Positioning structure for lightning arrester and lightning arrester

Abstract

The utility model belongs to the technical field of electrical equipment, and discloses a positioning structure for a lightning arrester and the lightning arrester. The positioning structure for the lightning arrester is used for fixing a thermal shrinkage core in an insulating cylinder, the positioning structure for the lightning arrester comprises a fixing end and a rotation stopping pin, the fixing end is used for being arranged at the end of the thermal shrinkage core, an electrode connecting hole is formed in the fixing end, and the electrode connecting hole is used for being in threaded connection with an electrode; the fixed end is provided with a rotation stopping screw hole, and the rotation stopping pin is used for penetrating through the insulating cylinder and is in threaded connection with the rotation stopping screw hole. The positioning structure for the lightning arrester is convenient to disassemble and assemble and simple in structure, and can improve the installation accuracy and firmness of the thermal shrinkage core body in the insulating cylinder, so that the assembly quality of the lightning arrester is improved, and the reliability and safety of the lightning arrester in the use process are ensured.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a positioning structure for a surge arrester and a surge arrester. Background Technology

[0002] The composite-jacketed gapless metal oxide surge arrester for AC systems (hereinafter referred to as surge arrester) is a high-performance overvoltage protector. It is mainly used to protect the equipment of power transmission and transformation stations of corresponding voltage levels from damage caused by atmospheric overvoltage and operational overvoltage, and is widely used in substations and other places.

[0003] Most commonly used surge arresters are cylindrical in structure. These cylindrical surge arresters mainly consist of a heat-shrinkable core with resistive elements, an insulating cylinder, a flange, and a silicone rubber jacket. During assembly, the heat-shrinkable core is typically inserted directly into the insulating cylinder, and the ends of the insulating cylinder are simply sealed to complete the assembly. However, this assembly method cannot effectively limit the movement of the internal heat-shrinkable core, resulting in a less robust and stable product structure. Utility Model Content

[0004] The purpose of this utility model is to provide a positioning structure and a surge arrester for surge arresters, which has a simple structure, is easy to disassemble and assemble, and can improve the assembly quality of surge arresters.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A positioning structure for a surge arrester, used to fix the heat-shrinkable core inside the insulating cylinder, the positioning structure for the surge arrester includes:

[0007] A fixed end is provided at the end of the heat-shrinkable core and connected to the heat-shrinkable core. The fixed end is provided with an electrode connection hole for threaded connection with an electrode.

[0008] An anti-rotation pin is provided on the fixed end, and the anti-rotation pin is used to pass through the insulating cylinder and is threadedly connected to the anti-rotation screw hole.

[0009] Preferably, the fixed end includes a connecting portion and a fixing portion, wherein one end of the connecting portion is connected to one end of the fixing portion;

[0010] The other end of the joint is used to connect with the heat-shrinkable core. The anti-rotation screw hole extends radially along the fixing part and is disposed on the fixing part. The electrode connection hole extends axially along the fixing part and is disposed on the other end of the fixing part.

[0011] Preferably, the outer wall surface of the fixing part is used to abut against the inner circumferential surface of the insulating cylinder, the joint part has a joint slope, the heat shrinkable sleeve of the heat shrinkable core is sandwiched between the joint slope and the inner circumferential surface of the insulating cylinder, and along the direction close to the fixing part, the joint slope gradually approaches the axis of the fixing part.

[0012] Preferably, a plurality of anti-rotation screw holes are evenly arranged along the circumference of the fixed end, and / or, at least two anti-rotation screw holes are arranged along the same generatrix on the fixed part.

[0013] Preferably, the joining part and the fixing part are integrally formed.

[0014] Preferably, the positioning structure for the surge arrester further includes an elastic element disposed at the end of the heat-shrinkable core away from the fixed end, and the elastic element abuts against the flange at the end of the insulating cylinder.

