JPH1038374A - Hot water feeder and method for controlling combustion during re-feeding of hot water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a controlling accuracy for stabilizing a hot water temperature during re-feeding of hot water in consideration of a post-boiling time of the hot water temperature varying in complex manner in re-feeding of it in reference to a length of waiting time from a stopped state of hot water feeding combustion to a starting of re-feeding of hot water. SOLUTION: A post-boiling time L0 until post-boiled hot water having a higher temperature than a set temperature is completely discharged through feeding of water during re-feeding of hot water is calculated in advance as an experimental function data with a waiting time from a stopping of hot water feeding combustion being applied as variable. An auxiliary post-boiling time α having a constant value over an entire section of a waiting time is given for every flow rate of re-feeding of hot water, and an allowable range is applied for each of the auxiliary post-boiling times. In the case that the re-feeding of hot water is carried out at a section where an experimental function data is set in an allowable range of the auxiliary post-boiling time a, a gas raising amount during the re-feeding of hot water is corrected by applying the auxiliary post-boiling time and in turn in the case that re-feeding of hot water is carried out at a section where the experimental function data is out of the allowable range of the auxiliary post-boiling time, a fixed amount of gas near a requisite heating calorie needed for increasing a temperature of fed water to a set temperature is raised and supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the combustion of a hot-water supply unit for stabilizing the temperature of the hot-water supply at the time of re-watering, and to a water heater with the combustion control device.

[0002]

2. Description of the Related Art FIG. 7 shows a general system configuration of a water heater. In the figure, a water supply pipe 3 is connected to the inlet side of the heat exchanger 2. The water supply pipe 3 has an input water thermistor 10 for detecting an input water temperature, and an input water quantity (hot water supply flow rate).
And a flow sensor 9 for detecting the flow rate. A hot water supply pipe 4 is connected to an outlet side of the heat exchanger 2, and a hot water tap 1 is provided at an outlet side of the hot water supply pipe 4. Furthermore, hot water supply pipe 4
Has a water flow control valve 16 and a tap water thermistor that detects the tap water temperature.
11 are provided.

A burner 7 and a burner 7 are provided below the heat exchanger 2.
An igniter electrode 18 for igniting the fuel, a flame rod electrode 19 for detecting ignition, and a combustion fan 5 for supplying and exhausting gas are provided.
The gas pipe 8 communicating with the gas nozzle 6 has a gas proportional valve 13 for controlling the gas supply amount by the valve opening amount.
And a gas solenoid valve 12 for opening and closing the pipeline.

A water heater of this type is provided with a control device 14, which is connected to a remote controller 15. The remote controller 15 has a button for setting the hot water temperature and a display for displaying the set hot water temperature. Is provided. The control device 14 controls the hot water supply operation of the water heater, and when the hot water tap 1 is opened, the flow sensor 9 detects the amount of incoming water, and when the amount of incoming water becomes a certain value or more (the minimum operating flow or more). Upon receiving the signal from the flow rate sensor 9, the control device 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 gas to the burner 7, and the igniter electrode 18 performs an ignition operation. When the flame rod electrode 19 detects the ignition of the gas, the control device 14 varies the opening amount of the gas proportional valve 13 and controls the stabilization of the temperature of the hot water flowing out of the heat exchanger 2.

[0005]

When the water heater is cold-started (when the water heater is started in a cold state), it takes a little time from the start of combustion until the hot-water at the hot-water set temperature comes out. However, in the case of intermittent use in which hot water is supplied again within a short period of time after the stop of hot water supply combustion, it is desirable to discharge hot water as little as possible in temperature fluctuation. From such a viewpoint, for example, a predetermined time, for example, 5 minutes from the time of stopping the combustion is set as a standby time for performing the hot water temperature stabilization control for intermittent use, and the hot water tap 1 is opened within this standby time. If the hot water is reapplied,
Overshoot (a phenomenon in which the heat retained in the heat exchanger 2 is added to the internal hot water after the stop of the hot water supply combustion and hot water with a higher boiling point than the set temperature comes out) or undershoot (gas rising). The phenomenon of the shortage of the supply amount due to the shortage of the supply amount of hot water (the phenomenon of hot water lower than the set temperature) is performed, and the stabilization control of the hot water temperature is performed.

[0006] The stabilization control of the re-draining hot water temperature is, for example, as follows.
As shown in FIG. 8, the falling characteristics of the hot water temperature after the boiling time after to the rear side of the water finishes out by passing water at the time of re-tapping L _D (heat when passed through in a state that does not burn the burner The rising characteristic of the hot water after the rising delay time L _P from the start of re-watering (the temperature of the water supplied by the burner combustion rises with the time delay L _P). Temperature rise characteristic) is obtained in advance, and a fall amount D of the hot water temperature based on the fall characteristic and a rise amount U of the hot water temperature based on the rise characteristic of the hot water temperature are determined, and the decrease amount D and the rise amount U are offset. As described above, the rise amount of the gas (the gas amount for obtaining the required heat amount required to raise the incoming water temperature to the set temperature) obtained by the feedforward calculation is increased or decreased.

