JPH08110044A - Unburnt component concentration detector of combustion device - Google Patents

Abstract

PURPOSE: To provide an unburnt composition concentration detection device for a combustion device which is capable of detecting the concentration of unburnt component with high accuracy and preventing the durability of an unburnt component detection means from being deteriorated. CONSTITUTION: The present invention relates to an unburnt component concentration detection means which is provided with a CO sensor 17 which detects the concentration of unburnt components contained in combustion exhaust gas passing through an exhaust passage L of a burner 3. The CO sensor 17 is provided with an exhaust gas flowing state change-over means B capable of changing over an exhaust state of a combustion gas from its flowing state to its non-flowing state and an operating state determination means 101 which determines whether or not the exhaust gas flowing state change-over means B executes properly its change-over function which changes over the operation from an exhaust air flowing state of combustion gas to a non-flowing state and a post treatment execution means 102 which executes a post treatment, if it is determined that the operating state determination means 101 fails to its proper change-over function, as an abnormal state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unburned component concentration of a combustion device equipped with an unburned component concentration detecting means for detecting the concentration of unburned component contained in a combustion exhaust gas passing through an exhaust passage of a burner. Regarding a detection device.

[0002]

2. Description of the Related Art An unburned component concentration detecting device for a combustion apparatus having the above structure detects the unburned component concentration in the combustion exhaust gas by the unburned component concentration detecting means, and the detected value is set in advance, for example. If it exceeds the upper limit, it is judged that the burner is incompletely burned, and by taking measures such as stopping the burner combustion and activating the alarm means, the state where the unburned component concentration is high becomes long. This is so that it can be prevented from continuing.

By the way, conventionally, in order to effectively detect the concentration of unburned gas contained in the combustion exhaust gas, the combustion exhaust gas is always made to flow to the unburned gas concentration detection means during combustion of the burner. Was there.

[0004]

Generally, combustion exhaust gas from a burner contains harmful substances such as sulfur components, and such harmful substances are solidified to detect unburned gas concentration. There is a risk of adverse effects such as adhesion to the surface of the means or progress of corrosion.

However, in the above-mentioned conventional structure, the combustion exhaust gas always flows to the unburned gas concentration detecting means while the burner is burning, so that the unburned component concentration is adversely affected by the harmful substances as described above. There is a great possibility that the durability of the detection means will be reduced, and there is room for improvement in this respect.

Therefore, as a method of eliminating the above disadvantage, when the detection operation by the unburned component concentration detecting means is executed, the combustion exhaust gas is made to flow toward the unburned component concentration detecting means and detected. When the operation is not executed, it is conceivable that the combustion exhaust gas does not flow to the unburned component concentration detecting means.However, in such a configuration, the switching means for switching the flow state of the combustion exhaust gas is long-term. There are cases in which it does not operate smoothly due to the use of, or when it does not operate smoothly due to clogging due to harmful components in the combustion exhaust gas. Then, there is a possibility that the initial purpose of accurately detecting the unburned component concentration and preventing the deterioration of the durability of the unburned component concentration detection means cannot be achieved.

The present invention has been made by paying attention to such a point, and an object thereof is to accurately detect the unburned component concentration and to reduce the durability of the unburned component concentration detecting means. It is an object of the present invention to provide an unburned component concentration detection device for a combustion device capable of reliably preventing the above.

[0008]

The features of the first invention are as follows:
In an unburned component concentration detection device of a combustion device, which is provided with unburned component concentration detection means for detecting the concentration of unburned component contained in the combustion exhaust gas passing through the exhaust passage of the burner, the unburned component concentration detection means On the other hand, an exhaust gas flow state switching means capable of switching between the exhaust gas flow state in which the combustion exhaust gas flows and a non-flowing non-flow state, and the exhaust gas flow state and the non-flow state by the exhaust gas flow state switching means The operation state determination means for determining whether or not the switching operation is normally performed, and the operation state determination means,
When it is determined that the switching operation is not normally performed, it is determined that an abnormal state is present, and a post-processing executing unit that executes the post-processing is provided.

