| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve cost reduction by a relatively simple structure even when a liquid level is controlled not to exceed the upper limit level, contribute to energy saving, contribute to total cost reduction by avoiding waste of materials, improve cooling efficiency, and stabilize cooling temperature. Ž<P>SOLUTION: A coolant tank Tm includes a plurality of coolant tank devices T, etc. according to the number of cooling circuits 11, etc. The devices T, etc. are provided with tank bodies 2, etc. structured to be airtight. The tank bodies 2, etc. are provided with suction/exhaust pipes 3, etc facing the liquid surface Wf, etc. of coolants W, etc. in the bodies 2, etc. from above and having bottom end openings 3d set to a height corresponding to the upper limit liquid level Lwu, etc. and suction/exhaust valves 4, etc. connected to the top end openings 3u, etc. of the pipes 3, etc. The devices T, etc. are provided in each of the plurality of the cooling circuits 11, etc. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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