| 摘要 |
PROBLEM TO BE SOLVED: To provide a submergible motor condensation preventive structure capable of keeping an initial cost and a running cost at a low degree without upsizing and complicating a motor frame and consuming excessive power, and obtaining a safe, certain, and permanent condensation preventive effect. SOLUTION: In an airtight submergible motor having an airtight hole 2 in a shaft sealing chamber side, the inside of a motor frame 1 is evacuated by sucking from the airtight hole 2. Therefore, in this condensation preventive structure, the inside of a motor is in a vacuum state, so that condensation is not occurred and a spark is not caused.
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