Direct-current flame-retardant tensile cable for charging pile

Abstract

The invention discloses a direct-current flame-retardant tensile cable for a charging pile, and relates to the technical field of cables, the direct-current flame-retardant tensile cable comprises a conductor, the outer side of the conductor is wrapped with an insulating layer, the outer side of the insulating layer is wrapped with a shielding layer, the outer side of the shielding layer is provided with a protective layer, the direct-current flame-retardant tensile cable further comprises a flame-retardant assembly and a tensile assembly, and the flame-retardant assembly comprises a plurality of fixing pieces; a fire extinguishing chamber is formed by every two adjacent partition pieces, the fixing piece, the protective layer and the shielding layer, and the tensile assembly comprises a plurality of tensile pieces. Through arrangement of the flame-retardant pieces, when a fire breaks out in the fire extinguishing chamber, a fire breakout point can be covered to form a sealed space, and therefore the good flame-retardant effect is achieved; and through cooperation of the tensile member, the flame-retardant member, the telescopic air bag and inert gas in the fire extinguishing chamber, the tensile capability of the tensile member can be enhanced, so that the problem of poor flame-retardant and tensile capability of the existing charging pile cable is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a direct current flame-retardant and tensile-resistant cable for a charging pile. Background Art

[0002] With the rapid development of the new energy vehicle industry, new energy charging piles have become popular. However, when using new energy charging piles to charge new energy vehicles, due to the frequent use of charging cables, the inside of the cables is always in a high temperature state, which is very easy to catch fire from the inside. Once the cables catch fire, it is very easy to cause new energy vehicles to catch fire, thereby causing safety problems, resulting in people’s property losses, and even endangering people’s lives.

[0003] When using a charging pile, when unplugging the charging head of the charging cable and then inserting it into the charging port of the new energy vehicle, it is usually necessary to pull the charging cable, so the charging cable is often stretched. When the charging cable is stretched, the conductive core inside the cable and the protective sheath wrapped on the outside are easily stretched, which can easily cause damage to the conductive core. When the new energy vehicle is parked at the corresponding parking space where the charging pile is damaged, in order to save trouble, the charging cable on the adjacent charging pile is usually directly pulled to the parking space to charge the new energy vehicle. During this process, the charging cable will be subjected to continuous and strong stretching. This method of use will cause damage to the inside of the cable. Summary of the invention

[0004] The object of the present invention is to provide a DC flame-retardant tensile-resistant cable for a charging pile, so as to solve the technical problem of poor tensile strength and flame-retardancy of the existing charging pile cables mentioned in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a DC flame-retardant tensile cable for a charging pile, comprising a conductor, an insulating layer wrapped around the outside of the conductor, a shielding layer wrapped around the outside of the insulating layer, a protective layer arranged on the outside of the shielding layer, and further comprising: A flame retardant assembly, the flame retardant assembly comprising a plurality of fixings fixedly arranged on the shielding layer, each of the fixings being rotatably provided with a partition, two adjacent partitions and the fixings and the protective layer and the shielding layer together forming a fire extinguishing chamber for extinguishing a fire point; The tensile assembly includes a plurality of tensile members fixedly arranged on the inner wall of the protective layer, each of the tensile members is slidably connected to the partition, and is used to increase the tensile resistance of the protective layer.

[0006] Preferably, each of the fire extinguishing chambers is provided with a plurality of flame retardant parts capable of covering the shielding layer.

[0007] Preferably, two sliding members are slidably provided on each of the fixing members, and telescopic airbags are fixedly provided on opposite ends of the two sliding members on the same fixing member.

[0008] Preferably, one end of each of the telescopic airbags away from the corresponding sliding member is fixedly connected to the corresponding partition member.

[0009] Preferably, swing members are hingedly connected to both sides of the flame retardant member, and one end of the swing member away from the corresponding flame retardant member is hingedly connected to the corresponding sliding member.

[0010] Preferably, the telescopic airbag is connected to the adjacent fire extinguishing chamber through a connecting pipe, and the interiors of the fire extinguishing chamber and the telescopic airbag are both filled with inert gas.

[0011] Preferably, the tensile component further comprises heat expansion components fixedly arranged on both sides of each flame retardant component, and each tensile component is slidably connected to the corresponding heat expansion component.

[0012] Preferably, a plurality of blocking members corresponding to the thermal expansion members are fixedly provided on the tensile member.

[0013] Preferably, a reinforcement layer is fixedly provided on the outer side of the protective layer.

[0014] Preferably, the tensile member is in a spiral shape.

[0015] The beneficial effects of the present invention are: 1. By setting a flame retardant that can cover the fire point, when a fire occurs, the telescopic airbag corresponding to the fire extinguishing chamber can discharge the gas, so that the sliding part pulls the flame retardant toward the conductor axis through the swinging part, so that multiple flame retardants are in close contact with each other and the flame retardant is in close contact with the shielding layer, so that a closed space is formed between the multiple flame retardants corresponding to the fire point, which has the effect of extinguishing the fire and preventing the spread of the fire, and the inert gas can play a certain role in extinguishing the fire.

[0016] 2. The anti-tensile member can resist part of the tensile force by deformation. When the tensile force increases, the anti-tensile member can resist part of the external tensile force by means of the tensile resistance of the corrugated part of the flame retardant part through the blocking member and the heat expansion member.

[0017] 3. When the external tensile force increases again, the tensile parts obtain stronger tensile resistance through the flame retardant parts with the help of telescopic airbags and the exchange of inert gas in the adjacent fire extinguishing room, and play a better tensile effect, preventing the insulation layer, shielding layer and conductor from being stretched directly when the reinforcement layer and the protective layer are subjected to tensile force, thereby protecting the insulation layer, shielding layer and conductor.

[0018] 4. Through the rotation of the separator and the reverse force of the heat expansion parts and flame retardant parts on the tensile parts, part of the external torsional force on the reinforcement layer can be offset, preventing the external torsional force from being directly transmitted to the internal cable conductor, thereby achieving an anti-torsion effect.

[0019] 5. When the reinforcing layer is subjected to a torsional force in the opposite direction of the spiral extension direction of the tensile member, a part of the torsional force can be offset by the reverse stretching and rotation of the partition, and the torsional force of the tensile member will act on the telescopic airbag through the thermal expansion member, the flame retardant member, the swing member and the sliding member, thereby causing the air pressure of the telescopic airbag to change, resulting in a change in the volume of the telescopic airbag, which in turn affects the stability of the air pressure inside the fire extinguishing chamber and the telescopic airbag, so that the telescopic airbag gives a reaction force to the tensile member through the sliding member, the swing member, the flame retardant member and the thermal expansion member, which has a reverse pulling effect on the arching of the tensile member, delays and suppresses the arching of the tensile member, prevents the torsional force from directly acting on the conductor inside the cable, and increases the torsional resistance of the cable.

[0020] 6. By setting up the heat expansion component, when a fire occurs inside the fire extinguishing chamber, the heat expansion component can absorb heat and expand. When the swinging component pulls the flame retardant component to move toward the axis of the conductor, the heat expansion component pushes the flame retardant component to move in the same direction. After the flame retardant component contacts the shielding layer, the heat expansion component squeezes the flame retardant component to ensure that the flame retardant component is in close contact with the shielding layer, and that multiple flame retardants are in close contact with each other, completely sealing the fire point, achieving a better fire extinguishing effect, and preventing the fire from spreading to other locations, causing the entire cable to catch fire and triggering the combustion of new energy vehicles, resulting in greater property losses and casualties. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a full-section front view plan view of the present invention.

[0022] Figure 2 This is a full left-side plan view of the present invention after removing the reinforcement layer and the protective layer.

[0023] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0024] Figure 4 It is a full cutaway left-side plan view of the fire extinguishing chamber in the present invention.

[0025] Figure 5 This is a state diagram of multiple flame retardant components of the present invention when extinguishing a fire.

[0026] Figure 6 It is a schematic diagram of the connection relationship between the tensile member, the separator and the blocking member in the present invention.

[0027] Figure 7 It is a schematic diagram of the parts of the tensile member in the present invention.

