Protection module and circuit breaker

Abstract

The protection module comprises a magnetic flux release, the magnetic flux release comprises a fixed magnet yoke, a coil framework, a coil, a static iron core, a movable iron core, a push rod and a counter-force spring, and the movable iron core is provided with a movable iron core locking face used for being in locking fit with the push rod matching face; when the magnetic flux release is in a first operation state, the movable iron core locking surface is locked and matched with the push rod matching surface, so that the push rod is locked at a first position, and the movable iron core drives the counter-force spring to store energy; and when the magnetic flux release is in a second operation state, the movable iron core locking surface is separated from the push rod matching surface, and the counter-force spring releases energy to drive the push rod to be switched to a second position. The circuit breaker comprises a protection module. According to the protection module and the circuit breaker, the movable iron core locking surface used for locking the push rod is directly constructed on the movable iron core, and the push rod can be driven to trip the operating mechanism only through energy release of one reaction spring, so that the structure is simplified, the tripping action time is shorter, the tripping force is easier to calculate and control, and the tripping performance is more stable.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to a protection module and a circuit breaker. Background Technology

[0002] The flux trip unit in the existing circuit breaker has many parts and a complex assembly process. The flux trip unit is equipped with multiple torsion springs for linkage tripping, and the time from receiving the tripping signal to transmitting the tripping is relatively long. Its tripping force is also affected by the interaction between the various components, making it more difficult to control the tripping force.

[0003] In addition, existing circuit breakers also suffer from technical problems such as low integration and limited versatility. Summary of the Invention

[0004] The purpose of this invention is to overcome at least one defect of the prior art and to provide a protection module and a circuit breaker.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A protection module for protecting a conductive system includes a flux trip unit that switches between a first operating state and a second operating state based on the electrical parameters of the conductive system. The flux trip unit includes a fixed yoke, a coil frame mounted on the fixed yoke, a coil sleeved on the coil frame, a stationary iron core mounted within the coil frame, a movable iron core linearly disposed within the coil frame and opposite to the stationary iron core, and a push rod for driving a traction rod of an operating mechanism. The push rod is movable and can switch between a first position and a second position. In the second position, the push rod drives the traction rod to switch the operating mode of the operating mechanism. The movable iron core has a locking surface for locking with the push rod's mating surface. The flux trip unit also includes a reaction spring.

[0007] When the magnetic flux trip device is in the first operating state, the locking surface of the moving iron core and the mating surface of the push rod are locked together, so that the push rod is locked in the first position and cannot move to the second position. The moving iron core directly drives or indirectly drives the reaction spring to store energy through the push rod. When the magnetic flux trip device is in the second operating state, the locking surface of the moving iron core and the mating surface of the push rod are separated, and the reaction spring releases energy to drive the push rod to switch to the second position.

[0008] Optionally, in the direction in which the push rod moves from the first position to the second position, the locking surface of the moving iron core is located in front of the mating surface of the push rod; when the magnetic flux trip device is in the second operating state, the moving iron core moves in the direction in which the locking surface of the moving iron core moves away from the mating surface of the push rod.

[0009] Optionally, the push rod is linearly movable on one side of the moving iron core, and its moving direction is the same as that of the moving iron core. The push rod has a push rod mating part protruding towards the moving iron core on the side facing the moving iron core, and the side of the push rod mating part facing the locking surface of the moving iron core is the push rod mating surface.

[0010] Optionally, the push rod mating part is provided with a sliding notch that slides with the moving iron core, and the push rod mating part is slidably mounted on the moving iron core through the sliding notch.

[0011] Optionally, the side of the push rod mating part facing away from the locking surface of the moving iron core is the push rod working surface, and the reaction spring is sleeved on the moving iron core, with one end abutting against the push rod working surface and the other end abutting against the fixed magnetic yoke.

[0012] Optionally, one end of the reaction spring is connected to the push rod; when the magnetic flux trip device is in the first operating state, the moving iron core drives the reaction spring to store energy through the locking surface of the moving iron core and the mating surface of the push rod at intervals; when the magnetic flux trip device is in the second operating state, the reaction spring releases energy and directly drives the push rod to switch to the second position.

[0013] Optionally, the push rod extends along the direction of movement of the push rod at the end away from the traction rod to form a push rod guide portion, which is slidably disposed in the guide groove.

[0014] Optionally, the magnetic flux release device further includes a conical spring connected between the push rod and the moving iron core; when the push rod moves from the second position to the first position, the push rod drives the moving iron core to reset through the conical spring.

