Multi-stage combined air filter element

Abstract

The utility model belongs to the field of air filter elements, and particularly discloses a multistage combined air filter element which comprises a filter element shell, and an air flow channel is formed in the middle of the filter element shell and extends to the two ends to form an air flow inlet and an air flow outlet; a low-efficiency filtering section, a medium-efficiency filtering section and a high-efficiency filtering section are sequentially arranged in the air flow channel in the air flow direction. According to the filter element, a Z-shaped axial filtering mode is adopted, layered flow channels are designed, coarse, medium and efficient filtering of air is achieved in sequence, the structure is compact, the flow channels are stable, impurities such as oil mist and dust can be effectively filtered, and the filter element is suitable for various special environments; and the integrated combined structure simultaneously replaces the traditional coarse-efficiency, medium-efficiency and high-efficiency multi-stage independent mode, so that the space size and the production cost of the system are greatly reduced.

Description

Technical Field

[0001] The present application belongs to the field of air filter elements, and more specifically, relates to a multi-stage combined air filter element. Background Art

[0002] With the rapid development of gas turbine equipment, the requirements for the quality of its intake air are becoming increasingly higher. The air filter element configured at the inlet is the only line of defense to ensure the quality of intake air and is crucial to the normal operation of the unit.

[0003] Air filters in traditional gas turbine intake filtration systems typically utilize a single-stage or two-stage filtration method, generally used only to filter dust impurities from the air and failing to meet the air cleanliness requirements of the gas turbine. This makes air filters less suitable for coastal areas and petrochemical industrial parks, where humidity, oil mist concentration, and dust content are high. Oil mist droplets mixed with dust quickly form a sludge layer on the filter surface, tightly wrapping it. This rapidly increases filter resistance and significantly shortens its lifespan. High resistance also creates a risk of filter breakage and failure. Oil mist molecules and dust impurities enter the downstream system and adhere to the blades of the power equipment. Long-term use can cause corrosion, wear, and scaling of the blades, resulting in reduced power equipment output efficiency and even serious consequences such as blade breakage. Utility Model Content

[0004] In response to the defects of the existing technology, the present application provides a multi-stage combined air filter element, which aims to solve the problem that the existing air filter element has poor applicability in special environments.

[0005] The present application provides a multi-stage combined air filter element, specifically comprising a filter element housing, wherein an air flow channel is opened in the middle of the filter element housing and extends to both ends to form an air flow inlet and an air flow outlet;

[0006] The air flow channel is provided with a coarse-effect filter section, a medium-effect filter section and a high-efficiency filter section in sequence along the air flow direction;

[0007] The coarse filter section is provided with a plurality of air inlet channels and first guide channels arranged alternately up and down, the air inlet channels are connected to the air flow inlet, and a coarse filter plate is provided between adjacent air inlet channels and first guide channels;

[0008] The medium efficiency filtration section is provided with a plurality of medium efficiency filtration channels and second guide channels arranged alternately up and down, a medium efficiency filtration plate is provided between adjacent medium efficiency filtration channels and second guide channels, and the medium efficiency filtration channels are connected to the ends of the first guide channels;

[0009] The high-efficiency filtration section is provided with a number of high-efficiency filtration channels and air outlet channels arranged alternately up and down, the air outlet channels are connected to the air flow outlet, a high-efficiency filter plate is provided between adjacent high-efficiency filtration channels and air outlet channels, and the high-efficiency filtration channels are connected to the end of the second guide channel.

[0010] The above technical solution conceived by the present application, compared with the existing technology, because the filter element of the present application adopts a Z-shaped axial filtration method and is designed with a layered flow channel, it can realize coarse, medium and high-efficiency filtration of the air in sequence, has a compact structure and a smooth flow channel, and can effectively filter impurities such as oil mist and dust, and is suitable for beneficial effects in various special environments.

