Control valve for variable displacement compressor

A compressor used in a refrigerant circuit of an air conditioner comprising:

• a control chamber, wherein the compressor displacement is changed by adjusting the pressure in the control chamber;
• a bleed passage connecting the control chamber to a suction pressure zone of the refrigerant circuit;
• a supply passage connecting a discharge pressure zone of the refrigerant circuit to the control chamber;
• and
• a control valve for changing the displacement of a compressor, wherein the control valve includes:
• an accommodation cylinder;
• a coil located about the accommodation cylinder;
• a stator located in the accommodation cylinder;
• a plunger located in the accommodation cylinder, wherein, when electric current is supplied to the coil, electromagnetic force is generated between the stator and the plunger and the plunger moves relative to the stator in the accommodation cylinder, accordingly;
• and
• a valve body coupled to the plunger, wherein, when the plunger moves, the valve body moves accordingly and adjusts the opening degree of a valve hole;
• wherein a flat surface and a peripheral wall surrounding the flat surface are formed in an end of one of the plunger and the stator that faces the other one of the plunger and the stator, wherein the peripheral wall has a tapered cross-section with an inclined inner surface, and wherein the inclined inner surface and the flat surface define a recess;
• wherein a frustum portion is formed in an end of the other one of the plunger and the stator that faces the recess, wherein the frustum portion includes a flat distal surface and an annular inclined surface;
• and
• wherein the taper angle of the peripheral wall is equal to or less than twenty degrees, and wherein the diameter of the flat distal surface of the frustum portion is equal to or greater than eighty percent of the largest diameter.