An air filter device with a rough inner wall

Abstract

The present invention relates to the technical field of air filtration, and discloses an air filtration device with a rough inner wall, comprising a plurality of filtration channels and guide channels, wherein the inner walls of the filtration channels are provided with protrusions or pits; the air filtration device with a rough inner wall is provided with a guide channel on the side of the filtration channel, and the air flows through the filtration channel and the guide channel in sequence. The convexities or pits are provided on the inner wall of the filtration channel. This arrangement increases surface friction, increases the static pressure on the inner wall, and makes impurities more stably located at the center position of the airflow in the filtration channel, thereby making it more difficult for impurities to enter the guide channel; when the airflow flows forward through the guide channel, under the action of a special structure, the dust and clean air are separated by themselves; the clean air flows into the guide channel; and the impurities at the center position are discharged back into the atmosphere under the entrainment of the airflow, which can not only stably provide clean air, but also prevent the accumulated impurities from clogging the air filtration device with the rough inner wall.

Description

Technical Field

[0001] The invention relates to the technical field of air filtration, and in particular to an air filtration device with a rough inner wall. Background Art

[0002] In daily life, industrial production, transportation, military equipment, and other fields, air filtration is often required to obtain clean air that removes impurities such as sand, dust, and debris. In daily life, clean air improves the environment and enhances the quality of life. In industrial production, clean air can be used by industrial equipment to improve equipment efficiency and reduce equipment damage.

[0003] 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. It can be seen that the air filter is also a supporting device required for the normal operation of the internal combustion engine.

[0004] Existing air filters used for internal combustion engine air supply mostly use centrifugal force to separate impurities from the air, and then filter it through a filter element to obtain clean air. For example, the working principle of a cyclone filter is a device that uses centrifugal force to separate solid particles or liquid droplets from the airflow. When an airflow containing liquid or impurities enters the filter, the airflow will produce a strong vortex motion due to the rotating vortex design inside the cyclone, thereby generating a strong centrifugal force, causing solid particles and liquid impurities to stick to the cyclone. After being separated from the airflow, the impurities are accumulated in the dust accumulation area of the container. The purified gas leaves the cyclone filter and enters the next-level fine filtration device, which is equipped with one or more filter elements to filter out small solid particles.

[0005] The above air filter has the following problems:

[0006] 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.

[0007] 2. The cyclone filter does not completely separate the air and impurities. The impurities in the output air are easily attached to the filter element. Over time, it is easy to cause the filter element to be blocked, resulting in poor filtering effect and inability to stably deliver clean air.

[0008] 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: one is that dust passes through the filter, making it ineffective; the other is that dust is adsorbed on the filter, gradually blocking the airflow path and reducing the air intake. To ensure the proper function of passive filtration, filters must be cleaned or replaced frequently, which is time-consuming and labor-intensive. The material cost of using a large number of filter elements is also high. In an emergency, if there is insufficient time to clean or replace them, the operation of the internal combustion engine will inevitably be affected, and even serious accidents may occur.

[0009] 4. When encountering a humid external environment such as rain, dew, etc., when moisture enters the fine filtration device, 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

[0010] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a new type of air filter device with a rough inner wall. The air filter device with a rough inner wall can separate large particles, small particles and floating objects from the air by itself, provide clean air more stably, and discharge impurities directly back into the atmosphere while delivering clean air, thereby avoiding the accumulated impurities from clogging the air filter device with a rough inner wall, and can be used for a long time without cleaning and maintenance; while saving manpower, material resources and financial resources, it ensures the long-term, stable and normal operation of air-requiring equipment.

[0011] In order to achieve the above object, the present invention provides the following technical solutions:

[0012] An air filter device with a rough inner wall is characterized in that it includes: a filter channel, both ends of the filter channel are non-closed structures, and a plurality of protrusions or pits are provided on the inner wall of the filter channel; a plurality of guide channels, the guide channels are fixed to the side of the filter channel and connected to the filter channel, the sum of the cross-sectional areas of each 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, and the angle α is less than 90°.

[0013] In the present invention, preferably, the cross-sectional shape of the protrusion is at least one of an arc, a triangle, and a quadrilateral.

[0014] In the present invention, preferably, the cross-sectional shape of the pit is at least one of an arc, a triangle, and a quadrilateral.

[0015] In the present invention, preferably, the guide channel includes an air hole provided on a side of the filter channel and a guide plate fixedly connected to an edge of the air hole.

[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 side surfaces of the filter channel are symmetrically connected to the guide channel.

[0018] In the present invention, preferably, a fan is installed at at least one end of the filter channel.

[0019] In the present invention, preferably, it also includes a shell, the guide channel, the filter channel and the part connected to the guide channel are all installed in the shell, the two ends of the filter channel extend out of the shell, and a clean air outlet is provided on the shell, and the number of the filter channels is one or more.

[0020] In the present invention, preferably, the angle α is 10° to 60°.

[0021] In the present invention, preferably, the filtration channel includes an expansion section and a tightening section, the two ends of the expansion section are respectively connected to the tightening sections, the cross-sectional area of the expansion section is larger than the cross-sectional area of the tightening section, the guide channel is fixed to the side of the expansion section, and the inner wall of the part where the expansion section is connected to the tightening section has an angle β with the inner wall of the tightening section, and the angle β is 1° to 30°.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The air filter device with a rough inner wall of the present invention is provided with a filter channel, and a guide channel is provided on the side of the filter channel. The air flow flows through the filter channel and the guide channel in sequence. After the air flows into the filter channel, a part of the air will enter the road channel. The guide channel guides out this part of the air, which is clean air. The clean air flows into the guide channel, and the miscellaneous dust at the center position is discharged back into the atmosphere under the entrainment of the air flow. When the air flow flows forward through the guide channel, the miscellaneous dust and the clean air are separated by themselves under the action of the special structure; protrusions or pits are provided on the inner wall of the filter channel to increase the surface friction, increase the static pressure on the inner wall, and make the impurities more stably located in the center position of the air flow in the filter channel. , making it more difficult to enter the guide channel. The air filter device with a rough inner wall can provide clean air more stably, which not only avoids the accumulated impurities from clogging the air filter device with a rough inner wall, but also saves the trouble of manually cleaning the air filter device with a rough inner wall, saving manpower, material and financial resources, and can ensure normal operation for a long time without cleaning, thereby supporting the operation of the internal combustion engine; the shell arranged on the outside of the guide channel can collect and transport the clean air to the designated area; a fan is set at the atmospheric inlet and / or impurity outlet to provide power for the air filter device with a rough inner wall, so that there is no need to rely on external power. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of an air filter device with a rough inner wall and a protrusion.

[0025] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0026] Figure 3 It is a schematic diagram of the structure of an air filter device with pits and a rough inner wall.

[0027] Figure 4 for Figure 3 Enlarged view of part B in the middle.

[0028] Figure 5 It is a structural schematic diagram of an air filter device with a rough inner wall and an arc-shaped guide vane.

[0029] Figure 6 for Figure 5 Enlarged view of part C in the middle.

[0030] Figure 7 It is a structural schematic diagram of an air filter device with a rough inner wall and provided with a broken line guide plate.

[0031] Figure 8 for Figure 7 Enlarged view of part D in the middle.

[0032] Figure 9 This is a schematic diagram of the structure of an air filter device with a rough inner wall and multiple groups of filter channels.

[0033] Figure 10 Schematic diagram of the end face of an air filter device with a square shell and multiple groups of filter channels with rough inner walls.

[0034] Figure 11 Schematic diagram of the end face of an air filter device with a circular shell and multiple groups of filter channels with rough inner walls.

[0035] Figure 12 The diagram is a structural diagram of an air filter device with a rough inner wall and an expansion section and a contraction section.

[0036] Figure 13 for Figure 12 Enlarged view of middle part E.

[0037] In the accompanying drawings: 1-filtration channel, 101-atmospheric inlet, 102-impurity outlet, 103-expansion section, 104-tightening section, 105-protrusion, 106-pit, 2-guide channel, 201-air hole, 202-guide plate, 203-arc-shaped guide plate, 204-broken line guide plate, 3-fan, 4-housing, 401-clean air outlet. DETAILED DESCRIPTION

[0038] 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 them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0039] 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.

[0040] 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.

[0041] Please also see Figures 1 to 13 A preferred embodiment of the present invention provides an air filtration device with a rough inner wall, including a filtration channel 1 and a plurality of guide channels 2.

[0042] In this embodiment, the filter channel 1 is a tubular structure, and its cross-section can be circular or square, or other unusual shapes, as long as it can form an inner cavity as the filter channel 1. A number of protrusions 105 or pits 106 are provided on the inner wall of the filter channel 1. The protrusions 105 or pits 106 can be provided continuously or at intervals. The number of protrusions 105 or pits 106 is not fixed. The inner wall of the filter channel 1 can be covered with protrusions 105 or pits 106, or some blank areas can be left. The function of the protrusions 105 or pits 106 is to make the inner wall of the filter channel 1 rougher, with the purpose of increasing the surface friction of the inner wall of the filter channel 1. Both ends of the filter channel 1 are not closed, but open, so that airflow can enter the filter channel 1 from one end and exit the filter channel 1 from the other end. The guide channel 2 is a structure that can guide airflow to flow in a certain direction. It can be a tubular structure or a simpler windshield. The guide channel 2 is fixedly connected to the side of the filter channel 1, and the guide channel 2 is connected to the filter channel 1.

[0043] The angle between the diversion channel 2 and the filter channel 1 is α, which is less than 90°. Here, the angle between the two should be understood as the angle between the overall shape of the diversion channel 2 and the filter channel 1. For example, if the diversion channel 2 is linear, then the angle between the straight line on which the diversion channel 2 is located and the straight line on which the filter channel 1 is located is angle α; for another example, if the diversion channel 2 is arc-shaped, then the angle between the tangent of the midpoint of the arc on which the diversion channel 2 is located and the straight line on which the filter channel 1 is located is angle α; for another example, if the diversion channel 2 is irregular in shape, then the angular trend of the angle between the overall shape of the diversion channel 2 and the filter channel 1 needs to be considered. For example, the angle between the tangent of each point of the irregular diversion channel 2 and the filter channel 1 can be taken as positive or negative angles, and the total angle obtained by summing up the various angles is angle α.

[0044] The two ends of filter channel 1 are respectively used for air intake and impurity discharge. The distribution depends on the direction of angle α. The end pointing to the vertex of angle α is impurity outlet 102 for impurity discharge, and the other end is atmosphere inlet 101 for outside air intake. The end of guide channel 2 connected to filter channel 1 is defined as the guide channel inlet, and the end not connected to filter channel 1 is defined as the guide channel outlet. Within filter channel 1, clean air enters guide channel 2 from the guide channel inlet and is discharged from the guide channel outlet.

[0045] Specifically, the operating principle of the air filter device with a rough inner wall is as follows: when there is a certain speed of airflow in the outside air, the atmospheric inlet 101 is directed toward the air flow direction, allowing the outside air to enter the filter channel 1 from the atmospheric inlet 101. The air entering the filter channel 1 contains impurities. Within the filter channel 1, the impurity-containing air flows toward the impurity outlet 102. When passing the location of the guide channel 2, some air will enter the guide channel 2 and flow out from the guide channel outlet. This part of the air is clean air.

[0046] Because the sum of the cross-sectional areas of each guide channel 2 is greater than that of the filter channel 1, and the friction of the airflow within the filter channel 1 and the guide channel 2 causes energy loss, the airflow velocity within the guide channel 2 is slower than that within the filter channel 1. Impurities such as sand, flocs, dust, and water droplets entrained in the airflow within the filter channel 1 tend to move from the atmospheric inlet 101 to the impurity outlet 102 under the influence of the two-directional airflow, while simultaneously moving from the center of the filter channel 1 toward the guide channel inlet. However, due to the weak attraction force at the guide channel 2, which cannot overcome the impurities' inertia, the airflow velocity within the filter channel 1 is greater than that within the guide channel 2. This allows the impurities to flow through the area of the filter channel 1 where the guide channels 2 are located before entering the guide channel 2, preventing them from entering the guide channel 2, thereby allowing the clean air and impurities to separate naturally. The ratio or difference between the airflow velocity within the guide channel 2 and the airflow velocity within the filter channel 1 can be adjusted by adjusting the difference in the cross-sectional areas of the two channels or by adding a power source such as a fan to the duct.

[0047] At the same time, the airflow within filter channel 1 exerts a strong dynamic pressure. When the high-pressure gas impacts the inner wall of guide channel 2, a high-pressure zone is created on the inner wall of guide channel 2. According to Bernoulli's principle, the airflow at the center of filter channel 1 experiences a high velocity but low static pressure. In contrast, the airflow in guide channel 2 and its surrounding areas around filter channel 1 experiences a certain amount of kinetic energy loss, resulting in a slow flow rate but high static pressure. To more stably remove impurities from the air, the inner wall of filter channel 1 is also provided with protrusions 105 or depressions 106. These rough surfaces increase friction between the airflow and the inner wall, resulting in a slower flow rate and higher static pressure compared to an inner wall without protrusions or depressions. In this situation, impurities such as particulate matter, flocs, and water droplets entrained in the airflow within filter channel 1 experience a significant pressure differential due to the unequal static pressure, causing them to shift toward the center of the airflow, where the static pressure is lower, rather than entering guide channel 2. Consequently, the impurities are smoothly discharged back into the atmosphere through impurity outlet 102 along with the airflow within the filter channel.

[0048] On the other hand, the air in the guide channel 2 flows obliquely rearward relative to the air in the filter channel 1, that is, the air in the guide channel 2 flows obliquely rearward at an angle α to the air flow direction in the filter channel 1. The airflow enters the guide channel entrance and flows obliquely rearward, which will form a static pressure at the guide channel entrance that is greater than the pressure of the center part of the airflow in the filter channel 1. This static pressure can push lighter impurities (such as flocs) near the guide channel entrance back to the center of the filter channel 1, preventing them from entering the guide channel 2. The lighter impurities will continue to move with the airflow toward the impurity outlet 102. If heavier impurities (such as sand particles) reach the guide channel entrance, they will hit the inner wall of the guide channel 2 due to their own inertia and be ejected back to the center of the filter channel 1, and keep moving toward the impurity outlet 102, instead of moving toward the guide channel 2 obliquely rearward.

[0049] After the above three processes, clean air without impurities can be discharged from the guide channel 2, while impurities such as particulate matter and floating objects are discharged from the impurity outlet 102 along with the air flow in the filter channel 1. In this way, clean air is obtained using an air filter device with a rough inner wall.

[0050] The size of the air filter device with a rough inner wall can be determined based on the space requiring clean air. For example, to provide clean air to a room, the air inlet 101 and impurity outlet 102 of the filter channel 1 of the air filter device with a rough inner wall need to extend outside the room, while the portion connected to the guide channel 2 is located inside the room. Of course, the air filter device with a rough inner wall also requires a high airflow rate, either naturally or artificially generated, to support its operation. For another example, to provide clean air to the interior of an electrical cabinet, the air inlet 101 and impurity outlet 102 of the filter channel 1 only need to extend outside the cabinet, while the portion connected to the guide channel 2 is located inside the cabinet. The required airflow can also be natural wind or artificial wind.

[0051] This device uses the airflow of the filter channel 1 itself to directly discharge impurities in the air, and uses the guide device to guide the clean air to the space where clean air is needed, thereby separating large particles, small particles and floating objects from the air. In addition, protrusions 105 or pits 106 are provided on the inner wall of the filter channel 1, which increases the surface friction and the static pressure on the inner wall, so that impurities are more stably located in the center of the airflow in the filter channel 1, making it more difficult to enter the guide channel 2. Therefore, this device can provide clean air more stably and can directly discharge impurities while delivering clean air, thereby avoiding the accumulated impurities from clogging the air filter device with a rough inner wall, and eliminating the trouble of manually cleaning the air filter device with a rough inner wall, saving manpower, material resources and financial resources.

[0052] In a preferred embodiment of the present invention, protrusions 105 are provided on the inner wall of the filter channel 1. The cross-sectional shape of these protrusions 105 can be one or more of an arc, a triangle, and a quadrilateral. By providing these various protrusions 105, the surface roughness of the inner wall of the filter channel 1 can be increased, thereby increasing friction and increasing the static pressure on the inner wall of the filter channel 1. This allows impurities to be more stably positioned at the center of the airflow within the filter channel 1, making it more difficult for them to enter the guide channel 2.

[0053] In a preferred embodiment of the present invention, pits 106 are provided on the inner wall of the filter channel 1. The cross-sectional shape of these pits 106 can be one or more of an arc, a triangle, or a quadrilateral. By providing these various pits 106, the surface roughness of the inner wall of the filter channel 1 can be increased, thereby increasing friction. This increases the static pressure on the inner wall of the filter channel 1, keeping impurities more stably located at the center of the airflow within the filter channel 1, making it more difficult for them to enter the guide channel 2.

[0054] In a preferred embodiment of the present invention, an air hole 201 is provided in the filter channel 1, and a guide plate 202 is connected to the edge of the air hole 201. In this case, the air hole 201 is the entrance of the guide channel, and the space between two adjacent guide plates 202 is the guide channel 2. The surface of the guide plate 202 contacts the clean air, so the surface of the guide plate 202 is the inner wall of the guide channel 2. The direction of the guide plate 202 determines the direction of the guide channel 2, so the angle between the guide plate 202 and the side of the filter channel 1 is the angle α. The shape of the guide plate 202 can be selected from a variety of options, including flat or curved surfaces, and can be rectangular, square, rhombus, trapezoidal, semicircular, etc. By providing the air hole 201 in the filter channel 1 and connecting the guide plate 202 along the edge of the air hole 201, the guide channel 2 can be connected to the side of the filter channel 1, thereby separating clean air from impurities. This simple structure is easy to implement.

[0055] In a preferred embodiment of the present invention, the guide vane 202 is linear, arc-shaped, or zigzag. When a linear guide vane is used, the angle between the guide vane 202 and the side of the filter channel 1 is angle α, and air flows along the linear guide vane as it passes through. When an arc-shaped guide vane 203 is used, the angle between the tangent at the midpoint of the arc-shaped guide vane 203 and the side of the filter channel 1 is angle α, and air flows along the arc-shaped guide vane 203 as it passes through, with its overall flow direction forming angle α with the filter channel 1. When a zigzag guide vane 204 is used, the portion of the zigzag guide vane 204 that is inclined toward the side of the filter channel 1 determines its overall direction, and the angle between the portion of the zigzag guide vane 204 that is inclined toward the side of the filter channel 1 is angle α. When air passes through, it first flows along the portion of the zigzag guide vane 204 that is inclined toward the side of the filter channel 1, then turns in a direction opposite to the airflow in the filter channel 1, and finally is discharged from the guide channel 2. The guide plates in the above-mentioned straight line, arc shape or broken line shape can form the guide channel 2 to achieve the separation of clean air and impurities, and the structure is simple and easy to implement.

[0056] In a preferred embodiment of the present invention, the side of the filter channel 1 is symmetrically connected with a guide channel 2. For example, if a plurality of guide channels 2 are connected to one side of the filter channel 1, the same number of guide channels 2 are also connected to the opposite side of the guide channel 2, so that the guide channels 2 are symmetrical with each other on the filter channel 1. In this case, there will be guide channels 2 in multiple directions in the filter channel 1 to guide the clean air out, and the airflow directions of these clean air guides are symmetrical, so that the impurities in the filter channel 1 are balanced in force and will not be particularly biased towards the direction of a certain guide channel 2. They can better move toward the impurity outlet 102 at the center of the filter channel 1. At the same time, the increase in the number of guide channels 2 can guide more clean air out. By symmetrically connecting the guide channels 2 on the filter channel 1, it is possible to achieve a more balanced force on the impurities in the filter channel 1 and better maintain them at the center of the filter channel 1. In addition, more guide channels 2 improve the efficiency of clean air export.

[0057] In a preferred embodiment of the present invention, a fan 3 is installed at at least one of the two ends of the filter channel 1, namely the atmospheric inlet 101 and the impurity outlet 102. The fans 3 installed at both locations can generate an airflow from the atmospheric inlet 101 to the impurity outlet 102. The normal operation of the air filter device with a rough inner wall requires an airflow from the atmospheric inlet 101 to the impurity outlet 102 in the filter channel 1. When there is an airflow that meets the requirements in the outside world, the air filter device with a rough inner wall can operate normally by simply turning the atmospheric inlet 101 toward the direction of the outside airflow. However, when there is no airflow that meets the requirements in the outside world, it is necessary to artificially create airflow to meet the needs of the air filter device with a rough inner wall. Installing a fan 3 at the atmospheric inlet 101 or the impurity outlet 102, or installing a fan 3 at both locations, allows the device to remove impurities and output clean air without relying on external airflow, and also achieves adjustable airflow speed, making the operation process more efficient.

[0058] In a preferred embodiment of the present invention, the air filter device with a rough inner wall also includes a shell 4, which is used to collect the clean air guided out of the guide channel 2 and uniformly transport it to a designated area. The shape and size of the shell 4 can be set as needed. The part where the filter channel 1 is connected to the guide channel 2 and the guide channel 2 are both installed in the shell 4. The two ends of the filter channel 1 extend out of the shell 4. The part where the filter channel 1 is connected to the shell 4 has a sealing structure, and the clean air will not leak from here. A clean air outlet 401 is provided on the shell 4 for transporting the clean air to a designated area. The clean air outlet 401 can be connected to an air pipeline. For example, the clean air outlet 401 is connected to the air intake of an internal combustion engine. The number of filter channels 1 and guide channels 2 is not fixed. For example, Figures 9 to 11 As shown, one or more sets of filter channels 1 and guide channels 2 can be arranged side by side in the housing 4. The housing 4 can be circular, square, or in various other shapes. The housing 4 can collect the clean air separated by each set of filter channels 1 and guide channels 2 and transport it out from the clean air outlet 401. A fan can also be installed at the air outlet 401 to adjust the flow rate of the clean air. By wrapping the guide channel 2 with the housing 4 that is arranged outside the guide channel 2, the clean air can be transported to a designated area through the clean air outlet 401, making the use of the air filter device with a rough inner wall more convenient and applicable to more occasions.

[0059] In a preferred embodiment of the present invention, the angle α is between 10° and 60°, such as 15°, 25°, 35°, 40°, 59°, etc. Although an angle α of less than 90° can achieve the effect of air flowing obliquely backward after entering the guide channel entrance, the dust removal effect is not ideal when the angle α is larger. The airflow velocity in the guide channel 2 is a vector, which can be regarded as consisting of a first vector opposite to the direction of the airflow in the filter channel 1 and a second vector perpendicular to the direction of the airflow in the filter channel 1. When the angle α is large, the first vector is small and the second vector is large, then the guide channel 2 has a stronger attraction for impurities, and impurities are easily discharged from the guide channel 2, resulting in poor separation effect between air and impurities. Therefore, the angle α should be small, and the best choice is not more than 60°. When the angle α is extremely small, the first vector is extremely large and the second vector is extremely small, making it difficult for air to flow into the guide channel 2, making it impossible to discharge clean air. Therefore, the angle α cannot be too small, and the best choice is not less than 10°. By setting the angle α between 10° and 60°, impurities are unlikely to enter the guide channel 2 , while clean air can easily enter the guide channel 2 , thereby achieving a better effect of separating air from impurities.

