A double-break isolating switch

Abstract

The present case provides a double-break disconnector, in which the driving device drives the transmission rod and the active shaft of the transmission device to rotate synchronously, and then the first crank arm of the active shaft drives the first clamping fork device to drive the first moving contact to slide horizontally in the cavity of the moving contact seat of the first guide seat. At the same time, the second crank arm of the active shaft drives the connecting plate to move, driving the second clamping fork device to drive the second moving contact to slide vertically in the cavity of the moving contact seat of the second guide seat, and the driving device stops rotating, thereby driving the double-break disconnector unit device to realize the synchronous contact or synchronous separation of the first moving contact and the second moving contact with the first static contact device and the second static contact device respectively, so that the disconnector meets the double-break closing or opening position function. Compared with the prior art, it has the advantages of simple parts processing, convenient assembly and debugging, fast opening and closing response speed, and stable and reliable transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage AC and DC power transmission and transformation switches, and in particular relates to a double-break isolating switch. Background Art

[0002] With the continuous development of the national economy and power technology, the system has higher and higher requirements for power supply continuity and reliability. Large-scale gas-insulated metal-enclosed switchgear (GIS) power stations are restricted by factors such as infrastructure, operation and maintenance, and generally need to be built in phases. In the first phase, the equipment has an expansion interface reserved, and an isolation switchgear is set between the standby interval and the operating busbar.

[0003] However, there is only one isolating break in the isolating switchgear between the expansion bay and the operating busbar. When the bays are connected and installed, in order to avoid discharge failures at the isolating break and cause personal injury, the operating busbar needs to be powered off. At the same time, when conducting AC withstand voltage tests after bay expansion and maintenance, if the test voltage cannot maintain the same frequency and phase as the operating voltage, there will be a dangerous condition where the test voltage and the operating voltage amplitude are reversely superimposed on the isolating break. In order to avoid the breakdown of the isolating break and endanger the operating equipment, the current effective measure is to power off the operating busbar. This operation makes it extremely difficult for the operating unit to coordinate the power outage, and it is impossible to guarantee the technical requirements of important users for the continuity of power supply to the power system.

[0004] At present, users have clearly put forward the requirement that a double-break disconnector should be installed in the spare interval, and related research has become a hot topic in the industry. The double-break structure of the disconnector in the prior art adopts the transmission form of gear racks, and the moving contact needs to be assembled with racks inside and outside respectively. There are many types of parts, and the processing and subassembly process is relatively complicated. When performing the opening and closing operation, the driving gear needs to rotate multiple times to realize the movement of the moving contact. The response speed is slow, which is not conducive to the rapid opening and closing of the switch.

[0005] Therefore, how to overcome the above technical defects is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a double-break disconnector with a simple structure, fast opening and closing response speed and stable and reliable transmission.

[0007] In order to solve the above technical problems, the present invention provides a double-break disconnector, comprising a housing, a double-break disconnector unit device and a grounding unit device respectively arranged inside the housing, and a driving device arranged outside the housing;

[0008] The double-break isolation unit device comprises a first disc insulator, a second disc insulator, a first static contact device, a second static contact device, a moving contact seat, a first guide seat, a second guide seat, a first moving contact, a second moving contact and a supporting unit, wherein the moving contact seat is placed in a hollow cavity of the housing, the first guide seat and the second guide seat are arranged in an inner cavity of the moving contact seat, the first moving contact and the second moving contact are slidably arranged on the first guide seat and the second guide seat respectively, and the supporting unit supports the moving contact seat;

[0009] The double-break isolation unit device also includes a transmission device for realizing a double-break structure and opening or closing the switch at the same time, the transmission device includes a transmission rod arranged outside the moving contact seat, and an active shaft and a connecting plate arranged inside the moving contact seat, the active shaft is rotatably arranged on the moving contact seat, a first crank arm and a second crank arm are arranged on the active shaft at intervals, the first crank arm is hinged to the first moving contact, the second crank arm is hinged to the connecting plate, the connecting plate is hinged to the second moving contact, and the transmission rod is used to connect the drive device and the active shaft;

[0010] The moving paths of the first moving contact and the second moving contact are perpendicular to each other, and are staggered in a plane perpendicular to the moving direction. The central axes of the first static contact device and the second static contact device arranged opposite to each other are respectively aligned with the central axes of the first moving contact and the second moving contact. The first moving contact and the first static contact device are in contact and conduction with each other, and the second moving contact and the second static contact device are in contact and conduction with each other, and the two moving contacts and the two static contacts form a vertical double-break structure.

[0011] The housing is provided with a first flange interface for fixing the second disc insulator and the second static contact device and a second flange interface for fixing the support unit at the upper and lower ends in the vertical direction, a third flange interface for fixing the first disc insulator and the first static contact device and a fourth flange interface for fixing the grounding unit device at the left and right ends in the horizontal direction, and a fifth flange interface for fixing the shaft seal cover plate at the front end in the horizontal direction;

[0012] The grounding unit device is used to realize the grounding of the double-break disconnector;

[0013] The driving device is arranged on the outside of the shell, and is used to drive the transmission device, thereby driving the double-break isolation unit device to realize the synchronous opening and closing actions of the first moving contact and the second moving contact, so that the double-break isolation switch meets the double-break closing or opening position function.

[0014] Optionally, in the above-mentioned double-break disconnector, the support unit includes an insulating support for fixing the moving contact seat, and a support shield for connecting the second flange interface, so as to achieve the installation and fixation of the moving contact seat and its insulation function with the shell.

[0015] Optionally, in the above-mentioned double-break isolating switch, the double-break isolating unit device further includes a first shielding seat and a second shielding seat arranged on both sides of a connection between the transmission rod and the moving contact seat.

[0016] Optionally, in the above double-break disconnector, both the first shielding seat and the second shielding seat are bowl-shaped structures with inner holes, and the two are coaxially symmetrically buckled on both sides of the moving contact seat.

[0017] Optionally, in the above-mentioned double-break disconnector, both ends of the active rotating shaft are fixed to the first shielding seat and the second shielding seat through rolling bearings.

[0018] Optionally, in the above-mentioned double-break disconnector, the first moving contact and the second moving contact are respectively connected with a first fork clamping device and a second fork clamping device, the first crank arm and the first fork clamping device are connected by a sliding shaft pin, the second crank arm and the connecting plate are hinged by a pin shaft, and the connecting plate and the second fork clamping device are hinged by a pin shaft.

[0019] Optionally, in the above-mentioned double-break disconnector, a long hole structure is provided on the first clamping fork device, which is used to be connected to the first crank arm through the slidable shaft pin.

[0020] Optionally, in the above-mentioned double-break disconnector, both side ends of the active rotating shaft are configured as outer cylindrical shafts with inner hexagonal holes formed thereon, and the ends of the transmission rod are provided with outer hexagonal structures for cooperating with the inner hexagonal holes of the active rotating shaft.

[0021] Optionally, in the above-mentioned double-break disconnector, the transmission device also includes a limit device arranged outside the shell, and the limit device is arranged between the drive device and the shaft seal cover plate to limit the opening and closing rotation angle.

[0022] Optionally, in the above-mentioned double-break disconnector, the number of the double-break disconnectors is three, the transmission rods of the three double-break disconnector unit devices are connected end to end and synchronous opening and closing operations are achieved through one driving device.

[0023] The present invention provides a double-break isolating switch, which has the following beneficial effects:

[0024] The driving device drives the transmission rod and the active shaft of the transmission device to rotate synchronously, and then the first crank arm of the active shaft drives the first clamping fork device to drive the first moving contact to slide horizontally in the cavity of the moving contact seat in the first guide seat. At the same time, the second crank arm of the active shaft drives the connecting plate to move, driving the second clamping fork device to drive the second moving contact to slide vertically in the cavity of the moving contact seat in the second guide seat, and the driving device stops rotating, thereby driving the double-break isolation unit device to realize the synchronous contact or synchronous separation of the first moving contact and the second moving contact with the first static contact device and the second static contact device respectively, so that the isolating switch meets the double-break closing or opening position function.

[0025] The transmission device mainly includes the active shaft and the connecting plate, with a small number of parts and components, and simple processing and assembly processes. Compared with the gear rack transmission form, the connecting rod transmission structure does not require the main shaft to rotate multiple times, and less than 1 / 4 turn can meet the moving stroke requirements of the moving contact. Under the condition that the rotation speed of the active shaft's crank arm is the same, the moving contact can achieve a faster moving speed and improve the response speed of the opening and closing.

[0026] In addition, the guide movement paths of the first moving contact and the second moving contact are perpendicular to each other, and are staggered in a plane perpendicular to the moving direction. This allows the moving guide paths of the two moving contacts to be in two directions, reducing the axial design length of the contact seat. The two moving contacts are staggered in a staggered design, which can effectively utilize the design space of the inner cavity structure of the contact seat, ensuring that there will be no interference when opening and closing the switch. At the same time, it also allows the moving contacts to reduce the overall size of the contact seat as much as possible while meeting the larger opening distance and moving stroke, thereby realizing the miniaturization and integrated layout design of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a transmission system of a double-break disconnector provided in an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of a double-break disconnector provided by an embodiment of the present invention, in which the moving contact is in an open state;

[0030] Figure 3 A schematic structural diagram of a moving contact of a double-break disconnector in a closed state provided by an embodiment of the present invention;

[0031] Figure 4A schematic diagram of the internal structure of a double-break disconnector in a specific embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the structure of a double-break disconnector in a specific embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the internal structure of a double-break disconnector in another specific embodiment provided by the present invention;

[0034] Figure 7 A schematic structural diagram of a double-break disconnector in another specific embodiment provided by the present invention.

[0035] In the above picture:

[0036] 1-housing; 2-second disc insulator; 3-second static contact device; 4-second guide seat; 5-second moving contact; 6-second clamping fork device; 7-connecting plate; 8-grounding unit device; 801-first grounding unit device; 802-second grounding unit device; 803-third grounding unit device; 9-active shaft; 10-moving contact seat; 11-insulating support; 12-support shield; 13-support unit; 131-first support unit; 132-second support unit; 133-third support unit; 14-first clamping fork device; 15-first A moving contact; 16-a first guide seat; 17-a first static contact device; 18-a first disc insulator; 19-a first shielding seat; 20-a second shielding seat; 21-a transmission device; 211-a first transmission rod; 212-a second transmission rod; 213-a third transmission rod; 22-a shaft seal cover; 23-a limiting device; 24-a housing cover; 25-a driving device; 26-a double-break isolating unit device; 261-a first group of double-break isolating unit devices; 262-a second group of double-break isolating unit devices; 263-a third group of double-break isolating unit devices. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, horizontal, vertical, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present invention, the meaning of "plurality" is more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0041] The core of the present invention is to provide a double-break disconnector with a simple structure, fast opening and closing response speed, and stable and reliable transmission.

[0042] In order to enable those skilled in the art to better understand the technical solution provided by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] It should be noted that gas-insulated metal-enclosed switchgear (GIS for short) is an organic combination of circuit breakers, disconnectors, grounding switches, transformers, lightning arresters, busbars, bushings, cable terminals, etc., which is enclosed in a metal grounded shell filled with insulating gas and is a combined electrical equipment that controls the opening and closing of the system and provides protection.

[0044] The isolating switch (DS for short) is an extremely important safety device in the system. It is mainly used to safely isolate the power-off equipment and lines from the operating system to ensure the safety of maintenance personnel and power-off equipment. Its function is to have a clear isolation break, carry load current and short-circuit fault current, and have the ability to cut in busbar conversion and line small capacitive current.

[0045] The present invention provides a double-break disconnector, and in particular relates to a double-break disconnector suitable for non-stop expansion, maintenance and testing of a busbar, comprising at least: a shell 1, a driving device 25 arranged on the outside of the shell 1, and a double-break disconnector unit device 26 and a grounding unit device 8 respectively arranged on the inside of the shell 1.

[0046] The double-break isolation unit device 26 includes a first disc insulator 18, a second disc insulator 2, a first static contact device 17, a second static contact device 3, a moving contact seat 10, a first guide seat 16, a second guide seat 4, a first moving contact 15, a second moving contact 5 and a support unit 13. The moving contact seat 10 is placed in the hollow cavity of the housing 1, the first guide seat 16 and the second guide seat 4 are arranged in the inner cavity of the moving contact seat 10, the first moving contact 15 and the second moving contact 5 are slidably arranged on the first guide seat 16 and the second guide seat 4 respectively, and the support unit 13 supports the moving contact seat 10. It should be noted that the moving contact seat 10 is a casting with an inner cavity, and the first guide seat 16 and the second guide seat 4 with guiding and conductive contact functions are fixedly connected inside, and the first moving contact 15 and the second moving contact 5 that can be guided and slid are correspondingly equipped.

[0047] The double-break isolation unit device 26 also includes a transmission device 21 for realizing a double-break structure and opening or closing the switch at the same time. The transmission device 21 includes a limit device 23 arranged on the outside of the shell 1, a transmission rod arranged on the outside of the moving contact seat 10, and an active rotating shaft 9 and a connecting plate 7 arranged inside the moving contact seat 10. The active rotating shaft 9 is rotatably arranged on the moving contact seat 10. A first crank arm and a second crank arm are arranged on the active rotating shaft 9 at intervals. The first crank arm is hinged to the first moving contact 15, the second crank arm is hinged to the connecting plate 7, the connecting plate 7 is hinged to the second moving contact 5, and the transmission rod is used to connect the driving device 25 and the active rotating shaft 9.

[0048] Among them, the moving paths of the first moving contact 15 and the second moving contact 5 are perpendicular to each other, and are designed to be staggered at intervals on a plane perpendicular to the moving direction. The central axes of the first static contact device 17 and the second static contact device 3 arranged opposite to each other are respectively aligned with the central axes of the first moving contact 15 and the second moving contact 5. The first moving contact 15 and the first static contact device 17 are in corresponding contact and conduction, and the second moving contact 5 and the second static contact device 3 are in corresponding contact and conduction. The two moving contacts and the two static contacts form a vertical double-break structure.

[0049] The housing 1 is provided with a first flange interface and a second flange interface at the upper and lower ends in the vertical direction, respectively. The first flange interface is used to fix the second disc insulator 2 and the second static contact device 3, and the second flange interface is used to fix the support unit 13. The third flange interface and the fourth flange interface are provided at the left and right ends in the horizontal direction, respectively. The third flange interface is used to fix the first disc insulator 18 and the first static contact device 17, and the fourth flange interface is used to fix the grounding unit device 8. The fifth flange interface is provided at the front end in the horizontal direction for fixing the shaft seal cover plate 22. The sixth flange interface is provided at the rear end in the horizontal direction for fixing the housing cover plate 24 used for sealing the interface.

[0050] The grounding unit device 8 is used to realize the grounding of the double-break disconnector. It has an independent contact transmission system, which is electrically interlocked with the existing disconnector to realize the conductive grounding function of the moving contact seat 10 when the switch is opened.

[0051] The driving device 25 is arranged outside the housing 1, and is used to drive the transmission device 21, thereby driving the double-break isolating unit device 26 to realize the synchronous opening and closing action of the first moving contact 15 and the second moving contact 5, so that the double-break isolating switch meets the double-break closing or opening position function. Specifically, the driving device 25 can be a motor operating mechanism or an electric spring operating mechanism, which can meet the slow opening and closing operation of the isolating switch equipment, and can also achieve the fast opening and closing operation requirements, and has many application conditions.

[0052] It should be noted that the guide movement paths of the first moving contact 15 and the second moving contact 5 are perpendicular to each other, and are designed to be staggered at intervals on a plane perpendicular to the moving direction. This allows the moving guide paths of the two moving contacts to be in two directions, reducing the axial design length of the contact seat; the two moving contacts are designed to be staggered at intervals, which can effectively utilize the design space of the circular inner cavity structure of the contact seat, ensuring that there will be no interference when opening and closing the switch, and at the same time, the moving contacts can reduce the overall size of the contact seat as much as possible while meeting the larger opening distance and moving stroke, thereby realizing the miniaturization and integrated layout design of the equipment.

[0053] The transmission device 21 mainly includes an active rotating shaft 9 and a connecting plate 7, with a small number of parts and components, and simple processing and assembly processes. Compared with the transmission form of gear racks, the connecting rod transmission structure does not need to rotate the main shaft multiple times, and less than 1 / 4 turn can meet the needs of the moving stroke of the moving contact. Under the condition that the rotation speed of the crank arm of the active rotating shaft 9 is the same, the moving contact can obtain a faster moving speed and improve the response speed of the opening and closing. In addition, by reasonably setting the length of the two axially spaced crank arms on the active rotating shaft 9, different strokes of the first moving contact 15 and the second moving contact 5 of the disconnector can be achieved to meet the functional requirements of equipment of different voltage levels.

[0054] The double-break isolating switch provided by the present invention is as follows: Figure 2As shown, during the process from closing to opening, the driving device 25 rotates clockwise, driving the transmission rod of the transmission device 21 and the active shaft 9 to rotate synchronously, and then the first crank arm of the active shaft 9 drives the first clamping device 14 through the sliding shaft pin, driving the first moving contact 15 to slide horizontally to the right in the first guide seat 16 to the cavity of the moving contact seat 10. At the same time, the second crank arm of the active shaft 9 drives the connecting plate 7 to move through the shaft pin, driving the second clamping device 6 to drive the second moving contact 5 to slide vertically downward in the second guide seat 4 to the cavity of the moving contact seat 10, and the driving device 25 stops rotating, realizing the synchronous separation of the first moving contact 15 and the second moving contact 5 from the first static contact device 17 and the second static contact device 3 respectively, meeting the requirements of the double-break isolation function of the disconnector. The closing operation of the grounding unit system makes the conductive rod and the moving contact seat 10 reliably contact, realizing the reliable grounding of the moving contact seat 10 and the conductive system.

[0055] like Figure 3 As shown, during the process of the double-break disconnector switching from opening to closing, the grounding unit system separates the conductive rod from the moving contact seat 10, and then the driving device 25 rotates counterclockwise, driving the transmission rod of the transmission device 21 and the active rotating shaft 9 to rotate synchronously, and then the active rotating shaft 9 drives the first moving contact 15 to slide horizontally to the left, and drives the second moving contact 5 to slide vertically upward, and at the same time realizes the synchronous closing of the first moving contact 15, the second moving contact 5 and the first static contact device 17, the second static contact device 3, so as to meet the conductive and current-carrying function requirements of the disconnector.

[0056] Through the above settings, the key technical problems of the existing double-break disconnector for high-voltage switchgear, such as many transmission system parts, complex assembly and debugging process, large mechanical operation load, slow opening and closing speed response, and weak adaptability to equipment current capacity and voltage level expansion, can be effectively solved. In the opening and closing process, it has the advantages of compact structure, few parts, simple assembly and debugging process, strong current performance, fast opening and closing response speed, stable and reliable transmission, and wide scalability.

[0057] In a specific embodiment, the support unit 13 includes an insulating support 11 for fixing the moving contact seat 10 and a supporting shield 12 for connecting the flange of the housing 1, so as to realize the installation and fixation of the moving contact seat 10 of the disconnector and the insulation function between the high potential and the ground potential of the housing 1. Specifically, the insulating support 11 is an epoxy resin insulating platform structure, which is used to support the moving contact seat 10 device and realize the potential insulation between the moving contact seat 10 device and the housing 1.

[0058] Furthermore, a first guide seat 16 and a second guide seat 4 are designed inside the moving contact seat 10. The centers of the first guide seat 16 and the second guide seat 4 are both provided with through holes, and the inner walls are provided with guide rings and electrical connection contacts. Connecting flanges are provided on both sides of each guide seat for fixing with the moving contact seat 10, so as to realize the dual functions of guiding and conductive contact of the first moving contact 15 and the second moving contact 5. The guide seat and the moving contact seat 10 adopt a split design scheme. Without changing the structural dimensions, different conductivity materials (aluminum or copper, etc.) are used to meet the different current carrying capacity requirements of the equipment, and the capacity expansion is strong. The conductive circuit is conducted from the moving contact to the guide seat and the moving contact seat 10, making full use of the advantages of the external shielding heat dissipation of the moving contact seat 10 and the large internal heat dissipation space, and the structure has strong current carrying performance.

[0059] The first moving contact 15 and the second moving contact 5 can be driven by the active shaft 9 under the guidance of the moving contact seat 10 to achieve synchronous contact and synchronous separation with the first static contact device 17 and the second static contact device 3, so that the disconnector can meet the double-break closing or opening position function.

[0060] In a specific embodiment, the double-break isolation unit device 26 also includes a first shielding seat 19 and a second shielding seat 20 arranged on both sides of the connection between the transmission rod and the dynamic contact seat 10. Preferably, the first shielding seat 19 and the second shielding seat 20 are both bowl-shaped structures with inner holes, and the two are coaxially symmetrically buckled on both sides of the dynamic contact seat 10. The connection on both sides is shielded by the bowl-shaped outer structure of the first shielding seat 19 and the second shielding seat 20, which can improve the electric field distribution on the outer surface. The two shielding seats are coaxially symmetrically buckled and arranged on both sides of the dynamic contact seat 10. The shielding seat adopts an integrated design, which not only meets the requirements of the electric field distribution on the outer surface but also realizes the central rotation support function.

[0061] In order to improve the smoothness of rotation, both ends of the active shaft 9 are fixed to the first shielding seat 19 and the second shielding seat 20 through rolling bearings.

[0062] In a specific embodiment, the first moving contact 15 and the second moving contact 5 are respectively connected to the first clamping fork device 14 and the second clamping fork device 6, the first crank arm and the first clamping fork device 14 are connected by a sliding shaft pin, the second crank arm and the connecting plate 7 are hinged by a pin, and the connecting plate 7 and the second clamping fork device 6 are hinged by a pin.

[0063] The first clamping fork device 14 on the first moving contact 15 is set as a long hole structure, which is used to connect with the first crank arm through a slidable shaft pin. The second clamping fork device 6 on the second moving contact 5 is set as a round hole structure. The first crank arm of the active rotating shaft 9 is connected to the first clamping fork device 14 by a slidable shaft pin, and retaining rings are provided in the slots at both ends of the shaft pin. The second crank arm of the active rotating shaft 9 is hinged with the connecting plate 7 by a pin hole shaft, and retaining rings are provided in the slots at both ends of the shaft pin. The connecting plate 7 is hinged with the second clamping fork device 6 by a pin hole shaft, and retaining rings are provided in the slots at both ends of the shaft pin.

[0064] The first moving contact 15 and the second moving contact 5 are hingedly connected and driven by a clamping fork device. Compared with the rack transmission scheme, such a setting can effectively reduce the length of the moving contact, reduce the material cost and weight, and reduce the transmission load operation work. During the opening and closing operation, the first clamping fork device 14 at the end of the first moving contact 15 is connected by an axle pin with a long hole structure, which can effectively solve the sliding lateral force problem of the first moving contact 15 and the contact seat guide during the driving process of the active shaft 9. At the same time, the lateral force of the connecting plate 7 on the end of the second moving contact 5 is extremely small, which meets the ideal transmission efficiency and stable conductive contact technical requirements of the moving contact. The connecting plate 7 has a small design swing angle in the vertical sliding direction with the second moving contact 5 when the opening and closing operation is hinged.

[0065] In a specific embodiment, both ends of the active shaft 9 are designed as an outer cylindrical shaft and an inner hexagonal hole structure, and two arm structures are axially spaced apart on the active shaft 9 and the angle between the two can be close to 90°. Metal inserts are provided at both ends of the transmission rod, and the inserts are outer hexagonal structures, which are directly matched and docked with the inner hexagonal end holes of the active shaft 9 supported in the moving contact seat 10. This assembly structure facilitates accurate positioning of each phase opening and closing position, ensuring synchronization of the three-phase installation.

[0066] Furthermore, the transmission device 21 also includes a limit device 23 disposed outside the housing 1, and the limit device 23 is disposed between the drive device 25 and the shaft seal cover plate 22, and is used to limit the opening and closing rotation angle. The limit device 23 can ensure that the contact opening and closing is over-positioned due to mechanical or human malfunction, and the installation process is simple and the structure is safe and reliable.

[0067] In a first specific embodiment, Figure 4 and Figure 5 As shown, the number of double-break disconnectors is one, that is, a single-phase structure, which specifically includes a set of double-break disconnect unit devices 26 and their transmission devices 21 and a set of grounding unit systems.

