Cavity type ultraviolet laser virus killing device

Abstract

The invention discloses a cavity type ultraviolet laser virus killing device, and relates to the technical field of virus killing devices in air. The device comprises a shell, a gas inlet channel, a gas outlet channel, an ultraviolet laser system, a gas extraction device, a gas analysis device, a diffuse reflection plate and a transmission grating, wherein the ultraviolet laser system is used for generating tunable ultraviolet light with the wavelength of 200-266nm, the ultraviolet laser system specifically comprises a pump laser, an isolation device, a first total reflective mirror, a crystal, a second total reflective mirror, a frequency doubling assembly and an output coupling mirror, and pump light emitted by the pump laser enters the isolation device. The device is simple in structure, the shell and the laser system which are uniquely designed are matched, the reflecting plate in the shell reflects incident ultraviolet laser for multiple times, the ultraviolet intensity and density in the cavity are enhanced, the virus killing effect is improved, meanwhile, disinfected gas is effectively guided out, continuous purified gas is obtained, and the service life of the device is prolonged. Therefore, the virus gas is effectively controlled.

Description

Technical Field

[0001] The invention relates to the technical field of airborne virus killing devices, and in particular to a cavity-type ultraviolet laser virus killing device. Background Art

[0002] At present, ultraviolet sterilization and disinfection devices are also widely used, among which UVA (wavelength of 400-315nm) and UVB (wavelength of 315-280nm) are the main ones. The ultraviolet bands of UVA and UVB exist in natural light, and the speed of killing viruses is slow. Currently, the UVC (wavelength of 280-200nm) ultraviolet band is rarely used to kill viruses in the air, and the existing virus killers all use ultraviolet lamps for direct disinfection, which has poor uniformity, dead corners, and low utilization rate. In addition, the light source is not blocked and can only be used in spaces where there are no people or other creatures, or when people wear protective equipment, which has poor safety. Summary of the Invention

[0003] The main purpose of the present invention is to provide a cavity-type ultraviolet laser virus killing device to overcome the problems existing in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A cavity-type ultraviolet laser virus killing device comprises a housing, an air inlet, an air outlet, an ultraviolet laser system, a gas extraction device, a gas analysis device, a diffuse reflection plate and a transmission grating;

[0006] The ultraviolet laser system is used to generate tunable ultraviolet light with a wavelength of 200-266nm, and specifically includes a pump laser, an isolation device, a first total reflection mirror, a crystal, a second total reflection mirror, a frequency doubling component and an output coupling mirror. The pump light emitted by the pump laser is incident on the isolation device, the pump light transmitted through the isolation device is incident on the first total reflection mirror, the pump light transmitted through the total reflection mirror is incident on the crystal, the pump light is absorbed by the crystal to generate a first wavelength laser, the first wavelength laser is incident on the second total reflection mirror, the first wavelength laser is totally reflected by the second total reflection mirror and is incident on the frequency doubling component, and after frequency doubling by the frequency doubling component, ultraviolet light of a second wavelength is generated, and the ultraviolet light is output from the output coupling mirror.

[0007] Furthermore, the first total reflection mirror is a total reflection mirror with a critical angle of 0°, the second total reflection mirror is a total reflection mirror with a critical angle of 45°, and the length of the crystal along the direction of light incidence is 15 mm.

[0008] Furthermore, the air inlet is provided at the front end of the shell, and the air outlet is provided at the rear end of the shell. The air inlet and the air outlet are located on opposite sides of the shell and are asymmetrically arranged to prevent the gas from directly forming a flow channel.

[0009] Both the air inlet and the air outlet are provided with shading plates, each of which includes two porous plates, each of which is provided with through holes evenly spaced. The through holes on the two porous plates are staggered to prevent leakage of laser ultraviolet rays in the cavity of the shell.

[0010] Furthermore, the porous plates at the air inlet are respectively the first porous plate and the second porous plate, and the porous plates at the air outlet are respectively the third porous plate and the fourth porous plate, the first porous plate is evenly provided with a plurality of first through holes, and the second porous plate is evenly provided with a plurality of second through holes.

[0011] Furthermore, the air intake duct includes an air supply system for increasing the air intake speed and a valve for controlling the air intake amount, and the valve is controlled by a control system;

[0012] The air outlet duct includes an exhaust system for extracting the purified gas that has been sterilized from the shell.

[0013] Furthermore, the gas extraction device is located at the top of the shell, and the gas extraction device is connected to the gas analysis device. The gas analysis device is used to perform real-time detection on the gas extracted by the gas extraction device, and determine the virus concentration in the gas by analyzing the components in the gas. When the expected target is reached, the control system controls the exhaust system to extract the gas that has been disinfected in the shell.

