A fast disconnect switch for DC distribution network

Abstract

The present invention discloses a fast disconnector for a DC distribution network, which relates to the technical field related to disconnectors. In order to solve the problem in the prior art that the moving contact piece is always charged, and the moving contact piece is a structure that is both driven to rotate and conduct electricity, and has a large overall volume, if it deviates from the normal position due to external force impact and other reasons in the open state, and comes into contact with other metal parts of the disconnector, it may cause a short circuit. The first isolation component includes a first insulator, the upper end of the first insulator is equipped with a first contact piece, the inner side of the upper end of the first contact piece is equipped with a contact seat, and the upper end of the contact seat is equipped with a first static contact piece; the second isolation component includes a second insulator, the upper end of the second insulator is equipped with a second contact piece, and the inner side of the upper end of the second contact piece is equipped with a second static contact piece; a dynamic contact component is provided between each set of two bearing fixing plates along the outside of the third connecting shaft.

Description

Technical Field

[0001] The present invention relates to the technical field related to disconnectors, and in particular to a fast disconnector for a DC distribution network. Background Art

[0002] With the global energy transition and growing electricity demand, DC distribution networks, due to their unique advantages, are becoming a key trend in future urban distribution network construction. Compared to traditional AC distribution networks, DC distribution networks offer high power transmission efficiency, low line losses, greater control flexibility, and easy integration with distributed energy sources (such as solar and wind power). Since the concept of DC distribution systems was proposed, they have attracted widespread attention from scholars and power companies both domestically and internationally.

[0003] During the construction and operation of DC distribution networks, fault isolation technology is crucial for ensuring their safe and reliable operation. Due to the low damping of DC systems, once a short-circuit fault occurs, the current will rise rapidly, seriously threatening equipment safety. This is particularly true for critical equipment such as modular multilevel converters (MMCs). Failure to promptly and effectively isolate the fault can cause components such as the insulated-gate bipolar transistors (IGBTs) in the submodules to burn out, resulting in significant economic losses or even personal injury. Furthermore, DC short-circuit currents do not naturally cross zero, making it impossible to directly utilize the arc-interrupting principle of AC circuit breakers for fault isolation. This presents additional technical challenges for fault isolation in DC distribution networks.

[0004] Given the complexity and importance of fault isolation technology in DC distribution networks, the development of efficient and reliable DC disconnectors has become a top priority. As key equipment in DC distribution networks, DC disconnectors' primary function is to rapidly disconnect the faulty line when a system fault occurs, preventing the fault from spreading and ensuring normal power supply to non-faulty areas. Therefore, the design of fast disconnectors for DC distribution networks must not only possess high-speed response capabilities but also excellent insulation performance and dynamically stable conductivity to adapt to the high voltage and high current operating environment of DC systems.

[0005] For example, the Chinese authorized patent with announcement number CN 205388952 U (a disconnector with accurate and fast opening and closing) includes a base, an insulator, a contact seat, a locking plate, a locking ring, a contact knife, and a limit seat. The lower part of the contact knife is provided with a lifting ear, and also includes a gas spring and a gas spring seat. The gas spring seat is fixedly mounted on the base, and the gas spring seat is provided with an ear plate located to the lower right of the lifting ear. One end of the gas spring is hinged to the lifting ear, and the other end is hinged to the ear plate. The structure adopted by the utility model can make the disconnector open and close accurately, without relying on the experience of the operator, and effectively solves the problem of equipment being energized due to improper opening of the disconnector and accelerated aging of the equipment due to improper closing.

[0006] Although the above-mentioned existing technology has good insulation performance and dynamic stable conductive performance, after the switch is opened and the power is cut off, it only cuts off the current of the circuit formed by the moving contact plate and the static contact plate. The moving contact plate is always energized. The moving contact plate is a structure that is driven to rotate and conduct electricity. The overall volume is large. If it deviates from the normal position due to external force impact or other reasons in the open state and comes into contact with other metal parts of the disconnector, it may cause a short circuit. Summary of the Invention

[0007] The object of the present invention is to provide a fast disconnector for a DC distribution network to solve the problem that the moving contact piece is always energized as proposed in the above-mentioned background technology. The moving contact piece is a structure that is driven to rotate and conduct electricity. The overall volume is relatively large. If it deviates from the normal position due to external force impact or other reasons in the open state and comes into contact with other metal parts of the disconnector, it may cause a short circuit.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a fast disconnector for a DC distribution network, comprising a lower support frame, a longitudinal connecting frame fixed to the upper end of the lower support frame, disconnector units mounted equidistantly from front to rear on the upper end of the longitudinal connecting frame, the disconnector units comprising a transverse connecting frame, the transverse connecting frame being provided with two support plates;

