Electric resistance heating devices – Heating devices – Tank or container type liquid heater
Patent
1997-06-19
2000-05-30
Walberg, Teresa
Electric resistance heating devices
Heating devices
Tank or container type liquid heater
392442, 392447, 99282, 99283, 99296, F24H 118
Patent
active
060699965
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for heating a drinkable liquid, having a liquid-storage container and an electric heating element arranged therein, the liquid-storage container having a valve which is arranged at the bottom in the base of the liquid-storage container and of which one sealing surface is the border of an opening in the base and which opens, in a manner which cannot automatically be reversed, on account of the base curving outwards at a predetermined internal pressure in the container, and the power supply to the heating element being designed such that it is interrupted when the pressure in the liquid-storage container is essentially equal to the atmospheric pressure, which device can be positioned on a collecting container for the liquid.
A known device of this type (EP-A-0479111) is predominantly used in vehicles, in motion, for making hot drinks or, for example, also soup. The device filled with a drinkable liquid, in particular water, and a collecting container are carried for this purpose. If one wishes to have a hot drink or soup, then the device is positioned on the collecting container and connected to an electric power source. The liquid is then heated and expands, the internal pressure being increased further by the expansion of the liquid, by gases which may be located in the storage container or by gases contained in the liquid. When a certain overpressure is reached, then the valve opens irreversibly, and the hot liquid flows into the collecting container. A drink or soup which has been introduced beforehand into the collecting container in the form of a dry substance or has been provided at the bottom of the liquid container, for example in a suitable liquid permeable receptacle, is made in the process. The device is then removed, and the liquid can be drunk from the collecting container or else, in the case of soup, spooned therefrom. It is also known that the device can be reused and refilled with liquid by the user and made ready for use.
The device is straightforward, expedient as well as safe. This is because, at the moment when the liquid has emptied into the collecting container and overpressure can no longer prevail in the liquid-storage container, the power supply is interrupted, with the result that the heating element cannot be heated any further.
The previously known device has the disadvantage, on the one hand, that the throughflow area of the valve is comparatively small. Moreover, when the valve opens, there is friction between the lip seal and the annular border of the base opening, which, in some circumstances, prevents reliable opening of the valve.
The object of the invention is to provide a device of the type mentioned in the introduction having a valve which operates safely and reliably and has a large throughflow cross section. In many cases, the advantage of the large throughflow cross section is that the drinks are made more uniformly.
The solution according to the invention consists in that the other sealing surface of the valve is a plate-like element which consists of an elastic material and, in its non-loaded state, is shaped essentially conically, with the cone tip directed towards the interior of the liquid-storage container, and is retained at this tip.
As with the previously known valve, one sealing surface of the valve is thus the border of the base opening. The other sealing surface, however, is a platelike element which consists of elastic material and, in its non-loaded state, is shaped such that it essentially assumes the shape of the surface of a cone. When the base is pressed inwards, then the border of the base opening comes to rest against this cone and presses the border of the plate-like element inwards, with the result that it rests in a prestressed sealing manner here, against the border of the opening. If the internal pressure increases and the base is pressed outwards, then first of all the plate-like element follows until the base springs outwards, in which case the connection between plate-like element and border of the base op
REFERENCES:
patent: 2856843 (1958-10-01), Miklas
patent: 5098062 (1992-03-01), Lungu
patent: 5259295 (1993-11-01), Timm
patent: 5287796 (1994-02-01), Timm
Lu Jiping
Walberg Teresa
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