The characteristic configuration of the second aspect of the invention specifies a configuration suitable for carrying out the first aspect of the invention, wherein the exhaust gas flow state switching means, in the non-flow state, is a wind generated by a blower source. Is ventilated through an air guide passage, and the combustion exhaust gas is switched to an air blowing state that prevents the unburned component concentration detecting means from flowing, and in the exhaust gas flowing state, the air generated by the air blowing source is introduced. It is configured such that the combustion exhaust gas is switched to a blow-off stopped state that allows the unburned component concentration detection means to flow without being ventilated through the air passage, and the operation state determination means is provided in the air guide passage. The point is that the pressure is detected, and whether or not the switching operation is normally performed is determined based on the detected pressure.

A characteristic configuration of the third invention is to specify a configuration suitable for carrying out the second invention, wherein the air guide passage is provided in a state of communicating with the exhaust passage, and the exhaust gas flow state switching is performed. An open state in which the means allows air to be guided through the air guide path at a location near the air source in the air guide path,
It is configured to include an air passage opening / closing means that can be switched to a closed state in which the air passage is shut off and the air guide is stopped, and the operation state determination means has the guiding means on the lower side in the air guiding direction than the air passage opening / closing means. If the detected pressure exceeds the reference upper limit value in a state in which the pressure in the air passage is detected and the air passage opening / closing means is switched to the open state, the switching operation is normally performed. If it is determined that it has not been executed, and if the detected pressure is below the reference lower limit value with the air passage opening / closing means switched to the closed state, the switching operation has not been executed normally. It is configured so that it can be determined.

According to a fourth aspect of the present invention, a configuration suitable for carrying out the first, second or third aspect of the invention is specified, wherein the post-processing executing means performs the post-processing as the combustion of the burner. Is configured to stop.

A characteristic configuration of the fifth aspect of the invention is to specify a configuration suitable for carrying out the first, second or third aspect of the invention, wherein the post-processing executing means activates an alarm means as the post-processing. It is configured to let.

The characteristic features of the sixth invention are the second, third and fourth aspects.
Or, a configuration suitable for carrying out the fifth aspect of the invention is specified, in which the air blowing source is a fan that ventilates combustion air to the burner, and a part of the combustion air is introduced into the wind guide. It is configured to ventilate through the road.

[0014]

According to the characterizing feature of the first aspect of the present invention, the unburned component concentration in the combustion exhaust gas can be effectively detected by switching the exhaust gas flow state switching means to the exhaust gas flow state.
Further, even when the burner is burning, for example, when the unburned component concentration is not detected, the exhaust gas flow state switching means is switched to the non-flow state so that the unburned component concentration detection means Can be set in a non-flowing state.

Therefore, the combustion exhaust gas does not flow to the unburned component concentration detecting means even when the burner is burning, as compared with the conventional structure in which the combustion exhaust gas always flows to the unburned component concentration detecting means during combustion of the burner. It can be set to a state, and due to harmful substances in the combustion exhaust gas, for example, it solidifies and adheres to the surface of the unburned component concentration detection means, lowering the unburned component concentration detection function, or promoting corrosion. It is possible to reduce the adverse effects such as being caused.

Further, when the operating state determination means determines that the exhaust gas flow state switching means is not normally performing the switching operation, the post-processing is executed as an abnormal state.

For example, if the switching operation to the non-flowing state is not normally executed, it is an abnormal state in which the adverse effect of harmful substances on the unburned component concentration detecting means cannot be reduced, and the switching operation to the exhaust gas flowing state is performed. If it is not executed normally, it will be in an abnormal state where the detection of the unburned component concentration cannot be performed effectively. In such a case, for example, post-processing such as alarm activation and burner combustion termination operation is executed. Therefore, the detection operation of the unburned component concentration in the abnormal state will not be erroneously continued.

According to the characterizing structure of the second invention, the following function is provided in addition to the function of the characterizing structure of the first invention. It will be switched to a non-flowing state by ventilating through the air duct, and switched to the exhaust gas flowing state by stopping ventilation, detecting the pressure in the air duct, and based on the detected pressure, It will be determined whether or not the switching operation is normally executed.

For example, the inside of the air guide passage is clogged with dust or the like, or a cutout occurs in a part of the air guide passage, and the air ventilated from the air supply source escapes to the outside and cannot be normally switched to the non-flowing state. In some cases, the pressure in the air guide passage becomes an abnormal value, so that these abnormal states can be detected.

