JPH0740836Y2 - Overheat prevention device for combustion equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is directed to a fuel when a combustion chamber of a gas combustion device, an oil combustion device, a heat exchanger, or the like is cracked due to abnormal overheating that may cause a fire. The present invention relates to an overheat prevention device for a combustion device that immediately stops the supply of fuel for safety.

[Prior Art] As a conventional overheat prevention device for a combustion equipment such as a water heater, for example, as shown in FIG. 8, a combustion chamber 1 ′ of the combustion equipment or an external rear surface of a heat exchanger 2 ′ is used. It is general to attach one glass tube or ceramic tube-sealed type thermal fuse 3'and connect the connection terminal of the thermal fuse 3'to a combustion control circuit or the like. There are also proposals that are scattered outside the combustion chamber and the heat exchanger.

[Problems to be solved by the invention]

For combustion equipment such as hot water heaters for commercial use that are frequently used, the combustion chamber or heat exchanger may overheat abnormally during continuous use for a long time, causing cracks, perforations, etc. Occurrence may occur, and hot combustion gas may leak from the cracks and holes to damage the outer shell and cause a fire. However, one thermal fuse in the above-mentioned conventional technique may be installed outside the combustion chamber or the heat exchanger. The one mounted on the rear surface has a problem that the thermal fuse does not operate if a crack, a hole, etc., due to abnormal overheating is far from the thermal fuse. In the case of a large number of thermal fuses installed outside the combustion chamber and heat exchanger, there are often localized cracks and holes due to abnormal overheating. From temperature hugh Does not always sense this and operate reliably, but it does not deal with cracks, perforations, etc. at unspecified places because it only complements the above-mentioned drawbacks of mounting one thermal fuse, Moreover, since it is necessary to attach a plurality of temperature fuses to a plurality of places outside the combustion chamber or the heat exchanger, not only the workability is significantly deteriorated, but the work such as wiring and assembly requires a great deal of labor and technology. However, there was a problem such as an increase in cost.

The present invention has been made in view of such problems of the conventional technology,
It is an object of the present invention to provide a device for preventing overheating of a combustion device that operates quickly and reliably regardless of the location of cracks, holes, etc. due to abnormal overheating in the combustion chamber, heat exchanger, etc.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the invention of claim 1 in the device for preventing overheating of a combustion device according to the present invention is the entire range of at least one of the rear surface, front surface and side surface outside the combustion chamber of the combustion device and the heat exchanger. Characterized in that a series of linear bodies made of low-temperature molten metal that is electrically conductive and melts at a preset temperature are bent and arranged, and the linear bodies are incorporated into a combustion control circuit. According to the invention of claim 2, a series of linear bodies are arranged so as to be bent over the entire range of the outer rear surface of the combustion chamber and the heat exchanger, and the invention of claim 3 is a series of linear bodies. Is arranged so as to be bent over the entire range of the combustion chamber and the outer front surface of the heat exchanger, and the invention of claim 4 is to provide a series of linear bodies over the entire range of the outer rear surface and both side surfaces of the combustion chamber and the heat exchanger. The invention of claim 5 is arranged so as to be bent, and the series of linear members is arranged to be bent in the entire range of the outer peripheral surface of the combustion chamber and the heat exchanger. , The invention of claim 6 is obtained by forming into a sheet by printing a series of linear conductors on the substrate.

[Action]

In a device according to claim 1 of the overheat prevention device for a combustion device according to the present invention having the above-mentioned structure, a series of linear bodies made of a low temperature molten metal which is electrically conductive and melts at a preset temperature is burned. Since it is arranged so as to be bent over the entire range of at least one of the rear surface, the front surface and the side surface outside the chamber and the heat exchanger,
Even if cracks, holes or the like due to abnormal overheating occur in unspecified parts of the combustion chamber and the heat exchanger, a series of linear bodies immediately detect this and melt down. Further, since the linear body is incorporated in the combustion control circuit, when the linear body is melted, the power supply to the combustion control circuit is cut off, the fuel control valve is closed, and the fuel supply is stopped.

According to the second aspect of the present invention, since the series of linear members are arranged so as to be bent over the entire range of the combustion chamber and the outer rear surface of the heat exchanger, cracks and the like due to abnormal overheating are generated in the combustion chamber and the rear portion of the heat exchanger. Regardless of where it occurs, a series of linear bodies immediately sense it and melt it. According to the third aspect of the present invention, since the series of linear bodies are arranged so as to be bent in the entire range of the combustion chamber and the outer front surface of the heat exchanger, cracks and the like due to abnormal overheating are generated in the front portion of the combustion chamber and the heat exchanger. Regardless of the position, the linear body immediately senses this and melts. In the invention according to claim 4, since a series of linear bodies are arranged so as to be bent in the entire range of the outer rear surface and both side surfaces of the combustion chamber and the heat exchanger, cracks and the like due to abnormal overheating are generated in the combustion chamber and the heat exchanger. Regardless of the position on the rear side or both sides, a series of linear bodies immediately senses this and melts. In the invention according to claim 5, since the series of linear bodies are arranged so as to be bent over the entire outer peripheral surface of the combustion chamber and the heat exchanger, cracks and the like due to abnormal overheating are generated in the combustion chamber and the heat exchanger. Even if it occurs at any position on the entire circumference, a series of linear bodies immediately senses this and melts.

