JP6351380B2 - Water supply control device - Google Patents

Description

  The present invention relates to a water supply control device. Specifically, the present invention relates to a water supply control device used for an automatic faucet or the like.

  Conventionally, automatic faucets are widely used in kitchens and washstands. In this automatic faucet, a water supply control device is usually used that includes an electromagnetic valve installed in a water supply channel connected to a water outlet and a control unit that outputs a control signal to the electromagnetic valve and controls the opening and closing of the electromagnetic valve. Under the control of the control unit, the solenoid valve opens and closes the water supply channel, and water supply to the water outlet and water stoppage are switched.

In such an automatic faucet, the solenoid valve may not open or close even if a valve opening signal or a valve closing signal is output from the control unit due to foreign matter biting into the solenoid valve, etc. A technique for coping with the occurrence of the opening / closing failure of the electromagnetic valve has also been proposed (see, for example, Patent Document 1).
In the technique of Patent Document 1, a generator is installed in a water supply channel, and after a valve opening signal or a valve closing signal is output to an electromagnetic valve, the presence or absence of power generation by the generator is detected. When it is detected that the electromagnetic valve is not opened or closed based on the presence or absence of this power generation, the valve opening signal or the valve closing signal is output again, and the electromagnetic valve is controlled to open or close.

No. 06-16177

By the way, a phenomenon called water hammer (water hammer action) is known in which when the water flow in the water pressure pipe is suddenly stopped, an impact and a high water pressure are generated in the water pressure pipe due to the inertia of the water.
If high water pressure by a water hammer acts on the solenoid valve of the automatic faucet in the water supply control device as described above, the valve will open without being maintained even in the closed state, and will return to the closed state as it is. Inadvertently, water may continue to flow out unnecessarily. However, no practical technical means for dealing with such problems has been proposed yet.

  The present invention has been made in view of the above, and its purpose is to automatically return to the closed state again even if the faucet that should be in the closed state is inadvertently turned to the open state by a water hammer or the like. An object of the present invention is to provide a water supply control device.

(1) An electromagnetic valve (for example, an electromagnetic valve 20 to be described later) installed in a water supply path (for example, an after-mentioned water supply path 107), and a water discharge detection unit (for example, to be described later) that detects water flow downstream of the electromagnetic valve. A generator 50 and a power generation detection circuit 71), and a control unit (for example, a control unit 79 to be described later) that outputs a control signal to the electromagnetic valve and controls opening and closing of the electromagnetic valve. A water supply that outputs a valve closing signal when water discharge is detected by the water discharge detection unit after outputting a valve closing signal to the solenoid valve and before outputting a valve opening signal next time Control device.

(2) The solenoid valve has a plunger (for example, a plunger 23 described later), and the plunger is opposed to and partially abuts a fixed member (for example, a fixed core 29 described later) at a predetermined end point position in the operation region. It is preferable that at least a part of its own end surface (for example, an end surface 231 described later) is formed in a non-planar shape (for example, a substantially spherical shape in which a peripheral portion is rounded as described later).

  According to the present invention, there is realized a water supply control device that automatically returns to a closed state again even when a faucet that should be in a closed state is inadvertently turned into a valve open state by a water hammer or the like.

It is a block diagram of the automatic water tap with which the water supply control apparatus which concerns on one Embodiment of this invention is used. It is a functional block diagram which shows the structure of the water supply control apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the state which the valve part of the solenoid valve of the water supply control apparatus which concerns on one Embodiment of this invention is open. It is sectional drawing which shows the state which the valve part of the solenoid valve of the water supply control apparatus which concerns on one Embodiment of this invention is closing. It is a time chart showing operation | movement of the water supply control apparatus which concerns on one Embodiment of this invention. It is a flowchart showing the process sequence of solenoid valve opening / closing control in the water supply control apparatus which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram of an automatic faucet 100 in which a water supply control device 10 according to an embodiment of the present invention is used.

