Circuit breaker and mechanical anti-tripping device thereof
By introducing a mechanical anti-pumping device into the circuit breaker, the problem of multiple closing and tripping caused by mechanical failure is solved. Combined with electrical anti-pumping, the circuit breaker achieves safe and stable operation and miniaturized design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EATON ELECTRICAL EQUIP CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-05-29
AI Technical Summary
The mechanical failure of existing circuit breakers leads to repeated closing and tripping, causing equipment damage and power system instability. Electrical anti-pumping devices also have the problem of failure due to mechanical failure.
Introducing a mechanical anti-pumping device into the circuit breaker, the clutch component is driven to engage and disengage with the closing half shaft through the action of the closing mechanism, so that the closing half shaft automatically resets after energy storage, preventing reverse compound circuit breaker tripping, and providing dual protection in combination with the electrical anti-pumping device.
It effectively prevents circuit breakers from tripping due to mechanical failure, protects the mechanism from damage, ensures the safe and stable operation of the power system, and adapts to the design requirements of various types of circuit breakers.
Smart Images
Figure CN224304657U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit breaker anti-pumping technology, and in particular to circuit breakers and their mechanical anti-pumping devices. Background Technology
[0002] Circuit breaker anti-pumping refers to preventing multiple "trip-close" jumps that occur when a circuit breaker cannot remain in the closed position due to a fault in the closing line or a fault in the circuit breaker itself, because the closing command has not been released. In other words, regardless of the duration of a closing command, the circuit breaker is only allowed to close once. The second closing of the circuit breaker must be based on the disappearance of the previous closing command and the resending of the closing command. Multiple "trip-close" jumps during a single closing command can lead to equipment damage and instability, thereby seriously threatening the safe and stable operation of the power system.
[0003] Many circuit breakers on the market are designed with anti-pumping functions, but these are mostly electrical anti-pumping mechanisms, with very few using mechanical ones. The main drawback of electrical anti-pumping is that if, for some reason, the closing button becomes stuck, preventing it from automatically resetting after being pressed, or if the operator doesn't remove their hand promptly after manual closing, leaving the button pressed, the circuit breaker will remain permanently disconnected. Since the energy storage circuit is already energized, the circuit breaker will repeatedly cycle between energy storage and closing actions, placing a burden on the mechanism and potentially causing damage, leading to power system failures.
[0004] Therefore, there is a demand in the industry for a mechanical anti-pumping device that has advantages such as being able to be used in conjunction with electrical anti-pumping devices to prevent circuit breakers from tripping due to mechanical failure. Summary of the Invention
[0005] The present invention aims to provide a mechanical anti-pumping device for circuit breakers, which can at least solve some of the above-mentioned technical problems.
[0006] This invention also aims to provide a circuit breaker that applies the above-mentioned improved mechanical anti-jump device.
[0007] According to one aspect of the present invention, a mechanical anti-pumping device for a circuit breaker is provided. The circuit breaker has a frame, a closing half-shaft and an operating shaft respectively rotatably connected to the frame, and an energy storage mechanism connected to the operating shaft. The closing half-shaft can lock the operating shaft to limit the energy release of the energy storage mechanism. The mechanical anti-pumping device includes: a closing push plate rotatably connected to the closing half-shaft; an actuator engaged with the closing half-shaft; a clutch rotatably disposed relative to the closing push plate and extending toward the actuator, the rotation axis of the clutch being parallel and spaced apart from the rotation axis of the closing push plate, wherein the clutch is configured to be driven by the closing push plate to engage the actuator, such that the actuator drives the closing half-shaft to release the lock on the operating shaft; and a movable member rotatably mounted on the frame and configured to engage the clutch in response to rotation of the operating shaft, causing the clutch to move in the opposite direction and away from the actuator.
[0008] According to the mechanical anti-pumping device for circuit breakers in this scheme, a clutch component is added to the closing mechanism of the circuit breaker. The action of the closing mechanism drives the clutch component to engage and disengage from the closing half-shaft, allowing the closing half-shaft, along with the closing holding mechanism attached to it, to automatically reset after the energy storage mechanism is released. Thus, even if the closing button remains in the running state, the circuit breaker can remain in the energy storage state after re-energy storage, preventing reverse tripping during a single closing command and thus preventing damage to the mechanism. This mechanical anti-pumping device has a simple and compact structure, occupying little space. Therefore, it can adapt to various types of circuit breakers without affecting the function and operation of the original opening mechanism, exhibiting good adaptability and aligning well with the trend of circuit breaker miniaturization. The clutch component has a large operating margin and is not sensitive to size, ensuring stable engagement with the closing half-shaft. As long as the circuit breaker can close normally, the mechanical anti-pumping device will switch on and off normally and play its role, thus cooperating with the electrical anti-pumping device to ensure that the circuit breaker is under dual mechanical and electrical anti-pumping protection, thereby improving the safety of circuit breaker operation.
