Multi-unit air filtration device

Abstract

The present invention relates to the technical field of air filtration, and discloses a multi-unit air filtration device, comprising a shell and a plurality of filter units; the multi-unit air filtration device introduces external air from an atmospheric inlet, and when the airflow passes through a filter channel formed on the side wall of each filter unit, the guide channel guides the clean air into a clean inner cavity, and the clean air flows from the clean inner cavity to the clean air outlet, and the air containing impurities is discharged from the exhaust port, thereby realizing the separation of clean air and impurities, and being able to stably transport the clean air to a designated area, which not only avoids the accumulated impurities from clogging the air filtration device, but also saves the trouble of manually cleaning the air filtration device, saves manpower, material resources and financial resources, and can ensure normal operation for a long time without cleaning.

Description

Technical Field

[0001] The present invention relates to the technical field of air filtration, and in particular to a multi-unit air filtration device. Background Art

[0002] Internal combustion engines are indispensable equipment in transportation vehicles and military equipment. The complete combustion of fuel in internal combustion engines requires sufficient air to be supplied to the internal combustion engine from the outside, and the oxygen in the air is used to support the combustion of fuel. When the air entering the internal combustion engine contains impurities such as sand, dust, and debris, the impurities will cause wear on the internal combustion engine and shorten the service life of the internal combustion engine. In order to prevent impurities from entering the internal combustion engine, an air filter needs to be installed in the air supply channel of the internal combustion engine.

[0003] Existing air filters used for internal combustion engine air supply typically use centrifugal force to separate impurities from the air, which is then filtered through a filter element to produce clean air. For example, a cyclone filter utilizes centrifugal force to separate solid particles or liquid droplets from an airflow. When a flow of liquid or impurities enters the filter, the rotating vortex within the cyclone creates a strong vortex motion, generating strong centrifugal forces that cause solid particles and liquid impurities to adhere to the cyclone. After being separated from the airflow, the impurities accumulate in the dust collection area of the container. The purified air then exits the cyclone filter and enters one or more filter elements in the next stage, where small solid particles are removed.

[0004] The above air filter has the following problems:

[0005] 1. When the airflow rotates at high speed, wall pressure is generated on the inner wall of the cyclone filter. The wall pressure blocks small particles of dust or impurities with a smaller specific gravity (especially floating objects such as plant debris, catkins, and poplar catkins) from approaching, so these impurities cannot settle and be removed.

[0006] 2. Each cyclone occupies a large space, and the number of cyclones installed in a limited space is small, resulting in a low rate of clean air delivery by the cyclone filter.

[0007] 3. Traditional filtration methods, such as metal mesh filters, fiber filters, and paper filters, are all passive adsorption filters. Passive filtration can only produce two results: dust passes through the filter, rendering it ineffective; or dust is adsorbed on the filter, gradually blocking the airflow path and reducing air intake. To ensure proper operation, passive filters require frequent cleaning or replacement of the filter element, which is time-consuming and labor-intensive. The material cost of using a large number of filter elements is also high. Failure to perform these tasks in an emergency without sufficient time for cleaning or replacement can negatively impact engine operation and even lead to serious accidents.

[0008] 4. When encountering a humid external environment such as rain or dew, moisture enters the fine filtration device, and the dust layer on the surface of the filter element will turn into mud when it comes into contact with water, which will further seriously block the air flow channel. Summary of the Invention