[0015] Preferably, the positioning structure for the surge arrester further includes a bearing, which is sandwiched between the elastic element and the heat-shrinkable core. The bearing includes an inner ring and an outer ring arranged axially. Both the outer ring and the inner ring are rotatable about the axis, and the inner ring abuts against the heat-shrinkable core and the outer ring abuts against the elastic element.

[0016] Preferably, the positioning structure for the surge arrester further includes a limiting seat, which is disposed at the end of the heat-shrinkable core away from the fixed end, and the elastic element is sleeved on the limiting seat, which can abut against the flange.

[0017] Preferably, the limiting seat is provided with a limiting groove, and the flange is provided with a protrusion that matches the limiting groove, the protrusion being inserted into the limiting groove.

[0018] A surge arrester includes an insulating cylinder, a heat-shrinkable core, electrodes, a flange, and the aforementioned positioning structure for the surge arrester;

[0019] The flange is fixed to one end of the insulating cylinder, the heat-shrinkable core is installed in the insulating cylinder and one end of the heat-shrinkable core abuts against the flange, the other end of the heat-shrinkable core is connected to the insulating cylinder through the fixed end, and the electrode is threaded to the fixed end.

[0020] The beneficial effects of this utility model are as follows:

[0021] The positioning structure for surge arresters provided by this utility model includes a fixed end and an anti-rotation pin. The fixed end is located at the end of the heat-shrinkable core. Since the fixed end has an electrode connection hole for threaded connection with an electrode, the operator can quickly install the electrode onto the heat-shrinkable core by screwing the electrode, which facilitates subsequent disassembly and maintenance, greatly simplifying the process. Since the fixed end has an anti-rotation screw hole, and the anti-rotation pin passes through the insulating cylinder with its end threaded into the anti-rotation screw hole, the heat-shrinkable core can be fixedly connected to the external insulating cylinder through the fixed end and the anti-rotation pin. Because the fixed end is connected to the heat-shrinkable core, the anti-rotation pin can limit the movement of the heat-shrinkable core inside the insulating cylinder, preventing it from shifting or rotating, thus ensuring that the surge arrester can properly release overvoltage.

[0022] The surge arrester provided by this utility model includes an insulating cylinder, a heat-shrinkable core, an electrode, and a flange. It adopts the positioning structure for surge arresters described above, which is simple in structure and easy to assemble and disassemble. At the same time, the positioning structure for surge arresters can improve the installation accuracy and firmness of the heat-shrinkable core in the insulating cylinder, thereby improving the assembly quality of the surge arrester and ensuring the reliability and safety of the surge arrester during use. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the surge arrester provided in a specific embodiment of this utility model;

[0024] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0025] Figure 3 This is a structural schematic diagram of the fixed end provided in a specific embodiment of this utility model.

[0026] In the picture:

[0027] 100 - Insulating cylinder;

[0028] 200 - Heat shrinkable core; 210 - Heat shrinkable tubing;

[0029] 300-electrode;

[0030] 400 - Flange; 410 - Raised face;

[0031] 500-Silicone rubber jacket;

[0032] 1-Fixed end; 11-Electrode connection hole; 12-Anti-rotation screw hole; 13-Joint part; 131-Jointing bevel; 14-Fixed part;

[0033] 2-Stop the transfer;

[0034] 3-Elastic element;

[0035] 4-Limiting seat;

[0036] 5-Bearing. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] like Figure 1 and Figure 2As shown, this utility model provides a positioning structure for a surge arrester, used to fix the heat-shrinkable core 200 inside the insulating cylinder 100. The positioning structure for the surge arrester includes a fixing end 1 and an anti-rotation pin 2. The fixing end 1 is used to be disposed at the end of the heat-shrinkable core 200 and connected to the heat-shrinkable core 200. The fixing end 1 is provided with an electrode connection hole 11, which is used to be threadedly connected to an electrode 300. The fixing end 1 is provided with an anti-rotation screw hole 12, and the anti-rotation pin 2 is used to pass through the insulating cylinder 100 and is threadedly connected to the anti-rotation screw hole 12.

