EP3503675A1 - Hob and system for cooling the hob - Google Patents

Abstract

A hob comprises at least one heating element (3) extending in a heating plane (P), and a cooling system comprising air mixing means (9). The cooling system comprises: - a ventilation duct (15) extending from the stirring means (9) and opening into an outlet zone (16) located at said front edge (10a) of the hob (1) - air deflection means (17) located in said outlet area (16) of the ventilation duct (15), and being adapted to reverse the direction of the airflow; and- air evacuation openings (90b) disposed at the side edges (10c, 10d) of the hob (1), near a heating element (3).

Description

The present invention relates to a hob and in particular a cooling system of the hob.

Cooking appliances such as cooktops reach high temperatures when in use. Cooling systems are therefore necessary.

It should be noted that in the case of induction hobs, the cooling of the hob is necessary to obtain, inter alia, optimum performance.

The cooling systems are designed to drive the heat generated by the heating elements for cooking and the electronic components in the electronic boards managing the operation of the cooking appliances to the outside of the hob.

Cooking hobs are known having brewing means, such as a fan, located at the rear edge of the hob and air exhaust openings located at the front edge of the hob. The fan is located at the back of the cooktop to allow air from the crawl space, usually at the back of the cooktops.

The front edge of the cooktop is the side of the cooktop closest to a user facing it for use. Thus, the rear edge of the hob corresponds to its side farthest from the user. Side edges form with the front and rear edges around the cooktop.

The fan produces a flow of air that is directed to the exhaust openings at the front of the cooktop, with the airflow taking the heat produced by the cooker elements out of the cooktop. heaters and / or electronic components.

Nevertheless, in these hobs, the air is dispersed in the hob, and losses in the efficiency of cooling, including heating elements, exist.

The present invention aims to provide a hob with an improved cooling system.

For this purpose, the invention aims, in a first aspect, a hob with a cooking plane, at least one heating element extend in a heating plane located under said hob, and a cooling system comprising air stirring means arranged under said heating plane at a rear edge of said hob.

• un conduit de ventilation s'étendant à partir des moyens de brassage et débouchant dans une zone de sortie située au niveau d'un bord avant de la table de cuisson, ledit conduit d'évacuation comportant une extrémité d'entrée située au niveau des moyens de brassage d'air de sorte qu'un flux d'air provenant des moyens de brassage d'air entre dans ledit canal de ventilation à travers ladite extrémité d'entrée, et une extrémité de sortie situé au niveau de ladite zone de sortie,
• des moyens de déflexion d'air situés dans ladite zone de sortie, au regard de ladite extrémité de sortie dudit conduit de ventilation, et étant conçus pour inverser le sens du flux d'air ; et
• au moins une ouverture d'évacuation d'air disposées au niveau d'au moins un bord latéral de la table de cuisson, à proximité dudit au moins un élément de chauffe, ledit au moins un élément de chauffe étant placé entre ladite zone de sortie et ladite au moins une ouverture d'évacuation d'air.

According to the invention, the cooling system further comprises:

• a ventilation duct extending from the brewing means and opening into an outlet zone located at a front edge of the hob, said exhaust duct having an inlet end situated at the level of the means blowing air so that air flow from the air blowing means enters said ventilation duct through said inlet end, and an outlet end located at said exit zone,
• air deflection means located in said exit zone, facing said outlet end of said ventilation duct, and being designed to reverse the direction of the air flow; and
• at least one air outlet opening disposed at at least one side edge of the cooking hob, close to said at least one heating element, said at least one heating element being placed between said outlet area and said at least one air outlet opening.

Thus, the air flow in the ventilation duct exits the ventilation duct through the outlet end and arrives at the exit zone, undergoes a reversal of the direction of circulation thanks to the air deflection means and moves towards the exit zone. said at least one air outlet opening located at at least one side edge of the hob. The air flow therefore flows on said at least one heating element located between the exit zone of the ventilation duct and said at least one air discharge opening, taking away the heat generated by the heating element.

Next, the airflow exits the cooktop through said at least one air outlet opening at said at least one side edge of the cooktop.

Therefore, the airflow being directed on said at least one heating element, it effectively carries the heat produced by the heating element to the outside of the hob.

According to one characteristic, the hob comprises at least one evacuation cavity located at at least one lateral edge of said hob, close to said at least one heating element, said at least one heating element being placed between the exit zone and said at least one evacuation trough.

Thus, the air flow in the ventilation duct exits the ventilation duct through the outlet end and arrives at the exit zone, undergoes a reversal of the direction of circulation thanks to the air deflection means and moves towards the exit zone. said at least one evacuation trough located at at least one side edge of the hob. The air flow therefore flows on said at least one heating element located between the exit zone of the ventilation duct and said at least one evacuation trough and then leaves the hob through said at least one opening exhaust outlet located at said at least one side edge of the cooktop.

According to one characteristic, the hob comprises at least one evacuation trough located at each lateral edge of said hob, close to said at least one heating element, said at least one heating element being placed between the outlet zone and said at least one evacuation trough.

Thus, an evacuation trough is located on each side of the hob.

