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Title:
ELECTROSTATIC CONDENSATION SUCTION HOOD
Document Type and Number:
WIPO Patent Application WO/2020/110160
Kind Code:
A1
Abstract:
Described is a electrostatic condensation suction hood (1), designed to suck, by suction means (7) located inside the hood (1), flows of air at ambient temperature (G1, G2) and, separately, a flow of cooking vapours (F) introduced inside the hood (1) by means of one or more pipes (9) connected to a cooking oven. The hood (1) has abatement means (5, 10), condensation means (8) and filtration means (6, 11, 13), wherein the condensation means (8) are passed through by said flow of cooking vapours (F) and have internal gaps (17), which are passed through by the flow of cooking vapours (F), which is cooled by induction by at least one of the flows of air at ambient temperature (G1, G2), in such a way as to generate a water vapour condensate (H) which is collected in a tank (11). The filtration means (6, 11,13) include a filtration unit (6), which comprises an electrostatic abatement cell, to the inlet of which is sent the flow of cooled cooking vapours (F).

Inventors:
GRESELIN MAURIZIO (IT)
DAL PRA' ROBERT (IT)
Application Number:
PCT/IT2019/050247
Publication Date:
June 04, 2020
Filing Date:
November 26, 2019
Export Citation:
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Assignee:
EUROTECNICA S R L (IT)
DALPITECH S R L (IT)
International Classes:
F24C15/20
Foreign References:
CN103953956A2014-07-30
EP1530901A12005-05-18
US3837269A1974-09-24
US20080121224A12008-05-29
Attorney, Agent or Firm:
BURCHIELLI, Riccardo et al. (IT)
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Claims:
CLAIMS

1 . An electrostatic condensation suction hood (1 ), designed to carry out the suction, using suction means (7) installed inside the hood (1 ), of lows of air at ambient temperaure (G1 , G2) and, separately from said flows of air at ambient temperature, of a flow of cooking vapours (F), said flows of air at ambient temperature (G1 , G2) coming from the outside of the hood (1 ) through front and/or side openings of said hood (1 ) and said flow of cooking vapours (F) being introduced inside the hood (1 ) through one or more pipes (9) connected to a cooking oven, characterised in that said hood (1 ) has abatement means, condensation means (8) and filtration means (6), wherein said condensaion means (8) are passed through by sapid flow of cooking vapours (F) and have internal gaps (17), which are passed through by said flow of cooking vapours (F), which is cooled by induction by at least one of said flows of air at ambient temperature (G1 , G2), in such a way as to generate a water vapour condensate (FI) which is collected in a tank (1 1 ), and wherein said filtration means include a filtering unit (6), which comprises an electrostatic abatement cell, to the inlet of which is sent said flow of cooking vapours (F) cooled by induction by said at least one flows of air at ambient temperature (G1 , G2).

2. The suction hood (1 ) according to claim 1 , characterised in that said filtring uni (6) is located immediately downstream of said condensation means (8).

3. The suction hood (1 ) according to any one of the previous claims, characterised in that said filtering unit (6) has, upstream of said electrostatic abatement cell, a metal mesh filter designed to homogenise said flow of cooled cooking vapours (F).

4. The suction hood (1 ) according to any one of the previous claims, characterised in that flowing out from said filtering unit (6) there are flows of air (G1 , G2) and flows of cooking vapour (F) with a low water content, which are discharged behind the hood (1 ) using said suction means (7).

5. The suction hood (1 ) according to any one of the previous claims, characterised in that said hood (1 ) has an upper panel (16), a lower panel (2), an inner panel (14, 15) for separating said filetering means (6, 1 1 , 13) and a compartment (12) containing the operating circuits (5, 10) of said suction means (7).

6. The suction hood (1 ) according to any one of the previous claims, characterised in that said suction means (7) include a first motor or centrifugal elecric fan (7).

7. The suction hood (1 ) according to any one of the previous claims, characterised in that it comprises a diffusor or expansion vessel (81 ) positioned between said condensation means (8) and said filtration means, said flow (F) of cooking vapours passing through said diffusore (81 ) in such a way as to change to a predetermined temperature.

8. The suction hood (1 ) according to claim 7, characterised in that said flow (F) of cooking vapours is sucked through at least one pipe (91 ) positioned at the rear portion of the hood (1 ).

