KR101954140B1 - Protection method and structure of heating cable power connection part - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a structure for protecting a power connection part of a heating cable using electric power, and more particularly, to a method of protecting a power connection part of a heating connection cable by inserting a polymer tube when a heating part and a non- The present invention relates to a method and a structure for protecting a power connection of a heating cable having an excellent impact resistance and a stress crack property. The method includes a tube extrusion step, a shrink tube processing step, a shrink tube cutting step, a reinforcing pipe extrusion step, The heating cable manufacturing step, the heating cable manufacturing step, the heating cable cutting step, the lead wire forming step, the lead wire connecting preparation step, the shrink tube insertion step, the reinforcing pipe inserting step, the connection connecting step, , A primary shrink tubing insulation step, a connection connection protecting step, a secondary shrink tubing joining step, and an adhesive layer forming step to form a heating cable and a lead wire of a heating cable A first shrinking tube is connected to the heating wire of the heating cable and the wire of the lead wire is connected to the first shrinking tube so that the portion insulated by the first shrinking tube is inserted into the reinforcing pipe, The secondary shrink tube surrounds the outside of the reinforcing pipe and both ends cover the adhesive layer formed on the outer surface of the lead wire and the secondary insulation protective coating layer of the heating cable, The heating cable is connected to the power connection part of the heating cable.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cable,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a structure for protecting a power connection part of a heating cable using electric power, and more particularly, to a method of protecting a power connection part of a heating connection cable by inserting a polymer tube when a heating part and a non- -stress crack property, and impact resistance of a heating cable.

In general, heating cables are used to prevent frosting of commercial buildings such as apartments and officetels, to maintain the temperature of chemical plant piping or tanks, to maintain long-distance pipeline temperature, to snowy roads, to prevent icicles, Is used not only as a commercial or industrial product, but also as a variety of warm products for home and medical use.

Although the electric heating system allows the heating to be maintained by using electric power, many troubles are caused in the connection part of the conventional heating cable and the power cable at this time.

As shown in FIG. 1, a heating cable is disposed on the innermost side of the heating cable, and the heating wire is extruded and insulated with a polymer resin to form a heating wire, and then the heating cable is assembled and laminated with an insulating coating.

In the power connecting structure of a conventional heating cable, a lead wire of a non-heating portion connected to a power source portion and a heating wire of a heating cable are connected to a metal crimp terminal, and a connecting connection portion formed by inserting a heat- Have.

Such a power connection structure has a problem such as fire due to vibration generated in the external environment after the construction, disconnection due to shrinkage, and the like, since the terminal connection portion is short-circuited due to the impact generated during construction,

Further, when the heating cable is embedded in the bottom surface, there is a problem that the adhesion due to the lack of compatibility between the polymer insulating cover and the shrinking tube is insufficient, and the short circuit is caused by moisture penetration.

As described above, the power connecting structure of the conventional heating cable is disadvantageous in construction and frequent occurrence of faults, resulting in disadvantages due to post-maintenance.

The prior art and the patent literature developed until now to improve these characteristics will be described as follows.

Korean Registered No. 10-0639161 uses stainless steel M.I cable (mineral insulated cable) which is resistant to moisture and produced in an infinite length in the regenerative heating system. Then, using a MI cable made of SUS 316 made of stainless steel, a heat-generating portion and a non-heat-generating portion side are connected and connected, and a 0.7 mm thick concave portion formed concentrically with the center of the cold lead portion of the non- The heating part is welded in a state of being inserted. The connection part is covered with a capsule filled with magnesia which is waterproofed with KE-441 silicone so as to block moisture.

In the prior art described above, since fine recesses are formed in the end face of the concentric bar in order to connect the heat generating portion to the concentric core, there is a problem that the manufacturing cost is increased due to the formation of the groove and that the technical difficulty causes a drop in the weak impact easily And the capsule is extremely tightly sealed at the sealing portions at both ends of the capsule, which is put in close contact with the heat insulating portion formed on the outer surface of the cold lead portion of the heat generating portion side heating cable and the non-heat generating portion, It is.

In order to solve such a problem, the present invention provides a power connecting structure of a heating cable excellent in resistance to cracking and impact resistance by inserting a tube made of a polymer into a connecting connection portion when a heating portion and a non- There is a first purpose in providing.

