Preparation method of lightning arrester

Abstract

According to the preparation method of the lightning arrester provided by the invention, the insulating sleeve, the alkali-free glass tape and the vulcanized silicone rubber umbrella cover are sequentially arranged outside the lightning arrester core body for multiple insulation, so that current leakage and short circuit are effectively prevented, stable operation of the lightning arrester in a severe environment is ensured, and the service life of the lightning arrester is prolonged; meanwhile, through a contact type heat conduction structure of the heat dissipation interlayer and the alkali-free glass tape, internal heat generated by the lightning arrester core body can be quickly guided out to the heat dissipation interlayer through the alkali-free glass tape and then dissipated, so that the internal heat can be quickly dissipated to the external environment, and the heat dissipation efficiency is further effectively improved; the use cost of the lightning arrester is reduced; and the use safety of the lightning arrester is improved. In addition, the vulcanized silicone rubber umbrella cover adopts a gradient vulcanization process, so that the surface hydrophobicity and voltage resistance of the prepared vulcanized silicone rubber umbrella cover are effectively enhanced, cracking is effectively prevented, the vulcanized silicone rubber umbrella cover adapts to different environments, and the service life of the vulcanized silicone rubber umbrella cover is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning arrester manufacturing, in particular to a method for preparing a lightning arrester. Background Art

[0002] In the power system, the lightning arrester is a key overvoltage protection device, and its performance stability is directly related to the safe operation of the power grid.

[0003] In actual use, lightning arresters need to withstand higher frequencies of operating overvoltages and lightning strikes. Traditional lightning arresters use a single-layer insulation structure. Due to the single heat dissipation path, the heat generated by the lightning arrester core can only be dissipated through natural convection, resulting in a significant high-temperature accumulation effect, which can easily cause the temperature of the internal resistor to rise, thereby causing performance degradation and shortening the service life. At the same time, the traditional insulation structure is relatively simple, making it difficult to balance mechanical strength and electrical performance. In harsh operating environments, it is easy to break, resulting in current leakage or ground short circuit, reducing the service life of the lightning arrester and causing safety accidents.

[0004] Therefore, in order to improve the quality and safety of lightning arresters, it is necessary to provide a preparation method of lightning arresters with good insulation and heat dissipation properties. Summary of the Invention

[0005] Based on the necessity of safe use and quality improvement of lightning arresters in the prior art, the present invention provides a method for preparing a lightning arrester.

[0006] A method for preparing a lightning arrester, the lightning arrester comprises a base, a lightning arrester core, and a terminal cover, the base comprising a base, the center of the base being concave inward to form a cylindrical supporting groove; an alkali-free glass wire mesh layer, a heat dissipation interlayer, an insulating sleeve, and a vulcanized silicone rubber umbrella sleeve are sequentially sleeved on the outside of the lightning arrester core; the heat dissipation interlayer comprises a set of heat dissipation layers arranged on the outside of the alkali-free glass wire mesh layer and a plurality of heat dissipation strips equidistantly arranged along the inner side of the heat dissipation layer; and the heat dissipation strips are arranged along the length direction of the lightning arrester core, and the terminal cover comprises an end cover and a terminal arranged at the center of the end cover; the method for preparing the lightning arrester comprises: S1, winding a predetermined number of layers of alkali-free glass ribbons on the surface of the lightning arrester core to form the alkali-free glass wire mesh layer, and then coating the surface of the alkali-free glass wire mesh layer with epoxy resin and curing it; S2: sleeve the preformed heat dissipation interlayer on the outside of the alkali-free glass wire mesh layer so that the One end of the heat dissipation strip is away from the heat dissipation layer and abuts against the outer surface of the alkali-free glass mesh layer to obtain a core assembly; S3: one end of the core assembly is accommodated and fixed in the cylindrical supporting groove of the base, so that one end of the arrester core is crimped with the base, and then the insulating sleeve is sleeved on the outside of the core assembly and fixedly connected to the cylindrical supporting groove; S4, the end cover is sleeved on the other end of the core assembly, so that the other end of the arrester core is crimped with the wiring terminal, and the end cover is fixedly connected to the insulating sleeve to obtain the arrester body; S5, the arrester body is loaded into the vulcanization umbrella cover mold and locked, and then vulcanized silicone rubber is injected into the vulcanization umbrella cover mold and gradiently heated to a preset temperature and kept warm for vulcanization, then the heating is stopped and cooled to the mold opening temperature, the vulcanized umbrella cover mold is opened to take out the vulcanized arrester body, and it is cooled and shaped at room temperature, and finally the vulcanized silicone rubber umbrella cover wrapped around the arrester body is obtained.

