Lightning arrester and gap dual-component glue sealing method

Abstract

The application relates to the field of lightning arresters, and discloses a lightning arrester which comprises a core body, a winding type insulating cylinder, a first locking electrode, a second locking electrode, a silica gel umbrella type outer cover, a first sealed positioning electrode and a second sealed positioning electrode. The core body is positioned through the first sealed positioning electrode and the second sealed positioning electrode. V-shaped sealing grooves are arranged on the first sealed positioning electrode and the second sealed positioning electrode, and the first sealed positioning electrode and the second sealed positioning electrode are sealed and connected with the core body through a heat shrink process after being coated with sealing glue. The winding type insulating cylinder is used for covering the core body, and the winding type insulating cylinder is filled with two-component sealing glue. Through the sealing connection of the first sealed positioning electrode, the second sealed positioning electrode and the sealing glue, the invasion of moisture and pollutants can be effectively prevented, and the residual air and air bubbles can be removed through the synergistic effect of the glue injection port and the suction port, so that the sealing glue is uniformly distributed in the winding type insulating cylinder, and the sealing performance is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of surge arrester technology, specifically to a surge arrester and a two-component potting and sealing method for the gap. Background Technology

[0002] Currently, surge arresters are a key protection device widely used in power systems. Their main function is to limit overvoltage amplitude and protect power equipment from damage caused by lightning and switching overvoltages.

[0003] To prevent moisture absorption of the internal core assembly during manufacturing, epoxy resin is typically injected into the surge arrester to encapsulate it. Evacuation vents are provided on the electrodes at both ends of the arrester for resin injection and venting. These vents are then sealed with sealants after injection. However, this resin injection process is difficult to control, easily leading to the formation of numerous air bubbles within the epoxy resin. These bubbles often fail to dissipate completely within the specified time, potentially causing varying degrees of partial discharge effects over long-term use. Furthermore, if the vents are not properly sealed, they can become entry points for moisture, posing a potential safety hazard to the arrester's operation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a surge arrester and a two-component potting and sealing method for the gap, which solves the problems of insufficient sealing performance, poor mechanical stability, and low insulation reliability of traditional surge arresters.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a surge arrester, comprising a core, a wound insulating cylinder, a first locking electrode, a second locking electrode, a silicone umbrella-shaped outer sleeve, a first sealed positioning electrode, and a second sealed positioning electrode. The core is positioned by the first and second sealed positioning electrodes. The first and second sealed positioning electrodes are provided with V-shaped sealing grooves and are sealed to the core by heat shrinking after being coated with sealant. The wound insulating cylinder is used to cover the core and is filled with two-component sealant. Its two ends are sealed to each other by the first and second locking electrodes. The outer walls of the first and second locking electrodes are provided with trapezoidal threads and their surfaces are coated with sealing grease.

[0006] The silicone umbrella-shaped outer jacket is vulcanized and then integrally connected to the wound insulating cylinder to form an external sealed protection.

[0007] Preferably, an annular sealing groove is provided on one side of the first locking electrode and the second locking electrode, and an overflow groove is provided on the outer wall for sealing the connection of the spiral insulating cylinder and discharging excess sealant.

[0008] Preferably, the first locking electrode and the second locking electrode each have an injection port and a suction port on opposite sides. The inner walls of the injection port and the suction port are each equipped with a sealing one-way valve to expel gas from the cylinder and prevent air backflow.

[0009] Preferably, an insulating component is installed between the core and the wound insulating cylinder to enhance the electrical insulation performance of the surge arrester and avoid the risk of breakdown under internal high voltage conditions.

[0010] Preferably, a preload spring is provided between the second sealed positioning electrode and the first locking electrode to apply axial pressure to the core to prevent structural loosening caused by long-term operation.

[0011] Preferably, the silicone umbrella-shaped outer cover is made of weather-resistant silicone material, which has the properties of moisture resistance, UV protection and mechanical impact resistance, and is integrally connected to the wound insulating cylinder through high-temperature vulcanization.

[0012] Preferably, the excess sealant groove is formed on the outer wall of the first locking electrode and the second locking electrode to facilitate the discharge of excess sealant.

[0013] Preferably, the injection port is connected to a vacuum negative pressure device for injecting two-component sealant, and the suction port is used to expel air from the cylinder.

[0014] Preferably, the surface of the wound insulating cylinder is uniformly coated with a vulcanizing agent to enhance its adhesion to the silicone umbrella-shaped outer jacket.

[0015] The two-component potting and sealing method for gaps includes the following steps:

[0016] The core is positioned by the first and second sealed positioning electrodes, and then sealed by heat shrinking after applying sealant.

[0017] The first locking electrode and the second locking electrode are respectively connected to the wound insulating cylinder, and axial pressure is applied to the core by a preload spring;

[0018] Two-component sealant is injected through the injection port under vacuum negative pressure to remove air from the cylinder and fill it evenly.

[0019] Use sealing nuts to seal the injection port and suction port;

[0020] A vulcanizing agent is applied to the spiral insulating cylinder and the silicone umbrella-shaped outer jacket, and then vulcanized at high temperature to form an integrated sealed structure.

[0021] This invention provides a surge arrester and a two-component potting and sealing method for the gap. It has the following beneficial effects:

[0022] 1. This invention achieves a high degree of sealing of the internal core structure through the V-shaped sealing groove design of the first and second sealed positioning electrodes, and the use of heat shrinking technology to seal the core after applying sealant. This effectively prevents the intrusion of moisture and contaminants. Combined with a vacuum negative pressure injection process using two-component sealant, the synergistic effect of the injection port and suction port eliminates residual air and bubbles, ensuring the sealant is evenly distributed inside the wound insulating cylinder. This significantly improves sealing performance and effectively prevents insulation defects or partial discharge caused by air bubbles.

[0023] 2. This invention utilizes a preload spring positioned between the second sealed positioning electrode and the core to apply stable axial pressure to the core during operation, preventing structural loosening or positional displacement due to thermal expansion, vibration, or long-term use, thereby improving the mechanical stability of the surge arrester. Simultaneously, the trapezoidal threaded first and second locking electrodes provide a secure connection through high-precision mechanical locking, further enhancing the device's seismic resistance.

[0024] 3. The design of the injection port and suction port in this invention allows the two-component sealant to be rapidly injected into the spiral wound insulating cylinder using a vacuum negative pressure device. Simultaneously, the suction port removes air and residual gas from the cylinder, forming a bubble-free, uniform sealant layer, significantly improving injection efficiency. The overflow groove prevents excess sealant from accumulating at the locking electrode position, avoiding uneven sealing and improving the reliability and production efficiency of the sealing process. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of the silicone umbrella-shaped outer casing of the present invention;

[0026] Figure 2 This is a schematic diagram of the first sealed positioning electrode structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the overflow groove structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the second sealed positioning electrode structure of the present invention;

[0029] Figure 5 This is a schematic diagram showing the installation of the overflow groove of the present invention on the second sealed positioning electrode;

[0030] Figure 6 This is a schematic diagram of the annular sealing groove structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the second locking electrode structure of the present invention;

[0032] Figure 8 This is a top view schematic diagram of the second locking electrode structure of the present invention;

[0033] Figure 9 This is a schematic diagram of the method steps of the present invention.

[0034] The components include: 1. Silicone umbrella-shaped outer sleeve; 2. Spiral wound insulating cylinder; 3. Two-component sealant; 4. Core; 5. First locking electrode; 6. Sealing nut; 7. Injection port; 8. Sealing one-way valve; 9. Preload spring; 10. Second sealing positioning electrode; 11. First sealing positioning electrode; 12. Insulating component; 13. Suction port; 14. Second locking electrode; 15. Overflow groove; 16. V-shaped sealing groove; 17. Annular sealing groove; 18. Trapezoidal thread. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] Please see the appendix Figure 2 -Appendix Figure 4 This invention provides a surge arrester, comprising a core 4, a wound insulating cylinder 2, a first locking electrode 5, a second locking electrode 14, a silicone umbrella-shaped outer sleeve 1, a first sealed positioning electrode 11, and a second sealed positioning electrode 10. The core 4 is positioned by the first sealed positioning electrode 11 and the second sealed positioning electrode 10. The first sealed positioning electrode 11 and the second sealed positioning electrode 10 are provided with V-shaped sealing grooves 16, and after being coated with sealant, they are sealed to the core 4 by a heat shrink process. A preload spring 9 is provided between the second sealed positioning electrode 10 and the first locking electrode 5 to apply axial pressure to the core 4 to prevent structural loosening caused by long-term operation.

