JPH07198132A - Combustion device and its combustion function renewal operation method - Google Patents

Abstract

PURPOSE:To perform a combustion operation by obtaining a combustion function which is suitable for the actual conditions of a hot water supply apparatus by renewing a combustion function which is previously given to the hot water supply apparatus during the combustion operation successively. CONSTITUTION:During a combustion operation of a hot water supply apparatus, the temperature of incoming water, the temperature of outgoing hot water and the quantity of entering water are detected. When the temperature of outgoing hot water enters a previously given temperature deviation, the quantity of flowing water enters a previously given flow rate deviation range, and the operation quantity of a gas proportional valve 13 enters a previously given range, at a function renewal condition monitoring unit 26, the combustion function at the time of actual working is obtained by a function renewal operation unit 30, and the operation value is stored in a renewal data storage unit 36 as the paired data with a set temperature. This function renewal is successively performed, and the combustion function is kept renewing. At the time of next hot water supply, a hot water supply combustion operation is performed using a correct combustion function being stored in the data storage unit 36, which is suitable for the actual conditions of the water supply apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device such as a water heater and a combustion capacity updating operation method thereof.

[0002]

2. Description of the Related Art FIG. 7 shows a system configuration of a general water heater as a combustion device. In the figure, a water supply pipe 3 of water to be heated is connected to the inlet side of the heat exchanger 2, and the water supply pipe 3 is provided with a water input thermistor 10 as a temperature input detecting means for detecting the water input temperature. A flow rate sensor 9 as a flow rate detecting means for detecting the amount of water entering is provided.
The hot water supply pipe 4 is connected to the outlet side of the heat exchanger 2, and the hot water supply tap 1 is provided on the outlet side of the hot water supply pipe 4. further,
The hot water supply pipe 4 is provided with a water amount control valve 16 as a flow rate control unit whose valve opening amount is controlled by a gear motor, and a hot water thermistor 11 as a hot water outlet temperature detecting unit for detecting the hot water temperature.

Below the heat exchanger 2, a burner 7 as a combustion heating means, an igniter electrode 18 for igniting the burner 7,
A flame rod electrode 19 for detecting ignition and a combustion fan 5 for supplying / exhausting air are arranged, a gas nozzle 6 is arranged opposite to a gas inlet of the burner 7, and a gas pipe 8 leading to the gas nozzle 6 is provided with a gas. A gas proportional valve 13 as fuel supply control means for controlling the supply amount by the valve opening amount, and a gas solenoid valve 12 for opening and closing the pipeline are provided.

This type of water heater is provided with a control device 14, and a remote controller 15 is connected to the control device 14. The remote controller 15 has a temperature setting unit such as a button for setting the hot water temperature and hot water setting. A temperature display is provided. The controller 14 controls the hot water supply operation of the water heater, and when the hot water tap 1 is opened, the flow rate sensor 9 detects the amount of water input, and when the amount of water input exceeds a certain level (minimum operating flow rate). In response to the signal from the flow sensor 9, the controller 14 rotates the combustion fan 5. Then, when the rotation of the combustion fan 5 enters a predetermined rotation region, the gas solenoid valve 12 and the gas proportional valve 13 are opened to supply the gas to the burner 7, and the ignition operation by the igniter electrode 18 is performed. Frame rod electrode 19
When the gas ignition is detected, the control device 14 performs feedforward control so that the hot water temperature is set to the set temperature, the opening amount of the gas proportional valve 13 is varied, and the hot water temperature output from the heat exchanger 2 is set to the set temperature. After the hot water temperature is stabilized, the combustion control is performed by the combined control of the feedforward control and the feedback control.

As is well known, the hot water supply device is provided with hot water supply combustion capability, and the hot water supply device performs combustion control within the range of this combustion performance to bring the hot water discharge temperature to a set temperature. The combustion capacity given to a water heater is given by the number, which is 1
No. means the burning capacity required to raise 1 liter of water by 25 ° C. per minute.

In other words, the number of products = water input (liter / min) x
{Outlet temperature (or outlet temperature) (° C) -inlet temperature (° C)}
It is expressed by the formula ÷ 25. For example, the amount of water input is 24 liters /
When the hot water outlet temperature is 40 ° C and the incoming water temperature is 15 ° C, the combustion capacity of the water heater is given as No. 24 by the above formula.
Thus, given the number of combustion capacity, the appropriate flow rate suitable for that number is given by the following equation. Appropriate flow rate (liter / min) = number x 25 / {set temperature (or tap temperature)
(° C) -inlet water temperature (° C)}. In the combustion operation of the water heater, the combustion control is performed so that the hot water of the set temperature is discharged by passing the appropriate flow rate with the given maximum combustion capacity.

When the combustion capacity is given as a specification value, the controller 14 has a vertical axis as a gas amount (gas pressure) controlled by the gas proportional valve 13 and a horizontal axis as an operation amount as shown in FIG. The ability characteristic data shown is given. This capacity characteristic data is data in which the gas supply amount (gas pressure) of the maximum capacity is supplied with the operation amount of 100%, and the gas amount of the minimum combustion capacity is supplied with the operation amount of 0%, such as when the water heater is shipped. Further, the opening of the gas proportional valve 13 is adjusted so that the valve is opened and closed proportionally within the range of the minimum combustion capacity and the maximum combustion capacity.

The opening of the gas proportional valve 13 is usually adjusted by operating a volume (variable resistor). The magnitude of the valve opening amount of the gas proportional valve 13 is proportional to the magnitude of the valve opening drive current applied to the gas proportional valve 13, and, for example, the operation switch is set to the capacity adjustment side and the capacity adjustment switch is set to the maximum combustion capacity side. Adjust the valve for maximum capacity adjustment to set the valve opening drive current at maximum capacity so that the valve opening amount that supplies the gas amount (gas pressure) at maximum capacity combustion is reached. To the minimum combustion capacity side, and the valve opening drive current is set so that the volume for minimum capacity adjustment becomes the opening amount of the gas proportional valve 13 that supplies the gas volume (gas pressure) of the minimum capacity. By switching the operation switch from the capacity adjustment side to the normal combustion mode side, the water heater operates within the range of the maximum combustion capacity (operation amount 0%) to the maximum combustion capacity (operation amount 100%) with the given capacity. Open freely by changing the amount It becomes possible to control the combustion amount by changing the valve drive current.

