Photocatalytic air purification device

Abstract

The utility model provides a kind of photocatalytic air purification device, since its filter assembly includes light source, photocatalytic filter component and light leakage protection filter component, light leakage protection filter component is set in the front of light source and is made of porous material, therefore can be able to absorb or scatter excitation light by the air hole in light leakage protection filter component, realize the interruption to excitation light, to reduce or prevent excitation light leakage, play the protection effect to human body. Since light leakage prevention is realized by light leakage protection filter component, therefore it is unnecessary to reduce air inlet, the number of air inlet or reduce its opening size, and it is also unnecessary to design air passage structure to make air detour, so sufficient air permeation flow can be guaranteed, and efficient air purification effect can be guaranteed. At the same time, compared with the existing photocatalytic air purification device, only light leakage protection filter component is added in the device of the utility model, so the complication of photocatalytic air purification device structure is also avoided.

Description

Technical Field

[0001] This utility model relates to a photocatalytic air purification device for air purification, specifically a photocatalytic air purification device that ensures sufficient circulating air volume and has a function to prevent excitation light leakage. Background Technology

[0002] Traditionally, various air purifiers based on the high oxidizing power of photocatalysts have been put into practical use. The applications of photocatalytic air purifiers include: removing harmful substances such as formaldehyde, removing malodorous substances such as ammonia, removing bacteria and viruses that are harmful to medical use, and removing ethylene, a ripening gas, to maintain the freshness of fruits and vegetables. In these air purifiers, a light source with sufficient light intensity is needed to efficiently decompose and remove target pollutants, thus fully activating the photocatalyst.

[0003] A typical photocatalytic air purifier consists of a housing, a fan, a light source, and a photocatalytic filter, and may be equipped with a pre-filter to remove particulate matter and a HEPA filter to remove fine particles, depending on the requirements. In a photocatalytic air purifier, these components are connected in series. Since the photocatalytic filter and pre-filter are transparent, leakage of the excitation light can become a problem in conventional designs.

[0004] Figure 5 and Figure 6 Schematic diagrams of the structures of rear-exhaust photocatalytic air purifiers and front-exhaust photocatalytic air purifiers in the prior art are shown respectively, as follows: Figure 5 and Figure 6 As shown, existing photocatalytic air purifiers can be roughly divided into two types: one is... Figure 5 The rear-exhaust type shown here draws in air from the front of the filter, purifies it, and then exhausts it from the back of the entire unit. Another type is... Figure 6 The front-exhaust type shown draws in air from the back of the filter, purifies it, and then exhausts it from the front of the unit. Both types of photocatalytic air purifiers have similar basic structures; the following explanation will use the rear-exhaust type as an example.

[0005] like Figure 5As shown, the rear-exit photocatalytic air purifier 80 includes a housing 81, a light source 82, and a photocatalytic filter component 83. The housing 81 has multiple air inlets 811 on the front and multiple air outlets 812 on the back. Both the light source 82 and the photocatalytic filter component 83 are disposed within the housing 81. The photocatalytic filter component 83 is positioned on the side of the housing 81 closer to the air inlets 811, while the light source 82 is positioned closer to the air outlets 812 than the photocatalytic filter component 83, and illuminates the photocatalytic filter component 83. Optionally, a pre-filter component for removing pollutant particles from the intake side and a high-efficiency particulate air (HEPA) filter component for removing fine particles can also be added to the device. In use, the light source 82 irradiates the photocatalytic filter component 83 to generate a photocatalytic reaction. External air enters the housing 81 through the air inlets 811, is filtered by the photocatalytic filter component 83, and becomes purified air. The purified air is then discharged to the outside of the device through the air outlets 812.

[0006] Generally, the aforementioned photocatalytic filtering components and pre-filtering components are made of light-transmitting materials. As shown in the figure, after the excitation light generated by the light source 82 penetrates these components, some of the laser light leaks to the outside through the air inlet 811. This light leakage affects the efficiency of the photocatalytic reaction. Even if the light transmittance of these components is reduced, the light leakage prevention rate is not ideal. Furthermore, these components are assembled inside the housing 81. To ensure sufficient airflow through the air outlet 812 of the housing 81, the air outlet 812 also needs to have a certain opening size, which also contributes to the less-than-ideal light leakage prevention rate. Figure 6 As shown, the front-exit type photocatalytic air purifier 90 includes a housing 91 with an air inlet 911 and an air outlet 912, a light source 92, and a photocatalytic filter component 93. Its structure is similar to that of the rear-exit type photocatalytic air purifier 80, and therefore it also has the same problem.

[0007] Therefore, both of the existing photocatalytic air purifiers have the problem of light leakage, which may cause harm to the human body.

