Scroll Fluid Machine

Abstract

There is provided a scroll fluid machine in which sealability is improved by uniforming a deformed shape of a fastened face of a spindle frame with respect to a fixed scroll, and compression performance is improved. The machine is characterized by comprising a scroll unit disposed in a container, a spindle frame that is interfitted in the container, fastened to the fixed scroll by fastening means at an outer circumferential portion, and houses the movable scroll in a space created between the spindle frame and the fixed scroll, a refrigerant path that is formed in the outer circumferential portion to penetrate the fixed scroll and the spindle frame in an axial direction to open in a rear face of the spindle frame, and guides a high-pressure refrigerant compressed and discharged by the scroll unit to the rear face side of the spindle frame, and a countersunk section that is formed in an opening rim of the refrigerant path of the spindle frame.

1 . A scroll fluid machine comprising:
 a rotary shall that stretches in a container and is freely supported by the container;   a crank pin that is eccentrically and integrally formed in an upper end side of the rotary shaft;   a scroll unit that is disposed in the container, includes a fixed scroll and a movable scroll that orbits around an axis of the fixed scroll by being connected with the crank pin and driven by the rotary shaft, engages a spiral wrap of the movable scroll with a spiral wrap of the fixed scroll by causing the movable scroll to make the orbital motion, and carries out a series of process including the compression and discharge of a working fluid while reducing the volume of a space created between the spiral wraps;   a spindle frame that is interfitted in the container, fastened to the fixed scroll by fastening means at an outer circumferential portion, penetrates to support the rotary shaft at the center, and houses the movable scroll connected to the crank pin in a space created between the spindle frame and the fixed scroll so as to allow the movable scroll to make the orbital motion;   a refrigerant path that is formed in the outer circumferential portion to penetrate the fixed scroll and the spindle frame in an axial direction to open in a rear face of the spindle frame, and guides a high-pressure refrigerant compressed and discharged by the scroll unit to the rear face side of the spindle frame; and   a countersunk section that is formed in an opening rim of the refrigerant path of the spindle frame, the scroll fluid machine wherein a recessed section is fanned in a predetermined position symmetric to the countersunk section across the axis.   
     
     
         2 . The scroll fluid machine according to  claim 1 , wherein the recessed section is formed to be on a concentric circle and point-symmetric relative to the countersunk section across the axis. 
     
     
         3 . The scroll fluid machine according to  claim 1 , wherein:
 the refrigerant path and the countersunk section are plurally formed, and   the predetermined position is plurally provided to be symmetric to the countersunk sections across the axis.   
     
     
         4 . The scroll fluid machine according to  claim 1 , wherein:
 the refrigerant path and the countersunk section are plurally formed, and   the predetermined position is located in a given area between positions symmetric to the countersunk sections across the axis.