JP2000182754A - Electric heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow easy adhesion even to a curved surface so as to improve heat conductivity by arranging a flexible and thermally conductive cover mounted in a part of a heat conductive plate for covering a cord heater. SOLUTION: After a cord heater 1 is installed to a heat conductive plate 2, a cover 3 is placed in a predetermined position on the heat conductive plate 2 on the same side as the installed cord heater 1 while the surface having a thermally fusing covering body of the cover 3 is faced to the heat conductive plate 2, and a part of the heat conductive plate 2 and a part of the cover 3 are thermally pressed for installing the cover 3 to the heat conductive plate 2. In the installation part between the heat conductive plate 2 provided with the cord heater 1 and the cover 3, they are overlapped to each other partially, so that the cord heater 1, the heat conductive plate 2, and the cover 3 can be displaced freely except the installation part when the heat conductive plate 2 is fitted and stuck to a curved surface, and consequently, deformation stress is reduced and the electric heating body 7 can be stuck to a curved surface without undue stress.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heating element mounted on a refrigerator or the like.

[0002]

2. Description of the Related Art A conventional electric heating element of this kind is disclosed in
As disclosed in Japanese Patent Application Laid-Open No. 3-82187, a cord-shaped heating element (cord heater) provided with a heat-fusible coating on the outermost side is a thin metal body having a heat-fusible thin body (heat conduction). Board)
And a thin metal body (cover) arranged in an appropriate shape.

[0003]

Problems to be Solved by the Invention
In the electric heating element disclosed in Japanese Patent No. 2187, the total thickness of the thin metal body and the almost thin metal body is thermally fused at almost all places. When the radius of curvature of the curved surface is small, there is a problem that the thermal conductivity is deteriorated because the curved surface does not completely adhere to the curved surface. There is also a problem that the end of the electric heating element is difficult to follow the curved surface and rises, and the assembling operator is injured at the end. Furthermore, when the total thickness is reduced, the workability of attaching to a curved surface is improved,
There is also a problem that the thermal conductivity becomes inferior, the amount of heat transferred by the heat generated by the electric heating element decreases, and the heating effect of the electric heating element decreases.

[0004]

SUMMARY OF THE INVENTION An electric heating element according to the present invention has solved the above-mentioned problems, and the invention according to claim 1 has a flexible heat conductive plate and a heat conductive plate attached to the heat conductive plate. An electric heating element comprising a cord heater provided with a cover having flexibility and heat conductivity attached to a part of the heat conductive plate so as to cover the cord heater. With this configuration, even when the heat conductive plate and the cover are made to have a thickness (for example, 50 microns) capable of maintaining good thermal conductivity, only the thickness of the heat conductive plate affects the deformation stress when attached to a curved surface. By simply pressing the cover after attaching the heat conductive plate to the heater and the heat conductive plate, the heat generated by the heater can be efficiently transmitted to the heat conductive plate, and the flexibility and flexibility can be maintained. Impossible on curved surfaces An electric heating element with excellent thermal conductivity that can be easily attached is obtained, and there is almost no lifting of the end of the electric heating element when attached to a curved surface, which means that the assembly worker is injured at that end. A heat-free electric heating element is obtained.

According to a second aspect of the present invention, the outer end of the mounting portion of the cover near the outer periphery of the electric heating element is a predetermined distance from the end of the heat conductive plate on the same side as the outer end. With this configuration, the outside of the mounting portion of the cover by a predetermined distance from the outer end is related to a deformation stress required when attaching the heat conductive plate to a curved surface. Since the plate thickness is the plate thickness of only the heat conductive plate, the plate thickness related to the deformation stress is thinner than the position where the cover is attached to the heat conductive plate, so that even if the cover is attached to the curved surface, it can easily follow the curved surface. It is possible to obtain an electric heating element that is stuck and has little residual stress due to deformation, and hardly peels off from the stuck end due to the residual stress.