[0009] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a multi-unit air filtration device, which can separate large particles, small particles and floating objects from the air, stably provide clean air, and directly discharge impurities while delivering clean air, thereby avoiding the accumulated impurities from clogging the air filtration device and saving the trouble of manual cleaning of the air filtration device, thereby improving the efficiency of delivering clean air. Each filtration unit occupies a small space, so that multiple filtration units can be arranged inside the device, which can further improve the efficiency of delivering clean air.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A multi-unit air filtration device, characterized in that it includes a shell and several filter units, the shell is provided with an atmospheric inlet, an exhaust port and a clean air outlet; each of the filter units is fixed in parallel in the shell, and the gaps between each of the filter units and between the filter units and the inner wall of the shell are filter channels, and the filter channels face the atmospheric inlet; the filter units have a clean inner cavity, and the clean inner cavity is connected to the clean air outlet; a plurality of guide channels connecting the clean inner cavity and the filter channels are connected to the side walls of the filter units, the sum of the cross-sectional areas of the guide channels is greater than the cross-sectional area of the filter channels, the guide channels and the filter channels have an angle α, the apex of the angle α faces away from the atmospheric inlet, and the angle α is less than 90°.

[0012] In the present invention, preferably, the clean inner cavity has a first opening and a second opening, the first opening is communicated with the clean air outlet, and the second opening is blocked by the side wall of the shell.

[0013] In the present invention, preferably, a convex side wall is provided at a position of the shell corresponding to each of the first openings, the clean air outlet is opened on the convex side wall, and a partition side wall for blocking the air containing impurities from flowing toward the clean air outlet is provided at a position inside the shell corresponding to the convex side wall, and a number of clean air internal outlets corresponding to the positions of the first openings are opened on the partition side wall, and the partition side wall is tightly fitted or fixedly connected to the edge of the first opening.

[0014] In the present invention, preferably, a fine filter is fixed between the convex side wall and the partition side wall.

[0015] In the present invention, preferably, the guide channel includes a plurality of through grooves provided on the side wall of the filter unit and a plurality of guide plates fixedly connected to the edges of the through grooves.

[0016] In the present invention, preferably, the guide plate is in a straight line shape, an arc shape or a broken line shape.

[0017] In the present invention, preferably, the end of the filter channel farther from the atmosphere inlet is a filter outlet, and the side wall of the filter unit located at the filter outlet protrudes outward.

[0018] In the present invention, preferably, a plurality of protrusions are provided on the outer side wall of the filter unit.

[0019] In the present invention, preferably, a cylindrical filter screen is further included, and the cylindrical filter screen is fixed at the atmosphere inlet.

[0020] In the present invention, preferably, the atmosphere inlet is located at the top of the shell, the exhaust port is located at the bottom of the shell, and the bottom surface of the shell is a downwardly convex arc surface.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The multi-unit air filter device of the present invention introduces external air from the atmospheric inlet. When the airflow passes through the filter channel formed on the side wall of each filter unit, the guide channel guides the clean air into the clean inner cavity. The clean air flows from the clean inner cavity to the clean air outlet, and the air containing impurities is discharged from the exhaust port, thereby achieving the separation of clean air and impurities, and can stably deliver the clean air to the designated area, which not only prevents the accumulated impurities from clogging the air filter device, but also saves the trouble of manual cleaning of the air filter device, saving manpower, material resources and financial resources, and can ensure normal operation for a long time without cleaning. Each filter unit occupies a small space, and multiple filter units can be installed in the shell, thereby improving the efficiency of conveying clean air; the inner wall of the shell is used to block the second opening of the clean inner cavity, which not only expands the volume of the filter channel and the clean inner cavity, but also saves materials for manufacturing the filter unit; an outer convex side wall is provided, and a separating side wall is provided inside the outer convex side wall, which can achieve better isolation between clean air and turbid air, so that clean air flows to the clean air outlet, and maximizes the use of the space in the shell, increases the output of clean air, and further saves materials used to constitute the filter unit; a fine filter is provided at the clean air outlet, which can further filter out impurities and make the conveyed air cleaner; the guide channel is formed by through holes and guide plates, which has a simple structure and is easy to implement; the filter channel narrows at the filter outlet, It can speed up the flow rate of air containing impurities and promote the rapid discharge of impurities; the protrusions are set on the outer wall of the filter unit, which can increase the friction here, increase the pressure at the edge of the airflow, keep the impurities in the center of the airflow, and reduce the probability of them entering the guide channel; the cylindrical filter increases the filtration area and forms a certain centrifugal force inside it, which improves the efficiency of intercepting impurities and further improves the quality of clean air delivery; the atmospheric inlet and exhaust port are respectively set at the top and bottom of the shell, and the bottom surface of the shell is set to an outwardly convex arc surface, which is conducive to the deposition of impurities at the bottom of the shell and their discharge from the exhaust port. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of a multi-unit filtration device.

[0024] Figure 2 A perspective view of the shell.

[0025] Figure 3 This is a three-dimensional view of the shell from another angle.

[0026] Figure 4 A top view of the shell.

[0027] Figure 5 for Figure 4 Cross-sectional view of the middle shell along line AA.

[0028] Figure 6 for Figure 4 Cross-sectional view of the middle casing along line BB.

[0029] Figure 7 A three-dimensional diagram of multiple filter units.

[0030] Figure 8 This is a three-dimensional view of multiple filter units from another angle.

[0031] Figure 9 This is a schematic diagram of the structure of the front of multiple filter units.

[0032] Figure 10 for Figure 9 Enlarged view of part C in the middle.

[0033] Figure 11 It is a structural schematic diagram of the front side of the filter unit including the arc-shaped guide vane.

[0034] Figure 12 for Figure 11 Enlarged view of part D in the middle.

[0035] Figure 13 It is a structural schematic diagram of the front side of the filter unit including the broken line guide vane.

[0036] Figure 14 for Figure 13 Enlarged view of middle part E.

[0037] Figure 15 A cross-sectional view of the front of a multi-unit air filter.

[0038] Figure 16 A cross-sectional view of the right side of a multi-unit air filter.

[0039] Figure 17 A perspective view of a fine filter.

[0040] Figure 18 It is a three-dimensional diagram of a cylindrical filter.

[0041] In the accompanying drawings: 1-shell, 101-atmospheric inlet, 102-exhaust port, 103-clean air outlet, 104-convex side wall, 105-partitioning side wall, 106-clean air internal outlet, 2-filter unit, 201-clean inner cavity, 202-first opening, 203-second opening, 204-through groove, 205-guide plate, 206-arc-shaped guide plate, 207-broken line guide plate, 208-protrusion, 3-filter channel, 301-filter inlet, 302-filter outlet, 4-fine filter, 5-cylindrical filter. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] Please also see Figures 1 to 18 A preferred embodiment of the present invention provides a multi-unit air filtration device, including a shell 1 and a plurality of filter units 2.

[0046] In this embodiment, the housing 1 is provided with an atmospheric inlet 101, an exhaust port 102, and a clean air outlet 103. The atmospheric inlet 101 is used to allow outside air to enter the housing 1, the exhaust port 102 is used to discharge the air containing impurities in the housing 1 to the outside of the housing 1, and the clean air outlet 103 is used to transport the clean air in the housing 1 to a designated area.

[0047] Each filter unit 2 is fixed in the housing 1, and each filter unit 2 is arranged side by side, preferably evenly. In this way, gaps are formed between the filter units 2, and gaps are also formed between the filter units 2 located at the edge and the inner wall of the housing 1. These gaps serve as filter channels 3, and the clean air and impurities in the external atmosphere will be separated in the filter channels 3. The filter channel 3 should face the atmospheric inlet 101, that is, the filter channel 3 should be perpendicular to the surface where the atmospheric inlet 101 is located. The filter channel 3 has openings at both ends. The end close to the atmospheric inlet 101 is the filter inlet 301, and the end away from the atmospheric inlet 101 is the filter outlet 302.

