Patent US4305592A successfully refreshed from Google Patents.
US4305592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas seal bushing
Assignee: IMO Industries Inc
•
Filing: 1979-10-23
•
Granted: 1981-12-15
•
Expires: 1999-10-23
Abstract
Abstract An improved pressure seal assembly for rotary machinery. The assembly utilizes a buffer oil flowing through a seal ring surrounding the rotating shaft of the machinery. The seal ring includes a plurality of openings about its periphery to pass the oil through the ring to a number of bearing pads. The oil serves to cool, lubricate, seal and damp the seal ring. The assembly reduces oil loss to the pressurized environment to a minimum.
Inventors
- 👤 Haakon O. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:57
CPC Classifications
B; B63; B63H; B63H23/00; B63H23/32; B63H23/321; F; F16; F16J; F16J15/00; F16J15/16; F16J15/40; F16J15/406; F16J15/44; F16J15/441; B63H2023/327; Y; Y10; Y10S; Y10S277/00; Y10S277/916; Y10S277/927; Y10S277/93
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A pressure seal assembly, utilizing an external supply of a fluid barrier such as oil at a pressure differential from that of the pressure to be sealed, for a rotating shaft comprising: a one-piece stationary ring surrounding said shaft; said ring including a portion proximate to the highpressure side of said shaft having windback grooves on the surface adjacent to said shaft to direct said fluid barrier in a predetermined direction; said ring including a portion with at least one bearing pad proximate to the low-pressure end of said shaft; said ring having an annular space disposed between said windback grooves and said bearing pad; and a plurality of channels in said ring adjacent to said windback grooves communicating between said external supply of said fluid barrier and said annular space, said fluid barrier first flowing through said channels to cool said windback grooves, thereafter passing into said annular space to flow towards said windback grooves and said bearing pad, said windback grooves resisting the flow of said fluid barrier.
Claim 2
Dependent Claim
170 words
A pressure seal assembly, utilizing an external supply of a fluid barrier such as oil at a pressure differential from that of the pressure to be sealed, for a rotating shaft comprising: a one-piece stationary ring surrounding said shaft; said ring including a portion proximate to the highpressure side of said shaft having windback grooves on the surface adjacent to said shaft to direct said fluid barrier in a predetermined direction; said ring including a portion with at least one bearing pad proximate to the low-pressure end of said shaft; said ring having an annular space disposed between said windback grooves and said bearing pad; and a plurality of channels in said ring adjacent to said windback grooves communicating between said external supply of said fluid barrier and said annular space, said fluid barrier first flowing through said channels to cool said windback grooves, thereafter passing into said annular space to flow towards said windback grooves and said bearing pad, said windback grooves resisting the flow of said fluid barrier.
Claim 3
Dependent Claim
44 words
A seal assembly as claimed in claim 1, further including a stationary housing surrounding said ring and defining an annular opening around said ring, said fluid barrier being routed to said annular opening around said ring to thereby damp said ring against induced vibration.
Claim 4
Dependent Claim
46 words
A seal assembly as claimed in claim 2 wherein said annular opening around said ring includes dam means so that the fluid barrier flow around the outside of said ring is relatively small compared to the fluid barrier flow through said apertures and said bearing pads.
Claim 5
Dependent Claim
33 words
A seal assembly as claimed in claim 1, wherein said portion of said ring including said bearing pads includes a plurality of spaced apart axial grooves to define a plurality of bearing pads.
Claim 6
Dependent Claim
34 words
A seal assembly as claimed in claim 1, further including a stationary housing surrounding said ring, said housing including a projection abutting said ring to prevent axial motion of said ring along said shaft.
Claim 7
Dependent Claim
18 words
A seal assembly as claimed in claim 5, further including means for biasing said ring againt said projection.
References Cited (Backward Citations)
GB585898A
Cited
US2956825A
Cited
BE531064A
Cited
GB857943A
Cited
US3047299A
Cited
AT231771B
Cited
FR1476705A
Cited
US3462159A
Cited
US3467396A
Cited
US3575424A
Cited
US3756673A
Cited
US3905605A
Cited
US3973779A
Cited
US3937477A
Cited
US4010960A
Cited
US4183540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |