Lightning arrester and insulating pull rod thereof

Abstract

The utility model relates to a lightning arrester and an insulation pull rod thereof, the lightning arrester comprises the insulation pull rod, the insulation pull rod is a split type rod body, the split type rod body comprises a rod body first segment, a rod body second segment and a rod body third segment, the rod body first segment and the rod body third segment are metal rod bodies, and the rod body second segment and the rod body third segment are metal rod bodies. The second rod body section is an insulating rod body, the first rod body section is used for being connected with an upper gland of a lightning arrester core body through a metal nut, the third rod body section is used for being connected with a lightning arrester base through a metal nut, the first rod body section is fixedly connected with the second rod body section, and the second rod body section is fixedly connected with the third rod body section. Therefore, the insulation pull rod provided by the utility model can be ensured to have better insulativity, and meanwhile, the connection of the metal rod body and the metal nut can effectively prevent the matching damage of the insulation pull rod and the insulation pull rod nut possibly caused when the pull force applied to the insulation pull rod is too large, so that the normal service life of the lightning arrester is ensured.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester technology, and in particular to a surge arrester and its insulating tie rod. Background Technology

[0002] Surge arresters are a common type of overvoltage protection device in power systems. Their core component is the core body, which is located inside the arrester housing. The core body includes an insulating cylinder and multiple resistors stacked from top to bottom inside the insulating cylinder. To ensure good contact between the resistors, the end of the insulating cylinder is equipped with a spring that presses against the resistors. The large downward force provided by the spring presses the resistors together, ensuring good contact between them.

[0003] In the prior art, Chinese invention patent application with publication number CN118155963A and publication date of June 7, 2024 discloses a surge arrester core and a surge arrester. The surge arrester core of this invention includes an insulating pull rod, an upper pressure cover and a lower base are mounted on the insulating pull rod, and multiple resistors are stacked between the upper pressure cover and the lower base. A spring is provided between the resistors and the upper pressure cover, and a spring seat is provided between the spring and the resistors. The spring applies a large downward pressure to the spring seat, thereby pressing the multiple resistors together to ensure good contact between the multiple resistors.

[0004] As voltage levels increase, the number of resistors in surge arresters increases, requiring a greater downward force from the spring. This results in significant tension on the insulating rod. The insulating rod is typically made of epoxy resin, fiberglass, or polycarbonate, providing excellent insulation. However, when the insulating rod is subjected to excessive tension, the threads at the connection point between the rod and the metal insulating nut on the upper cover may be damaged or even pulled off. This can cause the surge arrester to malfunction, leading to damage to electrical equipment and increased safety hazards. Utility Model Content

[0005] The purpose of this invention is to provide an insulating tie rod to address the problem in existing technologies where excessive tension on the insulating tie rod can damage or even pull off the threads at the interface between the insulating tie rod and the insulating tie rod nut, leading to malfunction of the surge arrester, damage to electrical equipment, and increased safety hazards. This invention also aims to provide a surge arrester to solve the aforementioned problems.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution.

[0007] An insulating tie rod includes a split rod body, which comprises a first segment, a second segment, and a third segment. The first and third segments are metal rods, and the second segment is an insulating rod. The first segment is used to connect to the pressure cap on the surge arrester core via a metal nut, and the third segment is used to connect to the surge arrester base via a metal nut. The first segment is fixedly connected to the second, third, and fourth segments.

[0008] Furthermore, the first segment and the second segment of the rod, and / or the second segment and the third segment of the rod are connected by rectangular threads.

[0009] Furthermore, the two ends of the second segment of the rod along its length are configured with external rectangular threads, and the ends of the first and third segments of the rod that connect to the second segment are configured with internal rectangular threads.

[0010] Furthermore, at the connection points between the first and third segments of the rod and the second segment, compression deformation is applied to form a press-fit structure to tighten the second segment of the rod.

