An explosion-proof surge arrester

Abstract

This utility model provides an explosion-proof surge arrester. Through the inclusion of explosion-proof components and a pressure relief port, high-pressure gas generated during an internal fault in the arrester core can be released through the pressure relief port and simultaneously enter the pressure relief chamber through the gap. This pushes the sliding stop away from the air inlet of the outlet channel, allowing the high-pressure gas to be immediately discharged at high speed through the exposed air inlet of the outlet channel. This achieves internal pressure relief of the surge arrester, effectively preventing violent explosions or physical cracks on the outer surface caused by excessive internal pressure accumulation, significantly improving safety performance. Simultaneously, the heat dissipation cavity and wave-shaped heat sink allow for rapid dissipation of internal heat to the external environment, achieving efficient heat conduction and further improving the arrester's heat dissipation efficiency, effectively extending its service life and enhancing operational safety.

Description

Technical Field

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

[0002] In power systems, surge arresters are key devices for limiting operational overvoltages and lightning overvoltages, protecting electrical equipment from damage caused by lightning overvoltages, operational overvoltages, and power frequency transient overvoltages.

[0003] Some existing surge arresters only use silicone rubber sealing structures, which have inherent defects in their explosion-proof capabilities. When encountering multiple lightning strikes or severe power frequency follow current, the internal resistor valve may thermally collapse, leading to a rapid expansion of gas and the formation of ultra-high pressure inside the sealed housing. Because the existing surge arrester housing structure has a low pressure bearing limit and lacks a reliable pressure release mechanism, it is very easy to cause violent rupture, resulting in the housing exploding and causing major safety hazards.

[0004] Therefore, in order to improve the safety of surge arresters, it is necessary to provide a surge arrester with explosion protection. Utility Model Content

[0005] Based on the necessity of explosion-proof safety of surge arresters in the existing technology, this utility model provides an explosion-proof surge arrester.

[0006] An explosion-proof surge arrester includes an arrester body and an explosion-proof component. The arrester body includes a silicone awning, a high-strength insulating bushing, and an arrester core. The silicone awning is fitted over the high-strength insulating bushing, forming a heat dissipation cavity between them. The heat dissipation cavity contains several connecting blocks whose two ends are respectively connected to the silicone awning and the high-strength insulating bushing. The high-strength insulating bushing has several pressure relief holes for releasing internal pressure, and a mounting cavity is provided inside the high-strength insulating bushing. The arrester core is mounted inside the mounting cavity, and a gap is formed between the arrester core and the inner wall of the mounting cavity. A pressure relief cavity communicating with the gap is formed between the arrester core and the bottom of the mounting cavity. A high-voltage screw and a grounding screw are respectively connected to both ends of the arrester core. The screw and grounding screw extend through the high-strength insulating sleeve and silicone umbrella sleeve to the outside. The explosion-proof component includes a sliding stop and a compression spring disposed in the pressure relief chamber. The sliding stop and the compression spring are slidably sleeved on the grounding screw, and the outer periphery of the sliding stop is slidably connected to the inner wall of the pressure relief chamber. One end of the compression spring is connected to the sliding stop, and the other end is connected to the bottom of the pressure relief chamber. Several air outlet channels are opened on the periphery of the pressure relief chamber, which penetrate the high-strength insulating sleeve and silicone umbrella sleeve and communicate with the outside. The air outlet channels are arranged obliquely downward, and the air outlet of the air outlet channel is provided with a filter plug for dust prevention. When the compression spring is in the extended state, the sliding stop blocks the air inlet of the air outlet channel. When the compression spring is in the compressed state, the sliding stop moves away from the air inlet of the air outlet channel.

[0007] Furthermore, the heat dissipation cavity is also provided with several wave-shaped heat dissipation fins, and the two ends of the wave-shaped heat dissipation fins abut against the silicone umbrella sleeve and the high-strength insulating sleeve, respectively.

[0008] Furthermore, the pressure relief hole is either a through hole penetrating the high-strength insulating sleeve or a blind hole provided on the high-strength insulating sleeve.

[0009] Furthermore, the inner side of the high-strength insulating sleeve is provided with several spiral air guide grooves.

