JPH0694685B2 - Water supply control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a water supply control device for automatically controlling the water supply to a flushing device such as a toilet bowl or a hand-washing device based on the detection of the use of the flushing device by a sensing unit. In particular, it relates to the one in which the driving power source is a battery.

<Prior Art> Conventionally, as a water supply control device of this type, Japanese Patent Laid-Open No. 59-126831
The thing of the gazette is known.

Explaining the one disclosed in Japanese Patent Application Laid-Open No. 59-126831, the water supply section opens the valve section by moving the plunger by energizing the coil, and the valve remains open while energized. Is a general electromagnetic valve that returns to close the valve section.

Therefore, in the conventional device described above, it is necessary to keep the coil energized while the water supply unit maintains the valve open state and supplies a predetermined amount of cleaning water, so that power consumption is reduced even though the drive power source is a battery. It is large and requires a short battery life and frequent battery replacements, which is not only troublesome but also uneconomical.

Therefore, as the water supply unit, by energizing the coil, the plunger is moved to open or close the valve, and the valve state is maintained by the permanent magnet even if the energization to the coil is stopped during the opening and closing of the valve. It is possible to reduce power consumption by using a so-called latching solenoid.However, such a latching solenoid opens when the valve is closed when mechanical vibration such as an earthquake or rapid water pressure fluctuation similar to a water hammer occurs. However, if the user does not use the water for a long time, the wash water will be discharged to the water washing device for a long time.

<Problems to be Solved by the Invention> A problem to be solved by the present invention is to automatically close a latching solenoid that has been opened due to external factors such as vibrations and water pressure fluctuations, even if the user does not use it. That is.

<Means for Solving the Problem> The technical means taken by the present invention to solve the above-mentioned problem is that the water supply unit opens the valve in response to the valve opening signal from the control unit and maintains the valve open state, and at the same time, the valve closing signal. It is composed of a solenoid that closes the valve and maintains the closed state.The control unit outputs the valve closing signal to the solenoid based on the sensing signal from the sensing unit, and the valve closes based on the sensing signal even if a predetermined time has elapsed. It has a timer that outputs a valve closing signal to the solenoid when no signal is output, and outputs a valve closing signal every time a predetermined time elapses unless the valve closing signal based on the sensing signal is output thereafter. To do.

Further, it is preferable that the driving power source is a battery and the latching solenoid that stops the energization of the water supply unit while the water supply unit is open.

<Operation> The present invention starts the timer when the user leaves and outputs the valve closing signal to the latching solenoid, and detects the user before the timer times out and outputs the valve closing signal to the latching solenoid. When the timer is reset to the initial state and the user is not sensed before the timer times out, a valve closing signal is output to the latching solenoid and the timer is restarted to output a valve closing signal every time the timer expires. It is what is output.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

This embodiment shows the case where the flushing device (1) is a urinal (1a) as shown in FIG. 1, and the user is above the urinal (1a), more precisely, before the urinal (1a). A latching solenoid (4a) and a flush valve that form a water supply part (4) while the sensing part (2) is embedded in a wall surface (W) having a height corresponding to the user's chest when standing up (4b) is an embedded type.

The sensing part (2) is a light emitting element (2a) consisting of a light emitting diode.
And a light receiving element (2b) composed of a phototransistor, which is a diffuse reflection infrared sensor, and communicates with a power source (5) of a driving power source through a control section (3).

Light projecting element (2a) is projected infrared by the output from the light projecting drive circuit of the control unit to be described later (3) and contact (3a ₇₎ the circuit (3a _7), use this infrared light A user standing in front of the urinal (1a) to make a flight is diffused and reflected, and a part of this reflected light is received by the light receiving element (2b), whereby a light receiving amplifier circuit (3a ₈ ) described later is provided. Output to.

