Ventilation – Workstation ventilator
Patent
1992-08-13
1994-06-21
Joyce, Harold
Ventilation
Workstation ventilator
55337, 55440, 126299R, 454339, 454345, F24C 1520, B08B 1500
Patent
active
053224701
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the ventilation apparatus.
In the prior art there are known ventilation arrangements which are installed in the ceiling of the room, and where the ventilation is realized by using air exhaustion means arranged inside a hood. In connection with the ventilation arrangement, there is installed, generally at an oblique angle, filtering cells, particularly degreasing cells. The purpose of the filtering is to separate contaminations from the exhaust air and to prevent harmful and inflammable materials in particular from entering the ventilation system. Such ventilation arrangements are introduced for instance in the publications DE-A 3,309,208 and U.S. Pat. No. 3,800,689.
The problem with the existing arrangements is that they are applicable only locally. Normally the hood, for example in a kitchen, is installed above the stove, and its purpose is exactly to collect the vapours and fumes created by cooking, and to remove these from the kitchen.
Another drawback with the known devices is that the employed degreasing cells are difficult to keep clean.
in the prior art there are also known so-called false ceiling arrangements, which advantageously cover the whole kitchen or the corresponding ceiling. The input air is conducted to the space from the peripheral areas thereof. Such ventilation arrangements are introduced for instance in the publications DE-A 2,718,611 and U.S. Pat. No. 4,354,863.
A drawback with these arrangements is that the rising air streams containing impurities can proceed unobstructed along the ceiling surface, which consequently increases the exhaust air currents.
Another drawback with these known arrangements is that from the essentially horizontal filter elements, impurities such as water, grease etc. drop on the floor and on the equipment arranged in the room, for instance on stoves.
Yet another drawback is the feeding of input air to the space in question. It is difficult to be arranged effectively.
Another drawback is the fact that noise and sounds in general can freely proceed in the described false ceiling arrangements. Hence, from the point of view of acoustics, the false ceiling arrangements are unsatisfactory.
The object of the present invention is to eliminate the above described drawbacks. A particular object of the invention is to realize a ventilation apparatus for demanding room spaces, which apparatus is flexible in installation and easy to maintain.
The ventilation apparatus of the invention is characterized by the novel features enlisted in the appended patent claim 1.
The ventilation apparatus of the invention comprises at least one wall element directed essentially downwardly from the ceiling, which wall element is composed of a number of elongate parts provided with vertical chambers, the shell of these parts containing inlet apertures, through which apertures and chambers the exhaust air is conducted out of the space in question.
In a preferred embodiment of the apparatus, the inlet apertures are arranged on both sides of the wall element.
In another preferred embodiment of the invention, the wall element is detachably secured to the ceiling.
In another preferred embodiment of the invention, the wall element is formed of at least one module.
In another preferred embodiment of the invention, in conjunction with the wall element, there is arranged a filter.
In another preferred embodiment of the invention, each module includes a top plate, whereby the module can be secured to the ceiling, to corresponding fastening rails in connection with the ventilation duct network.
In another preferred embodiment of the invention, in between the ventilation duct network and the module, there is provided a filter supported against the fastening rails, at the bottom edge whereof there is arranged another set of rails to which the module is secured.
In another preferred embodiment of the invention, each wall element is formed as a filter comprising a cylindrical chamber, the inlet apertures whereof are shaped as at least roughly vertical slots in the top par
REFERENCES:
patent: 3393497 (1968-07-01), Donnelly
patent: 3508383 (1970-04-01), Humbert, Jr. et al.
patent: 3800689 (1982-06-01), Brown
patent: 4354863 (1982-10-01), Oleszak
patent: 4504292 (1985-03-01), Vohringer
Korhonen Kaarlo
Vartiainen Seppo
Jeven Oy
Joyce Harold
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