Method and apparatus for variable clearance packing
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01D-011/12
F01D-025/24
출원번호
UP-0441286
(2006-05-25)
등록번호
US-7731478
(2010-06-29)
발명자
/ 주소
Chevrette, Richard
Baily, Frederick G.
출원인 / 주소
General Electric Company
대리인 / 주소
Armstrong Teasdale LLP
인용정보
피인용 횟수 :
4인용 특허 :
15
초록▼
Methods and apparatus for a packing ring segment assembly for sealing a turbine gas path are provided. The assembly includes a sealing portion including radially inwardly directed teeth, and a dovetail mounting portion including a hollowed out portion including a biasing member internal to the packi
Methods and apparatus for a packing ring segment assembly for sealing a turbine gas path are provided. The assembly includes a sealing portion including radially inwardly directed teeth, and a dovetail mounting portion including a hollowed out portion including a biasing member internal to the packing ring segment. The biasing member is coupled to the packing ring segment and configured to engage a pair of annular shoulders of a dovetail groove in the turbine such that the packing ring segment is biasing radially outward at relatively low turbine loads and low working pressure, and at relatively high turbine loads and high working pressure a working fluid overcomes the radial biasing member forces and urge the packing ring segment radially inward.
대표청구항▼
What is claimed is: 1. A packing ring segment assembly for sealing a gap between two regions of an article, said packing ring segment assembly comprising: a sealing portion including radially inwardly directed teeth; a dovetail mounting portion sized to slideably engage a pair of opposing shoulders
What is claimed is: 1. A packing ring segment assembly for sealing a gap between two regions of an article, said packing ring segment assembly comprising: a sealing portion including radially inwardly directed teeth; a dovetail mounting portion sized to slideably engage a pair of opposing shoulders that define a dovetail groove in the article, said dovetail mounting portion comprising a hollowed out portion that extends radially inward from an outer surface of said packing ring segment towards said sealing portion; a bracket positioned within said hollowed out portion, said bracket comprising a pair of legs extending generally radially outward from a base, each of said pair of legs comprising a bracket flange extending outward from said leg and contacting one of the shoulders when said dovetail mounting portion is coupled within said dovetail groove; and a biasing member positioned within said bracket, said biasing member coupled to said dovetail mounting portion and to said bracket, said biasing member is configured to urge said packing ring segment assembly radially outward at relatively low differential pressure between the two regions, and at a relatively high differential pressure between the two regions, the differential pressure overcomes the radial biasing member forces and urges said sealing portion radially inward, said dovetail portion movable in a first direction. 2. An assembly in accordance with claim 1 wherein said dovetail mounting portion comprises a groove substantially aligned with said sealing portion, said groove being in fluid communication with said hollowed out portion. 3. An assembly in accordance with claim 1, wherein said bracket comprises a U-shaped bracket comprising a base configured to be positioned in said hollowed out portion. 4. An assembly in accordance with claim 3 wherein said biasing member is coupled to said pair of annular shoulders of a dovetail groove through said U-shaped bracket such that a biasing force generated by said biasing member is transmitted to said pair of annular shoulders through said U-shaped bracket. 5. An assembly in accordance with claim 1 further comprising a biasing member retainer configured to retain said biasing member at least partially within said hollowed out portion. 6. An assembly in accordance with claim 1 further comprising a biasing member retainer coupled to said radially outer surface of said packing ring segment. 7. An assembly in accordance with claim 1 wherein said biasing member retainer substantially covers a radially outer opening of said hollowed out portion. 8. An assembly in accordance with claim 1 wherein said biasing member is a coil spring. 9. A turbine diaphragm for accommodating a rotor, said turbine diaphragm comprising: a diaphragm body having a radially inner bore and an inwardly recessed dovetail groove; a plurality of packing ring segments forming a seal ring between a first pressure region and a second pressure region wherein the first pressure is greater than the second pressure; wherein said dovetail groove includes a shoulder portion which defines a radial opening into said dovetail groove and wherein said shoulder portion includes an annular surface; and wherein each of said packing ring segments comprise a dovetail mounting portion at least partially enclosed in said dovetail groove and at least partially supported by said annular surface, said packing ring segments including a hollowed out portion that extends radially inward from an outer surface of at least one of said packing ring segments, said hollowed out portion including a bracket positioned within said hollowed out portion and a biasing member positioned within said bracket, said bracket comprising a pair of legs extending outward from a base, each of said pair of legs comprising a bracket flange extending outward from said leg and contacting said shoulder portion when said dovetail mounting portion is within said dovetail groove, said bracket and biasing member positioned between said packing ring segments and said annular surface such that said packing ring segments are biasing radially outward at relatively low turbine loads and low working pressure, and at relatively high turbine loads and high working pressure a working fluid will overcome the radial biasing member forces and urge said packing ring segments radially inward. 