JPH0348297B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a hot water temperature control mechanism in a human body private parts cleaning device for a toilet.

(Prior Art) As shown in FIGS. 5 and 6, a hot water temperature control mechanism in a conventional human body private parts cleaning device for a toilet detects the temperature of water in a hot water tank 1 with a sensor (thermistor) 2, A relay switch 4 was turned on and off via a control circuit 3, and water in a hot water tank 1 was heated by a heater 5.

That is, assuming that there is a relationship R _T =f(T) between the temperature (T) sensed by the sensor 2 and the resistance value (R _T ), as shown in FIG. The temperature of the hot water in tank 1 rises to point A (temperature
T ₂ ), the resistance value of sensor 2 becomes R ₂ = f
(T ₂ ), the relay switch 4 is turned off, and the heater 5 is turned off. Then, the temperature of the hot water in the hot water tank 1 gradually decreases, and when it reaches point B (temperature T ₁ ), R ₁
= f(T ₁ ), the relay switch 4 is turned on, the heater 5 is turned on, and the hot water temperature is raised again.

In FIG. 5, 6 is a water supply conduit, 7 is a valve attached to this conduit 6, and 8 is a cleaning nozzle.

The configuration of the control circuit is as shown in FIG. 8, and a signal is output from the comparator 9 to the CPU 10 in accordance with the resistance value ( _RT ) of the sensor 2. This CPU 10 outputs an ON signal for the relay switch 4 when the input port 10a is L (low level), and outputs an OFF signal when the input port 10a is H (high level).

In the control circuit shown in FIG. 8, the upper reference value of the resistance R _T at which the input port 10a is inverted is R _T =YL(1/X+1/Z+A), and the lower reference value is R _T =X/L(1/1/ Y+1/Z).

In Fig. 9, (1) Between t ₁ and _{t 2} , the _RT reference value at which input port inversion occurs is the upper reference value YL (1/X+1/Z+A), and at this time the resistance value of sensor 2 R _T is R _T <YL (1/X+1/Z+A), input port 10a is H, and CPU
A relay off signal is output from 10 and heater 5
is off.

(2) At time _t2 , input port 10a is inverted and becomes L at R _T YL (1/X+1/Z+A),
A relay-on signal is output from the CPU 10 and the heater 5 is turned on. At the same time, the R _T reference value changes to the lower limit reference value, X/L (1/1/Y+1/Z).

(3) Between time t ₂ and _{t 3} , R _T >X/L (1/1/Y+1/Z) and the input port 10a is at L,
The heater 5 is turned on by a relay-on signal from the CPU 10.

(4) At time _t3 , input port 10a is inverted and becomes H at R _T =X/L (1/1/Y+1/Z),
A relay off signal is output from the CPU 10 and the heater 5 is turned off. At the same time, the reference value changes to the upper reference value YL (1/X+1/Z+A) at _RT .

Thereafter, the processes (1) to (4) above are repeated, and as shown in FIG. 7, the temperature of the hot water in the hot water tank ₁ reaches T1~
It was supposed to be maintained at a comfortable operating temperature of _T2 .

(Problem to be Solved by the Invention) However, in the conventional hot water temperature control mechanism described above, cleaning is started (time _t5 ) between time _t3 and _t4 in FIG. 9, and hot water is jetted from the nozzle 8. is,
At the same time, when the valve 7 opens and cold water flows into the hot water tank 1, the temperature of the hot water drops rapidly.
On the other hand, as can be seen from FIG. 10, even if cleaning is started, the input port 10a does not reverse until the resistance value R _T of the sensor 2 reaches R _T =YL (1/X+1/Z+A), and the heater 5 was not turned on, the temperature of the ejected water dropped rapidly, and the duration of the comfortable operating temperature was extremely short.

An object of the present invention is to eliminate the drawbacks in the hot water temperature control of the conventional human body private parts washing device.

More specifically, the present invention provides a simple and durable human body private parts cleaning device that can start energizing the heater within a short time after the cleaning switch is turned on, and can maintain a comfortable temperature of the cleaning water for a long time. The purpose of this invention is to provide a hot water temperature control mechanism with high performance.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes a sensor that detects the temperature of hot water in a hot water tank, a heater installed in the hot water tank, A human body private parts cleaning device comprising a relay that turns on and off electricity to the heater, and a control circuit that issues a signal to turn the relay switch on and off depending on the temperature of the hot water detected by the sensor. In the hot water temperature control mechanism, a cleaning start detection means detects that cleaning has started, and when the control circuit is in a relay switch off state signal, the cleaning start detection means detects that cleaning has started. The device is characterized in that it includes switching means for switching the control circuit to a signal that turns on the relay switch.

(Operation) In the above invention, even when the control circuit turns off the relay switch, when the cleaning start detection means detects that cleaning has started, the temperature of the hot water detected by the sensor changes. Even if the control circuit does not reach the value that turns on the relay switch, the switching means immediately switches the control circuit to the state that turns on the relay switch, turns on the heater, and turns on the hot water. Heating of the hot water in the tank begins.

