A lightning arrester

Abstract

This utility model provides a surge arrester that effectively prevents current leakage and short circuits through a multi-insulation design of insulating sleeves, alkali-free glass fiber tape, and vulcanized silicone rubber sheds, ensuring stable operation of the surge arrester in harsh environments and extending its service life. Simultaneously, the design of heat dissipation jackets, heat dissipation channels, heat dissipation holes, and the formation of a heat dissipation cavity creates an excellent heat conduction path. This allows the internal heat generated by the surge arrester core to be quickly conducted to the heat dissipation jacket via the alkali-free glass fiber tape, and then conducted to the heat dissipation holes through the heat dissipation channels. This significantly shortens the heat transfer distance, enabling the internal heat to dissipate quickly to the external environment, effectively improving heat dissipation efficiency. It also prevents the insulation performance degradation caused by prolonged high temperatures accelerating the thermal aging of the vulcanized silicone rubber sheds and insulating sleeves, ensuring the performance stability of the surge arrester core, further extending the surge arrester's service life, reducing operating costs, and improving safety.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester manufacturing technology, and in particular to a surge arrester. Background Technology

[0002] A surge arrester is a device used to protect electrical equipment from damage caused by lightning overvoltage, switching overvoltage, and power frequency transient overvoltage. It utilizes nonlinear resistance characteristics to present high impedance under normal voltage, but when the voltage exceeds the safety threshold, it quickly conducts current to release the overvoltage energy to the ground, thereby limiting the voltage amplitude on the equipment, preventing insulation breakdown, and ensuring the safe use of the equipment.

[0003] In practical applications, the insulation and heat dissipation performance of surge arresters are crucial standards for evaluating their quality. Good insulation ensures that the surge arrester maintains a high impedance state under normal operating voltage, preventing malfunctions or system grounding short circuits due to current leakage. This maintains the long-term stability of the overall performance of the surge arrester, thereby extending its service life. Similarly, good heat dissipation prevents the performance degradation of the resistor diaphragm and other components caused by overheating, and even avoids the surge arrester bursting. This also extends the surge arrester's service life and reduces operating costs.

[0004] Therefore, in order to extend the service life of surge arresters and improve their quality, it is necessary to provide a surge arrester with good insulation and heat dissipation performance. Utility Model Content

[0005] Based on the necessity of extending the service life and improving the quality of surge arresters in the existing technology, this utility model provides a surge arrester.

[0006] A surge arrester includes a base and a surge arrester core. An insulating sleeve is fixedly mounted on the base, and a terminal cover is mounted on the other end of the insulating sleeve. The surge arrester core is installed inside the insulating sleeve, and both ends of the surge arrester core are respectively pressed against the terminal cover and the base. A vulcanized silicone rubber shed is provided outside the insulating sleeve, and both ends of the vulcanized silicone rubber shed extend in opposite directions until they respectively abut against the terminal cover and the base. An alkali-free glass fiber reinforced plastic (GFRP) tape is wound around the surge arrester core, and a heat dissipation interlayer is provided between the insulating sleeve and the GFRP tape. The heat dissipation interlayer includes a set of components disposed outside the alkali-free GFRP tape. The heat dissipation layer has several heat dissipation strips arranged along the length of the surge arrester core on the side near the alkali-free glass ribbon. The heat dissipation strips abut against the alkali-free glass ribbon and form a heat dissipation cavity between the heat dissipation layer and the alkali-free glass ribbon. The heat dissipation layer has several heat dissipation channels, and the heat dissipation channels are connected to the heat dissipation cavity. The vulcanized silicone rubber umbrella sleeve includes an umbrella sleeve body and several skirt-shaped protrusions arranged at intervals along the length of the umbrella sleeve body. The bottom of the skirt-shaped protrusions has a heat dissipation hole that matches the heat dissipation channel. The heat dissipation channel passes through the insulating sleeve and the vulcanized silicone rubber umbrella sleeve and is connected to the corresponding heat dissipation hole.