10. A turbine diaphragm in accordance with claim 9 wherein said packing ring segments are biasing radially outward to form a relatively larger diameter ring providing a large clearance position of said seal ring with respect to said rotor. 11. A turbine diaphragm in accordance with claim 9 wherein said packing ring segments are configured such that when the working fluid is at a relatively high pressure, the working fluid urges said packing ring segments into a relatively small clearance position with respect to said shaft. 12. A turbine diaphragm in accordance with claim 9 wherein said groove is in fluid communication with a high pressure region upstream from said seal ring. 13. A turbine comprising: a stationary turbine casing surrounding a rotatable shaft, said casing comprising 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; and a segmented seal ring comprising a plurality of packing ring segments supported by and at least partially enclosed in said groove, said packing ring segments including a hollowed out portion that extends radially inward from an outer surface of at least one of said packing ring segments, said hollowed out portion including a bracket positioned within said hollowed out portion and a biasing member positioned within said bracket, said bracket comprising a pair of legs extending outward from a base, each of said pair of legs comprising a bracket flange extending outward from said leg and contacting one of said shoulders, said bracket and biasing member positioned between said packing ring segments and said annular shoulders such that said packing ring segments are biasing radially outward at relatively low turbine loads and low working pressure, and at relatively high turbine loads and high working pressure a working fluid will overcome the radial biasing member forces and urge said packing ring segments radially inward. 14. A turbine in accordance with claim 13 wherein said packing ring segments are biasing radially outward to form a relatively larger diameter ring providing a large clearance position of said seal ring with respect to said shaft. 15. A turbine in accordance with claim 13 wherein said packing ring segments are configured such that when the working fluid is at a relatively high pressure, the working fluid urges said packing ring segments into a relatively small clearance position with respect to said shaft. 16. A turbine in accordance with claim 13 wherein said groove is in fluid communication with a high pressure region upstream from said seal ring. 17. A turbine in accordance with claim 13 wherein said seal ring comprises a dovetail mounting portion that comprises a groove substantially aligned with a sealing portion, said groove being in fluid communication with said hollowed out portion. 18. A turbine in accordance with claim 17 wherein said bracket comprises a U-shaped bracket comprising a base configured to be positioned in said hollowed out portion. 19. A turbine in accordance with claim 18 wherein said biasing member coupled to said pair of annular shoulders of a dovetail groove through said U-shaped bracket such that a biasing force generated by said biasing member is transmitted to said pair of annular shoulders through said U-shaped bracket. 20. A turbine in accordance with claim 13 further comprising a biasing member retainer configured to retain said biasing member at least partially within said hollowed out portion.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (15)
Sarshar, Hamid Reza; Turnquist, Norman Arnold; Fang, Biao, Actuating seal for a rotary machine and method of retrofitting.
Popa, Daniel Michael; Chevrette, Richard Jon; Wolfe, Christopher Edward; Kirby, III, George Horner, Apparatus and methods for supporting a retractable packing ring.
Dinc Osman Saim ; Turnquist Norman Arnold ; Cromer Robert Harold ; Reluzco George Ernest ; Wolfe Christopher Edward, Positive biased packing ring brush seal combination.
Chevrette, Richard Jon; Skinner, David Robert; Kirby, II, George Horner; Wolfe, Christopher Edward, Retractable packing ring lower half segment retaining key and method for retaining retractable packing ring lower half segment.
Brandon Ronald E. (Melbourne FL), Retractible segmented packing ring for fluid turbines having gravity springs to neutralize packing segment weight forces.
Fang, Biao; Turnquist, Norman Arnold; Sarshar, Hamid Reza; Aksit, Mahmut Faruk; Burnett, Mark Edward; Baily, Frederick George; Demiroglu, Mehmet, Seal carrier for a rotary machine and method of retrofitting.
Cromer Robert Harold ; Turnquist Norman Arnold ; Nielsen Stephen H. ; Chevrette Richard Jon, Uniform clearance, temperature responsive, variable packing ring.
Chevrette Richard Jon ; Skinner David Robert ; Knorowski Victor John, Variable clearance packing ring with clips for preventing circumferential displacement.
Skinner David Robert ; Knorowski Victor John ; O'Connor Martin Francis ; Chevrette Richard Jon ; Swart Thomas William, Variable clearance packing ring with guide for preventing circumferential displacement.
Holmes, James Bradford; Hollis, James Robert; Spracher, David Randolph; Sullivan, Wayne David, Turbomachine component displacement apparatus and method of use.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.