[0008] Specifically, the wavelengths of the light sources in photocatalyst air purifiers can be broadly categorized into ultraviolet (UV) and visible light. Regarding UV light, taking titanium dioxide, a representative photocatalyst material, as an example, wavelengths below 388 nm and 413 nm are used for anatase and rutile crystals, respectively. In air purifiers, examples of light sources for photocatalyst excitation include UV lamps that emit light through excitation by encapsulated mercury vapor, and black lamps that use phosphors to convert the wavelength of UV light from mercury. Furthermore, LEDs (Light Emitting Diodes), which emit light in the UV region, are also used as excitation sources.

[0009] Ultraviolet radiation is classified into UV-A (315–400 nm), UV-B (280–315 nm), and UV-C (100–280 nm) based on its wavelength. UV-A mainly damages the skin, UV-B mainly causes eye inflammation, and some studies have indicated that its damage to skin cancer is also worrying, while UV-C can damage the DNA in organisms.

[0010] Because ultraviolet (UV) radiation can cause the aforementioned damage, preventing UV leakage is an important issue in photocatalytic air purifiers. Guidelines have been developed for devices using these light sources to prevent hazards. For example, the U.S. Conference of Industrial Hygiene Experts sets an upper limit of 1000 μW / cm² for UV-A radiation. 2 .

[0011] In addition, photocatalytic light sources generally emit not only ultraviolet light but also visible light. Among these visible lights, especially those with wavelengths of 380–500 nm, which are called blue light, studies have shown that they may cause various eye damages, including age-related macular degeneration.

[0012] Regarding blue light, although there are no clear permissible standards yet, it is generally required that the light source intensity of various devices be reduced by 25% to 40%.

[0013] On the other hand, in photocatalytic air purifiers, it is necessary to ensure sufficient circulating airflow for efficient air purification. The required circulating airflow varies depending on factors such as room size and the types of pollutants to be removed, but typically requires approximately 0.3 m³ / s. 3 / min~3m 3 / min of circulating air volume.

[0014] Figure 7 This is a schematic diagram of a photocatalytic air purifier with a meandering airflow channel, as described in existing technology. Figure 7 As shown, to avoid light leakage, a photocatalytic air purifier 70 with a meandering airflow channel is also available in the prior art. It includes a housing 71, a light source 72, and a photocatalytic filter component 73. The front of the housing 71 has one or more air inlets 711, and the back of the housing 72 has multiple air outlets 712. Its structure is similar to the rear-exit type photocatalytic air purifier 80, except that the air inlets 711 are located at the bottom of the housing 71, making the airflow path within the housing 71 meander, thereby reducing light leakage. However, such a structure brings problems such as flow loss in the airflow path, uneven flow path, and increased device complexity.

[0015] In summary, photocatalytic air purifiers must ensure sufficient light intensity to excite the photocatalyst, prevent light leakage, and guarantee adequate airflow. Furthermore, complex equipment structures must be avoided. However, traditional photocatalytic air purifiers do not yet possess the capability to simultaneously meet all these requirements, reduce ultraviolet light leakage to a safe level, and achieve highly efficient air purification. Utility Model Content

[0016] This invention addresses the aforementioned problems by providing a photocatalytic air purification device that ensures sufficient excitation light intensity, effectively prevents excitation light leakage, guarantees adequate airflow, and has a simplified structure. The technical solution adopted by this invention is as follows:

[0017] This invention provides a photocatalytic air purification device, which includes: a housing having an air inlet and an air outlet for allowing air to enter and for allowing purified air to exit, respectively; and a filter assembly disposed between the air outlet and the air inlet for filtering the incoming air, wherein the filter assembly includes: one or more photocatalytic filter elements; a light source for generating excitation light to irradiate the photocatalytic filter elements, causing the photocatalytic filter elements to undergo a photocatalytic reaction with the passing air; and a light leakage protection filter element disposed in front of the light source, made of a porous material, for allowing air to pass through and absorbing or scattering the excitation light, thereby reducing or preventing the leakage of the excitation light.

[0018] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the light leakage protection filter component has a plurality of connecting holes that connect the two surfaces of the component in the thickness direction. The connecting holes are non-through holes, which prevent the excitation light from passing directly through the thickness direction of the light leakage protection filter component.

[0019] The photocatalytic air purification device provided by this utility model may also have the following technical features: the extension direction of the connecting hole is inclined relative to the thickness direction of the light leakage protection filter component, or it has at least one bend or fold.

[0020] The photocatalytic air purification device provided by this utility model may also have the following technical features: the air inlet and the air outlet are respectively arranged on both sides of the housing; the light source, the photocatalytic filter component, and the light leakage protection filter component are arranged in sequence; and there are gaps between the light source and the photocatalytic filter component, and between the photocatalytic filter component and the light leakage protection filter component.

[0021] The photocatalytic air purification device provided by this utility model may also have the following technical features, wherein the light leakage protection filter component is any one of polymer foam products, glass fiber braided body, and high-efficiency air particulate filter.