FIG. 9 is a flowchart showing in more detail the combustion control in the steady operation state of the water heater after the hot water temperature is stabilized. In this operation, when the power is turned on, the hot water tap 1 is opened, and the ON signal of the flow sensor (flow rate sensor) 9 is applied, the rotation of the combustion fan 5 and the point ignition operation are performed as described above. After the temperature is stabilized, the combined control of the feedforward and the feedback controls the stabilization of the hot water temperature. In step 102, the hot water temperature T _out
Is within the temperature range of 0.5 ° C above and below the set temperature T _SP , and if it is within that range, step 10
Determine whether the manipulated value LV is 98% or more with 3. Manipulated variable L
When V is 98% or more, the combustion operation is continued as it is.

When the manipulated variable does not reach 98%, the water heater has a sufficient capacity, and therefore the amount of water is controlled to increase. First, in step 104, it is judged from the operating position of the gear motor GM whether or not the water amount control valve 16 is in the fully opened state. When it is in the fully opened state, the water amount cannot be increased any further, so the combustion operation is continued as it is. When the water amount control valve 16 is not in the fully open state, the gear motor is driven to open the water amount control valve 16 by 0.1 liter.
Then, after waiting t seconds for the amount of water passing through the water heater to stabilize, the hot water discharge temperature is detected, the manipulated variable is varied, and the operations of steps 102 to 106 are repeated to continue the combustion operation. By this combustion operation, the water volume control valve 16 increases the water volume by 0.1 liters until the operation volume becomes 98% or more, and finally the maximum flow rate of the operation volume of 98% or more is 0.5% above or below the set temperature. Hot water in the range of ℃ will come out.

If the hot water outlet temperature does not fall within the allowable range of 0.5 ° C. above or below the set temperature in step 102, it is determined in step 109 whether the hot water outlet temperature is out of the allowable range. If the tap water temperature is outside the allowable range, the combustion heat amount is too large.
At 3, the amount of combustion is reduced and combustion operation is continued.

When the hot water outlet temperature is outside the allowable range, it is judged in step 110 whether or not the operation amount is 98% or more. If the operation amount is lower than 98%, step 11
After increasing the combustion amount in step 2, the combustion operation from step 102 is performed.

When it is judged in step 110 that the operation amount is 98% or more, there is no margin to increase the operation amount. Therefore, in step 111, the gear motor is driven to throttle the water amount control valve 16 by, for example, 0.1 liter. , Wait for t seconds when the water flow becomes stable, and then perform the combustion operation from step 102 onward.

As described above, in the conventional water heater, the operation amount and the water flow amount are adjusted while performing the combustion operation, and the maximum flow rate is reached with the capacity of 98% or more of the finally supplied water heater capacity. Is controlled so that

[0015]

In the conventional water heater, when a capacity is given in advance, for example, No. 24, capacity characteristic data as shown in FIG. 8 is set in accordance with the capacity. Based on the above, the opening of the gas proportional valve 13 is adjusted at the shipping stage of the water heater in order to control the combustion amount.
If the valve opening drive current of the gas proportional valve 13 is mistakenly set to a small value at the 100% position, even if it is attempted to perform combustion control with the maximum capacity of 100% operation amount, the gas supply capacity of the maximum capacity is obtained. Since there is not enough heat, only hot water that is lukewarm than the set temperature can be discharged, and in order to prevent this, the amount of discharged water must be reduced, and the flow rate must be adjusted so that the temperature of the discharged hot water reaches the set temperature. It takes a long time to do,
For example, when the hot water of the water heater is dropped into the bathtub and the hot water is poured at the set temperature, there is a problem that it takes too long to finish the hot water.

Further, there is a characteristic variation in the detection accuracy of the water entering thermistor and flow sensor (flow rate sensor) used in a general water heater, and due to this variation, for example, if the water entering temperature is read high. The appropriate flow rate determined by the combustion capacity increases, and when the appropriate flow rate is passed and hot water is discharged, the hot water temperature will be lower than the set temperature. However, it takes time to adjust the temperature, and it takes a long time to reach the set temperature of the hot water, and there is a problem that the hot water has a slow rising characteristic.

Similarly, if the flow rate (flow rate sensor) 9 is varied and the reading is smaller than the actual flow rate, the same problem occurs.

Further, in the conventional water heater, it takes a long time to adjust the operation amount of hot water at the set temperature or to adjust the opening amount of the gas proportional valve 13 depending on the deviation of the opening adjustment of the gas proportional valve 13 or the variation of the water thermistor. Even if the water flow rate is adjusted, if the hot water supply combustion stops, all the adjustment information will be lost, and when the hot water is discharged next time, it is necessary to perform the operation to adjust the proper operation amount and the proper water amount from the beginning. There was a flaw.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to make the flow sensor and the thermistor of the water flow inconsistent even if the opening of the gas proportional valve is misaligned. Even if it is, you can learn and memorize your own burning ability according to those situations, and with the ability that suits your situation, you can properly discharge the appropriate flow rate and obtain a stable hot water temperature with a fast start-up. (EN) Provided is a combustion device and a combustion capacity updating operation method thereof.

