JPH018613Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sanitary cleaning device equipped with a feed water heating device and its temperature control circuit.

[Conventional technology]

In sanitary cleaning equipment, it is necessary to perform temperature control to heat the temperature of cleaning water to an appropriate temperature.

In particular, since cleaning water comes into direct contact with sensitive parts of the human body, it is absolutely necessary to avoid discharging water at a temperature that feels cold to the human body, or discharging hot water that has been heated to a temperature higher than that at which it feels hot. It won't happen.

For this purpose, the applicant previously proposed a sanitary cleaning device with the following configuration.

The sanitary cleaning device has a water inlet at the bottom of the tank so that the water supplied into the tank pushes up the hot water stored in the tank and hot water is spouted from the outlet at the top of the tank. Furthermore, a heater serving as a heating section is also placed at the lower part of the tank in order to efficiently heat the water supplied into the tank. In addition, two temperature sensors are arranged in the hot water storage tank, the first temperature sensor of which is installed near the water inlet at the bottom of the hot water storage tank, the second temperature sensor is installed near the hot water outlet at the top of the hot water storage tank, These constitute a temperature detection section. Furthermore, a temperature control circuit section is provided that controls energization to the heating section based on the output signal of the temperature detection section.

Then, the second temperature sensor detects the temperature in the hot water storage tank, and the supply of electricity to the heating section is controlled based on the detected value so that the hot water temperature reaches the set value.

By the way, the hot water in the upper part of the hot water storage tank, that is, near the hot water outlet, is at the highest temperature, and the hot water at that temperature is discharged from the hot water outlet, so if the temperature near the hot water outlet is detected and the heating part is controlled, The general concept of temperature control is that it is sufficient.

However, such a situation occurs when the water in the hot water storage tank is close to still water and there is no time delay between the detection of the hot water temperature and the rise in the temperature of the hot water due to the operation of the heating section. When the temperature of the water coming in from the water inlet is cold, or when hot water is used continuously, there is actually a time lag between when electricity is applied to the heating section and when the temperature rises. Because of this time lag, temperature control using only a temperature sensor provided near the tap outlet based on the above-mentioned general concept of temperature control is insufficient.

Therefore, in the cleaning device proposed above, a first temperature sensor is provided in addition to a second temperature sensor corresponding to the temperature sensor provided near the tap outlet. This first temperature sensor detects the temperature of water supplied from the water inlet, and based on the detected value, the temperature control circuit immediately energizes the heating section, thereby preventing the upper part of the tank from being heated due to the water supply. This prevents the water temperature from dropping to a certain level. Moreover, when using such temperature control, the temperature of the water in the tank in the discharged water is also always maintained at the set value.

In other words, in addition to normal temperature control in which the heating section is energized if the temperature near the hot water outlet in the hot water storage tank is lower than the standard temperature Θ ₂ that is considered to be an appropriate temperature for the human body, the temperature near the hot water outlet is determined to be the standard temperature that is considered to be appropriate for the human body. Reference temperature Θ ₁ at which the temperature near the water inlet is a certain value even if it reaches Θ ₂
If the temperature is lower than that, hot water temperature control is performed by energizing the heating section. This ensures that water is always spouted at a predetermined temperature, even in the winter when the inlet water temperature is cold, or during continuous washing over a long period of time.

[Problem that the invention attempts to solve]

In this way, in the feed water heating device having the above configuration, the first objective is to suppress the discharge of hot water that feels cold to the human body as much as possible, and to always obtain cleaning water at a temperature equal to or higher than the reference temperature.

However, due to some internal or external factor, the water temperature in the tank rises, and the temperature of the hot water near the heat sensing part of the second temperature sensor exceeds the reference temperature θ ₂ , reaching a dangerous temperature that feels hot to the human body. There are insufficient functions to prevent this.

A second purpose of the present invention is to prevent hot water from reaching dangerously high temperatures under any circumstances.

[Means for solving problems]

In order to achieve the first and second objects, the sanitary cleaning device of the present invention includes a first temperature sensor installed near the water inlet at the bottom of the hot water storage tank, and a first temperature sensor installed near the hot water outlet at the top of the hot water storage tank. a second temperature sensor;
Based on the heating part provided in the hot water storage tank, the water temperature θ ₁ detected by the first temperature sensor, and the water temperature θ ₂ detected by the second temperature sensor, the following is performed.
It is characterized by comprising a temperature control section that controls energization to the heating section according to the conditions (a) to (c).

(a) When θ ₁ > Θ _R and θ ₂ < Θ _L , the heating section is energized.

(b) When θ ₁ < Θ _R and θ ₂ < Θ _H , the heating section is energized.

