Filter cartridge and method of making same

Abstract

This invention relates to the field of environmental dust removal and discloses a filter cartridge and its manufacturing method. The filter cartridge includes a filter cartridge body with wavy pleats surrounding the sides of the body. The filter cartridge also includes a filter screen, with the filter screen portion disposed on the inner wall surface of the pleats and the filter screen portion disposed on the outer wall surface of the pleats. Gas is discharged after passing through the filter screens disposed on the inner and outer wall surfaces sequentially, or after passing through the filter screens disposed on the outer and inner wall surfaces sequentially. Filter screens are provided on both the inner and outer wall surfaces of the pleats of the filter cartridge body. Compared to existing technologies where filter screens are only disposed on the inner or outer wall surface of the filter cartridge, the filter cartridge in this solution forms a dual-channel system with the same body, but the filtration area of ​​the filter screen is doubled. By increasing the filtration area and optimizing the gas flow path, the flow resistance of gas passing through the filter screen is reduced, which means that the energy consumption required is also reduced under the same gas flow rate, thereby achieving higher energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of environmental dust removal, and more specifically to a filter cartridge and its manufacturing method. Background Technology

[0002] Currently, polymer filter cartridges, as the main filtration element for air pollution control, are playing a leading role in ultra-low emission control in the dust removal fields of the steel, smelting, and automotive industries. In recent years, with the continuous advancement of new quality productivity and high-quality development, the development of high-purity extraction and separation technologies for lithium batteries and hydrogen energy storage materials in the new energy industry, as well as laser smoke filtration and inert gas delivery in the additive manufacturing industry, all require high-quality, high-precision, and customized filter materials.

[0003] Traditional polymer filter cartridges mostly employ single-channel suction and blowing, resulting in a large internal cavity space, small practical filtration area, and high operating energy consumption. This makes them unsuitable for the innovative iteration of polymer filter cartridges and the personalized needs of emerging industries, thus suppressing the urgent demand for high-quality, high-cleanliness space filter materials brought about by the development of new productive forces. For example, patent 201610034154.1 discloses a pleated metal mesh filter cartridge. This metal mesh uses a composite structure composed of three materials, but it is essentially still a single-layer filter.

[0004] Therefore, there is a lack of a filter in the existing technology that occupies little space but has a large actual filtration area. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem of low filtration efficiency of existing filter cartridges and to provide a filter cartridge and manufacturing method. This filter cartridge has the advantages of high filtration efficiency and large actual filtration area.

[0006] To achieve the above objectives, the present invention provides a filter cartridge, including a body, the sides of which are surrounded by wavy pleats. The filter cartridge also includes a filter screen, a portion of which is disposed on the inner wall surface of the pleats and a portion of which is disposed on the outer wall surface of the pleats. Gas is discharged after passing through the filter screen disposed on the inner and outer wall surfaces in sequence, or after passing through the filter screen disposed on the outer and inner wall surfaces in sequence.

[0007] Preferably, the filter cartridge further includes an end cap, which is detachably connected to one of the upper and lower ends of the filter cartridge, and the end cap seals the edge of the corresponding end of the filter cartridge.

[0008] Preferably, the end cap includes an end cap body and a connecting portion. A groove is provided on the end cap body, and the connecting portion is disposed within the groove. The sidewall of the groove conforms to the inner or outer wall surface of the pleats, so that the sidewall of the groove fits against the inner or outer wall surface of the pleats. A suction channel is provided between the connecting portion and the end cap body, allowing gas to flow more smoothly through the filter cartridge. By optimizing the airflow path, the flow resistance of gas within the filter cartridge is reduced, thereby improving the filtration efficiency.

[0009] Preferably, the body includes a plurality of independently separated channels, the suction channels are configured corresponding to the independently separated channels, and the grooves are configured corresponding to the independently separated inner cavities of the channels, so that the grooves form sub-grooves that match the plurality of independently separated inner cavities.

[0010] Preferably, a vent hole is provided in the middle of the joint; and / or,

[0011] The filter cartridge has an opening at one of its upper and lower ends.