FIG. 9 shows a control form of the feedforward gas supply amount. In the figure, when the gas amount correction control is not performed after the point ignition, the required heat amount required to raise the incoming water temperature to the set temperature is obtained by feedforward calculation as shown by the broken line, Supply as quantity. Then, when the hot water temperature approaches the hot water supply set temperature, the control shifts from feedforward control to proportional control indicated by a solid line using both feedforward calculation and feedback calculation.

However, in the feedforward control without the gas amount correction control, as shown in FIG. 8, the amount of decrease D in the temperature of the hot water and the rise in the temperature of the hot water due to the rising characteristic of the temperature. In the case of FIG. 8, since the amount U does not coincide with the amount U, the amount of decrease D of the hot water temperature is larger than the amount of increase U, so that the phenomenon of undershoot hot water occurs as shown in the tapping characteristics shown in FIG. In order to prevent the undershoot hot water, as shown in FIG. 9, a shortage gas amount is added to the feedforward start-up gas amount by a gas amount indicated by oblique lines as a correction gas amount, and the undershoot is reduced. Prevents hot water from flowing out.

The amount of decrease D of the hot water temperature due to the falling characteristics of the hot water temperature is the amount of increase U of the hot water temperature due to the rising characteristics of the hot water temperature.
On the contrary, when the temperature is smaller than the above, the hot water of the overshoot flows on the contrary, so that the rising gas amount by the feedforward calculation is corrected to decrease and the stabilization control of the hot water temperature is performed again.

The inventor of the present invention has conducted various experiments for stabilizing control of the temperature of the reheated hot water of the water heater. In particular, the exhaust pipe 20 and the intake pipe 21 shown in FIG. In such a device, during the post-purge after the combustion is stopped (the operation of continuously rotating the combustion fan 5 for a predetermined time after the combustion is stopped to discharge the exhaust gas remaining in the combustion chamber), the exhaust flow and the intake flow are reduced. Is subjected to heat exchange, and high-temperature air is supplied to the heat exchanger 2, so that the temporal change in the amount of heat retained in the heat exchanger 2 changes in a complicated manner within the standby time, and therefore, the fall of the hot water temperature Post-boil time L _D which affects the fixed point when the characteristic falls
Did not have a relationship proportional to the standby time, and came to find a phenomenon that changes in a complicated manner as the standby time elapses.

FIG. 2 shows experimental data obtained by the present inventor for determining the after-boil time L _D using the standby time as a variable. The experimental data is obtained when the flow rate of water flowing through the heat exchanger 2 is constant at a certain value, and the post-boil time L _D has a complicated high-order equation with respect to the standby time.

[0012] Incidentally, FIG. 3 shows the experimental data obtained or boiling time L _D post at a certain standby time when there is a change how the water passage flow rate of the heat exchanger 2. From the experimental data, it is understood that the post-boil time L _D has a proportional relationship with the flow rate at each time point of the standby time.

As described above, the post-purge causes the post-boil time L _{D to become} complicated depending on the standby time due to the hot water falling characteristic. This phenomenon is caused by the exhaust pipe 20 and the intake pipe 21 having a double tubular shape. Not only those, the exhaust pipe 20 and the intake pipe 21 are provided side by side and can be exchanged with each other, and even when the intake and the exhaust do not exchange heat with each other, Since the exhaust resistance varies depending on the length of the exhaust passage, the post-boiling time takes a complicated appearance as the exhaust path becomes longer.

In the prior art, it was not assumed that the post-boil time L _D would take on a complicated appearance due to such a standby time. Since the boiling time L _D cannot be taken in a correct value, it is difficult to accurately control the start-up and supply amount of the gas. It has been difficult to accurately stabilize the temperature of the hot water from equipment that has a long path.

The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to control the stabilization of the re-hot water temperature in consideration of the phenomenon that the after-boil time changes complicatedly within the standby time. An object of the present invention is to provide a combustion control method and a water heater with a combustion control device, which can be performed with high accuracy at the time of re-watering of the water heater.

