Auxiliary self-locking structure and circuit breaker

Abstract

And the auxiliary self-locking structure comprises a movably arranged locking piece and an auxiliary change-over switch, the cantilever can be switched between a switching-on position and a switching-off position along with rotation of the main shaft, the auxiliary change-over switch comprises a microswitch and a rotatably arranged lever, the cantilever is in driving fit with the lever and is in linkage fit with the locking piece, and the cantilever is provided with a critical position close to the switching-on position. The circuit breaker comprises the auxiliary self-locking structure. According to the auxiliary self-locking structure and the circuit breaker, the locking piece is arranged, the lever is driven by the cantilever to trigger the microswitch to switch the auxiliary change-over switch signal, and the locking piece is unlocked with the lever under linkage of the cantilever to enable the lever to reset so as to reset the auxiliary change-over switch signal. When the cantilever is located between the opening position and the critical position close to the closing position, the locking piece locks the lever in the state of triggering the microswitch, and even if the cantilever rotates towards the closing position due to the springback of the contact, due to the locking effect of the locking piece on the lever, the signal of the auxiliary change-over switch cannot be reset.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to an auxiliary self-locking structure and a circuit breaker. Background Technology

[0002] Currently, the auxiliary changeover switch used in frame circuit breakers needs to be linked with the main shaft of the operating mechanism to ensure that the status of the auxiliary changeover switch matches the open / closed status of the circuit breaker, thus guaranteeing accurate indication of the switch status. However, because the opening and closing angle range of the main shaft of the frame circuit breaker's operating mechanism is much larger than the rotation angle required for the auxiliary changeover switch to achieve state transition, factors such as shaft springback can cause the auxiliary changeover switch to fail to properly indicate the open position of the circuit breaker, leading to incorrect indications. Furthermore, there are also issues such as high requirements for the dimensional fit between components, a small adjustable range, and a large space occupation. Summary of the Invention

[0003] The purpose of this invention is to overcome at least one defect of the prior art and to provide an auxiliary self-locking structure and a circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The auxiliary self-locking structure includes a locking element with a moving mechanism and an auxiliary changeover switch. The cantilever is mounted on the main shaft for driving the moving contact and can switch between the closed and open positions as the main shaft rotates. The auxiliary changeover switch includes a micro switch and a lever with a rotating mechanism. The cantilever is driven by the lever and is linked with the locking element. The cantilever has a critical position between the closed and open positions and close to the closed position.

[0006] During the switching process of the cantilever from the closed position to the open position, the cantilever drives the lever to rotate, causing the lever to trigger the micro switch to switch to the first switch state; when the cantilever is in the open position, it separates from the locking element, and the locking element locks with the lever; during the switching process of the cantilever from the open position to the critical position, the locking element remains locked with the lever; when the cantilever is in the critical position, it drives the locking element to release the locking element from the lever.

[0007] Optionally, it also includes a reset elastic element for resetting the locking element; during the switching process of the cantilever from the open position to the closed position, the cantilever drives the locking element to store energy in the reset elastic element; when the cantilever is in the open position, it separates from the locking element, so that the reset elastic element releases energy to drive the locking element to lock the lever.

[0008] Optionally, the lever is provided with a latch for cooperating with the cantilever and the locking member. The locking member is provided with a locking surface for locking with the latch and a linkage surface for linkage with the cantilever. During the switching process of the cantilever from the open position to the critical position, the cantilever acts on the linkage surface of the locking member to make the locking surface slide on the latch. When the cantilever is in the critical position, it continues to drive the locking member to separate the locking surface from the latch.

[0009] Optionally, the axis of the cantilever is parallel to the axis of the lever, and the cantilever and the locking member are stacked and spaced apart in the direction parallel to the axis of the cantilever. The locking member is located on one side of the line connecting the axis of the cantilever and the axis of the lever.

[0010] Optionally, the locking member extends in the direction of the line connecting the axis of the cantilever and the axis of the lever to form a locking part, and the side of the locking part near the line connecting the axis of the cantilever and the axis of the lever is the locking surface.

[0011] Optionally, the locking member extends in a direction parallel to the axis of the cantilever to form a linkage part, the side of the linkage part facing the cantilever is the linkage surface, and the cantilever is located between the linkage part and the latch part in a direction perpendicular to the axis of the cantilever.

[0012] Optionally, the locking part has an unlocking surface connected to the locking surface, and the latch part is opposite to the unlocking surface after being separated from the locking surface. In the direction of movement of the locking member during the switching of the cantilever from the closed position to the open position, the linkage surface, the locking surface, and the unlocking surface are arranged in sequence.

