[특허]Rotary face seal with anti-crowning features

Air Products and Chemicals, Inc.

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Rotary face seal with anti-crowning features

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16K-051/00
미국특허분류(USC)	137/246.22; 251/333
출원번호	US-0496347 (2009-07-01)
등록번호	US-8616233 (2013-12-31)
발명자 / 주소	McLean, Christopher R. LeBlanc, Michel P. McKerrow, Michael J. Keefer, Bowie G. Lu Kong, Xiang Lebeck, Alan O.
출원인 / 주소	Air Products and Chemicals, Inc.
대리인 / 주소	Schaal, Eric J.
인용정보	피인용 횟수 : 14 인용 특허 : 13

초록
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A typical rotary face seal employs a seal ring rotating relative to a sealing surface and also employs means to urge the seal ring towards the sealing surface in order to effect a seal. The seal ring may itself comprise a seal face bonded to a backing ring. In certain applications, the seal face may deform significantly as a result of the temperature variations experienced and an undesirable crowning of the seal face may occur. Such crowning may be reduced by employing an improved seal ring with anti-crowning features in which the thickness of an edge of the seal face is different from that in the middle of the seal face, or in which a relief slot is employed in the seal face. The improved seal ring is particularly suited for rotary face seals used in a rotary valve in a rotary gas separation device.

