JPH07230871A - Connecting method for linear heating element - Google Patents

Abstract

PURPOSE:To provide electric connection by simple operation by inserting an inserting needle formed of a conductor in the central part from an end surface of a linear heating element, and compressing a carbonaceous conductor between the inserting needle and an insulating covering material. CONSTITUTION:A linear heating element 2 is formed by being covered with an insulating covering material 2b composed of a waterproof insulating material with a conductor 2a composed of a carbonaceous short fiber bundle as its center. Woven fabric or braids of heat resistant fiber may be interposed between the conductor 2a and the insulating covering material 2b. An electric current is flowed to the conductor 2a, and it is used as a heating element for heat insulation and heating. In a connecting body 1 composed of conductive metal or the like, the tip is formed as a sharply projecting inserting needle 1a. The inserting needle 1a is inserted up to a proper depth in a central part of the conductor 2a from an end surface of the linear heating element 2. Electric connection between mutual heating elements 2 or to an external circuit is performed through the connecting body 1. Since a connecting part is covered with the insulating covering material 2b, disconnection of the conductor 2a is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear heating element in which carbonaceous short fibers are used as a core wire and the periphery of the core wire is covered with an insulating coating, or the linear heating element and a general covered electric wire. It is about how to connect.

[0002]

2. Description of the Related Art In recent years, a linear heat generated by covering carbonaceous short fibers with an insulating coating on a snow-melting device buried in a road or roof in a snowfall area and a heating or heat-insulating device buried in a floor or wall of a building. The body has come to be used as an effective heat carrier.
This heating element is very effective in that it has excellent flexibility, strength and thermal efficiency, and that a desired electric resistance value can be easily set.

[0003]

In this linear heating element, since the conductor serving as the core wire is formed by collecting carbon short fibers in a linear shape, the core wire itself is compared with respect to tension and twist. Are vulnerable. Therefore, when electrically connecting the linear heating elements to each other or between the linear heating element and the covered electric wire, twist the core wire of the other linear heating element or the covered wire by twisting the core wire from which the coating of the linear heating element is removed. When connecting or crimping using a widely known tubular crimp fitting,
There is a possibility that the core wire of the linear heating element may be partially sheared or torn off by the load at the time of joining.

Therefore, the main object of the present invention is to insert the insertion needle portion of the connecting body made of a conductor into the center of the core wire from one end surface of the linear heating element, and insert the carbon core wire into the insertion needle insertion portion. To provide a connection method capable of reliably performing electrical connection by compressing between the outer peripheral surface over the entire length and the insulating coating material without causing the above-mentioned partial shearing and tearing by a simple operation. It is in.

[0005]

In order to achieve the above object, the present invention takes the following technical means. That is, in the method for connecting a linear heating element according to the present invention, a connector having an insertion needle (1a) with a sharp tip at least at one end.
(1) is made of a conductive metal material, and the insertion needle for this connector (1)
(1a) is a carbon fiber short core wire (2a) and the core wire (2a) is covered with an insulating coating material (2b) is inserted into the center of the core wire (2a) from one end surface of the linear heating element (2) , The carbon core wire (2a)
Characterized by compressing between the outer peripheral surface of the insertion needle (1a) and the insulating coating material (2b) to electrically connect the linear heating element (2) and the connection body (1). Is.

[0006]

[Operation] According to the above connection method, by inserting the sharp insertion needle (1a) of the connection body (1) from one end surface of the linear heating element (2) into the center of the carbon core wire (2a). In a state where the core wire (2a) is bare and not exposed to the outside, between the outer peripheral surface of the insertion needle (1a) and the insulation coating material (2b) over the entire insertion length of the insertion needle (1a) inside the insulation coating material (2b). Since they are connected in a compressed state between the core wire (1a), even if the core wire (1a) is a relatively fragile bundle of short carbon fibers, it does not cause partial shearing, tearing, or wire breakage, etc. Moreover, it can be electrically connected to the connecting body (1) with high efficiency.

[0007]

Embodiments of the present invention will be described below with reference to the embodiments shown in the drawings. 1 to 3, reference numeral (2) indicates a linear heating element. This linear heating element (2) has a carbon short fiber as a core wire (2a) and the core wire (2a) is covered with a water resistant insulating coating material (2b) through a woven cloth or a braid (2c) of heat resistant fibers. Has been done. The core wire (2a) is a bundle of short-back fibers, and has a large heat generation area, so that heat generation efficiency is good, and far infrared rays are emitted, so that heating efficiency is high.

