阅读说明：本技术 一种真空断路器及其电控永磁双稳态操作机构 (Vacuum circuit breaker and electric control permanent magnet bistable operating mechanism thereof ) 是由 郜志 杨海运 甄利 苗俊杰 宫艳朝 王荷生 董宇 王雷雷 于 2021-08-19 设计创作，主要内容包括：本发明属于电气设备技术领域,公开了一种真空断路器及其电控永磁双稳态操作机构。电控永磁双稳态操作机构包括：固定且相对设置的上吸力单元与下吸力单元,各吸力单元均具有轭铁、永磁铁和励磁线圈；所述永磁铁和励磁线圈均位于所述轭铁内；动铁芯,移动地设置于所述上吸力单元和下吸力单元之间；传动杆,设置于所述动铁芯上以由所述动铁芯带动移动,所述传动杆的一端穿设于所述上吸力单元,并与绝缘连杆连接。真空断路器包括：永磁机构,为上述电控永磁双稳态操作机构；绝缘拉杆,一端与所述永磁机构连接,另一端与真空断路器的灭弧室的动触头连接。通过上述方案使得本机构具有结构简单,易加工且成本低,控制方便,运行稳定等优点。(The invention belongs to the technical field of electrical equipment, and discloses a vacuum circuit breaker and an electric control permanent magnet bistable operating mechanism thereof. The electronic control permanent magnet bistable operating mechanism comprises: the suction unit comprises an upper suction unit and a lower suction unit which are fixed and arranged oppositely, and each suction unit is provided with a yoke iron, a permanent magnet and an excitation coil; the permanent magnet and the excitation coil are both positioned in the yoke iron; the movable iron core is movably arranged between the upper suction unit and the lower suction unit; and the transmission rod is arranged on the movable iron core so as to be driven by the movable iron core to move, and one end of the transmission rod penetrates through the upper suction unit and is connected with the insulating connecting rod. The vacuum circuit breaker includes: the permanent magnet mechanism is the electric control permanent magnet bistable operating mechanism; and one end of the insulating pull rod is connected with the permanent magnetic mechanism, and the other end of the insulating pull rod is connected with a moving contact of an arc extinguish chamber of the vacuum circuit breaker. Through the scheme, the mechanism has the advantages of simple structure, easiness in processing, low cost, convenience in control, stability in operation and the like.)

1. An electrically controlled permanent magnet bistable operating mechanism, said mechanism comprising:

fixed and relative last suction unit and the lower suction unit that sets up, each suction unit all has: a yoke, a permanent magnet and an excitation coil; the permanent magnet and the excitation coil are both positioned in the yoke iron;

the movable iron core is movably arranged between the upper suction unit and the lower suction unit;

and the transmission rod is arranged on the movable iron core so as to be driven by the movable iron core to move, and one end of the transmission rod penetrates through the upper suction unit and is connected with the insulating connecting rod.

2. An electrically controlled permanent magnet bistable operating mechanism according to claim 1, wherein said mechanism further comprises:

and the closing buffer spring is positioned in the upper suction unit, and one end of the closing buffer spring is connected with the upper suction unit.

3. The electric control permanent magnet bistable operating mechanism according to claim 1 or 2, wherein the other end of the transmission rod is inserted into the lower suction unit and connected with a position switch, and the position switch is used for representing the contact position information of the arc extinguish chamber of the circuit breaker.

4. An electrically controlled permanent magnet bistable operating mechanism according to claim 3, wherein said mechanism further comprises:

and the brake separating buffer spring is positioned in the lower suction unit, and one end of the brake separating buffer spring is connected with the lower suction unit.

5. The electrically controlled permanent magnet bistable operating mechanism according to claim 1, wherein a side of said plunger facing said upper suction unit is provided with a first recess, and when closing, said first recess receives a portion of the excitation coil of said upper suction unit.

6. The electrically controlled permanent magnet bistable operating mechanism according to claim 5, wherein said plunger is provided with a second recess on a side facing said lower suction unit, said second recess receiving a portion of the excitation coil of said lower suction unit when opening.

7. The electrically controlled permanent magnet bistable operating mechanism according to claim 1, wherein said permanent magnet is sleeved outside said transmission rod and inside said excitation coil.

