JPH07260143A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To reduce contamination in a chamber due to exhaust gas as much as possible even when incomplete combustion is detected. CONSTITUTION:When an incomplete combustion state is detected by a CO sensor S, combustion of a burner 2 is stopped, a ventilation of a fan 4 is so controlled as to be continued for a predetermined time and to discharge exhaust gas out of the room through an exhaust passage 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation means for ventilating combustion air to a burner and discharging combustion gas to the outside through an exhaust passage, and an incomplete combustion detection means for detecting incomplete combustion of the burner. Is provided, when the combustion stop is instructed, the post-purge for continuing the operation of the ventilation unit for a predetermined time even after stopping the combustion of the burner and stopping the combustion of the burner, and, The present invention relates to a combustion device 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 In the above combustion apparatus, when an abnormal state due to incomplete combustion is detected, the operation of the entire apparatus is stopped so that combustion gas having a harmful effect on the human body leaks to the outside of the apparatus. The inside of the room is prevented from being contaminated by combustion gas. When the incomplete combustion as described above occurs, if the exhaust passage is blocked for some reason, if combustion failure due to burner abnormality occurs, combustion gas leaks out of the device,
It is conceivable that a defective combustion may occur due to lack of oxygen due to ventilation of the air containing the combustion gas as combustion air through the burner by the ventilation means. By the way, conventionally, for example, as disclosed in Japanese Unexamined Patent Publication No. Hei 5-26438, when it is determined that the incomplete combustion state, the operation of the entire apparatus, that is, the fuel supply to the burner is stopped, and the ventilation means is operated. It was also configured to stop working.

[0003]

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

[0004]

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

A characteristic configuration of the second invention is that in the combustion apparatus described at the beginning, the control means increases and changes the ventilation amount of the ventilation means as the incomplete combustion detection means detects incomplete combustion. In addition, when the incomplete combustion detection means detects incomplete combustion despite increasing and changing the ventilation amount, the combustion of the burner is stopped and the post purge is executed. There is a point.

The third aspect of the present invention is the combustion apparatus described at the beginning, wherein the control means reduces the combustion supply amount to the burner as the incomplete combustion detection means detects incomplete combustion. When the incomplete combustion detecting means detects incomplete combustion despite the change and the decrease in the combustion supply amount, the combustion of the burner is stopped and the post-purge is executed. It is a point that is configured.

A characteristic feature of the fourth invention is that the control means is
The incomplete combustion detection means is configured so that the time for the post-purge executed when detecting the incomplete combustion is set to be longer than the time for the post-purge executed when the combustion stop is instructed. It is in.

A fifth aspect of the present invention is characterized in that a timing means for measuring the combustion duration of the burner is provided, and the control means executes the post when the incomplete combustion detection means detects incomplete combustion. It is configured such that the purging time is changed and set longer as the combustion duration time is longer, based on the timing information of the timing means.

In a sixth aspect of the present invention, the incomplete combustion detecting means detects C concentration of CO gas in the combustion gas.
An O gas sensor is used, and the control unit sets the time of the post-purge executed when the incomplete combustion detection unit detects incomplete combustion, based on the detection information of the CO gas sensor. The higher is, the longer the change is set.

The characteristic configuration of the seventh aspect of the invention is provided with an operation command means for instructing the control means to start combustion on the basis of an artificial operation, and the control means is such that the incomplete combustion detection means indicates incomplete combustion. The point is that the control based on the operation command from the operation command means is prohibited from the time of detection to the end of the post-purge.

[0011]

According to the characterizing feature of the first invention, when the incomplete combustion of the burner is detected by the incomplete combustion detecting means, the combustion of the burner is stopped and the post-purge is executed.
Even after the combustion of the burner is stopped, the ventilation means continues to operate. Therefore, in a safe state where additional generation of combustion gas is suppressed by stopping combustion, forced ventilation operation (forced ventilation) by the ventilation means is continued, and residual gas generated due to fire extinguishing in the device Not only unburned gas and unburned gas, but also the air in the room is forcibly discharged out of the room through the exhaust passage by the ventilation means.

According to the characterizing feature of the second invention, when the incomplete combustion of the burner is detected by the incomplete combustion detecting means, the ventilation amount by the ventilation means is changed to increase, and thus the ventilation amount increases. If the incomplete combustion state is detected even after the combustion, the burner combustion is stopped and the post-purge is executed, and the ventilation means is continuously operated even after the burner combustion is stopped. Of. Therefore, if 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 the incomplete combustion. When the combustion is detected, the above-mentioned combustion stop operation and the forced exhaust operation (forced ventilation) by the post-purge thereafter are executed.

