JP3784155B2 - Combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention executes a normal ignition process for performing an ignition operation to the burner after operating the ventilation means for a normal set time when there is an ignition command, a ventilation means for passing combustion air to the burner, and an ignition command In addition, when the burner is not ignited by the normal ignition process, the ventilation means is operated for a non-ignition setting time longer than the normal setting time, and the work amount in the setting driving state of the ventilation means during the operation is obtained. The present invention relates to a combustion apparatus provided with a control means for determining a ventilation state of combustion air based on this and performing a non-ignition ignition process for performing a re-ignition operation to the burner when the ventilation state is appropriate.
[0002]
[Prior art]
In the combustion apparatus as described above, when there is an ignition command, the normal ignition process is performed to perform the ignition operation to the burner by operating for a relatively short normal set time without operating the ventilation means for a long time. The time from the command to ignition is short, and for example, when applied to a hot water supply device, the rise of the hot water temperature at the start of hot water supply is quickened.
Further, when the normal ignition process is executed, if the burner is not ignited due to a back wind or the like, the non-ignition ignition process is performed to operate the ventilation means for a non-ignition set time longer than the normal set time. At times, the raw gas that has flowed out is completely exhausted, and there is no loud ignition noise due to the residual of the raw gas at the time of reignition. Further, during the operation of the ventilation means during the non-ignition set time, the combustion air It is also possible to determine the ventilation state.
[0003]
Thus, in the conventional combustion apparatus, if the ignition command is continued, the occurrence of non-ignition is memorized and the ignition process for non-ignition is executed, but when the ignition command is released, the non-ignition occurs. When the memory is released and there is an ignition command thereafter, the normal ignition process is executed.
For example, in the case of the hot water supply apparatus described above, an ignition command is commanded along with water flow to the heat exchanger by opening the hot water tap, and the ignition command is released when water flow is stopped by closing the hot water tap. Therefore, when the hot water tap is closed after the occurrence of non-ignition, and then the hot water tap is opened again, the normal ignition process is executed.
[0004]
[Problems to be solved by the invention]
Therefore, in the conventional combustion device, the ignition command is canceled after the non-ignition to the burner has occurred, and then, if there is an ignition command within a short time, the raw gas that has flowed out at the time of non-ignition remains, In addition, the residual gas may not be completely discharged only by the operation of the ventilation means by executing the normal ignition process, and there is a possibility that a loud ignition sound is generated at the time of ignition accompanying the execution of the normal ignition process.
[0005]
The present invention pays attention to such a conventional problem, and its purpose is to generate a large ignition sound due to residual raw gas even when the ignition command is canceled after non-ignition to the burner occurs. It is in providing the combustion apparatus which can prevent generation | occurrence | production reliably.
[0006]
[Means for Solving the Problems]
In order to achieve this object, according to the first aspect of the present invention, when non-ignition of the burner occurs, the occurrence of non-ignition is memorized even if the ignition command is canceled, and ignition is properly performed. A non-ignition memory means for canceling the memory of the occurrence of non-ignition is provided, and when there is an ignition command, the non-ignition occurrence is stored based on the stored information of the non-ignition memory means. Therefore, if the ignition command is canceled after the occurrence of non-ignition and the ignition command is issued after that, the ventilation means is operated for a non-ignition set time longer than the normal set time. .
Therefore, even if the ignition command is canceled immediately after the occurrence of non-ignition, and the ignition command is issued again, the raw gas that has flowed out at the time of non-ignition is completely discharged and then ignited. If there is no loud ignition sound due to residual raw gas, etc., and the non-ignition storage means does not memorize the occurrence of non-ignition, normal ignition processing is executed, so the time from ignition command to ignition is reduced. Generation of a loud ignition sound due to residual raw gas or the like can be reliably prevented without making it unnecessarily long.
