2051 results about "Air purification" patented technology

The invention discloses a local space oxygen enrichment control system and method based on an oxygen selective permeable membrane, belongs to the technical field of air purification, environment control and membrane separation, and aims to solve the problems that the indoor oxygen concentration cannot be actively and efficiently increased and compact integration is difficult in the prior art. The system integrates an outdoor fresh air fan, a switching valve, an oxygen enrichment membrane device, an air pump, an indoor air return and supply fan, a gas monitoring control unit, an outdoor exhaust fan and the like, and a control unit dynamically regulates and controls a switching valve passage, the rotating speed of each fan and start and stop of the air pump according to the difference between oxygen sensor data and preset target oxygen concentration; air selectively passes through the oxygen-enriched membrane device to generate oxygen-enriched air or is fed into a room through a bypass air path, and the indoor oxygen concentration is actively stabilized at 21%-26%. The system is suitable for local spaces such as residences and offices, active oxygen enrichment and environment control can be achieved, the air quality is improved, and meanwhile low energy consumption, safety and comfort are taken into account.

The invention relates to the technical field of air purification, and discloses a negative oxygen ion generator and a method thereof.The negative oxygen ion generator comprises an external shell used for providing installation positions for related parts; the power supply input module is mounted in the external shell, is internally provided with a filtering unit, and is used for receiving external direct current; the direct current and alternating current inversion module is electrically connected with the output end of the power supply input module, is internally provided with a switch assembly and is used for converting the direct current into high-frequency alternating current; a primary winding, a secondary winding and a feedback winding are arranged in the boosting transformer. A boosting transformer is arranged between a direct current and alternating current inversion module and a high-voltage double-voltage rectification module, so that the voltage is effectively boosted, more importantly, the magnetic field coupling characteristics of a primary winding and a secondary winding are utilized, reliable electrical isolation is constructed, and a physical path from a high-voltage side circuit to a low-voltage side circuit is blocked.

The invention relates to the field of smart home, and particularly provides an air purification device, method and equipment, a storage medium and a product. The device comprises a position detection module, an animal attraction module and an air purification module; the position detection module is used for detecting the real-time position of the target animal; the animal attraction module is used for sending attraction information interested by a target animal, and the attraction information comprises at least one of sound information, light information and smell information; and the air purification module is used for purifying surrounding air according to the real-time position and the attraction information. By means of the device, the effect of improving the efficiency of the air purification process can be achieved.

The invention relates to the technical field of air purification, in particular to a negative oxygen ion dynamic air purification strategy and system.The negative oxygen ion dynamic air purification strategy comprises the following steps that on the basis of linkage of particulate matter concentration and multiple environmental parameters, influences of airflow, pressure, temperature and humidity and personnel flow on particulate matter distribution are analyzed, and formaldehyde and harmful gas parameter fluctuation trends are combined; pollution changes and equipment response grades are judged, the release path, frequency and power of the negative oxygen ion generator are adjusted, and ion release adjustment parameters are output. Data such as multi-element particulate matter concentration, airflow state, environmental pressure, temperature and humidity, personnel flow and the like cooperatively participate in monitoring and judgment, particulate matter grading characteristics are linked in real time through environmental dynamic factors, fluctuation trends of multiple pollutants in air are jointly calculated, high-risk change stages are actively recognized, purification response grades are dynamically output, and the purification effect is improved. The ion release direction and power are adjusted in an automatic linkage mode, the purification response changes along with space pollution hot spots, and diversified pollution distribution scenes are effectively covered.

The invention discloses a liquid air energy storage system based on air separation, which is characterized by comprising an air purification unit, an energy storage unit, an air rectification unit and an LNG (Liquefied Natural Gas) cold supply unit, wherein the air purification unit comprises an air filter, an air compressor, a first cooler, an adsorber and a first heater, and the energy storage unit comprises a first liquid separation tank, a liquid air storage tank, a liquid air pump and an air expansion machine. The air rectification unit comprises a rectification tower, a main cold box, a second liquid separation tank, a second subcooler, a first heat exchanger, a liquid nitrogen storage tank, a liquid oxygen storage tank, a second heat exchanger, an argon rectification system and a liquid argon storage tank; and the LNG cold supply unit comprises a first nitrogen supercharger, a second nitrogen supercharger, an LNG cold box and a first subcooler. The system has the functions of air separation and electric energy storage at the same time, and cold energy of the LNG receiving station is fully utilized for air separation and energy storage to participate in construction of a novel power system of a power grid.

