CN111686936B

CN111686936B - Air filter screen purifier

Info

Publication number: CN111686936B
Application number: CN201910193793.6A
Authority: CN
Inventors: 严东旭; 俞辉; 赵杨; 徐维跃
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2022-09-30
Anticipated expiration: 2039-03-14
Also published as: CN111686936A

Abstract

The invention discloses an air filter screen purification device, which comprises a filter screen collection device and an anion generation device, wherein the anion generation device is positioned at the upstream of a conductive filter screen device on a flow path of gas, and comprises an anion probe which can be connected with a negative high-voltage power supply and a first frame for arranging the anion probe, and the air filter screen purification device is characterized in that: the filter screen collection device includes the filter screen that connects positive high voltage power supply, ground connection when purifier is in the electret state when purifier is in the filter state, the filter screen is electrically conductive filter screen, negative ion generating device still includes the door electrode that connects positive high voltage power supply, does not connect the electricity when purifier is in the electret state when purifier is in the filter state, the connection can be dismantled in one side of first frame towards filter screen collection device to the door electrode.

Description

Air filter screen purifier

Technical Field

The invention relates to the field of air purification, in particular to an air filter screen purification device.

Background

In recent years, the problem of air pollution in China is increasingly prominent, people are more aware of the influence of air quality on human health and the necessity of air purification, so that at present, air purifier products in environment-friendly products are increasingly favored by people, and the market potential of the air purifier products is extremely large.

The commonly used air purifiers include an anion air purifier, an ozone air purifier, an ultraviolet air purifier, a photocatalytic air purifier and a plasma air purifier, and products of various types of purifier combinations combined together, and the like. The active negative ion purifying technology combines negative ions with micro-particles in the air to form large particles, which are easier to be filtered by a filter screen, so that the active negative ion purifying technology is more and more widely applied.

The common air filter screen is made of HEPA filter screen, the filter screen filtering structure is made of melt-blown electret non-woven material, and the common air filter screen has the characteristics of high efficiency, low resistance, small fiber linear density, large surface area, high filtering efficiency and the like, wherein the most important process is an electret process.

The automobile air conditioner filter disclosed in the Chinese patent with the application number of 201510491370.4 comprises a fixed frame, and a composite filter layer and an HEPA filter screen layer which are sequentially arranged in the fixed frame according to an air inlet direction, wherein the HEPA filter screen layer can effectively filter PM2.5 in air, the filtering efficiency is more than or equal to 75% and the filtering resistance is less than or equal to 6Pa for fine particles of 0.3 micron, the HEPA filter screen adopts a high-voltage electrostatic electret technology, the charge retention capacity is as long as 3 years, and the storage life is long; as disclosed in the chinese patent application No. 201520743435.5, the air purifier for classroom includes a concave housing and a fan, wherein the front side of the concave housing is provided with an air inlet, the fan is located in the inner cavity of the concave housing and is opposite to the air inlet, and a filter screen with a nano electret is arranged between the fan and the air inlet; four sides of the concave shell are provided with air outlets, an inner cavity of the concave shell is internally provided with a negative ion generator, a negative ion transmitting end is arranged between the air inlet and the filter screen, and an active carbon adsorption layer and an HEPA filter screen are sequentially arranged between the air outlets and the fan.

However, the filter screen adopting the electret process at present has some problems, such as the reduction of the filtering efficiency along with the time and the poor charge storage performance, and particularly, the charge can be quickly attenuated until disappears in the high-temperature and humid environment, so that the use performance of the product is greatly influenced. In reality, the user often has to replace the filter screen because the filter screen is out of order, which increases the use cost.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art and provides an air filter screen purifying device which can improve the filtering efficiency and prolong the service life of a filtering device.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an air filter screen purifier, includes filter screen collection device and anion generating device, on gaseous flow path, anion generating device is located electrically conductive filter screen device's upper reaches, anion generating device includes the anion probe that can be connected with negative high voltage power supply, is used for setting up anion probe's first frame, its characterized in that: the filter screen collection device includes the filter screen that connects positive high voltage power supply, ground connection when purifier is in the electret state when purifier is in the filter state, the filter screen is electrically conductive filter screen, negative ion generating device still includes the door electrode that connects positive high voltage power supply, does not connect the electricity when purifier is in the electret state when purifier is in the filter state, the connection can be dismantled in one side of first frame towards filter screen collection device to the door electrode.