[0068] In another specific embodiment, the difference from the previous embodiment is that, Figure 6 and Figure 7As shown, there are three double-break disconnectors, i.e., a three-phase common box structure, which mainly includes a three-phase common box housing 1 and three identical sets of first double-break isolation unit devices 26, second double-break isolation unit devices 26, third double-break isolation unit devices 26 and three identical sets of first grounding unit devices 801, second grounding unit devices 802, and third grounding unit devices 803. The support unit 13 includes a first support unit 131, a second support unit 132, and a third support unit 133. The transmission device 21 includes a first transmission rod 211, a second transmission rod 212 and a third transmission rod 213, which is similar to the transmission rod structure of Example 1. The second transmission rod 212 connects the first double-break isolation unit device 261 and the second double-break isolation unit device 262, and the third transmission rod 213 connects the second double-break isolation unit device 262 and the third double-break isolation unit device 263. The driving device 25 drives the first transmission rod 211, the second transmission rod 212 and the third transmission rod 213 to realize the synchronous opening and closing operations of the first double-break isolation unit device 261, the second double-break isolation unit device 262 and the third double-break isolation unit device 263.

[0069] Compared with existing technical solutions such as rack transmission, it can meet single-phase or three-phase mechanical linkage operation, and can meet fast and slow operation. It solves the technical problems of the current solutions such as many transmission system components, high cost, complex assembly and debugging process, large mechanical operation load power, slow opening and closing speed response, and poor adaptability to the expansion of equipment current capacity and voltage level. It can achieve the key functional requirements of double-break disconnectors for non-stop expansion, maintenance and testing of high-voltage switchgear.

[0070] In summary, the double-break disconnector provided in this case has the following advantages:

[0071] 1. Compared with the prior art, the present invention adopts a connecting rod transmission device 21, and a set of double-break isolation unit devices 26 has only two main transmission components, namely, an active rotating shaft 9 and a connecting plate 7, in a moving contact seat 10, and the articulation method is a shaft pin connection, with a small number of parts, and the processing and assembly process is very simple, safe and reliable.

[0072] 2. Compared with the existing technical solutions, the connecting rod transmission of the present invention is less than 1 / 4 turn to meet the moving stroke requirement of the moving contact, and there is no need to rotate the main shaft multiple times, which can enable the moving contact to obtain a faster response speed. By using different driving devices 25, two types of technical requirements, slow action and fast action, can be met.

[0073] 3. Compared with the existing technical solutions, the first moving contact 15 and the second moving contact 5 are articulated and connected by a clamping fork device, which can effectively reduce the length of the moving contact, reduce material cost and weight, and reduce the transmission load operation work. In addition, without changing the driving mechanism and transmission ratio, the requirements of the disconnector for the break and stroke of different voltage levels can be met by simply adjusting the arm length and axis position of the active shaft 9, which has strong expandability.

[0074] 4. The first clamping fork device 14 at the end of the first moving contact 15 is connected by an axle pin with a long hole structure, which can effectively solve the sliding lateral force problem of the first moving contact 15 and the guide member of the contact seat during the driving process of the active rotating shaft 9. At the same time, the lateral force of the connecting plate 7 on the end of the second moving contact 5 is extremely small, which meets the ideal transmission efficiency and stable conductive contact technical requirements of the moving contact.

[0075] 5. Compared with the existing technical solutions, the transmission rod and the active rotating shaft 9 are designed as a hexagonal assembly structure, which is convenient for accurate positioning of the opening and closing positions of each phase and ensures the synchronization of the three-phase installation. The limit device 23 ensures that the contact opening and closing is over-positioned due to mechanical or human error. The installation process is simple and the structure is safe and reliable.

[0076] 6. Compared with the existing technical solutions, the guide seat and the moving contact seat 10 adopt a split design. Without changing the structural dimensions, different conductivity materials (aluminum or copper, etc.) are used to meet the different current flow capacity requirements of the equipment, and the capacity expansion is strong. The conductive circuit is transmitted from the moving contact to the guide seat and the moving contact seat 10, making full use of the advantages of the external shielding heat dissipation of the moving contact seat 10 and the large internal heat dissipation space, and the structure has strong current flow performance.

[0077] 7. The two moving contacts are designed with an interval staggered design, which can effectively utilize the design space of the circular inner cavity structure of the contact seat to ensure that there is no interference when opening and closing the switch. At the same time, it also enables the moving contacts to reduce the overall size of the contact seat device as much as possible while meeting the larger opening distance and moving stroke, thereby realizing the miniaturization and integrated layout design of the equipment.

