JP2002130662A - Natural air supply and exhaust system of burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ignite a burner without letting a user feel nonconformity impression or badness of operability, and besides without causing explosive bonding even if it ignites after occurrence of ignition failure or flame failure. SOLUTION: In case that the igniting action fails due to ignition failure or flame failure at the last igniting action, if the user operates the ignition switch 12 of a remote controller 11, the ignition switch 12 accepts it, but an igniter 13 does not act to ignite immediately, but it performs igniting action behind a specified time after operation of the igniting switch 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a natural supply / exhaust type combustion apparatus having no fan for forced supply / exhaust.

[0002]

2. Description of the Related Art A natural gas supply / exhaust gas appliance does not have a forced supply / exhaust fan, and is configured to supply / exhaust by convection of heated air during gas combustion. Further, in such a gas appliance, as shown in FIG. 1 (a), when an ignition switch is turned on by operating an ignition switch, gas is opened from a gas burner as shown in FIG. 1 (c). The gas is discharged and the ignition device is discharged and ignited with a slightly longer time as shown in FIG. 1 (b). When the gas burner is ignited as shown in FIG. 1 (d), the gas burner continues burning.

[0003]

In such a natural gas supply / exhaust type gas appliance, the internal air cannot be forcibly exhausted as in a forced supply / exhaust type gas appliance. When repeated, gas (unburned gas) stays inside. Immediately after that, when the ignition switch is turned on to perform the ignition operation, the concentration of the gas becomes high due to the accumulated gas, and when ignited in such a state, explosion (ignition with explosion sound or small explosion) occurs. There was a possibility.

[0004] In order to prevent such explosion, there is a method in which, when misfiring or extinguishment occurs, the ignition switch is not turned on even if the ignition switch is pressed for a certain period of time thereafter. However, if the ignition switch is not turned on for a certain period of time after misfiring or extinguishing in this way, even if the user operates the ignition switch and tries to re-ignite, the ignition switch will not be accepted and the user will have trouble. There is an inconvenience in that the user feels bad feeling and operability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method for preventing a user from feeling inconvenience or poor operability without causing ignition or extinguishing. It is an object of the present invention to provide a natural supply / exhaust type combustion apparatus which does not cause explosion even if the ignition operation is performed after the occurrence of the combustion.

[0006]

According to a first aspect of the present invention, there is provided a natural supply / exhaust type combustion apparatus, comprising: a combustion device; an ignition device for igniting the combustion device; and an operation unit for igniting the ignition device. In a natural air supply / exhaust type combustion apparatus which supplies and exhausts air by natural convection at the time of combustion of the combustion appliance, if ignition of the combustion appliance has failed during the previous ignition operation, ignition by the operation unit is performed. It is characterized in that the ignition device is ignited with a delay from the normal operation.

[0007]

In the natural air supply / exhaust type combustion apparatus according to the first aspect, if ignition of the combustion appliance fails during the previous ignition operation, the ignition operation by the operation unit is delayed from normal operation. Since the ignition device is caused to perform the ignition operation, the ignition operation of the operation unit is accepted even if the previous ignition has failed and the operator tries to operate the operation unit immediately thereafter. Ignites with a delay. Therefore, by the time of the ignition operation, the concentration of the accumulated gas becomes low due to the blowing or diffusion of the wind, so that the explosion can be prevented. In addition, even if the operation unit is operated immediately after the ignition failure, the operation unit is accepted, so that the user is less likely to feel a problem or poor operability.

[0008]

FIG. 2 shows a bath kettle (natural gas supply / exhaust gas appliance) 1 according to an embodiment of the present invention installed outdoors. This bath kettle is provided with a heat exchanger 3 at an upper part in a can body 2 and a gas burner (combustion appliance) 4 below the heat exchanger 3.
And an ignition device 13 is provided near the gas burner 4. Also, the can body 2 is open at the lower surface,
The upper part is provided with an exhaust part 5. Thus, when the gas burner 4 is ignited by the spark discharge from the ignition device 13 and the gas burner 4 is burned, the water flowing in the heat exchanger 3 and the combustion gas exchange heat and flow into the heat exchanger 3. The water is heated. At the same time, when the combustion gas and the heated air rise inside the can 2 and are discharged to the outside from the exhaust unit 5, fresh air for burning the gas is convected from the bottom of the can 2 by the convection. 2.

The bath kettle 1 is installed near a bathtub 6 with an outer wall 7 interposed therebetween. The heat exchanger 3 is connected to a circulation fitting 8 of the bathtub 6 by a bathtub water feed pipe 9 and a bathtub water return pipe 10. ing. A remote controller 11 is mounted above the bathtub 6 on the interior surface of the outer wall 7. When an ignition switch (operating section) 12 provided in the remote controller 11 is turned on, the gas burner 4 is ignited by the ignition device 13 and burns, and the water stored in the bathtub 6 is removed by the heat exchanger. 3, the water in the bathtub 6 is heated by convection.

