Heat-resistant insulated power cable and preparation method thereof

Abstract

The invention discloses a heat-resistant insulated power cable and a preparation method thereof, and relates to the technical field of insulated power cables, the heat-resistant insulated power cable comprises a centering mechanism, the centering mechanism is fixedly mounted on the outer surface of a wire core, and a gap is formed between the outer surface of the wire core and the centering mechanism and is filled with a heat-conducting insulating material. According to the heat-resistant insulated power cable and the preparation method thereof, the heat-shrinkable tube, the outer sleeve and the silica gel filling layer form a protective layer so that gas is not easy to leak, the spiral sheet embedded in the silica gel filling layer enables the cable to be not easy to break, compared with armoring, the spiral sheet enables the cable to be better in bendability, and the plurality of insulation mechanisms sleeve the surface of the longer wire core so that the heat-resistant insulated power cable is more stable in performance. The distance of the cavity gas flow channel is shortened, so that insulating gas in the cavity gas flow channel is easier to control and adjust, traditional flame-retardant coating coating is replaced, and the problem that a flame-retardant material is poor in flame-retardant effect during application due to toxic gas and dehydration reaction is solved.

Description

Technical Field

[0001] The invention relates to the technical field of insulated power cables, in particular to a heat-resistant insulated power cable and a preparation method thereof. Background Art

[0002] The flame retardant layer of traditional cables generally uses a single flame retardant material, which is a halogen flame retardant. When burned, it generates a large amount of smoke and toxic gases, and the amount increases with the increase of combustion temperature. Therefore, it can only be used for low-temperature flame retardancy. The halogen-free flame retardants used in recent years have less smoke and low toxicity, but contain a large amount of hydrated substances. When the temperature is high, the hydrated substances inside the cable will undergo a dehydration reaction, thereby reducing the physical and mechanical properties of the cable. Therefore, the flame retardant temperature cannot be high. Due to the use of a single flame retardant material, the cable either produces a large amount of toxic gases or reduces the cable performance due to dehydration reaction, thereby affecting the flame retardant temperature and flame retardant time of the cable. The Chinese patent announcement number is: CN110504059A, which discloses "A heat-resistant and aging-resistant cable insulation layer and cable thereof". In this patent, a heat-resistant component is added inside the rubber outer sheath. The heat can be directed to other areas inside the cable through the metal isolation net, and the heat radiation is radiated to the outside of the rubber outer sheath through the heat reflection layer to prevent heat from being transmitted to the inside of the rubber inner sheath. The insect-proof powder inside the insect-proof layer can remove insects, and the filling rubber overflowing from the filling layer can fill the damaged crack area of ​​the cable, so that the side surface of the cable remains sealed.

[0003] Existing heat-resistant insulated power cables and their preparation methods have structural design defects, the presence of toxic gases and dehydration reactions that result in poor flame retardant effects of flame retardant materials when used, and insufficient cable insulation performance that causes accelerated material aging and even breakdown and combustion. Summary of the invention

[0004] The present invention provides a heat-resistant insulated power cable and a preparation method thereof, which solves the problems mentioned in the above background technology.

[0005] To achieve the above object, the present invention is implemented by the following technical scheme: a heat-resistant insulated power cable, comprising a core, the core being composed of a copper strand and a cross-linked polyethylene tube, the number of the cores being three, and further comprising: A centering mechanism, the centering mechanism is fixedly mounted on the outer surface of the wire core, a gap is provided between the outer surface of the wire core and the centering mechanism and is filled with heat-conducting insulating material, the centering mechanism is used for blocking, centering and limiting the three wire cores and for extracting the heat generated by the wire core; An insulating mechanism, the insulating mechanism is fixedly mounted on the outer surface of the centering mechanism, a threaded tube is fixedly connected to the surface of the insulating mechanism, the insulating mechanism is used for introducing and discharging insulating gas, and a heat shrink tube and an outer sleeve are respectively fixedly connected to the surface of the insulating mechanism; A support mechanism, wherein the support mechanism is fixedly installed at the middle position of the surface of the insulating mechanism, and the support mechanism is used to form an insulating airflow channel and a protective support for the wire core. If the temperature of the cable conductor is too high or the insulation of the cable is poor, the cable will burn. In the device, three wire cores are separately placed inside the centering mechanism, and the centering mechanism performs heat insulation and centering on the wire core. A heat shrink tube is coated on the outer surface of the support mechanism, and a cavity airflow channel is formed between the heat shrink tube, the support mechanism and the centering mechanism. The insulating mechanism transports the insulating gas to the inside of the airflow channel to achieve insulation protection of the cavity. An anti-overheating mechanism, which is fixedly mounted on the surface of the insulating mechanism near the edge and is used for detecting and adjusting the temperature of the gas in the insulating gas flow channel; The supporting mechanism comprises a plastic shell, the inner side of the plastic shell is provided with a supporting groove, the surface of the plastic shell near the edge is provided with an edge hole, and the outer surface of the plastic shell is fixedly connected with a rubber ring.

