CN113782393B - Follow-up permanent magnetic field arc extinguishing mechanism in double-breakpoint direct-acting contactor - Google Patents
Follow-up permanent magnetic field arc extinguishing mechanism in double-breakpoint direct-acting contactor Download PDFInfo
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- CN113782393B CN113782393B CN202111129622.0A CN202111129622A CN113782393B CN 113782393 B CN113782393 B CN 113782393B CN 202111129622 A CN202111129622 A CN 202111129622A CN 113782393 B CN113782393 B CN 113782393B
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- permanent magnet
- gear
- arc extinguishing
- bracket
- fixed
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a follow-up permanent magnet field arc extinguishing mechanism in a double-breakpoint direct-acting contactor, which comprises a moving contact, a fixed contact, a permanent magnet, a rack, a gear, a bracket and a connecting rod, wherein the moving contact and the gear are fixed on the upper part of the connecting rod, the permanent magnet comprises a first permanent magnet, a second permanent magnet, a third permanent magnet and a fourth permanent magnet, the first permanent magnet and the second permanent magnet are fixed on a first bracket, and the third permanent magnet and the fourth permanent magnet are fixed on a second bracket; the first bracket and the second bracket are respectively connected with two connecting rods with racks, the front-back motion of the permanent magnets is related to the up-down motion of the moving contact by adopting gear-rack transmission, so that the distance between the permanent magnets at two sides is changed along with the motion of the moving contact, the size of an arc extinguishing magnetic field is changed, the arc starting speed in the arc starting stage is prevented from being too slow, the insulation and pressure resistance of a device in the arc starting stage is prevented from being reduced too fast, the arc extinguishing speed between the contacts of the contactor is enabled to be faster, and the higher pressure-resistant and insulation performance is maintained.
Description
Technical Field
The invention belongs to the technical field of contactors, and relates to a device for carrying out arc extinction by utilizing a permanent magnetic field capable of moving along with movement of an armature.
Background
When the circuit is opened in the atmosphere, if the opening current and the voltage between the contacts after opening are larger than the arc generating current and the arc generating voltage, an arc can be generated between the contacts. For a switching device, the presence of an arc may delay the circuit from opening and burning the contacts, which in severe cases may cause ignition and explosion of the switching device. Therefore, how to extinguish the arc as soon as possible is a key point of attention for researchers. Magnetic quenching is a typical quenching device, which uses electromotive force to drive an arc to transversely elongate, so that the voltage of the arc increases, the volt-ampere characteristic of the arc leaves a stable burning point, and the arc is quenched. The arc extinguishing magnetic field magnetic induction intensity B is too small to cause low arcing speed, the arc extinguishing magnetic field magnetic induction intensity B is too large to cause high charged particle diffusion speed, and a large amount of metal particles are attached to the inner wall of an arc extinguishing chamber after arcing and cooling to cause the pressure-resistant insulation performance of the device to be reduced too fast; the magnitude of the quenching field should be variable during the switching-off process. There is currently a lack of means for varying the magnitude of the quenching field in the configuration of the quenching device.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a follow-up permanent magnet field extinguishing mechanism in a double-breakpoint direct-acting contactor. The structure can enable the distance between the two permanent magnets providing the arc extinguishing magnetic field to change along with the process of opening and closing the contact; the distance between the permanent magnets in the arcing stage is short, a large arc extinguishing magnetic field is provided, and the arcing speed is prevented from being too slow; the distance of the permanent magnet is far in the arcing stage, so that the arc extinguishing magnetic field is reduced, and the device voltage-resistant insulation performance is prevented from being reduced too fast.
The invention aims at realizing the following technical scheme:
a follow-up permanent magnetic field arc extinguishing mechanism in a double-breakpoint direct-acting contactor comprises a moving contact, a fixed contact, a permanent magnet, a rack, a gear, a bracket and a connecting rod, wherein:
the movable contact and the gear are fixed on the upper part of the connecting rod, and the gear is positioned below the movable contact;
the permanent magnets comprise a first permanent magnet, a second permanent magnet, a third permanent magnet and a fourth permanent magnet, wherein the first permanent magnet and the second permanent magnet are arranged at the left side of a contact gap, the third permanent magnet and the fourth permanent magnet are arranged at the right side of the contact gap, the first permanent magnet and the third permanent magnet are oppositely arranged, and the second permanent magnet and the fourth permanent magnet are oppositely arranged;
the first permanent magnet and the second permanent magnet are fixed on the first bracket, and the third permanent magnet and the fourth permanent magnet are fixed on the second bracket;
the first support and the second support are respectively connected with two connecting rods with racks, the racks are positioned on two sides of the gear and meshed with the gear, and the up-and-down motion of the moving contact is converted into the front-and-back motion of the permanent magnet by utilizing the gear-rack transmission.
Compared with the prior art, the invention has the following advantages:
the invention provides a contactor with a permanent magnet arc extinguishing device aiming at double-breakpoint direct-acting, wherein the front-back movement of a permanent magnet is related to the up-down movement of a moving contact by adopting gear-rack transmission, so that the distance between the permanent magnets at two sides is changed along with the movement of the moving contact, thereby changing the size of an arc extinguishing magnetic field, avoiding too slow arcing speed in the arcing stage and too fast reduction of the insulation and pressure resistance of a device in the arcing stage, leading the extinguishing speed of the electric arc between the contacts of the contactor to be faster, and keeping higher pressure-resistant and insulation performance.
Drawings
FIG. 1 is a general block diagram of a follow-up permanent magnet field arc extinguishing mechanism in a double breakpoint direct-acting contactor;
FIG. 2 is a diagram of the permanent magnet, bracket, rack bar configuration;
FIG. 3 is a diagram of moving contact, connecting rod, and gear;
in the figure, A-static contact, B-moving contact, C-permanent magnet and C 1 -a first permanent magnet, C 2 -a second permanent magnet, C 3 -a third permanent magnet, C 4 -a fourth permanent magnet, D-rack, E-gear, F-bracket, G-link.
Detailed Description
The following description of the present invention is provided with reference to the accompanying drawings, but is not limited to the following description, and any modifications or equivalent substitutions of the present invention should be included in the scope of the present invention without departing from the spirit and scope of the present invention.
The invention provides a design method of a follow-up permanent magnetic field arc extinguishing mechanism applied to a double-breakpoint direct-acting contactor arc extinguishing system, which comprises the following steps:
1. the permanent magnets are respectively arranged at two sides of a gap between the movable contact and the fixed contact in a typical magnetic blow-out arc extinguishing mode, and the generated magnetic field can lead the electric arc to be driven by electric power, so that the electric arc is lengthened towards two sides and extinguished;
2. the arc extinguishing magnetic field has a relatively short distance in the arcing stage, so that the arcing speed is relatively high; meanwhile, the arc extinguishing magnetic field is far away in the arcing stage, so that the phenomenon that charged particles are excessively diffused and the insulation and pressure resistance of the device are reduced is avoided.
3. The part of the contactor which drives the contact B to move is an armature, and the movement of the permanent magnet C is related to the movement of the armature.
4. A gear E is sleeved on a connecting rod G below a moving contact B, each side of a permanent magnet C is divided into two parts and connected with a rack D through a bracket F, the permanent magnets C on two sides are respectively connected with the rack D through the bracket F, the up-and-down motion of the moving contact is converted into the front-and-back motion of the permanent magnets through gear-rack transmission, the distance of the permanent magnets is changed along with the contact breaking process, and therefore the aim of changing the size of an arc extinguishing magnetic field is achieved.
The specific assembly comprises the following steps:
step S1: the contact system part is assembled, and the gear E and the moving contact B are assembled on the cylindrical connecting rod G. The structure is shown in fig. 3, the moving contact B and the gear E are fixed on the upper part of the cylindrical connecting rod G, and the gear E is positioned below the moving contact B, so that the moving contact B drives the gear E to move through the cylindrical connecting rod G in the breaking movement process.
Step S3: and assembling the permanent magnet C and the bracket F containing the rack D. The structure is shown in fig. 2, each side of the permanent magnet C is divided into two pieces and is respectively fixed on two brackets F; the middle of each side bracket F is respectively connected with a connecting rod containing a rack D; therefore, the rack D moves to drive the bracket F and the permanent magnet C on the bracket F to move.
Step S4: and mounting the fixed contact A on the base.
Step S5: and finally, assembling the gear E and the rack D, and assembling the moving contact B and the fixed contact A.
The specific motion process of the permanent magnet is as follows:
1: before the contact is disconnected, the permanent magnets on the two sides are positioned at the initial position, and the distance is relatively short;
2: after the contact is disconnected, the armature moves downwards and drives the gear to rotate, and the rack moves along with the rotation of the gear; the left permanent magnet moves leftwards, the right permanent magnet moves rightwards, the distance between the permanent magnets at the two sides is continuously increased, and the arc extinguishing magnetic field is continuously reduced.
In summary, the design method of the follow-up permanent magnetic field arc extinguishing mechanism applied to the double-breakpoint direct-acting contactor arc extinguishing system can enable the permanent magnet to move along with the breaking process of the contact, and realize the change of the arc extinguishing magnetic field from large to small, so that the over-slow arcing speed in the arcing stage and the over-fast reduction of the insulation and pressure resistance of the device in the arcing stage are avoided, the extinction speed of the electric arc between the contacts of the contactor is higher, and meanwhile, the higher pressure-resistant and insulation performance is maintained.
Claims (3)
1. The follow-up permanent magnetic field arc extinguishing mechanism in the double-breakpoint direct-acting contactor is characterized by comprising a moving contact, a fixed contact, a permanent magnet, a rack, a gear, a support and a connecting rod, wherein:
the movable contact and the gear are fixed on the upper part of the connecting rod, and the gear is positioned below the movable contact;
the permanent magnets comprise a first permanent magnet, a second permanent magnet, a third permanent magnet and a fourth permanent magnet, wherein the first permanent magnet and the second permanent magnet are arranged at the left side of a contact gap, and the third permanent magnet and the fourth permanent magnet are arranged at the right side of the contact gap;
the first permanent magnet and the second permanent magnet are fixed on the first bracket, and the third permanent magnet and the fourth permanent magnet are fixed on the second bracket;
the first support and the second support are respectively connected with two connecting rods with racks, the racks are positioned on two sides of the gear and meshed with the gear, and the up-and-down motion of the moving contact is converted into the front-and-back motion of the permanent magnet by utilizing the gear-rack transmission.
2. The follow-up permanent magnet field arc extinguishing mechanism in a double breakpoint direct action contactor according to claim 1, wherein the connecting rod is cylindrical.
3. The follow-up permanent magnet field arc extinguishing mechanism in the double breakpoint direct action contactor according to claim 1, wherein the first permanent magnet and the third permanent magnet are disposed opposite to each other, and the second permanent magnet and the fourth permanent magnet are disposed opposite to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111129622.0A CN113782393B (en) | 2021-09-26 | 2021-09-26 | Follow-up permanent magnetic field arc extinguishing mechanism in double-breakpoint direct-acting contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111129622.0A CN113782393B (en) | 2021-09-26 | 2021-09-26 | Follow-up permanent magnetic field arc extinguishing mechanism in double-breakpoint direct-acting contactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113782393A CN113782393A (en) | 2021-12-10 |
| CN113782393B true CN113782393B (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111129622.0A Active CN113782393B (en) | 2021-09-26 | 2021-09-26 | Follow-up permanent magnetic field arc extinguishing mechanism in double-breakpoint direct-acting contactor |
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| Country | Link |
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| CN (1) | CN113782393B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002048037A (en) * | 2000-07-28 | 2002-02-15 | Denso Corp | Starter |
| CN104916474A (en) * | 2015-05-08 | 2015-09-16 | 上海电机学院 | Permanent-magnet contactor arc extinguishing device |
| CN109378255A (en) * | 2018-10-22 | 2019-02-22 | 安徽银点电子科技有限公司 | A kind of relay |
-
2021
- 2021-09-26 CN CN202111129622.0A patent/CN113782393B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002048037A (en) * | 2000-07-28 | 2002-02-15 | Denso Corp | Starter |
| CN104916474A (en) * | 2015-05-08 | 2015-09-16 | 上海电机学院 | Permanent-magnet contactor arc extinguishing device |
| CN109378255A (en) * | 2018-10-22 | 2019-02-22 | 安徽银点电子科技有限公司 | A kind of relay |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113782393A (en) | 2021-12-10 |
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