Heating cable for high-grade building

Abstract

The utility model relates to the technical field of heating cables, in particular to a heating cable for a high-grade building, which comprises two heating conductors which are symmetrically arranged, and a high-temperature-resistant insulating heat conductor I with a convex section is arranged between the two heating conductors. The two heating conductors abut against the left side and the right side of the protruding end of the first high-temperature-resistant insulating heat conductor respectively, an insulating block is arranged in the protruding end of the first high-temperature-resistant insulating heat conductor, and a heat insulation layer is arranged at the protruding bottom of the first high-temperature-resistant insulating heat conductor. The upper portions of the two heating conductors are covered with a second inverted-U-shaped high-temperature-resistant insulating heat conductor, the two ends of the U shape of the second high-temperature-resistant insulating heat conductor make contact with the surface of the heat insulation layer respectively, and an electromagnetic shielding layer is arranged outside a ring formed by the second high-temperature-resistant insulating heat conductor and the heat insulation layer. According to the electromagnetic shielding heating cable, the heat dissipation area can be increased, and meanwhile the heat radiation heating efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of heating cable technology, specifically to a high-end building heating cable. Background Technology

[0002] Sustainable development for both humanity and the environment is one of the main principles of current human development, requiring a balance between development and maintaining a green and environmentally friendly ecosystem. Traditional heating systems rely on combustion to provide heat energy, which is then transmitted to various locations requiring heating through a heat source network. However, the combustion of coal, oil, or gas causes severe pollution, damages the ecological environment, and exacerbates global warming. Changing the traditional heating system and its operating principles to reduce environmental damage is an important task that humanity needs to focus on. Geothermal cable heating systems have emerged to address this issue, fundamentally solving the problem of environmental pollution.

[0003] Geothermal cables are cables that use electricity as their energy source, employing alloy heating wires to generate heat by passing electricity through them, thus converting electrical energy into heat energy. Because people feel radiant heat best, radiant floor heating via geothermal cables is widely recognized in the HVAC industry as one of the most ideal and advanced heating methods.

[0004] However, current traditional metal wire heating cables have the problem of high electromagnetic radiation and circumferential heat radiation, resulting in low thermal efficiency on the base plate surface. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a high-end building heating cable.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-grade building heating cable, characterized in that: it includes two symmetrically arranged heating conductors, with a convex-shaped high-temperature resistant insulating heat conductor I disposed between the two heating conductors, the two heating conductors respectively abutting against the left and right sides of the convex end of the high-temperature resistant insulating heat conductor I, an insulating block disposed inside the convex end of the high-temperature resistant insulating heat conductor I, a heat insulation layer disposed at the convex bottom of the high-temperature resistant insulating heat conductor I, an inverted U-shaped high-temperature resistant insulating heat conductor II covered on the upper part of the two heating conductors, the two U-shaped ends of the high-temperature resistant insulating heat conductor II respectively contacting the surface of the heat insulation layer, an electromagnetic shielding layer disposed outside the annulus formed by the high-temperature resistant insulating heat conductor II and the heat insulation layer, and a water-blocking sheath disposed outside the electromagnetic shielding layer.

[0007] In some embodiments, the heating conductor is a carbon fiber heating element with a rectangular cross-section.

[0008] In some embodiments, the high-temperature resistant insulating heat conductor one and the high-temperature resistant insulating heat conductor two are made of polytetrafluoroethylene.

[0009] In some embodiments, the insulating block is made of cross-linked polyethylene.

[0010] In some embodiments, the electromagnetic shielding layer is a braided layer of multi-strand tin-plated copper wire.

[0011] In some of these embodiments, the water-blocking sheath shown is made of flame-retardant polyvinyl chloride.

[0012] Compared with the prior art, the beneficial effects of this utility model are: through the structural design of symmetrical heating conductor and convex high temperature resistant insulating heat conductor, combined with electromagnetic shielding layer and heat insulation layer, electromagnetic radiation is effectively reduced and heat is directed to the ground, which has the advantages of reducing electromagnetic radiation and improving the efficiency of ground heat conduction.