[0011] As a further preferred embodiment, the filter element also includes a top sealing plate assembly, a bottom sealing plate assembly, several first end sealing plate assemblies and second end sealing plate assemblies, the top sealing plate assembly is fixedly connected to the top of the air flow channel, and the bottom sealing plate assembly is fixedly connected to the bottom of the air flow channel; several first end sealing plate assemblies and second end sealing plate assemblies are alternately arranged between the top sealing plate assembly and the bottom sealing plate assembly and arranged parallel to each other, and the end of the first end sealing plate assembly and the front end of the second end sealing plate assembly are staggered.

[0012] By adopting the above technical solution, the interior of the filter element housing provides a carrier for the installation of the coarse-efficiency filter plate, the medium-efficiency filter plate and the high-efficiency filter plate, making the overall filter element and the internal flow channel structure more stable and improving the filtering effect.

[0013] As a further preferred embodiment, the first end sealing plate assembly includes a first front end plate and a first rear end plate, both of which are fixedly connected to the inner wall of the air flow channel, the first front end plate is connected to the front end of the first guide channel, and the first rear end plate is connected to the end of the medium-efficiency filter channel.

[0014] By adopting the above technical solution, air enters from the air inlet channel, passes through the coarse-efficiency filter plate and then enters the first guide channel. The first front end plate blocks the front end of the first guide channel. When the airflow flows to the end of the medium-efficiency filter channel, it is blocked by the first rear end plate, passes through the upper and lower medium-efficiency filter plates and enters the second guide channel, completing the guidance and filtration of the airflow in the middle part of the air flow channel.

[0015] As a further preferred embodiment, the second end sealing plate assembly includes a second front end plate and a second rear end plate, the second front end plate and the second rear end plate are both fixedly connected to the inner wall of the air flow channel, the second front end plate is connected to the end of the air inlet channel between the top and bottom of the air flow channel, and the second rear end plate is connected to the end of the high-efficiency filtration channel between the top and bottom of the air flow channel.

[0016] By adopting the above technical solution, air enters from the air inlet channel, and after being blocked by the second front end plate at the end of the air inlet channel, it can pass through the coarse filter plate for coarse filtration; the air flows to the end of the high-efficiency filtration channel, and after being blocked by the second rear end plate, it can pass through the upper and lower high-efficiency filter plates for high-efficiency filtration, and the airflow in the middle part of the air flow channel is guided to achieve filtration.

[0017] As a further preferred embodiment, the top sealing plate assembly includes a first top sealing plate and a second top sealing plate fixedly connected to the top inner wall of the air flow channel and parallel to each other, the first top sealing plate being connected to the end of the air inlet channel at the top of the air flow channel, and the second top sealing plate being connected to the end of the high-efficiency filtration channel at the top of the air flow channel.

[0018] By adopting the above technical solution, air enters the air inlet channel, is blocked by the first top sealing plate, and can then pass through the coarse filter plate for coarse filtration; the air flows to the high-efficiency filtration channel, is blocked by the second top sealing plate, and can then pass through the high-efficiency filter plate for high-efficiency filtration, thereby guiding the airflow at the top of the air flow channel to achieve filtration.

[0019] As a further preferred embodiment, the bottom sealing plate assembly includes a first bottom sealing plate and a second bottom sealing plate fixedly connected to the inner wall of the bottom of the air flow channel and parallel to each other, the first bottom sealing plate being connected to the end of the air inlet channel at the bottom of the air flow channel, and the second bottom sealing plate being connected to the end of the high-efficiency filtration channel at the bottom of the air flow channel.

[0020] By adopting the above technical solution, air enters the air inlet channel, is blocked by the first bottom sealing plate, and can then pass through the coarse filter plate for coarse filtration; the air flows to the high-efficiency filtration channel, is blocked by the second bottom sealing plate, and can then pass through the high-efficiency filter plate for high-efficiency filtration, thereby guiding the airflow at the bottom of the air flow channel to achieve filtration.

[0021] As a further preference, the first front end plate, the first rear end plate, the second front end plate and the second rear end plate are all provided with mounting grooves.

[0022] By adopting the above technical solution, the installation stability of the coarse-efficiency filter plate, the medium-efficiency filter plate and the high-efficiency filter plate can be improved, thereby improving the filtering effect of the filter element.

[0023] As a further preference, the coarse-effect filter plate, the medium-effect filter plate and the high-efficiency filter plate all have a wavy structure.

