JPH0510593A - Hot water supply controller for heat source apparatus - Google Patents

Abstract

PURPOSE:To cope with the case where a lowest combustion capacity is increased or decreased according to burning characteristic of a heat source apparatus or the case where a temperature of inputting water is varied, and to prevent boiling at an igniting water flow rate. CONSTITUTION:This hot water supply controller comprises an igniting water flow rate setter 12 for varying setting of an igniting water flow rate, a control circuit 13 inputting an output signal of the setter 12 and an output signal of an input water flow rate detector 3 to compare them to judge, and a hot water supply control circuit 14 for controlling to supply hot water according to the output of the circuit 13. The setter 12 is replaced with a lowest burning capacity circuit, further both the setter 12 and the lowest burning capacity circuit are provided, and either one of them is selectively formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply control device for a heat source device such as a hot water supply device.

[0002]

2. Description of the Related Art Conventionally, in a hot water supply control device for a heat source device, for example, a hot water supply control device for a water heater, a flow rate sensor is provided in an inlet channel, and the number of pulses from the flow rate sensor, the pulse period, or those are converted into analog quantities. When the output signal is compared with the set value set in the hot water supply control circuit and it is determined that the flow rate signal from the flow rate sensor has reached the ignition condition determination level corresponding to the set value, the hot water supply control function is activated by the ignition device. An ignition command was issued to heat the fluid to be heated.

[0003]

Generally, in a heat source machine such as a water heater, even if the burner is the same, its combustibility changes depending on the type of gas, so that the minimum combustion capacity of the water heater increases or decreases, and Is constantly changing. However, in the above conventional heat source machine control device, since the ignition water amount set value is preset and fixed for each product, the ignition condition determination level corresponding to the set value is also fixed, and therefore, the combustibility However, if the minimum combustion capacity of the water heater is increased due to the combustibility or if the incoming water temperature rises, there is a problem that the amount of ignition water boils. Therefore, an object of the present invention is to increase or decrease the minimum combustion capacity of the heat source device due to the combustibility, or when the incoming water temperature changes, in the heat source device that does not boil with the amount of ignition water or the outlet water temperature does not exceed a predetermined temperature. It is to provide a hot water supply control device.

[0004]

In order to solve the above-mentioned problems, a hot water supply control device for a heat source machine according to the present invention is an ignition water amount setting circuit capable of arbitrarily setting an ignition water amount setting value, and an ignition water amount setting thereof. Consists of a control circuit that compares and determines the ignition water amount set value set by the circuit with the output signal of a flow rate detector that detects the flow rate of the fluid to be heated, and a hot water supply control circuit that performs hot water supply control by the output signal of the control circuit. Has been done. Also, a minimum combustion capacity setting circuit that sets the minimum combustion capacity,
From the output signal of the minimum combustion capacity setting circuit and the output signal of the hot water supply temperature setting device that sets the hot water supply temperature, the flow rate detector that detects the flow rate of the heated fluid, and the incoming water temperature detector that detects the incoming water temperature of the heated fluid A control circuit that calculates the minimum flow rate that does not cause boiling or the hot water temperature does not exceed a predetermined temperature and compares the calculation result with the output signal of the flow rate detector, and hot water supply control by the output signal of the control circuit It is composed of a hot water supply control circuit.

Further, an ignition water amount setting circuit capable of arbitrarily setting an ignition water amount setting value, an output signal of a flow rate detector for detecting a flow rate of a fluid to be heated, and an ignition water amount setting set by the ignition water amount setting circuit. With a control circuit for comparing and judging the value, the minimum combustion capacity setting circuit for setting the minimum combustion capacity, the output signal of the minimum combustion capacity setting circuit and the hot water supply temperature setting device for setting the hot water temperature, Calculate the minimum flow rate that does not cause boiling or the hot water temperature does not exceed a predetermined temperature from the output signals of the flow rate detector that detects the flow rate and the input water temperature detector that detects the incoming water temperature of the fluid to be heated.
A control device for a heat source machine, comprising a control circuit for comparing and judging the calculation result and an output signal of the flow rate detector, and further comprising a hot water supply control circuit for performing hot water supply control by the output signal of the control circuit, wherein the ignition water amount is Either the setting circuit or the minimum combustion capacity setting circuit is formed to be selectable.

