Multi-physics field sterilization experiment device and sterilization method

Abstract

According to the multi-physical-field sterilization experiment device with the multi-wavelength ultraviolet light and the high-voltage electrostatic field and the sterilization method, the energy utilization rate and the light spot uniformity can be improved by performing collimation light distribution on the UV LED light source; lED light sources with various wavelengths can be integrated on one light source main body, and each wavelength is independently controlled, so that different sterilization experiment requirements can be met. In order to meet the sterilization experiment requirements of strains in multiple physical fields, the device is further provided with a high-voltage electrostatic field unit coupled with the ultraviolet light source device, an electrode wire is optimally designed, and a plurality of parallel metal wires are used as a high-voltage electrode to generate a uniform electric field. According to the sterilization method, the requirement of the system for electric field treatment time can be greatly reduced, the energy consumption of the system is reduced, and the overall inactivation efficiency is improved; the ultraviolet LED light source replaces a traditional mercury lamp, the optimal wavelength cooperating with an electric field can be selected, and the ultraviolet LED light source is free of mercury, green, safe, firm, compact, small in occupied area, free of preheating, long in service life and low in later operation and maintenance cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of biological sterilization, and particularly relates to a multi-physical-field sterilization experimental device and a sterilization method with multi-wavelength ultraviolet light and high-voltage electrostatic field. Background Art

[0002] Bioaerosols are live aerosols containing various microorganisms and active particles, mainly including bacteria, fungi, viruses, dust mites, pollen, and cell debris. Pathogenic bioaerosols from various man-made facilities are found in urban atmospheres, leading to serious bioaerosol pollution and posing potential risks to ecosystems, air quality, and human health. Therefore, more attention is paid to the development of bioaerosol control methods applicable to residential or commercial buildings. The most common control methods include high-efficiency air filtration, ultraviolet germicidal irradiation, chemical reagent spraying, electrostatic precipitation, and combinations of some of these methods. Other technologies still under development include photocatalytic oxidation, ozone oxidation, pulsed light, and plasma disinfection. Currently, high-efficiency particulate air filter systems have become commercial air purifiers in different indoor environments (such as libraries and hospitals). However, the accumulation of bioaerosols intercepted on the surface of these filter media can continue to grow and reproduce under appropriate moisture and nutrients. On the one hand, it poses the hazard of secondary migration of harmful organisms, and on the other hand, the attached microorganisms will clog the filter media. To avoid the spread of pathogens on their surfaces, frequent maintenance and replacement of filters are required, which further increases the operation and equipment costs of the system. Therefore, in order to use the filters safely and continuously, it is necessary to inactivate the microorganisms intercepted on the filter media of the filters.

[0003] Most of the high-efficiency particulate air filters on the market currently use fibers as filter media. Enhancing the electrostatic effect is the most effective way to improve the filtration efficiency of fine particles. The high-voltage electrostatic field enhanced fiber filtration technology combines the characteristics of electrostatic precipitation and fiber filtration, mainly using the method of pre-charging aerosol particles or applying an external electric field to enhance the filtration effect of the fiber layer, achieving the effects of higher filtration efficiency and lower filtration resistance. However, the high-voltage electrostatic field technology has the problem of poor timeliness. Inactivating Escherichia coli usually requires a treatment time of more than thirty minutes, and harmful by-products such as ozone are easily generated during the treatment process.

[0004] Ultraviolet germicidal disinfection is a commonly used inactivation method. The wavelengths of ultraviolet (UV) lamps are usually divided into different types. According to their wavelength ranges and characteristics, they are mainly divided into three types: UVA (320 - 400 nm), UVB (280 - 320 nm), and UVC (100 - 280 nm). The light sources selected by traditional ultraviolet technologies are low-pressure ultraviolet mercury lamps (254 nm) or medium-pressure ultraviolet mercury lamps (200 - 400 nm), which have disadvantages such as fixed and non-adjustable wavelengths, and the light sources are fragile and contain mercury. The new light source, light-emitting diode (UV LED), can be designed as a radiation source in a specific wavelength range to meet specific application requirements. However, the conventional practice is just to simply arrange independent-wavelength UV LED light sources to make a light source fixture, without professional optical light distribution design and electrical control.

