Stationary seal ring assembly for use in dry gas face seal assemblies
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16J-015/38
F16J-015/34
출원번호
US-0495436
(1990-03-16)
발명자
/ 주소
Holder Mark C. (Mohnton PA)
출원인 / 주소
Stein Seal Company (Kulpsville PA 02)
인용정보
피인용 횟수 :
19인용 특허 :
0
초록▼
A stationary seal ring assembly for a dry gas face seal unit which comprises a face seal ring adapted to cooperate with a rotating mating ring mounted on a shaft, a shroud mounted on the periphery of the face seal ring to prevent the ring from bending or deflecting when subjected to unbalanced gas p
A stationary seal ring assembly for a dry gas face seal unit which comprises a face seal ring adapted to cooperate with a rotating mating ring mounted on a shaft, a shroud mounted on the periphery of the face seal ring to prevent the ring from bending or deflecting when subjected to unbalanced gas pressures, and mounting apparatus connected between the face seal and the shroud for mounting the shroud onto the face seal ring, the mounting apparatus comprising a support ring and a retaining ring which, together with the shroud, urge a pair of seals against the opposite faces of the stationary seal ring. The face seal ring also includes a pair of static annular grooves formed in the mating face of the seal ring, with a plurality of recesses extending between the annular grooves, whereby the high-pressure gas is deflected against the radial and axial faces of the annular grooves to evenly distribute high-pressure gas on the mating surface of the seal ring to tend to prevent deflection and bending of the stationary seal ring.
대표청구항▼
A stationary seal ring assembly (21) for a dry gas face seal unit (11) for sealing a rotating shaft (13) in a casing or housing (15) in a gas turbine, or compressor, to seal the highpressure side (17) of the unit (11) from the lowpressure side (19), comprising a stationary face seal ring (28) mounte
A stationary seal ring assembly (21) for a dry gas face seal unit (11) for sealing a rotating shaft (13) in a casing or housing (15) in a gas turbine, or compressor, to seal the highpressure side (17) of the unit (11) from the lowpressure side (19), comprising a stationary face seal ring (28) mounted on a seal housing (23), and having a bore (37), a rotatable mating ring (25) mounted on a shaft (13) and rotatable therewith, said shaft (13) having an axis of rotation, a sealing face (27) on said stationary face seal ring (28) adapted to cooperate with a sealing face (29) on mating ring (25) to effect a desired seal therebetween, a shroud (43) mounted on the radial outer circumference of the stationary face seal ring (28) for holding said stationary face seal ring (28) against deflection, means (47,49,55,57), for sealingly mounting the shroud (43) on the radial outer periphery of said stationary face seal ring (28), radial bleed holes (91) in the stationary face seal ring (28) for exhausting to the atmosphere (19) any gas from the high-pressure side (17) of said seal unit (11) that penetrates the gas seal between the shroud (43) and the stationary face seal ring (28), a secondary seal ring (31) seated in the housing (23) and extending radially to contact the bore (37) of the stationary face seal ring (28) to seal the bore (37) of the stationary face seal ring (28) against the escape of high-pressure gas, said secondary seal ring (31) being a gapped ring made of carbon, the secondary seal ring (31) being seated in a groove (33) in the seal housing (23) with a radially extending planar sealing surface (39) abutting radially an extending surface (41) of the groove (33), and said surfaces (39), (41) having a radial space relationship with a radially extending surface (87) on said stationary face seal ring (28) so as to balance pressure forces, an outer-radial annular groove (93) formed in the sealing face (27) of the stationary face seal ring (28) and having a radial outer axial rim (95) and a radial inner axial rim (97), an inner-radial annular groove (99) formed in the sealing face (27) of said stationary face seal ring (28) and having a radial outer axial rim (101) and a radial inner axial rim (103), a plurality of radial slots (105) extending between the radial outer (93) and radial inner (99) annular grooves to channel the high-pressure gas between the radial outer annular groove (93) and the radial inner annular groove (99) so that the gas exerts balancing pressures against the radial outer axial rim (95) of the radial outer annular groove (93) and against the radial inner axial rim (103) of the radial inner annular groove (99), a bearing pad (113) formed in the sealing face (27) between the radial outer (93) and radial inner (99) annular grooves, an annular seal dam (115) formed in the radial inner portion of the seal face (29) of the stationary ring (28) radially inward of the inner annular groove (99), the radial inner axial rim (97) of the radial outer annular groove (93) being positioned radially inward of a rim (107) of the rotating ring (25) so as to avoid wearing a step in the face (29) of said stationary face seal ring (28).
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이 특허를 인용한 특허 (19)
Ullah, M. Rifat, Distortion resistant face seal counterface system.
Zheng, Xiaoqing; Coffey, Daniel Robert; Lu, Guoqiang; Powers, John Richard; Scarlata, Steven Paul; Suttles, Christopher David, Shaft sealing system for steam turbines.
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