Miniature tensioning type ceramic insulator

Abstract

The invention discloses a small-sized tensioning type ceramic insulator, and relates to the technical field of tensioning type ceramic insulators, the small-sized tensioning type ceramic insulator comprises a porcelain member, an inner container is arranged in the porcelain member, a first U-shaped frame and a second U-shaped frame are slidably arranged at the two ends of the inner container respectively, and a first sliding disc and a second sliding disc are slidably arranged in the inner container. The first sliding disc is fixedly connected to the first U-shaped frame, and a first circular groove allowing the second U-shaped frame to penetrate through is formed in the first sliding disc. According to the small tensioning type ceramic insulator, through arrangement of the first U-shaped frame, the second U-shaped frame, the charging barrel and other structures, excessive force borne by the two ends of the insulator is effectively buffered, the overall toughness and the structural strength of the insulator are improved, meanwhile, due to movement of the first U-shaped frame and the second U-shaped frame, a drying agent can be dispersed into the inner container, water vapor is adsorbed, and the service life of the insulator is prolonged. The inside of the inner container is kept in a dry state, the service life of the first sliding disc, the second sliding disc and other structures is prolonged, and the use efficiency of the insulator is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of tension-type ceramic insulators, and particularly relates to a small-sized tension-type ceramic insulator. Background Art

[0002] Tension insulators are mainly used in power transmission and distribution lines, playing an insulating role in pole guy wires or tensioned conductors. Tension insulators need to bear the vertical load, horizontal load and conductor tension of the conductors, so they must have good insulation performance and sufficient mechanical properties.

[0003] At present, most of the tension insulators on the market will be affected by air flow or other external forces at high altitude, resulting in external forces pulling on both ends. If there is no device at both ends of the insulator to weaken or reduce the direct force, it is very easy to cause structural deformation and damage, reducing the service life.

[0004] Therefore, it is necessary to propose a small-sized tension-type ceramic insulator to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a small-sized tension-type ceramic insulator to solve the problem that most of the tension insulators on the market will be affected by air flow or other external forces at high altitude, resulting in external forces pulling on both ends. If there is no device at both ends of the insulator to weaken or reduce the direct force, it is very easy to cause structural deformation and damage, reducing the service life.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A small-sized tension-type ceramic insulator, including a porcelain part, an inner liner is arranged inside the porcelain part, a first U-shaped frame and a second U-shaped frame are respectively slidably arranged at both ends of the inner liner, a first sliding disk and a second sliding disk are slidably arranged inside the inner liner, the first sliding disk is fixedly connected to the first U-shaped frame, a first circular groove for the second U-shaped frame to pass through is formed on the first sliding disk, the second sliding disk is fixedly connected to the second U-shaped frame, and a second circular groove for the first U-shaped frame to pass through is formed on the second sliding disk;

[0007] A spring is arranged between the first sliding disk and the second sliding disk;

[0008] An installation groove is formed on the second sliding disk, a material cylinder is fixedly connected inside the installation groove, the material cylinder is filled with a desiccant, a through groove is formed on the first sliding disk, and an insertion tube is fixedly connected inside the through groove. When installing the tension-type ceramic insulator, the first sliding disk and the second sliding disk move towards each other, the spring contracts for force unloading and buffering, and the insertion tube pierces the material cylinder so that the desiccant is dispersed into the inner liner.

[0009] Preferably, the insertion tube is wavy, and a tip is arranged at one end of the insertion tube close to the material cylinder.

[0010] Preferably, a side groove is formed on one side of the intubation tube, and the side groove penetrates through both ends of the intubation tube.

[0011] Preferably, the first U-shaped frame and the second U-shaped frame are vertically distributed.

[0012] Preferably, a plurality of springs are provided. One end of each spring is fixedly connected to the first sliding disk, and the other end of each spring is fixedly connected to the second sliding disk.

[0013] Preferably, bumps are fixedly connected to the ends of the first U-shaped frame and the second U-shaped frame located outside the inner tank. A limiting component is arranged on the outer side of the bump. The limiting component includes elastic clips. Two elastic clips are provided and are attached to each other. The elastic clips are fixedly connected to the outer wall of the inner tank. Card slots are formed on the surfaces of the two elastic clips facing each other. The elastic clips cooperate with the bumps through the card slots.

