Self-locking device of magnetic control type circuit breaker and magnetic control type circuit breaker

Abstract

A self-locking device of a magnetic control type circuit breaker comprises a fixing frame. The electromagnetic mechanism comprises a limiting rod and a movable iron core; the locking assembly comprises a rolling shaft; the tripping assembly comprises an ejector rod and an ejector rod spring; the push rod spring is used for driving the push rod to push the rolling shaft to move to a switching-on position, so that the rolling shaft is matched with the limiting rod in a hasp mode to prevent the movable iron core from moving in the switching-off direction. And the ejector rod is used for rotating under external force to unlock the rolling shaft, so that the rolling shaft and the limiting rod are released from the hasp, and the movable iron core can move towards the opening direction. The magnetic control type circuit breaker comprises the self-locking device of the magnetic control type circuit breaker. The utility model relates to the field of low-voltage electric appliances, in particular to a self-locking device of a magnetic control type circuit breaker and the magnetic control type circuit breaker, a push rod spring drives a push rod to push a rolling shaft and a limiting rod hasp to realize closing and locking, and the push rod relieves locking of the rolling shaft to enable the rolling shaft and the limiting rod to release the hasp to realize unlocking and opening. The circuit breaker can be quickly and reliably switched on, and can be quickly and reliably switched off with small tripping force.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a self-locking device of a magnetically controlled circuit breaker and the magnetically controlled circuit breaker. Background Art

[0002] Traditional circuit breakers mainly use multi-link mechanisms for opening and closing operations. Multi-link mechanisms have many parts, complex structures, and large operating impact, resulting in poor reliability and short life. At the same time, the closing speed is slow and cannot meet the fast closing requirements required in new energy application scenarios.

[0003] Conventional circuit breakers also use magnetic control mechanisms for opening and closing. These mechanisms offer the advantages of simple structure and reliable operation. Their self-locking mechanism is crucial, ensuring rapid and reliable closing and quick tripping in the event of a fault. Furthermore, the required tripping force is low, avoiding burdening the trip actuator, which would otherwise increase its size and power. Utility Model Content

[0004] The purpose of the present utility model is to overcome at least one defect of the prior art and to provide a self-locking device for a magnetically controlled circuit breaker and a magnetically controlled circuit breaker.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Self-locking device of magnetically controlled circuit breaker, including

[0007] Fixed frame;

[0008] The electromagnetic mechanism comprises a limit rod and a movable iron core, wherein the limit rod is fixedly connected to the movable iron core;

[0009] The locking assembly includes a roller disposed on a fixed frame, the roller being capable of performing circular motion about a first rotation center a to switch between a closed position and an open position;

[0010] A release assembly includes a push rod and a push rod spring, wherein the push rod is rotatable around a second rotation center b and is arranged on a fixed frame;

[0011] Among them, the push rod spring is used to drive the push rod to push the roller to the closing position, so that the roller and the limit rod are buckled to prevent the moving iron core from moving in the opening direction; the push rod is used to be rotated by external force to release the lock on the roller, so that the roller and the limit rod are released, so that the moving iron core can move in the opening direction.

[0012] Optionally, the electromagnetic mechanism also includes a striking rod, and the end of the limiting rod away from the moving iron core is fixedly connected to the striking rod, and the striking rod is used to drive the push rod to push the roller to move toward the closing position when the limiting rod moves in the closing direction with the moving iron core.

[0013] Optionally, the limit rod is provided with a buckle surface and a limit surface, the buckle surface is used to buckle with the roller located in the closing position, and is used to push the roller to the opening position when the limit rod moves with the moving iron core in the opening direction, so that the limit surface can lock the roller in the opening position, so that the roller keeps the push rod spring in the energy storage state through the push rod.

[0014] Optionally, the buckle surface is perpendicular to the movement direction of the limit rod, and the buckle surface is vertically connected to the limit surface, and the roller located in the closing position is blocked on the path of the buckle surface moving in the opening direction; in the process of the limit rod moving the moving iron core in the opening direction, the buckle surface of the limit rod pushes the roller to roll onto the limit surface.

