| 摘要 |
A non-contact mechanical seal for making a substantially fluid-tight seal around a rotatory shaft with a seal case (2); a rotatory shaft (4); a first stationary sealing ring (3) having a first sealing face (3a); spring retaining means (5) fixedly secured to said shaft; a second rotatory sealing ring (6) having a second sealing face (6a); connecting means (5,150,160) for connecting said second sealing ring to said shaft for rotation therewith; spring means (7) between said spring retaining means and said second sealing ring; secondary sealing means (14) for sealing between the second sealing ring and said shaft; and means (15-19) for admitting a sealing fluid (8) between said first and second sealing faces (3a,6a) at a pressure greater than the pressure of the fluid to be sealed and a sleeve member (13) that is connected to said shaft for rotation therewith and is disposed around the second sealing ring; two axially spaced, elastic sealing ring members (22) positioned between said sleeve member and said second sealing ring, which sealing ring member (22) define an annular space (23) between said sleeve member (13) and said second sealing ring (6); abutment means on said second sealing ring and associated with each of said elastic sealing ring members and adapted to prevent axial movement of said elastic sealing members away from each other relative to said second sealing ring; and means (24) for admitting a pressurised sealing fluid into said annular space for compressing said elastic sealing ring members axially, thereby to expand said sealing ring members radially, thereby holding said second sealing ring firmly within said sleeve member to reduce substantially pneumatic hammering of said second sealing ring.
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