[0013] Optionally, the auxiliary changeover switch further includes a bracket, the bracket having an installation space, the lever and the micro switch being installed within the installation space, the lever having a latch extending out of the installation space, and the locking member being installed on the outside of the bracket opposite to the latch.

[0014] Optionally, one end of the lever is provided with a latch for engaging with the cantilever and locking member, the middle part of the lever is provided with a lever shaft for lever rotation, and the other end of the lever is provided with a trigger for engaging with a micro switch.

[0015] Optionally, the cantilever is engaged with a lever drive via a locking member, the locking member having a driven surface for engaging with the cantilever drive and a guide surface for engaging with the latch part in linkage.

[0016] During the switching process of the cantilever from the closed position to the open position, the cantilever acts on the driven surface to drive the locking element, while the guide surface abuts against the latch to drive the lever to rotate, causing the lever to trigger the micro switch to switch to the first switch state; when the cantilever is in the open position, it drives the locking element to separate the guide surface from the latch, and the locking surface locks into the latch.

[0017] Optionally, the locking element is configured to move linearly.

[0018] Optionally, the locking member is a straight structure arranged along the moving direction of the locking member. A protruding locking part is provided on one edge of the locking member. The end face of the locking part is a locking surface for locking with a lever. The locking surface is parallel to the moving direction of the locking member. A linkage part is provided on the side of the locking member facing the cantilever, which is protruding in a direction perpendicular to the moving direction of the locking member and located on one side of the cantilever. The side of the linkage part facing the cantilever is a linkage surface for linkage with the cantilever.

[0019] Optionally, the locking element is rotatably configured.

[0020] Optionally, the locking element is a fan-shaped structure centered on the axis of the locking element, having an arc-shaped edge and two straight edges. The connection between the two straight edges extends outward to form a locking part. The end face of the locking part is a locking surface for engaging with a lever. The locking surface is an arc surface concentric with the axis of the locking element. One of the straight edges of the fan-shaped structure extends outward at the connection with the arc-shaped edge to form an extension. The extension has a linkage part on the side facing the cantilever, which protrudes along the direction parallel to the axis of the locking element and is located on one side of the cantilever. The side of the linkage part facing the cantilever is a linkage surface for engaging with the cantilever.

[0021] Optionally, when the cantilever is in the closed position, the cantilever separates from the lever and causes the locking element to unlock from the lever, and the micro switch switches to the second switch state.

[0022] The circuit breaker includes any of the auxiliary self-locking structures described in the above technical solutions.

[0023] The auxiliary self-locking structure and circuit breaker of the present invention are equipped with a locking element. The lever triggers a micro switch to switch the auxiliary changeover switch signal under the drive of the cantilever. The locking element unlocks the lever under the linkage of the cantilever, so that the lever is reset and the auxiliary changeover switch signal is reset. When the cantilever is between the open position and the critical position near the close position, the locking element locks the lever in the state of triggering the micro switch. Even if the cantilever rotates to the close position due to the rebound of the contacts, the auxiliary changeover switch signal will not be reset due to the locking effect of the locking element on the lever, so as to normally indicate the open state of the circuit breaker, and the cooperation is reliable and stable.

[0024] In addition, the reset elastic element allows the locking element to automatically lock the lever of the auxiliary changeover switch under the action of the reset elastic element after the cantilever releases its restriction on the locking element. Attached Figure Description

[0025] Figure 1 This is a partial structural diagram of the circuit breaker in the closed state according to Embodiment 1 of the present invention;

[0026] Figure 2 This is a partial structural diagram of the circuit breaker in the open state according to Embodiment 1 of the present invention;

[0027] Figure 3 This is a partial structural diagram of the circuit breaker when the cantilever begins to unlock the locking member and lever according to Embodiment 1 of the present invention;

[0028] Figure 4 This is a perspective view of the auxiliary self-locking structure according to Embodiment 1 of the present invention;

[0029] Figure 5 This is a view of the auxiliary self-locking structure according to Embodiment 1 of the present invention;

[0030] Figure 6 This is a perspective view of the auxiliary self-locking structure of Embodiment 2 of the present invention;

[0031] Figure 7 This is a partial structural diagram of the circuit breaker in the closed state according to Embodiment 2 of the present invention;

[0032] Figure 8 This is a partial structural diagram of the circuit breaker in the open state according to Embodiment 2 of the present invention;

[0033] Figure 9 This is a partial structural diagram of the circuit breaker when the cantilever begins to unlock the locking member and lever in Embodiment 2 of the present invention;

[0034] Figure 10 This is a partial structural diagram of the circuit breaker in the closed state, which is an alternative to the locking element reset structure in Embodiment 1 of the present invention.

