JPH0814556A - Incomplete combustion detector for combustion device - Google Patents

Abstract

PURPOSE:To improve the correcting accuracy of an outputted value by a method wherein the degree of deterioration is detected by an accumulated value, obtained by accumulating the values corresponding to a condition that unburnt constituents are generated, upon discriminating incomplete combustion condition based on a corrected outputted value obtained by correcting the output value of an unburnt constituent sensor based on the output of a deteriorated degree detecting means. CONSTITUTION:A contact combustion type unburnt constituent sensor S, outputting a signal in accordance with the concentration of unburnt constituent contained in the exhaust gas, is provided in a combustion instrument provided with a ventilating means 14 ventilating combustion air to a burner 2 while the detecting signal is inputted into a control unit H. The deteriorated condition detecting means 102 of the control unit H, detects an accumulated value, obtained by accumulating values corresponding to a condition that the unburnt constituent is generated, as the degree of deterioration of the unburnt constituent sensor S. Subsequently, the output value of the unburnt constituent sensor S is corrected by a correcting means 105 based on the detected degree of deterioration of detection and incomplete combustion condition is judged by an incomplete combustion judging means 106 based on the output value of the sensor after correction to stop the combustion of the burner 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner and a burner equipped with a ventilating means for ventilating combustion air to the burner and discharging the combustion gas from the burner. And a deterioration degree for detecting the degree of deterioration of the unburned component sensor of the contact combustion type, which is provided in a state where the unburned component sensor outputs an output value according to the concentration of the unburned component contained in the combustion gas. A detection means, a correction means for correcting the output value of the unburned component sensor based on the detected deterioration degree detected by the deterioration degree detection means, and an incomplete combustion state based on the corrected output value corrected by the correction means. The present invention relates to an incomplete combustion detection device for a combustion device provided with incomplete combustion determination means for determining.

[0002]

2. Description of the Related Art CO gas is known as an unburned component in burner combustion gas, and a CO sensor that outputs an output value according to the concentration of CO gas is known as an unburned component sensor. There is. It is known that in such an incomplete combustion detection device for a combustion device, the unburned component sensor deteriorates with time, but the output value and the sensitivity tend to decrease as the degree of deterioration increases. Therefore, conventionally, the degree of decrease in the output value reflects the degree of deterioration, and the output value is corrected based on the degree of decrease in the output value. That is, the output value when the unburned component is zero is stored in advance as an output reference value in the initial stage where the unburned component sensor is not deteriorated, and the unburned component can be in a state of zero during the operation of the device. The deterioration degree detecting means is configured to calculate the deviation between the output value and the output reference value and detect the calculated deviation as the deterioration degree indicating the degree of deterioration. Further, the correction means is configured to correct the output value of the unburned component sensor based on the calculated deviation calculated by the deterioration degree detection means. For example, the output value of the unburned component sensor is corrected by correcting the sensitivity of the unburned component sensor based on the calculated deviation. That is, the sensitivity is corrected to be smaller, assuming that the sensitivity decreases as the calculation deviation increases.

[0003]

By the way, when the uncombusted component sensor is deteriorated and a physical force such as vibration or shock is applied, the sensitivity hardly changes and only the output value is obtained. It is known to change. Therefore, the degree of decrease in output value does not accurately reflect the degree of deterioration, and there is a certain correlation between the degree of change in output value and the degree of change in sensitivity. I can not say. Therefore, conventionally, there have been the following problems due to the correction of the output value based on the degree of decrease of the output value. That is, since the output value is corrected based on the degree of decrease in the output value that does not accurately reflect the degree of deterioration, the accuracy of the output value correction is naturally poor.
Therefore, for safety, in order to reliably prevent a situation in which the combustion of the burner is not stopped (hereinafter abbreviated as “late delay”) even though the incomplete combustion state is reached, it is not determined that the incomplete combustion state is reached. Since the correction amount for correcting the output value was set to a fairly large value, the combustion of the burner is stopped because it is judged to be an incomplete combustion state even though the incomplete combustion state has not been reached Abbreviated) is likely to occur and the usability for the user is deteriorated.

For example, as described above, when the output value is corrected by correcting the sensitivity based on the calculated deviation,
When a physical force is applied and the output value changes to the increasing side, the calculated deviation becomes smaller, so the corrected sensitivity becomes larger than the actual sensitivity according to the degree of deterioration, and conversely,
When the output value changes to the lower side, the calculated deviation increases, so the corrected sensitivity becomes smaller than the actual sensitivity according to the degree of deterioration. Therefore, when the corrected sensitivity is higher than the actual sensitivity, there is a possibility that a delay will occur. On the contrary, when the corrected sensitivity is lower than the actual sensitivity, premature disconnection may occur. If a late delay occurs, it will cause a safety problem.Therefore, in order to reliably prevent the occurrence of a late delay, the sensitivity correction amount based on the calculated deviation has been set to a fairly large value (that is, corrected The sensitivity was much smaller than it was actually), so premature disconnection was more likely to occur and the usability for the user was reduced.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the correction accuracy of an output value,
It is to solve the problem of usability such as premature disconnection.

[0006]

A first characteristic configuration of an incomplete combustion detecting device for a combustion device according to the present invention is characterized in that the deterioration degree detecting means integrates a value corresponding to a state in which an unburned component is generated. The value is configured to be detected as the degree of deterioration.

The second characteristic configuration is that the value corresponding to the state in which the unburnt component is generated is the burn time of the burner.

The third characteristic structure is that the value corresponding to the state in which the unburned component is generated is the combustion heat quantity of the burner.

A fourth characteristic configuration is that the value corresponding to the state in which the unburned component is generated is the number of ignitions or extinguishments of the burner.

In a fifth characteristic configuration, the deterioration degree detecting means performs weighting according to the combustion heat quantity of the burner,
It is configured to integrate the values corresponding to the state in which the unburned component is generated.

A sixth characteristic configuration is such that the correction means corrects the output value of the unburned component sensor by correcting the sensitivity of the unburned component sensor based on the detected deterioration degree. There is a point.

According to a seventh characteristic configuration, the correction means corrects an added value to be added to the output value of the unburned component sensor based on the detected deterioration degree, whereby the output value of the unburned component sensor is corrected. Is configured to correct.

An eighth characteristic configuration is such that the correction means changes the correction amount for correcting the output value of the unburned component sensor when the detected deterioration degree reaches a set value. In point.

A ninth characteristic configuration is such that the deterioration degree detecting means detects the integrated combustion time obtained by integrating the combustion time of the burner and the integrated combustion heat quantity obtained by integrating the combustion heat quantity of the burner as the deterioration degree. The correction means is configured to correct the output value of the unburned component sensor based on the integrated combustion heat quantity, and one of the integrated combustion time and the integrated combustion heat quantity The point is that the correction amount for correcting the output value of the unburned component sensor is changed when the set value set for each of them is reached.

[0015]

The operation of the first characteristic configuration is as follows. The deterioration of the unburned component sensor is due to catalyst poisoning due to the adhesion of combustion products (sulfur, sulfur oxides (SOx), etc.) in the combustion gas. That is, the greater the amount of combustion products attached, the greater the degree of deterioration. Therefore, the integrated value obtained by integrating the values corresponding to the state in which the burner is burning and the combustion gas is generated, that is, the state in which the unburned components are generated, accurately reflects the degree of deterioration. The present invention is made based on this point of view, and accurately detects the degree of deterioration, detects the integrated value obtained by integrating the values corresponding to the state in which unburned components occur, and detects the integrated value as the degree of deterioration. Since the output value is corrected based on the value, the correction accuracy of the output value is improved.

The operation of the second characteristic structure is as follows. As a value corresponding to the state where unburned components occur,
There is a burner burning time. Therefore, the integrated combustion time obtained by integrating the burner combustion times is detected as the degree of deterioration, and the output value is corrected based on the integrated combustion time, so the accuracy of the output value correction is improved.

The operation of the third characteristic configuration is as follows. The unburned component sensor also deteriorates due to thermal fatigue,
That is, the greater the integrated heat amount that is exposed, the greater the degree of deterioration. That is, the degree of deterioration of the unburned component sensor depends on both the amount of combustion products attached and the amount of heat exposed. Therefore, the integrated combustion heat quantity obtained by integrating the burner combustion heat quantity evaluates the degree of deterioration in consideration of both the adhesion amount of the combustion products and the exposed integrated heat quantity. Will more accurately reflect the degree of. Therefore, since the integrated combustion heat quantity is detected as the degree of deterioration and the output value is corrected based on the integrated combustion heat quantity, the correction accuracy of the output value is further improved.

The operation of the fourth characteristic structure is as follows. The number of times the burner is ignited and the number of times the burner is extinguished are also values corresponding to the state in which unburned components are generated. Further, the more frequently the burner is ignited and extinguished, the more frequent the heating and cooling of the unburned component sensor is, so the degree of deterioration becomes greater. Therefore, the integrated number of ignitions obtained by integrating the number of ignitions of the burner or the integrated number of extinguishings obtained by integrating the number of extinctions more accurately reflects the degree of deterioration. Therefore, since the cumulative number of ignitions or the cumulative number of extinctions is detected as the degree of deterioration and the output value is corrected based on the cumulative number of ignitions or the cumulative number of extinctions, the correction accuracy of the output value is further improved.

The operation of the fifth characteristic configuration is as follows. The unburned component sensor also deteriorates due to thermal fatigue,
The degree of deterioration increases as the atmospheric temperature increases. That is, when the combustion heat amount of the burner is large, the ambient temperature of the unburned component sensor is higher than when it is small, and therefore the degree of deterioration is greater. Therefore, the weighted integrated value obtained by performing weighting according to the combustion heat quantity of the burner and integrating the values corresponding to the state in which the unburned component is generated will more accurately reflect the degree of deterioration. Therefore, since the weighted integrated value is detected as the degree of deterioration and the output value is corrected based on the weighted integrated value, the correction accuracy of the output value is further improved.

The operation of the sixth characteristic structure is as follows. The sensitivity changes according to the degree of deterioration. Therefore, if the output value is corrected by correcting the sensitivity according to the degree of deterioration, the correction accuracy of the output value can be improved. According to the sixth characteristic configuration, the sensitivity is corrected based on the integrated value obtained by integrating the values corresponding to the state in which the unburned component is generated, so the sensitivity is corrected in a state in which the degree of deterioration is accurately reflected. Therefore, the correction accuracy of the output value is further improved.

The operation of the seventh characteristic structure is as follows. The output value is corrected by correcting the added value to be added to the output value to be larger as the integrated value obtained by integrating the values corresponding to the state where the unburned component is generated becomes larger.

The operation of the eighth characteristic structure is as follows. When the usage time of the combustion equipment becomes long, not only the deterioration of the unburned component sensor but also the deterioration of the combustion equipment itself becomes a problem. In other words, the longer the combustion equipment is used,
Since the burner deteriorates and dust adheres to the ventilation means, the combustion air supply path, and the combustion gas exhaust path, an incomplete combustion state easily occurs. Further, the longer the operating time of the combustion equipment, the greater the variation in the degree of deterioration of the unburned component sensor. In other words, the longer the operating time of the combustion device, the more likely it is that a late cut will occur. The longer the integrated combustion time, the larger the integrated combustion heat quantity, and the larger the integrated number of ignitions or the integrated number of fires, the longer the operating time of the combustion device. Therefore, when the integrated value obtained by integrating the values corresponding to the state where the unburned component is generated reaches the set value, by changing the correction amount for correcting the output value,
It surely prevents the occurrence of late disconnection due to the long usage time of the combustion equipment.

The operation of the ninth characteristic configuration is as follows. Since the integrated combustion heat quantity more accurately reflects the degree of deterioration, correcting the output value based on the integrated combustion heat quantity is advantageous in terms of improving the correction accuracy of the output value. However, when the burner is used in a state where the combustion heat amount is small, the integrated combustion time becomes long even though the integrated combustion heat amount is not so large. In such a case, there is a problem of occurrence of delayed cutoff due to a long use time of the combustion device. Therefore, by changing the correction amount for correcting the output value when the integrated combustion time reaches the set value set for it before the integrated combustion heat amount reaches the set value set for it, It surely prevents the occurrence of late disconnection due to the long usage time of the combustion equipment.

