Low smoke zero halogen cable
By filling aerogel powder into the insulation sleeve of the low-smoke halogen-free cable with filling holes, combined with the heat insulation performance of ceramicized silicone, the problem of large smoke volume during cable combustion is solved, achieving lower smoke emissions and higher escape safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI CHENAN OPTOELECTRONICS CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-06-02
AI Technical Summary
Existing low-smoke halogen-free cables still produce a significant amount of smoke when burning, which is difficult to reduce further, affecting personnel escape and the normal operation of fire-fighting equipment.
The heat insulation sleeve is made of ceramicized silicone and has filling holes on its outer circumference. The filling holes are filled with aerogel powder, and the aerogel powder is encapsulated by an encapsulation film to improve heat insulation performance and smoke adsorption capacity.
It effectively reduces the amount of smoke when cables burn, improving escape safety and the working efficiency of fire-fighting equipment.
Smart Images
Figure CN224318189U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power cable technology, and in particular to a low-smoke halogen-free cable. Background Technology
[0002] Low-smoke halogen-free cables are environmentally friendly cables that produce low smoke and no halogen gases when burned, and are widely used in places with high safety and environmental protection requirements. When burning, low-smoke halogen-free cables produce very little smoke and have high light transmittance, which helps people escape in a fire and reduces interference with fire-fighting equipment. However, how to further reduce the amount of smoke produced when cables burn still needs further research. Summary of the Invention
[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a low-smoke halogen-free cable, which aims to reduce the smoke effect when the cable is burning.
[0004] Technical solution: To achieve the above objectives, this utility model provides a low-smoke halogen-free cable, comprising, from the inside out, a cable core, a filling layer, a wrapping layer, a heat insulation sleeve, a metal shielding layer, and an outer sheath; the outer peripheral surface of the heat insulation sleeve is provided with a plurality of filling holes, the filling holes being filled with a porous adsorption structure for adsorbing smoke; the outer peripheral surface of the heat insulation sleeve is also covered with an encapsulation film, the encapsulation film encapsulating the porous adsorption structure within the filling holes.
[0005] Furthermore, the heat insulation sleeve is made of ceramicized silicone.
[0006] Furthermore, the porous adsorption structure is an aerogel.
[0007] Furthermore, the encapsulation film is a silicone film.
[0008] Furthermore, the cable core is composed of several stranded wires, each wire including an inner conductor and an outer insulating sleeve.
[0009] Furthermore, the conductor is made of twisted copper wire, and the insulating sleeve is made of XLPE.
[0010] Furthermore, the filling layer is PP filling rope.
[0011] Furthermore, the wrapping layer is made of cotton paper.
[0012] Furthermore, the metal shielding layer is formed by wrapping copper strips.
[0013] Furthermore, the outer sheath is made of FRPE.
[0014] Beneficial effects: The present invention provides a low-smoke halogen-free cable with a heat insulation sleeve made of ceramicized silicone inside. The outer circumference of the heat insulation sleeve has filling holes filled with aerogel powder. The aerogel powder can not only improve the heat insulation performance of the ceramicized silicone, but also adsorb the smoke particles generated by combustion through its porous structure, further reducing the smoke effect and facilitating the escape of people in a fire. Attached Figure Description
[0015] Appendix Figure 1 This is a schematic diagram of the cable structure of this utility model. Detailed Implementation
[0016] The present invention will be further described below with reference to the accompanying drawings.
[0017] As attached Figure 1 The low-smoke halogen-free cable includes, from the inside out, a cable core, a filling layer 2, a wrapping layer 3, a heat insulation sleeve 4, a metal shielding layer 5, and an outer sheath 6. The heat insulation sleeve 4 is made of ceramicized silicone and has several filling holes 7. These filling holes 7 are filled with a porous adsorption structure for adsorbing smoke; specifically, the porous adsorption structure is aerogel, or more specifically, aerogel powder. Several filling holes 7 are correspondingly disposed on the outer peripheral surface of the heat insulation sleeve 4. An encapsulation film 8 covers the outer peripheral surface of the heat insulation sleeve 4, encapsulating the aerogel powder within the filling holes 7, thereby locking the position of the aerogel powder. In one embodiment, the encapsulation film 8 is a silicone film.
[0018] The insulation sleeve 4, made of a single ceramicized silicone, will ceramicize upon exposure to high temperatures, forming a hard ceramic layer that effectively insulates heat and provides good insulation. However, its smoke absorption is poor. Aerogel, as one of the best insulation materials, when filled into the filling holes 7, not only inhibits heat conduction but also impedes convection and radiation, further enhancing its insulation effect. Furthermore, the porous structure of aerogel allows it to absorb smoke particles generated during combustion, further reducing smoke and facilitating escape during a fire.
[0019] If the heat insulation sleeve 4 is made entirely of ceramicized silicone, the smoke adsorption effect will be poor. If the heat insulation sleeve 4 is made entirely of aerogel, due to the high brittleness and low compressive strength of aerogel, the aerogel may collapse at high temperatures, leading to a sharp drop in heat insulation performance. Furthermore, a single aerogel layer is also prone to decomposition and detachment due to vibration or bending. Therefore, both single ceramicized silicone heat insulation sleeves 4 and single aerogel heat insulation sleeves 4 have their shortcomings. The heat insulation sleeve 4 of this invention combines ceramicized silicone and aerogel, which improves smoke adsorption capacity while also possessing good strength properties.
[0020] Specifically, the cable core is composed of several stranded cores 1, each core 1 including an inner conductor 9 and an outer insulating sleeve 10. The conductor 9 is made of stranded copper wire. The insulating sleeve 10 is made of XLPE, or cross-linked polyethylene. The filling layer 2 is PP filling rope. The wrapping layer 3 is cotton paper. The metal shielding layer 5 is made of copper tape. The outer sheath 6 is made of FRPE, or flame-retardant polyethylene, which has good flame-retardant properties.
[0021] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A low-smoke halogen-free cable, characterized in that: The cable core, filling layer (2), wrapping layer (3), heat insulation sleeve (4), metal shielding layer (5) and outer sheath (6) are arranged sequentially from the inside to the outside. The heat insulation sleeve (4) has several filling holes (7) on its outer peripheral surface. The filling holes (7) are filled with a porous adsorption structure for adsorbing smoke. The heat insulation sleeve (4) is also covered with an encapsulation film (8), which encapsulates the porous adsorption structure in the filling holes (7).
2. The low-smoke halogen-free cable according to claim 1, characterized in that: The heat insulation sleeve (4) is made of ceramicized silicone.
3. The low-smoke halogen-free cable according to claim 1, characterized in that: The porous adsorption structure is an aerogel.
4. The low-smoke halogen-free cable according to claim 1, characterized in that: The encapsulation film (8) is a silicone film.
5. The low-smoke halogen-free cable according to claim 1, characterized in that: The cable core is formed by twisting together several wire cores (1), each wire core (1) including an inner conductor (9) and an outer insulating sleeve (10).
6. The low-smoke halogen-free cable according to claim 5, characterized in that: The conductor (9) is made of twisted copper wire, and the insulating sleeve (10) is made of XLPE.
7. The low-smoke halogen-free cable according to claim 1, characterized in that: The filling layer (2) is PP filling rope.
8. The low-smoke halogen-free cable according to claim 1, characterized in that: The wrapping layer (3) is cotton paper.
9. A low-smoke halogen-free cable according to claim 1, characterized in that: The metal shielding layer (5) is made of copper strip wrapped around it.
10. A low-smoke halogen-free cable according to claim 1, characterized in that: The outer sheath (6) is made of FRPE.