A new spring operating mechanism for circuit breaker

Abstract

The utility model discloses a novel spring operating mechanism for circuit breaker relates to circuit breaker technical field. The utility model discloses a mechanism side plate, energy storage transmission device, closing device and closing keeping device are fixedly connected with energy storage motor to one side of mechanism side plate, and the utility model contains electric energy storage, electric closing and opening, energy storage state indication, closing and opening state indication, mechanical counter, energy storage position travel switch, manual energy storage and the like function, and the mechanism is integral type structure, can be as independent module and be fixed on circuit breaker frame, and the mechanism designs the unique closing keeping device: the reset spring of opening and closing buckle plate is the help opening and closing buckle plate tripping, and after circuit breaker opening and closing to place, circuit breaker main shaft drives opening and closing buckle plate to return to the buckle position, prepares for the next closing, and this structure makes the opening and closing tripping force small and the phenomenon of " refusal to open and close " of opening and closing half shaft opening and circuit breaker main shaft not rotating not easy to take place.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, and in particular relates to a novel spring operating mechanism for circuit breakers. Background Technology

[0002] Currently, the existing spring-operated mechanism energy storage clutch devices generally fall into the following categories:

[0003] One type has a drive wheel and a driven wheel coaxial with the energy storage shaft. The drive wheel is loosely fitted onto the energy storage shaft, and the driven wheel is connected to the energy storage shaft by a key. This type of clutch device is technologically mature and widely used. However, it transmits the stored torque through components such as the drive wheel, driven wheel, and top plate, resulting in a large number of components and a large space occupation. Another type involves a small gear in the energy storage transmission system driving a large gear and the energy storage shaft to rotate during energy storage. When energy storage is complete, the small gear in the energy storage transmission is axially pushed open, disengaging the gear transmission and achieving "separation" of the energy storage transmission. This clutch structure is relatively simple, but the axial pushing force required to push the small gear open axially at the moment of energy storage completion is relatively large, and reliability is affected, especially after mechanical wear. Therefore, this mechanism is rarely used in the market. A third type is an overrunning clutch designed on the crankshaft, consisting of gears, an energy storage shaft, and a cam. This clutch structure is characterized by its simple structure, fewer parts, and small space occupation. However, its disadvantages include high precision machining of components and higher cost.

[0004] Currently, the existing spring-operated closing holding structure involves the tripping plate remaining in the holding position under the action of the return spring. After closing, the tripping plate "engages" the circuit breaker main shaft in the closed position. When the tripping electromagnet on the operating mechanism receives a tripping command, it is energized and opens the tripping half-shaft, causing the circuit breaker main shaft to trip under the force of the tripping spring. The characteristic of this structure is that the engagement force on the circuit breaker tripping half-shaft becomes unstable due to accumulated errors. If the engagement force is too large, the tripping force will be too large, affecting the reliability of the tripping. If the engagement force is too small, the component of the engagement force will be less than the force of the tripping plate's return spring and the frictional resistance. During the tripping operation, after the tripping half-shaft opens, the circuit breaker main shaft cannot rotate, resulting in a "refusal to trip" phenomenon.

[0005] To address these issues, we provide a novel spring-operated mechanism for circuit breakers. Utility Model Content

