An airtight, cold-resistant, low-smoke, flame-retardant low-voltage power cable for use in explosive environments

Abstract

The invention discloses an airtight, cold-resistant, low-smoke, flame-retardant, low-voltage power cable for use in an explosive environment, and relates to the technical field of power cables. The cable comprises a central conductor, wherein the outer side of the central conductor is tightly coated with an internal insulation, and the outer sides of a plurality of the internal insulations are jointly coated with an insulating inner sheath, the outer side of the insulating inner sheath is tightly wound with an internal wrapping tape, the outer side of the internal wrapping tape is tightly sleeved with a steel belt armor, and the outer side of the steel belt armor is tightly wrapped with an external wrapping tape. The invention effectively avoids the cable from dissipating heat too quickly in a low-temperature environment and affecting the normal use of the cable, and when the external temperature of the cable is high, the internal telescopic soft bag expands to fill the internal cavity of a limit fan-shaped box, which can accelerate the heat dissipation process of the cable, so that the cable can be kept within a suitable range in a high-temperature environment, ensuring that the internal temperature of the cable can remain stable when operating in low-temperature and high-temperature environments, thereby effectively providing the safety and stability of the cable.

Description

Technical Field

[0001] The invention relates to the technical field of power cables, in particular to an airtight, cold-resistant, low-smoke, flame-retardant low-voltage power cable used in an explosive environment. Background Art

[0002] The circuit generates a circuit or electric spark, but it is not enough to ignite the surrounding flammable and explosive gases. Such a circuit is an explosion-proof safety circuit, and the cable used is an explosion-proof cable, which is characterized by low capacitance, not easy to store charge, good shielding performance and anti-static performance. Compared with ordinary cables, explosion-proof cables have high temperature resistance, corrosion resistance and higher current carrying capacity than ordinary cables. The fire resistance, heat resistance and explosion-proof characteristics of explosion-proof cables can extend their use time in the event of a fire, and can prevent flammable and explosive mixtures from contacting electrical components and possibly causing explosions. Ordinary cables cannot meet the requirements for use in special flammable and explosive environments.

[0003] Explosion-hazardous places, such as chemical companies, gas stations, gas stations, oil companies and other places with extremely high safety requirements, all need to use explosion-proof cables to meet the high safety requirements of these places, and have very strict requirements on cable structure and explosion-proof performance;

[0004] However, due to the lack of corresponding auxiliary adjustment structures during the use of power cables, the heat exchange performance inside the cables cannot be adjusted according to the temperature of the surrounding environment when the cables are used in low-temperature environments, thereby reducing the safety and stability of the power cables. Summary of the invention

[0005] The present invention provides an airtight, cold-resistant, low-smoke, flame-retardant, low-voltage power cable for use in an explosive environment, which can effectively solve the problem that the power cable proposed in the above background technology lacks a corresponding auxiliary adjustment structure during use, resulting in the inability to adjust the heat exchange performance inside the cable according to the temperature of the surrounding environment when the cable is used in a low-temperature environment, thereby reducing the safety and stability of the power cable.

[0006] To achieve the above object, the present invention provides the following technical solution: an airtight cold-resistant low-smoke flame-retardant low-voltage power cable for use in an explosive environment, comprising a central conductor, the outer side of the central conductor is tightly coated with an internal insulation, the outer sides of the multiple internal insulations are jointly coated with an insulating inner sheath, and the outer side of the insulating inner sheath is provided with an insulating outer sheath;

[0007] An internal telescopic isolation and protection mechanism is arranged inside the insulating inner sheath, and the internal telescopic isolation and protection mechanism comprises an internal supporting arc box;

[0008] An internal supporting arc box is embedded and installed in the gaps between the multiple internal insulations inside the insulating inner sheath, a heat-conducting arc sheet is embedded and installed on the outer arc surface of the internal supporting arc box, a liquid-conducting rectangular groove is opened through the middle of the outer straight surface of the internal supporting arc box, and elastic traction round strips are bonded to the middle of both ends of the internal supporting arc box;

[0009] An external gas-liquid circulation regulating mechanism is arranged outside the insulating outer sheath, and the external gas-liquid circulation regulating mechanism comprises a silicone sleeve installed;

[0010] The outer side of the insulating outer sheath is tightly covered with an installation silicone sleeve, the outer side of the installation silicone sleeve is evenly and evenly fixedly connected to the limiting edge strip along the circumferential direction, the inner side of the end face of the limiting edge strip is penetrated by an intake regulating pipe, and the outer side of the end face of the limiting edge strip is penetrated by an exhaust regulating pipe;

[0011] The outer ring of the silicone sleeve is installed with internal isolation arc bags equidistantly connected to the side of the limiting edge strip along the circumferential direction;

[0012] The side surface of the limiting edge strip is covered with an external protective liquid bag at a position corresponding to the outer side of the internal isolation arc bag, and the outer circle of the inner cavity of the external protective liquid bag is filled with a supporting sponge block.

