JPH01203828A - Hot water and water mixing device - Google Patents

Abstract

PURPOSE:To close a flow rate adjusting valve with respect to service interruption during hot water supply and to ensure the long-term life of an auxiliary power source by providing the hot water and water mixing device with an auxiliary power source for supplying power, total closure detection means for detecting the total closure of a flow rate adjusting valve, and an auxiliary power source interruption circuit which becomes an open path by a totally closed detection signal of the flow rate adjusting valve when service interruption is detected. CONSTITUTION:At the time of service interruption, and output voltage of a constant- voltage circuit 19 runs out, and a service interruption detection circuit 21 detects service interruption. When a flow rate adjusting valve 4 is not totally enclosed by detecting the signal of a totally-enclosed limit switch 16, a microcomputer 18 sends a signal for closing the flow rate adjusting valve 4 to a motor driver IC 17 and, at the same time, turns on a transistor 26 for driving. A current is supplied to the microcomputer 18 from a battery 25 through a reverse flow preventing diode 22. When the totally enclosed limit switch 16 detects the total closure, the microcomputer 18 sends a signal for stopping the flow rate adjusting valve 4 and, at the same time, turns off a driving transistor 26 and an interrupting transistor 25.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water mixing device for mixing hot water and water.

BACKGROUND ART A conventional hot water mixing device of this type has the following features, as shown in FIG.
It is configured to use Gold Capacitor 31 as an auxiliary power source, and if a power outage occurs while the user is dispensing hot water using the mixing device, the flow control valve drive morph 2 will not operate and the dispensing of hot water cannot be stopped. In order to solve the problem, the gold capacitor 31 supplies power to the flow rate control valve drive motor 2 to close the flow rate control valve (not shown) and stop hot water dispensing. (For example, Japanese Unexamined Patent Publication No. 62-263615) The operation will be explained with reference to FIG.

33 is a commercial power source. When the power is on, the power failure detection circuit 34 is not operating. Gold capacitor 31 is constant voltage circuit 3
6, it is charged via the reverse current prevention diode 36. When a power outage occurs, the power outage detection circuit 34 sends a power outage detection signal to the microcomputer 37. In order to close the microcomputer 37afiiL control valve, the flow control valve drive motor 32 is driven via the motor drive IC 38.

39 is a fully closed detection limit switch that detects the fully closed state of the flow control valve. When the flow rate control valve is fully closed, the microcomputer 37 stops the flow rate control valve drive motor 32 in response to a signal from the fully closed limit switch. □The above operation is performed using the gold capacitor 31 as a power source. The gold capacitor 31 backs up the microcomputer 37 until the power outage ends.

Problems to be Solved by the Invention However, with the above configuration, it takes a long time to charge the gold capacitor, so there is not enough electricity at the beginning of energization to close the flow control valve, or the performance of the gold capacitor deteriorates due to long-term use. However, there was a problem in that it was impossible to back up data over a long period of time.

One possibility is to use a gold capacitor as a secondary battery, but the performance of secondary batteries deteriorates due to repeated charging and discharging. Furthermore, even if a primary battery is used, it has the problem that it will be completely discharged in a long-term power outage.

The present invention solves such conventional problems by allowing the user to close the flow control valve at any time in the event of a power outage while hot water is being dispensed from the hot water mixing device, and by guaranteeing the long life of the auxiliary power source. Tossuru aims to be maintenance free.

Means for Solving the Problems In order to solve the above problems, the hot water mixing device of the present invention has the following features:
A mixing valve that adjusts the mixing ratio of hot water and water, a flow control valve that adjusts the mixing flow rate, an electric drive means that drives the flow control valve, a power supply, a power failure detection means that detects a power outage, and a power supply in the event of a power outage. The system is equipped with an auxiliary power source that supplies the flow rate control valve, a fully closed detection means that detects when the flow rate control valve is fully closed, and an auxiliary power cutoff circuit that closes when a power outage is detected and opens when the flow rate control valve is fully closed detection signal. be.

Operation With the above configuration, if a power outage occurs while a user is using the mixing device to dispense hot water, the auxiliary power supply supplies power to the flow control valve and closes it.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of a hot water mixing device, and FIG. 2 is a circuit diagram of the same device.

In FIG. 1, 1 is a water supply port, 2 is a hot water supply port, 3 is a hot water outlet, 4 is a flow rate control valve that adjusts the amount of hot water dispensed and stops the hot water supply;
6 is a flow control valve drive motor, 6 is a mixing valve that mixes hot water and water at a constant mixing ratio, 7 is a water side valve body directly connected to the mixing valve, 8 is a hot water side valve body directly connected to the mixing valve, 9 is a mixing valve Valve drive motor, 1
0 is a hot water outlet temperature sensor that detects the hot water temperature, 11 is a flow rate sensor that detects the amount of hot water dispensed, 12 is a pressure equalization valve for improving mixing performance, 13 is the mixing valve body, 14 is a controller, 1
6 is a setting device. By moving the mixing valve 6 left and right according to the temperature setting from the setting device 16, the ratio of hot water and water to be mixed is changed and adjusted to the set temperature. The flow rate is adjusted by moving the flow control valve 4 left and right according to the flow rate setting of the setting device 16. In FIG. 2, 6 is a flow rate control valve drive motor, 16 is a fully closed limit switch that detects the fully closed state of the flow rate control valve, 17 is a motor driver IC that drives the flow rate control valve, 1a is a microcomputer, 1
9 is a constant voltage circuit, 20 is a commercial power supply, 21 is a power failure detection circuit, 22.23 is a backflow prevention diode, 24 is a battery for auxiliary power supply, 26 is a cutoff transistor, 26 is a drive transistor for the cutoff transistor 26, 27 is a battery voltage drop display circuit.

