WO2020073847A1

WO2020073847A1 - Circuit breaker and double-action transmission device thereof

Info

Publication number: WO2020073847A1
Application number: PCT/CN2019/108968
Authority: WO
Inventors: 史俊; 崔明硕; 孙会峰; 陈杳伟; 杨龙
Original assignee: 西安西电开关电气有限公司; 中国西电电气股份有限公司
Priority date: 2018-10-11
Filing date: 2019-09-29
Publication date: 2020-04-16
Also published as: CN109192597B; CN109192597A

Abstract

A circuit breaker and a double-action transmission device thereof. The double-action transmission device (2) of the circuit breaker comprises a connection rod (21), a connection plate (22), and a connection plate transmission assembly. The connection plate transmission assembly comprises a first connection plate (24) and a second connection plate (25) hinge-connected to the first connection plate (24). An end of the first connection plate (24) away from the second connection plate (25) is hinge-connected to the connection rod (21) by means of a first rotary pin (23). An end of the second connection plate (25) away from the first connection plate (21) is hinge-connected to a driven-side connection member (3) by means of a second rotary pin (26). A first guide hole (221) for the movement of the first rotary pin (23) and a second guide hole (222) for the movement of the second rotary pin (26) are provided on the connection plate (22). In the double-action transmission device, the connection plate transmission assembly comprises the first connection plate (24) and the second connection plate (25), and the length of the first connection plate (24) and the length of the second connection plate (25) are adjusted according to transmission speed requirements, such that the movement speed and the transmission of the connection plate transmission assembly are not affected by the distance between the driven-side connection member (3) and a driving-side connection member (1). Therefore, the invention is applicable to performing breaking at a high voltage level, and the versatility of the double-action transmission device is improved.

Description

Circuit breaker and its double-acting transmission device

Technical field

The invention relates to the technical field of high-voltage switch transmission, in particular to a double-acting transmission device of a circuit breaker. The invention also relates to a circuit breaker including the above double-acting transmission device.

Background technique

The circuit breaker is a switch device used in the power grid line to realize the closing and separation of the power grid circuit, in which the double-acting circuit breaker can move in both parts of the contact contact of the internal disconnection. During the disconnection operation, the circuit breaker disconnection contact The conductive components are divided into main contacts and arc contacts, where the main contacts play the role of passing the rated current. When the breaking occurs, the main contacts are detached first, the arc contacts are not detached, and the current channel is transferred from the main contacts to On the arc contact, immediately after the arc contact detaches, the current forms an arc when the arc contact detaches.

The conventional circuit breaker includes an active-side connector, a driven-side connector, and a double-action transmission device that transmits power from the master-slave side to the position of the driven-side connector. The double-action transmission device includes a connection that is fixedly connected to the active-side connector The rod and the connecting plate at both ends are respectively connected with the connecting rod and the driven side connecting piece, wherein the connecting rod is hinged with the connecting plate.

However, since the driving-side connecting piece and the driven-side connecting piece are only transmitted through the connecting plate, the speed transmission of the driving-side connecting piece and the driven-side connecting piece is connected to the connecting point of the connecting rod and the driven-side connecting piece on the connecting plate Due to the influence of the distance between the hinge points, it is impossible to break at high voltage levels, and the versatility of the double-acting transmission is poor.

Therefore, how to improve the versatility of the double-acting transmission device is a technical problem to be solved urgently by those skilled in the art.

Summary of the invention

An object of the present invention is to provide a double-acting transmission device for a circuit breaker, which has improved versatility. Another object of the present invention is to provide a circuit breaker including the above double-acting transmission device.

To achieve the above object, the present invention provides a double-acting transmission device for a circuit breaker, including a connecting rod, a connecting plate and a connecting plate transmission assembly, the connecting plate transmission assembly includes a first connecting plate and the first connecting plate A second connecting plate hinged to the plate, an end of the first connecting plate away from the second connecting plate is hinged with the connecting rod through a first rotating pin, and the second connecting plate is away from the first connecting plate One end of the hinge is hinged with the driven side connecting member through a second rotating pin, and a first guide hole for moving the first rotating pin and a second guide for moving the second rotating pin are provided on the connecting plate hole.

Preferably, the connecting plate transmission assembly further includes a limit guide, the limit guide is fixedly connected to the connecting plate, and the first connecting plate is provided with a motion capable of cooperating with the limit guide Guide chute.

Preferably, the second rotating pin is located between the hinge point of the first and second connecting plates and the first rotating pin.

Preferably, the connecting plate is provided with a third guide hole for accommodating the connecting rod, and the connecting rod can slide along the third guide hole.

Preferably, the connecting plate is provided with a fourth guide hole for accommodating the driven-side connector, the center line of the fourth guide hole, the first guide hole, the second guide hole and the third guide hole Parallel setting

Preferably, the guide chute is a straight chute.

Preferably, there are two connecting plate transmission assemblies, two of the connecting plate transmission assemblies are arranged on opposite sides of the connecting plate, the connecting rods are two, and the two connecting rods are respectively connected to two The first connecting board corresponds.

Preferably, the two limit guides are coaxially symmetrical on opposite sides of the connecting plate.

Preferably, the two limit guides are distributed on opposite sides of the second guide hole.

Preferably, the angle between the first connecting plate and the first guide hole is a;

When the angle a in the initial state of opening is less than 45 °, the follower arc contact and the connecting piece on the active side move in the same direction and then move in the opposite direction when opening;

When the angle a of the initial state of opening is greater than 45 °, the driven arc contact and the connecting part on the active side simultaneously move in the reverse direction when opening.

Preferably, the first connecting plate changes with angle a during rotation, and the first rotation pin reaches the maximum transmission ratio at point X, where point X is that the first rotation pin moves in the slide rail to a distance from the rotation axis At the position with the shortest distance, the formula for the transmission ratio is:

Where n is the variable ratio, L is the length of the first connecting plate, and S is the distance from the limit guide to point X.

A circuit breaker includes a driven-side connector, an active-side connector, and a double-motion transmission device. The double-motion transmission device is the double-motion transmission device according to any one of the above.

In the above technical solution, the double-acting transmission device of the circuit breaker provided by the present invention includes a connecting rod, a connecting plate and a connecting plate transmission assembly. The connecting plate transmission assembly includes a first connecting plate and a second connection hinged with the first connecting plate Plate, the end of the first connecting plate away from the second connecting plate is hinged with the connecting rod through the first rotating pin, and the end of the second connecting plate away from the first connecting plate is hinged and connected with the driven side connecting member through the second rotating pin The board is provided with a first guide hole for moving the first rotating pin and a second guide hole for moving the second rotating pin. When assembling the circuit breaker, the end of the connecting rod away from the first connecting plate is connected to the driving-side connector, and the second rotating pin is connected to the driven-side connector.

It can be known from the above description that, in the double-acting transmission device provided by the present application, since the connecting plate transmission assembly includes the first connecting plate and the second connecting plate, the lengths of the first connecting plate and the second connecting plate are adjusted according to the transmission speed requirements, so that The moving speed transmission of the connecting plate is not affected by the distance between the driven side connecting member and the active connecting member, and can be applied to high voltage levels to achieve breaking, and the versatility of the double-acting transmission device is improved.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only This is an embodiment of the present invention. For a person of ordinary skill in the art, without paying any creative labor, other drawings may be obtained according to the provided drawings.

1 is a schematic structural diagram of a circuit breaker provided by an embodiment of the present invention;

2 is a diagram of an installation position of a double-acting transmission device provided by an embodiment of the present invention;

3 is a schematic structural diagram of a double-acting transmission device provided by an embodiment of the present invention;

4 is a schematic structural diagram of a connection board provided by an embodiment of the present invention;

5 is a side view of the connection board shown in FIG. 4;

6 is a schematic structural diagram of another connection board provided by an embodiment of the present invention;

7 is a side view of the connecting plate shown in FIG. 6;

8 is a schematic structural diagram of a connecting rod provided by an embodiment of the present invention;

9 is a schematic structural diagram of a driven-side connector provided by an embodiment of the present invention;

10 is a schematic structural diagram of a first connecting plate provided by an embodiment of the present invention;

11 is a schematic structural diagram of a second connecting plate provided by an embodiment of the present invention;

12 is a schematic structural diagram of an active-side connector provided by an embodiment of the present invention;

13 is a schematic structural view of a first rotation pin provided at an X point according to an embodiment of the present invention;

FIG. 14 is a stroke curve diagram of an active side connector and a driven side connector provided by an embodiment of the present invention.

