Gap thermal shrinkage type lightning arrester and production process thereof

Abstract

The invention relates to the technical field of lightning arresters, and discloses a gap thermal shrinkage type lightning arrester and a production process thereof, and the lightning arrester comprises a cylinder used for coating and protecting a core component of the lightning arrester; the resistor disc is used for bearing and dispersing an electrical load; the sealed positioning electrode I and the sealed positioning electrode II are both of a stepped structure, the outer diameter of one end is tightly matched with the inner diameter of the cylinder body, and the other end is provided with a V-shaped sealing groove; the heat-shrinkable sleeve is used for wrapping the resistor disc, the sealed positioning electrode I and the sealed positioning electrode II and keeping the positions of the resistor disc, the sealed positioning electrode I and the sealed positioning electrode II; the pre-pressing spring is used for providing continuous axial pressure in the core body; the locking electrode adopts a trapezoidal thread structure and is used for locking the core body assembly; the insulating part is used for isolating and insulating the core body assembly and the cylinder body; and the sealant is used for filling the internal gap of the cylinder body. Through the V-shaped sealing groove and the annular sealing groove of the sealed positioning electrode and the uniform filling of the potting sealant, the gap thermal shrinkage lightning arrester can realize the efficient sealing of the internal space.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning arresters, and specifically to a gap heat-shrinkable lightning arrester and its production process. Background Art

[0002] With the rapid development of modern power systems, lightning arresters, as important overvoltage protection devices, are widely used in substations, power lines and related equipment. Traditional lightning arresters usually adopt a direct stacking structure of resistor chips and conductive electrodes, and are sealed and protected by potting sealant.

[0003] However, in the prior art, the assembly between the resistor chip and the conductive electrode is prone to uneven gaps or misalignment, and it is difficult for the potting sealant to evenly cover the inside of the cylinder during the filling process. Due to the presence of air gaps inside, the lightning arrester is prone to partial discharge during operation, which will not only reduce its electrical insulation performance, but also accelerate the aging of internal components. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a gap heat-shrinkable lightning arrester and its production process, which solves the problems that the assembly between the resistor chip and the conductive electrode is prone to uneven gaps or misalignment, and it is difficult for the potting sealant to evenly cover the inside of the cylinder during the filling process.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A gap heat-shrinkable lightning arrester, comprising: A cylinder for covering and protecting the core components of the lightning arrester; Resistor chips, which are the core components of the lightning arrester and are used to withstand and disperse electrical loads; Sealed positioning electrode one and sealed positioning electrode two, both of which are stepped structures, with the outer diameter of one end tightly fitted with the inner diameter of the cylinder, and a V-shaped sealing groove at the other end for cooperating with the heat-shrinkable sleeve to fix the resistor chips; A heat-shrinkable sleeve for covering the resistor chips, sealed positioning electrode one and sealed positioning electrode two and maintaining their positions; A preloading spring for providing continuous axial pressure inside the core; A locking electrode, adopting a trapezoidal thread structure, for locking the core components and improving the centering and structural strength of the assembly; An insulating part for isolating and insulating the core components from the cylinder; Sealant for filling the internal gap of the cylinder and enhancing the overall sealing performance; An overflow groove is provided at the joint of the sealed positioning electrode one and the sealed positioning electrode two and the cylinder, for accommodating the excess sealant, ensuring the potting uniformity and preventing the glue from overflowing and affecting the functions of other structures; An annular sealing groove is provided on the contact surface between the first sealed positioning electrode and the second sealed positioning electrode for accommodating sealant.

[0006] Preferably, the heat-shrinkable sleeve is uniformly heated to fully shrink and tightly cover the resistor sheet, the first sealed positioning electrode, and the second sealed positioning electrode to form an integral structure.

[0007] Preferably, sealing electric grease is uniformly applied in the V-shaped sealing grooves of the first sealed positioning electrode and the second sealed positioning electrode.

[0008] Preferably, the locking electrode is connected to the cylinder body by a threaded fit to tightly press and fix the resistor sheet, the first sealed positioning electrode, the second sealed positioning electrode, the preloading spring, and the insulating part in the cylinder body.

