Oil-free dry screw compressor rotor

Abstract

The invention relates to an oil-free dry screw compressor rotor molded line. In the invention, a double-edge asymmetric molded line is adopted. Eight sections of molded lines respectively form anode rotor end-surface molded lines and cathode rotor end-surface molded lines; and the anode rotor end-surface molded line series and the cathode rotor end-surface molded series of a screw compressor are formed by the same center distance A as well as anode rotors and cathode rotors of different sizes. According to the double-edge asymmetric molded line disclosed by the invention, the rotor has the advantages of short contact line, small leaked triangle, large overcurrent area, streamline-shaped rotor molded line and the like. The screw compressor and the screw vacuum pump adopting the oil-free dry screw compressor rotor molded line can be widely applied to fields, such as air compression, refrigeration, air conditioning, technical gas compression, pneumatic transmission, vacuum application and the like, and occupy most market shares under the vacuum working condition of immediate and lower pressure.

Description

technical field [0001] The invention relates to twin-screw compressors, in particular to a new type of thread suitable for oil-free dry screw compressor rotors. Background technique [0002] The quality of the end surface profile of the screw compressor will directly affect the performance of the screw compressor, such as sealing and efficiency. At present, the popular profiles on the market include GHH profiles, Hitachi profiles, and SRM profiles, all of which have their own characteristics. [0003] Since the twin-screw compressor came out in the 1940s, it has developed rapidly and has been widely used in many fields. The update and development of the screw rotor profile is the main driving force for the development of twin-screw compressors. In the patent documents of various countries, screw rotor profiles emerge in endlessly, all for the purpose of improving efficiency and performance. The design of the screw rotor profile should usually consider the following factor...

AI Technical Summary

Problems solved by technology

[0009] In Chinese patent documents 200410204539.3, 200710171655.5, and 200810204539.3, for b on the female rotor 2 c 2 The curves all adopt arc pin-tooth curves (the arc with the center at node P), and its disadvantages are: the meshing and disengagement of the male and female rotors are not stable, and there are instantaneous changes in airflow pressure, resulting in noise and vibration

[0010] In order to improve the tightness between the rotor and the inner wall of the cavity, Chinese patent document 200710171655.5 proposes to set an elliptic curve on the tooth top of the male rotor. The disadvantage is that the contact between the rotor and the inner wall of the cavity is still a point on the profile line of the end surface. Instead of a line, the seal is not optimal

Although Chinese patent document 200410204539.3 proposes to add a section of circular arc on the tooth top of the male rotor, there is no specific implementation plan, so it is difficult to implement

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