Scroll compressor

Abstract

A scroll compressor includes a body container that is a hermetically sealed container; a fixed scroll that is fixed to an upper portion of an inside of the body container; an orbiting scroll that is disposed below the fixed scroll; a rotary drive shaft including an oil passing hole that connects an upper side and a lower side in the shaft; a frame that is fixed to an inner peripheral surface of the body container to slidably support the orbiting scroll; a thrust plate that is disposed between a lower surface of the orbiting scroll and a thrust support surface of the frame; an Oldham ring that is accommodated in the frame; and an orbiting-side Oldham groove that guides the Oldham ring, wherein a circumferential groove that communicates with the orbiting-side Oldham groove is formed in the lower surface of the orbiting scroll.

1 . A scroll compressor comprising:
 a body container being a hermetically sealed container;   a fixed scroll fixed to an upper portion of an inside of the body container;   an orbiting scroll disposed below the fixed scroll and, together with the fixed scroll, forming a compression chamber, the orbiting scroll including a boss section at a central portion of a lower surface of the orbiting scroll;   a rotary drive shaft having an eccentric shaft section formed at an upper end portion of the rotary drive shaft, the rotary drive shaft including an oil passing hole connecting an upper side and a lower side in the shaft, the eccentric shaft section being rotatably supported by an orbiting bearing at the boss section of the orbiting scroll;   a frame including a thrust support surface on which the orbiting scroll is placed, a recessed section formed inwardly from the thrust support surface in a radial direction of the body container and accommodating the boss section of the orbiting scroll, and a main bearing section formed at a lower portion of the recessed section and rotatably supporting the rotary drive shaft, the frame being fixed to an inner peripheral surface of the body container;   a thrust plate disposed between the lower surface of the orbiting scroll and the thrust support surface of the frame and that slidably supports the lower surface of the orbiting scroll;   an Oldham ring accommodated in the frame and restricting rotation of the orbiting scroll around an axis of the rotary drive shaft; and   an orbiting-side Oldham groove formed in the lower surface of the orbiting scroll outwardly from the boss section, the orbiting-side Oldham groove accommodating a part of the Oldham ring,   wherein a circumferential groove that communicates with the orbiting-side Oldham groove is formed in the lower surface of the orbiting scroll.   
     
     
         2 . The scroll compressor of  claim 1 , wherein a thrust surface of the orbiting scroll that is supported by an upper surface of the thrust plate is an inclined surface that extends downward and outward in the radial direction. 
     
     
         3 . The scroll compressor of  claim 1 , wherein a frame-side Oldham groove that guides the Oldham ring is formed in the frame, and a cutaway portion that communicates with the frame-side Oldham groove is formed in the thrust plate at a location thereof that faces the frame-side Oldham groove. 
     
     
         4 . The scroll compressor of  claim 1 , wherein the rotary drive shaft is vertically extended. 
     
     
         5 . The scroll compressor of  claim 1 , wherein at least a portion of lubricating oil sucked up to the eccentric shaft section through the rotary drive shaft and the oil passing hole flows to the circumferential groove through the orbiting-side Oldham groove. 
     
     
         6 . A scroll compressor comprising:
 a rotary drive shaft including an oil passing hole through which lubricating oil flows;   an orbiting scroll attached to the rotary drive shaft, the orbiting scroll having an orbiting-side Oldham groove formed in a lower surface thereof;   a frame including a thrust support surface on which the orbiting scroll is placed;   a thrust plate disposed between the lower surface of the orbiting scroll and the thrust support surface of the frame;   wherein a circumferential groove that communicates with the orbiting-side Oldham groove and supplies lubricating oil to a sliding section between the orbiting scroll and the thrust plate is formed in the lower surface of the orbiting scroll.