CN117190377A - Electric purifying device and air curtain machine - Google Patents

Abstract

The application relates to an electric purification device and an air curtain machine. The electric purification device comprises a discharge assembly and at least one electric purification device, wherein each electric purification device comprises at least one discharge unit, each discharge unit comprises a plurality of linear corona discharge electrodes and annular grounding electrodes which are fixedly arranged, all the corona discharge electrodes and the annular grounding electrodes are oppositely arranged along a first direction, and all the corona discharge electrodes are radially arranged towards one side close to the annular grounding electrodes; and the insulating back corona piece is arranged on one side of the annular grounding electrode, which is away from the corona discharge electrode, along the first direction. All corona discharge electrodes are radially arranged on one side close to the annular grounding electrode, so that the area of a corona discharge area can be increased, an electric field similar to a cone can be formed, the corona discharge area is compact, germs such as smoke, peculiar smell, spray and aerosol in a closed space can be concentrated and rapidly treated, and in addition, back corona discharge is generated by arranging an insulating back corona piece, so that a better purifying effect can be achieved.

Description

Electric purifying device and air curtain machine

Technical Field

The application relates to the technical field of air purification, in particular to an electric purification device and an air curtain machine.

Background

With the economic development and the improvement of the life quality of people, the requirements on the air cleanliness degree are higher and higher, and air purifying equipment is generated.

The air purifying device based on the plasma technology has the capabilities of filtering, sterilizing, disinfecting, removing formaldehyde and the like, and is widely applied to daily life due to the advantages of low pollution, low consumption and the like. However, when the plasma air purification device is used in a miniaturized conference place such as a business meeting, a collective meeting and the like, smoke and peculiar smell gather in a closed space, germs such as spray, aerosol and the like are easier to spread in the process of personnel talking, and the plasma air purification device in the related art cannot achieve a concentrated and good purification effect in the place.

Disclosure of Invention

Accordingly, it is necessary to provide an electric purification apparatus and an air curtain machine capable of achieving a concentrated and good purification effect against the problem that the plasma air purification apparatus in the related art cannot achieve the concentrated and good purification effect in the place.

In a first aspect, there is provided an electrical purification apparatus comprising:

the discharge assembly comprises at least one discharge unit, each discharge unit comprises a plurality of linear corona discharge electrodes and annular grounding electrodes which are fixedly arranged, all the corona discharge electrodes and the annular grounding electrodes are oppositely arranged along a first direction, and all the corona discharge electrodes are radially arranged towards one side close to the annular grounding electrodes; and the insulating back corona piece is arranged on one side of the annular grounding electrode, which is away from the corona discharge electrode, along the first direction.

Above-mentioned electric purification device is radial setting to the one side that is close to annular earthing pole through setting up whole corona discharge electrode, not only can increase corona discharge's regional area, and can form the electric field region of similar taper for corona discharge's region is compact, so can concentrate and rapidly handle germ such as flue gas, peculiar smell, spray and aerosol in the airtight space, produces back corona discharge through setting up insulating back corona spare in addition, can have better purifying effect.

In one embodiment, the corona discharge electrode is a carbon fiber corona discharge electrode.

In one embodiment, each of the discharge assemblies includes a plurality of discharge cells, and all of the discharge cells of each of the discharge assemblies are arranged in an array along a direction intersecting the first direction.

In one embodiment, the insulating back corona includes a first insulating layer and a conductive layer stacked in a first direction, the first insulating layer being disposed closer to the annular ground electrode than the conductive layer;

the first insulating layer forms a plurality of first protruding portions on a side facing away from the conductive layer.

In one embodiment, the discharge assembly includes two sets of discharge assemblies disposed opposite each other in a first direction, and the insulating back corona is disposed between the two sets of discharge assemblies.

In one embodiment, the polarity of the electrodes between the two sets of discharge elements is reversed.

In one embodiment, the insulating back corona includes a first insulating layer, a conductive layer, and a second insulating layer stacked in a first direction, the first insulating layer being disposed toward one of the discharge assemblies, the second insulating layer being disposed toward the other of the discharge assemblies;

the first insulating layer forms a plurality of first protruding parts on one side away from the conductive layer; and/or

The second insulating layer forms a plurality of second protruding portions on a side facing away from the conductive layer.

In one embodiment, the first insulating layer and the second insulating layer have a resistance of 10 ⁸ ～10 ⁹ Ohmic.

In a second aspect, there is also provided an air curtain machine comprising an electrical purification apparatus as in any of the embodiments described above.

In one embodiment, the air curtain machine comprises a shell and a through-flow or centrifugal fan, wherein the through-flow or centrifugal fan is arranged in the shell, the shell is provided with an air inlet, and the electric purification device is arranged between the air inlet and the through-flow or centrifugal fan along the air flow direction.

Above-mentioned electric purification device and air curtain machine are radial setting to the one side that is close to annular earthing pole through setting up whole corona discharge electrode, not only can increase corona discharge's regional area, and can form the electric field region of similar taper for corona discharge's region is compact, so can concentrate and rapidly handle germ such as flue gas, peculiar smell, spray and aerosol in the airtight space, produces back corona discharge through setting up insulating back corona spare in addition, can have better purifying effect. And through setting up electric purification device on the air curtain machine, can carry out purification treatment to the high-speed air of air curtain machine inspiratory, and then make the air curtain that forms reach better isolated effect.

Drawings

FIG. 1 is a schematic view of an electrical purification apparatus in one or more embodiments of the application.

Fig. 2 is a schematic diagram of an electrical purification apparatus in one or more embodiments of the application.

Fig. 3 is a schematic diagram illustrating a discharge unit according to one or more embodiments of the present application.

Fig. 4 is a schematic diagram of a discharge assembly according to one or more embodiments of the application.

FIG. 5 is a schematic view of an air curtain in one or more embodiments of the application.

Reference numerals illustrate:

the electric purification device 100, the discharge assembly 10, the discharge unit 11, the corona discharge electrode 111, the annular grounding electrode 112, the insulating back corona member 20, the first insulating layer 21, the first protruding portion 211, the conductive layer 22, the second insulating layer 23, the second protruding portion 231, the air curtain machine 200, the housing 210, the through-flow or centrifugal fan 220, and the air inlet 230.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1, fig. 1 shows a schematic view of an electric purification apparatus according to an embodiment of the present application, and fig. 2 shows a schematic view of an electric purification apparatus according to an embodiment of the present application. An embodiment of the present application provides an electrical purification apparatus comprising a discharge assembly 10 and an insulating back corona 20.

The discharge assembly 10 may be understood as an assembly capable of polarizing the charge of dust in the air. Specifically, when the discharge assembly 10 is charged with a voltage, nearby air molecules are polarized (ionized), polarized charged polar particles are attached to dust particles flowing through the air, so that the dust particles are charged (charged), and the charged dust particles move towards the low-potential metal dust collecting electrode under the action of an electric field, and then fall on the surface of the metal dust collecting electrode, thereby achieving the purpose of purifying the air.

Specifically, the discharge assembly 10 includes at least one discharge unit 11, each discharge unit 11 includes a plurality of linear corona discharge electrodes 111 and an annular grounding electrode 112, all the corona discharge electrodes 111 and the annular grounding electrode 112 are disposed opposite to each other along the first direction, and all the corona discharge electrodes 111 are disposed radially toward a side close to the annular grounding electrode 112.

Specifically, the first direction is the horizontal direction X shown in fig. 1.

The corona discharge electrode 111 may be charged with a positive high voltage or a negative high voltage. After the corona discharge electrode 111 is applied with a voltage, discharge is performed through its tip, thereby ionizing air in the vicinity and generating corona discharge. The ring-shaped ground electrode 112 should be grounded. After the corona discharge is generated, the dust particles after the charge move to the annular grounding electrode 112 with low potential under the action of an electric field, and thus fall on the surface of the annular grounding electrode 112.

All corona discharge electrodes 111 are radially disposed to a side adjacent to the annular ground electrode 112 means that all corona discharge electrodes 111 are gathered, e.g., bound together or unbound together but adjacent to each other at an end remote from the annular ground electrode 112 and are umbrella-like dispersed at an end adjacent to the annular ground electrode 112. Specifically, one end of each corona discharge electrode 111 close to the annular grounding electrode 112 is directed to the annular grounding electrode 112, and all corona discharge electrodes 111 are arranged in a manner that the collection center of one end far from the annular grounding electrode 112 coincides with the center line of the annular grounding electrode 112. Thus, the electric field distribution can be made uniform.

When all the corona discharge electrodes 111 are radially arranged to the side close to the annular grounding electrode 112, gaps are formed between the corona discharge electrodes 111, and mutual exclusion can occur between the corona discharge electrodes 111 due to charges with the same polarity, and the area of the corona discharge area can be increased because all the corona discharge electrodes 111 are radially arranged to the side close to the annular grounding electrode 112.

