WO2023213616A1

WO2023213616A1 - Radiant heater and cooktop having a radiant heater

Info

Publication number: WO2023213616A1
Application number: PCT/EP2023/060819
Authority: WO
Inventors: Jochen Rickert
Original assignee: E.G.O. Elektro-Gerätebau GmbH
Priority date: 2022-05-03
Filing date: 2023-04-25
Publication date: 2023-11-09
Also published as: DE102022204359A1

Abstract

Disclosed is a radiant heater for arranging under a cooktop panel of a cooktop, the radiant heater comprising a support, a heating element on said support, and a temperature detection device on the support, said temperature detection device being configured to detect a temperature at the underside of the cooktop panel. The temperature detection device has a thermocouple, which is arranged in an uppermost region of the temperature detection device and which lies against the underside of the cooktop panel, and an electrically insulating holder for the thermocouple. Also provided is a spring device which pushes the thermocouple resiliently away from the support, and beyond the support towards the cooktop panel, in a direction perpendicular to the surface of the support.

Description

Radiant heater and hob with a radiant heater

FIELD OF APPLICATION AND STATE OF TECHNOLOGY

The invention relates to a radiant heater for a hob, which is designed to be arranged alone or with several other similar or different radiant heaters under a hob plate of the hob. The basic arrangement of such a radiant heater under a hob plate of a hob is known to those skilled in the art. The invention further relates to a hob with a hob plate, under which at least one such radiant heater is arranged.

It is known from DE 10 2013 216 258 A1 to detect and evaluate a temperature on an underside of the hob plate by means of a temperature sensor, which is designed as a thermocouple. This is intended to avoid excessively high temperatures on the hob plate. Furthermore, temperature-controlled processes or cooking programs should possibly be able to be carried out.

Finally, such temperature sensors often also have the task of avoiding excessively high temperatures at the top of the hob plate, which is intended to protect against fire. In particular, excessive temperatures could cause oil on the hob plate or in a cooking vessel to ignite, which represents a separate safety test.

TASK AND SOLUTION

The invention is based on the object of creating a radiant heater and a hob provided with it, with which problems of the prior art can be solved and in particular it is possible to simplify production or assembly and to improve and make operation of the radiant heater safer make.

This object is achieved by a radiant heater with the features of claim 1 and by a hob with the features of claim 15. Advantageous and preferred embodiments of the invention are the subject of the further claims and are explained in more detail below. Some of the features are only described for the radiant heater or only for the hob. However, they should be able to apply independently and independently of each other to both a radiant heater and a hob. The wording of the claims is incorporated into the content of the description by express reference. The radiant heater is designed to be installed in a hob, namely to be arranged under a hob plate of the hob. The radiant heater has a support with an edge surrounding the support and at least one heating element on this support. The heating element can be designed with a flat profile on the carrier, alternatively it can also be made of thin rods, ribs or the like. consist. A temperature detection device is provided on the support, which is designed to detect a temperature on the underside of the hob plate, whereby it is intended to detect a temperature directly on the underside, i.e. advantageously the underside itself and thus actually also of a pot placed above it.

According to the invention, the temperature detection device has a thermocouple which is arranged at a top region or at the top point of the temperature detection device and/or which rests on the underside of the hob plate. It is possible that the thermocouple itself can form the uppermost region or uppermost point of the temperature detection device. The thermocouple therefore forms the temperature sensor of the temperature detection device. This also has a holder for the thermocouple, which is designed to be electrically insulating, advantageously made of appropriately electrically insulating material. Furthermore, a spring device is also provided, which is designed to resiliently press at least the thermocouple, possibly also the holder mentioned, away from the carrier in the direction perpendicular to the surface of the carrier and beyond the carrier towards the hob plate. The temperature detection device and/or the thermocouple can rest directly on the underside of the hob plate.

By designing the temperature detection device with a thermocouple as a temperature sensor, a very robust temperature detection device is created that can withstand high temperatures of up to 700°C or 800°C or even up to 1,000°C. A thermocouple is also mechanically quite robust and insensitive. This means that it can withstand being pressed against the underside of the hob plate without any damage or impairment. The thermal voltage generated by the thermocouple can also be evaluated using known circuits, which does not require much effort.

