| 摘要 |
A static leak seal assembly for use in a conventional compressor for preventing high pressure gas leakage from occurring through the spaces between a movable piston rod and a frame of the machine when the rod is motionless is disclosed. A piston is mounted on the rod for axial movement between retracted and extended positions. A follower ring is disposed around the rod and is likewise movable in an axial direction along the rod between retracted and extended positions in response to corresponding movement of the piston. When moved to its extended position by the piston, the follower ring engages a compressible, resilient collar to compress a neck of the collar inwardly against the rod to effect a substantially fluid tight seal therearound. The ring is separate and distinct from the piston to permit the former to adjust in radial disposition about the rod to uniformly compress the collar neck against the rod around the entire periphery of the latter. Springs located in recesses formed around a sealing ring containment plate bias the piston to its retracted position to relieve the pressure of the ring from the collar neck when the rod is in motion. A fluid circuit drives the piston from a retracted to an extended position in opposition to the springs when the compressor is shut down and the rod becomes motionless.
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