[0024] By adopting the above technical solution, the filtering area can be increased, thereby improving the filtering effect.

[0025] As a further preferred embodiment, the diameters of the filter holes on the coarse-effect filter plate, the medium-effect filter plate and the high-efficiency filter plate decrease in sequence.

[0026] By adopting the above technical solution, graded filtration is achieved, impurities of different volumes in the air are removed in sequence, the filtration effect is further improved, and the filtration pressure of the filter element is reduced.

[0027] In general, the above technical solutions conceived by this application have the following technical advantages compared with the existing technologies:

[0028] 1. The filter element in this application utilizes a Z-shaped axial filtration method and a layered flow channel design to sequentially achieve coarse, medium, and high-efficiency filtration of air. Its compact structure and smooth flow channel effectively filter impurities such as oil mist and dust, making it suitable for a variety of special environments. Furthermore, the filter element's integrated modular structure replaces the traditional multi-stage independent coarse, medium, and high-efficiency filter system, significantly reducing the system's space requirements and production costs.

[0029] 2. By arranging a top sealing plate assembly, a bottom sealing plate assembly, a plurality of first end sealing plate assemblies, and a second end sealing plate assemblies within the air flow path of the filter element housing, a support is provided for the installation of the coarse-efficiency filter plates, the medium-efficiency filter plates, and the high-efficiency filter plates. This makes the overall filter element and the internal flow path structure more stable, thereby improving the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of the filter element provided in an embodiment of the present application;

[0031] Figure 2 Schematic diagram of a partial cross-sectional structure of a filter element provided in an embodiment of the present application;

[0032] Figure 3 This is a schematic diagram of the overall structure of the coarse-efficiency filtration segment, medium-efficiency filtration segment, and high-efficiency filtration segment provided in the embodiment of the present application;

[0033] Figure 4 yes Figure 3 Look at the structural diagram;

[0034] Figure 5 yes Figure 4 Schematic diagram of the cross-section structure along line AA;

[0035] Figure 6 yes Figure 4 Schematic diagram of the cross-section structure along line BB;

[0036] Figure 7 yes Figure 4 Schematic diagram of the cross-section structure along line CC;

[0037] Figure 8 yes Figure 4 Schematic diagram of the cross-section structure along line DD;

[0038] Figure 9is a schematic diagram of a whole structure of a first end seal plate assembly provided by an embodiment of the present application;

[0039] Figure 10 is a schematic diagram of a whole structure of a top seal plate assembly provided by an embodiment of the present application;

[0040] Figure 11 is a schematic diagram of a whole structure of a bottom seal plate assembly provided by an embodiment of the present application.

[0041] In all the drawings, the same reference signs are used to indicate the same elements or structures, wherein:

[0042] 101, first end seal plate assembly; 101-1, first front end plate; 101-2, first rear end plate; 102, filter core shell; 103, coarse efficiency filter section; 103-1, air inlet channel; 103-2, first flow guide channel; 103-3, coarse efficiency filter plate; 104, top seal plate assembly; 104-1, first top seal plate; 104-2, second top seal plate; 105, medium efficiency filter section; 105-1, medium efficiency filter channel; 105-2, second flow guide channel; 105-3, medium efficiency filter plate; 106, high efficiency filter section; 106-1, high efficiency filter channel; 106-2, air outlet channel; 106-3, high efficiency filter plate; 107, bottom seal plate assembly; 107-1, first bottom seal plate; 107-2, second bottom seal plate; 108, second end seal plate assembly; 108-1, second front end plate; 108-2, second rear end plate. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0044] With reference to Figure 1-8 , the multi-stage combined air filter core disclosed by the present application comprises a filter core shell 102, a top seal plate assembly 104, a bottom seal plate assembly 107, a plurality of first end seal plate assemblies 101 and second end seal plate assemblies 108. The middle part of the filter core shell 102 is provided with an air flow channel and extends to both ends to form an air inlet and an air outlet, and the cross section of the air flow channel is in a rectangular structure. The coarse efficiency filter section 103, the medium efficiency filter section 105 and the high efficiency filter section 106 are sequentially arranged in the air flow channel along the air flow direction, i.e., sequentially arranged from the air inlet end to the air outlet end.