[0028] The reference numerals are: 1, conductor; 2, insulating layer; 3, shielding layer; 4, protective layer; 5. Flame retardant assembly; 501. Fixing member; 502. Partition member; 503. Fire extinguishing chamber; 504. Flame retardant member; 505. Sliding member; 506. Telescopic airbag; 507. Swinging member; 508. Connecting pipe; 509. Inert gas; 6. Tensile component; 601. Tensile member; 602. Thermal expansion member; 603. Blocking member; 7. Strengthening layer. DETAILED DESCRIPTION

[0029] 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1 With the rapid development of my country's new energy vehicle industry, new energy charging piles have become popular. However, when using new energy charging piles to charge new energy vehicles, due to the frequent use of charging cables, the inside of the cables is always in a high temperature state, which is very easy to catch fire from the inside. Once the cables catch fire, it is very easy to cause new energy vehicles to catch fire, thereby causing safety problems, resulting in people's property losses, and even endangering people's lives.

[0031] In order to solve the above technical problems, please refer to the attached drawings of the specification. Figure 1 and Figure 7As shown, a DC flame-retardant tensile-resistant cable for a charging pile according to an embodiment of the present invention includes a conductor 1, an insulating layer 2 is wrapped on the outside of the conductor 1, a shielding layer 3 is wrapped on the outside of the insulating layer 2, a protective layer 4 is arranged on the outside of the shielding layer 3, and also includes a flame-retardant component 5, the flame-retardant component 5 includes a plurality of fixings 501 fixedly arranged on the shielding layer 3, each fixing 501 is rotatably provided with a partition 502, two adjacent partitions 502 and the fixing 501 and the protective layer 4 and the shielding layer 3 together form a fire extinguishing chamber 503 for extinguishing the fire point, each fire extinguishing chamber 503 is provided with a plurality of flame-retardant components 504 capable of covering the shielding layer 3, and each fixing Two sliding members 505 are slidably provided on 501, and telescopic airbags 506 are fixedly provided at opposite ends of the two sliding members 505 on the same fixed member 501, and one end of each telescopic airbag 506 away from the corresponding sliding member 505 is fixedly connected to the corresponding partition 502, and swing members 507 are hingedly connected on both sides of the flame retardant member 504, and one end of the swing member 507 away from the corresponding flame retardant member 504 is hingedly connected to the corresponding sliding member 505, and the telescopic airbag 506 is connected to the adjacent fire extinguishing chamber 503 through a connecting pipe 508, and the interior of the fire extinguishing chamber 503 and the telescopic airbag 506 are filled with inert gas 509, and a reinforcing layer 7 is fixedly provided on the outside of the protective layer 4.

[0032] When in use, when a fire occurs inside the cable, the temperature inside the fire extinguishing chamber 503 rises sharply. The structure of the fire extinguishing chamber 503 can be referred to the drawings in the specification. Figure 4 It is understood that the inert gas 509 in the fire extinguishing chamber 503 expands rapidly, so that the inert gas 509 compresses the telescopic airbag 506 in the fire extinguishing chamber 503, so that the two telescopic airbags 506 in the fire extinguishing chamber 503 shrink, and the inert gas 509 in the telescopic airbag 506 is discharged into the adjacent fire extinguishing chamber 503 through the connecting pipe 508, so as to relieve the pressure, so that the telescopic airbag 506 drives the sliding member 505 to move in the direction of its corresponding partition 502. The sliding member 505 and the telescopic airbag 506 are both annular, which are not shown in detail in the figure.

[0033] The sliding member 505 drives the corresponding swinging member 507 to move toward the direction of the partition 502 on the side close to the shielding layer 3. The two hinges of each swinging member 507 are hingedly connected to the corresponding flame retardant member 504 and the sliding member 505 through a rotating shaft, so that the side where the swinging member 507 is hinged to the flame retardant member 504 moves downward, the angle between the swinging member 507 and the axis of the conductor 1 becomes smaller, and the side where the swinging member 507 is hinged to the flame retardant member 504 drives the flame retardant member 504 to move in the direction close to the conductor 1. The two swinging members 507 corresponding to the same flame retardant member 504 are in an eight-shaped shape.

[0034] When the gas inside the telescopic airbag 506 is reduced to a certain extent and the angle between the swinging member 507 and the axis of the conductor 1 is reduced to a certain extent, the multiple flame retardant parts 504 in the fire extinguishing chamber 503 are in close contact with the shielding layer 3 corresponding to the fire extinguishing chamber 503 where the fire occurs, thereby covering the fire point, and the multiple flame retardant parts 504 are in close contact with each other to form an enclosed space, which plays a role in fire extinguishing and isolation, prevents the spread of fire, and avoids the fire of the cable causing the fire of the new energy vehicle, causing a safety accident.

[0035] By setting up the flame retardant part 504 capable of covering the fire point, when a fire occurs, the telescopic airbag 506 can discharge the gas, so that the sliding part 505 can pull the flame retardant part 504 toward the axis of the conductor 1 through the swinging part 507, so that the multiple flame retardants 504 are in close contact with each other, and the flame retardant part 504 is in close contact with the shielding layer 3, so that a closed space is formed between the multiple flame retardants 504 corresponding to the fire point, which has the effect of extinguishing the fire and preventing the spread of the fire.

[0036] Embodiment 2 When using a charging pile, unplug the charging head of the charging cable and then insert it into the charging port of the new energy vehicle. It is usually necessary to pull the charging cable, so the charging cable is often stretched. When the charging cable is stretched, the conductive core inside the cable and the protective sheath wrapped on the outside are easily stretched, which can easily cause damage to the conductive core. When the new energy vehicle is parked at the corresponding parking space where the charging pile is damaged, in order to save trouble, the charging cable on the adjacent charging pile is usually directly pulled to the parking space to charge the new energy vehicle. During this process, the charging cable will be subjected to continuous and strong stretching. This method of use will cause damage to the inside of the cable, and in the process of moving the cable, due to the influence of the angle and the charging position, the cable will be twisted to a certain extent, thereby affecting or even damaging the conductive core inside the cable.

[0037] Based on the above embodiment 1, in order to solve the above technical problems, please refer to Figures 1 to 7 As shown, the adopted technical solution includes a conductor 1 and a tensile component 6, the tensile component 6 includes a plurality of tensile members 601 fixedly arranged on the inner wall of the protective layer 4, each tensile member 601 is slidably connected to the partition 502, and is used to increase the tensile resistance of the protective layer 4, the tensile component 6 also includes a thermal expansion member 602 fixedly arranged on both sides of each flame retardant member 504, each tensile member 601 is slidably connected to the corresponding thermal expansion member 602, a plurality of blocking members 603 corresponding to the thermal expansion member 602 are fixedly arranged on the tensile member 601, the shape of the tensile member 601 is spiral, and the cross-section of the tensile member 601 is I-shaped.

[0038] When the reinforcing layer 7 is stretched, the reinforcing layer 7 causes the protective layer 4 to drive the tensile member 601 to move and deform, so that the tensile member 601 is stretched, thereby causing the tensile member 601 to slide on the partition 502 and the heat expansion member 602, thereby preventing the internal conductor 1 from being stretched and causing damage to the conductor 1 when the reinforcing layer 7 and the protective layer 4 are stretched externally.

[0039] When the tensile force applied to the reinforcing layer 7 is relatively large, the protective layer 4 pulls the tensile member 601 to deform to a greater extent. After the tensile member 601 is deformed to a certain extent, the tensile member 601 drives the blocking member 603 thereon to contact and squeeze the corresponding heat expansion member 602, so that the heat expansion member 602 pulls the corresponding flame retardant member 504 to deform, and the middle part of the flame retardant member 504 is configured to be wavy, which can resist part of the tensile force and reduce the deformation degree of the tensile member 601, thereby increasing the tensile resistance of the tensile member 601.

[0040] When the tensile force on the reinforcing layer 7 is further increased, the reinforcing layer 7 and the protective layer 4 drive the tensile member 601 to deform to a greater extent, thereby overcoming the resistance provided by the multiple flame retardants 504. At this time, the flame retardants 504 can only delay the deformation of the tensile member 601. The tensile member 601 squeezes the sliding member 505 through the blocking member 603, the heat expansion member 602 and the flame retardant member 504, so that the sliding member 505 squeezes the telescopic airbag 506 fixed thereto, thereby delaying the deformation of the tensile member 601. After the telescopic airbag 506 is compressed, the inert gas 509 inside it is discharged into the adjacent fire extinguishing chamber 503 through the connecting pipe 508, thereby delaying the deformation of the tensile member 601.

[0041] Since the air pressure on both sides is equal, the telescopic airbags 506 in the adjacent fire extinguishing chambers 503 can be compressed and reduced in volume, thereby discharging the inert gas 509 in the telescopic airbags 506 in the adjacent fire extinguishing chambers 503 into the connected fire extinguishing chambers 503 and the fire extinguishing chambers 503 corresponding to the squeezed telescopic airbags 506, thereby causing a chain change, allowing the inert gas 509 in multiple fire extinguishing chambers 503 and the telescopic airbags 506 to flow, thereby achieving a better effect of resisting the deformation of the tensile member 601, improving the tensile capacity of the tensile member 601, and preventing the insulating layer 2, the shielding layer 3 and the conductor 1 from being directly stretched when the reinforcing layer 7 and the protective layer 4 are subjected to tensile force, thereby protecting the insulating layer 2, the shielding layer 3 and the conductor 1.

[0042] When the reinforcing layer 7 is subjected to torsional force, the torsional force is transmitted to the protective layer 4 and the tensile member 601 through the reinforcing layer 7. When the tensile member 601 is subjected to torsional force extending along its spiral direction, the tensile member 601 will shrink. The shrinkage of the tensile member 601 will squeeze and pull the partition 502 and the heat expansion member 602. The tensile member 601 will drive the partition 502 to rotate on the corresponding fixing member 501, thereby offsetting the pulling and squeezing of the tensile member 601 on the partition 502.

[0043] While the tensile member 601 drives the partition 502 to rotate on the fixed member 501, due to the contraction of the tensile member 601, the tensile member 601 will slide on the partition 502, so that the entire tensile member 601 is in a state of tension and torsion. During this process, the tensile member 601 slides on the thermal expansion member 602, and after contraction, it will squeeze the corresponding thermal expansion member 602 through the blocking member 603, so that the thermal expansion member 602 stretches the flame retardant member 504. When the torsion continues, the tensile member 601 will squeeze the sliding member 505 and the corresponding telescopic airbag 506 through the thermal expansion member 602 and the flame retardant member 504, so as to offset part of the torsion force, increase the torsion resistance of the reinforcement layer 7 and the protective layer 4, and prevent the torsion force from being directly transmitted to the shielding layer 3 and the conductor 1 when it is subjected to external torsion force, thereby causing damage to the cable.

[0044] When the reinforcing layer 7 is subjected to a torsional force in the opposite direction of the spiral extension direction of the tensile member 601, the reinforcing layer 7 and the protective layer 4 pull the tensile member 601 outward, and the torsional force causes the tensile member 601 to arch. At the same time, the partition 502 and the heat expansion member 602 pull the tensile member 601 in the opposite direction, and the partition 502 rotates on the fixing member 501, thereby offsetting part of the influence of the torsional force on the tensile member 601.

[0045] When the tensile member 601 is subjected to a torsional force, the heat expansion member 602 exerts a reaction force on the arch of the tensile member 601 through the joint action of the flame retardant 504, the swing member 507 and the sliding member 505. When the tensile member 601 pulls the heat expansion member 602, the flame retardant 504, the swing member 507 and the sliding member 505, the telescopic airbag 506 is squeezed or stretched. In order to maintain the stable air pressure, the telescopic airbag 506 absorbs or discharges part of the inert gas 506. 09, the volume of the telescopic airbag 506 changes, thereby changing the air pressure inside the fire extinguishing chamber 503. The telescopic airbag 506 acts on the sliding member 505, causing the sliding member 505 to apply a reverse pulling force to the tensile member 601 through the heat expansion member 602, the flame retardant member 504 and the swing member 507, thereby delaying the deformation of the tensile member 601, reducing the arching amplitude of the tensile member 601, and greatly reducing the damage to the internal conductor 1 of the cable when the tensile member 601 is twisted.

