Air purification device

Abstract

The present invention relates to the field of air purification technology, and discloses an air purification device, comprising: a housing having an air inlet and an air outlet; a filter in the shape of a cylinder; a main fan, which allows air to enter from the air inlet during operation, pass through the filter, and be discharged from the air outlet; a chassis, which is arranged at the bottom of the filter; a sterilization and deodorization module, which is installed on the chassis and located on the inner side of the filter, and comprises: a shell, which has an air inlet and an air outlet, and an air duct connecting the air inlet and the air outlet is formed inside the shell; a plasma module, which is arranged in the air duct; a fan, which is arranged in the air duct; and a sterilization module, which is arranged in the shell. In the present invention, when the fan is working, odor molecules in the space and on the filter enter the shell through the air inlet of the shell, and pass through the discharge area of ​​the plasma module, which can effectively remove odors and protect human health. By arranging the sterilization module in the shell, the sterilization module can sterilize the filter.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification, and in particular to an air purification device. Background Art

[0002] With the continuous development of the pet economy, an increasing number of pet products have emerged on the market, including pet purifiers. The primary purpose of pet purifiers is to help reduce pet hair, dander, and odor in the home, thereby improving indoor air quality. The filter, a core component of a pet purifier, is often located at the bottom of the product or below the air duct, midway between the air inlet and outlet. It effectively intercepts dust and bacteria in the air and discharges clean air through the outlet. During long-term use, especially in households with pets, the environment is prone to the presence of microorganisms and bacteria. Dust and bacteria adhere to the filter surface for a long time, breeding microorganisms such as bacteria and mold over time. These microorganisms produce odors as they decompose organic matter carried in the air. These odor molecules can be blown out of the air purifier outlet through the air duct during use, causing user discomfort and endangering human health. Summary of the Invention

[0003] In view of this, the present invention provides an air purification device to solve the problem of filter odor.

[0004] The present invention provides an air purification device, comprising:

[0005] The housing has an air inlet and an air outlet;

[0006] The filter is cylindrical;

[0007] The main fan, when working, allows air to enter from the air inlet, pass through the filter, and be discharged from the air outlet;

[0008] A chassis, disposed at the bottom of the filter;

[0009] A sterilization and deodorization module is installed on the chassis and located inside the filter, comprising:

[0010] A housing having an air inlet and an air outlet, wherein an air duct connecting the air inlet and the air outlet is formed inside the housing;

[0011] A plasma module is provided in the air duct;

[0012] a fan, arranged in the air duct;

[0013] The sterilization module is arranged in the shell.

[0014] Beneficial effects: The plasma module can generate a large amount of plasma. Plasma is a highly ionized gas containing a large amount of active substances, such as free radicals (OH·, O·), ozone (O 3） These active particles, such as hydrogen peroxide (H2O2), possess strong oxidizing properties and react with odor molecules, breaking them down into harmless small molecules such as water and carbon dioxide. When the fan is operating, odor molecules in the air and on the filter enter the housing through the air inlet. They then pass through the plasma module's discharge area, effectively removing odor and protecting human health. Furthermore, the plasma generated by the plasma module, driven by the fan, flows out of the air outlet and onto the inner surface of the filter, removing odors. The fan circulates air within the filter, enhancing odor removal effectiveness. A sterilization module is incorporated into the housing to sterilize the filter. This sterilization and odor removal module prevents odor and bacteria from accumulating on the filter from posing a health risk. Integrating the plasma and sterilization modules within the housing reduces component count. This air purification device removes odors and sterilizes the filter and the air in the air.

[0015] In an optional embodiment, the sterilization module includes a plurality of UV lamps uniformly distributed along the circumference, and in the height direction, the centers of the UV lamps are adapted to be flush with the center of the filter.

[0016] Beneficial Effects: The sterilization module includes multiple UV lamps evenly distributed along the circumference. The UV lamps emit UV light that can irradiate the inner surface of the filter. The multiple UV lamps provide comprehensive sterilization coverage of the filter's inner surface. The center of the UV lamp is aligned with the center of the filter, ensuring comprehensive sterilization coverage of the filter's inner surface.