[0007]
Further, according to according to the invention described in claim 1, when the setting time has elapsed after the misfire occurs, since it is intended to provide a storage canceling means for canceling the storage of the misfire occurred by misfire storage means, the time elapsed When the raw gas etc. is completely discharged along with this, the normal ignition process is executed based on the ignition command, and the time from the ignition command to ignition can be shortened in a state in accordance with the actual situation. It becomes possible.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The example which applied the combustion apparatus by this invention to the hot water supply apparatus is demonstrated based on drawing.
As shown in FIG. 1, this hot water supply apparatus heats water and supplies hot water supply section K, control section H as a control means for controlling the operation of hot water supply section K, and commands control information to control section H. A remote control operation unit R is provided.
[0010]
The hot water supply section K detects a gas combustion burner 2 in the combustion chamber 1, a heat exchanger 3 heated by the burner 2, an igniter 4 for igniting the burner 2, and whether or not the burner 2 is ignited. A rod 5 and the like are provided. The combustion air is passed through the burner 2, and the fan 6 is provided as a ventilation means whose flow rate can be changed and adjusted, and the rotational speed detection means 6 a that detects the actual rotational speed of the fan 6. Is provided.
[0011]
The heat exchanger 3 is connected with a water inlet 7 through which water is supplied and a hot water outlet 8 through which hot water is discharged to a hot-water tap 8a. The water passage 7 is provided with a water flow sensor 9 for detecting the water flow amount to the heat exchanger 3 and a water inlet temperature thermistor 10 for detecting the water inlet temperature, and the hot water outlet 8 detects the hot water temperature. A warm thermistor 11 is provided. Further, the fuel supply passage 12 for the burner 2 is provided with an electromagnetically operated on-off valve 13 and an electromagnetically operated gas proportional valve 14 whose fuel supply amount can be changed and adjusted.
[0012]
The remote control operation unit R is communicably connected to the control unit H, sets an operation switch 15 for instructing the control unit H to start / stop hot water supply operation, sets a target hot water supply temperature, and instructs the control unit H to A temperature setting switch 16 for displaying, a display unit 17 for displaying a hot water supply temperature, a notification lamp 18, a notification buzzer 19, and the like.
[0013]
The control unit H includes a microcomputer, and includes a combustion control unit 100 that performs normal combustion control during hot water supply, a ventilation state determination unit 101 that determines a ventilation state in a ventilation path of combustion air, and a burner 2. A non-ignition storage means 102 for storing the occurrence of non-ignition, a memory release means 103 for releasing the non-ignition occurrence by the non-ignition storage means 102, and the like are provided in a control program format.
The combustion control means 100 starts combustion of the burner 2 as the water flow to the heat exchanger 3 is started in a state where the hot water supply section K is set to the operating state, to the heat exchanger 3. Is controlled so as to stop the combustion of the burner 2 as the water flow is stopped, and when the water flow to the heat exchanger 3 is detected, the burner 2 is set so that the tapping temperature becomes the target hot water supply temperature. The combustion amount is adjusted, and the normal combustion control for controlling the rotational speed of the fan 6 is performed so that the combustion air of an appropriate amount with respect to the combustion amount is ventilated.
[0014]
More specifically, after the operation state is set in accordance with the ON operation of the operation switch 15, the water flow amount detected by the water flow rate sensor 9 with the opening operation of the hot water tap 8a exceeds the set water amount and ignites. When the command is issued, the fan 6 is operated at a preset pre-purge speed for a normal set time to perform the pre-purge. The rotation speed control of the fan 6 in this pre-purge is performed by adjusting the drive power supply amount to the fan drive motor (not shown) so that the rotation speed detected by the rotation speed detection means 6a becomes the rotation speed for pre-purge. After that, the on-off valve 13 is opened to adjust the opening of the gas proportional valve 14 so that the amount of the ignition gas becomes the ignition gas amount, and the normal ignition process for performing the ignition operation to the burner 2 by the igniter 4 is executed.