[0005] It can be seen that the application of a single technology in protective engineering has certain application problems. The existing technologies have characteristics of high maintenance costs, high environmental risks, and low reliability in intercepting microorganisms on the surface of the inactivation air filter media. There is a need to develop an economical, efficient, and stable technology to rapidly kill the microorganisms intercepted on the surface of the filter media in real-time and online. By jointly acting on microorganisms through multiple physical fields, the balance of microorganism growth can be broken from multiple targets, and at the same time, the dosage requirements for a single technology of the treatment system can be reduced, thereby avoiding the adverse effects caused by the high load of the equipment on energy consumption, the environment, personnel, etc. Summary of the Invention

[0006] (1) Technical problems to be solved

[0007] The present invention proposes a sterilization experiment device with multi-wavelength ultraviolet light and high-voltage electrostatic field to solve the technical problem of how to jointly and synergistically apply two technologies, ultraviolet and high-voltage electrostatic field, to the microorganism sterilization experiment, break the balance of microorganism growth in multiple aspects, and at the same time reduce the dosage requirements of the treatment system for a single technology, thereby avoiding the adverse effects caused by the high load of the equipment on energy consumption, the environment, personnel, etc., and providing a theoretical support for the design of a new type of high-efficiency particulate filter.

[0008] (2) Technical solutions

[0009] To solve the above technical problems, the present invention proposes a multi-physical-field sterilization experiment device. This multi-physical-field sterilization experiment device has multi-wavelength ultraviolet light and high-voltage electrostatic field, and includes a light source drive control unit, a UV LED light source main body, a negative high-voltage DC power supply, a fixed base, an insulating board, a bacterial strain coating and grounding electrode plate, an electrode wire fixing frame, and a light source main body mounting bracket; among them,

[0010] The surface of the fixed base is processed with fixed grooves, in which insulating plates are installed. The surface of the insulating plates is installed with a strain coating and grounding electrode plate. The surface of the strain coating and grounding electrode plate is processed with a plurality of sample grooves for spraying biological aerosols containing strains. An electrode wire fixing frame is installed on the outer periphery of the strain coating and grounding electrode plate. A plurality of electric field lines connected to a negative high-voltage DC power supply through negative high-voltage power output lines are installed on the top of the electrode wire fixing frame to provide a high-voltage electrostatic field for the strains in the biological aerosol and sterilize the strains in the biological aerosol coated in the sample grooves. The strain coating and grounding electrode plate is connected with a negative high-voltage power supply ground wire.

[0011] On the left and right sides of the surface of the fixed base, light source main body mounting brackets are respectively installed. The UV LED light source main body is fixedly connected to a cross beam and fixedly installed on the two light source main body mounting brackets through fasteners at both ends of the cross beam. The UV LED light source main body is used to irradiate ultraviolet light into the corresponding sample grooves under the control of a light source drive control unit to sterilize the strains in the biological aerosol coated in the sample grooves.

[0012] Further, the electric field intensity received by the sample grooves under each electric field line is the same.

[0013] Further, three electric field lines are installed on the top of the electrode wire fixing frame.

[0014] Further, the light source main body mounting bracket adopts a graduated round tube, and the UV LED light source main body can move vertically on the light source main body mounting bracket to adjust to the irradiation height required for the sterilization experiment.

[0015] Further, the UV LED light source main body includes a UV LED radiator, a UV LED copper substrate, UV LED lamp beads, a lens base, lenses and a lens cover plate. Among them, the UV LED copper substrate is installed on the top of the lens base, and the UV LED radiator fixed to the top of the lens base is arranged on the top of the UV LED copper substrate. A plurality of light passing holes are processed on the lens base, and a plurality of UV LED lamp beads corresponding to the light passing holes are installed on the UV LED copper substrate. The UV LED lamp beads are connected to the light source drive control unit, and the working parameters of each UV LED lamp bead are controlled by the light source drive control unit. A lens is installed at the bottom of each light passing hole, and the plurality of lenses and the lens base are fixedly connected through the lens cover plate. The UV light emitted by the UV LED lamp beads is collimated through the lenses, so that the light spots emitted from each light passing hole do not interfere with each other, and an illumination area with uniform light spots is obtained to ensure that the illuminance at each point remains consistent. The heat generated by the UV LED lamp beads is dissipated into the air through the UV LED copper substrate via the UV LED radiator. The ultraviolet light of the UV LED lamp beads irradiates into the corresponding sample grooves to sterilize the strains in the biological aerosol coated in the sample grooves.

