JP2851236B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ventilation means for ventilating combustion air to a burner and discharging combustion gas to the outside of the room through an exhaust passage, and means for detecting incomplete combustion of the burner. When a command to stop combustion is issued, a post-purge is performed to stop the combustion of the burner and continue the operation of the ventilation means for a predetermined time after stopping the combustion of the burner, and The present invention relates to a combustion apparatus provided with control means for stopping combustion of the burner when the incomplete combustion detection means detects incomplete combustion.

[0002]

2. Description of the Related Art When an abnormal state due to incomplete combustion is detected in the above-mentioned combustion apparatus, the operation of the entire apparatus is stopped, and combustion gas which has an adverse effect on the human body leaks out of the apparatus. This is to prevent the inside of the room from being polluted by the combustion gas. When the incomplete combustion as described above occurs, such as when the exhaust passage is blocked for some reason, when combustion failure occurs due to a burner abnormality, the combustion gas leaks out of the device,
There may be a case where poor combustion occurs due to lack of oxygen due to ventilation of the air containing the combustion gas through the burner as combustion air by the ventilation means. By the way, conventionally, as shown in, for example, JP-A-5-26438, when it is determined that the combustion is in an incomplete combustion state, the operation of the entire apparatus, that is, the stop of the fuel supply to the burner and the stop of the ventilation means are performed. Operation was also configured to stop.

[0003]

As described above, when the operation of the apparatus is stopped in response to the detection of incomplete combustion, the combustion gas may have already leaked into the room. In such a conventional structure, in such a case, it is necessary to purify the indoor air by natural ventilation such as opening a window of the room. However, if such a ventilation operation is neglected, especially in a small room, a room with a high degree of sealing, etc., it is conceivable that the pollution state in which the degree of contamination by the combustion gas is high will continue for a long time, thereby eliminating adverse effects on the human body. May not be possible,
There was room for improvement in this regard. The present invention has been made in view of this point, and a purpose of the present invention is to provide a combustion device capable of quickly eliminating indoor pollution even when indoor pollution occurs when incomplete combustion is detected. Is to provide.

[0004]

The features of the first invention are as follows.
In the combustion device described at the beginning, when the incomplete combustion detection unit detects incomplete combustion, the control unit is configured to stop the combustion of the burner and execute the post-purge. It is in.

According to a second aspect of the present invention, in the combustion apparatus described at the beginning, the control means increases and decreases the ventilation amount of the ventilation means as the incomplete combustion detection means detects incomplete combustion. When the incomplete combustion detection means detects incomplete combustion despite increasing and changing the ventilation amount, the burner is stopped and the post-purge is executed. It is in the point.

According to a third aspect of the present invention, in the combustion device described at the beginning, the control means reduces the amount of combustion supplied to the burner as the incomplete combustion detection means detects incomplete combustion. If the incomplete combustion detection means detects incomplete combustion despite the change and the decrease in the amount of supplied combustion, the burner is stopped and the post-purge is executed. The point is that it is configured.

According to a fourth feature of the present invention, the control means includes:
The post-purge time executed when the incomplete combustion detection means detects incomplete combustion is set longer than the post-purge time executed when a command to stop combustion is issued. It is in.

A fifth aspect of the present invention is characterized in that a time measuring means for measuring a burn continuation time of the burner is provided, and the control means executes the post operation when the incomplete combustion detecting means detects incomplete combustion. The point is that the purging time is changed and set longer as the combustion continuation time is longer, based on the timing information of the timing means.

A sixth feature of the present invention is that the incomplete combustion detecting means detects a CO gas concentration in the combustion gas.
An O gas sensor, wherein the control means determines the post-purging time to be executed when the incomplete combustion detecting means detects incomplete combustion, based on the detection information of the CO gas sensor. The higher the is, the longer the change setting is made.

A seventh aspect of the present invention is characterized in that an operation commanding means for instructing the control means to start combustion based on a manual operation is provided, and the control means includes a means for detecting the incomplete combustion by the incomplete combustion detecting means. The point is that the control based on the operation command from the operation command means is prohibited from the time of detection until the end of the post-purge.

