BE1027411B1 - INDUCTION OF COOKING UNIT AND INTEGRATION IN COOKING FURNITURE - Google Patents

Abstract

The present invention relates to an induction cooking unit, suitable for integration in a cooking cabinet, comprising a housing provided with one or more inductive heating elements and a top plate provided above the said heating elements, the top plate having a surface suitable for receiving and heating cooking equipment such as cooking pans, characterized in that the top plate is a sintered stone. The invention also relates to a cooking cabinet provided with at least one induction cooking unit. Finally, the invention also relates to a method for the production of an induction cooking unit or a cooking cabinet.

Description

BE2019 / 5427

INDUCTION OF COOKING UNIT AND INTEGRATION IN COOKING FURNITURE

TECHNICAL DOMAIN The invention relates to an induction cooking unit, suitable for integration into a cooking cabinet. In a second aspect, the invention also relates to a cooking cabinet provided with at least one induction cooking unit.

In another aspect, the invention also relates to a method for the production of an induction cooking unit and a cooking cabinet.

STATE OF THE ART Household appliance manufacturers have been supplying stoves for many years to heat food to temperatures of 100 ° C and more. Many of these stoves are already flat to a significant extent, such as, for example, with vitroceramic and induction plates. Nonetheless, there remains a need for a cooking unit that is easy to clean and avoids food spillage when cooking equipment is pushed to or from the cooking unit. Such a device is known inter alia from US2017 / 0006668. This document describes a kitchen unit with an inductive heating element that is mounted under a cooking zone in the worktop. Both the cooking zone and the rest of the worktop are made of marble or granite and form one whole. This known device has a number of drawbacks and problems. The cooking zone and the worktop form one whole. During cooking, the cooking zone will be heated up by the cooking material, which causes local expansion in the marble or granite and creates a thermal stress in the material. This stress can result in the marble or granite cracking. A further disadvantage is that marble and granite are not very scratch and shock resistant. Sliding cooking materials back and forth on the cooking zone and the worktop can result in scratches and removes the shine from the material, especially with marble. If cooking material accidentally falls on the cooking zone or worktop, this can fall

° BE2019 / 5427 the chipping of material or breaking of the worktop or cooking zone result. An additional problem is that because the cooking zone and the worktop form one whole, in the event of damage to the cooking zone or the worktop or in the event of a defect to the inductive heating element, the damage cannot be easily repaired or the defective part cannot be replaced quickly. Marble and granite can also easily stain. Spills of food, drinks and oil can stain the stone. Dull spots can also occur on granite and marble in particular due to the use of acids.

The present invention aims to solve at least one of the above problems and drawbacks.

SUMMARY OF THE INVENTION In a first aspect, the present invention relates to a device according to claim 1. The advantage of the invention mainly concerns the choice of material for the top plate and the manner of mounting a housing with one or more inductive heating elements on this top plate. The prior art describes a marble or granite worktop with an integrated cooking zone described therein. This solution has the disadvantage that the material is not very shock, scratch and stain resistant. In addition, there is a real chance that if cooking materials fall onto the cooking zone in the worktop, the cooking zone will break or chip. Finally, the prior art device has the additional problem that during cooking the cooking zone heats up and expands locally, which creates thermal stress and can lead to possible fractures in the material. In the present invention, many of these problems are overcome by a careful selection of parameters that the top plate material must meet. The parameters determine the coefficient of linear expansion, the open porosity of the material, the breaking strength, the coefficient of restitution, the resistance to deep wear, the thermal shock resistance, the chemical resistance and the stain resistance.

Using heat resistant adhesive with a large tear elongation to attach a housing with one or more inductive heating elements to the top plate,

absorbs differences in expansion during heating of the top plate and the housing and thus avoids the occurrence of large thermal stresses in both materials. Preferred forms of the device are set out in claims 2 to 10. In a second aspect, the present invention relates to a device according to claim

11.

Prior art devices such as US2017 / 0006668 not only have the problem that during cooking the cooking zone heats up and expands locally, which creates thermal stress and can lead to possible fractures in the material, but also it is difficult to easily repair such fractures. to recover. If the inductive heating element is defective, it cannot be replaced quickly. These problems are overcome in the present invention by mounting an induction cooking unit according to claims 1-10 in a recess in the worktop. Between the induction cooking unit and the edge of the recess in the worktop is an opening that is filled with heat-resistant glue. The possible expansion of the top plate of the induction cooking unit due to local heating during cooking can be absorbed by the heat-resistant glue in the opening. This creates minimal thermal stresses in the material. The induction cooking unit rests on spacers on horizontal mounting plates under the worktop. If the induction cooking unit needs to be replaced, the heat resistant adhesive can be cut away along the straight edge of the recess and the induction cooking unit can be lifted out of the recess.

