Basin-type insulator

Abstract

The utility model discloses a basin-type insulator, comprising a flange ring, an insulator body and a conductor insert, the inner circumferential wall of the flange ring is provided with an annular groove, the annular groove extends along the circumferential direction of the flange ring, one side of the annular groove far away from the axial lead of the flange ring is provided with a plurality of clamping grooves, and the plurality of clamping grooves are arranged along the circumferential direction of the flange ring. The side, away from the axis of the flange ring, of at least one clamping groove penetrates to form a pouring opening, the insulator body is of an arc-shaped structure arching upwards, the insulator body is installed in the annular groove, a plurality of clamping parts corresponding to the clamping grooves are arranged on the peripheral wall of the insulator body, the clamping parts are arranged in the clamping grooves in a clamped mode, and the conductor insert is arranged on the insulator body. According to the basin-type insulator, the structural strength can be effectively improved, and the requirement of GIS equipment adopting mixed gas for higher structural strength of the basin-type insulator is met.

Description

Technical Field

[0001] The utility model relates to the technical field of GIS equipment, in particular to a pot-type insulator. Background Art

[0002] Gas-insulated metal-enclosed switchgear (also known as GIS) is an important equipment in the power system and is widely used in various fields. The insulating gas used in traditional GIS equipment is generally sulfur hexafluoride, which will have a certain impact on the environment. In order to reduce the emission of sulfur hexafluoride, some GIS equipment uses a mixture of sulfur hexafluoride and nitrogen as the insulating gas of GIS equipment.

[0003] The pot insulator is an important part of GIS equipment, used to support high-voltage conductors and to isolate components with different functions as needed. For GIS equipment using mixed gas, the pot insulator needs to have a higher structural strength. Therefore, how to improve the structural strength of the pot insulator has become an urgent problem to be solved. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a pot-type insulator, which can effectively improve the structural strength and meet the demand of GIS equipment using mixed gas for higher structural strength of the pot-type insulator.

[0005] According to the pot-type insulator of the embodiment of the utility model, it includes a flange ring, an insulator body and a conductor insert, the inner circumferential wall of the flange ring is provided with an annular groove, the annular groove extends along the circumference of the flange ring, a side of the annular groove away from the axial line of the flange ring is provided with a plurality of clamping grooves, the plurality of clamping grooves are arranged along the circumference of the flange ring, at least one side of the clamping groove away from the axial line of the flange ring is penetrated to form a casting port, the insulator body is an arc-shaped structure arched upward, the insulator body is installed in the annular groove, the outer circumferential wall of the insulator body is provided with a plurality of clamping parts corresponding to the clamping grooves, the clamping parts are clamped in the clamping grooves, and the conductor insert is arranged on the insulator body.

[0006] The pot-type insulator according to the embodiment of the utility model has at least the following beneficial effects:

[0007] Epoxy resin and other materials are poured toward the pouring port to form an insulator body in the flange ring. In this embodiment, in addition to being installed in the annular groove, the insulator body is also clamped in multiple slots through multiple clamping parts. The cooperation of the clamping parts and the slots can improve the connection stability between the insulator body and the flange ring, thereby improving the overall structural strength of the basin-type insulator. Moreover, the insulator body is an arc-shaped structure that arches upward, and is less likely to deform and be damaged when squeezed, thereby further improving the overall structural strength of the basin-type insulator, and meeting the requirements of GIS equipment using mixed gas for higher structural strength of basin-type insulators. In addition, the thickness of the insulator body can be nearly consistent and there is no need to increase the thickness of the insulator body, thereby not easily generating pore defects during molding, and saving materials.

[0008] According to some embodiments of the utility model, along the direction close to the axial centerline of the flange ring, the two side walls of the annular groove extend inclined in directions away from each other, the two opposite side walls of the groove extend inclined in directions away from each other, and the inclination angle of the side wall of the annular groove is equal to the inclination angle of the side wall of the groove.

[0009] According to some embodiments of the present invention, the inclination angle of the side wall of the annular groove is α, which satisfies: 14°≤α≤16°; and / or the maximum outer diameter of the conductor insert is D, which satisfies: 99mm≤D≤101mm.

[0010] According to some embodiments of the utility model, the insulator body is provided with a convex portion corresponding to the conductor insert, the convex portion protrudes from the two end surfaces of the insulator body, the conductor insert is arranged in the convex portion, and arc-shaped chamfers are respectively formed between the outer side wall of the convex portion and the two end surfaces of the insulator body.

[0011] According to some embodiments of the utility model, both end faces of the flange ring are provided with a first sealing groove, the first sealing groove extends along the circumference of the flange ring, and the first sealing groove is used to install the first sealing ring, and the edges of both end faces of the insulator body are provided with a second sealing groove, the second sealing groove extends along the circumference of the insulator body, and the second sealing groove is used to install the second sealing ring.

[0012] According to some embodiments of the utility model, the pot-type insulator also includes a plurality of connecting components and an annular shielding spring, wherein the plurality of connecting components are disposed on the flange ring and are arranged circumferentially of the flange ring, the annular shielding spring is disposed in the insulator body and extends circumferentially of the insulator body, and the annular shielding spring is connected to the plurality of connecting components.

[0013] According to some embodiments of the present invention, along the axial direction of the flange ring, the projection of the annular shielding spring is located outside the projections of all the conductor inserts, and the projection of the second sealing groove is located outside the projection of the annular shielding spring.

[0014] According to some embodiments of the present invention, the minimum distance between the center line of the annular shielding spring and the axial center line of the conductor insert is L, which satisfies: 176mm≤L≤178mm.

[0015] According to some embodiments of the utility model, the flange ring is provided with a mounting hole corresponding to the connecting component, the outer end of the mounting hole is provided with a first sinker, and the inner end of the mounting hole is provided with a second sinker, the connecting component includes a first screw, a first sealing gasket, a connecting spring, a second screw, a connecting part and a second sealing gasket, the first screw is threadedly connected to the mounting hole, the nut of the first screw extends into the first sinker, the first sealing gasket is sleeved on the outside of the first screw and clamped between the nut of the first screw and the end face of the first sinker, the connecting spring is located in the mounting hole and connected to the first screw, the nut of the second screw is connected to the end of the connecting spring away from the first screw, the connecting part is connected to the annular shielding spring and extends into the second sinker, the second screw is threadedly connected to the connecting part, the second sealing gasket is sleeved on the outside of the second screw and clamped between the nut of the second screw and the connecting part.

[0016] According to some embodiments of the utility model, the flange ring is provided with a sealing plate on the outer side of the pouring port, the sealing plate and one of the flange ring are provided with a third sealing groove, the third sealing groove surrounds the pouring port, a third sealing ring is provided in the third sealing groove, a pressure plate is provided on the side of the sealing plate facing away from the third sealing ring, and both the pressure plate and the sealing plate are connected to the flange ring through fasteners.

[0017] Additional aspects and advantages of the present invention will be partially given in the following description, and some advantages will become apparent from the following description or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 It is a structural schematic diagram of a pot-type insulator according to an embodiment of the utility model;

[0020] Figure 2 for Figure 1 One of the perspectives of

[0021] Figure 3It is a cross-sectional view of the flange ring;

[0022] Figure 4 is a cross-sectional view of the insulator body;

[0023] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0024] Figure 6 Schematic diagram of the blocking of the pouring mouth.

[0025] Figure Number:

[0026] Flange ring 100; annular groove 101; clamping groove 102; pouring port 103; first sealing groove 104; mounting hole 105; sealing plate 106; third sealing groove 107; third sealing ring 108; pressing plate 109;

[0027] Insulator body 200; clamping portion 201; convex portion 202; second sealing groove 203;

[0028] Conductor insert 300;

[0029] Connecting assembly 400; first screw 401; first sealing gasket 402; connecting spring 403; second screw 404; connecting portion 405; second sealing gasket 406;

[0030] Annular shield spring 500 . DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present utility model, "a plurality" refers to two or more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Reference below Figures 1 to 6 A pot-type insulator according to an embodiment of the utility model is described.

[0036] refer to Figures 1 to 6 As shown, the pot-type insulator according to the embodiment of the utility model includes a flange ring 100 , an insulator body 200 and a conductor insert 300 .

[0037] Among them, the flange ring 100 can be made of metal, and the inner wall of the flange ring 100 is provided with an annular groove 101, which extends along the circumference of the flange ring 100. A plurality of grooves 102 are provided on the side of the annular groove 101 away from the axis of the flange ring 100, and the plurality of grooves 102 are arranged along the circumference of the flange ring 100. For example, four grooves 102 can be provided, and the four grooves 102 can be evenly arranged along the circumference of the flange ring 100. At least one of the grooves 102 is penetrated on the side away from the axis of the flange ring 100 to form a casting port 103. For example, a groove 102 can be penetrated on the side away from the axis of the flange ring 100 to form a casting port 103. When the insulator body 200 is cast, the casting port 103 is used for injection of casting materials such as epoxy resin.

