A circuit breaker mechanical switch device

Abstract

This invention provides a mechanical switching device for a circuit breaker, comprising a housing, a handle, an upper locking latch, a first torsion spring, a stationary contact, a contact system, a connecting rod, a button, a lower locking latch, and a second torsion spring. The housing contains a first mounting post, a second mounting post, and a sliding groove. The right end of the handle is rotatably connected to the first mounting post. The upper locking latch is fixed to the right end of the handle. The first torsion spring is sleeved on the first mounting post. The stationary contact is located inside the housing and on the right side of the sliding groove. The contact system is installed within the sliding groove. Both ends of the connecting rod are rotatably connected to the upper locking latch and the contact system, respectively. The lower locking latch is connected to the second mounting post and can engage with the hook surface of the upper locking latch. A push plate is provided behind the lower locking latch. The button is located below the handle, with its right end facing the push plate. The second torsion spring is sleeved on the second mounting post. Compared to traditional switching mechanisms, this invention has a simpler structure, minimal or no wear during opening, closing, and tripping, resulting in a longer mechanical lifespan and more reliable overall performance.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage electrical appliance technology, specifically relating to a mechanical switching device for a 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 mechanical switching device for circuit breakers. This new device would use a solid-state switch to handle the energy generated during connection and disconnection, while the mechanical switch within the circuit breaker itself would only be used for isolation and would not 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 circuit breaker mechanical switching device that is simple in structure, easy to operate, and reliable in performance.

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

[0005] A mechanical switching device for a circuit breaker includes a hollow outer shell serving as a supporting base, characterized in that it further includes a handle, a locking latch, a first torsion spring, a stationary contact, a contact system, a connecting rod, a button, a lower locking latch, and a second torsion spring; the inner surface of the outer shell has a first mounting post, a second mounting post, and a sliding groove; the first mounting post is vertically disposed on the left side of the outer shell, the sliding groove is horizontally disposed on the left side of the first mounting post, and the second mounting post is vertically disposed below the sliding groove; the right end of the handle is rotatably connected to the first mounting post, and the left end extends to the left outside the outer shell; the upper locking latch is fixed to the right end of the handle and is hook-shaped with its hook face facing the clockwise rotation direction of the handle; the first torsion spring is sleeved on the first mounting post and has two rotating arms, the left rotating arm of which is engaged with the inner wall of the outer shell, and the right rotating arm of which is engaged with the upper locking latch and can push the upper locking latch to rotate clockwise in an energy-storing state; the stationary contact is disposed inside the outer shell and located on the right side of the sliding groove; the contact system is installed in the sliding groove and can move linearly along the sliding groove, so that the contact system... The circuit breaker contacts or separates from the stationary contact, causing the circuit breaker to open or close; the two ends of the linkage are rotatably connected to the upper latch and the contact system, respectively; the lower latch is laterally rotatably connected to the second mounting post and located below the handle and contact system, with its left end in a hook shape, the hook face of the lower latch facing upwards and able to engage with the hook face of the upper latch; a push plate is provided on the rear side of the lower latch, the left side of the push plate is inclined from the lower left to the upper right and the lower end of the push plate extends beyond the lower latch; the button is laterally rotatable to the left and right. The button is located below the handle and behind the lower latch. The left end of the button is outside the housing, while the right end is directly opposite the lower left side of the push plate. Pressing the button to the right will cause the push plate to rotate and drive the lower latch to rotate counterclockwise and disengage from the upper latch. The second torsion spring is sleeved on the second mounting post and has two rotating arms. The right rotating arm is locked on the inner wall of the housing, while the left rotating arm is locked on the lower latch located on the left side of the second mounting post and can push the lower latch to rotate clockwise in the stored state.

[0006] Furthermore, a limiting surface is provided on the left side of the outer casing to prevent the handle from rotating excessively counterclockwise.

[0007] Furthermore, the contact system includes a contact support, a moving contact, a contact spring, and a toggle rod. 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 it is rotatably connected to the right end of the first connecting rod on the left side of the contact support. 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 rod is fixed to the contact support, while its right end drives the circuit breaker to open or close.

[0008] 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.

[0009] Furthermore, the surface of the upper latch away from the handle is inclined; the surface of the lower latch facing the handle is also inclined, to ensure that when the switch is closed, after the handle drives the upper latch to rotate counterclockwise, the surface of the upper latch away from the handle can slide over the surface of the lower latch facing the handle, so that the hook surface of the upper latch can be fastened to the hook surface of the lower latch, thus realizing the latching of the upper and lower latches.

[0010] Furthermore, the left half of the button is cylindrical, and the right half is conical. The diameter of the left end of the right half is larger than the diameter of the left half. A guide hole corresponding to the left half of the button is provided on the outer casing to mate with the left half of the button. At the same time, a pressing head with a diameter larger than that of the left half of the button is provided at the left end of the button.

[0011] Furthermore, the circuit breaker mechanical switching device 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 and located below the right end of the lower latch. The left end of the housing is open, and the opening faces the lower side of the right end of the lower latch. The stationary iron core is a cylinder fixed inside the upper side of the housing and communicating with the housing opening. The moving iron core is a cylinder located inside the lower side of the housing and can slide inside the housing. The coil is wound around the outside of the housing. The push rod is located inside the housing, and its two ends are respectively sleeved inside the moving iron core and the stationary iron core and can move up and down inside the stationary iron core. The end is fixed inside the moving iron core and can move up and down under the drive of the moving iron core; the return 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 return spring and move towards the stationary iron core and push the top rod upward to extend out of the housing, and then push the lower latch upward to rotate counterclockwise, so that the upper latch and the lower latch are disengaged, thereby causing the plug-in circuit breaker to trip; 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 downward under the action of the return spring and drive the top rod to retract back into the housing.

[0012] Furthermore, a protective sleeve is provided outside the housing to enclose the coil and the housing, and the upper end of the protective sleeve has an opening for the top rod to extend upward.

[0013] The structure of this invention differs from that of traditional switching mechanisms. Compared to traditional switching mechanisms, it has a simpler structure, minimal or no wear during opening, closing, and tripping, resulting in a longer mechanical lifespan and more reliable overall performance. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the mechanical switching device of the circuit breaker according to the present invention;

[0016] Figure 2 for Figure 1 Front view;

[0017] Figure 3 This is a schematic diagram of the structure of the outer casing of the circuit breaker mechanical switching device described in this invention;

[0018] Figure 4 This is a diagram showing the positional relationship between the button and the upper push plate of the lower latch in the mechanical switch device of the circuit breaker described in this invention;

[0019] Figure 5 This is a schematic diagram of the contact system in the mechanical switching device of the circuit breaker described in this invention;

[0020] Figure 6 This is a schematic diagram of the trip unit in the mechanical switching device of the circuit breaker described in this invention;

[0021] The figure shows: 1-housing, 2-handle, 3-locking buckle, 4-first torsion spring, 5-second torsion spring, 6-linkage rod, 7-lower locking buckle, 8-tripper, 9-contact system, 10-stationary contact, 11-button, 12-micro switch. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Example 1:

[0026] like Figure 1-6 As shown, a mechanical switch device for a circuit breaker according to the present invention includes a housing 1, a handle 2, an upper locking latch 3, a first torsion spring 4, a stationary contact 10, a contact system 9, a connecting rod 6, a button 11, a lower locking latch 7, and a second torsion spring 5. The mechanical switch device works in conjunction with a PCB circuit board, an MCU microcontroller, a micro switch 12, and a solid-state switch disposed within the housing of the intelligent circuit breaker. The micro switch 12 is mounted on the PCB circuit board and located to the right of the contact system 9. The micro switch 12 is linked with the contact system 9 to send opening and closing signals to the MCU microcontroller. The solid-state switch is installed inside the housing 1 and is used to connect or disconnect the incoming and outgoing terminals under the control of the MCU microcontroller, thereby closing or opening the plug-in circuit breaker.

[0027] like Figure 1-3 As shown, the outer casing 1 serves as the supporting base for the various components inside the circuit breaker. Inside the outer casing 1 are a first mounting post 1a, a second mounting post 1b, and a sliding groove 1c (as shown). Figure 3 (As shown). The first mounting post 1a is vertically disposed on the left side of the outer casing 1, the slide groove 1c is horizontally disposed on the left side of the first mounting post 1a, and the second mounting post 1b is vertically disposed below the slide groove 1c (left side). A limiting surface 1d is provided on the left side of the outer casing 1 to limit the excessive counterclockwise rotation of the handle 2.

[0028] like Figure 1-3 As shown, the right end of the handle 2 is rotatably connected to the first mounting post 1a, the left end of the handle 2 extends to the left outside the outer shell 1, and the right end of the handle 2 is cylindrical and rotatably sleeved on the outside of the first mounting post 1a. By moving the left end of the handle 2 up and down, the handle 2 can rotate around the first mounting post 1a.

