Compressor

Abstract

An oil circulation ratio OCR of a compressor is reduced with a simple structure. A cylinder head 104 has a suction chamber 141 formed on the inside thereof in a radial direction and a discharge chamber 142 formed on the outside thereof in the radial direction, the suction and discharge chambers being separated by a first annular partition wall 104 d . An oil storage chamber 148 is formed at a central portion of the cylinder head 104 by being separated from the suction chamber 141 by a second annular partition wall 104 e . A pressure release passage 146 ( 101 c →101 d →103 c →148→104 e 1 ) allows a crank chamber 140 and the suction chamber 141 to communicate with each other. The oil storage chamber 148 forms a portion of the pressure release passage 146 , separates oil from a refrigerant flowing through the pressure release passage 146 , and stores the oil.

1 . A compressor that includes a cylinder block that has a plurality of cylinder bores and has a piston mounted on each of the cylinder bores, and a cylinder head that is disposed on one end side of the cylinder block via a valve plate and defines a suction chamber on the inside thereof in a radial direction and a discharge chamber on the outside thereof in the radial direction, and in which the piston is reciprocated by a swash plate that rotates in synchronization with a driving shaft to draw a refrigerant into the cylinder bore from the suction chamber and compress the refrigerant within the cylinder bore to discharge the refrigerant to the discharge chamber, the compressor comprising:
 a pressure release passage that allows a crank chamber, in which the swash plate is disposed, and the suction chamber to communicate with each other; and   an oil storage chamber that forms a portion of the pressure release passage and separates oil from the refrigerant flowing through the pressure release passage to store the oil,   wherein the oil storage chamber is defined by an annular partition wall and the valve plate, wherein the annular partition wall is formed integrally with the cylinder head, is provided to protrude toward the valve plate from a bottom wall of the cylinder head, and has an outer peripheral portion surrounded by the suction chamber.   
     
     
         2 . The compressor according to  claim 1 ,
 wherein a protruding height of the annular partition wall is set such that a protruding-side end portion of the annular partition wall presses the valve plate when the cylinder block and the cylinder head are fastened to each other.   
     
     
         3 . The compressor according to  claim 2 ,
 wherein a lower region of the oil storage chamber in a gravitational direction communicates with the suction chamber via an oil return passage with a throttle straddling the annular partition wall, and   wherein the oil return passage is formed in at least one of the valve plate and an interposed member interposed between the valve plate and the cylinder head.   
     
     
         4 . The compressor according to  claim 1 ,
 wherein a suction passage that allows an external refrigerant circuit and the suction chamber to communicate with each other is formed in the cylinder head, and   wherein the suction passage has a straight path that linearly extends from the outside of the cylinder head in the radial direction toward the inside thereof in the radial direction, and a constituent wall of the straight path is bulged into the oil storage chamber.   
     
     
         5 . The compressor according to  claim 1 ,
 wherein a suction passage that allows an external refrigerant circuit and the suction chamber to communicate with each other is formed in the cylinder head,   wherein the suction passage has a straight path that linearly extends from the outside of the cylinder head in the radial direction toward the inside thereof in the radial direction, and   wherein a tubular space, which communicates with the straight path on one end side thereof and communicates with the suction chamber on the other end side thereof via a throttle, is formed on an extension of the straight path, and a constituent wall of the tubular space is bulged into the oil storage chamber.   
     
     
         6 . The compressor according to  claim 1 ,
 wherein the oil storage chamber becomes a pressure region of the suction chamber,   wherein a suction passage that allows an external refrigerant circuit and the suction chamber to communicate with each other is formed in the cylinder head,   wherein the suction passage has a straight path that linearly extends from the outside of the cylinder head in the radial direction toward the inside thereof in the radial direction,   wherein an upper region of the oil storage chamber in a gravitational direction communicates with a connecting path that extends from the straight path, and   wherein the connecting path has a smaller-diameter portion having a smaller diameter than the straight path.   
     
     
         7 . The compressor according to  claim 6 ,
 wherein the connecting path has the smaller-diameter portion, and a larger-diameter portion that is disposed closer to the straight path than the smaller-diameter portion and has a larger diameter than the smaller-diameter portion.   
     
     
         8 . The compressor according to  claim 6 ,
 wherein the suction passage has a first passage that directly reaches the suction chamber from the straight path, and a second passage that reaches the suction chamber via the connecting path and the upper region of the oil storage chamber in the gravitational direction from the straight path, and a minimum flow passage cross-sectional area of the second passage is set to be smaller than a minimum flow passage cross-sectional area of the first passage.   
     
     
         9 . The compressor according to  claim 1 ,
 wherein the oil storage chamber becomes a pressure region of the suction chamber,   wherein a suction passage that allows an external refrigerant circuit and the suction chamber to communicate with each other is formed in the cylinder head,   wherein the suction passage has a straight path that linearly extends from the outside of the cylinder head in the radial direction toward the inside thereof in the radial direction,   wherein an upper region of the oil storage chamber in a gravitational direction communicates with a connecting path that extends from the straight path, and   wherein the connecting path forms a portion of the pressure release passage.   
     
     
         10 . The compressor according to  claim 1 , further comprising:
 a pressure supply passage that allows the discharge chamber and the crank chamber to communicate with each other;   a control valve disposed in the pressure supply passage; and   a throttle disposed upstream of the oil storage chamber of the pressure release passage,   wherein the swash plate is configured such that an inclination angle thereof is changeable, and when the pressure of the crank chamber increases, the inclination angle decreases and thereby the stroke of the piston decreases.