According to the characterizing structure of the third invention, the following function is provided in addition to the function of the characterizing structure of the second invention. When the air passage opening / closing means is switched to the open state, the wind from the air source is guided through the air guide passage. Therefore, if the switching operation is normal, the air guide on the lower side of the air passage direction from the air passage opening / closing means is introduced. The pressure in the passage becomes a value lower than the reference upper limit value due to the flow of wind, but if this pressure exceeds the reference upper limit value, for example,
It is possible to determine that an abnormality such as clogging in the air guide passage has occurred.

When the air passage opening / closing means is switched to the closed state, the wind from the air source is shut off. Therefore, if the switching operation is normal, the inside of the air guide passage on the lower side in the air guiding direction from the air passage opening / closing means. The pressure becomes higher than the reference lower limit value due to the internal pressure in the exhaust passage communicating with the air guide passage.If this pressure is below the reference lower limit value, for example, a notch may be formed in the middle of the air guide passage. It is possible to determine that there is an abnormality such as (small holes, cracks, etc.) occurring and the wind is leaking outward.

According to the characteristic configuration of the fourth invention, the first and second
Alternatively, the following operation is provided in addition to the operation according to the characteristic configuration of the third invention. When it is determined that the switching operation as described above is not normally performed, the combustion of the burner is stopped, so that the combustion of the burner continues in an abnormal state and the concentration of unburned components in the air increases. Can be prevented.

According to the characteristic configuration of the fifth invention, the first and second
Alternatively, the following operation is provided in addition to the operation according to the characteristic configuration of the third invention. When it is determined that the switching operation is not normally performed, the alarm means is activated, so that the user can quickly know that an abnormality has occurred, and it is possible to take subsequent measures. .

According to the characterizing feature of the sixth invention, there is the following effect in addition to the effect of the characterizing feature of the second, third, fourth or fifth invention. Part of the combustion air that is ventilated by the fan to the burner is used to ventilate the air through the air duct to switch the exhaust gas flow state, so there is no need for a dedicated air source and there is no need to complicate the configuration. .

[0025]

According to the characteristic constitution of the first invention, although the unburned gas concentration can be effectively detected, the combustion exhaust gas is emitted to the unburned gas concentration detection means even during the combustion of the burner. It is possible to set in a non-flowing state, and it is possible to reduce the above-mentioned adverse effects of the harmful substances in the combustion exhaust gas and improve the durability of the unburned gas concentration detection means. Moreover, when the switching operation of the exhaust gas flow state is not normally performed, the post-processing is executed, the abnormal state continues, the detection function of the unburned component concentration detection unit is lowered, and the unburned component concentration is detected. It is possible to avoid disadvantages such as erroneous detection.

According to the characterizing feature of the second invention, the following effect is obtained in addition to the effect of the characterizing feature of the first invention. Switching between the exhaust gas flow state and the non-flow state may be performed, for example, by changing the posture of a movable member such as a shielding member that blocks the flow of combustion exhaust gas, but in this case, abrasion of the movable member at the support portion occurs. However, the exhaust gas flow state and the non-flow state are switched based on the switching of the blowing state, so that mechanical change is possible compared to the case where the posture of the movable member is changed. The decrease in durability due to wear or the like is reduced. Further, based on the pressure in the air guide passage, it is possible to easily determine whether or not the air guide state is normal, that is, whether or not the switching operation is normally executed.

According to the characterizing structure of the third invention, the following effect is obtained in addition to the effect of the characterizing structure of the second invention. It is possible to effectively detect not only the clogging abnormality in the air guide passage but also the abnormality such as the escape of the wind due to the notch.

According to the characteristic configuration of the fourth invention, the first and second
Alternatively, there are the following effects in addition to the effects of the characteristic configuration of the third invention. It is possible to avoid the disadvantage that the combustion device is continuously used in an abnormal state and the concentration of unburned components in the air becomes high, and safety in use can be secured.

According to the characteristic configuration of the fifth invention, the first and second
Alternatively, there are the following effects in addition to the effects of the characteristic configuration of the third invention. When an abnormal condition occurs, the subsequent measures can be taken quickly.

According to the characterizing structure of the sixth invention, the following effects are obtained in addition to the effects of the characterizing structure of the second, third, fourth or fifth invention. The configuration can be simplified by sharing the device.