[0024]

According to the first and second characteristic configurations, the correction accuracy of the output value is improved, so that the correction amount for correcting the output value is unnecessary as in the conventional case in order to prevent the delay. Since it is no longer necessary to increase the size, it is possible to suppress the occurrence of premature disconnection due to an unnecessarily large correction amount, and it is possible to improve usability.

According to the third and fourth characteristic constitutions, the correction accuracy of the output value is further improved as compared with the case of the first and second characteristic constitutions, so that the correction amount is unnecessarily increased. It has become possible to further suppress the occurrence of premature disconnection, and it is possible to further improve usability.

According to the fifth characteristic constitution, the correction accuracy of the output value is further improved as compared with the case of the third and fourth characteristic constitutions, so that the correction amount is increased unnecessarily quickly. It has become possible to further suppress the occurrence of breaks and improve usability.

According to the sixth characteristic configuration, the correction accuracy of the output value is further improved, so that it is possible to further suppress the occurrence of premature disconnection due to an unnecessarily large correction amount. It has become possible to further improve usability.

According to the seventh characteristic construction, a simple control construction in which the added value to be added to the output value is simply corrected based on the integrated value obtained by integrating the values corresponding to the state in which the unburned component is generated Since the output value can be corrected by, the cost of the device can be reduced.

According to the eighth characteristic configuration, it is possible to further improve safety while improving usability.

According to the ninth characteristic configuration, it is possible to further improve the safety while further improving the usability as compared with the case of the eighth characteristic configuration.

[0031]

【Example】

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a hot water supply device as an example of a combustion device including an incomplete combustion detection device of the present invention includes a water heater Y, a controller H that controls the operation of the water heater Y, and a remote controller R. It consists of The water heater Y is connected to the combustion chamber 1, the burner 2 provided inside the combustion chamber 1, the heat exchanger 3 for water heating, and the upper part of the combustion chamber 1, and the combustion gas of the burner 2 is exposed to the outside. To the exhaust passage 5, the combustion air to the burner 2, and the ventilation gas to exhaust the combustion gas of the burner 2 to the outside through the exhaust passage 5, and to the heat exchanger 3 for heating. Water supply passage 6 for supplying the above water, a hot water supply passage 7 for supplying hot water heated in the heat exchanger 3 to a hot water tap (not shown), and a fuel supply passage for supplying fuel (gas) to the burner 2. 8 and.

In the water supply passage 6, the amount of water supplied to the heat exchanger 3 Qi
The water supply amount sensor 9 for detecting the
Hot water temperature sensor 1 for detecting the hot water temperature Tx for the hot water tap
0 is provided. The fuel supply passage 8 is connected to a gas supply pipe for general households, and the burner 2 is connected to the fuel supply passage 8.
An electromagnetic proportional valve 11 that adjusts the fuel supply amount Ip to the burner 2 according to the combustion heat amount q of the above, and an interrupt valve 12 that interrupts the fuel supply are provided.

The remote controller R is connected to the control unit H by wire or wirelessly, and has an operation switch 13 for instructing the operation and stop of the hot water supply device, a temperature setting switch 14 for setting a set target hot water supply temperature Ts, and various information. Show LE
D lamps 15, 16, 17, 18 and the like are provided. The LED lamp 15 indicates whether or not the hot water supply device is operating, and the LED lamps 16, 17, and 18 indicate
It is configured to display an abnormal state as described later.

A CO sensor S as an example of an unburned component sensor is provided in the exhaust passage 5 in a state of being in contact with the combustion gas of the burner 2. The CO sensor S is configured to output an output value according to the concentration of CO as an unburned component contained in the combustion gas.

FIG. 2 shows the structure of the CO sensor S. The CO sensor S is a protective frame 2 made of stainless steel.
1, the sensor element 23, the temperature compensating reference element 24, and the ambient temperature A of the CO sensor S on the pedestal 22 inside
It is equipped with a temperature sensor 25 for detecting. The sensor element 23 and the temperature compensating reference element 24 are each composed of a platinum wire carrying a catalyst.
3, the temperature compensating reference element 24, and the resistance elements 26 and 27 are connected in a bridge circuit state as shown in FIG. Then, the sensor element 23 and the temperature compensating reference element 24 have about 20
The unburned components that are heated to 0 ° C and come into contact with the surface thereof are burned by the catalytic action. At this time, since the catalyst carried by the sensor element 23 has selectivity for CO, a difference occurs in the element temperature between the sensor element 23 and the temperature compensating reference element 24. Since the resistance of platinum wire changes with temperature, the higher the CO concentration in the combustion gas,
The difference between the resistance values of the sensor element 23 and the temperature compensation reference element 24 becomes large. Therefore, the output value Vs according to the CO concentration in the combustion gas is determined by the connection portion between the sensor element 23 and the temperature compensating reference element 24 in the bridge circuit,
Also, it is configured to be output from the connecting portion between the resistance elements 26 and 27. In addition, 28 in FIG. 2 is a connector part with the lead wire connected to the control part H.

The output value Vs of the CO sensor S has a temperature characteristic that it changes according to the ambient temperature A even if the CO concentration is the same. In the following description, the CO concentration will be described as CO concentration D. FIG. 4 shows the CO concentration D
Shows the temperature characteristic of the output value Vs in the state of zero, and the solid line L1 in FIG. 4 indicates the output value Vs in the state of zero CO concentration D when the CO sensor S is not deteriorated (initial stage). Shows the temperature characteristics of. Also, CO concentration D
The output value Vs of the CO sensor S increases in a state in which the solid line L1 is translated in a direction in which the output value increases as the value increases. In FIG. 4, the ambient temperature A is 70 to 200 °.
The range of C is a region where the burner 2 is burning,
The range of 70 ° C. or lower is a region where the combustion of the burner 2 is almost stopped.

