Electric heating – Microwave heating – With control system
Patent
1996-10-29
1998-06-16
Leung, Philip H.
Electric heating
Microwave heating
With control system
219702, 219739, 219686, 219757, H05B 668
Patent
active
057674930
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a device for the treatment of materials; and more particularly, it concerns a novel device having a heating chamber which is selectively opened and closed by a door.
DESCRIPTION OF THE RELATED ART
Devices of this kind are employed for initiating, promoting and/or carrying through chemical or physical processes in materials and/or for the preparation of materials in each case with relatively great heating and/or simply for the heating of materials for various purposes.
Thereby, there may be involved measures for separation of materials and/or preparation of materials in particular for the purpose of analysis and/or for the preparation of materials, e.g. heating or baking of foodstuffs for consumption.
With the above-described measures, because of the effect of the heat and evaporation of the material to be heated or of components of the material there is a pressure increase in the heating chamber which in particular in the case of a large volume heating chamber and a large area closure element can lead to an overloading and thus damaging of the parts retaining the closure element in its closure position. With a pressure increase in the heating chamber of only about 0.5 bar, there is in the case of a charging aperture of about 40 cm.times.40 cm a pressure loading of 800 kg on the inner surface of the closure element. Conventional mounting constructions for the closure element are not designed for such a loading. Such a design would also make more difficult the integration of the mounting elements and further lead to a disadvantageous and costly construction.
The above-described problems are present both when the material is treated in special closable sample containers or is treated directly in the heating chamber. In the first case, because of the pressure increase, there often occurs a bursting or exploding of the sample container or containers, whereby the pressure propagates into the heating chamber and places this likewise under pressure. In such devices or treatments in which the material to be treated is placed directly into the heating chamber, the latter is directly set under pressure.
The above-described problems occur with devices of the present kind in the case both of commercial use and also domestic use. An example of a domestically useable device is e.g. a domestic microwave oven which likewise suffers the above-described disadvantages and is also at risk for the above-mentioned reasons.
SUMMARY OF THE INVENTION
The object of the invention is to protect a device of the kind indicated in the introduction from an overloading resulting from a damaging internal pressure.
All solutions in accordance with the invention contribute to the protection of the device from overloading and thus contribute to a protection from explosions.
According to one aspect of this invention, there is provided a device for the treatment of materials under the action of heat, and if appropriate, also pressure, in a heating chamber. The device is formed with a charging aperture which opens into the heating chamber; and this aperture can be selectively opened and closed by means of a door which normally presses against a frame around the aperture. A heating device, such as a microwave generator, is provided for the heating chamber. The door is so mounted that upon a particular pressure in the heating chamber being exceeded, the door lifts off from the frame and moves to a relief-opened position; and, after the reduction of pressure, the door can be moved back into the original position either automatically or by the application of force.
With the above described configuration in accordance with the invention, an overpressure in the heating chamber is automatically released, so that overloading cannot arise. The door, standing in its relief position, can thereby fulfil a monitoring or indicating function from which it is apparent to the operating person that an overpressure was present.
Thereby, a maximum loading of the device or of the do
REFERENCES:
patent: 1944156 (1934-01-01), Feltham
patent: 2620509 (1952-12-01), Keating
patent: 3816688 (1974-06-01), Fritts
patent: 3943319 (1976-03-01), Hirai et al.
patent: 4327241 (1982-04-01), Obenchain
patent: 4454686 (1984-06-01), Stapenell
patent: 5029533 (1991-07-01), Hengelmolen
Leung Philip H.
Milestone Inc.
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