| 摘要 |
a body(1); a DI water line(2) supplying DI(deionized) water to the body(1); a neck tube case(4) installed in the body(1) by arranging a neck tube(3); an air line(5) supplying air to the DI water supplied to the body(1); an air injection tube(7) which comprises an air injection hole(6) formed to inject air from the bottom of the neck tube case(4), being connected to the air line(5); and an overflow line(8) ventilating the spare DI water in the body(1).
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