[0011]

According to the first aspect of the present invention, when the incomplete combustion of the burner is detected by the incomplete combustion detecting means, the burner is stopped and post-purge is executed.
The operation of the ventilation means is continued even after the combustion of the burner is stopped. Therefore, in a safe state in which additional generation of combustion gas is suppressed by stopping the combustion, the forced exhaust operation (forced ventilation) by the ventilation means is continued, so that residual gas generated due to fire extinguishing in the device. The air in the room as well as the unburned gas and the like is forcibly discharged to the outside through the exhaust passage by the ventilation means.

According to the characteristic configuration of the second invention, when the incomplete combustion of the burner is detected by the incomplete combustion detecting means, the amount of ventilation by the ventilation means is changed so as to increase, and thus the amount of ventilation increases. When the incomplete combustion state is detected even after the combustion, the combustion of the burner is stopped, the post-purge is executed, and the operation of the ventilation means is continued even after the combustion of the burner is stopped. It is. Therefore, when incomplete combustion occurs due to insufficient ventilation, it is possible to return to a normal combustion state by increasing the ventilation, and such a change in ventilation cannot cope with such a change in ventilation. When the combustion is detected, the above-described combustion stop operation and the subsequent forced exhaust operation (forced ventilation) by post-purge are executed.

According to the characteristic configuration of the third invention, when the incomplete combustion of the burner is detected by the incomplete combustion detecting means, the fuel supply amount to the burner is changed so as to decrease. When the incomplete combustion state is detected even after the pressure has decreased, the burner combustion is stopped, post-purge is executed, and the operation of the ventilation means continues even after the burner combustion is stopped. It is done. Therefore, even when incomplete combustion occurs due to lack of ventilation due to blockage in the exhaust path, etc., and the ventilation volume by the ventilation means is the maximum ventilation volume and cannot be changed, it is possible to cope with the small ventilation volume. By changing the fuel supply amount, the burner combustion state can be returned to a normal combustion state. If such a change in the fuel supply amount cannot be dealt with and incomplete combustion is detected, the combustion described above is performed. The forced exhaust operation (forced ventilation) by the stop operation and the subsequent post-purge is executed.

According to the characteristic feature of the fourth invention, the time of the post-purge performed after the combustion stop operation performed in response to the detection of incomplete combustion is the time of the post-purge performed in response to the normal combustion stop command. Since it becomes longer, in addition to the forced exhaust of residual fuel gas, unburned gas, and the like generated by the combustion stop in the device, which is performed by post-purge performed in accordance with the normal combustion stop command, It is possible to forcibly discharge the combustion gas or the like leaking into the room through the exhaust path by the ventilation means.

According to the characteristic configuration of the fifth invention, the post-purge time, which is performed after the combustion stop operation performed in response to the detection of incomplete combustion, becomes longer as the combustion continuation time becomes longer. That is, when the combustion gas leaks out of the apparatus, it is considered that the longer the duration of combustion, the more the interior of the room is contaminated, and accordingly, the forced exhaust operation by the ventilation means is executed. Is done.

According to the characteristic configuration of the sixth invention, incomplete combustion is detected rationally and accurately by detecting the concentration of CO gas, which is unburned gas, in the combustion gas. The higher the value, the longer the post-purge time performed after the combustion stop operation performed in accordance with the detection of incomplete combustion, so that the forced exhaust operation by the ventilation means can be performed efficiently according to the CO gas concentration.

According to the characteristic feature of the seventh invention, during the stop of combustion and the execution of post-purge in accordance with the detection of incomplete combustion, the start of combustion based on a manual operation is prohibited. The exhaust operation is reliably performed in a state where combustion of the burner has not been started.

[0018]

Therefore, according to the characteristic structure of the first invention,
When incomplete combustion is detected, forced ventilation by the ventilation means in a safe state in which burner combustion is stopped can ensure the ventilation of the room and improve the safety in use. It has become possible to provide a combustion device that can be used.

