CN218006550U

CN218006550U - Plane type self-temperature-control heat tracing cable

Info

Publication number: CN218006550U
Application number: CN202222158636.1U
Authority: CN
Inventors: 王勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-12-09
Anticipated expiration: 2032-08-16

Abstract

The utility model discloses a plane self control temperature companion heating cable, including PTC core area and cladding at the insulating layer in this PTC core area, PTC core area includes that PTC generates heat the layer, and PTC generates heat and is provided with the metal electrode foil layer between layer and the insulating layer, and the metal electrode foil layer includes along the last metal electrode foil and the lower metal electrode foil of length direction clearance formula parallel extension, goes up the positive negative pole electric conductance that metal electrode foil, lower metal electrode foil were power respectively and leads to. The utility model discloses a plane self control temperature companion heating cable has the width and sets up characteristics nimble, that the structure suitability is strong.

Description

Plane type self-temperature-control heat tracing cable

Technical field l

The utility model relates to a heat tracing cable technical field specifically indicates a plane self control temperature heat tracing cable.

Background

The heat tracing cable is widely applied to the process pipeline anti-freezing and blockage relieving of industrial enterprises such as petroleum, chemical engineering, steel, electric power and the like, the heat tracing and heat preservation of an oil tank or a storage tank, the anti-freezing, anti-freezing/environment-friendly, the petroleum, electric power, steel, chemical engineering, coal gas, freezing, water supply and drainage, fire fighting, electric heating and geothermal cultivation, offshore oil platforms, coal gas layer exploitation, thermal oil extraction, oil refineries, and large-scale engineering projects of water, gas and oil. Meanwhile, the solar energy heat-preserving device can be applied to anti-freezing, snow-melting, heating and heat-tracing heat-preserving projects of residents in multiple industries in various occasions, solar energy matching and the like.

The PTC high polymer material plays a core role in the self-temperature-control heat tracing cable and is basically characterized in that the resistivity of the PTC high polymer material increases along with the rise of the temperature within a certain temperature range; particularly, the resistivity is abruptly changed by about 100 ten thousand times in a small temperature change range around the critical temperature.

The PTC thermosensitive material is generally a sintered product or a semi-crystalline polymer composite filled with conductive particles. Crystalline or semi-crystalline polymers include polyethylene, polypropylene, polyvinylidene fluoride, polychlorotrifluoroethylene, and copolymers thereof. The conductive particles include carbon black, graphite, carbon fiber and metal powder, wherein the metal powder includes silver powder, copper powder, aluminum powder, nickel powder, stainless steel powder and the like.

In operation, a polymer PTC thermistor device obtains positive resistance temperature characteristics by changing its conductivity through thermal expansion, making it difficult for current to flow, and generally 2 electrodes are respectively led out at 2 different locations of a conductive member made of a conductive polymer. A conductive polymer, which is one of the materials of the conductive member, for example, polyethylene or a fluorine-based resin, is kneaded with carbon black and then crosslinked by irradiation of high-energy rays to form a conductive polymer. In the conductive polymer, carbon black particles are connected with each other in a normal temperature environment, so that good conductivity is formed. However, when the external environmental temperature rises, the conductive polymer thermally and physically expands, and at this time, the distance between carbon black particles increases, and the conductive path is interrupted, so that the resistance value rapidly increases.

When PTC materials are used as heat generating elements, such conductors exhibit lower electrical resistivity at lower temperatures. When the temperature is increased to be higher than the melting point of the high molecular polymer, namely the temperature is turned off, the resistivity is sharply increased, and the power of the heating element is sharply reduced, so that the further increase of the element temperature is limited, and the effect of automatically controlling the temperature is achieved.

