CH692516A5

CH692516A5 - Self-cleaning cooker hood includes a system for circulating a cleaning solution from a reservoir to a spraying device via a filter containing clay balls and back to the reservoir

Info

Publication number: CH692516A5
Application number: CH159598A
Authority: CH
Inventors: Olivier Giovanna
Original assignee: Giovanna Sa H
Priority date: 1998-07-29
Filing date: 1998-07-29
Publication date: 2002-07-15

Abstract

A self-cleaning hood for a cooker comprises a box having guides for leading air containing cooking vapor into a chamber into which cleaning solution from a reservoir is sprayed. The cleaning solution passes with aspirated air through a filter charged with clay balls, and is returned back to the reservoir. The cooker hood comprises a box (1) open at the bottom, a upper guide (2) and a lower guide (3) attached to the box and defining a passage (4) and a chamber (6, 7) in which the air is aspirated. The chamber comprises two parts divided by a vertical partition (8) and communicating at their upper ends. In the second part (7) of the chamber are located, from top to bottom, a spraying device (10), a filter (9) comprising clay balls, and a droplet separator (11). The lower portion of the second part (7) of the chamber comprises a lateral purified air outlet (13) and a cleaning solution outlet (12). The hood further comprises a cleaning solution reservoir (14) in which is collected the cleaning solution from the cleaning solution outlet by gravity, and which supplies the spraying device (10) by means of a pump (15). The pressure loss of the hood can be controlled by varying the thickness of the filter (9) comprising the clay balls. The cleaning solution contains enzymes that render grease water-soluble grease. The filter (9) comprising clay balls constitutes a flame arrester.

Description

       

  



  La présente invention concerne une hotte de cuisine qui permette de retenir les graisses et dont les filtres soient autonettoyants, c'est-à-dire qui puissent être nettoyés en position de service et pendant le fonctionnement de la hotte. 



  On connaît du brevet CH 683 597 de la titulaire une hotte munie d'un dispositif de nettoyage de sa grille-filtre. Ce dispositif de nettoyage est complexe et onéreux, car il comporte un chariot mobile d'aspersion de la grille-filtre. 



  Le but de la présente invention est la réalisation d'une hotte autonettoyante de fabrication simple, sans éléments mobiles et d'une efficacité renforcée. 



  La hotte autonettoyante selon la présente invention permet d'obtenir le but visé à l'aide des caractéristiques énumérées à la revendication 1. 



  Le dessin illustre schématiquement et à titre d'exemple une forme d'exécution de la hotte de cuisine autonettoyante selon l'invention. 
 
   La fig. 1 est une élévation frontale partiellement en coupe de la hotte. 
   La fig. 2 est une élévation latérale partiellement en coupe de la hotte. 
 



  La hotte illustrée à la fig. 1 comporte un caisson 1 ouvert à sa partie inférieure à l'intérieur duquel sont fixés un guide supérieur 2 et un guide inférieur 3. 



  Les deux guides 2 et 3 définissent un passage 4 par lequel sont aspirées les vapeurs et fumées provenant d'une cuisinière 5 située sous la hotte. 



  Ce passage 4 débouche dans une chambre, également délimitée par le caisson 1 et les guides 2 et 3, divisée en deux parties 6, 7 par une paroi verticale 8, ces deux parties 6, 7 communiquant entre elles par leurs extrémités supérieures. 



  La seconde partie 7 de la chambre 6, 7 comporte un filtre 9 à billes poreuses, par exemple des billes d'argile expansée, un dispositif d'aspersion 10 de ce filtre situé dans la portion supérieure de la partie 7 de la chambre 6, 7, un séparateur de gouttelettes 11, incliné, disposé sous le filtre 9. 



  La portion inférieure, de la partie 7 de la chambre 6, 7 comporte une évacuation par gravité 12 de la solution de nettoyage du filtre 9 et une évacuation latérale 13 de l'air purifié débouchant dans un canal latéral d'évacuation. 



  L'évacuation de la solution de nettoyage 12 ramène cette solution dans un réservoir 14. Une pompe 15 alimente le dispositif d'aspersion 10 à partir de la solution contenue dans ce réservoir 14. 



  Cette hotte est de fabrication et de conception particulièrement simples et elle permet une condensation des vapeurs et un nettoyage du filtre à billes en continu pendant le fonctionnement de la hotte. 



  En fonctionnement, l'air et la vapeur de cuisson aspirés par le passage sont acheminés par la partie 6 de la chambre 6, 7 au-dessus du filtre à billes 9. Le dispositif de dispersion 10 sert à condenser la vapeur et simultanément à amener la solution de nettoyage du filtre, solution d'enzymes rendant les graisses hydrosdubles. L'air traverse la portion supérieure de la partie 7 de la chambre 6, 7 où il est mis en contact avec la solution de nettoyage. 



  Le filtre 9 est composé d'un cadre en acier inox et d'une grille recevant des boules d'argile expansée. L'épaisseur du lit de boules permet de contrôler la perte de charge et de mettre en contact les résidus graisseux avec le bain de lavage, pouvant comporter des enzymes, sur une surface importante. 



  L'air purifié mais chargé de solution traverse le séparateur de gouttelettes 11 séparant la solution de l'air purifié. La solution est recueillie dans la partie inférieure du caisson 1 et évacuée par le conduit 12 pour être ramenée au réservoir 14. 



  Des vannes de vidange permettent d'évacuer la solution de nettoyage lorsqu'elle est saturée. Un dispositif d'amenée d'eau contrôlé par un flotteur maintient le niveau du liquide dans le réservoir 14. 