[0013] According to the above technical solution, the outer side of the insulating inner sheath is tightly wound with an inner wrapping tape, the outer side of the inner wrapping tape is tightly sleeved with a steel belt armor, the outer side of the steel belt armor is tightly wound with an outer wrapping tape, and the outer side of the outer wrapping tape is covered with an insulating outer sheath.

[0014] According to the above technical solution, the outer arc surfaces of the internal supporting arc box and the heat conducting arc sheet are tightly fitted with the outer side of the internal insulation, and the outer side surfaces of the internal supporting arc box and the heat conducting arc sheet are flush with each other.

[0015] According to the above technical solution, the ends of the elastic traction round bar are fixedly connected with sliding arc blocks at the positions at both ends of the inner supporting arc box;

[0016] The four outer side surfaces of the internal support arc box correspond to the outer positions of the internal insulation and are fixedly connected to the limited position sector box. The four outer side surfaces of the internal support arc box correspond to the inner positions of the limited position sector box and are bonded with the internal telescopic soft bag. The middle part of one end of the internal support arc box is fixedly installed with a connecting elastic end block.

[0017] The interior of the internal supporting arc box and the internal telescopic soft bag are both filled with heat transfer oil, and the inner cavity of the internal supporting arc box is connected with the inner cavity of the internal telescopic soft bag through the liquid-conducting rectangular groove.

[0018] According to the above technical solution, the outer side surface of the sliding arc block is tightly slidably fitted with the inner wall of the internal supporting arc box, and the outer side of the sliding arc block is filled with air at the position of the outer cavity of the elastic traction round bar;

[0019] A gap is left between the outer side of the internal telescopic soft bag and the inner wall of the limiting sector-shaped box at room temperature, and the cavity between the outer side of the internal telescopic soft bag and the limiting sector-shaped box is a vacuum cavity.

[0020] According to the above technical solution, the arc surfaces on both sides of the outer side of the limit sector box are tightly fitted with the outer side of the internal insulation, and the two internal supporting arc boxes are fixedly connected by connecting elastic end blocks.

[0021] According to the above technical solution, reinforcing cables are installed through the edge and middle of the end surface of the limiting edge strip;

[0022] The inner side of the inner cavity of the internal isolation arc capsule is evenly and equidistantly provided with transverse isolation strips along the axial direction, and the outer side of the inner cavity of the internal isolation arc capsule is evenly and equidistantly provided with isolation axial strips along the arc direction;

[0023] The sides of the air intake regulating pipe and the exhaust regulating pipe are fixedly connected with air guiding tubes, the ends of the internal isolation arc bag are filled with protective arc blocks at the side positions corresponding to the limiting edge strips, the outside of the limiting edge strips are tightly covered with a protective outer net at the outside positions corresponding to the outside of the external protective liquid bag, the outside of the protective outer net is tightly covered with a wear-resistant protective sleeve, the ends of the air guiding tubes on the sides of the air intake regulating pipe are commonly connected with an air intake annular bag, and the ends of the air guiding tubes on the sides of the exhaust regulating pipe are commonly fixedly connected with an exhaust annular bag.

[0024] According to the above technical solution, one side of the intake regulating pipe is fixedly connected to one side of the internal isolation arc bag end surface through a connecting pipe, and one side of the exhaust regulating pipe is fixedly connected to the other side of the internal isolation arc bag end surface through a connecting pipe.

[0025] According to the above technical solution, the transverse isolation strips and the isolation axial strips inside the internal isolation arc bag are crisscrossed with each other, and a gap cavity is still left inside the internal isolation arc bag in the extreme contraction state.

[0026] According to the above technical solution, the external protective liquid bag is filled with foam solution, the air guiding tube passes through the protective arc block, the protective outer net and the wear-resistant protective sleeve, and the air intake annular bag and the exhaust annular bag are interconnected with the external air supply pipeline.

[0027] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a scientific and reasonable structure and is safe and convenient to use:

[0028] 1. An internal telescopic isolation and protection mechanism is provided. The temperature regulation process of the cable is optimized through the mutual cooperation between the components inside the internal telescopic isolation and protection mechanism. Through the gas-liquid alternating structural design inside the internal supporting arc box and the limiting fan-shaped box, the position and expansion volume of the sliding arc block and the internal telescopic soft bag inside the internal supporting arc box can be adjusted according to the temperature during the use of the cable. When the external temperature of the cable is low, the vacuum cavity between the limiting fan-shaped box and the internal telescopic soft bag is used to insulate the inside of the cable, thereby effectively avoiding the cable from dissipating heat too quickly in a low-temperature environment and affecting the normal use of the cable. When the external temperature of the cable is high, the internal telescopic soft bag expands to fill the internal cavity of the limiting fan-shaped box, which can accelerate the heat dissipation process of the cable, so that the cable can be kept within a suitable range in a high-temperature environment, ensuring that the internal temperature of the cable can remain stable when operating in low-temperature and high-temperature environments, thereby effectively providing the safety and stability of the cable.