[0038] The contour of the outer wall of the insulator body 200 can be circular, and the insulator body 200 can be an arc-shaped structure that arches upward, such as a circular arc structure. The edge portion of the insulator body 200 can be installed in the annular groove 101, and the outer wall of the insulator body 200 is provided with a plurality of clamping parts 201 corresponding to the clamping slot 102. For example, when there are four clamping slots 102, there can be four clamping parts 201 and they are evenly arranged along the circumference of the insulator body 200, and the clamping parts 201 are clamped in the clamping slot 102.

[0039] The conductor insert 300 is disposed in the insulator body 200 . There may be a plurality of conductor inserts 300 , for example, three conductor inserts 300 . The three conductor inserts 300 may be distributed in an isosceles triangle. The conductor inserts 300 are used to install conductors.

[0040] In this embodiment, epoxy resin and other materials are poured toward the pouring port 103 to form an insulator body 200 in the flange ring 100. In this embodiment, in addition to being installed in the annular groove 101, the insulator body 200 is also clamped in multiple clamping grooves 102 through multiple clamping parts 201. Through the cooperation of the clamping parts 201 and the clamping grooves 102, the connection stability between the insulator body 200 and the flange ring 100 can be improved, thereby improving the overall structural strength of the basin insulator. In addition, the insulator body 200 is an arc-shaped structure that arches upward, and is less likely to be deformed and damaged when squeezed, thereby further improving the overall structural strength of the basin insulator, meeting the requirements of GIS equipment using mixed gas for higher structural strength of the basin insulator. In addition, the thickness of the insulator body 200 can be nearly consistent and there is no need to increase the thickness of the insulator body 200, so that it is not easy to produce pore defects during molding, and it can also save materials.

[0041] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, along the direction close to the axis of the flange ring 100, the two side walls of the annular groove 101 extend obliquely in a direction away from each other, and the two opposite side walls of the clamping groove 102 extend obliquely in a direction away from each other, and the inclination angle of the side wall of the annular groove 101 is equal to the inclination angle of the side wall of the clamping groove 102. In this embodiment, the side wall of the annular groove 101 and the side wall of the clamping groove 102 are both inclined, and the inclination angles are equal, so that during the water pressure test, the side wall of the annular groove 101 and the side wall of the clamping groove 102 can apply force in the same direction, and the contact area between the insulator body 200 and the flange ring 100 is larger, so that the insulator body 200 is subjected to more uniform force, which can reduce the stress concentration phenomenon, thereby further improving the overall structural strength of the pot-type insulator.

[0042] In some embodiments of the present invention, Figure 6 As shown, the inclination angle of the side wall of the annular groove 101 is α, which satisfies: 14°≤α≤16°. For example, the inclination angle of the side wall of the annular groove 101 can be 14°, 15°, 16° or other suitable angles. The pot-type insulator is installed in a water pressure test fixture and a pressure test is performed. When the side wall of the annular groove 101 adopts different inclination angles, the pressure resistance of the pot-type insulator is shown in Table 1, wherein the water pressure resistance value of the pot-type insulator is greater than or equal to 2.34Mpa and is qualified.

[0043] Table 1

[0044] Angle of annular groove 3° 5° 7.5° 11° 15° 19° Water pressure tolerance value of pot insulator (Mpa) 2.0 2.4 2.7 2.8 3.2 2.8

[0045] It can be seen from Table 1 that when the inclination angle of the side wall of the annular groove 101 is around 15°, the water pressure tolerance value of the pot-type insulator is the largest. Therefore, in the present invention, the inclination angle α of the side wall of the annular groove 101 is set to: 14°≤α≤16°. Similarly, the inclination angle of the side wall of the clamping groove 102 is set to be greater than or equal to 14° and less than or equal to 16°, which can further improve the overall structural strength of the pot-type insulator.

[0046] In some embodiments of the present invention, Figure 4 As shown, along the axial direction of the conductor insert 300, the outer diameter of the conductor insert 300 has different values, and the maximum outer diameter of the conductor insert 300 is D, which satisfies: 99mm≤D≤101mm. For example, the maximum outer diameter of the conductor insert 300 can be 99mm, 100mm, 101mm or other suitable values.