[0020]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention, the combustion heating means of the fluid to be heated passing through the heat exchanger,
A fuel supply control means for controlling the amount of fuel supplied to the combustion heating means and a flow rate control means for controlling the flow rate of the fluid to be heated are provided, and the combustion supply amount of the combustion heating means is varied within the range of the combustion capacity. , In a combustion device that controls the amount of combustion of the combustion heating means so that the fluid to be heated that comes out of the heat exchanger reaches a set temperature, the inlet temperature of the fluid to be heated that enters the heat exchanger during combustion operation and the temperature from the heat exchanger The output temperature of the heated fluid and the flow rate of the heated fluid passing through the heat exchanger are detected, and the output temperature and the flow rate of the heated fluid are within the given stable range, and the state exceeds the given duration. Occasionally, the combustion capacity of actual operation is obtained by calculation based on the detected values of the inlet temperature, the outlet temperature, and the flow rate of the heated fluid, and the previous data is updated as the data paired with the set temperature to perform each setting. The update data of the actual combustion capacity corresponding to the temperature Given data, then when performing combustion operation is configured to initiate a combustion operation using the updated data of the combustion capacity corresponding to the set temperature as a feature.

Further, the update data of the combustion capacity of the actual operation is given as a set of data of the set temperature and the input temperature of the fluid to be heated, and when the combustion operation is performed next time, the combustion corresponding to the set temperature and the input temperature is given. The combustion operation is started using the capacity update data, and one of the conditions for performing the update calculation of the actual combustion capacity is the duration of the heated fluid output temperature and flow rate in the stable range. The variable setting according to the flow rate and the set temperature is also a feature of the combustion capacity updating operation method of the combustion device of the present invention.

Further, the combustion apparatus of the present invention comprises an input temperature detecting means for detecting the temperature of the fluid to be heated introduced to the heat exchanger, a combustion heating means for the fluid to be heated passing through the heat exchanger, and a heat exchanger. Outlet temperature detecting means for detecting the temperature of the heated fluid to be heated, flow rate detecting means for detecting the flow rate of the fluid to be heated introduced to the heat exchanger, and fuel for controlling the amount of fuel supplied to the combustion heating means. Provided with a supply control means and a flow rate control means for controlling the flow rate of the heated fluid, the combustion supply amount of the combustion heating means is varied within the range of the combustion capacity, and the heated fluid coming out of the heat exchanger reaches the set temperature. In the combustion device that controls the combustion amount of the combustion heating means as described above, the input temperature of the heated fluid entering the heat exchanger during the combustion operation, the exit temperature of the heated fluid exiting the heat exchanger, and the heated object passing through the heat exchanger. Detects the flow rate of the fluid and outputs the temperature of the heated fluid And the flow rate are within the given stable range, and the output temperature is within the stable range, and the state exceeds the given duration, the capacity update judgment command section and this capacity A capacity update calculation section for calculating the combustion capacity of actual operation based on the detected values of the input temperature, the output temperature and the flow rate of the fluid to be heated in response to the update command from the update determination command section, and this capacity update calculation section It is characterized in that it has an update data storage section for updating and storing the obtained combustion capacity update value as a pair of data with the set temperature instead of the previous data, and the update data storage section has a combustion capacity. It is also a feature of the present invention that the updated value is updated and stored as data including the set temperature and the input temperature of the fluid to be heated as a set.

[0023]

In the present invention having the above structure, when the combustion operation of the combustion device is performed, the input temperature of the fluid to be heated entering the heat exchanger, the exit temperature of the heated fluid to be heated exiting the heat exchanger, and the heat The flow rate of the heated fluid through the exchanger is detected. On the other hand, when at least the temperature and flow rate of the fluid to be heated enter the stable region and the state continues for a duration longer than that, a command to update the combustion capacity is issued.

In the operation for updating the combustion capacity, condition detection information on the input temperature of the heated fluid entering the heat exchanger, the outlet temperature of the heated fluid exiting the heat exchanger, and the flow rate through the heat exchanger is fetched. Based on the above, the combustion capacity of actual operation is calculated and updated and stored as data paired with the set temperature or as data of a set of the set temperature and the input temperature of the fluid to be heated instead of the previous data. Next, when the combustion device is operated, the combustion operation is started with the optimum combustion capacity corresponding to the set temperature (or the set temperature and the input temperature).

[0025]

Embodiments of the present invention will be described below with reference to the drawings. The combustion apparatus of the present embodiment is intended for the water heater having the system configuration shown in FIG. 7, the same name parts as those shown in FIG. 7 are designated by the same reference numerals, and the duplicate description thereof will be omitted. . FIG. 1 shows a block diagram of a control circuit for carrying out a combustion capacity updating operation method for a combustion apparatus according to the present invention. The control circuit of this embodiment includes a combustion capacity calculation unit 20 and
Proportional valve operation amount calculation unit 21, proportional valve drive unit 22, temperature deviation detection unit 23, set flow rate calculation unit 24, flow rate deviation detection unit 25
A capacity update condition monitoring unit 26 that functions as a capacity update determination command unit, a timer 27, a correction flow rate integration unit 28, a correction flow rate storage unit 29, a capacity update calculation unit 30, and a water amount control valve operation amount calculation unit. 31, a water amount control valve drive direction determination unit 32, a water amount control valve drive unit 33, a water amount control valve fully open / fully closed detection unit 34, an initial data storage unit 35, an update data storage unit 36, and a data selection unit
It has 17 and.

In the initial data storage unit 35, the hot water supply combustion capacity determined at the design stage according to the specifications of the water heater is stored as, for example, No. 24, and further, the operation amount as shown in FIG. The capacity characteristic data showing the relationship of the gas amount (gas pressure) that varies within the range of 0% to 100% of the amount is stored.