[0013] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. The embodiments of this application will provide a detailed description and understanding of the application. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] In the diagram: 1. Heating conductor; 2. High-temperature resistant insulating heat conductor one; 3. Insulating block; 4. Heat insulation layer; 5. High-temperature resistant insulating heat conductor two; 6. Electromagnetic shielding layer; 7. Water-blocking sheath. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In traditional metal wire heating cable systems, excessive electromagnetic radiation can easily cause signal interference in electronic devices. Circumferential thermal radiation causes heat to diffuse uniformly along the cable axis, failing to effectively transfer it directionally to the ground surface, significantly reducing thermal efficiency. Uneven distribution of the heat-conducting medium within the cable's multi-layered structure and insufficient high-temperature resistance of the insulation material further exacerbate heat loss and the risk of localized overheating, affecting heating stability and energy utilization.

[0018] For example, in the underground heating system of a commercial complex, metal wire heating cables release heat into the concrete filling layer through circumferential heat conduction. The heat flow diffuses evenly along the cable axis to the surrounding medium, with only a portion of the heat transferred to the surface decorative layer through radiation. The alloy conductors inside the cable generate a high-frequency electromagnetic field under alternating current, causing continuous interference to precision instruments and communication equipment within the building. Multi-layer insulation materials undergo thermal aging under high-temperature conditions, leading to localized insulation failure. Heat is transferred disorderly between conductors, exacerbating axial heat loss and resulting in uneven and fluctuating surface temperature distribution.

[0019] If the above problems are not addressed, high-frequency electromagnetic interference will cause abnormal operation of building intelligent equipment, increasing maintenance costs and safety hazards. The circumferential heat diffusion mode reduces the directionality of heat transfer, and the surface heating rate and temperature uniformity cannot meet the requirements of high-precision temperature control, forcing the system to extend heating time to compensate for heat loss, resulting in a significant increase in energy waste. The degradation of the thermal properties of multi-layered materials accelerates the overall aging of cables, and localized overheating areas pose a risk of insulation breakdown, leading to a continuous decline in system lifespan and reliability.

[0020] To address the aforementioned issues, this application first explores optimized conductor layout and shielding structure for high-frequency electromagnetic interference. Traditional circumferential conductor arrangements form closed loops, generating strong electromagnetic fields from alternating current. This application considers symmetrically placed dual conductors forming reverse current loops, utilizing magnetic field cancellation to reduce radiation intensity. Regarding insufficient heat flow directionality, the limitations of circumferential heat conduction paths are analyzed, and a vertically oriented directional heat conduction channel is proposed. A convex insulating heat conductor is embedded in the conductor gap to guide heat to concentrate and transfer to the ground surface. Concerning the thermal performance degradation of multilayer materials, the combination of different high-temperature resistant materials is studied. An inverted U-shaped heat conductor covers the heating unit, forming a closed heat conduction network to prevent disordered axial heat diffusion. Furthermore, the spatial distribution of the insulation layer and electromagnetic shielding layer 6 is integrated, and the compatibility of the water-blocking sheath 7 with the internal structure is optimized to achieve overall performance balance.

[0021] In this regard, such as Figure 1 As shown, this application proposes a heating cable for high-end buildings, comprising two symmetrically arranged heating conductors 1, with a convex-shaped high-temperature resistant insulating heat conductor 2 disposed between the two heating conductors 1. The two heating conductors 1 are respectively positioned on the left and right sides of the convex end of the high-temperature resistant insulating heat conductor 2. An insulating block 3 is disposed inside the convex end of the high-temperature resistant insulating heat conductor 2. A heat insulation layer 4 is disposed at the convex bottom of the high-temperature resistant insulating heat conductor 2. An inverted U-shaped high-temperature resistant insulating heat conductor 2 5 is disposed on the upper part of the two heating conductors 1. The two ends of the U-shape of the high-temperature resistant insulating heat conductor 2 5 are respectively in contact with the surface of the heat insulation layer 4. An electromagnetic shielding layer 6 is disposed outside the annular structure formed by the high-temperature resistant insulating heat conductor 2 5 and the heat insulation layer 4. A water-blocking sheath 7 is disposed outside the electromagnetic shielding layer 6.

[0022] The two symmetrically arranged heating conductors 1 refer to two heating elements arranged symmetrically, specifically made of carbon fiber. This symmetrical structure improves the uniformity of heat distribution and reduces localized overheating or insufficient thermal efficiency. The high-temperature resistant insulating heat conductor 2 is a convex-shaped insulating heat-conducting component, specifically made of polytetrafluoroethylene (PTFE). This convex structure provides stable support and a heat conduction path for the heating conductors 1, while preventing short circuits between conductors. The insulating block 3 is an insulating component embedded inside the protruding end of the high-temperature resistant insulating heat conductor 2, specifically made of cross-linked polyethylene (XLPE), used to isolate the electrical connections of the heating conductors 1, ensuring safe operation. The heat insulation layer 4 is a heat insulation structure covering the bottom of the high-temperature resistant insulating heat conductor 2, improving heat utilization efficiency by preventing downward heat loss. The inverted U-shaped high-temperature resistant insulating heat conductor 5 is a heat-conducting component covering the two heating conductors 1, with its U-shaped ends contacting the heat insulation layer 4 to form a closed heat conduction channel, enhancing the upward heat transfer efficiency. The electromagnetic shielding layer 6 refers to the shielding structure wrapped around the high-temperature resistant insulating heat-conducting body 5 and the heat insulation layer 4. Specifically, it can be a multi-strand tinned copper wire braided layer, used to reduce electromagnetic radiation generated during cable operation. The water-blocking sheath 7 refers to the outermost protective structure of the cable, specifically made of flame-retardant polyvinyl chloride material, used to isolate external moisture and improve the cable's fire resistance.

[0023] The core innovation of this application lies in the combination of symmetrical heating conductor 1 and convex high-temperature resistant insulating heat conductor 2, combined with the multi-layer structure of inverted U-shaped heat conductor 2 and electromagnetic shielding layer 6, to achieve directional heat conduction, electromagnetic radiation suppression and environmental protection, thereby solving the problems of low thermal efficiency and high electromagnetic radiation of traditional metal wire heating cables.

[0024] The working process and principle of this application are as follows: A high-end building heating cable includes two symmetrically arranged heating conductors 1. A convex-shaped high-temperature resistant insulating heat conductor 2 is placed between the two heating conductors 1. The two heating conductors 1 are respectively positioned on the left and right sides of the convex end of the high-temperature resistant insulating heat conductor 2. An insulating block 3 is placed inside the convex end of the high-temperature resistant insulating heat conductor 2. A heat insulation layer 4 is placed at the convex bottom of the high-temperature resistant insulating heat conductor 2. An inverted U-shaped high-temperature resistant insulating heat conductor 2 5 is placed over the two heating conductors 1. The two ends of the U-shape of the high-temperature resistant insulating heat conductor 2 5 are in contact with the surface of the heat insulation layer 4. An electromagnetic shielding layer 6 is placed outside the annular structure formed by the high-temperature resistant insulating heat conductor 2 5 and the heat insulation layer 4. A water-blocking sheath 7 is placed outside the electromagnetic shielding layer 6.

[0025] This structural design uses symmetrically arranged heating conductors 1 to form reverse current loops, utilizing the mutual cancellation of magnetic fields to reduce electromagnetic radiation. A convex-shaped high-temperature resistant insulating heat conductor 1 2 and an inverted U-shaped high-temperature resistant insulating heat conductor 2 5 cover the heating unit, forming a closed heat conduction network to prevent disordered axial heat diffusion. Simultaneously, the heat insulation layer 4 prevents heat from diffusing downwards. An electromagnetic shielding layer 6 suppresses electromagnetic radiation leakage. A water-blocking sheath 7 protects the internal structure from external moisture intrusion.

[0026] This structural design enables directional heat transfer and effective shielding of electromagnetic radiation, improving heating efficiency and system safety.

[0027] As a preferred embodiment, the solution of this application is specifically implemented as follows:

[0028] The heating cable for high-end buildings consists of, from the inside out, two heating conductors 1, a high-temperature resistant insulating heat conductor one 2, an insulating block 3, a heat insulation layer 4, a high-temperature resistant insulating heat conductor two 5, an electromagnetic shielding layer 6, and a water-blocking sheath 7.

[0029] Two heating conductors 1 are symmetrically arranged and made of carbon fiber. The high-temperature resistant insulating heat conductor 2 is made of polytetrafluoroethylene and has a convex cross-section. The two heating conductors 1 are respectively attached to the left and right sides of the convex end of the high-temperature resistant insulating heat conductor 2. The convex end of the high-temperature resistant insulating heat conductor 2 is hollow inside and contains an insulating block 3 made of cross-linked polyethylene.

[0030] A heat insulation layer 4 is provided on the convex bottom of the high-temperature resistant insulating heat conductor 1 2. An inverted U-shaped high-temperature resistant insulating heat conductor 2 5, also made of polytetrafluoroethylene, is placed above the two heating conductors 1. The two U-shaped ends of the high-temperature resistant insulating heat conductor 2 5 are in contact with the surface of the heat insulation layer 4, forming a closed structure, which prevents heat from being transferred downward and improves the efficiency of heat transfer upward.

[0031] An electromagnetic shielding layer 6, composed of a high-temperature resistant insulating heat conductor 5 and a heat insulation layer 4, is provided on the outer ring. This layer is made of multiple strands of tin-plated copper wire. The outermost layer of the electromagnetic shielding layer 6 is a water-blocking sheath 7, made of flame-retardant polyvinyl chloride material.

[0032] Through the above scheme, this application achieves directional heat transfer and effective shielding of electromagnetic radiation. The convex high-temperature resistant insulating heat conductor 2 constructs a vertical heat conduction channel, guiding heat to be concentrated and transferred to the ground surface, improving heating efficiency. The symmetrically arranged heating conductors 1 form reverse current loops, using magnetic fields to cancel each other out and reduce electromagnetic radiation intensity. The inverted U-shaped high-temperature resistant insulating heat conductor 5 and the thermal insulation layer 4 form a closed heat conduction network, preventing disordered axial heat diffusion and further improving thermal efficiency. The combination of multiple layers optimizes overall performance and improves system safety and reliability. This design solves the problems of high electromagnetic radiation and low thermal efficiency found in traditional metal wire heating cables, providing a more efficient and safer heating solution for high-end buildings.

[0033] In some of the above-mentioned solutions in this application, the two symmetrically arranged heating conductors 1 are made of traditional metal materials, which have the problem of high electromagnetic radiation during the heating process. At the same time, the cross-sectional shape of the traditional heating conductor 1 results in insufficient contact area with the high-temperature resistant insulating heat conductor 2, resulting in low heat transfer efficiency and affecting the overall thermal efficiency of the heating cable.

[0034] This application further proposes that the heating conductor 1 is a carbon fiber heating element with a rectangular cross-section.

[0035] The rectangular cross-section of the carbon fiber heating element allows it to form a planar contact with the high-temperature resistant insulating heat conductor 2, increasing the effective heat transfer area. The carbon fiber material has high electrical conductivity and low electromagnetic radiation characteristics, which can reduce electromagnetic interference. The long side of the rectangular cross-section is parallel to both sides of the protruding end of the high-temperature resistant insulating heat conductor 2, ensuring that heat is uniformly conducted to the insulating heat conductor along the longitudinal direction. The carbon fiber heating element is formed into a regular rectangular structure through a pressing process, and the surface flatness meets the requirements for close contact with the insulating heat conductor.

