KR20130039791A

KR20130039791A - Regenerative heating cable

Info

Publication number: KR20130039791A
Application number: KR1020110104362A
Authority: KR
Inventors: 김성민
Original assignee: 김성민
Priority date: 2011-10-13
Filing date: 2011-10-13
Publication date: 2013-04-23

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cable, and more particularly, to a heating cable used for various heating sites such as heat storage heating, road surface heating, and other industrial piping.
To this end, the present invention provides at least one strand of heating wire that generates heat when an electric current is applied, a first coating layer covering the outer circumferential surface of the heating wire and insulated from the outside, and provided to surround the outer circumferential surface of the first covering layer to generate heat generated by the heating wire. And a heat accumulating layer which accumulates and prevents the electromagnetic waves generated when the heat generating line generates heat, and a metal tube formed to surround the heat accumulating layer, wherein the heat accumulating layer includes silicon, an electromagnetic wave shielding material, a heat conductive material, and a heat storage material. It provides a regenerative heating cable consisting of a mixed mixture.
Therefore, according to the present invention, the first coating layer covering the heating wire is coated with the heat storage layer having excellent heat storage function, thermal conductivity and electromagnetic wave shielding, thereby ensuring fast thermal conductivity, improving reliability, and preventing electromagnetic wave exposure.

Description

Regenerative Heating Cable {REGENERATIVE HEATING CABLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage heating cable, and more particularly, to a heat storage heating cable used for various heating sites such as heat storage heating, road surface heating and other industrial piping.

Recently, a heating system using a heating cable has been widely applied to various heating sites such as heat storage heating, road heating, and industrial piping. In the case of a heating system using such a heating cable, there is no need for a separate boiler room, and thus, space utilization is excellent, and environmental pollution, etc. have not been generated at all.

In particular, a heating cable applied to such a heating system has a structure in which a mineral insulator is placed in an outer shape formed of a metal material to have sufficient durability even when used on a road surface, and a heating wire is formed in the insulator.

1 is a view illustrating a mineral insulated copper coated heating cable according to the prior art.

Referring to FIG. 1, a heating cable according to the prior art has been disclosed in US Patent No. 4,998,341 (Inco Alloys Limited), in which at least one conductor rod and one insulator are filled in a tube having a large diameter, and then sealed thereto. After that, it is manufactured by rolling and milling at a high temperature to draw with a relatively thin and thin wire cable.

However, since the heating cable according to the related art uses a mineral such as magnesium oxide (MgO) as the insulator 2, the insulation is destroyed when exposed to moisture, and thus, between the conductor 1 and the conductor 1, or the conductor 1 ) Or short circuit between the copper cladding (3) is not guaranteed stability as a heating cable, but also drawn by rolling and milling at a high temperature, the disadvantage that a special roller and rolling machine is required have.

In addition, as another example of the heating cable according to the prior art, US Patent No. 4,739,155 (Pyrotenax of Canada Ltd.) has the same structure as the heating cable of the mineral insulation method, but in a predetermined block rather than drawing method in the manufacturing process By manufacturing a heating element such as a bus bar having a conductor and a high electrical conductivity using an insulating material, there is a disadvantage that the process is somewhat complicated by manufacturing in a manner of bonding the insulating portion surrounding the heating element.

In addition, US patents, for example, 4,769,529, 4,650,972, 4,392,051, 4,345,368 have been proposed, but this is all heating cable employing mineral insulation as in the prior art described above As a result, there is a risk of dielectric breakdown when exposed to moisture, and it can be pointed out that the manufacturing process is complicated.

In order to complement this, Korean Patent Registration No. 10-273952 has been proposed as shown in FIG. 2.

Referring to Figure 2, the Republic of Korea patent is a glass fiber 20, the insulator that insulates the conductor (1) is safe even when exposed to moisture due to the characteristics of the glass fiber and copper tube (3) The heating cable is proposed to be easier than before.

However, although the copper cladding 3 used in the Korean patent is very excellent in thermal conductivity, the material such as aluminum having low thermal conductivity similar to copper in the manufacturing process and material cost of the heating cable and inexpensive price is also economical according to its utility. It may be considered in terms of phosphorus. However, compared to copper, aluminum is lighter and does not lag significantly in thermal conductivity, but elongation is lower than copper, and the material is soft and breaks well when drawn. There is a problem to overcome this problem because cracks are generated and construction defects in which moisture penetrates.

Accordingly, Korean Patent Registration No. 10-0879371 has been proposed as shown in FIGS. 3 and 4.

As shown in FIG. 3, the Korean patent has a structure in which the conductor is surrounded by the glass fiber 20 and the aluminum alloy coating 30 is surrounded on the conductor. In addition, as shown in FIG. 4, a heating cable using Teflon 20 '(polyfluoroethylene-based resin and fiber brand name developed by DuPont, USA) has been proposed as an insulator.

Korean Patent Registration No. 10-0879371 described above has a specific gravity of 1/3 compared to copper tube by providing aluminum alloy coating, and the unit cost of material is 1/2 level, thus performing the same function as the heating cable made of copper tube. There is an effect that can be reduced, and also because it is not necessary to install a heat treatment process as compared to the coating of the heating cable with the copper tube, it is possible to obtain an effect that can significantly reduce the manufacturing cost.

However, in order to prevent dielectric breakdown, the heating cable compression-drawn with glass fiber in the metal tube is penetrated into the metal tube in a cool place while generating heat, and a short circuit and a short circuit occur as described in Korean Registration No. 10-0879371. As a result, the metal tube may expand and short. In addition, the heating cable insulated by coating the heating wire with a Teflon material is durable in the wet, while vulnerable to thermal resistance, the Teflon supporting the heating wire is contracted, and the heating wire is expanded. As such, when the opposite characteristics are repeatedly generated, a short circuit and a short circuit may occur frequently.

On the other hand, in the prior art, when using a hot water tube heater that seals both ends of a hot water pipe (called an accelerator tube) and fills the heat medium so that there is no space inside the hot water pipe, the hot water is heated by the thermal expansion force of the heat medium to be heated. The problem is that the tube swells and ruptures. In consideration of this, when only two-thirds of the hot water pipes are filled with the heat medium, the 1/3 space of the hot water pipes lacking the heat medium is poorly heated, which causes a problem of deterioration in reliability.

In addition, there is a problem in that the hot wire exposed to the portion where the heat medium is not filled in the hot water pipe has a side effect such as deterioration or disconnection. In this way, when the hot wire is disconnected, the constructed concrete on the indoor floor is dismantled, all hot water pipes piped to a length of several tens of meters are removed, and the hot water pipes are replaced with new ones. This requires a lot of time and money, and the person has to read the living space temporarily to take the inconvenience.

As described above, in consideration of deterioration or disconnection of the hot wire generated from the hot water heater, a heating wire in which the heat absorbing layer of the insulating hot water pipe is laminated is proposed in Korean Utility Model Registration No. 20-0424212.

The utility model registration of the Republic of Korea is a thermal medium absorbing layer made of a material that absorbs and maintains the liquid heat medium on the surface of the insulation coated on the heating wire, so that the heat medium is always absorbed by the heating wire exposed to the outer space of the heat medium in the hot water pipe, The absorbed heat medium prevents the heating wire from deteriorating and maintains the heat radiating function of the hot water pipe.

However, the above-mentioned Korean Utility Model Registration also cannot completely solve the fundamental problem of partial deterioration or disconnection of the heating wire, and there arises a problem that the heating wire flows out of the center of the insulator and flows outward as the heat medium is in the fluid state. It became. In addition, there is a concern that the leakage current is emitted in the process of heating through the heating wire, in particular, there is a concern that harmful electromagnetic waves are exposed to the user's health.

[US Pat. 1] US 4,998,341 B1, Mar. 12, 1991, pp. 2-4 [Document 2] KR 10-0273952 B1, Sep. 06, 2000, pp. 2-3, drawings 1-2 [Document 3] KR 10-0879371 B1, Jan. 12, 2009, pp. 4-9, drawings 1-4 [Document 4] KR 20-0424212 Y1, Aug. 10, 2006, pp. 2-4

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and has the following objectives.

First, it is an object of the present invention to provide a heat storage type heating cable that can improve the durability of the insulator to extend the service life and to ensure fast thermal conductivity to improve reliability.

Second, another object of the present invention is to provide a heat storage heating cable which can reduce the post-heating maintenance cost by preventing partial overheating and thermal expansion rate of the heating cable.

Third, another object of the present invention is to provide a regenerative heating cable capable of preventing leakage current and electromagnetic wave exposure.

According to an aspect of the present invention, at least one strand of heating wire generates heat when an electric current is applied, a first covering layer covering the outer circumferential surface of the heating line and insulated from the outside, and an outer circumferential surface of the first covering layer It is provided so as to accumulate heat generated in the heating line, and the heat storage layer for blocking the spread of the electromagnetic waves generated when the heating line of the heating wire, and a metal pipe formed to surround the heat storage layer, the heat storage layer is silicon The present invention provides a regenerative heating cable composed of a mixture of electromagnetic wave shielding materials, thermal conductive materials, and heat storage materials.

Preferably, the electromagnetic wave shielding material uses at least one selected from carbon, charcoal, or loess, and the thermal conductive material includes at least one selected from copper, aluminum, carbon, nickel, chromium, graphite, or an alloy including any one of them. Any one may be used, and as the heat storage material, at least one selected from carbon, charcoal, mineral, or ceramic may be used.

Preferably, the heat storage heating cable is coated to surround the outer periphery of the heat storage layer, and a second coating layer made of polyethylene, a third coating layer made to cover the outer periphery of the second coating layer and made of aluminum or aluminum alloy; It may further include a fourth coating layer coated to surround the outer periphery of the third coating layer and made of polyethylene.

Preferably, the heat storage layer may be manufactured by a compression molding process, and an opening may be provided at a side surface thereof.

Preferably, the first coating layer is inserted into the heat storage layer through an opening of the heat storage layer with the heating wire inserted therein, and the heat storage layer is inserted with the first coating layer therein. It may be inserted into the metal tube through a drawer.

Preferably, the metal tube may be made of any one selected from copper, aluminum, chromium or nickel.

As described above, according to the present invention, the first coating layer covering the heating wire is coated with a heat storage layer having excellent heat storage function, thermal conductivity and electromagnetic wave shielding, thereby ensuring fast thermal conductivity, improving reliability, and preventing electromagnetic wave exposure. Can be.

Further, according to the present invention, the heat storage layer covering the heating wire is coated with a triple tube made of polyethylene, an aluminum (or aluminum alloy) tube and polyethylene, thereby improving the durability of the heat storage layer inserted into the metal pipe, thereby improving its service life. Can be extended.

In addition, according to the present invention, by treating the heat storage layer covering the heating wire with a triple tube made of polyethylene, an aluminum (or aluminum alloy) tube, and polyethylene, the heating wire is prevented from external damage and short-circuit caused by external force. After-sales maintenance cost can be reduced by preventing partial overheating and thermal expansion rate of the heating wire in the metal pipe (pipe).

In addition, according to the present invention, by forming a plurality of protrusions on the inner peripheral surface of the metal pipe, it is possible to align the heating wire to the central portion of the metal pipe so that the first coating layer coated on the heating wire is always located in the center of the metal pipe. The leakage of the heating wire and the connection with the heating wire or the external terminal of the other heating cable can be facilitated.

In addition, according to the present invention, by using a hydraulic injector to easily inject the heat storage layer into the metal tube to improve the durability of the heating cable, and put the mineral powder into the metal tube and sealed to heat the heating cable by drawing at a high temperature by rolling Compared with the manufacturing method of manufacturing the manufacturing process is simplified, and the use of a special auxiliary device is unnecessary, which can reduce the manufacturing cost.

1 is a view showing a heating cable according to an example of the prior art.
2 illustrates a heating cable according to another example of the prior art.
3 is a view showing a heating cable according to another example of the prior art.
4 shows a heating cable according to another example of the prior art.
5 shows a heating cable according to an embodiment of the invention.
6 illustrates a heating cable according to another embodiment of the present invention.
7 is a perspective view of the heating cable shown in FIG.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms.

In this specification, the embodiments are provided so that the disclosure of the present invention may be completed and the scope of the present invention may be completely provided to those skilled in the art. And the present invention is only defined by the scope of the claims. Thus, in some embodiments, well known components, well known operations, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention.

In addition, like reference numerals refer to like elements throughout the specification. In addition, the terms used (discussed) herein are for the purpose of describing the embodiments are not intended to limit the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. Also, components and acts referred to as " comprising (or comprising) " do not exclude the presence or addition of one or more other components and operations.