[0006] The purpose of this utility model is to provide a novel spring operating mechanism for circuit breakers. By cooperating with an energy storage transmission device, a closing device, and a closing holding device, it solves the problems of complex structure and insufficient reliability of the energy storage clutch device in the existing spring operating mechanism, as well as the unstable tripping force and easy "refusal to open" of the closing holding device.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0008] This utility model discloses a novel spring operating mechanism for circuit breakers, comprising a mechanism side plate, an energy storage transmission device, a closing device, and a closing holding device. An energy storage motor is fixedly connected to one side of the mechanism side plate. The energy storage transmission device includes a cam, a pinion, a semi-circular gear, an energy storage shaft, a first roller, and an energy storage holding plate. One side of the cam is movably connected to the mechanism side plate via a rotating shaft. A one-way bearing is fitted inside the inner cavity of the pinion, and one side of the pinion is fitted to the output end of the energy storage motor via the one-way bearing. The semi-circular gear is fixed to the surface of the energy storage shaft via a key connection. One side of the first roller is fixed to one side of the surface of the semi-circular gear. The energy storage holding plate is disposed on one side of the mechanism side plate. The closing device includes a first return spring and a closing electromagnet. One side of the first return spring is fixedly connected to the mechanism side plate, and the other side of the first return spring is fixedly connected to the energy storage holding plate. The closing electromagnet is disposed on one side of the top of the mechanism side plate. When in operation, the small gear is the driving gear, equipped with a one-way bearing, and is mounted on the output shaft of the energy storage motor. The large semi-circular gear is the driven gear, fixed to the energy storage shaft via a key connection and rotates together with the energy storage shaft. During energy storage operation, the output shaft of the energy storage motor drives the small gear to rotate via the one-way bearing. The small gear drives the large semi-circular gear and the energy storage shaft to rotate. After rotating approximately 180 degrees, the energy storage is completed. The first roller on the large semi-circular gear is held in place by the energy storage retaining plate, and the cam is locked in the energy storage position. The gear has only a large semicircular tooth. At this time, the gear pair automatically "disengages". When the closing command is received, the closing electromagnet is activated, the energy storage holding plate is opened, and the closing spring (connected to this utility model but not included in this utility model) releases energy, driving the energy storage shaft, the large semicircular tooth gear, and the cam to rotate about 180 degrees, driving the circuit breaker to close. After the closing spring releases energy, the large semicircular tooth gear automatically meshes with the small gear, and the energy storage holding plate is reset under the action of the first reset spring, preparing for the next spring energy storage.

[0009] To solve the problem of interference that easily occurs when discontinuous gears mesh at random positions, the unique tooth profile design of the pinion enables the semi-circular toothed large gear to reliably mesh with the pinion at random positions. To solve the problem of collision and wear when the pinion and the semi-circular toothed large gear engage, the gear tooth surface is hardened. At the same time, the design allows the semi-circular toothed large gear to engage with the pinion at a lower speed.

[0010] The present invention is further configured such that the closing holding device includes a small latch plate, a sector plate, a second return spring, a tripping half-shaft, and a tripping electromagnet. The small latch plate is mounted on the surface of the sector plate. One side of the sector plate is movably connected to the mechanism side plate via a rotating shaft. A second return spring is fixedly connected to one side of the sector plate. One side of the small latch plate is movably connected to the sector plate via a third return spring. The tripping half-shaft is located at the top of the mechanism side plate. One side of the tripping electromagnet is fixedly connected to the mechanism side plate. The small latch plate is mounted on the sector plate and can rotate on the sector plate under the action of the third return spring. During the closing action, the circuit breaker main shaft rotates. After the closing is completed, the small latch plate... The reset plate "locks" the second roller on the main shaft of the circuit breaker, thus "locking" the main shaft and preventing it from rotating. The circuit breaker remains in the closed position. When the circuit breaker opens, the opening electromagnet activates, opening the opening half-shaft. Under the action of the second reset spring, the sector plate drives the small latch plate to rotate together, "unlocking" the closing holding device. The main shaft of the circuit breaker then rotates under the action of the opening spring, and the circuit breaker opens. Unlike conventional spring operating mechanisms, the second reset spring helps the sector plate unlock the small latch plate. During the circuit breaker opening process, the crank arm on the main shaft drives the sector plate to reset together with the small latch plate, and the opening half-shaft resets accordingly, preparing for the next closing operation.

[0011] The present invention is further configured such that a circuit breaker main shaft is provided on one side of the surface of the mechanism side plate, and a second roller is provided on one side of the surface of the circuit breaker main shaft. By movably connecting the circuit breaker main shaft to the mechanism side plate, the precise transmission between the operating mechanism and the circuit breaker is ensured. The setting of the second roller further optimizes the force transmission method, making the operation more stable and accurate, and helping to improve the opening and closing accuracy and reliability of the circuit breaker.

[0012] The present invention is further configured such that there are two mechanism side plates, which are symmetrically arranged. The use of two symmetrically arranged mechanism side plates makes the operating mechanism more balanced in mechanical performance. This symmetrical structure helps to evenly distribute the force, reduce local stress concentration, and thus improve the overall strength and durability of the mechanism.