[0017] In an optional embodiment, the UV lamp is installed inside the housing, and the housing is provided with a light-transmitting portion for light to pass through.

[0018] Beneficial effect: By installing the UV lamp inside the shell and the plasma module inside the shell, the sterilization module and the plasma module can be integrated into the shell, reducing the number of parts, and the shell can also protect the UV lamp.

[0019] In an optional embodiment, the shell includes a lower cavity, a middle cavity and an upper cavity, the side wall of the lower cavity is provided with the air inlet, the fan is provided in the lower cavity, the plasma module is provided in the middle cavity, and the UV lamp is provided in the upper cavity.

[0020] Beneficial Effects: The fan is located in the lower chamber. It draws odor molecules from the air and on the filter through the housing's air inlet into the lower chamber. The air then flows upward into the upper chamber, passing through the plasma module's discharge area. This effectively removes odors and protects human health. By placing the UV lamp in the upper chamber, the UV lamp's height can be positioned at or near the midpoint of the filter, achieving all-around sterilization.

[0021] In an optional embodiment, the UV lamp is arranged on the inner wall of the upper cavity, and the upper cavity is provided with a light-transmitting portion.

[0022] Beneficial effect: The UV lamp is located on the inner wall of the upper cavity, so the light emitted is closer to the filter, thereby achieving all-round sterilization.

[0023] In an optional embodiment, the UV lamp is limited by a first buckle and / or ribs.

[0024] Beneficial effect: The UV lamp is limited by the first buckle and / or the rib, and no screws are required, which makes it easier to install the UV lamp.

[0025] In an optional embodiment, in a cross section along the first direction, the width of the lower cavity is greater than the width of the upper cavity, and the width of the upper cavity is greater than the width of the middle cavity.

[0026] Beneficial Effects: Because the width of the upper and middle cavities is smaller than that of the lower cavity, when the sterilization and deodorization module is installed inside the filter, it can reduce the resistance to air flow during operation of the air purification device. Because the width of the upper cavity is greater than that of the middle cavity, the UV lamp can be relatively closer to the inner surface of the filter, ensuring the sterilization effect on the inner surface of the filter. In addition, the smaller width of the middle cavity can increase the air flow rate out of the air outlet.

[0027] In an optional embodiment, the air outlet is provided on a side wall of the middle cavity, and a barrier structure is provided between the middle cavity and the upper cavity.

[0028] Beneficial effects: A barrier structure is provided between the middle cavity and the upper cavity, which can ensure that the airflow flows out from the air outlet after being purified by the plasma module and will not flow to the sterilization module, and can ensure that the plasma generated by the plasma module flows out from the air outlet and flows to the inner surface of the filter to remove odors from the filter.

[0029] In an optional embodiment, a volute is provided in the air duct, the fan is provided in the volute, and the plasma module is provided at the air outlet end of the volute.

[0030] Beneficial Effects: The fan is housed within the volute, and the plasma module is located at the outlet end of the volute. When the fan is operating, odor molecules in the air and on the filter enter the volute through the air inlet of the housing. After exiting the volute, they pass through the plasma module, effectively removing odors and protecting human health. The plasma module, located at the outlet end of the volute, ensures that air flows through the plasma module, ensuring effective odor removal.

[0031] In an optional embodiment, the shell includes a left half shell and a right half shell, and the left half shell and the right half shell are butt-jointed.

[0032] Beneficial effect: The shell comprises a left half shell and a right half shell, which facilitates installation of the sterilization module, the plasma module and the blower inside the shell.

[0033] In an optional embodiment, the bottom of the shell is connected to the chassis via screws and a second buckle.

