US3825311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed rotating machines
Assignee: Honeywell Normalair Garrett Holdings Ltd
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Filing: 1973-01-17
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Granted: 1974-07-23
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Expires: 1993-01-17
Abstract
Abstract Bearing seal means for high speed rotating machines which have a rotatable assembly supported by bearings and enclosed lubricating means therefor. The seal means provides ducts directing pressurised air towards the rotating shaft assembly outboard of both ends of the enclosure. The pressurised air bleeds from the ducts adjacent to the shaft assembly to pressurise a region between the seal means and the outboard faces of the enclosure to prevent oil seepage from the enclosure. Air bleed from the ducts is also permitted in an outboard direction and can provide cooling across the back of a compressor wheel.
Inventors
- 👤 B Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:48
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/72; F16C33/74; F01; F01D; F01D25/00; F01D25/18; F01D25/183; F02; F02C; F02C6/00; F02C6/04; F02C6/10; F02C6/12; F16C2360/00; F16C2360/23; F16C2360/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
In a high speed rotating machine having a rotatable assembly supported by bearings and enclosed lubricating means therefor, a seal assembly comprising: a lubrication chamber through which the rotatable assembly extends, said lubrication chamber being defined by wall members enclosing the bearings and the lubricating means; inner seal means in operable association between the wall members and a surface of the rotatable assembly; a duct arrangement directed towards the rotatable assembly, being disposed outboard of the wall members and forming a static pressure chamber therewith; outer seal means in operable association with the duct arrangement and a surface of the rotatable assembly; entry being provided for pressurized fluid to pass into the duct; a bleed path from the duct to both sides thereof through the outer seal means; and centrifugal pump means communicating the interior of said lubrication chamber with said static pressure chamber.
Claim 2
Dependent Claim
144 words
In a high speed rotating machine having a rotatable assembly supported by bearings and enclosed lubricating means therefor, a seal assembly comprising: a lubrication chamber through which the rotatable assembly extends, said lubrication chamber being defined by wall members enclosing the bearings and the lubricating means; inner seal means in operable association between the wall members and a surface of the rotatable assembly; a duct arrangement directed towards the rotatable assembly, being disposed outboard of the wall members and forming a static pressure chamber therewith; outer seal means in operable association with the duct arrangement and a surface of the rotatable assembly; entry being provided for pressurized fluid to pass into the duct; a bleed path from the duct to both sides thereof through the outer seal means; and centrifugal pump means communicating the interior of said lubrication chamber with said static pressure chamber.
Claim 3
Dependent Claim
21 words
Apparatus as claimed in claim 1, wherein the duct arrangement comprises two spaced apart radial plates providing the duct between them.
Claim 4
Dependent Claim
16 words
Apparatus as claimed in claim 1 wherein said inner and outer seal means are labyrinth seals.
Claim 5
Dependent Claim
38 words
Apparatus as claimed in claim 1 wherein said machine is a turbo-compressor, and wherein said entry for pressurized fluid to pass into the duct is connected with a region of pressurized fluid in the turbine of the machine.
Claim 6
Dependent Claim
34 words
Apparatus as claimed in claim 4 wherein said bleed path, to one side of the duct, is arranged to bleed some of the fluid to the back of a compressor wheel of the machine.
Claim 7
Dependent Claim
32 words
Apparatus as claimed in claim 1 wherein said centrifugal pump is carried and driven by said rotatable assembly for tending to pump air from said lubrication chamber to said static pressure chamber.
Claim 8
Dependent Claim
117 words
In combination: a rotatable assembly, a housing disposed around said rotatable assembly and including bearing means to rotatably support said assembly, a lubrication chamber means disposed within said housing around said bearing means to provide lubrication to said bearing means, said lubrication chamber means including inner seal means disposed between said lubrication chamber means and said rotatable assembly, and static pressure chamber means disposed within said housing around said lubrication chamber means and including outer seal means disposed between said static pressure chamber means and said rotatable assembly, centrifugal pump means communicating the interior of said lubrication chamber with said static pressure chamber for tending to pump air from said lubrication chamber to said static pressure chamber.
Claim 9
Dependent Claim
117 words
In combination: a rotatable assembly, a housing disposed around said rotatable assembly and including bearing means to rotatably support said assembly, a lubrication chamber means disposed within said housing around said bearing means to provide lubrication to said bearing means, said lubrication chamber means including inner seal means disposed between said lubrication chamber means and said rotatable assembly, and static pressure chamber means disposed within said housing around said lubrication chamber means and including outer seal means disposed between said static pressure chamber means and said rotatable assembly, centrifugal pump means communicating the interior of said lubrication chamber with said static pressure chamber for tending to pump air from said lubrication chamber to said static pressure chamber.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |