Locking catch, contact drive assembly and circuit breaker

Abstract

This utility model provides a locking component, a contact drive assembly, and a circuit breaker. The locking component connects a connecting rod and a contact support within the circuit breaker. In the closed state, the locking component locks the connecting rod to the contact support, causing the moving contact to contact the stationary contact. In the open state, it releases the lock and drives the connecting rod to rotate in the opening direction. The locking component includes a locking body, a tripping part, a locking part, and a linkage hook. The locking body has a rotating shaft. The tripping part and the locking part are integrally formed at both ends of the locking body with the rotating shaft as the center. The linkage hook is connected to the locking body and located on the side of the rotating shaft near the locking part. A hook portion is formed on the linkage hook opposite to the locking part. The hook portion is configured to hook the connecting rod of the circuit breaker during tripping and drive the connecting rod to rotate in the opening direction. A tripping receiving area is formed between the linkage hook and the locking part to accommodate the connecting rod.

Description

Technical Field

[0001] This utility model relates to the field of circuit breakers, and particularly to a locking component, a contact driving assembly, and a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of carrying and interrupting current under abnormal circuit conditions within a specified time. To achieve the separation of moving and stationary contacts, traditional circuit breakers require components such as contact supports, trip latches, latches, levers, and latch springs in addition to handles and connecting rods, resulting in large size and high cost. To address this, Chinese patent CN 105575740A proposes using a drive wheel and trip frame to replace traditional trip latches, latches, levers, and contact supports, thereby simplifying the circuit breaker structure.

[0003] However, in the closed state, the connecting rod of the circuit breaker provided by this patent is locked in the bayonet formed by the trip frame and the drive wheel. Although the lock is released during tripping, the center of the connecting rod is still located below the rotation center of the handle. The reaction force of the first and second return springs is required to push the connecting rod out of the bayonet and change its center position before the drive wheel and moving contact can rotate counterclockwise to open the circuit. This tripping method, which relies solely on the reaction force of the springs, has three major problems: low tripping sensitivity, poor performance consistency, and the return springs are prone to tripping failure after long-term use. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a locking component, a contact driving assembly, and a circuit breaker.

[0005] To achieve the above objectives, the first aspect of this utility model provides a locking member, which connects a connecting rod and a contact support within a circuit breaker. The locking member locks the connecting rod to the contact support in the closed state, causing the moving contact to contact the stationary contact. In the open state, it releases the lock and rotates the connecting rod in the opening direction. The locking member includes a locking body, a tripping part, a locking part, and a linkage hook. The locking body has a rotating shaft. The tripping part and the locking part are integrally formed at both ends of the locking body with the rotating shaft as the center. The linkage hook is connected to the locking body and located on the side of the rotating shaft near the locking part. A hook portion is formed on the linkage hook opposite to the locking part. The hook portion is configured to hook the connecting rod of the circuit breaker during tripping and drive the connecting rod to rotate in the opening direction. A tripping receiving area for accommodating the connecting rod is formed between the linkage hook and the locking part.

[0006] According to an embodiment of the first aspect of the present invention, the distance between the hook portion and the locking portion of the linkage hook is close to the diameter of the connecting rod; in the closed state, the locking portion and the hook portion respectively abut against both sides of the connecting rod.

[0007] According to an embodiment of the first aspect of the present invention, the latch body also has a clearance area that connects to the tripping accommodating area, and the clearance area is configured as a space that allows the connecting rod to rotate in the opening direction when tripped.

[0008] According to an embodiment of the first aspect of the present invention, the end of the linkage hook extends to the location of the locking part to form a hook part, and an open-type release receiving area is formed between the linkage hook and the locking part.

[0009] According to an embodiment of the first aspect of the present invention, the latch body is a hollow annular plate, and the linkage hook is connected to the rotating shaft on the side near the locking part and extends to the center of the annular plate.

[0010] According to one embodiment of the first aspect of the present invention, the linkage hook is a horizontal plate extending laterally along the circuit breaker housing; or, the linkage hook is an inclined hook whose end extends in the direction of the locking part.

[0011] According to an embodiment of the first aspect of the present invention, the latch body further includes a limiting part disposed on the plate and close to the tripping part, and an assembly gap is formed between the limiting part and the plate, the assembly gap being configured to connect the bimetallic tripping rod inside the circuit breaker.

[0012] According to an embodiment of the first aspect of the present invention, on the latch body, the end of the release portion is provided with at least one protrusion for receiving release trigger.

[0013] A second aspect of this invention also provides a contact driving assembly, which includes a contact support, a locking member, and a moving contact. The contact support has a driving groove that mates with a locking portion and is used to accommodate a connecting rod. The locking member is rotatably connected to the contact support via a rotating shaft and a locking spring. The moving contact is connected to the contact support.

[0014] A third aspect of this utility model also provides a circuit breaker, which includes the above-described contact drive assembly.

[0015] In summary, the locking mechanism, contact drive assembly, and circuit breaker provided by this utility model have linkage hooks formed on the locking body opposite to the locking part. During tripping, the locking body rotates in the opening direction, and the locking part releases the locking of the connecting rod. At the same time, the linkage hooks onto the connecting rod, causing the connecting rod to quickly disengage from the engagement step. The force exerted by the handle on the contact support through the connecting rod disappears instantly, and the contact support quickly rotates in the opening direction under the action of the locking spring, thereby achieving rapid disconnection of the moving contact. This disconnection method is not limited by the performance of the locking spring, as long as it can provide tripping reaction force. The products in batches exhibit good tripping consistency.

[0016] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 The diagram shown is a structural schematic of a circuit breaker provided in an embodiment of this utility model.

[0018] Figure 2 As shown Figure 1 Enlarged diagram of point A in the middle.

[0019] Figure 3 As shown Figure 1 A schematic diagram of the central locking fastener.

[0020] Figure 4 As shown Figure 1 A schematic diagram of the structure of the middle contact drive assembly.

[0021] Figure 5 As shown Figure 4 A schematic diagram of its breakdown.

[0022] Figure 6 As shown Figure 4 A schematic diagram of the structure of the middle contact support component.

[0023] Figure 7 As shown Figure 1 A schematic diagram of the circuit breaker in the open state.

[0024] Figure 8 As shown Figure 7 Enlarged diagram of point B in the middle.

[0025] Figure 9 As shown Figure 7 A schematic diagram of the structure of the arc-extinguishing shield. Detailed Implementation

[0026] like Figure 1 As shown, the circuit breaker provided in this embodiment includes a housing 10, a handle 20, and a connecting rod 30, a stationary contact 40, a contact drive assembly 50, and a magnetic tripping mechanism 60 disposed within the housing. The contact drive assembly 50 is located between the connecting rod 30 and the stationary contact 40. When closing, the handle 20 rotates clockwise, driving the contact drive assembly 50 through the connecting rod 30 and locking the connecting rod 30 within the contact drive assembly 50, thereby closing the moving contact 3 and the stationary contact 40. When opening, the magnetic tripping mechanism 60 acts on the contact drive assembly 50, driving it to move counterclockwise, disengaging the connecting rod 30 from the contact drive assembly 50, thereby separating the moving contact 3 from the stationary contact 40. In this application, the closing direction refers to the rotation direction of the handle 20 and the contact drive assembly 50 when the moving contact 3 and the stationary contact 40 are closed. Figure 1 The middle direction is clockwise; while the opening direction refers to the direction opposite to the closing direction. Figure 1 The middle direction is counterclockwise.

