Air filter with ejection dust collection device

Abstract

The present invention provides an air filter with an ejection dust collection device, comprising a group of filter units or two or more groups of filter units nested in layers; the filter units include a first filter tube and a second filter tube nested thereon; the first filter tube of the innermost filter unit is configured as a hollow tube with one end closed and the other end open; the edge of the first filter tube is axially bent and connected to one end of the second filter tube to form a filter zone; the other end of the second filter tube is axially bent and connected to the first filter tube of an adjacent filter unit outside it to form a clean air zone; the inner cavity of the first filter tube is connected to the clean air zone; the inner wall of the first filter tube and the outer wall of the second filter tube are provided with a plurality of guide plates to form a clean air flow channel; the air inlet is open to external air to form a main channel; the ends of the second filter tubes away from the air inlet are connected to each other; and the second filter tubes are connected to an ejection assembly. The present invention can actively separate and filter mixed air flows containing impurities, solving the problem of filters near the outlet being prone to clogging.

Description

Technical Field

[0001] The invention relates to the technical field of air purification, in particular to an air filter with an ejection dust collecting device. Background Art

[0002] An air filter is a filter, also called an air filter cartridge, style, or air filter element. It is widely used in daily life, industrial production, transportation, military equipment, and other fields. When the air entering the equipment contains impurities such as sand, dust, and debris, the impurities will cause wear on the equipment and shorten the service life of the equipment. In order to prevent impurities from entering the equipment, an air filter is generally installed in the air supply channel of the equipment. According to the filtration principle, air filters can be divided into filter type, centrifugal type, oil bath type, and composite type. The common devices used for air filtration often use cyclones.

[0003] Traditional cyclones use centrifugal force to separate solid particles or liquid droplets from airflow. While they can filter dense sand and dust, they are ineffective against small dust particles or particles with low specific gravity, especially floating objects such as plant debris, catkins, and poplar fluff, which are most likely to clog the secondary fine filter. Specifically, these air filters have the following problems in terms of air filtration effectiveness:

[0004] 1. When the airflow rotates at high speed, the centrifugal force generated sticks to the wall of the cyclone, and at the same time, the corresponding wall pressure is generated on the wall of the cyclone. Under the dual action of centrifugal force and wall pressure, dust of different specific gravity and volume is located at different positions on the wall of the cyclone. Only debris such as sand can approach the wall and be settled; other dust refuses to approach, which greatly reduces the dust removal effect and makes the dust removal effect random.

[0005] 2. On the one hand, light impurities such as catkins tend to accumulate near the outlet, and a large thrust is required to push the dust out of the outlet. On the other hand, the horizontal arrangement of the filter makes the dust sedimentation effect poor. With the long-term use of the air filter, these will cause the part of the pipe wall near the outlet to be prone to serious blockage problems.

[0006] 3. Traditional filtration methods, such as metal mesh filters, fiber filters, and paper filters, are essentially passive adsorption filters. This type of filtration has two potential outcomes: dust passes through the filter, rendering it ineffective; or dust is trapped on the filter, gradually clogging the airflow path and reducing air intake. This filtration method requires frequent filter element replacement, which is time-consuming and labor-intensive. The material cost of using a large number of filter elements is also high. In emergency situations, insufficient time for cleaning or replacement can affect the normal operation of the equipment and even lead to serious accidents.

[0007] 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

[0008] In view of this, the problem to be solved by the present invention is to provide an air filter with an ejection dust collection device.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is: an air filter with an ejection dust collection device, comprising a group of filter units or two or more groups of filter units nested in layers;

