A mechanical locking self-holding transmission device and transmission method for high-voltage vacuum circuit breaker

Abstract

The present invention provides a high-voltage vacuum circuit breaker mechanical locking self-holding transmission device and transmission method, belonging to the technical field of high-voltage vacuum circuit breakers, comprising: a driving device; the output end of the driving device is connected to a driving crank arm; the end of the driving crank arm is connected to a pull rod; the pull rod is connected to an intermediate pull rod through a transmission arm; the intermediate pull rod is connected to a contact spring device, and the contact spring device is connected to a moving contact; an opening buffer for limiting the opening position and a closing buffer for limiting the closing position are provided within the rotation range of the driving crank arm. The device can realize the self-holding of the circuit breaker force, and can effectively suppress the bouncing of the vacuum circuit breaker when the movement stops, thereby improving the stability of the mechanical operation.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum high-voltage switches, and in particular relates to a mechanical locking self-holding transmission device and a transmission method for a high-voltage vacuum circuit breaker. Background Art

[0002] A vacuum high-voltage switch is a switchgear that uses vacuum as an insulating and arc-extinguishing medium. It is mainly used for power distribution and control of high-voltage power systems. The core component of a vacuum high-voltage switch is a vacuum interrupter, the interior of which is evacuated to a high vacuum state. When the circuit needs to be disconnected, the operating mechanism drives the moving contact and the static contact to separate. At the moment the contacts separate, the current forms an arc between the contacts. Since there is no gas inside the vacuum chamber, the electrons and ions in the arc cannot collide with the gas molecules, and thus the arc cannot be sustained. Therefore, the arc will quickly extinguish, disconnecting the circuit.

[0003] The power output of existing high-voltage circuit breakers generally relies on the energy released by springs or hydraulic springs to achieve opening and closing operations. However, due to the unreasonable design of the connecting components, the operation is not in place during the opening and closing process. Moreover, after the opening and closing is executed, due to insufficient self-holding force, the vacuum circuit breaker is prone to bounce when the movement stops, resulting in poor contact of the contacts and affecting the stability of the opening and closing process. Summary of the invention

[0004] The present invention provides a mechanical locking self-holding transmission device for a high-voltage vacuum circuit breaker, which can realize the self-holding of the circuit breaker force and effectively suppress the bouncing of the vacuum circuit breaker when the movement stops, thereby improving the stability of the mechanical operation.

[0005] The device comprises: a driving device; an output end of the driving device is connected to a driving crank arm; an end of the driving crank arm is connected to a pull rod; The pull rod is connected to the middle pull rod through the transmission arm; the middle pull rod is connected to the contact spring device, and the contact spring device is connected to the moving contact; An opening buffer for limiting the opening position and a closing buffer for limiting the closing position are arranged within the rotation range of the driving crank arm.

[0006] It should be further explained that the output shaft of the driving device is connected to the first end of the driving crank arm via a spline, and the driving device drives the driving crank arm to rotate.

[0007] It should be further explained that the second end of the driving crank arm is rotatably connected to the pull rod via an axle pin.

[0008] It should be further explained that the pull rod is provided with a straight section and an arc section; The first end of the circular arc segment is rotatably connected to the driving crank arm through an axle pin; the second end of the circular arc segment is connected to the first end of the straight segment; and the second end of the straight segment is connected to the transmission arm.

[0009] It should be further explained that the transmission arm is provided with a straight crank arm and an inner crank arm; the straight crank arm and the inner crank arm are rotationally connected through a transmission shaft.

[0010] It should be further explained that the inner crank arm and the middle pull rod are rotationally connected via an axle pin.

[0011] It should be further explained that it also includes: a base, and the opening buffer and the closing buffer are respectively fixed on the base; The closing buffer is arranged close to one side of the pull rod, and the opening buffer is arranged far away from the pull rod.

[0012] It should be further explained that it also includes: a support; a bearing is arranged on the support, and the transmission shaft is rotatably connected to the bearing.

[0013] The present application also provides a high-voltage vacuum circuit breaker mechanical locking self-holding transmission method, the method comprising: a closing operation; a driving device drives a driving crank arm to rotate, drives the crank arm and drives the pull rod to rotate in the direction of the closing buffer; The pull rod drives the middle pull rod to move upward through the transmission arm, so that the contact spring device moves upward synchronously; When the driving crank arm rotates to an angle greater than the preset closing angle with the horizontal position, the driving crank arm abuts against the closing buffer to close the moving contact and the stationary contact of the high-voltage vacuum circuit breaker. The spring compression of the contact spring device provides a holding force for the moving contact and the stationary contact to close.

[0014] It should be further explained that the method further includes: opening operation; The driving device drives the driving crank arm to rotate, drives the crank arm and drives the pull rod to rotate in the direction of the opening buffer; The pull rod drives the middle pull rod to move downward through the transmission arm, causing the contact spring device to move downward synchronously; When the driving crank arm rotates to an angle greater than a preset opening angle with the horizontal position, the driving crank arm abuts against the opening buffer, thereby separating the moving contact and the static contact of the high-voltage vacuum circuit breaker.

[0015] It can be seen from the above technical solutions that the present invention has the following advantages: The mechanical locking self-retaining transmission device of the high-voltage vacuum circuit breaker provided in the present application connects the driving device and the first end of the driving crank arm through a spline to ensure torque transmission capacity and reduce the problem of loose connection. The driving crank arm is connected to the pull rod, which can adapt to the angle changes in movement and bear the force evenly; the design of the straight section and the arc section of the pull rod makes the force transmission smoother and smoother, and can better adapt to the layout of the surrounding components, optimize the force transmission path, reduce space occupancy, and ensure the execution of the circuit breaker opening and closing actions. The opening buffer and closing buffer of the device absorb excess kinetic energy when the opening and closing are in place, respectively, to protect the driving crank arm, pull rod, intermediate pull rod and other transmission components and contact spring devices, etc., reduce mechanical wear and component damage, and improve the safety and reliability of equipment operation.

[0016] Moreover, the buffer's limiting function when the switch is in place forms a reliable mechanical locking self-holding structure. After the closing or opening action is completed, it can effectively resist external interference, keep the contacts stable in the corresponding position, avoid misoperation, and ensure stable power supply and safe operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of a mechanical locking self-holding transmission device for a high-voltage vacuum circuit breaker; Figure 2 This is a schematic diagram of the closing state; Figure 3 This is a schematic diagram of the open state. DETAILED DESCRIPTION

[0019] The high-voltage vacuum circuit breaker mechanical locking self-holding transmission device provided in the present application mainly realizes the self-holding of the circuit breaker force, and can effectively suppress the bouncing of the vacuum circuit breaker when the movement stops, thereby improving the stability of the mechanical operation.

[0020] The specific structure and implementation process of the mechanical locking self-holding transmission device of the vacuum circuit breaker are described in detail below. For the purpose of explanation rather than limitation, specific details such as specific system structures and technologies are proposed to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details.

[0021] It should be understood that when used in the present specification, the term "includes" indicates the presence of the described features, integral bodies, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or their collections. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0022] It should be understood that the "one or more" mentioned in this application refers to one, two or more than two, and the "multiple" mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B. The "and / or" in this article is just a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0023] In order to clearly describe the technical solution of the present application, the words "first", "second" and the like are used to distinguish the same or similar items with substantially the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit the difference.

[0024] The phrases such as "one embodiment" or "some embodiments" described in the present application mean that the specific features, structures or characteristics described in the embodiment are included in one or more embodiments of the present application. Therefore, the phrases such as "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments" etc. that appear in different places in the present application do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 The figure shows a schematic diagram of a mechanical locking self-holding transmission device for a high-voltage vacuum circuit breaker in a specific embodiment. The mechanical locking self-holding transmission device for a high-voltage vacuum circuit breaker comprises: a driving device 1; the driving device 1 can use a motor to drive the opening and closing of the high-voltage vacuum circuit breaker.

[0027] In some embodiments, the output shaft of the driving device 1 is connected to the first end of the driving crank arm 2 via a spline, and the driving device 1 drives the driving crank arm 2 to rotate. The second end of the driving crank arm 2 is rotatably connected to the pull rod 5 via a shaft pin.

[0028] The spline connection in this embodiment can transmit a larger torque, meet the larger driving force required for the opening and closing operation of the high-voltage vacuum circuit breaker, and can also ensure the centering of the driving device and the driving crank arm during connection, ensuring the accuracy and stability of the transmission.

[0029] The axle pin connection of this embodiment allows the pull rod to rotate relative to the driving crank arm, which can well adapt to the angle change during the transmission process. It can also make the pull rod evenly distributed at the connection part through the axle pin when the force is applied to the pull rod.

[0030] In this way, during the opening and closing operation of the circuit breaker, the movement trajectory of the pull rod is not a straight line. The axle pin connection allows the pull rod to move flexibly following the rotation of the driving crank arm, ensuring the smoothness of the transmission.

