CN108831796B

CN108831796B - Switching gate driving device of vacuum circuit breaker

Info

Publication number: CN108831796B
Application number: CN201810996870.7A
Authority: CN
Inventors: 周鹤铭
Original assignee: Zhejiang Ziguang Electric Appliance Co ltd
Current assignee: Zhejiang Ziguang Electric Appliance Co ltd
Priority date: 2018-08-29
Filing date: 2018-08-29
Publication date: 2024-02-20
Anticipated expiration: 2038-08-29
Also published as: CN108831796A

Abstract

The invention provides a switching gate driving device of a vacuum circuit breaker, and belongs to the technical field of high-voltage switch equipment. The switching device solves the problem that the switching speed of the existing vacuum circuit breaker is low. The driving device comprises a support, a driving mechanism and an accelerating mechanism, wherein the driving mechanism is provided with a driving rod, the driving rod can move up and down along the axial direction, the accelerating mechanism comprises a crank arm hinged with the support and forming a first hinge point and the other end of the driving rod is connected with the driving rod, a connecting rod hinged with the crank arm and forming a second hinge point, and an elastic unit capable of deforming and storing energy along the vertical direction under stress and enabling the connecting rod to have upward thrust, the elastic unit is hinged with the connecting rod and forming a third hinge point, the first hinge point is positioned above the third hinge point, the second hinge point is positioned between the first hinge point and the third hinge point, and the second hinge point can swing back and forth at two sides of a connecting line of the first hinge point and the third hinge point. The invention can not only improve the opening and closing speed of the arc extinguish chamber, but also keep the stable connection of the moving contact and the fixed contact after closing.

Description

Switching gate driving device of vacuum circuit breaker

Technical Field

The invention belongs to the technical field of high-voltage switch equipment, and relates to a vacuum circuit breaker, in particular to a switching gate driving device of the vacuum circuit breaker.

Background

The vacuum circuit breaker is named because the arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; the arc extinguishing device has the advantages of small volume, light weight, suitability for frequent operation and no maintenance in arc extinguishing, and is more popular in power distribution networks. In the use process of the vacuum circuit breaker, an electric arc is easy to generate when a moving contact and a fixed contact of the vacuum circuit breaker are close, so that the switching-on and switching-off speed of the vacuum circuit breaker is better and better, the generation of the electric arc is reduced, and the damage to equipment is reduced. Therefore, the opening and closing brake driving device of the vacuum circuit breaker is one of the core components of the vacuum circuit breaker, and the stability and the driving speed of the opening and closing brake driving device are important.

At present, an opening and closing brake driving device of a vacuum circuit breaker mainly comprises a spring operating mechanism adopting a mechanical principle, a permanent magnet operating mechanism adopting an electromagnet principle and a repulsive force mechanism adopting an electromagnetic vortex repulsive force principle, wherein in order to realize automation, the permanent magnet operating mechanism and the repulsive force mechanism are widely applied.

The high-speed vacuum circuit breaker based on eddy current driving as disclosed in Chinese patent application (application number: 201510914752.3) comprises a metal disc fixedly arranged on a connecting rod, wherein a closing coil and a separating coil are respectively arranged above and below the metal disc, and the closing and opening of the metal disc are respectively electrified to generate magnetic fluxes through the closing coil and the separating coil, so that the metal disc generates a reverse induction magnetic field to form eddy current repulsive force to drive the connecting rod to move. Because the size of the repulsive force is inversely proportional to the square of the distance between objects, although the initial stress of the connecting rod is larger, the stress of the connecting rod is rapidly reduced along with the movement of the connecting rod, so that the connecting rod is larger in instantaneous stress and then weak, the connecting rod is unstable in stress and poor in continuity, and the later speeds of closing and opening are lower, so that the overall time of closing and opening is still longer, and arc extinction is not facilitated.

Although the Chinese patent application (application number: 200420109710. X) discloses a 126KV single-fracture outdoor high-voltage vacuum circuit breaker, a permanent magnet operating mechanism is adopted to drive an insulating pull rod to move up and down to open and close a brake, and a brake separating accelerating spring is sleeved at the lower part of a driving rod to improve brake separating speed. However, because the brake-separating accelerating spring is directly sleeved on the driving rod, the elastic force provided by the brake-separating accelerating spring is required to be stored in the process of switching on, namely, the brake-separating accelerating spring does work reversely in the process of switching on, so that the vacuum circuit breaker is difficult to switch on, the time required by the adhesion of the moving contact and the fixed contact in the vacuum arc-extinguishing chamber is long, namely, the time of the existence of an electric arc is prolonged, and the risk of switching on is increased.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a switching gate driving device of a vacuum circuit breaker, which aims to solve the technical problems that: how to improve the opening and closing speed and stability of the vacuum circuit breaker.