[0016] Furthermore, there are two sets of UV LED light source bodies in total. Each set is processed with two rows and three columns of six light-transmitting holes, for a total of twelve light-transmitting holes. The peak wavelengths of the UV LED beads installed in the four rows of light-transmitting holes are 265nm, 280nm, 300nm, and 365nm respectively.

[0017] In addition, the present invention also proposes a multi-physical-field sterilization method, which simultaneously uses ultraviolet light and high-voltage electrostatic field to sterilize the strains in bioaerosol.

[0018] Furthermore, using the above multi-physical-field sterilization experimental device, the strains in bioaerosol are sterilized by the combined action of electric field and ultraviolet light.

[0019] (III) Beneficial effects

[0020] The present invention proposes a multi-physical-field sterilization experimental device and a sterilization method with multi-wavelength ultraviolet light and high-voltage electrostatic field. The sterilization experimental device includes a light source drive control unit, a UV LED light source body, a negative high-voltage DC power supply, a fixed base, an insulating board, a strain coating and grounding electrode plate, an electrode wire fixing frame, and a light source body mounting bracket. By collimating and distributing the light of the UVLED light source, the present invention can improve the energy utilization rate and the uniformity of the light spot; a variety of wavelength LED light sources can be integrated on one light source body, and each wavelength is independently controlled, which can meet different sterilization experiment requirements. To meet the sterilization experiment requirements of strains under multi-physical fields, the device is also equipped with a high-voltage electrostatic field unit coupled with the ultraviolet light source device, and the electrode wires are optimized. A uniform electric field is generated by multiple parallel metal wires as high-voltage electrodes. The sterilization method of the present invention can greatly reduce the system's demand for electric field treatment time, reduce the system's energy consumption, and improve the overall inactivation efficiency; the ultraviolet LED light source replaces the traditional mercury lamp, and the best wavelength for synergistic action with the electric field can be selected. It is mercury-free, green and safe, firm, compact, occupies a small area, does not require preheating, has a long service life, and has low later operation and maintenance costs. Description of the drawings

[0021] Figure 1 It is a schematic diagram of the overall structure of the sterilization experimental device of the present invention;

[0022] Figure 2 It is a 3D distribution diagram of the electric field strength in the present invention;

[0023] Figure 3a It is a schematic diagram of the overall UV LED light source body in the sterilization experimental device of the present invention, Figure 3b It is a cross-sectional view;

[0024] Figure 4 It is an effect diagram of the light spot emitted by the UV LED bead with a wavelength of 365nm in the present invention;

[0025] Figure 5 This is the multi-physical-field sterilization data graph in the present invention.

[0026] In the figure: 1. Light source drive control unit, 2. UV LED light source main body, 3. Negative high-voltage DC power supply, 4. Fixed base, 5. Insulating plate, 6. Bacterial strain coating and grounding electrode plate, 7. Electrode wire fixing frame, 8. Light source main body mounting bracket, 2-1. UV LED radiator, 2-2. UV LED copper substrate, 2-3. UV LED lamp beads, 2-4. Lens base, 2-5. Lens, 2-6. Lens cover plate. Detailed implementation manners

[0027] To make the objectives, contents and advantages of the present invention clearer, the following further describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings and embodiments.

[0028] This embodiment provides a multi-physical-field sterilization experimental device with multi-wavelength ultraviolet light and high-voltage electrostatic field, and its overall structure is as Figure 1 shown, mainly including a light source drive control unit 1, a UV LED light source main body 2, a negative high-voltage DC power supply 3, a fixed base 4, an insulating plate 5, a bacterial strain coating and grounding electrode plate 6, an electrode wire fixing frame 7 and a light source main body mounting bracket 8.

[0029] A fixing groove is machined in the middle of the surface of the fixed base 4, the insulating plate 5 is installed in the fixing groove, the bacterial strain coating and grounding electrode plate 6 is installed on the surface of the insulating plate 5, and a plurality of sample grooves are machined on the surface of the bacterial strain coating and grounding electrode plate 6. When performing the sterilization experiment, the biological aerosol containing bacterial strains is sprayed into the sample grooves. An electrode wire fixing frame 7 is installed on the outer periphery of the bacterial strain coating and grounding electrode plate 6, and three electric field lines 11 connected to the negative high-voltage DC power supply 3 through the negative high-voltage power output line 9 are installed on the top of the electrode wire fixing frame 7 for providing a high-voltage electrostatic field to the bacterial strains in the biological aerosol, and the bacterial strain coating and grounding electrode plate 6 is connected with a negative high-voltage power ground wire 10. As Figure 2 shown, the electric field intensity received by the sample grooves below each electric field line is the same.

