JP2515049Y2 - Overheat prevention device for combustion equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention discloses that cracks, perforations, etc. are generated in a combustion chamber of gas combustion equipment, oil combustion equipment, etc. The present invention relates to an overheat prevention device for a combustion device that immediately stops the supply of fuel to ensure safety.

[Conventional technology]

As a conventional overheat prevention device for a combustion equipment such as a water heater, for example, as shown in FIG. 11, one glass tube is provided on the outer rear surface of the combustion chamber 1'or the heat exchanger 2'of the combustion equipment. Or ceramic tube sealed type thermal fuse 3 '
It is general that the temperature fuses 3'are connected to the connection terminals of the thermal fuse 3'to a combustion control circuit or the like, but a plurality of thermal fuses are scatteredly provided outside the combustion chamber and the heat exchanger. Things are also proposed.

[Problems to be solved by the device]

In the case of frequently used equipment such as commercial water heaters and other combustion equipment, the heating parts of the combustion chamber, heat exchanger, etc. abnormally overheat during continuous use for a long time, causing cracks and holes. Opening may occur, and high-temperature combustion gas may leak from the cracks and holes to burn the outer case and cause a fire. The one attached to the outer rear surface of the reactor has a problem that the thermal fuse does not operate if a crack, a hole or the like due to abnormal overheating is distant from the thermal fuse, and more than one thermal fuse is installed in the combustion chamber. Also, in the case of dispersely arranged outside the heat exchanger, even if many temperature fuses are mounted outside the combustion chamber and outside the heat exchanger, cracks, holes, etc. due to abnormal overheating are localized. Because there are many The fuse does not always sense this and operate reliably, but it does not deal with cracks, holes, etc. at unspecified places because it only supplements the above-mentioned drawbacks even though one thermal fuse is attached. 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, the work such as wiring and assembly requires a great deal of time and technique, and the workability is not only significantly deteriorated. However, there was a problem that the cost was high.

In view of the problems of the conventional technology, the present invention operates quickly and reliably regardless of the location of cracks, holes, etc. due to abnormal overheating in the combustion chamber, the heating section of the heat exchanger, etc. The purpose of the present invention is to provide an overheat prevention device for a combustion device.

[Means for solving the problem]

In order to achieve the above-mentioned object, the invention of claim 1 in the overheat prevention device for a combustion device according to the invention is a temperature-resistance device such as a metal or a thermistor outside a heating part such as a combustion chamber or a heat exchanger of the combustion device. A series of linear bodies consisting of objects having characteristics are arranged, the linear bodies are incorporated into a combustion control circuit, and the resistance change due to the temperature change of the linear bodies is captured to detect fuel when abnormal overheating is detected. It is characterized by blocking.

According to a second aspect of the present invention, the series of linear bodies is arranged on an outer rear surface of a heating portion such as a combustion chamber or a heat exchanger,
The invention of claim 4 arranges the series of linear bodies on the outer front surface of a heating portion such as a combustion chamber or a heat exchanger, and the invention of claim 4 arranges the series of linear bodies of the combustion chamber, a heat exchanger, or the like. The heating unit is disposed on the outer rear surface and both side faces, and the invention of claim 5 is characterized in that the series of linear bodies is disposed on the entire outer peripheral surface of the heating unit such as a combustion chamber or a heat exchanger. And

Furthermore, the invention of claim 6 forms a sheet by printing the above-mentioned series of linear bodies on a plate-shaped substrate in an arbitrary shape evenly arranged at respective portions, and forming a sheet-shaped substrate. It is characterized in that the above-mentioned series of linear bodies are arranged evenly in each part in an arbitrary shape and the surface thereof is gripped by a thin plate material in a pack shape to form a sheet shape.

[Action]

In the 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 an object having a temperature-resistance characteristic such as metal or thermistor is provided in a combustion chamber, Since it is installed outside the heating part such as a heat exchanger, the temperature of a series of linear objects will not be affected by cracks or holes due to abnormal overheating in any part of the combustion chamber or the heating part such as a heat exchanger. Immediately detect abnormal overheating by capturing resistance changes due to changes. Further, since the linear body is incorporated in the combustion control circuit, when the linear body detects abnormal overheating, the power supply to the combustion control circuit is cut off, the fuel control valve is closed, and the fuel supply is stopped.

