RU2742111C1 - Uv bactericidal air irradiator-recirculator - Google Patents

Abstract

FIELD: medical equipment.

SUBSTANCE: invention relates to medical equipment and namely to an ultraviolet bactericidal air irradiator-recirculator. The invention has a body which contains an irradiation chamber. Its inner surface is covered with material that reflects ultraviolet radiation. The body of the invention also has a fan, a filter, an inlet window and an outlet window, absorbing airway labyrinth screens located near the inlet window and the outlet window. The invention’s body also has a source of ultraviolet bactericidal ozone-free radiation and a removable electrostatic dust collector. The inner surface of its body and the screens are covered with material that reflects ultraviolet radiation. An emission electrode is located inside the invention’s body in front of the output airway absorption screen on the inner surface of the body. The emission electrode is connected to ground or to the outside through a voltage source. The emission electrode and the absorbing airway labyrinth screens are made of material or coated with material chemically inert to atmospheric air substances. The electronic work function of the emission electrode material is less than 4.9 eV. The electronic work function of the labyrinth walls is less than or equal to 3.1 eV.

EFFECT: invention improves efficiency of disinfection and quality of the treated air by enriching the air with negative air ions of oxygen in the air. It also neutralizes harmful positively charged air ions.

10 cl, 4 dwg

Description

The technical field to which the invention relates.

The invention relates to medical equipment and equipment for air conditioning, purification and sterilization of air for the prevention and treatment of diseases in domestic, industrial and hospital conditions, namely, ultraviolet bactericidal irradiators-recirculators of air, including a housing in which an irradiation chamber is formed, internal the surface of which is covered with a material that reflects ultraviolet radiation, a fan, a filter and containing an entrance window and an exit window, absorption airway labyrinth screens located near the entrance window and exit window, a source of ultraviolet germicidal ozone-free radiation located in the body, a removable electrostatic dust collector and an emission electrode located along the inner surface of the housing in front of the outlet airway absorption labyrinth screen. The device can be effectively used to kill microorganisms, including coronaviruses.

State of the art.

A device for air disinfection is known from the prior art, comprising a housing with inlet and outlet windows, in which an irradiation chamber is formed, covered with a material that reflects ultraviolet radiation with placed bactericidal ozone-free ultraviolet lamps, provided at the inlet and outlet with labyrinth screens, a fan, a filter for cleaning general purpose air and an electrostatic filter (see the description of the patent for invention of the Russian Federation No. 2306150 C1, A61L 9/20, published in 2006). The main disadvantage of such a device is the scattering of ultraviolet radiation outside the housing, due to the design features of the labyrinth screens, the difficulty in servicing electrostatic filters and the absence of an air oxygen ionizer.

This device is the closest in technical essence to the claimed invention and is taken as a prototype to the proposed invention.

That is, the problem to be solved by the present invention is to improve the efficiency of disinfection and improve the quality of the treated air by enriching the air with negative air ions of oxygen in the air and neutralizing harmful positively charged air ions.

Disclosure of the invention.

Based on this original observation, the present invention mainly aims to provide an ultraviolet bactericidal irradiator-recirculator, including a housing in which an irradiation chamber is formed, the inner surface of which is coated with a material that reflects ultraviolet radiation, a fan, a filter, and containing an entrance window and an exit window, absorbing airway labyrinth screens located near the entrance window and exit window, a source of ultraviolet bactericidal ozone-free radiation located in the housing and a removable electrostatic dust collector, allowing at least to smooth out at least one of the above disadvantages, namely to provide an increase in efficiency disinfection and improvement of the quality of the treated air by enriching the air with negative air ions of oxygen in the air and neutralizing harmful positively charged light and heavy air ions in the air and purifying it from dust and spores, which is the set technical task.

To achieve this goal, the inner surface of the case is covered with a material that reflects ultraviolet radiation, and inside the case, in front of the output labyrinth screen, on the inner surface of the case, there is an emission electrode connected to ground or output to the external environment through a voltage source, while the emission electrode and absorption air ducts labyrinth screens are made of material or coated with a material chemically inert with respect to atmospheric air substances and having an electron work function of less than 4.9 eV for the emission electrode material and less than or equal to 3.1 eV for the coating of the labyrinth walls.