[0035] Figure 11 This is a partial structural diagram of the circuit breaker when the cantilever starts to drive the locking member to lock with the lever in an alternative solution to the locking member reset structure of Embodiment 1 of the present invention;

[0036] Figure 12 This is a partial structural diagram of the circuit breaker in the open state, which is an alternative to the locking element reset structure in Embodiment 1 of the present invention.

[0037] 1-Locking component; 101-Locking part; 101a-Locking surface; 101b-Unlocking surface; 101c-Guide surface; 102-Linkage part; 102a-Linkage surface; 103-Locking component pivot; 104-Sliding hole; 105-Connecting hole; 106-Actuated part; 106a-Actuated surface; 2-Auxiliary changeover switch; 201-Micro switch; 201a-Pressure plate; 201b-Button; 202-Lever; 202a-Snap fastener; 202b-Trigger part; 202c-Lever pivot; 203-Mounting side plate; 203a-Mounting shaft; 203b-Fixing shaft; 3-Reset elastic component; 4-Operating mechanism; 401-Cantilever; 401a-Driving surface; 401b-Actuating surface; 401c-Pushing surface; 402-Cantilever pivot; 5-Base. Detailed Implementation

[0038] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the auxiliary self-locking structure and circuit breaker of the present invention. The auxiliary self-locking structure and circuit breaker of the present invention are not limited to the descriptions in the following embodiments.

[0039] like Figure 1 As shown, the circuit breaker in this embodiment includes a base 5, an operating mechanism 4 mounted on the base 5, a contact system, and an auxiliary self-locking structure. The operating mechanism 4 includes a main shaft and a cantilever 401 connected in a linkage manner. The contact system includes a cooperating moving contact and a stationary contact. The main shaft is rotatably mounted and connected to the moving contact, used to drive the moving contact to open or close with the stationary contact to realize the opening and closing of the circuit breaker. It should be noted that the structure and operating principle of the operating mechanism 4 are existing technologies and will not be described in detail here.

[0040] like Figures 1-5 or Figures 6-9As shown, the auxiliary self-locking structure of this embodiment includes a movable locking member 1 and an auxiliary changeover switch 2. A cantilever 401 is mounted on the main shaft and can switch between a closed position and an open position as the main shaft rotates. The auxiliary changeover switch 2 includes a micro switch 201 and a rotatable lever 202. The cantilever 401 is driven to cooperate with the lever 202 and is linked to the locking member 1. The cantilever 401 has a critical position between the closed and open positions, close to the closed position. During the switching process from the closed to the open position, the cantilever 401 drives the lever 202 to rotate, causing the lever 202 to trigger the micro switch 201 to switch to the first switch state. When the cantilever 401 is in the open position, it separates from the locking member 1, and the locking member 1 locks into the lever 202. During the switching process of cantilever 401 from the open position to the closed position, cantilever 401 disengages from lever 202, causing locking element 1 to unlock from lever 202. This resets lever 202 and microswitch 201, switching it to the second switching state. Specifically, when cantilever 401 is in the closed position, cantilever 401 separates from lever 202, causing locking element 1 to unlock from lever 202, and microswitch 201 switches to the second switching state. In particular, during the switching process of cantilever 401 from the open position to the critical position, locking element 1 remains locked to lever 202; when cantilever 401 is in the critical position, locking element 1 is unlocked from lever 202, reliably indicating the open status of the circuit breaker.

[0041] Specifically, during the switching process of cantilever 401 from the open position to the critical position, cantilever 401 separates from lever 202, but locking member 1 remains locked to lever 202. If the separation is caused by contact rebound, as long as the contact rebound does not exceed the critical position, auxiliary changeover switch 2 will stably output the open status signal. If it is a normal closing operation, cantilever 401 rotates with the main shaft from the open position to the closing position. When cantilever 401 is at the critical position, it drives locking member 1 to release locking member 1 from lever 202, causing lever 202 to reset and micro switch 201 to reset and switch to the second switch state. After that, cantilever 401 rotates with the main shaft to the closing position.