[0031] The end of the driving crank arm 2 of this embodiment is connected to a pull rod 5; the pull rod 5 is provided with a straight section 4 and an arc section 3; the first end of the arc section 3 is rotatably connected to the driving crank arm 2 through an axle pin; the second end of the arc section 3 is connected to the first end of the straight section 4; the second end of the straight section 4 is connected to the transmission arm.

[0032] It should be noted that the arc segment 3 of the pull rod is designed to meet the rotation requirements when connected to the driving crank arm, while the straight segment 4 is convenient for connecting to the transmission arm, ensuring that the entire transmission chain can smoothly transition between different components. The straight segment 4 and the arc segment 3 can make the force generated by the drive device more reasonably distributed and transmitted during the transmission process. This allows the pull rod to achieve effective force transmission in a limited space, which meets the requirements of the high-voltage vacuum circuit breaker for spatial layout.

[0033] The pull rod 5 of this embodiment is connected to the middle pull rod 6 through a transmission arm; the transmission arm is provided with a straight crank arm 10 and an inner crank arm 11; the straight crank arm 10 and the inner crank arm 11 are rotatably connected through a transmission shaft 12. The inner crank arm 11 is rotatably connected to the middle pull rod 6 through an axle pin.

[0034] Optionally, a bearing is provided on the support, and the transmission shaft 12 is rotatably connected to the bearing.

[0035] The intermediate pull rod 6 of this embodiment is connected to the contact spring device 7, and the contact spring device 7 is connected to the moving contact. The power generated by the driving device is gradually transmitted to the moving contact to realize the opening and closing operation of the high-voltage vacuum circuit breaker. The intermediate pull rod and the contact spring device play a role of buffering and regulating in the process of force transmission, ensuring that the moving contact can smoothly perform the opening and closing actions.

[0036] An opening buffer 8 for limiting the opening position and a closing buffer 9 for limiting the closing position are arranged within the rotation range of the driving crank arm 2 .

[0037] The device further comprises: a base, on which the opening buffer 8 and the closing buffer 9 are respectively fixed; the closing buffer 9 is arranged close to one side of the pull rod 5, and the opening buffer 8 is arranged away from the pull rod 5.

[0038] The opening buffer and closing buffer of this embodiment can absorb and buffer excess kinetic energy when the circuit breaker is in the opening and closing position, prevent excessive impact of mechanical parts due to inertia, and protect the drive device, crank arm, pull rod and other parts from damage. The opening buffer and closing buffer can make the opening and closing time of the circuit breaker more stable, meeting the requirements of the power system for the circuit breaker operation performance.

[0039] It can be seen that the mechanical locking self-holding transmission device of the high-voltage vacuum circuit breaker involved in the present application improves the stability of the circuit breaker opening and closing actions and reduces vibration and bouncing during operation.

[0040] The following provides a preferred implementation of the mechanical locking self-retaining transmission device provided by the present application, wherein the output shaft of the driving device and one end of the driving crank arm are connected via a spline.

[0041] When the driving device moves, it drives the driving crank arm to rotate around the axis of the driving device; the other end of the driving crank arm is connected to one end of the pull rod through an axle pin to achieve relative rotation between the two parts; the other end of the pull rod and the straight crank arm are connected to achieve rotational cooperation through an axle pin.

[0042] The straight crank arm and the transmission shaft are matched through splines. When the straight crank arm rotates, it drives the transmission shaft to rotate around its own axis; similarly, one end of the inner crank arm and the transmission shaft are matched with splines to achieve rotation around the axis of the transmission shaft.

[0043] The lower end of the intermediate pull rod of this embodiment is connected to the other end of the inner crank arm through an axle pin. When the inner crank arm rotates around the axis of the transmission shaft, it drives the intermediate pull rod to move up and down; the other end of the intermediate pull rod is connected to one end of the contact spring device through an axle pin. When the intermediate pull rod moves up and down, it drives the contact spring device to move up and down synchronously, so that the spring is compressed to provide contact holding force for the arc extinguishing chamber; the other end of the contact spring device is connected to one end of the moving contact 13 of the vacuum arc extinguishing chamber 15 through a thread to achieve synchronous up and down movement of the two components; and the static contact 14 of the vacuum arc extinguishing chamber 15 is fixedly connected to the circuit breaker tank. Through the connection of the above kinematic pairs, the rotation of the drive device drives the moving contact of the vacuum arc extinguishing chamber 15 to move up and down, realizing the opening and closing action of the circuit breaker.

