F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
230/39
F04D 17/06 (2006.01)
Patent
CA 1268747
ABSTRACT OF THE DISCLOSURE Screw rotors having nonsymmetrical tooth profiles and used in a screw-type rotary compressor or expander. The tooth profile of the female rotor is formed such that a line (H2-A2) is formed by a generated curve of a point A1 of the male rotor; a line (A2-B2) is formed by a circular arc having a point O7 as the center of the arc and a radius R7; a line (B2-C'2) is formed by an envelope developed by a circular arc (B1-C1) of the male rotor; a portion between points D'2 and E2 is formed by a circular arc having a point O1 as the center of the arc and a radius R1; a line (C'-D') is formed by a line smoothly connecting the lines (B2-C'2) and (D'2-E2); a line (E2-F2) is formed by a circular arc having a point O2 as the center of the arc and a radius R2; and a line (F2-G2) is formed by a circular arc having a point O8 as the center of the arc and a radius R8. The tooth profile of the male rotor is formed such that a line (H1-A1) is formed by a generated curve of a point H2 of the female rotor; a line (A1-B1) is formed by an envelope developed by the arc (A2-B2) of the female rotor; a line (B1-C1) is formed by a circular arc having a point O4 as the center of the arc and a radius R4; a line (C1-D1) is formed by a circular arc having the rotating center of the male rotor as the center of the arc and a radius R5; and lines (D1-E1), (E1-F1) and (F1-G1) are generated by arcs (D2-E2), (E2-F2) and (F2-G2) of the female rotor tooth profile, respectively. The screw rotors prevent abnormal noise and vibration of the compressor or expander and can be manufactured easily.
478391
Kanai Junichi
Maehara Atsushi
Tanaka Masanori
Hokuetsu Industries Co. Ltd.
Smart & Biggar
LandOfFree
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