[0007] Preferably, in step S1, among the predetermined number of layers of alkali-free glass ribbons, the winding directions of any two adjacent layers of alkali-free glass ribbons are opposite to each other to form a cross-mesh structure, and the angle θ between the winding direction of the alkali-free glass ribbons and the central axis of the arrester core is 45°≤θ≤60°. Preferably, step S1 further comprises trimming the outer surface of the solidified alkali-free glass mesh layer so that the outer diameter tolerance of the alkali-free glass mesh layer is controlled within ±0.2 mm.

[0008] Preferably, in step S2, the preformed heat dissipation interlayer is a die-cast aluminum alloy heat dissipation interlayer.

[0009] Preferably, in step S3, the inner side wall of the cylindrical supporting groove is provided with a first internal thread along the circumferential direction, and the outer surface of the insulating sleeve close to the seat body is provided with a first external thread and a first groove, and the first external thread is matched with the first internal thread; the first groove is located above the first external thread, and the insulating sleeve is accommodated and fixed in the cylindrical supporting groove, and is threadably connected to the first internal thread through the first external thread, so that the first sealing ring is in tight contact with the inner side of the cylindrical supporting groove.

[0010] Preferably, in step S4, a second internal thread is provided on the inner circumference of the open end of the end cover, and a second external thread and a second groove are provided on the outer circumference of the insulating sleeve close to the opening of one end of the terminal cover, and the second external thread is matched with the second internal thread; the second groove is located above the second external thread, and the end cover is sleeved on the outside of the insulating sleeve and is threadedly connected to the second external thread through the second internal thread, so that the second sealing ring is in tight contact with the inner side of the end cover, and the terminal is crimped to one end of the arrester core.

[0011] Preferably, in step S5, the step of injecting the vulcanized silicone rubber into the vulcanized umbrella cover mold and then heating the mold to a preset temperature and maintaining the temperature for vulcanization comprises three stages of heating the mold to a preset temperature and maintaining the temperature for vulcanization, which are: Stage 1: Heat to 95-100°C at 1-2°C / min and keep warm for 5-15 minutes; The second stage: heating to 155-160℃ at 3-4℃ / min and keeping warm for 8-20min; The third stage: heat up to 175-180℃ at 1-3℃ / min and keep warm for 5-12 minutes.

[0012] Preferably, the method further comprises step S6: coating an anti-ultraviolet coating on the outside of the vulcanized silicone rubber umbrella cover.

[0013] Preferably, a heat dissipation cavity is formed between the heat dissipation strip, the heat dissipation layer and the alkali-free glass ribbon; a plurality of heat dissipation channels are also provided on the heat dissipation layer, and the heat dissipation channels are connected to the heat dissipation cavity; the vulcanized silicone rubber umbrella cover includes an umbrella cover body and a plurality of skirt-shaped protrusions arranged at intervals in the length direction of the umbrella cover body, and a heat dissipation hole matching the heat dissipation channel is provided at the bottom of the skirt-shaped protrusion, and the heat dissipation channel passes through the insulating sleeve and the vulcanized silicone rubber umbrella cover, and is connected to the corresponding heat dissipation hole.

[0014] Preferably, the arrester core comprises an upper electrode, a resistor assembly, a conductive connection block, an insulating spacer and a lower electrode stacked in series, and the conductive connection block is connected to a grounding bolt.

[0015] The beneficial effects of the present invention are as follows: the present invention provides a method for preparing a lightning arrester, which performs multiple insulation by sequentially arranging an insulating sleeve, an alkali-free glass ribbon, and a vulcanized silicone rubber umbrella cover outside the core of the lightning arrester, thereby effectively preventing current leakage and short circuit, ensuring the stable operation of the lightning arrester in harsh environments, and extending the service life of the lightning arrester; at the same time, through the contact-type heat-conducting structure of the heat dissipation interlayer and the alkali-free glass ribbon, the internal heat generated by the lightning arrester core can be quickly conducted out to the heat dissipation interlayer through the alkali-free glass ribbon and then dissipated, so that the internal heat can be quickly dissipated to the external environment, thereby effectively improving the heat dissipation efficiency, reducing the cost of using the lightning arrester, and improving the safety of using the lightning arrester. In addition, the vulcanized silicone rubber umbrella cover adopts a gradient vulcanization process, which effectively enhances the surface hydrophobicity and voltage resistance of the prepared vulcanized silicone rubber umbrella cover, effectively prevents cracking, adapts to different environments, and effectively extends the service life of the vulcanized silicone rubber umbrella cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of a method for preparing a lightning arrester provided by the present invention; Figure 2 A schematic structural diagram of a lightning arrester provided by the present invention; Figure 3 A schematic cross-sectional view of a lightning arrester provided by the present invention; Figure 4 for Figure 3 A schematic diagram of the enlarged structure of part A; Figure 5 for Figure 3 A schematic diagram of the enlarged structure of part B; Figure 6 A schematic diagram of the cross-sectional structure of the base provided by the present invention; Figure 7 This is a schematic cross-sectional structure diagram of the arrester core provided by the present invention and the alkali-free glass ribbon, heat dissipation layer, and insulating sleeve sequentially arranged outside the arrester core.

[0017] Figure ID 1. Base; 101. Base body; 102. Cylindrical supporting groove; 103. First internal thread; 104. Buffer cavity; 105. Mounting hole; 2. Arrester core; 21. Upper electrode; 22. Conductive connecting block; 23. Insulating pad; 24. Lower electrode 25. Pad; 26. Resistor valve plate; 3. Insulating sleeve; 31. First external thread; 32. First sealing ring; 33. Second external thread; 34. Second sealing ring; 4. Terminal cover; 41. End cover; 42. Terminal; 43. Second internal thread; 5. Vulcanized silicone rubber umbrella cover; 51. Umbrella cover body; 52. Skirt-shaped protrusion; 6. E-glass mesh layer; 7. Heat dissipation interlayer; 71. Heat dissipation layer; 72. Heat dissipation strip; 8. Heat dissipation cavity; 9. Heat dissipation channel; 10. Grounding bolt. DETAILED DESCRIPTION

[0018] To further illustrate the present invention, the following description is provided with reference to the accompanying drawings. It should be noted that the embodiments described below are merely some, and not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0019] refer to Figure 2 and Figure 3 As shown, a method for preparing a lightning arrester, the lightning arrester comprises a base 1, a lightning arrester core 2, and a terminal cover 4, wherein the base 1 includes a base 101, the center of the base 101 is recessed inward to form a cylindrical supporting groove 102; the outside of the lightning arrester core 1 is sequentially covered with an alkali-free glass wire mesh layer 6, a heat dissipation interlayer 7, an insulating sleeve 3 and a vulcanized silicone rubber umbrella cover 5; the heat dissipation interlayer 7 includes a set of heat dissipation layers 71 arranged on the outside of the alkali-free glass wire mesh layer 6 and a plurality of heat dissipation strips 72 equidistantly arranged along the inner side of the heat dissipation layer 71 in a circumferential direction; and the heat dissipation strips 72 are arranged along the length direction of the lightning arrester core 2, and the terminal cover 4 includes an end cover 41 and a terminal 42 arranged at the center of the end cover 41.