[0031]

Embodiments will be described below with reference to the drawings. FIG.
FIG. 1 shows a hot water supply device as an example of the combustion device according to the present invention. This hot water supply device includes a hot water supply unit A, a control unit H as a control unit that controls the operation of the hot water supply unit A, and a remote control device R that issues control information to the control unit H.

The hot water supply unit A is provided with a heat exchanger 2 for heating water and a burner 3 for heating the heat exchanger 2 in the combustion chamber 1, and the burner 3 burns in the combustion chamber 1. Ventilation air is passed and the combustion exhaust gas from the burner 3 is transferred to the combustion chamber 1
A fan 5 is provided as a ventilating means for exhausting the air through the exhaust pipe 4 to the outside of the room. On the upper side of the burner 3 in the ventilation path in the combustion chamber 1, a wind regulating plate 6 made of a perforated plate is provided.
Is provided, and the wind generated by the fan 5 is configured to be substantially evenly passed through the burner 3.

Further, the heat exchanger 2 is connected to a water supply passage 7 for supplying water and a hot water supply passage 8 for supplying heated hot water to a hot water tap (not shown). An inlet water temperature sensor 9 for detecting the inlet water temperature to the heat exchanger 2 and a water amount sensor 10 for detecting the amount of water supplied to the heat exchanger 2 are provided, and a hot water outlet 8 for detecting the outlet water temperature of the heat exchanger 2 is provided in the hot water supply passage 8. A temperature sensor 11 is provided.

The fuel gas supply passage 12 for the burner 3 is provided with an opening / closing valve 13 for connecting and disconnecting the fuel gas supply and an electromagnetic gas amount adjusting valve 14 for adjusting the fuel gas supply amount.
An igniter 15 for ignition and a frame rod 16 for detecting whether or not the burner 3 has ignited are provided near the burner 3.

Further, in the exhaust passage L through which the combustion exhaust gas of the burner 3 passes, the concentration (CO concentration) of carbon monoxide (CO) as an unburned component contained in the combustion exhaust gas is detected. A catalytic combustion type CO sensor 17 is provided as a means. The CO sensor 17 has an exhaust passage L through the opening 18 in the exhaust passage L through which the combustion exhaust gas passes.
It is installed inside the box body 19 which is partially opened so as to communicate with. A guide plate 20 for effectively guiding the combustion exhaust gas flowing upward to the inside of the box body 19 is provided at a position close to the opening 18 of the exhaust path L.

Further, a part of the wind generated by the fan 5 as a blower source is CO 2 in a state where the upstream side of the air conditioning plate 6 and the inside of the box body 19, that is, the exhaust path are in communication with each other. An air guide 21 is formed near the sensor 17,
At a position near the fan 5 in the air guide path 21, there are a valve open state that allows wind to be guided into the box body 19 and a valve closed state that shuts off the air guide path 21 to stop the air guide. Electromagnetically operated air passage opening / closing valve 2 as switchable air passage opening / closing means 2
2 is provided. When the wind is introduced into the box body 19, the combustion exhaust gas cannot flow into the box body, and when the wind guide is stopped, the combustion exhaust gas flows into the box body and circulates,
It is possible to measure the concentration.

Therefore, the exhaust gas flow state switching which enables the CO sensor 17 to be switched between the exhaust gas flow state in which the combustion exhaust gas flows and the non-flow state in which the combustion exhaust gas does not flow by the air guide passage 21 and the air passage opening / closing valve 22. Means B will be configured.

A pressure sensor 29 for detecting the pressure in the air guide passage 21 on the lower side of the air passage opening / closing valve 22 in the air guide direction.
Is provided. The pressure sensor 29 is provided in the air guide passage 21.
The pressure sensor 29 is configured to be turned on when the internal pressure exceeds a set value for determination and turned off when the internal pressure falls below the set value. The output of the pressure sensor 29 is input to the control unit H.

The remote control device R has an operation switch 23 for instructing start / stop of operation, a temperature display section 24 for displaying the hot water supply temperature, and a temperature setting switch 2 for setting a target hot water supply temperature.
5, an operation lamp 26 that displays whether or not the vehicle is in an operating state, an abnormality display lamp 27 that is an example of alarm means that lights up when an abnormal state described later occurs, and the like.

