A plug-in circuit breaker

Abstract

The application provides an insertion type circuit breaker, which comprises an outer shell, a PCB circuit board, an MCU single-chip microcomputer, a transmission plate, a reset torsional spring, a static contact, a contact system, a first connecting rod, a micro switch and a solid-state switch; the transmission plate is located in the outer shell and is sleeved outside the shaft rod and can rotate around the shaft rod under the action of external force; the reset torsional spring is sleeved outside the shaft rod; the static contact is arranged in the outer shell and is located at the right side of the sliding groove; the contact system is installed in the outer shell and can make linear motion in the outer shell, so that the contact system is in contact with or separated from the static contact; the two ends of the first connecting rod are rotatably connected to the transmission plate and the contact system respectively; the micro switch is installed on the PCB circuit board and is linked with the contact system; and the solid-state switch is installed in the outer shell. The switching mechanism of the application is different from the mechanism of the traditional switch, does not have the locking buckle and the jump buckle of the traditional switch mechanism, has simple mechanism structure, has little or no wear and tear of the switching mechanism, has better mechanical life of the switch, and has more reliable performance of the whole mechanism.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage electrical appliance technology, and specifically relates to a plug-in circuit breaker. Background Technology

[0002] Traditional plug-in circuit breakers have a complex mechanism involving numerous components, requiring high precision in component dimensions and manufacturing processes, as well as significant internal space. They are also prone to failure and have low reliability. Furthermore, traditional circuit breakers generate a large arc when breaking under high short-circuit current conditions, limiting their application scenarios. Therefore, it is necessary to design a new circuit breaker that uses a solid-state switch to handle the energy generated during connection and disconnection, while the mechanical switch in the circuit breaker body is only used for isolation and does not need to handle the energy generated during connection and disconnection. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a plug-in circuit breaker that is simple in structure, has a longer lifespan, and is more reliable in performance.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A plug-in circuit breaker includes a hollow housing serving as a load-bearing base, a transmission plate, a return torsion spring, a stationary contact, a contact system, and a first connecting rod. The housing contains a horizontally arranged sliding groove and a vertically mounted shaft. The shaft is located to the left of the sliding groove. The transmission plate is located inside the housing and has a first through hole and a second through hole, the second through hole being located to the right of the first through hole. The transmission plate is sleeved around the shaft through the first through hole and can rotate around the shaft under external force. The return torsion spring is sleeved around the shaft and has two rotating arms, the left rotating arm of which is engaged inside the housing. The first connecting rod is mounted on the wall, with its right-side rotating arm secured to the transmission plate. The stationary contact is located inside the housing and on the right side of the slide groove. The contact system is installed in the slide groove and can move linearly along the slide groove, allowing the contact system to contact or separate from the stationary contact. The left end of the first connecting rod is rotatably connected to the second through hole, and the right end is rotatably connected to the contact system. When the contact system contacts the stationary contact, the right rotating arm of the reset torsion spring moves closer to its left rotating arm, and the reset torsion spring stores energy. When the contact system separates from the stationary contact, the reset torsion spring releases energy, and the right rotating arm of the reset torsion spring opens to the right and pushes the transmission plate to rotate clockwise.

[0006] Furthermore, it also includes a PCB circuit board installed inside the housing, an MCU microcontroller installed on the PCB circuit board, a micro switch, and a solid-state switch; the micro switch is installed on the PCB circuit board and located on the right side of the contact system, and the micro switch is linked with the contact system to send the opening and closing signals to the MCU microcontroller; the solid-state switch is installed inside the housing and is used to connect or disconnect under the control of the MCU microcontroller to close or open the plug-in circuit breaker.

[0007] Furthermore, the first through hole (or shaft) is collinear with the slide groove.

[0008] Furthermore, the contact system includes a contact support, a moving contact, a contact spring, and a toggle lever. The contact support is slidably installed in a groove and can move linearly along the groove. The bottom of the contact support is concave to form a horizontally set mounting groove, and a connecting hole is provided on the left side of the contact support. The connecting hole is rotatably connected to the right end of the first connecting rod. The moving contact is slidably installed in the mounting groove and its right end extends out of the mounting groove. The moving contact can move linearly towards or away from the stationary contact under the drive of the contact support, thereby adhering to or disengaging from the stationary contact. The contact spring is installed in the mounting groove and sleeved on the left end of the moving contact. The left end of the contact spring abuts against the contact support, and the right end abuts against the left side of the moving contact. The left end of the toggle lever is fixed to the contact support, while its right end is linked with the micro switch. When the contact support slides along the groove, it drives the toggle lever to slide left and right, causing the toggle lever to touch the micro switch contact. The micro switch sends an opening signal or an closing signal to the MCU microcontroller, which controls the solid-state switch to turn on or off.

[0009] Furthermore, when the first through hole, the second through hole, the first connecting rod, and the moving contact are collinear, the moving contact and the stationary contact are in contact with each other, and the return torsion spring and the contact spring are both in an energy storage state. At this time, if the transmission plate continues to rotate counterclockwise under the action of external force, it will pull the first connecting rod contact support to slide away from the stationary contact, so that the second through hole moves above the first through hole and the slide groove. At this time, the return torsion spring and the contact spring are still in a compressed state, and at the same time, the return torsion spring and the contact spring both apply a thrust to the transmission plate. The torque applied by the contact spring to the transmission plate is opposite in direction to the torque applied by the return torsion spring to the transmission plate, and the torque applied by the contact spring to the transmission plate is greater than the torque applied by the return torsion spring to the transmission plate. When the external force disappears, the transmission plate will continue to rotate counterclockwise under the action of the contact spring, and the moving contact will continue to maintain contact with the stationary contact under the action of the contact spring.

[0010] Furthermore, the housing is provided with a raised rib to lock the transmission plate and prevent it from rotating excessively counterclockwise under the push of the contact spring.

[0011] Furthermore, a limiting groove is provided symmetrically on both the front and rear sides of the mounting groove supporting the contact; a limiting protrusion is provided on the moving contact corresponding to the two limiting grooves, which can slide left and right in the limiting groove.

[0012] Furthermore, to ensure that the MCU can control the circuit breaker to trip under conditions such as overload, short circuit, and over / under voltage, the plug-in circuit breaker also includes a trip unit. The trip unit includes a housing, a moving iron core, a stationary iron core, a coil, a push rod, and a return spring. The housing is installed inside the outer casing, with an opening at the left end facing the transmission plate (lower right end), and is cylindrical. The stationary iron core is a cylinder fixed inside the housing on the left side and communicating with the housing opening. The moving iron core is a cylinder located inside the housing on the right side and can slide inside the housing. The coil is wound around the outside of the housing and can be energized or de-energized under the control of the MCU. The coil is connected to a relay at both ends. The relay is installed inside the housing and switched on and off by the MCU microcontroller to energize or de-energize the coil. The push rod is located inside the housing, with its two ends respectively fitted inside the moving iron core and the stationary iron core, and can move left and right inside the stationary iron core. The right end of the push rod is fixed inside the moving iron core and can move back and forth driven by the moving iron core. The reset spring is fitted outside the push rod and located between the moving iron core and the stationary iron core, and its diameter is larger than the inner diameter of the moving iron core. When the coil is energized, the moving iron core and the stationary iron core generate a magnetic force that attracts each other. The moving iron core will overcome the spring force of the reset spring and move towards the stationary iron core, pushing the push rod to extend out of the housing to the left, thereby pushing the transmission plate to rotate clockwise, causing the plug-in circuit breaker to trip and open. When the coil is de-energized, the moving iron core and the stationary iron core lose their magnetic force. The moving iron core will move away from the stationary iron core under the action of the reset spring and drive the push rod to retract back into the housing.

[0013] Furthermore, the structure for driving the transmission plate to close or open the circuit is as follows: the plug-in circuit breaker also includes a handle and a second connecting rod; the left end of the handle is located outside the housing, while its right end is slidably installed inside the housing and can move linearly inside the housing; the two ends of the second connecting rod are respectively rotatably connected to the lower right part of the handle and the lower left part of the transmission plate.

[0014] Furthermore, to prevent the plug-in circuit breaker from being accidentally closed before being inserted into the cabinet, the plug-in circuit breaker also includes an anti-misclosing mechanism. This mechanism includes a through hole, a pin, a connecting rod, a latch, a first locking hook, a second locking hook, and a locking torsion spring. The through hole is located on the outer casing and above the shaft. The pin is vertically installed inside the outer casing and located to the left of the through hole. The left end of the connecting rod is rotatably mounted outside the pin. The latch is fixed to the right end of the connecting rod and extends out of the outer casing from the through hole. The left side of the latch is inclined and can be pressed into the outer casing under external force, causing the connecting rod to rotate clockwise. The first locking hook is fixed to the left end of the connecting rod with its hook face upwards. The second locking hook is fixed to the transmission plate with its hook face upwards. Facing downwards, the second locking hook is located above the first locking hook and engages with it; the locking torsion spring is sleeved on the pin rod, which also has two rotating arms, the left rotating arm of which is locked onto the outer casing, and the right rotating arm of which is locked onto the buckle; before the plug-in circuit breaker is inserted into the cabinet, the buckle extends out of the through hole, and the connecting rod is pressed against the inner side of the outer casing under the action of the locking torsion spring, the second locking hook and the first locking hook are interlocked, and the transmission plate is difficult to rotate counterclockwise under the action of external force and drive the contact system to move to the right to close the circuit through the first connecting rod; after the plug-in circuit breaker is inserted into the cabinet, the buckle is pressed into the outer casing by the cabinet and drives the connecting rod to rotate clockwise, which drives the first locking hook to rotate clockwise and disengage from the second locking hook, and the transmission plate is in a state where it can rotate freely.

