Arrester with coiled structure and manufacturing method thereof

Abstract

The invention discloses a coiling structure lightning arrester and a manufacturing method thereof, the coiling structure lightning arrester comprises a lightning protection core body, the lightning protection core body comprises an MOV resistor, a coiling positioning block and a height adjusting conductive block, the outer side surface of the coiling positioning block is provided with a positioning groove, the outer surface of the lightning protection core body is coated with a PI winding tape, and the outer surface of the PI winding tape is coiled with alkali-free glass fiber direct yarn. According to the lightning arrester with the coiled structure and the manufacturing method of the lightning arrester with the coiled structure, through cooperative arrangement of the coiled positioning block, the PI winding belt and the alkali-free glass fiber direct yarn, the lightning arrester with the coiled structure has the effects that the coiled structure is firm, the core body is high in strength, and the explosion-proof effect is good; the lightning arrester with the coiled structure and the manufacturing method of the lightning arrester have the effect of adjusting the glass fiber winding layer according to different requirements of different voltage grades, and the lightning arrester with the coiled structure and the manufacturing method of the lightning arrester with the coiled structure have the effect of reducing resource waste and environmental pollution by a glass fiber packaging process through the arrangement of the alkali-free glass fiber direct yarns.

Description

Technical Field

[0001] The invention relates to the technical field of lightning protection equipment, in particular to a coiled structure lightning arrester and a manufacturing method thereof. Background Art

[0002] An oxide lightning arrester is a device that protects electrical equipment from high voltage and lightning damage. It has the advantages of good protection characteristics, large current capacity, fast action response, simple structure, small size and light weight. Therefore, it is widely used in power generation, transmission, substation, distribution and other systems. During its long-term operation, it may thermally collapse due to sealing, aging and other reasons, causing explosion and splashing of the internal structure, seriously threatening the safety of its surrounding equipment and staff. At present, in order to improve the explosion-proof ability of the lightning arrester, its internal core adopts a mesh glass fiber wound core, but its winding process is single and not very reliable, and the glass fiber winding layer cannot be adjusted according to the different requirements of different voltage levels. Moreover, most of the glass fibers adopt a pre-impregnation process, which will cause resource waste and environmental pollution. Therefore, we propose a new type of coiled structure lightning arrester and its manufacturing method to solve the above technical problems. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a coiled structure lightning arrester and a manufacturing method thereof, which has the advantages that the winding structure is strong so that the core body has high strength and good explosion-proof effect, the glass fiber winding layer can be adjusted according to the different requirements of different voltage levels, and the glass fiber packaging process can reduce resource waste and reduce environmental pollution. It solves the problems of unreliability caused by a single winding process, the inability to adjust the glass fiber winding layer according to the different requirements of different voltage levels, and the glass fiber pre-impregnation process causing resource waste and environmental pollution.

[0004] (II) Technical solution In order to achieve the purpose of making the above-mentioned winding structure strong so that the core body has high strength and good explosion-proof effect, being able to adjust the glass fiber winding layer according to different requirements of different voltage levels, and the glass fiber packaging process can reduce resource waste and reduce environmental pollution, the present invention provides the following technical solutions: a coiled structure lightning arrester and a manufacturing method thereof, including a lightning protection core body, the lightning protection core body includes an MOV resistor, a coiled positioning block and a height adjustment conductive block, the outer side surface of the coiled positioning block is provided with a positioning groove, the outer surface of the lightning protection core body is covered with a PI winding tape, the outer surface of the PI winding tape is coiled with alkali-free glass fiber direct yarn, the outer surface of the alkali-free glass fiber direct yarn is covered with an epoxy layer, and the outer surface of the epoxy layer is covered with a silicone rubber umbrella skirt jacket.

[0005] Preferably, the number of the winding positioning blocks is two, respectively located at the two ends of the lightning protection core body, the number of the height adjustment conductive blocks is one or more, located in the middle of the lightning protection core body, and the number of MOV resistors is several, located between the winding positioning blocks and the height adjustment conductive blocks.

