Clutch structure of electric operating mechanism for circuit breaker

Abstract

The present invention provides a clutch structure for an electric operating mechanism for a circuit breaker, comprising a gear, a star wheel, a push rod, and a top plate. The star wheel is coaxially arranged in the center hole of the gear, and push rods capable of reciprocating along the radial direction of the star wheel are sleeved on both sides of the star wheel; a spring is arranged inside the star wheel, and a stop pin is telescopically arranged at the other end of the spring, and both ends of the stop pin are fixed to the push rod; a plurality of stoppers matching the stop pin are annularly arranged on the outer edge of the center hole, and the stop pin can switch between the center hole and the stoppers; the top plate is arranged outside the gear and fixed in position. The present invention has a simple structure, does not occupy external space, has good consistency of movement, is more suitable for mass production, achieves clutching without increasing axial and radial dimensions, and has low manufacturing cost.

Description

Technical Field

[0001] The invention relates to a circuit breaker accessory, in particular to a clutch structure of an electric operating mechanism for a circuit breaker. Background Art

[0002] The circuit breaker is a key component in the power grid output, transformation, and distribution processes. When the circuit breaker is working, it can be opened and closed by manual operation or by electric operation. The electric operating mechanism is the core component for realizing the operation of the circuit breaker.

[0003] The operating force of a circuit breaker is generally large, and it is difficult for an independent motor to realize the electric operation function. Therefore, the electric operating mechanism is generally composed of a motor and a reduction mechanism. In this way, a circuit breaker equipped with an electric operating mechanism can realize both electric and manual functions. However, since both manual operation and electric operation require driving the circuit breaker main shaft to realize the corresponding functions, it is extremely inconvenient in actual use and has certain safety hazards. For example, during manual operation, in addition to overcoming the elastic force of the circuit breaker mechanism itself, it is also necessary to overcome the resistance of the reduction mechanism. During electric operation, the electric operating mechanism drives the circuit breaker to work. When the circuit breaker main shaft rotates to a specific position, the motor is powered off. The motor and the reduction mechanism cannot stop rotating immediately due to inertia, which will cause a certain impact on the circuit breaker, which may have a certain impact on the performance and mechanical life of the circuit breaker.

[0004] In order to solve the above problems, a clutch structure is added to the deceleration mechanism on the basis of the electric operating mechanism. The current clutch structure is large in size, requires a large space, has a complex structure and has many transmission relationships between various components, resulting in poor movement accuracy. Summary of the Invention

[0005] In response to the shortcomings of the prior art, the present invention provides a clutch structure for an electric operating mechanism for a circuit breaker, which achieves a clutch effect without changing the external dimensions, has a simple structure and accurate operation, has good connection consistency among various components, and has low manufacturing cost. The technical solution adopted by the present invention is:

[0006] A clutch structure of an electric operating mechanism for a circuit breaker comprises a gear, a star wheel, a push rod and a top plate. The star wheel is coaxially arranged in the center hole of the gear. Push rods capable of reciprocating along the radial direction of the star wheel are sleeved on both sides of the star wheel.

[0007] A spring is arranged inside the star wheel, and a stop pin is arranged at the other end of the spring, and both ends of the stop pin are fixed to the push rod;

[0008] The outer edge of the center hole is annularly provided with a plurality of stoppers matching the stop pin, and the stop pin can switch between the center hole and the stoppers;

[0009] The top plate is arranged on the outside of the gear and is fixed in position. When the spring is in a free state, the distance between the farthest end of the side surface of the push rod close to the top plate and the axis of the star wheel is greater than the minimum distance between the top plate and the axis of the star wheel, and the distance between the two ends of the side surface of the push rod close to the top plate and the axis of the star wheel is less than the minimum distance between the top plate and the axis of the star wheel.

[0010] Furthermore, a pin hole is arranged on the push rod, and the stop pin is fixed in the pin hole.

[0011] Furthermore, two step surfaces are symmetrically arranged on the outer circumference of the star wheel, an oblong hole is processed on the push rod, and the push rod is sleeved on the star wheel using the oblong hole, and the step surface is parallel to the inner wall of the oblong hole.

[0012] Furthermore, the end of the push rod away from the star wheel is configured as an asymmetric arc edge.

[0013] Furthermore, a groove is provided on the outer peripheral surface of the star wheel, and the spring is elastically arranged in the groove.

[0014] Furthermore, when the stop pin is pressed into the stopper by the spring, the gear rotates clockwise to drive the star wheel to rotate.

[0015] The advantages of the present invention are as follows: the spring inside the star wheel and the stop pin cooperate with the stop on the gear to drive the push rod to make reciprocating motion relative to the step surface of the main shaft, thereby achieving a clutch effect, realizing clutching without increasing the axial and radial dimensions, and without changing the external dimensions. It is not only small in size and precise and reliable in action, but also has good structural consistency, is more suitable for mass production, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an assembly diagram of the present invention.

[0017] Figure 2 It is a structural diagram of the present invention.

[0018] Figure 3 This is a structural diagram of the present invention with one side of the frame removed.

[0019] Figure 4 This is a structural diagram of the present invention without one side of the frame and the push rod.

[0020] Figure 5 It is a top view of the present invention.

[0021] In the figure: 1-gear, 2-star wheel, 3-spindle, 4-groove, 5-frame, 6-stop pin, 7-push rod, 8-top plate, 9-spring, 10-stop, 101-center hole, 301-step surface, 501-positioning hole, 701-oblong hole, 702-pin hole, 703-arc edge. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] Please see the attached Figure 1-5 The present invention provides a clutch structure of an electric operating mechanism for a circuit breaker. The entire structure is assembled in a frame 5, including a gear 1, a star wheel 2, a push rod 7, and a top plate 8. The star wheel 2 is coaxially arranged in the center hole 101 of the gear 1. A main shaft 3 is fixed through the star wheel 2. When the star wheel 2 rotates, the main shaft 3 is driven to rotate. Push rods 7 are sleeved on both sides of the star wheel 2 and can reciprocate along the radial direction of the star wheel 2. A positioning hole 501 for the main shaft 3 to penetrate is provided on the frame 5, and the main shaft 3 passes through the positioning hole 501.

[0024] A spring 9 is configured inside the star wheel 2, and a stop pin 6 is telescopically configured at the other end of the spring 9. Both ends of the stop pin 6 are fixed to the push rod 7. Specifically, the spring 9 is fixed to the side of the stop pin 6, and a push rod 7 is fixed to each end of the stop pin 6. A groove 4 is provided on the outer circumference of the star wheel 2, and the spring 9 is elastically configured in the groove 4. The groove 4 is used to hide the spring 9, that is, it does not need to occupy the external space of the star wheel 2. The stop pin 6 is parallel to the axis of the star wheel 2 and is located in the groove 4 of the star wheel 2.

[0025] Specifically, a pin hole 702 is arranged on the push rod 7, and the stop pin 6 is fixed in the pin hole 702; when the stop pin 6 moves, it drives the two push rods 7 at both ends to move synchronously; two step surfaces 301 are symmetrically arranged on the outer peripheral surface of the star wheel 2, and an oblong hole 701 is processed on the push rod 7. The push rod 7 is sleeved on the star wheel 2 using the oblong hole 701, and the step surface 301 is parallel to the inner wall of the oblong hole 701; in the process of the stop pin 6 driving the push rod 7 to move, the main shaft 3 slides relative to the push rod 7 in the oblong hole 701, and the step surface 301 slides with the inner wall of the oblong hole 701.

[0026] The outer edge of the center hole 101 is annularly provided with a plurality of stops 10 matching the stop pin 6, and the stop pin 6 can switch between the center hole 101 and the stop 10; in practice, the two ends of the stop 10 are asymmetric surfaces. When the stop pin 6 is pressed into the stop 10 by the spring 9, the stop pin 6 cannot slide out of the stop 10. At this time, the gear 1 rotates clockwise to drive the star wheel 2 to rotate.

[0027] The top plate 8 is arranged on the outside of the gear 1 and fixed on the frame 5, and the end of the push rod 7 away from the star wheel 2 is configured as an asymmetric arc edge 703; when the spring 9 is in a free state, the distance between the farthest end of the side of the push rod 7 close to the top plate 8 and the axis of the star wheel 2 is greater than the minimum distance between the top plate 8 and the axis of the star wheel 2, and the distance between the two ends of the side of the push rod 7 close to the top plate 8 and the axis of the star wheel 2 is less than the minimum distance between the top plate 8 and the axis of the star wheel 2.