The invention relates to the technical field of environment control, in particular to a cold and heat source environment control method and device with an air purification function, and the method comprises the steps: collecting various parameters through a sensor network, and carrying out the data fusion based on a decision rule base to select a dominant working mode; corresponding air treatment operation is executed, and a composite energy-saving strategy including precooling optimization and phase change latent heat assistance is triggered under the refrigeration working condition; fuzzy control and machine learning are applied to optimize system output and predict load, and a decision rule base and algorithm parameters are updated through self-learning; air supply and exhaust power is controlled to maintain the negative pressure gradient of the key area, and an air path distribution mechanism is adjusted to organize a one-way air flow line; the device comprises an intelligent control module, a sensor group, a fresh air module, a purification module, a cold and heat source module, a bypass pipeline and an air path distribution mechanism. The problems that an existing system is poor in function collaboration, low in energy efficiency and unreasonable in airflow organization are solved, and intelligent decision making, deep energy saving and accurate environment control are achieved.

The invention provides a waste gas treatment device for ion exchange resin production, and belongs to the technical field of air purification, the waste gas treatment device comprises a purification box, two connecting pipes are symmetrically arranged on the outer surface of the purification box, an activated carbon bag taking-out assembly is embedded in the purification box, and the activated carbon bag taking-out assembly comprises an insertion hole formed in the center of one surface of the purification box; four restraining openings are symmetrically reserved in the inner surface of the inserting hole, an outer fixing cylinder is embedded in the inserting hole, restraining strips are arranged at the positions, close to the inner sides of the restraining openings, of the outer surface of the outer fixing cylinder, and the restraining openings are matched with the restraining strips; through mutual cooperation of the activated carbon bag taking-out assembly and the magnetic disc, the activated carbon bag can be taken out in a sealed state, tail gas in the activated carbon bag is prevented from overflowing, the purification box is sealed after the activated carbon bag is taken out, unpurified tail gas in the purification box is prevented from overflowing, and the breathing safety of workers is guaranteed.

The invention relates to the technical field of air purification, in particular to an air purification method and system based on an ion air supply technology. The method comprises the following steps of obtaining target area data and reconstructing a spatial model, performing block division, determining virtual layout nodes and performing layout rehearsal, obtaining a unit layout topological structure through spatial node dynamic clustering and redundancy elimination, performing ion air supply action range superposition simulation, analyzing action range collaborative enabling parameters, and performing layout rehearsal on the basis of the action range collaborative enabling parameters. Ion transmission is monitored in real time, diffusion path tracking and blind area correction are carried out, heterogeneous response unit dynamic coupling and purification intensity boundary migration are achieved, adjustment simulation is carried out based on adjustment of purification intensity, feedback data are collected, coordination control is carried out through an air purification threshold value, and intelligent air purification is achieved. According to the invention, the air purification process is accurately controlled and optimized, the purification efficiency is improved, the energy consumption is reduced, and a technical guarantee is provided for efficient and intelligent air purification.

The invention discloses a vehicle-mounted oxygen production and air purification control method and system based on multi-sensor cooperation, and relates to the technical field of vehicle-mounted environment control, the oxygen concentration, PM2.5 concentration and AQS grade inside and outside a vehicle are detected in real time, and a vehicle state signal is obtained; judging whether an oxygen generator is started or not according to comparison between the in-vehicle oxygen concentration and the minimum oxygen concentration threshold value; if the oxygen generator is started, the oxygen generator circulation mode and the air purifier operation mode are switched according to the PM2.5 concentration inside and outside the vehicle and the AQS grade, and in the oxygen generation and air purification process under the mode operation, the oxygen generation flow and the air purification power are subjected to coupling regulation and control according to the PM2.5 concentration and the oxygen concentration inside the vehicle; meanwhile, safety protection regulation and control are carried out in combination with vehicle state signals; otherwise, detection and judgment at the next moment are carried out. The system energy efficiency can be improved, the oxygen concentration fluctuation is reduced, the safety performance is improved, and the user experience is improved.

The invention belongs to the technical field of air purification devices, and particularly relates to an energy storage electric field purification device which comprises a shell, the outer surface of the shell is communicated with an air outlet nozzle, and the surface of one side of the shell is fixedly connected with a filter screen. In the embodiment, the motor transmits kinetic energy to the fried dough twist stick through the driving wheel, the driven wheel, the first belt, the supporting column, the transmission gear, the driven gear, the connecting plate, the second belt and the force guiding wheel, the fried dough twist stick rotates after being stressed, a groove in the outer surface is matched with a guiding block, so that a connecting rod drives a sliding block to reciprocate on the outer surface of a sliding rail, and the sliding block drives a fixing plate to move; dust adsorbed on the outer surface of the dust collecting plate is pushed by the cleaning brush to enter the dust collecting bag through the two feeding frames and the two connecting frames, the dust is prevented from being accumulated on the outer surface of the dust collecting plate, the outer surface of the dust collecting plate is automatically cleaned, manual operation is not needed, and the use experience is improved.

The invention provides air purification equipment applied to wafer detection and a wafer detection system.The air purification equipment comprises a rack and an air supply part, an outer protection cavity, a light path cavity and a detection cavity are formed in the rack, the light path cavity and the detection cavity are formed in the outer protection cavity, and the air supply part communicates with the outer protection cavity, the light path cavity and the detection cavity; the air pressure in the detection cavity is greater than the air pressure in the light path cavity, and the air pressure in the light path cavity is greater than the air pressure in the outer protection cavity. The light path cavity and the detection cavity are arranged in the outer protection cavity, and a gradient air pressure system in which the air pressure of the detection cavity is higher than that of the light path cavity and the air pressure of the light path cavity is higher than that of the outer protection cavity is constructed, so that multiple protection barriers are formed, external pollutants are effectively prevented from invading a core working area, and the cleanliness control effect is improved; and the requirement of nanoscale wafer detection on the environment is met.

The invention discloses a purification capacity evaluation method of air purification equipment and related equipment, and the method comprises the steps: in the operation process of the air purification equipment, when it is detected that the indoor pollutant concentration has a preset change characteristic, sequentially obtaining pollutant concentration attenuation sequences of the equipment under different purification intensities in the same time window; determining a background baseline according to the pollutant concentration data outside the time window, performing background stripping processing on each pollutant concentration attenuation sequence, and screening attenuation sequence pairs meeting comparability requirements based on a preset criterion; performing quantification processing on the screened attenuation sequence pair, and calculating an attenuation difference value under different purification intensities to obtain a purification capability characterization value; the purification capacity characterization values are obtained through multiple times of repetition, a set is formed, and the purification capacity evaluation result of the air purification equipment is determined based on statistical analysis. According to the scheme, the real purification capacity of the air purification equipment can be objectively reflected in a non-ideal and dynamic environment, and the stability and comparability of a result are ensured.

The present application relates to the field of vehicle power technology, and particularly relates to a hydrogen fuel cell with air purification and circulation functions, a self-cleaning air guide assembly is arranged at the air inlet of the fuel cell, the preliminarily filtered air in the vehicle is introduced into the fuel cell by the air guide fan, the air is secondarily filtered by the filter membrane during the air inlet process, the filter membrane can be retracted and extended by the first retraction and extension piece and the second retraction and extension piece installed in the air inlet window, at the same time, the air inlet cover guides the unreacted residual air back to the installation chamber through the air guide pipe, the outside of the filter membrane is back-flushed, the attached impurities are discharged through the blow-off port, the filtering efficiency of the filter membrane is effectively maintained, in addition, the inner side knocking assembly is arranged in the installation chamber, when the first retraction and extension piece and the second retraction and extension piece rotate, the knocking plate can knock the inner side of the filter membrane, the attached impurities are promoted to fall off, so that the self-cleaning effect is further improved, the dust holding capacity and the self-cleaning performance of the filtering assembly are significantly improved, and the maintenance frequency and the replacement requirement are reduced.

The invention relates to the technical field of vehicle control, and discloses a vehicle oxygen generation control method and device, a vehicle and a computer readable storage medium. The method comprises the steps that in the vehicle running process, vehicle working condition information, the concentration of particulate matter in air and altitude information are obtained; according to the concentration of the particulate matter in the air, an air purification strategy is determined, and a protection purification module in an oxygen generation system of the vehicle is controlled to purify the air based on the air purification strategy; and according to the vehicle working condition information and the altitude information, an oxygen generation module in the oxygen generation system is controlled to treat purified air so as to generate oxygen. The oxygen generation system of the vehicle is controlled to generate oxygen according to the working condition information of the vehicle, the concentration of the particulate matter in the air and the altitude information, so that the oxygen generation control is more adaptive to the current vehicle state and environment condition, and the oxygen generation reliability and stability are further improved.

The invention discloses a dust removal and air purification device for container plywood processing, and relates to the technical field of plywood processing. The dust removal and air purification device for container plywood processing comprises a bottom bin, an input pipeline is assembled on the side face of the bottom bin, and a dust discharge pipeline is assembled at the bottom of the bottom bin; the top bin is assembled on the bottom bin through threads, and a filter plate is assembled at the bottom of the top bin through bolts; a power rod is assembled in the top bin, and a cleaning brush is assembled on the side face of the power rod. According to the dust removal and air purification device for container plywood processing, when the bottom of a filter plate is full of dust due to long-term use, a power rod is started and rapidly rotates, a cleaning brush and a rotating bin are driven to rapidly rotate together, and a first hydraulic bin, a first arc-shaped rod, a second arc-shaped rod, a first spring, a second hydraulic bin, a first stress rod, a second spring, a third hydraulic bin, a first hose and an extrusion plate are matched; an extra force is applied to the cleaning brush during cleaning, so that the dust removal and air purification efficiency of the device is improved.

The utility model discloses a clean workshop air purification device which comprises a purifier body, a disinfection mechanism is arranged at the front end in the purifier body, the disinfection mechanism comprises a liquid storage tank fixedly connected to the front side of the lower end in the purifier body, and connecting pipes are connected to the two ends of the liquid storage tank in an inserted mode. A plurality of evenly-distributed atomizing nozzles are inserted into the sides, close to each other, of the connecting pipes, the upper ends and the lower ends of the connecting pipes are sleeved with buckles, the buckles are fixedly connected to the inner side wall of the purifier body, and the filtering mechanism is arranged in the middle of the interior of the purifier body. Compared with the prior art, the air purifier has the advantages that the quality of air blown out from the interior of the purifier body is higher, the elastic plates on the two sides are pressed towards the middle, the sliding frame is pulled out from the side face, operation of workers is facilitated, and the primary-efficiency filter screen, the medium-efficiency filter screen and the high-efficiency filter screen on the sliding frame can be replaced conveniently.

1. Name of this design: Main body of the water tank for an air purifier with humidifier. 2. Purpose of this design: The purpose of this design, both in whole and in part, is to contain water in an air purifier with a humidifier. 3. The key design features of this product are the shape of the water tank body of the air purifier with humidifier. 4. The image or photograph that best illustrates the design's key points: 3D rendering 1. 5. Other situations requiring explanation: This design is a partial protection design, where the solid line portion is the content to be protected, and the dashed line portion is not the content to be protected.

1. The name of the design product: humidification purifier (25G). 2. The use of the design product: for humidification and air purification. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention discloses a laminar flow system for purifying air in an elevator car, belongs to the technical field of elevator ventilation systems, and solves the problem that an existing elevator is poor in ventilation effect. The system specifically comprises an air supply system and an exhaust system, wherein the air supply system is arranged at the top of a car; the exhaust system is arranged at the bottom of the lift car; the air supply system comprises a mounting box; the mounting box is mounted at the top of the lift car; a plurality of air inlets are formed in the side wall of the mounting box; and an air supply assembly and a filtering assembly are sequentially mounted in the mounting box from top to bottom. According to the elevator, the air supply system is used for supplying external air into the elevator car from the top of the elevator car, and the air flows through the whole elevator car after entering the elevator car and then is exhausted through the exhaust system at the bottom of the elevator car; through the design, air circulation in the lift car is accelerated, and the ventilation effect is good; the filtering assembly is designed in the air supply system to filter air entering the lift car, the air in the lift car is kept clean, and cross infection is avoided.