[0020] The alkali-free glass ribbon 6 has excellent electrical insulation and arc resistance, which can further isolate the arrester core 2 from the external environment, reduce the risk of local discharge, and improve the insulation reliability of the arrester in high voltage or complex electric field environments. At the same time, the alkali-free glass ribbon 6 has good thermal conductivity and can assist in the heat dissipation of the arrester core 2, avoiding local overheating that causes material aging or performance degradation, and extending the service life of the arrester. And through the triple insulation design of the alkali-free glass wire mesh layer 6, the insulating sleeve 3, and the vulcanized silicone rubber umbrella cover 5, it has an excellent insulating effect on the arrester core 2, effectively preventing current leakage and short circuit, and ensuring the stable operation of the arrester in harsh environments; at the same time, the vulcanized silicone rubber umbrella cover 5 has good weather resistance and aging resistance, can provide good protection for the arrester core 2, and extend the service life of the arrester.

[0021] Specifically, refer to Figure 1 As shown, the preparation method of the lightning arrester includes: Step S1, wrap a predetermined number of layers of alkali-free glass silk ribbons on the surface of the arrester core 2 to form the alkali-free glass silk mesh layer 6, and then coat the surface of the alkali-free glass silk mesh layer 6 with epoxy resin and cure it. The epoxy resin can penetrate and fill the mesh gaps of the glass silk to form a dense insulating layer, thereby improving the insulation performance of the alkali-free glass silk mesh layer 6.

[0022] In step S1, any two adjacent layers of the predetermined number of alkali-free glass ribbons are wound in opposite directions to form a cross-mesh structure, and the angle θ between the winding directions of the alkali-free glass ribbons and the central axis of the arrester core is 45°≤θ≤60°. In this embodiment, the predetermined number of layers is five. The cross-mesh structure ensures tighter interlocking between the layers of alkali-free glass silk ribbons, thereby increasing the tensile strength and impact resistance of the alkali-free glass silk mesh layer 6 by 30%-50%. It also helps block surface creepage paths and improves the power frequency wet flashover voltage. The 45° to 60° angle design helps ensure the axial load-bearing capacity of the alkali-free glass silk mesh layer 6 while providing radial deformation buffering properties.

[0023] Preferably, step S1 also includes trimming the outer surface of the solidified alkali-free glass wire mesh layer 6 so that the outer diameter tolerance of the alkali-free glass wire mesh layer 6 is controlled within ±0.2 mm, thereby improving the dimensional accuracy of the outer surface of the alkali-free glass wire mesh layer 6, facilitating the assembly of subsequent components, and helping to reduce the gap between the alkali-free glass wire mesh layer 6 and the outer components after assembly.

[0024] Combine Figure 4 and Figure 7 As shown, step S2: a preformed heat dissipation interlayer 7 is placed on the outside of the alkali-free glass mesh layer 7, so that the end of the heat dissipation strip 72 away from the heat dissipation layer 71 abuts against the outer surface of the alkali-free glass mesh layer 6, thereby obtaining a core assembly. In this embodiment, the preformed heat dissipation interlayer is a die-cast aluminum alloy heat dissipation interlayer.

[0025] By providing the heat dissipation layer 71 to provide basic heat conduction, the heat dissipation strips 72 extend along the length of the arrester core 2 to form a longitudinal heat conduction path, thereby quickly conducting the heat inside the arrester core 2 to the heat dissipation strips 72 through the alkali-free glass fiber network layer 6, and then to the heat dissipation layer 71. At the same time, the formation of the heat dissipation cavity 8 can further expand the heat dissipation area and improve the heat dissipation performance. The heat in the heat dissipation cavity can be dissipated through the heat dissipation channel 9, so that the internal heat can be quickly dissipated to the external environment, further improving the heat dissipation efficiency.

[0026] Combine Figure 5 and Figure 6 As shown, step S3: one end of the core assembly is accommodated and fixed in the cylindrical supporting groove 102 of the base 1, so that one end of the lightning arrester core 2 is crimped with the base 1, and then the insulating sleeve 3 is sleeved on the outside of the core assembly and fixedly connected to the cylindrical supporting groove 102.

