CN112351531B - A combined self-limiting temperature electric heating cable - Google Patents

Abstract

The invention relates to a combined self-temperature-limiting electric tracing band, which belongs to the technical field of electric tracing band products and comprises a tracing band body, wherein the tracing band body comprises a plurality of core wires arranged along the width direction, the length direction of the core wires is parallel to the length direction of the tracing band body, and the outer side of the core wires is wrapped with an external insulating layer; a shielding layer is arranged on the outer side of the external insulating layer, and a protective layer is arranged on the outer side of the shielding layer; the core wire comprises two copper core buses arranged inside and a PCT heating layer positioned outside the copper core buses, and an internal insulating layer is wrapped outside the PCT heating layer; and the outer side of the internal insulating layer is wrapped with a pressure-resistant layer. By adopting the technical scheme, the electric tracing band can be protected, and meanwhile, the heat tracing effect is enhanced.

Description

A combined self-limiting temperature electric heating cable

technical field

The invention belongs to the technical field of electric tracing belt products, and in particular relates to a combined self-limiting temperature electric tracing belt.

Background technique

Electric heating cables are widely used in the transportation of liquid objects in pipelines and the antifreeze and heat preservation of tanks, maintaining process temperature, heating roads, ramps, pedestrian crossings, eaves and floors, etc. Among them, inside the basic self-limiting electric heating cable, the PTC polymer material for heating is distributed between the two conductive cores, and the exterior is composed of a polymer insulating layer. When the power is turned on, the internal PTC polymer material expands due to heat, the resistance becomes larger, the heating power is reduced, and the temperature is lowered; when the temperature decreases, the internal PTC polymer material shrinks when cooled, the resistance becomes smaller, and the heating power increases. Make the temperature rise, so as to achieve the function of automatic temperature adjustment. When the electric heating cable is working and a system is traced, if the heat transferred by the electric heating cable to the system per unit time is equal to the heat transferred by the system to the external environment, the temperature of the system will remain unchanged. The highest temperature that the system can reach is called the maximum maintenance temperature.

During the use of the electric tracing tape in the prior art, the electric tracing belt is operated to wrap it on the outside of the pipeline. During the use, the electric tracing belt is easily hit by foreign objects, which reduces its heat tracing effect.

SUMMARY OF THE INVENTION

In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a combined self-limiting temperature electric heating cable, which can protect the electric heating cable and at the same time, strengthen its heating effect.

In order to realize the above-mentioned purpose of the invention, a technical scheme provided by the present invention is as follows:

A combined self-limiting temperature electric heating cable includes a heating cable body, the heating cable body includes a plurality of core wires arranged along the width direction, and the length direction of the core wires is parallel to the length direction of the heating cable body. The outer side of the wire is wrapped with an outer insulating layer; the outer side of the outer insulating layer is provided with a shielding layer, and the outer side of the shielding layer is provided with a protective layer; the core wire includes two copper core busbars arranged inside, located on the copper core busbar The outer side of the PCT heating layer, the outer side of the PCT heating layer is wrapped with an inner insulating layer; the outer side of the inner insulating layer is wrapped with a compression layer.

Preferably, one side of the plane formed by a plurality of the core wires is a heating surface, and the other side is a thermal insulation surface, and the pressure-resistant layer includes a heat conduction plane on a side close to the heating surface, and a cross-sectional shape of a side surface close to the thermal insulation surface. It is an arc-shaped compression-resistant arc surface, and the compression-resistant layer is made of compression-resistant material.

Preferably, the outer insulating layer includes a first insulating layer wrapping the core wire and a second insulating layer attached to the shielding layer, and a thermal insulation layer is provided between the first insulating layer and the second insulating layer The thermal insulation layer and the thermal conduction layer are located on both sides of the core wire, the thermal insulation layer is located on the side close to the thermal insulation surface, and the thermal conduction layer is located on the side close to the heating surface.

Preferably, two sides of the heating cable body along the width direction are provided with a splicing structure, and two adjacent circles of the heating cable body can be spliced through the splicing structure when they are wound.

Preferably, the splicing structure comprises an arc-shaped protrusion on one side of the heating cable body in the width direction and an arc-shaped groove on the other side in the width direction, and the arc-shaped protrusions and arc-shaped grooves of two adjacent circles of the heating cable are Can be mated to each other.

Preferably, a heat-conducting wire is arranged in the first insulating layer, and the heat-conducting wire is annular and connects the heat-conducting layer and the thermal insulation layer.

Preferably, a first decorative layer is provided on the outer side of the protective layer and on the side close to the heat conducting layer, and a second decorative layer is provided on the side close to the thermal insulation layer.

Preferably, the outer insulating layer and/or the inner insulating layer are made of composite fluoroplastics.

