JP3539092B2 - 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 apparatus, and more particularly, to a combustion apparatus having an incomplete combustion prevention device that closes an on-off valve based on a thermoelectromotive force level of a thermocouple.

[0002]

2. Description of the Related Art Generally, a combustion device includes a safety device that closes a gas flow path in the case of incomplete combustion or extinguishment. As this safety device, a magnet type safety valve using thermoelectromotive force is used. For example, a combustion device provided with a magnetic safety valve will be described with reference to FIG.
The burner 4 is provided with a primary thermocouple 1 that is heated by the combustion flame F to generate a thermoelectromotive force. Further, in the combustion chamber 22 below the heat exchanger 23, a secondary thermocouple 2 which is heated by exhaust heat from an exhaust clogging detection opening 26 provided in a wall of the combustion chamber 22 to generate a thermoelectromotive force is provided. When the interior of the primary thermocouple 1 becomes an oxygen-deficient atmosphere due to the combustion exhaust gas, the combustion flame F heating the primary thermocouple 1 starts to lift (spray), thereby reducing the thermoelectromotive force. On the other hand, the secondary thermocouple 2
Are connected in series in reverse polarity so as to generate back electromotive force with respect to the primary thermocouple 1, and increase the thermoelectromotive force as the fins of the heat exchanger 23 are closed, so that the primary thermocouple 1 and the secondary thermocouple 1 2 and the combined electromotive force is reduced.

[0003] The magnet type safety valve 10 is provided with a valve body (not shown) urged in a closing direction, and can open and close a gas passage by being able to contact and separate from a seat portion (not shown) of a main body. Further, the magnet type safety valve 10 is provided with an electromagnet (not shown) which keeps the valve opened by electromagnetic force when opened by pushing force, and keeps the valve open even when the hand is released. The electromagnet is provided with a thermocouple-side holding coil 8 connected to the thermocouple and a battery-side holding coil 9 connected to the controller 5, and generates an electromagnetic force by being energized to each coil. The primary thermocouple 1 and the secondary thermocouple 2 are connected in series with opposite polarities and connected to the thermocouple-side holding coil 8 of the magnet type safety valve 10.

[0004] The combined electromotive force of the thermocouple requires time to reach a predetermined level, and the magnet-type safety valve 10 cannot be kept open only with the combined electromotive force immediately after ignition. Therefore, when the operation unit (not shown) is pushed at the initial stage of ignition, power is supplied from the battery power to the battery-side holding coil 9 and an electromagnetic force is instantaneously generated to generate a magnetic safety valve 10.
Is kept open. After a lapse of a predetermined time, the power supply to the battery-side holding coil 9 is stopped. At this time, the combined electromotive force of the thermocouple rises to a predetermined level or more and the power is supplied to the thermocouple-side holding coil 8. Keep the valve open.

If the combined electromotive force of the thermocouple decreases during combustion, the electromagnetic force of the magnet type safety valve 10 decreases, and the gas passage is closed. That is, when a situation such as an oxygen-deficient state, a closed state of the heat exchanger 23, misfiring, or the disappearance of the combustion flame F occurs, the combined electromotive force of the thermocouple decreases, and the magnet-type safety valve 10 generates the combined thermocouple. The valve cannot be kept open by the electromotive force, and the gas flow path is closed to prevent incomplete combustion.

Further, such a combustion device is provided with a dry battery or a storage battery as a battery power source, and a controller 5 is provided.
Supply power to The burner 4 is provided with an igniter 7 for igniting the fuel gas, and the igniter 7 is continuously discharged by the controller 5 using battery power. Further, as described above, when the pressing force to the operation unit is released, the magnet type safety valve is instantaneously attracted by the battery power and maintains the valve open state. Therefore, the battery power is used mainly at the start of combustion to continuously discharge the fuel gas and to keep the gas passage open for a predetermined time until the combined electromotive force of the thermocouple rises.

