DE3822632A1 - High-frequency-insulated cable lead-through for screening walls - Google Patents

Abstract

It is known to enclose the bared screenings (2) of the cables with electrically conducting shaped parts in the region of the cable lead-through. In this case it is however necessary to have available a special shaped part for each different cable external diameter. The new high-frequency-insulated cable lead-through for screening walls is intended to be constructed, with higher screening efficiency, in such a way that the cables can be replaced, removed or put in quickly and simply. The electrically conducting medium is preparable using a bulk material (12) of constant consistency, the cable cross-section being itself made trough-shaped and capable of being filled with and emptied of the bulk material (12). This trough-shaped cable penetration (3) is fitted into the screening wall (1) in such a way that its trough openings (5, 6) which point upwards are arranged, on the one hand, on one side of the screening wall (1) and, on the other hand, on the other side of the screening wall (1), the emptying opening (7) for the bulk material (12) being arranged at a deeper section of the trough-shaped cable penetration (3). The cable lead-through for screening walls is suitable, because of its simple and quick handling, for high-frequency-insulated test rooms and other screened rooms, for example television studios and power stations. <IMAGE>

Description

The invention relates to a radio frequency-tight cable bushing for shielding walls, with cable entry and screen wall are in a highly conductive connection, and the shielding of the cables in the area of the cable are exposed and with the cable entry an electrically conductive medium is galvanically connected are.

EMC laboratory tests on systems or their compo is carried out in an RF-tight measuring room. The test equipment located outside the measuring room, Prüfge councils and other components of the systems are a lot core shielded special cables with the device under test Measurement room connected. A high screen quality of the measuring room can be achieved by performing in the area the exposed and all around contacted shield The cables are highly conductive and sealed using a electrically conductive medium connected to the screen wall will.

From DE-PS 29 09 890 it is known in the field the implementation of exposed shielding of the cables to enclose by electrically conductive fittings. There At, however, it is necessary to make a difference for everyone outer cable diameter a special fitting keep it. The availability of fittings is still difficult because some fittings for the purpose of place saving several cables.  

The cable entries are particularly useful in measuring rooms changed frequently. The handling with the fittings is too cumbersome and the long changeover times when measuring construction block the expensive measuring room, like the following example game shows.

Since often additional measuring cables with larger plugs their ends must be passed through the shielding wall the entire cable duct is disassembled and then re-assembling the fittings again be built or the cable connectors are new several times adapt.

Are the previously known cable bushings z. B. in Use shelters or in power plants for a long time aging processes can be shielded impairment.

The invention has for its object the cable through training with high shielding effect so that the Cables can be exchanged, removed or removed quickly and easily can be added.

This object is achieved in that the electrically conductive medium through a con constant immutable bulk goods can be represented where at the cable entry itself trough-shaped and with the Bulk goods can be filled and emptied.

The advantages achieved with the invention are in particular special in that the cable is quick and easy are changeable, removable or addable at high Shielding effect. This eliminates the long set-up times the measurement setup and the expensive measuring room can be better be burdened. By a suitable selection of the bulk  the shielding effect becomes good according to the environment not affected by aging processes.

According to one embodiment of the invention, one receives simple inexpensive construction if the trough moderate cable entry into the screen wall is that its trough openings pointing upwards one half on one side of the screen and the other half on the other side of the shield wall are arranged.

After passing the cables through the trough-shaped Cable entry is this with electrically conductive Bulk filled. The discharge opening of the bulk good is conveniently arranged on a lower one Section of the trough-shaped cable passage.

The Zugent attached to the trough-shaped cable passage burdens, among themselves and with the exposed Ab shields of the cables are highly conductive, first ensure a stable position of the cables, and continue for a low coupling resistance in low frequency range.

The electrically conductive dust protection flaps cover the Trough openings. As a result, the bulk material is free from vermin protected.

A division of the trough-shaped can be useful Cable entry into several chambers, each Chamber can be filled and emptied individually with bulk material. As a result, it is easily possible to add additional to a measurement conversion cable, without having to carry out a Empty all of the bulk goods beforehand.  

Electrically highly conductive materials are suitable for the bulk material Materials such as B. copper granules. The grain size can here vary between very fine and coarse. As well can use mixtures of different grain sizes to optimize the contact resistance.

An embodiment of the invention is based on the Drawing shown in more detail. Show it

Fig. 1 is a high-frequency sealed cable bushing (body only) in a perspective view,

Fig. 2 shows a high-frequency-tight cable bushing in a side view as a section.