An energy-independent water-based pure air cleaning system using a water electrolytic-fuel cell is disclosed. The energy-independent water-based pure air cleaning system using a water electrolytic-fuel cell proposed by the present invention comprises: a water electrolysis unit that generates hydrogen and oxygen through a water electrolysis treatment using supplied water, and supplies hydrogen gas to an energy generating unit by adjusting the pressure of the generated hydrogen gas; the energy generating unit that generates electrical energy on the basis of the hydrogen gas supplied for use as a power source for air purification; an energy storage unit that does not need energy charging and supplies the generated electrical energy as power for air purification; an oxygen exhaust port for discharging the oxygen generated in the water electrolysis unit for air purification; and a humidifier that generates water vapor by spraying or evaporating the supplied water by any one of ultrasonic vibration, heating, natural evaporation, or nozzles to control the humidity in a room.

The invention discloses a mesoporous biological ceramic filter sponge as well as a preparation method and application thereof, and belongs to the technical field of water treatment and air purification. The filtering sponge adopts a three-layer composite structure and comprises a three-dimensional porous sponge framework, a mesoporous ceramic transition layer and a nano metal thorn functional layer. Microorganism inactivation is achieved through a unique'adsorption-locking-puncturing 'physical mechanism, the inactivation rate of bacteria and viruses exceeds 99.9% under the condition that no chemical agent is used, meanwhile, heavy metal pollutants can be selectively removed, and beneficial mineral substances are reserved. The filtering sponge has the advantages of high porosity, large specific surface area, long service life and the like, and can be widely applied to the fields of drinking water treatment, sewage treatment, air purification and the like.

The invention relates to the technical field of air purification equipment, in particular to an unpowered public place air directional flow purification structure. The problems that in the prior art, the natural ventilation principle and the multi-stage purification function cannot be fused on the structural design level, and consequently inherent defects exist in the aspects of energy consumption, noise, maintenance cost, airflow organization stability and the like are solved. The unpowered public place air directional flow purification structure is arranged on a wall unit and comprises a micropore physical pre-filtering structure, a multi-layer labyrinth type physical filtering structure and an adsorption / deposition structure which are integrally arranged in a closed mounting cavity in the wall unit. In the operation process of the structure, no fan or motor or external power supply is needed in the whole process, air circulation is driven by completely depending on the thermal characteristics of the wall and weak thermal buoyancy formed by an indoor environment heat source, no mechanical moving part exists in the operation process, the noise level is low, and the noiseless requirement of a hospital ward area at night is met.

The invention provides an air purification equipment cluster control method and system combined with the Internet of Things, and relates to the technical field of Internet of Things control, and the method comprises the steps: firstly building an equipment environment dynamic association network according to the overlapping degree of an equipment unit operation coverage range and a sensing unit monitoring range; acquiring regional environment data in real time and generating an equipment environment adaptation demand sequence; inputting the data into a pre-trained cluster control model, and generating an equipment cluster dynamic control instruction set through internal three-party process interaction; the distribution equipment cluster dynamically controls the instruction set to drive the equipment unit to adjust operation parameters and collect a feedback data set; and returning the feedback data set to the cluster control model, and adjusting association rules, scheduling logic and an adaptation strategy to generate a cluster control flow optimization scheme for generating a next instruction set, thereby realizing intelligent and efficient control of the air purification equipment cluster.

A first air inlet and a first air outlet are formed in a shell, an indoor heat exchanger is arranged in the shell, the indoor heat exchanger is configured to conduct heat exchange on flowing air, a negative oxygen water ion generating device is arranged on the shell and comprises a rotating part and an emitting electrode, a second air channel is formed in the rotating part, and the emitting electrode is arranged in the rotating part. The rotating part is provided with a second air outlet communicated with the second air duct, the second air outlet is arranged beside the first air outlet, the emission electrode is arranged in the second air duct, the emission electrode is configured to release ions to the indoor space, and the emission electrode is configured to rotate along with the rotating part so as to adjust the ion conveying direction. The indoor unit can achieve independent control over air conditioner air and ion air, and the air purification effect and the human body health care effect are improved.

According to the wall-mounted air purifier with the intelligent advertisement projection screen, the air purification function and the intelligent advertisement projection screen function are combined, two kinds of equipment do not need to be installed and purchased respectively, the installation space is saved, the purchase and maintenance cost is reduced, and efficient management is facilitated; the panel display is matched with the U-shaped ring seat in the rectangular containing groove through the left rotating shaft and the right rotating shaft and can be turned out around any rotating shaft under driving of the driving mechanism, a user can flexibly adjust the display angle, it is ensured that advertisements are clearly watched or information is obtained at different positions and viewing angles, and the advertisement spreading effect and the information obtaining efficiency are improved. The equipment is diversified in function, expands application scenes, is suitable for households, offices, shopping malls, hotels and other commercial places, and is combined with an adjustable angle and a detachable structure, so that the practicability and the user experience are improved, the market competitiveness is enhanced, and product popularization is facilitated.

