JP3792326B2 - Combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion apparatus capable of detecting combustion exhaust gas that leaks when a combustion cylinder is damaged and immediately stopping combustion.
[0002]
[Prior art]
In a combustion apparatus such as a hot water supply apparatus, a combustion chamber between a heat exchange unit and a combustion unit is surrounded by a combustion cylinder. This combustion cylinder is exposed to a high temperature during hot water supply, and returns to a low temperature when hot water supply is stopped. Therefore, the combustion drum is susceptible to thermal fatigue. If used for a long period of time, damage such as cracks may occur. This damage to the combustion cylinder causes the combustion exhaust gas to leak, and when the hot water supply device is installed on the wall of the house, this wall is abnormally heated with the combustion exhaust gas.
[0003]
Therefore, conventionally, a double heat safety is ensured by arranging a heat shield plate between the combustion cylinder and the wall and providing a thermal fuse between the combustion cylinder and the heat shield plate. When flue gas leaks from a damaged part of the combustion cylinder, the heat shield prevents abnormal heating of the wall and detects it with a thermal fuse to stop combustion.
Various proposals have been made for the installation of this thermal fuse, but there are drawbacks such as an increase in the number of parts, a complicated configuration, and complicated installation work due to the installation of the thermal fuse. It was.
[0004]
In the hot water supply apparatus disclosed in Japanese Utility Model Laid-Open No. 62-69765, the above-mentioned temperature fuse can be installed with a simple structure and good workability. Hereinafter, this hot water supply apparatus will be described in detail. A water supply pipe is wound around the combustion drum as in a general hot water supply apparatus. This water supply pipe is connected to the heat exchanging section and allows water passing toward the heat exchanging section to pass therethrough. The water supply pipe is supported on the combustion cylinder by a metal attachment band. Both end portions of the attachment band are welded to the outer surface of the combustion cylinder, and the intermediate portion is disposed along the outer peripheral surface of the tube. On the other hand, a linear temperature fuse is wound around the outer circumference of the combustion cylinder by one turn along the water supply pipe. This thermal fuse is supported at the tip of an extension that extends along the outer surface of the combustion cylinder from one welded end of the mounting band. More specifically, it is sandwiched between the tip of this extension and the outer surface of the combustion cylinder.
In this way, by using the attachment band for fixing the water supply pipe also for supporting the thermal fuse, the number of parts can be reduced, and the attachment operation can be simplified.
[0005]
[Problems to be solved by the invention]
However, in the hot water supply apparatus of the above publication, since the thermal fuse is in contact with the combustion cylinder, the hot water supply is exposed to a relatively high temperature during hot water supply, and may deteriorate due to long-term use.
In particular, recently developed thermal fuses using organic material temperature-sensitive pellets are attracting attention because they can be blown immediately and reliably when they reach a set temperature. When it was used for a hot water supply apparatus, it was not possible to use it in practice due to significant deterioration due to long-term use.
[0006]
[Problems to be solved by the invention]
According to the first aspect of the present invention, a tube that is connected to the heat exchange unit and allows fluid to pass to the heat exchange unit is wound around the combustion cylinder that surrounds the combustion chamber between the heat exchange unit and the combustion unit. Fixed at a plurality of mounting bands that are spaced along the pipe and welded to the combustion cylinder, and further, in the vicinity of the combustion cylinder, the combustion exhaust gas leaking from the combustion cylinder is detected and In a combustion apparatus in which a thermal fuse is arranged to stop the combustion of
Is the mounting band made of copper, and a and the extension portion main unit, a part of the main portion is brazed to Rutotomoni the outer peripheral surface are arranged along the outer peripheral surface of the tube, the extension, the main the distal end extending from one end parts are separated from the combustion cylinder, the thermal fuse forms a linear, an insulating tube, a plurality of detection connected in series with each other while being accommodated at intervals in the insulating tube The detection part of the thermal fuse is supported in a state surrounded by the bent tip of the extension part of the mounting band, Thereby, the thermal fuse is supported in a state of floating from the combustion cylinder.
[0007]
According to a second aspect of the present invention, in the combustion apparatus according to the first aspect, the main portion has both flat end portions and an arc-shaped central portion, and both end portions of the main portion are welded to the combustion cylinder. central portion of the main portion is brazed to the outer peripheral surface of the tube, the extension of the attachment band, are inclined relative to the combustion cylinder, away from the tubes and the combustion cylinder toward the distal end of the extension It is characterized by extending.
