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The third-stage rotor profile is a new asymmetrical profile, and it is also called a high efficient new tooth type. The design basically adopts circular, parabolic, elliptical curves and abandoned points, straight lines, cycloid, and so on. So, the rotor tooth surface is changed from “line seal” to “surface seal”, which effectively improves the sealing ability, thereby improving the performance of Etnheregisecs r2e0w20,e1x3,p6a5n86der. Representative lines of this profile are GHH, SRM-D, Hokuetsu and X31 an8doXf 2362 profile developed by Xi’an Jiao Tong University. Figure 6c,d show GHH and Hokuetsu profile. (a) (b) (c) (d) Figure 6. The typical profiles of each stage of the development of the profile: (a) symmetrical circular Figure 6. The typical profiles of each stage of the development of the profile: (a) symmetrical circular arc profile; (b) unilateral asymmetrical cycloid; (c) GHH profile; (d) Hokuetsu profile. arc profile; (b) unilateral asymmetrical cycloid; (c) GHH profile; (d) Hokuetsu profile. The second stage is an asymmetric profile. This profile is composed of points, lines and cycloid lines in different connection order. The contact type of the unsymmetrical tooth-shaped rotor is surface contact, which not only highly reduces the stress of the contact surface during torque transmission but also greatly reduces the area of the leakage triangle. The typical representative of asymmetric lines has SRM-A profile and unilateral asymmetrical cycloid, as shown in Figure 6b. The third-stage rotor profile is a new asymmetrical profile, and it is also called a high efficient new tooth type. The design basically adopts circular, parabolic, elliptical curves and abandoned points, straight lines, cycloid, and so on. So, the rotor tooth surface is changed from “line seal” to “surface seal”, which effectively improves the sealing ability, thereby improving the performance of the screw expander. Representative lines of this profile are GHH, SRM-D, Hokuetsu and X31 and X32 profile developed by Xi’an Jiao Tong University. Figure 6c,d show GHH and Hokuetsu profile. 2.3.2. Research on the Rotor Profile of Screw Machine To measure the efficiency of the rotor profiles, there are the following criteria: (1) small contact stress; (2) good torque transfer performance and oil film forming ability; (3) shorter contact lines; (4) large volume cavity; (5) easy processing and manufacturing. The above five are not only the criterion of rotor profiles efficiency, but also the principle of rotor profiles design. Based on the above design principles, many scholars apply new methods, new thoughts and new tools for optimization and redesign of the rotor profile. (1) The application of the new method to the study of rotor profile By analyzing the meshing line of the rotor, D. Zaytsev et al. [26] proposed a new method for generating the rotor profile. Furthermore, requirements of the meshing line were listed and an analysis was carried out to obtain optimal profile design. The feasibility of this method is verified as well. Stosic N et al. [27] adopted mutual engagement principle of gear in the design of screw rotor profile, thus they successfully developed the spiral rotor of “N” line series. The series have the characteristics of larger flow area, smaller leakage triangle, and smaller internal friction. In addition, the “Scorpath” software was successfully designed and developed.PDF Image | Development and Application of the Twin Screw Expander
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