Dry air insulated metal-clad switchgear protected by interlock mechanism

Abstract

The application relates to the technical field of power distribution equipment, and particularly discloses a dry air insulation metal-enclosed switchgear with a plurality of interlocking mechanisms, which comprises a sealed gas tank and a sealed cabinet door movably arranged on the front of the sealed gas tank, and two locking mounting frames are fixedly arranged on one side of the front of the sealed gas tank. The bottom of a circuit breaker, a disconnector and a grounding switch is uniformly matched with a sliding structure, and the three groups of switch components are connected with each other through an integrated linkage structure, so that the operation state of the disconnector and the grounding switch can be synchronously restricted according to the opening and closing state of the circuit breaker; when the circuit breaker is closed and works under electricity, the transmission gear structure of the disconnector can be clamped and locked, the manual adjustment action of the disconnector is limited, the control sliding part of the grounding switch is fixed in position, and the misoperation of the switch in the power distribution operation process is avoided from the physical structure.

Description

Technical Field

[0001] This invention relates to the field of power distribution equipment technology, specifically to dry air-insulated metal-enclosed switchgear protected by a multi-interlocking mechanism. Background Technology

[0002] Dry air insulated metal-enclosed switchgear is widely used in power distribution and transmission projects due to its advantages of being free of greenhouse gases, having stable insulation performance, and having low operation and maintenance costs.

[0003] Currently, most conventional dry air insulated metal-enclosed switchgear on the market uses an independently operated structure for circuit breakers, disconnectors, and grounding switches. The lack of reliable mechanical linkage between these components makes them highly susceptible to human error during operation. When the circuit breaker is closed and energized, there is a risk of staff accidentally operating the disconnector or closing the grounding switch, which can cause not only internal contact burnout and short circuits, but also serious on-site safety accidents. Furthermore, the cabinet doors of traditional switchgear are independent of the internal switch components, allowing for arbitrary opening during energized operation. This open cabinet structure compromises the sealed insulation environment inside the equipment, allowing external dust and moisture to enter, reducing the insulation capacity of the dry air and causing partial discharge, insulation breakdown, and other problems, significantly shortening the lifespan of the switchgear. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a dry air-insulated metal-enclosed switchgear with multi-interlocking mechanism protection, which is used to solve the problem that human error is very likely to occur during equipment operation, and that when the circuit breaker is in the closed and energized state, there is a risk of staff accidentally operating the isolating switch or accidentally closing the grounding switch.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dry air-insulated metal-enclosed switchgear protected by a multi-interlocking mechanism, comprising a sealed gas box and a sealed cabinet door movably disposed on the front of the sealed gas box. Two locking mounting brackets are fixedly disposed on one side of the front of the sealed gas box, and one side of each of the two locking mounting brackets extends into the interior of the sealed gas box. One side of the sealed cabinet door is rotatably connected to the interior of each of the two locking mounting brackets. A fixing bracket is fixedly disposed on one side of the interior of the sealed gas box, and a cabinet door locking part is provided on the front side of the fixing bracket. A circuit breaker, a disconnecting switch, and a grounding switch are fixedly disposed on the back of the interior of the sealed gas box, and an interlocking control mechanism is provided at the bottom of each of the circuit breaker, disconnecting switch, and grounding switch. The interlocking control mechanism includes movable brackets movably disposed inside the circuit breaker, disconnecting switch, and grounding switch, and the bottom of each movable bracket extends into the interior of the sealed gas box. A second fixing block is also fixedly disposed on the back of the interior of the sealed gas box, and a linkage bracket is slidably disposed inside the second fixing block. The bottom of each movable bracket is fixedly connected to the top of the linkage bracket.

[0006] Furthermore, the fixed frame is internally equipped with a linkage rotating rod, and a linkage control rod is also rotatably provided on one side of the back of the sealed air box, with one end of the linkage control rod fixedly connected to the rear end of the linkage rotating rod; a drive frame is fixedly provided on the front side inside the fixed frame, and a locking rotating rod is rotatably provided on the lower part of the drive frame; one end of the locking rotating rod is rotatably connected to the rear side inside the locking mounting frame, and a locking limit block is slidably provided on the front side inside the locking mounting frame, with the rear end of the locking limit block being threadedly connected to the interior of the locking rotating rod; the sealed cabinet door is also provided with a locking groove that cooperates with the locking limit block on the rotating side inside the locking mounting frame.

[0007] Furthermore, a second drive frame is fixedly installed on the rear side inside the fixed frame, and a first transmission rod is rotatably installed on the lower part of the second drive frame. One end of the first transmission rod extends into the interior of the circuit breaker, and a first cam is fixedly installed on the surface of the first transmission rod inside the circuit breaker. A first connecting rod is rotatably installed on one side of the first cam via a mounting rod. A transmission crank arm is also rotatably installed on one side of the interior of the circuit breaker via a fixed rotating shaft, and the top of the first connecting rod is rotatably connected to one side of the transmission crank arm. A limiting groove is also provided on the other side of the transmission crank arm, and a movable rod is slidably installed inside the limiting groove.

[0008] Furthermore, a fixing block is fixedly installed above the inside of the circuit breaker, and a connecting slide rod is slidably installed inside the fixing block. One side of the front of the connecting slide rod is fixedly connected to one end of the movable rod, and one side of the surface of the connecting slide rod is fixedly connected to the top of the movable frame. A circuit breaker fixed gate is fixedly installed on one side of the circuit breaker, and a circuit breaker movable gate is fixedly installed at one end of the connecting slide rod. A circuit breaker control rod is rotatably installed on one side of the back of the sealing gas box, and one end of the circuit breaker control rod is fixedly connected to one end of the transmission rod.

[0009] Furthermore, a connecting rod two is rotatably provided on one side inside the disconnecting switch, and a dynamic sealing ring is fixedly provided at one end of the connecting rod two. An insulating screw is rotatably provided on one side of the dynamic sealing ring, and a moving contact is threaded on the surface of the insulating screw. An isolating stationary contact, a stationary contact seat, and a grounding stationary contact are fixedly provided inside the disconnecting switch from left to right. An annular equalizing cover is fixedly provided on one side of the isolating stationary contact, both sides of the stationary contact seat, and one side of the grounding stationary contact. The surface of the moving contact is slidably connected to the interior of each annular equalizing cover and the isolating stationary contact, the stationary contact seat, and the grounding stationary contact.

[0010] Furthermore, a disconnect switch control rod is rotatably provided on one side of the back of the sealed gas box, and one end of the disconnect switch control rod extends into the interior of the disconnect switch. One end of the disconnect switch control rod and one end of the connecting rod 2 are both fixedly provided with meshing helical gears, and a mating gear is also fixedly provided on one side of the helical gear on the surface of the connecting rod 2. A locking limit block 2 is also slidably provided inside the disconnect switch and below the mating gear, and the top of the locking limit block 2 is provided with a locking tooth groove that mates with the teeth of the mating gear. The bottom of the locking limit block 2 is fixedly connected to the top of the movable frame.

[0011] Furthermore, a fixed grounding end is fixedly provided on one side of the grounding switch, and a movable grounding end is slidably provided on the other side of the grounding switch. A movable push block is fixedly provided on one side of the movable grounding end, and a spring is sleeved between one side of the movable push block and the inside of the grounding switch.

[0012] Furthermore, a grounding switch control rod is rotatably provided on one side of the back of the sealed gas box, and one end of the grounding switch control rod is connected to the internal thread of the grounding switch. A control wedge is also slidably provided on one side inside the grounding switch, and one side of the control wedge and one side of the movable push block are provided with mutually cooperating inclined surfaces. One end of the grounding switch control rod is rotatably connected to the back of the control wedge.

[0013] Furthermore, the top of the movable frame located inside the grounding switch is also provided with a locking plug, and one side of the control wedge is provided with a slot that cooperates with the locking plug.

[0014] The beneficial effects achieved by the present invention using the above structure are as follows: 1. By uniformly equipping the bottom of the circuit breaker, disconnector, and grounding switch with a sliding structure, and using an integrated linkage structure to connect the three sets of switch components, the operating states of the disconnector and grounding switch can be synchronously constrained based on the opening and closing state of the circuit breaker. When the circuit breaker is closed and energized, the transmission gear structure of the disconnector can be locked to restrict the manual adjustment of the disconnector. At the same time, the control sliding component of the grounding switch is limited and fixed to prevent the grounding switch from accidentally closing when the equipment is energized. This eliminates the common switch misoperation problem in power distribution operations from a physical structure perspective, effectively avoids circuit short circuits and equipment burnout, and significantly improves the safety of switchgear operation.

[0015] 2. By adding an independent cabinet door transmission locking structure inside the cabinet, the power generated by the linkage movement of the switch components drives the locking component to extend and retract, realizing the correlation constraint between the switch's energized operation state and the cabinet door's opening and closing state. When the equipment is in energized operation, the locking component can accurately engage with the cabinet door's locking position, restricting the door's rotation and opening. The cabinet door locking structure can only be released after the circuit breaker is tripped and the entire equipment is de-energized and reset. This effectively avoids the safety risks caused by opening the cabinet door when the equipment is energized, while continuously ensuring the sealed environment inside the air chamber, preventing external moisture and impurities from entering the chamber, stabilizing the dry air insulation environment inside the equipment, and ensuring the long-term stable insulation performance of the equipment. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the dry air-insulated metal-enclosed switchgear structure protected by a multi-interlocking mechanism according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the sealed gas box according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the locking rotating rod and locking mounting bracket structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the circuit breaker, disconnector, and grounding switch according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the circuit breaker according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the disconnecting switch according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the internal structure of the grounding switch according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the movable frame and control wedge structure according to an embodiment of the present invention.