[0029] At the same time, the internal supporting arc box and the limiting fan-shaped box can synchronously and flexibly support multiple center conductors and internal insulation, thereby effectively preventing the center conductor from being offset and twisted when the cable is bent and swung, ensuring the stability of the internal structure of the cable. At the same time, the deformable structural characteristics of the internal supporting arc box and the limiting fan-shaped box are utilized, so that the internal structure of the cable can be automatically reset after being squeezed and deformed, effectively improving the overall structural strength of the cable.

[0030] 2. An external gas-liquid circulation regulating mechanism is provided. Through the cooperation between the components inside the external gas-liquid circulation regulating mechanism, the active regulation process during the use of the cable is optimized. The air pressure and air flow temperature inside the internal isolation arc bag are regulated by the air intake annular bag and the exhaust annular bag in cooperation with the air intake regulating pipe and the exhaust regulating pipe. When a negative pressure cavity is formed inside the internal isolation arc bag, the heat diffusion efficiency inside the cable can be effectively reduced, thereby achieving heat preservation inside the cable. By introducing airflows of different temperatures into the internal isolation arc bag, the temperature inside the cable can be regulated. When the cable is in an extremely cold environment, the cable is heated internally. When the cable is in a high temperature environment, the cable is quickly cooled internally, effectively improving the environmental adaptability and adjustability of the cable.

[0031] At the same time, the outside of the cable is protected by the inflated internal isolation arc bag and the external protective liquid bag. The retractable characteristics of the internal isolation arc bag and the external protective liquid bag allow the cable to recover quickly after being squeezed from the outside, effectively avoiding damage to the internal components of the cable under the action of external squeezing, thereby effectively improving the cable's anti-squeezing performance. When the cable is punctured, the continuous airflow inside the internal isolation arc bag can be used in conjunction with the soap solution and supporting sponge block inside the external protective liquid bag to produce a large amount of foam at the puncture site, thereby making the gap positioning process for maintenance personnel more convenient, effectively improving the convenience of cable use.

[0032] In summary, the active adjustment process during the use of the cable is optimized through the mutual cooperation between the internal telescopic isolation protection mechanism and the internal gas-liquid circulation adjustment mechanism. The heat absorption and expansion characteristics of the heat transfer oil in the internal supporting arc box and the internal telescopic soft bag are utilized to enable the limit fan-shaped box to assist the cable in insulation according to the temperature difference between the inside and outside of the cable, so as to improve the passive applicability of the cable. When the temperature difference between the inside and outside of the cable exceeds the passive adjustment range of the internal components of the cable, the air intake adjustment pipe and the exhaust adjustment pipe can be used to actively adjust the inside of the cable, thereby further improving the use temperature range of the cable and effectively improving the environmental adaptability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0034] In the attached picture:

[0035] Figure 1 It is a schematic diagram of the structure of the present invention;

[0036] Figure 2 It is a schematic diagram of the structure of the internal isolation arc bag installation of the present invention;

[0037] Figure 3 It is a structural schematic diagram of the end face of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the installation of the heat-conducting arc sheet of the present invention;

[0039] Figure 5 It is a structural schematic diagram of the internal telescopic isolation and protection mechanism of the present invention;

[0040] Figure 6 It is a structural schematic diagram of the external gas-liquid circulation regulating mechanism of the present invention;

[0041] Figure 7 It is a structural schematic diagram of the installation of the supporting sponge block of the present invention;

[0042] Figure 8 It is a structural schematic diagram of the installation of the air intake regulating pipe of the present invention;

[0043] Numbers in the figure: 1, center conductor; 2, internal insulation; 3, insulating inner sheath; 4, internal wrapping tape; 5, steel tape armor; 6, external wrapping tape; 7, insulating outer sheath;

[0044] 8. Internal telescopic isolation protection mechanism; 801. Internal supporting arc box; 802. Heat-conducting arc sheet; 803. Liquid-conducting rectangular groove; 804. Elastic traction round bar; 805. Sliding arc block; 806. Limiting fan-shaped box; 807. Internal telescopic soft bag; 808. Connecting elastic end block;