When the ambient temperature A is fixed at a predetermined temperature, the CO concentration D and the output value Vs have a correlation as shown in the following equation (1). Vs = αD + β (1) where α is the sensitivity of the CO sensor S, and β is the output value Vs when the CO concentration D is zero when the ambient temperature A is a predetermined temperature. In the initial stage where the CO sensor S is not deteriorated, α = αc and β = Vcc are set, respectively. Here, αc is the sensitivity of the CO sensor S when the CO sensor S is not deteriorated, and Vcc is the CO concentration D when the atmosphere temperature A is 150 ° C. when the CO sensor S is not deteriorated. Is the output value Vs in the state. FIG. 5 shows the correlation between the CO concentration D and the output value Vs, and the solid line M1 in FIG. 5 shows the correlation when the CO sensor S is not deteriorated (initial stage).

In FIG. 4, when the CO sensor S deteriorates, as shown by the broken line L2 and the alternate long and short dash line L3, the CO concentration D
The output value Vs in the state where is zero shows a tendency to decrease when the solid line L1 is translated in the direction in which the output value becomes smaller. Then, after the CO sensor S has deteriorated (shown by a broken line L2 and a one-dot chain line L3) and at an initial stage (shown by a solid line L1).
When the deviation of the output value Vs when the CO concentration D is zero between and is ΔV, the deviation ΔV tends to increase as the degree of deterioration of the CO sensor S increases. or,
The sensitivity α of the CO sensor S tends to decrease as the degree of deterioration increases.

As shown by a broken line L2 in FIG. 4, when the output value Vs in the state where the CO concentration D is zero decreases, the correlation between the CO concentration D and the output value Vs shows a broken line in FIG. As shown by M2, similarly, FIG.
When the output value Vs in the state where the CO concentration D is zero is decreased as indicated by the alternate long and short dash line L3 in the figure, the correlation between the CO concentration D and the output value Vs is as indicated by the alternate long and short dash line M3 in FIG. Become. Sensitivity α is a solid line M1 and a broken line M
2, it becomes smaller in the order of the one-dot chain line M3. Also, CO sensor S
When a physical force such as vibration or shock is applied to the
May hardly change and only the output value Vs may change. For example, when a physical force is applied while the CO sensor S has deteriorated to the state where the correlation between the CO concentration D and the output value Vs is shown by the broken line M2, only the output value Vs changes and CO The correlation between the density D and the output value Vs is a state in which the broken line M2 is translated in the direction in which the output value increases or decreases.

The control section H includes a combustion control means 101 for controlling the combustion operation of the water heater Y, a deterioration degree detection means 102 for detecting the deterioration degree of the CO sensor S, and a storage means 103 for storing various data. , The CO concentration D is zero, based on the deviation calculation means 104 for calculating the deviation ΔV of the output value Vs between the CO sensor S after deterioration and the initial value, and the detected deterioration degree detected by the deterioration degree detecting means 102. C
Correction means 105 for correcting the output value Vs of the O sensor S,
Based on the corrected output value corrected by the correction unit 105, the operations of the incomplete combustion determination unit 106 for determining the incomplete combustion state and the operation of the incomplete combustion determination unit 106 are restrained for a set time after the start of combustion of the burner 2. A time restraint means 107 is provided. The storage unit 103 is configured by a non-volatile memory (E ² PROM) or the like that retains the stored contents even when the power supply to the control unit H is stopped due to a power failure or the like.

The control unit H includes a remote control device R, a fan 4, a water supply amount sensor 9, a hot water supply temperature sensor 10, and a solenoid proportional valve 1.
1, the on / off valve 12, the CO sensor S, and the temperature sensor 25 are connected.

When the water supply amount Qi adjusted by the hot water tap and detected by the water supply amount sensor 9 reaches the set water amount, the combustion control means 101 executes the hot water supply operation described below, and when the water supply amount Qi becomes less than the set water amount, Stop hot water supply operation. In the hot water supply operation, basically, the proportional solenoid valve 11 is adjusted by adjusting the electromagnetic proportional valve 11 according to the combustion heat quantity q set so that the hot water supply temperature Tx detected by the hot water supply temperature sensor 10 becomes the set target hot water supply temperature Ts. While adjusting the fuel supply amount Ip, the rotation speed of the fan 4 is controlled so that the rotation speed of the fan 4 becomes a target rotation speed that is set in advance for the fuel supply amount Ip. In the following description, the basic control in this hot water supply operation is called proportional control. Also, the combustion control means 101
Performs an after-purging in which the operation of the fan 4 is continued for a set time (for example, about 1 minute) even after the combustion of the burner 2 is stopped.

The storage means 103 stores the output reference value Vc of the CO sensor S when the CO concentration D is zero in association with the ambient temperature A of the CO sensor S. For example, the output value Vs having a correlation with the ambient temperature A as shown by the solid line L1 in FIG. 4 is stored as the output reference value Vc. Further, the storage means 103 stores αc and Vc
Remember c.

The deviation calculating means 104, after the after-purge, has passed the set time (for example, 30 minutes), the unburned component is zero, and the output value Vs of the CO sensor S is stable. Of the output value Vs and the temperature A detected by the temperature sensor 25, and the storage unit 1
03 from the output reference value Vc stored in the temperature sensor 2
The output reference value Vc corresponding to the detected temperature A of 5 is selected and read. Then, the deviation ΔV between the read output reference value Vc and the output value Vs of the CO sensor S is calculated. Storage means 1
03 stores the deviation ΔV calculated by the deviation calculating means 104.

The storage means 103 stores the cumulative combustion time J of the burner 2 up to the last time. The deterioration degree detecting means 102 is provided with a time counter that integrates the combustion time t of the burner 2. The deterioration degree detecting means 102 starts a time counter when the combustion of the burner 2 is started,
The combustion time t of the burner 2 is integrated in a state where it is further integrated with the previous integrated combustion time J stored in the storage means 103. When the combustion of the burner 2 is stopped, the time counter is stopped and reset, and the integrated combustion time J that has been integrated is stored in the storage means 103.
That is, the deterioration degree detecting means 102 is configured to detect the integrated combustion time J obtained by integrating the combustion time t of the burner 2 as the deterioration degree.