[0007]

However, these devices that use battery power have a problem in that if the frequency of use is high, the battery must be replaced frequently. In order to efficiently use battery power, for example, it is conceivable to stop unnecessary continuous discharge immediately after ignition of fuel gas. In this case, if a frame guard that detects the presence or absence of a flame using the rectifying action of the flame is used, the presence or absence of ignition can be instantaneously determined. However, the frame guard itself is expensive and the frame guard itself is expensive. The power consumption of the device itself increases, and the purpose cannot be achieved. On the other hand, in an incomplete combustion prevention device using a thermocouple, the primary thermocouple and the secondary thermocouple are connected in series with opposite polarities, and it takes time for the thermoelectromotive force at the time of ignition to reach a predetermined level, The presence or absence of ignition cannot be quickly determined by the thermoelectromotive force. Moreover, the combined electromotive force of the primary thermocouple and the secondary thermocouple, even when there is no abnormality, becomes exhaust resistance because the heat exchanger is cooled at the time of ignition and the draft force of the exhaust gas is weak, and the secondary thermocouple The back electromotive force of the pair tends to increase, and the combined electromotive force tends to decrease at the time of ignition. An object of the present invention is to solve the above problems, reduce power consumption with a simple and inexpensive structure, and prolong battery life.

[0008]

[0009]

[0010]

In order to achieve the object of the present onset to solve the above problems
The combustion device according to claim 1 is characterized in that a heat exchanger heated by combustion heat from a burner, an on-off valve for opening and closing a gas flow path to the burner, and a fuel gas ejected from the burner are continuously discharged by battery power. A combustion chamber formed between the heat exchanger and the burner; a primary thermocouple that is heated by the combustion flame of the burner to output a thermoelectromotive force; and an exhaust clog provided in the combustion chamber. A secondary thermocouple that is heated by exhaust heat from the detection opening to output a thermoelectromotive force, the primary thermocouple and the secondary thermocouple are connected in series with opposite polarities, and heat synthesized by the series connection Valve opening and holding means for opening and holding the on-off valve when the electromotive force is equal to or higher than a predetermined level; and forcible valve opening and holding means for forcibly opening and holding the on-off valve with battery power at the beginning of ignition. In the combustion device, combustion is started and a predetermined Until the ambient temperature is reached, a shield that blocks the heat of combustion or exhaust heat of the burner to prevent the rise of the back electromotive force by the secondary thermocouple, or retracts the secondary thermocouple from a predetermined position to reduce the back electromotive force. The gist of the present invention is to provide a moving body that prevents ascent.

[0011]

[0012]

[0013] Combustion apparatus according to claim 1 of the present invention having the above structure, to the combustion is started reaches a predetermined ambient temperature, the secondary thermocouple shields shields the combustion heat or exhaust heat of the burner To prevent the back electromotive force from rising. Or
The moving body retracts the secondary thermocouple from a predetermined position to prevent the back electromotive force from rising. In other words, by shielding or retracting the secondary thermocouple from the combustion heat or exhaust heat of the burner ,
Reduce the thermoelectromotive force of the secondary thermocouple. Therefore , at the beginning of ignition
The rise of the combined electromotive force of the thermocouple is accelerated, and the combined
Can be increased. Further, a special electric circuit can be eliminated.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of a combustion apparatus of the present invention will be described below. FIG. 1 is a schematic diagram of a gas water heater as one embodiment. The water heater includes a burner 4 that burns a mixture of fuel gas and primary air, a heat exchanger 23 that heats flowing water by combustion heat, and a combustion chamber 22 that forms a combustion space for the burner 4.

The water supply path from the water inlet is provided with a faucet 24 for opening and closing the flow path by an operation unit (not shown). The gas supply path to the burner 4 is opened and closed simultaneously with the opening and closing of the faucet 24. Is provided with an instrument stopper 25 for opening and closing the device. Downstream of the instrument plug 25, the valve is opened by being pushed by the operation unit,
A magnetic safety valve 10 is provided which keeps the valve open by the thermoelectromotive force of a thermocouple, which will be described later, and which closes when the combustion electromotive force decreases when the combustion abnormality occurs. Further, the controller 5 has a built-in battery power source, and the burner 4 is provided with an electrode 7 for igniting the fuel gas by continuous discharge according to a command from the controller 5.

The thermocouple comprises a primary thermocouple 1 and a secondary thermocouple 2. The primary thermocouple 1 is provided in the burner 4, and is directly heated by the combustion flame F to generate a thermoelectromotive force. The secondary thermocouple 2 is heated by exhaust heat from an exhaust clogging detection opening 26 provided in the combustion chamber 22 below the heat exchanger 23 to generate a thermoelectromotive force. Also, a primary thermocouple 1 and a secondary thermocouple 2
Means that the magnetic safety valve 10
To the thermocouple side holding coil 8.

At one end of the valve shaft 30 of the magnet safety valve,
A valve (not shown) urged in the closing direction by a spring (not shown)
Is provided so that it can be brought into contact with and separated from the sheet portion of the main body.
At the other end of the valve shaft 30, an attraction piece 31 is provided to face the attraction surface of the electromagnet (FIG. 2). A U-shaped iron core 32 having an electromagnet attraction surface has a thermocouple-side holding coil 8 connected to a thermocouple and a battery-side holding coil 9 connected to a controller 5.
And an electromagnetic force is generated in the iron core 32 by energizing each coil. When the valve element is opened by the pushing force, the suction piece 31 and the iron core 32 are pressed against each other, the suction piece 31 is sucked by the electromagnetic force generated in the iron core 32, and the valve element is opened and held even when the hand is released. You.

In addition, the thermoelectromotive force of the thermocouple requires time to reach a predetermined level depending on the heat capacity of the thermocouple itself, and does not generate a sufficient adsorption force immediately after ignition. Therefore, when the operation unit is pushed, the battery power is supplied to the battery-side holding coil 9 by the battery power, the suction piece 31 is instantaneously adsorbed, and the thermoelectromotive force of the thermocouple at the start of combustion reaches a predetermined level. Until the valve is opened. Then, after a lapse of a predetermined time, the thermoelectromotive force of the thermocouple rises to a predetermined level or more, and the thermocouple-side holding coil 8 is energized, and the valve body is kept open and held as it is. Further, when the thermoelectromotive force of the thermocouple to the thermocouple side holding coil 8 decreases during combustion, the electromagnetic force of the iron core 32 decreases, so that the spring (not shown) force in the valve closing direction wins. Then, the suction piece 31 is detached, and the valve body is closed.

When the interior of the primary thermocouple 1 becomes an oxygen-deficient atmosphere due to the combustion exhaust gas, the combustion flame F heating the primary thermocouple 1 starts to lift (spray), and the generated electromotive force is reduced. On the other hand, the secondary thermocouple 2 is connected in series with a reverse polarity so as to generate a back electromotive force with respect to the primary thermocouple 1, and increases the generated electromotive force according to the degree of fin blockage of the heat exchanger 23, thereby increasing the primary thermocouple. The combined electromotive force of the pair 1 and the secondary thermocouple 2 is reduced. Therefore, when a situation such as an oxygen deficiency state, a closed state of the heat exchanger 23, non-ignition, or disappearance of the combustion flame F occurs, the combined electromotive force of the thermocouple decreases, and the magnet-type safety valve 10 reduces the heat of the thermocouple. The valve cannot be kept open by the electromotive force, and the gas flow path is closed to prevent incomplete combustion.

After the ignition operation, the controller 5 supplies the battery power to the battery-side holding coil 9 of the magnet safety valve 10 until a predetermined time when the thermoelectromotive force of the thermocouple rises, and forcibly opens the valve to hold the valve open. A valve holding part 5a is provided.
Further, an igniter unit 5b for controlling continuous discharge to the burner 4 is provided, and the thermoelectromotive force of the thermocouple supplied to the magnet type safety valve 10 is synthesized from the thermoelectromotive force of the primary thermocouple 1 (the combined electromotive force (primary thermocouple 1 and 2). An energizing circuit switching unit 5d for switching to a combined electromotive force with the secondary thermocouple 2) is provided.
Further, it is determined whether or not the thermoelectromotive force of the thermocouple is equal to or higher than a predetermined level. When the thermoelectromotive force reaches the predetermined level or higher, the continuous discharge by the igniter unit 5b and the forced valve holding by the forced valve holding unit 5a are immediately stopped. An electromotive force determination unit 5c is provided. Further, a timer unit 5e that determines the control timing of each control unit
Is provided. Hereinafter, the energizing circuit switching unit 5d will be described.
However, this energizing circuit switching unit 5d represents an embodiment of the present invention.
It is not shown, but shown as Reference Example 1.

The thermocouple circuit includes a pattern (power supply pattern 1) for supplying a combined electromotive force of the primary thermocouple 1 and the secondary thermocouple 2 to the thermocouple-side holding coil 8, and only the electromotive force of the primary thermocouple 1 And a second FET 6 that is a switching element for switching a pattern (a current supply pattern 2) for supplying the current to the thermocouple-side holding coil 8. Each FET has a controller 5
The switching of the thermocouple circuit is controlled by a command from the energizing circuit switching unit 5.

