A combined air filter cartridge body and air filter cartridge

Abstract

The application belongs to the technical field of air filtration, and specifically discloses a combined air filter element main body and an air filter element, the combined air filter element main body comprising a frame body and a filter element main body structure; the filter element main body structure comprising: a filtering assembly, a gas-liquid separation assembly, an upper end cover and a lower end cover. The gas-liquid separation assembly and the filtering assembly are used for multi-stage filtering of air; the frame body is connected with the upper end cover and the lower end cover, and the frame body, the upper end cover and the gas-liquid separation assembly are formed with a self-cleaning channel leading to the filtering assembly, which is used for supplying a cleaning medium to clean the gas-liquid separation assembly and the filtering assembly; the lower end cover is provided with a liquid discharge groove, and liquid collected through filtering and cleaning in the filtering assembly and the gas-liquid separation assembly is discharged from the liquid discharge groove after converging in the direction of the lower end cover. The combined air filter element main body has good filtering performance, and the filter element main body is provided with an independent self-cleaning function, and is suitable for air filtration in a high-humidity and high-oil-mist environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air filtration, and more particularly relates to a combined air filter element main body and an air filter element. BACKGROUND

[0002] With the rapid development of gas turbine equipment towards high efficiency, reliability, zero pollution and other needs, the requirement of gas turbine equipment for air quality is higher and higher; and the air filter element configured at the inlet of the gas turbine equipment is the only defense line for air quality guarantee, which is crucial for the normal operation of the unit.

[0003] At present, large power equipment is basically applied in coastal areas and petrochemical industrial parks, which have the characteristics of high humidity, high oil mist and salt mist concentration, and high dust content. The traditional air filter element basically adopts paper-based materials, which is generally only used for filtering dust impurities in the air, and has poor adaptability to high humidity and high oil mist environment. The oil mist droplets and dust are quickly formed into an oil sludge layer on the surface of the filter element. Because the oil sludge layer is tightly wrapped on the surface of the filter element, the resistance of the filter element quickly rises, and the service life is greatly reduced. At the same time, under high resistance, the filter element has the risk of damage and failure, and the oil mist molecules and dust impurities may enter the downstream and adhere to the blades of the power equipment, causing blade corrosion, wear and fouling after long-term use, resulting in a decrease in the output efficiency of the power equipment, and even the fracture of the blades, which makes the traditional air filter element difficult to be applied to air filtration in high humidity and high oil pollution environment, and needs to be improved. SUMMARY

[0004] In view of the defects or improvement needs of the prior art, the present application provides a combined air filter element main body and an air filter element, aiming to improve the poor adaptability of the air filter element to high humidity and high oil mist environment.

[0005] The first aspect of the present application provides a combined air filter element main body, which specifically comprises a frame body and a cylindrical filter element main body structure.

[0006] The filter element main body structure comprises a filter assembly, a gas-liquid separation assembly sleeved outside the filter assembly, and upper and lower end covers covering both ends of the whole formed by the gas-liquid separation assembly and the filter assembly, wherein:

[0007] The gas-liquid separation assembly is used for filtering air, the filter assembly is used for re-filtering the air filtered by the gas-liquid separation assembly, and the upper end cover has a avoiding hole for the filter assembly to exhaust filtered air;

[0008] The frame body connects the upper end cover and the lower end cover, and the frame body, the upper end cover and the gas-liquid separation assembly form a self-cleaning channel leading to the filter assembly for cleaning medium to clean the gas-liquid separation assembly and the filter assembly;

[0009] The lower end cover is provided with a liquid discharge groove, and the liquid collected by filtering and cleaning in the filter assembly and the gas-liquid separation assembly is discharged through the liquid discharge groove after converging in the direction of the lower end cover.

[0010] Compared with the prior art, the air filter core body adopts a combined structure, the air can be filtered and purified in multiple stages through the gas-liquid separation assembly and the filter assembly, the separation and filtration of the multiphase particulate matter in the air are realized, the oil sludge layer is avoided to be formed in the same filter level, the air filter core body is not easy to fail quickly, the efficiency of the filter core is ensured, and high-quality intake air can be provided for power equipment such as air compressors, diesel engines and gas turbines.