The control unit (3) is roughly divided into a sensor circuit (3a) that communicates with the light projecting element (2a) and the light receiving element (2b) of the sensing unit (2) to generate a sensing signal, and operates based on this sensing signal. And a drive circuit (3c) for generating an output signal for operating the latching solenoid (4a) by operating on the basis of the drive signal.

The configuration of the sensor circuit (3a) and the control circuit (3b) will be described with reference to FIG. 2. In the sensor circuit (3a), the pulse signal is first continuously transmitted from the multivibrator (3a ₁ ) at a predetermined cycle t, for example, 1 second cycle. This pulse signal is transmitted to 1 /
It is output to the frequency divider (3a ₂ ), the 1/5 frequency divider (3a ₃ ) and the multiplexer (3a ₄ ).

The 1/2 frequency divider (3a ₂ ) obtains 1/2 the frequency of the pulse signal from the multivibrator (3a ₁ ) and continuously emits the pulse signal at a period of 2t, that is, a 2 second period. The 1/5 frequency divider (3a ₃ ) obtains the frequency of 1/5 of the pulse signal from the multivibrator (3a ₁ ) and continuously emits the pulse signal with a period of 5t, that is, a 5 second period. The 2t and 5t pulse signals are also output to the multiplexer (3a ₄ ).

The multiplexer (3a ₄ ) is a flip-flop I (3a ₅ ),
The selection signal given from the flip-flop II (3a ₆ ) is input to output the pulse signal of the period t from the multivibrator (3a ₁ ) or the period 2t is output from the _1/2 divider (3a ₂ ).
Pulse signal of the 1/5 frequency divider (3a ₃ ) or a pulse signal with a period of 5t is selected from the 1/5 frequency divider (3a ₃ ) and the selected output from the multiplexer (3a ₄ ) is the drive circuit for projecting light. (3a ₇ ) and the drive circuit (3
Infrared rays are emitted from the light emitting element (2a) based on the output from the a ₇ ).

That is, the projection cycle of infrared rays from the light projecting element (2a) is selected to t, 2t, or 5t by the selection input from the flip-flop I (3a ₅ ) and the flip-flop II (3a ₆ ).

On the other hand, when the infrared ray is projected from the light emitting element (2a) through the light receiving amplifier (3a ₈ ) that communicates with the light receiving element (2b), the light receiving element (2b) receives the reflected light even once and is used. When the presence of a person is detected, the one-shot circuit (3a ₉ ) with reflected light outputs a one-shot pulse signal, and the pulse signal is transmitted through the OR circuit I (3a ₁₀ ) to the flip-flop I.
(3a ₅ ) and the flip-flop II (3a ₆ ) are input to the set, and the binary counter I (3a ₁₁ ) is also input to the clear.

When a pulse signal is input to the set of flip-flops I II (3a ₅ ) (3a ₆ ), the above multiplexers (3a ₄ )
The Hi pulse is output to the select terminals S ₁ and S _{2 of} the multiplexer, the multiplexer (3a ₄ ) selects the cycle t, the light is emitted from the light projecting element (2a) at the cycle t, and the binary counter I (3a ₁₁ ) Flip-flop II because pulse signal is input to clear
Qn output to clear (3a ₆ ) goes low.

After that, if the user leaves the front of the urinal (1a) and emits infrared rays from the light projecting element (2a), but the light receiving element (2b) no longer receives light, the one-shot circuit without reflected light (3a ₁₂ ) A one-shot pulse signal is output, and this pulse signal is input to the clear of the flip-flop I (3a ₅ ) and also to the clock of the binary counter I (3a ₁₁ ).

When the pulse signal is input to the clear of the flip-flop I (3a ₅ ), the select terminal S ₁ of the multiplexer (3a ₄ ).
Q output of flip-flop I (3a ₅ ) input to
Then, the binary counter I (3a ₁₁ ) starts counting because the pulse signal is input to the clock, but since the Qn output to the clear of the flip-flop II (3a ₆ ) remains Low, the multiplexer (3a ₄ ) The Q output of the flip-flop II (3a ₆ ) input to the select terminal S ₂ is Hi, the multiplexer (3a ₄ ) is switched from the cycle t to 2t, and thereafter, the light is emitted from the light projecting element (2a) at 2t. Light up.

Further, if the light receiving element (2b) continues to receive no light, the count number is increased each time a pulse signal is input from the one-shot circuit without reflected light (3a ₁₂ ) to the clock of the binary counter I (3a ₁₁ ), When this count number is set in advance, for example, when the fourth pulse signal is input, the Qn output to the clear of the flip-flop II (3a ₆ ) becomes Hi for the first time, and the select terminal S of the multiplexer (3a ₄ ) ₂
The input to LOW goes to cycle the multiplexer (3a ₄ )
After switching from 2t to 5t, after that, the light is emitted from the light emitting element (2a) at 5t.

When light is received by the light receiving element (2b) during the transition of the light projecting period from t to 2t and from 2t to 5t, the period is immediately returned to the period t as described above.

Further, the pulse signal output from the one-shot circuit (3a ₉ ) with reflected light is input to the count of the binary counter II (3b ₁ ) forming a part of the control circuit (3b), and the one-shot circuit without reflected light ( pulse signal output from 3a ₁₂₎ is input to clear the binary counter II (3b _1).

Therefore, this binary counter II (3b ₁ ) has reflected light when the user is detected. Since the pulse signal is input from the one-shot circuit (3a ₉ ) to the count, if counting is started and this state continues, there is reflected light. One-shot circuit (3
Each time a pulse signal is input to the count from a ₉ ), the count number is increased and this count number is output to the digital comparator (3b ₂ ), and when the user walks away from in front of the urinal (1a), the reflected light is reflected. None The pulse signal is input to the clear from the one-shot circuit (3a ₁₂ ) and the count number is reset to 0.

The digital comparator (3b ₂ ) uses the count number input from the binary counter II (3b ₁ ) and the detection count setting value preset by the detection count setting circuit (3b ₃ ).
For example, comparing with 4, when the count number is smaller than the detection count setting value 4, it is not output to the flip-flop III (3b ₄ ), but at the same time when the count number becomes larger than the detection count setting value 4 the flip-flop III (3b ₄ ) To Hi, and then the count becomes 0 and Low at the same time
Is output.

When the input from the digital comparator (3b ₂ ) rises from Hi to Low, the flip-flop III (3b ₄ ) is OR'ed.
To circuit I (3a ₁₀ ) and AND circuit (3b ₅ ) and drive circuit (3c)
Output Hi.

At this time, since there is no user, there is no reflected light and there is no output from the one-shot pulse circuit (3a ₉ ) to the set of flip-flops I II (3a ₅ ) (3a ₆ ) via the OR circuit I (3a ₁₀ ). However, instead of this, the Hi output from the flip-flop III (3b ₄ ) is input to the set of flip-flops I II (3a ₅ ) (3a ₆ ) via the OR circuit I (3a ₁₀ ) and from both of them. multiplexer (3a ₄₎ select terminals S _1, the output of the S ₂ are both a Hi multiplexer (3a ₄₎ the period t
To maintain.

The AND circuit (3b ₅ ) connects the other input terminal to the light emission drive circuit (3a ₇ ), and outputs Hi to the drive circuit (3c) at the time of outputting from the circuit (3a ₇ ). At the time, it outputs to the shift of the shift register (3b ₆ ).

The shift register (3b ₆ ) is provided with a plurality of Q outputs instead of Hi each time it is output from the light emission drive circuit (3a ₇ ), and sets the output count set value according to the number of Q outputs. When the Q output becomes Hi, the one-shot pulse circuit (3b ₇ ) outputs a pulse signal.

This pulse signal is input to the clear of the shift register (3b ₆ ) and the flip-flop III (3b ₄ ) and the output from the flip-flop III (3b ₄ ) to the drive circuit (3c) is changed from Hi to Low.
And the output to the OR circuit I (3a ₁₀ ) becomes Low.
To

Therefore, from the OR circuit I (3a ₁₀ ) to the flip-flop I II
There is no output to the set of (3a ₅ ) and (3a ₆ ), and the output from the one-shot circuit without reflected light (3a ₁₂ ) is input to the select terminal S ₁ of the multiplexer (3a ₄ ) and the flip-flop I (3a ₅₎ ) Q output goes low, switching the multiplexer (3a ₄ ) from the cycle t to 2t.

A time chart of the sensor circuit (3a) and the control circuit (3b) is shown in FIG.

The sensor circuit (3a) and the control circuit (3b) are not limited to those shown in the figure, and for example, a microcomputer may be used as part of them.

Next, the structure of the drive circuit (3c) will be described with reference to FIG. 4. The input, that is, the output of Hi from the flip-flop III (3b ₄ ) is the open side AND circuit (3c ₁ ) and the NOT circuit I (3c ₂ ). It is inputted to the closed side AND circuit (3c ₃ ) via the and also inputted to the exclusive OR circuit (3c ₄ ).

The exclusive OR circuit (3c ₄ ) is provided with a flip-flop by interposing a resistor R and a capacitor C on one input side.
When the output from III (3b ₄ ) switches from Low to Hi
Outputs a pulse signal when switching from Low to Low.

Normally, the input to the exclusive OR circuit (3c ₄ ) is Low when it is not detected by the user, so a pulse signal is not output from the circuit (3c ₄ ) and the open drive transistor (3c ₉ ) described later is used. The closing drive transistor (3c ₁₈ ) is kept in the OFF state.

Drive open valve (3c) from flip-flop III (3b ₄ )
Open side AND circuit (3c ₁ ) when the output to is switched from Low to Hi
Hi is input to one input terminal and Low is input to the one input terminal of the closed side AND circuit (3c ₃ ) via the NOT circuit I (3c ₂ ), and from the exclusive OR circuit (3c ₄ ). Outputs a pulse signal.

This pulse signal is input to the flip-flop IV (3c ₅ ) to output Hi, and is also input to another flip-flop V (3c ₆ ) to change the Q output to Hi and the output to Low,
It is also input to the 50msec one-shot timer (3c ₇ ) to start its operation and set the Q output to Hi.

The output of the flip-flop IV (3c ₅ ) and the output of the 50msec one-shot timer (3c ₇ ) are input to the AND circuit (3c ₈ ), but since both are Hi, the circuit (3c ₈ ) is open-side AND. It outputs Hi to the other input terminal of the circuit (3c ₁ ) and the other input terminal of the closed side AND circuit (3c ₃ ), respectively.

Therefore, both of the input terminals of the open side AND circuit (3c ₁ ) become Hi and output to the open drive transistor (3c ₉ ) to be turned on.

When the open drive transistor (3c ₉ ) is turned on, the drive current I is started to flow from the battery (5) which is the drive current to the operation coil (4a ₁ ) of the latching solenoid (4a) described later, and the coil (4a ₁ ) The drive current I applied to the battery is returned to the battery (5) again through the open drive transistor (3c ₉ ) and the resistor R.

At this time, the voltage generated in the open drive transistor (3c ₉ ) is detected by the voltage detection circuit (3c ₁₀ ), and this detection voltage is detected by the peak detection circuit (3c ₁₁ ), the margin addition circuit (3c ₁₂ ), and the bottom detection circuit ( 3c ₁₃ ) and the margin subtraction circuit (3c ₁₄ ).

When the Q output of the flip-flop V (3c ₆ ) becomes Hi, the operation of the peak detection circuit (3c ₁₁ ) is started, but since the output is Low, the operation of the bottom detection circuit (3c ₁₃ ) remains stopped. is there.

