Air permeability balance filter

Abstract

The invention relates to an air permeability balance filter, and relates to the technical field of air purification and filtration, the air permeability balance filter comprises a shell and a multi-layer filter screen assembly, the shell is provided with an air inlet and an air outlet, and the multi-layer filter screen assembly at least comprises a first filter screen layer, a second filter screen layer and a third filter screen layer which are sequentially arranged in the air flowing direction; the first filter screen layer is an electrostatic electret HEPA filter screen, the second filter screen layer is a renewable activated carbon filter screen, the third filter screen layer is a biological enzyme catalysis filter screen, an air inlet pipeline extending out of the shell is detachably connected to the air inlet of the shell, and a temperature and humidity sensor is arranged at the position, close to the air inlet, in the air inlet pipeline. A PM2.5 detector is arranged on the side, close to the air inlet, of the first filter screen layer, a VOC detector is arranged on the side, close to the air inlet, of the second filter screen layer, and a remote control APP interface is formed in the shell. The air purification device has the effect of combining efficient air purification and intelligent regulation and control.

Description

Technical Field

[0001] This application relates to the technical field of air purification and filtration, and particularly to a breathable balance filter. Background Art

[0002] Air filters are widely used in various scenarios to improve air quality and protect people's health. With social development and technological progress, people's requirements for indoor air quality are increasing day by day. Especially in enclosed spaces, good air quality is crucial for comfort and safety. Traditional air filters mainly rely on a single filtration method and play an important role in removing particulate matter, harmful gases, etc., but it is difficult to meet the diverse needs in complex environments.

[0003] Currently, in order to address air quality problems, the industry usually adopts various means. For example, a single - layer HEPA filter is used to capture particulate matter, an activated carbon filter is used to adsorb odors and harmful gases, or an ultraviolet germicidal device is set up separately to kill bacteria and viruses. In addition, there are also products that improve the dry environment by adding a humidity - regulating function, or use sensors to monitor parameters such as temperature and humidity to achieve basic environmental perception capabilities. Although these methods have their own focuses, they often have limitations in practical applications.

[0004] However, air filters in the prior art generally face problems such as poor breathability and uneven pressure distribution. At the same time, due to the lack of an effective multi - level filtration coordination mechanism, the overall efficiency is low. Especially when faced with the rapid deterioration of air quality caused by frequent human activities in enclosed spaces, the traditional single - filtration method cannot respond in time and comprehensively optimize air quality. There is an urgent need for a technical solution that can comprehensively solve the above - mentioned defects. Summary of the Invention

[0005] In order to combine efficient air purification and intelligent regulation, this application provides a breathable balance filter.

[0006] This application provides a breathable balance filter, adopting the following technical solutions: An air permeability balance filter, comprising a housing and a multi-layer filter screen assembly installed inside the housing. Air inlets and air outlets are respectively provided at both ends of the housing along the air flow direction. The multi-layer filter screen assembly at least includes a first filter screen layer, a second filter screen layer and a third filter screen layer arranged in sequence along the air flow direction. The first filter screen layer is an electrostatic electret HEPA filter screen, the second filter screen layer is a regenerable activated carbon filter screen, and the third filter screen layer is a bio-enzyme catalytic filter screen. A wind inlet pipe extending outside the housing is detachably connected to the air inlet of the housing. A temperature and humidity sensor is provided inside the wind inlet pipe near the air inlet. A PM2.5 detector is provided on the side of the first filter screen layer close to the air inlet. A VOC detector is provided on the side of the second filter screen layer close to the air inlet. A remote control APP interface is provided on the housing for users to view the device status and adjust the set value through an application program that provides detailed air quality reports and historical record query services.

[0007] By adopting the above technical solutions, the effective cooperation between the multi-layer filter screen assembly and various sensors is realized, and the overall performance of the air purifier is improved. The electrostatic electret HEPA filter screen as the first filter screen layer can efficiently capture ultrafine particles and significantly improve the filtration efficiency of small particle pollutants in the air. The regenerable activated carbon filter screen as the second filter screen layer has the ability to adsorb harmful gases for a long time and can be restored by washing, extending the service life and reducing the maintenance cost. The bio-enzyme catalytic filter screen as the third filter screen layer focuses on decomposing formaldehyde and other toxic chemical substances, avoiding secondary pollution and ensuring that the discharged air is cleaner and safer. The temperature and humidity sensor is installed inside the wind inlet pipe near the air inlet to monitor the temperature and humidity data of the incoming air in real time, providing a basis for subsequent regulation. The PM2.5 detector is set near the first filter screen layer to accurately measure the PM2.5 concentration in the air, facilitating timely adoption of corresponding purification measures. The VOC detector is arranged on the front side of the second filter screen layer to detect the content of volatile organic compounds, further ensuring the comprehensiveness of air quality monitoring. The design of the remote control APP interface allows users to master the device operation status at any time through a mobile application program, obtain detailed air quality reports and historical records, and realize intelligent management and personalized settings.

[0008] Optionally, a pre-filter screen layer is slidably connected inside the wind inlet pipe. The pre-filter screen layer is located between the temperature and humidity sensor and the multi-layer filter screen assembly. A slide rail extending along the air flow direction is provided inside the wind inlet pipe. The internal area of the side of the wind inlet pipe close to the housing is larger than the area of the air inlet. One end of the slide rail close to the air inlet passes through the pre-filter screen layer and is fixedly connected to the housing.

[0009] By adopting the above technical solutions, the pre-filter screen layer can effectively intercept larger particulate matters, reduce the burden on the subsequent filter screens, and extend the service life of the multi-layer filter screen assembly. The design of the slide rail makes the pre-filter screen layer easy to disassemble, assemble and clean, improving the maintenance convenience. The inner area of one side of the air inlet duct close to the housing is larger than the area of the air inlet, enabling one side of the pre-filter screen layer to abut against the outer wall of the housing, and clamping the pre-filter screen layer through the fixation of the temperature and humidity sensor.

[0010] Optionally, the pre-filter screen layer is woven from polyester fibers, and a rubber sealing frame is provided along the circumferential direction on the outer side wall of the pre-filter screen layer.

[0011] By adopting the above technical solutions, the pre-filter screen layer woven from polyester fibers can effectively intercept large particle impurities, reduce the burden on the subsequent filter screen layer, and extend the service life of the entire filtration system. At the same time, the design of the rubber sealing frame ensures good airtightness between the pre-filter screen layer and the air inlet duct, preventing unfiltered air from bypassing the filter screen layer, thereby improving the filtration efficiency and air quality.

[0012] Optionally, a first fan and a second fan are arranged along the same axis inside the housing, and the first fan and the second fan are arranged in sequence between the air inlet of the housing and the multi-layer filter screen assembly.

[0013] By adopting the above technical solutions, efficient air circulation and pressure balance inside the filter are achieved. The arrangement of the first fan and the second fan can enhance the power of air inhalation and discharge, ensuring that air smoothly passes through the multi-layer filter screen assembly, thereby improving the overall filtration efficiency and reducing the air flow resistance. Specifically, the design of the dual fans helps to optimize the air permeability, reduce energy consumption while ensuring the filtration effect, and enhance the user experience.

[0014] Optionally, a flow guide cylinder is fixedly connected to the outlet of the first fan, and the end of the flow guide cylinder away from the first fan extends to a position close to the inlet of the second fan. A flow guide cover is fixedly connected to the outlet of the second fan, and the flow guide cover is conically arranged. The large diameter end of the flow guide cover matches the outlet of the second fan, and the small diameter end of the flow guide cover extends to a position close to the first filter screen layer. The PM2.5 detector is located between the flow guide cover and the first filter screen layer, and there is a spacing between the small diameter end of the flow guide cover and the PM2.5 detector.