[0009] In some embodiments, the closing push plate is provided with a first pivot parallel to the closing half-axis at a position offset from the closing half-axis, and the clutch is rotatably connected to the first pivot.
[0010] In some embodiments, the closing push plate is rotatable about the closing half-axis to drive the clutch, and the closing push plate is connected to a first biasing member configured to apply a force to the closing push plate to reverse it and reset it.
[0011] In some embodiments, the clutch is connected to a second biasing member, which is configured such that after the clutch is driven away from the actuator by the moving member, the clutch is driven back to its original position by the second biasing member.
[0012] In some embodiments, the movable member is rotatable about a second pivot connected to the frame to engage the clutch, and the movable member is connected to a third biasing member configured to apply a force to the movable member to reverse it and reset it.
[0013] In some embodiments, the mechanical anti-jump device includes a switching pin that is responsive to rotation of the operating shaft relative to the frame and drives the movable member to engage the clutch.
[0014] In some embodiments, the circuit breaker includes a main shaft rotatably connected to the frame and a half-shaft connected to the frame parallel to the main shaft, the half-shaft being pivotally connected to a first link and the main shaft being pivotally connected to a second link, the first link and the second link being each pivotally connected to the changeover pin.
[0015] In some embodiments, the clutch has a spaced-apart first engagement portion and a second engagement portion, wherein the clutch is configured such that during engagement of the actuator with the first engagement portion, the second engagement portion avoids each other, and during engagement of the clutch in response to rotation of the operating shaft, the movable member abuts against the second engagement portion and pushes the clutch in the opposite direction.
[0016] In some embodiments, the second engagement portion of the clutch is configured with a ramp, and the end of the movable member near the clutch can slide along the ramp to avoid each other.
[0017] According to another aspect of the present invention, a circuit breaker is provided, comprising: a frame; a closing half-shaft rotatably connected to the frame; an operating shaft rotatably connected to the frame; and an energy storage mechanism connected to the operating shaft; wherein the closing half-shaft can lock the operating shaft to limit the energy release of the energy storage mechanism; wherein the circuit breaker further comprises a mechanical anti-pumping device, the mechanical anti-pumping device being the aforementioned mechanical anti-pumping device.
[0018] Other features and advantages of this invention will partly be apparent to those skilled in the art upon reading this application, and partly will be described below in conjunction with the accompanying drawings in the detailed description. Attached Figure Description
[0019] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein:
[0020] Figure 1 This is a partial schematic diagram of a circuit breaker according to an embodiment of the present invention;
[0021] Figure 2 This is a partial schematic diagram of a circuit breaker according to an embodiment of the present invention, wherein some supports and actuating mechanisms are omitted for clarity.
[0022] Figure 3 This is a partial schematic diagram of a circuit breaker according to an embodiment of the present invention, which mainly shows a part of the tripping mechanism and the anti-pumping device;
[0023] Figure 4 This is a schematic diagram of an anti-jump device according to an embodiment of the present invention;
[0024] Figure 5 This is a schematic diagram of an anti-jump device according to an embodiment of the present utility model, wherein the closing push plate is omitted;
[0025] Figure 6 This is a schematic diagram of the anti-jump device according to an embodiment of the present invention from another angle after omitting the closing push plate;
[0026] Figure 7 This is a schematic diagram of a clutch component according to an embodiment of the present invention.
[0027] Explanation of reference numerals in the attached figures
[0028] 1-Frame; 10-Support plate; 2-Closing half-shaft; 21-Retaining element; 3-Closing push plate; 30-First plate section; 31-Second plate section; 32-Third plate section; 33-First biasing element; 4-Clutch element; 40-Second biasing element; 41-First pivot; 42-First joint; 43-Second joint; 44-Hole; 5-Actuator; 50-First section; 51-Second section; 52-Third section; 6-Moving element; 60-Second pivot; 61-Joint end; 7-Converter pin; 70-First connecting rod; 71-Half-shaft; 72-Second connecting rod; 8-Main shaft; 9-Operating shaft; 91-Cam Detailed Implementation
[0029] The schematic solutions of the technical solutions disclosed in this utility model are now described in detail with reference to the accompanying drawings. Although the drawings are provided to illustrate some embodiments of this utility model, the drawings are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of this utility model. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.
[0030] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.
[0031] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.
