JPH09180868A - Honeycomb surface heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface heating element which has flexibility and whose heating area is variable by forming a honeycomb structure body of tapes of electric resistant metal. SOLUTION: A honeycomb structure body of a surface heating element 10 is joined so as to be extensible-contractible in the Y axis direction by plural metallic tapes having a fixed width and so that spaces 12 are formed in a honeycomb shape. Fe, Ni, Cr or alloy of these or the like are cited as electric resistant metal to be used as the metallic tapes. Therefore, installation in which the area of the honeycomb structure body corresponds to an installing place by a configurational change is possible. Since extension-contraction in the Y axis direction is possible, when it is completely contracted, since it can be folded up, it is convenient for carrying and storage at unused time. Gas passing through the spaces 12 of the honeycomb structure body is efficiently heated by radiation heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar heating element for utilizing electric energy as heat energy, and relates to a honeycomb type surface heating element useful for utilizing heat in a heater, a drier, a heating structure panel and the like. is there.

[0002]

2. Description of the Related Art A conventional surface heating element is one in which an electrically conductive conductor is meandered or printed on an insulating substrate, or is printed, or a predetermined amount of carbon black or electrically resistant metal is added to rubber plastic. However, it is dispersed and formed into a sheet, mixed with electric resistance carbon fiber or metal fiber itself or an insulating fiber, or dispersed in rubber or plastic into a sheet, or these electric A mixed paper and the like in which resistant fibers are added to a paper-making material to make a mixed paper are known. Further, there is also known a ceramic surface heating element which is made semiconductive by mixing semiconductive carbon black, metal particles, fibers and the like into ceramic.

[0003]

In the above-mentioned prior art, the heating element based on a hard material such as ceramics is a semi-conductive material in which conductive carbon black, metal particles, fibers or the like are mixed in the ceramics. It is known that the molded product is molded, but the molded product is not flexible, and it has been necessary to manufacture a molded product having a structure and size according to the setting location. or,
It is known that rubber, plastic, paper, etc. are mixed with electrically conductive carbon black, metal particles, electrically conductive fibers, etc., to make them semi-conductive, but due to their flexibility, snow melting It is widely used for floor heating and the like, but when heating a fluid such as gas, it is generally wound around a pipe and energized for heating. In this case, it is suitable for heating using a long pipe in view of the relationship between the diameter of the pipe and the flow velocity of the fluid, but the one including the pipe cannot be used as the surface heating element.

[0004]

SUMMARY OF THE INVENTION The present invention solves the problems of the prior art as described above, and provides a surface heating element that is flexible and has a variable heating area. A honeycomb structure is formed of a flexible material, and the flexible material is composed of X-axis and Y-axis directions.
It is designed so that it can be expanded and contracted in the Y-axis direction. That is, the honeycomb type surface heating element of the present invention is formed of a heating element made of an electrically resistive metal tape, or a heating element made of a semiconductive coating is formed on the surface of the metal tape via an insulating coating. Alternatively, a heating element made of a semiconductive coating is formed on the surface of the insulating tape, or a heating element made of a printed circuit is formed on the surface of the insulating tape. Thereby, the gas flowing through the voids of the honeycomb structure is heated by radiant heat, and the area of the honeycomb structure can be mounted corresponding to the mounting location due to the change in shape,
Depending on the situation, it can be applied in a fan-like shape and its application is widened.In addition, even if the thickness is thin, there are many honeycomb-shaped structures with the same thickness, which has the advantage of withstanding the impact from the surface direction. It can also be used for indoor heating and roof snow melting.

As the electric resistance metal used as the metal tape constituting the present invention, Fe, Ni, Cr or alloys thereof, stainless steel, Al-Zn alloy, etc. are used. The semi-conductive coating is made of aluminum oxide, copper oxide or the like and has a volume resistivity of 10 ⁴ to 10 ⁷ Ωc.
m can be used. These materials are dispersed in a binder resin and applied on the surface of a metal tape or an insulating tape. Epoxy resin, polyester resin, polyimide resin, polyurethane resin or the like can be used as the binder resin for forming the semiconductive coating film. Further, as the material for forming the semi-conductive coating, in the case of a conductive compound, for example, rubber, plastic or the like in which conductive carbon black is blended in an amount of 10 to 30 wt% is used.
In addition, stainless steel fibers and carbon fibers may be appropriately mixed in rubber / plastic, nickel plated sericite C
A plastic coating or the like having a filler obtained by depositing a Ni-P alloy coating is used for the semiconductive coating.

As the insulating tape, various rubbers and plastics are used. In this case, a flexible tape having heat resistance to some extent is preferable. For example, a film of natural rubber, synthetic rubber, polyimide, polyester, polyurethane or the like is used. Further, silver or nickel-plated copper, which is difficult to oxidize, can be used as a lead portion for energizing by printing or pasting a foil.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A specific example of the present invention will be described with reference to the drawings. FIG. 1 (a) shows an overall structure of a honeycomb type surface heating element 10 using a base tape made of a metal tape or an insulating tape. FIG. 1 is a front view showing the structure, in which 11 is a joint portion, 1
2 is a hole (regular hexagon in the figure), which can be expanded or contracted in the Y-axis direction, and if it is completely contracted it will be folded like the state of (b). When not in use, it is easy to carry and store, and when in use, it is possible to form an arbitrary void portion such as a honeycomb structure or a half-open honeycomb structure depending on the extent of expansion. The gas flowing through the holes can be heated by radiant heat. (C) is the side surface in the folded state, and the thickness is indicated by t.

FIG. 2 is a partial front view of another embodiment, in which the joint portion 11 is shorter than that in FIG.
Are formed. The honeycomb type of the present invention includes various modifications as described above. Also, although not shown,
When expanded, the honeycomb surface heating element of the present invention can be formed into a fan shape by opening the upper surface large and the lower surface small. Further, it is also possible to roll up a uniformly expanded product to form a cylindrical shape.

FIG. 3 is a cross-sectional view showing the structure of a metal tape according to the first aspect of the present invention, which is composed of a metal tape 21a made entirely of stainless steel or a resistant nickel-chromium alloy, iron-chromium alloy or the like. It produces heat when energized due to its electrical resistance depending on the type of metal. The joining point for forming the honeycomb structure is formed by welding.

FIG. 4 shows the structure of a composite tape according to the second aspect of the present invention, in which a plastic coating of polyester resin, polyimide resin, polyurethane resin, epoxy resin or the like is attached to both surfaces of the metal tape 21a, or these An insulating coating 21d composed of a resin baking coating is provided, and a rubber or plastic paint mixed with carbon black, resistive metal powder, resistive fibers or the like is applied thereon to form the semiconductive coating 22. A lead (not shown) for energizing is continuously provided at a required position such that the folded end is an electrode end. Since electricity flows in inverse proportion to resistance, the metal tape cannot be used directly as a lead for the semi-conductive film.Therefore, an insulating film is provided on the surface of the metal tape as described above, and a semi-conductive film is provided on it. For this, it is necessary to separately provide a lead for energization. When the insulating coating is composed of a resin-applied and baked coating as described above, it has good electrical insulation properties and is thinner and has better mechanical properties and heat resistance than the case where the insulating coating is formed by sticking a plastic film. An excellent insulating film is obtained. The joining point for forming the honeycomb structure is formed by adhesion or fusion depending on the type of material.

FIG. 5 shows the structure of a composite tape according to claim 3 of the present invention, in which a semiconductive film 22 is formed on both surfaces of an insulating tape 21b such as rubber, plastic or paper. Illustration of the lead portion is omitted. FIG. 6 corresponds to claim 4 of the present invention. In the figure, an insulating film 21c is laminated on both sides of a metal tape 21a with an insulating coating film of plastic, and a printed circuit 23 made of a resistive metal is printed or foil-bonded on the surface. It is provided by attachment. The print in this case is formed by coating a metal thin film, but as another method, a discharge breakdown recording paper in which metal is vapor-deposited on a conductive support is used, and a metal circuit is formed by discharge breakdown. You may form. Further, this is electrically connected by a lead circuit such as a lead conductor (for example, platinum), and is connected to terminal portions provided at both ends of the honeycomb (not shown).

In the surface heating element of the second, third, and fourth aspects, at least the conductive or insulating coating film is provided at the crossing portion of the honeycomb, and the coating is bonded by adhesion. Further, in carrying out the present invention, the metal tape of claim 1 or the composite tape of claims 2 to 3 is used as a corrugated core 25 supported by a base material 24 as shown in FIG. You may form in. Further, the heating element constituting the present invention does not necessarily have to be formed over the entire width t of the side surface of the honeycomb structure shown in FIG.
For example, on the side surface 26 of FIG. 8, the heating element 28 may be laminated in a stripe shape within the width of the thickness t by printing or pasting, and the margin portion 27 may be provided. As a result, the honeycomb type surface heating element of the present invention has a higher electric resistance than the heating element having a narrow width, so that the thickness t
A more efficient surface heating element can be expected even in applications where the width is wide. In addition, in this case, the heating element may be formed in a curved meandering shape instead of the straight stripe, and the number of the heating elements may be one in parallel instead of one.

[0013]

【Example】

Example 1 As a metal tape, length 120 m, thickness 50 μm, width 5
1 mm of an aminium-nickel alloy is used, and the honeycomb type surface heating element of the present invention is formed by bending it as shown in FIG. 1 and using an insulating adhesive between both ends and adjacent tapes at regular intervals. Obtained. In this case, one section of the honeycomb forms a regular hexagon having a side length of 5 mm, and the overall size of the honeycomb type surface heating element is 40 cm × 90 cm in length and width.
It became cm.

Example 2 A honeycomb-type surface heating of the present invention was carried out in the same manner as in Example 1 above by providing a coating and baking layer of an epoxy resin coating containing 30% of carbon black on the surface of an alumite tape having a thickness of 30 μm and a width of 5 mm. Got the body

Example 3 A coating layer of a polyester resin coating containing 30% of carbon black was provided on the surface of a polyester tape having a thickness of 30 μm and a width of 5 mm. At that time, the coating thickness on the surface is 10
A μm silver paint was applied in the longitudinal direction of the tape to form a lead portion. As a result, the honeycomb type surface heating element of the present invention was obtained by bending as shown in FIG. 2 and spot welding between both ends and adjacent tapes at regular intervals.

Example 4 On a surface of a polyester tape having a thickness of 30 μm and a width of 5 mm, a printed circuit for surface heating of copper oxide is provided on a non-contact portion, and a print lead portion of silver paint is provided on a portion connected to the printed circuit. Only the print lead portion was made to be a fusion-bonded joint portion having a honeycomb structure. If necessary, an insulating coating film was provided on the surface thereof and folded back and joined according to Example 3 to obtain a honeycomb type surface heating element of the present invention.

In carrying out the present invention, when the metal tape material of claim 1 is Al or Al-Zn alloy, the electric resistance can be 10 to 20 Ω / □, and in the case of claims 2 and 3, As the semiconductive material of (1), carbon black mixed with rubber or plastic can be manufactured with an electric resistance of 20 to 500Ω.
Although the present invention has various structures as described above, various electric resistances can be obtained by selecting the material, and the honeycomb shape and the size of the honeycomb pores can be changed by changing the bonding points. You can make something different.

In order to use the surface heating element obtained according to claim 2 at an AC voltage of 100 V, for example, 5 Amp, 20 Ω
The resistance material of Example 1 was energized and a surface temperature of 42 ° C. was obtained after 1 minute. At this time, the room temperature is 25 ° C. (the width of the tape is 5 cm and the length is 7 cm). Further, since the honeycomb type surface heating element according to the present invention is flexible, the honeycomb type surface heating element can be unfolded and rolled into a cylindrical shape. In addition, various products are formed by changing the area of the holes and the semiconductive region, so that a product having a temperature gradient can be obtained.

[0019]

EFFECTS OF THE INVENTION According to the present invention, a honeycomb structure having an arbitrary spread and mesh size can be obtained, and since this honeycomb structure is squeezed when not in use, it does not take up space.
When used, the target object to be attached can be used even if it has a curved or rectangular or circular shape, and can efficiently heat the gas passing through the honeycomb structure. If a metal plate is put on the surface of the plate, the plate is heated, so that it can be used for floor heating, wall heating, roof mud and snow. In addition to the conventional mere surface heating, it can also be heated with structural strength,
Various things are conceivable such as application to the application of heating the fluid by using the holes to heat it and setting the heating temperature to about 200 ° C so as to prevent hospital infection which has become a problem recently. . In addition, it can be used as a sensor-enabled training target for detecting infrared rays attached to the tip of a missile.

[Brief description of the drawings]

FIG. 1A is a front view of an example of a honeycomb structure of the present invention when expanded. (B) is the front surface when folded. (C) is a side view.

FIG. 2 is a front view of another embodiment of the present invention when expanded.

FIG. 3 is a sectional view of a tape according to an embodiment of the present invention.

FIG. 4 is a sectional view of a tape according to an embodiment of the present invention.

FIG. 5 is a sectional view of a tape according to an embodiment of the present invention.

FIG. 6 is a sectional view of a tape according to an embodiment of the present invention.

FIG. 7 shows another embodiment of the present invention having a corrugated structure.

FIG. 8 is a view showing another embodiment of the present invention in which the heating element is formed in a stripe shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Surface heating element 11 Joining part 12 Void part 21a Metal tape 21b Insulating tape 21 Plastic insulating coating 21d Insulating coating 22 Semi-conductive coating 23 Printed circuit made of resistive metal 24 Base material 25 Center core 26 Side surface 27 Blank area 28 Striped heating element t Thickness

Claims (4)

[Claims] 1. A honeycomb-type structure in which a plurality of metal tapes having a constant width are joined to form a honeycomb-shaped cavity so as to be expandable / contractible in the Y-axis direction. A honeycomb type surface heating element formed by a heating element made of a resistive metal. 2. A composite tape in which a heating element composed of an insulating coating and a semiconductive coating is provided on the surface of a metal tape having a constant width, and a hollow is formed in a honeycomb shape so as to be expandable and contractable in the Y-axis direction. A honeycomb-type surface heating element, which is a honeycomb-type structure joined as described above, wherein the semi-conductive coating film is electrically connected entirely by a conducting lead made of a conductive metal. 3. A composite tape having a heating element made of a semiconductive coating on the surface of an insulating tape having a constant width,
A honeycomb-type structure that is joined so as to form a honeycomb-shaped cavity so that it can be expanded and contracted in the Y-axis direction, and the semi-conductive coating film is electrically connected by conductive leads entirely by a conductive metal. Honeycomb type surface heating element characterized in that 4. A honeycomb type structure, which is joined by an insulating tape having a certain width, at least the surface of which is insulative, so that a honeycomb-shaped cavity is formed so as to be expandable / contractible in the Y-axis direction. A honeycomb-type surface heating element, characterized in that a heating element composed of a printed circuit is provided on a surface of the honeycomb-shaped cavity, and these heating circuits are electrically connected by a printed lead conductor.