CN111640613A

CN111640613A - Double-coil repulsion force operating mechanism

Info

Publication number: CN111640613A
Application number: CN202010619239.2A
Authority: CN
Inventors: 刘晓明; 姜文涛; 陈海
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2020-09-08

Abstract

The invention relates to a double-coil repulsion operating mechanism, belonging to the field of circuit breaker quick operating mechanisms. The device generates repulsion force by discharging the double coil discs which are connected in series in the reverse direction, and the moving coil disc, the connecting rod and the H-shaped iron core quickly move downwards under the combined action of the repulsion force and the elasticity of the opening spring, so that the opening operation of the circuit breaker is realized. The closing operation of the circuit breaker is realized by energizing the closing coil to generate upward electromagnetic force to drive the movable coil disc, the connecting rod and the H-shaped iron core to rapidly move upwards. And the suction among the permanent magnet, the H-shaped iron core and the shell of the holding unit provides certain opening and closing holding force for the arc extinguish chamber of the circuit breaker. The invention can realize the miniaturization and the intensification of the circuit breaker operating mechanism, can effectively improve the switch opening and closing speed, shorten the arcing time, reduce the ablation of the contact and improve the breaking capacity of the circuit breaker.

Description

Double-coil repulsion force operating mechanism

Technical Field

The invention relates to the technical field of operating mechanisms, in particular to a double-coil repulsion operating mechanism.

Background

In recent years, with the large-scale access of distributed power supplies and energy storage devices, the rapid development of power electronic technology, and the increase of direct current loads, direct current power distribution has received more and more attention. Particularly, direct current systems such as large ship power supply systems, photovoltaic direct current micro-grid systems, urban rail transit power supply systems and the like are developed greatly in certain specific occasions. With the continuous increase of the capacity of the direct current system and the continuous improvement of the voltage level, the indexes of the short-circuit current peak value and the on-off time of the direct current breaker are also continuously improved. Although the traditional mechanical circuit breaker has the advantages of strong load carrying capacity and stable conduction, the response speed is slow, generally about 5-20 ms, and the requirements of occasions needing quick on-off actions cannot be met; the power electronic switch has high response speed, but has overlarge on-state loss and low voltage endurance capability.

The hybrid direct-current circuit breaker requires the quick mechanical switch to realize high-speed separation of contacts, so that the current is convenient to transfer to a transfer branch, and simultaneously requires the quick mechanical switch to obtain the initial speed as large as possible to form an insulation gap as soon as possible so as to resist a very high transient recovery voltage appearing between fractures of the mechanical circuit breaker later. In the current stage, a permanent magnet mechanism is mostly used for the quick mechanical switch, the mechanism and a driving loop have large volume and high cost, and the miniaturization and intensification of the circuit breaker are not facilitated. At present, electromagnetic repulsion force fast mechanical switches at the present stage are mostly in theoretical research and principle prototype stages, no reliable engineering application case exists, and the development and the use of a hybrid direct current circuit breaker are seriously influenced.

Disclosure of Invention

The embodiment of the invention provides a double-coil repulsion operating mechanism which can realize the quick breaking and the quick closing of a circuit breaker and can complete the breaking and closing processes within a few milliseconds. Meanwhile, the unique H-shaped iron core structure can provide enough opening and closing holding force, and the high reliability of the circuit breaker operating mechanism is ensured.

Technical scheme

In a first aspect, an embodiment of the present invention provides a dual-coil repulsion operating mechanism, including a permanent magnetic mechanism unit, a connecting rod, and an electromagnetic repulsion pushing unit; the electromagnetic repulsion force pushing unit is connected with the permanent magnet mechanism unit through the connecting rod; the connecting rod moves downwards rapidly under the drive of the electromagnetic repulsion force pushing unit and the permanent magnetic mechanism unit; the connecting rod is driven by the permanent magnet mechanism unit to move upwards rapidly; when the connecting rod moves upwards or downwards to a certain position, the permanent magnet mechanism unit applies a holding force to the upper and lower fixed position states of the connecting rod; the permanent magnet mechanism unit comprises a closing coil, a permanent magnet, a magnetic conduction ring, an H-shaped iron core, a cushion pad, a holding unit shell and a switching-off spring; the H-shaped iron core is fixed on the connecting rod, and the buffer pad is arranged at the bottom of the shell of the holding unit; the permanent magnet is placed in the holding unit shell and adsorbed on the inner side surface of the holding unit shell; the magnetic conductive ring is adsorbed on the inner side surface of the permanent magnet; the holding unit shell, the permanent magnet and the magnetic conduction ring are coaxial; the closing coil is arranged on the permanent magnet and is close to the upper part of the shell of the holding unit; the opening spring is arranged in a groove in the upper part of the H-shaped iron core and penetrates through the connecting rod.