8. The electrically controlled permanent magnet bistable operating mechanism according to claim 3, wherein said transmission rod is divided into an upper transmission rod and a lower transmission rod;

the upper transmission rod is arranged on one side of the movable iron core facing the upper suction unit;

the lower transmission rod is arranged on one side, facing the lower suction unit, of the movable iron core, and the other end of the lower transmission rod penetrates through the lower suction unit.

9. An electrically controlled permanent magnet bistable operating mechanism according to claim 1, wherein said mechanism further comprises:

the connecting sleeve is annular and is sleeved outside the upper suction unit and the lower suction unit.

10. A vacuum interrupter, characterized in that the vacuum interrupter comprises:

a permanent magnet mechanism, which is an electrically controlled permanent magnet bistable operating mechanism according to any one of the above claims 1-9;

and one end of the insulating pull rod is connected with the permanent magnet mechanism, and the other end of the insulating pull rod is connected with a moving contact of an arc extinguish chamber of the vacuum circuit breaker.

11. Vacuum circuit breaker according to claim 10, characterized in that the closing buffer spring located in the upper suction unit of the electrically controlled permanent magnet bistable operating mechanism is replaced by a contact pressure spring of the arc chute of the vacuum circuit breaker.

Technical Field

The invention belongs to the technical field of electrical equipment, and particularly relates to a vacuum circuit breaker and an electric control permanent magnet bistable operating mechanism thereof.

Background

In the permanent magnet mechanism in the prior art, a permanent magnet is used as a magnetic pole, an iron core is used as an action component, under the action of an excitation coil, the iron core is separated from the attraction of one permanent magnet magnetic pole and moves to the other permanent magnet magnetic pole, so that the permanent magnet mechanism is changed from one stable state to the other stable state, and the iron core outputs linear motion. When the magnetic field is changed, the iron core moves from one magnetic pole position to the other magnetic pole position. In the process, the internal magnetic characteristics of the two permanent magnets are unchanged, only under the action of superposition of magnetic fields of the excitation coils, one magnetic field is reduced, the other magnetic field is increased, and the iron core is attracted from one position to the other position. After the excitation is finished, the attraction between the iron core and the near magnet is far larger than that of the far magnet, and the iron core can be kept in a stable state under the attraction of the near magnet.

Although the theory is, the actual permanent magnet mechanism produced according to the theory has the disadvantages of complex structure, difficult processing, high cost, inconvenient control and poor operation stability.

Disclosure of Invention

In order to solve the above problem, an aspect of the present invention provides an electrically controlled permanent magnet bistable operating mechanism, including:

fixed and relative last suction unit and the lower suction unit that sets up, each suction unit all has: a yoke, a permanent magnet and an excitation coil; the permanent magnet and the excitation coil are both positioned in the yoke iron;

the movable iron core is movably arranged between the upper suction unit and the lower suction unit;

and the transmission rod is arranged on the movable iron core so as to be driven by the movable iron core to move, and one end of the transmission rod penetrates through the upper suction unit and is connected with the insulating connecting rod.

In the electrically controlled permanent magnet bistable operating mechanism as described above, optionally, the mechanism further comprises:

and the closing buffer spring is positioned in the upper suction unit, and one end of the closing buffer spring is connected with the upper suction unit.

In the electrically controlled permanent magnet bistable operating mechanism, optionally, the other end of the transmission rod penetrates through the lower suction unit and is connected with a position switch, and the position switch is used for representing the contact position information of the arc extinguish chamber of the circuit breaker.

In the electrically controlled permanent magnet bistable operating mechanism as described above, optionally, the mechanism further comprises:

and the brake separating buffer spring is positioned in the lower suction unit, and one end of the brake separating buffer spring is connected with the lower suction unit.

In the electrically controlled permanent magnet bistable operating mechanism, optionally, a first groove is provided on a side of the movable iron core facing the upper suction unit, and a part of the excitation coil of the upper suction unit is accommodated in the first groove when the switch is turned on.

In the electrically controlled permanent magnet bistable operating mechanism as described above, optionally, a second groove is provided on a side of the movable iron core facing the lower suction unit, and a part of the excitation coil of the lower suction unit is accommodated in the second groove when the brake is switched off.

In the electrically controlled permanent magnet bistable operating mechanism as described above, optionally, the permanent magnet is sleeved outside the transmission rod and located inside the excitation coil.