[0012] Preferably, the filter cartridge is a one-piece molded part, and a filter section is provided between the upper or lower ends of the pleats on the inner and outer sides of the body, so as to connect the inner and outer walls of the pleats integrally.

[0013] Preferably, a guide cover is provided above the end cap; and / or,

[0014] The folds are evenly distributed on the side of the body.

[0015] Preferably, the pore diameter of the filter screen is in the range of 8µm-13µm; and / or,

[0016] The body comprises 5-20 independently separated channels.

[0017] Preferably, the filter cartridge comprises one or more of ultra-high molecular weight polyethylene, high-density polyethylene, modified polypropylene, polyphenylene ether, polyphenylene sulfide, polytetrafluoroethylene and polyimide, silica, quartz stone and ceramic.

[0018] A second aspect of the present invention provides a method for manufacturing a filter cartridge as shown above, comprising:

[0019] Step 1: Make a mold for the filter cartridge, the mold being adapted to form the wavy pleats (2).

[0020] Step 2: Mix the polymer raw materials according to the specified ratio and then pour the mixture into the mold;

[0021] Step 3: Place the mold from Step 2 into a sintering furnace, calcine at high temperature, hold at that temperature, and then cool.

[0022] The above technical solution provides filter screens on both the inner and outer walls of the pleated body of the filter cartridge. Compared with the existing technology where filter screens are only provided on the inner or outer walls of the filter cartridge, the filter cartridge in this solution occupies the same volume, forming a dual channel with both inner and outer channels. The filtration area of ​​the filter screen is doubled, which improves the filtration efficiency of the filter cartridge and reduces the cost of filtration. Attached Figure Description

[0023] Figure 1 This is an exploded structural diagram of the filter cartridge according to an embodiment of the present invention.

[0024] Figure 2 This is a first-view perspective three-dimensional structural diagram of the filter cartridge according to an embodiment of the present invention.

[0025] Figure 3 This is a two-dimensional structural schematic diagram of the filter cartridge from a second perspective according to an embodiment of the present invention.

[0026] Figure 4 This is a top view of the filter cartridge according to an embodiment of the present invention.

[0027] Figure 5 This is a distribution diagram of the inner diameter of the filter cartridge according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures

[0029] 100 filter cartridge

[0030] 1 body

[0031] 2 folds

[0032] 3 filters

[0033] 4 end caps

[0034] 41 end cover body

[0035] 42 Joint

[0036] 421 ventilation holes

[0037] 43 grooves

[0038] 431 sub-groove

[0039] 44 Sealing Ring Groove

[0040] 5 openings

[0041] 6 Inner Ring Wave Channel

[0042] 7 Outer Ring Wave Channel

[0043] 8. Sealing ring Detailed Implementation

[0044] In this invention, unless otherwise stated, directional terms such as "up" and "down" generally refer to positions relative to a horizontal plane. "Up" refers to a position above a reference plane or object, while "down" refers to a position below that reference plane or object. "Left" and "right" generally refer to the side views relative to an observer or a reference object. "Left" refers to the observer's left side, and "right" refers to the observer's right side. "Inner" and "outer" generally refer to spatial relationships relative to a boundary or container. "Inner" refers to the area inside a boundary or container, while "outer" refers to the area outside that boundary or container. "Far" and "near" generally refer to distance relationships relative to a reference object. "Near" refers to a position that is closer to or shorter than the reference object, while "far" refers to a position that is farther from or longer than the reference object.

[0045] Example 1

[0046] This embodiment provides a filter cartridge 100, such as Figures 1-5 As shown, the filter cartridge 100 includes a body 1, and the side of the body 1 is surrounded by wavy pleats 2. The filter cartridge 100 also includes a filter screen 3, with part of the filter screen 3 disposed on the inner wall surface of the pleats 2 and part of the filter screen 3 disposed on the outer wall surface of the pleats 2. Gas is discharged after passing through the filter screen 3 disposed on the inner and outer wall surfaces in sequence or passing through the filter screen 3 disposed on the outer and inner wall surfaces in sequence.