[0017] In the diagram: 1. Sealed gas box; 2. Sealed cabinet door; 3. Fixing frame; 4. Cabinet door locking part; 5. Linkage control rod; 6. Circuit breaker control rod; 7. Disconnecting switch control rod; 8. Grounding switch control rod; 9. Linkage rotating rod; 10. Drive frame one; 11. Locking rotating rod; 12. Locking limit block one; 13. Locking groove; 14. Locking mounting frame; 15. Circuit breaker; 16. Disconnecting switch; 17. Grounding switch; 18. Drive frame two; 19. Transmission rod one; 20. Cam one; 21. Mounting rod; 22. Connecting rod one; 23. Transmission crank arm; 24. Fixed rotating shaft; 25. Fixing block. 1. Connecting slide bar; 26. Movable rod; 27. Limiting slide groove; 28. Circuit breaker movable switch; 39. Circuit breaker fixed switch; 30. Movable frame; 31. Connecting rod II; 32. Helical gear; 33. Matching gear; 34. Locking limit block II; 35. Dynamic sealing ring; 36. Grounding stationary contact; 37. Insulating screw; 38. Stationary contact seat; 49. Movable contact; 40. Isolating stationary contact; 41. Annular equalizing cover; 42. Grounding fixed end; 43. Grounding movable end; 44. Spring; 45. Movable push block; 46. Control wedge block; 47. Slot; 48. Fixed block II; 50. Linkage frame. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Example 1 Please see Figures 1 to 8As shown, a dry air-insulated metal-enclosed switchgear protected by a multi-interlocking mechanism includes: a sealed air chamber 1 and a sealed cabinet door 2 movably disposed on the front of the sealed air chamber 1. Two locking mounting brackets 14 are fixedly provided on one side of the front of the sealed air chamber 1, and one side of each of the two locking mounting brackets 14 extends into the interior of the sealed air chamber 1. One side of the sealed cabinet door 2 is rotatably connected to the interior of the two locking mounting brackets 14 respectively. A fixing bracket 3 is fixedly provided on one side inside the sealed air chamber 1, and a cabinet door locking part 4 is provided on the front side of the fixing bracket 3. A circuit breaker 15, a disconnecting switch 16, and a grounding switch 17 are fixedly provided on the back of the interior of the sealed air chamber 1, and an interlocking control mechanism is provided at the bottom of each of the circuit breaker 15, disconnecting switch 16, and grounding switch 17. The interlocking control mechanism is used to perform interlocking protection control on the interior of the circuit breaker 15, disconnecting switch 16, and grounding switch 17.

[0021] Specifically, the interlocking control mechanism includes movable frames 31 located inside the circuit breaker 15, disconnector 16, and grounding switch 17, with the bottom of each movable frame 31 extending into the interior of the sealed gas box 1. A second fixing block 49 is fixedly installed on the back of the sealed gas box 1, and a linkage frame 50 is slidably installed inside the second fixing block 49. The bottom of each movable frame 31 is fixedly connected to the top of the linkage frame 50. The linkage frame 50 drives each movable frame 31 to slide left and right inside the circuit breaker 15, disconnector 16, and grounding switch 17. Based on the closed state of the circuit breaker 15, the opening and closing of the disconnector 16, grounding switch 17, and sealed cabinet door 2 are interlocked for protection. When the circuit breaker 15 is closed, the disconnector 16 is in the working position and cannot be manually operated; when the grounding switch 17 is open, the sealed cabinet door 2 is locked and cannot be opened. The bottom of the circuit breaker 15, disconnector 16, and grounding switch 17 are all provided with through-slide grooves that cooperate with the movable frames 31.

[0022] It should also be noted that the switchgear in this embodiment uses the sealed gas box 1 as the overall supporting body. The sealed cabinet door 2 is rotated and movable by the locking mounting brackets 14 on both sides. The flexible opening and closing of the cabinet door and the overall sealing of the sealed gas box 1 are ensured by the embedded rotating connection structure. At the same time, the fixing bracket 3 is fixed inside the sealed gas box 1 on one side, and the cabinet door locking part 4 provides a structural basis for the interlocking of the cabinet door. The circuit breaker 15, the disconnecting switch 16 and the grounding switch 17 are integrated and fixed inside the back of the sealed gas box 1. The bottom of each of the three is provided with a movable bracket 31 with a through groove. The bottom of all the movable brackets 31 are uniformly connected to the top of the linkage bracket 50 that is slidably installed inside the fixing block 2 49, so that the movable brackets 31 of the three switches can achieve synchronous linkage sliding by relying on the linkage bracket 50. During equipment operation, the closed and open states of circuit breaker 15 serve as the core interlocking judgment benchmark. The left and right sliding of the linkage frame 50 synchronously drives the displacement of the movable frame 31 inside each switch, thereby completing the overall interlocking logic control. When circuit breaker 15 is in the closed working state, the structural linkage constraint isolating switch 16 remains in the working position and locks the manual operation function. At the same time, the forced grounding switch 17 maintains the open state and locks the opening permission of the sealed cabinet door 2. It overcomes the shortcomings of traditional switchgear where each component is independently controlled and interlocking is weak. By connecting the internal switch components of the switchgear with an integrated linkage frame 50, a closed-loop interlocking protection system with the circuit breaker 15 as the core is constructed. This system can eliminate high-risk operations such as misoperation of the isolating switch, accidental closing of the grounding switch, and opening of the cabinet door while the circuit breaker is closed from the mechanical structure level, which greatly improves the safety of equipment operation. At the same time, the through-slide design can limit the movement trajectory of the movable frame 31, ensuring the accuracy and stability of the linkage process and avoiding interlocking failure caused by mechanism jamming or deviation.

