Reverse limiting structure of circuit breaker main shaft and circuit breaker
By setting an anti-reversal component in the circuit breaker to prevent the main shaft from reversing, the problem of reduced opening distance caused by the cantilever hitting the limit shaft is solved, and the electrical insulation performance and reliability of the circuit breaker are improved.
Patent Information
- Application Number
- CN202422617695.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-29
AI Technical Summary
During the opening process of the existing frame circuit breaker, the cantilever of the main shaft assembly hits the limit shaft at high speed, causing reverse rotation, resulting in a reduction in the opening distance between the moving contact assembly and the static contact assembly, affecting the electrical insulation performance and breaking effect.
An anti-reversal component is set between the circuit breaker mechanism body and the cantilever, including a trigger and a limiter. The limiter cooperates with the limiter shaft to prevent the main shaft from reversing. The elastic reset part ensures that the limiter is reset, maintains the opening state, and improves the opening distance.
Effectively maintain the circuit breaker's tripping state, improve electrical insulation performance, and enhance the circuit breaker's reliability and tripping effect.
Smart Images
Figure CN223390471U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to a reverse limiting structure of a main shaft of a circuit breaker and a circuit breaker. Background Art
[0002] The mechanical structure of the frame circuit breaker is mainly composed of an operating mechanism, a main shaft assembly, a moving contact assembly, a static contact assembly, etc., and the cantilever on the main shaft assembly is connected to the moving contact assembly through a connecting rod structure. When the circuit breaker is in the closed position and receives an opening command, the operating mechanism is activated to drive the main shaft to rotate in the forward direction until the cantilever on the main shaft assembly contacts the limit shaft of the operating mechanism. Then, the cooperation between the cantilever and the connecting rod drives the moving contact assembly to operate and disconnect from the corresponding static contact assembly, so that a certain distance (opening distance) is formed between the moving contact assembly and the static contact assembly to meet the electrical insulation requirements and cut off the circuit. However, during the opening process, the cantilever of the main shaft assembly is limited because it moves at high speed and hits the limit shaft with strong force. Under the reaction force, the main shaft assembly will produce a certain amount of reverse rotation after hitting the limit shaft at high speed, thereby reducing the opening distance between the moving contact assembly and the static contact assembly. Especially when disconnecting a fault circuit (such as a short circuit), the reduced opening distance between the moving contact assembly and the static contact assembly will reduce the electrical insulation performance, making it difficult to extinguish the arc quickly, and even leading to disconnection failure. Utility Model Content
[0003] In response to the shortcomings of the existing technology, the utility model provides a reverse limit structure for the main shaft of a circuit breaker, which mainly solves the technical problem that the main shaft of the existing frame circuit breaker produces a certain amount of reverse rotation due to high-speed collision with the limit shaft during the circuit breaker opening process, thereby reducing the opening distance between the moving contact assembly and the static contact assembly.
[0004] To achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:
[0005] A reversal limit structure for a circuit breaker main shaft comprises a circuit breaker mechanism body, a main shaft and a limit shaft arranged on the circuit breaker mechanism body, a cantilever fixedly connected to the main shaft, and an anti-reversal component arranged between the circuit breaker mechanism body and the cantilever for limiting the reversal of the main shaft caused by the rebound force generated by the cantilever hitting the limit shaft when the circuit breaker is opened.
[0006] Furthermore, the cantilever is provided with a closing limit end which cooperates with the limit shaft in the closed state of the circuit breaker and an opening limit end which cooperates with the limit shaft in the open state of the circuit breaker, and a sliding gap of the limit shaft is formed between the closing limit end and the opening limit end. The anti-reversal component includes a trigger member arranged on the main body of the circuit breaker mechanism and a limit member movably connected to the cantilever and arranged corresponding to the trigger member. The free end of the limit member forms a limiting portion which is in contact with and limitedly cooperates with the limit shaft. The limit member is configured to be pushed open relative to the cantilever by generating an impact action with the trigger member when it moves with the cantilever to the open state position, so that its limiting portion enters the area of the sliding gap of the limit shaft and forms a limiting cooperation with the limit shaft, thereby preventing the main shaft from reversing when the main shaft collides with the limit shaft.
[0007] Furthermore, an elastic reset member is provided between the cantilever and the limit member, and the elastic reset member is configured to automatically reset the limit member relative to the cantilever and retract it to the area where its limit portion leaves the sliding gap of the limit shaft after the impact energy between the cantilever and the limit shaft is consumed.
[0008] Furthermore, the limiting member is rotatably connected to the cantilever through a rotating shaft, and the contact matching surface between the limiting portion of the limiting member and the limiting shaft is an arc surface, and the center A of the arc surface is eccentrically arranged with the axis B of the rotating shaft.
[0009] Furthermore, the connection position between the rotating shaft and the cantilever is biased toward the closing limit end of the cantilever, and the center A is offset relative to the axis B toward the closing limit end of the limit member.
[0010] Furthermore, a travel limiting structure is provided between the limiting member and the cantilever for limiting the movement travel of the limiting member relative to the cantilever.
[0011] Furthermore, a limit hole is opened on the cantilever, and a limit rod is provided on the limit member and placed in the limit hole. The limit matching structure of the limit hole and the limit rod forms a travel limit structure for limiting the opening action stroke of the limit member relative to the cantilever.
[0012] Furthermore, the elastic reset member is a torsion spring, one lead end of the torsion spring is connected to the main shaft, and the other lead end is connected to the limiting rod.
[0013] Furthermore, during the opening process of the circuit breaker, the impact action of the limit member and the trigger member is configured to precede the impact action of the opening limit end of the cantilever and the limit shaft, so that before the opening limit end contacts the limit shaft, the limit member has been hit and pushed open by the trigger member to a position ready to form a limit fit with the limit shaft.
[0014] Furthermore, the limiting member is formed with a curved impact surface portion for impact cooperation with the trigger member.
[0015] Based on the same inventive concept, the present invention also provides a circuit breaker, comprising any of the above-mentioned reverse rotation limiting structures for the main shaft of the circuit breaker.
[0016] The above technical solution has the following advantages or beneficial effects:
[0017] In the reversal limiting structure of the circuit breaker main shaft and the circuit breaker described in the present invention, an anti-reversal component is provided between the circuit breaker mechanism body and the cantilever. When the circuit breaker is opened, the anti-reversal component produces an anti-reversal effect on the main shaft, so that it can be better maintained in the open state position, effectively improving the problem of reversal caused by the reaction force of the impact on the main shaft and thus reducing the opening distance between the moving and static contact assemblies of the circuit breaker, which is beneficial to improving the electrical insulation performance of the circuit breaker when opening to enhance the reliability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a partial structural diagram of the circuit breaker in the closed state according to the embodiment of the utility model.
[0019] Figure 2 It is a partial structural diagram of the circuit breaker embodiment of the present invention when the opening limit end of the cantilever is close to the limit axis and the limit member just collides with the trigger member.
[0020] Figure 3 It is a partial structural diagram of an embodiment of the present utility model when the circuit breaker is opened, the opening limit end of the cantilever is close to the limit shaft and the limit member is pushed open by the trigger member to form a limit fit with the limit shaft.
[0021] Figure 4 yes Figure 3 A partial enlarged view of point A in the figure.
[0022] Figure 5 It is a partial structural diagram of the circuit breaker in the embodiment of the utility model in the open state and after the limit member is reset.
[0023] Figure 6 It is a partial structural diagram of the circuit breaker of the embodiment of the utility model maintained in the open state under the action of the opening spring.
[0024] Figure 7 It is a three-dimensional structural diagram of the reverse limiting structure of the circuit breaker main shaft according to an embodiment of the present utility model.