[0037] Specifically, the core 4 is positioned by a first sealed positioning electrode 11 and a second sealed positioning electrode 10. The connecting surface of the first sealed positioning electrode 11 has a V-shaped sealing groove 16, which accommodates sealant. After the positioning electrodes are assembled, the sealant is evenly applied into the sealing groove and then, through a heat-shrink process, shrinks under heat to tightly adhere to the surface of the core 4, forming a highly reliable sealing structure that effectively prevents moisture intrusion and seal failure. The positioning end of the second sealed positioning electrode 10 is fitted to the bottom surface of the core 4, ensuring a stable connection between the core 4 and the positioning electrode through high-precision fitting. Simultaneously, a preload spring 9 is installed between the second sealed positioning electrode 10 and the first locking electrode 5. The preload spring 9 applies axial force to maintain a constant pressure on the core 4, thereby preventing structural loosening or positional displacement caused by vibration, thermal expansion, and other factors during long-term use, ensuring the safety and stability of the surge arrester operation.

[0038] Please see the appendix Figure 5 The inner cavity of the wound insulating cylinder 2 is covered with the core 4, and its two ends are connected to the wound insulating cylinder 2 through the first locking electrode 5 and the second locking electrode 14. The first locking electrode 5 and the second locking electrode 14 adopt a trapezoidal thread 18 structure. The electrode is mechanically locked to the wound insulating cylinder 2 by tightening the thread. The electrode end face is machined with an annular sealing groove 17, which is filled with sealing grease. After locking, the airtightness is further improved. The overflow groove 15 is designed to remove excess sealant during the glue injection process to ensure that the sealant is evenly distributed and free of air bubbles, thereby improving the sealing effect and operational reliability.

[0039] The outer surface of the spiral wound insulating cylinder 2 is covered with a silicone umbrella-shaped jacket 1. The silicone umbrella-shaped jacket 1 and the insulating cylinder are coated with a vulcanization auxiliary agent and then subjected to high-temperature vulcanization treatment. After being integrally molded, they form a complete external protective structure. The silicone umbrella-shaped jacket 1 has excellent moisture-proof, anti-aging and environmental corrosion resistance properties, and can effectively isolate the influence of rainwater, moisture, dust and other external environmental factors on the internal structure, thereby improving the service life and long-term operating performance of the surge arrester.

[0040] Please see the appendix Figure 1 The wound insulating cylinder 2 is used to cover the core 4. Its interior is filled with two-component sealant 3. Both ends are sealed and connected by the first locking electrode 5 and the second locking electrode 14. The outer walls of the first locking electrode 5 and the second locking electrode 14 are provided with trapezoidal threads 18, and their surfaces are coated with sealing grease. The surface of the wound insulating cylinder 2 is uniformly coated with vulcanizing agent.

[0041] After vulcanization, the silicone umbrella-shaped outer jacket 1 is integrally connected to the spiral wound insulating cylinder 2 to form an external sealed protection. The silicone umbrella-shaped outer jacket 1 is made of weather-resistant silicone material, which has the properties of moisture resistance, UV protection and mechanical impact resistance, and is integrally connected to the spiral wound insulating cylinder 2 through high-temperature vulcanization.

