High-voltage isolator

Abstract

The utility model belongs to the technical field of high-voltage insulation, and discloses a high-voltage isolator. The high-voltage isolator comprises an insulator, a connecting assembly and a shielding assembly, two ends of the insulator are shielding ends, the connecting assembly comprises a flange and connecting pieces, the two shielding ends are connected with the connecting pieces, one end, far away from the insulator, of each connecting piece is connected with the flange, and the flange is used for connecting the insulator with power equipment so as to fix the insulator; the shielding assembly comprises inner shielding rings and outer shielding rings, each shielding end is internally sleeved with the corresponding inner shielding ring, each shielding end is sleeved with the corresponding outer shielding ring, the inner shielding rings are fixed to the inner side of the connecting piece in a lap joint mode, and the outer shielding rings are fixed to the outer side of the connecting piece in a lap joint mode, so that installation of the inner shielding rings and the outer shielding rings is achieved; the inner and outer three-phase points of the shielding end are respectively shielded through the inner shielding ring and the outer shielding ring, and the electric field intensity of the shielding end can be reduced, so that the high-voltage resistance of the insulator is improved, and the service life of the high-voltage isolator is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage insulation, in particular to a high-voltage isolator. Background Art

[0002] During the transmission of high-voltage current, due to the high voltage and long transmission distance, in order to reduce the weight and heat dissipation of the high-voltage line, bare wires without insulation are usually used, and multiple towers are set up on the transmission path to support the high-voltage line. In order to prevent the high-voltage current from flowing to the ground through the tower, a high-voltage isolator needs to be installed on the tower to isolate the current conduction between the high-voltage line and the tower.

[0003] The ceramic tube of the existing high-voltage isolator is connected to the flange through a kovar, and has poor insulation performance and is easily broken down by high voltage, resulting in the high-voltage isolator being larger in size, having poor high-voltage resistance, having a short service life and easily causing safety hazards.

[0004] Therefore, it is urgent to propose a high voltage isolator to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a high-voltage isolator, which can improve the insulation performance of the high-voltage isolator, thereby improving its high-voltage resistance performance, improving safety and extending its service life, and can reduce the size of the high-voltage isolator.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A high voltage isolator, comprising:

[0008] An insulator, wherein both ends of the insulator are shielding ends;

[0009] A connecting assembly, the connecting assembly comprising a flange and a connecting piece, the two shielding ends are connected to the connecting piece, one end of the connecting piece away from the insulator is connected to the flange, and the flange is used to connect the insulator to the power equipment;

[0010] The shielding assembly includes an inner shielding ring and an outer shielding ring. The inner shielding ring is inserted into the interior of each shielding end and is overlapped and fixed to the inner side of the connecting piece. The outer shielding ring is sleeved on the outer side of each shielding end and is overlapped and fixed to the outer side of the connecting piece.

[0011] Furthermore, the inner shielding ring is provided with a plurality of guide holes along the circumferential direction.

[0012] Furthermore, the sum of the opening areas of the plurality of guide holes is S1, the cross-sectional area of ​​the gap between the outer side of the inner shielding ring and the inner side of the shielding end is S2, and S1>S2.

[0013] Furthermore, the inner shielding ring comprises a first ring portion and a second ring portion connected at an angle, the first ring portion is overlapped and fixed to the inner side of the corresponding connecting member, and the second ring portion is passed through the inside of the corresponding shielding end;

[0014] The outer shielding ring comprises a third ring portion, one end of which is overlapped and fixed on the outer side of the corresponding connecting member, and the third ring portion is sleeved on the outer side of the corresponding shielding end.

[0015] Furthermore, the edge of the second ring portion away from the first ring portion is bent inwardly to form a first flange, and the first flange is in transition with the rounded corner of the second ring portion;

[0016] The edge of the third ring portion away from the connecting member is bent outward to form a second flange, and the second flange is in transition with the rounded corner of the third ring portion.

[0017] Furthermore, the distance between the first flange and the inner side surface of the second ring portion is 3 mm to 6 mm; the distance between the second flange and the outer side surface of the third ring portion is 3 mm to 6 mm.

[0018] Furthermore, the first ring portion is spot welded to the inner side of the corresponding connecting piece; and the third ring portion is spot welded to the outer side of the corresponding connecting piece.

[0019] Furthermore, the connection assembly also includes a transition piece, one end of which is connected to an end of the connection piece away from the insulator, and the other end of the transition piece is connected to the flange.

[0020] Further, one end of the transition piece is laser welded to the corresponding connecting piece; and / or,

[0021] The other end of the transition piece is sealed and connected to the corresponding flange by argon arc welding.

