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Energies 2020, 13, 6586 9 of 26 Litvin et al. [28] gave the vector expression of the rotor profile and studied the characteristics of the rotor profile and the influence of the inter rotor contact clearance on the performance of the compressor. (2) The application of computer-aided design in the design of profile Recently, computer technology has played a very important role in the optimization of the typical profile and the development of the new profile. Application of computer technology in rotor profile design not only improves the design efficiency, shorten the design time and improve the design precision, but also predict the performance of the rotor. He Xueming et al. [29] summarized the general equation, general fitting equation, conjugate line and meshing line equation of rotor line based on the comprehensive analysis of the common profile equation and the conjugate relation of screw compressor rotor. Through the use of general equations and the corresponding supporting software, three tooth shapes of JB, SRM and HZ-3 were designed and plotted. A complete set of screw rotor design and calculation software (SCCAD) was developed by Xing et al. [30] of Xi’an Jiao Tong University’s compressor teaching and research office. The software can automatically complete the design of the rotor profile, calculation of the geometry of the rotor and the prediction of power and thermal performance. Based on the analyses of some typical rotor profiles and gear engagement theory, He Xueming et al. [31] introduced a method to generate the rotor profiles by using media rack. A new type of twin-screw compressor rotor profiles was designed by means of optimization method. Calculation and intermeshing behavior simulation were done with the software Matlab and Pro/Engineer. (3) The reverse design of rotor profile Most of the traditional design method of profile belongs to a kind of top-down design, but this method requires a significant amount of effort on the selection of curves and experimental verification, and the computing process is very complex. Through practical verification, the reverse design not only completes the optimization design of products based on the digital model but also avoids some detours in the top-down design, and thus is able to shorten the design cycle and reduce the design cost. The data acquisition method and processing technology of profile were studied by Jia Chunyang [32]. The reverse design method of the rotor profile— Non-Uniform Rational B-Splines (NURBS), was put forward based on the reverse design idea after the data fitting of the screw rotor profile, which provided a theoretical basis for the reverse design of the rotor profile. From the meshing line of the twin-screw compressor rotor of view, He Xueming et al. [31] introduced the method of meshing line in detail and deduced that rotor profile of yin-yang rotor form the meshing line through meshing and coordinate transformation. Shi Guo-jiang et al. [33] based on Microsoft Visual 2010 and its Microsoft Foundation Classes (MFC) module, combined with the graphics display function of OpenGL, and on the basis of the previous design ideas for innovation, designed a set of twin-screw compressor yin-yang rotor type line design system (TSD). 2.4. Research Status of the Machining of the Screw Rotor Processing accuracy of the screw rotor has a significant influence on the leakage gap, seal, friction of the screw mechanism. The requirement of screw rotor for machining accuracy is very high. In the early stage of the development of screw mechanism, due to the limitation of the machining methods and processing equipment, it is difficult to fabricate even new line with good performance. The mechanical performance and efficiency of the screw mechanism was low, which seriously impeded the development of the screw machine. With the development of the Computer Numerical Control (CNC) machine technology, professional screw rotor processing equipment has successfully been developed, and corresponding new screw processing methods have been proposed, so the accuracy and performance of the screw rotors have obtained the significant enhancement.PDF Image | Development and Application of the Twin Screw Expander
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