JPH0412338B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a water supply control device that automatically controls the water supply to a water washer such as a toilet bowl or a washbasin based on the use of the water washer by a sensing part, and more specifically, a water supply control device that automatically controls the water supply to a water washer such as a toilet bowl or a hand wash basin based on the use of the water washer by a sensing section. A sensing part that has a light emitting element and a light receiving element to detect the use of the water washer, and a control part that controls the operation of the water supply part based on the sensing signal input from the sensing part. .

<Prior art> Conventionally, this type of water supply control device, as disclosed in Japanese Patent Application Laid-Open No. 59-126831, uses a battery to project infrared rays from a light emitting element, which is reflected by the user of the toilet. When a light-receiving element receives the light, it outputs a sensing signal and opens the valve of the water supply. Compared to light
There are some that have significantly reduced power consumption.

<Problems to be Solved by the Invention> However, in such conventional water supply control devices, the light emitting element is only operated intermittently, so there is a risk that malfunctions may occur due to the influence of external light, etc. There was a problem.

In view of such conventional circumstances, the present invention aims to prevent malfunctions due to external light, etc., while providing intermittent light projection.

<Means for Solving the Problems> The technical means taken by the present invention to solve the above problems is to connect a pulse generation circuit that emits light intermittently with a cycle of several seconds to the light emitting element of the sensing section, and The device is characterized in that an auto-zero circuit is connected to the element, which stores the level of disturbance light just before the light is projected and subtracts it from the reflected light with respect to the projected light.

<Function> According to the above-mentioned technical means, the present invention memorizes the disturbance light level immediately before the light is intermittently projected from the light projecting element in the auto-zero circuit, and subtracts it from the reflected light for the projected light, thereby eliminating the disturbance. The user senses the signal based on the signal that remains after the light is removed.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

In this embodiment, as shown in FIG. 1, the water washer 1 is a urinal 1a, and above the urinal 1a,
To be more precise, the sensing part 2 is embedded in an opening A1 in the wall _A1 at a height corresponding to the height of the user's chest when the user is standing in front of the urinal 1a. It is.

The sensing part 2 is a light emitting element 2 made of a light emitting diode.
a, and a light receiving element 2b consisting of a phototransistor.
It is a diffuse reflection type infrared sensor with
The light projecting element 2a diffusely reflects the output of the pulse generating circuit 2c when it hits a standing user, and a part of the reflected light is received by a light receiving element and converted into an electrical signal.

The output of the light receiving element 2b is amplified by an amplifier circuit 2d and sent to an auto-zero circuit 2e.

Auto-zero circuit 2e Remember the level of disturbance light such as sunlight or fluorescent lamps just before the light is projected, and by subtracting this from the level of reflected light from the light projection, the disturbance light is canceled and the signal after cancellation is made higher than a certain level. The presence or absence of a user is determined based on whether the level is above or below, and this sensing signal is sent to the control section 3 via the level recovery circuit 2f.

In this embodiment, the control section 3 includes a 5 second prohibition timer circuit 3a, a 1 second output timer circuit 3b, a 20 msec timer circuit 3c, a load direction selector circuit 3d, and a load driver circuit 3e, as shown in the block diagram of FIG. When a sensing signal is sent from the level recovery circuit 2f, the 5-second prohibition timer circuit 3a is activated at the same time.

In order to prevent malfunction, the 5-second prohibition timer circuit 3a does not output an output unless the sensing signal from the level recovery circuit 2f continues for 5 seconds, and if the output from the level recovery circuit 2f disappears after 5 seconds have elapsed, , activates the 1 second output timer circuit 3b,
The 1 second output timer circuit 3b outputs an output.

This output corresponds to the operating time of the water supply section 4 and is output for 1 second, but due to the rise and fall of this output, the
The second timer circuit 3c is activated, and the load direction selector circuit 3b determines the current flow direction of the load driver circuit 3e, and the water supply unit 4 is activated in accordance with the current flow of the load driver circuit 3e.

That is, when the 1 second output timer circuit 3b is activated,
At the same time, a water supply unit 4 (to be described later) receives current from a battery 5 such as lithium, which is separately connected to the control unit 3.
The drive solenoids 4a and 4b are energized for 20 msec, and one second after the start of energization, the drive solenoid 4a is energized again in the opposite direction to the above current.

The water supply section 4 has a diaphragm 4 as shown in FIG.
A plunger 4e is operated by drive solenoids 4a and 4b, and a pilot hole 4d is opened in the center of the plunger 4e.
The valve section 4g is opened and closed by moving the lower surface of the diaphragm 4c toward and away from the valve seat 4f, thereby supplying water to the urinal 1a. It is clamped and fixed between the plates 4h and 4i so as to cover their upper and lower surfaces, respectively.

A fixed head 4j is arranged on the upper flux plate 4h inside one of the drive solenoid 4a in which the plunger 4e is installed, and a spring 4k is installed between the head 4j and the plunger 4e.
The drive solenoid 4a is equipped with a
Place the permanent magnet 4l on the upper and lower flux plates 4h, 4.
It is clamped and fixed between the points i.