[0042] Specifically, the spiral wound insulating cylinder 2 is used to cover the core 4. Its interior is filled with a two-component sealant 3. The two-component sealant 3 is uniformly injected into the internal space of the spiral wound insulating cylinder 2 through a vacuum negative pressure injection process to ensure that the sealant completely covers the outer surface of the core 4. The two ends are sealed and connected by a first locking electrode 5 and a second locking electrode 14. The outer walls of the first locking electrode 5 and the second locking electrode 14 are provided with trapezoidal threads 18. The design of the trapezoidal threads 18 can provide reliable mechanical locking force during tightening. At the same time, its surface is coated with sealing grease. The sealing grease and the thread structure form a good airtight effect, further preventing the penetration of external moisture or other media.

[0043] The surface of the spiral wound insulating cylinder 2 is uniformly coated with a vulcanizing agent. This agent enhances the bonding force between the silicone umbrella-shaped outer sleeve 1 and the spiral wound insulating cylinder 2, ensuring the stability and durability of the subsequent vulcanization process. After high-temperature vulcanization, the silicone umbrella-shaped outer sleeve 1 is integrally connected to the spiral wound insulating cylinder 2, forming an integrated external sealed protective structure. The silicone umbrella-shaped outer sleeve 1 is made of weather-resistant silicone material, possessing excellent moisture-proof, UV-proof, and mechanical impact-resistant properties. Simultaneously, the umbrella-shaped design effectively guides rainwater and moisture down the skirt, reducing the erosion of the internal structure by the external environment.

[0044] Please see the appendix Figure 6 -Appendix Figure 7 An annular sealing groove 17 is provided on one side of the first locking electrode 5 and the second locking electrode 14, and an overflow groove 15 is provided on the outer wall for sealing the connection of the spiral wound insulating cylinder 2 and draining excess sealant. The overflow groove 15 is provided on the outer wall of the first locking electrode 5 and the second locking electrode 14 to facilitate the discharge of excess sealant.

[0045] Specifically, an annular sealing groove 17 is provided on one side of the first locking electrode 5 and the second locking electrode 14. The annular sealing groove 17, in conjunction with the coated sealing grease, forms a reliable sealing structure when connected to the wound-wound insulating cylinder 2, effectively preventing the intrusion of external moisture or contaminants. An overflow groove 15 is provided on the outer wall. The position and shape of the overflow groove 15 are precisely designed to provide an overflow path for the two-component sealant 3 during the injection process, preventing excess sealant from accumulating inside the cylinder, which could lead to decreased sealing performance or residual air bubbles. The cooperation between the overflow groove 15 and the annular sealing groove 17 ensures that the sealant is evenly distributed in the locking area during the connection of the locking electrode and the wound-wound insulating cylinder 2. The amount of sealant is automatically adjusted by overflowing from the groove, preventing excessive sealant from hindering the locking action of the electrode or affecting the sealing effect.

[0046] Please see the appendix Figure 6 -Appendix Figure 8Each of the first locking electrode 5 and the second locking electrode 14 has an injection port 7 and a suction port 13 on opposite sides. Both the injection port 7 and the suction port 13 are equipped with sealing one-way valves 8 to remove gas from the cylinder and prevent backflow of air. The injection port 7 is connected to a vacuum negative pressure device for injecting two-component sealant 3, and the suction port 13 is used to expel air from the cylinder.

[0047] Specifically, each of the first locking electrode 5 and the second locking electrode 14 has an injection port 7 and a suction port 13 on opposite sides. A sealing one-way valve 8 is installed on the inner wall of both the injection port 7 and the suction port 13. The sealing one-way valve 8 effectively controls the unidirectional flow of gas, thereby eliminating gas from the cylinder during the injection process and preventing external air from flowing back into the internal space of the wound insulating cylinder 2. The injection port 7 is connected to a vacuum negative pressure device via a pipe. The suction provided by the vacuum negative pressure device evenly injects the two-component sealant 3 into the interior of the wound insulating cylinder 2, fully filling the space around the core 4 and ensuring a seamless sealant coverage. The suction port 13 is designed to expel gas and residual air generated during the injection process. The suction action eliminates any air bubbles that may remain in the cylinder, thus preventing air gaps within the sealant from affecting its sealing performance.