[0022] Furthermore, the connecting piece is a Kovar alloy piece.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides a high-voltage isolator, comprising an insulator, a connecting assembly and a shielding assembly, wherein two ends of the insulator are shielding ends, the connecting assembly comprises a flange and a connecting piece, both shielding ends are connected with the connecting piece, one end of the connecting piece away from the insulator is connected with the flange, and the flange is used to connect the insulator to the power equipment, so as to fix the insulator; the shielding assembly comprises an inner shielding ring and an outer shielding ring, the inner part of each shielding end is sleeved with the inner shielding ring, the outer side of each shielding end is sleeved with the outer shielding ring, and the inner shielding ring is overlapped and fixed to the inner side of the connecting piece, and the outer shielding ring is overlapped and fixed to the outer side of the connecting piece, so as to realize the installation of the inner shielding ring and the outer shielding ring; the inner and outer three-phase points of the shielding end are respectively shielded by the inner shielding ring and the outer shielding ring, so as to reduce the electric field strength of the shielding end, so as to improve the high-voltage resistance performance of the insulator, thereby improving the safety of the high-voltage isolator and prolonging the service life, and making the insulator with a smaller size have better insulation performance, so as to reduce the volume of the high-voltage isolator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the high voltage shield provided by the utility model;

[0026] Figure 2 It is a cross-sectional view of the high-voltage shield provided by the utility model;

[0027] Figure 3 It is a structural schematic diagram of the inner shielding ring of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the outer shielding ring of the utility model;

[0029] Figure 5 It is a structural schematic diagram of the connecting piece of the utility model.

[0030] In the figure:

[0031] 1. Insulator;

[0032] 2. Connecting assembly; 21. Flange; 22. Connecting piece; 221. Second horizontal ring portion; 222. Third vertical ring portion; 223. Fourth vertical ring portion; 23. Transition piece;

[0033] 3. Shielding assembly; 31. Inner shielding ring; 311. First ring portion; 312. Second ring portion; 313. Air guide hole; 314. First flange; 32. Outer shielding ring; 321. Third ring portion; 322. Second flange. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] like Figure 1 and Figure 2As shown, this embodiment provides a high-voltage isolator, including an insulator 1, a connecting assembly 2 and a shielding assembly 3, the two ends of the insulator 1 are shielding ends, the connecting assembly 2 includes a flange 21 and a connecting piece 22, the two shielding ends are connected to the connecting piece 22, the end of the connecting piece 22 away from the insulator 1 is connected to the flange 21, and the flange 21 is used to connect the insulator 1 to the power equipment, so as to fix the insulator 1; the shielding assembly 3 includes an inner shielding ring 31 and an outer shielding ring 32, the inner shielding ring 31 is sleeved inside each shielding end, the outer shielding ring 32 is sleeved outside each shielding end, and the inner shielding ring 31 is overlapped The outer shielding ring 32 is fixed to the inner side of the connector 22 and overlapped and fixed to the outer side of the connector 22 to realize the installation of the inner shielding ring 31 and the outer shielding ring 32; the inner and outer three-phase points of the shielding end are shielded by the inner shielding ring 31 and the outer shielding ring 32 respectively, which can reduce the electric field strength of the shielding end to improve the high-voltage resistance of the insulator 1, thereby improving the safety of the high-voltage isolator and extending its service life, and abolishing the method of improving the high-voltage resistance by extending the length of the insulator 1, so that the insulator 1 with a smaller size can have better insulation performance, thereby reducing the volume of the high-voltage isolator.

[0039] It should be noted that the high-voltage isolator needs to be processed to a vacuum state after assembly. In order to prevent the inner shielding ring 31 from affecting the speed and vacuum effect of the vacuum pumping inside the insulator 1, the inner shielding ring 31 is provided with a plurality of guide holes 313 along the circumferential direction so that all gas molecules or ions in the gap between the inner shielding ring 31 and the insulator 1 can be completely extracted, thereby further improving the high-voltage resistance performance of the insulator 1.

[0040] Furthermore, the sum of the opening areas of the multiple guide holes 313 is S1, the cross-sectional area of ​​the gap between the outer side of the inner shielding ring 31 and the inner side of the shielding end is S2, and S1>S2, so as to avoid the inner shielding ring 31 blocking the gas flow inside the insulator 1, thereby improving the speed and vacuum degree of vacuuming inside the insulator 1.

