CN112614728A

CN112614728A - Three-phase mechanical linkage device for circuit breaker and circuit breaker

Info

Publication number: CN112614728A
Application number: CN202011599671.6A
Authority: CN
Inventors: 居翠翠; 何海波; 崔九同; 王亚鸽
Original assignee: Siemens High Voltage Switchgear Co Ltd
Current assignee: Siemens High Voltage Switchgear Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-04-06

Abstract

The invention relates to a three-phase mechanical linkage device for a circuit breaker and the circuit breaker, wherein the three-phase mechanical linkage device comprises an input connecting rod part and a linkage actuating part, and the linkage actuating part comprises: the phase A transmission rod, the phase B transmission rod and the phase C transmission rod are respectively provided with a first end and a second end connected with an input shaft of the A, B, C phase circuit breaker; the AB phase connecting rod is connected between the first ends of the A phase transmission rod and the B phase transmission rod; and the BC-phase connecting rod is connected between the first ends of the B-phase transmission rod and the C-phase transmission rod, the first end of the input connecting rod part is pivoted with the output crank arm through a first connecting piece for limiting a first rotation axis, the second end is pivoted with a transmission rod through a second connecting piece for limiting a second rotation axis, and the first rotation axis and the second rotation axis form an angle of 90 degrees with each other, so that the output crank arm, the input connecting rod part and the transmission rod form a spatial four-bar mechanism. The technology can realize simultaneous action of three phases, reduces parts, simplifies the structure and reduces the cost.

Description

Three-phase mechanical linkage device for circuit breaker and circuit breaker

Technical Field

The application relates to the field of circuit breakers, in particular to a three-phase mechanical linkage device for a circuit breaker and the circuit breaker.

Background

For the transmission device of the 252kVGIS circuit breaker, a three-phase independent operating mechanism is mostly adopted at present, and common three-phase linkage modes include an electric linkage mode, a hydraulic linkage mode, a mechanical linkage mode and the like. The electric linkage mode and the hydraulic linkage mode have certain limitations because higher opening and closing synchronization performance cannot be provided and the hidden danger of non-full-phase operation of the circuit breaker is caused.

In particular, the electric linkage system is provided with a driving mechanism in each phase arc extinguishing chamber, and controls three phases to be opened and closed simultaneously by using electric signals through a secondary circuit. However, in the process of controlling three-phase opening and closing by the electric linkage mode, due to the difference of the operating power of each phase mechanism and the reaction time of the secondary control component thereof, the synchronism of three-phase opening and closing is not high.

In practical applications, a high-voltage circuit breaker for protecting a transformer needs to be capable of keeping three phases to act simultaneously in any case, namely three-phase linkage. The mechanical linkage mode can improve the problems, for this reason, both national power grid and national energy management require that the 252kV high-voltage circuit breaker should adopt a three-phase mechanical linkage type structure, and the mechanical linkage mode has replaced the electrical linkage mode and is increasingly applied to the 252kV circuit breaker.

However, most of the currently adopted mechanical linkage structures are complex in structure and multiple in parts, which significantly increases the assembly cost and the maintenance cost of the equipment.

Therefore, a three-phase mechanical interlocking structure which can reliably realize simultaneous interlocking of three phases and has a simple structure is required.

Disclosure of Invention

The main objective of the present application is to provide a three-phase mechanical linkage device for a circuit breaker, aiming at solving the problems that the three phases cannot be mechanically linked and the linkage device structure is complex in the prior art.

