Sealed compressor and refrigerator including sealed compressor

Abstract

A sealed compressor ( 100 ) of the present invention comprises an electric component ( 111 ), a compression component ( 117 ), and a sealed container ( 101 ), the compression component includes a shaft ( 119 ), a cylinder block ( 129 ), a piston ( 133 ), and a crank weight ( 126 ), a rotor ( 115 ) of the electric component has a cylindrical shape, contains a cylindrical space therein, and includes an upper section ( 116 ) in which a lower portion of a bearing ( 131 ) of a cylinder block is fitted into the cylindrical space, a lower section ( 115 e ) to which a lower portion of the main shaft inserted into the through-hole of the bearing and inserted into the cylindrical space is fixedly fitted, and a balance weight ( 170, 270 ) placed on an opposite side of the crank weight with respect to the piston.

1 . A sealed compressor comprising:
 an electric component including a stator and a rotor which is rotatable with respect to the stator;   a compression component activated by the electric component placed below the compression component; and   a sealed container accommodating the electric component and the compression component;   wherein the compression component includes:   a shaft including a main shaft, and an eccentric shaft which is eccentric with respect to the main shaft;   a cylinder block including a bearing having inside thereof a through-hole extending vertically and supporting the main shaft inserted into the through-hole such that the main shaft is rotatable, and a cylinder having a compression chamber inside thereof;   a piston which is coupled to the eccentric shaft and is reciprocatable within the compression chamber; and   a crank weight mounted to an upper portion of the eccentric shaft;   wherein the rotor has a cylindrical shape and contains a cylindrical space therein; and   wherein the rotor includes:   an upper section in which a lower portion of the bearing is fitted into the cylindrical space;   a lower section which is smaller in inner diameter than the upper section, a lower portion of the main shaft inserted into the through-hole of the bearing and inserted into the cylindrical space being fixedly fitted to the lower section; and   a balance weight placed on an opposite side of the crank weight with respect to the piston.   
     
     
         2 . The sealed compressor according to  claim 1 ,
 wherein a height of the upper section is equal to or greater than 70% of a height of the rotor.   
     
     
         3 . The sealed compressor according to  claim 1 ,
 wherein the compression component further includes a thrust ball bearing placed on a thrust surface of the bearing.   
     
     
         4 . The sealed compressor according to  claim 1 ,
 wherein a mass of the balance weight is equal to or less than ⅕ of a mass of the crank weight.   
     
     
         5 . The sealed compressor according to  claim 1 ,
 wherein the balance weight is placed on a lower surface of the rotor.   
     
     
         6 . The sealed compressor according to  claim 1 ,
 wherein the balance weight is placed on an upper surface of the rotor.   
     
     
         7 . The sealed compressor according to  claim 1 ,
 wherein the balance weight is mounted to the rotor by a caulking pin.   
     
     
         8 . A refrigerator comprising the sealed compressor as recited in  claim 1 .