[0036] Specifically, the cuboid cross-section of the carbon fiber heating element is bonded to both sides of the protruding end of the high-temperature resistant insulating heat conductor 2 via a planar contact method. Heat is directly transferred to the insulating heat conductor through the contact surface, avoiding increased local thermal resistance due to poor contact. The low resistance of carbon fiber reduces energy loss when current passes through, minimizing heat dissipation. The long side of the cuboid cross-section is distributed along the cable axis, allowing heat to diffuse evenly along the cable length, further improving thermal conductivity. Furthermore, the chemical stability of carbon fiber prevents reactions with the insulating material at high temperatures, ensuring long-term reliability. By optimizing the cross-sectional shape and material properties, electromagnetic radiation is reduced while heat conduction efficiency is improved, thus achieving energy-saving and environmentally friendly heating effects.

[0037] As a preferred embodiment, the solution of this application is implemented as follows: The heating conductor 1 is a carbon fiber heating element with a rectangular cross-section. The carbon fiber heating element can be woven from multiple carbon fiber bundles, each carbon fiber bundle consisting of thousands of carbon fiber monofilaments. The length of the carbon fiber heating element can be cut according to actual needs, with a width of 10 mm and a thickness of 2 mm. The carbon fiber heating element is connected to a copper wire through conductive adhesive to realize the input of electrical energy.

[0038] Through the above technical solution, this application improves the heating efficiency of the cable. The carbon fiber heating element has good electrical conductivity and thermal stability, enabling it to quickly and uniformly convert electrical energy into heat energy. Simultaneously, the cuboid cross-sectional structure of the carbon fiber heating element increases the contact area with the surrounding insulating heat conductor, which is beneficial for heat transfer and distribution. Furthermore, the lightweight nature of the carbon fiber heating element helps reduce the overall weight of the cable, facilitating installation and use.

[0039] In some of the above-mentioned solutions of this application, high-temperature resistant insulating heat conductor 1 2 and high-temperature resistant insulating heat conductor 2 5 are proposed as key components for heat transfer and insulation in cable structure. However, under high-temperature conditions, if the thermal stability of the heat conductor material is insufficient, it may cause deformation of the heat conductor structure, which in turn causes the contact between the heating conductor 1 and the heat conductor to fail, resulting in uneven heat conduction or local overheating. At the same time, the deterioration of the insulation performance of the material will increase the risk of current leakage and affect the working efficiency of the electromagnetic shielding layer 6.

[0040] This application further proposes that the high-temperature resistant insulating heat conductor 12 and the high-temperature resistant insulating heat conductor 25 are made of polytetrafluoroethylene.

[0041] The high bond energy of carbon-fluorine bonds in the molecular structure of polytetrafluoroethylene (PTFE) ensures stable physicochemical properties within a temperature range of -200℃ to 260℃. Furthermore, its extremely low surface energy and non-stick properties prevent adhesion to the heating conductor 1 or the thermal insulation layer 4 at high temperatures. PTFE has a thermal conductivity of 0.25 W / (m·K), forming a uniform heat flow path within the insulating heat conductor one, ensuring that the heat generated by the two heating conductors 1 is conducted to the thermal insulation layer 4 along the convex cross-section. Simultaneously, its volume resistivity is greater than 1×10^18 Ω·cm, effectively isolating current leakage between the heating conductor 1 and the external electromagnetic shielding layer 6. In the inverted U-shaped structure of the insulating heat conductor two, PTFE's arc resistance can withstand long-term electric field effects, preventing insulation breakdown.

