A nitrogen generator cooling device

Abstract

The utility model discloses a kind of nitrogen generator cooling device, including air compressor, preliminary filter, air-cooled precooler, gas-liquid separator, fine filter, drying machine and pressure stabilizer, the inside of preliminary filter and fine filter is fixedly connected with dispersion disc, the inside of preliminary filter and fine filter is equipped with the processing assembly for filter medium, the pipeline series connection design of the utility model through air compressor, preliminary filter, air-cooled precooler, gas-liquid separator, fine filter, drying machine and pressure stabilizer, form a complete and rigorous gas processing link, compressed gas sequentially passes preliminary filter and removes large particle impurities, precooling reduces temperature and promotes liquid substance condensation, gas-liquid separation removes liquid component, fine filter intercepts small particle, drying reduces water content, finally, pressure is stabilized by pressure stabilizer and is stored, layer by layer progressive processing, effectively improve the purity and pressure stability of gas, provide high-quality stable gas source for nitrogen generator, guarantee its reliable operation.

Description

Technical Field

[0001] This utility model mainly relates to the field of auxiliary equipment technology for nitrogen generators, specifically a nitrogen generator cooling device. Background Technology

[0002] In the field of nitrogen generator auxiliary equipment technology, the nitrogen generator cooling device refers to the core equipment used to pre-treat compressed air. It provides a pure and stable air source for the nitrogen generator by integrating functions such as filtration, pre-cooling, gas-liquid separation, and drying.

[0003] Among the various functional modules of a nitrogen generator cooling system, the filtration component is usually the core component that determines the quality of the gas source. Because nitrogen generators have extremely high requirements for the purity of the input gas, insufficient precision of the filtration component will result in impurities remaining in the nitrogen, which will not meet the needs of industrial production. The filtration components of traditional cooling systems are mostly single-layer designs, without forming a graded treatment process of preliminary filtration → fine filtration. The filtration lacks specificity, resulting in the fine filter element being overloaded and easily clogged, or integrated into a single filter canister, leading to impurities remaining in the gas source and high filter element maintenance costs. Utility Model Content

[0004] This utility model addresses the problem of overly simplistic existing solutions by providing a nitrogen generator cooling device. This device solves the technical problems mentioned in the background section, where traditional cooling devices integrate the filter components into a single filter canister or employ a single-layer design, lacking tiered filtration, which leads to residual gas source impurities and high filter element maintenance costs.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A nitrogen generator cooling device includes an air compressor, a preliminary filter, an air-cooled precooler, a gas-liquid separator, a fine filter, a dryer, and a pressure stabilizing tank. The preliminary filter and the fine filter are both fixedly connected to a dispersion plate. The preliminary filter and the fine filter are both equipped with a processing component for the filter medium. The processing component is located above the dispersion plate.

[0007] The processing assembly includes a first filter frame, a second filter frame, and a pressure cap. The second filter frame is slidably connected to the corresponding sliders at both ends of the inner wall of the first filter frame via grooves at both ends of its outer wall. The pressure cap is fixedly connected to the first filter frame.

[0008] Furthermore, the air outlet of the air compressor is connected to the air inlet of the preliminary filter through a pipe, which is used to transport the compressed gas from the air compressor to the preliminary filter for initial filtration. The air outlet of the preliminary filter is connected to the air inlet of the air-cooled precooler through a pipe for pre-cooling treatment. The air outlet of the air-cooled precooler is connected to the air inlet of the gas-liquid separator through a pipe to separate the liquid substances contained in the gas.

[0009] Furthermore, the outlet of the gas-liquid separator is connected to the inlet of the fine filter via a pipe, and the outlet of the fine filter is connected to the inlet of the dryer via a pipe to reduce the moisture content in the gas and achieve drying treatment. The outlet of the dryer is connected to the inlet of the pressure stabilizing tank via a pipe to stabilize the gas pressure and store the gas.

[0010] Furthermore, the inner wall of the fine filter is provided with a positioning member at an equal angle near the tank opening for fixing with the pressure cap. The positioning member has a first threaded hole on its end face facing the pressure cap, and the pressure cap has a second threaded hole at the corresponding position. The two threaded holes are coaxially arranged and fixedly connected by a hexagonal bolt. The surface of the pressure cap extends outward from the axis of the second threaded hole to form a groove. The groove is used for threaded connection with the shaft head sleeve, so that the shaft head sleeve is fitted onto the outside of the shaft head at the top of the hexagonal bolt.

[0011] Furthermore, the internal structure of the preliminary filter is the same as that of the fine filter, and a barrier pad is fixed at the bottom of the fine filter tank cover. A first exhaust pipe passes through the axis of the barrier pad, and a second exhaust pipe is fixed at the top of the cover. The lower end of the second exhaust pipe passes through the bottom of the cover, and the top end is inserted into a slot opened by the barrier pad extending outward along the axis. The bottom of the first exhaust pipe extends into the second exhaust pipe.

[0012] Furthermore, the dispersion disc is located below the air inlet pipes of both the preliminary filter and the fine filter, and the surface of the dispersion disc is distributed with multiple through holes for gas flow. The top of the dispersion disc is annularly welded with a support column for supporting the processing components.

[0013] Furthermore, the first filter frame and the second filter frame adopt a coaxial nested structure. The first filter frame is a double-layer structure with an annular cavity formed between the inner and outer layers. The second filter frame is a single-layer structure with its outer diameter matching the inner diameter of the inner layer of the first filter frame. The inner and outer layers of the first filter frame are provided with hollow structures arranged at equal angles, and the bottom plane is evenly distributed with hollow areas along the circumference. The surface of the second filter frame is also provided with hollow surfaces corresponding to the hollow surfaces of the first filter frame. The bottom of the second filter frame is a solid structure with a cavity for installing the filter element inside.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. Through a series of pipelines connecting the air compressor, primary filter, air-cooled precooler, gas-liquid separator, fine filter, dryer, and pressure stabilizing tank, a complete and rigorous gas processing chain is formed. Compressed gas sequentially passes through primary filtration to remove large particulate impurities, precooling to lower the temperature and promote the condensation of liquid substances, gas-liquid separation to remove liquid components, fine filtration to intercept tiny particles, drying to reduce moisture content, and finally pressure stabilization and storage in the pressure stabilizing tank. This progressive processing effectively improves the purity and pressure stability of the gas, providing a high-quality and stable gas source for the nitrogen generator and ensuring its reliable operation.

[0016] 2. At the same time, the equipment has the advantage of convenient maintenance. The processing components adopt a coaxial nesting and sliding fit structure of the first filter frame and the second filter frame, which is easy to disassemble and install. When the filter element needs to be replaced, it is only necessary to close the corresponding pipeline valve and remove the bolts between the cover and the positioning part to separate the cover and the filter frame, and easily take out the old filter element for cleaning and maintenance. This structural design not only reduces the difficulty of maintenance, but also reduces maintenance time and cost, and improves the practicality of the equipment.

[0017] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the fine filter of this utility model;

[0020] Figure 3 This is a schematic diagram of the processing component structure of this utility model;

[0021] Figure 4 This is a partial structural schematic diagram of the present invention.

[0022] Numbering on the map:

[0023] 1. Air compressor; 2. Preliminary filter; 3. Air-cooled precooler; 4. Gas-liquid separator; 5. Fine filter; 501. Positioning component; 502. Barrier pad; 6. Dryer; 7. Pressure stabilizing tank; 8. Dispersion disc; 9. Processing assembly; 901. First filter frame; 902. Second filter frame; 903. Pressure cap; 904. Shaft head sleeve. Detailed Implementation

[0024] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Please refer to the appendix carefully. Figure 1-4 A nitrogen generator cooling device includes an air compressor 1, a preliminary filter 2, an air-cooled precooler 3, a gas-liquid separator 4, a fine filter 5, a dryer 6, and a pressure stabilizing tank 7. The preliminary filter 2 and the fine filter 5 are both fixedly connected to a dispersion plate 8. The preliminary filter 2 and the fine filter 5 are both provided with a processing component 9 for the filter medium. The processing component 9 is located above the dispersion plate 8.

