Reciprocating compressor

1. A reciprocating compressor comprising:

a compression part compressing, by a piston, gas sucked into a cylinder through a suction valve, and discharging the compressed gas through a discharge valve;

a piston drive part supplying a force to the piston to reciprocate the piston via a rod coupled to the piston; and

a container part accommodating the compression part and forming a vacuum region around the compression part,

further comprising an intermediate tube part disposed between the piston drive part and the container part, and accommodating the rod,

wherein the intermediate tube part forms a first intermediate chamber, a second intermediate chamber, and a third intermediate chamber,

the first intermediate chamber, the second intermediate chamber, and the third intermediate chamber are disposed in the order of the first intermediate chamber, the second intermediate chamber, and the third intermediate chamber in a direction from the piston drive part toward the container part,

the first intermediate chamber is filled with a type of gas different from the gas sucked into the cylinder, and

the third intermediate chamber is filled with a type of gas identical to the gas sucked into the cylinder.

2. The reciprocating compressor according to claim 1 ,

wherein the suction valve is formed in the cylinder, and is capable of alternately switching between an open mode allowing entry and exit of the gas to and from the cylinder and a closed mode inhibiting the entry and exit of the gas according to an internal pressure of the cylinder, and

the reciprocating compressor further includes an unloader disposed on an outer surface side of the container part, and configured to force the closed mode of the suction valve to be switched to the open mode by receiving a supply of compressed gas.

3. The reciprocating compressor according to claim 1 , wherein a liquefaction temperature of the gas is lower than the liquefaction temperature of oxygen or the liquefaction temperature of nitrogen.

4. The reciprocating compressor according to claim 1 ,

wherein the gas sucked into the cylinder is hydrogen gas,

the first intermediate chamber is filled with nitrogen gas, and

the third intermediate chamber is filled with hydrogen gas.

5. A reciprocating compressor comprising:

a compression part compressing, by a piston, gas sucked into a cylinder through a suction valve, and discharging the compressed gas through a discharge valve;

a piston drive part supplying a force to the piston to reciprocate the piston via a rod coupled to the piston; and

a container part accommodating the compression part and forming a vacuum region around the compression part,

wherein the container part includes a housing forming the vacuum region, and a cylinder holding part disposed between the housing and the cylinder,

wherein the cylinder holding part includes a pedestal base part fixed to a side surface of the cylinder, and a pedestal coupling part coupled to the housing via an outer circumferential pedestal being fixed to an inner surface of the housing, and

the pedestal coupling part is movable relatively along a movement direction of the piston with respect to the pedestal base part.

6. The reciprocating compressor according to claim 5 ,

wherein a cross-sectional shape of a base part main surface where the pedestal base part is in contact with a pedestal coupling part is triangular,

a cross-sectional shape of a coupling main surface of the pedestal coupling part being in contact with the base part main surface is valley like, and

a ridgeline of the base part main surface extends in the movement direction of the piston.

7. The reciprocating compressor according to claim 5 , wherein the cylinder holding part further comprises an elastic part interposed between the pedestal coupling part and the outer circumferential pedestal, and being fixed to the pedestal coupling part.

8. The reciprocating compressor according to claim 7 ,

wherein the elastic part allows the pedestal coupling part and the pedestal base part to move relatively with respect to the outer circumferential pedestal.

9. The reciprocating compressor according to claim 7 ,

wherein the elastic part allows the pedestal coupling part and the pedestal base part to move in a direction orthogonal to the movement direction of the piston with respect to the outer circumferential pedestal.