[0015] By adopting the above technical solutions, the design of the dual fans in cooperation with the draft tube and the air deflector can significantly improve the air circulation efficiency and optimize the air flow distribution. Specifically, the draft tube is arranged at the outlet of the first fan, which can effectively guide the air flow to concentrate at the inlet of the second fan, reduce the eddy current loss, and improve the conveying capacity; the conical air deflector at the outlet of the second fan further promotes the smooth transition of the air flow to the vicinity of the first filter layer, ensuring uniform force on the filtering area and enhancing the filtering effect. At the same time, a spacing is reserved between the small-diameter end of the air deflector and the PM2.5 detector, avoiding measurement errors caused by excessive compression of the air flow and ensuring the authenticity and accuracy of the particulate matter concentration monitoring data.

[0016] Optionally, a microclimate adjustment device is installed at one end of the interior of the housing near the air outlet, and the microclimate adjustment device is fixedly connected to the bottom of the housing.

[0017] By adopting the above technical solutions, the microclimate adjustment device can effectively improve the user experience of the air purifier. The microclimate adjustment device is installed at one end of the interior of the housing near the air outlet. This position design enables the air purified by multiple filter layers to directly enter the microclimate adjustment link, thereby further optimizing the air quality. The overall design scheme ensures the intelligence and automation during the operation of the device, and can maintain an ideal working state without frequent manual intervention, improving the convenience and satisfaction of users.

[0018] Optionally, the microclimate adjustment device includes an evaporative humidifier and a UV-C ultraviolet lamp tube. The evaporative humidifier uses ultrasonic atomization technology to generate water mist particles for air humidification treatment, and the UV-C ultraviolet lamp tube is made of a low-pressure mercury lamp.

[0019] By adopting the above technical solutions, the evaporative humidifier can effectively increase the indoor air humidity and improve the discomfort caused by dryness; the UV-C ultraviolet lamp tube has a strong sterilization and disinfection ability, which can kill germs and viruses in the air and ensure the hygienic safety of the breathing environment. The combination of these two functions creates a more comfortable and healthy indoor microclimate condition.

[0020] Optionally, the multi-layer filter assembly further includes a plurality of sealing rings, and grooves for embedding the sealing rings are provided on one side of the first filter layer close to the second filter layer, on both sides of the second filter layer, and on one side of the third filter layer close to the second filter layer.

[0021] By adopting the above technical solutions, the sealing performance between the multi-layer filter assemblies is increased, effectively preventing unfiltered air from entering the air outlet through the gaps between the filter layers, thereby improving the overall filtering efficiency and air quality. At the same time, the assembly stability between the filter layers is optimized, and the service life of the device is extended.

[0022] Optionally, the housing includes an upper shell and a lower shell that are symmetric along the horizontal plane. The upper shell and the lower shell are detachably connected. The microclimate adjustment device is fixedly connected to the lower shell, and both the PM2.5 detector and the VOC detector are fixedly connected to the upper shell. Circumferential grooves for inserting multi-layer filter assemblies are fixedly provided on the inner circumferences of both the upper shell and the lower shell. The groove is located on one side of the annular groove away from the side wall of the housing.

[0023] By adopting the above technical solution, the upper and lower split design of the housing is realized, which is convenient for the assembly, maintenance, and cleaning of the device. The detachable connection method of the upper shell and the lower shell simplifies the replacement process of the multi-layer filter assembly and improves the user experience. The circumferential annular groove design further optimizes the positioning and fixing effect of the multi-layer filter assembly, and the ingenious layout of the groove position enhances the sealing performance, effectively preventing pollutant leakage and improving the overall filtration efficiency and reliability.

[0024] Optionally, a support frame for shock absorption and noise reduction is fixedly connected to the lower end surface of the outer side of the housing by screws. The support frame is composed of aluminum alloy profiles.