[0006]

EXAMPLES The construction of the hot water supply control device for a heat source machine of the present invention will be described below by way of examples. Figure 2 is a schematic diagram of the water heater,
The water inlet 2 connected to the heat exchanger 1 is provided with a water amount detector 3 for detecting the flow rate of the fluid to be heated and a water temperature detector 4 for detecting the water temperature of the fluid to be heated. The hot water outlet temperature detector 6 is provided in the hot water outlet passage 5 from the vessel 1, the proportional valve 9 for controlling the combustion amount is provided in the gas passage 8 to the burner 7 for heating the heat exchanger 1, and the hot water supply temperature A temperature setting device 10 for setting is set. Then, a hot water supply control device 11 which inputs necessary signals from the incoming water amount detector 3, the incoming water temperature detector 4, the temperature setting device 10 and the like to perform comparison judgment and calculation, and outputs a control signal to the gas proportional valve 9 according to the result. Is provided.

The hot water supply control device 11 has a circuit as shown in FIG. That is, the ignition water amount setting circuit 12 capable of arbitrarily setting the ignition water amount setting value, and the control circuit 13 for inputting the output signal of the ignition water amount setting circuit 12 and the output signal of the water amount detector 3 to make a comparison judgment. And a hot water supply control circuit 14 for controlling hot water supply by the output of the control circuit 13.

The hot water supply control device 11 of the hot water supply device configured as described above operates as follows. That is, the water amount detector 3
Detects the flow rate of the fluid to be heated supplied from the water inlet 2 and outputs the signal to the control circuit 13 of the hot water supply control device 11. On the other hand, when the ignition water amount setting circuit 12 sets the ignition water amount to a desired value, the set value is input to the control circuit 13. Then, the control circuit 13 compares the input signal from the water input amount detector 3 with the ignition water amount set value, and when it determines that the flow rate exceeds the ignition condition determination level corresponding to the ignition water amount set value, the control circuit 13 sends it to the hot water supply control circuit 14. By sending a signal, the hot water supply control circuit 14 issues a command to the igniter (not shown) and the frame rod (not shown), and ignition control and slow ignition control are performed.

Thereafter, the hot water supply control circuit 14 uses a feed-forward feedback with the incoming water temperature detector 4, the outgoing hot water temperature detector 6, the gas proportional valve 9, and the temperature setting device 10 so that the hot water supply temperature reaches and stabilizes at the set temperature. Controlled, the fluid to be heated is heated by the burner 7 and the heat exchanger 1, and hot water is supplied from a hot water tap (not shown) at the tip of the hot water discharge passage 5. When the hot water tap is closed and the flow rate decreases, the signal from the water input amount detector 3 decreases, and when the control circuit 13 determines that it is below the ignition condition determination level, it sends a signal to the hot water supply control circuit 14 to thereby control the hot water supply. The circuit 14 issues a burn stop command to the burner 7 to extinguish the fire. Therefore, even if the flow rate of the fluid to be heated is minimized, it is possible to perform control without boiling.

It should be noted that the ignition water amount setting circuit 12 is not limited to one that can be changed by a volume as shown in FIG. 1, but one that replaces the resistor 12a as shown in FIG. 3 or switches the resistor by a switch 12b as shown in FIG. Anything is fine.
In this way, the ignition water amount setting circuit 12 of the hot water supply control device 11
Can change the ignition water amount set value to a desired value by a variable resistance during use or during hot water supply. Therefore, the hot water supply control device 11 can cope with a change in incoming water temperature.
It prevents boiling with the amount of ignition water or exceeding a predetermined temperature.

FIG. 5 shows another embodiment 1 of the hot water supply control apparatus of the present invention.
Since the hot water supply control device 15 is arranged in the same circuit as the entire circuit diagram of the water heater shown in FIG. 2, the description of the entire circuit diagram will be omitted to avoid duplication. The hot water supply control device 15 is configured by replacing the ignition water amount setting circuit 12 with a minimum combustion capacity setting circuit 16 in the embodiment shown in FIG. 1, and is configured in detail as follows. That is, the hot water supply control device 15 includes a minimum combustion capacity setting circuit 16 for setting the minimum combustion capacity, an A / D conversion circuit 17 for A / D converting the set value set by the minimum combustion capacity setting circuit 16, and the A The minimum flow rate that does not cause boiling or does not exceed a predetermined temperature is calculated from the output signal of the D / D conversion circuit 17 and each output signal of the hot water supply temperature setting device 10, the incoming water amount detector 3, and the incoming water temperature detector 4, and the result of the operation is calculated. It comprises a control circuit 13 for comparing and judging the output signal of the flow rate detector 3 and a hot water supply control circuit 14 for performing hot water supply control by the output signal of the control circuit 13.

As described above, since the ignition water amount setting circuit 12 is replaced with the minimum combustion capacity setting circuit 16, the ignition condition determination level L [rise / min] of the ignition water amount is converted as follows. Now, the set value of the minimum combustion capacity is Out [kcal / min], and the temperature rise value at the time of the amount of ignition water is Tu [degree]
Then, L = Out / Tu [stand / min]. Also,
The extinguishing condition determination level may be the same as the ignition condition determining level, but a differential may be provided to prevent chattering. That is, if the ignition condition determination level of the amount of ignition water is Lon, the extinguishing condition determination level of the amount of ignition water is Loff, and the differential amount of ignition and extinction is Ldef, then Lon = Out / Tu [stand /
Min], Loff = Lon-Ldef [stand / min].

