A primary air filter for high dust storm environments that is resistant to clogging and easy to maintain, and its preparation method.

Abstract

This invention relates to the technical field of air purification and discloses a pre-filter for high dust storm environments that is resistant to clogging and easy to maintain. The filter includes an installation mechanism comprising a main frame with side slots on both sides and a strip groove at the bottom. A magnetic sealing strip is located within the strip groove, and a positioning docking block is located within the main frame. The filter also includes a composite gradient filter layer mechanism, comprising an inner frame containing a coarse interception and flow guiding layer, a high dust-holding adhesive adsorption layer, and a strength-supporting flow equalization layer, stacked sequentially. The inner frame has a folding handle, a positioning docking groove, a reverse installation groove, and a limiting groove. The advantages of this invention are: by setting up a modular quick-installation structure for the installation mechanism and the composite gradient filter layer mechanism, precise positioning is achieved using the side slots, positioning docking block, and positioning docking groove. Combined with the tight seal between the magnetic sealing strip and the inner frame, the installation efficiency and sealing reliability of the filter are effectively improved.

Description

Technical Field

[0001] This invention relates to the technical field of air purification, and in particular to a primary air filter that is resistant to clogging and easy to maintain in high dust storm environments, and its preparation method. Background Technology

[0002] Pre-filters are the first pre-filtration barrier in air purification systems, primarily used to filter particulate matter larger than 5 micrometers in diameter (such as dust, pollen, and lint). They are characterized by simple structure, low initial resistance, large dust holding capacity, and low cost. They typically use non-woven fabric, nylon mesh, or metal mesh as filter media and are widely used in the pre-filtration of air conditioning and ventilation systems to protect the more efficient medium-efficiency or high-efficiency filters downstream, extending their service life.

[0003] In regions like the Middle East and North Africa, where sandstorms are frequent, traditional primary air filters used in HVAC and industrial ventilation systems suffer from numerous insurmountable technical defects. First, ordinary non-woven filter media are prone to rapid clogging in high-dust-concentration environments, causing a sharp increase in resistance within hours. This leads to a drastic reduction in system airflow, soaring energy consumption, and even system shutdowns. Second, the continuous impact of high-speed sand particles can easily penetrate thin filter media, allowing fine sand to penetrate downstream precision equipment and cause irreversible damage. Third, the cost of replacing disposable filter cartridges is high, and outdoor replacement operations in severe weather pose significant safety risks. Finally, existing washable filters are prone to filter media deformation and performance degradation after washing, failing to meet the requirements for long-term reliable use. These defects not only increase the total life-cycle cost of the system but also seriously threaten the stable operation of equipment and the safety of personnel. Summary of the Invention

[0004] In view of the problems existing in the current primary air filters that are resistant to clogging and easy to maintain in high dust storm environments, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a primary air filter that is resistant to clogging and easy to maintain in high dust storm environments.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including, The installation mechanism includes a main frame, side slots on both sides of the main frame, a strip groove at the bottom, a magnetic sealing strip inside the strip groove, and a positioning docking block inside the main frame. A composite gradient filter layer mechanism includes an inner frame, within which a coarse interception and diversion layer, a high dust-holding and adhesive adsorption layer, and a strength support and flow equalization layer are stacked in sequence. The inner frame is provided with a folding handle, a positioning docking groove, a reverse installation groove, and a limiting groove. The composite gradient filter layer mechanism is embedded in the installation mechanism through a side slot. The positioning docking groove cooperates with the positioning docking block to achieve positioning. The magnetic sealing strip fits with the inner frame to achieve sealing.

[0007] As a preferred embodiment of the high dust storm environment anti-clogging and easy-to-maintain primary air filter of the present invention, the coarse interception and guiding layer is a stainless steel wire woven mesh or engineering plastic grid, and its surface is corrugated or wave-shaped three-dimensional protrusions, which are used to change the airflow direction and intercept large dust particles.

[0008] As a preferred embodiment of the high dust storm environment anti-clogging and easy-to-maintain primary air filter of the present invention, the high dust-holding adhesive adsorption layer includes a dust-adhesive body, which is a multi-layer composite open-pore polymer foam or a three-dimensional interwoven coarse non-woven fabric, with interconnected microchannels formed inside. Dust mainly adheres to the channel walls, while the middle of the channel remains unobstructed.

[0009] As a preferred embodiment of the high dust storm environment anti-clogging and easy-to-maintain primary air filter of the present invention, wherein: the surface of the dust sticky body is impregnated or sprayed with an environmentally resistant adhesive coating, the adhesive coating is based on silicone modified acrylic resin, compounded with plant derivative tackifiers and UV stabilizers, and has high initial tack, weather resistance and hydrophobicity.

[0010] As a preferred embodiment of the high dust storm environment anti-clogging and easy-to-maintain primary air filter of the present invention, wherein: the strength support flow equalization layer is a galvanized steel plate perforated mesh or a diamond-shaped metal support mesh with finer pore size, used to provide rigid support for the high dust-holding and sticky adsorption layer and to make the airflow pass through evenly.

[0011] As a preferred embodiment of the high dust storm environment anti-clogging and easy-to-maintain primary air filter of the present invention, the main frame and the inner frame are both symmetrical structures, and the composite gradient filter layer mechanism can be taken out from the side slot, rotated 180 degrees and reinstalled through the reverse installation slot to extend the service life.

[0012] As a preferred embodiment of the high dust storm environment anti-clogging and easy-to-maintain primary air filter of the present invention, the main frame is made of aluminum alloy profile or galvanized steel plate, and the four corners are reinforced with mortise and tenon and buckle to ensure that it will not deform after repeated disassembly and assembly.

[0013] As a preferred embodiment of the pre-filter for high dust storm environments described in this invention, the inner frame is equipped with a folding handle and a pre-installed differential pressure gauge installation interface. A mechanical red pop-up indicator can be optionally installed to indicate the filter's clogging status.

[0014] As a preferred embodiment of the high dust storm environment resistant and easy-to-maintain primary air filter of the present invention, the filter can be used in conjunction with an offline pulse air blowing cleaning station or an online water mist cleaning system to realize the regeneration and reuse of the composite gradient filter layer mechanism.

[0015] The present invention also provides a preparation method.

[0016] This invention provides the following technical solution: a preparation method, comprising the aforementioned high-dust-storm environment-resistant and easy-to-maintain primary air filter, the method comprising the following steps: S1: Prepare the installation mechanism, using aluminum alloy profiles or galvanized steel plates to cut and form the main frame, process side slots on both sides of the main frame, process strip grooves at the bottom, install magnetic sealing strips in the side slots, install positioning docking blocks in the strip grooves, and reinforce the four corners of the main frame with mortise and tenon joints and buckles. S2: Prepare the inner frame of the composite gradient filter layer mechanism, and process the folding handle, positioning docking groove, reverse installation groove and limiting groove; process the stainless steel wire woven mesh or engineering plastic grid into a corrugated three-dimensional protrusion to form a coarse interception and guiding layer; mold the open-cell polymer foam or coarse non-woven fabric into a dust-adhesive body with microchannels, and impregnate or spray an environmentally resistant adhesive coating on its surface; process the galvanized steel plate perforated mesh or diamond metal support mesh to form a strength support flow equalization layer; S3: The coarse interception and diversion layer, the high dust holding capacity and adhesive adsorption layer, and the strength support and flow equalization layer are stacked and embedded into the inner frame in sequence, and fixed into one piece by hot pressing or bonding process to form a composite gradient filter layer structure. S4: The composite gradient filter layer mechanism is embedded into the installation mechanism through the side slot, so that the positioning docking slot and the positioning docking block are precisely matched, and the magnetic sealing strip is tightly fitted with the inner frame, completing the overall assembly of the filter.

[0017] The beneficial effects of this invention are as follows: By setting up a modular quick-installation structure with an installation mechanism and a composite gradient filter layer mechanism, precise positioning is achieved by using side slots, positioning docking blocks and positioning docking grooves. Combined with the fit and sealing of the magnetic sealing strip and the inner frame, the installation efficiency and sealing reliability of the filter are effectively improved. At the same time, it provides a convenient structural basis for subsequent maintenance and regeneration. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .

[0019] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0020] Figure 3 This is a schematic diagram of the installation mechanism and the composite gradient filter layer mechanism of the present invention.

[0021] Figure 4 This is a schematic diagram of the installation mechanism of the present invention.

[0022] Figure 5 This is a schematic diagram of the composite gradient filter layer structure of the present invention.

[0023] Figure 6 This is a schematic diagram of the high dust-holding adhesive adsorption layer structure of the present invention.

[0024] Figure 7 This is a schematic diagram of the microchannel structure of the present invention.

[0025] In the diagram: 100, Installation mechanism; 110, Main frame; 120, Side slot; 130, Strip groove; 140, Magnetic sealing strip; 150, Positioning docking block; 200, Composite gradient filter layer mechanism; 210, Inner frame; 220, Coarse interception and diversion layer; 230, High dust-holding adhesive adsorption layer; 231, Dust-adhesive body; 232, Microchannel; 233, Environmentally resistant adhesive coating; 240, Strength-supporting flow equalization layer; 250, Folding handle; 260, Positioning docking groove; 270, Reverse installation groove; 280, Limiting groove. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0030] Example 1 Reference Figure 1-7 This is the first embodiment of the present invention, which provides a primary air filter that is resistant to clogging and easy to maintain in high dust storm environments. This device includes... The mounting mechanism 100 includes a main frame 110, with side slots 120 on both sides of the main frame 110, a strip groove 130 at the bottom, a magnetic sealing strip 140 inside the strip groove 130, and a positioning docking block 150 inside the main frame 110. The composite gradient filter layer mechanism 200 includes an inner frame 210, within which a coarse interception and flow guiding layer 220, a high dust holding capacity and adhesive adsorption layer 230, and a strength support and flow equalization layer 240 are stacked sequentially. The inner frame 210 is provided with a folding handle 250, a positioning docking groove 260, a reverse installation groove 270, and a limiting groove 280. The composite gradient filter layer mechanism 200 is embedded into the installation mechanism 100 through the side slot 120. The positioning docking groove 260 cooperates with the positioning docking block 150 to achieve positioning. The magnetic sealing strip 140 fits with the inner frame 210 to achieve sealing.

[0031] The modular quick-installation structure of the installation mechanism 100 and the composite gradient filter layer mechanism 200, along with the side slot 120, positioning docking block 150 and positioning docking groove 260, enables precise positioning. Combined with the fit and seal between the magnetic sealing strip 140 and the inner frame 210, the installation efficiency and sealing reliability of the filter are effectively improved, while providing a convenient structural foundation for subsequent maintenance and regeneration.

[0032] Specifically, the coarse interception and diversion layer 220 is a stainless steel wire woven mesh or engineering plastic grid with a corrugated or wave-shaped three-dimensional protrusion on its surface, which is used to change the airflow direction and intercept large particles of sand and dust.

[0033] Among them, by adopting a coarse interception and guiding layer 220 with a corrugated or wave-shaped three-dimensional protrusion, the flow direction of the dust-laden airflow is changed, so that large particles of sand and dust are effectively intercepted under inertial action, avoiding the direct impact of sand particles on the core filter layer, and significantly improving the filter's anti-clogging ability and service life.

[0034] Furthermore, the high dust-holding adhesive adsorption layer 230 includes a dust-adhesive body 231, which is a multi-layered composite open-cell polymer foam or a three-dimensional interwoven coarse non-woven fabric. It has interconnected microchannels 232 inside, where sand and dust mainly adhere to the channel walls, and the middle of the channel remains unobstructed.

[0035] The high dust-holding adhesive adsorption layer 230 features a through-channel microchannel 232 design, which allows dust to adhere mainly to the channel wall while keeping the middle of the channel unobstructed. This effectively slows down the rate of resistance increase and maintains stable ventilation performance even in environments with high dust concentrations, thus extending the maintenance cycle.

[0036] Preferably, the surface of the adhesive body 231 is impregnated or sprayed with an environmentally resistant adhesive coating 233, which is based on a silicone-modified acrylic resin and compounded with plant-derived tackifiers and UV stabilizers, and has high initial tack, weather resistance and hydrophobicity.

[0037] Among them, the environmentally resistant adhesive coating 233 set on the surface of the dust-adhesive body 231 can efficiently capture fine sand at low wind speeds, while having excellent weather resistance and hydrophobicity, ensuring stable performance in high temperature, high humidity and strong ultraviolet environment, and allowing water-based cleaning, realizing the reuse of the filter.

[0038] Furthermore, the strength support flow equalization layer 240 is a galvanized steel sheet perforated mesh or diamond-shaped metal support mesh with a finer aperture, used to provide rigid support for the high dust-holding adhesive adsorption layer 230 and to ensure uniform airflow.

[0039] Among them, the strength support flow equalization layer 240 provides reliable rigid support for the high dust holding and viscous adsorption layer 230, preventing it from collapsing and deforming under high pressure differential, while ensuring that the airflow passes through the filter layer evenly, thus ensuring the stability of filtration efficiency and the safety of system operation.

[0040] Specifically, both the main frame 110 and the inner frame 210 are symmetrical structures. The composite gradient filter layer mechanism 200 can be removed from the side slot 120, rotated 180 degrees, and reinstalled through the reverse installation slot 270 to extend its service life.

[0041] The symmetrical structural design of the main frame 110 and the inner frame 210 allows the composite gradient filter layer mechanism 200 to be removed and rotated 180 degrees for reinstallation when the pressure difference reaches the threshold. The reverse airflow blows off some of the accumulated dust, effectively extending the effective service life of the filter and reducing the maintenance frequency.

[0042] Furthermore, the main frame 110 is made of aluminum alloy profiles or galvanized steel sheets, and the four corners are reinforced with mortise and tenon joints and buckles to ensure that it will not deform after repeated disassembly and assembly.

[0043] The main frame 110 is made of aluminum alloy profiles or galvanized steel plates and is reinforced with mortise and tenon joints and buckles to ensure that the frame is not easily deformed during repeated disassembly and assembly, thereby improving the structural stability and durability of the filter and adapting to the frequent maintenance needs in harsh environments.

[0044] Furthermore, the inner frame 210 integrates a folding handle 250 and has a reserved differential pressure gauge installation interface. An optional mechanical red pop-up indicator can be installed to indicate the filter's clogging status.

[0045] The folding handle 250 integrated in the inner frame 210 facilitates quick disassembly and assembly by maintenance personnel. The reserved differential pressure gauge interface and the optional mechanical red pop-out indicator can intuitively indicate the clogging status of the filter, providing a reliable basis for maintenance decisions and improving the predictability and safety of maintenance.

[0046] Furthermore, the filter can be used in conjunction with an offline pulse air cleaning station or an online water mist cleaning system to achieve the regeneration and reuse of the composite gradient filter layer mechanism 200.

[0047] This filter can be used in conjunction with an offline pulse air cleaning station or an online water mist cleaning system to regenerate the composite gradient filter layer 200 through reverse purging or water mist spraying, reducing filter material consumption and total life cycle cost, while also reducing waste generation.

[0048] During use, confirm that the main frame 110, side slots 120, magnetic sealing strips 140, and positioning docking blocks 150 of the installation mechanism 100 are free from deformation and foreign objects; check that the inner frame 210, coarse interception and diversion layer 220, high dust holding capacity viscous adsorption layer 230, and strength support flow equalization layer 240 of the composite gradient filter layer mechanism 200 are free from damage and dust accumulation. Handle the folding handle 250 of the composite gradient filter layer mechanism 200 and push it smoothly into the installation mechanism 100 along the side slot 120, so that the positioning docking slot 260 and the positioning docking block 150 are precisely engaged, ensuring that the magnetic sealing strip 140 and the inner frame 210 are tightly fitted, achieving zero leakage sealing. Install a differential pressure gauge at the differential pressure gauge interface or enable the red pop-up indicator to monitor changes in filter resistance in real time. When the differential pressure reaches 1.5-2 times the initial resistance, perform a reverse or regeneration operation. Shut down the system, remove the composite gradient filter layer mechanism 200, turn it 180 degrees and re-embed it into the side slot 120 through the reverse installation slot 270, restore the system operation, and further utilize the dust holding space of the filter layer by using reverse airflow. When the filter resistance reaches the threshold again or is used in reverse, the composite gradient filter layer mechanism 200 is removed and placed in an offline pulse air blowing cleaning station for reverse blowing, or an online water mist cleaning system is activated for spray cleaning; after cleaning and drying, the performance is verified by a resistance-airflow test bench, and it is put back into use after passing the test. When the performance of the filter element cannot be restored to within 120% of the rated value after multiple regenerations, replace it with a new composite gradient filter layer mechanism 200 and dispose of the old filter element in accordance with environmental protection requirements.