All corona discharge electrodes 111 and annular grounding electrode 112 may be fixedly disposed in an external installation environment, such as a housing 210 of an air curtain machine 200 described later, or a fixing frame may be disposed on the electric purification device 100 according to an embodiment of the present application, so that all corona discharge electrodes 111 and annular grounding electrode 112 are fixed, and the positions between them are kept relatively fixed.

The insulating back corona 20 refers to a member capable of generating back corona discharge. Specifically, when dust particles charged by the discharge assembly 10 accumulate on the insulating surface of the insulating back corona member 20, a back electric field is formed on the insulating surface of the insulating back corona member 20, the electric field becomes stronger with the accumulation of electric charges, and when the electric charges accumulate to an intensity that can ionize the nearby air, back corona discharge occurs, thereby continuing to purify the air.

Therefore, in the electric purification apparatus 100 according to the embodiment of the present application, by providing all the corona discharge electrodes 111 radially disposed on the side close to the annular grounding electrode 112, not only the area of the corona discharge region can be increased, but also a cone-like electric field region (as shown by the dotted line region in fig. 3) can be formed, so that the corona discharge region is compact, and therefore, germs such as smoke, odor, droplets and aerosol in the enclosed space can be concentrated and rapidly treated, and in addition, back corona discharge can be generated by providing the insulating back corona member 20, which can have a better purification effect.

Referring to fig. 2 and 3, in particular to an embodiment of the present application, the corona discharge electrode 111 is a carbon fiber corona discharge electrode.

The carbon fiber corona discharge electrode is made of carbon fiber.

The carbon fiber corona discharge electrode has lower field effect and can generate corona discharge at lower voltage.

In other embodiments, the corona discharge electrode 111 may be a tungsten wire corona discharge electrode or a corona discharge electrode made of other metal materials, and is not particularly limited.

Referring to fig. 4, in some embodiments, each of the discharge assemblies 10 includes a plurality of discharge cells 11, and all of the discharge cells 11 of each of the discharge assemblies 10 are arranged in an array along a direction intersecting the first direction.

Specifically, the direction intersecting the first direction may include a vertical direction Z as shown in fig. 1, and may also include a direction Y perpendicular to the paper surface as shown in fig. 1. In the embodiment of the present application, all the discharge cells 11 of each discharge assembly 10 are arranged in an array in the Z and Y directions.

By arranging all the discharge units 11 of each discharge assembly 10 in an array along the intersecting direction of the first direction, on one hand, the purification area can be increased, on the other hand, the empty space between the discharge units 11 is small, and more charges are generated by corona discharge of the discharge units 11, so that the purification efficiency is improved.

Specifically, all discharge cells 11 of each discharge element 10 are arranged in 4 rows in the Y direction and in 7 rows in the Z direction. It should be noted that the arrangement and the number of all the discharge units 11 of the discharge assembly 10 can be adaptively adjusted according to the air inlet area of the air purifying device, so as to improve the purifying efficiency.

Referring again to fig. 2, in some embodiments, the insulating back corona 20 includes a first insulating layer 21 and a conductive layer 22 stacked in a first direction, the first insulating layer 21 being disposed closer to the annular ground 112 than the conductive layer 22.

By providing the conductive layer 22 and the first insulating layer 21, conductivity can be formed, so that the dust particles after charging of the discharge assembly 10 move to the insulating back corona member 20, and then the dust particles after charging accumulate on the surface of the first insulating layer 21, and the first insulating layer 21 does not conduct away all charges due to higher resistance, so that a back electric field is formed between the corona discharge electrode 111 of the discharge unit 11 and the conductive layer 22, and back corona discharge is generated.

Specifically, the conductive layer 22 is also a low-potential metal layer, and the conductive layer 22 may be grounded.

In order to enhance the non-uniform discharge between the corona discharge electrode 111 of the discharge unit 11 and the conductive layer 22 and to reliably generate the back corona discharge, the cleaning effect is improved, and further, the first insulating layer 21 is formed with a plurality of first protrusions 211 at a side facing away from the conductive layer 22.

The plurality of first protrusions 211 can form a plurality of discharge tips, thereby ionizing the nearby air to create individual back corona fields.

Specifically, the first protrusion 211 may have a cone shape, a needle shape, or the like.

In an embodiment of the present application, the discharge assembly 10 includes two sets of discharge assemblies 10 disposed opposite each other in the first direction, and the insulating back corona 20 is disposed between the two sets of discharge assemblies 10.

Thus, the space on both sides of the insulating back corona 20 can be utilized to realize simultaneous purification on both sides, thereby improving the purification efficiency.