According to the characteristic configuration of the second aspect of the present invention, the above-described security by the characteristic configuration of the first aspect of the invention is ensured,
It is possible to return to the normal combustion state without immediately stopping the combustion.

According to the characteristic configuration of the third aspect of the present invention, while ensuring the above-described safety by the characteristic configuration of the first aspect of the present invention,
Even if the amount of ventilation by the ventilation means is the maximum volume and cannot be changed, it is possible to return to the normal combustion state.

According to the fourth aspect of the present invention, the room is reliably ventilated by post-purging for a longer period of time than is sufficient for exhausting unburned gas or the like which is normally generated when combustion stops in the apparatus. Safety can be ensured.

According to the characteristic configuration of the fifth aspect, the forced exhaust operation by the ventilation means can be efficiently performed according to the required amount.

According to the sixth aspect of the present invention, incomplete combustion is reasonably and accurately detected, and the forced exhaust operation by the ventilation means can be efficiently performed according to the required amount.

According to the characteristic configuration of the seventh aspect of the present invention, the forced exhaust operation by the ventilation means accompanying the detection of incomplete combustion is performed in a state in which combustion of the burner is not started. The function of forced ventilation by the ventilation means can be sufficiently exhibited as compared with the case where the combustion is started before the end of post-purge after the stop of the combustion, and safety is further improved.

[0025]

Embodiments will be described below with reference to the drawings. The combustion device (hot water supply device) according to the present invention, as shown in FIG.
The water heater A includes a control unit H as control means for controlling the operation of the water heater A, and an operation unit R as operation command means. The water heater A includes a combustion chamber 1, a burner 2 provided inside the combustion chamber 1, and a heat exchanger 3 for water heating.
And an exhaust path 5 connected to the upper part of the combustion chamber 1 for discharging the combustion gas from the burner 2 to the outside of the chamber, and supplying combustion air to the burner 2 and passing the combustion gas from the burner 2 to the exhaust path 5. Fan 4 as ventilation means for ventilating outside through the
A water supply path 6 for supplying water for heating to the heat exchanger 3; a water supply path 7 for supplying hot water heated in the heat exchanger 3 to a hot water tap (not shown); And a fuel supply path 8 for supplying (gas). In the drawing, reference numeral 30 denotes an igniter for ignition, and reference numeral 31 denotes a frame rod for detecting whether or not the burner 2 is ignited.

The water supply passage 6 has a water supply amount Qi to the heat exchanger 3.
Is provided with a water supply amount sensor 9 for detecting
Hot water temperature sensor 1 for detecting hot water temperature Tx for hot water tap
0 is provided. The fuel supply passage 8 is connected to a general household gas supply pipe.
An electromagnetic proportional valve 11 for adjusting a fuel supply amount Ip to the fuel cell and an intermittent valve 12 for intermittently supplying fuel are provided.

The operation unit R is connected to the control unit H by wire or wirelessly, and includes an operation switch 13 for instructing start and stop of the operation of the hot water supply device, a temperature setting switch 14 for setting a set target hot water supply temperature Ts, LE to display information of
D lamps 15 and 16 are provided. In addition, LED
The lamp 15 is configured to display whether the water heater is operating, and the LED lamp 16 is configured to display whether an incomplete combustion state has occurred.

The exhaust passage 5 is provided with a CO sensor S which is an example of an incomplete combustion detecting means for detecting a concentration value CO of an unburned component contained in the combustion gas of the burner 2. FIG.
Shows the configuration of the CO sensor S. CO
The sensor S is mounted on the pedestal 2 inside the protection frame 21 made of stainless steel.
2. Sensor element 23 and temperature-compensating reference element 24
Equipped. The sensor element 23 and the temperature-compensating reference element 24 are each composed of a platinum wire with a tangled catalyst, and are heated to about 200 ° C. by the flow of an electric current. The components burn by catalysis. At this time, since the catalyst tangled to the sensor element 23 has selectivity for CO, a difference occurs between the element temperatures. Since the resistance value of the platinum wire changes depending on the temperature, when the CO concentration in the combustion gas increases, the difference between the resistance values of the sensor element 23 and the temperature compensation reference element 24 increases. Therefore, the configuration is such that the CO concentration in the combustion gas can be detected as a difference between the resistance values (sensor output V). In the figure, reference numeral 25 denotes a control unit H.
It is a connector part with the lead wire connected to FIG.
The output V of the CO sensor S with respect to the CO concentration in the combustion gas
Is shown.

