A knife switch device for a C-GIS

Abstract

The utility model relates to a kind of knife switch type switch device for C-GIS, including assembly plate, circuit breaker assembly, three-station component and main circuit component, main circuit component includes three groups of knife switch type isolating switch component and transmission mechanism, three groups of knife switch type isolating switch component all include insulating cylinder and isolating knife switch, three groups of insulating cylinder are fixedly connected side by side on assembly plate, insulating pull rod towards the assembly plate is set in insulating cylinder end, isolating contact is set on the outer wall of the middle part of insulating cylinder, one end of isolating knife switch is movably connected with knife switch connecting seat, isolating contact is set on the outer wall of insulating cylinder and away from the part of assembly plate, the position of isolating contact corresponds with the position of the knife head of isolating knife switch, and the ground contact on ground row is connected with the position of the knife head of isolating knife switch on the assembly plate corresponds.The utility model can make the operation of closing and opening of GIS device more reliable, and can simplify its structure, reduce manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker switching technology, and in particular to a knife switch device for C-GIS. Background Technology

[0002] Gas-insulated switchgear (GIS) is a key component in power systems used for isolating circuits. Its core functions include opening and closing operations and grounding protection. GIS equipment adopts a fully enclosed cabinet structure, with SF6 gas filling the interior as the insulating medium. It mainly includes components such as circuit breakers, disconnecting switches, grounding switches, and busbars. Existing GIS devices typically use a combination of stationary and moving contacts in the main circuit to achieve the closing, isolation, and grounding operations of a three-position disconnecting switch. The stationary contact is usually a flexible snap-fit ​​component, while the moving contact is a long copper busbar. This arrangement results in significant frictional resistance between the moving and stationary contacts during closing and opening, leading to a decrease in contact performance over time. Furthermore, existing three-position switches have separate disconnecting, grounding, and moving contacts from the insulating cylinder, requiring connection via copper busbars, which complicates the connection structure and increases manufacturing costs. Therefore, improvements are needed. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of existing GIS devices described in the background art and to provide a knife switch device for C-GIS.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A knife-switch type switchgear for C-GIS includes an assembly plate, a circuit breaker assembly, a three-position assembly, and a main circuit assembly. The circuit breaker assembly and the three-position assembly are located on one side of the assembly plate, and the main circuit assembly is located on the other side. The main circuit assembly includes three sets of knife-switch type disconnecting switch assemblies and a transmission mechanism. Each of the three sets of knife-switch type disconnecting switch assemblies includes an insulating cylinder and an isolating knife switch. The three insulating cylinders are fixedly connected side by side to the assembly plate. The insulating pull rods at the ends of the insulating cylinders face the assembly plate. A knife switch connecting seat is provided on the outer wall of the middle part of the insulating cylinder. One end of the isolating knife switch is movably connected to the knife switch connecting seat. An isolating contact is provided on the outer wall of the insulating cylinder away from the assembly plate. The position of the isolating contact corresponds to the position of the knife switch head at the other end of the isolating knife switch. A grounding device is connected to the assembly plate. The circuit breaker assembly has three grounding contacts on its grounding busbar, the positions of which correspond to the positions of the three isolating switch heads. The transmission mechanism includes an isolating shaft and a linkage mechanism. The output shaft of the three-position assembly is connected to a driving bevel gear, and the isolating shaft is connected to a driven bevel gear. The output shaft of the three-position assembly drives the isolating shaft to rotate through the bevel gear set. There are three sets of linkage mechanisms, the positions of which correspond to the positions of the three isolating switches. One end of the linkage mechanism is fixedly connected to the isolating shaft, and the other end is movably connected to the middle of the isolating switch. The main shaft of the circuit breaker assembly has three sets of main shaft crank arms, the positions of which correspond to the positions of the three insulating cylinders. The three sets of main shaft crank arms are connected to the insulating pull rods at the ends of the corresponding insulating cylinders through push-pull assemblies.