[0027] exist Figure 1 In this circuit breaker, the contact drive assembly 50 includes a contact support 1, a locking member 2, and a moving contact 3. The locking member 2 connects the connecting rod 20 and the contact support 1 within the circuit breaker. In the closed state, the locking member 2 locks the connecting rod 30 to the contact support 1, causing the moving contact 3 to contact the stationary contact 40. In the open state, the locking member 2 releases the lock and rotates the connecting rod 30 in the opening direction. The locking member 2 includes a locking body 21, a tripping part 22, a locking part 23, and a linkage hook 24. The locking body 21 has a rotating shaft 26. The tripping part 22 and the locking part 23 are integrally formed at both ends of the locking body 21 with the rotating shaft 26 as the center. The linkage hook 24 is connected to the latch body 21 and located on the side of the rotating shaft 26 near the locking part 23. A hook part 241 is formed on the linkage hook 24 opposite to the locking part 23. The hook part 241 is configured to hook the circuit breaker linkage rod 30 during tripping and drive the linkage rod 30 to rotate in the opening direction. A tripping receiving area 27 for accommodating the linkage rod is formed between the linkage hook 24 and the locking part 23. The contact support 1 has a drive groove 110 that cooperates with the locking part 23 and is used to accommodate the linkage rod 30. The latch 2 is rotatably connected to the contact support 1 via the rotating shaft 26 and the latching spring 25, while the moving contact 3 is connected to the contact support 1.

[0028] In the locking component 2 provided in this embodiment, the linkage hook 24 and the locking part 23 are spatially symmetrically distributed. When the locking component 2 is subjected to a release force, it rotates in the opening direction (i.e., Figure 1 During the counter-clockwise rotation, the locking part 23 releases the mechanical constraint on the connecting rod 30, and the connecting rod 30 on the drive groove 110 is in a free state. At the same time, the linkage hook 24 moves counter-clockwise, hooking the connecting rod 30 and causing the connecting rod 30 to rotate counter-clockwise so that the connecting rod 30 enters the tripping receiving area 27. The center of the connecting rod 30 changes, and the force applied by the handle 20 to the contact support 1 through the connecting rod 30 is removed. Under the action of the locking spring 25, the contact support 1 drives the moving contact 3 to rotate counter-clockwise, thereby realizing the tripping, and the handle 20 also rotates counter-clockwise to reset under the action of the handle torsion spring (not shown in the figure).

[0029] In this embodiment, when the locking element 2 is triggered by tripping, the linkage hook 24 drives the connecting rod 30 to rotate, quickly changing the center of the connecting rod 30 so that it is above the rotation center of the handle 20. The contact support 1 is almost unloaded in the clockwise direction (closing direction), and the locking spring 25 only needs a small reverse restoring force to drive the contact support 1 and the moving contact 3 to rotate counterclockwise (i.e., rotating in the opening direction). The handle 20 is then quickly reset through the changed center of the connecting rod 30. This not only results in extremely high tripping sensitivity but also excellent tripping consistency among different products.

[0030] like Figure 3 and Figure 4As shown, the distance between the hook portion 241 of the linkage hook 24 and the locking portion 23 is close to the diameter of the connecting rod 30; in the closed state, the surface of the hook portion 241 of the linkage hook abuts against the surface of the connecting rod 30 where it extends into the drive groove 110. This arrangement ensures that when the locking member 2 rotates counterclockwise, the hook portion 241 of the linkage hook immediately hooks the connecting rod 30 to release it, thereby further improving the release sensitivity. However, this utility model does not impose any limitations on this. In other embodiments, the distance between the hook portion and the locking portion of the linkage hook may also be slightly larger than the diameter of the connecting rod for easier assembly.

[0031] In this embodiment, when the linkage hook 241 trips, it pulls the connecting rod 30 out of the drive slot 110 and drives it to rotate counterclockwise into the tripping receiving area 27. To avoid interference with the connecting rod 30 during rotation, this embodiment provides a clearance area 28 on the locking part 23 near the handle 20, which communicates with the tripping receiving area 27. The clearance area 28 is configured to allow the connecting rod 30 to rotate in the opening direction during tripping, thereby quickly changing the center position of the connecting rod 30 and achieving rapid tripping of the contact support 1 and the moving contact 3. However, this utility model does not impose any limitations on this.

