JPH11218356A - Combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To estimate delivery hot water temperature of a heat exchanger accurately. SOLUTION: A contribution rate K1' is detected when the delivery hot water temperature of a heat exchanger estimated based on a contribution rate determined from a contribution rate data shown by a solid line L depending on the combustion heat quantity of a burner deviated from a measured delivery hot water temperature and then a contribution rate K2' is detected when the burner is burning with a heat quantity separated by a predetermined extent or more than the heat quantity P1 at the time of determining the contribution rate K1'. Based on the contribution rates K1', K2' and corresponding combustion heat quantities P1, P2, inclination in the variation of contribution rate with respect to the variation of combustion heat quantity is detected and the inclination of contribution rate data is corrected by shifting the rates K1, K2 of the contribution rate data of corresponding heat quantities P1, P2 to match the K1' K2'. Delivery hot water temperature of the heat exchanger is estimated based on a corrected contribution rate data shown by a dashed line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for producing hot water and supplying hot water.

[0002]

2. Description of the Related Art FIG. 10 is a model diagram showing an example of a system configuration of a water heater as a combustion device. This water heater has a burner 1 and a hot water supply heat exchanger 2 as shown by a solid line in the figure, and guides water from a water supply source to the hot water supply heat exchanger 2 on the inlet side of the hot water supply heat exchanger 2. Water supply passage 3 is connected to the water supply passage, and one end of a hot water supply passage 4 is connected to the outlet side of the hot water supply heat exchanger 2, and the other end of the hot water supply passage 4 is led to a hot water supply place such as a kitchen or a shower. ing. The water supply passage 3 has an inlet water thermistor 5 as an inlet water temperature detecting means for detecting the water temperature of the passage 3, and a water flow sensor F for detecting a flow rate of the water.
S is provided in the hot water supply passage 4, and a tapping thermistor 6 is provided in the hot water supply passage 4 as outlet side hot water temperature detecting means for detecting the temperature of hot water supplied from the passage 4.

A gas supply passage 8 for guiding fuel gas to the burner 1 is connected to the burner 1, and the gas supply passage 8 is connected to solenoid valves 10, 11 for opening and closing the passage.
And a proportional valve 12 for controlling the amount of fuel gas supplied to the burner 1 with the valve opening.

[0004] The water heater is provided with a control device 13 for controlling the hot water supply operation. The control device 13 is connected to a remote controller 14 provided with a hot water temperature setting means for setting the hot water temperature by signal connection. . The control device 13 controls the hot water supply operation as follows. For example, a hot-water tap (not shown) provided at the tip side of the hot-water supply passage 4 led to the kitchen, a shower, or the like is opened, and the flow of the water in the water supply passage 3 is detected by a water amount sensor FS.
, The solenoid valves 10 and 11 are opened to supply fuel gas from the gas supply passage 8 to the burner 1 to start burner combustion, and the temperature of hot water to be supplied is set in the remote controller 14. The amount of combustion heat of the burner 1 is controlled by controlling the valve opening of the proportional valve 12 (that is, by controlling the amount of fuel gas supplied to the burner 1) so as to reach the set temperature. The hot water supply heat exchanger 2 is heated by this to make hot water, and the hot water is supplied to a desired hot water supply place through the hot water supply passage 4. Then, when the hot water tap is closed and the water supply of the water supply passage 3 is stopped, the water amount sensor FS is used.
Is detected, the solenoid valve 11 is closed to stop burning the burner 1, and the hot water supply operation is terminated.

[0005]

Incidentally, as one method of controlling the amount of combustion heat of the burner 1 for supplying hot water at a set hot water supply temperature, there is proportional control using both feedforward control and feedback control. When performing the above-described proportional control, for example, the incoming water temperature T
in, the water flow rate Q by the water flow sensor FS, the hot water temperature Tout by the hot water thermistor 6, and the hot water set temperature Tsp from the remote controller 14. Feed forward heat quantity Pff (Pff = (Tsp−Tin) × Q /
η (η is a predetermined thermal efficiency of the hot water supply heat exchanger 2) and a feedback heat amount Pfb (Pfb = P × (Tsp−) for correcting a deviation of the tapping temperature Tout from the hot water supply set temperature Tsp.
(Tout) × Q / η (P is a proportional constant)), and controls the valve opening of the proportional valve 12 so that the burner 1 performs combustion so as to control the combustion heat of the burner 1.

However, if the proportional control is performed using the tap water temperature Tout detected by the tap water thermistor 6 as described above, for example, for some reason, the hot water temperature in the hot water supply heat exchanger 2 becomes equal to the set hot water supply temperature Tsp. When the temperature of the hot water deviates from the temperature for supplying hot water, the temperature of the hot water fluctuates, and the temperature of the hot water fluctuates. It takes time until the control is performed, which causes a problem that the response of the combustion heat quantity control to the fluctuation of the hot water temperature Tout is poor.

As described above, when the response of the combustion heat quantity control is poor, there is a problem that it takes time to converge the fluctuation of the hot water temperature Tout, and the user of the hot water feels discomfort with the fluctuation of the hot water temperature. May be provided.

Accordingly, the present applicants have proposed the following means as means for improving the responsiveness of the combustion heat control. For example, a heat exchanger thermistor 15 is provided as a heat exchanger hot water temperature detecting means as shown by a dotted line in FIG. 10 for detecting the temperature of the hot and cold water flowing through the hot water supply heat exchanger 2, and the hot water temperature detected by the heat exchange thermistor 15 is provided. Based on Tz1, the incoming water temperature Tin detected by the incoming water thermistor 5, and the predetermined contribution ratio K, the temperature of the hot water flowing out of the hot water supply heat exchanger 2 is estimated by the calculation of the following equation (1). Exit hot water temperature T
Instead of using the hot water temperature Tout measured and detected by the tapping thermistor 6 instead of using the hot water temperature Tout actually measured by the hot water supply thermistor 6, the combustion heat amount is calculated by proportional control based on the hot water temperature Tkaso on the outlet side of the hot water supply heat exchanger 2 detected and detected. It is proposed to take control.

Tkaso = (Tz1−Tin) / K + Tin (1)

The above-mentioned contribution rate K is the hot water temperature detecting portion of the heat exchange thermistor 15 from the input side of the hot water supply heat exchanger 2 to the heat absorption heat Ptl received by the hot water from the input side to the output side of the hot water supply heat exchanger 2. (K = Pz1 / Ptl).

As described above, the hot water temperature Tkaso on the outlet side of the hot water supply heat exchanger 2 is estimated based on the hot water temperature Tz1 detected by the heat exchange thermistor 15, and proportional control based on the estimated hot water temperature Tkaso on the outlet side is performed. By doing so, for example, the hot water supply heat exchanger 2
When the temperature of the hot water inside the hot water deviates from the hot water temperature for supplying hot water at the hot water supply set temperature Tsp, the proportional control for correcting the fluctuation of the hot water temperature is immediately performed, and the hot water supply heat exchanger 2
It is possible to remarkably improve the responsiveness of the combustion heat control to the variation of the hot water temperature caused by the variation of the hot water temperature in the inside.

However, as described above, the outlet-side hot water temperature Tkaso estimated and detected may deviate from the actual outlet-side hot water temperature Tout. In such a case, hot water supply is performed by an amount corresponding to the deviation amount. Hot water temperature T at a temperature that deviates from the set temperature Tsp
out becomes stable, and there is a problem that hot water at the hot water supply set temperature Tsp cannot be supplied stably.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to improve the responsiveness of combustion heat quantity control with respect to fluctuations in tapping water temperature and to accurately set the tapping water temperature to a set hot water supply temperature. It is to provide a combustion device that can be controlled.