[0025] By adopting the above technical solution, the support frame can effectively reduce the vibration and noise generated during the operation of the device and improve the user experience. The use of high-strength aluminum alloy profiles ensures that the support frame has good load-bearing capacity and durability, while maintaining a relatively light weight, which is convenient for installation and transportation.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The combined use of an electrostatic electret HEPA filter, a renewable activated carbon filter, and a bio-enzyme catalytic filter can effectively remove fine particles, volatile organic compounds, and other harmful substances in the air, achieving efficient filtration of various types of pollutants and solving the problem that a single filter in the prior art is difficult to comprehensively purify. 2. A temperature and humidity sensor, a PM2.5 detector, and a VOC detector are arranged in the air inlet duct. In combination with the remote control APP interface, the air quality can be monitored in real time and a detailed report can be provided. Users can conveniently obtain data and adjust the device settings through the application program, improving the intelligent level of device use. 3. The microclimate adjustment device integrates an evaporative humidifier and a UV-C ultraviolet lamp tube, which can not only increase the air humidity but also further sterilize and disinfect, optimizing the overall comfort and health safety of the indoor environment. Description of the Drawings

[0027] Figure 1 is an overall structural schematic diagram of a breathable balance filter.

[0028] Figure 2 is Figure 1 a structural schematic diagram after hiding the air inlet duct and the upper shell.

[0029] Figure 3 is Figure 1 A schematic cross-sectional view along a vertical plane.

[0030] Description of reference numerals: 1. Housing; 11. Air inlet; 12. Air outlet; 13. PM2.5 detector; 14. VOC detector; 15. First fan; 151. Flow guide cylinder; 16. Second fan; 161. Flow guide cover; 17. Microclimate regulation device; 171. Evaporative humidifier; 172. UV-C ultraviolet lamp tube; 18. Upper shell; 181. Ring groove; 19. Lower shell; 2. Multi-layer filter assembly; 21. First filter layer; 22. Second filter layer; 23. Third filter layer; 24. Sealing ring; 25. Groove; 3. Air inlet pipe; 31. Temperature and humidity sensor; 32. Slide rail; 33. Pre-filter layer; 331. Rubber sealing frame; 4. Support frame. Detailed implementation manners

[0031] The following further describes the present application in detail with reference to all the drawings.

[0032] An embodiment of the present application discloses a breathability balance filter.

[0033] Referring to Figure 1 , a breathability balance filter includes a housing 1. The lower end face of the outer side of the housing 1 is fixedly connected by screws with a support frame 4 for shock absorption and noise reduction, and the support frame 4 is made of aluminum alloy profiles. The support frame 4 can effectively reduce the vibration and noise generated during the operation of the equipment, and improve the user experience. The use of high-strength aluminum alloy profiles ensures that the support frame 4 has good load-bearing capacity and durability, and at the same time maintains a relatively light mass, which is convenient for installation and transportation. Referring to Figure 2 , a multi-layer filter assembly 2 is installed inside the housing 1, and the multi-layer filter assembly 2 at least includes a first filter layer 21, a second filter layer 22 and a third filter layer 23 arranged in sequence along the air flow direction.

[0034] Referring to Figure 2, the first filter layer 21 includes a high-efficiency electrostatic electret HEPA filter main body and a surrounding pressing frame, and the pressing frame is made of lightweight aluminum alloy profiles. The high-efficiency electrostatic electret HEPA filter mainly includes a polypropylene non-woven fabric substrate and a permanent charge layer carried on its surface. This filter can be made of polypropylene material with a thickness of about 3mm - 5mm and a relatively high density to form a dense and interlaced fiber network structure, so as to effectively capture particles as small as 0.3 microns and above. For example, it can be woven from PP fiber or glass fiber material, with a thickness of about 2mm - 3mm, and a special nano-coating is sprayed on the surface to extend the service life and maintain a high dust collection efficiency. Although the cost is slightly higher, it has better tear resistance and durability. As an alternative, a composite HEPA filter with antibacterial function can also be used, and the purpose of inhibiting bacterial reproduction is achieved by doping silver ions.

