A DC flame-retardant and tensile-resistant cable for charging piles

Abstract

The present invention discloses a DC flame-retardant and tensile-resistant cable for charging piles, which relates to the technical field of cables and includes a conductor. A layer of insulating layer is wrapped outside the conductor, and a layer of shielding layer is wrapped outside the insulating layer. A protective layer is arranged outside the shielding layer. The cable also includes a flame-retardant component and a tensile-resistant component. The flame-retardant component includes a plurality of fixing pieces, and a partition piece is rotatably arranged on the fixing piece. An extinguishing chamber is formed between two adjacent partition pieces, the fixing piece, the protective layer and the shielding layer. The tensile-resistant component includes a plurality of tensile pieces. Through the setting of the flame-retardant pieces, when a fire breaks out in the extinguishing chamber, the ignition point can be covered to form a sealed space, thus achieving a good flame-retardant effect. Through the cooperation of the tensile pieces with the flame-retardant pieces, the expansion air bags and the inert gas in the extinguishing chamber, the tensile resistance of the tensile pieces can be enhanced, thereby effectively solving the problems of poor flame retardancy and tensile resistance of the existing charging pile cables.

Description

Technical Field

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

[0002] With the rapid development of the new energy vehicle industry, new energy charging piles have become popular. However, when using a new energy charging pile to charge a new energy vehicle, due to the frequent use of the charging cable, the inside of the cable is always in a high-temperature state, which is extremely easy to catch fire from the inside. After the cable catches fire, it is extremely easy to cause the new energy vehicle to catch fire, thus causing safety problems, resulting in people's property losses, and even endangering people's lives.

[0003] When using a charging pile, when pulling out 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 a little. Therefore, the charging cable is often stretched. When the charging cable is stretched, it is easy to stretch the conductive core inside the cable and the protective sheath layer wrapped on the outside, thus easily causing damage to the conductive core. And when the new energy vehicle is parked in the corresponding parking space where the charging pile is damaged, for the sake of convenience, the charging cable on the adjacent charging pile is usually directly pulled to this parking space to charge the new energy vehicle. During this process, the charging cable will be continuously and strongly stretched, and this usage method will cause damage to the inside of the cable. Summary of the Invention

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

[0005] To achieve the above purpose, the present invention provides the following technical solution: A DC flame-retardant and tensile-resistant cable for charging piles, including a conductor, an insulating layer is wrapped outside the conductor, a shielding layer is wrapped outside the insulating layer, a protective layer is arranged outside the shielding layer, and further includes:

[0006] A flame-retardant component, the flame-retardant component includes a plurality of fixing members fixedly arranged on the shielding layer, a partitioning member is rotatably arranged on each fixing member, and between two adjacent partitioning members and the fixing member, the protective layer and the shielding layer together form a fire extinguishing chamber for extinguishing the ignition point;

[0007] A tensile-resistant component, the tensile-resistant component includes a plurality of tensile members fixedly arranged on the inner wall of the protective layer, and each tensile member is slidably connected to the partitioning member for increasing the tensile resistance of the protective layer.

[0008] Preferably, a plurality of flame-retardant members capable of covering the shielding layer are arranged in each fire extinguishing chamber.

[0009] Preferably, two sliding members are slidably provided on each of the fixing members, and telescopic air bags are fixedly provided at the opposite ends of the two sliding members on the same fixing member.

[0010] Preferably, one end of each telescopic air bag away from the corresponding sliding member is fixedly connected to the corresponding partition member.

[0011] 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.

[0012] Preferably, the telescopic air bag is communicated with the adjacent fire extinguishing chamber through a communicating pipe, and inert gases are filled in both the fire extinguishing chamber and the interior of the telescopic air bag.

[0013] Preferably, the tensile component further includes thermal expansion members fixedly provided on both sides of each flame retardant member, and each tensile member is slidably connected to the corresponding thermal expansion member.

[0014] Preferably, a plurality of blocking members corresponding to the thermal expansion members are fixedly provided on the tensile member.

[0015] Preferably, a reinforcing layer is fixedly provided on the outer side of the protective layer.