In connecting the linear heating element (2) to, for example, a general covered electric wire, according to the present invention, a rod-shaped connecting body having an insertion needle (1a) with a sharp tip at least at one end is used.
(1) is prepared, and the insertion needle (1a) of the connection body (1) is inserted from one end surface of the linear heating element (2) to the center of the core wire (2a) to an appropriate depth. By this insertion, the carbon core wire (2a)
Is compressed between the outer peripheral surface of the insertion needle (1a) and the insulating coating material (2b) to electrically connect the linear heating element (2) and the connection body (1). In this connected state, the core wire (2a) is not exposed to the outside naked, and is compressed and electrically connected to the insertion needle (1a) inside the insulating coating material (2b), Core wire (2a)
Even if is a relatively fragile aggregate bundle of short carbon fibers, reliable and highly efficient electrical joining can be obtained without causing partial shearing, tearing, or line breaking.

[0009] Thus, the other end of the connection body (1) is a covered electric wire to be connected, for example, two covered electric wires (3), core wires (3a) of (3),
The (3a) may be overlapped and the periphery thereof may be crimped by an existing tubular metal crimp sleeve (10) or the like to be connected.

The joint portion thus connected is used by being covered with an appropriate synthetic resin connector. FIGS. 4 to 7 show an example of the connector, which is a cylindrical body (4) having both ends opened, and a ring-shaped body rotatably fitted in one end opening of the cylindrical body (4). Coupling (5) and a ring-shaped tightening coupling (7) screwed into a screw (6) formed on the inner surface of the other opening of the tubular body.
And the packings (8) and (8) mounted on the inner surfaces of the left and right couplings (5) and (7), and the cylindrical shape of a predetermined length that stretches the inner surfaces of these packings (8) and (8). It is composed of a spacer (9). The packings (8) and (8) are made of a natural or synthetic resin material having appropriate elasticity. Further, the left and right couplings (5) and (7) are formed so that the inner peripheral surfaces thereof are inclined so that their diameters become smaller toward the outer ends, and the tightening couplings (7 ) Screwed toward the center of the tubular body (4), the inner packings (8), (8)
Are formed so as to compress the outer peripheral surfaces of the linear heating element and the covered electric wire inserted in the connector.

When the connector constructed as described above is used, as shown in FIG. 7, the left tightening coupling is used.
With the (7) separated from the tubular body (1), insert the linear heating element (2) through the hole of the coupling (5) on the right side of the tubular body and pull it out to the left, Packing (8) for coupling (7)
Insert the two covered wires (3), (3) into the
a), (3a) and (2a) on top of each other
After press-fitting and coupling with 0), the tightening coupling (7) may be screwed onto the screw (6) of the tubular body (4). As a result, the internal packings (8), (8) are compressed between the end surface of the tubular spacer (9) and the inclined surfaces of the left and right couplings, and the compressive force is the linear heating element (2) and the coating. Press the outer peripheral surface of the wires (3) and (3),
As a result, the inside of the connector is completely watertightly sealed, and at the same time, the coated wires (3) and (3) and the linear heating element wire (2) are strengthened in a state where mechanical strength is imparted through the connector. Can be connected to.

The connecting body (1) in the present invention is shown in FIGS.
It can be formed in various forms as shown in FIG. FIG. 8 shows that the other end of the insertion needle (1a) is bifurcated and the end portion thereof is, for example, the covered electric wire (3), (3) shown in FIGS.
Formed into insertion needles (2b), (2b) having a thickness that can be inserted into the end face of the. Figure 9 shows the insertion needles (1a) and (1a) for the linear heating element on the left and right.
FIG. 10 shows one of which is formed as an insertion needle (1b) for a covered electric wire. Further, in FIG. 11, two insertion needles (1a) for the linear heating element are provided at one end and an insertion needle (1b) for the covered electric wire is provided at the other end. In addition, FIG. 12 is similar to that shown in FIGS.
Only a) is formed, and in this case, an example in which two of them are formed is shown. FIG. 13 shows an example in which the connector (1) shown in FIG. 12 is formed by bending a wire.