[0029] like Figure 1 As shown, the upper locking buckle 3 is fixed to the right end of the handle 2 and is hook-shaped, with its hook surface (fastening surface) facing the clockwise rotation direction of the handle 2, and can rotate around the first mounting post 1a with the right end of the handle 2.

[0030] like Figure 1As shown, the first torsion spring 4 is sleeved on the first mounting post 1a and has two rotating arms (in a V shape). The left rotating arm is locked on the inner wall of the outer casing 1, while the right rotating arm is locked on the upper locking buckle 3 and can push the upper locking buckle 3 to rotate clockwise in the energy storage state.

[0031] like Figures 1-3 As shown, the stationary contact 10 is disposed inside the housing 1 and located on the right side of the slide groove 1c, and its left contact point is collinear with the moving contact 9b.

[0032] like Figure 1 , Figure 2 , Figure 5 As shown, the contact system 9 is installed in the slide groove 1c and can move linearly along the slide groove 1c, so that the contact system 9 contacts or separates from the stationary contact 10, thereby causing the circuit breaker to open or close.

[0033] like Figure 5 As shown, the contact system 9 includes a contact support 9a, a moving contact 9b, a contact spring 9c, and a toggle lever 9d.

[0034] The contact support 9a is slidably installed in the slide groove 1c and can move linearly along the slide groove 1c (the contact support 9a is a long strip plate). The bottom of the contact support 9a is concave to form a horizontally set mounting groove 9e. The left side of the contact support 9a is rotatably connected to the right end of the connecting rod 6 through a hole set thereon. A limiting groove 9f is symmetrically provided on both the front and rear sides of the mounting groove 9e of the contact support 9a.

[0035] The moving contact 9b is slidably installed in the mounting groove 9e and extends out of the mounting groove 9e at its right end (its right side slides in conjunction with the mounting groove 9e, while its left side tapers into a strip or rod shape). The moving contact 9b can move linearly towards or away from the stationary contact 10 under the action of the contact support 9a, thereby adhering to or disengaging from the stationary contact 10. On the moving contact 9b (right side), corresponding to the two limiting grooves 9f, there is a limiting protrusion 9g that can slide left and right in the limiting groove 9f. Before and during contact between the moving contact 9b and the stationary contact 10, the limiting protrusion 9g is kept in contact with the right side of the limiting groove 9f under the action of the contact spring 9c. When the contact support 9a continues to move to the right beyond its travel, the left side of the limiting groove 9f also continues to move towards the limiting protrusion 9g. The definition of overtravel is: when closing the circuit, in order to ensure the reliability of the mechanical contact (moving contact 9b and stationary contact 10), the contact support 9a will continue to move to the right a suitable distance, and even if the contact is worn, the mechanical contact will still make reliable contact.

[0036] The contact spring 9c is installed in the mounting groove 9e and sleeved on the left end of the moving contact 9b. The left end of the contact spring 9c rests against the contact support 9a, and the right end rests against the left side of the moving contact 9b. When the moving contact 9b contacts the stationary contact 10, the contact support 9a continues to move to the right. The contact support 9a and the stationary contact 10 work together to push the moving contact 9a to compress the contact spring 9c, and the contact spring 9c stores energy.

[0037] The left end of the actuating lever 9d is fixed to the contact support 9a (fixed on the top right side of the contact support 9a, corresponding to the position of the micro switch 12), while its right end is linked with the micro switch 12 to drive the circuit breaker to open or close. When the contact support 9a slides along the slide groove 1c, the contact support 9a drives the actuating lever 9d to slide left and right, causing the actuating lever 9d to touch the contact of the micro switch 12, thereby causing the micro switch 12 to send an open or close signal to the MCU microcontroller. The MCU microcontroller controls the solid-state switch to open or close, realizing the opening and closing of the circuit breaker.

[0038] like Figure 1 As shown, the two ends of the connecting rod 6 are rotatably connected to the upper locking buckle 3 and the contact system 9 (the left end of the contact support 9a), respectively. The connecting rod 6 is a U-shaped rod.

[0039] like Figure 1 As shown, the lower latch 7 is laterally rotatably connected to the second mounting post 1b and located below the handle 2 and contact system 9, with its left end in a hook shape. The hook surface (fastening surface) of the lower latch 7 faces upward and can engage with the hook surface of the upper latch 3. Figure 4 As shown, a push plate 7a is provided on the rear side of the lower latch 7. The left side of the push plate 7a is inclined from the lower left to the upper right and the lower end of the push plate 7a extends beyond the lower side of the lower latch 7 (to ensure that the button 11 can push the push plate 7a to rotate counterclockwise).