[0005] In the above scheme, each isolating switch includes two copper plates. The ends of the two copper plates are movably connected to the switch connecting seat via a connecting shaft. The end of the connecting rod of the linkage mechanism is hinged between the two copper plates. Arc-shaped protrusions are provided on the opposing inner surfaces of the switch heads at the other ends of the two copper plates. The thickness of the isolating contact and the grounding contact is adapted to the distance between the two copper plates. Both the isolating contact and the grounding contact have transition zones at their ends, which are curved surfaces with gradually decreasing thickness. This design allows the isolating switch to better cooperate with the isolating contact and the grounding contact, resulting in better conductivity. Furthermore, it reduces resistance during disconnection and ensures conductivity even after long-term use and partial wear.

[0006] In the above scheme, the assembly plate is provided with an insulating cylinder assembly seat for assembling the insulating cylinder. The insulating cylinder assembly seat has a cavity inside. The insulating pull rod assembly end of the insulating cylinder is fixedly connected to the insulating cylinder assembly seat. The insulating pull rod of the insulating cylinder extends into the cavity and is connected to the main shaft crank arm of the circuit breaker assembly through a push-pull assembly. This design makes the assembly of the insulating cylinder more stable and facilitates the connection between the insulating pull rod and the main shaft crank arm of the circuit breaker assembly.

[0007] In the above scheme, a cylindrical protrusion is provided on the outer wall of the middle part of the insulating cylinder. The knife switch connector includes a circular base plate at the bottom and a lug fixedly connected to the circular base plate. The isolating knife switch is hinged to the lug via a hinge shaft. The circular base plate is fixedly connected to the cylindrical protrusion by bolts. The knife switch connector is a conductor, and it is electrically connected to the lower output terminal inside the cylindrical protrusion. This design allows the knife switch connector and the isolating knife switch to be directly connected to the insulating cylinder, and enables them to be directly electrically connected to the lower output terminal without the need for additional copper busbars, simplifying the connection structure and reducing equipment manufacturing costs.

[0008] In the above design, a cylindrical protrusion is located near the distal end of the outer wall of the insulating cylinder. An isolating contact mounting base is fixedly connected to this protrusion. The upper lead-out end of the insulating cylinder is located inside the protrusion. The isolating contact mounting base is a conductor and is electrically connected to the upper lead-out end. The isolating contact is fixedly connected to the side of the isolating contact mounting base facing the mounting plate. This design allows the isolating contact mounting base and the isolating contact to be directly connected to the insulating cylinder and electrically connected to the upper lead-out end, eliminating the need for additional copper busbars, simplifying the connection structure, and reducing equipment manufacturing costs.

[0009] In the above scheme, the isolating contact mounting base is an angle iron-shaped copper busbar. A fixed support plate is provided on the side of the isolating contact mounting base away from the mounting plate. The fixed support plate and the isolating contact mounting base are fixedly connected to the upper outgoing end inside the protrusion by bolts. This design makes the shape of the isolating contact mounting base more stable, preventing deformation during use, thereby making the position of the isolating contact more stable and improving the fit between the isolating switch and the isolating contact.

[0010] In the above scheme, the three-station assembly is positioned above the circuit breaker assembly.

[0011] In the above design, the assembly plate is provided with an upper mounting base, which is positioned above the insulating cylinder. The upper mounting base has an internal cavity, and bearing seats are located on both sides. The two ends of the isolating shaft are movably connected to the bearing seats, and the isolating shaft is disposed within the cavity of the upper mounting base. The grounding busbar is fixedly connected to the outer wall of the upper mounting base. This design allows for a more compact arrangement of the isolating shaft and grounding busbar, simplifying their structure and saving installation space.

[0012] This invention offers several advantages: The knife-switch switchgear for C-GIS features optimized structural design for the isolating knife switch, grounding contact, and isolating contact, resulting in more reliable closing and opening operations. Furthermore, by connecting the isolating knife switch and isolating contact to an insulating cylinder, the invention eliminates the need for connecting copper busbars between the upper and lower leads of the insulating cylinder and the isolating contact and knife switch, simplifying the structure and reducing manufacturing costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the knife switch device for C-GIS according to this utility model.

[0014] Figure 2 This is a schematic diagram of the knife switch device for C-GIS of this utility model (the upper mounting base is not shown).

[0015] Figure 3 This is a schematic diagram of the connection structure between the main shaft and the insulating cylinder of the circuit breaker assembly.

[0016] Figure 4 This is a schematic diagram of the connection structure between the output shaft, isolation shaft, and isolation switch of the three-station component.

[0017] Figure 5 This is a schematic diagram of the connection structure between the grounding contact and the grounding busbar.

[0018] Figure 6 This is a schematic diagram of the connection structure between the isolation contact and the isolation contact mounting base.

[0019] The reference numerals in the figure are as follows: Assembly plate 1, Circuit breaker assembly 2, Main shaft 21, Main shaft crank arm 22, Push-pull assembly 23, Hinge seat 231, Double connecting rod 232, Connecting block 233, Three-station assembly 3, Output shaft 31, Driving bevel gear 32, Driven bevel gear 33, Main circuit assembly 4, Insulating cylinder 41, Insulating pull rod 411, Cylindrical protrusion 412, Knife switch connecting seat 413, Circular seat plate 4131, Lug 4132, Protrusion 414, Isolating contact mounting seat 415, Fixed support plate 4151, Isolating contact 4152, Isolating knife switch 42, Copper plate 421, Knife switch head 422, Arc-shaped protrusion 423, Upper mounting seat 43, Bearing seat 431, Insulating cylinder assembly seat 44, Isolating shaft 45, Linkage mechanism 46, Grounding busbar 47, Grounding contact 471, Transition zone 472. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below through embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1 As shown, the knife switch device for C-GIS of this utility model includes an assembly plate 1, a circuit breaker assembly 2, a three-position assembly 3, and a main circuit assembly 4.

[0022] The main improvement of this utility model lies in the main circuit assembly. Both the circuit breaker assembly 2 and the three-position assembly 3 can adopt existing designs, such as the circuit breaker operating mechanism disclosed in patent document CN114937572A and the three-position operating mechanism disclosed in patent document CN114883153A. An interlocking component can be installed between the circuit breaker assembly 2 and the three-position assembly 3 to ensure that the closing and opening operations of the GIS device conform to its designed operating logic, guaranteeing the safety and effectiveness of the closing and opening operations. The design of the interlocking component can refer to the adopted technology, such as the interlocking mechanism in patent document CN105070550A.

[0023] When the assembly plate 1 is placed vertically, the circuit breaker assembly 2 and the three-position assembly 3 are located on the front side of the assembly plate 1, the main circuit assembly 4 is located on the rear side of the assembly plate, and the three-position assembly 3 is located above the circuit breaker assembly 2.

[0024] The main shaft of the circuit breaker assembly 2 can be arranged on the front side of the mounting plate 1 in the left-right direction. Three sets of main shaft crank arms 22 are provided on the main shaft 21. The three sets of main shaft crank arms 22 are fixedly connected to the main shaft 21. The three sets of main shaft crank arms 22 are respectively connected to the insulating pull rods 411 at the end of the corresponding insulating cylinders 41 through the push-pull assembly 23. The mounting plate 1 is provided with through holes corresponding to the insulating pull rods 411. The end of the insulating pull rods 411 passes through the through holes and is connected to the push-pull assembly 23.

[0025] The push-pull assembly 23 includes a hinge seat 231, double connecting rods 232, and a connecting block 233. The hinge seat 231 is fixedly connected to the assembly plate 1. The double connecting rods 232 are hinged to each other. The upper connecting rod is hinged to the main shaft crank arm 22, and the lower connecting rod is hinged to the hinge seat 231. The lower connecting rod includes two rods arranged longitudinally side by side at a certain distance. The connecting block 233 is disposed between the two rods. The end of the insulating pull rod 411 at the end of the insulating cylinder 41 passes through the through hole on the connecting block 233 and is fixedly connected to the connecting block 233 by bolts or pins. When the main shaft 21 of the circuit breaker assembly 2 rotates, the main shaft crank arm 22 rotates accordingly, pushing the lower connecting rod to move through the upper connecting rod. At the same time, the connecting block 233 applies a pushing or pulling force to the insulating pull rod 411, causing the insulating pull rod 411 to move, thereby realizing the connection or disconnection of the contacts inside the insulating cylinder 41.

[0026] The output shaft 31 of the three-station assembly 3 is arranged along the front-to-back direction, extending from the front side of the assembly plate 1 to the rear side of the assembly plate 1. A driving bevel gear 32 is provided at the end of the output shaft 31, and an isolation shaft 45 is provided at the rear side of the assembly plate 1. The isolation shaft 45 is arranged horizontally, and a driven bevel gear 33 matching the driving bevel gear 32 is provided on the isolation shaft 45. Through the transmission of the driving bevel gear 32 and the driven bevel gear 33, the output shaft 31 can drive the isolation shaft 45 to rotate.

[0027] The main circuit assembly 4 includes three sets of knife-type disconnector assemblies and a transmission mechanism. Each of the three sets of knife-type disconnector assemblies includes an insulating cylinder 41 and an isolating knife switch 42. The three sets of insulating cylinders 41 are fixedly connected side by side to the mounting plate 1. The insulating pull rod 411 at the end of the insulating cylinder 41 is set towards the mounting plate 1. A knife switch connecting seat 413 is provided on the outer wall of the middle part of the insulating cylinder 41. One end of the isolating knife switch 42 is movably connected to the knife switch connecting seat 413. An isolating contact 4152 is provided on the outer wall of the insulating cylinder 41 at a position away from the mounting plate 1. The position of the isolating contact 4152 corresponds to the position of the knife switch head 422 at the other end of the isolating knife switch 42. A grounding bar 47 is connected to the mounting plate 1. Three grounding contacts 471 are provided on the grounding bar 47. The positions of the three grounding contacts 471 correspond to the positions of the knife switch heads 422 of the three isolating knife switches 42.

[0028] The transmission mechanism includes an isolation shaft 45 and a linkage mechanism 46. The arrangement of the isolation shaft 45 can be designed as needed. Preferably, an upper mounting base 43 can be provided on the upper rear side of the assembly plate 1. The upper mounting base 43 is positioned above the insulating cylinder 41. The upper mounting base 43 has an internal cavity, and bearing seats 431 are provided on both sides of the upper mounting base 43. The two ends of the isolation shaft 45 are movably connected to the bearing seats 431 respectively. The isolation shaft 45 is located within the cavity of the upper mounting base 43, and the grounding bus 47 is fixedly connected to the outer wall of the upper mounting base 43. This design allows for a more compact arrangement of the isolation shaft 45 and the grounding bus 47, simplifying its structure and saving installation space.

[0029] The linkage mechanism 46 is configured such that three sets of double linkages are connected to the isolation shaft 45. The positions of the three sets of double linkages correspond to the positions of the three sets of isolating switches 42. One end of the double linkage is fixedly connected to the isolation shaft 45, and the other end of the double linkage is hinged to the isolating switch 42.

[0030] An insulating cylinder mounting base 44 is provided on the lower rear side of the mounting plate 1. The insulating cylinder mounting base 44 has a cavity inside, and three mounting ports are provided on the rear side plate of the insulating cylinder mounting base 44. The mounting ends of the insulating pull rods 411 of the three sets of insulating cylinders 41 are respectively fixedly connected to the mounting ports on the insulating cylinder mounting base 44. The insulating pull rods 411 of the insulating cylinders 41 extend into the cavity and pass through the through holes on the mounting plate 1, connecting to the main shaft crank arm 22 of the circuit breaker assembly 2 via the push-pull assembly 23. This design makes the assembly of the insulating cylinders 41 more stable and facilitates the connection between the insulating pull rods 411 and the main shaft crank arm of the circuit breaker assembly.