Another object of the present invention is to provide a method for solving the problem of leakage due to moisture penetration by improving the adhesion to the shrink tube by forming an adhesive layer for improving the adhesion to the heating cable insulation coating.

In order to accomplish the above object, the present invention is to provide a polyolefin resin having high resistance to cracking and shock resistance, a polymer resin selected from nylon resin, fluorine resin, polyacetal resin and polyester resin, A tube extruding step of extruding a tube having a different inner diameter so as to have a negative tolerance with an inner diameter smaller than the outer diameter of the tube; A shrink tube processing step of inserting a tube extruded in the tube extruding step and expanding the inner diameter of the tube to a larger tolerance than an outer diameter of a wire to be used, thereby processing the tube into a shrink tube having a disposition of polymer; A shrinking tube cutting step of cutting the shrinking tube processed in the shrinking tube processing step to a size according to the use application; A reinforcing pipe extruding step of extruding a reinforcing pipe with a polymer resin selected from a polyolefin resin having high resistance to cracks in stress and impact resistance, a nylon resin, a fluorine resin, a polyacetal resin, and a polyester resin; A reinforcing pipe cutting step of cutting the reinforcing pipe extruded in the reinforcing pipe extruding step to a size according to the use purpose; A heating wire manufacturing step of forming an insulated heating wire which integrally extrudes a polymer resin on the outer circumferential surface of the heating wire to form a primary insulating coating layer; A heating cable manufacturing step of assembling a plurality of heating lines in which a primary insulation coating layer is formed so as to be insulated in the heating line manufacturing step and extruding the heating wires to the outer periphery thereof with a polymer resin to form a heating insulation cable having a secondary insulation protective coating layer; A heating cable cutting step of cutting the heating cable manufactured in the heating cable manufacturing step to a length corresponding to the purpose of use; A lead wire constituting step of constituting a lead wire constituting a plug so as to be connected to an outlet at one end to apply power; The insulating coating of the lead wire obtained in the lead wire forming step is removed and the secondary insulation protective coating layer of the end portion of the heating cable cut by cutting to a length corresponding to the purpose of use in the heating cable cutting step is removed, A lead wire connecting preparation step of peeling off the primary insulating coating layer of the exposed fumed wire to form a lead wire connecting part; Inserting the shrink tube inserted in the shrink tube cutting step in the shrink tube processing step in the secondary insulation protective coating layer of the heating cable in which the insulating coating layer is removed in the lead wire connection preparation step and the primary insulation coating layer of the heating wire, ; A reinforcing pipe inserting step of inserting a reinforcing pipe into the lead wire side; A connection connecting step of integrally connecting and connecting the heating wire and the lead wire of the heating cable into which the shrink tube is inserted and the reinforcing pipe is inserted by welding or clamping with a terminal clip; The connection connecting portion connecting the heating wire of the heating cable and the wire of the lead wire in the connecting connection step is covered with the shrink tube inserted into the primary insulation coating layer of the heating wire so as to shrink the shrink tube by applying hot air or hot air to the shrink tube. And the shrink tube is integrally tightly bonded to the connecting connection portion so as to insulate the shrink tube; In the primary shrink tubing insulation step, each heating wire is connected to the electric wire, and the reinforced pipe inserted into the lead wire is transferred to the connecting connection portion so that the portion insulated by the shrink tubing is protected, so that both ends of the reinforcing pipe are connected to the outer surface of the lead wire, Covering the secondary insulation protective coating layer of the connection protection circuit; The secondary shrink tube prepared by inserting into the heating cable is transferred to cover the reinforcing pipe which is inserted into the inside to protect the connecting connection portion so that both ends cover the secondary insulation protective coating layer of the lead wire and the heating cable, And the shrink tube is integrally tightly bonded to the outer surface of the secondary insulation protective coating layer of the reinforcing pipe and the heating cable so as to protect the hermeticity of the lead wire, and a secondary shrink tube combination step of: A part of the end of the lead wire which is connected to the receptacle and connected to the receptacle at one end to constitute the plug for applying the power is passed through a heating oven or heater box kept at 50 to 100 ° C while impregnating a coating bath containing the reactive silane, An adhesive layer forming step of coating an adhesive layer with a thickness of 0.1 to 10 mu m is carried out, The heating wire of the heating cable and the wire of the lead wire are integrally connected to each other and are insulated with a primary shrink tube and the heating wire of the heating cable is connected to the lead wire and the portion insulated by the primary shrink tube is inserted into the reinforcing pipe And both ends of the reinforcing pipe are covered with the outer surface of the lead wire and the secondary insulation protective coating layer of the heating cable and the secondary shrinking tube surrounds the outside of the reinforcing pipe and both ends are formed on the outer surface of the lead wire and the secondary insulation protective coating layer of the heating cable And a heat-shrinkable joint is formed by wrapping one adhesive layer.

