JPS6313111B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating control device for a hot water storage water heater using a heat source such as a gas burner.

Conventional hot water storage water heaters are equipped with a heating control device that detects the temperature at a certain fixed point in the hot water storage tank with a temperature detection sensor and controls the heating operation of the heat source so that the detected temperature remains constant. Since such conventional devices target the temperature of the entire hot water tank, they have the drawback of storing unnecessary hot water and wasting energy.

The present invention has been made in view of the above-mentioned drawbacks.
The purpose is to provide a heating control device for a hot water storage water heater that can easily select and set the required amount of hot water depending on the time of day and save energy without storing unnecessary hot water.

The present invention will be explained below with reference to Examples. Figure 1 shows a schematic diagram of the hot water storage water heater H used in this embodiment. In the figure, 1 is a hot water tank, and tap water is supplied to this hot water tank 1 from an inlet pipe 2 via a pressure reducing valve, etc. The hot water can be supplied from the hot water pipe 3 to the hot water supply equipment. Reference numeral 4 denotes a circulation path for forcibly circulating the hot water in the hot water storage tank 1, in which the hot water taken in from the water inlet 5 opened at the bottom of the hot water storage tank 1 is forcibly circulated by a pump 7. The circulating flow rate by the pump 7 is controlled so that it decreases when the set temperature is high and increases when the set temperature is low. 8 is an external heat exchanger heated by a gas burner 9, and this external heat exchanger 8 is connected to the circulation path 4 so as to heat hot water circulating through the circulation path 4.
It is located in the middle of the. Hot water heated to a set temperature is returned to the hot water tank 1 through a hot water outlet 6 opened at the upper end of the hot water tank 1. In the figure, A ₁ to _{A 5} are thermistors that are temperature detection sensors arranged at regular intervals from the top to the bottom of the hot water storage tank 1 . The thermistors A ₁ to _{A 5} have both the function of detecting the amount of hot water and the function of detecting the temperature of the hot water.

Figures 2 to 4 show the hot water storage water heater H as described above.
This figure shows the circuit configuration of a heating control device added to the system. FIG. 2 shows the configuration of the hot water temperature detection circuit 10, in which a thermistor A ₁ is connected in series with a resistor R ₁₁ , and the voltage at the connection point is stabilized by a capacitor C ₁₁ and an operational amplifier _{11 1} is connected in series with a resistor R 11 . is applied to the positive input terminal of In addition, resistors R ₂₁ and R ₃₁ are connected to the negative input terminal of the operational amplifier ₁₁₁ .
A reference voltage divided by a series circuit of a variable resistor VR 11 and a variable resistor VR ₁₁ is applied. operational amplifier 11 ₁
A light emitting diode L ₁ is connected to the output side of the light emitting diode L 1 , and when the light emitting diode L ₁ is turned on, the transistor Tr ₁ becomes conductive and the display light emitting diode D _{1 is} turned on.
is starting to turn off. other thermistors
A ₂ to _{A 4} also have the same circuit configuration as the thermistor A ₁ , with operational amplifiers 11 ₂ to 11 ₅ , transistors Tr ₂ to Tr ₅ , and light emitting diode L ₁ respectively.
~ _L5 , _D1 ~ _D5, etc. are provided.

Next, Figure 3 shows timer IC 12 and selection switch 1.
3 ₀ to 13 ₅ , and the phototransistors Q ₁ to Q ₅ in the figure correspond to the light emitting diodes L ₁ to L ₅ in the circuit in FIG. 2, respectively.
is optically coupled to. Each selection switch 13 ₀ to 1
₃₅ is composed of a rotary switch with 1 circuit and 5 contacts, and each of the 5 switching contacts of each contact switch ₁₃₀ to ₁₃₅ is equipped with a phototransistor.
The outputs of Q ₁ to _{Q 5} are applied. The common contacts of each selection switch 13 ₁ -13 ₅ are connected to phototransistors Q ₆ -Q ₁₀ , respectively, and the common terminal of selection switch 13 ₀ is connected to switch 14 ₁ . This switch 14 ₁ is a manual/automatic changeover switch that is interlocked with the switch 14 ₂ , and is in a manual control state in the state shown in FIG. 3 .
In this manual control state, the terminal _T1 is grounded via the switch ₁₄₂ , so the terminal _T'1 connected to the terminal _T1 becomes I level, and the timer IC
Since the reset terminal R of 12 is at L level, the timer IC 12 is stopped. On the other hand, switch 14 ₁
The voltage level at the connection point _J1 between the resistor _R4 and the resistor R4 is determined by the output of the phototransistor _Q1 to _Q5 selected by the selection switch ₁₃₀ ,
The voltage at this connection point J ₁ is applied to the base of the transistor Tr ₆ via OR circuits OR ₁ and OR ₃ .
A relay RY ₁ is connected to the collector side of the transistor Tr ₆ , and the on/off operation of this relay RY ₁ drives the control valve 9a of the gas burner 9 to open/close to control the water temperature.

