Air purifying device and purification method thereof

Abstract

The application discloses an air purification device and a purification method thereof, and belongs to the field of air purification. The air purification device comprises a first-stage purification unit, an air inlet pipeline is arranged on the first-stage purification unit, and external air is introduced into the air inlet pipeline to make particulate matters in the air agglomerate through ultrasonic waves; a second-stage purification unit is arranged with a water tank connected with the air inlet pipeline, air treated by the first-stage purification unit is introduced into water, and air bubbles and water drops are generated through ultrasonic waves to adsorb particulate matters in the air; and a third-stage purification unit is arranged with an air outlet pipeline connected with the water tank, and harmful gas molecules in the air are removed through activated carbon adsorption and ultraviolet photolysis. The device has the advantages of high efficiency, agility and difficulty in blockage, can greatly reduce the number of fine particulate matters PM2.5 in the air, simultaneously removes toxic and harmful gases in the air through adsorption and photolysis technology, and can meet engineering application.

Description

Technical Field

[0001] This invention relates to the field of air purification, specifically to an air purification device and its purification method. Background Technology

[0002] In weather conditions such as sandstorms and smog, there are a lot of suspended particulate pollutants in the air. In aerodynamics, suspended particulate matter with an equivalent diameter of less than or equal to 2.5 micrometers is called PM2.5. PM2.5 can easily enter the human respiratory system and cause respiratory problems, which can seriously affect human health.

[0003] Currently, the main strategy for controlling sandstorms and smog is prevention, such as controlling pollutant emissions in advance or planting trees. However, methods for controlling existing sandstorms and smog are very limited. The key to eliminating smog lies in removing PM2.5 from the atmosphere, which is generally dispersed by wind or falls to the ground with rain. Some industries require outdoor work that exposes workers to the atmosphere, and the unavoidable sandstorms and smog can seriously affect their health. In such cases, existing technology uses fans to directly circulate dust-laden air into water to reduce PM2.5 levels in the area. However, this method is not thorough enough in removing PM2.5 and does not effectively remove some toxic and harmful substances from the air. Furthermore, sandstorms often disrupt indoor ventilation systems in offices and commercial spaces, preventing the supply of fresh air. Existing home air purifiers are typically small, low-power, and expensive, making them unsuitable for outdoor, industrial, and large commercial environments. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an air purification device and method that can significantly reduce the number of fine particulate matter in the air and remove toxic and harmful gases from the air, thereby meeting the needs of more application scenarios.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides an air purification device, characterized by comprising: a first-stage purification unit equipped with an air inlet pipe, through which outside air is introduced and ultrasonic waves are used to agglomerate particulate matter in the air; a second-stage purification unit equipped with a water tank connected to the air inlet pipe, through which air treated by the first-stage purification unit is introduced and ultrasonic waves are used to generate bubbles and water droplets to adsorb particulate matter in the air; and a third-stage purification unit equipped with an air outlet pipe connected to the water tank, through activated carbon adsorption and ultraviolet photolysis to remove harmful gas molecules in the air.

[0007] Furthermore, the air purification device provided by the present invention may also have the following features: the first-stage purification unit includes: a fan, a first ultrasonic generator, an ultrasonic transducer, and a multi-stage air outlet; the fan is connected to the inlet of the air inlet pipe; the air inlet pipe has an upward airflow section, a straight airflow section, and a downward airflow section; the first ultrasonic generator is electrically connected to the ultrasonic transducer, and the ultrasonic transducer is mounted on the pipe wall of the upward airflow section; the bottom of the upward airflow section is connected to a ash discharge port; the end of the downward airflow section extends below the liquid surface of the water tank, and the multi-stage air outlet is installed at the end of the downward airflow section.

[0008] Furthermore, the air purification device provided by the present invention may also have the following feature: wherein the ultrasonic transducers include several groups arranged from top to bottom in the rising airflow pipe section, and each group consists of two ultrasonic transducers respectively disposed on the left and right sides of the pipe wall.

[0009] Furthermore, the air purification device provided by the present invention may also have the following feature: wherein a zoom nozzle, a flow meter, and an air valve are sequentially arranged on the straight airflow pipe section.

[0010] Furthermore, the air purification device provided by the present invention may also have the following features: wherein the second-stage purification unit includes: a second ultrasonic generator and an ultrasonic transducer; the second ultrasonic generator is electrically connected to the ultrasonic transducer, and the number of ultrasonic transducers is several, and the several ultrasonic transducers are arranged in a rectangular pattern on the top of the water tank.

[0011] Furthermore, the air purification device provided by the present invention may also have the following features: wherein the second-stage purification unit includes: a liquid level probe and a buzzer; the liquid level probe is used to monitor whether the liquid level in the water tank exceeds the rated liquid level height; the buzzer is linked with the liquid level probe and issues an alarm when the liquid level probe detects that the liquid level in the water tank exceeds the rated liquid level height.

[0012] Furthermore, the air purification device provided by the present invention may also have the following feature: the water tank is a double-layered cuboid, and the double layer is filled with sound-insulating cotton.

[0013] Furthermore, the air purification device provided by the present invention may also have the following feature: wherein the third-stage purification unit includes a drying tube, a converging nozzle, activated carbon, a diverging nozzle, and an ultraviolet lamp arranged sequentially on the air outlet pipe.

[0014] The present invention also provides an air purification method, which employs the above-mentioned air purification device, characterized by comprising the following steps:

[0015] 1) Preparation: Add or drain water into the water tank to bring the liquid level to the rated height;

[0016] 2) First-stage purification: Turn on the fan to allow outside air to enter the air intake pipe, and close the air valve to prevent communication between the first and second purification units; then, turn on the first ultrasonic generator, causing the fine particles in the air in the air intake pipe to agglomerate into larger particles under the action of the standing wave sound field formed by the ultrasonic transducer, and settle to the ash discharge port under the action of gravity; after that, the air enters the expansion and contraction nozzle until the flow meter reaches the rated value.

[0017] 3) Second stage purification: After the flow meter reaches the rated value, the air valve is opened to connect the first purification unit and the second purification unit. Air enters the water tank below the water surface through the multi-stage air outlet. Then, the second ultrasonic generator is turned on. The ultrasonic transducer emits ultrasonic waves to generate microbubbles and micro water droplets in the water to adsorb particulate matter.

[0018] 4) Third-stage purification: Air enters the drying tube for drying, then passes through the converging nozzle to increase the airflow speed, and then enters the activated carbon to adsorb harmful gas molecules. After passing through the expanding nozzle to reduce the airflow speed, the harmful gas molecules are decomposed by ultraviolet light, and finally clean air is discharged.

[0019] Furthermore, the air purification method provided by the present invention may also have the following feature: wherein the volumetric flow rate of the air entering the water tank is 1 / 8 to 1 / 6 of the volume of water in the water tank.

[0020] The beneficial effects of this invention are:

[0021] The air purification device of this invention consists of three stages of purification. The first stage uses a standing wave sound field generated by an ultrasonic transducer to agglomerate fine particulate matter in the airflow, causing it to cluster into larger particles that then settle under gravity. This first stage is effective for moderately to heavily polluted air; the higher the air concentration, the better the agglomeration effect, reducing PM2.5 levels by nearly half. The remaining air then undergoes a second stage of purification. Air is introduced into water, where the ultrasonic transducer generates strong bubbles and tiny water droplets. These bubbles and droplets contact and adsorb PM2.5 particles, removing them from the air and lowering PM2.5 levels. Finally, the air undergoes a third stage of purification. First, the gas is dried, then purified using activated carbon adsorption and ultraviolet photolysis. Activated carbon effectively adsorbs harmful gas molecules such as formaldehyde and benzene, while ultraviolet light kills bacteria, viruses, fungi, and other microorganisms. Additionally, ultraviolet light photolyzes malodorous gases such as benzene, toluene, xylene, non-methane hydrocarbons, ammonia, and sulfides. Polluted air is purified through three stages by the air purification device of this invention to obtain dry and fresh air.

[0022] The device of this invention overcomes the shortcomings of activated carbon adsorption technology, which can only adsorb gaseous harmful substances and has poor filtration effect on particulate matter and other pollutants. It also overcomes the limitation of ultrasound, which can only agglomerate fine particles and cannot remove toxic and harmful substances from the air. This device can significantly reduce fine particulate matter in the air while simultaneously removing toxic and harmful gases, resulting in fresh, dry air. Furthermore, this device is suitable for engineering applications. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the air purification device in an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 Enlarged view at point A;

[0025] Figure 3 This is a three-dimensional structural schematic diagram of the multi-stage air outlet in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the arrangement of multiple ultrasonic transducers on the water tank in an embodiment of the present invention;

