Refrigerant suction structure in fixed displacement type piston compressor, and operation control method in fixed displacement type piston compressor

摘要

An introduction passage (31) of rotary valve (35, 36) has outlets (312, 313) for feeding out refrigerant in a suction pressure zone (142) toward each of compression chambers (271, 281). A switch portion in a shutoff state shuts off a portion (142) of the suction pressure zone within a compressor (10) from the outlets (312, 313) of the introduction passage (31). The switch portion includes a valve body (42), a working pressure chamber (412), and a working pressure applying portion (48, 67-68). The working pressure chamber (412) introduces a working pressure that is applied to the valve body (42) so as to arrange the valve body (42) at a communication position. The pressure in the suction pressure zone (142) acts against the pressure in the working pressure chamber (412) through the valve body (42).