Control valve for a variable capacity compressor and method for manufacturing same

A control valve for a variable capacity compressor, which pressurizes a refrigerant sucked from a suction chamber by using a plurality of pistons that reciprocally move by being combined to a swash plate disposed in a crank chamber, and then discharges the refrigerant to a discharge chamber, the control valve comprising:

• a valve body externally comprising a crank-chamber port communicating with the crank chamber, a discharge port communicating with the discharge chamber, and a suction port communicating with the suction chamber, and internally comprising a control channel formed such that the crank-chamber port and the discharge port communicate with each other, and a first bleeding channel formed such that the crank-chamber port and the suction port communicate with each other;
• an operating unit provided inside the valve body and comprising a second bleeding channel communicating from a center area to a side surface of the operating unit;
• and
• a driving unit provided inside the valve body and reciprocally moving the operating unit according to a current applied from an external source,
• wherein when the variable capacity compressor is in a normal state, the control channel is opened and the first and second bleeding channels are closed, and thus the refrigerant in the discharge chamber flows through the control channel and enters the crank chamber to control an angle of the swish plate by adjusting a pressure in the crank chamber, and
• when a pressure in the suction chamber is increased or the pressure of the crank chamber is in an abnormally high bleeding state, the operating unit is moved to close the control channel and the first and second bleeding channels are communicated with each other and opened, and thus the refrigerant in the crank chamber flows through the first and second bleeding channels and enters the suction chamber, thereby lowering the pressure in the crank chamber.