A halogen-free flame-retardant and fire-resistant cable

Abstract

The present invention discloses a halogen-free flame-retardant fire-resistant cable, which comprises an outer sheath, a flame-retardant layer, an armor layer, a filling layer and a cable core arranged in sequence from outside to inside. The outer sheath is made of cross-linked polyethylene material; the flame-retardant layer includes a first ring, a second ring and a third ring arranged at intervals in sequence. Both the first ring and the third ring are fixedly sleeved on the armor layer, and the second ring is slidably sleeved on the armor layer. A plurality of mounting blocks are arranged on one side of the first ring and the second ring facing each other; by providing the flame-retardant layer, when a fire breaks out and burns outside the cable, the spring can drive the second ring to approach the first ring, so that the connection part of the first folding rod and the second folding rod moves along the outside of the cable core. During this process, the outer sheath of the cable can be cut off by the spike part and the telescopic cutting ring, thereby physically blocking the spread of the fire outside the cable and providing a safe and reliable halogen-free flame-retardant fire-resistant cable.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly to a halogen-free flame-retardant fire-resistant cable. Background Art

[0002] A fire-resistant power cable is a cable that can still maintain normal operation of the circuit for a certain period of time even under the condition of flame combustion, and also has a certain power supply capacity in case of fire. Most fire-resistant cables are used as the power supply circuit of the emergency power supply, and it is required to ensure the lighting of the fire-fighting passage, the safety of the circuits of fire-fighting facilities and other emergency equipment during a fire.

[0003] The common polymer insulating materials used in power cables are flammable materials. During the process of transmitting electric energy, the cable combustion is often caused by internal or external factors, further causing losses to life and property. In order to reduce the losses caused by cable combustion, the general method is to add halides and metal oxides to the flame-retardant cable, and use the smoke and hydrogen halide gas generated during the initial combustion to isolate the cable from the air, thereby playing a role in flame retardancy.

[0004] However, since these added halides and metal oxides will release a large amount of smoke and toxic and corrosive gases during combustion, these gases are dangerous factors in a fire, which hinder the safe evacuation of people and the fire-fighting work during a fire, and cause serious losses to life and property. Therefore, there is an increasing need to use safe and reliable halogen-free flame-retardant fire-resistant cables. Summary of the Invention

[0005] In order to solve the above technical problems in the prior art, the purpose of the present invention is to provide a safe and reliable halogen-free flame-retardant fire-resistant cable.

[0006] To achieve the above object, a halogen-free flame-retardant fire-resistant cable is provided, which includes an outer sheath, a flame-retardant layer, an armor layer, a filling layer, and a cable core arranged from outside to inside in sequence. The outer sheath is made of cross-linked polyethylene material; the flame-retardant layer includes a first ring, a second ring, and a third ring arranged at intervals in sequence. The first ring and the third ring are both fixedly sleeved on the armor layer, the second ring is slidably sleeved on the armor layer, and a plurality of mounting blocks are arranged on one side of the first ring and the second ring opposite to each other. A plurality of first folding rods and second folding rods are arranged between the first ring and the second ring. One ends of the plurality of first folding rods are rotatably connected to the mounting blocks on the first ring, one ends of the plurality of second folding rods are rotatably connected to the mounting blocks on the second ring, and the other ends of the plurality of first folding rods are rotatably connected to the other ends of the plurality of second folding rods. A telescopic cutting ring is arranged at the connection part, a spike part is arranged at the top of the other end of the first folding rod, a plurality of guide rods are arranged on the side of the third ring opposite to the second ring, one ends of the plurality of guide rods are slidably inserted through the second ring, springs are arranged on the outer sides of the plurality of guide rods, one end of the spring is connected to the second ring, the other end of the spring is connected to the third ring, a plurality of pull ropes are arranged on the side of the second ring close to the third ring, fixing blocks are arranged at one ends of the plurality of pull ropes, and the fixing blocks are fixedly connected to the armor layer. The fixing blocks are made of thermosensitive materials, and the springs are in a compressed state.

[0007] The working principle and beneficial effects of the present invention: In the flame-retardant layer, except that the fixing blocks are made of thermosensitive materials, the rest of the components are made of high-temperature-resistant metal materials; when producing this cable, first use a filling material to wrap the cable core to form a filling layer, trim the surface of the filling layer, wrap the armor layer on the surface of the filling layer, install the flame-retardant layer on the armor layer, and finally set the outer sheath on the surface of the flame-retardant layer; the melting point of the fixing blocks is lower than the melting point of the outer sheath. When this cable encounters an external fire during use, the outer sheath will become soft when heated, and the outer sheath will burn when the temperature gradually rises. The flame-retardant layer works, and the fixing blocks melt when heated. When the fixing blocks melt, the connection between the pull ropes and the armor layer is disconnected, and the springs gradually change from the contracted state to the natural state. The springs are stretched along the guide rods. During this process, the springs provide a thrust force to the second ring, and the springs push the second ring towards the first ring. One end of the first folding rod rotates along the mounting block of the first ring, one end of the second folding rod rotates along the mounting block of the second ring, the other end of the first folding rod rotates along the other end of the second folding rod, the included angle between the first folding rod and the second folding rod gradually becomes smaller, the connection part of the first folding rod and the second folding rod moves along the outside of the cable core, and the telescopic cutting ring is elongated as the second telescopic rod moves, and the diameter of the telescopic cutting ring gradually becomes larger. During this process, the spike part can pierce the outer sheath, and the telescopic cutting ring can cut off the outer sheath;

[0008] By setting a flame-retardant layer, when a fire breaks out and burns outside the cable, the spring can drive the second ring to approach the first ring, causing the connection between the first folding rod and the second folding rod to move along the outside of the cable core. During this process, the spiked part and the telescopic cutting ring can cut off the outer sheath of the cable, thereby physically blocking the spread of fire on the outside of the cable and providing a safe and reliable halogen-free flame-retardant and fire-resistant cable.

[0009] According to the described halogen-free flame-retardant and fire-resistant cable, the cable core includes an anti-torsion rope, a support skeleton, and copper conductors. The support skeleton is fixedly connected to the anti-torsion rope. There are multiple copper conductors, and the multiple copper conductors are evenly distributed at equal intervals in a ring shape outside the anti-torsion rope. The multiple copper conductors all pass through the support skeleton, and an insulating layer is arranged outside the multiple copper conductors.

[0010] By setting the anti-torsion rope and the support skeleton, the multiple copper conductors can be fixed.

[0011] According to the described halogen-free flame-retardant and fire-resistant cable, the support skeleton includes a support ring, support rods, and fixing bands. The support ring is fixedly passed through the anti-torsion rope. A plurality of support rods are arranged at intervals outside the support ring. The copper conductors are located between adjacent support rings. Fixing bands are arranged between adjacent two support rods. The fixing bands are in a U shape. The copper conductors are located in the depressions of the fixing bands. The two ends of the fixing bands are respectively fixedly connected to the ends of the adjacent two support rods. The copper conductors are clamped between the adjacent two support rods and the corresponding fixing bands.

[0012] When installing the support skeleton, the anti-torsion rope passes through the support ring, and the anti-torsion rope and the support ring can be fixed by fixing glue. Then, the copper conductors are respectively clamped between adjacent two support rods. Finally, the copper conductors are fixed between the support rods and the fixing bands by using the fixing bands. When the outside of the cable burns, the insulating layer outside the copper conductors melts when heated, and each copper conductor in the cable core can be prevented from sticking together under the support of the support skeleton, thereby avoiding short circuits caused by the contact of each copper conductor.

[0013] According to the described halogen-free flame-retardant and fire-resistant cable, the first folding rod is provided with a groove that can accommodate part of the second folding rod.

[0014] By providing a groove on the first folding rod, when the first folding rod and the second folding rod are in a folded state, the groove can accommodate part of the second folding rod, so that the angle between the first folding rod and the second folding rod can become smaller.

[0015] According to the described halogen-free flame-retardant and fire-resistant cable, a through hole is provided at one end of the second folding rod that is rotatably connected to the first folding rod, and the telescopic cutting ring passes through the through hole.

[0016] By providing a through hole and the telescopic cutting ring passing through the through hole, the displacement of the telescopic cutting ring can be avoided.

[0017] According to the described halogen-free flame-retardant fire-resistant cable, the armor layer is formed by winding steel strips.

[0018] During the production of the cable, the armor layer is wound by steel strips; by providing the armor layer, when the outer sheath of the cable is damaged, the armor layer can play a role in protecting the internal cable core.

[0019] According to the described halogen-free flame-retardant fire-resistant cable, the filling layer is filled with a ceramized fire-resistant filling rope.

[0020] During the production of the cable, the outer part of the cable core is filled with a ceramized fire-resistant filling rope, so that the outer part of the cable core has better roundness, thereby facilitating the winding of the armor layer.

[0021] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. Brief Description of the Drawings

[0022] The present invention will be further described below in conjunction with the drawings and embodiments;

[0023] Figure 1 It is a perspective view of a halogen-free flame-retardant fire-resistant cable.

[0024] Figure 2 It is a front view of a halogen-free flame-retardant fire-resistant cable.

[0025] Figure 3 It is a perspective view of the working state of the flame-retardant layer of a halogen-free flame-retardant fire-resistant cable.

[0026] Figure 4 It is a partial perspective view of the flame-retardant layer of a halogen-free flame-retardant fire-resistant cable.

[0027] Figure 5 It is a perspective view of the first folding rod of a halogen-free flame-retardant fire-resistant cable.

[0028] Figure 6 It is a perspective view of the second folding rod of a halogen-free flame-retardant fire-resistant cable.

[0029] Wherein: 1. Outer sheath; 2. Flame-retardant layer; 21. First ring; 211. Mounting block; 22. Second ring; 23. Third ring; 24. First folding rod; 241. Spiked part; 242. Groove; 25. Second folding rod; 251. Through hole; 26. Telescopic cutting ring; 27. Guide rod; 28. Spring; 29. Pulling rope; 291. Fixed block; 3. Armor layer; 4. Filling layer; 5. Cable core; 51. Anti-torsion rope; 52. Support skeleton; 521. Support ring; 522. Support rod; 523. Fixed band; 53. Copper conductor; 531. Insulating layer. Detailed Embodiments

[0030] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0031] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention.

[0032] In the description of the present invention, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, and "above", "below", "within", etc. are understood as including the number itself. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

[0034] Refer to Figures 1-6, a halogen-free flame-retardant fire-resistant cable of the present invention, which comprises an outer sheath 1, a flame-retardant layer 2, an armor layer 3, a filling layer 4 and a cable core 5 arranged in sequence from outside to inside. The outer sheath 1 is made of cross-linked polyethylene material; the flame-retardant layer 2 includes a first ring 21, a second ring 22 and a third ring 23 arranged at intervals in sequence. Both the first ring 21 and the third ring 23 are fixedly sleeved on the armor layer 3, the second ring 22 is slidably sleeved on the armor layer 3, and a plurality of mounting blocks 211 are arranged on the opposite sides of the first ring 21 and the second ring 22. A plurality of first folding rods 24 and second folding rods 25 are arranged between the first ring 21 and the second ring 22. One ends of the plurality of first folding rods 24 are rotatably connected to the mounting blocks 211 on the first ring 21, and one ends of the plurality of second folding rods 25 are rotatably connected to the mounting blocks 211 on the second ring 22. The other ends of the plurality of first folding rods 24 are rotatably connected to the other ends of the plurality of second folding rods 25, and a telescopic cutting ring 26 is arranged at the connection. A spike portion 241 is arranged at the top of the other end of the first folding rod 24. A plurality of guide rods 27 are arranged on the opposite side of the third ring 23 to the second ring 22. One ends of the plurality of guide rods 27 are slidably inserted through the second ring 22, and springs 28 are arranged on the outer sides of the plurality of guide rods 27. One end of the spring 28 is connected to the second ring 22, and the other end of the spring 28 is connected to the third ring 23. A plurality of pull ropes 29 are arranged on one side of the second ring 22 to the third ring 23. Fixing blocks 291 are arranged at one ends of the plurality of pull ropes 29, and the fixing blocks 291 are fixedly connected to the armor layer 3. The fixing blocks 291 are made of thermosensitive materials, and the springs 28 are in a compressed state.

[0035] Specifically, in the flame retardant layer 2, except that the fixing block 291 is made of a heat-sensitive material, the rest of the components are high-temperature resistant metal materials; when producing this cable, first use a filling material to wrap the cable core 5 to form a filling layer 4, trim the surface of the filling layer 4, wrap an armor layer 3 on the surface of the filling layer 4, install the flame retardant layer 2 on the armor layer 3, and finally set an outer sheath layer 1 on the surface of the flame retardant layer 2; the melting point of the fixing block 291 is lower than that of the outer sheath layer 1. When this cable encounters an external fire during use, the outer sheath layer 1 will become soft when heated, and when the temperature gradually rises, the outer sheath layer 1 will burn, and the flame retardant layer 2 will work. The fixing block 291 will melt when heated. After the fixing block 291 melts, the connection between the pull rope 29 and the armor layer 3 will be disconnected, and the spring 28 will gradually change from a contracted state to a natural state. The spring 28 will stretch along the guide rod 27. During this process, the spring 28 provides a thrust to the second ring 22, and the spring 28 will push the second ring 22 towards the first ring 21. One end of the first folding rod 24 rotates along the mounting block 211 of the first ring 21, and one end of the second folding rod 25 rotates along the mounting block 211 of the second ring 22. The other end of the first folding rod 24 rotates along the other end of the second folding rod 25. The included angle between the first folding rod 24 and the second folding rod 25 gradually becomes smaller, and the connection between the first folding rod 24 and the second folding rod 25 moves along the outside of the cable core 5. The telescopic cutting ring 26 will elongate with the movement of the second telescopic rod, and the diameter of the telescopic cutting ring 26 gradually becomes larger. During this process, the spike part 241 can pierce the outer sheath layer 1, and the telescopic cutting ring 26 can cut off the outer sheath layer 1.

[0036] Optionally, the cable core 5 includes a torsion-resistant rope 51, a support skeleton 52, and copper conductors 53. The support skeleton 52 is fixedly connected to the torsion-resistant rope 51. There are multiple copper conductors 53, and the multiple copper conductors 53 are annularly and equidistantly distributed on the outside of the torsion-resistant rope 51. The multiple copper conductors 53 are all arranged through the support skeleton 52, and an insulating layer 531 is arranged on the outside of the multiple copper conductors 53.

[0037] Optionally, the support skeleton 52 includes a support ring 521, support rods 522, and fixing bands 523. The support ring 521 is fixedly arranged through the torsion-resistant rope 51. A plurality of support rods 522 are arranged at intervals on the outside of the support ring 521. The copper conductors 53 are located between adjacent support rings 521. Fixing bands 523 are arranged between adjacent support rods 522. The fixing bands 523 are U-shaped. The copper conductors 53 are located in the depressions of the fixing bands 523. The two ends of the fixing bands 523 are respectively fixedly connected to the ends of adjacent support rods 522. The copper conductors 53 are clamped between adjacent support rods 522 and the corresponding fixing bands 523.

[0038] Optionally, the first folding rod 24 is provided with a groove 242 that can accommodate part of the second folding rod 25.

[0039] Optionally, a through hole 251 is provided at one end of the second folding rod 25 that is rotatably connected to the first folding rod 24, and the telescopic cutting ring 26 is inserted through the through hole 251.

[0040] Optionally, the armor layer 3 is formed by winding steel strips.

[0041] Optionally, the filling layer 4 is filled with a ceramifiable fireproof filling rope.

[0042] Specifically, when producing this cable, first install the support skeleton 52 on the anti-torsion rope 51. The anti-torsion rope 51 passes through the support ring 521, and the anti-torsion rope 51 and the support ring 521 can be fixed by fixing glue. Then, the copper conductors 53 are respectively clamped between two adjacent support rods 522. Finally, use the fixing band 523 to fix the copper conductors 53 between the support rods 522 and the fixing band 523. Fill the outside of the cable core 5 with a ceramifiable fireproof filling rope to make the outside of the cable core 5 have better roundness. Then, cover the armor layer 3 on the surface of the filling layer 4, install the flame retardant layer 2 on the armor layer 3, and finally set the outer sheath 1 on the surface of the flame retardant layer 2; the melting point of the fixing block 291 is lower than the melting point of the outer sheath 1. When this cable encounters an external fire during use, the outer sheath 1 will become soft when heated. When the temperature gradually rises, the outer sheath 1 will burn, and the flame retardant layer 2 will work. The fixing block 291 will melt when heated. When the fixing block 291 melts, the connection between the pull rope 29 and the armor layer 3 will be disconnected. The spring 28 will gradually change from a contracted state to a natural state, and the spring 28 will stretch along the guide rod 27. During this process, the spring 28 provides a thrust to the second ring 22, and the spring 28 pushes the second ring 22 towards the first ring 21. One end of the first folding rod 24 rotates along the mounting block 211 of the first ring 21, and one end of the second folding rod 25 rotates along the mounting block 211 of the second ring 22. The other end of the first folding rod 24 rotates along the other end of the second folding rod 25. The included angle between the first folding rod 24 and the second folding rod 25 gradually becomes smaller, and the connection between the first folding rod 24 and the second folding rod 25 moves along the outside of the cable core 5. The telescopic cutting ring 26 is elongated as the second telescopic rod moves, and the diameter of the telescopic cutting ring 26 gradually becomes larger. During this process, the spike portion 241 can pierce the outer sheath 1, and the telescopic cutting ring 26 can cut off the outer sheath 1.

