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 invention 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. An ejector rod spring drives an ejector rod to abut against a rolling shaft and a limiting rod hasp to achieve closing and locking, and the ejector rod relieves locking of the rolling shaft so that the rolling shaft and the limiting rod can release the hasp to achieve 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] This invention relates to the field of low-voltage electrical appliances, specifically to a self-locking device for a magnetically controlled circuit breaker and the magnetically controlled circuit breaker itself. Background Technology

[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 forces, resulting in poor reliability and short lifespan. At the same time, the closing speed is slow, which cannot meet the fast closing requirements of new energy application scenarios.

[0003] Existing circuit breakers also use magnetic control mechanisms for opening and closing operations. Magnetic control mechanisms have the advantages of simple structure and reliable operation. The self-locking structure of the magnetic control mechanism is crucial, as it determines whether the mechanism can close quickly and reliably, and whether it can quickly trip in the event of a fault. At the same time, it requires a small tripping force to avoid burdening the trip actuator and causing an increase in the size and power of the trip actuator. 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 self-locking device for a magnetically controlled circuit breaker and a magnetically controlled circuit breaker.

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

[0006] The self-locking device of a magnetically controlled circuit breaker includes...

[0007] Fixture;

[0008] The electromagnetic mechanism includes a limiting rod and a moving iron core, wherein the limiting rod is fixedly connected to the moving iron core;

[0009] The locking assembly includes a roller mounted on a fixed frame, the roller being able to rotate around a first rotation center a to switch between a closed position and a closed position;

[0010] The unfastening assembly includes a push rod and a push rod spring, wherein the push rod is rotatably mounted on a fixed frame about a second rotation center b;

[0011] The push rod spring is used to drive the push rod to push the roller to the closed position, so that the roller and the limit rod are engaged to prevent the moving iron core from moving in the opening direction; the push rod is used to rotate under external force to release the lock on the roller, so that the roller and the limit rod are released from the engagement, so that the moving iron core can move in the opening direction.

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

[0013] Optionally, the limiting rod is provided with a latching surface and a limiting surface. The latching surface is used to engage with the roller in the closed position and to push the roller to the open position when the limiting rod moves with the moving iron core in the opening direction, so that the limiting surface can lock the roller in the open position, thereby keeping the roller in the energy storage state through the push rod.

[0014] Optionally, the latching surface is perpendicular to the movement direction of the limiting rod, and the latching surface is perpendicularly connected to the limiting surface. The roller located in the closed position abuts against the path of the latching surface moving in the opening direction. During the process of the limiting rod moving in the opening direction with the moving iron core, the latching surface of the limiting rod pushes the roller to roll onto the limiting 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 fixing frame includes two mounting plates spaced apart along the first rotation center a, forming an installation space between the two mounting plates, the end of the limit rod away from the moving iron core extending into the installation space, the roller and the push rod 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 opening direction, and the second rotation center b of the push rod is located on one side of the limit rod.

[0016] Optionally, the locking assembly further includes a linkage shaft, two connecting rods, and two hinge shafts. The mounting plate is provided with movable holes corresponding to the linkage shaft and hinge shaft holes corresponding to the hinge shafts. The roller is sleeved on the middle part of the linkage shaft. The two ends of the linkage shaft 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 side of the two mounting plates through the two hinge shafts. The two hinge shafts are coaxially arranged, and the first rotation center a is the axis of the hinge shaft.

[0017] Optionally, the movable hole has a stop sidewall that abuts against the linkage shaft when the roller is in the closed position.

[0018] Optionally, the push rod includes a push rod rotating part, which is rotatably mounted on a fixed frame via a push rod pivot. The second rotation center b is the axis of the push rod pivot. The push rod rotating part extends radially to provide a trigger arm for receiving external force and an unlocking arm that cooperates with a roller. The unlocking arm has a first abutting surface and a second abutting surface connected together. The first abutting surface is used to abut against the roller located in the open position, and the second abutting surface is used to abut against the roller located in the closed position.

[0019] Optionally, the fixing frame is provided with a stop arm, which abuts against the first contact surface of the release arm when the roller is in the closed position.

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

[0021] Optionally, the electromagnetic mechanism further includes a stationary iron core, a guide tube, a frame, and a coil installed inside the housing. The coil is sleeved on the frame, the guide tube is disposed in the axial hole of the frame, the stationary iron core is fixed in one end of the guide tube, the moving iron core is slidably disposed in the other end of the guide tube and is disposed opposite to the stationary iron core, the end of the moving iron core away from the stationary iron core is fixedly connected to one end of a limiting rod, the other end of the limiting rod passes through the housing and is disposed corresponding to the roller, and the moving iron core is spring-sleeved on the sliding shaft and connected between the moving iron core and the stationary iron core.

[0022] A magnetically controlled circuit breaker includes a rotating shaft system and a protection mechanism. The rotating shaft system is provided with at least one moving contact. It also includes a self-locking device as described in any one of the magnetically controlled circuit breakers. The electromagnetic mechanism of the self-locking device further includes a drive rod. The end of the limiting rod of the electromagnetic mechanism near the moving iron core is fixedly connected to the drive rod. The drive rod is used to drive the moving contact of the rotating shaft system to contact or separate from the corresponding stationary contact, so as to conduct and disconnect the main circuit of the circuit breaker. The protection mechanism is used to drive the self-locking device to unlock, so that the drive rod of the electromagnetic mechanism drives the moving contact to disconnect the main circuit.

[0023] The self-locking device and magnetically controlled circuit breaker of the present invention achieve closing locking by driving the top rod spring to push the roller and the limit rod to latch together. The top rod releases the locking of the roller so that the roller and the limit rod are released to achieve unlocking and opening, ensuring that the circuit breaker can close quickly and reliably, and open quickly and reliably with a small tripping force.

[0024] In addition, when closing the circuit, 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 failing due to deformation or insufficient elasticity, which would cause the push rod to be unable to rotate or not rotate in place, thus improving the reliability of the closing latch.

[0025] In addition, the rollers and the latching surface work together to achieve a stable locking state, preventing slippage. During the unlocking process of the self-locking device, the rollers roll and make circular motions on the latching surface to gradually separate from the latching surface until the rollers automatically switch to rolling on the limiting surface. The action is smooth and continuous, preventing the device from getting stuck.

[0026] In addition, the compact structure results in a short roller movement path, enabling rapid closing and unlocking of the circuit breaker, further improving the closing and opening speed. Attached Figure Description

[0027] Figure 1 This is a perspective view of the self-locking device and rotating shaft system of the present invention;

[0028] Figure 2 This is a schematic diagram of the self-locking device and rotating shaft system during closing of the present invention;

[0029] Figure 3 This is a schematic diagram of the self-locking device and rotating shaft system during circuit breaker opening of the present invention;

[0030] Figure 4 This is a schematic diagram of the self-locking device and the rotating shaft system during the closing process of this invention;

[0031] Figure 5 This is a schematic diagram of the self-locking device of the present invention;

[0032] Figure 6 This is a schematic diagram of the limiting rod of the present invention;

[0033] Figure 7 This is a schematic diagram of the mounting plate of the present invention;

[0034] Figure 8 This is a cross-sectional view of the electromagnetic mechanism of the present invention;

[0035] Figure 9 This is a schematic diagram of the structure of the unfastening component of the present invention.

[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; Limiting rod 210; Fastening surface 211; Limiting surface 212; Through hole 213; Moving iron core 220; Moving iron core spring 221; Sliding hole 222; Drive rod 230; Strike rod 240; Strike elbow 241; Connecting part 242; Fixed part 243; Outer shell 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; Unlocking assembly 400; Push rod 410; Push rod rotating part 411; Trigger arm 412; Unlocking 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 520; Transmission arm 521; Transmission connecting rod 530; Stationary contact 600. Detailed Implementation

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

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

[0039] like Figures 2-4 As shown, the electromagnetic mechanism 200 includes a limiting rod 210 and a moving iron core 220, with the limiting rod 210 and the moving iron core 220 fixedly connected; the locking assembly 300 includes a roller 310 mounted on the fixed frame 100, which can rotate around a first rotation center a to switch between the closed and open positions; the unlocking assembly 400 includes a push rod 410 and a push rod spring 420, with the push rod 410 rotatably mounted on the fixed frame 100 around a second rotation center b.

[0040] The push rod spring 420 drives the push rod 410 to push the roller 310 to the closed position, causing the roller 310 to engage with the limit rod 210 to prevent the moving iron core 220 from moving in the opening direction. The push rod 410 is rotated by external force to release the lock on the roller 310, causing the roller 310 to disengage from the limit rod 210, allowing the moving iron core 220 to move in the opening direction. In this embodiment, the self-locking device and the magnetically controlled circuit breaker achieve closing locking by driving the push rod 410 to push the roller 310 to engage with the limit rod 210 through the push rod spring 420. Releasing the lock on the roller 310 by the push rod 410 allows the roller 310 to disengage from the limit rod 210, achieving release and opening. This ensures that the circuit breaker can close quickly and reliably, and open 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 in this embodiment has multiple implementations. One optional implementation is that the electromagnetic mechanism 200 further includes a driving rod 230, and one end of the limiting rod 210 near the moving iron core 220 is fixedly connected to the driving rod 230. The driving rod 230 passes through the through hole 213 of the limiting rod 210 and is arranged perpendicularly to the limiting rod 210. The rotating shaft system 500 further includes a support member 520 and a transmission connecting rod 530. The moving contact 510 is disposed on the support member 520. The support member 520 is rotatably disposed. The support member 520 extends to provide a transmission arm 521 for hinged to one end of the transmission connecting rod 530. The other end of the transmission connecting rod 530 is hinged to the driving rod 230. The drive rod 230 drives the transmission link 530 of the rotating shaft system 500, which in turn drives the support member 520 to rotate. This causes the moving contact 510 to rotate with the support member 520, allowing it to contact or separate from the corresponding stationary contact 600, thus achieving the closing and opening of the circuit breaker. Alternatively, other transmission structures can be used to drive the support member 520 to rotate.

[0042] like Figure 4 As shown, the electromagnetic mechanism 200 in this embodiment also includes a striking rod 240. The end of the limiting rod 210 away from the moving 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 to the closing position when the limiting rod 210 moves with the moving iron core 220 in the closing direction. When closing, the push rod 410 can rotate under the joint drive of the push rod spring 420 and the striking rod 240, avoiding the problem that the push rod 410 cannot rotate or cannot rotate to the correct position due to deformation failure or insufficient elasticity of the push rod spring 420, thus improving the reliability of the closing latch.

[0043] For example, such as Figure 3 and Figure 4 As shown, the striking rod 240 in this embodiment is a one-piece molded structure, including an L-shaped connecting part 242 and a U-shaped fixing part 243. The two sides of the fixing part 243 clamp the end of the limiting rod 210 away from the moving iron core 220 and are fixed together by rivets. The opening of the connecting part 242 faces the limiting rod 210. One end of the connecting part 242 is connected to the bottom edge of the fixing part 243, and the other end is bent toward the limiting rod 210 to form a striking bend 241 for pushing against the top rod 410. The overall structure is simple and easy to connect. The L-shaped connecting part 242 avoids interference with other parts during movement and is mainly used to avoid the movement trajectory of the roller 310. It also gives the striking bend 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 part 243 does not have to be U-shaped.

[0044] like Figure 5 and Figure 6As shown, the cooperation structure between the limiting rod 210 and the roller 310 in this embodiment is such that the limiting rod 210 is provided with a latching surface 211 and a limiting surface 212. The latching surface 211 is used to latch and cooperate with the roller 310 when it is in the closed position, and is used to push the roller 310 to the open 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 open position, thereby the roller 310 keeps the push rod spring 420 in the energy storage state through the push rod 410.