[0022] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the light leakage protection filter component is any one of colored polymer foam products, colored glass fiber braids, and colored high-efficiency air particulate filters.

[0023] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the polymer foam product is any one of polyurethane film, polyethylene film, and polypropylene film.

[0024] The photocatalytic air purification device provided by this utility model may also have the following technical features: the mesh number of the polymer foam product is 7 PPI to 60 PPI, and the thickness is 10 mm to 20 mm.

[0025] The photocatalytic air purification device provided by this utility model may also have the following technical features: the excitation light generated by the light source includes light in the ultraviolet region, and the light leakage protection filter component ensures that the intensity of the leaked light does not exceed 1000 μW / cm2 in the ultraviolet region.

[0026] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the light leakage protection filter component ensures that the intensity of the leaked light does not exceed 500 μW / cm² in the ultraviolet region. 2 .

[0027] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the light leakage protection filter component ensures that the intensity of the leaked light does not exceed 100 μW / cm² in the ultraviolet region. 2 .

[0028] The photocatalytic air purification device provided by this utility model may also have the following technical features: the excitation light generated by the light source includes light in the visible light region, and the light leakage protection filter component causes the light in the visible light region to be attenuated by more than 45% after passing through the light leakage protection filter component.

[0029] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the light leakage protection filter component causes the light in the visible light region to be attenuated by more than 30% after passing through the light leakage protection filter component.

[0030] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the light leakage protection filter component causes the light in the visible light region to be attenuated by more than 20% after passing through the light leakage protection filter component.

[0031] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the air permeability flow rate of the photocatalytic air purification device is not less than 0.3 m³ / s. 3 / min.

[0032] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the air permeability flow rate of the photocatalytic air purification device is not less than 1.0 m³ / s. 3 / min.

[0033] The photocatalytic air purification device provided by this utility model may also have the following technical feature: the air permeability of the photocatalytic air purification device is not less than 3.0 m³ / h. 3 / min.

[0034] Functions and effects of utility models

[0035] According to the photocatalytic air purification device provided by this utility model, its filter assembly includes a light source, a photocatalytic filter component, and a light leakage protection filter component. The light leakage protection filter component is located in front of the light source and is made of a porous material. Therefore, the light source can irradiate the photocatalytic filter component to excite the photocatalytic reaction and purify the air. At the same time, the pores in the light leakage protection filter component (porous material) can absorb or scatter the excitation light generated by the light source, thereby blocking the excitation light and reducing or preventing the leakage of excitation light, thus protecting the human body. Since the light leakage is reduced or prevented through the light leakage protection filter component, it is not necessary to reduce the number of air inlets or their opening size, nor is it necessary to design an airway structure that allows air to detour. Therefore, sufficient airflow can be ensured, thereby ensuring a highly efficient air purification effect. Furthermore, compared with existing photocatalytic air purification devices, this utility model only adds a light leakage protection filter component, thus avoiding the complexity of the photocatalytic air purification device structure. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the photocatalytic air purification device in Embodiment 1 of this utility model;

[0037] Figure 2 This is a schematic diagram of the light leakage protection filter component in Embodiment 1 of this utility model;

[0038] Figure 3This is a schematic diagram of the light leakage protection filter component in Embodiment 7 of this utility model;

[0039] Figure 4 This is a schematic diagram of the light leakage protection filter component in Embodiment 9 of this utility model;

[0040] Figure 5 This is a structural schematic diagram of a rear-exhaust photocatalytic air purifier in the existing technology;

[0041] Figure 6 This is a structural schematic diagram of a front-exit photocatalytic air purifier in the existing technology;

[0042] Figure 7 This is a schematic diagram of the structure of a photocatalytic air purifier with a meandering airflow channel in the existing technology.

[0043] Figure label:

[0044] Photocatalytic air purification device 10; housing 11; receiving cavity 111; air inlet 112; air outlet 113; light source 12; ultraviolet lamp 121; photocatalytic filter component 13; light leakage protection filter component 14; connecting hole 141; pore 142; glass fiber filament 143; filter frame 144; filter element 145; photocatalytic air purifier 70 with a meandering airflow channel; housing 71; air inlet 711; air outlet 712; light source 72; photocatalytic filter component 73; rear-exit type photocatalytic air purifier 80; housing 81; air inlet 811; air outlet 812; light source 82; photocatalytic filter component 83; front-exit type photocatalytic air purifier 90; housing 91; air inlet 911; air outlet 912; light source 92; photocatalytic filter component 93. Detailed Implementation

[0045] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the photocatalytic air purification device of this utility model will be specifically described below in conjunction with the embodiments and accompanying drawings.

[0046] Example 1

[0047] This embodiment provides a photocatalytic air purification device. To facilitate the explanation of the improvements of this embodiment, the structure and working principle of existing ordinary photocatalytic air purification devices will be briefly described below.

[0048] Figure 1 This is a schematic diagram of the photocatalytic air purification device in this embodiment.

