CN114307512A - Air disinfection and sterilization method - Google Patents
Air disinfection and sterilization method Download PDFInfo
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- CN114307512A CN114307512A CN202011082549.1A CN202011082549A CN114307512A CN 114307512 A CN114307512 A CN 114307512A CN 202011082549 A CN202011082549 A CN 202011082549A CN 114307512 A CN114307512 A CN 114307512A
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- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
The invention provides an air disinfection and sterilization method, which is applied to an air disinfection and sterilization device and comprises the following steps: acquiring temperature information of a lamp tube in a reaction chamber and air volume information of an air outlet; determining a corresponding target strategy based on the temperature information and the wind volume information; the gas at the gas inlet is treated based on a target strategy. That is to say, the microwave oven is controlled based on the independent magnetron power supply, the air is efficiently purified under the action of the ultraviolet lamp, the equipment structure is simple, the energy consumption of the equipment is low, and the equipment can stably run for a long time.
Description
Technical Field
The invention relates to the technical field of air purification, in particular to an air disinfection and sterilization method.
Background
In recent years, due to the development of science and technology and the progress of society, air quality deterioration in all parts of the country is aggravated by industrial emissions of factories, automobiles and the like, and severe weather frequently occurs. People reduce energy consumption, improve the air tightness of buildings, reduce the ventilation volume in the buildings and further worsen the indoor air environment. Under such circumstances, people are paying attention to the influence of the gradually worsening air pollution on their health and daily life, and how to deal with and deal with the problem is a subject to which much research and search is currently required.
At present, the indoor air pollutants mainly comprise particulate matters, harmful bacteria, VOCs, carbon monoxide, nitrogen oxides, ammonia, ozone, hydrogen sulfide, radon and the like. In the prior art, pollutants in air are treated mainly based on a catalyst and an activated carbon adsorption technology.
However, in the prior art, in the process of treating pollutants in air by using an air purification device, the problems of low treatment efficiency, complex equipment structure and high energy consumption exist.
Disclosure of Invention
The present invention aims at providing one kind of air sterilizing method to solve the problems of low cost, high power consumption and low ozone concentration.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, the present invention provides an air sterilization method, comprising:
acquiring temperature information of a lamp tube in a reaction chamber and air volume information of an air outlet;
determining a corresponding target strategy based on the temperature information and the air volume information;
treating the gas at the gas inlet based on the target strategy.
Optionally, the determining a corresponding target policy based on the temperature information and the air volume information includes:
judging the relation between the temperature information and a preset temperature to obtain a first judgment result;
controlling the working state of the power supply of the magnetron based on the first judgment result; wherein the working state comprises standby and normal working.
Optionally, the method further includes:
adjusting the power of a microwave source based on the air volume information;
and treating the air of the air inlet based on the adjusted microwave source power.
Optionally, the air volume information is linearly related to the microwave source power.
In a second aspect, the present invention also discloses an air sterilization device, comprising: the microwave oven comprises a reaction cavity, an air inlet, a lamp tube fixing seat, a sealing plate, an internal air outlet, a negative pressure cavity, a microwave source, a magnetron power supply and an air outlet;
wherein the sealing plate separates the reaction chamber from the negative pressure chamber; the microwave source and the magnetron power supply are respectively arranged on the sealing plate; the lamp tube is fixed on the lamp tube fixing seat, and the lamp tube fixing seat is arranged at the bottom of the reaction cavity; air enters the reaction cavity from the air inlet, reacts under the action of the lamp tube and the microwaves, and gas after reaction is discharged into the negative pressure cavity from the inner air outlet and is discharged from the air outlet.
In a third aspect, the present invention also discloses an air sterilizer, comprising: an acquisition module, a determination module and an output module,
the acquisition module is used for acquiring the temperature information of the lamp tube in the reaction cavity and the air volume information of the air outlet;
the determining module is used for determining a corresponding target strategy based on the temperature information and the air volume information;
the output module is used for processing the gas of the gas inlet based on the target strategy.
In a fourth aspect, the present invention also discloses an electronic device, including: comprising a processor, a memory for storing instructions, the processor being configured to execute the instructions stored in the memory to cause the apparatus to perform the air disinfection apparatus as described above in relation to the first aspect.