The correcting means 105 corrects the output value Vs as follows. Until the cumulative combustion time J reaches the correction amount changing set value J ₁ , based on the following equation (2),
Correct the sensitivity α. α = αc−K ₁ × J (2) Further, after the integrated combustion time J reaches the correction amount changing set value J ₁ , the sensitivity α is calculated based on the following equation (3). to correct. α = αc−K ₁ × J ₁ −K ₂ × (J−J ₁ ) ... (3) However, K ₁ and K ₂ are correction coefficients of positive numbers, respectively, and K ₂
> K ₁ . The correction amount changing set value J ₁ is set to, for example, about 2000 hours. FIG. 6 shows the correlation between the sensitivity α and the integrated combustion time J.

In the above equation (3), the cumulative combustion time J at which the sensitivity α becomes, for example, αc × (3/5) is set as the alarm set value J ₂ , and the sensitivity α is, for example, αc ×
The integrated combustion time J which becomes (1/2) is set as the stop set value J ₃ . However, J ₁ <J ₂ <J ₃ .
Further, β is changed by the following equation (4) based on the deviation ΔV stored in the storage means 103. β = Vcc-ΔV (4) Further, from the output reference value Vc stored in the storage means 103, the output reference value V corresponding to the temperature A detected by the temperature sensor 25.
c is selected, and the output value Vs is temperature-corrected by the following equation (5) based on the selected output reference value Vc and Vcc stored in advance. Vs = Vs- (Vc-Vcc) (5) Then, the sensitivity α calculated by the above formula (2) or (3), the β calculated by the above formula (4), and the above formula (5). ), The CO concentration D is calculated by the above equation (1) based on the temperature-corrected output value Vs. That is, the correction means 105 is configured to correct the output value Vs and calculate the CO concentration D by correcting the sensitivity α based on the integrated combustion time J. Further, when the integrated combustion time J reaches the correction amount changing set value J ₁ , the correction amount for correcting the sensitivity α, and thus the correction amount for correcting the output value Vs, is increased.

When the integrated combustion time J reaches the set value for stop J ₃ , the combustion control means 101 is instructed to stop the combustion of the burner 2 and the subsequent operation prohibition control of the water heater Y. Further, by turning on the LED lamp 16, the user is instructed to replace the CO sensor S. That is, the CO sensor S is prevented from being used in an extremely deteriorated state. When the integrated combustion time J reaches the alarm set value J ₂ , the LED lamp 17 is turned on to prompt the user for maintenance. That is, in order to avoid inconvenience to the user because the water heater Y cannot be used carelessly, a maintenance command is issued before the cumulative combustion time J reaches the stop set value J ₃ , and the CO The maintenance of replacement of the sensor S is promoted.

When the service engineer replaces the CO sensor S with a new one, the reset switch 19 is operated to rewrite the output reference values Vc, αc, and Vcc with the new CO sensor S data, and the integrated combustion time J is set to zero. It is configured to rewrite. The reset switch 19 is provided inside a casing (not shown) of the controller H so that it cannot be operated by a general user.

The incomplete combustion determination means 106 is the correction means 1
The CO concentration D calculated by 05 is the set concentration (for example, 100
If the state of 0 ppm) or more continues for a set time (for example, 20 seconds) or more, it is determined that the state is an incomplete combustion state, and the LED lamp 18 is turned on to report that the state is an incomplete combustion state.

The combustion control means 101 is a correction means 105.
However, the cumulative combustion time J is the set value J for stop ₃Determined to have reached
Then, the combustion of the burner 2 is stopped and
The control for prohibiting the use of the water heater Y is executed. Incomplete
When the combustion determination means 106 determines the incomplete combustion state,
Combustor 2 stops and the after par
Run

Immediately after starting the combustion of the burner 2, a transient incomplete combustion state occurs in the combustion of the burner 2 and the CO concentration D temporarily becomes extremely high. Therefore, the incomplete combustion determination means 10
In order that 6 does not discriminate the transient incomplete combustion state immediately after the start of combustion, the incomplete combustion discriminating means 106 is operated by the time restraint means 107 while the set time (for example, 60 seconds) has elapsed after the start of combustion. Is configured to restrain.

The control operation of the hot water supply apparatus of this embodiment will be described below with reference to the flow chart shown in FIG.
First, when opening of the hot water tap is detected by the water supply amount sensor 9, the incomplete combustion determination means 1 is made by the timed check means 107.
Starting the timed check of 06, and the combustion control means 10
1 starts combustion of the burner 2 [steps # 1 to #
4]. In other words, the combustion control means 101 starts blowing the fan 4 (pre-purge) and sparking by the igniter 30 to open the electromagnetic proportional valve 11 and the intermittent valve 12 to start the combustion of the burner 2. Whether the flame transfer to the burner 2 is completed or not is detected by the frame rod 31.

When the combustion of the burner 2 is started, the deterioration degree detecting means 102 starts a time counter for counting the combustion time [step # 5]. After the combustion of the burner 2 is started, the combustion control means 101 executes combustion control (proportional control as described above) during the timed control by the timed control means 107 [step # 6]. When the time limit check by the time limit check means 107 is completed [step # 7], the sensor power supply is turned on, and the CO sensor S is heated to a predetermined temperature after the energization time has passed [steps # 8 to # 9]. The combustion control unit 101 executes the combustion control (proportional control as described above), the deterioration degree detection unit 102 executes the deterioration degree detection control, and the correction unit 105 executes the correction control [steps # 10 to # 12].

Then, the incomplete combustion discriminating means 106 executes the following incomplete combustion discriminating control. The CO concentration D calculated by the correction unit 105 is the set concentration (for example,
1000 ppm), the counter C ₁ is started, and when the state where the CO concentration D is higher than the set concentration continues for a set time (for example, 20 seconds) or more, it is determined that the state is an incomplete combustion state, The LED lamp 18 is turned on to report that the incomplete combustion state is present [steps # 13 to # 16], and the process proceeds to step # 19. Step #
If the CO concentration D is smaller than the set concentration in step 13, the counter C ₁ is reset [step # 17] and the process proceeds to step # 18.
When the state where the density is larger than the set density does not continue for the set time or longer, the process proceeds to step # 18.