[0040] like Figure 1 and Figure 2 As shown, the surface of the upper locking buckle 3 away from the handle 3 is an inclined surface; the surface of the lower locking buckle 7 facing the handle is also an inclined surface, so as to ensure that when the circuit is closed, after the handle 2 drives the upper locking buckle 3 to rotate counterclockwise, the surface of the upper locking buckle 3 away from the handle can stably slide over the surface of the lower locking buckle 7 facing the handle, so that the hook surface of the upper locking buckle 3 can be fastened to the hook surface of the lower locking buckle 7, thereby realizing the latching of the upper locking buckle 3 and the lower locking buckle 7.

[0041] like Figure 2 and Figure 4 As shown, the button 11 is horizontally movable and positioned below the handle 2 and behind the lower latch 7; the left end of the button 11 is located outside the outer casing 1, while its right end faces the lower left side of the push plate 7a and can push the push plate 7a to rotate counterclockwise, thereby causing the lower latch 7 to rotate counterclockwise; pressing the button 11 to the right causes the button 11 to push the push plate 7a to rotate counterclockwise and cause the lower latch 7 to rotate counterclockwise and disengage from the upper latch 3. Figure 4 As shown, the left half of the button 11 is cylindrical and the right half is conical (thicker on the left and thinner on the right). The diameter of the left end of the right half is larger than the diameter of the left half. A guide hole is provided on the outer shell 1 corresponding to the left half of the button 11 to ensure that the button 11 can move in a straight line in a stable direction towards the push plate. At the same time, a pressing head with a diameter larger than that of the left half of the button 11 is provided at the left end of the button 11.

[0042] like Figure 1 As shown, the second torsion spring 5 is sleeved on the second mounting post 1b and has two rotating arms (in an inverted V shape). The right rotating arm is locked on the inner wall of the outer casing 1, while the left rotating arm is locked on the lower latch 7 located on the left side of the second mounting post 1b and can push the lower latch 7 to rotate clockwise in an energy storage state.

[0043] The working principle is as follows:

[0044] Manual tripping:

[0045] like Figure 1 As shown, the circuit breaker is in the closed state at this time. The first torsion spring 4 is in the energy storage state and gives the handle and the upper locking latch a clockwise torque (opening direction). The upper locking latch 3 and the lower locking latch 7 are locked together. Pressing the button 11 moves the button 11 to the right, pushing the push plate 7a to rotate counterclockwise, and at the same time driving the lower locking latch 7 to rotate counterclockwise, so that the lower locking latch 7 and the upper locking latch 3 are unlocked (after unlocking, the lower locking latch 7 rotates clockwise to reset under the action of the second torsion spring 5, and at the same time the button 11 moves to the left to reset under the push of the push plate 7a). Under the elastic force of the first torsion spring 4, the upper locking latch 3 rotates clockwise together with the handle 2 and pulls the connecting rod 6 to move to the left. The leftward movement of the connecting rod 6 pulls the contact system 9 to slide to the left, so that the moving contact 9b is disengaged from the stationary contact 10, and the circuit breaker is quickly opened. Due to overtravel, the circuit can be configured such that during the movement of contact 9a in the opening direction (to the left), microswitch 12 is first triggered by toggle lever 9d and sends an opening signal to the MCU microcontroller. At this time, moving contact 9b and stationary contact 10 are not disconnected. The MCU microcontroller receives the signal of the disconnected position of microswitch 12 and controls the solid-state switch to open first. After the solid-state switch opens, moving contact 9b and stationary contact 10 are disconnected (loosened from contact).