As described above, according to the present invention, when a heat generating part and a non-heating part of a heating cable are connected to each other, a tube having an internal stress cracking property and an impact resistance is inserted into a connection connecting part, It has no fire hazard due to vibration and shrinkage caused by external environment after construction and improves adhesion due to insufficient compatibility between polymer insulation sheath and shrinking tube when the heating cable is embedded on the bottom surface. It is possible to improve problems such as short circuit and the like.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.
Figure 2 is another process step-by-step for carrying out the present invention.
Fig. 3 is an exemplary view showing the present invention applied to a power connection portion. Fig.
4 is a diagram illustrating an example of a configuration of a power connection portion according to the present invention.

The present invention relates to a polyolefin resin having strong resistance against cracking and resistance to impact and a polymer resin selected from nylon resin, fluorine resin, polyacetal resin and polyester resin so as to have a smaller inner diameter than the outer diameter of a wire to be used, A tube extruding step of extruding a tube having various sizes of inner diameters;

A shrink tube processing step of inserting a tube extruded in the tube extruding step and expanding the tube so that the inner diameter is larger than the outer diameter of the wire or heating cable to be used so as to have a plus tolerance;

A shrinking tube cutting step of cutting the shrinking tube processed in the shrinking tube processing step to a size according to the use application;

 A reinforcing pipe extruding step of extruding the reinforcing pipe 40 with a polymer resin selected from a polyolefin resin having high resistance to stress cracking and impact resistance, a nylon resin, a fluorine resin, a polyacetal resin, and a polyester resin;

A reinforcing pipe cutting step of cutting the reinforcing pipe 40 extruded in the reinforcing pipe extrusion step to a size according to the use purpose;

A heating wire manufacturing step of forming an insulated heating wire (11) by integrally extruding a polymer resin on the outer circumferential surface of the heating wire to form a primary insulating coating layer;

A heating cable 10 in which a plurality of heating wires 11 having a primary insulating coating layer formed thereon so as to be insulated in the heating wire manufacturing step are assembled and extruded with a polymer resin to form a secondary insulating protective coating layer 12, A heating cable manufacturing step of;

A heating cable cutting step of cutting the heating cable 10 manufactured in the heating cable manufacturing step to a length corresponding to the purpose of use;

A lead wire constituting step of constituting a lead wire 20 constituting a plug to be connected to an outlet at one end to apply power;

The insulation coating of the lead wire 20 obtained in the lead wire forming step is removed and the secondary insulation protective coating layer 12 of the heating cable 10 cut at the heating cable cutting step is cut off to a length corresponding to the intended use, A lead wire connection preparation step of removing the secondary insulation protective coating layer 12 to break the primary insulation coating layer of the exposed fume wire to form a lead wire connection part;

 The secondary insulation protective coating layer 12 of the heating cable 10 in which the insulating coating layer is removed from the lead wire connection preparation step and the primary insulation coating layer of the heating wire 11 are processed in the shrink tube processing step, A shrink tube insertion step of inserting a shrink tube;

A reinforcing pipe inserting step of inserting a reinforcing pipe (40) on the side of the lead wire (20);

The heat generating line 11 of the heating cable 10 in which the shrink tube is inserted and the reinforcing pipe 40 is inserted and the electric wire 21 of the lead wire 20 are integrally connected and clamped by welding or by a terminal clip, An access connection step of:

So that the shrink tube inserted into the primary insulation coating layer of the heating wire 11 is covered with the connecting connection portion where the heating wire 11 of the heating cable 10 and the wire 21 of the lead wire 20 are connected in the connection connection step A first shrink tube (31) insulating the shrink tube by shrinking the shrink tube by applying hot air or hot air to the shrink tube to integrally tightly bond the shrink tube to the connection connection site and insulate it;