[0014] Furthermore, a plurality of the diffuse reflection plates are arranged on the inner wall of the shell, and the ultraviolet light is reflected multiple times in the shell by the diffuse reflection plates to perform disinfection.

[0015] Furthermore, the diffuse reflection plate includes a bottom plate and an optical structure arranged on the bottom plate, and the optical structure causes the ultraviolet laser incident thereon to be reflected in an unspecified direction.

[0016] Furthermore, the optical structure includes a plurality of cones arranged at intervals, the side surfaces of the cones include a plurality of discrete protrusions, and the cross-section of each cone is different;

[0017] The cones include triangular pyramids, quadrangular pyramids, pentagonal pyramids and circular pyramids, and the angles of the edges of the triangular pyramids, quadrangular pyramids and pentagonal pyramids with the bottom plate are all different.

[0018] Furthermore, the transmission grating is arranged at the light incident port of the shell, and the ultraviolet light is diffracted by the transmission grating into multiple beams of ultraviolet light propagating in different directions. The line density of the transmission grating is 10,000-12,000 lines / mm, the depth is 1.8 microns, and the duty cycle is 1 / 3.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The cavity-type ultraviolet laser virus killing device of the present invention has a simple structure. Through the cooperation of the uniquely designed shell and laser system, the reflective plate in the shell reflects the incident ultraviolet laser multiple times, thereby enhancing the intensity and density of ultraviolet rays in the cavity and improving the virus killing effect. At the same time, it can effectively discharge the gas after virus killing to obtain a steady stream of purified gas, thereby effectively controlling the virus gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the laser virus killing device of the present invention.

[0022] Figure 2 This is an enlarged view of the air inlet structure of the present invention.

[0023] Figure 3 Schematic diagram of the optical structure of the present invention.

[0024] Figure 4 This is a schematic structural diagram of a laser virus killing device according to Example 2 of the present invention.

[0025] Explanation of the accompanying drawings: shell 1, air inlet duct 2, air outlet duct 3, ultraviolet laser system 4, gas extraction device 5, gas analysis device 6, diffuse reflection plate 7, transmission grating 8, first porous plate 201, second porous plate 202, air supply system 203, third porous plate 301, fourth porous plate 302, exhaust system 303, first through hole 2011, second through hole 2021, bottom plate 702, optical structure 703, protrusion 704. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0027] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present disclosure, these descriptions should not be limited to these terms. These terms are only used to distinguish one from another. For example, the first may also be referred to as the second, and similarly, the second may also be referred to as the first without departing from the scope of the embodiments of the present disclosure.

[0028] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] Combine Figures 1 to 3 This embodiment provides a cavity-type ultraviolet laser virus killing device, including a shell 1, an air inlet 2, an air outlet 3, an ultraviolet laser system 4, a gas extraction device 5, a gas analysis device 6, a diffuse reflection plate 7 and a transmission grating 8.

[0031] Among them, the shell 1 is used to accommodate the gas to be sterilized, the air inlet 2 is arranged at the front end of the shell 1, and the air outlet 3 is arranged at the rear end of the shell 1. The air inlet 2 and the air outlet 3 are located on opposite sides of the shell 1 and are asymmetrically arranged to prevent the gas from directly forming a flow channel and reducing the sterilization effect; the air inlet 2 and the air outlet 3 are both provided with a light shielding plate, and the light shielding plate includes two porous plates, and the porous plates are evenly provided with through holes. The through holes on the two porous plates are staggered with each other to prevent the laser ultraviolet rays in the cavity of the shell 1 from leaking and causing light loss.

[0032] The ultraviolet laser system 4 is used to generate tunable ultraviolet light with a wavelength of 200-266nm, and specifically includes a pump laser, an isolation device, a first total reflection mirror, a crystal, a second total reflection mirror, a frequency doubling component and an output coupling mirror. The pump light emitted by the pump laser is incident on the isolation device, the pump light transmitted by the isolation device is incident on the first total reflection mirror, the pump light transmitted by the total reflection mirror is incident on the crystal, the pump light is absorbed by the crystal to generate a first wavelength laser, the first wavelength laser is incident on the second total reflection mirror, the first wavelength laser is totally reflected by the second total reflection mirror and is incident on the frequency doubling component, which generates ultraviolet light of the second wavelength after frequency doubling by the frequency doubling component, and the ultraviolet light is output from the output coupling mirror.