[0042] Specifically, polytetrafluoroethylene (PTFE) is injection molded into a convex cross-section of insulating heat conductor one and an inverted U-shaped structure of insulating heat conductor two. The convex end of insulating heat conductor one has an embedded insulating block 3, and its bottom is bonded to the heat insulation layer 4. The two ends of the inverted U-shaped insulating heat conductor two are pressed against the surface of the heat insulation layer 4. When the heating conductor 1 is energized, the high-temperature resistance of PTFE allows it to maintain shape stability under continuous heat load, preventing separation from the contact surface with the heating conductor 1 due to thermal expansion. This ensures efficient heat transfer to the insulation layer through the convex cross-section. Simultaneously, its low dielectric constant reduces the distortion of the electric field inside the cable, reducing the accumulation of induced charge in the electromagnetic shielding layer 6. The high chemical inertness of this material further prevents electrochemical corrosion with the tin-plated copper wire braid layer, ensuring the long-term effectiveness of the electromagnetic shielding function. As a preferred embodiment, the solution of this application is specifically implemented as follows: the high-temperature resistant insulating heat conductor one 2 and the high-temperature resistant insulating heat conductor two 5 of the high-end building heating cable are made of polytetrafluoroethylene. Polytetrafluoroethylene (PTFE) possesses excellent high-temperature resistance and thermal conductivity, effectively conducting the heat generated by the heating conductor 1 while maintaining good insulation properties. The high-temperature resistant insulating heat conductor 2 has a convex cross-section, with the two heating conductors 1 respectively positioned abutting on the left and right sides of its convex ends. The high-temperature resistant insulating heat conductor 5 is inverted U-shaped, covering the two heating conductors 1, with its U-shaped ends in contact with the surface of the thermal insulation layer 4. This structural design ensures effective heat conduction and maintains insulation performance.

[0043] Through the above technical solution, this application achieves highly efficient heat conduction and insulation performance. The use of polytetrafluoroethylene (PTFE) material improves the high-temperature resistance of the heating cable and enhances heat conduction efficiency. Simultaneously, the insulation performance of this material ensures the safety and stability of the cable. This design effectively solves the problem of low thermal efficiency in traditional metal wire heating cables and improves the overall performance of the heating system.

[0044] In some of the above-mentioned solutions of this application, an insulating block 3 is provided inside the protruding end of the high-temperature resistant insulating heat conductor 2 to achieve electrical isolation between conductors.

[0045] This application further proposes that the insulating block 3 is made of cross-linked polyethylene.

[0046] Cross-linked polyethylene (XLPE) forms a three-dimensional network molecular structure through a chemical cross-linking reaction, achieving a heat distortion temperature of 110-120℃ and a long-term operating temperature limit of 90℃. This material maintains molecular chain stability under high-temperature conditions, preventing increased gaps between itself and the high-temperature insulating thermal conductor 2 due to thermal expansion. The volume resistivity of XLPE reaches 1×10^16 Ω·cm, maintaining stable insulation performance even at high temperatures. When the degree of cross-linking of the insulating block 3 is 60-70%, it balances mechanical strength and thermal stability. This material forms a gapless fit with the high-temperature insulating thermal conductor 2 through extrusion molding. The difference between the linear expansion coefficients of XLPE and polytetrafluoroethylene (PTFE) is controlled within 5×10^-5 / ℃, ensuring a tight seal between the contact surfaces during temperature changes.

[0047] Specifically, when the heating conductor 1 is energized and reaches an operating temperature of 80-100℃, the cross-linked polyethylene insulating block 3 resists thermal stress through its stable molecular structure. Its thermal conductivity of 0.4 W / (m·K) allows some heat to be conducted to the thermal insulation layer 4, preventing excessive heat accumulation between the conductors. The melt flow index of cross-linked polyethylene is below 0.5 g / 10 min, preventing flow deformation at high temperatures and maintaining the geometric integrity of the insulating block 3. When combined with the high-temperature resistant insulating thermal conductor 2 made of polytetrafluoroethylene, the contact thermal resistance at the interface between the two is reduced to 0.02 m²·K / W, ensuring heat conduction along a predetermined path. This material selection enables the insulating block 3 to maintain structural stability under high-temperature conditions, effectively blocking current leakage caused by the potential difference between the heating conductors 1. Its breakdown voltage reaches 30 kV / mm, more than three times higher than that of ordinary polyethylene.

[0048] As a preferred embodiment, the specific implementation of this application is as follows: The insulating block 3 is made of cross-linked polyethylene. Cross-linked polyethylene is a thermosetting plastic with excellent electrical insulation and heat resistance properties. In the preparation process, the polyethylene raw material is first heated to a molten state, and then cross-linked by chemical or physical methods. The cross-linking treatment can be carried out by irradiation cross-linking or chemical cross-linking. Irradiation cross-linking involves exposing the polyethylene to a high-energy electron beam or gamma rays, causing chemical bonds to form between the molecular chains. Chemical cross-linking involves adding a cross-linking agent to the polyethylene and promoting the formation of chemical bonds between the molecular chains under heating conditions. After cross-linking is completed, the material is cooled and molded into the desired shape of the insulating block 3.