[0015] Optionally, the moving iron core is provided with a moving iron core abutment surface opposite to the moving iron core locking surface. In the direction of movement of the push rod, the push rod mating surface is located between the moving iron core locking surface and the moving iron core abutment surface. The conical spring is sleeved on the moving iron core, with one end abutting against the moving iron core abutment surface and the other end abutting against the push rod action surface located between the push rod mating surface and the moving iron core abutment surface on the push rod.

[0016] Optionally, the push rod is provided with a push rod driving part for cooperating with the traction rod drive and a push rod driven part for being driven by the rocker arm of the operating mechanism. In the direction in which the push rod moves from the first position to the second position, the push rod driven part is located in front of the push rod driving part.

[0017] Optionally, the protection module includes a bracket, an electronic protection mechanism, and a backup protection mechanism. The bracket has a first mounting portion and a second mounting portion spaced apart in its height direction. The electronic protection mechanism includes the magnetic flux trip unit, which is mounted on the first mounting portion. The backup protection mechanism is mounted on the second mounting portion and can drive the traction rod to move.

[0018] The operating mechanism includes an actuating mechanism and a traction rod rotatably mounted on the actuating mechanism. The traction rod has a first impact portion and a second impact portion spaced apart in the height direction of the bracket. The push rod of the magnetic flux trip device is used to impact the first impact portion. The backup protection mechanism is equipped with an impact rod for impacting the second impact portion. The traction rod moves when the push rod impacts the first impact portion and / or when the impact rod impacts the second impact portion.

[0019] Optionally, the second mounting part is a mounting base with a through cavity integrally formed with the bracket, and the backup protection mechanism is installed in the through cavity.

[0020] Optionally, the backup protection mechanism includes an impact rod, a rotating armature, a fixed iron core, a rotating shaft, and a torsion spring. The impact rod is fixed on the rotating armature, the fixed iron core is fixed on the mounting base, and the rotating armature is rotatably mounted on the mounting base via the rotating shaft, opposite to the fixed iron core. The mounting base has rotating shaft holes on both sides that mate with the two ends of the rotating shaft. One end of the torsion spring is fixed on the rotating armature, and the other end of the torsion spring is fixed on the mounting base or the fixed iron core.

[0021] Optionally, the rotating armature is provided with a spring fixing hole; the mounting base is provided with two partitions located on both sides, the two partitions are respectively arranged parallel to the two side walls of the mounting base, the partitions are integrally connected to the side walls of the mounting base through a bent connecting part, and a fixing hook is provided on the inner side of one of the partitions; the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is inserted into the spring fixing hole, and the other end of the torsion spring is attached to the fixing hook.

[0022] Optionally, the electronic protection mechanism further includes a current transformer, which and the backup protection mechanism are installed on opposite sides of the bracket in the horizontal direction; the bracket is provided with a plurality of limiting posts extending in the horizontal direction of the bracket, which are arranged around to form a limiting cavity adapted to the current transformer, and at least one limiting post is provided with an inwardly protruding latching part for locking the side of the current transformer away from the backup protection mechanism.

[0023] Optionally, the first mounting part is a mounting cavity with an opening integrally formed with the bracket, and the magnetic flux trip unit is installed in the mounting cavity; the electronic protection mechanism further includes a mounting plate and a control board electrically connected to the magnetic flux trip unit, the mounting plate covers the opening and is connected to the bracket; the control board is installed on the side of the mounting plate opposite to the magnetic flux trip unit; the magnetic flux trip unit has a pin; the mounting plate has a clearance hole, and the pin extends out of the mounting plate through the clearance hole and is electrically connected to the control board.

[0024] A circuit breaker includes a base, a contact system, an operating mechanism, and a protection module as described in any one of the above. The support of the protection module is mounted on the base. The operating mechanism cooperates with the contact system, and the contact system and the operating mechanism are mounted on the base on the same side of the support.

[0025] The protection module and circuit breaker of the present invention directly construct a moving iron core locking surface for locking the push rod on the moving iron core, and the push rod can be driven to release the operating mechanism by releasing energy through only a single reaction spring. There is no need to set up an additional locking component for locking the push rod, which reduces the number of transmission stages between the moving iron core and the push rod, and also eliminates the need for multiple elastic components. This simplifies the structure of the magnetic flux trip device, resulting in a shorter tripping time, easier calculation and control of the tripping force, and more stable tripping performance.

[0026] In addition, the locking structure between the moving iron core and the push rod is simple, stable and reliable. When the moving iron core is attracted, it can directly lock the push rod, and when the moving iron core is pushed away, it will automatically unlock. The design is ingenious and practical.