(c) When θ ₂ exceeds Θ _H , power is cut off to the heated part,
And, until θ ₂ < Θ _R , power supply to the heating section is stopped.

However, Θ _L : Lower limit temperature that the human body feels is appropriate. Θ _H : Upper limit temperature that the human body feels is appropriate. Θ _R : Set temperature lower than Θ _L.

[Effect]

In the present invention, when the second temperature sensor detects that the upper limit temperature, that is, the second set temperature Θ _H has been exceeded, the power supply to the heating part is forcibly cut off regardless of the temperature detected by the first temperature sensor. be done. Further, when the temperature of the hot water near the heat sensitive part of the second temperature sensor falls to the lower limit temperature, that is, the first set temperature Θ _L , temperature control of the heating part is restarted. Through this operation, the hot water temperature in the hot water storage tank returns to the normal control temperature range.

Here, if normal temperature control is resumed immediately when the temperature of the hot water near the heat-sensitive part of the second temperature sensor falls below the second set temperature Θ _H , the hot water will rise again to the second set temperature Θ _H. may be heated. Therefore, normal temperature control is resumed after waiting until the temperature drops to the first set temperature Θ _L.

In this way, by attaching the first temperature sensor, in addition to being able to prevent the spouting of low-temperature cleaning water, the reference set temperature Θ _R of the second temperature sensor is
By providing the first and second set temperatures Θ _L and Θ _H corresponding to the lower limit and upper limit temperatures that the human body feels are appropriate, it is possible to prevent high-temperature washing water from being spouted. As a result, the sanitary cleaning device has significantly improved safety features.

〔Example〕

Hereinafter, features of the present invention will be specifically explained with reference to drawings showing embodiments.

The figure shows an example of a temperature control circuit of a feed water heating device in a sanitary washing device according to an embodiment of the present invention.

The first and second temperature sensors each include a negative characteristic thermistor 1 and a negative characteristic thermistor 22. Further, the heating section includes a heater 27.

Next, this temperature control circuit will be explained.

Negative characteristic thermistor 1 as a first temperature sensor
The temperature θ ₁ of hot water near the heat-sensitive part of is the reference temperature Θ _R
When the resistance value of the negative characteristic thermistor 1 becomes lower than , the resistance value of the negative characteristic thermistor 1 increases. Therefore, the potential at point A, where the voltage division ratio between the resistance value of negative characteristic thermistor 1 and resistor 2 is obtained, is lower than the reference potential at point B, which is obtained from the voltage division ratio between resistor 3 and resistor 4, and the voltage comparison The output potential of the IC 5 at point C becomes high level. Conversely, when the temperature θ ₁ of the hot water near the heat-sensitive part of the negative characteristic thermistor 1 becomes higher than the reference temperature Θ _R , the potential at point C becomes a low level.

Negative characteristic thermistor 2 as second temperature sensor
When the temperature θ ₂ of the hot water near the second heat-sensitive part becomes lower than the low set temperature, that is, the first set temperature Θ _L ,
The resistance value of the negative characteristic thermistor 22 increases. Therefore, the potential at point 1 obtained by the voltage division ratio of the negative characteristic thermistor 22 and the resistor 23 is
The output potential of the voltage comparison IC 14 for the first set temperature becomes a high level. Conversely, when the temperature θ ₂ of the hot water near the heat-sensitive part of the negative characteristic thermistor 22 becomes higher than the first set temperature Θ _L , the F point potential becomes a low level.

The two-point reference potential of the voltage comparison IC 10 for the high set temperature, that is, the second set temperature, is given by the voltage division ratio of the resistor 8 and the resistor 9. Therefore, when the temperature θ ₂ of the hot water near the heat-sensitive part of the negative characteristic thermistor 22 becomes lower than the second set temperature Θ _H , the resistance value of the negative characteristic thermistor 22 increases, and the potential Q becomes lower than the two-point reference potential. It gets lower. As a result, the output hot point potential of the voltage comparison IC 10 becomes high level.
Conversely, when the temperature θ ₂ of the hot water near the heat-sensitive part of the negative characteristic thermistor 22 becomes higher than the second set temperature Θ _H , the hot point potential becomes low level.

The above is the basic operation of each voltage comparison IC corresponding to the temperatures detected by the negative characteristic thermistors 1 and 22 as the first and second temperature sensors.

Next, the operations of the logic circuits indicated by reference numerals 16 to 19 in the drawings will be explained.