In an embodiment of the invention, the temperature detection device, in particular the holder for the thermocouple, can be designed to be tapered at its uppermost region. A smaller area can then be created on the underside of the hob plate. In addition, heat or thermal radiation can possibly reach the thermocouple from the side. The holder can possibly be conical or tapered on several sides, in particular opposite sides, for example on four sides. The thermocouple can advantageously protrude upwards over the holder, in particular with a projection of at least 0.1 mm. Preferably, an overhang can be up to a maximum of 2 mm or 3 mm. This ensures that the thermocouple is not only arranged at the highest area of the holder, but also forms the highest point of the holder and thus also of the temperature detection device. This ensures that it rests against the underside of the hob plate, thus also ensuring good thermal contact for temperature detection to the exact desired extent.

In a further embodiment of the invention, a heat distribution element can be arranged on top of the thermocouple, which, so to speak, supplies the thermocouple with a temperature averaged over a surface, which is preferably greater than that of the thermocouple itself. This makes temperature detection more accurate, in particular less susceptible to deviations from the real value on the underside due to unevenness, nubs or the like. Preferably, the surface of the heat distribution element is flat on its upper side and/or parallel to the surface of the support or to the underside of the hob plate . Such a heat distribution element can also have the advantageous function of protecting the hob plate from point loads in the event of impacts or the like. protected by the thermocouple on the underside. Such a point load then becomes a load distributed across the area, at least on the surface of the heat distribution element.

The heat distribution element preferably consists of metal, in particular steel and/or nickel, and particularly preferably the heat distribution element can be welded onto the thermocouple. This ensures that it is in good thermal contact with the thermocouple, which is also permanent. Furthermore, it is possible for such a heat distribution element not only to be additionally arranged on the thermocouple, but even to be a functional part of it. The two connection ends, which form the thermocouple by welding together, cannot be welded directly to one another, but rather at a distance from the metallic heat distribution element. This distance can be, for example, 1 mm to 3 mm distance. The materials, in particular of the heat distribution element, must then be dimensioned in such a way that the thermal voltage and thus the thermocouple are formed on the heat distribution element. Its area is of course larger than that of the pure thermocouple, but that can also be an advantage as described above.

In an embodiment of the invention, the area of such a heat distribution element can be between 2 mm ² and 200 mm ² , preferably between 8 mm ² and 50 mm ² or 100 mm ² . This area can be in the area of the cross-sectional area of the temperature detection area. direction lie. It enables a good heat connection for the thermocouple. A diameter or a width of the heat distribution element can advantageously be 4 mm to 8 mm.

The holder preferably has a holding body which can form the essential part of the holder. The thermocouple can be attached directly to this holding body, preferably by means of connections of the thermocouple. Then no further fasteners are required. Since such connections are usually stable wires, they can be used to securely and permanently attach the thermocouple to the holder or holding body. The holding body can advantageously be made of a material from the following group: ceramic, for example steatite, vermiculite, verdomite.

In an advantageous embodiment of the invention, the holder is arranged in a receiving device surrounding the holder, so that the thermocouple can be arranged exactly as specified. The holder and the receiving device can be designed such that the receiving device is fixedly arranged on the carrier, in particular it can engage in the carrier. The holder is preferably movable in the direction perpendicular to the surface of the carrier in the receiving device against the spring device. In this way, component tolerances can be compensated to ensure that the thermocouple rests on the underside of the hob plate. This is done reliably by a spring force for pressing.

The spring device can advantageously be arranged within the receiving device and below the holder, whereby it is guided, for example, and protected from excessively high temperatures. The spring device can be particularly advantageously a compression spring, preferably a helical spring. For the aforementioned temperature resistance, so that it does not lose its spring properties in the long term, the spring can preferably be made of metal, in particular made of spring steel, which is dimensionally stable up to 300 ° C or up to 600 ° C or permanently retains its shape at these temperatures .

In an embodiment of the invention, the receiving device can be an elongated sleeve with an internal cross section that corresponds to the external cross section of the holder. However, it can be enlarged by between 2% and 20% compared to this external cross section, so that the sleeve can be easily moved longitudinally in the receiving device. The two cross sections can either be circular, so that the arrangement does not matter or can be rotated. Or they deviate from a circular shape so that the holder cannot twist in the sleeve. The receiving device can preferably be made of a material from the following group: ceramic, for example steatite, vermiculite, verdomite. It can therefore be designed like the holder.

