Roots blower is a positive displacement blower. It is the use of two or three vane rotor relative movement in the cylinder to compress and transport gas rotary compressor. The blower is simple in structure and convenient in manufacture. It is suitable for gas conveying and pressurizing in low pressure occasions, and can also be used as a vacuum pump. Now the vast majority of the market is the Clover blower.

(1) Positive displacement blower has the characteristics of forced gas transmission. Under the condition of a certain speed, the flow rate is also certain (with little change in pressure). Even in the small flow area, it will not surge like the centrifugal blower, and it has relatively stable working characteristics.

(2) As a rotary machinery, there is no reciprocating mechanism, no air valve, less wearing parts, so the service life is long, and the dynamic balance is good and can operate at a higher speed, and no heavy foundation is required. There are many times a week of operation suction and exhaust, compared with the piston compressor, the airflow speed is more uniform, there is no need to set the gas tank.

(3) There is a gap between the impeller, the impeller and the housing and the wall panel, and the operation is not like the screw and slide compressor that needs oil lubrication, so it can ensure that the conveyed gas does not contain oil, and there is no need to use gas-oil separator and other auxiliary equipment. Due to the presence of gaps and the absence of air valves, it is also safer to transport gases containing dust or droplets.

(4) There is no internal compression process, which theoretically consumes more compression work than those blowers with internal compression process. However, in addition to synchronous gears and bearings, there is no other mechanical friction, so the mechanical efficiency is high. In particular, the large Roots blower has high volumetric efficiency and high adiabatic efficiency.

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