[0034] Beneficial effect: Since the bottom of the shell and the chassis are connected by screws and the second buckle, when fixing the sterilization and deodorization module, the bottom of the shell and the chassis can be connected by the second buckle first, and then the entire air purification device can be turned over and the screws can be tightened from the chassis. The second buckle can prevent the sterilization and deodorization module from falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 is a cross-sectional view of a sterilization and deodorization module according to an embodiment of the present invention;

[0037] Figure 2 is a cross-sectional view of a sterilization and deodorization module according to an embodiment of the present invention taken along a first direction;

[0038] Figure 3 is a cross-sectional view of a sterilization and deodorization module according to an embodiment of the present invention taken along a second direction;

[0039] Figure 4 for Figure 2 Schematic diagram of the structure of the middle left half shell;

[0040] Figure 5 for Figure 2 Schematic diagram of the structure of the middle right half shell;

[0041] Figure 6is a cross-sectional view of an air purification device according to an embodiment of the present invention taken along a first direction;

[0042] Figure 7 is a cross-sectional view of an air purification device according to an embodiment of the present invention at a cross section along a second direction;

[0043] Figure 8 An exploded view of a portion of the structure of an air purification device according to an embodiment of the present invention;

[0044] Figure 9 A top cross-sectional view of an air purification device according to an embodiment of the present invention;

[0045] Figure 10 This is a cross-sectional view of a partial structure of an air purification device according to an embodiment of the present invention, taken along a first direction.

[0046] Description of reference numerals:

[0047] 1. Shell; 101. Left half shell; 102. Right half shell; 103. Air inlet; 104. Air outlet; 105. Lower cavity; 106. Middle cavity; 107. Upper cavity; 108. First buckle; 109. Limiting rib; 110. Barrier structure; 2. Plasma module; 3. Fan; 4. UV lamp; 5. Volute; 6. Filter; 7. Chassis; 8. Screw; 9. Second buckle. DETAILED DESCRIPTION

[0048] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] With the continuous development of the pet economy, an increasing number of pet products have emerged on the market, including pet purifiers. The primary purpose of pet purifiers is to help reduce pet hair, dander, and odor in the home, thereby improving indoor air quality. The filter, a core component of a pet purifier, is often located at the bottom of the product or below the air duct, midway between the air inlet and outlet. It effectively intercepts dust and bacteria in the air and discharges clean air through the outlet. During long-term use, especially in households with pets, the environment is prone to the presence of microorganisms and bacteria. Dust and bacteria adhere to the filter surface for a long time, breeding microorganisms such as bacteria and mold over time. These microorganisms produce odors as they decompose organic matter carried in the air. These odor molecules can be blown out of the air purifier outlet through the air duct during use, causing user discomfort and endangering human health.

[0053] The following combination Figures 1 to 10 , describing embodiments of the present invention.

[0054] According to an embodiment of the present invention, on the one hand, a sterilization and deodorization module is provided, which is suitable for installation on the inner side of the cylindrical filter 6 and includes a housing 1, a plasma module 2, a fan 3 and a sterilization module.

[0055] Among them, the shell 1 has an air inlet 103 and an air outlet 104, and an air duct connecting the air inlet 103 and the air outlet 104 is formed inside the shell 1; the plasma module 2 is arranged in the air duct; the fan 3 is arranged in the air duct; and the sterilization module is arranged in the shell 1.

[0056] In this embodiment, the plasma module 2 generates a large amount of plasma. Plasma is a highly ionized gas containing a large number of active substances, such as free radicals (OH·, O·), ozone (O3), and hydrogen peroxide (H2O2). These active particles have strong oxidizing properties and can react with odor molecules, breaking them down into harmless small molecules, such as water and carbon dioxide. When the fan 3 is operating, odor molecules in the air and on the filter 6 enter the housing 1 through the air inlet 103 of the housing 1. Passing through the discharge area of ​​the plasma module 2, they effectively remove odors and protect human health. Furthermore, the plasma generated by the plasma module 2 can also flow out of the air outlet 104 under the action of the fan 3 and onto the inner surface of the filter 6, thereby removing odors from the filter 6. The fan 3 circulates air within the filter 6, enhancing the odor removal effect. By providing a sterilization module within the housing 1, the sterilization module can sterilize the filter 6. The sterilization and deodorization module can prevent the odor and bacteria in the filter 6 from harming human health, and the plasma module 2 and the sterilization module are integrated into one through the housing 1, which can reduce the number of parts.

[0057] In one embodiment, the sterilization module includes a plurality of UV lamps 4 evenly distributed along the circumference, and in the height direction, the center of the UV lamp 4 is adapted to be flush with the center of the filter 6 .

