Flow type air sterilization device

Abstract

The utility model provides a flowing type air sterilization device. The flowing type air sterilization device comprises a first air duct shell, a second air duct shell, a third air duct shell, a fan and a light source assembly, the first air duct shell, the second air duct shell and the third air duct shell are sequentially connected end to end to form a relatively closed air duct; the fan is arranged in the third air duct shell; the light source assembly comprises a first installation support and a plurality of deep ultraviolet point light sources, the deep ultraviolet point light sources are fixed to the first installation support at intervals, and the first installation support is assembled at the end, away from the air inlet, in the first air duct shell. The light-emitting surfaces of the plurality of deep ultraviolet point light sources face the air inlet; a reflecting film is arranged on the inner wall of the first air channel shell, and deep ultraviolet light emitted by the deep ultraviolet point light source is reflected through the reflecting film. According to the utility model, the illumination and uniformity of ultraviolet rays can be improved, and the large-flow sterilization effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of air purification and treatment, and more specifically to a mobile air sterilizing device. Background Art

[0002] Ultraviolet light has the energy to effectively inactivate bacteria and viruses and is a common sterilization method. In recent years, deep ultraviolet LED light sources based on aluminum gallium nitrogen materials have developed rapidly. Deep ultraviolet LED light sources have the advantages of small size, easy installation, energy saving, environmental protection, mercury-free, fast response speed, and high efficiency in sterilization. They are increasingly used in water treatment, air sterilization, food preservation and other fields.

[0003] The UVC band light generated by the deep ultraviolet LED light source has a short wavelength and high energy. It can destroy the molecular structure in the cells of microbial organisms (bacteria, viruses and other pathogens) in a short time, and can prevent the reproduction of microorganisms by destroying their DNA and RNA. It can achieve efficient and rapid broad-spectrum sterilization effect, thereby sterilizing and disinfecting water, air and object surfaces, making it impossible for cells to regenerate.

[0004] However, when using deep ultraviolet LED light sources to sterilize flowing water, it was found that the faster the water flow rate, the less time the bacteria are exposed to deep ultraviolet radiation, resulting in a low dose of deep ultraviolet radiation to the bacteria, thus reducing the sterilization efficiency. The air flow rate is higher, and it is often difficult to achieve effective sterilization by directly irradiating the flowing air with deep ultraviolet LED light sources. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a new flowing air sterilization device in view of the problem that the sterilization effect is poor when the deep ultraviolet LED light source directly irradiates the flowing air.

[0006] The utility model solves the above technical problems by providing a mobile air sterilizing device, comprising a first air duct housing, a second air duct housing, a third air duct housing, a fan and a light source assembly, wherein the radial dimension of the first air duct housing is greater than the radial dimension of the third air duct housing, and the length of the first air duct housing is greater than the sum of the lengths of the second air duct housing and the third air duct housing;

[0007] The first air duct housing, the second air duct housing and the third air duct housing are connected end to end in sequence to form a relatively closed air duct, and the air inlet of the air duct is located at the head end of the first air duct housing, and the air outlet of the air duct is located at the tail end of the third air duct housing; the fan is installed in the third air duct housing and is used to form an airflow from the air inlet to the air outlet in the air duct;

[0008] The light source assembly includes a first mounting bracket and a plurality of deep ultraviolet point light sources, the first mounting bracket having a plurality of grille holes for air flow to pass through, the plurality of deep ultraviolet point light sources are fixed on the first mounting bracket in a mutually spaced manner, and the light-emitting surfaces of the plurality of deep ultraviolet point light sources face the same direction and are respectively perpendicular to the plane where the first mounting bracket is located; the first mounting bracket is assembled at one end of the first air duct shell away from the air inlet, and the light-emitting surfaces of the plurality of deep ultraviolet point light sources face the air inlet; the inner wall of the first air duct shell has a reflective film, and the deep ultraviolet light emitted by the deep ultraviolet point light sources is reflected by the reflective film.

[0009] As a further improvement of the present invention, the first mounting bracket includes a first circular frame and multiple fixing rods, and the multiple fixing rods are fixed in the first circular frame in a parallel manner; the multiple deep ultraviolet point light sources are fixed on the fixing rods in a dot matrix manner.

