CN120376220B

CN120376220B - A pressure-resistant and explosion-proof cable

Info

Publication number: CN120376220B
Application number: CN202510618999.4A
Authority: CN
Inventors: 谢春雨
Original assignee: Beijing Shunyue Technology Co ltd
Current assignee: Hebei Xinsen Cable Co ltd
Priority date: 2025-05-14
Filing date: 2025-05-14
Publication date: 2025-09-26
Anticipated expiration: 2045-05-14
Also published as: CN120376220A

Abstract

The present invention discloses a pressure-resistant explosion-proof cable, comprising a conductor, an inner sheath, an insulating layer, a shielding layer, a filling layer, a tape layer, an armor layer, and an outer sheath. A plurality of buffer layers are sleeved between the tape layer and the armor layer, and the plurality of buffer layers are equidistantly distributed along the length direction of the cable. Through the arrangement of fire extinguishing agent and flame retardant cotton, when a fire occurs, when the buffer layer catches fire, the flame will be blocked by the flame retardant cotton in the buffer cavity, causing the flame to burn the elastic member in an extruded state. When the elastic member in an extruded state burns, the fire extinguishing agent inside it will be quickly ejected through the pressure difference between the inside and the outside to extinguish the flame, thereby preventing high temperature from being transmitted to the conductor and the insulation layer, extending the working time, and preventing the flame from continuing to burn and causing damage to the conductor. When the cable is twisted as a whole, resistance is formed by the elastic force of the elastic member and the guide block, preventing the cable from damaging the conductor due to twisting, thereby improving the safety and service life of the cable.

Description

Compression-resistant explosion-proof cable

Technical Field

The invention relates to the technical field of cables, in particular to a compression-resistant explosion-proof cable.

Background

With the acceleration of industrialization and urban processes, in high-risk environments such as petrochemical industry, mining, electric power and rail transit, cables are required to not only meet basic conductivity, but also have the capability of maintaining functional integrity under extreme conditions (such as high temperature, flame, explosion impact and the like). The compression-resistant explosion-proof cable is a special cable specially designed for extreme environments, and has the core function of ensuring the safety of power transmission in high-voltage, impact or flammable and explosive scenes.

The invention discloses a Chinese patent with the application number of CN202510163321.1, which relates to the technical field of power cables and comprises a central conductor, wherein the outer side of the central conductor is tightly covered with an inner conductor insulator, the outer side of the inner conductor insulator is tightly covered with an insulating conductor shield, a plurality of insulating conductor shields are jointly covered with a steel tape armor, the outer side of the steel tape armor is tightly covered with a PVC protective sleeve, the outer side of the PVC protective sleeve is provided with an outer telescopic expansion protection mechanism, and the flame-retardant metal thin net is driven to expand outwards through the characteristic of thermal expansion of a flame-retardant expansion adhesive tape.

Although the invention can improve the whole protection capability of the cable, when the cable is subjected to external impact force in the use process, the insulating layer of the cable is damaged, so that the conductor is deformed or broken, and when the cable is in operation, if the heat generated by the conductor cannot be timely conducted to the outer side of the cable, the inner side of the cable is higher in temperature, so that the risk of fire occurs, and meanwhile, when the fire occurs, the cable is burnt, so that the inner structure of the cable is damaged, the conductor is exposed, short circuit is caused, and even the risk of explosion occurs.

Accordingly, in order to solve the above-mentioned problems, it is necessary to provide a pressure-resistant explosion-proof cable.

Disclosure of Invention

The invention aims to provide a compression-resistant explosion-proof cable, which aims to solve the problems that when the cable is subjected to external impact force in the use process, an insulating layer of the cable is damaged, a conductor is deformed or broken, and when the cable runs, if heat generated by the conductor cannot be timely conducted to the outer side of the cable, the inner side temperature of the cable is high, so that the risk of fire disaster occurs, and meanwhile, when the fire disaster occurs, the cable burns, the inner structure of the cable is damaged, the conductor is exposed, short circuit is caused, and even the risk of explosion occurs.

In order to achieve the aim, the invention provides the technical scheme that the compression-resistant explosion-proof cable comprises a conductor, an inner protective layer, an insulating layer, a shielding layer, a filling layer, a belting layer, an armor layer and an outer sheath, wherein a plurality of groups of buffer layers are sleeved between the belting layer and the armor layer, and the buffer layers are distributed along the length direction of the cable at equal intervals;

The inside buffering chamber of having seted up of buffer layer, the buffering intracavity is close to the inner wall fixedly connected with multiunit along circumference equidistance distributed's guide component in tape layer one side, every guide component of group all includes two guide blocks that are the symmetry setting, the guide block is elastic material.

Preferably, each group of guide blocks is internally and hermetically connected with an elastic piece in a sliding manner, two expansion chambers are formed between the elastic piece and a plurality of guide blocks, the elastic piece is internally provided with an elastic chamber, the elastic piece is made of a heat-conducting elastic material, each guide block is attached to the outer wall of the elastic piece, and a gap is reserved between each guide block.

Preferably, each expansion chamber is filled with a thermal expansion material, which may be expanded graphite, which expands rapidly with a thermal volume, and the expansion chambers are tightly filled.

Preferably, the elastic chamber is filled with a fire extinguishing agent, and the fire extinguishing agent can absorb heat and cool down, dilute oxygen and isolate combustible substances.

Preferably, fire-retardant cotton is filled between the buffer cavity and each group of guide blocks, and the fire-retardant cotton can delay the spread of fire and has a heat preservation effect.

Preferably, when the conductor continuously runs and generates heat, the thermal expansion material in the expansion cavity absorbs the heat emitted by the conductor and expands, the thermal expansion material expands and presses the elastic piece to move, the elastic piece moves towards the inner wall of the buffer cavity along the guide block, and the elastic piece is attached to the inner wall of the buffer cavity, so that a heat transfer channel is formed between the elastic piece and the buffer layer.

Preferably, the elastic member presses the guide block in the moving process, so that the end of the guide block tilts along with the movement of the buffer cavity.

Preferably, the inner sheath and the outer sheath are made of polyvinyl chloride flame-retardant wear-resistant materials.

Preferably, the insulating layer is made of crosslinked polyethylene and is made of flame-retardant and wear-resistant materials.

Preferably, the filling layer is inorganic flame-retardant fiber, and has good high-temperature resistance and flame-retardant effect.

The invention has the technical effects and advantages that:

1. Through the arrangement of the elastic piece and the guide block, when the conductor continuously runs and generates heat, heat can be diffused around, the expansion materials in the expansion cavity can absorb the heat to expand, the expansion materials on two sides can move to the middle to extrude the elastic piece, so that the elastic piece protrudes to the inner wall of the buffer cavity along a gap between the guide blocks, the elastic piece is attached to the inner wall of the buffer cavity, the guide block can be extruded in the moving process of the elastic piece, the end part of the guide block is tilted along with the movement of the buffer cavity, then the heat generated by the conductor can be transmitted to the outside of the cable through the elastic piece, the danger of fire caused by the fact that high temperature cannot be timely discharged inside the cable is prevented, the damage of the cable to the conductor due to external impact force can be effectively isolated through the attachment of multiple groups of elastic pieces to the inner wall of the buffer cavity, and therefore the compression resistance and the service life of the cable are improved;

2. Through setting up of fire extinguishing agent and fire-retardant cotton, when the conflagration breaks out, when the buffer layer catches fire, flame can be blocked by the fire-retardant cotton of buffer intracavity, make flame burn the elastic component that is in extrusion state, when the elastic component that is in extrusion state burns out, its inside fire extinguishing agent can be through inside and outside pressure differential blowout rapidly, put out a fire to the flame, avoid high temperature conduction to on conductor and the insulating layer, extension operating time, prevent that the flame from continuing to burn and causing the damage to the conductor, when the cable is whole twists reverse, form the resistance through the elasticity of elastic component and guide block, prevent that the cable from causing the damage to the conductor because of the torsion, thereby the security and the life of cable have been improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic diagram showing the distribution of the buffer layer structure according to the present invention;

FIG. 3 shows a conductor according to the invention schematic cross-sectional structure;

FIG. 4 is a schematic diagram of a buffer layer structure according to the present invention;

FIG. 5 is a cross-sectional view of an unexpanded structure of a cushioning layer of the present invention;

FIG. 6 is a cross-sectional view of an expanded structure of a cushioning layer of the present invention.

The fire-retardant cotton cable is characterized by comprising 11 parts of conductors, 12 parts of inner protective layers, 13 parts of insulating layers, 14 parts of shielding layers, 15 parts of filling layers, 16 parts of wrapping layers, 17 parts of armor layers, 18 parts of outer protective sleeves, 2 parts of buffer layers, 21 parts of buffer cavities, 22 parts of guide components, 23 parts of guide blocks, 24 parts of elastic parts, 25 parts of expansion cavities, 26 parts of elastic cavities, 27 parts of fire-retardant cotton, and 28 parts of fire-retardant cotton.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

In the use of the cable, when the cable receives external impact force, the insulating layer of the cable is damaged, so that the conductor is deformed or broken, and when the cable is in operation, if the heat generated by the conductor cannot be timely conducted to the outer side of the cable, the inner side temperature of the cable is higher, so that the risk of fire occurs.

