Halogen-free flame-retardant fireproof cable

Abstract

The invention discloses a halogen-free flame-retardant fire-resistant cable which comprises an outer protective layer, a flame-retardant layer, an armor layer, a filling layer and a cable core which are sequentially arranged from outside to inside, and the outer protective layer is made of a crosslinked polyethylene material; the flame-retardant layer comprises a first ring, a second ring and a third ring which are sequentially arranged at intervals, the first ring and the third ring are fixedly arranged on the armor layer in a sleeving mode, the second ring is slidably arranged on the armor layer in a sleeving mode, and the third ring is arranged on the armor layer in a sleeving mode. A plurality of mounting blocks are arranged on the opposite sides of the first ring and the second ring; through the arrangement of the flame-retardant layer, when the outside of the cable is on fire and burns, the spring can drive the second ring to approach the first ring, so that the joint of the first folding rod and the second folding rod moves along the outside of the cable core, the outer sheath of the cable can be cut off by using the spine part and the telescopic cutting ring in the process, and then fire spreading on the outer side of the cable can be physically blocked; the halogen-free flame-retardant fire-resistant cable is safe and reliable.

Description

Technical Field

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

[0002] Fire-resistant power cable is a kind of cable that can keep the line running normally for a certain period of time even in the case of flames. It also has the power supply capacity for a certain period of time in the event of fire. Fire-resistant cables are mostly used as emergency power supply circuits, which are required to ensure the safety of fire passage lighting, fire-fighting facilities and other emergency equipment circuits in the event of fire.

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

[0004] However, since these added halides and metal oxides will release a large amount of smoke and toxic, corrosive gases when burned, these gases are dangerous factors in fires, hindering people's safe evacuation and fire fighting, causing serious loss of life and property. Therefore, there is an increasing need to use safe and reliable halogen-free flame-retardant and fire-resistant cables. Summary of the invention

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

[0006] To achieve the above-mentioned purpose, a halogen-free flame-retardant fire-resistant cable is provided, which comprises an outer sheath, a flame-retardant layer, an armor layer, a filling layer and a cable core arranged in sequence from the outside to the inside, wherein the outer sheath is made of a cross-linked polyethylene material; the flame-retardant layer comprises a first ring, a second ring and a third ring arranged in sequence, wherein 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 opposite sides of the first ring and the second ring, a plurality of first folding rods and a second folding rod are arranged between the first ring and the second ring, one end of the plurality of first folding rods are rotatably connected to the mounting block on the first ring, and one end of the plurality of second folding rods are rotatably connected to the mounting block on the first ring, and one end of the plurality of second folding rods are rotatably connected to the mounting block on the first ring. The mounting blocks on the two rings are rotatably connected, and the other ends of the multiple first folding rods are rotatably connected to the other ends of the multiple second folding rods, and a telescopic cutting ring is provided at the connection point. A spike portion is provided on the top of the other end of the first folding rod. The third ring is provided with multiple guide rods on the opposite side of the second ring, and one end of the multiple guide rods are slid through the second ring. Springs are provided on the outside of the multiple 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. The second ring is provided with multiple pull ropes on one side of the third ring, and one end of the multiple pull ropes is provided with a fixed block, which is fixedly connected to the armor layer, the fixed block is a heat-sensitive material, and the spring is in a compressed state.

[0007] The working principle and beneficial effects of the present invention are as follows: in the flame retardant layer, except for the fixing block which is made of heat-sensitive material, the other parts are all made of high-temperature resistant metal materials; when producing the cable, first use the filling material to cover the cable core to form a filling layer, trim the surface of the filling layer, cover the armor layer on the surface of the filling layer, install the flame retardant layer on the armor layer, and finally arrange the outer sheath on the surface of the flame retardant layer; the melting point of the fixing block is lower than the melting point of the outer sheath, when the cable encounters an external fire during use, the outer sheath will become soft when exposed to heat, and when the temperature gradually rises, the outer sheath will burn, the flame retardant layer will work, the fixing block will melt when exposed to heat, and when the fixing block melts, the connection between the draw rope and the armor layer will be disconnected, and the elastic The spring gradually changes from a contracted state to a natural state, and the spring is stretched along the guide rod. During this process, the spring provides thrust to the second ring, and the spring pushes the second ring toward the first ring. One end of the first folding rod rotates along the mounting block of the first ring, and 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 angle between the first folding rod and the second folding rod gradually decreases, and the connection between the first folding rod and the second folding rod moves along the outside of the cable core. The telescopic cutting ring is elongated with the movement of the second telescopic rod, and the diameter of the telescopic cutting ring gradually increases. During this process, the spike portion can pierce the outer sheath, and the telescopic cutting ring can cut the outer sheath.