[0042] In this embodiment, since the fixed end 1 is provided with an electrode connection hole 11, which is used to connect to the electrode 300 by thread, the operator can quickly install the electrode 300 onto the heat shrink core 200 by screwing the electrode 300, which is convenient for subsequent disassembly and maintenance, greatly facilitating the operator. Since the fixed end 1 is provided with an anti-rotation screw hole 12, and the anti-rotation pin 2 passes through the insulating cylinder 100 and its end is threaded to the anti-rotation screw hole 12, the heat shrink core 200 can be fixedly connected to the external insulating cylinder 100 through the fixed end 1 and the anti-rotation pin 2. Since the fixed end 1 and the heat shrink core 200 are connected, the anti-rotation pin 2 can limit the heat shrink core 200, preventing the heat shrink core 200 from moving and rotating inside the insulating cylinder 100, so as to ensure that the surge arrester can perform the function of normally releasing overvoltage. Specifically, the heat-shrinkable core 200 is a common conductive element installed inside the surge arrester insulation cylinder 100 in this field. It is mainly composed of a resistor sheet, an adjusting shim, and a heat-shrinkable sleeve 210. The resistor sheet and the adjusting shim are stacked, and the heat-shrinkable sleeve 210 tightly covers the resistor sheet and the adjusting shim, thus forming a tightly wrapped whole. The heat-shrinkable sleeve 210 is made of PVC, which can undergo plastic deformation after heating. Therefore, the fixing end 1 is connected to the end of the heat-shrinkable sleeve 210 by wrapping it with the end of the heat-shrinkable sleeve 210 after the end of the heat-shrinkable sleeve 210 is heat-shrinked at high temperature.

[0043] The structure of the fixed end 1 can be configured according to actual needs, as long as it ensures a stable connection with the anti-rotation pin 2 and the electrode 300 and facilitates assembly and disassembly. For example, such as Figure 1 and Figure 2As shown, the fixed end 1 includes a connecting portion 13 and a fixing portion 14. One end of the connecting portion 13 is connected to one end of the fixing portion 14; the other end of the connecting portion 13 is used to connect to the heat-shrinkable core 200. An anti-rotation screw hole 12 extends radially along the fixing portion 14 and is disposed on the fixing portion 14. An electrode connection hole 11 extends axially along the fixing portion 14 and is disposed on the other end of the fixing portion 14. Specifically, the fixed end 1 is connected to the heat-shrinkable core 200 and is located inside the insulating cylinder 100. The insulating cylinder 100 has a mounting hole, and the anti-rotation screw hole 12 is directly opposite the mounting hole. The mounting hole and the fixing end 14 on the insulating cylinder 100 are connected to the heat-shrinkable core 200. All anti-rotation screw holes 12 on the fixed part 14 are opened radially along the insulating cylinder 100, and the mounting holes are threaded holes. When assembling, the workers first need to adjust the position of the fixed end 1 inside the insulating cylinder 100 so that the mounting holes and anti-rotation screw holes 12 are aligned one by one. Then, the anti-rotation pin 2 is screwed into the mounting hole until the anti-rotation pin 2 is threadedly connected to the anti-rotation screw hole 12. At this time, the anti-rotation pin 2 is threadedly connected to the mounting hole and the anti-rotation screw hole 12 respectively, thereby fixing the fixed end 1 to the insulating cylinder 100 and preventing the fixed end 1 from rotating relative to the insulating cylinder 100 and moving along the axial direction.

[0044] like Figure 2 and Figure 3 As shown, to further improve the firmness and stability of the connection between the fixed end 1 and the insulating cylinder 100, the outer wall surface of the fixing part 14 is used to abut against the inner circumferential surface of the insulating cylinder 100. For example, the fixing part 14 has a cylindrical structure, and the outer circumferential surface of the fixing part 14 abuts against the inner circumferential surface of the insulating cylinder 100; the anti-rotation screw hole 12 is opened in the fixing part 14 radially, and the electrode connection hole 11 is opened in the fixing part 14 axially.