[0010] The filter unit includes a first filter tube and a second filter tube sleeved on the outside of the first filter tube. The first filter tube of the innermost filter unit is configured as a hollow tube with one end closed and the other end open. The edge end of the first filter tube is axially bent and connected to one end of the second filter tube to form a filter area. The other end of the second filter tube is axially bent and connected to the first filter tube of the filter unit adjacent to its outside to form a clean air area. The inner cavity of the first filter tube is connected to the clean air area. The inner wall of the first filter tube and the outer wall of the second filter tube are provided with a plurality of guide plates to form a clean air flow channel. The guide plates are arranged obliquely facing the air inlet of the filter area. The air inlet is connected to External air is passed through the filter to form a main channel, and the side walls of the second filter tube at one end away from the air inlet are connected to each other. A dust storage chamber is provided at the bottom of the filter unit. The second filter tube is connected to an ejection component for discharging dust. The ejection component includes a throat, a collecting pipe section and an ejection pipe. The throat pipe is connected to the filter area, and the throat pipe is connected to one end of the collecting pipe section. A collecting port is provided at the other end of the collecting pipe section. The collecting port is connected to the dust exhaust pipe, and the radial dimension of the collecting port is smaller than the radial dimension of the connection between the throat pipe and the collecting pipe section. The ejection pipe is provided in the throat pipe to form a negative pressure area to move the dust in the filter area to the collecting port.

[0011] In the present invention, preferably, the size of one end of the dust storage chamber away from the air inlet is smaller than the size of the filtration area.

[0012] In the present invention, preferably, each group of the filtering units is provided with an air-solid separator, and the air-solid separator is fixed on the outer wall of the first filter tube and the inner wall of the second filter tube, so that the external air in the filtering area is maintained in a balanced state by the static pressure from the first filter tube and the second filter tube.

[0013] In the present invention, preferably, the gas-solid separator is configured as a plurality of protrusions, and the cross-sectional shape of the protrusions is configured to be an arc, a triangle or a trapezoid.

[0014] In the present invention, preferably, contraction pipe sections are fixedly provided on both sides of the guide plate, and the size of the connection between the contraction pipe section and the gas-solid separator is smaller than the size of the connection between the contraction pipe section and the guide plate.

[0015] In the present invention, preferably, the angles formed by the cross-section of the tube wall of the contraction tube section, the cross-section of the tube wall of the first filter tube, and the cross-section of the tube wall of the second filter tube are acute angles.

[0016] In the present invention, preferably, the filter units are coaxially arranged vertically, and the second filter tube of the inner filter unit is sleeved on the outside of the first filter tube of the filter unit in the same group, and is sleeved on the inside of the first filter tube of the filter unit in the adjacent outer layer.

[0017] In the present invention, preferably, the second filter tube and the first filter tube of the same filter unit group are coaxially arranged, and the guide plates are centrally symmetrically arranged about the central axis of the innermost first filter tube.

[0018] In the present invention, preferably, an induced draft fan for extracting dust is arranged opposite the collecting port, a blower for sucking external air into the filtration zone is provided at the air inlet of the filtration zone, and an induced draft fan for promoting the discharge of clean air is provided at the air outlet of the clean air zone.

[0019] In the present invention, preferably, the induced draft fan, the blower and the induced draft fan are all configured as axial flow fans.

[0020] In the present invention, preferably, the guide plate includes an airfoil-shaped guide surface and an accelerating guide surface, and the accelerating guide surface is a concave arc structure.

[0021] The advantages and positive effects of the present invention are:

[0022] (1) By setting an ejector assembly including a throat pipe, a collecting pipe section, and an ejector pipe, one end of the throat pipe is connected to the engine exhaust pipe, and the other end of the throat pipe is connected to one end of the collecting pipe section. A collecting port is opened at the other end of the collecting pipe section. The radial size of the collecting port is smaller than the radial size of the connection between the throat pipe and the collecting pipe section. The ejector pipe passes through the throat pipe to suck dust into the collecting port. The exhaust pipe introduces the exhaust gas discharged from the engine into the throat pipe through the ejector pipe. The tightening structure of the collecting pipe section forms a negative pressure area at the connection between the throat pipe and the collecting pipe section, and the dust at the outlet is discharged to the collecting port through the collecting pipe section. The ejector assembly is set to facilitate the smooth discharge of dust back to the atmosphere, thereby solving the problem that dust accumulates near the outlet for a long time and is prone to blockage. The energy generated by the exhaust gas discharge from the exhaust pipe is effectively utilized, saving energy to a certain extent.