[0045] 9. External gas-liquid circulation regulating mechanism; 901. Installing silicone sleeve; 902. Limiting edge strip; 903. Reinforcing rope; 904. Inlet regulating pipe; 905. Exhaust regulating pipe; 906. Internal isolation arc bag; 907. Horizontal isolation strip; 908. Isolation axial strip; 909. External protective liquid bag; 910. Support sponge block; 911. Air guide tube; 912. Protective arc block; 913. Protective outer net; 914. Wear-resistant protective sleeve; 915. Inlet annular bag; 916. Exhaust annular bag. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0047] Example: Figure 1-8 As shown, the present invention provides a technical solution, a gas-tight cold-resistant low-smoke flame-retardant low-voltage power cable used in an explosive environment, comprising a central conductor 1, the outer side of the central conductor 1 is tightly coated with an internal insulation 2, the outer sides of multiple internal insulations 2 are jointly coated with an insulating inner sheath 3, the outer side of the insulating inner sheath 3 is tightly wound with an internal wrapping tape 4, the outer side of the internal wrapping tape 4 is tightly sleeved with a steel belt armor 5, the outer side of the steel belt armor 5 is tightly wrapped with an external wrapping tape 6, and the outer side of the external wrapping tape 6 is coated with an insulating outer sheath 7;

[0048] An internal telescopic isolation protection mechanism 8 is provided inside the insulating inner sheath 3. The internal telescopic isolation protection mechanism 8 adjusts the shape of each component according to the position inside the power cable, so that the cable can use different shapes to dissipate heat and keep the inside of the cable warm under different temperature conditions;

[0049] The internal telescopic isolation protection mechanism 8 includes an internal supporting arc box 801, a heat-conducting arc sheet 802, a liquid-conducting rectangular groove 803, an elastic traction round bar 804, a sliding arc block 805, a limiting fan-shaped box 806, an internal telescopic soft bag 807 and a connecting elastic end block 808;

[0050] An internal supporting arc box 801 is embedded and installed in the gaps between the corresponding multiple internal insulations 2 inside the insulating inner sheath 3, and a heat-conducting arc sheet 802 is embedded and installed on the outer arc surface of the internal supporting arc box 801. A liquid-conducting rectangular groove 803 is opened through the middle of the outer straight surface of the internal supporting arc box 801. The outer arc surfaces of the internal supporting arc box 801 and the heat-conducting arc sheet 802 are tightly fitted with the outer sides of the internal insulation 2, and the outer side surfaces of the internal supporting arc box 801 and the heat-conducting arc sheet 802 are flush with each other;

[0051] Elastic traction round bars 804 are bonded to the middle of both ends of the internal supporting arc box 801, and sliding arc blocks 805 are fixedly connected to the ends of the elastic traction round bars 804 at the positions corresponding to the two ends of the internal supporting arc box 801, and the outer side of the sliding arc block 805 is tightly slidably fitted with the inner wall of the internal supporting arc box 801, and the outer side of the sliding arc block 805 is filled with air at the position corresponding to the outer cavity of the elastic traction round bar 804;

[0052] The four outer side surfaces of the internal support arc box 801 correspond to the outer side positions of the internal insulation 2, and the internal telescopic soft capsule 807 is bonded to the four side surfaces of the internal support arc box 801 corresponding to the inner position of the limit fan-shaped box 806. The internal support arc box 801 and the internal telescopic soft capsule 807 are filled with heat transfer oil, and the inner cavity of the internal support arc box 801 is connected to the inner cavity of the internal telescopic soft capsule 807 through the liquid-conducting rectangular groove 803. There is a gap between the outer side of the internal telescopic soft capsule 807 and the inner wall of the limit fan-shaped box 806 at room temperature, and the cavity between the outer side of the internal telescopic soft capsule 807 and the limit fan-shaped box 806 is a vacuum cavity;

[0053] A connecting elastic end block 808 is fixedly installed in the middle of one end of the internal supporting arc box 801, and the arc surfaces on both sides of the outer side of the limiting sector box 806 are tightly fitted with the outer side of the internal insulation 2. The two internal supporting arc boxes 801 are fixedly connected by connecting the elastic end block 808. The temperature regulation process of the cable is optimized through the mutual cooperation between the components inside the internal telescopic isolation protection mechanism 8. The gas-liquid alternating structural design inside the internal supporting arc box 801 and the limiting sector box 806 allows the cable to adjust the position of the sliding arc block 805 inside the internal supporting arc box 801 and the internal telescopic soft bag 807 according to the temperature during use. The position and expansion volume are adjusted so that when the external temperature of the cable is low, the vacuum cavity between the limit sector box 806 and the internal telescopic soft bag 807 is used to insulate the inside of the cable, thereby effectively preventing the cable from dissipating heat too quickly in a low-temperature environment and affecting the normal use of the cable. When the external temperature of the cable is high, the internal telescopic soft bag 807 expands to fill the internal cavity of the limit sector box 806, which can accelerate the heat dissipation process of the cable, so that the cable can be kept within a suitable range in a high-temperature environment, ensuring that the internal temperature of the cable can remain stable when operating in low-temperature and high-temperature environments, thereby effectively providing the safety and stability of the cable.

