JP4919499B2 - Combustion device - Google Patents

Description

  The present invention includes an unburned component detection unit that outputs a detection value corresponding to the concentration of unburned components in the burner combustion gas, and a temperature detection unit that outputs a detection value corresponding to the ambient temperature of the unburned component detection unit. On the basis of the unburned component detecting means configured to be integrated and the detected value of the unburned component detecting section and the detected value of the temperature detecting section in the unburned component detecting means. The present invention relates to a combustion apparatus provided with unburned component concentration calculating means for obtaining the unburned component concentration in gas.

In the above combustion apparatus, conventionally, as an example of the unburned component detection means, an unburned component detection unit that outputs a detection value corresponding to the concentration of carbon monoxide (CO) that is an example of the unburned component concentration; A contact combustion CO sensor configured integrally with a temperature detection unit that outputs a detection value corresponding to the ambient temperature of the unburned component detection unit is in an exhaust path for exhausting combustion gas of the burner to the outside. There was a thing of the composition provided in. And the unburned component detection part in the contact combustion type CO sensor has the characteristic that the detected value of the unburned component concentration changes depending on the difference in the ambient temperature, but the ambient temperature and the unburned component are in a state of zero. A configuration in which a correlation with a corresponding reference detection value is measured and stored in advance, an ambient temperature is detected by a temperature detection unit, and an unburned component concentration is obtained based on the detected ambient temperature and the correlation. Thus, the detection error due to the difference in ambient temperature is reduced, and the unburned component concentration can be detected with high accuracy (see, for example, Patent Document 1).
Incidentally, in the configuration of Patent Document 1, it is determined that the burner is in an incomplete combustion state when the detected unburned component concentration is higher than the set upper limit concentration.

JP-A-8-14556

  By the way, in order to appropriately detect the unburned concentration in the burner combustion gas, the unburned component detection means, for example, allows the burner combustion gas to flow in an exhaust passage through which the burner combustion gas flows. It is fixedly provided at the set position. And the unburned component detection means is fixedly provided by an attachment structure that cannot be easily removed or installed.

  However, in the event of maintenance of the combustion apparatus, etc., unburned components should not be in a position where the burner combustion gas flows from the set position or only a part of the burner combustion gas flows. If the installation position of the detection means is changed, the unburned component concentration in the combustion gas may not be detected properly. However, even if such a state occurs in the conventional combustion apparatus, it remains as it is. There is room for improvement in this respect.

  The objective of this invention is providing the combustion apparatus which can detect that it is an abnormal state which cannot detect the unburned component density | concentration in combustion gas appropriately.

  The combustion apparatus according to the present invention outputs an unburned component detection unit that outputs a detection value corresponding to the unburned component concentration in the burner combustion gas, and outputs a detection value corresponding to the ambient temperature of the unburned component detection unit. Based on the unburned component detection means configured integrally with the temperature detection unit, the detection value of the unburned component detection unit and the detection value of the temperature detection unit in the unburned component detection unit, Unburned component concentration calculating means for obtaining the unburned component concentration in the combustion gas of the burner, the first characteristic configuration is that the detected value of the temperature detection unit during combustion of the burner An abnormality determining means is provided for determining whether or not an abnormal state does not correspond to the burner combustion.

  According to the first characteristic configuration, the abnormality determination means determines whether or not the detected value of the temperature detection unit during combustion of the burner is in an abnormal state not corresponding to combustion of the burner.

In other words, the unburned component detection means is configured by integrally incorporating the unburned component detection unit and a temperature detection unit that outputs a detection value corresponding to the ambient temperature of the unburned component detection unit. Therefore, if it is installed at a preset position for detecting the unburned component concentration in the combustion gas of the burner, both the unburned component detection unit and the temperature detection unit are the combustion gas. When the burner burns, it is assumed that the ambient temperature of the unburned component detection unit becomes a high temperature corresponding to the temperature of the combustion gas of the burner.
However, the detection value of the temperature detection unit does not increase even though the burner starts to burn, or the detection value of the temperature detection unit is lower than the set temperature corresponding to combustion, even though the burner is burning. If it is assumed that it is abnormal, it is considered that the concentration of unburned components in the combustion gas cannot be detected properly. It is determined that the state is abnormal.

