Hermetic compressor

Abstract

A hermetic compressor includes: a hermetic case; a frame configured to be received in the hermetic case, a drive unit and a compression unit arranged at lower and upper sides of the frame, respectively; a rotating shaft mounted to the frame and configured to transmit a rotational force of the drive unit to the compression unit and having an upper eccentric portion connected to the upper compression unit; and a connecting rod configured to be coupled to the eccentric portion. An oil bank may be formed at a surface of the eccentric portion of the rotating shaft that comes into contact with the connecting rod.

1 . A hermetic compressor, comprising: 
 a hermetic case;    a frame configured to be received in the hermetic case,    a drive unit and a compression unit arranged at lower and upper sides of the frame, respectively;    a rotating shaft mounted to the frame and configured to transmit a rotational force of the drive unit to the compression unit and having an upper eccentric portion connected to the upper compression unit; and    a connecting rod configured to be coupled to the eccentric portion,    wherein an oil bank is formed at a surface of the eccentric portion of the rotating shaft that comes into contact with the connecting rod.    
   
   
       2 . The hermetic compressor according to  claim 1 , wherein the oil bank includes a circumferential groove formed at an outer circumferential surface of the eccentric portion.  
   
   
       3 . The hermetic compressor according to  claim 2 , wherein the eccentric portion of the rotating shaft includes: 
 a hollow channel having an open upper end configured to scatter oil therefrom; and    a connection path formed in a radial direction of the eccentric portion to communicate with the hollow channel so that oil is supplied to at least one contact portion between the eccentric portion and the connecting rod.    
   
   
       4 . The hermetic compressor according to  claim 3 , wherein the connection path is formed at the oil bank such that oil supplied into the connection path effectively remains in the oil bank.  
   
   
       5 . The hermetic compressor according to  claim 4 , wherein a linear groove is formed at an outer circumferential surface of the eccentric portion to extend from an upper end of the oil bank to the upper end of the eccentric portion, thereby serving as an oil path to allow oil discharged from the connection path to move upward along the eccentric portion.  
   
   
       6 . The hermetic compressor according to  claim 5 , wherein a linear groove is formed at the outer circumferential surface of the eccentric portion to extend from a lower end of the oil bank to a lower end of the eccentric portion, thereby serving as an oil path to allow the oil discharged from the connection path to move downward along the eccentric portion.  
   
   
       7 . The hermetic compressor according to  claim 4 , wherein; 
 an upper inclined groove is formed above the oil bank to extend in a direction opposite to a rotating direction of the rotating shaft, and    a lower inclined groove is formed beneath the oil bank to extend in the rotating direction of the rotating shaft.    
   
   
       8 . The hermetic compressor according to  claim 2 , wherein the eccentric portion includes: 
 a hollow channel having an open upper end to allow oil to be scattered therefrom; and    an inclined groove formed at an outer circumferential surface of the eccentric portion to extend from the upper end of the eccentric portion to an upper end of the oil bank in a rotating direction of the rotating shaft, thereby allowing the oil scattered from the upper end of the hollow channel to move downward to a location of the eccentric portion where a maximum centrifugal force is applied when a piston reaches a top dead point in a cylinder.    
   
   
       9 . The hermetic compressor according to  claim 8 , wherein the eccentric portion further includes: 
 an inclined groove formed at the outer circumferential surface of the eccentric portion to extend from a lower end of the oil bank to a lower end of the eccentric portion in the same direction as the rotating direction of the rotating shaft, thereby allowing the oil remaining in the oil bank to move downward to the location of the eccentric portion where the maximum centrifugal force is applied when the piston reaches the top dead point in the cylinder.    
   
   
       10 . The hermetic compressor according to  claim 8 , wherein the eccentric portion further includes: 
 an inclined groove formed at the outer circumferential surface of the eccentric portion to extend from a lower end of the oil bank to a lower end of the eccentric portion in the rotating direction of the rotating shaft, thereby enabling the oil remaining in the oil bank to move downward to a region which is spaced apart from the location of the eccentric portion where the maximum centrifugal force is applied when the piston reaches a top dead point in the cylinder.    
   
   
       11 . The hermetic compressor according to any one of  claims 8  to  10 , wherein a connection path is formed in a radial direction of the eccentric portion to communicate with both the hollow channel and the oil bank, so that the oil is supplied to at least one contact region between the eccentric portion and the connecting rod.  
   
   
       12 . The hermetic compressor according to  claim 11 , wherein the eccentric portion further includes a second oil bank, which includes a circumferential groove formed at the outer circumferential surface of the eccentric portion above the oil bank.  
   
   
       13 . The hermetic compressor according to  claim 12 , wherein the eccentric portion further includes a second connection path formed in a radial direction of the eccentric portion to communicate with both the hollow channel and the second oil bank, so that the oil flowing in the hollow channel is introduced into the second oil bank.  
   
   
       14 . The hermetic compressor according to any one of  claims 5  to  8 , wherein the eccentric portion further includes a second oil bank including a circumferential groove formed at the outer circumferential surface of the eccentric portion above the oil bank.  
   
   
       15 . The hermetic compressor according to  claim 14 , wherein the eccentric portion further includes a second connection path formed in a radial direction of the eccentric portion to communicate with both the hollow channel and the second oil bank, so that the oil flowing in the hollow channel is introduced into the second oil bank.  
   
   
       16 . A hermetic compressor, comprising: 
 a case;    a drive unit adapted to be received in the case;    a compression unit adapted to be received in the case;    a rotating shaft configured to transmit a rotational force of the drive unit to the compression unit, the rotating shaft including at least one eccentric portion;    a connecting rod adapted to be coupled to the at least one eccentric portion; and    an oil bank positioned at a surface of the at least one eccentric portion.    
   
   
       17 . The hermetic compressor according to  claim 16 , wherein the oil bank is positioned at a surface of the at least one eccentric portion that contacts the connecting rod.  
   
   
       18 . The hermetic compressor according to  claim 16 , further comprising a connection path formed at the at least one eccentric portion to supply oil to at least one contact portion between the at least one eccentric portion and the connecting rod.