JP2001217058A - Linear heater element and its connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear heater element with enough flexibility, suppleness, chemical resistance and corrosion resistance, which can safely and easily generate heat. SOLUTION: A carbon fiber bundle 2 contained in a flexible resin tube 1 is inserted into a pipe shaped terminal 3, fixed by riveting, pressing or the like from the outside, with the peripheral fixed with a heat shrinkable tube 4 or by resin molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible linear heating element and its connection structure.

[0002]

2. Description of the Related Art Conventionally, a linear heating element includes a metal wire such as a nichrome wire using a metal resistor, a carbon coated fiber using a coating resistor, and a mixture of a carbon powder and a phenol resin using a solid resistor. Formed into a conductive wire. However, the metal resistance is inferior in chemical resistance and corrosion resistance, has a short life, and has a limited use. Further, those using a coating resistance or a solid resistance are inferior in flexibility and flexibility, and have been difficult to provide along a curved surface.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has sufficient flexibility, flexibility, chemical resistance and corrosion resistance, and can generate heat safely and easily. It is an object of the present invention to provide a linear heating element that can be used.

[0004]

SUMMARY OF THE INVENTION The present inventors have found that carbon fibers having flexibility, flexibility, chemical resistance and corrosion resistance can be used as a linear heating element depending on the temperature range in which heat is generated. I found it. However, carbon fibers have a small elongation of 0.3 to 2% due to tension, so there is a problem in attaching an electrode terminal thereto.

Therefore, the present inventors attached a metal terminal by gently inserting a carbon fiber bundle into an insulating and heat-resistant flexible resin tube, and tightened or pressed from the outside of the terminal. Finding what to fix,
Furthermore, in order to prevent the carbon fiber from being broken near the place fixed to the pipe-shaped terminal, it is sufficient to protect the periphery of the pipe-shaped terminal by using a heat-shrinkable tube or by resin molding. Heading, the present invention has been completed.

That is, in the linear heating element of the present invention, the carbon fiber bundle accommodated in the flexible resin tube is inserted into the pipe-shaped terminal, and is fixed from the outside of the pipe-shaped terminal by tightening or pressing. Characterized in that the peripheral part is fixed by using a heat-shrinkable tube or by resin molding, and the carbon fiber bundle is preferably a collection of 1,000 to 1,000,000 fibers having a diameter of 5 to 8 μm. .

In the connection structure for a linear heating element according to the present invention, a carbon fiber bundle accommodated in a flexible resin tube is inserted into one end of a pipe-shaped terminal, and a power supply lead is connected from the other end of the pipe-shaped terminal. Or, insert the electrode terminal attached to the power supply lead,
The invention is characterized in that the pipe-shaped terminal is fixed to the pipe-shaped terminal from outside and fixed by a press or the like, and the pipe-shaped terminal is connected to a power supply conductor. Further, a heat-shrinkable tube or resin molding may be used so as to enclose the connection between the pipe-shaped terminal and the power supply conductor.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The linear heating element of the present invention has the above-mentioned structure, and gently inserts a carbon fiber bundle into a flexible resin tube and puts it into the tube. It is characterized by being fastened from the outside or fixed by a press or the like, and uses carbon fibers having a diameter of 5 to 8 μm. At this time, if the diameter is less than 5 μm, it is weak against tension, and if it exceeds 8 μm, it is weak against bending. The number of carbon fiber bundles is desirably one in which 1,000 to 1,000,000 bundles are collected. When the number is less than 1,000, the calorific value is too small, and when it exceeds 1,000,000, the calorific value becomes too large, which is not preferable.

The flexible resin tube 1 is made of heat-resistant and weather-resistant silicone resin, fluorine resin, EPDM rubber,
CR rubber or the like can be used. The carbon fiber bundle 2
For example, organic fibers such as rayon and polyacrylonitrile, or fibers obtained by spinning the produced petroleum pitch are used as raw fibers, and the raw fibers are heat-treated in an inert gas atmosphere and carbonized. Also, a pipe-shaped terminal 3
For example, a metal pipe made of a metal such as copper or aluminum, or an alloy thereof is used.