According to one characteristic, said at least one evacuation cavity is formed by support trays on which said heating elements are positioned.

According to one characteristic, the hob includes an electronic card for managing the operation of the hob situated beneath said heating plane, the exhaust duct being delimited by two side walls, by a first face of the electronic card and by a support piece on which are placed said electronic card and said stirring means.

Therefore, the flow of air in the exhaust duct takes the heat produced by the electronic components in the electronic board to the outlet area of the ventilation duct, then undergoes a reversal of the flow direction and towards the inductors. before passing through the evacuation troughs and the air evacuation openings.

Indeed, the ventilation duct prevents the flow of air from spreading on the hob.

According to one characteristic, the first face of the table corresponds to the face on which the electronic components are mounted.

Thus, the air flow circulates around the electronic components, the heat being carried away by the airflow effectively.

According to one characteristic, a heat exchanger is mounted on said first face of the electronic card, inside the ventilation duct.

According to one characteristic, the cooling system further comprises two substantially vertical outlet side walls situated in the outlet zone on either side of the ventilation duct and connecting the outlet end of the evacuation duct and the means of air deflection.

Thus, the flow of air opening to the exit zone does not spread laterally on either side of the ventilation duct when it reaches the exit zone and is directed towards the air deflection means . The air in the exit zone being thus limited by the outlet side walls, the support piece and the deflection means, it rises towards the first plane while changing the direction of circulation thanks to the air deflection means.

Note that in this text, the hob is described in a position equivalent to that in which it will be used. Other said, it is considered that the hob is placed so that the worktop is in a horizontal position. Thus, a horizontal positioning indicates a position parallel to the work plane. In the same way, a vertical positioning indicates a position perpendicular to the work plane.

Thus, the outlet walls of the ventilation system extend in a plane perpendicular to the work plane.

According to one characteristic, the outlet side walls deviate towards the front edge of the hob with respect to said transverse axis of the hob.

The air from the exhaust duct is spread over a larger area of the cooktop.

According to one feature, the outlet side walls are bevelled, with an upper side of the outlet side walls being straight and inclined so that the upper side of the outlet side walls at the outlet end of the vent duct is located in a plane below a plane in which are located the upper sides at the level of the deflection means.

Thus, a first portion of the air flow exiting the ventilation duct is directed under the heating elements and a second portion is directed on the heating elements.

According to one feature, the upper sides of the outlet side walls form respectively with a horizontal plane an angle Δ 'of value between 5 ° and 20 °.

According to one characteristic, the air deflection means comprise a first substantially vertical wall disposed facing the outlet end of the evacuation duct, the first wall comprising at least a first curved zone and forming a recess situated opposite the outlet end of the exhaust duct.

Thus, the air coming from the evacuation pipe arrives at the hollow formed in the wall of the air deflection means and changes direction.

According to another characteristic, the air deflection means further comprise a second wall extending between a bottom wall of the ventilation duct and the first wall in a plane inclined relative to the hob.

For example, the inclined plane forms an angle with the plane in which extends the wall of the bottom of the evacuation conduit of value between 15 ° and 45 °.

The inclination of the wall of the air deflection means contributes to directing the airflow to upper portions of the cooktop.

According to one characteristic, said at least one discharge opening is positioned so that the flow of air leaves the hob in an oblique direction with respect to a transverse axis of the hob.

According to one feature, said at least one discharge opening is a slot extending longitudinally along oblique axes with respect to a transverse axis of the hob and forming with said rear edge of the hob an angle of between 30.degree. ° and 60 °.

According to one characteristic, the hob has second air exhaust openings located between the rear edge and at least one side edge.

According to one characteristic, the second discharge openings are positioned so that the air flow out of the hob in an oblique direction relative to a said transverse axis of the hob.

According to one feature, the second discharge openings are slots extending longitudinally in at least one corner wall located between said rear edge and at least one side edge.

Other features and advantages of the invention will become apparent in the description below.

• la figure 1 illustre en perspective une table de cuisson avec la plaque de cuisson ôtée selon un mode de réalisation de l'invention ;
• la figure 2 illustre en perspective la table de cuisson de la figure 1 avec une vue en coupe de certains éléments ;
• la figure 3 illustre en perspective la table de cuisson de la figure 1 de dessous ;
• la figure 4 illustre une vue en coupe de la table de cuisson de la figure 1
• la figure 5 représente des flux d'air dans la table de cuisson de la figure 1; et
• la figure 6 représente en perspective un détail d'une table de cuisson selon un second mode de réalisation.

In the accompanying drawings, given as non-limiting examples:

• the figure 1 illustrates in perspective a hob with the hob removed according to one embodiment of the invention;
• the figure 2 illustrates in perspective the hob of the figure 1 with a sectional view of certain elements;
• the figure 3 illustrates in perspective the hob of the figure 1 from below;
• the figure 4 illustrates a sectional view of the cooktop of the figure 1
• the figure 5 represents air flows in the cooktop of the figure 1 ; and
• the figure 6 represents in perspective a detail of a hob according to a second embodiment.

The figure 1 illustrates a hob 1 according to one embodiment of the invention.

