Isolation of upper and lower circuit breaker switch cabinet plug-in door interlocking mechanism

Abstract

The application relates to an upper-isolation lower-circuit-breaker switch cabinet plug-in cabinet door interlocking mechanism, which comprises a cabinet body, a lower door and an interlocking assembly. The interlocking assembly comprises an interlocking rod, a lower-door interlocking set, a lower-door interlocking plate, a lower-door limiting set, a grounding operation shaft and a switching operation shaft. When the switching operation shaft and the grounding operation shaft rotate to the switching position respectively, the lower-door interlocking set and the lower-door interlocking plate limit the upward movement of the interlocking rod, and the interlocking rod and the lower door can be locked. A limiting convex ring of the lower-door limiting set is arranged on the interlocking rod. When the lower door is opened, the lower-door limiting set limits the downward movement of the interlocking rod, the lower-door interlocking plate moves upward along the interlocking rod and abuts against a switching half shaft of a circuit breaker operation, the lower-door interlocking plate can limit the switching half shaft to perform a switching action, when the lower door is closed, the lower-door limiting set and the limiting convex ring are freely matched, and one end of the interlocking rod is inserted into an interlocking hole of the lower door due to gravity. The application has the advantages of simple structure, stable and reliable performance, convenient operation, low cost and safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and specifically to a plug-in cabinet door interlocking mechanism for an upper isolator and lower circuit breaker switchgear. Background Technology

[0002] The main function of switchgear is to open, close, control, and protect electrical equipment during the power generation, transmission, distribution, and energy conversion processes in a power system. The main components of switchgear include circuit breakers, disconnect switches, load switches, operating mechanisms, instrument transformers, and various protective devices. It is mainly applicable to various settings such as power plants, substations, petrochemical plants, metallurgical steel rolling mills, light industry textiles, factories and mines, residential communities, and high-rise buildings. In power transmission and transformation systems, switchgear is a crucial electrical device. Misoperation can lead to equipment damage, power system failures, and even personal injury. Therefore, ring main units must possess a complete and reliable "five-proof interlocking" function to ensure the safe operation of personnel and the power grid.

[0003] The switchgear contains a disconnecting switch, a disconnecting switch operating mechanism, a circuit breaker, and a circuit breaker operating mechanism. The disconnecting switch operating mechanism controls the disconnecting switch's blade to operate between three positions: disconnecting closed, disconnecting open (which is also grounding open), and grounding closed. The circuit breaker operating mechanism controls the vacuum bulb within the circuit breaker to perform opening and closing operations. To ensure safety during operation, the following two points must be ensured for the upper disconnecting and lower circuit breaker switchgear: 1. When the cabinet door is closed, the cabinet door must not be opened when the grounding operating shaft rotates to the grounding open position; 2. The circuit breaker must not be able to open when the cabinet door is open.

[0004] When the switchgear is in operation, the cabinet door must be closed, and the live parts must be enclosed in the cable compartment to protect personal safety. The switchgear door interlocking mechanism is a set of interlocking devices installed between the cabinet door and the three-position disconnector and vacuum circuit breaker to prevent accidental entry into the live compartment. Once the switchgear is energized and the cabinet door interlock is correctly locked, it cannot be opened unless forcibly broken. The existing cabinet door interlocking mechanism has an unreasonable structural design. When the cabinet door is not closed properly or is forcibly pulled down, it may cause the cabinet door interlocking mechanism to fail, which can easily lead to safety accidents. Therefore, the cabinet door interlocking mechanism has the defects of unreliability and low safety. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simple, stable and reliable, easy-to-operate, low-cost, and safe plug-in cabinet door interlocking mechanism for upper-isolation and lower-circuit breaker switchgear.

[0006] To achieve the above objectives, the present invention employs an insert-type cabinet door interlocking mechanism for an upper-isolated, lower-circuit breaker switchgear, comprising a cabinet body, a lower door, and an interlocking assembly. The interlocking assembly includes an interlocking rod that is longitudinally movable and engages with an interlocking hole in the lower door; a grounding lower door interlocking group that engages with the grounding operating shaft of the isolating operating mechanism; a lower door interlocking plate linked to the interlocking rod and engaging with the opening / closing operating shaft of the circuit breaker operating mechanism; and a lower door limit group disposed within the cabinet and engaging with the interlocking rod. The grounding operating shaft and the opening / closing operating shaft are respectively rotated to the open position. When the lower door is open, the grounding lower door interlock group and the lower door interlock plate restrict the interlock rod from moving upward and can lock the interlock rod to the lower door. The interlock rod is provided with a limiting protrusion ring that is connected to the lower door limiting group. When the lower door is open, the lower door limiting group restricts the interlock rod from moving downward, and the lower door interlock plate moves upward with the interlock rod and abuts against the circuit breaker's tripping half shaft. The lower door interlock plate can restrict the tripping half shaft from performing the tripping action. When the lower door is closed, the lower door limiting group and the limiting protrusion ring cooperate freely, and one end of the interlock rod is inserted into the interlock hole of the lower door due to its own weight.

[0007] The beneficial effects of the above structure are as follows: The cabinet door interlocking mechanism adopts an insertion-type structure design, making the interlocking more reliable. It can prevent the lower door from being opened by force, and the lower door limit group can only unlock with the interlocking rod when the lower door is fully closed. The interlocking rod then inserts into the interlocking hole of the lower door due to its own weight, avoiding live operation and thus enhancing the safety of the cabinet door interlocking mechanism. Furthermore, the grounded lower door interlocking group of the cabinet door interlocking mechanism can achieve interlocking between the operating mechanism and the lower door. This grounded lower door interlocking group has a simple structure, better strength, and better interlocking reliability. When the grounded operating shaft is rotated to the open position, the grounded lower door interlocking group can restrict the upward movement of the interlocking rod, ensuring that the interlocking rod can reliably lock the lower door, preventing it from opening. When the grounded operating shaft is rotated to the closed position, the interlocking rod loses the limit of the grounded lower door interlocking group and can move upward, allowing the lower door to open. The lower door limit switch assembly enables reliable locking or unlocking of the lower door with the isolation operating mechanism and the circuit breaker operating mechanism. When the lower door is open, the lower door limit switch assembly restricts the interlocking rod from moving downwards. The interlocking rod can lock the tripping half-shaft through the lower door interlocking plate, preventing the circuit breaker operating mechanism from performing a tripping operation. Furthermore, after the lower door is fully closed, the lower door limit switch assembly and the interlocking rod freely engage, and the interlocking rod, due to its own weight, inserts into the interlocking hole of the lower door, achieving interlocking between the interlocking rod and the lower door. Therefore, this cabinet door interlocking mechanism has the advantages of simple structure, stable and reliable performance, convenient operation, low cost, and high safety.

[0008] Specifically, the lower door limiting assembly includes a bracket installed inside the cabinet, a limiting plate slidably mounted on the bracket, and a tension spring positioned between the limiting plate and the bracket. One end of the limiting plate has a latch that engages with a limiting protrusion ring, and the other end has a drive portion that engages with the lower door. When the lower door is closed, it abuts against the drive portion, allowing for free engagement between the latch and the limiting protrusion ring. When the lower door is open, the latch engages with the limiting protrusion ring, forming a limiting engagement between them. The lower door limiting assembly enables reliable locking or unlocking of the lower door with the isolation operating mechanism and the circuit breaker operating mechanism, thus improving the safety performance of the cabinet door interlocking mechanism. When the lower door is closed, the lower door activates the limiting plate of the lower door limiting assembly. The limiting plate unlocks the limiting protrusion of the interlocking rod, and the interlocking rod inserts into the interlocking hole of the lower door due to its own weight. When the lower door is opened, the limiting protrusion moves upward with the interlocking rod, and the limiting plate loses its limiting effect on the lower door. The locking tongue of the limiting plate abuts against the lower end of the limiting protrusion, thereby unlocking the lower door and the interlocking rod. The interlocking rod can only be inserted into the interlocking hole of the lower door after the lower door is closed, which greatly improves the safety performance of the cabinet door interlocking mechanism.

[0009] Specifically, the grounding lower door interlock assembly includes a cam linked to the grounding operating shaft and a limiting member slidably mounted on the isolation operating mechanism and cooperating with the cam. The limiting member includes a limiting rod slidably mounted on the isolation operating mechanism at a corresponding interlocking rod position, and a guide plate linked to the limiting rod and cooperating with the cam. The guide plate moves with the cam and drives the limiting rod to move, with the limiting rod abutting against the interlocking rod, forming a limiting engagement between the limiting rod and the interlocking rod. This grounding lower door interlock assembly has a simple structure, reliable interlocking, and higher strength. When the grounding operating shaft rotates to the open position, the cam abuts against the guide plate, and the guide plate drives the limiting rod to abut against the interlocking rod. The interlocking rod inserts into the interlocking hole of the lower door, locking the lower door and preventing it from opening. When the grounding operating shaft rotates to the closed position, the guide plate loses the restriction of the cam, and the interlocking rod can move upward, thereby unlocking the lower door.

[0010] Specifically, the lower door interlocking plate has a first limiting part that cooperates with the opening half-shaft. A locking plate that cooperates with the first limiting part is linked to the opening half-shaft. The first limiting part moves upward with the lower door interlocking plate and abuts against the locking plate, forming a limiting cooperation between the locking plate and the first limiting part. When the opening / closing operating shaft is in the closed position, the first limiting part of the lower door interlocking plate abuts against the locking plate, preventing the opening / closing half-shaft from rotating to the open position, thereby improving the safety performance of the cabinet door interlocking mechanism.

[0011] Specifically, the lower door interlocking plate has a second limiting part that cooperates with the opening and closing operating shaft. A stop block that cooperates with the second limiting part is linked to the opening and closing operating shaft. When the opening and closing operating shaft rotates to the open position, the stop block moves with the shaft and abuts against the second limiting part, forming a limiting cooperation between the stop block and the second limiting part. When the opening and closing operating shaft rotates to the closed position, the stop block and the second limiting part freely cooperate. The second limiting part on the lower door interlocking plate, cooperating with the stop block on the opening and closing operating shaft, allows the circuit breaker and the lower door to be locked when the operating shaft is in the open position, preventing the lower door from opening. This improves the interlocking reliability and safety of the cabinet door interlocking mechanism.

[0012] Specifically, the lower door interlock plate is provided with a guide groove, and the circuit breaker operating mechanism is provided with a bracket that cooperates with the lower door interlock plate. The bracket is provided with a guide rail that cooperates with the guide groove, and the guide groove is slidably disposed on the guide rail, forming a sliding connection between the lower door interlock plate and the bracket. The guide groove of the lower door interlock plate is slidably disposed on the bracket, thereby ensuring that the lower door interlock plate can reliably slide on the bracket, which helps to improve the working reliability of the cabinet door interlock mechanism.

[0013] Specifically, the bracket is provided with guide posts that cooperate with the lower door interlock plate, and the lower door interlock plate is provided with sliding holes that cooperate with the guide posts. The guide posts are inserted into the sliding holes, forming a sliding connection between the guide posts and the lower door interlock plate. The guide posts on the bracket can guide the lower door interlock plate, ensuring reliable operation of the lower door interlock plate and improving the working reliability of the cabinet door interlock mechanism. Attached Figure Description

[0014] Figure 1 This is a perspective view of the internal structure of the switch cabinet according to an embodiment of the present invention.

[0015] Figure 2 This is a front view of the internal structure of the switch cabinet according to an embodiment of the present invention.

[0016] Figure 3 for Figure 2 Sectional view of AA.

[0017] Figure 4 This is a perspective view of an embodiment of the present invention.

[0018] Figure 5 This describes the assembly of the door interlock plate and the bracket in an embodiment of the present invention.

[0019] Figure 6 This is a perspective view of the door limit assembly according to an embodiment of the present invention. Detailed Implementation

[0020] like Figures 1-6 As shown, this embodiment of the invention is an insert-type cabinet door interlocking mechanism for an upper-isolated, lower-circuit breaker switchgear, including a cabinet body 10, a lower door 11, and an interlocking assembly 20. The interlocking assembly 20 includes an interlocking rod 21 that is longitudinally movable and engages with the interlocking hole 111 of the lower door 11; a grounding lower door interlocking group 30 that engages with the grounding operating shaft 120 of the isolation operating mechanism 12; a lower door interlocking plate 22 that is linked to the interlocking rod 21 and engages with the opening / closing operating shaft 130 of the circuit breaker operating mechanism 13; and a lower door limiting group 40 located inside the cabinet body 10 and engaging with the interlocking rod 21. When the grounding operating shaft 120 and the opening / closing operating shaft 130 are rotated to the open position, the interlocking... The underground door interlocking group 30 and the lower door interlocking plate 22 restrict the interlocking rod 21 from moving upward and can lock the interlocking rod 21 with the lower door 11. The interlocking rod 21 is provided with a limiting protrusion ring 211 that is connected to the lower door limiting group 40. When the lower door 11 is opened, the lower door limiting group 40 restricts the interlocking rod 21 from moving downward, and the lower door interlocking plate 22 moves upward with the interlocking rod 21 and abuts against the tripping half shaft 131 of the circuit breaker operation 13. The lower door interlocking plate 22 can restrict the tripping half shaft 131 from performing the tripping action. When the lower door 11 is closed, the lower door limiting group 40 and the limiting protrusion ring 211 cooperate freely, and one end of the interlocking rod 21 is inserted into the interlocking hole 111 of the lower door 11 due to its own weight.

[0021] like Figure 1 , 3 As shown in Figure 4, the lower door limiting assembly 40 includes a bracket 41 disposed within the cabinet 10, a limiting plate 42 slidably disposed on the bracket 41, and a tension spring 43 disposed between the limiting plate 42 and the bracket 41. One end of the limiting plate 42 has a locking tongue 421 that cooperates with a limiting protrusion 211, and the other end has a driving part 422 that cooperates with the lower door 11. When the lower door 11 is closed, it abuts against the driving part 422, allowing free cooperation between the locking tongue 421 and the limiting protrusion 211. When the lower door 11 is open, the locking tongue 421 engages with the limiting protrusion 211, forming a limiting cooperation between the locking tongue 421 and the limiting protrusion 211. The lower door limiting assembly can reliably lock or unlock the lower door with the isolation operating mechanism and the circuit breaker operating mechanism, which is beneficial to improving the safety performance of the cabinet door interlocking mechanism. When the lower door is closed, the lower door activates the limiting plate of the lower door limiting assembly. The limiting plate unlocks the limiting protrusion of the interlocking rod, and the interlocking rod inserts into the interlocking hole of the lower door due to its own weight. When the lower door is opened, the limiting protrusion moves upward with the interlocking rod, and the limiting plate loses its limiting effect on the lower door. The locking tongue of the limiting plate abuts against the lower end of the limiting protrusion, thereby unlocking the lower door and the interlocking rod. The interlocking rod can only be inserted into the interlocking hole of the lower door after the lower door is closed, which greatly improves the safety performance of the cabinet door interlocking mechanism.

[0022] like Figure 1 , 2 As shown, the grounding lower door interlock assembly 30 includes a cam 31 linked to the grounding operating shaft 120 and a limiting member 32 slidably mounted on the isolation operating mechanism 12 and cooperating with the cam 31. The limiting member 32 includes a limiting rod 321 slidably mounted on the isolation operating mechanism 12 at a corresponding position to the interlocking rod 21, and a guide plate 322 linked to the limiting rod 321 and cooperating with the cam 31. The guide plate 322 moves with the cam 31 and can drive the limiting rod 321 to move. The limiting rod 321 abuts against the interlocking rod 21, forming a limiting engagement between the limiting rod 321 and the interlocking rod 21. This grounding lower door interlock assembly has a simple structure, reliable interlocking, and higher strength. When the grounding operating shaft rotates to the open position, the cam abuts against the guide plate, and the guide plate drives the limiting rod to abut against the interlocking rod. The interlocking rod is inserted into the interlocking hole of the lower door, and the lower door is locked by the interlocking rod, preventing the lower door from opening. When the grounding operating shaft rotates to the closed position, the guide plate loses the restriction of the cam, and the interlocking rod can move upward, thereby unlocking the lower door.

[0023] like Figure 2 and 5As shown, the lower door interlock plate 22 has a first limiting part 221 that cooperates with the opening half shaft 131. A locking plate 132 that cooperates with the first limiting part 221 is linked to the opening half shaft 131. The first limiting part 221 moves upward with the lower door interlock plate 22 and can abut against the locking plate 132, thus forming a limiting cooperation between the locking plate 132 and the first limiting part 221. When the opening / closing operation shaft is in the closed position, the first limiting part of the lower door interlock plate abuts against the locking plate, preventing the opening / closing half shaft from rotating to the open position, thereby improving the safety performance of the cabinet door interlock mechanism. The lower door interlock plate 22 has a second limiting part 222 that cooperates with the opening / closing operating shaft 130. A stop block 133 that cooperates with the second limiting part 222 is linked to the opening / closing operating shaft 130. When the opening / closing operating shaft 130 rotates to the open position, the stop block 133 moves with the shaft and abuts against the second limiting part 222, forming a limiting cooperation between the stop block 133 and the second limiting part 222. When the opening / closing operating shaft 130 rotates to the closed position, the stop block 133 and the second limiting part 222 freely cooperate. The second limiting part on the lower door interlock plate cooperates with the stop block on the opening / closing operating shaft. When the opening / closing operating shaft is in the open position, the circuit breaker and the lower door can be locked, preventing the lower door from opening. This improves the interlocking reliability and safety of the cabinet door interlocking mechanism. The lower door interlock plate 22 is provided with a guide groove 223, and the circuit breaker operating mechanism 13 is provided with a bracket 132 that cooperates with the lower door interlock plate 22. The bracket 132 is provided with a guide rail 1321 that cooperates with the guide groove 223. The guide groove 223 is slidably disposed on the guide rail 1321, forming a sliding connection between the lower door interlock plate 22 and the bracket 132. The guide groove of the lower door interlock plate is slidably disposed on the bracket, thereby ensuring that the lower door interlock plate can reliably slide on the bracket, which is beneficial to improving the working reliability of the cabinet door interlock mechanism. The bracket 132 is provided with a guide post 133 that cooperates with the lower door interlock plate 22, and the lower door interlock plate 22 is provided with a sliding hole 224 that cooperates with the guide post 133. The guide post 133 is inserted into the sliding hole 224, forming a sliding connection between the guide post 133 and the lower door interlock plate 22. The guide columns on the bracket can guide the lower door interlock plate, ensuring its reliable operation and improving the reliability of the cabinet door interlock mechanism.

[0024] The cabinet door interlocking mechanism adopts an insert-type structure design, making the interlocking more reliable. It prevents the lower door from being opened by force, and the lower door limit group can only unlock with the interlocking rod when the lower door is fully closed. The interlocking rod then inserts into the interlocking hole of the lower door due to its own weight, preventing operation while the circuit is live. This enhances the safety of the cabinet door interlocking mechanism. Furthermore, the grounded lower door interlocking group of the cabinet door interlocking mechanism can isolate the operating mechanism from the lower door. This grounded lower door interlocking group has a simple structure, better strength, and higher interlocking reliability. When the grounded operating shaft is rotated to the open position, the grounded lower door interlocking group restricts the upward movement of the interlocking rod, ensuring that the interlocking rod reliably locks the lower door, preventing it from opening. When the grounded operating shaft is rotated to the closed position, the interlocking rod loses the limit of the grounded lower door interlocking group and can move upward, allowing the lower door to open. The lower door limit switch assembly enables reliable locking or unlocking of the lower door with the isolation operating mechanism and the circuit breaker operating mechanism. When the lower door is open, the lower door limit switch assembly restricts the interlocking rod from moving downwards. The interlocking rod can lock the tripping half-shaft through the lower door interlocking plate, preventing the circuit breaker operating mechanism from performing a tripping operation. Furthermore, after the lower door is fully closed, the lower door limit switch assembly and the interlocking rod freely engage, and the interlocking rod, due to its own weight, inserts into the interlocking hole of the lower door, achieving interlocking between the interlocking rod and the lower door. Therefore, this cabinet door interlocking mechanism has the advantages of simple structure, stable and reliable performance, convenient operation, low cost, and high safety.

Claims

1. A plug-in cabinet door interlocking mechanism for an upper-isolated, lower-circuit breaker switchgear, comprising a cabinet body, a lower door, and interlocking components, characterized in that... The interlocking assembly includes an interlocking rod that can move longitudinally and engages with the interlocking hole of the lower door; a grounded lower door interlocking group that engages with the grounding operating shaft of the isolation operating mechanism; a lower door interlocking plate that is linked to the interlocking rod and engages with the opening and closing operating shaft of the circuit breaker operating mechanism; and a lower door limiting group that is installed inside the cabinet and engages with the interlocking rod. When the grounding operating shaft and the opening and closing operating shaft are rotated to the open position, the grounded lower door interlocking group and the lower door interlocking plate restrict the interlocking rod from moving upward and can lock the interlocking rod to the lower door. The interlocking rod is provided with a limiting protrusion that engages with the lower door limiting group. When the lower door is opened, the lower door limiting group restricts the interlocking rod from moving downward, and the lower door interlocking plate moves upward with the interlocking rod and abuts against the circuit breaker operating mechanism. On the tripping half-shaft, the lower door interlocking plate can restrict the tripping half-shaft from performing the tripping action. When the lower door is closed, the lower door limit group and the limit convex ring can freely cooperate. One end of the interlocking rod is inserted into the interlocking hole of the lower door due to its own weight. The lower door limit group includes a bracket set in the cabinet, a limit plate slidably set on the bracket, and a tension spring set between the limit plate and the bracket. One end of the limit plate has a locking tongue that cooperates with the limit convex ring, and one end of the limit plate has a driving part that cooperates with the lower door. When the lower door is closed, the lower door abuts against the driving part, and the locking tongue and the limit convex ring can be freely cooperated. When the lower door is open, the locking tongue is engaged on the limit convex ring, and the locking tongue and the limit convex ring are limited to cooperate.

2. The plug-in cabinet door interlocking mechanism for the upper isolator and lower circuit breaker switchgear according to claim 1, characterized in that: The grounding door interlock assembly includes a cam linked to the grounding operating shaft and a limiting member slidably mounted on the isolation operating mechanism and cooperating with the cam. The limiting member includes a limiting rod slidably mounted on the isolation operating mechanism at the corresponding interlocking rod and a guide plate linked to the limiting rod and cooperating with the cam. The guide plate moves with the cam and can drive the limiting rod to move. The limiting rod abuts against the interlocking rod, forming a limiting engagement between the limiting rod and the interlocking rod.

3. The plug-in cabinet door interlocking mechanism for the upper isolator and lower circuit breaker switchgear according to claim 1, characterized in that: The lower door interlock plate has a first limiting part that cooperates with the tripping half shaft. The tripping half shaft is linked to a locking plate that cooperates with the first limiting part. The first limiting part moves upward with the lower door interlock plate and can abut against the locking plate, thus forming a limiting cooperation between the locking plate and the first limiting part.

4. The plug-in cabinet door interlocking mechanism for the upper isolator and lower circuit breaker switchgear according to claim 1, characterized in that: The lower door interlock plate has a second limiting part that cooperates with the opening and closing operation shaft. The opening and closing operation shaft is linked to a stop block that cooperates with the second limiting part. When the opening and closing operation shaft rotates to the opening position, the stop block moves with the opening and closing operation shaft and can abut against the second limiting part, thus forming a limiting cooperation between the stop block and the second limiting part. When the opening and closing operation shaft rotates to the closing position, the stop block and the second limiting part cooperate freely.

5. The plug-in cabinet door interlocking mechanism for the upper isolator and lower circuit breaker switchgear according to claim 1, characterized in that: The lower door interlock plate is provided with a guide groove, and the circuit breaker operating mechanism is provided with a bracket that cooperates with the lower door interlock plate. The bracket is provided with a guide rail that cooperates with the guide groove. The guide groove is slidably disposed on the guide rail and forms a sliding connection between the lower door interlock plate and the bracket.

6. The plug-in cabinet door interlocking mechanism for the upper isolator and lower circuit breaker switchgear according to claim 5, characterized in that: The bracket is provided with a guide post that cooperates with the lower door interlock plate. The lower door interlock plate is provided with a sliding hole that cooperates with the guide post. The guide post is inserted into the sliding hole and forms a sliding connection between the guide post and the lower door interlock plate.

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