In a fifth aspect, the present invention also discloses a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, which when executed, cause a computer to execute the air sterilizer according to the first aspect.
The invention has the beneficial effects that: the invention provides an air disinfection and sterilization method, which comprises the following steps: acquiring temperature information of a lamp tube in a reaction chamber and air volume information of an air outlet; determining a corresponding target strategy based on the temperature information and the air volume information; treating the gas at the gas inlet based on the target strategy. That is to say, the microwave oven is controlled based on the independent magnetron power supply, the air is efficiently purified under the action of the ultraviolet lamp, the equipment structure is simple, the energy consumption of the equipment is low, and the equipment can stably run for a long time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic flow chart of an air sterilizer according to an embodiment of the present invention;
FIG. 2 is a schematic view of an air sterilizer according to another embodiment of the present invention;
FIG. 3 is a schematic view of an air sterilizer according to another embodiment of the present invention;
fig. 4 is a schematic view of an air sterilizer according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
FIG. 1 is a schematic flow chart of a method for sterilizing air according to an embodiment of the present invention; FIG. 2 is a schematic view of an air sterilizer according to another embodiment of the present invention; FIG. 3 is a schematic view of an air sterilizer according to another embodiment of the present invention; fig. 4 is a schematic view of an air sterilizer according to another embodiment of the present invention. The following will describe in detail the air purification process provided by the embodiment of the present invention with reference to fig. 1 to 4.
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a schematic flow chart of an air sterilization method for an air purification apparatus is provided according to an embodiment of the present invention. The steps involved in the method are described in detail below with reference to fig. 1.
Step 101: and acquiring the temperature information of the lamp tube in the reaction cavity and the air volume information of the air outlet.
In the embodiment of the invention, the air outlet of the air purification treatment device is provided with the air volume sensor, the temperature sensor is arranged in the reaction cavity, and the air volume information of the air inlet gas and the temperature of the ultraviolet lamp in the reaction cavity are detected based on the sensor. The air entering the air inlet may comprise a variety of air, including, for example, VOCs, carbon dioxide, hydrogen sulfide, carbon monoxide, ammonia, and the like.
Step 102: a corresponding target policy is determined based on the temperature information and the wind volume information.
In the embodiment of the present invention, the target policy includes: a control strategy of safe processing and a control strategy of energy conservation and environmental protection. Optionally, the working state of the magnetron is adjusted according to the temperature information, so that a safety control strategy for processing the air inside the reaction chamber is achieved. Or the controller adjusts the power of the microwave source according to the air volume information of the air outlet, so that an energy-saving and environment-friendly control strategy is achieved.
In the embodiment of the present invention, step 102 determines a corresponding target policy based on the temperature information and the air volume information, and specifically may be implemented by the following steps:
step A1: and judging the relation between the temperature information and the preset temperature to obtain a first judgment result.
In the embodiment of the present invention, the preset temperature is a temperature at which the lamp normally works, and for example, the threshold of the preset temperature is 60 to 80 ℃. The sensor in the reaction cavity acquires temperature information of the lamp tube and sends the acquired temperature information to the controller, and the controller judges the relationship between the acquired temperature information and preset temperature to obtain a first judgment result. Here, the first determination result includes that the collected temperature information is greater than the preset temperature and that the collected temperature information is less than or equal to the preset temperature.
Step A2: controlling the working state of the power supply of the magnetron based on the first judgment result; wherein, the working state comprises standby and normal operation.
In the embodiment of the invention, if the first judgment result represents that the acquired temperature information is greater than the preset temperature, the magnetron is controlled to be in standby close, so that the magnetron is protected, and the effect of prolonging the service life of equipment is achieved; if the first judgment result represents that the acquired temperature information is less than or equal to the preset temperature, the magnetron normally works, and whether each lamp tube in the reaction cavity normally works is further detected.
Optionally, step 102 determines a corresponding target policy based on the temperature information and the wind volume information, and may specifically be implemented by the following steps:
step B1: and adjusting the power of the microwave source based on the air volume information.
In the embodiment of the invention, the air volume sensor arranged at the processor port linearly adjusts the power of the microwave source according to the air volume information. Wherein, the air quantity information is positively correlated with the power of the microwave source.
Step B2: and treating the air at the air inlet based on the adjusted microwave source power.
