Scroll compressor

Abstract

A scroll compressor includes a hermetic container in which a refrigeration machine oil is stored in a bottom area, a compression mechanism that compresses a refrigerant which is suctioned into the hermetic container, an electric motor which has a motor rotor and a motor stator and is configured to drive the compression mechanism which is connected thereto via a shaft, a sub-frame that is fixed to the hermetic container and supports the shaft in a rotatable manner from a lower side of the electric motor, a balance weight that is disposed on a lower end face of the motor rotor, and a fixed cup that is disposed on an upper end of the sub-frame and surrounds the balance weight.

1 . A scroll compressor comprising:
 a hermetic container in which a refrigeration machine oil is stored in a bottom area of the hermetic container;   a compression mechanism that compresses a refrigerant which is suctioned into the hermetic container;   an electric motor which has a motor rotor and a motor stator and is configured to drive the compression mechanism which is connected to the electric motor via a shaft;   a sub-frame that is fixed to the hermetic container and supports the shaft in a rotatable manner from a lower side of the electric motor;   a balance weight that is disposed on a lower end face of the motor rotor; and   a fixed cup that is disposed on an upper end of the sub-frame and surrounds the balance weight.   
     
     
         2 . The scroll compressor of  claim 1 , wherein the fixed cup separates an inside space which contains the balance weight therein and an outside space which does not contain the balance weight therein in a space between the upper end of the sub-frame and the balance weight. 
     
     
         3 . The scroll compressor of  claim 1 , wherein the refrigerating machine oil is sealed with the liquid level thereof being above the lower end of the electric motor. 
     
     
         4 . The scroll compressor of  claim 2 , wherein the refrigerating machine oil is sealed with the liquid level thereof being above the lower end of the electric motor. 
     
     
         5 . The scroll compressor of  claim 1 , wherein the fixed cup is formed by connecting a seat member for fixing to the sub-frame and a cup member that surrounds the balance weight. 
     
     
         6 . The scroll compressor of  claim 2 , wherein the fixed cup is formed by connecting a seat member for fixing to the sub-frame and a cup member that surrounds the balance weight. 
     
     
         7 . The scroll compressor of  claim 3 , wherein the fixed cup is formed by connecting a seat member for fixing to the sub-frame and a cup member that surrounds the balance weight. 
     
     
         8 . The scroll compressor of  claim 4 , wherein the fixed cup is formed by connecting a seat member for fixing to the sub-frame and a cup member that surrounds the balance weight. 
     
     
         9 . The scroll compressor of  claim 5 , wherein the seat member for fixing to the sub-frame and the cup member that surrounds the balance weight are connected by welding. 
     
     
         10 . The scroll compressor of  claim 6 , wherein the seat member for fixing to the sub-frame and the cup member that surrounds the balance weight are connected by welding. 
     
     
         11 . The scroll compressor of  claim 7 , wherein the seat member for fixing to the sub-frame and the cup member that surrounds the balance weight are connected by welding. 
     
     
         12 . The scroll compressor of  claim 8 , wherein the seat member for fixing to the sub-frame and the cup member that surrounds the balance weight are connected by welding. 
     
     
         13 . The scroll compressor of  claim 1 , wherein a penetrating flow passage is formed in the motor rotor in an axis direction, and a vertical cross-sectional area of a gap space between an upper end of the fixed cup and a lower end of the motor rotor is larger than the vertical cross-sectional area of the penetrating flow passage.