WO1991004698A1

WO1991004698A1 - Device for a food cooking apparatus and cooking apparatus provided with such a device

Info

Publication number: WO1991004698A1
Application number: PCT/BE1990/000053
Authority: WO
Inventors: Lodewijk Jozef Theofiel Boyen
Original assignee: Nova Electro International N.V.
Priority date: 1989-10-02
Filing date: 1990-10-02
Publication date: 1991-04-18
Also published as: BE1003458A5; EP0494882A1

Abstract

A device for at least partially condensing steam and/or cooling smoke or steam rising from a vat (2) of a food cooking apparatus with a lid (3). The device comprises a chamber (8) for containing at least one liquid, a first pipe (10) linking an upper part of the vat (2) of the cooking apparatus and a lower part of the chamber (8), and a means (13) for sucking in smoke or steam to be cooled and/or condensed, for circulating said smoke or steam at least partially upwards in a liquid bath (9) contained in said chamber (8), and for expelling the smoke or steam through a second pipe (14) after its passage in said bath, the second pipe being provided for linking an upper part of the chamber (8) and an upper part of the vat (2) of the cooking apparatus.

Description

DEVICE FOR A FOOD COOKING APPARATUS AND COOKING APPARATUS PROVIDED WITH SUCH A DEVICE

SUMMARY OF THE INVENTION

The present invention relates to a device for at least partially condensing vapors and / or for cooling fumes or vapors coming from a tank of a food cooking appliance provided with a cover, this device comprising a chamber intended to contain at least one liquid, a first conduit intended to connect an upper part of the tank of the cooking appliance to a lower part of the chamber, and a means allowing a suction of the fumes or vapors to be cooled and / or condensed , their at least partially ascending circulation in a bath of liquid contained in said chamber and the discharge of fumes or vapors after their passage in said bath in a second conduit, in which the second conduit is intended to connect an upper part of the chamber to an upper part of the cooking appliance tank.

The present invention also relates to a food cooking appliance comprising a tank intended to contain food to be cooked in a liquid, a cover intended to cover at least partially the tank, and a device of the type described above. THE STATE OF THE ART

Devices are known for condensing vapors from a cooking appliance by the documents FR-A-684509, DE-A-634984, EP-A-0 095797 and NL-A-84 00328.

The known devices include a chamber containing a liquid or another refrigerant and a conduit connecting a cooking vessel to said devices.

In known devices, said conduit extends into the chamber so that the coolant in contact with this conduit allows condensation of vapors in the latter.

In other devices of the known type, the vapors are brought into contact with one face of a cooling liquid.

All these known devices do not allow cooling and / or effectively condensing the vapors or fumes produced or effectively washing or filtering said vapors or fumes. Thus, with these known devices, the vapors are only very partially condensed and their outlet temperature still remains substantially too high compared to the maximum allowed temperatures of the gases or vapors for efficient operation of filters such as activated carbon filters. Document DE-A-1 679 119 also discloses a grilling appliance comprising:

a roasting oven, through a first end of which fresh air is introduced by a fan;

chambers for washing or filtering the fumes leaving a second end of the oven, these chambers mounted in series containing a liquid or solid substance such as activated carbon, and

- a blower intended to draw air or fumes from said chambers.

In this roasting appliance, the oven is subjected to a stream of fresh air intended to expel the fumes or vapors produced in the oven.

To move the fumes or vapors by means of a fresh air stream, it is necessary to guarantee a good seal of the oven to prevent the air entering the oven and the fumes from being evacuated through orifices or other openings. that the oven would have and are not brought to the washing or filtration chambers. The oven is overpressure relative to atmospheric pressure, as indicated in said document.

In this oven, the fumes or vapors treated or washed are not recycled in the oven. Indeed, the art ^has always banned the recycling of fumes or vapors in a cooking vat not alter the qualities of the grilled food. For example, a person skilled in the art knows that in order to obtain crispy fries, it is necessary to evacuate the vapors from the cooking vessel and that, if too many vapors remain in the cooking vessel, only soft fries and sticky can be obtained.

Those skilled in the art also know that during the second cooking of the fries or the cooking of frozen food in an oil bath, a significant release of steam takes place over a very short period of time. Therefore, even if a person skilled in the art could have expected a good vapor condensation yield by virtue of a system of bubbling them into a liquid, it was obvious to a person skilled in the art that, when said significant release of vapors, a non-negligible quantity of vapors may not be condensed and that, therefore, its recycling could alter the qualities of the cooked products.