According to a third aspect of the present invention, the cover is attached to the heat conductive plate near both ends of a wiring area of the cord heater. The cover is attached to the heat conductive plate near both ends of the wiring area of the cord heater, so the cover is not easily turned up from the heat conductive plate when transporting or attaching the electric heating element, and has excellent transportability and workability. An electric heating element is obtained.

According to a fourth aspect of the present invention, the length of the cover covering the cord heater is longer than the length of the cover covering the wiring area of the cord heater as viewed from a direction perpendicular to the heat conducting plate. It is characterized by having a long predetermined length, this configuration, particularly when the electric heating element is wound around a cylindrical surface and attached, the length in the winding direction of the heat conductive plate and the cover is greatly different, Since the length of each of the heat conductive plate and the cover is set to a predetermined length corresponding to the length, even if the heat conductive plate is attached to a curved surface, only the attaching stress of the thickness of the heat conductive plate is applied. Electricity with excellent thermal conductivity that can be stuck, has little residual stress due to deformation, and can be stuck more easily even if it is stuck to both curved surfaces from either side of the cover mounting part Heat body is obtained.

Further, the invention described in claim 5 is characterized in that the mounting portion of the cover is provided at an appropriate position between the cord heaters. Displacement is less likely to occur, the cover is covered with less deviation around each of the cord heaters, and the heat is more uniformly transmitted, so that an electric heating element having better heat conductivity can be obtained.

Further, according to the invention described in claim 6, a predetermined interval is maintained between the heat conductive plate, the cord heater and the cover when the cover is attached.
It is characterized in that a spacer of a member that can be compressed and deformed is provided, and with this configuration, the space between the cover and the heat conductive plate is appropriately maintained at the time of manufacturing processing by the spacer, so that the cover can be connected to the heat conductive plate. It is easy to install in a predetermined length of, the workability is improved in manufacturing the electric heating element,
The cover is supplied in a state where it is less unevenly distributed at each position, and after attaching the electric heating element to the curved surface, by pressing the cover against a heat conductive plate or a code heater, more stable thermal conductivity is obtained, and An electric heating element having excellent heat conductivity can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the electric heating element of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an electric heating element according to the present invention,
FIG. 2 is a cross-sectional view of a main part taken along line AA of the electric heating element shown in FIG.
FIG. 3 is a sectional view of a main part of another embodiment of the electric heating element shown in FIG. 1, and FIG. 4 is an electric heating apparatus in which an outer end of a mounting portion of a cover is within a predetermined distance from an end of a heat conducting plate on the same side. FIG. 5 is a sectional view of a main part of the heating element, and FIG. 5 shows a case where the length of the cover covering the cord heater is a predetermined length longer than the length of the cover covering the wiring area of the cord heater as viewed from a direction perpendicular to the heat conducting plate. FIG. 6 is a cross-sectional view of a main part of the heating element, and FIG. 6 is a cross-sectional view of a main part of the electric heating element when a cover mounting portion is provided at an appropriate position between the cord heaters. FIG. 4 is a cross-sectional view of a main part of the electric heating element when a spacer is provided.

In FIG. 1, reference numeral 1 denotes a cord heater which is a cord-shaped heating element having a heat-fusible coating on the surface, and 2 denotes a material having a heat-conductive coating having a heat-fusible coating on the surface (for example, Aluminum), a flexible, bendable film-shaped (for example, 50 μm thick) heat conductive plate.
Is a film-like cover having substantially the same characteristics as the heat conductive plate 2. Reference numeral 4 denotes a protection tube for electrically and mechanically connecting the conductor of the lead wire 5 and the conductor of the cord heater 1 and then protecting the connection.

After electrically and mechanically connecting the conductor of the lead wire 5 and the conductor of the cord heater 1, the connection portion is covered with a protective tube 4 to form a cord heater assembly 6. The cord heater 1 is mounted on the heat conducting plate 2 by laying it in a predetermined shape on the surface on the side having the heat-fusible coating, and then performing heat pressing or the like in that state. 1 is placed at a predetermined position on the heat conductive plate 2 on the same side as the side on which the cover 1 is attached, with the side of the cover 3 having the heat-fusible coating facing the heat conductive plate 2;
The cover 3 is mounted on the heat conductive plate 2 by hot pressing the heat conductive plate 2 and a part of the cover 3 to constitute the electric heating element 7 of the present invention.

Each of the cord heater 1, the heat conductive plate 2, and the cover 3 is attached not only by placing a heat-fusible coating on the surface but by hot pressing or the like, and applying an adhesive to each surface. Alternatively, a method of attaching by attaching an adhesive tape or the like may be used.

In FIG. 2, the heat conductive plate 2 on which the code heater 1 is mounted and the mounting portion 8 on which the cover 3 is overlapped are partially mounted. 1 and the heat conductive plate 2 and the cover 3 are free to be displaced from each other except for the mounting portion 8, so that the deformation stress is small and the electric heating element 7 can be stuck to the curved surface without difficulty.

Thereafter, when the cover 3 is pressed against the cord heater 1 and the heat conductive plate 2 and deformed to conform to the shapes, the code heater 1 is sandwiched between the heat conductive plate 2 and the cover 3, and the heat generated by the code heater 1 is generated. The heat generated is transferred efficiently to the curved surface. In the cord heater 1, an electric heater is wound around a core material to form a heater assembly 1a, which is covered with a heat-resistant insulator 1b, and thereafter a heat-fusible coating 1c is provided on the outermost side to provide flexibility and flexibility. It has.

The length of the cover 3 is preferably set to a length necessary for covering the cord heater 1 and the heat conductive plate 2 in accordance with the curved surface to which the cover 3 is attached. In addition, a sticking adhesive is applied to the bonding surface of the heat conductive plate 2 opposite to the side on which the cord heater 1 is mounted, and a sheet-like separator that can be easily peeled off is applied on the bonding surface to facilitate transportation and bonding work. It is convenient.

The electric heating element 7 is attached to a curved surface at the vicinity of the mounting portion 8 first, and then from the position to the right in the drawing and is attached along the curved surface. After attaching the heat conductive plate 2 to the curved surface, the cover 3 is attached to the cord heater 1 in the rightward direction in the drawing in order from the mounting portion 8 side.
While being pressed against the heat conductive plate 2 and fixed along the surface shape.

If there is a concern that the cover 3 will come off, it may be placed in an oven and then heated and fused. When the whole is heat-sealed, the connection between the cord heater 1, the heat conducting plate 2, and the cover 3 becomes more reliable, and the heat transfer of the cord heater 1 to the curved surface is further improved.

As described above, even if the heat conductive plate 2 and the cover 3 are made to have a thickness (for example, 50 μm) capable of maintaining good heat conductivity, the heat conductive plate 2 and the cover 3 can maintain flexibility and can be easily and easily attached to a curved surface. An electric heating element having an excellent heat resistance is obtained, and the end of the electric heating element 7 is hardly lifted when the electric heating element 7 is stuck on a curved surface, so that an assembler is not injured at the end. can get.

The electric heating element 7 is wound around an outer surface of a water supply pipe for supplying water to an ice tray of an automatic ice maker of a refrigerator, for example, and is energized to the cord heater 1 to freeze water in the water supply pipe. Helps to prevent pipe clogging.

In FIG. 3, reference numeral 8a denotes a mounting portion of the heat conductive plate 2 and the cover 3 which are located on the inner side of the heat conductive plate 2, and the electric heating element 7a is attached to a curved surface. After the attachment, the heat conductive plate 2 is attached to the curved surface from the attachment portion 8a to the left and right, and then the cover 3 is fixed to the cord heater 1 and the heat conduction plate 2 from the attachment portion 8a along the surface shape while being pressed to the left and right. Will be.

In the case of attaching to the concave surface, if a material having a little spring property or rigidity (for example, stainless steel or an aluminum material having an increased thickness) is used for the heat conducting plate 2, the attaching workability is improved.

As described above, even if the heat conductive plate 2 and the cover 3 are made to have a thickness (for example, 50 μm) capable of maintaining good heat conductivity, the heat conductive plate 2 and the cover 3 can maintain the flexibility and can be stuck to the curved surface easily. An electric heating element is obtained.

In FIG. 4, the outer end 8c of the mounting portion 8b of the cover 3 near the outer periphery of the electric heating element 7b is separated from the end 2a of the heat conductive plate 2 on the same side as the outer end 8c by a predetermined distance (for example, 6 mm). Mm) only within. For this reason, since the plate thickness related to the bonding stress outside the outer end 8c of the attachment portion 8b of the cover 3 by a predetermined distance is only the thickness of the heat conductive plate 2, it can easily follow the curved surface even when it is bonded to the curved surface. In addition, an electric heating element which has a small residual stress after application and is not easily peeled off can be obtained.

Although the outer end 8c of the mounting portion 8b is the end of the cover 3 in this figure, if it is inside from the end of the cover 3, the heat conductive plate 2 from the end of the cover 3 to the outer end 8c Has the same effect as described above, and it is clear that the same effect can be obtained for all the electric heating elements of the present invention.

In FIG. 5, the length of the electric heating element 7c of the cover 3 covering the cord heater 1 is longer than the length of the cover 3 covering the wiring area of the cord heater 1 as viewed in a direction perpendicular to the heat conducting plate 2. A predetermined length (for example, the heat conducting plate 2
When the width (length) of the cover 3 is 35 mm, the width (length) of the cover 3 is 45 mm.

For this reason, for example, the width direction of the heat conductive plate 2 having a width of 35 mm is set so that the cover 3 is attached to the heat conductive plate 2 in the outer circumferential direction of a pipe having an outer diameter of 10 mm.
Then, the cover 3 is pressed against the cord heater 1 or the heat conductive plate 2 so as to conform to the shape thereof, whereby an electric heating element having excellent heat conductivity can be obtained on the pipe.

Since the attachment portion 8d is provided outside near the both ends of the wiring area of the cord heater 1,
Regardless of which side of the mounting portion 8d, the electric heating element 7c is stuck to the curved surface without difficulty. The same effect can be obtained even if the mounting portion 8d is provided near both ends of the wiring area of the cord heater 1.

In FIG. 6, the electric heating element 7d is
Is an electric heating element provided at an appropriate position between the cord heaters 1. For this reason, the cover 3 is arranged with less deviation at each position only by attaching the heat conductive plate 2 to a curved surface. The cover 3 is more uniformly covered around the cord heater 1 by pressing the cord heater 1 and the heat conductive plate 2 to conform to the shape thereof, and an electric heating element having more excellent heat conductivity can be obtained on a curved surface.

In FIG. 7, an electric heating element 7e is a compressible deformable member (for example, carbon fiber) that maintains a predetermined interval when the cover 3 is attached to the space between the heat conductive plate 2, the cord heater 1, and the cover 3. ) Spacer 9
, The cover 3 can be easily attached to the heat conducting plate 2 with a predetermined length, workability in manufacturing the electric heating element 7e is improved, and the cover 3 is Is supplied to a processing place where the electric heating element 7e is attached to a curved surface in a state where the electric heating element 7e is arranged with little deviation at the position of the electric heating element 7e.
After attaching to a curved surface, more stable thermal conductivity can be obtained.
In addition, 8e is a mounting portion of the heat conductive plate 2 and the cover 3.

The spacer 9 is made of a foamed metal (for example, a gas-permeable soft urethane plated with a metal such as aluminum, and then the soft urethane is melted or burned off) and a thin-film honeycomb metal body. A wire scissors (a fibrous metal rolled into a cotton-like shape), a soft resin (for example, butyl rubber), and a soft resin foam (for example, soft urethane) having a low thermal conductivity can be used.

The mounting portions 8, 8a, 8b, 8
In order to further improve the flexibility of the electric heating element, d, 8e, etc. may be narrowed in the width of the electric heating element, or may be a partially attached part instead of a continuous band.