[0035] Refer to Figure 2 , the second filter layer 22 is a regenerable activated carbon filter, and the regenerable activated carbon filter mainly includes an activated carbon filling unit and its outer shell encapsulation. Its core component is a core absorption area filled with high-quality activated carbon particles extracted from coconut shells. These particles usually have a large specific surface area and can effectively adsorb various organic volatile compounds and other harmful gas components. It should be noted that the particle size of the filler can be adjusted according to the actual situation. For example, particles with an average diameter of about 0.5mm - 2mm are selected, which can not only ensure sufficient adsorption capacity but also not overly impede air circulation. To facilitate later replacement and maintenance, a nylon mesh bag with good air permeability can be wrapped outside the activated carbon layer, which is convenient to take and can prevent powder from scattering and polluting other parts. The outer shell encapsulation is usually injection-molded from food-grade ABS engineering plastic, and its shape presents a rectangular box structure, with ventilation holes reserved around to promote air circulation. If a longer maintenance-free period is pursued, a small amount of rare earth element catalyst can be mixed into the activated carbon powder, which helps the regeneration process under high-temperature conditions to be safer and faster.

[0036] Refer to Figure 2 , the third filter layer 23 is a bio-enzyme catalytic filter, and the bio-enzyme catalytic filter includes a bio-enzyme catalytic carrier membrane and its support skeleton. The bio-enzyme catalytic carrier membrane is prepared based on natural plant extracts and is pressed into a long strip and thin sheet shape after low-temperature freeze-drying treatment, which can effectively decompose harmful gas molecular chains. Considering cost factors, artificial synthetic biomimetic peptide compounds can also be tried to replace products from natural sources, and their performance indicators are basically the same.

[0037] Refer to Figure 2 and Figure 3, at both ends of the housing 1 along the air flow direction, an air inlet 11 and an air outlet 12 are respectively provided. At the air inlet 11 of the housing 1, an air inlet duct 3 extending outward of the housing 1 is detachably connected. A pre-filter layer 33 is slidably connected in the air inlet duct 3. The pre-filter layer 33 can effectively intercept larger particulate matters, reduce the burden on the subsequent filters, and extend the service life of the multi-layer filter assembly 2. A slide rail 32 extending along the air flow direction is provided in the air inlet duct 3. One end of the slide rail 32 close to the air inlet 11 passes through the pre-filter layer 33 and is fixedly connected to the housing 1. The pre-filter layer 33 is woven from polyester fibers. The pre-filter layer 33 woven from polyester fibers can effectively intercept large particle impurities, reduce the burden on the subsequent filter layers, and extend the service life of the entire filtration system. A rubber sealing frame 331 is provided on the outer side wall of the pre-filter layer 33 along the circumferential direction. The design of the rubber sealing frame 331 ensures good sealing between the pre-filter layer 33 and the air inlet duct 3, avoiding unfiltered air bypassing the filter layer, thereby improving the filtration efficiency and air quality.

[0038] Refer to Figure 2 , the multi-layer filter assembly 2 further includes a plurality of flexible silicone rubber sealing rings 24. Grooves 25 for embedding the sealing rings 24 are provided on one side of the first filter layer 21 close to the second filter layer 22, on both sides of the second filter layer 22, and on one side of the third filter layer 23 close to the second filter layer 22, so as to isolate the air leakage between adjacent layers and ensure the independence and integrity of each stage of the filtration process. Especially in the dynamic operating state, this method helps to maintain a stable local negative pressure environment, and then promotes the orderly passage of air through each layer of filter to achieve the best purification efficiency.

[0039] Refer to Figure 2 , the housing 1 is composed of two parts, namely an upper shell 18 and a lower shell 19, which are detachably connected by bolts or buckles. Ring grooves 181 are provided inside both the upper shell 18 and the lower shell 19 for inserting the multi-layer filter assembly 2. The groove 25 is located on one side of the ring groove 181 away from the side wall of the housing 1. Limit protrusions can be provided on the inner side wall of the ring groove 181 to ensure accurate positioning of the filter assembly. Both the upper shell 18 and the lower shell 19 are detachably connected to the air inlet duct 3 by bolts.