[0027] The processing component 9 includes a first filter frame 901, a second filter frame 902, and a pressure cap 903. The second filter frame 902 is slidably connected to the corresponding sliders at both ends of the inner wall of the first filter frame 901 through sliding grooves opened at both ends of its outer wall. The pressure cap 903 is fixedly connected to the first filter frame 901.

[0028] With the above structure, both the preliminary filter 2 and the fine filter 5 are equipped with drain ports at the bottom, and are also equipped with pressure sensors and temperature sensors. The pressure sensors are respectively located at the top and bottom of the tank, i.e., above and below the processing component 9, to calculate the pressure difference. A liquid level sensor is also provided to monitor the amount of liquid accumulated at the bottom of the tank to prevent the liquid from submerging the filter element. The edge of the pressure cap 903 is made of silicone, and the edge of the pressure cap 903 is made of fluororubber, which has good deformation and recovery capabilities. It can fit tightly against the inner wall of the filter, effectively preventing gas leakage, ensuring stable pressure during the filtration process, and improving the sealing performance of the nitrogen generator cooling device.

[0029] In this embodiment, as Figure 1 As shown, the outlet of the air compressor 1 is connected to the inlet of the primary filter 2 through a pipe, which is used to transport the compressed gas from the air compressor 1 to the primary filter 2 for initial filtration. The outlet of the primary filter 2 is connected to the inlet of the air-cooled precooler 3 through a pipe for pre-cooling treatment. The outlet of the air-cooled precooler 3 is connected to the inlet of the gas-liquid separator 4 through a pipe to separate the liquid substances contained in the gas.

[0030] Through the above structure, the air compressor 1 is connected in series with the pipelines of the primary filter 2, the air-cooled precooler 3, and the gas-liquid separator 4 to form a continuous processing link of compression-primary filtration-precooling-liquid removal. This ensures that the compressed gas passes through the primary filter to remove large particulate impurities and the precooling to reduce the temperature and promote the condensation of liquid substances, providing a high-quality gas source for subsequent fine filtration and drying.

[0031] In this embodiment, as Figure 1 As shown, the outlet of the gas-liquid separator 4 is connected to the inlet of the fine filter 5 through a pipe, and the outlet of the fine filter 5 is connected to the inlet of the dryer 6 through a pipe to reduce the water content in the gas and achieve drying treatment. The outlet of the dryer 6 is connected to the inlet of the pressure stabilizing tank 7 through a pipe to stabilize the gas pressure and store the gas.

[0032] Through the above structure, the gas-liquid separator 4, fine filter 5, dryer 6 and pressure stabilizing tank 7 are connected in series to form a progressive treatment process of liquid removal-fine filtration-drying-pressure stabilization, which reduces the water content and impurities in the gas layer by layer, ensuring the purity and pressure stability of the output gas, providing a continuous and stable gas source for the nitrogen generator and improving operational reliability.

[0033] In this embodiment, as Figure 2 , Figure 3 and Figure 4 As shown, the inner wall of the fine filter 5 is provided with a positioning member 501 at an equal angle near the tank opening for fixing to the pressure cap 903. The positioning member 501 has a first threaded hole on the end face facing the pressure cap 903, and the pressure cap 903 has a second threaded hole at the corresponding position. The two threaded holes are coaxially arranged and fixedly connected by a hexagonal bolt. The surface of the pressure cap 903 extends outward from the axis of the second threaded hole to form a groove. The groove is used for threaded connection with the shaft head sleeve 904 so that the shaft head sleeve 904 is sleeved on the outside of the shaft head at the top of the hexagonal bolt.

[0034] With the above structure, the diameter of the gland 903 is consistent with the inner diameter of the primary filter 2 and the fine filter 5, while the diameter of the first filter frame 901 is 10mm away from the inner wall of the primary filter 2 and the fine filter 5. The positioning part 501 and the gland 903 are fixed coaxially with the thread, and the hexagonal bolts ensure the stable installation of the treatment component 9. The protection of the shaft head sleeve 904 improves the durability of the bolt connection and ensures the stable operation of the equipment. The layout of the gland 903 being adapted to the inner diameter of the primary filter 2 and the fine filter tank 5, and the first filter frame 901 having a reserved gap with the inner wall, on the one hand, achieves seamless coverage of the tank by the gland 903, enhancing the sealing effect; on the other hand, the 10mm gap is conducive to uniform gas diffusion, avoiding concentrated airflow impacting the filter element, improving filtration efficiency and filter element service life.

