VARIABLE DISPLACEMENT SWASH PLATE TYPE COMPRESSOR

摘要

In the compressor of the present invention, a throttle hole is formed in a connection portion. The throttle hole extends from a control pressure chamber toward the inside of an outer sliding portion. In the compressor, when the pressure in the control pressure chamber is regulated, in addition to respective opening degree adjustments of a high-pressure passage and a low-pressure control valve, a refrigerant gas is discharged from the inside of the control pressure chamber to a swash plate chamber through the throttle hole. Lubricant is discharged from the throttle hole together with the refrigerant gas. Consequently, in the compressor, the lubricant is less easily stored in the control pressure chamber, and lubricant shortage in the swash plate chamber less easily occurs.

主权项

1. A variable displacement swash plate type compressor comprising:
a housing in which a suction chamber, a discharge chamber, a swash plate chamber, and a cylinder bore are formed; a drive shaft rotatably supported by the housing; a swash plate rotatable in the swash plate chamber according to the rotation of the drive shaft; a link mechanism provided between the drive shaft and the swash plate and configured to allow a change in an inclination angle of the swash plate with respect to a direction orthogonal to an axis of the drive shaft; a piston accommodated in the cylinder bore to be reciprocatingly movable; a conversion mechanism configured to reciprocatingly move, according to the rotation of the swash plate, the piston in the cylinder bore at a stroke corresponding to the inclination angle; an actuator capable of changing the inclination angle; and a control mechanism configured to control the actuator, wherein the swash plate chamber communicates with the suction chamber, the actuator includes:
a defining body provided on the drive shaft in the swash plate chamber;a movable body movable in axial direction of the drive shaft in the swash plate chamber; anda control pressure chamber defined by the defining body and the movable body and configured to move the movable body by an internal pressure in the control pressure chamber, the control mechanism includes:
a supply passage communicating with the discharge chamber and the control pressure chamber, and introducing a refrigerant in the discharge chamber into the control pressure chamber; anda bleed passage communicating with the control pressure chamber and the swash plate chamber, and discharging the refrigerant in the control pressure chamber to the swash plate chamber, and the bleed passage includes a communication path formed in at least one of the movable body and the defining body, and discharging lubricant from the control pressure chamber to the swash plate chamber together with the refrigerant.