[0028] Working principle:

[0029] Before the electric operating mechanism starts working, the stop pin 6 contacts the inner wall of the center hole 101 of the gear 1 under the thrust of the spring 9. When the gear 1 rotates clockwise, the stop pin 6 enters the stopper 10 under the thrust of the spring 9. At this time, the stopper 10 blocks the stop pin 6, and the gear 1 drives the star wheel 2 to rotate;

[0030] When the electric operating mechanism drives the main shaft 3 to a specific position, the main shaft 3 starts to rotate rapidly clockwise, thereby rotating the star wheel 2. The star wheel 2 drives the stop pin 6 to move smoothly in the center hole 101 and the stop 10 in the gear 1. At the same time, the push rod 7 rotates clockwise under the action of the stop pin 6.

[0031] When the push rod 7 rotates to a specific position, the arc edge 703 at the top of the push rod 7 contacts the top plate 8, and under the reaction force of the top plate 8, the push rod 7 moves toward the star wheel 2 along the line connecting the stop pin 6 and the center of the star wheel 2. At this time, the spring 9 is compressed until the stop pin 6 is separated from the stop 10 and enters the groove 4;

[0032] When the main shaft 3 rotates to a specific position and stops rotating, the push rod 7 is always in contact with the top plate 8, the stop pin 6 is in the groove 4 of the star wheel 2, and the radial direction does not exceed the maximum outer circle of the star wheel 2. At this time, the star wheel 2 and the main shaft 3 are both in a stationary state, and the gear 1 and the star wheel 2 no longer rotate synchronously, realizing the separation function; when the star wheel 2 and the main shaft 3 are both in a stationary state, if the electric operating mechanism is in a power-off state, the main shaft 3 can be manually rotated clockwise for manual operation.

[0033] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A clutch structure of an electric operating mechanism for a circuit breaker, comprising a gear (1), a star wheel (2), a push rod (7) and a top plate (8), characterized in that: The star wheel (2) is coaxially arranged in the center hole (101) of the gear (1), and push rods (7) capable of reciprocating along the radial direction of the star wheel (2) are sleeved on both sides of the star wheel (2); A spring (9) is arranged inside the star wheel (2), and a stop pin (6) is telescopically arranged at the other end of the spring (9), and both ends of the stop pin (6) are fixedly arranged with the push rod (7); The outer edge of the center hole (101) is annularly provided with a plurality of stoppers (10) matching the stop pin (6), and the stop pin (6) is capable of switching between the center hole (101) and the stoppers (10); Two step surfaces (301) are symmetrically arranged on the outer circumference of the star wheel (2), an oblong hole (701) is processed on the push rod (7), and the push rod (7) is sleeved on the star wheel (2) by using the oblong hole (701), and the step surface (301) is parallel to the inner wall of the oblong hole (701); The top plate (8) is arranged outside the gear (1) and is fixed in position. When the spring (9) is in a free state, the distance between the farthest end of the side surface of the push rod (7) close to the top plate (8) and the axis of the star wheel (2) is greater than the minimum distance between the top plate (8) and the axis of the star wheel (2), and the distance between the two ends of the side surface of the push rod (7) close to the top plate (8) and the axis of the star wheel (2) is less than the minimum distance between the top plate (8) and the axis of the star wheel (2).

2. The clutch structure of the electric operating mechanism for a circuit breaker according to claim 1, characterized in that: The push rod (7) is provided with a pin hole (702), and the stop pin (6) is fixed in the pin hole (702).

3. The clutch structure of the electric operating mechanism for a circuit breaker according to claim 1, characterized in that: One end of the push rod (7) away from the star wheel (2) is configured as an asymmetric arc edge (703).

4. The clutch structure of the electric operating mechanism for a circuit breaker according to claim 1, characterized in that: A groove (4) is provided on the outer peripheral surface of the star wheel (2), and the spring (9) is elastically arranged in the groove (4).

5. The clutch structure of the electric operating mechanism for a circuit breaker according to claim 1, characterized in that: When the stop pin (6) is pressed into the stopper (10) by the spring (9), the gear (1) rotates clockwise to drive the star wheel (2) to rotate.

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