[0046] The anti-tensile member 601 provided can resist a part of the tensile force by deformation. When the tensile force increases, the anti-tensile member 601 can resist a part of the external tensile force through the blocking member 603 and the heat expansion member 602 with the help of the tensile force of the wavy part of the flame retardant member 504. When the external tensile force increases again, the anti-tensile member 601 exchanges with the inert gas 509 in the adjacent multiple fire extinguishing chambers 503 through the flame retardant member 504 with the help of the telescopic airbag 506, so as to obtain a stronger tensile resistance and achieve a better tensile resistance effect, thereby preventing the insulating layer 2, the shielding layer 3 and the conductor 1 from being directly stretched when the reinforcing layer 7 and the protective layer 4 are subjected to tensile force, thereby protecting the insulating layer 2, the shielding layer 3 and the conductor 1. Through the rotation of the partition 502 and the reverse force of the heat expansion member 602 and the flame retardant member 504 on the anti-tensile member 601, a part of the external torsional force on the reinforcing layer 7 can be offset, thereby preventing the external torsional force from being directly transmitted to the inside 504, the flame retardant 504, the swinging member 507 and the sliding member 505 act on the telescopic airbag 506, thereby causing the air pressure of the telescopic airbag 506 to change, resulting in a change in the volume of the telescopic airbag 506, and further affecting the air pressure stability inside the fire extinguishing chamber 503 and the telescopic airbag 506, so that the telescopic airbag 506 gives a reaction force to the tensile member 601 through the sliding member 505, the swinging member 507, the flame retardant 504 and the thermal expansion member 602, which has a reverse effect on the arching of the tensile member 601, delays and suppresses the arching of the tensile member 601, prevents the torsional force from directly acting on the conductor 1 inside the cable, and increases the anti-twist ability of the cable.

[0047] Embodiment 3 When the internal insulation layer or shielding layer catches fire, the telescopic airbag will be squeezed and contracted, but the degree of contraction may not be able to make multiple flame retardant parts in the same fire extinguishing chamber in close contact, and will definitely be able to make close contact with the shielding layer in the fire extinguishing chamber corresponding to the fire point, resulting in gaps in the formed enclosed space. Therefore, the fire extinguishing ability is subject to certain limitations, resulting in poor fire extinguishing effect.

[0048] Based on the above-mentioned embodiment 1 and embodiment 2, refer to the accompanying drawings of the specification. Figures 1 to 7It can be obtained that the adopted technical scheme includes a conductor 1, an insulating layer 2 is wrapped on the outside of the conductor 1, a shielding layer 3 is wrapped on the outside of the insulating layer 2, a protective layer 4 is arranged on the outside of the shielding layer 3, and also includes a flame retardant component 5 and a tensile component 6, the flame retardant component 5 includes a plurality of fixing parts 501 fixedly arranged on the shielding layer 3, each fixing part 501 is rotatably provided with a partition 502, two adjacent partitions 502 and the fixing part 501 and the protective layer 4 and the shielding layer 3 together form a fire extinguishing chamber 503 for extinguishing the fire point, the tensile component 6 includes a plurality of tensile parts 601 fixedly arranged on the inner wall of the protective layer 4, each tensile part 601 is slidably connected to the partition 502, and is used to increase the tensile capacity of the protective layer 4, and a plurality of flame retardant parts 504 capable of covering the shielding layer 3 are arranged in each fire extinguishing chamber 503, two sliding parts 505 are slidably provided on each fixing part 501, and the same fixing part 50 1, telescopic airbags 506 are fixedly provided at the opposite ends of the two sliding members 505, and one end of each telescopic airbag 506 away from the corresponding sliding member 505 is fixedly connected to the corresponding partition 502, and swing members 507 are hingedly connected to the two sides of the flame retardant 504, and one end of the swing member 507 away from the corresponding flame retardant 504 is hingedly connected to the corresponding sliding member 505, and the telescopic airbag 506 is connected to the adjacent fire extinguishing chamber 503 through a connecting pipe 508, and the interiors of the fire extinguishing chamber 503 and the telescopic airbag 506 are filled with inert gas 509, and the tensile component 6 also includes a heat expansion member 602 fixedly provided on both sides of each flame retardant 504, each tensile member 601 is slidably connected to the corresponding heat expansion member 602, and a plurality of blocking members 603 corresponding to the heat expansion member 602 are fixedly provided on the tensile member 601, and a reinforcing layer 7 is fixedly provided on the outer side of the protective layer 4, and the shape of the tensile member 601 is spiral.

[0049] When a fire occurs in the fire extinguishing chamber 503, the temperature inside the fire extinguishing chamber 503 rises rapidly, squeezing the telescopic airbag 506 in the fire extinguishing chamber 503 to shrink, so that the telescopic airbag 506 drives the swinging member 507 to move through the sliding member 505, and the swinging member 507 drives the flame retardant 504 to move toward the axis of the conductor 1. At the same time, the thermal expansion member 602 absorbs the heat generated by the combustion and expands, so that the thermal expansion member 602 pushes the flame retardant 504 to move toward the axis of the conductor 1, and at the same time plays a certain guiding role to prevent the swinging member 507 from stretching the flame retardant 504 to deform. The position where the thermal expansion member 602 is fixedly connected to the flame retardant 504 can be set to the same arc shape as the flame retardant 504, which is not shown in the figure. Therefore, when the thermal expansion member 602 pushes the flame retardant 504 to contact the shielding layer 3, the tightness of the contact between the flame retardant 504 and the shielding layer 3 and between multiple flame retardants 504 is guaranteed, and the fire point is isolated to avoid the spread of fire.