[0035] In this embodiment, as Figure 2 As shown, the internal structure of the preliminary filter 2 is the same as that of the fine filter 5. The bottom of the canister cover of the fine filter 5 is fixed with a barrier pad 502. A first exhaust pipe passes through the axis of the barrier pad 502. A second exhaust pipe is fixed to the top of the pressure cap 903. The lower end of the second exhaust pipe passes through the bottom of the pressure cap 903, and the top end is inserted into the slot opened by the barrier pad 502 extending outward along the axis. The bottom of the first exhaust pipe extends into the second exhaust pipe.

[0036] With the above structure, the primary filter 2 and the fine filter 5 have the same structure, which can reduce production and maintenance costs. Only the filter element is different, so the gas can be efficiently treated in the standardized filtration process, providing a stable and pure gas source for the subsequent cooling process, reducing the cooling efficiency loss caused by impurities. The sealing connection structure between the barrier gasket 502 and the dual exhaust pipes ensures that the gas flows along the predetermined path.

[0037] In this embodiment, as Figure 2 As shown, the dispersion disk 8 is located below the air inlet pipes of both the primary filter 2 and the fine filter 5. The surface of the dispersion disk 8 is distributed with multiple through holes for gas flow, and the top of the dispersion disk 8 is annularly welded with a support column for supporting the processing assembly 9.

[0038] Through the above structure, the dispersion disk 8 achieves uniform gas dispersion through the through hole structure set below the air inlet pipe, and uses the top annular support column to stably support the processing component 9, effectively improving gas filtration efficiency and equipment structural stability.

[0039] In this embodiment, as Figure 3 As shown, the first filter frame 901 and the second filter frame 902 adopt a coaxial nested structure. The first filter frame 901 has a double-layer structure with an annular cavity between the inner and outer layers. The second filter frame 902 has a single-layer structure with its outer diameter matching the inner diameter of the inner layer of the first filter frame 901. The inner and outer layers of the first filter frame 901 are provided with hollow structures arranged at equal angles, and the bottom plane is evenly distributed with hollow areas along the circumference. The surface of the second filter frame 902 is also provided with hollow surfaces corresponding to the hollow surfaces of the first filter frame 901. The bottom of the second filter frame 902 is a solid structure with a cavity for installing the filter element inside.

[0040] With the above structure, metal mesh is installed at the bottom of the first filter frame 901 and on the hollowed-out surfaces of the inner and outer layers. The metal mesh at the bottom and outer layer of the first filter frame 901 in the preliminary filter 2 has a pore size of 5-10 micrometers; the inner layer has a pore size of 1-5 micrometers. A nylon filter element is installed inside the second filter frame 902. The outer layer of the first filter frame 901 in the fine filter 5 has a metal mesh pore size of 1-3 micrometers, and the inner layer has a hollow structure. A ring-shaped glass fiber filter element is embedded in the annular cavity of the inner and outer layers of the metal mesh of the first filter frame 901. A metal sintered felt screen tube is installed inside the second filter frame 902.

[0041] The coaxial nesting and sliding fit structure is adopted to achieve a tight combination of the first filter frame 901 and the second filter frame 902, which not only ensures stable installation, but also facilitates disassembly and maintenance. At the same time, the metal mesh with different pore sizes in the preliminary filter 2 and the fine filter tank 5 work together with the multi-layer filter element to filter from the interception of large particles in the preliminary filter to the removal of tiny impurities in the fine filter, which significantly improves the gas purification efficiency and accuracy.

