Compressor

Abstract

A compressor is provided that may include a shell in which a discharge outlet may be provided; a cylinder provided inside of the shell and configured to form a compression space of a refrigerant; a piston provided inside of the cylinder and capable of reciprocating in an axial direction; and a discharge valve provided at one side of the cylinder and configured to selectively discharge a refrigerant compressed in the compression space of the refrigerant. The discharge valve may be formed with a magnesium (Mg) alloy in which the Mg has a weight ratio (wt %) of about 90 or higher, thus having a tensile strength of about 250 MPa or higher at about 150° C.

What is claimed is: 
     
         1 . A compressor, comprising:
 a shell in which a discharge outlet is provided;   a cylinder provided inside of the shell and configured to form a compression space of a refrigerant;   a piston provided inside of the cylinder and capable of reciprocating in an axial direction; and   a discharge valve provided at one side of the cylinder and configured to selectively discharge a refrigerant compressed in the compression space of the refrigerant, wherein the discharge valve is formed with a magnesium (Mg) alloy in which the Mg has a weight ratio (wt %) of about 90 or higher, thus having a tensile strength of about 250 MPa or higher at about 150° C.   
     
     
         2 . The compressor of  claim 1 , wherein the discharge valve includes:
 a valve main body configured to selectively open the compression space in the cylinder; and   a coating provided at an outer surface of the valve main body to prevent wear of the discharge valve.   
     
     
         3 . The compressor of  claim 2 , wherein the valve main body includes a rear surface provided adjacent to the cylinder, and wherein the coating is provided at the rear surface. 
     
     
         4 . The compressor of  claim 2 , wherein the coating includes at least one of polytetrafluoroethylene (PTFE), diamond-like carbon (DLC), or ceramic. 
     
     
         5 . The compressor of  claim 2 , wherein the coating includes PTFE and an additive to reinforce a strength thereof. 
     
     
         6 . The compressor of  claim 5 , wherein the additive includes at least one of nano-diamond or a carbon nanotube. 
     
     
         7 . The compressor of  claim 1 , further including:
 a valve spring configured to support the discharge valve to provide a restorative force;   a spring coupler provided at the discharge valve and to which the valve spring is coupled; and   a sheet installed at the spring coupler in order to prevent wear of the discharge valve.   
     
     
         8 . The compressor of  claim 7 , wherein the spring coupler includes at least one step provided on the discharge valve. 
     
     
         9 . The compressor of  claim 7 , wherein the sheet includes a Teflon sheet. 
     
     
         10 . The compressor of  claim 7 , wherein the valve spring includes:
 a spring main body including a coil spring; and   a surface-treated portion formed at the spring main body by polishing.   
     
     
         11 . The compressor of  claim 1 , including:
 a valve spring configured to support the discharge valve to provide a restorative force;   a spring coupler provided at the discharge valve and to which the valve spring is coupled; and   an end portion provided at the valve spring and configured to extend by being bent in a direction of being spaced apart from the spring coupler.   
     
     
         12 . The compressor of  claim 1 , further including a valve spring configured to support the discharge valve to provide a restorative force, wherein the valve spring includes a conical coil spring, a cylindrical coil spring, or a plate spring. 
     
     
         13 . The compressor of  claim 1 , wherein the Mg alloy further includes a metal to reinforce a strength of the discharge valve, and the metal includes at least one of yttrium (Y) or neodymium (Nd). 
     
     
         14 . The compressor of  claim 13 , wherein the Mg alloy includes:
 Yttrium(Y) having about 3.7 to 4.3 wt %; and   Neodymium(Nd) having about 2.4 to 4.4 wt %.   
     
     
         15 . A compressor, comprising:
 a shell in which a discharge outlet is provided;   a cylinder provided inside of the shell and configured to form a compression space of a refrigerant;   a frame configured to fix the cylinder to the shell;   a piston provided inside of the cylinder and capable of reciprocating in an axial direction;   a discharge valve configured to selectively open the compression space of the refrigerant and formed of a magnesium (Mg) alloy containing Mg, Yttrium(Y), and Neodymium(Nd) each having a predetermined weight ratio; and   a valve spring configured to support the discharge valve to provide a restorative force, wherein the discharge valve includes:
 a spring coupler to which the valve spring is coupled; 
 a sheet installed at the spring coupler to reinforce a strength of the discharge valve; and 
 a coating provided at an outer surface of the discharge valve and formed of at least one of polytetrafluoroethylene (PTFE), nano-diamond, or a carbon nanotube. 
   
     
     
         16 . The compressor of  claim 15 , wherein the Mg alloy includes:
 Mg having about 90 to 93 wt %;   Y having about 3.7 to 4.3 wt %; and   Nd having about 2.4 to 4.4 wt %.   
     
     
         17 . The compressor of  claim 15 , wherein a surface hardness of the coating is about 600 to 700 Hv based on a pencil hardness of about 3H. 
     
     
         18 . The compressor of  claim 15 , wherein the coating is provided at the discharge valve by being sprayed thereon. 
     
     
         19 . The compressor of  claim 15 , wherein the valve spring includes a conical coil spring, a cylindrical coil spring, or a plate spring. 
     
     
         20 . A compressor, comprising:
 a shell in which a discharge outlet is provided;   a cylinder provided inside of the shell and configured to form a compression space of a refrigerant;   a piston provided inside of the cylinder and capable of reciprocating in an axial direction;   a discharge valve provided at one side of the cylinder and configured to selectively discharge a refrigerant compressed in the compression space of the refrigerant, wherein the discharge valve is formed with a magnesium (Mg) alloy in which the Mg has a weight ratio (wt %) of about 90 or higher, and wherein the Mg alloy further includes a metal to reinforce a strength of the discharge valve, the metal including Yttrium(Y) having about 3.7 to 4.3 wt %; and Neodymium(Nd) having about 2.4 to 4.4 wt %.