DE3416692A1 - Extractor hood for large kitchens - Google Patents

Abstract

An extractor hood for large kitchens having special filtering zones, namely a prefractionater with spray cleaner, a nebulising chamber with solvent mist, a wet filter for separating droplet-bound vapours, a dry filter for separating steam-bound vapours and circulation drying. The invention is intended considerably to reduce the quantity of exhaust air necessary and thus have an environmentally friendly and energy-saving effect. Additionally, the equipment costs are reduced due to unrequired exhaust air shafts. <IMAGE>

Description

Extraction hood for large kitchens

The invention relates to a suction hood as described in the preamble of the claim 1 mentioned Art.

In known hoods of the type in question are vapors in so-called Grease filters, mostly made of aluminum fabric, filtered out.

The disadvantage, in addition to the low effectiveness, is the high maintenance required for cleaning the filters and the inner surfaces of the hood.

Another disadvantage of the known hoods is the high environmental impact, which results from the emission of large amounts of insufficiently purified air, especially if the filter efficiency decreases after lack of maintenance.

In addition, a considerable amount of air is required for the large quantities of air required Expenditure of operating and heating energy to be taken into account.

The invention should have a better filter effect, with the least amount of maintenance, limit the environmental impact of exhaust air.

In addition, an energy saving is to be achieved in that a large part of the suction air (cleaned) is blown back into the room, thus the Exhaust air volume is reduced or becomes unnecessary.

This object is achieved in that coarse in a pre-separator Particles such as B. fat dust, water droplets, dust ect., Deposited by centrifugal force will. The separated substances are constantly being sprayed on the back of the pre-separator washed away without the spray penetrating the pre-separator front.

Nozzles, which exit an open circuit, take care of the spraying are whose content z. B. can be water with additives.

At the tear-off edges of the pre-separator there are small Droplets entrained, so that a fog zone is created in the following chamber, in the residual fumes bind with the mist.

The binding is then eliminated in the wet filter and runs back into the collecting basin of the circuit.

The air that has escaped here enters the dry filter, which is also used can condense out further residual vapors with external cooling. With external cooling This is followed by a regulated drying of the air for the circulating air mode, i.e. H.

the "exhaust air" can stay in the building. The condensate produced here also runs into the collecting basin of the circuit.

For the recirculation mode, also with part or all of the exhaust air a built-in fan.

Before the circulating air gets back into the room or the building, there is the possibility of odor filtering, e.g. B. with activated carbon.

Explanation of the embodiment shown in the drawing: Fig. Figure 1 is a section through the suction hood. Figure 2 is a section through the pre-separator In Fig. 1, a suction hood 1 is shown, partially in section, the pre-separator 2, which is sprayed from behind. The spray nozzles 5 are arranged so that the entire area of the pre-separator is sprayed.

The spray pressure and pre-separator are coordinated so that strikethrough for the spray is not possible.

Vapors bind in the pre-separator 2 and in the mist chamber 12 the spray.

This bond runs on the inner walls of the pre-separator 2 and the Extraction hood 1 into collecting basin 3. From here, via connection 4, by means of a pump, the whole is fed back as a spray to the spray nozzles 5, so that an open one Cycle results.

The wet filter 6 provides another separation, also from here the deposit flows back into collecting basin 3.

A subsequent separation takes place in the dry filter 7, which with an introduced coolant acts as a condenser and dries the air.

Air transport is done by blower 8 or an external blower.

The amount of air can be divided into a circulating air flow through an odor filter 10 by louvre flap 11, the odor filter 10 can also be omitted, as well as into an exhaust air flow, which can be regulated according to the desired indoor air quality is.

The efficiency of the fan can be optimized via bypass 13. At the same time, the amount of bypass air is fed to a further filter passage and so A diffusion of the room air that is above is also achieved with the flow apron 14 of the storage space 15 is located.

Fig. 2 is a sectional view of the profile arrangement of the pre-separator.

The air deflectors 16 get a pre-separation, which without special Maintenance or interventions in the entire device must be cleaned from the outside.

The air deflectors 17 provides a further preliminary separation, which is constantly sprayed and rinsed from the inside - mist chamber side 12.

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Claims (5)

Suction hood for large kitchens Requirements: 0.} Extraction hood for kitchen vapors for the suction and filtering of a fluid, in particular kitchen vapors, with a profiled housing and filter zones accommodated therein; d a d u r c h g e k It is noted that a pre-separator (2) with a cleaning liquid is sprayed. 2. Extraction hood according to claim 1, d a d u r c h g e k e n n z e i c h n e t that a wet filter (6) is arranged after the mist chamber (12). 3. Extraction hood according to claim 1, d a d u r c h g e k e n n z e i c h n e t that a dry filter (7) is arranged after the wet filter (6). 4. Extraction hood according to claim 1, d a d u r c h g e k e n n z e i c h n e t that an odor filter (10) is arranged after the dry filter (7). 5. Extraction hood according to claim 1, d a d u r c h g e k e n n z e i c n e t that a fan (8) is installed.