[0030] Light source main body mounting brackets 8 are respectively installed on the left and right sides of the surface of the fixed base 4. The UV LED light source main body 2 is fixedly connected to the cross beam and is fixedly installed on the two light source main body mounting brackets 8 through fasteners at both ends of the cross beam. The light source main body mounting bracket 8 adopts a graduated round tube, and the UV LED light source main body 2 can vertically move on the light source main body mounting bracket 8 to adjust to the irradiation height required for the sterilization experiment.

[0031] As Figure 3a and 3bAs shown in the figure, the UV LED light source body 2 includes a UV LED radiator 2-1, a UV LED copper substrate 2-2, UV LED lamp beads 2-3, a lens base 2-4, a lens 2-5, and a lens cover plate 2-6. Among them, the UV LED copper substrate 2-2 is installed on the top of the lens base 2-4, and the UV LED radiator 2-1 fixed on the top of the lens base 2-4 is arranged on the top of the UV LED copper substrate 2-2. A plurality of light passing holes are machined on the lens base 2-4, and a plurality of UV LED lamp beads 2-3 corresponding to the light passing holes are installed on the UV LED copper substrate 2-2. The UV LED lamp beads 2-3 are connected to the light source drive control unit 1, and the light source drive control unit 1 controls the working parameters such as the on / off, irradiation time, and energy of each UV LED lamp bead 2-3. A lens 2-5 is installed at the bottom of each light passing hole, and the plurality of lenses 2-5 and the lens base 2-4 are fixedly connected through the lens cover plate 2-6. The UV light emitted by the UV LED lamp beads 2-3 is collimated through the lens 2-5, so that the light spots emitted from each light passing hole do not interfere with each other, and an illumination area with uniform light spots is obtained, ensuring that the illuminance at each point is consistent. The heat generated by the UV LED lamp beads 2-3 is dissipated into the air through the UV LED copper substrate 2-2 via the UV LED radiator 2-1 to ensure the service life of the UV LED lamp beads 2-3. The ultraviolet light of the UV LED lamp beads 2-3 irradiates into the corresponding sample tank to sterilize the bacteria in the biological aerosol coated in the sample tank.

[0032] The sterilization experiment device of the present invention is mainly applied to study the changes of microbial bacteria under different UV light irradiations and electric field intensities. In this embodiment, there are two sets of UV LED light source bodies 2 in total. Each set is machined with two rows and three columns of a total of six light passing holes, a total of twelve light passing holes. The peak wavelengths of the UV LED lamp beads 2-3 installed in the four rows of light passing holes are 265nm, 280nm, 300nm, and 365nm respectively. The light source drive controller unit 1 drives the UV LED lamp beads 2-3 to light up, and the uniform irradiation light spots emitted by the UV LED lamp beads 2-3 of each light passing hole are as Figure 4 shown.

[0033] Using the multi-physical field sterilization experiment device with multi-wavelength ultraviolet light and high-voltage electrostatic field of the present invention, multi-physical field sterilization combining electric field and ultraviolet is carried out. The UV LED light source replaces the traditional ultraviolet mercury lamp, and the optimal UV LED dose and electric field treatment time can be screened through systematic experiments. Taking the typical microorganism Escherichia coli as the indicator organism, the principle and advantages of the present invention are illustrated. The Escherichia coli aerosol is coated on the sample tank of the strain coating and grounding electrode plate 6, and at the same time, the UV LED light source and the electric field are turned on to inactivate Escherichia coli with an initial concentration of 3.6*10 8 CFU / ml, and the ultraviolet dose is 1.8mJ / cm 2, the average radiation intensity is 0.03 mW / cm 2 For a 280 nm UV LED with 2 , the electric field voltage is -12.5 kV, and the treatment time is 1 min, which can reduce Escherichia coli by 4 logs, and the inactivation efficiency reaches 99.99%.

[0034] Figure 5 It is a comparison chart of the logarithmic inactivation rate of Escherichia coli by a multi-physical field sterilization device and the sterilization effect of a single physical field. From the perspective of the sterilization effect, the inactivation effect of the synergistic action of the electric field and ultraviolet is much higher than the sum of the values of the electric field and ultraviolet acting alone, indicating that the multi-physical field sterilization combining the electric field and ultraviolet can produce a synergistic effect, realizing an inactivation method with high efficiency and low energy consumption for intercepting microorganisms on the surface of the filter material.