A high-frequency-tight cable entry for shielding walls, with the cable entry and the shielding wall in a highly conductive connection, and the shielding of the cables in the area of the cable entry are exposed and are electrically connected to the cable entry through an electrically conductive medium, is described below using a trough-shaped cable entry ben, the electrically conductive medium can be represented by a consistency of bulk 12 , and the trough-shaped cable passage 3 can be filled and emptied with the bulk 12 .

Fig. 1 shows the geometric shape of the trough-shaped Ka beldurchgangses, the trough opening 5 , the Entleerungsöff voltage 7 and the dust flaps 10 and 11th The BEFE stigungsbohrungen 13 make the mechanical connection to the shield 1 . Additional soldering reduces the coupling resistance.

The section in FIG. 2 shows further details.

The cables are guided through a trough-shaped cable passage arranged in the shielding wall 1 with electrically conductive bulk material 12, which can be filled and emptied. This is connected in a highly conductive manner to the shielding wall, the two upwardly pointing trough openings 5 and 6 of which are arranged on one side of the shielding wall 1 with the emptying opening 7 of the bulk material being arranged at a lower trough section.

The conductive connection of the metal granules upwards and thus the closure of the opening in the screen wall is produced by a suitable shape 14 .

The cable strain reliefs 8 and 9 attached to the trough-shaped cable passage 3 are connected to one another and to the exposed shields 2 of the cables in a highly conductive manner. The trough openings 4 and 6 can be covered by electrically conductive dust protection flaps 10 and 11 . Metal granulate is suitable as bulk material 12 .

The shielding device described above can of course, can be varied and modified as desired. So can the trough-shaped cable passage in several chambers be divided, each chamber individually with bulk can be easily filled and emptied. Furthermore, e.g. B. the trough-shaped cable passage, the trough shape or the Cable strain relief to the installation site (installation in a corner, Installation on the floor, ...) must be adapted. This can even be too complete integration with the shielding wall.  

The following description of an area surrounded with a shielding one measuring space using the example of how such a simple way. B. can lay an additional shielded measuring cable with a plug attached to its end from the inside of the measuring space through the shielding wall to a test device lying outside the measuring space. The trough-shaped cable passage 3 is dimensioned so that even larger special plugs can be passed easily. After opening the Ent emptying opening 7 one catches the bulk material 12 for reuse. One partially removes the outer insulation layer of the measuring cable, so that the shielding of the measuring cable is exposed in the area of the cable bushing from the shield wall 1 . Now the measuring cable can be led with the plug first through the trough-shaped cable duct.

So that the electromagnetic waves do not come from outside through the still open cable entry into the measuring room can penetrate, you fill the trough-shaped cable through guidance complete and tight with the conductive bulk Good. This will shield the cables all around contacts with the bulk material, which creates an extreme low coupling resistance with the screen wall of the Measurement room results.  

Legend

1 screen
2 cable shields
3 Trough-shaped cable entry
5, 6 trough openings
7 drain opening
8, 9 cable strain reliefs
10, 11 dust protection flaps
12 bulk material
13 mounting hole
14 Upper formation of the trough-shaped device

Claims (6)

1. High-frequency-tight cable entry for shielding walls, the cable passage and shielding wall are in a highly conductive connection, and the shields of the cables are exposed in the area of the cable passage and are galvanically connected to the cable passage via an electrically conductive medium, characterized in that the electrically conductive medium a consistency of bulk material ( 12 ) can be represented, the cable passage itself being trough-shaped and with the bulk material ( 12 ) being fillable and emptying. 2. Cable passage according to claim 1, characterized in that the trough-shaped cable passage ( 3 ) in the shield wall from ( 1 ) is let in that its upwardly pointing trough openings ( 5 , 6 ) to one half on one side of the shielding wall ( 1 ) and the other half are arranged on the other side of the shielding wall ( 1 ), the emptying opening ( 7 ) of the bulk material ( 12 ) being arranged on a lower-lying section of the trough-shaped cable passage ( 3 ). 3. Cable passage according to claim 1 or 2, characterized in that the trough-shaped cable passage ( 3 ) attached cable strain reliefs ( 8 , 9 ) with each other and with the exposed shields ( 2 ) of the cables are connected in a highly conductive manner. 4. Cable passage according to claim 2 or 3, characterized in that the trough openings ( 5 , 6 ) can be covered by electrically conductive dust protection flaps ( 10 , 11 ). 5. Cable passage according to one of claims 1 to 4, characterized in that the trough-shaped cable passage ( 3 ) is divided into several chambers, each chamber being individually fillable and emptied with bulk material ( 12 ). 6. Cable passage according to one of claims 1 to 5, characterized in that the bulk material ( 12 ) consists of metal granules.