According to the characterizing feature 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. If an incomplete combustion state is detected even after the amount of combustion has decreased, the combustion of the burner is stopped, post-purge is executed, and the operation of the ventilation means continues even after the combustion of the burner is stopped. It is done. Therefore, even if the incomplete combustion occurs due to a shortage of ventilation due to blockage in the exhaust path, etc., and even if the ventilation by the ventilation means is the maximum and cannot be changed, it corresponds to the small air volume. If the burner combustion state can be returned to the normal combustion state by changing to the fuel supply amount and such incomplete combustion cannot be detected by the change of the fuel supply amount, the combustion as described above is performed. The stop operation and the forced exhaust operation (forced ventilation) by the post-purge after that are executed.

According to the characterizing feature of the fourth aspect of the invention, the post-purge time executed after the combustion stop operation, which is carried out when the incomplete combustion is detected, is the post-purge time executed when the normal combustion stop command is issued. Since it becomes longer, in addition to the forced exhaust of residual fuel gas and unburned gas generated by the combustion stop in the device, which is performed by the post-purge performed in accordance with the normal combustion stop command, the outside of the device [ It is possible to forcibly discharge the combustion gas and the like leaking into the room through the exhaust passage by the ventilation means.

According to the characterizing feature of the fifth aspect of the invention, the post-purge time executed after the combustion stop operation, which is carried out when the incomplete combustion is detected, becomes longer as the combustion continuation time becomes longer. That is, when the combustion gas leaks to the outside of the device, it is considered that the longer the combustion duration is, the more contaminated the entire room is. Therefore, the forced exhaust operation by the ventilation unit is executed accordingly. To be done.

According to the characterizing feature of the sixth aspect of the invention, the incomplete combustion is reasonably and accurately detected by detecting the concentration of CO gas which is the unburned gas in the combustion gas, and the detected gas concentration is The higher the time, the longer the post-purging time that is executed after the combustion stop operation that is performed with the incomplete combustion detection, and therefore the forced ventilation operation by the ventilation unit can be efficiently performed according to the CO gas concentration.

According to the characterizing feature of the seventh aspect of the invention, since the combustion start based on the manual operation is prohibited while the combustion stop and the post-purge are executed in accordance with the detection of the incomplete combustion, the forced ventilation by the ventilation means is performed. Exhaust operation is reliably performed with the burner combustion not started.

[0018]

Therefore, according to the characteristic configuration of the first invention,
When incomplete combustion is detected, forced ventilation with ventilation means is performed in a safe state with the burner combustion stopped, which ensures reliable ventilation in the room and improves safety in use. It has come to be possible to provide a combustion device that can.

According to the characterizing structure of the second invention, while ensuring the above-mentioned safety by the characterizing structure of the first invention,
It is possible to return to the normal combustion state without immediately stopping the combustion.

According to the characterizing structure of the third invention, after securing the above-mentioned safety by the characterizing structure of the first invention,
Even if the ventilation amount by the ventilation unit is the maximum amount and cannot be changed, it is possible to return to the normal combustion state.

According to the characteristic construction of the fourth aspect of the invention, the interior of the device is reliably ventilated by the post-purging for a time longer than the time sufficient for exhausting unburned gas or the like normally generated when the combustion is stopped. It is possible and safety is secured.

According to the characterizing feature of the fifth invention, the forced exhaust operation by the ventilation means can be efficiently performed according to the required amount.

According to the characterizing feature of the sixth invention, the incomplete combustion can be 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 characterizing feature of the seventh aspect of the invention, the forced exhaust operation by the ventilation means associated with the detection of the incomplete combustion is executed in the state where the combustion of the burner is not started. Compared with the case where combustion is started before the end of post-purge after the combustion is stopped, the function of forced ventilation by the ventilation means can be fully exerted, and safety is further enhanced.

[0025]

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

In the water supply passage 6, the amount of water supplied to the heat exchanger 3 Qi
The water supply amount sensor 9 for detecting the
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 gas supply pipe for general households, and the burner 2 is connected to the fuel supply passage 8.
An electromagnetic proportional valve 11 for adjusting the fuel supply amount Ip to the fuel cell and an interrupt valve 12 for interrupting the fuel supply are provided.

