FR2571479A1 - Microwave water heater - Google Patents

Abstract

The object of the invention is to heat a heat transfer fluid intended for heating "and, or" for domestic use of this fluid. This fluid is brought up to temperature by a wave generator, similar to that of ovens. It is placed in a "chest" 8 closed by a flap 9. The vessel is a "sandwich" composed, on the inside, of a plastic covering 1, on the outside of an enamelled steel wall 2 and, in the middle, of an insulant 3. A manometer 4 controls the pressure. Two pipes provide the inlet 5 and evacuation 6 of the fluid. A catalyst 7 removes any risk of scaling.

Description

 The invention described below is a temperature miscellaneous process for a peddling fluid (boiler) connected to a network: - central heating; and, or sanitary water.

Operation is based on the principle of microwave ovens, the only difference comes from the body heated by the meter:
- for ovens, air
- For the present invention, the fluid will be water.

This water heater is divided into two main parts: - the enclosure,
- the wave emission device.

The enclosure forms a tank which can accommodate, depending on the use made of the water heater, 50 to 600 liters of water.

The interior facing (1) is a material permeable to microwaves, such as a plastic material, and in a preferred embodiment. The metallic outer wall (2) acts as a faraday cage. Since plastic is not a sufficient barrier to the propagation of emitted waves, only a metal screen can meet this requirement. Preferably, an enamelled steel or a lacquered steel will be used.

Between the two screens, a complex of metal filings foam (3) slows down the heat flow to the outside generated by the water.

The complex may advantageously consist of a polyurethane foam and iron filings.

At the top of the tank a pressure gauge (4) controls the pressure inside the tank. The cold or preheated water supply (5) is made at the base. This water can come from the distribution network or from another connection, for example: coupling to a solar heating.

The hot water drain pipe (6) is connected; at the start, with a catalyst (7) practically eliminating any risk of scaling. The wave generator is placed in a cavity (8) separated from the heat transfer fluid by a polyamide 6 or similar (1) which is waterproof and permeable to waves.

Inside this cavity is installed the transmitter and an electric variator which allows an adjustment of the power from O to 800 watts.

 A hatch (9) of the same composition as the tank, protects everything from the outside.

Figure 1 shows a section of the invention.

The present invention has the advantage of ensuring a saving of 30 to 50 O / o of electricity, a high speed of heating of the fluid, an easy use.

Its installation is easy due to its lightness, its ability to be placed horizontally or vertically.

The water heater according to the invention can advantageously replace wall-mounted domestic water heaters, in particular water heaters fitted to kitchens as well as wood boilers, coal fired with liquid fuels; gas and electric.

Claims (2)

1) Microwave water heater characterized in that the enclosure is constituted, externally by a metal wall (2) serving as a microwave screen, and, internally by a wall (1) permeable to said micro- waves, and in that the microwave generator is housed in a cavity (8) between the two walls. 2) Microwave water heater according to claim 1, is characterized in that the insulator (3) inserted between the two walls consists of a complex of foam and metal filings.