A compact and lightened connecting fitting for a valve tower of a direct current engineering converter station

Abstract

This invention discloses a compact and lightweight connection fitting for valve towers in DC converter stations, relating to the field of power equipment manufacturing technology. It includes an upper connection fitting, a lower connection fitting, and an inclined nut connecting the two. The upper connection fitting features a first nut clamp holding the upper end of the inclined nut, which also grips a shielding ring nut. A first flexible conductor is welded to the first nut clamp and a second nut clamp to form a flow path. The lower connection fitting features a third nut clamp holding the bottom end of the inclined nut. A second connecting plate has a rectangular frame at its end for connecting an equalizing ring. A second flexible conductor is welded to the third nut clamp and the rectangular frame to form a flow path. This invention has a simple structure, achieves separation of flow and stress, effectively prevents corona discharge, and is suitable for compact layouts in UHV converter station valve towers.

Description

Technical Field

[0001] This invention relates to the field of power equipment manufacturing technology, and more specifically to a connecting hardware for electrical connection and fixing of valve towers in the valve hall of a DC converter station. Background Technology

[0002] In recent years, with the continuous growth of domestic electricity demand, the construction scale of high-voltage and ultra-high-voltage direct current (HVDC) transmission projects has been expanding. As the core component of the HVDC transmission system, the converter station has a complex valve tower structure and dense equipment. The connection methods between the various electrical units in the valve tower are diverse, and it is subject to strict electrical insulation distance (air clearance) and mechanical load requirements.

[0003] Currently, the connecting fittings used in existing converter station valve towers generally suffer from problems such as complex structure, large space occupation, difficult installation, and ineffective separation of current-carrying and stress-bearing components. Especially under ultra-high voltage levels, traditional fittings struggle to simultaneously meet the requirements of compact layout, good current-carrying capacity, sufficient mechanical strength, and anti-corona (corona-inducing) performance. Furthermore, existing fittings often use heavy materials or materials unsuitable for high electric field environments, resulting in large overall weight, high manufacturing costs, and low assembly efficiency.

[0004] Therefore, there is an urgent need for valve tower connection hardware that is simplified in structure, lightweight, highly adaptable, and has superior electrical performance, in order to meet the comprehensive requirements of UHV converter stations for equipment compactness, reliability, and economy. Summary of the Invention

[0005] In view of this, the present invention provides a compact and lightweight connection fitting for valve towers in DC converter stations, aiming to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A compact and lightweight connection fitting for valve towers in DC converter stations includes an upper connection fitting, a lower connection fitting, and an inclined tube nut connecting the two. The upper connecting fitting includes a first pipe clamp, a first support rod, a first connecting plate, a first clamp, a second pipe clamp, a first flexible wire welding assembly, and a shield welding assembly. The first pipe clamp is fixed to the upper end of the inclined pipe. One end of the first support rod is fixedly connected to the first pipe clamp, and the first connecting plate is fixedly connected to the other end of the first support rod. The first clamp is fixed to the first connecting plate and is used to clamp the shielding ring pipe of the connecting valve tower. The second pipe clamp is fixed to the shielding ring pipe. The two ends of the first flexible wire welding assembly are respectively connected to the first pipe clamp and the second pipe clamp to form a flow path. The shield welding assembly is fixed to the first connecting plate through a first connecting frame and is located outside the first connecting plate, covering the first flexible wire welding assembly. The lower connecting fitting includes a third tube clamp, a second support rod, a second connecting plate, a second flexible wire welding assembly, and an equalizing ring shielding welding assembly. The third tube clamp is fixed to the bottom end of the inclined tube. One end of the second support rod is fixedly connected to the third tube clamp. One end of the second connecting plate is connected to the other end of the second support rod, and the other end of the second connecting plate has a rectangular frame for connecting the equalizing ring. The two ends of the second flexible wire welding assembly are respectively connected to the third tube clamp and the rectangular frame to form a flow path. The equalizing ring shielding welding assembly is fixedly connected to the third tube clamp through a second connecting frame and is located outside the second flexible wire welding assembly.

[0008] Through the above technical solution, this invention achieves spatial avoidance and flexible connection by using an inclined nut between the upper and lower connecting fittings, effectively adapting to the compact installation environment inside the valve tower and meeting strict air insulation distance requirements. The upper end uses a clamping mechanism in conjunction with the nut clamp to reliably fix it to the shielding ring nut, while the lower end directly connects to the equalizing ring via a rectangular frame. The overall structure is simple and easy to install. The flexible conductor welding is independent of the mechanical force path, only undertaking the current-carrying function without transmitting mechanical loads. The middle section is suspended and free, effectively absorbing installation errors and operational stress. Thermal expansion and contraction deformation avoids poor contact or breakage caused by stress, significantly improving the reliability and service life of electrical connections; the combination of shielding cover welding and equalizing ring shielding welding can form effective electric field shielding at both ends, preventing corona discharge of hardware under high voltage; in addition, the components are connected by hinges, universal joints and other methods, which makes assembly flexible and adjustment margin large, reducing the requirements for processing accuracy and the difficulty of on-site installation. The overall structure is simplified, lightweight and low cost, which is particularly suitable for the comprehensive requirements of compactness, reliability and economy of valve towers in UHVDC converter stations.

[0009] Preferably, in the above-mentioned compact and lightweight connecting hardware for a valve tower of a DC converter station, the rectangular frame is a frame-type plate welded structure, the end of the second connecting plate away from the rectangular frame has a universal joint, and the second connecting plate is hinged to the second support rod through the universal joint.

[0010] Preferably, in the above-mentioned compact and lightweight connecting hardware for the valve tower of a DC converter station, the first clamp is an openable and closable annular clamp structure, and the first clamp is fixed to the shielding ring tube nut by bolts.

[0011] Preferably, in the above-mentioned compact and lightweight connecting fitting for the valve tower of a DC converter station, the second pipe nut clamp and the first clamp are spaced apart along the axial direction of the shielding ring pipe nut, and the second pipe nut clamp is located between the two first clamps.

[0012] Preferably, in the above-mentioned compact and lightweight connecting hardware for valve towers of DC converter stations, both the first flexible wire welding assembly and the second flexible wire welding assembly include multi-strand stranded flexible wires and terminals at both ends, and the terminals are respectively pressed onto the corresponding connecting parts by bolts.

[0013] Preferably, in the above-mentioned compact and lightweight connecting hardware for a valve tower of a DC converter station, the end of the first support rod is hinged to the first connecting plate by a threaded fastener.

[0014] Preferably, in the above-mentioned compact and lightweight connecting hardware for a valve tower of a DC converter station, the first flexible wire welding assembly is set independently of the mechanical force path formed by the first support rod and the first connecting plate, and the middle section of the first flexible wire welding assembly is in a suspended and free state.

[0015] Preferably, in the above-mentioned compact and lightweight connecting hardware for the valve tower of a DC converter station, the second flexible conductor welding assembly is set independently of the mechanical force path formed by the second support rod and the second connecting plate, and the middle section of the second flexible conductor welding assembly is in a suspended and free state.

[0016] Preferably, in the above-mentioned compact and lightweight connecting fitting for a valve tower of a DC converter station, the shielding cover welded assembly completely covers the outside of the first connecting plate, the first clamp and the second pipe clamp, and an air gap is left between the inner wall of the shielding cover welded assembly and the first connecting plate.

[0017] Preferably, in the above-mentioned compact and lightweight connecting hardware for valve towers of DC converter stations, the equalizing ring shield welding assembly is an annular tubular structure, and the equalizing ring shield welding assembly is connected to the equalizing ring support plate by a single bolt. The single bolt allows the equalizing ring shield welding assembly to be finely adjusted in position along the installation direction.

[0018] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a compact and lightweight connection fitting for valve towers in DC converter stations, which has the following beneficial effects: 1. Simplified structure and convenient installation: The inclined nut between the upper and lower connecting fittings allows for space avoidance and flexible connection, effectively adapting to the compact installation environment inside the valve tower and meeting strict air insulation distance requirements; the components are connected by hinges and universal joints, which allows for flexible assembly and a large adjustment margin, reducing the requirements for machining accuracy and the difficulty of on-site installation, and reducing the amount of assembly work.

[0019] 2. Electrical-force separation, reliable current carrying: The flexible conductor is welded independently of the mechanical force path formed by the support rod and connecting plate. It only undertakes the function of current carrying and does not transmit mechanical load. The middle section is suspended and free, which can effectively absorb installation errors and thermal expansion and contraction deformation during operation, avoid poor contact or breakage caused by stress, and significantly improve the reliability and service life of electrical connection.

[0020] 3. Electric field shielding to prevent corona discharge: The combination of the shielding cover welding and the equalizing ring shielding welding can form effective electric field shielding at both the upper and lower ends, preventing the hardware from corona discharge under high voltage and ensuring the safe operation of the equipment in a high electric field environment.

[0021] 4. Lightweight design to reduce costs: Each connecting plate is made of aluminum alloy sheet and has light-reducing holes, resulting in a simple and lightweight overall structure that reduces material costs; at the same time, the universal joint and single bolt micro-adjustment structure make the on-site installation position adjustable, reducing installation difficulty and labor costs.

[0022] 5. Highly adaptable and replicable: This connecting hardware can meet the reliable connection requirements of the valve tower of the UHVDC converter station under the extreme air clearance, providing a replicable technical solution for the compact layout of future UHV equipment, and has good market application prospects. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 The attached figure is a structural schematic diagram of the compact and lightweight connection hardware for valve towers in DC converter stations provided by the present invention; Figure 2 The attached figure is a plan view of the upper connecting fitting provided by the present invention; Figure 3 The attached figure is a structural schematic diagram of the upper connecting hardware provided by the present invention from a bottom view angle; Figure 4 The attached figure is a top view of the structure of the upper connecting hardware provided by the present invention; Figure 5 The attached figure is a partial structural schematic diagram of the upper connecting hardware provided by the present invention; Figure 6 The attached figure is a plan view of the lower end connecting fitting provided by the present invention; Figure 7 The attached figure is a structural schematic diagram of the lower end connecting fitting provided by the present invention; Figure 8 The attached figure is a structural schematic diagram of the second connecting plate of the lower end connecting hardware provided by the present invention.

[0025] in: 1-Upper end connecting fitting; 2-Lower end connecting fitting; 3-Inclined tube nut; 4-Shielding ring tube nut; 11-First female conduit clamp; 12-First support rod; 13-First connecting plate; 14-First clamp; 15-Second female conduit clamp; 16-First flexible wire welding; 17-Shielding cover welding; 21-Third tube clamp; 22-Second support rod; 23-Second connecting plate; 24-Second flexible wire welding assembly; 25-Equalizing ring shielding welding assembly; 26-Rectangular frame; 27-Universal joint. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] See appendix Figure 1 To be continued Figure 8This invention discloses a compact and lightweight connecting fitting for valve towers in DC converter stations, comprising an upper connecting fitting 1, a lower connecting fitting 2, and an inclined nut 3 connecting the two. This connecting fitting is mainly used in valve towers of ±400kV and above ultra-high voltage DC converter stations to achieve electrical connection and mechanical fixation between the valve tower shielding ring nut and the equalizing ring.

[0028] Specific implementation methods for the upper connecting hardware: such as Figures 1 to 5 As shown, the upper connecting hardware 1 includes a first female tube clamp 11, a first support rod 12, a first connecting plate 13, a first clamp 14, a second female tube clamp 15, a first flexible wire welding device 16, and a shielding cover welding device 17.

[0029] The first tube clamp 11 is fixed to the upper end of the inclined tube 3. Specifically, the first tube clamp 11 is a split clamp structure, consisting of at least two clamping blocks that are locked together by bolts. The inner hole shape of the clamping blocks matches the outer diameter of the inclined tube 3 to achieve reliable clamping of the inclined tube 3.

[0030] One end of the first support rod 12 is fixedly connected to the first pipe clamp 11. The first support rod 12 can be made of round or square tube profiles, and its two ends can be respectively provided with connecting lugs or threaded structures to facilitate hinged or fixed connections with other components. The end of the first support rod 12 is hinged to the first connecting plate 13 by threaded fasteners, so that the upper connecting hardware 1 has a certain angle adjustment margin during installation, which can adapt to on-site installation deviations.

[0031] The first connecting plate 13 is fixedly connected to the other end of the first support rod 12. The first connecting plate 13 is made of aluminum alloy sheet, and weight-reducing holes are opened on the plate surface to achieve a lightweight design. The shape of the first connecting plate 13 can be optimized according to the actual stress requirements and installation space to reduce weight as much as possible while ensuring mechanical strength.