[0027] In the diagram: 1: Fan; 2: Air inlet pipe; 3: Ash discharge port; 41: First ultrasonic generator; 42: Second ultrasonic generator; 5: Ultrasonic transducer; 6: Diverging nozzle; 7: Flow meter; 8: Air valve; 9: Multi-stage air outlet; 9a: Main cavity; 9b: Air outlet pipe; 10: Waterproof shell; 11: Ultrasonic transducer; 12: Liquid level probe; 13: Sound insulation cotton; 14: Buzzer; 15: Water inlet; 16: Water inlet valve; 17: Water tank; 18: Water outlet valve; 19: Water outlet; 20: Air outlet pipe; 21: Resistance wire; 22: Drying tube; 23: Converging nozzle; 24: Activated carbon; 25: Diverging nozzle; 26: Ultraviolet lamp. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following embodiments, in conjunction with the accompanying drawings, will specifically illustrate the technical solution of this invention.

[0029] <Example>

[0030] See Figure 1This invention provides an air purification device, comprising: a first-stage purification unit, a second-stage purification unit, and a third-stage purification unit. The first-stage purification unit consists of a fan 1, an air inlet pipe 2, an ash discharge port 3, a first ultrasonic generator 41, an ultrasonic transducer 5, a diffusing nozzle 6, a flow meter 7, and an air valve 8. The second-stage purification unit consists of a multi-stage air outlet 9, a waterproof housing 10, a second ultrasonic generator 42, an ultrasonic transducer 11, a liquid level probe 12, sound insulation cotton 13, a buzzer 14, a water inlet 15, a water inlet valve 16, a water tank 17, a water outlet valve 18, and a water outlet 19. The third-stage purification unit consists of an air outlet pipe 20, a drying pipe 22, a converging nozzle 23, activated carbon 24, a diffusing nozzle 25, and an ultraviolet lamp 26.

[0031] The first-stage purification unit uses ultrasound to agglomerate airborne particles.

[0032] Fan 1 is connected to the inlet of air intake duct 2 and is used to send heavily polluted air (mainly suspended particles) into air intake duct 2.

[0033] The air intake duct 2 has a vertically arranged rising airflow section, a horizontally arranged straight airflow section, and a vertically arranged descending airflow section. The bottom of the rising airflow section is connected to a dust collection port 3, which can be disassembled and cleaned at any time. Additionally, a straight inlet section is provided between the rising airflow section and the fan 1. This straight inlet section acts as a buffer, preventing the airflow from the fan 1 from affecting the agglomeration and sedimentation of suspended particles within the rising airflow section.

[0034] The first ultrasonic generator 41 is electrically connected to the ultrasonic transducer 5, which is mounted on the wall of the rising airflow section. The ultrasonic transducers 5 comprise several groups arranged from top to bottom in the rising airflow section of the intake duct 2, each group consisting of two ultrasonic transducers 5 respectively located on the left and right sides of the pipe wall. In this embodiment, three groups of ultrasonic transducers 5 are installed, for a total of six ultrasonic transducers 5. After the three first ultrasonic generators 41 begin operation, the six ultrasonic transducers 5 emit ultrasonic waves into the air of the vertical rising airflow section, forming a standing wave field that agglomerates fine particulate matter in the air. When these agglomerates into larger particles, the larger particles settle to the ash discharge port 3 under the influence of gravity.

[0035] The frequency of the sound wave emitted by the first ultrasonic generator 41 is set to 20KHz. This sound wave has a good agglomeration effect on fine particles. Experiments have verified that as the sound wave action time increases, the particle agglomeration efficiency will increase. Furthermore, the larger the particle size corresponding to the initial peak particle concentration, the higher the sound wave agglomeration efficiency. The highest efficiency can reach 82.4%. The higher the initial particle number concentration, the higher the sound wave agglomeration efficiency.

[0036] A converging nozzle 6, a flow meter 7, and an air valve 8 are sequentially installed on the straight airflow section of the air intake duct 2. The converging nozzle 6 is used to change the gas flow rate. The flow meter 7 is used to monitor the gas flow rate in the duct. The air valve 8 is used to control whether air in the air intake duct 2 can enter the water tank.

