A pressure-resistant and explosion-proof cable

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

Technical Field

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

[0002] With the acceleration of industrialization and urbanization, cables in high-risk environments such as the petrochemical industry, mining, electric power, and rail transit must not only meet basic electrical conductivity requirements but also maintain functional integrity under extreme conditions (such as high temperatures, flames, and explosive shock). Pressure-resistant and explosion-proof cables are specialized cables designed for extreme environments. Their core function is to ensure the safety of power transmission in high-voltage, shock-prone, or flammable and explosive environments.

[0003] A Chinese patent application number CN202510163321.1 discloses an explosive environment airtight medium-voltage power transmission cable, which relates to the technical field of power cables. It includes a central conductor, the outer side of the central conductor is tightly covered with internal conductor insulation, the outer side of the internal conductor insulation is tightly covered with an insulated conductor shield, the outer sides of multiple insulated conductor shields are jointly covered with steel belt armor, the outer side of the steel belt armor is tightly covered with a PVC protective sleeve, and the outer side of the PVC protective sleeve is provided with an external telescopic expansion protection mechanism. The invention uses the heat-expanding property of the flame-retardant expansion rubber strip to drive the flame-retardant metal mesh to expand outward, and constructs a fire barrier on the outside of the cable through the flame-retardant metal mesh to ensure that even if an open flame occurs inside the cable, the combustible gas outside the cable will not be ignited, thereby effectively improving the overall fire and explosion resistance of the cable. At the same time, by actively increasing the outer diameter of the fault point, the high voltage inside the cable is prevented from penetrating the protective layer and igniting the external combustible gas, thereby improving the overall protection performance of the cable.

[0004] Although the above invention can improve the overall protection capability of the cable, when the cable is in use, when the cable is subjected to external impact, the cable insulation layer may be damaged, causing the risk of deformation or breakage of the conductor. If the heat generated by the conductor cannot be transferred to the outside of the cable in time during operation, the temperature inside the cable may be high, resulting in the risk of fire. At the same time, when a fire occurs, the cable may burn, thereby damaging the internal structure of the cable, exposing the conductor and causing a short circuit, or even the risk of explosion.

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

[0006] The purpose of the present invention is to provide a pressure-resistant and explosion-proof cable, which aims to solve the risk that when the cable is used, the cable insulation layer will be damaged and the conductor will be deformed or broken when the cable is subjected to external impact force. If the heat generated by the conductor cannot be conducted to the outside of the cable in time during operation, the temperature inside the cable will be high, thereby posing a risk of fire. At the same time, when a fire occurs, the cable will burn, thereby destroying the internal structure of the cable, exposing the conductor and causing a short circuit, and even the risk of explosion.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: 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, wherein a plurality of buffer layers are arranged between the tape layer and the armor layer, and the plurality of buffer layers are equidistantly distributed along the length of the cable;

[0008] A buffer cavity is provided inside the buffer layer, and a plurality of guide assemblies equidistantly distributed along the circumference are fixedly connected to the inner wall of the buffer cavity close to the wrapping layer. Each guide assembly includes two symmetrically arranged guide blocks, and the guide blocks are made of elastic material.

[0009] Preferably, each group of guide blocks is sealed and slidably connected with an elastic member, two expansion chambers are formed between the elastic member and the multiple guide blocks, an elastic chamber is opened in the elastic member, the elastic member is made of heat-conductive elastic material, each guide block is fitted with the outer wall of the elastic member, and a gap is left between each group of guide blocks.

[0010] Preferably, each of the expansion chambers is filled with a thermal expansion material, which may be expanded graphite. The expanded graphite rapidly expands in volume when exposed to heat, and tightly fills the expansion chamber.

[0011] Preferably, the elastic chamber is filled with a fire extinguishing agent, which can absorb heat, reduce temperature, dilute oxygen and isolate combustibles.

[0012] Preferably, the buffer cavity and each group of guide blocks are filled with flame-retardant cotton, which can delay the spread of fire and has a heat-insulating effect.

[0013] Preferably, when the conductor continues to run and generate 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 part to move, and the elastic part moves along the guide block toward the inner wall of the buffer cavity. The elastic part fits against the inner wall of the buffer cavity, so that the elastic part and the buffer layer form a heat transfer channel.

[0014] Preferably, the elastic member squeezes the guide block during its movement, causing the end of the guide block to tilt up following the movement of the buffer cavity.

[0015] Preferably, the inner protective layer and the outer sheath are made of flame-retardant and wear-resistant polyvinyl chloride.

[0016] Preferably, the insulating layer is made of cross-linked polyethylene, which is a flame retardant and wear-resistant material.

[0017] Preferably, the filling layer is made of inorganic flame-retardant fiber, which has good high temperature resistance and flame retardant effects.