[0046] Manual closing:

[0047] When the circuit breaker is in the open state, the first torsion spring 4 is in its natural state. At this time, the drive handle 2 and the locking latch 3 rotate counterclockwise, compressing and storing energy in the first torsion spring 4. The handle 2 and the locking latch 3 drive the connecting rod 6 to move to the right. The connecting rod 6 further pushes the entire contact system 9 to move to the right (closing direction) along the slide groove 1c until the moving contact 9b connects with the stationary contact 10. Before the moving contact 9b connects with the stationary contact 10, the toggle lever 9d, driven by the contact support 9a, actuates the micro switch 12 on the PCB circuit board. The micro switch 12 sends a closing signal to the MCU microcontroller. The MCU microcontroller receives the signal and performs a delay (delayed closing). The solid-state switch is only turned on after the moving contact 9b connects with the stationary contact 10. When handle 2 continues to move counterclockwise (compressing the first torsion spring 4), causing the upper latch 3 to press against the left end of the lower latch 7 (the left end of the lower latch 7 moves counterclockwise against the elastic force of the second torsion spring 5, and the second torsion spring 5 is compressed and stores energy), and moves counterclockwise until the hook surface of the upper latch 3 is located to the right of the hook surface of the lower latch 7 (at the same time, handle 2 is restricted by the limiting surface 1d and can no longer drive the upper latch 3 to rotate counterclockwise), the upper latch 3 no longer presses against the lower latch 7, the second torsion spring 5 releases energy, and pushes the lower latch 7 to rotate clockwise to reset, so that the lower latch 7 and the upper latch 3 are engaged, and handle 2 is released. Handle 2 and the upper latch 3 rotate clockwise under the action of the first torsion spring, but the upper latch 3 is restricted by the lower latch 7 and can hardly rotate in one step to complete the closing (e.g. Figure 1 (As shown).

[0048] Example 2:

[0049] The difference between this embodiment and Embodiment 1 is that:

[0050] To ensure that the plug-in circuit breaker can automatically trip under conditions such as overload, short circuit, over / under voltage, etc., Figure 1 As shown, the circuit breaker mechanical switching device also includes a trip unit 8, such as... Figure 6 As shown, the trip unit 8 includes a housing 8b, a moving iron core 8d, a stationary iron core 8f, a coil 8c, a push rod 8g, and a return spring 8e. A protective sleeve 8a is also provided outside the housing 8b to enclose the coil 8c and the housing 8b. The protective sleeve 8a is installed inside the outer shell 1, and the upper end of the protective sleeve 8a has an opening for the push rod 8g to extend upward.

[0051] The housing 8b is installed inside the outer shell 1 and is located on the lower right side of the lower latch 7. The left end of the housing 8b is open and the opening faces the lower right side of the lower latch 7.

[0052] The stationary iron core 8f is a cylinder fixed inside the upper side of the housing 8b and connected to the opening of the housing 8b.

[0053] The moving iron core 8d is a cylinder that is located inside the lower side of the housing 8b and can slide within the housing 8b.

[0054] The coil 8c is wound around the outer shell 8b.

[0055] The push rod 8g is located inside the housing 8b, and its two ends are respectively sleeved in the moving iron core 8d and the stationary iron core 8f and can move up and down in the stationary iron core 8f. The lower end of the push rod 8g is fixed in the moving iron core 8d and can move up and down under the drive of the moving iron core 8d.

[0056] The reset spring 8e is sleeved outside the top rod 8g and located between the moving iron core 8d and the stationary iron core 8f, and its diameter is larger than the inner diameter of the moving iron core 8d.

[0057] In case of emergency such as overload, short circuit, over / under voltage, the MCU microcontroller sends a trip signal to control the relay to connect coil 8c. After coil 8c is energized, coil 8c generates a magnetic field, causing the moving iron core 8d and the stationary iron core 8f (magnetized) to attract each other. The moving iron core 8d overcomes the elastic force of the return spring 8e and moves towards the stationary iron core 8f, pushing the top rod 8g upward to extend out of the housing 8b. This pushes the lower latch 7 upward to rotate counterclockwise, causing the upper latch 3 to disengage from the lower latch 7. Under the elastic force of the first torsion spring 4, the upper latch 3 rotates clockwise together with the handle 2, pulling the connecting rod 6 to the left. The leftward movement of the connecting rod also pulls the contact system 9 to slide to the left, causing the moving contact 9b to disengage from the stationary contact 10, thus quickly tripping the circuit breaker. Due to overtravel, it can be configured such that during the movement of contact 9a towards the opening direction, the microswitch 12 is first triggered by the toggle lever 9d, sending an opening signal to the MCU microcontroller. At this time, the moving contact 9b and the stationary contact 10 are not disconnected. The MCU microcontroller receives the signal indicating the opening position of the microswitch and controls the solid-state switch to open first. Only after the solid-state switch opens will the moving contact 9b and the stationary contact 10 disconnect (lose contact).

