A circuit breaker with closing protection mechanism

Abstract

This invention discloses a circuit breaker with a closing protection mechanism, specifically relating to the field of circuit breaker technology. It includes a housing, inside which are arranged contact assemblies, short-circuit protection assemblies, overload protection assemblies, and a lever assembly. It also includes a closing protection mechanism and a trigger assembly. Through the arrangement of the closing protection mechanism and trigger assembly, this invention, after a short-circuit fault trips, fixes the drive plate on the reset path of the lever assembly, preventing closing operations without clearing the fault. This eliminates the risk of closing with a fault due to behavioral inertia or misjudgment. Mechanically, it ensures a safe operating sequence of maintenance before closing. Furthermore, after maintenance, simply pressing the switch resets the limit slider and drive plate, removing the obstruction. This avoids the risk of secondary contact erosion and equipment damage caused by closing with a fault, while ensuring convenient unlocking after maintenance, thus balancing safety protection and maintenance efficiency.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more specifically, to a circuit breaker with a closing protection mechanism. Background Technology

[0002] Circuit breakers are core protective electrical appliances in low-voltage power distribution systems, ensuring the safe and stable operation of circuits. They integrate circuit switching control with overload and short-circuit fault protection functions. In single-phase power distribution systems, circuit breakers can be classified into 1P (single-pole), 1P+N (single-pole with neutral), and 2P (two-pole) types, depending on the number of poles controlled. Among them, 2P circuit breakers are widely used in household main incoming switches, socket circuits, and terminal power distribution protection for single-phase high-power electrical equipment because they can simultaneously control and protect both the live and neutral wires, achieving synchronous disconnection of both poles upon tripping, thus avoiding the safety hazards caused by a live neutral wire.

[0003] When a circuit breaker trips due to a serious fault such as a short circuit or overload, operators often instinctively push the handle to attempt to re-energize it without first identifying and eliminating the fault. This blind "re-closing with a fault" behavior causes the moving and stationary contacts to be subjected to a huge short-circuit current surge again at the moment of closure, generating a strong electric arc. This not only causes severe contact erosion and significantly shortens the overall service life of the circuit breaker, but also easily leads to the burning of internal components, equipment fire, or even explosion, posing an extremely serious and direct threat to the personal safety of on-site operators.

[0004] This invention provides a circuit breaker with a closing protection mechanism, which aims to solve the problem that forcibly closing the circuit with a fault will cause a strong electric arc due to the impact of short-circuit current, which will severely burn the contacts, damage the equipment, and endanger personal safety. Summary of the Invention

[0005] The purpose of this invention is to provide a circuit breaker with a closing protection mechanism to solve the problem mentioned in the background art that forced closing with a fault will cause a strong electric arc due to the impact of short-circuit current, which will seriously burn the contacts, damage the equipment and endanger personal safety.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a circuit breaker with a closing protection mechanism, comprising a housing, wherein a contact assembly, a short-circuit protection assembly, an overload protection assembly, and a lever assembly are disposed inside the housing, and further comprising: The closing protection mechanism is disposed inside the housing and located on the reset path of the lever assembly. It is used to trigger and lock in the blocking position when the short circuit protection component or the overload protection component trips, so as to prevent the lever assembly from performing the closing operation. A trigger component, disposed on the closing protection mechanism, is used to release the locked state of the closing protection mechanism during manual operation, so as to reset the closing protection mechanism from the blocking position.

[0007] Preferably, the closing protection mechanism includes a limiting slider and a drive plate. A first limiting member is fixedly connected to the inner wall of the housing. The limiting slider is slidably connected within the first limiting member. The drive plate is fixedly connected to the end of the limiting slider near the short-circuit protection component via a connecting member. The drive plate is used to receive the driving force of the short-circuit protection component and drive the limiting slider to slide.

[0008] Preferably, the closing protection mechanism further includes a trigger rod, which is perpendicular to the limiting slider. A second limiting member is fixedly connected to the inner wall of the housing. The trigger rod is slidably connected within the second limiting member. A support block is fixedly connected to the trigger rod below the second limiting member. A first elastic member is connected between the second limiting member and the support block. The first elastic member is used to drive the trigger rod to reset.

[0009] Preferably, the closing protection mechanism further includes an angle lever and a support column. A hinge seat is fixedly connected inside the housing. The angle lever is rotatably connected to the hinge seat. One end of the support column is connected to the limiting slider via a support rod. One end of the angle lever is rotatably connected to the support column via a first pin. The other end of the angle lever is rotatably connected to the trigger rod via a second pin. The angle lever is used to convert the sliding of the limiting slider into the axial movement of the trigger rod.

[0010] Preferably, a limiting groove is provided at the end of the limiting slider away from the short-circuit protection component, and the support rod is slidably connected in the limiting groove.

[0011] Preferably, the triggering component includes a switch and a first limiting block. A pressing groove is provided at one end of the trigger rod extending outside the housing. The switch is slidably connected in the pressing groove. A first telescopic groove communicating with the pressing groove is provided on one side of the trigger rod. The first limiting block is slidably connected in the first telescopic groove. The first limiting block is used to extend out of the first telescopic groove and lock onto the outer wall of the housing when the trigger rod extends out of the housing.

[0012] Preferably, the triggering component further includes a second limiting block. The trigger rod has a second telescopic groove on the side away from the first telescopic groove that communicates with the pressing groove. The second limiting block is slidably connected in the second telescopic groove. The second limiting block is used to extend out of the second telescopic groove and lock onto the outer wall of the housing when the trigger rod extends to a greater stroke due to the overload protection component tripping.

[0013] Preferably, the closing protection mechanism further includes a connecting rod, the overload protection component includes a bimetallic strip, the end of the bimetallic strip is provided with a limit hook, one end of the connecting rod is rotatably connected to the support column, and the other end is connected to the limit hook. The connecting rod is used to transmit the deformation displacement of the bimetallic strip to the support column to drive the trigger rod to move.

[0014] Preferably, a first guide rod is fixedly connected to one end of the first limiting block located inside the pressing groove, and a second guide rod is fixedly connected to one end of the second limiting block located inside the pressing groove. A first guide groove that cooperates with the first guide rod and a second guide groove that cooperates with the second guide rod are provided on one side of the switch. The first guide groove and the second guide groove are used to drive the first guide rod and the second guide rod to move respectively when the switch is pressed, so that the first limiting block and the second limiting block retract into the corresponding telescopic groove.

[0015] Preferably, the switch has an installation groove at one end inside the pressing groove, and a second elastic element is sleeved inside the installation groove. One end of the second elastic element is connected to the inner wall of the installation groove, and the other end is connected to the inner wall of the pressing groove.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention, through the setting of the closing protection mechanism and triggering component, after the short-circuit fault trips, through the linkage of the drive plate, the angle lever and the trigger rod, causes the first limit block to extend out of the outer wall of the housing and lock, fixing the drive plate on the reset path of the lever assembly, preventing the closing operation when the fault has not been eliminated, eliminating the risk of closing with a fault due to behavioral inertia or misjudgment, and ensuring the safe operation sequence of maintenance before closing from a mechanical structure point of view. At the same time, after maintenance is completed, only the switch needs to be pressed, the first limit block is retracted through the first guide rod, and the energy stored in the first elastic element is released, which can reset the limit slider and the drive plate to release the obstruction, thereby avoiding the risk of secondary contact burning and equipment damage caused by closing with a fault, while ensuring convenient unlocking after maintenance, taking into account both safety protection and maintenance efficiency; 2. This invention, through the design of limiting hooks and connecting rods, allows the trigger rod to be pushed to a higher position during overload faults. Combined with the second limiting block and second telescopic groove added to the trigger assembly, it achieves closing interlocking under both overload and short-circuit conditions. Simultaneously, during overload, both the first and second limiting blocks extend; during short circuit, only the first limiting block extends. Maintenance personnel can directly observe the length of the trigger rod extending from the housing and the number of limiting blocks to distinguish the fault type, eliminating the need for instruments to troubleshoot individually. After maintenance, pressing the switch simultaneously retracts both limiting blocks and completes the reset. This integrates fault type identification into mechanical interlocking protection, reducing fault troubleshooting time and maintenance resource mismatch, and lowering maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention.