The aim of the invention can be achieved by the following technical scheme:

the utility model provides a vacuum circuit breaker's floodgate drive arrangement that opens and shuts, includes support, actuating mechanism and acceleration mechanism, the actuating lever that has vertical setting on the actuating mechanism, the actuating lever can be followed the axial and reciprocated and is used for realizing vacuum circuit breaker's floodgate that opens and shuts, acceleration mechanism includes that one end is articulated and is formed with hinge point one and the other end is connected with the actuating lever turning arm, articulated and form hinge point two with the turning arm and can follow vertical direction atress deformation energy storage and make the connecting rod have the elastic element of upward thrust all the time, elastic element articulates and forms hinge point three with the connecting rod, hinge point one is located the top of hinge point three, hinge point two is located hinge point one and hinge point three and hinge point two can make a round trip the swing in hinge point one and hinge point three both sides of connecting wire.

The vacuum circuit breaker comprises a vacuum arc-extinguishing chamber and an insulating pull rod connected with a moving contact of the vacuum arc-extinguishing chamber, wherein a driving rod of the opening and closing brake driving device is fixedly connected with the insulating pull rod, so that the insulating pull rod can control the connection and separation of the moving contact and a fixed contact in the vacuum arc-extinguishing chamber, and the opening and closing brake action of the vacuum circuit breaker is realized. The accelerating mechanism enables the connecting rod to always have upward thrust along the axial direction of the connecting rod through the elastic unit, the connecting rod transmits the thrust to the driving rod through the crank arm, and the elastic unit can store energy and release potential energy to accelerate the movement of the driving rod in the opening or closing process through the cooperation of the connecting rod, the crank arm and the driving rod. When the switch is closed, the driving rod is positioned at the lowest point and moves upwards, so that the crank arm is driven to swing, the crank arm drives the connecting rod to swing, the hinge point II swings from one side far away from the driving rod to one side of a connecting line between the hinge point I and the hinge point III, meanwhile, the elastic unit is pressed, deformed and stored, after the hinge point II passes through the connecting line between the hinge point I and the hinge point III, the elastic unit starts to stretch and release potential energy and drives the hinge point II to move towards one side of the driving rod continuously, so that the crank arm provides upward thrust for the driving rod, the moving speed of the driving rod is improved, the switching-on efficiency is improved, and after the switch is closed in place, the accelerating mechanism can continuously provide upward thrust for the driving rod, so that a moving contact and a fixed contact in a vacuum arc extinguishing chamber are tightly attached, and the conduction stability between the moving contact and the fixed contact is better; similarly, when the brake is opened, the accelerating mechanism can also store energy and then release and accelerate the driving rod to move downwards, so that the moving contact and the fixed contact are separated more quickly, and after the brake is opened in place, the accelerating mechanism still provides downward thrust for the driving rod, so that the vacuum circuit breaker is stably in the brake opening state. Especially when the open-close brake driving device adopts a permanent magnet operating mechanism and a repulsive force mechanism, the initial acting force for driving the driving rod to move is larger and is rapidly reduced along with the movement of the driving rod, when the driving rod is positioned at the middle position of the upper coil and the lower coil, the acting force of the driving rod by the driving mechanism is weaker, and at the moment, the elastic unit just starts to release potential energy to supplement the acting force of the driving rod, so that the whole driving force borne by the driving rod is more stable, and the average open-close brake speed of the vacuum circuit breaker is faster.

In the above-mentioned vacuum circuit breaker's floodgate drive arrangement that opens and shuts, the turning arm includes articulated portion, first swing arm and second swing arm all link firmly with articulated portion and form the contained angle, hinge point one is located articulated portion, hinge point two is located first swing arm, it has the spout to extend its length direction on the second swing arm, set firmly the driving pin on the actuating lever, the driving pin articulates in the spout and can follow the length direction slip of spout. The second swing arm of the crank arm is movably connected with the transmission pin on the driving rod through the sliding groove, so that the transmission pin can move relative to the sliding groove when the crank arm drives the driving rod to move or the driving rod drives the crank arm to move, and only axial acting force along the driving rod is generated between the crank arm and the driving rod, so that the crank arm and the driving rod are prevented from being blocked.

In the above-mentioned vacuum circuit breaker's floodgate drive arrangement that opens and shuts, the turning arm includes articulated portion, first swing arm and second swing arm all link firmly with articulated portion and form the contained angle, hinge point one is located articulated portion, hinge point two is located first swing arm, the one end that the articulated portion was kept away from to the actuating lever has set firmly the adapter sleeve, have the sliding tray along the radial extension of actuating lever on the adapter sleeve, the connecting pin has set firmly on the second swing arm, the connecting pin articulates in the sliding tray and can follow the length direction slip of sliding tray. Thus, the transmission between the swing and the driving rod can be realized, and the clamping is avoided.

In the opening and closing brake driving device of the vacuum circuit breaker, the included angle between the first swing arm and the second swing arm is 80-135 degrees. In the angle range, the force transmission between the driving rod and the crank arm is smoother, namely the opening and closing brake is more stable and smoother in acceleration, and the acceleration effect is better.

In the opening and closing brake driving device of the vacuum circuit breaker, a plurality of accelerating mechanisms are arranged and evenly distributed around the axial lead of the driving rod. Therefore, the radial resultant force born by the driving rod is zero, the driving rod is prevented from deforming or displacing in the opening and closing process, the movement precision of the driving rod is higher, the movement is smoother, and the opening and closing speed is higher.

In the above-mentioned vacuum circuit breaker's floodgate drive arrangement that opens and shuts, the elastic element includes the guide holder, the guide holder is cylindric and links firmly with the support vertically, and open along the axial the up end of guide holder has first guiding hole, sliding connection has the slider articulated with the connecting rod in the first guiding hole, still be equipped with in the first guiding hole and make the slider have the spring of upward movement trend all the time. In this way, the slider can stably provide an upward thrust to the link.

In the above-mentioned vacuum circuit breaker's floodgate drive arrangement that opens and shuts, the diapire of first guiding hole opens there is the second guiding hole, the slider includes the sliding part with first guiding hole sliding fit and with second guiding hole sliding fit's guide bar. The sliding block and the guide seat are in double matching with the first guide hole and the second guide hole through the sliding part, so that the movement precision of the sliding block is higher,

in the above-mentioned vacuum circuit breaker's floodgate drive arrangement that opens and shuts, still be equipped with the regulation seat in the first guiding hole, threaded connection has a plurality of adjusting bolt on the diapire of first guiding hole, adjusting bolt's front end stretches into in the first guiding hole and supports with the regulation seat and lean on, the spring housing is located on the guide bar and both ends are supported with sliding part and regulation seat respectively and are leaned on. The pretightening force of the spring can be adjusted by adjusting the position of the adjusting seat.

In the opening and closing brake driving device of the vacuum circuit breaker, an oil buffer is further arranged below the driving rod, and the oil buffer and the driving rod are located on the same axis. Therefore, the driving rod can be abutted against the hydraulic buffer when the brake is opened in place, so that the driving rod is slowed down and stopped, and the driving rod is prevented from being damaged due to rigid collision or strong impact with other parts.

In the opening and closing brake driving device of the vacuum circuit breaker, the driving mechanism is a repulsive force mechanism or a permanent magnet operating mechanism. The repulsion mechanism or the permanent magnet operating mechanism is adopted, the brake opening and closing driving device is easier to realize automation, the operation is simpler and more convenient, and the brake opening and closing reaction speed is faster.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, the crank arm, the connecting rod and the elastic element are matched, so that the elastic unit can deform and store energy and release potential energy in the opening and closing processes, the speed of the driving rod is accelerated, the opening and closing action of the driving rod is more stable, the continuity is better, and the average opening speed is higher.

2. After the switch is opened or closed in place, the crank arm can still apply axial acting force to the driving rod, so that the driving rod can stably maintain the current state, the driving rod cannot automatically move upwards in the switch-on state, and the movable contact and the fixed contact in the vacuum arc extinguishing chamber can stably abut in the switch-on state.

3. The elastic units are uniformly distributed around the axial lead of the driving rod, so that the driving rod is stressed more uniformly in the radial direction, and the connecting shaft moves more accurately and smoothly along the axial direction.

Drawings

Fig. 1 is a schematic structural view of a vacuum circuit breaker;

FIG. 2 is a schematic diagram of the structure of the shutter driving device;

FIG. 3 is an enlarged view of portion a of FIG. 2;

FIG. 4 is a schematic view of the structure of an accelerator mechanism in an open state

FIG. 5 is a schematic diagram of the structure of the acceleration mechanism during closing;

FIG. 6 is a schematic view of the structure of the acceleration mechanism in a closed state;

FIG. 7 is a schematic view of the structure of the lever;

fig. 8 shows another connection of the lever to the drive rod.

In the figure, 1, a seat body; 2. a column unit; 21. a tank body, 22 and a vacuum arc extinguishing chamber; 23. an insulating pull rod; 24. a connection terminal; 25. a connecting pipe; 26. a wire outlet conducting rod; 3. an opening and closing driving device; 4. a bracket; 41. a partition plate; 42. a column; 43. a fixed rod; 5. a driving mechanism; 51. a driving rod; 52. a repulsive force disk; 53. a closing coil; 54. a brake-separating coil; 55. connecting sleeves; 551. a drive pin; 552. a connection part; 553. a sliding groove; 6. an acceleration mechanism; 61. a crank arm; 611. a hinge part; 611a, hinge point one; 612. a first swing arm; 612a, hinge point two; 613. a second swing arm; 613a, a chute; 613b, connecting pins; 62. a connecting rod; 621. a hinge point III; 63. an elastic unit; 631. a guide seat; 631a, a first guide hole; 631b; a second guide hole; 632. a slide block; 632a, a sliding portion; 632b, guide bar; 633. a spring; 634. an adjusting seat; 635. an adjusting bolt; 7. and a hydraulic buffer.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Example 1

As shown in fig. 1, the vacuum circuit breaker is a 363KV ultrahigh-voltage double-break vacuum circuit breaker, the vacuum circuit breaker comprises a base 1, and two upright post 42 units 2 arranged on the base 1 at intervals, each upright post unit 2 comprises a tank 21, a vacuum arc-extinguishing chamber 22 and an opening and closing brake driving device 3, the two tank 21 are of hollow structures and are communicated through a connecting pipe 25, the vacuum arc-extinguishing chamber 22 and the opening and closing brake driving device 3 are both positioned in the tank 21, a connecting terminal 24 used for being connected with a circuit is arranged at the upper end of the tank 21, the connecting terminal 24 is connected with a fixed contact at the upper end of the vacuum arc-extinguishing chamber 22, a movable contact at the lower end of the two vacuum arc-extinguishing chambers 22 is connected with the opening and closing brake driving device 3 through an insulating pull rod 23 which is arranged vertically, and the two opening and closing brake driving devices 3 can drive the two insulating pull rods 23 to move up and down simultaneously through the control of a control device, so that the fixed contact and the movable contact in each vacuum arc-extinguishing chamber 22 are simultaneously attached to or separated, namely the vacuum circuit breaker is closed or opened.

As shown in fig. 2, the present shutter driving device 3 includes a bracket 4, a driving mechanism 5, and an accelerating mechanism 6. The bracket 4 comprises three layers of partition boards 41 which are sequentially distributed at intervals from top to bottom, and upright posts 42 are fixedly connected between the adjacent partition boards 41. The driving mechanism 5 is fixedly arranged on the top surface of the uppermost partition 41 and comprises a driving rod 51 which is vertically arranged, the upper end of the driving rod 51 is fixedly connected with an insulating pull rod 23, the lower end of the driving rod 51 is connected with an accelerating mechanism 6, a repulsive force disc 52 which surrounds the driving rod 51 is fixedly arranged in the middle of the driving rod 51, the repulsive force disc 52 is made of a magnetic resistance metal material, a switching-off coil 54 and a switching-on coil 53 are fixedly arranged above and below the repulsive force disc 52 respectively, a certain interval is reserved between the switching-off coil 54 and the switching-on coil 53, vortex repulsive force generated by magnetic flux change is generated between the switching-off coil 54 or the switching-on coil 53 when the switching-on coil 53 is electrified, and the repulsive force disc 52 drives the driving rod 51 to move up and down so as to control the connection and disconnection of the vacuum arc-extinguishing chamber 22. The accelerating mechanism 6 is located at the lower part of the support 4 and comprises a crank arm 61, a connecting rod 62 and an elastic unit 63, the crank arm 61 is hinged with the support 4 and is provided with a first hinge point 611a, one end of the crank arm 61 is connected with the driving rod 51, the other end of the crank arm 61 is hinged with one end of the connecting rod 62 and forms a second hinge point 621, the other end of the connecting rod 62 is hinged with the elastic unit 63 and forms a third hinge point 621, the elastic unit 63 can be pressed and elastically deformed to store energy and enable the connecting rod 62 to always have upward thrust, the second hinge point 612a is located between the first hinge point 611a and the third hinge point 621, the second hinge point 612a can swing left and right around the connecting line of the first hinge point 611a and the third hinge point 621, the driving rod 51 can be driven by the driving rod 61 to swing or the crank arm 61 to drive the driving rod 51 to move up and down, so that the accelerating mechanism 6 can store energy first and then release potential energy in the switching-on or switching-off process to accelerate the movement of the driving rod 51, and the average switching-on speed of the driving rod 51 is increased, and the switching-off speed is increased.

Specifically, as shown in fig. 2, 4 and 7, the crank arm 61 includes a hinge portion 611, a first swing arm 612 and a second swing arm 613, where the first swing arm 612 and the second swing arm 613 are fixedly connected to the hinge portion 611 and form an included angle, and the size of the included angle is between 80 ° and 135 °. The hinge portion 611 is hinged to the fixed rod 43 fixed to the partition 41 to form a first hinge point 611a, the front end of the first swing wall is hinged to the connecting rod 62 to form a second hinge point, the second swing arm 613 is provided with a sliding groove 613a along the length direction thereof, the lower end of the driving rod 51 is fixedly connected to the connecting sleeve 55, the connecting sleeve 55 is fixedly provided with a transmission pin 551, and the transmission pin 551 is hinged in the sliding groove 613a and can slide along the length direction of the sliding groove 613 a. In this way, the crank arm 61 can swing around the intersection point to drive the driving rod 51 to move up and down, or the driving rod 51 can move up and down to drive the crank arm 61 to swing, so that the crank arm 61 and the driving rod 51 are prevented from being blocked.

As shown in fig. 3, the elastic unit 63 includes a guide seat 631, a slider 632, and a spring 633, the guide seat 631 is cylindrically and vertically fixed to a side lower portion of the driving lever 51, a first guide hole 631a is opened on an upper end surface of the guide seat 631 in an axial direction thereof, and the slider 632 is located in the first guide hole 631a and always has a tendency to move upward by the spring 633. The sliding block 632 comprises a sliding part 632a and a guide rod 632b, wherein the sliding part 632a is cylindrical and matched with the first guide hole 631a in shape, and is in sliding fit with the first guide hole 631a, one end of the sliding part 632a is hinged with the connecting rod 62, the guide rod 632b is integrally connected with the other end of the sliding part 632a and extends along the axial direction of the sliding part 632a, the bottom wall of the first guide hole 631a is also provided with a second guide hole 631b, and the guide rod 632b extends into the second guide hole 631b and is in sliding fit with the second guide hole 631b, so that the sliding block 632 can slide along the axial direction of the guide seat 631 and the sliding precision is ensured. The first guiding hole 631a is further internally provided with an adjusting seat 634, the bottom wall of the first guiding hole 631a is further in threaded connection with a plurality of adjusting bolts 635, the adjusting bolts 635 are evenly distributed around the axis of the guiding seat 631, the front ends of the adjusting bolts 635 extend into the first guiding hole 631a and are abutted against the adjusting seat 634, the spring 633 is sleeved on the guiding rod 632b, the two ends of the spring 633 are respectively abutted against the sliding part 632a and the adjusting seat 634, the height of the adjusting seat 634 is adjusted through the adjusting bolts 635, the pretightening force of the spring 633 can be adjusted, and the accelerating effect of the accelerating mechanism 6 is optimized.