[0015] The advantages of this invention are:

[0016] The switching mechanism of this invention differs from that of traditional switches in that it lacks the locking and tripping mechanisms of traditional switches. The mechanism has a simple structure, minimal or no wear during opening, closing, and tripping, resulting in a longer mechanical lifespan and more reliable overall performance. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the plug-in circuit breaker of the present invention in the open state;

[0019] Figure 2 This is a schematic diagram of the structure of the plug-in circuit breaker of the present invention, showing that the first through hole, the second through hole, and the contact system are collinear.

[0020] Figure 3 This is a schematic diagram of the plug-in circuit breaker of the present invention in the closed state;

[0021] Figure 4 This is a partial structural diagram of the housing of the plug-in circuit breaker described in this invention;

[0022] Figure 5 This is a diagram showing the installation state of the connecting plate in the housing of the plug-in circuit breaker described in this invention;

[0023] Figure 6 This is a schematic diagram of the connecting plate in the plug-in circuit breaker described in this invention;

[0024] Figure 7 This is a schematic diagram of the contact system in the plug-in circuit breaker described in this invention;

[0025] Figure 8 This is a schematic diagram of the trip unit in the plug-in circuit breaker described in this invention;

[0026] Figure 9 for Figure 8 A cross-sectional view along the AA direction;

[0027] Figure 10 This is a schematic diagram showing the installation of the anti-misclosing structure in the plug-in circuit breaker of the present invention within its designated position.

[0028] Figure 11 for Figure 10 A magnified view of a section at point B in the middle;

[0029] The figure shows: 1-outer shell, 2-handle, 3-second link, 4-anti-misoperation closing mechanism, 5-transmission plate, 6-first link, 7-trip device, 8-contact system, 9-stationary contact, 10-micro switch, 11-reset torsion spring. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0031] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Example 1:

[0034] like Figure 1-7 As shown, a plug-in circuit breaker of the present invention includes a housing 1, a PCB circuit board, an MCU microcontroller, a transmission board 5, a reset torsion spring 11, a stationary contact 9, a contact system 8, a first link 6, a micro switch 10, a solid-state switch, a handle 2, and a second link 3.

[0035] like Figure 1-4 As shown, the outer casing 1 serves as the supporting base for the various components inside the circuit breaker. It is hollow inside, and contains a horizontally arranged sliding groove 1a and a vertically installed shaft 5a. The shaft 5a is located to the left of the sliding groove 1a (and is arranged on the same straight line as the sliding groove 1a on the inner wall of the outer casing 1). Figure 5 As shown, a raised rib 1b is provided inside the outer casing 1 to lock the transmission plate 5 and prevent the transmission plate 5 from rotating excessively counterclockwise under the push of the contact spring 8c.

[0036] The PCB circuit board is installed inside the housing 1 and serves as a carrier for various control circuits and electrical components.

[0037] The MCU is mounted on the PCB circuit board and serves as the control core; a conventional MCU is selected.

[0038] like Figure 1-3 and Figure 6 As shown, the transmission plate 5 is located inside the outer casing 1, and the transmission plate 5 is provided with a first through hole 5c, a second through hole 5d, and a third through hole 5e (as shown). Figure 6 As shown), the first through hole 5c is located on the upper left side of the transmission plate 5, the second through hole 5d is located to the right of the first through hole 5c, and the third through hole 5e is located on the lower left side of the transmission plate 5; the transmission plate 5e is sleeved on the shaft 5a through the first through hole 5c and can rotate around the shaft 5a under the action of external force (as shown). Figure 1-3 As shown, when the circuit breaker is closed, the transmission plate 5 rotates counterclockwise; when the circuit breaker is open, the transmission plate 5 rotates clockwise; the first through hole 5c (or shaft 5a) is collinear with the slide groove 1a.

[0039] like Figure 1 and 5As shown, the reset torsion spring 11 is sleeved on the shaft 5a and has two rotating arms. The left rotating arm (near the handle 2) is locked on the inner wall of the housing 1, while the right rotating arm (near the contact system 8) is locked on the transmission plate 5. The torque applied by the reset torsion spring 11 to the transmission plate 5 is always in the direction of circuit breaker opening.

[0040] like Figure 1 and Figure 3 As shown, the stationary contact 9 is disposed inside the housing 1 and located on the right side of the slide groove 1a, and the contact point on its left side wall is collinear with the slide groove 1a.

[0041] like Figure 2 As shown, the contact system 8 is installed in the slide groove 1a and can move linearly along the slide groove 1a, so that the contact system 8 contacts or separates from the stationary contact 9; as Figure 7 As shown, the contact system 8 includes a contact support 8a, a moving contact 8b, a contact spring 8c, and a toggle lever 8d.

