| 摘要 |
A water tank includes a bottom surface having a suction opening for draining water, and an air-suction preventing member covering the suction opening, spaced with a gap allowing water to flow into the suction opening, above the bottom surface. The air-suction preventing member is so arranged as to interrupt suction of air by the suction opening due to generation of a vortex at the suction opening. The arrangement provides a water tank free of any possible failure and having a simple structure not increasing weight and cost, preventing the air from being sucked in.
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