JPH0625432B2 - Flash valve controller - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flush valve controller that controls opening / closing of a bypass passage of a flush valve in a flush toilet, for example.

[Prior art]

FIG. 4 is a configuration diagram showing a conventional flash valve device, 11 is a pressure chamber of the flash valve 13, 12 is a side passage connecting the pressure chamber 11 and the lower discharge chamber 14 via a solenoid valve 9A, 15 Is an inflow pipe, 16 is a valve port, 17 is a piston valve for opening and closing the valve port 16, and 18 is a throttle channel provided in the piston valve 17 and communicating with the pressure chamber 11. Next, the operation will be described. Now, when the solenoid valve 9A is changed from the illustrated closed state to the open state,
The pressure chamber 11 and the discharge chamber 14 communicate with each other through the side passage 12.
For this reason, the internal pressure of the pressure chamber 11 decreases, whereby the piston valve 17 is pushed upward and the valve port 16 is opened, and the water in the inflow pipe 15 flows through the discharge chamber 14 to the main flow path 20 and the toilet side. Here, when the solenoid valve 9A is closed, water gradually flows into the pressure chamber 11 through the throttle channel 18, so that the piston valve 17 descends by its own weight, the valve port 16 is closed, and the water to the main channel 20 is closed. To stop the spill. By the way, in such a conventional flash valve device, a direct current latch type solenoid valve is used as the solenoid valve 9A,
A flash valve controller that automatically opens this when the power is turned on and when a human body approaches is detected, and that automatically closes after the human body is retracted is widely adopted.

[Problems to be Solved by the Invention]

Since the conventional flash valve device and flash valve controller are configured as described above, the electromagnetic valve 9A is left open during the period from the time when the power is turned on until the human body approaches, and water continues to flow and the human body approaches as well. Even if there is a power outage while water is flowing, there is a problem in that water is likewise discharged. The present invention has been made to solve the above problems, and prevents the direct current latch type solenoid valve from maintaining an open state when the power is turned on or off, so that unnecessary water can be prevented. The purpose is to obtain a flash valve controller capable of preventing dripping.

[Means for Solving the Problems]

A flash valve controller according to the present invention obtains a smoothed DC voltage from an AC power supply by a rectifying / smoothing circuit, outputs an open signal from a microcomputer when the AC power supply is turned on, and then outputs a close signal after a predetermined time. In addition, if the AC power supply is shut off while the open signal is being output, the close signal is forcibly output, and the drive circuit operates according to the open signal and the close signal. The DC latch type solenoid valve is controlled to open and close.

[Work]