[0025] Figure 8 It is a schematic diagram of the exploded three-dimensional structure of the reverse limiting structure of the main shaft of the circuit breaker according to an embodiment of the present utility model.
[0026] Description of labels:
[0027] 1. Circuit breaker mechanism body, 2. Main shaft, 3. Limit shaft, 4. Cantilever, 5. Anti-reverse assembly, 6. Elastic reset member, 7. Rotating shaft, 41. Closing limit end, 42. Opening limit end, 43. Limit shaft sliding gap, 44. Limit hole, 51. Trigger, 52. Limit member, 521. Limit part, 522. Limit rod, 523. Impact curved surface. DETAILED DESCRIPTION
[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.
[0030] Please refer to the attached Figure 1 To the attached Figure 8 One embodiment of the present invention provides a reversal limiting structure for a main shaft of a circuit breaker, comprising a circuit breaker mechanism body 1, a main shaft 2 and a limiting shaft 3 provided on the main shaft 2, a cantilever 4 being fixedly connected to the main shaft 2, and an anti-reversal component 5 being provided between the main shaft 1 and the cantilever 4 for limiting the reversal of the main shaft 2 caused by the rebound force generated by the cantilever 4 hitting the limiting shaft 3 when the circuit breaker is opened. It can be understood that in this embodiment, by providing the anti-reversal component 5 between the main shaft 1 and the cantilever 4, when the circuit breaker is opened, the anti-reversal component 5 exerts an anti-reversal effect on the main shaft 2, so that the main shaft 2 can be better maintained in the open state position, effectively improving the problem of reversal caused by the reaction force of the main shaft 2 being hit, thereby reducing the opening distance between the moving and static contact assemblies of the circuit breaker, thereby facilitating improving the electrical insulation performance of the circuit breaker when it is opened to enhance the reliability of the circuit breaker.
[0031] Please refer to the attached Figure 1 To the attached Figure 8In one preferred embodiment, the cantilever 4 is provided with a closing limit end 41 that cooperates with the limit shaft 3 in the closed state of the circuit breaker and an opening limit end 42 that cooperates with the limit shaft 3 in the open state of the circuit breaker, and a limit shaft sliding gap 43 is formed between the closing limit end 41 and the opening limit end 42. The anti-reversal component 5 includes a trigger 51 arranged on the circuit breaker mechanism body 1 and a limit member 52 movably connected to the cantilever 4 and arranged corresponding to the trigger member 51. The free end of the limit member 52 forms a limit portion 521 that contacts and cooperates with the limit shaft 3. The limit member 52 is configured to be pushed open relative to the cantilever 4 by generating an impact action with the trigger member 51 when it moves with the cantilever 4 to the open state position, so that its limit portion 521 enters the area of the limit shaft sliding gap 43 and forms a limit cooperation with the limit shaft 3, thereby preventing the main shaft 2 from reversing when the main shaft 2 collides with the limit shaft 3.