[0006] Preferably, a gap is provided between the heat shrink tube and the outer sleeve and a spiral sheet is provided thereon, silicone filler is poured inside the gap, a second injection hole is provided on the surface of the outer sleeve, a cavity is provided inside the shell, and the first injection hole is used to fill the interior of the cavity with thermally conductive insulating coating, and after the wire core passes through the insulating spring strip, the extension tube and the shell in sequence, the thermally conductive insulating coating is poured through the shell to the position between the extension tube and the thermally conductive tape, and the three wire cores are evenly arranged on the surface of the shell.

[0007] Preferably, the supporting mechanism further comprises a plastic strip, the outer surface of which is fixedly mounted on the inner side surface of the plastic shell near the middle, the end surface of the plastic strip is fixedly connected with a triangular plate, the triangular plate is fixedly mounted on the surface of the insulating mechanism near the middle, and a cut is provided on the surface of the rubber ring.

[0008] Preferably, the centering mechanism comprises a shell, a through hole is provided on the shell surface near the edge, a first injection hole is provided in the middle of the shell surface, and an extension tube is fixedly connected to the shell surface near the edge.

[0009] Preferably, the centering mechanism also includes an insulating spring bar, the end face of the insulating spring bar is fixedly connected and installed at the end face position of the extension tube, the surface of the insulating spring bar is coated with a thermally conductive tape, the thermally conductive tape blocks the multiple wire cores, and the multiple thermally conductive tapes are blocked by insulating gas. The insulating gas is preferably sulfur hexafluoride, so that the overall insulation performance of the cable is effectively improved. There are multiple sealing shells, and the position between every two sealing shells forms an independent cavity airflow channel. The oppositely arranged sealing shells are used to regulate the gas inside the independent airflow channel. Under normal conditions, the exhaust pipe on one side introduces insulating gas into the interior of the sealing shell, and the insulating gas fills the cavity airflow channel to play an insulating role.

[0010] Preferably, the insulating spring strip is made of polytetrafluoroethylene, the inner side surface of the thermally conductive tape is close to the outer surface of the wire core, and the extension tube is arranged opposite to the position of the through hole.

[0011] Preferably, the insulating mechanism includes a sealing shell, the inner side surface of the sealing shell is provided with a through hole, the inner side surface of the sealing shell is fixedly connected to the surface of the extension tube, the side position of the sealing shell surface is fixedly connected with a ring body, the plastic strip connects multiple plastic shells, the plastic strip and the plastic shell form a skeleton structure to support the insulating air flow channel, the pins connect the ring body, the outer sleeve and the heat shrink tube, the injection of silicone coating makes the outer sleeve and the outside of the cable firmly sealed, the support groove is used to support and block the wire core, the plastic shell with an inner hollow shell structure makes the wire core firmly supported, and the heat shrink tube is in close contact with the surface of the rubber ring when shrinking.

[0012] Preferably, the insulating mechanism further comprises a pin, and the pin passes through the ring body, the outer sleeve and the heat shrink tube in sequence from the outside to the inside, and a cavity is provided inside the sealing shell.

[0013] Preferably, a suction and exhaust pipe is fixedly connected to the top of the sealing shell, an airflow pipe is fixedly connected to the surface of the sealing shell, and the suction and exhaust pipe, the cavity and the interior of the airflow pipe are connected.

[0014] Preferably, the anti-overheating mechanism includes a tension detector, which is fixedly installed on the surface of the sealing shell near the edge, and the output end of the tension detector is fixedly connected to a telescopic spring, and the end face of the telescopic spring is fixedly connected to a connecting ring, and an insulating air flow channel is formed between the multiple plastic shells and the heat shrink tube. In normal use, insulating gas fills the interior of the air flow channel, and the barrier of the insulating gas insulates the wire cores. The thermal conductive tape and thermal conductive paint reduce the temperature of the wire core, and the exhaust pipe is in a closed state. When the temperature of the conductor inside the wire core is too high, the temperature of the insulating gas is too high due to heat transfer, and this state may still cause the cable to burn.

[0015] Preferably, a rigid strip and an elastic strip are fixedly connected to the surface of the connecting ring, the rigid strip is multiple in number, and a metal sheet is fixedly connected to the position between two rigid strips.

[0016] A method for preparing a heat-resistant insulated power cable comprises the following steps: Step 1, wire core manufacturing, at room temperature, draw the copper rod into copper wire, heat and keep the copper wire, and then naturally cool the copper wire, twist the copper wire by twisting multiple single wires to form a copper stranded wire, use a traction machine to pull the copper stranded wire to be coated with cross-linked polyethylene inside the injection molding extruder, and complete the preparation of the copper conductor wire core, and similarly complete the preparation of the three wire cores; Step 2: forming the centering structure, the shell passes through the sealing shell and is fixedly installed on the surface of the sealing shell, the surface of the insulating spring strip is wrapped with a thermal conductive tape, the wire core is passed through the inner side of the coated thermal conductive tape in sequence, and the thermal conductive insulating coating is poured into the shell and the inside of the thermal conductive tape through the first injection hole and cooled to shape; Step 3: Forming the skeleton structure: Put plastic and rubber particles into the injection molding extruder, and the hot-melt plastic is formed into a plastic shell through the die. Multiple plastic strips pass through the plastic shell in turn and are fixedly joined by hot melting. Multiple plastic shells slide to the outer surface of the thermal conductive tape, and the inner side of the plastic shell is joined to the surface of the thermal conductive tape by heating and melting. The triangle plate is fixedly installed near the middle of the surface of the sealing shell, and then the rubber ring is set on the surface of the plastic shell; Step 4: Heat shrink wrapping. After the tension detector and telescopic spring are fixed on the surface of the sealing shell, the rigid strip and the elastic strip are passed through multiple plastic shells in turn for fixation. The heat shrink tube is put on the surface of the rubber ring and heated. The spiral sheet and the outer sleeve are put on the surface of the heat shrink tube in turn. Then, silicone filler is filled between the outer sleeve and the heat shrink tube and formed.

[0017] The present invention provides a heat-resistant insulated power cable and a preparation method thereof. The cable has the following beneficial effects: 1. The heat-resistant insulated power cable and its preparation method, the heat shrink tube and the outer sleeve and the silicone filling layer form a protective layer to prevent gas leakage, the spiral sheets embedded in the silicone filling layer prevent the cable from breaking easily, and compared with the armor, the spiral sheets make the cable more bendable, and multiple insulating mechanisms are sleeved on the surface of the longer wire core, and the distance of the cavity airflow channel is shortened, which makes the insulating gas inside the cavity airflow channel easier to control and adjust, replacing the traditional flame-retardant coating, and solving the problem that toxic gases and dehydration reactions make the flame-retardant effect of flame-retardant materials poor when used.

[0018] 2. The heat-resistant insulated power cable and its preparation method, the shell blocks multiple cores, so that the influence between the multiple cores is reduced. At the same time, the blocking of the insulating spring strip makes the protection effect of other cores better when a single core is broken. The core is tightly connected to the thermal conductive tape through the coating. In this device, the material of the insulating spring strip is preferably polytetrafluoroethylene, which improves the overall flame retardant insulation performance of the cable. After the thermal conductive insulating coating is cooled and formed, a thermal conductive layer is formed between the thermal conductive insulating coating and the thermal conductive tape, and the outer surface of the thermal conductive tape is inside the cavity air flow channel, and the heat of the core can be quickly transferred to the gas to achieve the purpose of cooling.

[0019] 3. The heat-resistant insulated power cable and its preparation method, after being used for a period of time, the insulating gas is mixed with impurities which will reduce its insulation. The airflow tube on one side is used to push the gas, and the airflow tube on the other side is used to discharge the gas, thereby circulating the gas inside the airflow channel, so that the insulating gas inside the airflow channel is purified and the insulation performance inside the heat shrink tube will not decrease, thus solving the problem of accelerated material aging or even breakdown and combustion caused by insufficient cable insulation performance.

