CN108601124B - Electric heating wire and electric heating device - Google Patents
Electric heating wire and electric heating device Download PDFInfo
- Publication number
- CN108601124B CN108601124B CN201810420661.8A CN201810420661A CN108601124B CN 108601124 B CN108601124 B CN 108601124B CN 201810420661 A CN201810420661 A CN 201810420661A CN 108601124 B CN108601124 B CN 108601124B
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- Prior art keywords
- electric heating
- heating wire
- elastic insulating
- layer
- insulating layer
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- 238000005485 electric heating Methods 0.000 title claims abstract description 50
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- 239000004965 Silica aerogel Substances 0.000 description 1
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- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 description 1
- NJWNEWQMQCGRDO-UHFFFAOYSA-N indium zinc Chemical compound [Zn].[In] NJWNEWQMQCGRDO-UHFFFAOYSA-N 0.000 description 1
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- 229910052749 magnesium Inorganic materials 0.000 description 1
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000002082 metal nanoparticle Substances 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
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- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
- H05B2206/023—Induction heating using the curie point of the material in which heating current is being generated to control the heating temperature
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Resistance Heating (AREA)
Abstract
The invention discloses an electric heating wire and an electric heating device, wherein the electric heating wire comprises a wire body, and the wire body comprises: a magnetic core; an elastic insulator coating the magnetic core; wherein, the layer body of the elastic insulator is internally provided with a pipeline which surrounds the magnetic core in a spiral shape; and liquid phase metal poured into the pipeline. According to the invention, through the electromagnetic heating structure in the wire rod, the electric heating efficiency of the electric heating wire is improved; in addition, the electric heating wire is prepared by liquid phase metal and an elastic insulator, so that the electric heating wire has tensile property and can meet the use/installation requirements of different sizes and lengths.
Description
Technical Field
The invention belongs to the technical field of electromagnetic heating, and particularly relates to an electric heating wire and an electric heating device.
Background
The heating wire is also called a heating wire, and is a wire which heats by utilizing the thermal effect of current after being electrified. There are many types, known in basic physics as resistive wires, resistive filaments. According to the conductor, there are mainly nickel-chromium alloy wire, constantan wire, carbon fiber, etc. The insulators are classified into silica gel, pvc, teflon, glass fiber, etc.
The prior multi-layer structure of the electric heating wire mainly comprises internal glass fibers and external insulating silica gel, wherein the resistance wire is wound on the glass fibers, the resistance wire is electrically isolated from the outside through the insulating silica gel, and heat energy generated by the resistance wire is transferred to the outside of the electric heating wire through the insulating silica gel.
The electric heating wire adopts a traditional resistance heating mode, so that the electric heating efficiency is low; in addition, although the electric heating wire can be bent to a certain extent, the structure stretching in the length direction cannot be realized, and when the actual required length is longer than the length of the electric heating wire, the electric heating wire cannot meet the requirement of a user; when the actual required length is smaller than the length of the electric heating wire, the more wires are poor in overall aesthetic feeling or placed without space.
Disclosure of Invention
Accordingly, an objective of the present invention is to provide an electric heating wire to solve the problem of low electric heating efficiency of the electric heating wire in the prior art.
In some illustrative embodiments, the heater wire comprises a wire body comprising: a magnetic core; an elastic insulator coating the magnetic core; wherein, the layer body of the elastic insulator is internally provided with a pipeline which surrounds the magnetic core in a spiral shape; and liquid phase metal poured into the pipeline.
In some alternative embodiments, the elastic insulator is of at least two-layer structure, and the layers are mutually adhered; the pipeline is formed by matching layers which are mutually attached.
In some alternative embodiments, at least one layer of the at least two layers of the resilient insulator is present to isolate the magnetic core from the liquid phase metal.
In some alternative embodiments, at least one interlayer structure located in an outer layer of the liquid phase metal of at least two layers of the elastic insulator is provided with a shielding coating.
In some alternative embodiments, the heater wire further comprises: two connector lugs positioned at two ends of the wire body; the two connector lugs are respectively and electrically connected with liquid phase metals at different positions in the pipeline.
In some alternative embodiments, the lug comprises:
in some alternative embodiments, the external connector has a pin structure or a slot structure.
In some alternative embodiments, the resilient insulating layer covers a portion of the lug.
In some alternative embodiments, the magnetic core is a liquid phase metal mixed with a magnetic substance.