  In addition, when it is determined that the abnormal state is detected by the abnormality determining unit, an abnormal state is obtained by performing a process such as issuing an alarm or stopping the combustion of the burner. It is possible to take measures against time.

  Incidentally, the unburned component concentration calculating means obtains the unburned component concentration in the burner combustion gas based on the detected value of the unburned component detecting section and the detected value of the temperature detecting section in the unburned component detecting means. Become. In other words, the unburned component detection unit has a characteristic that the detection value of the unburned component concentration changes depending on the difference in the ambient temperature, but the ambient temperature is detected by the temperature detection unit and information on the detected value is used. Thus, the detection error due to the difference in ambient temperature can be reduced, and the unburned component concentration can be obtained with high accuracy.

  Therefore, according to the first characteristic configuration, it is possible to provide a combustion apparatus capable of detecting an abnormal state in which the unburned component concentration in the combustion gas cannot be detected appropriately.

  According to a second characteristic configuration of the present invention, in addition to the first characteristic configuration, the abnormality determination means sets an increase amount of the detection value of the temperature detection unit until a set time elapses after the start of combustion of the burner. It is the point which is comprised so that the state smaller than quantity may be discriminate | determined as the said abnormal state.

  According to the second feature configuration, the abnormality determination unit is configured so that the amount of increase in the detected value of the temperature detection unit from the start of combustion of the burner until the set time elapses is smaller than the set amount. The state is determined to be the abnormal state.

That is, if the unburned component detection means is installed at the set position, when the burner starts combustion, the ambient temperature of the unburned component detection unit will increase due to the influence of the high-temperature combustion gas of the burner. For example, the detection value of the temperature detector rises from a low temperature corresponding to the outside air temperature to a temperature of the combustion gas or a temperature close thereto.
However, if the amount of increase in the detected value of the temperature detection unit from the start of combustion of the burner until the set time elapses is smaller than the set amount, the unburned component detection unit is not positioned at the combustion gas flow point. In such a case, the abnormality determining means determines that the concentration of unburned components in the combustion gas cannot be properly detected.

  As described above, since the abnormality determination means determines whether or not the abnormal state is present until the set time elapses after the burner starts combustion, whether or not the burner is in an abnormal state is determined. The abnormal state can be determined in a short time after starting the combustion, and the abnormal state can be determined at an early stage after the start of combustion.

  Therefore, according to the second feature configuration, the abnormal state can be determined at an early stage after the start of combustion of the burner, and the disadvantage of continuing the combustion state for a long time while remaining in the abnormal state can be avoided.

  According to a third feature configuration of the present invention, in addition to the first feature configuration or the second feature configuration, the abnormality determination means indicates that the detected value of the temperature detection unit is lower than a set temperature during combustion of the burner. The point is that it is configured to determine that the state is abnormal.

  According to the third characteristic configuration, the abnormality determining means determines that the detected value of the temperature detector is lower than the set temperature during combustion of the burner as an abnormal state.

That is, when the burner is not combusting, the detected value of the temperature detection unit is the outdoor temperature at that time or a temperature close thereto, but if the unburned component detection means is installed at the set position, When the gas burns, the ambient temperature of the unburned component detection unit rises due to the influence of the high-temperature combustion gas of the burner, so that the detection value of the temperature detection unit becomes higher than the set temperature.
However, if the detected value of the temperature detection unit is lower than the set temperature during combustion of the burner, the unburned component in the combustion gas, for example, the unburned component detection unit is not located at the flow point of the combustion gas. Since it is considered that the concentration cannot be detected properly, it is considered an abnormal state. In such a case, the abnormality determination unit determines that the concentration is abnormal.

  In this manner, since the abnormality determination unit determines whether or not the detection value of the temperature detection unit is lower than the set temperature, the set temperature is suitable for determining the presence or absence of combustion gas. If it is set to a certain temperature, it is possible to accurately determine whether or not it is in an abnormal state, and since the abnormality is determined by determining the threshold value, the processing configuration for determination is simplified. There are also advantages.