[0015] Optionally, the first rotation center a and the second rotation center b are parallel and perpendicular to the movement direction of the limit rod; the fixed frame includes two mounting plates spaced apart along the first rotation center a, and an installation space is enclosed between the two mounting plates. The end of the limit rod away from the moving iron core extends into the installation space, and the roller and the top rod are respectively installed in the installation space, wherein the first rotation center a of the roller is located on the path of the limit rod moving in the direction of opening the gate, and the second rotation center b of the top rod is located on one side of the limit rod.

[0016] Optionally, the locking assembly also includes a linkage shaft, two connecting rods and two hinge shafts. The mounting plate is provided with a movable hole corresponding to the linkage shaft and a hinge shaft hole corresponding to the hinge shaft. The roller is sleeved on the middle part of the linkage shaft. The two ends of the linkage shaft respectively pass through the movable holes of the two mounting plates and are hinged to one end of the two connecting rods. The other ends of the two connecting rods are respectively hinged to the outer sides of the two mounting plates through two hinge shafts. The two hinge shafts are coaxially arranged, and the first rotation center a is the axis center of the hinge shaft.

[0017] Optionally, the movable hole has a stop side wall, and when the roller is in the closing position, the stop side wall abuts the linkage shaft.

[0018] Optionally, the push rod includes a push rod rotating part, which is rotatably arranged on a fixed frame through a push rod rotating shaft, and the second rotation center b is the axis of the push rod rotating shaft. The push rod rotating part is radially extended with a trigger arm for receiving external force and a trip arm cooperating with the roller, and the trip arm has a first abutment surface and a second abutment surface connected to each other, the first abutment surface is used to abut the roller located in the open position, and the second abutment surface is used to abut the roller located in the closed position.

[0019] Optionally, a stop arm is provided on the fixing frame, and when the roller is located at the closing position, the stop arm abuts the first abutting surface of the tripping arm.

[0020] Optionally, the electromagnetic mechanism further includes a moving iron core spring, and when the roller and the limit rod are released from the buckle, the moving iron core can move in the opening direction under the drive of the moving iron core spring.

[0021] Optionally, the electromagnetic mechanism also includes a static iron core, a guide tube, a skeleton and a coil installed in the outer shell, the coil is sleeved on the skeleton, the guide tube is arranged in the axial hole of the skeleton, the static iron core is fixed in one end of the guide tube, the moving iron core is slidably arranged in the other end of the guide tube and is arranged opposite to the static iron core, the end of the moving iron core away from the static iron core is fixedly connected to one end of the limiting rod, the other end of the limiting rod passes through the outer shell and is arranged corresponding to the roller, and the moving iron core spring is sleeved on the sliding shaft and connected between the moving iron core and the static iron core.

[0022] A magnetically controlled circuit breaker includes a rotating shaft system and a protective mechanism, wherein the rotating shaft system is provided with at least one moving contact, and further includes a self-locking device of any magnetically controlled circuit breaker described in any one of the preceding claims, wherein the electromagnetic mechanism of the self-locking device further includes a drive rod, wherein an end of the limit rod of the electromagnetic mechanism proximate to the moving iron core is fixedly connected to the drive rod, and the drive rod is used to drive the moving contact of the rotating shaft system to contact or separate with the corresponding static contact to conduct and disconnect the main circuit of the circuit breaker; the protective mechanism is used to drive the self-locking device to release, so that the drive rod of the electromagnetic mechanism drives the moving contact to disconnect the main circuit.

[0023] The self-locking device of the magnetically controlled circuit breaker and the magnetically controlled circuit breaker of the present invention drive the push rod to push the roller and the limit rod to achieve the closing lock by the push rod spring, and release the lock of the roller by the push rod to release the buckle of the roller and the limit rod to achieve the release and opening of the circuit breaker, thereby ensuring that the circuit breaker can be closed quickly and reliably, and can be opened quickly and reliably with a small tripping force.

[0024] In addition, when closing the circuit breaker, the push rod can rotate under the joint drive of the push rod spring and the striking rod, avoiding the problem of the push rod being unable to rotate or rotating incompletely due to deformation and failure of the push rod spring or insufficient elastic force, thereby improving the reliability of the closing lock.

[0025] In addition, the roller cooperates with the buckle surface to achieve a stable locking state, preventing the buckle from slipping. Moreover, during the unfastening process of the self-locking device, the roller rolls and makes circular motion on the buckle surface to gradually separate from the buckle surface until the roller automatically switches to rolling on the limit surface. The movement is smooth and continuous, preventing the device from getting stuck.

[0026] In addition, the compact structure shortens the roller's movement path, allowing for quick closing and unlocking, further increasing the closing and opening speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the self-locking device and the rotating shaft system of the utility model;

[0028] Figure 2 This is a structural diagram of the self-locking device and the rotating shaft system when the utility model is closed;

[0029] Figure 3 This is a structural diagram of the self-locking device and the rotating shaft system when the utility model is opened;

[0030] Figure 4 This is a structural diagram of the self-locking device and the rotating shaft system during the closing process of the utility model;

[0031] Figure 5 It is a structural diagram of the self-locking device of the utility model;

[0032] Figure 6 It is a structural diagram of the limit rod of the utility model;

[0033] Figure 7 It is a structural diagram of the mounting plate of the utility model;

[0034] Figure 8 It is a cross-sectional view of the electromagnetic mechanism of the utility model;

[0035] Figure 9 It is a structural schematic diagram of the unbuttoning component of the utility model.

[0036] First rotation center a; Second rotation center b; Fixed frame 100; Mounting plate 110; Movable hole 111; Stop side wall 112; Hinge shaft hole 113; Stop arm 114; Electromagnetic mechanism 200; Limit rod 210; Hook surface 211; Limit surface 212; Through hole 213; Moving iron core 220; Moving iron core spring 221; Sliding hole 222; Driving rod 230; Striking rod 240; Striking elbow 241; Connecting portion 242; Fixed portion 243; Housing 250; Stationary iron core 260; Sliding shaft 261; Guide tube 270; Frame 280; coil 290; locking assembly 300; roller 310; linkage shaft 320; connecting rod 330; hinge shaft 340; trip assembly 400; push rod 410; push rod rotating part 411; trigger arm 412; trip arm 413; first abutment surface 4131; second abutment surface 4132; impact surface 4133; push rod spring 420; push rod rotating shaft 430; limiting boss 431; bushing 440; rotating shaft system 500; moving contact 510; support member 520; transmission arm 521; transmission connecting rod 530; static contact 600. DETAILED DESCRIPTION

[0037] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the self-locking device of the magnetically controlled circuit breaker and the magnetically controlled circuit breaker of the present invention. The self-locking device of the magnetically controlled circuit breaker and the magnetically controlled circuit breaker of the present invention are not limited to the description of the following embodiments.

[0038] like Figure 1 As shown, the magnetically controlled circuit breaker of this embodiment includes a shaft system 500, a protection mechanism (not shown), and a self-locking device for the magnetically controlled circuit breaker. The shaft system 500 is provided with at least one movable contact 510. The self-locking device of the magnetically controlled circuit breaker includes a fixing frame 100, an electromagnetic mechanism 200, a locking assembly 300, and a trip assembly 400. The electromagnetic mechanism 200 of the self-locking device is used to drive the movable contact 510 of the shaft system 500 to contact or separate with the corresponding static contact 600 to connect and disconnect the main circuit of the circuit breaker, thereby closing and opening the circuit breaker. The protection mechanism is used to drive the self-locking device to trip when a fault occurs in the main circuit (such as overcurrent, overload, overvoltage, undervoltage, leakage, short circuit, etc.), causing the electromagnetic mechanism 200 to drive the movable contact to disconnect the main circuit to achieve the protection function. It should be noted that the protection mechanism is an existing technology and can be one or more of a trip button for manual tripping, a flux release for magnetic flux tripping, and a backup release for backup electromagnet tripping.

[0039] like Figure 2-Figure 4 As shown, the electromagnetic mechanism 200 includes a limit rod 210 and a moving iron core 220, and the limit rod 210 is fixedly connected to the moving iron core 220; the locking assembly 300 includes a roller 310 arranged on the fixed frame 100, and the roller 310 can make a circular motion around the first rotation center a to switch between the closed position and the open position; the tripping assembly 400 includes a push rod 410 and a push rod spring 420, and the push rod 410 is rotatably arranged on the fixed frame 100 around the second rotation center b.

[0040] The push rod spring 420 is used to drive the push rod 410 to push the roller 310 to the closed position, so that the roller 310 and the limit rod 210 are locked together to prevent the moving iron core 220 from moving in the opening direction; the push rod 410 is used to rotate under external force to release the lock on the roller 310, so that the roller 310 and the limit rod 210 are released, so that the moving iron core 220 can move in the opening direction. The self-locking device of the magnetically controlled circuit breaker and the magnetically controlled circuit breaker of this embodiment realize the closing lock by driving the push rod spring 420 to push the push rod 410 to lock with the roller 310 and the limit rod 210, and realize the release and opening of the circuit breaker by releasing the lock on the roller 310 and releasing the lock on the roller 310 and the limit rod 210, thereby ensuring that the circuit breaker can be closed quickly and reliably, and opened quickly and reliably with a small tripping force.

[0041] like Figure 1 and Figure 5As shown, the driving structure between the electromagnetic mechanism 200 and the rotating shaft system 500 of this embodiment has multiple implementation methods. One optional method is that the electromagnetic mechanism 200 also includes a driving rod 230, and the end of the limiting rod 210 close to the moving iron core 220 is fixedly connected to the driving rod 230, and the driving rod 230 passes through the through hole 213 of the limiting rod 210 and is arranged perpendicular to the limiting rod 210; the rotating shaft system 500 also includes a support member 520 and a transmission connecting rod 530, the moving contact 510 is arranged on the support member 520, the support member 520 is rotatably arranged, and the support member 520 is extended with a transmission arm 521 for being hinged to one end of the transmission connecting rod 530, and the other end of the transmission connecting rod 530 is hinged to the driving rod 230. The drive rod 230 drives the transmission connecting rod 530 of the rotating shaft system 500, which in turn drives the support member 520 to rotate. As a result, the movable contact 510 rotates with the support member 520 to contact or separate from the corresponding static contact 600, thereby closing and opening the circuit breaker. Of course, other transmission structures can also be provided to drive the support member 520 to rotate.

[0042] like Figure 4 As shown, the electromagnetic mechanism 200 of this embodiment further includes a striking rod 240. The end of the limiting rod 210 away from the movable iron core 220 is fixedly connected to the striking rod 240. The striking rod 240 is used to drive the push rod 410 to push the roller 310 toward the closed position when the limiting rod 210 moves in the closing direction with the movable iron core 220. When the switch is closed, the push rod 410 can rotate under the joint drive of the push rod spring 420 and the striking rod 240. This avoids the problem of the push rod 410 being unable to rotate or rotating incompletely due to deformation and failure of the push rod spring 420 or insufficient elasticity, thereby improving the reliability of the closing lock.

[0043] For example, Figure 3 and Figure 4 As shown, the striking rod 240 of this embodiment is an integrally formed structure, including an L-shaped connecting portion 242 and a U-shaped fixing portion 243. The two sides of the fixing portion 243 clamp the end of the limiting rod 210 away from the movable iron core 220 and are fixed together by rivets. The opening of the connecting portion 242 is arranged facing the limiting rod 210. One end of the connecting portion 242 is connected to the bottom edge of the fixing portion 243, and the other end is bent toward the limiting rod 210 to form a striking elbow 241 for pushing against the ejector rod 410. The overall structure is simple and easy to connect. The L-shaped connecting portion 242 avoids interference with other parts during movement, mainly used to avoid the movement trajectory of the roller 310, and also gives the striking elbow 241 a certain degree of elasticity, which plays a protective role. Of course, the striking rod 240 can also adopt other structures. For example, the fixing portion 243 can be non-U-shaped.

[0044] like Figure 5 and Figure 6As shown, the cooperation structure between the limit rod 210 and the roller 310 of this embodiment, the limit rod 210 is provided with a buckle surface 211 and a limit surface 212, the buckle surface 211 is used to buckle with the roller 310 located in the closing position, and is used to push the roller 310 to move to the opening position when the limit rod 210 moves in the opening direction with the moving iron core 220, so that the limit surface 212 can lock the roller 310 in the opening position, so that the roller 310 keeps the top rod spring 420 in the energy storage state through the top rod 410.

