CN111306669A - Air sterilizing and purifying method and device - Google Patents
Air sterilizing and purifying method and device Download PDFInfo
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- CN111306669A CN111306669A CN202010272945.4A CN202010272945A CN111306669A CN 111306669 A CN111306669 A CN 111306669A CN 202010272945 A CN202010272945 A CN 202010272945A CN 111306669 A CN111306669 A CN 111306669A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/20—Casings or covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
- F24F8/167—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using catalytic reactions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/192—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
- F24F8/22—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using UV light
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
- F24F8/24—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using sterilising media
- F24F8/26—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using sterilising media using ozone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/30—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by ionisation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/20—Casings or covers
- F24F2013/205—Mounting a ventilator fan therein
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
The invention discloses an air disinfection and purification method, which is used for disinfecting and purifying indoor air, and the purification method utilizes a one-way air channel with a negative pressure fan as an air treatment space, a cavity is arranged on the one-way air channel, an air pressure difference is formed between the air outlet side and the negative pressure fan through a filtering structure, negative ion clouds are formed in the cavity through continuously generated negative ions by utilizing the air pressure difference for carrying out air sterilization and purification, bacteria and viruses are adsorbed and agglomerated in the sterilization process, agglomerate aerosol is formed in the negative ion clouds, and then the filtration structure is utilized for adsorption; the invention also provides a purification device based on the purification method, which generates negative ions by utilizing ultraviolet irradiation ionization and provides beneficial factors for sterilization and purification treatment of the negative ion cloud in the purification cavity through structural optimization. The invention has high sterilization and purification efficiency, low sterilization cost and quick effect taking, and can realize human-machine coexistence in a closed indoor space.
Description
Technical Field
The invention relates to the technical field of air disinfection and purification, in particular to an air disinfection and purification method and device with a good purification effect in a low-flow-rate environment space.
Background
In order to prevent infection and health problems that may be caused by biological, physical and chemical pollution of air in a relatively closed indoor space, more and more air purification technologies and related apparatuses having a variety of different air purification principles and methods are put into use. The air purification concept is different from the air purification concept in the industrial field and the general concept of indoor air quality, the core concept of air purification in hospitals and epidemic situations is disinfection and sterilization, and microbial pollution is strictly controlled, while the application trend of the indoor air purification technology in hospitals in China is that the industrial air purification technology occupies the wind, and the medical disinfection and sterilization air purification technology is in a weak position.
Typical examples are that the air sanitation indexes and disinfection and sterilization sanitation concepts of national standard class I environment and class II environment which are generally familiar to hospitals originally are subtly changed into indexes and industrial purification concepts of hundred grade, thousand grade and ten thousand grade which are classified by the number of dust.
2008 and 2011 Germany (Christian B, Uwe H, Dorit S, et al, Operating and rotation air flow show no protective effect on the protective inorganic infection rate in organic and anionic Surgery [ J ];
Annals of Surgery by American Surgical Association/European SurgicalAssociation U.S.，2008, 248 (5):695-700）
and New Zealand (G.J. Home. A.G. Rothwell et al. Does the use of a ventilator floor and space requirements reduce early infection after infection of high level laminar flow purification and Joint Surgery infection [ J ] By Journal of Bone and Joint Surgery-British Volume 2011, Volume 93-B, Issue 1, 85-90.) the higher the surgical infection rate, the more profound and questionable purification effects in the world medical and purification circles are caused.
In addition, the existing air disinfection purifier mainly comprises active carbon which utilizes a physical adsorption function according to disinfection conditions, uses a negative ion generator, is forcibly filtered by machinery, is sprayed with a chemical disinfectant, has electrostatic adsorption and realizes air purification by utilizing the action of an ultraviolet light catalytic material; the above methods are also combined to perform a sterilization and purification treatment of air.