[0010] Furthermore, a support frame is fixedly provided on the grounding screw, and the surge arrester core is located on the support frame.

[0011] Furthermore, an elastic sealing ring is slidably connected to the grounding screw. The elastic sealing ring is located above the sliding block, and when the compression spring is in the extended state, the elastic sealing ring is compressed and deformed by the sliding block, thus sealing the gap.

[0012] Furthermore, the surge arrester core includes a zinc oxide resistor and a high-voltage electrode and a grounding electrode disposed at both ends of the zinc oxide resistor along its length. The high-voltage electrode and the grounding electrode are respectively connected to the high-voltage screw and the grounding screw at their respective ends.

[0013] Furthermore, the zinc oxide resistor includes several resistor valve groups, and adjacent resistor valve groups are stacked in series through a pad.

[0014] Furthermore, the surge arrester core is wrapped with alkali-free glass fiber ribbon.

[0015] Furthermore, an air outlet pipe is embedded in the air outlet channel, and a hydrophobic coating is provided on the inner side of the air outlet pipe.

[0016] The beneficial effects of this utility model are as follows: The explosion-proof surge arrester provided by this utility model, through the setting of explosion-proof components and pressure relief holes, allows high-pressure gas generated by internal faults in the surge arrester core to be released through the pressure relief holes on the one hand, and to flow into the pressure relief chamber through the gap on the other hand. This pushes the sliding block away from the air inlet of the outlet channel, allowing the high-pressure gas to be immediately discharged at high speed through the exposed air inlet of the outlet channel, thereby achieving internal pressure relief of the surge arrester. This effectively prevents the surge arrester from violently exploding or physically cracking its outer surface due to excessive internal pressure accumulation, significantly improving safety performance. At the same time, through the setting of heat dissipation chamber and wave heat sink, internal heat can be quickly dissipated to the external environment, achieving efficient heat conduction within the surge arrester, further improving the heat dissipation efficiency of the surge arrester, effectively extending the service life of the surge arrester, and improving the safety of use. Attached Figure Description

[0017] Figure 1 A structural schematic diagram of an explosion-proof surge arrester provided by this utility model;

[0018] Figure 2 A cross-sectional structural diagram of an explosion-proof surge arrester provided by this utility model;

[0019] Figure 3 for Figure 2 A magnified structural diagram of part A.

[0020] Attached Figure Labels

[0021] 1. Silicone umbrella sleeve; 2. High-strength insulating sleeve; 21. Mounting cavity; 22. Gap; 23. Pressure relief cavity; 3. Surge arrester core; 31. Zinc oxide resistor; 32. High voltage electrode; 33. Grounding electrode; 4. Heat dissipation cavity; 5. Connecting block; 6. Corrugated heat sink; 7. Pressure relief hole; 8. High voltage screw; 9. Grounding screw; 10. Sliding stop; 11. Compression spring; 12. Support bracket; 13. Vent channel; 14. Filter plug; 15. Vent pipe; 16. Elastic sealing ring. Detailed Implementation

[0022] 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.

[0023] refer to Figure 1 and Figure 2 As shown, an explosion-proof surge arrester includes a surge arrester body and an explosion-proof component. The surge arrester body includes a silicone umbrella sleeve 1, a high-strength insulating sleeve 2, and a surge arrester core 3.

[0024] Specifically, refer to Figure 2 and Figure 3 As shown, the silicone umbrella sleeve 1 is fitted over the outside of the high-strength insulating sleeve 2, forming a heat dissipation cavity 4 between them. The heat dissipation cavity 4 contains several connecting blocks 5, both ends of which are connected to the silicone umbrella sleeve and the high-strength insulating sleeve 2 respectively. The heat dissipation cavity 4 also contains several corrugated heat dissipation fins 6, with both ends of the corrugated heat dissipation fins abutting against the silicone umbrella sleeve 1 and the high-strength insulating sleeve 2 respectively.

