| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnet pump for circulating a cooling water used in a small-sized, portable projector, personal computer, etc., capable of lessening the cooling water circulating amount irrespective of its installed condition and/or service condition and unlikely to generate a change in the cooling performance. SOLUTION: The magnet pump includes a magnet impeller 4 composed of an upper piece 4A and a lower piece 4B, and there a passage part 4b, vane part 4c, and shroud parts 4d and 4e are formed. The upper piece 4A and lower piece 4B assume such shapes as affixed together in the middle of the passage part 4a and can be fixed only by engaging a projection 4f provided on the vane part 4c of the lower piece 4B fast with an engaging hole 4g provided in the vane part 4c of the upper piece 4A. The vane part 4c is furnished with a through hole 4h which agitates the inside of a pump chamber so that bubbles are crushed into smaller fragments and exhausted from a discharge hole 1b.
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