Variable capacity compressor having a control valve with channels

A control valve for a variable capacity compressor, 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, wherein the operating unit comprises:
• a plunger slidably combined to one end of a needle,
• a feed valve unit combined to the plunger to open or close the control channel by interworking and moving with the plunger, and comprising the second bleeding channel penetrating through an axial center area from an inlet hole formed at one end of the feed valve unit to communicate with an outlet hole formed at the outer circumferential side surface and communicate with the first bleeding channel, and
• a bleeding valve unit provided in the feed valve unit and adjusting opening and closing of the second bleeding channel;
• 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 the driving unit comprises:
• the needle disposed in the valve body, and
• a solenoid provided at the valve body to apply an operating force for reciprocally moving the operating unit,
• 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, 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.