[0027] Furthermore, by mounting both the electronic protection mechanism and the backup protection mechanism on the bracket, the protection module is integrated, reducing space usage. At the same time, the existing operating mechanism, in which the traction rod is mounted on the actuating mechanism, is not changed, thus improving the versatility of the protection module. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the circuit breaker base portion of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the operating mechanism, protection module, contact system, and conductive system of the present invention;

[0030] Figure 3 This is a structural schematic diagram of the bracket, backup protection mechanism, and traction rod of the present invention;

[0031] Figure 4 This is an exploded view of the protection module of this invention;

[0032] Figure 5 This is an assembly drawing of the magnetic flux trip device of the present invention;

[0033] Figure 6 This is an exploded view of the magnetic flux trip device of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the bracket of the present invention;

[0035] Figure 8 This is a schematic diagram of the mounting plate of the present invention;

[0036] Bracket 1; Mounting cavity 11; Limiting step 111; First limiting surface 111a; Second limiting surface 111b; Mounting seat 12; Through cavity 120; Rotary shaft hole 121; Partition plate 122; Bending connection part 123; Fixing hook 124; Limiting post 13; Buckling part 131; Magnetic flux release device 2; Push rod 21; Push rod mating part 211; Push rod mating surface 211a; Push rod working surface 211b; Sliding notch 211c; Push rod guide part 212; Push rod drive part 213; Push rod driven part 214; Moving iron core 22; Moving iron core locking surface 221; Moving iron core abutment Surface 222; Coil positioning plate 23; Fixed magnetic yoke 24; Fourth limiting surface 241; Coil 25; Coil frame 26; Reaction spring 27; Conical spring 28; Pin 29; Current transformer 3; Mounting plate 4; Clearance hole 41; Third limiting surface 42; Control plate 5; Operating mechanism 6; Rocker arm 61; Traction rod 62; First impact part 621; Second impact part 622; Backup protection mechanism 7; Impact rod 71; Rotating armature 72; Spring fixing hole 721; Fixed iron core 73; Rotating shaft 74; Torsion spring 75; Conductive system 8; Base 9; Contact system 10. Detailed Implementation

[0037] The specific embodiments of the protection module and circuit breaker of the present invention are further illustrated below with reference to the accompanying drawings. The protection module and circuit breaker of the present invention are not limited to the descriptions in the following embodiments.

[0038] like Figure 1 and Figure 2As shown, the circuit breaker in this embodiment includes a base 9, a contact system 10, an operating mechanism 6, and a protection module. The contact system 10 has an open state (disconnecting the conductive system 8) and an on state (connecting the conductive system 8). The contact system 10 includes a moving contact and a stationary contact. The operating mechanism 6 cooperates with the contact system 10, and is connected to the moving contact of the contact system 10. The operating mechanism 6 drives the moving contact to swing and contact and separate from the stationary contact, performing closing and opening operations. The operating mechanism 6 typically includes a linkage structure of a latching latch and a trip latch, which is a four-bar or five-bar linkage structure. The linkage structure is connected to the moving contact. The operating mechanism 6 has a disengaged state and a re-engaged state. When the operating mechanism 6 is in the re-engaged state, that is, when the latch and trip latch are latched together, the linkage structure can drive the moving contact to swing. The operating mechanism 6, in the re-engaged state, can drive the contact system 10 to conduct the conductive system 8, allowing the operating mechanism 6 to perform closing and opening operations. When the operating mechanism 6 is in the disengaged state, that is, when the latch and trip latch are released from their latching engagement, the moving contact and stationary contact of the linkage structure separate, causing the contact system 10 to disconnect the conductive system 8. At this time, the operating mechanism 6 cannot drive the moving contact to perform a closing operation; the latch and trip latch need to be re-latched together to enter the re-engaged state. The operating mechanism 6 includes an actuating mechanism and a traction rod 62 rotatably mounted on the actuating mechanism. The traction rod 62 is used to switch the operating mode of the operating mechanism 6. The tripping state and the re-tripping state of the operating structure 6 are switched by the protection module driving the traction rod 62. That is, the protection module drives the traction rod 62 directly or indirectly to move the latch, releasing the latch from the tripping engagement, so that the operating structure 6 enters the tripping state from the re-tripping state. The protection module is used to protect the conductive system 8. When a fault is detected in the main circuit where the contact system 10 and the conductive system 8 are located, the protection module drives the traction rod 62. The protection module can realize overload, short circuit, leakage current and / or overvoltage protection. In this embodiment, the protection module includes an electronic protection mechanism and a backup protection mechanism 7. Both the electronic protection mechanism and the backup protection mechanism 7 have a tripping component. Under the action of external force, the tripping component drives the traction rod 62, so that the operating mechanism 6 of the circuit breaker in the closing state switches from the re-tripping state to the tripping state. At the same time, the operating mechanism 6 drives the moving contact to separate from the stationary contact, and the circuit breaker trips and opens. When the operating mechanism 6 is in the tripped state, the handle can be used to move the operating mechanism 6 in the opening direction, which can cause the latch and trip latch to re-engage and enter the re-engagement state. It should be noted that both the electronic protection mechanism and the backup protection mechanism 7 are used to drive the movement of the traction rod 62. In terms of execution, the two complement each other and do not interfere with each other.