[0010] As a further improvement of the present invention, the tail end of the first air duct housing has a first flange, the head end of the second air duct housing has a second flange, and the first flange, the second flange and the first circular frame of the first mounting bracket have the same shape and size, and the first air duct housing, the first mounting bracket and the second air duct housing are fixed together by bolts passing through the first flange, the first circular frame and the second flange.

[0011] As a further improvement of the utility model, the fan includes a second mounting bracket;

[0012] The tail end of the second air duct housing has a third flange, the head end of the third air duct housing has a fourth flange, and the outer edges of the third flange, the fourth flange and the second mounting bracket have the same shape and size. The second air duct housing, the fan and the third air duct housing are fixed together by bolts passing through the third flange, the second mounting bracket and the fourth flange.

[0013] As a further improvement of the present invention, the center lines of the first air duct housing, the second air duct housing and the third air duct housing are located on the same straight line, and the area of ​​the air inlet is greater than 10% of the area of ​​the reflective film on the inner wall of the first air duct housing and less than 20% of the area of ​​the reflective film, and the area of ​​the air outlet is less than 5% of the area of ​​the reflective film.

[0014] As a further improvement of the present invention, the reflective film is composed of a layer of ultraviolet high reflective material, and the ultraviolet high reflective material is an optical reflective film or a metal reflective film.

[0015] As a further improvement of the utility model, each of the deep ultraviolet point light sources includes a heat dissipation base, a substrate, and a plurality of LED lamp beads respectively welded on the substrate, the substrate includes a connecting circuit, and the electrode of each of the LED lamp beads is electrically connected to the connecting circuit, and the connecting circuit is electrically connected to an external power supply through a cable.

[0016] As a further improvement of the present invention, the heat dissipation base includes a plurality of heat dissipation fins connected to the substrate through heat pipes, and when the light source assembly is fixed in the air duct, the heat dissipation fins are parallel to the air flow direction in the air duct.

[0017] As a further improvement of the utility model, the light source assembly includes 20 deep ultraviolet point light sources;

[0018] 5×5 LED lamp beads are welded on the substrate of each of the deep ultraviolet point light sources. The wavelength of light emitted by the LED lamp beads is 265nm, and the radiation flux of each LED lamp bead is 72.5mW.

[0019] As a further improvement of the present utility model, the mobile air sterilizing device includes an air filtration module, and the air filtration module includes a second return-shaped frame and an air filter fixed in the second return-shaped frame;

[0020] The first end of the first air duct housing has a fifth flange, and the fifth flange has the same shape and size as the second circular frame. The first air duct housing and the air filter module are fixed together by screws passing through the fifth flange and the second circular frame.

[0021] The utility model has the following beneficial effects: by hanging multiple deep ultraviolet point light sources at one end of the first air duct shell away from the air inlet, and arranging a reflective film on the inner wall of the first air duct shell, the airflow entering the first air duct shell from the air inlet is continuously irradiated by ultraviolet rays in the length direction of the first air duct shell, which greatly improves the illumination and uniformity of ultraviolet rays inside the device, and improves the problem that the existing ultraviolet sterilization device has poor effect when performing large-flow sterilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a mobile air sterilizing device provided in an embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of the exploded structure of the mobile air sterilizing device provided in an embodiment of the utility model.

[0024] Figure 3 It is a schematic cross-sectional structure diagram of a mobile air sterilizing device provided in an embodiment of the utility model.

[0025] Figure 4 It is a structural schematic diagram of a light source assembly in a mobile air sterilizing device provided in an embodiment of the utility model.

[0026] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of part A in the middle.

[0027] Figure 6 It is a schematic cross-sectional structure diagram of the mobile air sterilizing device provided in the comparative example. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] Those skilled in the art should understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in components' functions as the criteria for distinction. As mentioned throughout the specification and claims, "including" is an open term and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0030] In the description of the application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention.

[0031] In the description of this application, unless otherwise clearly specified and limited, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; unless otherwise specified or explained, the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] like Figure 1-3, which is a schematic diagram of a mobile air sterilization device provided by an embodiment of the utility model, the mobile air sterilization device can achieve air sterilization and can be applied to indoor fresh air systems, hospitals, laboratories, pig farms and other places. The mobile air sterilization device of this embodiment includes a first air duct housing 11, a second air duct housing 12, a third air duct housing 13, a light source assembly 15 and a fan 16.

