Patent US3756673A successfully refreshed from Google Patents.
US3756673A
Expired / Lapsed
US
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Stuffing box for a rotating shaft
Assignee: Brown Boveri Sulzer Turbomaschinen AG
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Filing: 1972-06-30
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Granted: 1973-09-04
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Expires: 1992-06-30
Abstract
Abstract The stuffing box is provided with one or more bush seals in which at least one seal gap is formed about the shaft to provide a sealing means along with a bearing gap of wedge-shape to provide a hydrodynamic bearing. In addition, resilient elements are spaced about the circumferential periphery of the bush containing the bearing gap between the bush and casing to transmit forces from the shaft via the lubricating film to the casing.
Inventors
- 👤 R Strub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:16
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; F16C33/1075; F16C17/00; F16C17/02; F16C17/028; F16C17/03; F16J; F16J15/00; F16J15/44; F16J15/441
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A stuffing box for a rotating shaft comprising a casing; at least one bush seal mounted within said casing, said bush seal having a first section for defining a seal gap with the shaft for a barrier fluid flow and a second section for defining a wedge-shaped gap with the shaft in a circumferential direction of the shaft for a hydrodynamic load bearing film; and an annular resiliently-acting element between said casing and the shaft for radially supporting the shaft in said casing.
Claim 2
Dependent Claim
83 words
A stuffing box for a rotating shaft comprising a casing; at least one bush seal mounted within said casing, said bush seal having a first section for defining a seal gap with the shaft for a barrier fluid flow and a second section for defining a wedge-shaped gap with the shaft in a circumferential direction of the shaft for a hydrodynamic load bearing film; and an annular resiliently-acting element between said casing and the shaft for radially supporting the shaft in said casing.
Claim 3
Dependent Claim
57 words
A stuffing box as set forth in claim 1 having two serially aligned bush seals in said casing defining a chamber for a barrier fluid therebetween wherein one of said bush seals contains said seal gap and said wedge-shaped gap therein and wherein said seal gap is radially narrower than a substantial portion of said wedge-shaped gap.
Claim 4
Dependent Claim
40 words
A stuffing box as set forth in claim 1 wherein said annular resiliently shaped element includes a packing of concentrically and superjacently stacked shells betweeen said casing and said bush seal, each said shell deviating slightly from a cylindrical shape.
Claim 5
Dependent Claim
38 words
A stuffing box as set forth in claim 1 wherein said bush seal includes at least said wedge-shaped gaps and at least two pocket-shaped axially oriented indentations each communicating with a respective wedge-shaped gap to deliver fluid thereto.
Claim 6
Dependent Claim
43 words
A stuffing box as set forth in claim 1 wherein said bushing seal includes a plurality of rockable bearing segments in said second sectiOn, each said support being positioned to define a wedge-shaped gap with the shaft for a hydrodynamic load bearing film.
References Cited (Backward Citations)
US2956825A
Cited
US3617068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |