JP5319308B2 - Open combustion equipment - Google Patents

Description

  The present invention relates to a burner that burns supplied fuel, a blower that sucks air through an intake port and exhausts the combustion exhaust gas of the burner from a blowout port, a CO sensor that detects a CO concentration, and the CO sensor The present invention relates to an open-type combustion apparatus provided with burner control means for stopping combustion of the burner when the detected CO concentration becomes equal to or higher than an abnormal threshold value.

As an open-type combustion device, for example, a hot-air heater that heats the space to be heated by supplying air sucked through the intake port as combustion air for the burner and blowing out the air heated by the burner combustion from the blow-out port Etc.
In such an open-type combustion apparatus, it is monitored whether the CO concentration is high due to incomplete combustion of the burner, and if it is determined that the CO concentration is high due to incomplete combustion of the burner, Combustion is stopped.

As a configuration for determining that the CO concentration is high due to incomplete combustion of the burner, for example, in the first conventional configuration, a thermocouple that outputs a higher output value as the temperature of the flame formed by the burner is higher. When the output value of the thermocouple is less than or equal to the abnormal output value, it is determined that the CO concentration is high due to incomplete combustion of the burner.
In the second conventional configuration, a CO sensor that detects the CO concentration is provided in the vicinity of the outlet, and when the detected CO concentration detected by the CO sensor exceeds the abnormal threshold value, the CO concentration increases due to incomplete combustion of the burner. (For example, refer to Patent Document 1).

JP 2008-14551 A

  In the first conventional configuration, when the burner is incompletely combusted, the temperature of the flame at the location measured by the thermocouple is lowered. Therefore, by capturing the temperature drop of the flame with the thermocouple, It is determined that the CO concentration is increased by combustion. However, since the CO concentration is not directly detected by the thermocouple, the relationship between the thermocouple output value and the CO concentration must be set in advance, which may lead to a complicated configuration. is there.

  In the second conventional configuration, since the CO concentration is directly detected by the CO sensor, there is no problem as in the first conventional configuration. However, for example, even when air containing CO such as cigarette smoke is sucked from the intake port, the CO sensor detects the CO. Therefore, it cannot be distinguished whether the CO detected by the CO sensor is generated by incomplete combustion of the burner or caused by other factors, and is not distinguished. Therefore, simply because the detected CO concentration of the CO sensor is equal to or higher than the abnormal threshold, it cannot be said that the CO concentration is increased due to incomplete combustion of the burner. Therefore, even when CO is generated due to factors other than incomplete combustion of the burner, it may be erroneously determined that the CO concentration is high due to incomplete combustion of the burner.

  The present invention has been made paying attention to such a point, and its purpose is to avoid the complication of the burner when CO is generated due to factors other than the incomplete combustion of the burner without causing complication of the configuration. An object of the present invention is to provide an open-type combustion device that can suppress erroneous determination that the CO concentration is high due to complete combustion.

In order to achieve this object, a characteristic configuration of an open combustion apparatus according to the present invention includes a burner that burns supplied fuel, and a blower that sucks air through an intake port and exhausts combustion exhaust gas of the burner from a blowout port. And an open type combustion device provided with a CO sensor for detecting the CO concentration, and a burner control means for stopping combustion of the burner when the detected CO concentration detected by the CO sensor is equal to or higher than an abnormal threshold value,
A thermocouple that outputs a higher output value as the temperature of the flame formed by the burner is higher;
It is determined whether CO is generated due to incomplete combustion of the burner or incomplete combustion CO generated due to factors other than incomplete combustion of the burner. And a CO generation state determining means for providing
When the detected CO concentration increases before the detected CO concentration reaches the abnormal threshold, the CO generation state determining means determines whether the output value of the thermocouple is decreasing or not. If it is a tendency, it is determined that the incomplete combustion CO generation state is present, and if it is not decreasing, it is determined that the non-incomplete combustion CO generation state is detected.