[0016] Preferably, the shape of the tensile member is spiral.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. Through the provided flame retardant member capable of covering the ignition point, when a fire occurs, the telescopic air bag corresponding to the fire extinguishing chamber on fire discharges gas, so that the sliding member pulls the flame retardant member towards the axis of the conductor through the swing member. While making the plurality of flame retardant members in close contact with each other, the flame retardant member is in close contact with the shielding layer, so that a sealed space is formed between the plurality of flame retardant members corresponding to the ignition point, achieving the effects of extinguishing fire and preventing the spread of fire, and the inert gas can play a certain role in extinguishing fire.

[0019] 2. Through the provided tensile member, it can resist a part of the tensile force by deformation. When the tensile force increases, the tensile member can resist a part of the external tensile force through the blocking member and the thermal expansion member by means of the tensile capacity at the corrugated part of the flame retardant member.

[0020] 3. When the external tensile force increases again, the tensile member obtains stronger tensile capacity through the flame retardant member by means of the exchange of inert gas between the telescopic air bag and the adjacent fire extinguishing chamber, achieving a better tensile effect, preventing the insulation layer, shielding layer and conductor from being directly pulled when the reinforcing layer and the protective layer are subjected to tensile force, thereby protecting the insulation layer, shielding layer and conductor.

[0021] 4. By means of the rotation of the partition member and the reverse acting forces of the thermal expansion member, the flame retardant member, etc. on the tensile member, a part of the torsional force from the outside can be offset, preventing the direct transmission of the external torsional force to the internal cable conductor, thereby achieving the effect of anti-torsion.

[0022] 5. When the strengthening layer is subjected to a torsional force in the direction opposite to the spiral extension direction of the tensile member, a part of the torsional force can be offset through the reverse stretching and rotation of the partition member. Moreover, the torsional force of the tensile member will act on the telescopic airbag through the thermal expansion member, the flame retardant member, the swinging member, and the sliding member, thereby causing a change in the air pressure of the telescopic airbag, resulting in a change in the volume of the telescopic airbag, and further affecting the air pressure stability inside the fire extinguishing chamber and the telescopic airbag. Thus, the telescopic airbag gives a reaction force to the tensile member through the sliding member, the swinging member, the flame retardant member, and the thermal expansion member, playing a role in pulling the arching of the tensile member in the reverse direction, delaying and inhibiting the arching of the tensile member, preventing the torsional force from directly acting on the conductor inside the cable, and increasing the anti-torsion ability of the cable.

[0023] 6. Through the provided thermal expansion member, when a fire breaks out inside the fire extinguishing chamber, the thermal expansion member can absorb heat and expand. When the swinging member pulls the flame retardant member towards the conductor axis, the thermal expansion member can push the flame retardant member to move in the same direction. After the flame retardant member contacts the shielding layer, the thermal expansion member squeezes the flame retardant member, ensuring that the flame retardant member is in close contact with the shielding layer and that multiple flame retardant members are in close contact with each other, completely sealing the ignition point, playing a better fire extinguishing role, preventing the fire from spreading to other positions, and avoiding the situation where the entire cable catches fire and causes the combustion of new energy vehicles, resulting in greater property losses and casualties. Description of the Drawings

[0024] Figure 1 It is the full-section front view plan of the present invention.

[0025] Figure 2 It is the full-section left view plan of the present invention after removing the strengthening layer and the protective layer.

[0026] Figure 3 It is the present invention Figure 2 The enlarged view at A in the present invention.

[0027] Figure 4 It is the full-section left view plan of the fire extinguishing chamber in the present invention.

[0028] Figure 5 It is the state diagram of multiple flame retardant members extinguishing fire in the present invention.

[0029] Figure 6 It is the schematic diagram of the connection relationship among the tensile member, the partition member, and the blocking member in the present invention.

[0030] Figure 7 It is the part schematic diagram of the tensile member in the present invention.

[0031] The reference numerals are: 1, conductor; 2, insulating layer; 3, shielding layer; 4, protective layer;

[0032] 5, flame retardant component; 501, fixing member; 502, separating member; 503, fire extinguishing chamber; 504, flame retardant member; 505, sliding member; 506, telescopic airbag; 507, swinging member; 508, connecting pipe; 509, inert gas;

[0033] 6, tensile component; 601, tensile member; 602, thermal expansion member; 603, blocking member;

[0034] 7, reinforcing layer. Detailed implementation manners

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment 1

[0037] With the rapid development of the new energy vehicle industry in our country, new energy charging piles have become popular. However, when using a new energy charging pile to charge a new energy vehicle, due to the frequent use of the charging cable, the inside of the cable is always in a high temperature state, which is extremely easy to catch fire from the inside. After the cable catches fire, it is very easy to cause the new energy vehicle to catch fire, thus causing safety problems, resulting in people's property losses, and even endangering people's lives.

[0038] To solve the above technical problems, please refer to the accompanying drawings of the specification Figure 1 and Figure 7As shown in the figure, a DC flame-retardant and tensile cable for a charging pile according to an embodiment of the present invention includes a conductor 1, an insulating layer 2 is wrapped outside the conductor 1, a shielding layer 3 is wrapped outside the insulating layer 2, a protective layer 4 is arranged outside the shielding layer 3, and a flame-retardant component 5 is further included. The flame-retardant component 5 includes a plurality of fixing members 501 fixedly arranged on the shielding layer 3. A partitioning member 502 is rotatably arranged on each fixing member 501. An extinguishing chamber 503 is jointly formed between two adjacent partitioning members 502, the fixing member 501, the protective layer 4 and the shielding layer 3 for extinguishing the ignition point. A plurality of flame-retardant members 504 capable of covering the shielding layer 3 are arranged in each extinguishing chamber 503. Two sliding members 505 are slidably arranged on each fixing member 501. Telescopic air bags 506 are fixedly arranged at the opposite ends of the two sliding members 505 on the same fixing member 501. One end of each telescopic air bag 506 away from the corresponding sliding member 505 is fixedly connected to the corresponding partitioning member 502. Swing members 507 are respectively hinged on both sides of the flame-retardant member 504. One end of the swing member 507 away from the corresponding flame-retardant member 504 is hinged to the corresponding sliding member 505. The telescopic air bag 506 is communicated with the adjacent extinguishing chamber 503 through a communication pipe 508. Inert gas 509 is filled in both the extinguishing chamber 503 and the telescopic air bag 506. A reinforcing layer 7 is fixedly arranged outside the protective layer 4.

[0039] During use, when a fire breaks out inside the cable, the temperature in the extinguishing chamber 503 rises sharply. The structure of the extinguishing chamber 503 can be understood with reference to the Figure 4 drawings in the specification, so that the inert gas 509 in the extinguishing chamber 503 expands rapidly, causing the inert gas 509 to compress the telescopic air bags 506 in the extinguishing chamber 503, causing the two telescopic air bags 506 in the extinguishing chamber 503 to contract, and causing the inert gas 509 in the telescopic air bags 506 to be discharged into the adjacent extinguishing chamber 503 through the communication pipe 508 for pressure relief, so that the telescopic air bags 506 drive the sliding members 505 to move in the direction of their corresponding partitioning members 502. The sliding members 505 and the telescopic air bags 506 are both annular and are not shown in detail in the figure.

[0040] The sliding member 505 drives the corresponding swing member 507 to move in the direction of the partitioning member 502 on the side close to the shielding layer 3. Both hinge joints of each swing member 507 are hinged to the corresponding flame-retardant member 504 and the sliding member 505 through rotating shafts, causing the side of the swing member 507 hinged to the flame-retardant member 504 to move downward, the angle between the swing member 507 and the axis of the conductor 1 to become smaller, and the side of the swing member 507 hinged to the flame-retardant member 504 to drive the flame-retardant member 504 to move in the direction close to the conductor 1. The two swing members 507 corresponding to the same flame-retardant member 504 are in a V shape.

[0041] When the gas inside the telescopic airbag 506 decreases to a certain extent and the angle between the swing member 507 and the axis of the conductor 1 decreases to a certain extent, multiple flame retardant members 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 ignition point. Moreover, the multiple flame retardant members 504 are in close contact with each other to form a sealed space, playing a role in fire extinguishing and isolation, preventing the spread of fire, and avoiding the occurrence of a fire in a new energy vehicle caused by a cable fire, resulting in a safety accident.

[0042] By providing the flame retardant members 504 that can cover the ignition point, when a fire occurs, the telescopic airbag 506 can discharge the gas, so that the sliding member 505 can pull the flame retardant members 504 in the direction of the axis of the conductor 1 through the swing member 507. While the multiple flame retardant members 504 are in close contact with each other, the flame retardant members 504 are in close contact with the shielding layer 3, so that a sealed space is formed between the multiple flame retardant members 504 corresponding to the ignition point, achieving the effects of fire extinguishing and preventing the spread of fire.

[0043] Embodiment 2

[0044] When using a charging pile, when pulling out the charging head of the charging cable and then inserting it into the charging port of a new energy vehicle, it is usually necessary to pull the charging cable. Therefore, the charging cable is often stretched. When the charging cable is stretched, it is easy to stretch the conductive core inside the cable and the protective sheath layer wrapped on the outside, which is likely to cause damage to the conductive core. And when the new energy vehicle is parked in the corresponding parking space where the charging pile is damaged, for the sake of convenience, the charging cable on the adjacent charging pile is usually directly pulled to this parking space to charge the new energy vehicle. During this process, the charging cable will be continuously and strongly stretched. This way of using will cause damage to the inside of the cable, and during 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.

[0045] On the basis of the above-mentioned Embodiment 1, to solve the above technical problems, please refer to Figures 1 to 7 As shown, the technical solution adopted includes the conductor 1, and also includes a tensile strength component 6. The tensile strength component 6 includes multiple tensile members 601 fixedly arranged on the inner wall of the protective layer 4. Each tensile member 601 is slidably connected to the partition member 502 for increasing the tensile strength of the protective layer 4. The tensile strength component 6 also includes thermal expansion members 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. Multiple blocking members 603 corresponding to the thermal expansion members 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.

[0046] When the reinforcement layer 7 is stretched, the reinforcement 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, and thus the tensile member 601 slides on the partition member 502 and the thermal expansion member 602, preventing the internal conductor 1 from being stretched when the reinforcement layer 7 and the protective layer 4 are externally stretched, and causing damage to the conductor 1.

[0047] When the tensile force applied to the reinforcement layer 7 is relatively large, the deformation degree of the tensile member 601 pulled by the protective layer 4 is greater. 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 thermal expansion member 602, causing the thermal expansion member 602 to pull the corresponding flame retardant member 504 to deform. Moreover, the middle part of the flame retardant member 504 is arranged in a wavy shape, which can resist part of the tensile force and weaken the deformation degree of the tensile member 601, thereby increasing the tensile resistance of the tensile member 601.

[0048] When the tensile force applied to the reinforcement layer 7 further increases, the reinforcement layer 7 and the protective layer 4 drive the tensile member 601 to deform to a greater extent, thereby overcoming the resistance provided by multiple flame retardant members 504. At this time, the flame retardant member 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 thermal expansion member 602 and the flame retardant member 504, causing the sliding member 505 to squeeze the telescopic airbag 506 fixed thereto, 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 communication pipe 508, delaying the deformation of the tensile member 601.

[0049] Since the air pressures on both sides are equal, the telescopic airbag 506 in the adjacent fire extinguishing chamber 503 can be compressed and its volume becomes smaller, so that the inert gas 509 in the telescopic airbag 506 in the adjacent fire extinguishing chamber 503 is discharged into the connected fire extinguishing chamber 503 and the fire extinguishing chamber 503 corresponding to the squeezed telescopic airbag 506, thus causing a chain reaction, enabling the inert gas 509 in multiple fire extinguishing chambers 503 and the telescopic airbag 506 to flow, achieving a better effect of resisting the deformation of the tensile member 601, enhancing the tensile resistance of the tensile member 601, and preventing the insulation layer 2, the shielding layer 3 and the conductor 1 from being directly stretched when the reinforcement layer 7 and the protective layer 4 are subjected to tensile force, thereby protecting the insulation layer 2, the shielding layer 3 and the conductor 1.

[0050] When the strengthening layer 7 is subjected to a torsional force, the torsional force is transmitted through the strengthening layer 7 to the protective layer 4 and the tensile member 601. When the tensile member 601 is subjected to a torsional force extending along its spiral direction, the tensile member 601 will contract. The contraction of the tensile member 601 will squeeze and pull the partition member 502 and the thermal expansion member 602. The tensile member 601 will drive the partition member 502 to rotate on the corresponding fixing member 501, so as to offset the pulling force and extrusion force of the tensile member 601 on the partition member 502.

[0051] While the tensile member 601 drives the partition member 502 to rotate on the fixing member 501, due to the contraction of the tensile member 601, the tensile member 601 will slide on the partition member 502, making the entire tensile member 601 in a tensile and torsional state. During this process, the tensile member 601 slides on the thermal expansion member 602. 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 continuously twisted, the tensile member 601 will squeeze the sliding member 505 and the corresponding expansion airbag 506 through the thermal expansion member 602 and the flame retardant member 504, so as to offset part of the torsional force, increase the anti-torsion ability of the strengthening layer 7 and the protective layer 4, and prevent the torsional force from being directly transmitted to the shielding layer 3 and the conductor 1 when the external torsional force is applied, resulting in damage to the cable.

[0052] When the strengthening layer 7 is subjected to a torsional force opposite to the spiral extension direction of the tensile member 601, the strengthening layer 7 and the protective layer 4 will pull the tensile member 601 outward. The torsional force will drive the tensile member 601 to arch. At the same time, due to the partition member 502 and the thermal expansion member 602 pulling the tensile member 601 in the opposite direction, and the partition member 502 can offset part of the influence of the torsional force on the tensile member 601 by rotating on the fixing member 501.

[0053] When the tensile member 601 is subjected to a torsional force, the thermal expansion member 602 gives a reaction force to the arching of the tensile member 601 through the combined action of the flame retardant member 504, the swing member 507 and the sliding member 505. When the tensile member 601 pulls the thermal expansion member 602, the flame retardant member 504, the swing member 507 and the sliding member 505, the expansion airbag 506 will be squeezed or stretched. In order to maintain the air pressure stability inside, the expansion airbag 506 will absorb or discharge part of the inert gas 509, causing the volume of the expansion airbag 506 to change, thereby causing the air pressure inside the fire extinguishing chamber 503 to change. Thus, through the action of the expansion airbag 506 on the sliding member 505, the sliding member 505 applies a reverse pulling force to the tensile member 601 through the thermal expansion member 602, the flame retardant member 504 and the swing member 507, achieving the effect of 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.

[0054] Through the provided tensile member 601, it can resist a part of the tensile force through deformation. When the tensile force increases, the tensile member 601 can resist a part of the external tensile force by means of the blocking member 603 and the thermal expansion member 602 with the tensile force at the wavy part of the flame retardant member 504. When the external tensile force increases again, the tensile member 601 obtains stronger tensile capacity through the exchange of the flame retardant member 504 with the inert gas 509 in the adjacent multiple fire extinguishing chambers 503 by means of the expansion and contraction airbag 506, achieving a better tensile effect, and preventing the insulation 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 insulation layer 2, the shielding layer 3, and the conductor 1. Through the rotation of the partition member 502 and the reaction forces of the thermal expansion member 602, the flame retardant member 504, etc. on the tensile member 601, a part of the external torsional force on the reinforcing layer 7 can be offset, preventing the external torsional force from being directly transmitted to the internal cable conductor 1, thereby achieving the effect of anti-torsion. When the reinforcing layer 7 is subjected to a torsional force opposite to the spiral extension direction of the tensile member 601, a part of the torsional force can be offset through the reverse stretching and rotation of the partition member 502, and the torsional force of the tensile member 601 will act on the expansion and contraction airbag 506 through the thermal expansion member 602, the flame retardant member 504, the swinging member 507, and the sliding member 505, thereby causing a change in the air pressure of the expansion and contraction airbag 506, resulting in a change in the volume of the expansion and contraction airbag 506, further affecting the air pressure stability inside the fire extinguishing chamber 503 and the expansion and contraction airbag 506, so that the expansion and contraction airbag 506 gives a reaction force to the tensile member 601 through the sliding member 505, the swinging member 507, the flame retardant member 504, and the thermal expansion member 602, achieving the effect of acting in the reverse direction on the arching of the tensile member 601, delaying and inhibiting the arching of the tensile member 601, preventing the torsional force from directly acting on the conductor 1 inside the cable, and increasing the anti-torsion ability of the cable.

[0055] Embodiment III

[0056] When the internal insulation layer or shielding layer catches fire, although the expansion and contraction airbag will be squeezed and contracted, the degree of contraction may not necessarily make the multiple flame retardant members in the same fire extinguishing chamber in close contact, and may not necessarily be in close contact with the shielding layer in the fire extinguishing chamber corresponding to the ignition point, resulting in possible gaps in the formed sealed space. Therefore, the fire extinguishing ability is limited to a certain extent, leading to poor fire extinguishing effect.

