Air purifying device and method of purifying the same

Abstract

The application discloses an air purification device and a purification method thereof. The air purification device comprises a primary filter layer and at least one secondary filter layer arranged in sequence along a flow path of air flow, and a polymer membrane layer arranged downstream of the at least one secondary filter layer. The secondary filter layer comprises a conductive filter screen cloth and a catalyst laid on the filter screen cloth. The filter screen cloth is electrically connected to a power supply to form a conductive backflow. The application can provide heat for the polymer membrane layer to inactivate microorganisms while catalytically oxidizing volatile organic compounds.

Description

Technical Field

[0001] This application relates to the field of air purification technology, and in particular to an air purification device and its purification method. Background Technology

[0002] Air purification refers to providing comprehensive solutions for various indoor environmental problems, including sterilization and disinfection, dust reduction and haze removal, removal of harmful renovation residues and odors, improving living and working conditions, and enhancing physical and mental health. Indoor environmental pollutants and sources mainly include radioactive gases, mold, particulate matter, renovation residues, and secondhand smoke.

[0003] Currently, HEPA air purifiers on the market no longer meet consumer needs. Most air purifiers use physical methods, relying on filters and activated carbon to collect particulate matter. However, harmful substances attached to these particles, such as viruses and bacteria, cannot be dissolved, and these substances collected in the filters or dust bags become secondary sources of pollution. A few purifiers use chemical methods, but due to the use of chemical media, their limited range of applications to address the wide range of harmful substances, or the weakness of chemical media in dealing with the hardness of certain harmful substances, they fail to effectively dissolve harmful substances in the air. Although these air purifiers have air filtration and inefficient sterilization functions, no product can effectively detoxify and kill bacteria and viruses while purifying the air. Especially with the recent global outbreak of the novel coronavirus, whose particle size is 0.085um-0.135um, and the inability of current air purifiers to block the spread of bacteria and viruses, cases of infection within the same environment are not uncommon.

[0004] Therefore, how to maximize the decomposition of harmful substances in the air and filter out fine particulate matter is an urgent problem to be solved. Summary of the Invention

[0005] The embodiments of this application provide an air purification device and a purification method thereof to solve the technical problems of the difficulty in decomposing harmful substances in the air and the difficulty in filtering fine particulate matter.

[0006] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0007] This application provides an air purification device, which includes a primary filter layer and at least one secondary filter layer arranged sequentially along the flow path of the airflow. A polymer membrane layer is provided downstream of the at least one secondary filter layer. The secondary filter layer includes a conductive filter cloth and a catalyst laid on the filter cloth. The filter cloth is electrically connected to a power source to form a conductive return current.

[0008] Furthermore, the secondary filter layer is arranged to consist of at least one filter subset, each filter subset comprising a pair of adjacent secondary filter layers, wherein at least one filter subset is provided with the polymer membrane layer disposed between the respective pair of secondary filter layers.

[0009] Furthermore, along the flow path of the airflow, the catalyst loading of the corresponding pair of secondary filter layers in each filter subset decreases sequentially.

[0010] Furthermore, the transition metal of the catalyst; along the flow path of the gas flow, in a corresponding pair of the secondary filter layers of one of the filter subsets, the loading of the transition metal of the catalyst decreases sequentially.

[0011] Furthermore, the transition metal of the catalyst includes at least one of manganese, cobalt, and copper; the material used for the filter cloth includes activated carbon cloth and / or activated carbon fiber.

[0012] Furthermore, when the transition metal of the catalyst is manganese, the loading of manganese oxide in the corresponding pair of secondary filter layers of one of the filter subsets is 8-12 wt% and 2.5-3.5 wt%, respectively, along the flow path of the gas flow.

[0013] Furthermore, the secondary filter layer is arranged to consist of a filter subset, the filter subset including a pair of secondary filter layers, and the polymer membrane layer is disposed between the pair of secondary filter layers.

[0014] Furthermore, the air purification device also includes at least one pair of parallel electrodes disposed on both sides of the filter cloth.