Alternatively, the two sets of discharge assemblies 10 are symmetrically disposed with respect to the insulating back corona 20.

Further, the polarity of the electrodes between the two sets of discharge assemblies 10 is reversed.

The opposite electrode polarity means that one of the discharge elements 10 is loaded with a positive high voltage, and the other discharge element 10 is loaded with a negative high voltage, so that positive electrode polarity particles and negative electrode polarity particles can be respectively excited to be respectively combined with dust particles in the air.

By arranging the electrodes between the two groups of discharge assemblies 10 with opposite polarities, positively charged dust particles and negatively charged dust particles can be obtained, and the positively charged dust particles and the negatively charged dust particles can be electrically coagulated on the insulating back corona member 20, so that the combination can be carried out and can be settled on the insulating back corona member 20, the sufficient collection of pollutants and the like is ensured, and the purification effect is improved.

In some embodiments, the insulating back corona 20 includes a first insulating layer 21, a conductive layer 22, and a second insulating layer 23 stacked in a first direction, the first insulating layer 21 being disposed toward the annular ground 112 of one of the discharge assemblies 10, and the second insulating layer 23 being disposed toward the annular ground 112 of the other discharge assembly 10.

In this way, the dust particles after being charged in one of the discharge assemblies 10 move toward the first insulating layer 21 of the insulating back corona 20, and then accumulate on the surface of the first insulating layer 21, and the dust particles after being charged in the other discharge assembly 10 move toward the second insulating layer 23 of the insulating back corona 20, and then accumulate on the surface of the second insulating layer 23. Both the first insulating layer 21 and the second insulating layer 23 have a relatively high resistance, and thus do not conduct away all charges, so that a back electric field is formed between the corona discharge electrode 111 and the conductive layer 22 of the corresponding discharge cell 11, respectively, and back corona discharge is generated.

Specifically, the insulating back corona 20 is a composite plate formed by combining a first insulating layer 21, a conductive layer 22, and a second insulating layer 23.

In order to enhance the non-uniform discharge between the corona discharge electrode 111 of the discharge unit 11 and the conductive layer 22 and to reliably generate the back corona discharge, the cleaning effect is improved, and further, the first insulating layer 21 is formed with a plurality of first protrusions 211 at a side facing away from the conductive layer 22. Likewise, the second insulating layer 23 may also have a plurality of second protrusions 231 on the side facing away from the conductive layer 22. Note that the convex arrangement of the first insulating layer 21 and the second insulating layer 23 may be provided at the same time, or only one of them may be provided.

The first and second protrusions 211 and 231 can form a plurality of discharge tips, which ionize the nearby air, creating individual back-corona fields.

Specifically, the first and second protrusions 211 and 231 may be tapered, needle-shaped, or the like.

In the embodiment of the present application, the resistance value of the first insulating layer 21 and the second insulating layer 23 is 10 ⁸ ～10 ⁹ Ohmic.

It was found that by providing the first insulating layer 21 and the second insulating layer 23 with a resistance value of 10 ⁸ ～10 ⁹ Ohmic, a back electric field can be effectively formed between the corona discharge electrode 111 of the discharge cell 11 and the conductive layer 22, thereby generating back corona discharge.

With reference to fig. 2 and 5, based on the same inventive concept, the present application also provides an air curtain machine 200 including the electric cleaning apparatus 100 of any of the above embodiments.

The air curtain machine 200 is a strong air flow generated by driving a through-flow or centrifugal wind wheel through a high-speed motor to form an invisible door curtain, namely an air curtain, and further forms an air isolation layer by means of the air curtain, so that the spread of spray and aerosol germs in the conversation process of personnel in a miniaturized conference place can be reduced, and the spread of part of peculiar smell can be isolated through the air curtain, so that a healthy and comfortable working environment is created.

Therefore, by providing the electric purifying device 100 in the air curtain machine 200, the high-speed air sucked by the air curtain machine 200 can be purified, and the formed air curtain can achieve a better isolation effect.

Specifically, the air curtain machine 200 includes a casing 210 and a through-flow or centrifugal fan 220, the through-flow or centrifugal fan 220 is disposed in the casing 210, the casing 210 is provided with an air inlet 230, and the electric purification device 100 is disposed between the air inlet 230 and the through-flow or centrifugal fan 220 along the airflow direction.

In this way, when the air curtain 200 is opened and the cross flow fan or the centrifugal fan 220 is operated, a suction force is generated to make the air enter the housing 210 from the air inlet 230, and at this time, the electric purification apparatus 100 is disposed between the air inlet 230 and the cross flow fan or the centrifugal fan 220, so that the air can be purified.

