CN115631973A

CN115631973A - Electromagnetic driving device of high-voltage normally-closed direct-current contactor

Info

Publication number: CN115631973A
Application number: CN202211440078.6A
Authority: CN
Inventors: 代华江; 孟新意; 雷凤华; 茶岩
Original assignee: GUIZHOU TIANYI ELECTRICAL CO Ltd
Current assignee: GUIZHOU TIANYI ELECTRICAL CO Ltd
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-01-20

Abstract

A high-voltage normally closed direct current contactor electromagnetic driving device is characterized in that a contact spring is mounted on the upper portion of a core rod, a movable contact is arranged below the contact spring, a normally closed contact is arranged below the movable contact, a static contact piece is arranged below the normally closed contact, an iron yoke A is arranged below the static contact piece, and a flange plate is arranged between the iron yoke A and the iron yoke B; a return spring is arranged at the lower part of a core rod arranged in the iron yoke A, an iron core is arranged outside the return spring, and a coil is arranged outside the iron core; and the iron yoke B is internally provided with annular permanent magnetic steel. The invention adds the permanent magnet at the initial position of the iron core to achieve the effects of avoiding action rebound and increasing contact pressure. The normally closed contact can be effectively controlled, false operation caused by rebound of the movement mechanism is avoided, and the contact is burnt and ablated. Simple structure, easy realization and action avoidance.

Description

Electromagnetic driving device of high-voltage normally-closed direct-current contactor

Technical Field

The invention relates to an electromagnetic driving device of a high-voltage normally-closed direct current contactor.

Background

In the design process of the high-voltage direct-current contactor, in order to enable a contact to have high on-off capacity, the design must consider that the pressure of the contact is large enough, the compression stroke and the elastic coefficient of a contact spring and a return spring cannot be kept consistent, in the mechanism action process, the two springs are periodically compressed and released respectively, a movement mechanism is enabled to continuously rebound and vibrate within a period of about 10ms, the rebound vibration can enable an opened contact gap to be reduced, normally closed contacts to be reserved and reduced, the normally closed contacts to be disconnected, the contact can be enabled to be opened again, arc discharge and ablation are continuously carried out among the contacts, the backup stroke of the contacts is lost, and the reliability of a contactor product is reduced.

Disclosure of Invention

The invention aims to solve the technical problems of reducing contact bounce and arc-drawing ablation, avoiding instantaneous interruption of contact vibration, improving the contact reliability, ensuring the contact reliability of a normally closed contactor, having higher anti-vibration value and preventing continuous adjustment of contact connection instant and unreliable contact of the contact particularly in the field of high-voltage contactors.

In order to solve the technical problems, the invention adopts the following technical scheme:

a high-voltage normally closed direct current contactor electromagnetic driving device comprises a core rod, a contact spring, a movable contact, a normally closed contact, a static contact piece, an iron yoke A, an iron yoke B, a flange plate, a return spring, an iron core, a coil and annular permanent magnetic steel; a contact spring is arranged at the upper part of the core rod, a movable contact is arranged below the contact spring, a normally closed contact is arranged below the movable contact, a static contact piece is arranged below the normally closed contact, an iron yoke A is arranged below the static contact piece, and a flange plate is arranged between the iron yoke A and the iron yoke B; a return spring is arranged at the lower part of a core rod arranged in the iron yoke A, and an iron core is arranged outside the return spring; and a coil is arranged above the flange plate, and annular permanent magnetic steel is arranged below the flange plate.

The beneficial effect of adopting above-mentioned technical scheme is:

the invention adds the permanent magnet at the initial position of the iron core to achieve the effects of avoiding action rebound and increasing contact pressure. The normally closed contact can be effectively controlled, false operation caused by rebound of the movement mechanism is avoided, and the contact is burnt and ablated. Simple structure, easy realization, contact bounce arc discharge and contact reliability improvement effect of contact pressure increase that can avoid action to kick-back to lead to.

Drawings

Fig. 1 is a schematic structural diagram of an electromagnetic driving device of a high-voltage normally-closed dc contactor according to the present invention.

In the figure: 1-core rod, 2-contact spring, 3-moving contact, 4-normally closed contact, 5-static contact piece, 6-iron yoke A, 7-iron yoke B, 8-flange, 9-return spring, 10-iron core, 11-coil and 12-annular permanent magnetic steel.

Fig. 2 is a schematic diagram of the magnetic circuit of the electromagnet of the invention.