When the incomplete combustion determination control as described above is completed, it is determined in step # 18 whether or not the hot water tap is closed. If the hot water tap is not closed, step # 18 is determined.
Returning to step 10, when the hot water tap is closed, the combustion control means 101 closes the electromagnetic proportional valve 11 and the intermittent valve 12 to stop the combustion of the burner 2 [step # 19], and the deterioration degree detection means 102 is used. The time counter is stopped and reset [step # 20], and the after-purge is executed by the combustion control means 101 [step # 21]. Subsequently, the deviation calculation means 104 executes deviation calculation control [step # 22], and then the CO sensor power supply is turned off [step # 23] to start the next combustion in a non-combustion state such as a pilot fire state. Be ready for

Next, the deviation calculation control will be described with reference to the flow chart shown in FIG. When the counter C ₂ is started and the counter C ₂ counts up and a set time (for example, 30 minutes) elapses, the detected temperature A of the temperature sensor 25 and the output value Vs of the CO sensor S are read [Step # 31- # 34]. continue,
The output reference value Vc corresponding to the detected temperature A of the temperature sensor 25 is selected from the output reference value Vc stored in the storage means 103 and read, and the deviation between the read output reference value Vc and the output value Vs of the CO sensor S. ΔV is calculated [step # 35]. When the deviation ΔV is larger than zero, the deviation ΔV stored in the storage unit 103 is rewritten to the deviation ΔV calculated this time [steps # 36 and # 37], and the process returns.

Next, the deterioration degree detection control and the correction control will be described based on the flowchart shown in FIG. The storage means 10 is based on the count information of the time counter.
The combustion time t of the burner 2 is integrated in a state where it is further integrated with the previous integrated combustion time J stored in No. 3 [step # 41]. Until the integrated cumulative combustion time J reaches the correction amount changing set value J ₁ , the sensitivity α is corrected based on the above equation (2), and the integrated combustion time J becomes the correction amount changing set value J ₁ . After reaching the set value J ₃ for stop, the sensitivity α is corrected based on the above equation (3), and when the cumulative combustion time J reaches the set value J ₂ for alarm, the LED
When the lamp 17 is turned on, a maintenance command is reported, and when the integrated combustion time J reaches the stop set value J ₃ , the combustion control means 101 stops combustion of the burner 2 and the water heater thereafter. By instructing the Y prohibition control and turning on the LED lamp 16, the CO
Report sensor S replacement command [Steps # 42 to # 4
9].

Subsequently, the output value Vs of the CO sensor S and the temperature A detected by the temperature sensor 25 are read, and
The deviation ΔV is read from the storage means 103 [Step # 5.
0- # 52]. Subsequently, β is changed based on the above formula (4), the output value Vs is temperature-corrected based on the above formula (5), and then the CO concentration D is calculated based on the above formula (1). And return [Steps # 53- # 5
5].

[Second Embodiment] Next, FIG. 10 to FIG.
A second embodiment of the present invention will be described based on FIG. The storage means 103 is configured to store the cumulative combustion heat quantity Q of the burner 2 up to the previous time, in addition to the various storage information described in the first embodiment. The deterioration degree detecting means 102 includes a time counter for integrating the combustion time t of the burner 2,
Also, a heat quantity integrating means for integrating the combustion heat quantity q of the burner 2 is provided. The heat quantity integrating means calculates the integrated combustion heat quantity Q by multiplying the weighting coefficient g set according to the combustion heat quantity q as shown in FIG. 10 by multiplying the value (g × q) obtained by multiplying the combustion heat quantity q. . That is, the combustion heat quantity q is weighted to integrate the combustion heat quantity q.

The burner 2 is configured so that the combustion state can be switched so that when the combustion heat quantity q is large, the whole combustion is performed, and when the combustion heat quantity q is small, the partial combustion is performed, in which a part is burned. ing. In FIG. 10, C2 shows the weighting coefficient g at the time of whole combustion, and C1 shows the weighting coefficient g at the time of partial combustion. The weighting coefficient g in the partial combustion is set to be larger than that in the total combustion. This is because the combustion gas is brought into sufficient contact with the CO sensor S even during the partial combustion, so that the concentration of the combustion gas is high even though the combustion heat quantity q is small.

When the combustion of the burner 2 is started, the deterioration degree detecting means 102 starts a time counter, and the accumulated combustion time J stored in the storage means 103 up to the previous time is stored.
Further, the combustion time t of the burner 2 is integrated in the state of further integrating. In addition, the storage means 10 is started by starting the heat quantity integrating means.
The combustion heat quantity q of the burner 2 is added in a state where it is further added to the previous cumulative combustion heat quantity Q stored in 3. When the combustion of the burner 2 is stopped, the time counter and the calorific value integrating means are stopped and reset, and the integrated cumulative combustion time J and the cumulative calorific value Q are stored in the storage means 103. That is, the deterioration degree detection means 10
2 is configured to detect the integrated combustion time J obtained by integrating the combustion time t of the burner 2 and the integrated combustion heat amount Q obtained by integrating the combustion heat quantity q of the burner 2 as the deterioration degree.

The correcting means 105 corrects the output value Vs as follows. Cumulative combustion time J and cumulative combustion heat quantity Q
The sensitivity α is corrected based on the following equation (6) until either of the values reaches the correction amount changing set values J ₁ and Q ₁ set for each of them. α = αc−K ₃ × Q (6) Further, either one of the integrated combustion time J and the integrated combustion heat quantity Q is the correction value changing set value J which is set for each of them. After reaching ₁ , Q ₁ , the sensitivity α is corrected based on the following equation (7). α = αc−K ₃ × Q ₁ −K ₄ × (Q−Q ₁ ) ... (7) However, K ₃ and K ₄ are correction coefficients of positive numbers, respectively, and K ₄
> K ₃ . In the above formula (7), the cumulative combustion heat quantity Q at which the sensitivity α becomes, for example, αc × (3/5) is set as the alarm set value Q ₂ , and the sensitivity α is, for example, αc ×
The integrated combustion heat quantity Q that becomes (1/2) is set as the stop set value Q ₃ . However, Q ₁ <Q ₂ <Q ₃ .
Further, β is changed by the above equation (4) based on the deviation ΔV stored in the storage means 103. Further, the output reference value Vc corresponding to the detected temperature A of the temperature sensor 25 is selected from the output reference value Vc stored in the storage means 103, and based on the selected output reference value Vc and Vcc stored in advance. The output value Vs is temperature-corrected by the above equation (5). Then, based on the sensitivity α calculated by the above formula (6) or (7), β calculated by the above formula (4), and the output value Vs temperature-corrected by the above formula (5), the above formula (1 ), The CO concentration D is calculated.

