Transmission structure and servo vacuum circuit breaker using the same

Abstract

The utility model relates to a kind of transmission structure and the servo vacuum circuit breaker using the structure, belong to the technical field of high-voltage switch power transmission equipment.Its transmission structure is: connecting plate is equipped in spring cylinder, one end of connecting plate is connected spring seat, and the other end is stretched out spring cylinder and is connected with crank arm;Overtravel spring is equipped in spring cylinder, one end of overtravel spring is supported on the top surface of spring cylinder, and the other end is supported on spring seat;The outer circumference of part of crank arm is cam surface, and other part is crank arm end face;Limiting block is equipped in the side surface of crank arm, when opening position, overtravel spring releases pressure, and crank arm end face is seated on the upper surface of limiting block;When closing position, overtravel spring is compressed, and cam surface is contacted with the inclined surface of the lower surface of limiting block limit.The transmission structure can let overtravel spring intervene when circuit breaker closes, ensure the positive pressure between vacuum bubble contact, and simultaneously realize rigid transmission when opening, ensure that servo motor can accurately control the action of vacuum circuit breaker.

Description

Technical Field

[0001] This utility model relates to a transmission structure and a servo vacuum circuit breaker using the structure, belonging to the technical field of high-voltage switchgear. Background Technology

[0002] Traditional operating mechanisms, such as electromagnetic operating mechanisms and spring-loaded rubbing mechanisms, have many drawbacks, including poor inherent mechanical stability, sticking and failure to move after long-term static operation, and changes in characteristics as the mechanism ages. Traditional mechanisms are particularly inadequate in meeting the demands of intelligent control and maintenance of modern switchgear. With the development of servo motor technology, a new type of transmission mechanism has emerged in the field of high-voltage switchgear.

[0003] In traditional vacuum circuit breakers, the overtravel spring is located between the drive mechanism and the moving contact of the vacuum interrupter. During transmission, the overtravel spring undergoes a certain degree of compression and release, causing vibration of the moving contact. For ordinary vacuum circuit breakers, this effect is negligible. However, for servo motor-controlled vacuum circuit breakers, the emphasis is on real-time feedback and correction of motor speed to achieve accurate control of the moving contact. In such cases, the effect of the overtravel spring is unacceptable. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a transmission structure and a servo vacuum circuit breaker using the structure. The transmission structure places the overtravel spring externally on the cam transmission device, which is equivalent to the two transmission devices working at the same time: during the opening and closing process, the cam motion connection ensures the rigidity of the transmission; when in the closed position, the overtravel spring is used to maintain the pressure between the moving and stationary contacts of the vacuum interrupter, ensuring the normal operation of the circuit breaker.

[0005] To solve the above problems, the specific technical solution of this utility model is as follows: A transmission structure, wherein a connecting plate is provided inside a spring cylinder, one end of the connecting plate is connected to a spring seat, and the other end extends out of the spring cylinder and is connected to a crank arm; an overtravel spring is provided inside the spring cylinder, one end of the overtravel spring is supported on the top surface of the spring cylinder, and the other end is supported on the spring seat; a portion of the outer circumference of the crank arm is a cam surface, and the other portion is the crank arm end face; a limit block is provided on the side of the crank arm, wherein when the circuit is open, the overtravel spring releases pressure, and the crank arm end face sits on the upper surface of the limit block; when the circuit is closed, the overtravel spring is compressed, and the cam surface contacts the inclined surface of the lower surface of the limit block for limiting.

[0006] The cam surface of the crank arm is a symmetrical double-ear structure. A coaxial crank arm shaft is provided on the outer surface of the two ear pieces. The crank arm shaft is connected to an external mechanism to form the rotation center of the crank arm. A coaxial crank arm hole is provided on the side of the crank arm shaft. The connecting plate is located between the two ear pieces and is connected to the crank arm hole through a pin.

[0007] The spring cylinder consists of a guide cylinder and an end face; the guide cylinder is a cylindrical structure and is set perpendicular to the end face, with an elongated hole at the center of the end face, through which the connecting plate passes.