The control unit H includes combustion control means 101 for controlling the combustion operation of the water heater A, incomplete combustion determination means 102 for determining an incomplete combustion state based on the detected concentration value CO of the CO sensor S, During a set time T after the start of combustion of the burner 2, a timed restraining means 103 for restraining the operation of the incomplete combustion determining means 102, and a post-purge time for setting an operation time of a ventilation operation (post-purge) performed after the combustion operation is stopped. Setting means 104, operation locking means 105 for disabling an operation command by the operating section R after the incomplete combustion state is determined by the incomplete combustion determination means 102, and timing for measuring the combustion operation time from the start of combustion by the burner Means 10
6 are provided.

When the water supply amount Qi adjusted by the hot water tap and detected by the water supply amount sensor 9 reaches the set water amount, the combustion control means 101 executes the hot water supply operation described below, and when the water supply amount Qi becomes less than the set water amount, Stop the hot water supply operation. The hot water supply operation basically adjusts the fuel supply amount Ip of the burner 2 by adjusting the electromagnetic proportional valve 11 so that the hot water supply temperature Tx detected by the hot water supply temperature sensor 10 becomes the set target hot water supply temperature Ts. A target rotation speed F determined based on a preset characteristic as shown by a characteristic line L1 in FIG.
The rotation speed of the fan 4 is controlled so that In the following description, the basic control in the hot water supply operation is referred to as proportional control.

When the detected concentration value CO of the CO sensor S is equal to or greater than the set concentration value CO _CHK , the incomplete combustion determination means 102 detects the detected concentration value C of the CO sensor S every unit time.
In accordance with O, as the detected density value CO increases, the detected density value CO is multiplied by a weighting coefficient N, which is larger than the detected density value CO, to obtain a weight value F (F = N × CO). Are integrated, and as the integrated value M becomes equal to or greater than a preset set value M _CHK , it is determined that the combustion is incomplete. In the present embodiment, the incomplete combustion determination means 102 operates the combustion control means 101 to cut off the fuel supply to the burner 2 and stop the combustion as the incomplete combustion state is determined, In addition, the system is configured to notify the occurrence of an incomplete combustion state (abnormal display) by blinking the LED lamp 16.

The weighting coefficient N is set in advance in correspondence with the detected density value CO so that the larger the detected density value CO becomes, the larger the value becomes.

FIG. 4 shows a change in the output V of the CO sensor S when the combustion of the burner 2 is generally started. In the figure, the combustion start time of the burner 2 is shown at time t1. The sensor output V is initially
In the state where combustion is stopped (before time t1), the output value V1 unique to the sensor S is shown. Immediately after the start of combustion (immediately after time t1), a transient incomplete combustion state occurs in the combustion of the burner 2, and the concentration of unburned components in the exhaust gas (C
O) temporarily becomes very high, so that the output value V once becomes very high. When the combustion of the burner 2 becomes stable, the concentration (CO) of the unburned component decreases, so that the output value V decreases and the output value V2 indicating a steady combustion state.
Converges to

Therefore, the time restriction means 103 controls the incomplete combustion determining means 102 so that the transient incomplete combustion state immediately after the start of combustion is not determined to be abnormal. After elapse of (sec), the incomplete combustion determination means 102 is operated. That is, the operation of the incomplete combustion determination means 102 is suppressed during the set time T after the start of combustion of the burner 2.

The post-purge time setting means 104 shortens the operation time of the ventilation operation (post-purge) performed after the combustion is stopped, when the combustion is stopped based on the operation command, and the combustion stop based on the detection of the incomplete combustion state. In the case of, it is set to be long.