[0047] Through the above technical solution, filter screens 3 are provided on both the inner and outer walls of the pleats 2 of the filter cartridge 100 body 1. Compared with the prior art where filter screens 3 are only provided on the inner or outer walls of the filter cartridge 100, the filter cartridge 100 in this solution forms a dual-channel system. With the same body 1, the filtration area of ​​the filter screen 3 is doubled, improving the filtration efficiency of the filter cartridge 100 and further enhancing the removal efficiency of fine particles and pollutants. Furthermore, by increasing the filtration area and optimizing the gas flow path, the filter cartridge 100 can reduce energy consumption during operation. The reduced flow resistance of gas passing through the filter screen 3 means that under the same airflow, the required energy consumption will also be reduced, thus achieving higher energy efficiency. The inner and outer walls of the pleats 2 of the filter cartridge 100 body 1 are both wavy, with continuous curved surfaces and no obvious corners, effectively optimizing the gas flow distribution and greatly reducing airflow turbulence and dead zones, thereby ensuring that the gas can fully contact the filter screen 3 and improving the overall filtration efficiency. For example, Figures 1-3 As shown, the filter cartridge 100 in this embodiment has both inner and outer channels. Both the channel located inside the filter cartridge 100 and the channel located outside the filter cartridge 100 can filter the gas. The gas can flow from the inside to the outside for filtration, or it can flow from the outside to the inside for filtration. Both the inner and outer channels can adsorb and filter impurities in the gas, which changes the disadvantage of the filter cartridge 100 in the prior art that can only filter the gas through a single channel.

[0048] In a preferred embodiment, the filter cartridge 100 further includes an end cap 4, which is detachably connected to one of the upper and lower ends of the filter cartridge 100. The end cap 4 seals the edge of the corresponding end of the filter cartridge 100. The detachable end cap 4 makes maintenance and replacement of the filter cartridge 100 more convenient. Users can easily remove the end cap 4 to clean or replace the filter screen 3 without disassembling the entire filter cartridge 100, reducing the overall operating cost of the filter cartridge 100. In addition, the end cap 4 seals the edge of the filter cartridge 100, ensuring that no gas leakage occurs when gas passes through the filter cartridge 100, guaranteeing the filtration effect of the filter cartridge 100, and effectively preventing unfiltered gas from being directly discharged.

[0049] In another preferred embodiment, the filter cartridge 100 is a one-piece molded part. A transition section is provided between the upper or lower ends of the pleats 2 on the inner and outer sides of the filter cartridge 100 body 1, allowing for integral connection of its inner and outer walls, resulting in high structural strength. It should be noted that when an end cap 4 is provided, there are two implementation methods: one where the end cap 4 is detachably connected to one of the upper and lower ends of the filter cartridge 100, with an integrally molded transition section at the other end; and another where the end cap 4 is integrally molded to one of the upper and lower ends of the filter cartridge 100, with an integrally molded transition section at the other end.

[0050] Furthermore, the end cap 4 includes an end cap body 41 and a connecting portion 42. A groove 43 is provided on the end cap body 41, and the connecting portion 42 is disposed within the groove 43. The sidewall of the groove 43 conforms to the inner or outer wall surface of the fold 2, so that the sidewall of the groove 43 fits against the inner or outer wall surface of the fold 2. That is, the sidewall of the groove 43 is also wavy. The wavy surface of the fold 2 allows force to be evenly diffused along the tangential direction. The wavy sidewall of the groove 43 is located between the inner and outer wall surfaces of the fold 2 and fits against both the inner and outer wall surfaces. The pressure received by the inner and outer walls is more easily transmitted to the end cap 4 through the side wall of the groove 43. The end cap 4 can effectively support the inner and outer walls. For example, during the dust removal process, a negative pressure is formed between the inner and outer walls. The pressure formed by this negative pressure on the inner and outer walls can be effectively transmitted to the end cap 4 through the side wall of the groove 43, so that the end cap 4 can share the pressure on the inner and outer walls of the pleats 2 of the filter cartridge 100, thus extending its service life. A suction channel is provided between the joint 42 and the end cap body 41. The suction channel facilitates the entry and exit of airflow, which is convenient for further cleaning of the filter cartridge 100. In addition, see Figures 1-4 The upper and lower outer edges of the end cap body 41 are provided with sealing ring grooves 44. The sealing ring grooves 44 are annular grooves. The sealing ring grooves 44 on the upper and lower sides are used to install the sealing rings 8. The filter cartridge 100 can be installed by insertion or by hanging, so that the filter cartridge 100 has good sealing performance when it is installed.

