| 摘要 |
According to one embodiment, a flow channel opening and closing device includes a first rotating plate (23) provided rotatably along a face which crosses two adjacent flow channels, having a first fluid passing hole (23a) which overlaps with each of the two flow channels midway during rotation, which fully opens the one flow channel and blocks the other flow channel at a region except the first fluid passing hole (23a) by making the first fluid passing hole (23a) overlap with the one flow channel, and a second rotating plate (24) provided adjacent to the first rotating plate (23) and rotatably along a face which crosses the two flow channels, having a second fluid passing hole (24a) which overlaps with each of the two flow channels midway during rotation, which rotates to a position where the second fluid passing hole (24a) overlaps at least partially with the one flow channel when the first rotating plate (23) rotates to a position where the first fluid passing hole (23a) fully opens the one flow channel. ( FIG. 5 )
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