According to a third aspect of the present invention, in the combustion apparatus according to the first or second aspect, the main part of the mounting band has a constant width, and the extension part has a narrower width than the main part.
According to a fourth aspect of the present invention, in the combustion apparatus according to any one of the first to third aspects, the combustion cylinder has a rectangular cross section, and at least a heat shield plate is provided at an interval on the house wall side of the combustion cylinder. is arranged, the thermal fuse is a substantially parallel to the tube, characterized in that it is arranged between the heat shield plate and the combustion cylinder.
According to a fifth aspect of the present invention, there is provided a combustion apparatus according to the first aspect, wherein a main portion of the attachment band is brazed along a lower end portion welded to the combustion cylinder and a lower half of the outer periphery of the pipe. And the extension portion extends upward from the contact portion.
[0008]
The invention according to claim 6 is the combustion apparatus according to any one of claims 1 to 5, wherein the thermal fuse detection part is inserted from (i) a cylindrical metal case and (ii) one end side of the metal case. A first fixed electrode insulated from the metal case; (iii) a second fixed electrode disposed at the other end of the metal case and electrically connected to the metal case; and (iv) A movable electrode in contact with the peripheral surface, (v) a temperature-sensitive pellet made of an organic material that is interposed between the other end of the metal case and the movable electrode and melts at a set temperature, and (vi) the movable electrode is placed in the metal case. biases from both sides, and when the thermal pellet is in a non-molten state is brought into contact with the movable electrode to the first fixed electrode, and a pair of spring separating the movable electrode from the first fixed electrode when the thermal pellet is melted It is characterized by.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a hot water supply device A (combustion device) is installed on a wall B of a house via a bracket C. The hot water supply apparatus A is configured by housing a main body 2 in a housing 1. The main body 2 is configured by connecting an exhaust unit 3, a heat exchange unit 4, a burner unit 5, and a fan 6 in order from the top. The burner unit 5 is configured by installing a burner 8 (combustion unit) in a frame 7.
[0010]
As shown in FIGS. 1 and 2, the heat exchange unit 4 includes a frame 10 having a rectangular cross section. A heat exchanging portion 11 is accommodated in the upper portion 10 a of the frame 10. The heat exchange unit 11 includes a large number of fins 12 and a heat receiving pipe 13 that passes through the fins 12. Outside the frame 10, one end of the heat supply pipe 13 is connected to one end of the heat receiving pipe 13, and one end of the hot water supply pipe 15 is connected to the other end. The water introduced from the water supply pipe 14 is heated in the process of passing through the heat receiving pipe 13 to become hot water, and is discharged from the hot water supply pipe 15.
[0011]
The lower part 10b of the frame 10 of the heat exchange unit 4 is provided as a combustion cylinder and surrounds the space between the heat exchange part 11 and the burner 8, that is, the combustion chamber 16, in an airtight manner. The water supply pipe 14 is spirally wound around the outer periphery of the combustion cylinder 10b, and the combustion cylinder 10b is cooled with water flowing inside.
[0012]
In the present embodiment, the water supply pipe 14 is wound twice on the wall B side surface of the combustion cylinder 10b, and the surface opposite to the wall B is wound once. In addition, the code | symbol 14a, 14b is attached to the pipe part by the side of the wall B of the water supply pipe 14 from the top. Similarly, the reference numeral 14c is attached to the tube portion opposite to the wall B.
A heat shield plate 17 is attached to the wall B side of the frame 10, and a pipe portion 14a of the water supply pipe 14 is formed in a space 18 between the heat shield plate 17 and the wall B side surface of the combustion cylinder 10b. , 14b are arranged.
[0013]
The pipe portions 14a and 14b of the water supply pipe 14 are fixed to the outer surface of the combustion cylinder 10b at a plurality of positions at intervals by a metal attachment band 20A (especially copper having good heat conduction is preferable). Similarly, each pipe portion 14c of the water supply pipe 14 is also fixed to the outer surface of the combustion cylinder 10b by the attachment band 20B.
[0014]
First, the attachment band 20B will be described. The attachment band 20B has a short band shape with a constant width, both end portions 22 and 23 are flat, and the central portion 24 has an arc shape. The pipe part 14c is temporarily fixed by spot-welding the both end parts 22 and 23 to the combustion cylinder 10b in a state where the central part 24 is attached to the outer periphery of the pipe part 14c.