[0025] By increasing the heat dissipation area through the heat dissipation cavity 4, the efficiency of heat dissipation from the surge arrester core 3 to the outside environment can be improved, thus enhancing heat dissipation performance. Simultaneously, the heat dissipation cavity 4 also provides a certain pressure relief space for the high-strength insulating bushing 1 to release internal pressure. Furthermore, the corrugated heat sink 6 further improves heat dissipation efficiency, enabling rapid dissipation of internal heat to the external environment. This achieves efficient heat conduction within the surge arrester, effectively reducing the rate of temperature change during operation. It prevents the thermal aging of the silicone rubber shed 1 and the high-strength insulating bushing 2 caused by prolonged high temperatures, thus avoiding a decline in insulation performance. This ensures the performance stability of the surge arrester core 3, thereby extending the service life of the surge arrester and improving operational safety.

[0026] The high-strength insulating sleeve 2 is provided with several pressure relief holes 7 for releasing the internal pressure of the high-strength insulating sleeve 2. In this embodiment, the pressure relief hole 7 is either a through hole penetrating the high-strength insulating sleeve 2 or a blind hole provided on the high-strength insulating sleeve 2. A blind hole is not a through hole, but a closed countersunk hole with a depth. The depth of the blind hole is adjusted according to the voltage level in actual use.

[0027] By setting the pressure relief hole 7, the internal energy of the high-strength insulating bushing 2 can be released in time, and the pressure can be released as quickly as possible to ensure the pressure balance inside the surge arrester. This prevents the high-strength insulating bushing 2 from bursting due to overpressure, enhances the explosion-proof performance of the high-strength insulating bushing 5, avoids catastrophic explosion accidents, and improves the safety of use.

[0028] The high-strength insulating sleeve 2 has an installation cavity 21. The surge arrester core 3 is installed inside the installation cavity 21, and a gap 22 is formed between the surge arrester core 3 and the inner wall of the installation cavity 21. A pressure relief cavity 23 connected to the gap 22 is formed between the surge arrester core 3 and the bottom of the installation cavity 21. A high-voltage screw 8 and a grounding screw 9 are respectively connected to both ends of the surge arrester core 2, and the high-voltage screw 8 and the grounding screw 9 extend through the high-strength insulating sleeve 2 and the silicone umbrella sleeve 1 to the outside.

[0029] The surge arrester core 2 is wrapped with alkali-free glass fiber tape (not shown in the figure). The surge arrester core 3 includes a zinc oxide resistor 31 and a high-voltage electrode 32 and a grounding electrode 33 disposed at both ends of the zinc oxide resistor 31 along its length. The high-voltage electrode 32 and the grounding electrode 33 are respectively connected to the high-voltage screw 8 and the grounding screw 9 at their ends. The zinc oxide resistor 31 includes several resistor valve groups (not shown in the figure), and adjacent resistor valve groups are stacked in series through a spacer block (not shown in the figure).

[0030] Alkali-free glass fiber reinforced plastic (GFRP) wire possesses 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 GFRP wire has good thermal conductivity, aiding in heat dissipation of the surge arrester core 2, preventing localized overheating that could lead to material aging or performance degradation, and extending the surge arrester's service life. The zinc oxide resistor 31 exhibits excellent nonlinear volt-ampere characteristics, displaying high resistance under normal operating voltage and rapidly conducting discharge current during overvoltage, effectively limiting the overvoltage amplitude.

[0031] The explosion-proof component includes a sliding stop 10 and a compression spring 11 disposed within the pressure relief chamber. Both the sliding stop 10 and the compression spring 11 are slidably sleeved on the grounding screw 9, and the outer periphery of the sliding stop 10 is slidably connected to the inner wall of the pressure relief chamber 23. In practical use, grooves can be provided on both sides of the inner wall of the pressure relief chamber 23, allowing the two ends of the sliding block 10 to be slidably connected to the grooves. One end of the compression spring 11 is connected to the sliding stop 10, and the other end is connected to the bottom of the pressure relief chamber 23. A support bracket 12 is also fixedly mounted on the grounding screw 9, and the surge arrester core 2 is located on the support bracket 12. In practical use, the grounding screw 9 has a smooth inner surface and threads on its outer surface.