Combustion capacity calculation unit 20 and proportional valve operation amount calculation unit
21, the proportional valve drive unit 22, and the temperature deviation detection unit 23 are circuits for performing normal combustion control. To briefly explain this, first, the combustion capacity calculation unit 20 is a temperature setting unit such as the remote controller 15. The temperature deviation set by the temperature deviation detector 23 is received by the temperature information set in step 1, the information of the incoming water temperature detected by the incoming water thermistor 10, and the information of the flow rate detection value detected by the flow rate sensor (flow sensor) 9. The combustion heat quantity (combustion capacity) required to raise the incoming water temperature to the set temperature is calculated by receiving the detection information of the deviation between the outlet heated water temperature and the set temperature, and the calculated result is sent to the proportional valve operation amount calculation unit 21. Add. The proportional valve operation amount calculation unit 21 calculates the operation amount for obtaining the combustion capacity calculated by the combustion capacity calculation unit 20, and adds this value to the proportional valve drive unit 22. The proportional valve drive unit 22 applies the valve opening drive current corresponding to the operation amount calculated by the proportional valve operation amount calculation unit 21 to the gas proportional valve 13 to control the opening amount of the gas proportional valve 13, that is, the gas supply amount. Then, stabilization control of the hot water temperature is performed.

The set flow rate calculation unit 24 calculates an appropriate flow rate corresponding to the combustion capacity of the water heater. This suitable flow rate is obtained by the following equation as described above.

Appropriate flow rate (liter / minute) = number of pieces × 25 /
(Set temperature (℃) -Inlet temperature (℃))

For example, the set temperature is 48 ° C. and the incoming water temperature is 13
Calculating the proper flow rate when the combustion capacity is 24 ° C, it is about 17
Calculated as liters / minute.

The flow rate deviation detecting section 25 compares the detected flow rate obtained from the flow rate sensor 9 with the appropriate flow rate obtained by the set flow rate calculating section 24, detects the flow rate deviation, and outputs the detection result as the capacity update condition. Monitoring unit 26 and water amount control valve operation amount calculation unit
Add to 31.

A condition for judging whether or not the capacity is updated is preset in the capacity update condition monitoring unit 26, and when the condition is satisfied, the capacity is instructed to be updated. As such, a temperature deviation range between the set temperature and the hot water temperature, a flow rate deviation range between the detected flow rate and the appropriate flow rate, a value of the operation amount, and an operation amount range are given in advance. For example, as the deviation temperature range, the value of ± 0.5 ° C against the set temperature is
As the flow rate deviation range, a value of ± 0.1 liter is given for the appropriate flow rate, and the manipulated variable value is 100%.
Appropriate values such as 98% or more and 95% or more are given as the manipulated variable ranges.

The capacity update condition monitoring unit 26 operates in such a manner that the outlet heated water temperature is in the temperature deviation range, the detected flow rate is in the flow rate deviation range, and the operation amount calculated by the proportional valve operation amount calculation unit 21 is given as the update condition. The amount (or operation range) is reached, and the timer 27 is operated to set the tapping temperature within the temperature deviation range and the flow rate within the flow deviation range.
When it is confirmed that the calculated manipulated variable is the given manipulated variable or is in the manipulated variable range for the predetermined duration, the ability update command is used. Add to part 30.

This duration may be given as a fixed time, but in this embodiment, it is given according to the flow rate of water flowing through the heat exchanger 2 and the magnitude of the set temperature. That is, when the flow rate of water flowing through the heat exchanger 2 increases, it takes time for the hot water temperature to stabilize, and similarly, the higher the set temperature, the more difficult it becomes to stabilize the hot water temperature. In consideration of this, in the present embodiment, the optimum duration determined by the set temperature and the water flow rate is obtained by experiments or the like and given as table data or graph data, or the set temperature and water flow rate are set as variables. In advance, when the combustion operation of the water heater is
Based on the detection information of the set temperature and the incoming water temperature, the duration is obtained and given by the table data, the arithmetic expression, and the like. When the flow rate is not within the flow rate deviation range, information to that effect is added to the corrected flow rate integrating section 28.

The water quantity control valve fully open / fully closed detection section 34 detects when the water quantity control valve 16 is in the fully open state and when the water quantity control valve 16 is in the fully closed state, and the detection result is operated by the capacity update condition monitoring section 26 and the water quantity control valve operation. It is added to the quantity calculation unit 31.

The water amount control valve operation amount calculation unit 31 receives the detection result from the flow rate deviation detection unit 25, and when the detected flow rate deviates from the flow rate deviation, the detected flow rate approaches a proper flow rate by a predetermined amount, for example, , 0.1 liter of variable water volume is calculated, and the calculation result is used for the water volume control valve drive direction determination unit 32
Add to. When the water amount control valve 16 is in the fully opened or fully closed state and the water amount cannot be increased or decreased by the signal from the water amount control valve fully open / fully closed detection unit 34, the operation amount calculation is not performed.

The water amount control valve drive direction determination unit 32 receives the information from the water amount control valve operation amount calculation unit 31, and determines the opening / closing drive direction of the water amount control valve for adjusting the water flow rate of the heat exchanger 2 to an appropriate flow rate. It is determined and the driving direction of opening / closing of the water amount control valve and the value of the operation amount calculated by the water amount control valve operation amount calculation unit 31 are added to the water amount control valve drive unit 33. The water amount control valve drive unit 33 drives the water amount control valve 16 to open or close by the operation amount in the opening direction or the closing direction based on the information added from the water amount control valve drive direction determination unit 32.

The correction flow rate integrating unit 28 adds up the correction amount of the water amount whose water amount is controlled every moment during the combustion operation of the water heater, and stores the integration result in the correction flow rate storing unit 29.

The capability update calculation unit 30 is a capability update condition monitoring unit.
When the capacity update command is received from 26, a value obtained by adding the integrated value ΔFW of the corrected flow rate to the appropriate flow rate FW _SP calculated by the set flow rate calculation unit 24 as the appropriate flow rate of the incoming water temperature, the hot water temperature, and the combustion ability. Using the new appropriate flow rate FW _SP value, the combustion capacity is calculated using the equation for calculating the above-mentioned number, and the value of the combustion capacity given before is calculated as the value of the combustion capacity. The update data is updated and stored in the update data storage unit 36.