Preferably, in order to improve the filtering capacity of particles of PM0.3um in the air and prolong the service life of the filter screen, the filter screen comprises a PET support body, a PP melt-spraying layer and a conductive coating formed by spraying a conductive material on the PET support body, so that the composite conductive filter screen is formed; the conductive filter screen is made of a high-voltage electret, and the capability of filtering particles is remarkably improved through high-voltage static electricity on the surface of the conductive filter screen, so that the particles of PM0.3um in the air are removed; on the other hand, bacteria carried to the surface of the filter screen can be killed in time, secondary harm is prevented, the service life of the filter screen can be prolonged, and the filter screen is green and environment-friendly.

For increase area of contact, promote the filter effect, the filter screen is the rugosity, the conductive coating of filter screen is towards anion generating device.

For making the air curtain contact time that air and ionic wind formed longer, the anion combines more fully with microparticle in the air, set up a plurality of interval arrangement's through-hole on the gate electrode, the through-hole is regular hexagon, and the head of every anion probe corresponds the centre of a circle department of regular hexagon's through-hole inscribed circle, between the head of through-hole and the anion probe that corresponds, have 3 ~ 4 cm's vertical distance on the gas flow route.

In order to facilitate the arrangement of the anion probe, the first frame comprises a hollow outer frame and at least two support bars arranged in parallel in the outer frame, each support bar is provided with a support groove which is sunken towards the direction of the filter screen collecting device from the surface far away from the filter screen collecting device, a PCB circuit board is further arranged in each support groove, and the head of the anion probe penetrates through the corresponding PCB circuit board and the support bars from one side, far away from the filter screen collecting decoration, of the first frame to penetrate towards the filter screen collecting device and is electrically connected with the PCB circuit board.

In order to enable the negative ions generated by the negative ion probes to be uniformly distributed, the negative ion probe on one PCB corresponds to the middle of two negative ion probes on the adjacent PCB, so that the negative ion probes of the two adjacent PCB are arranged in a staggered mode.

For the outside high voltage power supply of anion probe connection, the frame has by the surface of keeping away from filter screen collection device to the sunken holding recess of filter screen collection device direction, be provided with the conductive metal stick in the holding recess, PCB circuit board is connected with the conductive metal stick electricity, the conductive metal stick is connected with outside high voltage power supply through the first contact metal shell fragment that sets up on the frame, the holding recess coats and is stamped first sealing member.

In order to facilitate the connection of the gate electrode and the insulation between the first frame, the negative ion generating device further comprises a first cover plate, the first cover plate is arranged between the first frame and the gate electrode, the first cover plate is detachably connected with the outer frame, and the gate electrode is detachably connected with the first cover plate.

In order to facilitate the arrangement of the filter screen, the filter screen collecting device further comprises a second frame and a second cover plate, the filter screen is arranged inside the second frame, a second sealing element is arranged between the periphery of the filter screen and the second frame, and the second cover plate is arranged on one side, away from the negative ion generator, of the second frame so as to tightly seal the filter screen in the second frame.

In order to facilitate the connection of the filter screen with an external high-voltage power supply, the filter screen collecting device further comprises a conductive metal clamping piece and a second contact metal elastic piece arranged on the second frame, a notch is formed in the peripheral wall of the second sealing element, the conductive metal clamping piece is arranged in the notch, one side of the conductive metal clamping piece is clamped on the filter screen, and the other side of the conductive metal clamping piece is connected with the external high-voltage power supply through a conductive wire and the second contact metal elastic piece.

Compared with the prior art, the invention has the advantages that: the electric conductivity of the conductive filter screen is utilized to enhance the filtering effect, and simultaneously, when the electret function is started, the electric conductivity is used as a grounding electrode connected with the ground, so that the unification of the filtering and electret functions is realized on the basis of not increasing the devices; when the ion probe works, the gate electrode is electrified positively to form an ion air curtain with the probe, so that the combination effect of negative ions and microparticles in air is enhanced; the air duct is arranged into a modularized integral structure, and the matching can be completed only by reserving two positive electricity and negative electricity high-voltage contact elastic sheets in the air duct of the whole machine.

Drawings

FIG. 1 is a schematic view of a purification apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of an anion generating device of the purification apparatus according to the embodiment of the present invention;

FIG. 3 is an exploded view of the negative ion generator of the purification apparatus according to the embodiment of the present invention;

FIG. 4 is a schematic view of a first frame of the negative ion generating device of the purification apparatus according to the embodiment of the present invention;

FIG. 5 is a schematic view of a first cover plate of the negative ion generating device of the purification apparatus according to the embodiment of the present invention;

FIG. 6-1 is an enlarged schematic view of portion I of FIG. 3;

FIG. 6-2 is an enlarged schematic view of portion II of FIG. 3;

FIGS. 6-3 are enlarged schematic views of a portion III of FIG. 5;

FIG. 7 is a front view of the negative ion generating device of the purification apparatus according to the embodiment of the present invention;

FIG. 8 is a schematic view of a screen collecting device of the purification apparatus according to the embodiment of the present invention;

FIG. 9 is an exploded view of a strainer collecting device of the purification apparatus according to the embodiment of the present invention;

fig. 10 is a schematic view of a partially exploded structure of a filter screen collecting device of a purifying apparatus according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the following examples of the drawings.

Referring to fig. 1, an air screen purifying apparatus includes a negative ion generating device 1 and a screen collecting device 2, which may be provided in a reserve duct in a purifying device such as an air purifier, and the negative ion generating device 1 is located upstream of the screen collecting device 2 on a flow path of gas.

Referring to fig. 2 to 7, the negative ion generating device 1 includes a first frame 11, a first cover plate 12, a PCB circuit board 13, a negative ion probe 14, a first sealing member 15, and a gate electrode 16. The first frame 11 includes a hollow outer frame 111, and at least two parallel support bars 112 preferably disposed in parallel in the outer frame 111, in this embodiment, the outer frame 111 is rectangular, the number of the support bars 112 is two, the two support bars extend along the length direction of the outer frame 111 inside the outer frame 111, and two ends of each support bar 112 extend to the inner side wall of the outer frame 111 respectively.

Each support strip 112 has a support groove 113 which is recessed from the surface facing away from the sieve collector 2 in the direction of the sieve collector 2. A negative ion probe 14 is provided in each support groove 113. Each support groove 113 is further provided with one PCB 13, the head of the negative ion probe 14 penetrates through the corresponding PCB 13 and the support bar 112 from the side of the first frame 11 away from the filter screen collecting decoration 2 to face the filter screen collecting device 2, and is electrically connected to the PCB 13, and 4-5 negative ion probes 14 are preferably arranged on each PCB 13.

The outer frame 111 has a receiving groove 114 recessed from the surface far away from the screen collecting device 2 toward the screen collecting device 2, in this embodiment, the receiving groove 114 is an annular extending along the inner side wall of the outer frame 111, the corresponding ends of the two PCB boards 13 extend into the receiving groove 114 of the outer frame 111, and the receiving groove 114 is provided with a conductive metal bar 17 therein, and is electrically connected to each PCB board 13. The outer frame 111 is further provided with a first contact metal spring 18, the first contact metal spring 18 extends from the outer side wall of the outer frame 111 to the accommodating groove 114, and the conductive metal rod 17 is electrically connected with the portion of the first contact metal spring 18 located in the accommodating groove 114 through a fixing screw 171. The receiving groove 114 of the outer frame 111 is covered with a first sealing member 15, such as a sealing sponge, so as to seal the conductive metal rod 17 and the first contact metal spring piece 18 in the outer frame 111, thereby reducing noise and reducing gaps of the first frame 11.

With reference to fig. 6 to 1 and 6 to 3, the first cover plate 12 is disposed on one side of the first frame 11 facing the strainer collecting device 2, an annular first step portion 115 is formed on one side of the outer frame 111 of the first frame 11 facing the first cover plate 12, and the first step portion 115 is inwardly contracted relative to the outer frame 111 and extends toward the first cover plate 12, so as to install the first cover plate 12, and make the outer peripheral wall of the first cover plate 12 flush with the outer peripheral wall of the outer frame 111, thereby ensuring that the entire outer side of the negative ion generating device 1 is flush. An outer peripheral wall of the first stepped portion 115 is formed with a connecting groove 116 recessed inward. The first cover plate 12 has a ring shape, and an inner circumferential wall thereof is provided with a protrusion 121 protruding inward, and the protrusion 121 can be snapped into the coupling groove 116, thereby coupling the first cover plate 12 and the first frame 11. The positions of the coupling groove 116 and the projection 121 may be interchanged.