Preferred forms of the device are set out in claims 12 to 19.

In a third aspect, the present invention relates to a method according to claim

This method has the advantage, inter alia, that devices according to claims 1-10 and according to claims 11-19 can be produced in a fast and repeatable manner.

DESCRIPTION OF THE FIGURES Figure 1 shows a cross-sectional view of an embodiment of the present invention in which an induction cooking unit has not yet been installed in the cooking cabinet.

Figure 2 shows a top view of an embodiment of the present invention, in which an induction cooking unit has not yet been arranged in the cooking cabinet.

Figure 3 shows a cross-sectional view of an embodiment of the present invention, in which the induction cooking unit is mounted in the cooking cabinet.

DETAILED DESCRIPTION Unless otherwise defined, all terms used in the description of the invention, including technical and scientific terms, have the meaning as commonly understood by those skilled in the art of the invention. For a better assessment of the description of the invention, the following terms are explicitly explained.

A sintered stone is a stone that has been formed by compacting and forming a solid mass of material by heat or pressure, without bringing the material to its melting point.

In this text, a top plate is understood to mean a surface that is suitable for receiving and heating cooking materials such as cooking pans.

Inductive heating elements are electrical elements that can generate an external alternating magnetic field with which eddy currents can be generated in an electrically conductive object and thereby generate heat in that object.

The coefficient of the mean restitution or COR (coefficient of restitution) is considered in the present invention as the ratio between the final and initial velocity between two objects after they collide. The coefficient normally has a value from 0 to 1 where 0 indicates a perfect inelastic collision and 1 a perfect elastic collision. The coefficient is a measure of the shock resistance of a material.

> BE2019 / 5427 A spacer is a mechanical means to keep two objects at a certain distance from each other. In a first aspect, the invention relates to an induction cooking unit, suitable for integration into a cooking cabinet. According to a preferred embodiment of the induction cooking unit, the induction cooking unit comprises a housing. The housing contains one or more inductive heating elements. The inductive cooking unit further comprises a top plate, provided above the said heating elements, the top plate having a surface suitable for receiving and heating cooking material such as cooking pans. In particular, the top plate will consist of a sintered stone comprising at least silicon aluminates, amorphous silica, crystalline silica, zirconium and inorganic pigments and the proportion of crystalline silica being less than 11% by weight. The choice of top plate composition was optimized in order to create an abrasion resistant, thermal resistant top plate. The sintered stone according to the invention can be obtained by applying the correct pressure, the correct temperature and the correct composition. These are obvious to a skilled artisan.

In one embodiment, the top plate is further characterized by a coefficient of linear expansion which, measured according to the method UNE EN ISO 10.545-8, is a minimum of 0.1.106 / ° C and a maximum of 7.5.106 / ° C. Within this range, the linear expansion of the top plate due to local heating by the hot cooking material is sufficiently small not to cause thermal stresses in the top plate that could lead to breakage. In another or further embodiment, the top plate is characterized by an open porosity which, according to the method UNE EN ISO 10.545-3, is a minimum of 0.05% and a maximum of 0.50%, such as 0.20%. With such density, water absorption from boiling water and on drying is very low, which are important properties for a top plate on which to cook. In another or further embodiment, the top plate is characterized by an average breaking strength according to the method UNE EN ISO 10.545-4 of at least

13,000 N and maximum 15,500 N. Such breaking strength typifies strong materials that will not break if cooking material accidentally falls on the top plate.

© BE2019 / 5427 The top plate is preferably a minimum of 4 mm to a maximum of 12 mm thick, such as 6 mm thick. Thinner top plates lose too much strength and stiffness and thicker top plates can affect the proper operation of the inductive heating elements.

The inductive cooking unit also includes a heat-resistant adhesive that adheres the housing to the top plate. The heat resistant adhesive is applied at a small distance from the circumference of the top plate on the bottom side, minimum 3 mm, maximum 10 mm from the edge, such as 5 mm from the edge.

