Residual current protection circuit breaker

Abstract

The invention relates to the technical field of circuit breakers, and discloses a residual current protection circuit breaker which comprises a shell, moving contacts and static contacts arranged in the shell, and a tripping mechanism arranged in the shell, the tripping mechanism comprises an electromagnetic tripping coil and a transmission assembly, the moving contacts and the static contacts are arranged in multiple groups, and the transmission assembly is arranged in the shell. The moving contact comprises a connecting part and conductive parts arranged at the two ends of the connecting part, the connecting part is rotationally arranged in the shell, the conductive parts are used for being electrically connected with the static contacts, the static contacts are arranged at the two ends of the moving contact respectively, each connecting part is provided with a rotating column, each rotating column is jointly provided with a connecting rod, the connecting rod is rotationally provided with a driving arm, and the driving arm is arranged on the driving arm. The transmission assembly can drive the driving arm to rotate. The force transmission path is shorter and more direct, the mechanical loss is small, the response speed of the tripping mechanism and the synchronization precision of the action are effectively improved, and the breaking speed of the circuit breaker is accelerated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breakers, in particular to a residual current circuit breaker. BACKGROUND

[0002] A residual current circuit breaker is an electrical safety device that detects the residual current in the line and automatically cuts off the power supply when danger occurs. It is also known as a leakage switch or leakage protector. Its core function is to prevent electric shock and electrical fire. By comparing the current flowing into and out of the circuit, when an unbalanced current exceeding the preset threshold is detected, the circuit can be disconnected in a very short time, thereby protecting other electrical components in the power system and improving the safety of electricity use.

[0003] In related technologies, a residual current circuit breaker includes a housing, a moving contact and a static contact arranged in the housing, and a tripping mechanism arranged in the housing. The tripping mechanism generally includes an electromagnetic tripping coil and a transmission assembly connected to the moving contact and the static contact. When the circuit fails, the magnetic force generated by the electromagnetic tripping coil can drive the transmission assembly to act, thereby disconnecting the moving contact and the static contact to protect the power system.

[0004] However, the transmission assembly in the above-mentioned residual current circuit breaker has slow response speed and low stability, resulting in slow disconnection speed of the circuit breaker, complex structure of the transmission assembly, and easy jamming during long-term use, which affects the protection effect of the circuit breaker, and therefore needs to be improved. SUMMARY

[0005] In order to improve the response speed of the transmission assembly in the circuit breaker and speed up the disconnection speed of the circuit breaker, the present application provides a residual current circuit breaker.

[0006] The residual current circuit breaker provided by the present application adopts the following technical scheme: A residual current circuit breaker includes a housing, a moving contact and a static contact arranged in the housing, and a tripping mechanism arranged in the housing. The tripping mechanism includes an electromagnetic tripping coil and a transmission assembly. The moving contact includes a connecting portion and a conductive portion arranged at both ends of the connecting portion. The connecting portion is rotatably arranged in the housing. The conductive portion is used for electrical connection with the static contact. One static contact is arranged at each end of the moving contact. Each connecting portion is provided with a rotating column. A connecting rod is commonly arranged on each rotating column. A driving arm is rotatably arranged on the connecting rod. The transmission assembly can drive the driving arm to rotate.

[0007] By adopting the technical scheme, when the transmission assembly drives the driving arm to rotate, the rotary motion of the driving arm can be synchronously and directly transmitted to the rotating columns of all the movable contacts through the connecting rods, so that all the movable contacts are synchronously rotated around the rotating center of the connecting portion, and the rapid and consistent breaking or closing of all the contacts is realized. Compared with the chain type or indirect transmission that can be used in some existing technologies, the rigid mechanical linkage has a shorter and more direct force transmission path, small mechanical loss, and effectively improves the response speed and synchronous precision of the tripping mechanism, and accelerates the breaking speed of the circuit breaker.

[0008] Optionally, a plurality of the connecting rods are uniformly arranged in the circumferential direction of the rotating column, and a fixing plate is arranged on each of the connecting rods.

