JP2820892B2 - 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 a combustion device such as a gas water heater, and more particularly to a combustion device provided with a device for detecting a defect such as incomplete combustion.

[0002]

2. Description of the Related Art Conventionally, as this type of apparatus, for example,
There is known a gas water heater in which a burner is housed in a combustion chamber and a combustion fan for blowing combustion air to the burner is provided. The gas water heater is provided with combustion control means for controlling the combustion of the burner and fan control means for controlling the drive of the combustion fan, and when the combustion control means stops the combustion of the burner. The fan control means stops the combustion fan after performing post-purging for a predetermined time after the combustion is stopped.

[0003] Originally, about 5 to 10 seconds after the stop of the combustion is sufficient for the post-purge. However, in the case of the gas water heater, after the combustion of the burner is once stopped, it is often ignited again within a short time. In such a case, the drive of the combustion fan is performed as described above. If the burner is stopped only after continuing for about 5 to 10 seconds from the stop of combustion, when the burner is re-ignited,
There is a problem that it takes time until the rotation speed of the combustion fan reaches a predetermined rotation speed.

Therefore, usually, the fan control means includes:
When performing the post-purge, the combustion fan is turned off after performing the post-purge for 4 to 5 minutes after stopping the combustion of the burner, in case combustion of the burner once stopped is restarted within a short time. It is set to stop.

When incomplete combustion occurs during the combustion, carbon monoxide (CO) gas may be generated. Therefore, the combustion fan is driven for as long as possible in order to diffuse the CO gas. Preferably, after the burner is stopped, the combustion fan is driven for 4 to 5 minutes, so that the CO gas concentration is reduced to a level that does not substantially affect the CO gas concentration. Further, when the burn-out occurs during the combustion,
Since the raw gas has been released, it is desirable to drive the combustion fan for as long as possible to diffuse the raw gas. As in the case of the incomplete combustion, the combustion fan is turned off for 4 to 5 minutes after the burner is stopped. By driving, the concentration of the raw gas is reduced to a level having substantially no effect.

Therefore, in the case of incomplete combustion or extinguishing, post-purge for 4 to 5 minutes is performed in the same manner as in the case of the usual stop of the burner, so that the combustion from the stop of the burner to the stop of the combustion fan is performed. It is not necessary to set the time independently, which is advantageous.

However, when various abnormalities occur as described above, the time from the detection of the abnormality to the stop of the combustion fan is set in the same manner as in the case of the normal post-purge after the burner is stopped. In addition, even when an abnormality occurs in the combustion fan, there is a disadvantage that power is supplied to the combustion fan for a long time.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved combustion device.

That is, an object of the present invention is to provide a combustion apparatus which solves such inconveniences and adjusts the driving time of a combustion fan after the detection of a failure when the failure is detected. .

[0010] More specifically, an object of the present invention is to provide a combustion device which distinguishes between incomplete combustion and abnormality of a combustion fan and immediately stops the combustion fan when abnormality of the combustion fan is detected. It is in.

[0011]

In order to achieve the above object, a combustion apparatus according to the present invention comprises a combustion chamber containing a burner, a combustion fan for blowing combustion air to the burner,
Combustion control means for controlling combustion of the burner; incomplete combustion detection means for detecting incomplete combustion of the burner; fan abnormality detection means for detecting an abnormality of the combustion fan; A combustion stopping means for stopping combustion of the burner when an abnormality of the combustion fan is detected, and controlling the driving of the combustion fan, and when the combustion of the burner is stopped by the combustion control means or the combustion stopping means. In a combustion device comprising fan control means for stopping the combustion fan after a predetermined time, when an abnormality of the combustion fan is detected, a time period from the detection of the abnormality to the stop of the combustion fan is determined by detecting the incomplete combustion. It is characterized in that fan stop time setting means for setting shorter than the case is provided. Further, the present invention is applied to a combustion device such as a gas water heater.

[0012]

According to the combustion apparatus of the present invention, in the normal case where the combustion of the burner is stopped by the combustion control means, post-purge is performed for a predetermined time preset by the fan control means. After that, the combustion fan is stopped.

On the other hand, when incomplete combustion is detected,
After the post-purge for a predetermined time is performed, the combustion fan is stopped, and when abnormality of the combustion fan is detected,
The combustion fan is stopped in a shorter time than when the incomplete combustion is detected.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a combustion apparatus according to the present invention. FIG. 1 is an explanatory sectional view of a gas water heater which is a combustion device of the present embodiment, and FIG. 2 is a block diagram showing a configuration of a main control device of the gas water heater shown in FIG. 1, and FIGS. Is a flowchart showing the operation of the gas water heater of the present embodiment.