[0042] The specific operating procedure of this utility model is as follows: It should be noted that in actual use, the nitrogen generator is connected after the pressure stabilizing tank 7. The outlet of the pressure stabilizing tank 7 supplies gas to the nitrogen generator. The nitrogen produced by the nitrogen generator can be transported to subsequent gas-using equipment. At the same time, the air compressor 1, the air-cooled precooler 3, the gas-liquid separator 4, the dryer 6, and the pressure stabilizing tank 7 are all existing technologies. The air compressor 1 is used to compress air, the air-cooled precooler 3 realizes gas precooling, the gas-liquid separator 4 separates liquid substances from the gas, the dryer 6 reduces the water content of the gas, and the pressure stabilizing tank 7 stabilizes the gas pressure and stores the gas. These will not be elaborated here. First, after the air compressor 1 compresses the air, it is transported to the inlet of the preliminary filter 2 through the pipeline. The gas first passes through the dispersion plate 8 located below the inlet pipe. The through holes on the surface of the dispersion plate 8 make the gas evenly dispersed. Then, the gas rises to the processing component 9.

[0043] In the processing component 9, the bottom and outer layer of the first filter frame 901 are equipped with a metal mesh with a pore size of 5-10 micrometers to intercept larger particulate impurities, and the inner layer of the metal mesh with a pore size of 1-5 micrometers further filters medium particulate impurities. At the same time, the nylon filter element inside the second filter frame 902 provides supplementary filtration for the gas.

[0044] The pre-filtered gas enters the inlet of the air-cooled precooler 3 through a pipe. The air-cooled precooler 3 pre-cools the gas by air cooling, lowering the gas temperature and causing some of the water vapor in the gas to condense into liquid water, facilitating subsequent gas-liquid separation. The pre-cooled gas is discharged from the outlet of the air-cooled precooler 3.

[0045] After preliminary filtration, the gas enters the inlet of the air-cooled precooler 3 through a pipeline. The air-cooled precooler 3 precools the gas by air cooling, reducing the gas temperature and causing some of the water vapor in the gas to condense into liquid water, which facilitates subsequent gas-liquid separation. The precooled gas is discharged from the outlet of the air-cooled precooler 3.

[0046] The pre-cooled gas enters the inlet of the gas-liquid separator 4 through a pipe. The gas-liquid separator 4 uses the principles of centrifugal force and gravity to separate the liquid substances contained in the gas, such as condensate and oil mist, from the gas. The separated liquid substances are discharged from the bottom of the gas-liquid separator 4, while the dry gas flows out from the outlet of the gas-liquid separator 4.

[0047] After gas-liquid separation, the gas enters the inlet of the fine filter 5 through a pipe. In the fine filter 5, the gas is first dispersed by the dispersion plate 8, and then rises to the processing component 9. The outer metal mesh of the first filter frame 901 of the fine filter 5 has a pore size of 1-3 micrometers, which performs preliminary fine filtration on the gas. The inner layer has a hollow structure, and a ring-shaped glass fiber filter element is embedded in the annular cavity to further intercept tiny particulate impurities. The metal sintered felt screen tube inside the second filter frame 902 performs final fine filtration on the gas, removing extremely fine particles, oil mist aerosols, etc., so that the gas reaches a high purity. The finely filtered gas flows out from the outlet of the fine filter 5.

[0048] When the filter element needs to be replaced, close the pipeline valve connected to the primary filter 2 or the fine filter 5 to prevent gas leakage. According to the corresponding tank, open the flange bolts, remove the shaft head sleeve 904 on the cover 903 one by one, and then remove the hexagonal flange bolts between the cover 903 and the positioning piece 501. With the help of the handle on the top of the cover 903, remove the cover 903 from the tank.

[0049] Using the bolts connecting the bottom of the gland 903 and the edge of the first filter frame 901, the gland 903 and the filter frame with the filter element are separated. At this time, the old filter element can be removed from the filter frame, and the metal mesh and the annular cavity can be cleaned at the same time.

[0050] When the pressure cap 903 is fixed to the first filter frame 901, the sealing gasket with elastic structure protruding at its bottom can fill the corresponding contact position of the first filter frame 901 and the second filter frame 902, and the second exhaust pipe provided at the bottom of the pressure cap 903 is correspondingly contacted with the filter element provided inside the second filter frame 902.

[0051] Install the new filter element into the corresponding position on the filter frame. Fix the bottom of the cover 903 to the first filter frame 901 and the edge through the corresponding through holes and flange bolts. Place the assembled cover 903 into the tank. Fix the cover 903 to the positioning part 501 through the hexagonal flange bolts. Then install the shaft head sleeve 904 and finally tighten the flange bolts.