The combined self-limiting temperature electric heating cable provided by the present invention can protect the core wire from compression to a certain extent through the compression layer arranged on the outside of the core wire. The thermal insulation layer and the heat conduction layer between the two insulating layers can not only strengthen the heat exchange with the pipeline to be insulated, but also can carry out thermal insulation treatment on the electric heating cable to reduce its heat loss. At the same time, through the provided splicing structure, the electric heating cable can be spliced to the outside of the pipeline to be insulated, and then an electric heating protection film is formed on the outside to heat and protect the thermal insulation pipeline.

Description of drawings

Fig. 1 is a sectional view of a combined self-limiting temperature electric heating cable of the present invention;

2 is a sectional view of a protruding centerline in a combined self-limiting temperature electric heating cable of the present invention;

3 is a schematic diagram of a protruding splicing structure in a combined self-limiting temperature electric heating cable according to the present invention.

Reference numbers in the figure:

100, core wire; 110, copper core bus bar; 120, PCT heating layer; 130, internal insulating layer; 140, compression layer; 141, heat conduction plane; 142, compression arc surface; 150, heating surface; 160, insulation surface ; 200, outer insulating layer; 210, first insulating layer; 220, second insulating layer; 300, shielding layer; 400, protective layer; 500, thermal insulation layer; 600, heat conducting layer; 610, heat conducting wire; 710, the arc-shaped protrusion; 720, the arc-shaped groove; 800, the first decorative layer; 900, the second decorative layer.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example

The present invention provides a combined self-limiting electric heating cable, referring to Fig. 1-Fig. 3, comprising a heating cable body, the heating cable body includes a plurality of core wires 100 spaced along the width direction of the heating cable body, and the length direction of the core wires 100 is Parallel to the length direction of the heating cable body, the core wire 100 is energized and heated during use, and an outer insulating layer 200 is wrapped on the outside of the core wire 100; During use, the core wire 100 is electrified to generate heat, and the heat exchanges heat with the pipe to be insulated after passing through the outer insulating layer 200 , the shielding layer 300 and the protective layer 400 . It should be noted that the width direction refers to the cross section along the length of the vertical heating cable, the longer side is the width direction, and the shorter side is the thickness direction.

The core wire 100 includes two copper core busbars 110 arranged inside, a PCT heating layer 120 located outside the copper core busbar 110, an inner insulating layer 130 wrapped on the outside of the PCT heating layer 120, and a compression layer 140 wrapped on the outside of the inner insulating layer 130. . By providing the anti-compression layer 140, it can be ensured that the internal PCT heating layer 120 and the copper core bus bar 110 are not damaged during use.

Specifically, a plurality of core wires 100 form a plane, and one side of the formed plane is a heating surface 150, and the other side is a heat preservation surface 160, wherein, in use, the heating surface 150 is a side close to the pipeline, and the heat preservation surface 160 for the side away from the pipe. The heating surface 150 is used to exchange heat with the pipes, and the insulating surface 160 isolates the heat generated by the core wire 100 and isolates the low temperature outside.

The compressive layer 140 wraps the PCT heating layer 120 , and includes a thermally conductive plane 141 close to the heating surface 150 and a compressive arc surface 142 close to one side of the heat preservation surface 160 . The heat-conducting plane 141 is a horizontal plane, the cross-section of the compression-resistant arc surface 142 is an arc-shaped cross-section, and the compression-resistant layer 140 is made of a compression-resistant material. During use, when being squeezed by an external force, since the compressive arc surface 142 has an arc-shaped cross-section, the squeezing strength to the inside of the core wire 100 can be reduced to a certain extent, so as to ensure a good internal structure of the core wire 100 .

Further, during use, in order to further enhance the effect of heat tracing and heat preservation, the outer insulating layer 200 includes a first insulating layer 210 that wraps the core wire 100 and a second insulating layer 220 that is attached to the shielding layer 300 . 210 and the second insulating layer 220 are provided with a thermal insulation layer 500 and a thermally conductive layer 600. The thermal insulation layer 500 and the thermally conductive layer 600 are located on both sides of the core wire 100, and the thermal insulation layer 500 is located on the side close to the thermal insulation surface 160. Close to the heating surface 150 side. During use, the thermal insulation layer 500 can reduce the heat exchange between the outside low temperature and the heating cable, and the heat conduction layer 600 can strengthen the heat exchange with the pipeline to be thermally insulated, thereby improving the thermal insulation and heat exchange effect.

Preferably, a heat conducting wire 610 is provided in the first insulating layer 210 , and the heat conducting wire 610 is annular and connects the heat conducting layer 600 and the heat insulating layer 500 . The thermal wire 610 provided can balance the temperature on both sides of the thermal insulation layer 500 and the thermal conduction layer 600 during use, thereby improving the utilization rate of the temperature generated by the electric heating cable and better maintaining the thermal insulation pipeline.