[0039] It should be noted that the operating mechanism 6 is an existing technology, typically including a frame, handle, rocker arm 61, energy storage spring, connecting rod, crank, latch and jumper connected by a latch. The frame is mounted on the base 9, the rocker arm 61 is rotatably mounted on the frame, the jumper, latch and traction rod 62 are respectively rotatably mounted on the frame, the latch is latched to the jumper, the traction rod 62 is limited to the latch, the crank is rotatably mounted on the jumper through the crank shaft, one end of the connecting rod is rotatably connected to the crank through the spring shaft, and the other end is directly or indirectly connected to the moving contact of the contact system 10 to drive the moving contact of the contact system 10 to rotate, one end of the energy storage spring is connected to the rocker arm 61, and the other end is connected to the spring shaft at the connection between the connecting rod and the crank. The rocker arm 61, crank, latch, jumper, connecting rod, and energy storage spring constitute the linkage structure of the operating mechanism. The latch and jumper restrict the rotation position of the crank, allowing the crank to rotate around the jumper as the rotation center. The handle drives the rocker arm 61 to swing, and the rocker arm 61 drives the crank and connecting rod to rotate. In turn, the connecting rod drives the contact system 10 to rotate and connect and disconnect the conductive system 8, thereby realizing the closing and opening of the circuit breaker.

[0040] like Figures 2-6 As shown, the electronic protection mechanism of this embodiment includes a flux trip unit 2, which switches between a first operating state and a second operating state based on the electrical parameters of the conductive system 8. It should be noted that the electrical parameters can be voltage or current. For example, when the voltage exceeds a preset voltage threshold, the flux trip unit 2 drives the traction rod 62 to switch the operating mechanism 6 from a re-clamping state to a tripped state; or when the current exceeds a preset threshold, the electronic module drives the traction rod 62 to switch the operating mechanism 6 from a re-clamping state to a tripped state. When the operating mechanism 6 is in the re-clamping state, the circuit breaker can perform opening and closing operations.

[0041] The magnetic flux trip device 2 of this embodiment includes a fixed magnetic yoke 24, a coil frame 26 mounted on the fixed magnetic yoke 24, a coil 25 sleeved on the coil frame 26, a stationary iron core (not shown in the figure) mounted inside the coil frame 26, a moving iron core 22 linearly disposed within the coil frame 26 and opposite to the stationary iron core, and a push rod 21 serving as a tripping element of the electronic protection mechanism. The fixed magnetic yoke 24 may include multiple magnetic yoke pieces, which are connected as a whole by riveting, threading, or snap-fitting. The fixed magnetic yoke 24 forms an installation space for mounting the coil frame 26 with the coil 25 and the stationary iron core, thereby protecting the coil 25, the coil frame 26, and the stationary iron core. A coil positioning plate 23 is also provided in the installation space, and the coil positioning plate 23 has a coil positioning hole through which the coil 25 can pass. The push rod 21 is movable and can switch between a first position and a second position. When the push rod 21 is in the second position, it drives the traction rod 62 to switch the operating mode of the operating mechanism 6.

[0042] One improvement of this application is that the moving iron core 22 is provided with a moving iron core locking surface 221 for locking with the push rod mating surface 211a of the push rod 21, and the magnetic flux release device 2 also includes a reaction spring 27. In this embodiment, the stationary iron core is a permanent magnet. Figure 5 and Figure 6 As shown, when the magnetic flux trip device 2 is in the first operating state, the moving iron core 22 is attracted to the stationary iron core, so that the locking surface 221 of the moving iron core and the mating surface 211a of the push rod are locked together, and the push rod 21 is locked in the first position and cannot move to the second position. The moving iron core 22 directly drives or indirectly drives the reaction spring 27 to store energy through the push rod 21. When the magnetic flux trip device 2 is in the second operating state, the electromagnetic field generated by the energization of the coil 25 cancels the magnetic field of the stationary iron core, causing the moving iron core 22 to move forward and repel the stationary iron core. As a result, the locking surface 221 of the moving iron core and the mating surface 211a of the push rod are separated, and the reaction spring 27 releases energy to drive the push rod 21 to switch forward to the second position. In this embodiment, the protection module directly constructs a moving iron core locking surface 221 on the moving iron core 22 for locking the push rod 21. The push rod 21 can be driven to disengage the operating mechanism simply by releasing energy through a single reaction spring 27, eliminating the need for additional locking components for the push rod 21. This reduces the number of transmission stages between the moving iron core 22 and the push rod 21, and also eliminates the need for multiple elastic components, simplifying the structure of the flux trip device 2. This results in a shorter tripping time, easier calculation and control of the tripping force, and more stable tripping performance. It should be noted that the working principle of the flux trip device 2 is existing technology. Alternatively, in other embodiments, the stationary iron core may not be a permanent magnet. When the flux trip device 2 is energized, it enters a first operating state where the electromagnetic field generated by the energized coil 25 attracts the moving iron core 22 to the stationary iron core. When the flux trip device 2 is de-energized, it enters a second operating state where the moving iron core 22 repels the stationary iron core.

[0043] Furthermore, in the direction in which the push rod 21 moves from the first position to the second position, the moving iron core locking surface 221 is located in front of the push rod mating surface 211a; when the magnetic flux trip device 2 is in the second operating state, the moving iron core 22 moves in the direction in which the moving iron core locking surface 221 moves away from the push rod mating surface 211a. The moving iron core locking surface 221 directly blocks the push rod mating surface 211a, thus locking the push rod 21 and preventing it from moving towards the traction rod 62. The moving iron core 22 pushes forward, causing the moving iron core locking surface 221 to move away from the push rod mating surface 211a, thus unlocking the push rod 21. The movable gap between the moving iron core locking surface 221 and the push rod mating surface 211a is sufficient for the push rod 21 to drive the traction rod 62. The locking structure between the moving iron core 22 and the push rod 21 is simple, stable, and reliable. The moving iron core 22 engaging directly locks the push rod 21, and the moving iron core 22 pushing away automatically unlocks it. The design is ingenious and practical.

[0044] Specifically, the push rod 21 is linearly movable on one side of the moving iron core 22, and its moving direction is the same as that of the moving iron core 22. The push rod 21 has a push rod mating part 211 protruding towards the moving iron core 22 on the side facing the moving iron core 22. The side of the push rod mating part 211 facing the moving iron core locking surface 221 is the push rod mating surface 211a. The push rod mating part 211 has a sliding notch 211c that slides with the moving iron core 22, and the push rod mating part 211 is slidably mounted on the moving iron core 22 through the sliding notch 211c. At the end of the push rod 21 away from the traction rod 62, it extends along the movement direction of the push rod 21 to form a push rod guide part 212, which is slidably mounted in a guide groove.

[0045] like Figure 5 and Figure 6 As shown, in this embodiment, the installation structure of the reaction spring 27 is such that one end of the reaction spring 27 is movable and connected to the push rod 21, while the other end of the reaction spring 27 is fixed, meaning it can be connected to a non-movable part at a reasonable position. When the magnetic flux trip device 2 is in the first operating state, the moving iron core 22 drives the reaction spring 27 to store energy through the moving iron core locking surface 221 and the push rod mating surface 211a. When the magnetic flux trip device 2 is in the second operating state, the reaction spring 27 releases energy and directly drives the push rod 21 to switch to the second position. Specifically, the side of the push rod mating part 211 facing away from the moving iron core locking surface 221 is the push rod acting surface 211b. The reaction spring 27 is sleeved on the moving iron core 22, with one end abutting against the push rod acting surface 211b and the other end abutting against the fixed magnetic yoke 24. The layout is compact and reasonable, which is conducive to the miniaturization design of the magnetic flux trip device 2, and the components will not interfere with each other. Of course, in other embodiments, the movable end of the reaction spring 27 can be connected to the moving iron core 22; when the magnetic flux trip device 2 is in the first operating state, the moving iron core 22 directly drives the reaction spring 27 to store energy; when the magnetic flux trip device 2 is in the second operating state, the reaction spring 27 releases energy and indirectly drives the push rod 21 to switch to the second position through the moving iron core 22.

[0046] like Figure 3 and Figure 6As shown, the structure between the push rod 21 and the operating mechanism 6 in this embodiment includes a push rod driving part 213 for driving cooperation with the traction rod 62 and a push rod driven part 214 for being driven by the rocker arm 61 of the operating mechanism 6. In the direction in which the push rod 21 moves from the first position to the second position, the push rod driven part 214 is located in front of the push rod driving part 213. Preferably, the push rod driving part 213 is a protrusion on the opposite side of the push rod cooperating part 211 on the push rod 21. When the push rod 21 moves from the first position to the second position, the push rod driving part 213 pushes the traction rod 62 to disengage the operating mechanism 6; when the operating mechanism 6 moves in the opening direction to re-engage, the rocker arm 61 pushes the push rod driven part 214 to separate the push rod driving part 213 from the traction rod 62.

