CN201387819Y - Electric switch permanent magnet operating mechanism - Google Patents

Abstract

The utility model relates to the field of high, medium and low voltage electric switches, which is a permanent magnet operating mechanism for electric switches, which includes a yoke body composed of an upper yoke, a lower yoke, an inner yoke and an outer yoke. There is a permanent magnet between the yoke and the outer yoke, and the closing and opening coils with skeletons are arranged inside the outer yoke. The T-shaped moving iron core is placed in the center of the closing and opening coil skeleton. The T-shaped moving iron core and the Drive shaft threaded connection. Its characteristics are: there is an opening pressure spring in the concave cavity formed by the moving iron core and the lower yoke. When the moving iron core moves down to the closing position, the opening pressure spring is compressed to store energy. When the gate coil passes the opening current, the moving iron core moves to the opening position under the action of the opening electromagnetic force, and the opening pressure spring releases energy instantaneously, which accelerates the opening movement speed of the moving iron core, that is, speeds up the vacuum extinction. The opening movement speed of the moving contact of the arc chamber shortens the arcing time of the contacts of the vacuum interrupter, thus prolonging the service life of the vacuum interrupter.

Description

Electric switch permanent magnet operating mechanism

technical field

The utility model relates to the field of high, medium and low voltage electrical switches, and is a permanent magnet operating mechanism for electrical switches.

Background technique

The existing electric switch permanent magnet operating mechanism is widely used in high, medium and low voltage power systems due to its simple structure, few parts, high reliability and low production cost. When the moving iron core of the permanent magnet operating mechanism of the switch moves from the closing position to the opening position, since the opening current passed by the closing and opening coils is small, the electromagnetic force of the opening is also small, that is, the opening movement of the moving iron core The speed is low, and at the same time, the moving speed of the moving contact of the vacuum interrupter driven by the moving iron core decreases accordingly, resulting in too long arcing time when the contact of the vacuum interrupter is opened, which greatly shortens the life of the vacuum interrupter. service life.

Contents of the invention

The purpose of the utility model is to provide a permanent magnet operating mechanism of an electric switch which can increase the moving iron core of the permanent magnet operating mechanism and move from the closing position to the opening position.

The purpose of this utility model is achieved by the following scheme:

The permanent magnet operating mechanism of the electric switch includes a yoke body composed of an upper yoke, a lower yoke, an inner yoke and an outer yoke. A permanent magnet is arranged between the inner yoke and the outer yoke. There are closing and opening coils with skeletons, the T-shaped moving iron core is placed in the center of the closing and opening coil skeletons, and the T-shaped moving iron core is screwed with the transmission shaft. Its special feature is that there is an opening pressure spring in the concave cavity formed by the moving iron core and the lower yoke. When the moving iron core moves down to the closing position, the opening pressing spring is compressed and stores energy. 1. When the opening coil passes the opening current, when the moving iron core moves to the opening position under the action of the opening electromagnetic force, the opening pressure spring releases energy instantly, which accelerates the opening movement speed of the moving iron core, that is, speeds up The opening speed of the moving contact of the vacuum interrupter is improved, and the arcing time of the contact of the vacuum interrupter is shortened, thereby prolonging the service life of the vacuum interrupter.

Description of drawings

Figure 1 is a schematic cross-sectional view of the structure of the permanent magnet operating mechanism of the electric switch. (open state)

Figure 2 is a schematic cross-sectional view of the structure of the electric switch permanent magnet operating mechanism. (closed state)

Detailed ways

Referring to Figure 1, the electric switch permanent magnet operating mechanism has a yoke body composed of an upper yoke 2, an outer yoke 3, a lower yoke 10, and an inner yoke 5. The outer yoke 3 is connected with the upper yoke 2 and the lower yoke 10, a permanent magnet 6 is arranged between the inner yoke 5 and the outer yoke 3, and a closing and opening coil 9 with a skeleton is arranged inside the outer yoke 3, The T-shaped moving iron core 4 is placed in the center of the closing and opening coil 9 skeleton, the T-shaped moving iron core 4 is connected with the transmission shaft 1, and the opening is provided in the concave cavity 7 formed by the moving iron core 4 and the lower yoke 10 Compression spring 8.

Referring to Figure 1 and Figure 2, the working process of the electric switch permanent magnet operating mechanism is:

Closing state: The T-shaped moving iron core 4 is from the position in the original figure 1, and the forward current is applied to the closing and opening coils 9, so that the T-shaped moving iron core 4 moves to the position in the figure 2, and the N pole of the permanent magnet 6 → Inner yoke 5 → Moving iron core 4 → Lower yoke 10 → Outer yoke 3 → The S pole of permanent magnet 6 forms a closed magnetic circuit. The stable state when closing is formed, the transmission shaft 1 connected with the T-shaped moving iron core 4 drives the transmission to make the electric switch in the closing position.

Opening state: the T-shaped moving iron core 4 is from the position in the original figure 2, and the closing and opening coils 9 are supplied with reverse current, so that the T-shaped moving iron core 4 moves to the position in the figure 1, and the N pole of the permanent magnet 6 → Inner yoke 5 → Moving iron core 4 → Upper yoke 2 → Outer yoke 3 → The S pole of the permanent magnet 6 forms a closed magnetic circuit. Both form the stable state when opening the gate, and the transmission shaft 1 connected with the T-shaped moving iron core 4 drives the transmission device to make the electric switch be in the opening position.

Claims (1)

1. the electric switch permanent-magnet manipulating mechanism includes the yoke body of upper magnet yoke, lower yoke, inner yoke, outer yoke composition, between outer yoke and inner yoke, be provided with permanent magnet, in outer yoke, be provided with band the closing of skeleton, switching winding, the moving iron core of T type places and closes, the center of switching winding skeleton, the moving iron core of T type is threaded with power transmission shaft, it is characterized in that: be provided with the separating brake stage clip in the cavity of moving iron core and lower yoke formation.

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