[0014] Preferably, the porcelain part includes an insulator core column. Skirt-shaped ribs are integrally formed on the outer ring of the insulator core column. A plurality of skirt-shaped ribs are provided and are evenly distributed. Water guiding grooves are formed on the skirt-shaped ribs.

[0015] Preferably, vertical grooves are formed on the inner ring of the insulator core column. A plurality of vertical grooves are provided and are evenly distributed around the inner ring of the insulator core column. Protruding strips are inserted into the vertical grooves. The protruding strips are fixedly connected to the outer wall of the inner tank.

[0016] Preferably, one end of the vertical groove penetrates through the insulator core column, and the height of the vertical groove is less than the axial length of the insulator core column.

[0017] Preferably, arc grooves are formed on the inner ring of the insulator core column. Both ends of each arc groove do not penetrate through the end surface of the insulator core column. A plurality of arc grooves are provided, and the plurality of arc grooves and the plurality of vertical grooves are alternately distributed one by one.

[0018] The technical effects and advantages of the present invention are as follows:

[0019] 1. By arranging structures such as the first U-shaped frame, the second U-shaped frame, and the cartridge, the present invention effectively buffers the excessive forces applied to both ends of the insulator, improves the overall toughness and structural strength of the insulator. At the same time, the movement of the first U-shaped frame and the second U-shaped frame will disperse the desiccant into the inner tank to adsorb water vapor, keeping the inside of the inner tank dry, extending the service life of structures such as the first sliding disk and the second sliding disk, and ensuring the use efficiency of the insulator.

[0020] 2. When the cannula pierces and passes through both ends of the barrel, the cannula passes through the first sliding plate and the second sliding plate, and is affected by the airflow generated by the first sliding plate and the second sliding plate moving toward each other, so that the desiccant is evenly distributed in the inner tank through the side grooves to ensure the drying efficiency;

[0021] 3. The cannula is wavy in shape. When it pierces and penetrates the two ends of the barrel, the tearing holes at both ends of the barrel become larger, making it easier for the desiccant to disperse from the inside of the barrel;

[0022] 4. Protrusions, limit components and other structures are provided to prevent the first U-shaped frame and the second U-shaped frame from sliding randomly, so that the desiccant is stored inside the barrel when the tension-type ceramic insulator is not installed and used, and there is no need to achieve a drying effect, thereby extending the service life and avoiding waste. After installation, multiple elastic clips are reset to respectively block and close the connection between the first U-shaped frame and the inner tank, and the connection between the second U-shaped frame and the inner tank to prevent being affected by water vapor;

[0023] 5. The water guide groove has a certain drainage function to prevent rainwater from accumulating on the shed. In addition, the water guide groove can relatively alleviate the expansion of the shed itself in a high temperature environment to avoid cracks in the shed.

[0024] 6. In high temperature environment, the arc slot inside the insulator core relatively alleviates the expansion of the porcelain itself;

[0025] 7. The tension-type ceramic insulator is assembled from ceramic parts, inner tanks, etc. When ceramic parts are damaged, they can be replaced in a targeted manner to reduce the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The diagram is a structural schematic diagram of a small tension-type ceramic insulator of the present invention.

[0027] Figure 2 It is a schematic diagram of the insulator core structure of the present invention.

[0028] Figure 3 It is a schematic diagram of the structure of the inner container, the first U-shaped frame and the second U-shaped frame of the present invention.

[0029] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure in the middle.

[0030] Figure 5 It is a schematic diagram of the first U-shaped frame and the protrusion structure of the present invention.

[0031] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point B in the middle.

[0032] Figure 7 It is a schematic diagram of the structure of the insulator core column and the convex strip of the present invention.

[0033] Figure 8 For the present invention Figure 7 Schematic enlarged view of the structure at position C in the present invention.

[0034] Figure 9 For the present invention Figure 7 Schematic enlarged view of the structure at position D in the present invention.

[0035] Figure 10 Schematic diagram of the vertical groove and rib structure of the present invention.

