[특허]Retractible segmented packing ring for fluid turbines having gravity springs to neutralize packing segment weight forces

Retractible segmented packing ring for fluid turbines having gravity springs to neutralize packing segment weight forces 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16J-015/44
출원번호	US-0000148 (1993-01-04)
발명자 / 주소	Brandon Ronald E. (Melbourne FL)
출원인 / 주소	IMO Industries, Inc. (Lawrenceville NJ 02)
인용정보	피인용 횟수 : 32 인용 특허 : 0

초록 ▼

A segmented seal ring and spring system for steam turbines for minimizing leakage between rotating and stationary components, and preventing damage and wear thereto, including a segmented seal ring, with first springs biased against the seal segments to urge the segments radially outward toward a large clearance position of the seal ring with respect to the turbine shaft. The springs urge the seal segments into the large clearance position at low shaft speeds and small turbine loads, whereas at medium to high flows and high working pressure, working fluid will overcome the spring forces and urge the seal segments into a small clearance position. Special gravity springs are provided in the lower half seal ring segments with the lower end of such springs seated against the turbine casing while the upper spring end is biased against the seal segment to produce an upward force which neutralizes the downward force caused by the weight of the segment. The gravity spring provides a spring force in the vertical direction which is equal to the weight of the segment which it supports so that the fluid pressure forces required to close the lower seal segments is the same as the radially outward biasing spring force and the friction forces. The gravity springs, by reducing or eliminating the weight forces of the lower seal segments, avoids the friction and interference which might otherwise interfere with the radial inward movement of the segments to the small clearance position.

대표청구항 ▼

An elastic fluid turbine employing a segmented seal ring to minimize leakage between rotating and stationary components, while also providing a large clearance between said components during start up and at light loads to protect said seal ring from damage, comprising: a stationary turbine casing encircling a rotating shaft and having an annular T-shaped groove formed therein and extending circumferentially around said shaft, said annular groove being partially defined by a pair of opposing, spaced apart annular shoulders on said casing which form an annular opening of said groove radially into the clearance area between said casing and said shaft; a segmented seal ring supported by and at least partially contained in said groove, said seal ring including both upper seal segments located around the upper half of said shaft, and lower seal segments located around the lower half of said shaft, each seal segment having seal teeth; radial springs positioned against said seal segments to urge said seal segments radially outward to form a larger diameter ring providing a large clearance position of said seal ring with said shaft, said radial springs providing radially outward forces whereby at low speed and small turbine loads the radial spring forces will predominate and said seal segments will be forced to said large clearance position, whereas at high flows and high working pressure, working fluid will overcome the radial spring forces and urge said seal segments into a small clearance position; and gravity spring means including at least one gravity spring positioned generally vertically between a lower half of said turbine casing and at least one lower seal segment, each said gravity spring producing an upward vertical force against said lower seal segment which is substantially equal to and thereby counteracts the downward weight force of said lower seal segment; whereby each said gravity spring, by only neutralizing said weight forces of said lower seal segments, does not interfere with the action of said radial springs to urge said seal segments out to said large clearance position at low speed and small turbine loads, and each said gravity spring prevents friction and interference between adjacent said seal segments as they move radially inward to said small clearance position under the influence of the working fluid at high flows and high working pressure.

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Baran, Robert Gerard; Palmer, Gene David; Lavash, John Cleland; Lathrop, Norman Douglas, Methods and systems for calculating steam turbine radial clearance.
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Brandon Ronald Earl ; Brandon David Earl, Retractable segmented packing ring for fluid turbines having gravity springs to neutralize packing segment weight forces.
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Brandon Ronald Earl ; Brandon David Earl, Retractable segmented packing rings for fluid turbines.
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Fuller, Bruce E., Segmented labyrinth seal assembly and method.
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Fedorovich George, Split labyrinth seal.
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Cromer Robert Harold ; Turnquist Norman Arnold ; Nielsen Stephen H. ; Chevrette Richard Jon, Uniform clearance, temperature responsive, variable packing ring.
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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

Retractible segmented packing ring for fluid turbines having gravity springs to neutralize packing segment weight forces 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

이 특허를 인용한 특허 (32)

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연합인증

Retractible segmented packing ring for fluid turbines having gravity springs to neutralize packing segment weight forces 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (32)

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