[0015]
Next, the attachment band 20A will be described. As best shown in FIG. 5, the attachment band 20 </ b> A includes a main portion 21 and an extension portion 25. The main part 21 has the same shape and the same role as the mounting band 20B, and the same numbers 22 to 24 are assigned to the respective parts, and the description thereof is omitted. The extension portion 25 is formed to have a narrower width than the main portion 21 and extends obliquely downward from the lower end portion 23. In other words, it extends away from the combustion cylinder 10b and also away from the tube portions 14a and 14b to be fixed.
[0016]
After spot-welding the mounting bands 20A and 20B and temporarily fixing the pipe portions 14a to 14c, as shown by phantom lines in FIG. 2, the brazing rod 100 is placed on the pipe portions 14a to 14c and heated in a furnace, The tube portions 14a to 14c and the combustion cylinder 10b are brazed. The temporary fixing of the pipe portions 14a to 14c by the attachment bands 20A and 20B is to prevent the feed water pipe 14 from being displaced with respect to the combustion cylinder 10b during brazing in the furnace. . Therefore, after the brazing is finished, the role of temporarily fixing the attachment bands 20A and 20B is finished.
[0017]
By the way, as shown in FIG. 3, in a state where both end portions 22 and 23 of the attachment band 20A are spot-welded to the combustion cylinder 10b at the positions indicated by arrows, both end portions 22 and 23 of the attachment band 20A and the combustion cylinder 10b There is a slight gap (exaggerated in the drawing) between the center portion 24 of the mounting band 20A and the tube portions 14a and 14b. However, as shown in FIG. 4, during the brazing, the brazing material 101 is also supplied to these gaps by capillary action.
The brazing material is also supplied to the gaps between the attachment band 20B, the combustion cylinder 10b, and the pipe portion 14c.
[0018]
As shown in FIGS. 1 and 6, the distal end portion of the extension portion 25 of the mounting band 20 </ b> A is bent, and a linear temperature fuse 30 is supported here. The thermal fuse 30 is disposed in a space 18 between the combustion cylinder 10 b and the heat shield plate 17. The thermal fuse 30 is substantially parallel to the two tube portions 14a and 14b, and is bent in the middle to form a U shape. The thermal fuse 30 is disposed away from the pipe portions 14 a and 14 b of the water supply pipe 14. Further, the thermal fuse 30 floats from the outer surface of the combustion cylinder 10b.
[0019]
The thermal fuse 30 is incorporated in the control circuit 50 (FIG. 2), and when the thermal fuse 30 is blown, the control circuit 50 opens an electromagnetic valve (not shown) provided in the gas supply path to the burner 8. It closes and stops combustion.
[0020]
Next, the linear temperature fuse 30 will be described in detail. As shown in FIG. 7, the thermal fuse 30 is configured by connecting a plurality of detectors 31 in series via lead wires 32 and covering with an insulating tube 33.
As shown in FIG. 8, the detection unit 31 has a cylindrical metal case 35. End portions 32 a and 32 b (hereinafter referred to as a first fixed electrode and a second fixed electrode) of the lead wire 32 are inserted into both ends of the metal case 35. The first fixed electrode 32a is supported on the metal case 35 via a ceramic insulator 36, and the second electrode 32b is directly fixed to the metal case 35 and electrically connected thereto. A movable electrode 37 is accommodated in the metal case 35 so as to be movable in the axial direction while being in contact with the inner periphery of the metal case 35. A temperature sensitive pellet 38 made of an organic material is accommodated in the metal case 35 at the end on the second fixed electrode 32b side. Further, a compression coil spring 39 a is interposed between the insulator 36 and the movable electrode 37, and a compression coil spring 39 b is also interposed between the movable electrode 37 and the temperature sensitive pellet 38.
[0021]
As shown in FIG. 8, when the temperature sensitive pellet 38 of the detection unit 31 is in a non-molten state, the coil spring 39b overcomes the coil spring 39a, so that the movable electrode 37 is in contact with the first fixed electrode 32a. . Therefore, an electrical path is secured across the first fixed electrode 32a, the movable electrode 37, the metal case 35, and the second fixed electrode 32b.
