Electro purification device and air curtain machine
By designing discharge components and insulating anti-corona components in a small, enclosed space, the electro-purification device solves the problem of poor purification effect of plasma air purification equipment in small, enclosed spaces, and achieves rapid purification of pathogens such as smoke, odors, droplets and aerosols, as well as enhanced isolation effect of the air curtain.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GREE ELECTRIC APPLIANCE INC OF ZHUHAI
- Filing Date
- 2023-10-25
- Publication Date
- 2026-06-12
Smart Images
Figure CN117190377B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of air purification technology, and in particular to electro-purification devices and air curtain machines. Background Technology
[0002] With economic development and the improvement of people's living standards, the requirements for air cleanliness are getting higher and higher, and air purification equipment has emerged as a result.
[0003] Air purification equipment based on plasma technology possesses capabilities such as filtration, sterilization, disinfection, and formaldehyde removal, and is widely used in daily life due to its advantages of low pollution and low consumables. However, in small meeting spaces such as business conferences and group meetings, smoke and odors accumulate in enclosed spaces, and germs such as droplets and aerosols are more easily spread during conversations. In such environments, plasma air purification equipment cannot achieve a concentrated and effective purification effect. Summary of the Invention
[0004] Therefore, it is necessary to provide an electric purification device and air curtain machine that can achieve a centralized and good purification effect in this location, addressing the problem that plasma air purification equipment in related technologies cannot achieve a centralized and good purification effect.
[0005] In a first aspect, an electro-purification device is provided, comprising:
[0006] The discharge assembly includes at least one discharge unit, each discharge unit including multiple linear corona discharge electrodes and a ring ground electrode, all of which are fixedly arranged. All corona discharge electrodes and the ring ground electrode are arranged opposite to each other along a first direction, and all corona discharge electrodes are arranged radially toward the side closer to the ring ground electrode; and an insulating back corona element is arranged along the first direction on the side of the ring ground electrode away from the corona discharge electrodes.
[0007] The aforementioned electro-purification device, by arranging all corona discharge electrodes radially towards the side closest to the annular grounding electrode, not only increases the corona discharge area but also forms a cone-shaped electric field region, making the corona discharge area compact. Therefore, it can concentrate and quickly treat pathogens such as smoke, odors, droplets, and aerosols in enclosed spaces. In addition, by setting up an insulating back corona component to generate back corona discharge, it can achieve even better purification effects.
[0008] In one embodiment, the corona discharge electrode is a carbon fiber corona discharge electrode.
[0009] In one embodiment, each discharge component includes multiple discharge units, and all discharge units of each discharge component are arranged in an array along a direction intersecting the first direction.
[0010] In one embodiment, the insulating back corona device includes a first insulating layer and a conductive layer stacked along a first direction, wherein the first insulating layer is disposed closer to the annular grounding electrode than the conductive layer.
[0011] The first insulating layer has multiple first protrusions formed on the side opposite to the conductive layer.
[0012] In one embodiment, the discharge assembly includes two sets of discharge assemblies arranged opposite each other along a first direction, and an insulating back corona element is disposed between the two sets of discharge assemblies.
[0013] In one embodiment, the electrodes of the two sets of discharge components have opposite polarities.
[0014] In one embodiment, the insulating back corona component includes a first insulating layer, a conductive layer and a second insulating layer stacked along a first direction, wherein the first insulating layer is disposed toward one of the discharge components and the second insulating layer is disposed toward the other discharge component.
[0015] The first insulating layer has a plurality of first protrusions formed on the side opposite to the conductive layer; and / or
[0016] The second insulating layer has multiple second protrusions formed on the side opposite to the conductive layer.
[0017] In one embodiment, the resistance value between the first insulating layer and the second insulating layer is 10. 8 ~10 9 ohm.
[0018] Secondly, an air curtain machine is also provided, including the electro-purification device in any of the above embodiments.
[0019] In one embodiment, the air curtain machine includes a housing and a cross-flow or centrifugal fan, the cross-flow or centrifugal fan is disposed inside the housing, the housing has an air inlet, and an electro-purification device is disposed between the air inlet and the cross-flow or centrifugal fan along the airflow direction.