Hereinafter, the control operation of the hot water supply apparatus of this embodiment will be described with reference to the flowchart shown in FIG.
First, when the opening of the hot water tap is detected by the water supply amount sensor 9, the sensor power supply 25 is turned on, and the timed restraint means 103 is turned on.
, The timed restraint of the incomplete combustion determination means 102 is started [steps 1 to 3]. Then, the blowing (pre-purge) of the fan 4 is started, and the combustion of the burner 2 is started by the combustion control means 101 [steps 4 and 5]. That is,
The spark by the igniter 30 is started, and the electromagnetic proportional valve 1
1 and the intermittent valve 12 are opened to start combustion. Burner 2
Whether or not the fire transfer to the frame rod 31 is completed
The detection is performed by At the same time as the start of combustion, the timing means 106 starts timing (step 6).

Further, the combustion control (proportional control) during the timed restraint by the timed restraint means 103 is performed [Step 7].
2 is performed (steps 8 and 9). Therefore, during the operation of the timed restraint means 103, the incomplete combustion determination means 102 is not operated.

When the combustion control after the time limit check is completed, the operation shifts to a control operation for stopping the combustion. In the control operation for stopping combustion, the combustion control means 101 closes the electromagnetic proportional valve 11 and the intermittent valve 12 to stop the combustion of the burner 2, performs post-purge, and turns off the sensor power supply 25 [steps 10 to 12]. ]. In addition, in the combustion control operation during the timed restraint in step 7, when the closing of the hot water tap is detected by the water supply amount sensor 9, the operation shifts to the control operation for stopping the combustion, and the combustion control means 101 causes the electromagnetic proportional valve 11 to operate. The combustion of the burner 2 is stopped by closing the intermittent valve 12, post-purging is performed, and the sensor power supply 25 is turned off [Steps 10-1.
2].

Next, the combustion control after the timed restraint will be described with reference to the flowchart shown in FIG. First, the integrated value M is initialized (M = 0), and the counter A is reset to start counting by the counter A (for example, 3
Minutes) [Steps 13 and 14]. And the CO sensor S
Is read, and it is determined whether or not the detected density value CO at that time is equal to or higher than the set density value CO _CHK [steps 15 and 16].

While the counter A is counting up [Step 17], that is, for three minutes after the counter A starts counting, the detected density value CO of the CO sensor S is read. Concentration value CO
If it is less than _CHK , determine that the combustion state is appropriate,
The above-described proportional control is executed until the hot water tap is closed, and the process returns to step 15 (steps 24 and 19). When the counter A counts up, the integrated value M is initialized (M =
0) to perform the above-described proportional control until the hot-water tap is closed, and return to step 14 [step 1
8, 25, 22].

When the detected density value CO becomes greater than or equal to the set density value CO _CHK , a weighting coefficient F is obtained by multiplying the detected density value CO by a preset weighting coefficient N.
Is integrated to obtain an integrated value M. After proportional control, step 14
Return to [Steps 20, 21, 23, 25, 22].

Steps 13 to 25 are repeatedly executed, and when the integrated value M exceeds the set value M _CHK , if the target rotation speed F of the fan 4 has not been increased beforehand,
After controlling to change the target rotation speed F of the fan 4 to the increase side by the set amount ΔF as shown by the characteristic line L2 in FIG. 8, the flow returns to step 13, and the above-mentioned steps 13 to 25 are repeatedly executed to execute the ventilation. The incomplete combustion due to the shortage of the amount is eliminated to maintain a normal combustion state [Steps 23 and 26,
27]. In this way, if the integrated value M exceeds the set value M _{CH K} after waiting for the set time (about several seconds) even though the flow rate is increased and changed, the flow rate control cannot solve the problem. When it is determined that the combustion state is incomplete, an abnormal display (the LED lamp 16 blinks) is performed, and the operation lock unit 105 is operated to prohibit the control based on the control command from the operation unit R [steps 28 and 29]. . Specifically, a signal line from the operation unit R to the control unit H is cut off by a relay or the like. Then, based on the combustion continuation time from the start of combustion measured by the timer 106 to the time when the integrated value M exceeds the set value M _CHK , the post-purge operation time (first setting) is set so as to be longer as the time is longer. Time T
After setting (1) [Step 31], the process shifts to the above-described combustion stop control operation, executes post-purge until the first set time T1 has elapsed, and turns off the sensor power [Steps 11 and 12]. The first set time set here is set to about 10 minutes, and even if the room is contaminated with exhaust gas,
Sufficient forced ventilation can be performed.