Referring to fig. 1 to 4, a compression-resistant explosion-proof cable according to an embodiment of the present invention includes a conductor 11, an inner protection layer 12, an insulation layer 13, a shielding layer 14, a filling layer 15, a tape layer 16, an armor layer 17 and an outer sheath 18, wherein a plurality of groups of buffer layers 2 are sleeved between the tape layer 16 and the armor layer 17, and the plurality of groups of buffer layers 2 are all distributed equidistantly along the length direction of the cable.

Referring to fig. 4 to 6, a buffer cavity 21 is formed in the buffer layer 2, a plurality of groups of guiding assemblies 22 distributed along the circumference at equal intervals are fixedly connected to the inner wall of one side, close to the wrapping layer 16, of the buffer cavity 21, each group of guiding assemblies 22 comprises two symmetrically arranged guiding blocks 23, each group of guiding blocks 23 is made of elastic materials, an elastic piece 24 is connected in a sealing sliding manner in each group of guiding blocks 23, two expansion chambers 25 are formed between the elastic piece 24 and the plurality of guiding blocks 23, an elastic chamber 26 is formed in the elastic piece 24, the elastic piece 24 is made of heat-conducting elastic materials, each guiding block 23 is attached to the outer wall of the elastic piece 24, and gaps are reserved between each group of guiding blocks 23;

the purpose is that when the thermal expansion material in the expansion chamber 25 absorbs heat and expands, the elastic piece 24 is extruded to protrude from the gaps between each group of guide blocks 23 preferentially, so that the guide effect is realized;

And during the expansion of the thermal expansion material, the two guide blocks 23 are driven to bend and deform, as shown in fig. 6, and the purpose is to generate a rebound force through the guide blocks 23, so that the cable has an anti-torsion effect.

Referring to fig. 5 and 6, each expansion chamber 25 is filled with a thermal expansion material, which may be expanded graphite, which rapidly expands in volume against heat, and tightly fills the expansion chamber 25.

Referring to fig. 5 and 6, when the conductor 11 continuously runs and generates heat, the thermal expansion material in the expansion chamber 25 absorbs the heat emitted by the conductor 11 and expands, and the thermal expansion material expands and extrudes the elastic member 24 to move, so that the elastic member 24 moves along the guide block 23 towards the inner wall of the buffer cavity 21, the elastic member 24 is attached to the inner wall of the buffer cavity 21, the elastic member 24 and the buffer layer 2 form a heat transfer channel, the end of the guide block 23 is extruded to tilt along with the movement of the elastic member 24 in the moving process of the elastic member 24, and the elastic end of the guide block 23 is tightly contacted with the elastic member 24 to form a multi-stage buffer barrier to disperse external impact force.

The elastic piece 24 is driven to move through the endothermic expansion characteristic of the expanded graphite, so that the dynamic optimization of a heat conduction path is realized, and the compression-resistant structure is reinforced.

The inner protective layer 12 and the outer sheath 18 are made of polyvinyl chloride flame-retardant and wear-resistant materials, the insulating layer 13 is crosslinked polyethylene, the filling layer 15 is inorganic flame-retardant fiber, and the flame-retardant composite material has good high-temperature-resistant and flame-retardant effects.

Through setting up of elastic component 24 and guide block 23, when conductor 11 continuously moves and generates heat, the heat can be to the diffusion all around, the expansion material in the expansion cavity 25 can absorb the heat and expand, the expansion material expansion on both sides can be to middle extrusion elastic component 24 removal, make elastic component 24 along the clearance between guide block 23 outstanding inner wall to buffer cavity 21 remove, cause elastic component 24 and buffer cavity 21's inner wall laminating, can extrude guide block 23 when the in-process that elastic component 24 removed, make the tip of guide block 23 follow buffer cavity 21's removal perk, then the heat that conductor 11 follow-up produced can pass through elastic component 24 outside the cable, the danger of fire hazard because of the inside unable timely discharge of high temperature that produces of cable has been prevented through multiunit elastic component 24 and buffer cavity 21's inner wall laminating, can effectually keep apart the cable and receive external impact to the injury of conductor 11, thereby the compressive property and the life of cable have been improved.

Example two

In the event of a fire, the cable is burned, which may destroy the internal structure of the cable, expose the conductors to the risk of short-circuiting or even explosion, and thus the device described in the above embodiment is improved.

Referring to fig. 5 and 6, the thermal expansion material in the expansion chamber 25 absorbs the heat emitted by the conductor 11 and expands, and the thermal expansion material expands and presses the elastic member 24 to move, so that the elastic member 24 moves along the guide block 23 toward the inner wall of the buffer chamber 21, the elastic member 24 is attached to the inner wall of the buffer chamber 21, the elastic member 24 and the buffer layer 2 form a heat transfer channel, the elastic member 24 presses the guide block 23 during the movement, so that the end of the guide block 23 lifts up along with the movement of the elastic member 24, and the buffer chamber 21 is divided into a plurality of areas due to the contact between the elastic member 24 and the inner wall of the buffer chamber 21.