Next, when the manual automatic changeover switches 14 ₁ and 14 ₂ are switched to the automatic control state, the terminal T ₂ is connected to the switch 1.
₄₂ , the potential of the terminal _T'2 connected to the terminal _T2 becomes 0, and the display light emitting diode _D6 lights up to indicate the automatic control state. Also, since the terminals T ₁ and T' ₁ are no longer grounded, the potential of the reset terminal R of the timer IC12 becomes H level by the resistor _R5 , and the potential of the reset terminal R of the timer IC12 becomes H level.
2 starts. Timer IC12 has a built-in subtraction counter, and in the initial state, the output terminal
S ₀ to _{S 5} are all at H level, and the light emitting diode
All L ₆ to _{L 10} are lit, but as time passes, the output terminal S ₀ becomes L level first, and then the output terminals S ₁ , S _{3 .} . . , S ₅ sequentially become L level. There is. Further, the operating time of this timer IC 12 can be freely set by changing the values of resistors R ₆ and R ₇ and capacitors C ₂ and C ₃ . Each light emitting diode L ₆ -L ₁₀ is connected to a phototransistor Q ₁₁ - of the switching control circuit 15 shown in FIG.
Each is optically coupled to _Q15 . However, when all the light emitting diodes L ₆ to L ₁₀ are lit in the initial state, the phototransistor Q ₁₁
~ All emitter outputs of Q ₁₅ are at H level,
Therefore, the outputs of the inverters _I1 to _I4 are all at the L level, and therefore the outputs of the AND circuits _AD1 to _AD4 are all at the L level. For this reason the transistor
Tr ₁ is turned on and the light emitting diode L ₁₁ is turned on, but the transistors Tr ₈ to _{Tr 11} are all turned off and the light emitting diodes L ₁₂ to _{L 15} are all turned off.
_The light-emitting diodes L ₁₁ -L ₁₅ are optically coupled to the phototransistors Q _{6 -Q 10} of the circuit of FIG _. All are not conductive. The emitter outputs of each phototransistor Q ₇ to _{Q 10} are applied to the base of the transistor Tr ₆ via OR circuits OR ₁ , OR ₂ and OR ₃ , respectively, and therefore in this case the selection switch 13 ₁ The output of will be applied to the base of transistor _Tr6 .

Next, when the timer IC ₁₂ continues counting and the output terminals S ₁ and S ₀ become L level, only L ₆ of the light emitting diodes L ₆ to _{L 10} goes out, so the phototransistors Q ₁₁ to _{Q 15} Among the emitter outputs of Q11, only the emitter output of _Q11 becomes L level.
Therefore, the transistor _Tr7 is turned off and the light emitting diode _L11 is turned off. Further, since the output of the inverter _I1 becomes H level, the output of the AND circuit _AD1 becomes H level, the transistor _Tr8 is turned on, and the light emitting diode _L12 is lit. Furthermore, since the outputs of the inverters I ₂ to _{I 4} are at L level, the outputs of the AND circuits AD ₂ to AD ₄ are at L level, transistors Tr ₉ to _{Tr 11} are turned off, and light emitting diodes L ₁₃ to L ₁₅ are turned off. do. Therefore, only _L12 of each of the light emitting diodes _L11 to _L15 lights up, thereby making the phototransistor _Q7 conductive and applying the output of the selection switch ₁₃₂ to the base of the transistor _Tr6 . become.

Similarly, the output terminals S ₂ , S ₃ ,
When S ₄ becomes L level in order, the light emitting diode L ₁₃ ,
L ₁₄ and L ₁₅ light up sequentially, and phototransistor Q ₈ ,
Q ₉ and Q ₁₀ become conductive in sequence, and selection switches 13 ₃ to 1
₃₅ outputs are sequentially applied to the base of transistor _Tr6 . Furthermore, when the output terminal _S5 becomes L level, each of the light emitting diodes _L6 to _L10 and _L11 to _L15 goes out, and each phototransistor _{Q6 Q10} ceases to conduct. Further, the count end output terminal E of the timer IC 12 becomes H level, and the transistor Tr ₁₂ is turned on, so that the terminal T ₃ becomes L level. Therefore, the terminal T' ₃ connected to the terminal T ₃ is at L level, and the transistor Tr ₆ is turned off. As a result, the relay Ry ₁ is turned off, and the gas burner 9 is stopped.