On the other hand, the time-current characteristics when the latching solenoid (4a) to be described later is energized, as shown in FIG. 5, when energization of the operating coil (4a ₁ ) or the return coil (4a ₂ ) is started, the current is applied to the coil. The current rises, and after a certain time, the current once decreases due to the counter electromotive force that accompanies the movement of the plunger (4a ₃ ), but the counter electromotive force is reduced to 0 by opening or closing the valve (4a ₄ ). Therefore, the current will continue to rise after that, and the time required from the start of energization until the current drops once and starts to rise again is at most about 10 ms. I understand.

The peak detection circuit (3c ₁₁ ) follows only high voltage and detects the maximum current value due to the current application to the operating coil (4a ₁ ) and outputs the maximum current value to the peak detection ON comparator (3c ₁₅ ). To do.

The peak detection ON comparator (3c ₁₅ ) compares the current maximum value with the output obtained from the margin adding circuit (3c ₁₂ ) in which a predetermined margin is added to the current waveform when the latching solenoid (4a) is energized. When the output obtained from the circuit (3c ₁₂ ) exceeds the maximum current value and becomes small, the output is output to the clear of the flip-flop (3c ₆ ) at that time.

When the clear of the flip-flop V (3c ₆ ) is input,
When the Q output becomes Low and the operation of the peak detection circuit (3c ₁₁ ) is stopped, the output becomes Hi and the bottom detection circuit (3c ₁₁ )
₁₃ ) Start operation.

The bottom detection circuit (3c ₁₃ ) tracks only low voltage,
When the valve portion (4a ₄ ) is opened, that is, the current minimum value of the counter electromotive force 0 is detected, and the current minimum value is output to the bottom detection ON comparator (3c ₁₆ ).

The bottom detection ON comparator (3c ₁₆ ) compares the minimum current value with the output obtained from the margin subtraction circuit (3c ₁₄ ) obtained by subtracting a predetermined margin from the current waveform when the latching solenoid (4a) is energized. When the output obtained from (3c ₁₄ ) exceeds the current minimum value and becomes large, it is output to clear the flip-flop IV (3c ₅ ) at that time.

When the clear of the flip-flop IV (3c ₅ ) is input, the output becomes Low and the AND circuit (3c ₈ ) changes to the open side AND circuit (3c ₈ ).
Open drive transistor (3c ₉ ) to output Low to c ₁ )
Turns off and stops supplying the drive current I from the battery (5) to the operating coil (4a ₁ ).

Then, a pulse signal is generated from the one-shot pulse circuit (3b ₇ ) by the output from the shift register (3b ₆ ), and this pulse signal causes a flip-flop III (3b ₄ )
When the output from the drive circuit (3c) is switched from Hi to Low, Low is input to one input terminal of the open side AND circuit (3c ₁ ) and to one input terminal of the closed side AND circuit (3c ₃ ). NOT circuit I
Hi is input via (3c ₂ ) and the flip-flop IV V (3c ₅ ) (3c ₆ ) is input from the exclusive OR circuit (3c ₄ ).
And a pulse signal is output to the 50 ms one-shot timer (3c ₇ ).

Thus, the closed side AND circuit (3c ₃₎ both input terminals becomes Hi, Hi output OR circuit II (3c from the closed side AND circuit (3c _3)
It is input to the closing drive transistor (3c ₁₈ ) via the switch ₁₇ ) to turn it on, and is also input to the T ₁ timer (3c ₂₀ ) via the OR circuit III (3c ₁₉ ).

When closing the driving transistor (3c ₁₈₎ is turned ON, the battery (5) a driving current I to start energizing the return coil of the latching solenoid (4a) to be described later (4a ₂₎ from.

