Hermetic compressor

Abstract

A hermetic compressor provided with an improved oil feed structure to efficiently feed lubricating oil to a plurality of drive parts. The hermetic compressor includes a hermetic casing, a frame provided in the hermetic casing, a drive unit provided in a lower portion of the frame, a compression unit provided on an upper portion of the frame, a rotating shaft vertically installed in the frame to transmit a rotating force of the drive unit to the compression unit, with an eccentric part provided on an upper end of the rotating shaft and coupled to the compression unit, and an oil feed unit provided on the rotating shaft to feed oil from a bottom of the hermetic casing to the plurality of drive parts. The oil feed unit includes a first oil pickup unit provided on a lower end of the rotating shaft to lift the oil upward from the bottom of the hermetic casing, a first oil feed path provided in the rotating shaft above the first oil pickup unit while being eccentric from a central axis of the rotating shaft, a spiral oil feed groove provided around the rotating shaft above the first oil feed path and communicating with the first oil feed path, a second oil feed path provided in the eccentric part and communicating with the spiral oil feed groove, and a second oil pickup unit provided in the first oil feed path to increase an oil lift force.

1 . A hermetic compressor, comprising: 
 a hermetic casing;    a frame provided in the hermetic casing;    a drive unit provided in a lower portion of the frame;    a compression unit provided on an upper portion of the frame;    a rotating shaft vertically installed in the frame to transmit a rotating force of the drive unit to the compression unit, with an eccentric part provided on an upper end of the rotating shaft and coupled to the compression unit; and    an oil feed unit provided on the rotating shaft to feed oil from a bottom of the hermetic casing to a plurality of drive parts, the oil feed unit comprising: 
 a first oil pickup unit provided on a lower end of the rotating shaft to lift the oil upward from the bottom of the hermetic casing;  
 a first oil feed path provided in the rotating shaft above the first oil pickup unit while being eccentric from a central axis of the rotating shaft;  
 a spiral oil feed groove provided around an outer surface of the rotating shaft above the first oil feed path and communicating with the first oil feed path;  
 a second oil feed path provided in the eccentric part of the rotating shaft and communicating with the spiral oil feed groove; and  
 a second oil pickup unit provided in the first oil feed path to increase an oil lift force.  
   
   
   
       2 . The hermetic compressor according to  claim 1 , wherein the first oil feed path is inclinedly provided in the rotating shaft so that a central axis of the first oil feed path is diverged from the central axis of the rotating shaft in a direction from the lower end to the upper end of the rotating shaft.  
   
   
       3 . The hermetic compressor according to  claim 1 , wherein the second oil feed path is inclinedly provided in the eccentric part of the rotating shaft so that a central axis of the second oil feed path is diverged from the central axis of the rotating shaft in a direction from a lower end to an upper end of the eccentric part.  
   
   
       4 . The hermetic compressor according to  claim 1 , further comprising: 
 a bearing provided between the upper portion of the frame and a lower end of the eccentric part of the rotating shaft, wherein the second oil feed path extends from the eccentric part of the rotating shaft to a predetermined position of an interior of the rotating shaft under the bearing and communicates with the spiral oil feed groove via a communication hole which is provided on the rotating shaft in a radial direction.    
   
   
       5 . The hermetic compressor according to  claim 4 , wherein the bearing comprises a thrust bearing to support an axial load.  
   
   
       6 . The hermetic compressor according to  claim 4 , further comprising: 
 an oil guide part provided on the outer surface of the rotating shaft so that the oil guide part extends from an upper end of the spiral oil feed groove to a position of the bearing, thus feeding the oil to the bearing.    
   
   
       7 . The hermetic compressor according to  claim 6 , wherein the oil guide part comprises a flat surface which is provided on the outer surface of the rotating shaft in an axial direction.  
   
   
       8 . The hermetic compressor according to  claim 1 , wherein the first oil pickup unit comprises: 
 an oil guide body having a cylindrical shape and provided with an oil inlet at a lower end of the oil guide body, the oil inlet of the oil guide body having an inner diameter which is smaller than an outer diameter of the oil guide body; and    a spiral blade provided in the oil guide body.    
   
   
       9 . The hermetic compressor according to  claim 1 , wherein the second oil pickup unit comprises a spiral blade provided in the first oil feed path.  
   
   
       10 . The hermetic compressor according to  claim 1 , further comprising: 
 an auxiliary oil feed path provided in the eccentric part of the rotating shaft in a radial direction to communicate with the second oil feed path.    
   
   
       11 . A hermetic compressor, comprising: 
 a hermetic casing;    a frame provided in the hermetic casing;    a drive unit provided in a lower portion of the frame;    a compression unit provided on an upper portion of the frame;    a rotating shaft vertically installed in the frame to transmit a rotating force of the drive unit to the compression unit, with an eccentric part provided on an upper end of the rotating shaft and coupled to the compression unit; and    an oil feed unit provided on the rotating shaft to feed oil from a bottom of the hermetic casing to a plurality of drive parts, the oil feed unit comprising: 
 a first oil pickup unit provided on a lower end of the rotating shaft to lift the oil upward from the bottom of the hermetic casing;  
 a first oil feed path provided in the rotating shaft above the first oil pickup unit while being eccentric from a central axis of the rotating shaft;  
 a spiral oil feed groove provided around an outer surface of the rotating shaft above the first oil feed path and communicating with the first oil feed path; and  
   a second oil feed path provided in the eccentric part of the rotating shaft and communicating with the spiral oil feed groove, the second oil feed path being inclined in the eccentric part so that a central axis of the second oil feed path is diverged from the central axis of the rotating shaft in a direction from a lower end to an upper end of the eccentric part.    
   
   
       12 . The hermetic compressor according to  claim 11 , further comprising: 
 a thrust bearing provided between the upper portion of the frame and the lower end of the eccentric part of the rotating shaft, wherein the second oil feed path extends from the eccentric part of the rotating shaft to a predetermined position of an interior of the rotating shaft under the thrust bearing and communicates with the spiral oil feed groove via a communication hole which is provided on the rotating shaft in a radial direction.    
   
   
       13 . The hermetic compressor according to  claim 12 , further comprising: 
 an oil guide part provided on the outer surface of the rotating shaft so that the oil guide part extends from an upper end of the spiral oil feed groove to a position of the thrust bearing, thus feeding the oil to the thrust bearing, the oil guide part having a flat surface which is provided on the outer surface of the rotating shaft in an axial direction.