In the insulation step of the primary shrink tube 31, the heating wires 11 and the wires 21 are connected to each other and the reinforced pipe 40 inserted into the lead wire 20 is protected A connecting connection protecting step of moving both ends of the reinforcing pipe 40 to the connection site so as to cover the outer surface of the lead wire 20 and the secondary insulation protective coating layer 12 of the heating cable 10;

The secondary shrink tube 32 inserted into the heating cable 10 is moved to cover the connecting connection portion to cover the reinforcing pipe 40. The both ends of the reinforcing pipe 40 are connected to the outer surface of the lead wire 20 and the heating cable The shrink tube is heated and shrunk by hot air or a hot gun so that the shrink tube is connected to the outer surface of the lead wire 20 and the reinforcing pipe 40, A secondary shrink tube coupling step of tightly adhering integrally with the outer circumferential surface of the secondary insulating protective coating layer 12 to protect the hermeticity;

A part of the end portion of the heating cable and a part of the end portion of the lead wire constituting the plug so as to be connected to the receptacle at one end by being connected to the receptacle is passed through a heating oven or a heater box maintained at 50 to 100 캜 while impregnating a coating bath containing the reactive silane, A reactive silane is coated to a thickness of 0.1 to 10 mu m to form an adhesive layer,

The heating wire 11 of the heating cable 10 and the electric wire 21 of the lead wire 20 are integrally connected to each other so as to be insulated by the primary shrink tube 31 and the heating wire 11 and the electric wire 21 of the lead wire 20 are connected to insulate the primary shrink tube 31 into the reinforcing pipe 40 and both ends of the reinforcing pipe 40 are connected to the outer surface of the lead wire 20 The secondary shrink tubing 32 covers the outside of the reinforcement pipe 40 and the both ends of the secondary shrink tubing 32 cover the outer surface of the lead wire 20 and the heating cable 10, And the heat-shrinkable joint is formed by wrapping the adhesive layer 50 formed on the secondary insulation protective coating layer 12 of the heating cable.

In the tube extrusion step, a polyolefin resin, a nylon resin, a fluoropolymer, a polyacetal resin, and a polyester resin, which have high resistance to cracking and impact, A tube of 0.1 ~ 10 mm in thickness and 5 ~ 200 mm in diameter is extruded with a polymer resin selected, and in the tube cutting step, the tube produced in the tube extrusion step is cut into a size of 1 ~ 300 mm, The heating cable 10 manufactured in the heating cable manufacturing step is immersed in a coating dye containing a reactive silane and heated in a heating oven or a heater box and the reactive silane is coated on the outer periphery of the secondary insulation protective coating layer 12 of the heating cable 10 to a thickness of 0.1 to 10 μm to form the adhesive layer 50.

The lead wire 20 and the secondary insulation protective coating layer 12 of the heating cable 10 manufactured in the heating cable manufacturing step are removed by 2 to 200 mm and the lead wire 9 and the heating cable 10 are insulated from each other by 5 to 25 mm The primary shrink tube 31 is shrunk and insulated by hot air or a hot gun in the state where the primary shrink tube 31 is inserted into the outside.

The reactive silane used in the adhesive layer forming step may be vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxy-ethoxy-) silane, 3-methacryloxypropyltrimethoxysilane, 3 Methacryloxypropyltriethoxysilane, vinyldimethylethoxysilane, vinylmethyldibutoxysilane, etc. may be used singly or in combination of two or more thereof in an amount of 10 to 25 parts by weight, and the present invention is not limited thereto.

The present invention described above is carried out when a heating cable is applied to a building or a heating mat, and its value in industrial use will be great.