[0015] Furthermore, the polymer membrane is a nylon membrane with a pore size less than or equal to 0.1 μm.

[0016] Furthermore, the primary filter layer comprises one of electrostatic cotton nonwoven fabric, nylon mesh, and metal mesh.

[0017] Furthermore, the air purification device also includes: two first fixing frames, respectively disposed at both ends of the primary filter layer; and two second fixing frames, respectively disposed at both ends of the secondary filter layer.

[0018] Furthermore, the material of the second fixing frame includes polyvinyl chloride.

[0019] Furthermore, the air purification device also includes a housing, wherein both the first fixing frame and the second fixing frame are detachably installed inside the housing.

[0020] This application also provides an air purification method for use in an air purification device, the air purification method comprising the following steps:

[0021] Air is drawn into the interior of the air purification device;

[0022] The primary filter layer removes solid particulate matter from the air;

[0023] The secondary filter layer adsorbs volatile organic compounds in the air;

[0024] The polymer membrane layer adsorbs microorganisms in the air;

[0025] When the filter mesh of the secondary filter layer is electrified, the catalyst laid on the filter mesh catalyzes the decomposition of volatile organic compounds, and the secondary filter layer provides heat to the polymer membrane layer to inactivate microorganisms.

[0026] Furthermore, after the step of adsorbing microorganisms in the air by the polymer membrane layer, the air purification method further includes: adsorbing volatile organic compounds in the air again by passing through primary and secondary filter layers.

[0027] One of the above technical solutions has the following advantages or beneficial effects: supplying power to at least one secondary filter layer mainly utilizes the Joule heating effect of the filter mesh to restore the activity of the catalyst and maintain the high efficiency of the catalyst in catalyzing the oxidation of formaldehyde; the polymer membrane layer is disposed between a pair of secondary filter layers, and the secondary filter layer provides heat to the polymer material of the polymer membrane layer to effectively detoxify and sterilize, so as to ensure that microorganisms, including viruses, are completely inactivated. Attached Figure Description

[0028] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the air purification device provided in Embodiment 1 of this application.

[0030] Figure 2 This is a schematic diagram of the air purification device provided in Embodiment 2 of this application.

[0031] Figure 3 This is a schematic diagram of the air purification device provided in Embodiment 3 of this application.

[0032] Figure 4 This is a schematic diagram of the air purification device provided in Embodiment 4 of this application.

[0033] The components in the attached diagram are labeled as follows:

[0034] 10. Primary filter layer; 20. Secondary filter layer;

[0035] 30. Polymer membrane; 40. Power supply;

[0036] 50. Housing; 201. Filter mesh;

[0037] 202. Parallel electrode; 110. First fixing frame;

[0038] 210. Second fixed frame. Detailed Implementation

[0039] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0040] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] This application provides an air purification device and method thereof. The air purification device includes a primary filter layer 10 and at least one secondary filter layer 20 arranged sequentially along the airflow path. A polymer membrane layer 30 is disposed downstream of the at least one secondary filter layer 20. The secondary filter layer 20 includes a conductive filter mesh 201 and a catalyst laid on the filter mesh 201. The filter mesh 201 is electrically connected to a power source 40 to form a conductive return current. The Joule heating effect of the filter mesh 201 is used to restore the activity of the catalyst (such as MnO2) to maintain the high efficiency of the catalyst in catalytic oxidation of formaldehyde. Simultaneously, heat is provided to the polymer material of the polymer membrane layer 30 for effective detoxification and sterilization. The secondary filter layer 20 is arranged to consist of at least one filter subset, each filter subset including a pair of adjacent secondary filter layers 20. At least one filter subset has a polymer membrane layer 30 disposed between corresponding pairs of secondary filter layers. Along the flow path of the airflow, the catalyst loading of the corresponding pair of secondary filter layers 20 in each filter subset decreases sequentially.

[0043] Example 1

[0044] like Figure 1 As shown, this embodiment provides an air purification device, which includes a primary filter layer 10, at least one secondary filter layer 20, and a polymer membrane layer 30 arranged sequentially along the airflow path. The arrows in the figure indicate the direction of airflow.