That is, the correcting means 105 corrects the sensitivity α based on the integrated combustion heat quantity Q to obtain the output value V
The CO concentration D is calculated by correcting s. Further, when either one of the integrated combustion time J and the integrated combustion heat amount Q reaches the correction amount changing set values J ₁ and Q ₁ which have been set for each of them, the correction for correcting the sensitivity α is made. The amount, and thus the correction amount for correcting the output value Vs, is increased.

When the integrated combustion heat quantity Q reaches the set value Q ₃ for stop, the combustion control means 101 is instructed to stop the combustion of the burner 2 and the subsequent operation prohibition control of the water heater Y. Further, by turning on the LED lamp 16, the user is instructed to replace the CO sensor S. That is, the CO sensor S is prevented from being used in an extremely deteriorated state. When the integrated combustion heat quantity Q reaches the alarm set value Q ₂ , the LED lamp 17 is turned on to prompt the user for maintenance. That is, in order to avoid inconvenience to the user because the water heater Y cannot be used carelessly, a maintenance command is issued before the cumulative combustion heat amount Q reaches the stop set value Q ₃ , and the CO It promotes maintenance for sensor replacement.

The second embodiment has the same structure as that of the first embodiment except that the deterioration degree detecting means 102, the storage means 103 and the correcting means 105 are respectively arranged as described above. Is omitted.

FIG. 11 shows a flow chart of the control operation in the hot water supply apparatus of the second embodiment. The flowchart shown in FIG. 11 is the same as the flowchart shown in FIG. 7 in the first embodiment, except that step # 5a is inserted between step # 5 and step # 6 and step # 20a is inserted between step # 20 and step # 21. Figure 7 except that
It is similar to the flowchart shown in FIG. Therefore, the control operation other than step # 5a and step # 20a is the same as the control operation described in the first embodiment based on the flowchart shown in FIG.
That is, when the combustion of the burner 2 is started in step # 4, the deterioration degree detecting means 102 causes a time counter for counting the combustion time t of the burner 2 and a heat quantity integrating means for integrating the combustion heat quantity q of the burner 2. Start [Steps # 5 and # 5a]. When the combustion of the burner 2 is stopped in step # 19, the deterioration degree detecting means 102
Stops and resets the time counter and the calorific value integrating means [steps # 20 and # 20
a].

Next, the deterioration degree detection control and the correction control will be described based on the flowchart shown in FIG.
Storage means 1 based on the count information of the time counter
03, the combustion time t of the burner 2 is integrated in a state where it is further integrated with the integrated combustion time J up to the previous time, and the storage means 10 is based on the integrated information of the heat quantity integration means.
The combustion heat quantity q of the burner 2 is added in a state where it is further added to the previous cumulative combustion heat quantity Q stored in No. 3 [steps # 61 and # 62]. Until either one of the cumulative combustion time J and the cumulative combustion heat quantity Q reaches the correction amount changing set values J ₁ and Q ₁ which have been set for each of them, the equation (6) is used. , The sensitivity α is corrected, and the cumulative combustion time J
Either one of the integrated combustion heat quantity Q and the integrated combustion heat quantity Q reaches the correction quantity change set values J ₁ and Q ₁ set for each of them _first , and then the integrated combustion heat quantity Q reaches the stop set value Q ₃ . Up to the above, the sensitivity α is corrected based on the above equation (7), and when the integrated combustion heat quantity Q reaches the alarm set value Q ₂ , the LED lamp 17 is turned on to maintain the maintenance command. When the integrated combustion heat quantity Q reaches the set value for stop Q ₃ , the burner 2 is sent to the combustion control means 101.
The combustion stop and the subsequent operation prohibition control of the water heater Y are instructed, and the LED lamp 16 is turned on to notify the user of the CO sensor S replacement command [steps # 63 to # 71].

Subsequently, the output value Vs of the CO sensor S and the temperature A detected by the temperature sensor 25 are read, and
The deviation ΔV is read from the storage means 103 [step # 7.
2- # 74]. Subsequently, β is changed based on the above formula (4), the output value Vs is temperature-corrected based on the above formula (5), and then the CO concentration D is calculated based on the above formula (1). And return [Steps # 75- # 7
7].

[Other Embodiments] Next, other embodiments will be listed. As the value corresponding to the state in which the unburned component is generated, various values other than those exemplified in the above-mentioned embodiments can be applied. For example, the number of times the burner 2 is ignited or extinguished and the temperature A detected by the temperature sensor 25 may be applied. When the ignition or extinguishing frequency of the burner 2 is applied, the deterioration degree detecting means 1
02 is configured as follows. A counter that integrates the number of ignitions (or the number of extinctions) n of the burner 2 is provided, and the integrated number of ignitions (or the number of extinguishing extinctions) N that is obtained by integrating the number of ignitions (or the number of extinctions) n is detected as the deterioration degree.
When the detected temperature A of the temperature sensor 25 is applied, the deterioration degree detecting means 102 is configured as follows. A temperature integrating means for integrating the detected temperature A of the temperature sensor 25 is provided, and the integrated temperature obtained by integrating the detected temperature A by the temperature integrating means is detected as the degree of deterioration.

The correction means 105 is the deterioration degree detection means 1
The output value V of the CO sensor S based on the detected deterioration degree of 02.
The output value Vs of the CO sensor S may be corrected by correcting the addition value B added to s. For example, when the detected deterioration degree is the integrated combustion time J, the added value B is corrected based on the following equation. B = K ₅ × J where K ₅ is a positive constant. Then, the output value Vs is corrected based on the following equation. Vs = Vs + B In this case, the CO concentration D is calculated with α = αc in the above equation (1) without correcting the sensitivity α. Further, the cumulative combustion time J may be divided into a plurality of sections, and the addition value B may be set for each section so that the addition value B is corrected so as to increase stepwise.

In each of the above embodiments, the correction amount for correcting the sensitivity α is changed in two steps. However, instead of this, the correction amount for correcting the sensitivity α may not be changed. In this case, the control configuration becomes simple. The correction amount for correcting the sensitivity α is 3
It may be changed in more steps. In this case, it is possible to further prevent the occurrence of late disconnection due to the long usage time of the water heater.