[0023] Example 2 Furthermore, the fixed frame 3 is equipped with a linkage rotating rod 9 for rotation, and a linkage control rod 5 is also provided on one side of the back of the sealed air box 1 for rotation, and one end of the linkage control rod 5 is fixedly connected to the rear end of the linkage rotating rod 9. Specifically, a drive frame 10 is fixedly installed on the front side inside the fixed frame 3, and a locking rotating rod 11 is rotatably installed on the lower part of the drive frame 10. One end of the locking rotating rod 11 and the surface of the linkage rotating rod 9 are both provided with transmission wheels, and the two transmission wheels are connected by a synchronous belt. One end of the locking rotating rod 11 is rotatably connected to the rear side inside the locking mounting frame 14. A locking limit block 12 is slidably installed on the front side inside the locking mounting frame 14, and the rear end of the locking limit block 12 is threadedly connected to the inside of the locking rotating rod 11. The side of the sealed cabinet door 2 located inside the locking mounting frame 14 that rotates is also provided with a locking groove 13 that cooperates with the locking limit block 12. After one end of the locking limit block 12 is inserted into the inside of the locking groove 13, the side of the sealed cabinet door 2 located inside the locking mounting frame 14 is locked and cannot rotate.

[0024] The locking limit block 12 has an octagonal prism shape at the front end and a cylindrical shape at the rear end. The rear end surface of the locking limit block 12 is also provided with external threads. By rotating the locking rotating rod 11 in both directions, the locking limit block 12 slides back and forth inside the locking mounting bracket 14, thereby realizing the connection and disconnection between the locking limit block 12 and the locking groove 13. According to the rotation state of the linkage rotating rod 9, the locking control of the sealed cabinet door 2 is interlocked with the operation of the circuit breaker 15, the isolating switch 16 and the grounding switch 17 for protection control.

[0025] Furthermore, a second drive frame 18 is fixedly installed on the rear side inside the fixed frame 3, and a first transmission rod 19 is rotatably installed on the lower part inside the second drive frame 18. One end of the first transmission rod 19 and the surface of the linkage rotating rod 9 are both provided with transmission wheels, and the two transmission wheels are connected by a synchronous belt drive.

[0026] Specifically, one end of the transmission rod 19 extends into the interior of the circuit breaker 15, and a cam 20 is fixedly mounted on the surface of the transmission rod 19 inside the circuit breaker 15. A connecting rod 22 is rotatably mounted on one side of the cam 20 via a mounting rod 21. A transmission crank arm 23 is also rotatably mounted on one side of the interior of the circuit breaker 15 via a fixed rotating shaft 24, and the top of the connecting rod 22 is rotatably connected to one side of the transmission crank arm 23. A limiting groove 28 is also provided on the other side of the transmission crank arm 23, and a movable rod 27 is slidably mounted inside the limiting groove 28. A fixing block 25 is also fixedly mounted on the upper part of the interior of the circuit breaker 15, and a connecting slide rod 26 is slidably mounted inside the fixing block 25. One side of the front of the connecting slide rod 26 is fixedly connected to one end of the movable rod 27, and one side of the surface of the connecting slide rod 26 is fixedly connected to the top of the movable frame 31. A circuit breaker fixed gate 30 is fixedly provided on one side of the circuit breaker 15, and a circuit breaker movable gate 29 is fixedly provided at one end of the connecting slide rod 26. The transmission rod 19 is rotated by the linkage rotating rod 9 in conjunction with the synchronous belt. Then, the transmission crank arm 23 is rotated around the fixed rotating shaft 24 by the cam 20 and the connecting rod 22. The connecting slide rod 26 is slid to the right by the other side of the transmission crank arm 23 in conjunction with the movable rod 27, so that the circuit breaker movable gate 29 on one side of the connecting slide rod 26 and the circuit breaker fixed gate 30 on one side can perform a closing operation.

[0027] Furthermore, a circuit breaker control rod 6 is rotatably provided on one side of the back of the sealed gas box 1, and one end of the circuit breaker control rod 6 is fixedly connected to one end of the transmission rod 19; the closing and opening operations between the circuit breaker movable gate 29 and the circuit breaker fixed gate 30 are manually controlled by the circuit breaker control rod 6.

[0028] Specifically, a connecting rod 32 is rotatably mounted on one side of the interior of the disconnecting switch 16, and a dynamic sealing ring 36 is fixedly mounted on one end of the connecting rod 32. An insulating screw 38 is rotatably mounted on one side of the dynamic sealing ring 36, and a moving contact 40 is threaded onto the surface of the insulating screw 38. From left to right, the interior of the disconnecting switch 16 is fixedly mounted with an isolating stationary contact 41, a stationary contact seat 39, and a grounding stationary contact 37. An annular pressure equalizing cover 42 is fixedly mounted on one side of the isolating stationary contact 41, both sides of the stationary contact seat 39, and one side of the grounding stationary contact 37. The surface of the moving contact 40 is slidably connected to the interior of each annular pressure equalizing cover 42 and the isolating stationary contact 41, the stationary contact seat 39, and the grounding stationary contact 37. The insulating screw 38 is rotated forward and backward by the connecting rod 32, allowing the moving contact 40 to slide left and right inside the stationary contact seat 39, thereby achieving the switching operation of the working state of the disconnecting switch 16.

[0029] Furthermore, a disconnect switch control rod 7 is rotatably provided on one side of the back of the sealed gas box 1, and one end of the disconnect switch control rod 7 extends into the interior of the disconnect switch 16. One end of the disconnect switch control rod 7 and one end of the connecting rod 2 32 are both fixedly provided with meshing helical gears 33, and a mating gear 34 is also fixedly provided on one side of the helical gear 33 on the surface of the connecting rod 2 32. A locking limit block 2 35 is also slidably provided inside the disconnect switch 16 and below the mating gear 34, and the top of the locking limit block 2 35 is provided with a locking tooth groove that meshes with the teeth of the mating gear 34. The bottom of the locking limit block 2 35 is fixedly connected to the top of the movable frame 31.

[0030] It should be noted that during use, the position of the moving contact 40 inside the disconnect switch 16 is controlled by the disconnect switch control lever 7 in conjunction with two meshing helical gears 33.

[0031] Specifically, a fixed grounding end 43 is fixedly provided on one side of the grounding switch 17, and a movable grounding end 44 is slidably provided on the other side of the grounding switch 17. A movable push block 46 is fixedly provided on one side of the movable push block 46, and a spring 45 is sleeved between one side of the movable push block 46 and the interior of the grounding switch 17. A grounding switch control rod 8 is rotatably provided on one side of the back of the sealing gas box 1, and one end of the grounding switch control rod 8 is threadedly connected to the interior of the grounding switch 17. A control wedge 47 is slidably provided on one side of the interior of the grounding switch 17, and one side of the control wedge 47 and one side of the movable push block 46 are provided with mutually cooperating inclined surfaces. One end of the grounding switch control rod 8 is rotatably connected to the back of the control wedge 47.

[0032] It should be noted that during use, the grounding switch control rod 8 is rotated. Utilizing the threaded engagement between the grounding switch control rod 8 and the grounding switch 17, as the grounding switch control rod 8 rotates, one end of the grounding switch control rod 8 moves inward into the grounding switch 17. This pushes the control wedge 47 towards one side of the movable push block 46. Utilizing the inclined surfaces of the control wedge 47 and the movable push block 46, one side of the movable push block 46 is pushed towards the grounding fixed end 43 until the grounding movable end 44 and the grounding fixed end 43 are connected, thus completing the manual grounding control of the grounding inside the grounding switch 17.

[0033] Furthermore, a locking block is provided at the top of the movable frame 31 located inside the grounding switch 17, and a slot 48 that cooperates with the locking block is provided on one side of the control wedge 47; the movable frame 31 drives the locking block to be inserted into the slot 48, thereby locking the operation of the control wedge 47.

[0034] It should also be noted that by adding a multi-stage transmission and independent locking interlocking structure on the basic structure, the fixed frame 3 inside the sealed air box 1 forms the basic transmission hub through the linkage rotating rod 9 and the linkage control rod 5. The drive frame 10 on the front side of the fixed frame 3 is equipped with the locking rotating rod 11. The locking rotating rod 11 and the linkage rotating rod 9 achieve power transmission through the transmission wheel and the synchronous belt. The locking rotating rod 11 is threadedly connected to the locking limit block 12 that is slidably installed inside the locking mounting frame 14. Relying on the irregular structure of the locking limit block 12 with an octagonal prism at the front end and a cylindrical external thread at the rear end, it is ensured that only axial sliding and no radial rotation occur during the threaded transmission, so that the locking limit block 12 can accurately extend and retract back and forth. By embedding or disengaging from the locking groove 13 on the side of the sealed cabinet door 2, the mechanical locking and unlocking of the sealed cabinet door 2 is realized, so that the opening and closing state of the cabinet door and the operating state of the three major switches form a mechanical interlock. Meanwhile, the transmission rod 19 inside the drive frame 2 18 on the rear side of the fixed frame 3 is also connected to the linkage rotating rod 9 via a synchronous belt. The cam 20 at the end of the transmission rod 19, together with the mounting rod 21 and the connecting rod 22, connects to the transmission crank arm 23 inside the circuit breaker 15. The transmission crank arm 23 is connected to the sliding connecting rod 26 inside the fixed block 25 via the limiting slide groove 28 and the movable rod 27. The connecting rod 26 is respectively connected to the movable frame 31 and the movable circuit breaker 29. The circuit breaker control rod 6 can manually drive the transmission rod 19 to rotate. Through the entire cam crank arm transmission structure, the movable circuit breaker 29 and the fixed circuit breaker 30 are driven to complete the closing and opening actions, realizing the manual control of the circuit breaker while integrating the circuit breaker operation into the overall interlocking mechanism.

[0035] In the structure of the disconnector switch 16, the disconnector switch control rod 7 drives the connecting rod 32 and the insulating screw 38 to rotate through the meshing helical gear 33, which drives the threaded moving contact 40 to slide left and right inside the stationary contact seat 39, switching the working state of the disconnector switch. The matching gear 34 of the connecting rod 32 is matched with the locking limit block 35 on the top of the movable frame 31. It can lock the rotation of the matching gear 34 after the circuit breaker 15 is closed, thus restricting the manual operation of the disconnector switch 16. The grounding switch 17 has an internal opening and closing structure consisting of a fixed grounding end 43 and a sliding grounding movable end 44. The grounding switch control rod 8 drives the control wedge 47 to move through a threaded transmission. The control wedge 47 and the movable push block 46 work together to compress the inclined surface of the spring 45, pushing the grounding movable end 44 to complete the grounding closing. At the same time, the locking plug at the top of the movable frame 31 inside the grounding switch 17 can be inserted into the slot 48 of the control wedge 47 to lock the grounding switch operation structure when the circuit breaker is closed. In addition, the annular equalizing cover 42 that matches each contact assembly inside the disconnecting switch 16 can even out the electric field inside the equipment and reduce the probability of partial discharge.

[0036] In use, a combination of multi-stage synchronous belt drive, cam crank arm drive, and gear meshing drive is adopted to achieve all-round mechanical hard interlocking of circuit breaker 15, disconnector switch 16, grounding switch 17, and sealed cabinet door 2. Compared with the traditional single interlocking structure, the interlocking coverage is wider and the fault tolerance rate is lower, completely avoiding the safety hazards caused by electrical interlocking failure. The irregular structure design of the locking limit block 12 improves the stability and accuracy of the cabinet door locking, avoiding the cabinet door from being opened accidentally due to the loosening of the locking structure. The independently set circuit breaker control rod 6, disconnector switch control rod 7, and grounding switch control rod 8 enable independent manual operation of each switch, taking into account both the convenience of equipment operation and the safety of interlocking. The inclined plane drive and spring 45 buffer structure make the opening and closing action of the grounding switch smoother. The annular equalizing cover 42 effectively optimizes the internal insulation environment of the equipment, improves the stability of the dry air insulation structure, and extends the service life of the equipment. The overall structure achieves multiple technical improvements such as controllable operation, fault prevention, and stable operation, and is suitable for the complex operating conditions of high-voltage switchgear.

[0037] Example 3 Specifically, this embodiment also discloses a method for operating a dry air-insulated metal-enclosed switchgear protected by a multi-interlocking mechanism, including the following steps: Step 1: The operator rotates the circuit breaker control lever 6, causing the transmission lever 19 to rotate synchronously. The cam 20 at the end of the transmission lever 19 rotates accordingly, pushing and pulling the transmission crank arm 23 through the mounting rod 21 and the connecting rod 22, causing the transmission crank arm 23 to rotate and swing around the fixed shaft 24. In the swinging state, the transmission crank arm 23 drives the movable rod 27 to move through its own limiting slide groove 28. The movable rod 27 pulls the connecting slide rod 26 inside the fixed block 25 to slide laterally. The connecting slide rod 26 synchronously drives the movable frame 31 connected at the top and the movable circuit breaker gate 29 at the end to move, so that the movable circuit breaker gate 29 and the fixed circuit breaker gate 30 are in contact to complete the circuit breaker 15 closing operation. After the circuit breaker 15 is closed, the corresponding movable frame 31 moves with the connecting slide rod 26. The displacement force is synchronously transmitted to the movable frame 31 at the bottom of the disconnecting switch 16 and the grounding switch 17 through the linkage frame 50, realizing the synchronous linkage sliding of the three sets of movable frames 31.