In this embodiment, the hob 1 comprises four cooking hobs 2 extending in a cooking plane Pc. The cooking heaters 2 are constituted here by induction heating means.

In this embodiment, the heating means of each cooking zone 2 comprise an induction heating element or inductor 3.

In other embodiments, the heating means of each cooking chamber may comprise a plurality of induction heating elements or inductors placed concentrically or side by side.

On the other hand, in other embodiments, the number of cooking stoves may be different.

Thus, in the hob described, four heating elements extend under a hob formed in a known manner by a glass-ceramic hob (not shown in FIG. figure 1 ). The heating elements or inductors 3 extend in a heating plane P located under the hob Pc.

In this document reference is made to heating elements as inductors, although as indicated above, in other embodiments, the heating elements may be of other types.

The hob 1 has a front edge 10a, a rear edge 10b and two side edges 10c, 10d surrounding the hob Pc and therefore forming the perimeter of the hob 1.

The front edge 10a of the hob 1 corresponds to the free edge of the hob or edge that is closest to a user using the hob 1. The rear edge 10b corresponds to the edge opposite the front edge 10a, thus being the edge furthest away from the user. The lateral edges 10c, 10d are the edges placed between the ends of the rear edge 10b and the ends of the front edge 10a respectively.

In order to simplify the description of the hob 1 according to the invention, it is considered that the hob 1 is placed on a horizontal plane, such as a worktop. Thus, some elements are on or under other elements. In addition, landmarks in horizontal and vertical directions are employed.

Of course, the marks on the positioning of the elements vary if the hob is placed differently but can be interpreted by a skilled person in the presence of this document.

In addition, a transverse center axis A1 of the hob 1 is defined as an axis parallel to the side edges 10c, 10d and perpendicular to the front and rear edges 10a, 10b, equidistant from the side edges 10c, 10d.

The inductors 3 are placed on supporting elements or support plates 4. The support plates 4 are intended to maintain the inductors 3 in a fixed position, so as to guarantee a constant and invariable air gap and to obtain optimum operation of the table. Cooking.

The air gap is defined as the vertical distance between an inductor and the bottom of a cooking vessel placed on the hob.

The support plates 4 are further intended to protect the electronic components of the hob from electromagnetic waves produced by the inductors when they are in operation.

The support plates 4 are made of a metallic material in order to ensure good dissipation of the heat produced by the inductors 3.

In the embodiment described, a front support plate 4a receives two inductors 3 located at the front of the hob 1 and a rear support plate 4b receives two inductors 3 located at the rear of the cooktop 1.

Of course, in other embodiments, a single support plate can support all the inductors or each support plate can support one inductor at a time. In addition, the arrangement of the support plates may be different.

The hob 1 comprises control means 5 of the cooking hobs 2. The control means 5 are located here at the front edge 10a of the hob 1.

In addition, the hob 1 comprises at least one electronic card 6 (visible on the figure 2 ) having electronic circuits necessary for managing the operation of the cooktop 1.

On the electronic card 6 is mounted a heat exchanger 7. In this embodiment, the heat exchanger 7 is a heat exchanger or finned radiator.

The hob further comprises air mixing means 9 such as a fan (visible on the figure 3 ). The fan 9 is located at the rear edge 10b of the hob 1 to circulate air entering the hob 1.

Note that the fan 9 is placed near the rear edge 10b to be at the level of the crawlspace, to suck fresh air.

In one embodiment, the axis of rotation (not visible) of the fan 9 is disposed vertically or in a direction perpendicular to the cooking plane P.

The support plates 4 of the inductors 3, the control means 5, the electronic card 6 and the other conventional elements of the hob necessary for its operation are arranged on a housing 8.

The housing 8 of the hob is visible to figures 2 and 3 . The housing 8 is placed under the hob Pc and receives the various elements of the hob 1.

The housing 8 is formed of a bottom 80 and peripheral walls 8a, 8b, 8c, 8d located respectively at the front edges 10a, rear 10b and side 10c, 10d of the hob 1. Here, the housing 8 has a substantially rectangular shape.

In the embodiment described, the bottom of the housing 80 extends substantially in three planes P1, P2, P3 (visible at the figure 4 ) parallel to each other and parallel to the cooking plane Pc and the heating plane P.

In the embodiment described below, the housing 8 is made in one piece by stamping a metal sheet. The housing 8 could also be made of another material, for example plastic material.

In other embodiments, the housing may be formed by several parts assembled together.

A central portion 801 of the bottom of the casing 80 extends over a first plane or lower plane P1. In this embodiment, and as will be described later, the electronic card 6, the stirring means 7 and the control means 5 will be positioned on this central portion 801.

Side portions 802c, 802d of the bottom of the housing 80 are located at the side edges 10c, 10d of the hob 1 and extend on a second plane or upper plane P2. On the lateral parts 802c, 802d of the bottom of the housing 80 are positioned and attach the support plates 4 of the inductors 3.

The side portions 802c, 802d are in this embodiment symmetrical with each other with respect to the transverse central axis A1 of the hob 1.