Among the above treatment means, the activated carbon material, the mechanical filter structure and the electrostatic adsorption material mainly take adsorption and filtration of particulate matters as main means, and the activated carbon material and the mechanical filter structure adsorb suspended particle pollutants and harmful gases in air flow by utilizing van der waals force existing between surfaces of objects to purify the air; the electrostatic adsorption material separates and adsorbs the particles from the air flow by electrostatic discharge and the action of coulomb force, thereby achieving the purpose of purifying the air; although the activated carbon material and the mechanical filtering structure have more than 99.9 percent of filtering efficiency on particulate impurities with the particle size of more than or equal to 0.3 mu m and have better treatment effect on harmful gases such as formaldehyde and the like, the activated carbon material and the mechanical filtering structure have the defect that only dust can be filtered out, and the treatment effect on bacterial and viral aerosols with the particle size of 0.003-0.06 mu m is poorer; the electrostatic adsorption material can adsorb bacteria and virus aerosol with the particle size of 0.003-0.06 mu m, but the adsorption effect of the electrostatic adsorption material is greatly influenced by the material and/or an external electric field, the treatment mode of the bacteria and the viruses is mainly adsorption and cannot be killed, the bacteria and the viruses can be attached to an adsorbed contact surface to continuously propagate and grow after being adsorbed, the adsorption and filtration resistance can be continuously increased while metabolic wastes and toxins are generated, the risk of secondary pollution is gradually increased, the trend is more obvious in a high-temperature and high-humidity area, the air purification and sterilization effects of equipment are obviously reduced, the cleaning and maintenance of an activated carbon material, a mechanical filtration structure and electrostatic adsorption are frequent and troublesome, the normal use of the equipment is influenced, and the use cost is increased.
The negative ion generator, the chemical disinfectant and the ultraviolet light catalytic material have a sterilization effect, wherein the negative ion generator is complex in structure, high in manufacturing cost, large in size and not suitable for being placed indoors; the requirement on a power supply serving as a load is high, a discharge tip is easily dull and invalid due to a sputtering effect and is difficult to perceive, in addition, the negative ion generator also has the problem of poor sterilization effect uniformity, the plasma concentration at a position slightly far away from a discharge position is low, and the air disinfection and purification effect is correspondingly poor; meanwhile, the plasma reactor is easy to generate ignition and arc discharge in the working process, and can continuously generate adverse factors such as ozone, nitrogen oxide and the like. The chemical disinfectant has good environmental disinfection effect and low cost, but the chemical reagent has great influence on human body, particularly respiratory tract, and the sprayed and killed space is not suitable for being used for a long timeSome of the chemical disinfectants become secondary infection sources, some of the chemical disinfectants can not eliminate organic harmful residual substances to cause environmental pollution, some of the chemical disinfectants used blindly can destroy the natural balance of microorganisms, threaten the health and living environment of people, and the chemical disinfectants still do not treat particulate matters blocking breathing in the air. The sterilization output forms of the ultraviolet light catalytic material are mainly three types: radiation sterilization, ozone catalytic sterilization and photocatalytic reaction, and the action output proportion of three sterilization modes can be controlled by controlling ultraviolet light under different ultraviolet light wavelength conditions. The radiation sterilization is to utilize ultraviolet light with specific wavelength to radiate energy under the action of high voltage to kill microbes such as bacteria and viruses, and has the defects that the ultraviolet light can also cause damage to eyes and skin of a human body, and simultaneously certain action time is needed when the bacteria and the viruses are killed, and experiments prove that the ultraviolet radiation intensity is 1000 mu w/cm2Under the radiation intensity condition of (1): the average time required to 100% kill the following common different bacteria and viruses is: 12.3s of mycobacterium tuberculosis (mycobacterium), 19.2s of vibrio cholerae, 15.3s of salmonella, 15.9s of typhimurium, 36.9s of staphylococcus, 9s of bacillus anthracis, 6.9s of influenza virus, 24s of poliovirus, 21.9s of hepatitis b virus, 144s of Sars virus and 126s of novel pneumonia virus, while a common circulating wind ultraviolet sterilizer in the prior art exposes an ultraviolet lamp tube in the air to sterilize the flowing air, the time of contacting the air in unit area with ultraviolet is in millisecond level, and the sterilizing effect is difficult to realize; in addition, ultraviolet light has two forms of disinfection and killing by respectively generating ozone or photocatalyst TiO through catalysis2The ozone catalytic sterilization is mainly to perform sterilization and disinfection by utilizing the unstable characteristic and strong oxidation effect of the product ozone generated by catalysis, has obvious sterilization effect, has great influence on human bodies, and is easy to damage respiratory tracts and human body cells if the density in the air is too high; the defects of the photocatalytic reaction are similar to those of ultraviolet radiation disinfection, the photocatalytic reaction is obviously restricted by air flow, and the illuminated ultraviolet is easy to leak, so that the photocatalytic reaction also has the problem of damage to human skin and eyes; therefore, after the traditional ultraviolet lamp is irradiated and disinfected, the traditional ultraviolet lamp is opened for 20-60 minutes in advance and then is opened for ventilationCan enter.
For the above reasons, although the prior art using these methods and devices designed according to the prior art can effectively remove airborne dust and fine particles such as smoke dust in the air, and can catalyze and degrade harmful gases by these methods, it is not possible to completely eliminate harmful microorganisms and decompose metabolites of microorganisms, and it is very difficult to achieve human-machine coexistence in relatively closed spaces, especially in closed spaces in high-temperature and high-humidity areas, and these methods greatly limit the application of air sterilization technology in relatively closed spaces with high requirements for environmental air, such as hospital operating rooms and intensive care units, so that bacterial and viral infection accidents can occur in such relatively closed spaces due to unqualified sterilization, resulting in failure of surgery or medical treatment.
Disclosure of Invention
The invention aims to provide an air disinfection and purification method and device, which can realize human-machine coexistence in the air flow rate, ensure the disinfection quality while considering the environmental air disinfection efficiency and thoroughly solve the air disinfection problem in high-temperature and high-humidity areas.
The technical problem solved by the invention is realized by adopting the following technical scheme:
an air sterilizing and purifying method, which is used for sterilizing and purifying indoor air, and is realized by the following steps: indoor air is introduced into a one-way air channel through a negative pressure fan, a cavity is arranged on the one-way air channel, and the one-way air channel at the rear part of the cavity is sealed through a filtering structure with filtering and adsorbing functions;
generating a proper wind resistance on the filtering structure by adjusting the thickness and the pore size of the filtering structure, forming a flow speed difference between an air inlet end and an air outlet end of the one-way air channel by utilizing the wind pressure generated by the negative pressure fan and the wind resistance on the filtering structure, controlling the flow speed difference to be 1/5-1/2 that the air flow speed of the air outlet at the air outlet end is the air suction speed of the air inlet end, and utilizing the flow speed difference to retain the indoor air entering the cavity at the position of the cavity and enabling the indoor air retained in the cavity to generate air rotational flow;
under the condition of ensuring the sealing performance, negative ions generated by ultraviolet catalysis are utilized to form negative ion cloud under the driving of air rotational flow in the cavity to sterilize indoor air retained in the cavity, bacteria and viruses are adsorbed and agglomerated in the sterilization process by utilizing the adsorption performance of the negative ions, and an agglomerate aerosol with the diameter of more than or equal to 0.3 mu m is formed in the negative ion cloud;
the generated agglomerate aerosol is adsorbed and filtered at the position of the filtering structure, thereby ensuring the killing rate of bacteria and viruses, reducing the generation of suspended particles and effectively avoiding secondary pollution.
The sterilization principle of the method is as follows:
the air resistance is set to enable the purification cavity to form air rotational flow in the cavity under the condition that the negative pressure fan works; the air molecules or atoms in the generated air rotational flow are neutral, under the condition of ultraviolet ionization, the air molecules lose a part of electrons rotating around atomic nuclei, the escaped free electrons have negative charges and are combined with other neutral gas molecules to also have negative charges and form negative ions, the negative ions generated by ultraviolet excitation are colorless, tasteless, negatively charged and have strong adsorption performance, the negative ions can be continuously increased along with the starting of an ultraviolet sterilizing lamp and form relatively stable negative ion clouds in a purifying cavity under the action of the air rotational flow, the negative ion clouds can be matched with the radiation sterilization and ozone catalytic sterilization of the ultraviolet rays, the sterilization rate of bacteria and viruses in the air can be better than 0.3 mu m, and simultaneously, the bacteria and the viruses can be adsorbed by utilizing the adsorption performance by using the negative ion clouds rotating at high speed, Agglomerating to form an agglomerate aerosol with the diameter of more than or equal to 0.3 mu m, and performing adsorption and filtration treatment operation through a filter structure to further improve the air treatment efficiency and quality; also solves the defect that the activated carbon filter layer and the physical filter layer in the traditional air processor can not kill bacteria and viruses.