The control by the energizing circuit switching unit 5d of the controller 5 is switched to the energizing pattern 2 so that only the thermoelectromotive force of the primary thermocouple 1 is supplied to the magnet type safety valve 10 for a predetermined time from the ignition operation (the first pattern). 1 FET3 to 0
N, the second FET 6 is turned off). Then, after a lapse of a predetermined time, in order to switch from the thermoelectromotive force of the primary thermocouple 1 to the combined electromotive force, switching to the energization pattern 1 is performed (first FE).
T3 is turned OFF, and the second FET 6 is turned ON).

Next, the controller 5 during the ignition operation
Will be described with reference to FIG. When the operation unit is operated during ignition, the magnet safety valve 10
To the igniter unit 5b (step 1).
Starts a continuous discharge to the electrode 7. At the same time, the forcible valve opening holding section 5a energizes the battery side holding coil 9 of the magnet safety valve 10 to forcibly maintain the valve opening of the magnet safety valve 10 (step 2). Further, the energizing circuit switching unit 5d switches to the energizing pattern 2 and sets the thermoelectromotive force of the primary thermocouple 1 (FIG. 6).
Is supplied to the thermocouple side holding coil 8 of the magnet type safety valve 10 (step 3). The electromotive force determination unit 5c determines that the thermoelectromotive force of the primary thermocouple 1 (the voltage Vmg across the thermocouple-side holding coil 8) exceeds the electromotive force level V1 within T seconds after the ignition operation (step 11) (step 11). 4) Immediately, a continuous discharge by the igniter unit 5b;
The energization of the magnet safety valve 10 by the forcibly open valve holding section 5a is stopped (step 5). This electromotive force level V1
Is set as a voltage that can hold the opening of the magnet safety valve 10. Therefore, even when the energization by the forced valve-opening holding unit 5a is stopped, as long as the thermoelectromotive force of the primary thermocouple 1 exceeds the electromotive force level V1, the magnet safety valve 10 holds the valve open.

Subsequently, when the electromotive force determining unit 5c detects that the thermoelectromotive force of the primary thermocouple 1 has exceeded the electromotive force level V2 (step 6), the energizing circuit switching unit 5d switches to the energizing pattern 1, The thermoelectromotive force supplied to the thermocouple side holding coil 8 of the safety valve 10 is switched from the thermoelectromotive force of the primary thermocouple 1 (characteristic a in FIG. 6) to the combined electromotive force (characteristic b in FIG. 6) (step 7). The electromotive force level V2 is a voltage at which the magnet safety valve 10 can be held open even if the electromotive force is changed to a synthetic electromotive force, unless an oxygen-deficient atmosphere or a fin closed state occurs. Therefore, in the normal case, the combustion is continued as it is because the combined electromotive force of V1 or more is generated (step 8). When the fire extinguishing operation is performed (step 9), the appliance plug 25 and the water faucet 24 are closed, and the combustion is stopped (step 10). If the thermoelectromotive force of the primary thermocouple 1 does not exceed the electromotive force level V1 within T seconds after the ignition operation, the combustion is determined to be abnormal due to an oxygen-deficient atmosphere or the like and the combustion is stopped (step 11). If an abnormal state occurs due to an oxygen-deficient atmosphere or fin clogging during the continuation of the combustion in step 8, the back electromotive force of the primary thermocouple 1 decreases, or the back electromotive force of the secondary thermocouple 2 increases to increase the combined electromotive force. Drops below the electromotive force level V1, the magnet safety valve 10
In this case, the valve cannot be kept open, closes the gas flow path, and stops combustion.

Accordingly, in the prior art, as shown in the electromotive force characteristic shown in FIG. 7, the continuous electromotive force b is continuously discharged for T2 seconds when the electromotive force level is equal to or higher than the electromotive force level V1, whereas in the present embodiment, the primary electromotive force is Continuous discharge can be stopped in T1 seconds when a reaches the electromotive force level V1. In addition, the forced valve opening holding section 5a
To the magnet safety valve 10 can be shortened from T2 seconds to T1 seconds, and since the value of the primary electromotive force a is larger than the combined electromotive force b, the power supplied by the forced valve holding unit 5a is reduced accordingly. Can be smaller.

