Electric heating – Microwave heating – Enclosed cavity structure
Patent
1993-06-10
1995-06-13
Leung, Philip H.
Electric heating
Microwave heating
Enclosed cavity structure
219681, 219717, H05B 664
Patent
active
054245184
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
Many products have to be dried after some treatment. For this hot air, infra-red radiation and lately microwave energy has been used. This treatment is usually performed in especially built rooms or volumes. With a permanent built in equipment those rooms will become more or less complicated as they have been designed for a specific use. The object of the present invention is to present a device, that is easy to move between different rooms for treatment and at the same time consumes as little energy as possible.
BACKGROUND ART
Airhandling has been well known a long time. Heating of air is also well known. Recently different kinds of treatment with microwave energy have come in use. Firstly those equipments were designed for a certain technical function or room.
The present invention start from some of those known technical solutions and presents a low cost device for the generation of energy, where microwave energy as well as warm air is used. Those two kinds of energy are combined in an electrically ideal way.
SUMMARY OF INVENTION
It is especially characteristic for the invention that microwave energy and cooling air from its generation cooperate in a cavity, where microwave energy is the predominant kind of energy to be used for some operation like drying of paint or glue.
Known transmitters of microwave energy consume comparatively much power. A highly developed cooling is therefore needed. It is characteristic for the invention that the device has one or more fans for air transport past microwave transmitters. This characteristic is enlarged with the need of air for transport of aqueous vapour from the treated objects. Typical for the device is, that the fans are designed to match this need of watertransport in a way that for cooling much oversized fans will be used, where the evaporation of water is large.
An other distinctive mark is, that the whole device can be manufactured to a complete working unit, which furnish microwave energy as well as heated cooling air. All needed equipment for the time and humidity control can be found installed. This means that it will be easy to move the device for operation from one cavity to another, which means great economical advantage.
Normally electric motors are run on three-phase current, induction motors. In order to avoid an unbalanced line load, the most advantageous device consists of three microwave transmitters so connected to the fan motor that a totally balanced load will be obtained. With three suitably connected transmitters low mutual disturbance will occur.
An other characteristic for the invention is that due to standardization to rather small outputs, a massproduction and use of the invented device will result in, that the number of devices and not the their output will become design quantity.
BRIEF DESCRIPTION OF DRAWINGS
A typical example of the invented device is shown schematically in perspective from above in FIG. 1 and turned over in FIG. 2. FIG. 3 shows very schematically the outer contours of a microwave transmitter with its microwave-guide or antenna installed. In FIG. 4 the cover of the device is taken away, and it is possible to look into it. FIG. 5 shows a modification of the device. Finally FIGS. 6a, 6b, 6c and 6d show the invented device in a realistic mode of use.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an ordinary design of the invented device. One sees a long narrow box 1, which has flanges 2 in the bottom, and a cover 3. In the cover there is a hole 4. If the box, that is shown schematically in perspective in FIG. 2, is turned over, three netting covered holes 5 and three protruding pipes 6 with rectangular cross section will be seen. The latter are the mouths of the microwave transmitter's wave-guides.
In FIG. 3 the outer contour of a typical microwave transmitter is shown. Skilled men know, that usually a magnetron is the source of the microwave energy. Normally it is surrounded by cooling flanges 7, which in the figure is shown schematically as thin lines. There should be a driving comp
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