[0044] It can be seen that after the switch is closed or opened, based on the connection relationship between the drive device 1, the drive arm 2, the pull rod 5, the intermediate pull rod 6 and the contact spring device 7, and the limiting effect of the opening buffer 8 and the closing buffer 9, the entire device forms a mechanical locking state. It can keep the circuit breaker stable in the closed or open position to prevent malfunctions caused by external interference or slight vibration. At the same time, the connection between the various components and the cooperation of the buffer ensure that the transmission device can reliably remain in the closed or open state, realizing the self-holding function. It ensures the stable operation of the circuit breaker in the power system.

[0045] The following is an embodiment of the mechanical locking and self-holding transmission method for high-voltage vacuum circuit breakers provided by the embodiments of the present disclosure. The device and the mechanical locking and self-holding transmission devices of the high-voltage vacuum circuit breakers in the above-mentioned embodiments belong to the same inventive concept. For details not fully described in the embodiment of the mechanical locking and self-holding transmission method for high-voltage vacuum circuit breakers, reference can be made to the embodiments of the mechanical locking and self-holding transmission devices of the above-mentioned high-voltage vacuum circuit breakers.

[0046] The method comprises: a closing operation; a driving device drives a driving crank arm to rotate, drives the crank arm and drives the pull rod 5 to rotate toward the closing buffer 9; The pull rod 5 drives the middle pull rod 6 to move upward through the transmission arm, so that the contact spring device moves upward synchronously; When the driving crank arm 2 rotates to an angle greater than the preset closing angle with the horizontal position, the driving crank arm 2 abuts against the closing buffer 9, thereby closing the moving contact and the stationary contact of the high-voltage vacuum circuit breaker. The spring compression of the contact spring device provides a holding force for the moving contact and the stationary contact to close.

[0047] The method also includes: opening operation; The driving device drives the driving crank arm to rotate, drives the crank arm and drives the pull rod 5 to rotate towards the opening buffer 8.

[0048] The pull rod 5 drives the middle pull rod 6 to move downward through the transmission arm, so that the contact spring device moves downward synchronously.

[0049] When the driving crank arm 2 rotates to an angle greater than a preset opening angle with the horizontal position, the driving crank arm 2 abuts against the opening buffer 8, thereby separating the moving contact and the static contact of the high-voltage vacuum circuit breaker.

[0050] like Figure 2 As shown, a specific implementation of the mechanical locking self-holding transmission method of the high-voltage vacuum circuit breaker is given below.

[0051] When the circuit breaker is in the closed state and the moving and static contacts of the arc extinguishing chamber are in the closed state, the angle between the driving arm and the horizontal position is A, A≥5°.

[0052] Considering that the driving crank arm has passed the horizontal axis position and the driving crank arm is in the dead point position on the same line with the hook pull rod, after the energy of the driving device is removed at this time, the driving crank arm will not rotate clockwise, realizing the self-locking and anti-reversal of the closing mechanism.

[0053] Under the action of the contact spring force, the driving crank arm will rotate counterclockwise under the action of the counterclockwise rotating torque M. If it is not stopped, the holding force of the contact spring device will be reduced, and even the moving and static contacts of the vacuum arc chamber 15 will be separated, resulting in incomplete closing. At this time, the closing buffer will intervene and prevent the entire device from rotating counterclockwise, so that the driving crank arm maintains its original position, the contact spring device force is self-retained, and the circuit breaker is always in the closed state, realizing the self-retention of the closing position and force.

[0054] like Figure 3 As shown, when the circuit breaker is in the open state and the moving and static contacts of the arc extinguishing chamber maintain a certain distance, the angle between the driving arm and the horizontal position is A', and A'≥5°.

[0055] Since the driving crank arm has passed the horizontal axis position, that is, it has passed the other dead point position where the driving crank arm and the hook pull rod are colinear, after the energy of the driving device is removed at this time, the driving crank arm will not rotate counterclockwise, thereby realizing the mechanical self-locking and anti-reversal of the opening switch. Under the self-closing force of the vacuum arc chamber 15, the driving crank arm is acted upon by the clockwise rotating torque M' and will rotate clockwise. If it is not stopped, it will cause the moving contact of the vacuum arc chamber 15 to move upward, shortening the distance between the moving contact and the static contact, resulting in inadequate opening of the switch. At this time, the intervention of the opening buffer will prevent the entire device from continuing to rotate clockwise, so that the driving crank arm maintains its original position unchanged, so that the circuit breaker is always in the opening state, thereby realizing the opening self-holding state.