None of the known devices allows effective treatment of the vapors produced during the second cooking of the fries or the cooking of frozen foods, that is to say an almost total condensation of these vapors.

BRIEF DESCRIPTION OF THE INVENTION

The subject of the present invention is a device for at least partially condensing vapors and / or for cooling fumes or vapors originating from a tank of a food cooking appliance. fitted with a cover. This device comprises a chamber intended to contain at least one liquid, a first conduit intended to connect an upper part of the tank of the cooking appliance to a lower part of the chamber, and a means allowing a suction of fumes or vapors to to cool and / or to condense, their at least partially ascending circulation in a liquid bath -contained in said chamber and the discharge of fumes or vapors in a second conduit after their passage in said bath, said second conduit being intended to connect a part upper part of the chamber to an upper part of the cooking appliance tank.

Preferably, the means allowing the suction of fumes or vapors to cool and / or condense is mounted in the second conduit and allows the fumes and / or vapors to bubble through the liquid contained in the chamber.

In one embodiment of the device according to the invention, it comprises a cover intended to cover at least partially the tank of the cooking appliance, said second conduit opening into at least part of the cover or a part integral with said cover, this part communicating at least with an upper part of the tank of the cooking appliance when said cover at least partially covers said tank.

According to a detail of a device according to the invention, it comprises: - a lid ;

- a chamber containing a liquid;

- A support relative to which said cover is movable, this support having an orifice intended to allow the passage of vapors produced in a tank of the cooking appliance in a duct having an opening adjacent to the lower part of said chamber;

a part extending said duct, this part comprising a plate having a series of openings intended to distribute the flow of vapors in the liquid;

means intended to create a depression in the part of the chamber situated above the liquid with respect to the pressure of the vapors in said duct, and

a conduit connecting said means to the cover or to the support so as to bring the gases located in the part of the chamber located above the liquid into the tank.

Other features and details of the device according to the invention will emerge from the following detailed description in which reference is made to the accompanying drawings. DESCRIPTION OF THE DRAWINGS

In these drawings:

- Figure 1 schematically shows an embodiment of a device according to the invention;

FIG. 2 shows in perspective and partially in section an embodiment of a device according to the invention,

FIG. 3 shows in section a detailed view of the device shown in FIG. 2, and

- Figure 4 is a perspective view with partial cutaway of another embodiment of a device according to the invention.

DESCRIPTION OF EMBODIMENTS OF THE INVENTION

Figure 1 shows a cooking appliance 1 comprising a tank 2 and a cover 3 provided with a manhole

4. The basket 6 of the cooking appliance is shown in broken lines. When cooking vapors and fumes V are produced in the tank 2.

The device 7 according to the invention comprises:

- A chamber or reservoir 8 intended to contain a liquid 9 such as water; a conduit 10, intended to connect an upper part 12 of the tank 2 to the chamber 8, and

a means 13 allowing an upward circulation of the vapors (V) in a bath of liquid 9 contained in said chamber 8.

Preferably, the means 13 such as a blower or a fan allows said vapors to bubble through the bath. This blower 13 creates a pressure difference between the duct 10 and the part of the chamber 8 located above the liquid.

In fact, this means or fan creates a vacuum in the chamber 8 relative to the conduit 10.

This vacuum allows the vapors V produced in the tank 2 to be sucked out of the tank 2 through the conduit

10 and splash in the liquid 9.

On the other hand, the fan 13 sucks in a gas

G located in chamber 8 and discharges this gas G through a conduit 14 in the upper part 12 of the tank 2. The device according to the invention thus makes it possible to recycle non-condensed vapors located in the room 8 in the tank 2, by example during the significant release of vapors occurring at the start of the second cooking of fries.

Figure 2 shows in perspective an embodiment of a device according to the invention mounted on a food cooking appliance.

The device 7 includes: - a cover 3;

a chamber 8 containing a liquid 9;

- A support 15 with respect to which said cover 3 is movable, this support having an orifice 16 intended to allow the passage of the vapors produced in a tank 2 of the cooking appliance in a duct 10, this duct 10 having an adjacent opening 17 to a lower part of the chamber 8;

a part 18 extending said conduit 10, this part comprising a plate 19 having a series of circular openings 20 intended to allow the bubbling of the vapors V in the liquid;

a means or fan 13 intended to create a vacuum in the part of the chamber 8 situated above the liquid with respect to the pressure of the vapors in the duct 10, and

a duct 14 connecting the fan 13 via the support 15 and the cover 3 to the tank 2 of the cooking appliance so as to bring gases located in the chamber 8 into the tank 2.