  Therefore, according to the third feature configuration, it is possible to determine whether or not the state is abnormal with a simple configuration.

  According to a fourth feature configuration of the present invention, in addition to any of the first feature configuration to the third feature configuration, when the abnormality determining unit determines that the abnormal state is present, a notification process for operating the notification unit is executed. It is in the point comprised as follows.

  According to the fourth characteristic configuration, when the abnormality determination unit determines that the abnormality state is present, the abnormality determination unit executes the notification process of operating the notification unit, so that the user of the combustion apparatus can recognize that it is in the abnormal state. It is possible to stop the use of the combustion apparatus and perform post-processing such as maintenance.

  Therefore, according to the fourth feature configuration, post-processing such as maintenance can be performed, and the safety in use can be improved.

  The fifth feature configuration of the present invention, in addition to any one of the first feature configuration to the fourth feature configuration, stops the combustion of the burner when the abnormality determination means determines that it is in the abnormal state, and The subsequent burner ignition process is prohibited.

  According to the fifth characteristic configuration, when the abnormality determining means determines that the abnormality is present, the combustion of the burner is stopped and the ignition process of the burner thereafter is prohibited, so that the abnormality remains in the abnormal state. Inconveniences such as continuous burning of the burner and repeated ignition processing can be avoided.

  Therefore, according to the fifth characteristic configuration, it is possible to avoid the inconvenience that the burner burns in the abnormal state, and to improve the safety in use.

Hereinafter, an embodiment when the combustion device of the present invention is applied to a hot water supply device as an example of the combustion device will be described.
As shown in FIG. 1, the hot water supply apparatus includes a hot water supply unit Y, a control unit H that controls the operation of the hot water supply unit Y, and a remote operation type operation unit R.
The hot water supply unit Y includes a combustion chamber 1, a heat exchanger 3 for water heating provided in the combustion chamber 1, and a burner 2 provided in the combustion chamber 1 for heating the heat exchanger 3. An exhaust passage 5 connected to the upper part of the combustion chamber 1 for discharging the combustion gas of the burner 2, a fan 4 for venting the combustion air through the burner 2 and discharging the combustion gas of the burner 2 through the exhaust passage 5, and heat A water supply path 6 for supplying heating water to the exchanger 3, a hot water supply path 7 for supplying hot water heated in the heat exchanger 3 to a hot water tap (not shown), and a fuel for supplying gas fuel to the burner 2 A supply path 8 and the like are provided.

The water supply passage 6 is provided with a water supply amount sensor 9 for detecting the amount of water supplied to the heat exchanger 3, and the hot water supply passage 7 is provided with a hot water supply temperature sensor 10 for detecting a hot water supply temperature with respect to the hot water tap.
The fuel supply path 8 is connected to a general household gas supply pipe. The fuel supply path 8 is an electromagnetic proportional valve 11 that adjusts the amount of gas fuel supplied to the burner 2 and the supply of gas fuel is intermittent. And an on-off valve 12 is provided. Further, an igniter 13 for igniting the burner 2 and a frame rod 14 for detecting the ignition of the burner 2 are provided near the burner 2.

  The operation unit R is connected to the control unit H by a communication line, and an operation switch 15 that commands operation and stop of the hot water supply device, a temperature setting switch 16 that sets a target hot water supply temperature, and whether or not the hot water supply device is operated. Are provided, an operation lamp 17 for displaying a combustion abnormality notification lamp 18 for informing that a combustion abnormality described later has occurred, an abnormal state notification lamp 19 for notifying that an abnormal state described later has occurred, and the like.

  And the unburned component detection part Sa which outputs the detected value corresponding to the carbon monoxide concentration (henceforth CO concentration) as unburned component density | concentration in the combustion gas of the burner 2, and the unburned component detection part Sa A catalytic combustion type CO sensor S is provided as an unburned component detection unit configured integrally with a temperature sensor 25 as a temperature detection unit that outputs a detection value corresponding to the ambient temperature. The CO sensor S is provided in the exhaust passage 5 in contact with the combustion gas of the burner 2.