[0011] The beneficial effects of adopting the above technical solution are as follows: This utility model innovatively proposes an insulating tie rod, comprising a split first segment, a second segment, and a third segment. The first and third segments are metal rods, while the second segment is an insulating rod. The first segment is connected to the pressure cap on the surge arrester core via a metal nut, and the third segment is connected to the surge arrester base via a metal nut. Furthermore, the first segment is fixedly connected to the second, third, and fourth segments. This ensures that the insulating tie rod of this utility model has good insulation properties, and the metal rod and metal nut connection effectively prevents damage to the fit between the insulating tie rod and the insulating tie rod nut when subjected to excessive tensile force.

[0012] A surge arrester includes an insulating rod, the insulating rod comprising a split rod body, the split rod body comprising a first segment, a second segment, and a third segment, the first segment and the third segment being metal rod bodies, the second segment being an insulating rod body, the first segment being used to connect to the pressure cap on the surge arrester core via a metal nut, and the third segment being used to connect to the surge arrester base via a metal nut, wherein the first segment is fixedly connected to the second segment, the second segment, and the third segment.

[0013] Furthermore, the first segment and the second segment of the rod, and / or the second segment and the third segment of the rod are connected by rectangular threads.

[0014] Furthermore, the two ends of the second segment of the rod along its length are configured with external rectangular threads, and the ends of the first and third segments of the rod that connect to the second segment are configured with internal rectangular threads.

[0015] Furthermore, at the connection points between the first and third segments of the rod and the second segment, compression deformation is applied to form a press-fit structure to tighten the second segment of the rod.

[0016] Furthermore, the cavity inside the surge arrester housing is filled with a mixture of oxygen and nitrogen as an insulating gas.

[0017] Furthermore, oxygen accounts for 20.5% and nitrogen accounts for 79.5%.

[0018] The above technical solution offers the following advantages: This utility model provides an improved surge arrester, including an insulating rod. The insulating rod comprises a split first section, a second section, and a third section. The first and third sections are metal rods, while the second section is an insulating rod. The first section is connected to the surge arrester core cap via a metal nut, and the third section is connected to the surge arrester base via a metal nut. Furthermore, the first, second, and third sections are all fixedly connected. This ensures good insulation performance of the insulating rod, and the metal rod and nut connection effectively prevents damage to the connection between the insulating rod and the nut under excessive tension, thus guaranteeing the normal service life of the surge arrester. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one embodiment of the surge arrester of this utility model.

[0020] Figure 2 This is a structural schematic diagram of one embodiment of the insulating tie rod of this utility model.

[0021] Figure 3 for Figure 2 A schematic diagram of a split-type insulating tie rod.

[0022] Figure 4 This is a top view of the pressure cover on the core of one embodiment of the surge arrester of this utility model.

[0023] Figure 5 This is a cross-sectional view of the pressure cap on the core of one embodiment of the surge arrester of this utility model.

[0024] In the diagram: 1. Basin insulator; 2. Contact seat; 3. Conductive rod; 4. Core cover; 5. Core spring; 6. Resistance element; 7. Insulating rod; 8. Equalizing cover; 9. Housing; 10. Rupture disc; 11. Channel steel; 12. Rain cover; 13. Low-voltage insulator; 14. Monitor; 15. Base; 16. Outgoing line; 17. Insulating pad; 18. Terminal block; 19. Air valve; 20. Packaging nut; 21. First section of the rod; 22. Second section of the rod; 23. Third section of the rod; 24. Location for metal nut; 25. Through hole. Detailed Implementation

[0025] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0026] This invention provides an insulating tie rod, which is designed as a split type, comprising a first section, a second section, and a third section. The first and third sections are made of metal, while the second section is made of insulating material. The first section is connected to the pressure cap on the surge arrester core via a metal nut, and the third section is connected to the surge arrester base via a metal nut. The first, second, and third sections are all fixedly connected. This design ensures good insulation performance, and the metal rod and nut connection effectively prevents damage to the connection between the insulating tie rod and the nut under excessive tensile force, thus ensuring the normal service life of the surge arrester.

[0027] Based on the above concept, this utility model provides various embodiments of surge arresters for illustration.

