Arrester with fixed series gap

Abstract

The present invention provides a lightning arrester with a fixed series gap, comprising a first conductive block (10), a first electrode (21), an insulating member (31), a second conductive block (32), a second electrode (22), a nonlinear resistor (33), an end conductor (40), a plurality of support rods (50) and an insulating jacket (60). The first conductive block, the insulating member, the second conductive block, the nonlinear resistor and the end conductor are stacked in sequence along an assembly direction (A). The support rod extends along the assembly direction. One end of the support rod is connected to the first conductive block, and the other end is connected to the end conductor. A plurality of support rods are arranged around the insulating member, the second conductive block and the nonlinear resistor in a circumferential direction perpendicular to the assembly direction. The insulating jacket is wrapped around the circumferential outer side of the first conductive block, the insulating member, the second conductive block, the nonlinear resistor and the end conductor. The support rod is embedded in the insulating jacket. The lightning arrester with a fixed series gap has a high structural strength.

Description

Technical Field

[0001] The invention relates to a lightning arrester, in particular to a lightning arrester with a fixed series gap. Background Art

[0002] At present, the structural strength of the arrester with a fixed series gap is mainly maintained by an insulating support sleeve wrapped around the outside of the core body. However, the supporting performance of the insulating support sleeve is not ideal. Summary of the invention

[0003] The object of the present invention is to provide a lightning arrester with a fixed series gap, which has a higher structural strength.

[0004] The present invention provides a lightning arrester with a fixed series gap, which includes a first conductive block, a first electrode, an insulating member, a second conductive block, a second electrode, a nonlinear resistor, an end conductor, a plurality of support rods and an insulating jacket. The first electrode is connected to the first conductive block. The insulating member is arranged on one side of the first conductive block along an assembly direction. The second conductive block is arranged on the side of the insulating member away from the first conductive block along the assembly direction. The second electrode is connected to the second conductive block. A series gap is formed between the first electrode and the second electrode. The nonlinear resistor is arranged on the side of the second conductive block away from the insulating member along the assembly direction. The end conductor is arranged on the side of the nonlinear resistor away from the second conductive block along the assembly direction. The support rod extends along the assembly direction. One end of the support rod is connected to the first conductive block, and the other end is connected to the end conductor. A plurality of support rods are arranged around the insulating member, the second conductive block and the nonlinear resistor in a circumferential direction perpendicular to the assembly direction. The insulating jacket is wrapped around the circumferential outer side of the first conductive block, the insulating member, the second conductive block, the nonlinear resistor and the end conductor. A plurality of support rods are embedded in the insulating jacket.

[0005] In the arrester with a fixed series gap, the first conductive block, the end conductor, the support rod and the insulating jacket form a stable support structure, so that the arrester has a higher structural strength.

[0006] In another exemplary embodiment of the arrester with a fixed series gap, the first conductive block has a plurality of first positioning grooves extending along the assembly direction. The end conductor has a plurality of second positioning grooves extending along the assembly direction. One end of each support rod is inserted into a first positioning groove, and the other end is inserted into a second positioning groove. The groove wall of the first positioning groove and the groove wall of the second positioning groove both form an interference fit with the support rod. The structure is simple and easy to assemble.

[0007] In another exemplary embodiment of the arrester with a fixed series gap, the first electrode is superimposed on a side of the first conductive block away from the insulating member along the assembly direction. The arrester with a fixed series gap also includes a first conductive bolt and a first fastening nut. The first conductive bolt is passed through the first electrode and the first conductive block along the assembly direction. The nut of the first conductive bolt is located on the opposite side of the first conductive block from the first electrode along the assembly direction. The first fastening nut is threadedly connected to the first conductive bolt and can clamp the first conductive block and the first electrode with the nut of the first conductive bolt. This structure can facilitate the assembly of the arrester.

[0008] In another exemplary embodiment of the arrester with a fixed series gap, the first conductive block has a first assembly groove at one end away from the first electrode along the assembly direction. The nut of the first conductive bolt is located in the first assembly groove. The groove wall of the first assembly groove can abut against the nut of the first conductive bolt to prevent the first conductive bolt from rotating relative to the first conductive block. This structure can facilitate the assembly of the arrester.

[0009] In another exemplary embodiment of the arrester with a fixed series gap, the arrester with a fixed series gap further comprises a first pad. The first pad is embedded in the first assembly groove and arranged between the first conductive block and the insulating member along the assembly direction, thereby facilitating improvement of structural strength.

[0010] In another exemplary embodiment of the arrester with a fixed series gap, the first conductive block has a first plug-in structure at one end close to the first electrode along the assembly direction. The first electrode has a second plug-in structure on the side wall facing the first conductive block along the assembly direction. The first plug-in structure and the second plug-in structure are plugged together along the assembly direction to limit the relative movement of the first conductive block and the first electrode along a direction perpendicular to the assembly direction. By providing the first plug-in structure and the second plug-in structure, the relative movement of the first conductive block and the first electrode along a direction perpendicular to the assembly direction can be limited, thereby fixing the extension angle and direction of the first electrode relative to the first conductive block.

[0011] In another exemplary embodiment of the arrester with a fixed series gap, one of the first plug-in structure and the second plug-in structure is configured as a slot, and the other of the first plug-in structure and the second plug-in structure is configured as an insert matching the shape of the slot. This structure is simple and easy to process.

[0012] In another schematic embodiment of the arrester with a fixed series gap, the arrester with a fixed series gap further includes a second conductive bolt, a second fastening nut and a second spacer. The second conductive bolt is inserted into the end conductor along the assembly direction. The second conductive bolt has a nut at one end close to the nonlinear resistor body along the assembly direction. The second fastening nut is threadedly connected to the second conductive bolt and can clamp the end conductor with the nut of the second conductive bolt. The end of the end conductor close to the nonlinear resistor body along the assembly direction has a second assembly groove. The nut of the second conductive bolt is located in the second assembly groove. The groove wall of the second assembly groove can abut against the nut of the second conductive bolt to prevent the second conductive bolt from rotating relative to the end conductor. The second spacer is embedded in the second assembly groove and is arranged between the nonlinear resistor body and the end conductor along the assembly direction. This helps to improve the structural strength.

[0013] In another exemplary embodiment of the arrester with a fixed series gap, the nonlinear resistor body includes a plurality of zinc oxide varistor sheets stacked along an assembly direction.

[0014] In another exemplary embodiment of the arrester with a fixed series gap, a plurality of sheds arranged along the assembly direction are protruding from the surface of the insulating jacket. The sheds are in the shape of a ring extending in a circumferential direction perpendicular to the assembly direction. The insulating jacket is an integrally formed structure. Providing the sheds can increase the creepage distance of the arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings are only used to schematically illustrate and explain the present invention, and do not limit the scope of the present invention.

[0016] Figure 1 The present invention is a cross-sectional structural schematic diagram of an illustrative implementation of a lightning arrester with a fixed series gap.

[0017] Figure 2 for Figure 1 A schematic diagram of a partial structure of a lightning arrester with a fixed series gap is shown.

[0018] Figure 3 for Figure 1 A schematic diagram of a partial structure of a lightning arrester with a fixed series gap is shown.

[0019] Figure 4 For along Figure 1 Cross-sectional view of section IV-IV.

[0020] Description of symbols

[0021] 10 First conductive block

[0022] 11 First positioning groove

[0023] 12 First mounting groove

[0024] 13. First plug-in structure

[0025] 21. First electrode

[0026] 211 second plug-in structure

[0027] 22. Second electrode

[0028] 31 Insulation

[0029] 32 second conductive block

[0030] 33 Nonlinear resistor

[0031] 331 Zinc Oxide Varistor

[0032] 40 End conductor

[0033] 41 Second positioning slot

[0034] 42 Second mounting groove

[0035] 50 Support rod

[0036] 60 Insulation Jacket

[0037] 61 Umbrella Skirt

[0038] 71 First conductive bolt

[0039] 72 First fastening nut

[0040] 73 Second conductive bolt

[0041] 74 Second fastening nut

[0042] 81 First pad

[0043] 82 Second pad

[0044] A. Assembly direction DETAILED DESCRIPTION

[0045] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings. The same reference numerals in the drawings represent components with the same structure or similar structures but the same functions.

[0046] In this document, “exemplary” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “exemplary” should not be interpreted as a more preferred or more advantageous technical solution.

[0047] In this article, "first", "second", etc. do not indicate their importance or order, but are only used to indicate the difference between each other for the convenience of document description.

[0048] In order to simplify the drawings, each figure only schematically shows the parts related to the present invention, which do not represent the actual structure of the product.

[0049] Figure 1 FIG. 1 is a cross-sectional structural diagram of an exemplary embodiment of a lightning arrester with a fixed series gap. Figure 1 As shown, the arrester with a fixed series gap includes a first conductive block 10, a first electrode 21, an insulating member 31, a second conductive block 32, a second electrode 22, a nonlinear resistor 33, an end conductor 40, twelve support rods 50 ( Figure 1 Only two of them can be seen in the figure) and an insulating jacket 60. The first conductive block 10 is used to be electrically connected to the high-voltage conductor; the end conductor 40 is used to be electrically connected to the supporting cross arm of the power tower.

