Positive displacement vacuum pump Claw vacuum pump is not only a kind of positive displacement vacuum pump, but also a dry vacuum pump.Claw vacuum pump, like roots vacuum pump and screw vacuum pump, is a non-contact dry vacuum pump. In general, in order to achieve a certain compression ratio, rotational speed and dynamic balance, claw vacuum pump is usually composed of multi-stage claw rotor in series or roots rotor and multi-stage claw rotor in series. At present, three-stage claw rotor and one-stage roots rotor are commonly used, or four-stage claw rotor is connected in series. The performance of roots plus claw type is generally better than that of claw type vacuum pump.In multi-stage claw vacuum pump, according to the form of rotor, phase difference and diaphragm, it can be divided into spiral type, anti claw type and spiral anti claw type, and their performance is also different.For claw type vacuum energy, the higher the rotating speed, the greater the compression ratio. In general, the speed of claw vacuum pump is 3000r / min, and the limit pressure is 1-10pa.Industrial craneRoots BlowersRoots Vacuum Pump