[0014]

Means for Solving the Problems To achieve the above object, the present invention provides means for solving the above problems with the following constitution. That is, the first invention is a heat exchanger that heats water supplied from a water supply passage to produce hot water and discharges the hot water, a burner that burns and heats the heat exchanger, and a heat exchanger that is supplied to the heat exchanger. Incoming water temperature detecting means for detecting the incoming water temperature, outlet water temperature detecting means for actually measuring the outlet water temperature flowing out of the heat exchanger, and a heat exchanger hot water temperature for detecting the hot water temperature in the heat exchanger. Detecting means is provided, from the inlet side of the heat exchanger to the amount of heat absorbed by the hot water from the inlet side to the outlet side of the heat exchanger to the hot water temperature detecting portion of the heat exchanger hot water temperature detecting means. The contribution rate, which is the ratio of the amount of heat absorbed by the hot and cold water, is given by contribution rate data corresponding to the magnitude of the combustion heat quantity of the burner, and the contribution rate obtained based on the contribution rate data according to the combustion heat quantity and the heat Hot water temperature and incoming water temperature detected by exchanger hot water temperature detecting means A heat exchanger outlet hot water temperature estimation and detection unit for estimating and detecting the outlet water temperature of the heat exchanger based on the incoming water temperature detected by the stage; A combustion device capable of controlling the amount of combustion heat of a burner based on the detected outlet hot water temperature, wherein the heat exchanger outlet hot water temperature estimation is based on the outlet hot water temperature actually measured by the outlet hot water temperature detecting means. The above-mentioned problem is solved by a configuration in which a contribution rate data correction section for correcting the contribution rate data based on the deviation amount of the outlet hot water temperature estimated and detected by the detection section is provided.

According to a second aspect of the present invention, there is provided a heat exchanger that heats water supplied from a water supply passage to produce hot water and discharges the hot water, a burner that burns and heats the heat exchanger, and supplies the heat to the heat exchanger. Incoming water temperature detecting means for detecting the incoming water temperature to be supplied, outlet water temperature detecting means for actually measuring the outlet hot water temperature flowing out of the heat exchanger, and a heat exchanger hot water detecting the hot water temperature in the heat exchanger. Temperature detecting means is provided, from the inlet side of the heat exchanger to the amount of heat absorbed by the hot water from the inlet side to the outlet side of the heat exchanger, from the inlet side of the heat exchanger to the hot water temperature detecting portion of the heat exchanger hot water temperature detecting means. The contribution rate, which is the ratio of the amount of heat absorbed by the hot and cold water, is given by the contribution rate data corresponding to the magnitude of the combustion heat quantity of the burner, and the contribution rate obtained based on the contribution rate data according to the combustion heat quantity and the above Hot water temperature and incoming water temperature detected by the heat exchanger hot water temperature detecting means Means for estimating and detecting the outlet hot water temperature on the outlet side of the heat exchanger based on the incoming water temperature detected by the means. A burner capable of controlling the amount of combustion heat of a burner based on the detected outlet hot water temperature, wherein the outlet hot water temperature actually measured by the outlet hot water detection means during burner combustion, and a heat exchanger. Based on the hot water temperature detected by the hot water temperature detecting means and the incoming water temperature detected by the incoming water temperature detecting means, when the contribution rate data correction command is issued, the above-mentioned contribution rate is obtained. When the burner is performing combustion with a combustion heat amount that is at least a predetermined range from the combustion heat amount of the burner at the time when the combustion ratio is obtained, a contribution ratio detection unit for obtaining the contribution ratio again; Calculated contribution rates and their contribution rates A slope detector for calculating the slope of the change in the contribution rate with respect to the change in the combustion heat based on the heat of combustion at the time; and correcting the slope of the contribution data to the slope obtained by the slope detector. A contribution data correction unit that corrects the contribution data by moving the contribution of the corresponding contribution data of the combustion heat amount in a direction corresponding to each of the above calculated contributions. It is a means to solve.

According to a third aspect of the present invention, there is provided a heat exchanger that heats water supplied from a water supply passage to produce hot water and discharges the hot water, a burner that burns and heats the heat exchanger, and supplies the heat to the heat exchanger. Incoming water temperature detecting means for detecting the incoming water temperature to be supplied, outlet water temperature detecting means for actually measuring the outlet hot water temperature flowing out of the heat exchanger, and a heat exchanger hot water detecting the hot water temperature in the heat exchanger. Temperature detecting means is provided, from the inlet side of the heat exchanger to the amount of heat absorbed by the hot water from the inlet side to the outlet side of the heat exchanger, from the inlet side of the heat exchanger to the hot water temperature detecting portion of the heat exchanger hot water temperature detecting means. The contribution rate, which is the ratio of the amount of heat absorbed by the hot and cold water, is given by the contribution rate data corresponding to the magnitude of the combustion heat quantity of the burner, and the contribution rate obtained based on the contribution rate data according to the combustion heat quantity and the above Hot water temperature and incoming water temperature detected by the heat exchanger hot water temperature detecting means Means for estimating and detecting the outlet hot water temperature on the outlet side of the heat exchanger based on the incoming water temperature detected by the means. A combustion device capable of controlling the amount of combustion heat of the burner based on the detected outlet hot water temperature, wherein the hot water temperature detected by the heat exchanger hot water temperature detecting means and the hot water temperature detected by the outlet hot water temperature detecting means are detected. Based on the outlet side hot water temperature and the incoming water temperature detected by the incoming water temperature detecting means, a contribution rate is obtained when the burner is burning at a predetermined set combustion heat quantity, and thereafter, A contribution ratio detection unit for obtaining a contribution ratio when burner combustion is performed with a combustion heat amount separated by a predetermined combustion heat amount; each contribution ratio obtained by the contribution ratio detection unit; Change in the amount of combustion heat based on the amount of combustion heat A slope detector for calculating a slope of a change amount of the contribution rate with respect to the amount; correcting the slope of the contribution rate data to the slope obtained by the slope detector, and calculating a contribution rate of the corresponding contribution rate data of the combustion heat amount. And a contribution data correction unit that corrects the contribution data by moving in a direction corresponding to each of the obtained contributions as a means for solving the above problem.

According to a fourth aspect of the present invention, there is provided the first, second or third aspect.
The contribution ratio data correction unit constituting the invention according to the present invention is configured to estimate the outlet-side hot-water temperature of the heat-exchanger with respect to the outlet-side hot-water temperature actually measured by the outlet-side hot-water temperature detector during a period in which the hot water temperature flowing out of the heat exchanger is stable. The above-mentioned problem is solved by a configuration in which the contribution rate data is corrected only when the deviation amount of the outlet hot water temperature estimated and detected by the detection unit is out of a predetermined allowable range.

In the invention having the above structure, for example, the contribution rate is given by contribution rate data corresponding to the magnitude of the combustion heat quantity of the burner, and the heat exchanger outlet hot water temperature estimation detection unit detects Hot water at the outlet side of the heat exchanger based on the contribution rate determined from the contribution rate data, the hot water temperature detected by the heat exchanger hot water temperature detecting means, and the incoming water temperature detected by the incoming water temperature detecting means. The temperature is estimated and detected.

It has been found by the present inventors that the contribution rate varies according to the magnitude of the heat of combustion. Therefore, as described above, the contribution rate of the heat exchanger is determined using the contribution rate corresponding to the magnitude of the heat of combustion. By estimating and detecting the outlet-side hot water temperature, it is possible to estimate and detect the outlet-side hot-water temperature of the heat exchanger almost accurately. Problems caused by deviation from the hot water temperature on the side are substantially avoided.

In addition, in addition to the above configuration, the present invention includes a contribution data correction unit for correcting the contribution data while using the combustion equipment. The contribution rate data correction unit corrects the contribution rate data according to a deviation amount of the estimated and detected outlet water temperature from the actually measured outlet water temperature. Alternatively, the contribution rate data correction unit obtains contribution rates respectively corresponding to two different amounts of combustion heat, and corrects the contribution rate data using the obtained contribution rates. As described above, the present invention has a function of learning contribution rate data. For example, it is conceivable that the input water temperature and the like are significantly different between summer and winter, and the above-mentioned contribution ratio is considered to change even if the amount of combustion heat is the same due to such environmental change. Can be corrected by the contribution data correction unit.