10: heating cable 11: heating wire 12: secondary insulation protective coating layer
20: lead wire 21: wire 31: primary shrink tube
32: secondary shrink tube 40: reinforcing pipe 50: adhesive layer

Claims (3)

A polymer resin selected from a polyolefin resin, a nylon resin, a fluoropolymer, a polyacetal resin, and a polyester resin, which is resistant to stress cracking and impact resistance a tube extruding step of extruding a tube having a diameter of 0.1 to 10 mm and a tube having a diameter of 5 to 200 mm so as to have a smaller inner diameter than the outer diameter of the wire or heating cable to be used, ;
A shrink tube processing step of inserting a tube extruded in the tube extruding step and expanding the inner diameter of the tube to a larger tolerance than an outer diameter of a wire to be used, thereby processing the tube into a shrink tube having a disposition of polymer;
A shrink tube cutting step of cutting the shrink tube processed in the shrink tube processing step to a size of 1 to 300 mm;
A reinforcing pipe extruding step of extruding a reinforcing pipe with a polymer resin selected from a polyolefin resin having high resistance to cracks in stress and impact resistance, a nylon resin, a fluorine resin, a polyacetal resin, and a polyester resin;
A reinforcing pipe cutting step of cutting the reinforcing pipe extruded in the reinforcing pipe extruding step to a size according to the use purpose;
A heating wire manufacturing step of forming an insulated heating wire which integrally extrudes a polymer resin on the outer circumferential surface of the heating wire to form a primary insulating coating layer;
A heating cable manufacturing step of assembling a plurality of heating lines in which a primary insulation coating layer is formed so as to be insulated in the heating line manufacturing step and extruding the heating wires to the outer periphery thereof with a polymer resin to form a heating insulation cable having a secondary insulation protective coating layer;
A heating cable cutting step of cutting the heating cable manufactured in the heating cable manufacturing step to a length corresponding to the purpose of use;
A lead wire constituting step of constituting a lead wire constituting a plug so as to be connected to an outlet at one end to apply power;
The insulating coating of the lead wire obtained in the lead wire forming step is removed and the secondary insulation protective coating layer of the end portion of the heating cable cut by cutting to a length corresponding to the purpose of use in the heating cable cutting step is removed, A lead wire connecting preparation step of peeling off the primary insulating coating layer of the exposed fumed wire to form a lead wire connecting portion;
A part of the end portion of the heating cable and a part of the end of the lead wire connected to the receptacle at one end and configured to apply the power to the plug are replaced with vinyl trimethoxysilane or vinyltriethoxysilane or vinyltris (2-methoxy- ) Silane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, vinyldimethylethoxysilane, and vinylmethyldibutoxysilane may be used alone or in combination of two or more in an amount of 10 to 25 parts by weight An adhesive layer forming step of forming an adhesive layer by coating a reactive silane with a thickness of 0.1 to 10 μm on the outer circumferential surface through a heating oven or a heater box maintained at 50 to 100 ° C. while impregnating the coated reactive silane with a coating bath;
Inserting the shrink tube inserted in the shrink tube cutting step in the shrink tube processing step in the secondary insulation protective coating layer of the heating cable in which the insulating coating layer is removed in the lead wire connection preparation step and the primary insulation coating layer of the heating wire, ;
A reinforcing pipe inserting step of inserting a reinforcing pipe into the lead wire side;
A connection connecting step of integrally connecting and connecting the heating wire and the lead wire of the heating cable into which the shrink tube is inserted and the reinforcing pipe is inserted by welding or clamping with a terminal clip;
The connection connecting portion connecting the heating wire of the heating cable and the wire of the lead wire in the connecting connection step is covered with the shrink tube inserted into the primary insulation coating layer of the heating wire so as to shrink the shrink tube by applying hot air or hot air to the shrink tube. And the shrink tube is integrally tightly bonded to the connecting connection portion so as to insulate the shrink tube;
In the primary shrink tubing insulation step, each heating wire is connected to the electric wire, and the reinforced pipe inserted into the lead wire is transferred to the connecting connection portion so that the portion insulated by the shrink tubing is protected, so that both ends of the reinforcing pipe are connected to the outer surface of the lead wire, Covering the secondary insulation protective coating layer of the connection protection circuit;
The secondary shrink tube prepared by inserting into the heating cable is transferred to cover the reinforcing pipe which is inserted into the inside to protect the connecting connection portion so that both ends cover the secondary insulation protective coating layer of the lead wire and the heating cable, Is shrunk by heating with a hot air or hot gun so that the shrink tube is firmly bonded to the outer surface of the secondary insulation protective coating layer of the lead wire and the reinforcing pipe and the heating cable so as to be hermetically protected. How to protect the heating cable's power connection. delete delete

Images