Scroll type compressor

Abstract

A scroll type compressor includes a motor including a rotor; a rotatable shaft coupled to the rotor; a frame disposed adjacent to the motor to support the rotatable shaft; a fixed scroll coupled to the frame; an orbiting scroll eccentrically coupled to the rotatable shaft, wherein the orbiting scroll is engaged with the fixed scroll to orbit relative to the fixed scroll; and a balance weight including: a coupling portion having an inner opening defined therein receiving the rotatable shaft, wherein the coupling portion is coupled to and between the rotor and the frame; and a weight portion extending from an outer periphery of the coupling portion.

What is claimed is: 
     
         1 . A scroll type compressor comprising:
 a casing that defines an inner space therein;   a motor disposed in the inner space of the casing and configured to generate a rotating force, the motor comprising a stator and a rotor;   a rotatable shaft coupled to the rotor of the motor;   a frame disposed at a side of the motor and configured to support the rotatable shaft;   a fixed scroll coupled to the frame, the fixed scroll and the frame defining a compressing chamber therebetween;   an orbiting scroll that is eccentrically coupled to the rotatable shaft, that is located in the compressing chamber, and that is engaged with the fixed scroll, the orbiting scroll being configured to orbit relative to the fixed scroll; and   a balance weight comprising:
 a coupling portion that defines an inner opening therein receiving the rotatable shaft, the coupling portion being coupled to the rotatable shaft at a position between the rotor and the frame, and 
 a weight portion that extends from an outer periphery of the coupling portion. 
   
     
     
         2 . The scroll type compressor of  claim 1 , wherein the rotatable shaft comprises a stopping shoulder that protrudes from an outer circumferential surface of the rotatable shaft, and
 wherein the balance weight is coupled to a position between the rotor and the stopping shoulder.   
     
     
         3 . The scroll type compressor of  claim 1 , wherein the weight portion has a uniform thickness. 
     
     
         4 . The scroll type compressor of  claim 1 , wherein the weight portion comprises at least one bent portion. 
     
     
         5 . The scroll type compressor of  claim 4 , wherein a shape of the at least one bent portion corresponds to an outer shape of the frame. 
     
     
         6 . The scroll type compressor of  claim 1 , wherein the coupling portion is configured to couple to the rotatable shaft based on sliding along the rotatable shaft to decrease a clearance defined between the coupling portion and the rotatable shaft. 
     
     
         7 . The scroll type compressor of  claim 6 , wherein the coupling portion is configured to be fixed to the rotatable shaft based on the rotor being press-fitted with the rotatable shaft. 
     
     
         8 . The scroll type compressor of  claim 1 , further comprising an anti-rotation mechanism configured to restrict rotation of the balance weight relative to the rotatable shaft. 
     
     
         9 . The scroll type compressor of  claim 8 , wherein the anti-rotation mechanism comprises:
 a groove defined in the rotor; and   a protrusion that protrudes from the coupling portion and that is configured to be inserted into the groove.   
     
     
         10 . The scroll type compressor of  claim 8 , wherein the anti-rotation mechanism comprises:
 a pin installed on the rotor; and   a pin hole defined in the coupling portion and configured to receive the pin.   
     
     
         11 . The scroll type compressor of  claim 8 , wherein the motor comprises a plurality of plates, and
 wherein the anti-rotation mechanism comprises:
 a rivet that fixes the plurality of plates to one another, and 
 a rivet hole defined at the balance weight and configured to receive a head of the rivet. 
   
     
     
         12 . The scroll type compressor of  claim 2 , wherein the coupling portion comprises an extended coupling part that extends along the rotatable shaft, and
 wherein a width of the extended coupling part corresponds to a spacing between the stopping shoulder and the rotor.   
     
     
         13 . A scroll type compressor comprising:
 a casing that defines an inner space therein;   a motor disposed in the inner space of the casing and configured to generate a rotating force, the motor comprising a stator and a rotor;   a rotatable shaft coupled to the rotor of the motor, the rotatable shaft comprising a stopping shoulder that protrudes from an outer circumferential surface of the rotatable shaft;   a frame disposed adjacent to the motor and configured to support the rotatable shaft;   a fixed scroll coupled to the frame, the fixed scroll and the frame defining a compressing chamber therebetween;   an orbiting scroll that is eccentrically coupled to the rotatable shaft, that is located in the compressing chamber, and that is engaged with the fixed scroll, the orbiting scroll being configured to orbit relative to the fixed scroll; and   a balance weight that is coupled to the rotatable shaft at a position between the rotor and the stopping shoulder and that is configured to counterbalance a centrifugal force generated by rotation of the orbiting scroll.   
     
     
         14 . The scroll type compressor of  claim 13 , wherein the balance weight comprises:
 a coupling portion that defines an inner opening therein receiving the rotatable shaft and that is coupled to the rotatable shaft at the position between the rotor and the stopping shoulder; and   a weight portion that extends from a portion of an outer circumference of the coupling portion.   
     
     
         15 . The scroll type compressor of  claim 14 , wherein the coupling portion is configured to couple to the rotatable shaft based on sliding along the rotatable shaft to decrease a clearance defined between the coupling portion and the rotatable shaft. 
     
     
         16 . The scroll type compressor of  claim 15 , wherein the coupling portion is configured to be fixed to the rotatable shaft based on the rotor being press-fitted with the rotatable shaft. 
     
     
         17 . The scroll type compressor of  claim 14 , further comprising an anti-rotation mechanism configured to restrict rotation of the balance weight relative to the rotatable shaft. 
     
     
         18 . The scroll type compressor of  claim 17 , wherein the anti-rotation mechanism comprises:
 a groove defined in the rotor; and   a protrusion that protrudes from the coupling portion and that is configured to be inserted into the groove.   
     
     
         19 . The scroll type compressor of  claim 17 , wherein the anti-rotation mechanism comprises:
 a pin installed on the rotor; and   a pin hole defined in the coupling portion and configured to receive the pin.   
     
     
         20 . The scroll type compressor of  claim 17 , wherein the motor comprises a plurality of plates, and
 wherein the anti-rotation mechanism comprises:
 a rivet that fixes the plurality of plates to one another, and 
 a rivet hole defined at the balance weight and configured to receive a head of the rivet.