Roots blower working process

What is the whole working process of Roots blower? Low pressure gas enters the working chamber from the suction port on the fixed vortex disc and rotates in the plane with a small radius around the center of the stationary vortex disk.

The working chamber is enlarged or reduced accordingly, and the compressed air is finally discharged from the exhaust port in the center of the fixed scroll.

When machining the impeller, the numerical control equipment is used to ensure that the two impellers can keep a certain small clearance no matter where the two impellers rotate, and the gas leakage is within the allowable range.

The two impellers of Roots blower rotate in opposite directions. Because the gap between impeller and impeller, impeller and shell, impeller and wallboard is very small, the air inlet forms a vacuum state, and air enters the intake chamber under the action of atmospheric pressure.

Then, the two blades of each impeller form a sealing chamber with the wall plate and the shell. In the process of impeller rotation, the air in the inlet chamber continuously enters into the exhaust chamber through the seal chamber formed by two blades. Because the impellers in the exhaust chamber mesh with each other, the air between the two blades is squeezed out. In this way, continuous operation, air from the inlet to the outlet, this is the whole working process of Roots blower.


Roots blower is essentially the same as cam pump, but the rotor is roots type. It can transport liquids with viscosity of tens of thousands of centipoises. Roots blower mainly has two rotors with opposite rotation direction in the pump body, which are driven by a pair of synchronous gears. For Roots blower rotor, it is meshed with each other in the pump body, but with clearance. The size of the gap mainly depends on the viscosity of the liquid. If the viscosity exceeds a certain range, the clearance must be increased. Vacuum pump manufacturer reminds you:

1. The oil level of Roots blower is often checked. If it does not meet the requirements, it must be adjusted to meet the requirements. When roots pump is running, the oil level to the center of the oil mark shall prevail.

2. The oil change period of Roots blower is considered according to the actual use conditions and whether it can meet the performance requirements, etc., which is decided by the user. General new roots blower, pumping clean and dry gas, it is recommended to change oil once in about 100 hours. After the black metal powder is not seen in the oil, the oil change period can be appropriately extended in the future.

3. The roots blower often checks the oil quality, and if the oil is found to be deteriorated, the new oil shall be replaced in time to ensure the normal operation of Roots blower.

4. Generally, roots blower should be overhauled after working for 2000 hours. Check the aging degree of rubber seal, check whether the exhaust valve plate is cracked, clean the dirt deposited on the valve plate and exhaust valve seat. Clean the parts in the whole roots pump cavity, such as rotor, rotor, spring, etc. Generally, it is cleaned with gasoline and dried. The rubber parts can be dried with dry cloth after cleaning. When cleaning and assembling, handle with care to avoid bumping.

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