Copper core mica tape mineral insulated aerogel filled corrugated copper sheath cable

Abstract

The utility model relates to the field of cables, and provides a copper core mica tape mineral insulation aerogel filled corrugated copper sheath cable. The RTTZ cable aims to solve the problem that a traditional RTTZ cable is insufficient in mechanical performance and thermal stability in a high-temperature environment. According to the specific scheme, the cable comprises a cable core (1), an aerogel glass fiber tape wrapping layer (2), a filling structure (3), a halogen-free low-smoke flame-retardant glass cloth tape cabling wrapping layer (4), a silicon dioxide aerogel filling layer (5) and an outer corrugated copper sheath (6) which are sequentially arranged from inside to outside. Compared with the prior art, the utility model has the advantages that the mechanical strength, the fireproof performance, the heat-resistant performance and the flame-retardant performance of the cable are improved, the simplicity of the structure and the rationality of the design are maintained, and the cable has better fireproof performance and reliability in extreme environments such as fire disasters and the like.

Description

Technical Field

[0001] The invention relates to the field of cables and provides a copper core mica tape mineral insulated aerogel filled corrugated copper sheathed cable. Background Art

[0002] Copper core mica tape mineral insulated corrugated copper sheathed power cables are widely used in places that require high fire safety protection, such as subways, tunnels, high-rise buildings, petrochemicals, nuclear power plants, etc. These places have high requirements for the fire resistance and reliability of cables, and mineral insulated fireproof cables can provide more reliable power supply and safety protection. At the same time, RTTZ cable (copper core mica tape mineral insulated corrugated copper sheathed power cable) as a commonly used power transmission line has excellent electrical properties, such as low dielectric constant and high conductivity. However, traditional RTTZ cables have deficiencies in mechanical properties and thermal stability. Especially in high temperature environments, cables are easily affected by thermal stress, resulting in performance degradation. Therefore, it is necessary to improve RTTZ cables to improve their mechanical properties and thermal stability, so that they can continue to operate for a longer time when a fire occurs.

[0003] Disadvantages of traditional technology and their causes:

[0004] The disadvantages are:

[0005] 1. There is a certain gap between the winding layer and the corrugated copper sheath of ordinary RTTZ, so there is room for improvement in fire protection ability;

[0006] 2. In high temperature environments, cables are susceptible to thermal stress, resulting in performance degradation.

[0007] Cause: There are gaps in the cable corrugated structure, which lacks fire resistance and reliability. Summary of the invention

[0008] This utility model technology aims to solve the problem of insufficient mechanical performance and thermal stability of traditional RTTZ cables in high temperature environments. By filling silica aerogel between the cable's sheath and the corrugated copper sheath, the cable's fire resistance, flame retardancy, and thermal insulation properties are improved while maintaining its excellent electrical properties. This filling method enhances the cable's compressive strength and rigidity, reduces the cable's weight, and effectively improves the cable's service life and safety performance in high temperature environments.

[0009] In order to achieve the above purpose, the utility model adopts the following technical means:

[0010] The present invention provides a copper core mica tape mineral insulated aerogel filled corrugated copper sheathed cable, comprising a wire core, wherein the number of wire cores is 3, each wire core is independently sheathed with an aerogel glass fiber tape sheathing layer, a filling structure is arranged between the wire cores sheathed with the aerogel glass fiber tape sheathing layer, and then a halogen-free low-smoke flame-retardant glass cloth tape cabling sheathing layer, a silica aerogel filling layer and an outer corrugated copper sheath are arranged in sequence from the inside to the outside.

[0011] In the above scheme, the filling structure adopts silica aerogel glass fiber felt.

[0012] In the above scheme, the halogen-free low-smoke flame-retardant glass cloth tape cabling sheath comprises a glass cloth tape substrate and a halogen-free flame retardant coated on the glass cloth tape substrate.

[0013] In the above solution, the aerogel glass fiber tape wrapping layer comprises a glass fiber tape on which aerogel material is coated or impregnated.

[0014] The utility model aims to solve the shortcomings of traditional RTTZ cables in mechanical properties and thermal stability, especially the performance degradation problem in high temperature environment. The technology uses silica aerogel to fill the gap between the sheath and the outer corrugated copper sheath of the corrugated copper sheathed cable, achieving the following technical effects:

[0015] Improved mechanical properties: The filling of silica aerogel enhances the rigidity and deformation resistance of the cable, making it less likely for the cable to dent or deform when subjected to external forces, thereby improving the mechanical properties of the cable.

[0016] Enhanced fire resistance: The high melting point of silica aerogel (greater than 1700 degrees Celsius) significantly improves the fire resistance of the cable, allowing the cable to maintain the stability of its structure and performance under high temperature conditions, far exceeding the tolerance of traditional RTTZ cables.

[0017] Improved heat resistance: The heat resistance temperature range of silica aerogel is generally above 800 degrees Celsius, which effectively isolates the high temperature generated when the conductor is short-circuited, thereby improving the heat resistance and safety of the cable.

[0018] Improved flame retardancy and thermal insulation performance: The filling of silica aerogel glass fiber felt not only improves the flame retardancy of the cable, but also reduces the overall weight of the cable due to its lower density and has good thermal insulation performance.

[0019] Cost control: By controlling the amount of silica aerogel added, the utility model technology effectively controls the production cost while ensuring the mechanical properties, thermal stability and electrical properties of the cable.

[0020] Compared with the prior art, the advantages of the technology of the utility model are mainly reflected in improving the mechanical strength, fire resistance, heat resistance and flame retardancy of the cable, while maintaining the simplicity of the structure and the rationality of the design, so that the cable has better fire resistance and reliability in extreme environments such as fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the utility model structure. DETAILED DESCRIPTION

[0022] The following is a detailed description of the embodiments of the present invention. Although the present invention will be described and illustrated in conjunction with some specific embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, modifications or equivalent substitutions made to the present invention should all be included in the scope of the claims of the present invention.

[0023] In addition, in order to better illustrate the present invention, numerous specific details are given in the following specific embodiments. It will be understood by those skilled in the art that the present invention can also be implemented without these specific details.

[0024] The present invention provides a copper core mica tape mineral insulated aerogel filled corrugated copper sheathed cable, comprising 3 wire cores, wherein the wire cores include a copper conductor and 4 layers of aerogel glass fiber tape sheathing 2, a filling structure 3 formed by silica aerogel glass fiber felt, a halogen-free low-smoke flame-retardant glass cloth tape cabling sheathing 4, silica aerogel filling 5, and an outer corrugated copper sheath 6.

[0025] The utility model uses silica aerogel to fill between the cabling wrapping layer 4 and the outer corrugated copper sheath 6, removing the gap of the traditional RTTZ structure, making the overall structure more compact, and the copper sheath is not easy to dent or deform when subjected to external force. At the same time, compared with the traditional RTTZ structure, the additional silica aerogel filling layer structure can effectively protect the core wire, thereby increasing the normal operation time of the cable when a fire occurs.

[0026] The utility model changes the traditional flame retardant high temperature filling into silica aerogel glass fiber felt 3 filling. The silica aerogel glass fiber felt has good thermal insulation, heat resistance and flame retardant properties and has a low density. It can improve the heat resistance and reduce the overall weight of the cable.

[0027] In the production process, silica aerogel is first prepared by an existing mature preparation method and compressed into a filling layer of the desired shape. Then, the filling layer is filled between the cabling sheath 4 and the outer corrugated copper sheath 6 of the RTTZ cable. Finally, through appropriate process treatment, the silica aerogel is firmly combined with the cable material to form a filling structure.

[0028] Ordinary RTTZ can withstand 1000 degrees Celsius in the event of a fire, while silica aerogel has a higher melting point, generally above 1700 degrees Celsius, and can maintain the stability of its structure and performance under high temperature conditions, thereby improving the fire resistance of RTTZ. The maximum conductor temperature of RTTZ is 90°C during normal operation and 250°C during short circuit, while the heat-resistant temperature range of silica aerogel is generally above 800 degrees Celsius, which can improve the flame retardant and thermal insulation properties of RTTZ.

[0029] The filling layer is filled between the wrapping layer and the corrugated copper sheath of the RTTZ cable, which enhances the compressive strength of the cable. The addition of silica aerogel reduces the thermal conductivity of the cable, thereby improving the heat resistance of the cable. In high temperature environments, the thermal stress of the cable is effectively relieved, which increases its service life. By controlling the amount of silica aerogel added, the mechanical properties and thermal stability of the cable can be guaranteed while maintaining its excellent electrical properties.

[0030] Compared with the prior art, the utility model technology has the following advantages:

[0031] 1. The rigidity and flame retardant properties of the filled cable are improved;

[0032] 2. Using silica aerogel filling, its high melting point can greatly improve the fire resistance of the cable;

[0033] 3. Silica aerogel has a high heat resistance and can effectively isolate the high temperature generated when the conductor is short-circuited, thus improving the safety performance of the cable itself;

[0034] 4. Using silica aerogel glass fiber mat filling can improve flame retardant performance and reduce cable weight;

[0035] 5. The utility model has a simple structure and reasonable design. It adopts filling materials with excellent performance to improve the fire resistance, flame retardancy and heat insulation performance of RTTZ, and has better fire resistance and reliability when a fire occurs.

Claims

1. A copper core mica tape mineral insulated aerogel filled corrugated copper sheathed cable, characterized in that: The invention comprises a wire core (1), wherein the number of the wire cores (1) is 3, each wire core (1) is independently sheathed with an aerogel glass fiber tape sheath (2), a filling structure (3) is arranged between the wire cores (1) sheathed with the aerogel glass fiber tape sheath (2), and then a halogen-free low-smoke flame-retardant glass cloth tape cable sheath (4), a silica aerogel filling layer (5), and an outer corrugated copper sheath (6) are arranged in sequence from the inside to the outside.

2. A copper core mica tape mineral insulated aerogel filled corrugated copper sheathed cable according to claim 1, characterized in that: The filling structure (3) is made of silica aerogel glass fiber felt.

3. The copper core mica tape mineral insulated aerogel filled corrugated copper sheathed cable according to claim 1, characterized in that: The halogen-free low-smoke flame-retardant glass cloth tape cabling sheath (4) comprises a glass cloth tape base and a halogen-free flame retardant coated on the glass cloth tape base.

4. The copper core mica tape mineral insulated aerogel filled corrugated copper sheathed cable according to claim 1, characterized in that: The aerogel glass fiber tape wrapping layer (2) comprises a glass fiber tape on which an aerogel material is coated or impregnated.

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