In one embodiment, the heat-resistant adhesive is applied at a small distance from the circumference of the top plate on the underside, minimum at 3 mm, maximum at 10 mm from the edge, such as 5 mm from the edge. Within this contour formed by heat-resistant glue, a cartridge of heat-resistant glue is disposed, the cartridge departing near a corner at the bottom of the top plate and running back and forth over the bottom of the top plate, ending at an opposite corner. The heat-resistant adhesive of the cartridge is a minimum of 3 mm and a maximum of 50 mm from the edge of the outline previously formed by the heat-resistant glue, such as 20 mm, and between each reciprocating movement of the heat-resistant glue is a distance of a minimum of 3 mm and maximum 50 mm, such as 20 mm. In one embodiment, the heat resistant adhesive is applied in a cartridge, the cartridge departing near one corner of the bottom of the top plate and running back and forth across the bottom of the top plate and ending at an opposite corner. The heat-resistant adhesive of the cartridge is a minimum of 3 mm and a maximum of 10 mm from the edge of the top plate, such as 5 mm, and between each reciprocating movement of the heat-resistant glue is a distance of minimum 3 mm and maximum 50 mm, such as 20 mm.

According to one embodiment of the induction cooking unit, the top plate is characterized by a coefficient of average refund, which according to the method UNE EN ISO

10.545-5 is 0.85 + 0.10. At such a coefficient of restitution, the top plate has good impact resistance. In the event of an accidental fall of cooking material onto the top plate, the risk of material peeling off the top plate is small.

According to one embodiment of the induction cooking unit, the top plate is characterized by a resistance to deep wear, whereby the volume worn according to the method UNE EN ISO 10.545-6 is at least 100 mm? and a maximum of 130 mm? is. Wear-resistant material for the top plate is possible within this range. Higher values of the abraded volume indicate materials that are susceptible to wear. Moving cooking materials will then scratch the top plate. According to one embodiment of the induction cooking unit, the top plate is characterized by a thermal shock resistance, the test result according to the method UNE EN ISO 10.545-9 being no damage. This is required because the top plate can be heated to a high temperature by the cookware and cooled very quickly afterwards during clean-up or accidental spillage of a cold liquid.

According to one embodiment of the induction cooking unit, the top plate is characterized by chemical resistance to cleaning agents, bleach, HCL (3% V / V), citric acid (100 g / l), KOH (30 g / l), HCL (18% V) / V), lactic acid (5% V / V), KOH (100 g / L) where the test result according to the method UNE EN ISO 10.545-13 is no damage. The mentioned chemicals can be used as a (strong) cleaning agent in the kitchen or as a component in a foodstuff. According to one embodiment of the induction cooking unit, the top plate is characterized by a determination of the stain resistance to a green agent, an iodine solution and an olive oil, the class according to the method being UNE EN ISO 10.545-145. Class 5 means that stains can be removed with a green agent, with an iodine solution and with olive oil after 24 hours with warm water. This makes the top plate easy to maintain and prevents permanent stains.

According to one embodiment of the induction cooking unit, the heat-resistant adhesive is at least resistant to temperatures of -20 ° C to + 245 ° C and the tear elongation of the heat-resistant adhesive according to ISO 37, S3A is minimum 100% and maximum 800%. The top plate has a low linear expansion coefficient of minimum 0.1.106 / ° C and maximum 7.5.106 / ° C. The coefficient of expansion of metal is typically greater. For aluminum, the coefficient of linear expansion is typically 23.0.106 / ° C. During cooking, both the top plate and the housing, which is made of aluminum, for example, can heat up and expand. With the same heating of the housing and the top plate, this will result in different expansion of both materials.

The heat-resistant adhesive must be able to absorb this and stretch sufficiently before tearing. Adhesives with a crack elongation of between 100% and 800% have sufficient margin to accommodate differences in expansion between the top plate and the housing without cracks. Furthermore, the heat-resistant adhesive must retain its properties within a wide temperature range. A non-limiting example of such an adhesive is Novasil® S76. According to one embodiment of the induction cooking unit, the housing comprises ventilation openings. According to the principle of an inductive heating element, the heat is generated directly in the cooking material itself and the inductive heating element, unlike resistive electric heating elements, does not need to heat up. Nevertheless, the large currents in the coils of the inductive heating elements can cause local heating and the inductive heating element must be able to cool. This is possible, for example, because the housing has ventilation openings all around in the upright edge of the housing. These vents can be circular, oval, rectangular or square. The ventilation openings allow passive cooling of the inductive heating elements.

According to another embodiment, in addition to the ventilation openings in the upright edge of the housing, additional ventilation openings are present on the underside of the housing. The additional ventilation openings on the bottom of the housing allow better air flow and cooling through the housing. The ventilation openings on the bottom can also be circular, oval, rectangular or square.