[0048] The positions of the injection port 7 and the suction port 13 are adapted to the internal structure of the cylinder, ensuring a reasonable flow path for the two-component sealant 3. At the same time, the synergistic effect of both ends achieves efficient injection and gas discharge functions, making the sealant distribution uniform throughout the entire wound insulating cylinder 2, further improving the sealing effect and the stability of equipment operation.

[0049] Please see the appendix Figure 1 An insulating component 12 is installed between the core 4 and the wound insulating cylinder 2 to enhance the electrical insulation performance of the surge arrester and avoid the risk of breakdown under internal high voltage conditions.

[0050] Specifically, an insulating component 12 is installed between the core 4 and the wound insulating cylinder 2. The insulating component 12 is made of high-strength, high-voltage resistant insulating material, and its shape and dimensions are tightly matched to the inner walls of the core 4 and the wound insulating cylinder 2, achieving a stable fixing effect through a reasonable assembly method. The insulating component 12 forms a protective layer with excellent electrical insulation performance between the core 4 and the wound insulating cylinder 2, significantly improving the insulation capability of the surge arrester under high-voltage operating conditions, thereby effectively preventing electrical breakdown that may occur under high electric field strength. The insulating component 12 can not only withstand long-term high voltage but also adapt to temperature changes and mechanical stress during surge arrester operation, maintaining stable insulation characteristics.

[0051] Please see the appendix Figure 9 The two-component potting and sealing method for gaps includes the following steps:

[0052] The core 4 is positioned by the first sealed positioning electrode 11 and the second sealed positioning electrode 10, and then sealed by heat shrinking after applying sealant.

[0053] The first locking electrode 5 and the second locking electrode 14 are respectively connected to the wound insulating cylinder 2, and axial pressure is applied to the core 4 by the pre-compression spring 9;

[0054] Two-component sealant 3 is injected through injection port 7 under vacuum negative pressure to remove air from the cylinder and fill it evenly.

[0055] Use sealing nut 6 to seal the glue injection port 7 and suction port 13;

[0056] A vulcanizing agent is applied to the spiral insulating cylinder 2 and the silicone umbrella-shaped outer jacket 1, and then vulcanized at high temperature to form an integrated sealed structure.

[0057] Specifically, the core 4 is installed between the first sealed positioning electrode 11 and the second sealed positioning electrode 10. The first sealed positioning electrode 11 and the second sealed positioning electrode 10 are evenly coated with sealant through the designed V-shaped sealing groove 16. After installation, a heat shrink process is performed. The heat shrink effect makes the sealant adhere tightly to the surface of the core 4 and the positioning electrode, forming a preliminary air seal, ensuring that the connection between the core 4 and the positioning electrode is firm and without gaps.

[0058] Then, the first locking electrode 5 and the second locking electrode 14 are respectively connected to both ends of the wound insulating cylinder 2. The locking electrodes are tightened through the trapezoidal thread 18 to form a stable mechanical connection with the outer wall of the insulating cylinder. The preload spring 9 is installed between the second sealed positioning electrode 10 and the core 4, and fixes the core 4 through axial pressure to maintain a stable stress state during long-term operation and prevent structural loosening caused by vibration or thermal expansion.

[0059] After installation, connect the spiral wound insulating cylinder 2 to the vacuum negative pressure equipment through the glue injection port 7. After starting the vacuum device, inject the two-component sealant 3 into the spiral wound insulating cylinder 2 through the glue injection port 7. At the same time, use the exhaust effect of the suction port 13 to remove residual gas and any air bubbles in the cylinder until the two-component sealant 3 is evenly distributed inside the spiral wound insulating cylinder 2 and completely covers the outer surface of the core 4.

[0060] After the glue injection process is completed, the glue injection port 7 and the suction port 13 are sealed with sealing nuts 6 respectively. The sealing nuts 6 cooperate with the annular sealing groove 17 on the locking electrode to form a tight sealing structure, further preventing external moisture or contaminants from entering the interior of the wound insulating cylinder 2 through the glue injection port 7 or the suction port 13.

