| 摘要 |
Overpressure of refrigerant in a refrigerant circuit is avoided. A swash plate type variable displacement compressor includes a muffler (muffler space 123) at the top of a cylinder block 101 thereof. The muffler space 123 is connected to a communication passage communicating with a discharge chamber of the compressor, and in this connecting portion, a check valve 200 for suppressing a backflow of the refrigerant is provided. The muffler space 123 communicates with a discharge-side external refrigerant circuit via a discharge port. An inlet port of the high-pressure relief valve 250 in the muffler space 123 communicates with the muffler space 123 located on downstream side of the check valve 200, and an outlet port thereof communicates with a crank chamber 105 of the compressor through communication passages 101c and 101d of the cylinder block 101. The crank chamber 105 communicates with a suction chamber of the compressor through a gas bleeding passage. The high-pressure relief valve 250 is opened when pressure in the muffler space 123 increases to overpressure to flow refrigerant at a high pressure into the crank space 105 from the muffler space 123 through the communication chambers 101c and 101d.
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