  The CO sensor S will be described in detail. As shown in FIG. 2, the CO sensor S includes a sensor element 23, a temperature compensation reference element 24, and a CO sensor S mounted on a pedestal 22 inside a protective frame 21 made of stainless steel. A temperature sensor 25 for detecting the atmospheric temperature Ta and two resistance elements 26 and 27 are provided. The sensor element 23 and the temperature compensation reference element 24 are each composed of a platinum wire carrying a catalyst, and the sensor element 23, the temperature compensation reference element 24, and the resistance elements 26 and 27 are shown in FIG. As shown, the current supply is performed in a state of being connected to the bridge circuit state and controlled by the sensor control unit 100 configured by the control unit H as will be described later.

  The sensor element 23 and the temperature compensating reference element 24 are heated to about 250 ° C. when the amount of current is controlled by the sensor control unit 100, and carbon monoxide (CO) in contact with the surface is catalyzed. Burn. At this time, since the catalyst supported on the sensor element 23 has selectivity for carbon monoxide (CO), there is a difference in element temperature between the sensor element 23 and the temperature compensating reference element 24. Further, since the resistance value of the platinum wire changes depending on the temperature, the difference between the resistance values of the sensor element 23 and the temperature compensating reference element 24 increases as the CO concentration in the combustion gas increases.

That is, the output value Vs corresponding to the CO concentration in the combustion gas is a voltage from the connection between the sensor element 23 and the temperature compensation reference element 24 and the connection between the resistance element 26 and the resistance element 27 in the bridge circuit. It is configured to output as a value (unit: volt). Note that reference numeral 28 in FIG. 2 denotes a connector portion with a lead wire connected to the control portion H.
Therefore, the sensor element 23, the temperature compensation reference element 24, and the resistance elements 26 and 27 constitute an unburned component detection unit Sa, and the output value Vs corresponds to the detection value of the unburned component detection unit Sa. .

  The output value Vs of the CO sensor S has a temperature characteristic that changes according to the ambient temperature Ta even if the CO concentration is the same, and the relationship is shown in FIG. FIG. 4 shows temperature characteristics of the output value Vs of the CO sensor S when the CO concentration D is predicted to be zero. A solid line L1 in FIG. 4 indicates that the CO sensor S has deteriorated. The temperature characteristic of the zero point output value of the CO sensor S when the CO concentration D is predicted to be zero when there is not (for example, before shipment or until the first burner combustion) is shown.

  In FIG. 4, the output value Vs of the CO sensor S increases as the CO concentration D increases and the solid line L1 is translated in the direction in which the output value increases. In FIG. 4, the range in which the ambient temperature Ta is 70 to 200 ° C. generally corresponds to the region where the burner 2 is combusting, and the range in which the ambient temperature Ta is 70 ° C. or less substantially stops the combustion of the burner 2. Corresponds to the area.

When the atmospheric temperature Ta is fixed to a predetermined temperature (for example, Ta1), the output value Vs of the CO sensor S and the CO concentration D have a relationship as shown by the following equation. As shown in FIG. The output value Vs increases as the CO concentration D increases.
Vs = α × D + β
However, α is the sensitivity of the CO sensor S, and β is a value corresponding to the zero point output value Vc when the CO concentration D is predicted to be zero when the ambient temperature Ta is a predetermined temperature.

  Then, based on the output value Vs as the detection value of the unburned component detection unit Sa and the detection value of the temperature sensor 25, CO as unburned component concentration calculating means for obtaining the unburned component concentration in the combustion gas of the burner. A density calculation unit 101 is provided. The CO concentration calculation unit 101 is configured using a control unit H as will be described later.

Hereinafter, the configuration of the control unit H will be described.
The control unit H includes a microcomputer, and as shown in FIG. 1, the combustion control unit 102 as combustion control means for controlling the combustion operation of the burner 2 and the ventilation operation of the fan 4, and the energized state of the CO sensor S Sensor control unit 100 for controlling the unburned component concentration calculating means for determining the CO concentration D in the combustion gas of the burner based on the detected value of the unburned component detecting unit Sa in the CO sensor S and the detected value of the temperature sensor 25 CO concentration calculation unit 101 as a non-combustion determination unit that determines that the incomplete combustion state is present when the CO concentration D obtained by the CO concentration calculation unit 101 is higher than a preset upper limit concentration. The complete combustion determination unit 103 is an abnormality determination unit that determines whether or not the detected value of the temperature sensor 25 during combustion of the burner 2 is an abnormal state that does not correspond to the combustion of the burner 2. The abnormality judgment unit 104, and a like a storage unit 105 in a nonvolatile memory for storing information for various controls.