The control unit H includes the sensors 9, 10, 11 described above.
Based on the detection information of the flame rod 16 and the flame rod 16, the gas amount control valve 1 is controlled so that the combustion of the burner 3 becomes a proper combustion state.
4, based on the detection information of the combustion control means 100 for controlling the fan 5 and the like, and the pressure sensor 29, it is determined whether or not the above-described switching operation to the exhaust gas flowing state or the non-flowing state is normally executed. When the operation state determination unit 101 and the operation state determination unit 101 determine that the switching operation is not normally executed, it is determined that the state is abnormal.
The post-processing includes a post-processing executing unit 102 that executes a combustion stop operation of the burner 3 and an operation of lighting the abnormality display lamp 27 as post-processing.

The control operation of the controller H will be described below with reference to the control flowchart shown in FIG. When it is determined that the hot water tap has been opened because the detection value of the water amount sensor 10 exceeds the set value after the operation switch 23 is turned on, the ventilation operation of the fan 5 is started and the CO sensor 17 is operated. Start energization (Step 1
4). After the air passage opening / closing valve 22 is opened (step 5), the ignition control for the burner 3 is executed (step 6). That is, when the igniter 15 ignites the burner 3 and the flame rod 16 confirms ignition, the ignition operation is stopped.

At this time, the air passage opening / closing valve 22 is open, and a part of the wind generated by the fan 5 is part of the air guide passage 2.
Since it is guided into the box body 19 through 1, the combustion exhaust gas of the burner 3 cannot flow into the box body 19, and the combustion exhaust gas is suppressed from flowing to the CO sensor 17.

When combustion is started, combustion control is executed to control the burner 3 to an appropriate combustion state so that the hot water supply temperature becomes the target hot water supply temperature (step 7). That is, the feedforward operation amount is determined based on the deviation between the target hot water supply temperature set by the temperature setting switch 25 and the incoming water temperature detected by the incoming water temperature sensor 9, and the amount of water supplied by the water amount sensor 10. Along with the calculation, the feedback operation amount is obtained based on the deviation between the target hot water supply temperature and the detected value of the hot water temperature sensor 11, and the gas amount control valve 14 is operated and controlled based on the added value of each operation amount to control the gas amount. In addition, the number of rotations of the fan 5 is controlled so that the amount of ventilation is suitable for the amount of gas.

If the CO concentration measuring flag by the CO sensor 17 is ON, the air passage opening / closing valve 2 is closed to stop the air blowing through the air guide passage 21 (steps 8 and 9). By closing the air passage opening / closing valve 22,
Since the air guide state into the box body 19 is stopped, the combustion exhaust gas passing through the exhaust passage L flows into the box body 19 and flows toward the CO sensor 17, and the CO sensor 17
The CO concentration can be measured by.

The measurement flag is automatically set to the ON state each time a predetermined time (for example, several minutes to 10 minutes) elapses while the driving operation is started. ing.

From the time when the air passage opening / closing valve 22 is closed, the first set time T ₁ which is the time required for the combustion exhaust gas in the box body 19 to be sufficiently mixed has elapsed, and the air passage 21 If the pressure sensor 29 is turned off after the second set time T ₂ that is the time required for the pressure of the pressure sensor to stabilize is set, that is, the set value for determination of the pressure sensor 29 (reference lower limit value)
If it is less than, it is determined that there is an abnormality, and the abnormality display lamp 27 is turned on and the combustion of the burner 3 is stopped (steps 10 to 14). That is, if the air passage opening / closing valve 22 is closed and the operation is normal, the pressure in the exhaust passage L of the water heater is transmitted through the air guide passage 21, so that the pressure sensor 29 is switched to the ON state. Of course, OF
When the F state is detected, the pressure in the exhaust passage L is not transmitted to the pressure sensor 29, and a cutout (a hole, a crack, etc.) occurs in the air guide passage 21, and the exhaust gas leaks to the outside. Since it is possible that it has been output, the post-processing for abnormality is executed. In such a case, the combustion exhaust gas does not circulate in the box body 19 but flows in a short circuit from the air guide passage 21 and leaks to the outside. In addition, the air duct 2
Even when air is blown through 1, the air does not smoothly flow into the box body 19.