[0045] The primary filter layer 10 serves as the first stage of filtration in the air purifier, effectively removing larger particles. The primary filter layer 10 can adopt the H12 filtration grade (EU EN1882 standard) and includes one of the following: electrostatic cotton non-woven fabric, nylon mesh, or metal mesh. It can achieve preliminary filtration of particles or dust, thus achieving primary air purification. In this embodiment, the pore size of the primary filter layer 10 is controlled within 0.3 μm, primarily filtering particles in the recirculated air, achieving a removal efficiency of over 99.97% for particles with a diameter of 0.3 μm or larger.

[0046] The secondary filter layer 20 is disposed to the left of the primary filter layer 10. The secondary filter layer 20 includes a conductive filter cloth 201 and a catalyst laid on the filter cloth 201. The filter cloth 201 is electrically connected to a power source to form a conductive return current.

[0047] The secondary filter layer 20 has hydrophilic groups on the activated carbon cloth that form hydrogen bonds with formaldehyde molecules, exhibiting excellent formaldehyde adsorption performance. It is primarily used to adsorb volatile organic compounds such as formaldehyde without causing secondary pollution. For example, when the catalyst is MnO2, MnO2 catalyzes the decomposition of organic compounds such as formaldehyde, ultimately producing carbon dioxide and water. Taking formaldehyde as an example, its catalytic reaction principle is as follows:

[0048]

[0049] Therefore, the secondary filter layer 20 can effectively decompose volatile organic compounds such as formaldehyde in the air, and the effect is better.

[0050] In this embodiment, the transition metal of the catalyst includes at least one of manganese, cobalt, and copper, and the material used for the filter mesh includes one or both of activated carbon cloth and activated carbon fiber. When the transition metal of the catalyst is manganese (Mn), the higher the manganese loading, the better the treatment effect on volatile organic compounds such as formaldehyde. However, an increased manganese loading will negatively affect the Joule heating effect. Therefore, in the secondary filter layer 20, the loading of manganese oxide (such as manganese dioxide) is 8-12 wt%, which can effectively decompose volatile organic compounds such as formaldehyde in the air, and the effect is better.

[0051] Once formaldehyde and other volatile organic compounds accumulate to a certain level, the adsorption capacity of the secondary filter layer 20 decreases, which can lead to a secondary source of pollution and result in poor formaldehyde purification.

[0052] Therefore, the air purification device provided in this embodiment also includes a pair of parallel electrodes 202. These parallel electrodes 202 are positioned on opposite sides of the filter mesh 201, and are connected to a power supply 40. When energized, an 8V voltage is applied to the pair of parallel electrodes 202. Utilizing the Joule heating effect of the filter mesh 201 in the secondary filter layer 20, the activity of the catalyst is restored to maintain its high efficiency in catalytically oxidizing formaldehyde. Simultaneously, heat is provided to the polymer material of the polymer membrane layer 30 for effective detoxification and sterilization, and to extend the service life of the filter mesh (such as activated carbon adsorbent), reducing the operating cost of the air purification equipment. Simultaneously, with an 8V voltage applied to the secondary filter layer 20, the polymer membrane layer 30 rapidly heats up to 138°C within 20 seconds. When the temperature of the polymer membrane layer 30 reaches approximately 138°C, microorganisms adsorbed on the polymer membrane layer 30, such as bacteria and viruses, are inactivated by the high-temperature radiation and thermal conductivity of the secondary filter layer 20, thereby achieving effective detoxification and sterilization. It should be noted that around 138℃ is the temperature at which bacteria can be inactivated.

[0053] Furthermore, the polymer membrane layer 30 is an organically synthesized membrane, which is made of materials with excellent temperature stability and good anti-shrinkage properties, including but not limited to nylon membranes. Nylon membranes have high protein adsorption capacity, are durable, and have high strength, as well as excellent temperature stability, maintaining good anti-shrinkage properties during sterilization. Moreover, the small pore size of nylon membranes effectively captures microorganisms, including viruses. In this embodiment, the pore size of the nylon membrane is less than or equal to 0.1 μm, which can capture 99.99% of microorganisms, including viruses.