[0049] like Figure 1As shown, the photocatalytic air purification device 10 of this embodiment includes a housing 11, a filter assembly disposed within the housing 11, and an airflow drive mechanism (not shown in the figure).

[0050] The interior of the housing 11 is a receiving cavity 111. Multiple air inlets 112 communicating with the receiving cavity 111 are formed on one side of the housing 11; multiple air outlets 113 communicating with the receiving cavity 111 are formed on the other side of the housing 11. In this embodiment, the opening directions of both the air inlets 112 and the air outlets 113 are horizontal. The multiple air inlets 112 are arranged at equal intervals from top to bottom along one side of the housing 11, and the multiple air outlets 113 are arranged at equal intervals from top to bottom along the other side of the housing 11.

[0051] The filter assembly is disposed within the receiving cavity 111 of the housing 11, between the air inlet 112 and the air outlet 113, and is used to filter the air entering from the air inlet 112, making it purified air. The filter assembly includes a light source 12, one or more photocatalytic filter elements 13, and a light leakage protection filter element 14, which are arranged sequentially from the air outlet 113 to the air inlet 112. A certain gap is left between the light source 12 and the photocatalytic filter element 13, and between the photocatalytic filter element 13 and the light leakage protection filter element 14. When there are multiple photocatalytic filter elements 13, a certain gap is also left between their adjacent elements.

[0052] That is, the photocatalytic air purifier 10 in this embodiment is a rear-exit type photocatalytic air purifier. In an alternative, the photocatalytic air purifier 10 can also be a front-exit type photocatalytic air purifier, that is, the back of the housing 11 is the air inlet, the front of the housing 11 is the air outlet, and the light source 12, one or more photocatalytic filter components 13 and light leakage protection filter components 14 are arranged sequentially from the air inlet to the air outlet.

[0053] The light source 12 is used to irradiate the photocatalytic filter component 13 to excite it to undergo a photocatalytic reaction with the passing air. The excitation light generated by the light source 12 includes light in the ultraviolet region and light in the visible region.

[0054] In this embodiment, the light source 12 includes a plurality of identical ultraviolet lamps 121. The ultraviolet lamps 121 are light-emitting diodes (LEDs) emitting wavelengths in the ultraviolet region, and their light intensity is 40mW / cm². 2 .

[0055] The photocatalytic filter element 13 is used to carry out a photocatalytic reaction under the irradiation of the excitation light generated by the light source 12, thereby purifying the air passing through the photocatalytic filter element 13. The photocatalytic filter element 13 can be a photocatalytic filter element in the prior art, such as a metal mesh coated with a photocatalyst, which is in the form of a sheet or plate.

[0056] In this embodiment, the photocatalytic filter element 13 consists of two identical pieces, both of which are aluminum (Al) meshes coated with titanium dioxide (TiO2), with a mesh count of 100 PPI, an open area of ​​50%, and an area of ​​1050 cm². 2 .

[0057] In alternative solutions, depending on the purification requirements, the photocatalytic filter element 13 can be one or more pieces, or multiple pieces of different types, or other types of photocatalysts or other types of metal mesh can be used.

[0058] A light leakage protection filter component 14 is disposed within the receiving cavity 111 of the housing 11, and is located closer to the side of the housing 11 with the air inlet 112 than the photocatalytic filter component 13. It is used to prevent light leakage of the excitation light generated by the light source 12, while still ensuring sufficient airflow for rapid air purification. The light leakage protection filter component 14 is made of a porous material and is generally sheet-like or plate-like, matching the photocatalytic filter component 13. The light leakage protection filter component 14 has a large number of connecting holes 141 that connect its two surfaces in the thickness direction. The connecting holes 141 are non-straight-through holes that prevent light from directly passing through along the thickness direction of the light leakage protection filter component 14. The extending direction of the connecting holes 141 is inclined relative to the thickness direction of the light leakage protection filter component 14, or it has at least one bend or fold. The bend, i.e., a portion of the connecting hole 141, is curved. The fold, i.e., a portion of the connecting hole 141, is a straight-line bend.

[0059] In this embodiment, the required light leakage prevention performance is: in the ultraviolet region (light wavelength 340nm), the intensity of the leaked light needs to be controlled at 1000μW / cm². 2 The following (US Industrial Hygiene Experts Conference Standard): With a light source intensity of 10 mW / cm². 2 For example, the intensity of the leaked excitation light needs to be attenuated to less than 10% of the light source intensity. Furthermore, in the visible light region (wavelength 450nm), the intensity of the leaked excitation light needs to be attenuated to approximately 25%–45% of the light source intensity. Regarding airflow rate, it needs to ensure the 0.3m³ / h required by typical photocatalytic air purification devices. 3 Air flow rate of 100 m / min or higher.