More specifically, corona discharge electrode 111 of discharge assembly 10 of electrical purification apparatus 100 is secured at air inlet 230, and annular ground electrode 112 is disposed on an inner side of corona discharge electrode 111 facing away from air inlet 230.

When the discharge assembly 10 includes a plurality of discharge units 11, the corona discharge electrodes 111 of the plurality of discharge units 11 are arranged at the air inlet 230, so that the air inlet 230 is entirely covered in the electric field formed by the discharge assembly 10, and the interaction between the air entering from the air inlet 230 and the electric field member is increased, thereby improving the purifying effect.

In some embodiments, an insulating grid is provided at the air inlet 230, at which the corona discharge electrode 111 is secured.

In this way, the corona discharge electrode 111 can be reliably and safely charged with high voltage without affecting the intake air of the intake port 230.

In the embodiment of the application, the air inlet 230 of the housing 210 includes two sets of two discharge assemblies 10 disposed opposite to each other, and each discharge assembly 10 is disposed corresponding to one air inlet 230.

Thus, when the air inlets 230 at the two sides are respectively supplied with air, the two groups of discharge assemblies 10 can simultaneously purify the air supplied from the two positions, thereby improving the purification efficiency and the purification effect.

In summary, in the air curtain machine 200 according to the embodiment of the present application, the electric purification device 100 can be compactly arranged in the air curtain machine 200, and can achieve good single purification efficiency at a higher wind speed, and the energy of the back corona field can also achieve effective removal of gaseous pollutants.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. An electrical purification apparatus, comprising:

the discharge assembly (10) comprises at least one discharge unit (11), wherein each discharge unit (11) comprises a plurality of linear corona discharge electrodes (111) and annular grounding electrodes (112) which are fixedly arranged, all the corona discharge electrodes (111) and the annular grounding electrodes (112) are oppositely arranged along a first direction, and all the corona discharge electrodes (111) are radially arranged towards one side close to the annular grounding electrodes (112); and

an insulating back corona (20) is provided along the first direction on a side of the annular ground electrode (112) facing away from the corona discharge electrode (111).

2. An electrical purification apparatus according to claim 1, wherein the corona discharge electrode (111) is a carbon fiber corona discharge electrode (111).

3. The electrical purification apparatus of claim 1, wherein each of said discharge assemblies (10) comprises a plurality of said discharge cells (11), all of said discharge cells (11) of each of said discharge assemblies (10) being arranged in an array along a direction intersecting said first direction.

4. The electrical purification apparatus of claim 1, wherein the insulating back corona (20) comprises a first insulating layer (21) and a conductive layer (22) arranged in a stack along the first direction, the first insulating layer (21) being arranged closer to the annular ground electrode (112) than the conductive layer (22);

the first insulating layer (21) forms a plurality of first projections (211) on a side facing away from the conductive layer (22).

5. An electrical purification apparatus as claimed in claim 1, wherein said discharge assembly (10) comprises two sets of said discharge assemblies (10) arranged opposite each other in said first direction, said insulating back corona member (20) being arranged between said two sets of discharge assemblies (10).

6. An electrical purification apparatus as claimed in claim 5, wherein the polarity of the electrodes between the two sets of discharge assemblies (10) is reversed.

7. The electrical purification apparatus of claim 5, wherein the insulating back corona (20) comprises a first insulating layer (21), a conductive layer (22) and a second insulating layer (23) arranged in a stack along the first direction, the first insulating layer (21) being arranged towards one of the discharge assemblies (10) and the second insulating layer (23) being arranged towards the other of the discharge assemblies (10);

the first insulating layer (21) forms a plurality of first protrusions (211) on a side facing away from the conductive layer (22); and/or

The second insulating layer (23) forms a plurality of second protrusions (231) on a side facing away from the conductive layer (22).

8. The electrical purification apparatus of claim 7, wherein the first insulating layer (21) and the second insulating layer (23) have a resistance value of 10 ⁸ ～10 ⁹ Ohmic.

9. An air curtain machine, characterized by comprising an electrical purification apparatus (100) according to any one of claims 1-8.

10. The air curtain machine according to claim 9, wherein the air curtain machine comprises a housing (210) and a through-flow or centrifugal fan (220), the through-flow or centrifugal fan (220) is arranged in the housing (210), the housing (210) is provided with an air inlet (230), and the electric purification device (100) is arranged between the air inlet (230) and the through-flow or centrifugal fan (220) along the airflow flowing direction.