JPS6329174B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a hot water heating system for heating floors and the like.

[Background technology]

Conventional hot water heating systems that perform floor heating
As shown in the figure, hot water at a constant temperature (for example, 80°C) from a water heater 2 such as a gas water heater installed indoors 1 is circulated through a pipe 3 to a hot water panel 5 such as a heated floor panel indoors 4. A thermal valve 6 is inserted into the pipe 3, a heater 7 such as a POSISTOR is placed adjacent to the thermal valve 6, and power is supplied to the heater 7 from an AC power source 9 via a switch 8. , a room temperature sensor 10 is placed indoors 4, and a panel temperature sensor 11 is placed near the hot water panel 5 to detect the room temperature and panel temperature (floor temperature), and the temperature control circuit 12 is activated based on the room temperature and panel temperature. The switch 8 is opened and closed to turn the heater 7 on.
The room 4 is comfortably heated by controlling the energization to the thermoelectric valve 6, thereby opening and closing the thermal valve 6 to adjust the flow rate of hot water to the hot water panel 5, and controlling the panel temperature within a certain range according to the room temperature. I'm starting to do that.
In this case, the thermal valve 6 opens when heated by the heater 7 and closes when heating is stopped.

This hot water heating system has a second electrical circuit.
As shown in the figure, connect the AC power supply 9 to the power transformer PT
The voltage is stepped down by the power supply circuit E, and converted to a DC voltage by the power supply circuit E, and this DC voltage is connected to a room temperature sensor 10 such as an NTC thermistor.
and series circuit of resistor R ₃ and resistor R ₄ , variable resistor VR
In addition to the series circuit of the panel temperature sensor 11 such as an NTC thermistor, the reference voltage appearing at the connection point of the room temperature sensor 10 and the resistor _R3 is connected to the comparator.
The panel temperature detection voltage that is applied to the negative input terminal of CP and appears at the midpoint of variable resistor VR is connected to the comparator.
In addition to the positive input terminal of CP, the output voltage of comparator CP is fed back to its positive input terminal through feedback resistor _R2 , and is also applied to the base of switching transistor Tr via resistors _R1 and ^R5 . Power is supplied from the power supply circuit E via the transistor Tr to a switch driving means RY consisting of a relay, and the switch 8 is opened and closed by this switch driving means RY.

Note that SW is a power switch, and _D1 is a diode for surge absorption. Further, the room temperature sensor 10, the power switch SW, and the switch 8 are housed together with the temperature control circuit 12 in a control circuit box.

Next, the operation will be explained based on FIG. Immediately after the power is turned on, the panel temperature is very low, so the resistance value of the panel temperature sensor 11 is high as shown in Figure 3A, and the voltage V _P at the positive input terminal of the comparator CP, that is, the panel temperature detection voltage. The third one
As shown in Figure B, the voltage V _M at the negative input terminal is higher than the reference voltage, the output voltage of the comparator CP becomes H level, and the switching transistor
When the Tr is turned on, the switch drive means RY is energized, the switch 8 is turned on, and the heater 7 is energized from the AC power supply 9, causing the heater 7 to generate heat, which causes the thermal valve 6 to gradually begin to open. After about a minute has passed, the thermal valve 6 is completely opened. By opening this thermal valve 6, hot water circulates through the hot water panel 5, the panel temperature gradually increases, and the panel temperature sensor 1
As the resistance value of 1 becomes smaller, the voltage V _P drops.

Then, when V _P < V _M at time t ₁ , the output voltage of the comparator CP becomes L level, and
The voltage V _P drops by the feedback amount A ₁ due to the feedback resistor R ₂ , the switching transistor Tr is turned off, and the energization to the switch driving means RY is stopped, and the switch 8 is turned off, causing the heater 7 to generate heat. stopped,
The thermal valve 6 gradually begins to close, and after about two minutes has passed, the thermal valve 6 is completely closed. Until time _t2 when the thermal valve 6 is completely closed, hot water circulates through the hot water panel 5, the panel temperature continues to rise, and the voltage V _P continues to fall.

When the thermal valve 6 is completely closed at time _t2 , the panel temperature begins to decrease and the voltage V _P gradually increases.