[0042] The contact support 8a is slidably installed in the slide groove 1a and can move linearly along the slide groove 1a (the contact support 8a is a long strip plate). The bottom of the contact support 8a is concave to form a horizontally arranged mounting groove 8e (arranged along the line connecting the shaft 5a and the contact point of the stationary contact 9). A connecting hole is provided on the left side of the contact support 8a; the connecting hole is rotatably connected to the right end of the first connecting rod 6. A limiting groove 8f is symmetrically provided on both the front and rear sides of the mounting groove 8e of the contact support 8a.

[0043] The moving contact 8b is slidably installed in the mounting groove 8e with its right end extending out of the mounting groove 8e (its right side slides into the mounting groove 8e, while its left side tapers into a strip or rod shape). Driven by the contact support 8a, the moving contact 8b can move linearly towards or away from the stationary contact 9, thus adhering to or disengaging from the stationary contact. On the moving contact 8a (right side), corresponding to the two limiting grooves 8f, there is a limiting protrusion 8g that can slide left and right within the limiting grooves 8f. Before and during contact between the moving contact 8b and the stationary contact 9, the limiting protrusion 8g remains in contact with the right side of the limiting groove 8f under the action of the contact spring 8c. When the contact support 8a continues to move to the right beyond its travel range, the left side of the limiting groove 8f also continues to move towards the limiting protrusion 8g. The definition of overtravel is: when closing the circuit, to ensure the reliability of the mechanical contact (moving contact 8b and stationary contact 9), the contact support 8a will continue to move a suitable distance to the right, ensuring reliable contact even if the contact wears down.

[0044] The contact spring 8c is installed in the mounting groove 8e and sleeved on the rod-shaped body at the left end of the moving contact 8b. The left end of the contact spring 8c rests on the contact support 8a, and the right end rests on the left side of the moving contact 8b. When the moving contact 8b contacts the stationary contact 9, the contact support 8a continues to move to the right. The contact support 8a and the stationary contact 9 work together to push the moving contact 8b to compress the contact spring 8c, and the contact spring 8c stores energy.

[0045] The left end of the toggle lever 8d is fixed to the contact support 8a (fixed on the top right side of the contact support 8a, corresponding to the position of the micro switch 10), while its right end is linked with the micro switch 10. When the contact support 8a slides along the slide groove 1a, the contact support 8a drives the toggle lever 8d to slide left and right, so that the toggle lever 8d touches the contact of the micro switch 10, thereby causing the micro switch 10 to send an opening signal or an closing signal to the MCU microcontroller, and the MCU microcontroller controls the solid-state switch to turn on or off.

[0046] like Figure 1-3 As shown, the left end of the first connecting rod 6 is rotatably connected to the second through hole 5d of the connecting plate 5, and the right end is rotatably connected to the connecting hole of the contact support 8a.

[0047] like Figure 1 and Figure 3 As shown, the micro switch 10 is mounted on the PCB circuit board and located on the right side of the contact system 8. The micro switch 10 is linked with the contact system 8 and is used to send the opening and closing signals to the MCU microcontroller.

[0048] The solid-state switch (such as a relay) is installed inside the housing 1 (the two terminals of the solid-state switch are connected to the input and output terminals of the circuit breaker respectively), and is used to connect or disconnect the input and output terminals of the circuit breaker under the control of the MCU microcontroller, so as to close or open the plug-in circuit breaker.

[0049] When the moving contact 8b of the contact system 8 contacts the stationary contact 9, the right arm of the reset torsion spring 11 moves closer to its left arm, and the reset torsion spring 11 stores energy; when the contact system 8 separates from the stationary contact 9, the reset torsion spring 11 releases energy, and the right arm of the reset torsion spring 11 opens to the right and pushes the transmission plate 5 to rotate clockwise.

[0050] like Figure 1-3 As shown, the left end of the handle 2 is located outside the outer shell 1, while its right end is slidably installed inside the outer shell 1 and can move linearly inside the outer shell 1. By pushing and pulling the handle 2, the transmission plate 5 can be driven to rotate counterclockwise or clockwise.

[0051] like Figure 1-3 As shown, the two ends of the second connecting rod 3 are rotatably connected to the third through hole 5e at the lower right of the handle 2 and the lower left of the transmission plate 5, respectively. Both the first connecting rod 6 and the second connecting rod 3 are U-shaped rods.

[0052] When the first through hole 5c, the second through hole 5d, the first connecting rod 6, and the moving contact 8b are collinear, the moving contact 8b and the stationary contact 9 are in contact with each other. The return torsion spring 11 and the contact spring 8c are both in a stored state. If the transmission plate 5 continues to rotate counterclockwise under the action of external force, it will pull the contact support 8a of the first connecting rod 6 to slide away from the stationary contact 9, causing the second through hole 8d to move above the first through hole 8c and the slide groove 1a. At this time, the return torsion spring 11 and the contact spring 8c are still in a compressed state. 1 (compression) and contact spring 8c (reset torsion spring 11) both apply a thrust to transmission plate 5. The torque applied by contact spring 8c to transmission plate 5 is opposite in direction to the torque applied by reset torsion spring 11 to transmission plate 5, and the torque applied by contact spring 8c to transmission plate 6 is greater than the torque applied by reset torsion spring 11 to transmission plate 5. When the external force disappears, transmission plate 5 will continue to rotate counterclockwise under the action of contact spring 8c, while moving contact 8b continues to maintain contact with stationary contact 9 under the action of contact spring 8c.

