Heat insulation type mineral insulation fireproof electric power signal composite cable

Abstract

The utility model discloses a heat insulation type mineral insulation fireproof electric power signal composite cable, comprising a plurality of insulation core wires which are enclosed to form a power cable with a center hole; each insulating core wire comprises a tile-shaped conductor, a mica tape wrapping layer wrapping the outer side of the tile-shaped conductor, and a cross-linked polyethylene insulating layer extruded on the outer side of the mica tape wrapping layer; the comprehensive signal cable is accommodated in the center hole and comprises a plurality of signal cables, a braided total shielding layer surrounding the signal cables, and a fireproof wrapping tape wrapping the outer side of the braided total shielding layer; a fireproof filling material is filled between the braided total shielding layer and each signal cable. And the fireproof outer wrapping layer wraps the outer side of the power cable. And the signal line is arranged at the innermost layer of the composite cable, so that the signal line can be effectively protected in a fire, and continuous and stable transmission of signals is kept. The cable has excellent fireproof performance, and is smokeless and nontoxic during combustion.

Description

Technical Field

[0001] The utility model relates to the field of cables, in particular to a heat-insulated mineral-insulated fireproof electric power signal composite cable. Background Art

[0002] Fireproof cable is a cable product with fireproof performance, mainly used for electrical wiring inside buildings, especially in places with high fire risks, such as commercial buildings, residential buildings, etc. The main function of fireproof cable is to prevent the spread of fire when a fire occurs, reduce the impact of fire on the electrical system, and protect the safety of life and property. Fireproof cable generally has high temperature resistance: fireproof cable can maintain good electrical performance under high temperature conditions and delay the spread of fire; fire resistance: can maintain electrical connection for a certain period of time in a fire.

[0003] The process structure of ordinary fire-resistant cables is to wrap mica tape around the cable conductor. This process can meet the fire resistance performance of power transmission cables, but for signal transmission cables, especially video surveillance lines, industrial buses and other signal transmission lines that have strict requirements on impedance, wrapping mica tape will change the cable impedance and make its performance substandard. Therefore, the mica tape wrapping process is not suitable for video surveillance lines or signal transmission cables.

[0004] Signal transmission cables, especially video surveillance cables and industrial buses, have strict impedance requirements. Due to their special process technology requirements, they cannot meet the fire resistance requirements. Therefore, the signal lines will lose their function within a short period of time after the fire starts and cannot operate normally. Firefighters will also be unable to accurately obtain fire information, affecting the development of firefighting and disaster relief.

[0005] Fireproof signal cables can ensure circuit integrity in fire or high temperature environments and ensure timely transmission of alarm signals, which is crucial for alarm systems because the particularity and importance of alarm systems require that the cables used must be highly reliable and safe. Fire-resistant signal cables can ensure that the lines are powered on normally within a certain period of time when a fire occurs, transmit various control signals, video signals, and alarm signals, and provide accurate information and guidance to the alarm center, thereby ensuring the safety of the detection system and personnel. Utility Model Content

[0006] The purpose of this utility model is to overcome the above defects. This utility model provides a thermal insulation mineral insulated fireproof power signal composite cable. The modified cable structure cleverly places the signal cable inside the fireproof power cable core, effectively ensuring that the signal line can continue to work at the fire scene, achieving the purpose of fire resistance. To achieve the above purpose, the technical solution of this utility model includes:

[0007] A thermally insulated mineral insulated fireproof power signal composite cable, comprising:

[0008] A plurality of insulating core wires are enclosed to form a power cable with a central hole; the insulating core wires include a tile-shaped conductor, a mica tape wrapping layer wrapped around the outer side of the tile-shaped conductor, and a cross-linked polyethylene insulation layer extruded outside the mica tape wrapping layer;

[0009] A comprehensive signal cable is accommodated in the central hole, comprising a plurality of signal cables, a braided overall shielding layer surrounding the signal cables, and a fire-resistant wrapping tape wrapped around the outer side of the braided overall shielding layer; a fire-resistant filling material is filled between the braided overall shielding layer and each signal cable;

[0010] The fireproof outer sheath is coated on the outside of the power cable.

[0011] A further improvement of the utility model lies in that the number of the insulating core wires is three or four.

[0012] A further improvement of the utility model is that the tile-shaped conductor is formed by twisting metal wires; and the cross section of the power cable is annular.

[0013] A further improvement of the utility model is that the signal cable in the integrated signal cable comprises a double-shielded network cable and a shielded signal cable.

[0014] A further improvement of the utility model is that the fireproof outer sheath comprises: a halogen-free, low-smoke, flame-retardant glass fiber tape covering the power cable, the halogen-free, low-smoke, flame-retardant glass fiber tape being covered with a protective layer formed by longitudinally wrapping and welding a corrugated aluminum tape, a polyethylene isolation layer being extruded outside the protective layer, a mixed fireproof mud layer being extruded outside the polyethylene isolation layer, a halogen-free, low-smoke, flame-retardant glass fiber layer being covered outside the mixed fireproof mud layer, and a halogen-free, low-smoke, flame-retardant polyolefin sheath layer being extruded outside the halogen-free, low-smoke, flame-retardant glass fiber layer.

[0015] The beneficial effects of the utility model include:

[0016] (1) The signal cables all adopt a shielding structure, which can effectively shield the magnetic field interference of the power cable during operation and improve the stability of signal transmission. The composite structure of signal cable and power cable makes the cable installation and maintenance more convenient and quick.

[0017] (2) The video surveillance line and signal transmission line are placed in the innermost layer of the composite cable, which can be effectively protected in a fire and maintain continuous and stable signal transmission.

[0018] (3) The composite cable has good fire resistance and adopts a multi-layer special fire-proof structure process. It can provide good protection for power transmission core wires, video transmission lines and signal transmission lines, ensuring that the cable can operate continuously within 90 minutes in a fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a cross-sectional schematic diagram of the thermal insulation type mineral insulated fireproof power signal composite cable of the utility model;

[0020] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 is a schematic cross-sectional view of an insulated core wire;

[0022] Figure 4 It is a cross-sectional schematic diagram of the integrated signal cable.

[0023] Wherein, the accompanying drawings are marked as follows:

[0024] 1. Tile-shaped conductor; 2. Mica tape wrapping layer; 3. Cross-linked polyethylene insulation layer; 4. Double-shielded network cable; 5. Shielded signal cable; 6. Fireproof filling material; 7. Braided overall shielding layer; 8. Fire-resistant wrapping tape; 9. Halogen-free low-smoke flame-retardant glass fiber tape; 10. Protective layer; 11. Polyethylene isolation layer; 12. Mixed fireproof mud layer; 13. Halogen-free low-smoke flame-retardant glass fiber layer; 14. Halogen-free low-smoke flame-retardant polyolefin sheath layer; 15. Insulated core wire; 16. Integrated signal cable; 17. Fireproof outer sheath. DETAILED DESCRIPTION

[0025] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0027] like Figure 1 As shown, the embodiment of the utility model provides a thermal insulation type mineral insulated fireproof power signal composite cable, which includes: an insulating core wire 15, a composite signal cable 16 and a fireproof outer sheath 17. Among them:

[0028] like Figure 1 , Figure 2 , Figure 3As shown, four insulating core wires 15 with fan-shaped cross sections are enclosed to form a power cable with a central hole. The insulating core wires 15 include a tile-shaped conductor 1, a mica tape wrapping layer 2 wrapped around the outer side of the tile-shaped conductor 1, and a cross-linked polyethylene insulation layer 3 extruded around the outer side of the mica tape wrapping layer 2. In other embodiments, the number of insulating core wires 15 can be three. The tile-shaped conductor 1 is formed by twisting metal wires; the cross section of the power cable is annular. The metal wire is a copper wire, which is made of electrical copper through a drawing process.

[0029] like Figure 1 , Figure 4 As shown, the integrated signal cable 16 is used to transmit digital signals or analog signals, and is accommodated in the center hole of the power cable. In this embodiment, the signal cable in the integrated signal cable 16 includes a double-shielded network cable 4 and a shielded signal cable 5. The integrated signal cable 16 also includes a braided total shielding layer 7 surrounding the signal cable, and a fire-resistant tape 8 wrapped around the outside of the braided total shielding layer 7; a fire-resistant filling material 6 is filled between the braided total shielding layer 7 and each signal cable. The material of the fire-resistant tape 8 is mica tape. The double-shielded network cable 4 can adopt network cables of various specifications, such as STP-CAT5E double-shielded network cable. The shielded signal cable 5 can adopt a signal transmission twisted pair. The braided total shielding layer 7 is formed by braiding metal wires and can shield external electromagnetic signals.