[0037] The end of the descending airflow section of the air inlet pipe 2 extends below the liquid surface of the water tank 17, and the multi-stage air outlet 9 is installed at the end of the descending airflow section. Figure 3 This is a three-dimensional structural schematic diagram of the multi-stage air outlet 9 in an embodiment of the present invention. (See attached diagram.) Figure 3 The multi-stage air outlet 9 includes a main cavity 9a connected to the descending airflow section of the air inlet pipe 2. The main cavity 9a is rectangular in shape, and several air outlet pipes 9b are arranged around its perimeter. In this embodiment, each face of the main cavity 9a has three air outlet pipes 9b arranged from top to bottom, for a total of 12 air outlet pipes 9b. The length of these air outlet pipes 9b decreases sequentially from top to bottom. Air flows from the descending airflow section to the multi-stage air outlet 9. The uppermost air outlet pipe allows air to reach a greater distance from the water tank 17, the bottommost air outlet pipe allows air to be released in the middle of the water tank, and the middle air outlet pipe allows air to be released between the two. The air is then released to the perimeter of the water tank through the multi-stage air outlet 9, allowing the air to be relatively evenly distributed throughout the water tank.

[0038] The second-stage purification unit uses ultrasonic waves to generate bubbles and water droplets to adsorb particulate matter in the air.

[0039] The end of the downward airflow section of the air inlet pipe 2 of the water tank 17 is located 1 / 6 to 1 / 4 of the distance from the bottom of the water tank 17. The water tank 17 is cuboid and has an inlet 15 and an outlet 19 for water intake. An inlet valve 16 is provided on the inlet 15 to add water to the water tank. An outlet valve 18 is provided on the outlet 19 to discharge water from the water tank.

[0040] The second ultrasonic generator 42 is electrically connected to the ultrasonic transducer 11. There are several ultrasonic transducers 11 arranged in a rectangular pattern on the top of the water tank 17. Figure 4 This is a schematic diagram showing the arrangement of multiple ultrasonic transducers 11 on the water tank 17 in an embodiment of the present invention. (See attached diagram.) Figure 4 In this embodiment, the air inlet pipe 2 and the air outlet pipe 20 are located at the center of the water tank, and the number of ultrasonic transducers 11 is 10. Figure 4 The rectangular arrangement shown is configured such that the end of the ultrasonic transducer 11 is located one-third of the way from the bottom of the water tank.

[0041] In this embodiment, each ultrasonic transducer 11 has a power of 200W, and the 10 ultrasonic transducers 11 are controlled by two 1000W constant power second ultrasonic generators 42.

[0042] The waterproof housing 10 is placed on top of the water tank to protect the piezoelectric ceramic in the ultrasonic transducer from moisture, enabling it to work stably for a long time.

[0043] The water tank 17 has a sandwich structure, with sound-insulating cotton 13 filling the sandwich. The sound-insulating cotton 13 is used to absorb the sound generated when ultrasonic waves propagate in the liquid. Due to the violent vibration of liquid particles, small cavities are generated inside the liquid. These small cavities expand and close rapidly, causing violent collisions between liquid particles, thus reducing cavitation noise.

[0044] The liquid level probe 12 is used to monitor whether the liquid level in the water tank 17 exceeds the rated liquid level height. The liquid level probe 12 is fixedly connected to the bottom of the air inlet pipe 2 and is located at 1 / 3 of the distance from the top of the water tank 17.

[0045] The buzzer 14 is located on the outside of the water tank. The buzzer 14 is linked with the liquid level probe 12. When the liquid level probe 12 detects that the liquid level in the water tank 17 exceeds the rated liquid level height, an alarm is sounded.

[0046] The third-stage purification unit is used for activated carbon adsorption and ultraviolet photolysis of harmful gas molecules.

[0047] The inlet section of the air outlet pipe 20 is located at a distance of 1 / 12 to 1 / 8 from the top of the water tank 17, above the rated liquid level.

[0048] The exhaust duct 20 is sequentially equipped with a drying tube 22, a converging nozzle 23, activated carbon 24, a diverging nozzle 25, and an ultraviolet lamp 26. The drying tube 22 contains a resistance wire 21; the air after the second stage of treatment is heated by the resistance wire to remove moisture. The converging nozzle 23 utilizes the gas pressure drop to accelerate the airflow, allowing the air to pass through the activated carbon section with a slightly smaller cross-sectional area, maximizing the adsorption of harmful substances by the activated carbon 24. The diverging nozzle 25 reduces the airflow velocity, allowing the air to slowly enter the section of the ultraviolet lamp 26, enabling the ultraviolet lamp to fully photodegrade harmful substances. These harmful substances include formaldehyde, benzene, and other harmful gas molecules.