If the burner is incompletely combusted, the temperature of the flame will decrease and the output value of the thermocouple will tend to decrease, but if the burner is not incompletely combusted, the temperature of the flame will not decrease, and the output value of the thermocouple will be No downward trend. Therefore, it can be said that the presence or absence of incomplete combustion of the burner and the tendency of the output value of the thermocouple have a certain relationship.
Therefore, according to this feature configuration, the CO generation state determination means determines whether or not the output value of the thermocouple tends to decrease when the detected CO concentration of the CO sensor increases to a state before reaching the abnormal threshold value. By determining, using the above-described fixed relationship between the presence / absence of incomplete combustion and the trend of the thermocouple output value, if the thermocouple output value tends to decrease, the incomplete combustion CO generation state is assumed. If the thermocouple output value does not tend to decrease, it is determined that the non-incomplete combustion CO is generated.

  From the above, it is not necessary to set the relationship between the output value of the thermocouple and the CO concentration in advance, so CO is generated due to factors other than incomplete combustion of the burner without complicating the configuration. Thus, it is possible to realize an open combustion apparatus that can suppress erroneous determination that the CO concentration is high due to incomplete combustion of the burner.

  According to a further characteristic configuration of the open-type combustion apparatus according to the present invention, when the CO generation state determination unit determines that the incomplete combustion CO generation state is present, the CO generation state determination unit determines that the non-incomplete combustion CO generation state is present. An abnormality threshold setting means for setting the abnormality threshold to a lower value than when it is determined that there is an abnormality is provided.

According to this feature, when the incomplete combustion CO is generated, the combustion of the burner is stopped when the detected CO concentration of the CO sensor reaches an abnormal threshold value lower than that in the non-incomplete combustion CO generation state. Become. As a result, when CO is generated due to incomplete combustion of the burner, combustion of the burner can be stopped immediately and further generation of CO can be prevented.
On the other hand, for example, when CO is generated due to factors other than incomplete combustion of the burner, such as cigarette smoke, the burner is not incompletely combusted. There is no requirement to stop combustion. Therefore, when the non-incomplete combustion CO is generated, combustion of the burner is stopped when the detected CO concentration of the CO sensor reaches an abnormal threshold higher than that in the incomplete combustion CO generation state. Accordingly, it is possible to prevent the combustion of the burner from being stopped even though the combustion of the burner can be continued, and to suppress the deterioration of the user's usability.

  According to a further characteristic configuration of the open-type combustion apparatus according to the present invention, the CO generation state determination unit is configured such that when the output value of the thermocouple becomes equal to or less than the decrease tendency determination value, the output value of the thermocouple is decreasing. The point is that it is configured to discriminate.

  According to this feature configuration, when the burner is incompletely combusted, the decrease tendency determination value can be set in advance by experiments or the like so that the output value of the thermocouple is equal to or less than the decrease tendency determination value. Thereby, the CO generation state determination means can determine whether or not the output value of the thermocouple is in a decreasing tendency by simply comparing the output value of the thermocouple with the decreasing tendency determination value. Therefore, it is possible to accurately and easily determine whether or not the output value of the thermocouple is decreasing.

  According to still another feature of the open-type combustion apparatus according to the present invention, the CO generation state determination unit is configured such that when the degree of decrease per unit time of the output value of the thermocouple is greater than a set decrease degree, the output of the thermocouple The point is that the value is determined to be decreasing.

  According to this characteristic configuration, when the burner is incompletely burned, the output value of the thermocouple decreases with time, so the degree of decrease per unit time of the output value of the thermocouple By monitoring whether or not it is greater than the set reduction degree, it is possible to accurately grasp the change in the output value of the thermocouple caused by incomplete combustion of the burner. Then, when the burner is incompletely combusted, the setting reduction degree can be set in advance by experiments or the like so that the output value of the thermocouple is smaller than the reduction degree per unit time. This makes it possible to accurately and easily determine the tendency of the output value of the thermocouple to decrease due to incomplete combustion of the burner.

