| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas compressor reducing power required for operating a compressor by preventing over-compression of high pressure coolant gas, and preventing noise of the compressor and breakage of a valve plate generated by over-compression. SOLUTION: A discharge valve 37 is disposed at a discharging chamber side opening end 16b of a discharge hole 16 opening to a compression chamber 9 side at one end and opening to a discharge chamber 7 side at the other end. The discharge valve 37 comprises a valve plate 32 elastically deforming so as to block the discharge chamber side opening end 16b of the discharge hole 16 by pressure in the compression chamber 9 and open the discharge chamber side opening end 16b of the discharge hole 16 when the pressure in the compression chamber 9 exceeds pressure in the discharge chamber 7, a pressure supply passage 41 communicating from a spot facing surface 36 of the valve plate 32 into the compression chamber 9, and an over-compression releasing means 35 releasing the pressure in the compression chamber 9 to the discharge chamber 7 side by sliding the valve plate 32 to the discharge chamber 7 side with pressure supplied from the pressure supply passage 41 when high pressure coolant gas in the compression chamber 9 is over-compressed. The pressure over-compressed in the compression chamber 9 is released from the discharge chamber side opening end 16b of the discharge hole 16 and a clearance 51 on a lower surface of a valve seat 31 to the discharge chamber 7 side.
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