The invention relates to the technical field of cleaning devices, and discloses a waste gas dedusting and cleaning device for atmospheric environmental pollution control, which comprises a box body, a base is mounted at the bottom of the box body, a sleeve is fixedly connected to the inner wall of the box body, a partition plate is further fixedly connected to the inner wall of the box body, and a driving motor is mounted at the top of the partition plate. The filter element barrel continuously and slowly rotates, so that the surface area of the whole filter screen faces the air inlet direction with the highest polluted air concentration in turn, the consumption of filter materials is very uniform due to the rotating design, all the filter materials are fully utilized, and the air purification effect is improved. And the whole filter element barrel almost simultaneously reaches the end point of service life. The effective service life of the filter screen can be greatly prolonged, the air inlet efficiency can be optimized, the filter screen is utilized to the maximum extent, the purification effect is further improved, the swinging grating plate can actively guide the suction port to different directions, and purification dead corners are reduced.

The invention discloses an intelligent control method and system for air purification and environment monitoring of a radiotherapy machine room, and relates to the technical field of industrial control. The intelligent control method and system for air purification and environment monitoring of the radiotherapy machine room comprises the following steps: S1, collecting original environment data of a plurality of key positions in the radiotherapy machine room, and preprocessing the original environment data; s2, monitoring the state and interference characteristics of radiotherapy equipment, marking a high interference period in real time, and adding a label structure to original environment data; s3, performing stability and reliability evaluation on the original environment data; s4, performing prediction correction compensation on the low-credibility original environment data; and S5, wind pressure intensity control is started by integrating the interference intensity grade, the stable and reliable evaluation result and the prediction correction compensation result. The problem that the data quality is unstable due to the fact that the sensor is prone to jumping and failure in the strong electromagnetic and irradiation environment is solved.

A dust-free dust removal system of a mine drilling machine relates to the technical field of air purification and comprises a dry dust removal part and a wet dust removal part. The system integrates the advantages of a dry type dust removal technology and a wet type dust removal technology, the water flow is adjusted through air pressure, air pressure and hydraulic oil pressure, dust removal is more accurate, full-particle-size dust is covered, the system adapts to various working conditions, maximum health guarantee is achieved for staff, the service life of a drilling tool and a filter element can be greatly prolonged, and oil consumption is reduced.

The invention provides an air purification assembly and an air conditioning device. The shell body is cylindrical and is rotatably arranged in the air duct, and the opening part is arranged on the surface of a barrel body of the shell body; the inner shell extends in the axial direction of the outer shell, and the opening part is formed in the surface of a barrel of the inner shell; the ionizer fixing part is arranged on the inner surface of the inner shell; and the ionizer is fixedly arranged on the ionizer fixing part. In the operation process, the ionizer adsorbs dust particles in the air, and in the process that the outer shell is driven by wind power to pivot around the central axis of the cylinder, the surface of the carbon fiber brush is periodically wiped when the ionizer is transited to the inner surface of the outer shell from the opening part of the outer shell, so that the dust particles gathered on the surface of the ionizer are cleaned. According to the device provided by the embodiment of the invention, the zero-energy-consumption self-cleaning function of the ionizer can be ensured through wind power driving.

This application relates to an air handling device and an air purification device. The air handling device includes a first rotating assembly for connecting to a pre-filter assembly, thereby driving the pre-filter assembly to rotate. A cleaning mechanism is located around the pre-filter assembly. When the pre-filter assembly rotates, the cleaning mechanism acts on the surface of the pre-filter assembly to remove contaminants from its surface. The cleaning mechanism includes a scraper and a roller brush assembly, which are arranged adjacent to each other. Contaminants on the surface of the pre-filter assembly are scraped off by the scraper and carried away by the roller brush assembly. This air handling device not only removes contaminants from the surface of the pre-filter assembly but also carries them away, greatly reducing the possibility of secondary pollution caused by contaminants scraped from the surface of the pre-filter assembly and further improving the purification effect.