  In the storage unit 105, the zero point output value Vc of the CO sensor S in a state where the CO concentration D when the CO sensor S is not deteriorated (such as at the time of shipment) is predicted to be zero is set to the ambient temperature Ta. In an associated state, that is, output value data as indicated by a solid line L1 in FIG. 4 is stored in the form of map data.

The CO concentration calculation unit 101 will be described.
The CO concentration calculation unit 101 calculates the CO concentration D based on the output value Vs of the CO sensor S and the following relational expression.
Vs = α × D + β
As described above, since β varies depending on the ambient temperature Ta, β, that is, the zero point output value Vc is corrected based on the map data information shown in FIG. 4 based on the detection result of the temperature sensor 25. Thus, the CO concentration D is calculated from the above relational expression.
Accordingly, the CO concentration calculation unit 101 is configured to obtain the CO concentration D in the combustion gas of the burner 2 based on the detection value of the unburned component detection unit Sa and the detection value of the temperature sensor 25 in the CO sensor S. Yes.

Next, the incomplete combustion determination unit 103 will be described.
The incomplete combustion determination unit 103 determines that the incomplete combustion state occurs when the state in which the CO concentration D obtained by the CO concentration calculation unit 101 is higher than the set upper limit value Kmax continues for a set time (for example, 20 seconds) for concentration abnormality determination. If the incomplete combustion state is determined, the combustion of the burner 2 is stopped and the combustion abnormality notification lamp 18 is turned on. Note that the set upper limit Kmax as described above is preset and stored in the storage unit 105.

  Immediately after the start of combustion of the burner 2, a transient incomplete combustion state occurs in the combustion of the burner 2, and the CO concentration D temporarily increases, so that the transient incomplete combustion state immediately after the start of combustion is not discriminated. As described above, the incomplete combustion determination unit 103 is configured not to execute the incomplete combustion determination process while a set time for standby (for example, 60 seconds) elapses from the start of combustion of the burner 2.

Next, the abnormality determination unit 104 will be described.
In the abnormality determination unit 104, the amount of increase in the ambient temperature detected by the temperature sensor 25 from the start of combustion of the burner 2 until the set time for abnormality determination (for example, 10 seconds) elapses is smaller than the set amount. A state is determined to be the abnormal state.

  When the abnormality determination unit 104 determines that the abnormal state is present, the abnormality determination unit 104 is configured to execute a notification process for lighting the abnormal state notification lamp 19 as a notification unit, and further determines that the abnormality state is present. Then, the combustion of the burner 2 is stopped, and the subsequent ignition process of the burner 2 is prohibited.

Next, the combustion control unit 102 will be described.
When the water supply amount adjusted by the hot water tap and detected by the water supply amount sensor 9 reaches the set water amount, the combustion control unit 102 opens the electromagnetic proportional valve 11 and the on-off valve 12 and operates the igniter 13 to ignite the burner 2. When the ignition of the burner 2 is detected by the frame rod 14, the hot water temperature detected by the hot water temperature sensor 10 becomes the set target hot water temperature set by the temperature setting switch 16. The fan 4 is controlled so that the fuel supply amount corresponding to the combustion amount of the burner 2 is adjusted by controlling the electromagnetic proportional valve 11 and the rotational speed of the fan 4 becomes a target rotational speed set in advance according to the fuel supply amount. When the amount of water supply detected by the water supply amount sensor 9 is less than the set water amount, the electromagnetic proportional valve 11 and the on-off valve 12 are closed. To is configured to perform the extinguishing process of stopping the stops and the combustion stop after post-purge setting period (eg 5 minutes) has passed the fan 4 a combustion burner 2.

  The combustion control unit 102 is configured to turn on the combustion abnormality notification lamp 18 when the ignition of the burner 2 is not detected by the frame rod 14 after the ignition process is executed.