[0045] Preferably, the buckle surface 211 is perpendicular to the direction of movement of the limiting rod 210, and the buckle surface 211 is perpendicularly connected to the limiting surface 212. The roller 310 in the closing position blocks the path of the buckle surface 211 moving in the opening direction. When the limiting rod 210 moves in the opening direction with the moving iron core 220, the buckle surface 211 of the limiting rod 210 pushes the roller 310 to roll onto the limiting surface 212. The roller 310 and the buckle surface 211 are buckled together to achieve a stable locking state, preventing the buckle from slipping. Moreover, when the self-locking device is released, the roller 310 rolls and makes a circular motion on the buckle surface 211 to gradually separate from the buckle surface 211 until the roller 310 automatically switches to rolling on the limiting surface 212. The movement is smooth and continuous, preventing the device from being stuck.

[0046] like Figure 1 and Figure 5 As shown, the first rotation center a and the second rotation center b are parallel and perpendicular to the movement direction of the limiting rod 210. The fixing frame 100 includes two mounting plates 110 spaced apart along the first rotation center a and two side plates (not shown) perpendicularly disposed on either side of the two mounting plates 110. The mounting plates 110 are riveted to the side plates, and an installation space is defined between the two mounting plates 110. The end of the limiting rod 210 away from the movable iron core 220 extends into the installation space. The roller 310 and the push rod 410 are respectively installed in the installation space. The first rotation center a of the roller 310 is located on the path of the limiting rod 210 moving in the opening direction, and the second rotation center b of the push rod 410 is located to one side of the limiting rod 210. The compact structure shortens the movement path of the roller 310, enabling rapid closing and unlocking of the switch, further improving the closing and opening speed.

[0047] like Figure 5 and Figure 7As shown, the locking assembly 300 of this embodiment also includes a linkage shaft 320, two connecting rods 330 and two hinge shafts 340. The mounting plate 110 is provided with a movable hole 111 corresponding to the linkage shaft 320 and a hinge shaft hole 113 corresponding to the hinge shaft 340. The roller 310 is sleeved on the middle part of the linkage shaft 320. The two ends of the linkage shaft 320 respectively pass through the movable holes 111 of the two mounting plates 110 and are hinged to one end of the two connecting rods 330. The other ends of the two connecting rods 330 are respectively hinged to the outer sides of the two mounting plates 110 through two hinge shafts 340. The two hinge shafts 340 are coaxially arranged, and the first rotation center a is the axis center of the hinge shaft 340.

[0048] Preferably, the movable hole 111 has a stop side wall 112, which abuts the linkage shaft 320 when the roller 310 is in the closing position. The linkage shaft 320 cooperates with the stop side wall 112 to keep the roller 310 stably in the closing position, thereby improving the stability and reliability of the closing lock of the device.

[0049] like Figure 5 and Figure 7 As shown, the push rod 410 of this embodiment is an integrally formed structure, including a push rod rotating part 411, the push rod rotating part 411 is rotatably arranged on the fixed frame 100 through the push rod rotating shaft 430, the push rod rotating shaft 430 is installed on the fixed frame 100, the push rod rotating part 411 is provided with a first shaft hole that is rotatably matched with the push rod rotating shaft 430, the push rod rotating part 411 is sleeved on the push rod rotating shaft 430 through the first shaft hole, the second rotation center b is the axis of the push rod rotating shaft 430, the push rod rotating part 411 is radially extended with a trigger arm 412 for receiving external force and a trip arm 413 that cooperates with the roller 310, the trigger arm 412 extends out of the installation space through the through hole on the side panel when the roller 310 is in the closed position, and is arranged corresponding to the protection mechanism. Figure 2-Figure 4 As shown, the tripping arm 413 has a first abutting surface 4131, a second abutting surface 4132 and a striking surface 4133 which are connected in sequence. The first abutting surface 4131 is used to abut against the roller 310 located in the open position, the second abutting surface 4132 is used to abut against the roller 310 located in the closed position, and the striking surface 4133 is used to cooperate with the striking elbow 241 of the striking rod 240.

[0050] For example, Figure 5 and Figure 9As shown, the unfastening assembly 400 of this embodiment also includes a sleeve 440, which is provided with a second shaft hole that cooperates with the push rod shaft 430. The sleeve 440 is sleeved on the push rod shaft 430 through the second shaft hole. The radial protrusion of the push rod shaft 430 forms a limiting boss 431, and the push rod rotating part 411 is located between the limiting boss 431 and the sleeve 440 at the upper limit in the direction of the second rotation center b.

[0051] The lift rod spring 420 of this embodiment is used to drive the lift rod 410 to reset, thereby driving the lift rod 410 to push the roller 310 to the closed position. The structure and installation position of the lift rod spring 420 are not limited. For example, the lift rod spring 420 is a torsion spring, which is sleeved on the shaft sleeve 440. One end of the lift rod spring 420 abuts against the lift rod rotating portion 411, and the other end abuts against the side plate.

[0052] Preferably, a stop arm 114 is provided on the fixing frame 100. When the roller 310 is in the closed position, the stop arm 114 abuts against the first abutment surface 4131 of the trip arm 413. The trip arm 413 of the push rod 410 cooperates with the stop arm 114 to limit the rotational travel of the push rod 410, thereby stably maintaining the roller 310 in the closed position and improving the stability and reliability of the device's closing lock.

[0053] like Figure 8 As shown, the electromagnetic mechanism 200 of this embodiment further includes a moving iron core spring 221 . When the roller 310 and the limiting rod 210 are released from the buckle, the moving iron core 220 can move in the opening direction driven by the moving iron core spring 221 .

[0054] like Figure 8As shown, the electromagnetic mechanism 200 of this embodiment has multiple implementation methods. One optional implementation method is that the electromagnetic mechanism 200 also includes a static iron core 260, a sliding shaft 261, a guide tube 270, a skeleton 280 and a coil 290 installed in the shell 250. The electromagnetic mechanism 200 and the fixing frame 100 are arranged between the two side plates along the opening direction, and the shell 250 of the electromagnetic mechanism 200 is riveted between the two side plates. The coil 290 is sleeved on the skeleton 280, the guide tube 270 is arranged in the axial hole of the skeleton 280, the static iron core 260 is fixed in one end of the guide tube 270, the moving iron core 220 is slidably arranged in the other end of the guide tube 270 and is arranged opposite to the static iron core 260, and the axial direction of the moving iron core 220 is provided with a sliding hole 222 that slides with the sliding shaft 261, one end of the sliding shaft 261 is fixedly connected to the static iron core 260, and the other end is inserted into the sliding hole 222 of the moving iron core 220, the end of the moving iron core 220 away from the static iron core 260 is fixedly connected to one end of the limiting rod 210, the other end of the limiting rod 210 passes through the shell 250 and is arranged corresponding to the roller 310, the moving iron core spring 221 is sleeved on the sliding shaft 261 and connected between the moving iron core 220 and the static iron core 260. When the coil 290 is energized, the moving iron core 220 is attracted to the static iron core 260 by the electromagnetic force, and the limiting rod 210 and the driving rod 230 move along with the moving iron core 220. Of course, the electromagnetic mechanism 200 can also adopt other existing structures.

[0055] The specific action process of the self-locking device of this embodiment is as follows: Figure 3 As shown, when the roller 310 is in the opening position, the push rod 410 is subjected to the counterclockwise torque of the push rod spring 420 (that is, the push rod spring 420 is in the energy storage state), the first abutment surface 4131 of the push rod 410 contacts the roller 310, and the roller 310 contacts the limiting surface 212 of the limiting rod 210.

