Split mechanical face seal with seal face fluid introducing structure

• US 6,059,293 A
• Filed: 12/17/1997
• Issued: 05/09/2000
• Est. Priority Date: 12/17/1997
• Status: Expired due to Term

• Current Assignee: A W Chesterton Company
• Original Assignee: A W Chesterton Company
• Inventors: Azibert, Henri V., Clark, Marlen S., Ruan, Bo, Wu, Shifeng
• Primary Examiner(s): Knight, Anthony
• Assistant Examiner(s): Pickard, Alison K.
• Application Number:
  US08/992,611
• Time in Patent Office: 874 Days
• Field of Search: 277/401, 277/408, 277/399, 277/387, 277/388, 277/370, 277/358, 277/364
• US Class Current: 277/358
• CPC Class Codes: F16J 15/3488 Split-rings

Abstract

A split face seal that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal face. The seal ring faces of the seal rings are opposed to one another. One of the seal rings is connected to the rotating shaft to rotate therewith, while the other seal ring is connected to the housing. The split seal also includes a mechanism for introducing a fluid to the seal faces of the first and second seal rings and a split support member having at least two support segments for radially supporting the first seal ring to inhibit radial separation of the seal ring segments of the first seal ring.

Claims

1. A split non-contacting mechanical face seal for providing fluid sealing between a housing and a rotating shaft, said seal comprising

a first seal ring having at least two split seal ring segments and a radially extending first seal face,

a second seal ring having at least two split seal ring segments and a radially extending second seal face, said first and second seal faces being opposed to one another,

one of said first seal ring and said second seal ring being connected to said rotating shaft to rotate therewith, the other of said first seal ring and said second seal ring being connected to said housing, and

means for introducing a fluid to said first seal face and said second seal face and for producing a generally primarily hydrostatic force to maintain axial separation of at least a portion of said first seal face from at least a portion of said second seal face during operation, wherein said means for introducing includes a fluid conduit formed in one of said first and second seal rings.

2. The split mechanical seal according to claim 1, further comprising a split gland assembly having at least two gland segments coupled to an outer surface of said first seal ring for connecting said first seal ring to said housing.

3. The split mechanical seal according to claim 2, further comprising at least one split resilient member interposed between said split gland assembly and said outer surface of said first seal ring for resiliently engaging said first seal ring to form a seal therebetween.

4. The split mechanical seal according to claim 1, further comprising a split holder assembly having at least two holder segments coupled to an outer surface of said second seal ring for coupling said second seal ring to said rotating shaft.

5. The split mechanical seal according to claim 4, further comprising at least one split resilient member interposed between said split holder assembly and said outer surface of said second seal ring for resiliently engaging said second seal ring to form a seal therebetween.

6. The split mechanical seal according to claim 5, wherein said split resilient member is positioned to permit pivoting of said second seal ring about said split resilient member to maintain alignment of said first seal face and said second seal face.

7. The split mechanical seal according to claim 1, further comprising

a split gland assembly having at least two gland segments coupled to an outer surface of said first seal ring for connecting said first seal ring to said housing,

a first split resilient member interposed between said split gland assembly and said outer surface of said first seal ring for resiliently engaging said first seal ring to form a seal therebetween,

a split holder assembly having at least two holder segments coupled to an outer surface of said second seal ring for coupling said second seal ring to said rotating shaft, and

a second split resilient member interposed between said split holder assembly and said outer surface of said second seal ring for resiliently engaging said second seal ring to form a seal therebetween.

8. The split mechanical seal according to claim 1, further comprising means for introducing a closing fluid to a rear surface of said first seal ring to provide a closing force on said first seal ring, said closing force biasing said first seal face relative to the other seal face.

9. The split mechanical seal according to claim 1, further comprising means for fluidly retaining said seal ring segments of said first seal ring in a sealing relationship in a negative pressure condition.

10. The split mechanical seal according to claim 1, wherein said fluid introduced to said first and second seal faces establishes a gap having a selected width between said first and second seal faces, said split mechanical seal further comprising adjustment means for adjusting the gap width during operation.

11. The split mechanical seal according to claim 10, wherein said adjustment means comprises fluid introduction means for introducing a closing fluid to a rear surface of said first seal ring to provide a selectively variable closing force on said first seal ring for adjusting the gap width during operation.

12. The mechanical face seal claim 1, wherein said fluid is one of a barrier fluid and a process fluid.

13. The split mechanical seal according claim 1, wherein said means for introducing a fluid further comprises a groove formed in said first seal face.

14. The split mechanical seal according to claim 13, wherein said groove is continuous about said first seal face.

15. The split mechanical seal according to claim 13, wherein said groove is positioned to form two concentric seal faces on said first seal face thereby providing a dual seal between said first seal face and said second seal face.

16. The split mechanical seal according to claim 13, wherein said groove is positioned on said first seal face to form lands on both sides of said groove.