| 摘要 |
PROBLEM TO BE SOLVED: To provide a water flow switch capable of detecting a water flow without erroneous detection even in an unstable water flow containing bubbles.SOLUTION: A water flow switch includes: a vane wheel rotatable with a rotation axis provided within a water passage as a center; and a detection switch whose ON/OFF state is changed accompanied with a displacement of the vane wheel upon receipt of a water flow. The vane wheel displaced upon receipt of the water flow is energized by an energizing spring in a direction of returning to a position before the displacement, and a resistance imparting part for imparting a resistance to an action by which the energizing spring is returned is kept provided. Thereby, the water flow is weakened, and even if the vane wheel tries to return to an original position, a returning action is suppressed and the putting of the detection switch into an off state can be delayed. As a result, even in an unstable water flow including bubbles, the water flow can be detected without an erroneous detection. |