[0032] The pressure relief chamber 23 has several air outlet channels 13 that penetrate the high-strength insulating sleeve 2 and the silicone umbrella sleeve 1 and communicate with the outside. The air outlet channels 13 are angled downwards, and each air outlet is equipped with a dust filter plug 14. The filter plug 14 effectively prevents external dust and impurities from entering the high-strength insulating sleeve 2. The angled air outlet channels 13 form a gravity barrier against incoming moisture, preventing it from entering. When the compression spring 11 is in the extended state, the sliding stop 10 blocks the air inlet of the air outlet channel 13; when the compression spring 11 is in the compressed state, the sliding stop 10 blocks the air inlet of the air outlet channel 13.

[0033] The working principle of the explosion-proof component provided by this utility model is as follows: When the arrester core 2 experiences an internal fault (such as severe overload or explosion), a large amount of high-temperature, high-pressure gas will expand instantaneously. The high-pressure gas can be released through the pressure relief hole 7 on one hand, and simultaneously flow into the pressure relief chamber 23 through the gap 22 on the other. The rapidly increasing gas pressure in the pressure relief chamber 23 acts on the top surface of the sliding block 23, providing downward pressure to the sliding block 23, causing it to slide downwards along the grounding screw 9 and against the wall of the pressure relief chamber 23, compressing the compression spring 11. The sliding block 23 gradually moves away from the air inlet of the outlet channel 13, exposing the air inlet of the outlet channel 13. At this time, the high-pressure gas is immediately discharged at high speed through the outlet channel 13, thereby achieving internal pressure relief of the arrester. This effectively prevents the arrester from violently exploding or physically cracking its outer surface due to excessive internal pressure accumulation, significantly improving safety performance.

[0034] After the high-pressure gas inside the surge arrester core 2 is discharged, the pressure on the top surface of the sliding block 23 disappears, and the compression spring 11 returns to its original extended state. At this time, under the action of the extension force of the compression spring 11, the sliding block 10 slides upward along the grounding screw 9 and on the cavity wall of the pressure release chamber 23, sliding back to its original position and blocking the air inlet of the air outlet channel 13.

[0035] In this embodiment, the inner side of the high-strength insulating sleeve 2 is provided with several spiral gas guide grooves (not shown in the figure). The spiral structure can guide the gas to flow along the direction of the grooves, increase the gas flow rate, and make it eventually converge to the preset pressure release hole 7 or the gas outlet channel 13 for release, thereby improving the release efficiency of high-pressure gas.

[0036] refer to Figure 3 As shown, preferably, an outlet pipe 15 is embedded within the outlet channel 13, and the inner side of the outlet pipe 15 is provided with a hydrophobic coating (not shown in the figure). The arrangement of the outlet pipe 15 can prevent the outlet channel 13 from deforming and affecting the normal pressure relief, ensuring the stability of pressure release under long-term use. The hydrophobic coating, together with the downwardly oriented outlet channel 13, makes it difficult for external moisture to enter the surge arrester through the outlet pipe 15, thus preventing external moisture from affecting the performance of the surge arrester.

[0037] refer to Figure 3 As shown, preferably, an elastic sealing ring 16 is also slidably connected to the grounding screw 9. The elastic sealing ring 16 is located above the sliding block 10, and when the compression spring 11 is in the extended state, the elastic sealing ring 16 is compressed and deformed by the sliding block 10, and seals the gap 22.

[0038] By setting the elastic sealing ring 16, under the normal operating state of the surge arrester, when there is no high-pressure gas pressing the sliding block 10 to slide downward on the inner wall of the pressure relief chamber 23 and squeeze the compression spring 11 to contract, the compression spring 11 is in the extended state. The elastic sealing ring 16 is located between the sliding block 10 and the support frame 12. The upward extension force provided by the extended compression spring 11 compresses the elastic sealing ring 16, causing it to deform and increase in area until it abuts against the inner wall of the pressure relief chamber 23, sealing the gap 22. Thus, the pressure release can be controlled by whether the elastic sealing ring 16 is deformed.

[0039] This utility model provides an explosion-proof surge arrester. Through the setting of explosion-proof components and pressure relief hole 7, the high-pressure gas generated by an internal fault in the surge arrester core can be released through the pressure relief hole on the one hand, and enter the pressure relief chamber through the gap on the other hand. This pushes the sliding block away from the air inlet of the outlet channel, so that the high-pressure gas is immediately discharged at high speed through the exposed air inlet of the outlet channel, thereby realizing the internal pressure relief of the surge arrester. This effectively prevents the surge arrester from violently exploding or physically cracking its outer surface due to excessive internal pressure accumulation, and significantly improves safety performance.