According to a further embodiment, fans are present in addition to the ventilation openings in the upright edge and on the underside of the housing. The fans can draw in air through the ventilation openings on the underside of the housing, which can flow through the housing and exit the housing via the ventilation openings in the raised edge of the housing. This can provide a forced air flow and better cooling. According to one embodiment of the induction cooking unit, the shape of the housing and the top plate is the same and the area of the housing is smaller or equal to the area of the top plate. As a result, seen from above, the top plate of the induction cooking unit is the largest dimension, which means that the installation in a recess of

? BE2019 / 5427 simplifies a worktop because the installer only has to check the visible dimensions of the top during installation.

According to one embodiment of the induction cooking unit, the shape of the housing and the top plate is a circle, a rectangle or an oval. It is clear to a person skilled in the art that other shapes are also possible. According to one embodiment of the induction cooking unit, the inductive heating elements have the ability to heat a suitable cooking pot to at least 150 ° C. In a second aspect, the invention relates to a cooking cabinet provided with at least one induction cooking unit according to one of the embodiments as described above.

According to a preferred embodiment of the cooking cabinet, the cooking cabinet comprises a worktop, wherein the worktop of the cooking cabinet has one or more recesses for one or more induction cooking units, the edge on the inside of the recess being straight. The straight edge makes it possible to remove the induction cooking unit by cutting away the heat-resistant glue between the induction cooking unit and the worktop. When using a staircase or conical shape in the edge of the recess, the heat-resistant adhesive can end up in a hard-to-reach place when applying the induction cooking unit, such as in the horizontal part of the stairs or at the bottom of the conical shape. the housing. This makes cutting away the heat resistant glue difficult or impossible. According to one embodiment of the cooking furniture, a vertical profile is mounted on the underside of the worktop on at least two opposite sides of a recess, preferably on all sides of a recess. This vertical profile can be an L-profile, where the short leg of the L-profile is attached to the underside of the worktop and the long leg points vertically downwards. The distance between the vertical leg of the L-profile and the edge of the recess is minimum 5 mm and maximum 50 mm, such as 15 mm. This distance simplifies the installation of the inductive cooking unit in the recess because the induction cooking unit does not have to slide along the vertical profile.

According to one embodiment, the profile is a Z-profile comprising a short horizontal leg at the top, a long vertical leg and a short horizontal leg at the bottom, the top short leg of the Z-profile being attached to the bottom of the worktop and towards the recess. with the long leg pointing vertically down and the lower short leg pointing away from the recess. Due to the presence of the lower short leg, there is no sharp edge on the side of the recess as with the L-profile, which can avoid injuries to the installer during installation of the induction cooking unit. The distance between the vertical leg of the Z-profile and the edge of the recess is a minimum of 5 mm and a maximum of 50 mm, such as 15 mm. This distance simplifies the installation of the inductive cooking unit in the recess because the induction cooking unit does not have to slide along the vertical profile.

According to one embodiment of the cooking cabinet, a horizontal mounting plate is mounted on a vertical profile in at least 4 corners of a recess, at least 2 cm and at most 20 cm below the top of the worktop, with a mounting opening for a spacer in each mounting plate, and wherein each mounting hole falls within the cutout a minimum of 0.5 cm and a maximum of 10 cm beyond the edge of the cutout.

According to one embodiment, the horizontal mounting plates are rectangular plates mounted on the vertical profiles along the shortest sides of the recess.

According to a further embodiment, the horizontal mounting plates are rectangular plates which are mounted simultaneously on a vertical profile along the shortest sides and on a vertical profile along the longest sides of the recess.

According to one embodiment, the horizontal mounting plates are triangular plates mounted on the vertical profiles along the shortest sides of the recess.

According to one embodiment, the horizontal mounting plates are triangular plates which are mounted simultaneously on a vertical profile along the shortest sides and on a vertical profile along the longest sides of the recess.

According to one embodiment, in addition to the horizontal fixing plates in the 4 corners of the recess, intermediate horizontal fixing plates are mounted on the vertical profiles along the longest side and / or shortest side of the recess. These additional intermediate mounting plates are useful to distribute the weight of the induction cooking unit over additional horizontal mounting plates in the case of a large top plate and housing. According to one embodiment of the cooking furniture, an induction cooking unit rests in a recess on at least 4 spacers, which are mounted in the mounting openings of the mounting plate. The spacers support the weight of the induction cooking unit, relieving the heat-resistant adhesive between the induction cooking unit and the worktop of the kitchen unit in the vertical direction. In one embodiment, the spacers are cylinders sawn to size and mounted in the mounting openings in the horizontal mounting plates.