[0045] Specifically, the top sealing plate assembly 104 is fixedly connected to the top of the air flow channel, and the bottom sealing plate assembly 107 is fixedly connected to the bottom of the air flow channel; a plurality of first end sealing plate assemblies 101 and second end sealing plate assemblies 108 are fixedly installed alternately between the top sealing plate assembly 104 and the bottom sealing plate assembly 107 and are arranged parallel to each other, and the end of the first end sealing plate assembly 101 and the front end of the second end sealing plate assembly 108 are staggered. The internal structure of the air flow channel is formed by the top sealing plate assembly 104, the bottom sealing plate assembly 107, a plurality of first end sealing plate assemblies 101 and the second end sealing plate assemblies 108, and the coarse filter plate 103-3, the medium filter plate 105-3 and the high efficiency filter plate 106-3, forming the coarse filter section 103, the medium filter section 105 and the high efficiency filter section 106 in sequence.

[0046] In this embodiment, the coarse-effect filter section 103 is alternately provided with a plurality of air inlet channels 103-1 and a first guide channel 103-2 from top to bottom. The air inlet channel 103-1 is a horizontal channel and is connected to the air flow inlet. A coarse-effect filter plate 103-3 is provided between the adjacent air inlet channels 103-1 and the first guide channel 103-2. The air flow enters the air inlet channel 103-1 from the air flow inlet, and then passes through the coarse-effect filter plate 103-3 upward or downward into the first guide channel 103-2 to complete the coarse-effect filtration; the medium-efficiency filter section 105 is alternately provided with a plurality of medium-efficiency filter channels 105-1 and a second guide channel 105-2 from top to bottom. A medium-efficiency filter plate 105-3 is provided between the adjacent medium-efficiency filter channels 105-1 and the second guide channel 105-2. The front end of the medium-efficiency filter channel 105-1 and the first guide channel 103 are connected. -2 is connected, the airflow flows from the first guide channel 103-2 to the medium-efficiency filtration channel 105-1, and then passes through the medium-efficiency filter plate 105-3 upward or downward to enter the second guide channel 105-2 to complete the medium-efficiency filtration; the high-efficiency filtration section 106 is alternately provided with a number of high-efficiency filtration channels 106-1 and air outlet channels 106-2 from top to bottom, the air outlet channels 106-2 are connected to the airflow outlet, and a high-efficiency filter plate 106-3 is arranged between adjacent high-efficiency filtration channels 106-1 and air outlet channels 106-2. The front end of the high-efficiency filtration channel 106-1 is connected to the end of the second guide channel 105-2, and the airflow flows from the second guide channel 105-2 to the high-efficiency filtration channel 106-1, and then passes through the high-efficiency filter plate 106-3 upward or downward to enter the air outlet channel 106-2 and is discharged, completing the high-efficiency filtration of the airflow. The diameters of the filter holes on the coarse-effect filter plate 103-3, the medium-effect filter plate 105-3, and the high-efficiency filter plate 106-3 decrease in sequence. This application utilizes a Z-shaped axial filtration method to design a layered flow channel, thereby achieving coarse, medium, and high-efficiency filtration of air. In this application, the end of each flow channel facing the airflow inlet is the front end, and the end facing the airflow outlet is the terminal end.