In order to achieve the above object, according to one aspect of the present application, there is provided a three-phase mechanical linkage for a circuit breaker, including an input link portion, a linkage actuating portion, an a-phase circuit breaker input shaft, a B-phase circuit breaker input shaft, and a C-phase circuit breaker input shaft, the a-phase circuit breaker input shaft, the B-phase circuit breaker input shaft, and the C-phase circuit breaker input shaft being connected to a three-phase internal structure of the circuit breaker through respective first ends, respectively; wherein the linkage actuating portion includes: the phase A transmission rod is provided with a phase A transmission rod first end and a phase A transmission rod second end which is used for being connected with the second end of the phase A breaker input shaft; the phase B transmission rod is provided with a first end of the phase B transmission rod and a second end of the phase B transmission rod which is used for being connected with the second end of the input shaft of the phase B circuit breaker; the phase C transmission rod is provided with a first end of the phase C transmission rod and a second end of the phase C transmission rod, and the second end of the phase C transmission rod is connected with the second end of the input shaft of the phase C circuit breaker; the AB phase connecting rod is connected between the first end of the A phase transmission rod and the first end of the B phase transmission rod; and a BC phase connecting rod connected between the first end of the B phase transmission rod and the first end of the C phase transmission rod, wherein, the first end of the input connecting rod part is pivoted with an output crank arm on a driving shaft of an external driving mechanism through a first connecting piece, the input link portion and the output link are pivotable relative to each other about a first axis of rotation defined by the first link, the second end of the input connecting rod part is pivoted with one of the phase A transmission rod, the phase B transmission rod and the phase C transmission rod through a second connecting piece, the input link portion and the one drive link are pivotable relative to each other about a second axis of rotation defined by the second link, and wherein the first and second axes of rotation are arranged at 90 degrees to each other such that the input link portion and the one transfer bar form a spatial four-bar linkage with the output crank arm.

The three-phase mechanical linkage structure comprising the input connecting rod part and the linkage actuating part is arranged, so that the three-phase simultaneous opening and closing of the circuit breaker are realized. This three-phase mechanical linkage structure adopts space four-bar linkage to carry out the motion transmission in order to realize that the three-phase opens and shuts simultaneously, and this makes spare part reduction, structure obtain simplifying, has reduced cost and assembly complexity simultaneously.

Further, the A-phase transmission rod, the AB-phase connection rod and the B-phase transmission rod form a first parallel four-bar linkage mechanism, the B-phase transmission rod, the BC-phase connection rod and the C-phase transmission rod form a second parallel four-bar linkage mechanism, wherein the output crank arm of the external driving mechanism actuates the input connecting rod part and the transmission rod to move, so that the movement of the transmission rod drives the AB-phase connection rod, the BC-phase connection rod and the other two transmission rods to be rotationally linked, and the linkage of the three transmission rods is respectively transmitted to the A-phase circuit breaker input shaft, the B-phase circuit breaker input shaft and the C-phase circuit breaker input shaft which are connected to the three-phase internal structure of the circuit breaker, so that the three phases of the circuit breaker are simultaneously closed or disconnected.

Implementing the linkage actuator as two parallel four-bar linkages enables a better and more efficient transfer of motion from the spatial four-bar linkage, which further simplifies and makes the structure compact.

Further, the input connecting rod part comprises a first joint, an input connecting rod body and a second joint, the input connecting rod body is arranged between the first joint and the second joint, and the first joint and the input connecting rod body and the second joint are connected in a threaded connection mode, so that the length of the input connecting rod part can be adjusted by screwing the first joint and the input connecting rod body towards or away from each other and/or screwing the input connecting rod body and the second joint towards or away from each other.

Set up to connecting through the threaded connection mode between first joint, the input connecting rod body and the second joint for can realize the regulation to the overtravel of circuit breaker, and have two threaded connection portion between the three part, this makes and to adjust the overtravel more nimble.

Furthermore, the phase A drive rod has a first arm and a second arm, one end of the first arm is the first end of the phase A drive rod, the other end of the first arm is the second end of the phase A drive rod, wherein the second end of the phase A drive rod is the common end of the first arm and the second arm, the second arm further has a third end of the phase A drive rod, and the second end of the input connecting rod is pivoted to the third end of the phase A drive rod.

The phase-a transfer lever can be connected to the phase-AB link, the phase-a breaker input shaft, and the input link portion through three end portions thereof, respectively, and it assumes a function of simultaneously transferring motion from the spatial four-link mechanism to both the linkage actuating portion and the phase-a breaker, which makes the structure have a high degree of integration, and makes the structure compact, space-saving.

Further, the AB phase link and the BC phase link are formed as one body.

The AB-phase link and the BC-phase link are integrally formed, so that the transmission of motion from the spatial four-link mechanism can be more reliably realized, and the linkage of the two parallel four-link mechanisms can be further effectively realized.

Further, the first connecting piece and the second connecting piece are both joint bearings.

The knuckle bearing is a common part that can effectively achieve mutual pivotal movement between components, is readily available, and is low cost and effective.

Further, the three-phase mechanical linkage for the circuit breaker further includes a first cylindrical pin, a second cylindrical pin, and a third cylindrical pin, the phase a transmission rod and the phase AB link rod are connected to each other through the first cylindrical pin and can rotate with respect to each other, the phase AB link rod, the phase B transmission rod, and the phase BC link rod are connected to each other through the second cylindrical pin and the phase B transmission rod can rotate with respect to the phase AB link rod and the phase BC link rod, respectively, and the phase BC link rod and the phase C transmission rod are connected to each other through the third cylindrical pin and can rotate with respect to each other.

The cylindrical pin can realize reliable connection among all parts and has low cost.

Further, a three-phase mechanical linkage for circuit breaker still includes first spline, second spline and third spline, the a looks transfer lever with the a looks circuit breaker input shaft passes through first spline is connected each other so that the motion of a looks transfer lever causes the corresponding motion of a looks circuit breaker input shaft, the B looks transfer lever with the B looks circuit breaker input shaft passes through the second spline is connected each other so that the motion of B looks transfer lever causes the corresponding motion of B looks circuit breaker input shaft, and the C looks transfer lever with the C looks circuit breaker input shaft passes through the third spline is connected each other so that the motion of C looks transfer lever causes the corresponding motion of C looks circuit breaker input shaft.

Through connecting the three-phase transmission rod with the input shaft of the three-phase circuit breaker through a spline, the motion of the parallel four-bar linkage mechanism can be effectively transmitted to the interior of the circuit breaker, and the circuit breaker is further opened and closed.

According to another aspect of this application, still provide a circuit breaker, the circuit breaker includes circuit breaker body, actuating mechanism and the above-mentioned three-phase mechanical linkage who is used for the circuit breaker, wherein, a three-phase mechanical linkage for the circuit breaker set up in the circuit breaker body with between the actuating mechanism.

Because the circuit breaker comprises the three-phase mechanical linkage structure, the three-phase opening and closing of the circuit breaker can be realized simultaneously, and the circuit breaker is simplified in structure, simple to assemble and low in cost.

Further, the driving mechanism is a spring operating mechanism.

The spring operating mechanism is a commonly used driving mechanism in linkage equipment, and three phases are actuated by adopting one spring operating mechanism as the driving mechanism, so that the structure can be further simplified.

By applying the technical scheme of the application, the spatial transmission kinematic chain in the spatial four-bar form is adopted to transmit motion, so that the motion transmission and the simultaneous action of three phases can be reliably realized, and meanwhile, the spatial motion transmission mode is adopted, so that the number of parts is reduced, the assembly is simple, the structure is simplified, and the cost and the maintenance complexity are further reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

figure 1 illustrates a side view of a circuit breaker according to the present application;

figure 2 shows a perspective view of a circuit breaker according to the present application;

fig. 3 illustrates a side view of a three-phase mechanical linkage for a circuit breaker according to the present application; and

fig. 4 illustrates a top view of a three-phase mechanical linkage for a circuit breaker according to the present application.

Wherein the figures include the following reference numerals:

the three-phase mechanical linkage structure 10, the circuit breaker body 20 and the spring operating mechanism 30;

the device comprises an output crank arm 11, a first joint 12, an input connecting rod body 13, a second joint 14, a first connecting piece 15 and a second connecting piece 16;

phase A drive rod 21, phase B drive rod 22, phase C drive rod 23, phase AB connecting rod 24, and phase BC connecting rod 25;

phase A breaker input shaft 31, phase B breaker input shaft 32, phase C breaker input shaft 33

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to an aspect of the present application, there is provided a three-phase mechanical linkage for a circuit breaker, the three-phase mechanical linkage for a circuit breaker including an input link portion, a linkage actuating portion, an a-phase circuit breaker input shaft, a B-phase circuit breaker input shaft, and a C-phase circuit breaker input shaft, the a-phase circuit breaker input shaft, the B-phase circuit breaker input shaft, and the C-phase circuit breaker input shaft being connected to a three-phase internal structure of the circuit breaker through respective first ends, respectively; wherein the linkage actuating portion includes: the phase A transmission rod is provided with a phase A transmission rod first end and a phase A transmission rod second end which is used for being connected with the second end of the phase A breaker input shaft; the phase B transmission rod is provided with a first end of the phase B transmission rod and a second end of the phase B transmission rod which is used for being connected with the second end of the input shaft of the phase B circuit breaker; the phase C transmission rod is provided with a first end of the phase C transmission rod and a second end of the phase C transmission rod, and the second end of the phase C transmission rod is connected with the second end of the input shaft of the phase C circuit breaker; the AB phase connecting rod is connected between the first end of the A phase transmission rod and the first end of the B phase transmission rod; and a BC phase connecting rod connected between the first end of the B phase transmission rod and the first end of the C phase transmission rod, wherein, the first end of the input connecting rod part is pivoted with an output crank arm on a driving shaft of an external driving mechanism through a first connecting piece, the input link portion and the output link are pivotable relative to each other about a first axis of rotation defined by the first link, the second end of the input connecting rod part is pivoted with one of the phase A transmission rod, the phase B transmission rod and the phase C transmission rod through a second connecting piece, the input link portion and the one drive link are pivotable relative to each other about a second axis of rotation defined by the second link, and wherein the first and second axes of rotation are arranged at 90 degrees to each other such that the input link portion and the one transfer bar form a spatial four-bar linkage with the output crank arm.

Figure 1 illustrates a side view of a circuit breaker according to the present application; figure 2 shows a perspective view of a circuit breaker according to the present application; fig. 3 illustrates a side view of a three-phase mechanical linkage for a circuit breaker according to the present application; and figure 4 shows a top view of a three-phase mechanical linkage for a circuit breaker according to the present application.

According to an embodiment of the present application, as shown in fig. 1 and 2, the circuit breaker generally includes a three-phase mechanical linkage 10, a circuit breaker body 20, and a spring operating mechanism 30, wherein the three-phase mechanical linkage 10 is disposed between the circuit breaker body 20 and the spring operating mechanism 30. In use, the spring operating mechanism 30 can be used as a driving mechanism for driving each component of the three-phase mechanical linkage device 10 to realize linkage, and the linkage motion of the components can be further transmitted to three insulating pull rods respectively connected to the insides of three-phase arc-extinguishing chambers of the circuit breaker body 20 through internal transmission rods, and finally, the three insulating pull rods respectively pull one side contact in the three-phase arc-extinguishing chambers to translate so as to be separated from or contacted with the other side contact, so that three phases of the circuit breaker can be simultaneously opened or closed.

Referring to fig. 3 and 4, a side view and a top view, respectively, of the three-phase mechanical linkage 10 are shown. The three-phase mechanical linkage 10 may include an input link portion and a linkage actuating portion, wherein the input link portion may further include a first joint 12, an input link body 13, and a second joint 14, and the linkage actuating portion may further include an a-phase transmission lever 21, a B-phase transmission lever 22, a C-phase transmission lever 23, an AB-phase link 24, and a BC-phase link 25.