[0023] (2) External air is introduced through the air inlet of the filter area to form a main channel for the external air to pass through, and a clean air flow channel is formed between the guide plates. Since the flow velocity of the main channel in the filter area is greater than the flow velocity of the clean air flow channel, according to the Bernoulli principle, it can be concluded that the air flow velocity at the center of the main channel is fast and the static pressure is small, while the air flow velocity near the guide plates on both sides of the main channel is slow and the static pressure is large. At this time, the dust particles entrained on the contour line generate a pressure difference under the action of unequal static pressure, and the dust particles near the guide plates are pushed to the center of the main channel. The dust particles are separated from the clean air at the air inlet, and the clean air enters the engine's intake system through the guide plates. Compared with the traditional cyclone structure, the dust removal effect is improved.

[0024] (3) The gas-solid separator provided can increase the contact area between the outer wall of the first filter tube and the inner wall of the second filter tube and the particulate impurities, thereby increasing the friction. The particulate matter passing through the gas-solid separator moves in a direction away from the gas-solid separator due to the influence of the pressure difference, so that the movement trajectory of the particulate matter is concentrated in the middle of the filtration area, solving the problem that a small amount of particulate matter may hit the guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 This is a front structural cross-sectional view of a first embodiment of an air filter with an ejection dust collection device according to the present invention;

[0027] Figure 2 This is a side structural cross-sectional view of Example 1 of an air filter with an ejection dust collection device according to the present invention;

[0028] Figure 3 1 is a schematic side structural diagram of a filter unit of a first embodiment of an air filter with an ejection dust collection device according to the present invention;

[0029] Figure 4 1. It is a structural schematic diagram of an induced draft fan of a first embodiment of an air cleaner with an ejection dust collecting device according to the present invention;

[0030] Figure 5 1 is a top view of a first embodiment of an air filter with an ejection dust collecting device according to the present invention;

[0031] Figure 6 1. It is a bottom view of the first embodiment of an air filter with an ejection dust collecting device according to the present invention;

[0032] Figure 71 is a schematic structural diagram of an ejection assembly of a first embodiment of an air filter with an ejection dust collecting device according to the present invention;

[0033] Figure 8 This is a schematic structural diagram of a guide plate of a second embodiment of an air filter with an ejection dust collection device according to the present invention;

[0034] Figure 9 1 is a schematic structural diagram of an air-solid separator of a third embodiment of an air filter with an ejection dust collecting device according to the present invention;

[0035] Figure 10 1 is a schematic structural diagram of an air-solid separator of a fourth embodiment of an air filter with an ejection dust collecting device according to the present invention;

[0036] Figure 11 1 is a schematic structural diagram of an air-solid separator of a fifth embodiment of an air filter with an ejection dust collecting device according to the present invention;

[0037] Figure 12 1 is a schematic structural diagram of a contraction pipe section of a sixth embodiment of an air filter with an ejection dust collection device according to the present invention;

[0038] Figure 13 1 is a schematic structural diagram of an induced draft fan of a first embodiment of an air cleaner with an ejection dust collecting device according to the present invention;

[0039] Figure 14 The present invention is a schematic structural diagram of a main channel and a clean air flow channel of an air filter with an ejection dust collection device.

[0040] In the figure: 1. Filtration unit; 11. First filter tube; 12. Second filter tube; 13. Filtration zone; 14. Clean air zone; 15. Guide plate; 151. Airfoil guide surface; 152. Acceleration guide surface; 16. Clean air flow channel; 17. Main channel; 2. Dust exhaust pipe; 3. Ejector assembly; Throat pipe 31. Throat pipe; 32. Collecting pipe section; 33. Ejector pipe; 34. Collecting port; 4. Dust accumulation chamber; 5. Gas-solid separator; 51. Protrusion; 6. Contraction pipe section; 7. Ejector fan; 8. Blower; 9. Induced draft fan. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Example 1:

[0045] like Figures 1 to 7 As shown, the present invention provides an air filter with an ejection dust collection device, comprising a set of filter units 1 or two or more sets of filter units 1 stacked in layers;

[0046] The filter unit 1 includes a first filter tube 11 and a second filter tube 12 sleeved on the outside of the first filter tube 11. The first filter tube 11 of the innermost filter unit 1 is configured as a hollow tube with one end closed and the other end open. The edge end of the first filter tube 11 is axially bent and connected to one end of the second filter tube 12 to form a filter area 13. The other end of the second filter tube 12 is axially bent and connected to the first filter tube 11 of the adjacent filter unit 1 on its outside to form a clean air area 14. The inner cavity of the first filter tube 11 is connected to the clean air area 14. The inner wall of the first filter tube 11 and the outer wall of the second filter tube 12 are provided with a plurality of guide plates 15 to form a clean air flow channel 16. The guide plates 15 are arranged obliquely facing the air inlet of the filter area 13, and the air inlet is passed into the mixed air to be filtered. The mixture is formed to form a main channel 17 for the mixture to be filtered to pass through. The side walls of the second filter tubes 12 of each layer of the filter unit 1 at one end away from the air inlet are connected to each other. The bottom of the filter unit 1 is provided with a dust storage chamber 4; the specific working process of the filter is that when working, the operator first turns on the blower 8 set at the air inlet of the filter area 13. The blower 8 serves as the power unit of the filter, providing an airflow from the air inlet to the filter area 13, and carrying the external air into the filter area 13 from the air inlet. The external air includes impurities such as catkins, sand particles, dust particles, and plant debris. The air inlet of the filter area 13 is introduced into the external air to form a main channel 17 for the external air to pass through. The clean air flow channel 16 is formed between the guide plates 15. Since the flow rate of the main channel 17 in the filter area 13 is greater than the flow rate of the clean air flow channel 16, the suction force generated by the clean air flow channel 16 cannot overcome the self-inertia of the dust particles in the external air, so the dust particles cannot be sucked into the clean air flow channel 16 formed between the guide plates 15, and the gas and solid are actively separated. The clean air reaches the clean air area 14 through the clean air flow channel 16, and the dust particles are discharged back to the atmosphere through the dust exhaust pipe 2 along the filter area 13 under the action of the airflow in the main channel 17; when the dust particles with higher density approach the guide plate 15 along the main channel 17, they hit the inclined surface of the guide plate 15 due to their own inertia and are ejected, return to the main channel 17 and merge into the filter area 13. The airflow is discharged back to the atmosphere through the dust exhaust pipe 2; the airflow in the filtration area 13 has a large dynamic pressure under the promotion of the blower 8. When the high-pressure airflow hits the inclined surface of the guide plate 15, a high-pressure area is formed at the acceleration guide surface 82. According to the Bernoulli principle, it can be concluded that the airflow velocity at the center of the main channel 17 is fast and the static pressure is small. However, the airflow velocity near the guide plates 15 on both sides of the main channel 17 is slow and the static pressure is large. At this time, the dust particles entrained on the contour line produce a pressure difference under the action of unequal static pressure. The dust particles near the guide plates 15 are pushed to the center of the main channel 17, and the dust particles are separated from the clean air at the air inlet. The clean air enters the engine's intake system through the guide plates 15.By setting up the filter unit 1, particulate impurities can be actively separated from the intake air flow. Compared with the traditional cyclone structure, the dust removal effect is significantly improved. It is not affected by the inherent properties of the specific gravity and volume of dust particles and can be smoothly discharged back into the atmosphere.