In step 12, the pressure sensor 29
Is ON (the detected pressure exceeds the set value for discrimination of the pressure sensor 29), the CO concentration measurement by the CO sensor 17 is executed (step 15). When the concentration measurement is completed, the measurement flag is set to OFF.

When the CO concentration measurement by the CO sensor 17 is completed, the air passage opening / closing valve 22 is opened to guide the wind into the box body 19 and the combustion sensor is switched to a non-flowing state in which the combustion exhaust gas does not flow. (Step 16). Then, from the time when the air passage opening / closing valve 22 is opened, the air guide passage 21
If the pressure sensor 29 is turned on after the third set time T ₃ required for the internal pressure to stabilize is exceeded, that is, if the set value (reference upper limit value) for the determination of the pressure sensor 29 is exceeded. It is determined that there is an abnormality, the abnormality display lamp 27 is turned on, and the combustion of the burner 3 is stopped (steps 17 to 20). That is, if the operation is normal with the air passage opening / closing valve 22 open, the pressure is low because the wind is flowing through the air guide passage 21, and the pressure sensor 29 is off.
Although it will be switched to the state, when the ON state is detected, it is conceivable that the air guide path 21 is clogged with dust or the like, or it is bent so that the air cannot be effectively sent. The post-processing for abnormality is executed. In such a case, the box body 19 is passed through the air guide passage 21.
The air cannot be blown into the chamber, and the combustion exhaust gas cannot be switched to the non-flowing state.

When the operation is normal and the detected value of the water amount sensor 10 falls below the set value due to the closing operation of the hot water tap, the fuel supply to the burner 3 is stopped, the combustion is stopped, and the post purge is performed. After the execution, the operation of the fan 5 is stopped and the energization of the CO sensor 17 is stopped (steps 21 to 25).

[Other Embodiments] (1) In the above embodiment, the pressure sensor 29 for detecting the pressure in the air guide passage 21 is turned on when the detected pressure exceeds the set value for discrimination, and the set value is changed. An example is shown in which the switch is configured to turn off when it falls below, and the reference lower limit value in step 12 and the reference lower limit value in step 18 are both set values for discrimination. However, the following configuration may be adopted. .

As the pressure sensor, a sensor that outputs an analog signal proportional to the pressure in the air duct is used, and in step 12, the detected pressure is determined in advance according to the fan characteristics, the air duct characteristics of the air duct, and the like. If the detected pressure is below the predetermined reference lower limit value, abnormal processing is executed. In step 18, if the detected pressure exceeds the predetermined reference upper limit value determined by the characteristics of the fan, the air duct characteristics of the air guide passage, etc., the abnormal processing is executed. It may be configured to run.

(2) In the above embodiment, the exhaust gas flow state switching means B is the air passage opening / closing valve 22 for opening and closing the air guide passage 21.
However, the present invention is not limited to such a configuration, and for example, a dedicated blower fan capable of ON / OFF switching is used as a blower source, and this blower fan is turned ON / O.
A configuration may be used in which the exhaust gas flow state is switched by FF control.

(3) In the above embodiment, the case where the exhaust gas flow state switching means B switches between the state in which the air is blown into the box 19 and the state in which the air is stopped is exemplified.
The present invention is not limited to this, and it may be configured to set the non-flowing state by blowing air around the CO sensor 17 and set the exhaust gas flowing state by switching the blowing direction. Also, the exhaust gas flow state switching means,
As shown in FIG. 3, a state in which the exhaust passage L and the inside of the box body 19 are communicated with each other, instead of the configuration in which the blowing state is switched (a)
And a state in which the inside of the box body 19 and the outside of the apparatus are communicated with each other while shielding the exhaust path L and the inside of the box body 19 from each other, a switching plate 28 that is switched and operated is provided, and an actuator (not shown) is provided. By rotating the switching plate 28,
It may be configured to switch between the exhaust gas flowing state and the non-flowing state, and as a configuration for determining whether or not the switching operation is normally performed, as shown in FIG.
ON when is normally switched to any of the above states
Alternatively, the limit switches 30a and 30b may be used.

