Halogen-free flame-retardant flexible fire resistant cable

Abstract

The utility model discloses a kind of halogen-free flame-retardant flexible fireproof cables, the surface of core body is extruded and wrapped with insulating layer, the surface of insulating layer is sleeved with shielding layer, the surface of shielding layer is installed with inner protective layer, the surface of inner protective layer is fixedly installed with heat insulation layer, heat insulation cavity is equidistantly opened in the inside of heat insulation layer along circumference direction, anti-collapse support rubber block is equidistantly fixedly installed in the inside of heat insulation cavity, the utility model is cooperated with the use of heat insulation layer and heat insulation cavity, the heat of outside has played the role of isolation, heat insulation cavity keeps sealed state in cable interior, so that gas cannot flow, and then reduce the transmission efficiency of heat, to core body has played certain heat insulation protection effect, simultaneously, anti-collapse support rubber block is used to support heat insulation cavity, prevent cable from being pressed after heat insulation layer deformation leads to heat insulation cavity being pressed flat and affecting normal heat insulation protection, anti-collapse support rubber block effectively maintains the integrity of heat insulation cavity.

Description

Technical Field

[0001] This utility model relates to the field of fireproof cable technology, specifically to a halogen-free flame-retardant flexible fireproof cable. Background Technology

[0002] A cable is an electrical or signal transmission device, typically composed of several or groups of conductors. The manufacturing process of cables differs significantly from that of most electromechanical products. Electromechanical products are usually produced by assembling individual components into parts, and then assembling multiple parts into a single unit, with products measured in units or pieces. Cables, however, are measured by length. All cable production begins with conductor processing, adding layers of insulation, shielding, cabling, and sheathing around the conductor to create the cable product. The more complex the product structure, the more layers are added. Flame-retardant cables refer to cables that, under specified test conditions, withstand combustion. A halogen-free flame-retardant cable is a cable whose flame spread is limited to a certain range after the test fire source is removed, and whose residual flame or embers can extinguish themselves within a limited time. The fundamental characteristic of a halogen-free flame-retardant cable is that it may be burned and unable to operate in the event of a fire, but it can prevent the spread of fire. It is widely used in occasions that require high safety and environmental protection. Its main characteristics include low smoke, halogen-free, flame retardant and fire resistant. Low smoke and halogen-free means that the cable sheath is made of halogen-free materials (such as polyolefin-based materials), and will not release toxic hydrogen halide gas when burning. Flame retardancy and fire resistance ensure that the cable can maintain a certain integrity and operating time in the event of a fire.

[0003] However, currently, cables are always in a fire environment during the flame-retardant and fireproofing process. The fire environment contains a lot of heat, and the cable has poor heat insulation, which causes a lot of heat to be transferred to the core inside the cable. This can easily cause the core to fail to operate normally in a very short time. Therefore, this utility model provides a halogen-free flame-retardant flexible fireproof cable to meet people's needs. Utility Model Content

[0004] This invention provides a halogen-free flame-retardant flexible fireproof cable, which can effectively solve the problem mentioned in the background art that the cable itself is always in a fire environment during the flame-retardant and fireproof process. The fire environment has a large amount of heat, and the cable has poor heat insulation, which causes a large amount of heat to be transferred to the core inside the cable, making it easy for the core to fail to operate normally in a very short time.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a halogen-free flame-retardant flexible fireproof cable, comprising a core, an insulation layer extruded and wrapped on the surface of the core, a shielding layer sleeved on the surface of the insulation layer, an inner protective layer sleeved on the surface of the shielding layer, a heat insulation layer fixedly installed on the surface of the inner protective layer, and heat insulation cavities equidistantly formed along the circumferential direction inside the heat insulation layer, with anti-collapse support rubber blocks fixedly installed equidistantly inside the heat insulation cavities;

[0006] A buffer layer is fitted onto the surface of the heat insulation layer. Arc-shaped metal strips are equidistantly attached to the surface of the buffer layer along the circumferential direction. A molded sleeve is fitted onto the outer side of the buffer layer. An outer protective layer is wrapped around the surface of the molded sleeve. A halogen-free, low-smoke flame-retardant layer is fitted onto the outer wall of the outer protective layer.