[0020] 4. The heat-resistant insulated power cable and its preparation method, when the heat shrink tube is bent, the incision makes the rubber ring have better bending performance, and multiple plastic shells are evenly arranged inside the heat shrink tube. When the heat shrink tube is heated, the support of the plastic shell forms an air flow channel, and the surface of the plastic shell is provided with multiple edge holes. When the insulating gas is in a circulating flow purification state, the edge structure design of the edge holes makes it easier for the insulating gas to remove tiny impurities deposited on the inner wall of the heat shrink tube when it flows, so that the insulation performance of the air flow channel inside the heat shrink tube is better.

[0021] 5. The heat-resistant insulated power cable and its preparation method, the metal sheet inside the airflow channel is bent by heat, and due to the rigid connection of the rigid strip, the telescopic spring is stretched, and the tension detector detects the change in the tension of the telescopic spring. The exhaust pipe promotes the flow of the insulating gas, and the insulating gas is driven to circulate so that the heat accumulated in the airflow channel is quickly taken away. After the temperature is lowered, the exhaust pipe is closed again. After the temperature of the insulating gas is lowered, the insulation performance is improved. The elastic recovery of the elastic strip allows the metal sheet to be pulled flat, and the overheated position of the cable is accurately located, thereby improving the cable cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of a method for preparing a heat-resistant insulated power cable according to the present invention; Figure 2 It is a stereoscopic diagram of the whole heat-resistant insulated power cable of the present invention; Figure 3 A three-dimensional diagram of the interior of the heat-resistant insulated power cable of the present invention; Figure 4 It is a schematic diagram of the overall structure of the centering mechanism of the present invention; Figure 5 It is a schematic diagram of the structure of a part of the centering mechanism of the present invention; Figure 6 It is a schematic diagram of the structural connection between the support mechanism and the overheating prevention mechanism of the present invention; Figure 7 It is a structural schematic diagram of the insulation mechanism of the present invention; Figure 8 It is a structural schematic diagram of the support mechanism of the present invention; Fig. 9 It is a structural schematic diagram of the overheating prevention mechanism of the present invention; Fig.10 It is a schematic diagram of the structural connection between the centering mechanism and the insulating mechanism of the present invention; In the figure: 1. wire core; 2. centering mechanism; 21. shell; 22. through hole; 23. extension tube; 24. first injection hole; 25. insulating spring strip; 26. thermal conductive tape; 3. insulating mechanism; 31. sealing shell; 32. ring body; 33. pin; 34. exhaust pipe; 35. air flow pipe; 4. threaded tube; 5. supporting mechanism; 51. triangle plate; 52. plastic strip; 53. plastic shell; 54. edge hole; 55. supporting groove; 56. rubber ring; 57. incision; 6. overheating prevention mechanism; 61. tension detector; 62. telescopic spring; 63. rigid strip; 64. metal sheet; 65. elastic strip; 71. heat shrink tube; 72. spiral sheet; 73. outer sleeve; 74. second injection hole. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0024] First embodiment: Figure 1-Figure 3 As shown, the present invention provides a technical solution: a heat-resistant insulated power cable, comprising a core 1, the core 1 is composed of a copper strand and a cross-linked polyethylene tube, the number of the cores 1 is three, and further comprising: A centering mechanism 2 is fixedly mounted on the outer surface of the wire core 1. A gap is provided between the outer surface of the wire core 1 and the centering mechanism 2 and is filled with a heat-conducting insulating material. The centering mechanism 2 is used for the isolation, centering and limiting of the three wire cores 1 and the extraction of heat generated by the wire core 1. The insulating mechanism 3 is fixedly mounted on the outer surface of the centering mechanism 2. The surface of the insulating mechanism 3 is fixedly connected with a threaded tube 4. The insulating mechanism 3 is used for introducing and discharging insulating gas. The surface of the insulating mechanism 3 is respectively fixedly connected with a heat shrink tube 71 and an outer sleeve 73; Support mechanism 5, which is fixedly mounted at the middle of the surface of the insulating mechanism 3, and is used to form an insulating air flow channel and a protective support for the wire core 1; The overheating prevention mechanism 6 is fixedly mounted on the surface of the insulating mechanism 3 near the edge, and is used for detecting and adjusting the gas temperature in the insulating gas flow channel; A gap is provided between the heat shrink tube 71 and the outer sleeve 73 and a spiral sheet 72 is sleeved thereon. Silicone filler is poured into the gap. A second injection hole 74 is provided on the surface of the outer sleeve 73 .