When the hot-water tap is closed (corresponding to the combustion stop command) during the repetition of steps 13 to 25, the post-purge operation time is shortened to the second set time T.
2 (about 75 seconds) [Steps 24, 25,
31] Then, the process shifts to the control operation for stopping the combustion described above, post-purge is executed until the set time has elapsed, and the sensor power is turned off [steps 11 and 12].

Next, the post-purge operation control will be described with reference to the flowchart shown in FIG. First, it is determined whether or not incomplete combustion is detected (step 32). If the combustion is not stopped due to incomplete combustion, the fan speed is controlled to be changed to a predetermined value to start post-purge, and the second purge is started.
The ventilation operation is continued until the set time T2 elapses (steps 33, 34, 35). If the hot-water tap is opened even during the execution of the post-purge, the pre-purge time is set to a time shorter than the initial set value, and the process returns to step 3 (steps 34 and 36). If it is determined in step 32 that incomplete combustion has been detected, the post-purge is started by changing the fan speed to a predetermined value, and the post-purge is continued until the first set time T1 has elapsed. [Steps 37 and 3
8].

[Another Embodiment] (1) As means for detecting incomplete combustion of the burner, CO
Instead of the sensor, the oxygen concentration in the exhaust gas may be detected by an O ₂ sensor, and incomplete combustion may be detected based on the detection result. The configuration may be such that incomplete combustion is detected based on the relationship between the amount of air and the amount of combustion supplied by detecting the amount of air and the speed of air. (2) The change setting of the post-purge operation time T1 after the combustion is stopped due to the detection of the incomplete combustion is changed based on the combustion continuation time. The first set time T1 may be changed and set to be longer as the CO gas concentration detected by the sensor is higher. (3) The first set time T1 of the post-purge after the combustion is stopped due to the detection of the incomplete combustion may be fixedly set to a constant value of about 10 minutes instead of being changed and set. (4) Also, the control of the target rotational speed increase amount in step 26 of the control flowchart in the above-described embodiment is replaced with the control of increasing the target rotational speed by the preset value ΔF,
A configuration may be adopted in which the detected concentration CO of the sensor S is increased a small number of times while monitoring the detected concentration CO. (5) When the incomplete combustion state is detected, the amount of fuel supplied to the burner may be reduced instead of increasing the amount of ventilation by the fan. That is, steps 26 and 27 of the control flowchart in the above embodiment are replaced with steps 26a and 27 as shown in FIG.
The control is performed such that the control target value of the combustion supply amount in the above-described proportional control is reduced by ΔIp instead of a. (6) In the above-described embodiment, the airflow amount of the ventilation means is increased or the fuel supply amount to the burner is decreased in accordance with the detection of incomplete combustion. However, such change control is performed. Instead, the combustion of the burner may be stopped as soon as incomplete combustion is detected, and the post-purge may be performed. (7) Instead of a fan for supplying combustion air, a combustion device using an exhaust suction fan may be used.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing the overall configuration of a combustion device.

FIG. 2 is a schematic diagram showing the entire structure of a sensor.

FIG. 3 is a graph showing a change in an output value of a sensor with respect to a CO concentration.

FIG. 4 is a graph showing a time change of an output value of a sensor.

FIG. 5 is a flowchart of a control operation.

FIG. 6 is a flowchart of a control operation.

FIG. 7 is a flowchart of a control operation.

FIG. 8 is a change characteristic diagram of a combustion supply amount and a target rotation speed.

FIG. 9 is a flowchart of a control operation according to another embodiment.