In the embodiment of the invention, the air quantity sensor sends the acquired air quantity information to the controller, the controller regulates the power of the microwave source in advance according to the air quantity information, and the regulated microwave power is adopted to regulate the air in the reaction cavity.
Step 103: the gas at the gas inlet is treated based on a target strategy.
In the embodiment of the invention, the controller executes the corresponding target strategy according to the temperature information and the air volume information of the air outlet, and purifies the air entering from the air inlet under the state of the corresponding target strategy.
In an embodiment of the present invention, an air sterilization method is provided, which includes: acquiring temperature information of a lamp tube in a reaction chamber and air volume information of an air outlet; determining a corresponding target strategy based on the temperature information and the wind volume information; the gas at the gas inlet is treated based on a target strategy. That is to say, the microwave oven is controlled based on the independent magnetron power supply, the air is efficiently purified under the action of the ultraviolet lamp, the equipment structure is simple, the energy consumption of the equipment is low, and the equipment can stably run for a long time.
In another possible embodiment, the present invention further provides an air sterilizer, as shown in fig. 2, comprising: the microwave oven comprises a reaction cavity 1, an air inlet 2, a lamp tube 3, a lamp tube fixing seat 4, a sealing plate 5, an internal air outlet 6, a negative pressure cavity 7, a microwave source 8, a magnetron power supply 9 and an air outlet 10.
In the embodiment of the invention, air purification refers to providing an integrated solution for sterilizing, disinfecting, reducing dust and haze, removing harmful decoration residues and peculiar smell aiming at various indoor environmental problems, improving the life and office conditions and promoting physical and mental health. The indoor environmental pollutants and pollution sources mainly comprise radioactive gases, mold, particulate matters, decoration residues, second-hand smoke and the like.
Wherein, the sealing plate 5 separates the reaction cavity 1 from the negative pressure cavity 7; the microwave source 8 and the magnetron power supply 9 are respectively arranged on the sealing plate 5; the lamp tube 3 is fixed on the lamp tube fixing seat 4, and the lamp tube fixing seat 4 is arranged at the bottom of the reaction cavity 1; air enters the reaction cavity 1 from the air inlet 2, reacts under the action of the lamp tube 3 and microwaves, and gas after reaction is discharged into the negative pressure cavity from the inner air outlet and is discharged from the air outlet.
In the embodiment of the present invention, the reaction chamber 1 is made of a metal material, and the metal is made of a high temperature resistant metal material. Microwave source 8 refers to a device that generates microwave energy, referred to as a microwave source. Here, the microwave source 8 includes a plurality of microwave sources 8, and the plurality of microwave sources 8 are distributed in an array on the top of the reaction chamber. The microwave is an electric wave having a frequency of 300 mhz to 300 ghz, and water molecules in the heated medium material are polar molecules. Under the action of a rapidly changing high-frequency point magnetic field, the polarity orientation of the magnetic field changes along with the change of an external electric field. The effect of mutual friction motion of molecules is caused, at the moment, the field energy of the microwave field is converted into heat energy in the medium, so that the temperature of the material is raised, and a series of physical and chemical processes such as thermalization, puffing and the like are generated to achieve the aim of microwave heating.
The microwave heating has the following advantages: the heating time is short; the heat energy utilization rate is high, and energy is saved; heating uniformly; the microwave source is easy to control, and the microwave can also induce the catalytic reaction.
The microwave is generated by a microwave source, which is mainly composed of a high-power magnetron. The magnetron is a device which completes energy conversion by utilizing the movement of electrons in vacuum and can generate high-power microwave energy, for example, a 4250MHz magnetic wave tube can obtain 5MHz, and a 4250MHz klystron can obtain 30MHz, so that the microwave technology can be applied to the technical field of wastewater treatment.
Optionally, the lamp tube 3 is an electrodeless ultraviolet lamp with a wavelength of 254 nm.
In the embodiment of the present invention, the lamp tube 3 is uniformly disposed on the lamp tube fixing seat 4. The magnetron power supply 9 is used to power a magnetron to generate microwaves and radiate the microwaves directionally from the waveguide port to the target object through the waveguide tube. The magnetron emits high-frequency electromagnetic waves, the electrodeless ultraviolet lamp tube is lightened, electrodeless ultraviolet rays with specific wavelengths are generated, ozone is generated, and bacteria and viruses are killed by utilizing the strong oxidizing property of the ozone and the strong radiation of the high-frequency electromagnetic waves. Furthermore, the 254nm electrodeless ultraviolet lamp can rapidly decompose ozone molecules to generate oxygen, so that secondary pollution is avoided.