[0008] By providing a flame retardant layer, when a fire occurs on the outside of the cable, the spring can drive the second ring to approach the first ring, so that the connection between the first folding rod and the second folding rod moves along the outside of the cable core. In this process, the outer sheath of the cable can be cut off using the spike portion and the telescopic cutting ring, thereby physically blocking the spread of fire on the outside of the cable, providing a safe and reliable halogen-free flame retardant fire-resistant cable.

[0009] According to the halogen-free flame-retardant fire-resistant cable, the cable core includes an anti-torsion rope, a supporting frame and a copper conductor. The supporting frame is fixedly connected to the anti-torsion rope. A plurality of copper conductors are provided. The plurality of copper conductors are distributed in a circular shape and are equidistantly distributed on the outside of the anti-torsion rope. The plurality of copper conductors are all passed through the supporting frame. An insulating layer is provided on the outside of the plurality of copper conductors.

[0010] Multiple copper conductors can be fixed by setting anti-torsion ropes and supporting frames.

[0011] According to the halogen-free flame-retardant fire-resistant cable, the support skeleton includes a support ring, a support rod and a fixing belt. The support ring is fixedly inserted into the anti-torsion rope, and a plurality of support rods are arranged at intervals on the outside of the support ring. The copper conductor is located between adjacent support rings, and a fixing belt is arranged between two adjacent support rods. The fixing belt is U-shaped, and the copper conductor is located in the depression of the fixing belt. The two ends of the fixing belt are respectively fixedly connected to the ends of the two adjacent support rods, and the copper conductor is clamped between the two adjacent support rods and the corresponding fixing belt.

[0012] When installing the support frame, the torsion-resistant rope passes through the support ring. The torsion-resistant rope and the support ring can be fixed by fixing glue, and then the copper conductors are clamped one by one between two adjacent support rods. Finally, the copper conductors are fixed between the support rods and the fixing belt with a fixing belt. When the outside of the cable burns, the insulating layer on the outside of the copper conductor melts due to heat, and the copper conductors in the cable core can be prevented from sticking together under the support of the support frame, thereby preventing the copper conductors from touching each other and causing a short circuit.

[0013] According to the halogen-free flame-retardant fire-resistant cable, the first folding rod is provided with a groove capable of accommodating a portion of the second folding rod.

[0014] By arranging the 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 a part of the second folding rod, so that the angle between the first folding rod and the second folding rod can be reduced.

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

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

[0017] According to the halogen-free flame-retardant fire-resistant cable, the armor layer is formed by wrapping a steel tape.

[0018] When the cable is produced, the armor layer is formed by winding a steel belt; by setting the armor layer, when the outer sheath of the cable is damaged, the armor layer can protect the internal cable core.

[0019] According to the halogen-free flame-retardant fire-resistant cable, the filling layer is formed by filling with ceramic fire-resistant filling rope.

[0020] When producing cables, ceramicized refractory filling ropes are used to fill the outside of the cable core, so that the outside of the cable core has better roundness, which makes it easier to wrap the armor layer.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 A three-dimensional diagram of a halogen-free flame-retardant fire-resistant cable.

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

[0025] Figure 3 It is a three-dimensional diagram 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 stereoscopic diagram of the flame retardant layer of a halogen-free flame retardant fire-resistant cable.

[0027] Figure 5 The present invention is a stereoscopic diagram of a first folding rod of a halogen-free flame-retardant fire-resistant cable.

[0028] Figure 6 The figure is a three-dimensional diagram of a second folding rod of a halogen-free flame-retardant fire-resistant cable.

[0029] Among them: 1. outer protective layer; 2. flame retardant layer; 21. first ring; 211. mounting block; 22. second ring; 23. third ring; 24. first folding rod; 241. spike; 242. groove; 25. second folding rod; 251. through hole; 26. telescopic cutting ring; 27. guide rod; 28. spring; 29. ​​pull rope; 291. fixing block; 3. armor layer; 4. filling layer; 5. cable core; 51. torsion-resistant rope; 52. supporting frame; 521. supporting ring; 522. supporting rod; 523. fixing belt; 53. copper conductor; 531. insulating layer. DETAILED DESCRIPTION

[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 purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, "greater than", "less than", "exceed" 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" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] Reference Figure 1-Figure 6The present invention discloses a halogen-free flame-retardant fire-resistant cable, 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 the outside to the inside, wherein the outer sheath 1 is made of a cross-linked polyethylene material; the flame-retardant layer 2 comprises a first ring 21, a second ring 22 and a third ring 23 arranged in sequence, wherein the first ring 21 and the third ring 23 are fixedly sleeved on the armor layer 3, and the second ring 22 is slidably sleeved on the armor layer 3, a plurality of mounting blocks 211 are arranged on opposite sides of the first ring 21 and the second ring 22, a plurality of first folding rods 24 and a second folding rod 25 are arranged between the first ring 21 and the second ring 22, one end of each of the plurality of first folding rods 24 is rotatably connected to the mounting block 211 on the first ring 21, and one end of each of the plurality of second folding rods 25 is rotatably connected to the mounting block 211 on the second ring 22 The block 211 is rotatably connected, the other ends of the multiple first folding rods 24 are rotatably connected with the other ends of the multiple second folding rods 25, and a telescopic cutting ring 26 is provided at the connection point. A spike portion 241 is provided on the top of the other end of the first folding rod 24. The third ring 23 is provided with a plurality of guide rods 27 on the side opposite to the second ring 22. One ends of the multiple guide rods 27 are slidably penetrated in the second ring 22. A spring 28 is provided on the outside of the multiple 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. The second ring 22 is provided with a plurality of pull ropes 29 on one side of the third ring 23. One end of the plurality of pull ropes 29 is provided with a fixed block 291. The fixed block 291 is fixedly connected to the armor layer 3. The fixed block 291 is a heat-sensitive material, and the spring 28 is in a compressed state.

[0035] Specifically, in the flame retardant layer 2, except for the fixed block 291 which is made of heat-sensitive material, the other parts are all made of high-temperature resistant metal materials; when producing the cable, the cable core 5 is first coated with a filling material to form a filling layer 4, the surface of the filling layer 4 is trimmed, the armor layer 3 is coated on the surface of the filling layer 4, the flame retardant layer 2 is installed on the armor layer 3, and finally the outer sheath 1 is arranged on the surface of the flame retardant layer 2; the melting point of the fixed block 291 is lower than the melting point of the outer sheath 1. When the cable encounters an external fire during use, the outer sheath 1 will become soft when heated, and when the temperature gradually rises, the outer sheath 1 will burn, the flame retardant layer 2 will work, the fixed block 291 will melt when heated, and when the fixed block 291 melts, the connection between the pull rope 29 and the armor layer 3 is disconnected, and the spring 28 gradually changes from a contracted state to a natural state. The spring 28 is stretched along the guide rod 27. During this process, the spring 28 provides a thrust to the second ring 22. The spring 28 pushes the second ring 22 toward the first ring 21. One end of the first folding rod 24 rotates along the mounting block 211 of the first ring 21, one end of the second folding rod 25 rotates along the mounting block 211 of the second ring 22, and the other end of the first folding rod 24 rotates along the other end of the second folding rod 25. The angle between the first folding rod 24 and the second folding rod 25 gradually decreases, 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 with the movement of the second telescopic rod, and the diameter of the telescopic cutting ring 26 gradually increases. During this process, the spike portion 241 can pierce the outer sheath 1, and the telescopic cutting ring 26 can cut the outer sheath 1.

[0036] Optionally, the cable core 5 includes an anti-torsion rope 51, a supporting skeleton 52 and a copper conductor 53, wherein the supporting skeleton 52 is fixedly connected to the anti-torsion rope 51, a plurality of copper conductors 53 are provided, and the plurality of copper conductors 53 are distributed in a ring-shaped and equidistant manner on the outside of the anti-torsion rope 51, the plurality of copper conductors 53 are all passed through the supporting skeleton 52, and an insulating layer 531 is provided on the outside of the plurality of copper conductors 53.

[0037] Optionally, the support skeleton 52 includes a support ring 521, a support rod 522 and a fixing belt 523. The support ring 521 is fixedly inserted into the anti-torsion rope 51. A plurality of support rods 522 are spaced apart on the outside of the support ring 521. The copper conductor 53 is located between adjacent support rings 521. A fixing belt 523 is provided between two adjacent support rods 522. The fixing belt 523 is U-shaped. The copper conductor 53 is located in the recess of the fixing belt 523. Both ends of the fixing belt 523 are fixedly connected to the ends of the two adjacent support rods 522 respectively. The copper conductor 53 is clamped between the two adjacent support rods 522 and the corresponding fixing belt 523.

[0038] Optionally, the first folding rod 24 is provided with a groove 242 capable of accommodating a portion of the second folding rod 25 .

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

[0040] Optionally, the armor layer 3 is formed by wrapping a steel belt.

[0041] Optionally, the filling layer 4 is formed by ceramicized refractory filling ropes.

[0042] Specifically, when producing the cable, first install the support frame 52 on the anti-torsion rope 51, and the anti-torsion rope 51 passes through the support ring 521. The anti-torsion rope 51 and the support ring 521 can be fixed by fixing glue, and then the copper conductors 53 are clamped one by one between the two adjacent support rods 522, and finally the copper conductors 53 are fixed between the support rods 522 and the fixing belt 523, and the ceramic fire-resistant filling rope is used to fill the outside of the cable core 5 so that the outside of the cable core 5 has a better roundness, and then the armor layer 3 is coated on the surface of the filling layer 4, and the flame retardant layer 2 is installed on the armor layer 3, and finally the outer sheath 1 is arranged 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 the cable encounters an external fire during use, the outer sheath 1 will become soft when heated, and when the temperature gradually rises, the outer sheath 1 will burn, the flame retardant layer 2 will work, and the fixing block 291 will melt when heated. After the block 291 melts, the connection between the pull rope 29 and the armor layer 3 is disconnected, and the spring 28 gradually changes from a contracted state to a natural state. The spring 28 is stretched 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 toward 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 angle between the first folding rod 24 and the second folding rod 25 gradually decreases, 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 with the movement of the second telescopic rod, and the diameter of the telescopic cutting ring 26 gradually increases. During this process, the spike portion 241 can pierce the outer sheath 1, and the telescopic cutting ring 26 can cut the outer sheath 1.

[0043] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A halogen-free flame-retardant fire-resistant cable, characterized in that: The cable comprises an outer sheath, a flame retardant layer, an armor layer, a filling layer and a cable core, which are sequentially arranged from the outside to the inside, and the outer sheath is made of a cross-linked polyethylene material; The flame retardant layer includes a first ring, a second ring and a third ring arranged in sequence, the first ring and the third ring are fixedly sleeved on the armor layer, the second ring is slidably sleeved on the armor layer, a plurality of mounting blocks are arranged on opposite sides of the first ring and the second ring, a plurality of first folding rods and a second folding rod are arranged between the first ring and the second ring, one end of the plurality of first folding rods are rotatably connected to the mounting block on the first ring, one end of the plurality of second folding rods are rotatably connected to the mounting block on the second ring, and the other end of the plurality of first folding rods are rotatably connected to the plurality of second The other end of the folding rod is rotatably connected, and a telescopic cutting ring is provided at the connection. A spike portion is provided at the top of the other end of the first folding rod. The third ring is provided with multiple guide rods on the side opposite to the second ring, and one end of the multiple guide rods are slid through the second ring. Springs are provided on the outside of the multiple 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. The second ring is provided with multiple pull ropes on one side of the third ring, and one end of the multiple pull ropes is provided with a fixed block, which is fixedly connected to the armor layer, the fixed block is a heat-sensitive material, and the spring is in a compressed state.

2. A halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that: The cable core includes an anti-torsion rope, a supporting frame and a copper conductor. The supporting frame is fixedly connected to the anti-torsion rope. A plurality of copper conductors are provided. The plurality of copper conductors are distributed in a circular shape and are equidistantly arranged outside the anti-torsion rope. The plurality of copper conductors are all passed through the supporting frame. An insulating layer is provided outside the plurality of copper conductors.

3. A halogen-free flame-retardant fire-resistant cable according to claim 2, characterized in that: The support frame includes a support ring, a support rod and a fixing belt. The support ring is fixedly inserted into the anti-torsion rope. A plurality of support rods are arranged at intervals on the outside of the support ring. The copper conductor is located between adjacent support rings. A fixing belt is arranged between two adjacent support rods. The fixing belt is U-shaped. The copper conductor is located in the depression of the fixing belt. Both ends of the fixing belt are fixedly connected to the ends of the two adjacent support rods respectively. The copper conductor is clamped between the two adjacent support rods and the corresponding fixing belt.

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 which can accommodate part of the second folding rod.

5. The halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that: One end of the second folding rod rotatably connected to the first folding rod is provided with a through hole, and the telescopic cutting ring is passed through the through hole.

6. A halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that: The armor layer is formed by wrapping a steel belt.

7. The halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that: The filling layer is formed by filling with ceramic refractory filling ropes.

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