[0036] In the figure: 1, porcelain part; 101, insulator core column; 102, umbrella skirt; 103, water guide groove; 104, arc groove; 105, vertical groove; 2, inner liner; 3, first U-shaped bracket; 4, second U-shaped bracket; 5, first sliding disk; 6, second sliding disk; 7, installation groove; 8, barrel; 9, through groove; 10, insertion tube; 11, side groove; 12, tip; 13, rib; 14, bump; 15, elastic clip; 16, card slot; 17, first circular groove; 18, second circular groove; 19, spring. Specific embodiments

[0037] The present invention provides a small-sized tension-type ceramic insulator as shown in Figures 1 to 10 . It includes a porcelain part 1, and an inner liner 2 is arranged inside the porcelain part 1. The porcelain part 1 and the inner liner 2 have appropriate sizes, which is a small-sized tension-type ceramic insulator. The porcelain part 1 includes an insulator core column 101, and a plurality of umbrella skirts 102 are integrally formed on the outer circle of the insulator core column 101. The plurality of umbrella skirts 102 are evenly distributed.

[0038] A plurality of water guide grooves 103 are formed on the outer circle of the umbrella skirt 102. When the insulator is installed longitudinally (refer to Figure 1 ): The water guide grooves 103 have a certain drainage function to prevent rainwater from accumulating on the umbrella skirt 102, and the water guide grooves 103 can relatively relieve the expansion of the umbrella skirt 102 itself in a high-temperature environment, avoiding cracks in the umbrella skirt 102.

[0039] An arc groove 104 is arranged on the inner circle of the insulator core column 101. Both ends of the arc groove 104 do not penetrate the end surface of the insulator core column 101, ensuring the service strength of the insulator core column 101; a plurality of arc grooves 104 are provided, and the plurality of arc grooves 104 are staggered with a plurality of vertical grooves 105 one by one. Specifically, in a high-temperature environment, the arc groove 104 relatively relieves the expansion of the porcelain part 1 itself from the inside of the insulator core column 101.

[0040] Considering that the existing tension-type ceramic insulators are usually replaced as a whole directly after being damaged, in order to reduce the use cost, vertical grooves 105 are arranged on the inner ring of the insulator core column 101. There are multiple vertical grooves 105, and the multiple vertical grooves 105 are evenly distributed around the inner ring of the insulator core column 101. A convex strip 13 is inserted into the interior of the vertical groove 105, and the convex strip 13 is fixedly connected to the outer wall of the inner container 2.

[0041] The vertical groove 105 penetrates through one end of the insulator core column 101, and the height of the vertical groove 105 is less than the axial length of the insulator core column 101 (that is, the other end of the vertical groove 105 does not penetrate through the end surface of the insulator core column 101, refer to Figure 2 ), the convex strip 13 is quickly inserted into the interior of the vertical groove 105 from the end where the vertical groove 105 penetrates through the insulator core column 101. After the convex strip 13 is completely inserted, the assembly of the porcelain part 1 and the inner container 2 is completed.

[0042] In actual use, the porcelain part 1 and the inner container 2 can be separately manufactured, and then the assembly of the porcelain part 1 and the inner container 2 is completed through the cooperation of the convex strip 13 and the vertical groove 105. And an adhesive (such as: acrylate glue, etc., selected according to specific usage situations) can be used between the convex strip 13 and the vertical groove 105 to improve the stability of use.

[0043] The tension-type ceramic insulator is assembled by the porcelain part 1, the inner container 2, etc. After the porcelain part 1 is damaged, it can be replaced specifically, reducing the use cost.

[0044] A first U-shaped frame 3 and a second U-shaped frame 4 are respectively slidably arranged at both ends of the inner container 2. Structures such as the inner container 2, the first U-shaped frame 3, and the second U-shaped frame 4 can all be made of but are not limited to insulating materials. For example, insulating spraying treatment can be carried out on iron materials, which can be adjusted according to specific usage situations, and are docked with structures such as guy wires through the first U-shaped frame 3 and the second U-shaped frame 4.

[0045] The first U-shaped frame 3 and the second U-shaped frame 4 are vertically distributed to improve the overall structural strength; a first sliding disk 5 and a second sliding disk 6 are slidably arranged inside the inner container 2. The first sliding disk 5 is fixedly connected to the first U-shaped frame 3, and a first circular groove 17 for the second U-shaped frame 4 to pass through is formed on the first sliding disk 5. The second sliding disk 6 is fixedly connected to the second U-shaped frame 4, and a second circular groove 18 for the first U-shaped frame 3 to pass through is formed on the second sliding disk 6. When the first U-shaped frame 3 and the second U-shaped frame 4 move away from each other, the first sliding disk 5 and the second sliding disk 6 will be driven to move towards each other.

