IMPROVED MECHANICAL SEAL WITH FLEXIBLE METAL DIAPHRAGM

Title:

IMPROVED MECHANICAL SEAL WITH FLEXIBLE METAL DIAPHRAGM

Document Type and Number:

WIPO Patent Application WO1996031716

Kind Code:

A3

Abstract:

A mechanical end face seal for sealing between a housing and a relatively rotating shaft which seal includes a pair of relatively rotating annular rings (218,220) having seal faces (219,221) in sealing contact with each other to define a seal interface, with one of the rings adapted to be secured to said shaft for rotation therewith, and the other fixed relative to the housing and one being axially movable toward the other. A generally annular flexible metal diaphragm (275) secured between the axially movable ring and either the housing or shaft includes a generally radial disc-like central portion which defines a plurality of annular convolutions formed by protrusions extending in opposite axial directions. The diaphragm is pressed onto a cylindrical surface (237) on the ring at about the center of mass (M-M) of the ring. The surface includes a coating of a compound including PTFE, grit and a binder. In one form, the seal utilizes a second seal ring (218) pressed into fluid tight relation with its associated carrier (240) at about the center of mass (M-M) of the ring. In another form, a seal ring is provided which is secured to its associated carrier in fluid tight relation utilizing welding techniques. The associated methods are disclosed.

Inventors:

SADOWSKI RICHARD

Application Number:

PCT/US1996/003923

Publication Date:

November 21, 1996

Filing Date:

March 21, 1996

Export Citation:

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Assignee:

CRANE JOHN INC (US)

International Classes:

F16J15/34; F16J15/36; (IPC1-7): F16J/

Foreign References:

US1561426A	1925-11-10
US1780248A	1930-11-04
US2000341A	1935-05-07
US2014932A	1935-09-17
GB190606115A	1907-01-10
GB548051A	1942-09-23
AU144296B2

Other References: