A halogen-free, low-smoke, highly flame-retardant power cable

Abstract

The present invention discloses a halogen-free, low-smoke, and highly flame-retardant power cable, which relates to the technical field of cables; it comprises a cable core, an insulating layer is wrapped around the outer side of the cable core, a plurality of fire-extinguishing components are circumferentially arranged on the outer wall of the insulating layer, a flame-retardant component is arranged on the outer side of the fire-extinguishing component, an inner sheath layer is arranged on the outer side of the flame-retardant component, a heat-insulating layer is wrapped around the outer side of the inner sheath layer, an outer sheath layer is wrapped around the outer side of the heat-insulating layer, each of the fire-extinguishing components comprises two elastic sheets, one end of each of the two elastic sheets is fixedly connected to the insulating layer, a fire-extinguishing pipe is arranged between each of the two elastic sheets, each of the fire-extinguishing pipes is filled with fire-extinguishing powder, the flame-retardant component comprises a plurality of elastic plates, the inner ends of the elastic plates on the corresponding sides of each of the two elastic sheets are fixedly connected, an elastic bin is arranged between the elastic plates, and each of the elastic bins is filled with flame retardant; the present invention can effectively improve the flame-retardant and fire-extinguishing effects.

Description

Technical Field

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

[0002] Power cables are cable products used to transmit and distribute high-power electric energy in the trunk lines of power systems, while low-smoke halogen-free cables refer to cable products that use low-smoke, halogen-free materials as insulation and sheath materials. To ensure the normal operation of power cables, power cables are often provided with a flame retardant layer on the surface to prevent the power cables from being heated and burned. Once the cables are heated and burned, the fire can easily spread to the location of the battery core, making it impossible for the cables to maintain normal power transportation functions.

[0003] The Chinese patent application number CN202111148303.4 discloses a halogen-free, low-smoke, highly flame-retardant power cable, including a core conductor, a cross-linked polyethylene insulation layer is coated on the outside of the core conductor, a filling layer is arranged on the outside of the cross-linked polyethylene insulation layer, a first water-blocking tape wrapping layer is arranged on the outside of the filling layer, a halogen-free, low-smoke, flame-retardant inner sheath is arranged on the outside of the first water-blocking tape wrapping layer, a special-shaped copper sleeve shielding layer is arranged between the halogen-free, low-smoke, flame-retardant inner sheath and the first water-blocking tape wrapping layer, and the heat of combustion of the halogen-free, low-smoke, flame-retardant inner sheath is transferred to the special-shaped copper sleeve screen When the shielding layer is formed, the special-shaped copper sheath shielding layer will expand due to heat and expand to fit closely to the inner wall of the halogen-free low-smoke flame-retardant inner sheath, forming a vacuum layer between the special-shaped copper sheath shielding layer and the first water-blocking tape sheath; although the above-mentioned cable can prevent heat from being transferred to the core conductor to prevent flame retardancy to a certain extent, when the cable catches fire, it is impossible to use its own characteristics to perform flame retardancy and fire extinguishing in time, and when the cable continues to catch fire, it is easy to continuously transfer heat to the core, causing the core to continue to be hot, which can easily lead to the loss of the cable's function of transmitting electricity, causing unnecessary losses.

[0004] Therefore, a halogen-free, low-smoke, and highly flame-retardant power cable is invented to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a halogen-free, low-smoke, and highly flame-retardant power cable, which effectively solves the problems in the above-mentioned background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a halogen-free, low-smoke, high-flame-retardant power cable, comprising a cable core, an insulating layer wrapped around the outer side of the cable core, a plurality of fire extinguishing components arranged circumferentially on the outer wall of the insulating layer, a flame retardant component is arranged outside the plurality of fire extinguishing components, an inner sheath layer is arranged outside the flame retardant component, a heat insulation layer is wrapped around the outer side of the inner sheath layer, and an outer sheath layer is wrapped around the outer side of the heat insulation layer;

[0007] Each of the fire extinguishing components comprises two elastic sheets extending longitudinally, one end of each of the two elastic sheets is fixedly connected to the insulating layer, a fire extinguishing pipe extending longitudinally is arranged between each of the two elastic sheets, and each of the fire extinguishing pipes is filled with fire extinguishing powder;

[0008] The flame retardant assembly includes a plurality of elastic plates corresponding one to one with the fire extinguishing pipes and extending longitudinally, the other ends of each two elastic plates are fixedly connected to the inner ends of the elastic plates on the corresponding sides, and a longitudinally extending elastic bin is provided between two adjacent elastic plates, and each elastic bin is filled with a flame retardant.