[0032] Please refer to the attached Figure 1 To the attached Figure 5In one preferred embodiment, an elastic reset member 6 is provided between the cantilever 4 and the limit member 52. The elastic reset member 6 is configured to automatically reset the limit member 52 relative to the cantilever 4 and retract it to the area where its limit portion 521 leaves the limit shaft sliding gap 43 after the impact energy between the cantilever 4 and the limit shaft 3 is consumed. The limit member 52 is rotatably connected to the cantilever 4 through the rotating shaft 7. The contact mating surface between the limit portion 521 of the limit member 52 and the limit shaft 3 is an arc surface, and the center A of the arc surface is eccentrically arranged with the axis B of the rotating shaft 7. Furthermore, the connection position of the rotating shaft 7 and the cantilever 4 is biased toward the closing limit end 41 of the cantilever 4, and the center A is offset relative to the axis B toward the closing limit end 41 of the limit member 52. It can be understood that in this embodiment, by configuring the contact fitting surface between the limiting portion 521 of the limiting member 52 and the limiting shaft 3 as an arc surface, and the center A of the circle is offset relative to the axis B toward the closing limit end 41 of the limiting member 52, when the opening limit end 42 of the cantilever 4 hits the limit shaft 3, the arc surface of the limiting portion 521 of the limiting member 52 pushed open by the trigger member 51 will interfere with the other side of the limit shaft 3, and under the action of the impact reaction force, the cantilever 4 has a movement tendency to drive the main shaft 2 to reverse, but because the center A is offset relative to the axis B toward the closing limit end 41 of the limiting member 52, the limiting member 52 will remain in an open state under the contact fitting function of its arc surface and the limit shaft 3 and will continue to produce an anti-reverse limiting effect on the main shaft 2. And by arranging an elastic reset member 6 between the cantilever 4 and the limit member 52, when the opening limit end 42 of the cantilever 4 collides with the limit shaft 3 and the impact energy is consumed (when the cantilever 4 eliminates the trend of the main shaft 2 to reverse under the joint action of the impact reaction force and the opening spring, there is no interaction force between the arc surface of the limit part 521 and the limit shaft), then under the reset force of the elastic reset member 6, the limit member 52 will automatically reverse and reset relative to the cantilever 4 to facilitate subsequent closing operations.
[0033] Please refer to the attached Figure 3 , Attachment Figure 8 In one preferred embodiment, a travel limiting structure for limiting the movement stroke of the limiter 52 relative to the cantilever 4 is provided between the limiter 52 and the cantilever 4. Preferably, a limit hole 44 is provided on the cantilever 4, and a limit rod 522 is provided on the limiter 52 and placed in the limit hole 44. The limiting cooperation structure of the limit hole 44 and the limit rod 522 forms a travel limiting structure for limiting the opening movement stroke of the limiter 52 relative to the cantilever 4. However, it should be understood by those skilled in the art that in other embodiments, other limiting structures may also be provided between the limiter 52 and the cantilever 4 to limit the maximum opening angle of the limiter 52 relative to the cantilever 4, and the limiter is not limited to the specific implementation manner disclosed in this embodiment.
[0034] Please refer to the attached Figure 8In one preferred embodiment, the elastic return member 6 is a torsion spring, one lead end of which is connected to the main shaft 2, and the other lead end is connected to the limiting rod 522. However, those skilled in the art will appreciate that in other embodiments, the elastic return member 6 may also be other elastic return structures, such as a tension spring, and is not limited to the specific implementation disclosed in this embodiment. As long as the limiting member 52 can be reset and rotated relative to the cantilever 4 without interfering with the movement of other components in the mechanism, those skilled in the art may make specific arrangements according to specific needs.
[0035] Please refer to the attached Figure 1 To the attached Figure 5 In one preferred embodiment, during the circuit breaker opening process, the impact of the limit member 52 and the trigger member 51 is configured to precede the impact of the opening limit end 42 of the cantilever 4 and the limit shaft 3. This allows the limit member 52 to be impacted and pushed open by the trigger member 51 to a position where it is ready to form a limiting engagement with the limit shaft 3 before the opening limit end 42 contacts the limit shaft 3. Preferably, the limit member 52 is formed with a curved impact surface 523 for impact engagement with the trigger member 51.
[0036] An embodiment of the present invention further provides a circuit breaker, comprising the reverse rotation limiting structure of the circuit breaker main shaft according to any of the above embodiments.
[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present invention.
Claims
1. A reverse limit structure for a circuit breaker main shaft, comprising a circuit breaker mechanism body (1), a main shaft (2) and a limit shaft (3) arranged on the circuit breaker mechanism body (1), wherein a cantilever (4) is fixedly connected to the main shaft (2), and characterized in that: An anti-reversal component (5) is provided between the circuit breaker mechanism body (1) and the cantilever (4) for limiting the reversal of the main shaft (2) caused by the rebound force generated by the cantilever (4) hitting the limit shaft (3) when the circuit breaker is opened.