[0009] Preferably, the outer diameter and inner diameter between the cylinder body and the first sealed positioning electrode and the second sealed positioning electrode are precision machined so that the gaps around the inside of the cylinder body are uniform after assembly.

[0010] Preferably, the sealant is uniformly filled inside the cylinder body to eliminate air gaps.

[0011] Preferably, the setting position of the overflow groove corresponds to the contact surface of the cylinder body, the first sealed positioning electrode, and the second sealed positioning electrode, and can centrally collect excess sealant.

[0012] Preferably, the material of the heat-shrinkable sleeve is high-strength heat-resistant plastic.

[0013] Preferably, a production process for a gap heat-shrinkable lightning arrester includes the following steps: S1. Material preparation: Prepare resistor sheets, the first sealed positioning electrode, the second sealed positioning electrode, heat-shrinkable sleeves, preloading springs, locking electrodes, insulating parts, and cylinder bodies; S2. Component pretreatment: Uniformly apply sealing electric grease in the V-shaped sealing grooves and clean the surface of the resistor sheets; S3. Core assembly: Arrange a number of resistor sheets in sequence and put them into the heat-shrinkable sleeve, insert the first sealed positioning electrode and the second sealed positioning electrode into both ends of the heat-shrinkable sleeve respectively, and heat the heat-shrinkable sleeve to shrink and cover the resistor sheets and the sealed positioning electrodes; S4. Core installation: Insert the assembled heat-shrinkable core into the cylinder body so that the outer diameters of the first sealed positioning electrode and the second sealed positioning electrode are tightly fitted with the inner diameter of the cylinder body; S5. Locking and fixing: Place the preloading spring and the insulating part on the top of the core in sequence, and fix the core, the preloading spring, and the insulating part in the cylinder body through the locking electrode; S6. Sealant potting: Pour sealant through the overflow groove and the annular sealing groove to ensure the sealing performance inside the cylinder body; S7. Curing and cleaning: Cure the potting adhesive and clean the excess sealant in the overflow groove; S8. Performance testing: Test the lightning arrester.

[0014] Preferably, the performance testing in step S8 includes leakage current test, withstand voltage test, insulation performance test and sealing performance test.

[0015] The present invention provides a gap heat-shrinkable lightning arrester and its production process. It has the following beneficial effects: 1. Through the carefully designed sealing structure of the present invention, including the V-shaped sealing groove and annular sealing groove of the sealed positioning electrode, and the uniform filling of the potting sealant, the gap heat-shrinkable lightning arrester can achieve efficient sealing of the internal space. This structure avoids the existence of air gaps, prevents partial discharge phenomena, and at the same time prevents pollutants such as moisture and dust from entering the interior, significantly improving the sealing effect and electrical performance of the lightning arrester.

[0016] 2. The present invention adopts the uniform heating method of the heat-shrinkable sleeve to keep the resistor chip and the sealed positioning electrode in good coaxiality, thus forming a compact integrated structure. This structure solves the problems of component misalignment or looseness in traditional assembly, ensures the mechanical stability and operation reliability of the lightning arrester, and simplifies the assembly process at the same time.

[0017] 3. In the present invention, the resistor chip and the sealed positioning electrode are closely attached through the heat-shrinkable sleeve to ensure the integrity of the electrical contact surface and minimize the contact resistance. At the same time, the potting sealant completely eliminates air gaps and prevents partial discharge phenomena, thus significantly improving the insulation performance and long-term electrical stability of the lightning arrester.

