Direct current valve hall wall bushing structure

Abstract

The application provides a DC valve hall wall bushing structure, which comprises a plurality of pipe sections axially sleeved on a current-carrying guide rod, and a moving ring axially movably sleeved outside the pipe sections; the moving ring is driven to move on the pipe sections in a direction close to an adjacent first connecting ring, so as to trigger a first positioning assembly and a second positioning assembly respectively, so that the first positioning assembly locks the relative position between the adjacent first connecting ring and a second connecting ring, and the second positioning assembly locks the relative position of the current-carrying guide rod inside the pipe section. The traditional integrated bushing is improved into a sectional structure with a plurality of pipe sections axially sleeved, so that the transportation, installation and maintenance difficulties of the super-long bushing are effectively solved, the problem of excessive cantilever load caused by the single body being too long and too heavy can be avoided, and the butt joint between the pipe sections and the fixation between the pipe section and the current-carrying guide rod can be conveniently and efficiently completed by driving the moving ring only, so that the structure is stable, the operation is simple, and the mechanical reliability is high.

Description

Technical Field

[0001] This invention relates to the field of power system technology, specifically to a DC valve hall through-wall bushing structure. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] With the rapid development of high-voltage direct current (HVDC) transmission technology, it plays an increasingly crucial role in China's power grid architecture. As one of the core power equipment in HVDC converter stations, the performance of through-wall bushings is directly related to the safe and stable operation of the transmission system.

[0004] Especially in high-altitude or high-seismic-intensity areas, in order to ensure the reliability of the external insulation of electrical equipment in low-pressure environments, altitude correction is usually required, which significantly increases the length of the external insulation. At the same time, in order to meet the mechanical strength requirements under high seismic intensity, reinforcement and thickening are often used to improve the mechanical reliability of the equipment.

[0005] However, the existing conventional "I"-shaped UHVDC through-wall bushings are significantly affected by the substantial increase in the length of the outer insulation. Under cantilever loads, the hollow composite insulators and internal conductors of the bushings bear enormous bending loads. If dynamic stresses from severe conditions such as earthquakes, wind loads, and icing are added, the existing seismic design and the selection and manufacturing of key components have approached or even exceeded their limits. In this situation, simply increasing the bushing diameter and insulator wall thickness to improve strength would lead to a sharp increase in the weight of the mechanically supporting components. This increase in mechanical load often exceeds the increase in mechanical strength, making it difficult for conventional integral bushing structures to meet engineering requirements. Furthermore, the ultra-long and ultra-heavy integral bushings also bring great difficulties to transportation, on-site hoisting, and subsequent maintenance.

[0006] To address this issue, the present invention provides a DC valve hall through-wall bushing structure.

[0007] There is an urgent need to develop a DC valve hall through-wall bushing structure that can effectively solve the above-mentioned mechanical load bottleneck, is easy to transport and install, and has a stable connection. Summary of the Invention

[0008] The main objective of this invention is to provide a DC valve hall through-wall bushing structure that can effectively solve the above-mentioned mechanical load bottleneck, is easy to transport and install, and has a stable connection.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows: a DC valve hall through-wall bushing structure includes multiple pipe sections axially fitted onto a current-carrying guide rod. A first connecting ring and a second connecting ring are respectively fitted at both ends of each pipe section. A movable ring is axially movably fitted onto the outside of each pipe section. A first positioning component and a second positioning component are provided on the pipe section. By driving the movable ring to move towards the adjacent first connecting ring on the pipe section, the first positioning component and the second positioning component are triggered respectively, causing the first positioning component to lock the relative position between the adjacent first connecting ring and the second connecting ring, and causing the second positioning component to lock the relative position of the current-carrying guide rod inside the pipe section.

[0010] Furthermore, one end of the pipe section is provided with a concentrically reduced diameter connecting pipe, and the other end is provided with a mating hole that mates with the connecting pipe.

[0011] Furthermore, the first positioning component includes a plurality of locking rods axially fixed to the side of the moving ring facing the first connecting ring. The plurality of locking rods are evenly distributed in the circumferential direction of the first connecting ring. The second connecting ring has locking holes that cooperate with the locking rods on the side facing the adjacent first connecting ring. The first connecting ring has through holes through which the locking rods pass.

[0012] Furthermore, a locking block is radially elastically inserted into the pipe section, a locking groove that mates with the locking block is opened on the outer wall of the connecting pipe, a sliding groove that allows the locking block to move radially and communicates with the locking hole is opened on the inner side of the second connecting ring, and an oblique hole that mates with the locking rod is opened on the locking block.

[0013] Furthermore, a first spring is provided between the end of the card block away from the docking hole and the corresponding groove wall of the slide.

[0014] Furthermore, the second positioning component includes multiple clamping plates evenly distributed circumferentially on the inner side of the pipe section. The clamping plates are adapted to the current-carrying guide rod, and the multiple clamping plates form a positioning space for clamping and fixing the current-carrying guide rod. It also includes a transmission component, which triggers the transmission component by driving the moving ring to move on the pipe section in a direction close to the first connecting ring, so that the clamping plates move radially along the pipe section and approach the current-carrying guide rod.

[0015] Furthermore, the transmission assembly includes a first cylinder sleeved on the outside of the clamp rod, one end of the first cylinder being rotatably mounted on the corresponding ring wall of the first connecting ring, a spiral groove being axially formed on the inner side of the first cylinder, a protrusion on the outer wall of the clamp rod that mates with the groove, a first conical tooth being sleeved and fixed on the outer side of the first cylinder, a second cylinder being radially inserted into the pipe section, one end of the second cylinder having a second conical tooth that mates with the first conical tooth, and a screw threaded into the other end of the second cylinder, a movable plate being fixed to one end of the screw, and a corresponding clamping plate being elastically connected to one side of the movable plate.

[0016] Furthermore, the inner side of the pipe section is provided with a receiving groove for accommodating the clamping plate. A first telescopic rod is provided between the side of the moving plate away from the clamping plate and the corresponding groove wall of the receiving groove. A second telescopic rod is provided between the moving plate and the clamping plate. A second spring is sleeved on the outer side of the second telescopic rod.

[0017] Furthermore, a fixed plate is provided on the outer wall of the pipe section, and a locking rod is provided on the moving ring. The fixed plate is provided with a screw hole that cooperates with the locking rod.

[0018] Furthermore, it also includes multiple insulating protective sleeves. The outer sides of the first connecting ring and the second connecting ring are each provided with multiple positioning clips along their respective circumferences. The two ends of each insulating protective sleeve are respectively fixed to the outer side of the corresponding pipe section by the corresponding positioning clips.

[0019] The beneficial effects of this invention are reflected in: The DC valve hall through-wall bushing structure of the present invention improves the traditional one-piece bushing into a segmented structure in which multiple pipe sections are axially assembled. This effectively solves the difficulties in transportation, installation and maintenance of ultra-long bushings, avoids the problem of excessive cantilever load caused by excessive length and weight of individual units, and can conveniently and efficiently complete the docking between pipe sections and the fixing between pipe sections and current-carrying guide rods by only driving the moving ring. It has the advantages of stable structure, simple operation and high mechanical reliability. Attached Figure Description

[0020] In the attached diagram: Figure 1 This is a schematic diagram of the multi-segment insulating protective sleeve of the present invention in an assembled state on a current-carrying conductor rod; Figure 2 for Figure 1 A partial structural diagram, with the insulating protective sleeve removed; Figure 3 for Figure 2 A partial cross-sectional view of the structure in which two adjacent pipe sections are locked after assembly and the current-carrying guide rod is locked inside the pipe section. Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 for Figure 3 Enlarged structural diagram at point B; Figure 6 for Figure 3 A partial cross-sectional view of the structure in which two adjacent pipe sections are in an unlocked state after assembly and the current-carrying guide rod is in an unlocked state inside the pipe section. Figure 7 for Figure 6 Enlarged structural diagram at point C; Figure 8 for Figure 3A partial structural diagram showing the distribution of grooves after the first cylinder is unfolded.

[0021] Explanation of reference numerals in the attached figures: 1. Pipe section; 2. Current-carrying guide rod; 3. Moving ring; 4. First connecting ring; 5. Second connecting ring; 6. Clamping rod; 7. Clamping hole; 8. Connecting pipe; 9. Docking hole; 10. Insulating protective sleeve; 11. Clamping block; 12. Clamping groove; 13. Inclined hole; 14. First cylinder; 15. Groove; 16. Protrusion; 17. First conical tooth; 18. Second cylinder; 19. Second conical tooth; 20. Screw; 21. Moving plate; 22. Receiving groove; 23. First telescopic rod; 24. Second telescopic rod; 25. Fixed plate; 26. Locking rod; 27. Screw hole; 28. Positioning clamp; 29. ​​Slide groove; 30. Clamping plate. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the invention, and not all of them. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] Please combine Figures 1 to 8 The DC valve hall through-wall sleeve structure includes multiple pipe sections 1 axially mounted on the current-carrying guide rod 2. The two ends of the pipe section 1 are respectively fitted with a first connecting ring 4 and a second connecting ring 5. The outer side of the pipe section 1 is axially movable and fitted with a movable ring 3. The pipe section 1 is provided with a first positioning component and a second positioning component.

[0024] By driving the moving ring 3 to move on the pipe section 1 in a direction close to the adjacent first connecting ring 4, the first positioning component and the second positioning component are triggered respectively, so that the first positioning component locks the relative position between the adjacent first connecting ring 4 and the second connecting ring 5, and the second positioning component locks the relative position of the current-carrying guide rod 2 inside the pipe section 1.

[0025] In specific implementation, each tube section 1 is sequentially fitted onto the outside of the current-carrying guide rod 2. For the assembly and fixation between two adjacent tube sections 1: first, bring the two adjacent tube sections 1 closer to each other so that the corresponding first connecting ring 4 and second connecting ring 5 abut against each other. At this time, by driving the moving ring 3 on the next tube section 1, the moving ring 3 moves on the tube section 1 to move closer to the adjacent first connecting ring 4 (closer to the position of the previous tube section 1), triggering the first positioning component and the second positioning component respectively. The first positioning component locks the relative position between the adjacent first connecting ring 4 and the second connecting ring 5, thereby completing the position fixation between the two adjacent tube sections 1. At the same time, the second positioning component can lock the relative position of the current-carrying guide rod 2 inside the tube section 1, so that the tube section 1 and the current-carrying guide rod 2 form a stable whole.

[0026] The advantage of this design is that by designing pipe section 1 as a multi-segment assembly and using the first and second positioning components, only the axial movement of the moving ring 3 on pipe section 1 needs to be driven, which can conveniently and efficiently complete the assembly and disassembly of each pipe section 1 and the current-carrying guide rod 2 inside pipe section 1. It is stable and reliable. In this embodiment, the DC valve hall through-wall bushing structure only needs to drive the moving ring 3 outside the pipe section 1 to move axially in a single direction to simultaneously trigger the first positioning component and the second positioning component. While completing the rigid connection and locking between adjacent pipe sections 1, the pipe section 1 simultaneously achieves radial clamping and fixing of the internal current-carrying guide rod 2. This "single action, double locking" design greatly simplifies the on-site assembly process and improves the efficiency and convenience of disassembly and assembly operations.

[0027] In one embodiment, one end of the pipe section 1 is provided with a concentrically narrowed connecting pipe 8, and the other end is provided with a docking hole 9 that mates with the connecting pipe 8, so as to perform preliminary docking of two adjacent pipe sections 1 before assembly and fixing.

[0028] In one embodiment, the first positioning component includes a plurality of locking rods 6 axially fixed to the side of the moving ring 3 facing the first connecting ring 4. The plurality of locking rods 6 are evenly distributed around the first connecting ring 4. The second connecting ring 5 has locking holes 7 that cooperate with the locking rods 6 on the side facing the adjacent first connecting ring 4. The first connecting ring 4 has through holes through which the locking rods 6 pass.

[0029] Thus, by driving the moving ring 3 to move on the pipe section 1 toward the adjacent first connecting ring 4, the locking rod 6 can move through the through hole and be inserted into the locking hole 7 of the second connecting ring 5, thereby achieving mutual locking between the adjacent first connecting ring 4 and the second connecting ring 5, and thus completing the position locking between the two adjacent pipe sections 1.

[0030] In one embodiment, a locking block 11 is radially elastically inserted into the pipe section 1, and a locking groove 12 that mates with the locking block 11 is opened on the outer wall of the connecting pipe 8. A sliding groove 29 that allows the locking block 11 to move radially and communicates with the locking hole 7 is opened on the inner side of the second connecting ring 5. An oblique hole 13 that mates with the locking rod 6 is opened on the locking block 11.

[0031] Thus, when the locking rod 6 is inserted into the locking hole 7, as the moving ring 3 moves further, it can drive the locking rod 6 into the sliding groove 29 to slide and squeeze the inclined hole 13, forcing the locking block 11 to be inserted into the locking groove 12, locking the relative position of the connecting pipe 8 in the docking hole 9, thereby completing the assembly and fixing between the two adjacent pipe sections 1.

[0032] In one embodiment, a first spring is provided between the end of the locking block 11 away from the docking hole 9 and the corresponding groove wall of the slide groove 29.

[0033] Thus, when the locking block 11 is engaged in the locking slot 12, the first spring is in a stretched deformation state, and when the locking rod 6 does not press the oblique hole 13, the first spring is in a non-deformed state.

[0034] In one embodiment, the second positioning component includes a plurality of clamping plates 30 evenly distributed circumferentially on the inner side of the pipe section 1. The clamping plates 30 are adapted to the current-carrying guide rod 2, and the plurality of clamping plates 30 form a positioning space for clamping and fixing the current-carrying guide rod 2. It also includes a transmission component, which is triggered by driving the moving ring 3 to move on the pipe section 1 in a direction close to the first connecting ring 4, so that the clamping plates 30 move radially along the pipe section 1 and approach the current-carrying guide rod 2.

[0035] Thus, by driving the moving ring 3 to move closer to the adjacent first connecting ring 4 on the pipe section 1, and under the transmission action of each transmission component, each clamping plate 30 moves synchronously closer to the surface of the current-carrying guide rod 2, so as to fix the position of the current-carrying guide rod 2 on the inner side of the pipe section 1, so that each pipe section 1 and the current-carrying guide rod 2 form an integral whole, which is safe and stable.

[0036] In one embodiment, the transmission assembly includes a first cylinder 14 sleeved on the outside of the clamping rod 6. One end of the first cylinder 14 is rotatably mounted on the corresponding ring wall of the first connecting ring 4. A spiral groove 15 is axially formed on the inner side of the first cylinder 14. A protrusion 16 that mates with the groove 15 is provided on the outer wall of the clamping rod 6. A first conical tooth 17 is sleeved and fixed on the outer side of the first cylinder 14. A second cylinder 18 is radially inserted into the pipe section 1. One end of the second cylinder 18 is provided with a second conical tooth 19 that mates with the first conical tooth 17. A screw 20 is threaded into the other end of the second cylinder 18. A movable plate 21 is fixed to one end of the screw 20. A corresponding clamping plate 30 is elastically connected to one side of the movable plate 21.