[0054] At the same time, the internal supporting arc box 801 and the limiting fan-shaped box 806 can synchronously and flexibly support multiple center conductors 1 and internal insulation 2, thereby effectively preventing the center conductor 1 from deflecting and twisting when the cable is bent and swung, ensuring the stability of the internal structure of the cable. At the same time, the deformable structural characteristics of the internal supporting arc box 801 and the limiting fan-shaped box 806 are utilized to enable the internal structure of the cable to automatically reset after being squeezed and deformed, effectively improving the overall structural strength of the cable;

[0055] An external gas-liquid circulation regulating mechanism 9 is arranged outside the insulating outer sheath 7, and the external gas-liquid circulation regulating mechanism 9 regulates the temperature inside the cable by controlling the active circulation of the airflow in the outer ring of the cable and by controlling the temperature of the circulating airflow;

[0056] The external gas-liquid circulation regulating mechanism 9 includes a mounting silicone sleeve 901, a limiting edge strip 902, a reinforcing cable 903, an air intake regulating pipe 904, an air exhaust regulating pipe 905, an internal isolation arc bag 906, a transverse isolation strip 907, an isolation axial strip 908, an external protective liquid bag 909, a supporting sponge block 910, an air guiding capillary 911, a protective arc block 912, a protective outer net 913, a wear-resistant protective sleeve 914, an air intake annular bag 915 and an exhaust annular bag 916;

[0057] The outer side of the insulating outer sheath 7 is tightly covered with an installation silicone sleeve 901, and the outer side of the installation silicone sleeve 901 is evenly and evenly fixedly connected to the limiting edge strip 902 along the circumferential direction. The edge and middle of the end surface of the limiting edge strip 902 are penetrated and installed with a reinforcing cable 903, the inner side of the end surface of the limiting edge strip 902 is penetrated and installed with an intake regulating pipe 904, and the outer side of the end surface of the limiting edge strip 902 is penetrated and installed with an exhaust regulating pipe 905;

[0058] An internal isolation arc bag 906 is equidistantly connected to the side of the limiting edge strip 902 corresponding to the outer ring of the silicone sleeve 901 along the circumferential direction, and one side of the intake regulating pipe 904 is fixedly connected to one side of the end face of the internal isolation arc bag 906 through a connecting pipe, and one side of the exhaust regulating pipe 905 is fixedly connected to the other side of the end face of the internal isolation arc bag 906 through a connecting pipe;

[0059] The inner side of the inner cavity of the internal isolation arc bag 906 is evenly and equidistantly provided with transverse isolation strips 907 along the axial direction, and the outer side of the inner cavity of the internal isolation arc bag 906 is evenly and equidistantly provided with isolation axial strips 908 along the arc direction;

[0060] The side of the limiting edge strip 902 is coated with an external protective liquid capsule 909 at a position corresponding to the outer side of the internal isolation arc capsule 906. The outer circle of the inner cavity of the external protective liquid capsule 909 is filled with a supporting sponge block 910. The transverse isolation strips 907 and the isolation axial strips 908 inside the internal isolation arc capsule 906 are crisscrossed with each other, and a gap cavity is still left inside the internal isolation arc capsule 906 in the extreme contraction state.

[0061] The sides of the air intake regulating pipe 904 and the exhaust regulating pipe 905 are fixedly connected with air guiding tubes 911, the end of the internal isolation arc bag 906 is filled with a protective arc block 912 at the side position corresponding to the limiting edge strip 902, the outer side of the limiting edge strip 902 is tightly covered with a protective outer net 913 at the outer position corresponding to the outer side of the external protective liquid bag 909, and the outer side of the protective outer net 913 is tightly covered with a wear-resistant protective sleeve 914. The ends of the air guiding tubes 911 on the side of the air intake regulating pipe 904 are commonly connected to an air intake annular bag 915, and the ends of the air guiding tubes 911 on the side of the exhaust regulating pipe 905 are commonly fixedly connected to an exhaust annular bag 916, the external protective liquid bag 909 is filled with foam solution, the air guiding tubes 911 penetrate the protective arc block 912, the protective outer net 913 and the wear-resistant protective sleeve 914, and the air intake annular bag 915 and the exhaust annular bag 916 are both The external air supply pipes are interconnected, and the components inside the external gas-liquid circulation regulating mechanism 9 cooperate with each other, thereby optimizing the active regulation process during the use of the cable. The air pressure and air flow temperature inside the internal isolation arc bag 906 are regulated by the air intake annular bag 915 and the exhaust annular bag 916 in cooperation with the air intake regulating pipe 904 and the exhaust regulating pipe 905. When a negative pressure cavity is formed inside the internal isolation arc bag 906, the diffusion efficiency of the heat inside the cable can be effectively reduced, thereby achieving the insulation of the inside of the cable. By introducing airflows of different temperatures into the internal isolation arc bag 906, the temperature inside the cable can be regulated. When the cable is in an extremely cold environment, the inside of the cable is auxiliary heated, and when the cable is in a high temperature environment, the inside of the cable is quickly cooled, thereby effectively improving the environmental adaptability and adjustability of the cable.