[0016]

In order to achieve the above object, the present invention takes the following measures. That is,
In the first invention of the combustion control method, a period from the stop of hot water supply combustion for performing stabilization control of the reheated hot water temperature after the stop of hot water supply combustion is preset as a standby time,
When performing the hot water re-starting within the waiting time, the hot water temperature rise corresponding to the hot water temperature rising after the rising delay time from the start of the hot water re-starting and the hot water temperature rising after the elapse of the post-boiling time due to the flow of the hot water re-starting. In the combustion control method at the time of re-watering of a water heater in which a rising amount of fuel gas is corrected in a direction to offset a difference from a drop in hot water temperature corresponding to a drop, a post-boiling time using the standby time as a variable The auxiliary post-boiling time, which is of a magnitude proportional to the hot water supply flow rate at the time of re-hot water supply and becomes a constant value over the entire standby time, is given. In the interval of the standby time in which the data of the post-boil time with the standby time as a variable is included in the allowable range of the auxiliary post-boil time, the auxiliary post-boil time is used as the post-boil time. Adopt gas Correct the startup amount, and stop the correction of the startup amount of gas at the time of re-watering in a section of the standby time in which the data of the post-boil time using the standby time as a variable is out of the allowable range of the auxiliary post-boil time. This is a means for solving the problem with a configuration in which a fixed fixed amount of gas in the vicinity of the feedforward gas amount required to raise the incoming water temperature to the hot water supply set temperature is started.

In the second invention of the combustion control method, a period from the stop of the hot water supply combustion for performing the stabilization control of the re-hot water temperature after the stop of the hot water supply combustion is preset as a standby time. In addition, when performing re-watering within this standby time, when the hot-water temperature rise corresponding to the rising of the hot-water temperature after the rising delay time from the start of re-watering and after the elapse of the post-boiling time due to the flow of the hot water again In the combustion control method at the time of re-watering of a water heater in which a rising amount of fuel gas is corrected and burned in a direction to offset a difference between the falling of the hot water temperature and the falling of the hot water temperature, the standby time is a variable. After that, basic data of the boiling time is given, and this data is divided by dividing the standby time into a plurality of parts.
An approximate expression obtained by approximating the basic data with an approximate expression using standby time as a variable is given to the above-mentioned divided sections. This is a means for solving the problem with a configuration in which the after-boiling time is obtained by the equation to correct the rising amount of the gas.

In the third invention of the combustion control method, a period from the stop of the hot water supply combustion for performing the stabilization control of the reheated hot water temperature after the stop of the hot water supply combustion is preset as a standby time. In addition, when performing re-watering within this standby time, when the hot-water temperature rise corresponding to the rising of the hot-water temperature after the rising delay time from the start of re-watering and after the elapse of the post-boiling time due to the flow of the hot water again In the combustion control method at the time of re-watering of a water heater in which a rising amount of fuel gas is corrected and burned in a direction to offset a difference between the falling of the hot water temperature and the falling of the hot water temperature, the standby time is a variable. After that, basic data of the boiling time is given, and this data is divided by dividing the standby time into a plurality of parts.
A linear approximation obtained by approximating the above basic data with a linear expression having a standby time as a variable is given to the above-mentioned divisions. This is a means for solving the problem with a configuration in which the after-boiling time is obtained by the first-order approximation formula to correct the rising amount of the gas.

In the fourth invention of the combustion control method, a period from the stop of the hot water supply combustion for performing the stabilization control of the reheated hot water temperature after the stop of the hot water supply combustion is preset as a standby time. When performing re-watering within this standby time, the water temperature rise corresponding to the rise of the water temperature after the rise delay time from the start of re-water supply and the water temperature after the elapse of the post-boiling time due to the flow of the re-water supply In the combustion control method at the time of re-watering of a water heater in which the rising amount of fuel gas is corrected and burned in a direction to offset the difference with the falling of the hot water temperature corresponding to the falling of Given the boiling time data, given as a higher-order approximation formula with the waiting time as a variable, and when re-starting the hot water, use this higher-order approximation formula to calculate the post-boiling time to correct the gas startup amount. Means to solve To have.

