| 摘要 |
PROBLEM TO BE SOLVED: To suppress interference in the direction of an axis by a fixed scroll and a rotating scroll even when a casing and a rotating shaft are expanded thermally in the direction of the axis during operation. SOLUTION: Fixed scrolls 6A and 6B are provided firmly at both ends separately in the direction of an axis in a casing 1. And the rotating shaft 21 is arranged in the direction of an axis between these fixed scrolls 6A and 6B, and this rotating shaft 21 is capable of rotating movement by eccentric bearings 13A and 13B. Furthermore, the rotating scrolls 24A and 24B are provided firmly at both ends of the rotating shaft 21, and the rotating shaft 21 is run by an electric motor 10. And the thermal expansion rateα1 of the casing 2 is set as approximately twice to the thermal expansion rateα2 of the rotating shaft 21. When the temperature of the casing 2 rises to T1 during operation and the temperature T2 of the rotating shaft 21 goes up to approximately twice to the temperature T1,ΔL1 of the thermal expansion amount of the casing 2 andΔL2 of the thermal expansion amount of the rotating shaft 21 are made to become an almost equivalent.
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