[0058] After the coil 8c is de-energized, the moving iron core 8d and the stationary iron core 8f lose their magnetic force. The moving iron core 8d will move downward under the action of the reset spring 8e and drive the push rod 8g to retract back into the housing 8b. At the same time, the lower lock 7 will rotate clockwise to reset under the action of the second torsion spring 5. Meanwhile, the button 11 will move to the left to reset under the push of the push plate 7a.

[0059] 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.

[0060] 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 circuit breaker mechanical switching device comprising a hollow housing as a load bearing base, characterized in that: It also includes a handle, a locking buckle, a first torsion spring, a stationary contact, a contact system, a connecting rod, a button, a lower locking buckle, and a second torsion spring; The housing has a first mounting post, a second mounting post, and a sliding groove inside; the first mounting post is vertically arranged on the left side of the housing, the sliding groove is horizontally arranged on the left side of the first mounting post, and the second mounting post is vertically arranged below the sliding groove. The right end of the handle is rotatably connected to the first mounting post, and the left end extends out of the outer casing to the left. The upper locking buckle is fixed to the right end of the handle and is hook-shaped, with its hook face facing the clockwise rotation direction of the handle; the first torsion spring is sleeved on the first mounting post and has two rotating arms, the left rotating arm of which is locked on the inner wall of the outer shell, while the right rotating arm of which is locked on the upper locking buckle and can push the upper locking buckle to rotate clockwise in an energy storage state. 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 contacts or separates from the stationary contact and causes the circuit breaker to open or close. The two ends of the connecting rod are respectively rotatably connected to the upper locking buckle and the contact system; The lower latch is rotatably connected to the second mounting post and located below the handle and contact system, with its left end in the shape of a hook. The hook face of the lower latch faces upward and can engage with the hook face of the upper latch. A push plate is provided on the rear side of the lower latch, with the left side of the push plate inclined from the lower left to the upper right and the lower end of the push plate extending beyond the lower side of the lower latch. The button is horizontally movable and located below the handle and behind the lower latch. The left end of the button is outside the housing, while its right end is directly opposite the lower left end of the push plate. Pressing the button to the right will push the push plate to rotate and cause the lower latch to rotate counterclockwise and disengage from the upper latch. The second torsion spring is sleeved on the second mounting post and has two rotating arms. The right rotating arm is locked on the inner wall of the housing, while the left rotating arm is locked on the lower latch located on the left side of the second mounting post and can push the lower latch to rotate clockwise in the energy storage state.

2. The circuit breaker mechanical switch device of claim 1, wherein: A limiting surface is provided on the left side of the outer casing to prevent the handle from rotating excessively counterclockwise.

3. The circuit breaker mechanical switch device of claim 1, wherein: The contact system includes a contact support, a moving contact, a contact spring, and a toggle lever; The contact is slidably installed in the slide groove and can move linearly along the slide groove. The bottom of the contact is concave to form a horizontally set mounting groove. The left side of the contact 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 drives the circuit breaker to open or close.

4. The circuit breaker mechanical switching device 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.

5. The circuit breaker mechanical switching device according to claim 1, characterized in that: The upper latch has an inclined surface on the side away from the handle; the lower latch has an inclined surface on the side facing the handle.

6. The circuit breaker mechanical switching device according to claim 1, characterized in that: The left half of the button is cylindrical and the right half is conical. The diameter of the left end of the right half is larger than that of the left half. A guide hole is provided on the outer shell corresponding to the left half of the button to cooperate with the left half of the button. At the same time, a pressing head with a diameter larger than that of the left half of the button is provided at the left end of the button.

7. The circuit breaker mechanical switching device according to any one of claims 1-6, 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 shell and located below the right end of the lower latch. The left end of the housing is open and the opening faces the lower side of the right end of the lower latch. The stationary iron core is a cylinder fixed inside the upper side of the shell and connected to the opening of the shell; The moving iron core is a cylindrical body that is disposed on the lower side inside the housing and can slide inside the housing; The coil is wound around the outside of the housing; 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 up and down in the stationary iron core. The lower end of the push rod is fixed in the moving iron core and can move up and down under the drive of 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 top rod upward to extend out of the housing. This pushes the lower latch upward to rotate counterclockwise, causing the upper latch to disengage from the lower latch, thereby causing the plug-in circuit breaker to trip. 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 downward under the action of the reset spring and drive the push rod to retract back into the housing.

8. The circuit breaker mechanical switching device according to claim 7, characterized in that: The outer casing is also provided with a protective sleeve that encloses the coil and the casing, and the upper end of the protective sleeve has an opening for the top rod to extend upward.

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