In addition, in the drawings, the "heating cable" is shown to be exaggerated in diameter, thickness and width, but this is for the convenience and understanding of the description, the present invention is not limited to this, and that of the heating cable Thickness and width can be varied. That is, the diameter, length, and thickness of the heating wire, the first covering layer, the heat storage layer, and the metal tube constituting the heating cable may be smaller or larger than the size shown.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless they are defined.

Hereinafter, the technical features of the present invention will be described in detail with reference to the accompanying drawings.

5 and 7 are views for explaining a heat storage heating cable according to an embodiment of the present invention, Figure 5 (a) is a perspective view, (b) is shown along the II 'cut line of (a). It is a cross section.

5 and 7, the heating cable according to the embodiment of the present invention includes a heating wire 101, the first covering layer 102, the heat storage layer 103 and the metal tube 104. In addition, although not shown, the heating cable according to the embodiment of the present invention may further include second to fourth covering layers.

The heating line 101 uses a resistive heating element such as a nichrome wire that generates heat when a current is applied. Such a resistor heating element may be selectively used among copper wire, nichrome wire, copper nickel wire, copper chromium wire, and iron chromium wire according to its use, and any metal wire having other conductive components may be used. Here, the heating wire 101 is shown in one strand, but as in the other embodiment shown in FIG. 6, two or three strands or more may be possible. It may be configured to provide a passage that causes the flow of current when the current is applied.

The first covering layer 102 covers the outer circumferential surface of the heating line 101 and insulates it from the outside. That is, the first covering layer 102 is made of an insulator in order to prevent a short circuit between heating lines when the heating line 101 is shorted or two or more strands are present. For example, the first coating layer 102 may be made of any one selected from silicon, polyethylene, glass fiber material, or teflon material.

The glass fiber material is made of fibers by melting an alkali-free glassy material in a platinum furnace and withdrawing from a small hole. Such glass fibers do not have the property of accumulating or absorbing moisture, so there is no fear of insulation breakdown due to moisture, and there is an advantage in that processing is easy. In addition, the mechanical strength is better than that of the existing mineral insulator, which gives higher insulation and reliability, and can maintain a high temperature due to the characteristics of the glass fiber material. The coating method of the glass fiber material is a method of coating the glass fiber on the heating wire surface by repeating the transverse winding and braiding, or arranging the conductor in the woven glass fiber and then wrapping or compressing the fiber fiber in the longitudinal direction.

The heat storage layer 103 surrounds the outer circumferential surface of the first covering layer 102 and accumulates heat generated in the heating line 101, and blocks electromagnetic waves generated when the heating line 101 generates heat. To this end, the heat storage layer 103 is made of a mixture of silicon, electromagnetic wave shielding material, heat conductive material and heat storage material.

Silicon is mixed at 50 to 60 wt% with respect to 100 wt% of the heat storage layer 103, and the remaining 40 to 50 wt% is occupied by the electromagnetic wave shielding material, the thermal conductive material, and the heat storage material. At this time, the electromagnetic wave shielding material may be 10 ~ 20wt%, the thermal conductive material 10 ~ 20wt%, the heat storage material may be mixed 10 ~ 20wt%.

As the electromagnetic wave shielding material, carbon (C) or charcoal including both thermal conductivity and heat storage characteristics may be used, or ocher known to emit anions may be used. At this time, since the carbon (C) is a relatively expensive material, it is preferable to mix it at a relatively low mixing ratio in comparison with other materials in terms of manufacturing cost, and in order to compensate for this, by mixing carbon with charcoal, loess or these together, You can also improve. As the thermal conductive material, any one selected from copper (Cu), aluminum (Al), carbon (C), nickel (Ni), chromium (Cr), or an alloy including any one of them may be used. In addition, the heat storage material may be any one selected from carbon, charcoal, minerals or ceramics.

The metallic pipe 104 is formed to surround the heat storage layer 103, and the metallic pipe 104 may be made of any one metal selected from copper, aluminum, chromium, or nickel.

On the other hand, the heating cable according to the embodiment of the present invention is coated to surround the outer periphery of the heat storage layer 103, the second coating layer made of polyethylene, and is coated to surround the outer periphery of the second coating layer is made of aluminum or aluminum alloy It may further comprise a third coating layer made of, and a fourth coating layer made of polyethylene and covered to surround the outer periphery of the third coating layer.