Tables 1 and 2 show an example of the storage form of the capability update data characteristic of this embodiment.

[0041]

[Table 1]

[0042]

[Table 2]

Table 1 shows an example of a configuration in which the updated data of the combustion capacity GO is stored as a pair with the set temperature. At the time of shipping the water heater, the water heater set at the combustion capacity writing position at each set temperature is determined by the design specifications. , The value of No. 24 is written in this example, respectively. In this state, after the installation and installation of the water heater, the combustion operation is performed to update the capacity, and the capacity data corresponding to the set temperature is rewritten as update data. For example, if combustion operation is performed at a set temperature of 40 ° C and the combustion capacity is calculated as No. 25 by the capacity update calculation, the capacity value for the set temperature 40 ° C written as No. 24 before the combustion operation is set to No. 25. To rewrite.

In the storage form shown in Table 2, the capacity update data is stored in the memory as a set of the set temperature and the incoming water temperature. In this case as well, at the writing position of the capacity data that is determined by the set temperature and the incoming water temperature, the burning capacity of the design specifications at the shipping stage of the water heater, the value of No. 24 in this example, is written. Each time the combustion operation is performed, the combustion capacity update calculation is performed, and the capacity data of the writing position corresponding to the set temperature and the incoming water temperature is updated.

With the memory storage configuration as described above, in the case of Table 1, the hot water supply operation is performed at different set temperatures, so that the combustion capacity GO corresponding to each set temperature is the actual capacity update data. Will be filled by. Also, in the case of the memory configuration shown in Table 2, the combustion operation at different set temperatures and incoming water temperatures is performed, so that the combustion capacity GO corresponding to each set temperature and incoming water temperature is updated by the actual operation capacity update calculation data. Buried.

The data selection section 17 receives the detection information of the incoming water temperature from the incoming water thermistor 10 and the information of the set temperature from the temperature setting section, and in the case of the data storage form of Table 1, updates the capacity corresponding to the set temperature. The data is selected and read, and the read capacity update data is added to the combustion capacity calculation unit 20.
Further, in the case of the data storage form of Table 2, the capacity update data corresponding to the set temperature and the incoming water temperature are selected and read out,
The read capacity update data is added to the combustion capacity calculation unit 20. In this way, the data corresponding to the set temperature and the data corresponding to the set temperature and the incoming water temperature are selected by the data selection unit 17, so that at the time of the next combustion control, the combustion heat quantity is selected by using the selected combustion capacity. Is calculated and combustion control is performed.

The control circuit for carrying out the combustion capacity updating operation method of the present embodiment is constructed as described above. Next, the respective operations of the combustion capacity updating operation using this control circuit will be described with reference to the flow charts of FIGS. It will be explained based on. It should be noted that these flowcharts are shown in the case where the combustion operation is first started after the water heater is installed and constructed. FIG. 2 shows a first operation example of the combustion capacity update operation method. First, after the power is turned on, the initial value GO of the combustion capacity stored in the initial data storage unit 35 in step 201 is, for example, The correction flow rate ΔFW set as No. 24 and stored in the correction flow rate storage unit 29 is set. When the water heater is installed and constructed and is operated for the first time, the correction flow rate ΔFW is set to 0 because the calculation for obtaining the correction flow rate is not performed.

Next, it is judged whether or not the flow sensor is turned on, and when an on signal is applied from the flow sensor (flow rate sensor) 9, combustion operation is started, and at step 204, the set temperature T _SP and the incoming water temperature are set. The T _MIN and the detected flow rate FW detected by the flow rate sensor 9 are read.

Next, in step 205, the initial set combustion capacity GO
The appropriate flow rate FW _SP corresponding to is calculated by the following equation.

FW _SP = GO × 25 / (T _SP −T _MIN )

Next, at step 206, the proper flow rate after flow rate correction is obtained by adding the correction flow rate ΔFW to the proper flow rate FW _SP . In this example, since the initial value ΔFW is 0, the value of the appropriate flow rate FW _SP calculated in step 205 is directly used as the corrected value.

In step 207, the flow rate sensor 9 detects
Detected flow rate FW is appropriate flow rate FW _SP± 0.1
Judgment is made as to whether it is within the flow deviation range of the bottle
Be done. When the detected flow is not within the flow deviation range
Is the detected flow rate outside the flow deviation range or below
In step 218, it is determined whether or not The detected flow rate is
If the flow rate deviation is out of the lower range, increase the flow rate.
The operation in the direction to be performed is performed in steps 219 and 220. Su
In Step 219, check whether the water flow control valve 16 is fully open.
Judgment based on the detection result of the water flow control valve fully open / fully closed detection unit 34
However, when it is not in the fully open state, the gear motor of the water flow control valve 16
Operate in the opening direction to control the flow so that it falls within the deviation range.
It

When the detected flow rate exceeds the flow rate deviation range to the upper side, similarly, it is judged whether or not the water amount control valve 16 is in the fully closed state.
The gear motor of is driven in the closing direction, and in step 222, the flow rate is controlled so as to fall within the flow rate deviation range.

When the detected flow rate is within the flow rate deviation range in step 207, it is determined in step 208 whether the hot water outlet temperature is within the deviation temperature range of ± 0.5 ° C. with respect to the set temperature. The fact that the outlet heated water temperature is not within the deviation temperature range means that the outlet heated water temperature does not fall within the temperature deviation even though the proper flow rate is calculated in step 205 and the detected flow rate is within the flow rate deviation range. It is determined that the water volume setting is incorrect, and the flow proceeds to the water volume correction operation after step 223.