[0011] The frame not only fixes the upper end cover and the lower end cover, but also forms a self-cleaning channel leading to the filter assembly with the upper end cover and the gas-liquid separation assembly. When a relatively thick oil sludge layer is accumulated in the air filter core, the air filter core body is cleaned by introducing a cleaning medium (such as high-temperature gas flow or other oil mist cleaning agents) into the self-cleaning channel, and then the liquid collected by filtering and cleaning converges in the direction of the lower end cover and is discharged through the liquid discharge groove, so that the air filter core is quickly cleaned. Through the combined design of the gas-liquid separation assembly and the filter assembly, the internal self-contained cleaning channel is matched, so that the air filter core body can be better applied to high-humidity and high-oil-mist environments and has a longer service life.

[0012] As a further preferred, the filter assembly comprises a plurality of elastic filter units in the shape of a shuttle for filtering air, and the plurality of elastic filter units are sequentially and communicatively connected in the axial direction.

[0013] As a further preferred, the filter unit comprises an elastic skeleton capable of compressive deformation, and an elastic filter layer laid on the circumferential surface of the elastic skeleton.

[0014] As a further preferred, the gas-liquid separation assembly comprises:

[0015] A plurality of gas-liquid separation sheets are spaced apart along the circumference of the filter assembly and are used for intercepting and filtering impurities in the air.

[0016] A coalescence mesh layer is used for coalescing and trapping impurities in the air that has been preliminarily filtered by the gas-liquid separation sheet.

[0017] A porous support frame is used for supporting the coalescence mesh layer.

[0018] As a further preferred, the outer side of the gas-liquid separation sheet has a Y-shaped jaw for intercepting impurities.

[0019] As a further preferred, the self-cleaning channel comprises a first channel shaped in the gas-liquid separation sheet, and a plurality of through holes are distributed on the inner side of the gas-liquid separation sheet in the axial direction, and the openings of the plurality of through holes are directed towards the filter assembly.

[0020] As a further preferred, the self-cleaning channel further comprises a first chamber shaped in the upper end cover, and the first chamber is in communication with the plurality of first channels.

[0021] As a further preferred, the frame body comprises a support rod and a branch rod, the upper end of the support rod is fixed with the upper end cover through the branch rod, the lower end of the support rod is fixed with the lower end cover, and the self-cleaning channel comprises a second channel shaped in the upper end of the support rod and the branch rod.

[0022] As a further preferred, the lower end of the support rod is provided with a limiting piece which can be adjusted in the axial direction of the support rod, so as to adjust the degree of axial deformation of the filter assembly.

[0023] The second aspect of the present application provides an air filter element using the following technical solution:

[0024] An air filter element comprises a main pipe and a plurality of any one of the combined air filter element bodies according to the first aspect, the main pipe is connected with the plurality of frame bodies, and the main pipe is provided with a cleaning medium supply channel for communication with the self-cleaning channel.

[0025] By using the above technical solution, the air filter element comprises a plurality of combined air filter element bodies, which can filter a large area of air; when cleaning of the air filter element is required, only the cleaning medium needs to be introduced into the main pipe, and the self-cleaning of the plurality of air filter elements can be completed at the same time.

[0026] Overall, compared with the prior art, the above technical solution conceived by the present application mainly has the following technical advantages:

[0027] 1. The air filter element body adopts a combined structure, each air filter element body structure is independently provided with a self-cleaning function, which not only ensures the filtering efficiency of the air filter element, but also facilitates maintenance of the air filter element, so that the air filter element can be used as a combined HEPA level multi-phase separation high-efficiency air filter element, which is suitable for air filtration applications in high-humidity and high-oil-mist environments.

[0028] 2. The gas-liquid separation assembly is mainly used for removing large-particle dust, liquid droplets, oil mist and salt mist particles in the air, and is a fixed maintenance-free structure, which can be cleaned and reused automatically; the filter assembly is mainly used for removing small-particle dust particles and oil mist salt mist particles in the air, and can be conveniently replaced after reaching the service life; the air containing multiphase pollutants such as water, oil mist and salt mist, dust particles and the like in the working environment passes through the filtration of the gas-liquid separation assembly and the filter assembly in turn, so that the air is gradually filtered and purified.