[0058] In this embodiment, the sterilization module includes multiple UV lamps 4 evenly distributed along the circumference. The UV lamps 4 emit UV light that can irradiate the inner surface of the filter 6. The arrangement of multiple UV lamps 4 can irradiate and sterilize the inner surface of the filter 6 in all directions. In the vertical direction, the center of the UV lamp 4 is aligned with the center of the filter 6, ensuring that the inner surface of the filter 6 is irradiated and sterilized in all directions.

[0059] Specifically in one embodiment, a total of four UV lamps 4 are provided, with one UV lamp 4 arranged at intervals of 90° along the circumferential direction.

[0060] In an alternative embodiment, five or more UV lamps 4 may be provided.

[0061] The irradiation range of each UV lamp 4 can be 120° in the height direction and the circumferential direction, so that the inner surface of the filter 6 can be irradiated and sterilized in all directions.

[0062] Specific as Figure 10 As shown, in the height direction, the irradiation range of the UV lamp 4 is 120°, which can cover the upper and lower ends of the filter 6, thereby ensuring that the inner surface of the filter 6 is irradiated and sterilized in all directions in the height direction.

[0063] In one embodiment, the UV lamp 4 is installed inside the housing 1 , and the housing 1 is provided with a light-transmitting portion for the light to pass through.

[0064] In this embodiment, by installing the UV lamp 4 inside the shell 1 and the plasma module 2 inside the shell 1, the sterilization module and the plasma module 2 can be integrated into the shell 1, reducing the number of parts, and the shell 1 can also protect the UV lamp 4.

[0065] Specifically in one embodiment, the housing 1 is actually a lamp holder for mounting the UV lamp 4 , and the plasma module 2 is mounted using the space inside the lamp holder, thereby reducing the number of parts.

[0066] In an embodiment not shown in the drawings, it is conceivable to install the UV lamp 4 on the outer periphery of the housing 1 .

[0067] In one embodiment, Figure 2 As shown, the shell 1 includes a lower cavity 105, a middle cavity 106 and an upper cavity 107. The side wall of the lower cavity 105 is provided with an air inlet 103, the fan 3 is provided in the lower cavity 105, the plasma module 2 is provided in the middle cavity 106, and the UV lamp 4 is provided in the upper cavity 107.

[0068] In this embodiment, the fan 3 is located in the lower chamber 105. When the fan 3 is in operation, it draws odor molecules from the air and on the filter 6 into the lower chamber 105 through the air inlet 103 of the housing 1. The molecules then flow upward into the middle chamber 106 and pass through the discharge area of ​​the plasma module 2, effectively removing odors and protecting human health. By placing the UV lamp 4 in the upper chamber 107, the UV lamp 4 can be positioned at or near the midpoint of the filter 6 in the height direction, achieving all-round sterilization.

[0069] In one embodiment, the UV lamp 4 is disposed on the inner wall of the upper cavity 107 , and the upper cavity 107 is provided with a light-transmitting portion.

[0070] In this embodiment, the UV lamp 4 is disposed on the inner wall of the upper cavity 107 , so that the emitted light is closer to the filter 6 , thereby achieving all-round sterilization.

[0071] In one embodiment, the UV lamp 4 is limited by buckles and / or ribs.

[0072] In this embodiment, the UV lamp 4 is limited by buckles and / or ribs, without the need for screws, which makes it easier to install the UV lamp 4.

[0073] Specifically in one embodiment, Figure 3 As shown, the UV lamp 4 is provided with a supporting rib on the left side, two supporting ribs on the right side, a first buckle 108 on the right side, and an L-shaped supporting rib at the upper left corner. The UV lamp 4 is limited by the supporting rib and the first buckle 108.

[0074] Specifically in one embodiment, Figure 4As shown, two supporting ribs are provided on the left and right sides of the UV lamp 4. The UV lamp 4 is limited by the supporting ribs on the left and right sides, and the supporting ribs on the left and right sides press the UV lamp 4 tightly.

[0075] In an embodiment not shown in the figures, the UV lamp 4 may be provided with first buckles 108 on the left and right sides and the bottom side, and the first buckles 108 are used for position limiting.