[0061] A vulcanizing agent is uniformly coated on the outer surface of the spiral wound insulating cylinder 2 and the inner surface of the silicone umbrella-shaped outer sleeve 1. The vulcanizing agent enhances the bonding force between the silicone umbrella-shaped outer sleeve 1 and the spiral wound insulating cylinder 2. After coating, the silicone umbrella-shaped outer sleeve 1 is placed over the spiral wound insulating cylinder 2, and the two are integrated into a sealed structure through a high-temperature vulcanization process.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A surge arrester, comprising a core (4), a wound insulating cylinder (2), a first locking electrode (5), a second locking electrode (14), a silicone umbrella-shaped outer casing (1), a first sealed positioning electrode (11), and a second sealed positioning electrode (10), characterized in that: The core (4) is positioned by a first sealed positioning electrode (11) and a second sealed positioning electrode (10). The first sealed positioning electrode (11) and the second sealed positioning electrode (10) are provided with V-shaped sealing grooves (16), and after applying sealant, they are sealed to the core (4) by heat shrinking process. The wound insulating tube (2) is used to cover the core (4), and its interior is filled with two-component sealant (3). Both ends are sealed to each other by a first locking electrode (5) and a second locking electrode (14). The outer walls of the first locking electrode (5) and the second locking electrode (14) are provided with trapezoidal threads (18), and their surfaces are coated with sealing grease. The silicone umbrella-shaped outer jacket (1) is vulcanized and then integrally connected with the wound insulating cylinder (2) to form an external sealed protection. The first locking electrode (5) and the second locking electrode (14) have an annular sealing groove (17) on one side and an overflow groove (15) on the outer wall, which are used to seal the connection of the spiral insulating cylinder (2) and discharge excess two-component sealant (3). The first locking electrode (5) has an injection port (7) on its outer side, and the second locking electrode (14) has a suction port (13) on its outer side. Both the injection port (7) and the suction port (13) are equipped with sealing one-way valves (8). The injection port (7) is connected to a vacuum negative pressure device and is used to inject two-component sealant (3). The suction port (13) is used to discharge air from the cylinder.

2. A surge arrester according to claim 1, characterized in that, An insulating component (12) is installed between the core (4) and the wound insulating cylinder (2) to enhance the electrical insulation performance of the surge arrester and avoid the risk of breakdown under internal high voltage conditions.

3. A surge arrester according to claim 1, characterized in that, A preload spring (9) is provided between the second sealed positioning electrode (10) and the first locking electrode (5) to apply axial pressure to the core (4) to prevent structural loosening caused by long-term operation.

4. A surge arrester according to claim 1, characterized in that, The silicone umbrella-shaped outer cover (1) is made of weather-resistant silicone material, which has the properties of moisture-proof, UV protection and mechanical impact resistance, and is integrally connected with the wound insulating cylinder (2) through high-temperature vulcanization.

5. A surge arrester according to claim 1, characterized in that, The surface of the wound insulating tube (2) is uniformly coated with a vulcanizing agent to enhance its adhesion to the silicone umbrella-shaped outer jacket (1).

6. A two-component potting and sealing method for gaps, as described in any one of claims 1-5 for a surge arrester, characterized in that, Includes the following steps: The core (4) is positioned by the first sealed positioning electrode (11) and the second sealed positioning electrode (10), and then sealed by heat shrinking after applying sealant. The first locking electrode (5) and the second locking electrode (14) are respectively connected to the wound insulating cylinder (2), and axial pressure is applied to the core (4) by the preload spring (9); Two-component sealant (3) is injected through the injection port (7) under vacuum negative pressure to remove air from the cylinder and fill it evenly; Use a sealing nut (6) to seal the injection port (7) and the suction port (13); A vulcanizing agent is applied to the spiral insulating cylinder (2) and the silicone umbrella-shaped outer jacket (1), and then vulcanized at high temperature to form an integrated sealed structure.

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