[0047] Based on the theory of elastic mechanics and using ANSYS WORKBENCH software, the water pressure stress field distribution of the pot insulator for 363KV mixed gas GIS equipment is calculated. The calculation method is: simulate the installation of the pot insulator in the water pressure test fixture, model it, and perform stress field analysis and calculation. The maximum principal stress between the conductor insert 300 and the insulator body 200 when the conductor insert 300 adopts different maximum outer diameters is calculated, as shown in Table 2, where the maximum principal stress between the conductor insert 300 and the insulator body 200 is less than or equal to 70Mpa.

[0048] Table 2

[0049]

[0050] It can be seen from Table 2 that when the maximum outer diameter of the conductor insert 300 is around 100 mm, the maximum principal stress between the conductor insert 300 and the insulator body 200 is the smallest. Therefore, in the present invention, the maximum outer diameter D of the conductor insert 300 is set to: 99 mm ≤ D ≤ 101 mm. In this way, the maximum principal stress between the conductor insert 300 and the insulator body 200 can be reduced, thereby further improving the overall structural strength of the pot-type insulator.

[0051] In some embodiments of the present invention, Figure 4 As shown, a circular arc chamfer with a radius of 5 mm is provided between the portion with the smallest outer diameter of the conductor insert 300 and the portion with the largest outer diameter of the conductor insert 300. Such a configuration can further reduce stress concentration, thereby further improving the overall structural strength of the pot-type insulator.

[0052] In some embodiments of the present invention, Figure 1 , Figure 2 and Figure 4As shown, the insulator body 200 is provided with a convex portion 202 corresponding to the conductor insert 300, the convex portion 202 protrudes from the two end surfaces of the insulator body 200, the conductor insert 300 is arranged in the convex portion 202, and arc-shaped chamfers are formed between the outer wall of the convex portion 202 and the two end surfaces of the insulator body 200. For example, three convex portions 202 can be provided, and the three convex portions 202 can be distributed in an isosceles triangle, and a 40mm arc-shaped chamfer can be formed between the outer wall of the convex portion 202 and the convex surface of the insulator body 200, and a 35mm arc-shaped chamfer can be formed between the outer wall of the convex portion 202 and the concave surface of the insulator body 200. Such an arrangement can better reduce the maximum principal stress of the insulator body 200 around the convex portion 202, and reduce the damage of the pot-type insulator caused by the stress concentration of the insulator body 200 around the conductor insert 300.

[0053] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, both end faces of the flange ring 100 are provided with a first sealing groove 104, the first sealing groove 104 extends along the circumference of the flange ring 100, and the first sealing groove 104 is used to install a first sealing ring, which may be an O-shaped sealing ring. Both end faces of the insulator body 200 are provided with a second sealing groove 203 at their edges, the second sealing groove 203 extends along the circumference of the insulator body 200, and the second sealing groove 203 is used to install a second sealing ring, which may be an O-shaped sealing ring. In this embodiment, the first sealing groove 104 is provided, and when the pot-type insulator is installed in the GIS equipment, the first sealing ring can be installed in the first sealing groove 104, thereby improving the sealing performance. The second sealing groove 203 is provided, and when the pot-type insulator is installed in the GIS equipment, the second sealing ring can be installed in the second sealing groove 203, thereby even if there is a small amount of leakage in the first sealing ring, it can still be blocked by the second sealing ring, thereby further improving the sealing performance.

[0054] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the depth of the second sealing groove 203 is greater than the depth of the first sealing groove 104, and in the axial dimension of the flange ring 100, the side of the two first sealing grooves 104 that are separated from each other is approximately 0.5 mm outside the side of the two second sealing grooves 203 that are separated from each other. In this embodiment, such an arrangement can make the filling rate and compression rate of the first sealing ring of the first sealing groove 104 and the second sealing ring of the second sealing groove 203 in a suitable state, thereby achieving better sealing performance.

[0055] In some embodiments of the present invention, Figure 5 and Figure 6As shown, the side wall of the second sealing groove 203 is formed by connecting multiple arc-shaped surfaces. In this embodiment, such an arrangement can further make the filling rate of the second sealing ring in the second sealing groove 203 within a suitable range, make the compression rate of the second sealing ring within a suitable range, and further make the sealing effect of the second sealing ring better.

[0056] In some embodiments of the present invention, Figure 5 As shown, the pot-type insulator further includes a plurality of connection components 400 and an annular shielding spring 500. The plurality of connection components 400 are provided on the flange ring 100 and arranged along the circumference of the flange ring 100. The annular shielding spring 500 is provided in the insulator body 200 and extends along the circumference of the insulator body 200. The annular shielding spring 500 is connected to the plurality of connection components 400. The annular shielding spring 500 is provided to shield the electric field generated by the conductor on the conductor insert 300 from the external electric field, thereby reducing the influence of the external electric field on the conductor.

