RU160680U1 - SCREEN DEVICE - Google Patents

Abstract

A shielding device containing a closed metal shell, identical pairwise symmetrical coils of electrically conductive material placed on its inner and outer surfaces, interconnected by opposite ends through openings in the shell and insulated from the shell and one from the other, characterized in that the coils are placed on one side of the shell, arranged concentrically.

Description

The shielding device claimed as a utility model relates to electro-radio engineering, in particular, to protection (shielding) of equipment from electromagnetic fields.

Known electromagnetic screen, which contains a housing with double parallel inner and outer walls. On the inner walls made ventilation holes. It is also equipped with metal partitions installed between the internal and external parallel walls of the housing perpendicular to them. The latter are located symmetrically relative to the ventilation holes (AS No. 1012467).

The prototype is a device for shielding from variable magnetic fields, which contains a closed shielding and coils, which are made of electrically conductive material. They are located on the outer and inner surfaces of the shielding shell, and are symmetrically between themselves and isolated from it. Through-holes are made in the shielding shell under the ends of the turns. Moreover, the opposite turns of the outer and inner surfaces of the shielding shell are electrically connected to each other by their opposite ends through the through holes of the shielding shell (AS No. 1225056).

A disadvantage of the known devices is that they do not have high shielding efficiency.

The objective of the utility model is to increase the shielding efficiency.

The technical result is that the turns are located on the surfaces of the shielding shell coaxially, which leads to the absence of sections of adjacent turns with the opposite direction of the currents.

This is achieved due to the fact that the shielding device for protection against variable electromagnetic fields contains a closed metal shell, identical pairwise symmetrical coils of electrically conductive material placed on its inner and outer surfaces, which are interconnected by opposite ends through openings in the shell and insulated from the shell and one from the other. The turns, which are placed on one side of the shell, are concentric.

In FIG. 1 shows the proposed shielding device, General view.

In FIG. 2 shows the placement of pairwise symmetric short-circuited turns on the shell.

In FIG. 3 shows the connection of pairs of pairwise symmetric turns.

The shielding device proposed as a utility model comprises a closed metal shell 1, on the outer and inner surfaces of which are placed pairwise symmetrical coils 2 and 3 of electrically conductive material, interconnected by opposite ends through holes 4 in the shell 1 using conductors 5 and isolated from the metal shell electrical insulating gaskets.

The screening device operates as follows;

An external electromagnetic field incident on the device induces eddy currents in the shell 1 and in the outer part of pairwise symmetrical turns 2, 3.

As a result of the interaction of these fields, the external field is weakened, and the remaining part, which penetrates into the shell, is weakened due to superposition with the field of currents flowing along the inner part of pairwise symmetric turns 2, 3.

The use of a shielding device proposed as a utility model makes it possible to improve the shielding efficiency by 20-35%.

Claims (1)

A shielding device containing a closed metal shell, identical pairwise symmetrical coils of electrically conductive material placed on its inner and outer surfaces, interconnected by opposite ends through openings in the shell and insulated from the shell and one from the other, characterized in that the coils are placed on one side of the shell, arranged concentrically.

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