[0032] Figures 1 to 3 The mechanical anti-pumping device is shown as a whole. Due to its simple structure and compact layout, this device can be used on various types of circuit breakers, such as E-VAC, 3AS4, and VS1 circuit breakers, with virtually no need to modify the original layout and components of the circuit breaker, exhibiting good adaptability. The circuit breaker may include a frame 1 and various functional structures mounted on the frame 1, such as opening mechanisms, closing mechanisms, insulation mechanisms, transmission mechanisms, and various protective devices. The frame 1 may be partially or entirely formed by assembling multiple support plates 10, which define a space to accommodate the aforementioned functional structures. Figures 1 to 3 An exemplary embodiment shows that a closing mechanism and a mechanical anti-jump device are arranged in the space enclosed by a pair of opposing support plates 10.
[0033] According to the illustrated embodiment, the closing half-shaft 2 and the operating shaft 9 are mounted parallel to each other between a pair of support plates 10, and each can rotate about its own central axis. A retainer 21 is connected to the closing half-shaft 2 to form a rotation stop with the operating shaft 9 or a roller connected to the operating shaft 9. The retainer 21 can be, for example, a cantilever arm extending from the closing half-shaft 2. This cantilever arm, with its free end away from the closing half-shaft 2, can press against or lock the closing operating shaft 9 or the roller connected to the operating shaft 9 from one side, thereby preventing the closing rotation of the operating shaft 9 and thus limiting the release of energy by the closing energy storage mechanism connected to the operating shaft 9. Figure 2 Using the orientation shown as a reference, once the closing half-shaft 2 drives the retaining member 21 to rotate clockwise as shown in the figure and move away from the operating shaft 9, under the action of the closing energy storage spring (e.g., tension), the operating shaft 9 can move along... Figure 2 The clockwise rotation shown causes the cam 91, which is mounted on the operating shaft 9, to rotate synchronously. As the flange of the cam 91 falls, it can push the changeover pin 7 located below it.
[0034] The changeover pin 7 is located at the intersection of the first link 70 and the second link 72, and is pivotally connected to the ends of the first link 70 and the second link 72, respectively. The other end of the first link 70 is pivotally connected to a half-shaft 71 mounted on the support plate 10, while the other end of the second link 72 is pivotally connected to a crank arm extending from the main shaft 8 of the circuit breaker. The main shaft 8 is connected to a moving contact mechanism. The movement of the changeover pin 7, driven by the cam 91, can drive the main shaft 8 along... Figure 2 The circuit breaker rotates counterclockwise as shown, thereby pushing the moving contact closer to the stationary contact and closing the circuit breaker.
[0035] Both electrical and mechanical anti-pumping devices are installed on the aforementioned closing mechanism to ensure the circuit breaker operates safely and stably under dual mechanical and electrical anti-pumping protection. The electrical anti-pumping device can utilize existing structures and will not be described in detail here. This section primarily describes the mechanical anti-pumping device, which can be used in conjunction with the electrical anti-pumping device. The core of this mechanical anti-pumping device is a clutch mechanism that operates in a controlled manner in response to the closing process. As long as the circuit breaker can close normally, the clutch mechanism can switch normally to achieve the anti-pumping function, preventing the circuit breaker from reversing between closing and opening during a single closing command due to component failure of the electrical anti-pumping device.
[0036] According to the illustrated embodiment, a closing push plate 3 rotatable about the closing half-shaft 2 is mounted on the closing half-shaft 2. The closing rotation of this closing push plate 3 (around the closing half-shaft 2) Figure 2 The clockwise rotation shown is driven by an electric or manual closing mechanism, while the reset rotation of the closing push plate 3 (along...) Figure 2 The counterclockwise rotation shown is driven by a first biasing member 33 connected to the closing push plate 3. In one embodiment, the first biasing member 33 is a torsion spring, which is sleeved on the closing half shaft 2, with one leg abutting against the closing push plate 3 and the other leg abutting against the support plate 10.
[0037] like Figure 4 As shown, the closing push plate 3 can be a frame structure formed by integrally bending a sheet metal, including a first plate segment 30 and a second plate segment 31 opposite each other, and a third plate segment 32 connected at an angle (e.g., 90 degrees) between the first plate segment 30 and the second plate segment 31. The first plate segment 30, the second plate segment 31 and the third plate segment 32 form a slot with one side open, through which the closing half-shaft 2 passes. At least a part of the clutch structure can be accommodated in this slot, reducing the overall space occupied and making the anti-jump device more compact.