Under the technical conditions, due to the action of ultraviolet light, the ozone which can continuously generate the sterilization effect can be generated besides the ultraviolet light and the negative ions generated by catalysis, and based on the sealing property of the cavity, the main beneficial factors are packaged in the cavity and continuously sterilize and purify the air entering the cavity, thereby ensuring the sterilization and purification effects and the efficiency of the air and effectively controlling the precipitation amount of the beneficial factors for sterilization and purification, meanwhile, the negative ions generated by ultraviolet light catalysis are closer to the negative ions generated in the nature, compared with the negative ions generated by high-voltage ionization, the activity is higher, the affinity to human body is better, the stimulation to skin and respiratory tract is not generated, the comfort level of air sucked into human body can be effectively improved by the micro-precipitated negative ions and ozone, therefore, the method can realize human-computer coexistence in a closed space and can ensure normal use under the environmental conditions of high-temperature and high-humidity areas.
The invention also discloses an air disinfection and purification device, which comprises a closed shell, wherein two open surfaces of the closed shell are respectively provided with an air inlet and an air outlet;
the air inlet is provided with a negative pressure fan which sucks the outside air into the purification cavity, and the negative pressure fan is embedded on the closed shell to ensure the closing performance;
the air outlet is sealed by the filtering unit, the sealing is guaranteed at the outer side of the filtering unit, and the air pressure in the purifying cavity is controlled by controlling the thickness of the filtering unit and the size of the filtering pores, so that the air flow rate of the air outlet at the air outlet end is 1/5-1/2 of the air suction rate at the air inlet end under the action condition of the negative pressure fan;
an ultraviolet germicidal lamp for continuously ionizing the air in the cavity to generate negative ions is arranged in the purification cavity, and the ultraviolet intensity of the ultraviolet germicidal lamp is more than or equal to 500 mu w/cm2And completely irradiating the surface of the filter unit.
As further inject, negative pressure fan is axial fan, and axial fan goes up the cover and is equipped with the spiral case, the air-out direction perpendicular to axial fan's the air inlet direction in the interior wind channel of spiral case to the negative pressure effect through negative pressure fan will be with suction device's air blowout on the plane of perpendicular to filter unit, with the reduction to filter unit's front wind pressure impact, guarantee to carry out abundant purification of disinfecting in purifying the chamber.
By way of further limitation, the filtering unit comprises an activated carbon filtering layer close to the purification cavity side and a physical filtering layer arranged outside the activated carbon filtering layer; the active carbon filter layer comprises a layer of honeycomb filter screen bracket, and active carbon is filled and fixed in the honeycomb filter screen bracket; in addition, the activated carbon filter layer can be optionally added with one or a combination of an ionization catalyst for enhancing the ionization action of ultraviolet rays, an ozone active catalyst for enhancing the activity of ozone and a gas adsorbent for adsorbing harmful gases such as formaldehyde; and in order to take the filtering efficiency and the whole thickness setting of the filtering unit into consideration, the physical filtering layer preferably adopts a high-efficiency filtering screen with the filtering grade being more than or equal to H13.
As a further limitation, the air inlet is connected with a front coarse filter system or directly connected with a fresh air system.
As a further limitation, the air outlet is disposed on the closed housing, and a plurality of sets of air outlet windows facing different directions are disposed on the closed housing corresponding to the air outlet.
The ultraviolet sterilization lamp outputs ultraviolet rays with the wavelength of 200-280 nm, and preferably 253.7 nm.