[0057] It should be noted that the annular shielding spring 500 is a relatively common component of the insulator, and its structure and working principle are not described in detail here.

[0058] In some embodiments of the present invention, Figure 5 As shown, along the axial direction of the flange ring 100 , the projection of the annular shielding spring 500 is located outside the projections of all the conductor inserts 300 . This arrangement makes the shielding effect of the annular shielding spring 500 better.

[0059] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, along the axial direction of the flange ring 100, the projection of the second sealing groove 203 is located outside the projection of the annular shielding spring 500. With such a configuration, when the pot-type insulator is installed on the GIS equipment, the second sealing ring can have a certain sealing effect on the annular shielding spring 500, further preventing external water from contacting the annular shielding spring 500 and damaging the annular shielding spring 500.

[0060] In some embodiments of the present invention, Figure 4As shown, the minimum distance between the center line of the annular shielding spring 500 and the axis of the conductor insert 300 is L, which satisfies: 176mm≤L≤178mm. For example, the minimum distance between the center line of the annular shielding spring 500 and the axis of the conductor insert 300 can be 176mm, 177mm, 178mm or other suitable sizes. Based on the electromagnetic field theory and using ANSYS EDT software to analyze the electric field strength of the pot insulator, the electric field of the pot insulator along the tangent direction of the end face of the insulator body 200 and the electric field near the annular shielding spring 500 are calculated when the minimum distance between the center line of the annular shielding spring 500 and the axis of the conductor insert 300 is different, as shown in Table 3, wherein the electric field of the pot insulator along the tangent direction of the end face of the insulator body 200 is less than or equal to 16.5KV / mm and the electric field near the annular shielding spring 500 is less than or equal to 14KV / mm.

[0061] Table 3

[0062]

[0063] As shown in Table 3, when the minimum distance between the center line of the annular shielding spring 500 and the axis line of the conductor insert 300 is larger, the tangential electric field of the pot-type insulator along the end surface of the insulator body 200 and the electric field near the annular shielding spring 500 are smaller. However, considering that the outer diameter of the pot-type insulator is constant, the minimum distance L between the center line of the annular shielding spring 500 and the axis line of the conductor insert 300 is set to: 176mm≤L≤178mm.

[0064] In some embodiments of the present invention, Figure 5 As shown, the flange ring 100 is provided with a mounting hole 105 corresponding to the connecting component 400, the outer end of the mounting hole 105 is provided with a first sinking platform, the inner end of the mounting hole 105 is provided with a second sinking platform, the connecting component 400 includes a first screw 401, a first sealing gasket 402, a connecting spring 403, a second screw 404, a connecting portion 405 and a second sealing gasket 406, the first screw 401 is threadedly connected in the mounting hole 105, the nut of the first screw 401 extends into the first sinking platform, the first sealing gasket 402 is sleeved on the outer side of the first screw 401, and The connecting spring 403 is clamped between the nut of the first screw 401 and the end face of the first sinker, and is located in the mounting hole 105 and connected to the first screw 401. The nut of the second screw 404 is connected to the end of the connecting spring 403 away from the first screw 401. The connecting portion 405 is connected to the annular shielding spring 500 and extends into the second sinker. The second screw 404 is threadedly connected to the connecting portion 405. The second sealing gasket 406 is sleeved on the outside of the second screw 404 and clamped between the nut of the second screw 404 and the connecting portion 405.

[0065] In this embodiment, the connection component 400 is configured in this way, which is not only convenient for assembly, but also provides a first sealing gasket 402 and a second sealing gasket 406 to ensure better sealing. In addition, the connection component 400 can also form a grounding circuit with the flange ring 100, thereby improving the insulation of the pot-type insulator and providing better safety. Finally, the connection spring 403 can also be squeezed against the two screws to prevent the first screw 401 and the second screw 404 from loosening and shaking, thereby making the annular shielding spring 500 more securely installed.

[0066] It should be noted that the connection assembly 400 may also be other structures, for example, it may be a connecting rod.