First, at step 223, it is judged whether the hot water outlet temperature is above or below the temperature deviation range with respect to the set temperature. When the temperature deviation range is out of the lower side, the operation for reducing the flow rate is started. First, in step 224, it is determined whether or not the gear motor of the water flow control valve 16 is in the fully closed state.If it is not in the fully closed state, the gear motor is throttled to a predetermined β liter, for example, 0.1 liter, and the correction flow rate storage unit A value obtained by subtracting β from the correction flow rate ΔFW stored in 29 is updated as a new correction flow rate ΔFW value, and the updated value is stored in the correction flow rate storage unit 29.

When the outlet heated water temperature is out of the temperature deviation range to the upper side, a correction operation for increasing the flow rate is performed. First, in step 227, it is confirmed that the water amount control valve 16 is not in the fully open state, the gear motor of the water amount control valve 16 is driven in the β liter opening direction, and it is stored in the correction flow rate storage unit 29 in step 229. A value obtained by adding β to the correction flow rate ΔFW is updated as a new value of the correction flow rate ΔFW, and this updated value is stored in the correction flow rate storage unit 29.

When the detected flow rate is within the flow rate deviation range and the hot water outlet temperature is within the temperature deviation range, the operation amount calculated by the combustion capacity calculation section 20 in step 209 is sent to the capacity update condition monitoring section 26. It is judged whether the operation amount is within the range of 95% or more which is given in advance. When the calculated operation amount does not reach 95% or more, the capacity is not updated,
Since there is a margin until the manipulated variable reaches 95% or more, the correction in the direction of increasing the water flow rate is performed by the operation of step 227 and thereafter, and the corrected flow rate ΔFW is updated.

When it is determined in step 209 that the calculated operation amount has reached 95% or more of the operation amount of the capacity update condition,
When the timer 27 is started and the operation amount calculated by the combustion capacity calculation unit 20 is stable at 95% or more of the update condition during the predetermined timer operation time (duration), and the flow rate is within the flow rate deviation range. After confirming that the state of turning on and the temperature of the hot water coming out of the deviation range continue, the combustion capacity is updated (number update) in step 212. The combustion capacity is updated by the outlet temperature T _OUT , the inlet temperature T _MIN, and the detected flow rate F.
Take in W and use the above formula to obtain the number G
It is performed by calculating O. Then, the number corresponding to 100% of the operation etc. obtained by this calculation is determined as the original combustion capacity of the water heater, and the number given as the initial data is updated to the number obtained by this calculation. At 212 A, this is stored in the update data storage unit 36 as data paired with the set temperature as shown in Table 1. Then, the timer 27 is cleared, the correction flow rate ΔFW is cleared to 0, and the first
Finish the second ability update.

Next, at step 215, it is judged whether or not the off signal is output from the flow sensor. When the on signal is applied from the flow sensor, the operations after step 204 are repeated to update the combustion ability one after another. Go to.

According to this capacity updating operation, it is considered that there are variations in the characteristics of the water input thermistor 10 and the flow sensor (flow rate sensor) 9, and the reading error causes an error in the appropriate flow rate calculated in step 205. However, those errors are compensated by the water amount correction operation after step 223, and at the time of the next capacity updating operation, the appropriate water amount corrected in step 206 is used to repeatedly perform the capacity updating, and as a result, the learning effect causes By repeating the capacity updating operation, the capacity suitable for the actual condition of the water heater is automatically updated and set.

Further, in this embodiment, since the calculation data for capacity update is stored as a pair of data with the set temperature, each set used while the combustion operation is repeated with the change of the set temperature. Since the optimum combustion capacity value corresponding to the temperature is stored, even when the set temperature is changed during the combustion operation and the combustion operation is performed, the hot water combustion is performed using the combustion capacity corresponding to the changed set temperature. Since the operation can be performed, efficient combustion operation can be performed.

FIG. 5 shows an example of the occurrence of a problem when the combustion capacity update data for actual operation is not directly paired with the set temperature data but only the combustion capacity value is updated as it is. . For example, when the set temperature is changed to a higher temperature at the point A during the combustion operation, there is a problem that it takes time to reach the point B at which the hot water temperature stabilizes at the changed set temperature. This cause occurs when the characteristics of the flow rate sensor 9 and the water inflow thermistor 10 are not linear, or the reading accuracy of the sensor varies depending on the magnitude of the flow rate and the temperature and is not uniform. For example, as shown in FIG. 6A, when the read flow rate deviates from the actual flow rate indicated by the solid line as indicated by the broken line, Q _A −ΔQ
_When the actual flow rate of _A is read as Q _A , the set temperature is low, a large amount of hot water is discharged, and the actual operating combustion capacity is updated when the set temperature is stable, Since the flow rate flowing is Q _A −ΔQ _A , the actual combustion capacity GO is

GO = (T _OUT −T _IN ) × (Q _A −ΔQ _A ) / 25

On the other hand, since the flow rate is read as Q _A , the calculated combustion capacity GO ′ is

GO ′ = (T _OUT −T _IN ) × Q _A / 25

Then, GO ′> GO, and the calculated ability GO ′ is (ΔQ _A ×
25) It will be increased by a considerable amount. In addition, T _OUT is the hot water temperature,
T _IN indicates the incoming water temperature.

In this state, if the set temperature T _SP is changed to a higher value, the appropriate flow rate FW _{SP in} step 205 becomes

FW _SP = GO '× 25 / (T _SP -T _IN )

Is obtained and controlled as
As described above, since the capacity calculation value GO 'is calculated as much as (ΔQ _A × 25), the appropriate flow rate FW _SP is increased by the calorific value, as shown in the set temperature changing portion of FIG. In addition, the hot water outlet temperature will be lower than the set temperature. If this happens, when an attempt is made to update the combustion capacity, the stable condition of the outlet heated water temperature determined in step 208, that is, the outlet heated water temperature deviates from the temperature deviation range of ± 0.5 ° C of the set temperature in the lower direction. Since the water amount decrease correction is performed, there is a problem that it takes time until the outlet heated water temperature finally falls within the temperature deviation range of the set temperature.