[0045] The beveled joint 131 is provided to ensure a tighter connection between the fixed end 1 and the heat shrink tubing 210; for example, Figure 2 and Figure 3 As shown, the joint 13 has a joint slope 131. The heat shrinkable sleeve 210 of the heat shrinkable core 200 is sandwiched between the joint slope 131 and the inner circumferential surface of the insulating cylinder 100. Along the direction close to the fixing part 14, the joint slope 131 gradually approaches the axis of the fixing part 14. It can be understood that the joint slope 131 is a frustum structure, and its outer diameter gradually decreases along the direction away from the heat shrinkable core 200. When the heat shrinkable core 200 and the fixing end 1 are installed into the insulating cylinder 100, the heat shrinkable sleeve 210 is sandwiched between the joint slope 131 and the inner circumferential surface of the insulating cylinder 100. The joint slope 131 can effectively prevent the heat shrinkable sleeve 210 from coming out from between the joint 13 and the insulating cylinder 100, thereby ensuring the firmness of the connection between the heat shrinkable sleeve 210 and the joint 13.

[0046] Specifically, such as Figure 3As shown, multiple anti-rotation screw holes 12 are evenly arranged along the circumference of the fixing part 14, and / or at least two anti-rotation screw holes 12 on the fixing part 14 are arranged along the same busbar. The multiple anti-rotation screw holes 12 are respectively connected to multiple anti-rotation pins 2, which further enhances the connection strength between the fixing end 1 and the insulating cylinder 100.

[0047] Furthermore, such as Figure 1 As shown, the positioning structure for the surge arrester also includes an elastic element 3. The elastic element 3 is disposed at the end of the heat-shrinkable core 200 away from the fixed end 1, and abuts against the flange 400 at the end of the insulating cylinder 100. In this embodiment, the flange 400 is threadedly connected to the insulating cylinder 100, thereby sealing the insulating cylinder 100 and facilitating the installation of the insulating cylinder 100 onto other components. The elastic element 3 is a spring, and the heat-shrinkable core 200 abuts against the flange 400 at the end through the elastic element 3, so as to eliminate manufacturing and assembly errors by means of the elastic deformation of the elastic element 3, thereby ensuring that the heat-shrinkable core 200 can always be electrically connected to the flange 400 through the elastic element 3.

[0048] like Figure 1 As shown, the positioning structure for the surge arrester also includes a bearing 5, which is sandwiched between the elastic element 3 and the heat-shrinkable core 200. The bearing 5 includes an inner ring and an outer ring arranged axially. Both the outer ring and the inner ring can rotate around the axis, and the inner ring abuts against the heat-shrinkable core 200 and the outer ring abuts against the elastic element 3. Specifically, the bearing 5 is a planar thrust bearing commonly used in the art for bearing axial loads. The inner ring and the outer ring of the bearing 5 are engaged by rollers or needle rollers, so the inner ring and the outer ring can rotate relative to each other. The bearing 5 can eliminate the torsional force of the flange 400 or the heat-shrinkable core 200 rotating around the axis during installation, reducing the assembly difficulty of the surge arrester. At the same time, it avoids the stress concentration of the flange 400 or the heat-shrinkable core 200 caused by torsion on the elastic element 3, which is beneficial to extending the service life of the elastic element 3.

[0049] like Figure 1 As shown, the positioning structure for the surge arrester also includes a limiting seat 4. The limiting seat 4 is located at the end of the heat-shrinkable core 200 away from the fixed end 1. The elastic element 3 is sleeved on the limiting seat 4. The limiting seat 4 can abut against the flange 400. The limiting seat 4 is a cylindrical structure and the axis of the limiting seat 4 coincides with the axis of the insulating cylinder 100. The elastic element 3 is sleeved on the limiting seat 4, thereby maintaining the stability of the elastic element 3 when it abuts against the flange 400, and preventing the elastic element 3 from tilting or displacing, which would affect the fixation of the heat-shrinkable core 200 in the insulating cylinder 100.