[0045] Preferably, the latching surface 211 is perpendicular to the movement direction of the limiting rod 210, and the latching surface 211 is perpendicularly connected to the limiting surface 212. The roller 310, located in the closed position, abuts against the path of the latching surface 211 moving towards the open direction. During the movement of the limiting rod 210 with the moving iron core 220 towards the open direction, the latching surface 211 of the limiting rod 210 pushes the roller 310 to roll onto the limiting surface 212. The roller 310 and the latching surface 211 latch together to achieve a stable locking state, preventing slippage. Moreover, during the unlocking process of the self-locking device, the roller 310 rolls and makes circular motion on the latching surface 211 to gradually separate from the latching surface 211 until the roller 310 automatically switches to rolling on the limiting surface 212. The action is smooth and continuous, preventing the device from getting 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 limit 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 in the figure) perpendicularly arranged on both sides of the two mounting plates 110. The mounting plates 110 are riveted to the side plates, and the two mounting plates 110 form an installation space. The end of the limit rod 210 away from the moving iron core 220 extends into the installation space. The roller 310 and the top 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 limit rod 210 moving in the opening direction, and the second rotation center b of the top rod 410 is located on one side of the limit rod 210. The structure is compact, making the movement path of the roller 310 short, so as to quickly realize the closing lock and unlocking opening, further improving the opening and closing 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 pass through the movable holes 111 of the two mounting plates 110 respectively 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 side 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 of the hinge shaft 340.

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

[0049] like Figure 5 and Figure 7 As shown, the push rod 410 in this embodiment is an integrally formed structure, including a push rod rotating part 411. The push rod rotating part 411 is rotatably mounted on the fixed frame 100 via a push rod rotating shaft 430. The push rod rotating shaft 430 is mounted on the fixed frame 100. The push rod rotating part 411 has a first shaft hole that rotatably engages 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 radial extensions of the push rod rotating part 411 are respectively provided with a trigger arm 412 for receiving external force and an unlocking arm 413 that engages with the roller 310. When the roller 310 is in the closed position, the trigger arm 412 extends out of the installation space through a through hole on the side plate, corresponding to the protection mechanism. Figures 2-4 As shown, the release arm 413 has a first abutting surface 4131, a second abutting surface 4132 and a striking surface 4133 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 bend 241 of the striking rod 240.

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

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

[0052] Preferably, the fixing frame 100 is provided with a stop arm 114, which abuts against the first contact surface 4131 of the release arm 413 when the roller 310 is in the closed position. The release arm 413 of the push rod 410 cooperates with the stop arm 114 to limit the rotation stroke of the push rod 410, thereby making the roller 310 stably stay in the closed position and improving the stability and reliability of the device's closing latch.

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

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

[0055] The specific operation process of the self-locking device in this embodiment is as follows: Figure 3 As shown, when the roller 310 is in the open position, the push rod 410 is subjected to a counterclockwise torque from the push rod spring 420 (that is, the push rod spring 420 is in an energy storage state), the first contact 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, if Figure 4 As shown, when the moving iron core 220 moves upward (in the closing direction) under the action of electromagnetic force, the roller 310 passes the limiting surface 212. At this time, the push rod spring 420 releases energy, causing the push rod 410 to rotate clockwise until it is limited by the first contact surface 4131 and the stop arm 114. At the same time, the push rod 410 pushes the roller 310 through the second contact surface 4132 to make clockwise circular motion until the linkage shaft 320 is limited by the stop side wall 112 of the fixed frame 100 (i.e., 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 it is subjected to the downward reaction force of the moving iron core spring 221, which causes the latching surface 211 of the limiting rod 210 to contact the roller 310. The latching surface 211 forms a counterclockwise torque on the roller 310, and at the same time the roller 310 is held in place by the push rod 410, forming a locked and stable state.

[0057] When the circuit breaker is opened, the push rod 410 moves clockwise under the impact of the protection mechanism. When the second contact surface 4132 of the push rod 410 separates from the roller 310, the self-locking device is released. The moving iron core 220 moves downward (in the opening direction) under the drive of the moving iron core spring 221, so that the limit rod 210 pushes the roller 310 to move counterclockwise quickly through the latching surface 211 until the roller 310 contacts the first contact surface 4131 of the push rod 410 and the limit surface 212 of the limit rod 210 (i.e., the roller 310 is in the open position).