[0032] like Figure 3 As shown, the end of the linkage hook 24 extends to the location of the locking part 23 to form a hook part 241, and an open-type tripping receiving area 27 is formed between the linkage hook 24 and the locking part 23. In this embodiment, the latch body 21 is a hollow annular plate, and the linkage hook 24 is disposed on the side of the rotating shaft 26 near the locking part 23 and extends towards the center of the annular plate. Specifically, the linkage hook 24 is a horizontal plate extending laterally along the housing 10. However, this utility model does not limit this. Other structures that can hook the connecting rod out of the drive slot when the circuit is opened are all within the protection scope of this utility model. In other embodiments, the linkage hook can also be provided as an inclined hook with its end extending in the direction of the locking part; or, the end of the linkage hook can also be connected to the latch body. In this embodiment, the end of the tripping part 22 has a plurality of protrusions 221 for receiving tripping triggers. However, this utility model does not limit this.

[0033] In this embodiment, the locking member 2 further includes a limiting part 29 disposed on the locking body 21 and close to the tripping part 22. An assembly gap 290 is formed between the limiting part 29 and the locking body 21, and the assembly gap 290 is configured to connect the bimetallic tripping rod 70 inside the circuit breaker. The limiting part 29 restricts the traction of the bimetallic tripping rod 70 in the thickness direction of the circuit breaker, ensuring that the force of the bimetallic tripping rod 70 can be quickly applied to the locking member 2 in the event of overheating tripping, causing the locking member 2 to rotate in the opening direction, thereby greatly improving the sensitivity of overheating tripping.

[0034] In the contact drive assembly 50 provided in this embodiment, both the latching body 21 and the main body (i.e., the support body 11) of the contact support 1 are plate-type structures. The latching body 21 is fastened to the support body 11 and connected to the support body 11 via the latching spring 25 and the rotating shaft 26. This arrangement forms a compact stacked layout in the thickness direction of the circuit breaker. Compared with the structure of the contact support being housed in the latching member in a traditional circuit breaker, the plate-type latching body 21 and support body 11 greatly reduce the space redundancy caused by component installation within the circuit breaker housing 10, providing conditions for the miniaturization design of the circuit breaker. However, this utility model does not limit the specific structure of the latching body and the support body. In other embodiments, the latching body may also be a hollow latching frame with a linkage hook, and the support body may be housed within the latching frame.

[0035] In this embodiment, as Figure 5 and Figure 6 As shown, the contact support 1 also includes a contact blocking part 12, which is located on the side of the support body 11 opposite to the locking body 21. An open contact mounting groove 13 is formed between the support body 11 and the contact blocking part 12. The end of the moving contact 3 extends into the contact mounting groove 13 and is rotatably connected to the support body 11 via the contact spring 4. The contact mounting groove 13 effectively restricts the displacement of the moving contact 3 in the thickness direction of the circuit breaker, ensuring that the moving contact 3 is precisely aligned and tightly pressed with the stationary contact 40, thereby significantly improving the closing stability. In addition, this design effectively prevents the moving contact 3 from displacing in the thickness direction of the circuit breaker due to the restoring force of the locking spring 25, thus solving the problem of poor closing stability that may result from this.

[0036] Figure 7 As shown Figure 1 A schematic diagram of the circuit breaker in the open state; Figure 8 As shown Figure 7 Enlarged schematic diagram at point B. In the open state, the moving contact 3 and the stationary contact 40 are disconnected, the locking element 2 releases the locking of the connecting rod 30, and the connecting rod 30 is accommodated in the release receiving area 27 and the clearance area 28 between the locking part 23 and the linkage hook 24. The center of the connecting rod 30 is located below the rotation center of the handle 20.