[0029] 3. The self-cleaning channel independently exists and is combined in the components of the air filter core body at the same time, so that the structure of the air filter core body is compact and the installation space is small.

[0030] 4. The filter assembly adopts a stacked series installation mode, the number of elastic filter units can be freely adjusted according to the space, and independent replacement and cleaning are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a sectional view of a combined air filter core body provided by an embodiment of the present application;

[0032] Figure 2 is a working principle diagram of the combined air filter core body provided by an embodiment of the present application;

[0033] Figure 3 is a connection structure diagram of the gas-liquid separation assembly, the upper end cover, the lower end cover and the supporting rod provided by an embodiment of the present application;

[0034] Figure 4 is Figure 3 a sectional view of line A-A in FIG. 4;

[0035] Figure 5 is Figure 3 a sectional view of line B-B in FIG. 4;

[0036] Figure 6 is Figure 3 an enlarged view of position C in FIG. 4;

[0037] Figure 7 is a sectional view of a filter assembly provided by an embodiment of the present application;

[0038] Figure 8 is a whole structure diagram of an air filter core provided by an embodiment of the present application.

[0039] In all the drawings, the same reference signs are used to represent the same elements or structures, wherein:

[0040] 1-1, main pipe; 1-2, branch pipe; 1-3, fixed plate; 2, filter assembly; 2-1, elastic filter layer; 2-2, elastic pad; 2-3, elastic porous support plate; 2-4, elastic support; 3, gas-liquid separation assembly; 3-1, gas-liquid separation sheet; 3-2, coalescence mesh layer; 3-3, porous support frame; 4, upper end cover; 5, lower end cover; 6, cover; 7, nut; 8, tooth opening; 10, first channel; 20, first chamber; 30, second channel. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application.

[0042] The present application is further described below in combination with the drawings and examples. Figures 1-8 The present application is further described below in combination with the drawings and examples.

[0043] The present application discloses a combined air filter element main body. Referring to Figures 1-3 , the combined air filter element main body comprises a frame body and a cylindrical filter element main body structure. The filter element main body structure comprises a filter assembly 2, a gas-liquid separation assembly 3, an upper end cover 4 and a lower end cover 5; the gas-liquid separation assembly 3 is sleeved outside the filter assembly 2, and the upper end cover 4 and the lower end cover 5 are fixedly covered at the upper and lower ends of the whole formed by the gas-liquid separation assembly 3 and the filter assembly 2. In the present air filter element main body, the gas-liquid separation assembly 3 is used for filtering air, the filter assembly 2 is used for re-filtering the air filtered by the gas-liquid separation assembly 3, and the upper end cover 4 has a relief hole capable of allowing the filtered air outside the filter assembly 2 to pass. The frame body not only connects the upper end cover 4 and the lower end cover 5, but also forms a self-cleaning channel leading to the filter assembly 2 with the upper end cover 4 and the gas-liquid separation assembly 3, and the self-cleaning channel is used for allowing the cleaning medium to clean the gas-liquid separation assembly 3 and the filter assembly 2. The lower end cover 5 is provided with a liquid discharge groove, and the liquid collected by filtering and cleaning in the filter assembly 2 and the gas-liquid separation assembly 3 is gathered in the direction of the lower end cover 5 and then discharged through the liquid discharge groove.

[0044] Further, as shown in Figures 2-5 , in the present embodiment, the gas-liquid separation assembly 3 is in a cylindrical shape, specifically comprising a gas-liquid separation sheet 3-1, a coalescence mesh layer 3-2 and a porous support frame 3-3; the gas-liquid separation sheet 3-1, the coalescence mesh layer 3-2 and the porous support frame 3-3 are arranged from outside to inside in sequence, and are respectively fixedly connected or abuttingly connected with the upper end cover 4 and the lower end cover 5.

[0045] Among them, as shown in Figure 5As shown, multiple gas-liquid separators 3-1 are distributed circumferentially along the filter assembly 2 to intercept and filter impurities in the air; the coalescing mesh layer 3-2 is used to coalesce and retain impurities in the air that has been initially filtered by the gas-liquid separators 3-1; and the porous support frame 3-3 is used to support the coalescing mesh layer 3-2.

