Patent US3608910A successfully refreshed from Google Patents.
US3608910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft seal arrangements
Assignee: Dowty Fuel Systems Ltd
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Filing: 1969-10-29
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Granted: 1971-09-28
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Expires: 1989-10-29
Abstract
Abstract A seal assembly for use with a rotatable shaft has a sealing ring axially loaded against a flange portion of the shaft, a number of orifices directing fluid for cooling and lubrication radially inwardly against the sealing ring, and a scavenge pump having an impeller which is formed by a part of the flange disposed radially outwardly of the sealing ring, and which operates during rotation of the shaft to return the fluid to the source and to maintain low fluid pressure adjacent the sealing ring. When applied to the shaft of a fuel pump, the foregoing arrangement is used to seal a lubricated part of the shaft which is supported in bearings, while a second seal engages the part of the shaft adjacent the pump, the space around the shaft between the two sealing rings being vented.
Inventors
- 👤 Stanley R Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:43
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/38; F04; F04D; F04D29/00; F04D29/06; F04D29/061; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F04D29/128; Y; Y10; Y10S; Y10S277/00; Y10S277/93
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
236 words
A seal assembly for use between a fixed member and a rotatable shaft member to retain a liquid, comprising means on the shaft member defining a sealing face lying in a plane transverse to the rotational axis of the shaft member, a sealing ring mounted in the fixed member to engage the sealing face and thereby to separate a zone, disposed radially outwardly of the sealing ring and which when the seal assembly is in use contains said liquid, from a zone disposed radially inwardly of the sealing ring and which is vented, a passage formed in the fixed member radially outwardly of the sealing ring and adapted for connection to a source of said liquid, a plurality of orifices opening from said passage into said liquid-containing zone, each of said orifices being arranged to provide a jet of liquid directed towards the sealing ring where said sealing ring engages the sealing face, an impeller provided on said shaft member adjacent the liquid-containing zone and cooperable with the fixed member to form a scavenge pump, and a discharge passage in the fixed member on the outlet side of the scavenge pump, said discharge passage being adapted to return liquid to the source, and the scavenge pump being operable upon rotation of the shaft to expel liquid received by the liquid-containing zone from the jet orifices and thereby to establish a low pressure in said first-mentioned zone.
Claim 2
Dependent Claim
236 words
A seal assembly for use between a fixed member and a rotatable shaft member to retain a liquid, comprising means on the shaft member defining a sealing face lying in a plane transverse to the rotational axis of the shaft member, a sealing ring mounted in the fixed member to engage the sealing face and thereby to separate a zone, disposed radially outwardly of the sealing ring and which when the seal assembly is in use contains said liquid, from a zone disposed radially inwardly of the sealing ring and which is vented, a passage formed in the fixed member radially outwardly of the sealing ring and adapted for connection to a source of said liquid, a plurality of orifices opening from said passage into said liquid-containing zone, each of said orifices being arranged to provide a jet of liquid directed towards the sealing ring where said sealing ring engages the sealing face, an impeller provided on said shaft member adjacent the liquid-containing zone and cooperable with the fixed member to form a scavenge pump, and a discharge passage in the fixed member on the outlet side of the scavenge pump, said discharge passage being adapted to return liquid to the source, and the scavenge pump being operable upon rotation of the shaft to expel liquid received by the liquid-containing zone from the jet orifices and thereby to establish a low pressure in said first-mentioned zone.
Claim 3
Dependent Claim
36 words
A seal assembly according to claim 1, wherein the sealing face is formed on a flanged portion of the shaft member, and the impeller is formed on the flanged portion radially outwardly of the sealing face.
Claim 4
Dependent Claim
271 words
In a pump for liquids having a shaft member rotatable in a housing, a shaft seal assembly comprising means on the shaft member defininG a first sealing face lying in a plane transverse to the rotational axis of the shaft, a first sealing ring mounted in the housing to engage the sealing face and thereby to separate a zone, disposed radially outwardly of the sealing ring and which when the pump is in use contains lubricant, from another zone disposed radially inwardly of the sealing ring and which is vented, a passage formed in the housing radially outwardly of the sealing ring and adapted for connection to a source of said lubricant, a number of orifices opening from said passage into said lubricant-containing zone, each of said orifices being arranged to provide a jet of lubricant directed towards the second sealing ring where the sealing ring engages the sealing face, an impeller provided on said shaft member adjacent the lubricant-containing zone and cooperable with the housing to form a scavenge pump, a discharge passage in the housing on the outlet side of the scavenge pump, said discharge passage being adapted for connection to the source of lubricant, and the scavenge pump being operable upon rotation of the shaft to expel liquid received into the lubricant-containing zone from the jet orifices and thereby to establish a low pressure in the lubricant-containing zone, and a second sealing ring mounted in the housing and engaging the shaft member to separate a further zone, which when the pump is in use contains the liquid to be pumped, from the said other zone which is vented.
Claim 5
Dependent Claim
271 words
In a pump for liquids having a shaft member rotatable in a housing, a shaft seal assembly comprising means on the shaft member defininG a first sealing face lying in a plane transverse to the rotational axis of the shaft, a first sealing ring mounted in the housing to engage the sealing face and thereby to separate a zone, disposed radially outwardly of the sealing ring and which when the pump is in use contains lubricant, from another zone disposed radially inwardly of the sealing ring and which is vented, a passage formed in the housing radially outwardly of the sealing ring and adapted for connection to a source of said lubricant, a number of orifices opening from said passage into said lubricant-containing zone, each of said orifices being arranged to provide a jet of lubricant directed towards the second sealing ring where the sealing ring engages the sealing face, an impeller provided on said shaft member adjacent the lubricant-containing zone and cooperable with the housing to form a scavenge pump, a discharge passage in the housing on the outlet side of the scavenge pump, said discharge passage being adapted for connection to the source of lubricant, and the scavenge pump being operable upon rotation of the shaft to expel liquid received into the lubricant-containing zone from the jet orifices and thereby to establish a low pressure in the lubricant-containing zone, and a second sealing ring mounted in the housing and engaging the shaft member to separate a further zone, which when the pump is in use contains the liquid to be pumped, from the said other zone which is vented.
Claim 6
Dependent Claim
97 words
A shaft seal assembly according to claim 3, including second means on said shaft member defining a second sealing face which lies in a plane transverse to the rotational axis of the shaft and which is engaged by the second sealing ring, a passage formed in the housing radially outwardly of the second sealing ring and adapted to be connected to the source of liquid to be pumped, said passage opening into the further liquid-containing zone, and a passage in the shaft member arranged to return liquid from said liquid-containing zone to the inlet of the pump.
References Cited (Backward Citations)
AT243031B
Cited
US3477729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |