Compression-resistant explosion-proof cable

Abstract

The invention discloses a compression-resistant explosion-proof cable, which comprises conductors, an inner protective layer, an insulating layer, a shielding layer, a filling layer, a belting layer, an armor layer and an outer sheath, and is characterized in that a plurality of groups of buffer layers are arranged between the belting layer and the armor layer in a sleeving manner, and the plurality of groups of buffer layers are distributed at equal intervals along the length direction of the cable. Through the arrangement of a fire extinguishing agent and flame-retardant cotton, when a fire disaster occurs and a buffer layer catches fire, flames are blocked by the flame-retardant cotton in a buffer cavity, so that the flames burn the elastic piece in an extruded state, and when the elastic piece in the extruded state is burnt out, the fire extinguishing agent in the elastic piece can be rapidly sprayed out through the internal and external pressure difference to extinguish the flames; high temperature is prevented from being conducted to the conductor and the insulating layer, working time is prolonged, flame is prevented from continuously burning to damage the conductor, when the whole cable is twisted, resistance is formed through the elastic force of the elastic piece and the guide block, the cable is prevented from being twisted to damage the conductor, and therefore the safety of the cable is improved, and the service life of the cable is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and more specifically, to a compression-resistant and explosion-proof cable. Background Art

[0002] With the acceleration of industrialization and urbanization, in high-risk environments such as petrochemical, mining, power energy, and rail transit, cables not only need to meet basic electrical conductivity, but also need to have the ability to maintain functional integrity under extreme conditions (such as high temperature, flame, explosion shock, etc.). The compression-resistant and explosion-proof cable is a special cable designed for extreme environments, and its core function is to ensure the safety of power transmission in high-pressure, impact, or flammable and explosive scenarios.

[0003] Chinese Patent with application number CN202510163321.1 discloses a medium-voltage power transmission cable with airtightness in explosive environments, which relates to the technical field of power cables. It includes a central conductor, the outside of the central conductor is tightly coated with internal conductor insulation, the outside of the internal conductor insulation is tightly coated with an insulated conductor shield, a steel tape armor is commonly coated outside multiple insulated conductor shields, the outside of the steel tape armor is tightly coated with a PVC protective sleeve, and an external telescopic expansion protection mechanism is arranged outside the PVC protective sleeve. The invention drives the flame-retardant metal thin net to expand outwards through the characteristic of the flame-retardant expansion rubber strip expanding when heated, and constructs a fire barrier outside the cable through the flame-retardant metal thin net, ensuring that even if there is an open fire inside the cable, it will not ignite the combustible gas outside the cable, thereby effectively improving the overall fire and explosion protection performance of the cable. At the same time, by actively increasing the outer diameter at the fault, it prevents the high voltage inside the cable from breaking through the protective layer and igniting the external combustible gas, improving the overall protection performance of the cable.

[0004] Although the above invention can improve the overall protection ability of the cable, during the use of the cable, when the cable is subjected to external impact, it may cause damage to the cable insulation layer, resulting in the risk of deformation or fracture of the conductor. When the cable is operating, if the heat generated by the conductor cannot be conducted to the outside of the cable in time, it will cause a higher temperature inside the cable, thereby posing a risk of fire. At the same time, when a fire occurs, it will cause the cable to burn, thereby damaging the internal structure of the cable, exposing the conductor and causing a short circuit, and even posing a risk of explosion.

[0005] Therefore, in order to solve the above problems, a compression-resistant and explosion-proof cable is needed. Summary of the Invention

[0006] The object of the present invention is to provide a compression-resistant and explosion-proof cable, aiming to solve the problem that when the cable is subjected to an external impact during use, the cable insulation layer may be damaged, leading to the risk of deformation or fracture of the conductor. When the cable is operating, if the heat generated by the conductor cannot be timely conducted to the outside of the cable, the temperature inside the cable will be relatively high, resulting in the risk of fire. At the same time, when a fire occurs, the cable will burn, which will damage the internal structure of the cable, expose the conductor and cause a short circuit, and even pose a risk of explosion.

[0007] To achieve the above object, the present invention provides the following technical solution: a compression-resistant and explosion-proof cable, including a conductor, an inner sheath, an insulation 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 evenly distributed at equal intervals along the length direction of the cable. A buffer cavity is formed inside the buffer layer. A plurality of guiding components evenly distributed along the circumference are fixedly connected to the inner wall of the buffer cavity close to the tape layer side. Each guiding component includes two symmetrically arranged guiding blocks, and the guiding blocks are made of elastic materials.

[0008] Preferably, an elastic member is hermetically slidably connected inside each guiding block. Two expansion chambers are formed between the elastic member and the plurality of guiding blocks. An elastic chamber is formed inside the elastic member. The elastic member is made of a heat-conducting elastic material. Each guiding block is in contact with the outer wall of the elastic member, and a gap is left between each group of guiding blocks.

[0009] Preferably, each expansion chamber is filled with a thermal expansion material, and the thermal expansion material can be expanded graphite. When expanded graphite encounters heat, its volume expands rapidly, tightly filling the expansion chamber.

[0010] Preferably, the elastic chamber is filled with a fire extinguishing agent, and the fire extinguishing agent can absorb heat and reduce temperature, dilute oxygen and isolate combustibles.

[0011] Preferably, a flame-retardant cotton is filled between the buffer cavity and each guiding block, and the flame-retardant cotton can delay the spread of fire and has a heat preservation effect.

[0012] Preferably, when the conductor continuously operates and generates heat, the thermal expansion material in the expansion chamber will absorb the heat emitted by the conductor and expand. The expansion of the thermal expansion material will squeeze the elastic member to move, and the elastic member moves along the guiding block towards the inner wall of the buffer cavity. The elastic member is in contact with the inner wall of the buffer cavity, so that a heat transfer channel is formed between the elastic member and the buffer layer.

[0013] Preferably, during the movement of the elastic member, it will squeeze the guiding block, causing the end of the guiding block to tilt along with the movement of the buffer cavity.

[0014] Preferably, the inner protective layer and the outer sheath are made of flame-retardant and wear-resistant polyvinyl chloride material.

[0015] Preferably, the insulating layer is made of cross-linked polyethylene as a flame-retardant and wear-resistant material.

[0016] Preferably, the filling layer is made of inorganic flame-retardant fibers, which has good high-temperature resistance and flame-retardant effects.

[0017] Technical effects and advantages of the present invention: 1. Through the arrangement of the elastic member and the guiding block, when the conductor continuously operates and generates heat, the heat will diffuse around. The expansion material in the expansion chamber will absorb the heat and expand. The expansion materials on both sides will expand and squeeze the elastic member to move towards the middle, causing the elastic member to protrude along the gap between the guiding blocks and move towards the inner wall of the buffer chamber, so that the elastic member fits against the inner wall of the buffer chamber. When the elastic member moves, it will squeeze the guiding block, causing the end of the guiding block to tilt following the movement of the buffer chamber. Then, the heat generated by the conductor subsequently will be transferred to the outside of the cable through the elastic member, preventing the danger of fire caused by the inability to timely discharge the high temperature inside the cable. By fitting multiple groups of elastic members against the inner wall of the buffer chamber, it can effectively isolate the damage to the conductor caused by the impact of the outside world on the cable, thereby improving the compressive performance and service life of the cable; 2. Through the arrangement of the fire extinguishing agent and the 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 chamber, causing the flame to burn the elastic member in the squeezed state. When the squeezed elastic member is burned through, the fire extinguishing agent inside it will quickly spray out through the pressure difference inside and outside to extinguish the flame, avoiding the high temperature from being conducted to the conductor and the insulating layer, prolonging the working time, and preventing the flame from continuing to burn and damaging the conductor. When the cable is twisted as a whole, a resistance is formed by the elastic force between the elastic member and the guiding block to prevent the cable from damaging the conductor due to twisting, thereby improving the safety and service life of the cable. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structural distribution of the buffer layer of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the conductor of the present invention; Figure 4 It is a schematic diagram of the buffer layer structure of the present invention; Figure 5 It is a cross-sectional view of the buffer layer in the unexpanded structure of the present invention; Figure 6 It is a cross-sectional view of the buffer layer in the expanded structure of the present invention.