This device 7 comprises an assembly 21 which can be removed from the device 7. This assembly consists of an envelope 22 intended to form the chamber 8, this envelope having a first opening 23 intended to put the chamber 8 in communication with the means 13, a second opening 24 intended to allow the passage of vapors in a part of the conduit 10 extended by the part 18 and a third opening 25 intended to bring the chamber 8 into communication with a tank 26 located below the fan 13, this tank being intended to collect droplets of condensed vapors carried by the fan 13. (See in particular Figure 3).

The cover 3 is provided with a sight 4 making it possible to control the degree of cooking of the food without having to open the cover.

This manhole 4 has an upstream edge 27 and a downstream edge 28 opposite one another. A gas inlet port 29 for the chamber 8 is provided in the vicinity of the upstream edge 27, the latter preferably being provided with a deflector intended to direct said gas against the interior face of the manhole 4.

Evacuation orifices 32 in the form of slots are provided in the interior wall 30 of the cover 3 so as to bring said gas as well as cooking vapors into an interior space 31 of the cover 3 communicating with the conduit 10.

Preferably, a slot 32 is provided in the vicinity of the downstream edge 28 of the sight 4.

The space 31 extends between an external wall

33 of the cover and the internal wall 30 thereof. In alternative embodiments not shown, the duct 14 can be extended either by a discharge channel of at least a portion of the gases which are discharged therein, this channel then possibly being provided with a filter, or by a channel d supply of fresh air, the fresh air entering for example into the supply channel by a suction effect due to the speed of the gases in the duct 14.

In another embodiment, the chamber 8 or more exactly the liquid bath 9 contains packing elements such as rings, sleeves, saddles, etc. These elements allow,

on the one hand, to increase the bubbling of the vapors in the bath (that is to say to increase the condensation and / or the washing of the vapors) and

on the other hand to increase the average c (specific heat) of the bath.

The liquid bath may also contain means intended to absorb calories. One such means is for example salts (NaCl) or plates containing salts. According to a variant, the chamber contains a buffer means forming a reserve of liquid intended to absorb calories. Such a buffer means is for example a porous mass or sponge in which the liquid can infiltrate for example by capillarity. The operation of the cooking appliance provided with the device according to the invention shown in FIG. 2 is described below:

The oil-containing fryer was turned on and chamber 8 was filled with water.

An openwork basket containing fries was placed in the tank 2 of the fryer, this basket advantageously being provided with a handle of the type described in patent application EP-A-0008838.

The cover 3 was closed so that it covers the tank 2. When this cover rested on the upper edges of the tank 2, a switch enabled the operation of the fan.

13.

The latter then created a depression in the chamber 8 relative to the conduit 10 and to the tank 2.

The basket 6 was then lowered in the oil.

The fan 13 then allowed the cooking vapors to pass through the slots 32 in the space 31 of the cover and to be brought, by means of the conduit 10 provided with the plate 19, to bubble in the liquid (water) 9. This liquid could possibly contain salts or other additives. The gases located above the liquid 9 which may still contain some uncondensed vapors were sucked in by the fan 13 and discharged by the latter into the duct 14 extending into the cover 3.

These gases were thus brought, by means of a deflector placed in the vicinity of the outlet orifice 29 of the duct 14, to lick a wall of the manhole 4.

Putting the chamber 8 in vacuum and thus creating a suction of cooking vapors made it possible to avoid sealing problems, that is to say the passage of cooking vapors between the cover 3 and the tank 2 , such a passage of vapors presenting dangers for the user (risk of burns).

When the cooking was finished, the basket was raised and the cover 3 was opened. The opening of this cover caused the fan 13 to stop by a switch.

The fan 13 is preferably placed so as to draw in gases located in the chamber 8. In fact, the fan then draws in a cooled gas, which makes it possible to obtain a greater mass flow rate and to avoid problems of degradation of the fan fins.

The cooking appliance shown in the figure

2 also makes it possible to reduce or even avoid the transfer of heat in a kitchen or any other room where the appliance is used. FIG. 3 represents, on a larger scale, the details of the cooking appliance represented in FIG. 2. In particular, FIG. 3 shows details of the chamber 8.

The device 7 comprises an assembly 21 which can be removed from said device. This assembly consists of an envelope 22 intended to form the chamber 8.

