| 摘要 |
PROBLEM TO BE SOLVED: To efficiently radiate the heat generated in a compression chamber to the external to improve the operation efficiency by making a heat transmission member out of a material having the heat conductivity higher than that of a cylinder member. SOLUTION: A heat transmission member 10 is formed by a cylindrical side wall 10a and a partition part 10b formed on the approximately axial central part of the side wall 10a, and a cylindrical cavity surrounded by the side wall 10a is divided into two zones by the partition part 10b. The shape of the heat transmission member 10 is face symmetrical to the partition part 10b, the cylinder members 5 are respectively inserted into two recessed parts delimited by the partition part 20b and the side wall 10a, and the cylindrical members 5 are closely contacted with the side wall 10a and the partition part 10b. The cylindrical members 5 are used also as the magnet yorks, so that they are made of a material of high magnetic permeability, for example, pure iron. The heat transmission member 10 is made of a material having the heat conductivity higher than that of the cylindrical members 5, for example, copper, aluminum or the like.
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