Rotary reciprocating seals with internal metal band
AssigneeBal Seal Engineering, Inc.
InventorPeter J. Balsells
Life of this patent
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Abstract
A seal assembly is provided for static, rotary and reciprocating sealing between the shaft and the housing. The seal assembly includes a ring seal in the shape of an annulus having a body portion with an inside flange and an outside flange extending longitudinally therefrom. A spring is disposed between the flanges for radially biasing the flanges from one another to effect sealing between the shaft and the housing and a circular band disposed between the spring and the outside flange is provided for maintaining radial force against the outside flange to retain the ring within the housing and provide static sealing between the ring seal and the housing despite shrinkage of the fluoropolymer seal ring.
Claims23
A seal assembly suitable for static, rotary and reciprocating sealing between a shaft and a housing, said seal assembly comprising:
- a seal ring formed from a fluoropolymer in the shape of an annulus having a body portion with an inside flange and an outside flange extending axially therefrom;
- spring means, disposed between the flanges, for radially biasing the flanges from one another to cause sealing between the shaft and the housing;
- and
- circular band means, disposed between the spring means and the outside flange, for providing an outward radial force to retain the seal ring within the housing without rotation thereof, and provide static sealing between the seal ring and the housing despite shrinkage of the fluoropolymer seal ring, the band means having sufficient flexibility to enable transmission of spring force therethrough to enable sealing between the outside flange and the housing of said spring means.
A seal assembly suitable for providing static, rotary and reciprocating sealing between a shaft and a housing, said seal assembly comprising:
- a seal ring formed from a fluoropolymer in the shape of an annulus having a body portion with an inside flange and an outside flange extending axially therefrom;
- spring means, disposed between the flanges, for radially biasing the inside flange against the shaft to cause sealing therebetween;
- and
- circular band means, disposed between the flanges and against the outer flange and spring means, for providing an outward radial force against the outside flange in order for both to retain the seal ring within the housing and for causing a static and dynamic seal between the outside flange and the housing, despite shrinkage of the fluoropolymer seal ring, the band means having sufficient stiffness to prevent deflection thereof by the spring means.
A seal assembly suitable for providing rotary and reciprocating sealing between a shaft and a housing, said seal assembly comprising:
- a seal ring formed from a fluoropolymer in the shape of an annulus having a body portion with an inside flange, center flange and outside flange extending axially therefrom;
- spring means, disposed between the inside and center flanges for radially biasing the inside flange against the shaft to cause sealing therebetween;
- and
- circular band means, disposed between the outside and center flanges, for providing an outward radial force to retain the seal ring within the housing and cause sealing between the outside flange and the housing despite shrinkage of the fluoropolymer seal ring.
Dependencies are inferred from the claim text.