The operation unit R is connected to the control unit H by wire or wirelessly, and has 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, and various other types. LE to display information
D lamps 15 and 16 are provided. In addition, LED
The lamp 15 is configured to display whether or not the hot water supply device is operating, and the LED lamp 16 is configured to display whether or not 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 the concentration value CO of the unburned component contained in the combustion gas of the burner 2. Figure 2
Shows the configuration of this CO sensor S. CO
The sensor S is the pedestal 2 inside the protective frame 21 made of stainless steel.
2 includes a sensor element 23 and a temperature compensating reference element 24.
Are equipped with. Each of the sensor element 23 and the temperature compensating reference element 24 is composed of a platinum wire tanned with a catalyst, and is heated to about 200 ° C. by the flow of an electric current, and the unburned gas in the combustion gas contacting the surface thereof is heated. The components burn catalytically. At this time, since the catalyst tangled in 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 becomes large, the difference between the resistance values of the sensor element 23 and the temperature compensating reference element 24 becomes large. Therefore, the CO concentration in the combustion gas can be detected as a difference in resistance value (sensor output V). In the figure, 25 is a control unit H
It is a connector part with the lead wire connected to. Figure 3
The output V of the CO sensor S with respect to the CO concentration in the combustion gas
Indicates.

The control section H includes a combustion control means 101 for controlling the combustion operation of the water heater A, an incomplete combustion determination means 102 for determining an incomplete combustion state based on the detected concentration value CO of the CO sensor S, During the set time T after the start of combustion of the burner 2, the time limit check means 103 for checking the operation of the incomplete combustion determination means 102, and the post purge time for setting the operation time of the ventilation operation [post purge] performed after the combustion operation is stopped. A setting means 104, an operation lock means 105 for disabling an operation command from the operation unit R after the incomplete combustion state is determined by the incomplete combustion determination means 102, and a timing for measuring the combustion operation time from the start of combustion by the burner. Means 10
And 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 hot water supply operation. In the hot water supply operation, basically, the solenoid proportional valve 11 is adjusted to adjust the fuel supply amount Ip of the burner 2 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. The target rotation speed F determined by the rotation speed of the fan 4 with respect to the fuel supply amount Ip, for example, 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 this hot water supply operation is called proportional control.

When the detected concentration value CO of the CO sensor S is equal to or higher 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.
Depending on O, the detected concentration value CO is multiplied by a weighting coefficient N with a greater weight as the detected concentration value CO is increased to obtain a weighted value F (F = N × CO), and the weighted value F is obtained. Is integrated, and when 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 interrupt the fuel supply to the burner 2 and stop the combustion as the incomplete combustion state is determined. Moreover, the LED lamp 16 is configured to be informed (abnormality display) of blinking the incomplete combustion state.

The weighting coefficient N is set in advance in correspondence with the detected concentration value CO such that the larger the detected concentration value CO, the larger the value.

Incidentally, 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 indicated by time t1. The sensor output V is initially
In the state where the combustion is stopped (before the time t1), the output value V1 peculiar 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 (C
O) temporarily becomes very high, so the output value V once becomes very high. Then, when the combustion of the burner 2 becomes stable, the concentration (CO) of the unburned component decreases, so the output value V becomes low and the output value V2 indicating a steady combustion state.
Converge to.

Therefore, the time limit checking means 103 prevents the incomplete combustion determining means 102 from determining the transient incomplete combustion state immediately after the start of combustion as abnormal so that the set time T after the start of combustion of the burner 2 (for example, 60). After the elapse of seconds), the incomplete combustion discriminating means 102 is activated. That is, the operation of the incomplete combustion determination means 102 is restrained 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 stops the combustion based on the detection of the incomplete combustion state. In case of, it is set to be long.

The control operation of the hot water supply apparatus of this embodiment will be described below with reference to the flow chart shown in FIG.
First, when opening of the hot water supply tap is detected by the water supply amount sensor 9, the sensor power supply 25 is turned on, and the time restraint means 103.
The timed restraint of the incomplete combustion determination means 102 is started [steps 1 to 3]. Then, the air blowing (pre-purge) of the fan 4 is started, and the combustion control means 101 starts the combustion of the burner 2 [steps 4 and 5]. That is,
The spark by the igniter 30 is started, and the solenoid proportional valve 1
1 and the on-off valve 12 are opened to start combustion. Burner 2
Flame rod 31
Is detected by. Further, the timing means 106 starts timing with the start of combustion [step 6].