[0050] Figure 2 for Figure 1 A schematic diagram of a partial structure of a lightning arrester with a fixed series gap is shown, wherein the insulating jacket 60 is not shown. Figure 3 for Figure 1 The schematic diagram of a partial structure of a lightning arrester with a fixed series gap is shown, wherein a first conductive block 10, an end conductor 40 and a support rod 50 are shown. Figure 4 For along Figure 1 Cross-sectional view of section IV-IV.

[0051] like Figure 1 and Figure 2 As shown, the first conductive block 10, the insulating member 31, the second conductive block 32, the nonlinear resistor 33 and the end conductor 40 are stacked in sequence along an assembly direction A. The insulating member 31, the second conductive block 32 and the nonlinear resistor 33 are, for example, coaxially arranged cylindrical shapes. The insulating member 31 is used to isolate the first conductive block 10 and the second conductive block 32, so that the first conductive block 10 and the second conductive block 32 cannot contact and conduct electricity during normal use. The second conductive block 32 and the nonlinear resistor 33 can contact and conduct electricity, and the nonlinear resistor 33 and the end conductor 40 can conduct electricity. The first electrode 21 is connected to the first conductive block 10. The second electrode 22 is connected to the second conductive block 32. A series gap is formed between the first electrode 21 and the second electrode 22. The nonlinear resistor 33, for example, includes a plurality of zinc oxide varistors 331 stacked along the assembly direction A.

[0052] like Figures 1 to 3 As shown, each support rod 50 extends along the assembly direction A. One end of the support rod 50 is connected to the first conductive block 10, and the other end is connected to the end conductor 40. Figure 2 and Figure 4As shown, twelve support rods 50 are evenly arranged around the insulating member 31, the second conductive block 32 and the nonlinear resistor 33 in a circumferential direction perpendicular to the assembly direction A. The support rods 50 are made of an insulating material and have a certain strength. The insulating material is, for example, glass fiber and epoxy resin. In other exemplary embodiments, the number of the support rods 50 can be adjusted as needed, such as four, eight or ten.

[0053] Specifically, Figure 1 As shown, in this exemplary embodiment, the first conductive block 10 has several first positioning grooves 11 extending along the assembly direction A. The end conductor 40 has several second positioning grooves 41 extending along the assembly direction A. One end of each support rod 50 is inserted in a first positioning groove 11, and the other end is inserted in a second positioning groove 41. The groove wall of the first positioning groove 11 and the groove wall of the second positioning groove 41 both form an interference fit with the support rod 50 to prevent the support rod 50 from moving relative to the first conductive block 10 and the end conductor 40, thereby facilitating the relative positions of the first conductive block 10, the insulating member 31, the second conductive block 32, the nonlinear resistor 33 and the end conductor 40 along the assembly direction A to remain unchanged, so as to ensure the electrical performance of the arrester. During the assembly process of the arrester, the support rod 50, for example, after being inserted into the first positioning groove 11 and the second positioning groove 41, forms an interference fit with the groove wall of the first positioning groove 11 and the groove wall of the second positioning groove 41 by crimping.

[0054] like Figure 1 As shown, the insulating jacket 60 is wrapped around the circumferential outer side of the first conductive block 10, the insulating member 31, the second conductive block 32, the nonlinear resistor 33 and the end conductor 40, wherein the circumferential direction is the circumferential direction perpendicular to the assembly direction A. The support rod 50 is embedded in the insulating jacket 60. The insulating jacket 60 is made of, for example, silicone rubber. In the production process of the lightning arrester, the insulating jacket 60 is, for example, formed as a whole after the other components are assembled, but is not limited to this. In an exemplary embodiment, the surface of the insulating jacket 60 is protrudingly provided with a plurality of umbrella skirts 61 arranged along the assembly direction A. The umbrella skirt 61 is in the shape of a ring extending in a circumferential direction perpendicular to the assembly direction A. Providing an umbrella skirt can increase the creepage distance of the lightning arrester.

[0055] Under the action of lightning overvoltage, the series gap is instantly broken down, the lightning arrester presents low impedance, and discharges the lightning current into the ground; after the lightning strike, the power frequency voltage is loaded on the lightning arrester, the resistance of the lightning arrester instantly increases, the insulation of the series gap is restored, and the arc is naturally extinguished in a short time.

[0056] In the arrester with a fixed series gap, the first conductive block 10, the end conductor 40, the support rod 50 and the insulating jacket 60 form a stable support structure, so that the arrester has a higher structural strength.

