JP3654607B2 - Incomplete combustion prevention device for gas combustion equipment - Google Patents

Description

【００３１】
尚、本実施例において、エアフローセンサ６の代りに例えば差圧によりＯＮする差圧スイッチ、直接風量を検出する風量センサ等を用いてもよい。また、報知は操作リモコン等から行なってもよく、報知方法はランプの点滅や音声での報知等、またそれらを組合わせたものであってもよい。またセンサバーナ３は、メインバーナ２の一部のバーナユニットの１次空気及び２次空気の供給量を少なくしたものであってもよい。
【００３２】
以上本発明の実施例について説明したが、本発明はこうした実施例に何等限定されるものではなく、本発明の要旨を逸脱しない範囲において、種々なる態様で実施し得ることは勿論である。
【００３３】
【発明の効果】
以上詳述したように、本発明の請求項１記載のガス燃焼機器の不完全燃焼防止装置によれば、センサバーナに形成される炎状態の悪化した原因をエアフローセンサの出力から判断し、その原因に応じた改善運転を行なうことで、燃焼状態を最適に改善することができるため、器具の寿命を延ばすことができる。
【００３４】
更に、本発明の請求項２記載のガス燃焼機器の不完全燃焼防止装置によれば、ＣＯセンサにより炎検出センサやエアフローセンサで検出できない部分的な不完全燃焼を検出し、検出値が所定値以上となった場合には燃焼運転を停止するため安全である。
【００３５】
更に、本発明の請求項３記載のガス燃焼機器の不完全燃焼防止装置によれば、複数のエアフローセンサにより異常原因を特定することができるため、修理が必要な場合には素早く対応することができる。
【図面の簡単な説明】
【図１】本発明の第１実施例としての不完全燃焼防止装置を備えた給湯器の概略構成図である。
【図２】本実施例のセンサバーナの概略構成図である。
【図３】第１実施例の不完全燃焼防止制御ルーチンを表すフローチャートである。
【図４】本発明の第２実施例としての不完全燃焼防止装置を備えた給湯器の概略構成図である。
【図５】第２実施例の不完全燃焼防止制御ルーチンを表すフローチャートである。
【図６】エアフローセンサの取付け位置を表す図である。
【符号の説明】
１…ケース、 ２…メインバーナ、 ３…センサバーナ、 ４…熱電対、
５…ガス供給路、 ６…エアフローセンサ、 １０…排気筒、
１１…ＣＯセンサ、 １２…ファン、 １３…コントローラ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an incomplete combustion preventing device for a gas combustion device, and more particularly to an incomplete combustion preventing device for a gas combustion device.
[0002]
[Prior art]
Incomplete combustion, which is a cause of carbon monoxide poisoning, is mainly caused by two causes, a shortage of combustion air due to a poor supply / exhaust system of the combustor and a decrease in oxygen concentration. Therefore, conventionally, gas combustion equipment has been provided with a safety device that detects incomplete combustion and stops combustion. As a method for detecting incomplete combustion of such a safety device, a CO sensor method for directly detecting the CO concentration, a sensor burner method for detecting the flame state of a sensor burner in which the flame state changes more sensitively than the main burner, and an air volume An air flow sensor method for measuring wind pressure or the like is used.
[0003]
For example, in the CO sensor system, even if high detection accuracy can be obtained at room temperature, it must be placed at a high temperature such as an exhaust gas flow path, so that a low CO concentration of about 300 ppm can be accurately detected during combustion. There was a problem that I couldn't. In addition, if the sensor burner method or the air flow sensor method is used, it is possible to cope with the generation of low concentration CO. However, if the air flow sensor method is used, it is possible to detect a shortage of combustion air but not to detect a decrease in oxygen concentration. is there. However, the sensor burner system that detects an oxygen supply shortage such as a shortage of combustion air or a decrease in oxygen concentration is safe because it can predict incomplete combustion in advance.