[0047] The second filter tube 12 is connected to an ejection assembly 3 for guiding dust discharge. The ejection assembly 3 includes a throat pipe 31, a collecting pipe section 32 and an ejection pipe 33. One end of the throat pipe 31 is connected to the engine exhaust pipe, and the other end of the throat pipe 31 is connected to one end of the collecting pipe section 32. A collecting port 34 is provided at the other end of the collecting pipe section 32. The radial dimension of the collecting port 34 is smaller than the radial dimension of the connection between the throat pipe 31 and the collecting pipe section 32. The ejection pipe 33 passes through the throat pipe 31 to suck dust into the collecting port 34. Since one end of the throat pipe 31 is connected to the engine exhaust pipe, the exhaust pipe introduces the exhaust gas discharged by the engine into the throat pipe 31 through the ejector pipe 33. The tightening structure of the collecting pipe section 32 forms a negative pressure area at the connection between the throat pipe 31 and the collecting pipe section 32, and discharges the dust at the outlet to the collecting port 34 through the collecting pipe section 32. By setting the ejector assembly 3, the dust is easily discharged back into the atmosphere, which solves the problem that dust accumulates near the outlet and is prone to blockage during long-term operation, and effectively utilizes the energy generated by the exhaust gas discharge of the exhaust pipe, saving energy to a certain extent.

[0048] In this embodiment, the size of the dust chamber 4 at one end away from the air inlet is smaller than that of the filter area 13. Since the dust chamber 4 is configured to be tightened from the air inlet toward the direction away from the air inlet, the cross-sectional area of the dust chamber 4 becomes smaller, and the pressure required for dust discharge also becomes smaller, making it easier for dust to be discharged smoothly and more thoroughly discharged back into the atmosphere.

[0049] In this embodiment, each filter unit 1 is further provided with an air-solid separator 5, which is fixed to the outer wall of the first filter tube 11 and the inner wall of the second filter tube 12, so that the external air in the filter area 13 is maintained in a balanced state by the static pressure from the first filter tube 11 and the second filter tube 12. The provision of the air-solid separator 5 can increase the contact area between the outer wall of the first filter tube 11 and the inner wall of the second filter tube 12 and the particulate impurities, thereby increasing the friction. The particulate matter passing through the air-solid separator 5 moves in a direction away from the air-solid separator 5 due to the influence of the pressure difference, so that the movement trajectory of the particulate matter is concentrated in the middle of the filter area 13, solving the problem that a small amount of particulate matter may hit the guide plate 15.

[0050] In this embodiment, the filter units 1 are further arranged coaxially and vertically, with the second filter tubes 12 of the inner filter units 1 being sleeved outside the first filter tubes 11 of the same group of filter units 1, and sleeved inside the first filter tubes 11 of the adjacent outer filter units 1. By arranging the filter units 1 coaxially and vertically, particulate matter and impurities fall by their own weight, resulting in a better settling effect than a horizontally positioned filter. Furthermore, the coaxial arrangement of several groups of filter units 1 effectively saves filtration space, resulting in a rational structural layout and a dense space that improves filtration effectiveness.

[0051] In this embodiment, the second filter tube 12 and the first filter tube 11 of the same filter unit group are coaxially arranged, and the guide plate 15 is centrally symmetrically arranged with respect to the central axis of the innermost first filter tube 11 , so as to facilitate the clean air to smoothly reach the clean air zone 14 .

[0052] In this embodiment, further, an induced draft fan 7 for extracting dust is arranged opposite the collecting port 34, a blower 8 for sucking external air into the filter area 13 is provided at the air inlet of the filter area 13, and an induced draft fan 9 for promoting the discharge of clean air is provided at the air outlet of the clean air area 14. The wind speed provided by the blower 8 is greater than the wind speed provided by the induced draft fan 9. Figure 13 As shown, the induced draft fan 7, the blower 8 and the induced draft fan 9 are all configured as axial flow fans or fans with the same function of providing axial wind force for the filtration unit 1. The specific model specifications need to be selected and determined based on the actual specifications of the device. The selection process adopts the existing technology in this field, so it will not be repeated here.