The hot water supply control device 15 of the hot water supply device configured as described above operates as follows. That is, the water amount detector 3
Detects the flow rate of the fluid to be heated supplied from the water inlet 2 and generates a signal Qx [rise / min] proportional to the flow rate,
Output to the control circuit 13. On the other hand, the minimum combustion capacity Out [kilocalories / minute] set by the minimum combustion capacity setting circuit 16 is A / D converted in the A / D conversion circuit 17 and output to the control circuit 13. This A / D conversion circuit 1
Although it is possible to omit 7 and output the analog value as it is to the control circuit 13, the processing by the microcomputer becomes easy by A / D conversion. Control circuit 13
Is the temperature T ₁ obtained from the incoming water temperature detector 4 [Celsius / degree]
And the set temperature T ₀ [Celsius / degree] of the hot water supply temperature setting device 10, the ignition water amount Qon [stand / min] and the extinguishing water amount Qoff [stand / min] calculated by the following equations are calculated. That is, Qon = Out / T ₀ −T ₁ Qoff = Qon−Qdef, where Qdef is the differential amount of the amount of ignition water and the amount of extinguishing water.

Based on the result of this calculation, the control circuit 13
Is compared with Qx [rise / min] obtained from the signal value of the water input amount detector 3 according to the following conditional expression to determine ignition or extinguishment, and output the determination result to the hot water supply control circuit 14. That is, Qon ≦ Qx (1) ... Ignition Qoff ≧ Qx (2) ... When the extinguishing ignition command condition (1) is satisfied, the hot water supply control circuit 14 A command is issued to an igniter (not shown) and a frame rod (not shown) to perform ignition control and slow ignition control.

After that, the hot water supply control circuit 14 carries out safety control to turn off the water, and at the same time, sets the incoming water temperature detector 4, the outgoing hot water temperature detector 6, the gas proportional valve 9 and the temperature setting so that the hot water supply temperature reaches the set temperature and becomes stable. The feedforward / feedback control is performed by the vessel 10, and the fluid to be heated is burner 7
Also, it is heated by the heat exchanger 1, and hot water is supplied from a hot water supply plug (not shown) at the tip of the hot water discharge passage 5. When the hot water tap is closed and the flow rate is reduced, the signal from the water input amount detector 3 is reduced, and when the fire extinguishing command condition (2) is satisfied, the control circuit 13 causes the hot water supply control circuit 1 to operate.
4, the hot water supply control circuit 14 issues a burn stop command to the burner 7 to extinguish the fire. Therefore, even if the flow rate of the fluid to be heated is minimized, it is possible to perform control such that boiling does not occur or the temperature does not exceed a predetermined temperature.

Incidentally, the minimum combustion capacity setting circuit 16 is not limited to the ignition water amount setting circuit 12 shown in FIG.
Alternatively, the resistance may be switched by a switch as shown in FIG. In this way, the minimum combustion capacity setting circuit 16 of the hot water supply control apparatus 15 can change the minimum combustion capacity to a desired value by a variable resistance each time it is used or as needed during boiling water. Therefore, the hot water supply control apparatus 15 can: It is possible to cope with the increase or decrease of the minimum combustion ability due to the change of the combustibility and the change of the incoming water temperature, and prevent the boiling point of the ignition water amount or the temperature exceeding the predetermined temperature.

FIG. 6 shows another embodiment 2 of the hot water supply controller according to the present invention.
The hot water supply controller 18 is arranged in a circuit similar to the entire circuit diagram of the water heater shown in FIG.
Further, the configuration of the hot water supply control device 18 has both components and functions of the embodiment shown in FIG. 1 and another embodiment 1 shown in FIG. Only those parts that are omitted and different will be described below. That is, the hot water supply control device 18 is provided with an ignition water amount setting circuit 12 and a minimum combustion capacity setting circuit 16, and a changeover switch 19 for switching between the two circuits.
With this changeover switch 19, the ignition water amount setting circuit 1
2 and the minimum combustion capacity setting circuit 16 are selectively used, but when the changeover switch 19 is connected to the contact of the ignition water amount setting circuit 12, the same operation and the same effect as those of the embodiment shown in FIG. When the changeover switch 19 is connected to the contact of the minimum combustion capacity setting circuit 16, the same operation and the same effect as those of the embodiment shown in FIG. 5 are achieved. for that reason,
In the present embodiment, hot water supply control can be performed by selecting either the amount of ignition water or the minimum combustion capacity and changing the set value according to the type of the heat source machine and the operating conditions, and thus it is a versatile hot water supply control. Can be widely used as a device.

