Direct current distribution network voltage limiting device

Abstract

The application discloses a DC distribution network voltage limiting device, relates to the field of DC distribution network voltage limiting devices, and solves the problem of low energy absorption capacity and difficulty in switching and adjusting the voltage limiting intensity according to requirements when the existing DC distribution network voltage limiting device is used. The device comprises a top plate, a connecting mechanism, a communication mechanism, an adjusting mechanism and multiple sets of voltage limiting elements. Multiple sets of threaded holes are evenly arranged on the top plate, and multiple sets of first screws are fixedly connected to the voltage limiting elements and are in threaded connection with the threaded holes. The connecting mechanism comprises a fixed plate, and a second screw is fixedly connected to the top plate. The communication mechanism comprises multiple sets of conductive rods. The DC distribution network voltage limiting device is installed and connected with the required installation position through the connecting mechanism, the connection state of the conductive rods and the first screws is controlled through the communication mechanism, the number of the voltage limiting elements required to be connected in parallel is adjusted, the length of the connected voltage limiting elements is adjusted through the adjusting mechanism, the resistance intensity is changed, and the voltage limiting intensity is adjusted.

Description

Technical Field

[0001] This invention relates to the field of DC distribution network voltage limiting technology, specifically a DC distribution network voltage limiting device. Background Technology

[0002] DC power distribution network transmission projects generate significant harmonics in the power grid due to the use of power electronic devices. To eliminate these harmonics, the system employs numerous filtering devices. The substantial energy stored in these filters is released to the ground through voltage limiting devices during switch opening and closing. Different DC power distribution network projects have varying energy requirements and rated voltages for voltage limiting devices. Even within the same project, different installation locations present different demands on the energy absorption capacity and rated voltage requirements of voltage limiting devices, resulting in diverse needs for these devices.

[0003] Existing DC distribution network voltage limiting devices are connected using only a single component, resulting in low energy absorption capacity, a simple structure, and a relatively fixed voltage limiting strength that is difficult to switch and adjust. This makes it difficult to adjust the voltage limiting strength to meet different engineering needs, affecting operational efficiency and hindering flexible use in various situations. Therefore, we propose a DC distribution network voltage limiting device. Summary of the Invention

[0004] The purpose of this invention is to provide a DC distribution network voltage limiting device that is easy to adjust the voltage limiting strength and enhances the energy absorption capacity, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a DC distribution network voltage limiting device, comprising a top plate, a connecting mechanism, a communicating mechanism, an adjusting mechanism, and multiple sets of voltage limiting elements. The top plate has multiple sets of threaded holes evenly distributed. Each of the multiple sets of voltage limiting elements has a first screw threadedly connected to the threaded hole. The connecting mechanism includes a fixing plate mounted on the voltage limiting element. A second screw is fixedly connected to the top plate. The connecting mechanism is used to install and connect the top plate and the fixing plate to the desired installation position. The communicating mechanism includes multiple sets of conductive rods slidably connected to the outer wall of the second screw in a vertical direction. The communicating mechanism is used to control the connection state between the conductive rods and the first screw, thereby adjusting the number of voltage limiting elements to be connected in parallel. The adjusting mechanism is mounted on the fixing plate and is used to adjust the length of the connected voltage limiting element, thereby changing the connection resistance and adjusting the voltage limiting strength. Simultaneously, when the adjustment is released, the conductive rods are reset, disengaging the communicating state, facilitating adjustment of the voltage limiting strength and enhancing energy absorption capacity.

[0006] Preferably, the communication mechanism further includes multiple sets of fixing boxes fixedly installed on the top plate. A first spring fixedly connected to the bottom of the conductive rod and fixedly connected to the top plate is fixedly connected. A pressing rod is fixedly connected to the conductive rod. The pressing rod passes through the fixing box and is slidably connected to the fixing box in the vertical direction. A snap-fit ​​block is slidably connected to the fixing box in the horizontal direction. A second spring fixedly connected to one end of the snap-fit ​​block is fixedly connected to the top plate. The adjustment mechanism is used to control the snap-fit ​​state of the snap-fit ​​block during adjustment, so as to facilitate changing the number of parallel-connected voltage limiting elements.

[0007] Preferably, the connecting mechanism further includes a fixing cylinder fixedly installed on the fixing plate, and a third screw is fixedly connected to the bottom of the fixing cylinder to facilitate the installation and connection of the top plate and the fixing plate with the required installation position.

[0008] Preferably, the adjusting mechanism includes an adjusting plate mounted on the fixed plate, a plurality of brushes for sliding connection with the outer wall of the pressure limiting element are fixedly connected to the adjusting plate, a plurality of sliding rods are uniformly fixedly connected to the adjusting plate, the sliding rods pass through the fixed plate and are slidably connected to the fixed plate, a threaded rod is rotatably connected to the bottom end of the top plate, the threaded rod passes through the adjusting plate and is threadedly connected to the adjusting plate, the fixed plate is provided with a driving component for controlling the rotation of the threaded rod, and the threaded rod is provided with a linkage component for linkage control of the locking state of the locking block, so as to facilitate adjustment of the length of the connected pressure limiting element and change the pressure limiting intensity.

[0009] Preferably, the driving component includes a rotating rod rotatably connected to the fixed cylinder. One end of the rotating rod is coaxially fixedly connected to a first bevel gear, and one end of the threaded rod is coaxially fixedly connected to a second bevel gear meshing with the first bevel gear. A crank handle is fixedly connected to the end of the rotating rod away from the first bevel gear. A device groove is provided on the fixed plate, and a limit block is slidably connected in the device groove along the horizontal direction. A limit groove is provided on the threaded rod to insert into the limit block. The limit groove is annular, and a control component for controlling the insertion state of the limit block is provided in the device groove, which facilitates the control of the rotation of the threaded rod for installation and disassembly.

[0010] Preferably, the control component includes a drive ring rotatably connected to the fixed plate, a drive block rotatably connected to the fixed plate fixedly connected to the drive ring, a third spring fixedly connected to the device slot fixedly connected to the limiting block, and a pull rope fixedly connected to the driving block fixedly connected to the limiting block. The pull rope is slidably connected to the device slot to facilitate control of the insertion state of the limiting block.

[0011] Preferably, the linkage includes a rotating ring rotatably connected to the top plate, the rotating ring having multiple sets of arc-shaped grooves evenly distributed on it, a sliding block slidably connected to the bottom of the snap-fit ​​block and the arc-shaped grooves, a rotating disk rotatably connected to the top plate, the rotating disk having multiple sets of guide grooves evenly distributed on it, a toothed block slidably connected in the guide grooves, a fourth spring fixedly connected to one end of the toothed block and the guide grooves, the rotating ring having multiple sets of toothed grooves evenly distributed on it that mesh with the toothed block, and a rotating component on the threaded rod for driving the rotating disk to rotate, facilitating linkage control of the snap-fit ​​block's snap-fit ​​state.

[0012] Preferably, the rotating component includes a rotating shaft coaxially fixedly mounted on the rotating disk, and a transmission belt that is connected to the pulley on the threaded rod via a pulley drive on the rotating shaft, so as to drive the rotating disk to rotate.

[0013] Preferably, a detection terminal is fixedly connected to the pressing rod, a scale groove is provided on the sliding rod, and an arc-shaped conductive sheet is fixedly connected to the bottom of the conductive rod, which facilitates circuit testing and circuit connection, and makes it easy to determine the access value of the voltage limiting element.

[0014] Preferably, the outer wall of the pressure limiting element is uniformly provided with multiple sets of umbrella skirt structures that are slidably connected to the brush, corresponding to different creepage distances, which facilitates connection with the brush and prevents the brush from being connected and energized with multiple umbrella skirt structures at the same time.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention provides a DC distribution network voltage limiting device, which involves installing a second screw and a third screw on a DC distribution network filter device, fixing the first screw to a threaded hole, and fitting an adjusting plate onto the threaded rod until the limiting block is inserted into the limiting groove. At this point, the first bevel gear and the second bevel gear mesh, and the position of the brush is aligned with the umbrella skirt structure of the voltage limiting element. The brush will contact the umbrella skirt structure to form a passage. By turning the crank, the rotating rod is driven to rotate, thereby causing the first bevel gear to drive the threaded rod to rotate. At this time, the limiting block ensures the relative fixation of the fixed plate position. The threaded rod drives the adjusting plate to move up and down, thereby changing the contact position between the brush and the umbrella skirt structure. The length from the first screw to the brush is the resistance length of the limiting element connected to the circuit. The adjustment is simple and convenient.

[0016] 2. The present invention provides a DC distribution network voltage limiting device. By pressing the pressing rod above the voltage limiting element to be connected, the arc-shaped conductive plate below the conductive rod moves down and abuts against the top of the first screw, thereby forming a passage between the first screw, the conductive rod, and the second screw, thus forming a complete passage from the second screw to the third screw. When the conductive rod moves down, it is locked by the locking block to prevent the conductive rod from lifting and loosening. When it is necessary to remove the voltage limiting element, the crank handle is turned in the opposite direction to drive the threaded rod to rotate in the opposite direction, thereby causing the toothed block to drive the toothed groove to rotate the rotating ring in the opposite direction. The arc-shaped groove drives the sliding block to pull out the locking block, compressing the second spring and gradually releasing the obstruction to the conductive rod. The conductive rod is bounced up by the first spring, thereby releasing the connection state.

[0017] 3. The DC distribution network voltage limiting device provided by this invention allows for more accurate determination of the resistance intensity in the connected circuit by observing the scale position of the scale groove. Simultaneously, multiple detection terminals detect the state of the voltage limiting element at each position, ensuring more stable component operation. When the adjusting plate needs to be removed from the voltage limiting element, simply rotating the drive ring causes the drive block to pull the pull rope, thereby pulling the limiting block into the device groove to release the insertion into the limiting groove. At this point, the third spring is compressed, releasing the limit, allowing the fixing plate and adjusting plate to be pulled downwards together for disassembly. By changing the number of parallel voltage limiting elements connected, the absorption capacity can be altered. The evenly spaced umbrella skirt structure facilitates contact and energization with the brushes during adjustment, allowing for different creepage distances. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 This is a schematic diagram of the connection mechanism structure of the present invention; Figure 4 This is a cross-sectional view of the connecting mechanism structure of the present invention; Figure 5 for Figure 4 Enlarged view of region B in the middle; Figure 6 This is a schematic diagram of the adjustment mechanism structure of the present invention; Figure 7 This is a schematic diagram of the adjusting plate structure of the present invention; Figure 8 This is a schematic diagram of the driving component structure of the present invention; Figure 9 This is a cross-sectional view of the adjusting mechanism structure of the present invention; Figure 10 for Figure 9 Enlarged view of region C.

[0019] In the diagram: 1-Top plate; 2-Pressure limiting element; 3-Threaded hole; 4-First screw; 5-Connecting mechanism; 6-Fixing plate; 7-Second screw; 8-Connecting mechanism; 9-Conductive rod; 10-Adjusting mechanism; 11-Fixing box; 12-First spring; 13-Pressing rod; 14-Snap-fit ​​block; 15-Second spring; 16-Fixing cylinder; 17-Third screw; 18-Adjusting plate; 19-Brush; 20-Sliding rod; 21-Threaded rod; 22-Drive component; 23-Linkage component; 24-Rotating rod; 25-First bevel gear; 26-Second bevel gear; 27-Handle; 28-Device groove; 29-Limit block; 30-Limit groove; 31-Control component; 32-Drive ring; 33-Drive block; 34-Third spring; 35-Pull rope; 36-Rotating ring; 37-Arc groove; 38-Sliding block; 39-Rotating disk; 40-Guide groove; 41-Gear block; 42-Fourth spring; 43-Gear groove; 44-Rotating component; 45-Rotating shaft; 46-Transmission belt; 47-Detection terminal; 48-Scale groove; 49-Arc conductive sheet; 50-Umbrella skirt structure. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-10 This invention provides a technical solution: a DC distribution network voltage limiting device, comprising a top plate 1, a connecting mechanism 5, a communicating mechanism 8, an adjusting mechanism 10, and multiple sets of voltage limiting elements 2. The top plate 1 is made of insulating plastic material, and multiple sets of threaded holes 3 are evenly opened on the top plate 1. Each set of voltage limiting elements 2 is fixedly connected with a first screw 4 threaded to the threaded hole 3. The connecting mechanism 5 includes a fixing plate 6 installed on the voltage limiting element 2, a second screw 7 fixedly connected to the top plate 1, and a fixing cylinder 16 fixedly installed on the fixing plate 6. A third screw 17 is fixedly connected to the bottom of the fixing cylinder 16. The connecting mechanism 5 is used to install and connect the top plate 1 and the fixed plate 6 to the required installation position. The connecting mechanism 8 includes multiple sets of conductive rods 9 that are slidably connected to the outer wall of the second screw 7 in the vertical direction. An arc-shaped conductive sheet 49 is fixedly connected to the bottom of the conductive rod 9. The connecting mechanism 8 is used to control the connection state between the conductive rod 9 and the first screw 4, thereby adjusting the number of voltage limiting elements 2 that need to be connected in parallel. The adjusting mechanism 10 is installed on the fixed plate 6 and is used to adjust the length of the connected voltage limiting element 2, thereby changing the connection resistance intensity and adjusting the voltage limiting intensity. At the same time, when the adjustment is released, the conductive rod 9 is reset and the connection state is released.

[0022] The connecting mechanism 8 also includes multiple sets of fixing boxes 11 fixedly installed on the top plate 1. The bottom of the conductive rod 9 is fixedly connected to a first spring 12 fixedly connected to the top plate 1. A pressing rod 13 is fixedly connected to the conductive rod 9. The pressing rod 13 passes through the fixing box 11 and is slidably connected to the fixing box 11 in the vertical direction. A detection terminal 47 is fixedly connected to the pressing rod 13. A snap-fit ​​block 14 is slidably connected to the fixing box 11 in the horizontal direction. A second spring 15 is fixedly connected to the top plate 1 and fixedly connected to one end of the snap-fit ​​block 14. The adjusting mechanism 10 is used to control the snap-fit ​​state of the snap-fit ​​block 14 during adjustment.

[0023] The adjustment mechanism 10 includes an adjustment plate 18 mounted on a fixed plate 6. Multiple sets of brushes 19 for sliding connection with the outer wall of the pressure limiting element 2 are fixedly connected to the adjustment plate 18. Multiple sets of umbrella skirt structures 50 for sliding connection with the brushes 19 are uniformly provided on the outer wall of the pressure limiting element 2. Multiple sets of sliding rods 20 are uniformly fixedly connected to the adjustment plate 18. The sliding rods 20 are provided with scale grooves 48. The sliding rods 20 pass through the fixed plate 6 and are slidably connected to the fixed plate 6. A threaded rod 21 is rotatably connected to the bottom end of the top plate 1. The threaded rod 21 passes through the adjustment plate 18 and is threadedly connected to the adjustment plate 18. The fixed plate 6 is provided with a drive member 22 for controlling the rotation of the threaded rod 21. The threaded rod 21 is provided with a linkage member 23 for linkage control of the locking state of the locking block 14.

[0024] The driving component 22 includes a rotating rod 24 rotatably connected to the fixed cylinder 16. One end of the rotating rod 24 is coaxially fixedly connected to a first bevel gear 25. One end of the threaded rod 21 is coaxially fixedly connected to a second bevel gear 26 that meshes with the first bevel gear 25. A crank handle 27 is fixedly connected to the end of the rotating rod 24 away from the first bevel gear 25. A device groove 28 is provided on the fixed plate 6. A limit block 29 is slidably connected in the device groove 28 along the horizontal direction. A limit groove 30 is provided on the threaded rod 21 that is inserted into the limit block 29. The limit groove 30 is annular. A control component 31 for controlling the insertion state of the limit block 29 is provided in the device groove 28.

[0025] The control component 31 includes a drive ring 32 rotatably connected to the fixed plate 6, a drive block 33 rotatably connected to the fixed plate 6 fixedly connected to the drive ring 32, a third spring 34 fixedly connected to the device groove 28 fixedly connected to the limit block 29, a pull rope 35 fixedly connected to the limit block 29 and the drive block 33 fixedly connected to the limit block 29, and the pull rope 35 slidably connected to the device groove 28.

[0026] The linkage 23 includes a rotating ring 36 rotatably connected to the top plate 1. Multiple sets of arc-shaped grooves 37 are evenly provided on the rotating ring 36. A sliding block 38 that is slidably connected to the bottom of the snap-fit ​​block 14 is fixedly connected to the bottom of the arc-shaped groove 37. A rotating disk 39 is rotatably connected to the top plate 1. Multiple sets of guide grooves 40 are evenly provided on the rotating disk 39. A toothed block 41 is slidably connected in the guide groove 40. A fourth spring 42 that is fixedly connected to the guide groove 40 is fixedly connected to one end of the toothed block 41. Multiple sets of toothed grooves 43 that mesh with the toothed block 41 are evenly provided on the rotating ring 36. A rotating component 44 for driving the rotating disk 39 to rotate is provided on the threaded rod 21. The rotating component 44 includes a rotating shaft 45 that is coaxially fixedly installed on the rotating disk 39. A transmission belt 46 that is connected to the pulley on the threaded rod 21 is driven by a pulley on the rotating shaft 45.

[0027] By installing the second screw 7 and the third screw 17 on the DC distribution network filter equipment respectively, and fixing the first screw 4 with the threaded hole 3, the adjusting plate 18 is sleeved on the threaded rod 21 until the limiting block 29 is inserted into the limiting groove 30. At this time, the first bevel gear 25 and the second bevel gear 26 mesh, and the position of the brush 19 is aligned with the position of the umbrella skirt structure 50 of the voltage limiting element 2. The brush 19 will contact the umbrella skirt structure 50 to form a passage. By turning the rocker handle 27, the rotating rod 24 is driven to rotate, thereby causing the first bevel gear 25 to drive the second bevel gear 26 to rotate, and the threaded rod 21 to rotate. At this time, the limiting block 29 ensures that the position of the fixed plate 6 is relatively fixed. At this time, the threaded rod 21 drives the adjusting plate 18 to move up and down, thereby changing the contact position between the brush 19 and the umbrella skirt structure 50. The length from the first screw 4 to the position of the brush 19 is the resistance length of the limiting element connected to the circuit. The adjustment is simple and convenient.

[0028] By pressing the lever 13 above the pressure limiting element 2 to be connected, the arc-shaped conductive plate 49 below the conductive rod 9 moves down to contact the top of the first screw 4, thus forming a passage between the first screw 4, the conductive rod 9, and the second screw 7. At this time, the adjusting plate 18, the sliding rod 20, the fixing plate 6, the fixing cylinder 16, and the third screw 17 are all conductive structures, thus forming a complete passage from the second screw 7 to the third screw 17. When the conductive rod 9 moves down, it is engaged by the locking block 14 to prevent the conductive rod 9 from lifting and loosening. At this time, when the threaded rod 21 rotates, it will drive the transmission belt 46 to rotate the rotating shaft 45 and the rotating disk 39. 39 drives the toothed block 41 to continuously push the toothed groove 43, causing the rotating ring 36 to have a rotational tendency. However, at this time, the rotational drive causes the arc-shaped groove 37 to push the sliding block 38 to make the snap-fit ​​block 14 slide into the fixed box 11, making the snap-fit ​​force greater. Conversely, when it is necessary to remove the pressure limiting element 2, the handle 27 is turned in the opposite direction to drive the threaded rod 21 to rotate in the opposite direction, so that the toothed block 41 drives the toothed groove 43 to make the rotating ring 36 rotate in the opposite direction. The arc-shaped groove 37 will drive the sliding block 38 to pull out the snap-fit ​​block 14, compress the second spring 15, and gradually release the obstruction to the conductive rod 9. The conductive rod 9 is bounced up by the first spring 12, thereby releasing the connection state.

[0029] The resistance strength in the circuit can be determined by observing the scale position of the scale groove 48, making the judgment more accurate. At the same time, the status of the voltage limiting element 2 at this position is detected by multiple detection terminals 47, making the component operation more stable. When it is necessary to remove the adjustment plate 18 from the voltage limiting element 2, simply rotate the drive ring 32 to drive the drive block 33 to pull the pull rope 35, thereby pulling the limit block 29 into the device groove 28 to release the insertion of the limit groove 30. At this time, the third spring 34 is compressed to release the limit, and the fixing plate 6 and the adjustment plate 18 can be pulled down together to complete the disassembly. By changing the number of parallel voltage limiting elements 2 connected, the absorption capacity can be changed. The umbrella skirt structure 50 is set at equal intervals for different creepage distances, which also facilitates the disconnection of the brush 19 during adjustment. When the two ends of the parallel voltage limiting element 2 are subjected to overvoltage, the current non-uniformity coefficient of different voltage limiting elements 2 is less than 1.05. The insulating jacket of the voltage limiting element 2 is made of silicone rubber of different colors to meet the needs of different DC distribution network projects.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A DC distribution network voltage limiting device, characterized in that, include: The system includes a top plate (1) and multiple pressure limiting elements (2), wherein multiple sets of threaded holes (3) are evenly provided on the top plate (1), and a first screw (4) is fixedly connected to each of the multiple sets of pressure limiting elements (2) and threadedly connected to the threaded holes (3); it also includes a connecting mechanism (5), wherein the connecting mechanism (5) includes a fixing plate (6) installed on the pressure limiting elements (2), and a second screw (7) is fixedly connected to the top plate (1); the connecting mechanism (5) is used to install and connect the top plate (1) and the fixing plate (6) to the required installation position; The connecting mechanism (8) includes multiple sets of conductive rods (9) that are slidably connected to the outer wall of the second screw (7) in the vertical direction. The connecting mechanism (8) is used to control the connection state between the conductive rods (9) and the first screw (4), thereby adjusting the number of the voltage limiting elements (2) to be connected in parallel as required. The adjustment mechanism (10) is installed on the fixed plate (6) and is used to adjust the length of the connected voltage limiting element (2) to change the connected resistance strength and adjust the voltage limiting strength. At the same time, when the adjustment is released, the conductive rod (9) is reset and the connection state is released. The connection mechanism (8) also includes multiple sets of fixed boxes (11) fixedly installed on the top plate (1). The bottom of the conductive rod (9) is fixedly connected to a first spring (12) fixedly connected to the top plate (1). A pressing rod (13) is fixedly connected to the conductive rod (9). The pressing rod (13) passes through the fixed box (11) and is slidably connected to the fixed box (11) in the vertical direction. A snap-fit ​​block (14) is slidably connected to the fixed box (11) in the horizontal direction. A second spring (15) is fixedly connected to one end of the snap-fit ​​block (14) on the top plate (1). The adjustment mechanism (10) is used to control the snap-fit ​​state of the snap-fit ​​block (14) during adjustment. The connecting mechanism (5) further includes a fixed cylinder (16) fixedly installed on the fixed plate (6). A third screw (17) is fixedly connected to the bottom of the fixed cylinder (16). The adjusting mechanism (10) includes an adjusting plate (18) installed on the fixed plate (6). Multiple sets of brushes (19) for sliding connection with the outer wall of the pressure limiting element (2) are fixedly connected on the adjusting plate (18). Multiple sets of sliding rods (20) are evenly fixedly connected on the adjusting plate (18). The sliding rods (20) penetrate the fixed plate (6) and are slidably connected to the fixed plate (6). A threaded rod (21) is rotatably connected to the bottom end of the top plate (1). The threaded rod (21) penetrates the adjusting plate (18) and is threadedly connected to the adjusting plate (18). The fixed plate (6) is provided with a driving member (22) for controlling the rotation of the threaded rod (21). The threaded rod (21) is provided with a linkage member (23) for linkage control of the locking state of the locking block (14).

