Variable-Capacity Compressor

Abstract

To prevent operation failure caused by adhesion of a lubricating oil of a control valve for controlling a discharge displacement. A partition member 150 is provided to partition a suction chamber 141 into: a first space 141 a, to which a suction passage is connected, and in which a lubricating oil is separated from a refrigerant gas and is stored; and a second space 141 b, to which a suction hole 103 a is connected, and to which the refrigerant gas from which the lubricating oil that has been separated is introduced via a communication hole 150 a, and it is configured so that a pressure in the second space 141 b can be introduced to a control valve 300 via a pressure introducing passage 147.

1 . A variable-displacement compressor comprising:
 a piston that compresses a refrigerant gas drawn from a suction chamber via a suction hole and discharges the refrigerant gas to a discharge chamber via a discharge hole;   a first passage that communicates between a crank chamber on a back side of the piston and the discharge chamber;   a control valve provided in the first passage and that controls an opening of the first passage;   a second passage that communicates between the crank chamber and the suction chamber, and that is provided with an orifice; and   a pressure introducing passage configured to introduce a pressure in the suction chamber to the control valve,   wherein the control valve controls an opening of the first passage depending on the pressure in the suction chamber, which has been introduced from the pressure introducing passage, so as to control a pressure in the crank chamber, so that a stroke of the piston is changed, and accordingly, a discharge displacement of a refrigerant gas is varied,   wherein the suction chamber includes a storage area for separating a lubricating oil from a refrigerant gas inflowing from a suction passage and for storing the lubricating oil, and an inflow area into which the refrigerant gas, from which the lubricating oil has been separated, flows,   wherein the second passage is open to the inflow area, and   wherein the pressure introducing passage is open to an inflow area into which the refrigerant gas, from which the lubricating oil has been separated, flows, so as to introduce the pressure in the suction chamber to the control valve.   
     
     
         2 . The variable-displacement compressor according to  claim 1 , wherein the suction chamber is partitioned, by a partition member, into a first space to which the suction passage is open, and that acts as the storage area, and a second space to which the suction hole and the pressure introducing passage are open, and that acts as the inflow area, wherein a communication passage that communicates between the first space and the second space is provided. 
     
     
         3 . The variable-displacement compressor according to  claim 2 , wherein the communication passage is formed in the partition member by adjusting a position thereof, so as to be capable of storing a predetermined amount of the lubricating oil in the first space. 
     
     
         4 . The variable-displacement compressor according to  claim 2 , wherein the partition member is formed by protruding, into a suction chamber, a portion of a head gasket facing a suction chamber, the head gasket being interposed between a valve plate, in which the suction hole and the discharge hole are formed, and a cylinder head, in which the suction chamber and the discharge chamber are formed. 
     
     
         5 . The variable-displacement compressor according to  claim 4 , wherein, on a surface of a suction chamber forming wall of the cylinder head facing the valve plate, a protruded portion for pressing a periphery of the partition member of the head gasket onto the valve plate, is formed to protrude.