In the electrically controlled permanent magnet bistable operating mechanism as described above, optionally, the transmission rod is divided into an upper transmission rod and a lower transmission rod;

the upper transmission rod is arranged on one side of the movable iron core facing the upper suction unit;

the lower transmission rod is arranged on one side, facing the lower suction unit, of the movable iron core, and the other end of the lower transmission rod penetrates through the lower suction unit.

In the electrically controlled permanent magnet bistable operating mechanism as described above, optionally, the mechanism further comprises:

the connecting sleeve is annular and is sleeved outside the upper suction unit and the lower suction unit.

Another aspect of the present invention provides a vacuum circuit breaker, including:

the permanent magnet operating mechanism is the electric control permanent magnet bistable operating mechanism;

one end of the insulating pull rod is connected with the permanent magnet mechanism, and the other end of the insulating pull rod is connected with a moving contact of an arc extinguish chamber of the vacuum circuit breaker.

In the vacuum circuit breaker as described above, optionally, the closing buffer spring located in the upper suction unit of the electrically controlled permanent magnet bistable operating mechanism is replaced by a contact pressure spring of the arc extinguishing chamber of the vacuum circuit breaker.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

through setting up suction unit, lower suction unit, moving iron core and transfer line, go up the fixed setting of suction unit and lower suction unit and both are relative, move the iron core be located the suction unit with between the lower suction unit and relative last suction unit or lower suction unit remove, the transfer line sets up on moving the iron core in order to be driven by moving the iron core and remove, and the one end of transfer line is worn to locate the suction unit and is connected with insulating connecting rod for this automatically controlled bistable state operating device of permanent magnetism's simple structure, workable and with low costs, control is convenient, and the operation is stable.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electrically controlled permanent magnet bistable operating mechanism (in a closing state) according to an embodiment of the present invention.

Fig. 2 is a schematic closing excitation diagram of an electrically controlled permanent magnet bistable operating mechanism (in a closing state) according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of an electrically controlled permanent magnet bistable operating mechanism (in a switching-off state) according to an embodiment of the present invention.

Fig. 4 is a schematic opening excitation diagram of an electrically controlled permanent magnet bistable operating mechanism (in an opening state) according to an embodiment of the present invention.

The symbols in the figures are as follows:

1-an upper transmission rod, 2-an upper yoke, 3-a closing buffer spring, 4-a closing permanent magnet, 5-a closing excitation coil, 6-a connecting sleeve, 7-a movable iron core, 8-a separating buffer spring, 9-a separating permanent magnet, 10-a separating excitation coil, 11-a lower yoke, 12-a lower transmission rod, 13-a screw, an N pole of an N-permanent magnet pole, an S pole of an S-permanent magnet pole, an N pole of a magnetic line magnetic pole of an N-excitation coil, and an S pole of a magnetic line magnetic pole of an S-excitation coil.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.

In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.

Referring to fig. 1 to 4, an embodiment of the present invention provides an electrically controlled permanent magnet bistable operating mechanism, which includes: the upper suction unit, the lower suction unit, the movable iron core 7 and the transmission rod.

The upper suction unit and the lower suction unit are disposed opposite to each other, and as shown in fig. 1, they are disposed opposite to each other in the vertical direction, and at the same time, they are used as a unit for providing suction to the movable iron core 7, and need to be stationary, that is, they need to be fixedly disposed. Each of the suction units has: yoke, permanent magnet and excitation coil. The permanent magnet and the excitation coil are both positioned in the yoke. Accordingly, for the upper suction unit, it comprises: the permanent magnet switching device comprises an upper yoke iron 2, an upper permanent magnet (or called a switching-on permanent magnet 4) and an upper excitation coil (or called a switching-on excitation coil 5). For the downdraft unit, it includes: the lower yoke iron 11, the lower permanent magnet (or brake-separating permanent magnet 9) and the lower excitation coil (or brake-separating excitation coil 10). In order to realize that the upper suction unit and the lower suction unit simultaneously provide suction in opposite directions, the magnet exciting coil of the upper suction unit is connected with the magnet exciting coil of the lower suction unit in series or in parallel in an opposite direction. The movable iron core 7 is arranged between the upper suction unit and the lower suction unit, and is movable relative to the upper suction unit or the lower suction unit, and the moving direction is the connecting direction of the upper suction unit and the lower suction unit, such as the vertical direction in fig. 1. The transmission rod is arranged on the movable iron core 7 and penetrates through the upper suction unit, so that one end of the transmission rod is exposed out of the upper suction unit to be connected with the insulating connecting rod, and then the transmission rod can move under the driving of the movable iron core 7, so that the insulating connecting rod is driven to move, the moving of the moving contact is realized, and the switching-on or switching-off is realized. The permanent magnet may have a height per se in the attraction unit higher than a height per se of the exciting coil in the attraction unit. The end surface of the permanent magnet facing the movable iron core 7 is flush with the end surface of the yoke facing the movable iron core 7.