[0013] The present invention is further configured such that the side plates of the mechanism form a clamp-type structure, and side plate support rods are fixedly connected between the side plates of the mechanism. The two side plates of the mechanism are fixed by five side plate support rods. The clamp-type structure provides a sturdy frame for the operating mechanism, enhancing the overall rigidity and stability of the mechanism. The side plate support rods not only connect the two side plates of the mechanism, but also further strengthen the strength of the structure, enabling it to withstand greater external forces and impacts.

[0014] The present invention is further configured such that the energy storage retaining plate is movably connected to the side plate of the mechanism via a pin, and the first return spring is a tension spring. The energy storage retaining plate is movably connected to the side plate of the mechanism via a pin, so that the energy storage retaining plate can rotate flexibly during energy storage and release, ensuring reliable maintenance and timely release of the energy storage state. Using a tension spring as the first return spring can provide a stable return force, ensuring that the energy storage retaining plate can quickly reset after the closing electromagnet is activated, preparing for the next energy storage.

[0015] This invention is further configured such that the snap-fit ​​surface between the small snap plate and the sector plate is an arc-shaped contact surface. This arc-shaped contact surface design increases the contact area between the small snap plate and the sector plate, making the snap-fit ​​tighter and more stable. This design helps prevent accidental disengagement during operation, improving the safety and reliability of the circuit breaker.

[0016] The present invention has the following beneficial effects.

[0017] 1. This utility model includes functions such as electric energy storage, electric closing and opening, energy storage status indication, closing and opening status indication, mechanical counter, energy storage position limit switch, and manual energy storage. The mechanism is an integral structure with a clamp-type frame, which can be fixed on the circuit breaker frame as an independent module. The energy storage transmission is a single-stage gear transmission pair. A simple energy storage positioning "clutch" device is designed: the unique tooth profile design solves the problem of interference when non-continuous gears mesh randomly, effectively enabling the energy storage transmission gear pair to automatically "disengage" when energy storage is in place, and automatically "engage" after the closing spring energy is released.

[0018] 2. This utility model is designed with a unique closing holding device: the reset spring of the opening buckle plate helps the opening buckle plate to release. After the circuit breaker is opened, the main shaft of the circuit breaker drives the opening buckle plate back to the latching position, preparing for the next closing. This structure makes the opening release force small and is less likely to cause the "refusal to open" phenomenon where the main shaft of the circuit breaker cannot rotate after the opening half shaft is opened. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a perspective view of a novel spring-operated mechanism for circuit breakers.

[0021] Figure 2 This is a schematic diagram of energy storage transmission and energy storage retention in a new type of spring operating mechanism for circuit breakers.

[0022] Figure 3 This is a structural diagram of the energy storage transmission "clutch" in a spring operating mechanism for a novel circuit breaker.

[0023] Figure 4 This is a schematic diagram of the closed and open states in a new type of spring operating mechanism for circuit breakers.

[0024] In the attached diagram: 1. Mechanism side plate; 2. Side plate support rod; 3. Energy storage motor; 4. Cam; 5. Small gear; 6. Semi-circular toothed large gear; 7. Energy storage shaft; 8. First roller; 9. Energy storage holding plate; 10. First return spring; 11. Closing electromagnet; 12. Circuit breaker main shaft; 13. Second roller; 14. Small plate; 15. Sector plate; 16. Second return spring; 17. Opening half shaft; 18. Opening electromagnet. Detailed Implementation

