Paint mist collecting filter device

Abstract

This utility model relates to a paint mist collection and filtration device, including a mounting base, a gas collection hood, a filter box, and a connecting pipe. The filter box is mounted on the mounting base. The gas collection hood includes a hood body, a baffle portion, and a first filter drawer. The hood body is mounted on the mounting base. The baffle portion is connected to the hood body and extends into the hood body, dividing the interior of the hood body into a first groove and a second groove. The first groove is used to install a spray gun. The hood body has a hood opening on one side along a first direction. A first drawer opening communicating with the second groove is opened on the periphery of the hood body. The first filter drawer passes through the first drawer opening and is inserted into the second groove. The first filter drawer includes a first drawer frame and two first filter screens located on opposite sides of the first drawer frame. One first filter screen is adjacent to the hood opening, and the other first filter screen forms a gas collection groove between itself and the hood body. The connecting pipe communicates with the filter box and the gas collection groove. The filter box is connected to an external air extraction device. This utility model can improve the paint mist collection and filtration efficiency and facilitate cleaning and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of spraying technology, specifically to a paint mist collection and filtration device. Background Technology

[0002] The main painting processes for shipyard outer plating include: shop primer, anti-rust paint, intermediate coat, and final coat. The first few coats are completed before the ship enters the dry dock. The final coat, also called the final coat, is applied inside the dock. Shipyards use various painting methods, including brushing, rolling, spraying, and airless spraying. Airless spraying is particularly suitable for large-area applications such as ship outer plating due to its superior coating quality and high production efficiency; however, this method requires highly skilled workers. Currently, most shipyards use this method for large-area painting of ship outer plating.

[0003] Although airless spraying offers a high paint deposition rate, theoretically exceeding 70%, the actual efficiency is slightly lower due to worker operation and environmental factors. Paint droplets that fail to deposit on the hull plating escape into the air. Because paint is highly toxic, this poses a threat to the surrounding environment and worker health. Over time, the deposited paint mist volatilizes, producing VOCs that permeate the entire dock floor with an irritating odor, causing continuous adverse effects on worker health. Utility Model Content

[0004] The purpose of this invention is to provide a paint mist collection and filtration device that can improve the efficiency of paint mist collection and filtration, while also being easy to clean and maintain.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A paint mist collection and filtration device is provided, comprising a mounting base, a gas collection hood, a filter box, and a connecting pipe. The filter box is mounted on the mounting base. The gas collection hood includes a cover body, a baffle portion, and a first filter drawer. The cover body is mounted on the mounting base. The baffle portion is connected to the cover body and extends into the cover body. The baffle portion divides the interior of the cover body into a first groove and a second groove. The first groove is used to install a spray gun. The cover body has a hood opening on one side along a first direction. The openings of the first groove and the second groove are both directly opposite the hood opening. A first drawer opening communicating with the second groove is opened on the periphery of the cover body. The first filter drawer passes through the first drawer opening and is inserted into the second groove. The first filter drawer includes a first drawer frame and two first filter screens. The two first filter screens are located on opposite sides of the first drawer frame along the first direction. One first filter screen is adjacent to the hood opening, and the other first filter screen forms a gas collection groove between itself and the cover body along one side of the first direction. One end of the connecting pipe is connected to the filter box, and the other end is connected to the gas collection groove. The filter box is connected to an external air extraction device.

[0007] As a preferred embodiment of the paint mist collection and filtration device, the enclosure is arranged in a ring shape at the center of the hood, and the first filter drawer has a U-shaped structure. The hood also includes two sets of limiting support parts. The length of the hood extends along a second direction, and the width of the hood extends along a third direction. The opening of the first drawer is located on one side of the hood along the second direction. The two sets of limiting support parts are located on two opposing inner walls of the hood along the third direction. Each set of limiting support parts includes two limiting support bars, which are spaced apart along the first direction. The first filter drawer is inserted into the opening of the first drawer and located between the two limiting support bars. The first direction, the second direction, and the third direction are perpendicular to each other.

[0008] As a preferred embodiment of the paint mist collection and filtration device, the cover is provided with an exhaust port on each of its two sides along the third direction, the exhaust port is connected to the air collection groove, and each exhaust port is connected to a connecting pipe.

[0009] As a preferred embodiment of the paint mist collection and filtration device, the exhaust port is disposed adjacent to one side wall of the hood along the second direction, the hood is provided with a bottom plate facing the hood opening, the bottom plate is disposed at an inclination, and along the second direction, the distance between the end of the bottom plate adjacent to the exhaust port and the hood opening is greater than the distance between the end of the bottom plate away from the exhaust port and the hood opening.

[0010] As a preferred embodiment of the paint mist collection and filtration device, the first filter drawer further includes a first handle, which is disposed on one side of the first drawer frame along a second direction and is located outside the cover.

[0011] As a preferred embodiment of the paint mist collection and filtration device, the gas collection hood further includes a cover plate, which is installed at the hood opening. A first filter screen adjacent to the hood opening abuts against the cover plate. The cover plate has a plurality of first clearance holes facing the first filter screen and a second clearance hole facing the first groove.

[0012] As a preferred embodiment of the paint mist collection and filtration device, the filter box includes a box body and a second filter drawer. The box body is provided with a filter cavity and an air inlet and an air outlet communicating with the filter cavity. The air inlet is connected to the connecting pipe, and the air outlet is connected to an external air extraction device. The box body is also provided with a second drawer opening communicating with the filter cavity. The second filter drawer, which is inserted into the filter cavity through the second drawer opening, is located between the air inlet and the air outlet.

[0013] As a preferred embodiment of the paint mist collection and filtration device, there are multiple second filter drawers, which are spaced apart along the first direction. There are multiple second drawer openings, and each second drawer opening corresponds to a second filter drawer.

[0014] As a preferred embodiment of the paint mist collection and filtration device, the second filter drawer includes a second drawer frame and two second filters. The two second filters are located on opposite sides of the second drawer frame along the first direction, with one second filter facing the air extraction port and the other second filter adjacent to the air inlet.

[0015] As a preferred embodiment of the paint mist collection and filtration device, the second filter drawer further includes a second handle, which is disposed on one side of the second drawer frame along a second direction and is located outside the housing; the two air inlets are located on opposite sides of the housing along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0016] The beneficial effects of this utility model are:

[0017] This invention physically separates the spray gun working area (first groove) and the collection area (second groove) by designing a gas collection hood with a baffle. A negative pressure is created within the gas collection groove using an air extraction device, forcing the scattered paint mist to be directionally drawn into the second groove instead of spreading out, thus improving initial capture efficiency. The first filter drawer can be directly inserted or pulled out through the drawer opening on the side of the hood. When the paint mist passes through the two first filter screens, most of the paint residue is intercepted inside the drawer. Replacement is simple; just pull out the entire drawer for replacement, achieving quick and mess-free maintenance. This ensures that when the primary filter layer becomes saturated, the system's collection capacity can be restored in the shortest possible time. Simultaneously, the pre-filtered gas enters the subsequent filter box for fine filtration through a connecting pipe, reducing the burden on the downstream filter box, extending its service life, and ensuring the continuous and stable operation of the entire collection and filtration system. This utility model adopts a clever structural design of "gas collection hood partition" and "drawer-type filter", which combines the efficient capture of paint mist with the convenient maintenance of the filter components, thereby effectively solving the dual problems of difficult paint mist pollution control and low equipment maintenance efficiency in the painting industry. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the paint mist collection and filtration device in one embodiment;

[0019] Figure 2 This is an exploded view of the gas collection hood in one embodiment;

[0020] Figure 3 This is an assembly diagram of the cover and enclosure in one embodiment;

[0021] Figure 4 This is an exploded view of the filter box in one embodiment.