The first invention of the water heater with the combustion control device is characterized in that a period from the stop of the hot water supply combustion for performing the stabilization control of the re-hot water temperature after the stop of the hot water supply combustion is set in advance as a standby time. When setting the hot water again during this standby time, after the hot water temperature rise corresponding to the rising of the hot water temperature after the rising delay time from the start of the hot water restart and after the post-boiling time due to the flow of the hot water again, In a water heater with a combustion control device that corrects a rising amount of fuel gas and burns in a direction that offsets a difference between the falling of the hot water temperature and the falling of the hot water temperature, the post-boiling using the standby time as a variable The main data storage unit to which the time data is given, and the auxiliary post-boiling time, which has a size proportional to the hot water supply flow rate at the time of re-starting the hot water and is constant over the entire section of the standby time, and the auxiliary post-boiling time up and down The allowable data range An auxiliary data storage unit provided for each magnitude of the hot water flow rate, and data of the auxiliary post-boiling time in the auxiliary data storage unit corresponding to the detected hot water flow rate obtained when hot water supply flow rate detection information is obtained at the start of re-water supply. A post-boil time range determining unit that compares the data in the main data storage unit with the data in the main data storage unit to determine whether the value of the data in the main data storage unit at the start of re-water supply is within the allowable range of the auxiliary post-boil time, When the value of the data in the main data storage is within the allowable range of the auxiliary boiling time based on the result of the judgment by the boiling time range judging unit, the amount of gas startup is corrected by using the auxiliary boiling time as the after boiling time. If the value of the data in the main data storage section is out of the allowable range of the post-assistant boiling time, the correction of the rising amount of gas is stopped and the feed water required to raise the incoming water temperature to the set hot water supply temperature is used. Launch gas amount of a certain fixed amount of cathode gas quantity around with a structure having a gas amount raising control unit has a means for solving the problems.

According to a second aspect of the present invention, there is provided a water heater with a combustion control device, wherein the water heater with the combustion control device has the configuration of the first invention. The auxiliary boiling time that is constant in all sections is given, and the auxiliary boiling time is calculated by obtaining information on the hot water supply flow rate at the time of re-starting the hot water.

In the above invention, the function data of the boiling time using the waiting time as a variable is obtained in advance by an experiment, for example, and the experimental function data of the boiling time is given by a higher-order approximation formula, or the waiting time is divided into a plurality of times. In the configuration in which the experimental function data of each of the divided sections is simplified and given by a first-order approximation formula, even in the case where the after-boil time has a complicated appearance within the standby time, the complicated after-boil time is not required. Since the start-up supply amount of the feedforward gas amount at the time of re-starting hot water can be corrected and controlled by using the approximate expression, it is possible to improve the accuracy of the re-starting hot water temperature stabilization control.

Further, the concept of the auxiliary post-boiling time is adopted, and the auxiliary post-boiling time is compared with the experimental function data. If the experimental function data falls within the allowable range of the auxiliary post-boiling time, the auxiliary post-boiling time is used as the auxiliary boiling time. After boiling time is adopted and the experimental function data is out of the allowable range of auxiliary after boiling time,
In the invention in which the correction of the start-up gas amount is stopped and the fixed gas amount is started, control can be performed using a simple auxiliary after-boiling time without using complicated experimental function data, and the auxiliary after-boiling time can be controlled. In the section where time cannot be used, that is, in the section where the experimental function data is out of the allowable range of the post-assisted boiling time, a fixed fixed amount of gas near the feedforward gas amount required to raise the incoming water temperature to the hot water supply set temperature is started. Therefore, the gas starting amount does not greatly deviate from the actual situation, and high-precision stabilization control of the re-hot water temperature can be performed, although the control configuration can be simplified. As described above, in each invention of the present application, the after-boil time is set so as to match the actual situation as much as possible in consideration of the after-boil time which changes in a complicated manner depending on the standby time. Is significantly improved, and the object of the present invention is achieved.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The water heater of each embodiment described below is applied to various types of water heaters such as a single-function water heater and a combined water heater / bath machine, but for convenience of explanation, the water heater of FIG. 6 and FIG. The system configuration shown will be described as a representative example. In FIGS. 6 and 7, the same reference numerals are given to the same components, and the description thereof will not be repeated.

FIG. 1 is a block diagram showing a characteristic control structure of the apparatus of the present invention for performing the method of the present invention. This characteristic configuration is provided in the control device 14 of the water heater,
The configuration of the first embodiment includes a main data storage unit 22, an auxiliary data storage unit 23, a post-boil time range determination unit 24, a gas amount startup control unit 25, and a standby time measurement unit 26. It is configured.

The first embodiment is intended to control the temperature of the recirculated hot water with high accuracy by a simple handling process without directly using the after-boil time itself, which changes complicatedly with the elapse of the standby time. Is what you do.

The standby time measuring means 26 is constituted by a timer clock, and measures the lapse of time from the stop of hot water supply combustion.

In the main data storage section 22, data of the after-boil time L _D of the falling characteristic using the standby time as a variable as shown in FIG.

On the other hand, auxiliary data storage section 23 stores post-auxiliary boiling time data and data in an allowable range vertically sandwiching the auxiliary post-boiling time data. In this embodiment, as shown in FIG.
Paying attention to the fact that _D changes proportionally, a plurality of auxiliary post-boiling time data are stored for each of the values of the amount of water passing through the heat exchanger 2.