Thanks to such an advantageous characteristic, it becomes possible to increase the efficiency of disinfection and improve the quality of the treated air by enriching the air with negative air ions of oxygen in the air and neutralizing harmful, positively charged air ions. This is due to the fact that the principle of designing an effective bactericidal air recirculator follows from the well-known thesis that microorganisms belong to cumulative photobiological receivers, and, therefore, the bactericidal efficiency of air disinfection is proportional to the irradiation time and, ultimately, is determined by the radiation dose. In the present invention, this is achieved by multiple reflections of ultraviolet radiation from the inner surfaces of the chamber and labyrinth screens.

Bactericidal ozone-free ultraviolet lamps are made with a maximum of short-wave ultraviolet radiation at 253.7 nm, which corresponds to a light quantum energy of 4.9 eV, which are most effective in killing microorganisms and are equipped with a flask consisting of glass that filters out a spectral line of 185 nm, that is, quanta when interacting with which ozone is formed.

The difference between the built-in ionizer and analogs is that the emission of electrons is carried out mainly due to the photoelectric effect, and the negatively charged electrodes of the ionizer and the electrostatic dust collector are connected to the minus of the output of the direct current source, and the plus of the output of the constant current source is connected to ground or brought out into the external environment, and the electrode itself is made of a material or the surface of the electrode is covered with a material in which the electron work function is less than 4.9 eV, for example, titanium coated with titanium carbide. The electrodes can be made in the form of needle, wire, powder and other types of structures with a minimum radius of curvature of the surface, which can significantly reduce the work function of the electron. Emission electrodes must be chemically inert with respect to atmospheric substances. The use of such materials in the production of electrodes with an electron work function of less than 4.9 eV makes it possible to use the photoelectric effect and thereby significantly reduce the voltage of the direct current source used to ionize oxygen in the air, as well as reduce or eliminate air ozonation.

The work function of an electron in vacuum with the photoelectric effect is calculated by the formula:

,

,

- кинетическая энергия электрона.where hν is the energy of the quantum,

- kinetic energy of an electron.

For normal atmospheric conditions, hν can be less by the value of the electron affinity of the oxygen molecule, that is, by 0.45 eV. For example, hafnium carbide can already ionize at 1.6 eV in the affinity of emission electrons with an oxygen molecule, forming the necessary negative aero ions of atmospheric oxygen.

The difference between a removable electrostatic filter and analogs is that the emission of electrons from the negative electrode is carried out mainly due to the photoelectric effect and the implementation of the negative and collecting electrode of the filter. The negative electrode is made of a material or its surface is covered with a material whose electron work function is less than 4.9 eV, for example, titanium coated with titanium carbide, and the deposition positive electrodes are made of material or their surface is coated with a material whose electron work function is significantly more than 4.9 eV, for example, aluminum coated with Al₂O₃, with the work function of the electron (A_in) = 7.35 eV. For these values of Al₂O₃does not absorb, but reflects the maximum of radiation with a photon energy of 4.9 eV.

Emission electrodes must be chemically inert with respect to atmospheric substances. The use of such materials in the manufacture of electrodes makes it possible to use the photoelectric effect and thereby significantly reduce the voltage of the direct current source used for ionization and air filtration, as well as reduce or eliminate air ozonation.

The following substances satisfy these conditions:

1) Table 1 shows materials that are ionized only by ultraviolet radiation with the electron work function (A _in )> 3.1 eV. Precious metals and their coatings, which do not form oxide films under standard conditions, as well as graphite.

Table 1.

Material A _in (eV) Graphite 4.45-4.81 Gold 4.8 Osmium 4.55 Rhodium 4.75 Ruthenium 4.52 Silver 4.7

2) Table 2 shows metals with an oxide film.

Table 2.