Further, in the invention according to claim 2, since the series of linear bodies is arranged on the outer rear surface of the heating portion such as the combustion chamber and the heat exchanger,
If a crack, a hole, or the like due to abnormal overheating occurs at any position in the rear part of the heating portion such as the combustion chamber or the heat exchanger, a series of linear bodies immediately detect this. According to the third aspect of the invention, since the series of linear bodies is arranged on the outer front surface of the heating portion of the combustion chamber, the heat exchanger, etc., cracks, perforations, etc. due to abnormal overheating are generated in the combustion chamber, the heat exchanger, etc. Even if it occurs at any position on the front part of the heating part, the series of linear bodies immediately detect this. In the invention according to claim 4, since the series of linear bodies are arranged on the outer rear surface and both side surfaces of the heating portion such as the combustion chamber and the heat exchanger, cracks, perforations and the like due to abnormal overheating may occur in the combustion chamber and the heat chamber. A series of linear bodies immediately detect the occurrence of any position on the rear side and both sides of the heating part such as the exchanger. In the invention according to claim 5, since the series of linear bodies is arranged on the entire outer peripheral surface of the heating portion such as the combustion chamber and the heat exchanger, cracks due to abnormal overheating,
If a perforation or the like occurs at any position of the entire circumference of the heating portion such as the combustion chamber and the heat exchanger, the series of linear bodies immediately detect this.

Further, according to the invention as set forth in claim 6, the above-mentioned series of linear bodies formed into a sheet shape as a whole by uniformly arranging and printing each portion on a plate-shaped substrate in an arbitrary shape is used for heating a combustion chamber, a heat exchanger or the like. If it is installed outside the heating section, a series of linear bodies will immediately generate cracks, holes, etc. due to abnormal heating at any position on the outer circumference of the heating section such as the combustion chamber and heat exchanger. Detect. According to a seventh aspect of the present invention, a series of linear bodies, which are arranged in a plate-shaped base material in an arbitrary shape and are evenly arranged, and the surface of which is held in a pack shape by a thin plate material, are formed into a sheet shape as a whole in a combustion chamber and a heat chamber. If it is installed outside the heating part such as a exchanger, a series of linear objects will be generated even if cracks or holes due to abnormal overheating occur at any position on the outer periphery of the heating part such as the combustion chamber or heat exchanger. Detects this immediately.

〔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 heat the heat exchanger 2 to heat and heat the cold water flowing through the endothermic pipe 5 of the heat exchanger 2 to raise the temperature of the outlet of the endothermic pipe 5. Hot water supply pipe 4a connected to the side
It is designed to supply hot water to a sink or 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 filaments made of an object such as metal and thermistor having a temperature-resistance characteristic, which is disposed only on the outer rear surface of the heating portion such as the combustion chamber 1 and the heat exchanger 2 and has both ends thereof. It is connected to a combustion control circuit or the like via a lead wire 11, and the linear body 3 is incorporated in the combustion control circuit or the like as illustrated in FIG. In FIG. 10, C is a combustion control circuit, V is a fuel control valve, E is a comparator, and Rx = Ra · Rc / Rb is the judgment value, and the output increases as the sensor resistance increases. is there. Further, for example, tungsten or the like is used as the metal having the temperature-resistance characteristic, and the thermistor having the temperature-resistance characteristic illustrated in FIG. 9 is used. Further, as shown in FIG. 3, the series of filaments 3 are bent in a meandering shape and arranged so as to be evenly positioned over the entire outer rear surface of the heating portion such as the combustion chamber 1 and the heat exchanger 2. In addition to this, any other shape is also possible.

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 structure, even if cracks, holes, etc. occur at any position in the rear part of the heating portion such as the combustion chamber 1 and the heat exchanger 2 due to abnormal overheating that may cause a fire, for example, it bends in a meandering shape. Corresponding parts of a series of filaments 3 arranged evenly over the entire range of the rear part of the heating part such as the combustion chamber 1 and the heat exchanger 2 capture the resistance change due to temperature change and immediately detect this. Therefore, the energization of the combustion control circuit C is cut off, the fuel control valve V is closed, and the fuel supply is stopped to ensure safety.

