Compressor

Abstract

A rotary valve ( 71 ) of a compressor is formed with a release path ( 71 e ) configured to release a high pressure residual refrigerant which have not been discharged in a compression and discharge stroke from one cylinder bores (B 1 ) which is in an initial stage of its suction stroke to other cylinder bores (B 3 , B 4 ) having a lower pressure than the one cylinder bores (B 1 ). The release path ( 71 e ) is formed with an inlet ( 71 f ), a first outlet ( 71 g ), a second outlet ( 71 h ), and a communication part ( 71 k ) connecting the inlet and the outlets. During a time period when the inlet ( 71 f ) of the release path ( 71 e ) is connected to the cylinder bore (B 1 ) which is in a initial state of its suction stroke, the first outlet ( 71 g ) is connected to the cylinder bore (B 3 ) next to, in an opposite direction to the rotational direction, the cylinder bore (B 4 ) which is 180 degree opposite to the cylinder bore (B 1 ), and then, the second outlet ( 71 h ) is connected to the cylinder bore (B 4 ) which is 180 degree opposite to the cylinder bore (B 1 ).

1 . A compressor ( 1 ) comprising:
 an even number of at least four of cylinder bores (Bj) evenly spaced from each other in a circumferential direction thereof around a drive shaft ( 10 );   a suction chamber ( 7 ) separated from the cylinder bores (Bj) by a first partition wall ( 9 ,  85 ) provided with suction holes ( 11   j ) and configured to communicate with the cylinder bores (Bj) through the suction holes;   a discharge chamber ( 8 ) separated from the cylinder bores (Bj) by a second partition wall ( 9 ) provided with discharge holes ( 12   j ) and configured to communicate with the cylinder bores (Bj) through the discharge holes;   a piston (Pj) provided in each of the cylinder bores (Bj) and configured to reciprocate in the cylinder bores (Bj) in response to rotation of the drive shaft ( 10 ) so as to perform a suction stroke and a compression and discharge stroke alternately; and   a rotary valve ( 71 ) configured to be in rotary slidable contact with the first partition wall while covering the suction holes ( 11   j ) and to rotate in synchronizing with the rotation of the drive shaft ( 10 ),   the rotary valve ( 71 ) includes:   a suction path ( 71   c ) configured to open the suction holes ( 11   j ) of the cylinder bores (Bj) subjected to the suction strokes so as to connect the cylinder bores (Bj) to the suction chamber ( 7 ); and   a release path ( 71   e ) configured to release a high pressure residual refrigerant which could not be discharged in the compression and discharge stroke from one of the cylinder bores (Bj) subjected to an initial stage of the suction stroke to others of the cylinder bores (Bj) having a lower pressure than the one of the cylinder bores (Bj), the release path ( 71   e ) including: an inlet ( 71   f ), a first outlet ( 71   g ) and a second outlet ( 71   h ) which are provided on a rotational trajectory to overlap with the suction holes ( 11   j ); and a communication part ( 71   k ) provided outside of the rotational trajectory and connecting the inlet and the outlets;   wherein, a time period when the inlet ( 71   f ) of the release path ( 71   e ) is connected to a first one of the cylinder bores (Bj) subjected to an initial state of the suction stroke include: an A-period when the first outlet ( 71   g ) is connected to a second one of the cylinder bores (Bj) next to, in a counter-rotational direction, a third one of the cylinder bores (Bj) which is located 180 degree opposite to the first one of the cylinder bores (Bj), and after the A-period, a C-period when the second outlet ( 71   h ) is connected to the third one of the cylinder bores (Bj) which is 180 degree opposite to the first one of the cylinder bores (Bj).   
   
   
       2 . The compressor according to  claim 1 , wherein
 the A-period and the C-period are partially overlapped so that the C-period follows the A-period without a break therebetween.