When the ambient temperature reaches a set temperature, for example, 240 ° C., as shown in FIG. 9, the temperature-sensitive pellet 38 is melted, and the movable electrode 37 is separated from the first fixed electrode 32a by the force of the coil spring 39a. As a result, the fixed electrodes 32a and 32b are electrically disconnected.
Since this type of detection unit 31 uses an organic material for the temperature-sensitive pellet 38, it has high sensitivity and melts at the set temperature accurately and blocks. However, in order to guarantee the quality in the long term, it is necessary to keep the temperature at 140 ° C. or lower, for example. This is because if the temperature exceeds 140 ° C., the temperature-sensitive pellet 38 deteriorates.
[0022]
In this embodiment, the thermal fuse 30 has a total of six detection units 31. The detection unit 31 is positioned just at the distal end portion of the extension portion 25 of the attachment band 20 </ b> B, and is supported by being surrounded by the distal end portion of the extension portion 25 via the insulating tube 33.
[0023]
The installation work of the temperature fuse 30 will be described. When the water supply pipe 14 is fixed to the combustion cylinder 10b by spot-welding the mounting bands 20A and 20B to the outer surface of the combustion cylinder 10b and further performing the above-described brazing, as shown in FIG. The extension part 25 is in a state of extending straightly downward in the oblique direction. The thermal fuse 30 is attached so that the detection unit 31 is positioned at the distal end of the extension 25, and the thermal fuse 30 is attached by bending the distal end of the extension 25. Since the extension portion 25 is narrow and made of copper and relatively soft, the operator can bend it with a simple jig or with bare hands, and the operation is simple.
[0024]
In the hot water supply apparatus A having the above configuration, when a plug provided at the tip of the hot water supply pipe 15 is opened, water flows from the water supply pipe 14 to the hot water supply pipe 15 through the heat receiving pipe 13. This water flow is detected by a water flow switch (not shown) provided in the water supply pipe 14, and the control of the control circuit 50 that receives this detection signal opens the solenoid valve of the gas supply system and performs an ignition operation. . As a result, combustion is started in the burner 8. The combustion heat in the burner 8 is supplied to the heat exchanging section 11, and the water passing through the heat receiving pipe 13 is heated to become hot water and supplied to the hot water supply pipe 15.
[0025]
During the combustion, air is introduced from the air inlet 1a of the housing 1 and supplied to the burner 8 by driving the fan 6, and the combustion exhaust gas generated in the burner 8 passes through the combustion cylinder 10b and passes through the heat exchanging parts 11, The gas is discharged from the exhaust top 1b through the exhaust unit 3.
[0026]
The combustion cylinder 10b is exposed to a high temperature during combustion, and cools when the combustion is finished. Thermal fatigue occurs with the repetition. In the vicinity of the pipe portions 14a to 14c of the water supply pipe 14, the water is cooled by the water flowing through the pipe portions 14a to 14c, so that the temperature at the time of combustion does not increase and thermal fatigue is small, but the pipe portions 14a to 14c are separated from each other. The portion located between the tube portions 14a to 14c is likely to be thermally fatigued because of the high temperature during combustion.
[0027]
If a crack occurs in the combustion cylinder 10b due to thermal fatigue, combustion exhaust gas leaks from here. Since the leaked combustion exhaust gas is blocked by the heat shield plate 17, temporary abnormal heating of the wall B can be prevented. Moreover, the detection part 31 of the thermal fuse 30 is heated by this leaked combustion exhaust gas, and the temperature sensitive pellet 38 inside melts. As a result, the thermal fuse 30 is disconnected, and in response to this, the control circuit 50 closes the solenoid valve of the gas supply path to forcibly stop the combustion. The control circuit 50 also activates an alarm. In this way, abnormal heating of the wall B can be reliably prevented.
[0028]
Since the thermal fuse 30 is disposed in the space 18 as described above, the leakage of the combustion exhaust gas can be reliably detected, and the wall B is more reliably prevented from being abnormally heated by the leakage of the combustion exhaust gas. be able to.