From the above, when the contribution rate changes due to an environmental change or the like and the estimated and detected outlet water temperature deviates from the actually measured outlet water temperature, the contribution rate data is immediately corrected. Is performed, the estimated and detected outlet water temperature is corrected in a direction corresponding to the actually measured outlet water temperature, and the estimated and detected outlet water temperature is changed to the actual outlet water temperature. The state in which the hot water is not supplied is not continued, and the problem that the temperature of the hot water is stabilized at a temperature that is different from the hot water supply set temperature is prevented.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

The combustion apparatus according to the first embodiment has a pipe configuration shown in FIG. 10, and a heat exchange thermistor 15 as a heat exchanger hot water temperature detecting means for detecting the hot water temperature in the hot water supply heat exchanger 2. Is provided. By the way, FIG. 11 shows a model example of the structure of the hot water supply heat exchanger, and as shown in FIG. 11, the hot water supply heat exchanger 2 is formed to bend at the lower stage near the combustion flame of the burner 1. The pipe 17 is connected to a pipe 18 which is bent at the upper stage on the side farther from the combustion flame of the burner 1, and these pipes 17 and 18 have a configuration inserted through a fin plate 19. In the embodiment, from the viewpoint of the pipeline strength, the amount of heat received from the burner combustion flame when the burner 1 is burned with a predetermined maximum combustion heat amount becomes equal over the entire area of the lower and upper pipelines 17 and 18. The notch 16 and the like of the fin plate 19 are configured as described above, and the water supplied from the water supply passage 3 is supplied to the lower pipeline 17.
After passing through the heat exchanger thermistor 15 is formed so as to flow into the hot water supply passage 4 through the upper pipeline 18.
Is provided so as to detect the temperature of the hot water at the U-shaped pipe portion in the lower pipeline 17 as shown by the broken line in FIG. In addition, since the description of the pipe configuration of the water heater shown in FIG. 10 other than the above has been described above, the overlapping description will be omitted.

FIG. 1 is a block diagram showing a characteristic control configuration in the first embodiment. As shown in the figure, the control device 13 shown in the first embodiment example
Are a hot water temperature monitoring unit 20, a shift amount detection unit 21, a heat exchanger outlet hot water temperature estimation detection unit 22, a correction command unit 23, a data storage unit 24, a contribution rate data correction unit 25, The heat amount control unit 26 is provided.

In some cases, the outlet temperature Tkaso estimated and detected as described above deviates from the actual outlet temperature Tout, and the present inventors have investigated the cause. It has been found that the estimated and detected outlet-side hot water temperature Tkaso deviates from the actual outlet-side hot water temperature Tout due to the variation in accordance with the amount of heat.

This is because when the burner 1 is burning near the predetermined maximum combustion heat, the combustion flame rises greatly, so that the heat of the combustion flame is not only transmitted to the lower pipe 17 but also to the upper pipe. The water flow per unit flow flowing through the lower pipe 17 absorbs heat from the combustion flame, and the water flow per unit flow flowing through the upper pipe 18 absorbs heat from the combustion flame. Although the heat quantity is almost equal to the heat quantity, the combustion flame becomes smaller as the combustion heat quantity becomes smaller. For example, the combustion flame is very small near the predetermined minimum combustion heat quantity, and the heat of the combustion flame is almost added to the upper pipe 18. Most of the heat absorbed by the entire hot water supply heat exchanger 2 from the combustion flame is not
At 7, heat is absorbed. From this, the contribution K of the heat exchange thermistor 15 provided in the lower pipeline 17 at the hot water temperature detection site increases as the amount of combustion heat decreases, as indicated by the solid line L in FIG. is there.

In this embodiment, the predetermined minimum combustion heat amount is set to 0%, and as the combustion heat amount increases, the% value increases and the predetermined maximum combustion heat amount becomes 100%.
The amount of combustion heat is replaced with% value so as to be%.

As described above, it has been found that the contribution rate K varies in accordance with the magnitude of the amount of combustion heat, so in this embodiment, as shown by the solid line L in FIG. The data of the contribution rate K thus obtained is obtained in advance by experiments, calculations, and the like, and is stored in the data storage unit 24 as contribution rate data. In this embodiment, the contribution data is represented by a linear function.

The combustion heat quantity control unit 26 performs proportional control as described above so that hot water at the hot water set temperature Tsp set by the remote controller 14 can be supplied.
The heat exchanger outlet hot water temperature estimation detection unit 22 is configured to control the valve opening degree of the burner 2 to control the amount of combustion heat of the burner. The contribution rate corresponding to the taken-in combustion heat quantity is obtained from the contribution rate data in the data storage unit 24, and the hot water temperature Tz1 in the hot water supply heat exchanger 2 from the heat exchange thermistor 15 is calculated as follows:
The incoming water temperature Tin is taken in from the incoming water thermistor 5, and based on the contribution rate K corresponding to the amount of combustion heat, the hot water temperature Tz1, and the incoming water temperature Tin, the above equation (1) (Tkaso = (Tz1
−Tin) / Ksp + Tin), the hot water supply heat exchanger 2
Of the outlet-side hot water temperature Tkaso is estimated and detected, and information on the estimated and detected outlet-side hot water temperature Tkaso is output to the combustion heat quantity control unit 26.

As described above, the combustion calorie control unit 26
A configuration is provided in which the amount of combustion heat of the burner 1 is controlled so that hot water at the hot water supply set temperature Tsp can be supplied. In this embodiment, the heat exchanger outlet side hot water temperature estimation detection unit 22 estimates and detects the heat. The combustion heat amount can be controlled based on the output hot water temperature Tkaso. An example is shown below.

For example, as shown in FIG. 8, the combustion heat amount control unit 26 includes a deviation detection unit 27, a combustion heat amount control switching unit 28, a measured hot water temperature adoption type combustion heat amount control unit 30, and an estimated hot water temperature adoption type. And a combustion calorie control unit 31.

The actually measured hot water temperature adoption type combustion calorie control unit 30 takes in the hot water temperature Tout on the outlet side of the hot water supply heat exchanger 2 measured by the hot water thermistor 6, and calculates the proportionality based on the actually measured hot water temperature Tout on the outlet side. The amount of combustion heat is controlled by the control. When the combustion calorie control is performed by the combustion calorie control unit 30 employing the actually measured hot water temperature, the actually measured hot water temperature is used, so that the combustion heat amount is accurately controlled in a direction in which the hot water temperature matches the hot water supply set temperature Tsp. can do.

The estimated hot water temperature adoption type combustion calorie control unit 31 takes in the outlet hot water temperature Tkaso estimated and detected by the heat exchanger outlet hot water temperature estimation detecting unit 22 and outputs the estimated hot water temperature on the outlet side. It has a configuration in which the amount of combustion heat is controlled by the proportional control based on Tkaso. When performing the combustion heat amount control by the estimated hot water temperature adoption type combustion heat amount control unit 31, when the hot water temperature in the hot water supply heat exchanger 2 deviates from the hot water temperature for discharging hot water at the hot water supply set temperature Tsp, Immediately, the fluctuation of the hot water temperature is corrected by the above-mentioned proportional control, so that the responsiveness of the combustion heat quantity control to the fluctuation of the hot water temperature can be remarkably improved.

In this embodiment, the combustion heat quantity control unit 30 adopting the measured hot water temperature and the combustion heat quantity control unit 3 adopting the estimated hot water temperature are used.
Numeral 1 performs combustion heat quantity control using a PID control method based on a combination of proportionality, integration, and differentiation. The above PID
Since the description of the control method is known, the description is omitted.