[0022] In the picture:

[0023] 100. Mounting base; 200. Gas collection hood; 210. Hood body; 2101. First groove; 2102. Second groove; 2103. Hood opening; 2104. First drawer opening; 2105. Exhaust port; 211. Hood bottom plate; 220. Enclosure part; 230. First filter drawer; 231. First drawer frame; 232. First filter screen; 233. First handle; 240. Limiting support part; 250. Cover plate; 2501. First clearance hole; 2502. Second clearance hole; 300. Filter box; 310. Box body; 3101. Air inlet; 3102. Air outlet; 3103. Second drawer opening; 320. Second filter drawer; 321. Second drawer frame; 322. Second filter screen; 323. Second handle; 400. Connecting pipe. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] like Figure 1 and Figure 2As shown, the paint mist collection and filtration device of this embodiment includes a mounting base 100, a gas collection hood 200, a filter box 300, and a connecting pipe 400. The filter box 300 is mounted on the mounting base 100. The gas collection hood 200 includes a cover body 210, a baffle portion 220, and a first filter drawer 230. The cover body 210 is mounted on the mounting base 100. The baffle portion 220 is connected to the cover body 210 and extends into the cover body 210. The baffle portion 220 divides the interior of the cover body 210 into a first groove 2101 and a second groove 2102. The first groove 2101 is used to install a spray gun. The cover body 210 has a hood opening 2103 on one side along a first direction. The openings of the first groove 2101 and the second groove 2102 are directly opposite the hood opening 2103. The circumference of the cover body 210 is open. A first drawer opening 2104 is provided, which communicates with the second groove 2102. A first filter drawer 230 is inserted into the second groove 2102 through the first drawer opening 2104. The first filter drawer 230 includes a first drawer frame 231 and two first filters 232. The two first filters 232 are located on opposite sides of the first drawer frame 231 along a first direction (X direction in the figure). One of the first filters 232 is adjacent to the cover opening 2103, and the other first filter 232 forms an air collection groove between itself and the cover body 210 on one side along the first direction (the side opposite to the first filter 232 adjacent to the cover opening 2103). One end of the connecting pipe 400 is connected to the filter box 300, and the other end is connected to the air collection groove. The filter box 300 is connected to an external air extraction device (not shown in the figure).

[0029] Understandably, this embodiment physically separates the spray gun working area (first groove 2101) and the collection area (second groove 2102) by designing a gas collection hood 200 with a baffle 220. A negative pressure is created within the gas collection groove using an air extraction device, forcing the scattered paint mist to be directionally drawn into the second groove 2102 instead of spreading out, thereby improving the initial capture efficiency. The first filter drawer 230 can be directly inserted or pulled out through the first drawer opening 2104 on the side of the hood 210. When the paint mist passes through the two first filter screens 232, most of the paint residue is intercepted within the first filter drawer 230. Replacement is simple; the entire first filter drawer 230 can be pulled out and replaced, achieving quick and mess-free maintenance. This ensures that when the primary filter layer is saturated, the system's collection capacity can be restored in the shortest possible time. Simultaneously, the pre-filtered gas enters the subsequent filter box 300 for fine filtration via the connecting pipe 400, reducing the burden on the downstream filter box 300, extending its service life, and ensuring the continuous and stable operation of the entire collection and filtration system. This embodiment employs a clever structural design of "200-zone air collection hood" and "drawer-type filter" to combine efficient paint mist capture with convenient maintenance of the filter components, thereby effectively solving the dual problems of difficult paint mist pollution control and low equipment maintenance efficiency in the painting industry.