[0038] refer to Figures 4 to 7As an example of a clutch structure, a clutch element 4 is pivotally mounted on the closing push plate 3. This clutch element 4 can drive the closing half-shaft 2 to rotate in response to the closing rotation of the closing push plate 3, thereby causing the closing half-shaft 2, together with the retaining member 21, to avoid the operating shaft 9, allowing the closing energy storage mechanism to release energy. The clutch element 4 can also disengage from the closing half-shaft 2 in response to the closing rotation of the operating shaft 9, allowing the closing half-shaft 2 to return to a position that interferes with the closing rotation of the operating shaft 9 under the action of the reset biasing member.
[0039] In the illustrated embodiment, a first pivot 41 is provided on the first section 30 of the closing push plate 3. The first pivot 41 extends parallel to the closing half-shaft 2 within the groove of the closing push plate 3 and is spaced apart from the closing half-shaft 2 by a certain distance. The clutch 4 is provided with a hole 44, and the clutch 4 is rotatably mounted in the groove of the closing push plate 3 by passing the first pivot 41 through the hole 44. The end of the clutch 4 away from the first pivot 41 can extend out of the groove of the closing push plate 3.
[0040] To cooperate with the clutch 4, an actuator 5 is provided on the closing half-shaft 2. The actuator 5 is fixedly connected to the closing half-shaft 2, for example, by bolts or pins, so that it can rotate synchronously with the closing half-shaft 2. The actuator 5 can be designed with a specific configuration to adapt to the relative positional relationship between the closing half-shaft 2 and the clutch 4. In the embodiment shown in the figure, the actuator 5 includes a first section 50 attached to the closing half-shaft 2, a second section 51 connected at an angle to the first section 50 and extending toward the clutch 4, and a third section 52 connected at an angle to the second section 51 and extending in a direction away from the first section 50 to approach the clutch 4. The third section 52 also serves as a contact end that can be directly driven and engaged by the clutch 4. The first section 50, the second section 51, and the third section 52 of the actuator 5 can be formed by integrally bending a plate. For compact layout considerations, a portion of the actuator 5 can be accommodated in a groove in the closing half-shaft 2.
[0041] When the closing push plate 3 rotates due to the electric or manual closing mechanism, it drives the clutch 4 to move synchronously, causing the clutch 4 to press its first engagement portion 42 against the third section 52 of the actuator 5. This causes the actuator 5 to rotate the closing half-shaft 2 to allow the operating shaft 9 to open and the closing energy storage spring to release energy. The first engagement portion 42 can be configured in any suitable shape, such as the plane shown in the figure.
[0042] To enable the clutch 4 to automatically disengage from the actuator 5 at the intended stage, a second pivot 60 is provided on the support plate 10, and the movable member 6 is rotatably mounted on the second pivot 60. The movable member 6 has an end 62 extending toward the clutch 4 and a bent engagement end 61 for direct drive engagement by the changeover pin 7. During the period when the clutch 4 is driven by the closing push plate 3 to press against the actuator 5, the movable member 6 is not affected by the clutch 4. A second engagement portion 43 with a slope configuration can be provided on the clutch 4 to achieve this purpose. This slope is spaced from and extends obliquely relative to the first engagement portion 42. When the clutch 4 is driven by the closing push plate 3 to press against the actuator 5, the end 62 of the movable member 6 can slide along the slope, thereby allowing the movable member 6 to avoid the pressing action of the clutch 4 during this period.
[0043] After the closing energy storage mechanism releases energy, the operating shaft 9 rotates to close and drive the changeover pin 7 to move. The changeover pin 7 falls and drives the bent and extended engagement end 61 of the movable part 6 to engage, thereby pushing the movable part 6 along... Figure 2 The circuit breaker rotates clockwise as shown. During the rotation of the movable part 6, the end 62 pushes against the second engagement portion 43 of the clutch 4, causing the clutch 4 to reverse, thereby disengaging the actuator 5 from the clutch 4. Thus, the closing half-shaft 2 is allowed to return to its initial position, which can form a closing rotation interference with the operating shaft 9, driven by its own reset bias member. Afterwards, even if the closing command unexpectedly continues for a certain period of time, and the closing energy storage spring re-stores energy, the closing energy storage spring cannot release energy due to the obstruction of the closing half-shaft 2 and its retaining member 21. Therefore, the circuit breaker will not experience repeated "closing-opening" jumps.
[0044] After the clutch 4 is pushed away from the actuator 5 and disengaged from the movable member 6, under the action of the second biasing member 40, the clutch 4 can return to its initial position close to the actuator 5 but not engaged or in contact with it. In the illustrated embodiment, the second biasing member 40 is a torsion spring sleeved on the first pivot 41, with one leg abutting against the second pivot 41 and the other leg abutting against the clutch 4. Similarly, the movable member 6 can also return to its initial position, independent of the clutch 4, by means of its biasing member (not shown). This biasing member can be a torsion spring sleeved on the second pivot 60, with one leg abutting against the movable member 6 and the other leg abutting against the second pivot 60 or the support plate 10.