  According to a further characteristic configuration of the open-type combustion apparatus according to the present invention, when the CO generation state determination means determines that the incomplete combustion CO generation state is present, a notification operation for incomplete combustion is performed, and the CO generation When the state determination means determines that the non-incomplete combustion CO is generated, a notification means for performing a notification operation for non-incomplete combustion is provided.

  According to this characteristic configuration, depending on whether the notification means performs a notification operation for incomplete combustion or a notification operation for non-complete combustion, the user can determine whether the cause of CO is incomplete combustion of the burner. Can be distinguished from other factors. Therefore, the user can take appropriate measures such as ventilation when CO is generated due to incomplete combustion of the burner, but CO is generated due to factors other than incomplete combustion of the burner. Appropriate measures can be taken corresponding to the situation.

Cross section of gas fan heater Control block diagram of gas fan heater Graph showing change with time of CO concentration detected by CO sensor and output value of thermocouple Flow chart showing control operation of gas fan heater

An embodiment of an open combustion apparatus according to the present invention will be described with reference to the drawings.
In this embodiment, as shown in FIG. 1, the air sucked through the intake port 1 is supplied as combustion air for the burner 2, and the air heated by the combustion of the burner 2 is blown out from the blowout port 3. An open-type combustion device is configured by a gas fan heater that heats the space.

  As shown in FIGS. 1 and 2, the gas fan heater includes a burner 2 that combusts supplied gas fuel, an igniter 4 that ignites the burner 2, and a fuel supply state that supplies gas fuel to the burner 2. A fuel intermittent means 5 that can be switched to a fuel supply stop state in which the supply of gas fuel to the burner 2 is stopped, a blower fan 6 (corresponding to a blower means) that supplies combustion air to the burner 2, and a gas fan heater Are provided with a control unit 7 that controls the operation and an operation unit 8 that commands the control unit 7 with various control commands and the like.

  The burner 2 is housed in a casing 9 having an intake port 1 on the upper side of the back surface and an outlet port 3 on the lower side of the front surface. In the casing 9, a part of the air sucked through the air inlet 1 is supplied to the burner 2 as combustion air, and the remaining part is mixed with the combustion gas of the burner 2 and led to the outlet 3. In addition, an internal air passage 10 is formed. The air inlet 11 is provided with an air filter 11 to suppress entry of dust or the like into the casing 9.

  The blower fan 6 is provided in the middle of the internal air passage 10 in a state in which it sucks into the air inlet 1 and the discharge part faces the air outlet 3. Thereby, the gas fan heater mixes the combustion gas of the burner 2 with the air in the space to be heated sucked through the air inlet 1, generates hot air, and blows out the hot air from the air outlet 3 to the space to be heated. The heating target space is configured to be heated.

  The igniter 4 is provided above the flame opening (not shown) of the burner 2, and a thermocouple 12 that detects ignition of the burner 2 is also provided above the flame opening of the burner 2. The thermocouple 12 is provided so as to come into contact with the flame formed by the burner 2, and is configured to output a higher output value as the temperature of the flame is higher.

  Although not shown in FIG. 1, the fuel supply path 13 to the burner 2 is provided with an electromagnetic on-off valve 14 for opening and closing the fuel supply path 13 and an electromagnetic type for adjusting the fuel supply amount to the burner 2. A proportional valve 15 is provided. The fuel interrupting means 5 includes an on-off valve 14 and a proportional valve 15. The fuel supply path 13 is connected to, for example, a city gas pipe (not shown) to which city gas (gas such as 13A, which is mainly composed of methane gas (CH4)) is supplied, and the city gas is supplied to the burner 2. It is comprised so that.