Metals and their oxides A _in (eV) Molybdenum (Mo) 4.2 Molybdenum (VI) oxide (MoO ₃ ) 4.25 Boron (B) 4.6 Boron oxide (B ₂ O ₃ ) 4,3 Tungsten (W) 4.54 Tungsten (IV) oxide (WO ₂ ) 4.9 Silicon (Si) 3.59-4.15 Silicon (IV) oxide (SiO ₂ ) 4.9 Iron (Fe) 4.4-4.71 Iron oxide (FeO) 3.85 Titanium (Ti) 4.14-4.5 Titanium oxide (TiO) 2.96-3.1 Titanium (IV) oxide (TiO ₂ ) 4.7

3) Table 3. shows other materials that meet the requirement for materials in which A _{in is} greater than 3.1 eV and less than 4.9 eV.

Table 3.

Material A _in (eV) Chromium diboride (CrB ₂ ) 3.36 Molybdenum diboride (MoB ₂ ) 3.38 Manganese diboride (MnB ₂ ) 4.14 Titanium (II) boride (TiB ₂ ) 3.88-3.95 Vanadium diboride (VB ₂ ) 3.88-3.96 Zirconium diboride (ZrB ₂ ) 3.7 Niobium diboride (NbB ₂ ) 3.65 Titanium carbide (TiC) 2.35-3.35 Zirconium carbide (ZrC) 2.2-3.8 Titanium sulfide (TiS) 3.4 Silver (I) sulfide (Ag ₂ S) 3.8 Lanthanum tungsten (W + 2% La ₂ O ₃ ) <3.7 Zinc Oxide Silicon Alloy ≤ 3.2

4) Table 4. Shows inert chemical compounds that meet the requirement for A _at ≤ 3.1 eV.

Table 4.

Material A _in (eV) Hafnium carbide (HfC) 2.04 Scandium diboride (ScB ₂ ) 2.3-2.9 Niobium carbide (NbC) 2.24 Tantalum Carbide (TaC) 3.03-3.1 Titanium Carbide (TiC) 2.35-3.1 (Powdered) 2.35-3.1 Titanium oxide (TiO) 2.96-3.1 Tungsten diboride (WB ₂ ) 2.62 Zirconium carbide (ZrC) (powder) 2.2-3.05

There is also an embodiment of the invention in which the airway absorption screens, ionizer and electrostatic dust collector are connected to the housing and the irradiation chamber through insulators.

Thanks to this advantageous characteristic, it becomes possible to apply different voltages to the emission electrode and the electrostatic filter, which allows their independent voltage regulation.

There is another embodiment of the invention, in which the inner surface of the irradiation chamber and labyrinth screens is coated with aluminum.

Thanks to this advantageous characteristic, there is an alternative opportunity to use a cheap and affordable material with the required characteristics. Aluminum has a good ability to reflect ultraviolet radiation, due to the fact that Al ₂ O _{3 in} A = 7.35 eV, and the maximum photon energy of irradiation in the chamber is equal to 6.3 eV.

There is also such a variant of the invention, in which a material having an electron work function of less than 4.9 eV and more than 3.1 eV is selected as the emission coating material.

Thanks to such an advantageous characteristic, it becomes possible to effectively use radiation from a maximum of 4.9 eV to a minimum of 3.1 eV, depending on the material of the electrodes.

There is also a variant of the invention in which one of the following materials is selected as the coating material for the emission electrode: titanium, titanium carbide, manganese diboride, tantalum carbide, vanadium diboride, zirconium diboride, chromium diboride, niobium diboride, titanium sulfide, tungsten, zinc, boron , silicon, tantalum, gold, graphite, osmium, rhodium, ruthenium, silver, molybdenum, iron.

Due to this advantageous characteristic, it becomes possible to use materials with suitable characteristics, chemically inert, in some due to the formation of an oxide film: boron, silicon, tantalum, titanium, molybdenum, iron or coatings of gold, osmium, rhodium, ruthenium, silver, which do not form oxide films, as well as graphite, some borides, sulfides and carbides.

There is another variant of the invention, in which the material having the work function of the electron less than or equal to 3.1 eV is selected as the material for the coating of the emission electrode and the coating of the surface of the labyrinth walls.