[0033] The gas extraction device 5 is located at the top of the shell 1. The gas extraction device 5 is connected to the gas analysis device 6. The gas analysis device 6 is used to perform real-time detection on the gas extracted by the gas extraction device 5, and determine the virus concentration in the gas by analyzing the components in the gas. When the expected target is reached, the control system controls the exhaust system 303 to extract the sterilized gas in the shell 1.

[0034] A plurality of diffuse reflection plates 7 are arranged on the inner wall of the housing 1, and the ultraviolet light is reflected multiple times inside the housing 1 by the diffuse reflection plates 7 to sterilize the virus; a transmission grating 8 is arranged at the light incident port of the housing 1, and the ultraviolet light is diffracted by the transmission grating 8 into multiple beams of ultraviolet light propagating in different directions.

[0035] Specifically, the gas extraction device 5 and the gas analysis device 6 together constitute a gas detection device for detecting the gas in the housing.

[0036] Preferably, the first total reflection mirror is a total reflection mirror with a critical angle of 0°, the second total reflection mirror is a total reflection mirror with a critical angle of 45°, and the length of the crystal along the direction of light incidence is 15 mm.

[0037] As a preference, combined Figure 2As shown, the porous plates at the air inlet 2 are respectively the first porous plate 201 and the second porous plate 202, and the porous plates at the air outlet 3 are respectively the third porous plate 301 and the fourth porous plate 302. The first porous plate 201 is evenly provided with a plurality of first through holes 2011, and the second porous plate 202 is evenly provided with a plurality of second through holes 2021.

[0038] In a further embodiment, the air inlet 2 includes an air supply system 203 for increasing the air intake speed and a valve for controlling the air intake volume, which is controlled by a control system. The air outlet 3 includes an exhaust system 303 for extracting the purified air after disinfection from the housing 1. The user can open or close the valve as needed to control the air intake volume.

[0039] As a preference, combined Figure 3 As shown, the diffuse reflection plate 7 includes a bottom plate 702 and an optical structure 703 arranged on the bottom plate. The optical structure 703 reflects the ultraviolet laser incident thereon in an unspecified direction.

[0040] The optical structure 703 includes a plurality of cones arranged at intervals, each with a different cross-section, thereby ensuring that the light input into the cone is reflected in different directions. After multiple reflections in unspecified directions, the light in the shell 1 has sufficient optical density, thereby forming an effective antivirus space. The cones can be discrete, and the interval between the discrete cones is 1-10 mm.

[0041] The side of the cone includes a plurality of discrete irregular protrusions 704, each of which has a different cross-section. The height of the protrusions 704 is less than 1-5 mm. The greater the density of the protrusions 704, the better the light reflection effect. For example, 1000-2000 protrusions / m 2 , the shape of the protrusion 704 can be circular or square.

[0042] The pyramids include triangular, quadrangular, pentagonal, and circular pyramids. The angles of the edges of the triangular, quadrangular, and pentagonal pyramids relative to the base plate are all different. Specifically, the angles range from 0 to 90 degrees, for example, 30 to 60 degrees, allowing the sides of the pyramid to effectively reflect incident light. Experiments have shown that when the angle is 30 to 60 degrees, the optical structure and the housing dimensions (the distance between the reflectors) are coordinated, resulting in the maximum number of reflections of incident light from each reflector.

[0043] Optionally, the diffuse reflection plate 7 includes a molded organic material plate having an irregular surface that causes diffuse reflection of the incident ultraviolet laser, such as a polytetrafluoroethylene molded plate. Experiments have shown that the polytetrafluoroethylene molded plate can achieve uniform diffuse reflection of 222nm ultraviolet light.

[0044] Preferably, the transmission grating 8 has a line density of 10,000-12,000 lines / mm, a depth of 1.8 microns, and a duty cycle of 1 / 3. The transmission grating with the above parameter structure can obtain 10th order diffraction light, ensuring that the density of ultraviolet light is sufficiently high.

[0045] Experimental studies have shown that 222nm ultraviolet light has a more effective killing effect on viruses and can effectively reduce the viral load in aerosols, such as coronaviruses and viral spike proteins.

[0046] As an optional embodiment, specifically, a laser output of 222nm is obtained in the following manner: the pump light emitted by the pump laser is incident on the isolation device, the pump light transmitted through the isolation device is incident on the first total reflection mirror, the first total reflection mirror is a total reflection mirror with a critical angle of 0°, the pump light transmitted through the total reflection mirror is incident on the crystal, the length of the crystal along the direction of light incidence is 15-25mm, the pump light is absorbed by the crystal to generate a first wavelength laser of 888nm, the first wavelength laser is incident on the second total reflection mirror, the second total reflection mirror is a total reflection mirror with a critical angle of 45°; the first wavelength laser totally reflected by the second total reflection mirror is incident on the 4-times frequency doubling component, and after frequency doubling by the frequency doubling component, a second wavelength ultraviolet light of 222nm is generated, and the ultraviolet light is output from the output coupling mirror.

