Patent ID: 7238011

Claim:
A scroll compressor comprising: a fixed scroll including a fixed end plate, a fixed spiral wall protruding from the fixed end plate, and a discharge hole formed near the center of the fixed end plate, wherein the fixed spiral wall comprises an inner face, an outer face, and an inner end portion located at a center side of the fixed end plate, the inner end portion including a terminal end having an arc-shaped terminal face connecting the inner face and the outer face, the discharge hole located so that a given clearance is secured in between the discharge hole and the inner end portion of the fixed spiral wall; a movable scroll mated with said fixed scroll, said movable scroll including a movable end plate disposed to face the fixed end plate and a movable spiral wall protruding from the movable end plate toward the fixed end plate and engaging with the fixed spiral wall to form a compression chamber in cooperation with the fixed spiral wall, wherein the movable spiral wall comprises an inner face, an outer face, and an inner end portion located at a center side of the movable end plate, the inner end portion having a terminal end with a terminal face, the terminal end of the inner end portion of the movable spiral wall being bigger than the terminal end of the inner end portion of the fixed spiral wall; a drive unit for driving said movable scroll to revolve with respect to said fixed scroll, the revolving movement of said movable scroll causing a series of processes including suction of working fluid into the compression chamber, compression of the sucked working fluid, and discharge of the compressed working fluid from the compression chamber through the discharge hole; and wherein a curvature radius of the terminal face of the fixed spiral wall is smaller than a curvature radius of the terminal face of the movable spiral wall, a curvature radius of the inner face of the fixed spiral wall is greater than a curvature radius of the inner face of the movable spiral wall, and curvature radiuses of the inner faces of the fixed and movable spiral walls are greater than curvature radiuses of the terminal faces of the fixed and movable spiral walls.