9. The suction hood (1 ) according to any one of the previous claims, characterised in that there is a second motor or electric fan (70) designed to suck at least one of said flows of air (G1 ), in order to increas the heat exchange of said flew (F) of vapours, without mixing with said flow (F) of vapours.

10. The suction hood (1 ) according to any one of the previous claims, characterised in that t comprises gaskets or seal elements (30) and/or a bulkhead (72) from which escpaes the air discharged close to a rear zone of the hood (1 ).

Description:
ELECTROSTATIC CONDENSATION SUCTION HOOD

This invention relates in general to a device for cleaving air of grease and cooking fumes and, more in particular, it refers to an electrostatic condensation suction hood.

It is known from the prior art that the method for the abatement of fumes normally occurs by means of molecular absorption filters using active carbon or other substances; inertial mechanical filtration methods are also used by means of filters of a synthetic and/or metallic nature, filters which use electrostatic abatement principles and/or filters for the abatement of fumes using water (“scrubbers”).

However, the teachings of the background art do not provide procedures of an adequate type for the abatement of grease and cooking fumes and make it necessary to continuously replace the filters, as well as using considerable quantities of washing water.

The aim of the invention is therefore to overcome the above-mentioned drawbacks and, in particular, to make an electrostatic condensation suction hood which improves the abatement of the particles of fumes which are a grouped together into water vapour agglomerates, generated during the cooking of the food.

Another aim of the invention is to provide an electrostatic condensation suction hood, which allows the cleaning of the air in general to be improved, without the continuous replacement of mechanical filters (synthetic and/or metallic filters) and/or the replacement of molecular absorption filters (active carbon).

Another aim of the invention is to make an electrostatic condensation suction hood which allows a significant reduction in the use of considerable quantities of water to be achieved with relative disposal of washing sludge. These and other aims, according to the invention, are achieved by making an electrostatic condensation suction hood according to appended claim 1 ; other detailed characteristics are described in the dependent claims.

Further characteristics and advantages of the electrostatic condensation suction hood, according to the invention, will more fully emerge from the description that follows, relative to a preferred embodiment thereof given by way of non-limiting example of the suction hood in question, referred to in the appended drawings, in which:

- Figure 1 shows a front view of the electrostatic condensation suction hood according to the invention;

- Figure 2 shows a side view of the electrostatic condensation suction hood according to the invention;

- Figure 3 shows a top view of the electrostatic condensation suction hood according to the invention;

- - Figure 4 shows an exploded view of the electrostatic condensation suction hood according to the invention;

- Figure 5 shows a top view partly in cross section and highlighting the air flow paths of the suction hood according to the invention;

- Figure 6 is a section view through the line VI-VI of Figure 5;

- Figure 7 is a section view through the line VII-VII of Figure 5;

- Figure 8 is an enlarged view of the detail labelled A in Figure 7;

- Figure 9A is a plan view of a second embodiment of the suction hood according to this invention;

- Figure 9B is a rear view of the embodiment of Figure 9A;

- Figure 9C is a section view through the line B-B of the embodiment of Figure 9A;

- Figure 9D is a perspective view of the embodiment of Figures 9A, 9B and 9C;

- Figure 10 is an exploded perspective view of the embodiment of Figures 9A-9D.

With reference to the drawings, the electrostatic condensation suction hood according to the invention is indicated generically by the numeral 1 .

Advantageously, the suction hood 1 is applied to cooking apparatuses, which, during the cooking step, produce water vapour, oily smoke and fumes.

For this purpose, the hood 1 is advantageously located above the cooking oven for optimisation of the space available and, by means of an opening located in the front part, it sucks air at ambient temperature through a specific conduit (flow indicated with G2 in the accompanying drawings), whilst the cooking vapours coming from the oven (flow indicated with F in the accompanying drawings) are introduced in the hood 1 by means of one or more pipes 9 connected to the underlying oven. A further flow of air at ambient temperature (flow indicated with G1 in the accompanying drawings) is sucked inside the hood 1 through a side opening and specific panels. The above-mentioned vapour flows F and ambient air flows G1 , G2 are sucked by a motor or centrifugal electric fan 7 installed inside the hood 1 and follow separate paths inside the hood 1 , in such a way that the vapour and the ambient air are not mixed.

