Mechanical face seals

Details Mechanical face seals Mechanical face seals

1992-12-18

1994-12-27

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277233, 277236, 29454, F16J 1536

Patent

active

053758544

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to mechanical face seals and to metal bellows for use therein.
A mechanical face seal generally comprises a rotary seal element and a stationary seal element usually in the form of rings in rubbing or running face-to-face sealing contact, the rotary seal ring surrounding and be secured directly or indirectly to a rotary element such, for example, as a rotary shaft and the stationary seal ring also surrounding the rotary shaft but being secured against rotation to a stationary element such, for example, as a housing within-which the shaft rotates.
One of the seal elements is movable axially of the shaft and means is provided between the housing and same to urge it into contact with the other seal element to provide the necessary sealing effect and to compensate for wear which occurs through use in the running faces of the seal rings.
The urging means may be a mechanical spring or a metal bellows, either stationary or rotatable depending upon which sealing element it is associated with, and the present invention is concerned with a mechanical face seal incorporating a metal bellows as the means for applying axial pressure and with the construction of the metal bellows per se.
The use of metal bellows in mechanical face seals has been known for many years and in various forms such, for example, as discs (washers) welded together at alternate inner and outer diameters, or a metal tube rolled or otherwise formed into corrugated or convoluted configuration.
The mechanical face seal of this invention is concerned with a metal bellows of the latter construction.
The mechanical face seal of the present invention employs a metal bellows whereof the crowns of the corrugations or convolutions have inner and outer radii of the same dimension.


SUMMARY OF THE INVENTION

According to the first aspect of the present invention there is provided a method of manufacturing a metal bellows comprising the steps of: pair of opposed edges defining an open axially extending seam; tube; corrugations or convolutions having inner and outer crowns of identical radii; and double-thickness annular end bearing and support face.
Preferably the method comprises the step of rolling the flat metal strip into a tubular configuration whereof the pair of opposed edges define a diagonally-extending axial open seam.
Preferably the method comprises the step of welding to each annular end bearing and support face an end ring at the outer diameter of the end ring and end face.
According to a second aspect of the present invention there is provided a metal bellows comprising a tubular body defining axially-spaced corrugations or convolutions having inner and outer crowns of identical radii, and, at each end, an annular, double-thickness, end bearing and support face.
Preferably the bellows is of rolled construction with an axial diagonally-disposed welded seam.
Preferably the bellows has welded to each annular end bearing and support face an end ring at the outer diameter of the end face and end ring.
According to a third aspect of the present invention there is provided a method of manufacturing a metal bellows comprising the steps of: pair of opposed edges defining an open axially extending diagonal seam; tube; and corrugations or convolutions having inner and outer crowns of identical radii.
Preferably the method comprises the steps of welding an end of the bellows to an inner diameter of an end ring, and the other end to an outer diameter of another end ring.
According to a fourth aspect of the present invention there is provided metal bellows comprising a rolled, diagonally-seamed tubular body defining axially-spaced corrugations or convolutions having inner and outer crowns of identical radii.
Preferably the bellows has one end welded to an outer diameter one end ring and its other end welded to an inner diameter of another end ring.
Preferably the bellows ends lap the inner and outer circumferential surfaces of the respective end rings and the respective welding connection is made at locatio

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