[0060] To meet the above requirements, various porous materials can be effectively used as materials for the light leakage protection filter component 14. These porous materials achieve light blocking by absorbing or scattering light. To effectively block light, these materials need to have the most suitable pore radius and pore shape structure. In terms of pore shape, materials with curved pore structures are more effectively used in the device of this embodiment compared to straight holes that allow light to pass through. At the same time, a suitable porosity is required to ensure sufficient air permeability. In addition, the thickness of the porous material needs to be appropriately set according to the combined requirements of the light blocking ratio and the air permeability.

[0061] Furthermore, by appropriately coloring porous materials, light absorption can be increased while maintaining air permeability, thereby achieving more efficient light blocking. The substances used for coloring porous materials can be various dyes or pigments.

[0062] Figure 2 This is a schematic diagram of the light leakage protection filter component in this embodiment, showing a cross-sectional view of the component.

[0063] like Figure 2 As shown, in this embodiment, the light leakage protection filter component 14 is a polymer foam product. Polymer foam is a porous material made by foaming molten polymer to form a large number of pores 142 inside, with multiple pores 142 interconnected to form multiple interconnected holes 141. The pore size and pore density can be adjusted by controlling the manufacturing conditions. The pore density of polymer foam is expressed as pores per inch (PPI). Among these polymer foams, those with interconnected pore structures formed by controlling the manufacturing conditions can be effectively applied to the uses of this invention. Such polymer foams can be made of polyurethane, polyethylene, polypropylene, etc. While polymer foams with smaller pore sizes and higher densities (high PPI) have better light shielding effects, they reduce air permeability. Therefore, a balance needs to be struck between light shielding efficiency and air permeability, selecting polymer foams that meet the requirements for both light leakage rate and air permeability. Furthermore, these polymer foams can be colored by adding pigments, etc., to more effectively absorb light.

[0064] The light leakage protection filter element 14 has a mesh count of 7 PPI to 60 PPI and a thickness of 10 mm to 20 mm. The light leakage protection filter element 14 ensures that the intensity of leaked light does not exceed 1000 μW / cm² in the ultraviolet region. 2 Preferably, it does not exceed 500 μW / cm 2 More preferably not exceeding 100 μW / cm 2Simultaneously, the light leakage protection filter component 14 attenuates visible light by more than 45%, preferably more than 30%, and more preferably more than 20% after passing through the component; furthermore, the light leakage protection filter component 14 ensures that the air permeability of the photocatalytic air purification device 10 is not less than 0.3 m³ / s. 3 / min, preferably not less than 1.0m 3 / min, more preferably not less than 3.0m 3 / min.

[0065] In this embodiment, preferably, the light leakage protection filter component 14 is an uncolored polyurethane foam film, which is white or milky white in color, has a mesh count of 25 PPI, and a thickness of 10 mm.

[0066] The airflow drive mechanism drives air to flow from the air inlet 112 to the air outlet 113, allowing external air to enter through the air inlet 112 and flow in the aforementioned direction, passing sequentially through the photocatalytic filter component 13 and the light leakage protection filter component 14, and then being purified before being discharged from the air outlet 113. The airflow drive mechanism can be, for example, a fan installed inside the housing 11.

[0067] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter component 14, after inserting the aforementioned uncolored polyurethane foam light leakage protection filter component 14 into the device, the excitation light generated by the light source 12, after passing through the light leakage protection filter component 14, experiences an 8% attenuation in the ultraviolet region (wavelength 370nm) and a 0% attenuation in the visible light region (wavelength 450nm). The leakage light intensity is 110 μW / cm² in the ultraviolet region and 0.6 μW / cm² in the visible light region. 2 The airflow rate (air volume) is 18.6 m³ / h. 3 / min, ensuring 77% airflow compared to before insertion.

[0068] Functions and effects of Example 1

[0069] According to the photocatalytic air purification device provided in this embodiment, its filter assembly includes a light source, a photocatalytic filter component, and a light leakage protection filter component. The light leakage protection filter component is located in front of the light source and is made of a porous material. Therefore, the light source can irradiate the photocatalytic filter component to excite the photocatalytic reaction and purify the air. Simultaneously, the pores in the light leakage protection filter component (porous material) can absorb or scatter the excitation light, thereby blocking the excitation light generated by the light source, reducing or preventing the leakage of excitation light, and protecting the human body. Since the light leakage is reduced or prevented through the light leakage protection filter component, it is not necessary to reduce the number or size of air inlets or design a detour-oriented airflow structure. Therefore, sufficient airflow can be ensured, thus guaranteeing a highly efficient air purification effect. Furthermore, compared to existing photocatalytic air purification devices, this embodiment only adds a light leakage protection filter component, thus avoiding the complexity of the photocatalytic air purification device structure.