Thanks to such an advantageous characteristic, there appears an alternative opportunity to maximize the use of the energy of ultraviolet radiation quanta for ionization, which decreases in the process of reflection and partial absorption. For example, for hafnium carbide from 4.9 eV to 2.04 eV, which corresponds to the orange part of the visible light spectrum.

In addition, there is a variant of the invention, in which one of the following materials is selected as the coating material for the emission electrode and the coating of the labyrinth walls: scandium diboride, niobium carbide, titanium carbide, titanium oxide, tungsten diboride, hafnium carbide. Since these materials absorb UV radiation as much as possible or convert it to the visible part of the spectrum.

These materials are the most suitable for covering the walls of labyrinths, since they convert the UV spectrum to the harmless visible part of the spectrum. Thanks to this advantageous characteristic, there is an alternative opportunity to use materials that are chemically inert, non-toxic, with proven characteristics, some of which are relatively cheap, for example, titanium carbide and tungsten diboride.

There is also such a variant of the invention, in which silver with deposited silver sulfide is selected as the coating material of the emission electrode, and the coating of the labyrinth walls is made of hafnium carbide.

Due to such characteristic advantageous alternative possibility appears to use the chemically stable and available materials that can be applied by electroplating to a cheaper metal, e.g., silver and form a film thereon of silver sulfide _with A = 3.8 eV, and hafnium carbide covers the labyrinth wall _with a = 2.04 eV, which enables most efficiently absorb radiation energy or transfer it into harmless visible light.

There is also a variant of the invention, in which titanium or another resistant metal coated with hafnium carbide is selected as the coating material for the emission electrode and labyrinth walls.

This advantageous characteristic provides an alternative opportunity for the most efficient emission of electrons from negative electrodes in comparison with other materials. The maximum absorption of radiation is carried out on the surface of the walls of the labyrinths.

There is also a variant of the invention, in which titanium or another resistant metal coated with titanium carbide is selected as the coating material for the emission electrode and labyrinth walls.

This advantageous feature provides an alternative opportunity to use relatively cheap materials that meet all the requirements.

The set of essential features of the proposed invention is unknown from the prior art for devices of a similar purpose, which allows us to conclude that the criterion of "novelty" is met for the invention.

Brief description of the drawings.

Other distinctive features and advantages of the invention clearly follow from the description given below by way of illustration and not limiting, with reference to the accompanying drawings, in which:

- figure 1 depicts the device of the irradiator-recirculator of ultraviolet bactericidal air, according to the invention,

- figure 2 depicts a diagram of connecting a device through a general-purpose electrical network, according to the invention

- figure 3 depicts a diagram of connecting a device through autonomous power supplies, according to the invention

- Figure 4 shows a connection diagram for an electrostatic dust collector according to the invention.

The figures indicate:

1 - case

2 - irradiation chamber

3 - entrance window

4 - exit window

5.1 - absorption airway labyrinth entrance screens

5.2 - absorption airway labyrinth exit screens

6 - a source of ultraviolet bactericidal ozone-free radiation

7 - fan

8 - filter

9 - removable electrostatic dust collector

10 - emission electrode

11 - insulators

12 - screws

13 - voltage regulator

14 - entire ionizer device

15 - collecting electrode,

16 - power supply unit.

According to figure 1, an ultraviolet bactericidal irradiator-recirculator includes a housing 1 in which an irradiation chamber 2 is formed, the inner surface of which is covered with a material that reflects ultraviolet radiation and contains an input window 3 and an output window 4, absorbing airway labyrinth screens 5.1 and 5.2, located near the entrance window 3 and the exit window 4, located in the housing, a source of ultraviolet bactericidal ozone-free radiation 6, a fan 7, a filter 8, a removable electrostatic dust collector 9.

