three lobes roots type vacuum pump

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three lobes roots type vacuum pump:

three lobes roots type vacuum pump is a vacuum pump without internal compression, the compression ratio is usually very low, so high, the vacuum pumps need to before. On a leaf of the pump cavity, reverse rotor synchronous push to move gas rotary vacuum pump and gas.

three lobes roots type vacuum  pump is mechanical vacuum pump with a pair of synchronous rotating shoe shaped rotor, the pump can not separate pumping gas, with front oil seal, water ring can be directly discharged to atmosphere.

Its structure and working principle of blower similar work the suction port and the vacuum container or vacuum pump is connected with the main system. This kind of vacuum pump rotor and rotor, the rotor and the pump shell is not contact each other, the gap is generally 0.1 to 0.8 mm; do not need to use oil lubrication. The rotor profile has a round arc, an involute, and a. The volume utilization of the involute rotor pump is high, and the machining accuracy is easy to be guaranteed, so the rotor profile is more open. Roots vacuum pump speed can be as high as 3450 ~ 4100 rpm; pumping rate is 30 ~ 10000 liters / sec (1 L =10-3 3 meters); ultimate vacuum: single stage is 6.5 * 10-2, 1 * 10-3, two-stage PA.