[0018] 4. The lightning arrester of the present invention adopts a locking electrode with a trapezoidal thread structure, firmly fixes the components in the cylinder through thread fitting, and provides continuous axial pressure through a pre-compressed spring. This design greatly improves the mechanical strength of the lightning arrester, enabling it to withstand vibrations and external impacts during long-term operation, ensuring its reliability under harsh conditions. Description of the drawings

[0019] Figure 1 is a three-dimensional view of a gap heat-shrinkable lightning arrester of the present invention; Figure 2 is a schematic diagram of the core structure of a gap heat-shrinkable lightning arrester of the present invention; Figure 3 is a schematic diagram of a partial structure of the V-shaped sealing groove of a gap heat-shrinkable lightning arrester of the present invention; Figure 4 is a schematic diagram of a partial structure of the overflow groove of a gap heat-shrinkable lightning arrester of the present invention; Figure 5Schematic diagram of the partial structure of the sealed positioning electrode II of a gap heat-shrinkable lightning arrester according to the present invention; Figure 6 Schematic diagram of the partial structure of the trapezoidal thread of a gap heat-shrinkable lightning arrester according to the present invention; Figure 7 Schematic diagram of the partial structure of the locking electrode of a gap heat-shrinkable lightning arrester according to the present invention; Figure 8 Process flow chart of the production process of a gap heat-shrinkable lightning arrester according to the present invention.

[0020] Wherein, 1, cylinder body; 2, resistor chip; 3, sealed positioning electrode I; 4, sealed positioning electrode II; 5, heat-shrinkable sleeve; 6, preloading spring; 7, locking electrode; 8, insulating part; 9, sealant; 10, glue overflow groove; 11, V-shaped seal groove; 12, annular seal groove; 13, trapezoidal thread. Detailed implementation manners

[0021] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to the attached Figure 1 - attached Figure 7 , an embodiment of the present invention provides a gap heat-shrinkable lightning arrester, including: A cylinder body 1 for covering and protecting the core components of the lightning arrester; A resistor chip 2, which is the core component of the lightning arrester and is used to bear and disperse electrical loads; The sealed positioning electrode I 3 and the sealed positioning electrode II 4 are both in a stepped structure. One end of the outer diameter is closely matched with the inner diameter of the cylinder body 1, and the other end is provided with a V-shaped seal groove 11 for cooperating with the heat-shrinkable sleeve 5 to fix the resistor chip 2; A heat-shrinkable sleeve 5 for covering the resistor chip 2, the sealed positioning electrode I 3 and the sealed positioning electrode II 4 and maintaining their positions; A preloading spring 6 for providing continuous axial pressure inside the core; A locking electrode 7 having a trapezoidal thread 13 structure for locking the core assembly and improving the alignment and structural strength of the assembly; An insulating part 8 for isolating and insulating the core assembly from the cylinder body 1; A sealant 9 for filling the internal gap of the cylinder body 1 and enhancing the overall sealing performance; The glue overflow groove 10 is arranged at the joint of the sealed positioning electrode 1 and the sealed positioning electrode 2 and the cylinder body 1, and is used to accommodate the excess sealant 9, ensuring the potting uniformity and preventing the glue from overflowing to affect the functions of other structures; The annular seal groove 12 is arranged on the contact surface of the sealed positioning electrode 1 and the sealed positioning electrode 2, and is used to accommodate the sealant 9.

[0023] Specifically, through precise structural design and optimized assembly process, the gap heat shrinkable lightning arrester has achieved a comprehensive improvement in sealing performance, electrical performance, mechanical strength and assembly accuracy. The heat shrinkable sleeve 5 is uniformly heated to make the resistor chip 2, the sealed positioning electrode 1 and the sealed positioning electrode 2 fit tightly, forming an integrated structure, avoiding the problems of component misalignment or looseness, and at the same time ensuring the coaxiality and the uniformity of the internal gap. The V-shaped seal groove 11 and the annular seal groove 12 of the sealed positioning electrode 1 and the sealed positioning electrode 2, combined with the filling of the potting sealant 9, effectively prevent the formation of air gaps, eliminate partial discharge phenomena, and significantly improve the sealing performance and electrical stability of the lightning arrester. In addition, the design of the locking electrode 7 with a trapezoidal thread 13 structure and the preloading spring 6 enables the lightning arrester to have excellent mechanical strength and seismic resistance during operation, and can adapt to high-frequency vibration and external impact environments. The comprehensive effect of this innovative design provides the lightning arrester with stable and reliable long-term performance, and reaches the leading level in terms of sealing performance, electrical performance and structural stability.