[0034]

According to the first aspect of the present invention, since the electric heating element of the present invention has the above-described structure, it can maintain flexibility and can be stuck to a curved surface without difficulty. An excellent electric heating element can be obtained, and furthermore, there is almost no lifting of the end of the electric heating element when attached to a curved surface, so that an electric heating element without assembling workers being hurt at the end can be obtained. .

According to the second aspect of the present invention, it is possible to obtain an electric heating element which is hardly peeled off from the end where it is stuck even when stuck to a curved surface.

According to the third aspect of the present invention, the cover is hardly turned up from the heat conductive plate when the electric heating element is transported or attached, and an electric heating element excellent in transportability and workability can be obtained. .

According to the fourth aspect of the present invention, it is possible to obtain an electric heating element having excellent thermal conductivity, which can be more easily attached to both the concave and convex curved surfaces from either side of the cover attaching portion. .

Further, according to the invention described in claim 5, the cover is covered with less deviation around each of the cord heaters, the heat is more uniformly transmitted, and the electric heat is more excellent in heat conductivity. The body is obtained.

Further, according to the invention described in claim 6, it is easy to attach the cover to the heat conducting plate with a predetermined length, and the processability in manufacturing the electric heating element is improved. In addition, the cover is supplied in a state where the cover is arranged with less unevenness at each position, and a stable heat conductivity is obtained after the electric heating element is attached to the curved surface, and an electric heating element excellent in heat conductivity is obtained. .

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an electric heating element of the present invention.

FIG. 2 is a cross-sectional view of an essential part taken along line AA of the electric heating element shown in FIG.

FIG. 3 is a sectional view of a main part of another embodiment of the electric heating element shown in FIG. 1;

FIG. 4 is a cross-sectional view of a main part of an electric heating element according to an embodiment of the present invention, in which an outer end of a mounting portion of a cover is within a predetermined distance from an end of a heat conductive plate on the same side; It is.

FIG. 5 is a view showing an embodiment of the electric heating element of the present invention, in which a length of a cover covering a cord heater is longer than a length of a cover covering a wiring area of the cord heater as viewed from a direction perpendicular to a heat conducting plate. It is principal part sectional drawing of the electric heating element which is length.

FIG. 6 is a cross-sectional view of a main part of the electric heating element, showing an embodiment of the electric heating element of the present invention, when a cover attaching portion is provided at an appropriate position between cord heaters.

FIG. 7 is a cross-sectional view of a main part of an electric heating element according to an embodiment of the present invention, in which a spacer is provided between a heat conductive plate, a cord heater, and a cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Code heater 2 Heat conductive plate 3 Cover 8c Outer end 9 Spacer

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taiji Oshiro 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term (reference) 3K092 PP20 QA05 QB26 QB45 VV03

Claims (6)

[Claims] 1. An electric heating element comprising a heat conducting plate having flexibility and a cord heater attached to the heat conducting plate, the electric heating element being attached to a part of the heat conducting plate so as to cover the cord heater. An electric heating element comprising a cover having flexibility and heat conductivity. 2. An outer end of the mounting portion of the cover near an outer periphery of the electric heating element is within a predetermined distance from an end of the heat conducting plate on the same side as the outer end. The electric heating element according to claim 1. 3. The electric heating element according to claim 1, wherein the cover is attached to the heat conduction plate near both ends of a wiring area of the cord heater. 4. The length of the cover covering the cord heater is a predetermined length longer than the length of the cover covering the wiring area of the cord heater as viewed from a direction perpendicular to the heat conducting plate. Claim 1 or Claim 2
Or the electric heating element according to claim 3. 5. The electric heating element according to claim 1, wherein an attachment portion of the cover is provided at an appropriate position between the cord heaters. 6. A compression-deformable member spacer is provided between the heat conduction plate, the cord heater, and the cover, the spacer being maintained at a predetermined distance during the cover mounting process. The electric heating element according to claim 1.