[0042] The auxiliary self-locking structure and circuit breaker of this embodiment are provided with a locking member 1. The lever 202 triggers the micro switch 201 to switch the signal of the auxiliary changeover switch 2 under the drive of the cantilever 401. The locking member 1 unlocks the lever 202 under the linkage of the cantilever 401, so that the lever 202 is reset to realize the reset of the signal of the auxiliary changeover switch 2. When the cantilever 401 is between the open position and the critical position near the close position, the locking member 1 locks the lever 202 in the state of triggering the micro switch 201. Even if the cantilever 401 rotates to the close position due to the rebound of the contacts, the signal of the auxiliary changeover switch 2 will not be reset due to the locking effect of the locking member 1 on the lever 202, so as to normally indicate the open position of the circuit breaker, and the cooperation is reliable and stable.

[0043] It should be noted that the critical position near the closing position refers to a distance from the critical position to the closing position being less than the distance from the critical position to the opening position. The first switching state of the triggering microswitch 201 can be either the microswitch being closed to output a signal or the microswitch being open to output a signal. The corresponding second switching state is a different switching device from the first switching state, which can be either the microswitch being open to output a signal or the microswitch being closed to output a signal. The microswitch can be a normally open microswitch or a normally closed microswitch, or a microswitch including multiple sets of normally open contacts and / or normally closed contacts, as needed. The microswitch 201 is existing technology and typically includes a pressure plate 201a and a button 201b. The microswitch 201 has a built-in reset structure, allowing the button 201b to automatically reset when released. In this embodiment, when button 201b is pressed by lever 202, the signal of micro switch 201 is switched, and auxiliary switch 2 outputs a tripping state signal; when button 201b is released by lever 202, button 201b automatically resets and enters the pop-out state, and auxiliary switch 2 outputs a closing state signal. It is worth noting that in this embodiment, micro switch 201 includes a pressure plate 201a structure to increase the rotational stroke of lever 202; alternatively, a micro switch 201 without a pressure plate 201a structure can be selected. After the locking member 1 releases the lock on lever 202, the reset of lever 202 can be driven by the reset of button 201b, or by gravity. A lever reset spring can also be provided to drive lever 202 to reset.

[0044] Furthermore, in one embodiment of the reset structure of the locking element 1, the auxiliary self-locking structure of this embodiment also includes a reset elastic element 3 for resetting the locking element 1; during the switching process of the cantilever 401 from the open position to the closed position, the cantilever 401 drives the locking element 1 to store energy in the reset elastic element 3; when the cantilever 401 is in the open position, it separates from the locking element 1, causing the reset elastic element 3 to release energy to drive the locking element 1 to lock the lever 202. The setting of the reset elastic element 3 allows the locking element 1 to automatically lock the lever 202 of the auxiliary changeover switch 2 under the action of the reset elastic element 3 after the cantilever 401 releases its constraint on the locking element 1.

[0045] like Figures 1-5 Example 1 or Figures 6-9The second embodiment shows the cooperation structure between the cantilever 401, the locking member 1, and the lever 202. The lever 202 is provided with a latch portion 202a for cooperating with the cantilever 401 and the locking member 1. The locking member 1 is provided with a locking surface 101a for locking with the latch portion 202a and a linkage surface 102a for linkage with the cantilever 401. During the process of the cantilever 401 switching from the open position to the critical position, the cantilever 401 acts on the linkage surface 102a of the locking member 1, causing the locking surface 101a to slide on the latch portion 202a. When the cantilever 401 is in the critical position, it continues to drive the locking member 1 to separate the locking surface 101a from the latch portion 202a, thereby unlocking the locking member 1 from the lever 202.

[0046] Specifically, the axis of the cantilever 401 (the center line of the cantilever shaft 402 of the main shaft) is parallel to the axis of the lever 202. The cantilever 401 and the locking member 1 are stacked and spaced apart in the direction parallel to the axis of the cantilever 401. The locking member 1 is located on one side of the line connecting the axis of the cantilever 401 and the axis of the lever 202. The locking member 1 extends in the direction close to the line connecting the axis of the cantilever 401 and the axis of the lever 202 to form a locking part 101. The side of the locking part 101 close to the line connecting the axis of the cantilever 401 and the axis of the lever 202 is the locking surface 101a. The locking member 1 extends parallel to the axis of the cantilever 401 to form a linkage part 102. The side of the linkage part 102 facing the cantilever 401 is the linkage surface 102a. In the direction perpendicular to the axis of the cantilever 401, the cantilever 401 is located between the linkage part 102 and the latching part 202a. One side of the cantilever 401 is provided with a driving surface 401a for linkage engagement with the latching part 202a, and the other side of the cantilever 401 is provided with an action surface 401b for linkage engagement with the linkage surface 102a. Preferably, the driving surface 401a is an arc-shaped convex surface.