FIG. 3 is a flowchart for explaining the processing when the ignition switch 12 is operated in the bath kettle 1 and FIG.
Is a time chart for explaining the processing. With reference to these figures, the operation when the ignition switch 12 is operated will be described. When the ignition switch 12 of the remote controller 11 is operated to turn on the ignition switch 12 (step S1), the control circuit in the remote controller 11 determines that no ignition has occurred during the previous operation of the ignition switch or that the fire has extinguished (fire extinguishing in the middle). The history is checked to see if the ignition has failed due to the failure (step S2). If it is determined that no misfire or extinguishment has occurred during the previous operation of the ignition switch, the ignition operation starts immediately (step S4).
The gas is released from the gas burner 4, and the ignition device 13 is ignited by spark discharge. When the gas burner 4 is ignited by this ignition operation, the history of successful ignition is written into the memory, and the ignition operation ends. If the ignition is not possible due to misfiring or extinguishing, the history of ignition failure is written into the memory, and the operation waits until the ignition switch 12 is operated again.

On the other hand, as a result of examining the history in step S2, if misfiring or extinguishing has occurred during the previous ignition operation, a predetermined time (eg, about 10 seconds) has elapsed since the operation of the ignition switch 12. Delay (step S
3), the ignition device 13 is operated to perform an ignition operation (step S4). For example, if the ignition operation is successful before the first ignition operation shown in FIG. 4 is performed, the first ignition operation is performed simultaneously with the operation of the ignition switch 12. Assuming that the first ignition operation has failed, the second ignition operation is performed with a delay of t1 from the operation of the ignition switch 12. If the second ignition operation also fails, the third ignition operation is performed with a delay of t2 from the operation of the ignition switch 12. This third delay time t
2 is longer than the second delay time t1, and as a result, the time interval δt between the ignition operation and the ignition operation is set to be longer than a predetermined time.
Is prevented from exploding. Further, since the operation of the ignition switch 12 is accepted, the user does not feel uncomfortable.

[0012] Even when the gas burner 4 is ignited by these ignition operations, the history of successful ignition is written into the memory and the ignition operation is terminated. If the ignition fails due to misfiring or extinguishment, the history of ignition failure is written into the memory, and the operation waits until the ignition switch 12 is operated again.

Even if the previous ignition operation failed due to misfiring or extinguishing, if the time ΔT from the previous ignition operation to the current operation of the ignition switch has sufficiently passed,
There is no fear of explosion. Therefore, step S in the flow chart
2 may be replaced with a determination that "the predetermined time has not elapsed since the previous ignition operation, and has there been no ignition or extinguishing in the previous ignition operation?"

In the above embodiment, when the previous ignition operation failed, the timing from the operation of the ignition switch to the ignition operation of the ignition device was directly delayed.
Monitors the time from the previous ignition operation to the operation of the ignition switch, and if the time from the previous ignition operation to the operation of the ignition switch is shorter than a predetermined time, the time interval from the previous ignition operation to the current ignition operation The timing from the operation of the ignition switch to the ignition operation of the ignition device may be delayed so that δt is equal to or longer than a predetermined time.

[0015]

According to the natural supply / exhaust type combustion apparatus of the first aspect, even if the previous ignition has failed and the operator attempts to ignite immediately by operating the operation unit, the ignition operation of the operation unit is not performed. However, since the ignition device performs the ignition operation with a delay, the concentration of the accumulated gas becomes low by the blowing or diffusion of the wind at the time of the ignition operation, so that the explosion can be prevented. Moreover, even if the operation unit is operated immediately after the ignition failure, the operation unit is accepted,
There is little risk of causing the user to feel a malfunction or poor operability.

[Brief description of the drawings]

FIG. 1 is a time chart for explaining an ignition operation in a conventional natural supply / exhaust gas appliance, wherein (a) shows an operation timing of an ignition switch, and (b) shows an ignition operation timing of an ignition device. , (C) shows the gas release timing, and (d) shows the combustion state of the gas burner.

FIG. 2 is a schematic sectional view showing a state in which a natural gas supply / exhaust gas appliance according to an embodiment of the present invention is installed outdoors.

FIG. 3 is a flowchart illustrating an ignition operation in the natural gas supply / exhaust gas appliance according to the first embodiment.

FIGS. 4A and 4B are time charts for explaining the ignition operation shown in the flowchart of the above, where FIG. 4A shows the operation timing of the ignition switch, FIG. 4B shows the ignition operation timing of the ignition device, and FIG. Indicates the gas release timing,
(D) shows the combustion state of the gas burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bath kettle 2 Can body 3 Heat exchanger 4 Gas burner 11 Remote controller 12 Ignition switch 13 Ignition device

Claims (1)

[Claims] 1. A combustion appliance, comprising: an ignition device for igniting the combustion appliance; and an operation unit for causing the ignition device to perform an ignition operation, and supplies and exhausts by natural convection at the time of combustion of the combustion appliance. In the case of the natural supply / exhaust type combustion device, when the ignition of the combustion appliance has failed during the previous ignition operation, the ignition device is caused to perform the ignition operation with a delay from the normal ignition operation by the operation unit. A natural supply / exhaust type combustion device characterized by the above-mentioned.