The connector (1) having the insertion needle (1a) for the linear heating element and the insertion needle (1b) for the covered electric wire on the left and right as shown in FIGS. It may be attached in advance to the connector made of synthetic resin as shown in FIGS. 14 and 15. In this connector, the inner surface of both ends of the tubular body (11) with both ends open is formed in a trumpet shape, and the ring-shaped coupling (12) is formed on the outer peripheral surface of the opening.
(12) is screwed. Further, ring-shaped elastic packings (13) and (13) are mounted inside the trumpet-shaped portion of the tubular main body (11). Then, for example, the connecting body (1) shown in FIG. 9 is fixed to the axial core portion of the tubular main body (11). Therefore, in such a configuration, the linear heating element is inserted through the holes of the coupling (12) and (12) with the coupling (12) and (12) loosened.
Insert (2) and (2) and insert the tip of the insertion needle (1)
After pushing it into b), screw the left and right couplings (12) and (12) toward the center of the tubular body (11) to
2) Pack the bosses (12a) and (12a) formed on the inner surface of (12).
(13) and (13) may be compressed. In this case, the diameters of the holes of the couplings (12), (12) are preset so that they can freely rotate between the couplings (12), (12) and the linear heating elements (2), (2). Set it. Also, as shown in FIG. 15, if a sliding ring (14) made of a slippery material is interposed on the sliding contact surface between the boss (12a) of the coupling (12) and the packing (13), the packing (13) Is less affected by the rotational torque of the coupling, and the packing can be compressed smoothly.

Although the embodiments considered to be typical of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments, and the constitutional requirements are provided.
In addition, the object of the present invention can be achieved and the invention can be appropriately modified and carried out within the range in which the following effects are exhibited.

[0015]

As described above, according to the present invention, the sharp insertion needle of the connector is inserted into the center of the carbon core wire from one end surface of the linear heating element, so that the core wire is bare and not exposed to the outside. , The core wire is a relatively fragile aggregate of short carbon fibers because the outer circumference of the insertion needle and the insulation coating are connected inside the insulation coating over the entire length of insertion of the insertion needle. Even bundles can be reliably and highly efficiently electrically joined without causing partial shearing, tearing, or line breakage, and simply by inserting the insertion needle into the end face of the linear heating element. Since it can be joined to the connecting body, there is an excellent effect that the operation is extremely easy.

[Brief description of drawings]

FIG. 1 is a perspective view showing a connecting process of a method according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which an insertion needle is inserted into a linear heating element.

FIG. 3 is a cross-sectional view showing a state in which a linear heating element and a covered electric wire are connected by a connection body.

FIG. 4 is a front view showing an example of a connector used to cover a connecting portion.

FIG. 5 is a cross-sectional view of the connector.

FIG. 6 is a cross-sectional view showing a usage state of the connector.

FIG. 7 is a partial sectional front view showing a process of using the connector.

FIG. 8 is a front view showing another example of the connection body according to the present invention.

FIG. 9 is a front view showing still another example of the connection body according to the present invention.

FIG. 10 is a front view showing another example of the connection body according to the present invention.

FIG. 11 is a front view showing still another example of the connection body according to the present invention.

FIG. 12 is a front view showing another example of the connection body according to the present invention.

FIG. 13 is a front view showing still another example of the connection body according to the present invention.

FIG. 14 is a cross-sectional view showing another example of the connector used in the present invention.

FIG. 15 is a partial sectional front view showing still another example of the connector.

[Explanation of symbols]

 (1) Connector (1a) Insertion needle (2) Linear heating element (2a) Core of linear heating element (2b) Coating of linear heating element

Claims (1)

[Claims] 1. A connecting body (1) having an insertion needle (1a) having a sharp tip at least at one end is formed of a conductive metal material,
Insert the insertion needle (1a) of this connection body (1) into a carbon short fiber core wire.
(2a) and the core wire (2a) is inserted into the center of the core wire (2a) from one end surface of the linear heating element (2) covered with an insulating coating material (2b),
The carbon core wire (2a) is compressed between the outer peripheral surface of the insertion needle (1a) and the insulating coating material (2b) to electrically connect the linear heating element (2) and the connection body (1). A method of connecting a linear heating element, characterized in that