This envelope 22 is advantageously provided with a handle 33 to facilitate its removal or its placement in said device.

A part 34 of the envelope 22 is supported on an edge 35 integral with another part 36 of the envelope 22. The part 34 can thus be moved relative to the part 36 so as to facilitate the filling or filling operations. washing of the chamber 8.

The conduit 10 extended by the part 18 is fixed on a neck 37 mounted on the part 34 of the envelope around the opening 24.

The part 36 of the envelope has two openings 23, 25 provided with valves 38, 39 intended to close said openings 23, 25 when the assembly 21 is removed from the device 7. The valve 38 intended to close the opening 25 is a leaf spring, one end of which is fixed to the casing 22. The displacement of part of the blade 38 to create an opening 25 in the casing is caused by the engagement of a conduit 41 secured to the tank 26 in said opening 25, the free end of this conduit 41 then abutting on said blade 38.

The valve 39 is mounted on a rod 42 capable of sliding along a sleeve 43 secured to the casing 22 by means of an intermediate piece 44 in a star shape. This intermediate piece 44 extends between a neck 45 surrounding the opening 23 and secured to the envelope and said sleeve 43. The valve and the rod 42 are subjected to the action of a return spring 46 whose force F is directed towards the outside of chamber 8.

The suction channel 47 of the fan 13 is provided with a grid 48. When the assembly 21 is placed in the device 7, the rod 42 abuts against the grid 48 so that the valve 39 moves at

The spring return force 46.

It goes without saying that the assembly 21 can be provided with security systems such as for example a switch preventing the rotation of the fan when the assembly 21 is not placed in the device 7 or when the chamber 8 does not contain no water or when the temperature of the gases leaving chamber 8 is too high. In a particular embodiment of the device 7 shown in FIG. 3, the valve 38 is a valve that opens or closes depending on the pressure prevailing in the container 26. In this embodiment, the container 26 has a inclined wall 49 (broken lines) intended to reduce the passage opening existing between the fan 13 and the tank 26. The envelope 22 is also provided with an internal wall 50 intended to form a room 51 (shown in broken lines) , this room forming a system of vessels communicating with room 8.

The pressurization of the tank 26 relative to the chamber 8 allows on the one hand the opening of the valve 38 and on the other hand at the level of liquid in the room 51 to descend.

The use of such a device makes it possible to increase the level of liquid in the chamber 8.

The pressurization of the tank 26 can for example be carried out by a pipe connecting the pipe 14 and the tank 26.

Figure 4 shows in perspective another embodiment of a device according to the invention.

This device includes:

- a cover 3 intended to cover a cooking tank 2; a support 15 relative to which the cover 3 is movable;

a chamber 8 containing a liquid 9, and

a means 13 intended to create a depression in the part of the chamber 8 situated above the liquid.

In fact, the means 13 sucks, via a conduit 50, gases located in the chamber 8 above the liquid 9 and discharges these gases into a conduit 14 and into a chamber 51 adjacent to the support 15 before discharging them into a part 52 of the cover 3 communicating with the cooking vessel 2 through slots 53.

The means or fan 13 by sucking through the conduit 50 of the gases located in the chamber 8 creates in this chamber a depression and therefore creates a suction of cooking fumes or vapors by a chamber 31 of the cover communicating with the cooking vessel 2 by slots 32 and by an intermediate chamber 54 situated between chamber 31 of the cover and chamber 8. This intermediate chamber 54 communicates through an opening 55 with an anti-chamber 77 in chamber 8, this anti-chamber extending by a duct 10 provided at its end with a plate 19 having a series of openings 20, the latter allowing efficient bubbling of the vapors in the liquid 9.

In fact, the tank 2 carries the means 13 and the support 15. integral with the chambers 51, 54. The upper face of the support 15 has four openings, at namely two openings 56, 57 intended to put the cover 3 in communication with the chambers 51, 54 and two openings 55, 58 to put in communication the chamber 8 with the chamber 54 and the fan 13.

The chamber 8 consists of an assembly which can be removed from the support 15 and the upper part 59 of which is removable to allow the chamber 8 to be filled with water or the said chamber 8 to be emptied.

The cover 3 which is provided with a window or manhole 4 can also be removed from the support 15. To allow, on the one hand, a pivoting of the cover relative to the support 15 and, on the other hand, the suction of fumes or vapors and the gas discharge, the cover has two protrusions 60, 61 between which extends a hollow shaft 62. The protrusions have an inner channel 63, 64 intended to connect a chamber 31, 52 of the cover 3 with a portion of the hollow shaft 62. On said shaft 62 are mounted two pipes 65, 66, while a wall 67 placed in the hollow of the tree 62 divides the latter into two parts, a first 68 communicating with the pipe 65 while the second communicates with line 66.