[0078] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0079] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A double-break disconnector, characterized in that: It comprises a shell, a double-break isolation unit device and a grounding unit device respectively arranged on the inner side of the shell, and a driving device arranged on the outer side of the shell; The double-break isolation unit device comprises a first disc insulator, a second disc insulator, a first static contact device, a second static contact device, a moving contact seat, a first guide seat, a second guide seat, a first moving contact, a second moving contact and a supporting unit, wherein the moving contact seat is placed in a hollow cavity of the housing, the first guide seat and the second guide seat are arranged in an inner cavity of the moving contact seat, the first moving contact and the second moving contact are slidably arranged on the first guide seat and the second guide seat respectively, and the supporting unit supports the moving contact seat; The double-break isolation unit device also includes a transmission device for realizing a double-break structure and opening or closing the switch at the same time, the transmission device includes a transmission rod arranged outside the moving contact seat, and an active shaft and a connecting plate arranged inside the moving contact seat, the active shaft is rotatably arranged on the moving contact seat, a first crank arm and a second crank arm are arranged on the active shaft at intervals, the first crank arm is hinged to the first moving contact, the second crank arm is hinged to the connecting plate, the connecting plate is hinged to the second moving contact, and the transmission rod is used to connect the drive device and the active shaft; The moving paths of the first moving contact and the second moving contact are perpendicular to each other, and are staggered in a plane perpendicular to the moving direction. The central axes of the first static contact device and the second static contact device arranged opposite to each other are respectively aligned with the central axes of the first moving contact and the second moving contact. The first moving contact and the first static contact device are in contact and conduction with each other, and the second moving contact and the second static contact device are in contact and conduction with each other, and the two moving contacts and the two static contacts form a vertical double-break structure. The housing is provided with a first flange interface for fixing the second disc insulator and the second static contact device and a second flange interface for fixing the support unit at the upper and lower ends in the vertical direction, a third flange interface for fixing the first disc insulator and the first static contact device and a fourth flange interface for fixing the grounding unit device at the left and right ends in the horizontal direction, and a fifth flange interface for fixing the shaft seal cover plate at the front end in the horizontal direction; The grounding unit device is used to realize the grounding of the double-break disconnector; The driving device is arranged on the outside of the shell, and is used to drive the transmission device, thereby driving the double-break isolation unit device to realize the synchronous opening and closing actions of the first moving contact and the second moving contact, so that the double-break isolation switch meets the double-break closing or opening position function.

2. The double-break disconnector according to claim 1, characterized in that: The support unit includes an insulating support for fixing the moving contact seat and a support shield for connecting the second flange interface, so as to achieve the installation and fixation of the moving contact seat and the insulation function between the moving contact seat and the housing.

3. The double-break disconnector according to claim 1, characterized in that: The double-break isolation unit device also includes a first shielding seat and a second shielding seat arranged on both sides of a connection between the transmission rod and the moving contact seat.

4. The double-break disconnector according to claim 3, characterized in that: The first shielding seat and the second shielding seat are both bowl-shaped structures with inner holes, and the two are coaxially and symmetrically buckled on both sides of the moving contact seat.

5. The double-break disconnector according to claim 3, characterized in that: Both ends of the active rotating shaft are fixed to the first shielding seat and the second shielding seat through rolling bearings.

6. The double-break disconnector according to claim 1, characterized in that: The first moving contact and the second moving contact are respectively connected with a first fork clamping device and a second fork clamping device, the first crank arm and the first fork clamping device are connected by a slidable shaft pin, the second crank arm and the connecting plate are hinged by a pin shaft, and the connecting plate and the second fork clamping device are hinged by a pin shaft.

7. The double-break disconnector according to claim 6, characterized in that: The first clamping fork device is provided with a long hole structure for connecting with the first crank arm through the slidable shaft pin.

8. The double-break disconnector according to claim 1, characterized in that: Both side ends of the active rotating shaft are arranged as outer cylindrical shafts with inner hexagonal holes formed thereon, and the ends of the transmission rods are arranged with outer hexagonal structures for matching with the inner hexagonal holes of the active rotating shaft.

9. The double-break disconnector according to claim 1, characterized in that: The transmission device also includes a limit device arranged outside the housing, and the limit device is arranged between the drive device and the shaft seal cover plate, and is used to limit the opening and closing rotation angle.

10. The double-break disconnector according to any one of claims 1 to 9, characterized in that: The number of the double-break disconnectors is three, and the transmission rods of the three double-break isolation unit devices are connected end to end and realize synchronous opening and closing operations through one driving device.

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