As shown in FIG. 1, a forced-combustion gas water heater A includes a gas burner 2 for performing combustion in a combustion chamber 1, an intake port 3 for combustion air X below, and a combustion exhaust gas above. An exhaust port 4 for discharging Z to the outside is provided. Then, the combustion air X of the gas burner 2 is supplied to the combustion chamber 1 by a combustion fan 5 having turbo-type blades provided in the air supply port 4. Above the gas burner 2 in the combustion chamber 1, a heat exchanger 6 is provided.

The gas burner 2 includes a burner group 7 for forming a flame, and a nozzle pipe 9 located below the burner group 7 and having an ejection port 8 so that the fuel gas Y is supplied through the gas pipe 10. Has become.

The water heater A is provided with a main controller 11 for controlling the supply and stop of the fuel gas Y to the gas burner 2, the ignition of the gas burner 2, the stop of the combustion of the gas burner 2, and the driving of the combustion fan 5. And a water sensor 1 on the input side
3, a thermistor 14, a frame rod 19, and a CO sensor 20 are connected. On the output side, a source gas solenoid valve 15, a main solenoid valve 16, a governor type gas proportional solenoid valve (hereinafter abbreviated as a proportional valve) 17, and an igniter 18. Is connected.

As shown in FIG. 2, the main controller 11 controls the combustion of the gas burner 2 by the water amount sensor 13, thermistor 14, original gas solenoid valve 15, main solenoid valve 16, proportional valve 17, igniter 18, and frame rod 19. Combustion control means 21 for controlling the CO in the exhaust gas Z detected by the CO sensor 20
Incomplete combustion detecting means 22 for detecting incomplete combustion of the gas burner 2 based on the concentration, extinction detecting means 23 connected to the frame rod 19 for detecting the flame of the gas burner 2 and detecting extinction, and driving of the combustion fan 5 , And abnormality detecting means 25 for detecting abnormality of the combustion fan 5 and the like. The abnormality detecting means 2
5 is a failure of a device such as the combustion control means 21 before the start of combustion,
Combustion control means 21 after combustion starts, incomplete combustion detection means 2
A failure of the device such as 2 and the extinguishing detecting means 23 and a poor ignition of the gas burner 2 are also detected as abnormalities of the device.

The main controller 11 is connected to the incomplete combustion detecting means 22, the extinguishing detecting means 23 and the abnormality detecting means 25, and when a fault is detected by each of the means 22, 23, 25, the fuel gas is detected. Means for stopping the supply of gas and stopping the combustion of the gas burner 2, and in response to the failure detected by the means 22, 23, 25, the drive time of the combustion fan 5 after the failure detection (post-purge And a fan stop time setting means 27 for setting the time.

The fan stop time setting means 27 is connected to a four-minute timer 28 and a five-second timer 29 which are selected according to the type of the problem, and the timers 28 and 29 are connected to the fan control means 24. Further, the combustion control means 21 is connected to a fan stop time setting means 27 for post-purging during normal combustion stop.

Next, the operation of the water heater A having the above configuration will be described with reference to FIGS.

First, as shown in FIG. 3, the operation switch is turned on.
When the hot water tap (not shown) is opened in the state described above, the operation of the water heater A is started. When the hot water tap is opened,
The water amount sensor 13 is turned on, and then the fan control means 24 is operated by the combustion control means 21 so that the combustion fan 5 starts rotating. Then, the abnormality detecting means 25 detects the presence or absence of an abnormality in the combustion fan 5 and the presence or absence of an abnormality in an initial state of each unit of the apparatus.

The presence or absence of an abnormality in the combustion fan 5 is detected based on whether or not the combustion fan 5 reaches a predetermined rotation speed.
The abnormality of the combustion fan 5 detected here may be the air supply port 3 or the exhaust port 4 closed in addition to the abnormality of the combustion fan 5 itself. Abnormalities in the initial state of each part of the device include circuit abnormalities of solenoid valves such as the original gas solenoid valve 15, the main solenoid valve 16, and the proportional valve 17, and the O of the frame rod 10.
N failure, abnormal temperature fuse not shown, thermistor 1
There are 4 abnormalities.

When it is confirmed that there is no abnormality in the initial state of the combustion fan 5 and the various parts of the apparatus, the igniter 18 is turned on by the combustion control means 21, and subsequently the original gas solenoid valve 15,
The main solenoid valve 16 is turned on, and the proportional valve 17 is opened to a predetermined opening to start supplying the fuel gas, and the gas burner 2 is ignited. When the gas burner 2 is ignited and the flame is detected by the frame rod 19, the igniter 18 is turned off, the CO sensor 20 is subsequently turned on, and the combustion of the gas burner 2 is started.