[0062] At the same time, the outside of the cable is protected by the inflated internal isolation arc bag 906 and the external protective liquid bag 909. The retractable characteristics of the internal isolation arc bag 906 and the external protective liquid bag 909 allow the cable to recover quickly after being squeezed from the outside, effectively avoiding damage to the internal components of the cable under the action of external squeezing, thereby effectively improving the cable's anti-squeezing performance. When the cable is punctured, the continuous airflow inside the internal isolation arc bag 906 can be used in conjunction with the soap solution inside the external protective liquid bag 909 and the supporting sponge block 910 to produce a large amount of foam at the puncture site, thereby making the gap positioning process for maintenance personnel more convenient, effectively improving the convenience of cable use.

[0063] Working principle and use process of the present invention: In the actual application process of the present invention, during the use of the power cable, it is necessary to first install and connect the central conductor 1 to a suitable position, and then directly protect the outer side of the central conductor 1 through the internal insulation 2, and isolate and shield the outer side of the cable through the internal wrapping tape 4, steel belt armor 5 and external wrapping tape 6 to prevent the cable from being interfered by the electromagnetic field during use, and provide comprehensive protection for the outer side of the cable through the insulating outer sheath 7 to improve the overall protection performance of the cable;

[0064] During the continuous use of the power cable, the cable will continue to heat up as it continuously transmits power. When the temperature of the external environment of the cable is low, the heat diffused outward through the internal insulation 2 is absorbed by the heat-conducting arc sheet 802 and conducted to the inside of the internal support arc box 801. Then, the heat dissipated by the central conductor 1 heats the heat-conducting oil inside the internal support arc box 801, and the heat-conducting oil gradually expands after absorbing heat and heating up. At the same time, the heat-conducting oil absorbs heat and expands, and drives the sliding arc block 805 to overcome the elastic force of the elastic traction round bar 804 and slide toward the two ends of the internal support arc box 801, thereby increasing the pressure inside the internal support arc box 801.

[0065] As the temperature of the heat transfer oil inside the internal supporting arc box 801 continues to rise and expand, the internal telescopic soft capsule 807 will also expand toward the outside of the limit fan-shaped box 806. At this time, the temperature difference between the inside and outside of the cable is large, so that the heat transferred from the inside of the cable to the periphery will diffuse rapidly, so that the overall temperature inside the cable is within a relatively low range. At this time, the expansion degree of the internal telescopic soft capsule 807 is limited and will not completely fill the inside of the limit fan-shaped box 806, so that a vacuum cavity continues to exist between the inner wall of the limit fan-shaped box 806 and the outside of the telescopic soft capsule 807, so as to reduce the path of heat transfer from the inside of the cable to the outside, so that the temperature inside the cable can also be maintained within a suitable range in a low temperature environment;

[0066] When the temperature outside the cable is high and auxiliary heat dissipation is required inside the cable, the heat-conducting oil inside the internal supporting arc box 801 absorbs heat and expands, and the expanded heat-conducting oil will cause the internal telescopic soft bag 807 to completely expand and fill the internal cavity of the limiting fan-shaped box 806. When the internal telescopic soft bag 807 contacts the inner wall of the internal supporting arc box 801, it can transfer heat outward through the internal supporting arc box 801, so that the heat inside the cable can continue to diffuse outward, so as to improve the heat dissipation performance inside the cable, ensure that the cable can be kept within a suitable range when used continuously in a high-temperature environment, further improve the stability of the cable, and provide flexible limiting support for the internal insulation 2 through the internal supporting arc box 801 and the limiting fan-shaped box 806, thereby effectively improving the stability of the internal structure of the cable;

[0067] When the cable needs to be actively adjusted during use, the air intake annular bag 915 and the air exhaust annular bag 916 need to be connected to the external exhaust air pipeline first, and then the air intake annular bag 915 cooperates with the external pipeline to continuously supply air to the inside of the cable, and the air exhaust annular bag 916 cooperates with the external pipeline to continuously exhaust the inside of the cable;