[0006] Preferably, a corrugated sheet is provided between the MOV resistor and the height adjustment conductive block, which can increase the mechanical strength of the lightning protection core so that the lightning protection core can withstand greater external force to avoid deformation, and can buffer and disperse the instantaneous increase in internal pressure when the lightning arrester is struck by lightning or overvoltage shock.

[0007] Preferably, the winding positioning block adopts a high-footed cup design with a large upper end and a small lower end, and the positioning groove is a structure for transitioning the upper and lower ends, wherein the outer diameter of the lower end of the winding positioning block is the same as the outer diameter of the MOV resistor and the height adjustment conductive block, and the outer diameter of the upper end of the winding positioning block is the same as the outer diameter of the epoxy layer.

[0008] Preferably, the PI wrapping tape is wrapped around the positioning groove of the positioning block from one end of the lightning protection core to the positioning groove of the positioning block at the other end of the lightning protection core. Through the spiral winding and coating of the PI wrapping tape and the curved surface effect, the various components constituting the lightning protection core are simply combined into one. The PI wrapping tape can insulate the side of the lightning protection core to enhance its lightning strike tolerance.

[0009] Preferably, the alkali-free glass fiber direct yarn is wound around the outer surface of the PI winding tape and is also wound into the positioning groove to make the lightning protection core body more firmly combined. By adjusting the thickness of the winding of the alkali-free glass fiber direct yarn, it can adapt to lightning arresters of various voltage levels.

[0010] Preferably, the linear density range of the alkali-free glass fiber direct yarn is between 1200 and 9600, and one or more strands can be used. When one strand is coiled, uniform diamond grid holes can be formed on the surface of the lightning protection core. The coiling formula of the alkali-free glass fiber direct yarn on the lightning protection core is: Y: longitudinal setting value; X: axial setting value; S: number of diamond grid holes; This formula can be used to quickly set parameters, and the number of diamond grid holes can be set according to different lightning arrester voltage levels. After the lightning protection core rotates 360 degrees, X can be increased by A degrees to achieve staggered coiling, so that the diamond grid holes on the lightning protection core are in a staggered stacking shape to form spiral diamond grid holes. When the A value is 0, the alkali-free glass fiber direct yarn is neatly stacked layer by layer to form deep right-angle diamond grid holes.

[0011] Preferably, the alkali-free glass fiber direct yarn is fully wound with progressive diameter, so that the lightning protection core has sealing performance and can be subjected to a water boiling test for more than 100 hours. In combination with the silicone rubber umbrella skirt jacket, double sealing can be achieved and it can be used in humid areas.

[0012] Preferably, the alkali-free glass fiber direct yarn is coated with a 30%-70% epoxy layer on its surface by a roller direct infiltration method, the drying room temperature is set at 85℃-100℃, the glue tank temperature is 95℃±5℃, and it is directly wound on the lightning protection core. The glue content is adjusted by the contact angle between the alkali-free glass fiber direct yarn and the glue tank. The contact angle is adjusted in the range of 15° to 50°, and the glue content is between 30% and 70%. The larger the angle, the higher the glue content.

[0013] Preferably, the outer surface of the epoxy layer is roughened after curing. After the roughening treatment, the silicone rubber is tightly wrapped on the outer surface of the epoxy layer through a vulcanization mold at a high temperature of 120-180 degrees to form a silicone rubber shed coat of various shapes. The silicone rubber has a very high insulation resistance and can effectively prevent current leakage. The shape of the shed helps to increase the creepage distance and improve the insulation performance.

[0014] Compared with the prior art, the present invention provides a coiled structure arrester and a manufacturing method thereof, which has the following beneficial effects: 1. The coiled structure arrester and the manufacturing method thereof, through the coordinated arrangement of the coiled positioning block, the PI winding tape and the alkali-free glass fiber direct yarn, make the coiled structure arrester and the manufacturing method thereof have the effect of a strong winding structure, high core strength and good explosion-proof effect. The positioning grooves opened around the coiled positioning block utilize the curved surface effect to tighten and prevent the two ends of the coiled PI winding tape and the alkali-free glass fiber direct yarn from falling off, so that the coiled structure is tight and high in strength. Since the lightning protection core is successively wrapped by two layers of high-strength coiled structures, it has high strength and good explosion-proof effect.