[0047] As an optional embodiment, a laser output of 222nm is obtained by the following method: the pump light emitted by the pump laser is incident on the isolation device, the pump light transmitted through the isolation device is incident on the first total reflection mirror, the first total reflection mirror is a total reflection mirror with a critical angle of 0°, the pump light transmitted through the total reflection mirror is incident on the crystal, the length of the crystal along the direction of light incidence is 15-25mm, the pump light is absorbed by the crystal to generate a first wavelength laser of 1064nm, the first wavelength laser is incident on the second total reflection mirror, the second total reflection mirror is a total reflection mirror with a critical angle of 45°; the first wavelength laser is totally reflected by the second total reflection mirror and is incident on the 4-times-frequency component, and after frequency doubling by the frequency doubling component, a second wavelength ultraviolet light of 266nm is generated, and the ultraviolet light is output from the output coupling mirror.

[0048] The device of the present invention can be installed in ventilation ducts, sealed ducts, air-raid shelters, large war rooms, biochemical defense rooms, infectious disease hospitals and sterile and non-toxic negative pressure work rooms. It can be placed on a trolley or mounted on a wall or in a duct via a hanger.

[0049] The cavity-type ultraviolet laser virus killing device of the present invention has a simple structure. Through the cooperation of the uniquely designed shell and laser system, the reflective plate in the shell reflects the incident ultraviolet laser multiple times, thereby enhancing the intensity and density of ultraviolet rays in the cavity and improving the virus killing effect. At the same time, it can effectively discharge the gas after virus killing to obtain a steady stream of purified gas, thereby effectively controlling the virus gas.

[0050] Example 2

[0051] As another embodiment, as shown in FIG. Figure 4 As shown, a cavity-type ultraviolet laser sterilization device includes a shell 1, a laser 4, a laser power supply 402, and an optical combination lens 5. The front end of the shell 1 is provided with an air inlet 2, and the rear end of the shell 1 is provided with an air outlet 3. The air inlet 2 and the air outlet 3 are located on opposite sides of the shell 1. The rear end of the shell 1 is provided with a laser 4, and the laser emission head 401 of the laser 4 faces the front end of the shell. The laser 4 is connected to the laser power supply 402. An optical combination lens 5 is installed in front of the laser emission head 401 in the shell 1. The front of the optical combination lens 5 is coated with a one-way transparent film 6. The optical combination lens 5 uses a convex lens or a combination of a convex lens, a concave lens, and a plane lens to separate the laser beam into light columns. The diameter of the light column is the same as the diameter of the cavity. A reflector 7 is installed on the inner wall of the front end of the shell 1. The diameter of the reflector 7 is the same as the diameter of the light column.

[0052] Specifically, the ultraviolet light generated by laser 4 is 200-256nm, with adjustable intensity. An induced draft fan is connected to one side of housing 1. The cavity diameter and length of housing 1, laser intensity, and air velocity of air inlet duct 2 are all variables that are adjusted according to usage requirements to ensure sufficient intensity to kill viruses. The laser generates ultraviolet light of 200-256nm. Based on a sterilization time of 1 second, the cavity length of housing 1 should be greater than the air velocity multiplied by 1 second.

[0053] The optical combination lens 5 transforms the UVC band ultraviolet rays emitted by the laser emission head 401 into a light beam, such as Figure 4 As shown, after the UVC band ultraviolet rays reach the reflective plate at the other end of the cavity, they are reflected by the reflective plate 7 to the combined lens coated with a one-way reflective film, and the front of the combined lens is reflected twice and reaches the end reflective film layer again, forming multiple reflections, thereby enhancing the UVC ultraviolet intensity in the shell 1 and enhancing the virus killing effect; the UVC ultraviolet band is in the peak range of virus absorption, and can destroy the nucleic acid reproduction of the DNA or RNA of microorganisms within 1 second, resulting in the breaking of bonds and preventing the microorganisms from replicating themselves, thereby achieving the virus killing effect.