[0025] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example 1

[0027] Please see Figures 1-4 This utility model relates to a novel spring operating mechanism for circuit breakers, comprising a mechanism side plate 1, an energy storage transmission device, a closing device, and a closing holding device. An energy storage motor 3 is fixedly connected to one side of the mechanism side plate 1. The energy storage transmission device includes a cam 4, a pinion 5, a semi-circular gear 6, an energy storage shaft 7, a first roller 8, and an energy storage holding plate 9. One side of the cam 4 is movably connected to the mechanism side plate 1 via a rotating shaft. A one-way bearing is fitted inside the inner cavity of the pinion 5, and one side of the pinion 5 is fitted onto the energy storage motor 3 via the one-way bearing. At the output end of the power motor 3, a semi-circular gear 6 is fixed to the surface of the energy storage shaft 7 via a key connection. One side of the first roller 8 is fixed to one side of the surface of the semi-circular gear 6. The energy storage holding plate 9 is disposed on one side of the surface of the mechanism side plate 1. The closing device includes a first reset spring 10 and a closing electromagnet 11. One side of the first reset spring 10 is fixedly connected to the mechanism side plate 1, and the other side of the first reset spring 10 is fixedly connected to the energy storage holding plate 9. The closing electromagnet 11 is disposed on one side of the top of the mechanism side plate 1.

[0028] Specifically: During energy storage, the small gear 5 is the driving gear, equipped with a one-way bearing, and is mounted on the output shaft of the energy storage motor 3. The semi-circular gear 6 is the driven gear, fixed to the energy storage shaft 7 via a key connection and rotates together with the energy storage shaft 7. During energy storage operation, the output shaft of the energy storage motor 3 drives the small gear 5 to rotate via the one-way bearing. The small gear 5 drives the semi-circular gear 6 and the energy storage shaft 7 to rotate. After rotating approximately 180 degrees, the energy storage is completed. The first roller 8 on the semi-circular gear 6 is held in place by the energy storage retaining plate 9, and the cam 4 is locked in the energy storage position. The large circumferential gear 6 has only a large semicircular tooth. At this time, the gear pair automatically "disengages". When the closing command is received, the closing electromagnet 11 is activated, the energy storage holding plate 9 is opened, and the closing spring is connected to this utility model. It is not included in the energy release of this utility model, which drives the energy storage shaft 7, the large semicircular gear 6, and the cam 4 to rotate about 180 degrees, driving the circuit breaker to close. After the closing spring releases energy, the large semicircular gear 6 automatically meshes with the small gear 5. The energy storage holding plate 9 is reset under the action of the first return spring 10, preparing for the next spring energy storage.

[0029] To solve the problem of interference that easily occurs when discontinuous gears mesh at random positions, the unique tooth profile design of the pinion 5 enables the semi-circular toothed gear 6 to reliably mesh with the pinion 5 at random positions. To solve the problem of collision and wear when the pinion 5 and the semi-circular toothed gear 6 engage, the gear tooth surface is hardened. At the same time, the design allows the semi-circular toothed gear 6 to engage with the pinion 5 at a lower speed.

[0030] Example 2

[0031] Please see Figures 1-4 Based on Embodiment 1, the closing holding device includes a small latch plate 14, a sector plate 15, a second return spring 16, a closing half-shaft 17, and a closing electromagnet 18. The small latch plate 14 is mounted on the surface of the sector plate 15. One side of the sector plate 15 is movably connected to the mechanism side plate 1 via a rotating shaft. The second return spring 16 is fixedly connected to one side of the sector plate 15. One side of the small latch plate 14 is movably connected to the sector plate 15 via a third return spring. The closing half-shaft 17 is located at the top of the surface of the mechanism side plate 1. One side of the closing electromagnet 18 is fixed to the mechanism side plate 1. The connection is as follows: a circuit breaker main shaft 12 is provided on one side of the surface of the mechanism side plate 1, and a second roller 13 is provided on one side of the surface of the circuit breaker main shaft 12. There are two mechanism side plates 1, which are symmetrically arranged and form a clamp-type structure. The mechanism side plates 1 are fixedly connected to each other by side plate support rods 2. The two mechanism side plates 1 are fixed by five side plate support rods 2. The energy storage retaining buckle plate 9 is movably connected to the mechanism side plate 1 through a pin. The first return spring 10 is a tension spring. The buckle surface of the small buckle plate 14 and the fan-shaped plate 15 is an arc-shaped contact surface.