Then, it is detected whether or not the frame rod 5 has been ignited. When the ignition is not detected, the fan 6 is set to a non-ignition set time longer than the normal set time (for example, 5 seconds), for example, the same as the pre-purge rotation speed. Rotating at the rotational speed, the ventilation state determining means 101 determines the ventilation state of the combustion air, and in the case of the proper ventilation state, the non-ignition ignition process for performing the reignition operation to the burner 2 is executed. ]
Thereafter, the hot water supply temperature is set to the target hot water supply temperature on the basis of the detection information of the incoming water temperature thermistor 10, the outgoing hot water temperature thermistor 11, the water flow rate sensor 9, and information on the target hot water supply temperature set by the temperature setting switch 16. The amount of fuel supplied to the burner 2 necessary for this is obtained by calculation. Then, the gas proportional valve 14 is adjusted and controlled so as to obtain a gas amount corresponding to the obtained fuel supply amount, and the fan 6 is configured so that the amount of combustion air by the fan 6 is in an appropriate combustion state with respect to the fuel supply amount. 6 is controlled.
The rotational speed control of the fan 6 is performed by driving power to the fan driving motor so that the rotational speed detected by the rotational speed detection means 6a becomes a rotational speed corresponding to the fuel supply amount (burner combustion amount) stored in advance. The supply amount is adjusted, and hot water at the target hot water supply temperature is supplied from the hot water outlet 8 in this way.
[0016]
The ventilation state discriminating means 101 rotates the fan 6 at the non-ignition set time so as to have the same rotational speed as the pre-purge rotational speed to a steady rotational state, and drives the fan driving motor in this steady rotational state. The power supply amount is detected, and the ventilation state in the ventilation path of the combustion air is determined based on the detected value.
More specifically, the drive power supply amount necessary for controlling the fan 6 to the pre-purge rotation speed in the proper ventilation state of the combustion air is stored in advance as the reference power supply amount. Then, the drive power supply amount to the fan drive motor is adjusted, and the drive power supply to the fan drive motor is performed in the setting drive state where the actual rotation speed of the fan 6 is set to the pre-purge rotation speed by the rotation speed detection means 6a. If the detected supply amount is smaller than the reference power supply amount, it is determined that the ventilation state of the ventilation path is deteriorated due to obstruction due to the back wind or the like and is not appropriate.
[0017]
The non-ignition storage means 102 stores the non-ignition when the above-described normal ignition process is performed on the burner 2 and the non-ignition occurs on the burner 2 during the normal ignition process, and the operation switch is turned off. Even if the hot water tap 8a is closed and the ignition command is released, the memory of the non-ignition is retained.
More specifically, when the ignition of the burner 2 is not detected by the frame rod 5 even though the normal ignition process by the gas proportional valve 14 or the igniter 4 is executed, the ventilation state determination unit 101 is in the ventilation state. If it is determined that the ignition is not appropriate, the occurrence of this non-ignition is memorized, and the reignition operation to the burner 2 by the gas proportional valve 14 or the igniter 4 is not executed.
When the ignition command is issued from the next time, if the occurrence of non-ignition is stored based on the storage information of the occurrence of non-ignition, the ignition process for non-ignition is executed. The process is executed.
[0018]
In this way, the ventilation state is determined when the burner 2 is not ignited, and if the ventilation state deteriorates and is not appropriate, the reignition operation is performed assuming that the raw gas in the combustion chamber 1 is not sufficiently discharged. This suppresses the generation of loud ignition noise caused by residual raw gas. After that, even if the ignition command is canceled, the occurrence of misignition is stored, and the ignition process for non-ignition is executed based on this stored information when the next ignition command is issued. Can be prevented.
[0019]
The memory canceling means 103 is configured to cancel the memory of the occurrence of non-ignition and always perform a normal ignition process to the burner 2 when there is an ignition command, and to shorten the time from the ignition command to the ignition as much as possible. Has been.