[0057] On the basis of the above Embodiment I and Embodiment II, referring to the Figures 1 to 7It can be seen that the adopted technical solution includes a conductor 1, an insulating layer 2 is wrapped outside the conductor 1, a shielding layer 3 is wrapped outside the insulating layer 2, a protective layer 4 is arranged outside the shielding layer 3, and a flame-retardant component 5 and a tensile component 6 are also included. The flame-retardant component 5 includes a plurality of fixing members 501 fixedly arranged on the shielding layer 3. A partition member 502 is rotatably arranged on each fixing member 501. An adjacent two partition members 502, the fixing member 501, the protective layer 4 and the shielding layer 3 together form a fire extinguishing chamber 503 for extinguishing the ignition point. 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 member 502 for increasing the tensile capacity of the protective layer 4. A plurality of flame-retardant members 504 capable of covering the shielding layer 3 are arranged in each fire extinguishing chamber 503. Two sliding members 505 are slidably arranged on each fixing member 501. The opposite ends of the two sliding members 505 on the same fixing member 501 are respectively fixedly provided with telescopic air bags 506. One end of each telescopic air bag 506 away from the corresponding sliding member 505 is fixedly connected to the corresponding partition member 502. Swing members 507 are respectively hinged to both sides of the flame-retardant member 504. One end of the swing member 507 away from the corresponding flame-retardant member 504 is hinged to the corresponding sliding member 505. The telescopic air bag 506 is communicated with the adjacent fire extinguishing chamber 503 through a communication pipe 508. Inert gas 509 is filled in both the fire extinguishing chamber 503 and the telescopic air bag 506. The tensile component 6 further includes thermal expansion members 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 members 602 are fixedly arranged on the tensile member 601. A reinforcing layer 7 is fixedly arranged outside the protective layer 4. The shape of the tensile member 601 is spiral.

[0058] When a fire breaks out in the fire extinguishing chamber 503, due to the rapid increase in the internal temperature, the telescopic air bag 506 in the fire extinguishing chamber 503 is squeezed to contract. Thus, the telescopic air bag 506 drives the swing member 507 to move through the sliding member 505. The swing member 507 drives the flame-retardant member 504 to move towards the axis of the conductor 1. At the same time, the thermal expansion member 602 absorbs the heat generated by combustion and expands, so that the thermal expansion member 602 pushes the flame-retardant member 504 to move towards the axis of the conductor 1, and at the same time plays a certain guiding role to prevent the swing member 507 from stretching the flame-retardant member 504 and deforming. The position where the thermal expansion member 602 is fixedly connected to the flame-retardant member 504 can be set to be arc-shaped like the flame-retardant member 504, which is not shown in the figure. Thus, when the thermal expansion member 602 pushes the flame-retardant member 504 to contact the shielding layer 3, the tightness of the contact between the flame-retardant member 504 and the shielding layer 3 and between the plurality of flame-retardant members 504 is ensured, the ignition point is isolated, and the spread of the fire is avoided.

[0059] Through the provided thermal expansion member 602, when a fire breaks out inside the fire extinguishing chamber 503, the thermal expansion member 602 can absorb heat and expand. When the swinging member 507 pulls the flame retardant member 504 towards the axis of the conductor 1, the thermal expansion member 602 can push the flame retardant member 504 to move in the same direction. After the flame retardant member 504 contacts the shielding layer 3, the thermal 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 that multiple flame retardant members 504 are in close contact with each other, completely sealing the ignition point, playing a better fire extinguishing role, preventing the fire from spreading to other positions, and avoiding the situation where the entire cable catches fire and causes the vehicle to burn, resulting in greater property losses and casualties.

[0060] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within 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); A plurality of flame retardant parts (504) capable of covering the shielding layer (3) are arranged in each of the fire extinguishing chambers (503); 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); A plurality of blocking members (603) corresponding to the thermal expansion members (602) are fixedly arranged on the tensile member (601); The tensile member (601) is in a spiral shape.

2. A DC flame-retardant tensile cable for a charging pile according to claim 1, 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).

3. A DC flame-retardant tensile cable for a charging pile according to claim 2, 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).

4. A DC flame-retardant tensile cable for a charging pile according to claim 3, 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).

5. A DC flame-retardant tensile cable for a charging pile according to claim 4, 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).

6. A DC flame-retardant tensile cable for a charging pile according to claim 5, characterized in that: A reinforcement layer (7) is fixedly provided on the outer side of the protective layer (4).

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