METHOD OF AIR DISINFECTION USING BROADBAND MICROWAVE RADIATION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2024 - IPC A61L9/18 

FIELD: medical equipment.

SUBSTANCE: group of inventions relates to a device for air disinfection using microwave radiation and a method of air disinfection using microwave radiation. The device consists of a chamber for interaction of air flow with microwave radiation, made in the form of a rectangular metal waveguide, containing at one end a wedge-shaped absorber of microwave radiation, made in the form of a matched load, at the other end — an exciting pin, which is a continuation of the central conductor of the coaxial line and part of the transition from coaxial line to a rectangular metal waveguide, cross-shaped directional coupler. The device includes a supply air duct and an exhaust air duct located at an angle to the chamber for interaction of the air flow with broadband microwave radiation. The device has a detector-measuring section containing an integrating device with a digital signal level meter, a data collection and control device, a broadband microwave radiation generator is connected to a rectangular metal waveguide, implemented on the basis of a white Gaussian noise microwave generator in frequency range 2÷12 GHz and microwave amplifier with adjustable gain. The device is configured to supply an air flow from the supply air duct by means of a controlled supply fan at an angle to the chamber of interaction of the air flow with microwave radiation through a hole at the exciting pin, cut in the wide wall of a rectangular metal waveguide containing a metal mesh diffuser, and to output the air flow through the hole at a wedge-shaped absorber in the opposite wide wall of a rectangular metal waveguide containing a metal mesh diffuser connected to an exhaust duct containing a digital anemometer and a controlled exhaust fan. The data collection and control device is designed to process information received from the detector-measuring section and digital anemometer, and set the power spectral density of the electromagnetic radiation flow

at the output of the microwave amplifier by adjusting the gain and setting the speed of the air flow blown through the interaction chamber with microwave radiation by adjusting the rotation speed of the controlled supply and exhaust fans. At the end of the rectangular metal waveguide on the side of the exciting pin there are wedges, the longitudinal dimensions of which at the point of connection of the coaxial line are selected from the condition , where is the length of the main wave in a rectangular metal waveguide, and the radius of the holes in metal mesh diffusers does not exceed

,

where is the minimum length of the fundamental wave in a rectangular metal waveguide, while

,

where is the minimum wavelength from frequency range of 2÷12 GHz, is the size of the wide wall of the rectangular metal waveguide, while the diameters of the metal mesh diffusers correspond to the diameters of the supply and exhaust air ducts and do not exceed the size of the wide wall of the rectangular metal waveguide. In the method, an air flow is supplied using a controlled supply fan through the supply air duct into the chamber for interaction of the air flow with microwave radiation, electromagnetic radiation is generated in the frequency range of 2÷12 GHz using a microwave white Gaussian noise generator. The method controls the spectral power density of the electromagnetic radiation flux

according to the level of recorded power using the detector-measuring section from the side channel of the cross-shaped directional coupler. In the method, a stream of disinfected air is discharged through an exhaust air duct using a controlled exhaust fan.

EFFECT: obtaining a method of air disinfection using broadband microwave radiation and a device for its implementation.

2 cl, 1 dwg