A mineral insulated high temperature resistant fireproof cable

Abstract

The utility model relates to cable technical field discloses a kind of mineral matter insulation high-temperature resistant fireproof cable, including wear-resistant rubber sleeve and multiple wires, the inside of wear-resistant rubber sleeve is provided with bending mechanism, the front side of wear-resistant rubber sleeve is provided with connecting mechanism;The bending mechanism includes multiple bellows, the inner wall of wear-resistant rubber sleeve is fixedly connected in multiple bellows outer wall, the adjacent side of multiple bellows is fixedly connected with multiple elastic ropes, the inner wall of multiple bellows is fixedly connected with shielding layer, the outer wall of multiple wires is fixedly connected with anticorrosive layer.In the utility model, through the elastic deformation of bellows wave structure, provide bending buffer, avoid cable excessive bending damage internal structure, elastic rope auxiliary connection and buffer, when bellows deformation, it can stretch or shrink, guarantee wire transmission stability, wire outside has anticorrosive layer, fireproof layer and barrier sleeve layer in turn, protect cable from different aspects.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a mineral-insulated, high-temperature resistant, fire-resistant cable. Background Technology

[0002] Mineral-insulated high-temperature fire-resistant cables, a type of special cable using inorganic minerals as insulation material and a metal sheath as protective layer, possess excellent high-temperature resistance, fire resistance, and explosion-proof properties. They are widely used in high-temperature and high-risk fields such as metallurgy, chemical industry, and power, as well as in scenarios with extremely high fire safety requirements, such as high-rise building fire protection and tunnel engineering. Their core advantage lies in their ability to operate stably and continuously in high-temperature environments, and even in fires, they can still ensure power transmission, providing reliable support for critical equipment and emergency systems. The emergence of this type of cable effectively fills the gap in the ability of traditional cables to meet safety requirements under extreme conditions, making it an indispensable basic material for modern industrial and public facility construction.

[0003] Early mineral-insulated high-temperature fire-resistant cables mainly consisted of a copper conductor, a magnesium oxide insulation layer, and a copper sheath. While this structure could meet basic high-temperature resistance and fire resistance requirements, the magnesium oxide insulation layer was a rigid material, and the thermal expansion coefficients of the copper sheath and magnesium oxide differed significantly. During cable operation, frequent hot and cold cycles caused significant stress between the sheath and the insulation layer, leading to cracking and air gap formation in the magnesium oxide insulation layer. This severely affected the cable's insulation performance and service life. To address this issue, existing technologies have mitigated the stress caused by thermal expansion and contraction to some extent by adding flexible adhesives to the insulation layer and using a corrugated metal sheath structure. However, existing solutions still have limitations: the corrugated metal sheath requires a large bending radius when bent. In confined spaces or installation scenarios requiring sharp bends, this structure can lead to corrugation deformation and failure due to excessive bending. This not only weakens its ability to compensate for thermal expansion and contraction but also causes localized stress concentration in the sheath, accelerating sheath damage and ultimately exposing the cable insulation layer, posing a short-circuit safety hazard. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a mineral-insulated high-temperature fire-resistant cable, which aims to improve the problem in the prior art where excessive bending can cause corrugation deformation and failure in installation scenarios with confined spaces or sharp bends.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a mineral-insulated high-temperature fireproof cable, comprising a wear-resistant rubber sleeve and multiple conductors, wherein a bending mechanism is provided inside the wear-resistant rubber sleeve and a connecting mechanism is provided on the front side of the wear-resistant rubber sleeve; The bending mechanism includes multiple corrugated tubes, the outer walls of which are fixedly connected to the inner wall of the wear-resistant rubber sleeve. Multiple elastic ropes are fixedly connected to adjacent sides of the multiple corrugated tubes. A shielding layer is fixedly connected to the inner wall of the multiple corrugated tubes. An anti-corrosion layer is fixedly connected to the outer wall of the multiple wires. A fireproof layer is fixedly connected to the outer wall of the anti-corrosion layer. A barrier sleeve is fixedly connected to the outer wall of the fireproof layer. A shielding layer is fixedly connected to the outer wall of the multiple barrier sleeves.

[0006] As a further description of the above technical solution: The connecting mechanism includes a connecting disc, the front side of the outer wall of the connecting disc is disposed on the front side of the wear-resistant rubber sleeve, the middle of the rear side of the connecting disc is connected to a limiting sleeve, a plurality of conical sleeves are fixedly connected to the front side of the inner wall of the connecting disc, a fixing screw is threadedly connected to the inner wall of the limiting sleeve, a plurality of L-shaped extrusion blocks are rotatably connected to the rear side of the inner wall of the limiting sleeve, and a sealing ring is fixedly connected to the outer wall of the connecting disc.

[0007] As a further description of the above technical solution: The outer wall of the wear-resistant rubber sleeve is fixedly connected to the front side of the outer sleeve, and the outer wall of the connecting plate is engaged with the inner wall of the outer sleeve.

[0008] As a further description of the above technical solution: The inner wall of the outer sleeve is threadedly connected to a compression cylinder, and the inner wall of the compression cylinder is rotatably connected to a limit sleeve.

[0009] As a further description of the above technical solution: The inner wall of the limiting sleeve engages with the outer wall of the corresponding conical sleeve, and the outer wall size of the limiting sleeve is the same as the inner wall size of the shielding layer.

[0010] As a further description of the above technical solution: A limiting block is fixedly connected to the front side of the extrusion cylinder, and a sealing sleeve is fixedly connected to the front side of the inner wall of the limiting block.

[0011] As a further description of the above technical solution: The outer wall of the conductor engages with the inner wall of the conical sleeve, and the outer wall of the sealing ring engages with the inner wall of the outer sleeve.

[0012] As a further description of the above technical solution: The outer wall of the L-shaped extrusion block engages with the inner wall of the shielding layer, and the outer wall of the extrusion cylinder is corrugated.

[0013] This utility model has the following beneficial effects: 1. In this utility model, the corrugated structure of the corrugated tube provides bending buffer through elastic deformation, avoiding damage to the internal structure of the cable due to excessive bending. The elastic rope assists in connection and buffering, and can stretch or contract when the corrugated tube deforms. The shielding layer is wrapped around the barrier sleeve to block external electromagnetic interference and ensure stable transmission of the conductor. The conductor is surrounded by an anti-corrosion layer, a fireproof layer and a barrier sleeve in sequence, protecting the conductor from different aspects.

[0014] 2. In this utility model, a connecting disc is installed on the front side of the wear-resistant rubber sleeve. The conical sleeve on the front side of its inner wall engages with the wire. The limiting sleeve is inserted into the central cavity area of ​​the shielding layer. Then, the fixing screw is rotated to push multiple L-shaped extrusion blocks to rotate outward, so that they engage with the central cavity area of ​​the shielding layer, thus achieving a stable connection. At the same time, the sealing ring on the outer wall of the connecting disc fills the gaps during connection to prevent external moisture, dust and impurities from entering the cable, ensuring the sealing and reliability of the connection. Attached Figure Description

[0015] Figure 1 This is a perspective view of a mineral-insulated, high-temperature resistant, fire-resistant cable proposed in this utility model. Figure 2 This is a front view of a mineral-insulated, high-temperature resistant, fire-resistant cable proposed in this utility model. Figure 3 This is a cross-sectional view of a mineral-insulated high-temperature fire-resistant cable proposed in this utility model. Figure 4 This is a cross-sectional view of the wear-resistant rubber sleeve of a mineral-insulated high-temperature fire-resistant cable proposed in this utility model. Figure 5 This is a cross-sectional view of a connecting block for a mineral-insulated, high-temperature resistant, fire-resistant cable proposed in this utility model. Figure 6 This is an exploded view of the limiting disc of a mineral-insulated high-temperature fire-resistant cable proposed in this utility model.

[0016] Legend: 1. Wear-resistant rubber sleeve; 2. Bending mechanism; 201. Corrugated pipe; 202. Elastic rope; 203. Shielding layer; 204. Barrier sleeve; 205. Fireproof layer; 206. Anti-corrosion layer; 3. Connecting mechanism; 301. Connecting disc; 302. Conical sleeve; 303. Limiting sleeve; 304. Fixing screw; 305. L-shaped extrusion block; 306. Sealing ring; 4. Wire; 5. Outer sleeve; 6. Extrusion cylinder; 7. Limiting block; 8. Sealing sleeve; 9. Limiting disc. Detailed Implementation

[0017] 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.

[0018] Reference Figure 1 , Figure 3 and Figure 4 An embodiment of this utility model is provided: a mineral-insulated high-temperature fireproof cable, including a wear-resistant rubber sleeve 1 and multiple conductors 4. The wear-resistant rubber sleeve 1 is provided with a bending mechanism 2 inside and a connecting mechanism 3 is provided on the front side of the wear-resistant rubber sleeve 1. The bending mechanism 2 includes multiple bellows 201, the outer walls of which are fixedly connected to the inner wall of the wear-resistant rubber sleeve 1. The bellows 201 can generate elastic deformation through their corrugated structure, providing a certain degree of bending buffer. Multiple elastic ropes 202 are fixedly connected to adjacent sides of each bellows 201. The elastic ropes 202 serve as auxiliary connections and buffers; when the bellows 201 deforms, the elastic ropes 202 can stretch or contract, further enhancing the flexibility and stability of the bending mechanism 2. A screen is fixedly connected to the inner wall of each bellows 201. The outer wall of the shielding layer 203 is fixedly connected to the anti-corrosion layer 206, and the outer wall of the anti-corrosion layer 206 is fixedly connected to the fireproof layer 205. When the fireproof layer 205 is exposed to high temperature, it can effectively delay the heat transfer to the wire 4. The outer wall of the fireproof layer 205 is fixedly connected to the barrier sleeve 204, which can prevent the fireproof layer 205 material from directly rubbing against the wire 4. The outer wall of the multiple barrier sleeves 204 is fixedly connected to the shielding layer 203. The shielding layer 203 is wrapped around the barrier sleeve 204 and can effectively block external electromagnetic interference. Specifically, in the bending mechanism 2, multiple corrugated tubes 201 are fixed to the inner wall of the wear-resistant rubber sleeve 1. When the cable needs to be bent, the corrugated tubes 201 can generate elastic deformation through their own corrugated structure, providing a certain bending buffer and preventing the cable from being damaged by excessive bending. The elastic ropes 202 between adjacent corrugated tubes 201 play an auxiliary connection and buffering role. When the corrugated tubes 201 deform, the elastic ropes 202 can stretch or contract, further enhancing the flexibility and stability of the bending mechanism 2. The shielding layer 203 is wrapped around the barrier sleeve 204, which can provide... To effectively block external electromagnetic interference and ensure the stability of signal or power transmission in the conductor 4, the conductor 4 is sequentially provided with an anti-corrosion layer 206, a fireproof layer 205, and a barrier sleeve 204, which protect the conductor 4 from different aspects. The anti-corrosion layer 206 can resist the erosion of the conductor 4 by external corrosive substances; the fireproof layer 205 can effectively delay the heat transfer to the conductor 4 when encountering high temperatures, ensuring that the cable can continue to work normally for a certain period of time; the barrier sleeve 204 can prevent the fireproof layer 205 material from directly rubbing against the conductor 4, and at the same time play a certain structural support role.

[0019] Reference Figure 1 , Figure 5 and Figure 6 The connecting mechanism 3 includes a connecting disc 301. The front side of the outer wall of the connecting disc 301 is located on the front side of the wear-resistant rubber sleeve 1. The middle of the rear side of the connecting disc 301 is connected to a limiting sleeve 303. The connecting disc 301 is installed on the front side of the wear-resistant rubber sleeve 1. The tapered sleeve 302 on the front side of its inner wall can be engaged with the wire 4. The limiting sleeve 303 is inserted into the cavity area in the middle of the shielding layer 203. Multiple tapered sleeves 302 are fixedly connected to the front side of the inner wall of the connecting disc 301. The inner wall of the limiting sleeve 303 is threaded. A fixing screw 304 is connected to the inner wall of the limiting sleeve 303, and multiple L-shaped extrusion blocks 305 are rotatably connected to it. Rotating the fixing screw 304 can push the multiple L-shaped extrusion blocks 305 to rotate outward, thereby making the L-shaped extrusion blocks 305 engage with the cavity area in the middle of the shielding layer 203 to achieve a stable connection. A sealing ring 306 is fixedly connected to the outer wall of the connecting plate 301. The sealing ring 306 on the outer wall of the connecting plate 301 can fill the gaps during the connection process to prevent external moisture. Specifically, the connecting disc 301 is installed on the front side of the wear-resistant rubber sleeve 1. The conical sleeve 302 on the front side of its inner wall can be engaged with the wire 4. The limiting sleeve 303 is inserted into the cavity area in the middle of the shielding layer 203. Then, the fixing screw 304 is rotated so that it can push multiple L-shaped extrusion blocks 305 to rotate outward, thereby making the L-shaped extrusion blocks 305 engage with the cavity area in the middle of the shielding layer 203 to achieve a stable connection. The sealing ring 306 on the outer wall of the connecting disc 301 can fill the gaps during the connection process to prevent external moisture, dust and impurities from entering the cable, thereby ensuring the sealing and reliability of the connection.

[0020] Reference Figure 1 , Figure 2 and Figure 5 An outer sleeve 5 is fixedly connected to the front side of the outer wall of the wear-resistant rubber sleeve 1. The outer sleeve 5 further strengthens the protection of the cable front end. The outer wall of the connecting plate 301 engages with the inner wall of the outer sleeve 5. A compression cylinder 6 is threadedly connected to the front side of the inner wall of the outer sleeve 5. The compression cylinder 6 enables the positioning and quick installation of the connecting plate 301 and the cable body. A limiting sleeve 9 is rotatably connected to the front end of the inner wall of the compression cylinder 6, which can flexibly adjust the position of the limiting sleeve 9. The inner walls of the limiting sleeve 9 engage with the outer walls of the corresponding conical sleeves 302, providing dual positioning and fixing. The outer wall dimensions of the limiting sleeves 303 and the inner wall dimensions of the shielding layer 203 are consistent. The dimensions are consistent to ensure that the limiting sleeve 303 can be accurately inserted into the shielding layer 203; the front side of the extrusion cylinder 6 is fixedly connected to the limiting block 7 to limit the rotation angle and movement range of the extrusion cylinder 6; the inner wall of the limiting block 7 is fixedly connected to the front side of the sealing sleeve 8 to form a sealing barrier at the cable connection point; the outer wall of the conductor 4 engages with the inner wall of the conical sleeve 302, and the outer wall of the sealing ring 306 engages with the inner wall of the outer sleeve 5, which enhances the sealing performance of the cable connection point; the outer wall of the L-shaped extrusion block 305 engages with the inner wall of the shielding layer 203; the outer wall of the extrusion cylinder 6 adopts a corrugated design to increase the friction of its outer wall; Specifically, the outer sleeve 5 further strengthens the protection of the cable front end and provides an installation foundation and connection carrier for subsequent connecting components. The compression cylinder 6 enables the positioning and rapid installation of the connecting disc 301 and the cable body. The compression cylinder 6 is threaded to the front of the inner wall of the outer sleeve 5, forming an adjustable fastening device. The front end of the inner wall of the compression cylinder 6 is rotatably connected to the limiting sleeve 9, which can flexibly adjust the position of the limiting sleeve 9. The inner wall of the limiting sleeve 9 engages with the outer wall of the corresponding conical sleeve 302, providing dual positioning and fixing. The outer wall size of the limiting sleeve 303 is the same as the inner wall size of the shielding layer 203, ensuring that the limiting sleeve 303 can be accurately inserted into the shielding layer 203. Inside the 3, a limiting block 7 is fixedly connected to the front side of the extrusion cylinder 6 to limit the rotation angle and movement range of the extrusion cylinder 6, preventing damage to the connecting parts or failure of the connection due to excessive rotation or movement during operation. A sealing sleeve 8 is fixedly connected to the front side of the inner wall of the limiting block 7, forming a sealing barrier at the cable connection point. The outer wall of the conductor 4 engages with the inner wall of the conical sleeve 302, enhancing the sealing performance of the cable connection point. The outer wall of the sealing ring 306 engages with the inner wall of the outer sleeve 5, playing a key fastening role in the cable connection process. The outer wall of the extrusion cylinder 6 adopts a corrugated design, which increases the friction of its outer wall, making it easier and more convenient for the operator to rotate the extrusion cylinder 6, and preventing slippage.

[0021] Working principle: First, in the bending mechanism 2, when the cable needs to be bent, the corrugated tube 201 can generate elastic deformation due to its corrugated structure, thereby providing a certain degree of bending buffer and preventing damage to the internal structure of the cable due to excessive bending. Furthermore, the elastic rope 202 between adjacent corrugated tubes 201 plays an auxiliary connection and buffering role. When the corrugated tube 201 deforms, the elastic rope 202 can stretch or contract, further enhancing the flexibility and stability of the bending mechanism 2. The shielding layer 203, wrapped around the barrier sleeve 204, can effectively... To block external electromagnetic interference and ensure the stability of signal or power transmission in conductor 4, conductor 4 is sequentially provided with an anti-corrosion layer 206, a fireproof layer 205, and a barrier sleeve 204. These layers protect conductor 4 from different perspectives. The anti-corrosion layer 206 can resist the erosion of conductor 4 by external corrosive substances; the fireproof layer 205 can effectively delay the heat transfer to conductor 4 when exposed to high temperatures, ensuring the cable can continue to operate normally for a certain period of time; the barrier sleeve 204 can prevent the fireproof layer 205 material from directly rubbing against conductor 4, while also providing a certain structural support. Furthermore, the connecting disc 301 is installed on the front side of the wear-resistant rubber sleeve 1 through the connecting mechanism 3. The conical sleeve 302 on the front side of its inner wall can be engaged with the wire 4. The limiting sleeve 303 is inserted into the cavity area in the middle of the shielding layer 203. Then, the fixing screw 304 is rotated to push multiple L-shaped extrusion blocks 305 to rotate outward, thereby enabling the L-shaped extrusion blocks 305 to engage with the cavity area in the middle of the shielding layer 203 to achieve a stable connection. During the connection process, the sealing ring 306 on the outer wall of the connecting disc 301 can fill the gaps to prevent external moisture, dust and impurities from entering the cable, thereby ensuring the sealing and reliability of the connection.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present 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 the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mineral-insulated high-temperature fire-resistant cable, comprising a wear-resistant rubber sheath (1) and a plurality of conductors (4), characterized in that: The wear-resistant rubber sleeve (1) is provided with a bending mechanism (2) inside, and a connecting mechanism (3) is provided on the front side of the wear-resistant rubber sleeve (1). The bending mechanism (2) includes multiple corrugated tubes (201), the outer walls of the multiple corrugated tubes (201) are fixedly connected to the inner wall of the wear-resistant rubber sleeve (1), multiple elastic ropes (202) are fixedly connected to each adjacent side of the multiple corrugated tubes (201), a shielding layer (203) is fixedly connected to the inner wall of the multiple corrugated tubes (201), an anti-corrosion layer (206) is fixedly connected to the outer wall of the multiple wires (4), a fireproof layer (205) is fixedly connected to the outer wall of the anti-corrosion layer (206), a barrier sleeve (204) is fixedly connected to the outer wall of the fireproof layer (205), and a shielding layer (203) is fixedly connected to the outer wall of the multiple barrier sleeves (204).

2. The mineral-insulated high-temperature fire-resistant cable according to claim 1, characterized in that: The connecting mechanism (3) includes a connecting disc (301), the front side of the outer wall of the connecting disc (301) is disposed on the front side of the wear-resistant rubber sleeve (1), the middle rear side of the connecting disc (301) is connected to a limiting sleeve (303), a plurality of conical sleeves (302) are fixedly connected to the front inner wall of the connecting disc (301), a fixing screw (304) is threadedly connected to the inner wall of the limiting sleeve (303), a plurality of L-shaped extrusion blocks (305) are rotatably connected to the rear inner wall of the limiting sleeve (303), and a sealing ring (306) is fixedly connected to the outer wall of the connecting disc (301).

3. The mineral-insulated high-temperature fire-resistant cable according to claim 2, characterized in that: The outer wall of the wear-resistant rubber sleeve (1) is fixedly connected to the front side of the outer sleeve (5), and the outer wall of the connecting plate (301) is engaged with the inner wall of the outer sleeve (5).

4. The mineral-insulated high-temperature fire-resistant cable according to claim 3, characterized in that: The inner wall front side of the outer sleeve (5) is threaded with an extrusion cylinder (6), and the front end of the inner wall of the extrusion cylinder (6) is rotatably connected to a limiting sleeve (9).

5. The mineral-insulated high-temperature fire-resistant cable according to claim 4, characterized in that: The inner wall of the limiting sleeve (9) engages with the outer wall of the corresponding conical sleeve (302), and the outer wall size of the limiting sleeve (303) is the same as the inner wall size of the shielding layer (203).

6. The mineral-insulated high-temperature fire-resistant cable according to claim 4, characterized in that: A limiting block (7) is fixedly connected to the front side of the extrusion cylinder (6), and a sealing sleeve (8) is fixedly connected to the front side of the inner wall of the limiting block (7).

7. The mineral-insulated high-temperature fire-resistant cable according to claim 3, characterized in that: The outer wall of the conductor (4) engages with the inner wall of the conical sleeve (302), and the outer wall of the sealing ring (306) engages with the inner wall of the outer sleeve (5).

8. The mineral-insulated high-temperature fire-resistant cable according to claim 4, characterized in that: The outer wall of the L-shaped extrusion block (305) engages with the inner wall of the shielding layer (203), and the outer wall of the extrusion cylinder (6) is corrugated.

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