[0058] 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.

[0059] 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 self-locking device for a magnetically controlled circuit breaker, characterized in that: include Fixture (100); The electromagnetic mechanism (200) includes a limiting rod (210) and a moving iron core (220), wherein the limiting rod (210) is fixedly connected to the moving iron core (220); The locking assembly (300) includes a roller (310) disposed on a fixed frame (100), the roller (310) being able to rotate around a first rotation center a to switch between the closed position and the open position; The unfastening assembly (400) includes a push rod (410) and a push rod spring (420), wherein the push rod (410) is rotatably mounted on the fixed frame (100) about a second rotation center b; 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 engaged to prevent the moving iron core (220) from moving in the opening direction; the push rod (410) is used to be rotated by external force to release the lock on the roller (310), so that the roller (310) and the limit rod (210) are released from the engagement, 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) also includes a striking rod (240). The end of the limiting rod (210) away from the moving iron core (220) is fixedly connected to the striking rod (240). The striking rod (240) is used to drive the top rod (410) to push the roller (310) to move towards the closing position when the limiting rod (210) moves with the moving iron core (220) in the closing direction.

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 latching surface (211) and a limiting surface (212). The latching surface (211) is used to latch and cooperate with the roller (310) located in the closed position, and is used to push the roller (310) to the open 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 open position, so that the roller (310) keeps the top rod spring (420) in the energy storage state through the top rod (410).

4. The self-locking device of the magnetically controlled circuit breaker according to claim 3, characterized in that: The latching surface (211) is perpendicular to the movement direction of the limiting rod (210), and the latching surface (211) is perpendicularly connected to the limiting surface (212). The roller (310) located in the closed position abuts against the path of the latching surface (211) moving in the opening direction. During the process of the limiting rod (210) moving in the opening direction with the moving iron core (220), the latching 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 fixed frame (100) includes two mounting plates (110) spaced apart along the first rotation center a, and the two mounting plates (110) form an installation space. The end of the limit rod (210) away from the moving iron core (220) extends into the installation space. The roller (310) and the top 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 limit rod (210) moving in the opening direction, and the second rotation center b of the top 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 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) pass through the movable holes (111) of the two mounting plates (110) respectively 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 outside 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 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 sidewall (112), which abuts against the linkage shaft (320) when the roller (310) is in the closed position.

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 part (411), which is rotatably mounted on the fixed frame (100) via a push rod rotating shaft (430). 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 an unlocking arm (413) that cooperates with the roller (310). The unlocking arm (413) has a first abutting surface (4131) and a second abutting surface (4132) connected together. The first abutting surface (4131) is used to abut against the roller (310) located in the open position, and the second abutting surface (4132) is used to abut against the roller (310) located in the closed position.

9. The self-locking device of the magnetically controlled circuit breaker according to claim 8, characterized in that: The fixed frame (100) is provided with a stop arm (114), which abuts the first contact surface (4131) of the release arm (413) when the roller (310) is in the closed position.

10. A magnetically controlled circuit breaker, comprising a shaft system 500 and a protection mechanism, wherein the shaft system (500) is provided with at least one moving contact (510), characterized in that: It also includes a self-locking device for a magnetically controlled circuit breaker as described in any one of claims 1-9, wherein the electromagnetic mechanism (200) of the self-locking device further includes a drive rod (230), and the end of the limiting rod (210) of the electromagnetic mechanism (200) near the moving iron core (220) is fixedly connected to the drive rod (230). The drive rod (230) is used to drive the moving contact (510) of the rotating shaft system (500) to contact or separate from the corresponding stationary contact (600) to conduct and disconnect the main circuit of the circuit breaker; the protection mechanism is used to drive the self-locking device to unlock, so that the drive rod (230) of the electromagnetic mechanism (200) drives the moving contact (510) to disconnect the main circuit.

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