[0053] Example 2:

[0054] The difference between this embodiment and the first embodiment is that the guide plate 15 includes an airfoil guide surface 151 and an acceleration guide surface 152. The specific structure is as follows: Figure 8As shown, the airfoil guide surface 151 forms a small angle with the airflow in the main channel 17, imparting a certain amount of headwind resistance to the airflow, thereby accelerating its speed and reducing its pressure. However, considering the influence of the active air suction of the blower 8, the angle can be appropriately increased. However, the principle is that the airflow in the main channel 17 and the airfoil guide surface 151 will not separate during intake, maximizing the flow into the clean air flow channel 16. The interaction between the geometric position of the acceleration guide surface 152 and the adjacent guide plate 15 forms the clean air zone 14. By adjusting the angle and shape of the acceleration guide surface 152 in relation to the acceleration guide surface 152, the ratio between the external airflow velocity and the airflow velocity entering the main ventilation channel is adjusted. At the same time, the angle at which the airflow enters the main channel is adjusted, thereby distributing the ratio between the airflow in the main channel 17 and the airflow in the air inlet. The accelerating guide surface 152 is configured to have a convex arc structure. This is because when wind passes through the accelerating guide surface 152 with a concave arc structure, eddies will be generated locally, blocking and changing the direction of the wind, which is not conducive to the guiding effect of the accelerating guide surface 152 on the clean air. The accelerating guide surface 152 with a convex arc structure can reduce the influence of the eddies brought by the concave arc structure, improve the guiding effect of the accelerating guide surface 152, and thus promote the separation of clean air and dust particles.

[0055] Example 3:

[0056] In this embodiment, the gas-solid separator 5 is provided with a plurality of protrusions 51, and the cross-sectional shape of the protrusions 51 is provided with an arc shape. The specific structure is as follows: Figure 9 As shown, the arc-shaped protrusion 51 can increase the contact area between the inner wall of the filter tube and the particulate impurities, thereby increasing the friction between the two. The particulate matter passing through the gas-solid separator 5 is affected by the pressure difference, and its movement trajectory moves away from the direction of the gas-solid separator 5, thereby approaching and concentrating in the middle of the filtration area 13, solving the problem that a small amount of particulate matter may hit the guide plate 15, thereby avoiding the accumulation of impurities on the guide plate 15, which may cause the guide plate 15 to be blocked and reduce the filtration efficiency.

[0057] Example 4:

[0058] The difference between this embodiment and the third embodiment is that the cross-sectional shape of the protrusion 51 is set to be a triangle. The specific structure is as follows: Figure 10 As shown, the triangular protrusion 51 has a more compact spatial arrangement in the structural design, which increases the contact area between the inner wall of the filter tube and the particulate impurities, thereby increasing the friction between the two. The particles passing through the gas-solid separator 5 are subjected to the pressure difference, and their movement trajectory moves away from the direction of the gas-solid separator 5, thereby approaching and concentrating in the middle of the filtration area 13, and the structural layout is reasonable.

[0059] Embodiment 5:

[0060] The difference between this embodiment and the fourth embodiment is that the cross-sectional shape of the protrusion 51 is set to be trapezoidal. The specific structure is as follows: Figure 11 As shown, the contact area between the inner wall of the filter tube and the particulate impurities is increased, thereby increasing the friction and avoiding the interference of the triangular protrusion 51 on the main channel 17. The particulate matter passing through the gas-solid separator 5 moves away from the direction of the gas-solid separator 5 due to the pressure difference, thereby approaching and concentrating in the middle of the filtration area 13, so as to facilitate the mixture to pass through the filtration area 13 smoothly.

[0061] Example 6:

[0062] In order to enhance the separation of dust and air, in this embodiment, further, the two sides of the guide plate 15 are fixed with contraction tube sections 6, the specific structure is as follows: Figure 12 As shown, the size of the connection between the contraction pipe section 6 and the gas-solid separator 5 is smaller than the size of the connection between the contraction pipe section 6 and the guide plate 15. The angles formed by the tube wall cross-section of the contraction pipe section 6 and the tube wall cross-sections of the first filter tube 11 and the second filter tube 12 are acute angles. By setting the contraction pipe section 6, it is possible to avoid the generation of vortices in the airflow. The clean air follows the inner wall of the contraction pipe section 6 to reach the clean air flow channel 16 of the guide plate 15, so that the clean air flow smoothly passes through the clean air zone 14 along the contraction pipe section 6 and is separated from the dust, so that the dust is kept away from the guide plate 15, thereby facilitating the smooth discharge of dust particles.