The combustion of the gas burner 2 is detected by the abnormality detecting means 2.
5. If no abnormalities, incomplete combustion or extinguishing of the apparatus are detected by the incomplete combustion detecting means 22 or the extinguishing detecting means 23, the operation is continued until the hot water tap is closed. Here, in addition to the abnormality of the combustion fan 5 itself, if the continuous combustion limiter (not shown) detects that the combustion has continued for 60 minutes or more, the thermistor 14 and the CO sensor 20 There may be an abnormality in itself, a case where the temperature detected by the thermistor 14 becomes 95 ° C. or more, and a boiling prevention device (not shown) is activated. During the combustion of the gas burner 2, proportional control of the fuel gas supplied by the proportional valve 17 is performed.

When the hot water tap is closed, the water quantity sensor 13 is turned off, so that the original gas solenoid valve 15,
The main solenoid valve 16 and the proportional valve 17 are turned off, and a signal is sent to the fan stop time setting means 27. In this case, normal combustion is stopped, and the 4-minute timer 28 is operated.
In the case of the normal combustion stoppage, if the hot water tap is opened while the 4-minute timer 28 is operating, the original gas solenoid valve 1 is again activated.
5 and the main solenoid valve 16 are turned on and the igniter 18
Is turned on, and the operation of the water heater A is started. Also, when the 4-minute timer 28 times out without opening the hot water tap, the rotation of the combustion fan 5 is stopped by the fan control means 24, then the CO sensor 20 is stopped, and the operation switch is turned off. The operation of the vessel A ends.

Next, the operation when a malfunction is detected during the combustion of the gas burner 2 in FIG. 3 will be described with reference to FIGS.

First, as shown in FIG. 3, during the combustion of the gas burner 2, when an abnormality, incomplete combustion or extinguishing of a device such as the combustion fan 5 is detected, the abnormality detecting means 25 and the incomplete combustion detecting means 22 are detected. Alternatively, a signal is sent from the extinction detecting means 23 to the combustion stopping means 26.

Next, as shown in FIG. 4, the combustion stopping means 26 sets the proportional valve 17, the main solenoid valve 16, and the original gas solenoid valve 15 to O.
By stopping the supply of the fuel gas by performing FF, the combustion of the gas burner 2 is stopped and a signal is sent to the fan stop time setting means 27. In the case of the disappearance, the supply of the fuel gas is stopped by the combustion stopping means 26, and the release of the raw gas is stopped.

Next, the fan stop time setting means 27 activates the 4-minute timer 28 in response to the signal received from the combustion stopping means 26 when the failure is incomplete combustion or disappears, and the apparatus such as the combustion fan 5 is operated. In the case of the abnormality, the 5-second timer 29 shorter than that is operated.

The 4-minute timer 28 or the 5-second timer 29
When the time is up, the fan control means 24 stops the rotation of the combustion fan 5. Next, the operation switch is set to O
By performing the FF, the operation of the water heater A ends.

Next, the operation in the case where an abnormality of the apparatus is detected before the igniter 18 is turned on in FIG. 3 will be described with reference to FIGS.

As shown in FIG. 3, when an abnormality of the combustion fan 5 or an abnormality of each part of the apparatus is detected in the initial state by the abnormality detecting means 25 following the start of rotation of the combustion fan 5,
At this time, since the supply of the fuel gas has not been started yet, the signal from the abnormality detecting means 25 is sent directly to the fan stop time setting means 27 without passing through the combustion stopping means 26. Since the malfunction in this case is an abnormality of the apparatus such as the combustion fan 5, the fan stop time setting means 27 activates the 5-second timer 29 shorter than that when the malfunction is incomplete combustion as shown in FIG.

When the 5-second timer 29 times out, the fan control means 24 stops the rotation of the combustion fan 5. Next, when the operation switch is turned off, the operation of the water heater A ends.

Next, the operation when the ignition failure is detected in FIG. 3 will be described with reference to FIGS.

As shown in FIG. 3, when the abnormality detection means 25 detects an ignition failure of the gas burner 2, first, as shown in FIG. 6, it is determined whether the ignition failure is a predetermined number of times or more. You. If the ignition failure is, for example, two times or less, the abnormality detection means 25 does not regard the ignition failure as an abnormality of the apparatus, increases the rotation of the combustion fan 5, and repeats the ignition operation below the igniter ON in FIG. 3 again. .

When the ignition failure exceeds two times, the abnormality detection unit 25 detects the ignition failure as an abnormality of the apparatus for the first time and sends a signal to the combustion stopping unit 26. Then, the combustion stopping means 26 operates the proportional valve 17 and the main solenoid valve 1.
6. The combustion of the gas burner 2 is stopped by turning off the source gas solenoid valve 15 to stop the supply of the fuel gas, and a signal is sent to the fan stop time setting means 27.

