Piston type variable displacement compressor

A compressor having an internal refrigerant gas passage selectively connected to and disconnected with an external refrigerant circuit separately provided from the compressor, said compressor having a plurality of reciprocable pistons for compressing gas, said compressor comprising:

• a housing having a discharge chamber and a refrigerant suction;
• a crank chamber defined in the housing;
• a plurality of cylinder bores formed in the housing, each cylinder bore communicating to the discharge chamber and the refrigerant suction passage and accommodating each piston;
• a drive shaft rotatably supported by the housing;
• a swash plate supported on the drive shaft for integral rotation with inclining motion with respect to the drive shaft, said swash plate being movable between a maximum inclined angle and a minimum inclined angle;
• a rotary valve disposed in the middle of the internal refrigerant gas passage for synchronously rotating with the drive shaft, said rotary valve having a refrigerant supply passage for sequentially supplying the refrigerant gas in the internal refrigerant gas passage to each cylinder bore;
• and
• disconnecting means for disconnecting said external refrigerant circuit from the internal refrigerant gas passage when the swash plate is at the minimum inclined angle.