[0049] Through the above technical solution, this application achieves high-temperature stability and electrical insulation performance of the insulating block 3. The cross-linked polyethylene insulating block 3 maintains shape stability under high-temperature environments and is not easily deformed or melted. Simultaneously, cross-linked polyethylene exhibits excellent electrical insulation properties, effectively preventing current leakage between the heating conductors 1. Furthermore, cross-linked polyethylene possesses good mechanical strength and aging resistance, extending the service life of the insulating block 3.

[0050] In some of the solutions described above in this application, the material and structural design of the electromagnetic shielding layer 6 are crucial for suppressing electromagnetic radiation generated during cable operation. Traditional metal wire heating cables suffer from insufficient electromagnetic shielding effectiveness, resulting in high electromagnetic radiation, which affects thermal efficiency and may cause environmental interference.

[0051] This application further proposes that the electromagnetic shielding layer 6 is a multi-strand tin-plated copper wire braided layer.

[0052] The multi-strand tinned copper wire is braided to form a continuous mesh structure. The surface plating of the tinned copper wire enhances its conductivity and oxidation resistance, while the multi-strand stranding design improves the flexibility and tensile strength of the braided layer. The braided layer tightly wraps around the annular structure formed by the high-temperature resistant insulating thermal conductor 5 and the thermal insulation layer 4. The braiding density is adjusted according to the cable's operating current intensity to ensure a balance between electromagnetic shielding effectiveness and mechanical properties. The tin plating further prevents the copper wire from oxidizing in humid environments, extending the service life of the shielding layer.

[0053] Specifically, the multi-strand tinned copper wire braid confines the electromagnetic field generated by the heating conductor 1 within the cable through its conductive network. The high conductivity of the tinned copper wire causes electromagnetic energy to form eddy currents on the surface of the shielding layer and be converted into heat energy. This heat energy is conducted outward through the high-temperature resistant insulating heat conductor 5, preventing electromagnetic waves from radiating outward. The gaps in the braided structure are optimized to ensure shielding effectiveness while avoiding local electromagnetic leakage due to excessive gaps. The combination of the tinned layer and the water-blocking sheath 7 further prevents moisture penetration, maintaining the stability of the shielding layer in humid environments. This solution, through material selection and structural optimization, improves the cable's durability and environmental adaptability while suppressing electromagnetic radiation.

[0054] As a preferred embodiment, the solution of this application is implemented as follows: The electromagnetic shielding layer 6 is braided from multiple strands of tin-plated copper wire. Specifically, the electromagnetic shielding layer 6 is braided using multiple strands of tin-plated copper wire with a diameter of 0.15 mm. The braiding method is 16-spindle braiding, and the braiding angle is 45 degrees. The braiding density is 90% to ensure good electromagnetic shielding effect. The tin plating layer on the surface of the tin-plated copper wire is 2 micrometers thick to improve oxidation resistance.

[0055] Through the above technical solutions, this application effectively reduces the electromagnetic radiation of the cable and improves its safety. Consequently, electromagnetic interference generated during cable operation is effectively suppressed, reducing its impact on surrounding electronic equipment. Furthermore, the braided structure of multi-strand tin-plated copper wire enhances the cable's mechanical strength, improving its tensile and bending resistance. Simultaneously, the tin plating treatment improves the copper wire's oxidation resistance, extending the cable's service life.

[0056] In some of the solutions described above in this application, the material selection for the water-blocking sheath 7 fails to simultaneously meet the requirements of water-blocking performance and flame-retardant performance, resulting in safety hazards for the cable in high-temperature or humid environments.

[0057] This application further proposes that the water-blocking sheath 7 is made of flame-retardant polyvinyl chloride.

