Refrigerant compressor, cooling system and refrigerator

Abstract

A refrigerant compressor having a compression element comprising sliding components made of metallic materials, wherein a mixed layer is formed by solid-dissolving molybdenum disulfide in at least one of the sliding faces of the sliding components, and a single molybdenum disulfide layer is further formed on the surface of the mixed layer. With this configuration, initial break-in is done using the single layer, and sliding loss is reduced. Even if the single layer peels off, because the molybdenum disulfide of the mixed layer is cleaved at a low friction coefficient, solid lubrication action is attained, the friction coefficient of the sliding section is lowered, and sliding loss is reduced.

1 . A refrigerant compressor wherein a compression element comprises sliding components made of metallic materials, and a mixed layer is formed by solid-dissolving molybdenum disulfide in at least one of the sliding faces of said sliding components, and a single molybdenum disulfide layer is further formed on the surface of said mixed layer. 
   
   
       2 . The refrigerant compressor according to  claim 1 , wherein the maximum concentration of the molybdenum disulfide in said mixed layer is 5 wt % or more. 
   
   
       3 . The refrigerant compressor according to  claim 1 , wherein the thickness of said mixed layer is 0.1 to 2.0 μm. 
   
   
       4 . The refrigerant compressor according to  claim 1 , wherein the purity of the molybdenum disulfide of said single molybdenum disulfide layer is 98% or more. 
   
   
       5 . The refrigerant compressor according to  claim 1 , wherein the thickness of said single molybdenum disulfide layer is 0.1 to 2.0 μm. 
   
   
       6 . The refrigerant compressor according to  claim 1 , wherein
 oil is accumulated and a compression element is accommodated in a closed container,   said compression element is a reciprocating compression element comprising a crankshaft equipped with a main shaft and an eccentric shaft; a thrust section, one end of which is integrated with said crankshaft and the other end of which is integrated with a bearing section; said bearing section rotatably journaling said main shaft; a cylinder block in which a cylindrical bore section is formed; a piston reciprocating inside said cylindrical bore section; a piston pin disposed in parallel with said eccentric shaft and secured to said piston; and a connecting rod for connecting said eccentric shaft to said piston, and   said sliding component made of a metallic material is at least either one of said crankshaft, said thrust section, said cylinder block, said piston, said piston pin, and said connecting rod.   
   
   
       7 . The refrigerant compressor according to  claim 1 , wherein
 oil is accumulated and a compression element is accommodated in a closed container,   said compression element comprises a crankshaft equipped with a main shaft and an eccentric shaft; a thrust section, one end of which is integrated with said crankshaft and the other end of which is integrated with a bearing section; said bearing section rotatably journaling said main shaft; a cylinder block in which a cylindrical bore section is formed; a piston reciprocating inside said cylindrical bore section; and a connecting rod to which a ball is secured on the side connected to said piston,   said piston in which said ball is movably held by crimping constitutes a reciprocating compression element, and   said sliding component made of a metallic material is at least either one of said crankshaft, said thrust section, said cylinder block, said piston, and said connecting rod.   
   
   
       8 . The refrigerant compressor according to  claim 1 , wherein
 oil is accumulated and a compression element is accommodated in a closed container,   said compression element is a rolling-piston-type compression element comprising a shaft having an eccentric section; a cylinder in which a compression chamber is formed in coaxial with the rotation center of said shaft; a rolling piston that is loosely fitted on said eccentric section and rolls inside said compression chamber; a vane that partitions said compression chamber into the high-pressure side and the low-pressure side thereof when made contact with said rolling piston under pressure; a main bearing and an auxiliary bearing that are used to seal both end faces of said cylinder and to journal said shaft on the side of an electric driving element and on the opposite side of said electric driving element, respectively; an oil supply spring secured to one end of said shaft; and an oil supply pipe that accommodates said oil supply spring and one end of which is open and immersed in said oil, and   said sliding component made of a metallic material is at least either one of said shaft, said cylinder, said rolling piston, said vane, said main bearing, said auxiliary bearing, said oil supply spring, and said oil supply pipe.   
   
   
       9 . A cooling system comprising said refrigerant compressor according to  claim 1 , and an expander equipped with either a capillary tube or an expansion valve. 
   
   
       10 . A refrigerator having a cooling system comprising said refrigerant compressor according to  claim 1 , and an expander equipped with either a capillary tube or an expansion valve.