[0047] Furthermore, the top sealing plate assembly 104 includes a first top sealing plate 104-1 and a second top sealing plate 104-2, the first top sealing plate 104-1 and the second top sealing plate 104-2 are both fixedly connected to the top of the air flow channel and are parallel to each other, the first top sealing plate 104-1 is connected to the end of the air inlet channel 103-1 at the top of the air flow channel, and the second top sealing plate 104-2 is connected to the end of the high-efficiency filter channel 106-1 at the top of the air flow channel; the bottom sealing plate assembly 107 includes a first bottom sealing plate 107-1 and a second bottom sealing plate 107-2, the first bottom sealing plate 107-1 and the second bottom sealing plate 107-2 are both fixedly connected to the bottom of the air flow channel and are parallel to each other, the first bottom sealing plate 107-1 is connected to the end of the air inlet channel 103-1 at the bottom of the air flow channel, and the second bottom sealing plate 107-2 is connected to the end of the high-efficiency filter channel 106-1 at the bottom of the air flow channel. The air enters from the top air inlet channel 103-1, and after being blocked by the first top sealing plate 104-1, it can pass downward through the coarse filter plate 103-3 for coarse filtration; the air flows to the top high-efficiency filter channel 106-1, and after being blocked by the second top sealing plate 104-2, it can pass downward through the high-efficiency filter plate 106-3 for high-efficiency filtration; similarly, the air enters from the bottom air inlet channel 103-1, and after being blocked by the first bottom sealing plate 107-1, it can pass upward through the coarse filter plate 103-3 for coarse filtration; the air flows to the high-efficiency filter channel 106-1, and after being blocked by the second bottom sealing plate 107-2, it can pass upward through the high-efficiency filter plate 106-3 for high-efficiency filtration.

[0048] Furthermore, the first end sealing plate assembly 101 is provided with five groups, and the first end sealing plate assembly 101 includes a first front end plate 101-1 and a first rear end plate 101-2, and the ends of the first front end plate 101-1 and the first rear end plate 101-2 are fixedly connected to the inner walls on the left and right sides of the air flow channel respectively, the first front end plate 101-1 is connected to the front end of the first guide channel 103-2, and the first rear end plate 101-2 is connected to the end of the medium efficiency filter channel 105-1; the second end sealing plate assembly 108 is provided with four groups, and the second end sealing plate assembly 108 includes a second front end plate 108-1 and a second rear end plate 108-2. The ends of the second front end plate 108-1 and the second rear end plate 108-2 are fixedly connected to the inner walls on the left and right sides of the air flow channel respectively, the second front end plate 108-1 is connected to the end of the air inlet channel 103-1 between the top and bottom of the air flow channel, and the second rear end plate 108-2 is connected to the end of the high-efficiency filtration channel 106-1 between the top and bottom of the air flow channel. The air enters the air inlet channel 103-1, and after being blocked by the second front end plate 108-1, it can pass through the coarse filter plates 103-3 above and below and then enter the first guide channel 103-2. The first front end plate 101-1 blocks the front end of the medium efficiency filter channel 105-1. After the airflow flows to the end of the medium efficiency filter channel 105-1, it is blocked by the first rear end plate 101-2 and can pass through the medium efficiency filter plates 105-3 above and below to enter the second guide channel 105-2; the first rear end plate 101-2 blocks the front end of the second guide channel 105-2. The air flows from the second guide channel 105-2 to the high efficiency filter channel 106-1. After being blocked by the second rear end plate 108-2, it can pass through the high efficiency filter plates 106-3 above and below for high efficiency filtration, and then be discharged from the air outlet channel 106-2.

[0049] In order to improve the installation stability of the coarse-effect filter plate 103-3, the medium-effect filter plate 105-3 and the high-efficiency filter plate 106-3, the first front end plate 101-1, the first rear end plate 101-2, the second front end plate 108-1 and the second rear end plate 108-2 are provided with installation grooves on the top and bottom of the side facing the air flow inlet and the top and bottom of the side facing the air flow outlet, and a gap is left between the two installation grooves to form a channel. Similarly, the first top sealing plate 104-1 and the second top sealing plate 104-2 are provided with installation grooves on the side facing the air flow inlet. Mounting grooves are provided on the bottom of the side and the bottom facing the air flow outlet. Mounting grooves are provided on the top of the first bottom sealing plate 107-1 and the second bottom sealing plate 107-2 facing the air flow inlet and the top facing the air flow outlet. The ends of the coarse filter plate 103-3, the medium efficiency filter plate 105-3 and the high efficiency filter plate 106-3 are all installed in the corresponding mounting grooves. At the same time, the coarse filter plate 103-3, the medium efficiency filter plate 105-3 and the high efficiency filter plate 106-3 all have a wavy structure, which increases the filtration area.

