US3759532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid seal
Assignee: Ingersoll Rand Co
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Filing: 1972-06-09
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Granted: 1973-09-18
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Expires: 1992-06-09
Abstract
Abstract An improved fluid seal is disclosed which may be used equally effectively for either a straight leakoff seal or an injection seal. A differential pressure is maintained in the space between a first sealing member such as a collar on a rotatable shaft and an axially movable second seal member. A plurality of passageways which are equally spaced radially from the axis of the second seal member and equally spaced circumferentially interconnect the space between the two seal members and an external fluid pressure. The new seal may be used for sealing gas or liquid.
Inventors
- 👤 H Lindeboom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:56
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3404; F16J15/3408; F16J15/3412; F16J15/342
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
277 words
In combination with a housing containing fluid pressure and having a fluid outlet; a first seal member and a second seal member located along a fluid path between said fluid pressure and said outlet: the second seal member having a mating face opposite the first seal member and a rear face facing away from said mating face, said second seal member being adapted to be moved axially toward and away from the first seal member: the mating face of said second seal member having a pair of spaced dams extending across said fluid path and separated by a recessed portion extending between said dams, means for applying fluid pressure against at least a portion of the rear face of the second seal member; the shape and dimensions of the second seal member being such that there is a restricted fluid passageway between said mating face and said first seal member such that a differential pressure exists in the space between said seal members and the differential pressure acts in conjunction with the fluid pressure acting on said rear face to automatically balance and maintain the second seal member in a substantially sealing condition with the first seal member such that a slight spacing is maintained between said members; and means for providing seal passageways extending from the rear face of the second sael member and into said recessed portion at a point adjacent the dam being subjected to the higher pressure such that the pressure is substantially equal on opposite sides of the unrestricted passageways, the diameter of each unrestricted passageway being at least fifty times the depth of said recessed portion of the second seal member.
Claim 2
Dependent Claim
277 words
In combination with a housing containing fluid pressure and having a fluid outlet; a first seal member and a second seal member located along a fluid path between said fluid pressure and said outlet: the second seal member having a mating face opposite the first seal member and a rear face facing away from said mating face, said second seal member being adapted to be moved axially toward and away from the first seal member: the mating face of said second seal member having a pair of spaced dams extending across said fluid path and separated by a recessed portion extending between said dams, means for applying fluid pressure against at least a portion of the rear face of the second seal member; the shape and dimensions of the second seal member being such that there is a restricted fluid passageway between said mating face and said first seal member such that a differential pressure exists in the space between said seal members and the differential pressure acts in conjunction with the fluid pressure acting on said rear face to automatically balance and maintain the second seal member in a substantially sealing condition with the first seal member such that a slight spacing is maintained between said members; and means for providing seal passageways extending from the rear face of the second sael member and into said recessed portion at a point adjacent the dam being subjected to the higher pressure such that the pressure is substantially equal on opposite sides of the unrestricted passageways, the diameter of each unrestricted passageway being at least fifty times the depth of said recessed portion of the second seal member.
Claim 3
Dependent Claim
37 words
The combination of claim 1 wherein: the fluid applied against the rear face of the second seal member is from the same fluid source as the fluid flowing between said mating face and said first seal member.
Claim 4
Dependent Claim
67 words
The combination of claim 1 wherein: the means for applying fluid pressure against at least a portion of the rear face of the second seal member comprises: a fluid inlet adapted to permit the application of fluid pressure against said rear face and secondary sealing means separating said fluid from the fluid flowing between the mating face and the first seal member except through the unrestricted passageways.
Claim 5
Dependent Claim
33 words
The combination of claim 1 wherein: the first movable seal member is a collar connected to a rotatable shaft, and the second seal member is a sealing ring coaxial with the rotatable shaft.
Claim 6
Dependent Claim
42 words
The combination of claim 4 wherein: said dams are annualar protrusions adjacent the inner and outer edges of the sealing ring and the unrestricted fluid passageways are radially equally spaced from the axis of the sealing ring and equally spced apart circumferentially.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |