CN114156122A - Separated magnetic circuit type bistable permanent magnet operating mechanism - Google Patents
Separated magnetic circuit type bistable permanent magnet operating mechanism Download PDFInfo
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- CN114156122A CN114156122A CN202111528027.4A CN202111528027A CN114156122A CN 114156122 A CN114156122 A CN 114156122A CN 202111528027 A CN202111528027 A CN 202111528027A CN 114156122 A CN114156122 A CN 114156122A
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- iron core
- closing
- opening
- magnetic
- permanent magnet
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 104
- 230000007246 mechanism Effects 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 91
- 230000003068 static effect Effects 0.000 claims description 38
- 238000002955 isolation Methods 0.000 claims description 15
- 230000004907 flux Effects 0.000 claims description 11
- 230000005389 magnetism Effects 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims 1
- 229920006362 Teflon® Polymers 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- -1 polytetrafluoroethylene ring Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005292 diamagnetic effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
Abstract
The invention relates to the technical field of electrical design of permanent magnet operating mechanisms, in particular to a separated magnetic circuit type bistable permanent magnet operating mechanism which comprises a retaining mechanism, a closing driving mechanism and an opening driving mechanism, wherein all the mechanisms are connected through a driving rod. Compared with the prior art, the invention has the beneficial effects that: the opening electromagnetic driving magnetic circuit and the closing electromagnetic driving magnetic circuit are isolated, so that mutual interference of the magnetic circuits of all parts in the working process is effectively avoided.
Description
Technical Field
The invention relates to the technical field of electrical design of permanent magnet operating mechanisms, in particular to a separated magnetic circuit type bistable permanent magnet operating mechanism.
Background
With the maturity of vacuum on-off technology, the vacuum circuit breaker has been widely applied in the field of medium voltage distribution networks, and the operating mechanism used by the current vacuum circuit breaker mainly takes a spring operating mechanism as a main part, and then a monostable permanent magnet operating mechanism and a bistable permanent magnet operating mechanism are also provided. The conventional bistable permanent magnetic actuator is shown in fig. 2.
When the permanent magnetic mechanism is in a switching-on position, direct current is conducted in the switching-off coil (4), the magnetic field generated by the current reduces the attraction force borne by the movable iron core, when the current is increased to a certain value, the sum of the attraction forces borne by the movable iron core (2) is smaller than the mechanical load on the movable iron core (1), and the movable iron core moves downwards. And in the downward movement process of the movable iron core, the magnetic resistance at the upper end is increased, and the magnetic resistance at the lower end is reduced. The attraction of the upper magnetic pole of the static iron core to the moving iron core is reduced, and the attraction of the lower magnetic pole to the moving iron core (1) is increased. The downward resultant force of the movable iron core (1) is increased, so that the movable iron core is accelerated to move downwards. This process continues until the opening operation is completed. At this time, the permanent magnet mechanism is always kept at the opening position under the action of the magnetic force of the permanent magnets (5, 6). The closing process is just opposite to the opening process: and electrifying the closing coil (3), generating a diamagnetic field in a lower gap by coil current, reducing the total attraction force on the movable iron core, moving the movable iron core upwards when the attraction force is smaller than the mechanism load on the movable iron core, and finally reaching the closing position to finish the closing process. Under the action of the magnetic force of the permanent magnet, the permanent magnet mechanism is kept at the switching-on position.
The structure of the traditional bistable permanent magnet operating mechanism is mainly that parts such as a permanent magnet, an electromagnetic coil and a movable iron core are all installed inside an outer yoke (a static iron core), the permanent magnet magnetic flux and the electromagnetic magnetic flux share a magnetic circuit, in the electromagnetic driving process, the iron core can carry larger magnetic flux to pass through a non-working electromagnetic coil, so that the working efficiency of the coil is reduced, in addition, the two electromagnetic coils are arranged in the same cavity, a coupling effect can be generated, the working efficiency of the electromagnetic coils is further reduced, the output characteristic of the mechanism is reduced, and the rigid separation speed and the rigid combination speed of the circuit breaker are difficult to improve.
Disclosure of Invention
The invention aims to provide a separated magnetic circuit type bistable permanent magnet operating mechanism, which overcomes the defects of the prior art, simplifies the structure of a retaining mechanism, improves the reliability, ensures that the output characteristic is more stable, improves the rigid opening speed and the rigid closing speed of a circuit breaker after the magnetic circuits of all functional parts are separated, avoids the electromagnetic coil from generating coupling to influence the working efficiency, and further optimizes the performance of the bistable permanent magnet operating mechanism.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a separated magnetic circuit type bistable permanent magnet operating mechanism comprises a retaining mechanism, a closing driving mechanism and an opening driving mechanism, wherein all the mechanisms are connected through a driving rod.
The holding mechanism includes: an upper end plate horizontally arranged below the upper magnetic isolation plate; the lower end plate is horizontally arranged above the lower magnetic isolation plate; an outer yoke disposed between the upper end plate and the lower end plate; the permanent magnets are uniformly and annularly distributed on the inner side of the outer yoke, and the magnetic pole directions of the permanent magnets are distributed along the radial direction; the magnetic collecting ring is arranged on the inner side of the permanent magnet; the keeping iron core is arranged in the magnetic collecting ring and is fixedly connected with the driving rod; and guide rings respectively arranged on the upper side and the lower side of the permanent magnet.
The closing drive mechanism includes: the closing static iron core is fixedly connected with the top of the upper magnetism isolating plate; the closing movable iron core is arranged above the closing static iron core and is fixedly connected with the driving rod; and the closing coil is embedded in the closing static iron core, and a magnetic closing loop is formed after the closing movable iron core is coupled with the closing static iron core.
The separating brake driving mechanism comprises: the opening static iron core is fixedly connected with the bottom side of the lower magnetic isolation plate; the opening brake movable iron core is arranged at the lower part of the opening brake static iron core and is fixedly connected with the driving rod; and the opening coil is embedded in the opening static iron core, and a magnetic closed loop is formed after the opening movable iron core and the opening static iron core are coupled.
The upper side, the lower side and the inner side of the closing coil are provided with continuous magnetic shielding layers, and in the closing driving process of the closing driving mechanism, magnetic flux generated by the closing coil only acts on a working air gap formed between the closing movable iron core and the closing static iron core.
The upper side, the lower side and the inner side of the opening coil are provided with continuous magnetic shielding layers, and in the opening driving process of the opening driving mechanism, magnetic flux generated by the opening coil only acts on a working air gap formed between the opening movable iron core and the opening static iron core.
The magnetic shielding layer is 0.5-3mm 6 series aluminum alloy.
The material of guide ring is polytetrafluoroethylene ring.
Compared with the prior art, the invention has the beneficial effects that: 1) the magnetic circuit complete separation of the closing driving mechanism and the holding mechanism is realized through an upper magnetic separation plate arranged between the two parts of mechanisms, the magnetic circuit complete separation of the opening driving mechanism and the holding mechanism is realized through a lower magnetic separation plate arranged between the two parts of mechanisms, and in the closing or opening driving process, the working magnetic circuit of the closing or opening driving mechanism is completely isolated from the working magnetic circuit of the holding mechanism, so that the reduction of the working efficiency of a closing or opening driving coil due to the magnetic circuit coupling problem in the working process can be effectively avoided; 2) in the process of driving closing, the closing driving mechanism only acts on a working air gap formed between a closing movable iron core and a closing static iron core by magnetic flux generated by a closing coil; in the process of opening the brake of the opening driving mechanism, magnetic flux generated by the opening coil only acts on a working air gap formed between the opening movable iron core and the opening static iron core, and after a working magnetic circuit of the closing or opening driving mechanism is decoupled from a working magnetic circuit of the retaining mechanism, the number of initial ampere-turns of the closing or opening coil can be effectively reduced, so that the closing or opening operation power is reduced, and the working efficiency of the mechanism and the speed just closing of the circuit breaker are effectively improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a structural schematic diagram of a conventional bistable permanent magnetic operating mechanism.
In the figure: 1-a stationary core; 2-a movable iron core; 3-closing a coil; 4-opening coil; 5-permanent magnet; 6-permanent magnet; 7-a drive rod; 8-a switching-on driving mechanism; 9-a holding mechanism; 10-a brake-separating driving mechanism; 11-a magnetic isolation frame; 12-a drive rod; 21-a guide ring; 22-a permanent magnet; 23-a holding core; 24-a magnetic collecting ring; 25-outer yoke; 26-an upper end plate; 27-a lower end plate; 101-upper magnetic isolation plate, 102-lower magnetic isolation plate; 103-upright post, 104-bolt; 201-closing static iron core; 202-closing movable iron core, 203-closing coil; 301-opening static iron core; 302-opening brake iron core, 303-opening brake coil.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Fig. 1 is a schematic structural diagram of an embodiment of a separated magnetic circuit type bistable permanent magnet operating mechanism of the present invention, which includes a holding mechanism 9, a closing driving mechanism 8 and an opening driving mechanism 10, wherein the respective portions are connected by a driving rod 12, the closing driving mechanism 8 is disposed above the holding mechanism 9, the opening driving mechanism 10 is disposed below the holding mechanism 9, and the holding mechanism 9 is disposed in a magnetic isolation frame 11 composed of an upper magnetic isolation plate 101, a lower magnetic isolation plate 102, a column 103 and a bolt 104. The magnetic isolation frame 11 completely isolates the working magnetic circuit of the closing or opening driving mechanism from the working magnetic circuit of the retaining mechanism, and can effectively avoid the reduction of the working efficiency of the closing or opening driving coil due to the problem of magnetic circuit coupling in the working process.
The holding mechanism 9 includes an upper end plate 26 horizontally disposed below the upper magnetism isolating plate 101; a lower end plate 27 horizontally disposed above the lower magnetism isolating plate 102; an outer yoke 25 disposed between the upper end plate 26 and the lower end plate 27; the permanent magnets 22 are uniformly and annularly distributed on the inner side of the outer magnetic yoke 25, and the magnetic pole directions of the permanent magnets 22 are distributed along the radial direction; a magnetism collecting ring 24 disposed inside the permanent magnet 22; a holding iron core 23 arranged inside the magnetism collecting ring 24, wherein the holding iron core 23 is fixedly connected with the driving rod 12; the guide rings 21 are respectively arranged on the upper side and the lower side of the permanent magnet 22, and the material of the guide rings 21 is polytetrafluoroethylene rings.
The closing driving mechanism 8 comprises a closing static iron core 201 fixedly connected with the top of the upper magnetism isolating plate 101; the closing movable iron core 202 is arranged above the closing static iron core 201, and the closing movable iron core 202 is fixedly connected with the driving rod 12; and when the closing movable iron core 202 is coupled with the closing static iron core 201, a magnetic closing loop is formed by the closing coil 203 embedded in the closing static iron core 201. The closing static iron core 201 is fixedly connected with the upper magnetism isolating plate 101 through screws.
The opening drive mechanism 10 includes: a switching-off static iron core 301 fixedly connected with the bottom side of the lower magnetic isolation plate 102; the opening brake movable iron core 302 is arranged at the lower part of the opening brake static iron core 301, and the opening brake movable iron core 302 is fixedly connected with the driving rod 12; and when the opening brake movable iron core 302 is coupled with the opening brake static iron core 301, a magnetic closed loop is formed by the opening brake coil 303 embedded in the opening brake static iron core 301. The opening static iron core 301 is fixedly connected with the lower magnetic isolation plate 102 through screws.
When the driving rod 12 moves up and down along the axial direction, the holding iron core 23, the opening iron core 302 and the closing iron core 202 can move synchronously with the driving rod 12, thereby completing the opening or closing operation.
The upper side, the lower side and the inner side of the closing coil 203 are provided with continuous magnetic shielding layers 13, and in the closing driving process of the closing driving mechanism 8, the magnetic flux generated by the closing coil 203 only acts on a working air gap formed between the closing movable iron core 202 and the closing static iron core 201. The upper side, the lower side and the inner side of the opening coil 303 are provided with continuous magnetic shielding layers 13, and in the opening driving process of the opening driving mechanism 10, the magnetic flux generated by the opening coil 303 only acts on a working air gap formed between the opening movable iron core 302 and the opening static iron core 301. The magnetic shield layer 13 is made of 2mm 6 series aluminum alloy.
With reference to fig. 1, in the closing operation of the embodiment of the present invention: the closing coil 203 is energized, and the closing coil 203 generates magnetic force after being energized, so that the driving rod 12 drives the closing movable iron core 202, the opening movable iron core 302 and the holding iron core 23 to move downwards. When the holding iron-core 23 moves to the lower end plate 27 position, a closed magnetic circuit is formed by the permanent magnet 22, the outer yoke 25, the lower end plate 27, the holding iron-core 23, and the magnetic collecting ring 24, so that the holding iron-core 23 is held at the on position.
When the switching-off operation is carried out: the opening coil 303 is energized, and the opening coil 303 generates magnetic force after being energized, so that the driving rod 12 drives the closing movable iron core 202, the opening movable iron core 302 and the holding iron core 23 to move upward. When the holding iron-core 23 moves to the upper end plate 26 position, a closed magnetic circuit is formed by the permanent magnet 22, the outer yoke 25, the upper end plate 26, the holding iron-core 23, and the magnetic collecting ring 24, so that the holding iron-core 23 is held at the opening position.
In the process of opening driving, the working magnetic circuit of the opening driving mechanism 10 is completely isolated from the working magnetic circuit of the retaining mechanism 9, so that the working efficiency of the opening coil can be effectively prevented from being reduced due to the problem of magnetic circuit coupling in the working process. After the working magnetic circuit of the opening driving mechanism 10 is decoupled from the working magnetic circuit of the retaining mechanism 9, the number of starting ampere-turns of the opening coil can be effectively reduced, so that the opening operation power is reduced, and the mechanism efficiency is improved. The closing driving process is the same, and the process is not repeated.
The separated magnetic circuit type bistable permanent magnet operating mechanism has the advantages of reasonable design, simple structure, high reliability and stable output characteristic, and the magnetic circuits of all functional parts are separated, so that the rigid separation speed and the rigid combination speed of the circuit breaker can be effectively improved, and the electromagnetic coil is prevented from generating coupling to influence the working efficiency.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A separated magnetic circuit type bistable permanent magnet operating mechanism comprises a retaining mechanism, a closing driving mechanism and an opening driving mechanism, wherein all the mechanisms are connected through a driving rod.
2. The split magnetic circuit type bistable permanent magnetic actuator of claim 1, wherein said holding mechanism comprises:
an upper end plate horizontally arranged below the upper magnetic isolation plate;
the lower end plate is horizontally arranged above the lower magnetic isolation plate;
an outer yoke disposed between the upper end plate and the lower end plate;
the permanent magnets are uniformly and annularly distributed on the inner side of the outer yoke, and the magnetic pole directions of the permanent magnets are distributed along the radial direction;
the magnetic collecting ring is arranged on the inner side of the permanent magnet;
the keeping iron core is arranged in the magnetic collecting ring and is fixedly connected with the driving rod;
and guide rings respectively arranged on the upper side and the lower side of the permanent magnet.
3. The bistable permanent magnetic actuator of claim 1, wherein the switching-on driving mechanism comprises:
the closing static iron core is fixedly connected with the top of the upper magnetism isolating plate;
the closing movable iron core is arranged above the closing static iron core and is fixedly connected with the driving rod;
and the closing coil is embedded in the closing static iron core, and a magnetic closing loop is formed after the closing movable iron core is coupled with the closing static iron core.
4. The bistable permanent magnetic actuator of claim 1, wherein said opening actuator comprises:
the opening static iron core is fixedly connected with the bottom side of the lower magnetic isolation plate;
the opening brake movable iron core is arranged at the lower part of the opening brake static iron core and is fixedly connected with the driving rod;
and the opening coil is embedded in the opening static iron core, and a magnetic closed loop is formed after the opening movable iron core and the opening static iron core are coupled.
5. The bistable permanent magnetic operating mechanism with separated magnetic circuits according to claim 3, wherein the upper side, the lower side and the inner side of the closing coil are provided with continuous magnetic shielding layers, and in the closing driving process of the closing driving mechanism, the magnetic flux generated by the closing coil only acts on the working air gap formed between the closing movable iron core and the closing static iron core.
6. The bistable permanent magnet operating mechanism according to claim 4, wherein the upper side, the lower side and the inner side of the opening coil are provided with continuous magnetic shielding layers, and during the opening driving process of the opening driving mechanism, the magnetic flux generated by the opening coil only acts on the working air gap formed between the opening movable iron core and the opening static iron core.
7. The bistable permanent magnetic actuator of claim 3 or 4, wherein said magnetic shielding layer is made of 6 series aluminum alloy of 0.5-3 mm.
8. The bistable permanent magnetic actuator of claim 1, wherein the guide ring is made of teflon ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111528027.4A CN114156122A (en) | 2021-12-15 | 2021-12-15 | Separated magnetic circuit type bistable permanent magnet operating mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111528027.4A CN114156122A (en) | 2021-12-15 | 2021-12-15 | Separated magnetic circuit type bistable permanent magnet operating mechanism |
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| Publication Number | Publication Date |
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| CN114156122A true CN114156122A (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111528027.4A Pending CN114156122A (en) | 2021-12-15 | 2021-12-15 | Separated magnetic circuit type bistable permanent magnet operating mechanism |
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| EP2328165A1 (en) * | 2009-11-25 | 2011-06-01 | Panasonic Electric Works Co., Ltd. | Electromagnetic relay |
| CN102820167A (en) * | 2007-03-27 | 2012-12-12 | 施耐德电器工业公司 | Bistable electromagnetic actuator |
| CN103155082A (en) * | 2010-08-31 | 2013-06-12 | 富士电机机器制御株式会社 | Electromagnetic switch |
| CN203596316U (en) * | 2013-12-12 | 2014-05-14 | 库柏爱迪生(平顶山)电子科技有限公司 | Bistable permanent magnetic mechanism |
| CN105006402A (en) * | 2015-07-23 | 2015-10-28 | 亚洲电力设备(深圳)股份有限公司 | Permanent-magnet vacuum circuit breaker switch |
| CN110752102A (en) * | 2019-11-11 | 2020-02-04 | 刘晓明 | Bidirectional permanent magnet retaining mechanism |
| CN111899997A (en) * | 2020-09-03 | 2020-11-06 | 安徽瑞保电气科技有限公司 | Holding mechanism of high-speed switch |
| CN212365841U (en) * | 2020-06-03 | 2021-01-15 | 正勤电气(沈阳)有限公司 | High-speed vacuum circuit breaker |
-
2021
- 2021-12-15 CN CN202111528027.4A patent/CN114156122A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003031087A (en) * | 2001-07-12 | 2003-01-31 | Mitsubishi Electric Corp | Electric power switch |
| CN1381855A (en) * | 2002-05-23 | 2002-11-27 | 江苏东源电器集团股份有限公司 | Permanent-magnet manipulating mechanism |
| CN102820167A (en) * | 2007-03-27 | 2012-12-12 | 施耐德电器工业公司 | Bistable electromagnetic actuator |
| EP2328165A1 (en) * | 2009-11-25 | 2011-06-01 | Panasonic Electric Works Co., Ltd. | Electromagnetic relay |
| CN103155082A (en) * | 2010-08-31 | 2013-06-12 | 富士电机机器制御株式会社 | Electromagnetic switch |
| CN203596316U (en) * | 2013-12-12 | 2014-05-14 | 库柏爱迪生(平顶山)电子科技有限公司 | Bistable permanent magnetic mechanism |
| CN105006402A (en) * | 2015-07-23 | 2015-10-28 | 亚洲电力设备(深圳)股份有限公司 | Permanent-magnet vacuum circuit breaker switch |
| CN110752102A (en) * | 2019-11-11 | 2020-02-04 | 刘晓明 | Bidirectional permanent magnet retaining mechanism |
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| CN111899997A (en) * | 2020-09-03 | 2020-11-06 | 安徽瑞保电气科技有限公司 | Holding mechanism of high-speed switch |
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