Intermediate portions 803c, 803d of the bottom of the housing 80 are respectively placed between the central portion 801 and each side portion 802c, 802d. The intermediate portions 803c, 803d extend over a third plane or intermediate plane P3, located between the first and second planes P1, P2.

An upper space of the hob 1 is defined as the space between the cooking plate and the assembly formed by the second plane P2 and the heating plane P, an intermediate space as the space between the heating plane ( and the second plane P2) and the third plane or intermediate plane P3, and a lower space as the space between the third plane or intermediate plane P3 and the first plane P1.

The intermediate parts 803c, 803d are in this embodiment symmetrical with each other with respect to the transverse central axis A1 of the hob 1.

The central portions 801, the lateral portions 802c, 802d and the intermediate portions 803c, 803d respectively extend substantially on the above-mentioned planes P1, P2, P3 over substantially the entire space between the front edge 10a and the rear edge 10b. from the hob 1.

Ventilation openings 90 are formed at different positions of the casing 8.

An inlet ventilation opening 90a is placed in the central portion 801 of the bottom of the housing 80. The inlet ventilation opening 90a is placed opposite the stirring means or fan 9 and is designed to enter the air from the outside of the cooktop 1.

Thus, in the embodiment described, the inlet ventilation opening 90a has a circular shape.

In the embodiment illustrated in figures 2 and 3 the inlet ventilation opening 90a has a plurality of slots extending circumferentially in concentric rings.

Of course, the inlet ventilation opening 90a may have different sizes and shapes.

First air evacuation openings 90b are disposed at the side edges of the hob 1, on the side portions 802c, 802d of the bottom of the housing 80.

In one embodiment, a plurality of first air outlet openings 90b are distributed over the side portions 802c, 802d of the bottom of the housing 80.

In one embodiment, the first air evacuation openings 90b are positioned so that a flow of air leaves the hob 1 in a direction D1 oblique to the transverse center axis A1 of the cooktop 1.

Thus, in one embodiment, the first air outlet openings 90b are slots, each slot 90b extending longitudinally along an oblique axis A2 with respect to the transverse central axis A1 of the hob 1, the oblique axis A2 and the transverse central axis A1 forming an angle ε may have a value less than 90 °, and preferably between 30 ° and 60 °. When the angle ε is within this range of values, the position of the air evacuation openings 90b allows the evacuation of air towards the rear of the table on the lateral edges 10c, 10d, avoiding that the air so directly on the crawl space.

The hob 1 further includes second exhaust apertures 90c located at the rear corner regions 11a, 11b of the hob 1. A first corner area 11a is formed between the trailing edge 10b and a first side edge 10c and a second corner area 11b is formed by the trailing edge 10b and a second side edge 10d.

The second air outlet openings 90c open in an oblique direction D2 between the transverse center axis of the table A1 and a longitudinal median axis A3 perpendicular to the transverse central axis A1.

The second discharge openings 90c are formed in corner walls 12a, 12b beveled at the rear corner regions 11a, 11b of the cooktop 1 respectively. In addition, in this embodiment, the corner walls 12a, 12b extend along an inclined plane between the cooking plane Pc and the third plane or intermediate plane P3 in which the intermediate portions 803c, 803d of the bottom of the housing 80. The second discharge openings 90c are arranged between the hob Pc and the second plane or upper plane P2 in which the lateral portions 802c, 802d extend from the bottom of the housing 80.

By way of example, the corner walls 12a, 12b are inclined with respect to the vertical direction by an angle β between 30 ° and 45 °.

In this embodiment, the second air outlet openings 90c are longitudinal slots.

In this embodiment, the number of first evacuation openings 90b is twelve, six on each intermediate portion 803c, 803d of the bottom of the housing 80. The number of second evacuation openings 90c is six, three on each wall angle 12a, 12b of the housing 8.

Of course, the air outlet openings may have different shapes, such as circular openings. They can also be in number and of different size.

The intermediate portions 803c, 803d of the bottom of the housing 80 have a plurality of projections 13 extending along a vertical axis towards the cooking plane P. It will be noted that the axis along which the projections 13 extend is thus perpendicular to the intermediate parts 803c , 803d from the bottom of the housing 80.

The projections 13 of each intermediate portion 803c, 803d are placed substantially equidistant from each other and are, in this embodiment, four.

In this embodiment, the projections 13 have a conical shape with the rounded tip or a boss shape.

According to other embodiments, the projections may have a truncated cone shape, the truncated surface being circular. In addition, the projections may have a polygonal base or cylinder shape.

The height of the projections 13 with respect to the intermediate portion 803c, 803d of the bottom of the casing 80 is equivalent to the distance between the second plane P2 in which the lateral portions 802c, 802d extend and the third plane P3 in which extend the intermediate parts 803c, 803d of the bottom of the housing 80.

The support plates 4 of the inductors 3 are in contact with the projections 13 when they are positioned on the lateral parts of the housing 8. Thus, the projections 13 have a function of holding the support plates 4 of the inductors. The support plates 4 of the inductors thus rest on the projections 13 and the side portions 802c, 802d of the bottom of the housing 80 forming with the inductors 3 the heating plane P. Thus, the heating plane P and the second plane P2 are located side by side or can be confused in a single plane. It can thus be considered that the support plates 4 are located substantially in the second plane P2.