[0070] In this embodiment, the light leakage protection filter component is a polymer foam product with multiple interconnected pores distributed on it. These pores are non-through-hole, preventing excitation light from passing directly along the thickness direction of the light leakage protection filter component, thereby reducing or preventing light leakage. Furthermore, by controlling the manufacturing conditions, the pore size and pore density of the hollow pores in the polymer foam product can be changed, thereby achieving a balance between light shielding efficiency and air transmittance, making the photocatalytic air purification device suitable for various application scenarios.

[0071] Furthermore, the light absorption rate of polymer foam products can be further increased by coloring them, thereby better reducing or preventing light leakage.

[0072] Example 2

[0073] This embodiment provides a photocatalytic air purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0074] The photocatalytic air purification device in this embodiment has the same structure as in Embodiment 1, except that the light leakage protection filter component 14 is also an uncolored polyurethane foam film. The difference lies in its parameters, which are different from those in Embodiment 1. In this embodiment, the light leakage protection filter component 14 has a mesh count of 7 PPI and a thickness of 10 mm.

[0075] In this embodiment, the other structures and parameters are the same as in Embodiment 1.

[0076] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter component 14, after inserting the aforementioned polyurethane foam light leakage protection filter component 14 into the device, the intensity of the excitation light generated by the light source 12 is attenuated by 28% in the ultraviolet region and 13% in the visible light region after passing through the light leakage protection filter component 14. The leakage light intensity is 411 μW / cm² in the ultraviolet region. 2 Visible light region 2.1 μW / cm 2 The airflow rate (air volume) is 23.4 m³ / h. 3 / min, ensuring 98% airflow compared to before insertion.

[0077] Example 3

[0078] This embodiment provides a photocatalytic air purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0079] The photocatalytic air purification device in this embodiment has the same structure as in Embodiment 1, except that the light leakage protection filter component 14 is also an uncolored polyurethane foam film. The difference lies in its parameters, which are different from those in Embodiment 1. In this embodiment, the light leakage protection filter component 14 has a mesh count of 7 PPI and a thickness of 20 mm.

[0080] In this embodiment, the other structures and parameters are the same as in Embodiment 1.

[0081] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter component 14, after inserting the aforementioned polyurethane foam light leakage protection filter component 14 into the device, the intensity of the excitation light generated by the light source 12 is attenuated by 19% in the ultraviolet region and 32% in the visible light region after passing through the light leakage protection filter component 14. The leakage light intensity is 275 μW / cm² in the ultraviolet region. 2 Visible light region 4.5 μW / cm 2 The airflow rate (air volume) is 24.0 m³ / h. 3 / min, ensuring 100% airflow compared to before insertion.

[0082] Example 4

[0083] This embodiment provides a photocatalytic air purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0084] The photocatalytic air purification device in this embodiment has the same structure as in Embodiment 1, except that the light leakage protection filter component 14 is also an uncolored polyurethane foam film. The difference lies in its parameters, which are different from those in Embodiment 1. In this embodiment, the light leakage protection filter component 14 has a mesh count of 60 PPI and a thickness of 10 mm.

[0085] In this embodiment, the other structures and parameters are the same as in Embodiment 1.

[0086] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter component 14, after inserting the aforementioned polyurethane foam light leakage protection filter component 14 into the device, the intensity of the excitation light generated by the light source 12 decreases by 0% in the ultraviolet region and by 1% in the visible light region after passing through the light leakage protection filter component 14. The leakage light intensity is 3.8 μW / cm² in the ultraviolet region. 2 0.2 μW / cm in the visible light region 2 The airflow rate (air volume) is 21.6 m³ / h. 3 / min, ensuring 92% airflow compared to before insertion.

[0087] Example 5

[0088] This embodiment provides a photocatalytic air purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0089] The photocatalytic air purification device in this embodiment has the same structure as that in Embodiment 1, wherein the light leakage protection filter component 14 is also a polyurethane foam film, the difference being that it is a black polyurethane foam film. In this embodiment, the light leakage protection filter component 14 has a mesh count of 7 PPI and a thickness of 10 mm.

[0090] In this embodiment, the other structures and parameters are the same as in Embodiment 1, so they will not be described again.

[0091] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter component 14, after inserting the aforementioned polyurethane foam light leakage protection filter component 14 into the device, the intensity of the excitation light generated by the light source 12 decreases by 5% in the ultraviolet region and 0% in the visible light region after passing through the light leakage protection filter component 14. The leakage light intensity is 71.9 μW / cm² in the ultraviolet region. 2 0.1 μW / cm in the visible light region 2 The airflow rate (air volume) is 23.4 m³ / h. 3 / min, ensuring 98% airflow compared to before insertion.

[0092] Example 6

[0093] This embodiment provides a photocatalytic air purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0094] The photocatalytic air purification device in this embodiment has the same structure as in Embodiment 1, except that the light leakage protection filter component 14 is also a polyurethane foam film, but it is a black polyurethane foam film. In this embodiment, the light leakage protection filter component 14 has a mesh count of 35 PPI and a thickness of 10 mm.