[0004]
Further, as a countermeasure when the detector detects incomplete combustion, there is one that performs an improved operation such as increasing the fan speed to improve the combustion. By performing such an improved operation, the life of the instrument can be extended.
[0005]
[Problems to be solved by the invention]
However, the sensor burner method cannot determine whether the cause of incomplete combustion is a shortage of combustion air or a decrease in oxygen concentration. Therefore, even if incomplete combustion is detected and the fan speed is increased by improved operation, the oxygen concentration decreases. In this case, oxygen in the air simply passes without being in good contact with the flame, and the flame is lifted due to an increase in the air volume, and the flame may disappear or the combustion state may deteriorate. In addition, there is a disadvantage that it cannot be detected when partial incomplete combustion occurs due to clogging of some burner flames.
[0006]
An object of the present invention is to provide an incomplete combustion preventing device for solving the above-mentioned problems and performing an optimal improvement operation.
[0007]
[Means for Solving the Problems]
The incomplete combustion preventing device for a gas combustion device according to claim 1 of the present invention for solving the above-mentioned problem is a sensor burner in which the state of the flame changes sensitively with respect to an insufficient oxygen supply amount compared to the main burner for heating,
A flame detection sensor whose output changes according to the flame state of the sensor burner;
An air flow sensor for detecting a supply state of combustion air by a blower fan;
When both the deterioration of the flame state and the deterioration of the ventilation state are detected by the flame detection sensor and the air flow sensor, respectively, it is determined that the cause of the deterioration of the flame state is a shortage of combustion air . When the number of revolutions is increased and only the deterioration of the flame state is detected by the flame detection sensor, it is determined that the deterioration of the flame state is caused by a decrease in oxygen concentration, and the gas supply to the heating main burner is performed. The gist of the invention is that it has improved operation means for reducing the amount.
[0008]
The incomplete combustion preventing device for gas combustion equipment according to claim 2 of the present invention for solving the above-mentioned problems is the incomplete combustion preventing device for gas combustion equipment according to claim 1, wherein the CO concentration in the exhaust gas is set on the exhaust path. The gist is to provide a CO sensor to detect, and to stop the supply of fuel gas when the output of the CO sensor exceeds a predetermined value.
[0009]
The incomplete combustion preventing device for a gas combustion device according to claim 3 of the present invention that solves the above-described problem is the incomplete combustion preventing device for a gas combustion device according to claim 1 or 2, wherein the incomplete combustion preventing device for the gas combustion device has a plurality of outputs that differ depending on an abnormal location. Bei example the air flow sensor portion, to identify the abnormal point of the air intake passage and an exhaust passage from an output of the air flow sensor of the plurality, is summarized in that with the abnormality location notifying means for notifying to that effect.
[0010]
The incomplete combustion preventing apparatus for a gas combustion apparatus according to claim 1 of the present invention having the above-described configuration detects the deterioration of the flame state of the sensor burner by the flame detection sensor and further deteriorates the ventilation state of the combustion air by the air flow sensor. Is detected, it is determined that the cause of the deterioration of the flame condition is a shortage of combustion air, and an improvement operation is performed in which the rotational speed of the blower fan is increased to increase the combustion air. In addition, when only the flame detection sensor detects the deterioration of the flame state, the deterioration of the ventilation state is not detected by the air flow sensor. Therefore, it is determined that the deterioration of the flame state is caused by the decrease in oxygen concentration. An improved operation is performed to reduce the amount of combustion in the main burner for heating by reducing the supply amount. Thus, the combustion state can be optimally improved by performing the improvement operation according to the cause of the deterioration of the flame state.
[0011]
The incomplete combustion preventing device for a gas combustion device according to claim 2 of the present invention having the above-mentioned configuration includes a CO sensor for detecting the CO concentration in the exhaust gas on the exhaust path, so that some burner flame clogging and the like Even if partial incomplete combustion occurs and cannot be detected by the flame detection sensor and air flow sensor, the CO sensor detects an increase in CO concentration, and the fuel gas is supplied when the detected value exceeds a predetermined value. By blocking, partial incomplete combustion can also be prevented.