[0049] This invention also provides an air purification method, which is a multi-stage purification method implemented using an air purification device. The air purification method includes the following steps:

[0050] 1) Preparation:

[0051] Add or drain water into water tank 17 until the liquid level reaches the rated height. The specific operation is as follows:

[0052] Open the inlet valve 16 and add water to the water tank 17 through the inlet 15. When the water reaches the rated level, the level probe 12 sends a signal, and the buzzer 14 sounds an alarm based on the signal from the level probe 12. At this time, open the outlet valve to slowly release the water until the buzzer 14 stops sounding, and then close the inlet valve 16 and the outlet valve 18.

[0053] 2) First-level purification:

[0054] The fan 1 is turned on to allow outside air to enter the intake duct 2, and the air valve 8 is closed to disconnect the first and second purification units. Then, the first ultrasonic generator 41 is turned on, causing fine particles in the air within the intake duct 2 to agglomerate into larger particles under the influence of the standing wave sound field generated by the ultrasonic transducer 5, and settle to the ash discharge port 3 under gravity. Afterward, air enters the diverting nozzle 6 until the flow meter 7 reaches its rated value. The volumetric airflow rate entering the water tank is controlled to be 1 / 8 to 1 / 6 of the water volume in the tank.

[0055] In this embodiment, the first ultrasonic generator uses a rated frequency of 20kHz, and the fan operates intermittently for 1.5 seconds every 18 seconds to facilitate the settling of particulate matter. This system is configured with optimal ultrasonic treatment conditions to achieve the best purification effect and improve air purification efficiency.

[0056] During the first stage of purification, the higher the PM2.5 value in the air, the higher its aggregation efficiency and the better the effect, enabling it to purify moderately and heavily polluted air to the greatest extent.

[0057] 3) Second-level purification:

[0058] After the flow meter 7 reaches its rated value, the air valve 8 is opened to connect the first and second purification units, and air enters the water tank 17 below the water surface through the multi-stage air outlet 9. Then, the second ultrasonic generator 42 is turned on, and the ultrasonic transducer 11 emits ultrasonic waves to generate microbubbles and microdroplets in the water to adsorb particulate matter.

[0059] During the second-stage purification process, when the 10 ultrasonic transducers emit ultrasonic waves in the water, tens of thousands of tiny bubbles are generated due to the vibration of the liquid, producing a pressure of several thousand to tens of thousands of atmospheres. This intense interaction between the particles causes the temperature of the liquid to rise sharply, which plays a good role in stirring, thereby mixing the water and the particles and accelerating the mixing reaction. As a result, the particles are more effectively aggregated under the combined action of ultrasonic radiation force and acoustic drag force.

[0060] 4) Third-level purification:

[0061] Air enters the drying tube 22 for drying, then passes through the converging nozzle 23 to increase the airflow speed, and then enters the activated carbon 24 to adsorb harmful gas molecules. After passing through the expanding nozzle 25 to reduce the airflow speed, the harmful gas molecules are photodecomposed by the ultraviolet lamp 26, and finally clean air is discharged.

[0062] The air purification device and air purification method in the embodiments of the present invention adopt a multi-stage purification method to purify the air. Compared with other treatment methods, ultrasonic treatment is less likely to generate secondary pollution and has a higher resource utilization rate, which has broad application prospects and can be applied in the following scenarios: (1) The air purification device is placed outdoors, and the final exhaust pipe of the device is connected to the inlet of the fresh air system of the office and business places. In this way, fresh air can be obtained through the device of the present invention and then sent into these places through the fresh air system. (2) Using the air purification device outdoors can improve the air in the local area and improve the working environment for outdoor workers in harsh weather conditions. (3) The air purification device can be used for the treatment of polluted gas sources. For example, it can be applied in many industrial production industries. The air purification device of the present invention can be connected after the tail gas basic treatment device of the industry. In this way, after the industrial gas is treated by removing large particulate matter and basic harmful substances in the tail gas basic treatment device, the device of the present invention can further effectively purify the smaller PM2.5 particles in the gas, and at the same time, it can adsorb and photolyze some residual harmful gas molecules.

