Variable displacement type swash plate compressor

Abstract

The valve body has a first valve part and a second valve part. The first valve part has an end surface seal part that is brought into contact with a seat part of a first valve seat part and closes a bleed passage. The second valve part has an external surface seal part that enters the second valve hole and closes the supply passage. When the opening degree of the first valve part is maximum, the seal length of the external surface seal part along the moving direction of the valve body is shorter than the distance between the end surface seal part and the seat part along the moving direction of the valve body.

1 . A variable displacement type swash plate compressor comprising:
 a housing;   a rotation shaft;   a swash plate, which is housed in the housing and rotates by obtaining driving force from the rotation shaft, and an inclination angle of the swash plate relative to the rotation shaft varies;   a piston, which is 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, which is partitioned by the movable body and in which the movable body moves in an axial direction of the rotation shaft to change the inclination angle of the swash plate based on change of a pressure inside the control pressure chamber due to introduction of a refrigerant gas into the control pressure chamber; and   a capacity control valve that controls a pressure in the control pressure chamber,   the piston reciprocally moving by stroke according to the inclination angle of the swash plate, wherein   the capacity control valve comprises:   a valve body that reciprocally moves by operation of an electromagnetic solenoid;   a first valve seat part that has a first valve hole, which forms a part of a bleed passage from the control pressure chamber to a suction pressure region; and   a second valve seat part that has a second valve hole, which forms a part of a supply passage from a discharge pressure region to the control pressure chamber,   the valve body has:   a first valve part, which has an end surface seal part that closes the bleed passage by moving into contact with the first valve seat part; and   a second valve part that has an external surface seal part, which closes the supply passage by entering the second valve hole, and   when an opening degree of the first valve part is maximum, a seal length of the external surface seal part along a moving direction of the valve body is shorter than a distance between the end surface seal part and the first valve seat part.   
     
     
         2 . The variable displacement type swash plate compressor according to  claim 1 , wherein
 the valve body has a projecting part that projects from the end surface seal part toward the first valve seat part and also enters the first valve hole and closes the bleed passage, and   when the projecting part has entered the first valve hole, the second valve part opens.   
     
     
         3 . The variable displacement type swash plate compressor according to  claim 1 , wherein
 the second valve seat part is a separate body from a valve housing of the capacity control valve,   a biasing member is provided between the first valve seat part and the second valve seat part in the valve housing, and   the biasing member biases the second valve seat part toward a step part of the valve housing.   
     
     
         4 . The variable displacement type swash plate compressor according to  claim 3 , wherein
 the valve body has an external surface enlarged part that increases in size in a tapered manner from the external surface seal part to the end surface seal part.   
     
     
         5 . The variable displacement type swash plate compressor according to  claim 3 , wherein
 the first valve seat part is a separate body from the valve housing,   the first valve seat part is press-fitted to a press fitting part of the valve housing, and   before the first valve seat part is press-fitted to the press fitting part, a length of the biasing member is a free length.   
     
     
         6 . The variable displacement type swash plate compressor according to  claim 3 , further comprising:
 a press-fit member that is press-fitted to a press fitting part of the valve housing, wherein   the first valve seat part is a separate body from the valve housing,   the first valve seat part, the biasing member and the second valve seat part are arranged between the step part and the press-fit member, and   before the press-fit member is press-fitted to the press fitting part, a length of the biasing member is a free length.