[0033] The first air duct housing 11, the second air duct housing 12, and the third air duct housing 13 can be made of metal materials such as aluminum alloy, stainless steel, or organic materials such as PP, PC, PTFE, and are hollow tubes with openings at both ends. In addition, the side walls of the first air duct housing 11, the second air duct housing 12, and the third air duct housing 13 can be single-layer, multi-layer or sandwich structures, and can withstand a pressure of more than 72pa. The first air duct housing 11, the second air duct housing 12, and the third air duct housing 13 are connected end to end in sequence to form a relatively closed air duct, and the light source assembly 15 and the fan 16 are respectively assembled in the air duct.

[0034] The air duct formed by connecting the first air duct housing 11, the second air duct housing 12 and the third air duct housing 13 end to end in sequence has an air inlet located at the head end of the first air duct housing 11 and an air outlet located at the tail end of the third air duct housing 13. The fan 16 is installed in the third air duct housing 13 and is used to form an airflow from the air inlet to the air outlet in the above-mentioned air duct, that is, when the fan 16 is running, a negative pressure is formed in the first air duct housing 11 and the second air duct housing 12, and a positive pressure is formed in the third air duct housing 13, so that the external air enters the air duct from the head end of the first air duct housing 11 and is discharged from the tail end of the third air duct housing 13.

[0035] Combination Figure 4 As shown, the light source assembly 15 includes a first mounting bracket and a plurality of deep ultraviolet point light sources 153, wherein the first mounting bracket has a plurality of grid holes for airflow to pass through, and the plurality of deep ultraviolet point light sources 153 are fixed on the first mounting bracket in a mutually spaced manner, and the light-emitting surfaces of the plurality of deep ultraviolet point light sources 153 face the same direction and are respectively perpendicular to the plane where the first mounting bracket is located. The first mounting bracket is mounted at one end of the first air duct housing 11 away from the air inlet, and the light-emitting surfaces of the plurality of deep ultraviolet point light sources 153 face the air inlet. In this way, the airflow flowing into the air duct from the air inlet will pass through the grid holes of the light source assembly 15 and flow out of the air duct from the air outlet. At the same time, the light source assembly 15 can irradiate and sterilize the air entering the air duct through the first ultraviolet point light source 153. And because the plurality of first ultraviolet point light sources 153 are suspended in the air duct through the first mounting bracket, not only can more first ultraviolet point light sources 153 be arranged to improve the illumination of the internal ultraviolet rays, but also the uniformity of the ultraviolet rays irradiating the air in the air duct can be greatly improved.

[0036] In order to avoid the loss of ultraviolet energy in the air duct, the inner wall of the first air duct housing 11 is provided with a reflective film, and the deep ultraviolet light emitted by the deep ultraviolet point light source 153 is reflected by the reflective film. In particular, the material of the reflective film can be a material with high ultraviolet reflection, preferably a distributed Bragg reflector (DBR) reflective film deposited on a quartz sheet, and the DBR uses a medium with high and low refractive indexes alternately, and the material can be SiO 2 、AlN、Al 2 O 3 Such as media with low absorption coefficient in the ultraviolet band.

[0037] At the same time, in order to increase the time that the air in the air duct is irradiated with ultraviolet rays, the radial dimension of the first air duct housing 11 is greater than the radial dimension of the third air duct housing 13, and the length of the first air duct housing 11 is greater than the sum of the lengths of the second air duct housing 12 and the third air duct housing 13. Since the second air duct housing 12 is connected between the first air duct housing 11 and the third air duct housing 13 with different radial dimensions, the second air duct housing 12 is a variable diameter structure, that is, the radial dimensions of different axial positions of the second air duct housing 12 are different, and the radial dimension of the head end of the second air duct housing 12 matches the radial dimension of the tail end of the first air duct housing 11, and the radial dimension of the tail end of the second air duct housing 12 matches the radial dimension of the head end of the third air duct housing 13. Through the above structure, the flow speed of the air in the first air duct housing 11 is less than the flow speed of the air in the third air duct housing 13, and the residence time of the air in the first air duct housing 11 is much greater than the residence time in the third air duct housing 13, so that the time that the air is irradiated with ultraviolet rays is relatively increased, thereby improving the sterilization effect.