[0009] Each of the fire extinguishing pipes is longitudinally spaced apart and provided with a plurality of fire extinguishing holes which are communicated with the interior of the fire extinguishing pipe and open radially outwards, and each of the fire extinguishing holes is provided with a first film.

[0010] Each of the elastic bins is longitudinally spaced apart and provided with a plurality of flame-retardant holes which are connected to the interior of the bin and open radially outward, and each of the flame-retardant holes is provided with a second film.

[0011] The flame retardant assembly also includes a plurality of extrusion blocks which are circumferentially spaced and correspond one to one with the elastic plates, one end of each of the extrusion blocks is fixedly connected to the inner jacket layer, and the other end of each of the extrusion blocks is fixedly connected to the elastic plate on its corresponding side.

[0012] Technical effects and advantages of the present invention:

[0013] 1. The elastic chamber is squeezed together by two adjacent elastic plates, so that the flame retardant in the elastic chamber is squeezed out through the flame retardant hole to the gap between the multiple elastic plates and the inner sheath layer. Under the action of the flame retardant, the flame retardant can better block the spread of the fire, and the gap between the inner sheath layer and the multiple elastic plates gradually increases, which can not only block the spread of the fire to a certain extent, but also block the heat from being transferred to the inside, thereby further ensuring the stability of the cable in transporting electricity.

[0014] 2. The fire extinguishing tube is squeezed by the elastic plate and the elastic sheet, so that the fire extinguishing powder in the fire extinguishing tube is pressurized and sprayed out from the fire extinguishing hole to extinguish the fire. The pressurized fire extinguishing powder can better cover the fire, which can not only improve the efficiency of fire extinguishing, but also effectively prevent the spread of fire and effectively prevent the tendency of the fire to burn inward. At the same time, the gaps between multiple elastic plates and the inner sheath layer can prevent the direct transfer of heat, thereby further ensuring the stability of the cable transporting electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional schematic diagram of the present invention.

[0016] Figure 2 It is a stepped axonometric view of the present invention.

[0017] Figure 3 For the present invention Figure 2 A is an enlarged view of the middle image.

[0018] Figure 4 It is a schematic diagram of the structure of the fire extinguishing component and the flame retardant component of the present invention.

[0019] Figure 5 For the present invention Figure 4 Enlarged view of B.

[0020] In the figure: 1. cable core; 2. insulation layer; 3. fire extinguishing component; 301. elastic sheet; 302. fire extinguishing pipe; 303. fire extinguishing powder; 304. fire extinguishing hole; 305. first film; 4. flame retardant component; 401. elastic plate; 402. elastic bin; 403. flame retardant; 404. flame retardant hole; 405. second film; 406. extrusion block; 5. inner sheath layer; 6. insulation layer; 7. outer sheath layer; 8. discharge hole; 9. reinforcement layer; 10. filling layer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] Although the cables in the prior art can prevent heat from being transferred to the core conductors to a certain extent, when the cable catches fire, it is unable to promptly utilize its own characteristics to perform flame retardancy and fire extinguishing. Furthermore, when the cable continues to catch fire, it is easy for the heat to continue to be transferred to the core, causing the core to continue to be high in temperature, which can easily lead to the loss of the cable's ability to transport electricity, resulting in unnecessary losses. This embodiment is specially invented to solve the above problems.

[0024] like Figure 1 - Figure 3As shown, a halogen-free, low-smoke, high-flame-retardant power cable according to an embodiment of the present invention comprises a cable core 1, an insulating layer 2 is wrapped around the outer side of the cable core 1, a plurality of fire extinguishing components 3 are circumferentially arranged on the outer wall of the insulating layer 2, a flame retardant component 4 is arranged on the outer side of the plurality of fire extinguishing components 3, an inner sheath layer 5 is arranged on the outer side of the flame retardant component 4, a heat insulation layer 6 is wrapped around the outer side of the inner sheath layer 5, an outer sheath layer 7 is wrapped around the outer side of the heat insulation layer 6, the flame retardant component 4 comprises a plurality of elastic plates 401 corresponding to the fire extinguishing pipes 302 and extending longitudinally, the other ends of each two elastic sheets 301 are fixedly connected to the inner ends of the elastic plates 401 on the corresponding sides, a longitudinally extending elastic chamber 402 is provided between two adjacent elastic plates 401, and each elastic chamber 402 is filled with There is a flame retardant 403, and the flame retardant component 4 also includes a plurality of extrusion blocks 406 which are circumferentially spaced and correspond one to one with the elastic plates 401, one end of each extrusion block 406 is fixedly connected to the inner sheath layer 5, a reinforcement layer 9 is fixedly connected between the inner sheath layer 5 and the outer sheath layer 7, the other end of each extrusion block 406 is fixedly connected to the elastic plate 401 on its corresponding side, a filling layer 10 is provided between the outer wall of the insulating layer 2 and the plurality of elastic plates 401, the inner sheath layer 5 and the outer sheath layer 7 are both made of halogen-free and low-smoke flame retardant material, the extrusion blocks 406 are made of flame retardant material that expands when heated, and a plurality of flame retardant holes 404 which are longitudinally spaced and connected to the interior of the elastic chamber 402 and open radially outward are provided, and a second film 405 is provided in each flame retardant hole 404.