The deviation detector 27 takes in the hot water supply set temperature Tsp set on the remote controller 14 and the outlet hot water temperature Tkaso estimated and detected by the heat exchanger outlet hot water temperature estimation detector 22. The obtained hot water supply set temperature Tsp is subtracted from the estimated hot water supply temperature Tkaso to obtain a deviation ΔT of the estimated hot water supply temperature Tkaso with respect to the hot water supply set temperature Tsp.
Output to

In this embodiment, the control of the combustion heat quantity by the combustion heat quantity control section 30 employing the measured hot water temperature and the control of the combustion heat quantity by the combustion heat quantity control section 31 employing the estimated hot water temperature are represented by the deviation Δ
FIG. 9 shows a configuration for switching according to the size of T.
From the lower limit hk1 (for example, −3 ° C.) to the upper limit hj1
The range ΔHsy up to (for example, + 3 ° C.) is set as a setting range for determining a switch from the combustion heat amount control by the measured hot water temperature-based combustion heat amount control unit 30 to the combustion heat amount control by the estimated hot water temperature-based combustion heat amount control unit 31. Further, the range ΔHzy from the lower limit value hk2 (for example, -1 ° C.) to the upper limit value hj2 (for example, + 1 ° C.) shown in FIG. 9 is actually measured from the combustion heat amount control by the estimated hot water temperature adoption type combustion heat amount control unit 31. It is set as a setting range for determining the switching to the combustion heat amount control by the hot water temperature adoption type combustion heat amount control unit 30.

The combustion heat quantity control switching section 28 fetches each operation information of the measured hot water temperature adopted combustion heat quantity control section 30 and the estimated hot water temperature adopted combustion heat quantity control section 31, and based on the measured information, the measured hot water temperature adopted combustion heat quantity. When the control unit 30 detects that the combustion calorie control is being performed, the deviation detection unit 2
7 is compared with the set range ΔHsy to determine whether the difference ΔT is within the set range ΔHsy. If it is determined that the difference ΔT is within the set range ΔHsy, The temperature is almost the hot water supply set temperature Tsp, and it is determined that the combustion heat quantity control based on the actually measured outlet-side hot water temperature Tout is to be performed in order to accurately control the outlet hot water temperature to the hot water supply set temperature Tsp. The combustion calorie control by the temperature adoption type combustion calorie controller 30 is continuously performed.

When it is determined that the deviation ΔT is out of the set range ΔHsy, the combustion heat quantity control switching unit 28 determines that the temperature of the hot water is significantly deviated from the set hot water supply temperature Tsp, and It is determined that it is necessary to perform the combustion calorie control by the estimated hot water temperature-based combustion calorie control unit 31 in order to recover the fluctuation with good responsiveness. Calorie control unit 31
The combustion heat control is switched to.

When the combustion heat control switching unit 28 detects that the combustion heat control by the estimated hot water temperature-based combustion heat control unit 31 is being performed, the deviation ΔT added from the deviation detection unit 27 is set to the above-mentioned value. In comparison with the range ΔHzy, it is determined whether or not the deviation ΔT is within the set range ΔHzy, and when it is determined that the deviation ΔT is out of the set range ΔHzy, the tap water temperature is larger than the hot water supply set temperature Tsp. It is determined that the state is shifted, and the estimated calorie temperature adoption type combustion calorie control unit 31 is caused to continuously perform the combustion calorie control,
When it is determined that the deviation ΔT is within the set range ΔHzy, the variation of the tapping water temperature is substantially suppressed, so that the combustion heat quantity control by the actually measured hot water temperature adoption type combustion heat quantity control unit 30 is performed to accurately control the tapping water temperature. When it is determined that it is necessary to match the set hot water supply temperature Tsp, the combustion heat amount control is switched from the estimated hot water temperature adoption type combustion heat amount control unit 31 to the measured hot water temperature adoption type combustion heat amount control unit 30.

In this embodiment, when the combustion heat amount is controlled by the estimated hot water temperature adoption type combustion heat amount control section 31, it is assumed that the outlet hot water temperature is estimated to fluctuate greatly beyond the allowable range of the hot water supply set temperature Tsp. Therefore, it is necessary to increase the control amount of the amount of combustion heat in order to greatly change the temperature of the hot water to the hot water supply set temperature Tsp and quickly approach the hot water supply set temperature Tsp, and this is the PID constant of the PID control. One or more constants among the proportional constant, the integral constant, and the differential constant are set large. Further, when the combustion calorie control is performed by the actually measured hot water temperature adoption type combustion calorie control unit 30, since the hot water temperature is a temperature near the hot water supply set temperature Tsp,
In order to reduce the control amount of the combustion heat amount and finely control the hot water temperature to make it accurately coincide with the hot water supply set temperature, the PI measured by the combustion heat amount control unit 30 adopting the actually measured hot water temperature is used.
The PID constant of the D control is set to be smaller than the PID constant of the PID control by the estimated hot water temperature adoption type combustion calorie control unit 31.

An example of the switching operation of the combustion heat control switching section 28 will be briefly described. For example, the temperature of the hot water in the hot water supply heat exchanger 2 fluctuates from a state in which the hot water temperature is stable at the hot water supply set temperature Tsp by the combustion heat amount control by the actually measured hot water temperature adoption type combustion heat amount control unit 30, and the deviation ΔT is reduced. Point A shown in FIG.
When it is detected that the temperature has become larger than the hot water supply temperature Tsp, the combustion heat amount control switching unit 28 estimates from the combustion heat amount control unit 30 employing the measured hot water temperature. The control of the combustion heat quantity is switched to the combustion temperature control section 31 employing the hot water temperature. Thereafter, when it is detected that the tap water temperature is corrected toward the hot water supply set temperature Tsp by the combustion heat amount control of the estimated hot water temperature adoption type combustion heat amount control unit 31 and the deviation ΔT is reduced to the point B or less, the tap water temperature is detected. Determines that the temperature has recovered to a temperature near the hot water supply set temperature Tsp, and the combustion heat quantity control switching section 28 switches the estimated hot water temperature-based combustion heat quantity control section 31 to the measured hot water temperature-based combustion heat quantity control section 30.
The combustion heat quantity control is switched to the hot water supply temperature T
A small amount of combustion heat control is performed so as to match sp.

As described above, when it is determined that the hot water temperature in the hot water supply heat exchanger 2 fluctuates and the hot water temperature deviates greatly from the hot water supply set temperature Tsp, the combustion heat amount control unit 3 employing the estimated hot water temperature.
When the hot water temperature in the hot water supply heat exchanger 2 is estimated to fluctuate greatly from the hot water temperature for supplying hot water at the hot water supply set temperature Tsp, and the hot water temperature fluctuation is assumed to occur, Immediately after the hot water temperature fluctuation in the hot water supply heat exchanger 2 occurs, the hot water temperature fluctuation is corrected by the combustion heat amount control by the estimated hot water temperature adopting type combustion heat amount control section 31, and the combustion for the hot water temperature fluctuation is performed. The responsiveness of the calorific value control can be remarkably improved, and it is possible to suppress the fluctuation of the hot water temperature in a very short time and to recover the hot water supply set temperature Tsp substantially.

When it is determined that the temperature of the hot water is the set hot water supply temperature Tsp or a temperature close to the temperature Tsp, the combustion heat amount control unit 30 using the measured hot water temperature adoption type combustion heat amount control unit 30 performs the combustion heat amount control. Set hot water temperature to hot water supply temperature T
It is possible to reliably supply hot water at the hot water supply set temperature Tsp so that the hot water is stably supplied at the hot water supply set temperature Tsp, thereby avoiding the problem that the hot water temperature becomes stable at the hot water temperature deviating from the hot water supply set temperature Tsp as described above. Can be.

Further, a combustion calorie control unit 3 employing a measured hot water temperature.
Since the PID constant used for the control of the combustion heat quantity of 0 is set small, when the hot water at the hot water supply set temperature is almost discharged, the control amount of the combustion heat quantity by the actually measured hot water temperature adoption type combustion heat quantity control unit 30 is small, and Can be fluctuated small, and as a result, the hot water temperature can be changed to the hot water set temperature Tsp.
It is easy to accurately match with.