When the thermal expansion material expands to press the elastic piece 24 to be in contact with the inner wall of the buffer cavity 21, when the end part of each group of guide blocks 23 is attached to the outer wall of the elastic piece 24, certain resilience force is generated by the guide blocks 23, when the cable rotates clockwise, the buffer layer 2 drives the elastic piece 24 to rotate rightwards, when the elastic piece 24 rotates, resistance is generated by the influence of the elasticity of the right guide block 23, the torsion resistance of the whole buffer layer 2 is enhanced by the resistance of the plurality of elastic pieces 24 and the guide blocks 23, when the cable rotates anticlockwise, resistance is generated by the influence of the elasticity of the left guide block 23, and the whole torsion resistance effect of the cable is realized.

Referring to fig. 5 and 6, the elastic member 24 is filled with a fire extinguishing agent 27, the fire extinguishing agent 27 is made of aluminum hydroxide, and can absorb heat and cool down, dilute oxygen and isolate combustible materials, flame retardant cotton 28 is filled between the buffer cavity 21 and the guide block 23, the flame retardant cotton 28 is made of ceramic fiber or basalt fiber, the prior art will not be repeated, the flame retardant cotton 28 is used for buffering external pressure and delaying fire spreading, the aluminum hydroxide fire extinguishing agent 27 is packaged in the elastic member 24, and the active fire extinguishing is realized by automatically releasing the combustion pressure difference during fire.

Through setting up of fire extinguishing agent 27 and fire-retardant cotton 28, when the conflagration breaks out, when buffer layer 2 catches fire, flame can be blocked by fire-retardant cotton 28 in the buffer chamber 21, make flame burn to being in extrusion state's elastic component 24, when extrusion state's elastic component 24 burns out, its inside fire extinguishing agent 27 can be through inside and outside pressure differential rapid ejection, put out a fire to flame, avoid high temperature conduction to conductor 11 and insulating layer 13, extension operating time, prevent that flame from continuing to burn and causing the damage to conductor 11, when cable is whole twists reverse, form resistance through the elasticity of elastic component 24 and guide block 23, prevent that the cable from causing the damage to conductor 11 because of the torsion, thereby the security and the life of cable have been improved.

Finally, the foregoing description of the preferred embodiment of the invention is provided for the purpose of illustration only, and is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims

1. A pressure-resistant and explosion-proof cable, comprising a conductor, an inner sheath, an insulating layer, a shielding layer, a filling layer, a tape layer, an armor layer, and an outer sheath, characterized in that multiple groups of buffer layers are arranged between the tape layer and the armor layer, and the multiple groups of buffer layers are equidistantly distributed along the length of the cable;

A buffer cavity is defined within the buffer layer, and a plurality of guide assemblies are fixedly connected to the inner wall of the buffer cavity close to the tape layer and distributed equidistantly along the circumference. Each guide assembly includes two symmetrically arranged guide blocks, and the guide blocks are made of elastic material.

Each group of guide blocks is sealed and slidably connected with an elastic member, and two expansion chambers are formed between the elastic member and the plurality of guide blocks. An elastic chamber is opened in the elastic member, and the elastic member is made of a heat-conducting elastic material. Each guide block is in contact with the outer wall of the elastic member, and a gap is left between each group of guide blocks;

Each of the expansion chambers is filled with a thermal expansion material;

The elastic chamber is filled with a fire extinguishing agent;

The buffer cavity and each group of guide blocks are filled with flame-retardant cotton.

2. The pressure-resistant and explosion-proof cable according to claim 1, wherein the thermal expansion material is expanded graphite.

3. The pressure-resistant and explosion-proof cable according to claim 2 is characterized in that: when the conductor continues to run and generates heat, the thermal expansion material in the expansion chamber will absorb the heat emitted by the conductor and expand, and the expansion of the thermal expansion material will squeeze the elastic member to move, and the elastic member moves along the guide block toward the inner wall of the buffer cavity, and the elastic member fits against the inner wall of the buffer cavity, so that the elastic member and the buffer layer form a heat transfer channel.

4. The pressure-resistant and explosion-proof cable according to claim 3, wherein the elastic member squeezes the guide block during movement, causing the end of the guide block to tilt up following the movement of the buffer cavity.

5. The pressure-resistant and explosion-proof cable according to claim 4, wherein the inner protective layer and the outer sheath are made of flame-retardant and wear-resistant polyvinyl chloride.

6. The pressure-resistant and explosion-proof cable according to claim 5, wherein the insulating layer is made of cross-linked polyethylene.

7. The pressure-resistant and explosion-proof cable according to claim 6, wherein the filling layer is made of inorganic flame-retardant fiber.