Scroll compressor and method of manufacturing the same

Abstract

A scroll compressor includes a fixed scroll including a spiral unit, an orbiting scroll including a spiral unit and combined with the spiral unit of the fixed scroll to form a compression chamber for compressing refrigerant, a main shaft for transmitting drive power to the orbiting scroll, an electric motor unit configured to rotate the main shaft, and a first balancer for compensating unbalance of the orbiting scroll with respect to a rotation center of the main shaft. The first balancer has an outline in a cylinder shape, and includes a high-density part made of a high-density material, and a low-density part made of a low-density material having a density lower than a density of the high-density material.

1 . A scroll compressor comprising:
 a fixed scroll including a spiral unit;   an orbiting scroll including a spiral unit and combined with the spiral unit of the fixed scroll to form a compression chamber for compressing refrigerant;   a main shaft for transmitting drive power to the orbiting scroll;   an electric motor unit configured to rotate the main shaft; and   a first balancer for compensating unbalance of the orbiting scroll with respect to a rotation center of the main shaft,   the first balancer having an outline in a cylinder shape, and including a high-density part made of a high-density material, and a low-density part made of a low-density material having a density lower than a density of the high-density material,   the low-density part covering an outer peripheral surface of the high-density part.   
     
     
         2 . The scroll compressor of  claim 1 , wherein
 the low-density part of the first balancer includes a shaft hole through which the main shaft is provided, a high-density part housing hole for housing the high-density part, and a low-density part fastening hole for fastening with the high-density part,   the high-density part of the first balancer includes a high-density part fastening hole for fastening with the low-density part of the first balancer, and   positions of the high-density part fastening hole of the first balancer and the low-density part fastening hole of the first balancer are aligned, and the high-density part of the first balancer and the low-density part of the first balancer are fastened to each other through a first fastening member with the high-density part of the first balancer being fitted into the high-density part housing hole.   
     
     
         3 . The scroll compressor of  claim 1 , wherein
 the first balancer is provided above the electric motor.   
     
     
         4 . The scroll compressor of  claim 1 , further comprising a slider supporting the orbiting scroll, wherein
 the first balancer is attached to the slider.   
     
     
         5 . The scroll compressor of  claim 1 , further comprising a second balancer provided below the electric motor unit for compensating unbalance of the orbiting scroll with respect to the rotation center of the main shaft, wherein
 the second balancer has an outline in a cylinder shape, and includes a high-density part made of a high-density material, and a low-density part made of a low-density material having a density lower than a density of the high-density material.   
     
     
         6 . The scroll compressor of  claim 5 , further comprising a sub bearing supporting a lower part of the main shaft, wherein
 the second balancer is provided at a position closer to the sub bearing than the electric motor unit.   
     
     
         7 . The scroll compressor of  claim 5 , wherein
 the electric motor unit includes a rotor and a stator,   the low-density part of the second balancer is provided with a low-density part fastening hole for fastening with the rotor,   the high-density part of the second balancer is provided with a high-density part fastening hole for fastening with the rotor, and   the high-density part of the second balancer and the low-density part of the second balancer are fastened to the rotor through a second fastening member.   
     
     
         8 . A method of manufacturing the scroll compressor of  claim 2 , comprising assembling the first balancer by
 aligning the positions of the high-density part fastening hole of the first balancer and the low-density part fastening hole of the first balancer,   fitting the high-density part of the first balancer into the high-density part housing hole, and   fastening the high-density part of the first balancer and the low-density part of the first balancer through the first fastening member.   
     
     
         9 . A method of manufacturing the scroll compressor of  claim 7 , comprising
 attaching the second balancer to the rotor by fastening the high-density part of the second balancer and the low-density part of the second balancer to the rotor through the second fastening member.   
     
     
         10 . The scroll compressor of  claim 1 , wherein
 the low-density part comprises a resin material.   
     
     
         11 . The scroll compressor of  claim 4 , wherein
 the slider includes an oil drain gap for draining oil.   
     
     
         12 . The scroll compressor of  claim 11 , further comprising an orbiting bearing provided opposite to the compression chamber with reference to the orbiting scroll, and supported to orbit freely by an eccentric slider shaft portion installed on an upper part of the main shaft,
 wherein the oil drain gap is provided below a lower end of the orbiting bearing.   
     
     
         13 . The scroll compressor of  claim 12 , wherein
 the orbiting bearing comprises a parallel sliding bearing, and   the slider is arranged such that a position in a height direction of an action central point of centrifugal force of the entire slider is set to be equal to a position in a height direction of a center of the orbiting bearing.