[0015] 2. The coiled structure arrester and the manufacturing method thereof, through the provision of the coiled positioning block, enable the coiled structure arrester and the manufacturing method thereof to have the effect of adjusting the glass fiber winding layer according to the different requirements of different voltage levels. Since the periphery of the coiled positioning block is provided with positioning grooves of sufficient size for the winding wire to turn and fix, the winding can be completed smoothly even if the angle of the wire is changed, and the angle of the wire winding can be changed to change the number of diamond grid holes, thereby achieving the effect of adjusting the glass fiber winding layer according to the different requirements of different voltage levels.

[0016] 3. The coiled structure lightning arrester and the manufacturing method thereof, through the setting of the alkali-free glass fiber direct yarn, enable the coiled structure lightning arrester and the manufacturing method thereof to have the effect of reducing resource waste and reducing environmental pollution by the glass fiber packaging process. The alkali-free glass fiber direct yarn is coated with an epoxy layer on the surface by a roller direct infiltration method and then directly coiled on the lightning protection core, so that the epoxy layer is directly formed when the alkali-free glass fiber direct yarn is coiled, and there is no need to make the epoxy layer by the impregnation method later, thereby reducing the waste of epoxy resin and thus reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a partial cross-sectional view of the coiled structure arrester proposed by the present invention; Figure 2 This is a structural schematic diagram of the appearance view of the lightning protection core of the coiled structure lightning arrester proposed by the present invention; Figure 3 This is a structural schematic diagram of a cross-sectional view of the lightning protection core of the coiled structure lightning arrester proposed by the present invention.