[0038] The above-mentioned mobile air sterilization device, by suspending multiple deep ultraviolet point light sources on the end of the first air duct shell away from the air inlet, and arranging a reflective film on the inner wall of the first air duct shell, while making the radial dimension of the first air duct shell larger than the radial dimension of the third air duct shell, and the length of the first air duct shell larger than the lengths of the second air duct shell and the third air duct shell, prolongs the time for air to flow in the first air duct shell, so that the airflow entering the first air duct shell from the air inlet is continuously irradiated with ultraviolet rays in the length direction of the first air duct shell, greatly improving the illumination and uniformity of ultraviolet rays inside the device, and improving the problem that the existing ultraviolet sterilization device has poor effect when performing large-flow sterilization.

[0039] Since the light source assembly 15 adopts a plurality of dispersed deep ultraviolet point light sources 153, it can not only prevent heat accumulation during operation, but also when some of the deep ultraviolet point light sources 153 are damaged, only the damaged deep ultraviolet point light sources 153 need to be replaced without replacing the entire light source assembly 15.

[0040] like Figure 4As shown, in one embodiment of the present invention, the first mounting bracket of the light source assembly 15 includes a first return-shaped frame 151 and a plurality of fixing rods 152, and the plurality of fixing rods 152 are fixed in the first return-shaped frame 151 in a mutually parallel manner, and the grid holes on the first mounting bracket can be formed by the gaps between the fixing rods 152. In one embodiment of the present invention, the first return-shaped frame 151 and the fixing rods 152 can be an integral structure, and the two ends of the fixing rods 152 are respectively connected to different sides of the first return-shaped frame 151, so as to improve the connection strength between the fixing rods 152 and the first return-shaped frame 151.

[0041] A plurality of deep ultraviolet point light sources 153 are fixed in a dot matrix manner on the fixing rods 152. Specifically, each deep ultraviolet point light source 153 can be fixed to two adjacent fixing rods 152 respectively (for example, by welding, bolting, etc.), thereby improving the stability of the deep ultraviolet point light source 153 and preventing it from shaking or falling off under the impact of a large airflow, which affects the sterilization effect.

[0042] Combination Figure 4 As shown, each deep ultraviolet point light source 153 includes a heat dissipation base 1534, a substrate 1531, a heat pipe 1533, and a plurality of LED lamp beads 1532 respectively welded on the substrate 1531, wherein the LED lamp beads 1532 are composed of deep ultraviolet LED chips, for example, ultraviolet LED chips with a wavelength of 265nm can be used; the substrate 1531 can be a copper substrate, an aluminum substrate, a ceramic substrate, etc. with good thermal conductivity, so that the heat generated by the LED lamp beads 1532 when emitting light can be quickly conducted away. In addition, a circuit is provided on the substrate 1531, and the electrodes of each LED lamp bead 1532 are electrically connected to the circuit on the substrate 1531, so that the external power supply can supply power to the LED lamp bead 1532 through the cable and the base 1534. In particular, the circuit on the substrate 1531 may include an LED driving circuit.

[0043] The substrate 1531 is connected to the heat dissipation base 1534 through the heat conduction pipe 1533, and the heat of the substrate 1531 is transferred to the heat dissipation base 1534. The heat dissipation base 1534 may be composed of a plurality of heat dissipation fins arranged at intervals, and these heat dissipation fins are respectively parallel to the flow direction of the air in the air duct, thereby minimizing the obstruction to the air flow in the air duct, and at the same time, rapid heat dissipation can be achieved through the air flow in the air duct.

[0044] Through the above structure, the light source assembly 15 has a large radiation flux while being able to keep the LED lamp bead 1532 at a relatively low operating temperature, thereby extending the service life of the LED lamp bead 1532.

[0045] In one embodiment of the utility model, the tail end of the first air duct housing 11 has a first flange 112, the head end of the second air duct housing 12 has a second flange 121, and the first flange 112, the second flange 121 and the first return-shaped frame 151 of the first mounting bracket have the same shape and size, and the first air duct housing 11, the first mounting bracket of the light source assembly 15 and the second air duct housing 12 are fixed together by bolts passing through the first flange 112, the first return-shaped frame 151 and the second flange 121 (correspondingly, the first flange 112, the first return-shaped frame 151 and the second flange 121 respectively have mounting holes).

[0046] Through the above structure, not only the sealing connection between the first air duct housing 11 and the second air duct housing 12 can be achieved, but also the assembly of the light source assembly 15 can be achieved at the same time, which simplifies the assembly of the entire mobile air sterilization device. Of course, in actual applications, the light source assembly 15 can also be assembled into the air duct in other ways.