[0035] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A multi-physical field sterilization experimental device, characterized in that The multi-physical-field sterilization experimental device has multi-wavelength ultraviolet light and a high-voltage electrostatic field, and includes a light source drive control unit, a UV LED light source body, a negative high-voltage DC power supply, a fixed base, an insulating board, a bacterial strain coating and grounding electrode plate, an electrode wire fixing frame, and a light source body mounting bracket; among them, The surface of the fixed base is processed with a fixed groove, in which an insulating board is installed. The surface of the insulating board is installed with a bacterial strain coating and grounding electrode plate. The surface of the bacterial strain coating and grounding electrode plate is processed with a plurality of sample grooves for spraying biological aerosols containing bacterial strains. An electrode wire fixing frame is installed on the outer periphery of the bacterial strain coating and grounding electrode plate. Multiple electric field lines connected to the negative high-voltage DC power supply through negative high-voltage power output lines are installed on the top of the electrode wire fixing frame to provide a high-voltage electrostatic field to the bacterial strains in the biological aerosol and sterilize the bacterial strains in the biological aerosol coated in the sample grooves; the bacterial strain coating and grounding electrode plate is connected with a negative high-voltage power supply ground wire; Light source body mounting brackets are respectively installed on the left and right sides of the surface of the fixed base. The UV LED light source body is fixedly connected to a cross beam and fixedly installed on the two light source body mounting brackets through fasteners at both ends of the cross beam. The UV LED light source body is used to irradiate ultraviolet light into the corresponding sample grooves under the control of the light source drive control unit to sterilize the bacterial strains in the biological aerosol coated in the sample grooves.

2. The multi-physical-field sterilization experiment device according to claim 1, wherein, The electric field intensity received by the sample grooves below each electric field line is the same.

3. The multi-physical-field sterilization experimental device according to claim 1, characterized in that, Three electric field lines are installed on the top of the electrode wire fixing frame.

4. The multi-physical-field sterilization experimental device according to claim 1, characterized in that, The light source body mounting bracket adopts a graduated round tube, and the UV LED light source body can move vertically on the light source body mounting bracket to adjust to the irradiation height required for the sterilization experiment.

5. The multi-physical-field sterilization experiment device according to claim 1, wherein, The UV LED light source body includes a UV LED radiator, a UV LED copper substrate, UV LED lamp beads, a lens base, a lens, and a lens cover plate; among them, the UV LED copper substrate is installed on the top of the lens base, and the UV LED radiator fixed to the top of the lens base is arranged on the top of the UV LED copper substrate; a plurality of light passing holes are processed on the lens base, and a plurality of UV LED lamp beads corresponding to the light passing holes are installed on the UV LED copper substrate. The UV LED lamp beads are connected to the light source drive control unit, and the working parameters of each UV LED lamp bead are controlled by the light source drive control unit; a lens is installed at the bottom of each light passing hole, and the plurality of lenses and the lens base are fixedly connected through the lens cover plate. The UV light emitted by the UV LED lamp beads is collimated through the lens, so that the light spots emitted from each light passing hole do not interfere with each other, and a lighting area with uniform light spots is obtained to ensure that the illuminance at each point remains consistent; the heat generated by the UV LED lamp beads is dissipated into the air through the UV LED copper substrate via the UV LED radiator; the ultraviolet light of the UV LED lamp beads is irradiated into the corresponding sample grooves to sterilize the bacterial strains in the biological aerosol coated in the sample grooves.

6. The multi-physical-field sterilization experiment device according to claim 1, characterized in that There are two sets of UV LED light source bodies in total. Each set is processed with two rows and three columns of six light-passing holes, for a total of twelve light-passing holes. The peak wavelengths of the UV LED beads installed in the four rows of light-passing holes are 265nm, 280nm, 300nm, and 365nm respectively.

7. A multi-physical-field sterilization method, characterized in that, The multi-physical field sterilization method simultaneously uses ultraviolet light and high-voltage electrostatic field to sterilize the bacteria in bioaerosols.

8. The multi-physical-field sterilization method according to claim 7, characterized in that, Using the multi-physical field sterilization experimental device described in any one of claims 1 to 6, the bacteria in bioaerosols are sterilized by combining an electric field and ultraviolet light.

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