[0027] Among them, in the step S3, the inner wall of the cylindrical supporting groove 102 is provided with a first internal thread 103 along the circumferential direction, and the outer surface of the insulating sleeve 3 close to the seat body 101 is provided with a first external thread 31 and a first groove 32, and the first external thread 31 is matched with the first internal thread 103; the first groove 32 is located above the first external thread 31, and the insulating sleeve 3 is accommodated and fixed in the cylindrical supporting groove 102, and is threadedly connected to the first internal thread 103 through the first external thread 32, so that the first sealing ring is in tight contact with the inner side of the cylindrical supporting groove 102 32.

[0028] In actual use, after the arrester core 2 is installed inside the insulating sleeve 3, the insulating sleeve 3 is inserted into the cylindrical supporting groove 102 near one end of the base body 101, so that the first internal thread 103 matches the first external thread 31 and starts to rotate, and finally the insulating sleeve 3 is fixedly connected to the base 1, and the arrester core 2 is crimped with the base 1. At this time, the first sealing ring 32 is in close contact with the inner side of the cylindrical supporting groove 102 to achieve sealing of the gap between the insulating sleeve 3 and the base 1, thereby achieving a waterproof and dustproof effect, and effectively preventing the external environment from corroding or damaging the inside of the arrester. The detachable design of the insulating sleeve 3 and the base 1 makes it easy for users to disassemble and assemble the arrester, which is conducive to improving the efficiency of repairing and replacing arrester parts.

[0029] Step S4: sleeve the end cap onto the other end of the core assembly so that the other end of the arrester core is crimped to the wiring terminal, and the end cap is fixedly connected to the insulating sleeve to obtain the arrester body.

[0030] Among them, reference Figure 4 As shown, in step S4, a second internal thread is provided on the inner circumference of the open end of the end cover, and a second external thread and a second groove are provided on the outer circumference of the insulating sleeve close to the opening of one end of the terminal cover, and the second external thread is matched with the second internal thread; the second groove is located above the second external thread, and the end cover is sleeved on the outside of the insulating sleeve and is threadedly connected to the second external thread through the second internal thread, so that the second sealing ring is in tight contact with the inner side of the end cover, and the terminal is crimped to one end of the arrester core.

[0031] In actual use, the end cap 41 is sleeved on the outer side of the insulating sleeve 3 near the end of the terminal cover 4, so that the second internal thread 43 matches the second external thread 33 and starts to rotate, and finally the end cap 41 is fixedly connected to the insulating sleeve 3. At this time, the terminal 42 is crimped and connected to one end of the arrester core 2, and the second sealing ring 34 is in close contact with the inner side of the end cap 41 to achieve sealing of the gap between the insulating sleeve 3 and the terminal cover 4, thereby achieving waterproof and dustproof effects. The detachable design of the insulating sleeve 3 and the terminal cover 4 makes it easy for users to disassemble and assemble the arrester, which is conducive to improving the efficiency of repairing and replacing arrester parts.

[0032] The arrester core 2 is installed by crimping, which ensures a good electrical connection between the arrester core 2, the terminal cover 4 and the base 1, helping the arrester to quickly respond to overvoltage and effectively protect the equipment.

[0033] Combine Figure 3 As shown, step S5, the arrester body is loaded into the vulcanized umbrella cover mold and locked, and then vulcanized silicone rubber is injected into the vulcanized umbrella cover mold and then gradually heated to a preset temperature and kept warm for vulcanization. Subsequently, heating is stopped and cooled to the mold opening temperature, and then the vulcanized arrester body is opened from the vulcanized umbrella cover mold to be taken out and cooled at room temperature to form the shape, finally obtaining the vulcanized silicone rubber umbrella cover wrapped around the arrester body. In this embodiment, the two ends of the vulcanized silicone rubber umbrella cover 5 are respectively in contact with the terminal cover 4 and the base 1.

[0034] The vulcanization reaction in the vulcanized silicone rubber is gradually activated through a gradient heating process, thereby avoiding internal stress concentration or overheating decomposition of the silicone rubber material caused by a sudden temperature rise, effectively enhancing the surface hydrophobicity and voltage resistance of the prepared vulcanized silicone rubber umbrella cover, effectively preventing cracking, adapting to different environments, and effectively extending the service life of the vulcanized silicone rubber umbrella cover.