[0057] like Figure 1As shown, in the exemplary embodiment, the first electrode 21 is superimposed on the side of the first conductive block 10 away from the insulating member 31 along the assembly direction A. The arrester with a fixed series gap also includes a first conductive bolt 71 and a first fastening nut 72. The first conductive bolt 71 is passed through the first electrode 21 and the first conductive block 10 along the assembly direction A. When in use, the first conductive bolt 71 is used to connect the high-voltage wire. The nut of the first conductive bolt 71 is located on the opposite side of the first conductive block 10 from the first electrode 21 along the assembly direction A. The first fastening nut 72 is threadedly connected to the first conductive bolt 71 and can clamp the first conductive block 10 and the first electrode 21 with the nut of the first conductive bolt 71. This structure can facilitate the assembly of the arrester.

[0058] like Figure 1 As shown, in the exemplary embodiment, the first conductive block 10 has a first assembly groove 12 at one end away from the first electrode 21 along the assembly direction A. The nut of the first conductive bolt 71 is located in the first assembly groove 12. The groove wall of the first assembly groove 12 can abut against the nut of the first conductive bolt 71 to prevent the first conductive bolt 71 from rotating relative to the first conductive block 10. This can facilitate the assembly of the arrester.

[0059] like Figure 1 As shown, in the exemplary embodiment, the arrester with a fixed series gap further includes a conductive first pad 81. The first pad 81 is embedded in the first assembly groove 12 and is arranged between the first conductive block 10 and the insulating member 31 along the assembly direction A. This helps to improve the structural strength.

[0060] like Figure 1 As shown, in the schematic embodiment, the first conductive block 10 has a first plug structure 13 at one end close to the first electrode 21 along the assembly direction A. The first electrode 21 has a second plug structure 211 along the assembly direction A toward the side wall of the first conductive block 10. The first plug structure 13 and the second plug structure 211 are plugged together along the assembly direction A to limit the relative movement of the first conductive block 10 and the first electrode 21 along the direction perpendicular to the assembly direction A. Specifically, in this schematic embodiment, the first plug structure 13 is set as a slot, and the second plug structure 211 is set as a plug block matching the shape of the slot. However, it is not limited to this. In other schematic embodiments, the second plug structure 211 can also be set as a slot, and the first plug structure 13 can be set as a plug block matching the shape of the slot. By setting the first plug structure and the second plug structure, the relative movement of the first conductive block and the first electrode along the direction perpendicular to the assembly direction can be limited, thereby fixing the extension angle and direction of the first electrode relative to the first conductive block.

[0061] like Figure 1As shown, in the schematic embodiment, the arrester with a fixed series gap further includes a second conductive bolt 73, a second fastening nut 74 and a conductive second spacer 82. The second conductive bolt 73 is inserted into the end conductor 40 along the assembly direction A. When in use, the second conductive bolt 73 is used to connect the supporting cross arm of the electric tower. The second conductive bolt 73 has a nut at one end close to the nonlinear resistor body 33 along the assembly direction A. The second fastening nut 74 is threadedly connected to the second conductive bolt 73 and can clamp the end conductor 40 with the nut of the second conductive bolt 73. The end conductor 40 has a second assembly groove 42 at one end close to the nonlinear resistor body 33 along the assembly direction A. The nut of the second conductive bolt 73 is located in the second assembly groove 42. The groove wall of the second assembly groove 42 can abut against the nut of the second conductive bolt 73 to prevent the second conductive bolt 73 from rotating relative to the end conductor 40, thereby facilitating the assembly of the arrester. The second cushion block 82 is embedded in the second assembly groove 42 and disposed between the nonlinear resistor 33 and the end conductor 40 along the assembly direction A to improve the structural strength.

[0062] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0063] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation scheme or changes that do not deviate from the technical spirit of the present invention, such as combination, division or repetition of features, should be included in the scope of protection of the present invention.