With reference to fig. 6-2, a second step 122 is formed on the inner periphery of the first cover 12, and the second step 122 is recessed toward the first frame 11 and extends inward, and the gate electrode 16 is made of metal and is disposed on the first cover 12 on the side away from the first frame 11 and covers the second step 122. The second step portion 122 is provided with a buckle 123 facing the gate electrode 16, a clamping groove 161 is formed on the periphery of the gate electrode 16, the position of the buckle 123 corresponds to the clamping groove 161, and the buckle 123 can be clamped into the clamping groove 161, so that the first cover plate 12 and the gate electrode 16 are connected. The positions of the catch 123 and the pocket 161 may be interchanged. The first cover plate 12 is made of an insulating material, and in this way, the first frame 11, which is also connected to a high voltage source, and the gate electrode 16 are prevented from interfering with each other.

In order to make the negative ions formed by the negative ion probes 14 uniformly distributed, the negative ion probes 14 on the two PCB boards 13 are arranged in a staggered manner, and the distance between the negative ion probes 14 on the same PCB board 13 is preferably 65 mm. The staggered arrangement means that the negative ion probe 14 on one PCB 13 corresponds to the middle of two negative ion probes 14 on the other PCB 13. The gate electrode 16 is provided with a plurality of through holes 162 arranged at intervals, the through holes 162 are regular hexagons, and the head of each negative ion probe 14 corresponds to the center of a circle inscribed in the regular hexagons of the through holes 162. The side length of the through hole 162 is preferably 16mm, and the distance between two adjacent through holes 162 is preferably 32.5 mm. In order to make the air curtain formed by the air and the ion wind contact for a longer time and make the negative ions and the micro-particles in the air combine more fully, the vertical distance between the through hole 162 of the gate electrode 16 and the head of the corresponding negative ion probe 14 on the gas flow path is 3-4 cm.

Referring to fig. 8 and 9, the screen collecting device 2 includes a second frame 21, a screen 22, a second cover plate 23, a second sealing member 24, a conductive metal clip 25, and a second contact metal dome 26. The second frame 21 and the conductive screen 22 are also rectangular to fit the negative ion generating device 1. The second frame 21 is made of an insulating material, such as ABS plastic, to ensure an insulating relationship with the surrounding complete machine (decontamination apparatus).

The filter 22 is a conductive filter, which is formed by spraying a layer of conductive material on the basis of the conventional HEPA filter to make it conductive without damaging its original filtering efficiency, and then folding it into a cylindrical structure, such as a cylinder (described in detail below). The filter screen 22 can be an existing conductive filter screen, or a conductive filter screen manufactured by the manufacturing method of the present invention. The screen 22 is disposed inside the second frame 21, and an annular second sealing member 24, such as a sealing sponge, is disposed between the periphery of the screen 22 and the second frame 21, so that the screen 22 can be fixed. A second cover plate 23 is provided on a side of the second frame 21 remote from the anion generator 1 so as to enclose the filter net 22 in the second frame 21. When installed, the surface of the filter screen 22 to which the conductive material is applied is oriented toward the negative ion generating device 1 (i.e., toward the direction of gas flow).

Referring to fig. 10, the screen 22 includes a PET support 221, a PP meltblown layer 222, and a conductive coating 223, which are combined to form a conductive HEPA screen. Specifically, the method comprises the following steps:

preparing antibacterial conductive coating

Mixing and mixing the graphene slurry, deionized water and waterborne polyurethane according to a ratio, and stirring for 1-4 h; dropwise adding a defoaming agent while stirring, wherein the addition amount of the defoaming agent is 0.05-1% of the total weight of the graphene slurry, the deionized water and the waterborne polyurethane; the defoaming agent in the embodiment is defoaming agent BYK 019.

Then adding nano silver ions and chitin solution, and continuously stirring uniformly to obtain the antibacterial conductive coating;

nano silver ion: chitin solution: graphene slurry: deionized water: the proportion of the waterborne polyurethane is 1.5:4:21:21: 7-3: 10:21:21: 21;

the graphene slurry is a deionized water mixture with the solid content of graphene being 2.5 wt%; the viscosity of the graphene slurry is 0.03 pa.s; the viscosity of the aqueous polyurethane was 0.01 pa.s.