[0054] Therefore, the air purification device provided in this embodiment supplies power to the secondary filter layer 20 mainly by utilizing the Joule heating effect of the filter cloth 201 (such as adsorbent activated carbon) to restore the activity of the catalyst and maintain the high efficiency of the catalyst in catalyzing the oxidation of formaldehyde. At the same time, it provides heat to the polymer material of the polymer membrane layer 30 to effectively detoxify and sterilize.

[0055] The air purification device provided in this embodiment also includes a first fixing frame 110, a second fixing frame 210, and a housing 50. The first fixing frame 110 and the second fixing frame 210 can be detachably installed in the housing 50, which facilitates the disassembly, cleaning, and replacement of each component.

[0056] Specifically, two first fixing frames 110 are respectively disposed at the upper and lower ends of the primary filter layer 10 to fix the primary filter layer 10 and facilitate its installation within the housing 50. Two second fixing frames 210 are respectively disposed at the upper and lower ends of the secondary filter layer 20 to fix the secondary filter layer 20 and facilitate its installation within the housing 50. The first fixing frames 110 can be made of insulating material or non-insulating material, without particular limitation. The second fixing frames 210 are made of insulating material, such as polyvinyl chloride, whose insulation properties can prevent leakage between the two parallel electrodes 202.

[0057] Furthermore, the air purification device provided in this embodiment can be applied to scenarios such as aircraft recirculation systems, civil ground ventilation systems, and medical negative pressure isolation wards. During operation, the air purification device draws in outside air, which then passes through a primary filter layer 10, a secondary filter layer 20, and a polymer membrane layer 30. The primary filter layer 10 initially filters out particulate matter, while the secondary filter layer 20 further filters out particulate matter and volatile organic compounds (VOCs). The polymer membrane layer 30 then inactivates microorganisms. By energizing the filter mesh 201 of the secondary filter layer, the generated heat can reactivate the catalyst on the filter mesh 201, maintaining its high efficiency in catalytic oxidation of VOCs and preventing saturation and desorption of VOCs adsorbed on the secondary filter layer 20, thus preventing secondary pollution. Simultaneously, the microorganisms captured on the polymer membrane material of the polymer membrane layer 30 are inactivated by the high-temperature radiation and thermal conductivity of the secondary filter layer 20, resulting in clean air.

[0058] Therefore, the air purification device provided in this embodiment can instantly capture, instantly inactivate (microorganisms), and instantly decompose (formaldehyde volatile organic compounds). The device does not require high-voltage electricity, is safe and reliable, has no leakage or secondary pollution, can maintain high-efficiency purification capacity for a long time, and is easy to disassemble and reuse.

[0059] Combination Figure 1 As shown, this embodiment also provides an air purification method applied to an air purification device, the air purification method including the following steps (S11)-S15).

[0060] S11) draws air into the air purification device.

[0061] S12) Primary filter layer 10 filters out solid particulate matter in the air.

[0062] S13) The secondary filter layer 20 adsorbs volatile organic compounds in the air.

[0063] S14) The polymer membrane layer 30 adsorbs microorganisms in the air.

[0064] S15) The filter cloth 201 of the secondary filter layer 20 is energized, and the catalyst laid on the filter cloth 201 catalyzes the decomposition of volatile organic compounds, and the secondary filter layer provides heat to the polymer membrane layer 30 to inactivate microorganisms.

[0065] The air purification method provided in this embodiment adsorbs outside air into the air purifier. The air passes sequentially through a primary filter layer 10, a secondary filter layer 20, and a polymer membrane layer 30. After the primary filter layer 10 performs preliminary filtration of air particles, the Joule heating effect of the filter cloth 201 of the secondary filter layer 20 is utilized under the power-on state to restore the activity of the catalyst, thereby maintaining the high efficiency of the catalyst in catalyzing the oxidation of formaldehyde and improving the service life of the filter cloth (such as the adsorbent activated carbon). Meanwhile, the microorganisms captured on the polymer membrane material of the polymer membrane layer 30 are inactivated by the high temperature radiation and thermal conduction of the secondary filter layer 20, thus obtaining clean air.

