Quick isolating switch for direct-current power distribution network

Abstract

The invention discloses a quick isolating switch for a direct-current power distribution network, relates to the related technical field of isolating switches, and aims to solve the problems that in the prior art, a movable contact piece is always electrified, and the movable contact piece is relatively large in overall size as a structure which is driven to rotate and conduct electricity; and if the isolating switch deviates from a normal position due to external force impact and the like in an opening state, the isolating switch contacts with other metal parts of the isolating switch, and short circuit may be caused. The first isolation assembly comprises a first insulator, the upper end of the first insulator is provided with a first contact piece, the inner side of the upper end of the first contact piece is provided with a contact seat, and the upper end of the contact seat is provided with a first static contact piece; the second isolation assembly comprises a second insulator, the upper end of the second insulator is provided with a second contact piece, and the inner side of the upper end of the second contact piece is provided with a second static contact piece. And a dynamic electric shock assembly is arranged between the two bearing fixing plates in each group along the outer part of the third connecting rotating shaft.

Description

Technical Field

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

[0002] With the transformation of the global energy structure and the continuous growth of electricity demand, DC distribution network has gradually become an important trend in the construction of future urban distribution networks due to its unique advantages. Compared with traditional AC distribution network, DC distribution network has the advantages of high power transmission efficiency, low line loss, strong control flexibility and easy access to distributed energy (such as solar energy, wind energy, etc.). Since the concept of DC distribution system was proposed, it has attracted widespread attention from scholars and power companies at home and abroad.

[0003] In the construction and operation of DC distribution networks, fault isolation technology is the key to ensuring their safe and reliable operation. Due to the low damping of the DC system, once a short-circuit fault occurs, the current will rise rapidly, seriously threatening the safety of the equipment. Especially for key equipment such as modular multilevel converters (MMCs), if the fault cannot be isolated in a timely and effective manner, it may cause components such as insulated gate bipolar transistors (IGBTs) in the submodules to burn out, causing significant economic losses or even personal injury. In addition, the DC short-circuit current does not have a natural zero-crossing point, and the arc-breaking principle of the AC circuit breaker cannot be directly used to remove the fault, which brings additional technical challenges to the fault isolation of the DC distribution network.

[0004] In view of the complexity and importance of fault isolation technology in DC distribution networks, it is imperative to develop efficient and reliable DC isolating switches. As a key device in DC distribution networks, the main function of DC isolating switches is to quickly cut off the fault line when a system fault occurs, prevent the fault from expanding, and ensure normal power supply in non-fault areas. Therefore, the design of fast isolating switches for DC distribution networks needs to have not only high-speed response capabilities, but also good insulation performance and dynamic stability conductivity to adapt to the high voltage and high current operating environment of the DC system.

[0005] For example, the Chinese authorized patent with announcement number CN 205388952 U (an isolating switch 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 at the lower right of the lifting ear. One end of the gas spring is hinged on the lifting ear, and the other end is hinged on the ear plate. The structure adopted by the utility model can make the isolating switch open and close accurately, without relying on the experience of the operator, and effectively solves the problem of equipment being energized due to the inadequate opening of the isolating switch and the accelerated aging of the equipment due to the inadequate closing of the isolating switch.

[0006] Although the above-mentioned prior art has good insulation performance and dynamically stable conductive performance, it only disconnects the current of the circuit formed by the moving contact plate and the static contact plate after the power is cut off by opening the switch. 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 and 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 mentioned in the above background technology is always energized. 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 and other reasons in the open state, and contacts with other metal parts of the disconnector, it may cause a short circuit.

[0008] To achieve the above object, 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 is fixed to the upper end of the lower support frame, and disconnector units are installed at equal distances from front to back on the upper end of the longitudinal connecting frame, and the disconnector units include a transverse connecting frame, and two support plates are arranged on the transverse connecting frame;

[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 at the upper end of the second insulator, the second contact piece extends outward, 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 at the upper end of the second insulator along both ends of the second contact piece, a third connecting shaft is commonly passed through the bearing fixing plates on the plurality of the isolating switch units, and the third connecting shaft is rotatably connected to the bearing fixing plate;

[0011] A dynamic electric shock component is arranged between each group of two bearing fixing plates along the outside of the third connecting rotating shaft, and the dynamic electric shock component includes a third rotating block, which is fixed to the third connecting rotating 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 the two 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.

[0012] Preferably, the lower support frame includes a plurality of support columns, a connecting cross plate is commonly 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, an 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 penetrates 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 arranged at the lower end between the two bearing fixing plates on each of the isolating switch units, the limit assembly includes a lifting plate, the insulating lifting rod passes through the second insulator and is connected to the lifting plate, rotation grooves are symmetrically opened on both sides inside the lifting plate, a limit block is rotatably connected in the rotation groove, the limit block extends upward and is integrally connected to a limit head, the upper end surface of the limit head is a second inclined surface, the lower end surface of the limit head is a 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 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 limit sliding along the vertical limiting sliding groove.

[0019] Preferably, a second linkage rod is arranged 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 through 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 through an axis, the other end of the first linkage rod is fixed to a first connecting shaft, and the first connecting shaft penetrates and connects to the first linkage rods on the plurality of the isolating switch units;

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

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

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

[0023] 1. In the invention, after the switch is opened, the second moving contact piece is separated from the first static contact piece and the outside of 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, and the dynamic contact component as a dynamic component is not connected with 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 problem that the current moving contact piece is always charged, and the moving 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 the invention, the first static contact plate and the second static contact plate are respectively equipped with conductive springs to ensure the formation of a stable conductive path during the contact process, reduce contact resistance, and improve current transmission efficiency.

[0025] 3. In the invention, when the gate needs to be opened, the driving motor drives the fan-shaped driving gear to rotate counterclockwise. Since the tooth portion of the fan-shaped driving gear is 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, and the first transmission wheel rotates clockwise synchronously. The transmission of the transmission belt drives the second transmission wheel, the second connecting shaft and the first bevel gear to rotate clockwise, and the second bevel gear drives the threaded rod to rotate counterclockwise. The threaded connection relationship 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, and the pressure spring is compressed. With the rotation of the fan-shaped driving gear, 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, and releases the limit assembly on the dynamic electric shock assembly. In the closed state, the limit assembly limits the dynamic electric shock assembly, and the dynamic electric shock assembly cannot be directly driven to rotate in this state, maintaining the conductive state between the first isolation assembly, the dynamic electric shock assembly and the second isolation assembly. After the limit is released, the dynamic electric shock assembly can be driven to rotate to achieve the opening operation, ensuring that the isolation switch operates smoothly during the opening and closing process, reducing failures caused by mechanical vibration or impact, and improving the stability and reliability of the system.

[0026] 4. In this invention, the second rotating gear is intermittently meshed with the fan-shaped driving gear, and the first rotating gear is intermittently meshed with the fan-shaped driving gear, so that the entire drive only needs to introduce one driving structure to avoid structural redundancy; and the two-part meshing 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 the integrity is strong. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 2 It is a schematic diagram of the overall structure of a fast isolating switch for a DC distribution network according to the present invention from a bottom-up perspective;

[0029] Figure 3 It is a front view of a fast isolating switch for a DC distribution network of the present invention;

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

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

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

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

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

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

[0036] Fig.10 It is 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] Fig.11 It is a structural schematic diagram of a limit assembly of a fast disconnect switch for a DC distribution network of the present invention;

[0038] Fig.12 It is a structural cross-sectional view at position BB of a fast isolating switch for a DC distribution network of the present invention;

[0039] Fig.13 The present invention is a schematic structural diagram of a device installation box driving structure for a fast disconnect switch for a DC power 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, fan-shaped 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. Moving contact rod; 45. First moving contact piece; 46. Second moving 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 described clearly and completely 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] The present embodiment provides 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 thereof, and a plurality of disconnector units 20 being equidistantly mounted on the longitudinal connecting frame 19. Each disconnector unit 20 comprises a transverse connecting frame 21, two supporting plates 22 being arranged on the transverse connecting frame 21, a first isolation assembly 23 being arranged at the upper end of the supporting plate 22 on one side, and a second isolation assembly 24 being arranged at the upper end of the supporting plate 22 on the other side.

[0044] The lower support frame 1 includes a plurality of support columns 2, and a connecting cross plate 3 is commonly fixed to the outside of the plurality of support columns 2. A supporting 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, and the first contact piece 26 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 installs the first static contact piece 28, and first conductive spring pieces 29 are fixed at both ends of the first static contact piece 28 to enhance the conductive performance.

