公开(公告)号：US20020174661A1

公开(公告)日：2002-11-28

申请号：US10166577

申请日：2002-06-10

Applicant: Helix Technology Corporation

Inventor： Russell M. Sylvia

IPC: F25B009/00 ,  F25B001/00

CPC classification number: F16F1/328 ,  F25B9/14 ,  Y10S277/902 ,  Y10T29/49274

Abstract: A piston includes a circumferential groove having a seal ring and spring mounted within the groove. The spring exerts an axial force on the seal ring thereby preventing motion of the seal ring within the groove. Preferably, the spring in a wave spring, wherein small changes in deflection of the wave spring produces small changes in the load generated by the spring on the seal ring. The seal ring has at least one radial spring ring mounted within the seal ring to create a radial force on the seal ring. The piston can also include a sleeve that mounts to the piston body, the sleeve forming a wall of the groove. The piston can be a displacer mounted within a cylinder of a refrigerator.