In one embodiment, the spacers are bolts threaded into the mounting holes in the horizontal mounting plates to the correct height and secured with a nut on the other side of the horizontal mounting plates. The nut is attached to the bolt with glue. A non-limiting example of a suitable adhesive is Loctite 290. According to one embodiment of the cooking cabinet, the top of an induction cooking unit is aligned with the top of the worktop. This ensures a smooth transition between the worktop of the cooking unit and the top of the induction cooking unit, which is aesthetically pleasing, but also prevents food from spilling when cooking equipment is pushed to or from the induction cooking unit. According to one embodiment of the cooking cabinet, there is an opening of 1 to 4 mm, such as 3 mm, between an induction cooking unit and the edge of a recess. The opening is sufficiently large within this range to accommodate the linear expansion of the induction cooking unit when heating, as well as to allow easy installation of the induction cooking unit in a recess. Within this range it is possible to apply heat resistant glue in the gap between the edge of the recess and the induction cooking unit. This is difficult to achieve in practice for smaller openings. Larger openings require a lot of glue and is not aesthetically pleasing.

According to one embodiment of the cooking cabinet, the gap between the edge of a recess and an induction cooking unit is filled with a heat-resistant adhesive. The filling of the opening is necessary for hygienic reasons to prevent food residues or dirt from accumulating in the opening.

According to one embodiment of the cooking cabinet, the heat-resistant adhesive is at least resistant to temperatures of -20 ° C to + 245 ° C and the tear elongation of the heat-resistant adhesive is at least 100% and at most 800% according to ISO 37, S3A. During cooking, the induction cooking unit can heat up and switch off. The heat-resistant adhesive in the gap between the edge of the recess and the induction cooking unit must be able to absorb this and sufficiently stretch and shrink before tearing. Glues with a tear elongation between 100% and 800% have sufficient elongation to absorb the expansion and contraction of the induction cooking unit without cracks. The heat-resistant glue can heat up during cooking, which means that it must retain its properties within a wide temperature range. A non-limiting example of such an adhesive is Novasil® S76. In a further aspect, the invention relates to a method for the production of an induction cooking unit and a cooking cabinet as described above in one of the embodiments. According to a preferred embodiment of the method, it comprises several steps. The housing is glued to the top plate with heat resistant glue. The heat resistant adhesive is applied at a small distance from the circumference of the top plate on the bottom side, minimum at 3 mm, maximum at 10 mm from the edge, such as at 5 mm. In another embodiment, the heat resistant adhesive is applied at a small distance from the circumference of the top plate on the bottom side, minimum at 3 mm, maximum at 10 mm from the edge, such as at 5 mm. Within this outline formed by heat resistant glue, a cartridge of heat resistant glue is applied, the cartridge departing near a corner at the bottom of the top plate and running back and forth over the bottom side of the top plate and ending at an opposite corner. The cartridge heat-resistant adhesive is a minimum of 3 mm and a maximum of 50 mm from the edge of the outline previously formed by the heat-resistant adhesive, such as 20 mm, and between each reciprocating movement of the heat-resistant adhesive is a distance of at least 3 mm and maximum 50 mm, such as 20 mm.

In yet another embodiment, the heat resistant adhesive is applied in a cartridge 5, the cartridge departing near a corner at the bottom of the top plate and running back and forth across the bottom of the top plate and ending at an opposite corner. The heat-resistant adhesive of the cartridge is a minimum of 3 mm and a maximum of 10 mm from the edge of the top plate, such as 5 mm, and between each reciprocating movement of the heat-resistant glue is a distance of minimum 3 mm and maximum 50 mm, such as 20 mm. A recess is made in the worktop of the kitchen unit, whereby the recess on each side is at least 1 mm and at most 4 mm larger than the induction cooking unit, such as 3 mm, and with the edge on the inside of the recess being straight. Vertical profiles are mounted on at least two opposite sides of a recess, but preferably all sides. According to one embodiment, an L-profile is mounted, wherein the short leg of the L-profile is attached to the underside of the worktop and the long leg points vertically downwards. The distance between the vertical leg of the L-profile and the edge of the recess is a minimum of 5 mm and a maximum of 50 mm, such as 15 mm.

According to one embodiment, a Z-profile is mounted, with the top short leg of the Z-profile attached to the bottom of the worktop and pointing towards the recess, the long leg pointing vertically down and the bottom short leg away from the recess points. The distance between the vertical leg of the Z-profile and the edge of the recess is a minimum of 5 mm and a maximum of 50 mm, such as 15 mm. At least 4 mounting plates with a mounting opening are attached to a vertical profile in 4 corners of a recess, with the mounting opening within the recess at least 0.5 cm and a maximum of 10 cm beyond the edge of the recess.