  The gas fan heater is provided with a CO sensor 16 for detecting the CO concentration. The CO sensor 16 is provided in the vicinity of the intake port 1 on the back surface of the casing 9 so as to detect the CO concentration in the air outside the casing 9 sucked through the intake port 1. The CO sensor 16 may be any sensor that can detect the CO concentration in the air to be detected, and various types such as a semiconductor type, a catalytic combustion type, and an electrochemical type can be applied. Such various types of CO sensors are well-known techniques, and therefore the description of their specific configurations is omitted.

  The operation unit 8 includes an operation switch 17 for instructing operation start and stop of the gas fan heater, an abnormality notification buzzer 18 for notifying abnormality, a temperature setting unit 19 for setting a heating target temperature, a heating target temperature, an indoor temperature, and the like. A display unit (not shown) for displaying various information is provided. The operation switch 17 is configured such that operation start and operation stop are instructed alternately each time the push operation is repeated.

Hereinafter, the control operation of the control unit 7 will be described.
The control unit 7 controls the operation of the blower fan 6, the fuel intermittent means 5, the igniter 4, and the like, thereby starting the combustion of the burner 2 by the operation start command by the operation switch 17, and the operation stop command by the operation switch 17. Thus, the combustion of the burner 2 is stopped. And the control part 7 makes the opening degree of the proportional valve 15 so that the temperature detected by the temperature sensor etc. outside a figure becomes the heating target temperature set in the temperature setting part 19 during combustion of the burner 2. It is adjusted. Further, the control unit 7 is configured to monitor the detected CO concentration detected by the CO sensor 16 during combustion of the burner 2 and stop the combustion of the burner 2 when the detected CO concentration becomes equal to or higher than the abnormal threshold value. ing. This prevents the combustion of the burner 2 from continuing even though the CO concentration is equal to or higher than the abnormal threshold, and further prevents the generation of CO.

  In the present invention, not only is the combustion of the burner 2 stopped when the detected concentration of the CO sensor 16 becomes equal to or higher than the abnormal threshold, but CO is generated due to incomplete combustion of the burner 2 when the detected CO concentration of the CO sensor 16 increases. CO generation state discriminating means 20 for discriminating whether the incomplete combustion CO generation state is in progress or the non-incomplete combustion CO generation state in which CO is generated due to factors other than incomplete combustion of the burner 2 Is provided. The CO generation state determination unit 20 is provided in the control unit 7.

FIG. 3 shows changes in the detected CO concentration of the CO sensor 16 and changes in the output value of the thermocouple 12 over time. In the figure, the detected CO concentration of the CO sensor 16 is indicated by K1, and the output value of the thermocouple 12 is indicated by K2.
FIG. 3A shows a case where the burner 2 is incompletely combusted. FIG. 3B shows that CO is included in the air sucked from the intake port 1 when the burner 2 is not incompletely combusted, for example, by generating CO near the gas fan heater. Shows the case.

As shown in FIG. 3A, when the burner 2 is incompletely combusted, CO is generated due to the incomplete combustion, so the detected CO concentration K1 increases with time. When the burner 2 is incompletely combusted, the temperature of the flame formed by the burner 2 decreases, so the output value K2 of the thermocouple 12 decreases with time.
On the other hand, as shown in FIG. 3B, when CO is generated due to factors other than incomplete combustion of the burner 2, the CO sensor 16 converts the CO contained in the air sucked from the intake port 1. Since detection is performed, the detected CO concentration K1 increases with time. However, since the incomplete combustion of the burner 2 does not occur, the temperature of the flame formed in the burner 2 does not drop greatly, and the output value K2 of the thermocouple takes a value close to a constant value.

  From the above, it can be said that the burner 2 is incompletely burned if the output value of the thermocouple 12 decreases when the detected CO concentration of the CO sensor 16 increases. On the other hand, if the output value of the thermocouple 12 is not lowered when the detected CO concentration of the CO sensor 16 is increased, the burner 2 has not caused incomplete combustion, and is due to factors other than incomplete combustion of the burner 2. It can be said that CO is generated. Thus, it can be said that there is a certain relationship between the presence or absence of incomplete combustion of the burner and the tendency of the output value of the thermocouple.