[0047] Furthermore, the locking part 101 has an unlocking surface 101b connected to the locking surface 101a. After the latching part 202a separates from the locking surface 101a, it faces the unlocking surface 101b. During the switching process of the cantilever 401 from the closed position to the open position, the linkage surface 102a, the locking surface 101a, and the unlocking surface 101b are arranged sequentially in the direction of movement of the locking member 1. The relative position of the linkage surface 102a and the locking surface 101a can be adjusted as needed to achieve the angle that the cantilever 401 needs to rotate to switch the auxiliary changeover switch 2 from an open signal to a closed signal.

[0048] like Figures 4-5 or Figure 6As shown, the auxiliary changeover switch 2 in this embodiment also includes a bracket. The bracket has an installation space, and the lever 202 and the micro switch 201 are installed within the installation space. The lever 202 has a latching portion 202a extending out of the installation space, and the locking member 1 is installed on the outside of the bracket and opposite to the latching portion 202a. Specifically, the bracket includes two mounting side plates 203, which are spaced apart to form the installation space. The locking member 1 has an external design, which occupies little space and will not interfere with other internal components. Of course, as another embodiment, the locking member 1 can also be located inside the bracket of the auxiliary changeover switch 2.

[0049] like Figures 4-5 or Figure 6 As shown, in this embodiment, the lever 202 has the following structure: one end of the lever 202 is provided with the latch portion 202a, and the middle part of the lever 202 is provided with a lever shaft 202c for rotating the lever 202. The lever shaft 202c is rotatably mounted between two mounting side plates 203, and the axis of the lever 202 refers to the center line of the lever shaft 202c. The other end of the lever 202 is provided with a trigger portion 202b for triggering the micro switch 201. The trigger portion 202b for triggering the micro switch 201 and the latch portion 202a for cooperating with the locking member 1 and the cantilever 401 are located on both sides of the axis of the lever 202, which facilitates the orderly arrangement of the micro switch 201, the locking member 1, and the cantilever 401.

[0050] Alternative solutions to the reset structure of locking component 1 include, for example: Figures 10-12 As shown, in this embodiment, the reset elastic element 3 is not provided. The cantilever 401 is driven to engage with the lever 202 via the locking element 1. The locking element 1 has a driven surface 106a for driving engagement with the cantilever 401 and a guide surface 101c for linkage engagement with the latch part 202a. The cantilever 401 has a pushing surface 401c for driving engagement with the driven surface 106a. The pushing surface 401c is connected between the driving surface 401a and the acting surface 401b. Figure 11 As shown, during the switching process of the cantilever 401 from the closed position to the open position, the pushing surface 401c of the cantilever 401 acts on the driven surface 106a to drive the locking member 1 to translate in the direction of the arrow. At the same time, the guide surface 101c abuts against the latch part 202a to drive the lever 202 to rotate, so that the lever 202 triggers the micro switch 201 to switch to the first switch state; as Figure 12 As shown, when the cantilever 401 is in the open position, it drives the locking member 1, causing the guide surface 101c to separate from the latch part 202a, and the locking surface 101a and the latch part 202a lock together.