Further, an estimated hot water temperature adoption type combustion calorie control unit 3
Since the PID constant used for the control of the amount of combustion heat is set to a large value, when the temperature of the tap water deviates significantly from the set hot water supply temperature Tsp, the control amount of the combustion heat by the estimated heat temperature adoption type combustion heat amount control unit 31 is large. Set the temperature to the hot water supply temperature Tsp
And the temperature of the hot water can be brought closer to the hot water supply set temperature Tsp earlier.

In the above example of the combustion heat control, the upper limit hj2 of the range ΔHzy to the upper limit hj of the range ΔHsy shown in FIG.
The region of the deviation ΔT up to j1 and the region of the deviation ΔT from the lower limit hk2 of the range ΔHzy to the lower limit hk1 of the range ΔHzy are the combustion heat amount control by the measured hot water temperature adoption type combustion heat amount control unit 30 and the estimated hot water temperature adoption. Although the combustion heat amount control by the combustion heat amount control unit 31 overlaps with the combustion heat amount control by the measured hot water temperature-based combustion heat amount control unit 30, the combustion heat amount by the estimated hot water temperature-based combustion heat amount control unit 31 It is not necessary to provide an area where control overlaps.

For example, the region where the deviation ΔT shown in FIG. 9 is equal to or larger than hk2 and smaller than hj2 is a range in which the combustion calorie control using the actually measured hot water temperature-based combustion calorie controller 30 is performed.
Is the range of hj2 or more and less than hj1, and the range of jk1 or more and less than hk2 are the ranges in which the combustion heat amount control is performed by the estimated hot water temperature adoption type combustion heat amount control unit 31, and the other regions of the deviation ΔT are feedforward control. May be set as a range in which the combustion heat amount control is performed. In this case, in addition to the combustion water calorie control unit 30 adopting the measured hot water temperature and the combustion calorie control unit 31 adopting the estimated hot water temperature, the flow of the detected flow rate of the water flow sensor FS having the detected water input temperature of the water input thermistor 5 is set to the hot water supply. A feedforward combustion calorie control unit is provided for performing combustion calorie control based on the feedforward combustion calorie necessary to increase the temperature, and based on the above data, the measured hot water temperature adoption type combustion heat quantity control unit 30 and the estimated hot water temperature adoption type combustion heat quantity The switching between the control unit 31 and the feedforward combustion calorie control unit is controlled.

As described above, although the hot water temperature Tkaso on the outlet side of the hot water supply heat exchanger 2 is estimated and detected using the contribution rate K corresponding to the amount of combustion heat, it is estimated and detected. The outlet water temperature Tkaso may slightly deviate from the actual outlet water temperature Tout. The contribution ratio is affected by changes in the surrounding environment, such that the temperature Tin of water supplied to the hot water supply heat exchanger 2 becomes extremely low in winter and the temperature of water input Tin in summer becomes high. It can be seen that this is due to a slight change in K. Therefore, in this embodiment, a learning function for automatically correcting the contribution ratio data is provided. Hereinafter, a control configuration of automatic correction of the contribution rate data characteristic of this embodiment will be described.

The tapping temperature monitoring unit 20 includes a tapping thermistor 6
The hot water temperature Tout on the delivery side actually measured is taken in every moment, and the hot water temperature Tout is monitored.

The displacement amount detecting section 21 detects the outlet hot water temperature Tout actually measured by the hot water thermistor 6 and the outlet hot water temperature Tkaso estimated and detected by the heat exchanger outlet hot temperature estimating detecting section 22.
And the estimated outlet hot water temperature Tout is subtracted from the actually measured outlet hot water temperature Tout to obtain the estimated outlet hot water temperature Tkaso with respect to the actually measured outlet hot water temperature Tout. Is obtained.

The correction command section 23 is provided with the tapping temperature monitoring section 2.
The temperature of the tap water monitored by 0 is a predetermined time Δt (for example, 5 seconds), and a predetermined temperature range Δ as shown in FIG.
ht (for example, 1 ° C. width), and in a state where it is detected that the temperature of the tap water is stable, the shift amount ΔZ detected by the shift amount detecting unit 21 is a predetermined tolerance. When the value deviates from the range ΔS (for example, 0.5 ° C.), it is determined that the contribution data needs to be corrected, and a contribution data correction command is output to the contribution data correction unit 25.

Upon receiving the contribution data correction command, the contribution data correction unit 25 fetches the deviation ΔZ detected by the deviation detection unit 21 and corrects the contribution data based on the deviation ΔZ. The correction data and the contribution data provided in advance are read from the data storage unit 24, and the contribution data is corrected based on the shift amount ΔZ and the correction data.

Specifically, for example, the data of the shift amount corresponding to the shift amount ΔZ is used as the correction data as the correction data.
And the contribution rate data correction unit 25 compares the acquired shift amount ΔZ with the correction data to obtain the shift amount ΔZ.
, And the contribution rate data as shown by the solid line L in FIG.
For example, the correction is performed as shown by a chain line L ′ in FIG.

The contribution data correction unit 25 overwrites the contribution data corrected as described above on the contribution data in the data storage unit 24.

As described above, the contribution rate data is calculated using the deviation amount ΔZ.
The estimated output hot water temperature Tkaso deviates from the actually measured output hot water temperature Tout beyond an allowable range by providing a learning function of automatically correcting the output hot water temperature Tout due to a change in the contribution rate in accordance with an environmental change or the like. In this case, the contribution rate data can be automatically corrected according to the deviation amount ΔZ, so that the estimated outlet-side hot water temperature Tkaso based on the corrected contribution-rate data matches the actually measured outlet-side hot water temperature Tout. Is corrected in the direction in which the hot water temperature on the outlet side is almost equal to the actually measured hot water temperature on the outlet side, and the estimated outlet hot water temperature Tkaso deviates from the actual outlet hot water temperature. Is prevented from continuing for a long time, and the problem that the temperature of the tap water is stabilized at a temperature deviating from the hot water supply set temperature Tsp as described above can be reliably avoided.

The contribution data is corrected only when the deviation ΔZ of the estimated outlet water temperature Tkaso from the actually measured outlet water temperature Tout exceeds the allowable range ΔS in advance. Is corrected only when it is determined that the temperature has clearly changed. For example, regardless of the contribution ratio, the signal for transmitting the information of the actually measured outlet hot water temperature Tout and the estimated outlet hot water temperature Tkaso is transmitted. When the estimated outlet hot water temperature Tkaso shifts due to the influence of noise or the like, the shift amount is small. In such a case, the contribution ratio data is not corrected, and the contribution ratio data is corrected wastefully. Problems can be prevented.

In the first embodiment, the control of the combustion calorie control unit 26 is based on the outlet hot water temperature Tkaso estimated and detected by the heat exchanger outlet hot water temperature estimation and detection unit 22. Any configuration that can perform calorific value control may be used.
It is not limited to the above control configuration. For example, instead of performing the combustion heat amount control by switching between the combustion heat amount control based on the actually measured outlet water temperature Tout and the combustion heat amount control based on the estimated outlet water temperature Tkaso as described above, the estimated outlet water temperature T
The combustion heat amount may be controlled only by the combustion heat amount control based on kaso. Also in this case, since the hot water temperature almost coincident with the actual hot water temperature on the outlet side can be estimated and detected, the hot water temperature deviates from the hot water supply set temperature Tsp and becomes stable. Is avoided.

Hereinafter, a second embodiment will be described. The combustion equipment of this embodiment has the same pipeline configuration as the water heater shown in the first embodiment, and the contribution data as shown by the solid line L in FIG. And a control configuration for automatically correcting by using the contribution rates respectively corresponding to the above. FIG. 4 is a block diagram showing a characteristic control configuration in the second embodiment. As shown in FIG. 4, the control device 13 shown in this embodiment includes a tapping water temperature monitoring unit 20, a shift amount detecting unit 21, a heat exchanger outlet hot water temperature estimation detecting unit 22, a correction command unit 23, and a data storage unit. 24, a contribution data correction unit 25, a combustion calorie control unit 26, a contribution detection unit 32, and a tilt detection unit 33
And is configured. In the description of this embodiment, the hot water temperature monitoring unit 20, the shift amount detecting unit 21, the heat exchanger outlet hot water temperature estimation detecting unit 22, and the combustion heat amount control unit 26
Is the same as that of the first embodiment, and the description thereof is omitted here.

