Screw pump with improved efficiency of drawing fluid

Details Screw pump with improved efficiency of drawing fluid Screw pump with improved efficiency of drawing fluid

2007-08-09

2009-02-03

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Multistage

Interengaging rotary members

C418S201100, C418S201300

Reexamination Certificate

active

07484943

ABSTRACT:
A screw pump includes a housing and a pair of intermeshing screw rotors. The housing has an inlet port and an outlet port. Each rotor has a first portion whose lead angle decreases. The first portion and the housing form an inlet space and a pump space. Winding angle of the first portion has a first region and a second region. The first region is located in a predetermined range from the end on the first portion adjacent to the inlet port toward the outlet port. The second region is located adjacent to the first region. Reduction rate of the lead angle of the first portion in the first region is set smaller than that in the second region. The maximum lead angle of the first portion is set smaller than a lead angle which decreases at a constant rate in the first region and the second region.

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