In addition, the projections 13 allow the formation of a free space between the heating plane (or the support plates 4 of the inductors 3) and the third plane P3 on which the intermediate portions 803c, 803d of the bottom of the housing extend. 80. This free space, called an intermediate space, serves, as will be described later, passage for the circulation of a flow of air from the inside of the hob 1 and which goes to the openings of exhaust 90b, 90c to exit the cooktop 1.

In the embodiment described, the hob 1 comprises a support part 14 intended to receive and hold components of the hob 1. For example, the fan 9, the electronic card 6 and the control means 5 are mounted on the support member 14. In particular, these elements are mounted on a bottom 140 of the support piece 14.

The support piece 14 is placed on the central portion 801 of the bottom of the housing 80, between the rear edge 10b and the front edge 10a of the hob 1.

In this embodiment, the fan 9 is placed in the support piece 14 at the rear edge 10b of the hob 1. In addition, the electronic card 6 is placed in the support piece 14, between the fan 9 and the front edge 10a of the hob 1.

In this embodiment, a first face 6a of the electronic card 6 is disposed facing the bottom wall 140 of the support member 14. On this first face 6a are placed the electronic components necessary for the operation of the hob. 1, as well as a heat exchanger 7 for increasing the cooling efficiency of the electronic components of the electronic card 6.

A second face 6b of the electronic card 6 is arranged opposite the support plates 4.

In this embodiment, the second face 6b of the electronic card 6 extends in the third plane or intermediate plane P3.

The hob 1 further comprises a cooling system for cooling the electronic components of the electronic card 6 and the heating elements 3.

The cooling system is described in particular with reference to the figures 4 and 5 .

The cooling system comprises the air mixing means or fans 9 arranged under the hob, at the rear edge 10b of the hob 1.

The cooling system further comprises a ventilation duct 15 positioned between the fan 9 and an outlet zone 16. The ventilation duct 15 has an inlet end 150 located at the fan 9 and an outlet end 151 located at the outlet. level of the exit zone 16.

The ventilation duct 15 extends along the transverse central axis A1 of the hob 1.

In this embodiment, the ventilation duct 15 is delimited by two lateral walls 152, 153, by the first face 6a of the electronic card 6 and the bottom wall 140 of the support piece 14.

Thus, the ventilation duct 15 runs along the electronic card 6.

In one embodiment, the side walls 152, 153 are formed in the support member 14 and are perpendicular to the bottom wall 140 of the support member 14.

The flow of air leaving the fan 9 is thus directed towards the outlet zone 16 through the ventilation duct 15.

Output deflection means 17 are located in the exit zone 16, facing said outlet end 151 of the ventilation duct 15. The outlet deflection means 17 are designed to reverse the direction of the outgoing air flow of the ventilation duct 15.

Two outlet side walls 160, 161 are located in the outlet zone 16 on either side of the ventilation duct 15 and connecting the outlet end 151 of the ventilation duct 15 and the outlet deflection means 17.

The outlet side walls 160, 161 extend in a vertical plane parallel to the transverse central axis A1 and perpendicular to the cooking plane P.

Thus, the flow of air leaving the evacuation duct 15 and opening into the exit zone 16 is led by the outlet side walls 160, 161 towards the outlet deflection means 17.

The outlet deflection means 17 comprise at least a first wall 170 comprising a first curved zone 171 forming a recess situated opposite the outlet end 151 of the ventilation duct 15. The first wall 170 extends in a plane substantially vertically parallel to the front edge 10a and perpendicular to the cooking plane P. Thus, the air flow leaving the ventilation duct 15 through the outlet end 151 reaches the first wall 170.

The curved zone 171 forms with the vertical direction an angle Δ of between 35 ° and 60 °.

When the air flow arrives at this curved zone it undergoes a reversal of direction and therefore goes to the rear edge 10b of the hob 1.

In the embodiment described, the deflection means 17 further comprise a second wall 172 extending in a plane inclined relative to said cooking plane or to the horizontal plane. This second wall 172 extends facing the outlet end 151 of the ventilation duct 15. The inclined plane is located opposite the outlet end 151 of the ventilation duct 15, and extends from the bottom wall 140 of the support member 14 to the front edge 10a of the hob 1. The first wall 170 is supported on the second wall 172 to form the deflection means 17.

Thus, the air arriving at the exit zone 16, guided by the outlet side walls 160, 161 towards the deflection means 17, arrive towards the second wall 172 in the inclined plane. This second inclined wall 172 causes the air flow to rise towards the first wall 170 comprising the curved zone 170.

In one embodiment, the inclined plane in which the second wall 172 extends deflection means 17 forms, with the plane in which having the bottom wall 140 of the support member 14, an angle γ of a value between 15 ° and 45 °.

In the embodiment described, the second wall 172 is formed by a wall of the casing 8, in extension of the casing base 80.

In another embodiment, illustrated by the figure 6 , the second wall 172 is formed by a wall of the support member 14, in extension of the bottom wall 140 beyond the ventilation duct 15.

