Scroll compressor
Provided is a scroll compressor with durability improved by effectively reducing strong contact between a wrap of a movable scroll and an end plate of a fixed scroll without impairing a function. A compression chamber 34 formed between wraps 24, 32 of a fixed scroll 21 and a movable scroll 22 is narrowed while moving from the outside to the inside, thereby compressing working fluid. The wrap 32 of the movable scroll 22 has an inclined portion of which a height gradually decreases toward a winding end point P 2 in an area from a point P 1 at which a line L 1 extending outward from the center O of a spiral base circle through an outer wall extension start point S intersects the outermost wrap 32 to the winding end point P 2.
1 . A scroll compressor comprising a compression mechanism including a fixed scroll comprising a disk-shaped end plate and a spiral wrap on a face of the disk-shaped end plate of the fixed scroll and a movable scroll comprising a disk-shaped end plate and a spiral wrap opposing the spiral wrap of the fixed scroll on a face of the disk-shaped end plate of the movable scroll, wherein the movable scroll revolves relative to the fixed scroll and a compression chamber formed between the wraps of both the scrolls is narrowed while moving from an outside to an inside, thereby compressing working fluid,
the wrap of the movable scroll has an inclined portion of which a height gradually decreases toward a winding end point P 2 in an area from a point P 1 at which a line L 1 extending outward from a center of a spiral base circle through an outer wall extension start point intersects an outermost wrap to the winding end point P 2 ,
the inclined portion of the wrap of the movable scroll comprises a first inclined portion, a flat portion, and a second inclined portion, a height of the first inclined portion gradually decreases from a start point of the first inclined portion toward an end point of the first inclined portion, a height of the flat portion does not change from a start point of the flat portion to an end point of the flat portion, a height of the second inclined portion gradually decreases from a start point of the second inclined portion toward the winding end point P 2 , the first inclined portion, the flat portion, and the second inclined portion are continuously formed in the wrap of the movable scroll in the area, and
the height of the end point of the first inclined portion is lower than the height of the start point of the first inclined portion by 10 μm, and the height of the winding end point P 2 of the second inclined portion is lower than the height of the start point of the first inclined portion by 50 μm.
2 . The scroll compressor according to claim 1 , wherein both the scrolls are plated.
3 . The scroll compressor according to claim 1 , wherein a back pressure chamber is formed in a back of the end plate of the movable scroll, and a back pressure hole causing the back pressure chamber and the compression chamber to communicate with each other is formed so as to penetrate the end plate of the movable scroll.
4 . The scroll compressor according to claim 1 , wherein no tip seal is provided at distal ends of the wraps of the fixed scroll and the movable scroll.
5 . A scroll compressor comprising a compression mechanism including a fixed scroll comprising a disk-shaped end plate and a spiral wrap on a face of the disk-shaped end plate of the fixed scroll and a movable scroll comprising a disk-shaped end plate and a spiral wrap opposing the spiral wrap of the fixed scroll on a face of the disk-shaped end plate of the movable scroll, wherein the movable scroll revolves relative to the fixed scroll and a compression chamber formed between the wraps of both the scrolls is narrowed while moving from an outside to an inside, thereby compressing working fluid,
the wrap of the movable scroll has an inclined portion of which a height gradually decreases toward a winding end point P 2 in an area from a point P 1 at which a line L 1 extending outward from a center of a spiral base circle through an outer wall extension start point intersects an outermost wrap to the winding end point P 2 ,
the inclined portion of the wrap of the movable scroll comprises a first inclined portion, a flat portion, and a second inclined portion, a height of the first inclined portion gradually decreases from a start point of the first inclined portion toward an end point of the first inclined portion, a height of the flat portion does not change from a start point of the flat portion to an end point of the flat portion, a height of the second inclined portion gradually decreases from a start point of the second inclined portion toward the winding end point P 2 , the first inclined portion, the flat portion, and the second inclined portion are continuously formed in the wrap of the movable scroll in the area, and
a length of the wrap of the movable scroll is set to be longer in the flat portion than in the first inclined portion and to be longer in the second inclined portion than in the flat portion.