Marine flame-retardant low-smoke halogen-free cable

Abstract

The utility model relates to the technical field of flame -retardant cable provides a marine flame -retardant low smoke halogen -free cable, including cable core and insulating layer and sheath layer, the cable core is located cable center, sheath layer is located cable most outer layer, and the insulating layer is established in the outside of cable core, the outside of insulating layer is equipped with heat insulating layer, the outside of heat insulating layer is equipped with the channel of spiral extension, the outside of heat insulating layer is equipped with flame -retardant layer, is the independent metal pipe of multiple sections, the flame -retardant layer includes breathable film and the flame -retardant powder filled in its side. Through the prefabricated flame -retardant layer installation in the inner layer of sheath layer, when encountering fire, flame -retardant powder expands by heat, thereby fills the wave valley area of flame -retardant layer, forms the flame -retardant wall of multiple sections radial, utilizes the channel to deliver part of the expanded flame -retardant powder to the other unburned area of cable simultaneously, reaches the effect of strengthening flame -retardant performance, after this arrangement, can form flame -retardant and can prevent the spread of flame, reduces the loss of cable.

Description

Technical Field

[0001] This utility model relates to the field of flame-retardant cable technology, and more specifically, to a marine flame-retardant low-smoke halogen-free cable. Background Technology

[0002] Marine flame-retardant low-smoke halogen-free cable is a high-performance safety cable that integrates environmental resistance, flame retardancy, low smoke, halogen-free and non-toxic properties. It is the "lifeline" for the electrification of modern ships and many important facilities. Its core design concept is to maximize the protection of human life and control property loss in extreme situations (especially in fire).

[0003] Currently, most flame-retardant cables on the market achieve flame retardancy by selecting materials and relying on the high-temperature resistance of the cable materials themselves. However, the flame-retardant effect is limited and cannot guarantee the safety of the cables in a fire.

[0004] To address the aforementioned issues, this application proposes a marine flame-retardant low-smoke halogen-free cable. Utility Model Content

[0005] The purpose of this invention is to provide a marine flame-retardant low-smoke halogen-free cable, which solves the problem of limited flame-retardant performance of existing cables.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] A marine flame-retardant low-smoke halogen-free cable includes a cable core, an insulation layer, and a sheath layer.

[0008] The cable core is located at the center of the cable, the sheath layer is located at the outermost layer of the cable, and the insulation layer is located on the outside of the cable core.

[0009] A heat insulation layer is provided on the outside of the insulating layer, and a spirally extending groove is formed on the outside of the heat insulation layer;

[0010] The outer side of the heat insulation layer is provided with a flame retardant layer, which is a multi-segment independent metal tube. The flame retardant layer includes a breathable membrane and flame retardant powder filled on its sides.

[0011] The flame-retardant layer has a reinforcing layer on the outside, which is spirally wrapped to form a covering.

[0012] Preferably, there are at least two channels, and the two channels rotate in opposite directions, forming a multi-segment cross-channel structure on the outside of the insulation layer.

[0013] Preferably, the flame-retardant layer includes a corrugated tube, and the breathable membranes are attached in pairs to the inner and outer surfaces of the corrugated tube.

[0014] Preferably, the flame-retardant powder is located on one side of the breathable membrane near the corrugated pipe.

[0015] Preferably, the flame-retardant powder comprises 75% expandable graphite, 20% ammonium polyphosphate and 5% aluminum hydroxide.

[0016] Preferably, fixing blocks are fixed at both ends of the corrugated pipe and the breathable membrane, and adhesive is provided on the inner side of the fixing blocks.

[0017] Preferably, the reinforcing layer has elastic ribs embedded inside.

[0018] The beneficial effects of this utility model are:

[0019] 1. By setting a flame-retardant layer inside the sheath layer, and utilizing the expansion characteristics of the flame-retardant powder, the gaps between the flame-retardant layer and the sheath layer and the heat insulation layer are filled after being heated, forming a multi-segment radial flame-retardant partition wall, thereby achieving the effect of preventing the flame from burning and spreading continuously.

[0020] 2. By spirally opening the channels, the flame-retardant powder in the inner layer expands and spreads along the channels, thereby covering other areas of the cable. This provides flame retardancy to unburned areas, enhancing the flame-retardant performance of other areas of the cable and reducing the risk of combustion. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the cable according to this utility model;

[0023] Figure 2 This is a schematic diagram of the cable cross-section structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the outer structure of the heat insulation layer of this utility model;

[0025] Figure 4 This is a schematic diagram of the reinforcing layer structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the flame-retardant layer structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of the flame-retardant layer of this utility model;

[0028] The attached diagram lists the components represented by each number as follows:

[0029] In the diagram: 1. Cable core; 2. Insulation layer; 3. Heat insulation layer; 31. Channel; 4. Flame retardant layer; 41. Corrugated pipe; 42. Breathable membrane; 421. Flame retardant powder; 43. Fixing block; 5. Sheath layer; 6. Reinforcing layer; 61. Elastic rib. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be understood that the terms "opening", "top and bottom", "thickness", "top", "middle", "length", "inner" and "around" indicate the orientation or positional relationship only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] A marine flame-retardant low-smoke halogen-free cable is designed to enhance the flame-retardant performance of the cable. By installing a prefabricated flame-retardant layer 4 inside the sheath layer 5, when a fire occurs, the flame-retardant powder 421 expands due to heat, thereby filling the trough area of ​​the flame-retardant layer 4 and forming multiple radial flame-retardant walls. At the same time, the channel 31 is used to transfer some of the expanded flame-retardant powder 421 to other unburned areas of the cable, thereby enhancing the flame-retardant performance. After this arrangement, it can both form flame retardancy and prevent the spread of flames, reducing cable loss.

[0033] In some embodiments, the specific structure of the marine flame-retardant low-smoke halogen-free cable is as follows: Figure 1-6 As shown, it includes, from the inside out, the cable core 1, the insulation layer 2, and the sheath layer 5;

[0034] An insulating layer 3 is provided on the outside of the insulating layer 2, which is made of solid ceramicized silicone rubber or high-performance mica tape wrapped around it;

[0035] Among them, the outer side of the heat insulation layer 3 is provided with a groove 31, which is a spiral-shaped groove structure, formed by the internal protrusion of the rotating die core during the extrusion molding of the heat insulation layer 3;

[0036] Optionally, multiple channels 31 are provided, in pairs, with each pair including two channels 31 rotating in opposite directions;

[0037] It should be noted that at room temperature, channel 31 is a heat diffusion channel used to conduct internal heat axially in a spiral manner to a relatively low temperature area, thereby preventing overheating in some areas.

[0038] It is understandable that the heat insulation layer 3 can block the high temperature from the outside and prevent it from directly affecting the internal cable core 1, thereby reducing the loss of the cable core 1 in the event of a fire.

[0039] A flame-retardant layer 4 is provided on the outside of the heat insulation layer 3. It is a metal corrugated pipe structure, which includes multiple independent pipes arranged at equal intervals along the axis.

[0040] The flame-retardant layer 4 includes a corrugated pipe 41 and a breathable membrane 42, and the breathable membrane 42 is attached to the inner and outer surfaces of the corrugated pipe 41.

[0041] Furthermore, fixing blocks 43 are fixedly installed at both ends of the corrugated pipe 41 and the breathable membrane 42;

[0042] Furthermore, the side of the breathable membrane 42 that is close to the corrugated pipe 41 is filled with flame retardant powder 421, which is a heat-expanding flame retardant powder composed of 75% expandable graphite, 20% ammonium polyphosphate and 5% aluminum hydroxide, and has multiple functions such as rapid high expansion, efficient char formation and heat absorption and cooling.

[0043] It should be noted that the corrugated pipe 41 is preferably made of aluminum alloy or tin-plated copper, the breathable membrane 42 is preferably a polytetrafluoroethylene microporous membrane, and the fixing block 43 is preferably made of flame-retardant nylon or flame-retardant polypropylene by injection molding.

[0044] Understandably, the corrugated structure of flame-retardant layer 4 can enhance the cable's resistance to external forces, thereby protecting the integrity of the cable structure when subjected to impacts and compression from external objects.

[0045] It is also understandable that when a fire occurs or the cable comes into contact with an open flame, the flame-retardant powder 421 expands when heated and can pass through the breathable membrane 42 to fill the trough of the corrugated pipe, forming a radially closed flame-retardant wall structure.

[0046] In addition, some of the flame retardant powder 421 expands and enters the channel 31. Under the thrust generated by the expansion, it flows spirally along the channel 31, thereby covering more areas for flame retardant protection.

[0047] A reinforcing layer 6 is provided on the outside of the flame retardant layer 4. It is installed by spiral winding and is made of mica tape or polyimide film tape.

[0048] The flame-retardant layer 4 has a corrugated tube 41 embedded inside, which can be single or multiple evenly distributed. Silicone rubber elastic strips or fluororubber elastic strips are selected to enhance the structural stability of the flame-retardant layer 4. The extruded sheath layer 5 ensures the integrity of the structure of the flame-retardant layer 4.

[0049] When manufacturing cables, the flame retardant layer 4 is a prefabricated part, which is rectangular in shape. After the heat insulation layer 3 is extruded, it is attached to the outside of the heat insulation layer 3. The rectangular flame retardant layer 4 is surrounded by an external shaping mold to form a tube structure. Then, EVA hot melt adhesive powder is used as an adhesive on the inside of the fixing block 43 to fix the flame retardant layer 4 to the outside of the heat insulation layer 3. After the reinforcing layer 6 is wrapped around the outside of the flame retardant layer 4, they are fed into the extrusion machine to manufacture the outermost sheath layer 5, thus obtaining a cable containing the flame retardant layer 4 and the reinforcing layer 6.

[0050] It should also be noted that the cable core 1 is made of multiple annealed soft copper wires twisted together in layers to ensure its conductivity and flexibility. The insulation layer 2 is preferably cross-linked polyethylene, and the sheath layer 5 is preferably flame-retardant low-smoke halogen-free polyolefin.

[0051] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A marine flame-retardant low-smoke halogen-free cable, characterized in that: It includes a cable core (1), an insulation layer (2), and a sheath layer (5); The cable core (1) is located at the center of the cable, the sheath layer (5) is located at the outermost layer of the cable, and the insulation layer (2) is located on the outside of the cable core (1); The outer side of the insulating layer (2) is provided with a heat insulation layer (3), and the outer side of the heat insulation layer (3) is provided with a spirally extending channel (31). The heat insulation layer (3) is provided with a flame retardant layer (4) on the outside, which is a multi-segment independent metal tube. The flame retardant layer (4) includes a breathable membrane (42) and flame retardant powder (421) filled on its side. The flame-retardant layer (4) is provided with a reinforcing layer (6) on the outside, which is spirally wrapped to form a covering.

2. The marine flame-retardant low-smoke halogen-free cable according to claim 1, characterized in that: There are at least two channels (31), and the two channels (31) rotate in opposite directions, forming a multi-segment cross-channel structure on the outside of the insulation layer (3).

3. The marine flame-retardant low-smoke halogen-free cable according to claim 1, characterized in that: The flame-retardant layer (4) includes a corrugated pipe (41), and the breathable membranes (42) are attached in pairs to the inner and outer surfaces of the corrugated pipe (41).

4. The marine flame-retardant low-smoke halogen-free cable according to claim 3, characterized in that: The flame-retardant powder (421) is located on one side of the breathable membrane (42) near the corrugated pipe (41).

5. The marine flame-retardant low-smoke halogen-free cable according to claim 3, characterized in that: The corrugated pipe (41) and the breathable membrane (42) are fixed with fixing blocks (43) at both ends, and the inner side of the fixing blocks (43) is provided with adhesive.

6. The marine flame-retardant low-smoke halogen-free cable according to claim 1, characterized in that: The reinforcing layer (6) has an elastic rib (61) embedded inside.

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