[0020] The aforementioned electro-purification device and air curtain machine, by arranging all corona discharge electrodes radially towards the ring-shaped grounding electrode, not only increase the corona discharge area but also form a cone-shaped electric field region. This compact corona discharge area allows for concentrated and rapid treatment of pathogens such as smoke, odors, droplets, and aerosols in enclosed spaces. Furthermore, the inclusion of an insulating back-corona component generates back-corona discharge, resulting in even better purification. Moreover, by incorporating an electro-purification device on the air curtain machine, the high-speed air drawn in by the machine is purified, further enhancing the isolation effect of the air curtain. Attached Figure Description
[0021] Figure 1This is a schematic diagram of an electro-purification device in one or more embodiments of this application.
[0022] Figure 2 This is a schematic diagram of the structure of an electro-purification device in one or more embodiments of this application.
[0023] Figure 3 This is a schematic diagram of the structure of a discharge unit in one or more embodiments of this application.
[0024] Figure 4 This is a schematic diagram of the structure of the discharge component in one or more embodiments of this application.
[0025] Figure 5 This is a schematic diagram of the structure of an air curtain machine in one or more embodiments of this application.
[0026] Explanation of reference numerals in the attached figures:
[0027] The device includes an electric purification unit 100, a discharge assembly 10, a discharge unit 11, a corona discharge electrode 111, a ring grounding electrode 112, an insulating back corona component 20, a first insulating layer 21, a first protrusion 211, a conductive layer 22, a second insulating layer 23, a second protrusion 231, an air curtain 200, a housing 210, a cross-flow or centrifugal fan 220, and an air inlet 230. Detailed Implementation
[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0034] See Figure 1 , Figure 1 A schematic diagram of an electro-purification device according to an embodiment of this application is shown. Figure 2 A schematic diagram of the structure of an electro-purification device according to an embodiment of this application is shown. The electro-purification device provided in one embodiment of this application includes a discharge assembly 10 and an insulating back corona component 20.
[0035] The discharge component 10 can be understood as a component capable of polarizing and charging dust particles in the air. Specifically, when a voltage is applied to the discharge component 10, the nearby air molecules are polarized (ionized), and the polarized charged particles attach to the dust particles flowing through the air, causing the dust particles to become charged. The charged dust particles then move towards the low-potential metal dust collection electrode under the influence of the electric field, and eventually fall onto its surface, thus achieving the purpose of purifying the air.
[0036] Specifically, the discharge assembly 10 includes at least one discharge unit 11. Each discharge unit 11 includes multiple linear corona discharge electrodes 111 and an annular grounding electrode 112, all of which are fixedly arranged. All the corona discharge electrodes 111 and the annular grounding electrode 112 are arranged opposite to each other along a first direction, and all the corona discharge electrodes 111 are arranged radially toward the side closer to the annular grounding electrode 112.
[0037] Specifically, the first direction is Figure 1 The horizontal direction X is shown.
[0038] The corona discharge electrode 111 can be loaded with either a positive or negative high voltage. After voltage is applied to the corona discharge electrode 111, discharge will occur through its tip, thereby ionizing the nearby air and generating a corona discharge. The ring grounding electrode 112 should be grounded. After the corona discharge occurs, the charged dust particles will move towards the low-potential ring grounding electrode 112 under the influence of the electric field, and thus fall onto the surface of the ring grounding electrode 112.
[0039] The radial arrangement of all corona discharge electrodes 111 towards the ring ground electrode 112 means that all corona discharge electrodes 111 are clustered at the end away from the ring ground electrode 112, for example, bound together, or not bound together but close to each other, and spread out in an umbrella shape at the end near the ring ground electrode 112. Specifically, the end of each corona discharge electrode 111 near the ring ground electrode 112 points towards the ring ground electrode 112, and the center of convergence of all corona discharge electrodes 111 at the end away from the ring ground electrode 112 coincides with the center line of the ring ground electrode 112. In this way, the electric field distribution can be made uniform.
[0040] When all the corona discharge electrodes 111 are arranged radially toward the side near the annular grounding electrode 112, there are gaps between each corona discharge electrode 111. The corona discharge electrodes 111 will repel each other because they are charged with the same polarity. Since all the corona discharge electrodes 111 are arranged radially toward the side near the annular grounding electrode 112, the area of corona discharge can be increased.
[0041] All corona discharge electrodes 111 and annular grounding electrodes 112 can be fixedly installed in an external installation environment, such as on the housing 210 of the air curtain machine 200 described later. Alternatively, a fixing frame can be provided on the electro-purification device 100 of this application embodiment to fix all corona discharge electrodes 111 and annular grounding electrodes 112, thereby maintaining their relative fixed positions.
[0042] The insulating back corona component 20 refers to a component capable of generating back corona discharge. Specifically, when dust particles charged by the discharge component 10 accumulate on the insulating surface of the insulating back corona component 20, a back electric field is formed on the insulating surface of the insulating back corona component 20. This electric field becomes stronger as the charge accumulates. When the charge accumulates to an intensity sufficient to ionize the nearby air, a back corona discharge will occur, thereby continuously purifying the air.
[0043] Therefore, the electro-purification device 100 of this application embodiment, by arranging all corona discharge electrodes 111 radially toward the side near the annular grounding electrode 112, not only increases the area of corona discharge but also forms a cone-shaped electric field region (e.g., Figure 3 The dotted area shown makes the corona discharge area compact, thus enabling concentrated and rapid treatment of pathogens such as smoke, odors, droplets, and aerosols in enclosed spaces. In addition, by setting up an insulating back corona component 20 to generate back corona discharge, it can achieve better purification effect.
[0044] See Figure 2 and Figure 3 Specifically, in the embodiments of this application, the corona discharge electrode 111 is a carbon fiber corona discharge electrode.
[0045] Carbon fiber corona discharge electrode refers to a corona discharge electrode made of carbon fiber.
[0046] Carbon fiber corona discharge electrodes have a low field-induced effect and can generate corona discharge at low voltages.
[0047] In other embodiments, the corona discharge electrode 111 may also be a tungsten wire corona discharge electrode or a corona discharge electrode made of other metal materials, and there is no specific limitation.
[0048] See Figure 4 In some embodiments, each discharge component 10 includes a plurality of discharge units 11, and all discharge units 11 of each discharge component 10 are arranged in an array along the direction in which they intersect in the first direction.
[0049] Specifically, the direction intersecting the first direction may include, for example: Figure 1 The vertical direction Z shown can also include, for example, Figure 1The direction Y is perpendicular to the plane of the paper. In the embodiments of this application, all discharge units 11 of each discharge component 10 are arranged in an array along the Z and Y directions.
[0050] By arranging all the discharge units 11 of each discharge component 10 in an array along the direction of intersection of the first direction, the purification area can be increased on the one hand, and the blank area between each discharge unit 11 is reduced on the other hand, so that more charge is generated by the corona discharge of the discharge unit 11, thereby improving the purification efficiency.
[0051] Specifically, all discharge units 11 of each discharge assembly 10 are arranged in 4 rows along the Y direction and in 7 rows along the Z direction. It should be noted that the arrangement and number of all discharge units 11 of the discharge assembly 10 can be adaptively adjusted according to the air intake area of the air purification equipment, thereby improving the purification efficiency.
[0052] Please refer to it again. Figure 2 In some embodiments, the insulating back corona component 20 includes a first insulating layer 21 and a conductive layer 22 stacked along a first direction, wherein the first insulating layer 21 is disposed closer to the annular grounding electrode 112 than the conductive layer 22.
[0053] By setting the conductive layer 22 and the first insulating layer 21, conductivity can be formed, causing the charged dust particles of the discharge assembly 10 to move toward the insulating back corona component 20, thereby causing the charged dust particles to accumulate on the surface of the first insulating layer 21. Because the first insulating layer 21 has a high resistance, it cannot conduct away all the charge in time, and a reverse electric field will be formed between the corona discharge electrode 111 of the discharge unit 11 and the conductive layer 22, thereby generating a back corona discharge.
[0054] Specifically, the conductive layer 22 is also a low-potential metal layer, and the conductive layer 22 can be grounded.
[0055] In order to exacerbate the uneven discharge between the corona discharge electrode 111 of the discharge unit 11 and the conductive layer 22, and reliably generate back corona discharge to improve the purification effect, the first insulating layer 21 further forms a plurality of first protrusions 211 on the side away from the conductive layer 22.
[0056] Multiple first protrusions 211 can form multiple discharge tips, thereby ionizing the nearby air and generating independent back corona fields.
[0057] Specifically, the first protrusion 211 may be conical, needle-shaped, or the like.
[0058] In the embodiments of this application, the discharge assembly 10 includes two sets, which are arranged opposite to each other along a first direction, and the insulating back corona member 20 is disposed between the two sets of discharge assemblies 10.
[0059] In this way, the space on both sides of the insulating anti-corona component 20 can be utilized to achieve simultaneous purification on both sides, thereby improving the purification efficiency.
[0060] Optionally, the two sets of discharge components 10 are arranged symmetrically relative to the insulating back corona component 20.
[0061] Furthermore, the electrode polarities between the two sets of discharge components 10 are opposite.
[0062] Opposite electrode polarity means that one discharge component 10 is loaded with a positive high voltage, while the other discharge component 10 is loaded with a negative high voltage, which can respectively excite positive polarity particles and negative polarity particles to combine with dust particles in the air.
[0063] By setting the electrodes of the two sets of discharge components 10 to have opposite polarities, positively charged dust particles and negatively charged dust particles can be obtained. The positively charged dust particles and negatively charged dust particles will electrocoagulate on the insulating back corona component 20, thereby combining and settling on the insulating back corona component 20, ensuring that pollutants are fully collected and improving the purification effect.
[0064] In some embodiments, the insulating back corona component 20 includes a first insulating layer 21, a conductive layer 22 and a second insulating layer 23 stacked along a first direction. The first insulating layer 21 is disposed toward the annular grounding electrode 112 of one of the discharge components 10, and the second insulating layer 23 is disposed toward the annular grounding electrode 112 of the other discharge component 10.
[0065] Thus, the charged dust particles from one discharge component 10 move towards the first insulating layer 21 of the insulating back corona component 20, causing the charged dust particles to accumulate on the surface of the first insulating layer 21. Meanwhile, the charged dust particles from the other discharge component 10 move towards the second insulating layer 23 of the insulating back corona component 20, causing the charged dust particles to accumulate on the surface of the second insulating layer 23. Because both the first insulating layer 21 and the second insulating layer 23 have high resistance and cannot conduct away all the charge in time, a reverse electric field is formed between the corona discharge electrode 111 of the corresponding discharge unit 11 and the conductive layer 22, thereby generating back corona discharge.
[0066] Specifically, the insulating anti-corona component 20 is a composite plate formed by combining a first insulating layer 21, a conductive layer 22 and a second insulating layer 23.
[0067] To exacerbate the uneven discharge between the corona discharge electrode 111 and the conductive layer 22 in the discharge unit 11, and reliably generate back corona discharge to improve the purification effect, the first insulating layer 21 further forms a plurality of first protrusions 211 on the side opposite to the conductive layer 22. Similarly, the second insulating layer 23 may also have a plurality of second protrusions 231 on the side opposite to the conductive layer 22. It should be noted that the protrusions of the first insulating layer 21 and the second insulating layer 23 may be provided simultaneously, or only one of them may be provided.
[0068] Multiple first protrusions 211 and multiple second protrusions 231 can form multiple discharge tips, thereby ionizing the nearby air and generating independent back corona fields.
[0069] Specifically, the first protrusion 211 and the second protrusion 231 may be conical, needle-shaped, or the like.
[0070] In the embodiments of this application, the resistance value of the first insulating layer 21 and the second insulating layer 23 is 10. 8 ~10 9 ohm.
[0071] Research has shown that by setting the resistance of the first insulating layer 21 and the second insulating layer 23 to 10... 8 ~10 9 The ohm effectively creates a reverse electric field between the corona discharge electrode 111 of the discharge unit 11 and the conductive layer 22, thereby generating a reverse corona discharge.
[0072] Combination Figure 2 and Figure 5 Based on the same inventive concept, this application also provides an air curtain machine 200, including the electro-purification device 100 in any of the above embodiments.
[0073] The air curtain machine 200 refers to a machine that uses a high-speed motor to drive a cross-flow or centrifugal fan to generate a powerful airflow, forming an "invisible curtain," or air curtain. This air curtain forms an air isolation layer, which can reduce the spread of droplets and aerosol germs during conversations in small meeting spaces. It can also block the spread of some odors, creating a healthy and comfortable working environment.
[0074] Therefore, by installing an electro-purification device 100 on the air curtain machine 200, the high-speed air drawn in by the air curtain machine 200 can be purified, thereby enabling the formed air curtain to achieve a better isolation effect.
[0075] Specifically, the air curtain machine 200 includes a housing 210 and a cross-flow or centrifugal fan 220. The cross-flow or centrifugal fan 220 is located inside the housing 210. The housing 210 has an air inlet 230. Along the airflow direction, the electro-purification device 100 is located between the air inlet 230 and the cross-flow or centrifugal fan 220.
[0076] Thus, when the air curtain machine 200 is turned on and the cross-flow or centrifugal fan 220 is running, it will generate a suction force to draw air into the housing 210 from the air inlet 230. At this time, since the electric purification device 100 is located between the air inlet 230 and the cross-flow or centrifugal fan 220, it can purify the air.