[0025] During use, if the temperature of the cable conductor is too high or the insulation of the cable is poor, the cable may burn. In the device, three cores 1 are placed separately inside the centering mechanism 2, and the centering mechanism 2 insulates and centers the cores 1. The heat shrink tube 71 is coated on the outer surface of the supporting mechanism 5, and a cavity airflow channel is formed between the heat shrink tube 71, the supporting mechanism 5 and the centering mechanism 2. The insulating mechanism 3 transports the insulating gas to the inside of the airflow channel to achieve insulation protection of the cavity. The heat shrink tube 71, the outer sleeve 73 and the silicone filling layer form a protective layer to prevent the gas from leaking. The spiral sheet 72 embedded in the silicone filling layer prevents the cable from breaking. Compared with armor, the spiral sheet 72 makes the cable more bendable. Multiple insulating mechanisms 3 are mounted on the surface of the longer core 1, and the distance of the cavity airflow channel is shortened, which makes the insulating gas inside the cavity airflow channel easier to control and adjust, replacing the traditional flame retardant coating coating, and solving the problem that toxic gases and dehydration reactions make the flame retardant effect of flame retardant materials poor when used.

[0026] Second embodiment: Figure 1-Figure 6 As shown, the centering mechanism 2 includes a shell 21, a through hole 22 is opened on the surface of the shell 21 near the edge, a first injection hole 24 is opened in the middle of the surface of the shell 21, an extension tube 23 is fixedly connected to the surface of the shell 21 near the edge, and the centering mechanism 2 also includes an insulating spring bar 25, the end face of the insulating spring bar 25 is fixedly connected and installed on the end face of the extension tube 23, the surface of the insulating spring bar 25 is coated with a thermal conductive tape 26, the material of the insulating spring bar 25 is polytetrafluoroethylene, the inner side of the thermal conductive tape 26 is close to the outer surface of the core 1, and the extension tube 23 is arranged relative to the position of the through hole 22.

[0027] When in use, a cavity is provided inside the shell 21, and the first injection hole 24 is used to fill the interior of the cavity with thermally conductive insulating coating. After the wire core 1 passes through the insulating spring strip 25, the extension tube 23 and the shell 21 in sequence, the thermally conductive insulating coating is poured into the position between the extension tube 23 and the thermally conductive tape 26 through the shell 21. The three wire cores 1 are evenly arranged on the surface of the shell 21, and the shell 21 blocks the multiple wire cores 1, so that the influence between the multiple wire cores 1 is reduced. At the same time, the blocking of the insulating spring strip 25 makes the protection effect of other wire cores 1 better when a single wire core 1 is broken. The wire core 1 is tightly connected to the thermally conductive tape 26 through the coating. In the device, the material of the insulating spring strip 25 is preferably polytetrafluoroethylene, which improves the flame retardant insulation performance of the entire cable. After the thermally conductive insulating coating is cooled and formed, a thermally conductive layer is formed between the thermally conductive insulating coating and the thermally conductive tape 26, and the outer surface of the thermally conductive tape 26 is inside the cavity air flow channel. The heat of the wire core 1 can be quickly transferred to the gas to achieve the purpose of cooling.

[0028] The third embodiment: Figure 6 , Figure 7 As shown, the insulating mechanism 3 includes a sealing shell 31, the inner side surface of the sealing shell 31 is provided with a through hole, the inner side surface of the sealing shell 31 is fixedly connected to the surface of the extension tube 23, the side position of the surface of the sealing shell 31 is fixedly connected with a ring body 32, the insulating mechanism 3 also includes a pin 33, the pin 33 passes through the ring body 32, the outer sleeve 73 and the heat shrink tube 71 from the outside to the inside in sequence, a cavity is provided inside the sealing shell 31, a drain pipe 34 is fixedly connected to the top of the sealing shell 31, an airflow pipe 35 is fixedly connected to the surface of the sealing shell 31, and the drain pipe 34, the cavity and the airflow pipe 35 are internally connected.