[0048] The interior of the filter unit 2 is a clean inner cavity 201, which is connected to the clean air outlet 103 by some means, for example, via a pipe. Several diversion channels are connected to the sidewalls of the filter unit 2. One end of each diversion channel is connected to the filter channel 3, and the other end is connected to the clean inner cavity 201. In other words, the diversion channels connect the clean inner cavity 201 of the filter unit 2 with the exterior of the filter unit 2, allowing air in the filter channel 3 to enter the clean inner cavity 201 through the diversion channels. The sum of the cross-sectional areas of the diversion channels is greater than the cross-sectional area of the filter channel 3. The diversion channels and the filter channel 3 form an angle, α. The apex of angle α faces away from the atmospheric inlet 101, and angle α is less than 90°, so that the airflow direction in the diversion channels deviates from the airflow direction in the filter channel 3. The angle between the two should be understood as the angle between the overall shape of the diversion channels and the filter channel 3. For example, if the guide channel is straight, the angle between the straight line where the guide channel is located and the straight line where the filter channel 3 is located is the angle α; for another example, if the guide channel is arc-shaped, the angle between the tangent of the midpoint of the arc where the guide channel is located and the straight line where the filter channel 3 is located is the angle α; for another example, if the guide channel is irregular in shape, it is necessary to consider the angle trend of the angle between the overall shape of the guide channel and the filter channel 3, for example, take the positive and negative angles of the angle between the tangent of each point of the irregular guide channel and the filter channel 3, and sum up the various angles to get the total angle, which is the angle α.

[0049] Specifically, the air filter device operates as follows: when there is a certain airflow velocity in the outside air, the atmospheric inlet 101 is oriented in the direction of the air flow, allowing the outside air to enter the housing 1 through the atmospheric inlet 101, then enter the filter channel 3 through the filter inlet 301. The air entering the filter channel 3 contains impurities. Within the filter channel 3, the impurity-laden air flows toward the filter outlet 302. When passing through the guide channel, some of the air enters the guide channel and then enters the clean inner cavity 201. This air is considered clean air.

[0050] Because the sum of the cross-sectional areas of the diversion channels is larger than that of the filter channel 3, and because the airflow loses energy due to friction between the filter channel 3 and the diversion channels, the airflow velocity within the diversion channels is slower than that within the filter channel 3. Impurities such as sand, flocs, dust, and water droplets entrained in the airflow of the filter channel 3 tend to move from the filter inlet 301 to the filter outlet 302 under the influence of the bidirectional airflow, while simultaneously moving from the center of the filter channel 3 toward the diversion channels. However, the weak attraction force within the diversion channels cannot overcome the impurities' inertia. Consequently, the airflow velocity within the filter channel 3 is greater than that within the diversion channels, allowing impurities to quickly pass through the portion of the filter channel 3 where the diversion channels are located (with a transit time as short as a few tenths of a second). Before entering the diversion channels, the impurities have already flowed through the area of the filter channel 3 connected to the diversion channels, preventing them from entering the diversion channels. This allows the clean air and impurities to separate naturally. The ratio or difference between the air flow velocity in the guide channel and the air flow velocity in the filter channel 3 can be adjusted by adjusting the difference in the cross-sectional areas of the two channels and adding a power source such as a fan in the pipeline.

[0051] At the same time, the airflow in filter channel 3 exerts a strong dynamic pressure. When the high-pressure gas impacts the inner wall of the guide channel, a high-pressure area is generated on the inner wall of the guide channel. According to Bernoulli's principle, the airflow at the center of filter channel 3 has a fast flow rate but low static pressure. Meanwhile, the airflow in the guide channel and the surrounding area on the side of filter channel 3 suffers a certain amount of kinetic energy loss, resulting in a slow flow rate but high static pressure. In this case, impurities such as particulate matter, flocs, and water droplets entrained in the airflow of filter channel 3 generate a pressure difference due to the unequal static pressure, causing them to shift. The impurities move to the center of the airflow, where the static pressure is low, and do not enter the guide channel. As a result, they flow smoothly from the filter outlet 302 to the exhaust port 102 along with the airflow of filter channel 3, and are then discharged back into the atmosphere through the exhaust port 102.

[0052] On the other hand, the air in the guide channel flows obliquely rearward relative to the air in the filter channel 3. That is, the air in the guide channel flows obliquely rearward at an angle α to the air flow direction of the filter channel 3. When the airflow enters the guide channel and flows obliquely rearward, a static pressure greater than the pressure at the center of the airflow in the filter channel 3 is generated at the junction of the guide channel and the filter channel 3. This static pressure can push lighter impurities (such as flocculent matter) entrained in the airflow of the filter channel 3 near the guide channel back to the center of the filter channel 3, preventing them from entering the guide channel. The lighter impurities will continue to move with the airflow toward the filter outlet 302. However, heavier impurities (such as sand particles) entrained in the airflow of the filter channel 3 will collide with the inner wall of the guide channel if they reach the guide channel, and be ejected back to the center of the filter channel 3. Due to their own inertia, they will continue to move toward the filter outlet 302 and will not move into the obliquely rearward guide channel.

[0053] After the above three processes, clean air without impurities can enter the clean inner cavity 201 from the guide channel, while impurities such as particulate matter and floating objects are discharged from the exhaust port 102 through the filter outlet 302 along with the air flow of the filter channel 3. In this way, the clean air and impurities are separated by the air filter device.

[0054] The number of filter units 2 can be only one, which is fixed in the shell 1 according to the aforementioned position and connection relationship. The gap between the side wall of the filter unit 2 and the side wall of the shell 1 perpendicular to the atmospheric inlet 101 is the filter channel 3. After the air enters the filter channel 3, the aforementioned process of separating clean air from impurities can be realized; the number of filter units 2 can also be multiple, and the gaps between the filter channels 3 and the gaps between the side walls of the filter unit 2 and the side walls of the shell 1 perpendicular to the atmospheric inlet 101 are all filter channels 3, which can also realize the aforementioned process of separating clean air from impurities.

[0055] The clean inner cavity 201 is connected to the clean air outlet 103. As the air pressure in the clean inner cavity 201 continues to increase, clean air will flow out of the housing 1 through the clean air outlet 103. The clean air outlet 103 can be connected to the air intake of the internal combustion engine, thereby continuously providing clean air to the internal combustion engine. The exhaust port 102 is directly connected to the atmosphere, and the turbid air containing impurities after filtering is directly discharged back into the atmosphere through the exhaust port 102.

[0056] When the air flow velocity in the atmosphere is relatively low and cannot meet the flow velocity required for the operation of the multi-unit air filtration device, a fan can be installed at the atmospheric inlet 101 to generate an air flow at the required speed so that the multi-unit air filtration device maintains a good working condition. Fans can also be installed separately or simultaneously at the exhaust port 102, the clean air outlet 103, etc. to control the air flow velocity of the filter channel 3 and the guide channel so that the multi-unit air filtration device reaches the best working condition.

[0057] This device utilizes airflow to allow impurities in the air to be directly discharged from the exhaust port 102 after passing through the filter channel 3, and utilizes the guide channel to guide the clean air into the clean inner cavity 201. The clean air in the clean inner cavity 201 flows to the designated area through the clean air outlet 103, thereby achieving the separation of large particles, small particles and floating objects from the clean air, and can stably provide clean air for internal combustion engines, etc. Impurities can be directly discharged while transporting clean air, which not only avoids the accumulated impurities from clogging the air filter device, but also saves the trouble of manually cleaning impurities, saving manpower, material resources and financial resources.

[0058] In a preferred embodiment of the present invention, the clean inner cavity 201 has two openings: a first opening 202 and a second opening 203. The first opening 202 communicates with the clean air outlet 103 via a sealing structure to ensure that turbid air containing impurities does not contaminate the clean air. For example, a pipe directly connects the first opening 202 and the clean air outlet 103, allowing clean air in the clean inner cavity 201 to flow directly to the clean air outlet 103 through the first opening 202. The clean inner cavity 201 needs to be isolated from the turbid air outside it, so the second opening 203 should be closed or omitted. However, to save material and fully utilize space for air filtration, the clean inner cavity 201 can be enclosed by the sidewalls of the housing 1. Specifically, the clean inner cavity 201 can be provided with a second opening 203. The edges of the second opening 203 are tightly attached to or fixedly connected to the sidewalls of the housing 1, thereby blocking the second opening 203. A first opening 202 and a second opening 203 are provided on the clean inner cavity 201, and the first opening 202 is communicated with the clean air outlet 103, and the second opening 203 is blocked by the side wall of the shell 1, so that clean air can be transported from the clean inner cavity 201 to the clean air outlet 103, and the space in the shell 1 can be fully utilized to filter the air, thereby increasing the output of clean air and saving materials used to constitute the filter unit 2.

[0059] In a preferred embodiment of the present invention, a convex sidewall 104 is provided on the housing 1 at a position corresponding to the first opening 202 of each filter unit 2. The clean air outlet 103 is provided on this convex sidewall 104. Compared to the surrounding sidewalls of the housing 1, the convex sidewall 104 protrudes further outward from the housing 1, thereby forming a certain convex space on the side of the housing 1. A partition sidewall 105 is provided within the housing 1 at a position corresponding to the convex sidewall 104. The partition sidewall 105 separates the convex space from the main space within the housing 1, thereby isolating the turbid air containing impurities in the main space within the housing 1 from entering the convex space. A plurality of clean air internal outlets 106 are provided on the partition sidewall 105. The clean air internal outlets 106 correspond to the positions of the first openings 202. The edges of the clean air internal outlets 106 are tightly attached or fixedly connected to the partition sidewall 105, ensuring that there is no gap between the filter unit 2 and the partition sidewall 105, preventing turbid air from contaminating the clean air. The shape and size of the clean air internal outlet 106 are preferably the same as those of the first opening 202, so that the clean air can enter the convex space to the maximum extent. Through the action of the partition sidewall 105, it can be ensured that the clean air flows from the clean inner cavity 201 into the convex space, and the turbid air will not contaminate the clean air. Then, the clean air can be transported to a designated area through the clean air outlet 103 provided on the convex sidewall 104, for example, the clean air outlet 103 is connected to the air intake of the internal combustion engine. The convex sidewall 104 can be integrally formed with the other parts of the shell 1, or it can be a separate structure from the other parts of the shell 1 and fixedly connected in a certain manner. Similarly, the partition sidewall 105 can be integrally formed with the other parts of the shell 1, or it can be a separate structure from the other parts of the shell 1 and fixedly connected in a certain manner. An outwardly convex side wall 104 is provided on the shell 1, and a partition side wall 105 is provided inside the outwardly convex side wall 104, which can achieve better isolation between clean air and turbid air, allowing the clean air to flow to the clean air outlet 103, and maximize the use of the space in the shell 1, thereby increasing the output of clean air and further saving the material used to constitute the filter unit 2.

[0060] In a preferred embodiment of the present invention, a fine filter 4 is fixed within the convex space between the convex sidewall 104 and the partitioning sidewall 105. Since the air entering the convex space from the clean space is filtered clean air, it contains relatively few impurities and is almost free of large particles or flocs. Therefore, fine filtration is performed here. Fine filter 4 removes fine impurities from the clean air, further cleaning it. An activated carbon filter can be employed. The placement of fine filter 4 between the convex sidewall 104 and the partitioning sidewall 105 further filters the clean air, further cleaning the air delivered to the designated area.

[0061] In a preferred embodiment of the present invention, the sidewalls of the filter unit 2 are provided with a plurality of through slots 204. Guide plates 205 are connected to the edges of these slots 204. The space between two adjacent guide plates 205 forms a guide channel, through which clean air enters the clean inner cavity 201. The surfaces of the guide plates 205 contact the clean air, forming the inner walls of the guide channel. The orientation of the guide plates 205 determines the direction of the guide channel, so the angle between the guide plates 205 and the filter channel 3 is angle α. The guide plates 205 can have a variety of shapes, such as flat or curved rectangles, squares, diamonds, trapezoids, semicircles, and the like. By providing the through slots 204 in the filter channel 3 and connecting the guide plates 205 along the edges of the through slots 204, a guide channel can be connected to the side of the filter channel 3, thereby separating clean air from impurities. This simple and easy-to-implement structure provides excellent air filtration.

[0062] In a preferred embodiment of the present invention, the guide vane 205 is linear, arc-shaped, or zigzag. When a linear guide vane is used, the angle between the linear guide vane and the side of the filter channel 3 is angle α, and air flows along the linear guide vane as it passes through. When an arc-shaped guide vane 206 is used, the angle between the tangent at the midpoint of the arc-shaped guide vane 206 and the side of the filter channel 3 is angle α, and air flows along the arc-shaped guide vane 206 as it passes through, with its overall flow direction forming an angle α with the filter channel 3. When a zigzag guide vane 207 is used, the portion of the zigzag guide vane 207 that is inclined toward the side of the filter channel 3 determines its overall direction, and the angle between the portion of the zigzag guide vane 207 that is inclined toward the side of the filter channel 3 is angle α. When air passes through, it first flows along the portion of the zigzag guide vane 207 that is inclined toward the side of the filter channel 3, then turns in a direction opposite to the airflow in the filter channel 3, and finally exits the guide channel. The guide plates 205 in the above-mentioned straight line, arc shape or broken line shape can form a guide channel to achieve separation of clean air and impurities, and the structure is simple and easy to implement.

[0063] In a preferred embodiment of the present invention, the sidewall of the filter unit 2 at the filter outlet 302 protrudes outward. Due to the outward protrusion of the sidewall of the filter unit 2, the cross-sectional area of the filter channel 3 at the filter outlet 302 becomes smaller, and the filter channel 3 narrows at this location. As a result, the turbid air will flow faster at this location and then accelerate toward the exhaust port 102. The convex sidewall of the filter unit 2 at the filter outlet 302 can accelerate the turbid air at the outlet of the filter channel 3, allowing the turbid air to be discharged from the exhaust port 102 as quickly as possible, thereby minimizing the possibility of impurities accumulating within the housing 1.

[0064] In a preferred embodiment of the present invention, a plurality of protrusions 208 are provided on the outer wall of the filter unit 2. The protrusions 208 can be provided continuously or at intervals, and their number is not fixed. The cross-sections of these protrusions 208 can be one or more of the following shapes: arc, triangle, quadrilateral, etc. The protrusions 208 are provided on the outer wall of the filter unit 2, that is, the protrusions 208 are provided on the edge of the filter channel 3. The function of the protrusions 208 is to make the edge portion of the filter channel 3 rougher, with the purpose of increasing the surface friction of the edge portion of the filter channel 3. The protrusions 208 provided on the outer wall of the filter unit 2 increase the friction at the edge of the filter channel 3, increase the static pressure at the edge of the filter channel 3, and make impurities more stably located in the center of the airflow of the filter channel 3, making it more difficult for them to enter the guide channel, thereby ensuring a more stable supply of clean air.

[0065] In a preferred embodiment of the present invention, the multi-unit air filtration device further includes a cylindrical filter 5, which is fixed to the atmospheric inlet 101. The cylindrical filter 5 has the basic shape of a cylinder with multiple side surfaces connected together. The cylinder has a large number of through-holes formed on the side surfaces. The cylindrical filter 5 covers the atmospheric inlet 101 and is fixedly connected to the housing 1. Because the cylindrical filter 5 has a cylindrical structure within it, airflow creates a rotating airflow. When impurities enter the cylindrical structure, they are subjected to the centrifugal force of the rotating airflow and are likely to adhere to the cylindrical wall of the filter. Furthermore, the filtration area of the cylindrical filter 5 is significantly greater than that of a flat filter, resulting in a larger contact area between the cylindrical filter 5 and the atmospheric inlet 101, allowing it to filter out more impurities. The outer surface of the cylindrical filter 5 is spaced one end of the cylinder diameter from the atmospheric inlet 101. This significantly reduces the attraction of the multi-unit air filtration device to the outer surface of the cylindrical filter 5, preventing larger impurities from adhering to the filter surface and causing clogging.