The second coating layer coats the heat storage layer 103 with polyethylene so as to maintain durability due to strength. The third coating layer is an aluminum tube or aluminum to protect the heating element 101 and the heat storage layer 103 from mechanical, physical and chemical change factors from the outside and to easily transfer heat generated from the heating element. Coating is carried out by an alloy tube (for example, an alloy material containing at least two or more of Si, Mg, Fe, Mn, Cr, Zn, Cu may be used). Like the second coating layer, the fourth coating layer is coated with polyethylene so as to maintain durability due to the strength.

The manufacturing method of the heating cable according to the embodiment of the present invention having such a configuration is made by the following method. First, the heating wire 101 is manufactured, and then the heating wire 101 is first coated with the first coating layer 102. Thereafter, the heat storage layer 103 is manufactured by a compression molding process, and then the first coating layer 102 having the first heating line 101 coated thereon is inserted into the heat storage layer 103. At this time, since the heat storage layer 103 is manufactured in a structure in which one side thereof is opened in the longitudinal direction, the first coating layer 102 is inserted into the inside through the side opening of the heat storage layer 103. Then, the heat storage layer 103 into which the first coating layer 102 is inserted is inserted into the metallic pipe 104 using a drawer and drawn out. At this time, the side opening of the heat storage layer 103 is sealed by a drawer, and the air layer existing therein is also removed in the process of drawing, so that no leakage occurs at this site.

On the other hand, the joint connection portion to which the power cable (not shown) is connected to supply the current to the heating element 101 according to the present invention is an insulator made of an insulating material such as silicon so as to prevent the short circuit is not exposed to moisture It can be coated with.

6 is a view illustrating a heating cable according to another embodiment of the present invention. FIG. 6A is a perspective view, and FIG. 6B is a cross-sectional view taken along the line II ′ of FIG.

Referring to FIG. 6, the heating cable according to another embodiment of the present invention has a structure similar to the heating cable according to the embodiment shown in FIG. 5. However, the heating lines 101 'and 101''are composed of two strands, and the first covering layers 102' and 102 '' covering the heating lines 101 'and 101''are formed. Since other configurations are the same as those of FIG. 5, description thereof will be omitted.

As described above, although the technical idea of the present invention has been described in detail in the preferred embodiments, the above-described preferred embodiments are for the purpose of description and not of limitation. For example, in FIG. 6, the first coating layer of two strands having a heating wire inserted therein is inserted into the heat storage layer in a direction parallel to each other. It may be inserted. As such, a person of ordinary skill in the art may realize the present invention within the scope of the technical idea of the present invention.

101, 101 ', 101'': heating wire
102, 102 ', 102'': first coating layer
103: heat storage layer
104: metal pipe

Claims

At least one strand of heating wire that generates heat when an electric current is applied;
A first covering layer covering an outer circumferential surface of the heating wire and insulated from the outside;
A heat storage layer provided to surround an outer circumferential surface of the first coating layer to accumulate heat generated by the heating line, and to prevent electromagnetic waves generated when the heating line generates heat; And
It includes a metal pipe formed to surround the heat storage layer,
The heat storage layer is a heat storage heating cable made of a mixture of silicon, electromagnetic wave shielding material, heat conductive material and heat storage material.

The method of claim 1,
At least one selected from carbon, charcoal, or loess may be used as the electromagnetic wave shielding material, and at least one selected from copper, aluminum, carbon, nickel, chromium, graphite, or an alloy including any one thereof may be used. And a heat storage material using at least one selected from carbon, charcoal, mineral, and ceramic as the heat storage material.

The method of claim 1,
A second coating layer coated to surround the outer periphery of the heat storage layer and made of polyethylene;
A third coating layer coated to surround an outer circumference of the second coating layer and made of aluminum or an aluminum alloy; And
A fourth covering layer made of polyethylene and covering the outer periphery of the third covering layer
Regenerative heating cable further comprising a.

The method of claim 1,
The heat storage layer is manufactured by a compression molding process, the heat storage heating cable is provided with an opening on the side.

The method of claim 4, wherein
The first coating layer is inserted into the heat storage layer through the opening of the heat storage layer with the heating wire inserted therein, and the heat storage layer is inserted through the drawer with the first coating layer inserted therein. Regenerative heating cable inserted into the metal pipe.

6. The method according to any one of claims 1 to 5,
The metal pipe is a heat storage heating cable made of any one selected from copper, aluminum, chromium or nickel.