[0045] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
[0046] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.
Claims
1. A mechanical anti-pumping device for a circuit breaker, the circuit breaker having a frame (1), a closing half-shaft (2) and an operating shaft (9) respectively rotatably connected to the frame (1), and an energy storage mechanism connected to the operating shaft (9), wherein the closing half-shaft (2) can lock the operating shaft (9) to limit the energy release of the energy storage mechanism, characterized in that, The mechanical anti-jump device includes: The closing push plate (3) is rotatably connected to the closing half shaft (2); Actuator (5) is engaged with the closing half shaft (2); A clutch (4) is rotatably disposed relative to the closing push plate (3) and extends toward the actuator (5), wherein the rotation axis of the clutch (4) is parallel and spaced apart from the rotation axis of the closing push plate (3), wherein the clutch (4) is configured to be driven by the closing push plate (3) to engage the actuator (5), such that the actuator (5) drives the closing half shaft (2) to release the locking of the operating shaft (9); The movable element (6) is rotatably mounted on the frame (1) and configured to engage the clutch (4) in response to rotation of the operating shaft (9) so that the clutch (4) moves in the opposite direction and disengages from the actuator (5).
2. The mechanical anti-pumping device for a circuit breaker according to claim 1, characterized in that, The closing push plate (3) is provided with a first pivot (41) parallel to the closing half shaft (2) at a position offset from the closing half shaft (2), and the clutch (4) is rotatably connected to the first pivot (41).
3. The mechanical anti-pumping device for a circuit breaker according to claim 1 or 2, characterized in that, The closing push plate (3) can rotate around the closing half shaft (2) to drive the clutch (4). The closing push plate (3) is connected to a first biasing member (33), which is configured to apply a force to the closing push plate (3) to reverse it and reset it.
4. The mechanical anti-pumping device for a circuit breaker according to claim 1, characterized in that, The clutch (4) is connected to a second biasing member (40), which is configured such that after the clutch (4) is driven away from the actuator (5) by the moving member (6), the clutch (4) is driven back by the second biasing member (40).
5. The mechanical anti-pumping device for a circuit breaker according to claim 1, characterized in that, The movable member (6) is rotatable about a second pivot (60) connected to the frame (1) to engage the clutch (4). The movable member (6) is connected to a third biasing member configured to apply a force to the movable member (6) to reverse it and reset it.
6. The mechanical anti-pumping device for a circuit breaker according to claim 1, characterized in that, The mechanical anti-jump device includes a change pin (7) that is responsive to the rotation of the operating shaft (9) relative to the frame (1) and drives the movable part (6) to engage the clutch (4).
7. The mechanical anti-pumping device for a circuit breaker according to claim 6, characterized in that, The circuit breaker includes a main shaft (8) rotatably connected to the frame (1) and a half shaft (71) connected to the frame (1) parallel to the main shaft (8). The half shaft (71) is pivotally connected to a first link (70), and the main shaft (8) is pivotally connected to a second link (72). The first link (70) and the second link (72) are each pivotally connected to the changeover pin (7).
8. The mechanical anti-pumping device for a circuit breaker according to claim 1, characterized in that, The clutch (4) has a spaced-apart first engagement portion (42) and second engagement portion (43), wherein the clutch (4) is configured such that during engagement of the actuator (5) by the first engagement portion (42), the second engagement portion (43) avoids each other from the movable member (6), and during engagement of the clutch (4) by the movable member (6) in response to rotation of the operating shaft (9), the movable member (6) abuts against the second engagement portion (43) and pushes the clutch (4) to move in the opposite direction.
9. The mechanical anti-pumping device for a circuit breaker according to claim 8, characterized in that, The second engagement portion (43) of the clutch (4) is constructed with an inclined surface, and the end of the movable member (6) near the clutch (4) can slide along the inclined surface to avoid each other.
10. A circuit breaker, comprising: Rack (1); The closing half shaft (2) is rotatably connected to the frame (1); The operating shaft (9) is rotatably connected to the frame (1). Energy storage mechanism, connected to the operating shaft (9); The closing half-shaft (2) can lock the operating shaft (9) to limit the energy storage mechanism from releasing energy; The circuit breaker is characterized in that it further includes a mechanical anti-pumping device, wherein the mechanical anti-pumping device is the mechanical anti-pumping device according to any one of claims 1 to 9.