Thus, when the opening and closing brake driving device 3 works, as shown in fig. 4, the vacuum circuit breaker is in the opening state, the insulating pull rod 23 is at the lowest point, one end of the second swing arm 613, which is matched with the transmission pin 551, is also at the lowest point, and meanwhile, the second hinge point is positioned on the right side of the connection line between the hinge point one 611a and the hinge point three 621, namely, the position of the second hinge point farthest from the driving rod 51, and the sliding block 632 is also at the highest point; when the closing coil 53 is electrified and the repulsive force disc 52 is driven by repulsive force, the driving rod 51 gradually moves upwards, as shown in fig. 5, the second swing arm 613 also swings upwards along with the driving rod 51, so that the hinge point two 612a gradually moves towards one side of the driving rod 51, and the connecting rod 62 pushes the sliding block 632 to move downwards, so that the spring 633 deforms and stores energy; as the distance between the repulsive force disc 52 and the closing coil 53 increases, the repulsive force applied by the closing coil 53 to the repulsive force disc 52 gradually decreases, as shown in fig. 6, when the hinge point two 612a passes through the connection line between the hinge point one 611a and the hinge point three 621, the spring 633 starts to push the slider 632 to move upwards, so that the connecting rod 62 pushes the crank arm 61 to swing, meanwhile, the second swing arm 613 applies an upward acting force to the driving rod 51, so that the driving rod 51 is pushed to move upwards together with the repulsive force of the closing coil 53, so as to increase the closing speed, and after the vacuum circuit breaker is closed in place, the driving rod 51 is at the highest point, the second swing arm 613 still applies an upward acting force to the driving rod 51, so that the moving contact and the fixed contact in the vacuum arc extinguishing chamber 22 are kept closely attached, and the conductivity stability of the vacuum circuit breaker is improved. Similarly, when the brake is opened, the accelerating mechanism 6 can also store energy and then release the energy, and accelerate the driving rod 51 to move downwards, so that the moving contact and the fixed contact are separated more quickly.

In this embodiment, the number of the elastic units 63 is 3, but other numbers of elastic units 63 can be used in practice, and the elastic units 63 are uniformly distributed around the driving rod 51, so that the resultant force of the driving rod 51 in the radial direction is zero, and the guiding action along the axial direction of the driving rod 51 is formed, so that the driving rod 51 moves more smoothly along the axial direction, and the opening and closing speed is faster.

As shown in fig. 3, the bottom of the bracket 4 is further fixedly provided with a hydraulic buffer 7, and the hydraulic buffer 7 is located below the driving rod 51 and keeps a certain distance from the driving rod 51, so that the hydraulic buffer 7 can abut against the driving rod 51 after the driving rod 51 is opened and moved down, thereby reducing the impact force of the driving rod 51.

Of course, the opening and closing brake driving device 3 in the present embodiment may be used in other single-break vacuum circuit breakers.

Example two

As shown in fig. 8, the technical solution of the present embodiment is basically the same as that of the first embodiment, except that in the present embodiment, the driving mechanism 5 is a permanent magnet operating mechanism adopting the electromagnet principle, and in the present embodiment, a connecting pin 613b is fixedly arranged at one end of the second swing arm 613 of the crank arm 61, which is far away from the hinge portion 611, a connecting portion 552 extending along the radial direction of the driving rod 51 is provided on the connecting sleeve 55 fixedly connected with the driving rod 51, a sliding groove 553 extending along the radial direction of the driving rod 51 is provided on the connecting portion 552, and the connecting pin 613b is hinged in the sliding groove 552 and can slide along the length direction of the sliding groove 552.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although terms of the base 1, the column unit 2, the vacuum interrupter 22, the insulation rod 23, the connection terminal 24, the bracket 4, the driving mechanism 5, the driving rod 51, the connection sleeve 55, the transmission pin 551, the acceleration mechanism 6, the crank arm 61, the hinge 611, the first swing arm 612, the link 62, the hinge joint three 621, the elastic unit 63, the guide seat 631, the slider 632, the sliding portion 632a, the guide rod 632b, the spring 633, the adjustment seat 634, the hydraulic buffer 7, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.