[0012]
The incomplete combustion preventing apparatus for a gas combustion device according to claim 3 of the present invention having the above-described configuration includes an air flow sensor in a plurality of portions that output differently depending on an abnormal location, and identifies the abnormal location based on each output. In order to notify the fact, the cause of the abnormality can be known.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the incomplete combustion preventing apparatus for gas combustion equipment of the present invention will be described below. FIG. 1 is a schematic configuration diagram of a water heater provided with an incomplete combustion preventing device as a first embodiment of the present invention. This gas water heater includes a case 1 that forms a combustion chamber, a main burner 2 in which a plurality of burner units in which a plurality of flame openings are arranged are arranged side by side, and a sensor burner that is provided adjacent to the main burner 2. 3, a thermocouple 4 for detecting the state of a flame formed in the sensor burner 3, a gas supply path 5 for supplying gas to the main burner 2 and the sensor burner 3, and an amount of combustion air sent to the main burner 2 An air flow sensor 6 to be detected, a heat exchanger 9 that heats water passed from the water supply pipe 7 by combustion of the main burner 2 and sends it to the hot water discharge pipe 8, and an exhaust pipe that becomes a passage for sending exhaust gas generated by combustion to the outside 10, a CO sensor 11 that detects the CO concentration of exhaust gas in the exhaust passage, a fan 12 that is provided at the bottom of the case 1 and supplies combustion air into the case 1, and a controller that controls combustion control. Consisting of over La 13.
[0014]
As shown in FIG. 2, the sensor burner 3 is provided with a porous plate 3 b in a cylindrical body 3 a, performs all primary combustion on the plate 3 b, and detects the state of this flame with the thermocouple 4. Therefore, the combustion becomes unstable compared to the main burner 2, and even if the combustion air is insufficient or the oxygen concentration is low, the flame reacts sensitively and lifts and reaches the opening at the tip of the cylinder 3a. Secondary air is supplied and bunsen combustion is performed. Therefore, it can be predicted in advance that the electromotive force of the thermocouple 4 changes and incomplete combustion of the main burner 2 occurs. However, it cannot be detected when partial incomplete combustion occurs due to clogging of a part of the flame burner of the main burner 2.
[0015]
In the gas supply path 5, an original solenoid valve 14, a proportional solenoid valve 15, and a main solenoid valve 16 are provided in series. The original solenoid valve 14 and the main solenoid valve 16 are valves that only open and close the gas flow path, and the proportional solenoid valve 15 is a control valve that is set to an opening degree corresponding to a control signal and adjusts to a desired gas supply amount. .
[0016]
The air flow sensor 6 includes two gas introduction pipes 61 and 62, and the inlet a of the gas introduction pipe 61 is generated by a differential pressure generated before and after the burner when combustion air flows through the burner units of the main burner 2. The flow rate of the gas flowing from the gas to the outlet b of the gas introduction pipe 62 is measured. When clogging occurs in the air supply path or the exhaust path, the supply amount of secondary air decreases, and the output of the air flow sensor 6 decreases. Therefore, it is possible to predict in advance that incomplete combustion will occur by determining that the combustion air is insufficient when the output of the air flow sensor becomes a predetermined value or less. In addition, it cannot be detected when partial incomplete combustion occurs due to clogging of a part of the flame outlet of the main burner 2, but when clogging increases and the secondary air flow path between the burner units is blocked, The air flow sensor 6 serves as a bypass flow path, and the output may be increased. Also in this case, it is possible to detect incomplete combustion when the output exceeds a predetermined value. However, lack of oxygen concentration cannot be detected due to detection by gas flow rate.
[0017]
The CO sensor 11 is provided in the exhaust passage and directly detects the CO concentration of the exhaust gas. Therefore, it can be detected regardless of shortage of secondary air or a decrease in oxygen concentration, but because it is placed at a high temperature, the detection accuracy at low CO concentration (300 ppm) is poor and the CO concentration can be detected accurately (1000 ppm) or higher. In this case, incomplete combustion is detected, so that it is impossible to predict in advance that incomplete combustion will occur. However, by directly detecting the CO concentration, it is possible to detect even when partial incomplete combustion occurs due to clogging of a part of the flame burner of the main burner 2, so that the sensor burner 3 and the air flow sensor 6 It supplements the part that cannot be detected with.
