JP2000290641A - Heating element, and heating tool using heating element as heat source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, at a low cost, a heating element which generates reduction reaction heat and is improved in safety on ignition. SOLUTION: This heating element comprises a heat-generating agent 2, a starter 3, and a packaging member 1 for receiving the materials. The packaging member 1 is cylindrically formed from an iron foil as a raw material and receives the main body portion 4 and the heat-generating agent 2. A tapered ignition portion 5 is disposed at one end of the main portion 4. The starter 3 is received in the ignition portion 5, and the opening edge of the ignition portion 5 is bent to close the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a heating element which uses heat released when a metal oxide undergoes a reduction reaction as a heat source,
The present invention relates to a heating device using the heating element.

[0002]

2. Description of the Related Art As a heating agent for such a heating element, a thermite in which aluminum and iron oxide powders are mixed is widely known. JP-B-61-50214 discloses a heating element in which a thermite and a heating igniter for starting a reduction reaction in the thermite are enclosed in a metal case. The igniter is composed of a powder containing barium chromate as a main component, amorphous boron, and aluminum oxide for enhancing fluidity. Ignition to the ignition agent
The operation is performed through a squib leading out of the case, and the inside of the squib coating is filled with a burning agent having the same composition as the igniting agent.

[0003] The fuse is ignited by a match or lighter, etc.
Ignite the igniter in the case. The combustion heat of the igniter induces a reduction reaction of the thermite, and a large amount of heat is released as the reduction reaction proceeds. The wrapping body is composed of an inner container made of iron and an outer container formed of aluminum, brass, or the like having higher thermal conductivity than the inner container. Other than this, JP-A-1-288218 and JP-A-4-7.
In JP 21699, a heating element utilizing heat of reduction or heat of oxidation of a metal can be seen.

[0004]

According to the above-described heating element, which ignites an igniter charged in an inner container through a squib,
Ignition can be performed quickly and reliably only by the heat of a match or lighter, but until the squib and igniter are completely burned, high-temperature flames and sparks erupt from the end of the squib and the end of the inner container. Therefore, there is a danger of burns and fire, and there is a problem in safety.

[0005] During the production of the heating element, the elongated cylindrical inner container is pressurized and filled with thermit, then the igniter is charged, the squib and the plug are charged, and the end of the inner container is squeezed. Close. Finally, the inner container is inserted into the outer container to complete the heating element. As described above, the conventional heating element requires a lot of labor in manufacturing and has a large number of components such as a double case, so that it is unavoidable that the cost increases. Therefore, it is not suitable for disposable use.

SUMMARY OF THE INVENTION An object of the present invention is to reliably prevent a flame or a spark from escaping outside the envelope until the starter finishes burning, so that the user may be concerned about a burn or a fire. An object of the present invention is to provide a heating element that can be used without worry. Another object of the present invention is to provide a heating element capable of safely igniting the starter through the peripheral wall of the envelope even though the starter is enclosed in the envelope together with the exothermic agent. Still another object of the present invention is to provide a heating element which can be manufactured easily at a low cost as a whole and which is easy to process by simplifying the structure and form of a wrapping body which accommodates a starter and a heating agent. It is in. Another object of the present invention is to provide a heating device using such a heating element.

[0007]

The heating element of the present invention comprises:
As shown in FIG. 1, a heating agent 2 composed of a metal oxide, a reducing metal that combines with oxygen contained in the metal oxide to cause a reduction reaction, and a starter that induces a reduction reaction of the heating agent 2 by heat of combustion 3, exothermic agent 2 and starter 3
And a wrapping body 1 that accommodates the The wrapping body 1 is formed in a cylindrical shape from a thin metal sheet that withstands the heat of the reduction reaction of the exothermic agent 2, and has a main body 4 that accommodates the exothermic agent 2 and a starter 3 that is provided at one end of the main body 4 And an ignition section 5 for accommodating the same. As shown in FIG. 3, the opening edge of the ignition portion 5 is closed in a dot or line shape, and the ignition portion 5 is formed in a tapered shape toward the tip.

As shown in FIG. 6, the ignition portion 5 can be formed in a tongue shape by squeezing the main body portion 4 into a tapered and flat shape. Further, as shown in FIG. 4, the ignition portion 5 of another envelope 1 can be formed in a sharpened shape by joining its opening edges linearly. As shown in FIG. 7, the ignition portion 5 of another wrapping body 1 can be formed in a tapered shape by reducing the diameter while twisting and deforming one end of the main body 4 in one direction. The envelope 1 can be formed of iron foil.

As shown in FIGS. 8 and 9, the heating device of the present invention includes a grip 20, a housing 21 provided at one end of the grip 20, a spatula-shaped heat transfer portion 22 projecting from the housing 21, And a heating element H to be loaded in the storage section 21. The heating element H is as described above, and the heat is transmitted to the processing target via the heat transfer section 22.

[0010]

The wrapping body 1 is formed into a tubular shape by using a thin metal sheet that is easy to process, such as an iron foil or an aluminum foil.
Can be sufficiently reduced. Since the ignition portion 5 is provided integrally with the main body portion 4 and the opening edge thereof is closed in a dotted or linear manner, the flame or sparks may squirt out of the ignition portion 5 while the starter 3 is burning. Absent. By the way, the starter 3 can be ignited by heating the peripheral wall of the ignition portion 5 with a lighter or a match flame until the ignition point is reached. In order to further reduce the time required for the ignition, the entire ignition section 5 is tapered. That is, by heating the tapered tip portion, the heat can be concentrated and the ignition of the starter 3 can be facilitated. The fact that the envelope 1 is made of a thin metal sheet also helps to facilitate ignition of the starter 3.

The wrapping body 1 is formed into a tubular shape or a bag shape by bending and joining edges of thin metal sheets or by welding. Further, the opening edge of the ignition portion 5 is crushed, welded, or torsionally deformed to close the ignition portion side. Similarly, the end on the side of the main body 4 is sealed by narrowing the peripheral wall. As described above, since the wrapping body 1 is partially sealed by plastic deformation or welding, the structure and form can be simplified as compared with the conventional case.

A heating device using the heating element H as a heat source as described above causes the heating element H to generate heat and transfers the heat to the heat transfer section 22.
To the processing target via. For example, when removing frost adhering to a front window of an automobile, the heat of a heating element is
To the frost (processing target) via the heat transfer unit 22, and can be used to remove the frost by the scraping action of the heat transfer unit 22 and the melting action of the frost by heat.

The heating element in which the wrapping body 1 is formed of a thin metal sheet requires less manufacturing cost. Therefore, it is not necessary to worry about the consumption cost of the heating element, and the heater can be easily used.

[0014]

1 and 3 show an embodiment of a heating element according to the present invention. The heating element H is a round bar-shaped wrapping body 1.
And a heating agent 2 filled in the envelope 1 and a starter 3.

The exothermic agent 2 is formed from a mixture of a metal oxide, a reducing metal that combines with oxygen contained in the metal oxide to cause a reduction reaction, and a small amount of an auxiliary composition added as needed. I do. Metal oxides include iron oxide and copper oxide, and one or two of these are mixed and powdered. Aluminum or magnesium is suitable as the reducing metal, which is also powdered. In this example, an exothermic agent 2 was prepared by mixing iron oxide and aluminum.

The starter 3 was made of barium chromate as a main component, to which aluminum oxide and amorphous boron were added.

The envelope 1 is formed from a thin metal sheet typified by an iron foil or an aluminum foil. In order to withstand the heat of the reduction reaction and maintain the cylindrical state, the thickness of the iron foil is preferably about 25 to 100 μm, and the thickness of the aluminum foil is preferably 50 μm or more. More specifically, the opposite sides of the metal sheet cut into a square shape are bent and joined together or laser welded to form a cylindrical body. Next, after cutting one end of the cylindrical body into a trapezoidal shape, the opening edges (right and left oblique sides and upper side) are joined and bent,
A tapered ignition portion 5 is formed. Reference numeral 6 indicates this bent portion.

The obtained cylinder is held upright with the ignition portion 5 side down, and the starter 3 is filled. Specifically, the wet starter 3 is pressurized and filled into the ignition section 5 and then dried. The filling amount of the starter 3 is
Is set to be equal to or slightly more than the internal capacity of Next, the heat generating agent 2 is pressurized and filled into the main body 4 having a circular cross section, and the upper end of the opening of the cylindrical body is sealed and closed by twisting. If necessary, as shown in FIG. 3, the outer surface of the ignition portion 5 is covered with a foldable flammable film 7 to seal the folded portion 6 to prevent moisture from entering.

The shape of the ignition section 5 can be changed as shown in FIGS. The ignition part 5 of FIG. 4 was formed by cutting one end of the cylindrical body obliquely, and then joining and bending the cut edges straight to form a sharpened shape. The ignition portion 5 of FIG. 5 was formed in a tongue shape by cutting one end of a cylindrical body into an inverted U shape, joining the opening edges thereof, and welding. The ignition section 5 of FIG. 6 crushes one end of the cylindrical body flat,
The end was bent and formed. The ignition portion 5 of FIG. 7 was formed in a tapered shape by reducing the diameter while twisting and deforming one end of the cylindrical body in one direction. Only in this embodiment, the ignition unit 5
Will be closed in a dot-like manner.

FIGS. 8 and 9 show an embodiment of a heating device using the above-mentioned heating element H as a heat source. This heating device is used to remove frost and water attached to the front window of the car.
An accommodating portion 21 for accommodating the heating element H is provided,
From 1, a spatula-shaped heat transfer portion 22 is protruded.

In FIG. 9, the accommodating portion 21 is formed in a double cylindrical shape by an inner cylinder 23 and an outer cylinder 24, and an entrance 25 of the inner cylinder 23 can be closed by a lid 26 which can swing and open. There is a space between the inner cylinder 23 and the outer cylinder 24, and the air in this space exerts a heat insulating effect to prevent the outer cylinder 24 from becoming hot. If necessary, the space can be filled with a heat insulating material. The heat transfer portion 22 is formed of a steel plate or a stainless steel plate having a thickness of several mm, and one end of the heat transfer portion 22 is held by the outer tube 24 and is metal-bonded to the inner tube 23. A heat insulating material may be interposed between the heat transfer section 22 and the outer cylinder 24 holding and holding the base end thereof.