[0031] A cylindrical protrusion 412 is provided on the outer wall of the middle part of the insulating cylinder 41. The knife switch connector 413 includes a circular base plate 4131 at the bottom and a lug 4132 fixedly connected to the circular base plate 4131. The isolating knife switch 42 is hinged to the lug 4132 through a hinge shaft. The circular base plate 4131 is fixedly connected to the cylindrical protrusion 412 by bolts. The knife switch connector 413 is a conductor and is electrically connected to the lower outlet end inside the cylindrical protrusion 412. With this design, the knife switch connector 413 and the isolating knife switch 42 can be directly connected to the insulating cylinder 41, and the knife switch connector 413 and the isolating knife switch 42 can be directly electrically connected to the lower outlet end without the need for additional copper busbars, simplifying the connection structure and reducing equipment manufacturing costs.

[0032] A cylindrical protrusion 414 is provided on the outer wall of the insulating cylinder 41 near its distal end. An isolating contact mounting base 415 is fixedly connected to the protrusion 414. The upper lead-out end of the insulating cylinder 41 is located inside the protrusion 414. The isolating contact mounting base 415 is a conductor and is electrically connected to the upper lead-out end. The isolating contact 4152 is fixedly connected to the side of the isolating contact mounting base 415 facing the mounting plate 1. This design allows the isolating contact mounting base 415 and the isolating contact 4152 to be directly connected to the insulating cylinder and to be directly electrically connected to the upper lead-out end, eliminating the need for additional copper busbars, simplifying the connection structure, and reducing equipment manufacturing costs.

[0033] The isolating contact mounting base 415 is an angle iron-shaped copper busbar. A fixed support plate 4151 is provided on the side of the isolating contact mounting base 415 away from the mounting plate 1. The fixed support plate 4151 and the isolating contact mounting base 415 are fixedly connected to the upper outgoing end in the protrusion 414 by bolts. This design makes the shape of the isolating contact mounting base 415 more stable, preventing deformation during use, thereby making the position of the isolating contact more stable and improving the fit between the isolating switch 42 and the isolating contact 4152.

[0034] Each isolating switch 42 includes two elongated copper plates 421. The ends of the two copper plates 421 are movably connected to the switch connecting seat 413 via a connecting shaft. The connecting rod end of the linkage mechanism 46 is hinged between the two copper plates 421. Arc-shaped protrusions 423 are provided on the opposing inner surfaces of the switch heads 422 at the other ends of the two copper plates 421. The thickness of the isolating contact 4152 and the grounding contact 471 is adapted to the distance between the two copper plates 421. Both the ends of the isolating contact 4152 and the grounding contact 471 are provided with transition areas 472, which are curved surfaces with gradually decreasing thickness. This design allows the isolating switch 42 to better cooperate with the isolating contact 4152 and the grounding contact 471, resulting in better conductivity. Furthermore, it reduces resistance during disconnection and ensures conductivity even after partial wear over long-term use.