[0018]
The controller 13 includes a CPU, RAM, and ROM that form a well-known arithmetic logic operation circuit (not shown), an input interface that inputs signals from various sensors, an output interface that outputs drive signals to various actuators, and the like. And based on the signal from each sensor, it not only opens and closes each solenoid valve, but also performs hot water temperature control, ignition control, etc., but relates to a sensor, ignition device, etc. not directly related to the present invention. The description and illustration are omitted.
[0019]
Next, the operation of the water heater provided with the incomplete combustion preventing device of this embodiment will be described. FIG. 3 is a flowchart showing an incomplete combustion prevention control routine executed by the controller 13 and is started in accordance with the ignition operation. When this routine is started, the main burner 2 is ignited by an ignition device (not shown) to start a combustion operation (S1). When the main burner 2 burns, the combustion state of the flame formed in the sensor burner 3 is detected by the thermocouple 4 (S2). When the combustion state of the flame is normal and the output of the thermocouple 4 is equal to or higher than a predetermined value (S2: YES), it is determined that neither the combustion air amount nor the oxygen concentration is abnormal, but the CO sensor 11 detects the CO concentration. (S3) It is checked whether partial incomplete combustion has occurred due to partial burner flame clogging. When the output of the CO sensor 11 is less than a predetermined value (1000 ppm in this embodiment) (S3: YES), it is determined that there is no abnormality. However, if the output of the CO sensor 11 is greater than or equal to the predetermined value (1000 ppm) (S3: NO), it is determined that partial incomplete combustion has occurred and the original solenoid valve 14 and the main solenoid valve 16 are turned on. It closes and stops combustion, and notifies that an abnormality has occurred by a display or buzzer (not shown) (S4).
[0020]
On the other hand, when the flame formed in the sensor burner 3 is lifted and the output of the thermocouple 4 becomes less than the predetermined value in step 2 (S2: NO), the cause is a shortage of combustion air or a decrease in oxygen concentration. It is determined that there is a gas flow, and the air flow sensor 6 detects the gas flow rate (S5). If the output of the air flow sensor 6 is outside the predetermined range (S5: YES), it is determined that the combustion air is insufficient, and an improvement operation is performed to increase the fan rotational speed by a predetermined amount (S6). Such improvement operation is repeated until the combustion state of the flame formed in the sensor burner 3 is improved (S7: YES). However, the combustion state of the flame formed in the sensor burner 3 is not improved in spite of repeated improvement operation, and the increase in the fan rotation speed is outside the predetermined improvement range (in this embodiment, 10% increase from the reference rotation speed). ) (S7: NO), the main solenoid valve 14 and the main solenoid valve 16 are closed to stop the combustion, and a display or buzzer (not shown) notifies that an abnormality has occurred (S8).
[0021]
In step 5, when the output of the air flow sensor 6 is within the predetermined range (S5: NO), it is determined that the oxygen concentration is low because the combustion air amount is normal, and the proportional solenoid valve is throttled to reduce the gas. The supply amount is decreased by a predetermined amount to notify that ventilation is necessary (S9). Such improvement operation is repeated until the combustion state of the flame formed in the sensor burner 3 is improved (S10: YES). However, the combustion state of the flame formed in the sensor burner 3 is not improved in spite of repeated improvement operation, and the decrease in the gas supply amount is outside the predetermined improvement range (in this embodiment, 10% lower than the reference supply amount). ) (S10: NO), the main solenoid valve 14 and the main solenoid valve 16 are closed to stop combustion, and a ventilation warning is given by notification by a display or buzzer (not shown) (S11).