[0029]
As described above, the detection unit 31 of the thermal fuse 30 needs to be maintained at 140 ° C. or lower to prevent the temperature-sensitive pellet 38 from being deteriorated. However, the space 18 rises to a temperature higher than the temperature at which the temperature-sensitive pellet 38 deteriorates due to the heat released from the combustion cylinder 10b. That is, in the vicinity of the pipe portions 14a and 14b of the water supply pipe 14 of the combustion cylinder 10b, the surface temperature is almost close to the water temperature, whereas in the middle position between the pipe portions 14a and 14b, the surface temperature rises to near 150 ° C. To do. However, in this embodiment, deterioration of the temperature sensitive pellet 38 can be prevented for the following reason.
First, the detection part 31 of the thermal fuse 30 is supported by the tip of the extension part 25 of the mounting band 20A and floats from the combustion cylinder 10b. Therefore, it does not receive heat directly from the combustion cylinder 10b.
Secondly, the cooling effect by the water flowing through the water supply pipe 14 also reaches the thermal fuse 30 through the attachment band 20A made of copper having good heat conduction. And since the detection part 31 is located in the extension part 25 of this attachment band 20A, the said cooling effect of the detection part 31 reaches directly. As described above, the attachment band 20A and the pipe portions 14a and 14b of the water supply pipe 14 can ensure good thermal conductivity due to the interposition of the brazing material 101. Can be secured.
[0030]
10 and 11 show another embodiment of the present invention. In this embodiment, an inverted T-shaped mounting band 120 is used. A wide lower end 122 is spot-welded to the combustion cylinder 10b. The narrow portion has a contact portion 123 along the lower half of the outer periphery of the water supply pipe 14 and an extension portion 125 extending upward from the contact portion 123. The upper end portion (tip portion) of the extension portion 125 is bent to hold the detection portion of the thermal fuse 30. In the present embodiment, the main portion 121 is configured by the lower end portion 122 and the attachment portion 123. A gap between the lower end portion 122 and the combustion cylinder 10 b and between the contact portion 123 and the water supply pipe 14 is filled with the brazing material 101.
In this embodiment, the extension 125 extends directly from the contact portion 123 in contact with the water supply pipe 14 without passing through the portion in contact with the combustion cylinder 10b, so that the cooling effect by the water supply pipe 14 is further improved. Can be transmitted to the thermal fuse 30.
[0031]
The present invention is not limited to the above embodiments, and various forms are possible. For example, the linear thermal fuse may be installed not only on the wall side of the combustion cylinder but also on the front side. Further, the linear temperature fuse may be wound once around the entire circumference of the combustion cylinder, or may be wound a plurality of times. The heat shield plate may be installed not only on the wall side of the combustion cylinder but also on the entire circumference.
As the linear thermal fuse, an ordinary linear molten material covered with an insulating tube may be used.
One or more normal thermal fuses that are not linear may be used.
[0032]
【The invention's effect】
As described above, according to the invention of claim 1, the mounting band for fixing the tube to the combustion cylinder is also used for supporting the thermal fuse, so that the number of parts can be reduced and the configuration is simplified. Can be Further, since the thermal fuse is supported by bending the tip of the extension portion of the attachment band, the operation of installing the thermal fuse is also easy. In addition, since the thermal fuse is supported by floating from the combustion cylinder, it is possible to avoid the thermal fuse from being exposed to a relatively high temperature, and a cooling effect by the fluid flowing through the tube can also be expected. Can be prevented. In addition, the linear temperature fuse is composed of a plurality of detectors, and these detectors are located in the extension part of the attachment band, so that the cooling effect by the fluid of the tube can be effectively received.
According to the invention of claim 2, the thermal fuse can be installed at a position away from the tube, that is, at a position corresponding to a place where a crack or the like is likely to occur in the combustion cylinder, and the leakage of the combustion exhaust gas can be more reliably prevented. Can be detected.
According to invention of Claim 3, since the extension part is narrow, the bending process of a front-end | tip part is easy.
According to the invention of claim 4, since the heat shield is arranged on the house wall side of the combustion drum and the linear temperature fuse is arranged, it is possible to reliably prevent abnormal heating of the house wall due to leakage of combustion exhaust gas. Can do. The thermal fuse is disposed in a space where heat is easily trapped between the combustion cylinder and the heat shield plate, but deterioration can be reliably prevented by the cooling effect of the fluid flowing through the pipe.
According to the sixth aspect of the present invention, since the temperature fuse detector uses the organic material temperature-sensitive pellet, it can be surely blown when the temperature reaches the set temperature.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a hot water supply apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a heat exchange unit of the hot water supply apparatus.