The inner surface of the housing 1 is covered with a material that reflects ultraviolet radiation, and inside the housing 1 in the area of the exit window 4 along the inner surface of the housing there is an emission electrode 10 connected to ground or outlet to the external environment through a voltage source, while the emission electrode and absorbing airway labyrinth screens made of material or coated with a material chemically inert with respect to atmospheric air substances and having an electron work function of less than 4.9 eV for the coating of emission electrodes, and for the coating of the labyrinth walls is less than or equal to 3.1 eV.

The emission electrode 10 and the absorption airway labyrinth screens 5.1 and 5.2 can be connected to the housing 1 and the irradiation chamber 2 through the insulators 11.

The inner surface of the irradiation chamber can be coated with aluminum.

As a coating material for the emission electrode 10, a material having an electron work function of less than 4.9 eV and more than 3.1 eV is predominantly selected, and the material for the coating of the walls of mazes 5.1 and 5.2 has a work function of less than or equal to 3.1 eV.

As a coating material for the emission electrode 10, one of the following materials can be selected: titanium, titanium carbide, manganese diboride, tantalum carbide, vanadium diboride, zirconium diboride, chromium diboride, niobium diboride, titanium sulfide, tungsten, zinc, boron, silicon, tantalum , gold, graphite, osmium, rhodium, ruthenium, molybdenum, iron.

As the coating material for the emission electrode 10 and the coating material for the walls of the labyrinths 5.1 and 5.2, a material having an electron work function of less than or equal to 3.1 eV can be selected.

As a coating material for the emission electrode 10 and labyrinth walls, one of the following materials can be selected: scandium diboride, niobium carbide, titanium carbide, titanium oxide, tungsten diboride, hafnium carbide.

For regular maintenance, the housing 1 of the device is disassembled with screws. Figure 1 shows as 12.

Figures 2-4 show the wiring diagrams.

Implementation of the invention.

An ultraviolet bactericidal irradiator-recirculator works as follows. (A non-limiting example of the operation of the device is given).

Stage 1. The disinfected air taken from the room through the inlet window 3 is cleaned of dust in a general-purpose air purification filter 8.

Stage 2. Then he goes through the maze-air ducts 5.1.

Stage 3. It passes through a removable electrostatic filter 9, in which additional cleaning takes place.

Stage 4. Air enters the irradiation chamber 2, where it is disinfected under the action of the ultraviolet bactericidal radiation flux generated by the bactericidal ozone-free ultraviolet lamps 6.

Stage 5. The treated air passes through the ionizer formed by the emission electrode 10, where it is enriched with negative air ions of atmospheric oxygen

Stage 6. The purified air passes through the labyrinths-air ducts 5.2 and under the action of the fan 7 is directed into the room.

Labyrinths-air ducts of the input 5.1 and output 5.2 screens prevent the penetration of ultraviolet radiation into the room, which allows people to be in the room during air disinfection.

In the operating mode, you can increase the number of negative air oxygen ions in the air by connecting the output screen with labyrinths-air ducts to the negative electrode of the current source of the ionizer, which will allow the coating of air ducts-labyrinths to work like an ionizer.

The ionizer is adjusted by changing the voltage of the power supply (constant current source) 16. See FIG. 2-4.

For more efficient emission of electrons from negative electrodes, it is preferable to use materials with an electron work function of less than 3.1 eV, because the spectrum of ultraviolet radiation quanta, as a result of multiple reflection and partial absorption, is shifted towards visible light, and materials with such an electron work function allow make the most of the ionizing power of light. For example, hafnium carbide ionizes at 2.04 eV, which corresponds to the orange spectrum of visible light. The condition for the work function of an electron less than or equal to 4.9 eV is not strict, because 4.9 eV is the maximum, and some of the quanta have an energy of more than 4.9 eV.

The above embodiments of the invention are exemplary and allow you to add new options or modify those described.

Industrial applicability.

An ultraviolet bactericidal irradiator-recirculator can be implemented by a specialist in practice and, when implemented, ensures the implementation of the declared purpose. The possibility of implementation by a specialist in practice follows from the fact that for each feature included in the claims based on the description, a material equivalent is known, which allows us to conclude that the criterion of "industrial applicability" for the invention, as well as the criterion of "completeness of disclosure" for the invention.