[0019] The reference numerals are: 11, conductor; 12, inner sheath; 13, insulating layer; 14, shielding layer; 15, filling layer; 16, tape layer; 17, armor layer; 18, outer sheath; 2, buffer layer; 21, buffer cavity; 22, guiding component; 23, guiding block; 24, elastic member; 25, expansion chamber; 26, elastic cavity; 27, fire extinguishing agent; 28, flame retardant cotton. Detailed implementation manners

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1 During the use of the cable, when the cable is subjected to an external impact force, it may cause damage to the insulating layer of the cable, resulting in the risk of deformation or fracture of the conductor. When the cable is operating, if the heat generated by the conductor cannot be conducted to the outside of the cable in time, it will cause a relatively high temperature inside the cable, thereby posing a fire hazard.

[0022] Refer to Figures 1 to 4 As shown, a compression-resistant and explosion-proof cable according to an embodiment of the present invention includes a conductor 11, an inner sheath 12, an insulating layer 13, a shielding layer 14, a filling layer 15, a tape layer 16, an armor layer 17 and an outer sheath 18. 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 evenly distributed at equal intervals along the length direction of the cable.

[0023] Refer to Figures 4 to 6 As shown, a buffer cavity 21 is formed inside the buffer layer 2. A plurality of groups of guiding components 22 evenly distributed along the circumference are fixedly connected to the inner wall of the buffer cavity 21 close to the tape layer 16. Each group of guiding components 22 includes two symmetrically arranged guiding blocks 23. The guiding blocks 23 are made of an elastic material. An elastic member 24 is hermetically and slidably connected inside each group of guiding blocks 23. Two expansion chambers 25 are formed between the elastic member 24 and the plurality of guiding blocks 23. An elastic cavity 26 is formed inside the elastic member 24. The elastic member 24 is made of a thermally conductive elastic material. Each guiding block 23 is in contact with the outer wall of the elastic member 24, and a gap is left 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, it will squeeze the elastic member 24 to protrude preferentially from the gap between each group of guiding blocks 23 to achieve its guiding effect; And during the expansion process of the thermal expansion material, it will drive the two guiding blocks 23 to bend and deform, as Figure 6As shown, its purpose is to generate a resilience force through the guiding block 23 to make the cable produce an anti-torsion effect.

[0024] Reference Figure 5 and Figure 6 As shown, each expansion chamber 25 is filled with a thermal expansion material, which can be expanded graphite. When the expanded graphite encounters heat, its volume expands rapidly and tightly fills the expansion chamber 25.

[0025] Reference Figure 5 and Figure 6 As shown, when the conductor 11 continuously operates and generates heat, the thermal expansion material in the expansion chamber 25 will absorb the heat dissipated by the conductor 11 and expand. The expansion of the thermal expansion material will squeeze the elastic member 24 to move, causing the elastic member 24 to move along the guiding block 23 towards the inner wall of the buffer chamber 21. The elastic member 24 fits against the inner wall of the buffer chamber 21, and the elastic member 24 and the buffer layer 2 form a heat transfer channel. During the movement of the elastic member 24, it will squeeze the guiding block 23, causing the end of the guiding block 23 to tilt following the movement of the elastic member 24. The elastic end of the guiding block 23 is in close contact with the elastic member 24, forming a multi-stage buffer barrier to disperse external impact forces.