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1. A rotary face seal, comprising a seal ring, comprising a seal face bonded to a backing ring, a side of the seal face opposite the backing ring being essentially flat, the seal ring having as an anti-crowning feature a thickness of an edge of the seal face that is different from that of a middle portion of the seal face, wherein the seal face contacts a sealing surface. 2. The rotary face seal of claim 1 further comprising at least one port through both the seal face and the backing ring. 3. The rotary face seal of claim 1 wherein the seal face has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the backing ring, and wherein a thickness of an edge of the seal face is greater than that of a middle portion of the seal face. 4. The rotary face seal of claim 3 wherein the backing ring is correspondingly thinner adjacent a thicker edge of the seal face such that the side of the seal face opposite the backing ring contacts a sealing surface and is essentially flat. 5. The rotary face seal of claim 3 wherein an inner circumference of the seal face has a thicker edge than that of a middle portion of the seal face. 6. The rotary face seal of claim 3 wherein an outer circumference of the seal face has a thicker edge than that of a middle portion of the seal face. 7. The rotary face seal of claim 3 wherein both an inner circumference and an outer circumference of the seal face have thicker edges than that of a middle portion of the seal face. 8. The rotary face seal of claim 2 wherein the seal face has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the backing ring, and wherein a thickness of an edge of the seal face is greater than that of a middle portion of the seal face. 9. The rotary face seal of claim 8 wherein the backing ring is correspondingly thinner adjacent a thicker edge of the seal face such that the seal face opposite the backing ring contacts the sealing surface and is essentially flat. 10. The rotary face seal of claim 8 wherein an inner circumference of the seal face has a thicker edge than that of a middle portion of the seal face. 11. The rotary face seal of claim 8 wherein an outer circumference of the seal face has a thicker edge than that of a middle portion of the seal face. 12. The rotary face seal of claim 8 wherein both an inner circumference and an outer circumference of the seal face have thicker edges than that of a middle portion of the seal face. 13. The rotary face seal of claim 2 wherein the seal face has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the backing ring, the seal face has a first edge located at a periphery of the port in the seal face, the seal face has a second edge located at an outer circumference of the seal face, and the first edge and the second edge are thicker than a middle portion of the seal face located between the first edge and the second edge. 14. The rotary face seal of claim 1 wherein the seal face has a coefficient of thermal expansion that is less than a coefficient of thermal expansion of the backing ring, and wherein a thickness of an edge of the seal face is less than that of a middle portion of the seal face. 15. The rotary face seal of claim 14 wherein the backing ring is correspondingly thicker adjacent a thinner edge of the seal face such that the side of the seal face opposite the backing ring contacts the sealing surface and is essentially flat. 16. The rotary face seal of claim 14 wherein an inner circumference of the seal face has a thinner edge than that of a middle portion of the seal face. 17. The rotary face seal of claim 14 wherein an outer circumference of the seal face has a thinner edge than that of a middle portion of the seal face. 18. The rotary face seal of claim 14 wherein both an inner circumference and an outer circumference of the seal face have thinner edges than that of a middle portion of the seal face. 19. The rotary face seal of claim 2 wherein the seal face has a coefficient of thermal expansion that is less than a coefficient of thermal expansion of the backing ring, and wherein a thickness of an edge of the seal face is less than that of a middle portion of the seal face. 20. The rotary face seal of claim 19 wherein the backing ring is correspondingly thicker adjacent a thinner edge of the seal face such that the seal face opposite the backing ring contacts a sealing surface and is essentially flat. 21. The rotary face seal of claim 19 wherein an inner circumference of the seal face has a thinner edge than that of a middle portion of the seal face. 22. The rotary face seal of claim 19 wherein an outer circumference of the seal face has a thinner edge than that of a middle portion of the seal face. 23. The rotary face seal of claim 19 wherein both an inner circumference and an outer circumference of the seal face have thinner edges than that of a middle portion of the seal face. 24. The rotary face seal of claim 2 wherein the seal face has a coefficient of thermal expansion that is less than a coefficient of thermal expansion of the backing ring, the seal face has a first edge located at a periphery of the port in the seal face, the seal face has a second edge located at an outer circumference of the seal face, and the first edge and the second edge are thinner than a middle portion of the seal face located between the first edge and the second edge. 25. The rotary face seal of claim 1 wherein the backing ring is made from a metal, a metal alloy, or combinations thereof. 26. The rotary face seal of claim 25 wherein the backing ring is made from steel. 27. The rotary face seal of claim 1 wherein the seal face is made from a polyalkylene polymer. 28. The rotary face seal of claim 1 wherein the seal face comprises a carbon-filled polytetrafluoroethylene. 29. The rotary face seal of claim 1 wherein the seal face has a blind relief slot in a middle portion thereof, the blind relief slot extending from the side of the seal face opposite the backing ring and partially through the seal face. 30. The rotary face seal of claim 1 wherein the seal face comprises a plurality of blind relief slots, each of the plurality of blind relief slots extending from the side of the seal face opposite the backing ring and partially through the seal face. 31. The rotary face seal of claim 30 where the plurality of blind relief slots are substantially equally spaced from one another. 32. The rotary face seal of claim 30 where the plurality of blind relief slots are unequally spaced from one another. 33. A rotary face seal, comprising a seal ring having a seal face bonded to a backing ring, a seal ring backer and a sealing surface, the seal ring having as an anti-crowning feature a thickness of an edge of the seal face that is different from that of a middle portion of the seal face, wherein the seal face contacts the sealing surface. 34. The rotary face seal according to claim 33 where the seal ring rotates relative to the sealing surface about a seal ring axis and a sealing load urges the seal ring towards the sealing surface causing a plurality of projections on the backing ring to mate with a plurality of chambers in the seal ring backer, and wherein a side of the seal face opposite the backing ring contacts the sealing surface and is essentially flat. 35. The rotary face seal of claim 33 further comprising at least one port through both the seal face and the backing ring. 36. The rotary face seal of claim 33 wherein the seal face has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the backing ring, and wherein a thickness of an edge of the seal face is greater than a thickness of a middle portion of the seal face. 37. The rotary face seal of claim 35 wherein the seal face has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the backing ring and a thickness of an edge of the seal face is greater than that of a middle portion of the seal face. 38. The rotary face seal of claim 37 wherein the backing ring is correspondingly thinner adjacent a thicker edge of the seal face such that a side of the seal face opposite the backing ring contacts the sealing surface and is essentially flat. 39. The rotary face seal of claim 35 wherein the seal face has a coefficient of thermal expansion that is greater than a coefficient of thermal expansion of the backing ring, the seal face has a first edge located a periphery of the port in the seal face, the seal face has a second edge located at an outer circumference of the seal face, and the first edge and the second edge are thicker than a middle portion of the seal face located between the first edge and the second edge. 40. The rotary face seal of claim 33 wherein the seal face has a coefficient of thermal expansion that is less than a coefficient of thermal expansion of the backing ring and a thickness of an edge of the seal face is less than a thickness of a middle portion of the seal face. 41. The rotary face seal of claim 35 wherein the seal face has a coefficient of thermal expansion that is less than a coefficient of thermal expansion of the backing ring and a thickness of an edge of the seal face is less than a thickness of a middle portion of the seal face. 42. The rotary face seal where of claim 33 where the seal face comprises a blind relief slot in a middle portion thereof, the blind relief slot extending from a side of the seal face opposite the backing ring and partially through the seal face. 43. The rotary face seal of claim 33 where the seal face comprises a plurality of blind relief slots, each of the plurality of blind relief slots extending from a side of the seal face opposite the backing ring and partially through the seal face. 44. The rotary face seal of claim 43 where the plurality of blind relief slots are substantially equally spaced from one another. 45. A rotary face seal, comprising a seal ring, comprising a seal face bonded to a backing ring, a side of the seal face opposite the backing ring being essentially flat, the seal ring having as an anti-crowning feature a blind relief slot extending from the side of the seal face opposite the backing ring and partially through the seal face, wherein the seal face contacts a sealing surface. 46. The rotary face seal of claim 45, wherein the blind relief slot is located in a middle portion of the seal face. 47. The rotary face seal of claim 45, further comprising a plurality of blind relief slots extending from the side of the seal face opposite the backing ring and partially through the seal face, wherein the plurality of blind relief slots are substantially equally spaced from one another. 48. The rotary face seal of claim 45, further comprising a plurality of blind relief slots extending from the side of the seal face opposite the backing ring and partially through the seal face, wherein the plurality of blind relief slots are unequally spaced from one another. 49. The rotary face seal of claim 45, wherein the seal face has a coefficient of thermal expansion that is different than a coefficient of thermal expansion of the backing ring. 50. The rotary face seal of claim 45, further comprising at least one flow port extending through both the seal face and the backing ring.

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이 특허를 인용한 특허 피인용횟수: 14

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Rotary face seal with anti-crowning features

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Rotary face seal with anti-crowning features

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