After that, similar to the open drive transistor (3c ₉ ) described above, the current maximum value obtained by applying the current to the return coil (4a ₂ ) in the peak detection circuit (3c ₁₁ ) and the margin addition circuit (3c ₁₂ ) The margin addition output obtained from is compared with the peak detection ON comparator (3c ₁₅ ), and when the margin addition output becomes smaller than the current maximum value, the flip-flop V (3c ₆ ) is cleared at that time and the bottom detection is performed. The minimum current value obtained when the valve (4a ₄ ) is closed in the circuit (3c ₁₄ ) and the margin subtraction circuit obtained from the margin subtraction circuit (3c ₁₃ ) are compared by the bottom detection ON comparator (3c ₁₆ ). When the margin subtraction output exceeds the minimum current value and becomes large, the flip-flop IV (3c ₅ ) is cleared at that point and the open drive transistor (3c ₁₈ ) is turned off to recover the battery (5). The supply of the drive current I to the return coil (4a ₂ ) is stopped.

On the other hand, the above T ₁ timer (3c ₂₀ ) is a re-trigger type one-shot timer, and the Hi-value from the closed side AND circuit (3c ₃ )
When the output is input, it starts counting and outputs Hi to NOT circuit II (3c ₂₁ ), and outputs a Low to NOT circuit II (3c ₂₁ ) after T ₁ hour, for example, 1 hour, but T ₁ hour If the Hi output is input from the closed side AND circuit (3c ₃ ) before the time has elapsed, the count is reset to the initial state and a new count is started.

NOT circuit II (3c ₂₁₎ is input from the T ₁ timer (3c ₂₀₎ is Hi
When switching from to Low, it outputs Hi to the T ₂ timer (3c ₂₂ ) and starts it.

The T ₂ timer (3c ₂₂ ) has a conventionally well-known structure and is a one-shot timer in the case of the present embodiment, and is closed for a period of T ₂ time, for example, 20 msec from the start of its operation through the OR circuit II (3c ₁₇ ). Output to the drive transistor (3c ₁₈ ) and return coil (4a
₂ ) is energized for 20 msec, and is also output to the T ₁ timer (3c ₂₀ ) via the NOT circuit III (3c ₂₃ ) and the OR circuit III (3c ₁₉ ), and the output of the T ₂ timer (3c ₂₂ ) is output. When it is gone, start counting again.

Therefore, if the user does not sense the user continuously for T ₁ hours after he / she leaves, the return coil (4a ₂ ) will receive ₂ coils every T ₁ hour.
Energize for 0 msec to close the latching solenoid (4a).

When the open drive transistor (3c ₉ ) or close drive transistor (3c ₁₈ ) is ON, the output from the margin addition circuit (3c ₁₂ ) does not decrease below the maximum current value due to some abnormality. It is possible that the output from the margin subtraction circuit (3c ₁₄ ) does not exceed the current minimum value and is not large. In these cases, there is no input to clear the flip-flop IV (3c ₅ ) and the open / close drive transistor ( When 3c ₉ ) and (3c ₁₈ ) remain ON, the energization from the battery (5) to the operating coil (4a ₁ ) or the return coil (4a ₂ ) is not stopped but is energized and left.

However, even if such an abnormal condition occurs, 50 msec after the output to the drive circuit (3c) switches to Hi or Low.
The m-second one-shot timer (3c ₇ ) times up, the Q output becomes Low, and the output from the AND circuit (3c ₈ ) switches from Hi to Low, so the open drive transistor (3c ₉ ) or close drive transistor (3c ₉ ) 3c ₁₈ ) is turned off and the energization from the battery (5) to the operating coil (4a ₁ ) or the return coil (4a ₂ ) is stopped, and the output becomes Hi, so the output from the NAND circuit (3c ₂₄ ) To Low to notify the user of the abnormal condition by turning on the non-operation lamp (3c ₂₅ ).

A time chart of such a drive circuit (3c) is shown in FIG.

The water supply section (4) is composed of a latching solenoid (4a) shown in FIGS. 7 and 8 and a flash valve (4b) which is opened and closed by the operation of the latching solenoid (4a). A flush valve (4b) is provided in a water supply channel (6a) that connects a water source and a urinal (1a), and a pressure chamber defined in the flush valve (4b) and a secondary side of the flush valve. A latching solenoid (4a) is provided in a branch flow path (6b) that communicates with the.