[0026] Drive the movement of the elastic member 24 through the heat absorption and expansion characteristics of expanded graphite to achieve dynamic optimization of the heat conduction path and strengthen the compressive structure at the same time.

[0027] The inner sheath 12 and the outer sheath 18 are made of polyvinyl chloride flame-retardant and wear-resistant materials, the insulating layer 13 is cross-linked polyethylene, and the filling layer 15 is inorganic flame-retardant fibers, which have good high-temperature resistance and flame-retardant effects.

[0028] Through the arrangement of the elastic member 24 and the guiding block 23, when the conductor 11 continuously operates and generates heat, the heat will spread around. The expansion material in the expansion chamber 25 will absorb the heat and expand. The expansion of the expansion materials on both sides will squeeze the elastic member 24 to move towards the middle, causing the elastic member 24 to protrude along the gap between the guiding blocks 23 and move towards the inner wall of the buffer chamber 21, resulting in the elastic member 24 fitting against the inner wall of the buffer chamber 21. When the elastic member 24 moves, it will squeeze the guiding block 23, causing the end of the guiding block 23 to tilt following the movement of the buffer chamber 21. Then the heat generated by the conductor 11 subsequently will be transferred outside the cable through the elastic member 24, preventing the danger of fire due to the inability to timely discharge the high temperature inside the cable. By the fitting of multiple groups of elastic members 24 against the inner wall of the buffer chamber 21, it can effectively isolate the damage to the conductor 11 caused by the external impact force on the cable, thereby improving the compressive performance and service life of the cable.

[0029] Embodiment 2 When a fire occurs, it will cause the cable to burn, thus damaging the internal structure of the cable, exposing the conductor and causing a short circuit, and even posing a risk of explosion. Therefore, in this embodiment, the device described in the above embodiment is improved.

[0030] Refer to Figure 5 and Figure 6 As shown, the thermal expansion material in the expansion chamber 25 will absorb the heat dissipated by the conductor 11 and expand. The expansion of the thermal expansion material will squeeze the elastic member 24 to move, causing the elastic member 24 to move along the guide block 23 towards the inner wall of the buffer chamber 21. The elastic member 24 fits against the inner wall of the buffer chamber 21, and the elastic member 24 and the buffer layer 2 form a heat transfer channel. During the movement of the elastic member 24, it will squeeze the guide block 23, causing the end of the guide block 23 to tilt following the movement of the elastic member 24. Since the contact between the elastic member 24 and the inner wall of the buffer chamber 21 divides the buffer chamber 21 into multiple regions.

[0031] When the thermal expansion material expands and squeezes the elastic member 24 to contact the inner wall of the buffer chamber 21, and the end of each group of guide blocks 23 fits against the outer wall of the elastic member 24, due to the elasticity of the guide block 23, a certain resilience will be generated at this time. When the cable rotates clockwise, it will cause the buffer layer 2 to drive the elastic member 24 to rotate to the right. When rotating, the elastic member 24 will be affected by the elastic force of the right guide block 23 and generate resistance. The anti-torsion effect of the entire buffer layer 2 is enhanced through the resistance of multiple elastic members 24 and guide blocks 23. When the cable twists counterclockwise, it will also be affected by the elastic force of the left guide block 23 and generate resistance, aiming to achieve the anti-torsion effect of the entire cable.

[0032] Refer to Figure 5 and Figure 6 As shown, the elastic member 24 is filled with a fire extinguishing agent 27. The material of the fire extinguishing agent 27 is aluminum hydroxide, which can absorb heat and reduce the temperature, dilute oxygen and isolate combustibles. A fire retardant cotton 28 is filled between the buffer chamber 21 and the guide block 23. The fire retardant cotton 28 is made of ceramic fiber or basalt fiber. The prior art will not be elaborated here. The fire retardant cotton 28 is used to buffer external pressure and delay the spread of fire. The aluminum hydroxide fire extinguishing agent 27 is encapsulated in the elastic member 24 and is automatically released through the combustion pressure difference during a fire to achieve active fire extinguishing.