[0047] like Figure 5 and Figure 6 As shown, the magnetic flux trip device 2 in this embodiment also includes a conical spring 28 connected between the push rod 21 and the moving iron core 22. When the push rod 21 moves from the second position to the first position, the push rod 21 drives the moving iron core 22 to reset via the conical spring 28. When the operating mechanism 6 moves in the opening direction to re-engage the operating mechanism 6, the rocker arm 61 pushes the push rod driven part 214 to move the push rod 21 from the second position to the first position. The push rod 21 drives the moving iron core 22 to re-engage with the stationary iron core via the conical spring 28. Specifically, the moving iron core 22 is provided with a moving iron core abutment surface 222 opposite to the moving iron core locking surface 221. In the direction of movement of the push rod 21, the push rod mating surface 211a is located between the moving iron core locking surface 221 and the moving iron core abutment surface 222. The conical spring 28 is sleeved on the moving iron core 22, with one end abutting against the moving iron core abutting surface 222 and the other end abutting against the push rod 21 on the push rod action surface 211b located between the push rod mating surface 211a and the moving iron core abutting surface 222. Preferably, the smaller diameter end of the conical spring 28 abuts against the moving iron core abutting surface 222, and the larger diameter end of the conical spring 28 abuts against the push rod action surface 211b, making the conical spring 28 more stable.

[0048] Another improvement of this application is that, Figures 1-4As shown, the protection module of this embodiment also includes a bracket 1, which is mounted on the base 9. The contact system 10 and the operating mechanism 6 are mounted on the base 9 and located on the same side of the bracket 1. The bracket 1 has a first mounting portion and a second mounting portion spaced apart in its height direction. The electronic protection mechanism includes the magnetic flux trip device 2, which is mounted on the first mounting portion. The backup protection mechanism 7 is mounted on the second mounting portion. The traction rod 62 has a first impact portion 621 and a second impact portion 622 spaced apart in the height direction of the bracket 1. The push rod 21 of the magnetic flux trip device 2 is used to impact the first impact portion 621. The backup protection mechanism 7 is equipped with an impact rod 71 for impacting the second impact portion 622, that is, the impact rod 71 is the tripping element of the backup protection mechanism 7. When the push rod 21 impacts the first impact portion 621 and / or the impact rod 71 impacts the second impact portion 622, the traction rod 62 moves. In this embodiment, the protection module integrates the electronic protection mechanism and the backup protection mechanism 7 onto the bracket 1, reducing the space occupied. At the same time, it does not change the existing operation mechanism 6, where the traction rod 62 is installed on the actuation mechanism, thus improving the versatility of the protection module.

[0049] like Figure 3 , Figure 4 and Figure 7 As shown in the figure, in this embodiment, the installation structure of the backup protection mechanism 7 is such that the second mounting part is a mounting base 12 with a through cavity 120 integrally formed with the bracket 1, and the backup protection mechanism 7 is installed in the through cavity 120. The backup protection mechanism 7 is directly fixed in the mounting base 12 on the bracket 1, simplifying the assembly process. Specifically, the backup protection mechanism 7 includes an impact rod 71, a rotating armature 72, a fixed iron core 73, a rotating shaft 74, and a torsion spring 75. The impact rod 71 is fixed on the rotating armature 72, and the fixed iron core 73 is fixed on the mounting base 12. The rotating armature 72 is rotatably mounted on the mounting base 12 via the rotating shaft 74 and is positioned opposite to the fixed iron core 73. The mounting base 12 has rotating shaft holes 121 on both sides that mate with the two ends of the rotating shaft 74. One end of the torsion spring 75 is fixed on the rotating armature 72, and the other end of the torsion spring 75 is fixed on the mounting base 12 or the fixed iron core 73.

[0050] The conductive system 8 passes through the cavity 120. When the current generated by the conductive system 8 is sufficient to magnetize the fixed iron core 73 and generate a strong magnetic field, the rotating armature 72 generates an electromagnetic force under the action of the magnetic field. This electromagnetic force can overcome the resistance of the torsion spring 75, causing the rotating armature 72 to rotate, thereby driving the impact rod 71 to move and trigger the drive traction rod 210 to move and disengage. When the current decreases, the magnetic field strength generated by the fixed iron core 73 weakens, and the rotating armature 72 is driven by the torsion spring 75 to drive the impact rod 71 to disengage from the traction rod 62, causing the traction rod 62 to reset.