Claims

1. A lightning arrester with a fixed series gap, characterized in that: include: a first conductive block (10); a first electrode (21), connected to the first conductive block (10); an insulating member (31) arranged on one side of the first conductive block (10) along an assembly direction (A); a second conductive block (32) arranged along the assembly direction (A) on a side of the insulating member (31) facing away from the first conductive block (10); a second electrode (22) connected to the second conductive block (32), wherein a series gap is formed between the first electrode (21) and the second electrode (22); a nonlinear resistor (33) arranged along the assembly direction (A) on a side of the second conductive block (32) facing away from the insulating member (31); an end conductor (40) disposed along the assembly direction (A) on a side of the nonlinear resistor (33) facing away from the second conductive block (32); a plurality of support rods (50), the support rods (50) extending along the assembly direction (A), one end of the support rod (50) connected to the first conductive block (10), and the other end connected to the end conductor (40), the plurality of support rods (50) being arranged around the insulating member (31), the second conductive block (32) and the nonlinear resistor (33) in a circumferential direction perpendicular to the assembly direction (A); and an insulating jacket (60) wrapped around the circumferential outer side of the first conductive block (10), the insulating member (31), the second conductive block (32), the nonlinear resistor (33) and the end conductor (40), wherein a plurality of the support rods (50) are embedded in the insulating jacket (60). The first conductive block (10) has a first plug-in structure (13) at one end thereof close to the first electrode (21) along the assembly direction (A), and the first electrode (21) has a second plug-in structure (211) at a side wall thereof facing the first conductive block (10) along the assembly direction (A). The first plug-in structure (13) and the second plug-in structure (211) are plug-fitted together along the assembly direction (A) to limit relative movement of the first conductive block (10) and the first electrode (21) along a direction perpendicular to the assembly direction (A).

2. The arrester with a fixed series gap according to claim 1, characterized in that: The first conductive block (10) has a plurality of first positioning grooves (11) extending along the assembly direction (A), the end conductor (40) has a plurality of second positioning grooves (41) extending along the assembly direction (A), one end of each support rod (50) is inserted into one of the first positioning grooves (11), and the other end is inserted into one of the second positioning grooves (41), and the groove walls of the first positioning grooves (11) and the groove walls of the second positioning grooves (41) both form an interference fit with the support rod (50).

3. The arrester with a fixed series gap according to claim 1, characterized in that: The first electrode (21) is stacked on a side of the first conductive block (10) away from the insulating member (31) along the assembly direction (A), and the lightning arrester with a fixed series gap further comprises: a first conductive bolt (71) which passes through the first electrode (21) and the first conductive block (10) along the assembly direction (A), the nut of the first conductive bolt (71) being located on the opposite side of the first conductive block (10) from the first electrode (21) along the assembly direction (A); and A first fastening nut (72) is threadedly connected to the first conductive bolt (71) and is capable of clamping the first conductive block (10) and the first electrode (21) together with the nut of the first conductive bolt (71).

4. The arrester with a fixed series gap according to claim 3, characterized in that: The first conductive block (10) has a first assembly groove (12) at one end thereof facing away from the first electrode (21) along the assembly direction (A); the nut of the first conductive bolt (71) is located in the first assembly groove (12); and the groove wall of the first assembly groove (12) can abut against the nut of the first conductive bolt (71) to prevent the first conductive bolt (71) from rotating relative to the first conductive block (10).

5. The arrester with a fixed series gap according to claim 4, characterized in that: The arrester with a fixed series gap further comprises a first cushion block (81), wherein the first cushion block (81) is embedded in the first assembly groove (12) and is arranged between the first conductive block (10) and the insulating member (31) along the assembly direction (A).

6. The arrester with a fixed series gap according to claim 1, characterized in that: One of the first plug-in structure (13) and the second plug-in structure (211) is configured as a slot, and the other of the first plug-in structure (13) and the second plug-in structure (211) is configured as an insert block matching the shape of the slot.

7. The arrester with a fixed series gap according to claim 1, characterized in that: The arrester with a fixed series gap also includes: a second conductive bolt (73) which is inserted through the end conductor (40) along the assembly direction (A), and the second conductive bolt (73) has a nut at one end thereof which is close to the nonlinear resistor (33) along the assembly direction (A); a second fastening nut (74) which is threadedly connected to the second conductive bolt (73) and can clamp the end conductor (40) with the nut of the second conductive bolt (73); the end conductor (40) has a second assembly groove (42) at one end close to the nonlinear resistor (33) along the assembly direction (A); the nut of the second conductive bolt (73) is located in the second assembly groove (42); the groove wall of the second assembly groove (42) can abut against the nut of the second conductive bolt (73) to prevent the second conductive bolt (73) from rotating relative to the end conductor (40); and A second cushion block (82) is embedded in the second assembly groove (42) and is arranged between the nonlinear resistor (33) and the end conductor (40) along the assembly direction (A).

8. The arrester with a fixed series gap according to claim 1, characterized in that: The nonlinear resistor body (33) comprises a plurality of zinc oxide varistor sheets (331) stacked along the assembly direction (A).

9. The arrester with a fixed series gap according to claim 1, characterized in that: The surface of the insulating jacket (60) is protrudingly provided with a plurality of sheds (61) arranged along the assembly direction (A); the sheds (61) are in the shape of a ring extending in a circumferential direction perpendicular to the assembly direction (A); and the insulating jacket (60) is an integrally formed structure.

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