[0035] Wherein, in the step S5, after injecting the vulcanized silicone rubber into the vulcanized umbrella cover mold, gradient heating to a preset temperature and heat preservation vulcanization includes three stages of gradient heating and heat preservation vulcanization, namely: Stage 1: Raise the temperature to 95-100°C at a rate of 1-2°C / min and maintain for 5-15 minutes. A 1-2°C / min temperature increase prevents local overheating, and maintaining for 5-15 minutes ensures the complete decomposition of the vulcanizing agent and the initiation of the cross-linking reaction. Pre-curing at 95-100°C promotes uniform diffusion of the vulcanizing agent into the silicone rubber molecular chains, while preventing premature cross-linking that could lead to decreased fluidity.

[0036] The second stage: heating to 155-160℃ at 3-4℃ / min and keeping warm for 8-20min; by increasing the heating rate to 3-4℃ / min, the process cycle can be shortened, and the temperature of 155-160℃ can accelerate the cross-linking reaction, forming a three-dimensional network structure, and improving the mechanical strength and elasticity of silicone rubber.

[0037] Stage 3: Raise the temperature to 175-180°C at a rate of 1-3°C / min and hold for 5-12 minutes. Raising the temperature to 175-180°C at a rate of 1-3°C / min promotes further rearrangement of the silicone rubber molecular chains, reduces internal defects, and eliminates residual stress. Holding for 5-12 minutes balances vulcanization efficiency and over-vulcanization risk.

[0038] By controlling the temperature in stages, gradual control of the vulcanization reaction is achieved, which is beneficial to improving the quality of the vulcanized silicone rubber umbrella cover 5 and reducing the energy consumption required for vulcanization.

[0039] The method for preparing the arrester further includes step S6: applying an anti-ultraviolet coating on the outside of the vulcanized silicone rubber umbrella cover 5. The anti-ultraviolet coating can block ultraviolet rays from directly irradiating the surface of the vulcanized silicone rubber umbrella cover 5, reduce photodegradation reactions, and help extend the life of the vulcanized silicone rubber umbrella cover 5.

[0040] refer to Figure 4 and Figure 7 As shown, a heat dissipation cavity 8 is formed between the heat dissipation strip 62, the heat dissipation layer 71, and the alkali-free glass ribbon 6. The heat dissipation layer 71 is also provided with a plurality of heat dissipation channels 9, which are connected to the heat dissipation cavity 8. The vulcanized silicone rubber umbrella cover 5 includes an umbrella cover body 51 and a plurality of skirt-like protrusions 52 spaced along the length of the umbrella cover body 51. The bottom of each skirt-like protrusion 52 defines a heat dissipation hole that matches the heat dissipation channel 9. The heat dissipation channel 9 passes through the insulating sleeve 3 and the vulcanized silicone rubber umbrella cover 5 and is connected to the corresponding heat dissipation hole. In this embodiment, a dust-proof rubber filter is provided on each heat dissipation hole to prevent external impurities and dust from entering and clogging the heat dissipation hole.

[0041] The heat dissipation channel 9 passes through the insulating sleeve 3 and the vulcanized silicone rubber umbrella cover 5, and is connected to the heat dissipation holes on the skirt-shaped protrusion 52, so that part of the heat generated by the arrester core can pass through the alkali-free glass fiber network layer 6, the heat dissipation cavity 8, the heat dissipation channel 9 in sequence, and finally dissipate the heat through the heat dissipation holes, which greatly shortens the heat transfer distance and effectively improves the heat dissipation efficiency; the other part of the heat is conducted to the outside world through the alkali-free glass fiber network layer 6, the heat dissipation layer 7, and then through the insulating sleeve 3 and the vulcanized silicone rubber umbrella cover 5, thereby realizing efficient conduction of heat inside the arrester through multiple heat conduction pathways, so that the internal heat can be quickly dissipated to the external environment, effectively reducing the temperature change rate of the arrester during operation, avoiding long-term high temperature that accelerates the thermal aging of the vulcanized silicone rubber umbrella cover 5 and the insulating sleeve 3, resulting in a decrease in insulation performance, ensuring the performance stability of the arrester core 2, and thus greatly extending the service life of the arrester, reducing the cost of use and improving the safety of use.