[0076] In one embodiment, in a cross section along the first direction, the width of the lower cavity 105 is greater than the width of the upper cavity 107 , and the width of the upper cavity 107 is greater than the width of the middle cavity 106 .

[0077] In this embodiment, because the widths of upper cavity 107 and middle cavity 106 are smaller than the width of lower cavity 105, when the sterilization and deodorization module is installed inside filter 6, the resistance to air flow during operation of the air purification device can be reduced. Since the width of upper cavity 107 is greater than that of middle cavity 106, UV lamp 4 can be placed relatively closer to the inner surface of filter 6, ensuring a sterilization effect on the inner surface of filter 6. Furthermore, the smaller width of middle cavity 106 can increase the air flow rate out of air outlet 104.

[0078] It should be noted that the cross section in the first direction refers to the plane where the longitudinal cross section of the fan 3 is located.

[0079] Specifically in one embodiment, Figure 3 As shown, in the cross section along the second direction, the width of the lower section of the middle cavity 106 is consistent with the width of the lower cavity 105, and the width of the upper section of the middle cavity 106 gradually decreases from bottom to top.

[0080] The cross section in the second direction specifically refers to the plane where the cross section of the fan 3 is located.

[0081] In one embodiment, the air outlet 104 is disposed on a side wall of the middle cavity 106 , and a barrier structure 110 is disposed between the middle cavity 106 and the upper cavity 107 .

[0082] In this embodiment, a barrier structure 110 is provided between the middle cavity 106 and the upper cavity 107, which can ensure that the airflow flows out from the air outlet 104 after being purified by the plasma module 2 and will not flow to the sterilization module, and can ensure that the plasma generated by the plasma module 2 flows out from the air outlet 104 and flows to the inner surface of the filter 6 to remove odors from the filter 6.

[0083] In this embodiment, a volute 5 is provided in the air duct, the fan 3 is provided in the volute 5 , and the plasma module 2 is provided at the air outlet end of the volute 5 .

[0084] In this embodiment, the fan 3 is disposed within the volute 5, and the plasma module 2 is located at the outlet end of the volute 5. When the fan 3 is operating, odor molecules in the air and on the filter 6 enter the volute 5 through the air inlet 103 of the housing 1. After flowing out of the volute 5, they pass through the plasma module 2, effectively removing odors and protecting human health. The plasma module 2 is located at the outlet end of the volute 5 to ensure that air flows through the plasma module 2, ensuring effective odor removal.

[0085] In one embodiment, the housing 1 includes a left half shell 101 and a right half shell 102 , and the left half shell 101 and the right half shell 102 are butted against each other.

[0086] In this embodiment, the housing 1 includes a left half shell 101 and a right half shell 102 , which facilitates the installation of the sterilization module, the plasma module 2 and the blower 3 inside the housing 1 .

[0087] Specifically in one embodiment, the left half shell 101 and the right half shell 102 have substantially the same or symmetrical shapes.

[0088] It should be noted that the left half shell 101 and the right half shell 102 can be connected together in any manner.

[0089] According to an embodiment of the present invention, on the other hand, an air purification device is also provided, including a filter 6, a chassis 7 and the sterilization and deodorization module provided in the above embodiment.

[0090] The filter screen 6 is cylindrical; the chassis 7 is arranged at the bottom of the filter screen 6; the sterilization and deodorization module is installed on the chassis 7 and is located on the inner side of the filter screen 6.

[0091] In this embodiment, the plasma module 2 generates a large amount of plasma. Plasma is a highly ionized gas containing a large number of active substances, such as free radicals (OH·, O·), ozone (O3), and hydrogen peroxide (H2O2). These active particles have strong oxidizing properties and can react with odor molecules, breaking them down into harmless small molecules, such as water and carbon dioxide. When the fan 3 is operating, odor molecules in the air and on the filter 6 enter the housing 1 through the air inlet 103 of the housing 1. Passing through the discharge area of ​​the plasma module 2, odors are effectively removed, protecting human health. Furthermore, the plasma generated by the plasma module 2 can also flow out of the air outlet 104 under the action of the fan 3 and onto the inner surface of the filter 6, thereby removing odors from the filter 6. The fan 3 circulates air within the filter 6, enhancing the odor removal effect. By installing a sterilization module in the housing 1, the sterilization module can sterilize the filter 6. Therefore, this air purification device can remove odors and sterilize the filter 6 and the air in the air.