[0018] In the figure: 1. MOV resistor; 2. Coiled positioning block; 201. Positioning slot; 3. Height adjustment conductive block; 4. PI winding tape; 5. Alkali-free glass fiber direct yarn; 6. Epoxy layer; 7. Silicone rubber umbrella skirt jacket; 8. Corrugated sheet. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-3A coiled structure lightning arrester and a manufacturing method thereof, comprising a lightning protection core, the lightning protection core comprising an MOV resistor 1, a coiled positioning block 2 and a height adjustment conductive block 3, the number of the coiled positioning blocks 2 is two and respectively located at the two ends of the lightning protection core, the number of the height adjustment conductive blocks 3 is one or more and located in the middle of the lightning protection core, a number of MOV resistors 1 are located between the coiled positioning block 2 and the height adjustment conductive block 3, a positioning groove 201 is provided on the outer side of the coiled positioning block 2, the outer surface of the lightning protection core is covered with a PI winding tape 4, and the PI winding tape 4 is provided on the outer side of the lightning protection core. The winding tape 4 is wound around the positioning groove 201 of the positioning block 2 from one end of the lightning protection core to the positioning groove 201 of the positioning block 2 at the other end of the lightning protection core. The various components constituting the lightning protection core are simply combined into one by the spiral winding and coating of the PI winding tape 4 and the curved surface effect. The PI winding tape 4 can insulate the side of the lightning protection core to enhance the lightning resistance. The outer surface of the PI winding tape 4 is wound with an alkali-free glass fiber direct yarn 5. The alkali-free glass fiber direct yarn 5 is wound around the outer surface of the PI winding tape 4 and is also wound into the positioning groove 201 to make the lightning protection core The combination is more firm, and the thickness of the alkali-free glass fiber direct yarn 5 can be adjusted to adapt to arresters of various voltage levels. The outer surface of the alkali-free glass fiber direct yarn 5 is covered with an epoxy layer 6. The winding positioning block 2 adopts a high-footed cup design with a large upper end and a small lower end. The positioning groove 201 is a structure for transitioning the upper and lower ends, wherein the outer diameter size of the lower end of the winding positioning block 2 is the same as the outer diameter size of the MOV resistor 1 and the height adjustment conductive block 3, and the outer diameter size of the upper end of the winding positioning block 2 is the same as the outer diameter size of the epoxy layer 6, and the outer surface of the epoxy layer 6 is covered with a silicone rubber umbrella skirt The outer jacket 7, a corrugated sheet 8 is arranged between the MOV resistor 1 and the height adjustment conductive block 3, and the corrugated sheet 8 can increase the mechanical strength of the lightning protection core so that the lightning protection core can withstand greater external force to avoid deformation, and can buffer and disperse the instantaneous increase in the internal pressure of the lightning arrester when it is struck by lightning or overvoltage shock. The linear density of the alkali-free glass fiber direct yarn 5 ranges from 1200 to 9600, and one or more strands can be used together. When one strand is coiled, a uniform diamond grid hole can be formed on the surface of the lightning protection core. The coiling formula of the alkali-free glass fiber direct yarn 5 on the lightning protection core is: , Y: longitudinal setting value; X: axial setting value; S: number of diamond grid holes; This formula can be used to quickly set parameters, and the number of diamond grid holes can be set according to different arrester voltage levels. After the lightning protection core rotates 360 degrees, X can be increased by A degrees to achieve staggered winding, so that the diamond grid holes on the lightning protection core are in a staggered stacking shape to form spiral diamond grid holes. When the A value is 0, the alkali-free glass fiber direct yarn 5 is neatly stacked layer by layer to form deep right-angle diamond grid holes. The alkali-free glass fiber direct yarn 5 is fully coiled with progressive diameter to make the lightning protection core have sealing performance, and can be subjected to a water boiling test of more than 100 hours. It can be used in conjunction with the silicone rubber umbrella skirt jacket 7 to achieve double sealing and can be used in humid areas. The alkali-free glass fiber direct yarn 5 is directly impregnated with a roller The surface is coated with a 30%-70% epoxy layer 6, the drying room temperature is set at 85℃-100℃, the glue groove temperature is 95℃±5℃, and it is directly coiled on the lightning protection core. The glue content is adjusted by the contact angle between the alkali-free glass fiber direct yarn 5 and the glue groove. The contact angle adjustment range is between 15° and 50°, and the glue content is between 30% and 70%. The larger the angle, the higher the glue content. After the epoxy layer 6 is cured, the outer surface is roughened. After the roughening treatment, the silicone rubber is tightly wrapped on the outer surface of the epoxy layer 6 through a vulcanization mold at 120-180 degrees high temperature to form silicone rubber umbrella skirt jackets 7 of various shapes. Silicone rubber has high insulation resistance and can effectively prevent current leakage. The shape of the umbrella skirt helps to increase the creepage distance and improve the insulation performance.

[0021] The production process includes the following steps: (1) Stack several MOV resistors and several height-adjusting conductive blocks to form a column and place winding positioning blocks at both ends. Then use PI winding tape to spirally wind the winding positioning block at one end to the winding positioning block at the other end to form a whole. (2) Place the coiled MOV resistor and the coiled positioning block into the automated winding equipment and fix them; (3) Pull out the alkali-free glass fiber direct yarn in the drying room, pass it through the roller in the glue tank, so that the surface of the alkali-free glass fiber direct yarn is coated with an appropriate amount of epoxy layer, and set the temperature of the drying room and the glue tank to match each other, and then place the end of the alkali-free glass fiber direct yarn in the positioning groove of the winding positioning block; (4) Set the formula according to the technical requirements and adjust the equipment program parameters so that the alkali-free glass fiber direct yarn is quickly cross-wound on the surface of the PI winding belt and in the positioning groove of the winding positioning block according to the program to form a uniform diamond grid skeleton; (5) The coiled lightning protection core is placed on a specific tooling rack and put into an oven for curing and molding; (6) The surface of the solidified lightning protection core is roughened. After the roughening treatment, the silicone rubber is tightly wrapped around the lightning protection core through a vulcanization mold at a high temperature of 120-180 degrees to form umbrella skirt jackets of various shapes.