[0051] like Figures 1-5As shown in the first embodiment of the movement mode of the locking member 1, the locking member 1 is arranged to move linearly, and the direction of movement of the locking member 1 is perpendicular to the axis of the cantilever 401. In this embodiment, the locking member 1 is a straight structure arranged along the direction of movement of the locking member 1. A protruding locking part 101 is provided on one edge of the locking member 1. The end face of the locking part 101 is a locking surface 101a for locking and engaging with the lever 202. The locking surface 101a is parallel to the direction of movement of the locking member 1. A linkage part 102 is provided on the side of the locking member 1 facing the cantilever 401, protruding in a direction perpendicular to the direction of movement of the locking member 1 and located on one side of the cantilever 401. The side of the linkage part 102 facing the cantilever 401 is a linkage surface 102a for linkage and engaging with the cantilever 401. The side of the locking part 101 facing away from the linkage part 102 is an unlocking surface 101b. Specifically, a mounting shaft 203a is provided on the outer side of the mounting side plate 203 of the bracket, and the locking member 1 is provided with a sliding hole 104 that slides with the mounting shaft 203a. The sliding hole 104 is preferably an oblong hole, and the mounting shaft 203a is slidably inserted into the sliding hole 104 to realize the linear movement of the locking member 1. In this embodiment, as Figure 5 As shown, the reset structure of the locking member 1 adopts a reset elastic member 3. One end of the reset elastic member 3 is hung in the connecting hole 105 of the locking member 1, and the other end of the reset elastic member 3 is hung on the mounting shaft 203a. In this embodiment, as... Figures 10-12 As shown, the reset structure of the locking member 1 adopts an alternative solution that does not include the reset elastic member 3. The unlocking surface 101b of the locking part 101 has a guide surface 101c at one end connected to the locking surface 101a. The angle between the guide surface 101c and the locking surface 101a is an obtuse angle. The other end of the unlocking surface 101b of the locking part 101 extends perpendicular to the moving direction of the locking member 1 to form a driven part 106. The side of the driven part 106 facing the linkage part 102 is the driven surface 106a. For example... Figure 11 As shown, during the switching process of the cantilever 401 from the closed position to the open position, the guide surface 101c cooperates with the arc surface at the end of the latch part 202a, causing the lever 202 to rotate counterclockwise, so that the lever 202 triggers the micro switch 201 to switch to the first switch state.

[0052] The operating principle of the auxiliary self-locking structure in this embodiment is illustrated by taking the reset elastic element 3 as an example, where the reset structure of the locking element 1 is based on the reset elastic element 3. Figure 1 The diagram shows the circuit breaker in the closed state. At this time, the cantilever 401 is in the closed position. The action surface 401b of the cantilever 401 limits the linkage part 102 of the locking member 1, causing the locking part 101 to disengage from the latch part 202a. As a result, the lever 202 is in a free state, the button 201b is in the pop-out state, and the auxiliary changeover switch 2 outputs a closed state signal, that is, the micro switch 201 switches to the second switch state.

[0053] like Figure 2 The diagram shows the circuit breaker in the open position. At this time, the cantilever 401 rotates clockwise from the closed position to the open position and pushes the latch 202a to drive the lever 202 to rotate counterclockwise in the direction of the arrow in the diagram. This causes the trigger 202b to push the pressure plate 201a, which in turn presses the button 201b. At this time, the micro switch 201 performs a signal conversion, and the auxiliary changeover switch 2 outputs an open position signal, that is, the micro switch 201 switches to the first switch state. Since the cantilever 401 loses its limiting effect on the linkage 102 after rotating to the open position, the locking member 1 slides upward under the action of the reset elastic member 3, causing the locking member 101 to slide to the side of the latch 202a. The locking surface 101a locks and limits the latch 202a.

[0054] When the cantilever 401 rotates slightly towards the closed position due to the rebound of the contacts, that is, during the process of the cantilever 401 switching from the open position to the critical position, such as Figure 3 As shown, due to the locking and limiting effect of the locking surface 101a on the latch part 202a, the micro switch 201 is stably in the state where the button 201b is pressed, and the auxiliary changeover switch 2 always outputs the open state signal. As long as the contact rebound does not exceed the critical position, the auxiliary changeover switch 2 will stably output the open state signal.

[0055] When the main shaft drives the moving contact to perform a normal closing operation, the cantilever 401 rotates with the main shaft from the open position to the closed position. During the counterclockwise rotation of the cantilever 401 from the open position to the closed position, when the cantilever 401 rotates to a certain angle and approaches the closed position, the cantilever 401 will push the linkage 102, thereby causing the locking element 1 to move downwards. When the cantilever 401 rotates counterclockwise to... Figure 3 At the critical position shown, the cantilever 401 disengages the locking surface 101a from the latch 202a, thereby releasing the lever 202. The lever 202 rotates clockwise to reset, the button 201b pops out, the signal of the micro switch 201 changes, and the auxiliary changeover switch 2 outputs a closing status signal, that is, the micro switch 201 switches to the second switch state. The cantilever 401 rotates with the main shaft to the closing position, and the circuit breaker enters the following state: Figure 1 The stable closing state is shown. In this embodiment, by adjusting the distance D between the unlocking surface 101b and the linkage surface 102a of the locking member 1, the angle that the cantilever 401 needs to rotate to convert the auxiliary changeover switch 2 from a closing signal to a closing signal can be adjusted.