The structure of the heat tracing cable in the prior art is shown in fig. 1, two parallel conductive wire cores are generally used as copper core bus pairs 11 and are arranged on two sides of a PTC heating layer 12 as electrodes, and an insulating layer 13, a shielding layer 14 and an outer sheath layer 15 are sequentially coated outside the PTC heating layer 12. As the width of the cable increases, the spacing between the two electrodes also increases, and thus the resistance of the cable also increases, which results in a reduction in the heating power. Therefore, the structure limits the width of the heat tracing cable and brings certain limitation to application.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a plane self control temperature companion heating cable has the width and sets up the characteristics nimble and that the structural suitability is strong.

The utility model discloses can realize through following technical scheme:

the utility model discloses a plane self control temperature accompanies hot cable, including PTC core area and cladding at the insulating layer in this PTC core area, PTC core area includes that PTC generates heat the layer, and PTC generates heat and is provided with the metal electrode foil layer between layer and the insulating layer, and the metal electrode foil layer includes along the parallel last metal electrode paper tinsel and the lower metal electrode paper tinsel that extends of length direction clearance formula, goes up the metal electrode paper tinsel, lower metal electrode paper tinsel respectively with adjacent copper core generating line electric conductance expert.

Furthermore, the outer side of the PTC heating layer is provided with a copper core bus pair, the copper core bus pair comprises two copper core buses which are arranged at intervals, the copper core buses are separated at the outer side of the PTC heating layer and have a certain gap with the PTC heating layer, and the upper metal electrode foil and the lower metal electrode foil are electrically connected with the adjacent copper core buses through welding points in a welding manner.

Furthermore, the base material of the metal electrode foil layer is a metal foil or an alloy foil, the volume resistivity of the metal electrode foil layer is less than 10 [ mu ] omega/cm, and the thermal conductivity is more than 100W/(m.K).

Furthermore, the base material of the metal electrode foil layer is copper foil, the copper foil is electrolytic copper foil or rolled copper foil, and the thickness of the copper foil is 8-80 μm.

Furthermore, the copper foil is a single-sided rough copper foil or a double-sided rough copper foil, and a nickel plating layer is plated on the roughened surface of the copper foil.

Furthermore, the metal electrode foil layer is in a continuous belt shape or a discontinuous belt shape, and a plurality of gaps are uniformly or non-uniformly arranged at intervals in the length direction of the metal electrode foil layer in the discontinuous belt shape.

Further, the width of the metal electrode foil layer is 2mm-800mm.

Furthermore, the copper-core bus is a tinned copper wire or a nickel-plated copper wire, the copper-core bus is a stranded wire, and the cross section of the copper-core bus is circular or flat belt-shaped.

Furthermore, the outside of insulating layer is wrapped in proper order and is shielded layer and oversheath layer.

The utility model relates to a plane self control temperature companion heat cable has following beneficial effect:

the width is flexibly set, and in the utility model, the metal electrode foil layer is arranged and used as an electrode of the PTC heating layer, so that the metal electrode foil layer has the width flexibility, and the defect that the distance between two electrodes is increased when the width of a cable is increased in the prior art is overcome;

second, structural suitability is strong, the utility model discloses structurally only increase the metal electrode foil layer with regard to original structure between PTC heating layer and insulating layer and can realize, only need carry out simple improvement at original mechanism and can realize, satisfy current heat tracing cable's automatic control temperature needs.

Drawings

FIG. 1 is a schematic structural view of a conventional self-temperature-controlled electric heating cable;

FIG. 2 is a schematic structural view of the self-regulating temperature heat tracing cable of the present invention;

fig. 3 is a schematic structural view of a metal electrode foil layer according to the present invention;

FIG. 4 is a schematic view of the connection relationship between the metal electrode foil layer and the copper core bus pair of the present invention;

FIG. 5 is a schematic view of another embodiment of the connection relationship between the metal electrode foil layer and the copper core busbar pair according to the present invention;

FIG. 6 is a schematic structural view of another embodiment of the self-regulating temperature heat tracing cable of the present invention;

FIG. 7 isbase:Sub>A cross-sectional view A-A of FIG. 6;

reference numbers in the drawings: 11. a copper core bus pair; 12. a PTC heating layer; 13. an insulating layer; 14. a shielding layer; 15. an outer jacket layer; 21. a metal electrode foil layer; 31. a welding point; 32. and (4) notches. .

