KR101609675B1

KR101609675B1 - Electric heating cable

Info

Publication number: KR101609675B1
Application number: KR1020150186388A
Authority: KR
Inventors: 한팔오
Original assignee: 한팔오
Priority date: 2015-12-24
Filing date: 2015-12-24
Publication date: 2016-04-05

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-thermal cable using electricity, and more particularly, to a electro-thermal cable in which a heating element (electric heating element) for heating is enclosed in a cable with an insulating material made of polyimide.

Description

ELECTRIC HEATING CABLE

Cables that generate heat using electricity are also used in industrial applications for home heating, freezing, or frost protection.

As a kind of electric heating cable, conventionally, an insulation coating is applied to a wire, a contact portion is made to expose a part of the wire to the cover, and a hot wire such as a nichrome wire is wound to contact the wire, A heating cable has been used.

However, in this heating cable, it is very important to maintain the contact state between the hot wire and the electric wire. However, there is a possibility that the contact state is damaged by the movement or twist of the cable. Problems can arise.

Korean Patent No. 10-0898592 (May 13, 2009) Korean Patent No. 10-1555786 (September 18, 2015)

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a polyimide having good adhesion and excellent heat resistance, which is formed by covering an electric hot wire and a portion where the hot wire contacts the electric wire by tightly contacting the hot wire and the electric wire, To thereby provide a heat conductive cable.

In order to achieve the above object, the present invention provides a heat transfer cable comprising: a wire; A primary insulation sheath covering said wires; A heat transfer element arranged to surround the outside of the insulation coating; And a secondary insulation coating which insulates and coats the conductive material, wherein a silicon insulation coating is used as the primary insulation coating, and the secondary insulation coating is a polyimide material, It is preferable to coat it with insulation.

In the heat-conducting cable of the present invention, a penetration portion is formed at a predetermined interval so that a part of the electric wire is exposed to the outside on a part of the silicon insulation coating, and the penetration portion is a clamp- And a part of the heat conductor is wrapped around the through-hole of the insulation coating so as to be in contact with the electric wire, and the polyimide material insulation cover is made of a polyimide tape, And a portion of the wire exposed through the penetrating portion is melted and melted, and is hardened and covered.

Further, in the electrothermal cable according to the present invention, the polyimide tape has an adhesive layer formed on the surface on which the heat conductor is wound, and is adhered and wound.

Further, it is further characterized in that an insulating material made of silica or glass fiber is further coated on the above-mentioned polyimide coating of the electrothermal cable.

According to another aspect of the present invention, there is provided a method of manufacturing an electro-thermal cable, comprising: forming a penetrating portion at a predetermined interval so that the electric wire is exposed to the outside on a part of the primary insulating coating coated with the electric wire; Forming an adhesive layer on one surface of the polyimide tape to be a material of the secondary insulation coating; The polyimide tape is adhered to the polyimide tape in the same longitudinal direction on the adhesive layer of the polyimide tape, and the polyimide tape bonded to the heat conductor is wound on the primary insulating tape so that the heat- step; And forming the secondary insulation coating by melting the polyimide tape to which the conductive material is adhered while being wound on the secondary insulation coating.

In the method of manufacturing the electrothermal cable, the polyimide tape is wound around the first insulating coating so that the heat conductive member can be brought into contact with the penetrating portion, Or the polyimide tape is wound on the primary insulation coating so that the heat transfer body can contact the penetration portion in a state where the heat transfer body is adhered to the polyimide tape.

The heat transfer cable of the present invention ensures firm contact between the electric wire and the heat conductor through the penetration portion, thereby preventing the contact failure from occurring.

Further, the heat conductive cable of the present invention uses a coating material of polyimide material so that the contact state between the electric wire and the heat conductor can be sufficiently maintained by the elasticity of the polyimide material even if the heat conductive cable is bent.

Further, in the heat-conducting cable of the present invention, the covering material of the silicone material encapsulates the electric wire, thereby making it easy to form the penetrating part for exposing the electric wire to the outside.

Further, the heat-conducting cable of the present invention can be made of a cable which can provide additional coating on the polyimide-coated sheath and perform various heating according to the necessity.

Further, in the heat conductive cable of the present invention, the heat conductor is adhered to the polyimide tape and is wound together to facilitate manufacture, and the contact state between the wire and the heat conductor is further strengthened.

In addition, the method of manufacturing the heat-conducting cable of the present invention can make the cable by winding the heat conductor and the polyimide material band at one time, saving manufacturing time and cost, and improving the durability of the winding, do.

1 is a perspective view showing each component of a heat transfer cable of the present invention.
2 is a perspective view showing a state in which a heat conductor is wound in a state where a penetration portion is formed in a silicon material primary insulation coating in the heat transmission cable of the present invention.
3 is a perspective view showing an embodiment of a tool for making a penetration according to the present invention.
4 is a perspective view showing an example of a state in which the polyimide re-band is wound in a state where the heat conductor of FIG. 2 is wound in the heat transmission cable of the present invention.
5 is a perspective view showing a state in which the polyimide re-band is wound up in a superposed state as another example of the embodiment of FIG.
Fig. 6 is a perspective view showing an example in which the heat conductor is preliminarily adhered to the polyimide re-band in the embodiments of Figs. 4 and 5 so as to be wound.
Fig. 7 is a perspective view showing another example of a method for winding a polyimide re-band and a heat conductor according to the present invention.

The heat conductive cable of the present invention comprises: a wire; A primary insulation sheath covering said wires; A heat transfer element arranged to surround the outside of the insulation coating; And a secondary insulation coating which insulates and coats the conductive body. Preferably, the primary insulation coating is a silicone insulation coating, and the secondary insulation coating is a polyimide material, It is a polyimide insulation coating that insulates and coats the primary insulation coating together.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. As preferred embodiments, the primary insulation coating is described as a silicon-insulated coating, and the secondary insulation coating as a polyimide insulation coating.

1 is a perspective view showing an embodiment of each component of the heat transfer cable according to the present invention. And Fig. 2 is a perspective view showing a state in which the heat conductor is wound in a state in which the penetration portion is formed in the silicon insulation coating.

The heat transfer cable (100) according to an embodiment of the present invention includes an electric wire (1) a primary insulation coating (2) covering the electric wire, a heat transfer element (3) arranged to surround the outside of the insulation coating, And a polyimide insulating coating (4) for covering.

It is also preferable that the wires (1) are arranged in parallel with each other in a state in which the wires (1) are spaced apart from each other by a certain distance. The wire (1) may be of three strands, or only one strand may be used if necessary. The electric wire 1 may be a general electric wire or a variety of electric wires capable of applying electric power according to the application to be used.

A primary insulation coating (2) is wrapped around the outer surface of the electric wire (1) to form an insulation coating. This electric wire 1 is connected to a separate external power source so that the electric heater 3 can generate heat. The primary insulation sheathing 2 has at least one through-hole 21 made to expose the electric wire 1 to the outside at a predetermined interval. Preferably, the penetrating portion 21 is provided at regular intervals, and the penetrating portion 21 is arranged so as to be exposed alternately with the electric wires 1. [ Thus, it is preferable that electric power can be passed through the heat conductive member 3. In addition, the primary insulation sheath 2 can be well insulated by covering the electric wire 1 well. In addition, in order to make the penetration part 21, It is important to have good endurance. It is also important that the heat conductor 3 can be tightly wound on the outside thereof. Thus, the primary insulation coating is preferably a silicone insulation coating.

The heat conductor (3) is wound around the outside of the primary insulation coating (2) to generate heat. All of the conventional heat transfer elements 3 that generate electricity in the form of being wound by electricity can be used, and any of these winding forms can be used. That is, as shown in the drawing, the electric wire 1 is brought into contact with the electric wire 1 at a predetermined interval and is heated to generate electricity. The material may be nickel-chromium alloy, so-called nichrome wire, iron chromium wire, copper chrome wire, or filament material, which are variously wound to generate electricity as an energy source.

The outer surface of the heat conductor 3 is insulated with the polyimide insulating coating 4. The polyimide material is resistant to high temperatures and is resistant to breakage without being damaged, so it is advantageous to use at high temperature and has good elasticity. Therefore, when the heat conductive member 3 is entirely covered, the heat conductive member 3 can be maintained in contact with the electric wire 1 through the penetrating member 21 well.

Fig. 3 shows a perspective view of a tool 9 for making the penetration portion 21 so that the wire 1 is exposed to the outside in the primary insulation coating 2. Fig. As shown in the figure, upper and lower blades 91 and 92 having a predetermined width are provided at the upper and lower portions, and a portion of the wire 1 is exposed in the primary insulation coating 2 in the same manner as a forceps Thereby forming the penetrating portion 21. [