At the time of the ignition failure, the supply of the fuel gas is started, but the amount is very small, so that the combustion fan 5 may be driven only for a time period in which the combustion chamber 1 can be ventilated. Raw gas can be sufficiently diffused in the time for the original post-purge. Therefore, the fan stop time setting means 27 activates the 5-second timer 29, and when the 5-second timer 29 times out, the fan control means 24 stops the rotation of the combustion fan 5 as shown in FIG. Next, when the operation switch is turned off, the water heater A
The operation of is ended.

As described above, in this embodiment, when the failure is incomplete combustion or extinguishment, the four-minute timer 28, which is the same as the time from the normal stop of the gas burner 2 to the stop of the combustion fan 5, is operated. It is made to let. In the case of incomplete combustion or extinguishing, it is desirable that the time from the detection of the failure to the stop of the combustion fan 5 be long in order to release and diffuse the CO gas or the raw gas. If 5 is driven for about 4 minutes, CO
Because the concentration of gas or raw gas can be reduced to a level that has substantially no effect.

Therefore, when the failure is incomplete combustion or extinguishes as in this embodiment, after the gas burner 2 is stopped, the 4-minute timer 28, which is the same as the normal post-purge time, is used.
Is operated, it is not necessary to provide independent timers when incomplete combustion or extinguishing is detected.

On the other hand, if the problem is ignition failure of the gas burner 2, the 5-second timer 29 is operated. This is the gas burner 2 at this point
Since the combustion of the raw gas has not been started and the released raw gas is extremely small, it is not necessary to drive the combustion fan 5 for a longer time than in the case of the incomplete combustion or extinguishing, and the raw gas is not This is because the exhaust gas can be sufficiently diffused in the time for purging.

When the malfunction is an abnormality of the combustion fan 5 itself, it is desired to stop the combustion fan 5 in an abnormal state promptly without driving for a long time. Therefore, as in the present embodiment, a 5-second timer 29 shorter than that in the case of incomplete combustion is operated.

When the abnormality of the combustion fan 5 is detected, the rotation of the combustion fan 5 may be stopped immediately. For this purpose, the abnormality detection means 25 or the fan stop time setting means 27 is provided to the fan control means 24. Must be directly connected. However, according to the present embodiment, the rotation of the combustion fan 5 can be stopped within a short time of 5 seconds after the abnormality of the combustion fan 5 is detected, and substantially immediately after the abnormality is detected. As a result, the same effect as stopping the rotation of the combustion fan 5 can be obtained, and further, the connection as described above is not required, and the apparatus configuration can be simplified.

In this embodiment, when the malfunction is an abnormality of a device other than the combustion fan 5, the 5-second timer 29 is operated to stop the combustion fan 5, so that the abnormality Is notified by stopping the combustion fan 5 and the user can be immediately recognized. In this case, similarly to the case of the abnormality of the combustion fan 5, the rotation of the combustion fan 5 may be stopped immediately after the abnormality of the device is detected, as in the present embodiment. By doing so, an effect equivalent to stopping the rotation of the combustion fan 5 substantially immediately after the detection of the abnormality can be obtained, and an independent timer is not required for this case, so that the apparatus configuration is simplified. be able to.

[0045]

As is apparent from the above, according to the combustion apparatus of the present invention, incomplete combustion is distinguished from abnormalities of the combustion fan. The combustion fan can be stopped in a shorter time than when combustion is detected, and the combustion fan in which an abnormality has occurred can be driven for a long time to prevent damage to the combustion fan.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing a configuration of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a main control device of the combustion device shown in FIG.

FIG. 3 is a flowchart showing the operation of the combustion device shown in FIG. 1;

FIG. 4 is a flowchart showing the operation of the combustion device shown in FIG. 1;

FIG. 5 is a flowchart showing the operation of the combustion device shown in FIG. 1;

FIG. 6 is a flowchart showing the operation of the combustion device shown in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... combustion chamber, 2 ... burner, 5 ... combustion fan, 21 ... combustion control means, 22 ... incomplete combustion control means, 24 ... fan control means, 25 ... fan abnormality detection means, 26 ... combustion stop means, 27 ... fan Stop time setting means.

Claims (2)

(57) [Claims] 1. A combustion chamber containing a burner, a combustion fan for blowing combustion air to the burner, combustion control means for controlling combustion of the burner, and incomplete combustion for detecting incomplete combustion of the burner Detecting means; fan abnormality detecting means for detecting abnormality of the combustion fan; combustion stopping means for stopping combustion of the burner when incomplete combustion of the burner or abnormality of the combustion fan is detected; A fan control means for controlling the driving of the fan and stopping the combustion fan after a predetermined time when the combustion of the burner is stopped by the combustion control means or the combustion stop means. Is detected, fan stop time setting means is provided for setting the time from the detection to the stop of the combustion fan shorter than when the incomplete combustion is detected. A combustion device characterized in that the combustion device is provided. 2. The combustion device according to claim 1, wherein said combustion device is a gas water heater.