The chitin solution is a commercially available chitin finishing agent SAL 6680.

The nano silver ion is a commercial nano silver antibacterial finishing agent SILV 9700.

② preparing filter paper

Placing the PET support 221 and the PP melt-blown layer 222 on two different conveyor belts, wherein the PET support 221 is subjected to glue dispensing through a nozzle of a glue gun, and the PET support 221 is subjected to glue dispensing through the glue gun, wherein the glue dispensing amount is 5g/m ² (ii) a The PET support body 221 after the glue dispensing is adhered with a PP melt-blown layer 222 on another conveying belt, and after the adhesion is finished, the PET support body enters a press roll to be pressed firmly to form a fiber filter screen, and the fiber filter screen is rolled into a coiled material for standby.

The PET support 221 used in this example had a grammage of 70g/m ² The PET fiber fabric of (1); the PP meltblown layer 222 is a PP nonwoven meltblown with a filament diameter of 15 microns;

preparing composite conductive filter screen

Coating the antibacterial conductive coating prepared in the first step on the surface of the PET support body 221 prepared in the second step to form a conductive coating 223, wherein the thickness of the coating is 1-5 microns, and thus obtaining filter paper; and folding the filter paper by a conventional method to obtain the composite conductive filter screen with antibacterial and conductive properties, wherein the conductive coating 223 faces outwards in the folding process.

The composite conductive filter screen prepared by the method is made of high-voltage electret, and the capability of filtering particles is obviously improved through high-voltage static on the surface of the conductive filter screen, so that the particles of PM0.3um in the air are removed; on the other hand, bacteria carried to the surface of the filter screen can be killed in time, secondary harm is prevented, the service life of the filter screen can be prolonged, and the filter screen is green and environment-friendly.

A gap 241 is formed in the peripheral wall of the second sealing element 24, the conductive metal clip 25 is disposed in the gap 241, the second frame 21 is provided with a second contact metal spring 26, and the second contact metal spring 26 extends from the outer side of the second frame 21 to the inside of the second frame 21. The conductive metal clip 25 is clamped on the filter screen 22 at one side and connected to the second contact metal spring 26 at the other side through a conductive wire.

In the filtering working state, the first contact metal spring piece 18 of the negative ion generating device 1 is electrically connected to the negative 3kv high voltage, so that the negative ion probe 14 is connected to the negative high voltage, and is ionized under the high voltage to generate negative ions, meanwhile, the gate electrode 16 is connected to the positive 3kv high voltage, centrifugal wind is formed between the negative ion probe 14 and the gate electrode 16, due to the distance between the gate electrode 16 and the head of the negative ion probe 14, the contact time of the air curtain formed by air and ion wind is longer, and the negative ions are combined with micro-particles in the air more fully. Meanwhile, the filter screen 22 of the filter screen collecting device 2 is connected with positive 3kv high voltage electricity through the second contact metal elastic sheet 26, microparticles combined with negative ions are attracted by the filter screen 22 through positive electricity, and the filtering efficiency is greatly improved by the filtering function of the original filter screen.

Along with the increase of the filtering time, the filtering efficiency is gradually reduced until the filtering efficiency is invalid, at the moment, the filtering efficiency of the filter screen is restored through the electret restoration function of the door electrode 16, the electret mode is started after the filter screen is invalid, when the electret state is started, the negative ion probe 14 is connected with negative 10kv high voltage, the door electrode 16 is not electrified, the conductive coating 223 of the filter screen 22 is grounded to provide a grounding electrode required by the electret process, so that the electret function is realized, and the filtering efficiency of the filter screen is restored.

The filter device disclosed by the invention adopts the composite conductive filter screen, combines the advantages of the negative ion active adsorption technology and the electrostatic adsorption technology, utilizes the combination of negative ions generated by the negative ion generating device and particles to form particles with larger particle size, meanwhile, the filter screen is positively charged by the composite technology on the basis of the original HEPA filter screen, the positive electricity of the filter screen and the negative ions form an ion flow, and microparticles are better absorbed by the filter screen under the drive of the fan and the ion flow. The compound electrically conductive filter screen technique can greatly improve the absorption of HEPA filter screen to particle size particulate matter below pm 0.3.