The operation will be explained with reference to FIG.

When the power is on, the power failure detection circuit 21 is not operating. The microcomputer 18 outputs a signal to turn off the drive transistor 26. When the drive transistor 26 is off, the cutoff transistor 25 is also off, and the voltage of the stain pond is applied only to the battery voltage drop display circuit 2f. The amount of electricity consumed by the battery voltage drop display circuit 27 is minute.

The backflow prevention diode 22 prevents the battery 24 from being charged by the output voltage of the constant voltage circuit 19 when the commercial power supply is energized. A lithium battery, which is a primary battery, is used in consideration of long-term storage. The backflow prevention diode 23 prevents voltage from being applied from the battery 24 to the power failure detection circuit 21 during a power failure. When a power outage occurs, the output voltage of the constant voltage circuit 19 disappears, and the power outage detection circuit 21 detects the power outage.

If the signal from the fully closed limit switch 16 is detected and the flow rate control valve 4 is not fully closed, the microcomputer 18 sends a signal to the motor driver IC 17 to close the flow rate control valve 4, and at the same time turns on the drive transistor 26. ,
The cutoff transistor 26 is turned on. The microcomputer 18 is connected to the battery 24 through the backflow prevention diode 22.
supply current to. When the fully closed limit switch 16 detects that it is fully closed, the microcomputer 18 sends a signal to the motor driver IC 17 to stop the flow control valve 4, and at the same time turns off the drive transistor 26 and turns off the cutoff transistor 26. The battery 24 backs up the microcomputer 18, motor driver IC 17, and flow rate control valve drive motor 5 only while the flow rate control valve 4 is operating.

Next, other embodiments of the present invention will be described.

The circuit configuration is the same as that of the previous embodiment. In the event of a power outage, the output voltage of the constant voltage circuit disappears and the power outage detection circuit 21'' detects the power outage.If the signal from the fully closed limit switch 16 is detected and the flow control valve 4 is not fully closed, the microcomputer 1
8 sends a signal to the motor driver IC 17 to close the flow control valve 1, and at the same time turns on the drive transistor 26 and turns on the cutoff transistor 26. battery 2
4 supplies current to the microcomputer 18 via a backflow prevention diode 22. Microcomputer 1
After the timer built in 8 counts a sufficient time for the flow rate control valve 4 to close, the microcomputer 18 sends a signal to the motor driver IC 17 to stop the flow rate control valve 4, and at the same time turns off the drive transistor 26. Then, the cutoff transistor 25 is turned off. The battery 24 backs up the microcomputer 18, motor driver IC 17, and flow rate control valve drive motor 6 for the time necessary for the flow rate control valve 4 to operate.

Effects of the Invention According to the hot water mixing device of the present invention, the following effects can be obtained.

(1) Since it is backed up by an auxiliary power source, it is possible to solve the problem that the flow control valve does not operate during a power outage, making it impossible to stop the hot water supply.

(2) In the event of a power outage during hot water dispensing, the auxiliary power source backs up the power only while the flow rate control valve is closed, so the battery life is long and maintenance by the user is not required.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a hot water mixing device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the same device, and FIG. 3 is a circuit diagram of a conventional hot water mixing device. 4...Flow rate control valve, 5...Flow rate control valve drive motor, 6...Mixing valve, 14...
Controller, 16... Fully closed limit switch, 17
...Motor driver IC. 20...Commercial power supply, 21...Power failure detection circuit, 24...Battery, 26...Transistor for cutoff, 26...For drive transistor. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
j Rough amount adjustment sardine valve Fig. 1 Fig. 2 Fig. 3

Claims (2)

[Claims] (1) A mixing valve that adjusts the mixing ratio of hot water and water, a flow rate adjustment valve that adjusts the mixing flow rate, an electric drive means that drives the flow rate adjustment valve, a power supply, and a power failure detection means that detects a power outage. , comprising an auxiliary power source that supplies power during a power outage, a fully closed detection means that detects when the flow rate control valve is fully closed, and an auxiliary power cutoff circuit that is closed when a power outage is detected and is opened in response to a fully closed detection signal of the flow rate control valve. Hot water mixing device. (2) The hot water mixing device according to claim 1, comprising an auxiliary power cutoff circuit that is closed for a certain period of time when a power outage is detected.