[0050] In this embodiment, the air flow enters the air flow channel from the air inlet channel 103-1, and after the air flow reaches BB, it is blocked by the first top sealing plate 104-1, the first bottom sealing plate 107-1 and the second front end plate 108-1, and then passes through the coarse filter plate 103-3 upward and downward respectively to enter the first guide channel 103-2, completing the first level of coarse filtration of the air, and flows to the medium efficiency filtration channel 105-1. After the air flow reaches CC, it is blocked by the first rear end plate 101-2, and then passes through the medium efficiency filter plate 105-3 upward and downward respectively to enter the second guide channel 105-2, completing the second level of medium efficiency filtration of the air, and flows to the high efficiency filtration channel 106-1. When the air flow reaches DD, it is blocked by the second top sealing plate 104-2, the second bottom sealing plate 107-2 and the second rear end plate 108-2, and then passes through the high efficiency filter plate 106-3 upward and downward respectively to enter the air outlet channel 106-2, completing the third level of high efficiency filtration of the air and being discharged. The air flow direction can be referred to Figure 2 Indicated by the arrow direction.

[0051] Reference Figure 9-11, the coarse filter plate 103-3, the medium filter plate 105-3 and the high efficiency filter plate 106-3 are made of chemical fiber and glass fiber materials, and are pleated and shaped with metal lining mesh on both sides; the high efficiency filter plate 106-3 is a HEPA-grade high efficiency filter plate 106-3, the filter element housing 102, the top sealing plate assembly 104, the bottom sealing plate assembly 107, a plurality of first end sealing plate assemblies 101 and the second end sealing plate assembly 108 are integrally injection molded, and the material is ABS engineering plastic. The first end sealing plate assembly 101 and the second end sealing plate assembly 108 have the same structure and the same connection method. The top sealing plate assembly 104 and the bottom sealing plate assembly 107 have the same structure and the same connection method as the first end sealing plate assembly 101. The following example illustrates, wherein the first front end plate 101-1 and the first front end plate 101-1 are connected to the first end plate assembly 101. Two glue injection tubes are fixedly connected between the first rear end plate 101-2, and a glue injection tube is fixedly connected to the other side of the first rear end plate 101-2. Glue injection grooves are left on the upper and lower edges of the first front end plate 101-1 and the first rear end plate 101-2, which are connected to the above-mentioned mounting grooves. A glue outlet is provided at one end of the glue injection tube, which is located at port A-port J in the figure, and the other end is connected to the holes on the first front end plate 101-1 and the first rear end plate 101-2. After the components are assembled and positioned according to the figure, the adhesive glue is injected into the glue injection grooves of the top sealing plate assembly 104, the bottom sealing plate assembly 107, the first end sealing plate assembly 101 and the second end sealing plate assembly 108 through port A-port J in the figure, so that the corresponding filter plates are bonded and fixed and sealed. Ports A-port J are all connected to the inlet end face and outlet end face of the filter element through each injection tube. During bonding, one side of each sealing plate assembly is first bonded and fixed to each level of filter plates through the glue injection tubes on the air flow inlet end face; after the glue solidifies, glue is injected into the other side of each sealing plate assembly from the glue injection tubes on the air flow outlet end face to achieve bonding and fixation of the filter plates, and all materials of the entire filter element are firmly bonded.

[0052] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0053] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0055] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0056] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A multi-stage combined air filter element, characterized in that: The filter element housing (102) comprises an air flow channel in the middle portion thereof and extends to both ends thereof to form an air flow inlet and an air flow outlet; The air flow channel is provided with a coarse-effect filter section (103), a medium-effect filter section (105) and a high-efficiency filter section (106) in sequence along the airflow direction; The coarse filter section (103) is provided with a plurality of air inlet channels (103-1) and first flow guide channels (103-2) arranged alternately up and down, the air inlet channels (103-1) are connected to the air flow inlet, and a coarse filter plate (103-3) is provided between adjacent air inlet channels (103-1) and first flow guide channels (103-2); The medium-efficiency filtration section (105) is provided with a plurality of medium-efficiency filtration channels (105-1) and second diversion channels (105-2) arranged alternately up and down, a medium-efficiency filtration plate (105-3) is provided between adjacent medium-efficiency filtration channels (105-1) and second diversion channels (105-2), and the ends of the medium-efficiency filtration channels (105-1) and the first diversion channels (103-2) are in communication; The high-efficiency filter section (106) is provided with a plurality of high-efficiency filter channels (106-1) and air outlet channels (106-2) arranged alternately up and down, the air outlet channels (106-2) are connected to the air flow outlet, a high-efficiency filter plate (106-3) is provided between adjacent high-efficiency filter channels (106-1) and air outlet channels (106-2), and the high-efficiency filter channels (106-1) are connected to the end of the second guide channel (105-2).