In summary, the circuit of vapors, fumes or gases is as follows for the device represented in FIG. 4:

Thanks to the fan 13 creating a vacuum in the chamber 8 by suction of gas G through the conduit 50, fumes or vapors V produced during the cooking in the tank 2 pass through the slots 32 in the chamber 31 of the cover and are brought by the channel 63 of the protuberance 60, by the part 68 of the hollow shaft and by the conduit 65 in the chamber 54 secured to the support 15 Then the fumes or vapors pass through the opening 55 and are introduced into the anteroom 67 before being brought through the conduit 10 to bubble through the liquid 9.

After bubbling, fumes or vapors as well as gases are sucked in by the fan 13. The latter 13 discharges them into the duct 14 and finally into the tank 2 via the slots 53 of the chamber 52 of the cover 3, the channel 64 of the protuberance 61, the part 67 of the hollow shaft 62 and the pipe 66.

When the conduits 66, 67 are secured to the support 15, for example when the said conduits are partially engaged in the openings 56, 57 of the support 15, the pivoting of the cover 3 relative to said support 15 and therefore relative to the tank is obtained thanks to the rotation of the cover 3 relative to the shaft 62.

Preferably at least a good seal is ensured in the vicinity of the opening 58 between the duct 50 and the chamber 8 so as to allow the fan to create a significant depression in the chamber 8.

The fan 13 is also provided with a safety device allowing the shutdown thereof when the water level in the chamber 8 is too large and when the cover does not cover the tank. This safety device is for example a pressure sensor to determine a minimum pressure in the suction duct 50, a contactor mounted in an electric circuit supplying the fan with current, this contactor controlled by the cover 3 and placed above the tank 2 being closed (no current flow) when the cover 3 does not cover the tank 2.

Another safety device would consist in using a hollow shaft 62 integral with the protuberances 60, 61 and on which are mounted two rings each having an opening communicating with a conduit 65, 66. The hollow shaft then also has two openings, so that the passage of vapors, fumes or gases is only possible when the openings of the hollow shaft are opposite those of the rings. This device therefore includes a system similar to the rotary valve.

Tests were carried out using cooking appliances fitted with a device according to the invention shown in FIG. 4.

In these tests, 500 g of potatoes (fries) were cooked and the cooking vapors were bubbled in about 2 liters of water at 15 ° C. It was noticed during these tests that the volume of liquid (water ) present in the room increased. Thus, when cooking the fries at 190 ° C for 5 minutes using the fryer shown in Figure 4, the amount of liquid present in the chamber 8 increased by about 0.170 liters.

The fries after cooking weighed 340 g, so we can deduce that:

500g - 340g = steam produced - quantity of oil carried by the fries

170g = vapor recovered.

Finally, during these tests it was noted that the total weight of the fryer provided with a device according to the invention did not vary during the cooking of the 500 g of fries. In other words the weight of the fryer - device - baking fries was equal to the weight of the fryer - device - baking fries. This demonstrates an efficiency of approximately 100%, that is to say the condensation to approximately 100% of the vapors.

When the gas located above the water in the chamber was not recycled in the tank 2, only a yield of around 90% could be obtained:

steam produced - quantity of oil carried by the fries 160g

recovered steam 150g.

Finally during these tests, it appeared that cooking the food seemed to be easier. This seems to be due to the fact that the recirculation of the fumes or vapors allows better mixing of the fumes or vapors located above the cooking bath and a reduction in heat loss, the fumes or vapors recycled in the tank having a temperature above ambient temperature.

These tests also proved that this recirculation made it possible to effectively treat the large quantity of vapors released during the second cooking of the fries without altering their taste (crisp).

Since thanks to the device according to the invention, _ 100% of the steam produced during cooking of food in oil is recovered, the device makes it possible to avoid drawbacks such as odors, obtaining greasy walls. ... which could be obtained by using known fryers.