[0046] A spring 19 is arranged between the first sliding disk 5 and the second sliding disk 6. There are multiple springs 19, and the multiple springs 19 are respectively sleeved on the first U-shaped frame 3 and the second U-shaped frame 4. At the same time, one end of the spring 19 is fixedly connected to the first sliding disk 5, and the other end of the spring 19 is fixedly connected to the second sliding disk 6. When the first sliding disk 5 and the second sliding disk 6 move towards each other, the spring 19 will be compressed and contracted.

[0047] After the tension-type ceramic insulator is installed, it will be affected by air flow or other external forces at high altitude, pulling the first U-shaped bracket 3 and the second U-shaped bracket 4 at both ends of the insulator. The first U-shaped bracket 3 and the second U-shaped bracket 4 move away from each other, driving the first sliding disk 5 and the second sliding disk 6 to move towards each other. The spring 19 contracts, effectively buffering the excessive forces received at both ends of the insulator, and enhancing the overall toughness and structural strength of the insulator.

[0048] Considering that when used outdoors, especially in some areas with more rain and high air humidity, water vapor is likely to appear inside the inner tank 2, affecting the service life of the first sliding disk 5 and the second sliding disk 6. If desiccants are directly arranged inside the inner tank 2 during the production stage, due to the fact that some insulators will be placed or transported for a long time before installation, the desiccants will have been used for a certain period of time when the insulator is installed, which will affect the subsequent effective length. An installation groove 7 is provided on the second sliding disk 6, and a cartridge 8 is fixedly connected inside the installation groove 7. The inside of the cartridge 8 is filled with desiccants. The inside of the cartridge 8 is a sealed environment. The desiccants can be, but are not limited to, calcium chloride desiccants, which have the characteristics of fast moisture absorption speed, high moisture absorption rate, and no contact corrosion. The two ends of the cartridge 8 can be made of, but are not limited to, tin foil material for easy piercing; a through groove 9 is provided on the first sliding disk 5, and an insertion tube 10 is fixedly connected inside the through groove 9.

[0049] The first U-shaped bracket 3 and the second U-shaped bracket 4 move away from each other, driving the first sliding disk 5 and the second sliding disk 6 to move towards each other, causing the cartridge 8 and the insertion tube 10 to move towards each other. Since a tip 12 is provided at one end of the insertion tube 10 close to the cartridge 8, the insertion tube 10 pierces and penetrates both ends of the cartridge 8, and the desiccants are dispersed into the inner tank 2 to adsorb the water vapor, keeping the inside of the inner tank 2 dry during the use of the insulator, extending the service life of structures such as the first sliding disk 5 and the second sliding disk 6, and ensuring the use efficiency of the insulator.

[0050] Moreover, before the installation of the insulator, the first U-shaped bracket 3 and the second U-shaped bracket 4 can also be pulled away from each other manually to complete the preparatory work.

[0051] The insertion tube 10 is wavy. A tip 12 is provided at one end of the insertion tube 10 close to the cartridge 8. A side groove 11 is provided on one side of the insertion tube 10, and the side groove 11 penetrates both ends of the insertion tube 10, facilitating the dispersion of the desiccants.

[0052] Specifically, when the insertion tube 10 pierces and penetrates both ends of the cartridge 8, the insertion tube 10 presents a state of passing through the first sliding disk 5 and the second sliding disk 6. Affected by the air flow generated by the relative movement of the first sliding disk 5 and the second sliding disk 6, the desiccants are evenly distributed in the inner tank 2 through the side groove 11, ensuring the drying efficiency. In addition, the insertion tube 10 is wavy. When piercing and penetrating both ends of the cartridge 8, the tear openings at both ends of the cartridge 8 become larger, facilitating the dispersion of the desiccants from the inside of the cartridge 8.

