has the advantages of simple structure, easy operation, convenient maintenance and no pollution to the environment. The oil-free vacuum pump has good durability and is a vacuum, compression, dual-purpose vacuum pump. It is a basic equipment with a wide range of applications to obtain vacuum.

The oil-free vacuum pump is the same as the general volumetric pump and consists of main parts such as stator, rotor, rotary vane, cylinder and motor. The rotor with the rotary vane is eccentrically mounted in the fixed cylinder. When the rotor rotates at high speed, the four radial sliding vanes in the rotor slot divide the pump chamber into four working chambers. Due to the centrifugal force, the rotary vane is closely attached. The cylinder wall separates the stator inlet and outlet ports, and starts to operate again and again to change the volume. The inhaled gas is discharged from the exhaust port to achieve the purpose of pumping.

The working principle of the oil-free vacuum pump is that the volume is changed, the air is taken in when the volume is large , and the air is discharged when the volume becomes small (the pressure becomes large ) , and the volume change is realized by the movable mechanical parts, and the requirement is small. Clearance and high precision, such as claw pumps.

The other is to rely on very high mechanical rotational speed to carry air molecules in a directed impact, such as a molecular pump. The third is a cryopump. On the cold surface close to absolute zero, almost all air molecules are frozen and trapped on the surface.

Oil-free vacuum pump selection

Compared with the oil pump, the oil-free vacuum pump has a low vacuum and a small pumping capacity, but is compact in size, easy to install, simple to maintain, easy to move, does not produce soot, and does not pollute the environment, especially in laboratories with higher requirements. It is also one of the most frequently equipped equipment in the laboratory.

Therefore, when purchasing an oil-free vacuum pump, first determine the degree of vacuum required to work. If the demand is high, the vacuum pump selected should be higher than the required vacuum. Otherwise, the vacuum requirement will not be met. Go to work requirements. The second is the pumping rate of the oil-free vacuum pump, which is slightly larger than the required pumping rate during the selection, so that it can better meet the needs. Finally, the gas extracted by the oil-free vacuum pump is corrosive, and the corroded gas will corrode the pump. Special materials must be used to meet the demand.

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