[0032] Specifically: The small latch plate 14 is mounted on the sector plate 15 and can rotate on the sector plate 15 under the action of the third return spring. During the closing action, the circuit breaker main shaft 12 rotates. After the circuit breaker is in the closed position, the small latch plate 14 resets and "locks" the second roller 13 on the circuit breaker main shaft 12, thus "locking" the circuit breaker main shaft 12. The circuit breaker main shaft 12 cannot rotate, and the circuit breaker remains in the closed position. During the opening action, the opening electromagnet 18 is activated, opening the opening half shaft 17. Under the action of the second return spring 16, the sector plate 15 drives the small latch plate 14 to rotate together, the closing holding device is "unlocked," and the circuit breaker main shaft 12... The circuit breaker rotates under the action of the tripping spring, thus tripping the circuit breaker. Unlike conventional spring operating mechanisms, the second return spring 16 helps the sector plate 15 unlock the small latch plate 14. During the tripping process, the crank arm on the main shaft 12 drives the sector plate 15 to reset together with the small latch plate 14, and the tripping half shaft 17 resets accordingly, preparing for the next closing. By movably connecting the main shaft 12 of the circuit breaker to the side plate 1 of the mechanism, precise transmission between the operating mechanism and the circuit breaker is ensured. The setting of the second roller 13 further optimizes the force transmission method, making the operation more stable and accurate. This design helps improve the opening and closing accuracy and reliability of the circuit breaker. The use of two symmetrically arranged mechanism side plates 1 makes the operating mechanism more balanced in mechanical performance. This symmetrical structure helps to evenly distribute forces, reducing local stress concentration and thus improving the overall strength and durability of the mechanism. The clamp-type structure provides a robust frame for the operating mechanism, enhancing its overall rigidity and stability. The side plate support rods 2 not only connect the two mechanism side plates 1 but also further strengthen the structure, enabling it to withstand greater external forces and impacts. The energy storage retaining plate 9 is connected to the mechanism via a pin. The movable connection of the side plate 1 allows the energy storage holding plate 9 to rotate flexibly during energy storage and release, ensuring reliable maintenance and timely release of the energy storage state. The use of a tension spring as the first reset spring 10 provides a stable reset force, ensuring that the energy storage holding plate 9 can quickly reset after the closing electromagnet actuates 11, preparing for the next energy storage. The arc-shaped contact surface design increases the contact area between the small plate 14 and the sector plate 15, making the connection tighter and more stable. This design helps prevent accidental tripping during operation, improving the safety and reliability of the circuit breaker.

[0033] The working principle of this utility model is as follows: When the energy storage motor 3 is powered on, the output shaft drives the small gear 5 to rotate clockwise through the one-way bearing. The one-way bearing only allows transmission in the energy storage direction to prevent the energy storage motor 3 from reversing when releasing energy. The small gear 5 meshes with the half-circumferential teeth of the semi-circular gear 6, driving the energy storage shaft 7 and the cam 4 fixed on it to rotate synchronously, compressing the closing spring to store energy. When the energy storage shaft 7 rotates about 180 degrees, the first roller 8 on the semi-circular gear 6 rotates to align with the energy storage retaining plate 9 and is hooked and locked by the hook-like structure of the energy storage retaining plate 9. The cam 4 is then fixed, and the closing spring maintains the energy storage state. Since the semi-circular gear 6 only has teeth on the half-circumference, when the energy storage is in place, its toothless arc surface rotates to contact the small gear 5, and the gear pair automatically disengages. The energy storage motor 3 runs idle to avoid overload damage.

[0034] After receiving the command, the closing electromagnet 11 is energized and strikes the energy storage holding plate 9, causing it to rotate counterclockwise around the pin shaft. This overcomes the tension of the first reset spring 10, releasing the first roller 8. The closing spring releases energy, driving the energy storage shaft 7 to rotate counterclockwise by about 180 degrees. This drives the cam 4 to push the circuit breaker linkage mechanism, completing the closing operation. The semi-circular toothed large gear 6 resets with the energy storage shaft 7, and its semi-circular teeth re-mesh with the small gear 5. Due to the optimized tooth profile of the small gear, it can reliably mesh at any angle.

[0035] After the closing action is completed, the energy storage holding plate 9 is reset to the locked position under the tension of the first reset spring 10, waiting for the next energy storage.