[0049] In summary, by setting up a modular quick-installation structure of the installation mechanism 100 and the composite gradient filter layer mechanism 200, precise positioning is achieved using the side slot 120, positioning docking block 150 and positioning docking groove 260. Combined with the fit and seal between the magnetic sealing strip 140 and the inner frame 210, the installation efficiency and sealing reliability of the filter are effectively improved, while providing a convenient structural foundation for subsequent maintenance and regeneration.

[0050] Example 2 Reference Figures 1-7 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a preparation method, including a primary air filter that is resistant to clogging and easy to maintain in high dust storm environments. The method includes the following steps: S1: Prepare the installation mechanism 100, using aluminum alloy profiles or galvanized steel plates to cut and form the main frame 110, process side slots 120 on both sides of the main frame 110, process strip grooves 130 at the bottom, install magnetic sealing strips 140 in the side slots 120, install positioning docking blocks 150 in the strip grooves 130, and reinforce the four corners of the main frame 110 with mortise and tenon joints and locks. S2: Prepare the inner frame 210 of the composite gradient filter layer mechanism 200, and process the folding handle 250, positioning docking groove 260, reversing installation groove 270 and limiting groove 280; process the stainless steel wire woven mesh or engineering plastic grid into a corrugated three-dimensional protrusion to form a coarse interception and guiding layer 220; form the open-cell polymer foam or coarse non-woven fabric into a dust-adhesive body 231 with microchannels 232, and impregnate or spray an environmentally resistant adhesive coating 233 on its surface; process the galvanized steel plate perforated mesh or diamond metal support mesh to form a strength support flow equalization layer 240; S3: The coarse interception and diversion layer 220, the high dust holding capacity and adhesive adsorption layer 230 and the strength support and flow equalization layer 240 are sequentially stacked and embedded into the inner frame 210, and fixed into one piece by hot pressing or bonding process to form a composite gradient filter layer structure 200. S4: The composite gradient filter layer mechanism 200 is embedded into the mounting mechanism 100 through the side slot 120, so that the positioning docking slot 260 and the positioning docking block 150 are precisely matched, and the magnetic sealing strip 140 is tightly fitted with the inner frame 210, thus completing the overall assembly of the filter.

[0051] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0052] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A pre-filter for high dust storm environments that is resistant to clogging and easy to maintain, characterized in that, include: The installation mechanism (100) includes a main frame (110), with side slots (120) on both sides and a strip groove (130) at the bottom. A magnetic sealing strip (140) is provided in the strip groove (130), and a positioning docking block (150) is provided in the main frame (110). A composite gradient filter layer mechanism (200) includes an inner frame (210), in which a coarse interception and diversion layer (220), a high dust-holding and adhesive adsorption layer (230), and a strength support and flow equalization layer (240) are stacked in sequence. The inner frame (210) is provided with a folding handle (250), a positioning docking groove (260), a reverse installation groove (270), and a limiting groove (280). The composite gradient filter layer mechanism (200) is embedded into the installation mechanism (100) through the side slot (120). The positioning docking groove (260) cooperates with the positioning docking block (150) to achieve positioning. The magnetic sealing strip (140) fits with the inner frame (210) to achieve sealing.

2. The pre-filter for high dust storm environments that is resistant to clogging and easy to maintain, as described in claim 1, is characterized in that: The coarse interception and diversion layer (220) is a stainless steel wire woven mesh or an engineering plastic grid with a corrugated or wave-shaped three-dimensional protrusion on its surface, which is used to change the airflow direction and intercept large particles of sand and dust.