[0022] Note: The winding process must be kept clean and rubber gloves must be worn. Do not touch the resistor directly with your hands. The starting winding position must start from the middle part of the core. There should be no glue leakage during the core winding process to ensure that the core is not leaking glue after winding.

[0023] In step 1, it is necessary to ensure that the PI wrapping tape is tightly bonded to the outer surface of the lightning protection core to make it an integrated body. The overlapping size of the PI wrapping tape is 4mm~6mm, which can ensure that the integrated lightning protection core has a certain strength, facilitates transfer, and prevents breakage.

[0024] In step 3, the configuration ratio of the epoxy layer is epoxy resin: curing agent: accelerator = 1: 0.8: 0.003 or 1: 0.85: 0.004. It is configured in appropriate amounts according to production needs, and the maximum configuration each time is no more than 5kg. Specifically, first pour 1kg of epoxy resin into a mixing bucket, then pour 0.8kg of curing agent, and then use a small electronic scale to weigh 0.008kg of accelerator and pour it into the mixing bucket. Finally, use a mixer to stir for 5 minutes to make the epoxy resin glue evenly configured for use. The assembled epoxy resin glue can be stored at room temperature for a maximum of 24 hours or in a freezer at 0°C for 20 days. Each time, it should be configured in appropriate amounts according to production needs.

[0025] In summary, the coiled structure lightning arrester and its manufacturing method use the curved surface effect to tighten and prevent the two ends of the coiled PI winding tape and the alkali-free glass fiber direct yarn through the positioning grooves opened around the coiling positioning block, so that the coiled structure is tight and strong. Since the lightning protection core is successively wrapped by two layers of high-strength coiled structures, it has high strength and good explosion-proof effect. Since the coiling positioning block is provided with positioning grooves of sufficient size to allow the coiled silk thread to turn and fix, the coiling can be completed smoothly even if the angle of the silk thread is adjusted. Therefore, the angle of the silk thread winding can be changed to change the number of diamond grid holes, thereby achieving the effect of adjusting the glass fiber winding layer according to the different requirements of different voltage levels. The alkali-free glass fiber direct yarn is coated with an epoxy layer on the surface by a roller direct infiltration method and then directly coiled on the lightning protection core, so that the epoxy layer is directly formed when the alkali-free glass fiber direct yarn is coiled, and there is no need to make the epoxy layer by an impregnation method later, thereby reducing the waste of epoxy resin and thus reducing environmental pollution.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coiled structure lightning arrester and a method for manufacturing the same, comprising a lightning protection core, characterized in that: The lightning protection core comprises an MOV resistor (1), a coiled positioning block (2) and a height-adjusting conductive block (3); a positioning groove (201) is provided on the outer side of the coiled positioning block (2); an outer surface of the lightning protection core is coated with a PI winding tape (4); an alkali-free glass fiber direct yarn (5) is coiled on the outer surface of the PI winding tape (4); an outer surface of the alkali-free glass fiber direct yarn (5) is coated with an epoxy layer (6); and an outer surface of the epoxy layer (6) is coated with a silicone rubber shed coat (7).

2. The coiled structure arrester and the manufacturing method thereof according to claim 1, characterized in that: The number of the coiled positioning blocks (2) is two and they are located at the two ends of the lightning protection core body respectively; the number of the height adjustment conductive blocks (3) is one or more and they are located in the middle of the lightning protection core body; and the number of the MOV resistors (1) is a plurality and they are located between the coiled positioning blocks (2) and the height adjustment conductive blocks (3).

3. The coiled structure arrester and the manufacturing method thereof according to claim 1, characterized in that: A corrugated sheet (8) is provided between the MOV resistor (1) and the height-adjusting conductive block (3). The corrugated sheet (8) can increase the mechanical strength of the lightning protection core so that the lightning protection core can withstand greater external forces and avoid deformation, and can buffer and disperse the instantaneous increase in internal pressure when the lightning arrester is struck by lightning or subjected to overvoltage shock.