[0009] By adopting the technical scheme, firstly, the plurality of connecting rods are uniformly distributed around the circumferential direction of the rotating column, so that the connection between the rotating columns is more stable, and thus the driving force transmitted by the driving arm to the connecting rods can act on the rotating portions of the rotating columns and the movable contacts in a multi-point and uniform manner, avoiding stress concentration, unsmooth rotation or component deformation caused by single-point local force, and ensuring the long-term stability and mechanical reliability of the movable contacts under frequent operation. Secondly, the fixing plate arranged on each of the connecting rods strengthens and stabilizes the linkage structure composed of the connecting rods and the rotating column, and connects the plurality of connecting rods into a rigid structure with higher integrity, further improving the overall strength and rigidity of the connecting rods and the rotating column, so that the driving force transmitted by the driving arm to the connecting rods can be transmitted to another connecting rod through the fixing plate, thereby causing the rotating column to be uniformly stressed in multiple points, preventing displacement or deformation of the connecting rod caused by long-term vibration or impact, and ensuring the accuracy and consistency of the transmission operation, and improving the service life and operation reliability of the circuit breaker.

[0010] Optionally, an installation rod is arranged at the end of the driving arm away from the connecting rod, a triangular plate is arranged on the installation rod, a trigger plate and a handle support are rotatably arranged in the shell, the handle support is used to drive the handle to rotate in the closing or opening direction, the trigger plate is rotatably arranged on the side of the handle support close to the installation rod, the trigger plate abuts against the handle support, one end of the triangular plate is rotatably connected to the trigger plate, the hinge point of the handle support is located on the side of the installation rod away from the trigger plate, an opening spring is arranged on the installation rod, one end of the opening spring is connected to the handle support, and the opening spring is used to drive the handle support to rotate in the opening direction, and the transmission assembly can limit the trigger plate in the closing position.

[0011] By adopting the technical scheme, when the operator manually pushes the handle to close, the handle drives the handle support to rotate to the closing direction, so that the handle support pushes the trigger plate to rotate to the closing direction, so that the triangular plate rotates to the closing direction, so that the triangular plate drives the driving arm to move to the closing direction through the mounting rod, so that the movable contact rotates to the position where the two ends contact the static contact. In the process of rotating the handle support to the closing direction, the driving arm moves to the side away from the trigger plate and the handle support, so that the movable contact rotates to the closing direction. Therefore, the mounting rod moves away from the handle support, so that the opening spring is stretched and has a pre-tightening force to drive the handle support to rotate to the opening direction. Once the electromagnetic release coil generates a magnetic force to drive the transmission assembly to act, the transmission assembly removes the limiting of the trigger plate, so that the handle support and the trigger plate can rotate to the opening direction under the action of the force of the opening spring, so that the trigger plate drives the driving arm to move to the opening direction through the triangular plate and the mounting rod, and finally the movable contact is stably kept at the opening position.

[0012] The hinge point of the handle support is arranged on the side of the mounting rod away from the trigger plate. This lever arrangement optimizes the force transmission efficiency, so that the force arm is longer than the force arm of the opening spring when manually closing, so that the manual closing operation is more labor-saving. At the same time, the opening spring directly acts on the lever system and stores elastic potential energy. When the transmission assembly removes the limiting of the trigger plate, the energy stored by the opening spring can be quickly released through the lever system to drive the handle support and the entire contact system linked therewith to quickly rotate to the opening direction, thereby realizing rapid release. The energy release paths of manual operation, state maintenance and automatic release are highly integrated and optimized, which significantly improves the speed and reliability of the entire action cycle of closing-maintenance-opening.

[0013] Optionally, the transmission assembly comprises a limiting block rotatably arranged in the shell, a reset plate rotatably arranged in the shell, and a driving rod arranged on the electromagnetic release coil. The reset plate is used to limit the trigger plate at the closing position. A reset torsional spring is arranged on the rotation shaft of the reset plate, and the reset torsional spring has a tendency to drive the reset plate away from the trigger plate. The limiting block is arranged on the side of the reset plate away from the trigger plate. The limiting block can hinder the reset plate from rotating away from the trigger plate. The driving rod can drive the limiting block to rotate. A limiting torsional spring is arranged on the rotation shaft of the limiting block, and the limiting torsional spring is used to fix the limiting block at the position of limiting the reset plate.

[0014] By adopting the technical scheme, under the normal closing state, the reset plate is kept in the closing position under the hindering of the limiting block, thereby limiting the trigger plate in the closing position. When the fault occurs and the electromagnetic tripping coil acts, the driving rod is pushed to directly drive the limiting block to rotate against the force of the limiting torsional spring. Once the limiting block rotates to remove the hindering of the reset plate, the reset plate is quickly rotated away from the trigger plate under the action of the self-resetting torsional spring, thereby removing the limiting of the trigger plate. At this time, the mechanism driven by the opening spring, such as the handle support, is no longer constrained and immediately performs the opening action. The action logic is clear, the link from the action of the electromagnetic tripping coil to the removal of the mechanical limiting is short, the response is extremely fast, the reset is made by using the torsional spring, so that after the fault is eliminated, the relevant components can be automatically or simply reset to the standby trigger state, the structure of the limiting block and the reset plate is relatively simple, the kinematic pairs are few, and the limiting block and the reset plate are not prone to jamming after long-term use, thereby effectively solving the problem that the transmission assembly structure is complex and is prone to jamming after long-term use.

[0015] Optionally, the reset plate is arranged on one side of the trigger plate, the reset plate comprises a limiting portion and an abutting portion, the limiting portion is rotationally arranged in the shell, the abutting portion abuts against the limiting block, a limiting slot is formed in the limiting portion, and the trigger plate is provided with a stop block, when the trigger plate is in the closing position, the stop block extends into the limiting slot, and the slot wall of the limiting slot can hinder the movement of the stop block.

[0016] By adopting the technical scheme, when the closing is performed, the stop block on the trigger plate extends into the limiting slot of the reset plate, thereby providing a very direct and firm closing position locking mode. That is, the slot wall of the limiting slot cooperates with the side surface of the stop block to form a mechanical constraint of surface contact, which can effectively resist the force of the opening spring trying to pull the trigger plate and the handle support to rotate, thereby ensuring that the closing state is extremely stable when there is no fault and mis-tripping does not occur. Meanwhile, when the reset plate rotates to move the limiting slot away, the stop block can be taken out of the limiting slot without any hindering, the action is crisp and smooth, there is no risk of friction or hooking, and the rapidity and reliability of the tripping action are further ensured.

[0017] Optionally, the limiting block comprises a rotating portion, a stop portion arranged on the rotating portion and a transmission portion connected to the driving rod, the rotating portion is rotationally arranged in the shell, the stop portion is provided with a limiting inclined surface and a guide arc surface, when the reset plate is in the closing position, the limiting inclined surface abuts against the reset plate, and the guide arc surface is used for guiding the reset plate to rotate towards the trigger plate.

[0018] By adopting the technical scheme, firstly, the abutment of the limiting slope and the reset plate in the closed state provides a stable self-locking angle, and enhances the closed holding force. Secondly, during the closing operation of the circuit breaker, the reset plate needs to move towards the trigger plate to complete the locking. The guide curved surface provides smooth guidance for the movement of the reset plate, so that it can smoothly slide through the protruding part of the limiting block, and finally the limiting slope abuts against the reset plate, thereby locking the reset plate. The closing feeling is optimized, the situation of jamming or needing to impact to lock during closing is avoided, the operation is smoother, the impact and wear between components are reduced, the service life and reliability of the mechanism under long-term use are improved.

[0019] Optionally, the transmission part is connected to the rotating part, and a connecting hole is formed in the transmission part, and one end of the driving rod extends into the connecting hole.

[0020] By adopting the technical scheme, the cooperation between the connecting hole and the end of the driving rod is a kind of pivoting with a certain gap. This connection mode allows the driving rod to swing or move within a certain range, and effectively converts the linear motion or small-angle swing generated by the electromagnetic tripping coil into the torque required for driving the limiting block to rotate, thereby ensuring the sensitivity of the tripping mechanism. The connection structure is simple, easy to process and assemble, and the connection point of the driving rod and the transmission part is not easy to loosen or excessively worn due to long-term operation, thereby ensuring the reliability and durability of the electromagnetic tripping signal transmission to the mechanical execution mechanism.

[0021] Optionally, the housing further rotatably has an indicating block, the indicating block is provided with a closing indicator and an opening indicator, the rotation direction of the indicating block is consistent with the rotation direction of the handle support, the closing indicator and the opening indicator are arranged and distributed along the rotation direction of the indicating block, the housing is provided with an observation window, the indicating block is arranged at the observation window, the housing is slidably provided with a driving plate and a driven plate, the driving plate is arranged on the connecting rod, one end of the driven plate abuts against the driving plate and the other end abuts against the indicating block, when the movable contact moves, the driven plate can push the indicating block to rotate.

[0022] By adopting the technical scheme, the indicating block is mechanically connected with the driving plate and the connecting rod, so that the rotating state of the indicating block is strictly synchronous and real-time corresponding to the on-off state of the moving contact. When the moving contact operates, the driving plate is driven to slide by the connecting rod, so that the driving plate pushes the driven plate to slide, and then drives the indicating block to rotate, so that the indicating plate corresponding to the on or off appears in the observation window for the staff to observe the on-off state of the circuit breaker. The mechanical direct connection indication method has 100% accuracy, is not affected by human error or electronic failure, and does not need to additionally set other electronic elements for indication function, thereby saving the production cost of the circuit breaker. It provides clear and correct internal contact state information of the circuit breaker for the user or maintenance personnel, greatly improves the safety and maintainability of the equipment, reduces the risk of live operation due to misjudgment of the circuit breaker state, and provides an intuitive and reliable on-off state indication function.

[0023] Optionally, the driving plate is provided with a sliding hole, and the connecting rod extends into the sliding hole, and the diameter of the sliding hole is larger than the diameter of the connecting rod.

[0024] By adopting the technical scheme, the connecting rod extends into the sliding hole, so that the connecting rod can drive the driving plate to slide when the connecting rod is driven by the driving arm, thereby driving the driven plate and the indicating block to operate, so that the driving effect of the connecting rod on the driving plate is good, thereby ensuring the indication function of the indicating block. The diameter of the sliding hole is larger than the diameter of the connecting rod, so that the connecting rod can move in the sliding hole, so that the arc-shaped movement path of the connecting rod can normally drive the driving plate to slide along a straight line, so that the driving plate can accurately drive the driven plate and the indicating block to operate. When the driving plate is damaged after long-term use, the driving plate can be taken out from the connecting rod to replace a new driving plate, so that the driving plate can be replaced individually without replacing the entire circuit breaker, thereby reducing the maintenance cost of the circuit breaker and prolonging the service life of the circuit breaker.

[0025] In summary, the present application has at least one of the following beneficial technical effects: 1. The rigid synchronous linkage mechanism composed of the connecting rod and the rotating column directly and synchronously transmits the operation of the driving arm to all moving contacts, the force transmission path is short and efficient, the multi-pole contacts can be almost simultaneously broken when a fault occurs, the total breaking time is significantly shortened, and the breaking speed is improved; 2. The plurality of connecting rods and the fixed plate structure are uniformly arranged in the circumferential direction, the overall rigidity and strength of the rotating column and the connecting rod structure are improved, the stress distribution is uniform, the guide arc surface on the limiting block makes the on operation smooth, and the impact and wear are reduced; 3. By mechanically connecting the indication block with the connecting rod, the absolute synchronization of the indication state and the actual position of the moving contact is ensured, which provides clear and reliable visual feedback of the opening and closing state for the user, greatly enhancing the safety of equipment operation and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0027] Figure 2 is a schematic diagram of the structure for displaying the indication block after hiding part of the shell in the embodiment of the present application.

[0028] Figure 3 is a schematic diagram of the structure for displaying the moving contact after hiding the rotating column in the embodiment of the present application.

[0029] Figure 4 is a schematic diagram of the structure for displaying the reset plate after hiding the electromagnetic release coil in the embodiment of the present application.

[0030] Figure 5 is Figure 4 is an enlarged view of A in

[0031] Figure 6 is a schematic diagram of the structure for displaying the closing state of the circuit breaker after hiding part of the shell in the embodiment of the present application.

[0032] BRIEF DESCRIPTION OF DRAWINGS 1, shell; 11, observation window; 12, driving plate; 121, sliding hole; 13, driven plate; 14, moving contact; 141, connecting part; 142, conductive part; 143, rotating column; 144, connecting rod; 145, fixing sheet; 146, driving arm; 147, mounting rod; 148, triangular plate; 149, opening spring; 15, static contact; 16, trigger plate; 161, stop block; 17, handle support; 2, indication block; 21, closing indication board; 22, opening indication board; 3, release mechanism; 31, electromagnetic release coil; 32, transmission assembly; 321, limiting block; 322, reset plate; 323, driving rod; 324, limiting part; 325, abutting part; 326, limiting groove; 327, reset torsional spring; 33, rotating part; 331, stop part; 332, transmission part; 333, limiting inclined surface; 334, guide curved surface; 335, connecting hole. DETAILED DESCRIPTION

[0033] The following will be described in detail in combination with the accompanying Figures 1-6 The present application will be further described in detail.

[0034] The embodiment of the present application discloses a residual current protection circuit breaker.

[0035] Reference will be made to Figure 1 andFigure 2 A residual current circuit breaker comprises a shell 1, an indicating block 2 is rotatably arranged in the shell 1, a closing indicator 21 and an opening indicator 22 are arranged on the indicating block 2, the closing indicator 21 and the opening indicator 22 are arranged and distributed along the rotation direction of the indicating block 2, an observation window 11 is arranged on the shell 1, and the indicating block 2 is arranged at the observation window 11.

[0036] With reference to Figure 2 A driving plate 12 and a driven plate 13 are also slidably arranged in the shell 1, a sliding hole 121 is arranged on the driving plate 12, one end of the driven plate 13 abuts against the driving plate 12 and the other end abuts against the indicating block 2, and the driven plate 13 can push the indicating block 2 to rotate when the moving contact 14 acts.

[0037] With reference to Figure 2 The shell 1 is also provided with the moving contact 14, the static contact 15 and the tripping mechanism 3, the tripping mechanism 3 comprises an electromagnetic tripping coil 31 and a transmission assembly 32. The driven plate 13 can push the indicating block 2 to rotate when the moving contact 14 acts. The moving contact 14 and the static contact 15 are arranged in multiple groups, which can increase the circuit breaking capacity and improve the protection performance of the circuit breaker.

[0038] With reference to Figure 3 The moving contact 14 comprises a connecting portion 141 and a conductive portion 142 arranged at both ends of the connecting portion 141, and the connecting portion 141 is rotatably arranged in the shell 1. When the circuit needs to be disconnected or connected, the connecting portion 141 can be flexibly rotated in the shell 1, and the conductive portion 142 is used for electrical connection with the static contact 15 to realize the conduction of the circuit.

[0039] With reference to Figure 2 And Figure 3 One static contact 15 is arranged at each end of the moving contact 14 to ensure that the conductive portion 142 can accurately contact or separate from the static contact 15 during the rotation of the moving contact 14. Each connecting portion 141 is provided with a rotating column 143, and the rotating columns 143 are commonly provided with a connecting rod 144, the connecting rod 144 is uniformly provided with a plurality of connecting rods 144 in the circumferential direction of the rotating column 143, and the driving plate 12 is arranged on the connecting rod 144.

[0040] With reference to Figure 2 , Figure 3 And Figure 4 Each connecting rod 144 is commonly provided with a fixing sheet 145, a driving arm 146 is rotatably arranged on the connecting rod 144, and the driving arm 146 is rotatably arranged on one of the connecting rods 144. The transmission assembly 32 can drive the driving arm 146 to rotate, the rotation of the driving arm 146 drives the connecting rod 144 and the rotating column 143 to move, and then the moving contact 14 rotates to realize the opening and closing of the moving contact 14 and the static contact 15.

[0041] ​With reference to Figure 2 The connecting rod 144 extends into the sliding hole 121 of the driving plate 12, and the diameter of the sliding hole 121 is greater than the diameter of the connecting rod 144. In this way, a gap is formed between the driving plate 12 and the connecting rod 144, so that the driving plate 12 can adapt to the movement of the connecting rod 144 under different working conditions, thereby ensuring the stability and reliability of the entire indicating system.

[0042] With reference to Figure 1 and Figure 2 When the connecting rod 144 moves in the direction of opening, the driving plate 12 moves accordingly, and then the driven plate 13 is pushed, thereby pushing the indicating block 2 to rotate. When the movable contact 14 is closed, the connecting rod 144 moves and drives the driving plate 12 to move downward, and the driven plate 13 moves downward under the action of its own gravity. Since the rotating shaft of the indicating block 2 is not at the center of gravity, when the driven plate 13 does not push the indicating block 2 to rotate, the indicating block 2 will also rotate in the direction of closing under the action of its own gravity, so that the closed indicating board 21 is aligned with the observation window 11, and the closed state is displayed.

[0043] With reference to Figure 2 , Figure 3 and Figure 4 The end of the driving arm 146 away from the connecting rod 144 is provided with a mounting rod 147, and the mounting rod 147 is fixedly provided with a triangular plate 148. The trigger plate 16 and the handle bracket 17 are rotatably arranged in the housing 1. The rotating direction of the handle bracket 17 is consistent with the rotating direction of the indicating block 2. The handle bracket 17 is used to drive the handle to rotate in the closing or opening direction. The trigger plate 16 is rotatably arranged on the side of the handle bracket 17 close to the mounting rod 147, and the trigger plate 16 abuts against the handle bracket 17.

[0044] With reference to Figure 3 and Figure 4 One end of the triangular plate 148 is rotatably connected to the trigger plate 16. The hinge point of the handle bracket 17 is located on the side of the mounting rod 147 away from the trigger plate 16. The mounting rod 147 is provided with an opening spring 149. One end of the opening spring 149 away from the mounting rod 147 is connected to the handle bracket 17. The opening spring 149 is used to drive the handle bracket 17 to rotate in the opening direction. The transmission assembly 32 can limit the trigger plate 16 at the closed position.

[0045] With reference to Figure 4 The mounting rod 147 can be cylindrical and is fixed to the driving arm 146 by screw connection or the like to ensure the firmness of the connection. The triangular plate 148 can be an equilateral triangle. One of the corners is fixedly connected to the mounting rod 147, another corner is rotatably connected to the trigger plate 16, and the third corner is a free end. The trigger plate 16 is rotatably connected to the housing 1 by a shaft and can freely rotate about the shaft. The handle bracket 17 is also rotatably connected to the housing 1 by a shaft and is connected to the handle by integral molding or other means.

[0046] With reference to Figure 3 and Figure 4 When the transmission assembly 32 limits the trigger plate 16 in the closed position, the opening spring 149 is in a stretched state, storing elastic potential energy. When the transmission assembly 32 releases the limit of the trigger plate 16, the opening spring 149 releases the elastic potential energy, drives the handle bracket 17 to rotate in the opening direction, and at the same time drives the driving arm 146 to rotate through the triangular plate 148 and the mounting rod 147, thereby driving the moving contact 14 to separate from the static contact 15, realizing the opening action, making the opening action more rapid and reliable.

[0047] With reference to Figure 2 and Figure 4 The transmission assembly 32 includes a limiting block 321 rotatably arranged in the shell 1, a reset plate 322 rotatably arranged in the shell 1, and a driving rod 323 arranged on the electromagnetic release coil 31. The reset plate 322 is used to limit the trigger plate 16 in the closed position, and the reset plate 322 is arranged on one side of the trigger plate 16. The reset plate 322 includes a limiting portion 324 and an abutting portion 325. The limiting portion 324 is rotatably arranged in the shell 1, and the abutting portion 325 abuts against the limiting block 321.

[0048] With reference to Figure 4 and Figure 5 A limiting groove 326 is formed on the limiting portion 324. The trigger plate 16 is provided with a stop block 161. When the trigger plate 16 is in the closed position, the stop block 161 on the trigger plate 16 extends into the limiting groove 326, and the groove wall of the limiting groove 326 can hinder the movement of the stop block 161. A reset torsion spring 327 is arranged on the rotating shaft of the reset plate 322. The reset torsion spring 327 has a tendency to drive the reset plate 322 away from the trigger plate 16.

[0049] With reference to Figure 3 , Figure 4 and Figure 5 The limiting block 321 is arranged on the side of the reset plate 322 away from the trigger plate 16. The limiting block 321 can hinder the rotation of the reset plate 322 away from the trigger plate 16, and the driving rod 323 can drive the rotation of the limiting block 321. A limiting torsion spring (not shown in the figure) is arranged on the rotating shaft of the limiting block 321. The limiting torsion spring is used to fix the limiting block 321 in the position of limiting the reset plate 322.

[0050] With reference to Figure 3 , Figure 4 and Figure 5The limiting block 321 comprises a rotating part 33, a stop part 331 provided on the rotating part 33, and a transmission part 332 connected to the driving rod 323. The rotating part 33 is rotatably arranged in the shell 1. The stop part 331 is provided with a limiting inclined surface 333 and a guide arc surface 334. When the reset plate 322 is in the closed position, the limiting inclined surface 333 abuts against the abutting part 325 of the reset plate 322, and the guide arc surface 334 is used to guide the reset plate 322 to rotate towards the trigger plate 16. The transmission part 332 is connected to the rotating part 33, and the transmission part 332 is provided with a connecting hole 335. One end of the driving rod 323 extends into the connecting hole 335.

[0051] With reference to Figure 5 and Figure 6 The limiting part 324 is generally in a plate shape, and is provided with a shaft hole in the middle. The limiting part 324 is rotatably connected to the shell 1 through the shaft hole. The abutting part 325 can be integrally formed with the limiting part 324 and is in a plate shape. The abutting part 325 is used to contact the limiting block 321. When the trigger plate 16 rotates to the closed position, the stop block 161 on the trigger plate 16 extends into the limiting groove 326 of the limiting part 324. The groove wall of the limiting groove 326 prevents the stop block 161 from moving, thereby fixing the trigger plate 16 at the closed position. When the reset plate 322 rotates under the action of the reset torsion spring 327, the limiting groove 326 is separated from the stop block 161, and the trigger plate 16 is no longer limited, thereby realizing the opening operation.

[0052] With reference to Figure 5 and Figure 6 The rotating part 33 is generally in a cylindrical shape, and is provided with a shaft hole in the middle. The rotating part 33 is rotatably connected to the shell 1 through the shaft hole. The stop part 331 can be integrally formed with the rotating part 33 and is in a block shape. The limiting inclined surface 333 and the guide arc surface 334 are special shapes of the surface of the stop part 331 and are used to cooperate with the abutting part 325. The limiting inclined surface 333 contacts the side surface of the reset plate 322 and plays a limiting role.

[0053] With reference to Figure 3 and Figure 4 The driving rod 323 can be in a rod shape and is connected to the core of the electromagnetic release coil 31. When the electromagnetic release coil 31 is electrified to generate a magnetic force, the driving rod 323 moves together with the core. The limiting torsion spring is arranged on the rotating shaft of the limiting block 321, so that the limiting block 321 is kept at the closed position and limits the reset plate 322.

[0054] The implementation principle of the residual current circuit breaker according to an embodiment of the present application is as follows: by adopting the design of multiple sets of moving contacts 14 and static contacts 15, the circuit breaking capacity is increased, and the protection performance of the circuit breaker is improved. When a fault occurs in the circuit, the electromagnetic tripping coil 31 is energized, the driving rod 323 drives the limiting block 321 to rotate, the limiting of the reset plate 322 is released, the reset plate 322 is away from the trigger plate 16 under the action of the reset torsion spring 327, the trigger plate 16 loses the limiting, the handle support 17 is rotated to the opening direction under the action of the opening spring 149, and the moving contacts 14 and the static contacts 15 are separated. The breaking speed and stability of the circuit breaker are improved, the problem of the transmission assembly 32 being stuck is reduced, and the protection effect and reliability of the circuit breaker are improved.

[0055] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A residual current protection circuit breaker, comprising a housing (1), a moving contact (14) and a stationary contact (15) disposed in the housing (1), and a tripping mechanism (3) disposed in the housing (1), wherein the tripping mechanism (3) comprises an electromagnetic tripping coil (31) and a transmission assembly (32), characterized in that: Multiple sets of moving contacts (14) and stationary contacts (15) are provided. The moving contact (14) includes a connecting part (141) and conductive parts (142) provided at both ends of the connecting part (141). The connecting part (141) is rotatably disposed in the housing (1). The conductive parts (142) are used to electrically connect with the stationary contacts (15). The stationary contacts (15) are provided at both ends of the moving contact (14). Each connecting part (141) is provided with a rotating column (143). Each rotating column (143) is provided with a connecting rod (144). A driving arm (146) is rotatably disposed on the connecting rod (144). The transmission assembly (32) can drive the driving arm (146) to rotate.

2. A residual current protection circuit breaker according to claim 1, characterized in that: Multiple connecting rods (144) are evenly arranged around the rotating column (143), and a fixing plate (145) is provided on each connecting rod (144). The driving arm (146) is rotatably mounted on one of the connecting rods (144).

