Sheath structure of high temperature resistant fireproof cable

Abstract

The utility model provides a kind of sheath structure of high-temperature-resistant fireproof cable, including outer sheath, fireproof layer, inner insulating layer, wire, elastic sealing ring and fireproof filler. Outer sheath is made of ceramic fireproof rubber, can form ceramic protective layer under high temperature, enhance high-temperature-resistant performance;Fireproof layer uses fireproof paint, expands and foams to form heat-insulating foam layer when on fire, effectively blocks flame and heat transfer;Inner insulating layer is coated with high-temperature-resistant insulating paint, to ensure the insulation performance of wire;Elastic sealing ring closely fits wire, to prevent foreign matter from entering;Fill cavity with ceramic fiber cotton and other fireproof fillers, to further improve fireproof capability. Outer sheath is designed as cylindrical, one end is open and provided with internal thread, the other end is closed, outer wall has heat dissipation hole, for easy installation and heat dissipation. Wire is twisted from copper wire, evenly distributed inside inner insulating layer, to ensure electrical conductivity and mechanical strength.

Description

Technical Field

[0001] This utility model provides a sheath structure, belonging to the technical field of high-temperature fireproof cable, and particularly relates to a sheath structure for a high-temperature fireproof cable. Background Technology

[0002] Traditional cable sheaths typically consist of an outer sheath and an inner insulation layer. The outer sheath serves as the outer layer of protection for the cable, and its main function is to resist external physical damage and some environmental factors. The inner insulation layer is responsible for ensuring insulation between conductors, preventing current leakage, and ensuring the basic power transmission function of the cable.

[0003] Most existing cable sheaths use ordinary rubber or plastic as the outer sheath material, with the inner insulation layer made of conventional insulating materials. While this structure can meet the daily operating requirements of general cables, it has significant drawbacks when facing high-temperature and flame environments. Ordinary outer sheath materials have limited high-temperature resistance and are prone to softening, deformation, or even melting at high temperatures, thus losing their protective function; the inner insulation layer also lacks fire-retardant capabilities and cannot prevent the spread of fire inside the cable. Utility Model Content

[0004] In order to solve the above problems, this application provides a sheath structure for a high-temperature fire-resistant cable, which solves the problem of insufficient protection of existing cable sheaths in high-temperature and flame environments.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a sheath structure for a high-temperature fireproof cable, comprising an outer sheath, a fireproof layer inside the outer sheath, an inner insulation layer inside the fireproof layer, a plurality of conductors inside the inner insulation layer, an elastic sealing ring outside the conductors, a filling cavity formed between the elastic sealing ring and the inner wall of the inner insulation layer, the filling cavity being filled with fireproof filler, the outer sheath being made of a high-temperature resistant material, the fireproof layer being made of a fireproof material, the inner insulation layer being made of an insulating material, the elastic sealing ring being made of an elastic material, and the fireproof filler being made of a fireproof material, the outer sheath, the fireproof layer, the inner insulation layer, the elastic sealing ring, and the fireproof filler working together to form a multi-layer protective structure to achieve high-temperature fireproof function.

[0006] Preferably, the outer sheath is a cylindrical structure with one end open and the other end closed. The inner wall of the open end of the outer sheath is provided with internal threads, and the outer wall of the outer sheath is provided with several heat dissipation holes.

[0007] Preferably, the fireproof layer is annular and tightly adheres to the inner wall of the outer sheath, and the fireproof layer contains a number of fireproof particles.

[0008] Preferably, the inner insulating layer has a cylindrical structure with one end open and the other end closed, and the inner wall of the open end of the inner insulating layer is provided with internal threads.

[0009] Preferably, the conductor is cylindrical and evenly distributed inside the inner insulation layer. The conductor is made of several stranded copper wires. The elastic sealing ring is sleeved on the outside of the conductor and is tightly fitted to the conductor.

[0010] Preferably, the fireproof filler in the filling cavity is ceramic fiber cotton.

[0011] Preferably, the high-temperature resistant material of the outer sheath is ceramicized fire-retardant rubber, which forms a ceramicized protective layer at high temperatures to enhance the high-temperature resistance of the sheath structure.

[0012] Preferably, the fireproof material of the fireproof layer is a fireproof coating, which is applied to the inner wall of the outer sheath to achieve fire protection for the sheath structure.

[0013] Preferably, the insulating material of the inner insulating layer is a high-temperature resistant insulating varnish, which is coated on the outer wall of the inner insulating layer to achieve insulation protection for the conductor.

[0014] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: This utility model utilizes a multi-layered protective structure, with the outer sheath made of high-temperature resistant material, the fireproof layer made of fireproof material, the inner insulation layer made of insulating material, the elastic sealing ring made of elastic material, and the fireproof filler made of fireproof material. The outer sheath, fireproof layer, inner insulation layer, elastic sealing ring, and fireproof filler work together to form a multi-layered protective structure. The outer sheath, as the outermost protective structure, is made of high-temperature resistant material to prevent direct contact between external high temperatures and the internal structure. The fireproof layer, made of fireproof material, effectively blocks flames and heat transfer, preventing damage to the internal structure. The inner insulation layer, made of insulating material, ensures the insulation performance between the conductors, guaranteeing the normal use of the cable. The elastic sealing ring, made of elastic material, fits tightly against the conductors, preventing the entry of external substances and forming a filling cavity with the inner insulation layer. The fireproof filler, made of fireproof material, fills the filling cavity, further enhancing fire resistance. This multi-layered protective structure achieves both high-temperature resistance and fireproofing, while also possessing the basic functions of existing cables, such as current transmission and insulation protection.

[0015] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0016] Figure 1 This is an overall cross-sectional view of the sheath structure of a high-temperature fireproof cable according to this utility model. Figure 2 This is a partial cross-sectional view of the sheath structure of a high-temperature fireproof cable according to this utility model; Figure 3 This is a cross-sectional view of the end face of the sheath structure of a high-temperature fireproof cable according to this utility model. Figure 4 This is an exploded view of the sheath structure of a high-temperature fireproof cable according to this utility model.

[0017] As shown in the figure: 1. Outer sheath; 2. Fireproof layer; 3. Inner insulation layer; 4. Wire; 5. Elastic sealing ring; 6. Filling cavity; 7. Fireproof filler; 201. Fireproof granules. Detailed Implementation

[0018] 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.

[0019] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] like Figure 1 and Figure 2As shown, a high-temperature fire-resistant cable sheath structure includes an outer sheath 1, a fire-resistant layer 2 inside the outer sheath 1, an inner insulation layer 3 inside the fire-resistant layer 2, a plurality of conductors 4 inside the inner insulation layer 3, and an elastic sealing ring 5 on the outer side of each conductor 4. A filling cavity 6 is formed between the elastic sealing ring 5 and the inner wall of the inner insulation layer 3, and the filling cavity 6 is filled with fire-resistant filler 7. The outer sheath 1 is made of a high-temperature resistant material, the fire-resistant layer 2 is made of a fire-resistant material, the inner insulation layer 3 is made of an insulating material, the elastic sealing ring 5 is made of an elastic material, and the fire-resistant filler 7 is made of a fire-resistant material. The outer sheath 1, fire-resistant layer 2, inner insulation layer 3, elastic sealing ring 5, and fire-resistant filler 7 cooperate to form a multi-layer protective structure to achieve high-temperature fire resistance. The fire-resistant layer 2 is annular and tightly adheres to the inner wall of the outer sheath 1, and contains a plurality of fire-resistant particles 201. The fireproof filler 7 filling the filling cavity 6 is ceramic fiber cotton, which can effectively retard flame and insulate heat.

[0022] In this implementation scheme, the outer sheath 1, as the outermost layer of the entire cable sheath structure, is made of high-temperature resistant material, which can effectively prevent external high temperatures from directly contacting the internal structure and protect the internal components from high-temperature damage. The fireproof layer 2 is annular and tightly adheres to the inner wall of the outer sheath 1. The fireproof layer 2 contains several fireproof particles 201. These fireproof particles 201 can quickly take effect when encountering a fire source, effectively blocking the transfer of flames and heat, preventing the fire from spreading to the internal structure, and enhancing the fire resistance of the cable.

[0023] The inner insulation layer 3, located inside the fireproof layer 2, is made of insulating material and ensures the insulation performance between the conductors 4. This guarantees the safety and stability of current transmission during cable use and avoids electrical faults such as short circuits caused by poor insulation. The conductors 4 are evenly distributed inside the inner insulation layer 3 and are composed of several stranded copper wires. This structure ensures the cable's conductivity while also providing a certain degree of flexibility and mechanical strength, allowing the cable to adapt to different installation environments and usage conditions.

[0024] An elastic sealing ring 5 is provided on the outer side of the conductor 4. The elastic sealing ring 5 is made of elastic material and can tightly fit the conductor 4 to prevent external moisture, dust and other foreign objects from entering the cable and damaging the conductor 4 and internal structure. It also plays a role in buffering and shock absorption, improving the service life and reliability of the cable. A filling cavity 6 is formed between the elastic sealing ring 5 and the inner wall of the inner insulation layer 3. The filling cavity 6 is filled with fire-retardant filler 7. The fire-retardant filler 7 is made of fire-retardant material, which further enhances the fire resistance of the cable. Even in high temperature or flame environment, it can effectively prevent the spread of fire inside the cable, providing additional protection for the normal operation of the cable.

[0025] In summary, the sheath structure of this high-temperature fire-resistant cable achieves excellent high-temperature fire resistance through the coordinated use of multiple protective layers, including the outer sheath 1, fire-resistant layer 2, inner insulation layer 3, elastic sealing ring 5, and fire-resistant filler 7, while ensuring the cable's basic functions such as current transmission and insulation protection. This structural design not only improves the cable's safety and reliability in harsh environments such as high temperatures and flames but also extends its service life and reduces maintenance costs, demonstrating significant practical value and market competitiveness.

[0026] like Figure 3 and Figure 4 As shown, a high-temperature fire-resistant cable sheath structure is characterized by: the outer sheath 1 being a cylindrical structure with one open end and the other closed; the inner wall of the open end of the outer sheath 1 having internal threads; and the outer wall of the outer sheath 1 having several heat dissipation holes. The inner insulation layer 3 is a cylindrical structure with one open end and the other closed; the inner wall of the open end of the inner insulation layer 3 having internal threads. The conductor 4 is cylindrical and evenly distributed inside the inner insulation layer 3; the conductor 4 is composed of several stranded copper wires; and the elastic sealing ring 5 is fitted onto the outside of the conductor 4, and the elastic sealing ring 5 is tightly fitted to the conductor 4. The high-temperature resistant material of the outer sheath 1 is ceramicized fire-retardant rubber, which forms a ceramicized protective layer at high temperatures to enhance the high-temperature resistance of the sheath structure. The fire-retardant material of the fireproof layer 2 is fire-retardant coating, which is applied to the inner wall of the outer sheath 1 to achieve fire protection for the sheath structure. The insulating material of the inner insulation layer 3 is high-temperature resistant insulating varnish, which is coated on the outer wall of the inner insulation layer 3 to achieve insulation protection for the conductor 4.

[0027] In this implementation plan, the existing technical solutions and methods mainly focus on the selection and application of high-temperature resistant and fire-resistant materials. Ceramicized fire-resistant rubber, used as the outer sheath material, has a relatively mature preparation and processing technology and can be produced using conventional rubber processing equipment and processes to form an outer sheath with high-temperature resistance. Fire-retardant coating is applied to the outer wall of the inner insulation layer using common spraying or brushing processes to ensure uniform coating and strong adhesion, thereby achieving fire protection. The installation method of the elastic sealing ring is also based on existing technology, using interference fit or snap-fit ​​to fix it at a suitable position between the wire and the inner insulation layer to ensure a sealing effect.

[0028] In use, under high-temperature or flame environments, the outer sheath of this device first utilizes ceramicized fire-retardant rubber material to block heat intrusion. This material forms a ceramicized protective layer at high temperatures, providing a robust physical barrier. Simultaneously, the fire-retardant coating of the fire-retardant layer expands and foams upon heating, forming a heat-insulating foam layer, further blocking heat transfer. Fire-retardant fillers such as ceramic fiber cotton within the filling cavity effectively absorb and disperse heat, preventing the internal structure temperature from rising. Elastic sealing rings prevent external high-temperature gases and flames from entering through the gaps between the conductors, protecting the internal conductors and insulation layer. The inner insulation layer uses high-temperature resistant insulating varnish, ensuring that the conductors maintain good insulation performance under high-temperature environments, preventing short circuits and electrical faults. The heat dissipation holes on the outer sheath help dissipate internal heat during normal operation, but in high-temperature environments, they may become channels for heat intrusion. In this case, the fire-retardant layer and the fire-retardant fillers within the filling cavity play a crucial role in preventing heat from entering the cable through the heat dissipation holes. The coordinated action of these structures ensures that the cable maintains normal function and ensures safety in high-temperature or flame environments.

[0029] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A sheath structure for a high-temperature resistant fireproof cable, characterized in that: The device includes an outer sheath (1), a fireproof layer (2) inside the outer sheath (1), an inner insulation layer (3) inside the fireproof layer (2), a plurality of wires (4) inside the inner insulation layer (3), an elastic sealing ring (5) outside the wires (4), a filling cavity (6) between the elastic sealing ring (5) and the inner wall of the inner insulation layer (3), and a fireproof filler (7) inside the filling cavity (6). The outer sheath (1) is made of high temperature resistant material, the fireproof layer (2) is made of fireproof material, the inner insulation layer (3) is made of insulating material, the elastic sealing ring (5) is made of elastic material, and the fireproof filler (7) is made of fireproof material. The outer sheath (1), the fireproof layer (2), the inner insulation layer (3), the elastic sealing ring (5), and the fireproof filler (7) cooperate with each other to form a multi-layer protective structure to achieve high temperature resistant fireproof function.

2. The sheath structure of a high-temperature fire-resistant cable according to claim 1, characterized in that: The outer sheath (1) is a cylindrical structure with one end open and the other end closed. The inner wall of the open end of the outer sheath (1) is provided with internal threads, and the outer wall of the outer sheath (1) is provided with several heat dissipation holes.

3. The sheath structure of a high-temperature fire-resistant cable according to claim 1, characterized in that: The fireproof layer (2) is annular and closely adheres to the inner wall of the outer sheath (1). The fireproof layer (2) contains a number of fireproof particles (201).

4. The sheath structure of a high-temperature fire-resistant cable according to claim 1, characterized in that: The inner insulation layer (3) is a cylindrical structure with one end open and the other end closed. The inner wall of the open end of the inner insulation layer (3) is provided with internal threads.

5. The sheath structure of a high-temperature fire-resistant cable according to claim 1, characterized in that: The conductor (4) is cylindrical and evenly distributed inside the inner insulation layer (3). The conductor (4) is made of several copper wires twisted together. The elastic sealing ring (5) is sleeved on the outside of the conductor (4) and the elastic sealing ring (5) is tightly fitted to the conductor (4).

6. The sheath structure of a high-temperature fire-resistant cable according to claim 1, characterized in that: The fireproof filler (7) filling the filling cavity (6) is ceramic fiber cotton.

7. The sheath structure of a high-temperature fire-resistant cable according to claim 1, characterized in that: The high-temperature resistant material of the outer sheath (1) is ceramicized fireproof rubber. The ceramicized fireproof rubber will form a ceramicized protective layer at high temperature to enhance the high-temperature resistance of the sheath structure.

8. The sheath structure of a high-temperature fire-resistant cable according to claim 1, characterized in that: The fireproof material of the fireproof layer (2) is a fireproof coating. The fireproof coating is applied to the inner wall of the outer sheath (1) to achieve fire protection for the sheath structure.

9. The sheath structure of a high-temperature fire-resistant cable according to claim 1, characterized in that: The insulating material of the inner insulation layer (3) is high-temperature resistant insulating varnish, which is coated on the outer wall of the inner insulation layer (3) to achieve insulation protection for the conductor (4).

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