[0060] In a preferred embodiment of the present invention, the filter channel 1 includes an expansion section 103 and a tightening section 104. The cross-sectional area of the expansion section 103 is larger than that of the tightening section 104. The tightening section 104 consists of two sections, connected to the expansion section 103 at either end. Specifically, the atmosphere inlet 101 and impurity outlet 102 of the filter channel 1 are directly connected to the tightening section 104, while the expansion section 103 is connected between the two tightening sections 104. All of the diversion channels 2 are fixed to the sides of the expansion section 103, while no diversion channels 2 are provided on the sides of the tightening section 104. The portion connecting the expansion section 103 and the tightening section 104 serves as a transition between two sections of the filter channel 1 with different cross-sectional areas. Therefore, the inner wall of this portion inevitably forms an angle with the inner wall of the tightening section 104. For ease of description, the positional relationship between these two surfaces is described by the angle between these two surfaces, which is defined as angle β and is less than 90°. When air flows through the tightening section 104, the airflow is faster due to the smaller cross-sectional area of the tightening section 104, which can provide a faster speed for impurities. When the air flows to the expansion section 103, the impurities are relatively far away from the entrance of the guide channel due to the larger cross-sectional area of the expansion section 103, and the airflow is slower. However, the impurities previously had a faster speed. Due to the effect of inertia, they can still maintain a faster speed through the expansion section 103 in the expansion section 103, thereby minimizing the time it takes for impurities to pass through the expansion section 103 and reducing the probability of impurities entering the guide channel 2. However, if an inclined inner wall is not provided between the tightening section 104 and the expansion section 103 for transition, when the air flows from the tightening section 104 to the expansion section 103, the air will separate from the inner wall of the expansion section 103, and the amount of clean air discharged by the guide channel 2 will decrease. When the air flows from the expansion section 103 to the tightening section 104, a vortex will be generated at the connection between the expansion section 103 and the tightening section 104, blocking the air flow and thus affecting the discharge of impurities. Therefore, the portion where the expansion section 103 and the tightening section 104 are connected should have a transitional shape, that is, the angle β should be less than 90°, so that the air is as close to the inner wall of the expansion section 103 as possible, minimizing the generation of vortices or making the generated vortices as small as possible.

[0061] The optimal range of angle β is 1° to 30°, such as 10°, 20°, 30°, etc. The smoother the transition between the expansion section 103 and the tightening section 104, the better the air adheres to the inner wall, and the less likely vortices are to be generated. Even if vortices are generated, the vortices are smaller. Therefore, when the angle β is 1° to 30°, the air in the filter channel 1 adheres to the inner wall well, and the impact of vortices is minimal, thereby achieving the effect of improving impurity removal while substantially not reducing the efficiency of the clean air discharged from the guide channel 2.

[0062] By setting the filter channel 1 into a structure in which an expansion section 103 and a tightening section 104 are connected, and the angle β between the portion where the expansion section 103 and the tightening section 104 are connected and the tightening section 104 is 1° to 30°, the probability of impurities entering the guide channel 2 can be further reduced, the impurity removal effect can be improved, and the efficiency of the guide channel 2 in extracting clean air is limited, and the overall air filtering effect is still good.

[0063] 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. An air filter device having a rough inner wall, characterized in that: include: A filter channel, both ends of which are non-enclosed structures, and the inner wall of the filter channel is provided with a plurality of protrusions or pits; A plurality of guide channels, wherein the guide channel is fixed to the side of the filter channel and is connected to 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 channel and the filter channel have an angle α, the angle α is less than 90°, the guide channel includes an air hole provided on the side of the filter channel and a guide plate fixedly connected to the edge of the air hole, the guide plate is straight, arc-shaped or broken line-shaped, at least one end of the filter channel is installed with a fan, the guide channel, the filter channel and the guide channel are connected to the filter channel. The parts connected with the filter channels are all installed in the shell, the two ends of the filter channel extend out of the shell, the shell is provided with a clean air outlet, the number of the filter channels is one or more, the filter channel includes an expansion section and a tightening section, the two ends of the expansion section are respectively connected to the tightening section, the cross-sectional area of the expansion section is larger than the cross-sectional area of the tightening section, the guide channel is fixed to the side of the expansion section, the inner wall of the part where the expansion section is connected to the tightening section has an angle β with the inner wall of the tightening section, and the angle β is 1° to 30°.

2. The air filter device with a rough inner wall according to claim 1, characterized in that: The cross-sectional shape of the protrusion is at least one of an arc, a triangle, and a quadrilateral.

3. The air filter device with a rough inner wall according to claim 1, characterized in that: The cross-sectional shape of the pit is at least one of an arc, a triangle, and a quadrilateral.

4. The air filter device with a rough inner wall according to claim 1, characterized in that: The angle α is 10° to 60°.

Images