[0042] refer to Figure 3 and Figure 6 As shown, the arrester core 2 includes an upper electrode 21, a resistor assembly, a conductive connecting block 22, an insulating spacer 23 and a lower electrode 24 stacked in series in a direction close to the base 1, and the conductive connecting block 242 is connected to a grounding bolt 10.

[0043] The resistor plate assembly includes several resistor valve plate groups, with adjacent resistor valve plate groups stacked in series via a spacer 25. The resistor valve plate group includes several resistor valve plates 26 stacked in series, each comprising a zinc oxide resistor valve plate and a hydrophobic layer disposed on the outer surface of the zinc oxide resistor valve plate. Zinc oxide resistor valve plates have excellent nonlinear volt-ampere characteristics, exhibiting high resistance under normal operating voltage. When overvoltage occurs, they quickly conduct and discharge current, effectively limiting the overvoltage amplitude. The hydrophobic coating design forms a hydrophobic barrier on the outside of the zinc oxide resistor valve plate, effectively preventing surface leakage and flashover caused by humid environments.

[0044] In this embodiment, the upper electrode 21 and the lower electrode 24 are both aluminum electrodes, the conductive connecting block 22 is a copper connecting block, and the insulating spacer 23 is a polytetrafluoroethylene spacer.

[0045] refer to Figure 6 As shown, the center of the bottom of the base 1 is recessed inward to form a buffer cavity 104 , and a plurality of mounting holes 105 are opened on the outer side of the center of the base 1 .

[0046] The buffer cavity 104 absorbs external impact energy through structural deformation, preventing stress from being directly transferred to the arrester core 2, and significantly reducing the risk of damage to the arrester core 2. The installation hole 105 allows the arrester to be installed at a preset position.

[0047] The invention provides a preparation method of a lightning arrester, which has good heat dissipation performance and insulation performance, is easy to assemble and disassemble, and has a long service life.

[0048] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention and are not intended to limit the present invention to the specific embodiments described. Obviously, other modifications and variations may be made based on the contents of this specification. The embodiments selected and specifically described in this specification are intended to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. They are not intended to limit the present invention, and any simple variations of the present invention fall within the scope of protection of the present invention.

Claims

1. A method for preparing a lightning arrester, characterized in that: The arrester comprises a base, an arrester core, and a terminal cover. The base comprises a base, the center of which is recessed inward to form a cylindrical supporting groove. An alkali-free glass mesh layer, a heat dissipation interlayer, an insulating sleeve, and a vulcanized silicone rubber umbrella cover are sequentially sleeved on the outside of the arrester core. The heat dissipation interlayer comprises a heat dissipation layer arranged on the outside of the alkali-free glass mesh layer and a plurality of heat dissipation strips arranged equidistantly along the inner side of the heat dissipation layer. The heat dissipation strips are arranged along the length of the arrester core. The terminal cover comprises an end cover and a terminal arranged at the center of the end cover. The preparation method of the lightning arrester comprises: S1. Winding a predetermined number of layers of alkali-free glass ribbons on the surface of the arrester core to form the alkali-free glass mesh layer, and then coating the surface of the alkali-free glass mesh layer with epoxy resin and curing it; S2: Sleeve a preformed heat dissipation interlayer onto the outer side of the alkali-free glass mesh layer, so that the end of the heat dissipation strip away from the heat dissipation layer abuts against the outer surface of the alkali-free glass mesh layer to obtain a core assembly; S3: One end of the core assembly is fixedly received in the cylindrical supporting groove of the base, so that one end of the arrester core is crimped to the base, and then an insulating sleeve is sleeved on the outside of the core assembly and fixedly connected to the cylindrical supporting groove; S4. Sleeve the end cap onto the other end of the core assembly so that the other end of the arrester core is crimped to the wiring terminal and the end cap is fixedly connected to the insulating sleeve to obtain the arrester body; S5. The arrester body is loaded into the vulcanized umbrella cover mold and locked. After the vulcanized silicone rubber is injected into the vulcanized umbrella cover mold, the mold is gradually heated to a preset temperature and kept warm for vulcanization. After that, the heating is stopped and the mold is cooled to the mold opening temperature. The vulcanized arrester body is taken out of the vulcanized umbrella cover mold, and the mold is cooled and shaped at room temperature to finally obtain the vulcanized silicone rubber umbrella cover wrapped around the arrester body.