[0056] like Figures 6-9As shown in the second embodiment of the movement mode of the locking member 1, the locking member 1 is rotatably configured, and the axis of the locking member 1 is parallel to the axis of the cantilever 401. In this embodiment, the locking member 1 is a fan-shaped structure centered on the axis of the locking member 1, having an arc-shaped edge and two straight edges. The connection of the two straight edges extends outward to form a locking part 101. The end face of the locking part 101 is a locking surface 101a for locking and engaging with the lever 202. The locking surface 101a is an arc surface concentric with the axis of the locking member 1. One of the straight edges of the fan-shaped structure extends outward at the connection with the arc-shaped edge to form an extension. The extension has a linkage part 102 on the side facing the cantilever 401, which protrudes along the direction parallel to the axis of the locking member 1 and is located on one side of the cantilever 401. The side of the linkage part 102 facing the cantilever 401 is a linkage surface 102a for linkage and engaging with the cantilever 401. The side of the locking part 101 facing away from the linkage part 102 is the unlocking surface 101b. Specifically, the locking member 1 is provided with a locking member pivot 103, which is rotatably inserted into the rotation mounting hole on the mounting side plate 203 of the bracket to achieve the rotatable setting of the locking member 1. In this embodiment, one end of the reset elastic member 3 is hung in the connecting hole 105 of the locking member 1, and the other end of the reset elastic member 3 is hung on the fixed shaft 203b on the outside of the mounting side plate 203. In this embodiment, the reset structure of the locking member 1 adopts the reset elastic member 3, but an alternative solution without the reset elastic member 3 can also be used.

[0057] The operating principle of the auxiliary self-locking structure in this embodiment is as follows: Figure 7 The diagram shows the circuit breaker in the closed state. At this time, the cantilever 401 is in the closed position. The action surface 401b of the cantilever 401 limits the linkage part 102 of the locking member 1, causing the locking part 101 to disengage from the latch part 202a. As a result, the lever 202 is in a free state, the button 201b is in the pop-out state, and the auxiliary changeover switch 2 outputs a closed state signal, that is, the micro switch 201 switches to the second switch state.

[0058] like Figure 8The diagram shows the circuit breaker in the open position. At this time, the cantilever 401 rotates clockwise from the closed position to the open position and pushes the latch 202a to drive the lever 202 to rotate counterclockwise in the direction of the arrow in the figure. This causes the trigger 202b to push the pressure plate 201a, which in turn presses the button 201b. At this time, the micro switch 201 performs a signal conversion, and the auxiliary changeover switch 2 outputs an open position signal, that is, the micro switch 201 switches to the first switch state. Since the cantilever 401 loses its limiting effect on the linkage 102 after rotating to the open position, the locking member 1 rotates counterclockwise in the direction of the arrow in the figure under the action of the reset elastic member 3, causing the locking member 101 to slide to the side of the latch 202a. The locking surface 101a locks and limits the latch 202a. Since the locking surface 101a is an arc surface concentric with the locking member shaft 103, the thrust of the latch part 202a on the locking surface 101a is perpendicular to the locking member shaft 103, so that the lever 202 cannot drive the locking member 1 to rotate, thereby realizing the locking and limiting function of the locking member 1 on the lever 202.

[0059] When the cantilever 401 rotates slightly towards the closed position due to the rebound of the contacts, that is, during the process of the cantilever 401 switching from the open position to the critical position, such as Figure 9 As shown, since the locking surface 101a has not disengaged from the latch part 202a, the locking limit function still exists, so that the micro switch 201 is stably in the state where the button 201b is pressed. The auxiliary changeover switch 2 always outputs the open state signal. As long as the contact rebound does not exceed the critical position, the auxiliary changeover switch 2 will stably output the open state signal.

[0060] When the main shaft drives the moving contact to perform a normal closing operation, the cantilever 401 rotates with the main shaft from the open position to the closed position. During the process of the cantilever 401 rotating counterclockwise from the open position to the closed position, when the cantilever 401 rotates to a certain angle and approaches the closed position, the cantilever 401 will push the linkage 102, thereby causing the locking element 1 to rotate clockwise. When the cantilever 401 rotates counterclockwise to... Figure 3 When the critical position is shown, the locking surface 101a disengages from the latch 202a, thereby releasing the lever 202. The lever 202 rotates clockwise to reset, the button 201b pops out, the signal of the micro switch 201 changes, the auxiliary changeover switch 2 outputs a closing status signal, and the circuit breaker enters the state as shown. Figure 7 The stable closing state is shown. In this embodiment, by adjusting the angle Φ between the unlocking surface 101b and the linkage surface 102a of the locking member 1, the angle that the cantilever 401 needs to rotate to convert the auxiliary changeover switch 2 from an opening signal to a closing signal can be adjusted.

