Reverse limiting structure of circuit breaker main shaft and circuit breaker

Abstract

The invention discloses a circuit breaker main shaft reversal limiting structure and a circuit breaker, and the structure comprises a circuit breaker mechanism main body, and a main shaft and a limiting shaft which are disposed on the circuit breaker mechanism main body. And an anti-reversion assembly used for limiting reversion of the main shaft caused by rebound acting force generated when the cantilever impacts the limiting shaft when the circuit breaker is opened is arranged between the circuit breaker mechanism main body and the cantilever. According to the invention, the anti-reversion assembly is arranged between the circuit breaker mechanism main body and the cantilever, and when the circuit breaker is opened, the anti-reversion assembly generates an anti-reversion effect on the main shaft, so that the main shaft can be well kept at an opening state position; the problem that the opening distance between the moving contact assembly and the static contact assembly of the circuit breaker is reduced due to the fact that the main shaft is subjected to reverse rotation caused by impact counter-acting force is effectively solved, and then the electrical insulation performance of the circuit breaker during opening is improved, so that the reliability of the circuit breaker is improved.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and 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 hits the limit shaft of the operating mechanism, and then the cooperation of the cantilever and the connecting rod drives the moving contact assembly to move 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 by its high-speed movement and strong impact against the limit shaft. 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. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a reversal 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 object, the present invention is achieved through the following technical solutions: A reversal limit structure for a main shaft of a circuit breaker comprises a circuit breaker mechanism body, a main shaft and a limit shaft arranged on the circuit breaker mechanism body, a cantilever is fixedly connected to the main shaft, and an anti-reversal component is 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.

[0005] 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 limit 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 opening state position, so that its limit 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.

[0005] 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.

[0006] Furthermore, the limiting member is rotatably connected with the cantilever through the 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.

[0007] Furthermore, the connection position between the rotating shaft and the cantilever is biased toward the closing limit end of the cantilever, and the center of the circle A is offset relative to the axis B toward the closing limit end of the limit member.

[0008] Furthermore, a travel limiting structure for limiting the movement travel of the limiter relative to the cantilever is provided between the limiter and the cantilever.

[0009] Furthermore, a limit hole is provided on the cantilever, and a limit rod is provided on the limit member and is 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 travel of the limit member relative to the cantilever.

[0010] 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.

[0011] 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.

[0012] Furthermore, the limiting member is formed with a collision curved surface portion for collision cooperation with the trigger member.

[0013] Based on the same inventive concept, the present invention further provides a circuit breaker, comprising any of the above-mentioned reverse limiting structures for the main shaft of the circuit breaker.

[0014] The above technical solution has the following advantages or beneficial effects:

[0015] In the reversal limit structure of the circuit breaker main shaft and the circuit breaker described in the present invention, an anti-reversal component is arranged between the circuit breaker mechanism body and the cantilever. When the circuit breaker is opened, the anti-reversal component has 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

[0016] Figure 1 It is a partial structural schematic diagram of a circuit breaker in a closed state according to an embodiment of the present invention.

[0017] Figure 2 It is a partial structural schematic diagram when the opening limit end of the cantilever of the circuit breaker of the embodiment of the present invention is close to the limit axis and the limit member just collides with the trigger member when the circuit breaker is opened.

[0018] Figure 3 It is a partial structural schematic diagram when the circuit breaker of the embodiment of the present invention 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.

[0019] Figure 4 yes Figure 3 A partial enlarged view of point A in the figure.

[0020] Figure 5 It is a schematic diagram of the local structure of the circuit breaker in the embodiment of the present invention in the open state and after the limiter is reset.

[0021] Figure 6 It is a partial structural schematic diagram of the circuit breaker of the embodiment of the present invention being kept in the open state under the action of the opening spring.

[0022] Figure 7 It is a three-dimensional structural schematic diagram of the reverse limiting structure of the main shaft of the circuit breaker according to an embodiment of the present invention.

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure decomposition of the reverse limiting structure of the main shaft of the circuit breaker according to an embodiment of the present invention.

[0024] Description of labels:

[0025] 1. Circuit breaker mechanism body, 2. Main shaft, 3. Limit shaft, 4. Cantilever, 5. Anti-reversal 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 member, 52. Limit member, 521. Limit part, 522. Limit rod, 523. Impact curved surface. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Please refer to the attached Figure 1 To Attachment Figure 8 An embodiment of the present invention provides a reverse limit structure of a main shaft of a circuit breaker, comprising a circuit breaker mechanism body 1, a main shaft 2 and a limit shaft 3 arranged on the circuit breaker mechanism body 1, a cantilever 4 fixedly connected to the main shaft 2, and an anti-reversal component 5 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. It can be understood that in this embodiment, by arranging the anti-reversal component 5 between the circuit breaker mechanism body 1 and the cantilever 4, when the circuit breaker is opened, the anti-reversal component 5 produces an anti-reversal effect on the main shaft 2, 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 main shaft 2 being hit and thus reducing the opening distance between the moving and static contact components of the circuit breaker, thereby facilitating improving the electrical insulation performance of the circuit breaker when the circuit breaker is opened to improve the reliability of the circuit breaker.

