Variable displacement compressor

Abstract

A variable displacement compressor comprises a flange, a movable body, and a detection sensor. The flange is joined to a housing and forms a flange passage for connecting a refrigerant passage and an external refrigerant circuit. The movable body is movably disposed in the flange, is movable according to a flow rate of refrigerant gas in the flange passage, and has a magnet. The detection sensor is fixed to or in the flange for detecting magnetic flux density of the magnet. The flow rate of the refrigerant gas is detected based on the magnetic flux density detected by the detection sensor. The flange is attachable to and detachable from the housing in a state where the flange is provided with the movable body and the detection sensor.

1 . A variable displacement compressor comprising:
 a housing having a cylinder bore and a crank chamber;   a refrigerant passage formed in the housing, the refrigerant passage including a suction-pressure region and a discharge-pressure region;   a piston disposed in the cylinder bore;   a swash plate disposed in the crank chamber, wherein an inclination angle of the swash plate is controlled according to differential pressure between a pressure in the crank chamber and a pressure in the cylinder bore across the piston, and the pressure in the crank chamber is adjusted through a supply passage for supplying the pressure in the discharge-pressure region to the crank chamber and a bleed passage for releasing the pressure in the crank chamber to the suction-pressure region;   a flange joined to the housing, the flange forming a flange passage for connecting the refrigerant passage and an external refrigerant circuit;   a movable body movably disposed in the flange, the movable body being movable according to a flow rate of refrigerant gas in the flange passage, the movable body having a magnet; and   a detection sensor fixed to or in the flange for detecting magnetic flux density of the magnet, wherein the flow rate of the refrigerant gas is detected based on the magnetic flux density detected by the detection sensor, and the flange is attachable to and detachable from the housing in a state where the flange is provided with the movable body and the detection sensor.   
   
   
       2 . The variable displacement compressor according to  claim 1 , wherein a heat insulating member is provided between the flange and the housing. 
   
   
       3 . The variable displacement compressor according to  claim 2 , wherein the heat insulating member is a gasket which is formed of a heat insulating material. 
   
   
       4 . The variable displacement compressor according to  claim 1 , wherein a throttle is provided in the flange passage, and the movable body is movable by differential pressure between pressures in the flange passage upstream of and downstream of the throttle. 
   
   
       5 . The variable displacement compressor according to  claim 4 , wherein the throttle is formed by a partition of the flange. 
   
   
       6 . The variable displacement compressor according to  claim 1 , wherein the flange passage includes an accommodation chamber for disposing the movable body therein. 
   
   
       7 . The variable displacement compressor according to  claim 1 , wherein the detection sensor is fixed to the flange through a mounting member so that the detection sensor is spaced at a predetermined clearance from the flange. 
   
   
       8 . The variable displacement compressor according to  claim 7 , wherein the mounting member is formed of a heat insulating material. 
   
   
       9 . The variable displacement compressor according to  claim 1 , wherein the detection sensor is fixed in the flange through a mounting member. 
   
   
       10 . The variable displacement compressor according to  claim 9 , wherein the mounting member is formed of a heat insulating material. 
   
   
       11 . The variable displacement compressor according to  claim 1 , wherein the flange is formed of a heat insulating material.