[0007] Furthermore, the surge arrester core includes an upper electrode, a resistor assembly, a conductive connecting block, an insulating pad, and a lower electrode, which are sequentially stacked in series along the direction close to the base, and a grounding bolt is provided on the conductive connecting block.

[0008] Furthermore, the resistor assembly includes several resistor valve groups, and adjacent resistor valve groups are stacked in series through a pad.

[0009] Furthermore, the resistor valve assembly includes several resistor valves stacked in series, each resistor valve including a zinc oxide resistor valve and a hydrophobic layer disposed on the outer surface of the zinc oxide resistor valve.

[0010] Furthermore, both the upper and lower electrodes are aluminum electrodes, the conductive connecting block is a copper connecting block, and the insulating pad is a polytetrafluoroethylene pad.

[0011] Furthermore, a rubber filter for dust prevention is provided on the heat dissipation hole.

[0012] Furthermore, the base includes a body, the center of which is recessed inward to form a cylindrical support groove, the inner sidewall of the cylindrical support groove is provided with a first internal thread along the circumference, the outer surface of the insulating sleeve near the body is provided with a first external thread that matches the first internal thread, the insulating sleeve is housed in the cylindrical support groove and is threadedly connected to the first internal thread through the first external thread.

[0013] Furthermore, the outer periphery of the insulating sleeve near the seat is provided with a first groove, the first groove being located above the first external thread, and a first sealing ring being provided in the first groove. The insulating sleeve is threadedly connected to the cylindrical support groove, so that the first sealing ring is in tight contact with the inner side of the cylindrical support groove.

[0014] Furthermore, the terminal cover includes an end cover and a terminal provided on the end cover, and the terminal is pressed against one end of the surge arrester core. The inner circumferential side of the opening end of the end cover is provided with a second internal thread, and the outer circumferential side of the insulating sleeve near the opening end of the terminal cover is provided with a second external thread that matches the second internal thread. The end cover is sleeved on the insulating sleeve and is threadedly connected to the second external thread through the second internal thread.

[0015] Furthermore, the insulating sleeve is provided with a second groove on the outer periphery near the terminal cover. The second groove is located above the second external thread, and a second sealing ring is provided in the second groove. The terminal cover is threadedly connected to the insulating sleeve, so that the second sealing ring is in tight contact with the inner side of the terminal cover.

[0016] Furthermore, the bottom center of the base is recessed inward to form a buffer cavity, and several mounting holes are provided on the outer side of the center of the base.

[0017] The beneficial effects of this utility model are as follows: The surge arrester provided by this utility model, through the multiple insulation design of the insulating sleeve, alkali-free glass ribbon, and vulcanized silicone rubber shed, effectively prevents current leakage and short circuits, ensures the stable operation of the surge arrester in harsh environments, and extends the service life of the surge arrester. At the same time, through the setting of heat dissipation jacket, heat dissipation channel, and heat dissipation hole, as well as the formation of heat dissipation cavity, a good heat conduction path is formed, which can quickly conduct the internal heat generated by the surge arrester core to the heat dissipation jacket via the alkali-free glass ribbon, and then conduct it to the heat dissipation hole through the heat dissipation channel, which greatly shortens the heat transfer distance and allows the internal heat to be quickly dissipated to the external environment, effectively improving heat dissipation efficiency. This avoids the thermal aging of the vulcanized silicone rubber shed and insulating sleeve caused by long-term high temperature, which leads to a decline in insulation performance, ensures the performance stability of the surge arrester core, further extends the service life of the surge arrester, reduces the cost of use, and improves the safety of use. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a surge arrester provided by this utility model;

[0019] Figure 2 A cross-sectional structural diagram of a surge arrester provided by this utility model;

[0020] Figure 3for Figure 2 A magnified structural diagram of part A;

[0021] Figure 4 for Figure 2 A schematic diagram of the enlarged structure of part B;

[0022] Figure 5 A schematic diagram of the cross-sectional structure of the base provided by this utility model;

[0023] Figure 6 A schematic diagram of the cross-sectional structure of the surge arrester core and the alkali-free glass ribbon, heat dissipation layer and insulating sleeve sequentially arranged outside the surge arrester core, provided by this utility model.