[0054] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A cavity-type ultraviolet laser virus killing device, characterized in that: It comprises a housing (1), an air inlet (2), an air outlet (3), an ultraviolet laser system (4), a gas extraction device (5), a gas analysis device (6), a diffuse reflection plate (7), and a transmission grating (8); The ultraviolet laser system (4) is used to generate tunable ultraviolet light with a wavelength of 200-266 nm, and specifically includes a pump laser, an isolation device, a first total reflection mirror, a crystal, a second total reflection mirror, a frequency doubling component, and an output coupling mirror. The pump light emitted by the pump laser is incident on the isolation device, the pump light transmitted by the isolation device is incident on the first total reflection mirror, the pump light transmitted by the total reflection mirror is incident on the crystal, the pump light is absorbed by the crystal to generate a first wavelength laser, the first wavelength laser is incident on the second total reflection mirror, the first wavelength laser is totally reflected by the second total reflection mirror and is incident on the frequency doubling component, and after frequency doubling by the frequency doubling component, ultraviolet light of a second wavelength is generated, and the ultraviolet light is output from the output coupling mirror.

2. A cavity-type ultraviolet laser virus killing device according to claim 1, characterized in that: The first total reflection mirror is a total reflection mirror with a critical angle of 0°, the second total reflection mirror is a total reflection mirror with a critical angle of 45°, and the length of the crystal along the direction of light incidence is 15 mm.

3. The cavity-type ultraviolet laser virus killing device according to claim 1, characterized in that: The air inlet (2) is arranged at the front end of the shell (1), and the air outlet (3) is arranged at the rear end of the shell (1). The air inlet (2) and the air outlet (3) are located on opposite sides of the shell (1) and are asymmetrically arranged to prevent the gas from directly forming a circulation channel. The air inlet (2) and the air outlet (3) are both provided with light shielding plates, each of which comprises two porous plates, each of which is provided with through holes evenly spaced, and the through holes on the two porous plates are staggered to prevent leakage of laser ultraviolet rays in the cavity of the shell (1).

4. A cavity-type ultraviolet laser virus killing device as claimed in claim 3, characterized in that: The porous plates at the air inlet (2) are respectively a first porous plate (201) and a second porous plate (202); the porous plates at the air outlet (3) are respectively a third porous plate (301) and a fourth porous plate (302); the first porous plate (201) is evenly provided with a plurality of first through holes (2011); and the second porous plate (202) is evenly provided with a plurality of second through holes (2021).

5. The cavity-type ultraviolet laser virus killing device according to claim 3, characterized in that: The air intake duct (2) includes an air supply system (203) for increasing the air intake speed and a valve for controlling the air intake amount, wherein the valve is controlled by a control system; The air outlet duct (3) includes an exhaust system (303) for extracting the purified gas after disinfection from the housing (1).

6. The cavity-type ultraviolet laser virus killing device according to claim 1, characterized in that: The gas extraction device (5) is located at the top of the shell (1). The gas extraction device (5) is connected to the gas analysis device (6). The gas analysis device (6) is used to perform real-time detection on the gas extracted by the gas extraction device (5) and determine the virus concentration in the gas by analyzing the components in the gas. When the expected target is reached, the control system controls the exhaust system (303) to extract the sterilized gas in the shell (1).

7. The cavity-type ultraviolet laser virus killing device according to claim 1, characterized in that: A plurality of the diffuse reflection plates (7) are arranged on the inner wall of the shell (1), and the ultraviolet light is reflected multiple times inside the shell (1) by the diffuse reflection plates (7) to perform disinfection.

8. The cavity-type ultraviolet laser virus killing device according to claim 7, characterized in that: The diffuse reflection plate (7) comprises a bottom plate (702) and an optical structure (703) arranged on the bottom plate, wherein the optical structure (703) causes ultraviolet laser light incident thereon to be reflected in an unspecified direction.

9. The cavity-type ultraviolet laser virus killing device according to claim 8, characterized in that: The optical structure (703) includes a plurality of cones arranged at intervals, the side surfaces of the cones include a plurality of discrete protrusions (704), and the cross-sections of each cone are different; The cones include triangular pyramids, quadrangular pyramids, pentagonal pyramids and circular pyramids, and the angles of the edges of the triangular pyramids, quadrangular pyramids and pentagonal pyramids with the bottom plate are all different.

10. The cavity-type ultraviolet laser virus killing device according to claim 1, characterized in that: The transmission grating (8) is arranged at the light incident port of the housing (1), and the ultraviolet light is diffracted by the transmission grating (8) into multiple beams of ultraviolet light propagating in different directions. The line density of the transmission grating (8) is 10,000-12,000 lines / mm, the depth is 1.8 microns, and the duty cycle is 1 / 3.

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