Latching solenoid (4a) is a metal case (4a ₅ )
A ring-shaped operating coil (4a ₁ ) and a return coil (4a ₂ ) are vertically stacked inside each other, and these coil (4a ₁ ) (4a ₁ ) (4a ₁ ) (4a ₁ )
A permanent magnet (4a ₆ ) is placed in contact with the inner surface of the case (4a ₅ ) between a ₂ ) and the first fixed iron core (4a ₇ ) is returned to the inside of the operating coil (4a ₁ ). Inside the coil (4a ₂ ), the second fixed iron cores (4a ₈ ) are inserted through the upper and lower surfaces of the case (4a ₅ ) and attached.

The inside of the permanent magnets (4a ₆₎ deployed plunger (4a ₃₎ freely move up and down, the plunger (4a ₃ between the plunger (4a ₃₎ upper surface and the first fixed iron core (4a ₇₎ lower surface ) Is always closed, that is, a spring (4a ₉ ) that presses downward is mounted, and the lower surface of the plunger (4a ₃ ) is vertically movably inserted through the second fixed iron core (4a ₈ ). A valve body (4a ₁₀ ) for opening and closing the portion (4a ₄ ) is integrally provided.

The operation of such a latching solenoid (4a) will be described. When the normal user is not detected, the spring (4a ₉ ) elastically presses the plunger (4a ₃ ) downward, so that the valve portion (4a ₄ ) Valve to close the branch channel (6
b) closed, inward from the plunger at this time of the permanent magnets (4a ₆₎ is of magnetic flux magnet _{(4a 6) (4a 3)} , the second fixed iron core (4a _8), through the casing (4a ₅₎ permanently A circulation path that returns to the magnet (4a ₆ ) is formed, and the plunger (4a ₃ ) remains down,
That is, the valve closed state shown in FIG. 7 is maintained.

In this state, when the operating coil (4a ₁ ) is energized, a magnetic flux that tries to attract the plunger (4a ₃ ) upward is generated, and this magnetic flux gradually becomes stronger, for example, the operating coil (4a 1).
_The plunger (4
a ₃ ) starts to move upwards to generate a counter electromotive force, and the valve body (4a ₁₀ ) moves upwards accordingly, so that the valve section (4a ₄ )
Is opened and the back electromotive force becomes zero. When the valve portion (4a ₄ ) is opened, water in the pressure chamber of the flush valve (4b) is discharged to the secondary side of the flush valve (4b) via the branch flow passage (6b).

After that, the plunger (4a ₃ ) continues to move upward, compresses the spring (4a ₉ ) and finally the upper surface of the plunger (4a ₃ ) abuts the lower surface of the first fixed iron core (4a ₇ ).

Inward from the plunger at this time of the permanent magnets (4a ₆₎ is of magnetic flux magnet _{(4a 6) (4a 3)} , the first fixed iron core (4a _7), the case of the permanent magnet through (4a ₅₎ (4a ₆₎ The circulation path returning to the outside is formed, and the plunger (4a ₃ ) remains attracted to the first fixed iron core (4a ₇ ), that is, the valve open state shown in FIG. 8 is maintained.

When the return coil (4a ₂ ) is energized to close the valve again from this open state, a magnetic flux is generated that tries to attract the plunger (4a ₃ ) downward, and this magnetic flux gradually becomes stronger. For example, about 1 after starting to energize the return coil (4a ₂ )
Within 0 ms, the elastic force of the spring (4a ₉ ) begins to move down the plunger (4a ₃ ) to generate a counter electromotive force,
Along with that, the valve body (4a ₁₀ ) moves downward, the valve portion (4a ₄ ) closes, and the electromotive force becomes zero. When the valve portion (4a ₄ ) opens, the outflow of water from the pressure chamber of the flush valve (4b) is stopped.

