Scroll compressor

Abstract

A scroll compressor includes a casing, an electric motor housed in the casing, a drive shaft driven by the electric motor, a compression mechanism, a housing and an oil transfer mechanism. The compression mechanism has movable and fixed scrolls. The movable scroll has an engaging portion engaging one end of the drive shaft. The housing includes a bearing supporting the drive shaft and a receiving portion receiving the engaging portion. The oil transfer mechanism transfers oil in an oil reservoir of the casing. The drive shaft is provided. with an oil supply passage supplying the oil transferred by the oil transfer mechanism to a sliding portion of the engaging portion. The housing is provided with a recess provided on a bottom of the receiving portion and an oil supply channel delivering the oil in the recess to a. sliding portion of the compression mechanism.

1 . A scroll compressor, comprising:
 a casing;   an electric motor housed in the casing;   a drive shaft driven by the electric motor;   a compression mechanism having a movable scroll and a fixed scroll, the movable scroll having an engaging portion with which one end of the drive shaft engages, and the movable scroll rotating eccentrically relative to the drive shaft;   a housing including a bearing supporting the drive shaft, and a receiving portion receiving the engaging portion; and   an oil transfer mechanism transferring oil in an oil reservoir of the casing,   the drive shaft being provided with an oil supply passage supplying the oil transferred by the oil transfer mechanism to a sliding portion of the engaging portion, and   the housing being provided with
 a recess provided on a bottom of the receiving portion, the oil accumulating in the recess after lubricating the sliding portion of the engaging portion, and 
 an oil supply channel delivering the oil in the recess to a sliding portion of the compression mechanism, 
 the recess being configured as an annular groove surrounding an entire periphery of the bearing. 
   
     
     
         2 . (canceled) 
     
     
         3 . A scroll compressor comprising:
 a casing;   an electric motor housed in the casing;   a drive shaft driven by the electric motor;   a compression mechanism having a movable scroll and a fixed scroll, the movable scroll having an engaging portion with which one end of the drive shaft engages and the movable scroll rotating eccentrically relative to the drive shaft;   a housing including a bearing supporting the drive shaft, and a receiving portion receiving the engaging portion; and   an oil transfer mechanism transferring oil in an oil reservoir of the casing,   the drive shaft being provided with an oil supply passage supplying the oil transferred by the oil transfer mechanism to a sliding portion of the engaging portion, and   the housing being provided with
 a recess provided on a bottom of the receiving portion. the oil accumulating in the recess after lubricating the sliding portion of the engaging portion, 
 an oil supply channel delivering the oil in the recess to a sliding portion of the compression mechanism, and 
 an oil exhaust channel delivering the oil in the receiving portion to the oil reservoir, an inlet port of the oil exhaust channel being opened to an inside of the recess. 
   
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . The scroll compressor of  claim 3 , wherein the inside of the recess is partitioned, by a partition member extending from a bottom of the recess to an open end of the recess, into
 a first space which communicates with an inlet port ( 90   a ) of the oil supply channel and   a second space which communicates with the inlet port of the oil exhaust channel, and   
       the first space has a larger volume than the second space. 
     
     
         7 . (canceled)