Rotary compressor

Abstract

A rotary compressor includes a compressing section including a cylindrical cylinder, two end plates closing both ends of the cylinder, respectively, and a piston held by an eccentric section of a rotary shaft driven to rotate by a motor. A working chamber is formed between the piston and the cylinder inner wall. The rotary compressor also includes a vane protruding from within a vane groove of the cylinder into the working chamber; an airtight compressor housing accommodating therein the compressing section; a suction hole provided in the cylinder and communicating the suction chamber with a low-pressure side of a refrigerating cycle; and a discharge hole provided in one of the end plates and communicating the compression chamber with a high-pressure side of the refrigerating cycle. An auxiliary discharge hole different from the discharge hole is provided in the one end plate.

1 . A rotary compressor comprising:
 a compressing section including
 a cylindrical cylinder, 
 two end plates closing both ends of the cylinder, respectively, 
 a piston held by an eccentric section of a rotary shaft driven to rotate by a motor, and revolving in the cylinder along a cylinder inner wall of the cylinder, a working chamber being formed between the piston and the cylinder inner wall, and 
 a vane protruding from within a vane groove of the cylinder into the working chamber, abutting on the piston, and dividing the working chamber into a suction chamber and a compression chamber; 
   an airtight compressor housing accommodating therein the compressing section;   a suction hole provided in the cylinder and communicating the suction chamber with a low-pressure side of a refrigerating cycle; and   a discharge hole provided in one of the end plates and communicating the compression chamber with a high-pressure side of the refrigerating cycle,   wherein an auxiliary discharge hole different from the discharge hole is provided in the one end plate.   
   
   
       2 . The rotary compressor according to  claim 1 , wherein
 discharge valves are provided in the discharge hole and the auxiliary discharge hole, respectively, and   concave portions accommodating therein the discharge valves are separately provided in each of the end plates, respectively.   
   
   
       3 . The rotary compressor according to  claim 1 , wherein
 integrated L-shaped discharge valves are provided in the discharge hole and the auxiliary discharge hole, respectively, and   a concave portion accommodating therein the integrated L-shaped discharge valves and having a fixed portion common to the L-shaped discharge valves is provided in each of the end plates.   
   
   
       4 . The rotary compressor according to  claim 1 ,
 wherein a discharge groove communicating with the discharge hole is provided in a region of the cylinder inner wall corresponding to a position of the discharge hole provided in the one end plate, and no discharge groove is provided in a region of the cylinder inner wall corresponding to a position of the auxiliary discharge hole provided in the one end plate.   
   
   
       5 . A rotary compressor comprising:
 a low-stage compressing section including
 a cylindrical low-stage cylinder, 
 a low-stage end plate closing one end of the low-stage cylinder, 
 a low-stage piston held by a low-stage eccentric section of a rotary shaft driven to rotate by a motor and revolving in the low-stage cylinder along a low-stage cylinder inner wall of the low-stage cylinder, a low-stage working chamber being formed between the low-stage piston and the low-stage cylinder inner wall, and 
 a low-stage vane protruding from within a low-stage vane groove of the low-stage cylinder into the low-stage working chamber, abutting on the low-stage piston, and dividing the low-stage working chamber into a low-stage suction chamber and a low-stage compression chamber; 
   a high-stage compressing section stacked on the low-stage compressing section via an intermediate partition plate, the high-stage compressing section including
 a cylindrical high-stage cylinder, 
 a high-stage end plate closing one end of the high-stage cylinder, 
 a high-stage piston held by a high-stage eccentric section of the rotary shaft driven to rotate by the motor, and revolving in the high-stage cylinder along a high-stage cylinder inner wall of the high-stage, a high-stage working chamber being formed between the high-stage piston and the high-stage cylinder inner wall, and 
 a high-stage vane protruding from within a high-stage vane groove of the high-stage cylinder into the high-stage working chamber, abutting on the high-stage piston, and dividing the high-stage working chamber into a high-stage suction chamber and a high-stage compression chamber; 
   an airtight compressor housing accommodating therein the low-stage compressing section and the high-stage compressing section;   a low-stage suction hole provided in the low-stage cylinder and communicating the low-stage suction chamber with a low-pressure side of a refrigerating cycle;   a low-stage discharge hole provided in the low-stage end plate and communicating the low-stage compression chamber with a high-stage suction hole provided in the high-stage cylinder; and   a high-stage discharge hole provided in the high-stage end plate and communicating the high-stage compression chamber with a high-pressure side of the refrigerating cycle,   wherein a low-stage auxiliary discharge hole different from the low-stage discharge hole is provided in the low-stage end plate.   
   
   
       6 . The rotary compressor according to  claim 5 , wherein
 discharge valves are provided in the low-stage discharge hole and the low-stage auxiliary discharge hole, respectively, and   concave portions accommodating therein the discharge valves are separately provided in the low-stage end plate, respectively.   
   
   
       7 . The rotary compressor according to  claim 5 , wherein
 integrated L-shaped discharge valves are provided in the low-stage discharge hole and the low-stage auxiliary discharge hole, respectively, and   a concave portion accommodating therein the integrated L-shaped discharge valves and having a fixed portion common to the L-shaped discharge valves is provided in the low-stage end plate.   
   
   
       8 . The rotary compressor according to  claim 5 ,
 wherein a discharge groove communicating with the low-stage discharge hole is provided in a region of the low-stage cylinder inner wall corresponding to a position of the low-stage discharge hole provided in the one end plate, and no discharge groove is provided in a region of the low-stage cylinder inner wall corresponding to a position of the low-stage auxiliary discharge hole provided in the low-stage end plate.