  Les principaux avantages d'une telle hotte sont les suivants: 



  1. Construction très simple et facile à réaliser. 



  2. Condensation des vapeurs à l'aide d'un brouillard d'eau contenant une solution d'enzymes rendant les graisses hydrosolubles et détruisant celles-ci. 



  3. Ce même brouillard de solution de nettoyage provoque le nettoyage en continu du filtre à billes d'argile. 



  4. Le filtre à billes d'argile expansée augmente grandement la surface de contact entre l'air gras et le produit chargé d'enzymes. 



  5. Le filtre à billes d'argile permet d'interrompre le passage d'une flamme éventuelle évitant des feux de cheminée. Il permet, en variant l'épaisseur du lit de billes d'argile, de régler la perte de charge. 



  6. L'épuration des vapeurs et le nettoyage du filtre se font en continu et simultanément.



  



  The present invention relates to a kitchen hood which allows grease to be retained and whose filters are self-cleaning, that is to say which can be cleaned in the service position and during the operation of the hood.



  Patent holder CH 683 597 discloses a hood provided with a device for cleaning its filter grid. This cleaning device is complex and expensive, since it comprises a mobile spraying cart for the filter grid.



  The object of the present invention is the production of a self-cleaning hood of simple manufacture, without moving elements and of enhanced efficiency.



  The self-cleaning hood according to the present invention makes it possible to obtain the aim aimed at using the characteristics listed in claim 1.



  The drawing illustrates schematically and by way of example an embodiment of the self-cleaning kitchen hood according to the invention.
 
   Fig. 1 is a front elevation partially in section of the hood.
   Fig. 2 is a side elevation partially in section of the hood.
 



  The hood illustrated in fig. 1 comprises a box 1 open at its lower part inside which an upper guide 2 and a lower guide 3 are fixed.



  The two guides 2 and 3 define a passage 4 through which the vapors and fumes from a stove 5 located under the hood are sucked.



  This passage 4 opens into a chamber, also delimited by the box 1 and the guides 2 and 3, divided into two parts 6, 7 by a vertical wall 8, these two parts 6, 7 communicating with one another by their upper ends.



  The second part 7 of the chamber 6, 7 comprises a filter 9 with porous balls, for example expanded clay balls, a spray device 10 for this filter located in the upper portion of the part 7 of the chamber 6, 7, a droplet separator 11, inclined, placed under the filter 9.



  The lower portion of the part 7 of the chamber 6, 7 comprises a gravity discharge 12 of the cleaning solution of the filter 9 and a lateral discharge 13 of the purified air opening into a lateral discharge channel.



  The evacuation of the cleaning solution 12 brings this solution back into a tank 14. A pump 15 feeds the spraying device 10 from the solution contained in this tank 14.



  This hood is of particularly simple manufacture and design and it allows condensation of the vapors and cleaning of the ball filter continuously during the operation of the hood.



  In operation, the air and the cooking steam drawn in through the passage are conveyed by the part 6 of the chamber 6, 7 above the ball filter 9. The dispersing device 10 serves to condense the steam and simultaneously supply the filter cleaning solution, an enzyme solution that makes the fats water-soluble. The air passes through the upper portion of the part 7 of the chamber 6, 7 where it is brought into contact with the cleaning solution.



  Filter 9 is composed of a stainless steel frame and a grid receiving balls of expanded clay. The thickness of the bed of balls makes it possible to control the pressure drop and to put the fatty residues in contact with the washing bath, which may contain enzymes, over a large surface.



  The purified but solution-laden air passes through the droplet separator 11 separating the solution from the purified air. The solution is collected in the lower part of the box 1 and evacuated through the conduit 12 to be brought back to the reservoir 14.



  Drain valves allow the cleaning solution to drain when it is saturated. A water supply device controlled by a float maintains the level of the liquid in the reservoir 14.



  The main advantages of such a hood are:



  1. Very simple and easy to construct.



  2. Condensation of the vapors using a water mist containing a solution of enzymes making the fats water-soluble and destroying them.



  3. This same mist of cleaning solution causes continuous cleaning of the clay ball filter.



  4. The expanded clay ball filter greatly increases the contact surface between the fatty air and the product loaded with enzymes.



  5. The clay ball filter makes it possible to interrupt the passage of a possible flame avoiding chimney fires. It allows, by varying the thickness of the bed of clay beads, to adjust the pressure drop.



  6. The vapor cleaning and the filter cleaning are done continuously and simultaneously.

Claims

1. Self-cleaning kitchen hood characterized in that it comprises a box open downwards, an upper guide and a lower guide fixed on this box and defining between them a passage and a chamber in which air is sucked through of said passage; by the fact that said chamber is divided into two parts by a vertical wall, these two parts being in communication by their upper ends; by the fact that in the second part of the chamber are arranged from top to bottom: a spray device, a clay ball filter and a droplet separator; by the fact that the lower portion of this second part of the chamber comprises a lateral discharge of purified air and a gravity discharge of a cleaning solution;

and by the fact that the hood also comprises a tank of cleaning solution in which the solution of the chamber is discharged, tank supplying, with the aid of a pump, the spraying device.

2. Hood according to claim 1, characterized in that the clay ball filter allows, by varying its thickness, to control the pressure drop of the hood.

3. Hood according to claim 1 or 2, characterized in that the cleaning solution contains enzymes making the fats water-soluble.

4. Hood according to one of the preceding claims, characterized in that the clay ball filter constitutes a fire stop preventing any passage of flame.