[0025] When the cable catches fire due to external factors, the fire spreads from the outer sheath layer 7 to the reinforcement layer 9 and the insulation layer 6. The outer sheath layer 7 and the inner sheath layer 5 are both made of halogen-free and low-smoke flame-retardant materials, which can play a certain flame-retardant role and reduce the amount of smoke during combustion. At this time, the combustion heat is transferred to the extrusion block 406 through the inner sheath layer 5. Since the extrusion block 406 is made of heat-expanding flame-retardant materials, the extrusion block 406 expands inwards due to the heat, and the extrusion block 406 pushes the elastic plate 401 inwards to elastically The elastic plates 401 and the elastic sheets 301 are both made of elastic flame-retardant materials, so that the gaps between the multiple elastic plates 401 and the inner sheath layer 5 gradually increase, and the elastic plates 401 can squeeze the filling layer 10, and the filling layer 10 can support the elastic plates 401, thereby effectively improving the stability of the elastic plates 401. The elastic plates 401 elastically deform inwardly to squeeze the elastic sheets 301, and the two elastic sheets 301 gradually approach the fire extinguishing pipe 302 without contacting the fire extinguishing pipe 302.

[0026] At the same time, the two adjacent elastic plates 401 elastically deform and squeeze the elastic bin 402 on the corresponding side, causing the elastic bin 402 to undergo elastic deformation. Under the pressure of the flame retardant 403, the second film 405 in the flame retardant hole 404 is broken, and the second film 405 can protect the flame retardant 403 in the elastic bin 402 that is not heated. At this time, the flame retardant 403 is squeezed out through the flame retardant hole 404 into the gap between the inner sheath layer 5 and the multiple elastic plates 401. When the fire continues to spread inward, under the action of the flame retardant 403, the flame retardant 403 can block the spread of the fire and extinguish the fire.

[0027] The elastic chamber 402 is squeezed together by two adjacent elastic plates 401, so that the flame retardant 403 in the elastic chamber 402 is squeezed out through the flame retardant hole 404 to the gap between the multiple elastic plates 401 and the inner sheath layer 5. Under the action of the flame retardant 403, the flame retardant 403 can better block the spread of fire, and the gap between the inner sheath layer 5 and the multiple elastic plates 401 gradually increases, which can not only play a certain blocking role in the spread of fire, but also prevent heat from being transferred to the inside, thereby further ensuring the stability of the cable transporting electricity.

[0028] Example 2

[0029] After the flame retardant 403 in the elastic chamber 402 is completely squeezed out, the fire still has the tendency to spread inwards and continues to spread to the inner sheath layer 5. At this time, no flame retardant 403 is squeezed out to provide flame retardancy and the fire cannot be flame retardant again. In order to enable the cable to transport electricity normally, further improvements are made based on the above embodiments.

[0030] like Figure 4 - Figure 5 As shown, each fire extinguishing component 3 includes two longitudinally extending elastic sheets 301, one end of each two elastic sheets 301 is fixedly connected to the insulating layer 2, a longitudinally extending fire extinguishing pipe 302 is provided between each two elastic sheets 301, and each fire extinguishing pipe 302 is filled with fire extinguishing powder 303, and the flame retardant component 4 also includes a plurality of extrusion blocks 406 distributed circumferentially and corresponding to the elastic plates 401, one end of each extrusion block 406 is fixedly connected to the inner sheath layer 5, and the other end of each extrusion block 406 is fixedly connected to the elastic plate 401 on its corresponding side, and each elastic plate 401 is longitudinally spaced apart with a plurality of discharge holes 8 that penetrate inside and outside and correspond to the fire extinguishing holes 304 one by one, the bending curvature of each elastic sheet 301 is toward the fire extinguishing pipe 302 on its corresponding side, each fire extinguishing pipe 302 is longitudinally spaced apart with a plurality of fire extinguishing holes 304 that are connected to its interior and open radially outward, and each fire extinguishing hole 304 is provided with a first film 305.