[0009] A first isolation assembly is provided at the upper end of the support plate on one side, the first isolation assembly includes a first insulator, a first contact piece is installed at the upper end of the first insulator, the first contact piece extends outward, a contact seat is installed on the inner side of the upper end of the first contact piece, and a first static contact piece is installed at the upper end of the contact seat;

[0010] A second isolation assembly is provided at the upper end of the support plate on the other side, and the second isolation assembly includes a second insulator, a second contact piece is installed on the upper end of the second insulator, the second contact piece extends outward, and a second static contact piece is installed on the inner side of the upper end of the second contact piece. A bearing fixing plate is fixed to the upper end of the second insulator along both ends of the second contact piece, and a third connecting shaft passes through the bearing fixing plate on the plurality of isolating switch units, and the third connecting shaft is rotatably connected to the bearing fixing plate;

[0011] A dynamic electric shock component is provided between each group of two bearing fixing plates along the outside of the third connecting shaft, and the dynamic electric shock component includes a third rotating block, which is fixed to the third connecting shaft, and a dynamic electric shock rod is fixed to the side of the third rotating block close to the first isolation component, and the front and rear ends of the other end of the dynamic electric shock rod are integrally connected with the first dynamic electric shock sheet, and the two first dynamic electric shock sheets are located at both ends of the first static electric shock sheet and are electrically connected to the first static electric shock sheet, and the front and rear ends of the lower end of the dynamic electric shock rod close to the second isolation component are integrally connected with the second dynamic electric shock sheet. The two second dynamic contact sheets are located at both ends of the second static contact sheet and are electrically connected to the second static contact sheet.

[0012] Preferably, the lower support frame includes a plurality of support columns, and a connecting cross plate is fixed to the outside of the plurality of support columns. A support platform is fixed to the side of the connecting cross plate close to the second isolation component. An equipment installation box is installed at the upper end of the support platform, and an inspection port is opened on the end face of the equipment installation box.

[0013] Preferably, a driving motor is installed in the middle of the front end of the equipment installation box, a fan-shaped driving gear is installed inside the equipment installation box along the output shaft end of the driving motor, a second rotating gear is installed inside the equipment installation box along one side of the fan-shaped driving gear, the second rotating gear is intermittently meshed with the fan-shaped driving gear, the intermediate shaft of the second rotating gear extends to the rear end of the equipment installation box and is connected to the first transmission wheel, a second transmission wheel is installed on the upper end of one side of the rear end of the equipment installation box, and the second transmission wheel is connected to the first transmission wheel through a transmission belt.

[0014] Preferably, the intermediate shaft of the second transmission wheel is set as a second connecting shaft, the second connecting shaft passes through the equipment installation box and extends to the front and rear ends respectively, the outside of the second connecting shaft is equidistantly installed with first bevel gears from front to back, the rear end of the upper end of the first bevel gear is meshed and connected with the second bevel gear, the upper end of the second bevel gear is fixed with a threaded rod, the external thread of the threaded rod is connected with a threaded sleeve, and the upper end of the threaded sleeve is fixed with an insulating lifting rod.

[0015] Preferably, a limit assembly is provided at the lower end between the two bearing fixing plates on each of the isolating switch units, and the limit assembly includes a lifting plate, an insulating lifting rod is connected to the lifting plate through the second insulator, and rotation grooves are symmetrically opened on both sides of the lifting plate, and a limit block is rotatably connected in the rotation groove. The limit block extends upward and is integrally connected to the limit head, the upper end surface of the limit head is the second inclined surface, and the lower end surface of the limit head is the first inclined surface, and the cross-section of the limit head forms a trapezoidal structure with the short side on the outside.

[0016] Preferably, a pressure spring is installed between the two limit heads on each limit assembly, the inner side surface of the rotating groove on the lifting plate is set as a limit inclined surface, the two limit inclined surfaces are inclined inwardly and the two limit inclined surfaces are symmetrically arranged.

[0017] Preferably, a rectangular limit cavity is opened at the lower end of the interior of the third rotating block, and the height and width of the rectangular limit cavity match the size of the limit head. A rectangular groove is opened on the lower end surface of the third rotating block, and the rectangular groove is connected to the rectangular limit cavity. The length of the rectangular groove is greater than the sum of the lengths of the two limit heads.

[0018] Preferably, a vertical limiting sliding groove is provided at the lower end of the inner end surface of the bearing fixing plate, and vertical limiting sliding blocks are integrally connected to both ends of the lifting plate, and the vertical limiting sliding blocks slide along the vertical limiting sliding groove.

[0019] Preferably, a second linkage rod is provided outside the third connecting shaft along the rear end of each group of the bearing fixing plates, the second linkage rod is fixed to the third connecting shaft, the other end inside the second linkage rod is rotatably connected to a second rotating block via an axis, a third insulator is fixed to the lower end of the second rotating block, a first rotating block is fixed to the lower end of the third insulator, the other end of the first rotating block extends into the first linkage rod and is rotatably connected to the first linkage rod via an axis, the other end of the first linkage rod is fixed to a first connecting shaft, and the first connecting shaft passes through and connects to the first linkage rods on the plurality of isolating switch units;

[0020] A first rotating gear is provided inside the equipment installation box along the other side of the sector drive gear. The first rotating gear is intermittently meshed with the sector drive gear. The first connecting shaft passes through the equipment installation box and is fixed to the first rotating gear through a keyway.

[0021] Preferably, first conductive springs are fixed to both ends of the first static contact piece, and second conductive springs are fixed to both ends of the second static contact piece.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In this invention, after the switch is opened, the second moving contact piece is separated from the outside of the first static contact piece and the first conductive spring piece, and the first moving contact piece is separated from the outside of the second static contact piece and the second conductive spring piece; so that the power of the first conductive spring piece and the second conductive spring piece is disconnected. The dynamic contact component, as a dynamic component, is not connected to the charged structure in this state, and is not charged itself. The dynamic contact component is completely separated from the static contact piece, effectively isolating the current, and will not cause a short circuit even if there is an external force impact. This solves the current problem that the dynamic contact piece is always charged, and the dynamic contact piece, as a structure that is driven to rotate and conduct electricity, has a large overall volume. If it deviates from the normal position due to external force impact and other reasons in the open state, and comes into contact with other metal parts of the disconnector, it may cause a short circuit.

[0024] 2. In this invention, the first static contact piece and the second static contact piece are respectively equipped with conductive springs to ensure that a stable conductive path is formed during the contact process, reduce contact resistance, and improve current transmission efficiency.

[0025] 3. In this invention, when the circuit breaker needs to be opened, the drive motor drives the sector drive gear to rotate counterclockwise. Since the teeth of the sector drive gear are meshed with the second rotating gear at this time and there is no meshing relationship with the first rotating gear, the second rotating gear can be driven to rotate clockwise. The first transmission wheel rotates clockwise synchronously. The transmission belt drives the second transmission wheel, the second connecting shaft and the first bevel gear to rotate clockwise. The second bevel gear drives the threaded rod to rotate counterclockwise. The threaded connection between the threaded rod and the threaded sleeve drives the threaded sleeve, the insulating lifting rod and the limit assembly to move downward. The first inclined surface of the upper limit head of the limit assembly contacts the side of the rectangular groove, pressing each group of two limit blocks to rotate inward, compressing the pressure spring. As the sector drive gear rotates, the limit assembly moves downward until the limit head moves downward and disengages from the third rotating block on the dynamic electric shock assembly. The pressure spring pushes the limit block to reset, releasing the limit assembly from limiting the dynamic electric shock assembly. In the closed state, the limit assembly limits the dynamic contact assembly, preventing it from being directly driven to rotate. This maintains electrical conductivity between the first isolation assembly, the dynamic contact assembly, and the second isolation assembly. Only after the limit is released can the dynamic contact assembly be driven to rotate to open the circuit breaker. This ensures smooth operation of the disconnector during opening and closing, reduces failures caused by mechanical vibration or impact, and improves system stability and reliability.

[0026] 4. In this invention, the second rotating gear is intermittently engaged with the sector-shaped drive gear, and the first rotating gear is intermittently engaged with the sector-shaped drive gear, so that the entire drive only needs to introduce one drive structure to avoid structural redundancy; and the two-part engagement process respectively realizes the limiting process and the opening and closing process. The operation process is a sequential operation, and the operation steps are smooth and integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of a fast disconnect switch for a DC distribution network according to the present invention from a main perspective;

[0028] Figure 2 This is a schematic diagram of the overall structure of a fast disconnect switch for a DC distribution network according to the present invention, viewed from above;

[0029] Figure 3 This is a front view of a fast disconnect switch for a DC distribution network according to the present invention;

[0030] Figure 4 A side view of a fast disconnect switch for a DC distribution network according to the present invention;

[0031] Figure 5 A top view of a fast disconnect switch for a DC distribution network according to the present invention;

[0032] Figure 6 This is a structural cross-sectional view of a fast disconnect switch for a DC distribution network at position AA of the present invention;

[0033] Figure 7 This is a structural schematic diagram of a first isolation component of a fast isolating switch for a DC distribution network according to the present invention;

[0034] Figure 8 This is a structural schematic diagram of a second isolation component of a fast isolating switch for a DC distribution network according to the present invention;

[0035] Figure 9 This is a structural schematic diagram of a dynamic electric shock component of a fast disconnect switch for a DC distribution network of the present invention;

[0036] Figure 10 A cross-sectional view of the connection relationship between the third rotating block and the limit assembly of a fast disconnect switch for a DC distribution network of the present invention;

[0037] Figure 11 This is a structural schematic diagram of a limit assembly of a fast disconnect switch for a DC distribution network according to the present invention;

[0038] Figure 12 This is a structural cross-sectional view at position BB of a fast disconnector for a DC distribution network according to the present invention;

[0039] Figure 13 The present invention is a schematic structural diagram of a device installation box drive structure for a fast disconnect switch for a DC distribution network.

[0040] In the figure: 1. lower support frame; 2. support column; 3. connecting cross plate; 4. support platform; 5. equipment installation box; 6. inspection port; 7. drive motor; 8. sector drive gear; 9. first rotating gear; 10. second rotating gear; 11. first connecting shaft; 12. first linkage rod; 13. first rotating block; 14. first transmission wheel; 15. second transmission wheel; 16. transmission belt; 17. second connecting shaft; 18. first bevel gear; 19. longitudinal connecting frame; 20. isolating switch unit; 21. transverse connecting frame; 22. support plate; 23. first isolating assembly; 24. second isolating assembly; 25. first insulator; 26. first contact piece; 27. contact seat; 28. first static contact piece; 29. ​​first conductive spring; 30. second insulator; 3 1. Second contact piece; 32. Second static contact piece; 33. Second conductive spring piece; 34. Bearing fixing plate; 35. Vertical limit sliding groove; 36. Third connecting shaft; 37. Second linkage rod; 38. Second rotating block; 39. Third insulator; 40. Dynamic contact assembly; 41. Third rotating block; 42. Rectangular groove; 43. Rectangular limit cavity; 44. Dynamic contact rod; 45. First dynamic contact piece; 46. Second dynamic contact piece; 47. Second bevel gear; 48. Threaded rod; 49. Threaded sleeve; 50. Insulating lifting rod; 51. Limit assembly; 52. Lifting plate; 53. Vertical limit sliding block; 54. Rotating groove; 55. Limit block; 56. Limit head; 57. First inclined surface; 58. Second inclined surface; 59. Pressure spring; 60. Limit inclined surface. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] 1. Overall structure

[0043] This embodiment provides a fast disconnector for a DC distribution network, comprising a lower support frame 1, a longitudinal connecting frame 19 being fixed to its upper end. Multiple disconnector units 20 are equidistantly mounted on the longitudinal connecting frame 19. Each disconnector unit 20 includes a transverse connecting frame 21, on which two support plates 22 are mounted. A first disconnector assembly 23 is mounted on the upper end of one support plate 22, and a second disconnector assembly 24 is mounted on the upper end of the other support plate 22.

[0044] The lower support frame 1 includes multiple support columns 2, and a connecting cross plate 3 is commonly fixed to the outside of the multiple support columns 2. A support platform 4 is fixed to the side of the connecting cross plate 3 close to the second isolation component 24. An equipment installation box 5 is installed on the upper end of the support platform 4. An inspection port 6 is provided on the end face of the equipment installation box 5. The installation position of the inspection port 6 is not restricted, and a door body is installed at the position of the inspection port 6 through a hinge. A rainproof structure can also be provided at the upper end of the equipment installation box 5, and this part of the structure is waterproofed.

[0045] 2. Isolate components

[0046] The first isolation component 23 includes a first insulator 25, which ensures electrical isolation. A first contact piece 26 is installed at the upper end of the first insulator 25, which extends outward for easy operation. A contact seat 27 is installed on the inner side of the upper end of the first contact piece 26, and a first static contact piece 28 is installed on the upper end of the contact seat 27. The contact seat 27 firmly mounts the first static contact piece 28. First conductive springs 29 are fixed at both ends of the first static contact piece 28 to enhance the conductive performance.

[0047] The second isolation assembly 24 has a similar structure to the first isolation assembly 23 and includes a second insulator 30. A second contact piece 31 is mounted on the upper end of the second insulator 30. The second contact piece 31 extends outward, and a second static contact piece 32 is mounted on the inner side of the upper end of the second contact piece 31. Second conductive springs 33 are fixed to both ends of the second static contact piece 32. A bearing fixing plate 34 is fixed to the upper end of the second insulator 30 along both ends of the second contact piece 31 for mounting a third connecting shaft 36. The third connecting shaft 36 is rotatably connected to the bearing fixing plate 34 to enable rotation of the dynamic contact assembly 40. This assembly works in conjunction with the first isolation assembly to ensure smooth opening and closing operations.

[0048] 3. Dynamic electric shock components and transmission mechanisms

[0049] Dynamic electric shock component 40: located between each group of two bearing fixing plates 34 along the outside of the third connecting shaft 36; includes a third rotating block 41, the third rotating block 41 is fixed to the third connecting shaft 36, and a dynamic electric shock rod 44 is fixed to the side of the third rotating block 41 close to the first isolation component 23, and the front and rear ends of the other end of the dynamic electric shock rod 44 are integrally connected with the first dynamic electric shock sheet 45. The two first dynamic electric shock sheets 45 are located at both ends of the first static electric shock sheet 28 and are electrically connected to the first static electric shock sheet 28. The front and rear ends of the lower end of the dynamic electric shock rod 44 close to the second isolation component 24 are integrally connected with the second dynamic electric shock sheet 46. The two second dynamic electric shock sheets 46 are located at both ends of the second static electric shock sheet 32 ​​and are electrically connected to the second static electric shock sheet 32. By rotating the third connecting shaft 36 and the bearing fixing plate 34, the dynamic electric shock assembly 40 can rotate clockwise or counterclockwise, thereby controlling the contact and separation of the first dynamic electric shock piece 45 and the second dynamic electric shock piece 46 with the static electric shock piece, achieving fast and stable opening and closing operations and improving the system response speed.

[0050] Transmission mechanism: It is composed of a drive motor 7, a fan-shaped drive gear 8, a first rotating gear 9, a second rotating gear 10, a transmission belt 16, a second connecting shaft 17, a first bevel gear 18, a second bevel gear 47, a threaded rod 48, a threaded sleeve 49, an insulating lifting rod 50 and other structures. The drive motor 7 is installed in the middle of the front end of the equipment installation box 5. The fan-shaped drive gear 8 is installed along the output shaft end of the drive motor 7 inside the equipment installation box 5. The second rotating gear 10 is installed along one side of the fan-shaped drive gear 8 inside the equipment installation box 5. The second rotating gear 10 is intermittently meshed with the fan-shaped drive gear 8. The intermediate shaft of the second rotating gear 10 extends to the rear end of the equipment installation box 5 and is connected to the first transmission wheel 14. The second transmission wheel 15 is installed on the upper end of one side of the rear end of the equipment installation box 5. The second transmission wheel 15 is connected to the first transmission wheel 14 through a transmission belt 16. The intermediate shaft of the second transmission wheel 15 is set as the second connecting shaft 17, which passes through the equipment installation box 5 and extends to the front and rear ends respectively. The first bevel gears 18 are installed on the outside of the second connecting shaft 17 at equal distances from front to back. The rear end of the upper end of the first bevel gear 18 is meshed and connected with the second bevel gear 47. The upper end of the second bevel gear 47 is fixed with a threaded rod 48, and the external thread of the threaded rod 48 is connected to a threaded sleeve 49, and the upper end of the threaded sleeve 49 is fixed with an insulating lifting rod 50.

[0051] The drive motor 7 drives the sector drive gear 8 to rotate, and through the meshing between the gears and the transmission of the transmission belt 16, it drives the first bevel gear 18 and the second bevel gear 47 to rotate, and then drives the threaded rod 48 to rotate, and the threaded sleeve 49 realizes the lifting movement, controls the up and down movement of the limit assembly 51, realizes the precise control of the transmission mechanism, and ensures the accuracy and reliability of the opening and closing operations.

[0052] 4. Limiting components and lifting mechanism

[0053] Limiting assembly 51: It is arranged at the lower end between the two bearing fixing plates 34 on each isolating switch unit 20. The limiting assembly 51 includes a lifting plate 52. The insulating lifting rod 50 passes through the second insulator 30 and is connected to the lifting plate 52. Rotating grooves 54 are symmetrically opened on both sides of the lifting plate 52. The limiting block 55 is rotatably connected in the rotating groove 54. The limiting block 55 extends upward and is integrally connected to the limiting head 56. The upper end face of the limiting head 56 is a second inclined surface 58, and the lower end face of the limiting head 56 is a first inclined surface 57. The cross-section of the limiting head 56 forms a trapezoidal structure with the short side on the outside; a pressure spring 59 is installed between the two limiting heads 56 on each limiting assembly 51. The inner side surface of the rotating groove 54 on the lifting plate 52 is set as a limiting inclined surface 60. The two limiting inclined surfaces 60 are inclined inward and the two limiting inclined surfaces 60 are symmetrically arranged.

[0054] A rectangular limit cavity 43 is provided at the lower end of the interior of the third rotating block 41. The height and width of the rectangular limit cavity 43 match the size of the limit head 56. A rectangular groove 42 is provided on the lower end surface of the third rotating block 41. The rectangular groove 42 is connected to the rectangular limit cavity 43. The length of the rectangular groove 42 is greater than the sum of the lengths of the two limit heads 56. The trapezoidal structure of the limit head 56 facilitates cooperation with the rectangular groove 42 and the rectangular limit cavity 43 to achieve the limitation and unlocking of the dynamic electric shock component 40.

[0055] A vertical limiting sliding groove 35 is provided at the lower end of the inner end surface of the bearing fixing plate 34, and vertical limiting sliding blocks 53 are integrally connected to both ends of the lifting plate 52. The vertical limiting sliding blocks 53 slide along the vertical limiting sliding groove 35 to ensure the stable position of the dynamic electric shock component during the opening and closing process to prevent accidental rotation.

[0056] Lifting mechanism: It consists of a threaded rod 48, a threaded sleeve 49, and an insulating lifting rod 50. The lifting movement is achieved through the threaded connection, controlling the upper and lower positions of the limit assembly 51, achieving precise control of the limit assembly and ensuring smooth opening and closing operations.

[0057] 5. Linkage mechanism and drive mechanism

[0058] The linkage mechanism consists of a second linkage rod 37, a second rotating block 38, a third insulator 39, a first linkage rod 12, and a first connecting shaft 11. A second linkage rod 37 is provided outside the third connecting shaft 36 along the rear end of each set of bearing fixing plates 34. The second linkage rod 37 is fixed to the third connecting shaft 36. The other end of the second linkage rod 37 is rotatably connected to the second rotating block 38 via an axis. The lower end of the second rotating block 38 is fixed to the third insulator 39, and the lower end of the third insulator 39 is fixed to the first rotating block 13. The other end of the first rotating block 13 extends into the first linkage rod 12 and is rotatably connected to the first linkage rod 12 via an axis. The other end of the first linkage rod 12 is fixed to the first connecting shaft 11, which extends through and connects to the first linkage rods 12 on multiple disconnector units 20. The rotational connection between the third connecting shaft 36 and the bearing fixing plate 34 enables the dynamic electric shock assembly 40 to rotate clockwise or counterclockwise, achieving effective linkage between the dynamic electric shock assembly and the drive motor, thereby improving the efficiency of the opening and closing operations.

[0059] The drive mechanism consists of a drive motor 7, a sector drive gear 8, a first rotating gear 9, and a second rotating gear 10. The first rotating gear 9 is located inside the equipment mounting box 5, along the other side of the sector drive gear 8. The first rotating gear 9 intermittently meshes with the sector drive gear 8. A first connecting shaft 11 passes through the equipment mounting box 5 and is secured to the first rotating gear 9 via a keyway. The meshing and transmission between the gears enables the drive motor to precisely control the dynamic contact assembly and the limiter assembly, providing powerful driving force and precise transmission control, ensuring rapid and accurate opening and closing operations.

[0060] When the circuit breaker needs to be opened: the driving motor 7 drives the sector drive gear 8 to rotate counterclockwise. Since the tooth portion of the sector drive gear 8 is engaged with the second rotating gear 10 at this time and there is no meshing relationship with the first rotating gear 9, the second rotating gear 10 can be driven to rotate clockwise, and the first transmission wheel 14 rotates clockwise synchronously. The transmission belt 16 drives the second transmission wheel 15, the second connecting shaft 17 and the first bevel gear 18 to rotate clockwise, and the second bevel gear 47 drives the threaded rod 48 to rotate counterclockwise, and the threaded sleeve 49, the insulating lifting rod 50 and the limit assembly 51 are driven downward through the threaded connection relationship between the threaded rod 48 and the threaded sleeve 49. The first inclined surface 57 of the upper limit head 56 of the limit assembly 51 contacts the side of the rectangular groove 42, pressing each group of two limit blocks 55 to rotate inward, and the pressure spring 59 is compressed. As the fan-shaped drive gear 8 rotates, the limit assembly 51 moves downward until the limit head 56 moves downward and disengages from the third rotating block 41 on the dynamic electric shock assembly 40. The pressure spring 59 pushes the limit block 55 to reset, releasing the limit of the dynamic electric shock assembly 40 by the limit assembly 51.

[0061] The drive motor 7 drives the sector drive gear 8 to continue rotating. The sector drive gear 8 stops meshing with the second rotating gear 10 and instead meshes with the first rotating gear 9. The first rotating gear 9 rotates clockwise, driving the first connecting shaft 11 to rotate. The first linkage rod 12 rotates synchronously clockwise, pulling the third insulator 39 downward, driving the third connecting shaft 36 and the second linkage rod 37 to rotate clockwise. Due to the connection between the third rotating block 41 and the third connecting shaft 36 on the dynamic electric shock assembly 40, the dynamic electric shock assembly 40 is driven to rotate clockwise. As the second dynamic electric shock piece 46 rotates, it disengages from the outside of the first static electric shock piece 28 and the first conductive spring piece 29. As the sector drive gear 8 continues to rotate, the first dynamic electric shock piece 45 disengages from the outside of the second static electric shock piece 32 and the second conductive spring piece 33.