[0024] Attached Figure

[0025] 1. Base; 101. Seat body; 102. Cylindrical support groove; 103. First internal thread; 104. Buffer cavity; 105. Mounting hole; 2. Surge arrester core; 21. Upper electrode; 22. Conductive connection block; 23. Insulating pad; 24. Lower electrode; 25. Pad; 26. Resistance valve plate; 3. Insulating sleeve; 31. First external thread; 32. First sealing ring; 33. Second external thread; 34. Second sealing ring; 4. Terminal cap; 41. End cap; 42. Terminal; 43. Second internal thread; 5. Silicone rubber umbrella sleeve; 51. Umbrella sleeve body; 52. Skirt-shaped protrusion; 6. Alkali-free glass fiber tape; 7. Heat dissipation interlayer; 71. Heat dissipation layer; 72. Heat dissipation strip; 8. Heat dissipation cavity; 9. Heat dissipation channel; 10. Grounding bolt. Detailed Implementation

[0026] To provide a more detailed description of this utility model, the following description is provided in conjunction with the accompanying drawings. It should be noted that the embodiments described below are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0027] refer to Figure 1 and Figure 2 As shown, a surge arrester includes a base 1 and a surge arrester core 2; an insulating sleeve 3 is fixedly installed on the base 1, and a terminal cover 4 is installed at the other end of the insulating sleeve 3; the surge arrester core 2 is installed inside the insulating sleeve 3, and both ends of the surge arrester core 2 are respectively pressed against the terminal cover 4 and the base 1; a vulcanized silicone rubber umbrella sleeve 5 is provided outside the insulating sleeve 3, and both ends of the vulcanized silicone rubber umbrella sleeve 5 extend in opposite directions until they abut against the terminal cover 4 and the base 1 respectively.

[0028] The double insulation design of the insulating sleeve 3 and the vulcanized silicone rubber shed 5 effectively prevents current leakage and short circuits, ensuring the stable operation of the surge arrester in harsh environments. Simultaneously, the vulcanized silicone rubber shed 5 possesses excellent weather resistance and anti-aging properties, providing good protection for the surge arrester core 2 and extending the service life of the surge arrester. The surge arrester core 2 is installed using a crimping method, ensuring a good electrical connection between the surge arrester core 2 and the terminal cover 4 and base 1, which helps the surge arrester respond quickly to overvoltages and effectively protect the equipment.

[0029] Specifically, refer to Figure 2 and Figure 3 As shown, the surge arrester core 2 is wrapped with alkali-free glass fiber tape 6. The alkali-free glass fiber tape 6 has excellent electrical insulation and arc resistance, further isolating the surge arrester core 2 from the external environment, reducing the risk of partial discharge, and improving the insulation reliability of the surge arrester in high-voltage or complex electric field environments. Simultaneously, the alkali-free glass fiber tape 6 has good thermal conductivity, which can assist in heat dissipation of the surge arrester core 2, preventing localized overheating that could lead to material aging or performance degradation, and extending the service life of the surge arrester.

[0030] A heat dissipation interlayer 7 is further provided between the insulating sleeve 3 and the alkali-free glass ribbon 6. The heat dissipation interlayer 7 includes a heat dissipation layer 71 disposed on the outside of the alkali-free glass ribbon 6. The heat dissipation layer 71 has a plurality of heat dissipation strips 72 arranged along the length direction of the surge arrester core 2 on the side near the alkali-free glass ribbon 6. The heat dissipation strips 72 abut against the alkali-free glass ribbon 6 and form a heat dissipation cavity 8 between the heat dissipation layer 71 and the alkali-free glass ribbon 6. The heat dissipation layer 71 is provided with a plurality of heat dissipation channels 9, and the heat dissipation channels 9 communicate with the heat dissipation cavity 8. In this embodiment, the heat dissipation strips 72 are arranged at equal intervals along the inner circumferential direction of the heat dissipation layer 71.