During the closing operation, the closing magnet exciting coil 5 and the opening magnet exciting coil 10 are simultaneously electrified, the closing magnet exciting coil 5 is electrified with forward current, the direction of the magnetic line is the same as that of the magnetic line of the closing permanent magnet 4, the upper magnetic field is enhanced, and the movable iron core 7 is subjected to stronger upward attraction force. Meanwhile, the opening magnet exciting coil 10 is electrified with reverse current, the direction of the magnetic line is opposite to that of the opening permanent magnet 9, the lower magnetic field is weakened, the downward attraction force on the movable iron core 7 is greatly weakened and even is zero, under the assistance of the attraction force of the closing magnet exciting coil 5 and the closing permanent magnet 4, the movable iron core 7 moves upwards, the transmission rod drives the insulating connecting rod to move upwards, then the moving contact of the arc extinguish chamber is driven to move upwards, after the closing action is finished, the control unit automatically cuts off the exciting current of the opening exciting coil 10 and the exciting current of the closing exciting coil 5, the moving iron core 7 is kept at the closing position by the suction force of the closing permanent magnet 4, at this time, although the opening permanent magnet 9 also shows magnetism, since it is far from the movable iron core 7 with respect to the closing permanent magnet 4, the attraction force to the movable iron core 7 is far smaller than that of the closing permanent magnet 4, so that the position maintenance of the movable iron core 7 is not interfered.

When the brake is opened, the closing magnet exciting coil 5 and the opening magnet exciting coil 10 are simultaneously electrified, the opening magnet exciting coil 10 is electrified with forward current, the direction of the magnetic line is the same as that of the magnetic line of the opening permanent magnet 9, the lower magnetic field is enhanced, and the movable iron core 7 is subjected to stronger downward attraction force. Meanwhile, reverse current is introduced into the closing magnet exciting coil 5, the direction of the magnetic line is opposite to that of the closing permanent magnet 4, the upper magnetic field is weakened, the upward attraction force on the movable iron core 7 is greatly weakened and even is zero, under the assistance of the excitation of the opening magnet exciting coil 10 and the attraction of the opening permanent magnet 9, the movable iron core 7 moves downwards, the insulating connecting rod is driven to move downwards by the transmission rod, then the moving contact of the arc extinguish chamber is driven to move downwards, after the switching-off action is finished, the control unit automatically cuts off the exciting current of the switching-off exciting coil 10 and the switching-on exciting coil 5, the moving iron core 7 is kept at the switching-off position by means of the suction force of the switching-off permanent magnet 9, at this time, although the closing permanent magnet 4 also shows magnetism, since it is far from the plunger 7 with respect to the opening permanent magnet 9, the attraction force to the movable iron core 7 is far smaller than that of the opening permanent magnet 9, so that the interference to the position maintenance of the movable iron core 7 is avoided.

Through setting up the suction unit, the power unit is inhaled down, move iron core 7 and transfer line, go up the fixed setting of suction unit and lower suction unit and both are relative, move iron core 7 and be located between power unit and the lower suction unit and relative last suction unit or lower suction unit removal, the transfer line sets up on moving iron core 7 in order to drive the removal by moving iron core 7, the one end of transfer line is worn to locate the suction unit in order to be connected with insulating connecting rod, make this automatically controlled permanent magnetism bistable operating mechanism's simple structure, workable and with low costs, control is convenient, the operation is stable.