The correction instructing section 23 sets the tap water temperature Tout to a predetermined time Δt (for example, 5 seconds) and a predetermined temperature range Δht (based on the information of the tap water temperature Tout monitored by the tap water temperature monitoring section 20). (For example, a width of 1 ° C.), and in a state where it is detected that the temperature of the hot water is stable, the deviation amount ΔZ detected by the deviation amount detecting unit 21 is equal to a predetermined allowable range ΔS ( When the temperature deviates from, for example, 0.5 ° C.), it is determined that the contribution data needs to be corrected, and a contribution data correction command is output to the contribution detection unit 32.

Upon receiving the contribution data correction command, the contribution detection unit 32 receives the combustion heat amount P from the combustion heat control unit 26.
1, the incoming water temperature Tin detected by the incoming water thermistor 5, the hot water temperature Tz 1 in the hot water supply heat exchanger 2 detected by the heat exchange thermistor 15, and the outgoing temperature measured by the hot water thermistor 6. Each of the hot water temperatures Tout is taken, and based on the taken temperature information, the following equation (2)
, The contribution rate K1 'is detected.

K1 ′ = (Tz1−Tin) / (Tout−Tin) (2)

The contribution rate detection section 32 stores the contribution rate K1 'detected as described above in the data storage section 24 in association with the combustion heat quantity P1. Further, the contribution rate detection unit 32 has a built-in counter (not shown), and when detecting the contribution rate K1 ', counts up the counter to set the counter to 1.

After detecting the contribution rate K1 ', that is, when the counter is 1, the contribution rate detection section 32 fetches the combustion heat quantity information from the combustion heat quantity control section 26 every moment, and the fetched combustion quantity information is obtained. The amount of heat is calculated as the above contribution ratio K
Compared to the combustion heat amount P1 at the time when 1 'was obtained, the correction command is issued when the tapping water temperature is stable and the deviation ΔZ of the estimated tapping water temperature Tkaso from the actually measured tapping water temperature Tout is out of the allowable range ΔS. In the state where the burner 1 is detected by the unit 23, it is determined that the burner 1 is burning with the amount of combustion heat that is taken away from the amount of combustion heat P1 by a predetermined range ΔP (for example, 30%) or more. In some cases, the contribution rate K2 'is obtained in the same manner as described above using the incoming water temperature Tin, the hot water temperature Tz1 in the heat exchanger, and the actually measured outlet hot water temperature Tout.

The contribution rate detector 32 calculates the contribution rate K
2 ′ and the amount of combustion heat P2 when the contribution rate K2 ′ is obtained are stored in the data storage unit 24 in association with each other, and a tilt detection command is issued to the tilt detection unit 33.

When the inclination detection unit 33 receives the inclination detection command, the contribution ratio K stored in the data storage unit 24 is obtained.
1 ′, K2 ′ and the amount of combustion heat P corresponding to their contribution rates
The slope M of the amount of change in the contribution rate to the amount of change in the amount of combustion heat is obtained by the calculation of the following equation (3) based on P1 and P2.

M = (K2′−K1 ′) / (P2−P1) (3)

The inclination detecting section 33 outputs information on the obtained inclination M to the contribution rate data correcting section 25. Upon receiving the slope M, the contribution rate data correction unit 25 sets the data storage unit 2
4 to 6, the contribution data of the linear function as shown by the solid line in FIG. 6 and the obtained contributions K 1 ′ and K 2 ′ are read out, and the inclination of the contribution data is corrected to the obtained inclination M, and the respective corresponding values are corrected. The contribution rates K1 and K2 of the contribution rate data of the combustion heat amounts P1 and P2 are used as the detected contribution rates K1 'and K1.
The data is moved in the direction that matches 2 ′ to automatically correct the contribution data, and the corrected contribution data, for example, as indicated by the dashed line in FIG.

As described above, the contribution rate data correction unit 25
When the correction of the contribution rate data is completed, the counter is cleared, and preparation is made for the correction of the next contribution rate data.

In the second embodiment, the characteristic contribution data correction configuration is configured as described above. Hereinafter, an example of the contribution data correction operation will be briefly described based on the flowchart of FIG. explain. First, step 101
Then, it is determined whether or not the water supply of the water supply passage 3 is turned on by the water amount sensor FS. If it is determined that the water supply of the water supply passage 3 is turned on, the burner 1 is burned in step 102. Is determined based on a flame rod current output from a flame rod electrode (not shown) for detecting a combustion flame, and when it is determined that the burner 1 is burning, hot water is supplied. In step 103, it is determined whether or not the hot water temperature Tout is within the predetermined temperature range Δht for the predetermined time Δt and the hot water temperature Tout is stable.

When it is determined that the hot water temperature Tout is stable, the estimated hot water temperature Tkaso on the hot water outlet side is determined by the heat exchanger hot water outlet temperature estimating detection unit 22 in step 104, and the hot water supply operation is performed in step 105. During this process, it is determined whether or not the corrected flag 1 indicating that the contribution ratio data has been corrected is set. If it is determined that the corrected flag 1 is not set, then in step 106, the actual measurement side hot water is determined. The deviation ΔZ of the estimated outlet water temperature Tkaso with respect to the temperature Tout is compared with a predetermined allowable range ΔS, and it is determined whether or not the deviation ΔZ is within the allowable range ΔS.

When it is determined that the deviation amount ΔZ is out of the allowable range ΔS, it is determined that the contribution ratio data stored in the data storage unit 24 needs to be corrected.
In step 107, it is determined whether or not the counter 1 indicates that the contribution rate K1 'used to correct the contribution rate data has been detected.

When it is determined that the counter is not 1, the contribution ratio K1 'is obtained by the contribution ratio detecting section 32 in step 108, and the obtained contribution ratio K1' is used as the contribution ratio K1 '.
The value of 1 'is stored in the data storage unit 24 in correspondence with the amount of combustion heat P1 at the time of finding, and the counter is counted up to 1 in step 109.

Thereafter, at step 110, the water amount sensor F
In S, it is determined whether or not the flow of water through the water supply passage 3 is detected. When the detection of the flow of water and the detection of the continuation of the hot water supply are detected, the operation from step 101 onward is repeated. The hot water temperature Tout is stable and the actual hot water temperature Tout is measured.
The deviation amount ΔZ of the estimated outlet water temperature Tkaso with respect to
The state of deviating from S continues, and the step 1
If it is determined in step 07 that the counter is 1, in step 111, information on the amount of combustion heat is fetched, and the fetched amount of combustion heat is compared with the amount of combustion heat P1 obtained when the contribution ratio K1 'is obtained. It is determined whether or not the amount of combustion heat is away from the amount of combustion heat P1 by a set range ΔP or more.

When it is determined that the captured heat of combustion does not deviate from the combustion heat P1 by the set range ΔP or more, the operations from step 110 are repeated to determine that the combustion heat is deviated from the combustion heat P1 by the set range ΔP or more. If so, at step 112, the contribution rate K
2 ′, and the detected contribution rate K2 ′ and the contribution rate K
The combustion heat amount P2 corresponding to 2 ′ is stored in the data storage unit 24.

Next, at step 113, based on the detected contribution rates K1 'and K2' and the combustion heat quantities P1 and P2 corresponding to the contribution rates, the gradient M of the change rate of the contribution rate with respect to the change quantity of the combustion heat quantity is determined. Is detected. And step 11
In step 4, the contribution rate data stored in the data storage unit 24 is read out, the inclination of the contribution rate data is corrected to the above-obtained inclination M, and the contribution rates of the contribution rate data corresponding to the combustion heat amounts P1 and P2, respectively. The correction of the contribution data is performed by moving K1 and K2 in a direction to match the detected contributions K1 ′ and K2 ′, and the corrected contribution data is overwritten on the contribution data of the data storage unit 24. Then, a corrected flag indicating that the contribution rate data has been corrected is set.

