A twin-tooth twin-screw vacuum pump with a strictly sealed rotor line

Abstract

The invention provides a strict sealing type double-tooth double-screw-rod vacuum pump rotor molded line. One of rotors comprises a first addendum circular-arc segment ab, a first involute segment bc,a first point engaging epicycloid segment cd, a first dedendum circular-arc segment de, a second point engaging epicycloid segment ef, a second involute segment fg, a second addendum circular-arc segment gh, a third involute segment hi, a third point engaging epicycloid segment ij, a second dedendum circular-arc segment jk and a fourth point engaging epicycloid segment ka which are all sequentially connected end to end, and the other rotor has the same structure. In the rotating process, the molded lines are continuous everywhere, one to more engaging points exist under each corner, power consumption is reduced, and the limit vacuum degree is improved. A double-screw-rod vacuum pump adopts the molded line and can make dynamic balance performance of the female rotor and the male rotor be improved, no leakage triangle occurs in the running process, and the strict sealing type double-tooth double-screw-rod vacuum pump rotor molded line has the advantages that vulnerable parts are less, the structure is compact, the pumping rate is high, no surge occurs, and vibration noise is low.

Description

technical field [0001] The invention belongs to the field of mechanical engineering design and relates to a double-tooth twin-screw vacuum pump with strictly sealed rotor lines. Background technique [0002] Dry twin-screw vacuum pump is a positive displacement oil-free vacuum pump, which is mostly used to obtain a dry, low-pollution high-vacuum environment, and has a wide range of applications in modern industry. It inherits many advantages such as long mechanical life of the screw, forced suction and exhaust, no wearing parts, reliable operation, small vibration, low noise, stable operation, and no surge phenomenon, 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. The selection of the rotor end profile directly affects the structure of the rotor, thereby affecting the processing method and operating performance of the vacuum pump. In order to facilitate the processing of the traditiona...

AI Technical Summary

Problems solved by technology

However, the asymmetry of the single-tooth structure will seriously affect the dynamic balance performance of the screw rotor, resulting in the disadvantages of increased energy consumption and increased noise

[0004] Compared with the single-tooth structure, the dynamic balance performance of the screw rotor with double-tooth structure will be greatly improved, and the completely symmetrical double-tooth structure will cause the working chamber to be unsealed, which will seriously affect the working performance of the vacuum pump

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