Displacement control valve for variable displacement compressor

Abstract

The present invention provides a displacement control valve for a variable displacement compressor, the displacement control valve including a valve housing, in which a discharge chamber passage and a crank chamber passage are provided, and a valve body for opening and closing the valve, characterized in that a motor rotates the valve body to open and close the valve. Therefore, the present invention can reduce the overall length of the displacement control valve to reduce the size of the compressor, thereby achieving a compact structure of the compressor.

1 . A displacement control valve for a variable displacement compressor, the displacement control valve comprising a valve housing, in which a discharge chamber passage and a crank chamber passage are provided, and a valve body for opening and closing the valve, characterized in that a motor rotates the valve body to open and close the valve. 
   
   
       2 . The displacement control valve of  claim 1 , wherein the motor is a stepping motor and the opening degree of the valve is controlled by an input signal. 
   
   
       3 . The displacement control valve of  claim 2 , wherein a first discharge chamber passage and the crank chamber passage of the valve housing are connected to each other and a valve groove for controlling the opening degree between the first discharge chamber passage and the crank chamber passage is formed in the valve body. 
   
   
       4 . The displacement control valve of  claim 3 , wherein the first discharge chamber passage is formed to penetrate the center of the valve housing. 
   
   
       5 . The displacement control valve of  claim 3 , wherein the first discharge chamber passage is formed to penetrate a portion of an upper part of the valve housing. 
   
   
       6 . The displacement control valve of  claim 3 , wherein the valve groove is formed to penetrate the valve body in the longitudinal direction. 
   
   
       7 . The displacement control valve of  claim 1 , wherein the motor is an induction motor in which the rotational torque is determined by an input current and the displacement control valve further comprises a balance means for applying a force to the valve body in an opening direction of the valve. 
   
   
       8 . The displacement control valve of  claim 7 , wherein a first discharge chamber passage of the valve housing and the crank chamber passage are connected to each other and a valve groove for controlling the opening degree between the first discharge chamber passage and the crank chamber passage is formed in the valve body. 
   
   
       9 . The displacement control valve of  claim 8 , wherein the first discharge chamber passage is formed to penetrate the center of the valve housing. 
   
   
       10 . The displacement control valve of  claim 8 , wherein the first discharge chamber passage is formed to penetrate a portion of an upper part of the valve housing. 
   
   
       11 . The displacement control valve of  claim 8 , wherein the valve groove is formed to penetrate the valve body in the longitudinal direction. 
   
   
       12 . The displacement control valve of  claim 7 , wherein the balance means comprises:
 a movable groove formed in the valve housing;   a movable projection formed in the valve body and inserted into the movable groove; and   a spring inserted between the movable groove and the movable projection.   
   
   
       13 . The displacement control valve of  claim 7 , wherein the balance means comprises:
 a second discharge chamber passage formed in the valve housing;   a suction chamber passage formed in the valve housing; and   first and second pressure grooves formed in the valve body to correspond to the second discharge chamber passage and the suction chamber passage, respectively.   
   
   
       14 . The displacement control valve of  claim 13 , wherein an off-spring is inserted between the second discharge chamber passage and the first pressure groove. 
   
   
       15 . The displacement control valve of  claim 13 , wherein an off-spring is interposed between a centering groove formed in the valve housing and the valve body. 
   
   
       16 . The displacement control valve of  claim 1 , wherein a spring is inserted between the bottom of the valve housing and the bottom of the valve body.