At the time of use, the lid 26 is opened, the rod-shaped heating element H is loaded into the inner cylinder 23, and the ignition portion 5 is connected to the entrance 25.
Face. The ignition part 5 is heated by the flame of the lighter to ignite the starter 3. When the starter 3 ignites, the combustion gas leaks out of the bent portion 6, and the foil wall facing the ignition portion glows red. After confirming this red heat state, the lid 26 is closed and fixed. The heat of combustion of the starter 3 induces a reduction reaction of the exothermic agent 2 adjacent to the starter 3, and thereafter the reduction reaction proceeds in a direction away from the ignition portion 5 to generate reaction heat. This reaction heat is transmitted to the heat transfer section 22 to heat the entire heat transfer section 22.

As described above, the frost is scraped off while the heat transfer section 22 is heated, so that the frost is melted and further removed by the heat transfer section 22. Therefore, frost and ice can be effectively removed without using hot water. Note that the heating element H continues to generate heat for about one minute from the time when the ignition part 5 is ignited. Since the exothermic agent 2 after the reaction is iron and aluminum oxide, it can be reused as a metal material.

The heating element H can also be used as a heat source when boiling hot water outdoors. For example, as shown in FIG. 10, a vertically long cylindrical case 28 having an open upper surface and capable of accommodating a heating element H therein is hung on a container 29 such as a cup or a pan, and most of the case 28 is underwater stored in the container 29. The heating element H is ignited in a state of being immersed in the heating element H. Boiling water can also be obtained by using several heating elements H depending on the amount of water.

The heating element H can also be used as a heat source for heat sterilization of soil. In this case, the envelope 1 is formed in an envelope shape so that the heating area becomes large. The ignition portions 5 may be provided at a plurality of positions at one corner or a diagonal corner of the envelope 1.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a heating element.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an enlarged sectional view of an ignition section.

FIG. 4 is a perspective view showing another embodiment of the heating element.

FIG. 5 is a perspective view showing another embodiment of the heating element.

FIG. 6 is a perspective view showing another embodiment of the heating element.

FIG. 7 is a perspective view showing another embodiment of the heating element.

FIG. 8 is a front view of the entire heating device.

FIG. 9 is a sectional view taken along line BB in FIG. 8;

FIG. 10 is a longitudinal sectional view showing another application example of the heating element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Envelope 2 Heating agent 3 Starter 4 Main part 5 Ignition part 6 Bending part 7 Flammable film 20 Grip 21 Housing part 22 Heat transfer part 23 Inner cylinder 24 Outer cylinder 25 Doorway 26 Cover H Heating element

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiro Kunihisa 8-50 Osumihiraya, Kyotanabe-shi, Kyoto (72) Inventor Noji 2 1130-2 Kawaguchi, Kashiba-shi, Nara

Claims (7)

[Claims] An exothermic agent comprising a metal oxide, a reducing metal which combines with oxygen contained in the metal oxide to cause a reduction reaction, and a starter which induces a reduction reaction of the exothermic agent 2 by heat of combustion. 3 and a wrapping body 1 containing a heating agent 2 and a starter 3. The wrapping body 1 is formed in a cylindrical shape with a thin metal sheet that withstands the heat of reduction reaction of the heating agent 2, 2 and an ignition part 5 provided at one end of the main part 4 and accommodating the starter 3. The opening edge of the ignition part 5 is closed in a dotted or linear manner. hand,
A heating element characterized in that the ignition part (5) is tapered toward the tip. 2. The heating element according to claim 1, wherein the ignition portion is formed in a tongue shape by crushing the main body portion into a tapered and flat shape. 3. The heating element according to claim 1, wherein the igniting portion is formed so as to be sharpened by joining its opening edges linearly. 4. The heating element according to claim 1, wherein the ignition portion is formed such that one end portion of the main body portion is reduced in diameter while being torsionally deformed in one direction and is tapered. 5. The heating element according to claim 1, wherein the wrapping body 1 is formed of iron foil. 6. A grip 20, a housing 21 provided at one end of the grip 20, a spatula-shaped heat transfer portion 22 protruding from the housing 21, and a heating element H loaded in the housing 21. The heating element H is composed of a metal oxide and a heating agent 2 composed of a reducing metal that combines with oxygen contained in the metal oxide to cause a reduction reaction, and induces a reduction reaction of the heating agent 2 by heat of combustion. A heating device comprising a starter 3, a wrapping body 1 containing the exothermic agent 2 and the starter 3, wherein the heat of the heating element H is transmitted to the processing object via the heat transfer section 22. 7. The body 1 of the heating element H is formed of a thin metal sheet which is entirely resistant to the heat of the reduction reaction of the exothermic agent 2 and is formed in a tubular shape. And an ignition section 5 provided at one end of the ignition section 4 for accommodating the starter 3. An opening edge of the ignition section 5 is closed in a dotted or linear manner,
The heating device according to claim 6, wherein the ignition portion (5) is tapered toward the tip.