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following provides a detailed description of the product of the present invention with reference to the embodiments and the accompanying drawings.

Example 1

Referring to fig. 2, a planar self-temperature-control heat tracing cable includes a PTC heating layer 12, and metal electrode foil layers 21 attached to upper and lower surfaces of the PTC heating layer 12.

As shown in fig. 3, the metal electrode foil layer is a complete continuous strip-shaped nickel-plated copper foil with the thickness of 22um and the width of 2mm-80 mm; the metal electrode foil layer is wrapped with an insulating layer 13; the insulating layer 13 is wrapped by a shielding layer 14. An outer sheath layer 15 is arranged outside the shielding layer 14.

In this embodiment, the metal electrode foil layer is connected to the positive electrode and the negative electrode of the power supply in an external electrical conduction manner.

As can be seen from fig. 2, the PTC heating layer is electrically conducted by the metal electrode foil layer, and the PTC heating layer can be externally connected without limitation that a through-core bus bar needs to be filled in the PTC heating layer for conduction, so that the PTC heating layer is more flexible in structural design, and the limitation of the width by the copper-core bus bar in the prior art is effectively avoided; in addition, in the position, the metal electrode foil layer is a thin layer positioned on the insulating layer and the PTC heating layer, so that the thickness or the width of the cable cannot be increased, and the influence of the excessive thickness of the cable on the subsequent construction links is avoided; and the metal electrode foil layer extends along the length direction, so that the heating uniformity of the PTC heating layer is ensured, and the action sensitivity is ensured.

Example 2

The structure of the self-temperature-control heat tracing cable is the same as that of the embodiment 1, and the difference is that the PTC heating layer is internally coated with a copper core bus pair 11.

As shown in fig. 4, the copper core bus bar on one side of the copper core bus bar pair 11 is shown. In fig. 4, the copper core bus bar is electrically connected to the metal electrode foil layer 21 in a spaced manner by welding via a welding point 31.

In fig. 4, the copper core bus bar pair is filled in the PTC heating layer, the structure has better universality with the prior art, the improvement of the cable is realized by only arranging the metal electrode foil layer between the PTC heating layer and the insulating layer, and the width of the metal electrode foil layer is fully utilized to ensure the flexibility, the heating uniformity and the higher applicability of the structure.

Example 3

The structure of the self-temperature-controlling heat tracing cable is the same as that of embodiment 2, but the metal electrode foil layer 21 is provided with electrode notches 32 at certain intervals, as shown in fig. 5. The electrode gap 32 may extend through the entire metal electrode foil.

Example 4

The self temperature-controlling heat tracing cable has the same structure as that of embodiment 4, and the metal electrode foils of the self temperature-controlling heat tracing cable have the structure shown in fig. 5, but the two upper and lower metal electrode foils 21 are offset to both sides by a certain distance in the width direction, as shown in fig. 6. The cross-section a of the heat trace cable of fig. 6 is configured as shown in fig. 7.

As can be seen from fig. 7, two copper core bus bars of the copper core bus bar pair 11 are respectively located at the left and right sides of the PTC heating layer 12, the metal electrode foil layer 21 is respectively located at the upper and lower sides of the PTC heating layer 12, the right copper core bus bar is electrically conducted with the upper PTC heating layer, and the left copper core bus bar is electrically conducted with the bottom PTC heating layer, so as to form a flat structure. And then the insulating layer 13, the shielding layer 14 and the outer sheath layer 15 are coated on the outer side in sequence.

It should be noted that, in the present invention, the specific requirements of the different parts described in the above embodiments are as follows:

the PTC heating layer comprises at least one crystalline polymer material and at least one conductive filler dispersed in the crystalline polymer material, wherein the volume resistivity of the conductive filler is lower than 200 mu omega/cm, the particle size is 0.1 mu m to 30 mu m, and the D50 is not more than 20 mu m.