[0053] To prevent the first U-shaped frame 3 and the second U-shaped frame 4 from sliding randomly, a protrusion 14 is fixedly connected to one end of the first U-shaped frame 3 and the second U-shaped frame 4 located outside the inner liner 2, and a limiting component is arranged on the outer side of the protrusion 14, and the limiting component includes an elastic clip 15. The elastic clip 15 can be made of but not limited to rubber material, and has appropriate elastic force and will not deform randomly. Two elastic clips 15 are arranged, and the two elastic clips 15 are fitted together. The elastic clips 15 are fixedly connected to the outer wall of the inner liner 2, and a slot 16 is provided on the side where the two elastic clips 15 are close to each other, and the elastic clip 15 cooperates with the protrusion 14 through the slot 16.

[0054] Before installation, the elastic clip 15 is clamped on the corresponding protrusion 14 through the clamping groove 16 (refer to Figure 9 ), so that the first U-shaped frame 3 and the second U-shaped frame 4 will not slide randomly, and the insertion tube 10 will not puncture the barrel 8, so that the desiccant is stored inside the barrel 8 when the tension-type ceramic insulator is not installed and used, and there is no need to achieve a drying effect, thereby extending the service life and avoiding waste.

[0055] During installation, when the first U-shaped frame 3 and the second U-shaped frame 4 move back to back, the protrusion 14 is driven to move synchronously, and the protrusion 14 opens the limiting assembly (the two elastic clips 15 are opened in a Y shape). After the protrusion 14 and the limiting assembly are offset, the multiple elastic clips 15 are reset to respectively block and close the connection between the first U-shaped frame 3 and the inner liner 2, and the connection between the second U-shaped frame 4 and the inner liner 2 to prevent them from being affected by water vapor.

[0056] Working principle: Before installation, the elastic clip 15 is connected to the corresponding protrusion 14 through the slot 16 (refer to Figure 9 ), so that the first U-shaped frame 3 and the second U-shaped frame 4 will not slide randomly, and the insertion tube 10 will not puncture the barrel 8, so that the desiccant is stored inside the barrel 8 when the tension-type ceramic insulator is not installed and used, and there is no need to achieve a drying effect, thereby extending the service life and avoiding waste.

[0057] After the tension-type ceramic insulator is installed, it will be affected by airflow or other external forces at high altitudes, and the first U-shaped frame 3 and the second U-shaped frame 4 at both ends of the insulator will be pulled. The first U-shaped frame 3 and the second U-shaped frame 4 move in opposite directions, and drive the first sliding plate 5 and the second sliding plate 6 to move toward each other. The spring 19 contracts, which effectively buffers the excessive force on the two ends of the insulator, thereby improving the overall toughness and structural strength of the insulator.

[0058] When the first U-shaped frame 3 and the second U-shaped frame 4 move in opposite directions, the protrusion 14 is driven to move synchronously, and the protrusion 14 opens the limiting assembly (the two elastic clips 15 are opened in a Y shape). After the protrusion 14 and the limiting assembly are offset, the multiple elastic clips 15 are reset to respectively block and close the connection between the first U-shaped frame 3 and the inner liner 2, and the connection between the second U-shaped frame 4 and the inner liner 2 to prevent them from being affected by water vapor.

[0059] The first slide plate 5 and the second slide plate 6 move toward each other, so that the barrel 8 and the insert tube 10 move toward each other. Since the insert tube 10 is provided with a tip 12 at one end close to the barrel 8, the insert tube 10 pierces and penetrates both ends of the barrel 8, so that the desiccant is dispersed into the inner liner 2, and the water vapor is adsorbed, so that the inner liner 2 remains dry during the use of the insulator, and the service life of the first slide plate 5, the second slide plate 6 and other structures is extended, and the use efficiency of the insulator is ensured; when the insert tube 10 pierces and penetrates both ends of the barrel 8, the insert tube 10 is in a state of passing through the first slide plate 5 and the second slide plate 6, so that the desiccant is evenly distributed in the inner liner 2 through the side groove 11, and the drying efficiency is ensured. In addition, the insert tube 10 is wavy, and when it pierces and penetrates both ends of the barrel 8, the tearing openings at both ends of the barrel 8 become larger, which facilitates the desiccant to be dispersed from the inside of the barrel 8. The water guide groove 103 has a certain drainage function to prevent rainwater from accumulating on the shed 102, and the water guide groove 103 can relatively alleviate the expansion of the shed 102 itself in a high temperature environment to prevent cracks in the shed 102; in addition, the arc groove 104 inside the insulator core column 101 relatively alleviates the expansion of the porcelain part 1 itself.