Claims

1. Device for at least partially condensing vapors and / or for cooling fumes or vapors coming from a tank of a food cooking appliance provided with a cover, this device comprising a chamber intended to contain at least a liquid, a first conduit (10) intended to connect an upper part of the tank of the cooking appliance to a lower part of the chamber, and means (13) allowing a suction of the fumes or vapors to be cooled and / or to be condensed, their at least partially ascending circulation in a bath of liquid (9) contained in said chamber (8) and the discharge of fumes or vapors after their passage through said bath (9) in a second duct (14), characterized in that the second conduit (14) is intended to connect an upper part of the chamber via said means to an upper part of the tank of the cooking appliance.

2. Device according to claim 1, characterized in that said means (13) mounted in the second conduit (14) allows the fumes and / or vapors to bubble in the liquid (9).

3. Device according to claim 1 or 2, characterized in that it comprises a cover (3) intended to cover at least partially the tank (2) of the cooking appliance, the conduit (14) opening into at least one part of the cover (3) or a part integral with said cover, this part communicating at least with an upper part of the tank the cooking appliance when said cover (3) covers at least partially said tank (2).

4. Device according to any one of the preceding claims, characterized in that the

> chamber (8) is provided with a plate (19) having a series of openings (20) so as to distribute the flow of vapors in the liquid (9).

5. Device according to claim 1 or 2, 10 characterized in that it comprises:

- a cover (3);

- a chamber (8) containing a liquid (9); 15

- a support (15) relative to which said cover (3) is movable, the cover or support having an orifice (16) intended to allow the passage of the vapors produced in a tank (2)

20 of the cooking appliance in a first duct (10) having an opening (17) adjacent to a lower part of the chamber (8);

- A part (18) extending said conduit (10) in the vicinity of its opening (17), this part (18) comprising a plate (19) having a series of openings (20) intended to distribute the flow of vapors or fumes in the liquid of the chamber (8);

A means (13) intended to create a depression in the part of the chamber (8) situated above the liquid (9) with respect to the pressure of the vapors or fumes in said first duct (10), and

- a conduit connecting said means (13) to the cover (3) or to the support (15) so as to bring the gases located in the part of the chamber (8) located above the liquid (9) into the tank ( 2).

6. Device according to claim 5, characterized in that said means (13) is a fan or a turbine sucking gases from the chamber (8) and discharging them into the conduit (14).

7. Device according to claim 5, characterized in that it comprises an assembly (21) which can be removed from said device, this assembly consisting of an envelope (22) forming the chamber (8), this envelope (22) having a first opening (23) intended to put the chamber (8) in communication with the means (13) and a second opening (24) intended to allow the passage of fumes or vapors in a part of the duct (10) extended by said part (18).

8. Device according to claim 7, characterized in that the envelope (22) has a third opening (25) intended to put the chamber (8) into communication with a tank (26) located below said means (13) , this tank (26) being intended to collect droplets of condensed vapors possibly carried away by said means (13).

9. Device according to any one of claims 7 or 8, characterized in that the cover (3) is provided with a manhole (4) having an upstream edge (29) and a downstream edge (28) opposite to each other, and in that at least one gas inlet orifice from the chamber (8) in the tank (2) is provided in the vicinity of the upstream edge (29) of the manhole ( 4).

10. Device according to claim 9, characterized in that at least one discharge orifice

(32) of these gases is formed in the vicinity of the downstream edge (28) of this sight (4).

11. Device according to any one of the preceding claims, characterized in that the cover (3) consists of at least two walls (30, 33) distant from each other, so as to form a space (31 ), this space (31) communicating through an orifice with the conduit (10) and through openings (32) that one of said walls has with the tank (2) of the cooking appliance.

12. Device according to any one of the preceding claims, characterized in that it comprises means (5) for supplying fresh air into the cooking appliance, in the cover (3) or in the tank (2 ) of it.

13. Device according to any one of the preceding claims, characterized in that the liquid is water.

14. Device according to claim 1 or 2, characterized in that the chamber (8) has a room (51), this room forming with said room a system of communicating vessels, and in that said room (51) has an opening for the passage of a gas so that said room can be put under overpressure relative to the chamber (8).

15. Device according to claims 14, characterized in that the room (51) is connected to the conduit

(14) or to the fan (13) or to another duct extending between the fan (13) and the room (51).

16. Device according to claim 15, characterized in that said other conduit is a tank

(26) located below the fan (13).

17. Device according to any one of claims 3 and 5 to 10, characterized in that it is provided with a member stopping the operation of the means (13) of smoke extraction when the cover (3) no longer covers the tank (2).

18. Food cooking appliance comprising a tank (2) intended to contain food to be cooked in a liquid, a cover intended to cover at least partially the tank and a device (7) according to any one of the preceding claims.