[0053] The working principle is as follows:

[0054] Manual closing:

[0055] like Figure 1 As shown, the circuit breaker is in the open state. At this time, pressing the handle 2 will link the second linkage 3, the transmission plate 5, the first linkage 6, and the contact system 8. The contact system 8 will move linearly to the right in the slide groove 1a of the outer casing 1, causing the circuit breaker to close.

[0056] Specifically: From Figure 1 When the circuit breaker is in the open position, press the handle 2 to slide it to the right. This will push the transmission plate 5 to rotate counterclockwise around the shaft 5a via the second connecting rod 3. Simultaneously, the rotation of the transmission plate 5 will cause the contact system 8 to move to the right via the first connecting rod 6. When the transmission plate 5 moves to the point where the first through hole 5c (or shaft 5a), the second through hole 5d, the first connecting rod 6, and the contact system 8 are collinear (e.g., ...), the circuit breaker will move to the point where the first through hole 5c (or shaft 5a), the second through hole 5d, the first connecting rod 6, and the contact system 8 are collinear (e.g., ...). Figure 2As shown), at this time, the moving contact 8b and the stationary contact 9 are closed (in contact) and in a compressed state, but the mechanism is not locked; continue to press the handle 2, so that the transmission plate 5 continues to rotate counterclockwise and drives the left end of the first connecting rod 6 to move upward, and pulls the contact support 8a to move to the left (the moving contact 8b no longer moves and remains in contact with the stationary contact 9 when the contact spring 8c stops moving), the contact spring 8c releases energy and extends (applying a leftward thrust to the transmission plate 5), while the return torsion spring 11 is compressed and stores energy. After the transmission plate 5 rotates to a certain position (at this time, the second through hole 8d is higher than the first through hole 8c and the contact system), 8) The torque applied by the contact spring 8c to the transmission plate 5 is greater than the torque applied by the return torsion spring 11 to the transmission plate 5 (the two torques are in opposite directions). At this time, the closing process does not require pressing the handle 2 to apply force. The handle 2 is stopped, the contact spring 8c further releases energy and extends, pushing the contact support 8a further to the left, and the first connecting rod 6 further pushes the transmission plate 5 to continue rotating counterclockwise until the transmission plate 5 is locked onto the protruding rib 1b of the outer casing 1. At the same time, the contact spring 8c also pushes the moving contact 8b to the right, ensuring reliable contact with the stationary contact 9. At this time, the circuit breaker closes (e.g., Figure 3 (As shown).

[0057] Furthermore, before the moving contact 8b closes (makes contact) with the stationary contact 9, the toggle lever 8d has already actuated the micro switch 10 (e.g., Figure 3 As shown), the micro switch 10 sends a closing signal to the MCU microcontroller. The MCU microcontroller delays the solid-state switch to turn on until the moving contact 8b closes (makes contact) with the stationary contact 9, triggering the electronic solid-state switch to turn on.

[0058] Manual tripping:

[0059] like Figure 3 As shown, when the circuit breaker is in the closed state, pulling the handle 2 will link the second link 3, the transmission plate 5, the first link 6, and the contact system 8. The contact system 8 will move linearly to the left in the slide groove 1a of the outer casing 1, causing the circuit breaker to open.

[0060] Specifically: From Figure 3When the circuit breaker is in the closed state, pull handle 2 to slide it to the left. This causes the transmission plate 5 to rotate clockwise around shaft 5a via the second link 3. Simultaneously, the rotation of transmission plate 5 pushes contact system 8 to the right via the first link 6. When transmission plate 5 reaches a point where the first through hole 5c (or shaft 5a), second through hole 5d, first link 6, and contact system 8 are collinear, the moving contact 8b remains in contact with the stationary contact 9. The reset torsion spring 11 and contact spring 8c remain compressed, but the torque exerted by contact spring 8c on transmission plate 5 is less than the reset torque. The torque applied by the torsion spring 11 to the transmission plate 5 (the two torques are in opposite directions) means that the torque exerted by the contact spring 8c on the transmission plate 5 no longer has the function of preventing the transmission plate 5 from moving. Since the torque applied by the reset torsion spring 11 to the transmission plate 5 is always the torque in the opening direction, further, by continuing to pull the handle 2, the torque exerted by the reset torsion spring 11 on the transmission plate 5 further pushes the transmission plate 5 to rotate clockwise (causing the left end of the first connecting rod 6 to move down and pull the contact system 8 to move to the left, causing the moving contact 8b to disengage from the stationary contact 9, and the circuit breaker to open). Figure 1 (As shown).