[0063] The working principle and working process of the present invention are as follows: when working, the operator first turns on the blower 8 set at the air inlet of the filter area 13. The blower 8 serves as the power unit of the filter, providing an airflow from the air inlet to the direction of the filter area 13, and carrying the external air into the filter area 13 from the air inlet. The external air includes impurities such as catkins, sand particles, dust particles, plant debris, etc. The air inlet of the filter area 13 is passed with external air to form a main channel 17 for the passage of external air, and a clean air flow channel 16 is formed between the guide plates 15. Since the flow rate of the main channel 17 in the filter area 13 is greater than the flow rate of the clean air flow channel 16, the suction force generated by the clean air flow channel 16 cannot overcome the self-inertia of the dust particles in the external air, and thus the dust particles cannot be sucked into the clean air flow channel 16 formed between the guide plates 15. Figure 14As shown, gas and solid are actively separated, clean air reaches the clean air zone 14 through the clean air flow channel 16, and dust particles are discharged back to the atmosphere through the dust exhaust pipe 2 along the filter area 13 under the action of the airflow in the main channel 17; when dust particles with higher density approach the guide plate 15 along the main channel 17, they hit the inclined surface of the guide plate 15 due to their own inertia and are ejected, return to the main channel 17 and merge into the filter area 13 and are discharged back to the atmosphere through the dust exhaust pipe 2; the airflow in the filter area 13 has a large dynamic pressure under the push of the blower 8, and when the high-pressure airflow hits the inclined surface of the guide plate 15 At this time, a high-pressure area is formed at the acceleration guide surface 82. According to Bernoulli's principle, it can be concluded that the airflow velocity at the center of the main channel 17 is fast and the static pressure is small. However, the airflow velocity near the guide plates 15 on both sides of the main channel 17 is slow and the static pressure is large. At this time, the dust particles entrained on the contour line produce a pressure difference under the action of unequal static pressure. The dust particles near the guide plates 15 are pushed to the center of the main channel 17, and the dust particles are separated from the clean air at the air inlet. The clean air enters the engine's intake system through the guide plates 15. Compared with the traditional cyclone structure, the dust removal effect is improved.

[0064] The second filter tube 12 is connected to an ejection assembly 3 for guiding dust discharge. The ejection assembly 3 includes a throat pipe 31, a collecting pipe section 32 and an ejection pipe 33. One end of the throat pipe 31 is connected to the engine exhaust pipe, and the other end of the throat pipe 31 is connected to one end of the collecting pipe section 32. A collecting port 34 is provided at the other end of the collecting pipe section 32. The radial dimension of the collecting port 34 is smaller than the radial dimension of the connection between the throat pipe 31 and the collecting pipe section 32. The ejection pipe 33 passes through the throat pipe 31 to suck dust into the collecting port 34. Since one end of the throat pipe 31 is connected to the engine exhaust pipe, the exhaust pipe introduces the exhaust gas discharged by the engine into the throat pipe 31 through the ejector pipe 33. The tightening structure of the collecting pipe section 32 forms a negative pressure area at the connection between the throat pipe 31 and the collecting pipe section 32, and the dust at the outlet is discharged to the collecting port 34 through the collecting pipe section 32. The ejector assembly 3 is provided to facilitate the smooth discharge of dust back to the atmosphere, solving the problem of dust accumulation near the outlet and prone to blockage after long-term operation. It also effectively utilizes the energy generated by the exhaust gas discharge of the exhaust pipe, saving energy to a certain extent. The present invention can actively separate particulate impurities from the intake air flow by providing a filter unit 1, replacing the original cyclone's passive adsorption dust removal structure. The dust removal efficiency is high and is not affected by the inherent properties of the specific gravity and volume of the dust particles. All can be smoothly discharged back to the atmosphere. The device has a simple structure, stable and reliable performance, and is durable.

[0065] The above embodiments of the present invention are described in detail, but the contents are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of this patent.