[0030] Furthermore, such as Figure 2As shown, the enclosure 220 has a ring-shaped structure and is adjacent to the center of the cover 210. The first filter drawer 230 has a U-shaped structure. The air collection cover 200 also includes two sets of limiting support parts 240. The length of the cover 210 extends along the second direction (Z direction in the figure), and the width of the cover 210 extends along the third direction (Y direction in the figure). The first drawer opening 2104 is located on one side of the cover 210 along the second direction. The two sets of limiting support parts 240 are located on two opposing inner walls of the cover 210 along the third direction. Each set of limiting support parts 240 includes two limiting support bars. The two limiting support bars are spaced apart along the first direction. The first filter drawer 230 is inserted into the first drawer opening 2104 and is located between the two limiting support bars. The first direction, the second direction, and the third direction are perpendicular to each other.

[0031] In this embodiment, the first filter drawer 230 has a U-shaped structure. When the first filter drawer 230 is inserted, its U-shaped internal space surrounds the outer side of the annular enclosure 220, thus forming a continuous air collection channel (i.e., air collection groove) surrounding the spray gun. This structural design ensures that the negative pressure is strictly limited within the U-shaped drawer cavity outside the annular enclosure 220, forcing all inhaled paint mist to first pass through the first filter 232 facing the hood opening 2103, then through the drawer and be filtered by another first filter 232, and finally enter the air collection groove. This forms an efficient and controllable directional airflow path, thereby achieving the "encirclement" and capture of all splashed paint mist. Two sets of limiting support parts 240 are located on the inner walls on both sides of the hood 210. Each set of limiting support parts 240 supports one side of the first filter drawer 230, which can improve the sliding stability of the first filter drawer 230.

[0032] Furthermore, the cover 210 has an exhaust port 2105 on each of its two sides along the third direction. The exhaust port 2105 is connected to the air collection groove, and each exhaust port 2105 is connected to a connecting pipe 400.

[0033] In this embodiment, exhaust ports 2105 are provided on both sides of the cover 210 and connected to connecting pipes 400 respectively. This is equivalent to simultaneously drawing air from both ends of the air collection tank, which can establish a uniform and balanced negative pressure field throughout the entire air collection tank. Regardless of whether the paint mist splashes onto the left or right side inside the cover 210, it will be subjected to almost equal suction and quickly pulled towards the nearest first filter 232. This reduces airflow resistance and reduces the chance of paint mist adhering to and accumulating on the inner wall of the air collection cover 200, the enclosure 220, and other structural surfaces, thereby reducing the frequency of cleaning and maintenance.

[0034] Furthermore, the exhaust port 2105 is disposed adjacent to one side wall of the shroud 210 along the second direction, and the shroud 210 includes a bottom plate 211 facing the shroud opening 2103, such as... Figure 3As shown, the bottom plate 211 is inclined. Along the second direction, the distance between the end of the bottom plate 211 adjacent to the exhaust port 2105 and the opening 2103 is greater than the distance between the end of the bottom plate 211 away from the exhaust port 2105 and the opening 2103.

[0035] In this embodiment, the bottom plate 211 is designed to be inclined, which allows sufficient space on the side wall of the cover 210 to open the exhaust port 2105, and allows the exhaust port 2105 to be large enough to improve the paint mist collection efficiency.

[0036] The enclosure 220 is inserted through the bottom plate 211 of the cover body 210. The enclosure 220 has an open end, and a mounting plate for mounting a spray gun is fixed at the end of the enclosure 220 away from the open end.

[0037] Furthermore, the first filter drawer 230 also includes a first handle 233, which is disposed on one side of the first drawer frame 231 along the second direction and is located outside the cover 210.

[0038] By setting the first handle 233, the first filter drawer 230 can be pulled out by holding the first handle 233, which is convenient and quick to operate. Specifically, the first drawer opening 2104 is located above the cover 210. After the first filter drawer 230 is inserted into the first drawer opening 2104, it can be stably placed in the second groove 2102 under its own weight.

[0039] Furthermore, the gas collection hood 200 also includes a cover plate 250, which is installed at the hood opening 2103. A first filter screen 232 adjacent to the hood opening 2103 abuts against the cover plate 250. The cover plate 250 has a plurality of first clearance holes 2501 facing the first filter screen 232, and a second clearance hole 2502 facing the first groove 2101.

