| 摘要 |
PROBLEM TO BE SOLVED: To provide a water flow detection device capable of avoiding that detection of water flow is made impossible instantaneously, by using a water flow sensor even when a large air bubble occurs in water flowing through a water passage.SOLUTION: As a water passage for guiding water to a water flow sensor, a part of a plurality of passages (a part of a plurality of lines of passages) and a part of single passage (a part of one line of passage) are provided and two parts are connected with a connection part. Therein, the connection part is formed in such a shape that water flowing-in from one side passage of the part of the plurality of passages collides with water flowing-in from the other side passage or water flowing-in from the single passage part collides with an inner surface of the connection part and, thereby, the direction of water flow is changed. Thus, a flow direction of air (air bubble) and a flow direction of water which accord with each other until an air bubble reaches the connection part are turned to disaccord with each other and the shape of the air bubble is significantly deformed. As the result, while the air bubble is split and is made smaller, the air bubble is caused to flow into the water flow sensor and, therefore, such a situation that the detection of water flow is made impossible instantaneously can be avoided. |
