DIFFERENTIAL COMPOSITE PISTON (VERSIONS) Russian patent published in 2014 - IPC F04B53/14 F16J1/12 

FIELD: machine building.

SUBSTANCE: proposed group of inventions relates to the field of machine building, namely, to compressor building, and may be used in cylinders of different purpose, in particular, in cylinder-piston units of piston compressors. A differential composite piston according to the version 1 comprises a stem (1) with a thrust collar (2), pistons of low (3) and high (4) pressures. The low-pressure piston (3) is made with an axial hole and is placed onto the stem (1) until the thrust collar (2). The high-pressure piston (4) is made as solid and is fixed on the stem (1) at the side of placement of the low-pressure piston (3) with the help of a threaded joint. At the same time the high-pressure piston (4) presses the low-pressure piston (3) to the thrust collar (2) of the stem (1). At the same time between high (4) and low (3) pressure pistons there is a crown-shaped washer (5). A differential composite piston according to the version 2 comprises a stem (1) with a thrust collar (2), pistons of low (3) and high (4) pressures. The low-pressure piston (3) is made with an axial hole and is placed onto the stem (1) until the thrust collar (2). The high-pressure piston (4) is made as hollow and is fixed on the stem (1) at the side of placement of the low-pressure piston (3) with the help of a threaded joint. At the same time the high-pressure piston (4) presses the low-pressure piston (3) to the thrust collar (2) of the stem (1). At the same time between high (4) and low (3) pressure pistons there is a crown-shaped washer (5).

EFFECT: simplified design, and also prevention of self-unscrewing of a high-pressure piston with simultaneous pressing of a low-pressure piston to a thrust collar of the stem.

6 cl, 2 dwg