Example 2 In FIG. 4, a series of filaments 3 are provided only on the outer front surface of the heating portion of the combustion chamber 1, the heat exchanger 2, etc., and cracks, perforations, etc. due to abnormal overheating that may cause a fire. Is the combustion chamber 1,
Even if it occurs at any position in the front part of the heating part such as the heat exchanger 2, for example, it bends in a meandering shape and the combustion chamber 1, the heat exchanger 2
The corresponding part of the series of linear members 3 arranged evenly over the entire area of the front part of the heating part such as etc. captures the resistance change due to the temperature change and immediately detects it. 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 filaments 3 are arranged on the outer rear surface and both side surfaces of the heating portion such as the combustion chamber 1 and the heat exchanger 2 so that cracks and holes due to abnormal overheating that may cause a fire may occur. Even if a perforation occurs at any of the rear portion and both sides of the heating portion such as the combustion chamber 1 and the heat exchanger 2, the heating portion such as the combustion chamber 1 and the heat exchanger 2 bends in a meandering shape. The corresponding portion of the series of filaments 3 arranged evenly over the entire range of the rear part and both side parts captures the resistance change due to the temperature change and immediately detects it. Since the configuration and the operation 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 4 In FIG. 6, a series of filaments 3 are arranged on the entire outer peripheral surface of the heating part of the combustion chamber 1, the heat exchanger 2, etc., and cracks and holes are formed due to abnormal overheating which may cause a fire. Etc. occur at any position of the entire circumference of the heating portion such as the combustion chamber 1 and the heat exchanger 2, the spiral winding is performed to form the combustion chamber 1, the heat exchanger 2 and the like.
The corresponding part of the series of filaments 3 arranged evenly over the entire circumference of the heating part captures the resistance change due to temperature change and immediately detects 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.

Fifth Embodiment In FIG. 7, a plate-like body formed into a sheet as a whole by printing a series of linear conductors 3 on a plate-like substrate 18 in a meandering or other arbitrary shape uniformly on each part is used as a combustion chamber 1. The heat exchanger 2 or the like is provided outside the heating portion, for example, in place of the linear body shown in FIGS. 1 to 6, and cracks, perforations, etc. due to abnormal overheating that may cause a fire may be generated in the combustion chamber 1. Whatever the position of the outer periphery of the heating part such as the heat exchanger 2 occurs, the corresponding part of the series of linear conductors 3 captures the resistance change due to the temperature change and immediately detects it. Is.

Example 6 In FIG. 7, for example, a series of filaments 3 are arranged evenly in a meandering or other arbitrary shape on a plate-shaped substrate 19 such as a polyester film, and packed with a thin plate material 20 such as a vinyl chloride film. A plate-like body that is gripped in a sheet shape and formed into a sheet shape as a whole is provided outside the heating portion such as the combustion chamber 1 and the heat exchanger 2 in place of, for example, the linear body shown in FIGS. 1 to 6. However, even if cracks, holes, etc. due to abnormal overheating that may cause a fire occur at any position on the outer peripheral portion of the combustion chamber, the heating part such as the heat exchanger 2, the temperature of the part of the linear body 3 changes. It is designed to detect the resistance change due to and to detect this immediately.

[Effect of device]

The invention according to claim 1 in the device for preventing overheating of a combustion device according to this invention is such that even if cracks, perforations, etc. due to abnormal overheating occur in the heating part of the combustion chamber, heat exchanger, etc. Detects the resistance change due to temperature change and immediately detects abnormal overheat, cuts off the power supply to the combustion control circuit and closes the fuel control valve to stop the fuel supply, so there is a risk of fire causing cracks and holes. When a perforation occurs,
Since it operates quickly and surely to prevent a fire from occurring, it is possible to enhance the safety of a commercial water heater or the like which is particularly frequently used. Also, unlike a fuse or the like, it can be used any number of times by resetting after operation, and the operating point can be arbitrarily selected according to the characteristics of the instrument. Further, the work of wiring and assembling is extremely simple, so that the workability is improved and the cost is reduced.

The invention according to claim 2 provides a series of lines even if cracks, perforations, etc. due to abnormal overheating occur at any position (unspecified local position) in the rear part of the heating part such as the combustion chamber or heat exchanger. Since the object immediately detects this, the present invention is particularly effective when applied to a combustion device such as a water heater installed directly on a wall surface such as a wall-hanging type. Even if cracks, holes, etc. occur at any position (unspecified local position) in the front part of the heating part such as the combustion chamber or heat exchanger, a series of linear bodies immediately detect it. Since there is a small installation space for combustion equipment such as floor-standing water heaters, there is a relatively large space behind the combustion equipment due to the relationship with gas pipes, but the front side is close to walls, etc. It is effective when applied to. The invention according to claim 4 is
If a crack or a hole due to abnormal overheating occurs at any position (unspecified local position) at the rear or both sides of the heating part of the combustion chamber, heat exchanger, etc., a series of linear bodies immediately Since it is detected, it is effective when applied to the case where both sides of the combustion device are close to a wall or the like as well as the wall-mounted combustion device.
The invention described in the above describes that when a crack, a hole, or the like due to abnormal overheating occurs at any position (unspecified local position) of the entire circumference of the heating part such as the combustion chamber and the heat exchanger, a series of linear objects is generated. Since this is immediately detected, it is effective when applied to various combustion equipment such as wall-mounted type and floor-standing type.

Further, the inventions according to claims 6 and 7 are the same as the above-mentioned claim 1.
In addition to the effect of the invention described in any one of 5 to 5, since it is formed in a sheet shape as a whole, its assembling work and the like are easy.

[Brief description of drawings]

FIG. 1 is a vertical side view of the first embodiment, and FIG. 2 is X- of FIG.
X-ray cross-sectional plan view, FIG. 3 is a front view of a filament, FIG. 4 is a cross-sectional plan view of Example 2, FIG. 5 is a cross-sectional plan view of Example 3, and FIG. FIG. 7 is a front view of the fifth embodiment, FIG. 8 is a front view of the sixth embodiment, FIG. 9 is a characteristic graph of the thermistor, and FIG. 10 is a circuit diagram showing an example of a combustion control circuit. FIG. 11 is a vertical sectional side view of a conventional example. 1 ... Combustion chamber, 2 ... Heat exchanger, 3 ... Linear body.

Claims (7)

(57) [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 an object having a temperature-resistance characteristic such as metal or thermistor is provided outside the heating part such as etc., and the linear body (3) is incorporated into a combustion control circuit. An overheat prevention device for a combustion device, characterized in that a resistance change due to a temperature change of the linear body (3) is captured to shut off fuel when an abnormal overheat is detected. 2. The series of linear bodies (3) are connected to a combustion chamber (1),
The overheat prevention device for a combustion device according to claim 1, wherein the overheat prevention device is provided on an outer rear surface of a heating portion such as a heat exchanger (2). 3. The combustion chamber (1) is provided with the series of linear bodies (3).
The overheat prevention device for a combustion device according to claim 1, wherein the overheat prevention device is provided on an outer front surface of a heating portion such as a heat exchanger (2). 4. The combustion chamber (1) is provided with the series of linear bodies (3).
The overheat prevention device for a combustion device according to claim 1, wherein the overheat prevention device is provided on an outer rear surface and both side surfaces of a heating portion such as a heat exchanger (2). 5. The series of linear bodies (3) is connected to a combustion chamber (1),
The overheat prevention device for a combustion device according to claim 1, wherein the overheat prevention device is arranged on the entire outer peripheral surface of a heating part such as a heat exchanger (2). 6. A series of linear bodies (3) on a plate-shaped substrate (18).
2. The overheat prevention device for a combustion device according to claim 1, wherein each part is evenly arranged in an arbitrary shape and printed to form a sheet. 7. A series of linear bodies (3) on a plate-shaped substrate (19).
2. The overheat prevention device for a combustion device according to claim 1, wherein each part is evenly arranged in an arbitrary shape, and the surface thereof is gripped by the thin plate material (20) in a pack shape to form a sheet shape.