[0040] 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. An explosion-proof surge arrester, comprising an arrester body and an explosion-proof component, wherein the arrester body comprises a silicone shed, a high-strength insulating sleeve, and an arrester core, characterized in that, The silicone umbrella sleeve is fitted on the outside of the high-strength insulating sleeve, and a heat dissipation cavity is formed between the silicone umbrella sleeve and the high-strength insulating sleeve; the heat dissipation cavity is provided with a plurality of connecting blocks whose two ends are respectively connected to the silicone umbrella sleeve and the high-strength insulating sleeve. The high-strength insulating bushing is provided with several pressure relief holes for releasing the pressure inside the high-strength insulating bushing, and an installation cavity is provided inside the high-strength insulating bushing. The surge arrester core is installed inside the installation cavity, and a gap is formed between the surge arrester core and the inner wall of the installation cavity. A pressure relief cavity connected to the gap is formed between the surge arrester core and the bottom of the installation cavity. The surge arrester core is connected to a high-voltage screw and a grounding screw at both ends, and the high-voltage screw and the grounding screw extend through the high-strength insulating sleeve and the silicone umbrella sleeve to the outside. The explosion-proof component includes a sliding block and a compression spring disposed in the pressure relief chamber. The sliding block and the compression spring are both slidably sleeved on the grounding screw. The outer periphery of the sliding block is slidably connected to the inner wall of the pressure relief chamber. One end of the compression spring is connected to the sliding block, and the other end is connected to the bottom of the pressure relief chamber. The pressure relief chamber has several air outlet channels that pass through the high-strength insulating sleeve and silicone umbrella sleeve and are connected to the outside. The air outlet channels are arranged obliquely downwards, and the air outlet of the air outlet channel is provided with a filter plug for dust prevention. When the compression spring is in the extended state, the sliding block blocks the air inlet of the air outlet channel; when the compression spring is in the compressed state, the sliding block moves away from the air inlet of the air outlet channel.

2. The explosion-proof surge arrester according to claim 1, characterized in that, The heat dissipation cavity is also provided with several wave-shaped heat dissipation fins, and the two ends of the wave-shaped heat dissipation fins abut against the silicone umbrella sleeve and the high-strength insulating sleeve, respectively.

3. The explosion-proof surge arrester according to claim 1, characterized in that, The pressure relief hole is either a through hole penetrating the high-strength insulating sleeve or a blind hole provided on the high-strength insulating sleeve.

4. The explosion-proof surge arrester according to claim 1, characterized in that, The inner side of the high-strength insulating sleeve is provided with several spiral air guide grooves.

5. The explosion-proof surge arrester according to claim 1, characterized in that, A support frame is also fixed on the grounding screw, and the surge arrester core is located on the support frame.

6. The explosion-proof surge arrester according to claim 1, characterized in that, An elastic sealing ring is also slidably connected to the grounding screw. The elastic sealing ring is located above the sliding block. When the compression spring is in the extended state, the elastic sealing ring is compressed and deformed by the sliding block and seals the gap.

7. The explosion-proof surge arrester according to claim 1, characterized in that, The surge arrester core includes a zinc oxide resistor and a high-voltage electrode and a grounding electrode disposed at both ends of the zinc oxide resistor along its length. The high-voltage electrode and the grounding electrode are respectively connected to the high-voltage screw and the grounding screw at their respective ends.

8. The explosion-proof surge arrester according to claim 7, characterized in that, The zinc oxide resistor includes several resistor valve groups, and adjacent resistor valve groups are stacked in series through a pad.

9. The explosion-proof surge arrester according to claim 1, characterized in that, The surge arrester core is wrapped with alkali-free glass ribbon.

10. The explosion-proof surge arrester according to claim 1, characterized in that, An air outlet pipe is embedded in the air outlet channel, and the inner side of the air outlet pipe is coated with a hydrophobic coating.

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