Assuming that the flow rate of water passing through the heat exchanger 2 is Q, the post-auxiliary boiling time α is represented by the following equation: α = BQ + Z. Here, B and Z are constants, and the flow rates Q ₁ ,
Q _2, Q _3, · · · · · to the time α is BQ ₁ + Z boiling after adjuvant its _{corresponding, BQ 2 + Z, BQ 3} + Z, ·
············································································· Each α is given a permissible range vertically sandwiching the α, and the data of the auxiliary boiling time is stored in the auxiliary data It is stored in the unit 23.

When the hot-water tap 1 is opened and re-water supply is started, the post-boil time range determination unit 24 detects the start of re-water supply by a flow rate detection signal of the flow rate sensor 9 or the like. The standby time at the start (time from the stop of hot water supply combustion to the start of re-hot water supply) is detected. Then, based on the value of the hot water supply flow rate detected by the flow rate sensor 9, the auxiliary post-boiling time α corresponding to the flow rate and the allowable range thereof are read out from the auxiliary data storage unit 23, and the main data storage unit
Experimental function data of after-boiling time stored in 22 and FIG.
The comparison is made as shown in FIG.

Then, it is determined whether or not the value of the experimental function data at the starting point of re-starting the hot water is out of the allowable range of the auxiliary time constant α within the section of the waiting time. That is, in the example of FIG. 4, it is determined that the experimental function data is out of the allowable range of the post-assistance boiling time α in the interval between the re-starting points I and III. Is determined to be within the allowable range of the post-assisting boiling time α, and the result of the determination is added to the gas amount startup controller 25.

The gas amount raising control unit 25 based on the determination result of the after boiling time range determining unit 24, when re-tapping start is a section I and III of the waiting time, the flow rate Q of the incoming water temperature T _w The required heat amount P required to raise the temperature to the set temperature T _st is obtained by a feedforward calculation of P = Q (T _st −T _w ), and is calculated by a predetermined 100% or 110%.
% Or a predetermined fixed ratio such as 120%, a fixed fixed amount of gas near the feedforward gas amount required to raise the incoming water temperature to the hot water supply set temperature is started and supplied.

On the other hand, in the section where the starting point of the re-hot water is II, that is, in the section where the experimental function data of the after-boiling time is within the allowable range of the after-boiling time, the auxiliary after-boiling time α is adopted. Using the post-assistance boiling time α, the feedforward gas amount is corrected with the gas rising amount corrected.

In this embodiment, since the after-boil time, which changes complicatedly with the elapse of the standby time, is controlled without the complexity of formulating it with a higher-order equation, the control configuration can be extremely simplified. it can.

Even if the control structure is simplified in this way, when the experimental function data falls within the allowable range of the auxiliary boiling time, the auxiliary boiling time is used. If the control accuracy can be maintained and the experimental function data deviates from the allowable range of the auxiliary post-boiling time, the use of the auxiliary post-boiling time is stopped and the feed-forward gas of a fixed fixed amount is used without correcting the gas amount. Since the supply amount is supplied with a gas amount near the required heat amount required to raise the incoming water temperature to the set temperature, the gas amount that does not significantly deviate from the optimal start amount of feed forward gas amount is supplied. Therefore, it is possible to supply hot water having a stable hot water temperature without causing the temperature of the re-discharged hot water to deviate from the set hot water supply temperature beyond an allowable range.

Next, a second embodiment of the present invention will be described. In the second embodiment, the auxiliary post-boiling time data α is stored in the auxiliary data storage unit 23 based on the flow rate of water through the heat exchanger 2.
Is given by α = BQ + Z (B and Z are constants), and an auxiliary after-boiling-time calculating unit 27 is provided as shown by a chain line in FIG. The auxiliary boiling time calculation unit 27 receives the flow rate detection signal from the flow rate sensor 9 and uses the value of the flow rate at the start of re-hot water supply using the arithmetic expression stored in the auxiliary data storage unit 23 to calculate the auxiliary boiling time. α is obtained by calculation. The data of the permissible range attached to the post-auxiliary boiling time α obtained by the calculation is given to the auxiliary data storage unit 23, and the post-auxiliary boiling time calculation unit 27 calculates the An allowable range is added and the data is added to the after-boil time range determining unit 24. Other configurations are the same as those of the first embodiment. The second embodiment can also provide the same operation and effects as those of the first embodiment.

