Hermetic compressor

Abstract

A hermetic compressor includes a hermetic container, a compression element accommodated in the hermetic container, and a motor element driving the compression element. The hermetic container has an inner space therein arranged to store lubrication oil. The compression element includes a shaft unit rotating about a rotation axis. The shaft unit has an oil-feeding passage provided therein. The oil-feeding passage extends upward from a lower end of the shaft unit. The shaft unit has an oil-spattering hole provided therein. The oil-spattering hole extends substantially perpendicularly to the rotation axis. The oil-spattering hole has a first open end communicating with the oil-feeding passage and a second open end opening in the inner space of the hermetic container. The second open end has a cross-sectional area smaller than a cross-sectional area of the first open end. This hermetic compressor supplies lubrication oil to sliding component, such as a piston, of the compression element, thus operating reliably and efficiently.

1 . A hermetic compressor comprising:
 a hermetic container having an inner space therein, the inner space being arranged to store lubrication oil therein;   a compression element accommodated in the hermetic container, the compression element including
 a shaft unit rotating about a rotation axis, the shaft unit including a main shaft and an eccentric shaft, and 
 a bearing supporting the main shaft of the shaft unit; and 
   a motor element accommodated in the hermetic container, the motor element driving the compression element, wherein   the shaft unit has an oil-feeding passage provided therein, the oil-feeding passage extending upward from a lower end of the shaft unit,   the shaft unit has an oil-spattering hole provided therein, the oil-spattering hole extending substantially perpendicularly to the rotation axis,   the oil-spattering hole has a first open end communicating with the oil-feeding passage and a second open end opening in the inner space of the hermetic container, and   the second open end has a cross-sectional area smaller than a cross-sectional area of the first open end.   
     
     
         2 . The hermetic compressor of  claim 1 , wherein the oil-spattering hole has
 a first portion connected to the first open end and   a second portion connected to the second open end, the second portion having a cross-sectional area smaller than a cross-sectional area of the first portion.   
     
     
         3 . The hermetic compressor of  claim 2 , wherein the second portion of the oil-spattering hole is connected to the first portion of the oil-spattering hole. 
     
     
         4 . The hermetic compressor of  claim 2 , wherein the first portion and the second portion of the oil-spattering hole comprise holes having inner diameters different from each other, respectively. 
     
     
         5 . The hermetic compressor of  claim 2 , wherein the shaft unit includes
 a first member having the first portion of the oil-spattering hole provided therein, and   a second member having the second portion of the oil-spattering hole provided therein, the second member being assembled to the first member.   
     
     
         6 . The hermetic compressor of  claim 5 , wherein the shaft unit further includes
 a shaft having the first portion of the oil-spattering hole provided therein, and   a balancing weight having the second portion of the oil-spattering hole provided therein, the balancing weight being fixed to the shaft.   
     
     
         7 . The hermetic compressor of  claim 2 , wherein the second portion of the oil-spattering hole has a length not smaller than twice an inner diameter of the second open end. 
     
     
         8 . The hermetic compressor of  claim 2 , wherein the first open end of the oil-spattering hole has an inner diameter not smaller than 1.5 times an inner diameter of the second open end of the oil-spattering hole. 
     
     
         9 . The hermetic compressor of  claim 1 , wherein the compression element further includes
 a cylinder block having a compression chamber therein,   a piston moving reciprocally in the compression chamber, and   a connecting member for coupling the piston to the eccentric shaft of the shaft unit.