[0068] When the cable is in a low-temperature environment and auxiliary insulation is required inside the cable, the air flow inside the internal isolation arc bag 906 can be sucked through the air intake regulating pipe 904 and the exhaust regulating pipe 905, so that a negative pressure cavity is formed inside the internal isolation arc bag 906, and after the internal isolation arc bag 906 shrinks inward, the side surfaces of the transverse isolation strip 907 and the isolation axial strip 908 fit each other, and then the heat transfer path outside the cable is cut off by the negative pressure cavity inside the internal isolation arc bag 906, which effectively provides the insulation performance inside the cable, so that the inside of the cable can be kept within a suitable temperature range when the cable is running for a long time in a low-temperature environment;

[0069] When the cable is used in an extremely cold environment, if the heat generated inside the cable cannot maintain the temperature inside the cable within a suitable range, warm airflow can be continuously injected into the internal isolation arc bag 906 through the air intake regulating pipe 904 and the exhaust regulating pipe 905, and the warm airflow can be used to provide auxiliary heat insulation to the inside of the cable, thereby ensuring that the cable can operate normally within a suitable temperature range in an extremely cold environment;

[0070] When the internal isolation arc bag 906 is filled with air, the external protective liquid bag 909 is supported by the supporting sponge block 910, and the external protective liquid bag 909 is filled with soap solution, so that the external protective liquid bag 909 and the supporting sponge block 910 provide flexible support to the outside of the cable. When the cable is squeezed from the outside, the squeezing can be buffered by the external protective liquid bag 909 and the internal isolation arc bag 906 filled with air to prevent deformation and damage of the internal components of the cable, thereby effectively improving the cable's anti-squeezing ability.

[0071] When the outside of the cable is damaged by penetration, the outside of the cable is protected by the protective outer net 913 and the wear-resistant protective sleeve 914, so that slight penetration cannot penetrate the outside of the cable to cause damage to its internal components. When the puncture damages the internal components of the cable and affects the normal use of the cable, it is necessary to locate the damaged part in time and repair it. At this time, the airflow inside the internal isolation arc bag 906 can be guided outward through the puncture hole, and when the airflow inside the cable passes through the external protective liquid bag 909, a large amount of foam is formed around the puncture hole through the soap solution inside the external protective liquid bag 909 and the supporting sponge block 910, and then the puncture position is located by the foam to improve the convenience of cable maintenance, and the limiting edge strip 902 is strengthened by the reinforcing rope 903 to improve the overall structural strength of the outer ring of the cable.

[0072] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An airtight, cold-resistant, low-smoke, flame-retardant, low-voltage power cable for use in an explosive environment, comprising a central conductor (1), characterized in that: The outer side of the central conductor (1) is tightly covered with an inner insulation (2), the outer sides of the plurality of inner insulations (2) are jointly covered with an insulating inner sheath (3), and the outer side of the insulating inner sheath (3) is provided with an insulating outer sheath (7); An internal telescopic isolation and protection mechanism (8) is arranged inside the insulating inner sheath (3), and the internal telescopic isolation and protection mechanism (8) comprises an internal supporting arc box (801); An internal supporting arc box (801) is embedded and installed in the gaps between the plurality of internal insulations (2) corresponding to the internal insulating sheath (3), a heat-conducting arc sheet (802) is embedded and installed on the outer arc surface of the internal supporting arc box (801), a liquid-conducting rectangular groove (803) is provided through the middle of the outer straight surface of the internal supporting arc box (801), and elastic traction round strips (804) are bonded to the middle of both ends of the internal supporting arc box (801); The ends of the elastic traction round bar (804) are fixedly connected to sliding arc blocks (805) at positions at both ends of the inner supporting arc box (801); The four outer side surfaces of the internal supporting arc box (801) are fixedly connected to the position of the outer side of the internal insulation (2), the four side surfaces of the internal supporting arc box (801) are bonded to the position of the inner side of the limiting fan-shaped box (806), and the middle part of one end of the internal supporting arc box (801) is fixedly installed with a connecting elastic end block (808); The interior of the internal supporting arc box (801) and the internal telescopic soft bag (807) are both filled with heat transfer oil, and the inner cavity of the internal supporting arc box (801) is connected to the inner cavity of the internal telescopic soft bag (807) via the liquid conducting rectangular groove (803); The outer side surface of the sliding arc block (805) is tightly slidably fitted with the inner wall of the internal supporting arc box (801), and the outer side of the sliding arc block (805) is filled with air at a position corresponding to the outer side cavity of the elastic traction round bar (804); A gap is left between the outer side of the internal telescopic soft bag (807) and the inner wall of the limiting fan-shaped box (806) at room temperature, and the cavity between the outer side of the internal telescopic soft bag (807) and the limiting fan-shaped box (806) is a vacuum cavity; An external gas-liquid circulation regulating mechanism (9) is arranged outside the insulating outer sheath (7), and the external gas-liquid circulation regulating mechanism (9) comprises a mounting silicone sleeve (901); The outer side of the insulating outer sheath (7) is tightly covered with a mounting silicone sleeve (901), the outer side of the mounting silicone sleeve (901) is evenly and evenly fixedly connected to a limiting edge strip (902) along the circumferential direction, the inner side of the end surface of the limiting edge strip (902) is penetrated by an intake regulating pipe (904), and the outer side of the end surface of the limiting edge strip (902) is penetrated by an exhaust regulating pipe (905); The outer ring of the installation silicone sleeve (901) is equidistantly connected with an internal isolation arc bag (906) at a position on the side of the limiting edge strip (902) along the circumferential direction; The side surface of the limiting edge strip (902) corresponding to the outer side of the internal isolation arc bag (906) is coated with an external protective liquid bag (909), and the outer circle of the inner cavity of the external protective liquid bag (909) is filled with a supporting sponge block (910).