When closing a floodgate, instantaneous impact force is great, especially when being close to the closed end position, in order to reduce closing speed, buffering mechanical impact force, this automatically controlled permanent magnetism bistable operating mechanism still includes: and a closing buffer spring 3 disposed in the upper suction unit, wherein one end of the closing buffer spring 3 is connected to the yoke of the upper suction unit, so that the closing buffer spring 3 is compressed by the upward movement of the transmission rod when closing. And the closing speed is reduced under the action of the closing buffer spring 3. When the switching-on state is switched to the switching-off state, the transmission rod moves downwards, at the moment, the switching-on buffer spring 3 releases the assistance force for moving the movable iron core 7 downwards, namely, the movable iron core 7 moves downwards under the excitation of the switching-off excitation coil 10, the suction force of the switching-off permanent magnet 9 and the assistance force of the switching-on buffer spring 3, and the running stability of the mechanism is improved. Specifically, an upper shoulder may be formed on the body of the transmission rod, an upper groove is formed on one side of the upper yoke 2 facing the movable iron core 7, an upper through hole penetrating through the upper yoke 2 is formed at the bottom of the upper groove, the shoulder is movably disposed in the upper groove, one end of the closing buffer spring 3 is connected with the bottom of the upper groove, the outer diameter of the closing buffer spring 3 is larger than the inner diameter of the upper through hole, the upper end of the body of the transmission rod penetrates through the upper through hole to be connected with the insulating connecting rod, and the lower end of the body of the transmission rod is connected with the movable iron core 7. In other embodiments, the closing buffer spring 3 may be located in the upper suction unit by being connected to the driving rod. When the closing buffer spring 3 is in a switching-off state, the free length of the closing buffer spring can be smaller than the distance between the groove bottom of the upper groove and the upper end face of the upper shaft shoulder. When the opening buffer spring 8 is in a closing state, the free length of the opening buffer spring can be smaller than the distance between the groove bottom of a lower groove formed on one side of the lower yoke 11 facing the movable iron core 7 and the lower end face of a lower shaft shoulder formed on the body of the transmission rod, and the lower shaft shoulder and the upper shaft shoulder are respectively arranged on two sides of the movable iron core 7.

In order to facilitate timely understanding of whether the state of the mechanism is an opening state or a closing state, the other end of the transmission rod penetrates through the lower suction unit and is connected with the position switch, the position switch is used for representing contact position information of an arc extinguish chamber of the circuit breaker, when the other end of the transmission rod is in contact with the first position switch, the transmission rod can represent that the transmission rod is in the closing state, and when the other end of the transmission rod is in contact with the second position switch, the transmission rod can represent that the transmission rod is in the opening state.

When separating brake, the instantaneous impact force is great, especially when being close to the final position of separating brake, in order to reduce separating brake speed, cushions mechanical impact force, this automatically controlled permanent magnetism bistable operating device still includes: and the brake separating buffer spring 8 is arranged in the lower suction unit, and one end of the brake separating buffer spring 8 is connected with the yoke of the lower suction unit, so that the brake separating buffer spring 8 can be compressed due to the downward movement of the transmission rod during brake separating. And the opening speed is reduced under the action of the opening buffer spring 8. When the switching-off state is switched to the switching-on state, the transmission rod moves upwards, the switching-off buffer spring 8 releases the assistance for moving the movable iron core 7 upwards, namely, the movable iron core 7 moves upwards under the excitation of the switching-on excitation coil 5, the attraction force of the switching-on permanent magnet 4 and the assistance of the switching-off buffer spring 8, and the running stability of the mechanism is improved. In other embodiments, the opening buffer spring 8 can be located in the lower suction unit by being connected to the transmission rod. It should be noted that the opening buffer spring 8 may be in a free state, i.e., in an uncompressed state, when in the closing state or when the closing buffer spring 3 is in the opening state. The closing buffer spring 3 is connected with the yoke of the transmission rod or the upper suction unit, and the opening buffer spring 8 is connected with the transmission rod or the lower suction unit, which may be in butt connection, i.e. contact connection, or may be in welding connection, and the embodiment does not limit this.

In order to further improve the assisting power in the closing state, the movable iron core 7 of the electrically controlled permanent magnet bistable operating mechanism is provided with a first groove on the side facing the upper suction unit, and the first groove is used for accommodating a part of the excitation coil of the upper suction unit, in other words, the other part of the excitation coil is positioned in the upper yoke 2, and in fig. 1, the lower part of the excitation coil is positioned in the first groove. When the switch is in a switch-on state, the lower end of the excitation coil is positioned in the first groove; when the brake is switched off, the lower end of the excitation coil can be positioned in the first groove or spaced from the end face of the first groove where the notch is positioned.