[0047] In one embodiment of the utility model, the fan 16 includes a second mounting bracket 161. Accordingly, the tail end of the second air duct housing 12 has a third flange 122, the head end of the third air duct housing 13 has a fourth flange 131, and the outer edges of the third flange 122, the fourth flange 131 and the second mounting bracket 161 have the same shape and size, and the second air duct housing 12, the fan 16 and the third air duct housing 13 are fixed together by bolts passing through the third flange 122, the second mounting bracket 161 and the fourth flange 131 (correspondingly, the third flange 122, the second mounting bracket 161 and the fourth flange 131 respectively have mounting holes).

[0048] Through the above structure, not only can the second air duct housing 12 and the third air duct housing 13 be sealed and connected, but also the fan 16 can be assembled at the same time, simplifying the assembly of the entire mobile air sterilizing device. Of course, in actual application, the fan 16 can also be assembled into the air duct by other means.

[0049] In order to enable the mobile air sterilization device to achieve better sterilization effect under large air volume conditions, the center lines of the first air duct housing 11, the second air duct housing 12 and the third air duct housing 13 are located on the same straight line, and the area of ​​the air inlet is larger than 10% of the area of ​​the reflective film on the inner wall of the first air duct housing 11 (for example, when the cross-section of the first air duct housing 11 is rectangular, the area of ​​the reflective film is the sum of the areas of the reflective films on the four inner walls) and less than 20% of the area of ​​the reflective film, and the area of ​​the air outlet is less than 5% of the area of ​​the reflective film.

[0050] In order to prevent dust from entering the air duct and adhering to the surface of the deep ultraviolet point light source 153 to affect its light emission, the mobile air sterilization device further includes an air filter module 14, which includes a second return-shaped frame 141 and an air filter 142 fixed in the second return-shaped frame 141. In particular, the air filter 142 can use polyester fiber filter material, and its filtration efficiency is G3, G4 or M5.

[0051] In order to realize the assembly of the air filter module 14, a fifth flange 113 can be set at the head end of the first air duct housing 11. The fifth flange 113 has the same shape and size as the second return-shaped frame 141 of the air filter module 14, and the first air duct housing 11 and the air filter module 14 are fixed together by screws passing through the fifth flange 113 and the second return-shaped frame 141 (correspondingly, the fifth flange 113 and the second return-shaped frame 141 have mounting holes).

[0052] The following is an example to illustrate the sterilization effect of the above-mentioned mobile air sterilization device.

[0053] Comparative Example 1

[0054] like Figure 6 As shown, in the mobile air sterilization device of the comparative embodiment, the cross-section of the first air duct housing 11 is a rectangular parallelepiped, and its length, width and height are 2000 mm, 1000 mm and 1000 mm respectively. The inner wall of the first air duct housing 11 adopts a distributed Bragg reflector reflective film evaporated on a quartz sheet. Two light source assemblies 15 are respectively arranged at both ends of the first air duct housing 11, and each light source assembly 15 includes 20 deep ultraviolet point light sources (uniformly distributed on the mounting bracket in a 4×5 manner), and each deep ultraviolet point light source includes 25 deep ultraviolet LED chips with a wavelength of 265nm and a radiation flux of 72.5mW (the size of the deep ultraviolet LED chip is 1×1 mm, and is arranged in a 5×5 array). The air volume of the control fan 16 is 10000m 3 / h (The fan 16 can be an axial flow fan or a centrifugal fan, and its air volume can be adjusted by a frequency converter, but its maximum air volume should not be less than 10000m 3 / h), and control the two light source assemblies 15 to respectively turn on 10 groups of deep ultraviolet point light sources.

[0055] Bacteria were continuously sprinkled upstream of the air inlet, and a six-stage mesh air impact sampler was used to sample the air at the air inlet and the air outlet of the mobile air sterilization device. The samples were cultured in a 37°C incubator for 48 hours, and the growing colonies were counted.

[0056] According to the test, the air before sterilization (i.e. the air at the air inlet) contained 2456 bacteria, and the air after sterilization (i.e. after the air is sealed) contained 32 bacteria, and the sterilization rate was 98.70%, of which the air bacteria content (cfu / m 3 ) = total bacterial count on the six-stage sampling plate (cfu) / 28.3L / min×sampling time (min)×1000, sterilization rate = (bacterial content of the air before passing through the sterilization device-bacterial content of the air after passing through the sterilization device) / bacterial content of the air before passing through the sterilization device×100%.