[0018] Technical effects and advantages of the present invention:

[0019] 1. Through the arrangement of the elastic member and the guide block, when the conductor continues to run and generates heat, the heat will diffuse to the surroundings, and the expansion material in the expansion chamber will absorb the heat and expand. The expansion of the expansion material on both sides will squeeze the elastic member toward the middle, causing the elastic member to protrude along the gap between the guide blocks and move toward the inner wall of the buffer chamber, so that the elastic member fits with the inner wall of the buffer chamber. When the elastic member moves, it will squeeze the guide block, causing the end of the guide block to tilt along with the movement of the buffer chamber. Then, the heat subsequently generated by the conductor will be transferred to the outside of the cable through the elastic member, preventing the risk of fire due to high temperature generated inside the cable that cannot be discharged in time. By fitting multiple groups of elastic members to the inner wall of the buffer chamber, the cable can be effectively isolated from damage to the conductor by external impact force, thereby improving the pressure resistance and service life of the cable.

[0020] 2. Through the setting 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, so that the flame will burn the elastic part in the extruded state. When the elastic part in the 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, avoiding 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, the elastic force of the elastic part and the guide block forms resistance to prevent the cable from being damaged by the twisting, thereby improving the safety and service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 Schematic diagram of the buffer layer structure distribution of the present invention;

[0023] Figure 3 Schematic diagram of the cross-sectional structure of the conductor of the present invention;

[0024] Figure 4 Schematic diagram of the buffer layer structure of the present invention;

[0025] Figure 5 This is a cross-sectional view of the unexpanded structure of the buffer layer of the present invention;

[0026] Figure 6 This is a cross-sectional view of the buffer layer expansion structure of the present invention.

[0027] The figures are marked as follows: 11. conductor; 12. inner sheath; 13. insulation layer; 14. shielding layer; 15. filling layer; 16. tape layer; 17. armor layer; 18. outer sheath; 2. buffer layer; 21. buffer cavity; 22. guide assembly; 23. guide block; 24. elastic part; 25. expansion chamber; 26. elastic chamber; 27. fire extinguishing agent; 28. flame retardant cotton. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] When the cable is in use and is subjected to external impact, the cable insulation layer may be damaged, causing the risk of deformation or breakage of the conductor. If the heat generated by the conductor cannot be transferred to the outside of the cable in time during operation, the temperature inside the cable may be high, resulting in the risk of fire.

[0031] refer to Figures 1 to 4 As shown, a pressure-resistant and explosion-proof cable according to an embodiment of the present invention includes a conductor 11, an inner protective layer 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 buffer layers 2 are arranged between the tape layer 16 and the armor layer 17, and the plurality of buffer layers 2 are equidistantly distributed along the length of the cable.

[0032] refer to Figures 4 to 6 As shown, a buffer cavity 21 is provided inside the buffer layer 2. A plurality of guide assemblies 22 are fixedly connected to the inner wall of the buffer cavity 21 on the side close to the wrapping layer 16. Each guide assembly 22 includes two symmetrically arranged guide blocks 23. The guide blocks 23 are made of elastic material. An elastic member 24 is sealed and slidably connected inside each guide block 23. Two expansion chambers 25 are formed between the elastic member 24 and the plurality of guide blocks 23. An elastic chamber 26 is provided inside the elastic member 24. The elastic member 24 is made of a heat-conducting elastic material. Each guide block 23 is in contact with the outer wall of the elastic member 24, and a gap is left between each guide block 23.

[0033] 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 preferentially protrude from the gap between each set of guide blocks 23, thereby achieving its guiding effect;

[0034] In the process of thermal expansion material expansion, the two guide blocks 23 will bend and deform. Figure 6 As shown, the purpose is to generate a rebound force through the guide block 23 to make the cable have an anti-twisting effect.

[0035] refer to Figure 5 and Figure 6 As shown, each expansion chamber 25 is filled with a thermal expansion material, which may be expanded graphite. When the expanded graphite encounters heat, its volume expands rapidly and tightly fills the expansion chamber 25 .

[0036] refer to Figure 5 and Figure 6 As shown, when the conductor 11 continues to run and generate heat, the thermal expansion material in the expansion chamber 25 will absorb the heat emitted by the conductor 11 and expand. The expansion of the thermal expansion material will squeeze 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 cavity 21. The elastic member 24 fits the inner wall of the buffer cavity 21, and the elastic member 24 and the buffer layer 2 form a heat transfer channel. During the movement of the elastic member 24, the guide block 23 will be squeezed, so that the end of the guide block 23 will be tilted following the movement of the elastic member 24. The elastic end of the guide block 23 is in close contact with the elastic member 24 to form a multi-level buffer barrier to disperse the external impact force.

[0037] The elastic member 24 is driven to move by the heat absorption and expansion characteristics of the expanded graphite, thereby achieving dynamic optimization of the heat conduction path and strengthening the pressure-resistant structure.