As shown in fig. 4, a first end of the input link portion, i.e., one end of the first joint 12, may be connected to the output crank arm 11 on the output shaft of the spring operating mechanism 30 through a first connection member 15, and a second end of the input link portion, i.e., one end of the second joint 14, may be connected to the phase a transmission lever 21 of the interlocking actuating portion through a second connection member 16. Of course, the second joint 14 may be connected to other phase transmission rods of the linkage actuator without departing from the scope of the present application. Here, the input link portion and the output link arm 11 are pivotable relative to each other about a first rotation axis defined by the first link 15, respectively, and similarly, the input link portion and the phase-a transfer lever 21 are also pivotable relative to each other about a second rotation axis defined by the second link 16, respectively. As can be seen from comparing fig. 3 and 4, the first rotation axis and the second rotation axis are arranged at 90 degrees different planes from each other. Therefore, in the embodiment of the present application, a spatial four-link mechanism may be formed by the output crank arm 11, the input link portion, and the a-phase transmission lever 21 in combination with a fixed member (not shown, e.g., a stationary frame) connected therebetween. Preferably, the first and second connecting

members

15 and 16 may be joint bearings, and may be other types of connecting members capable of pivotally connecting the input link portion with the output crank arms 11 and a phase transmission lever 21 without departing from the scope of the present application.

In the linked actuation portion, the AB link lever 24 may be connected between the first end of the phase-a transmission lever 21 and the first end of the phase-B transmission lever 22, and the BC link lever 25 may be connected between the first end of the phase-B transmission lever 22 and the first end of the phase-C transmission lever 23. Further, a second end of the a-phase transmission rod 21 may be connected to a second end of the a-phase breaker input shaft 31 of the three-phase mechanical linkage 10, a second end of the B-phase transmission rod 22 may be connected to a second end of the B-phase breaker input shaft 32 of the three-phase mechanical linkage 10, and a second end of the C-phase transmission rod 23 may be connected to a second end of the C-phase breaker input shaft 33 of the three-phase mechanical linkage 10, wherein the a-phase breaker input shaft, the B-phase breaker input shaft, and the C-phase breaker input shaft all open and connect three-phase internal structures and parts of the breaker through respective first ends.

Specifically, the a-phase transmission rod 21 and the AB-phase connection rod 24, the B-phase transmission rod 22 and the BC-phase connection rod 25, and the BC-phase connection rod 25 and the C-phase transmission rod 23 are connected by cylindrical pins and can rotate relative to each other by the cylindrical pins. Of course, other forms of connection that enable pivotal connection of the components may be used without departing from the scope of the present application. Furthermore, it is preferable that the a-phase transmission rod 21 and the a-phase breaker input shaft 31, the B-phase transmission rod 22 and the B-phase breaker input shaft 32, and the C-phase transmission rod 23 and the C-phase breaker input shaft 33 are connected by splines, so that the movement of the three transmission rods correspondingly causes the corresponding movement of the three-phase breaker input shaft, thereby precisely achieving the transmission of the movement.

Thus, in the embodiment of the present application, the first parallel four-bar linkage may be formed by the phase-a transmission lever 21, the phase-AB transmission lever 24, and the phase-B transmission lever 22 in combination with a fixed member (not shown, e.g., a stationary frame) connected therebetween, and the second parallel four-bar linkage may be formed by the phase-B transmission lever 22, the phase-BC transmission lever 25, and the phase-C transmission lever 23 in combination with a fixed member (not shown, e.g., a stationary frame) connected therebetween. In particular, the AB-phase link 24 and the BC-phase link 25 may be separate components or may be formed as one body, but preferably, the AB-phase link 24 and the BC-phase link 25 are always in a straight line without relative rotation during the motion transmission.

Referring again to fig. 4, as described above, the phase a transfer lever 21 may have a first end connected to the AB link 24, a second end connected to the phase a breaker input shaft 31, and a third end through which the phase a transfer lever 21 is pivotally connected to the second joint 14 of the input link portion. The phase a transmission rod 21 has a first end and a second end, and a second end and a third end, wherein the first end and the second end form a first arm therebetween, and the second end is a common end of the first arm and the second arm, and an angle can be formed between the first arm and the second arm.

