Piston compressor including a suction throttle

A piston compressor including a suction throttle, the piston compressor comprising:

• a housing including a cylinder block having a plurality of cylinder bores, the housing having a discharge chamber, a swash plate chamber, and an axial hole;
• a drive shaft rotatably supported in the axial hole;
• a fixed swash plate rotatable in the swash plate chamber by rotation of the drive shaft, wherein an inclination angle of the fixed swash plate with respect to a plane perpendicular to an axis of the drive shaft is constant;
• a plurality of pistons forming a plurality of compression chambers in the respective cylinder bores and coupled to the fixed swash plate;
• a discharge valve discharging refrigerant gas in the compression chambers into the discharge chamber;
• a rotating body provided on the drive shaft and rotatable integrally with the drive shaft and movable in a direction of the axis of the drive shaft with respect to the drive shaft based on a control pressure;
• and
• a control valve configured to control the control pressure,
• wherein the cylinder block has a plurality of first communication passages communicating with the respective cylinder bores,
• wherein the rotating body has a second communication passage that communicates with the first communication passages intermittently by the rotation of the drive shaft,
• wherein a flow rate of refrigerant gas discharged from the compression chambers into the discharge chamber decreases when a communication angle around the axis, at which the second communication passage communicates with the first communication passages, increases per one rotation of the drive shaft depending on a position of the rotating body in the direction of the axis,
• wherein the piston compressor includes the suction throttle that decreases a flow rate of refrigerant gas into the compression chambers when the communication angle increases based on the control pressure,
• wherein the housing has a suction port that opens to an outside of the housing, and
• wherein the suction throttle is disposed in a passage from the suction port to the second communication passage, and the suction throttle is operable to change a communicating area of the passage.