In other embodiments, the second wall of the deflection means is a substantially vertical wall disposed opposite the second end of the ventilation duct.

In the embodiment described, the outlet side walls 160, 161 deviate towards the front edge 10a of the hob 1 with respect to said median transverse axis A1 of the hob 1.

Thus, the width of the first wall 170 forming deflection means 17 is greater than the width of the ventilation duct 15 at the outlet end 151.

Each outlet side wall 160, 161 forms with the transverse central axis A1 an angle 6θ having, by way of illustration, a value of between 5 ° and 20 ° ( figure 5 ).

Thus, the air flow is spreading on both sides of the ventilation duct 15.

In one embodiment, the exit sidewalls 160, 161 are bevelled, the upper side 160a, 161a of the exit walls 160, 161 being straight and inclined so that the upper side 160a, 161a of the exit sidewalls 160, 161 at the outlet end 151 of the ventilation duct 15 is located in a plane below a plane at which the upper sides 160a, 161a are located at the deflection means 17. The upper sides 160a, 161a form with the plane at which are located the upper sides 160a, 161a at the deflection means 17 an angle Δ 'with a horizontal plane of value between 5 ° and 20 °.

In one embodiment, the lower side 160b, 161b of the outlet side walls 160, 161 at the outlet end 151 of the vent duct 15 is located substantially in the third plane or intermediate plane P3 in which extend the intermediate portions 803c 803d of the housing bottom 80 so that the air flow can circulate in the intermediate space formed between the third plane P3 and the assembly formed by the heating plane P and second plane P2.

The figures 2 and 4 represent air flows circulating in the hob 1.

The heat produced by the electronic components of the electronic card 6 is expelled outside the hob 1, in particular by means of a first air flow F1.

The first air flow F1 corresponds to air entering the fan 9 through the inlet opening 90a, along the ventilation duct 15 to the outlet zone 16, changing direction when arriving at the means deflection 17, entering the space formed between the third plane P3 of the housing 8 and the support plates 4 of the inductors 3 (or between the third plane P3 and the heating plane P), and moving towards the first openings of exit 90b to exit the hob 1.

This first air flow F1 also carries heat released under the support plates 4 of the inductors 3, in particular under the front support plate 4a.

It will be noted that the second face 6b of the electronic card 6 prevents the flow of air F1 flowing in the intermediate space formed between the third plane P3 and the support plates 4 to descend towards the casing 8 once the flow returns to the the rear edge 10b after having left the ventilation duct 15. In other words, the electronic card 6 separates the intermediate space and the lower space of the hob 1.

In addition, in this intermediate space above, air flows out of the cooktop 1 through the second exhaust openings 90c.

It will be noted that the first air evacuation openings 90b are arranged at the side edges 10c, 10d of the hob 1, proximity of at least one heating element or inductor 3 and that said at least one heating element 3 is placed between the outlet zone 16 of the ventilation duct 15 and the first air evacuation openings 90b.

Thus, when the air flow leaving the ventilation duct 15 goes to the first air evacuation openings 90b, it circulates above and below the heating element 3.

The air from the ventilation duct 15 is further circulated between an upper space formed between the heating plane P and the cooking plate or hob Pc.

In this embodiment, two discharge recesses 21a, 21b are respectively arranged at the side edges 10c, 10d of the hob 1, allowing the evacuation of air in this upper space. Each evacuation trough 21a, 21b is located towards the middle of each lateral edge 10c, 10d of the hob 1.

In another embodiment, a single evacuation trough is provided on a side edge of the cooktop.

In other embodiments, a plurality of discharge recesses are provided on a side edge or on both side edges of the cooktop.

The evacuation troughs 21a, 21b are arranged so that the air flows circulating between the trays of the supports 4 of the inductors 3 and the cooking plane Pc enter the evacuation trough 21a, 21b and leave the cooking table. 1 through the first exit openings 90b.

In the embodiment described, the evacuation troughs 21a, 21b are located at each side edge 10c, 10d of said cooktop 1. Each trough 21a, 21b is located near at least one heating element 3, said at least one heating element 3 being placed between the outlet zone 16 and the evacuation cavity 21a, 21b.

In the embodiment described, the front and rear support plates 4a, 4b placed side by side form with the side edges 10c, 10d, the discharge recesses 21a, 21b respectively.

In this embodiment, the support plates 4a, 4b have a substantially rectangular shape. Each support plate 4a, 4b has two longitudinal sides 4aa, 4ab, 4ba, 4bb parallel to each other, and two transverse ribs 4ac, 4ad, 4bc, 4bd parallel to each other. The transverse ribs 4ac, 4ad, 4bc, 4bd are located respectively at the side edges 10c, 10d of the hob 1.

Each support plate 4a, 4b has between each transverse side 4ac, 4ad, 4bc, 4bd and each longitudinal side 4aa, 4ab, 4ba, 4bb, a beveled side 4ax, 4ay, 4bx, 4by.