[0051] Preferably, the rotating armature 72 and the fixed core 73 are U-shaped structures, arranged opposite each other with their openings facing each other. The end of the rotating armature 72 away from the fixed core 73 is provided with a spring fixing hole 721. The two arms of the rotating armature 72 are provided with through holes through which the rotating shaft 74 can pass. The mounting base 12 is provided with two partitions 122 located on both sides. The two partitions 122 are respectively arranged parallel to the two side walls of the mounting base 12. The partitions 122 are integrally connected to the side walls of the mounting base 12 by a bent connecting part 123. A fixing hook 124 is provided on the inner side of one partition 122. One arm of the rotating armature 72 and one arm of the fixed core 73 are arranged vertically opposite each other between one partition 122 and one side wall of the mounting base 12. The other arm of the rotating armature 72 and the other arm of the fixed core 73 are arranged vertically opposite each other between the other partition 122 and the other side wall of the mounting base 12. In the height direction of bracket 1, the rotating shaft 74 is located between the end of the rotating armature 72 away from the fixed iron core 73 and the partition plate 72; the torsion spring 75 is sleeved on the rotating shaft 74, one end of the torsion spring 75 is inserted into the spring fixing hole 721 of the rotating armature 72, and the other end of the torsion spring 75 is attached to the fixing hook 124 of the mounting base 12. The fixing position and fixing structure of the lever arm at both ends of the torsion spring 75 are optimized so that the lever arm of the torsion spring 75 is not easy to fall out when the backup protection mechanism 7 is activated, and the fixing position of the lever arm at both ends of the torsion spring 75 is close to the installation position of the torsion spring 75 (rotating shaft 74), so that the length of the lever arm at both ends of the torsion spring 75 is not limited, thus improving versatility.

[0052] like Figure 2 and Figure 4As shown, the electronic protection mechanism in this embodiment also includes a current transformer 3. The current transformer 3 and the backup protection mechanism 7 are installed on opposite sides of the bracket 1 in the horizontal direction. The conductive system 8 passes through the central hole of the current transformer 3, then through the through cavity 120 of the bracket 1, and connects to the contact system 10. The bracket 1 is provided with a plurality of limiting posts 13 extending in the horizontal direction of the bracket 1. The plurality of limiting posts 13 are arranged around to form a limiting cavity adapted to the current transformer 3, and at least one limiting post 13 is provided with an inwardly protruding latching part 131 for fastening the side of the current transformer 3 away from the backup protection mechanism 7. The use of a plurality of limiting posts 13 arranged around to fix the current transformer 3 is simple in structure, easy and firm to install, and also conducive to heat dissipation.

[0053] like Figures 4-7 As shown, in this embodiment, the electronic protection mechanism has an installation structure in which the first installation part is an installation cavity 11 integrally formed with the bracket 1 and has an opening. The magnetic flux trip unit 2 is installed in the installation cavity 11. The electronic protection mechanism also includes an installation plate 4 and a control plate 5 electrically connected to the magnetic flux trip unit 2. The installation plate 4 covers the opening and is connected to the bracket 1. The control plate 5 is installed on the side of the installation plate 4 away from the magnetic flux trip unit 2. The coil frame 26 of the magnetic flux trip unit 2 has a pin 29. The installation plate 4 has a clearance hole 41, and the pin 29 extends out of the installation plate 4 through the clearance hole 41 and is electrically connected to the control plate 5.

[0054] like Figure 2 As shown, the current transformer 3 is electrically connected to the control board 5 and is used to collect the electrical parameters to detect faults such as overload, short circuit, undervoltage, and overvoltage. The flux trip unit 2 is electrically connected to the control board 5; the control board 5 is configured to control the flux trip unit 2 to switch between a first operating state and a second operating state based on the electrical parameters; wherein, when the flux trip unit 2 is in the first operating state, the operating mechanism 6 is in the re-tightening state; when the flux trip unit 2 is in the second operating state, the operating mechanism 6 is driven to trip, causing the operating mechanism 6 to enter the tripping state. It should be noted that the conductive system 8 passes through the current transformer 3, causing the current transformer 3 to generate an induced current or induced voltage. The induced current or induced voltage is transmitted to the control board 5. The control board 5 compares the obtained induced current with a current threshold or the induced voltage with a voltage threshold to determine whether to output a tripping signal to the flux trip unit 2.

[0055] like Figures 6-8As shown in the figure, the specific structure of the guide groove for the guide push rod 21 in this embodiment is as follows: the mounting cavity 11 of the bracket 1 is provided with a limiting step 111. The limiting step 111 has a first limiting surface 111a that is opposite to the mounting plate 4 and a second limiting surface 111b that is opposite to the fixed magnetic yoke 24. The mounting plate 4 is provided with a third limiting surface 42. The fixed magnetic yoke 24 is provided with a fourth limiting surface 241 on the side facing the limiting step 111. The first limiting surface 111a, the second limiting surface 111b, the third limiting surface 42 and the fourth limiting surface 241 surround and form the guide groove.