[0008] The spring seat includes a sleeve, connecting lugs, and a guide platform; the sleeve has a through hole, and connecting lugs are symmetrically arranged at the lower end of the sleeve. The connecting lugs are provided with pin holes, and the connecting plate passes through the through hole and engages with the pin hole through a pin shaft; a guide platform is provided at the connection between the sleeve and the connecting lugs, and the guide platform slides with the inner wall of the guide cylinder; the overtravel spring is supported on the guide platform.

[0009] A servo vacuum circuit breaker with a transmission structure is provided, in which the connecting lugs connect to the connecting plate and the vacuum interrupter at the same time; the crank arm shaft is connected to the output shaft of an external servo motor.

[0010] The transmission structure described in this application is applied in a servo vacuum circuit breaker. When the circuit breaker is closed, the overtravel spring acts between the moving contact of the vacuum interrupter and the cam, providing the closing holding force between the contacts and ensuring the positive pressure between the vacuum bulb contacts. At the same time, it achieves rigid transmission when the circuit breaker is open, ensuring that the servo motor can accurately control the operation of the vacuum circuit breaker. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the transmission structure.

[0012] Figure 2 This is a 3D view of the crank arm.

[0013] Figure 3 This is a 3D view of the crank arm from another direction.

[0014] Figure 4 This is a top view of the spring cylinder.

[0015] Figure 5 for Figure 4 AA sectional view.

[0016] Figure 6 This is a 3D view of the spring seat.

[0017] Figure 7 This is a three-dimensional view of the spring seat from another direction.

[0018] Figure 8 This is a servo vacuum circuit breaker with the drive structure described in this application.

[0019] Figure 9 The diagram shows the working state steps of the transmission structure, where a is the open position, b is the intermediate position, c is the closed position 1, and d is the closed position 2. Detailed Implementation

[0020] like Figures 1 to 3As shown, a transmission structure includes a connecting plate 5 inside a spring cylinder 2. One end of the connecting plate 5 is connected to a spring seat 4, and the other end extends out of the spring cylinder 2 and connects to a crank arm 1. An overtravel spring 3 is provided inside the spring cylinder 2. One end of the overtravel spring 3 is supported on the top surface of the spring cylinder 2, and the other end is supported on the spring seat 4. A portion of the outer circumference of the crank arm 1 is a cam surface 15, and the other portion is a crank arm end face 13. A limit block 6 is provided on the side of the crank arm 1. When the circuit is open, the overtravel spring 3 releases pressure, and the crank arm end face 13 sits on the upper surface of the limit block 6. When the circuit is closed, the overtravel spring 3 is compressed, and the cam surface 15 contacts the inclined surface of the lower surface of the limit block 6 for limiting.

[0021] like Figure 2 and Figure 3 As shown, the cam surface 15 of the crank arm 1 is a symmetrical double-ear structure. A coaxial crank arm shaft 11 is provided on the outer surface of the two ear pieces. The crank arm shaft 11 is connected to an external mechanism to form the rotation center of the crank arm 1. A coaxial crank arm hole 12 is provided on the side of the crank arm shaft 11. The connecting plate 5 is located between the two ear pieces and is connected to the crank arm hole 12 through a pin.

[0022] like Figure 4 and Figure 5 As shown, the spring cylinder 2 is composed of a guide cylinder 23 and an end face 22; the guide cylinder 23 is a cylindrical structure and is set perpendicular to the end face 22, and an elongated hole 21 is provided at the center of the end face 22, through which the connecting plate 5 passes.

[0023] like Figure 6 and Figure 7 As shown, the spring seat 4 includes a sleeve 45, a connecting lug 44, and a guide platform 41; the sleeve 45 has a through hole 43 inside, and the connecting lug 44 is symmetrically arranged at the lower end of the sleeve 45. The connecting lug 44 is provided with a pin hole 42. The connecting plate 5 passes through the through hole and cooperates with the pin hole 42 through the pin shaft; a guide platform 41 is provided at the connection between the sleeve 45 and the connecting lug 44, and the guide platform 41 slides with the inner wall of the guide cylinder 23; the overtravel spring 3 is supported on the guide platform 41.