In the invention according to claim 6, a series of linear conductors printed on the base material is arranged in the entire range of at least one of the rear surface, the front surface and the side surface outside the combustion chamber and the heat exchanger. If a crack or the like occurs anywhere outside the combustion chamber and the heat exchanger within the above range, the series of linear conductors immediately senses it and melts it.

〔Example〕

An embodiment of an overheat prevention device in a combustion device according to the present invention will be described below with reference to the drawings.

The embodiment is an example in which the overheat prevention device of the present invention is applied to a wall-mounted forced air supply type gas water heater.

Embodiment 1 In FIGS. 1 to 3, reference numeral 1 is a combustion chamber of a gas water heater, and a water supply pipe 4 is spirally wound around the outer surface of the combustion chamber and the inlet side of a heat absorption pipe 5 of a heat exchanger 2 provided on the upper side thereof. And a gas burner 6 is installed in the lower part of the heat exchanger 2 to superheat the heat exchanger 2 to superheat the temperature of the cold water flowing through the endothermic pipe 5 of the heat exchanger 2 to raise the outlet of the endothermic pipe 5. Hot water is supplied from a hot water supply pipe 4a connected to the side to a sink or a bathtub. An air supply chamber 7 is hermetically connected to the lower part of the combustion chamber 1, and a duct 9 of an air supply fan 8 is connected and opened at the bottom of the air supply chamber 7.
In addition, a perforated baffle plate 10 is provided between the bottom of the air supply chamber 7 and the gas burner 6, and the air from the air supply fan 8 is rectified by the perforated baffle plate 10 and forcedly supplied as combustion air for the gas burner 6. I am trying to do it.

Reference numeral 3 denotes a series of linear bodies made of low-temperature molten metal or the like which is electrically conductive and melts at a preset temperature. The linear bodies 3 are bent only in the entire outer rear surface of the combustion chamber 1 and the heat exchanger 2. Then, both ends thereof are connected to a combustion control circuit or the like via lead wires 11 to incorporate the linear body 3 into the combustion control circuit or the like. As the low-temperature molten metal, for example, lead, tin, or an alloy of tin and lead is used, and its set temperature (melting point) is, for example, 120 ° C to 2 ° C.
It is a safe temperature of about 00 ℃. In addition, as illustrated in FIG. 3, the series of linear bodies 3 are bent in a meandering shape and arranged evenly over the entire area of the outer rear surface of the combustion chamber 1 and the heat exchanger 2, and other arbitrary shapes may be used. You are free to do it.

In the figure, 12 is an exhaust tube, 13 is an outer case, 14 is a heat insulating material provided inside the outer case 13, and 15 is an air intake port provided in the outer case 13.

In the above configuration, even if a crack or the like occurs at any position in the entire range of at least one of the rear surface, the front surface, and the side surface of the rear portion of the combustion chamber 1 and the heat exchanger 2 due to abnormal overheating with a risk of fire, for example, , A corresponding part of a series of linear bodies 3 which are bent in a meandering shape and are evenly arranged over the entire range of the rear part of the combustion chamber 1 and the heat exchanger 2 immediately senses this and melts down. The fuel control valve is closed and the fuel supply is stopped when the power is cut off for safety.

Example 2 In FIG. 4, a series of linear bodies 3 are arranged so as to be bent only over the entire area of the outer front surface of the combustion chamber 1 and the heat exchanger 2, and cracks and the like due to abnormal overheating that may cause a fire may occur. Even if it occurs at any position in the front of the combustion chamber 1 and the heat exchanger 2, for example,
A series of linear bodies 3 bent in a meandering shape and arranged evenly over the entire area of the front part of the combustion chamber 1 and the heat exchanger 2 are designed to immediately detect this and melt down. Since other configurations and operations are the same as those of the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

Example 3 In FIG. 5, a series of linear bodies 3 are arranged in a bent manner over the entire outer rear surface and both side surfaces of the combustion chamber 1 and the heat exchanger 2,
Combustion chamber 1 due to cracks caused by abnormal overheating that may cause fire
And, even if it occurs at any position of the rear portion and both side portions of the heat exchanger 2, for example, it is bent in a meandering shape and arranged uniformly over the entire range of the rear portion and both side portions of the combustion chamber 1 and the heat exchanger 2. The corresponding portion of the linear body 3 is immediately detected and blown out. Since the other constructions and operations are the same as those of the first embodiment, the same portions are designated by the same reference numerals and the description thereof will be omitted. .