Claims

1. A small tension type ceramic insulator, comprising a porcelain part (1), characterized in that: An inner container (2) is arranged inside the porcelain part (1). A first U-shaped frame (3) and a second U-shaped frame (4) are respectively and slidably arranged at both ends of the inner container (2). A first sliding disk (5) and a second sliding disk (6) are slidably arranged inside the inner container (2). The first sliding disk (5) is fixedly connected to the first U-shaped frame (3). A first circular groove (17) for the second U-shaped frame (4) to pass through is formed on the first sliding disk (5). The second sliding disk (6) is fixedly connected to the second U-shaped frame (4). A second circular groove (18) for the first U-shaped frame (3) to pass through is formed on the second sliding disk (6). A spring (19) is arranged between the first sliding disk (5) and the second sliding disk (6). An installation groove (7) is formed on the second sliding disk (6). A material cylinder (8) is fixedly connected inside the installation groove (7). A desiccant is filled inside the material cylinder (8). A through groove (9) is formed on the first sliding disk (5). A cannula (10) is fixedly connected inside the through groove (9). When installing a tensioned ceramic insulator, the first sliding disk (5) and the second sliding disk (6) move towards each other, and the spring (19) contracts for unloading and buffering. Moreover, the cannula (10) pierces the material cylinder (8) so that the desiccant is dispersed into the inner container (2).

2. The small tension-type ceramic insulator according to claim 1, characterized in that: The cannula (10) is in a wavy shape. A tip (12) is arranged at one end of the cannula (10) close to the material cylinder (8).

3. A small tension-type ceramic insulator according to claim 1, characterized in that: A side groove (11) is formed on one side of the cannula (10), and the side groove (11) penetrates through both ends of the cannula (10).

4. A small tension-type ceramic insulator according to claim 1, characterized in that: The first U-shaped frame (3) and the second U-shaped frame (4) are vertically distributed.

5. A small tension-type ceramic insulator according to claim 1, characterized in that: A plurality of springs (19) are arranged. One end of each spring (19) is fixedly connected to the first sliding disk (5), and the other end of each spring (19) is fixedly connected to the second sliding disk (6).

6. A small tension-type ceramic insulator according to claim 1, characterized in that: Convex blocks (14) are fixedly connected to the ends of the first U-shaped frame (3) and the second U-shaped frame (4) located outside the inner container (2). A limiting component is arranged on the outer side of the convex blocks (14). The limiting component includes elastic clips (15). Two elastic clips (15) are arranged. The two elastic clips (15) are mutually attached. The elastic clips (15) are fixedly connected to the outer wall of the inner container (2). Card slots (16) are formed on the mutually approaching surfaces of the two elastic clips (15). The elastic clips (15) cooperate with the convex blocks (14) through the card slots (16).

7. A small tension-type ceramic insulator according to claim 1, characterized in that: The porcelain part (1) includes an insulator core column (101). A plurality of umbrella skirts (102) are integrally formed on the outer ring of the insulator core column (101). The plurality of umbrella skirts (102) are evenly distributed. Water guiding grooves (103) are formed on the umbrella skirts (102).

8. A small tension-type ceramic insulator according to claim 7, characterized in that: Vertical grooves (105) are arranged on the inner ring of the insulator core column (101). The plurality of vertical grooves (105) are evenly distributed around the inner ring of the insulator core column (101). A convex strip (13) is inserted inside the vertical grooves (105). The convex strip (13) is fixedly connected to the outer wall of the inner container (2).

9. A small tension-type ceramic insulator according to claim 8, characterized in that: The vertical groove (105) penetrates one end of the insulator core column (101), and the height of the vertical groove (105) is less than the axial length of the insulator core column (101).

10. A small tensioned ceramic insulator according to claim 7, characterized in that: An arc groove (104) is provided on the inner ring of the insulator core column (101). Both ends of the arc groove (104) do not penetrate the end surface of the insulator core column (101). A plurality of arc grooves (104) are provided, and the plurality of arc grooves (104) and the plurality of vertical grooves (105) are distributed in a staggered manner one by one.

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