  The water discharge pipe 101 is fixed to the upper surface side of the counter 103 of the washstand. The tip of the water discharge pipe 101 forms a water discharge port 105. Water discharged from the water outlet 105 through the water discharge pipe 101 is supplied through the water supply passage 107. The upstream side of the water supply channel 107 is connected to the water supply 108, and the water supply from the water supply 108 is guided to the water discharge pipe 101.

  The water supply control device 10 performs switching control between water supply and water stop to the water discharge port 105 of the water discharge pipe 101 in the automatic water faucet 100. The water supply control device 10 includes a solenoid valve 20, a generator 50, an object detection sensor 60, and a control unit 70.

  The electromagnetic valve 20 is installed at an appropriate place in the water supply passage 107. As will be described later, the solenoid valve 20 switches between water supply and water stop to the downstream side of the water supply passage 107, and consequently switches both the water supply and water stop states to the water outlet 105. (It is controlled by the control unit 79 described later).

  The generator 50 is installed on the downstream side of the electromagnetic valve 20 in the water supply passage 107. The generator 50 has a water wheel (not shown) that is driven to rotate by running water in the water supply channel 107. This water turbine rotates when the running water in the water supply channel 107 hits its blades. In the generator 50, the magnet and the coil are relatively rotated by the rotation of the water turbine as described above, and an electromotive force is generated in the coil by electromagnetic induction to generate power.

  The object detection sensor 60 is an infrared distance measuring sensor having a light emitting part and a light receiving part, and is attached to the vicinity of the water outlet 105 of the water discharge pipe 101. The object detection sensor 60 projects light from the light emitting unit, and receives light reflected from the detected object such as a human hand by the projected light by the light receiving unit, thereby detecting the object in the predetermined detection region. Detect the presence or absence. The object detection sensor 60 outputs a signal indicating the detection result of the detected object to the control unit 79 (described later).

  FIG. 2 is a functional block diagram showing the configuration of the water supply control device 10 according to one embodiment of the present invention. The control unit 70 controls the operation of the electromagnetic valve 20 based on the detection output signal from the object detection sensor 60 and the electromotive force from the generator 50. The control unit 70 includes a power generation detection circuit 71, a power supply unit 73, and a control unit 79.

The power generation detection circuit 71 detects the presence or absence of electromotive force from the generator 50. The power generation detection circuit 71 outputs a signal to the control unit 79 when an electromotive force is generated by the generator 50, and does not output a signal to the control unit 79 when there is no electromotive force generated by the generator 50. The power generation detection circuit 71 includes a waveform shaping circuit that shapes the output waveform from the rectifier circuit that rectifies the alternating current generated by the electromotive force of the generator 50 into a rectangular wave and outputs the rectangular waveform to the control unit 79.
The generator 50 and the power generation detection circuit 71 as described above constitute a water discharge detection unit that detects water flow downstream of the electromagnetic valve 20.

  The power supply unit 73 supplies operating power to each of the control unit 79, the object detection sensor 60, and the electromagnetic valve 20. The power supply unit 73 includes a power storage unit 75 and a backup battery 77. The power storage unit 75 is a capacitor, but may be configured by a secondary battery or the like. The power storage unit 75 stores power by rectifying the alternating current output from the generator 50 by a full-wave rectifier circuit or the like. The control unit 79, the object detection sensor 60, and the electromagnetic valve 20 use the power storage unit 75 in the power supply unit 73 as a main power source. The backup battery 77 is a dry battery, but is not limited to this. The backup battery 77 supplies operating power to each of the control unit 79, the object detection sensor 60, and the electromagnetic valve 20 when the voltage of the power storage unit 75 becomes a predetermined value or less.

  The control unit 79 includes a microcomputer. The control unit 79 outputs a control signal to the electromagnetic valve 20 based on the output signal from the object detection sensor 60 to control the opening / closing of the electromagnetic valve 20. The control unit 79 may be configured to include a storage unit that holds a control algorithm.