[0037] Furthermore, such as Figure 7 and Figure 9As shown, the circuit breaker including the circuit breaker operating mechanism 50 provided in this embodiment also includes an arc-extinguishing cover 80 disposed within the housing 10. The arc-extinguishing cover 80 includes an insulating cover 81 and a plurality of arc-extinguishing grid plates 82 spaced apart within the insulating cover 81, each arc-extinguishing grid plate 82 having an arc-extinguishing opening 820. From the bottom of the arc-extinguishing opening 820 to its opening, the inner wall of the arc-extinguishing opening 820 includes a straight section 821 parallel to the depth direction of the arc-extinguishing opening 820 and a first inclined section 822 and a second inclined section 823 with gradually increasing openings. The second inclined section 823 with the largest opening can increase the arc-extinguishing space, and the arc generated when the moving contact 3 and the stationary contact 40 break can be completely guided into the arc-extinguishing cover 80, improving the reliability of arc extinguishing.

[0038] In summary, the locking mechanism, contact drive assembly, and circuit breaker provided by this utility model have linkage hooks formed on the locking body opposite to the locking part. During tripping, the locking body rotates in the opening direction, and the locking part releases the locking of the connecting rod. At the same time, the linkage hooks onto the connecting rod, causing the connecting rod to quickly disengage from the engagement step. The force exerted by the handle on the contact support through the connecting rod disappears instantly, and the contact support quickly rotates in the opening direction under the action of the locking spring, thereby achieving rapid disconnection of the moving contact. This disconnection method is not limited by the performance of the locking spring, as long as it can provide tripping reaction force. The products in batches exhibit good tripping consistency.

[0039] Although the present invention has been disclosed above by way of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection claimed in the claims.

Claims

1. A catch member, characterized in that A locking mechanism connects the connecting rod and the contact support within the circuit breaker. In the closed state, the connecting rod is locked to the contact support so that the moving contact contacts the stationary contact. In the open state, the locking mechanism releases the lock and rotates the connecting rod in the opening direction. The locking mechanism includes: The locking body has a rotating shaft; The release part and the locking part are integrally formed at both ends of the latch body with the rotation axis as the center; A linkage hook is connected to the locking body and located on the side of the rotating shaft near the locking part. A hook portion is formed on the linkage hook opposite to the locking part. The hook portion is configured to hook the connecting rod of the circuit breaker and drive the connecting rod to rotate in the opening direction when tripped. A tripping accommodating area for accommodating the connecting rod is formed between the linkage hook and the locking part.

2. The catch member of claim 1, wherein The distance between the hook part and the locking part of the linkage hook is close to the diameter of the connecting rod; in the closed state, the locking part and the hook part respectively abut against the two sides of the connecting rod.

3. The catch member of claim 1, wherein The latch body also has a clearance area that connects to the tripping accommodating area. The clearance area is configured to allow the linkage to rotate in the opening direction when tripped.

4. The catch member of claim 1, wherein The end of the linkage hook extends to the location of the locking part to form a hook part, and an open release receiving area is formed between the linkage hook and the locking part.

5. The catch member of claim 1, wherein The latch body is a hollow annular plate, and the linkage hook is connected to the rotating shaft near the locking part and extends towards the center of the annular plate.

6. The catch member of claim 5, wherein The linkage hook is a horizontal plate extending laterally along the circuit breaker housing; or, the linkage hook is an inclined hook whose end extends in the direction of the locking part.

7. The catch member of claim 1, wherein The latch body also includes a limiting part disposed on the plate and close to the tripping part, and an assembly gap is formed between the limiting part and the plate, which is configured to connect the bimetallic tripping rod inside the circuit breaker.

8. The catch member of claim 1, wherein On the latch body, at least one protrusion for receiving a release trigger is provided at the end of the release portion.

9. A contact drive assembly, characterized by include: The contact support has a drive groove that mates with the locking part and is used to accommodate the connecting rod; The locking member according to any one of claims 1 to 8 is rotatably connected to the contact support member via the rotating shaft and the locking spring; The moving contact is connected to the contact support.

10. A circuit breaker characterized by, Includes the contact driving assembly as described in claim 9.

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