[0041] like Figure 3 and Figure 4 As shown, the inner shielding ring 31 includes a first ring portion 311 and a second ring portion 312 connected at an angle, the first ring portion 311 is overlapped and fixed to the inner side of the corresponding connector 22, and the second ring portion 312 is inserted into the inside of the corresponding shielding end; the outer shielding ring 32 includes a third ring portion 321, one end of the third ring portion 321 is overlapped and fixed to the outer side of the corresponding connector 22, and the third ring portion 321 is sleeved on the outer side of the corresponding shielding end. The inner and outer three-phase points of the shielding end are shielded by the second ring portion 312 and the third ring portion 321 respectively, which can reduce the electric field strength of the shielding end, thereby significantly improving the high voltage resistance performance of the insulator 1. Among them, the inner shielding ring 31 and the outer shielding ring 32 include but are not limited to being made of metal materials such as stainless steel, which is not limited here.

[0042] In a high-voltage electric field, the end of the conductor is prone to tip discharge. Therefore, the edge of the second ring portion 312 away from the first ring portion 311 is bent inward to form a first flange 314, and the first flange 314 and the second ring portion 312 have a rounded transition. The edge of the third ring portion 321 away from the connector 22 is bent outward to form a second flange 322, and the second flange 322 and the third ring portion 321 have a rounded transition to avoid tip discharge between the inner shielding ring 31 and the outer shielding ring 32.

[0043] Furthermore, the spacing between the first flange 314 and the inner side of the second ring portion 312 is 3mm to 6mm, so that the transition fillet size between the first flange 314 and the second ring portion 312 is large enough to avoid tip discharge under the premise that the inner shielding ring 31 does not affect the gas flow inside the insulator 1. Similarly, the spacing between the second flange 322 and the outer side of the third ring portion 321 is 3mm to 6mm. Under the premise of minimizing the size of the outer shielding ring 32, the second flange 322 and the third ring portion 321 have a sufficient fillet transition distance to avoid tip discharge, while reducing the volume and production cost of the high-voltage shield.

[0044] like Figure 5 As shown, the connector 22 includes a second horizontal ring portion 221, a third vertical ring portion 222 and a fourth vertical ring portion 223. The third vertical ring portion 222 is arranged around the circumference of the second horizontal ring portion 221, and the third vertical ring portion 222 is connected to the second horizontal ring portion 221 at an angle. The fourth horizontal ring portion is vertically arranged on a side of the second horizontal ring portion 221 away from the third vertical ring portion 222, and the inner diameter of the third vertical ring portion 222 is greater than or equal to the outer diameter of the corresponding shielding end. When the connector 22 is installed with the corresponding shielding end, the first ring portion 311 of the inner shielding ring 31 is first overlapped and fixed to the second horizontal ring portion 221. The second horizontal ring portion 221 is then fixedly connected to the end of the shielding end. At this time, the inner shielding ring 31 is inserted into the inside of the shielding end, and the third vertical ring portion 222 is sleeved on the outside of the shielding end. Then the outer shielding ring 32 is sleeved on the outside of the shielding end, and one end of the third ring portion 321 of the outer shielding ring 32 is overlapped and fixed on the outside of the third vertical ring portion 222. The connection between the inner shielding ring 31, the outer shielding ring 32 and the insulator 1 can be completed through the connecting piece 22. Finally, the fourth vertical ring portion 223 of the connecting piece 22 is fixedly connected to the flange 21 to realize the installation of the high-voltage isolator.

[0045] Further, the connection between the inner shielding ring 31, the outer shielding ring 32 and the connector 22, the connection between the connector 22 and the insulator 1, and the connection between the connector 22 and the kovar are all welding to ensure the connection strength. Optionally, the connection between the inner shielding ring 31, the outer shielding ring 32 and the connector 22, the connection between the connector 22 and the insulator 1, and the connection between the connector 22 and the kovar can also be bonding or threaded connection, etc., which is not limited here.

[0046] It should be noted that since the insulator 1 is usually made of ceramic material, it is difficult to weld general metal materials thereto, so the connector 22 is a kovar alloy part. Kovar is a nickel-based metal material that can be stably connected to the ceramic material by welding and is commonly used for connecting ceramic materials with metal materials. In this embodiment, the connector 22 is connected to the shielding end by vacuum brazing to achieve welding between the ceramic material and the kovar material, and can improve the quality of the weld, thereby ensuring the connection strength and sealing effect between the insulator 1 and the kovar.

[0047] In order to improve the connection efficiency, the first ring portion 311 is spot welded to a side of the second horizontal ring portion 221 of the corresponding connector 22 close to the third vertical ring portion 222, so as to quickly and efficiently fix the inner shielding ring 31 to the connector 22. Similarly, the second horizontal ring portion 221 is spot welded to the outer side of the third vertical ring portion 222 of the corresponding connector 22, which will not be described in detail here.