[0022]
According to the water heater provided with the incomplete combustion preventing device of the first embodiment of the present invention described above, the partial incomplete combustion is checked by the CO sensor 11 when the output of the thermocouple 4 is normal. If incomplete combustion is detected, the operation of the instrument is stopped, which is safe. If the thermocouple 4 outputs an abnormality, the output of the air flow sensor 6 determines whether the cause of the incomplete combustion is a shortage of combustion air or a decrease in oxygen concentration, and performs different improvement operations. Optimal action can be taken. In addition, it is safe because the user can be informed that ventilation is necessary by notifying the decrease in oxygen concentration. If the combustion is not improved even if the improved operation is continued, it is safe because the operation of the instrument is stopped.
[0023]
In the present embodiment, the air flow sensor 6 is connected with the main burner 2 interposed therebetween. For example, the air flow sensor 6 is connected with the heat exchanger 9 interposed therebetween. It may be connected to the outlet and outside the case (atmospheric pressure), connected to inside the case and outside the case (atmospheric pressure), and the like. In place of the air flow sensor 6, for example, a differential pressure switch that is turned ON / OFF by a differential pressure, an air volume sensor that directly detects an air volume, or the like may be used. Further, the notification may be performed from an operation remote controller or the like, and the notification method may be blinking of a lamp, notification by voice, or a combination thereof. Further, the sensor burner 3 may be one in which the supply amount of primary air and secondary air of some burner units of the main burner 2 is reduced.
[0024]
Next, a second embodiment of the present invention will be described. FIG. 4 is a schematic configuration diagram of a water heater provided with an incomplete combustion preventing device as a second embodiment. The basic configuration is the same as that of the hot water heater of the first embodiment (FIG. 1), but differs in that the CO sensor is not provided and the air flow sensor is provided on both sides of the heat exchanger 9. Other configurations are denoted by the same reference numerals and description thereof is omitted.
[0025]
The air flow sensors are provided on both sides of the heat exchanger 9, the first air flow sensor 6a measures the flow rate of the gas flowing due to the differential pressure across the heat exchanger 9 on the left side of FIG. 4, and the heat exchanger 9 on the right side of FIG. The second airflow sensor 6b measures the flow rate of the gas flowing due to the differential pressure across the front and rear. In general, there are many cases where fin clogging occurs from the end, so air flow sensors are installed on both sides, non-combustion is predicted by the output, and further, the output difference is detected to determine whether partial fin clogging has occurred be able to. Here, the clogging of the burner flame that causes partial incomplete combustion is considered to be caused by falling objects from the fins, and it is not necessary to consider partial incomplete combustion due to clogging of the burner flame before clogging the fins. In addition, partial incomplete combustion may be caused by partial clogging of the primary and secondary air ports at the lower part of the main burner 2, but if this occurs, the overall air flow decreases and the air flow sensors 6a, 6b. Therefore, it is not necessary to use a CO sensor.
[0026]
Next, the operation of the water heater provided with the incomplete combustion preventing device of the second embodiment will be described. FIG. 5 is a flowchart showing an incomplete combustion prevention control routine executed by the controller 13 and is started in accordance with the ignition operation. When this routine is started, the main burner 2 is ignited by an ignition device (not shown) to start a combustion operation (S1). When the combustion operation is started, it is first detected whether or not fin clogging has occurred. When the output difference between the first air flow sensor 6a and the second air flow sensor 6b is less than a predetermined value (S2: YES), it can be determined that there is no fin clogging. Next, in order to detect whether the amount of combustion air supplied by the fan 12 is normal, it is checked whether the outputs of the first air flow sensor 6a and the second air flow sensor 6b are within a predetermined range. When the outputs of the two air flow sensors 6a and 6b are both within the predetermined range (S3: YES), it is determined that the amount of combustion air is normal, and the oxygen concentration decreases due to the state of the flame formed in the sensor burner 3. Is checked (S4). When the output of the thermocouple 4 is greater than or equal to a predetermined value (S4: YES), it is determined that the oxygen concentration is also normal. However, when the flame formed in the sensor burner 3 is lifted and the output of the thermocouple 4 becomes less than a predetermined value (S4: NO), it is determined that the oxygen concentration is lowered, the proportional solenoid valve is throttled, and the gas The supply amount is decreased by a predetermined amount to notify that ventilation is necessary (S5). Such improvement operation is repeated until the combustion state of the flame formed in the sensor burner 3 is improved (S6: YES). However, the combustion state of the flame formed in the sensor burner 3 is not improved in spite of repeated improvement operation, and the decrease in the gas supply amount is outside the predetermined improvement range (down 10% from the reference supply amount). In this case (S6: NO), the original solenoid valve 14 and the main solenoid valve 16 are closed to stop combustion, and a ventilation warning is given by notification by a display or buzzer (not shown) (S7).
