Patent ID: 6913452
Filing Date: 2005-07-05
Classification: F01C

Abstract:
1. A screw rotor device for positive displacement of a working fluid, comprising: a housing having an inlet port at a first end and an outlet port at a second end and a pair of cylindrical bores extending therebetween; a female rotor having a helical groove, wherein said female rotor is rotatably mounted within said first end and said second end of said housing and has a periphery in close tolerance with said housing; and a male rotor having a helical thread, said helical thread having a profile comprising a minor diameter arc and a tooth segment radially extending to a major diameter arc, wherein said male rotor is rotatably mounted within first end and second end of said housing and counter-rotates with respect to said female rotor, wherein said helical thread intermeshes in phase with said helical groove and said male rotor is in close tolerance with said housing, and wherein said helical thread and said helical groove bound a space within said cylindrical bores, seal the working fluid within in said housing, and transition between meshing with each other and sealing around said housing while maintaining said sealing of the working fluid in said space.