[0050] like Figure 1As shown, in order to improve the accuracy of the installation position of the heat-shrinkable core 200 inside the insulating cylinder 100, a limiting groove is provided on the limiting seat 4, and a protrusion 410 matching the limiting groove is provided on the flange 400 at the end of the insulating cylinder 100. The protrusion 410 is inserted into the limiting groove. Specifically, when installing the surge arrester, the worker puts the assembled heat-shrinkable core 200 into the insulating cylinder 100 and inserts the protrusion 410 on the flange 400 into the limiting groove along the axial direction of the heat-shrinkable core 200. Since the shape of the limiting groove matches that of the protrusion 410, the protrusion 410 plays a limiting role for the heat-shrinkable core 200 through the limiting groove, and cooperates with the connection between the other end fixed end 1 and the insulating cylinder 100 to prevent the heat-shrinkable core 200 from shaking during subsequent installation and use.

[0051] Furthermore, the heat-shrinkable core 200 has a regular cylindrical structure, the limiting groove is a cylindrical groove, and the protrusion 410 has a cylindrical structure. The axes of the insulating cylinder 100, the heat-shrinkable core 200, the limiting groove, and the protrusion 410 coincide. Therefore, when the protrusion 410 is inserted into the limiting groove, it can ensure that the heat-shrinkable core 200 is located in the center of the insulating cylinder 100. At this time, the outer circumferential surfaces of the heat-shrinkable sleeve 210 and the fixing part 14 are in contact with the inner circumferential surface of the insulating cylinder 100, thereby avoiding the eccentric installation of the heat-shrinkable core 100 in the insulating cylinder 100 and improving the assembly quality of the surge arrester.

[0052] This embodiment also provides a surge arrester, which includes an insulating cylinder 100, a heat-shrinkable core 200, an electrode 300, a flange 400, and the aforementioned positioning structure for the surge arrester. The flange 400 is fixed to one end of the insulating cylinder 100, the heat-shrinkable core 200 is installed in the insulating cylinder 100 and one end of the heat-shrinkable core 200 abuts against the flange 400, and the other end of the heat-shrinkable core 200 is connected to the insulating cylinder 100 through a fixed end 1. The electrode 300 is threadedly connected to the fixed end 1.

[0053] In this embodiment, the surge arrester has a simple structure and is easy to assemble and disassemble. At the same time, the positioning structure for the surge arrester improves the installation accuracy and firmness of the heat-shrinkable core 200 inside the insulating cylinder 100, thereby improving the assembly quality of the surge arrester and ensuring the reliability and safety of the surge arrester during use.

[0054] The assembly process of the surge arrester provided in this embodiment is roughly as follows:

[0055] First, the staff uses a heat gun to heat shrink the heat shrink sleeve 210 of the heat shrink core 200 and wrap it around the joint 13 of the fixed end 1, so that the fixed end 1 and the heat shrink core 200 form a tightly connected whole.

[0056] Afterwards, the workers put the heat-shrinkable core 200 with the fixed end 1 into the insulating cylinder 100 and adjusted the position of the heat-shrinkable core 200 so that the protrusion 410 on the flange 400 at the other end of the insulating cylinder 100 is inserted into the limiting groove of the heat-shrinkable core 200, and at the same time, the multiple anti-rotation screw holes 12 on the fixed end 1 are aligned with the multiple mounting holes on the insulating cylinder 100.

