Screw rotor end face profile pair and construction method thereof

Abstract

The invention provides a screw rotor end face profile pair and a construction method thereof. The screw rotor end face profile pair comprises a pair of conjugated male rotor profile and female rotor profile, wherein each tooth profile in the male rotor profile and the female rotor profile is formed by six curves in a smooth connection mode; segmented curves of the male and female rotors are first-order continuous, rotor profiles formed by the segmented curves and envelope curves of the segmented curves are not interfered each other; and each curve comprises four segments of elliptical arcs, two segments of arcs and envelope curves of the arcs. According to the invention, tooth crests of driven edges of the male and female rotors are in an elliptical arc transition, and the tooth root and the tooth crest of a driving edge of the male rotor are in an elliptical arc transition, so that the construction of the profile is flexible, the machinable performance of the rotor can be improved, more importantly, the torque generated by the gas pressure on the driven edge of the female rotor can be adjusted, thus the smooth mesh of the rotors can be ensured; no pin tooth arcs are used, thus the meshing stability can be improved; the adjustable construction parameters are more, thus different performance requirements can be satisfied; the combination of the rotor tooth profile pair is diversified, thus the tooth profile pair can be applied to different occasions.

Description

technical field [0001] The invention belongs to the technical field of volume, and relates to an end face profile pair of a screw rotor and a construction method thereof. Background technique [0002] A pair of mutually meshing fixed-ratio drive helical conjugate male and female tooth profile pairs will form a gradual change in the closed volume when they rotate in their casing. According to the different design rotation directions, if the closed volume is gradually reduced, it can be used as a compressor. The closed volume is gradually increased and can be used as a vacuum pump. Under normal circumstances, the male rotor refers to the rotor with most of the tooth profile convex, on the contrary, most of the tooth profile is concave called the female rotor. At present, the shape and machining accuracy of a pair of intermeshing rotor face profiles are the key factors affecting the main performance indicators of the compressor, such as energy efficiency grade, displacement, v...

AI Technical Summary

Problems solved by technology

[0005] U.S. Patent No. US4412796 (application number: US19810296035) published on November 1, 1983 used the outer circular arc, elliptical arc and involute of the female rotor in turn on the driven side of the female rotor near the tooth top; July 17, 1984 The disclosed U.S. Patent No. US4460322 (application number: US19820452394) adopts an elliptical arc from the bottom of the tooth on the active side of the female rotor to the part near the tooth top; the U.S. Patent No. US 4890992 (application number: US19880184942) belongs to Taiwan Fusheng profile pair. It adopts a total of 4 segments to form a curve, which is its remarkable advantage. The envelope of the elliptical arc (the active side of the female rotor) has good flow linearity, but the disadvantage is that it is difficult to coordinate the strength and area utilization of the female rotor teeth; the Chinese patent No. CN 201221468Y announced on April 15, 2009 The rotor pair also uses an ellipse near the tooth top of the female rotor; the unique feature of Chinese Patent No. CN101435425A published on May 20, 2009 is that the outer circular arc is used on the active side of the female rotor near the tooth top, less than or equal to 1 / 4 elliptical arc and circular arc; the unique feature of Chinese Patent No. CN101545488A published on September 30, 2009 is that the female rotor is driven by the female rotor outer circular arc, circular arc and 1 / 4 ellipse and the arc envelope, the purpose of which is to simplify the design calculation and reduce the leakage channel

For example, the rotor profile pair patents that contain elliptical arcs all contain an elliptical arc, while the rotor tooth profile pair with higher performance requirements has reduced structural flexibility due to fewer structural variables.

[0010] Common feature 4 of existing patents: Generally, in an invention, the gear ratio of the rotor supported by the drawings in the description is fixed, and the degree of parameterization is insufficient from the perspective of disclosure

Images