Membrane seals

Details Membrane seals Membrane seals

2005-02-22

2005-02-22

Nguyen, Ninh H. (Department: 3745)

Rotary kinetic fluid motors or pumps

Including thermal expansion joint

Resilient

C415S174200, C277S626000, C277S644000

Reexamination Certificate

active

06857849

ABSTRACT:
A membrane seal includes a pair of confronting annular sealing grooves. A first annular sealing member is received in one of the oppositely facing sealing grooves and a second annular sealing member is received in the other of the oppositely facing sealing grooves. The first and second sealing members are sealably connected together by an annular membrane. A pressure difference across the membrane forces the first and second sealing members into contact with a side wall of each of the oppositely facing sealing grooves to effect a seal. Known sealing members have a circular cross-section but in the present invention at least one of them has an oval cross-section. The oval cross-section gives the first and/or second sealing member(s) a larger zone of contact with the oppositely facing sealing groove(s). This reduces the amount of wear on the first and/or second sealing member(s) and produces a better seal.

REFERENCES:
patent: 4188037 (1980-02-01), Abbes et al.
patent: 5158430 (1992-10-01), Dixon et al.
patent: 5624227 (1997-04-01), Farell
patent: 5634766 (1997-06-01), Cunha et al.
patent: 5716158 (1998-02-01), Hahn et al.
patent: 5823741 (1998-10-01), Predmore et al.
patent: 5975844 (1999-11-01), Milazar et al.
patent: 6561522 (2003-05-01), Radelet et al.

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