Claims

1. The opening and closing brake driving device of the vacuum circuit breaker comprises a bracket (4), a driving mechanism (5) and an accelerating mechanism (6), wherein the driving mechanism (5) is provided with a driving rod (51) which is vertically arranged, the driving rod (51) can move up and down along the axial direction and is used for realizing the opening and closing brake of the vacuum circuit breaker, and the opening and closing brake driving device is characterized in that the accelerating mechanism (6) comprises a crank arm (61) with one end hinged with the bracket (4) and the other end connected with the driving rod (51), a connecting rod (62) hinged with the crank arm (61) and forming a second hinge point (612 a) and an elastic unit (63) which can deform and store energy along the vertical direction and enable the connecting rod (62) to always have upward pushing force, the elastic unit (63) is hinged with the connecting rod (62) and forms a third hinge point (621), the first hinge point (611 a) is positioned above the third hinge point (611), the second hinge point (612 a) is positioned between the first hinge point (611 a) and the third hinge point (621) and the second hinge point (612 a) and the connecting rod (612 a) can swing on two sides of the bracket (631) and the connecting seat (4) and the elastic unit (631) which can swing along the vertical direction, the upper end and the lower end of the guide seat (631) are embedded in the opening, the outer diameter of the cylinder wall of the guide seat (631) is larger than that of the guide seat cylinder wall embedded in the opening, the guide seat (631) is cylindrical and vertically fixedly connected with the upper bracket and the lower bracket (4), a first guide hole (631 a) is formed in the upper end face of the guide seat (631) along the axial direction, a sliding block (632) hinged with the connecting rod (62) is connected in the first guide hole (631 a) in a sliding mode, a second guide hole (631 b) is formed in the bottom wall of the first guide hole (631 a), and the sliding block (632) comprises a sliding part (632 a) which is in sliding fit with the first guide hole (631 a) and a guide rod (632 b) which is in sliding fit with the second guide hole (631 b).

2. The opening and closing brake driving device of the vacuum circuit breaker according to claim 1, wherein the crank arm (61) comprises a hinge part (611), a first swing arm (612) and a second swing arm (613), the first swing arm (612) and the second swing arm (613) are fixedly connected with the hinge part (611) to form an included angle, the hinge point one (611 a) is located on the hinge part (611), the hinge point two (612 a) is located on the first swing arm (612), a sliding groove (613 a) is formed in the second swing arm (613) along the length direction of the second swing arm, a transmission pin (551) is fixedly arranged on the driving rod (51), and the transmission pin (551) is hinged in the sliding groove (613 a) and can slide along the length direction of the sliding groove (613 a).

3. The opening and closing brake driving device of the vacuum circuit breaker according to claim 1, wherein the crank arm (61) comprises a hinge part (611), a first swing arm (612) and a second swing arm (613), the first swing arm (612) and the second swing arm (613) are fixedly connected with the hinge part (611) to form an included angle, the hinge point one (611 a) is located on the hinge part (611), the hinge point two (612 a) is located on the first swing arm (612), a connecting sleeve (55) is fixedly arranged on the driving rod (51), a sliding groove (553) extending along the radial direction of the driving rod (51) is formed in the connecting sleeve (55), a connecting pin (613 b) is fixedly arranged at one end, far away from the hinge part (611), of the second swing arm (613), and the connecting pin (613 b) is hinged in the sliding groove (553) and can slide along the length direction of the sliding groove (553).

4. A switching-on/off driving device of a vacuum circuit breaker according to claim 2 or 3, characterized in that the angle between the first swing arm (612) and the second swing arm (613) is 80-135 °.

5. A switching brake driving device of a vacuum circuit breaker according to claim 1, 2 or 3, wherein a plurality of the accelerating mechanisms (6) are provided, and the accelerating mechanisms (6) are uniformly distributed around the axis of the driving rod (51).

6. The opening and closing brake driving device of a vacuum circuit breaker according to claim 5, wherein a spring (633) for always moving the slider (632) upward is further provided in the first guide hole (631 a).

7. The opening and closing brake driving device of the vacuum circuit breaker according to claim 6, wherein an adjusting seat (634) is further arranged in the first guide hole (631 a), a plurality of adjusting bolts (635) are connected to the bottom wall of the first guide hole (631 a) in a threaded manner, the front ends of the adjusting bolts (635) extend into the first guide hole (631 a) to be abutted against the adjusting seat (634), and the spring (633) is sleeved on the guide rod (632 b) and the two ends of the spring are abutted against the sliding part (632 a) and the adjusting seat (634) respectively.

8. The opening and closing brake driving device of the vacuum circuit breaker according to claim 7, wherein a hydraulic buffer (7) is further arranged below the driving rod (51), and the hydraulic buffer (7) and the driving rod (51) are positioned on the same axis.

9. A switching-on/off drive device of a vacuum circuit breaker according to claim 1 or 2 or 3, characterized in that the drive mechanism (5) is a repulsive force mechanism or a permanent magnet operating mechanism.