Lightweight fireproof cable

Abstract

The utility model discloses a lightweight fireproof cable, which comprises insulating core wires, four insulating core wires are twisted to form a cable core, an aluminum-plastic composite tape is wrapped on the cable core, a composite mica tape is wrapped on the aluminum-plastic composite tape, a fireproof sheath is extruded on the composite mica tape, the composite mica tape comprises a mica tape layer, a reinforcing tape layer and a functional tape layer, the reinforcing tape layer is compounded and adhered to the outer side surface of the mica tape layer, the functional tape layer is compounded and adhered to the inner side surface of the mica tape layer, during splicing, the reinforcing tape layer at the splicing end of one composite mica tape is exposed out of the mica tape layer, the functional tape layer is flush with the mica tape layer, the mica tape layer at the splicing end of the other composite mica tape is exposed out of the reinforcing tape layer, and the functional tape layer is flush with the mica tape layer. The functional tape layer is flush with the mica tape layer, and the reinforcing tape layer exposed on one composite mica tape is compounded and adhered with the mica tape layer exposed on the other composite mica tape. By using the composite mica tape, the overall weight and the manufacturing cost of the cable can be reduced, and good fireproof and heat-resistant effects can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of cables, and more particularly to lightweight fire-resistant cables. Background Technology

[0002] Fire-resistant cables are cables with special fire-resistant properties, mainly used in fire-prone environments such as high-rise buildings, underground facilities, oil platforms, subways, and nuclear power plants. These environments have extremely high requirements for the safety and reliability of power supply, thus necessitating the use of fire-resistant cables to ensure safety. Currently, most fire-resistant cables on the market achieve their fire resistance through an armor layer, typically made of tinned copper wire. While this provides fire protection, tinned copper wire has excellent thermal conductivity, transferring heat to the cable's interior at high temperatures, affecting its normal operation. Furthermore, the armor layer increases the cable's weight and rigidity, making installation more difficult. Utility Model Content

[0003] The purpose of this invention is to provide a lightweight fireproof cable that is lightweight and can still function normally at high temperatures.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a lightweight fireproof cable, comprising: an insulated core wire, four insulated core wires twisted into a cable core, an aluminum-plastic composite tape wrapped around the cable core, a composite mica tape wrapped around the aluminum-plastic composite tape, and a fireproof sheath extruded onto the composite mica tape. The composite mica tape comprises: a mica tape layer, a reinforcing tape layer, and a functional tape layer. The reinforcing tape layer is compositely bonded to the outer surface of the mica tape layer, and the functional tape layer is compositely bonded to the inner surface of the mica tape layer. During splicing, the reinforcing tape layer at the splicing end of one composite mica tape is exposed above the mica tape layer, and the functional tape layer is flush with the mica tape layer. The mica tape layer at the splicing end of another composite mica tape is exposed above the reinforcing tape layer, and the functional tape layer is flush with the mica tape layer. The reinforcing tape layer exposed on one composite mica tape is compositely bonded to the mica tape layer exposed on the other composite mica tape.

[0005] Furthermore, in the aforementioned lightweight fireproof cable, the reinforcing layer is made of fiberglass cloth, and the functional layer is any one of polyester film, polyimide film, or flexible rubber.

[0006] Furthermore, in the aforementioned lightweight fireproof cable, the insulated core wire comprises: a conductor, a mica tape, and a fireproof insulation layer, wherein the mica tape is wrapped around the conductor, and a fireproof insulation layer is extruded onto the mica tape, and the fireproof insulation layer is made of any one of the following materials: polyimide, polyetheretherketone, and cross-linked polyethylene.

[0007] Furthermore, in the aforementioned lightweight fireproof cable, the wrapping direction of the composite mica tape is opposite to that of the aluminum-plastic composite tape.

[0008] Furthermore, in the aforementioned lightweight fire-resistant cable, the fire-resistant sheath is made of low-smoke halogen-free flame-retardant material.