[0066] Example 2

[0067] This embodiment provides an air purification device and air purification method thereof, which includes most of the technical features of Embodiment 1. The difference is that the secondary filter layer 20 is arranged to consist of a filter subset, which includes a pair of secondary filter layers 20. A polymer membrane layer is disposed between the pair of secondary filter layers 20 to provide sufficient heat to the polymer membrane layer to restore the activity of the catalyst and maintain the high efficiency of the catalyst in catalytic oxidation of formaldehyde. At the same time, heat is provided to the polymer material of the polymer membrane layer to fully detoxify and sterilize, so as to ensure that microorganisms, including viruses, are completely inactivated.

[0068] Specifically, such as Figure 2 As shown, the air purification device is provided with a primary filter layer 10, a secondary filter layer 20a, a polymer membrane layer 30, and a secondary filter layer 20b in sequence from right to left.

[0069] Each secondary filter layer 20a and 20b has a pair of parallel electrodes 202 at its upper and lower ends. When the secondary filter layer 20a and the pair of parallel electrodes 202 are energized, the filter mesh 201 undergoes a primary Joule heating effect. When the secondary filter layer 20b and the pair of parallel electrodes 202 are energized, the filter mesh 201 undergoes a secondary Joule heating effect. Therefore, the dual Joule heating effect can better restore the activity of the catalyst and maintain the high efficiency of the catalyst in catalyzing the oxidation of formaldehyde.

[0070] from Figure 2 As can be seen, the polymer membrane layer 30 is disposed between the secondary filter layer 20a and the secondary filter layer 20b, thereby effectively detoxifying and sterilizing volatile organic compounds such as formaldehyde in the air.

[0071] Furthermore, when energized, a voltage of approximately 8V is applied to each pair of parallel electrodes 202, causing the secondary filter layers 20a and 20b to undergo a Joule heating effect to restore the activity of the catalyst and maintain its high efficiency in catalytic oxidation of formaldehyde. At the same time, heat is provided to the polymer material of the polymer membrane layer 30 to effectively detoxify and sterilize, and to extend the service life of the filter cloth (such as the adsorbent activated carbon), thereby reducing the operating cost of the air purification equipment.

[0072] In this embodiment, along the flow path of the airflow, the catalyst loading of the pair of secondary filter layers 20a and 20b decreases sequentially, that is, the catalyst loading of the secondary filter layer 20a is greater than the catalyst loading of the secondary filter layer 20b.

[0073] Furthermore, when the transition metal of the catalyst is manganese, along the flow path of the gas flow, in a corresponding pair of secondary filter layers 20a and 20b of a filter subset, if both secondary filter layers 20a and 20b use manganese (Mn) as the catalyst, the higher the manganese loading, the better the treatment effect on volatile organic compounds such as formaldehyde. However, an increase in manganese loading will negatively affect the Joule heating effect. Since the secondary filter layers have a relatively large burden on formaldehyde treatment, in this embodiment, the manganese oxide loading of secondary filter layer 20a is 8-12 wt%, and the manganese loading of the catalyst in secondary filter layer 20b is 2.5-3.5 wt%.

[0074] This embodiment provides an air purification device in which a second fixing frame 210 is provided at both the upper and lower ends of each secondary filter layer 20a, 20b for fixing the secondary filter layers 20a, 20b. The material of the second fixing frame 210 is an insulating material, such as polyvinyl chloride, whose insulation can prevent leakage of the parallel electrodes. In this embodiment, both the first fixing frame 110 and the second fixing frame 210 are detachably installed in the housing 50, which facilitates the disassembly, cleaning, and replacement of each component. The reason why the fixing frames are not provided at the upper and lower ends of the polymer membrane layer 30 in this embodiment is to ensure that the polymer membrane layer 30 is tightly sandwiched between the secondary filter layers 20a and 20b, increasing the contact area between the polymer membrane layer 30 and the secondary filter layers on both sides. This allows the secondary filter layers 20a and 20b to effectively transfer heat to the polymer membrane layer 30 and rapidly heat up when energized, increasing the heat conduction efficiency and thus rapidly inactivating the microorganisms captured on the polymer membrane material of the polymer membrane layer 30.