The casing of the suction hood 1 houses an air abatement and suction system, as well as a primary air condensation and an electrostatic filtration system.

In particular, the casing of the suction hood 1 consists of an upper panel 16, a lower panel 2, an internal separator panel 15 and the motor or centrifugal electric suction fan 7, which is connected to a support panel 3 and to a compartment 12 containing the operating circuits; the compartment 12 is also adjacent to a panel 4 supporting electrical contacts 5 and the microswitch 10.

The casing of the hood 1 also includes and inner door 14 for access to a filtering compartment, which forms the electrostatic filtration system of the hood 1 , containing a diffusor 13, a tank 1 1 for collection of the condensate and a filtration unit 6.

Moreover, in a position adjacent to the door 14 and facing outwards and having a condenser 8, which constitutes the main element of the primary air condensation system of the hood 1 .

In practice, the flow of vapour F loaded with oily particles and smoke, which transits in the pipe 9, is initially sent to the condenser 8, which has internal gaps 17, which are passed through by the above-mentioned flow of vapour F and cooled by induction by the flow of ambient air G1 .

The contact between the flow of vapour F and the flow of ambient air G1 , which is colder, which touches the gaps 17, generates the condensation of the water vapours H, which is collected in the underlying tank 1 1 . The flow of air G2 and the flow of vapour F leaving the condenser 8 are sent to the filtration unit 6, installed immediately downstream of the condenser 8, where they firstly pass through a metallic mesh pre-filter for homogenisation of the flow, then they pass through an electrostatic abatement cell and they are then discharged from the rear part 18 of the hood 1 , thanks to the action of the centrifugal electric fan 7 installed downstream of the condenser 8 and the entire filtration unit 6.

In this way, the filtration unit 6 efficiently separates the particles of grease and oil present in the vapours F, also because low temperature dry air is sent to the inlet of the filtration unit 6 by the condenser 8, under these conditions, the operation of the filtration unit 6 is optimal.

Figures 9A, 9B, 9C, 9D and 10 show a variant embodiment of the suction hood 1 according to the invention in the“sealed chamber” version, wherein the flow F of vapour to be cleaned is sucked by the electric fan 7 through pipes 91 and enters in the condenser 8 in the direction indicated in Figure 9C.

Subsequently, the flow of vapour F passes through a diffusor or expansion vessel 81 to be brought to the temperature suitable for the electrostatic cell of the filtration unit 6 or to a temperature which improves the efficiency of the hood 1 , which performs the correct filtration according to known principles.

Lastly, the filtered air subsequently leaves clean from a discharge 71 .

The drawings showing this particular embodiment clearly show a second motor or electric fan 70 designed for the suction of the flow of ambient air G1 , which increases the heat exchange of the flow F without, however, mixing with it.

The condensate water is collected in the tank 1 1 for collection of the condensate liquids and disposed of through a further pipe 90.

All the components are suitably enclosed by the upper panel 16, by the lower panel 2, by side panels and by rear panel, together with a closing panel 20.

In all the variants of the invention there can also be gaskets or seal elements 30, together with a panel 72 for the air expelled close to the rear zone of the hood 1.

It has been found how the solution according to the invention allows the preset aims to be achieved and, in particular, achieves evident advantages, joining together two molecular separation systems of the sucked air.

In particular, the first system comprises the condensation of the sucked vapour, which is the main condition for the second system for molecular abatement by electrostatic filtration to operate correctly, since a high concentration of water mixed with respect to quantity by volume of air sucked can lead to the application of high voltage at the blades of the high voltage cell, thereby causing the short-circuit and annulling the desired filtration.

Experimental laboratory tests have confirmed that the fumes discharged from the hood contain a concentration of particles of smoke, water and odours which is significantly less than that of the flows sucked in.

The characteristics of the electrostatic condensation suction hood, according to the invention, clearly emerge from the description, as do the advantages thereof.

Lastly, it is clear that numerous variants might be made to the suction hood in question, without forsaking the principles of novelty of the inventive idea according to the accompanying claims, while it is clear that in the practical actuation of the invention, the materials, the shapes and the dimensions of the illustrated details can be of any type according to requirements, and can be replaced by other technically equivalent elements.