Further, the electromagnetic repulsion pushing unit comprises a static coil repulsion disc and a moving coil repulsion disc.

Further, the static coil repulsion plate and the dynamic coil repulsion plate are coaxial; the static coil repulsion plate and the holding unit shell are isolated and fastened through a first metal support piece and keep a first distance; the moving coil repulsion plate is fixed with the connecting rod through a fastener; the static coil repulsion plate and the moving coil repulsion plate are both of square structures; the inner parts of the static coil repulsion plate and the dynamic coil repulsion plate are both provided with at least one square conductive coil; and insulating glue is filled between the adjacent conducting coils, the conducting coil leads are connected with an external circuit through the wire outlet grooves of the coil discs, and the moving coil repulsion discs and the static coil repulsion discs are connected in series through conducting wires.

Further, the H-shaped iron core and the connecting rod are fixed together, the permanent magnet and the magnetic conductive ring are arranged side by side, the magnetic conductive ring and the H-shaped iron core maintain a second interval, the base of the holding unit casing and the upper end cover of the holding unit casing are isolated and fastened through a second metal support piece and maintain a third interval, and the H-shaped iron core, the connecting rod, the magnetic conductive ring, the closing coil, the opening spring, the cushion pad and the permanent magnet are arranged inside the holding unit casing.

Furthermore, the permanent magnet is made of a material with certain magnetic adsorption force, and the permanent magnet is in an integral annular shape or formed by arc splicing at intervals of a fourth interval.

Further, the holding unit shell is made of a metal material, the upper end cover of the holding unit shell is square, a circular hole is reserved in the middle of the holding unit shell, the base of the holding unit shell is square, and the circular hole is reserved in the middle of the holding unit shell.

Further, the buffer pad is cylindrical, and the buffer pad material is an insulating rubber material.

The permanent magnetic mechanism unit, the connecting rod and the electromagnetic repulsion pushing unit are effectively combined, the double-coil repulsion operating mechanism for the circuit breaker is simple in structure, high in action speed and high in reliability, the switch opening and closing speed of the switch can be effectively improved, arcing time is shortened, contact ablation is reduced, and the circuit breaker opening and closing capacity is improved. In addition, due to the design of a non-contact annular permanent magnet retaining part, the reliability of the operating mechanism can be ensured by generating enough closing retaining force through the H-shaped iron core, and the maintenance-free annular permanent magnet retaining part becomes a key step for realizing the maintenance-free circuit breaker.

Drawings

Fig. 1 is a basic structure diagram of a double-coil repulsion operating mechanism.

The specific implementation mode is as follows:

the present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Fig. 1 is a basic structure diagram of a double-coil repulsion operation mechanism for a circuit breaker according to a first embodiment of the present invention, and as shown in fig. 1, the double-coil repulsion operation mechanism includes a connection rod 100, a permanent magnet mechanism unit 300, and an electromagnetic repulsion pushing unit 200; wherein, a round hole is arranged between the electromagnetic repulsion force pushing unit 200 and the permanent magnetic mechanism unit 300, and the two are connected through a connecting rod 100; the positions of the electromagnetic repulsion pushing unit 200 and the permanent magnet mechanism unit 300 are arranged up and down, preferably, the electromagnetic repulsion pushing unit 200 is arranged above the permanent magnet mechanism unit 300, and the relative positions of the electromagnetic repulsion pushing unit 200 and the permanent magnet mechanism unit 300 are not limited in the application; the connecting rod 100 moves downwards rapidly under the driving of the electromagnetic repulsion force pushing unit 200; the connecting rod 100 is driven by the permanent magnet mechanism unit 300 to move up rapidly; when the connection rod 100 moves up or down to a certain position, the permanent magnet mechanism unit 300 applies a holding force to the upper and lower fixed position states of the connection rod 100; the permanent magnet mechanism unit 300 comprises a closing coil 301, a permanent magnet 302, a magnetic ring 303, an H-shaped iron core 304, a cushion 305, a holding unit shell 306 and a switching-off spring 307; the H-shaped iron core 304 is fixed on the connecting rod 100, and the cushion 305 is placed at the bottom of the holding unit housing 306; the permanent magnet 302 is placed inside the holding unit casing 306 and is adsorbed on the inner side of the holding unit casing 306; the magnetic conductive ring 303 is adsorbed on the inner side surface of the permanent magnet 302; the unit shell 306, the permanent magnet 302 and the magnetic conduction ring 303 are kept coaxial; the closing coil 301 is arranged on the permanent magnet 302, and the closing coil 301 is close to the upper part of the holding unit shell 306; the opening spring 307 is arranged in a groove at the upper part of the H-shaped iron core 304, and the connecting rod 100 penetrates through the opening spring 307.

The technical scheme has the advantages that the switching-on speed of the operating mechanism is high, the H-shaped iron core can provide enough holding force at the switching-on position of the circuit breaker, the contact cannot be separated under the action of vibration or short-circuit current electric force, and the ablation of the contact when the circuit breaker tolerates the short-circuit current is avoided.

Further, with continued reference to fig. 1, the electromagnetic repulsion pushing unit 200 includes a stationary coil repulsion disk 201, a moving coil repulsion disk 202, a support member 203 and a fastening member 204; wherein the static coil repulsion disk 201 is connected with the holding unit housing 306 through the support member 203; the moving coil repulsion plate 202 and the holding unit shell 306 are separated by a first distance, the first distance needs to be determined according to the opening distance requirement of the arc extinguish chamber of the circuit breaker, for example, if the circuit breaker is 10kV, the distance is 19mm, and the size of the first distance is not limited in the application; the moving coil repulsion plate 202 is fixed on the connecting rod 100 through a fastener 204, the fastener 204 is a metal nut, the material and the shape of the fastener are not limited in the application, and only the moving coil repulsion plate 202 can be fixed on the connecting rod 100; the static coil repulsion plate 201 and the moving coil repulsion plate 202 are coaxial, and the coaxial two can reduce the friction force to ensure that the circuit breaker is stressed uniformly in the motion process; when the circuit breaker connected with the mechanism is opened, the H-shaped iron core 304 is close to the upper end cover of the holding unit shell 306, the static coil repulsion plate 201 and the moving coil repulsion plate 202 are electrified, an eddy current effect is generated between the static coil repulsion plate 201 and the moving coil repulsion plate 202, a downward repulsion force is generated between the two, the connecting rod 100 and the moving coil repulsion plate 202 are acted by the downward repulsion force between the static coil repulsion plate 201 and the moving coil repulsion plate 202 and the downward acting force of the opening spring 307, the connecting rod 100, the moving coil repulsion plate 202 and the H-shaped iron core 304 move downward together, when the connecting rod 100 and the moving coil repulsion plate 202 are contacted with the buffer cushion 305, the speed is reduced until the opening position of the circuit breaker is reached, at the moment, the base of the holding unit shell 306, the H-shaped iron core 304, the magnetic conductive ring 303 and the permanent magnet 302 form a magnetic circuit, the base of the holding unit shell 306 and the H-shaped iron, and the permanent magnet provides a certain opening holding force for the circuit breaker. .

The technical scheme has the advantages that the double-coil repulsion plate mode can provide enough downward repulsion, the operating mechanism is high in brake separating speed, the cushion pad is designed to reduce brake separating bounce, and ablation of the contact when the short-circuit current of the circuit breaker is cut off is avoided.