In some alternative embodiments, the resilient insulating layer is coated on the outer wall of the magnetic core; the electric heating wire comprises: and the insulating spacer is used for blocking the magnetic core from contacting the connector lug.
Another object of the present invention is to provide an electric heating device to solve the problems of the prior art.
In some illustrative embodiments, the electrothermal device comprises: the heating wire or the heating wire group formed by at least two heating wires; the electric heating wire or the electric heating wire group is in a planar structure or a space three-dimensional structure.
Compared with the prior art, the invention has the following advantages:
1. According to the invention, through the electromagnetic heating structure in the wire rod, the electric heating efficiency of the electric heating wire is improved;
2. The invention prepares the electric heating wire by utilizing the liquid phase metal and the elastic insulator, so that the electric heating wire has tensile property and can meet the use/installation requirements of different sizes and lengths.
Drawings
FIG. 1 is a partial exterior view of an electrical heating wire in an embodiment of the invention;
FIG. 2 is a schematic view of the structure of an electric heating wire body according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of an electric heating wire body in an embodiment of the present invention;
FIG. 4 is a schematic illustration of the tube formation in the elastomeric insulator in accordance with an embodiment of the present invention;
FIG. 5 is a schematic view of the structure of an elastic insulator according to an embodiment of the present invention;
FIG. 6 is a schematic view of the structure of an elastic insulator according to an embodiment of the present invention;
FIG. 7 is a schematic view of the structure of an elastic insulator according to an embodiment of the present invention;
FIG. 8 is a schematic view of a portion of a wire body in an embodiment of the invention;
Fig. 9 is a schematic structural view of a connector lug in an embodiment of the invention;
fig. 10 is a schematic structural view of an electric heating wire in an embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. These embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
In the embodiment of the invention, elasticity refers to the property that an object deforms under the action of external force, and the object can recover the original size and shape after the external force is removed. Insulation refers to electrical insulation.
Referring to fig. 1-3, fig. 1-3 show schematic structural diagrams of an electric heating wire according to an embodiment of the invention.
The electric heating wire 1000 includes a wire body 100 and wire ends 200 at both ends of the wire body. The wire body 100 comprises a magnetic core 101 and an elastic insulator 102 which covers the magnetic core 101; wherein, the layer body of the elastic insulator 102 is internally provided with a pipeline 103 which surrounds the magnetic core in a spiral shape; liquid phase metal 104 poured into the pipe 103.
According to the invention, the electric heating wire manufactured by adopting the electromagnetic heating structure in the pipeline material is greatly improved in electric heating efficiency compared with the traditional resistance heating mode.
The magnetic core 101 may be made of flexible material. In the embodiment of the invention, the flexible magnetic core can be magnetic slurry, and the fluidity of the magnetic slurry can enable the slurry to deform along with the stretching, bending and extrusion of the elastic carrier. Under certain conditions, the fluidity of the liquid phase metal is higher than that of water, the density is higher, the liquid phase metal can be used for mixing magnetic particle substances to prepare magnetic liquid slurry, the magnetic particle substances and the liquid phase metal are easy to uniformly mix, and the magnetic whole of a magnetic core formed by the liquid phase metal and the magnetic particle substances is uniform in magnetic performance.
The magnetic particle material can be selected from iron powder, nickel powder, cobalt powder, iron oxide (such as gamma-Fe 2O3、Fe3O4), nickel oxide, cobalt oxide and neodymium iron boron powder; the particle size of the magnetic particle material can be selected from the range of 10nm-50 um.
The liquid phase metal in the embodiment of the invention can be low melting point metal or alloy with the melting point below 300 ℃, and the components comprise one or more of gallium, indium, tin, zinc, bismuth, lead, cadmium, mercury, sodium, potassium, magnesium, aluminum, iron, cobalt, manganese, titanium, vanadium, boron, carbon, silicon and the like, and the liquid phase metal can be in the form of metal simple substance, alloy or conductive nano fluid formed by mixing metal nano particles with a fluid dispersing agent.
Specifically, the liquid phase metal comprises one or more of mercury, gallium, indium, tin simple substance, gallium indium alloy, gallium indium tin alloy, gallium zinc alloy, gallium indium zinc alloy, gallium tin zinc alloy, gallium indium tin zinc alloy, gallium tin cadmium alloy, gallium zinc cadmium alloy, bismuth indium alloy, bismuth tin alloy, bismuth indium zinc alloy, bismuth tin zinc alloy, bismuth indium tin zinc alloy, tin lead alloy, tin copper alloy, tin zinc copper alloy, tin silver copper alloy and bismuth lead tin alloy.
In some embodiments, the liquid phase metal can be selected from liquid phase metals with melting point not higher than 30 ℃, and the liquid phase metal with the melting point range can be kept in a liquid state at normal temperature and is not easy to solidify at normal temperature. Preferably, the liquid phase metal is gallium-indium alloy, the proportion of which is 75.5 percent of gallium and 24.5 percent of indium, and the melting point of the alloy is 10.5 degrees. The gallium-indium alloy in the proportion is kept in a liquid state at normal temperature, and the melting point of 10.5 ℃ can enable the gallium-indium alloy to have higher fluidity than water at normal temperature.
The liquid phase metal forming the magnetic core and the liquid phase metal forming the metal coil in the inner pipeline of the elastic insulator can be selected from liquid phase metals with the same components and proportions, and can also be selected from liquid phase metals with different components and proportions. The components and the proportion of the liquid phase metal forming the magnetic core are biased to ensure that the magnetic core has good magnetic permeability; the composition, proportions of the liquid phase metal forming the metal coil in the elastomeric insulator inner tube are biased to provide good electrical conductivity to the metal coil.
In some embodiments, the elastomeric insulator 102 may be selected from polytetrafluoroethylene, polytrifluoroethylene, copolymers of ethylene and chlorotrifluoroethylene, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymers, perfluorovinyl ether and tetrafluoroethylene copolymers, fluorine-containing polyimides, silicone rubber, fluorosilicone rubber, peng silicone rubber, perfluoropolyethers, soft expanded polyurethanes, expanded polystyrene, silicone aerogels, polyperfluoroethylenepropylene, fluorine-containing polyheterocyanumaethylene siloxanes, fluorine-containing polyurethane elastomers, copolymers of vinylidene fluoride and chlorotrifluoroethylene, copolymers of vinylidene fluoride and hexafluoropropylene, tetrafluoroethylene and hydrocarbon propylene copolymers, perfluoropolyether rubber, tetrafluoroethylene-perfluoromethyl vinyl ether copolymers, and the like.
According to the embodiment of the invention, the electric heating wire formed by the flexible magnetic core, the elastomer and the flexible metal circuit can be integrally stretched to 20% -50%, and when the actual demand size is larger than the electric heating wire size, the electric heating wire can be stretched to meet the actual demand, so that the adaptability of installation and use of the electric heating wire is improved.
The elastic insulator 102 has at least two layers, and the layers are mutually attached; the conduit 103 is formed by a fit between mutually conforming layers. In the multilayer elastic insulator provided by the embodiment of the invention, the elastic insulating layers can be made of different elastic or flexible materials, but at least one elastic insulating layer is made of an elastic material, so that the elastic insulator has elastic properties. The formation of the pipe is shown in fig. 4, for example, a groove with the same structure as the pipe 103 is formed on the surface of one elastic insulating layer 102a, and the opening of the groove is sealed to form the pipe 103 by the adhesion of the other elastic insulating layer 102 b; also for example: grooves with opposite positions are formed in the surfaces of the elastic insulating layers which are mutually attached, and after the two elastic insulating layers are mutually attached, a pipeline is formed; in other embodiments, the conduit may be formed by extrusion.
In some embodiments of the invention, the conduit within the elastomeric insulator may be of unitary construction, such as a conduit structure formed directly in the elastomeric insulator by way of a dissolution die.
As shown in fig. 5 to 6, at least one layer (102 a or 102 c) of the multilayer structure of the elastic insulator 102 is provided to isolate the magnetic core 101 from the liquid phase metal 104 constituting the metal coil. For example, when the elastic insulator 102 has a 2-layer structure, the layer 102a of the layer adjacent to the magnetic core is used to isolate the magnetic core from the liquid phase metal, and the pipe is located between the layer and the other layer. When the elastic insulator 102 has a 3-layer or more structure, the layer 102c of the layer close to the magnetic core is used to isolate the magnetic core from the liquid phase metal, and the pipe may be disposed between the second layer and the third layer or between the higher layers far from the magnetic core.
In some embodiments, as shown in fig. 7, at least one interlayer structure located in the outer layer of the liquid phase metal is provided with a shielding coating 102d in the multilayer structure of the elastic insulator 102. For example, when the elastic insulator 102 has a 3-layer structure, the first layer, the second layer, and the third layer of the magnetic core 101 are gradually separated from each other, wherein a pipe filled with a liquid phase metal 104 is formed between the first layer and the second layer, and a shielding paint 102d is applied between the second layer and the third layer.