FIG. 3 is an enlarged cross-sectional view showing a state of attachment of the attachment band to the combustion cylinder after spot welding and before brazing.
FIG. 4 is an enlarged cross-sectional view showing a mounting state of the mounting band to the combustion cylinder after brazing.
FIG. 5 is an enlarged perspective view of an attachment band for fixing a water supply pipe, showing a state before attaching a thermal fuse.
FIG. 6 is an enlarged perspective view of the mounting band, showing a state after the thermal fuse is mounted.
FIG. 7 is a side view of a thermal fuse.
FIG. 8 is an enlarged cross-sectional view showing a non-blown state of the detecting portion of the thermal fuse.
FIG. 9 is an enlarged cross-sectional view showing a state after fusing of the detecting portion of the thermal fuse.
FIG. 10 is a front view of an essential part showing another embodiment of the present invention.
FIG. 11 is a longitudinal sectional view of the same embodiment.
[Explanation of symbols]
8 Burner (combustion section)
10b Combustion cylinder 11 Heat exchange part 14 Water supply pipe (pipe)
20A, 120 Attachment band 21, 121 Main part 25, 125 Extension part 30 Thermal fuse 31 Detection part 32a First fixed electrode 32b Second fixed electrode 33 Insulating tube 35 Metal case 37 Movable electrodes 39a, 39b Spring

Claims (6)

A tube that is connected to the heat exchange unit and allows fluid to pass to the heat exchange unit is wound around the combustion cylinder that surrounds the combustion chamber between the heat exchange unit and the combustion unit, and the tube is spaced along the tube. And is fixed by a plurality of attachment bands welded to the combustion cylinder, and further, in the vicinity of the combustion cylinder, detecting combustion exhaust gas leaking from the combustion cylinder and stopping combustion in the combustion section In a combustion device in which a thermal fuse is arranged,
Is the mounting band made of copper, and a and the extension portion main unit, a part of the main portion is brazed to Rutotomoni the outer peripheral surface are arranged along the outer peripheral surface of the tube, the extension, the main Extending from one end of the part, its tip is away from the combustion cylinder,
The thermal fuse is linear, and has an insulating tube and a plurality of detection units that are accommodated in the insulating tube at intervals and connected in series with each other, so that the detection unit is blown at a set temperature. And
The thermal fuse detection part is supported in a state surrounded by the bent tip of the extension part of the mounting band, and thereby the thermal fuse is supported in a state of floating from the combustion cylinder. Combustion device. The main part has both flat end parts and an arc-shaped central part, both end parts of the main part are welded to the combustion cylinder, the central part of the main part is brazed to the outer peripheral surface of the pipe,
2. The combustion according to claim 1, wherein the extension part of the attachment band is inclined with respect to the combustion cylinder and extends away from the pipe and the combustion cylinder toward the tip of the extension part. apparatus.   The combustion apparatus according to claim 1 or 2, wherein the main part of the attachment band has a constant width, and the extension part has a narrower width than the main part. The combustion cylinder has a rectangular cross section, and a heat shield is disposed at least on the wall side of the combustion cylinder at the house wall , and the thermal fuse is substantially parallel to the tube and is shielded from the combustion cylinder. The combustion apparatus according to any one of claims 1 to 3, wherein the combustion apparatus is disposed between the heating plate and the heat plate.   The main part of the mounting band has a lower end welded to the combustion cylinder, and an attachment part brazed along the lower half of the outer periphery of the pipe, and the extension part is located above the attachment part. The combustion apparatus according to claim 1, wherein the combustion apparatus extends. The thermal fuse detector is
(I) a cylindrical metal case;
(Ii) a first fixed electrode inserted from one end of the metal case and insulated from the metal case;
(Iii) a second fixed electrode disposed at the other end of the metal case and electrically connected to the metal case;
(Iv) a movable electrode in contact with the inner peripheral surface of the metal case;
(V) a temperature-sensitive pellet made of an organic material that is interposed between the other end of the metal case and the movable electrode and melts at a set temperature;
(Vi) The movable electrode is energized from both sides in the metal case. When the temperature sensitive pellet is not melted, the movable electrode is brought into contact with the first fixed electrode. When the temperature sensitive pellet is melted, the movable electrode is fixed first. A pair of springs away from the electrodes;
Combustion device according to any one of claims 1 to 5, characterized in that it comprises a.

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