In this embodiment, the discharge recesses 21a, 21b are formed between beveled sides 4ax, 4ay, 4bx, 4by of the front and rear support trays 4a, 4b and each side edge 10c, 10d of the cooktop 1.

Of course, the support plates and the evacuation troughs may have different shapes.

The front support plate 4a has a front opening 41 located on the outlet area 16 of the ventilation duct 15. Thus, the airflow coming from the ventilation duct 15 to the outlet area 16 and changing direction through the means deflection 17, enters the upper space formed between the support plates 4 of the inductors and the cooking plate (not visible).

Thus, a second air flow F2 corresponds to air entering the fan 9 through the inlet opening 90a, passing through the ventilation duct 15 to the outlet zone 16, changing direction as it arrives. the deflection means 17, entering the upper space formed between the front support plates 6a and the cooking plate (not visible), passing through the discharge recesses 21a, 21b and coming out of the cooking plate 1 through the first exit openings 90b.

It will be noted that air flows not entering the exhaust recesses 21a, 21b exit rearwards from the cooktop 1 through the second outlet openings 90c.

This second air flow F2 is intended to cool in particular the inductors 3 located at the front of the hob 1.

This embodiment is given for illustrative purposes. In another embodiment, it will be possible to have the first outlet openings 90b in a plane substantially identical to or greater than the heating plane P so as to overcome the evacuation troughs and that the second air flow F2 goes directly to the outlet openings 90b.

A second opening 42 or rear opening is arranged in the rear support plate 4b at the inlet end of the ventilation duct 15. The second opening 42 is therefore placed at the transverse center axis A1 of the table cooking 1.

In the embodiment shown, the rear opening 42 has a substantially rectangular shape, two sides of the opening 42 being parallel to the front 10a and rear 10b edges of the hob 1.

Under the rear opening 42, entry deflection means 18 (visible figure 4 and 5 ) are placed at the inlet of the ventilation duct 15, between the fan 9 and the inlet end 150 of the ventilation duct 15.

In one embodiment, the inlet deflection means 18 comprise two inlet side walls 181, 182 placed on either side of the ventilation duct 15. The inlet side walls 181, 182 extend in vertical planes perpendicular to the hob and to the front edges 10a and 10b of the hob and parallel to the side edges 10c, 10d of the hob 1. Each inlet side wall 181, 182 is placed between the fan 9 and the inlet end 150 of the ventilation duct 15.

The inlet deflection means 18 comprise a deflection piece 183 located between the two inlet side walls 181, 182 and fixed between them.

In one embodiment, the deflection piece 183 has a first wall 183a extending in a plane parallel to the cooking plane. This first wall 183a extends between the two input side walls 181, 182 along a curved line and forming a circular arc.

The deflection piece 183 has a second wall 183b projecting from the first wall 183a in a vertical direction and towards the cooking plane Pc.

In the embodiment described, the second wall 183b of the deflection piece 183 is therefore located between the two input side walls 181, 182 and fixed between them.

The second wall 183b of the deflection piece 183 forms a curved or oblique wall forming an arc of a circle, the hollow formed by this curved wall being arranged opposite the fan 9.

The inlet deflection means 18 may have other shapes designed to change the direction of flow of a stream of air arriving on them.

A second embodiment of the input deflection means 18 'is shown in FIG. figure 6 .

In this embodiment, the input deflection means 18 'comprise a deflection piece 183' having a V shape.

The deflection piece 183 'has two walls 183a1', 183a2 'extending between the two inlet side walls 181', 182 'in oblique directions at the inlet side walls 181', 182 'and between them, and converging in a vertex portion V. The crown portion V is substantially located on the transverse center axis A1 of the hob 1 and is the part of the deflection piece closest to the fan 9.

In this embodiment, the first walls 183a1 ', 183a2' of the deflection piece 183 are symmetrical with respect to the transverse central axis A1 of the hob 1. Thus, the flow of air from the fan 9 is evenly distributed between both sides of the cooktop 1.

Of course, the first walls of the deflection piece may not be symmetrical with respect to the transverse central axis A1 of the hob 1 so that the flow of air from the fan 9 is directed on both sides from the hob in different amounts.

In this embodiment, the deflection piece 183 comprises two second walls 183b1 ', 183b2' projecting respectively from the first walls 183b1 ', 183b1' in a vertical direction and towards the cooking plane Pc.

Similarly to the first walls 183a1 ', 183a2', the second walls 183b1 ', 183b2' extend between the two inlet side walls 181 ', 182' in oblique directions at the inlet side walls 181 ', 182'. and between them, and converge in the vertex V. Thus, in this embodiment, the second walls 183b1 ', 183b2' are symmetrical with respect to the transverse central axis A1 of the hob 1.

Thanks to the inlet deflection means 18, 18 ', a part of the air flow leaving the fan 9 and going towards the front edge 10a of the hob 1 through the ventilation duct 15, changes direction of circulation through the deflection member 183 of the inlet deflection means 18 and through the rear opening 42 to reach the space between the rear support plates 4b and the cooking plate (not visible).

The air arriving at this upper space of the hob 1, passes on the inductors 5 located on the rear support plate 4b to then exit the hob 1 through the second outlet openings 90c.