Further, the combustion control (proportional control) during the timed restraint by the timed restraint means 103 is performed [step 7], and when the timed restraint is completed, the incomplete combustion determination means 10
Combustion control (proportional control) accompanied by operation according to 2 is performed [steps 8 and 9]. Therefore, the incomplete combustion determination means 102 is prevented from operating while the timed restraint means 103 is operating.

When the combustion control after the time limit check is completed, the control operation of the combustion stop is started. In the control operation for stopping the 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 the post-purge, and turns off the sensor power supply 25 [steps 10 to 12]. ]. In the combustion control operation during the timed check in step 7, when the hot water supply plug is detected by the water supply amount sensor 9, the control shifts to the combustion stop control operation, and the combustion control means 101 causes the electromagnetic proportional valve 11 to operate. The on / off valve 12 is closed to stop the combustion of the burner 2, post-purge is performed, and the sensor power supply 25 is turned off [steps 10 to 1].
2].

Next, the combustion control after the timed check will be described with reference to the flowchart shown in FIG. First, the integrated value M is initialized (M = 0), and then 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
The detected concentration value CO is read, and it is determined whether or not the detected concentration value CO at that time is equal to or higher than the set concentration value CO _CHK [steps 15 and 16].

While the counter A is counting up [step 17], that is, the detected concentration value CO of the CO sensor S is read for 3 minutes after the counter A starts counting, the detected concentration value CO during that period is set. Concentration value CO
If it is less than _CHK , it is judged that the combustion state is appropriate,
The proportional control as described above 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) is performed, the proportional control as described above is executed until the hot water tap is closed, and the process returns to step 14 [step 1
8, 25, 22].

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

When the integrated value M exceeds the set value M _CHK by repeating the above steps 13 to 25, if the target rotational speed F of the fan 4 has not been increased before,
As shown by the characteristic line L2 in FIG. 8, the target rotational speed F of the fan 4 is controlled so as to be increased by the set amount ΔF, and then the process returns to step 13 and the above steps 13 to 25 are repeatedly executed to perform ventilation. Incomplete combustion due to insufficient amount is eliminated to maintain a normal combustion state [steps 23, 26,
27]. In this way, even if the ventilation amount is increased, if the integrated value M exceeds the set value M _{CH K} after waiting for the setting time (about several seconds), it cannot be solved by the ventilation amount control. When it is determined that the combustion is incomplete, an abnormality is displayed (the LED lamp 16 blinks), the operation lock means 105 is activated, and control based on the control command from the operation unit R is prohibited [steps 28 and 29]. . Specifically, the 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 measured from the combustion start time measured by the time counting means 106 until the integrated value M exceeds the set value M _CHK , the operating time of the post-purge (first setting) becomes longer as the time increases. Time T
After setting 1) [step 31], the control operation of the combustion stop is performed, post-purge is executed until the first set time T1 elapses, and the sensor power supply is turned off [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 will be possible.

When the hot water tap is closed (corresponding to the combustion stop command) while the above steps 13 to 25 are repeatedly executed, the post purge operation time is shortened to the second set time T.
After setting to 2 (about 75 seconds) [Steps 24, 25,
31], the above-described combustion stop control operation is performed, post-purge is executed until the set time elapses, and the sensor power supply is turned off [steps 11 and 12].

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

[Other Embodiment] (1) As a means for detecting incomplete combustion of a burner, CO
Instead of the sensor, an O ₂ sensor may be used to detect the oxygen concentration in the exhaust gas, and incomplete combustion may be detected based on the detection result. The configuration may be such that the air volume and the air velocity are detected, and the incomplete combustion is detected from the relationship between these and the combustion supply amount. (2) Instead of changing the setting of the post-purge operation time T1 after the combustion is stopped due to the incomplete combustion detection, the post-purge operation time T1 is changed based on the combustion continuation time. The higher the CO gas concentration detected by the sensor, the longer the first set time T1 may be set. (3) The first set time T1 of the post-purge after the combustion is stopped due to the incomplete combustion detection may be fixed and set to a constant value of about 10 minutes instead of being changed and set. (4) Further, the control of the target rotational speed increase amount in step 26 of the control flow chart in the above embodiment is replaced with the one in which the preset value ΔF is increased, instead of the CO
The detected concentration CO of the sensor S may be increased little by little while being monitored multiple times. (5) When the incomplete combustion state is detected, the amount of fuel supplied to the burner may be decreased instead of increasing the amount of ventilation by the fan. That is, the steps 26 and 27 of the control flow chart in the above embodiment are replaced with the steps 26a and 27 as shown in FIG.
Instead of a, the control target value of the combustion supply amount in the above-mentioned proportional control is controlled to decrease by ΔIp. (6) In the above embodiment, the change of the ventilation amount of the ventilation unit or the decrease of the fuel supply amount to the burner is changed in accordance with the detection of the incomplete combustion, but such change control is performed. Instead, the combustion of the burner may be stopped immediately after the incomplete combustion is detected, and the post purge may be performed. (7) Instead of the fan that supplies the combustion air, a combustion device that uses an exhaust suction fan may be used.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