The invention has the advantages and beneficial effects that:
1. the invention has simple structure, convenient manufacture and good sterilization effect, can solve the problems of unsatisfactory air sterilization effect or negative influence on human body in a man-machine coexistence state of a closed space (sterilization of air by personnel in a room), solves the problems of using the air sterilizer (low-level sterilization) and the air purifier in the prior art in a high-temperature and high-humidity area (bacteria pollute the filter screen and propagate on the filter screen to cause the filter screen to become a bacteria scattering device), meets the current medical sanitation requirement standard, and can reach the sterilization level of the middle and high standards;
2. the air purifier effectively filters bacteria larger than 0.3 mu m and dust in the air, blocks an indoor container entering the space of the purifying cavity through the air pressure difference, and forms high-speed rotating pressure air in the purifying cavity, so that the air quantity in unit area is increased, the ultraviolet ionization effect is enhanced, and a large amount of negative ions can be generated. The adsorption capacity of the pressure negative ions rotating at high speed is also enhanced. The adsorption time per unit area is prolonged. The high-speed rotating pressure air changes the movement direction of airborne dust larger than 0.3 mu m, so that the high-efficiency filter screen efficiency is improved;
3. the dynamic sterilization of the existing air sterilizer is changed, and the dynamic sterilization mode and the mechanical air filtration mode are different from the dynamic sterilization mode that the ultraviolet irradiation and the circulating wind ultraviolet of the prior art are that air passes through a high-intensity ultraviolet region or charged particles are captured by the principles of electrostatic adsorption, ions and photocatalysis, the dynamic sterilization mode is improved into static sterilization by the structure, fine particles with the particle size of less than 0.3 mu m suspended in the air are gathered into large particles with the particle size of more than 0.3 mu m by negative ion clouds rotating at high speed and are adsorbed and filtered, the inactivation treatment time of bacteria and viruses in air flow by favorable sterilization factors is effectively prolonged by the mode of blocking the air flow to form rotational flow, and the originally low-efficiency dynamic sterilization is changed into high-efficiency static sterilization without influencing the air circulation in the space.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Wherein: 1. connecting an external power supply; 2. an electric cabinet; 3. a closed housing; 4. a pre-coarse filtration system; 5. a shell air inlet; 6. a negative pressure fan; 7. a volute; 8. a running wheel; 9. an ultraviolet germicidal lamp; 10. detecting a window; 11. an activated carbon filter layer; 12. a physical filtration layer; 13. an air outlet of the shell; 14. a purge chamber.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
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. While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
The embodiment described with reference to fig. 1 discloses an air disinfection and purification device, which comprises a metal assembled and formed closed shell 3, wherein the closed shell 3 is a rectangular shell and is sealed by insulating sealing rubber strips at the joint positions, the ozone leakage amount and the ultraviolet leakage amount in the closed shell 3 can be effectively reduced by the matching of a sealing structure, the ozone content in the environment is prevented from being too high or the ultraviolet leakage radiates the human body, the reduction of the human comfort level in the environment and the damage to the human body in the environment are caused, and a powerful factor is provided for the human-computer coexistence of the improved equipment in the sealed space.
The closed shell 3 is provided with a shell air inlet 5 on the back side of the shell, a shell air outlet 13 on the front side of the shell, and a housing is arranged on the shell air outlet 13, and a plurality of groups of air outlet windows facing different directions are arranged on the housing to provide air outlet in different directions.
The closed shell 3 forms a one-way air channel between the shell air inlet 5 and the shell air outlet 13, and a corresponding left cavity on the one-way air channel is used as a purification cavity 14; the inner side of the position of the air inlet 5 of the shell is provided with a negative pressure fan 6, the negative pressure fan 6 is sleeved with a volute 7, the negative pressure fan 6 is an axial flow fan, the volute 7 is an Archimedes spiral volute, and the air outlet of the volute 7 is perpendicular to the air inlet direction of the negative pressure fan 6 arranged on the air inlet 5 of the shell so as to ensure that an air vortex which is stable enough and covers the space of the whole purification cavity 14 is formed. Simultaneously, the coarse filtration of large-particle harmful substances is carried out on the air entering the equipment by being also equipped with a filter screen as a front coarse filtration system 4 outside the negative pressure fan 6.
An activated carbon filter layer 11 and a physical filter layer 12 which are arranged in a laminating manner are arranged on the right side of a corresponding purification cavity 14 in a closed shell 3, the activated carbon filter layer 11 is positioned on the side of the purification cavity 14 and comprises a honeycomb-shaped filter screen support, two sides of the honeycomb-shaped filter screen support are closed through screen surfaces, honeycomb-shaped activated carbon is formed on the honeycomb-shaped filter screen support to serve as an adsorption unit, and meanwhile, an ionization catalyst for enhancing the ionization effect of ultraviolet rays, an ozone active catalyst for enhancing the activity of ozone and a gas adsorbent for adsorbing harmful gases such as formaldehyde are also added into the activated carbon filter layer 11; and the physical filter layer 12 is arranged outside the activated carbon filter layer 11 and is an H14 high-efficiency filter screen. The physical filter layer 12 and the activated carbon filter layer 11 jointly form a filter unit, and the thickness and the aperture of the filter unit are based on 1/3 that the air flow rate of the air outlet at the air outlet end is the air inlet end to suck the air flow rate when the negative pressure fan 6 is started.