[0062] When the circuit breaker needs to be closed: the drive motor 7 drives the sector drive gear 8 to rotate, and the drive motor 7 drives the sector drive gear 8 to rotate counterclockwise to engage with the first rotating gear 9. The dynamic electric contact assembly 40 rotates in the opposite direction, and the first moving electric contact piece 45 contacts the second static electric contact piece 32 and the second conductive spring piece 33. As the dynamic electric contact assembly 40 continues to rotate, the second moving electric contact piece 46 contacts the first static electric contact piece 28 and the first conductive spring piece 29, so that the current passes normally.

[0063] The driving motor 7 drives the sector drive gear 8 to continue to rotate. The tooth portion of the sector drive gear 8 is engaged with the second rotating gear 10, and there is no meshing relationship with the first rotating gear 9. The limit assembly 51 moves upward through the intermediate linkage structure. The second inclined surface 58 on the limit head 56 contacts the side of the rectangular groove 42, pressing each group of two limit blocks 55 to rotate inward, and the pressure spring 59 is compressed. As the sector drive gear 8 rotates, the limit assembly 51 moves upward until the limit head 56 enters the rectangular limit cavity 43 of the third rotating block 41 on the dynamic electric shock assembly 40. The pressure spring 59 pushes the limit block 55 to reset, and the limit assembly 51 limits the dynamic electric shock assembly 40. The dynamic electric shock assembly 40 cannot be directly driven to rotate in this state, maintaining the conductive state between the first isolation assembly 23, the dynamic electric shock assembly 40 and the second isolation assembly 24.

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A fast disconnector for a DC distribution network, comprising a lower support frame (1), a longitudinal connecting frame (19) being fixed to the upper end of the lower support frame (1), and disconnector units (20) being mounted at equal distances from front to back on the upper end of the longitudinal connecting frame (19), characterized in that: The isolating switch unit (20) comprises a transverse connecting frame (21), and two supporting plates (22) are provided on the transverse connecting frame (21); A first isolation assembly (23) is provided at the upper end of the support plate (22) on one side. The first isolation assembly (23) includes a first insulator (25). A first contact piece (26) is installed at the upper end of the first insulator (25). The first contact piece (26) extends outward. A contact seat (27) is installed on the inner side of the upper end of the first contact piece (26). A first static contact piece (28) is installed at the upper end of the contact seat (27). A second isolation assembly (24) is provided at the upper end of the support plate (22) on the other side. The second isolation assembly (24) includes a second insulator (30). A second contact piece (31) is installed at the upper end of the second insulator (30). The second contact piece (31) extends outward. A second static contact piece (32) is installed on the inner side of the upper end of the second contact piece (31). A bearing fixing plate (34) is fixed to the upper end of the second insulator (30) along both ends of the second contact piece (31). A third connecting shaft (36) is commonly passed through the bearing fixing plates (34) on the plurality of isolating switch units (20). The third connecting shaft (36) is rotatably connected to the bearing fixing plate (34). A dynamic electric shock component (40) is provided between each group of two bearing fixing plates (34) along the outside of the third connecting shaft (36), and the dynamic electric shock component (40) includes a third rotating block (41), the third rotating block (41) is fixed to the third connecting shaft (36), and a dynamic electric shock rod (44) is fixed on one side of the third rotating block (41) close to the first isolation component (23), and the front and rear ends of the other end of the dynamic electric shock rod (44) are integrally connected to the first dynamic electric shock sheet (45), and the two first dynamic electric shock sheets (45) are located at both ends of the first static electric shock sheet (28) and are electrically connected to the first static electric shock sheet (28), and the front and rear ends of the lower end of the dynamic electric shock rod (44) close to the second isolation component (24) are integrally connected to the second dynamic electric shock sheet (46), and the two second dynamic electric shock sheets (46) are located at both ends of the second static electric shock sheet (32) and are electrically connected to the second static electric shock sheet (32); A second transmission wheel (15) is installed at the upper end of one side of the rear end of the equipment installation box (5), and the intermediate shaft of the second transmission wheel (15) is set as a second connecting shaft (17). The second connecting shaft (17) passes through the equipment installation box (5) and extends to the front and rear ends respectively. A first bevel gear (18) is installed on the outside of the second connecting shaft (17) at equal intervals from front to back. The rear end of the upper end of the first bevel gear (18) is meshedly connected with the second bevel gear (47). The upper end of the second bevel gear (47) is fixed with a threaded rod (48). The outer thread of the threaded rod (48) is connected to a threaded sleeve (49). The upper end of the threaded sleeve (49) is fixed with an insulating lifting rod (50); each of the insulating A limit assembly (51) is provided at the lower end between the two bearing fixing plates (34) on the opening unit (20), the limit assembly (51) comprising a lifting plate (52), the insulating lifting rod (50) passing through the second insulator (30) and connected to the lifting plate (52), the lifting plate (52) having rotation grooves (54) symmetrically provided on both sides thereof, the rotation grooves (54) being rotatably connected to the limit blocks (55), the limit blocks (55) extending upward and being integrally connected to the limit head (56), the upper end surface of the limit head (56) being a second inclined surface (58), the lower end surface of the limit head (56) being a first inclined surface (57), and the cross section of the limit head (56) forming a trapezoidal structure with the short side on the outside.

2. A fast disconnect switch for a DC distribution network according to claim 1, characterized in that: The lower support frame (1) includes a plurality of support columns (2), a connecting transverse plate (3) is fixed to the outside of the plurality of support columns (2), a support platform (4) is fixed to a side of the connecting transverse plate (3) close to the second isolation component (24), an equipment installation box (5) is installed at the upper end of the support platform (4), and an inspection port (6) is opened on the end face of the equipment installation box (5).

3. The fast disconnect switch for a DC distribution network according to claim 2, characterized in that: A driving motor (7) is installed in the middle of the front end of the equipment installation box (5), a fan-shaped driving gear (8) is installed inside the equipment installation box (5) along the output shaft end of the driving motor (7), a second rotating gear (10) is installed inside the equipment installation box (5) along one side of the fan-shaped driving gear (8), the second rotating gear (10) is intermittently meshed with the fan-shaped driving gear (8), an intermediate shaft of the second rotating gear (10) extends to the rear end of the equipment installation box (5) and is connected to the first transmission wheel (14), and the second transmission wheel (15) is connected to the first transmission wheel (14) through a transmission belt (16).

4. The fast disconnect switch for a DC distribution network according to claim 3, characterized in that: A pressure spring (59) is installed between the two limiting heads (56) on each limiting assembly (51), and the inner side surface of the rotating groove (54) on the lifting plate (52) is set as a limiting inclined surface (60). The two limiting inclined surfaces (60) are inclined inwardly and are symmetrically arranged.

5. The fast disconnect switch for a DC distribution network according to claim 4, characterized in that: A rectangular limiting cavity (43) is provided at the lower end of the interior of the third rotating block (41), and the height and width of the rectangular limiting cavity (43) match the size of the limiting head (56). A rectangular groove (42) is provided on the lower end surface of the third rotating block (41), and the rectangular groove (42) is connected to the rectangular limiting cavity (43). The length of the rectangular groove (42) is greater than the sum of the lengths of the two limiting heads (56).

6. The fast disconnect switch for a DC distribution network according to claim 5, characterized in that: A vertical limiting sliding groove (35) is provided at the lower end of the inner end surface of the bearing fixing plate (34), and vertical limiting sliding blocks (53) are integrally connected to both ends of the lifting plate (52), and the vertical limiting sliding blocks (53) slide along the vertical limiting sliding groove (35).

7. The fast disconnect switch for a DC distribution network according to claim 3, characterized in that: A second linkage rod (37) is provided outside the third connecting shaft (36) along the rear end of each group of the bearing fixing plates (34), the second linkage rod (37) is fixed to the third connecting shaft (36), the other end of the second linkage rod (37) is connected to the second rotating block (38) through an axis rotation, the lower end of the second rotating block (38) is fixed with a third insulator (39), the lower end of the third insulator (39) is fixed with a first rotating block (13), the other end of the first rotating block (13) extends into the first linkage rod (12) and is connected to the first linkage rod (12) through an axis rotation, the other end of the first linkage rod (12) is fixed with a first connecting shaft (11), the first connecting shaft (11) passes through and connects the first linkage rods (12) on the plurality of isolating switch units (20); A first rotating gear (9) is provided inside the equipment installation box (5) along the other side of the sector drive gear (8), and the first rotating gear (9) is intermittently meshed with the sector drive gear (8). The first connecting shaft (11) passes through the equipment installation box (5) and is fixed to the first rotating gear (9) via a keyway.

8. The fast disconnect switch for a DC distribution network according to claim 1, characterized in that: Both ends of the first static contact piece (28) are fixed with first conductive spring pieces (29), and both ends of the second static contact piece (32) are fixed with second conductive spring pieces (33).

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