The microcomputer according to the present invention outputs an open signal once when the power is turned on, then outputs a close signal after, for example, several seconds, and further detects the voltage drop across the smoothing capacitor when the power is shut off, forcing the closed signal. Then, by the DC latch type solenoid valve optimum control at the time of power-on or power-off as described above, the drainage of water from the flash valve is prevented and the water-saving effect is enhanced.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a transformer that drops AC 100V of a commercial power supply to a predetermined low voltage, 2 is a rectifier connected to the secondary side of this transformer, 3 is a smoothing capacitor connected to this rectifier 2, and rectifier 2 The smoothing capacitor 3 constitutes a rectifying and smoothing circuit. Reference numeral 4 is a three-terminal regulator connected to the smoothing capacitor 3, 5 is a voltage monitoring circuit, 6 is a reset circuit, and 7 is a microcomputer, which outputs a closed signal after a fixed time after outputting an open signal when the power supply voltage rises. At the same time, if the power supply is cut off during the output of the open signal, the voltage drop of the smoothing capacitor 3 is detected and the close signal is forcibly output. Reference numeral 8 denotes a drive circuit which receives the open signal and the close signal of the microcomputer 7 and drives the DC latch solenoid valve 9 to open and close. Reference numeral 10 is a human body detection sensor, the output of which is input to the microcomputer 7. Next, the operation will be described with reference to the timing chart of the signals of the respective parts of the circuit shown in FIG. First, the voltage stepped down by the transformer 1 is rectified by the rectifier 2, smoothed by the smoothing capacitor 3, and further DC-stabilized by the three-terminal regulator 4 to apply the voltage to the reset circuit 6 and the voltage monitoring circuit 5. Supply. Therefore, the voltage is supplied to the microcomputer 7 as a power source. The voltage monitoring circuit 5 receives the voltage directly from the smoothing capacitor 3. Now, the output β of the three-terminal regulator 4 obtained from the input α is monitored by the reset circuit 6, and the reset terminal b is held at “Lo” until it becomes a voltage at which the microcomputer 7 can operate. When the above is reached, the reset terminal b is set to "Hi",
The microcomputer 7 is activated. On the other hand, the input α is monitored by the voltage monitoring circuit 5, and when the power is cut off, the low level signal “Lo” is output to the port a of the microcomputer 7 before the output β of the three-terminal regulator 4 becomes lower than the DC power supply Vcc. To be done. In addition, the drive circuit 8 includes ports c and d of the microcomputer 7.
When the port c is set to the open signal “Hi” and the port d is set to the low level signal “Lo”, the drive circuit 8 is connected.
An open current is output between the ports e and f. On the other hand, port c
When the closed signal is "Lo" and the port d is "Hi", a closed current is output between the ports e and f. FIG. 3 is a flow chart showing details of the control operation of the solenoid valve 9 when the microcomputer 7 is turned on and off. Explaining this, when the voltage of the port b of the microcomputer 7 becomes "Hi", the port c becomes "Hi" and the port d becomes "Lo".
Therefore, the drive circuit 8 supplies an open current to the solenoid valve 9 (step ST1). Next, it is determined whether or not this state continues for 20 msec (step ST2), and if it continues, the ports c and d are set to "Lo" (step ST3). Thus, when it is detected that another 2 seconds have elapsed (step ST4), the port c becomes "Lo" and the port d becomes "Hi" (step ST5), and this state is 20 mse.
c It is determined whether or not it has continued (step ST6). If the result of this determination is that it continues, then both port c and port d are set to "Lo" (step ST7). That is, when the power is turned on, the solenoid valve 9 is once opened, and after 2 seconds, the solenoid valve 9 is automatically closed to prevent water from dripping from the flash valve. Thereafter, the solenoid valve control for the normal water washing operation is executed according to the preset main program (step ST8). When the power is cut off due to a power failure or the like, the port a is set to "Lo" before the output β of the three-terminal regulator falls below the current power supply voltage Vcc. Thus, when the port a becomes "Lo" (step ST9), the port c is "Lo" and the port d is "Hi".
Then (step ST10), a closing current is caused to flow between the ports e and f of the drive circuit 8. Thus, 20
When msec has elapsed (step ST11), both port c and port d are set to "Lo" (step ST11).
12) Prevent water from dripping from the flash valve when the power is cut off, and finish the process.

【The invention's effect】

As described above, according to the present invention, the microcomputer causes the first open signal to be output when the AC power is turned on, then outputs the close signal, and when the power is shut off during the output of the open signal, Since the closing signal is output immediately and the opening and closing signals are received to control the opening and closing of the solenoid valve by the drive circuit, unnecessary drainage of water in the flush valve can be reliably prevented and water saving can be achieved. The effect that the effect is enhanced can be obtained.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a flash valve controller according to an embodiment of the present invention, FIG. 2 is a timing chart showing signal transients of various parts of the circuit shown in FIG. 1, and FIG. FIG. 4 is a flow chart showing the procedure, and FIG. 4 is a schematic view showing a conventional flash valve device. 2, 3 ... Rectification smoothing circuit, 2 ... Rectifier, 3 ... Smoothing capacitor, 7 ... Microcomputer, 8 ... Drive circuit, 9 ... DC latch type solenoid valve (solenoid valve).

Claims (1)

[Claims] 1. A rectifying / smoothing circuit for rectifying and smoothing an AC power supply, and, when the AC power supply is turned on, after receiving an output of the rectifying / smoothing circuit and outputting an open signal, a closed signal is output after a lapse of a predetermined time. A microcomputer that outputs a close signal similar to the above when outputting or when the AC power supply is cut off during the output of the open signal, and a DC latch that receives the open signal or the close signal output by the microcomputer Flash valve controller equipped with a drive circuit that opens and closes a solenoid valve.