[0056] When closing the circuit breaker, Figure 4 As shown, when the movable iron core 220 moves upward (in the closing direction) under the action of the electromagnetic force, the roller 310 passes over the limit surface 212. At this time, the push rod spring 420 releases energy to drive the push rod 410 to rotate clockwise until the first abutment surface 4131 and the stop arm 114 are limited. At the same time, the push rod 410 pushes the roller 310 to perform a clockwise circular motion through the second abutment surface 4132 until the linkage shaft 320 and the stop side wall 112 of the fixing frame 100 are limited (that is, the roller 310 is in the closing position); Figure 2 As shown, at this time, the electromagnetic force on the moving iron core 220 disappears, and the moving iron core spring 221 exerts a downward reaction force, causing the buckle surface 211 of the limit rod 210 to contact the roller 310. The buckle surface 211 forms a counterclockwise torque on the roller 310, and at the same time, the roller 310 is supported by the push rod 410, forming a locked stable state.

[0057] When opening the gate, the top rod 410 moves clockwise under the impact of the protection mechanism, and the self-locking device is released when the second abutting surface 4132 of the top rod 410 is separated from the roller 310. The moving iron core 220 moves downward (in the opening direction) driven by the moving iron core spring 221, so that the limiting rod 210 pushes the roller 310 to move counterclockwise quickly through the buckle surface 211 until the roller 310 contacts the first abutting surface 4131 of the top rod 410 and the limiting surface 212 of the limiting rod 210 (that is, the roller 310 is in the opening position).

[0058] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0059] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. The self-locking device of the magnetically controlled circuit breaker is characterized by: include Fixed frame (100); The electromagnetic mechanism (200) comprises a limiting rod (210) and a moving iron core (220), wherein the limiting rod (210) is fixedly connected to the moving iron core (220); A locking assembly (300) comprises a roller (310) arranged on a fixing frame (100), wherein the roller (310) can perform circular motion around a first rotation center a to switch between a closing position and an opening position; A release assembly (400) includes a push rod (410) and a push rod spring (420), wherein the push rod (410) is rotatably arranged on a fixed frame (100) around a second rotation center b; The push rod spring (420) is used to drive the push rod (410) to push the roller (310) to move to the closing position, so that the roller (310) and the limit rod (210) are locked together to prevent the moving iron core (220) from moving in the opening direction; the push rod (410) is used to rotate under external force to release the locking of the roller (310), so that the roller (310) and the limit rod (210) are unlocked, so that the moving iron core (220) can move in the opening direction.

2. The self-locking device of the magnetically controlled circuit breaker according to claim 1, characterized in that: The electromagnetic mechanism (200) further comprises a striking rod (240), wherein one end of the limiting rod (210) away from the movable iron core (220) is fixedly connected to the striking rod (240), and the striking rod (240) is used for driving the push rod (410) to push the roller (310) toward the closing position when the limiting rod (210) moves in the closing direction along with the movable iron core (220).

3. The self-locking device of the magnetically controlled circuit breaker according to claim 1, characterized in that: The limiting rod (210) is provided with a buckle surface (211) and a limiting surface (212); the buckle surface (211) is used for buckling with the roller (310) located at the closing position, and is used for pushing the roller (310) to move to the opening position when the limiting rod (210) moves with the moving iron core (220) in the opening direction, so that the limiting surface (212) can lock the roller (310) in the opening position, thereby the roller (310) keeps the push rod spring (420) in an energy storage state through the push rod (410).

4. The self-locking device of the magnetically controlled circuit breaker according to claim 3, characterized in that: The buckle surface (211) is perpendicular to the movement direction of the limiting rod (210), and the buckle surface (211) is vertically connected to the limiting surface (212); the roller (310) located at the closing position is blocked on the path of the buckle surface (211) moving in the opening direction; when the limiting rod (210) moves with the moving iron core (220) in the opening direction, the buckle surface (211) of the limiting rod (210) pushes the roller (310) to roll onto the limiting surface (212).

5. The self-locking device of the magnetically controlled circuit breaker according to claim 1, characterized in that: The first rotation center a and the second rotation center b are parallel and perpendicular to the movement direction of the limit rod (210); the fixing frame (100) comprises two mounting plates (110) spaced apart along the first rotation center a, an installation space is formed between the two mounting plates (110), one end of the limit rod (210) away from the moving iron core (220) extends into the installation space, the roller (310) and the push rod (410) are respectively installed in the installation space, wherein the first rotation center a of the roller (310) is located on the path of the limit rod (210) moving in the opening direction, and the second rotation center b of the push rod (410) is located on one side of the limit rod (210).