When V _P > V _M at time t ₃ , the output voltage of the comparator CP becomes H level and the voltage V _P rises by the feedback amount A ₁ due to the feedback resistor R ₂ , and the switching transistor Tr turns on and switches. The driving means RY is energized, the switch 8 is turned on, the heater 7 generates heat, the thermal valve 6 gradually begins to open, and after about 2 minutes, the thermal valve 6 is completely opened. Until the time _t4 when the thermal valve 6 is completely opened, the amount of hot water circulating in the hot water panel 5 is small and the panel temperature continues to fall, and the voltage V _P continues to rise.

When the thermal valve 6 is completely opened at time _t4 , the panel temperature begins to rise and the voltage V _P gradually decreases.

When V _P < V _M at time _t5 , the output voltage of the comparator CP becomes L level, the voltage V _P decreases by the feedback amount _A1 due to the feedback resistor _R2 , and the switching transistor Tr is turned off. The switch driving means RY is energized, the switch 8 is turned off, the heater 7 stops generating heat, the thermal valve 6 gradually begins to close, and after about 2 minutes has passed, the thermal valve 6 is completely closed.

Thereafter, the operation is the same as above, and the panel temperature is controlled based on the room temperature. If the room temperature rises, the voltage V _M increases, and unless the voltage V _P becomes larger, the comparator CP will be inverted. The panel temperature is controlled to a low temperature. This control temperature can be changed by adjusting the variable resistor VR.

However, such conventional hot water heating systems cannot sensitively transmit changes in panel temperature to the operation of the thermal valve 6, and there is a large difference between the maximum and minimum panel temperatures during temperature control. There were flaws. Specifically, it takes about 2 minutes for the temperature control circuit 12 to output an off signal, stop energizing the heater 7 adjacent to the thermal valve 6, and completely close the thermal valve 6. In reality, hot water at a constant temperature continues to flow for two minutes after the off signal is generated, and the panel temperature continues to rise even after the off signal is generated. Conversely, it takes about 2 minutes from when the ON signal is output and the heater 7 adjacent to the thermal valve 6 starts to be energized until the thermal valve 6 is completely opened. The valve train 6 is often installed outdoors 1, and even when the thermal valve 6 is opened, cold water initially circulates from the thermal valve 6 to the hot water panel 5.
There was a problem with thermal response, which meant that it did not warm up quickly. That is, the thermal valve 6 is opened and closed by an electrical signal to flow hot water to the hot water panel 5, but there is a time delay between the electrical on/off and the opening/closing of the thermal valve 6, and the panel temperature The disadvantage is that the difference (fluctuation range) between the highest and lowest values becomes large, making it impossible to perform comfortable temperature control. This problem is caused not only by the poor responsiveness of the thermal valve 6 but also by the fact that the hot water temperature is a constant high temperature (approximately 80° C.).
That is, since the water heater 2 is used not only for the hot water panel 5 but also for other purposes, it is not possible to configure a system for controlling the hot water temperature.

[Purpose of the invention]

An object of the present invention is to provide a hot water heating system that can perform comfortable temperature control by reducing the fluctuation range of panel temperature.

[Disclosure of the invention]

The hot water heating system of the present invention includes a water heater, a hot water panel to which hot water is supplied from the water heater, a thermal valve interposed in a water supply channel from the water heater to the hot water panel, and the thermal valve. A heater that heats the heater, a switch that starts and stops energizing the heater, a panel temperature sensor that detects the temperature of the hot water panel, and a panel temperature detection voltage detected by this panel temperature sensor compared with a reference voltage. The temperature of the hot water panel is controlled within a certain range by having a comparator, a feedback resistor for giving the comparator a hysteresis characteristic, and a switch driving means for driving the switch on and off in response to the output of the comparator. a temperature control circuit, a heating resistor connected in parallel to the heater, and a thermal valve operation delay correction temperature sensor that is thermally coupled to the heating resistor and connected in parallel to the panel temperature sensor to advance the reversal timing of the comparator. It is equipped with the following.

According to the configuration of the present invention, a heat generating resistor is connected in parallel to the heater, a temperature sensor for correcting thermal valve operation delay is thermally coupled to the heat generating resistor, and a temperature sensor for correcting thermal valve operation delay is connected to the panel temperature sensor. Since they are connected in parallel, the inversion timing of the comparator can be advanced, and as a result, the range of fluctuation in the control temperature can be reduced to achieve comfortable temperature control.