The ultraviolet germicidal lamp 9 is oppositely arranged on the side wall of the two sides of the purifying cavity 14 in the closed shell 3, in the embodiment, the ultraviolet tube adopted by the ultraviolet germicidal lamp 9 outputs ultraviolet light with the wavelength of 253.7nm and the utilization sensitivity of 1 μ w/cm2The ultraviolet illuminometer performs multi-point detection to detect the ultraviolet intensity, and after the ultraviolet germicidal lamp 9 runs stably for 5min, the average value of the ultraviolet radiation intensity of the ultraviolet lamp tube is 1300 mu w/cm2Minimum 1280. mu.w/cm2And completely irradiates the inner side surface of the activated carbon filter layer 11; and the position of the closed shell 3 corresponding to the ultraviolet germicidal lamp 9 is also provided with a detection window 10, the working state of the ultraviolet germicidal lamp 9 is determined by observing the detection windows 10 at the two sides, and the maintenance is reminded when the ultraviolet germicidal lamp 9 works abnormally.
When the indoor placing position is selected by the walking wheels 8 before the air disinfection and purification device is used, in order to achieve the best purification and disinfection effect, the device is placed at the air circulation position, the distance between the inlet air and other objects is not less than 30CM, and the closer the distance to the center of the disinfection and purification space, the higher the disinfection and purification efficiency is; under the condition of definite pollution source, the closer to the pollution source, the more obvious the disinfection and purification effect is. If necessary, the fresh air component can be selected for use. After the position is selected, the walking wheel 8 is fixed and is connected with the external power supply 1 through an external power line connected to the electric cabinet 2 so as to be connected with the power supply. In addition, this embodiment also can be used for the air-out of new trend system to purify, directly link to each other with new trend subassembly under this user state can.
When air in III and IV environments of hospital environment and air in schools, kindergartens, banks, cinemas, offices, families and public places are disinfected, the circulating air quantity is 1200M3H the air disinfection and purification device has the area of 120M2The indoor space is disinfected, the panel on the closed shell 3 is controlled through the electric cabinet 2 to start the negative pressure fan 6 to run, the ultraviolet germicidal lamp 9 is controlled to be cycled every three hours, and the continuous disinfection effect of the environment can be kept by keeping the ultraviolet germicidal lamp 9 on for 15 minutes in each cycle.
When the air disinfection and purification device is used for disinfecting I and II type environments or heavily polluted areas disinfected by ambient air in hospitals in real time, the circulating air quantity is 1200M3H the air disinfection and purification device has the area of 120M2The indoor space is disinfected, the panel on the closed shell 3 is controlled by the electric cabinet 2 to start the negative pressure fan 6, and then the ultraviolet sterilizing lamp 9 is kept normally open, so that real-time sterilization can be carried out.
Because the device adopts the mode of circulating air in the cavity of the purifying cavity 14 to sterilize in the cavity, ultraviolet rays and a small amount of ozone of the ultraviolet sterilizing lamp 9 are matched to irradiate the activated carbon filter layer 11 to generate anion electron cloud to adsorb bacteria and viruses with the particle size less than 0.3 mu m. The physical filter layer 12 uses an H13 high-efficiency filter screen to filter various pollutants with a particle size of more than or equal to 0.3 μm in the air, and can adsorb and purify suspended particulate matters (PM 2.5) in the air and harmful substances such as formaldehyde, benzene, second-hand smoke and the like at the same time of high purification rate.
The latter, which is more environmentally demanding, is used as a test space to verify the air sterilization effect, i.e., the following sterilization test is performed in this type of indoor space using the air sterilization and purification apparatus having the above technical features to verify the air sterilization effect:
in example one, the sterilization control test conditions were:
selecting a class I environment for disinfecting hospital ambient air in an indoor space, wherein the test strain is a natural bacterium;
the ambient temperature is 21 ℃ and the relative humidity is 52 percent;
the culture medium is Tryptone Soy Agar (TSA);
set 20m away from the diagonal position of the device in the indoor space3And placing a six-grade sieve mesh air impact type sampler (KHW-6) in the test space for carrying out sampling test three times.