[0046] As a preferred option, such as Figure 6 As shown, the gas-liquid separator 3-1 has a Y-shaped fin hollow structure, with its Y-shaped teeth 8 facing outwards from the filter element, used to intercept and remove impurities such as large-diameter solid particles and liquid droplets.

[0047] When using this air filter, if Figure 2 As indicated by the thick arrow, airflow flows into the gaps between the gas-liquid separators 3-1, colliding with the Y-shaped teeth 8 at the inlet. Larger droplets and dust particles are intercepted and filtered by the Y-shaped teeth 8. The airflow then enters the coalescing mesh layer 3-2, where small droplets gradually coalesce into larger droplets. Under the influence of gravity, the droplets gathered at the Y-shaped teeth 8 and the coalescing mesh layer 3-2 fall axially into the bottom of the gas-liquid separator 3, and are finally discharged through the drain trough on the outer edge of the lower cover 6. The air flowing out of the coalescing mesh layer 3-2 contains only small droplets and dust particles, which will be filtered by the filter assembly 2 to ensure the cleanliness of the final downstream air.

[0048] Furthermore, such as Figure 1 As shown, the filter assembly 2 is constrained between the upper end cover 4 and the lower end cover 5, and includes multiple spindle-shaped elastic filter units for filtering air, which are connected in series along the axial direction.

[0049] Among them, such as Figure 7 As shown, the upper and lower ends of the elastic filter unit are connected. The elastic filter unit includes a compressible elastic skeleton and an elastic filter layer 2-1 laid on the circumferential surface of the elastic skeleton.

[0050] In this embodiment, the elastic frame includes an elastic pad 2-2, an elastic porous support plate 2-3, and an elastic bracket 2-4. The elastic porous support plate 2-3 is composed of upper and lower sections, forming a spindle-shaped elastic frame body. Two elastic pads 2-2 are provided, preferably made of elastic metal. The upper elastic pad 2-2 is horizontally connected and fixed to the inner side of the upper end of the elastic frame body, and the lower elastic pad 2-2 is horizontally connected and fixed to the inner side of the lower end of the elastic frame body. The elastic bracket 2-4 is axially connected between the upper and lower elastic pads 2-2, providing elastic support between them. The elastic filter layer 2-1 is preferably made of high-efficiency metal fiber, which is laid flat on the surface of the porous support plate and fixed at the edges.

[0051] As preferred, the elastic support 2-4 comprises a spring and two limiting rods, the two limiting rods are connected with the two elastic pads 2-2 one by one, the two limiting rods can form a gap between them, and the spring connects the upper and lower two elastic pads 2-2. In some other embodiments, the elastic support can also adopt an elastic rod body frame structure and the like.

[0052] Further, as shown in Figure 1 The lower surface of the lower end cover 5 is provided with a avoiding opening, and the avoiding opening of the lower end cover 5 extends inwardly into the cover 6. The upper end of the cover 6 is in sealing connection with the lower end through hole of the elastic filter unit at the bottom. The lower end of the cover extends outwardly to form a flange, and the top surface of the flange is clamped between the lower surface of the lower end cover 5 and the elastic pad layer.

[0053] As shown in Figure 7 After the air flow passes through the filter of the gas-liquid separation assembly 3 from outside to inside, the air flow passes through the elastic filter layer 2-1 and the porous support plate in sequence, and then is discharged from the top end of the elastic filter unit.

[0054] Further, in order to improve the structural stability of the combined air filter core body, in the embodiment, the frame body comprises a support rod 1-2 and branch rods. The upper end of the support rod 1-2 is fixed to the upper end cover 4 through the branch rods, and the plurality of branch rods on the support rod 1-2 are preferably evenly distributed along the radial direction of the filter core body. The lower end of the support rod 1-2 is provided with a limiting piece, which can be adjusted in displacement along the axial direction of the support rod 1-2, and is used for adjusting the axial deformation degree of the filter assembly 2. In the embodiment, the limiting piece compresses the filter assembly 2 by abutting against the cover 6. At this time, the abutted cover 6 also presses and fixes the lower end cover 5 through the elastic pad layer, so that the entire filter body remains stable.