[0024] The heat shrinkable sleeve 5 is uniformly heated to make it fully shrink and tightly wrap the resistor chip 2, the sealed positioning electrode 1 and the sealed positioning electrode 2, forming an integral structure.

[0025] Specifically, the heat shrinkable sleeve 5 is made of high-strength heat-resistant plastic material, which has a high elastic coefficient and excellent shrinkage characteristics. During the heat shrinkage process, the sleeve is uniformly heated by a special device to ensure that the surface temperature of the sleeve is consistent, avoiding local overheating or insufficient shrinkage. After heating, the sleeve shrinks uniformly in the radial direction and fits tightly with the resistor chip 2, the sealed positioning electrode 1 and the sealed positioning electrode 2. In this way, not only can the coaxiality between components be ensured and the occurrence of misalignment be prevented, but also the mechanical strength and sealing performance of the overall structure can be improved.

[0026] The heat shrinkable sleeve 5 forms an integral structure after heat shrinkage, effectively avoiding the problems of component misalignment or looseness in the traditional assembly method, and ensuring the stability and long-term reliability of the lightning arrester.

[0027] The V-shaped seal groove 11 of the sealed positioning electrode 1 and the sealed positioning electrode 2 is evenly coated with sealing electric grease.

[0028] Specifically, the sealed electrical grease has high viscosity and good insulation performance, and can form a uniform sealing layer in the V-shaped sealing groove 11. When applying, use dispensing or brush coating methods to ensure that the sealed electrical grease completely fills the V-shaped groove, avoiding air gaps or uncovered areas. The design of the V-shaped sealing groove 11 enables the sealed electrical grease to be further compacted during the component assembly process, forming a reliable sealing surface with the bushing and the cylinder 1.

[0029] By using the sealed electrical grease, the sealing performance of the component contact surface is further improved, preventing external moisture or dust from invading the arrester, thereby enhancing the safety and stability of its operation.

[0030] The locking electrode 7 is connected to the cylinder 1 through a threaded fit, and is used to press and fix the resistor chip 2, the sealed positioning electrode one 3 and the sealed positioning electrode two 4, the preloading spring 6 and the insulating part 8 in the cylinder 1.

[0031] Specifically, the locking electrode 7 is designed with a trapezoidal thread 13 and is precisely matched with the threaded part inside the cylinder 1. By tightening the locking electrode 7, an axial pressure can be applied to the components in the cylinder 1 to ensure that the resistor chip 2, the sealed positioning electrode one 3 and the sealed positioning electrode two 4 maintain stable contact. At the same time, the preloading spring 6 can provide a continuous elastic force after locking to prevent the components from loosening due to thermal expansion and contraction during long-term operation.

[0032] The design of the trapezoidal thread 13 fit and the preloading spring 6 can achieve high-precision fixing of the components, improve the reliability of the arrester structure, and enhance the seismic resistance of the arrester during long-term operation.

[0033] The outer diameter and inner diameter between the cylinder 1 and the sealed positioning electrode one 3 and the sealed positioning electrode two 4 are precision machined, so that the peripheral gaps in the cylinder 1 are uniform after assembly.

[0034] Specifically, the outer diameter of one end of the sealed positioning electrode one 3 and the sealed positioning electrode two 4 and the inner diameter of the cylinder 1 are precision machined, so that their fitting tolerance is within 0.01 mm, ensuring that there is no eccentricity or uneven gap during the assembly process. The uniform gap design facilitates the uniform filling of the sealing glue 9, avoiding the formation of air bubbles or dead corners.

[0035] Precision machining can not only ensure the close contact between components, but also improve the filling effect of the sealing glue 9, thereby enhancing the sealing performance and anti-aging performance of the arrester.

[0036] The sealing glue 9 is uniformly filled inside the cylinder 1 to eliminate air gaps.

[0037] Specifically, the sealant 9 is injected into the interior of the cylinder body 1 through a dedicated sealant injection device, and the air in the cylinder body 1 is removed through a vacuum process to prevent the formation of air gaps. The fluidity and curing performance of the sealant 9 are carefully selected to ensure excellent adhesion and aging resistance after curing.