According to one embodiment, the horizontal mounting plates are rectangular plates which are mounted on the vertical profiles along the shortest sides of the recess.

According to a further embodiment, the horizontal mounting plates are rectangular plates which are mounted simultaneously on a vertical profile along the shortest sides and on a vertical profile along the longest sides of the recess.

According to one embodiment, the horizontal mounting plates are triangular plates which are mounted on the vertical profiles along the shortest sides of the recess.

According to one embodiment, the horizontal mounting plates are triangular plates which are mounted simultaneously on a vertical profile along the shortest sides and on a vertical profile along the longest sides of the recess. According to one embodiment, in addition to the horizontal fixing plates in the 4 corners of the recess, intermediate horizontal fixing plates are mounted on the vertical profiles along the longest side and / or shortest side of the recess.

Spacers are placed in the mounting holes. The induction cooking unit is placed in a recess, with an opening between the induction cooking unit and the edge of the recess of a minimum of 1 mm and a maximum of 4 mm, such as 3 mm, around the induction cooking unit.

The top of the induction cooking unit is aligned with the top of the worktop using the spacers.

The gap between the edge of the recess and the induction cooking unit is filled with heat-resistant glue.

DESCRIPTION OF THE FIGURES Figure 1 shows a cross-sectional view of an embodiment of the cooking cabinet, in which no induction cooking unit has yet been arranged in the cooking cabinet.

A recess 1 is provided in the worktop 4.

The edge 2 of the recess 1 is straight and vertical.

A vertical profile 10 is mounted on both sides of the recess 1 under the worktop 4.

In the illustrated embodiment, the vertical profile 10 is a Z profile.

Horizontal mounting plates 9 are attached to the vertical profiles 10.

These horizontal mounting plates 9 have mounting openings 8 in which spacers 7 are placed.

Figure 2 shows a top view of an embodiment of the present invention, in which an induction cooking unit has not yet been arranged in the cooking cabinet.

A recess 1 is provided in the worktop 4.

The edge 2 of the recess 1 is straight and vertical.

A vertical profile 10 is mounted around the recess 1 under the worktop 4.

In the illustrated embodiment, the vertical profile 10 is a Z profile.

Horizontal mounting plates 9 are attached to the vertical profiles 10.

In the illustrated embodiment, the horizontal mounting plates 9 are triangles.

These horizontal mounting plates 9 have mounting openings 8. The mounting openings 8 fall within the recess 1. Figure 3 shows a cross-sectional view of an embodiment of the present invention, in which the induction cooking unit is arranged in the cooking cabinet.

A recess 1 is provided in the worktop 4.

The edge 2 of the recess 1 is straight and vertical.

A vertical profile 10 is mounted on both sides of the recess 1 under the worktop 4.

In the illustrated embodiment, the vertical profile 10 is a Z profile.

Horizontal mounting plates 9 are attached to the vertical profiles 10.

These horizontal mounting plates 9 have mounting openings 8 in which spacers 7 are placed.

An induction cooking unit 13 comprises a top plate 5, a housing 6 comprising at least one or more inductive heating elements and a heat-resistant adhesive 11 with which the top plate 5 and the housing 6 are glued together.

The housing 6 comprises one or more ventilation openings 12. The induction cooking unit 13 is placed centrally in the recess 1.

The induction cooking unit 13 rests on the spacers 7. The spacers 7 are adjusted so that the top plate 5 and the top of the worktop 4 are aligned.

Between the edge 2 of the recess 1 and the induction cooking unit 13 is an opening 3. This opening 3 is filled with heat-resistant glue 14.

EXAMPLES The invention will now be further elucidated by means of the following example, without otherwise being limited thereto. EXAMPLE 1 Example 1 concerns the installation of an induction cooking unit in a stainless steel cooking cabinet. The stainless steel cooking cabinet has a composite worktop comprising a stainless steel plate with a thickness of 3 mm with a wooden plate underneath for reinforcement. A rectangular cut-out of 560 mm by 490 mm has been made in this worktop. Z-profiles with a thickness of 3 mm are mounted along both the short side and the long side of the recess. The long leg of the Z profile points vertically downwards. The top leg of the Z-profile points to the recess and is fixed by spot welding to the underside of the stainless steel plate of the composite worktop. For this, a strip of the wooden plate has been removed from around the recess. This strip is the same size as the length of the top leg. The top leg is flush with the edge of the recess, giving the edge of the recess a total thickness of 6 mm. The lower leg of the Z-profile points inwards, so that a tube without sharp edges is formed under the worktop at the level of the recess through the Z-profiles. This is advantageous for the manufacturer and the installer of the cooking cabinet, because injuries are avoided when placing and connecting the induction cooking unit. 6 cm below the top of the worktop, horizontal triangles are mounted on the Z-profiles along the shortest side of the recess. These triangles are placed in the 4 corners of the recess and are spot welded to the Z-profiles along the shortest side of the recess. Each triangle has a mounting opening which is located inside the recess and into which a threaded bush is pressed at the bottom. A bolt is screwed through the bottom of the bush. A nut is fitted to the top of the bolt. This nut has not yet been tightened. The combination of the bushing with the bolt and the nut forms the spacer.