Claims

1. An air filter with an ejection dust collection device, characterized in that: It comprises a set of filter units (1) or two or more sets of filter units (1) nested in layers; The filter unit (1) comprises a first filter tube (11) and a second filter tube (12) sleeved on the outside of the first filter tube (11); the first filter tube (11) of the innermost filter unit (1) is configured as a hollow tube with one end closed and the other end open; the edge of the first filter tube (11) is axially bent and connected to one end of the second filter tube (12) to form a filter area (13); the other end of the second filter tube (12) is axially bent and connected to the first filter tube (11) of the filter unit (1) adjacent to the outside thereof to form a clean air area (13); 4), the inner cavity of the first filter tube (11) is communicated with the clean air zone (14), the inner wall of the first filter tube (11) and the outer wall of the second filter tube (12) are provided with a plurality of guide plates (15) to form a clean air flow channel (16), the guide plates (15) are arranged obliquely facing the air inlet of the filtration zone (13), the air inlet is introduced into the outside air to form a main channel (17), the side walls of the second filter tube (12) at one end away from the air inlet are communicated with each other, and a dust storage chamber (4) is provided at the bottom of the filtration unit (1); The second filter tube (12) is connected to an ejector assembly (3) for discharging dust; the ejector assembly comprises a throat pipe, a collecting pipe section, and an ejector pipe; one end of the throat pipe is connected to the engine exhaust pipe, the other end of the throat pipe is connected to one end of the collecting pipe section, the other end of the collecting pipe section is provided with a collecting port, the radial dimension of the collecting port is smaller than the radial dimension of the connection between the throat pipe and the collecting pipe section, and the ejector pipe passes through the throat pipe to suck dust into the collecting port; Each group of the filter units (1) is provided with an air-solid separator (5), and the air-solid separator (5) is fixedly mounted on the outer wall of the first filter tube (11) and the inner wall of the second filter tube (12), so that the external air in the filter area (13) is subjected to static pressure from the first filter tube (11) and the second filter tube (12) to maintain a balanced state; The gas-solid separator (5) is configured as a plurality of protrusions (51), and the cross-sectional shape of the protrusions (51) is configured as an arc, a triangle, or a trapezoid.

2. The air filter with an ejection dust collecting device according to claim 1, characterized in that: The size of one end of the dust storage chamber (4) away from the air inlet is smaller than the size of the filtration area (13).

3. The air filter with an ejection dust collecting device according to claim 1, characterized in that: Contraction pipe sections (6) are fixedly provided on both sides of the guide plate (15), and the size of the connection between the contraction pipe section (6) and the gas-solid separator (5) is smaller than the size of the connection between the contraction pipe section (6) and the guide plate (15).

4. The air filter with an ejection dust collecting device according to claim 3, characterized in that: The angles formed between the tube wall cross section of the contraction tube section (6), the tube wall cross section of the first filter tube (11), and the tube wall cross section of the second filter tube (12) are acute angles.

5. The air filter with an ejection dust collection device according to claim 1, characterized in that: The filter units (1) are coaxially arranged vertically, and the second filter tube (12) of the inner filter unit (1) is sleeved on the outside of the first filter tube (11) of the filter unit (1) in the same group, and is sleeved on the inside of the first filter tube (11) of the filter unit (1) in the adjacent outer layer.

6. The air filter with an ejection dust collection device according to claim 1, characterized in that: The second filter tube (12) and the first filter tube (11) of the same group of filter units (1) are coaxially arranged, and the guide plate (15) is centrally symmetrically arranged with respect to the central axis of the innermost first filter tube (11).

7. The air filter with an ejection dust collection device according to claim 1, characterized in that: The collecting port (34) is directly opposite to an induced draft fan (7) for extracting dust, the air inlet of the filter area (13) is provided with a blower (8) for sucking external air into the filter area (13), and the air outlet of the clean air area (14) is provided with an induced draft fan (9) for promoting the discharge of clean air, and the induced draft fan (7), the blower (8) and the induced draft fan (9) are all configured as axial flow fans.

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