Patent ID: 8250974
Filing Date: 2012-08-28
Classification: A23C,A23L,H05B

Abstract:
1. An apparatus for applying oscillating magnetic fields, particularly for treating a liquid, pasty, semi-solid or granular product, comprising: at least one pipe conveying the product to be treated, said pipe having an inner surface in contact with the product and a substantially cylindrical outer surface; at least one series of electrodes located around the outer surface of said at least one pipe, each of said electrodes having a substantially annular shape and an inner surface with at least one substantially conical edge having a predetermined conicity angle; and a generator of high-frequency oscillating voltage, the generator having a negative terminal and a positive terminal electrically connected to said at least one series of electrodes to generate an electromagnetic field therebetween, wherein each pipe comprises an electrically insulating material to prevent passage of current to the product, said high-frequency oscillating voltage being in the range of radio-frequency, said inner surface of each said electrode being out of contact with the product to be treated and having a minimum radial air distance from the outer cylindrical surface of said at least one pipe which is sufficient to prevent electric currents from passing to the product to be treated, during operation, and which is further sufficient to heat the product exclusively via oscillation of product molecules about their equilibrium points induced by said oscillating electromagnetic field, and wherein each pair of longitudinally adjacent electrodes has facing conical edges with opposed conicity angles and is connected to terminals of said generator having opposite signs to induce electromagnetic field lines substantially parallel to a longitudinal axis of the pipe and to allow use of high-frequency currents with no risk of discharges to air.