U BE2019 / 5427 An induction cooking unit with dimensions 554 mm and 484 mm is fitted in the recess.

The induction cooking unit is placed on the 4 spacers from above.

The induction cooking unit is positioned in such a way that around the induction cooking unit there is a gap of 3 mm between the edge of the recess and the induction cooking unit.

Then the 4 spacers are adjusted.

When a corner of the induction cooking unit protrudes above the worktop of the stainless steel kitchen furniture, the bolt is unscrewed until that corner of the induction cooking unit is aligned with the top of the worktop.

If the angle of the induction cooking unit is lower than the worktop, the bolt is screwed in.

This process is repeated at all angles until the top plate of the induction cooking unit is aligned with the stainless steel worktop.

After alignment, the spacer positions are secured by applying glue, for example Loctite 290, to the portion of the screw thread that extends just above the triangles and tightening the nuts against the triangles.

After the adhesive has dried out, the nut will prevent the bolt from turning further in or out of the bush due to vibrations, for example.

The 3 mm wide gap between the top plate of the induction cooking unit and the 6 mm high edge of the recess is filled with heat-resistant glue.

Care is taken to ensure that the glue only ends up in the opening and not on the top plate or on the worktop.

After the glue has dried, the induction cooking unit is attached to the kitchen unit.

In the event that the induction cooking unit needs to be replaced, this can be done quickly and easily by cutting from above through the heat-resistant adhesive in the opening with the help of, for example, a knife.

The straight vertical edge around the recess does not hinder the knife.

There is also no heat resistant glue that can fill a hidden recess or stairs, making it difficult to detach the induction cooking unit.

After cutting, the induction cooking unit can be lifted up out of the cooking cabinet.

Only the edges of the recess have to be cleaned of glue residues, after which a new induction cooking unit can be placed in the cooking cabinet in a similar way as described above.

EXAMPLE 2 Example 2 concerns a comparison between 2 sintered bricks in which material 1 is according to the invention and material 2, porcelain, does not comply with the invention.

Material 2 has a typical coefficient of linear expansion according to UNE EN ISO

10.545-8 of 3.0.106 / ° C and will therefore not expand much due to local warming. Material 2 is hereby, just like material 1, in the prescribed range for the invention. The limited expansion of both material 1 and material 2 is beneficial for avoiding thermal stresses. The open porosity according to the method UNE EN ISO 10.545-3 is sufficiently low for both material 1 and material 2. Water absorption is low for both materials, which are important properties for a top plate on which to cook. The average breaking strength according to UNE EN ISO 10.545-4 for material 2 is at least 1,300 N. This is much lower than the minimum strength of 13,000 N that material 1 complies with. Tests in which cookware falls on the top plate of the induction cooking unit does not damage material 1, while material 2 flakes off material or the top plate breaks completely. In contrast to material 1, material 2 is not suitable as a top plate for an induction cooking unit.

Claims (1)