[0075] Therefore, the air purification device provided in this embodiment makes full use of the Joule heating characteristics of the activated carbon filter membrane layer, and makes comprehensive use of the heat supply of the filter material. Through heat conduction and radiation, it instantly and physically inactivates the microorganisms captured on the polymer material of the polymer membrane layer 30, effectively preventing the spread of bacteria and viruses and avoiding virus leakage. It is especially suitable for the current epidemic of the novel coronavirus.

[0076] Combination Figure 2 As shown, this embodiment also provides an air purification method applied to an air purification device, the air purification method including the following steps (S21)-S26).

[0077] S21) Air is drawn into the air purification device.

[0078] S22) Primary filter layer 10 filters out solid particulate matter in the air.

[0079] S23) The secondary filter layer 20a adsorbs volatile organic compounds in the air.

[0080] S24) The polymer membrane layer 30 adsorbs microorganisms in the air.

[0081] S25) The volatile organic compounds in the air are re-adsorbed through the first and second stage filter layers 20b.

[0082] S26) The filter mesh 201 of the secondary filter layers 20a and 20b is energized, and the catalyst laid on the filter mesh 201 catalyzes the decomposition of volatile organic compounds, while the secondary filter layers provide heat to the polymer membrane layer 30 to inactivate microorganisms.

[0083] The air purification method provided in this embodiment adsorbs outside air into the air purifier. The air sequentially passes through a primary filter layer 10, a secondary filter layer 20a, a polymer membrane layer 30, and a secondary filter layer 20b. The primary filter layer 10 performs preliminary filtration of air particles, followed by the secondary filter layer 20a. The Joule heating effect of the secondary filter layer 20a is utilized to restore the activity of the catalyst. The polymer membrane material of the polymer membrane layer 30 captures microorganisms, and the secondary filter layer 20b adsorbs residual formaldehyde and other volatile organic compounds. When powered on, the Joule heating effect of the filter mesh 201 of the secondary filter layers 20a and 20b is used to restore the activity of the catalyst, maintaining the high efficiency of the catalyst in catalyzing the oxidation of formaldehyde and extending the service life of the filter mesh (such as activated carbon adsorbent). Microorganisms captured on the polymer membrane material of the polymer membrane layer 30 are inactivated by the double-layer high-temperature radiation and thermal conduction of the secondary filter layers 20a and 20b, ultimately resulting in cleaner air.

[0084] Example 3

[0085] like Figure 3 As shown, this embodiment provides an air purification device and its air purification method, which includes most of the technical features of embodiment 2. The difference is that the first fixing frame 110 and the second fixing frame 210 are integrally formed frame 200. In addition, the frame 200 may be provided with a receiving groove for accommodating the primary filter layer 10 and the secondary filter layer 20, which is beneficial for the entire frame 200 to be installed in the housing 50.

[0086] Example 4

[0087] like Figure 4 As shown, this embodiment provides an air purification device and air purification method thereof, which includes most of the technical features of embodiment 2, the difference being that the secondary filter layer 20 is arranged to consist of at least one filter subset, each filter subset including a pair of adjacent secondary filter layers 20.

[0088] Specifically, the secondary filter layer 20 is arranged to consist of at least two filter subsets, each filter subset including a pair of adjacent secondary filter layers 20, and one of the filter subsets is provided with a polymer membrane layer 30 disposed between the respective pair of secondary filter layers. Furthermore, along the flow path of the gas flow, the catalyst loading of the respective pair of secondary filter layers 20 in each filter subset decreases sequentially.

