Helical gear pump

Details Helical gear pump Helical gear pump

1997-11-18

2000-07-04

Nguyen, Hoang

Rotary expansible chamber devices

Unlike helical surfaces on relatively wobbling rotating...

418179, 4182069, F01C 110

Patent

active

06082980&

ABSTRACT:
Gear pump, or Moineau pump, comprising two helical gears one inside the other, the internal helical gear, which is rotary (the rotor) having one tooth fewer than the external helical gear, which is stationary (the stator), characterized in that the rotor and the stator are made of respective materials which have respective coefficients of thermal expansion which lead to respective expansions of the rotor and of the stator which are such that an approximately constant clearance is maintained between the rotor and the stator over a range of ambient temperatures spanning between about 15.degree. C. and about 300.degree. C.

REFERENCES:
patent: 3622254 (1971-11-01), LeBlanc, Jr.
patent: 4008015 (1977-02-01), McDermott
patent: 4128366 (1978-12-01), Sone
patent: 5772418 (1998-06-01), Tateno et al.
patent: 5797734 (1998-08-01), Kizer et al.
patent: 5876192 (1999-03-01), Follmer

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