Next, 16 is a regulator IC, which has terminals T ₄ ,
The DC voltage applied between _T5 is stabilized to obtain the power supply voltage _VCC . Further, capacitor C ₄ is a smoothing capacitor, and capacitors C ₅ and C ₆ are noise removing capacitors. 17 is a timer
This is a switch that turns on and off the power supply to the IC 12, light emitting diodes _L6 to _L10 , etc. When this switch 17 is turned on, the light emitting element 1
8 lights up and relay Ry ₂ is activated.

Next, the operation of this embodiment will be explained. First, when water is stored in the hot water storage tank 1, the temperature of each thermistor _A1 to _A5 is low, and therefore their resistance value is _high .
The voltage level of the positive input terminal of ₁₁₅ becomes high. Therefore, the output of operational amplifiers 11 ₁ to 11 ₅ is H
level, the light emitting diodes L ₁ to L ₅ light up,
The display light emitting diodes D ₁ to _{D 5} are turned off. Therefore, when the manual automatic changeover switches 14 ₁ and 14 ₂ are switched to the manual side and the selection switch 13 ₀ is connected to, for example, the phototransistor Q ₃ , the phototransistor Q ₃ is conductive due to the lighting of the light emitting diode L ₃ . , an H level signal is input to the base of the transistor Tr ₆ , the transistor Tr ₆ is turned on, and the relay Ry ₁ is operated. Relay Ry ₁
When operated, the control valve 9a opens, the gas burner 9 is ignited, and the external heat exchanger 8 is heated. At this time, the pump 7 for forced circulation is started, and the water taken in from the water inlet 5 at the bottom of the hot water storage tank 1 is supplied to the external heat exchanger 8. Hot water from the external heat exchanger 8 is circulated through the circulation path 4
The hot water is supplied to the hot water outlet 6 at the upper part of the hot water storage tank 1 through the hot water tank 1.
The hot water thus supplied into the hot water storage tank 1 is stored downward from the top of the hot water storage tank 1. Therefore, hot water is accumulated in the top of the hot water storage tank 1, and the hot water is stored in the hot water storage tank 1 downward. Cold water will accumulate at the bottom, and the interface between them is the thermistor.
When the temperature falls below _A3 , the temperature of the thermistors _A1 to _A3 becomes high, so the light emitting diodes _L1 to _L3 are turned off, and the display light emitting diodes _D1 to _D3 are turned on. Therefore, the remaining amount of hot water can be displayed by these light emitting diodes _D1 to _D3 . Furthermore, when the light emitting diode _L3 goes out, the phototransistor _Q3 becomes non-conductive, so the transistor
The base potential of Tr ₆ becomes L level, transistor Tr ₆ is turned off, relay Ry ₁ stops operating, and gas burner 9 and pump 7 stop. Therefore, the amount of hot water stored in this case is from the top of the hot water storage tank 1 to the position of thermistor _A3 . When hot water is supplied in this state, hot water from the upper part of the hot water storage tank 1 is discharged from the hot water outlet pipe 3, and tap water is supplied from the water inlet pipe 2 via a pressure reducing valve or the like to supplement the amount of hot water discharged. When the amount of hot water in the hot water storage tank 1 decreases due to this hot water supply operation and the temperature of the thermistor _A3 decreases, the light emitting diode _L3 lights up again, the phototransistor _Q3 becomes conductive, and the transistor _Tr6
is turned on, relay Ry ₁ is activated, gas burner 9 and pump 7 are activated to heat the cold water in the lower part of hot water storage tank 1 and supply it to the upper part of hot water storage tank 1.
By the way, if _the amount of hot water used is particularly large, the _hot water stored in the hot water storage tank ₁ will be used up quickly. Switch to
Store hot water up to thermistors _A4 and _A5 . When the amount of hot water to be used is small, the selection switch ₁₃₀ is switched to the phototransistor _Q1 , _Q2 side to store hot water up to the thermistor _A1 , _A2 position to reduce the amount of hot water stored, allowing natural heat radiation to be used. This reduces energy loss.