Example 4 In FIG. 6, a series of linear bodies 3 are arranged so as to be bent over the entire outer peripheral surface of the combustion chamber 1 and the heat exchanger 2, and cracks due to abnormal overheating that may cause a fire are generated. Is generated at any position of the combustion chamber 1 and the entire circumference of the heat exchanger 2,
A series of linear bodies 3 spirally wound and evenly arranged over the entire circumference of the combustion chamber 1 and the heat exchanger 2 senses this instantly and melts it. Since other configurations and operations are the same as those in the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

Example 5 A plate-like body formed by printing a series of linear bodies 3 on a base material 18 to form a sheet is a whole range of at least one of the rear surface, front surface and side surface outside the combustion chamber 1 and the heat exchanger 2. For example, by arranging in place of the linear body shown in FIGS. 1 to 6, cracks or the like due to abnormal overheating which may cause a fire may be located at any position on the outer periphery of the combustion chamber 1 and the heat exchanger 2. Even if it occurs, the corresponding portion of the series of linear conductors 3 immediately senses this and melts it.

[Effect of device]

In the device for overheating prevention of the combustion equipment according to the present invention, the cracks, perforations and the like due to abnormal overheating are in the entire range of at least one of the rear surface, front surface and side surface outside the combustion chamber and the heat exchanger. Even if it occurs in an unspecified place, the corresponding part of the series of linear bodies made of low temperature molten metal immediately senses this and melts it off and cuts off the power supply to the combustion control circuit etc. to close the fuel control valve and stop the fuel supply. Therefore, if a crack or the like occurs due to abnormal overheating that may cause a fire, the safety of an industrial hot water heater, etc., which is frequently used, should be increased in order to prevent the occurrence of a fire in a prompt and reliable manner. You can Further, since the work of wiring and assembling is extremely simple, the workability is improved and the cost is reduced.

According to the second aspect of the present invention, even if cracks, perforations, etc. due to abnormal overheating occur at any position (unspecified local position) in the rear part of the combustion chamber, heat exchanger, etc. Since it is immediately sensed and melted, it is particularly effective when applied to combustion equipment such as a water heater directly attached to a wall surface such as a wall-hanging type. If a hole or the like is generated at any position (unspecified local position) in the front of the combustion chamber or the heat exchanger, a series of linear bodies immediately senses this and melts down. -Type water heaters and other combustion equipment have a small installation space, so there is a relatively large space behind the combustion equipment due to the relationship with gas pipes, etc., but it is applicable when the front side is close to a wall, etc. Is effective. Further, in the invention according to claim 4, a series of linear bodies is formed irrespective of whether cracking perforation or the like due to abnormal overheating occurs at any position (unspecified local position) at the rear and both sides of the combustion chamber and the heat exchanger. However, the invention is effective when applied not only to a wall-mounted combustion device, but also to a case where both sides of the combustion device are close to a wall or the like. Even if cracks, holes, etc. are generated at any position (unspecified local position) on the entire circumference of the combustion chamber, heat exchanger, etc., a series of linear bodies immediately detect this and melt down. It is effective when applied to various types of combustion equipment such as wall-mounted type and floor-mounted type. Further, in addition to the effects of the inventions of claims 1 to 5, the invention of claim 6 is easy to assemble.

[Brief description of drawings]

FIG. 1 is a vertical side view of the first embodiment, and FIG. 2 is X- of FIG.
FIG. 3 is a cross-sectional plan view of the second embodiment, FIG. 5 is a cross-sectional plan view of the third embodiment, and FIG. 6 is a cross-sectional plan view of the fourth embodiment. FIG. 7 is a cross-sectional plan view, FIG. 7 is a front view of the fifth embodiment, and FIG. 8 is a vertical sectional side view of a conventional example. 1 ... Combustion chamber, 2 ... Heat exchanger, 3 ... Linear body.

Claims (6)

[Scope of utility model registration request] 1. A combustion chamber (1) and a heat exchanger (2) of a combustion device.
A series of linear bodies (3) made of low-temperature molten metal, which is electrically conductive and melts at a preset temperature, is arranged in a bent manner in the entire range of at least one of the rear surface, front surface, and side surface outside the An overheat prevention device for a combustion device, characterized in that the linear body (3) is incorporated into a combustion control circuit to shut off fuel when the linear body is melted. 2. A device for overheating prevention of combustion equipment according to claim 1, wherein a series of linear bodies (3) are arranged so as to be bent over the entire outer rear surface of the combustion chamber (1) and the heat exchanger (2). . 3. A device for overheating prevention of combustion equipment according to claim 1, wherein a series of linear bodies (3) are arranged so as to be bent in the entire range of the outer front surface of the combustion chamber (1) and the heat exchanger (2). . 4. A combustion apparatus according to claim 1, wherein a series of linear bodies (3) are arranged so as to be bent over the entire outer rear surface and both side surfaces of the combustion chamber (1) and the heat exchanger (2). Overheat prevention device. 5. Overheating of combustion equipment according to claim 1, wherein a series of linear bodies (3) are arranged in a bent manner over the entire outer peripheral surface of the combustion chamber (1) and the heat exchanger (2). Prevention device. 6. The overheat prevention device for a combustion device according to claim 1, wherein a series of linear conductors (3) is printed on the base material (18) to form a sheet.