The copper core bus can be a tinned copper wire or a nickel-plated copper wire, specifically can be a stranded wire, and can be round or flat belt-shaped.

The metal electrode foil layer comprises at least one metal electrode foil. In shape, the metal electrode foil layer can be a complete strip shape; or some patterns such as holes, gaps and the like are regularly distributed along the length direction; or may be completely cut at regular intervals. The shapes of the upper and lower surface electrode foils may be uniform or non-uniform. The base material of the metal electrode foil layer is a metal foil or an alloy foil, the volume resistivity of the metal foil is lower than 10 mu omega/cm, and the thermal conductivity of the metal foil is not lower than 100W/(m.K). The base material of the metal electrode foil layer is electrolytic copper foil or rolled copper foil, and the thickness of the copper foil is 8.0-80 μm. The metal electrode foil layer is single-sided wool or double-sided wool and is attached to the PTC heating layer through the roughened surface. For effective bonding, the roughened surface bonded to the PTC heating layer is plated with a nickel plating layer. The width of the metal electrode foil layer can be freely adjusted in thickness, and is generally from 2mm to 800mm; more preferably 5mm to 400mm; more preferably 6mm to 300mm; more preferably 6mm to 200mm.

In the description of the present invention, it is to be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, numerous variations and modifications can be made without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.

Claims

1. The utility model provides a plane self control temperature companion heating cable, includes PTC core area and the insulating layer of cladding in this PTC core area, PTC core area includes PTC heating layer, its characterized in that: the PTC heater is characterized in that a metal electrode foil layer is arranged between the PTC heating layer and the insulating layer, the metal electrode foil layer comprises an upper metal electrode foil and a lower metal electrode foil which are in clearance type parallel extension along the length direction, and the upper metal electrode foil and the lower metal electrode foil are respectively in electric conduction with the positive electrode and the negative electrode of a power supply.

2. The planar type self-controlling temperature heat tracing cable of claim 1, wherein: PTC generates heat the layer outside and is equipped with copper core bus pair, copper core bus is to two copper core buses that set up including the interval, copper core bus branch is in the PTC generates heat the layer outside and has certain clearance with PTC generates heat the layer, go up metal electrode foil, lower metal electrode foil and adjacent copper core bus and pass through welding point welding electric conductance.

3. The planar self-controlling temperature heat tracing cable according to claim 1, wherein: the base material of the metal electrode foil layer is a metal foil or an alloy foil, the volume resistivity of the metal electrode foil layer is less than 10 mu omega/cm, and the thermal conductivity is more than 100W/(m.K).

4. The planar self-controlling temperature heat tracing cable according to claim 1, wherein: the base material of the metal electrode foil layer is copper foil, the copper foil is electrolytic copper foil or rolled copper foil, and the thickness of the copper foil is 8-80 mu m.

5. The planar self-controlling temperature heat tracing cable of claim 4, wherein: the copper foil is a single-sided rough copper foil or a double-sided rough copper foil, and a nickel plating layer is plated on the roughened surface of the copper foil.

6. The planar type self-controlling temperature heat tracing cable of claim 1, wherein: the metal electrode foil layer is in a continuous belt shape or a discontinuous belt shape, and a plurality of gaps are uniformly or non-uniformly arranged on the discontinuous belt-shaped metal electrode foil layer in the length direction at intervals.

7. The planar self-controlling temperature heat tracing cable according to claim 1, wherein: the width of the metal electrode foil layer is 2mm-800mm.

8. The planar type self-controlling temperature heat tracing cable of claim 2, wherein: the copper core bus is a tinned copper wire or a nickel-plated copper wire, the copper core bus is a stranded wire, and the cross section of the copper core bus is circular or flat belt-shaped.

9. The planar type self-controlling temperature heat tracing cable of claim 1, wherein: the outside of insulating layer cladding has shielding layer and oversheath layer in proper order.