2. The airtight, cold-resistant, low-smoke, flame-retardant, low-voltage power cable for use in an explosive environment according to claim 1, characterized in that: The outer side of the insulating inner sheath (3) is tightly wound with an inner wrapping tape (4), the outer side of the inner wrapping tape (4) is tightly sleeved with a steel belt armor (5), the outer side of the steel belt armor (5) is tightly wound with an outer wrapping tape (6), and the outer side of the outer wrapping tape (6) is covered with an insulating outer sheath (7).

3. The airtight, cold-resistant, low-smoke, flame-retardant, low-voltage power cable for use in an explosive environment according to claim 1, characterized in that: The outer arc surfaces of the internal supporting arc box (801) and the heat-conducting arc sheet (802) are tightly fitted to the outer side of the internal insulation (2), and the outer side surfaces of the internal supporting arc box (801) and the heat-conducting arc sheet (802) are flush with each other.

4. The airtight cold-resistant, low-smoke, flame-retardant low-voltage power cable for use in an explosive environment according to claim 1, characterized in that: The arc surfaces on both sides of the outer side of the limiting sector box (806) are tightly fitted to the outer side of the internal insulation (2), and the two internal supporting arc boxes (801) are fixedly connected via a connecting elastic end block (808).

5. The airtight cold-resistant, low-smoke, flame-retardant low-voltage power cable for use in an explosive environment according to claim 1, characterized in that: The end face edge and the middle portion of the limiting edge strip (902) are both penetrated and installed with a reinforcing cable (903); The inner side of the inner cavity of the internal isolation arc bag (906) is evenly and equidistantly provided with transverse isolation strips (907) along the axial direction, and the outer side of the inner cavity of the internal isolation arc bag (906) is evenly and equidistantly provided with isolation axial strips (908) along the arc direction; The sides of the air intake regulating tube (904) and the exhaust regulating tube (905) are both fixedly connected with air guiding tubes (911); the ends of the internal isolation arc bag (906) are filled with protective arc blocks (912) at positions corresponding to the sides of the limiting edge strip (902); the outer sides of the limiting edge strip (902) are tightly covered with protective outer nets (913) at positions corresponding to the outer sides of the external protective liquid bag (909); the outer sides of the protective outer nets (913) are tightly covered with wear-resistant protective sleeves (914); the ends of the air guiding tubes (911) on the sides of the air intake regulating tube (904) are commonly connected with an air intake annular bag (915); and the ends of the air guiding tubes (911) on the sides of the exhaust regulating tube (905) are commonly fixedly connected with an exhaust annular bag (916).

6. The airtight cold-resistant, low-smoke, flame-retardant low-voltage power cable for use in an explosive environment according to claim 5, characterized in that: One side of the air intake regulating pipe (904) is fixedly connected to a position on one side of the end surface of the internal isolation arc bag (906) through a connecting pipe, and one side of the air exhaust regulating pipe (905) is fixedly connected to a position on the other side of the end surface of the internal isolation arc bag (906) through a connecting pipe.

7. The airtight cold-resistant, low-smoke, flame-retardant low-voltage power cable for use in an explosive environment according to claim 5, characterized in that: The transverse isolation strips (907) and the isolation axial strips (908) inside the internal isolation arc bag (906) are crisscrossed with each other, and a gap cavity is still left inside the internal isolation arc bag (906) in the extreme contraction state.

8. The airtight cold-resistant, low-smoke, flame-retardant low-voltage power cable for use in an explosive environment according to claim 5, characterized in that: The external protective liquid bag (909) is filled with a foam solution, the gas-guiding thin tube (911) penetrates the protective arc block (912), the protective outer net (913) and the wear-resistant protective sleeve (914), and the air intake annular bag (915) and the exhaust annular bag (916) are both connected to the external air supply pipeline.

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