The radiant heater preferably has a receiving shell for the carrier, on which the carrier rests essentially flat, preferably a sheet metal shell. The receiving shell has a hole in the area of the temperature detection device, and the carrier in turn has a larger opening that covers this hole. The receiving device can be inserted into this opening.

The receiving device has a longitudinal opening with the internal cross section, the receiving device being inserted into the opening with a precise fit and the hole in the receiving shell sitting below the longitudinal opening of the receiving device. The aforementioned spring device can be supported on an edge of the bore of the receiving shell running within the longitudinal opening, so that no separate holding part or the like is required. necessary is.

In a further development of the invention, the holder can have two longitudinal bores next to each other, which can be separated from one another. The two connections of the thermocouple can each run separately from one another in the longitudinal bores through the holder and exit at its lower end, whereby they can preferably be led out downwards through the receiving device and the bore in the receiving shell. The longitudinal bores of the holder can extend to the uppermost region of the holder, whereby they can preferably be arranged and designed point-symmetrically to a longitudinal central axis of the holder.

The holder with the spring device can advantageously be designed in such a way that the thermocouple, preferably with an aforementioned heat distribution element, is between 1 mm and 10 mm, advantageously between 1.5 mm and 4 mm, above the highest point of the other radiant heater in the unloaded state of the spring or the carrier, preferably also an edge that surrounds the carrier or that is placed on its edge region, protrudes upwards.

In a preferred embodiment of the invention, it can be provided that the radiant heater does not have a so-called rod controller or a general thermomechanical temperature detection device. This simplifies the design since, so to speak, only a single type of temperature detection device, namely with a thermocouple, is provided. Furthermore, a safety test for a hob, namely the so-called drop test, can be carried out in this way. Test can be passed more easily because there is no risk of damage to the hob plate due to this thermomechanical temperature detection device.

In a further embodiment of the invention, it can be provided that the radiant heater has only a single temperature detection device or only a single thermocouple. This simplifies construction, assembly and temperature determination. This can also be independent of how many independently operable heating elements or heating zones the radiant heater has.

The hob according to the invention has a hob plate and at least one radiant heater arranged underneath, as described above. The thermocouple is pressed against an underside of the hob plate, in particular pressed in a resilient manner.

These and other features emerge not only from the claims but also from the description and the drawings, with the individual features being implemented individually or in groups in the form of subcombinations in one embodiment of the invention and in other areas and being advantageous and protectable in their own right may represent versions for which protection is claimed here. The division of the application into individual sections and subheadings does not limit the general validity of the statements made under them.

BRIEF DESCRIPTION OF DRAWINGS

Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the drawings show:

1 shows a section through a hob according to the invention with a hob plate and a radiant heater according to the invention with a temperature detection device arranged underneath,

Fig. 2 is a reduced oblique view of the radiant heater from Fig. 1,

3 shows an enlargement of only the temperature detection device from FIG. 1,

4 is an oblique view of the temperature detection device corresponding to FIG. 3,

5 shows a sectional view similar to FIG. 1 through a further radiant heater according to the invention with a modified temperature detection device in the upwardly pressed state of a holder,

6 shows an enlargement of only the temperature detection device from FIG. 5, Fig. 7 is an oblique view similar to Fig. 4 of the temperature detection device from Fig. 5 and

Fig. 8 is a top view of a further radiant heater according to the invention with two non-concentrically arranged heating zones and a temperature detection device arranged on the edge.

DETAILED DESCRIPTION OF THE EMBODIMENTS

1 shows a sectional view through an area of a hob 11 according to the invention. This hob 11 has a hob plate 12, advantageously consisting of conventional glass ceramic, which has an underside 13. Not shown here, but often found in practice, the underside 13 has a knobbed structure with knobs that have a height between 0.01 mm and 0.3 mm and a distance from one another between 2 mm and 7 mm. On the hob plate 12, a hotplate 15 is formed by a radiant heater 17 according to the invention arranged underneath, which corresponds to the prior art in terms of its basic structure. The radiant heater 17 has a receiving shell 19 made of sheet metal, which has a raised edge 20. In the middle there is a central small hole 21 with a diameter between 2 mm and 8 mm.

A carrier 23 is inserted into the receiving shell 19, which advantageously consists of conventional material and is essentially designed like a plate. The carrier 23 has an upper side 24 on which heating elements 31 of known design run. The corresponding laying pattern for the heating elements 31 can be seen from FIG. The carrier 23 has an outer edge 27. Within this edge 27, the carrier 23 has a known wide shoulder onto which a ring-like edge body 29 is placed. This protrudes slightly above the edge 20 of the receiving tray 19. The radiant heater 17 rests with the top of this edge body 29 on the underside 13 of the hob plate 12. In a manner not shown, which the person skilled in the art knows from the prior art, the radiant heater 17 is pressed with a certain force against the underside 13 by means of this edge body 29 and lies against it.

While conventional radiant heaters often have so-called rod controllers as temperature detection devices, possibly also alternatively designed temperature sensors, the radiant heater 17 according to the invention has a temperature detection device 33 according to the invention. It is arranged in the middle, in particular above the central bore 21. The temperature detection device 33 has a thermal sensor as a temperature sensor. element 35, as is basically known from the prior art. Such a thermocouple can be easily found from known thermocouples. It must be designed to withstand high temperatures, possibly permanently, especially temperatures above 500°C up to 600°C or even up to 700°C. The thermocouple is designed in a manner known per se as a welding point or welding of two connections 36a and 36b in the form of wires which consist of correspondingly different materials. It is therefore important that the thermocouple 35 is arranged in the highest region of the temperature detection device 33, and advantageously even forms this highest region itself. It is arranged on a holder 40, which can consist of ceramic, advantageously steatite. The holder 40 has a tapered or pointed end 41 in the uppermost area. Its design can be seen from FIG. 4 with four inclined surfaces offset by 90° each. Two longitudinal bores 43a and 43b run through the holder 40, with one connection 36a and 36b being guided through one of these longitudinal bores 43a and 43b. The connections 36a and 36b can be twisted directly underneath for fastening. At the bottom, the connections 36a and 36b merge into a connecting line 37 that runs out. This allows the thermocouple 35 to be electrically connected to an evaluation. Such an evaluation advantageously corresponds to what is known from the prior art. Either it can be connected to a hob control with a microcontroller, which uses the temperature signals as a recorded temperature and uses them to set the power for the radiant heater 17. Alternatively, a power specification for the radiant heater 17 can be generated by means of a so-called energy regulator, i.e. a thermoelectromechanical system. Here it is advantageously conceivable to implement an attachment device which is attached to the energy regulator and additionally controls it, in particular reducing a power specification or setting it to zero when the thermocouple 35 detects a temperature that is specified as being too high.

The holder 40 has a cylindrical cross section and therefore also a cylindrical outer shape, in particular a circular outer shape. This can possibly also be seen from the enlarged sectional view of FIG. 3 together with the oblique view of FIG. 4. Furthermore, it can be seen that the holder 40 is arranged in a receiving sleeve 45, specifically in an inner bore 46 provided there, in such a way that it is longitudinally movable. The two cross sections correspond to each other, the inner bore 46 is approximately 5% larger than an outer cross section of the holder 40. The receiving sleeve 45 advantageously also consists either of ceramic such as steatite, i.e. corresponding to the holder 40. Alternatively, it can be made of an aforementioned material such as vermiculite consist. The inner bore 46 is provided with the same cross section throughout. The receiving sleeve 45 is inserted into an opening 26 in the carrier 23, so firmly that it is not additionally fixed must and cannot tilt or the like. This opening 26 is located exactly in the middle or centrally above the bore 21 in the receiving shell 19. The connecting line 37 of the thermocouple 35 can therefore be led out of the receiving shell 19 through the bore 21.

