Flame-retardant fireproof power cable

Abstract

The utility model belongs to the technical field of cables, and particularly relates to a flame-retardant fireproof power cable, which comprises a cable core. A composite flame-retardant base layer, a microencapsulation protective layer and a composite flame-retardant outer layer are sequentially arranged on the outer side of the cable core from inside to outside to form a synergistic flame-retardant protective structure; the sheath is located outside the coating layer on the outermost circle of the cable core, a supporting piece is installed on the inner side of the sheath to dynamically bear pressure and buffer the cable core, and a connecting part is arranged at the end of the sheath and used for sealing the sheath which is closed to be circular. According to the utility model, the problems of poor flame-retardant aging and insufficient fire resistance of the cable are solved, and the internal structure of the cable can be preserved in emergency, so that the flame-retardant and fire-resistant functions of the cable can be stably exerted, and the use effect of the cable is improved.

Description

Technical Field

[0001] This utility model belongs to the field of cable technology, and in particular relates to a flame-retardant and fire-resistant power cable. Background Technology

[0002] Power cables are electrical transmission components used to transmit electrical energy. They are widely used in many large power-consuming places such as power plants, metallurgical and petroleum enterprises, undertaking important tasks such as transmitting and distributing electrical energy and transmitting information.

[0003] Currently, power cables are mostly installed in enclosed environments, which means that cables cannot be avoided in the event of a fire. However, most cables on the market use flame-retardant layers to resist high temperatures, but their flame-retardant effect is short-lived, resulting in poor fire resistance in the event of a fire, which is not conducive to their use.

[0004] To address the aforementioned problems, this application proposes a flame-retardant and fire-resistant power cable. Utility Model Content

[0005] The purpose of this invention is to provide a flame-retardant and fire-resistant power cable, which solves the problems mentioned in the background art.

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

[0007] This utility model relates to a flame-retardant and fire-resistant power cable, including a cable core;

[0008] The outer side of the cable core is provided with a composite flame-retardant base layer, a microencapsulated protective layer and a composite flame-retardant outer layer from the inside out, forming a synergistic flame-retardant protection structure;

[0009] The sheath is located outside the outermost layer of the cable core. Support members are installed on the inner side to provide dynamic pressure resistance and buffering for the cable core. The end of the sheath is provided with a connecting part to close the sheath into a circle.

[0010] Furthermore, the composite flame-retardant base layer is a composite flame retardant of zinc borate and magnesium hydroxide with a particle size of 50-100μm, which is wrapped around the cable core to form a base layer protection.

[0011] Furthermore, the microencapsulated protective layer is microencapsulated perfluorohexanone with a wall thickness of 5 μm, serving as a triggering component for the synergistic flame-retardant structure.

[0012] Furthermore, the composite flame-retardant outer layer is a composite coating composed of expanded graphite and ceramic precursor, with a thickness of 0.2 mm, and is a secondary flame-retardant component of the synergistic flame-retardant structure.

[0013] Furthermore, the composite coating of the composite flame-retardant outer layer expands to form a honeycomb-shaped heat insulation layer.

[0014] Furthermore, the support member is a nickel-titanium alloy spring with a wire diameter of 0.3 mm and a helix angle of 55°.

[0015] Furthermore, a positioning groove is provided on the outer side of the covering layer for engaging with the ring at the end of the support member.

[0016] Furthermore, a sealing plug 4 is installed in the gap between the sheath and the end of the covering layer to seal the internal space.

[0017] This utility model has the following beneficial effects:

[0018] This invention forms a base layer protection for the cable core by using a composite flame-retardant base layer. Then, a synergistic flame-retardant protective structure is formed by a microencapsulated protective layer and a composite flame-retardant outer layer. When the microencapsulated protective layer ruptures and releases perfluorohexanone, it triggers the expansion of the coating of the composite flame-retardant outer layer to form a honeycomb-shaped heat insulation layer. This effectively improves the flame-retardant effect and maintains the normal performance of the cable during this period.

[0019] This utility model, by combining the sheath and the support to form an external protective structure, can resist external extrusion pressure in all directions, especially resisting the impact of falling objects during a fire, so that the cable can maintain structural stability in emergency situations and ensure the stability of the internal flame-retardant function.

[0020] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. 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 overall appearance structure of this utility model;

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

[0024] Figure 3 This is a schematic diagram of the sheath portion of this utility model;

[0025] Figure 4 This is a schematic diagram of the cable cross-section structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the combined structure of the sheath and cable of this utility model;

[0027] The attached diagram lists the components represented by each number as follows:

[0028] In the diagram: 1. Cable core; 2. Sheath; 3. Sheath; 4. Sealing plug; 5. Composite flame-retardant base layer; 6. Microencapsulated protective layer; 7. Composite flame-retardant outer layer; 8. Positioning groove; 9. Support component; 10. Ring; 11. Connecting part. Detailed Implementation

[0029] 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.

[0030] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the parts 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.

[0031] Please see Figure 1-5 As shown, this utility model is a flame-retardant and fire-resistant power cable, including a cable core 1;

[0032] The outer side of the cable core 1 is provided with a composite flame-retardant base layer 5, a microencapsulated protective layer 6, and a composite flame-retardant outer layer 7 from the inside out, forming a synergistic flame-retardant protection structure.

[0033] The sheath 3 is located outside the outermost layer 2 of the cable core 1. The inner side is equipped with a support 9 to form dynamic pressure bearing and buffering for the cable core 1. The end of the sheath 3 is provided with a connecting part 11 to close the sheath 3 into a circle.

[0034] This embodiment provides a cable structure that can form a multi-layer flame-retardant protection for the cable core 1. The composite flame-retardant base layer 5 provides internal protection, while the microencapsulated protective layer 6 and the composite flame-retardant outer layer 7 work together to form flame retardancy on the outside, thereby improving the overall fire resistance of the cable and ensuring its stable performance in the event of a fire. In addition, the addition of the sheath 3 and the use of the support member 9 can provide multi-directional support and protection for the cable, resisting daily external pressure and impact from falling objects in emergency situations such as fires.

[0035] Among them, the composite flame-retardant base layer 5 is a composite flame retardant of zinc borate and magnesium hydroxide with a particle size of 50-100μm. It is wrapped around the core of the cable core 1 to form a base layer protection. In the event of a fire, it does not participate in external flame retardancy, but only forms real-time flame retardant protection for the cable core 1. It is the innermost protective component.

[0036] Among them, the microencapsulated protective layer 6 is microencapsulated perfluorohexanone with a wall thickness of 5μm. It is a triggering component of the synergistic flame retardant structure. When the external temperature reaches a predetermined value during a fire, it will first rupture and release the microencapsulated perfluorohexanone to form the first layer of external flame retardant protection.

[0037] Among them, the composite flame-retardant outer layer 7 is a composite coating composed of expanded graphite and ceramic precursor, with a thickness of 0.2mm. It is a secondary flame-retardant component of the synergistic flame-retardant structure. After being triggered by perfluorohexanone, the composite coating of the composite flame-retardant outer layer 7 expands to form a honeycomb heat insulation layer, increasing the flame-retardant protection surface while forming multi-directional protection.

[0038] Among them, the support component 9 is a nickel-titanium alloy spring with a wire diameter of 0.3mm and a helix angle of 55°, which can not only prevent external forces from directly penetrating inward, but also provide cushioning protection against externally dropped items.

[0039] The outer side of the covering layer 2 is provided with a positioning groove 8 for connecting with the ring 10 at the end of the support member 9, and the ring 10 is provided with a protruding structure inside, which is engaged with the inside of the positioning groove 8.

[0040] A sealing plug 4 is installed in the gap between the sheath 3 and the end of the covering layer 2 to seal the internal space.

[0041] Understandably, this utility model not only solves the problems of poor flame retardancy and insufficient fire resistance of cables, but also preserves the internal structure of cables in emergency situations, allowing their flame retardant and fire-resistant functions to be stably performed, thereby improving the performance of cables.

[0042] A specific application of the operation process in this embodiment is as follows: When the cable encounters a fire, the microencapsulated protective layer 6 in the middle layer ruptures and releases perfluorohexanone, which in turn triggers the expansion of the expanded graphite and ceramic precursor composite coating of the outer composite flame-retardant outer layer 7 to form a honeycomb-shaped heat insulation layer, thus forming a synergistic flame-retardant triggering mechanism, thereby increasing the flame-retardant effect of the cable and improving its fire resistance; In addition, the sheath 3 can be directly fitted on the outside when laying the cable and closed by the connecting part 11 so that the sheath 3 forms a circle. At this time, the protruding structure on the inner side of the ring 10 aligns with the positioning groove 8, thereby forming dynamic pressure through the support member 9 during daily use of the cable and in the event of a fire. This not only maintains the stability of the internal structure of the cable below the external compressive force, but also resists the impact of falling objects during a fire, ensuring the stable performance of the cable.

[0043] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., 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, the 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.

[0044] 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 fire-retardant fire-resistant power cable comprising a cable core (1), characterized in that: The outer side of the cable core (1) is sequentially provided with a composite fire-retardant base layer (5), a microencapsulated protective layer (6), and a composite fire-retardant outer layer (7) from inside to outside, forming a synergistic fire-retardant protection structure; A sheath (3) is located outside the outermost layer of the cable core (1), and a support member (9) is installed on the inner side to form dynamic pressure bearing and buffering for the cable core (1), and the end of the sheath (3) is provided with a connecting part (11) for closing the sheath (3) in a circular shape.

2. A fire and flame resistant power cable according to claim 1, characterised in that: The microencapsulated protective layer (6) is microencapsulated perfluorohexanone with a coating wall thickness of 5 μm, which is a triggering component of the synergistic fire-retardant structure.

3. A fire and flame resistant power cable according to claim 1, characterized in that: The composite fire-retardant outer layer (7) is a composite coating layer composed of expanded graphite and ceramic precursor with a thickness of 0.2 mm, which is a secondary fire-retardant component of the synergistic fire-retardant structure.

4. A fire and flame resistant power cable according to claim 3, characterised in that: The composite coating layer of the composite fire-retardant outer layer (7) forms a honeycomb heat insulation layer after expansion.

5. A fire and flame resistant power cable according to claim 1, characterized in that: The support member (9) is a nickel-titanium alloy spring with a wire diameter of 0.3 mm and a helix angle of 55°.

6. A fire and flame resistant power cable according to claim 1, characterized in that: The outer side of the coating layer (2) is provided with a positioning groove (8) for abutting the ring sleeve (10) at the end of the support member (9).

7. A fire and flame resistant power cable according to claim 1, characterized in that: A sealing plug (4) is installed in the gap between the sheath (3) and the end of the coating layer (2) to seal the internal space.

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