Inside the other driving solenoid 4b, iron cores 4m and 4n fixed to upper and lower flux plates 4h and 4i, respectively, are arranged, and a permanent magnet 4o is clamped and fixed between these iron cores 4m and 4n.

Next, to explain the operation of the water supply section 4, in a normal state, the magnetic fluxes generated by the permanent magnets 4l and 4o are in the same phase with each other, so the magnetic flux is transferred from the upper flux plate to the permanent magnet 4l. 4h, through both iron cores 4m and 4n, through the lower flux plate 4i, and through the head 4j and plagiar 4e.

Therefore, the pilot hole 4d is closed by the lower surface of the plunger 4e, and the valve portion 4g remains closed.

Now, when the drive solenoids 4a and 4b are energized for a moment, the polarity of the permanent magnet 4o changes and becomes the opposite phase to the permanent magnet 4l, and the plunger 4e is attracted to the head 4j by the action of the drive solenoid 4a and is closed. Pilot hole 4d opens,
Water in the pressure chamber 4p formed behind the diaphragm 4c is discharged to the secondary side through the pilot hole 4d, and the valve portion 4g opens when the lower surface of the diaphragm 4c separates from the valve seat 4f.

In this state, the magnetic flux of the permanent magnet 4l is transmitted to the upper flux plate 4h, the head 4j, and the plunger 4e.
The magnetic flux of the permanent magnet 4o forms a circuit from the iron core 4m through the upper flux plate 4h, the head 4j, the plunger 4e, the lower flux plate 4i, and the iron core 4n, and then passes through the plunger 4e. remains attracted to the head 4j, that is, maintains the open state shown in FIG.

Furthermore, in order to change the valve from the open state to the closed state again, by momentarily passing current in the reverse direction to the drive solenoid 4a, magnetic flux of different phases is generated between the head 4j and the plunger 4e, causing the head 4j and the plunger 4e to The two permanent magnets 4l,
The polarities of 4o are in phase with each other, resulting in the state shown in FIG. 4 above.

Incidentally, in the above embodiment, the water washer 1 is the urinal 1.
Although the case of case a is shown, the present invention is not limited to this, and for example, the water washer 1 may be a hand wash basin 1b as shown in FIG.

In this case, a sensing unit 2 is provided on the wall W of the rear upper surface of the handwash basin 1b, and the sensing unit 2 senses the human body by infrared rays emitted from the body of a person who approaches the handwash basin 1b to wash their hands, and the sensing unit 2 senses the human body and supplies water. When the part 4 is energized and the water supply starts from the water discharging device _1b1 , and the human body is removed from the wash basin 1b, the infrared rays that enter the sensing part 2 disappear, and when the sensing signal disappears, the water supply is stopped. There is.

Further, in the embodiment described above, the sensing section 2 is connected to the wall surface A.
Although the sensing part 2 is installed in an embedded manner, the mounting structure of the sensing part 2 is not limited to what is shown in the drawings and may be arbitrary. Furthermore, the valve structure of the water supply part 4 is also not limited to what is shown in the drawings but is arbitrary.

<Effects of the Invention> Since the present invention has the above configuration, it has the following advantages.

The auto-zero circuit memorizes the disturbance light level immediately before the light is intermittently emitted from the light emitting element, and by subtracting this from the reflected light from the emitted light, the user senses it based on the signal that remains after the disturbance light is removed. Therefore, even with intermittent light projection, malfunctions due to external light, etc. can be prevented.

Therefore, compared to conventional systems that emit light intermittently from the light emitting element, the light emitting power is lower and the amount of current to the sensing section can be reduced, reducing power consumption without degrading reliability. .

Therefore, the battery life is extended.

It is easy to replace the existing one and wiring is also easy.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional side view of a water supply control device showing an embodiment of the present invention, Fig. 2 is a block diagram of the sensing section and control section, Fig. 3 is a time chart, and Fig. 4 is an enlarged longitudinal section of the water supply section. 5 shows the valve in the closed state, FIG. 5 is an enlarged vertical cross-sectional view of the water supply section and shows the valve in the open state, and FIG.
Figure 7 is a block diagram of the sensing section and control section, and Figure 8
The figure shows the same time chart. DESCRIPTION OF SYMBOLS 1...Washer, 2...Sensing unit, 2a...Light emitter, 2b...Light receiving element, 2c...Pulse generation circuit, 2e...Auto zero circuit, 3...Control unit, 4
...Water supply department.

Claims (1)

[Claims] 1 Equipped with a water washer, a sensing section that has a light emitting element and a light receiving element to detect the use of the water washer, and a control section that controls the operation of the water supply section based on a sensing signal input from the sensing section. In the water supply control device, a pulse generation circuit that emits light intermittently every few seconds is connected to the light emitting element of the sensing section, and the light receiving element stores the disturbance light level immediately before the light emitted and reflects the light. A water supply control device characterized by connecting an auto-zero circuit that draws from light.