[0055] The limiting piece can be a latch, a nut, a threaded sleeve or the like. As preferred, the limiting piece in the embodiment is selected as a nut 7, and the lower end of the support rod 1-2 is provided with a threaded structure. The nut 7 is threadedly connected to the lower end of the support rod 1-2. By adjusting the nut 7, the cover 6 at the lower end of the filter assembly 2 is pressed and abutted, so as to realize the compression of the elastic support and the close contact between the contact surfaces of the elastic filter units. In addition, high-temperature-resistant sealing gaskets and foamed sealing gaskets and the like are also used to realize the sealing of the connection of the high-efficiency filter assembly.

[0056] Further, in order to facilitate the cleaning of the air filter core, the self-cleaning channel in the above comprises a first channel 10 formed in the gas-liquid separation sheet 3-1, a first chamber 20 formed in the upper end cover 4, and a second channel 30 formed in the support rod 1-2 and the branch rods. The second channel 30 is in communication with the first chamber 20, the first chamber 20 is in communication with the plurality of first channels 10, and high-temperature-resistant sealing gaskets, foamed sealing gaskets and the like are used to realize the sealing of the connection.

[0057] The first channel 10 is a hollow channel in the gas-liquid separation sheet 3-1, and the inner side of the gas-liquid separation sheet 3-1 is axially distributed with a plurality of through holes (not shown in the figure) communicating with the first channel 10, and the openings of the plurality of through holes are directed towards the filter assembly 2. As shown by the fine arrow pointing to the branch rod 1-2, the direction indicated by the fine arrow is the flow direction of the cleaning medium. Figure 2

[0058] Further, a plurality of screw rods are fixed on the upper end cover 4 of the air filter element, and the plurality of screw rods can be used to assemble nuts to fix the air filter element on a mounting base such as the fixing plate 1-3.

[0059] The application further discloses an air filter element. Referring to Figure 8 The air filter element comprises a main pipe 1-1 and a plurality of the combined air filter element bodies described above, the main pipe 1-1 is connected with the frames in the plurality of combined air filter element bodies, and the main pipe 1-1 has a cleaning medium supply channel for communicating with the self-cleaning channel.

[0060] In some embodiments, the frame further comprises a fixing plate 1-3. The fixing plate 1-3 is preferably an air filter element hole plate, and the fixing plate 1-3 is located at the upper end of the plurality of combined air filter element bodies and is connected with the upper end cover 4 at the upper end of the plurality of air filter elements.

[0061] With the continuous use of the air filter element, when the operating resistance reaches a set value, the gas-liquid separation assembly 3 and the filter assembly 2 should be maintained in a self-cleaning manner in time. One implementation method is as follows:

[0062] A high-temperature gas flow is delivered to the main pipe 1-1, the high-temperature gas flow flows into the first chamber 20 in the upper end cover 4 through the branches on the upper end of the branch rod 1-2, the high-temperature gas flow passes through the first channels 10 of each gas-liquid separation sheet 3-1 communicating with the first chamber 20, and finally is sprayed out through the through holes axially arranged on the inner side of each gas-liquid separation sheet 3-1, the high-temperature gas flow heats the gas-liquid separation sheet 3-1 and the downstream coalescing mesh layer 3-2, dilutes and softens the oil mist particles remaining in the gas-liquid separation sheet 3-1 and the coalescing mesh layer 3-2, and makes the oil mist particles fall into the bottom for discharge, thereby realizing self-cleaning maintenance of the gas-liquid separation assembly 3; at the same time, the high-temperature gas flows into each shuttle-shaped filter element of the filter assembly 2 to heat the elastic filter layer 2-1 and clean the surface oil mist and solid particles, thereby realizing the self-cleaning function and starting the unit for operation. When the pollutant particles on the surface of the shuttle-shaped filter element penetrate into the inside of the filter layer and cannot be cleaned, a brand-new filter element should be replaced in time.

[0063] It should be noted that, according to actual working conditions, the application can set online and offline self-cleaning modes, and can use high-temperature gas flow or other oil mist cleaning agents for cleaning.