  3 shows a state where the valve portion 21 of the electromagnetic valve 20 is open, and FIG. 4 shows a state where the valve portion 21 is closed. The solenoid valve 20 is a latch type solenoid valve. The electromagnetic valve 20 includes a moving body 26, a permanent magnet 27, a fixed core 29, a coil 31, a spring 33, a ring body 35, and a housing 37. As will be described in detail, the latch electromagnetic valve moves the moving body 26 by energizing the coil 31, opens and closes the water supply passage 107 by opening and closing the valve portion 21 by moving the moving body 26, and magnetizes the permanent magnet 27. The movable body 26 is configured to be held at either the valve opening position or the valve closing position by the action of the fixed core 29 and the spring 33 that are formed.

  The moving body 26 includes a plunger 23 and a valve body 25. The plunger 23 is held in an accommodating portion 37 a provided in the housing 37 so as to be capable of reciprocating in the axial direction (vertical direction in the figure). The valve body 25 is provided at the distal end portion (lower end side in the drawing) of the plunger 23. The electromagnetic valve 20, specifically the valve chamber 109, is provided so as to be inserted into the water supply passage 107. A valve body 25 is disposed in the valve chamber 109.

  In the valve chamber 109, an inlet 109a connected to the upstream side of the water supply channel 107 and an outlet 109b connected to the downstream side of the water supply channel 107 are formed, and a valve seat 111 is provided at the peripheral portion of the inlet 109a. The valve body 25 contacts and separates from the valve seat 111 to open and close the valve portion 21. The valve body 25 is provided with an elastic portion 25a formed of an elastic member such as rubber at a position where the valve body 25 is in contact with and separated from the valve seat 111.

  The permanent magnet 27 is disposed coaxially with the plunger 23. The fixed core 29 is disposed between the permanent magnet 27 and the plunger 23. The fixed core 29 is magnetized by the permanent magnet 27 and attracts the plunger 23 by its attractive force. The coil 31 is disposed so as to surround the plunger 23. The spring 33 is inserted between the fixed core 29 and the plunger 23 and biases the plunger 23 in the valve closing direction (downward in the figure). The ring body 35 is disposed below the coil 31. The housing 37 is formed in a cup shape and houses the plunger 23 and the like.

  When the moving body 26 is in the valve opening position where the end surface 231 of the plunger 23 is in contact with the fixed core 29, the plunger 23 is attracted to the fixed core 29 by the magnetic force of the permanent magnet 27 and is held in the valve opening position. On the other hand, the movable body 26 is held in the closed position by the urging force of the spring 33 when the elastic portion 25a of the valve body 25 is in the closed position where it contacts the valve seat 111. The water supply channel 107 is opened when the moving body 26 is in the valve opening position, and is closed when the moving body 26 is in the valve closing position.

  In the electromagnetic valve 20, a magnetic path is formed from the permanent magnet 27 to the permanent magnet 27 through the fixed core 29, the plunger 23, the ring body 35, and the housing 37 when the coil 31 is not energized.

  When moving the moving body 26 of the electromagnetic valve 20 from the open position to the closed position, a coil is generated so that a magnetic flux in a direction opposite to the flow direction of the magnetic flux flowing in the magnetic path (hereinafter referred to as the forward direction A) is generated. 31 is energized. As a result, the suction force of the fixed core 29 with respect to the plunger 23 is weakened, and the urging force of the spring 33 becomes larger than this suction force. The urging force moves the moving body 26 from the valve opening position and stops at the valve closing position. At this time, since the distance between the plunger 23 and the fixed core 29 is large, the attractive force of the fixed core 29 becomes weak, and even if the energization to the coil 31 is stopped, the urging force of the spring 33 is larger than the attractive force of the fixed core 29. The moving body 26 is stably held at the valve closing position.

