Scroll Compressor

Abstract

A scroll compressor with high efficiency is provided according to the present invention. The scroll compressor compresses a refrigerant by meshing of an orbiting scroll and a fixed scroll, wherein the orbiting scroll includes a back pressure hole which intermittently connects a compression chamber and a back pressure chamber per one orbit of the orbiting scroll, and the back pressure hole communicates with the compression chamber and also with the back pressure chamber and shuts off the communication with the back pressure chamber after the communication with the compression chamber is shut off.

1 . A scroll compressor, comprising:
 a fixed scroll in which a spiral wrap is vertically provided on a base plate;   an orbiting scroll in which a spiral wrap is vertically provided on an end plate, the orbiting scroll meshing with the fixed scroll to form a compression chamber;   a discharge space to which a working fluid having been compressed in the compression chamber is discharged;   a back pressure chamber provided in a back surface of at least any one of the orbiting scroll and the fixed scroll to press at least one of both members of the orbiting scroll and the fixed scroll against the other one of the members; and   a back pressure hole formed in an end plate of at least any one of the fixed scroll and the orbiting scroll to provide communication between the compression chamber and the back pressure chamber to keep a pressure in the back pressure chamber at a pressure between a suction pressure and a discharge pressure, wherein   the compression chamber and the back pressure chamber intermittently communicate with each other through the back pressure hole per one orbit of the orbiting scroll, and   a communication port of the back pressure hole on a back pressure chamber side is blocked later than a communication port of the back pressure hole on a compression chamber side.   
     
     
         2 . A scroll compressor, comprising:
 a fixed scroll in which a spiral wrap is vertically provided on a base plate;   an orbiting scroll in which a spiral wrap is vertically provided on an end plate, the orbiting scroll meshing with the fixed scroll to form a compression chamber;   a discharge space to which a working fluid having been compressed in the compression chamber is discharged;   a back pressure chamber provided in a back surface of the end plate of the orbiting scroll to press the orbiting scroll against the fixed scroll; and   a back pressure hole formed in the end plate of the orbiting scroll to provide communication between the compression chamber and the back pressure chamber to keep a pressure in the back pressure chamber at a pressure between a suction pressure and a discharge pressure, wherein   the compression chamber and the back pressure chamber intermittently communicate with each other through the back pressure hole per one orbit of the orbiting scroll, and   a communication port of the back pressure hole on a back pressure chamber side is blocked later than a communication port of the back pressure hole on a compression chamber side.   
     
     
         3 . The scroll compressor according to  claim 1 , wherein the communication port of the back pressure hole on the back pressure chamber side communicates with the back pressure chamber until the communication port of the back pressure hole on the compression chamber side is completely blocked. 
     
     
         4 . The scroll compressor according to  claim 1 , wherein as a structure for the intermittent communication between the compression chamber and the back pressure chamber through the back pressure hole, a cutout portion is provided in the end plate of the fixed scroll to communicate with the back pressure chamber so that the communication port of the back pressure hole on the back pressure chamber side that is provided in the orbiting scroll is caused to communicate with the cutout portion. 
     
     
         5 . A refrigeration cycle apparatus for air-conditioning which is constituted by using the scroll compressor according to  claim 1 . 
     
     
         6 . A scroll compressor which compresses a refrigerant by meshing of an orbiting scroll and a fixed scroll, wherein
 the orbiting scroll comprises a back pressure hole which intermittently connects a compression chamber and a back pressure chamber per one orbit of the orbiting scroll, and   the back pressure hole communicates with the compression chamber and also with the back pressure chamber, and shuts off the communication with the back pressure chamber after the communication with the compression chamber is shut off.   
     
     
         7 . The scroll compressor according to  claim 6 , wherein timing of the communication is regulated by using a cutout portion provided in the fixed scroll. 
     
     
         8 . A refrigeration cycle apparatus for air-conditioning which is constituted by using the scroll compressor according to  claim 2 . 
     
     
         9 . A refrigeration cycle apparatus for air-conditioning which is constituted by using the scroll compressor according to  claim 3 . 
     
     
         10 . A refrigeration cycle apparatus for air-conditioning which is constituted by using the scroll compressor according to  claim 4 .