[0028] In a basic embodiment, such as Figure 1As shown, the surge arrester includes a housing 9, a base 15 fixedly installed at the lower end of the housing 9, a channel steel 11 provided on the lower end face of the base 15, a low-voltage insulator 13 also provided at the lower end of the base 15, a detector 14 connected to the metal insert of the low-voltage insulator 13, a rain cover 12 also installed on the outside of the low-voltage insulator 13, a surge arrester core fixedly installed on the upper end face of the base 15, a terminal block 18 and an insulating pad 17 are provided between the surge arrester core and the base 15, the terminal block 18 and the metal insert in the low-voltage insulator 13 are connected by an outgoing wire 16, a core upper pressure cover 4 is provided at the upper end of the surge arrester core, a conductive rod 3 is connected to the core upper pressure cover 4, and an equalizing cover 8 is provided between the conductive rod 3 and the core upper pressure cover 4, the equalizing cover 8 is fixedly installed on the surge arrester core. The upper end of the conductive rod 3 is fixedly installed in the contact seat 2. A basin-type insulator 1 is fixedly installed above the housing 9. The upper end of the contact seat 2 is fixedly installed on the metal insert of the basin-type insulator 1. A rupture disc 10 and an air valve 19 are also provided on the outer side of the housing 9. The upper end of the housing 9 is also provided with a packaging nut 20 for fixing the housing 19 and the packaging shell. The basin-type insulator 1 is located in the cavity formed between the packaging shell and the housing 9.

[0029] The surge arrester core includes an insulating rod 7, the upper end of which is connected to the upper cover 4 of the core, and the lower end of which is connected to the base 15. Multiple resistor plates 6 are stacked between the upper cover 4 of the core and the base 15. A core spring 5 is provided between the upper end of the uppermost resistor plate 6 and the lower end face of the upper cover 4 of the core.

[0030] like Figure 2-5 As shown, the insulating rod 7 is configured as a split type, including a first section 21, a second section 22, and a third section 23. The first section 21 and the third section 23 are metal rods, and the second section 22 is an insulating rod. The upper end of the first section 21 passes through the through hole 25 on the core upper cover 4 and is connected to the metal nut at position 24 of the core upper cover 4. The lower end of the third section 23 passes through the through hole on the base 15 and is connected to the metal nut. The first section 21, the second section 22, and the third section 23 are all fixedly connected.

[0031] Based on the above embodiments, through holes can be provided at the connection points of the first segment 21 and the second segment 22, and the second segment 22 and the third segment 23 of the rod. After the first segment 21 and the second segment 22, and the second segment 22 and the third segment 23 of the rod are respectively connected and fitted, they are fixedly connected using a bolt and nut assembly. The bolt passes through the through hole provided at the connection point, and the nut is tightened to achieve the function of fixing the connection. In another embodiment, the connection point of the first segment 21 and the second segment 22 of the rod is set to be fixedly connected using a bolt and nut assembly, and the connection point of the second segment 22 and the third segment 23 of the rod is directly screwed together by a threaded hole on one of the segments and a threaded post on the other, with the thread between the two being a rectangular thread. Alternatively, the connection point of the first segment 21 and the second segment 22 of the rod is directly screwed together by a threaded hole on one of the segments and a threaded post on the other, with the thread between the two being a rectangular thread, and the connection point of the second segment 22 and the third segment 23 of the rod is fixedly connected using a bolt and nut assembly. In a preferred embodiment, such as Figure 2-3 As shown, the connection between the first segment 21 and the second segment 22 of the rod, and the connection between the second segment 22 and the third segment 23 of the rod, are all made by directly screwing a threaded hole on one side to a threaded post on the other side. The thread between the two is a rectangular thread, which can withstand a large shear force and effectively improve the tensile strength of the insulating tie rod 7.

[0032] Based on the above embodiments, internal rectangular threads can be provided at both ends of the second segment 22 of the rod, and an external rectangular thread can be provided at the end connecting the first segment 21 and the third segment 23 of the rod. Alternatively, one end of the second segment 22 of the rod can be provided with an internal rectangular thread, and the other end with an external rectangular thread. Correspondingly, one of the first segment 21 and the third segment 23 of the rod can be provided with an external rectangular thread, and the other with an internal rectangular thread. In both cases, the connection between the first segment 21 and the second segment 22 of the rod, and between the second segment 22 and the third segment 23 of the rod, can be a rectangular thread connection. In a preferred embodiment, such as... Figure 2-3 As shown, the two ends of the second segment 22 of the rod are set with external rectangular threads, and the ends of the first segment and the third segment of the rod that are connected to the second segment are set with internal rectangular threads, so that the two ends of the second segment 22 of the rod are screwed into the first segment 21 and the third segment 23 of the rod respectively. The two ends of the second segment 22 of the insulating rod 7 adopt a threaded shaft structure, which can ensure good structural strength.