[Explanation of symbols]

 2 burner 4 ventilation means 5 exhaust path H control means S incomplete combustion detection means R operation command means 106 timekeeping means

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Kamiya 1-152 Oka, Minami-ku, Minato-ku, Osaka-shi, Osaka Inside Harman Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) F23N 5 / twenty four

Claims (7)

(57) [Claims] A ventilation means (4) for ventilating combustion air to a burner (2) and discharging a combustion gas to the outside through an exhaust path (5), and detects incomplete combustion of the burner (2). And an incomplete combustion detecting means (S) for stopping the combustion of the burner (2) and stopping the combustion of the burner (2) when a command to stop the combustion is issued. (4) executing post-purging for continuing the operation of (4) for a predetermined time, and performing the incomplete combustion detecting means (S);
Is a combustion device provided with control means (H) for stopping combustion of the burner (2) when detecting incomplete combustion, wherein the control means (H) comprises: )
A combustion device configured to stop combustion of the burner (2) when the incomplete combustion is detected and to execute the post-purge. 2. A ventilation means (4) for ventilating combustion air through a burner (2) and discharging a combustion gas to the outside through an exhaust passage (5), and detects incomplete combustion of the burner (2). And an incomplete combustion detecting means (S) for stopping the combustion of the burner (2) and stopping the combustion of the burner (2) when a command to stop the combustion is issued. (4) executing post-purging for continuing the operation of (4) for a predetermined time, and performing the incomplete combustion detecting means (S);
Is a combustion device provided with control means (H) for stopping combustion of the burner (2) when detecting incomplete combustion, wherein the control means (H) comprises: )
Detecting the incomplete combustion, the ventilation means (4)
When the incomplete combustion detection means (S) detects incomplete combustion despite the increase and change in the amount of ventilation of the burner, the combustion of the burner (2) is stopped. And a combustion device configured to perform the post-purge. 3. A ventilation means (4) for ventilating combustion air through a burner (2) and discharging combustion gas to the outside through an exhaust passage (5), and detects incomplete combustion of the burner (2). And an incomplete combustion detecting means (S) for stopping the combustion of the burner (2) and stopping the combustion of the burner (2) when a command to stop the combustion is issued. (4) executing post-purging for continuing the operation of (4) for a predetermined time, and performing the incomplete combustion detecting means (S);
Is a combustion device provided with control means (H) for stopping combustion of the burner (2) when detecting incomplete combustion, wherein the control means (H) comprises: )
Detects the incomplete combustion, reduces the amount of combustion supply to the burner (2), and despite the fact that the amount of combustion supply decreases, the incomplete combustion detection means (S) A combustion device configured to stop combustion of the burner (2) when the incomplete combustion is detected and execute the post-purge. 4. The post-purging time, which is executed when the incomplete combustion detecting means (S) detects incomplete combustion, is executed when a command to stop combustion is issued. 4. The combustion apparatus according to claim 1, wherein the combustion time is longer than the post-purge time. 5. A time measuring means (106) for measuring a combustion continuation time of said burner (2) is provided, and said control means (H) detects incomplete combustion by said incomplete combustion detecting means (S). When the post-purge time to run,
The combustion apparatus according to claim 1, 2, 3, or 4, wherein the longer the duration of the combustion, the longer the setting based on the timing information of the timing means (106). 6. The incomplete combustion detection means (S) comprises a CO gas sensor for detecting the concentration of CO gas in the combustion gas, and the control means (H) controls the incomplete combustion detection means (S). 3.) The method according to claim 1, wherein the post-purge time to be executed when the incomplete combustion is detected is set longer as the CO gas concentration is higher, based on the detection information of the CO gas sensor. 5. The combustion device according to 2, 3, or 4. 7. The control means (H) based on an artificial operation.
An operation command means (R) for instructing the start of combustion is provided to the control unit, and the control means (H) terminates the post-purge after the incomplete combustion detection means (S) detects incomplete combustion. The control based on the operation command from the operation command means (R) is prohibited until the operation is performed.
7. The combustion device according to 5 or 6.