[0089] Therefore, the air purification device provided in this embodiment can instantly capture, instantly inactivate (microorganisms), and instantly decompose (formaldehyde volatile organic compounds). The device does not require high-voltage electricity, is safe and reliable, has no leakage or secondary pollution, can maintain high-efficiency purification capacity for a long time, and is easy to disassemble and reuse.

[0090] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0091] The above provides a detailed description of an air purification device and air purifier provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An air purification device, comprising a primary filter layer and at least one secondary filter layer arranged sequentially along the airflow path, characterized in that, Downstream of at least one secondary filtration layer, a polymer membrane layer is provided, wherein the secondary filtration layer includes a conductive filter mesh and a catalyst laid on the filter mesh, and the filter mesh is electrically connected to a power source to form a conductive reflux; The secondary filter layer is arranged to consist of at least one filter subset, each filter subset including a pair of adjacent secondary filter layers, wherein at least one filter subset is provided with the polymer membrane layer disposed between the respective pair of secondary filter layers. The air purification device also includes: At least one pair of parallel electrodes are disposed on both sides of the filter mesh. Along the flow path of the airflow, the upstream secondary filter layer and the pair of parallel electrodes cause the filter mesh to undergo a primary Joule heating effect when energized, and the downstream secondary filter layer and the pair of parallel electrodes cause the filter mesh to undergo a secondary Joule heating effect when energized.

2. The air purification device according to claim 1, characterized in that, Along the flow path of the airflow, the catalyst loading of the corresponding pair of secondary filter layers in each filter subset decreases sequentially.

3. The air purification device according to claim 1, characterized in that, The catalyst is a transition metal; Along the flow path of the airflow, in a corresponding pair of secondary filter layers of one of the filter subsets, the loading of the transition metal of the catalyst decreases sequentially.

4. The air purification device according to claim 3, characterized in that, The catalyst's transition metal includes at least one of manganese, cobalt, and copper; The materials used for the filter mesh include activated carbon cloth and / or activated carbon fiber.

5. The air purification device according to claim 4, characterized in that, When the transition metal of the catalyst is manganese, along the flow path of the gas flow, in the corresponding pair of secondary filter layers of one of the filter subsets, the loading of manganese oxide is 8-12 wt% and 2.5-3.5 wt%, respectively.

6. The air purification device according to any one of claims 1 to 5, characterized in that, The secondary filtration layer is arranged to consist of a filtration subset, the filtration subset including a pair of secondary filtration layers, and the polymer membrane layer is disposed between the pair of secondary filtration layers.

7. The air purification device according to any one of claims 1 to 5, characterized in that, The polymer membrane is a nylon membrane with a pore size of less than or equal to 0.1 μm.

8. The air purification device according to any one of claims 1 to 5, characterized in that, The primary filter layer includes one of the following: electrostatic cotton nonwoven fabric, nylon mesh, and metal mesh.

9. The air purification device according to any one of claims 1 to 5, characterized in that, Also includes: Two first fixing frames are respectively disposed at both ends of the primary filter layer; Two second fixing frames are respectively disposed at both ends of the secondary filter layer.

10. The air purification device according to claim 9, characterized in that, The material of the second fixing frame includes polyvinyl chloride.

11. The air purification device according to claim 9, characterized in that, Also includes: The housing, the first fixing frame and the second fixing frame can be detachably installed inside the housing.

12. An air purification method applied to any one of the air purification devices according to claims 1 to 11, characterized in that, The air purification method includes the following steps: Air is drawn into the interior of the air purification device; The primary filter layer removes solid particulate matter from the air; The secondary filter layer adsorbs volatile organic compounds in the air; The polymer membrane layer adsorbs microorganisms in the air; as well as When the filter mesh of the secondary filter layer is electrified, the catalyst laid on the filter mesh catalyzes the decomposition of volatile organic compounds, and the secondary filter layer provides heat to the polymer membrane layer to inactivate microorganisms.

13. The air purification method according to claim 12, characterized in that, After the step of adsorbing microorganisms in the air by the polymer membrane layer, the air purification method further includes: The air is further adsorbed by the first and second filtration layers.

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