Before the holder 40 with the thermocouple 35 is inserted as a prefabricated structural unit into the inner bore 46 of the receiving sleeve 45, a coil spring 48 is inserted. This coil spring 48 has an outer diameter that is only slightly, in particular 2% to 15%, below the cross section of the inner bore 46. The coil spring 48 is thus reliably guided in the inner bore 46. At the same time, its diameter is larger than that of the bore 21, so that the coil spring 48 rests or is supported downwards on the edge region of the bottom of the receiving shell 19 surrounding the bore 21. The holder 40 is in turn placed on the coil spring 48 and is supported with its underside on the coil spring 48. This achieves the resilient mounting of the holder 40 on the temperature detection device 33 or in the receiving sleeve 45. This resilient mounting is important so that, given component tolerances in the construction of the radiant heater 17 and its arrangement below the hob plate 12, a safe, reliable and permanent contact of the thermocouple 35 on the underside 13 is always guaranteed. Furthermore, this is advantageous or necessary for the drop test for the hob 11 known from the prior art.

The coil spring 48 can basically be made of any material, it could also be designed as a leaf spring or with any other construction, it just has to be able to push the holder 40 with the thermocouple 35 at its tip upwards. However, due to the very high temperatures that prevail even within the receiving sleeve 45, especially during continuous operation of the radiant heater 17 or the heating elements 31, a high temperature resistance is necessary. These temperatures can reach several 100°C over time, for example 400°C to 600°C. It is therefore important that the spring used does not lose its spring properties and/or its shape over time. High-quality spring steels are ideal for this.

The thermocouple is advantageously of type J or type K. It has a diameter between 0.25 and 0.3 mm, but can also be smaller or larger.

The temperature detection device 33 does not necessarily have to be arranged in the middle of the radiant heater 17; it can also be arranged closer to the edge 27. A strip-like free area 32 in the course of the heating elements is suitable here, for example 31, which can be clearly seen from Fig. 2. Arranging the temperature detection device 33 further towards the edge 27 could have the general advantage that a pot placed on the hob 15 is more likely to rest in this edge area and thus absorbs more heat from the hob plate 12. This in turn can lead to lower temperatures on the underside 13 of the hob plate 12, so that the hob plate 12 is subjected to less thermal stress.

The radiant heater 17 is clearly a so-called single-circuit radiant heater. The only temperature detection device 33 is provided for this single heating circuit and must then be positioned advantageously. If the radiant heater is designed as a dual-circuit radiant heater, i.e. it has several heating circuits that can be operated independently of one another, a separate temperature detection device 33 can be provided for each independently operable heating circuit, but advantageously only a single one in total. This is shown below in FIG. 8 and described accordingly.

From the enlarged sectional view of FIG. 3 it can be seen that, on the one hand, there is a risk that the holder 40 together with the thermocouple 35 will slip upwards out of the receiving sleeve 45. However, this can either be prevented by a positive design. Alternatively, this can prevent the connecting line 37 from yielding to such an extent that slipping out is possible. Furthermore, when the radiant heater 17 is installed, i.e. in a hob 11, this risk no longer exists. So it only needs to be taken into account during production, transport and assembly. In a generally advantageous embodiment of the invention, a transport safety device can be provided for the temperature detection device 33 or the thermocouple 35. This is intended to protect the same and to press the thermocouple 33 down in the receiving sleeve 45. Thus, the thermocouple 35 and the transport lock should not protrude upwards beyond the peripheral edge body 29 of the radiant heater 17 in order to prevent damage during transport and assembly. Such a transport lock can generally be formed by a cap that sits firmly or clamps on the receiving sleeve 45, advantageously made of plastic. Alternatively, a bayonet lock could be provided between the holder 40 and the receiving sleeve 45, which can be locked and released again by a rotational movement through a certain angle of rotation.

The thermocouple 35 is held on the holder 40, in particular exactly in the predetermined position at the pointed end 41, in that the two connections 36a and 36b, which are guided separately through the longitudinal bores 43a and 43b, are advantageously below the holder 40 are twisted together, in particular directly below the holder 40. This ensures that the thermocouple 35 is secured in position, which is also very important.

A modification of a radiant heater 117 according to the invention is shown in FIG. A hob plate is not shown here, but a holder 140 of a temperature detection device 133 is pushed further out of the receiving sleeve 145 due to the spring force of a coil spring 148. Compared to the height of the circumferential edge body 29, which means the level of the underside of the hob plate according to FIG. 1, it can be seen that such a projection can be a few millimeters, for example 1 mm to 4 mm.