[0047] The second isolation assembly 24: The structure is similar to the first isolation assembly 23, including a second insulator 30, a second contact piece 31 is installed on 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, and second conductive springs 33 are fixed at both ends of the second static contact piece 32; a bearing fixing plate 34 is fixed along both ends of the second contact piece 31 at the upper end of the second insulator 30, which is used to install a third connecting shaft 36, and the third connecting shaft 36 is rotatably connected to the bearing fixing plate 34 to realize the rotation of the dynamic electric shock assembly 40. It works in conjunction with the first isolation assembly to ensure the 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, a dynamic electric shock rod 44 is fixed to the side of the third rotating block 41 close to the first isolation component 23, 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 moving electric shock sheet 45 and the second moving electric shock sheet 46 with the static electric shock sheet, 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, and the second connecting shaft 17 penetrates the equipment installation box 5 and extends to the front and rear ends respectively. The first bevel gears 18 are installed equidistantly from front to back on the outside of the second connecting shaft 17, and the rear end of the upper end of the first bevel gear 18 is meshedly connected with the second bevel gear 47, and the upper end of the second bevel gear 47 is fixed with a threaded rod 48, and the outer thread of the threaded rod 48 is connected with a threaded sleeve 49, and the upper end of the threaded sleeve 49 is fixed with an insulating lifting rod 50.

[0051] The driving motor 7 drives the sector driving gear 8 to rotate, and through the meshing between the gears and the transmission of the transmission belt 16, 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] The limit assembly 51 is arranged at the lower end between the two bearing fixing plates 34 on each isolating switch unit 20. The limit 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. Rotation grooves 54 are symmetrically provided on both sides of the lifting plate 52. The limit blocks 55 are rotatably connected in the rotation grooves 54. The limit blocks 55 extend upward and are integrally connected to the limit heads 56. The upper end surface of the limit heads 56 is the second inclined surface 58, and the lower end surface of the limit heads 56 is the first inclined surface 57. The cross section of the limit heads 56 forms a trapezoidal structure with the short side on the outside. A pressure spring 59 is installed between the two limit heads 56 on each limit assembly 51. The inner side surface of the rotation groove 54 on the lifting plate 52 is set as a limit inclined surface 60. The two limit inclined surfaces 60 are inclined inwardly and the two limit 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, and 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, and 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 limiting 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 is composed of a threaded rod 48, a threaded sleeve 49 and an insulating lifting rod 50. The lifting movement is realized through threaded connection, the upper and lower positions of the limit assembly 51 are controlled, and the limit assembly is precisely controlled to ensure the smooth opening and closing operations.

[0057] 5. Linkage mechanism and driving mechanism

[0058] Linkage mechanism: It is composed 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 arranged outside the third connecting shaft 36 along the rear end of each group 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 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, and the first connecting shaft 11 penetrates and connects the first linkage rods 12 on multiple isolating switch units 20. Through the rotation connection between the third connecting shaft 36 and the bearing fixing plate 34, the clockwise or counterclockwise rotation of the dynamic electric shock assembly 40 is realized, and the effective linkage between the dynamic electric shock assembly and the drive motor is realized, thereby improving the efficiency of the opening and closing operation.

[0059] Driving mechanism: It is composed of a driving motor 7, a sector driving gear 8, a first rotating gear 9 and a second rotating gear 10; a first rotating gear 9 is arranged inside the equipment installation box 5 along the other side of the sector driving gear 8, and the first rotating gear 9 is intermittently meshed with the sector driving gear 8, and a first connecting shaft 11 passes through the equipment installation box 5 and is fixed with the first rotating gear 9 through a keyway. Through the meshing and transmission between the gears, the driving motor can achieve precise control of the dynamic electric shock assembly and the limit assembly, providing a strong driving force and precise transmission control, and ensuring the rapidity and accuracy of the opening and closing operations.

[0060] When it is necessary to open the gate: the driving motor 7 drives the fan-shaped driving gear 8 to rotate counterclockwise. Since the tooth portion of the fan-shaped driving gear 8 is meshed 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, and the second transmission wheel 15, the second connecting shaft 17 and the first bevel gear 18 are driven to rotate clockwise through the transmission of the transmission belt 16. 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 to move 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 driving 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, thereby releasing the limit assembly 51 from the dynamic electric shock assembly 40.

[0061] The driving motor 7 drives the sector driving gear 8 to continue to rotate, and the sector driving gear 8 stops meshing with the second rotating gear 10, but meshes with the first rotating gear 9. The first rotating gear 9 rotates clockwise, driving the first connecting shaft 11 to rotate, and the first linkage rod 12 rotates clockwise synchronously, pulling the third insulator 39 to move downward, driving the third connecting shaft 36 and the second linkage rod 37 to rotate clockwise. Due to the connection relationship between the third rotating block 41 on the dynamic electric shock component 40 and the third connecting shaft 36, the dynamic electric shock component 40 is driven to rotate clockwise. The second dynamic electric shock sheet 46 is separated from the outside of the first static electric shock sheet 28 and the first conductive spring sheet 29 as it rotates. As the sector driving gear 8 continues to rotate, the first dynamic electric shock sheet 45 is separated from the outside of the second static electric shock sheet 32 ​​and the second conductive spring sheet 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 and engage with the first rotating gear 9, and the dynamic electric shock assembly 40 rotates in the opposite direction, and the first moving electric shock piece 45 contacts the second static electric shock piece 32 and the second conductive spring piece 33, and as the dynamic electric shock assembly 40 continues to rotate, the second moving electric shock piece 46 contacts the first static electric shock piece 28 and the first conductive spring piece 29, so that the current passes normally.

[0063] The driving motor 7 drives the fan-shaped driving gear 8 to continue to rotate. The tooth portion of the fan-shaped driving gear 8 is meshed 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 fan-shaped driving 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, and the pressure spring 59 pushes the limit block 55 to reset. 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 invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered 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 installed 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 arranged 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) comprises 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), and 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) comprises 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 at 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), and the third connecting shaft (36) is rotatably connected to the bearing fixing plate (34); A dynamic electric shock component (40) is arranged between each group of two bearing fixing plates (34) along the outside of the third connecting rotating shaft (36), and the dynamic electric shock component (40) comprises a third rotating block (41), the third rotating block (41) is fixed to the third connecting rotating shaft (36), a dynamic electric shock rod (44) is fixed to a side of the third rotating block (41) close to the first isolation component (23), the front and rear ends of the other end of the dynamic electric shock rod (44) are integrally connected to a first dynamic electric shock sheet (45), the two first dynamic electric shock sheets (45) are located at the two 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 to a second dynamic electric shock sheet (46), the two second dynamic electric shock sheets (46) are located at the two ends of the second static electric shock sheet (32) and are electrically connected to the second static electric shock sheet (32).

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

3. A 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 a first transmission wheel (14); a second transmission wheel (15) is installed at 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).

4. A fast disconnect switch for a DC distribution network according to claim 3, characterized in that: The intermediate shaft of the second transmission wheel (15) is set as a second connecting shaft (17), and the second connecting shaft (17) passes through the equipment installation box (5) and extends to the front and rear ends respectively. The 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), and the upper end of the second bevel gear (47) is fixed with a threaded rod (48), and the outer thread of the threaded rod (48) is connected with a threaded sleeve (49), and the upper end of the threaded sleeve (49) is fixed with an insulating lifting rod (50).

5. A fast disconnect switch for a DC distribution network according to claim 4, characterized in that: A limit assembly (51) is arranged at the lower end between the two bearing fixing plates (34) on each of the isolating switch units (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 arranged on both sides thereof, the rotation grooves (54) being rotationally connected to a limit block (55), the limit block (55) extending upward and integrally connected to a 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), the cross section of the limit head (56) forming a trapezoidal structure with the short side on the outside.

6. A fast disconnect switch for a DC distribution network according to claim 5, characterized in that: A pressure spring (59) is installed between the two limit heads (56) on each limit assembly (51); the inner side surface of the rotating groove (54) on the lifting plate (52) is arranged as a limit inclined surface (60); the two limit inclined surfaces (60) are inclined inwardly and are symmetrically arranged.

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

8. 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) are limitedly slidable along the vertical limiting sliding groove (35).

9. The fast disconnect switch for a DC distribution network according to claim 3, characterized in that: A second linkage rod (37) is arranged 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 inside the second linkage rod (37) is rotatably connected to a second rotating block (38) via an axis, a third insulator (39) is fixed to the lower end of the second rotating block (38), a first rotating block (13) is fixed to the lower end of the third insulator (39), 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 a first connecting shaft (11), the first connecting shaft (11) penetrates and connects to the first linkage rods (12) on a plurality of the isolating switch units (20); A first rotating gear (9) is arranged inside the equipment installation box (5) along the other side of the fan-shaped driving gear (8), and the first rotating gear (9) is intermittently meshed with the fan-shaped driving gear (8). The first connecting shaft (11) passes through the equipment installation box (5) and is fixed to the first rotating gear (9) through a keyway.

10. 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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