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1. (WO2018108464) PISTON RING FOR A PISTON COMPRESSOR, AND PISTON COMPRESSOR

Pub. No.:    WO/2018/108464    International Application No.:    PCT/EP2017/079859
Publication Date: Fri Jun 22 01:59:59 CEST 2018 International Filing Date: Wed Nov 22 00:59:59 CET 2017
IPC: F16J 9/08
F04B 53/14
F16J 15/24
Applicants: BURCKHARDT COMPRESSION AG
Inventors: FEISTEL, Norbert
Title: PISTON RING FOR A PISTON COMPRESSOR, AND PISTON COMPRESSOR
Abstract:
The piston ring comprises an endless base ring (5) and a sealing ring (3) wherein the base ring (5) has a radially outwardly directed base ring face side (5a), and wherein the sealing ring (3) has a radially outwardly directed sealing face side (3e) and a radially inwardly directed, circularly running sealing ring inner side (3f), wherein the sealing ring (3) has three tangential cuts (3d) which extend tangentially with respect to the sealing ring inner side (3f), such that the sealing ring (3) comprises three sealing ring segments (3a, 3b, 3c) which are arranged in succession in a circumferential direction (U) and which are separated by the tangential cut (3d), wherein the endless base ring (5) and the sealing ring (3) are arranged in succession in a longitudinal direction (L) running perpendicular to the circumferential direction (U), wherein a top ring (2) is arranged so as to adjoin the sealing ring (3) in the longitudinal direction (L), wherein the top ring (2) has a radially outwardly directed top ring outer side (2c) and a radially inwardly directed top ring inner side (2d), wherein the top ring (2) has, on the side averted from the sealing ring (3), at least one radially running return flow channel (2a) which extends in a radial direction along the entire width of the top ring (2), wherein the sealing face side (3e) protrudes in a radial direction beyond the top ring outer side (2c) and the base ring face side (5a), and wherein the base ring (5) and the top ring (2) have a greater tensile strength than the sealing ring (3).