[0077] More specifically, the corona discharge electrode 111 of the discharge component 10 of the electro-purification device 100 is fixed at the air inlet 230, and the annular grounding electrode 112 is located on the inner side of the corona discharge electrode 111 away from the air inlet 230.
[0078] When the discharge assembly 10 includes multiple discharge units 11, the corona discharge electrodes 111 of the multiple discharge units 11 are arranged at the air inlet 230 so that the air inlet 230 is completely covered by the electric field range formed by the discharge assembly 10, which increases the interaction between the air entering from the air inlet 230 and the electric field component, thereby improving the purification effect.
[0079] In some embodiments, an insulating grille is provided at the air inlet 230, and the corona discharge electrode 111 is fixed at the insulating grille.
[0080] In this way, without affecting the air intake of the air inlet 230, the corona discharge electrode 111 can reliably and safely apply high voltage.
[0081] In the embodiments of this application, the housing 210 has two air inlets 230 arranged opposite to each other, and the discharge assembly 10 has two sets, with each discharge assembly 10 corresponding to an air inlet 230.
[0082] Thus, when air enters from the air inlets 230 on both sides, the two sets of discharge components 10 can simultaneously purify the air entering from both places, improving purification efficiency and purification effect.
[0083] In summary, the air curtain machine 200 and the electro-purification device 100 of the embodiments of this application can be compactly arranged within the air curtain machine 200, and can achieve good single-pass purification efficiency at high wind speeds. The energy of the back corona field can also effectively remove gaseous pollutants.
[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0085] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. An electro-purification device, characterized in that, include: The discharge assembly (10) includes at least one discharge unit (11), each discharge unit (11) including multiple linear corona discharge electrodes (111) and a ring-shaped ground electrode (112) fixedly arranged. All the corona discharge electrodes (111) and the ring-shaped ground electrode (112) are arranged opposite to each other along a first direction, and all the corona discharge electrodes (111) are arranged radially toward the side closer to the ring-shaped ground electrode (112); and An insulating anti-corona component (20) is disposed along the first direction on the side of the annular grounding electrode (112) facing away from the corona discharge electrode (111). The insulating anti-corona component (20) has a first insulating layer (21) and a conductive layer (22) stacked along the first direction. The first insulating layer (21) is disposed closer to the annular grounding electrode (112) than the conductive layer (22). The first insulating layer (21) has a plurality of first protrusions (211) formed on the side facing away from the conductive layer (22).
2. The electro-purification device according to claim 1, characterized in that, The corona discharge electrode (111) is a carbon fiber corona discharge electrode (111).
3. The electro-purification device according to claim 1, characterized in that, Each of the discharge components (10) includes a plurality of discharge units (11), and all of the discharge units (11) of each discharge component (10) are arranged in an array along a direction intersecting the first direction.
4. The electro-purification device according to claim 1, characterized in that, The discharge assembly (10) includes two sets, which are arranged opposite to each other along the first direction, and the insulating anti-corona component (20) is disposed between the two sets of discharge assemblies (10). The first insulating layer (21) is disposed toward one of the discharge components (10).
5. The electro-purification device according to claim 4, characterized in that, The electrodes of the two sets of discharge components (10) have opposite polarities.
6. The electro-purification device according to claim 4, characterized in that, The insulating anti-corona component (20) further includes a second insulating layer (23), wherein the first insulating layer (21), the conductive layer (22) and the second insulating layer (23) are stacked along the first direction; the second insulating layer (23) is disposed toward the other discharge component (10); The second insulating layer (23) has a plurality of second protrusions (231) formed on the side opposite to the conductive layer (22).
7. The electro-purification device according to claim 6, characterized in that, The resistance of the first insulating layer (21) and the second insulating layer (23) is 10. 8 ~10 9 ohm.
8. The electro-purification device according to claim 6, characterized in that, The first protrusion (211) is conical or needle-shaped; and / or The second protrusion (231) is conical or needle-shaped.
9. An air curtain machine, characterized in that, Includes the electro-purification device (100) as described in any one of claims 1 to 8.
10. The air curtain machine according to claim 9, characterized in that, The air curtain machine includes a housing (210) and a cross-flow or centrifugal fan (220). The cross-flow or centrifugal fan (220) is located inside the housing (210). The housing (210) has an air inlet (230). Along the airflow direction, the electro-purification device (100) is located between the air inlet (230) and the cross-flow or centrifugal fan (220).