[0032] The first clamp 14 is fixedly connected to the first connecting plate 13 and is used to clamp the shielding ring tube 4 of the connecting valve tower. The first clamp 14 is an openable and closable annular clamp structure, consisting of at least two clamping blocks, which are locked and fixed to the shielding ring tube 4 by bolts. The inner hole shape of the first clamp 14 matches the outer diameter of the shielding ring tube 4, and the clamping blocks are connected by fasteners. It can be adjusted according to the tube diameter of the shielding ring tube 4 to ensure the reliability of clamping.

[0033] The second pipe clamp 15 is fixed to the shielding ring pipe 4. The second pipe clamp 15 and the first clamp 14 are spaced apart along the axial direction of the shielding ring pipe 4, and the second pipe clamp 15 is located between the two first clamps 14. Through this spaced arrangement, the first clamp 14 achieves mechanical fixation of the upper connecting hardware 1 to the shielding ring pipe 4, while the second pipe clamp 15 serves as the end point of the flow path. The two cooperate with each other to achieve functional separation of mechanical force and electrical current flow.

[0034] The two ends of the first flexible conductor welding device 16 are respectively connected to the first female pipe clamp 11 and the second female pipe clamp 15, forming a flow path. The first flexible conductor welding device 16 is set independently of the mechanical force path formed by the first support rod 12 and the first connecting plate 13, and the middle section of the first flexible conductor welding device 16 is in a suspended and free state. Specifically, the first flexible conductor welding device 16 includes a multi-strand stranded flexible conductor and terminals at both ends, which are respectively pressed onto the first female pipe clamp 11 and the second female pipe clamp 15 by bolts. Due to the good flexibility of the flexible conductor, its middle section is in a free state after its two ends are fixed, which can absorb installation errors and thermal expansion and contraction deformation during equipment operation, and does not transmit mechanical loads, thereby avoiding poor contact or breakage caused by deformation under stress. At the same time, the design of this flexible conductor welding device completely separates the flow-through part from the force-bearing part, and the flow-through part exists stably when there is no force, which greatly improves the operational reliability of the fitting.

[0035] The shielding cover welding assembly 17 is fixed to the first connecting plate 13 and located outside the first connecting plate 13, and covers the first flexible wire welding assembly 16. The shielding cover welding assembly 17 completely covers the outside of the first connecting plate 13, the first clamp 14, and the second female clamp 15, and an air gap is left between the inner wall of the shielding cover welding assembly 17 and the first connecting plate 13. The shielding cover welding assembly 17 is made of aluminum alloy plate, and its shape is designed as a cover structure adapted to the internal structure. Installed on the outside of the first connecting plate 13, it can effectively shield the electric field and prevent the hardware from generating corona discharge under high voltage. The setting of the air gap ensures the insulation distance and avoids breakdown between the shielding cover and the internal live parts.

[0036] Specific implementation methods for connecting the lower end fittings: such as Figure 1 , Figures 6 to 8 As shown, the lower connecting fitting 2 includes a third tube clamp 21, a second support rod 22, a second connecting plate 23, a second flexible wire welding assembly 24, and an equalizing ring shield welding assembly 25.

[0037] The third tube clamp 21 is clamped and fixed to the bottom end of the inclined tube 3. Similar to the first tube clamp 11, the third tube clamp 21 is also a split clamp structure, consisting of at least two clamping blocks that are locked and fixed to the lower end of the inclined tube 3 by bolts.

[0038] One end of the second support rod 22 is fixedly connected to the third pipe clamp 21. The structure of the second support rod 22 is the same as or similar to that of the first support rod 12. It can be made of round or square tube profiles, with connecting lugs or threaded structures at both ends. One end of the second support rod 22 is fixedly connected to the third pipe clamp 21 by threaded fasteners, and the other end is connected to the second connecting plate 23.

[0039] One end of the second connecting plate 23 is connected to the other end of the second support rod 22, and the other end of the second connecting plate 23 has a rectangular frame 26 for connecting the equalizing ring. The rectangular frame 26 is a frame-type plate welded structure, welded from multiple aluminum alloy plates. The end of the second connecting plate 23 away from the rectangular frame 26 has a universal joint 27, and the second connecting plate 23 is hinged to the second support rod 22 through the universal joint 27. The universal joint 27 allows the lower connecting hardware 2 to be angled within a certain range during installation, adapting to changes in the on-site installation position, and also absorbing minor displacements and vibrations during equipment operation. The frame-type structure design of the rectangular frame 26 allows the lower connecting hardware 2 to effectively avoid the equalizing ring and valve tower related equipment around the built-in connecting plate, ensuring mechanical strength while meeting flow requirements.