During sampling, a six-level sieve mesh air impact type sampler is used for sampling (the flow is 28.3L/min) before the test space is disinfected respectively, and the sampling time is 5 min; then, after the device is used for disinfection and sterilization for 120min according to the using method, the six-level sieve mesh air impact type sampler is used again for sampling, and the killing effect is shown in the following table:
therefore, after the equipment is disinfected for 120min, the disinfection rate of the equipment in each test on natural bacteria in the air exceeds 98%, the equipment has strong disinfection performance on the natural bacteria in the air, the continuous disinfection effect of the environment can be kept under the condition that the equipment is continuously started, and the disinfection effect meets the related requirements of 2.1.3 items in technical Specification for disinfection (2002 edition).
In example two, the sterilization control test conditions were:
selecting a heavily polluted area to be treated and polluted in a simulated and manufactured hospital epidemic situation period in an indoor space for carrying out real-time sterilization and purification treatment, wherein a polluted strain in a test area is staphylococcus albus (8032, provided by military medical academy of sciences) third generation, and the bacteria infection mode is that a culture obtained by fresh culture of test bacteria is eluted to prepare a bacterial suspension, the bacterial suspension is diluted to a required concentration, a used device is placed in the polluted area for carrying out air atomization bacteria infection treatment at one time, and a fan is utilized for carrying out space dispersion;
the ambient temperature is 24 ℃ and the relative humidity is 56 percent;
the culture medium is Tryptone Soy Agar (TSA);
setting a control group to compare the natural decay rate of the obtained number of the surviving colonies;
in the indoor spaceSet 20m away from the diagonal position of the device3And placing a six-grade sieve mesh air impact type sampler (KHW-6) in the test space for carrying out sampling test three times.
During sampling, a six-level sieve mesh air impact type sampler is used for sampling (the flow is 28.3L/min) before the test space is disinfected respectively, and the sampling time is 5 min; then, after the device is used for disinfection and sterilization for 120min according to the using method, the six-level sieve mesh air impact type sampler is used again for sampling, and the killing effect is shown in the following table:
therefore, after the equipment is disinfected in a heavily polluted area artificially simulated and manufactured for 120min, the disinfection rate of the equipment for specific strains in each test exceeds 98%, the equipment has strong disinfection performance on white staphylococcus existing in the air, the continuous disinfection effect of the environment can be kept under the condition that the equipment is continuously opened, and the disinfection effect meets the related requirements of 2.1.3 disinfection technical specifications (2002 edition).
Meanwhile, the bacillus subtilis var niger (ATCC 9372) used as a harmful bacteria indicator is measured by the method of the second embodiment, the killing rate is equal to or more than 99.98 percent, and the sterilizing effect is better.
In addition, in the above-mentioned device, because the sterilization factors are all sealed in the purification cavity 14, and the ozone analyzer is used to detect the ozone overflow quantity, in the course of test, the monitored ozone overflow value is in floating state but less than 0.02mg/m3Measuring the irradiation intensity mean value of less than 1 mu w/cm in real time at 30cm position of the outer surface of the device by using an ultraviolet illuminometer2The quantity of the sterilization agent and the sterilization agent is extremely small and controllable, and the human body is not influenced, so that the human-machine coexistence of the sterilization environment can be effectively realized, and the air sterilization problem in a high-temperature and high-humidity area is thoroughly solved; meanwhile, ozone in the device can also radiate the active carbon filter layer 11 to generate negative oxygen ions, and a small amount of negative oxygen ions overflow the equipment and enter flowing air to achieve the effect of refreshing the air.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The air disinfection and purification method is used for disinfecting and purifying indoor air and is characterized in that the indoor air to be purified is introduced into a one-way air channel through a negative pressure fan, a cavity is arranged on the one-way air channel, and the one-way air channel at the rear part of the cavity is sealed through a filtering structure with filtering and adsorbing functions;
generating a proper wind resistance on the filtering structure by adjusting the thickness and the pore size of the filtering structure, forming a flow speed difference between an air inlet end and an air outlet end of the one-way air channel by utilizing the wind pressure generated by the negative pressure fan and the wind resistance on the filtering structure, controlling the flow speed difference to be 1/5-1/2 that the air flow speed of the air outlet at the air outlet end is the air suction speed of the air inlet end, and utilizing the flow speed difference to retain the indoor air entering the cavity at the position of the cavity and enabling the indoor air retained in the cavity to generate air rotational flow;
under the condition of ensuring the sealing performance, negative ions generated by ultraviolet catalysis are utilized to form negative ion cloud under the driving of air rotational flow in the cavity to sterilize indoor air retained in the cavity, bacteria and viruses are adsorbed and agglomerated in the sterilization process by utilizing the adsorption performance of the negative ions, and an agglomerate aerosol with the diameter of more than or equal to 0.3 mu m is formed in the negative ion cloud;
the resulting agglomerate aerosol is adsorbed and filtered at the location of the filter structure.