[0033] With the arrangement of the fire extinguishing agent 27 and the flame retardant cotton 28, when a fire occurs and the buffer layer 2 catches fire, the flame will be blocked by the flame retardant cotton 28 in the buffer cavity 21, preventing the flame from burning the elastic member 24 in the compressed state. When the elastic member 24 in the compressed state is burned through, the fire extinguishing agent 27 inside it will be quickly ejected through the pressure difference inside and outside to extinguish the flame, avoiding the high temperature from being conducted to the conductor 11 and the insulating layer 13, prolonging the working time, and preventing the flame from continuing to burn and damaging the conductor 11. When the cable is twisted as a whole, a resistance is formed by the elastic force of the elastic member 24 and the guide block 23 to prevent the cable from damaging the conductor 11 due to twisting, thereby improving the safety and service life of the cable.

[0034] Finally, the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compression-resistant and explosion-proof cable, comprising a conductor, an inner sheath, an insulating layer, a shielding layer, a filling layer, a tape wrapping layer, an armor layer and an outer sheath, characterized in that, A plurality of buffer layers are sleeved between the tape layer and the armor layer, and the plurality of buffer layers are equally spaced along the length direction of the cable; A buffer cavity is formed inside the buffer layer. On the inner wall of the buffer cavity close to the tape layer, a plurality of guiding components are fixedly connected and equally spaced along the circumference. Each guiding component includes two symmetrically arranged guiding blocks, and the guiding blocks are made of elastic materials.

2. The anti-compression and explosion-proof cable according to claim 1, wherein: An elastic member is hermetically and slidably connected inside each guiding block. Two expansion chambers are formed between the elastic member and the plurality of guiding blocks. An elastic chamber is formed inside the elastic member. The elastic member is made of a heat-conducting elastic material. Each guiding block is in contact with the outer wall of the elastic member, and a gap is left between each group of guiding blocks.

3. The anti-compression and explosion-proof cable according to claim 2, wherein: Each expansion chamber is filled with a thermal expansion material, which can be expanded graphite. When expanded graphite encounters heat, its volume expands rapidly and tightly fills the expansion chamber.

4. The anti-pressure and explosion-proof cable according to claim 3, wherein: The elastic chamber is filled with a fire extinguishing agent, which can absorb heat to lower the temperature, dilute oxygen and isolate combustibles.

5. The anti-compression and explosion-proof cable according to claim 4, characterized in that: Flame-retardant cotton is filled between the buffer cavity and each group of guiding blocks. The flame-retardant cotton can delay the spread of fire and has a heat preservation effect.

6. The anti-compression and explosion-proof cable according to claim 5, wherein: When the conductor continuously operates and generates heat, the thermal expansion material in the expansion chamber will absorb the heat dissipated by the conductor and expand. The expansion of the thermal expansion material will squeeze the elastic member to move. The elastic member moves along the guiding block towards the inner wall of the buffer cavity, and the elastic member is in contact with the inner wall of the buffer cavity, so that a heat transfer channel is formed between the elastic member and the buffer layer.

7. The anti-compression and explosion-proof cable according to claim 4, characterized in that: During the movement of the elastic member, it will squeeze the guiding block, causing the end of the guiding block to tilt along with the movement of the buffer cavity.

8. The anti-compression and explosion-proof cable according to claim 7, wherein: The inner sheath and the outer sheath are made of polyvinyl chloride flame-retardant and wear-resistant materials.

9. The anti-compression and explosion-proof cable according to claim 8, characterized in that: The insulating layer is made of cross-linked polyethylene flame-retardant and wear-resistant materials.

10. The anti-compression and explosion-proof cable according to claim 9, characterized in that: The filling layer is made of inorganic flame-retardant fibers, which has good high-temperature resistance and flame-retardant effects.

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