[0038] The uniform filling of the sealant 9 eliminates air gaps, avoids partial discharge phenomena caused by air gaps, and significantly improves the electrical insulation performance and operating stability of the lightning arrester.

[0039] The setting position of the overflow groove 10 corresponds to the contact surfaces of the cylinder body 1, the sealed positioning electrode one 3, and the sealed positioning electrode two 4, and can centrally collect the excess sealant 9.

[0040] Specifically, the overflow groove 10 is designed on the outer edge contact surface of the sealed positioning electrode and matches the opening part of the cylinder body 1. During the potting process, the excess sealant 9 will flow into the overflow groove 10 under pressure, preventing the sealant 9 from overflowing to the surfaces of other structures or threaded mating areas. After curing, the excess colloid in the overflow groove 10 can be easily cleaned.

[0041] The design of the overflow groove 10 ensures the cleanliness of the potting process, avoids contaminating other components with excess colloid, and improves the assembly accuracy and production efficiency.

[0042] The material of the heat-shrinkable sleeve 5 is high-strength heat-resistant plastic.

[0043] Specifically, the heat-shrinkable sleeve 5 is made of a plastic material with high strength, excellent heat resistance, and elastic recovery performance, such as polyolefin or fluoroplastics. This material can quickly shrink and recover its elasticity under high-temperature conditions, while maintaining mechanical strength and chemical corrosion resistance during long-term use.

[0044] The use of high-performance materials enables the heat-shrinkable sleeve 5 to maintain a stable shape and performance in extreme environments, extending the service life of the lightning arrester.

[0045] Please refer to the attached Figure 8 , a production process for a gap heat-shrinkable lightning arrester, comprising the following steps: S1. Material preparation: Prepare the resistor chips 2, the sealed positioning electrode one 3, the sealed positioning electrode two 4, the heat-shrinkable sleeve 5, the pre-compression spring 6, the locking electrode 7, the insulating part 8, and the cylinder body 1; S2. Component pre-treatment: Uniformly apply sealant grease in the V-shaped seal groove 11 and clean the surface of the resistor chips 2; S3. Core assembly: Arrange a plurality of resistor chips 2 in sequence and place them into the heat-shrinkable sleeve 5. Insert the sealed positioning electrode one 3 and the sealed positioning electrode two 4 into both ends of the heat-shrinkable sleeve 5 respectively, and heat to make the heat-shrinkable sleeve 5 shrink and cover the resistor chips 2 and the sealed positioning electrodes; S4. Core Installation: Insert the assembled heat-shrinkable core into the cylinder 1 so that the outer diameters of the sealed positioning electrode 1 and the sealed positioning electrode 2 fit tightly with the inner diameter of the cylinder 1; S5. Locking and Fixing: Place the preloading spring 6 and the insulating part 8 on top of the core in sequence, and fix the core, the preloading spring 6 and the insulating part 8 in the cylinder 1 through the locking electrode 7; S6. Sealing Glue Potting: Pour the sealing glue through the glue overflow groove 10 and the annular sealing groove 12 to ensure the sealing performance inside the cylinder 1; S7. Curing and Cleaning: Cure the potted glue and clean the excess sealing glue 9 in the glue overflow groove 10; S8. Performance Testing: Test the lightning arrester.

[0046] The performance testing in step S8 includes leakage current test, withstand voltage test, insulation performance test and sealing performance test.

[0047] Specifically, conduct a comprehensive performance test on the completed lightning arrester to ensure that it meets the design requirements and the standards of the usage scenario. The performance testing includes the following specific contents: Leakage Current Test Testing Method: Connect the lightning arrester to a dedicated testing device, and detect whether the leakage current of the lightning arrester is within the design range under the condition of simulating the actual working voltage; Standard Requirement: The leakage current should be maintained within the microampere range to ensure extremely low energy loss of the lightning arrester under normal operating conditions; Purpose: Verify whether the varistors of the lightning arrester are working properly and whether there are insulation defects or structural defects.