[0057] Comparative Example 2

[0058] The structure of the control flow air sterilization device is as follows Figure 3 As shown, the light source assembly 15 is only provided on the end of the first air duct housing 11 away from the air inlet, and the inner wall of the first air duct housing 11 does not have a reflective film, but only reflects through the material itself (such as stainless steel). The other structures are the same as those in Example 1, and the air volume of the fan 16 is controlled to be 10000m 3 / h, and control the light source assembly 15 to turn on 20 groups of deep ultraviolet point light sources.

[0059] Bacteria were continuously sprinkled upstream of the air inlet, and a six-stage mesh air impact sampler was used to sample the air at the air inlet and the air outlet of the mobile air sterilization device. The samples were cultured in a 37°C incubator for 48 hours, and the growing colonies were counted.

[0060] According to the test, the air before sterilization (i.e. the air at the air inlet) contained 2507 bacteria, and the air after sterilization (i.e. after the air is sealed) contained 252 bacteria, and the sterilization rate was 89.95%, of which the air bacteria content (cfu / m 3 ) = total bacterial count on the six-stage sampling plate (cfu) / 28.3L / min×sampling time (min)×1000, sterilization rate = (bacterial content of the air before passing through the sterilization device-bacterial content of the air after passing through the sterilization device) / bacterial content of the air before passing through the sterilization device×100%.

[0061] Comparative Example 3

[0062] The structure of the mobile air sterilizing device of the comparative example is as follows Figure 3 As shown, only the light source assembly 15 is arranged on the end of the first air duct housing 11 away from the air inlet, and the other structures are the same as those in Example 1. The air volume of the fan 16 is controlled to be 10000m 3 / h, and control the light source assembly 15 to turn on 20 groups of deep ultraviolet point light sources.

[0063] Bacteria were continuously sprinkled upstream of the air inlet, and a six-stage mesh air impact sampler was used to sample the air at the air inlet and the air outlet of the mobile air sterilization device. The samples were cultured in a 37°C incubator for 48 hours, and the growing colonies were counted.

[0064] According to the test, the air before sterilization (i.e. the air at the air inlet) contains 2689 bacteria, and the air after sterilization (i.e. after the air is sealed) contains 2 bacteria, and the sterilization rate is 99.93%, of which the air bacteria content (cfu / m 3 ) = total bacterial count on the six-stage sampling plate (cfu) / 28.3L / min×sampling time (min)×1000, sterilization rate = (bacterial content of the air before passing through the sterilization device-bacterial content of the air after passing through the sterilization device) / bacterial content of the air before passing through the sterilization device×100%.

[0065] Comparative Example 4

[0066] The structure of the mobile air sterilizing device of the comparative example is as follows Figure 3 As shown, only the light source assembly 15 is arranged on the end of the first air duct housing 11 away from the air inlet, and the other structures are the same as those in Example 1. The ventilation volume of the fan is controlled to be 5000m 3 / h, and control the light source assembly 15 to turn on 10 groups of deep ultraviolet point light sources.

[0067] Bacteria were continuously sprinkled upstream of the air inlet, and a six-stage mesh air impact sampler was used to sample the air at the air inlet and the air outlet of the mobile air sterilization device. The samples were cultured in a 37°C incubator for 48 hours, and the growing colonies were counted.

[0068] According to the test, the air before sterilization (i.e. the air at the air inlet) contains 2602 bacteria, and the air after sterilization (i.e. after the air is sealed) contains 1 bacteria, and the sterilization rate is 99.96%, of which the air bacteria content (cfu / m 3 ) = total bacterial count on the six-stage sampling plate (cfu) / 28.3L / min×sampling time (min)×1000, sterilization rate = (bacterial content of the air before passing through the sterilization device-bacterial content of the air after passing through the sterilization device) / bacterial content of the air before passing through the sterilization device×100%.

[0069] According to the above comparative examples 1-4, a light source assembly 15 is arranged at the end of the first air duct housing 11 away from the air inlet and a reflective film is arranged on the inner wall of the first air duct housing 11, so that a good sterilization effect can be achieved even in the case of large air volume.

