Control valve for variable displacement compressor

A control valve applicable to a variable displacement compressor having a suction chamber, a discharge chamber, and a control chamber and having a discharge capacity varied by regulating a pressure in the control chamber, the control valve comprising:

• a first valve provided between the discharge chamber and the control chamber, to control a flow rate of refrigerant flowing from the discharge chamber to the control chamber;
• a second valve and a third valve provided parallel to each other between the control chamber and the suction chamber, to control a flow rate of the refrigerant flowing from the control chamber to the suction chamber;
• a body having a first passage through which the discharge chamber and the control chamber communicate with each other, and a second passage through which the control chamber and the suction chamber communicate with each other;
• a first control element that regulates the opening degree of the first valve by moving toward and away from a first valve hole formed in the first passage;
• a second control element that regulates an opening degree of the second valve by moving toward and away from a second valve hole formed in the second passage, wherein the second control element includes a third passage through which the control chamber and the suction chamber communicate with each other in parallel with the second passage;
• a third control element that regulates an opening degree of the third valve by moving toward and away from a third valve hole formed in the third passage;
• a solenoid to generate a drive force in a closing direction of the first valve and an opening direction of the second valve depending on an amount of supplied current;
• and
• a pressure sensing part to sense a pressure in the suction chamber or the pressure in the control chamber, and generate a counterforce against the drive force from the solenoid depending on a magnitude of the sensed pressure;
• and
• an actuating rod to transmit the drive force from the solenoid to at least the first control element and the second control element,
• wherein the second valve hole is formed in the body,
• wherein the second control element is formed integrally with the actuating rod,
• wherein when an opening degree of the first valve changes, the second valve opens while the third valve remains closed, and
• wherein when the first valve is closed, the second valve remains open and the third valve becomes openable depending on the magnitude of the sensed pressure.