[특허]Seal for sealing an incompressible fluid between a relatively stationary seal and a movable member

Seal for sealing an incompressible fluid between a relatively stationary seal and a movable member 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16J-015/34
출원번호	US-0371283 (1995-01-11)
발명자 / 주소	McNickle Alan D. (Sellersville PA) Hwang Mingfong (Lansdale PA) Pope Adam N. (Cincinnati OH)
출원인 / 주소	Stein Seal Company (Kulpsville PA 02)
인용정보	피인용 횟수 : 63 인용 특허 : 0

초록 ▼

A seal structure is provided having a configuration with a very small seal gap between a relatively stationary seal member and a complementary surface on a movable (rotatable) member (such as a rotating shaft) adjacent to which the stationary seal member is mounted. The stationary seal member is movable toward and away from the movable seal member so as to vary the seal gap therebetween. The seal is effective in applications where an incompressible fluid is provided on the high pressure side of the stationary seal member so that leakage along the seal gap is of an incompressible fluid into a lower pressure region on the other side of the seal gap. A sealing dam is provided on the stationary seal member on its sealing face adjacent the low pressure end of the seal gap. A plurality of elongated pads are formed on the sealing surface of the stationary seal member on the high pressure side of the sealing dam, extending perpendicularly to the direction of leakage flow along the seal gap. Lift pockets are formed in predetermined pads and positioned such that fluid is forced into the pocket by the velocity shearing gradient between the movable and stationary members to generate an increased pressure in the pockets to move the stationary seal member away from the movable member to increase the seal gap between the two. The lift pocket is of a depth sufficient, in the event of wear of the lift pocket surface, to result in a pressure increase in the lift pocket as a consequence of its reduction in depth to move the seal member away from the movable member, thereby causing the seal gap to become self-regulating in

대표청구항 ▼

A stationary seal member adapted to control and minimize the leakage of an incompressible fluid along a path between a sealing surface on said seal member and a complementary surface on a movable member adjacent to which said seal member is adapted to be mounted, said sealing surface terminating at two spaced edges, one of said edges adapted to be exposed to an incompressible fluid in a first region at relatively higher ambient pressure, the second of said edges being essentially continuous and being adapted to be exposed to a second region at a relatively lower ambient pressure, said sealing member being formed when in its operating position to isolate said first and second regions except along the aforementioned path, whereby the incompressible fluid is adapted to pass between said sealing surface and the complementary movable surface from said one edge toward said second edge, said stationary seal member being adapted to be resiliently mounted such that said sealing surface is movable under resilient force toward said complementary surface and into engagement therewith and against such resilient force away from said complementary surface to vary the gap between said sealing and said complementary surfaces, said stationary seal member having: i. a sealing dam formed on such sealing surface adjacent said second edge and an elongated groove in said sealing surface positioned adjacent to and parallel with said sealing dam; ii. said seal member having a plurality of spaced transverse grooves formed in said sealing surface and extending from said first edge thereof transversely across said sealing surface and terminating in said elongated groove forming a plurality of relatively short pads on said sealing surface between said groove, said first edge and the adjacent transverse grooves respectively; iii. at least some of said pads each having a pocket formed therein and extending from one of said transverse grooves into the respective pad and terminating in said pad short of the adjacent transverse groove, each of said pockets being exposed to said complementary surface and being formed such that, when said movable surface moves relative to said sealing surface, incompressible fluid is moved into said pockets by the velocity shearing gradient between said movable and stationary members to generate an increased pressure in said pockets to urge said seal member away from said movable surface, said pocket being a depth sufficient in size such that upon moderate wear of the pad due to rubbing against said complementary surface, said pocket depth continues to be of sufficient size to maintain a velocity gradient induced pressure increase therein, said seal member being formed such that in the event of wear of said seal member pads to reduce the depth of said pocket, the velocity gradient in said pocket is increased to increase the pressure in said pocket, whereby said gap is increased and thus causing said gap to be self-regulating in size; and iv. said seal member having a bleed opening provided in the interior of said pocket passing through a portion of said seal member and communicating with a surface on said seal member that during operation is exposed to the level of pressure in said first region.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Seal for sealing an incompressible fluid between a relatively stationary seal and a movable member 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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Seal for sealing an incompressible fluid between a relatively stationary seal and a movable member 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (63)

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