[0029] When in use, the thermally conductive tape 26 blocks the multiple wire cores 1, and the multiple thermally conductive tapes 26 are blocked by insulating gas. The insulating gas is preferably sulfur hexafluoride, so that the overall insulation performance of the cable is effectively improved. There are multiple sealing shells 31, and the position between every two sealing shells 31 forms an independent cavity airflow channel. The oppositely arranged sealing shells 31 are used to regulate the gas inside the independent airflow channel. Under normal conditions, the exhaust pipe 34 on one side passes insulating gas into the interior of the sealing shell 31, and the insulating gas fills the cavity airflow channel to play an insulating role. After being used for a period of time, the insulating gas is mixed with impurities, which will reduce its insulation. The airflow pipe 35 on one side is used to push the gas, and the airflow pipe 35 on the other side is used to exhaust the gas, thereby circulating the gas inside the airflow channel, so that the insulating gas inside the airflow channel is purified and the insulation performance inside the heat shrink tube 71 will not decrease, thereby solving the problem of accelerated material aging or even breakdown and combustion caused by insufficient cable insulation performance.

[0030] Fourth embodiment: Figure 6 , Figure 8As shown, the support mechanism 5 includes a plastic shell 53, the inner side surface of the plastic shell 53 is provided with a support groove 55, the surface of the plastic shell 53 near the edge is provided with an edge hole 54, the outer surface of the plastic shell 53 is fixedly connected with a rubber ring 56, the support mechanism 5 also includes a plastic strip 52, the outer surface of the plastic strip 52 is fixedly installed on the inner side surface of the plastic shell 53 near the middle, the end surface of the plastic strip 52 is fixedly connected with a triangular plate 51, the triangular plate 51 is fixedly installed on the surface of the insulating mechanism 3 near the middle, and the surface of the rubber ring 56 is provided with a cutout 57.

[0031] When in use, the plastic strip 52 connects the multiple plastic shells 53, and the plastic strip 52 and the plastic shell 53 form a skeleton structure to support the insulating airflow channel. The pin 33 connects the ring body 32, the outer sleeve 73 and the heat shrink tube 71. The injection of silicone coating makes the outer sleeve 73 and the outside of the cable firmly sealed. The support groove 55 is used for supporting and blocking the wire core 1. The plastic shell 53 with an inner hollow shell structure makes the wire core 1 firmly supported. When the heat shrink tube 71 shrinks, it is in close contact with the surface of the rubber ring 56, and the heat shrink tube When 71 is bent, the cutout 57 makes the rubber ring 56 have better bending performance, and multiple plastic shells 53 are evenly arranged inside the heat shrink tube 71. When the heat shrink tube 71 is heated, the support of the plastic shell 53 forms an air flow path, and the surface of the plastic shell 53 is provided with multiple edge holes 54. When the insulating gas is in a circulating flow purification state, the edge structure design of the edge holes 54 makes it easier for the insulating gas to remove tiny impurities deposited on the inner wall of the heat shrink tube 71 when it flows, so that the insulation performance of the air flow path inside the heat shrink tube 71 is better.

[0032] Fifth embodiment: Figure 6 , Fig. 9 , Fig.10 As shown, the overheating prevention mechanism 6 includes a tension detector 61, which is fixedly installed on the surface of the sealing shell 31 near the edge. The output end of the tension detector 61 is fixedly connected to a telescopic spring 62, and the end surface of the telescopic spring 62 is fixedly connected to a connecting ring. The surface of the connecting ring is respectively fixedly connected to a rigid strip 63 and an elastic strip 65. There are multiple rigid strips 63, and a metal sheet 64 is fixedly connected to the position between two rigid strips 63.

[0033] When in use, an insulating air flow channel is formed between the multiple plastic shells 53 and the heat shrink tube 71. In normal use, insulating gas fills the inside of the air flow channel. The insulation gas barrier makes the wire cores 1 insulated and protected. The thermal conductive tape 26 and the thermal conductive paint reduce the temperature of the wire core 1. The exhaust pipe 34 is in a closed state. When the temperature of the conductor inside the wire core 1 is too high, the temperature of the insulating gas is too high due to the transfer of heat. In this state, it is still possible to cause the cable to burn. In this device, the metal sheet 64 inside the air flow channel is bent by heat. Due to the rigid connection of the rigid strip 63, the telescopic spring 62 is stretched, and the tension detector 61 detects the change in the tension of the telescopic spring 62. The exhaust pipe 34 promotes the flow of insulating gas. The insulating gas is driven to circulate so that the heat accumulated in the air flow channel is quickly removed. After the temperature is lowered, the exhaust pipe 34 is in a closed state again. After the temperature of the insulating gas is lowered, the insulation performance is improved. The elastic recovery of the elastic strip 65 causes the metal sheet 64 to be pulled flat, accurately locating the overheated position of the cable, thereby improving the cable cooling efficiency.