Next, the processing of the controller 5 as a second reference example will be described with reference to FIG. Second participant
The example is configured as shown in FIG. 3 without including the electromotive force determination unit 5c in the first reference example . When the operation unit is operated at the time of ignition, continuous discharge to the electrode 7 is started and the magnetic safety valve 10 is forcibly opened and held, as in the first reference example . Then, it waits until T1 seconds elapse from the ignition operation, and stops the continuous discharge and the forced opening of the magnet type safety valve. This T1 second is a time during which the thermoelectromotive force of the primary thermocouple 1 can reach a magnitude that can hold the magnet safety valve 10 open unless an abnormality such as an oxygen-deficient atmosphere occurs. When T2 seconds elapse after ignition (T
2> T1), the energization circuit switching unit 5d switches from the energization pattern 2 to the energization pattern 1, and the magnet type safety valve 10
Is switched from the electromotive force of the primary thermocouple 1 (characteristic a in FIG. 6) to the combined electromotive force (characteristic b in FIG. 6) (step 7). This T2 second is a time during which the magnet safety valve 10 can be kept open even if the electromotive force is changed to a synthetic electromotive force, unless an oxygen-deficient atmosphere or fin blockage occurs. Then, if the abnormal state due to the oxygen-deficient atmosphere or the fin blockage occurs during the continuation of the combustion in step 8, the combined electromotive force drops to the electromotive force level V1 or less, and the magnet safety valve 10 cannot be kept open and the gas flow path And shut off combustion.

Next, an embodiment of the present invention will be described with reference to FIG. In the first and second reference example, the ignition initial, in order to avoid the influence of the secondary thermocouple 2, the magnet type safety valve 10 is switched to energization pattern 2 from the energization pattern 1 and the open-valve state hold, in this example In addition, the generation of the thermoelectromotive force of the secondary thermocouple 2 is to be reduced only at the initial stage of ignition, while the energization circuit is not switched and the energization pattern 1 remains connected.

For example, in (a), a mounting plate 27 for fixing the secondary thermocouple 2 to the combustion chamber 22 is provided in a Z-shape, and is made of a material such as a bimetal or the like which is deformed by temperature. At the initial stage of ignition, the shape of the mounting plate 27 is at a position where the secondary thermocouple 2 is retracted from the opening 26 of the combustion chamber, so that the thermoelectromotive force generated by the secondary thermocouple 2 is reduced. Further, when the heat conduction from the combustion chamber and the ambient temperature rise due to the combustion flame F and the temperature of the mounting plate 27 rises, Z
The angle of the part folded in the shape of a letter is deformed. When the mounting plate 27 is deformed, the fixed secondary thermocouple 2 comes into the combustion chamber from the opening 26, and the secondary thermocouple 2 generates a normal thermoelectromotive force.

(B) An L-shape is formed inside the wall of the combustion chamber 22 below the exhaust clogging detection opening 26 at the initial stage of ignition when the exhaust gas is not at a high temperature, and a shielding plate 28 for blocking combustion heat is formed by a bimetal. It is made of a material such as a metal that is deformed by a temperature such as. Then, at the initial stage of ignition, the shielding plate 28 blocks the combustion heat, so that the thermoelectromotive force of the secondary thermocouple 2 decreases.
When the heat conduction from the combustion chamber and the ambient temperature rise due to the combustion flame F, the shielding plate 28 is deformed so as to be folded from an L-shape to a U-shape, thereby shielding the secondary thermocouple 2 from the combustion flame F. Is released, and the secondary thermocouple 2 generates a normal thermoelectromotive force.

(C) shows the secondary thermocouple 2 from inside the combustion chamber.
A cover plate 29 formed in a box shape so as to block the exhaust clogging detection opening 26 of the combustion chamber from the inside is made of a material such as a bimetal or the like that deforms depending on the temperature. Further, a small hole is formed in the front surface of the cover plate 29 facing the secondary thermocouple 2. Therefore, at the initial stage of ignition, the secondary thermocouple is covered from the inside of the opening of the combustion chamber to shield combustion heat, and the external thermocouple 2 is cooled by the outside air being drawn into the combustion chamber from the small hole by the draft force. And the thermoelectromotive force is reduced.
When the ambient temperature reaches a predetermined temperature due to the combustion flame F,
The cover plate 29 jumps over the opening 26 and moves. That is, the thermoelectromotive force of the secondary thermocouple 2 becomes low in the initial stage of ignition, and generates a normal thermoelectromotive force after reaching a predetermined ambient temperature.

