| 摘要 |
PROBLEM TO BE SOLVED: To reduce the manufacturing cost of a scroll compressor while preventing the cracking and breakage of a joint portion (the root of a spiral wall) on the spiral center side and decreasing efficiency of the compressor. SOLUTION: The radius (r) of curvature of a joint portion 12a between a spiral wall 12 and a base 11 is made constant over the whole periphery in the spiral direction and an angular portion 12b of the spiral wall 12, corresponding to the, joint portion 12a, is formed in an approximately circular shape. Therefore, no recombination of an end mill is required over the whole periphery in the spiral direction and machining work is done by one end mill, resulting in a less number of manufacturing processes. As a rounded portion 12c is formed on the angular portion 12b, a gapδformed between the angular portion 12b and the joint 12a can be smaller. The manufacturing cost can be reduced, accordingly, while preventing the cracking and breakage of the joint 12a on the spiral center side and the decreasing efficiency.
|
