JPS6346989Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a water flow switch that can detect flow rates at multiple points.

A conventional butterfly valve type water flow switch will be explained based on FIG. 1. A butterfly valve 2 is rotatably supported at one end within a water flow switch body 1 made of a copper alloy, and a magnet 3 is fixed to the valve 2. . The valve 2 is energized to close the flow path 4 when there is no water flow, and rotates to open the flow path 4 in approximately proportion to the flow rate when water flow occurs. Therefore, when the flow rate exceeds a predetermined amount, the reed switch 5 provided on the reed switch mounting plate 6 outside the water flow switch body 1 is activated by the magnet of the valve 2.

The above-mentioned water flow switch determines whether or not there is a water flow by detecting the flow rate at one point, but a demand has arisen for a water flow switch that can detect the flow rate at multiple points, especially at two points. Ta.

Two water flow switches have been proposed to meet this need. The first water flow switch is connected to the second water flow switch.
As shown in the figure, two reed switches 5a and 5b are installed offset in the direction of movement of the valve 2. This means that the mounting dimensions are larger, the reed switch mounting plate 6a needs to be twice as large as the mounting plate 6 shown in Fig. 1, and adjustment of the operating water volume is not easy as it must be done by changing the mounting position. There is a problem.

The second water flow switch is as shown in Figure 3.
Two reed switches 5a and 5b are mounted on a mounting plate 6 in a superimposed manner. Although there is no problem with the mounting dimensions and the mounting plate, there is a problem in that there is almost no difference in the amount of operating water between the two reed switches 5a and 5b, and adjustment is difficult.

This invention is intended to solve the above problems, and its purpose is to provide a water flow switch that is compact and allows easy adjustment of the amount of operating water.

This invention will be described below based on embodiments shown in the accompanying drawings.

As shown in FIG. 4, a butterfly valve 2 is rotatably supported at one end on the inner wall of the switch body 1.
When the flow rate is zero, the valve 2 is energized to substantially close the flow path 4, and rotates to open the flow path 4 approximately in proportion to the flow rate. A magnet 3 is fixed near the other end of the valve 2 or in the center.

A reed switch mounting plate 6 is provided outside the switch body 1 in the vicinity of the moving direction of the magnet 3, and the mounting plate 6 has two reed switches 5a and 5 mounted thereon.
b are attached by screws 8 in an overlapping manner. A magnetic material (an object that is attracted by a magnet, such as iron plate, SUS430, ferromagnetic material, etc.) 9 is fixed to one of the reed switches 5b. They are fixed together with screws 8.

This invention has the above-described structure, and when the flow rate is gradually increased, the valve 2 is gradually pushed up and rotated by the water flow, so that only the reed switch 5a without the magnetic body 9 is operated. That is, as shown in FIG. 5, a part of the magnetic field lines from the magnet 3 are deflected by the magnetic body 9 as shown by d and hardly pass through the main part of the reed switch 5b, so the reed switch 5b has no effect. The other part of the magnetic field lines passes through the main part of the reed switch 5a as shown in e, and operates the reed switch 5a. Further increasing the flow rate will result in
Valve 2 further approaches reed switches 5a, 5b. At this time, a part of the magnetic field lines of the magnet 3 are deflected by the magnetic body 9 as shown in FIG.
is sufficiently close to the reed switch 5b, the lines of magnetic force pass through the main part of the reed switch 5b and actuate the reed switch 5b. Furthermore, the lines of magnetic force pass through the main part of the reed switch 5a as indicated by g, and continue to act on the same reed switch 5a.

Furthermore, when the water is cut off, the reed switches 5b and 5a become inactive in this order due to the reverse effect as described above.

In addition, in the embodiments described above, when adjusting the amount of operating water for the reed switch 5b, the size and position of the magnetic body 9 may be changed. That is, the magnetic material 9
If the magnet 3 is made thicker, the effect of deflecting a part of the magnetic lines of force of the magnet 3 becomes greater, so the lines of magnetic force do not pass through the main part of the reed switch 5b until the magnet 3 approaches the reed switch 5b considerably.

Therefore, if the magnetic material 9 is made thicker, the flow rate when the reed switch 5b operates can be increased, and if the magnetic material 9 is made thinner, the reed switch 5 can be activated even when the flow rate is small.
b works.

Further, even if the magnetic body 9 has the same thickness, the flow rate when the reed switch 5b is activated can be changed depending on whether it is attached closer to the magnet 3 or separated.

Further, when the magnetic body 9 is fixed to the reed switch 5b, it is desirable that the distance from the reed switch 5a is as large as possible so as not to affect the reed switch 5a. Furthermore, although two reed switches are used in the embodiment, three or more reed switches may be mounted one on top of the other, and a magnetic material may be fixed to at least one of the reed switches.

As described above, in this invention, a plurality of reed switches are mounted one on top of the other, so the mounting plate etc. are simplified and the overall size is not so large, making it compact. Also, the size of the magnet,
By changing the mounting position, there is an advantage that the operating water amount of one reed switch can be easily adjusted without substantially affecting the operating water amount of the other reed switch.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of a conventional water flow switch, Figures 2 and 3 are sectional views showing a proposed example of a water flow switch that detects flow rates at two points, and Figure 4 is an example of this invention. 5 and 6 are cross-sectional views showing the operation. 1...Switch body, 2...Valve, 3...Magnet,
4... Channel, 5, 5a, 5b... Reed switch, 6, 6a... Mounting plate, 8... Screw, 9... Magnetic material.

Claims (1)

[Scope of utility model registration request] It consists of a valve that is displaced depending on the flow rate, a magnet attached to the valve, and a plurality of reed switches that are stacked and attached on a surface facing the displacement direction of the valve, and has at least one reed. When the above valve is displaced to a predetermined position, the switch has a
A water flow switch characterized in that a magnetic body is fixed for deflecting a part of the magnetic line of force of the magnet to put the one reed switch in an inoperable state.