In some embodiments, the layers in the elastomeric insulator 102 may be made of materials with different functions and properties according to their layer relationships; wherein the layer used for coating the magnetic core has elastic, heat-resistant and insulating properties, such as silicone rubber, fluorosilicone rubber, peng silicone rubber or perfluoropolyether; the layer used to form the pipe should have heat resistant, insulating properties such as soft foamed polyurethane containing flame retardant, foamable polystyrene or silica aerogel containing flame retardant, etc.; the layer used to coat the barrier coating should have heat resistance, insulating properties, and high adhesion of the coated surface, such as polyperfluoroethylene propylene, fluorine-containing polyheterocyclic siloxane, fluorine-containing polyurethane elastomer, vinylidene fluoride and chlorotrifluoroethylene copolymer, vinylidene fluoride and hexafluoropropylene copolymer, tetrafluoroethylene and hydrocarbon propylene copolymer, perfluoropolyether rubber, tetrafluoroethylene-perfluoromethyl vinyl ether copolymer, etc.; the outermost layer of the elastomeric insulator should have heat resistant, insulating, and abrasion resistant properties such as, for example, poly (perfluoroethylene propylene), fluorine-containing poly (hybrid siloxane), fluorine-containing polyurethane elastomer, copolymer of vinylidene fluoride and chlorotrifluoroethylene, copolymer of vinylidene fluoride and hexafluoropropylene, copolymer of tetrafluoroethylene and hydrocarbon propylene, perfluoropolyether rubber, tetrafluoroethylene-perfluoromethyl vinyl ether copolymer, and the like.
As shown in fig. 8, in some embodiments, the elastic insulator 102 is wrapped on the outer wall of the magnetic core 101, that is, the elastic insulator 102 has a tubular structure, and insulating spacers 105 are disposed at the nozzles on two sides of the elastic insulator to isolate the magnetic core 102 from external current. The insulating spacer 105 may be made of polytetrafluoroethylene, polytrifluoroethylene, a copolymer of ethylene and chlorotrifluoroethylene, polyvinylidene fluoride, an ethylene-tetrafluoroethylene copolymer, a perfluorovinyl ether-tetrafluoroethylene copolymer, a fluorine-containing polyimide, or the like. In some embodiments, where the core 101 is a magnetic slurry, the insulating spacer 105 also serves to seal the two-sided nozzles of the elastomeric insulator.
In some embodiments, when the elastic insulator 102 is a multi-layer structure, the innermost layer is coated on the outer wall of the magnetic core 101, and the outer layer is coated with both the insulating spacer 105 and the innermost layer.
As shown in fig. 9, a connector lug 200 is provided at the end of the wire body 100, one end of which is fixed to the wire body in contact (electrical connection) with the liquid phase metal constituting the metal coil in the wire body, and one end of which is remote from the wire body for connection to a power source, other connector lug or other conductive structure.
The connector lug 200 in the embodiment of the invention comprises an inner connector 201 and an outer connector 202 which are mutually conductive; the inner connector 201 is in contact (electrically connected) with the liquid phase metal at the pipe orifice; the external connector 202 is connected with an external power source, other connector lug, or other conductive structure. Wherein, the inner connector 201 and the outer connector 202 are both made of conductive materials. In some embodiments, the inner connector 201 and the outer connector 202 are connected by a connecting portion 203 made of conductive material, and the three may be integrated structures or mutually conductive structures formed after assembly.
The inner connector 201 may be a wire, or may be a sheet-shaped contact, a circular arc-shaped contact or a circular ring-shaped contact having a corresponding arc. The inner connector 201 can be designed into corresponding shapes and sizes according to the contact area (shape of a pipe orifice) of the liquid phase metal, and the inner connector 201 is in contact with the liquid phase metal to conduct electricity mutually on one hand, and the plugging pipe orifice keeps the liquid phase metal in the pipe on the other hand.
The outer connector 202 may be made of any conductive material that facilitates the shape of the installation, such as wires, metal studs with threaded surfaces, and pin and socket structures.
In some embodiments, the inner connector piece 201 of the connector lug 200 is encapsulated within the elastic insulator 102, and the outer connector piece 202 is exposed outside the elastic insulator 102 for external connection.