2. The DC distribution network voltage limiting device according to claim 1, characterized in that: The driving component (22) includes a rotating rod (24) rotatably connected to the fixed cylinder (16). One end of the rotating rod (24) is coaxially fixedly connected to a first bevel gear (25). One end of the threaded rod (21) is coaxially fixedly connected to a second bevel gear (26) meshing with the first bevel gear (25). A crank handle (27) is fixedly connected to the end of the rotating rod (24) away from the first bevel gear (25). A device groove (28) is provided on the fixed plate (6). A limit block (29) is slidably connected in the device groove (28) along the horizontal direction. A limit groove (30) is provided on the threaded rod (21) and is inserted into the limit block (29). The limit groove (30) is annular. A control component (31) for controlling the insertion state of the limit block (29) is provided in the device groove (28).

3. A DC distribution network voltage limiting device according to claim 2, characterized in that: The control component (31) includes a drive ring (32) rotatably connected to the fixed plate (6), a drive block (33) rotatably connected to the fixed plate (6) fixedly connected to the drive ring (32), a third spring (34) fixedly connected to the device groove (28) fixedly connected to the limiting block (29), a pull rope (35) fixedly connected to the drive block (33) fixedly connected to the limiting block (29), and the pull rope (35) slidably connected to the device groove (28).

4. A DC distribution network voltage limiting device according to claim 1, characterized in that: The linkage component (23) includes a rotating ring (36) rotatably connected to the top plate (1). Multiple sets of arc grooves (37) are evenly provided on the rotating ring (36). A sliding block (38) that is slidably connected to the arc groove (37) is fixedly connected to the bottom of the snap-fit ​​block (14). A rotating disk (39) is rotatably connected to the top plate (1). Multiple sets of guide grooves (40) are evenly provided on the rotating disk (39). A toothed block (41) is slidably connected in the guide groove (40). A fourth spring (42) that is fixedly connected to the guide groove (40) is fixedly connected to one end of the toothed block (41). Multiple sets of toothed grooves (43) that mesh with the toothed block (41) are evenly provided on the rotating ring (36). A rotating component (44) for driving the rotating disk (39) to rotate is provided on the threaded rod (21).

5. A DC distribution network voltage limiting device according to claim 4, characterized in that: The rotating component (44) includes a rotating shaft (45) coaxially fixed on the rotating disk (39), and a transmission belt (46) connected to the pulley on the threaded rod (21) via a pulley drive on the rotating shaft (45).

6. A DC distribution network voltage limiting device according to claim 1, characterized in that: The pressing rod (13) is fixedly connected to a detection terminal (47), the sliding rod (20) is provided with a scale groove (48), and the bottom of the conductive rod (9) is fixedly connected to an arc-shaped conductive sheet (49).

7. A DC distribution network voltage limiting device according to claim 1, characterized in that: The outer wall of the pressure limiting element (2) is uniformly provided with multiple sets of umbrella skirt structures (50) that are slidably connected to the brush (19).

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