[0036] When the circuit breaker is closed, the main shaft 12 rotates to the preset position, and the second roller 13 on its surface is hooked and locked by the small buckle 14 installed on the sector plate 15. The small buckle 14 is kept in the buckling state by the third reset spring, and the sector plate 15 is fixed to the side plate 1 of the mechanism by the rotating shaft, ensuring that the main shaft 12 of the circuit breaker cannot rotate and maintaining the closed state.

[0037] When the tripping electromagnet 18 is energized, it pushes the tripping half shaft 17 to unlock the sector plate 15. The second reset spring 16 pulls the sector plate 15 in the tripping direction, causing the small latch plate 14 to rotate and release the second roller 13. The circuit breaker main shaft 12 rotates under the action of the tripping spring, thus achieving tripping.

[0038] During the tripping process, the crank arm on the main shaft 12 of the circuit breaker pushes the sector plate 15 to rotate in the opposite direction, and the small latch plate 14 is reset under the action of the third reset spring. The tripping half shaft 17 returns to its original position synchronously, preparing for the next closing.

[0039] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to specific implementation methods. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A novel spring operating mechanism for circuit breakers, comprising a mechanism side plate (1), an energy storage transmission device, a closing device, and a closing holding device, characterized in that: An energy storage motor (3) is fixedly connected to one side of the mechanism side plate (1); The energy storage transmission device includes a cam (4), a pinion (5), a semi-circular gear (6), an energy storage shaft (7), a first roller (8), and an energy storage retaining plate (9). One side of the cam (4) is movably connected to the mechanism side plate (1) via a rotating shaft. The inner cavity of the pinion (5) is fitted with a one-way bearing. One side of the pinion (5) is fitted to the output end of the energy storage motor (3) via a one-way bearing. The semi-circular gear (6) is fixed to the surface of the energy storage shaft (7) via a key connection. One side of the first roller (8) is fixed to one side of the surface of the semi-circular gear (6). The energy storage retaining plate (9) is set on one side of the surface of the mechanism side plate (1). The closing device includes a first reset spring (10) and a closing electromagnet (11). One side of the first reset spring (10) is fixedly connected to the mechanism side plate (1), and the other side of the first reset spring (10) is fixedly connected to the energy storage holding buckle plate (9). The closing electromagnet (11) is located on one side of the top of the mechanism side plate (1).

2. The novel spring operating mechanism for a circuit breaker according to claim 1, characterized in that: The closing holding device includes a small latch plate (14), a sector plate (15), a second reset spring (16), a closing half shaft (17), and a closing electromagnet (18). The small latch plate (14) is installed on the surface of the sector plate (15). One side of the sector plate (15) is movably connected to the mechanism side plate (1) through a rotating shaft. The second reset spring (16) is fixedly connected to one side of the sector plate (15). One side of the small latch plate (14) is movably connected to the sector plate (15) through a third reset spring. The closing half shaft (17) is located at the top of the surface of the mechanism side plate (1). One side of the closing electromagnet (18) is fixedly connected to the mechanism side plate (1).

3. The novel spring operating mechanism for a circuit breaker according to claim 1, characterized in that: A circuit breaker spindle (12) is provided on one side of the surface of the mechanism side plate (1), and a second roller (13) is provided on one side of the surface of the circuit breaker spindle (12).

4. The novel spring operating mechanism for a circuit breaker according to claim 1, characterized in that: The number of the mechanism side plates (1) is two, and the mechanism side plates (1) are arranged symmetrically.

5. The novel spring operating mechanism for a circuit breaker according to claim 1, characterized in that: The mechanism side plates (1) form a clamp-type structure, and the mechanism side plates (1) are fixedly connected with side plate support rods (2). The two mechanism side plates (1) are fixed by five side plate support rods (2).

6. The novel spring operating mechanism for a circuit breaker according to claim 1, characterized in that: The energy storage retaining plate (9) is movably connected to the mechanism side plate (1) via a pin, and the first reset spring (10) is a tension spring.

7. A novel spring operating mechanism for a circuit breaker according to claim 2, characterized in that: The fastening surfaces of the small buckle plate (14) and the fan-shaped plate (15) are arc-shaped contact surfaces.

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