[0056] During the opening and closing process of the high-voltage vacuum circuit breaker mechanical locking self-holding transmission device, in addition to achieving accurate positioning and firm retention of the opening and closing positions, the connection of the opening buffer 8 and the closing buffer 9 can also effectively mitigate the impact vibration when the opening and closing stops, reduce the large bounce, and make the mechanical movement smoother.

[0057] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mechanical locking self-holding transmission device for a high-voltage vacuum circuit breaker, characterized in that: include: A driving device (1); an output end of the driving device (1) is connected to a driving crank arm (2); an end of the driving crank arm (2) is connected to a pull rod (5); The pull rod (5) is connected to the intermediate pull rod (6) through a transmission arm; the intermediate pull rod (6) is connected to a contact spring device (7), and the contact spring device (7) is connected to a moving contact; An opening buffer (8) for limiting the opening position and a closing buffer (9) for limiting the closing position are provided within the rotation range of the driving crank arm (2).

2. The mechanical locking self-holding transmission device for high-voltage vacuum circuit breaker according to claim 1, characterized in that: The output shaft of the driving device (1) is connected to the first end of the driving crank arm (2) via a spline, and the driving device (1) drives the driving crank arm (2) to rotate.

3. The mechanical locking self-holding transmission device for high-voltage vacuum circuit breaker according to claim 1, characterized in that: The second end of the driving crank arm (2) is rotatably connected to the pull rod (5) via an axle pin.

4. The mechanical locking self-holding transmission device for high-voltage vacuum circuit breaker according to claim 3 is characterized in that: The pull rod (5) is provided with a straight section and an arc section; The first end of the circular arc segment is rotatably connected to the driving crank arm (2) via a shaft pin; the second end of the circular arc segment is connected to the first end of the straight segment; and the second end of the straight segment is connected to the transmission arm.

5. The mechanical locking self-holding transmission device for high-voltage vacuum circuit breaker according to claim 1, characterized in that: The transmission arm is provided with a straight crank arm (10) and an inner crank arm (11); the straight crank arm (10) and the inner crank arm (11) are rotatably connected via a transmission shaft (12).

6. The mechanical locking self-holding transmission device for high-voltage vacuum circuit breaker according to claim 5, characterized in that: The inner crank arm (11) is rotatably connected to the middle pull rod (6) via an axle pin.

7. The mechanical locking self-holding transmission device for high-voltage vacuum circuit breaker according to claim 1, characterized in that: Also includes: A base, an opening buffer (8) and a closing buffer (9) are respectively fixed on the base; The closing buffer (9) is arranged close to one side of the pull rod (5), and the opening buffer (8) is arranged away from the pull rod (5).

8. The mechanical locking self-holding transmission device for high-voltage vacuum circuit breaker according to claim 5, characterized in that: Also includes: Support; A bearing is provided on the support, and the transmission shaft (12) is rotatably connected to the bearing.

9. A high-voltage vacuum circuit breaker mechanical locking self-holding transmission method, characterized in that: The method is implemented based on the mechanical locking self-holding transmission device of a high-voltage vacuum circuit breaker according to any one of claims 1 to 8; The method comprises: a closing operation; a driving device drives a driving crank arm to rotate, drives the crank arm and drives a pull rod (5) to rotate in the direction of a closing buffer (9); The pull rod (5) drives the middle pull rod (6) to move upward through the transmission arm, so that the contact spring device moves upward synchronously; When the driving crank arm (2) rotates to an angle with the horizontal position that is greater than a preset closing angle, the driving crank arm (2) abuts against the closing buffer (9), thereby closing the moving contact and the stationary contact of the high-voltage vacuum circuit breaker, and the spring compression of the contact spring device provides a contact closing retention force for the moving contact and the stationary contact.

10. The high-voltage vacuum circuit breaker mechanical locking self-holding transmission method according to claim 9, characterized in that: The method also includes: opening operation; The driving device drives the driving crank arm to rotate, drives the crank arm and drives the pull rod (5) to rotate in the direction of the opening buffer (8); The pull rod (5) drives the middle pull rod (6) to move downward through the transmission arm, so that the contact spring device moves downward synchronously; When the driving crank arm (2) rotates to an angle with the horizontal position that is greater than a preset opening angle, the driving crank arm (2) abuts against the opening buffer (8), thereby achieving separation of the moving contact and the stationary contact of the high-voltage vacuum circuit breaker.

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