(Example) The present invention will be described below based on an example shown in the drawings.

FIG. 1 shows an embodiment of the control circuit 11 of the hot water temperature control mechanism according to the present invention, in which a relay 13 is provided between the output terminal 9a of the comparator 9 and the ground, and the CPU 12 is connected to the output port 1.
2b is provided, and this output port 12b and relay 13 are connected via a transistor 14. The other configuration of this control circuit 11 is the same as that of the conventional control circuit 3 shown in FIG.

Furthermore, as shown in FIG. 2, a spouted water sensor 15 is attached to the attachment portion of the nozzle 8 of the hot water tank 1, and is connected to the CPU 12 of the control circuit 11.

In the hot water temperature control mechanism, when cleaning is started at time _t5 in FIG. 3 and hot water is jetted from the nozzle 8, this is sensed by the jetted water sensor 15 and a signal is input to the CPU 12.

When a signal is input from the jet water sensor 15 to the CPU 12, the output port 12b of the CPU 12 changes from H to L (returns after about 2 seconds), and the relay 13 is turned on. When the relay 13 is turned on, the input port 12a changes from H to L, and the heater 5 is turned on. At the same time, R _T
, the reference value changes from the upper reference value YL (1/X+1/Z+A) to the lower reference value X/L (1/1/Y+1/Z).

As a result, the heater 5 is turned on immediately after the start of cleaning, so as shown in FIG.
After t ₅ , the change in hot water temperature becomes gradual (solid line α), and the time to maintain the comfortable temperature of hot water becomes t _B , which is longer than the conventional (broken line β) t _A , and the hot water temperature is kept at a comfortable temperature during washing. It is something that can be maintained.

In the above embodiment, the jet water sensor 15 is used to detect the start of cleaning, but when the cleaning switch is turned on, a cleaning start signal may be input from the cleaning switch to the control circuit. .

[Effects of the Invention] As described above, in the present invention, even when the cleaning start detection means and the control circuit are in a state where the relay switch is turned off, the cleaning start detection means detects that cleaning has started. Then, the temperature inside the hot water tank decreases to the lower limit by switching the control circuit to the state where the relay switch is turned on, and the temperature of the hot water detected by the sensor causes the control circuit to turn on the relay switch. Even if the state is not yet reached, when cleaning is started, the switching means immediately switches the control circuit to the state where the relay switch is turned on. Electricity starts, and the comfortable operating temperature of the wash water can be maintained for a longer period of time than with conventional systems.

As a result, the number of times the relay is turned on and off increases, as would be the case if the hysteresis value of the relay's on/off point is reduced so that the relay operates immediately even in response to small temperature changes. There is no risk that this will decrease.

Furthermore, by using a heater of the size necessary to keep the wash water warm when not using it, without increasing the heater's capacity (heat generation amount), and using a relay of the same standard as before, without compromising durability. , it is possible to ensure sufficient comfortable temperature retention time during use. Furthermore, although temperature stability can be increased by increasing the amount of water stored in the hot water tank, in the present invention there is no need to increase the size of the hot water tank.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a control circuit showing one embodiment of the present invention, Fig. 2 is a configuration diagram showing a hot water temperature control mechanism in the same embodiment, and Fig. 3 is a change in the resistance value of the sensor in the same embodiment. FIG. 4 is a graph showing changes in hot water temperature in the same example. FIG. 5 is a configuration diagram showing a conventional hot water temperature control mechanism.
Figure 6 is a block diagram of the control mechanism, Figure 7 is a graph showing changes in hot water temperature in the control mechanism, Figure 8 is a circuit diagram of the control circuit in the control mechanism, and Figure 9 is the sensor in the control mechanism. FIG. 10 is a graph showing changes in the resistance value of the sensor when cleaning is started with the relay switch in the OFF state in the same control mechanism. 1... Hot water tank, 2... Sensor, 3... Control circuit, 4... Relay switch, 5... Heater, 1
DESCRIPTION OF SYMBOLS 1...Control circuit, 12...CPU, 12a...Input port, 12b...Output port, 13...Relay, 14...Transistor, 15...Gushing water detection sensor.

Claims (1)

[Claims] 1. A sensor that detects the temperature of hot water in the hot water tank, a heater installed in the hot water tank, and a relay that turns on and off power to the heater.
In a hot water temperature control mechanism of a human body private parts cleaning device, the hot water temperature control mechanism includes a control circuit that issues a signal to turn the relay switch on or off in accordance with the temperature of the hot water detected by the sensor, detecting that cleaning has started. cleaning start detection means for detecting the start of cleaning; and when the control circuit is at a relay switch off state signal,
A hot water temperature control mechanism for a human body private parts cleaning device, characterized in that the mechanism includes: a switching device that switches a control circuit to a signal that turns on a relay switch when the cleaning start detection device detects that cleaning has started. .