IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0568483
(2005-04-26)
|
등록번호 |
US-7758051
(2010-08-09)
|
우선권정보 |
GB-0409665.7(2004-04-30) |
국제출원번호 |
PCT/GB2005/001582
(2005-04-26)
|
§371/§102 date |
20061030
(20061030)
|
국제공개번호 |
WO05/106295
(2005-11-10)
|
발명자
/ 주소 |
- Roberts-Haritonov, Lev Uryevitch
- Reed, Julian Oliver
|
출원인 / 주소 |
|
대리인 / 주소 |
Chernoff, Vilhauer, McClung & Stenzel
|
인용정보 |
피인용 횟수 :
14 인용 특허 :
13 |
초록
▼
A gas seal assembly includes a pair of mutually rotatable sealing members, each of which has a front face adjacent a gap between the two members which constitutes a leakage path through the seal assembly. The two sealing member are urged, in use, in a direction to close the gap and a gas bleed arran
A gas seal assembly includes a pair of mutually rotatable sealing members, each of which has a front face adjacent a gap between the two members which constitutes a leakage path through the seal assembly. The two sealing member are urged, in use, in a direction to close the gap and a gas bleed arrangement is provided for allowing gas from a high pressure side of the seal to bleed into the gap so as to apply a force tending to separate the members. The gas bleed arrangement includes a bore extending between the front face and a rear face of one of the sealing members, a generally radial groove formed in the rear face of the sealing member and a plate overlying the rear face to cover the groove and thereby define between the rear face of the sealing member and the plate a bleed passage connecting the bore to the high pressure side of the seal. The plate is formed as a shim that is sufficiently flexible to be deflected by the gas pressure into mating contact with the rear face of the sealing member so as to confine the gas flow of the bleed passage to the radial groove.
대표청구항
▼
The invention claimed is: 1. A gas seal assembly comprising: a pair of mutually rotatable sealing members each of which has a front face adjacent a gap between the two members which constitutes a leakage path through the seal assembly, the members being urged, in use, in a direction to close the ga
The invention claimed is: 1. A gas seal assembly comprising: a pair of mutually rotatable sealing members each of which has a front face adjacent a gap between the two members which constitutes a leakage path through the seal assembly, the members being urged, in use, in a direction to close the gap, and a gas bleed arrangement for allowing gas from a high pressure side of the seal to bleed into the gap so as to apply a force tending to separate the members, the gas bleed arrangement comprising: a bore extending between the front face and a rear face of one of the sealing members, a generally radial groove formed in the rear face of the sealing member, a plate overlying the rear face to cover the groove and thereby define between the rear face of the sealing member and the plate a bleed passage connecting the bore to a high pressure side of the seal, and spring means to urge the plate into sealing contact with the rear face of said one of the sealing members, wherein the plate is formed as a shim that is sufficiently flexible to be deflected by the gas pressure into mating contact with the rear face of the sealing member so as to confine the gas flow of the bleed passage to the radial groove, and the spring means being sufficient to maintain the plate in sealing contact with the rear face of the sealing member at low pressure, the sealing member formed with a grooved rear face is associated with a rotatable shaft and the second sealing member is associated with a stationary casing, and said second sealing member is spring loaded to urge it in a direction tending to close the gap. 2. The gas seal assembly of claim 1, wherein the groove in the rear face of the sealing member is formed by etching. 3. The gas seal assembly of claim 1, further comprising a seal ring for sealing between said second member and the casing. 4. The gas seal assembly of claim 1, wherein the bore cooperates with formations in said front face to distribute the bleed gas over said front face. 5. The gas seal assembly of claim 4, wherein said formations comprise at least one generally arcuate groove in said front face. 6. The gas seal assembly of claim 4, wherein the formations in said front face include generally radial grooves serving to generate additional hydrodynamic lift. 7. A gas seal assembly comprising: a first sealing member associated with a rotatable shaft, the first sealing member having a front face and a rear face and being formed with a bore extending between the front face and the rear face and with a generally radial groove in the rear face, a second rotatable sealing member associated with a stationary casing, the second sealing member having a front face that confronts the front face of the first sealing member across a gap which constitutes a leakage path through the seal assembly, a first spring element urging the second sealing member in a direction tending to close the gap, a plate overlying the rear face of the first sealing member to cover the groove and thereby define between the rear face of the first sealing member and the plate a bleed passage connecting the bore to a high pressure side of the seal, the plate being formed as a shim that is sufficiently flexible to be deflected by the gas pressure into mating contact with the rear face of the first sealing member so as to confine the gas flow of the bleed passage to the radial groove, and a second spring element urging the plate into sealing contact with the rear face of the first sealing member, the second spring element being sufficient to maintain the plate in sealing contact with the rear face of the sealing member at low pressure, whereby gas from a high pressure side of the seal is able to bleed into the gap so as to apply a force tending to separate the first and second sealing members. 8. The gas seal assembly of claim 7, wherein the groove in the rear face of the first sealing member is formed by etching. 9. The gas seal assembly of claim 7, wherein the bore cooperates with formations in said front face to distribute the bleed gas over said front face. 10. The gas seal assembly of claim 9, wherein said formations comprise at least one generally arcuate groove in said front face. 11. The gas seal assembly of claim 9, wherein the formations in said front face include generally radial grooves serving to generate additional hydrodynamic lift.
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