Gas separation – Combined or convertible – Involving communication receiving or transmitting apparatus
Patent
1997-11-24
1999-08-03
Chiesa, Richard L.
Gas separation
Combined or convertible
Involving communication receiving or transmitting apparatus
55471, 55486, 55502, 454184, B01D 3502
Patent
active
059319798
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to filter ventilator, which is installed into a slot of a mounting plate, in a high frequency (HF)-sealed manner.
2. Description of Prior Art
When installing a filter ventilator into a slot of a mounting plate used as a switchgear cabinet, in connection with certain applications, there is the need for a definite HF seal also in the area of the filter ventilator. This is particularly required in a switchgear cabinet which is sealed HF-tight.
SUMMARY OF THE INVENTION
It is one object of this invention to achieve a definite HF seal with a simple construction and a simple installation of the filter ventilator.
This object is attained with a housing having an electrically conductive coating which projects with a receiving element through a slot in a mounting plate and is connected with the mounting plate with a flange and with the interposition of an electrically conducting adhesive around the slot of the mounting plate. With the interposition of a wire screen, a ventilator is connected with the receiving element of the housing projecting through the slot. The filter mat is inserted into the receiving element of the housing and is covered by a laminated grid.
The electrically conductive housing and the electrically conductive wire screen cover the slot of the mounting plate in an HF-tight manner, and the adhesive layer placed between the flange of the housing and the mounting plate seals a transition area between the housing and the mounting plate, also in an HF-tight manner, to assure an absolutely HF-tight installation of the filter ventilator.
The installation of the filter ventilator is simpler and easier because a coat of the adhesive, which surrounds a corner area formed between the receiving element and the flange of the housing, is applied prior to inserting the housing into the slot in the mounting plate.
The connection between the housing and the mounting plate can be further improved if the flange of the housing is also bolted to the mounting plate, which has screw receptacles.
In accordance with one preferred embodiment the side of the receiving element of the housing facing the wire screen and the ventilator is embodied as a screen, and the filter mat can thus be supported in the receiving element of the housing without the housing unnecessarily restricting air flow.
The wire screen preferably has a fine mesh and is attached, together with the ventilator, to the receiving element of the housing.
In accordance with one method of this invention, the installation can be simplified if the ventilator, the wire screen and the housing are a prefabricated unit which, provided with the coat of electrically conductive adhesive, is connected with the mounting plate, and if the filter mat is inserted into the housing and covered with the laminated screen.
BRIEF DESCRIPTION OF THE DRAWING
This invention will be explained in greater detail when taken in view of the filter ventilator represented in an exploded view in the drawings.
DESCRIPTION OF PREFERRED EMBODIMENTS
The mounting plate 10 in the drawings can be a wall of a switchgear cabinet and has a slot 11. Screw receptacles 12 are inserted around the slot 11. One essential part of the filter ventilator is the housing 20, which has an electrically conductive coating. The housing 20 can be made of a plastic material and afterwards can be coated with the electrically conductive adhesive.
The housing 20 has a receiving element 21 and a flange 22 with fastening bores 23. The cup-shaped receiving element 21 corresponds to the slot 11 and is connected with a wire screen 16 and the ventilator 15 prior to being installed. The housing 20, the wire screen 16 and the ventilator 15 can be a prefabricated unit, which can be placed into the slot 11 of the mounting plate 10. A layer of an electrically conductive adhesive 24, enclosing the corner area formed between the receiving element 21 and the flange 22 of the housing 20, is applied prior to insertion. The prefabricated unit is bolted
REFERENCES:
patent: 4327398 (1982-04-01), Christison
patent: 4334899 (1982-06-01), McConnell
patent: 4744005 (1988-05-01), Milani
patent: 4781526 (1988-11-01), Mead
patent: 4926291 (1990-05-01), Sarraf
patent: 5007946 (1991-04-01), Babini
patent: 5101321 (1992-03-01), Remise et al.
patent: 5431974 (1995-07-01), Pierce
Carl Hanser Verlag, Elektro-chemisch Beschichten, Kunststoffe 84, (1994) 7, pp. 905, 906.
Leitfahige Metallklebebander, Elektroautomation 47, Jahrg., No. 9, (1994), p. 31.
EMV HF-Geschirmte Kabinen und Hallen, MWB Messwandler-Bau AG, Sep. 7, 1988, Wabenkamine/Beluftung.
Chiesa Richard L.
Rittal--Werk Rudolf Loh GmbH & Co. KG
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