Further, with continued reference to fig. 1, the H-shaped core 304 is fixed to the connecting rod 100, the permanent magnet 302 is placed side by side with the magnetic conductive ring 303, the magnetic conductive ring 303 and the H-shaped core 304 maintain a second distance, which needs to be determined according to the circuit breaker holding force requirement, for example, the circuit breaker is 10kV, the distance is 1mm, the size of the second distance is not limited in the present application, and the base of the holding unit housing 306 and the upper end cover of the holding unit housing 306 are separately fastened and maintained by a second metal support, and a third distance is required to be determined according to the size requirements of the circuit breaker mechanism, for example, the circuit breaker is 10kV, the distance is 100mm, the size of the third distance is not limited in the present application, and the H-shaped iron core 304, the connecting rod 100, the magnetic conductive ring 303, the closing coil 301, the opening spring 307, the cushion pad 305, and the permanent magnet 302 are disposed inside the holding unit casing 306; when the breaker connected with the mechanism is closed, the H-shaped iron core 304 is close to the base of the holding unit shell 306, by energizing the closing coil 301, the current in the coil generates a rapidly changing magnetic field and magnetic force in space, when the magnetic force generated by the closing coil 301 is greater than the opening maintaining force provided by the permanent magnet 302, the H-shaped iron core 304 starts to move rapidly upward, thereby driving the repulsion plate 202 of the moving coil, the connecting rod 100 and the moving contact of the circuit breaker to move upwards, starting to decelerate after touching the opening spring 307 and continuing to move upwards to the position of the upper end cover of the holding unit shell 306, the movement is stopped by resistance, at the moment, the upper end cover of the holding unit shell 306, the H-shaped iron core 304, the magnetic conduction ring 303 and the permanent magnet 302 form a magnetic circuit, the upper end cover of the holding unit shell 306 and the H-shaped iron core 304 are adsorbed together, the closing operation of the circuit breaker is realized, and the permanent magnet provides a certain closing holding force for the circuit breaker.

Further, with continued reference to fig. 1, the static coil repulsion disk 201 and the moving coil repulsion disk 202 are both square structures; the coil panel is square and is easy to be fixed with the permanent magnet mechanism unit 300; the shells of the static coil repulsion plate 201 and the moving coil repulsion plate 202 are made of insulating materials, the insulating materials are preferably epoxy resin, and the type of the insulating materials is not limited in the application; at least one square conducting coil is arranged in the static coil repulsion plate 201 and the movable coil repulsion plate 202, the conducting coil is preferably made of a copper flat wire, and the type of the conducting coil is not limited in the application; wherein, the insulating cement is filled between every two circles of the wire coils, the insulating cement plays a role in insulating between adjacent wires, preferably yellow wax, and the application does not limit the type of the insulating cement; the static coil repulsion plate 201 and the moving coil repulsion plate 202 are connected in series through a conducting wire, and outer ring leads of the static coil repulsion plate 201 and the moving coil repulsion plate 202 are connected with an external circuit through outlet grooves of the static coil repulsion plate 201 and the moving coil repulsion plate 202; when the breaker is opened, the static coil repulsion plate 201 and the moving coil repulsion plate 202 are electrified through an external circuit.

Further, with continued reference to fig. 1, the permanent magnet 302 is made of a material having a certain magnetic attraction force, the material of the permanent magnet 302 is preferably neodymium iron boron, and the type of the material of the permanent magnet 302 is not limited in the present application; permanent magnet 302 is whole annular, or the arc concatenation of interval fourth distance is constituteed, and the fourth distance needs be confirmed according to circuit breaker divide-shut brake holding power size, and for example the circuit breaker is 10kV, then this distance is 5mm, and this application does not limit to the size of fourth distance.

Further, with continued reference to fig. 1, the holding unit housing 306 is made of a metal material, the upper end cap of the holding unit housing 306 is square, a circular hole is left in the middle, the base of the holding unit housing 306 is square, and a circular hole is left in the middle.

Further, with continued reference to fig. 1, the bumper 305 is cylindrical, the material of the bumper 305 is an insulating rubber material, the material of the bumper 305 is preferably polyurethane, and the type of the material of the bumper 305 is not limited in the present application.

