Two stage reciprocating compressor

摘要

A reciprocating compressor includes :a low-pressure stage compression part (1) for compressing low-pressure working gas supplied from a supply source; two high-pressure stage compression parts (2;3) for compressing the working gas compressed by the low-pressure stage compression part (1) at two stages; and a crank mechanism (4) for driving the low-pressure stage compression part (1) and the high-pressure stage compression parts (2;3). The two high-pressure stage compression parts (2;3) each have a plunger and a cylinder and are arranged on both sides of the crank mechanism (4) in such a way as to extend coaxially opposite to each other. The low-pressure stage compression part (1) has a piston (17) and a cylinder (23) and is located in the middle of the two high-pressure stage compression parts (2;3). The crank mechanism (4), the low-pressure stage compression part (1), and the two high-pressure stage compression parts (2;3) are substantially located in the same plane.