[0061] In addition, before the moving contact 8b and the stationary contact 9 are separated, the toggle lever 8d has already activated the micro switch 10. The micro switch 10 sends the trip signal to the MCU microcontroller, which controls the solid-state switch to open. Only after the electronic solid-state switch is triggered to open will the moving contact 8b and the stationary contact 9 be completely separated.

[0062] Example 2:

[0063] The difference between this embodiment and Embodiment 1 is that:

[0064] To ensure that the plug-in circuit breaker can automatically trip under conditions such as overload, short circuit, over / under voltage, etc., Figure 1-3 As shown, the plug-in circuit breaker also includes a trip unit 7. (As...) Figure 8 , Figure 9 As shown, the trip unit 7 includes a housing 7a, a moving iron core 7b, a stationary iron core 7e, a coil 7d, a push rod 7f, a reset spring 7c, and the stationary iron core 7e are all made of soft iron or silicon steel.

[0065] The housing 7a is installed inside the outer shell 1. The left end of the housing 7a is open and faces the transmission plate 5 (lower right end), and it is cylindrical.

[0066] The stationary iron core 7e is a cylinder fixed inside the left side of the housing 7a and connected to the opening of the housing 7a.

[0067] The moving iron core 7b is a cylinder located inside the right side of the housing 7a and capable of sliding within the housing 7a.

[0068] The coil 7d is wound around the outer casing 7a, and can be energized or de-energized under the control of the MCU microcontroller. The two ends of the coil 7d are connected to a preset relay, which is installed inside the casing 1 and switched on and off under the control of the MCU microcontroller, thus energizing or de-energizing the coil 7d.

[0069] The push rod 7f is located inside the housing 7a, and its two ends are respectively sleeved in the moving iron core 7b and the stationary iron core 7e and can move left and right in the stationary iron core 7e. The right end of the push rod 7f is fixed in the moving iron core 7b and can move back and forth driven by the moving iron core 7b.

[0070] The reset spring 7c is sleeved outside the top rod 7f and located between the moving iron core 7b and the stationary iron core 7e, and its diameter is larger than the inner diameter of the moving iron core 7b.

[0071] In case of emergency such as overload, short circuit, or over / under voltage, the MCU microcontroller sends a trip signal to control the relay to connect coil 7d. After coil 7d is energized, it generates a magnetic field, causing the moving iron core 7b and the stationary iron core 7e (magnetized) to attract each other. Under the attraction of the stationary iron core 7e, the moving iron core 7b overcomes the spring force of the return spring 7c and moves towards the stationary iron core 7e, pushing the push rod 7f to the left, passing through the stationary iron core 7e and extending out of the housing 7a. This, in turn, causes the push rod 7f to push the transmission plate 5 clockwise. When the transmission plate 5 moves to the point where the second through hole 5d is collinear with the first through hole 5c, the moving iron core still has a travel distance. This travel distance is the design margin. Since the torque applied to the transmission plate 5 by the contact spring 8c is less than the torque applied to the transmission plate 5 by the reset torsion spring 11, the transmission plate 5 will automatically rotate clockwise under the action of the reset torsion spring 11 and pull the contact system 8 to disengage from the stationary contact 9, so that the plug-in circuit breaker will trip and open. Therefore, at this time, it is no longer necessary to use the trip unit 7 to achieve the mechanism opening.

[0072] After the coil 7c is de-energized, the moving iron core 7b and the stationary iron core 7e lose their magnetic force. The moving iron core 7b will move away from the stationary iron core 7e under the action of the reset spring 7c and drive the push rod 7f to retract back into the housing 7a.

[0073] Example 3:

[0074] The difference between this embodiment and Embodiment 1 or Embodiment 2 is that:

[0075] To prevent the circuit breaker from being accidentally closed before being inserted into the cabinet, such as Figure 1-3 As shown, the plug-in circuit breaker also includes an anti-misclosing mechanism, as shown in the figure. Figure 10 , Figure 11 As shown, the anti-misoperation closing mechanism includes a through hole 1c, a pin 4a, a connecting rod 4b, a buckle 4c, a first locking hook 4d, a second locking hook 5b, and a locking torsion spring 4e.

[0076] The through hole 1c is provided on the outer shell 1 and located above the shaft 5a, serving as the passage for the buckle 4c to enter and exit.

[0077] The pin 4a is vertically installed inside the housing a and located to the left of the through hole 1c, and is used to install the connecting rod 4b and the locking torsion spring 4e.

[0078] The left end of the connecting rod 4b is rotatably mounted outside the pin 4a.

[0079] The buckle 4c is fixed to the right end of the connecting rod 4b and extends out of the outer shell 1 through the through hole 1c (and can rotate with the connecting rod 4b). The left side of the buckle 4c is inclined and can be pressed into the outer shell 1 under the action of external force, causing the connecting rod 4b to rotate clockwise.

[0080] The first locking hook 4d is fixed to the left end (lower side) of the connecting rod 4b with its hook face upward.