[0040] The cover plate 250 can improve the installation stability of the first filter screen 232 on the first drawer frame 231. At the same time, the cover plate 250 can be used to seal the gap between the outer periphery of the first filter drawer 230 and the inner wall of the cover 210, preventing paint mist from entering the gap and facilitating the cleaning of the air collection hood 200.

[0041] Furthermore, such as Figure 4 As shown, the filter box 300 includes a box body 310 and a second filter drawer 320. The box body 310 is provided with a filter chamber and an air inlet 3101 and an air outlet 3102 communicating with the filter chamber. The air inlet 3101 is connected to a connecting pipe 400, and the air outlet 3102 is connected to an external air extraction device. The box body 310 is also provided with a second drawer opening 3103 communicating with the filter chamber. The second filter drawer 320, which is inserted into the filter chamber through the second drawer opening 3103, is located between the air inlet 3101 and the air outlet 3102.

[0042] In this embodiment, a second filter drawer 320 is installed inside the housing 310. Paint mist generated during the painting process is collected and filtered by the gas collection hood 200, then enters the filter chamber through the connecting pipe 400. After being filtered again by the second filter drawer 320, it is then extracted through the exhaust port 3102. When cleaning is required, the second filter drawer 320 can be easily removed from the drawer opening 3103 for cleaning, making the operation convenient.

[0043] Furthermore, there are multiple second filter drawers 320, which are spaced apart along the first direction. There are also multiple second drawer openings 3103, which correspond one-to-one with the second filter drawers 320.

[0044] By setting multiple second filter drawers 320, only one second filter drawer 320 can be taken out for cleaning at a time, and then put back after cleaning, and then the next second filter drawer 320 can be cleaned. The machine can be stopped during the cleaning process, which improves the efficiency of paint mist collection and filtration.

[0045] like Figure 4 As shown, the number of second filter drawers 320 in this embodiment is two. In other embodiments, three or even more can be designed according to the size of the body 310 of the filter box 300. The specific details will not be elaborated here.

[0046] Furthermore, the second filter drawer 320 includes a second drawer frame 321 and two second filters 322, which are located on opposite sides of the second drawer frame 321 along a first direction. One second filter 322 is directly opposite the air intake 3102, and the other second filter 322 is adjacent to the air inlet 3101.

[0047] The second filter drawer 320 in this embodiment includes a second drawer frame 321 and two second filters 322. Each second filter drawer 320 can perform two filtrations on the paint mist after the initial filtration, thereby improving the paint mist filtration effect.

[0048] Furthermore, the second filter drawer 320 also includes a second handle 323, which is located on one side of the second drawer frame 321 along the second direction and is located outside the housing 310; two air inlets 3101 are located on opposite sides of the housing 310 along the third direction; the first direction, the second direction and the third direction are perpendicular to each other.

[0049] By providing a second handle 323 on the outer periphery of the second drawer frame 321 and positioning the second handle 323 outside the housing 310, the second filter drawer 320 can be pulled out by gripping the second handle 323, making the operation convenient and quick. Specifically, the second drawer opening 3103 is located above the housing 310. After the second filter drawer 320 is inserted through the second drawer opening 3103, it can be stably placed in the second groove 2102 under its own weight.