[0027]
On the other hand, in step 2, even if the output difference between the first air flow sensor 6a and the second air flow sensor 6b is less than a certain value (S2: YES), at least the output of the first air flow sensor 6a and the second air flow sensor 6b If one is outside the predetermined range (S3: NO), it is determined that there is a shortage of combustion air due to clogging of places other than the fins, and an improvement operation is performed to increase the fan rotational speed by a predetermined amount (S8). Such an improvement operation is repeated until the combustion state of the flame formed in the sensor burner 3 is improved (S9: YES). However, the combustion state of the flame formed in the sensor burner 3 is not improved in spite of repeated improvement operation, and the increase in the fan speed is outside the predetermined improvement range (up 10% from the reference speed). In the case (S9: NO), the original solenoid valve 14 and the main solenoid valve 16 are closed to stop the combustion, and a notification is made that an abnormality has occurred by a display or buzzer (not shown) (S10).
[0028]
If the output difference between the first air flow sensor 6a and the second air flow sensor 6b is equal to or greater than a certain value (S2: NO), it can be determined that it is due to fin clogging. The buzzer notifies that repair is necessary (S11).
[0029]
According to the water heater provided with the incomplete combustion preventing device of the second embodiment of the present invention described above, the two airflow sensors 6a and 6b are provided on both sides of the fin, so that the fins are clogged from the output difference. It can be determined whether the blockage is other than the fins. For this reason, when combustion is stopped due to abnormality detection, it is possible to notify the user whether the cause is easily recovered by filter cleaning or the like, or that requires repair, which is convenient. Further, by identifying the fin clogging, it is not necessary to provide the CO sensor 11 to stop the combustion operation before the main burner 2 is clogged, which causes partial incomplete combustion. Is safe. In addition, it is safe because the sensor burner 3 is provided so that an oxygen concentration shortage can be detected, and it is understood that ventilation is required by notification.
[0030]
In this embodiment, the air flow sensors are provided on both sides of the heat exchanger 9 in order to identify the fin clogging, but the location to be identified is not limited to the fins, and the air flow sensor of the air flow sensor is determined according to the location to be identified. The mounting position can be changed. Further, by providing air flow sensors in a plurality of portions and notifying the location where clogged due to poor combustion from the output pattern, it is possible to quickly cope with repairs. For example, as shown in FIG. 6, the measurement position 6 </ b> A by the differential pressure across the heat exchanger 9, the measurement position 6 </ b> B by the differential pressure before and after the fixed orifice 20 is provided in the supply and exhaust, and the measurement position by the differential pressure before and after the main burner 2. When the air flow sensor is provided at different positions such as 6C, the measurement position 6D by the differential pressure between the case and the atmospheric pressure, and the measurement position 6E by the differential pressure between the fan pressure and the atmospheric pressure, as shown in Table 1, the clogged location As a result, the air flow sensors output differently. In Table 1, “High” indicates that the output of the air flow sensor is increased, that is, the gas flow rate is increased, and “Low” indicates that the output is decreased, that is, the gas flow rate is decreased. For example, in the case of the air flow sensor 6A provided at the measurement position due to the differential pressure before and after the heat exchanger 9, when the portion other than the fin is clogged, the gas flow rate is reduced and the output is reduced. Since the sensor 6A serves as a bypass, the output becomes high. However, in the case of the air flow sensor 6C provided at the measurement position due to the differential pressure across the main burner 2, the output is reduced when a portion other than the main burner 2 is clogged, but the output is high when the main burner is clogged. Become. Thus, since the output of an airflow sensor differs, the abnormal location can be specified from the output pattern of a plurality of airflow sensors.
