Valve structure, nonlubricated linear compressor, and cryocooler

A valved nonlubricated linear compressor, comprising

• a compressor container,
• a cylinder housed in the compressor container,
• a movable piston accommodated in the cylinder, the movable piston partitioning the compressor container into a high-pressure chamber and a low-pressure chamber, wherein
• the cylinder partitions the high-pressure chamber into a pressurization chamber formed between the movable piston and the cylinder, and a discharge chamber formed inside the cylinder,
• a discharge pipe is connected to the discharge chamber, and a suction pipe is connected to the low-pressure chamber,
• the movable piston comprises an intake valve for supplying gas from the low-pressure chamber to the pressurization chamber,
• the cylinder comprises a discharge valve for discharging the gas from the pressurization chamber to the discharge chamber, and
• at least one of the intake valve and the discharge valve is constituted by a valve structure comprising:
• a fixing member;
• a valve seat part including a valve hole portion positioned on a side of the valve seat part with respect to the fixing member, the valve hole portion having a valve hole either connecting the high-pressure chamber to the low-pressure chamber, or connecting the discharge chamber to the pressurization chamber, and a valve-body supporting wall part positioned on an opposite side of the valve seat part with respect to the fixing member, the valve-body supporting wall part extending laterally from the valve hole portion, wherein no valve hole is present in the valve-body supporting wall part;
• an elastic valve-body member furnished with
• a valve-body fulcrum portion fixed to the valve seat part with the fixing member,
• a first elastic platelike section separated from the valve-body fulcrum portion by a slit and disposed paralleling the valve hole portion so as to cover the valve hole, and
• a second elastic platelike section extending from the valve-body fulcrum portion opposite-ward with respect to the slit and paralleling the valve-body supporting wall part, wherein
• the first and second elastic platelike sections are continuous to each other,
• the first elastic platelike section is elastically deformable relative to the second elastic platelike section under pressure differential either between the high-pressure chamber and the low-pressure chamber, or between the discharge chamber and the pressurization chamber, so as to uncover the valve hole;
• and
• a fan-shaped elastic pressing member furnished with
• a pressing-member fulcrum portion fixed to the valve seat part with the fixing member, and
• a pressing-member elastic platelike section extending from the pressing-member fulcrum portion opposite-ward with respect to the slit and paralleling the second elastic platelike section so as to elastically deform together with the elastic valve-body member, the fan-shaped elastic pressing member being of planar form configured so as to expose the first elastic platelike section;
• wherein
• the pressing-member elastic platelike section and the second elastic platelike section of the elastic valve-body member are fan-shaped to match each other in plan view form.