[0034] Sixth embodiment: Figure 1-Figure 10 As shown, a method for preparing a heat-resistant insulated power cable comprises the following steps: Step 1, wire core manufacturing, at room temperature, drawing a copper rod into a copper wire, heating and keeping the copper wire warm, and then naturally cooling the copper wire, twisting the copper wire by twisting multiple single wires to form a copper stranded wire, using a traction machine to pull the copper stranded wire to be coated to the inside of an injection molding extruder for coating with cross-linked polyethylene, completing the preparation of the copper conductor wire core 1, and similarly completing the preparation of three wire cores 1; Step 2: forming the centering structure, the housing 21 passes through the sealing housing 31 and is fixedly mounted on the surface of the sealing housing 31, the surface of the insulating spring strip 25 is coated with the thermal conductive tape 26, the wire core 1 passes through the inner side of the coated thermal conductive tape 26 in sequence, and the thermal conductive insulating coating is poured into the housing 21 and the thermal conductive tape 26 through the first injection hole 24 and cooled to shape; Step 3: Forming the skeleton structure: Put plastic and rubber particles into the injection molding extruder, and the hot-melt plastic is formed into a plastic shell 53 through the die. Multiple plastic strips 52 pass through the plastic shell 53 in sequence and are fixedly joined by hot melting. Multiple plastic shells 53 slide to the outer surface of the thermal conductive tape 26, and the inner side of the plastic shell 53 is joined to the surface of the thermal conductive tape 26 by heating and melting. The triangle plate 51 is fixedly installed near the middle of the surface of the sealing shell 31, and then the rubber ring 56 is sleeved on the surface of the plastic shell 53; Step 4: Heat shrink wrapping. After the tension detector 61 and the telescopic spring 62 are fixedly installed on the surface of the sealing shell 31, the rigid strip 63 and the elastic strip 65 are passed through multiple plastic shells 53 in turn for fixation. The heat shrink tube 71 is sleeved on the surface of the rubber ring 56 and heated. The spiral sheet 72 and the outer sleeve 73 are sequentially sleeved on the surface of the heat shrink tube 71. Then, silicone filler is filled between the outer sleeve 73 and the heat shrink tube 71 and shaped.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by... does not exclude the existence of other identical elements in the process, method, article or device including the element".

Claims

1. A heat-resistant insulated power cable, comprising a core (1), characterized in that: The wire core (1) is composed of a copper stranded wire and a cross-linked polyethylene tube. The number of the wire cores (1) is three, and the wire cores (1) further include: A centering mechanism (2), the centering mechanism (2) being fixedly mounted on the outer surface of the wire core (1), a gap being provided between the outer surface of the wire core (1) and the centering mechanism (2) and being filled with a heat-conducting insulating material, the centering mechanism (2) being used for blocking, centering and limiting the three wire cores (1) and for conducting heat generated by the wire core (1); An insulating mechanism (3), the insulating mechanism (3) being fixedly mounted on the outer surface of the centering mechanism (2), the surface of the insulating mechanism (3) being fixedly connected to a threaded tube (4), the insulating mechanism (3) being used for introducing and discharging insulating gas, the surface of the insulating mechanism (3) being fixedly connected to a heat shrink tube (71) and an outer sleeve (73); A support mechanism (5), the support mechanism (5) being fixedly mounted at a middle position of the surface of the insulating mechanism (3), the support mechanism (5) being used to form an insulating air flow channel and protective support for the wire core (1); An anti-overheating mechanism (6), the anti-overheating mechanism (6) being fixedly mounted on a surface of the insulating mechanism (3) at a position close to an edge, the anti-overheating mechanism (6) being used for detecting and adjusting the temperature of gas in the insulating gas flow channel; The support mechanism (5) comprises a plastic shell (53), the inner side surface of the plastic shell (53) is provided with a support groove (55), the surface of the plastic shell (53) is provided with an edge hole (54) near the edge, and the outer surface of the plastic shell (53) is fixedly connected with a rubber ring (56).

2. A heat-resistant insulated power cable according to claim 1, characterized in that: A gap is provided between the heat shrink tube (71) and the outer sleeve (73) and is sleeved with a spiral sheet (72); a silicone filler is poured into the gap; and a second injection hole (74) is provided on the surface of the outer sleeve (73).