Fig. 4 is a view showing that a polyimide band is wound around the heat conductor 3 as an embodiment of the heat transfer cable of the present invention at intervals. As shown in Fig. 1, in order to cover the secondary insulation material, a polyimide band 41 is wound around the heat insulation body in a state where a penetration portion is formed in a primary insulation coating of the same material as the silicone material of Fig. 2 Is shown in FIG. As shown in the figure, the polyimide band 41 is melted when it is heated above the melting point of the polyimide in a state of being wound without overlapping, and is spread over the heat transfer member 3 to be coated. Thus, the polyimide insulating cover 4 is completely insulated and covered with the heat transfer member 3 like a conventional insulating cover. That is, the polyimide band 41 may be melted and fused so as to be fused so that the interval of the windings can be adjusted according to the entire diameter of the winding and the width and thickness of the polyimide reed band 41. The general polyimide resin can be used up to 250 ° C., and is excellent in heat resistance. Also, it has less change in properties from low temperature to high temperature, good impact resistance, dimensional stability, elasticity, resistance to friction, excellent electric characteristics, The melting point of the general polyimide resin is 700 ° C, which is very high. Therefore, it is advantageous to use as an insulation material coating. Especially, it is suitable for maintaining the fault condition of electric wire and electric conductor because of less change in characteristics from low temperature to high temperature, good impact resistance, good dimensional stability and low friction resistance.

The polyimide insulation coating 4 melts and hardens again to cover the heat conductive member 3 so that the heat conductive member 3 and the electric wire 1 are bonded to each other through the penetrating member 21, And makes them more firmly adhered to each other at the contact portion. Thus, even when the heat transfer cable 100 is bent or moved, the contact state between the heat transfer element 3 and the electric wire 1 can be maintained well. Further, it is possible to further protect the heat conductor 3 and the electric wire 1 from moisture or contamination. The polyimide tape for making the polyimide material coating according to the present invention may have a thin and wide tape-like cross section and may also be in the form of a wire. The important thing is that the polyimide material melts and then solidifies again so that the insulation coating is integrated so that it covers the heat conductor 3 and all other necessary parts. As a method of forming the polyimide insulation coating of the present invention, it melts and is wound while being hardened, and the overlapped portion is made into a completely integrated body and is firmly bonded to the heat conductive member 3 to become a hard covering.

5, unlike FIG. 4, the polyimide tape 41 having a thin rectangular cross section may be melted and covered with heat in a state in which the polyimide tape 41 is not rolled up. Fig. 5 is a view showing another embodiment of the electrothermal heating cable according to the present invention, in which a polyimide re-band is partially overlapped on a heat transfer member and wound without a space or a gap therebetween. 4 except that the polyimide material band 41 is partially overlapped on the heat conductor 3 without any empty space.

Preferably, an adhesive layer (not shown) is formed on the surface of the polyimide tape 41 adhered to the heat conductive member 3 in the form of a tape, and the outer surface of the heat conductive member 3 is completely overlapped and bonded It is rolled up, and then it is melted by applying heat. When the polyimide tape has an adhesive layer at a portion where the tape contacts the heat conductor, it is preferable that the polyimide tape adheres more accurately and firmly at the time of winding, so that the coating layer can be formed well during heating.

A preferable example of such a polyimide material which can be used as an insulating material is a polyimide high heat-resistant heat-bonding film. When the polyimide material is melted and cooled down after being heated and cooled again after the polyimide material is wound and fixed in the manner shown above with the polyimide high heat-resistant heat-sealable film on the heat conductor, it becomes an insulation coating integrally. Any method of heating from a rolled state to a high temperature above the melting point of the polyimide as a whole can be used. Preferably, the polyimide tape 41 is heated in a high temperature furnace (not shown). In this case, the polyimide tape 41 is rolled over the furnace at a high temperature, will be. The temperature at which the electric conductor 3 and the electric wire 1 and the primary insulation coating 2 are passed to the furnace at a certain temperature while being wound by the band 41 is determined by the temperature of the furnace, The temperature in the furnace must be such a temperature that the molten metal 41 can melt and pass completely through the band and the winding boundary of the band can be eliminated and the time in the furnace is long enough to allow the band 41 to melt, It is better not to stay, but to pass through the furnace for a time that can be made into an all-in-one type of fabric by coming out of the furnace and hardening again. That is, the temperature to be heated should be not lower than the temperature at which the polyimide tape 41 is sufficiently melted, and the time for the polyimide tape 41 to melt should be such that the coating can be formed.

Further, after coating with the polyimide insulating coating (4) of the present invention, it is possible to add another coating of insulating material. When a polyimide insulation coating (4) is coated with a polyimide insulation coating (4) and then an insulating material coating made of PVC material, silica or glass fiber is further added on the polyimide insulation coating (4) Is more preferable. The additional coating may be coated according to conventional methods and may serve to protect the wires and insulation.