[0040] The two ends of the second flexible conductor welding device 24 are respectively connected to the third pipe clamp 21 and the rectangular frame 26, forming a flow path. Similar to the first flexible conductor welding device 16, the second flexible conductor welding device 24 is set independently of the mechanical force path formed by the second support rod 22 and the second connecting plate 23, and the middle section of the second flexible conductor welding device 24 is in a suspended and free state. The second flexible conductor welding device 24 also includes multi-strand twisted flexible conductors and terminals at both ends, which are respectively bolted to the third pipe clamp 21 and the rectangular frame 26. The second flexible conductor welding device 24 realizes the electrical connection between the inclined pipe 3 and the lower rectangular frame 26 without transmitting any mechanical load, ensuring the reliability and stability of the flow.

[0041] The equalizing ring shielding welding device 25 is fixedly connected to the third female clamp 21 and is located outside the second flexible conductor welding device 24. The equalizing ring shielding welding device 25 is a ring-shaped tubular structure. The equalizing ring shielding welding device 25 is connected to the equalizing ring support plate by a single bolt. The single bolt allows for fine-tuning of the position of the equalizing ring shielding welding device 25 along the installation direction. This single-bolt connection method allows the equalizing ring shielding welding device 25 to be finely adjusted according to the actual position on site during installation, which facilitates installation and reduces assembly difficulty. The setting of the equalizing ring shielding welding device 25 not only realizes the connection with the equalizing ring, but also plays a role in electric field shielding, effectively preventing the hardware from corona formation.

[0042] During installation, firstly, the first tube clamp 11 and the third tube clamp 21 are fixed to the upper and lower ends of the inclined tube 3 respectively, and tightened with bolts. Then, one end of the first support rod 12 is fixedly connected to the first tube clamp 11, and one end of the second support rod 22 is fixedly connected to the third tube clamp 21. Next, the first connecting plate 13 is hinged to the other end of the first support rod 12 with threaded fasteners. After fixing the first clamp 14 to the first connecting plate 13, it is tightly clamped onto the shielding ring tube 4. The second tube clamp 15 is clamped and fixed onto the shielding ring tube 4 and located between the two first clamps 14. The two ends of the first flexible wire welding device 16 are connected to the first tube clamp 11 and the second tube clamp 15 respectively. The shielding cover welding device 17 is fixed to the outside of the first connecting plate 13, covering the first flexible wire welding device 16.

[0043] During the lower assembly, the second connecting plate 23 is hinged to the other end of the second support rod 22 via a universal joint 27. The two ends of the second flexible wire welding assembly 24 are respectively connected to the third pipe clamp 21 and the rectangular frame 26. The equalizing ring shield welding assembly 25 is connected and fixed to the equalizing ring support plate with a single bolt, and can be finely adjusted according to the on-site installation position.

[0044] After all assembly is completed, the upper end is fixed to the shielding ring tube 4 by the first clamp 14, and the lower end is connected to the equalizing ring by the rectangular frame 26. The inclined tube 3 is inclined between the upper and lower ends, and its inclination angle is determined by the length of the first support rod 12 and the angle of the universal joint 27 between the second support rod 22 and the rectangular frame 26.

[0045] The compact and lightweight connection fittings for valve towers in DC converter stations provided in this invention successfully resolve the technical challenge of reliable connection under extreme air clearance by innovatively employing an electro-mechanical-thermal multi-physics coupling system design in the valve tower fittings. The separation of the flow-through components (welded flexible conductors) from the stress-bearing components (support rods, connecting plates, etc.) ensures that the flow path is unaffected by mechanical stress, guaranteeing the reliability of the electrical connection. The installation of shielding covers and equalizing rings effectively prevents corona formation of the fittings under high voltage. The hinged and universal joint connections between components provide ample installation and adjustment margins, reducing processing and installation difficulty. The use of aluminum alloy materials and the design of lightweight holes achieves weight reduction, lowers costs, and reduces assembly workload, providing a replicable technical solution for the compact layout of future UHV equipment.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A compact and lightweight connection fitting for valve towers in DC converter stations, characterized in that, It includes an upper connecting fitting (1), a lower connecting fitting (2), and an inclined tube nut (3) connecting the two. The upper connecting fitting (1) includes a first female tube clamp (11), a first support rod (12), a first connecting plate (13), a first clamp (14), a second female tube clamp (15), a first flexible wire welding device (16), and a shield welding device (17); the first female tube clamp (11) is clamped and fixed to the upper end of the inclined female tube (3); one end of the first support rod (12) is fixedly connected to the first female tube clamp (11), and the first connecting plate (13) is fixedly connected to the other end of the first support rod (12). A clamp (14) is fixed to the first connecting plate (13) and is used to clamp the shielding ring tube (4) of the connecting valve tower; the second tube clamp (15) is clamped and fixed on the shielding ring tube (4); the two ends of the first flexible wire welding device (16) are respectively connected to the first tube clamp (11) and the second tube clamp (15) to form a flow path; the shielding cover welding device (17) is fixed to the first connecting plate (13) and is located outside the first connecting plate (13), and covers the first flexible wire welding device (16). The lower connecting fitting (2) includes a third tube clamp (21), a second support rod (22), a second connecting plate (23), a second flexible wire welding device (24), and an equalizing ring shield welding device (25); the third tube clamp (21) is clamped and fixed to the bottom end of the inclined tube (3); one end of the second support rod (22) is fixedly connected to the third tube clamp (21); one end of the second connecting plate (23) is connected to the other end of the second support rod (22), and the other end of the second connecting plate (23) has a rectangular frame (26) for connecting the equalizing ring; the two ends of the second flexible wire welding device (24) are respectively connected to the third tube clamp (21) and the rectangular frame (26) to form a flow path; the equalizing ring shield welding device (25) is fixedly connected to the third tube clamp (21) and is located outside the second flexible wire welding device (24).

2. The compact and lightweight connection fitting for valve towers in DC converter stations according to claim 1, characterized in that, The rectangular frame (26) is a frame-type plate welded structure. The end of the second connecting plate (23) away from the rectangular frame (26) has a universal joint (27). The second connecting plate (23) is hinged to the second support rod (22) through the universal joint (27).

3. The compact and lightweight connection fitting for a valve tower in a DC converter station according to claim 1, characterized in that, The first clamp (14) is an openable and closable ring clamp structure. The first clamp (14) is fixed to the shielding ring tube (4) by bolts.

4. A compact and lightweight connection fitting for a valve tower in a DC converter station according to claim 1, characterized in that, The second tube clamp (15) and the first clamp (14) are spaced apart along the axial direction of the shielding ring tube (4), and the second tube clamp (15) is located between the two first clamps (14).

5. A compact and lightweight connection fitting for a valve tower in a DC converter station according to claim 1, characterized in that, Both the first flexible wire welding assembly (16) and the second flexible wire welding assembly (24) include multi-strand stranded flexible wires and terminals at both ends, and the terminals are respectively pressed onto the corresponding connectors by bolts.

6. A compact and lightweight connection fitting for a valve tower in a DC converter station according to claim 1, characterized in that, The end of the first support rod (12) is hinged to the first connecting plate (13) by threaded fasteners.

7. A compact and lightweight connection fitting for a valve tower in a DC converter station according to claim 1, characterized in that, The first flexible wire welding device (16) is set independently of the mechanical force path formed by the first support rod (12) and the first connecting plate (13), and the middle section of the first flexible wire welding device (16) is in a suspended and free state.

8. A compact and lightweight connection fitting for a valve tower in a DC converter station according to claim 1, characterized in that, The second flexible wire welding device (24) is set independently of the mechanical force path formed by the second support rod (22) and the second connecting plate (23), and the middle section of the second flexible wire welding device (24) is in a suspended and free state.

9. A compact and lightweight connection fitting for a valve tower in a DC converter station according to claim 1, characterized in that, The shielding cover welding assembly (17) covers the outside of the first connecting plate (13), the first clamp (14) and the second tube clamp (15), and there is an air gap between the inner wall of the shielding cover welding assembly (17) and the first connecting plate (13).

10. A compact and lightweight connection fitting for a valve tower in a DC converter station according to claim 1, characterized in that, The equalizing ring shield welding device (25) is an annular tubular structure. The equalizing ring shield welding device (25) is connected to the equalizing ring support plate by a single bolt. The single bolt allows the equalizing ring shield welding device (25) to be finely adjusted in position along the installation direction.

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