3. A heat-resistant insulated power cable according to claim 2, characterized in that: The support mechanism (5) further comprises a plastic strip (52), the outer surface of the plastic strip (52) being fixedly mounted on the inner side surface of the plastic shell (53) near the middle, the end surface of the plastic strip (52) being fixedly connected to a triangular plate (51), the triangular plate (51) being fixedly mounted on the surface of the insulating mechanism (3) near the middle, and a notch (57) being provided on the surface of the rubber ring (56).

4. A heat-resistant insulated power cable according to claim 3, characterized in that: The centering mechanism (2) comprises a shell (21), a through hole (22) is provided on the surface of the shell (21) near the edge, a first injection hole (24) is provided in the middle of the surface of the shell (21), and an extension tube (23) is fixedly connected to the surface of the shell (21) near the edge.

5. A heat-resistant insulated power cable according to claim 4, characterized in that: The centering mechanism (2) further comprises an insulating spring strip (25), the end face of the insulating spring strip (25) being fixedly connected and mounted at the end face position of the extension tube (23), and the surface of the insulating spring strip (25) being coated with a heat-conducting adhesive tape (26).

6. A heat-resistant insulated power cable according to claim 5, characterized in that: The insulating spring strip (25) is made of polytetrafluoroethylene, the inner side surface of the thermal conductive tape (26) is close to the outer surface of the wire core (1), and the extension tube (23) and the through hole (22) are arranged relative to each other.

7. A heat-resistant insulated power cable according to claim 6, characterized in that: The insulating mechanism (3) comprises a sealing shell (31), the inner side surface of the sealing shell (31) being provided with a through hole, the inner side surface of the sealing shell (31) being fixedly connected to the surface of the extension tube (23), and a ring body (32) being fixedly connected to the side surface of the sealing shell (31).

8. A heat-resistant insulated power cable according to claim 7, characterized in that: The overheating prevention mechanism (6) comprises a tension detector (61), the tension detector (61) being fixedly mounted on a surface of the sealing shell (31) at a position close to an edge, the output end of the tension detector (61) being fixedly connected to a telescopic spring (62), and the end surface of the telescopic spring (62) being fixedly connected to a connecting ring.

9. A heat-resistant insulated power cable according to claim 8, characterized in that: A rigid strip (63) and an elastic strip (65) are respectively fixedly connected to the surface of the connection ring, there are a plurality of rigid strips (63), and a metal sheet (64) is fixedly connected at a position between two rigid strips (63).

10. A method for preparing a heat-resistant insulated power cable, comprising the following steps: Step 1, manufacturing the wire core, at room temperature, drawing a copper rod into a copper wire, heating and keeping the copper wire warm, and then naturally cooling the copper wire, twisting the copper wire by twisting multiple single wires to form a copper stranded wire, using a traction machine to pull the copper stranded wire to be coated inside an injection molding extruder for coating with cross-linked polyethylene, thereby completing the preparation of the copper conductor wire core (1), and similarly completing the preparation of the three wire cores (1); Step 2: forming the centering structure, the shell (21) passes through the sealing shell (31) and is fixedly mounted on the surface of the sealing shell (31), the surface of the insulating spring strip (25) is coated with a thermal conductive tape (26), the wire core (1) is sequentially passed through the inner side of the coated thermal conductive tape (26), and the thermal conductive insulating coating is poured into the shell (21) and the thermal conductive tape (26) through the first injection hole (24) and cooled to shape; Step 3, forming the skeleton structure, putting plastic and rubber particles into an injection molding extruder, hot-melt plastic is formed into a plastic shell (53) through a die, a plurality of plastic strips (52) pass through the plastic shell (53) in sequence and are fixedly joined by hot melting, a plurality of plastic shells (53) slide to the outer surface of the thermal conductive tape (26), the inner side surface of the plastic shell (53) is joined to the surface of the thermal conductive tape (26) by heating and melting, the triangular plate (51) is fixedly installed on the surface of the sealing shell (31) near the middle, and then the rubber ring (56) is sleeved on the surface of the plastic shell (53); Step 4: Heat shrink wrapping and forming. After the tension detector (61) and the telescopic spring (62) are fixedly mounted on the surface of the sealing shell (31), the rigid strip (63) and the elastic strip (65) are sequentially passed through the plurality of plastic shells (53) for fixing. The heat shrink tube (71) is sleeved on the surface of the rubber ring (56) and heated. The spiral sheet (72) and the outer sleeve (73) are sequentially sleeved on the surface of the heat shrink tube (71). Subsequently, silicone filler is filled between the outer sleeve (73) and the heat shrink tube (71) and the shaping is performed.

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