[0029] Please refer to the attached Figure 1 To Attachment Figure 8In one preferred embodiment, the cantilever 4 is provided with a closing limit end 41 which cooperates with the limit shaft 3 in the closed state of the circuit breaker and an opening limit end 42 which 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 member 51 arranged on the circuit breaker mechanism body 1 and a limit member 52 which is 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 which is in contact with the limit shaft 3 and is limitedly matched. 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 match with the limit shaft 3, thereby preventing the main shaft 2 from reversing when the main shaft 2 collides with the limit shaft 3.

[0030] Please refer to the attached Figure 1 To Attachment 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 recover it to the area where its limit portion 521 leaves the limit shaft sliding gap 43 after the collision energy between the cantilever 4 and the limit shaft 3 is consumed. The limit member 52 is rotatably connected with 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 the present embodiment, by configuring the contact mating surface between the limit portion 521 of the limit member 52 and the limit shaft 3 as an arc surface, and the center A is offset relative to the axis B toward the closing limit end 41 of the limit member 52, when the opening limit end 42 of the cantilever 4 hits the limit shaft 3, the arc surface of the limit portion 521 of the limit member 52 pushed open by the trigger member 51 will contact with the other side of the limit shaft 3, and under the action of the impact reaction force, the cantilever 4 has a 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 limit member 52, therefore, the limit member 52 will remain in an open state under the contact mating 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 reverse movement trend of the main shaft 2 driven by 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 the subsequent closing operation.

[0031] 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 to be placed in the limit hole 44. The limit matching 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, those skilled in the art should understand that in other embodiments, other limit structures may 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 are not limited to the specific implementation methods disclosed in this embodiment.

[0032] Please refer to the attached Figure 8In one preferred embodiment, the elastic reset member 6 is a torsion spring, one of the lead ends of the torsion spring is connected to the main shaft 2, and the other lead end is connected to the limit rod 522. However, those skilled in the art should understand that in other embodiments, the elastic reset member 6 can also be other elastic reset structures, such as a tension spring, etc., and is not limited to the specific implementation method disclosed in this embodiment. As long as the limit member 52 can be reset and rotated relative to the cantilever 4 without interfering with the actions of other components in the mechanism, those skilled in the art can make specific arrangements according to specific needs.

[0033] Please refer to the attached Figure 1 To Attachment Figure 5 In one preferred embodiment, during the opening process of the circuit breaker, the impact action of the limiter 52 and the trigger member 51 is configured to precede the impact action of the opening limiter end 42 of the cantilever 4 and the limiter shaft 3, so that before the opening limiter end 42 contacts the limiter shaft 3, the limiter 52 has been impacted and pushed open by the trigger member 51 to a position ready to form a limit fit with the limiter shaft 3. Preferably, the limiter 52 is formed with an impact curved surface portion 523 for impact fit with the trigger member 51.

[0034] An embodiment of the present invention further provides a circuit breaker, comprising the reverse limiting structure of the main shaft of the circuit breaker according to any of the above embodiments.

[0035] As described above, the embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. 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 replace some of the technical features therein by equivalents. These modifications or replacements do not deviate the corresponding technical solutions 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 making creative efforts belong to the protection scope of the present invention.

Claims

1. A reverse limit structure for a main shaft of a circuit breaker, comprising a circuit breaker mechanism body (1), a main shaft (2) and a limit shaft (3) arranged on the circuit breaker mechanism body (1), a cantilever (4) being fixedly connected to the main shaft (2), 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 limit 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) which cooperates with the limit shaft (3) when the circuit breaker is in a closed state, and an opening limit end (42) which 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) comprises a trigger member (51) arranged on the circuit breaker mechanism body (1) and a limit member (52) which is movably connected to the cantilever (4) and arranged corresponding to the trigger member (51). The free end of the limiting member (52) forms a limiting portion (521) that contacts and cooperates with 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-gate state position, so that the limiting portion (521) enters the area of ​​the sliding gap (43) of the limiting shaft and forms a limiting cooperation 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 limit 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 limit member (52). The elastic reset member (6) is configured to automatically reset the limit member (52) relative to the cantilever (4) and recover the limit member (52) to an 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.

4. The reverse limit 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 respect to 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 towards the closing limit end (41) of the cantilever (4), and the center of the circle A is offset relative to the axis B towards the closing limit end (41) of the limit member (52).

6. The reverse limit 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 limiter (52) relative to the cantilever (4) is provided between the limiter (52) and the cantilever (4).

7. The reverse limit structure of the main shaft of the circuit breaker according to claim 6, characterized in that: A limit hole (44) is provided on the cantilever (4), and a limit rod (522) is provided on the limit member (52) and is placed in the limit hole (44). The limit matching structure of the limit hole (44) and the limit rod (522) forms a travel limit structure for limiting the opening stroke of the limit member (52) relative to the cantilever (4).

8. The reverse limit structure of the main shaft of the circuit breaker 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 first impacted and pushed open by the trigger member (51) to a position 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 an impact curved surface portion (523) that impacts with the trigger member (51).

10. A circuit breaker, characterized in that: The invention comprises a reverse limiting structure for a main shaft of a circuit breaker as claimed in any one of claims 1 to 9.

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