[0024] like Figure 8 As shown, a servo vacuum circuit breaker with a transmission structure is provided, in which the connecting lug 44 connects to the connecting plate 5 and the vacuum interrupter chamber at the same time; the crank arm 1's crank shaft 11 is connected to the output shaft of an external servo motor.

[0025] like Figure 9As shown, the circuit breaker closing position is the open position of the circuit breaker. At this time, the crank arm end face 13 of the crank arm 1 rests on the upper surface of the limit block 6. The stepper motor starts, and the crank arm 1 rotates clockwise around the crank arm shaft 11. The cam structure 15 pushes the spring cylinder 2 downward, and at the same time drives the connecting plate 5 downward. The spring 3 is compressed and stored, and the connecting plate 5 reaches the middle position. The stepper motor continues to rotate and reaches the maximum diameter position of the cam structure 15. The spring 3 is compressed to its maximum value, and the connecting plate 5 reaches the closing position 1. The cam structure 15 continues to rotate, and the overtravel spring 3 exerts force, causing the cam structure 15 to abut against the lower inclined surface of the limit block 6. At the same time, the connecting plate 5 reaches the closing position 2. The closing positions 1 and 2 are the range of the circuit breaker closing stroke to match the circuit breaker error and the stroke loss caused by contact burnout.

[0026] Circuit breaker tripping: After receiving the tripping command, the servo motor drives the crank arm 1 to rotate counterclockwise, and the connecting plate 5 drives the load to trip until the crank arm end face 13 contacts the upper end face of the limit block 6, completing the crank arm self-locking and the tripping is completed.

Claims

1. A transmission arrangement, characterized by: A connecting plate (5) is provided inside the spring cylinder (2). One end of the connecting plate (5) is connected to the spring seat (4), and the other end extends out of the spring cylinder (2) and is connected to the crank arm (1). An overtravel spring (3) is provided inside the spring cylinder (2). One end of the overtravel spring (3) is supported on the top surface of the spring cylinder (2), and the other end is supported on the spring seat (4). A portion of the outer circumference of the crank arm (1) is a cam surface (15), and the other portion is the crank arm end face (13). A limit block (6) is provided on the side of the crank arm (1). When the circuit is open, the overtravel spring (3) releases pressure, and the crank arm end face (13) sits on the upper surface of the limit block (6). When the circuit is closed, the overtravel spring (3) is compressed, and the cam surface (15) contacts the inclined surface of the lower surface of the limit block (6) for limit.

2. The transmission arrangement of claim 1, wherein: The cam surface (15) of the crank arm (1) is a symmetrical double-ear structure. A coaxial crank shaft (11) is provided on the outer surface of the two ear pieces. The crank shaft (11) is connected to the external mechanism to form the rotation center of the crank arm (1). A coaxial crank hole (12) is provided on the side of the crank shaft (11). The connecting plate (5) is located between the two ear pieces and is connected to the crank hole (12) through a pin.

3. The transmission arrangement of claim 2, wherein: The spring cylinder (2) consists of a guide cylinder (23) and an end face (22). The guide cylinder (23) is a cylindrical structure and is set perpendicular to the end face (22). An elongated hole (21) is provided at the center of the end face (22), and the connecting plate (5) passes through the elongated hole (21).

4. The transmission arrangement of claim 3, wherein: The spring seat (4) includes a sleeve (45), a connecting lug (44), and a guide plate (41); the sleeve (45) has a through hole (43), and the connecting lug (44) is symmetrically arranged at the lower end of the sleeve (45). The connecting lug (44) has a pin hole (42), and the connecting plate (5) passes through the through hole and cooperates with the pin hole (42) through the pin shaft; a guide plate (41) is provided at the connection between the sleeve (45) and the connecting lug (44), and the guide plate (41) slides with the inner wall of the guide cylinder (23); the overtravel spring (3) is supported on the guide plate (41).

5. A servo vacuum circuit breaker employing the transmission structure according to claim 4, characterized by: The connecting ear plate (44) is connected to the connecting plate (5) and the vacuum interrupter is connected at the same time; the crank arm shaft (11) of the crank arm (1) is connected to the output shaft of the external servo motor.

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