JPH0637748Y2 - Overheating prevention device for shower system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention includes an electric mixing valve having a hot water supply pipe and a hot water supply pipe connected to each other, and a hot water temperature setting unit. The present invention relates to a device for preventing excessive temperature rise in a shower system, in which the hot water outlet temperature is controlled to a temperature set by a hot water temperature setting unit by controlling the mixing ratio of

(Prior art) Conventionally, the hot water temperature control of a shower (mainly a hand shower, etc.) used in a bathroom is a method of manually adjusting the hot water valve and the water valve opening provided in the shower room (manual mixing). Valve), or a method of manually adjusting the temperature scale of a mixing valve containing thermowax (thermo mixing valve).

(Problems to be solved by the invention) However, in the case of the manual mixing valve, if the hot water supply temperature suddenly rises for some reason, hot water may be directly discharged from the shower nozzle, and the thermo mixing valve may be used. In the case of, if hot water temperature rises due to something such as hitting the temperature setting dial, hot water may be discharged from the shower nozzle as well, which may cause burns. there were.

(Means for Solving the Problem) The present invention has been made in view of the above circumstances, and includes a hot water supply pipe, an electric mixing valve to which the water supply pipe is connected, and a hot water temperature setting unit.
In a shower system configured to drive an electric mixing valve to control a mixing ratio of hot water and water to control a hot water outlet temperature to a temperature set by a hot water temperature setting unit, a potentiometer interlocking with the electric mixing valve. And a limit switch interlocked with the potentiometer, the hot water temperature detecting section for directly detecting the hot water temperature, and the output of the potentiometer and the detection output of the hot water temperature detecting section detect the temperature of the hot water supplied to the shower room. The temperature rise is monitored, and when an abnormality occurs, the supply of hot water into the shower room is stopped, and the rise of the hot water temperature into the shower room is stopped by the operation of the limit switch.

(Operation) When the hot water temperature into the shower room is controlled to the temperature set by the hot water temperature setting unit, when the hot water temperature control does not operate due to a failure of the drive motor system of the electric mixing valve,
This failure is detected by the output of the potentiometer, and hot water is stopped. When the drive motor system of the electric mixing valve is normal but the excess hot water temperature cannot be detected due to a failure of the potentiometer, the hot water temperature detection unit directly detects the hot water temperature and stops hot water discharge. . Furthermore, if both the potentiometer and hot water temperature detection unit fail, or if the drive motor of the electric mixing valve continues to operate due to runaway of the microcomputer, the limit switch operates and the drive motor is stopped by hardware, and the shower Provide hot water temperature rise to the room.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a schematic piping diagram and an electric wiring diagram of a shower system equipped with an overheat prevention device according to the present invention, and FIG. 1 shows a schematic block diagram of only an electric control system of the device. .

The electric mixing valve 1 is for adjusting the temperature of the hot water discharged, and the water supply pipe 2
And hot water supply pipe 3 are connected. Hot water mixed at a predetermined temperature by the electric mixing valve 1 passes through a hot water supply pipe 4,
It is divided into a plurality of (four in this example) shower pipes 5a to 5d and a waste water pipe 5e. The hot water supply pipe 4 is provided with a hot water supply pressure pump 6 for adjusting the hot water supply pressure and a thermistor sensor (hot water temperature detection unit) 7 for detecting the hot water supply temperature. This thermistor sensor 7 is a shower pipe 5a-5d
Can also be provided. Electric shower two-way valves 8a-8d are provided in each of the shower pipes 5a-5d. Further, a first electric two-way valve for waste water 8e is provided on the outlet side of the hot water supply pressure pump 6 of the hot water supply pipe 4, and a second electric two-way valve 8f for waste water is provided on the waste water pipe 5e. ing.