[0066] In a preferred embodiment of the present invention, the atmospheric inlet 101 is located at the top of the housing 1, the exhaust port 102 is located at the bottom of the housing 1, and the bottom surface of the housing 1 is a downwardly convex curved surface. The filter inlet 301 is located near the top of the housing 1, and the filter outlet 302 is located near the bottom of the housing 1. In this structure, the air flows vertically in the filter channel 3. In addition to the force of the airflow, the gravity of the impurities themselves also drives the impurities downward vertically. This accelerates the movement of impurities within the filter channel 3 and makes it less likely for impurities to enter the diversion channel. In addition, the downwardly convex curved bottom surface of the housing 1 facilitates the collection of impurities at the bottom of the housing 1, where they are then discharged from the exhaust port 102. By arranging the atmospheric inlet 101 and exhaust port 102 from top to bottom and configuring the bottom surface of the housing 1 as a downwardly convex curved surface, impurities can be discharged more effectively, resulting in cleaner air from the multi-unit air filtration device.

[0067] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. Any equivalent changes or modifications completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A multi-unit air filtration device, characterized in that: It includes a shell and several filter units. The shell is provided with an atmospheric inlet, an exhaust port and a clean air outlet; The filter units are fixed in parallel in the housing, and the gaps between the filter units and between the filter units and the inner wall of the housing are filter channels, and the filter channels face the atmosphere inlet; The filter unit has a clean inner cavity, which is connected to the clean air outlet. The clean inner cavity has a first opening and a second opening, the first opening is connected to the clean air outlet, and the second opening is blocked by the side wall of the shell. The shell is provided with a convex side wall at a position corresponding to each of the first openings, and the clean air outlet is opened on the convex side wall. The shell is provided with a partition side wall at a position corresponding to the convex side wall for blocking the air containing impurities from flowing to the clean air outlet. A plurality of clean air internal outlets corresponding to the positions of the first openings are opened on the partition side wall. The partition side wall is tightly fitted or fixedly connected to the edge of the first opening, and a fine filter is fixed between the convex side wall and the partition side wall; The side walls of the filter unit are connected to a number of guide channels connecting the clean inner cavity and the filter channel. The sum of the cross-sectional areas of the guide channels is greater than the cross-sectional area of the filter channel. The guide channels and the filter channel have an angle α, the apex of the angle α faces away from the atmospheric inlet, and the angle α is less than 90°. The impurities entrained by the airflow of the filter channel generate a pressure difference under the action of unequal static pressure. As the airflow of the filter channel is discharged back into the atmosphere, a number of protrusions are provided on the outer side wall of the filter unit.

2. A multi-unit air filtration device according to claim 1, characterized in that: The guide channel includes a plurality of through grooves arranged on the side wall of the filter unit and a plurality of guide plates fixedly connected to the edges of the through grooves.

3. A multi-unit air filtration device according to claim 2, characterized in that: The guide plate is in a straight line, arc line or broken line shape.

4. The multi-unit air filtration device according to claim 1, characterized in that: The end of the filter channel farther from the atmosphere inlet is a filter outlet, and the side wall of the filter unit located at the filter outlet protrudes outward.

5. The multi-unit air filtration device according to claim 1, characterized in that: It also includes a cylindrical filter screen, which is fixed at the atmosphere inlet.

6. The multi-unit air filtration device according to claim 1, characterized in that: The atmosphere inlet is located at the top of the shell, the exhaust port is located at the bottom of the shell, and the bottom surface of the shell is a downwardly convex arc surface.

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