[0018]

As described above, the hot water supply control apparatus for a heat source device according to the present invention includes an ignition water amount setting circuit capable of arbitrarily setting the ignition water amount setting value, the ignition water amount setting value and the flow rate detector. Since it is composed of a control circuit that compares and judges the output signal and a hot water supply control circuit that performs hot water supply control by the output signal of the control circuit, it is possible to cope with changes in the incoming water temperature and It is possible to prevent boiling or exceeding a predetermined temperature. In addition, the minimum combustion capacity setting circuit that sets the minimum combustion capacity, and the minimum value that does not cause boiling or exceed the specified temperature from the output signal of that circuit and each output signal of the hot water temperature setting device, flow rate detector, and incoming water temperature detector A control circuit for calculating the flow rate and comparing and judging the calculation result with the output signal of the flow rate detector, and a hot water supply control circuit for performing hot water supply control by the output signal of the control circuit, or a heat source device The hot water supply control device is provided with an ignition water amount setting circuit and a minimum combustion capacity setting circuit, and either of them can be selected, both of which increase or decrease the minimum combustion capacity due to the change of combustibility and change the incoming water temperature. It is possible to cope with the problem, and it is possible to prevent the boiling at the amount of the igniting water or the temperature exceeding the predetermined temperature.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention.

FIG. 2 is an overall circuit diagram of a water heater.

FIG. 3 is a circuit diagram of a modified example of an ignition water amount setting circuit.

FIG. 4 is a circuit diagram of a modified example of an ignition water amount setting circuit.

FIG. 5 is a circuit configuration diagram of another embodiment 1 of the present invention.

FIG. 6 is a circuit configuration diagram of another embodiment 2 of the present invention.

[Explanation of symbols]

1 ... Heat exchanger, 2 ... Water inlet, 3 ... Water inlet detector,
4 ・ ・ Inlet water temperature detector, 5 ・ ・ Outlet temperature detector, 6 ・ ・ Outlet temperature detector, 7 ・ ・ Burner, 8 ・ ・ Gas passage, 9 ・ ・ Proportional valve, 10
..Temperature setting devices, 11, 15, 18, ... Hot water supply control devices,
12 ・ ・ Ignition water amount setting circuit, 12a ・ ・ Resistance, 12b ・
・ Switch, 13 ・ ・ Control circuit, 14 ・ ・ Hot water supply control circuit, 16 ・ ・ Minimum combustion capacity setting circuit, 17 ・ ・ A / D conversion circuit, 19 ・ ・ Switch

Claims (3)

[Claims] 1. An ignition water amount setting circuit capable of arbitrarily setting an ignition water amount setting value, and an output of a flow rate detector for detecting an ignition water amount setting value set by the ignition water amount setting circuit and a flow rate of a fluid to be heated. A control circuit for comparing and judging the signal,
A hot water supply control device for a heat source machine, comprising: a hot water supply control circuit for performing hot water supply control by an output signal of the control circuit. 2. A minimum combustion capacity setting circuit for setting a minimum combustion capacity, a hot water supply temperature setting device for setting an output signal of the minimum combustion capacity setting circuit and a hot water supply temperature, a flow rate detector for detecting a flow rate of a fluid to be heated, A control circuit that calculates a minimum flow rate that does not exceed a predetermined temperature from each output signal of the incoming water temperature detector that detects the incoming water temperature of the fluid to be heated, and compares and determines the calculation result and the output signal of the flow rate detector, A hot water supply control device for a heat source machine, comprising: a hot water supply control circuit for performing hot water supply control by an output signal of the control circuit. 3. An ignition water amount setting circuit capable of arbitrarily setting an ignition water amount setting value, an output signal of a flow rate detector for detecting a flow rate of a fluid to be heated, and an ignition water amount setting set by the ignition water amount setting circuit. With a control circuit for comparing and judging the value, the minimum combustion capacity setting circuit for setting the minimum combustion capacity, the output signal of the minimum combustion capacity setting circuit and the hot water supply temperature setting device for setting the hot water temperature, Calculate the minimum flow rate that does not exceed a predetermined temperature from the output signals of the flow rate detector that detects the flow rate and the input water temperature detector that detects the incoming water temperature of the fluid to be heated, and calculate the result and the output signal of the flow rate detector. In the control device of the heat source device, which further comprises a hot water supply control circuit for performing hot water supply control by an output signal of the control circuit, the ignition water amount setting circuit or the minimum combustion capacity is provided. A control device for a heat source device, characterized in that any one of the force setting circuits is formed to be selectable.