A New Design of the Tooth Profile for Single Screw Compressors
The wear of star wheel teeth is an importance issue in the single screw compressor. In order to enhance the wearresistance of star wheel teeth, some new profiles of the meshing pair were proposed to replace the currently used straight line envelope profile, such as single column envelope, multi-straight line (or multi-column) envelope. In this paper, a curved surface of the tooth flank is suggested. The groove flank is the envelope surface corresponding to the curved surface of the tooth flank. Section profile of the new tooth flank is a curved line, which could be elliptical, hyperbolic or involute. During the tooth meshing with the groove, the contact line between the tooth flank and the groove flank could move back and forth in the whole area of the tooth flank. This design is expected to improve the lubricating between the tooth flank and the groove flank, and to prolong the service life of the single screw compressor. Geometric and kinematic investigation of the star wheel and the screw rotor is established. And a new designed tooth flank of the meshing pair is introduced in this paper. Numerical control high-velocity cutting technology is suggested to fabricate the new star-wheel and the screw rotor.
Potential of the single-screw compressor
Resume Le compresseur monovis pourrait devenir le type dominant de compresseur pour des puissances de 50 a 1500 kW. II est susceptible d'un rendement energetique eleve parce que les pertes duez aux fuites, au frottement et aux transfers de challeur pourraient etre fortement reduites. On decrit a cet effet un nouveau type de satellite. On peut obtenir un cout peu eleve parce que le compresseur est de faible encombrement, que le nouveau satellite est de fabrication moins couteuse, que les paliers peuvent etre simplifies et que le corps peut devenir un simple reservoir sous pression.
Profile generation and analysis for a pp-type single-screw compressor
The precision design of the screw rotor and the gate rotor is the foundation to promoting the operational reliability of a pp-type single-screw compressor. The purpose of the present paper is to determine the mathematical model of a single-screw rotor with conical gate rotors. A simple method by gear theory to determine the profiles of a screw rotor and a gate rotor have been studied. The mathematical model of the screw rotor is defined as the envelope to the family of gate rotor surfaces. As an example, the pp-type single-screw compressor for a compressor ratio of 11:6 is demonstrated with the aid of the proposed mathematical model. Based on the developed geometrical models, the contour of von Mises stress distributions of a screw rotor and four gate rotors on the proposed mechanism is presented. Using rapid prototyping (RP) and manufacturing technology, the proposed pp-type single-screw compressor with conical teeth of a gate rotor was designed. The RP primitives provide an actual full-size physical model that can be analyzed and used for further development. The results from these mathematical models should have practical applications in the design of pp-type single-screw mechanisms.