Piston type compressor

Abstract

A piston type compressor has a cylinder block, a cylinder bore formed in the cylinder block, a rotary shaft, a piston and a compression chamber formed in the cylinder bore. The piston is received in the cylinder bore and reciprocates in accordance with the rotation of the rotary shaft. The compressor further has a main suction chamber communicable with the compression chamber, a discharge chamber formed annularly so as to surround the main suction chamber, a subsidiary suction chamber formed so as to surround the discharge chamber, partitions formed in the discharge chamber so as to protrude into the discharge chamber and a suction passage formed in each partition so as to interconnect the subsidiary suction chamber and the main suction chamber.

1 . A piston type compressor comprising:
 a cylinder block;   a cylinder bore formed in the cylinder block;   a rotary shaft;   a piston, wherein the piston is received in the cylinder bore and reciprocates in accordance with the rotation of the rotary shaft;   a compression chamber formed in the cylinder bore;   a main suction chamber communicable with the compression chamber;   a discharge chamber formed annularly so as to surround the main suction chamber, the discharge chamber being communicable with the compression chamber;   a subsidiary suction chamber formed so as to surround the discharge chamber;   partitions formed in the discharge chamber so as to protrude into the discharge chamber; and   a suction passage formed in each partition so as to interconnect the subsidiary suction chamber and the main suction chamber.   
   
   
       2 . The piston type compressor according to  claim 1 , further comprising:
 a housing connected to the cylinder block,   
     wherein the discharge chamber, the subsidiary suction chamber and the main suction chamber are formed in the housing, and the partition is formed on inner wall of the housing. 
   
   
       3 . The piston type compressor according to  claim 1 , further comprising:
 a rotary valve formed in the rotary shaft with an axial passage for supplying refrigerant gas from the main suction chamber to the compression chamber; and   a communication passage formed in the cylinder block so as to interconnect the axial passage and the compression chamber.   
   
   
       4 . The piston type compressor according to  claim 1 ,
 wherein a pair of front and rear cylinder blocks cooperate to form the cylinder block and the cylinder bore is formed in each of the front and rear cylinder blocks,   wherein the piston is a double-headed piston, the double-headed piston being received in the front and rear cylinder bores, respectively,   wherein a pair of front and rear housings are connected to the pair of front and rear cylinder blocks, respectively, a plurality of partitions with suction passages being formed in the front and rear housings, respectively.   
   
   
       5 . The piston type compressor according to  claim 1 , further comprising:
 a plurality of small chambers divided in the discharge chamber by the partitions,   wherein the small chambers are connected each other thereby to form the single discharge chamber.   
   
   
       6 . The piston type compressor according to  claim 5 , further comprising:
 an outlet passage connecting with one of the plurality of small chambers in the discharge chamber.   
   
   
       7 . The piston type compressor according to  claim 5 , further comprising:
 wherein the cross-sectional area of the discharge chamber where the partition is formed between the adjacent small chambers is smaller than that of the other annular parts of the discharge chamber.   
   
   
       8 . The piston type compressor according to  claim 1 ,
 wherein each of the small chambers is provided in one-to-one relation to its corresponding cylinder bore.   
   
   
       9 . The piston type compressor according to  claim 1 , further comprising:
 a seal device interposed between the rotary shaft and the housing so as to prevent leakage of the refrigerant gas;   a seal chamber having therein the seal device; and   a lubrication passage formed in the housing so as to interconnect the main suction chamber and the seal chamber.   
   
   
       10 . The piston type compressor according to  claim 1 ,
 wherein the partitions are spaced apart from each other along the circumferential direction of the discharge chamber.   
   
   
       11 . The piston type compressor according to  claim 1 ,
 wherein the partition extends from the subsidiary suction chamber to the main suction chamber across the discharge chamber.