DE9305245U1 - Radiant heating for a transparent hob - Google Patents

Description

AKO-Werke GmbH & Co. KG Pfannerstrasse 75/79 7988 Wangen/Allgäu

Description

Radiant heating for a transparent hob

The invention relates to a radiant heater for a transparent cooktop with an electrical heating coil, the end region of which is connected to an electrical connection element at a welding point.

Such a heating coil is described in DE 36 40 999 C2. The heating coil is attached to a support with individual clamps. This method of attachment enables the use of a heating wire with a comparatively small diameter for the heating coil. This reduces the time that passes between the heating coil being switched on and it glowing. However, the increased wire temperature can lead to overheating of the welding points to which the heating coil is electrically connected. In addition, the end areas of the heating coil will also glow, which affects the glow pattern visible to the user.

The object of the invention is to suppress the visibility of the glowing end area in a radiant heating system of the type mentioned at the beginning and to avoid overheating of the welding point.

According to the invention, the above object is achieved in a

Radiant heating of the type mentioned at the beginning is achieved in that a component is arranged at the end region of the heating coil, which at least partially covers the end region from the cooking surface and is in heat-conducting contact with the welding point and/or the end region.

On the one hand, the component ensures that the end area, when it glows, is not so visible through the hob that it visually impairs the glow pattern of the heating coil. On the other hand, the heat-conducting connection of the component ensures that the weld point does not become so hot that there is a risk of it coming loose.

The device described has the advantage that the heating coil can be wound from a comparatively very thin heating wire, which glows quickly as desired during operation.

In a preferred embodiment, the component is a component wound from a heat-resistant wire through which the end region is inserted. Such a component is advantageous for protecting the weld point against overheating due to its comparatively large surface area and mass.

The component can also be a flat component, for example a leaflet, a strip in a flat or curved shape. The component can also be formed by a tube.

In order to be able to easily thread the component over the end area during assembly, it has an extension in a preferred embodiment of the invention.

The component can preferably be fixed at the welding point. It can have an appropriately designed end part for this purpose.

Further advantageous embodiments of the invention emerge from the following description of embodiments. In the drawings:

Figure 1 is a partial plan view of a radiant heater, Figure 2 is a section along the line 11 - 11 according to Fig.l, Figure 3 is a section along the line III-III according to Fig.l,

Figure 4 shows a wound component in a first embodiment,

Figure 5 shows a wound component in a second embodiment,

Figure 6a shows a wound component in a third embodiment in plan view,

Figure 6b the component according to Fig. 6a in side view,

Figure 7a shows a wound component in a fourth embodiment used in the embodiment according to Figures 1 to 4, in plan view,

Figure 7b shows the component according to Fig. 7a in side view.

A heating coil (2) is laid in a spiral on an insulating shell (1). The heating coil (2) is fixed to the insulating shell (1) using clamps (3). In two end areas (4), the heating wire of the heating coil (2) is pulled out smoothly and welded to connection elements (6, 7) at welding points (5). One connection element (6) is provided on a connection strip (8). The other connection element (7) is formed on a controller (9). The welding points^) or the connection elements (6, 7)

are located outside the insulating shell (1). The end areas (4) are guided under an insulating ring (10) approximately radially outwards to the welding points (5). The radiant heating described is arranged below a glass ceramic plate (not shown in detail).

The end areas (4) are passed through a spring-like wound component (ll). The component (ll) is wound on a block. Its windings are therefore in contact with one another. At the end facing the heating coil (2), the components (ll) have a funnel-shaped extension (C12). This makes it easier to insert the respective end area (4) of the heating coil (2) into the component (ll).

At the end near the connection element (6 or 7), the component (II) has an extended, non-wound end part (13) which is welded to the respective end area (4) of the heating coil (2) at the welding point (5). The wound component (II) is in a heat-conducting connection with the respective welding point (5) or the respective end area (4) of the heating coil (2). The component (II) consists of a heat-resistant wire.

The component (ll) largely covers the respective end area (4) in relation to the glass ceramic plate. This is achieved in that the glowing of the respective end area (4) through the glass ceramic plate is essentially not visible, at least not so far that the glow pattern of the heating coil (2) is significantly disturbed. The component (ll) assigned to the connection element (6) protrudes further towards the heating coil (2) than the component (ll) assigned to the connection element (7). This is based on the fact that the weld point (5) of the connection element (6) is closer to the insulating ring (10) than the weld point (5) of the connection element (7) and both components (ll) are the same length. However, components of different lengths (11) could also be used for the two end areas (4). The component (ll) assigned to the connection element (7)

The associated component (ll) in any case covers the end area (4) outside the insulating ring (10). This is important because a visible glow outside the insulating ring (10) could be perceived as a fault.

The components (ll) conduct heat generated during annealing of the end areas (4) away from the welds (5) so that there is no risk of the welds coming loose.

Figures 7a and 7b show the wound component (II) with the funnel-shaped extension (12) and the extended end region (13).

Figure 4 shows a wound component (ll) without a funnel-shaped extension and extended end area. This component can also be used for the end areas (4). It can be fixed to the respective end area (4) by clamping it, for example.

Figure 5 shows a wound component (II) with a funnel-shaped extension (12) without the extended end region (13). This can also be used for the end regions (4) in the manner described.

Figures 6a and 6b show a wound component (11) with an extended end region (13) without a funnel-shaped extension (12). This component can also be used in the manner described.

Claims (4)

Requirements Radiant heating for a transparent hob 1. Radiant heating for a transparent hob with an electric heating coil, the end area of which is connected to an electric connecting element at a weld point, characterized, that a component (11) is arranged at the end region (4) of the heating coil (2), which at least partially covers the end region (4) from the cooking surface and is in heat-conducting contact with the weld point (5) and/or the end region (4). 2. Radiant heating according to claim 1, characterized in that that the component (ll) is a component (ll) wound from a heat-resistant wire through which the end region (4) is inserted. 3. Radiant heating according to claim 1 or 2, characterized in that the component (ll) has an end part (13) which can be fixed at the welding point (5). 4. Radiant heating according to one of the preceding claims, characterized, that the component (ll) through which the end region (4) can be inserted has an extension (12).