| 摘要 |
1,117,290. Piston rings. WORTHINGTON CORPORATION. 20 March, 1967 [15 April, 1966], No. 12947/67. Heading F2T. A controlled leakage piston ring assembly for a compressor comprises a ring carrier 9 which is axially movable in a groove and provided with radial and axial passages 16, 17 for permitting gas to pass from one side of the piston ring 8 to the other on the compression stroke; during the return stroke, the ring carrier moves to close the clearance C and seal off the passages. The ring 8 may be made of P.T.F.E. or carbon and the carrier of metal. A group of such piston ring assemblies may be provided at each end of a double-acting piston, the clearance spaces C being controlled to evenly distribute the gas pressure. |