6. The self-locking device of the magnetically controlled circuit breaker according to claim 5, characterized in that: The locking assembly (300) further comprises a linkage shaft (320), two connecting rods (330) and two hinge shafts (340); the mounting plate (110) is provided with a movable hole (111) corresponding to the linkage shaft (320) and a hinge shaft hole (113) corresponding to the hinge shaft (340); the roller (310) is sleeved on the middle part of the linkage shaft (320); the two ends of the linkage shaft (320) respectively pass through the movable holes (111) of the two mounting plates (110) and are hinged to one end of the two connecting rods (330); the other ends of the two connecting rods (330) are respectively hinged to the outer sides of the two mounting plates (110) through the two hinge shafts (340); the two hinge shafts (340) are coaxially arranged, and the first rotation center a is the axis center of the hinge shaft (340).

7. The self-locking device of the magnetically controlled circuit breaker according to claim 6, characterized in that: The movable hole (111) has a stop side wall (112), and when the roller (310) is located at the closing position, the stop side wall (112) resists the linkage shaft (320).

8. The self-locking device of the magnetically controlled circuit breaker according to claim 1, characterized in that: The push rod (410) includes a push rod rotating portion (411), and the push rod rotating portion (411) is rotatably arranged on the fixed frame (100) through the push rod rotating shaft (430). The second rotation center b is the axis of the push rod rotating shaft (430). The push rod rotating portion (411) is provided with a trigger arm (412) for receiving external force and a trip arm (413) cooperating with the roller (310) in the radial direction. The trip arm (413) has a first abutting surface (4131) and a second abutting surface (4132) connected to each other. The first abutting surface (4131) is used to abut the roller (310) in the open position, and the second abutting surface (4132) is used to abut the roller (310) in the closed position.

9. The self-locking device of the magnetically controlled circuit breaker according to claim 8, characterized in that: A stop arm (114) is provided on the fixing frame (100), and when the roller (310) is located at the closing position, the stop arm (114) abuts against the first abutting surface (4131) of the tripping arm (413).

10. The self-locking device of the magnetically controlled circuit breaker according to claim 1, characterized in that: The electromagnetic mechanism (200) further comprises a moving iron core spring (221). When the roller (310) and the limiting rod (210) are released from the buckle, the moving iron core (220) can move in the opening direction under the driving of the moving iron core spring (221).

11. The self-locking device of the magnetically controlled circuit breaker according to claim 10, characterized in that: The electromagnetic mechanism (200) further comprises a static iron core (260), a guide tube (270), a skeleton (280) and a coil (290) installed in the housing (250); the coil (290) is sleeved on the skeleton (280); the guide tube (270) is arranged in the axial hole of the skeleton (280); the static iron core (260) is fixed in one end of the guide tube (270); the movable iron core (220) is slidably arranged in the other end of the guide tube (270) and is arranged opposite to the static iron core (260); one end of the movable iron core (220) away from the static iron core (260) is fixedly connected to one end of a limiting rod (210); the other end of the limiting rod (210) passes through the housing (250) and is arranged corresponding to the roller (310); the movable iron core spring (221) is sleeved on the sliding shaft (261) and connected between the movable iron core (220) and the static iron core (260).

12. A magnetically controlled circuit breaker comprising a rotating shaft system (500) and a protection mechanism, wherein the rotating shaft system (500) is provided with at least one moving contact (510), characterized in that: The invention also includes a self-locking device of a magnetically controlled circuit breaker according to any one of claims 1 to 11, wherein the electromagnetic mechanism (200) of the self-locking device further includes a driving rod (230), and one end of the limiting rod (210) of the electromagnetic mechanism (200) close to the moving iron core (220) is fixedly connected to the driving rod (230), and the driving rod (230) is used to drive the moving contact (510) of the rotating shaft system (500) to contact or separate with the corresponding static contact (600) to conduct and disconnect the main circuit of the circuit breaker; and the protection mechanism is used to drive the self-locking device to release, so that the driving rod (230) of the electromagnetic mechanism (200) drives the moving contact (510) to disconnect the main circuit.

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