(4) In the above embodiment, the case where post-processing is performed to stop the combustion of the burner and the abnormality indicator lamp is turned on has been illustrated. However, the combustion of the burner is stopped without using the abnormality indicator lamp. Alternatively, the abnormality indicating lamp may be turned on or the alarming means such as an alarm buzzer may be activated without stopping the combustion of the burner.

(5) In the above-described embodiment, the ventilation fan for the combustion air to the burner is also used as the ventilation source for the air guide passage, but a dedicated ventilation means may be used.

(6) In the above embodiment, carbon monoxide (CO) is detected as an example of unburned components in the combustion exhaust gas, but the invention is not limited to this, and other unburned components such as hydrogen are detected. You may do it.

It should be noted that reference numerals are added to the claims for facilitating the comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a hot water supply device.

FIG. 2 is a flowchart of control operation

FIG. 3 is a view showing an exhaust gas flow state switching means of another embodiment.

[Explanation of symbols]

 3 burner 5 blast source 17 unburned component concentration detection means 21 air guide 22 air passage opening / closing means 27 alarm means 101 operating state determination means 102 post-processing execution means B exhaust gas flow state switching means L exhaust passage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiya Shirakura 1-152 Oka, Minami-shi, Minato-ku, Osaka City, Osaka Prefecture Harman Co., Ltd.

Claims (6)

[Claims] 1. An unburned component concentration detecting means (17) for detecting a concentration of an unburned component contained in a combustion exhaust gas passing through an exhaust passage (L) of a burner (3). A device for detecting a concentration of a fuel component, wherein the exhaust gas flow state switching unit (17) is capable of switching between an exhaust gas flow state in which the combustion exhaust gas flows and a non-flow state in which the combustion exhaust gas does not flow ( B)
And an operation state determination means (101) for determining whether or not the switching operation to the exhaust gas flow state or the non-flow state by the exhaust gas flow state switching means (B) is normally executed.
When the operation state determination means (101) determines that the switching operation is not normally performed, post-processing execution means (10) that performs post-processing as an abnormal state is executed.
2) An unburned component concentration detection device for a combustion device, including: 2. The exhaust gas flow state switching means (B), in the non-flow state, causes the air generated by the air blow source (5) to flow through the air guide passage (21), and the combustion exhaust gas is not mixed with the air. It is switched to an air blowing state that prevents the fuel component concentration detecting means (17) from flowing, and in the exhaust gas flowing state, the air generated by the air blowing source (5) is ventilated through the air duct (21). Instead, the combustion exhaust gas is configured to be switched to a blowing stop state that allows the combustion exhaust gas to flow to the unburned component concentration detection means (17), and the operation state determination means (101) 21. The unburned component of the combustion apparatus according to claim 1, wherein the pressure in 21) is detected, and whether or not the switching operation is normally performed is determined based on the detected pressure. Concentration detector . 3. The air guide passage (21) is provided in a state of communicating with the exhaust passage (L), and the exhaust gas flow state switching means (B) is the blower source in the air guide passage (21). An air passage opening / closing means (22) that is switchable between an open state in which a wind passage through the air passage (21) is allowed and a closed state in which the air passage is stopped by stopping the air passage at a location near (5). ), The operation state determination means (101) is configured to detect the pressure in the air guide passage (21) on the lower side in the air guide direction than the air passage opening / closing means (22). If the detected pressure exceeds the reference upper limit value while the air passage opening / closing means (22) is switched to the open state, it is determined that the switching operation is not normally performed, Further, the air passage opening / closing means (22) is switched to the closed state. The unburned component concentration of the combustion apparatus according to claim 2, wherein if the detected pressure is below a reference lower limit value, it is determined that the switching operation is not normally performed. Detection device. 4. The unburned combustion apparatus according to claim 1, 2 or 3, wherein the post-processing executing means (102) is configured to stop combustion of the burner (3) as the post-processing. Component concentration detector. 5. The unburned component concentration of the combustion device according to claim 1, 2 or 3, wherein the post-processing executing means (102) is configured to activate an alarm means (27) as the post-processing. Detection device. 6. The air source (5) is the burner (3).
Combustion according to claim 2, 3, 4, or 5, which is constituted by a fan for ventilating the combustion air for said, and is configured to ventilate a part of said combustion air through said air guide passage (21). Device unburned component concentration detector.