[0048] Withstand Voltage Test Testing Method: Apply an overvoltage higher than its rated voltage (usually 1.5 times the rated voltage) to the lightning arrester and maintain it for a certain period of time to detect its withstand voltage performance; Standard Requirement: The lightning arrester should not be broken down or have insulation failure within the specified time; Purpose: Ensure the reliability of the lightning arrester under high voltage or transient overvoltage conditions and avoid failures caused by overvoltage.

[0049] Insulation Performance Test Testing Method: Detect the insulation resistance value between the outer shell of the lightning arrester and the internal core components through an insulation resistance measuring instrument; Standard Requirement: The insulation resistance value should be higher than the designed minimum insulation standard, usually from dozens of megohms to hundreds of megohms; Purpose: Verify whether the insulation between the outer shell and the core components of the lightning arrester meets the requirements to prevent electric leakage or short circuit.

[0050] Sealing Performance Test Test method: Place the lightning arrester in water under a certain pressure, or apply internal air pressure or vacuum conditions to it using professional sealing test equipment, and check for any air bubble leakage or abnormal pressure drop. Standard requirements: Good sealing performance, no air bubble leakage or pressure change. Purpose: Verify the working effect of the sealant and the annular sealing groove, and ensure that the lightning arrester can resist the erosion of external environments such as moisture and dust for a long time.

[0051] Mechanical strength test Test method: Apply vibration or shock loads simulating actual working conditions to the lightning arrester through a vibration testing machine or an impact testing device, and check for any looseness or structural failure of the components. Standard requirements: The lightning arrester has no looseness and no performance degradation under the specified vibration frequency or impact force. Purpose: Verify the reliability of the mechanical assembly of the lightning arrester and ensure that it can withstand mechanical loads during transportation, installation, and use.

[0052] Thermal stability test Test method: Place the lightning arrester in a high and low temperature cycle test chamber to simulate possible extreme temperature conditions in the actual environment and detect its performance changes. Standard requirements: The lightning arrester has stable performance under high and low temperature conditions, without an increase in leakage current or a decrease in insulation performance. Purpose: Verify whether the material selection and structural design of the lightning arrester can meet the usage requirements under extreme environmental conditions.

[0053] Appearance inspection Test method: Visually inspect or use a microscope to conduct a detailed inspection of the appearance of the lightning arrester shell, sealing groove, overflow glue groove, etc., to ensure no cracks, no obvious defects, or no overflow of glue. Standard requirements: The product has no defects in appearance, the surface is smooth, and the overflow glue groove is clean. Purpose: Ensure the consistency of product quality and improve customer satisfaction with the product.

[0054] Through the above comprehensive performance tests, the electrical performance, mechanical strength, sealing performance, and environmental adaptability of the lightning arrester can be effectively guaranteed, ensuring its high reliability and long life in actual applications. In particular, the leakage current, withstand voltage, and sealing tests directly verify the core performance of the lightning arrester and avoid potential safety hazards caused by production defects. At the same time, the appearance inspection and mechanical strength test improve the maintainability and market competitiveness of the product.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gap thermal shrinkage type lightning arrester, characterized in that, Comprising: A cylinder body (1) for wrapping and protecting the core components of the arrester; Resistor chips (2), which are the core components of the arrester and are used to bear and disperse electrical loads; A sealed positioning electrode one (3) and a sealed positioning electrode two (4), both of which are in a stepped structure. One end has an outer diameter that closely fits the inner diameter of the cylinder body (1), and the other end is provided with a V-shaped sealing groove (11) for cooperating with a heat-shrinkable sleeve (5) to fix the resistor chips (2); A heat-shrinkable sleeve (5) for wrapping the resistor chips (2), the sealed positioning electrode one (3) and the sealed positioning electrode two (4) and maintaining their positions; A preloading spring (6) for providing continuous axial pressure inside the core body; A locking electrode (7) having a trapezoidal thread (13) structure for locking the core body assembly and improving the alignment and structural strength of the assembly; An insulating member (8) for isolating and insulating the core body assembly from the cylinder body (1); A sealant (9) for filling the internal gap of the cylinder body (1) to enhance the overall sealing performance; An overflow groove (10) is provided at the joint of the sealed positioning electrode one (3) and the sealed positioning electrode two (4) and the cylinder body (1) for accommodating the excess sealant (9), ensuring the uniformity of potting and preventing the glue from overflowing and affecting the functions of other structures; An annular sealing groove (12) is provided on the contact surface of the sealed positioning electrode one (3) and the sealed positioning electrode two (4) for accommodating the sealant (9).