  On the other hand, when the coil 31 is energized so as to generate a magnetic flux in a direction opposite to the forward direction A, the attractive force of the fixed core 29 against the plunger 23 is increased, and the attractive force of the fixed core 29 is greater than the urging force of the spring 33. The moving body 26 moves from the valve closing position by this suction force and stops at the valve opening position. At this time, since the distance between the plunger 23 and the fixed core 29 is small, the attractive force of the fixed core 29 becomes strong, and even if the energization to the coil 31 is stopped, the attractive force of the fixed core 29 remains larger than the urging force of the spring 33. Thus, the moving body 26 is stably held at the valve opening position. As described above, the moving body 26 of the electromagnetic valve 20 is stably held at any of the two positions of the valve closing position and the valve opening position.

When moving the moving body 26 from the valve opening position to the valve closing position, the control unit 79 outputs a valve closing signal as a control signal for closing the electromagnetic valve 20. When receiving the valve closing signal, the solenoid valve 20 is excited so that a magnetic flux having a flow in the positive direction A is generated in the coil 31.
On the other hand, when moving the moving body 26 from the valve closing position to the valve opening position, the control unit 79 outputs a valve opening signal as a control signal for opening the electromagnetic valve 20. When receiving the valve opening signal, the electromagnetic valve 20 is excited so that a magnetic flux having a flow in the direction opposite to the positive direction A is generated in the coil 31.

  Here, in this embodiment, in particular, the plunger 23 of the moving body 26 is a portion facing the fixed core 29 that is a fixed member at the end point position (upper end position in FIG. 3) in the operation region of the up and down reciprocating movement in the drawing. The end surface 231 (upper end surface) that comes into contact with each other is formed into a non-planar shape. That is, as can be easily understood from FIGS. 3 and 4, the end surface 231 is formed in a substantially spherical shape having a rounded chamfered peripheral edge portion.

Since the end surface 231 with which the plunger 23 abuts on the fixed core 29 is formed in such a non-planar shape, the end surface 231 of the plunger 23 and the fixed core 29 are not easily separated from each other once the flat surfaces are brought into close contact with each other. It is possible to minimize the possibility that the solenoid valve will become difficult to operate and malfunction as a solenoid valve.
Here, the non-planar shape is not limited to the substantially spherical shape as described above. That is, it may have various shapes such as a shape in which a portion or the entire surface is curved, or a shape in which irregularities are formed, so that it does not adhere to the flat contact surface on the fixing member side. .

  When the electromagnetic valve 20 is in the closed state as shown in FIG. 4, if a high water pressure caused by a water hammer or the like generated for some reason in the water supply channel 107 propagates to the inlet 109 a of the valve portion 21, the valve portion 21. May open without being able to maintain a closed state.

  That is, although the valve opening signal is not issued from the control unit 79, the valve unit 21 is turned to open by high water pressure by a water hammer or the like, and the moving body 26 is moved upward by the water pressure acting on the valve body 25. And is stabilized at this position. This is because the distance between the plunger 23 and the fixed core 29 is reduced due to the upward displacement of the valve body 25 so that the suction force of the fixed core 29 is superior to the pressing force of the spring 33, and the moving body 26 is brought to the valve open position. This is because it is retained. Once in such a state, if no measures are taken, the solenoid valve 20 cannot automatically return to the closed state, and wasteful flowing water continues from the discharge port 105. A failure will occur.

  Therefore, in the apparatus of the present embodiment, even if the electromagnetic valve 20 that should maintain the closed state is once turned to the open state by a water hammer or the like, the electromagnetic valve 20 is automatically returned to the closed state. It is configured to be able to.

FIG. 5 is a time chart showing the operation of the water supply control device of this embodiment.
In FIG. 5, in order from the top, the output signal of the object detection sensor 60, the valve opening signal that is the output of the control unit 79, the output signal of the power generation detection circuit 71, and the valve closing signal that is the output of the control unit 79, A time axis common to the above signals is shown on the bottom line.