The shower room 9 is composed of a cylindrical private room unit, and the shower pipe 5a is connected to a ceiling shower port 10a attached to the ceiling of the shower room 9. Further, one end of each of the shower pipes 5b to 5d other than the shower pipe 5a has three nozzle openings provided on the peripheral wall of the shower chamber 9, respectively.
While being connected to 10b to 10d, the one end is branched and piped around the outer peripheral surface of the shower chamber 9 for approximately half a round, and the other end is arranged at a position substantially facing the nozzle ports 10b to 10d. It is connected to each of the nozzle openings 10b'-10d '.

The hot water temperature detected by the thermistor sensor 7 is a comparison means.
The temperature is compared with a preset temperature in 18 and, based on the comparison result, the electric mixing valve 1, the hot water supply pressurizing pump 6, the hot water discharge two-way valves 8a to 8d, and the first waste water are supplied via the control unit 19. The operation of the electric two-way valve 8e for water and the second electric two-way valve 8f for waste water is controlled. The open / closed state is detected on each rotary shaft of the electric mixing valve 1, the hot water discharging two-way valves 8a to 8d, the first wastewater electric two-way valve 8e, and the second wastewater electric two-way valve 8f. Potentiometers are provided respectively, and the control unit 19 controls the electric two-way valves 8a to 8a depending on the outputs of these potentiometers.
Checking the open / closed status of 8f. Further, a limit switch 22 is provided on a potentiometer 21 (see FIG. 4) provided on the rotary shaft of the electric mixing valve 1. On the other hand, in the shower room 9, a hot water outlet opening / closing unit 12a for controlling the start and stop of hot water, a hot water temperature setting unit 12b for setting the hot water temperature, and an alarm sound when the hot water temperature rises excessively A display panel 13 of a main remote controller 12 (see FIG. 1) provided with a buzzer output section 12c and the like is attached. In addition, in FIG.
The area surrounded by the broken line is composed of the microcomputer 20.

FIG. 3 shows the circuit configuration of the electric mixing valve 1, and FIGS. 4 to 6 show the structure of the electric mixing valve 1.

In FIG. 4 to FIG. 6, the electric mixing valve 1 has a gear 25 fixed to its rotary shaft, and is linked to a drive motor 29 via the gear 25 and the other three gears 26 to 28. ing. Two sliders (sliding contactors) A and B are provided on the lower surface of the gear 25.
Are formed so as to project downward. On the other hand, below the gear 25, a substrate 30 provided with a potentiometer 21 is arranged so as to face it, and the tip of the slider B is in contact with the potentiometer 21 on this substrate 30. The slider B and the slider A are connected to each other, and the output of the potentiometer 21 is taken out via the slider A and supplied to the control unit 19. A switch bar C is formed on the lower surface of the gear 25 so as to project downward along the extension lines of the sliders A and B, and a limit switch 22 operated by the switch bar C is provided on the substrate 30. There is. The limit switch 22 is provided at a position on the substrate 30 that operates by contacting the switch bar C at a hot water temperature of about 50 ° C., and the hot water temperature rises into the shower room 9 by the operation of the limit switch 22. Is supposed to stop.

FIG. 7 shows an example of a display panel provided in the shower room 9.

In this display panel, the hot water temperature setting unit 12b is composed of two switches 41 and 42 for high and low, and nine display LEDs 43, 43 ... Every time the high switch 41 is pressed, the display LED 43 is 1 to the right.
Each one lights up, and the control temperature rises by about 1 ° C. Further, each time the low switch 42 is pressed, the display LED 43 is turned off one by one to the left, and the control temperature is lowered by about 1 ° C. Then, when the low switch 42 is continuously pressed, the display LED 43 showing water is turned on at last, and the control temperature becomes water.
The lit display LED 43 is calculated by the control unit 19 and converted into a control temperature. Control of the electric mixing valve 1, control and monitoring of the potentiometer 21, monitoring of the temperature of the thermistor sensor 7 and the like are performed on the basis of the converted control temperature to prevent an excessive rise in hot water temperature.

The thermistor sensor 7, the potentiometer 21 and the like are self-diagnosed so as to report a failure such as a disconnection or a short circuit. 8 and 9 show characteristic curve diagrams of the thermistor sensor 7 and the potentiometer 21, respectively.