In accordance with the proposed invention, the applicants made a prototype, which included a housing 1 with inlet 3 and outlet 4 windows, in which an irradiation chamber 2 was formed, the inner surface of which was covered with a material that reflects ultraviolet radiation with bactericidal ozone-free ultraviolet lamps placed therein, equipped with at the entrance and exit labyrinth screens 5.1 and 5.2, located on the inner surface of the irradiation chamber, emission electrode 10 in front of the output labyrinth screen 5.2 and installed fan 7 and filter 8, according to the layout.

The filter 8 was placed in the inlet, and the fan, respectively, in the outlet windows on the end surfaces of the housing. Labyrinth screens 5.1 and 5.2 consisted of two symmetrically located partitions, in which many air holes were made in the form of labyrinths, and the surface of the partitions facing the inside of the chamber was covered with a material that reflects ultraviolet radiation, and the inner surface of the air ducts was covered with a material that absorbs ultraviolet radiation, namely titanium coated with titanium carbide.

Inside the building 1, between the entrance labyrinth screen and bactericidal ozone-free ultraviolet lamps, a removable electrostatic filter 8 was installed to clean the air from particles, the size of which does not exceed 0.01 microns, and a removable air oxygen ionizer was located between the exit labyrinth screen and bactericidal ozone-free ultraviolet lamps ... The inner coating of the irradiation chamber 2 is made of materials with a work function of electrons substantially more than 4.9 eV, namely, aluminum with an Al ₂ O ₃ oxide film and a work function of an electron of 7.35 eV was used.

Experimental operation of such a device has shown that it not only disinfects the air, but also ionizes it additionally.

The proposed device also has an additional advantage, expressed in the fact that:

1. The necessary absorption of the energy of quanta of ultraviolet radiation goes mainly to the emission of electrons and the formation of negative air ions of oxygen in the air, and not uselessly in thermal energy, as in the prototype and analogues.

2. In the invention, the positive electrode is in contact with the external environment: the surface of the earth, the surface of the water, the atmosphere, which facilitates the emission of electrons from the negative electrode, since the surface of the water and the earth is negatively charged and makes it difficult for the recombination of negative aeroions formed by the device with positive charges, since there is a barrier between them in the form of walls or other obstacles that isolate the ionizable volume. In the prototype and in analogues, this is absent altogether.

3. Additional EDS is generated in the device due to the photoelectric effect. For example, if in an electrostatic dust collector the emission electrode is coated with hafnium carbide, and the collecting electrode is made of aluminum with a film of Al ₂ O ₃ , then the additional EDS between the electrodes there will be 7.35 V - 2.04 V = 5.31 V, which remains with the voltage source turned off at the electrodes, but with the ultraviolet lamps on.

The power consumption of the device depends on the power and the number of germicidal ozone-free ultraviolet lamps and the power of the fans.

The parameters of the built-in ionizer were as follows: power no more than 5 W, at a current voltage from 36 V to 220 V and depends on the speed and volume of the processed air passing through the device. The built-in electrostatic dust collector has a current voltage of 36 V to 220 V, depending on the layout options. As a grounding, in rooms, you can use the grounding of the general purpose electrical network, if present.

The electric current of the emission electrons generated by the ionizer ranges from 1 μA to 7 μA, depending on the setting. The source of constant voltage can be both autonomous sources - primary current sources, storage batteries, and a general-purpose electrical network. The material of the positive electrode in contact with the external environment, is selected from considerations of inertia and the maximum electron affinity, in particular with the aluminum oxide film Al ₂ O _{3 with} A = 7.35 eV for the atmosphere, and copper or platinum for the contact with the ground or water.

The spectral reflectance of Al with an Al ₂ O ₃ oxide film _of near UV radiation with a photon energy of 3.10 to 4.9 electron volts and visible light is in the range from 0.80 to 0.93. In addition, the reflection coefficient in the visible and near UV regions is high and only a small part is absorbed by the material.

Quantum yield (Ɣ) is the number of emitted electrons per photon incident on the surface of the body.