[0038] Step 2: After the movable frame 31 at the bottom of the disconnect switch 16 slides, it drives the top locking limit block 35 to rise, so that the locking groove of the locking limit block 35 engages with the gear 34, restricting the rotational movement of the gear 34 and the helical gear 33, locking the manual operation function of the disconnect switch control lever 7, and keeping the disconnect switch 16 stably in the working position.

[0039] Step 3: After the movable frame 31 at the bottom of the grounding switch 17 slides, it drives the top locking block to move, so that the locking block is embedded in the slot 48 on the side of the control wedge 47, locking the horizontal sliding stroke of the control wedge 47, restricting the rotation operation of the grounding switch control rod 8, so that the grounding switch 17 remains in the open state, and preventing the problem of accidental grounding closure.

[0040] Step 4: During the linkage process of the linkage frame 50, the linkage rotating rod 9 is driven to rotate synchronously. The linkage rotating rod 9 drives the locking rotating rod 11 to rotate through the synchronous belt and the transmission wheel. The locking rotating rod 11 pushes the locking limit block 12 forward by the threaded structure, so that the front end of the locking limit block 12 is inserted into the locking groove 13 on the side of the sealed cabinet door 2, locking the rotational freedom of the sealed cabinet door 2 and realizing the cabinet door locking protection under the power state.

[0041] Step 5: When the equipment needs to be de-energized for maintenance, rotate the circuit breaker control lever 6 in reverse. Through the multi-stage transmission structure, the movable circuit breaker 29 is separated from the fixed circuit breaker 30, completing the circuit breaker 15 tripping operation and unlocking the overall interlocking structure. After the circuit breaker 15 trips, the linkage frame 50 resets, causing all movable frames 31 to return to their initial positions. The locking limit block 35 disengages from the engaging gear 34, and the locking insert disengages from the slot 48 of the control wedge block 47, respectively releasing the operation locks of the isolating switch 16 and the grounding switch 17. At the same time, the locking rotating lever 11 rotates in reverse. Pull the locking limit block 12 out of the locking groove 13 to unlock the sealed cabinet door 2; after the cabinet door is unlocked, the sealed cabinet door 2 can be rotated to open. The staff can rotate the isolating switch control rod 7, which drives the connecting rod 32 and the insulating screw 38 to rotate by relying on the helical gear 33, and drive the moving contact 40 to slide inside the stationary contact seat 39 to switch the working state of the isolating switch 16. Alternatively, the grounding switch control rod 8 can be rotated to push the control wedge 47 to squeeze the movable push block 46 and the spring 45, so that the grounding movable end 44 and the grounding fixed end 43 are in contact to complete the grounding closing maintenance operation.

[0042] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dry air-insulated metal-enclosed switchgear protected by a multi-interlocking mechanism, comprising a sealed air chamber (1) and a sealed cabinet door (2) movably disposed on the front of the sealed air chamber (1), wherein two locking mounting brackets (14) are fixedly provided on one side of the front of the sealed air chamber (1), and one side of each of the two locking mounting brackets (14) extends into the interior of the sealed air chamber (1), and one side of the sealed cabinet door (2) is rotatably connected to the interior of each of the two locking mounting brackets (14), characterized in that, A fixed frame (3) is fixedly provided on one side inside the sealed gas box (1), and a cabinet door locking part (4) is provided on the front side of the fixed frame (3); a circuit breaker (15), a disconnecting switch (16) and a grounding switch (17) are fixedly provided on the back side inside the sealed gas box (1), and an interlocking control mechanism is provided at the bottom of the circuit breaker (15), the disconnecting switch (16) and the grounding switch (17); the interlocking control mechanism includes a movable frame (31) that is movably installed inside the circuit breaker (15), the disconnecting switch (16) and the grounding switch (17), and the bottom of the movable frame (31) extends into the interior of the sealed gas box (1). A second fixed block (49) is also fixedly provided on the back side inside the sealed gas box (1), and a linkage frame (50) is slidably provided inside the second fixed block (49). The bottom of each movable frame (31) is fixedly connected to the top of the linkage frame (50).

2. The dry air-insulated metal-enclosed switchgear with multi-interlocking mechanism protection according to claim 1, characterized in that, The fixed frame (3) is provided with a linkage rotating rod (9) inside, and a linkage control rod (5) is also provided on one side of the back of the sealed air box (1). One end of the linkage control rod (5) is fixedly connected to the rear end of the linkage rotating rod (9). A drive frame (10) is fixedly provided on the front side inside the fixed frame (3), and a locking rotating rod (11) is provided on the lower side inside the drive frame (10). One end of the locking rotating rod (11) is rotatably connected to the rear side inside the locking mounting frame (14). A locking limit block (12) is slidably provided on the front side inside the locking mounting frame (14), and the rear end of the locking limit block (12) is threadedly connected to the inside of the locking rotating rod (11). The sealed cabinet door (2) is located on the rotating side inside the locking mounting frame (14) and is provided with a locking groove (13) that cooperates with the locking limit block (12).