3. A residual current protection circuit breaker according to claim 1, characterized in that: The drive arm (146) has a mounting rod (147) at one end away from the connecting rod (144). A triangular plate (148) is mounted on the mounting rod (147). A trigger plate (16) and a handle bracket (17) are rotatably disposed within the housing (1). The handle bracket (17) is used to drive the handle to rotate in the direction of closing or opening the circuit breaker. The trigger plate (16) is rotatably disposed on the side of the handle bracket (17) near the mounting rod (147). The trigger plate (16) abuts against the handle bracket (17). One end of the triangular plate (148) is rotatably connected to the trigger plate (16). The hinge point of the handle bracket (17) is located on the side of the mounting rod (147) away from the trigger plate (16). The mounting rod (147) is provided with a tripping spring (149). One end of the tripping spring (149) is connected to the handle bracket (17). The tripping spring (149) is used to drive the handle bracket (17) to rotate in the direction of tripping. The transmission assembly (32) can limit the trigger plate (16) to the closed position.

4. A residual current protection circuit breaker according to claim 3, characterized in that: The transmission assembly (32) includes a limiting block (321) rotatably disposed in the housing (1), a reset plate (322) rotatably disposed in the housing (1), and a drive rod (323) disposed on the electromagnetic trip coil (31). The reset plate (322) is used to limit the trigger plate (16) to the closed position. A reset torsion spring (327) is provided on the rotating shaft of the reset plate (322). The reset torsion spring (327) has the function of driving the reset plate (322) away from the trigger plate (16). The trend of 16) is such that the limiting block (321) is located on the side of the reset plate (322) away from the trigger plate (16). The limiting block (321) can prevent the reset plate (322) from rotating away from the trigger plate (16). The driving rod (323) can drive the limiting block (321) to rotate. The limiting block (321) is provided with a limiting torsion spring on its rotating shaft. The limiting torsion spring is used to fix the limiting block (321) at the position that limits the reset plate (322).

5. A residual current protection circuit breaker according to claim 4, characterized in that: The reset plate (322) is disposed on one side of the trigger plate (16). The reset plate (322) includes a limiting part (324) and an abutting part (325). The limiting part (324) is rotatably disposed in the outer shell (1). The abutting part (325) abuts against the limiting block (321). A limiting groove (326) is provided on the limiting part (324). A stop block (161) is provided on the trigger plate (16). When the trigger plate (16) is in the closed position, the stop block (161) extends into the limiting groove (326). The groove wall of the limiting groove (326) can prevent the stop block (161) from moving.

6. A residual current protection circuit breaker according to claim 4, characterized in that: The limiting block (321) includes a rotating part (33), a stop part (331) disposed on the rotating part (33), and a transmission part (332) connected to the drive rod (323). The rotating part (33) is rotatably disposed in the outer shell (1). The stop part (331) is provided with a limiting inclined surface (333) and a guiding arc surface (334). When the reset plate (322) is in the closed position, the limiting inclined surface (333) abuts against the reset plate (322), and the guiding arc surface (334) is used to guide the reset plate (322) to rotate towards the trigger plate (16).

7. A residual current protection circuit breaker according to claim 6, characterized in that: The transmission part (332) is connected to the rotating part (33), and the transmission part (332) has a connecting hole (335), one end of the drive rod (323) extends into the connecting hole (335).

8. A residual current protection circuit breaker according to claim 1, characterized in that: An indicator block (2) is rotatably disposed in the outer casing (1). The indicator block (2) is provided with a closing indicator (21) and a closing indicator (22). The rotation direction of the indicator block (2) is consistent with the rotation direction of the handle bracket (17). The closing indicator (21) and the closing indicator (22) are arranged along the rotation direction of the indicator block (2). An observation window (11) is provided on the outer casing (1). The indicator block (2) is disposed at the observation window (11). An active plate (12) and a driven plate (13) are slidably disposed in the outer casing (1). The active plate (12) is disposed on the connecting rod (144). One end of the driven plate (13) abuts against the active plate (12) and the other end abuts against the indicator block (2). When the moving contact (14) is activated, the driven plate (13) can push the indicator block (2) to rotate.

9. A residual current protection circuit breaker according to claim 8, characterized in that: The active plate (12) has a sliding hole (121) and the connecting rod (144) extends into the sliding hole (121). The diameter of the sliding hole (121) is larger than the diameter of the connecting rod (144).

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