Ventilation – Workstation ventilator – Having inlet airway
Patent
1991-09-25
1994-05-17
Joyce, Harold
Ventilation
Workstation ventilator
Having inlet airway
126299R, 454252, F24F 710
Patent
active
053122968
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a false-ceiling construction and a method for the flow of air in connection with a false-ceiling construction.
The installation of intake air devices, exhaust air devices, electric fittings and other technical means in rooms frequently causes great difficulties, especially in the case of after-installation. The object of the present invention is to provide a ceiling construction of a novel type, which operates as a so-called technical ceiling and comprises exhaust and intake air units, lighting, electricity, and regulators or air quantity, to be installed in a modular way.
In prior art, the use of a false-ceiling construction is known. However, the prior-art false-ceiling constructions do not permit modular installation of intake and exhaust air equipment.
The object of the invention is to provide a false-ceiling construction intended in particular for institutional kitchens and equivalent, comprising an exhaust air unit and an intake air unit. Through the exhaust air unit, the impurities produced on the making of food in the kitchen are sucked off, while the exhaust air unit includes a fat filter, which performs the filtering of the impurities. In the invention, it has been realized to form a false-ceiling construction whose intake air unit includes at least one such duct opening through which a carrier-air and trap-air jet is produced towards the fat filters in the exhaust air unit. Thus, in the false-ceiling construction in accordance with the invention, the impurities cannot be gathered in the space between the exhaust air unit and the intake air unit at the proximity of the ceiling module placed between said units. The trap-air jet efficiently guides the impurities and/or the excess heat produced at the food-making sites placed below the exhaust air unit in the kitchen space to the fat filters, and in this way a gathering of the impurities at the proximity of the ceiling module in the top portion of the room space is prevented.
In the method in accordance with the invention, it has been realized to make use of a trap-air or carrier-air jet, which is directed as parallel to the surface plane of the ceiling module or as slightly inclined towards the exhaust air opening of the exhaust air unit and towards the fat filters placed in same. The intake air unit can also be placed so that the carrier-air jet opening on the intake air unit is placed at a level somewhat lower than the level of the fat filters, in which case the carrier-air jet can be made to flow as slightly inclined upwards, and in this way the flow of impurities into the fat filters can be intensified further.
The false-ceiling construction in accordance with the invention is mainly characterized in that the false-ceiling construction includes at least one flow opening, passing from the intake air chamber in the intake air unit, for a trap-air jet for making the trap-air jet to flow as parallel to the plane of the false-ceiling plate or as slightly inclined in relation to said plane towards the exhaust air opening, placed on the exhaust air chamber, for the exhaust air flow, whereby, by means of the trap-air jet, contaminated air and/or excessive heat or excessive humidity rising from the sources of impurities in the room space is attracted towards the exhaust air unit, and in this way gathering of impurities and/or excessive heat and/or excessive humidity in the area between the intake air unit and the exhaust air unit at the proximity of the false-ceiling plate of the false-ceiling construction is prevented.
The method in accordance with the invention for the flow of air in connection with a false-ceiling construction is mainly characterized in that air is made to flow through the intake air unit into the room space so that it is directed from the intake air unit at a relatively high velocity as parallel to the plate plane of the false-ceiling plate or as slightly inclined in relation to said plate plane towards the opening for exhaust air flow, which opens into the exhaust air chamber in the exhaust air unit, whereby
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Aalto Erkki
Kyllonen Pekka
Pellinen Teuvo
Halton Oy
Joyce Harold
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