As can be seen from fig. 3 and 4, the input link body 13 of the input link portion may be disposed between the first joint 12 and the second joint 14, and in the embodiment of the present application, the first joint 12, the input link body 13, and the second joint 14 are always in a straight line. The first connector 12 and the input link body 13 can be connected by a screw connection, and similarly, the input link body 13 and the second connector 14 can be connected by a screw connection, so that the length of the input link portion can be adjusted by screwing the first connector 12 and the input link body 13 toward or away from each other, and the length of the input link portion can also be adjusted by screwing the input link body 13 and the second connector 14 toward or away from each other, thereby realizing appropriate adjustment of the over travel of the circuit breaker to meet the requirements.

The operation of the three-phase mechanical linkage structure according to the embodiment of the present application will be described below.

In operation, the four-bar mechanism can be actuated by a spring operating mechanism as a driving mechanism, and the output crank arm 11 on the output shaft of the spring operating mechanism further drives the input connecting rod part and the phase a transmission rod 21 to move, so that the spatial four-bar mechanism can move in space. The motion of the spatial four-bar linkage is further transferred to the first and second parallel four-bar linkages causing linkage of the first and second parallel four-bar linkages. Specifically, the movement of the phase a transmission lever 21 is transmitted to the phase AB link lever 24 in the same plane, thereby causing rotational linkage of the phase B transmission lever 22, the phase BC link lever 25, and the phase C transmission lever 23. The linkage of the first parallel four-bar linkage mechanism and the second parallel four-bar linkage mechanism is transmitted to an internal structure and parts through three-phase input shafts at the same time, namely, the motion of the three-phase input shafts can be further transmitted to three insulating pull rods respectively connected to the inside of a three-phase arc extinguish chamber through an internal transmission rod piece, and the three insulating pull rods simultaneously pull one side contact in the corresponding arc extinguish chamber to translate so as to be separated from or contacted with the other side contact, so that the three phases of the circuit breaker are simultaneously opened or closed.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A three-phase mechanical linkage for a circuit breaker, characterized in that the three-phase mechanical linkage for a circuit breaker comprises an input link portion, a linkage actuating portion, an A-phase circuit breaker input shaft (31), a B-phase circuit breaker input shaft (32), and a C-phase circuit breaker input shaft (33), the A-phase circuit breaker input shaft (31), the B-phase circuit breaker input shaft (32), and the C-phase circuit breaker input shaft (33) being connected to a three-phase internal structure of the circuit breaker by respective first ends, respectively;

wherein the linkage actuating portion includes:

the phase A transmission rod (21) is provided with a phase A transmission rod first end and a phase A transmission rod second end which is used for being connected with the second end of the phase A breaker input shaft (31);

a phase B transfer lever (22) having a phase B transfer lever first end and a phase B transfer lever second end for connection with a second end of the phase B circuit breaker input shaft (32);

a phase C transfer lever (23) having a phase C transfer lever first end and a phase C transfer lever second end for connection with a second end of the phase C breaker input shaft (33);

the AB phase connecting rod (24) is connected between the first end of the phase A transmission rod and the first end of the phase B transmission rod; and

a BC-phase connecting rod (25) connected between the first end of the B-phase transmission rod and the first end of the C-phase transmission rod,

wherein, the first end of the input connecting rod part is pivoted with an output crank arm (11) on a driving shaft of an external driving mechanism through a first connecting piece (15), the input link portion and the output link are pivotable relative to each other about a first axis of rotation defined by the first link (15), the second end of the input connecting rod part is pivoted with one of the phase A transmission rod (21), the phase B transmission rod (22) and the phase C transmission rod (23) through a second connecting piece (16), the input link portion and the one drive link being pivotable relative to each other about a second axis of rotation defined by the second link (16), and wherein the first and second axes of rotation are arranged at 90 degrees to each other such that the input link portion and the one transmission bar form a spatial four-bar linkage with the output crank arm (11).