[0050] By setting the heat expansion member 602, when a fire occurs inside the fire extinguishing chamber 503, the heat expansion member 602 can absorb heat and expand. When the swing member 507 pulls the flame retardant member 504 to move toward the axis of the conductor 1, the heat expansion member 602 pushes the flame retardant member 504 to move in the same direction. After the flame retardant member 504 contacts the shielding layer 3, the heat expansion member 602 squeezes the flame retardant member 504 to ensure that the flame retardant member 504 is in close contact with the shielding layer 3, and multiple flame retardants 504 are in close contact with each other, completely sealing the fire point, achieving a better fire extinguishing effect, and preventing the fire from spreading to other locations, causing the entire cable to catch fire and triggering the car to burn, causing greater property losses and casualties.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A DC flame-retardant tensile cable for a charging pile, comprising a conductor (1), the conductor (1) being wrapped with an insulating layer (2), the insulating layer (2) being wrapped with a shielding layer (3), the shielding layer (3) being provided with a protective layer (4) on the outside, characterized in that: Also includes: A flame retardant assembly (5), the flame retardant assembly (5) comprising a plurality of fixing members (501) fixedly arranged on the shielding layer (3), each of the fixing members (501) being rotatably provided with a partition member (502), and two adjacent partition members (502) and the fixing members (501) and the protective layer (4) and the shielding layer (3) together forming a fire extinguishing chamber (503) for extinguishing a fire at a fire point; A tensile component (6), the tensile component (6) comprising a plurality of tensile members (601) fixedly arranged on the inner wall of the protective layer (4), each of the tensile members (601) being slidably connected to the partition (502) to increase the tensile resistance of the protective layer (4).

2. A DC flame-retardant tensile cable for a charging pile according to claim 1, characterized in that: A plurality of flame retardant parts (504) capable of covering the shielding layer (3) are arranged in each fire extinguishing chamber (503).

3. A DC flame-retardant tensile cable for a charging pile according to claim 2, characterized in that: Two sliding members (505) are slidably disposed on each of the fixing members (501), and telescopic air bags (506) are respectively fixedly disposed on opposite ends of the two sliding members (505) on the same fixing member (501).

4. A DC flame-retardant tensile cable for a charging pile according to claim 3, characterized in that: One end of each telescopic airbag (506) away from the corresponding sliding member (505) is fixedly connected to the corresponding partition member (502).

5. A DC flame-retardant tensile cable for a charging pile according to claim 4, characterized in that: Swinging pieces (507) are hingedly connected to both sides of the flame retardant piece (504), and one end of the swinging piece (507) away from the corresponding flame retardant piece (504) is hingedly connected to the corresponding sliding piece (505).

6. A DC flame-retardant tensile cable for a charging pile according to claim 5, characterized in that: The telescopic airbag (506) is connected to the adjacent fire extinguishing chamber (503) via a connecting pipe (508), and the interiors of the fire extinguishing chamber (503) and the telescopic airbag (506) are both filled with inert gas (509).

7. A DC flame-retardant tensile cable for a charging pile according to claim 6, characterized in that: The tensile component (6) further comprises heat expansion components (602) fixedly arranged on both sides of each flame retardant component (504), and each tensile component (601) is slidably connected to a corresponding heat expansion component (602).

8. A DC flame-retardant tensile cable for a charging pile according to claim 7, characterized in that: A plurality of blocking members (603) corresponding to the thermal expansion members (602) are fixedly arranged on the tensile member (601).

9. A DC flame-retardant tensile cable for a charging pile according to claim 8, characterized in that: A reinforcement layer (7) is fixedly provided on the outer side of the protective layer (4).

10. A DC flame-retardant tensile cable for a charging pile according to claim 9, characterized in that: The tensile member (601) is in a spiral shape.

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