Hereinafter, the control operation in the control unit H will be described based on the flowchart shown in FIG.
When the operation switch 15 is turned on, the control operation is started, the energization to the CO sensor S is started (step 1), and the water supply amount detected by the water supply amount sensor 9 is greater than or equal to the set water amount. When the start of combustion is commanded, the ignition process is executed, and when the ignition of the burner 2 is detected by the frame rod 14, the combustion amount adjusting process is executed (steps 2, 3, and 4).

  After the set time for standby has elapsed since the burner 2 ignited and started combustion, the calculation formula as described above, map data stored in the storage unit 105 as shown in FIG. Based on information such as the output value Vs in S and the detected value of the temperature sensor 25, the CO concentration in the combustion gas is obtained by calculation (steps 5, 6, and 7), and the CO concentration D thus obtained is set. Whether or not the state is higher than the upper limit value Kmax continues for a set time (for example, 20 seconds) for determining the concentration abnormality (step 8).

  When the set time for standby has not elapsed since the burner 2 ignited and started combustion, or when it is determined that the incomplete combustion state has not occurred even if the set time for standby has elapsed, the burner After the set time for abnormality determination (for example, 10 seconds) elapses after the start of combustion of No. 2, the temperature sensor 25 is in the interval from the start of combustion of the burner 2 until the set time for abnormality determination elapses. If the amount of increase in the ambient temperature of the unburned component detection unit Sa detected in this way is smaller than the set amount, an abnormality determination process for determining an abnormal state is executed (steps 9 and 10). At this time, when the increase amount of the ambient temperature is larger than the set amount and the ambient temperature of the unburned component detection unit Sa is greatly increased, it is determined that there is no abnormal state.

  If it is determined in step 10 that there is no abnormal condition, it is determined whether or not a combustion stop command is instructed when the water supply amount detected by the water supply amount sensor 9 falls below the set water amount, and the combustion stop command is instructed. If so, the fire extinguishing process is executed to stop the combustion of the burner 2 (steps 11 and 12). If the combustion stop command is not instructed, steps 5 to 10 are repeatedly executed.

  When the fire extinguishing process is executed and no combustion start command is issued in step 2, it is determined whether or not the operation switch 17 is turned off in step, and when the operation switch 17 is turned off, the CO sensor S is turned on. Is stopped and the control operation is terminated (steps 17 and 18).

  When the ignition of the burner 2 is not detected in step 4, when it is determined in step 8 that it is in an incomplete combustion state, and when it is determined in step 10 that it is in an abnormal state, the fire extinguishing process and After the abnormality notification process is executed and the energization to the CO sensor S is stopped, the combustion operation of the burner 2 is prohibited until there is a reset operation such as an OFF operation of the operation switch 15 (steps 13 to 16).

  When the ignition of the burner 2 is not detected in step 4 and when it is determined that the incomplete combustion state is in step 8, the combustion abnormality notification lamp 18 is turned on in the abnormality notification process of step 14. If it is determined in step 10 that the state is abnormal, the detected abnormality notification lamp 19 is turned on in the abnormality notification process in step 14.

  The set time for determining the abnormality is not limited to 30 seconds, but may be set longer or shorter than that. In short, the combustion gas of the burner 2 is allowed to flow. Thus, the time when the ambient temperature of the CO sensor S is assumed to rise is set.

  According to the above configuration, the temperature sensor 25 as a temperature detection unit originally provided in the CO sensor S can be effectively used to appropriately detect the unburned component concentration in the combustion gas without causing the structure to be complicated. Therefore, it is possible to detect that the abnormal state is not possible.

[Second Embodiment]
Next, a second embodiment of the combustion apparatus according to the present invention will be described.
In the second embodiment, the abnormality determining means is configured to determine that the detected value of the temperature detecting unit is lower than a set temperature during combustion of the burner as the abnormal state.

Hereinafter, the control operation in the control unit H will be described based on the flowchart shown in FIG.
The flowchart shown in FIG. 7 is the same as the flowchart of FIG. 6 described in the first embodiment except that the control operation of the abnormality determination process in step 9a is different. Explanation will be omitted for the same steps as in the first embodiment.