Embodiment An embodiment of the present invention will be described based on FIGS. 4 and 5. That is, as shown in FIG. 4, this hot water heating system connects a series circuit of resistors R _c and R _b in parallel with the panel temperature sensor 11,
A temperature sensor S such as an NTC thermistor for compensating for thermal valve operation delay is connected in parallel to the resistor R _b , and the switch 8
responds to on/off with almost no delay
Connect a heat generating resistor R _a of about 2W, and this heat generating resistor R _a
is thermally coupled to a temperature sensor S for correcting thermal valve operation delay. The other configurations are the same as the conventional example.

Next, the operation will be explained based on FIG. Immediately after the power is turned on, the panel temperature is low, so the resistance value of the panel temperature sensor 11 is high, and the resistance value of the thermal valve operation delay correction temperature sensor S is also high, so that the positive input voltage V _P of the comparator CP, that is, the panel temperature sensor 11 is high. The temperature detection voltage is higher than the voltage V _M at the negative input terminal, that is, the reference voltage, the output voltage of the comparator CP becomes H level, and the switching transistor
When the Tr is turned on, the switch drive means RY is energized, and the switch 8 is turned on, and the heater 7 and the heating resistor R _a are energized by the AC power supply 9, and the heater 7 is turned on.
The heating resistor R _a generates heat, which causes the thermal valve 6 to gradually begin to open, and after about 2 minutes, the thermal valve 6 opens completely. When the thermal valve 6 opens, hot water circulates through the hot water panel 5, the panel temperature gradually rises, and the resistance value of the panel temperature sensor 11 decreases as shown in FIG. 5A. Furthermore, as the heating resistor R _a starts to generate heat, the resistance value of the thermal valve operation delay correction temperature sensor S also decreases as shown in FIG. 5B. As a result, the voltage _V'P drops.

Then, when V' _P < V _M at time t' ₁ , the output voltage of the comparator CP goes to L level, and
As shown in FIG. 5C, the voltage _V'P drops by the feedback amount _A1 due to the feedback resistor _R2 , the switching transistor Tr is turned off, the current supply to the switch driving means RY is stopped, and the switch 8 is turned off. As a result, the heater 7 and the heating resistor R _a stop generating heat. The thermal valve 6 gradually begins to close as the heater 7 stops generating heat, but until the thermal valve 6 is completely closed, hot water continues to flow through the hot water panel 5 and the panel temperature continues to rise, causing the panel temperature sensor 11 to rise. The resistance value continues to decrease as shown in FIG. 5A. On the other hand, the temperature of the heating resistor R _a begins to drop due to the stop of heating of the heating resistor R _a .
The resistance value of the thermal valve operation delay correction temperature sensor S begins to increase as shown in FIG. 5B. As a result, the voltage _V'P starts to rise after time _t'1 even though the resistance value of the panel temperature sensor 11 decreases (panel temperature increases).

When the thermal valve 6 is completely closed at time t' ₂ , the panel temperature begins to decrease and the resistance value of the panel temperature sensor 11 begins to increase.

When V′ _P > V _M at time t′ ₃ , the comparator CP
As the output voltage of the switch becomes L level, the voltage _V'P rises by the feedback amount _A1 due to the feedback resistor _R2 , the switching transistor Tr is turned on, and energization to the switch driving means RY is started, and the switch 8 is turned on. When turned on, the heater 7 and the heating resistor R _a start generating heat. The thermal valve 6 is activated by the start of heat generation from the heater 7.
starts to open gradually, but the panel temperature continues to fall and the resistance value of the panel temperature sensor 11 continues to increase until the thermal valve 6 is completely opened. On the other hand, the heating resistance
As R _a starts to generate heat, the temperature of the heat generating resistor R _a begins to drop, and the resistance value of the thermal valve operation delay correction temperature sensor S begins to decrease. As a result, the voltage _V'P starts to decrease after time _t'3 despite the increase in the resistance value of the panel temperature sensor 11.

When the thermal valve 6 is completely opened at time t' ₄ , the panel temperature begins to rise and the resistance value of the panel temperature sensor 11 begins to decrease.