In areas with relatively low temperature, after the heating cable is wound on the outside, the temperature of the pipeline is still relatively low. In order to better improve the temperature effect, splicing structures 700 are provided on both sides of the heating cable body along the width direction. Two loops of the heating cable body can be spliced by the splicing structure 700 when they are wound.

Specifically, the splicing structure 700 includes an arc-shaped protrusion 710 located on one side of the heating cable body in the width direction and an arc-shaped groove 720 located on the other side in the width direction. 720 can be fitted into each other. The provided splicing structure 700 can be wound on the outside of the pipeline as a whole during use, thereby isolating the pipeline from the outside low-temperature air, and at the same time, it cooperates with the thermal insulation layer 500 and the heat conduction layer 600 of the electric heating cable to better achieve the effect of thermal insulation. . The pipeline has better antifreeze effect in low temperature environment.

A first decoration layer 800 is provided on the outer side of the protective layer 400 and on the side close to the heat conduction layer 600 , and a second decoration layer 900 is provided on the side close to the thermal insulation layer 500 . Wherein, the first decorative layer 800 and the second decorative layer 900 are different decorative layers, on which a prompt slogan can be set to facilitate construction.

The outer insulating layer 200 and/or the inner insulating layer 130 are made of composite fluoroplastic.

The combined self-limiting temperature electric heating cable provided by the present invention can protect the core wire 100 against compression to a certain extent through the compression layer 140 arranged on the outer side of the core wire 100. The thermal insulation layer 500 and the heat conduction layer 600 between the layer 210 and the second insulating layer 220 can not only strengthen the heat exchange with the pipeline to be insulated, but also can perform thermal insulation treatment on the electric heating cable to reduce its heat loss. At the same time, through the provided splicing structure, the electric heating cable can be spliced to the outside of the pipeline to be insulated, and then an electric heating protection film is formed on the outside to heat and protect the thermal insulation pipeline.

The above-mentioned embodiments only represent the embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (6)

1. A combined self-limiting temperature electric heating cable, comprising a heating cable body, characterized in that: the heating cable body includes a plurality of core wires (100) arranged along the width direction, and the length direction of the core wires (100) is parallel to the length direction. In the length direction of the heating cable body, an outer insulating layer (200) is wrapped on the outside of the core wire (100); a shielding layer (300) is provided outside the outer insulating layer (200), and the shielding layer (300) The outer side is provided with a protective layer (400); The core wire (100) includes two copper core busbars (110) arranged inside, a PCT heating layer (120) located outside the copper core busbar (110), and the PCT heating layer (120) outside is wrapped with a PCT heating layer (120). an inner insulating layer (130); an outer side of the inner insulating layer (130) is wrapped with a compression-resistant layer (140); One side of the plane formed by the plurality of said core wires (100) is a heating surface (150), and the other side is a heat preservation surface (160). a plane (141) and a pressure-resistant arc surface (142) with an arc-shaped cross-sectional shape of a side surface close to the thermal insulation surface (160), and the pressure-resistant layer (140) is made of a pressure-resistant material; The outer insulating layer (200) includes a first insulating layer (210) wrapping the core wire (100) and a second insulating layer (220) attached to the shielding layer (300). An insulating layer (500) and a heat conducting layer (600) are arranged between the insulating layer (210) and the second insulating layer (220), and the insulating layer (500) and the heat conducting layer (600) are located on the core wire (100) The thermal insulation layer (500) is located on the side close to the thermal insulation surface (160), and the thermally conductive layer (600) is located on the side close to the heating surface (150). 2. A combined self-limiting temperature electric heating cable according to claim 1, characterized in that: the two sides of the heating cable body along the width direction are provided with a splicing structure (700), and two adjacent rings of the heating cable are provided with a splicing structure (700). When the body is wound, it can be spliced by the splicing structure (700). 3. A combined self-limiting temperature electric heating cable according to claim 2, characterized in that: the splicing structure (700) comprises an arc-shaped protrusion (710) located on one side of the heating cable body in the width direction and a In the arc-shaped groove (720) located on the other side in the width direction, the arc-shaped protrusions (710) and arc-shaped grooves (720) of two adjacent circles of heating cables can be fitted with each other. 4. A combined self-limiting temperature electric heating cable according to claim 1, characterized in that: a heat conducting wire (610) is arranged in the first insulating layer (210), and the heat conducting wire (610) is in the shape of a heat conducting wire (610). ring, and connect the heat conduction layer (600) and the thermal insulation layer (500). 5. A combined self-limiting temperature electric heating cable according to claim 1, characterized in that: a first decorative layer ( 800), and a second decorative layer (900) is provided on the side close to the thermal insulation layer (500). 6 . The combined self-limiting temperature electric heating cable according to claim 1 , wherein the outer insulating layer ( 200 ) and/or the inner insulating layer ( 130 ) are made of composite fluoroplastics. 7 .

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