The radiant heater 117 has, as shown in FIG. 1, a receiving shell 119 including an edge 120 and a central bore 121. An identical carrier 123 with an upper side 124 on which heating elements 131 run is inserted into this receiving shell 119. The receiving sleeve 145 mentioned is inserted and fastened into a central opening 126, which lies exactly above the bore 121. Holder 140 and receiving sleeve 145 are made of the same material as described above. However, the holder 140 is clearly designed differently at its uppermost area, namely it does not have a pointed end. The thermocouple is also designed differently here, namely it has a heat distribution disk 42 made of steel or nickel welded onto it. This runs parallel to the surface of the top of the radiant heater 117 or to the surface of the underside of a hob plate after installation in a corresponding hob. The heat distribution disk 42 can be made of appropriately temperature-resistant metal, its diameter can be 5 mm to 6 mm, and the thickness can be between 0.1 mm and 0.3 mm. This heat distribution disk 42 has the advantage that it is so large that it rests on the underside of only the initially mentioned knobs on the underside of a hob plate, i.e. it always rests. The same transfer conditions for a temperature are therefore always present, while the thermocouple 35 of FIGS. 1 to 4, which is more likely to be seen as a point, can sometimes rest on such a nub and sometimes next to it. Furthermore, the heat distribution disk 42 also forms the aforementioned impact protection for the underside of the hob plate.

It can also be seen that the diameter of the heat distribution disk 142 is not larger than that of the holder 140. This means that it is exposed to and heated up less by direct radiant heat from the heating elements 131. Finally, if possible, the thermocouple 135 should only detect the temperature of the underside of the hob plate.

In such an embodiment with a metallic heat distribution disk 142, there is the option that the free ends of the connections 136a and 136b of a connection line 137 for the thermocouple 135 are not directly welded together to form this thermocouple. Rather, they can also be welded to the common heat distribution disk 142 at a distance of 1 mm to 2 mm from one another. Then the thermocouple is formed together with the heat distribution disk 142, so that the necessary choice of material should be made with regard to a desired thermal voltage.

8 shows a further radiant heater according to the invention as a dual-circuit radiant heater 217 in a top view. It has an edge 220 of a receiving shell 219, which contains a round disc-shaped carrier 223. The dual-circuit radiant heater 217 has a smaller, so to speak inner heating zone 230a with an inner heating element 231a on the carrier 223. This is designed as described above and as is known from the prior art. It runs similarly to FIG. 2 in a well-known meandering pattern. Furthermore, a larger, crescent-shaped and, so to speak, outer heating zone 230b is provided with an outer heating element 231b, in which the round inner heating zone 230a is arranged, but shifted completely to its edge. The heating zones 230a and 230b are therefore not arranged concentrically, as is often the case with dual-circuit radiant heaters.

A temperature detection device 233 is arranged in the edge region in which the inner heating zone 230a is arranged near the edge 220. This means that it is always below the edge area of a pot that is placed on a hob plate above the radiant heater 217, regardless of whether the pot is small corresponding to the inner heating zone 230a and is only heated by it, or whether the pot is large corresponding to the outer heating zone 230b and is heated together by both heating zones 230a and 230b. This means that only a single temperature detection device 233 is required for two heating zones, which reduces the effort. At the same time, the arrangement of the temperature detection device 233 in this edge area may be very advantageous because this means that a temperature is always measured on the underside of the hob plate in a place where both good and bad pots always rest, namely on its edge area.

The temperature detection device 233 has a receiving sleeve 245. A heat distribution disk 242 can also be seen, which is welded to the top of an invisible thermocouple as described above.

Near the temperature detection device 233, an electrical connection 218 is provided on the outside of the edge 220 of the receiving shell, which can be designed as usual. The heating elements 231a and 231b can be connected to it. In addition, this could be the case An electrical connection option for the temperature detection device 233 can also be provided on the right plug.