4. The coiled structure arrester and the manufacturing method thereof according to claim 1, characterized in that: The coiled positioning block (2) adopts a high-footed cup design with a larger upper end and a smaller lower end, and the positioning groove (201) is a structure that transitions between the upper and lower ends, wherein the outer diameter of the lower end of the coiled positioning block (2) is the same as the outer diameter of the MOV resistor (1) and the height adjustment conductive block (3), and the outer diameter of the upper end of the coiled positioning block (2) is the same as the outer diameter of the epoxy layer (6).

5. The coiled structure arrester and the manufacturing method thereof according to claim 1, characterized in that: The PI wrapping tape (4) is wound around the positioning groove (201) of the positioning block (2) from one end of the lightning protection core body to the positioning groove (201) of the positioning block (2) at the other end of the lightning protection core body. The various components constituting the lightning protection core body are simply combined into one body through the spiral winding and coating of the PI wrapping tape (4) and the curved surface effect. The PI wrapping tape (4) can insulate the side of the lightning protection core body and enhance the lightning strike tolerance capability.

6. The coiled structure arrester and the manufacturing method thereof according to claim 1, characterized in that: The alkali-free glass fiber direct yarn (5) is wound around the outer surface of the PI winding tape (4) and is also wound into the positioning groove (201) to make the lightning protection core body more firmly connected. By adjusting the thickness of the winding of the alkali-free glass fiber direct yarn (5), it can be adapted to lightning arresters of various voltage levels.

7. The coiled structure arrester and the manufacturing method thereof according to claim 1, characterized in that: The linear density of the alkali-free glass fiber direct yarn (5) is in the range of 1200-9600, and one strand or multiple strands can be used together. When one strand is coiled, uniform diamond-shaped grid holes can be formed on the surface of the lightning protection core. The coiling formula of the alkali-free glass fiber direct yarn (5) on the lightning protection core is: , Y: longitudinal setting value; X: axial setting value; S: number of diamond grid holes; this formula can be used to quickly set parameters, and the number of diamond grid holes can be set according to different voltage levels of lightning arresters. After the lightning protection core body rotates 360 degrees, increasing X by A degrees can achieve staggered winding, so that the diamond grid holes on the lightning protection core body are in a staggered stacking shape to form spiral diamond grid holes. When the A value is 0, the alkali-free glass fiber direct yarn (5) is neatly stacked layer by layer to form deep right-angle diamond grid holes.

8. The coiled structure arrester and the manufacturing method thereof according to claim 1, characterized in that: The alkali-free glass fiber direct yarn (5) is wound with progressive diameter and full coverage, so that the lightning protection core body has sealing performance and can be subjected to a water boiling test for more than 100 hours. In combination with the silicone rubber umbrella skirt jacket (7), double sealing can be achieved, so that it can be used in humid areas.

9. The coiled structure arrester and the manufacturing method thereof according to claim 1, characterized in that: The alkali-free glass fiber direct yarn (5) is coated with a 30%-70% epoxy layer (6) on its surface by a roller direct impregnation method, the drying room temperature is set at 85°C-100°C, the glue tank temperature is set at 95°C±5°C, and it is directly wound on the lightning protection core. The glue content is adjusted by the contact angle between the alkali-free glass fiber direct yarn (5) and the glue tank. The contact angle is adjusted in the range of 15° to 50°, and the glue content is between 30% and 70%. The larger the angle, the higher the glue content.

10. The coiled structure arrester and the manufacturing method thereof according to claim 1, characterized in that: After the epoxy layer (6) is cured, the outer surface is roughened. After the roughening treatment, the silicone rubber is tightly wrapped around the outer surface of the epoxy layer (6) by using a vulcanization mold through a high temperature of 120-180 degrees to form a silicone rubber shed coat (7) of various shapes. The silicone rubber has a very high insulation resistance and can effectively prevent current leakage. The shape of the shed helps to increase the creepage distance and improve the insulation performance.

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