[0038] The inner protective layer 12 and the outer sheath 18 are made of polyvinyl chloride flame retardant and wear-resistant material, the insulating layer 13 is cross-linked polyethylene, and the filling layer 15 is inorganic flame retardant fiber, which has good high temperature resistance and flame retardant effect.

[0039] Through the arrangement of the elastic member 24 and the guide block 23, when the conductor 11 continues to run and generates heat, the heat will diffuse to the surroundings, and the expansion material in the expansion chamber 25 will absorb the heat and expand. The expansion of the expansion material on both sides will squeeze the elastic member 24 toward the middle, so that the elastic member 24 protrudes along the gap between the guide blocks 23 and moves toward the inner wall of the buffer cavity 21, causing the elastic member 24 to fit with the inner wall of the buffer cavity 21. When the elastic member 24 moves, it will squeeze the guide block 23, so that the end of the guide block 23 will follow the movement of the buffer cavity 21 to tilt up, and then the heat subsequently generated by the conductor 11 will be transferred to the outside of the cable through the elastic member 24, preventing the risk of fire due to high temperature generated inside the cable that cannot be discharged in time. By having multiple groups of elastic members 24 fit together with the inner wall of the buffer cavity 21, the cable can be effectively isolated from damage to the conductor 11 by external impact force, thereby improving the pressure resistance and service life of the cable.

[0040] Example 2

[0041] When a fire occurs, the cable will burn, thereby damaging the internal structure of the cable, exposing the conductor and causing a short circuit or even explosion. Therefore, this embodiment improves the device described in the above embodiment.

[0042] refer to Figure 5 and Figure 6 As shown, the thermal expansion material in the expansion chamber 25 absorbs the heat emitted by the conductor 11 and expands. The expansion of the thermal expansion material will squeeze 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 cavity 21. The elastic member 24 fits the inner wall of the buffer cavity 21, and the elastic member 24 and the buffer layer 2 form a heat transfer channel. During the movement of the elastic member 24, the guide block 23 will be squeezed, so that the end of the guide block 23 will be tilted following the movement of the elastic member 24. Due to the contact between the elastic member 24 and the inner wall of the buffer cavity 21, the buffer cavity 21 is divided into multiple areas.

[0043] When the thermal expansion material expands, it will squeeze the elastic member 24 and contact the inner wall of the buffer cavity 21. When the end of each group of guide blocks 23 fits against the outer wall of the elastic member 24, the guide block 23 is elastic, and the guide block 23 will generate a certain rebound force. When the cable rotates clockwise, the buffer layer 2 will 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 resistance of multiple elastic members 24 and guide blocks 23 can enhance the anti-torque effect of the entire buffer layer 2. When the cable is twisted counterclockwise, it will also be affected by the elastic force of the left guide block 23 and generate resistance. The purpose is to achieve the anti-torque effect of the entire cable.

[0044] refer to Figure 5 and Figure 6As shown, the elastic part 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 cool down, dilute oxygen and isolate combustibles. The buffer cavity 21 and the guide block 23 are filled with flame retardant cotton 28. The flame retardant cotton 28 is made of ceramic fiber or basalt fiber. The existing technology will not be repeated. The flame retardant cotton 28 is used to buffer the external pressure and delay the spread of fire. The aluminum hydroxide fire extinguishing agent 27 is encapsulated in the elastic part 24. In the event of a fire, it is automatically released through the combustion pressure difference to achieve active fire extinguishing.

[0045] Through the arrangement of the fire extinguishing agent 27 and the flame retardant cotton 28, when a fire occurs, when the buffer layer 2 catches fire, the flame will be blocked by the flame retardant cotton 28 in the buffer cavity 21, so that the flame burns the elastic member 24 in the extruded state. When the elastic member 24 in the extruded state burns, the fire extinguishing agent 27 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 11 and the insulating layer 13, extending the working time, and preventing the flame from continuing to burn and causing damage to the conductor 11. When the cable is twisted as a whole, 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.

[0046] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. 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, characterized in that: A plurality of buffer layers are provided between the tape layer and the armor layer, and the plurality of buffer layers are evenly distributed along the length direction 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 explosion-proof cable according to claim 1, characterized in that: The thermal expansion material is expanded graphite.

3. The pressure-resistant and explosion-proof cable according to claim 2, 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. The expansion of the thermal expansion material will squeeze the elastic member to move. The elastic member moves along the guide block toward the inner wall of the buffer chamber. The elastic member fits against the inner wall of the buffer chamber, 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, characterized in that: The elastic member will squeeze the guide block during its 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, characterized in that: The inner protective layer and the outer sheath are made of polyvinyl chloride flame retardant and wear-resistant material.

6. The pressure-resistant and explosion-proof cable according to claim 5, characterized in that: The insulating layer is cross-linked polyethylene.

7. The pressure-resistant and explosion-proof cable according to claim 6, characterized in that: The filling layer is inorganic flame retardant fiber.

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