[0061] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0062] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An auxiliary self-locking structure, comprising a locking element (1) with a movable setting, an auxiliary changeover switch (2), a cantilever (401) mounted on a main shaft for driving a moving contact, capable of switching between a closed position and a closed position as the main shaft rotates, the auxiliary changeover switch (2) comprising a micro switch (201) and a lever (202) with a rotating setting, characterized in that: The cantilever (401) is driven and engaged with the lever (202) and linked with the locking element (1). The cantilever (401) has a critical position between the closed position and the open position and close to the closed position. During the switching process of the cantilever (401) from the closed position to the open position, the cantilever (401) drives the lever (202) to rotate, causing the lever (202) to trigger the micro switch (201) to switch to the first switch state; when the cantilever (401) is in the open position, it separates from the locking member (1), and the locking member (1) is locked with the lever (202); during the switching process of the cantilever (401) from the open position to the critical position, the locking member (1) remains locked with the lever (202); when the cantilever (401) is in the critical position, it drives the locking member (1) to release the locking member (1) from the lever (202).

2. The auxiliary self-locking structure according to claim 1, characterized in that: It also includes a reset elastic element (3) for resetting the locking element (1); during the switching process of the cantilever (401) from the open position to the closed position, the cantilever (401) drives the locking element (1) to store energy in the reset elastic element (3); when the cantilever (401) is in the open position, it separates from the locking element (1) and releases the energy in the reset elastic element (3) to drive the locking element (1) to lock the lever (202).

3. The auxiliary self-locking structure according to claim 1, characterized in that: The lever (202) is provided with a latch (202a) for cooperating with the cantilever (401) and the locking member (1). The locking member (1) is provided with a locking surface (101a) for locking with the latch (202a) and a linkage surface (102a) for linkage with the cantilever (401). During the process of the cantilever (401) switching from the open position to the critical position, the cantilever (401) acts on the linkage surface (102a) of the locking member (1) to make the locking surface (101a) slide on the latch (202a). When the cantilever (401) is in the critical position, it continues to drive the locking member (1) to separate the locking surface (101a) from the latch (202a).

4. The auxiliary self-locking structure according to claim 3, characterized in that: The axis of the cantilever (401) is parallel to the axis of the lever (202). The cantilever (401) and the locking member (1) are stacked and spaced apart in the direction parallel to the axis of the cantilever (401). The locking member (1) is located on one side of the line connecting the axis of the cantilever (401) and the axis of the lever (202).

5. The auxiliary self-locking structure according to claim 4, characterized in that: The locking member (1) extends toward the line connecting the axis of the cantilever (401) and the axis of the lever (202) to form a locking part (101), and the side of the locking part (101) near the line connecting the axis of the cantilever (401) and the axis of the lever (202) is the locking surface (101a).

6. The auxiliary self-locking structure according to claim 4, characterized in that: The locking member (1) extends in a direction parallel to the axis of the cantilever (401) to form a linkage part (102). The side of the linkage part (102) facing the cantilever (401) is the linkage surface (102a). In the direction perpendicular to the axis of the cantilever (401), the cantilever (401) is located between the linkage part (102) and the buckle part (202a).

7. The auxiliary self-locking structure according to claim 5, characterized in that: The locking part (101) has an unlocking surface (101b) connected to the locking surface (101a). After the latch part (202a) is separated from the locking surface (101a), it is opposite to the unlocking surface (101b). In the direction of movement of the locking member (1) during the switching of the cantilever (401) from the closed position to the open position, the linkage surface (102a), the locking surface (101a), and the unlocking surface (101b) are arranged in sequence.

8. The auxiliary self-locking structure according to claim 1, characterized in that: The auxiliary changeover switch (2) also includes a bracket, which has an installation space. The lever (202) and the micro switch (201) are installed in the installation space. The lever (202) has a latch (202a) that extends out of the installation space. The locking member (1) is installed on the outside of the bracket and is opposite to the latch (202a).

9. The auxiliary self-locking structure according to claim 1, characterized in that: One end of the lever (202) is provided with a latch (202a) for cooperating with the cantilever (401) and the locking member (1), the middle part of the lever (202) is provided with a lever pivot (202c) for rotating the lever (202), and the other end of the lever (202) is provided with a trigger part (202b) for cooperating with the micro switch (201).

10. A circuit breaker, characterized in that: Includes the auxiliary self-locking structure as described in any one of claims 1-15.

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