[0095] In this embodiment, the other structures and parameters are the same as in Embodiment 1, so they will not be described again.

[0096] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter component 14, after inserting the aforementioned polyurethane foam light leakage protection filter component 14 into the device, the intensity of the excitation light generated by the light source 12 decreases by 2% in the ultraviolet region and 0% in the visible light region after passing through the light leakage protection filter component 14. The leakage light intensity is 26.8 μW / cm² in the ultraviolet region. 2 0.1 μW / cm in the visible light region 2 The airflow rate (air volume) is 21.6 m³ / h. 3 / min, ensuring 92% airflow compared to before insertion.

[0097] Example 7

[0098] This embodiment provides a photocatalytic air purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0099] Figure 3 This is a schematic diagram of the light leakage protection filter component in this embodiment.

[0100] like Figure 3 As shown, the difference from Embodiment 1 is that the light leakage protection filter component 14 in this embodiment has a glass fiber braided structure. Glass fiber braids are woven from glass fiber filaments of uniform thickness with a diameter of approximately 1μm to 10μm, and are widely used in various filtration applications. Uncolored glass fiber filter braids primarily reduce light intensity through light scattering, while coloring treatment increases light absorption, thus making them more effective as light shielding materials.

[0101] In this embodiment, the light leakage protection filter component 14 is a black glass fiber filter membrane, which is woven from multiple black glass fiber filaments 143, with the aforementioned connecting holes 141 formed between the interwoven glass fiber filaments 143. The average pore size of this glass fiber filter membrane is 1.6 μm, and its thickness is 0.9 mm.

[0102] In this embodiment, the other structures and parameters are the same as in Embodiment 1.

[0103] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter 14, after inserting the aforementioned glass fiber light leakage protection filter 14 into the device, the intensity of the excitation light generated by the light source 12 decreases by 6% in the ultraviolet region and 2% in the visible light region after passing through the light leakage protection filter 14. The leakage light intensity is 84.9 μW / cm² in the ultraviolet region. 2 0.3 μW / cm in the visible light region 2 The airflow rate (air volume) is 17.4 m³ / h. 3 / min, ensuring 73% more airflow compared to before insertion.

[0104] Example 8

[0105] This embodiment provides a photocatalytic air purification device. In this embodiment, the same symbols are assigned to the same components as in Embodiment 7, and the corresponding descriptions are omitted.

[0106] Compared with Example 7, the difference is that the light leakage protection filter component 14 in this example is a black glass fiber filter membrane with an average pore size of 1.8 μm and a thickness of 0.9 mm.

[0107] In this embodiment, the other structures and parameters are the same as in Embodiment 7.

[0108] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter 14, after inserting the aforementioned glass fiber light leakage protection filter 14 into the device, the intensity of the excitation light generated by the light source 12 decreases by 0% in the ultraviolet region and by 13% in the visible light region after passing through the light leakage protection filter 14. The leakage light intensity is 2.4 μW / cm² in the ultraviolet region. 2 1.8 μW / cm in the visible light region 2 The airflow rate (air volume) is 17.1 m³. 3 / min, ensuring 74% airflow compared to before insertion.

[0109] Example 9

[0110] This embodiment provides a photocatalytic air purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0111] Figure 4 This is a schematic diagram of the light leakage protection filter component in this embodiment.

[0112] like Figure 4As shown, the difference compared to Embodiment 1 is that the light leakage protection filter component 14 in this embodiment is a HEPA filter component, specifically an uncolored HEPA filter. HEPA filters are made of glass fiber or polymer fiber and are installed in photocatalytic air purification devices to capture and remove airborne particles. To improve capture efficiency, a folded structure is typically used. Uncolored HEPA filter components can reduce light through light scattering, while colored HEPA filters can effectively prevent light leakage. Figure 4 As shown, the HEPA filter includes a filter frame 144 and a filter element 145 arranged in a folded structure in the filter frame 144. The filter element 145 is made of glass fiber or polymer fiber and has a large number of the aforementioned connecting holes 141 distributed on the filter element 145.

[0113] In this embodiment, the other structures and parameters are the same as in Embodiment 1.

[0114] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter 14, after inserting the aforementioned glass fiber light leakage protection filter 14 into the device, the intensity of the excitation light generated by the light source 12 decreases by 0% in the ultraviolet region and by 13% in the visible light region after passing through the light leakage protection filter 14. The leakage light intensity is 2.4 μW / cm² in the ultraviolet region. 2 1.8 μW / cm in the visible light region 2 The airflow rate (air volume) is 17.1 m³. 3 / min, ensuring 74% airflow compared to before insertion.

[0115] Example 10

[0116] This embodiment provides a photocatalytic air purification device. In this embodiment, the same symbols are used for the same components as in Embodiment Nine, and the corresponding descriptions are omitted.