The characteristic curve of FIG. 8 is expressed by the following equation (1), where the hot water temperature is X (° C.) and the output of the potentiometer 21 is a (V).
It is obtained by the microcomputer temperature calculation formula according to (2).

X = (Y-59) /4.4+30 (1) Y = a / 5 × 256 (2) Further, the characteristic curve of FIG. It is calculated by the microcomputer temperature conversion calculation formula.

Next, the operation of the overheat prevention device having the above configuration will be described.

Normally, the drive motor 29 is operated to control the electric mixing valve 1 so that the temperature is set by the hot water temperature setting unit 12b, and this control is monitored by the output of the potentiometer 21.

In this state, if the hot water temperature control does not operate due to a failure of the drive motor system of the electric mixing valve 1, this failure is detected by the output of the potentiometer 21, and the hot water outlet temperature is excessively raised based on this detection output. When it is determined that
The electric mixing valve 1 is closed and an alarm sound is generated from the buzzer output section 12c. Further, when the drive motor system of the electric mixing valve 1 is normal but the excessive rise of the hot water discharge temperature cannot be detected due to the failure of the potentiometer 21, the thermistor sensor 7 directly detects the hot water discharge temperature, and the detected temperature is detected. When it is determined that the base hot water temperature has risen excessively, the electric mixing valve 1 is closed and an alarm sound is generated from the buzzer output section 12c. Furthermore, if both the potentiometer 21 and the thermistor sensor 7 fail, the microcomputer
When the drive motor 29 of the electric mixing valve 1 continues to operate due to the runaway of 20, the limit switch 22 operates to stop the drive motor 29 in a hardware manner and stop the rise of hot water in the shower room. To do.

(Effect of the Invention) As described above, according to the overheat prevention device of the present invention, since the double and triple temperature rise prevention means is provided,
Even when the hot water outlet temperature is about to rise excessively due to a failure of the control unit, the hot water supply side, or the water supply side, it is possible to reliably stop the shower or stop the rise of the hot water temperature.

[Brief description of drawings]

The drawings show one embodiment of the overheat prevention device of the present invention. FIG. 1 is a schematic block diagram of an electric control system of the overheat prevention device, and FIG. 2 is a shower system equipped with the overheat prevention device. Is a schematic piping diagram and electric wiring diagram, FIG. 3 is a circuit configuration diagram of the electric mixing valve, FIG. 4 is a diagram showing a positional relationship between the potentiometer on the substrate and the slider and the limit switch,
FIG. 5 is a partially cutaway front view showing the structure of the electric mixing valve,
FIG. 6 is a diagram showing a gear mechanism, FIG. 7 is a diagram showing an example of a display panel in a shower room, FIG. 8 is a characteristic curve diagram of a potentiometer, and FIG. 9 is a characteristic curve diagram of a thermistor sensor. 1 ... Electric mixing valve, 2 ... Water supply pipe 3 ... Drain pipe, 7 ... Thermistor sensor 12b ... Hot water temperature setting part, 21 ... Potentiometer 22 ... Limit switch

Claims (1)

[Scope of utility model registration request] 1. A hot water temperature setting unit comprising an electric mixing valve connected to a hot water supply pipe and a hot water supply pipe and a hot water temperature setting unit, and driving the electric mixing valve to control the mixing ratio of hot water and water. In a shower system configured to control the hot water temperature to a temperature set by, a potentiometer that interlocks with the electric mixing valve, a hot water temperature detection unit that directly detects the hot water temperature, and a limit switch that interlocks with the potentiometer. And monitoring the temperature rise of the hot water supplied to the shower room by the output of the potentiometer or the detection output of the hot water temperature detection unit, when an abnormality occurs, stop the supply of hot water into the shower room, and the limit A device for preventing excessive temperature rise of a shower system, characterized in that the operation of a switch stops the rise of hot water in the shower room.