2. The reverse rotation limiting structure of the circuit breaker main shaft according to claim 1, characterized in that: The cantilever (4) is provided with a closing limit end (41) that cooperates with the limit shaft (3) when the circuit breaker is in a closed state, and an opening limit end (42) that cooperates with the limit shaft (3) when the circuit breaker is in an open state. A limit shaft sliding gap (43) is formed between the closing limit end (41) and the opening limit end (42). The anti-reversal component (5) includes a trigger (51) provided on the circuit breaker mechanism body (1) and a limit member (52) movably connected to the cantilever (4) and provided corresponding to the trigger (51). The free end of the limiting member (52) forms a limiting portion (521) that is in contact with and limited by the limiting shaft (3). The limiting member (52) is configured to be pushed open relative to the cantilever (4) by generating an impact action with the trigger member (51) when it moves with the cantilever (4) to the open state position, so that the limiting portion (521) enters the area of the sliding gap (43) of the limiting shaft and forms a limiting fit with the limiting shaft (3), thereby preventing the main shaft (2) from reversing when the main shaft (2) collides with the limiting shaft (3).
3. The reverse rotation limiting structure of the circuit breaker main shaft according to claim 2, characterized in that: An elastic reset member (6) is provided between the cantilever (4) and the limiting member (52). The elastic reset member (6) is configured to automatically reset the limiting member (52) relative to the cantilever (4) and retract it to an area where its limiting portion (521) leaves the limiting shaft sliding gap (43) after the collision energy between the cantilever (4) and the limiting shaft (3) is consumed.
4. The reverse rotation limiting structure of the circuit breaker main shaft according to claim 3, characterized in that: The limiting member (52) is rotatably connected to the cantilever (4) via the rotating shaft (7); the contact matching surface between the limiting portion (521) of the limiting member (52) and the limiting shaft (3) is an arc surface, and the center A of the arc surface is eccentrically arranged with the axis B of the rotating shaft (7).
5. The reverse rotation limiting structure of the circuit breaker main shaft according to claim 4, characterized in that: The connection position between the rotating shaft (7) and the cantilever (4) is biased toward the closing limit end (41) of the cantilever (4), and the center A is offset relative to the axis B toward the closing limit end (41) of the limit member (52).
6. The reverse rotation limiting structure of the circuit breaker main shaft according to claim 2, characterized in that: A travel limiting structure for limiting the movement travel of the limiting member (52) relative to the cantilever (4) is provided between the limiting member (52) and the cantilever (4).
7. The reverse rotation limiting structure of the circuit breaker main shaft according to claim 6, characterized in that: A limiting hole (44) is provided on the cantilever (4), and a limiting rod (522) is provided on the limiting member (52) and is placed in the limiting hole (44). The limiting matching structure of the limiting hole (44) and the limiting rod (522) forms a travel limiting structure for limiting the opening stroke of the limiting member (52) relative to the cantilever (4).
8. The reverse rotation limiting structure of the circuit breaker main shaft according to claim 2, characterized in that: During the opening process of the circuit breaker, the impact action of the limit member (52) and the trigger member (51) is configured to precede the impact action of the opening limit end (42) of the cantilever (4) and the limit shaft (3), so that before the opening limit end (42) contacts the limit shaft (3), the limit member (52) has been impacted and pushed open by the trigger member (51) to a position where it is ready to form a limit fit with the limit shaft (3).
9. The reverse rotation limiting structure of the circuit breaker main shaft according to claim 8, characterized in that: The limiting member (52) is formed with a collision curved surface portion (523) for collision cooperation with the trigger member (51).
10. A circuit breaker, characterized in that: The invention comprises the reverse rotation limiting structure of the circuit breaker main shaft according to any one of claims 1 to 9.