Helical gear pump with progressive interference between rotor an

Details Helical gear pump with progressive interference between rotor an Helical gear pump with progressive interference between rotor an

1991-08-15

1992-06-09

Vrablik, John J.

Rotary expansible chamber devices

Unlike helical surfaces on relatively wobbling rotating...

418178, F04C 2107, F04C 500

Patent

active

051202042

ABSTRACT:
A helical gear pump is described in which the geometry of the stator and rotor are modified such that the interference is significantly more at the locations of the minor diameter d than the locations of the major diameter D of the rotor. The rotor is preferably plasma coated with modified chromium oxide and the base metal of the rotor is advantageously machined so that in the region of locations of major diameter D, the thickness of the plasma coating is less and, in the region of the locations of minor diameter d, the thickness of the plasma coating is greater than in the remainder of the rotor while allowing the interference to be significantly more at the locations of the minor diameter d than at the locations of the major diameter D.

REFERENCES:
patent: 3380391 (1968-04-01), John
patent: 4104009 (1978-08-01), Chanton
patent: 4676725 (1987-06-01), Eppink
patent: 4773834 (1988-09-01), Saruwatari
patent: 4863359 (1989-09-01), Unterstrasser et al.

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