The flash valve (4b) has a conventionally well-known structure, and forms a pressure chamber behind the main valve body that is movably provided therein, and when the water in the pressure chamber decreases, the main valve body will When the flush water from the water supply source is supplied to the urinal (1a) through the water supply channel (6a) and the outflow of water from the pressure chamber is stopped, Water gradually begins to flow into the pressure chamber through the small passage opened in the main valve body, and the main valve body gradually moves in the valve closing direction to finally close the valve, and the urinal (1a ) To stop the water supply to.

In the embodiment shown above, the flushing device (1) is the urinal (1a).
However, the present invention is not limited to this, and the water washing device (1) may be a hand washing device (1b) as shown in FIG. 9, for example.

In this case, the sensing unit (2) is provided on the wall surface (W) on the rear upper surface of the hand washing unit (1b), and the sensing unit (2) detects the user approaching the hand washing unit (1b) for hand washing. then, by energizing the water supply unit (4) to start the water supply from the water discharge device (1b _1), and is adapted to stop the water supply and from the user leaves restroom after wash unit (1b).

Further, in the embodiment shown above, the sensing unit (2) is attached to the wall surface (W).
However, the mounting structure of the sensing unit (2) is not limited to that shown in the figure, and a latching solenoid is used as the solenoid. A solenoid may be used.

<Effects of the Invention> The present invention having the above-described configuration has the following advantages.

When the user walks away and a closing signal is output to the latching solenoid, the timer is started.When the user senses the user before the timer expires and a closing signal is output to the latching solenoid, the timer is initialized. Back,
When the timer does not detect the user before the time expires, the valve closing signal is output to the latching solenoid, the timer is restarted, and the valve closing signal is output every time the timer expires. The latching solenoid opens while the valve is closed due to sudden vibrations or rapid changes in water pressure similar to a water hammer, and even if the user does not use it for a long time, it can be automatically closed. As a result, the wash water does not flow into the washer for a long time.

[Brief description of drawings]

FIG. 1 is a vertical side view of a water supply control device showing an embodiment of the present invention, FIG. 2 is a block diagram of a sensor circuit and a control circuit, FIG. 3 is the same time chart, and FIG. 4 is a block diagram of a drive circuit. FIG. 5 is a graph showing time-current characteristics when the latching solenoid is energized, FIG. 6 is a time chart of the drive circuit, and FIG. 7 is an enlarged vertical cross-sectional view of the latching solenoid showing the valve closed state of the valve portion. FIG. 8 is an enlarged vertical sectional view of the latching solenoid showing the valve opening state,
The figure is a partially cutaway front view showing a case where the water washing device is a hand washing device. 1 ... Washer, 2 ... Sensing part 3 ... Control part, 3c ₂₀ ... Timer 4 ... Water supply part, 4a ... Latching solenoid 5 ... Battery

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-203747 (JP, A) JP-A-60-26735 (JP, A)

Claims (2)

[Claims] 1. A flusher, a sensing unit for sensing the use of the flusher, a control unit for outputting an opening / closing signal to a water supply unit based on a sensing signal from the sensing unit, and an opening / closing signal from the control unit. In a water supply control device including a water supply unit that opens and closes a valve, the water supply unit opens the valve in response to a valve opening signal from the control unit to maintain an open state, and closes the valve in response to a valve closing signal to close the valve. It is composed of a solenoid to be maintained, and when the control unit outputs a valve closing signal to the solenoid based on the sensing signal from the sensing unit, the solenoid is closed when the valve closing signal based on the sensing signal is not output for a predetermined time. A water supply control device having a timer for outputting a signal, wherein the timer outputs a valve closing signal every time a predetermined time elapses unless a valve closing signal based on the sensing signal is output thereafter. 2. The water supply control device according to claim 1, wherein the drive power source is a battery, and the water supply unit is a latching solenoid that stops energization to the water supply unit while the valve is open.