[0033] Based on the above embodiments, the insulating tie rod 7 enhances its overall tensile strength solely through rectangular threaded connections at the joints of the first segment 21 and the second segment 22, and the second segment 22 and the third segment 23. In a preferred embodiment, the joints of the first segment 21 and the third segment 23 with the second segment 22 are both formed by compression deformation to create a press-fit structure, thereby tightening the second segment 22 and further improving the overall tensile strength of the insulating tie rod 7.

[0034] Based on the above embodiments, when using the surge arrester of this utility model, the insulating gas can be SF6 gas. In a preferred embodiment, during use, a mixture of oxygen and nitrogen is introduced as the insulating gas through the gas filling valve 19 on the housing 9, with oxygen accounting for 20.5% and nitrogen accounting for 79.5%. This can greatly reduce the environmental pollution caused by SF6 gas, resulting in better environmental performance, while also reducing the cost of obtaining nitrogen.

[0035] Using the surge arrester of this utility model, the surge arrester core is first assembled. The insulating component in the surge arrester core uses the split insulating rod 7 of this utility model, which can ensure that the insulating rod 7 has good insulation performance. At the same time, the connection between the metal rod and the metal nut can effectively prevent damage to the fit between the insulating rod 7 and the insulating rod nut when the tensile force on the insulating rod 7 is too large, thus ensuring the normal service life of the surge arrester. Then, the surge arrester is assembled as a whole. Finally, insulating gas is filled into the cavity inside the shell 9 through the gas filling valve 19. The insulating gas is a mixture of oxygen and nitrogen, which is not only environmentally friendly but also low in cost.

[0036] The embodiment of the insulating tie rod of this utility model is consistent with the insulating tie rod structure in the above-mentioned surge arrester, and will not be described again in this article.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. An insulated pull rod characterized in that, The rod body comprises a first rod segment, a second rod segment and a third rod segment, the first and third rod segments are metal rod bodies, the second rod segment is an insulating rod body, the first rod segment is connected to the upper cover of the arrester core through a metal nut, the third rod segment is connected to the arrester base through a metal nut, and the first rod segment is fixedly connected to the second rod segment, the second rod segment is fixedly connected to the third rod segment.

2. The insulated pull rod of claim 1, wherein, The first and second rod segments, and / or the second and third rod segments are rectangularly threaded.

3. The insulated pull rod of claim 2, wherein, The two ends of the second rod segment in the length direction are provided with outer rectangular threads, and the end of the first and third rod segments connected to the second rod segment is provided with an inner rectangular thread.

4. The insulated pull rod of claim 3, wherein, The first and third rod segments are extruded and deformed at the connecting segments of the first and third rod segments to the second rod segment to form a crimping structure to clamp the second rod segment.

5. A surge arrester comprising an insulating rod, characterized in that The rod body comprises a first rod segment, a second rod segment and a third rod segment, the first and third rod segments are metal rod bodies, the second rod segment is an insulating rod body, the first rod segment is connected to the upper cover of the arrester core through a metal nut, the third rod segment is connected to the arrester base through a metal nut, and the first rod segment is fixedly connected to the second rod segment, the second rod segment is fixedly connected to the third rod segment.

6. The surge arrester of claim 5, wherein, The first and second rod segments, and / or the second and third rod segments are rectangularly threaded.

7. The surge arrester of claim 6, wherein The two ends of the second rod segment in the length direction are provided with outer rectangular threads, and the end of the first and third rod segments connected to the second rod segment is provided with an inner rectangular thread.

8. The surge arrester of claim 7, wherein, The first and third rod segments are extruded and deformed at the connecting segments of the first and third rod segments to the second rod segment to form a crimping structure to clamp the second rod segment.

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