Compressor and hydrogen station

Abstract

A cylinder in a compression stage is provided with a first cooling channel through which a cooling fluid for absorbing heat generated between the cylinder and a first piston ring group flows, a second cooling channel through which a cooling fluid for absorbing heat generated between the cylinder and a second piston ring group flows, and a through hole penetrating a side wall of the cylinder in an intermediate part between the first cooling channel and the second cooling channel A hydrogen gas leaking from a compression chamber to the intermediate part through between the cylinder and a piston and then guided to a leak line. The leak line includes a piping part and a volume expansion unit in which volume in a predetermined distance range is larger than volume of the piping part at the same distance range as the predetermined distance range.

1 . A compressor for compressing a hydrogen gas, the compressor comprising:
 a plurality of compression stages; and   a drive mechanism configured to drive the plurality of compression stages,   wherein at least one compression stage out of the plurality of compression stages includes:   a cylinder;   a piston inserted into the cylinder;   a first piston ring group installed on the piston; and   a second piston ring group installed on the piston closer to the drive mechanism than the first piston ring group,   the cylinder is provided with:   a first cooling channel through which a cooling fluid for absorbing heat generated between the cylinder and the first piston ring group flows;   a second cooling channel through which the cooling fluid for absorbing heat generated between the cylinder and the second piston ring group flows; and   a through hole penetrating a side wall of the cylinder from an inner surface to an outer surface of the cylinder in an intermediate part between the first cooling channel and the second cooling channel,   the compressor further includes a leak line connected to the through hole, the hydrogen gas leaking from a compression chamber in the cylinder into the intermediate part through between the cylinder and the piston and then guided into the leak line through the through hole, and   the leak line includes a piping part and a volume expansion unit in which volume within a predetermined distance range is larger than volume of the piping part at a distance range identical to the predetermined distance range.   
     
     
         2 . The compressor according to  claim 1 , wherein
 the leak line is connected to a suction side channel of the at least one compression stage, or a channel having pressure lower than the suction side channel.   
     
     
         3 . The compressor according to  claim 1 , wherein
 the volume expansion unit is a hollow tubular filter connected to the piping part, and   an inner diameter of a channel part of the hydrogen gas in the filter is larger than an inner diameter of the piping part.   
     
     
         4 . The compressor according to  claim 1 , wherein
 the volume expansion unit includes a pipe formed in a meandering shape, a spiral shape, or a helical shape.   
     
     
         5 . A hydrogen station comprising:
 the compressor according to  claim 1 ;   an accumulator for storing the hydrogen gas discharged from the compressor; and   a dispenser for receiving supply of the hydrogen gas from the accumulator.