In order to further improve the assisting power in the opening state, the movable iron core 7 of the electrically controlled permanent magnet bistable operating mechanism is provided with a second groove on the side facing the lower suction unit, and the second groove is used for accommodating one part of the excitation coil of the lower suction unit, in other words, the other part of the excitation coil is positioned in the lower yoke 11, and in fig. 1, the lower part of the excitation coil is positioned in the second groove. When the brake is switched off, the upper end of the excitation coil is positioned in the second groove; when the switch is in a switch-on state, the upper end of the excitation coil can be positioned in the second groove or spaced from the end face of the second groove where the notch is positioned. The second groove is located opposite the first groove to provide stability of operation. Both of which are annular.

The permanent magnet is sleeved between the transmission rod and the magnet exciting coil, namely, the transmission rod, the permanent magnet and the magnet exciting coil are arranged in sequence from inside to outside along the radial direction.

The transmission rod is divided into an upper transmission rod 1 and a lower transmission rod 12. The upper transmission rod 1 is arranged on the upper end surface of the movable iron core 7, namely, the movable iron core 7 faces one side of the upper suction unit, and one end (or top end) of the upper transmission rod 1 penetrates through the upper suction unit. The lower transmission rod 12 is arranged on the lower end face of the movable iron core 7, namely, the movable iron core 7 faces one side of the lower suction unit, the lower end of the lower transmission rod 12 penetrates through the lower suction unit, and the two transmission rods are not connected with each other, namely, an interval is reserved between the upper transmission rod 1 and the lower transmission rod 1, so that the upper transmission rod 1 and the lower transmission rod 12 are two independent rod pieces, and the mechanism is favorably assembled. In other embodiments, the upper and lower drive links 1, 12 may be a single integral drive link. The other end of the lower transmission rod 12 is inserted into the lower suction unit. The upper transmission rod 1 and the lower transmission rod 12 are arranged oppositely, so that the moving stability is further improved. Specifically, a first through hole is formed in the movable iron core 7, and the upper transmission rod 1 and the lower transmission rod 12 are both arranged in the first through hole. The lower shaft shoulder is formed on the body of the lower transmission rod 12, a lower groove is formed on one side of the lower yoke 11 facing the movable iron core 7, a lower through hole penetrating through the lower yoke 11 is formed in the bottom of the lower groove, the lower shaft shoulder is movably arranged in the lower groove, the lower end face of the lower shaft shoulder is connected with one end of the opening buffer spring 8, the other end of the opening buffer spring 8 is connected with the groove bottom of the lower groove, the outer diameter of the opening buffer spring 8 is larger than the inner diameter of the lower through hole, the lower end of the body of the lower transmission rod 12 penetrates through the lower through hole to be connected with the insulating connecting rod, and the upper end of the body of the lower transmission rod 12 is connected with the movable iron core 7.

In order to facilitate fixing the upper suction unit and the lower suction unit, the electric control permanent magnet bistable operating mechanism further comprises: and the connecting sleeve 6 is annular, is sleeved outside the upper suction unit and the lower suction unit and is positioned between the two suction units. Specifically, mounting ends, namely an upper mounting end and a lower mounting end, are formed at the yoke edge of the upper suction unit and the yoke edge of the lower suction unit, correspondingly, a suction portion close to the center relative to the mounting ends is formed at the yoke, the height (or called the height) of the suction portion protruding towards one side of the movable iron core 7 is higher than the height of the mounting ends, the upper end and the lower end of the connecting sleeve 6 are located between the two mounting ends, the connecting mode can be bolt connection, and can also be screw 13 connection, as shown in fig. 1, screws 13 are used. The connecting sleeve 6 has an interval with the suction part of the yoke in the radial direction, and the connecting sleeve is made of stainless steel to improve the supporting strength, and the material of the connecting sleeve is different from that of the yoke.

Another embodiment of the present invention provides a vacuum circuit breaker, including: permanent magnetic mechanism and insulating pull rod. The permanent magnet mechanism is the electric control permanent magnet bistable operating mechanism. One end of the insulating pull rod is connected with the permanent magnetic mechanism, and the other end of the insulating pull rod is connected with a moving contact of an arc extinguish chamber of the vacuum circuit breaker to drive the arc extinguish chamber to complete opening and closing actions.

The closing buffer spring 3 in the upper suction unit is replaced by a contact pressure spring of the arc extinguishing chamber of the vacuum circuit breaker, that is, when the electrically controlled permanent magnet bistable operating mechanism is used in a vacuum circuit breaker, the closing buffer spring 3 may not be provided, and its function is replaced by a contact pressure spring of the arc extinguishing chamber of the vacuum circuit breaker.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.