When either or both of the potential at point C and the potential at point H are at a high level, the potential at which is the output of the OR gate IC16 becomes at a high level. On the other hand, when both the C point potential and the H point potential are at low level,
The point potential becomes low level. When the F point potential is at a high level, the N point potential, which is the output of the OR gate IC18, becomes a high level. At this time, if the potential at point H is at a high level, the potential at point R, which is the output of the AND gate IC17, is at a high level. point potential,
When both the N point potential and the H point potential are at a high level, the output of the AND gate IC19 becomes a high level, and the transistor 25 is turned on. And the applicable
The ON operation drives the solid state relay 26 and starts energizing the heater 27.

Here, when both the ho point potential and the f point potential are at a high level (that is, when the temperature of the hot water near the heat sensitive part of the negative characteristic thermistor 22 is below the first set temperature), the output of the OR gate IC 18 is If a certain N point potential is at H level, the signal is AND
Since it is fed back to the other terminal of the gate IC 17, even if the F point potential becomes low level (in other words, the temperature of the hot water near the heat sensitive part of the negative characteristic thermistor 22 is higher than the first set temperature, 2
(when the temperature is below the set temperature), OR gate IC18
The potential at the point N, which is the output of , will be held at a high level.

When any one of the R point potential, Nu point potential, and Ho point potential is low level, AND gate IC1
The output of transistor 9 becomes low level, and the transistor 25
is turned off. As a result, the solid state relay 26 is also turned off, and the power supply to the heater 27 is cut off.

Next, when the temperature of the hot water near the heat sensitive part of the negative characteristic thermistor 22 exceeds the second set temperature, the potential at the hot point becomes a low level. At this time, since the potential at the point F is also at a low level, the potential at the point L, which was held at a high level in the previous explanation, becomes a low level. Therefore, even if the temperature of the hot water near the heat-sensitive part of the negative characteristic thermistor 22 falls below the second set value and the potential at the point becomes high, if the potential at the point F is at a low level, the potential at the point N becomes low. Since is at low level, the potential at point Le continues to be at low level. Furthermore, when the temperature of the hot water near the heat-sensitive part of the negative characteristic thermistor 22 decreases to below the first set temperature and the F point potential becomes a high level, the N point potential becomes a high level.

In this way, when the temperature of the hot water near the heat-sensing part of the second temperature sensor exceeds the second set temperature, the power to the heater, which is the heating part, is cut off, and the heat-sensing part of the second temperature sensor is turned off. When the temperature of the hot water in the vicinity of the heater drops to the first set temperature, energization of the heater can be restarted.

Note that although the above description is based on an electric circuit diagram, it goes without saying that similar functions can be configured using software of a microcomputer.

[Effect of idea]

As explained above, according to the present invention, when the hot water outlet temperature exceeds the upper limit temperature that is felt to be suitable for the human body, electricity is cut off to the heater, which is the heating part, and after that, the hot water outlet temperature is kept at a temperature suitable for the human body. The heater is energized when the temperature drops to the lowest temperature limit. Therefore, even if the hot water temperature in the tank rises for some reason, it can be returned to the normal control temperature range. Therefore, by providing the first temperature sensor, it is possible to prevent the water temperature from decreasing to the upper part of the tank due to a time lag and being discharged as low-temperature cleaning water by speeding up the energization. In addition, the second temperature sensor can prevent water from being discharged on the high temperature side. As a result, the safety function of the sanitary cleaning device is significantly improved.

[Brief explanation of the drawing]

The figure shows an example of the temperature control circuit of the feed water heating device in the sanitary cleaning device of the present invention. 1: first temperature sensor, 5: voltage comparison IC,
10: Voltage comparison IC, 14: Voltage comparison IC, 1
6: OR gate IC, 17: AND gate IC, 1
8: OR gate IC, 19: AND gate IC, 2
2: second temperature sensor, 27: heater (heating section).

Claims (1)

[Scope of Claim for Utility Model Registration] A first temperature sensor provided near the water inlet at the bottom of the hot water storage tank, and a second temperature sensor provided near the water outlet at the top of the hot water storage tank.
a temperature sensor, a heating section provided in the hot water tank, and a water temperature θ ₁ detected by the first temperature sensor.
and a temperature control unit that controls energization to the heating unit based on the water temperature θ ₂ detected by the second temperature sensor and according to the conditions (a) to (c) below. cleaning equipment. (a) When θ ₁ > Θ _R and θ ₂ < Θ _L , the heating section is energized. (b) When θ ₁ < Θ _R and θ ₂ < Θ _H , the heating section is energized. (c) When θ ₂ exceeds Θ _H , power is cut off to the heated part,
And, until θ ₂ < Θ _R , power supply to the heating section is stopped. However, Θ _L : Lower limit temperature that the human body feels is appropriate Θ _H : Upper limit temperature that the human body feels is appropriate Θ _R : Set temperature lower than Θ _L.