In Figure 1-13: 1- active side connector, 11- drive connection ring, 12- nozzle, 13- active arc contact, 14- pressure cylinder, 15- piston rod

2-Double-acting transmission, 21-link, 22-connecting plate, 221-first guide hole, 222-second guide hole, 223-third guide hole, 224-fourth guide hole, 23-first rotation Pin, 24-first connecting plate, 241-guide chute, 25-second connecting plate, 26-second rotating pin, 27-limit guide;

3-driven side connector, 31-guide connection device, 32-contact seat, 33-driven arc contact.

detailed description

The core of the present invention is to provide a double-acting transmission device of a circuit breaker, the versatility of the double-acting transmission device is improved. Another core of the present invention is to provide a circuit breaker including the above double-acting transmission device.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Please refer to FIG. 1 to FIG. 14, in a specific embodiment, a double-acting transmission device of a circuit breaker provided by a specific embodiment of the present invention includes a connecting rod 21, a connecting plate 22 and a connecting plate transmission assembly. The connecting plate transmission assembly includes The first connecting plate 24 and the second connecting plate 25 hinged with the first connecting plate 24, the end of the first connecting plate 24 away from the second connecting plate 25 is hinged with the connecting rod 21 through the first rotating pin 23, and the second connecting plate The end on the 25 that is far away from the first connecting plate 24 is hinged with the driven side connecting member 3 through a second rotating pin 26, and the connecting plate 22 is provided with a first guide hole 221 for moving the first rotating pin 23 and a second rotating pin 26 移的第二导孔 222.

When assembling the circuit breaker, the end of the connecting rod 21 away from the first connecting plate 24 is connected to the driving-side connector 1, and the second rotating pin 26 is connected to the driven-side connector 3.

It can be known from the above description that, in the double-acting transmission device provided by the specific embodiment of the present invention, since the connecting plate transmission assembly includes the first connecting plate 24 and the second connecting plate 25, in actual work, the first The length of one connecting plate 24 and the second connecting plate 25 makes the moving speed transmission of the connecting plate transmission assembly not affected by the distance between the driven-side connecting member 3 and the driving-side connecting member 1, and can be applied at high voltage levels to achieve Break, the versatility of the double-acting transmission is improved.

On the other hand, the overall structure is simple and easy to disassemble.

Preferably, as shown in FIG. 3, the connecting plate transmission assembly further includes a limit guide 27. The limit guide 27 is fixedly connected to the connecting plate 22, and the first connecting plate 24 is provided with a movable guide along the limit guide 27.导滑槽 241. The guide chute 241 may be an arc-shaped groove. In order to facilitate the movement of the first connecting plate 24, the guide chute 241 is preferably a straight bar-shaped groove. The guide chute 241 cooperates with the limit guide 27 to move relative to each other. Therefore, the first The connecting plate 24 not only can rotate around the limit guide 27, but also can slide. In order to facilitate the movement of the first link 24, preferably, the limit guide 27 is a bearing.

In order to facilitate the effective transmission of the first connecting plate 24 and the second connecting plate 25, preferably, as shown in FIG. 3, the limit guide 27 is located between the hinge point of the first connecting plate 24 and the second connecting plate 25 and the first rotating pin 23 between.

In order to improve the stability of movement, it is preferable that, as shown in FIG. 2 in conjunction with FIGS. 4, 5 and 12, the connecting plate 22 is provided with a third guide hole 223 for accommodating the connecting rod 21, the connecting rod 21 can be along the third guide hole 223 slide. The transmission connecting ring 11 of the active side connector 1 is connected to the connecting rod 21 by bolts, the connecting rod 21 slides in the third guide hole 223 on the transmission bracket, the pin hole of the connecting rod 21 and the connecting plate pin of the first connecting plate 24 The holes are connected with sliding pins.

Specifically, as shown in FIG. 1, at the starting position of the opening, when the inclination angle a of the first connecting plate 24 and the horizontal line (the center line of the first guide hole 221) is less than 45 degrees, the follower arc contact 33 and the active The arc contact 13 first moves in the same direction and then moves in the opposite direction. When the inclination angle a of the first connecting plate 24 and the horizontal line (the center line of the first guide hole 221) is greater than 45 degrees, the driven arc contact 33 and the active arc contact 13 Reverse movement, the driving-side connecting piece 1 and the driven-side connecting piece 3 move in the same direction and backward at first.

When the active-side connecting piece 1 performs the opening movement with the positions shown in FIGS. 1 and 2 as the starting point, the driven-side connecting piece 3 is driven to move together, and the trajectory of the opening movement is the driven arc of the driven-side connecting piece 3 The contact 33 and the driving side connector 1 move in the same direction, and then the driven arc contact 33 of the driven side connector 3 quickly moves in the direction opposite to the moving direction of the driving side connector 1. The stroke curve is shown in FIG. 14.

