Roots Vacuum Pump Working Principle

Working principle

The working principle of a roots vacuum pump is similar to that of a roots blower. Due to the continuous rotation of the rotor, the pumped gas is sucked from the air inlet into the space between the rotor and the pump casing, and then discharged through the air outlet.

Since the space is fully enclosed after suction, there is no gas compression and expansion in the pump cavity. However, when the top of the rotor turns over the edge of the exhaust outlet and the space communicates with the exhaust side, due to the higher gas pressure on the exhaust side, a part of the gas rushes back into the space, causing the gas pressure to suddenly increase. When the rotor continues to rotate, the gas is discharged out of the pump.

 

Performance characteristics

Large pumping speed in a wide pressure range.

Quick start and immediate working.

Insensitive to dust and water vapor that contained in the pumped gas.

The rotor does not need to be lubricated, and there is no oil in the pump cavity.

The vibration is small, and the rotor dynamic balance condition is good, there is no exhaust valve.

The driving power is small, the mechanical friction loss is small.

The structure is compact, the land area is small.

The operation and maintenance cost is low.

Therefore, roots pumps are widely used in metallurgy, petrochemical, paper making, food, and electronic industries.

 

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