[0092] It should be noted that the air purification device has the functions of a conventional air purifier, including a main fan of a conventional air purifier. When the main fan is working, air can enter from the air inlet of the shell of the air purification device, pass through the filter 6, and finally be discharged from the air outlet of the shell.

[0093] It should be noted that when the filter 6 is removed from the odor alone, the main fan may not be operated, and only the fan 3 may be operated to circulate the air inside the filter 6.

[0094] In one embodiment, the bottom of the housing 1 is connected to the chassis 7 via screws 8 and a second buckle 9 .

[0095] In this embodiment, since the bottom of the shell 1 is connected to the chassis 7 by screws 8 and the second clip 9, when fixing the sterilization and deodorization module, the bottom of the shell 1 and the chassis 7 can be connected by the second clip 9 first, and then the entire air purification device can be turned over and the screws 8 are tightened from the chassis 7. The second clip 9 can prevent the sterilization and deodorization module from falling.

[0096] Specifically in one embodiment, the bottom of the housing 1 and the chassis 7 can be connected by only one screw 8 and one second buckle 9 .

[0097] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by this application.

Claims

1. An air purification device, characterized in that: include: The housing has an air inlet and an air outlet; The filter (6) is cylindrical; The main fan, when in operation, allows air to enter from the air inlet, pass through the filter (6), and be discharged from the air outlet; A chassis (7) is provided at the bottom of the filter (6); A sterilization and deodorization module, which is installed on the chassis (7) and located inside the filter (6), and includes: A housing (1), the housing (1) having an air inlet (103) and an air outlet (104), and an air duct communicating with the air inlet (103) and the air outlet (104) is formed inside the housing (1); A plasma module (2) is provided in the air duct; A fan (3) is provided in the air duct; A sterilization module is provided in the housing (1), the sterilization module comprises a plurality of UV lamps (4) uniformly distributed along the circumference, the housing (1) comprises a lower cavity (105), an intermediate cavity (106) and an upper cavity (107), the side wall of the lower cavity (105) is provided with the air inlet (103), the fan (3) is provided in the lower cavity (105), the plasma module (2) is provided in the intermediate cavity (106), the UV lamp (4) is provided in the upper cavity (107), and the air outlet (104) is provided in the intermediate cavity (107). 6), a barrier structure (110) is provided between the middle cavity (106) and the upper cavity (107); a volute (5) is provided in the air duct, the fan (3) is provided in the volute (5), the plasma module (2) is provided at the air outlet end of the volute (5), and in a cross section along a first direction, the width of the lower cavity (105) is greater than the width of the upper cavity (107), and the width of the upper cavity (107) is greater than the width of the middle cavity (106), and the cross section in the first direction refers to the surface where the longitudinal cross section of the fan (3) is located.

2. The air purification device according to claim 1, characterized in that In the height direction, the center of the UV lamp (4) is adapted to be flush with the center of the filter (6).

3. The air purification device according to claim 2, characterized in that The UV lamp (4) is installed inside the housing (1), and the housing (1) is provided with a light-transmitting portion for light to pass through.

4. The air purification device according to claim 2 or 3, characterized in that: The UV lamp (4) is arranged on the inner wall of the upper cavity (107), and the upper cavity (107) is provided with a light-transmitting portion.

5. The air purification device according to claim 4, characterized in that: The UV lamp (4) is limited in position by a first buckle (108) and / or ribs.

6. The air purification device according to any one of claims 1 to 3, characterized in that: The housing (1) comprises a left half shell (101) and a right half shell (102), and the left half shell (101) and the right half shell (102) are butt-jointed.

7. The air purification device according to any one of claims 1 to 3, characterized in that: The bottom of the housing (1) is connected to the chassis (7) via screws (8) and a second buckle (9).

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