CONCLUSIONS Induction cooking unit, suitable for integration into a cooking cabinet, comprising a housing provided with one or more inductive heating elements and a top plate provided above the said heating elements, the top plate having a surface suitable for receiving and heating cooking material such as cooking pots. characterized in that the top plate is a sintered stone comprising at least silicon aluminates, amorphous silica, crystalline silica, zirconium and inorganic pigments and wherein the proportion of crystalline silica is less than 11% by weight; and a heat-resistant adhesive with which the housing is adhered to the top plate and in which the linear expansion coefficient of the top plate according to the method UNE EN ISO 10.545-8 is a minimum of 0.1.106 / ° C and a maximum of 7.5.106 / ° C, the open porosity of the top plate according to the method UNE EN ISO 10.545-3 is a minimum of 0.05% and a maximum of 0.50% and the average breaking strength of the top plate according to the method UNE EN ISO 10.545-4 is a minimum of 13,000 N and a maximum of 15,500 N. Induction cooking unit according to claim 1, in which the coefficient of the mean restitution of the top plate according to the method UNE EN ISO 10.545-5 is 0.85 + 0.10. Induction cooking unit according to the preceding claims 1-2, wherein the worn-off volume in the determination of the resistance to deep wear of the top plate according to the method UNE EN ISO 10.545-6 is at least 100 mm? and a maximum of 130 mm? is. Induction cooking unit according to the preceding claims 1-3, wherein the test result in the determination of the thermal shock resistance of the top plate according to the method UNE EN ISO 10.545-9 is no damage. Induction cooking unit according to the preceding claims 1-4, wherein the test result when determining the chemical resistance of the top plate to cleaning agents, bleach, HCL (3% V / V), citric acid (100 g / l), KOH (30 g / l), HCL (18% V / V), lactic acid (5% V / V), KOH (100 g / L) according to the method UNE EN ISO 10.545-13 is no damage. Induction cooking unit according to the preceding claims 1 - 5, wherein the class in the determination of the stain resistance against a green agent, an iodine solution and an olive oil of the top plate according to the method UNE EN ISO 10,545-14 is 5. Induction cooking unit according to the preceding claims 1-6, wherein the heat-resistant adhesive is at least resistant to temperatures from -20 ° C to + 245 ° C and the tear elongation of the heat-resistant adhesive according to ISO 37, S3A is at least 100% and at most 800%. . 8. Induction cooking unit according to the preceding claims 1-7, wherein the housing comprises ventilation openings. Induction cooking unit according to the preceding claims 1-8, wherein the shape of the housing and the top plate is the same and the surface of the housing is smaller or equal to the surface of the top plate. Induction cooking unit according to any one of the preceding claims 1-9, wherein the inductive heating elements have the capacity to heat a suitable cooking pot to at least 150 ° C. Cooking cabinet provided with at least one induction cooking unit according to any one of claims 1-10. Cooking cabinet according to claim 11, wherein the worktop of the cooking cabinet has one or more recesses for one or more induction cooking units, the edge on the inside of the recess being straight. 13. Kitchen cabinet according to the preceding claims 11-12, wherein a vertical profile is mounted on the underside of the worktop on at least two opposite sides of a recess, preferably on all sides of a recess. 14. Cooking cabinet according to the preceding claims 11-13, in which a horizontal mounting plate is mounted on a vertical profile in at least 4 corners of a recess, at least 2 cm and a maximum of 20 cm below the top of the worktop, with a mounting opening for each mounting plate. a spacer, and each mounting hole + BE2019 / 5427 falls at least 0.5 cm and a maximum of 10 cm beyond the edge of the recess within the recess. Cooking furniture according to the preceding claims 11-14, wherein an induction cooking unit rests in a recess on at least 4 spacers, which are mounted in the mounting openings of the mounting plate. Cooking cabinet according to the preceding claims 11-15, wherein the top of an induction cooking unit is aligned with the top of the worktop. 17. Kitchen furniture according to the preceding claims 11-16, in which there is an opening of 1 to 4 mm between an induction cooking unit and the edge of a recess. 18. Kitchen furniture according to the preceding claims 11-17, wherein the gap between the edge of a recess and an induction cooking unit is filled with a heat-resistant glue. 19. Kitchen furniture according to the preceding claims 11-18, wherein the heat-resistant adhesive is at least resistant to temperatures of -20 ° C to + 245 ° C and the tear elongation of the heat-resistant adhesive according to ISO 37, S3A is at least 100% and at most 800%. A method for the production of an induction cooking unit according to the preceding claims 1 to 10 and a cooking unit according to the preceding claims 11 to 19, comprising the following steps: gluing the housing with heat-resistant glue to the top plate; making a recess in the worktop of the kitchen furniture, whereby the recess on each side is at least 1 mm and at most 4 mm larger than the induction cooking unit and where the edge on the inside of the recess is straight; mounting vertical profiles on at least two opposite sides, preferably all sides, of a recess; fixing at least 4 mounting plates with a mounting opening in 4 corners of a recess to a vertical profile, whereby the mounting opening falls within the recess at least 0.5 cm and at most 10 cm beyond the edge of the recess; placing spacers in the mounting holes; placing the induction cooking unit in a recess with an opening between the induction cooking unit and the edge of the recess of a minimum of 1 mm and a maximum of 4 mm around the induction cooking unit; aligning the top of the induction cooking unit with the top of the worktop using the spacers; and filling the gap between the edge of the recess and the induction cooking unit using heat resistant glue.