Design and Improvement of Curved Envelope Meshing Pair Profile of Single Screw Compressor

Abstract In recent years, the wear problem of the wheel tooth in the single screw compressor (SSC had been solved due to the development and application of various envelope profiles. Among these profiles, the curved envelope profile shows performance advantages, which displays great application potential in the fields of high-temperature heat pump, steam compression, etc. However, SSC with curved envelop profile still faces the problem of incomplete design method, large leakage clearance, difficult processing and meshing pair interference under extreme conditions. Therefore, aiming at solving these problems, a coupling profile design method for the curved envelope meshing pair of the SSC was presented and studied. The profile equation of curved envelop meshing pair of a SSC with an ellipse profile as the characteristic line was established. The method of using standard tooth width was proposed for the quick geometric design of the SSC. The coupling profile design of the star wheel tooth angle and the groove bottom angle with variable diameter circular arc was invented. The equation of the transition arc surface of the bottom angle of the groove and the angle of the star wheel tooth was derived. It provided a theoretical basis for the design and improvement of meshing pair with curved envelop profile.