2. The method for preparing a lightning arrester according to claim 1, wherein: In step S1, among the predetermined number of layers of alkali-free glass ribbons, the winding directions of any two adjacent layers of alkali-free glass ribbons are opposite to each other to form a cross-network structure, and the angle θ between the winding direction of the alkali-free glass ribbons and the central axis of the arrester core is 45°≤θ≤60°.

3. The method for preparing a lightning arrester according to claim 1, characterized in that: Step S1 further includes trimming the outer surface of the solidified alkali-free glass mesh layer so that the outer diameter tolerance of the alkali-free glass mesh layer is controlled within ±0.2 mm.

4. The method for preparing a lightning arrester according to claim 1, characterized in that: In step S2, the preformed heat dissipation interlayer is a die-cast aluminum alloy heat dissipation interlayer.

5. The method for preparing a lightning arrester according to claim 1, characterized in that: In step S3, a first internal thread is provided on the inner side wall of the cylindrical supporting groove along the circumferential direction, and a first external thread and a first groove are provided on the outer surface of the insulating sleeve close to the seat body, and the first external thread is matched with the first internal thread; the first groove is located above the first external thread, and the insulating sleeve is accommodated and fixed in the cylindrical supporting groove, and is threadably connected to the first internal thread through the first external thread, so that the first sealing ring is in tight contact with the inner side of the cylindrical supporting groove.

6. The method for preparing a lightning arrester according to claim 1, characterized in that: In step S4, a second internal thread is provided on the inner circumference of the open end of the end cover, and a second external thread and a second groove are provided on the outer circumference of the insulating sleeve close to the opening of one end of the terminal cover, and the second external thread is matched with the second internal thread; the second groove is located above the second external thread, and the end cover is sleeved on the outside of the insulating sleeve and is threadedly connected to the second external thread through the second internal thread, so that the second sealing ring is in tight contact with the inner side of the end cover.

7. The method for preparing a lightning arrester according to claim 1, characterized in that: In step S5, after the vulcanized silicone rubber is injected into the vulcanized umbrella cover mold, the step of gradient heating to a preset temperature and heat preservation vulcanization includes three stages of gradient heating and heat preservation vulcanization, namely: Stage 1: Raise the temperature to 95-100°C at 1-2°C / min and keep warm for 5-15 minutes; The second stage: heating to 155-160℃ at 3-4℃ / min and keeping warm for 8-20min; The third stage: heat up to 175-180℃ at 1-3℃ / min and keep warm for 5-12 minutes.

8. The method for preparing a lightning arrester according to claim 1, characterized in that: The method further includes step S6: coating an anti-ultraviolet coating on the outer side of the vulcanized silicone rubber umbrella cover.

9. The method for preparing a lightning arrester according to claim 1, characterized in that: A heat dissipation cavity is formed between the heat dissipation strip, the heat dissipation layer and the alkali-free glass ribbon; a plurality of heat dissipation channels are also provided on the heat dissipation layer, and the heat dissipation channels are connected to the heat dissipation cavity; the vulcanized silicone rubber umbrella cover includes an umbrella cover body and a plurality of skirt-shaped protrusions arranged at intervals in the length direction of the umbrella cover body, and a heat dissipation hole matching the heat dissipation channel is provided at the bottom of the skirt-shaped protrusion, and the heat dissipation channel passes through the insulating sleeve and the vulcanized silicone rubber umbrella cover, and is connected to the corresponding heat dissipation hole.

10. The method for preparing a lightning arrester according to claim 1, characterized in that: The arrester core comprises an upper electrode, a resistor assembly, a conductive connection block, an insulating spacer and a lower electrode which are sequentially stacked in series, and the conductive connection block is connected to a grounding bolt.

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