JPH0583690B2 - - Google Patents

Description

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

[Prior Art and Problems] 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, as shown in FIG. 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. In Fig. 4, 6 is a water supply conduit, 7 is a valve attached to this conduit 6, and 8 is a water supply conduit.
is a cleaning nozzle.

In this conventional hot water temperature control mechanism, since the hot water temperature control is a contact control using the relay 4, there is a certain limit to the number of on/off times. For this reason, a certain degree of temperature difference (hysteresis) is provided between the on-point temperature and the off-point temperature of the relay 4 to reduce the number of on/off times. For example, when washing water is not used, the on/off interval of the relay 4 is usually about 10 to 15 minutes.

However, in this conventional control mechanism, as shown in FIG. 5, the relay 4 is turned on and the heater 5 is energized at temperature T ₁ (point B), and the relay 4 is turned off at temperature T ₂ (point A). However, if cleaning starts immediately after relay 4 _is turned off, for example, even if cleaning starts at point C (T ₁ ) in FIG.
Since the heater 5 will not be energized unless the temperature drops to 100, the temperature of the hot water in the hot water tank 1 will drop rapidly due to the cold water introduced from the conduit 6, and the time it takes for the spouted water to reach a comfortable operating temperature will be shortened. There were flaws.

[Object of the Invention] An object of the present invention is to eliminate the drawbacks in the hot water temperature control of the conventional human body private parts cleaning device described above.

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] 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, and a switch for turning on and off electricity to the heater. The relay is turned on and off based on the temperature detection signal from the sensor and the temperature detection signal from the sensor.
In a hot water temperature control mechanism of a human body private parts cleaning device that is composed of a control circuit that sets a lower limit temperature and an upper limit temperature for turning off, while the cleaning switch is connected to the control circuit and the cleaning switch is turned on, the lower limit setting temperature is set by the cleaning switch. The lower limit set temperature of the heater is changed to a temperature higher than the original lower limit set temperature when the cleaning switch is turned off, and the set temperature is returned to the original lower limit set temperature when the cleaning switch is turned off. It is characterized by

[Operation] The above invention detects the temperature inside the hot water tank using a sensor, and based on the temperature detection signal from the sensor, the temperature inside the hot water tank is adjusted to the heater on temperature set in advance in the control circuit. When the lower limit temperature is reached, the relay is turned on to start energizing the heater, and when the heater's off temperature (upper limit temperature) is reached, the relay is turned off to cut off the energization to the heater.

When the cleaning switch is turned on, the heater lower limit temperature setting change means connected to the control circuit changes the heater lower limit temperature set in the control circuit to the temperature when the cleaning switch is turned off. When the cleaning switch is turned off, the lower limit set temperature of the heater returns to the original lower set temperature.

By using such technical means,
Even in the case where the cleaning switch is turned on immediately after the heater is turned off, energization to the heater is started in a short time, making it possible to maintain the comfortable temperature of the cleaning water for a long time.

[Example] The present invention will be described in more detail below based on an example shown in the drawings. In addition, in the following description, the same reference numerals are given to the same parts as in the prior art.

In FIG. 1, a sensor 2 is installed in a hot water tank 1 to detect the temperature of hot water in the hot water tank 1 and output a detection signal to a control circuit 3. As shown in FIG. This sensor 2 has a built-in thermistor that utilizes the fact that the resistance value changes with changes in hot water temperature.

The control circuit 3 controls the heater 5 arranged in the hot water tank 1 based on the temperature detection signal from the sensor 2.
The relay 4 outputs an on/off electrical signal, and the relay 4 turns on/off the electricity to the heater 5 .

The above is the same as the conventional one, but in the present invention, the CPU 11 is connected to the control circuit 3, and the CPU 11 is connected to the control circuit 3.
1, when the cleaning switch 12 is turned on, the heater 5
The current starting temperature (lower limit set temperature) T is set to the normal temperature.
It is designed to be set at T ₃ , which is higher than T ₁ .

