Head structure of a high voltage bushing

Abstract

The utility model provides a head structure of high pressure bushing belongs to the technical field of matching electrical equipment. In this structure, the conductive rod and the conductive pipe are welded to form a whole as the current-carrying pipe and the coiled pipe, the capacitor core is coiled on the coiled pipe, the flange is fixedly connected with the capacitor core and is internally provided with the first sealing ring, the porcelain piece is connected with the flange and the connecting seat B as the external insulation, the connecting seat B is internally provided with two third sealing rings and axially sealed with the conductive rod to form a closed space filled with insulation medium, the porcelain piece is provided with the second sealing ring at the end of the flange and the connecting seat B, the second metal washer, the disc spring and the connecting seat A are sequentially arranged on the conductive rod, the conductive rod is locked through special tooling and fastener after extension, the equalizing sealing cover is axially sealed with the conductive rod and is internally provided with two sixth sealing rings, the connecting seat A is provided with a radial fifth sealing ring, the equalizing sealing cover and the connecting seat A are fixed through bolts, the first metal washer ensures the compression amount of the sixth sealing ring, and finally the wiring terminal is installed.

Description

Technical Field

[0001] This utility model relates to the field of supporting electrical equipment technology, and in particular to a head structure of a high-voltage bushing. Background Technology

[0002] A bushing is a device that connects the internal leads of a transformer to the external high-voltage lines, serving functions such as mechanical support, current carrying, sealing, and ground insulation. To prevent rainwater from entering the bushing, conventional guide rod bushings use a "general's cap" structure at the head (air end), which often features a waterproof platform and a sealing design. However, because the tension of the overhead conductor is borne solely by the engagement of the general's cap with the conductive pipe threads, problems such as poor sealing and high current carrying capacity can occur, leading to bushing damage under prolonged high-temperature operation. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a head structure for a high-voltage bushing, which solves the problems of frequent overheating failures caused by relying solely on the engagement of the cap and the conductive pipe thread to withstand the tension of overhead conductors, poor sealing effect, and insufficient current-carrying area.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A head structure for a high-voltage bushing includes a conductive rod, a conductive tube, a capacitor core, a flange, a ceramic component, a connecting seat B, a connecting seat A, a pressure equalizing sealing cover, a first metal washer, a second metal washer, a disc spring, fasteners, a first bolt, a second bolt, and a terminal block. The conductive rod and the conductive tube are welded together to form an integral unit, serving as a current-carrying tube and a rolled tube; The capacitor core is wound onto a winding tube; The flange is fixedly connected to the capacitor core, and a first sealing ring is provided inside it; One end of the ceramic component is connected to the flange, and the other end is connected to the connecting seat B. Two third sealing rings are provided in the connecting seat B to provide axial sealing with the conductive rod. The ceramic component is provided with second sealing rings at the ends of the flange and the connecting seat B respectively. The second metal washer, disc spring, and connecting seat A are sequentially mounted on the conductive rod, which extends directly and is secured to the sleeve by special tooling and fasteners. The pressure equalizing sealing cover is provided with two sixth sealing rings to provide axial sealing with the conductive rod, and the connecting seat A is provided with a radial fifth sealing ring. The pressure equalizing sealing cover and the connecting seat A are fixedly connected by the second bolt. The first metal gasket is disposed outside the sixth sealing ring, and the first metal gasket and the pressure equalizing sealing cover are fixedly connected by the first bolt; The wiring terminals are mounted on the conductive rod and fixedly connected by bolts.

[0005] Furthermore, after the flange and capacitor core are fitted together by a snap-fit, epoxy resin is filled into the contact surface to achieve adhesive fixation.

[0006] Furthermore, the insulating medium filling the enclosed space formed by the connecting seat B, the ceramic component, the conductive rod, and the capacitor core is transformer oil.

[0007] Furthermore, the ceramic component and the connection ends of the flange and the connecting seat B are all provided with stepped grooves, and the second sealing ring is embedded in the stepped groove.

[0008] Furthermore, the inner wall of the connecting seat B is provided with two annular grooves, and the third sealing ring is correspondingly embedded in the annular grooves and has an interference fit with the outer wall of the conductive rod.

[0009] Furthermore, the second metal washer, disc spring, and connecting seat A are arranged sequentially along the axial direction of the conductive rod, and the disc spring is in a pre-compressed state.

[0010] Furthermore, the inner wall of the pressure equalization sealing cover is provided with two annular sealing grooves, and the sixth sealing ring is embedded in the sealing grooves and forms an axial seal with the outer wall of the conductive rod.

[0011] Furthermore, the outer circumferential surface of the connecting seat A is provided with an annular groove, and the fifth sealing ring is embedded in the groove and forms a radial seal with the inner wall of the pressure equalization sealing cover.

[0012] Furthermore, the thickness of the first metal washer is 0.5-2mm, and after being tightened by the first bolt, it creates a compression of 0.3-0.8mm on the sixth sealing ring.

[0013] Furthermore, the terminal block has a slotted hole on its surface, which is connected to the threaded hole at the end of the conductive rod by a bolt passing through the slotted hole, and the surface of the terminal block is perpendicular to the axis of the conductive rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Simple structure, easy assembly, high reliability and safety. The connection methods between each component are clearly defined, the assembly process is easy to operate, which can effectively improve production efficiency, while the stable structure ensures the reliability and safety of the bushing during operation.

[0015] 2. The conductive rod extends directly from connector B, connector A, pressure equalizing sealing cover, and the first metal washer, solving problems caused by thermal expansion and contraction, material deformation, and head heating, ensuring reliable sealing and a stable connection, and guaranteeing the stable operation of the power system. This design allows the conductive rod to maintain a good sealing and connection state under various operating conditions, reducing the occurrence of failures.

[0016] 3. By welding the conductive rod and conductive tube together to form a single unit, costs are saved and weight is reduced. The conductive tube enhances heat dissipation, and combined with the high conductivity of the conductive rod, overall heat distribution is optimized. The welded integral structure reduces the number of components, lowers costs, and the optimized heat distribution effectively extends the service life of the sleeve.

[0017] 4. This design extends the lifespan of the bushing and reduces maintenance costs. Due to its stable structure, reliable sealing, and reasonable heat distribution, the failure rate of the bushing is reduced, thereby extending its service life and decreasing the frequency and cost of maintenance. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a cross-sectional structural diagram of an embodiment of the present utility model.

[0019] In the above-mentioned attached figures: 1. Conductive tube; 2. Capacitor core; 3. Flange; 4. First sealing ring; 5. Ceramic component; 6. Connecting seat B; 7. Second sealing ring; 8. Connecting seat A; 9. Pressure equalizing sealing cover; 10. First metal washer; 11. Third sealing ring; 12. Second metal washer; 13. Disc spring; 14. Fastener; 16. First bolt; 17. Fifth sealing ring; 18. Sixth sealing ring; 19. Second bolt; 20. Terminal block; 21. Conductive rod. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, a head structure of a high-voltage bushing includes a conductive tube 1, a capacitor core 2, a flange 3, a ceramic part 5, a connecting seat B6, a connecting seat A8, a pressure equalizing sealing cover 9, a first metal washer 10, a second metal washer 12, a disc spring 13, a fastener 14, a first bolt 16, a second bolt 19, a terminal block 20, and a conductive rod 21.

[0022] The conductive rod 21 is made of copper with high conductivity, and the conductive tube 1 is made of copper tubing. The conductive rod 21 and the conductive tube 1 are welded together to form a single unit, which serves as both a current-carrying tube and a rolled tube. This welded integral structure reduces connecting parts, saves costs, and reduces overall weight. Moreover, the conductive tube 1 enhances heat dissipation, and together with the high conductivity of the conductive rod 21, optimizes the overall heat distribution.

[0023] The capacitor core 2 is rolled on a coiled tube and made of high-quality insulating material to ensure its insulation performance. A flange 3 is provided on the capacitor core 2. The flange 3 is made of cast iron and is fixedly connected to the capacitor core 2 by a combination of clips and adhesive. Inside the flange 3 is a first sealing ring 4, made of oil-resistant rubber, which enhances the sealing performance between the flange 3 and the capacitor core 2.

[0024] A ceramic component 5 is used as the external insulation. High-strength electrical porcelain is selected for component 5, which possesses excellent insulation performance and mechanical strength. One end of component 5 connects to flange 3, and the other end connects to connecting seat B6. Connecting seat B6 is made of aluminum alloy and contains two third sealing rings 11 made of fluororubber, which provide axial sealing with the conductive rod 21, resulting in excellent sealing performance. Connecting seat B6, ceramic component 5, conductive rod 21, and capacitor core 2 form a closed space filled with transformer oil as the insulating medium. Transformer oil has excellent insulation and heat dissipation properties, providing support and protection for the internal components. Second sealing rings 7, made of nitrile rubber, are provided at the ends of ceramic component 5, flange 3, and connecting seat B6, respectively, further enhancing the sealing performance.

[0025] The second metal washer 12 is made of stainless steel, the disc spring 13 is made of 60Si2Mn material, which has good elasticity and toughness, and the connecting seat A8 is made of aluminum alloy. They are arranged sequentially on the conductive rod 21, which extends directly. Finally, the sleeve is locked by special tooling and fastener 14. The fastener 14 is made of high-strength bolts to ensure the overall structure of the sleeve is stable.

[0026] Two sixth sealing rings 18 are installed inside the pressure equalizing sealing cover 9. The sixth sealing rings 18 are made of silicone rubber and provide axial sealing with the conductive rod 21. The pressure equalizing sealing cover 9 is made of aluminum alloy and serves to equalize pressure and seal. A radial fifth sealing ring 17 is installed on the connecting seat A8. The fifth sealing ring 17 is made of EPDM rubber. The pressure equalizing sealing cover 9 and the connecting seat A8 are fixedly connected by the second bolt 19. The second bolt 19 is a high-strength bolt to ensure the connection is firm.

[0027] To ensure the compression of the sixth sealing ring 18, a first metal washer 10 is provided on its outside. The first metal washer 10 is made of high-strength alloy steel. The first metal washer 10 and the pressure equalizing sealing cover 9 are fixedly connected by the first bolt 16. The first bolt 16 is a high-strength bolt to ensure the overall sealing performance of the sleeve.

[0028] Finally, install the terminal block 20 on the conductive rod 21. The terminal block 20 is made of copper and is fixed by bolts. When installing, pay attention to the orientation of the board surface to ensure that it meets the working requirements.

[0029] By setting and connecting the above components, the high-voltage bushing head structure of this utility model is formed. This structure solves the problems of frequent overheating failures caused by relying solely on the engagement of the general cap and the conductive pipe thread to bear the tension of the overhead conductor, poor sealing effect, and insufficient current carrying area. It has the advantages of simple structure, convenient assembly, reliable sealing, good heat dissipation performance, and long service life.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A head structure of a high voltage bushing, characterized by Includes conductive rod (21), conductive tube (1), capacitor core (2), flange (3), ceramic part (5), connector B (6), connector A (8), pressure equalizing sealing cover (9), first metal washer (10), second metal washer (12), disc spring (13), fastener (14), first bolt (16), second bolt (19) and terminal block (20); The conductive rod (21) and the conductive tube (1) are welded together to form an integral whole, serving as a current-carrying tube and a rolled tube; The capacitor core (2) is wound on a winding tube; The flange (3) is fixedly connected to the capacitor core (2), and a first sealing ring (4) is provided inside it. One end of the ceramic piece (5) is connected to the flange (3), and the other end is connected to the connecting seat B (6). Two third sealing rings (11) are provided in the connecting seat B (6) to provide axial sealing with the conductive rod (21). The ceramic piece (5) is provided with second sealing rings (7) at the ends of the flange (3) and the connecting seat B (6). The second metal washer (12), disc spring (13), and connecting seat A (8) are sequentially arranged on the conductive rod (21), and the conductive rod (21) extends directly and the sleeve is locked by special tooling and fasteners (14); The pressure equalization sealing cover (9) is provided with two sixth sealing rings (18) to provide axial sealing with the conductive rod (21). A radial fifth sealing ring (17) is provided on the connecting seat A (8). The pressure equalization sealing cover (9) and the connecting seat A (8) are fixedly connected by the second bolt (19). The first metal washer (10) is placed outside the sixth sealing ring (18), and the first metal washer (10) and the pressure equalizing sealing cover (9) are fixedly connected by the first bolt (16); The terminal block (20) is mounted on the conductive rod (21) and fixedly connected by bolts.

2. A head structure for a high voltage bushing according to claim 1, characterized in that After the flange (3) and the capacitor core (2) are fitted together by a snap-fit, epoxy resin is filled into the contact surface to achieve adhesive fixation.

3. A head structure for a high voltage bushing according to claim 1, characterized in that The insulating medium filling the enclosed space formed by the connecting seat B (6), the ceramic piece (5), the conductive rod (21), and the capacitor core (2) is transformer oil.

4. A head structure for a high voltage bushing according to claim 1, characterized in that The ceramic piece (5) is provided with stepped grooves at the connection ends of the flange (3) and the connecting seat B (6), and the second sealing ring (7) is embedded in the stepped groove.

5. A head structure for a high voltage bushing according to claim 1, characterized in that The inner wall of the connecting seat B (6) is provided with two annular grooves, and the third sealing ring (11) is correspondingly embedded in the annular grooves and is interference-fitted with the outer wall of the conductive rod (21).

6. A head structure for a high voltage bushing according to claim 1, characterized in that The second metal washer (12), disc spring (13), and connecting seat A (8) are arranged sequentially along the axial direction of the conductive rod (21), and the disc spring (13) is in a pre-compressed state.

7. A head structure for a high voltage bushing according to claim 1, characterized in that The inner wall of the pressure equalization sealing cover (9) is provided with two annular sealing grooves, and the sixth sealing ring (18) is embedded in the sealing groove and forms an axial seal with the outer wall of the conductive rod (21).

8. A head structure for a high voltage bushing according to claim 1, characterized in that The outer circumferential surface of the connecting seat A (8) is provided with an annular groove, and the fifth sealing ring (17) is embedded in the groove and forms a radial seal with the inner wall of the pressure equalization sealing cover (9).

9. A head structure for a high voltage bushing according to claim 1, characterized in that After the first metal washer (10) is locked by the first bolt (16), it forms a certain amount of compression on the sixth sealing ring (18).

10. A head structure for a high voltage bushing as claimed in claim 1, characterized in that The plate surface of the terminal (20) is provided with a waist-shaped hole, and the terminal is connected with the threaded hole at the end of the conductive rod (21) through a bolt passing through the waist-shaped hole, and the plate surface is arranged perpendicularly to the axis of the conductive rod (21).

Images