3. The dry air-insulated metal-enclosed switchgear with multi-interlocking mechanism protection according to claim 1, characterized in that, The rear side inside the fixed frame (3) is also fixedly provided with a second drive frame (18), and a transmission rod (19) is rotatably provided at the bottom inside the second drive frame (18); one end of the transmission rod (19) extends into the inside of the circuit breaker (15), and a cam (20) is fixedly provided on the surface of the transmission rod (19) inside the circuit breaker (15), and a connecting rod (22) is rotatably provided on one side of the cam (20) through the mounting rod (21); a transmission crank arm (23) is rotatably provided on one side inside the circuit breaker (15) through a fixed rotating shaft (24), and the top of the connecting rod (22) is rotatably connected to one side of the transmission crank arm (23), and a limiting groove (28) is provided on the other side of the transmission crank arm (23), and a movable rod (27) is slidably provided inside the limiting groove (28).

4. The dry air-insulated metal-enclosed switchgear with multi-interlocking mechanism protection according to claim 3, characterized in that, A fixing block (25) is fixedly installed on the upper part of the circuit breaker (15), and a connecting slide rod (26) is slidably installed inside the fixing block (25). One side of the front of the connecting slide rod (26) is fixedly connected to one end of the movable rod (27), and one side of the surface of the connecting slide rod (26) is fixedly connected to the top of the movable frame (31). A circuit breaker fixing gate (30) is fixedly installed on one side of the circuit breaker (15), and a circuit breaker movable gate (29) is fixedly installed at one end of the connecting slide rod (26). A circuit breaker control rod (6) is rotatably installed on one side of the back of the sealing gas box (1), and one end of the circuit breaker control rod (6) is fixedly connected to one end of the transmission rod (19).

5. The dry air-insulated metal-enclosed switchgear with multi-interlocking mechanism protection according to claim 1, characterized in that, The disconnector switch (16) has a connecting rod 2 (32) rotatably mounted on one side inside, and a dynamic sealing ring (36) is fixedly mounted on one end of the connecting rod 2 (32). An insulating screw (38) is rotatably mounted on one side of the dynamic sealing ring (36), and a moving contact (40) is threaded on the surface of the insulating screw (38). The disconnector switch (16) has a stationary isolation contact (41), a stationary contact seat (39), and a grounding stationary contact (37) fixedly mounted from left to right inside. An annular equalizing cover (42) is fixedly mounted on one side of the stationary isolation contact (41), both sides of the stationary contact seat (39), and one side of the grounding stationary contact (37). The surface of the moving contact (40) is slidably connected to the interior of each annular equalizing cover (42) and the stationary isolation contact (41), stationary contact seat (39), and grounding stationary contact (37).

6. The dry air-insulated metal-enclosed switchgear with multi-interlocking mechanism protection according to claim 5, characterized in that, The sealing gas box (1) has a rotatable isolating switch control rod (7) on one side of its back, and one end of the isolating switch control rod (7) extends into the interior of the isolating switch (16). One end of the isolating switch control rod (7) and one end of the connecting rod (2) are fixedly provided with helical gears (33) that mesh with each other. A matching gear (34) is also fixedly provided on one side of the helical gear (33) on the surface of the connecting rod (2) (32). A locking limit block (2) (35) is also slidably provided inside the isolating switch (16) and below the matching gear (34). The top of the locking limit block (2) (35) is provided with a locking tooth groove that meshes with the teeth of the matching gear (34). The bottom of the locking limit block (2) (35) is fixedly connected to the top of the movable frame (31).

7. The dry air-insulated metal-enclosed switchgear with multi-interlocking mechanism protection according to claim 1, characterized in that, The grounding switch (17) has a fixed grounding end (43) on one side inside, and a movable grounding end (44) is slidably provided on the other side inside the grounding switch (17). A movable push block (46) is fixedly provided on one side of the movable push block (46), and a spring (45) is sleeved between one side of the movable push block (46) and the inside of the grounding switch (17).

8. The dry air-insulated metal-enclosed switchgear with multi-interlocking mechanism protection according to claim 1, characterized in that, The sealing gas box (1) has a grounding switch control rod (8) rotatably mounted on one side of its back side. One end of the grounding switch control rod (8) is threadedly connected to the inside of the grounding switch (17). A control wedge (47) is also slidably mounted on one side of the inside of the grounding switch (17). One side of the control wedge (47) and one side of the movable push block (46) are provided with mutually cooperating inclined surfaces. One end of the grounding switch control rod (8) is rotatably connected to the back of the control wedge (47).

9. The dry air-insulated metal-enclosed switchgear with multi-interlocking mechanism protection according to claim 8, characterized in that, The top of the movable frame (31) located inside the grounding switch (17) is also provided with a locking plug, and a slot (48) that cooperates with the locking plug is provided on one side of the control wedge (47).

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