Next, the operation when the manual and automatic changeover switches 14 ₁ and 14 ₂ are switched to the automatic side to set the automatic control state will be described. FIG. 5 shows the selection switch 13 ₁ ~
This shows the operation panel 17' for setting ₁₃₅ , that is, ₁₆₁ to ₁₆₅ are selection switches 1
It is linked with 3 ₁ to 13 ₅ . First, the knob 16 ₁ is used to set the control state from 0 hours to 2 hours after the start of automatic operation, and this knob 16 ₁ is set at a position where thermistor A ₄ is selected.
Therefore, as shown in FIG. 6, the amount of hot water from 0 hours to 2 hours after the start of automatic operation is the amount of hot water from the top of the hot water storage tank 1 to the position of thermistor _A4 . Similarly, the knobs 16 ₂ to 16 ₅ are used to set the control status every two hours, and the knobs 16 _{2 to} 16 5 respectively set the control status every two hours.
16 _{and 5} are set at positions that select thermistors A ₃ , A ₁ , A ₅ , and A _4, respectively, so that the amount of hot water stored in the hot water tank 1 changes every two hours as shown in Figure 6. It's summery. Then, when 10 hours have passed since the start of automatic operation, the count end output terminal E of the timer IC 12 becomes H level as described above, so the transistor Tr ₁₂ is turned on and the transistor Tr ₆ is forcibly turned off. Relay Ry ₁ does not operate, gas burner 9 and pump 7 cease to operate, and therefore the amount of hot water becomes zero. As is clear from the above operation description, the knobs 161 to ₁₆ are linked to the respective selection switches ₁₃₁ to ₁₃₅ .
By operating ₁₆₅ , the amount of hot water stored within 10 hours after starting automatic operation can be freely set every two hours.

The present invention is configured as described above, and includes a hot water storage tank, a circulation path for forcibly sending hot water in the hot water storage tank to the upper part of the hot water storage tank, and a circulation path provided in the middle of the circulation path to heat the hot water passing through the circulation path. A hot water storage water heater comprising an external heat exchanger that heats the external heat exchanger and a heat source that heats the external heat exchanger; a plurality of selection switches that selectively output the temperature detection outputs of these temperature detection sensors, a timer switching means that sequentially switches and outputs the respective temperature detection outputs output from these selection switches at predetermined time intervals; Based on the temperature detection output output from the temperature detection sensor selected by the switch and timer switching means, the heating operation of the heat source is controlled so that the temperature near the temperature detection sensor reaches a preset temperature. Since it is equipped with heating control means, it is possible to arbitrarily select the water level at which the temperature is to be detected and to sequentially change the selected time period. The only thing you need to do is to ensure the amount of hot water.
It has the advantage that there is no wasted amount of hot water, and there is less loss due to heat radiation, and as a result, less energy is required for heating, making it possible to reduce fuel consumption. It has the advantage that anyone can easily handle it because the required amount of hot water can be set.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of a hot water storage water heater used in an embodiment of the present invention, FIGS. 2 to 4 are circuit diagrams of the heating control device described above, and FIG. 5 is a diagram of the heating control device described above. A front view showing a part of the operation panel, and FIG. 6 are operation explanatory diagrams of the same as above. 1 is a hot water storage tank, 4 is a circulation path, 8 is an external heat exchanger,
9 is a gas burner, 12 is a timer IC, 13 ₁ to 13 ₅
is a selection switch, _A1 to _A5 are thermistors, _Tr6 is a transistor, and _Ry1 is a relay.

Claims (1)

[Claims] 1. A hot water storage tank, a circulation path that forcibly sends the hot water in the hot water storage tank to the upper part of the hot water storage tank, an external heat exchanger that is installed in the middle of the circulation path and heats the hot water that passes through the circulation path, and the external heat exchanger. A hot water storage water heater configured with a heat source that heats a water storage tank, a plurality of temperature detection sensors provided at predetermined intervals in the depth direction in the hot water storage tank, and temperature detection outputs of these temperature detection sensors, respectively. a plurality of selection switches for selectively outputting a plurality of selection switches; a timer switching means for sequentially switching and outputting the respective temperature detection outputs outputted from these selection switches at predetermined time intervals; and a temperature selected by the selection switch and the timer switching means. and heating control means for controlling the heating operation of the heat source so that the temperature near the temperature detection sensor reaches a preset temperature based on the temperature detection output output from the detection sensor. A heating control device for a hot water storage water heater.