[0031] By providing basic heat conduction through the heat dissipation layer 71, and with the heat dissipation strip 72 extending along the length of the surge arrester core 2 to form a longitudinal heat conduction path, the heat inside the surge arrester core 2 can be quickly conducted to the heat dissipation strip 72 via the alkali-free glass ribbon 6, and then to the heat dissipation layer 71. Simultaneously, the heat dissipation cavity 8 further expands the heat dissipation area and improves heat dissipation performance. Furthermore, the heat in the heat dissipation cavity can be dissipated through the heat dissipation channel 9, allowing the internal heat to be quickly dissipated to the external environment, further improving heat dissipation efficiency.

[0032] refer to Figure 3 , Figure 4 and Figure 6As shown, the vulcanized silicone rubber umbrella cover 5 includes an umbrella cover body 51 and a plurality of skirt-shaped protrusions 52 spaced apart along the length of the umbrella cover body 51. Each skirt-shaped protrusion 52 has a heat dissipation hole at its bottom 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 communicates with the corresponding heat dissipation hole. In this embodiment, a rubber filter screen for dust prevention is provided on the heat dissipation hole to prevent external impurities and dust from entering and clogging the heat dissipation hole.

[0033] The heat dissipation channel 9 passes through the insulating sleeve 3 and the vulcanized silicone rubber shed 5, and connects with the heat dissipation holes on the skirt-shaped protrusion 52. This allows a portion of the heat generated by the surge arrester core to pass sequentially through the alkali-free glass ribbon 6, the heat dissipation cavity 8, and the heat dissipation channel 9, and finally dissipate through the heat dissipation holes, significantly shortening the heat transfer distance and effectively improving heat dissipation efficiency. Another portion of the heat is conducted to the outside through the alkali-free glass ribbon 6, the heat dissipation layer 7, the insulating sleeve 3, and the vulcanized silicone rubber shed 5. Thus, through multiple heat conduction paths, the efficient conduction of heat inside the surge arrester is achieved, allowing the internal heat to be quickly dissipated to the external environment. This effectively reduces the rate of temperature change during surge arrester operation, preventing the insulation performance degradation caused by the thermal aging of the vulcanized silicone rubber shed 5 and the insulating sleeve 3 due to prolonged high temperatures. This ensures the performance stability of the surge arrester core 2, thereby greatly extending the service life of the surge arrester, reducing operating costs, and improving safety.

[0034] Among them, reference Figure 4 , Figure 6 As shown, the base 1 includes a body 101, the center of which is recessed to form a cylindrical support groove 102. The inner sidewall of the cylindrical support groove 102 is provided with a first internal thread 103 along the circumference. The outer surface of the insulating sleeve 3 near the body 101 is provided with a first external thread 31 that matches the first internal thread 103. The insulating sleeve 3 is housed in the cylindrical support groove 102 and is threadedly connected to the first internal thread 103 through the first external thread 31.

[0035] The insulating sleeve 3 is provided with a first groove on the outer periphery of the side near the seat 101. The first groove is located above the first external thread 31. A first sealing ring 32 is provided in the first groove. The insulating sleeve 2 is threadedly connected to the cylindrical support groove 102, so that the first sealing ring 32 is in tight contact with the inner side of the cylindrical support groove 102.