  Therefore, if the CO generation state determination means 20 provided in the control unit 7 detects an increase in the detected CO concentration before the detected CO concentration of the CO sensor 16 reaches the abnormal threshold value, the output value of the thermocouple 12 tends to decrease. It is determined whether or not there is an incomplete combustion CO generation state if the output value of the thermocouple 12 is decreasing, and if the output value of the thermocouple 12 is not decreasing, the non-incomplete combustion CO is determined. It is determined that it is occurring.

Here, as a configuration for detecting an increase in the detected CO concentration before the detected CO concentration of the CO sensor 16 reaches the abnormal threshold, for example, the CO generation state determination unit 20 is configured to detect the CO sensor 16. When the CO concentration is equal to or higher than an increase determination value (for example, 20 ppm set to a value smaller than the abnormal threshold), the detected CO concentration of the CO sensor 16 increases before the detected CO concentration of the CO sensor 16 reaches the abnormal threshold. It is comprised so that it may discriminate | determine.
Further, for example, the CO generation state determining means 20 is configured such that the degree of increase in the detected CO concentration per unit time of the CO sensor 16 (the slope of the change in the detected CO concentration with respect to the change in time per unit time) is the set increase degree. If the value is larger than that, it can be configured that the detected CO concentration is increased before the detected CO concentration of the CO sensor 16 reaches the abnormal threshold.

As a configuration for determining whether or not the output value of the thermocouple 12 is in a decreasing tendency, when the CO generation state determining means 20 is less than or equal to a decreasing tendency determination value (for example, 15 mV), It is configured to determine that the output value of the thermocouple 12 is decreasing. Here, the lower tendency determination value is set to a value lower than the output value of the thermocouple 12 when the burner 2 does not cause incomplete combustion.
Further, for example, the incomplete combustion determination means 20 sets the degree of decrease in the output value of the thermocouple 12 per unit time (the slope of the variation of the output value of the thermocouple 12 with respect to the variation of time per unit time). If the degree of decrease is greater than the degree of decrease, the output value of the thermocouple 12 may be determined to be decreasing.

  In this manner, when the CO generation state determination means 20 determines that the incomplete combustion CO generation state is present, the CO detected by the CO sensor 16 is recognized as being generated by the incomplete combustion of the burner 2. can do. On the other hand, when the CO generation state determination means 20 determines that the non-incomplete combustion CO generation state is present, the CO detected by the CO sensor 16 is a factor other than the incomplete combustion of the burner 2, such as tobacco smoke, for example. It can be recognized that the error occurred.

  Moreover, in addition to the CO generation state determination unit 20, the gas fan heater is notified of an abnormal threshold setting unit 21 for setting an abnormal threshold serving as a reference for whether or not to stop the combustion of the burner 2, and the occurrence of CO. Notification means 22 is provided. The abnormality threshold setting unit 21 is provided in the control unit 7, and the notification unit 22 includes a buzzer control unit 23 that is provided in the control unit 7 and controls the operation of the abnormality notification buzzer 18, and the abnormality notification buzzer 18. Yes.

When the CO generation state determination unit 20 determines that the incomplete combustion CO generation state is present, the abnormal threshold setting unit 21 determines that the CO generation state determination unit 20 determines that the non-incomplete combustion CO generation state occurs. The abnormality threshold is set to a low value. For example, the abnormal threshold value setting means 21 sets the abnormal threshold value for incomplete combustion (for example, 30 ppm) as the abnormal threshold value when the incomplete combustion CO is generated (see the middle dotted line in FIG. 3 (a)). When the combustion CO is generated, an abnormal threshold value (for example, 100 ppm) for non-incomplete combustion is set as the abnormal threshold value (see the dotted line in FIG. 3B).
By setting the abnormal threshold value in this way, when CO is generated due to incomplete combustion of the burner 2, combustion of the burner 2 can be stopped quickly and further generation of CO can be prevented. In addition, for example, when CO is generated due to a transient factor other than incomplete combustion of the burner 2 such as cigarette smoke, the combustion of the burner 2 is stopped even though the combustion of the burner 2 can be continued. It is possible to prevent the user's usability from deteriorating.

