Rotary compressor

Abstract

An object is to solve a problem that the smaller the number of rotations of a rotary compressor is, the more an efficiency decrease of the compressor is generated owing to an increase of a rotary vibration and an efficiency decrease of a motor. In the rotary compressor including, in a sealed vessel, a electromotive element and a rotary compression element driven by this electromotive element, on one of an upper end face of a rotor constituting the electromotive element (on a side opposite to a compression mechanism) and a lower end face of the rotor (on a compression mechanism side), a rotation inertia article capable of obtaining a rotation inertia moment is disposed. In consequence, it is possible to obtain the compressor having a high efficiency in which an increase of the rotary vibration of the compressor is suppressed even during an operation having the small number of the rotations of the compressor.

1 . A rotary compressor comprising: an electromotive element disposed in a sealed vessel and including a stator and a rotor; a rotary compression element driven by the electromotive element to compress and discharge a refrigerant; and a rotary shaft which connects the rotary compression element to the rotor of the electromotive element and which is rotatably supported by a bearing, 
 wherein on the bottom of the rotor of the electromotive element, a mass article is disposed which extends to a lower part of the stator and which obtains a rotation inertia moment.    
   
   
       2 . A rotary compressor comprising: an electromotive element disposed in a sealed vessel and including a stator and a rotor; a rotary compression element driven by the electromotive element to compress and discharge a refrigerant; and a rotary shaft which connects the rotary compression element to the rotor of the electromotive element and which is rotatably supported by a bearing, 
 wherein on the top of the rotor of the electromotive element, a mass article is disposed which extends to a lower part of the stator and which obtains a rotation inertia moment.    
   
   
       3 . The rotary compressor according to  claim 1 , wherein a motor forming the electromotive element is of a direct winding type, and the mass article disposed on the rotor is formed into a shape having an outer diameter which is equal to or smaller than an outer diameter of the rotor until a necessary insulation distance is reached from a stator coil, and after the insulation distance, the outer diameter of the shape is enlarged toward an inner wall of the sealed vessel into such a size as to cover the stator coil.  
   
   
       4 . The rotary compressor according to  claim 1 , wherein a discharge port to discharge a compressed gas from the rotary compression element into the sealed vessel is disposed in a position corresponding to ½ or less of the maximum outer diameter of the mass article disposed on the rotor.  
   
   
       5 . The rotary compressor according to  claim 2 , wherein a motor forming the electromotive element is of a direct winding type, and the mass article disposed on the rotor is formed into a shape having an outer diameter which is equal to or smaller than an outer diameter of the rotor until a necessary insulation distance is reached from a stator coil, and after the insulation distance, the outer diameter of the shape is enlarged toward an inner wall of the sealed vessel into such a size as to cover the stator coil.  
   
   
       6 . The rotary compressor according to  claim 2 , wherein a discharge port to discharge a compressed gas from the rotary compression element into the sealed vessel is disposed in a position corresponding to ½ or less of the maximum outer diameter of the mass article disposed on the rotor.  
   
   
       7 . The rotary compressor according to  claim 3 , wherein a discharge port to discharge a compressed gas from the rotary compression element into the sealed vessel is disposed in a position corresponding to ½ or less of the maximum outer diameter of the mass article disposed on the rotor.  
   
   
       8 . The rotary compressor according to  claim 5 , wherein a discharge port to discharge a compressed gas from the rotary compression element into the sealed vessel is disposed in a position corresponding to ½ or less of the maximum outer diameter of the mass article disposed on the rotor.