MACHINE OF POSITIVE DISPLACEMENT ACTION Russian patent published in 2014 - IPC F04B19/06 

FIELD: machine building.

SUBSTANCE: machine consists of a cylinder 1 with a differential piston of U-shaped longitudinal section and two cavities: 3-pump one and 4 - compressor one. The inner part of the piston 2 is mating the outer surface of a crosshead lead-in segment 5 of U-shaped longitudinal section, the crosshead 6 is fitted by the inner lead-in segment along which the crosshead itself is sliding, the crosshead is hingedly coupled to a connecting rod 7 of a crank drive of the machine and coupled to the piston 2 via a rod 8. The piston 2 is fitted by a piston seal 9, and the crosshead lead-in 5 - by a seal 10. The inner cavity 12 of the piston 2 is connected with the suction line by a channel 11. Back pressure gas valves 13 and 14 are used to arrange the operation of the compressor cavity 4, fluid valves of the same type 15 and 16 - to arrange the operation of the pump cavity 3. U-shaped design of the piston and the crosshead lead-in provides for the creation of long seals at short length of the cylinder and piston group.

EFFECT: high leakproofness of operating cavities and reduced cross vibrations deteriorating the unit performance.

2 dwg