  When the CO generation state determination unit 20 determines that the incomplete combustion CO generation state is present, the notification unit 22 performs a notification operation for incomplete combustion, and the CO generation state determination unit 20 generates the non-incomplete combustion CO generation. When it is determined that the state is in a state, a notification operation for non-incomplete combustion is performed. In both the notification operation for incomplete combustion and the notification operation for non-incomplete combustion, the buzzer control unit 23 operates the abnormality notification buzzer 18, but the notification operation for incomplete combustion and non-incomplete combustion are performed. The buzzer control unit 23 activates the abnormality notification buzzer 18 so as to emit a warning sound different from that for the notification operation.

A control operation of the control unit 7 will be described based on the flowchart of FIG.
When the operation start is instructed by the operation switch 17, the controller 7 performs an ignition process for igniting the burner 2 to start combustion of the burner 2, and the temperature detected by a temperature sensor or the like outside the figure is the heating target temperature. The operation is started by adjusting the opening of the proportional valve 15 so as to become (steps # 1, # 2). The CO generation state determination means 20 of the control unit 7 monitors the detected CO concentration of the CO sensor 16, and if the detected CO concentration increases before the detected CO concentration of the CO sensor 16 reaches the abnormal threshold value. If it discriminate | determines, it will be discriminate | determined whether the output value of the thermocouple 12 is a downward tendency (step # 3, # 4).

  When the output value of the thermocouple 12 tends to decrease, the CO generation state determination unit 20 determines that the incomplete combustion CO generation state occurs, and the abnormal threshold setting unit 21 sets the abnormal threshold for incomplete combustion as the abnormal threshold. (Steps # 5 and # 6). On the other hand, if the output value of the thermocouple 12 does not tend to decrease, the CO generation state determination unit 20 determines that the non-incomplete combustion CO generation state occurs, and the abnormal threshold setting unit 21 sets the abnormal threshold for non-incomplete combustion. An abnormal threshold value is set (steps # 7 and # 8).

  The control unit 7 monitors the detected CO concentration of the CO sensor 16, and when the detected CO concentration of the CO sensor 16 becomes equal to or higher than the abnormal threshold, the on-off valve 14 and the proportional valve 15 are closed to stop the combustion of the burner 2. An abnormal stop is performed (steps # 9 and # 10). In this abnormal combustion stop, the operation of the blower fan 6 is continued until the set time elapses after the combustion of the burner 2 is stopped. Further, in step # 9, it is determined whether or not the detected CO concentration is equal to or higher than the abnormal threshold for incomplete combustion if it is incomplete combustion CO generation state. It is determined whether or not it is equal to or higher than the abnormal threshold for combustion.

When the combustion of the burner 2 is stopped, the buzzer control unit 23 activates the abnormality notification buzzer 18 when the CO generation state determination means 20 determines that it is in an incomplete combustion CO generation state, and notifies the incomplete combustion. When the operation is performed and the CO generation state determination means 20 determines that the non-incomplete combustion CO generation state is present, the abnormality notification buzzer 18 is operated to perform the abnormality notification for performing the notification operation for non-incomplete combustion (step) # 11).
The control unit 7 performs the above-described control operation until the operation stop is instructed by the operation switch 17, and when the operation stop is instructed by the operation switch 17, the on-off valve 14 and the proportional valve 15 are closed. The combustion of the burner 2 is stopped and the operation is stopped (steps # 12 and # 13).