[0009] The advantages of this invention are as follows: Compared to tin-plated copper wire braided armor layers, composite mica tape is cheaper, lighter, and softer. While providing excellent fire resistance, composite mica tape also reduces the weight and stiffness of the cable. Furthermore, the mica tape layer within the composite mica tape has good heat insulation properties, protecting the cable's interior from external high temperatures during a fire and extending its normal operating time in high-temperature environments. By setting different functional layers, the composite mica tape can have different functions, making the cable suitable for various application scenarios. Replacing tin-plated copper wire braided tape with composite mica tape will... To ensure the cable's shielding performance, aluminum-plastic composite tape is wrapped around the cable core. When the composite mica tape breaks or is used up, it needs to be spliced. During splicing, the mica tape layer and functional tape layer at the splicing end of one composite mica tape are cut off to expose the reinforcing tape layer. The reinforcing tape layer at the splicing end of another composite mica tape is also cut off to expose the mica tape layer. The exposed reinforcing tape layer from one composite mica tape is then bonded to the exposed mica tape layer from the other composite mica tape, facilitating splicing and resulting in a high splicing strength. Attached Figure Description

[0010] Figure 1 This is a structural schematic diagram of the lightweight fireproof cable described in this utility model.

[0011] Figure 2 yes Figure 1 A schematic diagram of the structure when splicing composite mica tape. Detailed Implementation

[0012] The technical solution of this utility model will be further described below with reference to the accompanying drawings and preferred embodiments.

[0013] like Figure 1 , Figure 2As shown, the lightweight fireproof cable of this utility model includes: an insulated core wire 1, four insulated core wires 1 twisted together to form a cable core. The insulated core wire 1 includes: a conductor 11, a mica tape 12, and a fireproof insulation layer 13. The mica tape 12 is wrapped around the conductor 11, and the fireproof insulation layer 13 is extruded onto the mica tape 12. The mica tape 12 can prevent the conductor 11 from loosening and also play a role in heat insulation. The fireproof insulation layer 13 is made of any one of polyimide, polyetheretherketone, and cross-linked polyethylene. Polyimide has excellent heat resistance, with a long-term operating temperature range of -200℃ to 300℃, no obvious melting point, and can still maintain excellent mechanical and electrical insulation properties at high temperatures, and also has good mechanical properties. It can withstand a tensile force of approximately 100 MPa, making it suitable for applications requiring tensile strength. Polyetheretherketone (PEEK) has a long-term operating temperature of approximately 250°C and possesses good toughness, rigidity, self-lubrication, and abrasion resistance, helping to reduce friction and wear between the fire-resistant insulation layer 13 and the mica tape 12 during cable installation, bending, or movement, making it suitable for applications requiring frequent movement or bending. Cross-linked polyethylene (XLPE) remains stable above 100°C and does not decompose or carbonize below 300°C. Furthermore, XLPE has good oil and acid / alkali resistance, making it suitable for harsh environments such as chemical and petroleum industries. An aluminum-plastic composite tape 2 is wrapped around the cable core, and a composite mica tape 3 is wrapped around the aluminum-plastic composite tape 2. The wrapping direction is opposite to that of the aluminum-plastic composite tape 2. The composite mica tape 3 includes: a mica tape layer 31, a reinforcing tape layer 32, and a functional tape layer 33. The reinforcing tape layer 32 is bonded to the outer surface of the mica tape layer 31, and the functional tape layer 33 is bonded to the inner surface of the mica tape layer 31. The mica tape layer 31 has excellent heat resistance, arc resistance, and superior mechanical strength. The mica tape layer 31 can maintain good electrical and insulation properties at high temperatures and also has good heat resistance. In the event of a fire, it can protect the inside of the cable from the influence of external high temperatures and extend the normal operating time of the cable in high-temperature environments. The reinforcing tape layer 32 can improve the strength of the composite mica tape 3. The reinforcing tape layer 32 is made of glass fiber. Fiberglass cloth, a commonly used reinforcing material, can further improve the mechanical strength and heat resistance of the cable after being composited and bonded with the mica tape layer 31, making the cable suitable for high-temperature environments or applications requiring high strength. The functional tape layer 33 can be made of different materials depending on the actual application. The functional tape layer 33 can be any one of polyester film, polyimide film, or flexible rubber. Polyester film has good electrical insulation properties and low cost. After being composited and bonded with the mica tape layer 31, it can provide an additional insulation layer and is suitable for medium and low voltage environments. Polyimide film has excellent heat resistance and chemical resistance. After being composited and bonded with the mica tape layer 31, it is suitable for high-temperature and high-voltage environments, such as aerospace and military fields.Flexible rubber possesses excellent flexibility and corrosion resistance. When bonded to the mica tape layer 31, it enhances the cable's flexibility and environmental resistance. A fire-resistant sheath 4 is extruded onto the composite mica tape 3. This fire-resistant sheath 4 is made of low-smoke, halogen-free flame-retardant material. This type of material is resistant to heat aging, acids and alkalis, water, and high temperatures, and has good flame retardancy, enabling the cable to operate normally in a fire.

[0014] During the wrapping process, composite mica tape 3 may break or require splicing, necessitating the splicing of two composite mica tapes 3. This requires structural modification of the composite mica tape 3. First, the splicing ends of both composite mica tapes 3 are cut flush with a cutter. Then, the mica tape layer 31 and functional tape layer 33 at the splicing end of one composite mica tape 3 are removed, allowing the reinforcing tape layer 32 to extend beyond the mica tape layer 31. Similarly, the reinforcing tape layer 32 at the splicing end of the other composite mica tape 3 is removed, again allowing the mica tape layer 31 and functional tape layer 33 to extend beyond the reinforcing tape layer 32. The removed lengths of both composite mica tapes 3 are the same. Finally, the reinforcing tape layer 32 at the splicing end of one composite mica tape 3 is bonded together using adhesive or ultrasonic welding. The mica tape layer 31 is adhered to the splice end of another composite mica tape 3. Since the cut lengths at the splice ends of the two composite mica tapes 3 are the same, the reinforcing tape layers 32, mica tape layers 31, and functional tape layers 33 on the two composite mica tapes 3 are all spliced ​​and abutted together during composite bonding. In this way, when the adhesive is used for connection, the adhesive fills the splice gap, so that the reinforcing tape layers 32, mica tape layers 31, and functional tape layers 33 on the two composite mica tapes 3 are bonded together at the same time, which improves the splice strength. When using ultrasonic welding, the reinforcing tape layers 32, mica tape layers 31, and functional tape layers 33 on the two composite mica tapes 3 can be ultrasonically welded firmly, which can also improve the splice strength.

[0015] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. Lightweight fire resistant cable, characterized in that: The application relates to an insulated core wire, four insulated core wires are twisted into a cable core, an aluminum-plastic composite tape is wrapped on the cable core, a composite mica tape is wrapped on the aluminum-plastic composite tape, and a fireproof sheath is extruded on the composite mica tape, the composite mica tape comprises a mica tape layer, a reinforcing tape layer and a functional tape layer, the reinforcing tape layer is compounded and adhered on the outer side of the mica tape layer, the functional tape layer is compounded and adhered on the inner side of the mica tape layer, during connection, the reinforcing tape layer at the connecting end of one composite mica tape is exposed from the mica tape layer, the functional tape layer is flush with the mica tape layer, the mica tape layer at the connecting end of another composite mica tape is exposed from the reinforcing tape layer, the functional tape layer is flush with the mica tape layer, and the exposed reinforcing tape layer on one composite mica tape is compounded and adhered with the exposed mica tape layer on another composite mica tape. The reinforcing tape layer is glass fiber cloth, and the functional tape layer is any one of polyester film, polyimide film and flexible rubber.

2. The lightweight fire resistant cable of claim 1, wherein: The insulated core wire comprises a conductor, a mica tape and a fireproof insulation layer, the mica tape is wrapped on the conductor, and the fireproof insulation layer is extruded on the mica tape and is made of any one of polyimide, polyether ether ketone and cross-linked polyethylene.

3. The lightweight fire resistant cable of claim 1, wherein: The wrapping direction of the composite mica tape is opposite to that of the aluminum-plastic composite tape.

4. The lightweight fire resistant cable of claim 1, wherein: The fireproof sheath is made of low-smoke halogen-free flame-retardant material.

5. The lightweight fire resistant cable of claim 1, wherein: ​

Images