[0050] In this embodiment, two air inlets 3101 are designed and placed on opposite sides of the housing 310 along the third direction. On the one hand, this facilitates the connection operation of the connecting pipe 400. On the other hand, it can buffer the airflow entering the housing 310 and prevent the airflow from directly hitting the second filter drawer 320 and causing premature blockage of the second filter drawer 320.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A paint mist collection and filtration device, characterized in that, The device includes a mounting base, a gas collection hood, a filter box, and a connecting pipe. The filter box is mounted on the mounting base. The gas collection hood includes a hood body, a baffle portion, and a first filter drawer. The hood body is mounted on the mounting base. The baffle portion is connected to the hood body and extends into the hood body. The baffle portion divides the interior of the hood body into a first groove and a second groove. The first groove is used to install a spray gun. The hood body has a hood opening on one side along a first direction. The openings of the first groove and the second groove are both directly opposite the hood opening. A first drawer opening communicating with the second groove is opened on the periphery of the hood body. The first filter drawer passes through the first drawer opening and is inserted into the second groove. The first filter drawer includes a first drawer frame and two first filter screens. The two first filter screens are located on opposite sides of the first drawer frame along the first direction. One first filter screen is adjacent to the hood opening, and the other first filter screen forms a gas collection groove between itself and the hood body along one side along the first direction. One end of the connecting pipe communicates with the filter box, and the other end communicates with the gas collection groove. The filter box is connected to an external air extraction device.

2. The paint mist collection and filtration device according to claim 1, characterized in that, The enclosure is arranged in a ring shape at the center of the hood, and the first filter drawer is U-shaped. The gas collection hood also includes two sets of limiting support parts. The length of the hood extends along a second direction, and the width of the hood extends along a third direction. The opening of the first drawer is located on one side of the hood along the second direction. The two sets of limiting support parts are located on two opposing inner walls of the hood along the third direction. Each set of limiting support parts includes two limiting support bars, which are spaced apart along the first direction. The first filter drawer is inserted into the opening of the first drawer and is located between the two limiting support bars. The first direction, the second direction, and the third direction are perpendicular to each other.

3. The paint mist collection and filtration device according to claim 2, characterized in that, The cover is provided with an exhaust port on each of its two sides along the third direction. The exhaust port is connected to the air collection groove, and each exhaust port is connected to a connecting pipe.

4. The paint mist collection and filtration device according to claim 3, characterized in that, The exhaust port is located adjacent to one side wall of the cover body along the second direction. The cover body has a bottom plate facing the cover opening. The bottom plate is inclined and along the second direction, the distance between the end of the bottom plate adjacent to the exhaust port and the cover opening is greater than the distance between the end of the bottom plate away from the exhaust port and the cover opening.

5. The paint mist collection and filtration device according to claim 1, characterized in that, The first filter drawer also includes a first handle, which is disposed on one side of the first drawer frame along a second direction and is located outside the cover.

6. The paint mist collection and filtration device according to claim 1, characterized in that, The gas collection hood also includes a cover plate, which is installed at the hood opening. A first filter screen adjacent to the hood opening abuts against the cover plate. The cover plate has a plurality of first clearance holes facing the first filter screen and a second clearance hole facing the first groove.

7. The paint mist collection and filtration device according to any one of claims 1 to 6, characterized in that, The filter box includes a box body and a second filter drawer. The box body is provided with a filter cavity and an air inlet and an air outlet communicating with the filter cavity. The air inlet is connected to the connecting pipe, and the air outlet is connected to an external air extraction device. The box body is also provided with a second drawer opening communicating with the filter cavity. The second filter drawer, which is inserted into the filter cavity through the second drawer opening, is located between the air inlet and the air outlet.

8. The paint mist collection and filtration device according to claim 7, characterized in that, There are multiple second filter drawers, which are spaced apart along the first direction. There are multiple second drawer openings, and each second drawer opening corresponds to a second filter drawer.

9. The paint mist collection and filtration device according to claim 7, characterized in that, The second filter drawer includes a second drawer frame and two second filters, which are located on opposite sides of the second drawer frame along the first direction. One of the second filters faces the air intake, and the other second filter is adjacent to the air inlet.

10. The paint mist collection and filtration device according to claim 9, characterized in that, The second filter drawer also includes a second handle, which is disposed on one side of the second drawer frame along a second direction and is located outside the housing; the two air inlets are located on opposite sides of the housing along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

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