2. A multi-stage combined air filter element according to claim 1, characterized in that: The filter element further comprises a top sealing plate assembly (104), a bottom sealing plate assembly (107), a plurality of first end sealing plate assemblies (101) and a second end sealing plate assemblies (108), wherein the top sealing plate assembly (104) is fixedly connected to the top of the air flow channel, and the bottom sealing plate assembly (107) is fixedly connected to the bottom of the air flow channel; the plurality of first end sealing plate assemblies (101) and second end sealing plate assemblies (108) are alternately arranged between the top sealing plate assembly (104) and the bottom sealing plate assembly (107) and arranged parallel to each other, and the ends of the first end sealing plate assemblies (101) and the front ends of the second end sealing plate assemblies (108) are staggered.

3. A multi-stage combined air filter element as claimed in claim 2, characterized in that: The first end sealing plate assembly (101) comprises a first front end plate (101-1) and a first rear end plate (101-2); the first front end plate (101-1) and the first rear end plate (101-2) are both fixedly connected to the inner wall of the air flow channel; the first front end plate (101-1) is connected to the front end of the first guide channel (103-2); and the first rear end plate (101-2) is connected to the end of the medium-efficiency filter channel (105-1).

4. A multi-stage combined air filter element as claimed in claim 3, characterized in that: The second end sealing plate assembly (108) includes a second front end plate (108-1) and a second rear end plate (108-2), the second front end plate (108-1) and the second rear end plate (108-2) are both fixedly connected to the inner wall of the air flow channel, the second front end plate (108-1) is connected to the end of the air inlet channel (103-1) between the top and bottom of the air flow channel, and the second rear end plate (108-2) is connected to the end of the high-efficiency filtration channel (106-1) between the top and bottom of the air flow channel.

5. The multi-stage combined air filter element according to claim 2, characterized in that: The top sealing plate assembly (104) comprises a first top sealing plate (104-1) and a second top sealing plate (104-2) fixedly connected to the inner wall of the top of the air flow channel and parallel to each other, the first top sealing plate (104-1) being connected to the end of the air inlet channel (103-1) at the top of the air flow channel, and the second top sealing plate (104-2) being connected to the end of the high-efficiency filter channel (106-1) at the top of the air flow channel.

6. The multi-stage combined air filter element according to claim 2, characterized in that: The bottom sealing plate assembly (107) comprises a first bottom sealing plate (107-1) and a second bottom sealing plate (107-2) fixedly connected to the inner wall of the bottom of the air flow channel and parallel to each other, the first bottom sealing plate (107-1) being connected to the end of the air inlet channel (103-1) at the bottom of the air flow channel, and the second bottom sealing plate (107-2) being connected to the end of the high-efficiency filter channel (106-1) at the bottom of the air flow channel.

7. The multi-stage combined air filter element according to claim 4, characterized in that: The first front end plate (101-1), the first rear end plate (101-2), the second front end plate (108-1) and the second rear end plate (108-2) are all provided with mounting grooves.

8. A multi-stage combined air filter element according to any one of claims 1 to 7, characterized in that: The coarse-effect filter plate (103-3), the medium-effect filter plate (105-3) and the high-efficiency filter plate (106-3) all have a wavy structure.

9. The multi-stage combined air filter element according to claim 8, characterized in that: The diameters of the filter holes on the coarse-effect filter plate (103-3), the medium-effect filter plate (105-3) and the high-efficiency filter plate (106-3) decrease in sequence.

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