The new Roots pump in china includes a middle pump body, a front end cover and a rear end cover fixed and sealed on the middle pump body. The middle pump body is provided with two conjugated rotors that engage with each other. The conjugate rotor includes a two-blade rotor. And a three-blade rotor, the two-blade rotor and the three-blade rotor are provided with a convex surface and a concave surface that are conjugated to each other, and the two-blade rotor and the three-blade rotor have the number of convex surfaces opened on the concave surface. The number of faces is equal to the ratio of the pitch circle diameters of the two-blade rotor and the three-blade rotor; compared with the traditional Roots pump in china, the utility model improves the volumetric efficiency, the compression ratio reaches 42%, and the residual gas in each exhaust is reduced. to 12%; the linear structure of the two-blade rotor and the three-blade rotor can increase the contact area between the pump and the intermediate pump body, improve the sealing effect, help to further improve the compression ratio of the pump, and achieve higher exhaust pressure or vacuum It can be used as a Roots vacuum pump alone, with low production cost and suitable for wide application in industrial production.

The above is a brief introduction to the relevant knowledge about the new Roots pump in china.