[0030] like Figure 1 , Figure 2 As shown, the fireproof outer sheath 17 is coated on the outside of the power cable. The fireproof outer sheath 17 comprises: a halogen-free low-smoke flame-retardant glass fiber tape 9 coating the power cable, the halogen-free low-smoke flame-retardant glass fiber tape 9 is coated with a protective layer 10 formed by longitudinally wrapping and welding a corrugated aluminum tape, the protective layer 10 is extruded with a polyethylene isolation layer 11, the polyethylene isolation layer 11 is extruded with a mixed fireproof mud layer 11, the mixed fireproof mud layer 11 is coated with a halogen-free low-smoke flame-retardant glass fiber layer 13, and the halogen-free low-smoke flame-retardant glass fiber layer 13 is extruded with a halogen-free low-smoke flame-retardant polyolefin sheath layer 14.

[0031] In the embodiment of the present invention, the materials and molding processes used in each layer of the cable are all existing materials and existing molding technologies, and this embodiment does not involve improvements in materials and processes. The environmental performance of the cable in this embodiment meets the requirements of cadmium and its compounds <100ppm; lead and its compounds <1000ppm; mercury and its compounds <1000ppm; hexavalent chromium compounds <1000ppm; polybrominated biphenyls PBB <1000ppm; polybrominated diphenyl ethers

[0032] PBDE<1000ppm.

[0033] The cable of this embodiment adopts the characteristics of the tile-shaped structure of the four-core cable conductor, and forms a hollow structure when cabled, so that the video surveillance line and the signal transmission line can be accommodated therein, so that ordinary video surveillance lines and signal transmission lines also have fireproof properties under the protection of the fireproof cable. In a fire, they can continuously transmit signals for a certain period of time, providing accurate information and guidance to the alarm center, thereby effectively carrying out rescue.

[0034] The cable of this embodiment adopts a multi-layer fireproof structure to ensure the fireproof performance of the cable, so that the power cable and signal cable in the composite cable can achieve a fireproof effect. Its performance far exceeds that of ordinary fire-resistant cables, filling a gap in the market.

[0035] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A thermal insulation type mineral insulated fireproof power signal composite cable, characterized in that include: A plurality of insulating core wires (15) are enclosed to form a power cable having a central hole; the insulating core wire (15) comprises a tile-shaped conductor (1), a mica tape wrapping layer (2) wrapped around the outside of the tile-shaped conductor (1), and a cross-linked polyethylene insulation layer (3) extruded around the outside of the mica tape wrapping layer (2); The integrated signal cable (16) is accommodated in the central hole, and comprises a plurality of signal cables, a braided overall shielding layer (7) surrounding the signal cables, and a fire-resistant wrapping tape (8) wrapped around the outside of the braided overall shielding layer (7); a fire-resistant filling material (6) is filled between the braided overall shielding layer (7) and each signal cable; A fireproof outer sheath (17) is coated on the outside of the power cable.

2. A thermally insulated mineral insulated fireproof power signal composite cable according to claim 1, characterized in that: The number of the insulating core wires (15) is three or four.

3. The thermally insulated mineral insulated fireproof power signal composite cable according to claim 1, characterized in that: The tile-type conductor (1) is formed by twisting metal wires; the cross section of the power cable is annular.

4. The thermally insulated mineral insulated fireproof power signal composite cable according to claim 1, characterized in that: The signal cable in the integrated signal cable (16) comprises a double-shielded network cable (4) and a shielded signal cable (5).

5. The thermally insulated mineral insulated fireproof power signal composite cable according to claim 1, characterized in that: The fireproof outer sheath (17) comprises: a halogen-free, low-smoke, flame-retardant glass fiber tape (9) covering the power cable; the halogen-free, low-smoke, flame-retardant glass fiber tape (9) is covered with a protective layer (10) formed by longitudinally wrapping and welding a ribbed aluminum tape; the protective layer (10) is extruded with a polyethylene isolation layer (11); the polyethylene isolation layer (11) is extruded with a mixed fireproof mud layer (12); the mixed fireproof mud layer (12) is covered with a halogen-free, low-smoke, flame-retardant glass fiber layer (13); the halogen-free, low-smoke, flame-retardant glass fiber layer (13) is extruded with a halogen-free, low-smoke, flame-retardant polyolefin sheath layer (14).

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