Next, a third embodiment of the present invention will be described. This third embodiment avoids the complexity of formulating the after-boil time of the hot water fall characteristic by a higher-order equation, and divides the standby time into a plurality as shown in FIG. 5 (3 in the case of FIG. 5). Classification)
Then, the experimental function data of the falling time constant is approximated by a linear equation for each section, the section I of the waiting time is represented by the approximate equation, the section II is represented by the linear approximation, and the section III is represented by the following equation. The experimental function data is approximated using the respective linear approximation formulas. The linear approximation formula for each section of the standby time is stored in the main data storage unit 22 in FIG. The up control is performed using a first-order approximation formula in each section. Therefore, in the third embodiment, since the auxiliary boiling time is not used, the auxiliary data storage unit 23 and the auxiliary boiling time calculation unit 27 in FIG. 1 are omitted.

In the third embodiment, the post-boiling time is obtained by using a first-order approximation formula for each section of the standby time stored in the main data storage unit 22 to correct the rising gas amount at the time of re-starting hot water. As a result, the control processing can be performed without complicating the conversion of the experimental function data of the after-boiling time into a mathematical expression using a higher-order equation, so that the control processing can be simplified similarly to the first and second embodiments. Can be achieved.

In addition, since the standby time is divided into a plurality of sections, and the experimental function data of the after-boil time is approximated by a linear expression for each section, the approximate expression in each section is approximated to substantially match the experimental function data. As a result, the accuracy of the correction control of the gas starting amount at the time of re-starting hot water is improved, and the deviation of the feed forward gas supply amount at the time of re-starting hot water can be extremely small to control the start-up amount of gas. Excellent stabilization control of the temperature becomes possible.

Next, a fourth embodiment of the present invention will be described. The fourth embodiment is different from the main data storage shown in FIG.
In FIG. 22, the experimental function data of the post-boiling time is approximated by a higher-order equation to form a mathematical expression.
22. At the time of hot water re-starting, the post-boiling time is obtained using this higher-order approximation formula, and the amount of gas rise at the time of hot water re-starting is corrected. Also in the case of the fourth embodiment, since the auxiliary boiling time is not used, the auxiliary data storage unit 23 and the auxiliary boiling time calculation unit 27 in FIG. 1 are omitted.

In the fourth embodiment, the process of formulating the experimental function data of the after-boil time into a higher-order equation becomes complicated, but once the higher-order approximation equation is obtained, the main data storage unit 22
After that, the result is the same as that of obtaining the post-boiling time using the experimental function data of the post-boiling time.
The accuracy of the gas amount startup correction at the time of hot water renewal is significantly improved, and it can be provided as a next-generation high-performance appliance.

It should be noted that the present invention is not limited to each embodiment, but can adopt various embodiments. In particular, the present invention is of a type in which exhaust and intake exchange heat,
In the case of equipment that performs post-purging after the stop of hot water supply combustion, a particularly remarkable effect is achieved.However, in other equipment, correction of the gas startup amount at the time of re-starting hot water in consideration of the post-boil time that changes according to the standby time. Since it can be performed, it is possible to accurately correct the gas rising amount of the feed forward, and it is possible to obtain an effect that the accuracy of the stabilization control of the re-hot water temperature can be significantly improved as compared with the conventional example. Become.

In the third embodiment, the standby time is divided into a plurality of sections, and a first-order approximation equation is given for each section. Is also good. In this case, there are various variations that give an approximate expression. For example, as shown in (a) of FIG. 10, an approximate expression only for the division of I is used, or as shown in (b) of FIG. It is possible to adopt various variations, such as using an approximate expression for the division of I and using a fixed value for the division of II or more. The approximation formula may be approximated using an approximation formula other than the linear approximation formula.

Further, all of the experimental function data (experimental data) need not be obtained by experiments, and it is also possible to obtain experimental values by estimating several points or empirical values.

[0046]

According to the present invention, in the configuration in which the after-boil time of the hot water fall characteristic is approximated by using the concept of the auxiliary after-boil time, the standby time from the stop of the hot water supply combustion to the next re-water discharge. To avoid the complexity of formulating the post-boil time, which varies in a complicated manner depending on the length of the hot water temperature, into a complicated higher-order equation, the actual post-boil time data (experimental function data) When included in the allowable range, since the gas starting amount at the time of re-starting hot water is corrected by using the auxiliary post-boiling time which is easily obtained by the flow rate of water flowing through the heat exchanger, the control configuration of the re-start hot water temperature is used. Can be obtained.

Further, if the data of the post-boiling time (experimental function data) is out of the allowable range of the auxiliary post-boiling time, the use of the auxiliary post-boiling time is stopped, and the required heat quantity required to raise the incoming water temperature to the set temperature. Since the fixed fixed gas amount in the vicinity is set up and supplied, the actual after-boil time data (experimental function data) will not be refilled during the standby time section outside the allowable range of the auxiliary after-boil time. Even when it is started, it is possible to supply hot water with a stable hot water temperature, and it is possible to increase the accuracy of the control for stabilizing the hot water temperature again as compared with the conventional example.