[0058] Among them, the oxygen index of flame-retardant polyvinyl chloride is controlled at ≥30%, and its flame retardancy is improved by adding inorganic flame retardants; the proportion of chlorine element in its molecular chain is ≥56%, forming a dense structure to achieve water-blocking effect; the melting temperature of the material is set at 160-180℃, which matches the thermal expansion coefficient of the tin-plated copper wire braided layer of the inner electromagnetic shielding layer 6, avoiding cracking caused by temperature changes; the sheath thickness is controlled at 1.2-1.8mm, and it is combined with the electromagnetic shielding layer 6 through a double-layer co-extrusion process, with the outer layer being a high-density flame-retardant layer and the inner layer being a flexible waterproof layer.

[0059] Specifically, when the flame-retardant PVC cable is heated, the chlorine decomposes to generate hydrogen chloride gas, diluting the oxygen concentration and slowing down the combustion process. Its closed-cell structure prevents moisture penetration, with a water absorption rate of ≤0.1%. When this material is combined with the tin-plated copper wire braided layer, a physical interlocking interface is formed through a hot-pressing process, preventing interlayer delamination. Within the cable's operating temperature range of 60-80℃, the sheath maintains its elastic deformation capacity, with a deformation recovery rate of ≥95%. When the external ambient humidity exceeds 85%, a hydrophobic film forms on the sheath surface, with a contact angle of ≥110°, preventing liquid water intrusion. The longitudinal flame-retardant performance of the sheath is tested according to GB / T18380.12 standard, with a horizontal burning distance of ≤250mm, and the burning drips did not ignite the degreased cotton below.

[0060] As a preferred embodiment, the solution of this application is implemented as follows: The water-blocking sleeve 7 is made of flame-retardant polyvinyl chloride (PVC). Flame-retardant PVC material has good water-blocking and flame-retardant properties. During the manufacturing process, the flame-retardant PVC material is extruded into a tubular structure and covered on the outside of the electromagnetic shielding layer 6. The thickness of the water-blocking sleeve 7 can be adjusted according to actual needs to ensure sufficient water-blocking and flame-retardant effects.

[0061] Through the above technical solutions, this application improves the waterproof performance of the cable, enhancing its safety and durability. The water-blocking sheath 7 effectively prevents moisture from penetrating into the cable's interior, preventing moisture from damaging the cable's internal structure. Simultaneously, the use of flame-retardant polyvinyl chloride material improves the cable's flame-retardant performance, reduces fire hazards, and enhances the cable's applicability and safety in high-end buildings.

[0062] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-end building heating cable, characterized in that: The device includes two symmetrically arranged heating conductors, with a convex-shaped high-temperature resistant insulating heat conductor I positioned between them. The two heating conductors are respectively positioned abutting against the left and right sides of the convex end of the high-temperature resistant insulating heat conductor I. An insulating block is provided inside the convex end of the high-temperature resistant insulating heat conductor I. A heat insulation layer is provided at the convex bottom of the high-temperature resistant insulating heat conductor I. An inverted U-shaped high-temperature resistant insulating heat conductor II is provided on the upper part of the two heating conductors. The two ends of the U-shape of the high-temperature resistant insulating heat conductor II are in contact with the surface of the heat insulation layer. An electromagnetic shielding layer is provided outside the annular structure formed by the high-temperature resistant insulating heat conductor II and the heat insulation layer. A water-blocking sheath is provided outside the electromagnetic shielding layer.

2. The high-grade building heating cable according to claim 1, characterized in that: The heating conductor is a carbon fiber heating element with a rectangular cross-section.

3. The high-end building heating cable according to claim 1, characterized in that: The high-temperature resistant insulating heat conductor one and the high-temperature resistant insulating heat conductor two are made of polytetrafluoroethylene.

4. The high-grade building heating cable according to claim 1, characterized in that: The insulating block is made of cross-linked polyethylene.

5. A high-grade building heating cable according to claim 1, characterized in that: The electromagnetic shielding layer is a braided layer of multi-strand tin-plated copper wire.

6. A high-end building heating cable according to claim 1, characterized in that: The water-blocking sheath shown is made of flame-retardant polyvinyl chloride.

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