In other words, even if the ventilation state deteriorates and is not appropriate, the raw gas that has flowed out over time may be discharged spontaneously, and therefore, if the set time elapses after non-ignition has occurred, the non-ignition occurrence is stored. When the ignition command is issued, the normal ignition process for the burner 2 is always executed. The time from ignition command to ignition is made as short as possible.
[0020]
Next, the control operation of the control unit H will be described based on the control flowcharts shown in FIGS.
When a power switch (not shown) is turned on, the suppression flag storing the non-ignition occurrence of the burner 2 is turned off (step 1). And if the reset operation mentioned later is made, the hot water supply part K will be in an operation state by ON operation of the operation switch 15 (steps 2 and 3).
After that, when the hot water tap 8a is opened, if the detected value of the water flow sensor 9 exceeds the set water volume and water flow (water flow) to the heat exchanger 3 is detected and there is an ignition command, the suppression flag Is OFF (steps 4 and 5), the fan 6 is operated at a pre-purge speed for a normal setting time to perform the pre-purge, the ignition operation of the igniter 4 and the like is executed (steps 6 and 7), and the normal ignition is performed. Process.
[0021]
If the suppression flag is ON (step 5), the amount of drive power supplied to the fan drive motor is adjusted so that the actual rotational speed of the fan 6 by the rotational speed detection means 6a becomes the rotational speed for pre-purging. The fan 6 is operated for a set time for non-ignition, the drive power supply amount during the operation is detected, and whether or not the detected supply amount is smaller than the reference power supply amount is compared. If it is inappropriate, it is determined that it is appropriate (steps 8 to 10).
When it is determined that the ventilation state is appropriate (step 10), the fan 6 is operated for a normal setting time to perform the pre-purge, the ignition operation of the igniter 4 and the like is executed (steps 6 and 7), and the non-ignition is not performed. Ignition processing is performed. If the ventilation state deteriorates due to the obstruction of the ventilation path, etc., and it is determined that it is not appropriate, an error is displayed on the display unit 17 such that the ventilation state is not appropriate due to obstruction, etc., and the notification lamp 18 and the notification buzzer 19 are activated. The suppression flag is turned on to clear the timer (steps 10 to 13).
[0022]
When the ignition operation to the burner 2 is executed by the igniter 4 or the like and the ignition of the burner 2 is detected by the frame rod 5 (step 14), the suppression flag is turned off to clear, and the hot water temperature thermistor 11 detects the ignition. The amount of fuel supplied to the burner 2 and the air flow rate of the fan 6 are controlled so that the temperature of the discharged hot water reaches the target hot water supply temperature set by the temperature setting switch 16 (steps 15 and 16).
Such normal combustion control is executed until the hot water tap 8a is closed and no water flow is detected or the operation switch 15 is turned off (steps 17 and 18). That is, when the hot water tap 8a is closed and the detected value of the water flow rate sensor 9 falls below the set water amount, combustion of the burner 2 is stopped, and the operation switch 15 is turned OFF even when the hot water tap 8a is not closed. Then, the combustion of the burner 2 is stopped (step 19).
[0023]
If the ignition of the burner 2 is not detected (step 14), the fan 6 is operated for a non-ignition set time and the raw gas in the combustion chamber 1 is discharged (step 20). The amount of driving power supplied to the fan 6 at this time is detected, and the ventilation state in the ventilation path of the combustion air is determined (step 21). When it is determined that the ventilation state is appropriate (step 22), it is assumed that the raw gas is sufficiently discharged, and the fan 6 is operated for a normal set time to perform the pre-purge, and the igniter 4 or the like supplies the burner 2 to the burner 2. A reignition operation is executed (steps 23 and 24), and a non-ignition ignition process is performed. If it is determined that the ventilation state is not appropriate due to the blockage of the ventilation path (step 22), an error is displayed on the display unit 17 such that the ventilation state is not appropriate due to blockage or the like, and the notification lamp 18 and the notification buzzer are displayed. 19 is operated to turn on the suppression flag and clear the timer (steps 11 to 13).