Accordingly, in the above (a), (b) and (c), the secondary thermocouple 2 is provided so as to be shielded or kept away from the combustion flame F at the initial stage of ignition.
By suppressing the generation of the thermoelectromotive force, the same effect as in Reference Example 1 or 2 can be obtained. And the combustion flame F
When the ambient temperature reaches a predetermined temperature, the secondary thermocouple 2 is deformed into a predetermined shape and the shield from the combustion flame F is released, or the secondary thermocouple 2 approaches the combustion flame F and starts normal detection. As a result, in this embodiment , as in Reference Example 1 or 2, the rise of the combined electromotive force of the thermocouple can be accelerated at the initial stage of ignition, and the combined electromotive force value can be increased. Besides, reference
The energizing circuit switching unit 5d required in Example 1 or 2 can be omitted .

[0032]

[0033]

Further, since a special electric circuit is not required, it can be manufactured at a low cost.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the spirit of the present invention. It is. For example, as in the present embodiment, the thermocouple and the magnet-type safety valve are connected to a closed circuit, and the method is not limited to the system in which the magnet-type safety valve is directly opened and held by the thermoelectromotive force of the thermocouple. The combustion device may open and close the magnetic safety valve by battery power from the controller while detecting the output of the combustion chamber. In addition, the primary thermocouple is not limited to being heated by the combustion flame F of the burner to generate a thermoelectromotive force. Before the combustion of the burner becomes incomplete combustion, a primary flame is detected by a pilot flame for detecting incomplete combustion. The thermocouple may be heated. In addition, when a storage battery (charging) is used as a battery power source, the amount of charge becomes insufficient if combustion and stoppage for a short time are repeated. Therefore, the method of saving battery power according to the present invention is particularly effective. It becomes.

[0036]

As described above in detail, according to the combustion apparatus of the present invention, in the initial stage of ignition, the continuous electromotive force of the primary thermocouple is utilized without depending on the combined electromotive force of the thermocouple. Discharge can be stopped immediately after ignition and the time for energizing the on-off valve can be reduced. Therefore, there is an excellent effect that battery power can be saved and battery life can be extended.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a combustion device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a combustion device according to a first reference example .

FIG. 3 is a circuit diagram of a combustion device according to a second reference example .

FIG. 4 is a flowchart of a combustion device according to a first reference example .

FIG. 5 is a flowchart of a combustion device according to a second reference example .

FIG. 6 is a relationship diagram between electromotive force and time of the combustion device according to the first reference example .

FIG. 7 is a diagram showing a relationship between electromotive force and time of a conventional combustion device.

FIG. 8 shows a shield plate or the like of a secondary thermocouple of the combustion device according to the embodiment of the present invention .

FIG. 9 is a schematic view of a conventional combustion device.

[Explanation of symbols]

1: Primary thermocouple 2. Secondary thermocouple 3. First FET 4. Burner 5. Controller 6 Second FET 7 ... electrode 8 ... Thermocouple side holding coil 9 Battery holding coil

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 5/10

Claims (1)

(57) [Claims] 1. A heat exchanger heated by combustion heat from a burner, an on-off valve for opening and closing a gas flow path to the burner, and an igniter for continuously discharging and igniting fuel gas ejected from the burner by battery power. A combustion chamber formed between the heat exchanger and the burner; a primary thermocouple that is heated by the combustion flame of the burner to output a thermoelectromotive force; and exhaust gas from an exhaust clogging detection opening provided in the combustion chamber. A secondary thermocouple that is heated by heat and outputs a thermoelectromotive force, and the primary thermocouple and the secondary thermocouple are connected in series with opposite polarities, and the thermoelectromotive force synthesized by the series connection is equal to or higher than a predetermined level. In the case of the above, in a combustion apparatus comprising: valve-opening and holding means for opening and holding the on-off valve; and forcible valve-opening and holding means for forcibly opening and holding the on-off valve by battery power at the beginning of ignition. Once started to a predetermined ambient temperature Until the heat of the burner or the exhaust heat is shielded to prevent a rise in the back electromotive force due to the secondary thermocouple, or to retract the secondary thermocouple from a predetermined position to prevent a rise in the back electromotive force. A combustion device comprising a moving body.