[0010]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. (Embodiment 1) In a linear heating element of the present invention, as shown in FIG. 1, a carbon fiber bundle 2 is loosely accommodated in a flexible resin tube 1, and an end of the carbon fiber bundle 2 is a pipe-shaped terminal. 3 and is fastened from the outside or fixed by a press or the like. Further, the connection between the carbon fiber bundle 2 and the pipe-shaped terminal 3 is covered and protected by a heat-shrinkable tube 4 so as to enclose this portion.

(Embodiment 2) A carbon fiber bundle 2 contained in a flexible resin tube 1 is inserted from one end of a pipe-shaped terminal 3, and the other end of the pipe-shaped terminal 3 is connected to a power supply conductor 5. The bare wire 6 protruding from the covering portion is inserted and fixed from the outside of the pipe-shaped terminal 3 by tightening or pressing to connect the pipe-shaped terminal 3 and the power supply conductor 5 (see FIG. 2). This connection is fixed using a heat-shrinkable tube 7,
By further enclosing the entire connecting portion with the heat-shrinkable tube 8 from above, it is more securely fixed (see FIG. 3). In the present embodiment, the pipe-shaped terminal 3
The bare wire 6 of the power supply conductor 5 was inserted and connected. An electrode terminal was attached to an end of the bare wire 6 in advance, and the electrode terminal portion was inserted into the pipe-shaped terminal 3 and connected. Is also good.

(Embodiment 3) A metal pipe 10 is arranged for attaching a linear heating element 9 to a portion to be heated, and a heat radiating panel 11 is arranged between the metal pipes 10 in a metal frame. The linear heating element 9 obtained in Example 1 is incorporated in a metal pipe 10 and can be used as a panel heater (see FIG. 4). This panel heater can be installed on various curved surfaces if a desired curved surface is provided on a metal frame.

[0013]

The wire heating element of the present invention is an electrode terminal with less cutting of carbon fibers by passing a carbon fiber bundle through a pipe-like terminal and fastening it from the outside by tightening or by pressing with a press or the like. Can be. In addition, by gently placing the carbon fiber bundle in the flexible resin tube, it is possible to obtain a linear heating element that is strong in tension, and has sufficient flexibility and
It has flexibility, chemical resistance and corrosion resistance and can generate heat safely and easily. Further, by adopting the above-mentioned connection structure, a panel heater which is securely connected and has a freely curved surface can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a linear heating element of the present invention.

FIG. 2 is a schematic sectional view illustrating a connection structure of a linear heating element of the present invention.

FIG. 3 is a schematic sectional view showing a connection structure of a linear heating element of the present invention.

FIG. 4 is a schematic plan view showing a panel heater assembled using the linear heating element of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flexible resin tube 2 ... Carbon fiber bundle 3 ... Pipe-shaped terminal 4 ... Heat-shrinkable tube 5 ... Power supply conductor 6 ... Bare wire 7 ... Heat-shrinkable tube 8 ... Heat-shrinkable tube 9 ... Linear heating element 10... Metal pipe 11.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Seiji Fukuda 1-3-34 Kikusui, Shiroishi-ku, Sapporo City Inside Max Comfort Co., Ltd. (72) Inventor Mutsuro Iwakoshi 11 Kita-ku, Kita-ku, Sapporo 11 1-chome F-term in Hokkaido R & D Center (reference) 3K092 PP20 QA03 QB16 QB26 QC18 QC59 QC65 RE02 SS24 TT08 TT13 VV09 VV25 VV31

Claims (4)

[Claims] 1. A carbon fiber bundle accommodated in a flexible resin tube is inserted into a pipe-like terminal, fixed from the outside of the pipe-like terminal by fastening or pressing or the like, and using a heat-shrinkable tube for a peripheral portion. A linear heating element characterized in that the linear heating element is fixed by resin molding. 2. The carbon fiber bundle is formed by assembling 1,000 to 1,000,000 fibers having a diameter of 5 to 8 μm.
4. The linear heating element according to item 1. 3. A carbon fiber bundle accommodated in a flexible resin tube is inserted into one end of a pipe-like terminal, and a power supply lead or an electrode attached to the power supply lead is connected from the other end of the pipe-like terminal. A connection structure for a linear heating element, wherein a terminal is inserted and fixed from the outside of the pipe-shaped terminal by tightening or pressing or the like, and the pipe-shaped terminal is connected to a power supply conductor. 4. The connection structure for a linear heating element according to claim 3, wherein the connection portion between the pipe-shaped terminal and the power supply conducting wire is fixed by using a heat-shrinkable tube or by resin molding.