[Another embodiment]
(1) In the above embodiment, as a configuration for determining whether or not the output value of the thermocouple 12 tends to decrease, for example, the output value of the thermocouple 12 continuously decreases for a set number of times or more. Thus, it can be determined that the output value of the thermocouple 12 is in a decreasing tendency. In this case, for example, the set amount can be set to be a constant amount or can be changed so that the set amount increases every time a decrease in the set amount or more is detected.

(2) In the above embodiment, the abnormal threshold setting means 21 sets the abnormal threshold for incomplete combustion (for example, 30 ppm) to the abnormal threshold when the incomplete combustion CO is generated, and the non-incomplete combustion CO is generated. In this case, the abnormal threshold value for non-incomplete combustion (for example, 100 ppm) is set as the abnormal threshold value. For example, the abnormal threshold value for incomplete combustion and the abnormal threshold value for non-incomplete combustion are not constant values. Alternatively, it can be changed and set based on the degree of increase in the detected CO concentration per unit time.

(3) In addition to the gas fan heater exemplified in the above embodiment, the present invention can be applied to various open-type combustion devices such as a gas stove, an oil fan heater, an oil stove, and a hot water supply device.

  The present invention relates to a burner that burns supplied fuel, a blower that sucks air through an intake port and exhausts the combustion exhaust gas of the burner from a blowout port, a CO sensor that detects a CO concentration, and the CO sensor When the detected CO concentration exceeds the abnormal threshold value, burner control means for stopping the burner combustion is provided, and CO is generated due to factors other than incomplete combustion of the burner without complicating the configuration. Sometimes, it can be applied to various open-type combustion devices that can suppress erroneous determination that the CO concentration is high due to incomplete combustion of the burner.

1 Inlet 2 Burner 3 Outlet 6 Blower (Blower Fan)
12 Thermocouple 16 CO Sensor 20 CO Generation State Discriminating Unit 21 Abnormal Threshold Setting Unit 22 Notification Unit

Claims (5)

A burner for burning the supplied fuel;
An air blowing means for sucking air through the air inlet and exhausting the combustion exhaust gas of the burner from the air outlet;
A CO sensor for detecting the CO concentration;
When the detected CO concentration detected by the CO sensor is equal to or higher than an abnormal threshold value, an open type combustion device provided with burner control means for stopping combustion of the burner,
A thermocouple that outputs a higher output value as the temperature of the flame formed by the burner is higher;
It is determined whether CO is generated due to incomplete combustion of the burner or incomplete combustion CO generated due to factors other than incomplete combustion of the burner. And a CO generation state determining means for providing
When the detected CO concentration increases before the detected CO concentration reaches the abnormal threshold, the CO generation state determining means determines whether the output value of the thermocouple is decreasing or not. An open-type combustion apparatus configured to determine that the incomplete combustion CO generation state is determined as a tendency, and to determine that the non-incomplete combustion CO generation state is not a decrease tendency.   When the CO generation state determination unit determines that the incomplete combustion CO generation state is present, the abnormal threshold is set to a lower value than when the CO generation state determination unit determines that the non-incomplete combustion CO generation state occurs. The open-type combustion apparatus according to claim 1, wherein an abnormal threshold value setting means for setting is provided.   The CO generation state determination unit is configured to determine that the output value of the thermocouple is in a decreasing tendency when the output value of the thermocouple is equal to or less than the decrease tendency determination value. Open combustion equipment.   The CO generation state determination unit is configured to determine that the output value of the thermocouple is in a decreasing tendency when the decrease degree per unit time of the output value of the thermocouple is larger than a set decrease degree. The open type combustion apparatus according to claim 1 or 2.   When the CO generation state determination means determines that the incomplete combustion CO generation state is present, an incomplete combustion notification operation is performed, and the CO generation state determination means determines that the non-complete combustion CO generation state exists. The open-type combustion apparatus of any one of Claims 1-4 in which the alerting | reporting means which performs the alerting | reporting action | operation for non-incomplete combustion is provided when it did.

Images