[0063] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. An air purification device, characterized in that, include: The first-stage purification unit is equipped with an air intake pipe. Outside air is introduced into the air intake pipe and ultrasonic waves are used to agglomerate the particulate matter in the air. The second-stage purification unit is equipped with a water tank connected to the air intake pipe. The air that has been treated by the first-stage purification unit is introduced into the water, and ultrasonic waves are used to generate bubbles and water droplets to adsorb particulate matter in the air. The third-stage purification unit is equipped with an air outlet pipe connected to the water tank, which removes harmful gas molecules from the air through activated carbon adsorption and ultraviolet photolysis. The first-stage purification unit includes: a fan, a first ultrasonic generator, an ultrasonic transducer, and a multi-stage air outlet; the air inlet duct has a vertically arranged rising airflow section, a horizontally arranged straight airflow section, and a vertically arranged descending airflow section; the first ultrasonic generator is electrically connected to the ultrasonic transducer, and the ultrasonic transducer is mounted on the wall of the rising airflow section; the ultrasonic transducer includes several groups arranged from top to bottom in the rising airflow section of the air inlet duct, each group consisting of two ultrasonic transducers respectively arranged on the left and right sides of the pipe wall; the straight airflow section is sequentially equipped with a converging nozzle, a flow meter, and a... Air valve; the end of the descending airflow pipe section extends below the liquid surface of the water tank, the multi-stage air outlet is installed at the end of the descending airflow pipe section, the multi-stage air outlet includes a main cavity connected to the descending airflow pipe section of the air inlet pipe, the main cavity is rectangular in shape, each side of the main cavity is provided with three air outlet pipes from top to bottom, a total of 12 air outlet pipes, the length of these air outlet pipes decreases from top to bottom, air flows from the descending airflow pipe section to the multi-stage air outlet, the uppermost air outlet pipe allows air to reach a farther distance in the water tank, the bottommost air outlet pipe allows air to be released in the middle of the water tank, and the middle air outlet pipe allows air to be released between the two; The second-stage purification unit includes: a second ultrasonic generator, an ultrasonic transducer, a liquid level probe, and a buzzer; the second ultrasonic generator is electrically connected to the ultrasonic transducer, and there are several ultrasonic transducers arranged in a rectangular pattern on the top of the water tank; the liquid level probe is used to monitor whether the liquid level in the water tank exceeds the rated liquid level height; the buzzer is linked to the liquid level probe, and issues an alarm when the liquid level probe detects that the liquid level in the water tank exceeds the rated liquid level height. The third-stage purification unit includes a drying pipe, a converging nozzle, activated carbon, a diffusing nozzle, and an ultraviolet lamp, which are sequentially arranged on the air outlet pipe.

2. The air purification device as described in claim 1, characterized in that: The bottom of the rising airflow pipe section is connected to an ash discharge port.

3. The air purification device as described in claim 1, characterized in that: in, The water tank is a cuboid with a sandwich structure, and the sandwich is filled with sound insulation cotton.

4. An air purification method, implemented using the air purification device as described in any one of claims 1 to 3, characterized in that, Includes the following steps: 1) Preparation: Add or drain water into the tank to bring the liquid level to the rated height: Open the inlet valve and add water into the tank through the inlet. When the water reaches the rated height, the level probe sends a signal, and the buzzer sounds an alarm based on the signal from the level probe. At this time, open the outlet valve and slowly release the water until the buzzer stops sounding. Then close the inlet and outlet valves. 2) First-level purification: Turn on the fan to allow outside air to enter the air intake pipe, and close the air valve to prevent the first purification unit from communicating with the second purification unit; Then, the first ultrasonic generator is turned on, causing the fine particles in the air in the intake pipe to agglomerate into large particles under the action of the standing wave sound field formed by the ultrasonic transducer, and then settle to the ash discharge port under the action of gravity. After that, air enters the dilator nozzle until the flow meter reaches its rated value; 3) Second-level purification: After the flow meter reaches the rated value, the air valve is opened to connect the first purification unit and the second purification unit, and the air enters the water tank below the water surface through the multi-stage air outlet. Then, the second ultrasonic generator is turned on, and the ultrasonic transducer emits ultrasonic waves to generate microbubbles and microdroplets in the water to adsorb particulate matter. 4) Third-level purification: Air enters the drying tube sequentially for drying, then passes through a converging nozzle to increase the airflow speed before entering activated carbon to adsorb harmful gas molecules. After passing through a expanding nozzle to reduce the airflow speed, it passes through an ultraviolet lamp to decompose the harmful gas molecules through light, and finally, clean air is discharged.

5. The air purification method as described in claim 4, characterized in that: in, The air volume flow rate entering the water tank is 1 / 8 to 1 / 6 of the water volume in the tank.

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