At time t1, when a user's hand approaches the vicinity of the discharge port 105 of the automatic faucet 100 and enters the detection region of the object detection sensor 60, the output signal of the object detection sensor 60 turns on. In response to the output signal of the object detection sensor 60 turning on, a valve opening signal is issued from the control unit 79. The electromagnetic valve 20 turns into the valve open state at time t2 by the valve opening signal generated as described above.
Since the solenoid valve 20 is of a latch type as described above, this state is maintained once the valve valve is opened. When the solenoid valve 20 turns to the valve open state, the generator 50 is activated by water flow in the water supply passage 107, and the output of the generator is shaped by the power generation detection circuit 71, and a pulse train signal is generated from the power generation detection circuit 71. .

  A pulse train signal (intermittent pulse signal) that is an output signal of the power generation detection circuit 71 corresponding to the output of the generator 50 is output over the duration of water flow. That is, water discharge continues from the water discharge port 105 over the continuous period, and the user can use the hand for washing.

  Next, when the user moves his hand away from the detection area of the object detection sensor 60 at time t3, the output signal of the object detection sensor 60 turns off. In response to the output signal of the object detection sensor 60 turning off, the control unit 79 issues a valve closing signal to the electromagnetic valve 20. The electromagnetic valve 20 is turned to the closed state by the valve closing signal generated as described above. Thereafter, normally, unless the output signal of the object detection sensor 60 is turned on next and the valve opening signal is output, the valve closed state is normally output. Is maintained.

  When the solenoid valve turns to the closed state, the water flow in the water supply passage 107 stops and the generator 50 stops operating, and the pulse train signal, which is the output signal of the power generation detection circuit 71 corresponding to the output of the generator 50, is generated. Stop. There is a slight time difference from when the solenoid valve starts to close until the water flow in the water supply channel 107 stops, but here, the water flow stops at time t4 slightly delayed from the above-described time t3, It is assumed that generation of a pulse train signal that is an output of the power generation detection circuit 71 corresponding to the output of the generator 50 stops.

In the description with reference to FIG. 5, for the sake of convenience, the timing at which the output signal of the object detection sensor 60 turns on and the timing at which the valve opening signal is issued from the control unit 79 are both shown as time t1. ing. More precisely, the timing at which the valve opening signal is issued is somewhat delayed from the time t1 when the output signal of the object detection sensor 60 turns on.
Similarly, the timing at which the output signal of the object detection sensor 60 turns off and the timing at which the valve closing signal is generated from the control unit 79 are both shown as time t3. Strictly speaking, the timing at which the valve closing signal is generated is somewhat delayed from the time t3 when the output of the object detection sensor 60 turns off.

  The water hammer stops at time t5 when some passage of time has elapsed since the stop of water flow at time t4 and the generation of the pulse train signal that is the output of the power generation detection circuit 71 corresponding to the output of the generator 50 has stopped. If the solenoid valve 20 is turned to the open state due to high water pressure due to the water pressure, etc., the water supply passage 107 begins to flow even though the valve open signal is OFF, and the generator 50 is activated to A pulse signal that is an output signal of the power generation detection circuit 71 corresponding to the output of 50 is generated.

  In the apparatus of this embodiment, after the valve closing signal is once issued, the pulse signal which is the output signal of the power generation detection circuit 71 corresponding to the output of the generator 50 is generated even though the valve opening signal is still off. When generated, the control unit 79 issues a valve closing signal to the electromagnetic valve 20. The electromagnetic valve 20 is turned to the closed state by the valve closing signal generated as described above, the water flow through the water supply passage 107 is stopped, the generator 50 is stopped, and the power generation detection corresponding to the output of the generator 50 is performed. The pulse signal that is the output signal of the circuit 71 is also not output.

  In this case as well, there is a slight time difference from when the electromagnetic valve starts to be closed until the water flow in the water supply channel 107 stops, but here, the water flow is performed at time t6 slightly delayed from the above-described time t5. Is stopped, and generation of a pulse signal that is an output signal of the power generation detection circuit 71 corresponding to the output of the generator 50 is stopped.