[0040] Refer to Figure 2 and Figure 3 , this embodiment also is provided with an integrated multi-modal sensing and intelligent control platform, integrating a temperature and humidity sensor 31, a PM2.5 detector 13 and a VOC detector 14.

[0041] Refer to Figure 2 and Figure 3, Specifically, a temperature and humidity sensor 31 is provided inside the air inlet duct 3 near the air inlet 11, which can monitor the temperature and humidity data of the incoming air in real time and provide a basis for subsequent regulation. The temperature and humidity sensor 31 preferably uses an NTC thermistor sensing head, which is small in size and high in sensitivity. A PM2.5 detector 13 is provided on one side of the first filter layer 21 near the air inlet 11 to accurately measure the PM2.5 concentration in the air, facilitating the timely adoption of corresponding purification measures. The PM2.5 detector 13 measures the particle concentration by the laser scattering method, and the resolution is better than 0.1 μg / m³. A VOC detector 14 is provided on one side of the second filter layer 22 near the air inlet 11 to detect the content of volatile organic compounds and further ensure the comprehensiveness of air quality monitoring. The VOC detector 14 is developed based on the PID photoionization principle, and the lowest detection limit is as low as the ppb level. These three instruments work together to collect indoor air quality data in real time and upload it to the central processing unit for analysis and judgment. Subsequently, according to the algorithm model, the corresponding working mode conversion mechanism is automatically triggered - when the air is detected to be too dry, it switches to the humidification mode; conversely, if the humidity is too high, the dehumidification program is enabled; and in case of a sudden heavy pollution situation, the strong purification process is immediately started. In this way, it can be ensured that the device is always in the best operating state most suitable for the current environmental requirements. There is also a remote control APP interface on the housing 1 for users to view the device status and adjust the set values by providing a detailed air quality report and historical record query service, realizing intelligent management and personalized settings.

[0042] Refer to Figure 2 , Inside the housing 1, a first fan 15 and a second fan 16 are arranged along the same axis. The first fan 15 and the second fan 16 are arranged in sequence between the air inlet 11 of the housing 1 and the multi-layer filter assembly 2 to accelerate the air circulation speed. A cylindrical guide cylinder 151 is fixedly connected to the outlet of the first fan 15. One end of the guide cylinder 151 away from the first fan 15 extends to near the inlet of the second fan 16, and the inner wall of the guide cylinder 151 is smooth and flat, which is conducive to guiding the air flow to be transmitted downstream and concentrated. The end opening of the guide cylinder 151 is accurately docked near the central part of the inlet area of the adjacent second fan 16 to avoid eddy current disorder interference caused by deflection.

[0043] Refer to Figure 2 , A guide cover 161 is fixedly connected to the outlet of the second fan 16. The guide cover 161 is conical. The large diameter end of the guide cover 161 matches the outlet of the second fan 16, and the small diameter end of the guide cover 161 extends to near the first filter layer 21, which can minimize energy loss and at the same time promote more untreated original mixture to flow through the detection element to receive real-time monitoring feedback information to guide the formulation of subsequent operation decisions.

[0044] Refer to Figure 2 and Figure 3, the pre-filter layer 33 is located between the temperature and humidity sensor 31 and the multi-layer filter assembly 2. A bracket is connected to the upper end of the temperature and humidity sensor 31, and is bolted and fastened to the upper end inside the air inlet duct 3 through the bracket. When the air inlet duct 3 is bolted and fastened to the housing 1, since the internal area of the side of the air inlet duct 3 close to the housing 1 is larger than the area of the air inlet 11, the bracket connected to the temperature and humidity sensor 31 and the outer wall of the housing 1 jointly clamp the pre-filter layer 33. Coupled with the fact that the pre-filter layer 33 slides on the slide rail 32, the fixation of the pre-filter layer 33 is jointly achieved.

[0045] Refer to Figure 2 , the PM2.5 detector 13 is located between the flow guide cover 161 and the first filter layer 21, and there is a gap between the small-diameter end of the flow guide cover 161 and the PM2.5 detector 13, avoiding measurement errors caused by excessive compression of the air flow and ensuring the authenticity and accuracy of the particulate matter concentration monitoring data. A bracket is also connected to the upper end of the PM2.5 detector 13, and the bracket is bolted and fastened to the upper housing 18.

[0046] Refer to Figure 2 and Figure 3 , the VOC detector 14 is located between the first filter layer 21 and the second filter layer 22. A bracket is also connected to the upper end of the VOC detector 14, and the bracket is bolted and fastened to the upper housing 18. Since a sealing ring 24 is provided between the first filter layer 21 and the second filter layer 22, a gap for the bracket to pass through is opened on the sealing ring 24. This gap is in close fit with the bracket through the extrusion of the sealing ring 24 by the first filter layer 21 and the second filter layer 22.

[0047] Refer to Figure 2 , in order to further improve the user's comfort experience, a microclimate adjustment device 17 is installed at one end of the housing 1 close to the air outlet 12, and the microclimate adjustment device 17 is fixedly connected to the bottom of the lower housing 19. The microclimate adjustment device 17 includes an evaporative humidifier 171 and a UV-C ultraviolet lamp. The evaporative humidifier 171 selects a small device, and the evaporative humidifier 171 uses ultrasonic atomization technology to generate water mist particles for air humidification treatment. The UV-C ultraviolet lamp is made of a low-pressure mercury lamp and is used for sterilization and disinfection. The low-pressure mercury lamp refers to a mercury vapor arc lamp with a mercury vapor pressure of 1.3 - 13 Pa, mainly emitting at a wavelength of 253.7 nm in the ultraviolet region, with an energy of 471.0 kJ / mol, accounting for 70% of the total energy of the lamp. The microclimate adjustment device 17 can automatically adjust the humidity and kill germs according to environmental requirements, providing a healthier indoor air environment.

[0048] The implementation principle of an air permeability balance filter in an embodiment of this application is as follows: The electrostatic electret HEPA filter screen serves as the first filter screen layer 21, which can efficiently capture ultrafine particles and significantly improve the filtration efficiency of small particulate pollutants in the air. The regenerable activated carbon filter screen serves as the second filter screen layer 22, which has the ability to adsorb harmful gases for a long time and can be restored by washing, extending the service life and reducing the maintenance cost. The bio-enzyme catalytic filter screen serves as the third filter screen layer 23, which focuses on decomposing formaldehyde and other toxic chemical substances, avoiding secondary pollution, and ensuring that the discharged air is cleaner and safer. The temperature and humidity sensor 31 is installed near the air inlet 11 in the air inlet duct 3, and can monitor the temperature and humidity data of the incoming air in real time, providing a basis for subsequent regulation. The PM2.5 detector 13 is set near the first filter screen layer 21 to accurately measure the PM2.5 concentration in the air, facilitating the timely adoption of corresponding purification measures. The VOC detector 14 is arranged on the front side of the second filter screen layer 22 to detect the content of volatile organic compounds, further ensuring the comprehensiveness of air quality monitoring. The design of the remote control APP interface allows users to master the operating status of the device at any time through a mobile application, obtain detailed air quality reports and historical records, and achieve intelligent management and personalized settings.

[0049] The above are all the preferred embodiments of this application. Without restricting the protection scope of this application accordingly, therefore: All equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An air permeability balance filter, comprising a housing (1) and a multi-layer filter screen assembly (2) installed inside the housing (1). The two ends of the housing (1) along the air flow direction are respectively provided with an air inlet (11) and an air outlet (12), and it is characterized in that: The multi-layer filter assembly (2) at least includes a first filter layer (21), a second filter layer (22), and a third filter layer (23) arranged in sequence along the air flow direction. The first filter layer (21) is an electrostatic electret HEPA filter, the second filter layer (22) is a regenerable activated carbon filter, and the third filter layer (23) is a bio-enzyme catalytic filter. A detachable air inlet duct (3) extending outside the housing (1) is connected to the air inlet (11) of the housing (1). A temperature and humidity sensor (31) is provided inside the air inlet duct (3) near the air inlet (11). A PM2.5 detector (13) is provided on the side of the first filter layer (21) near the air inlet (11). A VOC detector (14) is provided on the side of the second filter layer (22) near the air inlet (11). The housing (1) is provided with a remote control APP interface for users to view the device status and adjust the set value by providing detailed air quality reports and historical record query services.