[0081] The second locking hook 5b is fixed on the transmission plate 5 with its hook face downward. The second locking hook 5b is located above the first locking hook 4d and cooperates with the first locking hook 4d.

[0082] The locking torsion spring 4e is sleeved on the pin 4a and also has two rotating arms. Its left rotating arm is locked on the outer shell 1 and its right rotating arm is locked on the buckle 4c.

[0083] Before the plug-in circuit breaker is inserted into the cabinet, the buckle 4c extends out of the through hole 1c, and the connecting rod 4b is pressed against the inner side of the outer casing z under the action of the locking torsion spring 4e. The second locking hook 5b and the first locking hook 4a are interlocked. The transmission plate 5 is difficult to rotate counterclockwise under the action of external force and drives the contact system 8 to move to the right to close the circuit through the first connecting rod 6.

[0084] After the plug-in circuit breaker is inserted into the cabinet, the latch 4c is pressed into the outer shell 1 by the cabinet and drives the connecting rod 4b to rotate clockwise (at the same time, the two rotating arms of the locking torsion spring 4e approach each other, and the locking torsion spring 4e is compressed and stored). This drives the first locking hook 4d to rotate clockwise and disengage from the second locking hook 5b, and the transmission plate 5 is in a state where it can rotate freely.

[0085] After the plug-in circuit breaker is removed from the cabinet, the latch 4c is no longer obstructed by the cabinet. Under the action of the locking torsion spring 4e, it moves upward and extends out of the outer shell 1 from the through hole 1c until the connecting rod 4b is pressed against the inner side of the outer shell 1 again. At the same time, the locking torsion spring 4e drives the connecting rod 4b to rotate counterclockwise and drives the first locking hook 4d to rotate counterclockwise and re-engage with the second locking hook 5b, so that the transmission plate 5 is locked again and it is difficult to rotate counterclockwise under the action of external force. Through the first connecting rod 6, the contact system 8 is driven to move to the right to close the circuit.

[0086] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0087] The scope of protection of this invention is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this invention shall fall within the scope of protection of this invention.

Claims

1. A plug-in circuit breaker, comprising a hollow housing serving as a load-bearing base, characterized in that: It also includes a transmission plate, a return torsion spring, a stationary contact, a contact system, and a first connecting rod; The housing is provided with a horizontally arranged sliding groove and a vertically installed shaft inside the housing; the shaft is located on the left side of the sliding groove; The transmission plate is located inside the outer casing. The transmission plate is provided with a first through hole and a second through hole, with the second through hole located to the right of the first through hole. The transmission plate is sleeved on the outside of the shaft through the first through hole and can rotate around the shaft under the action of external force. The reset torsion spring is sleeved outside the shaft and has two rotating arms. The left rotating arm is locked on the inner wall of the housing, while the right rotating arm is locked on the transmission plate. The stationary contact is disposed inside the housing and located on the right side of the slide groove; The contact system is installed in the slide groove and can move linearly along the slide groove, so that the contact system can contact or separate from the stationary contact. The left end of the first connecting rod is rotatably connected to the second through hole, and the right end is rotatably connected to the contact system; When the contact system contacts the stationary contact, the right arm of the return torsion spring moves closer to its left arm, and the return torsion spring stores energy; when the contact system separates from the stationary contact, the return torsion spring releases energy, and the right arm of the return torsion spring opens to the right and pushes the transmission plate to rotate clockwise; It also includes a PCB circuit board installed inside the housing, an MCU microcontroller installed on the PCB circuit board, a micro switch, and a solid-state switch; the micro switch is installed on the PCB circuit board and located on the right side of the contact system. The micro switch is linked with the contact system and is used to send the opening and closing signals to the MCU microcontroller. The solid-state switch is installed inside the housing and is used to connect or disconnect under the control of the MCU microcontroller, so as to close or open the plug-in circuit breaker.

2. The plug-in circuit breaker according to claim 1, characterized in that: The first through hole is collinear with the groove.

3. The plug-in circuit breaker according to claim 2, characterized in that: The contact system includes a contact support, a moving contact, a contact spring, and a toggle lever; The contact support is slidably installed in the slide groove and can move linearly along the slide groove. The bottom of the contact support is concave to form a horizontally set mounting groove. A connecting hole is provided on the left side of the contact support. The connecting hole is rotatably connected to the right end of the first connecting rod. The moving contact is slidably installed in the mounting groove and its right end extends out of the mounting groove. The moving contact can move in a straight line towards or away from the stationary contact under the support of the contact, thereby sticking to or separating from the stationary contact. The contact spring is installed in the mounting groove and sleeved on the left end of the moving contact. The left end of the contact spring rests against the contact support, and the right end rests against the left side of the moving contact. The left end of the toggle lever is fixed to the contact support, while its right end is linked to the micro switch. When the contact support slides along the groove, it drives the toggle lever to slide left and right, causing the toggle lever to touch the micro switch contact. The micro switch sends an opening signal or an closing signal to the MCU microcontroller, which then controls the solid-state switch to turn on or off.