The reduction correction of the water amount is performed until the actual appropriate flow rate is reached, and finally the actual combustion capacity GO and the actual operation calculated combustion capacity GO ′ are equal to each other, and GO ′ = GO. When the set temperature is changed from a high temperature to a low temperature, this time, following the reverse path, GO '<
It becomes a relation of GO, and the increase of flow rate is corrected and G
There is a problem that it takes time until the relationship of O '= GO is satisfied. This phenomenon, as shown in FIG. 6 (b), for the characteristics of the incoming water thermistor 10 is not linear, it is also caused that the actual temperature T _A -.DELTA.T _A when would read as T _A, set Each time the temperature is changed, the hot water temperature and flow rate fluctuate and become unstable.

On the other hand, as in the present embodiment, by giving the actual combustion capacity update data as data paired with the set temperature, when the set temperature is changed during the combustion operation, it is changed. It is possible to read out the combustion capacity data corresponding to the set temperature and immediately perform appropriate combustion operation based on the combustion capacity data, so even if the set temperature is changed, the hot water temperature and flow rate will fluctuate and become unstable. Therefore, it is possible to obtain the excellent effect that the hot water having the changed set temperature can be immediately and stably discharged.

Moreover, the combustion ability obtained through repeated learning is updated and stored in the update data storage unit 36, so that when the combustion operation is performed next time,
In addition, since the hot water supply operation is performed from the beginning using the combustion capacity that matches the actual condition of the water heater, the proper amount of water of that capacity can be accurately obtained without being affected by the characteristic performance of the flow rate sensor 9 and the water inflow thermistor 10. Therefore, it is not necessary to adjust the water flow rate control valve to adjust the water flow rate to the appropriate flow rate, and it is not necessary to adjust the water flow rate over a long period of time, and hot water of the set temperature can be created within a short time after the hot water supply operation is started. As soon as the user opens the tap, the user can quickly obtain an appropriate amount of hot water and hot water temperature at the maximum capacity of the water heater.

Even when the heat efficiency of the heat exchanger 2 is lowered due to the secular change of the water heater, the actual combustion capacity is accurately set by the capacity updating operation, and the heat efficiency is lowered. In this way, it is possible to perform optimal combustion operation control with reasonable thermal efficiency.

FIG. 3 shows the second capacity updating operation. The operation of this flowchart is step 212.
After performing the update calculation of the combustion capacity of the actual operation, the set data T _SP and the incoming water temperature T _MIN are calculated as shown in Table 2.
The data is stored in the update data storage unit 36 as a pair of data, and the other operation is the same as the first operation shown in FIG. When the incoming water temperature changes, as shown in FIG. 6 (b), if the linearity of the incoming water thermistor 10 and the detection accuracy for each temperature vary, a difference occurs between the actual temperature and the reading temperature. There is a possibility that an unstable phenomenon may occur due to fluctuations in the set temperature and the appropriate flow rate based on the above, but even if the incoming water temperature changes by giving the combustion capacity as the data of the set temperature and incoming water temperature as shown in this flowchart. , The combustion capacity GO corresponding to the changed incoming water temperature is read from the update data storage unit 36,
Since accurate combustion control can be performed, fluctuations in the outlet hot water temperature and flow rate fluctuation due to fluctuations in the incoming water temperature are eliminated, and more stable hot water supply combustion operation can be performed.

FIG. 4 shows a flowchart of the third capacity updating operation. In the operation of this flowchart, it is confirmed in step 207 that the water flow rate is within the flow deviation range with respect to the appropriate flow rate, and in step 208 that the tap water temperature is within the temperature deviation range, and
After confirming that the manipulated value is 95% or more in step 209, if these states continue for more than the duration t, command the actual operating combustion capacity update operation. In step 209A, the time t is set to a value according to the flow rate of water flowing through the heat exchanger 2 and the size of the set temperature, and other operations are the same as those in the first and second steps. Is the same as each operation.

When the hot water temperature fluctuates, the time it takes for it to stabilize becomes longer as the flow rate increases, and the hot water temperature stabilizes more when the set temperature is higher than when it is low. Takes a long time. For this reason, if the duration t is set to a short fixed time, the capacity may be updated in an unstable state when the flow rate is large, etc. If the duration t is set to a long time, it will take a long time to update the capability. In the third operation, in order to solve these problems, an appropriate duration that is neither short nor long is given depending on the set temperature and the magnitude of the flow rate. The specific setting of this duration is to obtain the appropriate time for the hot water temperature to stabilize by various combinations of the set temperature and the flow rate in advance through experiments etc. and give it as graph data or table data, or Then, an arithmetic expression with the set temperature as a variable is given in advance, and the duration is set using the data and the arithmetic expression given in advance based on the values of the set temperature and the detected flow rate. In this way, by giving the duration according to the magnitude of the flow rate and the set temperature, it is possible to perform an efficient combustion capacity updating operation with no dead time.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in each of the above-described embodiments, the hot water supply device has been described as the combustion device, but the present invention is also applied to other combustion devices such as an air conditioner that heats or cools using gas or oil as fuel, or a bath kettle. It is what is done.

[0078]

The present invention detects the temperature of the heated fluid entering the heat exchanger, the temperature of the heated fluid exiting the heat exchanger, and the flow rate of the heated fluid passing through the heat exchanger during combustion operation, Based on these condition detection information, when the combustion capacity update condition is satisfied, the actual combustion capacity is calculated, and the combustion capacity is sequentially calculated and updated and stored during the combustion operation. Due to the learning effect of the sequential update of the combustion capacity, it is possible to accurately obtain the combustion capacity that matches the actual condition of the combustion device, and by performing the combustion operation control based on this accurate combustion capacity, the accuracy of the combustion control is significantly improved. Can be increased.