In some embodiments, the connecting part 203 on the connector lug 200 for connecting the inner connector 201 and the outer connector 202 is in a circular sheet structure, the inner connector 201 is arranged at the edge of the connecting part 203 and is perpendicular to the end face of the connecting part 203, and is opposite to a pipe orifice in the elastic insulator 102 and is in contact connection with liquid phase metal discharged from the pipe orifice; the outer connector 202 is disposed on an end surface of the connecting portion 203 opposite to the inner connector 201. One of the layers of the elastic insulator 102 is wrapped around the inner layer, the connection portion 203 on the connector lug 200, and the inner connector 201.
In another embodiment, the connecting part 203 is a tubular structure with a single-sided seal, the pipe orifice is sleeved at the end part of the inner layer of the elastic insulator, the internal connecting piece 201 is arranged at the edge of the pipe orifice, is opposite to the pipe orifice of the pipeline 103, and is in contact connection with the liquid phase metal 104 from the pipe orifice; the outer layer of the elastic insulator covers the inner layer, the connection portion 203 on the connector lug 200, and the inner connector 201.
Referring to fig. 10, the present invention also discloses a preferred embodiment of the heating wire, which includes: an elastic insulating layer 6 of tubular structure; the tube barrel of the elastic insulating layer 6 is filled with liquid phase metal mixed with magnetic particle substances as a magnetic core 7; the two end openings of the elastic insulating layer 6 are respectively sealed by an insulating spacer 3; the outer wall of the elastic insulating layer 7 is provided with a spiral groove, the groove extends from one end of the elastic insulating layer to the other end, and liquid phase metal 5 is filled in the groove; the two connector lugs are respectively arranged at two sides of the elastic insulating layer 6, the upper connecting part 2 of the connector lug is attached to the outer end face of the insulating spacer 3, the inner connecting piece 4 points to the groove opening and contacts with the liquid phase metal 5 at the groove opening, and the outer connecting piece 1 is a metal column head; the elastic insulating flame-retardant layer 8 is positioned on the outer layer of the elastic insulating layer 6, and the elastic insulating flame-retardant layer 8 coats the connecting part 2 and the inner connecting piece 4 of the connector lug and the outer wall of the elastic insulating layer 6 and grooves on the outer wall, so that the grooves form a tubular structure; an inner sheath 9 coated on the elastic insulating flame retardant layer 8; a shielding coating 10 coated on the outer wall of the inner sheath 9; an outer sheath 11 covering the shielding coating 10; in this embodiment, the two external connectors of the connector lug are pins and slots respectively.
The present invention is based on the electric heating wire 1000 in the above embodiment, and further proposes an electric heating device, including: the heating wire or the heating wire group formed by at least two heating wires in the embodiment; the electric heating wire or the electric heating wire group is in a planar structure or a space three-dimensional structure. Wherein, two or more than two heating wires can work independently of each other, or can be spliced into a whole through the connector lug to work together.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
Claims (2)
1. An electrical heating wire, comprising: an elastic insulating layer of tubular structure; the tube barrel of the elastic insulating layer is filled with liquid phase metal mixed with magnetic particle substances as a magnetic core; the two end openings of the elastic insulating layer are respectively sealed by an insulating spacer; the outer wall of the elastic insulating layer is provided with a spiral groove, the groove extends from one end of the elastic insulating layer to the other end, and liquid phase metal is filled in the groove; the two connector lugs are respectively arranged at two sides of the elastic insulating layer, the upper connecting parts of the two connector lugs are attached to the outer end surfaces of the insulating isolation pieces, the internal connecting pieces point to the groove openings and are contacted with liquid phase metal at the groove openings, and the external connecting pieces are metal column heads; the elastic insulating flame-retardant layer is positioned on the outer layer of the elastic insulating layer, and the elastic insulating flame-retardant layer covers the connecting part of the connector lug, the internal connecting piece and the outer wall of the elastic insulating layer and grooves on the outer wall of the elastic insulating layer, so that the grooves form a tubular structure; an inner sheath coated on the elastic insulating flame-retardant layer; a barrier coating applied to the outer wall of the inner sheath; an outer sheath covering the shielding coating; wherein, two external connection pieces of connector lug are contact pin and slot respectively.
2. An electric heating apparatus, comprising: a heating wire or a heating wire group consisting of at least two of the heating wires as claimed in claim 1;
the electric heating wire or the electric heating wire group is in a planar structure or a space three-dimensional structure.
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| CN201810420661.8A CN108601124B (en) | 2018-05-04 | 2018-05-04 | Electric heating wire and electric heating device |
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