The on/off control of the heater 5 by the CPU 11 will be explained with reference to the flow chart shown in FIG. 2. When the cleaning switch 12 is off, the control circuit 3 sets the lower limit temperature of the heater 5 to _T1 , the upper limit temperature setting is set to _T2 (a), and the heater 5 is turned on and off while the cleaning switch 12 is off due to the hysteresis value ΔT between _T1 and _T2 .
Off is repeated (b).

When the cleaning switch 12 is turned on (c), the CPU 11 changes the lower limit set temperature T ₁ of the heater 5 in the control circuit 3 to T ₃ (T ₁ < T ₃ < T ₂ ) (d)
However, depending on the hysteresis value ΔT' between T ₃ and T ₂ , the heater 5 is turned on and off while the cleaning switch 12 is on (e).

Then, when the cleaning switch 12 is turned off,
The CPU 11 changes the lower limit set temperature of the heater 5 in the control circuit 3 to T ₁ again (f), and then controls the temperature of the heater 5 according to the hysteresis value ΔT of T ₁ and T ₂ until the cleaning switch 12 is turned on. Turn on and off (a, b).

In this way, when the cleaning switch 12 is turned on, the CPU 11 sets the lower limit temperature of the heater 5 to T ₁
For example, by changing from T ₃ (T ₁ <T ₃ ) to T 3 (T 1 <T 3 ), the cleaning switch 1 is changed at point C (t ₁ ) in FIG.
When heater 2 is turned on and water starts to come out, heater 5
The cleaning switch 12 is turned on by ΔT' which is smaller than the hysteresis value ΔT when it is off, and the temperature change of the hot water is slower than the conventional temperature change (broken line β), as shown by the solid line α in Fig. 3. becomes. As a result, the heater 5, which was conventionally turned on at point B' in Fig. 3, is turned on at point C earlier than this, and the time t during which the comfortable operating temperature of the washing water is maintained. _A is longer than the conventional time _tB , allowing comfortable cleaning for a long time.

Therefore, under normal usage conditions, even if the water storage amount and heater capacity are set to the minimum so that the hot water temperature can be maintained between T ₁ and T ₂ , the temperature of the cleaning water during cleaning will remain at T _1. This can be sufficiently maintained between ~ _T2 .

[Effects of the Invention] As described above, the present invention includes means for changing the lower limit set temperature of the heater, which changes the on-temperature of the heater to a higher temperature than the on-temperature when the washing switch is off when the washing switch is turned on. As a result, the heater is turned on and off only during cleaning using a hysteresis value that is smaller than in the normal case, so even if the cleaning switch is turned on immediately after the heater is turned off, Energization to the heater starts within a short time, and the comfortable 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 points is reduced so that the relay operates immediately even in the face of small temperature changes. There is no risk that this will decrease. In addition, when a non-contact on/off method such as a triac is incorporated into the heater control section and the hysteresis value is reduced,
Because the triax becomes hot, it is necessary to install a heat dissipation device, and the frequent turning on and off of the relay may cause radio noise, which may increase product costs due to countermeasures. Nor.

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 the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing a method of controlling hot water temperature in the same embodiment, and FIG. 3 is a graph showing changes in hot water temperature in the same embodiment. FIG. 4 is a block diagram showing a conventional hot water temperature control mechanism, and FIG. 5 is a graph showing changes in hot water temperature due to the control mechanism shown in FIG. 1... Hot water tank, 2... Sensor, 3... Control circuit, 4... Relay, 5... Heater, 11...
CPU, 12...Cleaning switch.

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 electricity to the heater.
A hot water temperature control mechanism for a human body private parts cleaning device comprising a control circuit that respectively sets a lower limit temperature and an upper limit temperature for turning on and off a relay based on a temperature detection signal from the sensor, connected to the control circuit,
While the cleaning switch is on, the lower limit temperature setting is changed to a higher temperature than the original lower limit temperature setting when the cleaning switch is off, and when the cleaning switch is turned off, this set temperature is changed to the original lower limit setting. 1. A hot water temperature control mechanism for a human body private parts cleaning device, comprising: means for changing a lower limit set temperature of a heater to return to the temperature.