[0035] This utility model discloses a knife-type switchgear for C-GIS, which optimizes the structure of the isolating knife switch, grounding contact, and isolating contact, making its closing and opening operations more reliable. This utility model's knife-type switchgear for C-GIS connects the isolating knife switch and isolating contact to an insulating cylinder, eliminating the need for connecting copper busbars between the upper and lower leads of the insulating cylinder and the isolating contact and isolating knife switch, thus simplifying the structure and reducing manufacturing costs.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A knife switch device for C-GIS, characterized in that, The assembly includes an assembly plate, a circuit breaker assembly, a three-position assembly, and a main circuit assembly. The circuit breaker assembly and the three-position assembly are located on one side of the assembly plate, and the main circuit assembly is located on the other side. The main circuit assembly includes three sets of knife-switch type disconnector assemblies and a transmission mechanism. Each of the three sets of knife-switch type disconnector assemblies includes an insulating cylinder and an isolating knife switch. The three insulating cylinders are fixedly connected side by side to the assembly plate. The insulating pull rods at the ends of the insulating cylinders face the assembly plate. A knife switch connecting seat is provided on the outer wall of the middle part of the insulating cylinder. One end of the isolating knife switch is movably connected to the knife switch connecting seat. An isolating contact is provided on the outer wall of the insulating cylinder away from the assembly plate. The position of the isolating contact corresponds to the position of the knife switch head at the other end of the isolating knife switch. A grounding bar is connected to the assembly plate, and a grounding bar is provided on the grounding bar. The circuit breaker assembly has three grounding contacts, the positions of which correspond to the positions of the three isolating switches. The transmission mechanism includes an isolating shaft and a linkage mechanism. The output shaft of the three-position assembly is connected to a driving bevel gear, and the isolating shaft is connected to a driven bevel gear. The output shaft of the three-position assembly drives the isolating shaft to rotate through the bevel gear set. There are three sets of linkage mechanisms, the positions of which correspond to the positions of the three isolating switches. One end of the linkage mechanism is fixedly connected to the isolating shaft, and the other end is movably connected to the middle of the isolating switch. The main shaft of the circuit breaker assembly is provided with three sets of main shaft crank arms, the positions of which correspond to the positions of the three insulating cylinders. The three sets of main shaft crank arms are connected to the insulating pull rods at the ends of the corresponding insulating cylinders through push-pull assemblies.

2. The knife switch device for C-GIS according to claim 1, characterized in that: Each isolating switch includes two copper plates, the ends of which are movably connected to the switch connecting seat via a connecting shaft. The connecting rod end of the linkage mechanism is hinged between the two copper plates. The inner surfaces of the switch heads at the other ends of the two copper plates are provided with arc-shaped protrusions. The thickness of the isolating contact and the grounding contact is adapted to the distance between the two copper plates. The ends of the isolating contact and the grounding contact are provided with transition areas, which are curved surfaces with gradually decreasing thickness.

3. The knife switch device for C-GIS according to claim 1, characterized in that: The assembly plate is provided with an insulating cylinder assembly seat for assembling the insulating cylinder. The insulating cylinder assembly seat has a cavity inside. The insulating pull rod assembly end of the insulating cylinder is fixedly connected to the insulating cylinder assembly seat. The insulating pull rod of the insulating cylinder extends into the cavity and is connected to the main shaft crank arm of the circuit breaker assembly through a push-pull assembly.

4. The knife switch device for C-GIS according to claim 1, characterized in that: The insulating cylinder has a cylindrical protrusion on its middle outer wall. The knife switch connector includes a circular base plate at the bottom and a lug fixedly connected to the circular base plate. The isolating knife switch is hinged to the lug via a hinge shaft. The circular base plate is fixedly connected to the cylindrical protrusion by bolts. The knife switch connector is a conductor and is electrically connected to the lower output end inside the cylindrical protrusion.

5. The knife switch device for C-GIS according to claim 1, characterized in that: A cylindrical protrusion is provided on the outer wall of the insulating cylinder near the far end. An isolation contact mounting seat is fixedly connected to the protrusion. The upper lead-out end of the insulating cylinder is provided inside the protrusion. The isolation contact mounting seat is a conductor and is electrically connected to the upper lead-out end. The isolation contact is fixedly connected to the side of the isolation contact mounting seat facing the assembly plate.

6. The knife switch device for C-GIS according to claim 5, characterized in that: The isolating contact mounting base is an angle iron-shaped copper busbar. A fixed support plate is provided on the side of the isolating contact mounting base away from the assembly plate. The fixed support plate and the isolating contact mounting base are fixedly connected to the upper outgoing end in the protrusion by bolts.

7. The knife switch device for C-GIS according to claim 1, characterized in that: The three-position assembly is positioned above the circuit breaker assembly.

8. The knife switch device for C-GIS according to claim 1, characterized in that: The assembly plate is provided with an upper mounting seat, which is located above the insulating cylinder. The upper mounting seat has a cavity inside and bearing seats on both sides. The two ends of the isolation shaft are movably connected to the bearing seats respectively. The isolation shaft is located in the cavity of the upper mounting seat, and the grounding bar is fixedly connected to the outer wall of the upper mounting seat.

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