[0052] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A nitrogen generator cooling device, comprising an air compressor (1), a preliminary filter (2), an air-cooled precooler (3), a gas-liquid separator (4), a fine filter (5), a dryer (6), and a pressure stabilizing tank (7), characterized in that: The preliminary filter (2) and the fine filter (5) are both fixedly connected to a dispersion disk (8), and the preliminary filter (2) and the fine filter (5) are both provided with a processing component (9) for the filter medium, which is located above the dispersion disk (8). The processing component (9) includes a first filter frame (901), a second filter frame (902), and a pressure cap (903). The second filter frame (902) is slidably connected to the corresponding sliders at both ends of the inner wall of the first filter frame (901) through the sliding grooves opened at both ends of its outer wall. The pressure cap (903) is fixedly connected to the first filter frame (901).

2. The nitrogen generator cooling device according to claim 1, characterized in that: The outlet of the air compressor (1) is connected to the inlet of the pre-filter (2) through a pipe to transport the compressed gas from the air compressor (1) to the pre-filter (2) for initial filtration. The outlet of the pre-filter (2) is connected to the inlet of the air-cooled precooler (3) through a pipe for pre-cooling treatment. The outlet of the air-cooled precooler (3) is connected to the inlet of the gas-liquid separator (4) through a pipe to separate the liquid substances contained in the gas.

3. A nitrogen generator cooling device according to claim 1, characterized in that: The outlet of the gas-liquid separator (4) is connected to the inlet of the fine filter (5) through a pipe. The outlet of the fine filter (5) is connected to the inlet of the dryer (6) through a pipe to reduce the water content in the gas and achieve drying treatment. The outlet of the dryer (6) is connected to the inlet of the pressure stabilizing tank (7) through a pipe to stabilize the gas pressure and store the gas.

4. A nitrogen generator cooling device according to claim 1, characterized in that: The inner wall of the fine filter (5) is provided with a positioning member (501) at an equal angle near the tank opening for fixing with the pressure cap (903). The positioning member (501) has a first threaded hole on the end face facing the pressure cap (903), and the pressure cap (903) has a second threaded hole at the corresponding position. The two threaded holes are coaxially arranged and fixedly connected by a hexagonal bolt. The surface of the pressure cap (903) extends outward from the axis of the second threaded hole to form a groove. The groove is used to connect with the shaft head sleeve (904) by thread, so that the shaft head sleeve (904) is sleeved on the outside of the shaft head at the top of the hexagonal bolt.

5. A nitrogen generator cooling device according to claim 1, characterized in that: The internal structure of the preliminary filter (2) is the same as that of the fine filter (5), and the bottom of the canister cover of the fine filter (5) is fixed with a barrier pad (502). A first exhaust pipe passes through the axis of the barrier pad (502), and a second exhaust pipe is fixed on the top of the pressure cap (903). The lower end of the second exhaust pipe passes through the bottom of the pressure cap (903), and the top end is inserted into the slot opened by the barrier pad (502) extending outward along the axis. The bottom of the first exhaust pipe extends into the second exhaust pipe.

6. A nitrogen generator cooling device according to claim 1, characterized in that: The dispersion disk (8) is located below the air inlet pipes of both the primary filter (2) and the fine filter (5), and the surface of the dispersion disk (8) is provided with multiple through holes for gas flow. The top of the dispersion disk (8) is annularly welded with a support column for supporting the processing assembly (9).

7. A nitrogen generator cooling device according to claim 1, characterized in that: The first filter frame (901) and the second filter frame (902) adopt a coaxial nested structure. The first filter frame (901) is a double-layer structure with an inner and outer layer forming an annular cavity. The second filter frame (902) is a single-layer structure with its outer diameter matching the inner diameter of the inner layer of the first filter frame (901). The inner and outer layers of the first filter frame (901) are provided with hollow structures arranged at equal angles, and the bottom plane is evenly distributed with hollow areas along the circumference. The surface of the second filter frame (902) is also provided with hollow surfaces corresponding to the hollow surfaces of the first filter frame (901). The bottom of the second filter frame (902) is a solid structure with a cavity for installing the filter element inside.

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