Claims

1. An air screen purifier, includes filter screen collection device (2) and anion generating device (1), on gaseous flow path, anion generating device (1) is located the upstream of filter screen collection device (2), anion generating device is including anion probe (14) that can be connected with negative high voltage power supply, be used for setting first frame (11) of anion probe (14), its characterized in that: the filter screen collecting device (2) comprises a filter screen (22) which is connected with a positive high-voltage power supply when the purifying device is in a filtering state and is grounded when the purifying device is in an electret state, the filter screen (22) is a conductive filter screen, the negative ion generating device (1) further comprises a door electrode (16) which is connected with the positive high-voltage power supply when the purifying device is in the filtering state and is not connected with electricity when the purifying device is in the electret state, and the door electrode (16) is detachably connected to one side, facing the filter screen collecting device (2), of the first frame (11);

the first frame (11) comprises a hollow outer frame (111) and at least two support bars (112) which are arranged in the outer frame (111) in parallel, each support bar (112) is provided with a support groove (113) which is recessed towards the direction of the filter screen collecting device (2) from the surface far away from the filter screen collecting device (2), a PCB (printed circuit board) (13) is further arranged in each support groove (113), and the head of the negative ion probe (14) penetrates through the corresponding PCB (13) and the support bars (112) from one side, far away from the filter screen collecting device (2), of the first frame (11) to face the filter screen collecting device (2) and is electrically connected with the PCB (13);

the negative ion probe (14) on one PCB (13) corresponds to the middle of two negative ion probes (14) on the adjacent PCB (13), so that the negative ion probes (14) of the two adjacent PCB (13) are arranged in a staggered mode.

2. The air screen purification device of claim 1, wherein: the filter screen (22) comprises a PET support body (221), a PP melt-blown layer (222) and a conductive coating (223) formed by spraying a conductive material on the PET support body (221), so that the composite conductive filter screen is formed.

3. The air screen purification device of claim 2, wherein: the filter screen (22) is folded, and the conductive coating (223) of the filter screen (22) faces the negative ion generating device (1).

4. An air screen purification device according to any one of claims 1 to 3, wherein: the gate electrode (16) is provided with a plurality of through holes (162) which are arranged at intervals, the through holes (162) are in a regular hexagon shape, the head of each negative ion probe (14) corresponds to the circle center of an inscribed circle of the through hole (162) in the regular hexagon shape, and a vertical distance of 3-4 cm is arranged between the head of each through hole (162) and the head of the corresponding negative ion probe (14) on a gas flow path.

5. An air screen purification device according to any one of claims 1 to 3, wherein: frame (111) have by keeping away from the sunken holding recess (114) of surface to filter screen collection device (2) direction of filter screen collection device (2), be provided with electrically conductive metal bar (17) in holding recess (114), PCB circuit board (13) are connected with electrically conductive metal bar (17) electricity, electrically conductive metal bar (17) are connected with outside high voltage power supply through setting up first contact metal shell fragment (18) on frame (111), holding recess (114) coats and is stamped first sealing member (15).

6. An air screen purification device according to any one of claims 1 to 3, wherein: the negative ion generating device (1) further comprises a first cover plate (12), the first cover plate (12) is arranged between the first frame (11) and the gate electrode (16), the first cover plate (12) is detachably connected with the outer frame (111), and the gate electrode (16) is detachably connected with the first cover plate (12).

7. An air screen purification device according to any one of claims 1 to 3, wherein: the filter screen collecting device (2) further comprises a second frame (21) and a second cover plate (23), the filter screen (22) is arranged inside the second frame (21), a second sealing element (24) is arranged between the periphery of the filter screen (22) and the second frame (21), and the second cover plate (23) is arranged on one side, far away from the negative ion generating device (1), of the second frame (21) and tightly seals the filter screen (22) in the second frame (21).

8. The air screen purification device of claim 7, wherein: the filter screen collecting device (2) further comprises a conductive metal clamping piece (25) and a second contact metal elastic piece (26) arranged on the second frame (21), a notch (241) is formed in the peripheral wall of the second sealing element (24), the conductive metal clamping piece (25) is arranged in the notch (241), one side of the conductive metal clamping piece (25) is clamped on the filter screen (22), and the other side of the conductive metal clamping piece is connected with the second contact metal elastic piece (26) through a conductive wire so as to be connected with an external high-voltage power supply.