[0037] The inner side of the pipe section 1 is provided with a receiving groove 22 for accommodating the clamping plate 30. A first telescopic rod 23 is provided between the side of the moving plate 21 away from the clamping plate 30 and the corresponding groove wall of the receiving groove 22. A second telescopic rod 24 is provided between the moving plate 21 and the clamping plate 30. A second spring is sleeved on the outside of the second telescopic rod 24.

[0038] Thus, when the locking rod 6 moves toward the locking hole 7, the protrusion 16 can rub and squeeze the groove wall of the spiral groove 15, forcing the first cylinder 14 to rotate in one direction. The first cylinder 14 drives the first bevel tooth 17, the second bevel tooth 19, and the second cylinder 18 to rotate synchronously, so that the second cylinder 18 and the screw 20 have a threaded interaction. Under the combined limiting action of the first telescopic rod 23 and the moving plate 21, the screw 20 drives the moving plate 21, the second telescopic rod 24, and the clamping plate 30 to move synchronously, so that the clamping plate 30 moves closer to the current-carrying guide rod 2. The advantage of this design is that it enables precise docking and self-locking between pipe sections 1. In particular, by utilizing the helical groove 15 and protrusion 16 in conjunction with the corresponding bevel gear transmission, axial movement is converted into radial clamping force, allowing the internal clamping plate 30 to firmly hold the current-carrying guide rod 2. This not only ensures the mechanical strength of the connection points of each pipe section 1, but also makes the pipe section 1 and the current-carrying guide rod 2 form a stable whole, effectively preventing loosening or relative displacement during operation.

[0039] Furthermore, the design of the clamping plate 30, in conjunction with the second spring and the second telescopic rod 24, allows it to adapt to current-carrying guide rods 2 of different diameters, exhibiting good versatility. Simultaneously, the combination of the insulating protective sleeve 10 and the clamping plate 30 made of insulating material ensures that the device provides excellent electrical insulation while fulfilling mechanical support requirements, guaranteeing the safe operation of the DC valve hall.

[0040] In one embodiment, a fixed plate 25 is provided on the outer wall of the pipe section 1, a locking rod 26 is provided on the moving ring 3, and a screw hole 27 that cooperates with the locking rod 26 is provided on the fixed plate 25.

[0041] Thus, when the locking rod 6 is fully inserted into the inclined hole 13 (the locking block 11 is fully inserted into the slot 12), the locking rod 26 is rotated and screwed into the screw hole 27 to further lock the relative position of the locking block 11 in the slot 12 and effectively maintain the clamping state of the current-carrying guide rod 2 by the clamping plate 30.

[0042] In one embodiment, the DC valve hall through-wall bushing structure further includes multiple insulating protective sleeves 10. Multiple positioning clips 28 are provided on the outer sides of the first connecting ring 4 and the second connecting ring 5 along their respective circumferences. The two ends of each insulating protective sleeve 10 are respectively fixed to the outer side of the corresponding pipe section 1 by the corresponding positioning clips 28.

[0043] It should be noted that the insulating protective sleeve 10 can effectively provide insulation protection for the various structures on the pipe section 1, and the clamp 30 is made of insulating material.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0045] It should be noted that if the embodiments of the invention involve directional indicators (such as up and down), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0046] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B. Additionally, if the embodiments of the invention involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the invention.

Claims

1. A DC valve hall through-wall bushing structure, characterized in that, The tube section (1) includes multiple sections axially mounted on the current-carrying guide rod (2). The two ends of the tube section (1) are respectively fitted with a first connecting ring (4) and a second connecting ring (5). A movable ring (3) is axially movable on the outside of the tube section (1). A first positioning component and a second positioning component are provided on the tube section (1). By driving the movable ring (3) to move closer to the adjacent first connecting ring (4) on the tube section (1), the first positioning component and the second positioning component are triggered respectively, so that the first positioning component locks the relative position between the adjacent first connecting ring (4) and the second connecting ring (5), and the second positioning component locks the relative position of the current-carrying guide rod (2) inside the tube section (1).

2. The DC valve hall through-wall bushing structure as described in claim 1, characterized in that, The pipe section (1) has a concentrically narrowed connecting pipe (8) at one end and a mating hole (9) at the other end that mates with the connecting pipe (8).

3. The DC valve hall through-wall bushing structure as described in claim 2, characterized in that, The first positioning component includes multiple locking rods (6) axially fixed on the side of the moving ring (3) facing the first connecting ring (4). The multiple locking rods (6) are evenly distributed around the first connecting ring (4). The second connecting ring (5) facing the adjacent first connecting ring (4) has locking holes (7) that cooperate with the locking rods (6). The first connecting ring (4) has through holes for the locking rods (6) to pass through.

4. The DC valve hall through-wall bushing structure as described in claim 3, characterized in that, A locking block (11) is radially elastically inserted on the pipe section (1). A slot (12) that mates with the locking block (11) is opened on the outer wall of the connecting pipe (8). A sliding groove (29) that allows the locking block (11) to move radially and communicates with the locking hole (7) is opened on the inner side of the second connecting ring (5). An oblique hole (13) that mates with the locking rod (6) is opened on the locking block (11).

5. The DC valve hall through-wall bushing structure as described in claim 4, characterized in that, A first spring is provided between the end of the card block (11) away from the docking hole (9) and the corresponding groove wall of the slide groove (29).

6. The DC valve hall through-wall bushing structure as described in claim 4, characterized in that, The second positioning component includes multiple clamping plates (30) evenly arranged circumferentially on the inner side of the pipe section (1). The clamping plates (30) are adapted to the current-carrying guide rod (2), and the multiple clamping plates (30) form a positioning space for clamping and fixing the current-carrying guide rod (2). It also includes a transmission component, which triggers the transmission component by driving the moving ring (3) to move in the direction close to the first connecting ring (4) on the pipe section (1), so that the clamping plates (30) move radially along the pipe section (1) and approach the current-carrying guide rod (2).

7. The DC valve hall through-wall bushing structure as described in claim 6, characterized in that, The transmission assembly includes a first cylinder (14) sleeved on the outside of the clamp (6). One end of the first cylinder (14) is rotatably mounted on the corresponding ring wall of the first connecting ring (4). A spiral groove (15) is axially opened on the inner side of the first cylinder (14). A protrusion (16) that cooperates with the groove (15) is provided on the outer wall of the clamp (6). A first bevel tooth (17) is sleeved and fixed on the outer side of the first cylinder (14). A second cylinder (18) is radially inserted on the pipe section (1). A second bevel tooth (19) that cooperates with the first bevel tooth (17) is provided at one end of the second cylinder (18). A screw (20) is threaded into the other end of the second cylinder (18). A movable plate (21) is fixed at one end of the screw (20). A corresponding clamp (30) is elastically connected to one side of the movable plate (21).

8. The DC valve hall through-wall bushing structure as described in claim 7, characterized in that, The inner side of the pipe section (1) is provided with a receiving groove (22) for accommodating the clamping plate (30). A first telescopic rod (23) is provided between the side of the moving plate (21) away from the clamping plate (30) and the corresponding groove wall of the receiving groove (22). A second telescopic rod (24) is provided between the moving plate (21) and the clamping plate (30). A second spring is sleeved on the outer side of the second telescopic rod (24).

9. The DC valve hall through-wall bushing structure as described in claim 7, characterized in that, A fixed plate (25) is provided on the outer wall of the pipe section (1), and a locking rod (26) is provided on the moving ring (3). A screw hole (27) that cooperates with the locking rod (26) is provided on the fixed plate (25).

10. The DC valve hall through-wall bushing structure as described in claim 1, characterized in that, It also includes multiple insulating protective sleeves (10), and multiple positioning clips (28) are provided on the outer sides of the first connecting ring (4) and the second connecting ring (5) along their respective circumferences. The two ends of each insulating protective sleeve (10) are respectively fixed to the outer side of the corresponding pipe section (1) by the corresponding positioning clips (28).

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