[0067] In some embodiments of the present invention, Figure 6 As shown, the flange ring 100 is attached with a sealing plate 106 on the outer side of the pouring port 103, one of the sealing plate 106 and the flange ring 100 is provided with a third sealing groove 107, the third sealing groove 107 surrounds the pouring port 103, a third sealing ring 108 is provided in the third sealing groove 107, a pressing plate 109 is attached to the side of the sealing plate 106 away from the third sealing ring 108, and the pressing plate 109 and the sealing plate 106 are connected to the flange ring 100 by fasteners. In this embodiment, such a configuration can greatly improve the sealing performance of the pouring port 103, and the practicality is better.

[0068] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A pot-type insulator, characterized in that: include: A flange ring, wherein an annular groove is provided on the inner peripheral wall of the flange ring, and the annular groove extends along the circumference of the flange ring; a plurality of clamping grooves are provided on a side of the annular groove away from the axial center line of the flange ring, and the plurality of clamping grooves are arranged along the circumference of the flange ring, and a side of at least one of the clamping grooves away from the axial center line of the flange ring penetrates to form a pouring port; The insulator body is an arc-shaped structure that arches upwards. The insulator body is installed in the annular groove. The outer peripheral wall of the insulator body is provided with a plurality of clamping parts corresponding to the clamping groove. The clamping parts are clamped in the clamping groove. The conductor insert is arranged on the insulator body.

2. The pot-type insulator according to claim 1, characterized in that: Along the direction close to the axial centerline of the flange ring, the two side walls of the annular groove extend inclined in directions away from each other, and the two opposite side walls of the groove extend inclined in directions away from each other, and the inclination angle of the side wall of the annular groove is equal to the inclination angle of the side wall of the groove.

3. The pot-type insulator according to claim 2, characterized in that: The inclination angle of the side wall of the annular groove is α, which satisfies: 14°≤α≤16°; and / or, The maximum outer diameter of the conductor insert is D, which satisfies: 99 mm ≤ D ≤ 101 mm.

4. The pot-type insulator according to any one of claims 1 to 3, characterized in that: The insulator body is provided with a convex portion corresponding to the conductor insert, the convex portion protrudes from the two end surfaces of the insulator body, the conductor insert is arranged in the convex portion, and arc-shaped chamfers are formed between the outer side wall of the convex portion and the two end surfaces of the insulator body.

5. The pot-type insulator according to any one of claims 1 to 3, characterized in that: Both end faces of the flange ring are provided with a first sealing groove, which extends along the circumference of the flange ring and is used to install a first sealing ring. Both edges of the end faces of the insulator body are provided with a second sealing groove, which extends along the circumference of the insulator body and is used to install a second sealing ring.

6. The pot-type insulator according to claim 5, characterized in that: The pot-type insulator also includes: A plurality of connection components are provided on the flange ring and arranged along the circumference of the flange ring; An annular shielding spring is arranged in the insulator body and extends along the circumference of the insulator body. The annular shielding spring is connected to a plurality of the connecting assemblies.

7. The pot-type insulator according to claim 6, characterized in that: Along the axial direction of the flange ring, the projection of the annular shielding spring is located outside the projections of all the conductor inserts, and the projection of the second sealing groove is located outside the projection of the annular shielding spring.

8. The pot-type insulator according to claim 6, characterized in that: The minimum distance between the center line of the annular shielding spring and the axial center line of the conductor insert is L, which satisfies: 176mm≤L≤178mm.

9. The pot-type insulator according to claim 6, characterized in that: The flange ring is provided with a mounting hole corresponding to the connecting assembly, the outer end of the mounting hole is provided with a first sinking platform, and the inner end of the mounting hole is provided with a second sinking platform, and the connecting assembly includes: A first screw, threadedly connected in the mounting hole, a nut of the first screw extending into the first sinker; A first sealing gasket is sleeved on the outer side of the first screw and clamped between the nut of the first screw and the end surface of the first sinker; a connecting spring, located in the mounting hole and connected to the first screw; a second screw, a nut of the second screw being connected to an end of the connecting spring away from the first screw; A connecting portion, connected to the annular shielding spring and extending into the second sink, wherein the second screw is threadedly connected to the connecting portion; The second sealing gasket is sleeved on the outer side of the second screw and clamped between the nut of the second screw and the connecting portion.

10. The pot-type insulator according to any one of claims 1 to 3, characterized in that: The flange ring is provided with a sealing plate on the outer side of the pouring port, and one of the sealing plate and the flange ring is provided with a third sealing groove, the third sealing groove surrounds the pouring port, a third sealing ring is provided in the third sealing groove, and a pressure plate is provided on the side of the sealing plate facing away from the third sealing ring, and both the pressure plate and the sealing plate are connected to the flange ring through fasteners.

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