Thereafter, the operations from step 110 are repeated. As described above, after the corrected flag is set, the presence / absence of the corrected flag is determined by the operation of determining whether or not the corrected flag is set in step 105, so that during the hot water supply operation, the correction of the contribution rate data is not performed. Not done again.

If it is determined in step 110 that running water is off, it is determined that hot water supply has stopped.
In step 5, it is determined whether or not the corrected flag is set. When the corrected flag is set, the counter is cleared and the corrected flag is defeated to prepare for the correction of the next contribution rate data. When the corrected flag is not set, the correction of the contribution data is not performed during the hot water supply operation this time, or only the detection of the contribution data K1 ′ for correcting the contribution data is performed. It is determined that it is necessary to continue the correction of the contribution rate data at the time of the next hot water supply operation, and the counter prepares for the next hot water supply operation as it is.

According to this embodiment, the same effects as in the first embodiment can be obtained, and the contribution ratio data is corrected using the contribution ratios corresponding to the two different amounts of combustion heat. Therefore, the gradient of the contribution rate data, which is a linear function, can also be corrected, and the correction of the contribution rate data can be performed more accurately.

The present invention is not limited to the above embodiments, but may take various embodiments. For example, in each of the above-described embodiments, the heat exchange thermistor 15 is provided so as to detect the water flow temperature of the lower pipe 17 in the hot water supply heat exchanger 2, but detects the water flow temperature of the upper pipe 18. The heat exchange thermistor 15 may be provided in such a manner. In this case, the contribution K of the heat exchange thermistor 15 at the hot water temperature detection site decreases as the amount of combustion heat decreases, as indicated by the solid line N in FIG. Again, in this case,
In the same manner as in each of the above-described embodiments, the contribution rate data can be corrected. By performing the correction of the contribution rate data, the same effect as in each of the above-described embodiments can be obtained.

In the second embodiment, the hot water temperature Tout is stable, and the deviation ΔZ of the estimated hot water temperature Tkaso from the actually measured hot water temperature Tout is out of the predetermined allowable range ΔS. Is detected, the contribution rate detection unit 32 calculates the contribution rate K1 ′ to the combustion heat quantity P1 at that time, and thereafter, the burner 1 burns with the combustion heat quantity that is more than the set range ΔP away from the combustion heat quantity P1. The contribution rate K2 'was detected, the second combustion heat amount P1 and the second combustion heat amount ΔP separated from the combustion heat amount P1 by a predetermined combustion heat amount ΔP
Is determined in advance, and after determining that it is necessary to correct the contribution data in a state where the tap water temperature Tout is stable as described above, the contribution detection unit 32
The contribution rate K1 'when the burner 1 is burning with the first combustion heat quantity P1 is detected, and the second combustion heat quantity P1 is detected.
2, the contribution ratio K2 'when the burner combustion is performed may be detected. Also in this case, the correction of the contribution data is performed based on the detected contributions K1 'and K2' in the same manner as in the second embodiment. Further, as described above, when the amount of combustion heat when detecting the contribution rate for correcting the contribution rate data is determined in advance, the combustion heat amount set above may be variably set by a predetermined method.

In each of the above embodiments, the tap water temperature monitor 2
0 is the outlet temperature T measured by the tapping thermistor 6.
out was monitored, but the heat exchanger outlet hot water temperature estimation detection unit 2
The outlet hot water temperature Tkaso estimated and detected by step 2 may be monitored. In this case, the correction command unit 23 determines whether or not the hot water temperature is stable based on the estimated hot water temperature Tkaso.

Further, in the second embodiment, when the contribution ratio data is corrected, the inclination detecting section 33 uses the contribution ratios corresponding to the combustion heat amounts at two different points to calculate the inclination M.
And the obtained slope M is used as the contribution rate data correction unit 25.
However, for example, a plurality of contribution rates corresponding to two or more different amounts of combustion heat are obtained, and the slope M of the change rate of the contribution rate with respect to the change in combustion heat quantity is determined from the contribution rates by a predetermined method. May be obtained.

Further, when the estimated outlet water temperature Tkaso deviates from the actually measured outlet water temperature Tout, the combustion heat amount P at that time is shifted.
, The incoming water temperature Tin, and the detected hot water temperature T of the heat exchange thermistor 15
z1 and the measured hot water temperature Tout of the tapping thermistor 6 are taken in, the contribution rate K 'is calculated as described above, and the contribution rate of the contribution rate data corresponding to the combustion heat amount P when the contribution rate K' is calculated. May shift the contribution ratio data in a direction that matches the calculated contribution ratio K ′ to correct the contribution ratio data.

Further, in each of the above embodiments, the contribution rate data is given by the graph data.
It may be given in the form of arithmetic expression data for calculating the contribution rate according to the magnitude of the combustion heat. In this case, for example,
When the contribution rate is represented by K, the amount of combustion heat is represented by P, the gradient of the variation of the contribution rate with respect to the variation of the combustion heat quantity is represented by m, and the coefficient is represented by a, the contribution rate data is expressed by the following equation (4). It is represented as shown.

K = m × P + n (4)

When the contribution rate data is given by an arithmetic expression, the shift amount obtained as shown in the first embodiment is added to the coefficient n of the above equation (4) and changed. Thus, the contribution ratio data can be corrected in the same manner as in the first embodiment. Further, the gradient m is corrected to the gradient M detected in the same manner as in the second embodiment, and the detected contribution rate K1 ′ or K2 ′, the corresponding combustion heat amount P1 or P2, and the detected The corrected coefficient n ′ is obtained by the calculation of the following equation (5) using the calculated slope M, and the coefficient n is corrected to the corrected coefficient n ′, that is, the contribution rate data is moved. By doing so, the contribution ratio data can be corrected in the same manner as in the second embodiment.

N = K1'-M.times.P1 (5)

Further, in the above embodiment, the water heater shown in FIG. 10 has been described as an example. However, a heat exchanger for producing hot water, a burner for burning and heating the heat exchanger, and an incoming water temperature detecting means are provided. The present invention is applicable to any combustion equipment having a hot water supply function having a control structure capable of controlling burner combustion heat quantity based on the hot water temperature on the outlet side of the heat exchanger estimated and detected using the contribution rate data. Can be applied. For example, a hot water supply passage connecting the hot water supply passage 4 and the bath tub is provided, and a hot water supply function for pouring hot water produced by the hot water supply heat exchanger 2 into the bath tub through the hot water supply passage and a hot water supply function are provided. The present invention can be applied to a combustion device or a combustion device having a bath reheating function in addition to the above hot water supply function.

[0089]

According to the present invention, the hot water temperature at the outlet of the heat exchanger, which is estimated and detected by the heat exchanger outlet hot water temperature estimating and detecting means using the contribution ratio data, is measured at the outlet of the heat exchanger. A contribution rate data correction unit that automatically corrects the contribution rate data when the temperature deviates from the hot water temperature on the side is automatically corrected. As a result, the estimated hot water temperature at the outlet can be corrected in a direction to match the actually measured hot water temperature at the outlet. Hot water temperature can be estimated and detected.

As described above, the outlet hot water temperature can be accurately estimated and detected without being affected by environmental changes or the like. Therefore, the hot water outlet is controlled by the combustion heat amount control based on the estimated hot water temperature on the outlet side. Hot water temperature can be accurately controlled to the hot water supply set temperature.

In the correction of the contribution ratio data using the contribution ratios corresponding to the two different amounts of combustion heat, the inclination of the contribution ratio data can be corrected, and the contribution ratio data can be corrected more accurately. Can be corrected.

The correction of the contribution rate data is performed only when the deviation amount of the estimated and detected outlet water temperature from the actually measured outlet water temperature is out of a predetermined allowable range. For example, as in the case where the estimated outlet hot water temperature has deviated from the actually measured outlet hot water temperature regardless of the change in the contribution rate, the estimated outlet hot water temperature relative to the actually measured outlet hot water temperature is different. The correction of the contribution data is not performed when the deviation of the hot water temperature is small, and the correction of the contribution data can be performed only when it is estimated that the correction of the contribution data is necessary due to an environmental change or the like. It is possible to eliminate the waste that the contribution rate data is corrected when the estimated outlet hot water temperature is shifted regardless of the rate data.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a characteristic control configuration in the first embodiment.