Fig. 6 is a perspective view showing an example in which the heat conductor 3 is preliminarily bonded to the polyimide re-band 41 in the embodiment of Figs. 4 and 5 so as to be wound together.

As shown in Fig. 6, the polyimide tape 41 is coated with a polyimide tape 41 on the surface on which the adhesive layer is formed, in the same manner as the longitudinal direction of the polyimide tape 41, ) Are arranged side by side at predetermined intervals and are attached in advance. 4 and 5 so that the polyimide material band 41 having the heat conductor 3 attached thereto is not brought into contact with the heat conductor 3, the polyimide material insulating cover 4 is wound around the heat conductor 3 It can be more firmly and reliably protected. In addition, when the polyimide band is formed, the heat conductive member 3 is also prepared. Therefore, when the polyimide band is wound, the two pieces of the heat conductive member 3 are wound on the primary insulating cover 2, There is an advantage that two or more heat transfer elements 3 can be easily wound by simply winding the polyimide material band 41 around. If the size of the penetration portion 21 of the primary insulation coating 2 is made large enough, the electric conductor 3 and the electric wire 1 can be easily brought into contact with each other and strongly adhered to each other. The contact state between the electric conductor and the electric wire can be maintained well even if it is bent or wound.

As described above, the polyimide material band 41 with the heat conductor 3 attached thereto can be wound as shown in FIGS. 4 and 5 so that the heat transfer elements 3 are not in contact with each other. However, as in the embodiment of FIG. 7, The body 3 may be wound together with the polyimide material band 41 without previously attaching the body 3 to the polyimide material band 41. [

7 is a perspective view showing an example of a method for winding a polyimide tape and a heat conductor according to the present invention. The primary insulation coating 2 covering the electric wire 1 is rotated in the clockwise direction while advancing in the direction of the arrow shown with the penetrating portion 21 as shown in the figure. At this time, the heat conductive member 3 and the polyimide material band 41 are attached to the primary insulation coating 2 while being in contact with each other. As the primary insulating coating 2 advances and rotates with the heat conductive member 3 and the polyimide material band 41 wound around rollers (not shown) or the like, the primary insulating coating 2 is wound around a roller And are attached together. At this time, the heat conductor 3 is wound around the primary insulation coating 2 while being adhered to the polyimide material band 41 on which the bonding portion is formed. The conductor 3 may be bonded to the polyimide tape 41 and then wound together or the polyimide tape 4 may be wound on the polyimide tape 4 in a state in which the conductor 3 is first in contact with the primary insulation coating 2 41 may be wound in such a manner that the heat insulating member 3 is also adhered while the primary insulating coating 2 is adhered. It is preferable that the heat transfer member 3 is first bonded to the polyimide tape 41 and wound, thereby reducing the possibility of contact between the heat transfer members 3.

In FIG. 7, the primary insulation sheath 2 rotates and advances, but this is a preferred example, and the heat conductor 3 and the polyimide re-band 41 may be rotated and wound, and various winding methods may be used. In particular, although two heat transfer elements 3 are arranged in the polyimide material band 41 in Fig. 7, more heat transfer material 3 of a plurality of strands can be arranged and wound on the polyimide material band 41 , The workability can be improved as the plurality of strands are wound, but the limit may arise due to contact with the electric wire 1 through the penetration portion 21. [

Wires - 1 Primary insulation sheath - 2
Electrothermal material - 3 Polyimide material Insulation cloth - 4
Thermal Cable - 100 Polyimide Reband - 41

Claims

wire; A primary insulation sheath covering said wires; A heat transfer element arranged to surround the outside of the primary insulation coating; And a secondary insulation coating for insulating and coating the heat conductor, the method comprising:
Forming a penetrating portion at a predetermined interval so that a part of the electric wire is exposed to the outside on a part of the primary insulation coating coated with the electric wire;
Forming an adhesive layer on one surface of the polyimide tape to be a material of the secondary insulation coating;
The polyimide tape is wrapped on the primary insulation coating so that the heat transfer body is in contact with the penetration portion, or the polyimide tape is wound on the polyimide tape Winding on the primary insulation coating so that the heat transfer body can contact the penetration portion in a state where the heat transfer body is adhered; And
The polyimide tape to which the heat conductor is adhered is melted in a state that the polyimide tape is wound on the secondary insulation coating to form the secondary insulation coating;
Wherein the heat-conducting cable is made of a thermosetting resin.

The method according to claim 1,
In the step of adhering and arranging the heat conductor in the longitudinal direction on the adhesive layer of the polyimide material band,
Wherein the heat-conductive cable is made of a thermoplastic resin.

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