4. The plug-in circuit breaker according to claim 3, characterized in that: When the first through hole, the second through hole, the first connecting rod, and the moving contact are collinear, the moving contact and the stationary contact are in contact with each other. The return torsion spring and the contact spring are both in an energy storage state. If the transmission plate continues to rotate counterclockwise under the action of external force, it will pull the first connecting rod contact support to slide away from the stationary contact, so that the second through hole moves above the first through hole and the slide groove. At this time, the return torsion spring and the contact spring are still in a compressed state. At the same time, the return torsion spring and the contact spring both apply a thrust to the transmission plate. The torque applied by the contact spring to the transmission plate is opposite in direction to the torque applied by the return torsion spring to the transmission plate, and the torque applied by the contact spring to the transmission plate is greater than the torque applied by the return torsion spring to the transmission plate. When the external force disappears, the transmission plate will continue to rotate counterclockwise under the action of the contact spring, and the moving contact will continue to maintain contact with the stationary contact under the action of the contact spring.

5. The plug-in circuit breaker according to claim 4, characterized in that: The housing has a raised rib that locks the transmission plate to prevent it from rotating excessively counterclockwise under the push of the contact spring.

6. The plug-in circuit breaker according to claim 3, characterized in that: A limiting groove is provided symmetrically on both the front and rear sides of the mounting groove supporting the contact; a limiting protrusion is provided on the moving contact corresponding to the two limiting grooves, which can slide left and right in the limiting groove.

7. The plug-in circuit breaker according to claim 1, characterized in that: It also includes a trip unit, which comprises a housing, a moving iron core, a stationary iron core, a coil, a push rod, and a return spring; The housing is installed inside the outer casing, with an opening at the left end of the housing facing the transmission plate; The stationary iron core is a cylinder fixed inside the left side of the shell and connected to the opening of the shell; The moving iron core is a cylindrical body that is located on the right side inside the housing and can slide inside the housing; The coil is wound around the outside of the housing, and the coil can be energized or de-energized under the control of the MCU microcontroller; The push rod is located inside the housing, and its two ends are respectively sleeved in the moving iron core and the stationary iron core and can move left and right in the stationary iron core. The right end of the push rod is fixed in the moving iron core and can move back and forth driven by the moving iron core. The reset spring is sleeved outside the top rod and located between the moving iron core and the stationary iron core, and its diameter is larger than the inner diameter of the moving iron core; After the coil is energized, the moving iron core and the stationary iron core generate a magnetic force that attracts each other. The moving iron core will overcome the spring force of the reset spring and move towards the stationary iron core, pushing the push rod to extend out of the housing to the left, thereby pushing the transmission plate to rotate clockwise, causing the plug-in circuit breaker to trip and open. After the coil is de-energized, the moving iron core and the stationary iron core lose their magnetic force. The moving iron core will move away from the stationary iron core under the action of the reset spring and drive the push rod to retract back into the housing.

8. The plug-in circuit breaker according to claim 1, characterized in that: It also includes a handle and a second connecting rod; the left end of the handle is located outside the housing, while its right end is slidably installed inside the housing and can move linearly inside the housing; the two ends of the second connecting rod are respectively rotatably connected to the lower right part of the handle and the lower left part of the transmission plate.

9. The plug-in circuit breaker according to any one of claims 1-8, characterized in that: It also includes an anti-misoperation closing mechanism, which includes a through hole, a pin, a connecting rod, a buckle, a first locking hook, a second locking hook, and a locking torsion spring; The through hole is provided on the outer casing and located above the shaft; The pin is vertically installed inside the housing and located on the left side of the through hole; The left end of the connecting rod is rotatably mounted outside the pin. The buckle is fixed to the right end of the connecting rod and extends out of the outer shell through the through hole. The left side of the buckle is inclined and can be pressed into the outer shell under external force, causing the connecting rod to rotate clockwise. The first locking hook is fixed to the left end of the connecting rod with its hook face upward; The second locking hook is fixed to the transmission plate with its hook face down, and the second locking hook is located above the first locking hook and cooperates with the first locking hook; The locking torsion spring is sleeved on the pin and also has two rotating arms. Its left rotating arm is locked on the outer shell and its right rotating arm is locked on the buckle. Before the plug-in circuit breaker is inserted into the cabinet, the latch extends out of the through hole, and the connecting rod is pressed against the inner side of the housing under the action of the locking torsion spring. The second locking hook and the first locking hook are interlocked. The transmission plate is difficult to rotate counterclockwise under the action of external force and drives the contact system to move to the right to close the circuit through the first connecting rod. After the plug-in circuit breaker is inserted into the cabinet, the latch is pressed into the housing by the cabinet and drives the connecting rod to rotate clockwise, which drives the first locking hook to rotate clockwise and disengage from the second locking hook. The transmission plate is in a state where it can rotate freely.

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