In the embodiment of the invention, the connecting rod, the permanent magnetic mechanism unit and the electromagnetic repulsion pushing unit are effectively combined, so that the opening and closing speed of the switch can be improved, the arcing time is shortened, the ablation of a contact is reduced, and the opening and closing capacity of the circuit breaker is improved. In addition, the unique H-shaped iron core structure can provide enough opening and closing holding force, the high reliability of the circuit breaker operating mechanism is guaranteed, and the maintenance-free operation of the circuit breaker is realized.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A double-coil repulsion force operating mechanism is characterized by comprising a permanent magnetic mechanism unit, a connecting rod and an electromagnetic repulsion force pushing unit; the electromagnetic repulsion force pushing unit is connected with the permanent magnet mechanism unit through the connecting rod; the connecting rod moves downwards rapidly under the driving of the electromagnetic repulsion pushing unit; the connecting rod is driven by the permanent magnet mechanism unit to move upwards rapidly; when the connecting rod moves upwards or downwards to a certain position, the permanent magnet mechanism unit applies a holding force to the upper and lower fixed position states of the connecting rod; the permanent magnet mechanism unit comprises a closing coil, a permanent magnet, a magnetic conduction ring, an H-shaped iron core, a cushion pad, a holding unit shell and a switching-off spring; the H-shaped iron core is fixed on the connecting rod, and the buffer pad is arranged at the bottom of the shell of the holding unit; the permanent magnet is placed in the holding unit shell and adsorbed on the inner side surface of the holding unit shell; the magnetic conductive ring is adsorbed on the inner side surface of the permanent magnet; the holding unit shell, the permanent magnet and the magnetic conduction ring are coaxial; the closing coil is arranged on the permanent magnet and is close to the upper part of the shell of the holding unit; the opening spring is arranged in a groove in the upper part of the H-shaped iron core, and the connecting rod penetrates through the opening spring.

2. The dual-coil repulsion actuating mechanism as claimed in claim 1, wherein said electromagnetic repulsion pushing unit comprises a static coil repulsion disk and a dynamic coil repulsion disk.

3. A dual coil repulsion actuator as set forth in claim 2, wherein said static coil repulsion disk and said dynamic coil repulsion disk are coaxial; the static coil repulsion plate and the holding unit shell are isolated and fastened through a first metal support piece and keep a first distance; the moving coil repulsion plate is fixed with the connecting rod through a fastener; the static coil repulsion plate and the moving coil repulsion plate are both of square structures; the inner parts of the static coil repulsion plate and the dynamic coil repulsion plate are both provided with at least one square conductive coil; the shells of the static coil repulsion plate and the dynamic coil repulsion plate are made of insulating materials; and insulating glue is filled between the adjacent conducting coils, the conducting coil leads are connected with an external circuit through the wire outlet grooves of the coil discs, and the moving coil repulsion discs and the static coil repulsion discs are connected in series through conducting wires.

4. The dual-coil repulsion operating mechanism as set forth in claim 1, wherein said H-shaped iron core is fixed to said connecting rod, said permanent magnet is disposed side by side with said magnetic ring, said magnetic ring is kept at a second distance from said H-shaped iron core, said base of said holding unit housing and said upper end cap of said holding unit housing are fastened in a spaced manner by a second metal support member and kept at a third distance, and said H-shaped iron core, said connecting rod, said magnetic ring, said closing coil, said opening spring, said cushion pad and said permanent magnet are disposed inside said holding unit housing.

5. A twin coil repulsion actuator as defined in claim 4 wherein said permanent magnet is made of a material with a certain magnetic attraction force, said permanent magnet is in the shape of a whole ring or an arc segment with a fourth distance therebetween.

6. The dual coil repulsion actuator as set forth in claim 1, wherein said holder unit housing is made of metal material, the upper end cap of said holder unit housing is square with a circular hole in the middle, the base of said holder unit housing is square with a circular hole in the middle.

7. A dual coil repulsion actuator as set forth in claim 3 wherein said cushion is cylindrical and said cushion material is an insulating rubber material.