[0019] Figure 3 This is a schematic diagram showing the location of the closing protection mechanism of the present invention.

[0020] Figure 4 This is a schematic diagram of the closing protection mechanism of the present invention.

[0021] Figure 5 This is an exploded view of the closing protection mechanism of the present invention.

[0022] Figure 6 This is a partial cross-sectional view of the limiting groove and support rod of the present invention.

[0023] Figure 7 This is a schematic diagram of the angle lever portion of the present invention.

[0024] Figure 8 This is a schematic diagram of the trigger rod part of the present invention.

[0025] Figure 9 This is a cross-sectional view of the internal structure of the pressing groove of the present invention.

[0026] Figure 10 This is an exploded view of the switch portion of the present invention.

[0027] Figure 11 This is a schematic diagram of the short-circuit state structure of the present invention.

[0028] Figure 12 This is a schematic diagram of the overload state structure of the present invention.

[0029] The attached figures are labeled as follows: 1. Housing; 11. Contact assembly; 12. Short-circuit protection assembly; 13. Overload protection assembly; 131. Bimetallic strip; 14. Lever assembly; 2. Closing protection mechanism; 21. Limiting slider; 22. Drive plate; 23. First limiting member; 24. Connecting member; 25. Trigger rod; 26. Second limiting member; 27. Support block; 28. Telescopic rod; 29. ​​Guide hole; 210. First elastic element; 211. Limiting groove; 212. Support rod; 213. Support column; 214. Hinge seat; 215. 216. Angle lever; 217. First pin; 218. Second pin; 219. Connecting rod; 220. Connecting hole; 3. Limiting hook; 31. Trigger assembly; 32. Switch; 33. First limiting block; 34. Pressing groove; 35. First telescopic groove; 36. First wedge surface; 37. First guide rod; 38. First guide groove; 39. Mounting groove; 30. Second elastic element; 311. Second limiting block; 312. Second telescopic groove; 313. Second wedge surface; 314. Second guide rod; 315. Second guide groove. Detailed Implementation

[0030] 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.

[0031] Example 1 refer to Figures 1 to 12 According to an embodiment of the present invention, a circuit breaker with a closing protection mechanism includes a housing 1, and a contact assembly 11, a short-circuit protection assembly 12, an overload protection assembly 13, and a lever assembly 14 are disposed inside the housing 1.

[0032] refer to Figure 2 The short-circuit protection component 12 includes a trip unit fixed inside the housing 1. When the circuit is working normally, the electromagnetic force is insufficient to drive the trip unit to operate. When a short-circuit fault occurs in the circuit, the current inside the trip unit increases sharply, generating a strong induced magnetic field, which causes the trip unit to push the traction rod, causing the circuit breaker to trip and the moving contact to separate from the stationary contact, thereby cutting off the faulty circuit.

[0033] refer to Figure 2 The overload protection component 13 includes a bimetallic strip 131 connected to the main circuit of the circuit breaker. When a continuous overload current occurs in the circuit, the bimetallic strip 131 bends and deforms due to heat. When the deformation of the bimetallic strip 131 reaches a predetermined threshold, the trigger pushes the traction rod or tripping element to trigger the circuit breaker to trip, thereby achieving overload protection.

[0034] refer to Figures 2 to 4 It also includes a closing protection mechanism 2, which is installed inside the housing 1 and located on the reset path of the lever assembly 14. The closing protection mechanism 2 includes a limit slider 21 and a drive plate 22. A first limit member 23 is fixedly connected to the inner wall of the housing 1. The limit slider 21 is slidably connected inside the first limit member 23. The drive plate 22 is fixedly connected to the end of the limit slider 21 near the short circuit protection assembly 12 through a connector 24.

[0035] refer to Figure 3 , Figure 8 and Figure 11 The closing protection mechanism 2 also includes a trigger rod 25, which is perpendicular to the limiting slider 21. A second limiting member 26 is fixedly connected to the inner wall of the housing 1. The trigger rod 25 is slidably connected inside the second limiting member 26. A support block 27 is fixedly connected to the trigger rod 25 below the second limiting member 26. A telescopic rod 28 is fixedly connected to the bottom of the second limiting member 26. A guide hole 29 corresponding to the position of the telescopic rod 28 is opened on the support block 27. The telescopic rod 28 is slidably connected inside the guide hole 29. A first elastic member 210 sleeved on the telescopic rod 28 is connected between the second limiting member 26 and the support block 27.

[0036] refer to Figure 4 and Figure 6 The limiting slider 21 has a limiting groove 211 at one end away from the short circuit protection component 12. A support rod 212 is slidably connected in the limiting groove 211. The end of the support rod 212 away from the limiting slider 21 extends to the outside of the limiting groove 211 and is fixedly connected to a support column 213.

[0037] refer to Figures 4 to 7 The housing 1 has a hinge seat 214 fixedly connected inside, which is disposed between the trigger rod 25 and the support column 213. An angle lever 215 is rotatably connected to the hinge seat 214. The angle lever 215 includes a first cantilever and a second cantilever, which form a fixed angle. The end of the support column 213 away from the support rod 212 is rotatably connected to a first pin 216. The end of the trigger rod 25 located inside the housing 1 is rotatably connected to a second pin 217. The support column 213 and the angle lever 215 are rotatably connected through the first pin 216, and the trigger rod 25 and the angle lever 215 are rotatably connected through the second pin 217. The first cantilever and the second cantilever of the angle lever 215 slide on the first pin 216 and the second pin 217, respectively.

[0038] refer to Figure 1 , Figure 9 and Figure 10It also includes a trigger component 3, which is disposed inside the trigger rod 25 and includes a switch 31 and a first limiting block 32. One end of the trigger rod 25 extending to the outside of the housing 1 is provided with a pressing groove 33. The switch 31 is slidably connected in the pressing groove 33. One side of the trigger rod 25 is provided with a first telescopic groove 34 communicating with the inside of the pressing groove 33. The first limiting block 32 is slidably connected in the first telescopic groove 34. One end of the first limiting block 32 located outside the pressing groove 33 is provided with a first wedge-shaped surface 35.

[0039] refer to Figure 9 and Figure 10 The first limiting block 32 is fixedly connected to the first guide rod 36 at one end inside the pressing groove 33. The first guide groove 37 is opened on one side of the switch 31, and the first guide rod 36 is slidably connected in the first guide groove 37.

[0040] refer to Figure 9 The switch 31 has an installation groove 38 at one end inside the pressing groove 33. A second elastic member 39 is sleeved inside the installation groove 38. One end of the second elastic member 39 is connected to the inner wall of the installation groove 38, and the other end is connected to the inner wall of the pressing groove 33.

[0041] When the switch 31 moves toward the inside of the pressing groove 33 to compress the second elastic element 39, the first guide groove 37 cooperates with the first guide rod 36 to cause the first limiting block 32 to retract into the first telescopic groove 34.

[0042] In actual operation, when a short circuit fault occurs in the circuit, the current inside the trip unit in the short circuit protection component 12 increases sharply, generating a strong induced magnetic field, which causes the trip unit to push the drive board 22 and the traction rod, causing the circuit breaker to trip, which in turn causes the moving contact to separate from the stationary contact, thereby cutting off the faulty circuit.

[0043] refer to Figure 11 During the process of the trip unit pushing the drive plate 22 to move, the drive plate 22 pushes the limit slider 21 through the connector 24 to slide away from the short circuit protection component 12 under the guidance of the first limit component 23. The support rod 212 at the end of the limiting slider 21 drives the support column 213 and the first pin 216 to move synchronously. The first pin 216 pushes the angle lever 215 to rotate around the hinge seat 214. The angle lever 215 pushes the trigger rod 25 to slide upward under the constraint of the second limiting member 26 through the second pin 217. When the trigger rod 25 rises, the support block 27 below it moves upwards simultaneously and compresses the first elastic element 210 sleeved on the telescopic rod 28, so that the first elastic element 210 accumulates reset potential energy.

[0044] At the same time, the end of the trigger rod 25 extending outside the housing 1 moves upward, and the first telescopic groove 34, which was originally located inside the housing 1, gradually protrudes outward. During the upward movement, the edge of the inner wall of the housing 1 abuts against the first wedge-shaped surface 35 of the first limiting block 32, pressing the first limiting block 32 into the first telescopic groove 34. When the trigger rod 25 moves to the limit position pushed by the trip unit, the first telescopic groove 34 is completely moved out of the housing 1. At this time, the switch 31 pops out of the pressing groove 33 under the reset action of the second elastic element 39, and through the cooperation of the first guide groove 37 and the first guide rod 36, it drives the first limiting block 32 to extend out of the first telescopic groove 34, so that the first limiting block 32 is stuck on the outer wall of the housing 1, thereby locking the trigger rod 25 in the corresponding extended position, preventing it from falling back down.

[0045] At this time, since the trigger rod 25 remains in a high position and cannot fall back, the limit slider 21 also remains in the extended state, so that the drive plate 22 is located on the reset path of the lever assembly 14, forming a mechanical block on the lever assembly 14, preventing the operator from pushing the handle to perform the closing operation, thereby effectively avoiding blindly closing the circuit with the fault still in place.

[0046] It should be noted that if the operator forcibly pushes the lever assembly 14 to attempt to close the circuit before pressing the switch 31 to release the first limit block 32 from the outer wall of the housing 1, the trigger rod 25 will be locked and unable to move down, and the angle lever 215 and support column 213 will be locked in place and unable to move with the force applied to the limit slider 21. At this time, when the lever assembly 14 pushes the limiting slider 21, the limiting slider 21 can generate a displacement relative to the stationary support rod 212 by means of the sliding cooperation between the limiting groove 211 and the support rod 212. That is, the limiting groove 211 provides a limited movement clearance for the limiting slider 21. However, since the support rod 212 is fixedly connected to the support column 213 and locked by the angle lever 215, when the limiting slider 21 moves to the point where the end wall of its limiting groove 211 abuts against the support rod 212, the support rod 212 prevents the limiting slider 21 from continuing to move backward, making it unable to return to the initial position. The limiting slider 21 never leaves the reset path of the lever assembly 14 and continues to form an effective mechanical block.

[0047] Once the on-site operator has completed the troubleshooting and repair and confirmed that the circuit is in normal condition, they only need to manually press the switch 31 to make it slide into the pressing groove 33 against the elastic force of the second elastic element 39. During the sliding process of the switch 31, the first guide groove 37 drives the first guide rod 36 to retract through the inclined surface cooperation, thereby pulling the first limit block 32 back into the first telescopic groove 34 and releasing the locking limit between the first limit block 32 and the outer wall of the housing 1.

[0048] At this time, the first elastic element 210 releases the stored energy, pushing the support block 27 to drive the trigger rod 25 to slide down and reset. At the same time, through the reverse transmission of the angle lever 215, the support column 213 and the support rod 212, the limit slider 21 is driven to return to the initial position, the drive plate 22 is disengaged from the obstruction of the lever assembly 14, and the circuit breaker can perform the closing operation normally.

[0049] In summary, by setting up the closing protection mechanism 2 and the triggering component 3, after the short-circuit fault trips, the first limit block 32 extends out of the outer wall of the housing 1 and locks through the linkage of the drive plate 22, the angle lever 215 and the trigger rod 25, fixing the drive plate 22 on the reset path of the lever assembly 14, preventing the closing operation when the fault has not been eliminated, and eliminating the risk of closing with a fault due to behavioral inertia or misjudgment. From a mechanical structure perspective, this ensures a safe operating sequence of maintenance first and then closing. At the same time, after maintenance is completed, only the switch 31 needs to be pressed, and the first limit block 32 is retracted through the first guide rod 36, releasing the energy stored in the first elastic element 210, which can reset the limit slider 21 and the drive plate 22 and remove the obstruction. This can avoid the risk of secondary contact burning and equipment damage caused by closing with a fault, while ensuring convenient unlocking after maintenance, taking into account both safety protection and maintenance efficiency.

[0050] Example 2 The aforementioned closing protection mechanism 2 can only trigger protection under short-circuit fault conditions, ignoring overload faults and failing to transmit fault type information. When faced with the pop-up trigger lever 25, maintenance personnel cannot distinguish the nature of the fault and must use specialized instruments to check each one. This not only prolongs the power outage time and reduces the reliability of power supply, but also leads to misallocation of maintenance resources due to misjudgment of the fault nature, increasing the difficulty of inspection and maintenance costs in multi-circuit power distribution scenarios. Therefore, this embodiment improves the device described in the above embodiment.

[0051] refer to Figure 4 , Figure 5 and Figure 11 The closing protection mechanism 2 also includes a connecting rod 218, a connecting hole 219 on the support column 213, and a limit hook 220 bent on the side of the bimetallic strip 131 away from the short circuit protection component 12. One end of the connecting rod 218 is rotatably connected in the connecting hole 219, and the other end is located on the side of the bimetallic strip 131 away from the short circuit protection component 12.

[0052] refer to Figure 9 and Figure 10 The triggering component 3 also includes a second limiting block 310. The triggering rod 25 has a second telescopic groove 311 on the side away from the first telescopic groove 34, which communicates with the inside of the pressing groove 33. The second limiting block 310 is slidably connected in the second telescopic groove 311. The end of the second limiting block 310 located outside the pressing groove 33 is provided with a second wedge-shaped surface 312.

[0053] refer to Figure 10 The second limit block 310 is fixedly connected to a second guide rod 313 at one end inside the pressing groove 33. A second guide groove 314 is provided on one side of the switch 31. The second guide groove 314 and the first guide groove 37 are located on the same side. The second guide rod 313 is slidably connected in the second guide groove 314.

[0054] When the switch 31 moves toward the inside of the pressing groove 33 to compress the second elastic element 39, the second guide groove 314 cooperates with the second guide rod 313 to cause the second limiting block 310 to retract into the second telescopic groove 311.

[0055] In actual operation, when an overload fault occurs in the circuit, the bimetallic strip 131 will bend and deform due to the heat generated by the continuous overload current. When the deformation reaches a predetermined threshold, the trigger pushes the traction rod or tripping element to trigger the circuit breaker to trip, thereby achieving overload protection.

[0056] Meanwhile, the limiting hook 220, which is bent at the end of the bimetallic strip 131, moves as the bimetallic strip 131 deforms. It pulls the support column 213 through the connecting rod 218, thereby driving the support rod 212 and the limiting slider 21 to move away from the short circuit protection component 12. During the movement, the first pin 216 drives the angle lever 215 to rotate around the hinge seat 214. The angle lever 215 then pushes the trigger rod 25 to slide upward under the guidance of the second limiting member 26 through the second pin 217, so that the part of the trigger rod 25 extending outside the housing 1 gradually increases.

[0057] It should be noted that the driving distance provided by the bending deformation of the bimetallic strip 131 during an overload fault is greater than the electromagnetic driving distance of the trip unit during a short circuit fault. Therefore, the distance that the bimetallic strip 131 drives the support column 213 to move through the connecting rod 218 is greater than the moving distance generated by the trip unit driving the drive board 22 under short circuit conditions.

[0058] refer to Figure 12Under these conditions, the trigger rod 25 rises to a higher position, causing both the first telescopic groove 34 and the second telescopic groove 311 to move outside the housing 1. At this time, the switch 31 pops outward from the pressing groove 33 under the reset action of the second elastic element 39. The first guide groove 37 cooperates with the first guide rod 36 to drive the first limiting block 32 out of the first telescopic groove 34. At the same time, the second guide groove 314 cooperates with the second guide rod 313 to drive the second limiting block 310 out of the second telescopic groove 311. The second limiting block 310 is locked in place. The outer wall of housing 1 locks the trigger rod 25 to a higher position. In this state, the limit slider 21 extends further and blocks the reset path of the lever assembly 14. The length of the trigger rod 25 extending out of housing 1 is significantly different from the extension length during a short circuit fault. Maintenance personnel can directly distinguish the fault type by observing the extension degree of the trigger rod 25: if only the first limit block 32 extends, it is a short circuit fault; if the first limit block 32 and the second limit block 310 extend simultaneously and the trigger rod 25 is exposed longer, it is an overload fault.

[0059] It should be noted that when an overload fault is triggered, the trigger rod 25 is locked in the high position. In this state, if no operator presses the switch 31 to release the lock for a long time, the bimetallic strip 131 will gradually cool and rebound as the fault current disappears and the temperature drops naturally. Since the limit hook 220 is a bent structure, it does not form a fixed connection or latch lock with the connecting rod 218. When the bimetallic strip 131 drives the limit hook 220 to move back to the initial position, the connecting rod 218 will naturally fall downward under the action of gravity and disengage from the bent area of ​​the limit hook 220. It will not interfere with or hinder the rebound and reset of the bimetallic strip 131.

[0060] After maintenance is completed, press switch 31 to make it slide into the pressing groove 33 against the elastic force of the second elastic element 39. The first guide groove 37 and the first guide rod 36 cooperate to retract the first limiting block 32 into the first telescopic groove 34. The second guide groove 314 and the second guide rod 313 cooperate to retract the second limiting block 310 into the second telescopic groove 311. At the same time, the first limiting block 32 and the second limiting block 310 are released from the jamming of the outer wall of the housing 1.

[0061] Subsequently, the first elastic element 210 releases its stored energy, pushing the trigger rod 25 to slide downwards and reset. Through the reverse transmission of the angle lever 215, support column 213, connecting rod 218 and support rod 212, the limit slider 21 and drive plate 22 are pushed back to their initial positions, the obstruction is released, and the circuit breaker resumes normal closing operation.

[0062] In summary, through the design of structures such as the limit hook 220 and the connecting rod 218, the trigger rod 25 can be pushed to a higher position during an overload fault. In conjunction with the second limit block 310 and the second telescopic groove 311 added to the trigger assembly 3, closing interlocking under both overload and short circuit conditions can be achieved. At the same time, during an overload, both the first limit block 32 and the second limit block 310 extend simultaneously, while during a short circuit, only the first limit block 32 extends. Maintenance personnel can directly observe the length of the trigger rod 25 extending out of the housing 1 and the number of limit blocks to distinguish the fault type without the need for instruments to check one by one. After maintenance, pressing the switch 31 will simultaneously retract both limit blocks and complete the reset. Thus, the fault type identification function can be integrated into the mechanical interlocking protection, reducing fault troubleshooting time and misallocation of maintenance resources, and lowering maintenance costs.

[0063] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A circuit breaker with a closing protection assembly, comprising a housing (1), wherein the housing (1) is internally provided with a contact assembly (11), a short-circuit protection assembly (12), an overload protection assembly (13), and a lever assembly (14), characterized in that, Also includes: The closing protection mechanism (2) is located inside the housing (1) and on the reset path of the lever assembly (14). It is used to trigger and lock in the blocking position when the short circuit protection assembly (12) or the overload protection assembly (13) trips, so as to prevent the lever assembly (14) from performing the closing operation. Trigger component (3) is disposed on the closing protection mechanism (2) and is used to release the locking state of the closing protection mechanism (2) during manual operation so that the closing protection mechanism (2) is reset from the blocking position; The closing protection mechanism (2) includes a limiting slider (21) and a drive plate (22). The inner wall of the housing (1) is fixedly connected to a first limiting member (23). The limiting slider (21) is slidably connected inside the first limiting member (23). The drive plate (22) is fixedly connected to one end of the limiting slider (21) near the short circuit protection component (12) through a connector (24). The drive plate (22) is used to receive the driving force of the short circuit protection component (12) and drive the limiting slider (21) to slide. The closing protection mechanism (2) further includes a trigger rod (25), which is perpendicular to the limiting slider (21). A second limiting member (26) is fixedly connected to the inner wall of the housing (1). The trigger rod (25) is slidably connected inside the second limiting member (26). A support block (27) is fixedly connected below the second limiting member (26) to the trigger rod (25). A first elastic member (210) is connected between the second limiting member (26) and the support block (27). The first elastic member (210) is used to drive the trigger rod (25) to reset. The trigger assembly (3) includes a switch (31) and a first limiting block (32). The trigger rod (25) extends to the outside of the housing (1) and has a pressing groove (33) at one end. The switch (31) is slidably connected in the pressing groove (33). The trigger rod (25) has a first telescopic groove (34) communicating with the pressing groove (33) on one side. The first limiting block (32) is slidably connected in the first telescopic groove (34). The first limiting block (32) is used to extend out of the first telescopic groove (34) and lock into the outer wall of the housing (1) when the trigger rod (25) extends out of the housing (1).

2. The circuit breaker with closing protection component according to claim 1, characterized in that, The closing protection mechanism (2) further includes an angle lever (215) and a support column (213). A hinge seat (214) is fixedly connected inside the housing (1). The angle lever (215) is rotatably connected to the hinge seat (214). One end of the support column (213) is connected to the limiting slider (21) through a support rod (212). One end of the angle lever (215) is rotatably connected to the support column (213) through a first pin (216). The other end of the angle lever (215) is rotatably connected to the trigger rod (25) through a second pin (217). The angle lever (215) is used to convert the sliding of the limiting slider (21) into the axial movement of the trigger rod (25).

3. The circuit breaker with closing protection component according to claim 2, characterized in that, The limiting slider (21) has a limiting groove (211) at one end away from the short circuit protection component (12), and the support rod (212) is slidably connected in the limiting groove (211).

4. The circuit breaker with closing protection component according to claim 1, characterized in that, The triggering component (3) further includes a second limiting block (310). The triggering rod (25) has a second telescopic groove (311) on the side away from the first telescopic groove (34) that communicates with the pressing groove (33). The second limiting block (310) is slidably connected in the second telescopic groove (311). The second limiting block (310) is used to extend out of the second telescopic groove (311) and lock onto the outer wall of the housing (1) when the triggering rod (25) extends to a greater stroke due to the overload protection component (13) tripping.

5. The circuit breaker with closing protection component according to claim 2, characterized in that, The closing protection mechanism (2) further includes a connecting rod (218). The overload protection component (13) includes a bimetallic strip (131). The end of the bimetallic strip (131) is provided with a limit hook (220). One end of the connecting rod (218) is rotatably connected to the support column (213), and the other end is connected to the limit hook (220). The connecting rod (218) is used to transmit the deformation displacement of the bimetallic strip (131) to the support column (213) to drive the trigger rod (25) to move.

6. The circuit breaker with closing protection component according to claim 4, characterized in that, The first limiting block (32) is fixedly connected to a first guide rod (36) at one end inside the pressing groove (33), and the second limiting block (310) is fixedly connected to a second guide rod (313) at one end inside the pressing groove (33). A first guide groove (37) that cooperates with the first guide rod (36) and a second guide groove (314) that cooperates with the second guide rod (313) are provided on one side of the switch (31). The first guide groove (37) and the second guide groove (314) are used to drive the first guide rod (36) and the second guide rod (313) to move respectively when the switch (31) is pressed, so that the first limiting block (32) and the second limiting block (310) retract into the corresponding telescopic groove.

7. The circuit breaker with closing protection component according to claim 6, characterized in that, The switch (31) has an installation groove (38) at one end inside the pressing groove (33). A second elastic element (39) is sleeved inside the installation groove (38). One end of the second elastic element (39) is connected to the inner wall of the installation groove (38), and the other end is connected to the inner wall of the pressing groove (33).

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