3. The high-dust-storm environment anti-clogging and easy-to-maintain primary air filter according to claim 2, characterized in that: The high dust-holding adhesive adsorption layer (230) includes a dust-adhesive body (231), which is a multi-layer composite open-cell polymer foam or a three-dimensional interwoven coarse non-woven fabric. It has a through-channel (232) inside, where sand and dust mainly adhere to the channel wall and the middle of the channel remains unobstructed.

4. The pre-filter for high dust storm environments that is resistant to clogging and easy to maintain, as described in claim 3, is characterized in that: The surface of the dust-adhesive body (231) is impregnated or sprayed with an environmentally resistant adhesive coating (233), which is based on a silicone-modified acrylic resin and compounded with plant-derived tackifiers and UV stabilizers, and has high initial tack, weather resistance and hydrophobicity.

5. The pre-filter for high dust storm environments that is resistant to clogging and easy to maintain, as described in claim 4, is characterized in that: The strength support flow equalization layer (240) is a galvanized steel perforated mesh or a diamond-shaped metal support mesh with a finer aperture, used to provide rigid support for the high dust-holding adhesive adsorption layer (230) and to make the airflow pass through evenly.

6. The pre-filter for high dust storm environments that is resistant to clogging and easy to maintain, as described in claim 5, is characterized in that: Both the main frame (110) and the inner frame (210) are symmetrical structures. The composite gradient filter layer mechanism (200) can be taken out from the side slot (120), rotated 180 degrees and reinstalled through the reverse installation slot (270) to extend its service life.

7. The pre-filter for high dust storm environments that is resistant to clogging and easy to maintain, as described in claim 6, is characterized in that: The main frame (110) is made of aluminum alloy profiles or galvanized steel plates, and the four corners are reinforced with mortise and tenon joints and buckles to ensure that it will not deform after repeated disassembly and assembly.

8. The pre-filter for high dust storm environments that is resistant to clogging and easy to maintain, as described in claim 7, is characterized in that: The inner frame (210) is integrated with a folding handle (250) and has a reserved differential pressure gauge installation interface. A mechanical red pop-up indicator can be optionally installed to indicate the clogging status of the filter.

9. The pre-filter for high dust storm environments that is resistant to clogging and easy to maintain, as described in claim 8, is characterized in that: The filter can be used in conjunction with an offline pulse air cleaning station or an online water mist cleaning system to achieve the regeneration and reuse of the composite gradient filter layer structure (200).

10. A preparation method, characterized in that: The method for using a primary air filter designed for high dust storm environments, as described in any one of claims 1 to 9, comprises the following steps: S1: Prepare the installation mechanism (100), using aluminum alloy profiles or galvanized steel plates to cut and form the main frame (110), process side slots (120) on both sides of the main frame (110), process strip grooves (130) at the bottom, install magnetic sealing strips (140) in the side slots (120), install positioning docking blocks (150) in the strip grooves (130), and reinforce the four corners of the main frame (110) with mortise and tenon joints and locks; S2: Prepare the inner frame (210) of the composite gradient filter layer mechanism (200), and process the folding handle (250), positioning docking groove (260), reversing installation groove (270) and limiting groove (280); process the stainless steel wire woven mesh or engineering plastic grid into a corrugated three-dimensional protrusion to form a coarse interception and guiding layer (220); form the open-cell polymer foam or coarse non-woven fabric into a dust-adhesive body (231) with microchannels (232), and impregnate or spray the surface of it with an environmentally resistant adhesive coating (233); process the galvanized steel plate perforated mesh or diamond metal support mesh to form a strength support flow equalization layer (240). S3: The coarse interception and diversion layer (220), the high dust holding capacity and adhesive adsorption layer (230) and the strength support flow equalization layer (240) are stacked and embedded into the inner frame (210) in sequence, and fixed into one piece by hot pressing or bonding process to form a composite gradient filter layer structure (200). S4: The composite gradient filter layer mechanism (200) is embedded into the installation mechanism (100) through the side slot (120), so that the positioning docking slot (260) and the positioning docking block (150) are precisely matched, and the magnetic sealing strip (140) is tightly fitted with the inner frame (210), thus completing the overall assembly of the filter.

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