When V′ _P < V _M at time t′ ₅ , the comparator CP
As the output voltage of the switch becomes H level, the voltage _V'P decreases by the feedback amount _A1 due to the feedback resistor _R2 , the switching transistor Tr is turned off, the current supply to the switch driving means RY is stopped, and the switch 8 is turned off. The heater 7 and the heating resistor R _a stop generating heat. The thermal valve 6 gradually begins to close as the heater 7 stops generating heat, but the panel temperature continues to rise and the resistance value of the panel temperature sensor 11 continues to decrease until the thermal valve 6 is completely closed. On the other hand, the heating resistance
As the heat generation of R _a stops, the temperature of the heat generating resistor R _a begins to decrease, and the resistance value of the thermal valve operation delay correction temperature sensor S begins to increase. As a result, the voltage _V'P starts to rise after time ^t'5 despite the decrease in the resistance value of the panel temperature sensor 11.

From then on, it operates in the same way. The operation of the room temperature sensor 10 is similar to that of the conventional example.

Note that the broken lines in FIGS. 5A and 5C indicate the resistance value and voltage V _P of the panel temperature sensor 11 in the conventional example.

In this way, in this embodiment, the temperature sensor S for correcting thermal valve operation delay detects the temperature change of the heat generating resistor R _a that immediately starts and stops generating heat in response to the on/off of the switch 8, and The resistance value of the temperature sensor S for valve operation delay correction is measured using the panel temperature sensor 1.
By combining the resistance values of 1 and 1, the reversal time of the comparator CP is made earlier than when using only the panel temperature sensor 11, which reduces the difference between the highest and lowest panel temperatures during temperature control, making it more comfortable. temperature control.

In the above embodiment, by obtaining the reference voltage from the connection point between the room temperature sensor 10 and the resistor _R3 , the reference voltage is changed in accordance with changes in the room temperature, and the temperature of the hot water panel 5 is corrected in accordance with the room temperature. Although the temperature control is always performed optimally regardless of changes in the room temperature, it goes without saying that the reference voltage may be constant.

〔Effect of the invention〕

According to the hot water heating system of the present invention, a heating resistor is connected in parallel to the heater, a temperature sensor for correcting thermal valve operation delay is thermally coupled to the heating resistor, and a temperature sensor for correcting thermal valve operation delay is thermally coupled to the heating resistor. Since the temperature sensors are connected in parallel, the inversion timing of the comparator can be advanced, and as a result, the range of fluctuation in the control temperature can be reduced and comfortable temperature control can be performed.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional hot water heating system, Figure 2 is its electrical circuit diagram, Figure 3A is a characteristic diagram showing the resistance value change of the panel temperature sensor, and Figure 3B is the waveform of the comparator input voltage. Figure 4 is an electric circuit diagram of a hot water heating system according to an embodiment of the present invention, Figures 5A and B are characteristic diagrams showing resistance value changes of each sensor, and Figure 5C is a waveform diagram of comparator input voltage. It is. 2...Water heater, 3...Pipe, 5...Hot water panel, 6...Thermal valve, 7...Heater, 8...Switch, 11...Temperature sensor for panel, 12...Temperature control circuit, S ...Temperature sensor for compensating for thermal valve operation delay, R _a ...Heating resistance, RY ...Switch driving means.

Claims (1)

[Claims] 1. A water heater, a hot water panel to which hot water is supplied from the water heater, a thermal valve interposed in a water supply channel from the water heater to the hot water panel, a heater that heats the thermal valve, and Start energizing the heater.
A switch to stop, a panel temperature sensor that detects the temperature of the hot water panel, a comparator that compares the panel temperature detection voltage detected by this panel temperature sensor with a reference voltage, and a feedback resistor that provides hysteresis characteristics to this comparator. and a temperature control circuit that controls the temperature of the hot water panel within a certain range by having a switch driving means that turns on and off the switch in response to the output of the comparator, and a heat generating resistor connected in parallel to the heater. A hot water heating system comprising: a thermal valve operation delay correction temperature sensor that is thermally coupled to the heating resistor and connected in parallel to the panel temperature sensor to advance the reversal timing of the comparator.