The waiting time is divided into a plurality of sections, and an approximation formula (including a first-order approximation formula) for approximating the actual after-boil time data (experimental function data) is given to at least one of the sections. In the invention in which the post-boil time is obtained by using the above, the actual post-boil time data (experimental function data) is converted into a higher-order approximation formula in the same manner as the invention using the concept of the auxiliary post-boil time. Since the control processing can be performed while avoiding the complexity of formulating, it is possible to simplify the control configuration of the temperature of the hot water. Moreover, if the standby time is divided into a plurality of parts and the actual after-boil time data is approximated by a linear expression for each division, an approximate expression can be given so as to substantially match the actual data. The post-boiling time at the time of re-starting at each standby time can be determined to be more suitable for the actual situation, thereby increasing the accuracy of correction of the starting gas amount at the time of re-starting and improving the re-starting temperature. Stabilization control becomes possible.

Further, in the invention in which the data of the actual after-boiling time (experimental function data) is given by a higher-order approximation formula, the complexity of formulating the actual after-boiling time into a higher-order approximation formula is somewhat increased. Even if there is, once the higher-order approximation formula is given, the post-boil time of the hot water temperature at the time of re-hot water can be obtained by using the higher-order approximation formula with a value corresponding to the actual post-boil time, As a result, the accuracy of the correction control of the rising gas amount at the time of re-starting hot water is remarkably improved, and it is possible to provide a high-performance next-generation appliance for stabilizing the re-starting hot water temperature.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a post-boil time in which a waiting time obtained by an experiment by the inventor is used as a variable.

FIG. 3 is a graph showing a relationship between a flow rate and a post-boil time when a standby time is fixed to a certain point in time.

FIG. 4 is an explanatory diagram showing a method for determining a post-boil time in the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a method for determining a post-boil time in a third embodiment of the present invention.

FIG. 6 is an explanatory diagram of a configuration of a water heater of a type in which an exhaust pipe 20 and an intake pipe 21 are double pipes.

FIG. 7 is a system configuration diagram of a conventional general water heater.

FIG. 8 is an explanatory diagram showing a deviation of a tapping hot water temperature from a hot water supply set temperature due to a difference between a hot water temperature rise characteristic due to a hot water temperature rising characteristic and a hot water temperature drop due to a hot water falling characteristic when re-watering.

9 is an explanatory diagram of a correction operation of a rising gas amount at the time of re-watering for correcting a deviation of the hot-water temperature shown in FIG. 8;

FIG. 10 is an explanatory diagram of another embodiment showing an example of a variation in which an approximate expression is given to one or more divided sections of a standby time.

[Explanation of symbols]

 22 Main data storage unit 23 Auxiliary data storage unit 24 After-boiling time range determination unit 25 Gas volume start-up control unit 26 Standby time measuring means 27 Auxiliary after-boiling time calculation unit

Claims (6)

