CS252861B1 - Microwave heating device - Google Patents

Abstract

A device for microwave heating of materials with planar surface areas, the thickness of which is comparable to the wavelength of the wave in the material, consisting of microwave energy generators, a radiation channel, the axis of the waveguides being aligned with the axis of the radiation channel and, for ceramic materials, an angle of from 60° to 85° so that its tangent is given by the relative index of the radiation of the material to the surrounding environment.

Description

The invention provides a device for microwave heating of materials with planar surfaces.

The microwave and white-heater devices used so far mostly operate in multipoint mode. Such a mode is suitable for the irregular shape of the dried material. For thin films, the thickness of which is considerably smaller than the wavelength, the normal impact of the plane wave is used. When drying layers whose thickness is comparable to the length of wool in the material! ·, Both mesh modes are disadvantageous, since they also produce a vibration-reflective effect, thereby increasing losses and radiating to the surrounding space.

These drawbacks are overcome by the microwave heating device, which is based on the fact that the axes of the waveguides clamp with the axis of the irradiation channel for ceramic materials from 60 ° to 85 ° so that its tangent is given by the relative index. refraction of irradiated material towards the surrounding environment.

On connected! The drawing shows a diagram of a micro wave heating device. The apparatus for microwave heating for drying materials with planar surface areas (fig.) Consists of microwaves energy generators 1, waveguides 2 with sliding pistons 3 and irradiating oukahal 4. The axis of the waveguide 2 is an animal with an axis of irradiation 4 for size from 60 ° to 85 °. The planar surface material 5 is positioned along the irradiation channel 4.

The radiation and radiation channel in the device according to the invention makes it possible to apply to the material a plane polarized wave at an angle which ensures a minimum reflection. The choice is subordinate to the dieleictric properties of the material and can be adjusted as needed. Such an arrangement improves the conditions of energy dissipation from the radiation generators, since the undesired reactant component formed by reflections of the electromagnetic guilt of the material and shadows is eliminated. In this way, a reflection reduction of up to 50% compared to the normal impact can be achieved, thereby reducing the energy loss in the radiation space and reducing the possibility of radiating into the surrounding space.

Drying of solid bricks with a moisture content of 22 - 24% with a depth of 7 cm, a roof covering with a moisture content of 17%, a thickness of 2 cm and tiles with a moisture content of 6 ° / o were verified. In all these cases, the surfaces hurt close to the planar surfaces, allowing the installation of an optimum impact angle. The alignment of the generators was reached and the radiation field was close to homogeneous. When varying the efficiency of coinveirs from material heating and evaporation, 95-97% of RF energy utilization was detected.

The invention can be used wherever microwave energy is introduced into a material with planar surface areas, where the torque of the material is comparable to the wavelength in the material.

Claims (1)

Microwave heating devices mate with the axis of the irradiation channel (4j for hunting with planar surface surfaces of ceramic materials angle of 60 ° to 85 °, so as obtained from microwave energy generators that its tangent is given by relative indegia, waveguides and irradiation. This is due to the refraction of the irradiated material with respect to the emanating environment of the waveguide axes (2) in a tilting environment.