[0036] In practical use, after the surge arrester core 2 is installed inside the insulating sleeve 3, the end of the insulating sleeve 3 near the base 101 is inserted into the cylindrical support groove 102, so that the first internal thread 103 matches the first external thread 31 and begins to rotate. Finally, the insulating sleeve 3 is fixedly connected to the base 1, and the surge arrester core 2 is pressed against the base 1. At this time, the first sealing ring 32 is in tight contact with the inner side of the cylindrical support groove 102, thereby sealing the gap between the insulating sleeve 3 and the base 1, thus achieving waterproof and dustproof function, and effectively preventing external environment from corroding or damaging the inside of the surge arrester. The detachable design of the insulating sleeve 3 and the base 1 makes it convenient for users to disassemble and install the surge arrester, which helps to improve the efficiency of maintenance and replacement of surge arrester parts.

[0037] The surge arrester core 2 includes an upper electrode 21, a resistor assembly, a conductive connecting block 22, an insulating pad 23, and a lower electrode 24, which are sequentially stacked in series along the direction close to the base 1, and the conductive connecting block 242 is provided with a grounding bolt 10.

[0038] The resistor assembly includes several resistor valve groups, with adjacent resistor valve groups connected in series via a spacer 25. Each resistor valve group includes several resistor valves 26 connected in series, each resistor valve comprising a zinc oxide resistor valve and a hydrophobic layer on its outer surface. The zinc oxide resistor valve exhibits excellent nonlinear current-voltage characteristics, displaying high resistance under normal operating voltage and rapidly conducting and discharging current during overvoltage, effectively limiting the overvoltage amplitude. The hydrophobic coating design forms a hydrophobic barrier on the outside of the zinc oxide resistor valve, effectively preventing surface leakage and flashover caused by humid environments.

[0039] 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 pad 23 is a polytetrafluoroethylene pad.

[0040] refer to Figure 2 , Figure 3 As shown, the terminal cover 4 includes an end cover 41 and a terminal 42 disposed on the end cover 41. The terminal 42 is pressed against one end of the surge arrester core 2. The inner circumferential side of the open end of the end cover 41 is provided with a second internal thread 43. The outer circumferential side of the insulating sleeve 3 near the opening of one end of the terminal cover 4 is provided with a second external thread 33 that matches the second internal thread 43. The end cover 41 is sleeved on the outside of the insulating sleeve 3 and is threadedly connected to the second external thread 33 through the second internal thread 43.

[0041] The insulating sleeve 3 is provided with a second groove on the outer periphery of the side near the terminal cover 4. The second groove is located above the second external thread 33. A second sealing ring 34 is provided in the second groove. The end cover 41 is threadedly connected to the insulating sleeve 3, so that the second sealing ring 34 is in tight contact with the inner side of the end cover 41.

[0042] In practical use, the end cap 41 is fitted onto the outer side of the insulating sleeve 3 near the terminal cap 4, so that the second internal thread 43 matches the second external thread 33 and begins to rotate. Finally, the end cap 41 and the insulating sleeve 3 are fixedly connected. At this time, the terminal 42 is pressed and connected to one end of the surge arrester core 2, and the second sealing ring 34 is in tight contact with the inner side of the end cap 41, thereby sealing the gap between the insulating sleeve 3 and the terminal cap 4, thus achieving the function of waterproofing and dustproofing. The detachable design of the insulating sleeve 3 and the terminal cap 4 facilitates the user's disassembly and assembly of the surge arrester, which helps to improve the efficiency of maintenance and replacement of surge arrester components.

[0043] refer to Figure 5 As shown, the bottom center of the base 1 is recessed inward to form a buffer cavity 104, and a number of mounting holes 105 are provided on the outer side of the center of the base 1.

[0044] The buffer cavity 104 absorbs external impact energy through structural deformation, preventing stress from being directly transmitted to the arrester core 2 and significantly reducing the risk of damage to the arrester core 2. The mounting hole 105 allows the arrester to be installed in a preset position.

[0045] This utility model provides a surge arrester with good heat dissipation and insulation performance, and is easy to assemble and disassemble with a long service life.

[0046] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model and do not limit the utility model to the specific implementations described. Obviously, other modifications and variations can be made based on the content of this specification. The embodiments selected and specifically described in this specification are intended to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. They are not intended to limit the utility model, and any simple modifications to this utility model fall within the protection scope of this utility model.