2. The air-permeable balance filter according to claim 1, wherein: A pre-filter layer (33) is slidably connected inside the air inlet duct (3). The pre-filter layer (33) is located between the temperature and humidity sensor (31) and the multi-layer filter assembly (2). A slide rail (32) extending along the air flow direction is provided inside the air inlet duct (3). The inner area of the side of the air inlet duct (3) close to the housing (1) is larger than the area of the air inlet (11). One end of the slide rail (32) close to the air inlet (11) passes through the pre-filter layer (33) and is fixedly connected to the housing (1).

3. The air-permeable balance filter according to claim 2, wherein: The pre-filter layer (33) is woven from polyester fibers. A rubber sealing frame (331) is provided along the circumference on the outer side wall of the pre-filter layer (33).

4. The air-permeable balance filter according to claim 1, wherein: A first fan (15) and a second fan (16) are provided inside the housing (1) along the same axis. The first fan (15) and the second fan (16) are arranged in sequence between the air inlet (11) of the housing (1) and the multi-layer filter assembly (2).

5. The air-permeability balanced filter according to claim 4, wherein: A flow guide cylinder (151) is fixedly connected to the outlet of the first fan (15). One end of the flow guide cylinder (151) away from the first fan (15) extends to near the inlet of the second fan (16). A flow guide cover (161) is fixedly connected to the outlet of the second fan (16). The flow guide cover (161) is conical. The large diameter end of the flow guide cover (161) matches the outlet of the second fan (16). The small diameter end of the flow guide cover (161) extends to near the first filter layer (21). The PM2.5 detector (13) is located between the flow guide cover (161) and the first filter layer (21), and there is a gap between the small diameter end of the flow guide cover (161) and the PM2.5 detector (13).

6. A breathable balance filter according to claim 1, characterized in that: A microclimate adjustment device (17) is installed at one end of the housing (1) near the air outlet (12). The microclimate adjustment device (17) is fixedly connected to the bottom of the housing (1).

7. An air-permeable balance filter according to claim 6, characterized in that: The microclimate adjustment device (17) includes an evaporative humidifier (171) and a UV-C ultraviolet lamp tube. The evaporative humidifier (171) uses ultrasonic atomization technology to generate water mist particles for air humidification treatment. The UV-C ultraviolet lamp tube is made of a low-pressure mercury lamp.

8. The air-permeability balance filter according to claim 6, characterized in that: The multi-layer filter assembly (2) further includes a plurality of sealing rings (24). Grooves (25) for embedding the sealing rings (24) are formed on one side of the first filter layer (21) close to the second filter layer (22), on both sides of the second filter layer (22), and on one side of the third filter layer (23) close to the second filter layer (22).

9. The air-permeable balance filter according to claim 8, characterized in that: The housing (1) includes an upper housing (18) and a lower housing (19) that are symmetric along the horizontal plane. The upper housing (18) and the lower housing (19) are detachably connected. The microclimate adjustment device (17) is fixedly connected to the lower housing (19), and both the PM2.5 detector (13) and the VOC detector (14) are fixedly connected to the upper housing (18). Annular grooves (181) for inserting the multi-layer filter assembly (2) are fixedly provided on the inner circumferences of both the upper housing (18) and the lower housing (19). The groove (25) is located on one side of the annular groove (181) away from the side wall of the housing (1).

10. The air-permeable balance filter according to claim 1, wherein: A support frame (4) for shock absorption and noise reduction is fixedly connected to the lower end face on the outside of the housing (1) by screws. The support frame (4) is made of aluminum alloy profiles.

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