FI106911B - Screening device for screened rooms, rooms, enclosures or the like - Google Patents

Description

106911

Protective device for protected rooms, spaces, enclosures or similar

The invention relates to a protective device according to the preamble of the claim.

It is important to prevent electrical, magnetic and electromagnetic fields from propagating to specific areas of space in order to ensure the integrity of electrical, electronic and telecommunications equipment and installations, and to achieve protection against encryption (encryption).

This may be done by placing the protected equipment and installations inside electromagnetically shielded rooms, spaces or enclosures.

10 The measure of the protective effect is the damping effect, which must be as high as possible.

Shielded doors, hatches or windows, as well as removable enclosures, such as those with screws, such as modular structures, must have the best possible and high-frequency contact between the enclosure parts of the contact devices for space protection.

The high frequency contact between the housing covers and the housings uses braided seals or conductive elastic materials.

Braided seals or contact spring assemblies usually represent the weakest damping point of the shield.

20 Therefore, it is an ongoing task to adapt these contact areas to the state of the art of site protection to improve the protective effect.

The protective effect of the contact spring systems and the braided seals is greatly diminished, especially in the microwave (GHz) region, since on the one hand impedance of these systems deteriorates and on the other hand it is not possible to achieve complete aperture coverage of the contact regions.

Contact spring devices such as knife contact system or Z-spring, split springs and wave springs are disclosed in Siemens-Datenbuch 1983/84, "EMV-Raumschirmung, Kabinen, Bauteile, Filter".

The contact springs are either housed in a spring housing or directly between the contact surfaces of the door and the frame 30 or the profiles of the space module.

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In railroad cases, good low-impedance electrical contact must be obtained between the contacting surfaces or housing parts.

However, in the microwave range, these contact devices are not sufficient to meet the increasing protection requirements.

5 To date, space-shielded copper or steel plates soldered or welded together have been used to achieve HF sealing in the microwave region.

The contact devices of the protected doors and enclosures employ a plurality of parallel and overlapping rows of springs or braided seals, whereby, inevitably, small tolerance deviations or surface irregularities immediately result in non-sealing.

It is an object of the invention to further develop the shielding device disclosed in the introduction so that even in the microwave region, reliable shielding can be obtained.

According to the invention, this object is solved by the features of the claim.

The invention has the advantage that microwaves propagating in cavities (waveguides), such as those found in contact devices, and which can penetrate through spring gaps, particularly in the buttocks or corner areas of protected rooms, doors or casing lids. , become reliably suppressed or absorbed.

20 The proposed absorbent material is a high permeability damping agent available, e.g., from Emerson & Cuming, Westerloo (Belgium) under the tradename Eccosorb LS 30.

The invention will be explained in more detail by means of the various embodiments shown in the following drawing, which is shown in Figures 1-5.

Figure 1 shows a door spring housing 13 into which a door frame knife 11 engages. The first contact device is the finger spring strips 12 which contact the door frame knife 11. The space below the finger spring strips 12 in the spring housing 13 is filled with absorbent material 14 such that the frame knife 11 is pressed into the foam material of the absorbent material 14. This embodiment ensures that the absorbent material 30 fills the spaces to be compacted under light pressure without gaps and openings.

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Fig. 2 shows another exemplary embodiment showing a protective device between the door 21 and the frame (threshold) 23. The first contact device consists of a contact spring (Z-spring) 22.

Fig. 3 shows another protective device between the door frame 33 and the door 31, wherein the first contact device is likewise used as a contact spring 32. The absorbent material 34 is disposed in the empty space between the door frame 33 and the door 31 so that closing the door provides shielding effect in the microwave range.

Fig. 4 shows a wall profile 41 screwed together by a contact screw 45. The space between the lining plates 46 is protected by a contact spring (corrugated spring) 42. The space fitted inside the connection strip 43 is filled with absorbent material 44.

Figure 5 illustrates the protection of the housing 52 enclosed by the cover 51 by a knife contact 15 55. The knife contact 55 penetrates into a seal 53 which is either a braided seal or consists of a conductive rubber seal.

The second space is filled with absorbent material 54.

The embodiments shown in the figures provide reliable protection both in the microwave range up to at least 35 GHz and at lower frequencies since the absorbent material adapted in accordance with the invention is combined with at least one other lower frequency contacting array such as a spring system,

The embodiments shown in Figures 1-5, for example, improve the protection attenuation of known contact devices up to 110 dB 25 at frequencies up to 18 GHz.

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Claims (1)

4 106911 Claim Protecting device for protected rooms, spaces, enclosures or the like having high-frequency shielded movable or interconnected relative to one another, e.g. the peripheral contact areas are protected by at least one contact arrangement, characterized in that the void spaces located at the periphery of the housing parts are at least partially filled with an absorbent material (14, 24, 34, 44, 54) substantially free of gaps and openings; 14, 24, 34, 44, 54) consists of a foam material to which conductive lossy carbon-based material 10 has been added. Avskärmningsanordning för avermärum rum, utrüm, höljen eller dylika, lively har högfrekvenstät avskärmning av inbördes with eller moss teeth, exempelvis screws delar av höljet, särskar dörrkarmar, dörrar, fönarm tentative nose av att de tomma halrummen höljesdelamas randomly handled ätminstone delvis and filed absorberande material (14, 24, 34, 44, 54) tirarligen utan spalter och öppningar och att detorberande materialet (14, 24, 34, 44, 54) bestar av ett skumämne, account whistling tillsatts ett 20 ledande kolbaserat förlustbehäftat material.