2. The three-phase mechanical linkage for a circuit breaker of claim 1,

the phase A transmission rod (21), the phase AB connection rod (24) and the phase B transmission rod (22) form a first parallel four-bar linkage mechanism, and

the phase B transmission rod (22), the phase BC connecting rod (25) and the phase C transmission rod (23) form a second parallel four-bar linkage,

the input connecting rod portion and the transmission rod move through the output crank arm (11) of the external driving mechanism, the transmission rod moves to drive the AB-phase connecting rod (24), the BC-phase connecting rod (25) and two other transmission rods to be in rotary linkage, linkage of the three transmission rods is respectively transmitted to the A-phase circuit breaker input shaft (31), the B-phase circuit breaker input shaft (32) and the C-phase circuit breaker input shaft (33) which are connected to a three-phase internal structure of the circuit breaker, and therefore the three phases of the circuit breaker are closed or opened simultaneously.

3. The three-phase mechanical linkage for a circuit breaker according to claim 1, wherein the input link portion comprises a first joint (12), an input link body (13) and a second joint (14), the input link body is disposed between the first joint and the second joint, and the first joint and the input link body and the second joint are connected by a threaded connection, such that the length of the input link portion can be adjusted by screwing the first joint (12) and the input link body (13) toward or away from each other and/or by screwing the input link body (13) and the second joint (14) toward or away from each other.

4. The three-phase mechanical linkage device for the circuit breaker according to claim 1, wherein the phase a transmission rod (21) has a first arm and a second arm, one end of the first arm is a first end of the phase a transmission rod, the other end of the first arm is a second end of the phase a transmission rod, wherein the second end of the phase a transmission rod is a common end of the first arm and the second arm, and the second arm further has a third end of the phase a transmission rod, and the second end of the input link part is pivoted to the third end of the phase a transmission rod.

5. The three-phase mechanical linkage for a circuit breaker according to claim 1, characterized in that the AB phase link (24) and the BC phase link (25) are formed in one piece.

6. The three-phase mechanical linkage for a circuit breaker according to claim 1, characterized in that said first connection (15) and said second connection (16) are both oscillating bearings.

7. The three-phase mechanical linkage for a circuit breaker according to claim 1, further comprising a first cylindrical pin, a second cylindrical pin, and a third cylindrical pin, wherein the a-phase transmission rod (21) and the AB-phase link rod (24) are connected to each other by the first cylindrical pin and are rotatable with respect to each other, the AB-phase link rod (24), the B-phase transmission rod (22), and the BC-phase link rod (25) are connected to each other by the second cylindrical pin and are rotatable with respect to the AB-phase link rod and the BC-phase link rod, respectively, and the BC-phase link rod (25) and the C-phase transmission rod (23) are connected to each other by the third cylindrical pin and are rotatable with respect to each other.

8. The three-phase mechanical linkage for a circuit breaker of claim 1, the three-phase mechanical linkage for the circuit breaker further comprises a first spline, a second spline and a third spline, the phase A transfer lever (21) and the phase A circuit breaker input shaft (31) are connected to each other by the first spline such that movement of the phase A transfer lever causes a corresponding movement of the phase A circuit breaker input shaft, the phase B transfer lever (22) and the phase B circuit breaker input shaft (32) are connected to each other by the second spline such that movement of the phase B transfer lever causes corresponding movement of the phase B circuit breaker input shaft, and the phase C transfer lever (23) and the phase C breaker input shaft (33) are connected to each other by the third spline such that movement of the phase C transfer lever causes a corresponding movement of the phase C breaker input shaft.

9. A circuit breaker, characterized in that it comprises a circuit breaker body (20), a drive mechanism and a three-phase mechanical linkage (10) for a circuit breaker according to any one of claims 1 to 8, wherein said three-phase mechanical linkage (10) for a circuit breaker is arranged between said circuit breaker body (20) and said drive mechanism.

10. The circuit breaker of claim 9 wherein said drive mechanism is a spring operated mechanism (30).