Preferably, as shown in FIGS. 4 and 6, the connecting plate 22 is provided with a fourth guide hole 224 for accommodating the driven-side connector 3, a fourth guide hole 224, a first guide hole 221, and a second guide hole 222 It is parallel to the center line of the third guide hole 223. In order to avoid a thicker overall structure, it is preferable that the guide centers of the first guide hole 221, the second guide hole 222, the third guide hole 223, and the fourth guide hole 224 do not coincide. Preferably, the first guide hole 221, the second guide hole 222, the center lines of the third guide hole 223 and the fourth guide hole 224 are arranged in parallel, and the connecting plate 22 has a rectangular structure to facilitate the overall sliding.

Specifically, the first guide hole 221 and the second guide hole 222 may be a chute structure, or both may be a through-hole structure.

During operation, the first connecting plate 24 can slide along the limit guide 27. Therefore, the first connecting plate 24 has the ability to change the lever ratio of the driving-side connecting member 1 and the driven-side connecting member 3, and can realize the preset key As a result of the high-speed movement of the position, the active-side connector 1 connected by the first connecting plate 24 moves along a straight line. As shown in FIGS. 3 and 13, the first link 24 rotates around the limit guide 27 and slides along the slot length of the guide slot 241 of the first link 24 according to the limit guide 27 Movement, sliding movement is sliding under the constraint of the guide chute 241 of the first connecting plate 24. The connected active-side connector 1 moves along a straight line, which has the closest distance to the limit guide 27 surrounded by the first connecting plate 24, and the point of the closest distance at the straight line is named X (as shown in FIG. 13). The active side connector 1 of the connecting rod 21 connected by the first connecting plate 24 moves along a straight line, and the movement moves from the starting position to point X, and passes through point X, and finally stops after point X. In this process, the first link The length of the active side of the plate 24 (that is, the distance from the position where the first connecting plate 24 connects the active side to the limit guide 27) becomes shorter as it approaches point X, while the length of the driven side (that is, the first connecting plate 24 connects to the driven side The distance from the position of the driven side guide to the driven side) as the driving side approaches the point X. As the active side crosses point X, the length change reversely changes, and the highest value of the movement speed of the driven side connected by the first link 24 will appear at point X. Therefore, when the active side moves to near the X point, the driven side moves at a high speed in the reverse direction. When the active side moves farther from the X point, the driven side movement speed will decrease.

Specifically, as shown in FIG. 13, the first connecting plate 24 changes with the angle a during rotation, and the first rotation pin 23 reaches the maximum transmission ratio at point X, where point X is the first rotation pin 23 in the slide rail 221 Move to the position with the shortest distance from the rotating shaft 27, the formula of the transmission ratio is the formula of the transmission ratio:

Where n is the variable ratio, L is the length of the first connecting plate 24, and S is the distance from the limit guide 27 to the X point.

In specific work, the X point position is set near the middle of the 9ms interval after the contact separation during the breaking process, which can achieve the high-speed movement of the driven side of the circuit breaker within the 9ms interval of contact separation, and can achieve the need within 9ms. The distance requirement. Outside of 9ms, the driven side moves at a low speed, saving the operating power of the mechanism.

During the movement, the active arc contact 13 and the driven arc contact 33 first move in the same direction. In the reverse movement feature, the shorter length of the driven arc contact 33 is larger after the active arc contact 13 is separated. Only after the distance, the function of the longer follower arc contact 33 is realized, and the movement operation power is reduced.

The connecting rod 21 has a long straight cylindrical structure, one end of the connecting rod 21 is a bolt hole, the bolt hole is on the end surface of the connecting rod 21, and the other end is a long rod structure of a pin hole. The bolt hole of the connecting rod 21 is connected to the transmission connecting ring 11 Tighten the connection, and one end slides in the first guide hole 221.

In order to facilitate sliding, preferably, the guide chute 241 is a straight chute.

On the basis of the above solution, preferably, there are two connecting plate transmission components, two connecting plate transmission components are arranged on opposite sides of the connecting plate 22, two connecting rods 21, two connecting rods 21 and two first The connecting plates 24 correspond one-to-one, that is, the two connecting rods 21 correspond to the two first connecting plates 24, respectively. There is only one connecting plate transmission component, and the connection reliability of the driven arc contact 33 is not good. The connecting plate transmission component is set to two and is arranged in a cross arrangement, which balances the lateral force of the driven side and solves the problem of low reliability. .

As shown in FIGS. 6 and 7, the two limit guides 27 are coaxially symmetrical on opposite sides of the connecting plate 22.

As shown in FIGS. 4 and 5, the two limiting guides 27 are distributed on opposite sides of the second guide hole 222.