Claims

1. A surge arrester, characterized by, The device includes a base and a surge arrester core. An insulating sleeve is fixedly installed on the base, and a terminal cover is installed at the other end of the insulating sleeve. The surge arrester core is installed inside the insulating sleeve, and both ends of the surge arrester core are respectively pressed against the terminal cover and the base. A vulcanized silicone rubber umbrella sleeve is provided outside the insulating sleeve, and both ends of the vulcanized silicone rubber umbrella sleeve extend in opposite directions until they abut against the terminal cover and the base, respectively. The surge arrester core is wrapped with an alkali-free glass fiber tape, and a heat dissipation interlayer is provided between the insulating sleeve and the alkali-free glass fiber tape. The heat dissipation interlayer includes a heat dissipation layer disposed on the outside of the alkali-free glass fiber tape. The heat dissipation layer has several heat dissipation strips arranged along the length of the surge arrester core on the side close to the alkali-free glass fiber tape. The heat dissipation strips abut against the alkali-free glass fiber tape and form a heat dissipation cavity between the heat dissipation layer and the alkali-free glass fiber tape. The heat dissipation layer has several heat dissipation channels, 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 spaced apart along the length of the umbrella cover body. The bottom of each skirt-shaped protrusion has a heat dissipation hole that matches the heat dissipation channel. The heat dissipation channel passes through the insulating sleeve and the vulcanized silicone rubber umbrella cover and communicates with the corresponding heat dissipation hole.

2. The surge arrester of claim 1, wherein The surge arrester core includes an upper electrode, a resistor assembly, a conductive connecting block, an insulating pad, and a lower electrode, which are sequentially stacked in series along the direction close to the base, and a grounding bolt is provided on the conductive connecting block.

3. The surge arrester of claim 2, wherein The resistor assembly includes several resistor valve groups, and adjacent resistor valve groups are stacked in series through a pad.

4. The surge arrester of claim 3, wherein The resistor valve assembly includes several resistor valves stacked in series, each resistor valve including a zinc oxide resistor valve and a hydrophobic layer disposed on the outer surface of the zinc oxide resistor valve.

5. The surge arrester of claim 1, wherein A rubber filter for dust prevention is provided on the heat dissipation hole.

6. The surge arrester of claim 1, wherein The base includes a body, the center of which is recessed to form a cylindrical support groove. The inner sidewall of the cylindrical support groove is provided with a first internal thread along the circumference. The outer surface of the insulating sleeve near the body is provided with a first external thread that matches the first internal thread. The insulating sleeve is housed in the cylindrical support groove and is threadedly connected to the first internal thread through the first external thread.

7. A surge arrester according to claim 6, characterized in that, The insulating sleeve is also provided with a first groove on the outer periphery near the seat body. The first groove is located above the first external thread. A first sealing ring is provided in the first groove. The insulating sleeve is threadedly connected to the cylindrical support groove, so that the first sealing ring is in tight contact with the inner side of the cylindrical support groove.

8. The surge arrester of claim 1, wherein, The terminal cover includes an end cover and a terminal provided on the end cover. The terminal is pressed against one end of the surge arrester core. The inner circumference of the open end of the end cover is provided with a second internal thread. The outer circumference of the insulating sleeve near the opening of one end of the terminal cover is provided with a second external thread that matches the second internal thread. 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.

9. The surge arrester of claim 8, wherein, The insulating sleeve is further provided with a second groove on the outer periphery near the terminal cover. The second groove is located above the second external thread. A second sealing ring is provided in the second groove. The terminal cover is threadedly connected to the insulating sleeve, so that the second sealing ring is in tight contact with the inner side of the terminal cover.

10. The surge arrester of claim 1, wherein The bottom center of the base is recessed inward to form a buffer cavity, and several mounting holes are provided on the outer side of the center of the base.

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