Optionally, the air inlet comprises a first metal net, a filter screen and a second metal net; wherein, the metal net I is used for protecting the filter screen; the aperture of the second metal net is less than or equal to 3 mm.
In the embodiment of the invention, the first metal net is arranged on the outermost side of the air inlet 2, the second metal net is arranged on the inner side of the air inlet 2, the filter screen is arranged between the first metal net and the second metal net, and the first metal net is used for protecting the filter screen, so that the filter screen is prevented from being damaged. Further, after entering from the air inlet, the air is firstly filtered by the filter screen to filter large particles in the air, and then the filtered air is discharged into the reaction chamber 1. Optionally, the filter screen is detachable, and convenient regular replacement and cleanness prevent to block up, cause equipment trouble.
Illustratively, metal meshes are respectively arranged at the air inlet 2 and the inner air outlet 6 of the microwave ozone eliminating device to prevent the microwave from leaking. Furthermore, the aperture of the metal net is less than or equal to 3 mm. Here, in order to prevent the microwave leakage. When the human body is very close to the microwave radiation source for a long time, the phenomena of dizziness, sleep disorder, hypomnesis, bradycardia, blood pressure reduction and the like are caused by excessive radiation energy. When the microwave leakage reaches 1mw/cm2, the eyes suddenly feel dazzled, the vision is degraded, and even cataract is caused. In order to ensure the health of users, metal nets are arranged at the inlet and the outlet of the reaction cavity, and the corners can generate microwave discharge under the action of microwaves, so that dangerous accidents are easy to happen. The metal mesh can block microwave leakage, reduce the damage of microwave to human body and improve the safety of the system.
Optionally, the sealing plate is connected with the reaction chamber through glue; wherein, the glue is a material which does not absorb microwave.
In the embodiment of the invention, the sealing plate 5 is a metal plate, so that the heat dissipation capability is strong. The sealing plate is bonded to the side wall of the reaction chamber 1 by a high-strength adhesive glue. Optionally, in order to reduce microwave absorption, the glue is made of a material that does not absorb microwaves, such as silica gel, polytetrafluoroethylene, and the like.
Optionally, a third metal net is arranged at the inner air outlet; wherein the aperture of the third metal net is less than or equal to 3 mm.
In the embodiment of the invention, the metal net III and the metal net II have the same function and are used for preventing microwave leakage, thereby causing harm to human bodies.
Optionally, the air outlet further comprises a fan.
In the embodiment of the invention, the air blower is arranged at the air outlet 10, wherein the air blower is a blower capable of forming negative pressure, air enters the reaction cavity 1 from the air inlet 2 under the driving of the negative pressure air blower, and gas after reaction enters the negative pressure cavity 7 from the inner air outlet 6 and finally flows out from the air outlet 10. The purified air plays a role in heat dissipation of the magnetron at the same time. Due to the size limit, the magnetron of the equipment does not have an active cooling fan, and needs to be cooled after air flows by an external fan.
The embodiment discloses an air disinfection and sterilization device, includes: the microwave oven comprises a reaction cavity 1, an air inlet 2, a lamp tube 3, a lamp tube fixing seat 4, a sealing plate 5, an internal air outlet 6, a negative pressure cavity 7, a microwave source 8, a magnetron power supply 9 and an air outlet 10; wherein, the sealing plate 5 separates the reaction cavity 1 from the negative pressure cavity 7; the microwave source 8 and the magnetron power supply 9 are respectively arranged on the sealing plate 5; the lamp tube 3 is fixed on the lamp tube fixing seat 4, and the lamp tube fixing seat 4 is arranged at the bottom of the reaction cavity 1; air enters the reaction cavity 1 from the air inlet 2, reacts under the action of the lamp tube 3 and microwaves, and gas after reaction is discharged into the negative pressure cavity 7 from the inner air outlet 6 and is discharged from the air outlet 10. The invention purifies the air based on the action of the microwave and the electrodeless ultraviolet lamp, realizes the high-efficiency purification of the air, has simple equipment structure and low energy consumption of the equipment, and can stably operate for a long time.