  FIG. 6 is a flowchart showing a processing procedure of opening / closing control of the electromagnetic valve 20 in the control unit 79 of the water supply control device 10. Here, the flow of processing from the time when the automatic faucet 100 provided with the water supply control device 10 of the present embodiment is waiting for use by the user is illustrated.

When the operation of the control unit 79 is started, the user's hand or the like of the automatic faucet 100 provided with the water supply control device 10 waits for the user to approach the spout 105 and enter the detection area of the object detection sensor 60 ( Step S601: No).
When the user's hand or the like approaches the spout 105 and enters the detection area of the object detection sensor 60, the output signal of the object detection sensor 60 is turned on and detected (step S601: Yes).
When it is detected in step S601 that the output signal of the object detection sensor 60 is turned on, in response to this detection, the valve opening signal for the electromagnetic valve 20 is turned on (step S602).

  When the valve opening signal for the electromagnetic valve 20 is turned on in step S602, the electromagnetic valve 20 is excited to a polarity that generates a magnetic force in the direction in which the coil 31 contributes to the valve opening (the direction opposite to the above-described positive direction A). The valve 20 opens. When the solenoid valve 20 is opened, water discharges from the water outlet 105 of the water discharge pipe 101, and the user can perform hand washing with running water.

When the electromagnetic valve 20 is opened in the process of step S602, the process waits for the user's hand or the like to move out of the detection area of the object detection sensor 60. That is, it waits for the output signal of the object detection sensor 60 to be turned off (step S603: No).
When it is detected that the output signal of the object detection sensor 60 is turned off (step S603: Yes), the valve closing signal for the electromagnetic valve 20 is then turned on (step S604).

  When the valve closing signal for the electromagnetic valve 20 is turned on in step S604, the electromagnetic valve 20 is excited to a polarity that generates a magnetic force in the direction in which the coil 31 contributes to the valve closing (the positive direction A described above), and the electromagnetic valve 20 is closed. I speak. When the solenoid valve 20 is closed, water discharge from the water discharge port 105 of the water discharge pipe 101 is stopped.

  In the present embodiment, even after the electromagnetic valve 20 is closed by the process of step S604, it is continuously monitored whether the running water in the water supply channel 107 is stopped based on the output signal of the power generation detection circuit 71. (Step S605: No). If the closed state of the electromagnetic valve 20 is maintained and the flowing water is stopped, the output signal of the power generation detection circuit 71 maintains the off level.

When it is detected that the output signal of the power generation detection circuit 71 is generated in step S605 while continuously monitoring whether running water in the water supply channel 107 is stopped (step S605: Yes), this It is determined whether or not there is a history that the valve opening signal has been issued in the most recent past from the time when the generation of the output signal is detected (step S606). Here, the most recent past means a period between time t4 and time t5 when the current time is time t5 (time when the output signal of the power generation detection circuit 71 is generated) in the time chart of FIG. To do. That is, it is a period from when the valve closing signal is issued to the last time until the present time.
Note that in the time series processing up to step S606, it is natural to determine whether or not the valve opening signal is generated at the time of step S606, and whether there is a history that the valve opening signal has been issued in the most recent past. It will be determined whether or not.

  If it is determined in step S606 that there is no history of valve opening signals issued in the past past from the time when the output signal of the power generation detection circuit 71 was detected (step S606: No), the solenoid valve 20 is immediately used. Is turned on (step S607), and the electromagnetic valve 20 is closed. When it is determined in step S606 that there is a history that the valve opening signal has been issued (step S606: Yes), the process returns to step S601.

  In the process from step S605 (Yes) → step S606 (No) → step S607, the valve unit 21 is in the open state due to the high water pressure by a water hammer or the like even though the valve opening signal is not issued from the control unit 79. When inadvertent water discharge occurs in response to this, the generation is detected and the electromagnetic valve 20 is automatically closed. By this treatment, it is possible to effectively prevent the generation of useless flowing water.