[Table 1]

[0031]
In this embodiment, instead of the air flow sensor 6, for example, a differential pressure switch that is turned on by a differential pressure, an air volume sensor that directly detects an air volume, or the like may be used. Further, the notification may be performed from an operation remote controller or the like, and the notification method may be a blinking lamp, a voice notification, or a combination thereof. Further, the sensor burner 3 may be one in which the supply amount of primary air and secondary air of some burner units of the main burner 2 is reduced.
[0032]
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.
[0033]
【The invention's effect】
As described above in detail, according to the incomplete combustion preventing device for a gas combustion device according to claim 1 of the present invention, the cause of the deterioration of the flame state formed in the sensor burner is determined from the output of the air flow sensor, By performing the improvement operation according to the cause, the combustion state can be optimally improved, so that the life of the appliance can be extended.
[0034]
Furthermore, according to the incomplete combustion preventing apparatus for a gas combustion device according to claim 2 of the present invention, the partial incomplete combustion that cannot be detected by the flame detection sensor or the air flow sensor is detected by the CO sensor, and the detected value is a predetermined value. When it becomes above, it is safe because the combustion operation is stopped.
[0035]
Furthermore, according to the incomplete combustion preventing apparatus for a gas combustion apparatus according to claim 3 of the present invention, the cause of the abnormality can be specified by a plurality of air flow sensors, so that when a repair is necessary, a quick response can be made. it can.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a water heater provided with an incomplete combustion preventing device as a first embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of a sensor burner according to the present embodiment.
FIG. 3 is a flowchart showing an incomplete combustion prevention control routine of the first embodiment.
FIG. 4 is a schematic configuration diagram of a water heater provided with an incomplete combustion preventing device as a second embodiment of the present invention.
FIG. 5 is a flowchart showing an incomplete combustion prevention control routine of a second embodiment.
FIG. 6 is a diagram illustrating an attachment position of an air flow sensor.
[Explanation of symbols]
1 ... case, 2 ... main burner, 3 ... sensor burner, 4 ... thermocouple,
5 ... Gas supply path, 6 ... Air flow sensor, 10 ... Exhaust tube,
11 ... CO sensor, 12 ... Fan, 13 ... Controller.

Claims (3)

A sensor burner in which the state of the flame changes sensitively to an insufficient oxygen supply compared to the main burner for heating,
A flame detection sensor whose output changes according to the flame state of the sensor burner;
An air flow sensor for detecting a supply state of combustion air by a blower fan;
When both the deterioration of the flame state and the deterioration of the ventilation state are detected by the flame detection sensor and the air flow sensor, it is determined that the cause of the deterioration of the flame state is a shortage of combustion air . When the number of revolutions is increased and only the deterioration of the flame state is detected by the flame detection sensor, it is determined that the deterioration of the flame state is caused by the decrease in oxygen concentration, and the gas supply to the heating main burner is performed. An incomplete combustion preventing device for gas combustion equipment, comprising: an improved operation means for reducing the amount. 2. The gas according to claim 1, further comprising a CO sensor for detecting the CO concentration in the exhaust gas on the exhaust path, and stopping the supply of fuel gas when the output of the CO sensor exceeds a predetermined value. Incomplete combustion prevention device for combustion equipment. E Bei the air flow sensor into a plurality of portions of different output by the abnormal point, to identify the abnormal point of the air intake passage and an exhaust passage from an output of the air flow sensor of the plurality, the abnormality location notifying means for notifying to that effect The incomplete combustion preventing apparatus for a gas combustion apparatus according to claim 1 or 2, further comprising:

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