Fig. 3 is a schematic diagram of a microwave-based urea hydrolysis apparatus according to another embodiment of the present invention. The device includes: an acquisition module 301, a determination module 302, an output module 303,
the acquisition module is used for acquiring the temperature information of the lamp tube in the reaction cavity and the air volume information of the air outlet;
the determining module is used for determining a corresponding target strategy based on the temperature information and the wind amount information;
an output module to process the gas at the gas inlet based on a target strategy.
It should be noted that, for the descriptions of the same steps and the same contents in this embodiment as those in other embodiments, reference may be made to the descriptions in other embodiments, which are not described herein again.
In an embodiment of the present invention, an air sterilization device includes: the acquisition module is used for acquiring the temperature information of the lamp tube in the reaction cavity and the air volume information of the air outlet; the determining module is used for determining a corresponding target strategy based on the temperature information and the wind amount information; an output module to process the gas at the gas inlet based on a target strategy. That is to say, the microwave oven is controlled based on the independent magnetron power supply, the air is efficiently purified under the action of the ultraviolet lamp, the equipment structure is simple, the energy consumption of the equipment is low, and the equipment can stably run for a long time.
FIG. 4 is a schematic diagram of a urea hydrolysis plant based on microwave, which is integrated in a terminal device or a chip of the terminal device, according to another embodiment of the present invention.
The device includes: memory 401, processor 402.
The memory 401 is used for storing programs, and the processor 402 calls the programs stored in the memory 401 to execute the above-mentioned embodiments of the air sterilizer. The specific implementation and technical effects are similar, and are not described herein again.
Preferably, the invention also provides a program product, such as a computer-readable storage medium, comprising a program which, when being executed by a processor, is adapted to carry out the above-mentioned method embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Claims (8)
1. An air disinfection and sterilization method is applied to an air disinfection and sterilization device, and is characterized by comprising the following steps:
acquiring temperature information of a lamp tube in a reaction chamber and air volume information of an air outlet;
determining a corresponding target strategy based on the temperature information and the air volume information;
treating the gas at the gas inlet based on the target strategy.
2. The air disinfecting and sterilizing method of claim 1, wherein the determining a corresponding target strategy based on the temperature information and the air volume information comprises:
judging the relation between the temperature information and a preset temperature to obtain a first judgment result;
controlling the working state of the power supply of the magnetron based on the first judgment result; wherein the working state comprises standby and normal working.
3. The air sterilizer of claim 2, further comprising:
adjusting the power of a microwave source based on the air volume information;
and treating the air of the air inlet based on the adjusted microwave source power.
4. The air sterilization method according to claim 3, wherein the air volume information is linearly related to the power of the microwave source.
5. An air sterilizer, comprising: the microwave oven comprises a reaction cavity, an air inlet, a lamp tube fixing seat, a sealing plate, an internal air outlet, a negative pressure cavity, a microwave source, a magnetron power supply and an air outlet;
wherein the sealing plate separates the reaction chamber from the negative pressure chamber; the microwave source and the magnetron power supply are respectively arranged on the sealing plate; the lamp tube is fixed on the lamp tube fixing seat, and the lamp tube fixing seat is arranged at the bottom of the reaction cavity; air enters the reaction cavity from the air inlet, reacts under the action of the lamp tube and the microwaves, and gas after reaction is discharged into the negative pressure cavity from the inner air outlet and is discharged from the air outlet.
6. An air sterilizer, comprising: an acquisition module, a determination module and an output module,
the acquisition module is used for acquiring the temperature information of the lamp tube in the reaction cavity and the air volume information of the air outlet;
the determining module is used for determining a corresponding target strategy based on the temperature information and the air volume information;
the output module is used for processing the gas of the gas inlet based on the target strategy.
7. An electronic device, characterized in that the electronic device comprises: comprising a processor, a memory for storing instructions, the processor being configured to execute the instructions stored in the memory to cause the apparatus to perform the air disinfection method of any of claims 1-4.
8. A computer-readable storage medium having stored therein computer-executable instructions that, when executed, cause a computer to perform the air sanitizer method of any one of claims 1 to 4.
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| CN202011082549.1A CN114307512A (en) | 2020-10-12 | 2020-10-12 | Air disinfection and sterilization method |
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