Claims

Patent claims Radiant heater for a hob for arrangement under a hob plate of the hob, the radiant heater having: a carrier with an edge surrounding the carrier, a heating element on the carrier, a temperature detection device on the carrier, which is designed to detect a temperature on the underside of the hob plate is, characterized in that the temperature detection device has: a thermocouple which is arranged on an uppermost region of the temperature detection device and/or rests on the underside of the hob plate, a holder for the thermocouple, the holder being designed to be electrically insulating, a spring device which is designed to resiliently press at least the thermocouple away from the carrier in the direction perpendicular to the surface of the carrier and over the carrier towards the hob plate. Radiant heater according to claim 1, characterized in that the temperature detection device, in particular the holder for the thermocouple, is tapered at the top region, in particular tapered conically. Radiant heater according to claim 1 or 2, characterized in that the thermocouple projects upwards beyond the holder, in particular with a projection of at least 0.1 mm, preferably up to a maximum of 2 mm. Radiant heater according to one of the preceding claims, characterized in that a heat distribution element is arranged on top of the thermocouple, the heat distribution element having a surface that is larger than that of the thermocouple, preferably the surface of the heat distribution element being flat on its top side and/or parallel runs to the surface of the carrier, in particular the heat distribution element being made of metal and preferably being welded onto the thermocouple. Radiant heater according to claim 4, characterized in that the area of the heat distribution element is between 2 mm ² and 200 mm ² , preferably between 8 mm ² and 100 mm ² . Radiant heater according to one of the preceding claims, characterized in that the holder has a holding body to which the thermocouple is attached directly, preferably by means of connections of the thermocouple, the holding body being formed from a material from the following group: ceramic, vermiculite, verdomite. Radiant heater according to one of the preceding claims, characterized in that the holder is arranged in a receiving device surrounding the holder and the holder and the receiving device are designed such that the receiving device is fixedly arranged on the carrier, in particular engages in the carrier, the holder can be moved in the direction perpendicular to the surface of the carrier in the receiving device against the spring device, the spring device preferably being arranged within the receiving device and below the holder, in particular the spring device being a compression spring. Radiant heater according to claim 7, characterized in that the receiving device is made of a material from the following group: ceramic, vermiculite, verdomite, and / or that the receiving device is an elongated sleeve with an inner cross section that corresponds to and opposite the outer cross section of the holder External cross section is increased between 2% and 20%. Radiant heater according to one of the preceding claims, characterized in that the radiant heater has a receiving shell for the carrier, on which the carrier flies essentially flat, the receiving shell having a hole in the area of the temperature detection device and the carrier having a larger opening, the opening covers this hole. Radiant heater according to claim 9 and according to claim 7 or 8, characterized in that the receiving device has a longitudinal opening with the internal cross section, the receiving device being inserted into the opening with a precise fit and the bore in the receiving shell sitting below the longitudinal opening of the receiving device, preferably the spring device according to claim 7 is supported on an edge of the bore of the receiving shell running within the longitudinal opening. Radiant heater according to one of the preceding claims, characterized in that the holder has two longitudinal bores next to each other, the two Connections of the thermocouple each run separately from one another in the longitudinal bores through the holder and exit at its lower end, whereby they are preferably led downwards through the receiving device and the bore in the receiving shell, in particular the longitudinal bores of the holder up to the uppermost region of the holder go, the longitudinal bores preferably being arranged and designed point-symmetrically to a longitudinal central axis of the holder. Radiant heater according to one of the preceding claims, characterized in that the holder with the spring device is designed such that the thermocouple, preferably with a heat distribution element according to one of claims 4 or 5, is between 1 mm and 4 mm above the highest in the unloaded state of the spring Point of the other radiant heater or the carrier, preferably also the edge that surrounds the carrier, protrudes upwards. Radiant heater according to one of the preceding claims, characterized by a transport lock for the temperature detection device or the thermocouple in order to hold or press the thermocouple downwards in the receiving sleeve, preferably so that the thermocouple and the transport lock do not protrude upwards over the surrounding edge of the radiant heater . Radiant heater according to one of the preceding claims, characterized in that the radiant heater does not have a rod controller or a thermomechanical temperature detection device and / or that the radiant heater has a single temperature detection device or a single thermocouple. Hob with a hob plate and with at least one radiant heater arranged underneath according to one of the preceding claims, wherein the thermocouple is pressed against an underside of the hob plate.