[0057] The workers then screwed the anti-rotation pin 2 into the mounting hole and threaded the anti-rotation pin 2 into the anti-rotation screw hole 12. After the fixed end 1 was connected to the insulating cylinder 100, the workers threaded the electrode 300 into the electrode connection hole 11 of the fixed end 1. Finally, the workers put a silicone rubber jacket 500 on the outside of the insulating cylinder 100 to protect the insulating cylinder 100 and the internal heat-shrinkable core 200.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A positioning structure for a surge arrester, used to fix a heat-shrinkable core (200) inside an insulating cylinder (100), characterized in that, The positioning structure for the surge arrester includes: A fixed end (1) is provided at the end of the heat shrinkable core (200) and connected to the heat shrinkable core (200). An electrode connection hole (11) is provided on the fixed end (1) and the electrode connection hole (11) is used to be threaded to the electrode (300). Anti-rotation pin (2), the fixed end (1) is provided with anti-rotation screw hole (12), the anti-rotation pin (2) is used to pass through the insulating cylinder (100) and is threaded to the anti-rotation screw hole (12).

2. The positioning structure for a surge arrester according to claim 1, characterized in that, The fixed end (1) includes a connecting part (13) and a fixing part (14), one end of the connecting part (13) being connected to one end of the fixing part (14); The other end of the joint (13) is used to connect with the heat shrink core (200), the anti-rotation screw hole (12) extends radially along the fixing part (14) and is disposed on the fixing part (14), and the electrode connection hole (11) extends axially along the fixing part (14) and is disposed on the other end of the fixing part (14).

3. The positioning structure for a surge arrester according to claim 2, characterized in that, The outer wall surface of the fixing part (14) is used to abut against the inner circumferential surface of the insulating cylinder (100). The joint part (13) has a joint inclined surface (131). The heat shrink sleeve (210) of the heat shrink core (200) is sandwiched between the joint inclined surface (131) and the inner circumferential surface of the insulating cylinder (100). Along the direction close to the fixing part (14), the joint inclined surface (131) gradually approaches the axis of the fixing part (14).

4. The positioning structure for a surge arrester according to claim 2, characterized in that, The anti-rotation screw holes (12) are evenly arranged in a plurality of them along the circumference of the fixing part (14), and / or, the anti-rotation screw holes (12) on the fixing part (14) are arranged in at least two along the same generatrix.

5. The positioning structure for a surge arrester according to any one of claims 2-4, characterized in that, The joining part (13) and the fixing part (14) are integrally formed.

6. The positioning structure for a surge arrester according to claim 1, characterized in that, The positioning structure for the surge arrester also includes an elastic element (3), which is disposed at the end of the heat-shrinkable core (200) away from the fixed end (1) and abuts against the flange (400) at the end of the insulating cylinder (100).

7. The positioning structure for a surge arrester according to claim 6, characterized in that, The positioning structure for the surge arrester also includes a bearing (5), which is sandwiched between the elastic element (3) and the heat-shrinkable core (200). The bearing (5) includes an inner ring and an outer ring arranged axially. Both the outer ring and the inner ring are rotatable around the axis, and the inner ring abuts against the heat-shrinkable core (200) and the outer ring abuts against the elastic element (3).

8. The positioning structure for a surge arrester according to claim 6, characterized in that, The positioning structure for the surge arrester also includes a limiting seat (4), which is located at the end of the heat-shrinkable core (200) away from the fixed end (1). The elastic element (3) is sleeved on the limiting seat (4), and the limiting seat (4) can abut against the flange (400).

9. The positioning structure for a surge arrester according to claim 8, characterized in that, The limiting seat (4) is provided with a limiting groove, and the flange (400) is provided with a protrusion (410) that matches the limiting groove, and the protrusion (410) is inserted into the limiting groove.

10. A surge arrester, characterized in that, It includes an insulating cylinder (100), a heat-shrinkable core (200), an electrode (300), a flange (400), and a positioning structure for a surge arrester as described in any one of claims 1-9; The flange (400) is fixed to one end of the insulating cylinder (100), the heat shrinkable core (200) is installed in the insulating cylinder (100) and one end of the heat shrinkable core (200) abuts against the flange (400), the other end of the heat shrinkable core (200) is connected to the insulating cylinder (100) through the fixed end (1), and the electrode (300) is threaded to the fixed end (1).

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