To provide a reciprocating compressor in which a sufficient discharge pressure can be obtained even in the case of small cylinder diameter.
Two chambers, i.e. a suction chamber 18A and a discharge chamber 18B are defined by a piston 4 to which a piston rod 3 is coupled within a cylinder 2. The suction chamber 18A communicates with the atmosphere via a suction valve 19. The discharge chamber 18B is connected to an air tank 10 via a discharge valve 21. The suction chamber 18A and the discharge chamber 18B are connected to each other by a pipeline 22, and a first and a second check valves 23, 24 are provided to the pipeline 22. The piston 4 is reciprocated by a motor 6, and an atmospheric air having been introduced into the suction chamber 18A via the suction valve 19 is supplied to the discharge chamber 18B via the first and the second check valves, and further compressed air is supplied from the discharge chamber 18B to an air tank 10 via the discharge valve 21. A high discharge pressure can be obtained by the multistage compression of the compressed air by means of the suction chamber 18A and the discharge chamber 18B.
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