2. The clearance heat shrinkable lightning arrester according to claim 1, characterized in that, The heat-shrinkable sleeve (5) is uniformly heated to fully shrink and tightly wrap the resistor chips (2), the sealed positioning electrode one (3) and the sealed positioning electrode two (4) to form an integral structure.

3. The clearance heat-shrinkable lightning arrester according to claim 1, characterized in that, Sealing electric grease is uniformly applied in the V-shaped sealing groove (11) of the sealed positioning electrode one (3) and the sealed positioning electrode two (4).

4. The clearance heat-shrinkable lightning arrester according to claim 1, characterized in that, The locking electrode (7) is connected to the cylinder body (1) by thread fit for pressing and fixing the resistor chips (2), the sealed positioning electrode one (3), the sealed positioning electrode two (4), the preloading spring (6) and the insulating member (8) inside the cylinder body (1).

5. The clearance heat shrinkable lightning arrester according to claim 1, characterized in that, The outer diameter and inner diameter between the cylinder body (1) and the sealed positioning electrode one (3) and the sealed positioning electrode two (4) are precision machined so that the gaps around the inside of the cylinder body (1) are uniform after assembly.

6. The clearance heat-shrinking type lightning arrester according to claim 1, wherein The sealant (9) is uniformly filled inside the cylinder body (1) to eliminate air gaps.

7. The clearance heat-shrinkable lightning arrester according to claim 1, characterized in that, The setting position of the overflow groove (10) corresponds to the contact surface of the cylinder body (1), the sealed positioning electrode one (3) and the sealed positioning electrode two (4), and can centrally collect the excess sealant (9).

8. The clearance heat-shrinkable lightning arrester according to claim 1, wherein The material of the heat-shrinkable sleeve (5) is high-strength heat-resistant plastic.

9. A production process for a gap heat-shrinkable lightning arrester, which is used for the gap heat-shrinkable lightning arrester described in any one of claims 1-8, is characterized in that, Including the following steps: S1. Material preparation: Prepare the resistor chips (2), the sealed positioning electrode one (3), the sealed positioning electrode two (4), the heat-shrinkable sleeve (5), the preloading spring (6), the locking electrode (7), the insulating member (8) and the cylinder body (1); S2. Component pretreatment: Uniformly apply sealing electric grease in the V-shaped sealing groove (11) and clean the surface of the resistor chips (2); S3. Core assembly: Arrange several resistor chips (2) in sequence and place them into the heat-shrinkable sleeve (5). Insert the sealed positioning electrode one (3) and the sealed positioning electrode two (4) into both ends of the heat-shrinkable sleeve (5) respectively. Heat to make the heat-shrinkable sleeve (5) shrink and cover the resistor chips (2) and the sealed positioning electrodes; S4. Core installation: Insert the assembled heat-shrinkable core into the cylinder body (1) so that the outer diameters of the sealed positioning electrode one (3) and the sealed positioning electrode two (4) are closely fitted with the inner diameter of the cylinder body (1); S5. Locking and fixing: Place the pre-compression spring (6) and the insulating part (8) on the top of the core in sequence, and fix the core, the pre-compression spring (6) and the insulating part (8) in the cylinder body (1) through the locking electrode (7); S6. Sealing glue potting: Pour the sealing glue (9) through the overflow glue groove (10) and the annular sealing groove (12) to ensure the sealing inside the cylinder body (1); S7. Curing and cleaning: Cure the potted glue and clean the excess sealing glue (9) in the overflow glue groove (10); S8. Performance detection: Detect the lightning arrester.

10. The production process of the clearance heat-shrinkable lightning arrester according to claim 9, characterized in that, The performance detection in step S8 includes leakage current test, withstand voltage test, insulation performance detection and sealing performance detection.

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