2. An air disinfection and purification device is characterized by comprising a closed shell, wherein an air inlet and an air outlet are respectively arranged on two open surfaces of the closed shell, a one-way air channel is arranged in the closed shell, and a closed cavity is used as a purification cavity on the one-way air channel;
the air inlet is provided with a negative pressure fan which sucks the outside air into the purification cavity, and the negative pressure fan is embedded on the closed shell to ensure the closing performance;
the air outlet is sealed by the filtering unit, the sealing is guaranteed at the outer side of the filtering unit, and the air pressure in the purifying cavity is controlled by controlling the thickness of the filtering unit and the size of the filtering pores, so that the air flow rate of the air outlet at the air outlet end is 1/5-1/2 of the air suction rate at the air inlet end under the action condition of the negative pressure fan;
an ultraviolet germicidal lamp for continuously ionizing the air in the cavity to generate negative ions is arranged in the purification cavity, and the ultraviolet intensity of the ultraviolet germicidal lamp is more than or equal to 500 mu w/cm2And completely irradiating the surface of the filter unit.
3. The air disinfecting and purifying device of claim 2, wherein the negative pressure fan is an axial flow fan, a volute is sleeved on the axial flow fan, and an air outlet direction of an inner air duct of the volute is perpendicular to an air inlet direction of the axial flow fan.
4. The air sterilization and purification device according to claim 2, wherein the filter unit comprises an activated carbon filter layer on the side of the purification chamber and a physical filter layer arranged outside the activated carbon filter layer.
5. The air sterilization and purification device according to claim 4, wherein the activated carbon filter layer comprises a layer of honeycomb-shaped filter screen bracket, and activated carbon is filled in the honeycomb-shaped filter screen bracket.
6. The air sterilizing and purifying device according to claim 5, wherein one or a combination of an ionization catalyst for enhancing the ionization of ultraviolet rays, an ozone active catalyst for enhancing the activity of ozone, and a gas adsorbent for adsorbing harmful gases such as formaldehyde is added to the activated carbon filter layer.
7. The air disinfection and purification device of claim 4, wherein the physical filter layer is a high-efficiency filter screen with a filter grade of H13 or more.
8. The air disinfection and purification device of claim 2, wherein the air inlet is connected with a pre-coarse filtration system or directly connected with a fresh air system.
9. An air disinfecting and purifying device as recited in claim 2, wherein said air outlet is disposed on the closed casing, and a plurality of sets of air outlet windows facing different directions are disposed on the closed casing at positions corresponding to the air outlet.
10. The air sterilization and purification device according to claim 2, wherein the ultraviolet radiation output from the ultraviolet germicidal lamp has a wavelength of 200 to 280 nm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460730A (en) * | 2020-12-07 | 2021-03-09 | 曹小高 | Sterilizing and disinfecting purifying equipment |
| IT202000018829A1 (en) * | 2020-07-31 | 2022-01-31 | BENETTI Fabrizio DE | IMPROVED DEVICE FOR AIR PURIFICATION. |
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2020
- 2020-04-09 CN CN202010272945.4A patent/CN111306669A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202000018829A1 (en) * | 2020-07-31 | 2022-01-31 | BENETTI Fabrizio DE | IMPROVED DEVICE FOR AIR PURIFICATION. |
| CN112460730A (en) * | 2020-12-07 | 2021-03-09 | 曹小高 | Sterilizing and disinfecting purifying equipment |
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