Ventilated housing

Details Ventilated housing Ventilated housing

1999-03-11

2001-10-30

Joyce, Harold (Department: 3749)

Ventilation

Electronic cabinet

C361S695000

Reexamination Certificate

active

06309296

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention concerns a ventilated housing for the accommodation of electrical and electronics components comprising of an inner wall, external wall, intake for fresh air which leads into the gap between the inner wall and the external wall, outlet for the exhaust from the gap, and a ventilation opening with an air filter for fresh air.
Housings and equipment cabinets for electrical and electronic devices containing double walls are customary. Such cabinets are preferably intended for external application, given variable external conditions, they are used to ensure a permanent trouble-free operation of the inserted electrical and electronic systems. The removal of the components dissipated heat takes place in a simple way via the application of the chimney flue-effect due to the constructive layout of the cabinets (DE 348,794, DE 295 19 260, EP 0810704).
In order to prevent the penetration of air pollution such as dust, foreign bodies, insects etc. into the inside of the housing, which can lead to operational disturbances, air filters are absolutely necessary (DE 196 23 677).
The air filters however may not obstruct the thermionics in the gap between the outside and the internal covering of the housing, which is designated for air circulation. This demand can be only fulfilled if the filter surfaces are laid out with enough space in order to avoid air congestion.
Also ventilated housings or cabinets are subjected to standards regarding their external dimensions as well as their internal dimensions. These dimensions must be selected such that they permit problem-free installation of standard components, for instance those in the shape of modules or module carriers. The space available to install larger filter surfaces in the housing is therefore mostly very limited. An enlargement of the intermediate space quickly reaches its boundaries.
SUMMARY
The task of the invention exists in the conception of an air filter, which despite large filter surface needs only very little room for its installation in the housing.
For the solution of the task one proceeds from a double-walled, ventilated housing of the type mentioned above. The task is solved by the following technical features: The ventilation opening is in the inner wall, the air filter sits before the ventilation opening in the gap as the air filter serves as a filter cartridge, the filter cartridge surrounds the ventilation opening and is clamped between the inner wall and external wall.
In this suggested air filter, the selected diameter of the cylindrical filter cartridge crucially determines the size of the filter surface, which corresponds to the lateral area of the cartridge. This diameter may exceed the width of the ventilation opening, resulting in a large effective surface for the air filter.
It is favorable if the filter cartridge possesses the form of a cylindrical socket, which clamps between the inner wall and the external wall with its edges sealing on them.
A further development of the invention is a cylindrical supporting lattice, onto which the filter cartridge is pushed. This supporting lattice also stabilizes the position of the filter cartridge when the formation of a certain negative pressure occurs before the ventilation opening.
Appropriately the supporting lattice is located on an assembly ring, which is fastened to the edge of the ventilation opening and is removable.
So that the filter cartridge can be easily changed, a service opening is formed, whose inside diameter is larger than the outside diameter of the assembly ring. This service opening can be closed by a removable cover and corresponds to the ventilation opening at the external wall.


REFERENCES:
patent: 4618071 (1986-10-01), Vincent
patent: 5573562 (1996-11-01), Schauwecker et al.
patent: 5575832 (1996-11-01), Boyd
patent: 5646823 (1997-07-01), Amori
patent: 5688169 (1997-11-01), Duong et al.
patent: 6052282 (2000-04-01), Sugiyama et al.
patent: 6088225 (2000-07-01), Parry et al.
patent: 348794 (1920-08-01), None
patent: 295 19 260 U1 (1996-03-01), None
patent: 196 23 677 A1 (1997-12-01), None
patent: 0 810 704 A2 (1997-12-01), None

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