| 摘要 |
A variable displacement swash plate type compressor includes a displacement control valve. The displacement control valve includes a drive force transmitting member, a valve member having a first valve body, a pressure sensing mechanism, which adjusts the valve opening degree of the first valve body, a communication passage, which connects a back pressure chamber and an accommodating chamber to each other, and a second valve body, which selectively opens and closes the communication passage. The first valve body opens when current supply to an electromagnetic solenoid is stopped and the pressure in a suction pressure zone is less than a threshold value. The second valve body closes when current is supplied to the electromagnetic solenoid and opens when the current supply to the electromagnetic solenoid is stopped and the pressure in the suction pressure zone is greater than or equal to the threshold value. |
| 主权项 |
1. A variable displacement swash plate type compressor comprising:
a housing having a crank chamber; a swash plate accommodated in the crank chamber, wherein the swash plate receives a drive force from a rotary shaft to rotate and is capable of changing its inclination angle relative to the rotary shaft; a piston engaged with the swash plate; a movable body, which is coupled to the swash plate and changes the inclination angle of the swash plate; a control pressure chamber defined in the housing by the movable body, wherein pressure in the control pressure chamber is changed by introducing control gas therein so that the movable body is moved in the axial direction of the rotary shaft; and a displacement control valve that controls the pressure in the control pressure chamber, wherein the piston is reciprocated by a stroke that corresponds to the inclination angle of the swash plate, the displacement control valve includes:
a drive force transmitting member, which is driven by an electromagnetic solenoid;a valve member having a first valve body, wherein the first valve body adjusts an opening degree of discharge passage that extends from the control pressure chamber to a suction pressure zone;a valve chamber, which accommodates the first valve body and communicates with the suction pressure zone;a back pressure chamber, which is located between the electromagnetic solenoid and the valve chamber and is connected to the valve chamber;an accommodating chamber, which communicates with the control pressure chamber;a pressure sensing mechanism, which is accommodated in the accommodating chamber and integrated with the valve member, wherein, by sensing, in at least one of the back pressure chamber and the valve chamber, a pressure in the suction pressure zone that acts on the valve member, the pressure sensing mechanism extends or contracts in the moving direction of the drive force transmitting member, thereby adjusting the valve opening degree of the first valve body;a communication passage, which is formed in the valve member and connects the back pressure chamber and the accommodating chamber to each other; anda second valve body, which is located between the drive force transmitting member and the valve member and selectively opens and closes the communication passage, the first valve body is in an open state when a current supply to the electromagnetic solenoid is stopped and the pressure in the suction pressure zone is less than a threshold value, and the second valve body closes when a current is supplied to the electromagnetic solenoid and opens when the current supply to the electromagnetic solenoid is stopped and the pressure in the suction pressure zone is greater than or equal to the threshold value. |