[0024]
When the reignition operation for the burner 2 is executed and the ignition of the burner 2 is detected by the frame rod 5 (step 25), the suppression flag is turned OFF and cleared (step 15). If the ignition of the burner 2 is not detected even when the reignition operation is performed on the burner 2, an error such as an ignition failure is displayed on the display unit 17 (steps 25 and 26).
[0025]
As described above, when it is determined that the ventilation state is not appropriate due to the blockage in the ventilation path of the combustion air (step 22), an error is displayed on the display unit 17 (steps 11 to 13). When the operation 15 is turned off or a reset operation such as closing the hot-water tap 8a and turning off the water flow rate sensor 9 is performed, the error display on the display unit 17 is released and the state is reset. If such a reset operation is not performed and an error is displayed on the display unit 17 (step 2), if the suppression flag is ON, the timer is counted (steps 27 and 28). When the timer is counted up and the set time elapses, the timer is cleared and the suppression flag is turned OFF (steps 29 and 30).
[0026]
[Another embodiment]
[0027]
( 1 ) In the above embodiment, in the set driving state in which the actual rotational speed of the fan 6 is maintained to be a preset pre-purge rotational speed, the amount of driving power supplied to the fan 6 at that time is detected. The detected supply amount is compared with the reference power supply amount to determine whether or not the ventilation state is appropriate, but conversely, the ventilation state is determined based on the actual rotational speed of the fan 6. You can also.
In other words, in the proper ventilation state, the rotation speed of the fan 6 corresponding to the air amount necessary for the pre-purge is stored in advance as the reference rotation speed, and the drive power supply amount required to rotate at the reference rotation speed is also stored. deep. Then, in the set drive state in which the fan 6 is rotated with the stored drive power supply amount, the rotational speed detection means 6a detects the actual rotational speed of the fan 6, and compares the detected rotational speed with the reference rotational speed. The ventilation state of the ventilation path is determined.
[0028]
( 2 ) In the above embodiment, if the ventilation state is appropriate when the burner 2 is not ignited, a re-ignition operation is executed. If the re-ignition operation is not performed, an error is displayed and an ignition operation is performed. Although it is configured so as not to be executed, it may be configured to execute the reignition operation again if the ventilation state is determined again and it is appropriate if the ignition is not ignited even if the reignition operation is executed. That is, the number of executions of the re-ignition operation is not limited to one, and may be appropriately changed to two or more.
[0029]
( 3 ) In the above embodiment, the combustion apparatus according to the present invention is applied to the hot water supply apparatus, but may be applied to other apparatuses.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hot water supply apparatus. FIG. 2 is a control flowchart of a hot water supply apparatus. FIG. 3 is a control flowchart of a hot water supply apparatus.
2 Burner 6 Fan 102 as ventilation means Non-ignition storage means 103 Memory release means H Control means

Claims (1)

When there is a burner, ventilation means for venting combustion air to the burner, and an ignition command, a normal ignition process for performing an ignition operation on the burner after operating the ventilation means for a normal set time, and At the time of non-ignition of the burner by the normal ignition process, the ventilation means is operated for a non-ignition setting time longer than the normal setting time, and combustion is performed based on the work amount in the set driving state of the ventilation means during the operation. A combustion apparatus provided with a control means for performing a non-ignition ignition process for determining a ventilation state of air and performing a re-ignition operation to the burner in the case of a proper ventilation state,
When the non-ignition occurs, even if the ignition command is released, the occurrence of non-ignition is stored, and when ignition is properly performed, non-ignition storage means is provided for releasing the non-ignition occurrence and the control If there is an ignition command, the means stores the non-ignition occurrence based on the storage information of the non-ignition storage means, executes the non-ignition ignition process, and does not store the non-ignition occurrence , Configured to perform the normal ignition process ,
A combustion apparatus provided with a memory canceling means for canceling the memory of the non-ignition occurrence by the non-ignition storage means when a set time elapses after the non-ignition occurs .

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