vacuum roots pump

What is a roots pump?

This article is to introduce some basic knowledge about roots pumps including the working principle, features and so on.

Roots vacuum pump, also known as booster pump, is one of the vacuum pumps which are widely used in various industries where large pumping speed is required in the pressure range of 10 – 1000 Pa.

Different as other vacuum pumps, the roots pump is a dry vacuum pump that needs a backing pump (usually a dual stage rotary vane vacuum pump). It is allowed to start the roots pump after a certain ultimate pressure is achieved by the backing pump. Sometimes a single stage rotary vane pump is also used as a backing pump. In this case, the achieved ultimate pressure of the booster pump cannot be as good as that with a dual stage backing pump. To improve working efficiency, some roots pumps are designed to be started with the backing pump simultaneously, with the help of the bypass valve.

The working principle of the booster pump is very similar to the oil-sealed rotary vane vacuum pump. The vibration during operation is small thanks to the geometric symmetry of the 2 rotors. The pump operates completely contact-free due to the clearance between 2 rotors and that between rotors and pump housing. Consequently, a high speed operation is realized with very small friction.

roots pump structure

Simple Diagram of a Roots Pump Structure

Although booster pump is a dry pump without sealing oil in the pump chamber, the gearwheels and bearings have to be lubricated with oil. Therefore, there is the risk of oil contamination despite low possibility.

Roots pump is developed from the roots blower. Likewise, the oil-sealed rotary screw vacuum pump has a close relationship with rotary screw compressor. It can be used to replace roots pumps in some applications where the high ultimate pressure is not a must.

Colink, a TOP 3 Global Quality HVAC Vacuum Pump Manufacturer from China

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