Further, since the update calculation value of the combustion ability obtained by the learning effect is stored, the next time the combustion operation is performed, the combustion operation is performed with the stored correct combustion ability. The heating fluid can be quickly heated to the set temperature, the startup speed of the combustion operation can be increased, and the optimal combustion efficiency can be improved.

Further, in the configuration in which the update calculation value of the combustion capacity is stored as a pair of data with the set temperature, when the set temperature is changed during the combustion operation, the set temperature after the change is set. Since accurate combustion operation can be performed immediately using the corresponding combustion capacity data, fluctuations in the output temperature of the fluid to be heated due to changes in the set temperature can be prevented, and the output temperature can be changed regardless of the change in the set temperature. It is possible to perform stable heating and combustion operation of the fluid to be heated without fluctuation.

Further, in the structure in which the update calculation value of the combustion capacity is stored as the data of the set temperature and the input temperature of the fluid to be heated introduced to the heat exchanger, the set temperature is changed. Not only can fluctuations in the output temperature of the heated fluid accompanying it be prevented, but fluctuations in the output temperature of the heated fluid due to changes in the input temperature of the heated fluid can also be prevented, and more stable heating and combustion of the heated fluid. It becomes possible to drive.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a control circuit for carrying out a combustion capacity updating operation method for a combustion apparatus according to the present invention.

FIG. 2 is a flowchart showing a first operation of a combustion capacity updating operation method using the control circuit of the embodiment.

FIG. 3 is a flowchart showing a second operation of the combustion capacity updating operation method using the control circuit of the embodiment.

FIG. 4 is a flowchart of a third operation of the combustion capacity updating operation method using the control circuit of the embodiment.

FIG. 5 is an explanatory diagram of fluctuation in fluctuation of outlet hot water temperature that occurs when the set temperature is changed.

FIG. 6 is an explanatory diagram of an influence due to a reading error of a flow rate sensor and a water entry thermistor.

FIG. 7 is a system configuration diagram of a water heater generally known as a combustion device.

FIG. 8 is an explanatory diagram of an ability characteristic diagram of a general water heater.

FIG. 9 is a flowchart showing a combustion operation of a general water heater.

[Explanation of symbols]

 16 Water flow control valve 17 Data selection section 20 Combustion capacity calculation section 24 Set flow rate calculation section 26 Capacity update condition monitoring section 28 Corrected flow rate integration section 30 Capacity update calculation section 31 Water flow control valve manipulated variable calculation section 36 Update data storage section

Claims (5)

[Claims] 1. A combustion heating means for heating a heated fluid passing through a heat exchanger, a fuel supply control means for controlling an amount of fuel supplied to the combustion heating means, and a flow rate control means for controlling a flow rate of the heated fluid. Combustion operation in which the combustion supply amount of the combustion heating means is varied within the range of combustion capacity and the combustion amount of the combustion heating means is controlled so that the fluid to be heated exiting the heat exchanger reaches the set temperature. The temperature of the heated fluid entering the heat exchanger, the temperature of the heated fluid exiting the heat exchanger, and the flow rate of the heated fluid passing through the heat exchanger are detected. When the given stable range is entered and the state exceeds the given duration, the actual combustion capacity is calculated and set based on the detected values of the inlet temperature, the outlet temperature and the flow rate of the heated fluid. Update the previous data as data paired with temperature Is performed to give update data of the actual combustion capacity corresponding to each set temperature, and when the combustion operation is performed next time, the combustion operation is started using the update data of the combustion capacity corresponding to the set temperature. And operating method for updating combustion capacity of combustion device. 2. The update data of the combustion capacity of the actual operation is given as a set data of the set temperature and the inlet temperature of the fluid to be heated, and the combustion ability corresponding to the set temperature and the inlet temperature when the next combustion operation is performed. The combustion capacity update operation method for a combustion device according to claim 1, wherein the combustion operation is started using the update data of. 3. The duration in the stable range of the output temperature and the flow rate of the heated fluid, which is one of the conditions for performing the update calculation of the combustion capacity in actual operation, depends on the flow rate of the heated fluid and the magnitude of the set temperature. The variable setting is performed according to claim 1 or claim 2.
A method for operating combustion capacity updating of the described combustion apparatus. 4. An input temperature detecting means for detecting the temperature of a fluid to be heated introduced to a heat exchanger, a combustion heating means for the fluid to be heated passing through the heat exchanger, and a fluid to be heated heated by the heat exchanger. Outflow temperature detecting means for detecting the temperature, flow rate detecting means for detecting the flow rate of the fluid to be heated introduced to the heat exchanger, fuel supply control means for controlling the amount of fuel supplied to the combustion heating means, and heating target And a flow rate control means for controlling the flow rate of the fluid, the combustion supply amount of the combustion heating means is varied within the range of the combustion capacity, and the combustion heating means burns the heated fluid output from the heat exchanger to a set temperature. In a combustion device that controls the amount, the inlet temperature of the heated fluid that enters the heat exchanger during combustion operation, the outlet temperature of the heated fluid that exits the heat exchanger, and the flow rate of the heated fluid that passes through the heat exchanger are detected. Within the stable range given by the temperature and flow rate of the heated fluid A capacity update determination command section that issues a combustion capacity update command when the temperature exceeds the given duration after the temperature has entered and has reached the stable range, and an update command from this capacity update determination command section A capacity update calculation unit that receives and calculates the combustion capacity of actual operation based on the detected values of the input temperature, the output temperature, and the flow rate of the fluid to be heated, and sets the combustion capacity update value calculated by this capacity update calculation unit A combustion apparatus having: an update data storage unit that updates and stores the temperature data as a pair with the previous data. 5. The combustion apparatus according to claim 4, wherein the update data storage unit updates and stores the combustion capacity update value as a set of temperature and input temperature of the fluid to be heated.