[0070] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A mobile air sterilization device, characterized in that: The device comprises a first air duct housing, a second air duct housing, a third air duct housing, a fan and a light source assembly, wherein the radial dimension of the first air duct housing is greater than the radial dimension of the third air duct housing, and the length of the first air duct housing is greater than the sum of the lengths of the second air duct housing and the third air duct housing; The first air duct housing, the second air duct housing and the third air duct housing are connected end to end in sequence to form a relatively closed air duct, and the air inlet of the air duct is located at the head end of the first air duct housing, and the air outlet of the air duct is located at the tail end of the third air duct housing; the fan is installed in the third air duct housing and is used to form an airflow from the air inlet to the air outlet in the air duct; The light source assembly includes a first mounting bracket and a plurality of deep ultraviolet point light sources, the first mounting bracket having a plurality of grille holes for air flow to pass through, the plurality of deep ultraviolet point light sources are fixed on the first mounting bracket in a mutually spaced manner, and the light-emitting surfaces of the plurality of deep ultraviolet point light sources face the same direction and are respectively parallel to the plane where the first mounting bracket is located; the first mounting bracket is assembled at one end of the first air duct shell away from the air inlet, and the light-emitting surfaces of the plurality of deep ultraviolet point light sources face the air inlet; the inner wall of the first air duct shell has a reflective film, and the deep ultraviolet light emitted by the deep ultraviolet point light sources is reflected by the reflective film.

2. The mobile air sterilization device according to claim 1, characterized in that: The first mounting bracket includes a first circular frame and a plurality of fixing rods, and the plurality of fixing rods are fixed in the first circular frame in parallel with each other; the plurality of deep ultraviolet point light sources are fixed on the fixing rods in a dot matrix manner.

3. The mobile air sterilizing device according to claim 2, characterized in that: The tail end of the first air duct housing has a first flange, the head end of the second air duct housing has a second flange, and the first flange, the second flange and the first circular frame of the first mounting bracket have the same shape and size, and the first air duct housing, the first mounting bracket and the second air duct housing are fixed together by bolts passing through the first flange, the first circular frame and the second flange.

4. The mobile air sterilization device according to claim 1, characterized in that: The fan includes a second mounting bracket; The tail end of the second air duct housing has a third flange, the head end of the third air duct housing has a fourth flange, and the outer edges of the third flange, the fourth flange and the second mounting bracket have the same shape and size. The second air duct housing, the fan and the third air duct housing are fixed together by bolts passing through the third flange, the second mounting bracket and the fourth flange.

5. The mobile air sterilizing device according to claim 1, characterized in that: The center lines of the first air duct shell, the second air duct shell and the third air duct shell are located on the same straight line, and the area of ​​the air inlet is greater than 10% of the area of ​​the reflective film on the inner wall of the first air duct shell and less than 20% of the area of ​​the reflective film, and the area of ​​the air outlet is less than 5% of the area of ​​the reflective film.

6. The mobile air sterilizing device according to claim 1, characterized in that: The reflective film is composed of a layer of ultraviolet high reflective material, and the ultraviolet high reflective material is an optical reflective film or a metal reflective film.

7. The mobile air sterilizing device according to claim 1, characterized in that: Each of the deep ultraviolet point light sources includes a heat dissipation base, a substrate, and a plurality of LED lamp beads respectively welded on the substrate. The substrate includes a connecting circuit, and an electrode of each of the LED lamp beads is electrically connected to the connecting circuit. The connecting circuit is electrically connected to an external power supply via a cable.

8. The mobile air sterilizing device according to claim 7, characterized in that: The heat dissipation base includes a plurality of heat dissipation fins connected to the base plate through heat conduction pipes, and when the light source assembly is fixed in the air duct, the heat dissipation fins are parallel to the flow direction of the air flow in the air duct.

9. The mobile air sterilizing device according to claim 7, characterized in that: The light source assembly includes 20 deep ultraviolet point light sources; 5×5 LED lamp beads are welded on the substrate of each of the deep ultraviolet point light sources. The wavelength of light emitted by the LED lamp beads is 265nm, and the radiation flux of each LED lamp bead is 72.5mW.

10. The mobile air sterilizing device according to claim 1, characterized in that: The mobile air sterilization device comprises an air filtration module, and the air filtration module comprises a second return-shaped frame and an air filter fixed in the second return-shaped frame; The first end of the first air duct housing has a fifth flange, and the fifth flange has the same shape and size as the second circular frame. The first air duct housing and the air filter module are fixed together by screws passing through the fifth flange and the second circular frame.

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