[0064] ​It is to be understood that the terms such as "include" and "may include" used in the present application indicate the presence of disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In the present application, terms such as "include" and / or "have" can be construed to denote a specific characteristic, number, operation, constituent element, component or a combination thereof, but cannot be construed to exclude the existence of or a possibility of addition of one or more other characteristics, numbers, operations, constituent elements, components or combinations thereof.

[0065] It should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are used only for convenience of description and simplification of the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0066] In addition, the terms "first", "second", etc. are used only for the purpose of description and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0067] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing", and the like should be understood in a broad sense, for example, can be fixed connection, can be detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A modular air filter cartridge body characterized by, The filter cartridge comprises a frame and a cylindrical filter core body structure; The filter core body structure comprises a filter assembly (2), a gas-liquid separation assembly (3) sleeved outside the filter assembly (2), an upper end cover (4) and a lower end cover (5) covering two end portions of the whole formed by the gas-liquid separation assembly (3) and the filter assembly (2), wherein: The gas-liquid separation assembly (3) is used for filtering air, the filter assembly (2) is used for re-filtering the air filtered by the gas-liquid separation assembly (3), and the upper end cover (4) has a avoiding hole for the filter assembly (2) to discharge filtered air. The frame connects the upper end cover (4) and the lower end cover (5), and the frame, the upper end cover (4) and the gas-liquid separation assembly (3) are formed with a self-cleaning channel leading to the filter assembly (2) for cleaning medium to clean the gas-liquid separation assembly (3) and the filter assembly (2). The lower end cover (5) is provided with a liquid discharge groove, and the liquid collected by filtering and cleaning in the filter assembly (2) and the gas-liquid separation assembly (3) converges in the direction of the lower end cover (5) and is discharged through the liquid discharge groove. The gas-liquid separation assembly (3) comprises: A plurality of gas-liquid separation sheets (3-1) are distributed along the circumference of the filter assembly (2) and are used for intercepting and filtering impurities in the air. A coalescence mesh layer (3-2) is used for coalescing and trapping impurities in the air preliminarily filtered by the gas-liquid separation sheet (3-1). A porous support frame (3-3) is used for supporting the coalescence mesh layer (3-2). The self-cleaning channel comprises a first channel (10) formed in the gas-liquid separation sheet (3-1), and the inner side of the gas-liquid separation sheet (3-1) is distributed with a plurality of through holes communicating with the first channel (10), and the openings of the plurality of through holes are directed to the filter assembly (2).

2. The modular air cleaner element body of claim 1 wherein, The filter assembly (2) comprises a plurality of shuttle-shaped elastic filter units for filtering air, and the plurality of elastic filter units are sequentially and serially communicated along the axial direction.

3. The modular air cleaner element body of claim 2 wherein, The filter unit comprises a shuttle-shaped compressible elastic framework and an elastic filter layer (2-1) laid on the circumferential surface of the elastic framework.

4. The modular air cleaner element body of claim 1 wherein, The outer side of the gas-liquid separation sheet (3-1) has a Y-shaped tooth (8) for intercepting impurities.

5. The modular air cleaner element body of claim 1 wherein, The self-cleaning channel further comprises a first cavity (20) formed in the upper end cover (4), and the first cavity (20) is in communication with the plurality of first channels (10).

6. The modular air cleaner element body of any of claims 1-5, wherein, The frame comprises a support rod (1-2) and a branch rod, the upper end of the support rod (1-2) is fixed to the upper end cover (4) through the branch rod, the lower end of the support rod (1-2) is fixed to the lower end cover (5), and the self-cleaning channel comprises a second channel (30) formed in the upper end of the support rod (1-2) and the branch rod.

7. The modular air cleaner element body of claim 6 wherein, The lower end of the support rod (1-2) has a limiting piece which can be adjusted in displacement along the axial direction of the support rod (1-2) to adjust the axial deformation degree of the filter assembly (2).

8. An air filter cartridge, characterized by, An air cleaner assembly comprising a main pipe (1-1) connected to the frames of a plurality of the combined air cleaner bodies as claimed in any one of claims 1 to 7, the main pipe (1-1) having a cleaning medium supply passage for communicating with the self-cleaning passage.

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