Linear compressor

Abstract

Disclosed herein is a linear compressor having a stator cover, which is designed in such a fashion that a section of the stator cover not to be fastened with bolts has a curvature smaller than the remaining section thereof to be fastened with the bolt so as to be reduced in size thereof. This enables the stator cover to be spaced apart from the shell by a sufficient distance, thereby achieving a size reduction of the shell and a small-scale linear compressor.

1 . A linear compressor comprising: 
 a shell;    a linear motor mounted in the shell;    a cylinder frame mounted in front of the linear motor;    a stator cover mounted in rear of the linear motor;    a piston rectilinearly reciprocably disposed in a cylinder mounted in the cylinder frame; and    fastening device for fixing the cylinder frame and the stator cover relative to each other,    wherein the stator cover is formed to have two or more curvatures.    
   
   
       2 . The compressor as set forth in  claim 1 , wherein the stator cover has a plurality of through-holes for the penetration of the fastening device.  
   
   
       3 . The compressor as set forth in  claim 2 , wherein the stator cover is configured so that a curvature of a section of the stator cover not formed with the through-holes is smaller than a curvature of the remaining section of the stator cover formed with the through-holes.  
   
   
       4 . The compressor as set forth in  claim 3 , wherein the fastening device includes: 
 bolts for axially penetrating through the cylinder frame and the stator cover; and    nuts to be fastened to the bolts, respectively.    
   
   
       5 . A linear compressor comprising: 
 a shell in which oil is received;    a linear motor mounted in the shell;    a cylinder frame mounted in front of the linear motor;    a stator cover mounted in rear of the linear motor;    a piston rectilinearly reciprocably disposed in a cylinder mounted in the cylinder frame; and    oil supply device supported at opposite ends thereof against the cylinder frame and the stator cover and adapted to supply the oil received in the shell into a gap between the piston and the cylinder,    wherein the stator cover is configured so that a lower section of the stator cover supporting the oil supply device has a curvature smaller than a curvature of an upper section of the stator cover.    
   
   
       6 . The compressor as set forth in  claim 5 , wherein the oil supply device includes an oil pump adapted to pump the oil received in the shell into a gap between the piston and the cylinder.  
   
   
       7 . The compressor as set forth in  claim 6 , wherein the oil supply device includes: 
 the oil pump mounted between the cylinder frame and the stator cover to pump the oil received in the shell;    an oil suction channel for introducing the oil from the oil pump into the gap between the cylinder and the piston; and    an oil discharge channel for discharging the oil between the cylinder and the piston to the outside of the cylinder.    
   
   
       8 . The compressor as set forth in  claim 7 , wherein the oil pump has: 
 oil cylinder having an oil inlet and an oil outlet formed at opposite ends thereof;    an oil piston rectilinearly reciprocably disposed in the oil cylinder; and    first and second oil springs disposed in the oil cylinder to elastically support opposite ends of the oil piston.    
   
   
       9 . The compressor as set forth in  claim 8 , wherein one end of the oil cylinder is supported against the cylinder frame, and the other end of the oil cylinder is supported against the stator cover.  
   
   
       10 . The compressor as set forth in  claim 9 , wherein the stator cover has an oil inlet formed at a lower region thereof to correspond to the oil inlet of the oil cylinder.  
   
   
       11 . A linear compressor comprising: 
 a shell in which oil is received;    a linear motor mounted in the shell;    a cylinder frame mounted in front of the linear motor;    a stator cover mounted in rear of the linear motor;    a piston rectilinearly reciprocably disposed in a cylinder mounted in the cylinder frame;    fastening device for fixing the cylinder frame and the stator cover relative to each other; and    oil supply device for supplying the oil received in the shell into a gap between the piston and the cylinder,    wherein the stator cover is formed to have two or more curvatures.    
   
   
       12 . The compressor as set forth in  claim 11 , wherein the stator cover has a plurality of through-holes for the penetration of the fastening device.  
   
   
       13 . The compressor as set forth in  claim 12 , wherein the stator cover is configured so that a curvature of a section of the stator cover not formed with the through-holes is smaller than a curvature of the remaining section of the stator cover formed with the through-holes.  
   
   
       14 . The compressor as set forth in  claim 13 , wherein the fastening device includes: 
 bolts for axially penetrating through the cylinder frame and the stator cover; and    nuts to be fastened to the bolts, respectively.    
   
   
       15 . The compressor as set forth in  claim 14 , wherein the oil supply device includes an oil pump adapted to pump the oil received in the shell into a gap between the piston and the cylinder.  
   
   
       16 . The compressor as set forth in  claim 14 , wherein the oil supply device includes: 
 the oil pump mounted between the cylinder frame and the stator cover to pump the oil received in the shell;    an oil suction channel for introducing the oil from the oil pump into the gap between the cylinder and the piston; and    an oil discharge channel for discharging the oil between the cylinder and the piston to the outside of the cylinder.    
   
   
       17 . The compressor as set forth in  claim 16 , wherein the oil pump has: 
 oil cylinder having an oil inlet and an oil outlet formed at opposite ends thereof;    an oil piston rectilinearly reciprocably disposed in the oil cylinder; and    first and second oil springs disposed in the oil cylinder to elastically support opposite ends of the oil piston.    
   
   
       18 . The compressor as set forth in  claim 17 , wherein one end of the oil cylinder is supported against the cylinder frame, and the other end of the oil cylinder is supported against the stator cover.  
   
   
       19 . The compressor as set forth in  claim 18 , wherein the stator cover is configured so that a lower section of the stator cover supporting the oil supply device has a curvature smaller than a curvature of an upper section of the stator cover.  
   
   
       20 . The compressor as set forth in  claim 19 , wherein the stator cover has an oil inlet formed at a lower region thereof to correspond to the oil inlet of the oil cylinder.