[0031] When the heat of the burning cable continues to be transferred to the extrusion block 406, the extrusion block 406 expands to the limit state. During the process of the extrusion block 406 pushing the multiple elastic plates 401 to elastically deform inward to the limit position, the flame retardant 403 in the elastic compartment 402 between the two adjacent elastic plates 401 is completely squeezed out. At the same time, the gap between the multiple elastic plates 401 and the inner sheath layer 5 gradually increases, which can also indirectly prevent the spread of the fire. Since the direction of the elastic deformation of the elastic sheet 301 is toward the fire extinguishing pipe 302, the elastic plate 401 squeezes the elastic sheet 301, and the elastic sheet 301 Elastic deformation occurs to squeeze the fire extinguishing pipe 302, and the first film 305 can protect the fire extinguishing powder 303 in the fire extinguishing pipe 302 at the unheated position. Then the fire extinguishing pipe 302 at the heated position undergoes elastic deformation, so that the first film 305 in the fire extinguishing hole 304 is broken, and the discharge hole 8 on the elastic plate 401 is in contact and connected with the fire extinguishing hole 304 on the fire extinguishing pipe 302 at the heated position, so that the fire extinguishing powder 303 in the fire extinguishing pipe 302 is sprayed through the fire extinguishing hole 304 and the discharge hole 8 to the gap between the multiple elastic plates 401 and the inner sheath layer 5, so that the fire extinguishing powder 303 extinguishes the fire.

[0032] The fire extinguishing tube 302 is squeezed by the elastic plate 401 and the elastic sheet 301, so that the fire extinguishing powder 303 in the fire extinguishing tube 302 is pressurized and sprayed out from the fire extinguishing hole 304 to extinguish the fire. The pressurized fire extinguishing powder 303 can better cover the fire, which can not only improve the efficiency of fire extinguishing, but also effectively prevent the spread of fire and effectively prevent the tendency of the fire to burn inward. At the same time, the gaps between the multiple elastic plates 401 and the inner sheath layer 5 can prevent the direct transfer of heat, thereby further ensuring the stability of the cable transporting electricity.

[0033] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A halogen-free, low-smoke, high-flame-retardant power cable, characterized in that: It comprises a cable core, the outer side of the cable core is wrapped with an insulating layer, a plurality of fire extinguishing components are circumferentially spaced on the outer wall of the insulating layer, each of the fire extinguishing components comprises two elastic sheets extending longitudinally, one end of each of the two elastic sheets is fixedly connected to the insulating layer, a fire extinguishing pipe extending longitudinally is arranged between each of the two elastic sheets, each of the fire extinguishing pipes is filled with fire extinguishing powder, the bending arc of each of the elastic sheets is toward the fire extinguishing pipe on its corresponding side, each of the fire extinguishing pipes is longitudinally spaced and provided with a plurality of fire extinguishing holes communicating with the interior thereof and opening radially outward, and a first film is arranged in each of the fire extinguishing holes; A flame retardant component is arranged on the outside of the plurality of fire extinguishing components, an inner sheath layer is arranged on the outside of the flame retardant component, an insulation layer is wrapped on the outside of the inner sheath layer, and an outer sheath layer is wrapped on the outside of the insulation layer. The flame retardant component includes a plurality of elastic plates corresponding to the fire extinguishing pipes one by one and extending longitudinally, the other end of each two elastic plates is fixedly connected to the inner end of the elastic plate on the corresponding side, and a longitudinally extending elastic bin is commonly arranged between two adjacent elastic plates, each elastic bin is filled with a flame retardant, and each elastic bin is longitudinally spaced apart and provided with a plurality of flame retardant holes which are connected to the inside and open radially outward, and a second film is arranged in each flame retardant hole. The flame retardant component also includes a plurality of extrusion blocks which are circumferentially spaced apart and correspond to the elastic plates one by one, and the extrusion blocks are made of flame retardant material which expands when heated, one end of each extrusion block is fixedly connected to the inner sheath layer, and the other end of each extrusion block is fixedly connected to the elastic plate on the corresponding side, and each elastic plate is longitudinally spaced apart and provided with a plurality of discharge holes which are connected inside and outside and correspond to the fire extinguishing holes one by one.

2. The halogen-free, low-smoke, high-flame-retardant power cable according to claim 1, characterized in that: A reinforcement layer is fixedly connected between the inner sheath layer and the outer sheath layer.

3. The halogen-free, low-smoke, high-flame-retardant power cable according to claim 2, characterized in that: A filling layer is provided between the outer wall of the insulating layer and the plurality of elastic plates.

4. The halogen-free, low-smoke, high-flame-retardant power cable according to claim 3, characterized in that: The inner sheath layer and the outer sheath layer are both made of halogen-free and low-smoke flame-retardant materials.

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