PISTON RING AND PISTON COMPRESSOR WITH DRY RUNNING Russian patent published in 2001 - IPC

FIELD: manufacture of compressors. SUBSTANCE: piston ring includes first and second rings with annular gaps. Rings are arranged concentrically one relative to another around axis C. First ring with L-shaped cross section has first portion passing along axis C and second portion passing radially outside relative to axis C. Surfaces of second ring turned to first ring are in contact with inner surfaces of first ring and they have corresponding shape. Inner surface of second portion of first ring is inclined radially relative to axis C. Rings are made of plastics modified with grease material. EFFECT: improved design providing uniform wear of ring surfaces. 2 cl, 7 dwg