[Claims] 1. A period from the stop of hot water supply combustion for performing the stabilization control of the reheated hot water temperature after the stop of hot water supply combustion is set in advance as a standby time, and within this standby time, When performing hot water supply, the hot water temperature rise corresponding to the rise of the hot water temperature after the rise delay time from the start of re-hot water and the hot water temperature corresponding to the fall of the hot water temperature after the elapse of the post-boiling time due to the flow of the hot water again In the combustion control method at the time of re-watering of a water heater that corrects the rising amount of fuel gas in a direction to cancel the difference from the decrease of the temperature, the data of the post-boiling time with the standby time as a variable is given. On the other hand, an auxiliary boiling time which is proportional to the hot water supply flow rate at the time of re-hot water supply and becomes a constant value over the entire section of the standby time is given, and an allowable range for vertically sandwiching the auxiliary boiling time is given. ,
At the time of re-watering in the section of the standby time in which the data of the post-boil time with the standby time as a variable is included in the allowable range of the auxiliary post-boil time, the gas is started by using the auxiliary post-boil time as the post-boil time. When the hot water is re-started in a section of the standby time in which the data of the post-boil time using the standby time as a variable is out of the allowable range of the auxiliary post-boil time, the correction of the gas startup amount is stopped and the correction is performed. A combustion control method at the time of re-watering of a water heater, characterized in that a fixed fixed gas amount near a feed forward gas amount required for raising a water temperature to a hot water supply set temperature is started. 2. A time period from the stop of hot water supply combustion for performing the stabilization control of the reheated hot water temperature after the stop of hot water supply combustion is set in advance as a standby time. When performing hot water supply, the hot water temperature rise corresponding to the rise of the hot water temperature after the rise delay time from the start of re-hot water and the hot water temperature corresponding to the fall of the hot water temperature after the elapse of the post-boiling time due to the flow of the hot water again In the combustion control method at the time of re-watering of a water heater that corrects the rising amount of the fuel gas in a direction to offset the difference with the decrease of the water temperature, the basic data of the after-boil time with the standby time as a variable is given. This data is divided by dividing the waiting time into a plurality of parts, and one or more of the divided parts of the waiting time are given an approximate expression obtained by approximating the basic data with an approximate expression using the waiting time as a variable. When the hot water reappears, it reappears When the hot water belongs to the divided division of the standby time given the approximate expression, a combustion control method at the time of re-watering of the water heater in which the after-boil time is obtained by the approximate expression and the amount of gas startup is corrected. 3. A period from the stop of hot water supply combustion for stabilizing control of the reheated hot water temperature at the next hot water discharge after the stop of hot water supply combustion is set in advance as a standby time. When performing hot water supply, the hot water temperature rise corresponding to the rise of the hot water temperature after the rise delay time from the start of re-hot water and the hot water temperature corresponding to the fall of the hot water temperature after the elapse of the post-boiling time due to the flow of the hot water again In the combustion control method at the time of re-watering of a water heater that corrects the rising amount of the fuel gas in a direction to offset the difference with the decrease of the water temperature, the basic data of the after-boil time with the standby time as a variable is given. This data is divided by dividing the waiting time into a plurality of parts, and a linear approximation obtained by approximating the basic data to one or more divisions among the divided divisions of the waiting time by a linear expression with the waiting time as a variable is used. Give it, and when you return A method for controlling the combustion at the time of re-watering of a water heater, in which when the re-watering time belongs to the division of the standby time given the linear approximation formula, the post-boil time is obtained by the linear approximation formula to correct the gas startup amount. 4. A period from the stop of hot water supply combustion for performing stabilization control of the reheated hot water temperature after the stop of hot water supply combustion is set in advance as a standby time. When performing hot water supply, the hot water temperature rise corresponding to the rise of the hot water temperature after the rise delay time from the start of re-hot water and the hot water temperature corresponding to the fall of the hot water temperature after the elapse of the post-boiling time due to the flow of the hot water again In the combustion control method at the time of re-watering of a water heater that corrects the rising amount of fuel gas in a direction to cancel the difference from the decrease of the water temperature, the post-boiling time data with the standby time as a variable is used as the standby time. A combustion control method at the time of re-watering of a water heater in which the time is given as a higher-order approximation formula and a time of reheating is calculated by using the higher-order approximation formula to calculate the post-boil time and correct the rising amount of gas. 5. A period from the stop of hot water supply combustion for stabilizing control of the temperature of the hot water supply after the stop of hot water supply combustion is set in advance as a standby time. When performing hot water supply, the hot water temperature rise corresponding to the rise of the hot water temperature after the rise delay time from the start of re-hot water and the hot water temperature corresponding to the fall of the hot water temperature after the elapse of the post-boiling time due to the flow of the hot water again In a water heater with a combustion control device, which corrects the rising amount of fuel gas in a direction to cancel the difference from the decrease of the fuel gas and burns, the main data storage in which data of the after-boil time with the standby time as a variable is given. The auxiliary post-boil time which is proportional to the hot water supply flow rate at the time of re-hot water supply and is constant in the entire section of the standby time, and the data of the allowable range sandwiching the auxiliary post-boiling time up and down are the sizes of the respective hot water flow rates. Supplement given for each The auxiliary data storage unit obtains detection information of the hot water supply flow rate at the start of re-hot water supply, compares the data of the auxiliary post-heating time of the auxiliary data storage unit corresponding to the detected hot water supply flow rate with the data of the main data storage unit, and reads the data again. A post-boil time range determining unit that determines whether or not the value of the data in the main data storage unit at the start of tapping is within the allowable range of the auxiliary post-boil time; If the data value in the data storage unit is within the allowable range of the auxiliary boiling time, the auxiliary boiling time is adopted as the post-boiling time to correct the gas startup amount, and the data value in the main data storage unit is If the post-assistance boiling time is out of the permissible range, a fixed fixed amount of gas near the feedforward gas amount required to stop the correction of the gas startup amount and raise the incoming water temperature to the hot water supply set temperature Combustion control system with a water heater and a gas amount rising controller launch. 6. The auxiliary data storage section is provided with an auxiliary post-boiling time which is constant over the entire standby time interval using the hot water supply flow rate as a variable, and obtains information on the hot water supply flow rate at the time of re-starting hot water to calculate the auxiliary post-boiling time. The water heater with a combustion control device according to claim 5, wherein the water heater is configured to be determined by the following formula.