FIG. 2 shows an example of contribution rate data in the case where a heat exchange thermistor is provided so as to detect a water flow temperature in a lower pipe of a hot water supply heat exchanger, and correction of the contribution rate data shown in the first embodiment. 6 is a graph showing an example of contribution rate data corrected by the following.

FIG. 3 is a graph showing a stable state of tap water temperature.

FIG. 4 is a block diagram showing a characteristic control configuration in the second embodiment.

FIG. 5 is a flowchart illustrating an example of a characteristic contribution rate data correction operation in the second embodiment.

FIG. 6 is a graph showing an example of the contribution data and an example of the contribution data corrected by the contribution data correction operation shown in the second embodiment.

FIG. 7 is a graph showing an example of contribution rate data at a hot water temperature detecting portion of the heat exchange thermistor when a heat exchange thermistor is provided so as to detect a water flow temperature in an upper pipeline of the hot water supply heat exchanger.

FIG. 8 is a block diagram illustrating an example of a combustion heat amount control configuration using an estimated and detected outlet-side hot water temperature Tkaso.

FIG. 9 is a graph showing an example of hot water temperature fluctuation.

FIG. 10 is a model diagram showing an example of a combustion apparatus to which the present invention can be applied.

FIG. 11 is a model diagram showing a structural example of a hot water supply heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner 2 Hot water supply heat exchanger 3 Water supply passage 5 Inlet thermistor 6 Outlet thermistor 15 Heat exchange thermistor 22 Heat exchanger outlet side hot water temperature estimation detection unit 25 Contribution data correction unit 32 Contribution detection unit 33 Slope detection unit

Claims (4)

[Claims] 1. A heat exchanger for heating water supplied from a water supply passage to produce hot water and discharge the hot water, a burner for burning and heating the heat exchanger, and a temperature of incoming water supplied to the heat exchanger. Water temperature detection means for detecting the temperature of the hot water flowing out of the heat exchanger, and the hot water temperature detecting means for detecting the hot water temperature in the heat exchanger. The hot water is supplied from the inlet of the heat exchanger to the hot water temperature detecting portion of the heat exchanger hot water detecting means with respect to the amount of heat absorbed by the hot water from the inlet side to the outlet side of the heat exchanger. The contribution rate, which is the ratio of the amount of heat absorbed, is given by contribution rate data corresponding to the magnitude of the combustion heat quantity of the burner, and the contribution rate obtained based on the contribution rate data according to the combustion heat quantity and the heat exchanger hot water. The hot water temperature detected by the temperature detection means and the incoming water temperature detection means A heat exchanger outlet hot water temperature estimation and detection unit for estimating and detecting the outlet water temperature of the heat exchanger based on the output water temperature, A combustion device capable of controlling the amount of combustion heat of a burner based on the outlet hot water temperature, wherein the heat exchanger outlet hot water estimating and detecting unit detects the outlet hot water temperature actually measured by the outlet hot water detecting means. A combustion device comprising: a contribution rate data correction unit that corrects the contribution rate data based on a deviation amount of the outlet-side hot water temperature estimated and detected by the method. 2. A heat exchanger for heating water supplied from a water supply passage to produce hot water and discharge the hot water, a burner for burning and heating the heat exchanger, and a temperature of incoming water supplied to the heat exchanger. Water temperature detection means for detecting the temperature of the hot water flowing out of the heat exchanger, and the hot water temperature detecting means for detecting the hot water temperature in the heat exchanger. The hot water is supplied from the inlet of the heat exchanger to the hot water temperature detecting portion of the heat exchanger hot water detecting means with respect to the amount of heat absorbed by the hot water from the inlet side to the outlet side of the heat exchanger. The contribution ratio, which is the ratio of the amount of heat absorbed, is given by contribution ratio data corresponding to the amount of combustion heat of the burner, and the contribution ratio determined based on the contribution data according to the amount of combustion heat and the heat exchanger hot water. The hot water temperature detected by the temperature detecting means and the incoming water temperature A heat exchanger outlet hot water temperature estimating and detecting section for estimating and detecting the outlet hot water temperature based on the outgoing incoming water temperature and being estimated and detected by the heat exchanger outlet hot water temperature estimating detecting means. A burner capable of controlling the amount of combustion heat of the burner based on the outlet hot water temperature, wherein the outlet hot water temperature actually measured by the outlet hot water detecting means and the heat exchanger hot water temperature during burner combustion. Based on the hot water temperature detected by the detecting means and the incoming water temperature detected by the incoming water temperature detecting means, when the contribution rate data correction command is issued, the contribution rate is obtained,
Thereafter, when the burner is burning with a combustion heat amount that is more than a predetermined set range from the combustion heat amount of the burner when the contribution ratio was obtained, a contribution ratio detection unit that obtains the contribution ratio again; Based on each contribution rate determined by the contribution rate detection unit and the amount of combustion heat when the contribution rates are determined,
A gradient detector for calculating the gradient of the variation of the contribution rate with respect to the variation of the amount of combustion heat; and correcting the gradient of the contribution ratio data to the gradient determined by the gradient detector, and corresponding to the respective contribution ratio data of the combustion heat. And a contribution data correction unit that corrects the contribution data by moving the contribution ratio in a direction coinciding with each of the calculated contribution ratios. 3. A heat exchanger for heating water supplied from a water supply passage to produce hot water and discharge the hot water, a burner for burning and heating the heat exchanger, and a temperature of incoming water supplied to the heat exchanger. Water temperature detection means for detecting the temperature of the hot water flowing out of the heat exchanger, and the hot water temperature detecting means for detecting the hot water temperature in the heat exchanger. The hot water is supplied from the inlet of the heat exchanger to the hot water temperature detecting portion of the heat exchanger hot water detecting means with respect to the amount of heat absorbed by the hot water from the inlet side to the outlet side of the heat exchanger. The contribution rate, which is the ratio of the amount of heat absorbed, is given by contribution rate data corresponding to the magnitude of the combustion heat quantity of the burner, and the contribution rate obtained based on the contribution rate data according to the combustion heat quantity and the heat exchanger hot water. The hot water temperature detected by the temperature detection means and the incoming water temperature detection means A heat exchanger outlet hot water temperature estimation and detection unit for estimating and detecting the outlet water temperature of the heat exchanger based on the output water temperature, A combustion device capable of controlling the calorific value of the burner based on the outlet hot water temperature, wherein the hot water temperature detected by the heat exchanger hot water temperature detecting means and the outlet hot water temperature detected by the outlet hot water temperature detecting means. Based on the hot water temperature and the incoming water temperature detected by the incoming water temperature detecting means, the contribution rate is determined when the burner is burning at a predetermined set combustion heat quantity, and thereafter, A contribution rate detection unit that obtains a contribution rate when burner combustion is performed with a combustion heat quantity separated by a predetermined combustion heat quantity; each contribution rate obtained by the contribution rate detection unit, and when the contribution rates are obtained. Based on the amount of combustion heat A slope detector for calculating the slope of the rate of change, and correcting the slope of the contribution rate data to the slope determined by the slope detector, and determining the contribution rates of the respective contribution rates of the combustion heat amounts. And a contribution data correction unit that corrects the contribution data by moving in a direction corresponding to each contribution. 4. A contribution rate data correction unit for estimating the outlet-side hot water temperature with respect to the outlet-side hot water temperature actually measured by the outlet-side hot water temperature detecting means during a period in which the hot water temperature flowing out of the heat exchanger is stable. The correction of the contribution rate data is performed only when the deviation amount of the outlet hot water temperature estimated and detected by the detection unit is out of a predetermined allowable range.
Or the combustion apparatus according to claim 3.