Fluid machine

Abstract

In a spiral wrap of at least a movable scroll, grooves are formed at given intervals to extend from a halfway point of a top face of the spiral wrap through the lateral face of the spiral wrap, substantially perpendicular to the lateral face of the spiral wrap in a direction of formation of the spiral wrap.

1 . A fluid machine comprising:
 a rotary shaft that extends within a container and is rotatably supported by the container;   a crank pin that is formed integrally with the rotary shaft so as to be eccentrically located in an upper end of the rotary shaft; and   a scroll unit that is installed in the container, has a fixed scroll formed integrally with the container and a movable scroll that orbits around an axis of the fixed scroll when coupled with the crank pin and driven by the rotary shaft, engages a lateral face of a spiral wrap formed upright in an end plate face of the movable scroll with a lateral face of a spiral wrap formed upright in an end plate face of the fixed scroll by using the orbiting motion of the movable scroll, engages a top face of the spiral wrap of the movable scroll with the end plate face of the fixed scroll, engages a top face of the spiral wrap of the fixed scroll with the end plate face of the movable scroll, and carries out a sequence of processes of compression and expansion of working fluid by increasing and decreasing the capacity of gaps formed between the spiral wraps, wherein:   lubrication oil is supplied to between the movable scroll and the fixed scroll; and   in the spiral wrap of at least the movable scroll, if not both the movable and fixed scrolls, grooves are formed at given intervals to extend from the halfway point of the top face of the spiral wrap through the lateral face of the spiral wrap, substantially perpendicular to the lateral face in a direction of formation of the spiral wrap.   
   
   
       2 . The fluid machine according to  claim 1 , wherein:
 each of the grooves is formed in the spiral wrap to extend halfway across the lateral face of the spiral wrap.   
   
   
       3 . The fluid machine according to  claim 1 , wherein:
 each of the grooves is formed to extend to the end plate face.   
   
   
       4 . The fluid machine according to  claim 1 , wherein:
 the grooves are formed in at least either one of an inner circumferential surface and an outer circumferential surface of the spiral wrap.