According to this embodiment, the following effects are produced.
In the present embodiment, when the electromagnetic valve 20 that should maintain the valve-closed state is temporarily opened by a water hammer or the like and the flowing water is generated, this flowing water state is detected based on the output signal of the power generation detection circuit 71. . When it is determined that there is no history of the valve opening signal being issued in the past past from the time when the output signal of the power generation detection circuit 71 was detected, the valve closing signal is issued and the electromagnetic valve 20 is closed. Let

  For this reason, according to the present embodiment, even if the electromagnetic valve 20 is inadvertently turned to the open state by a water hammer or the like and a slight amount of flowing water is generated, this flowing water is detected and the electromagnetic valve 20 is quickly activated. The valve can be automatically returned to the closed state.

  The electromagnetic valve 20 applied to the present embodiment is a latch type electromagnetic valve in which the plunger 23 is stable at both end positions (upper and lower positions in FIGS. 3 and 4) in the reciprocating operation region. . The plunger 23 has a non-planar end surface 231 (the upper end surface in FIGS. 3 and 4) that contacts the fixed core 29 that is a fixing member on the upper end position side. That is, the end surface 231 is formed in a substantially spherical shape having a rounded chamfered peripheral edge portion.

  Since the end surface 231 with which the plunger 23 abuts on the fixed core 29 is formed in such a non-planar shape, the end surface 231 of the plunger 23 and the fixed core 29 are not easily separated from each other once the flat surfaces are brought into close contact with each other. It is possible to minimize the possibility that the solenoid valve will become difficult to operate and malfunction as a solenoid valve.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in the water supply control device described above, the water discharge detection unit is configured by the generator 50 and the power generation detection circuit 71. Instead, a flow meter (for example, a turbine flow meter) or a pressure sensor (for example, moderate accuracy). The water discharge detector may be configured by a water pressure sensor.

  Moreover, if the control part 79 of a water supply control apparatus is comprised in the aspect of PLC (programmable logic controller), a control algorithm and an operation timing can be changed flexibly after operation of a water supply control apparatus, or a plurality of automatic water taps may be installed. Centralized management is easy.

  Further, the shape of the end surface 231 of the plunger 23 is not limited to a non-planar shape in a substantially spherical shape in which the peripheral portion is rounded and chamfered as in the above example. It may be non-planar in a form in which one or a plurality of convex portions are formed. Also in this case, similarly to the above-described example, it is difficult to separate the end face 231 of the plunger 23 from the fixed core 29, and the risk of malfunction as a solenoid valve can be minimized.

  Furthermore, in the above description, the case where the solenoid valve is a latch type has been described in detail. However, the solenoid valve applicable to the present invention is not limited to the latch type solenoid valve, and may be a continuous energization type solenoid valve.

DESCRIPTION OF SYMBOLS 10 ... Water supply control apparatus 20 ... Solenoid valve 21 ... Valve part 23 ... Plunger 26 ... Moving body 27 ... Permanent magnet 29 ... Fixed core 33 ... Spring 50 ... Generator 60 ... Object detection sensor 71 ... Power generation detection circuit 79 ... Control part 100 ... automatic faucet 101 ... spout pipe 105 ... spout 107 ... water supply channel 231 ... end face

Claims (2)

A solenoid valve installed in the water supply channel;
A water discharge detector for detecting water flow downstream of the solenoid valve;
A control unit that outputs a control signal to the solenoid valve and controls opening and closing of the solenoid valve, and
Wherein, after outputting a closing signal to the solenoid valve, when the water discharge is detected by the pre-Symbol water discharge detection unit, the last opening signal in the past from the time when the water discharge is detected When it is determined that there is no history of the occurrence of water, the solenoid valve is closed by outputting a valve closing signal to the solenoid valve . The solenoid valve has a plunger;
2. The water supply control device according to claim 1, wherein at least a part of the end surface of the plunger facing the fixing member and partially abutting at a predetermined end point position of the operation region is formed in a non-planar shape.

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