In each of the above embodiments, the case where the sensitivity α is corrected by a linear function is illustrated, but instead of this,
The sensitivity α may be corrected stepwise by dividing the integrated combustion time J or the integrated combustion heat quantity Q into a plurality of sections and setting the sensitivity α for each section.

In the second embodiment described above, the deterioration degree detecting means 102 is exemplified to be configured to perform the weighting according to the combustion heat quantity q to integrate the combustion heat quantity q, but simply without weighting. The combustion heat quantity q may be integrated.

In the flowchart of the first embodiment shown in FIG. 9, step # 54 is omitted, or
The incomplete combustion determination means 105 may be configured such that step # 76 is omitted in the flowchart of the second embodiment shown in FIG. 12 and the temperature correction of the output value Vs is not performed. This is because, as shown in FIG. 4, in the combustion region where the ambient temperature A is 70 to 200 ° C., the temperature characteristic is small, and therefore there is an error even if the CO concentration D is calculated without correcting the temperature of the output value Vs. Because it is small. Therefore, the control configuration of the incomplete combustion determination means 105 becomes simple.

In each of the above embodiments, the correction means 105
Is configured to calculate the CO concentration D by correcting the output value Vs based on the deterioration degree detected by the deterioration degree detecting unit 102, and the incomplete combustion determining unit 106 sets the calculated CO concentration D by the correcting unit 105. Based on this, the incomplete combustion state is determined. Instead of this, since there is a certain correlation between the output value Vs and the CO concentration D, the correction means 105
Is configured to correct the output value Vs based on the detected deterioration degree of the deterioration degree detection means 102 without calculating the CO concentration D, and the incomplete combustion determination means 106 is corrected by the correction output value of the correction means 105. The incomplete combustion state may be determined based on the above.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an overall configuration of a combustion device in a first embodiment.

FIG. 2 is a schematic diagram showing the overall configuration of a CO sensor in the first embodiment.

FIG. 3 is a diagram showing a bridge circuit of a CO sensor in the first embodiment.

FIG. 4 is a diagram showing a correlation between an output value of a CO sensor and an atmospheric temperature when CO is zero in the first embodiment.

FIG. 5 is a diagram showing a correlation between the CO concentration and the output value of the CO sensor in the first embodiment.

FIG. 6 is a diagram showing a correlation between the cumulative combustion time and the sensitivity of the CO sensor in the first embodiment.

FIG. 7 is a flowchart of control operation in the first embodiment.

FIG. 8 is a flowchart of a control operation in the first embodiment.

FIG. 9 is a flowchart of a control operation in the first embodiment.

FIG. 10 is a diagram showing a correlation between a combustion heat quantity of a burner and a weighting coefficient in the second embodiment.

FIG. 11 is a flowchart of control operation in the second embodiment.

FIG. 12 is a flowchart of control operation in the second embodiment.

[Explanation of symbols]

 Burner 2 ventilation means 4 deterioration degree detection means 102 correction means 105 incomplete combustion determination means 106 unburned component sensor S

Claims (9)

[Claims] 1. A combustion apparatus comprising a burner (2) and ventilation means (4) for ventilating combustion air to the burner (2) and discharging combustion gas from the burner (2), A contact combustion type unburned component sensor (S) which is provided in contact with the combustion gas of the burner (2) and outputs an output value according to the concentration of the unburned component contained in the combustion gas.
And a deterioration degree detecting means (102) for detecting the deterioration degree of the unburned component sensor (S), and the unburned component sensor (S) based on the detected deterioration degree detected by the deterioration degree detecting means (102). Correction means (105) for correcting the output value of (1), and incomplete combustion determination means (10) for determining the incomplete combustion state based on the corrected output value corrected by the correction means (105).
6) is provided, the incomplete combustion detection device for a combustion device, wherein the deterioration degree detecting means (102) integrates a value corresponding to a state in which an unburned component is generated, as the deterioration degree. An incomplete combustion detection device for a combustion device configured to detect. 2. The incomplete combustion detection device for a combustion device according to claim 1, wherein the value corresponding to the state in which the unburned component is generated is the combustion time of the burner (2). 3. The incomplete combustion detection device for a combustion device according to claim 1, wherein the value corresponding to the state in which the unburned component is generated is the combustion heat quantity of the burner (2). 4. The incomplete combustion detection device for a combustion device according to claim 1, wherein the value corresponding to the state in which the unburned component is generated is the number of ignitions or extinguishments of the burner (2). 5. The deterioration degree detecting means (102) is configured to perform weighting according to the amount of heat of combustion of the burner (2) and integrate a value corresponding to a state in which the unburned component is generated. The incomplete combustion detection device for a combustion device according to claim 1, 2, 3, or 4. 6. The correction means (105) corrects the output value of the unburned component sensor (S) by correcting the sensitivity of the unburned component sensor (S) based on the detected deterioration degree. Claims 1, 2, 3, 4 configured to
Or an incomplete combustion detection device for a combustion device according to item 5. 7. The uncombustion component sensor (S) by correcting the addition value to be added to the output value of the uncombustion component sensor (S) based on the detected deterioration degree. The incomplete combustion detecting device for a combustion device according to claim 1, wherein the incomplete combustion detecting device is configured to correct the output value. 8. The correction means (105) is configured to change a correction amount for correcting an output value of the unburned component sensor (S) when the detected deterioration degree reaches a set value. The incomplete combustion detection device for a combustion device according to claim 1, 2, 3, 4, 5, 6 or 7. 9. The deterioration degree detecting means (102) calculates an integrated combustion time obtained by integrating a combustion time of the burner (2) and an integrated combustion heat quantity obtained by integrating a combustion heat quantity of the burner (2). The correction means (105) is configured to correct the output value of the unburned component sensor (S) based on the integrated combustion heat quantity, and the integrated combustion time and When any one of the integrated combustion heat amounts reaches the set value set for each of them, the correction amount for correcting the output value of the unburned component sensor (S) is changed. Claim 1,
An incomplete combustion detection device for a combustion device according to 5, 6, or 7.