Thus, a third air flow F3 corresponds to air entering the fan 9 through the inlet opening 90a, arriving at the inlet deflection means 18, changing direction when arriving at the deflection piece 183, entering the upper space formed between the rear support plates 4b and the cooking plate (not visible), and leaving the cooktop 1 through the second outlet openings 90c.

This third air flow F3 expels from the hob 1 of the heat produced in particular by the inductors 3 located at the rear of the hob 1.

Thus, the cooling of the inductors 3 located at the rear of the hob 1 is improved.

Claims (15)

Cooking hob comprising a hob (Pc), at least one heating element (3) extending in a heating plane (P) located under said hob (Pc), and a cooling system comprising means for mixing air (9) arranged under said heating plane (P) at a rear edge (10b) of said hob (1), said hob (1) being characterized in that the system cooling system further comprises: - a ventilation duct (15) extending from the stirring means (9) and opening into an outlet zone (16) located at said front edge (10a) of the hob (1), said duct (15) discharge device (15) having an inlet end (150) located at the air-mixing means (9) so that a flow of air from the air-mixing means (9) enters into said ventilation channel (15) through said inlet end (150), and an outlet end (151) located at said exit area (16), - air deflection means (17) located in said outlet zone (16), facing said outlet end (151) of said ventilation duct (15), and being designed to reverse the flow direction of air; and at least one air outlet opening (90b) disposed at at least one lateral edge (10c, 10d) of the hob (1), close to a heating element (3), said heating element (3) being placed between said outlet zone (16) and said at least one air discharge opening (90b). Cooktop according to claim 1, characterized in that it comprises at least one discharge recess (21a, 21b) located at at least one lateral edge (10c, 10d) of said hob (1 ), close to at least one heating element (3), said at least one heating element (3) being placed between said outlet zone (16) and said at least one evacuation cavity (21a, 21b) . Cooktop according to one of claims 1 or 2, characterized in that it comprises at least one discharge recess (21a, 21b) located at each side edge (10c, 10d) of said hob (1), near at least one heating element (3), said at least one heating element (3) being placed between said zone outlet (16) and said at least one discharge recess (21a, 21b). Cooktop according to one of claims 2 or 3, characterized in that the at least one discharge recess (21a, 21b) is formed by support plates (4) on which said heating elements are positioned ( 3). Cooktop according to one of Claims 1 to 4, characterized in that it comprises an electronic card (6) for managing the operation of the hob (1) situated under the said heating plane (P), the evacuation duct (15) being delimited by two lateral walls (15a, 15b), by a first face (6a) of the electronic card (6) and by a support piece (14) on which said electronic card is placed. (6) and said stirring means (9). Cooktop according to one of claims 1 to 5, characterized in that the cooling system further comprises two substantially vertical outlet side walls (160, 161) located in the outlet area (16) on the other hand. other of the ventilation duct (15) and connecting the outlet end (151) of the exhaust duct (15) and the air deflection means (17). Cooktop according to Claim 6, characterized in that the outlet side walls (160, 161) extend towards the front edge (10a) of the cooking hob (1) with respect to a transverse axis (A1). of the hob (1). Hob according to one of Claims 6 or 7, characterized in that the outlet side walls (160, 161) are bevelled, an upper side (160a, 161a) of the outlet walls (160, 161). being rectilinear and inclined so that the upper side (160a, 161a) of the outlet sidewalls (160, 161) at the outlet end (151) of the vent duct (15) is located in a plane at below a plan in which upper sides (160a, 161a) are located at the deflection means (17). Cooktop according to Claim 8, characterized in that the upper sides (160a, 161a) of the outlet side walls (160, 161) respectively form with a horizontal plane an angle (Δ ') of a value of between 5 ° and 20 °. Cooktop according to one of Claims 1 to 9, characterized in that the air deflection means (17) comprise a first substantially vertical wall (170) arranged facing the outlet end (151) of said ventilation duct (15), said first wall (170) having at least one first curved zone (171) forming a recess facing the outlet end of the evacuation duct (15). Cooktop according to claim 10, characterized in that said air deflection means (17) further comprises a second wall (172) extending between a bottom wall (140) of the ventilation duct (15) and said first wall (170) in a plane inclined with respect to said cooking plane (Pc). Cooktop according to claim 11, characterized in that said inclined plane forms an angle with a plane in which the bottom wall of the ventilation duct extends between 15 ° and 45 °. Cooktop according to one of claims 1 to 12, characterized in that the at least one air outlet opening (90b) is positioned so that the air flow out of the cooktop (1 ) in an oblique direction (D1) with respect to a transverse axis (A1) of the hob (1). Cooktop according to one of claims 1 to 13, characterized in that said at least one air outlet opening (90b) is a slot extending longitudinally along oblique axes (A2) with respect to a transverse axis (A1) of the hob (1) and forming with said rear edge (10b) of the hob (1) an angle of between 30 ° and 60 °. Cooktop according to one of Claims 1 to 14, characterized in that it comprises second air outlet openings (90c) situated between the rear edge (10b) and at least one lateral edge (10c, 10d).

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