[0043] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the technical field, various changes can be made without departing from the purpose of the present invention.

Claims

1. A halogen-free flame-retardant and fire-resistant cable, characterized in that, It includes an outer sheath, a flame retardant layer, an armor layer, a filling layer and a cable core arranged from outside to inside in sequence. The outer sheath is made of cross-linked polyethylene material; The flame retardant layer includes a first ring, a second ring and a third ring arranged at intervals in sequence. The first ring and the third ring are both fixedly sleeved on the armor layer. The second ring is slidably sleeved on the armor layer. A plurality of mounting blocks are arranged on the opposite sides of the first ring and the second ring. A plurality of first folding rods and second folding rods are arranged between the first ring and the second ring. One ends of the plurality of first folding rods are rotatably connected to the mounting blocks on the first ring. One ends of the plurality of second folding rods are rotatably connected to the mounting blocks on the second ring. The other ends of the plurality of first folding rods are rotatably connected to the other ends of the plurality of second folding rods. A telescopic cutting ring is arranged at the connection part. A spike part is arranged at the top of the other end of the first folding rod. A plurality of guide rods are arranged on the side of the third ring opposite to the second ring. One ends of the plurality of guide rods are slidably inserted through the second ring. Springs are arranged on the outer sides of the plurality of guide rods. One end of the spring is connected to the second ring, and the other end of the spring is connected to the third ring. A plurality of pull ropes are arranged on the side of the second ring close to the third ring. Fixing blocks are arranged at one ends of the plurality of pull ropes. The fixing blocks are fixedly connected to the armor layer. The fixing blocks are made of thermosensitive materials. The springs are in a compressed state.

2. The halogen-free flame-retardant fire-resistant cable according to claim 1, wherein The cable core includes an anti-torsion rope, a support skeleton and copper conductors. The support skeleton is fixedly connected to the anti-torsion rope. There are a plurality of copper conductors. The plurality of copper conductors are annularly and equidistantly distributed on the outside of the anti-torsion rope. The plurality of copper conductors all pass through the support skeleton. An insulating layer is arranged on the outside of the plurality of copper conductors.

3. The halogen-free flame-retardant fire-resistant cable according to claim 2, characterized in that, The support skeleton includes a support ring, support rods and fixing bands. The support ring is fixedly inserted through the anti-torsion rope. A plurality of support rods are arranged at intervals on the outside of the support ring. The copper conductors are located between adjacent support rings. Fixing bands are arranged between adjacent two support rods. The fixing bands are U-shaped. The copper conductors are located in the depressions of the fixing bands. Two ends of the fixing bands are respectively fixedly connected to the ends of adjacent two support rods. The copper conductors are clamped between adjacent two support rods and the corresponding fixing bands.

4. A halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that, The first folding rod is provided with a groove for accommodating part of the second folding rod.

5. A halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that, A through hole is arranged at one end of the second folding rod rotatably connected to the first folding rod. The telescopic cutting ring is inserted through the through hole.

6. The halogen-free flame-retardant and fire-resistant cable according to claim 1, wherein The armor layer is formed by winding steel strips.

7. The non-halogen flame-retardant and fire-resistant cable according to claim 1, characterized in that The filling layer is filled with a ceramized refractory filling rope.

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