  That is, in step 9a, the detected value detected by the temperature sensor 25 is determined to be abnormal in a state where it is assumed that the combustion state has stabilized after the set time for standby has elapsed since the burner 2 started combustion. When the temperature is lower than the preset temperature (for example, 60 ° C.), that is, the state does not correspond to the combustion of the burner 2, it is determined that the state is abnormal. The preset temperature is not limited to 60 ° C. and can be implemented in various ways.

[Another embodiment]
Hereinafter, other embodiments are listed.

(1) In the first embodiment, the abnormality determination process is executed only when the set time for abnormality determination has elapsed since the start of combustion of the burner. In addition to such a configuration, The abnormality determination process executed in the second embodiment, that is, detected by the temperature sensor in a state in which the combustion state is assumed to have stabilized after the set time for standby has elapsed since the burner started combustion. It may be configured to execute a process for determining that the detected value is an abnormal state when the detected value is equal to or lower than the set temperature.

(2) In each of the above embodiments, the burner is determined to be in an incomplete combustion state when the unburned component concentration calculated by the unburned component concentration calculating means is higher than the set upper limit concentration. The configuration is not limited to such a configuration, and may be used as information for combustion control, for example, adjusting the combustion state of the burner to an appropriate state based on the detection information of the unburned component concentration.

(3) In each of the above embodiments, as an example of the unburned component detection means, a case where a contact combustion type CO sensor that detects the CO concentration as the unburned component concentration in the combustion gas is applied is exemplified. Various types of CO concentration detectors such as an electrolyte type can be used. In addition, as the unburned component detection means, for example, a hydrogen sensor that detects the hydrogen concentration as the unburned component concentration in the combustion gas can be applied.

(4) In each of the above embodiments, an example applied to a hot water supply device that merely supplies hot water to a hot water tap as an example of a combustion device has been illustrated. For example, hot water is circulated and supplied to a floor heating device or a bathroom heating drying device. The hot water supply apparatus comprised so that it may be sufficient, and it can apply also to combustion apparatuses other than hot water supply apparatuses, such as a fan heater.

Schematic configuration diagram of a hot water supply device Cross section of CO sensor Circuit diagram of CO sensor The figure which shows the zero concentration output value with respect to the atmospheric temperature of CO sensor The figure which shows the output value of the CO sensor with respect to CO concentration Flow chart showing the control operation of the control unit Flow chart showing the control operation of the control unit

Explanation of symbols

2 Burner 25 Temperature detection unit 101 Unburned component concentration calculation unit 104 Abnormality determination unit S Unburned component detection unit Sa Unburned component detection unit

Claims (5)

An unburned component detector that outputs a detected value corresponding to the unburned component concentration in the burner combustion gas and a temperature detector that outputs a detected value corresponding to the ambient temperature of the unburned component detector are integrated. Unburned component detection means configured to be incorporated;
Unburned component concentration calculating means for obtaining the unburned component concentration in the combustion gas of the burner based on the detected value of the unburned component detecting unit and the detected value of the temperature detecting unit in the unburned component detecting unit; A combustion device provided;
The combustion apparatus provided with the abnormality determination means which determines whether the detected value of the said temperature detection part during combustion of the said burner is an abnormal state which does not respond | correspond to the combustion of the said burner.   The abnormality determining means is configured to determine that the state in which the amount of increase in the detected value of the temperature detection unit from the start of combustion of the burner until the set time elapses is smaller than the set amount is the abnormal state. The combustion apparatus according to claim 1.   The combustion apparatus according to claim 1 or 2, wherein the abnormality determination unit is configured to determine that the detected value of the temperature detection unit is lower than a set temperature during combustion of the burner as the abnormal state. .   The combustion apparatus according to any one of claims 1 to 3, wherein when the abnormality determination unit determines that the abnormality state is present, a notification process for operating the notification unit is performed.   The said abnormality determination means is comprised so that the combustion of the said burner may be stopped and the ignition process of the said burner after that may be prohibited if it determines with being the said abnormal state. The combustion apparatus according to the item.

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