In the figure: a-coil magnetic circuit phi 2, B-permanent magnetic circuit phi 1.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

an electromagnetic driving device of a high-voltage normally-closed direct current contactor is shown in fig. 1: the magnetic core comprises a core rod 1, a contact spring 2, a movable contact 3, a normally closed contact 4, a static contact piece 5, an iron yoke A6, an iron yoke B7, a flange 8, a return spring 9, an iron core 10, a coil 11 and annular permanent magnetic steel 12; a contact spring 2 is arranged at the upper part of the core rod 1, a movable contact 3 is arranged below the contact spring 2, a normally closed contact 4 is arranged below the movable contact 3, a static contact piece 5 is arranged below the normally closed contact 4, an iron yoke A6 is arranged below the static contact piece 5, and a flange plate 8 is arranged between the iron yoke A6 and an iron yoke B7; a return spring 9 is arranged at the lower part of a core rod 1 arranged in the iron yoke A6, and an iron core 10 is arranged outside the return spring 9; a coil 11 is installed above the flange plate 8, an annular permanent magnet steel 12 is installed below the flange plate 8, a magnetic circuit formed by the annular permanent magnet steel 12 instantly absorbs the released iron core 10 in a permanent magnet loop, and the moving mechanism cannot cause rebound vibration.

As shown in fig. 2: the annular permanent magnet steel 12 and the coil 11 form two opposite magnetic loops, and in a static state, the iron core 10, the flange 8 and the iron yoke B7 form a permanent magnetic loop phi 1A, and the magnetic loop attracts the iron core 10 to a magnetic pole of the iron yoke B7. When the coil 11 is electrified, the iron core 10, the flange 8 and the iron yoke A6 generate a coil magnetic circuit phi 2B by the coil 11, and counteract the force of the permanent magnetic circuit phi 1A on the iron core 10, so that the iron core 11 is attracted on the magnetic pole of the iron yoke A6, and the normally closed contact is opened. When the coil 11 is powered off, the return spring 9 is released from compression, the contact spring 2 is released from compression, the iron core 11 is accelerated to be attracted on the magnetic pole of the iron yoke B7 under the action of the permanent magnetic circuit phi 1A, the iron core 11 cannot be moved by reverse pull force generated at the moment when the contact spring 2 compresses the maximum value, the movement mechanism does not generate redundant movement, the normally closed contact 4 can be firmly contacted, and additional bouncing and arc drawing cannot occur.

The general motion mechanism pushes the micro switch or the auxiliary reed to make the auxiliary contact of the contactor perform on-off conversion, when the motion mechanism rebounds, the auxiliary contact is easy to malfunction, and meanwhile, the auxiliary contact has more arc discharge and ablation times, so that the reliability is reduced. In the structure, the movement mechanism has a locking effect, and can also play a role in reducing bounce and arcing time for the normally closed contact 4 in the normally open contactor.

The invention aims to provide a contactor electromagnetic driving structure which adopts annular permanent magnetic steel to avoid continuous rebound vibration of a movement mechanism of a normally closed high-voltage direct-current contactor during action, so that the conditions of unstable contact of contacts and continuous arc discharge ablation caused by rebound vibration of the movement mechanism can be avoided, the contact bounce time is reduced, and the contact breaking capacity and the service life times are greatly improved.

The invention solves the problem that the main contact of the high-voltage normally-closed direct current contactor is abnormally separated from the arc and also solves the problem that the auxiliary contact of the normally-open contactor is in misoperation to cause extra arc.

Claims

1. The utility model provides a high pressure normally closed type direct current contactor electromagnetic drive device which characterized in that: the magnetic core comprises a core rod (1), a contact spring (2), a movable contact (3), a normally closed contact (4), a static contact piece (5), an iron yoke A (6), an iron yoke B (7), a flange plate (8), a return spring (9), an iron core (10), a coil (11) and annular permanent magnetic steel (12); a contact spring (2) is arranged at the upper part of the core rod (1), a movable contact (3) is arranged below the contact spring (2), a normally closed contact (4) is arranged below the movable contact (3), a static contact piece (5) is arranged below the normally closed contact (4), an iron yoke A (6) is arranged below the static contact piece (5), and a flange plate (8) is arranged between the iron yoke A (6) and the iron yoke B (7); a return spring (9) is installed at the lower part of a core rod (1) arranged in the iron yoke A (6), and an iron core (10) is installed outside the return spring (9); and a coil (11) is arranged above the flange plate (8), and an annular permanent magnetic steel (12) is arranged below the flange plate (8).