[0007] Preferably, a rubber strip is fixedly installed between adjacent heat insulation cavities, and the top and bottom ends of the anti-collapse support rubber block are respectively attached to the two inner walls of the heat insulation layer.

[0008] Preferably, the edges of adjacent curved metal strips are fitted together, and the inner wall of the shaping sleeve is tightly attached to the outer wall of the curved metal strip.

[0009] Preferably, the surface of the halogen-free low-smoke flame-retardant layer is provided with annular mounting grooves at equal intervals, and an arc-shaped positioning block is embedded in the bottom of the annular mounting groove. Supporting diagonal rods are symmetrically fixedly connected to both ends of the bottom of the arc-shaped positioning block, and a support block is fixedly connected to the bottom end of the supporting diagonal rod.

[0010] Preferably, the thickness of the arc-shaped positioning block is greater than the depth of the annular mounting groove, and the horizontal height of both ends of the top of the arc-shaped positioning block is higher than the horizontal height of the center position of the core.

[0011] Compared with the prior art, the advantages of this utility model are: the structure of this utility model is scientific and reasonable, and it is safe and convenient to use.

[0012] 1. Equipped with a heat insulation layer, a heat insulation cavity, and anti-collapse support rubber blocks, the heat insulation layer and the heat insulation cavity work together to isolate external heat. The heat insulation cavity remains sealed inside the cable, preventing gas flow and reducing heat transfer efficiency, thus providing a certain degree of heat insulation protection for the core. At the same time, the anti-collapse support rubber blocks support the heat insulation cavity, preventing the heat insulation layer from deforming under pressure and causing the heat insulation cavity to be flattened, affecting normal heat insulation protection. The anti-collapse support rubber blocks effectively maintain the integrity of the heat insulation cavity.

[0013] 2. It is equipped with arc-shaped metal flexible strips and a shaping sleeve. The arc-shaped metal flexible strips are spliced ​​together and wrapped around the inside of the cable. The fire-retardant properties of the metal are used to improve the flame-retardant properties of the cable and prevent external fires from damaging the cable core. At the same time, the shaping sleeve plays a role in shaping and limiting the arc-shaped metal flexible strips, preventing the arc-shaped metal flexible strips from tilting and shifting and affecting the normal protection function.

[0014] 3. It is equipped with an annular mounting groove, an arc-shaped positioning block, a support diagonal rod, and a support block. The annular mounting groove and the arc-shaped positioning block work together to position the support diagonal rod, so that the support diagonal rod is located at the bottom of the cable, which provides support and protection for the cable as a whole and improves the stability of the cable installation. At the same time, the arc-shaped positioning block can rotate inside the annular mounting groove, which makes it easy to adjust the position of the support diagonal rod and the support block to adapt to the angle and position of the cable installation. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0016] In the attached diagram:

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic cross-sectional view of the cable of this utility model;

[0019] Figure 3 This is a schematic diagram of the installation structure of the inner protective layer of this utility model;

[0020] Figure 4 This is a schematic diagram of the installation structure of the arc-shaped metal flexible strip of this utility model;

[0021] The following are the labels in the diagram: 1. Core; 2. Insulation layer; 3. Shielding layer; 4. Inner protective layer; 5. Heat insulation layer; 6. Heat insulation cavity; 7. Anti-collapse support rubber block; 8. Buffer layer; 9. Arc-shaped metal strip; 10. Molded sleeve layer; 11. Outer protective layer; 12. Halogen-free low-smoke flame retardant layer; 13. Annular mounting groove; 14. Arc-shaped positioning block; 15. Supporting diagonal rod; 16. Support block. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Example: Figure 1-4As shown, this utility model provides a technical solution: a halogen-free flame-retardant flexible fireproof cable, comprising a core 1, an insulation layer 2 extruded and wrapped around the surface of the core 1, the insulation layer 2 being made of insulating rubber, a shielding layer 3 sleeved on the surface of the insulation layer 2, the shielding layer 3 being made of copper braided mesh, an inner protective layer 4 sleeved and installed on the surface of the shielding layer 3, a heat insulation layer 5 fixedly installed on the surface of the inner protective layer 4, heat insulation cavities 6 evenly spaced along the circumferential direction inside the heat insulation layer 5, anti-collapse support rubber blocks 7 evenly fixedly installed inside the heat insulation cavities 6, and rubber strips fixedly installed between adjacent heat insulation cavities 6, the rubber strips protecting the interior of the heat insulation layer 5. The cable is divided into multiple heat-insulating cavities 6 at equal intervals. The top and bottom of the anti-collapse support rubber block 7 are respectively attached to the two inner walls of the heat insulation layer 5. Through the combined use of the heat insulation layer 5 and the heat-insulating cavities 6, the heat from the outside is isolated. The heat-insulating cavities 6 are kept sealed inside the cable, so that gas cannot flow, thereby reducing the heat transfer efficiency and providing a certain degree of heat insulation protection for the core 1. At the same time, the anti-collapse support rubber block 7 supports the heat-insulating cavities 6 to prevent the heat insulation layer 5 from deforming after the cable is compressed, which would cause the heat-insulating cavities 6 to be flattened and affect the normal heat insulation protection. The anti-collapse support rubber block 7 effectively maintains the integrity of the heat-insulating cavities 6.

[0024] A buffer layer 8, made of silicone, is fitted onto the surface of the heat insulation layer 5. Curved metal strips 9 are equidistantly attached to the surface of the buffer layer 8 along the circumferential direction. A molded sleeve 10 is fitted onto the outer side of the buffer layer 8, with the edges of adjacent curved metal strips 9 fitting together. The inner wall of the molded sleeve 10 is tightly attached to the outer wall of the curved metal strips 9. An outer protective layer 11 is then installed over the surface of the molded sleeve 10. Both the inner protective layer 4 and the outer protective layer 11 are made of high-temperature and corrosion-resistant extruded rubber. The outer protective layer 11 is fitted with a halogen-free low-smoke flame-retardant layer 12. The halogen-free low-smoke flame-retardant layer 12 is made of halogen-free materials (such as polyolefin-based materials). It is spliced ​​together by arc-shaped metal flexible strips 9 and wrapped around the inside of the cable. The fire-retardant properties of the metal are used to improve the flame-retardant properties of the cable and prevent external fire from damaging the cable core 1. At the same time, the shaping sleeve 10 plays a shaping and limiting role for the arc-shaped metal flexible strips 9, preventing the arc-shaped metal flexible strips 9 from tilting and shifting and affecting the normal protective function.

[0025] The surface of the halogen-free low-smoke flame-retardant layer 12 is provided with equidistant annular mounting grooves 13. An arc-shaped positioning block 14 is embedded in the bottom of the annular mounting groove 13. Supporting diagonal rods 15 are symmetrically fixed to both ends of the bottom of the arc-shaped positioning block 14. Supporting blocks 16 are fixedly connected to the bottom ends of the supporting diagonal rods 15. The thickness of the arc-shaped positioning block 14 is greater than the depth of the annular mounting groove 13. The horizontal height of both ends of the top of the arc-shaped positioning block 14 is higher than the horizontal height of the center position of the core 1. By using the annular mounting groove 13 and the arc-shaped positioning block 14 in cooperation, the position of the supporting diagonal rod 15 is positioned so that the supporting diagonal rod 15 is located at the bottom of the cable, which plays a supporting and protective role for the cable as a whole and improves the stability of the cable installation. At the same time, the arc-shaped positioning block 14 can rotate inside the annular mounting groove 13, which makes it easy to adjust the position of the supporting diagonal rod 15 and the supporting block 16 to adapt to the angle and position of the cable installation.

[0026] The working principle and usage process of this utility model are as follows: First, when installing the cable, the staff lays and places the cable as a whole. The arc-shaped positioning block 14 can rotate inside the annular mounting groove 13. Adjusting the position of the arc-shaped positioning block 14 so that the support rod 15 and the support block 16 are both located below the cable. The support block 16 contacts the installation plane, and the support rod 15 plays a supporting and stabilizing role for the entire cable, making the cable installation more stable.

[0027] When the cable is in operation, external fires can damage the cable. When the halogen-free low-smoke flame-retardant layer 12 is ignited, it does not release hydrogen halide gas and produces less smoke. It also has certain flame-retardant properties and can remain intact for a period of time in a fire. If the fire lasts for a long time, the halogen-free low-smoke flame-retardant layer 12, the outer protective layer 11, and the plastic sleeve layer 10 will be ignited in sequence. The arc-shaped metal soft strip 9 surrounds and splices the cable, which plays a certain role in isolating and protecting the remaining cable surface, so that open flames cannot directly ignite the internal structure of the cable.

[0028] When the cable is in a fire environment, the heat generated by the fire source will be transferred into the cable. The heat insulation layer 5 and the heat insulation cavity 6 form multiple sealed cavities in the core 1. The heat insulation cavity 6 remains sealed, and the gas inside does not flow, which effectively reduces the heat transfer and reduces the heat transfer from the external environment to the core 1. As a result, the core 1 can still operate normally and provide sufficient time for firefighters to extinguish and repair the fire. At the same time, the anti-collapse support rubber block 7 plays a supporting and stabilizing role for the heat insulation cavity 6, preventing the heat insulation layer 5 from being flattened when the cable is under pressure, which would cause the heat insulation cavity 6 to lose its integrity. The anti-collapse support rubber block 7 buffers and supports the external pressure.

[0029] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A halogen-free flame-retardant flexible fireproof cable, comprising a core (1), characterized in that: The core (1) is covered with an insulating layer (2) by extrusion, and a shielding layer (3) is sleeved on the surface of the insulating layer (2). An inner protective layer (4) is sleeved on the surface of the shielding layer (3). A heat insulation layer (5) is fixedly installed on the surface of the inner protective layer (4). Heat insulation cavities (6) are equidistantly opened in the circumferential direction inside the heat insulation layer (5). Anti-collapse support rubber blocks (7) are fixedly installed equidistantly inside the heat insulation cavities (6). The surface of the heat insulation layer (5) is fitted with a buffer layer (8), and the surface of the buffer layer (8) is fitted with arc-shaped metal strips (9) at equal intervals along the circumferential direction. The outer side of the buffer layer (8) is fitted with a shaping sleeve (10), and the surface of the shaping sleeve (10) is wrapped with an outer protective layer (11). The outer wall of the outer protective layer (11) is fitted with a halogen-free low-smoke flame-retardant layer (12).

2. The halogen-free flame-retardant flexible fireproof cable according to claim 1, characterized in that, A rubber strip is fixedly installed between adjacent heat insulation cavities (6), and the top and bottom ends of the anti-collapse support rubber block (7) are respectively attached to the two inner walls of the heat insulation layer (5).

3. The halogen-free flame-retardant flexible fireproof cable according to claim 1, characterized in that, The edges of adjacent curved metal strips (9) are attached to each other, and the inner wall of the shaping sleeve (10) is tightly attached to the outer wall of the curved metal strip (9).

4. The halogen-free flame-retardant flexible fireproof cable according to claim 1, characterized in that, The surface of the halogen-free low-smoke flame retardant layer (12) is provided with annular mounting grooves (13) at equal intervals. An arc-shaped positioning block (14) is embedded in the bottom of the annular mounting groove (13). A support rod (15) is symmetrically fixedly connected to both ends of the bottom of the arc-shaped positioning block (14). A support block (16) is fixedly connected to the bottom end of the support rod (15).

5. A halogen-free flame-retardant flexible fireproof cable according to claim 4, characterized in that, The thickness of the arc-shaped positioning block (14) is greater than the depth of the annular mounting groove (13), and the horizontal height of both ends of the top of the arc-shaped positioning block (14) is higher than the horizontal height of the center position of the core (1).

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