As shown in FIG. 1, a circuit breaker provided by the present invention includes a driven-side connector 3, an active-side connector 1 and a double-acting transmission device 2, wherein the double-acting transmission device 2 is any one of the aforementioned double-acting transmission devices 2. The double-acting transmission device 2 is a mechanical motion transmission device that connects the driven-side connector 3 and the active-side connector 1, and is a mechanical power transmission device that transmits the motive power of the active side to the driven side and provides the motive power for the driven side .

As shown in FIG. 12, the active side structure includes an active arc contact 13, a spout 12, a pressure cylinder 14, a piston rod 15, and a transmission connecting ring 11. All parts do not move relative to each other during movement, and all parts are fixed to each other. Except for the nozzle 12, the other parts are made of metal. The nozzle 12 is made of insulating material. The direction of movement is the axial movement of the piston rod 15.

As shown in FIG. 9, the structure of the driven side includes the driven arc contact 33, the contact base 32, and the guide connection device 31. During the movement, the driven arc contact 33 and the guide connection device 31 move together, keeping the same as the active side Axial movement, the direction of movement is the same or different from the active, the follower arc contact 33 is a sliding motion in the contact holder 32, and the contact holder 32 is a fixed device, which ensures that the follower arc contact 33 is in The role of the sliding constraint in the contact holder 32.

The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can 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 should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

A double-acting transmission device of a circuit breaker, including a connecting rod (21), characterized in that it further comprises a connecting plate (22) and a connecting plate transmission assembly, the connecting plate transmission assembly includes a first connecting plate (24) and A second connecting plate (25) hinged to the first connecting plate (24), an end of the first connecting plate (24) away from the second connecting plate (25) is connected to the first rotating pin (23) The connecting rod (21) is hinged, and the end of the second connecting plate (25) away from the first connecting plate (24) is hinged with the driven side connecting member through a second rotating pin (26), and the connection The plate (22) is provided with a first guide hole (221) for moving the first rotating pin (23) and a second guide hole (222) for moving the second rotating pin (26).
The double-acting transmission device according to claim 1, wherein the connecting plate transmission assembly further comprises a limit guide (27), the limit guide (27) is fixed to the connecting plate (22) For connection, a guide chute (241) capable of cooperating with the limit guide (27) is provided on the first connecting plate (24).
The double-acting transmission device according to claim 2, characterized in that the limit guide (27) is located at the hinge point of the first connecting plate (24) and the second connecting plate (25) and the Between the first rotating pins (23).
The double-acting transmission device according to claim 1, characterized in that the connecting plate (22) is provided with a third guide hole (223) for accommodating the connecting rod (21), and the connecting rod (21 ) Capable of sliding along the third guide hole (223).
The double-acting transmission device according to claim 4, characterized in that the connecting plate (22) is provided with a fourth guide hole (224) for accommodating the driven-side connecting member (3), the fourth guide The center lines of the hole (224), the first guide hole (221), the second guide hole (222) and the third guide hole (223) are arranged in parallel.
The double-acting transmission device according to claim 1, characterized in that the guide chute (241) is a straight chute.
The double-acting transmission device according to any one of claims 2-6, characterized in that there are two connecting plate transmission assemblies, and two of the connecting plate transmission assemblies are arranged on the connecting plate (22) On opposite sides, there are two connecting rods (21), and the two connecting rods (21) respectively correspond to the two first connecting plates (24).
The double-acting transmission device according to claim 7, characterized in that the two limit guides (27) are coaxially symmetrical on opposite sides of the connecting plate (22), respectively.
The double-acting transmission device according to claim 7, characterized in that two limit guides (27) are distributed on opposite sides of the second guide hole (222).
The double-acting transmission device according to claim 1, wherein the angle between the first connecting plate (24) and the center line of the first guide hole (221) is a;

When the angle a in the initial state of opening is less than 45 °, the follower arc contact (33) and the active side connector (1) move in the same direction first and then in the reverse direction when opening;

When the angle a in the initial state of the opening is greater than 45 °, the driven arc contact (33) and the active-side connector (1) move in the opposite direction at the same time when opening.
The double-acting transmission device according to claim 10, characterized in that the first connecting plate (24) changes with the angle a during rotation, and the first rotation pin (23) reaches the point X at the maximum transmission ratio , Where point X is the movement of the first rotating pin (23) in the slide rail (221) to the position with the shortest distance from the rotating shaft (27), the formula for the transmission ratio is:
Where n is the variable ratio, L is the length of the first connecting plate (24), and S is the distance from the limit guide (27) to the X point.
A circuit breaker, including a driven-side connector (3), an active-side connector (1) and a double-acting transmission device (2), characterized in that the double-acting transmission device (2) is claims 1-11 The double-acting transmission device (2) according to any one of the items.