[0117] Compared with Embodiment Nine, the difference is that the light leakage protection filter component 14 in this embodiment is a black HEPA filter.

[0118] In this embodiment, the other structures and parameters are the same as in Embodiment 1.

[0119] In this embodiment, compared to a photocatalytic air purification device without a light leakage protection filter 14, after inserting the aforementioned glass fiber light leakage protection filter 14 into the device, the intensity of the excitation light generated by the light source 12 decreases by 0% in the ultraviolet region and 0% in the visible light region after passing through the light leakage protection filter 14. The leakage light intensity is 1.8 μW / cm² in the ultraviolet region. 2 0.7 μW / cm in the visible light region 2 The airflow rate (air volume) is 19.8 m³ / h.3 / min, ensuring 84% airflow compared to before insertion.

[0120] The above embodiments are merely illustrative of specific implementations of this utility model, and the utility model is not limited to the scope of the above embodiments. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are only for illustrating the principles of the utility model. Various changes and modifications can be made to the utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A photocatalytic air purification device, characterized in that, include: The housing has an air inlet and an air outlet, which are used to allow air to enter and to allow purified air to exit, respectively. as well as A filter assembly, disposed between the air outlet and the air inlet, is used to filter the incoming air. The filtering component includes: One or more photocatalytic filter components; A light source is used to generate excitation light to irradiate the photocatalytic filter element, causing the photocatalytic filter element to undergo a photocatalytic reaction with the passing air; and A light leakage protection filter component, disposed in front of the light source, is made of a porous material to allow air to pass through and to absorb or scatter the excitation light, thereby reducing or preventing the leakage of the excitation light.

2. The photocatalytic air purification device according to claim 1, characterized in that: in, The light leakage protection filter component has multiple connecting holes that connect its two surfaces in the thickness direction. The connecting hole is a non-through hole, which prevents the excitation light from passing directly along the thickness direction of the light leakage protection filter component.

3. The photocatalytic air purification device according to claim 2, characterized in that: in, The extension direction of the connecting hole is inclined relative to the thickness direction of the light leakage protection filter component, or it has at least one bend or fold.

4. The photocatalytic air purification device according to claim 1, characterized in that: in, The air inlet and the air outlet are respectively located on both sides of the housing. The light source, the photocatalytic filter, and the light leakage protection filter are arranged in sequence, and there are gaps between the light source and the photocatalytic filter, and between the photocatalytic filter and the light leakage protection filter.

5. The photocatalytic air purification device according to claim 1, characterized in that: in, The light leakage protection filter component is any one of polymer foam products, glass fiber braided material, or high-efficiency particulate air filter.

6. The photocatalytic air purification device according to claim 5, characterized in that: in, The light leakage protection filter component is any one of colored polymer foam products, colored glass fiber braids, or colored high-efficiency particulate air filters.

7. The photocatalytic air purification device according to claim 5, characterized in that: in, The polymer foam product is any one of polyurethane film, polyethylene film, and polypropylene film.

8. The photocatalytic air purification device according to claim 5, characterized in that: in, The polymer foam product has a mesh count of 7 PPI to 60 PPI and a thickness of 10 mm to 20 mm.

9. The photocatalytic air purification device according to any one of claims 1-8, characterized in that: in, The excitation light produced by the light source includes ultraviolet light. The light leakage protection filter ensures that the intensity of leaked light does not exceed 1000 μW / cm² in the ultraviolet region. 2 .

10. The photocatalytic air purification device according to claim 9, characterized in that: in, The light leakage protection filter ensures that the intensity of leaked light does not exceed 500 μW / cm² in the ultraviolet region. 2 .

11. The photocatalytic air purification device according to claim 10, characterized in that: in, The light leakage protection filter ensures that the intensity of leaked light does not exceed 100 μW / cm² in the ultraviolet region. 2 .

12. The photocatalytic air purification device according to any one of claims 1-8, characterized in that: in, The excitation light generated by the light source includes light in the visible light region. The light leakage protection filter component attenuates light in the visible light region by more than 45% after passing through it.

13. The photocatalytic air purification device according to claim 12, characterized in that: in, The light leakage protection filter component attenuates light in the visible light region by more than 30% after passing through it.

14. The photocatalytic air purification device according to claim 13, characterized in that: in, The light leakage protection filter component attenuates light in the visible light region by more than 20% after passing through it.

15. The photocatalytic air purification device according to any one of claims 1-8, characterized in that: in, The air permeability of the photocatalytic air purification device is not less than 0.3 m³ / s. 3 / min.

16. The photocatalytic air purification device according to claim 15, characterized in that: in, The air permeability of the photocatalytic air purification device is not less than 1.0 m³ / h. 3 / min.

17. The photocatalytic air purification device according to claim 16, characterized in that: in, The air permeability of the photocatalytic air purification device is not less than 3.0 m³ / h. 3 / min.

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