Negative pressure vacuum pump

Roots vacuum pump (abbreviated as Roots pump) refers to a variable volume vacuum pump that is equipped with two blade shaped rotors that rotate synchronously in opposite directions inside the pump. There are small gaps between the rotors and between the rotors and the inner wall of the pump casing, but they do not touch each other.

Roots vacuum pumps have been tested for long-term operation in petroleum, chemical, plastic, pesticide, turbine rotor dynamic balancing, aerospace space simulation and other devices, so they should be vigorously promoted and applied in China. It is also widely used in industries such as petroleum, chemical, metallurgical, and textile. Vacuum pump accessories are used as vacuum pump mufflers for noise control of vacuum pumps.

The characteristics of Roots vacuum pump are: fast start-up, low power consumption, low operation and maintenance costs, high pumping speed, high efficiency, insensitivity to small amounts of water vapor and dust contained in the pumped gas, high pumping rate in the pressure range of 100~1 Pa, and the ability to quickly remove suddenly released gas. This pressure range is exactly between the oil sealed mechanical vacuum pump and the diffusion pump. Therefore, it is often connected in series between a diffusion pump and an oil sealed mechanical vacuum pump to increase the pumping volume in the intermediate pressure range. At this point, it is also known as a mechanical booster pump.