[0048] Furthermore, the connecting assembly 2 also includes a transition piece 23, one end of the transition piece 23 is connected to an end of the fourth vertical ring portion 223 away from the insulator 1, and the other end of the transition piece 23 is connected to the flange 21, so as to facilitate the connection of the connecting piece 22 to the flange 21. By connecting the connecting piece 22 to the flange 21 through the transition piece 23, the use of cultivable materials is saved, which is conducive to reducing production costs.

[0049] Optionally, the transition piece 23 includes but is not limited to being made of metal materials such as stainless steel, which is easy to weld and has high material strength, and will not be elaborated here.

[0050] Specifically, one end of the transition piece 23 is laser welded to the corresponding connecting piece 22 . Laser welding is simple to operate and has high processing efficiency, and can ensure the connection strength and sealing effect between the transition piece 23 and the connecting piece 22 .

[0051] Furthermore, the other end of the transition piece 23 is sealed and connected to the corresponding flange 21 by argon arc welding, so as to facilitate the connection of the transition piece 23 to the inner wall of the flange 21 and improve the connection strength and sealing effect between the transition piece 23 and the flange 21.

[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A high voltage isolator, characterized in that: include: An insulator (1), wherein both ends of the insulator (1) are shielding ends; A connecting assembly (2), the connecting assembly (2) comprising a flange (21) and a connecting piece (22), the two shielding ends are both connected to the connecting piece (22), one end of the connecting piece (22) away from the insulator (1) is connected to the flange (21), and the flange (21) is used to connect the insulator (1) to the power equipment; The shielding assembly (3) comprises an inner shielding ring (31) and an outer shielding ring (32); the inner shielding ring (31) is inserted into the interior of each shielding end, and the inner shielding ring (31) is overlapped and fixed to the inner side of the connecting piece (22); the outer side of each shielding end is sleeved with the outer shielding ring (32), and the outer shielding ring (32) is overlapped and fixed to the outer side of the connecting piece (22).

2. The high voltage isolator according to claim 1, characterized in that: The inner shielding ring (31) is provided with a plurality of guide holes (313) along the circumferential direction.

3. The high voltage isolator according to claim 2, characterized in that: The sum of the opening areas of the plurality of guide holes (313) is S1, the cross-sectional area of ​​the gap between the outer side of the inner shielding ring (31) and the inner side of the shielding end is S2, and S1>S2.

4. The high voltage isolator according to claim 1, characterized in that: The inner shielding ring (31) comprises a first ring portion (311) and a second ring portion (312) connected at an angle, the first ring portion (311) being overlapped and fixed on the inner side of the corresponding connecting member (22), and the second ring portion (312) being passed through the interior of the corresponding shielding end; The outer shielding ring (32) comprises a third ring portion (321), one end of the third ring portion (321) is overlapped and fixed on the outer side of the corresponding connecting member (22), and the third ring portion (321) is sleeved on the outer side of the corresponding shielding end.

5. The high voltage isolator according to claim 4, characterized in that: The edge of the second ring portion (312) away from the first ring portion (311) is bent inward to form a first flange (314), and the first flange (314) and the second ring portion (312) are transitioned into a rounded corner; The edge of the third ring portion (321) away from the connecting member (22) is bent outward to form a second flange (322), and the second flange (322) and the third ring portion (321) are in a rounded transition.

6. The high voltage isolator according to claim 5, characterized in that: The distance between the first flange (314) and the inner side surface of the second ring portion (312) is 3 mm to 6 mm; the distance between the second flange (322) and the outer side surface of the third ring portion (321) is 3 mm to 6 mm.

7. The high voltage isolator according to claim 4, characterized in that: The first ring portion (311) is spot welded to the inner side of the corresponding connecting piece (22); and the third ring portion (321) is spot welded to the outer side of the corresponding connecting piece (22).

8. The high voltage isolator according to any one of claims 1 to 7, characterized in that: The connection assembly (2) further comprises a transition piece (23), one end of the transition piece (23) being connected to an end of the connection piece (22) away from the insulator (1), and the other end of the transition piece (23) being connected to the flange (21).

9. The high voltage isolator according to claim 8, characterized in that: One end of the transition piece (23) is laser welded to the corresponding connecting piece (22); and / or, The other end of the transition piece (23) is sealed and connected to the corresponding flange (21) by argon arc welding.

10. The high voltage isolator according to any one of claims 1 to 7, characterized in that: The connecting piece (22) is a Kovar alloy piece.

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