In the visible and near UV regions, Ɣ is less than or equal to 0.001 electron / photon. Taking into account multiple reflections in this installation, the quantum efficiency Ɣ increases significantly, and taking into account the supply of negative potential to the electrodes, Ɣ increases even more, depending on the voltage value.

The electron affinity energy is positive for an oxygen molecule and is equal to 0.45 eV, while for a water molecule it is 0.8 eV and is absent or negative for argon and nitrogen, therefore, stable negative aeroions can only be found in oxygen and water molecules when emission electrons are attached, which is used in this invention to enrich the air with negative air ions

Thus, due to the above features, the claimed technical result is achieved - increasing the efficiency of disinfection and improving the quality of the treated air by enriching the air with negative air ions of oxygen in the air and neutralizing harmful positively charged light and heavy air ions and cleaning it from dust and spores. This is achieved, in particular, due to the fact that in the installation for increasing the emission of electrons from the negative electrode, in addition to the potential difference supplied to the electrodes, an external photoelectric effect is also used and chemically inert materials with a minimum work function of the electron are selected, which allows a significant decrease in the operating voltage at the electrodes ionizer and electrostatic dust collector.

Claims (10)

1. An ultraviolet bactericidal air recirculator-irradiator, including a body in which an irradiation chamber is formed, the inner surface of which is covered with a material that reflects ultraviolet radiation, a fan, a filter and containing an entrance window and an exit window, absorbing airway labyrinth screens located near the entrance window and an exit window, a source of ultraviolet germicidal ozone-free radiation located in the body and a removable electrostatic dust collector, characterized in that the inner surface of the body and screens are covered with a material that reflects ultraviolet radiation, and an emission electrode is located inside the body in front of the exit airway absorbing screen on the inner surface of the body, connected with grounding or outlet to the external environment through a voltage source, while the emission electrode and absorption airway labyrinth screens are made of material or coated with a material, chemically and inert with respect to substances in atmospheric air and having an electron work function of less than 4.9 eV for the material of the emission electrode and less than or equal to 3.1 eV for the coating of the walls of the labyrinths. 2. Air recirculator-irradiator according to claim 1, characterized in that the emission electrode, the airway absorbing labyrinth screens and the electrostatic dust collector are connected to the housing and the irradiation chamber through insulators. 3. Air recirculator-irradiator according to claim 1, characterized in that the inner surface of the chamber and the irradiation screens are coated with aluminum. 4. Air recirculator-irradiator according to claim 1, characterized in that the material having the work function of the electron less than 4.9 eV and more than 3.1 eV is selected as the coating material for the emission electrode. 5. Air recirculator-irradiator according to claim 4, characterized in that one of the following materials is selected as the coating material for the emission electrode: titanium, manganese diboride, vanadium diboride, zirconium diboride, chromium diboride, niobium diboride, titanium sulfide, tungsten, zinc , boron, silicon, tantalum, gold, silver, graphite, osmium, rhodium, ruthenium, molybdenum, and iron. 6. Air recirculator-irradiator according to claim 4, characterized in that silver coated with silver sulfide is selected as the coating of the emission electrode, and the coating material of the labyrinth walls is made of hafnium carbide. 7. Air recirculator-irradiator according to claim 1, characterized in that the material having the work function of the electron less than or equal to 3.1 eV is selected as the coating material for the emission electrode and the coating of the labyrinth walls. 8. Air recirculator-irradiator according to claim 7, characterized in that one of the following materials is selected as the coating material for the emission electrode and for the coating of the labyrinth walls: scandium diboride, niobium carbide, titanium carbide, titanium oxide, tungsten diboride, hafnium carbide, carbide tantalum, zirconium carbide. 9. Air recirculator-irradiator according to claim 7, characterized in that titanium with titanium carbide deposited on it is selected as the material of the emission electrode, and the coating of the labyrinth walls is made of titanium carbide. 10. Air recirculator-irradiator according to claim 7, characterized in that titanium with hafnium carbide deposited on it is selected as the material of the emission electrode, and the coating of the labyrinth walls is made of hafnium carbide.

Images