Displacement Control Valve of Variable Displacement Inclined Plate-Type Compressor

Abstract

A displacement control valve of a variable displacement inclined plate-type compressor, the displacement control valve controlling the discharge displacement of the compressor by opening and closing a communication path between a discharge chamber and a crank chamber. The displacement control valve has a valve hole formed in the communication path and always communicating with the discharge chamber, a valve body for opening and closing the valve hole, a support hole provided coaxially with the valve hole, a support rod slidably inserted into the support hole and connected to the valve body, an electromagnetic solenoid for driving the valve body, and a pressure sensing chamber for introducing a suction pressure or crank chamber pressure of the compressor into the end section of the support rod which is on the side opposite to the side of the valve body. The displacement control valve can be made smaller than conventional displacement control valves.

1 . A displacement control valve of a variable displacement inclined plate-type compressor for controlling a discharge displacement of said compressor by opening and closing a communication path between a discharge chamber and a crank chamber of said compressor, said displacement control valve comprising: 
 a valve hole formed in said communication path and communicating with said discharge chamber;    a valve body for opening and closing said valve hole;    a support hole provided coaxially with said valve hole;    a support rod slidably inserted into said support hole and connected to said valve body;    an electromagnetic solenoid for driving said valve body; and    a pressure sensing chamber for introducing a suction pressure or crank chamber pressure of said compressor into an end section of said support rod which is on a side opposite to a side of said valve body.    
   
   
       2 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 1 , wherein a cross-sectional area of said valve hole is about equal to but greater than a cross-sectional area of said support rod.  
   
   
       3 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 1 , wherein a contact part of said valve hole with said valve body is made of a hard material.  
   
   
       4 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 1 , wherein said valve hole and said support hole are integrally formed by a hard material.  
   
   
       5 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 1 , wherein a valve housing formed with said valve hole and said support hole and containing said valve body and said support rod is made from a resin or an aluminum alloy.  
   
   
       6 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 2 , wherein a contact part of said valve hole with said valve body is made of a hard material.  
   
   
       7 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 2 , wherein said valve hole and said support hole are integrally formed by a hard material.  
   
   
       8 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 3 , wherein said valve hole and said support hole are integrally formed by a hard material.  
   
   
       9 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 6 , wherein said valve hole and said support hole are integrally formed by a hard material.  
   
   
       10 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 2 , wherein a valve housing formed with said valve hole and said support hole and containing said valve body and said support rod is made from a resin or an aluminum alloy.  
   
   
       11 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 3 , wherein a valve housing formed with said valve hole and said support hole and containing said valve body and said support rod is made from a resin or an aluminum alloy.  
   
   
       12 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 4 , wherein a valve housing formed with said valve hole and said support hole and containing said valve body and said support rod is made from a resin or an aluminum alloy.  
   
   
       13 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 6 , wherein a valve housing formed with said valve hole and said support hole and containing said valve body and said support rod is made from a resin or an aluminum alloy.  
   
   
       14 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 7 , wherein a valve housing formed with said valve hole and said support hole and containing said valve body and said support rod is made from a resin or an aluminum alloy.  
   
   
       15 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 8 , wherein a valve housing formed with said valve hole and said support hole and containing said valve body and said support rod is made from a resin or an aluminum alloy.  
   
   
       16 . The displacement control valve of a variable displacement inclined plate-type compressor according to  claim 9 , wherein a valve housing formed with said valve hole and said support hole and containing said valve body and said support rod is made from a resin or an aluminum alloy.