Stoves and furnaces – Stove hoods
Patent
1992-06-19
1994-06-28
Joyce, Harold
Stoves and furnaces
Stove hoods
454 67, 454248, F24C 1520
Patent
active
053237617
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the ventilation apparatus.
In the prior art there is known, from the FI patent publication 74,799, a ventilation apparatus comprising a hood structure. It is deigned particularly for the ventilation of kitchen spaces. The ventilation apparatus is formed of a box-like unit which is rectangular in cross-section, and is arranged In connection to the hood so that from one side surface of the hood, fresh air is distributed into the room space. The exhaust air apparatus is fitted inside the hood.
A drawback with the above described ventilation apparatus is that the inlet air device is installed completely inside the hood structure and thus takes up space in the hood. This kind of inlet air apparatus can also not be arranged on adjacent sides of the hood.
Another drawback is that fresh air is conducted from the inlet air apparatus through the planar air distribution surface directly into the room space, in which case the possibilities for directing the stream of fresh air are limited. The directing requires additional structures such as guiding members, and/or closing of the holes on the outer surface, in the direction where the air stream is not wished to be directed to.
Yet another drawback is that the structures used for evening out the inlet air cause great pressure losses and increase the noise level remarkably.
Yet another drawback is that to adjust the size of the inlet air stream and to distribute it evenly through the long air distribution surfaces to the room space is troublesome.
Yet another drawback is that the air distribution surface is difficult to dismount for cleaning and maintenance.
The object of the invention is to eliminate the above described drawbacks.
A particular object of the invention is to introduce a new ventilation apparatus whereby ventilation is made to function effectively in demanding circumstances, such as catering-size kitchens, and which apparatus is easily realized and modified.
The ventilation apparatus of the invention is characterized by the novel features enlisted in the patent claim 1.
The ventilation apparatus of the invention includes an inlet air device, an exhaust air device and a mantle, which constitutes a hood where the air to be discharged is collected, and where from it is discharged by means of the exhaust air device, the said inlet air device comprising an air distribution chamber, provided with an air distribution surface in connection with the mantle; fresh inlet air is brought into the said air distribution chamber and is distributed to the air-conditioned space through the air distribution surface. According to the invention, the inlet air device is formed of a number of inlet air units, which are installed at regular intervals from each other, and each inlet air unit includes an inlet surface which is arranged in connection with the mantle, as well as an air distribution surface projected from the inlet surface, which air distribution surface is partly permeable to air.
In a preferred embodiment of the apparatus, on the inlet surface of the inlet air unit there is arranged at least one aperture zone, which is relatively narrow with respect to the width of the inlet surface. By means of this aperture zone, both the amount of air and above all the air distribution pattern are adjusted.
In another preferred embodiment of the apparatus, the air distribution chamber of the inlet air unit, the air distribution chamber and its air distribution surface are elongate in form, the inlet surface is parallel to the lengthwise axis of the air distribution chamber, and the inlet surface comprises at least one aperture zone parallel to the lengthwise axis. This kind of inlet air unit is particularly suited for ventilation apparatuses attached to the ceiling, in which case the unit is generally extended from the top end of the hood to the free bottom end thereof. Naturally the air distribution chamber and the air distribution surface thereof may also be of some other shape, for instance essentially round in cross-section on the plane of the inlet
REFERENCES:
patent: 3363532 (1968-01-01), Horneff
patent: 3457850 (1969-07-01), Sweet et al.
patent: 4373509 (1983-02-01), Neitzel et al.
patent: 4407266 (1983-10-01), Molitor
patent: 4709623 (1987-12-01), Roth et al.
Jeven Oy
Joyce Harold
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