Double-screw vacuum pump rotor profile

Abstract

Disclosed is a double-screw vacuum pump rotor profile. One rotor comprises a first involute ab, an addendum circle arc action bc, a point engagement cycloid cd, a second involute de, a first point engagement epicycloid ef, a dedendum circle arc section fg and a second point engagement epicycloid ga which are sequentially connected in an end-to-end mode, and the other rotor has the same structure,wherein a point a is located on the pitch circle, during rotation, the point a is engaged with a cycloid section c'd', the involute ab is engaged with the involute d'e', a point b is engaged with an epicycloid section e'f', the addendum circle arc section bc is engaged with a dedendum circle arc section f'g', a point c is engaged with an epicycloid section g'a', the cycloid section cd is engaged with a point a', the involute de is engaged with an involute a'b', the epicycloid section ef is engaged with a point b', the dedendum circle arc section fg is engaged with the addendum circle arc section b'c', and the epicycloid section ga is engaged with a profile point c'. The structures of the two rotors are the same, and the machining cost is low.

Description

Technical field [0001] The invention belongs to the field of mechanical engineering design, and specifically relates to a rotor profile of a twin-screw vacuum pump. Background technique [0002] The dry twin-screw vacuum pump is a positive displacement oil-free vacuum pump, which is mostly used to obtain a dry, low-polluting high vacuum environment and has a wide range of applications in modern industries. It inherits many advantages such as long mechanical life of the screw, forced suction and exhaust, no wearing parts, reliable operation, low vibration, low noise, stable operation, no surge, etc., and has become a research hotspot in the field of vacuum pumps. [0003] The core components of a twin-screw vacuum pump are two rotors, and the selection of the rotor end profile directly affects the structure of the rotor, thereby affecting the processing mode and operating performance of the vacuum pump. In order to facilitate the processing of the traditional vacuum pump profile, t...

AI Technical Summary

Problems solved by technology

In order to facilitate the processing of the traditional vacuum pump profile, the two rotors often choose the same profile, but because the two rotors rotate in opposite directions during operation, the resulting two rotors will be two different rotors with different rotation directions. The two rotors need to be processed and manufactured separately, which increases the processing cost

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