[0056] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0057] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A protection module for protecting a conductive system (8), comprising a flux trip unit (2), wherein the flux trip unit (2) switches between a first operating state and a second operating state based on the electrical parameters of the conductive system (8), the flux trip unit (2) comprising a fixed yoke (24), a coil frame (26) mounted on the fixed yoke (24), a coil (25) fitted on the coil frame (26), a stationary iron core mounted in the coil frame (26), a moving iron core (22) linearly disposed in the coil frame (26) and disposed opposite to the stationary iron core, and a push rod (21) for driving a traction rod (62) of an operating mechanism (6), wherein the push rod (21) is movable and can switch between a first position and a second position, and the push rod (21) drives the traction rod (62) in the second position to switch the operating mode of the operating mechanism (6), characterized in that: The moving iron core (22) is provided with a moving iron core locking surface (221) for locking with the push rod mating surface (211a) of the push rod (21). The magnetic flux release device (2) also includes a reaction spring (27). When the magnetic flux trip device (2) is in the first operating state, the locking surface (221) of the moving iron core and the mating surface (211a) of the push rod are locked together, so that the push rod (21) is locked in the first position and cannot move to the second position. The moving iron core (22) directly drives or indirectly drives the reaction spring (27) through the push rod (21) to store energy. When the magnetic flux trip device (2) is in the second operating state, the locking surface (221) of the moving iron core and the mating surface (211a) of the push rod are separated, and the reaction spring (27) releases energy to drive the push rod (21) to switch to the second position.

2. The protection module according to claim 1, characterized in that: In the direction in which the push rod (21) moves from the first position to the second position, the moving iron core locking surface (221) is located in front of the push rod mating surface (211a); when the magnetic flux trip device (2) is in the second operating state, the moving iron core (22) moves in the direction in which the moving iron core locking surface (221) moves away from the push rod mating surface (211a).

3. The protection module according to claim 2, characterized in that: The push rod (21) is linearly movable on one side of the moving iron core (22), and its moving direction is the same as that of the moving iron core (22). The push rod (21) has a push rod mating part (211) protruding towards the moving iron core (22) on the side facing the moving iron core (22). The side of the push rod mating part (211) facing the moving iron core locking surface (221) is the push rod mating surface (211a).

4. The protection module according to claim 3, characterized in that: The push rod mating part (211) is provided with a sliding notch (211c) that slides with the moving iron core (22). The push rod mating part (211) is slidably disposed on the moving iron core (22) through the sliding notch (211c).

5. The protection module according to claim 4, characterized in that: The push rod mating part (211) has a push rod working surface (211b) on the side opposite to the moving iron core locking surface (221). The reaction spring (27) is sleeved on the moving iron core (22), with one end abutting against the push rod working surface (211b) and the other end abutting against the fixed magnetic yoke (24).

6. The protection module according to claim 1, characterized in that: One end of the reaction spring (27) is connected to the push rod (21); when the magnetic flux trip device (2) is in the first operating state, the moving iron core (22) drives the reaction spring (27) to store energy through the moving iron core locking surface (221) and the push rod mating surface (211a) at intervals; when the magnetic flux trip device (2) is in the second operating state, the reaction spring (27) releases energy and directly drives the push rod (21) to switch to the second position.

7. The protection module according to claim 1, characterized in that: The push rod (21) extends along the direction of movement of the push rod (21) at the end away from the traction rod (62) to form a push rod guide (212), which is slidably disposed in the guide groove.

8. The protection module according to any one of claims 1-7, characterized in that: The magnetic flux release device (2) also includes a conical spring (28) connected between the push rod (21) and the moving iron core (22); when the push rod (21) moves from the second position to the first position, the push rod (21) drives the moving iron core (22) to reset through the conical spring (28).

9. The protection module according to claim 8, characterized in that: The moving iron core (22) is provided with a moving iron core abutment surface (222) opposite to the moving iron core locking surface (221). In the direction of movement of the push rod (21), the push rod mating surface (211a) is located between the moving iron core locking surface (221) and the moving iron core abutment surface (222). The conical spring (28) is sleeved on the moving iron core (22), with one end abutting against the moving iron core abutment surface (222) and the other end abutting against the push rod action surface (211b) on the push rod (21) located between the push rod mating surface (211a) and the moving iron core abutment surface (222).

10. A circuit breaker, characterized in that: The device includes a base (9), a contact system (10), an operating mechanism (6), and a protection module as described in any one of claims 1 to 16, wherein a bracket (1) of the protection module is mounted on the base (9); the operating mechanism (6) cooperates with the contact system (10), and the contact system (10) and the operating mechanism (6) are mounted on the base (9) on the same side of the bracket (1).

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