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

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

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

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

FIG. 5 is a flowchart of control operation

FIG. 6 is a flowchart of control operation

FIG. 7 is a flowchart of control operation

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

FIG. 9 is a flowchart of control operation of 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 timing means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Kamiya 1-1-52 Oka, Minami-shi, Minato-ku, Osaka City, Osaka Prefecture Herman Co., Ltd.

Claims (7)

[Claims] 1. Ventilation means (4) for ventilating combustion air through a burner (2) and exhausting combustion gas to the outside through an exhaust passage (5), and detecting incomplete combustion of the burner (2). And an incomplete combustion detection means (S) for stopping the combustion of the burner (2) and stopping the combustion of the burner (2) when the combustion stop is instructed. The post-purge for continuing the operation of 4) for a predetermined time is executed, and the incomplete combustion detecting means (S).
Is a combustion device provided with a control means (H) for stopping the combustion of the burner (2) when the incomplete combustion detection means (S). )
A combustion device configured to stop the combustion of the burner (2) and execute the post-purge when the incomplete combustion is detected. 2. Ventilation means (4) for ventilating combustion air to a burner (2) and discharging combustion gas to the outside through an exhaust passage (5), and detecting incomplete combustion of the burner (2). And an incomplete combustion detection means (S) for stopping the combustion of the burner (2) and stopping the combustion of the burner (2) when the combustion stop is instructed. The post-purge for continuing the operation of 4) for a predetermined time is executed, and the incomplete combustion detecting means (S).
Is a combustion device provided with a control means (H) for stopping the combustion of the burner (2) when the incomplete combustion detection means (S). )
With the incomplete combustion detected, the ventilation means (4)
The combustion amount of the burner (2) is stopped when the incomplete combustion detection means (S) detects the incomplete combustion even though the ventilation amount of the air is increased. And a combustion device configured to perform the post-purge. 3. Ventilation means (4) for ventilating combustion air to the burner (2) and exhausting combustion gas to the outside through an exhaust passage (5), and incomplete combustion of the burner (2) is detected. And an incomplete combustion detection means (S) for stopping the combustion of the burner (2) and stopping the combustion of the burner (2) when the combustion stop is instructed. The post-purge for continuing the operation of 4) for a predetermined time is executed, and the incomplete combustion detecting means (S).
Is a combustion device provided with a control means (H) for stopping the combustion of the burner (2) when the incomplete combustion detection means (S). )
Detecting the incomplete combustion, the combustion supply amount to the burner (2) is reduced and changed, and the incomplete combustion detection means (S) is used even though the combustion supply amount is reduced and changed. When the incomplete combustion is detected, the combustion apparatus is configured to stop the combustion of the burner (2) and execute the post-purge. 4. The control means (H) executes the post-purge time executed when the incomplete combustion detection means (S) detects incomplete combustion when a combustion stop is instructed. The combustion device according to claim 1, 2 or 3, which is configured to be longer than the post-purge time. 5. A timer means (106) for measuring the combustion duration of the burner (2) is provided, and the control means (H) detects the incomplete combustion by the incomplete combustion detection means (S). When to perform the post-purge time,
The combustion apparatus according to claim 1, 2, 3, or 4, wherein the combustion duration is changed and set longer as the combustion duration is longer, based on the timing information of the timing means (106). 6. The incomplete combustion detection means (S) is composed of a CO gas sensor for detecting the CO gas concentration in the combustion gas, and the control means (H) is the incomplete combustion detection means (S). ) Is configured to change and set the post-purge time to be executed when the incomplete combustion is detected based on the detection information of the CO gas sensor, as the CO gas concentration increases. The combustion device according to 2, 3, or 4. 7. The control means (H) based on human operation.
Is provided with operation command means (R), and the control means (H) ends the post-purge from when 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 time is reached.
The combustion device according to 5 or 6.