[0051] Furthermore, a vent 421 is provided in the middle of the joint 42; this ensures airflow through the vent 421, enhancing the flushing of dust from the inner ring; in addition, the vent 421 provides extra safety during gas flow. In case of abnormal conditions (such as filter 3 clogging), the vent 421 can help release internal pressure, preventing safety hazards caused by excessive pressure, improving safety during use, and reducing operational risks. Additionally, the middle of the joint 42 can preferably be configured as a microporous channel (not shown in the figure), and the wall thickness of the middle of the joint 42 is relatively thin. Specifically, the thickness of the joint 42 is consistent with the thickness of the inner and / or outer wall surfaces of the folds 2. Under the action of airflow, it vibrates, helping to shake off the dust attached to the joint 42, thereby flushing off dust from the inner ring 360° without dead angles, improving the dust removal effect.

[0052] Furthermore, the upper end and the lower end of the filter cartridge 100 each have an opening 5. If the upper end of the filter cartridge 100 is closed, the lower end of the filter cartridge 100 has an opening 5; if the lower end of the filter cartridge 100 is closed, the upper end of the filter cartridge 100 has an opening 5. The design of the opening 5 facilitates installation into the corresponding filtration device. The opening 5 is designed to allow the gas to make more full contact with the filter screen 3 when passing through the filter cartridge 100. The opening 5 allows the gas to quickly expand within the cavity where the body 1 of the filter cartridge 100 is located, thereby improving the filtration efficiency for fine particulate matter and pollutants.

[0053] Furthermore, a guide shroud is provided above the end cap 4. The guide shroud effectively optimizes the gas flow distribution within the filter cartridge 100. By guiding the gas evenly into the filter cartridge 100, the guide shroud reduces airflow turbulence and dead zones, ensuring sufficient contact between the gas and the filter screen 3, thereby improving overall filtration efficiency. The guide shroud helps enhance the contact time and area between the gas and the filter screen 3, thus improving the removal efficiency of fine particles and contaminants. Guided by the guide shroud, the gas can pass through the filter screen 3 more effectively, ensuring the cleanliness of the emitted gas. In addition, the guide shroud also plays a role in vibration damping and noise reduction. By smoothing the airflow entry, the guide shroud reduces noise and vibration caused by airflow turbulence, improving the operational comfort and stability of the equipment.

[0054] The pleats 2 are evenly distributed on the side of the main body 1. This even distribution helps to make the gas flow more uniformly within the filter cartridge 100. When the gas passes through the pleats 2, it can reduce local turbulence and dead zones, ensuring smooth gas flow, reducing gas flow resistance, and improving overall filtration performance. The evenly distributed pleats 2 can also reduce the energy consumption of the filter cartridge 100 during operation, meaning that the energy required for the same airflow will be reduced, thus achieving higher energy efficiency.

[0055] In this embodiment, the pore diameter of the filter screen 3 ranges from 8 μm to 13 μm. Setting the pore diameter within this range allows for effective filtration of particles of a specific size. This range effectively removes most suspended particles, dust, and other contaminants without causing excessive resistance to gas flow, thus ensuring gas cleanliness. However, the diameter of the filter screen 3 in this embodiment is not limited to this.

[0056] The main body 1 includes several independently separated channels. Preferably, 5-20 independently separated channels can be provided. The channels with multiple internal cavities can be in groups of 6, 10, or 20, etc. Each group of channels has 2 to 4 waves. The outer wave-shaped ripples are large and shallow (10-15mm), and the inner wave-shaped ripples are small and deep (20-35mm). However, the number of channels and groups in this embodiment are not limited to these.

[0057] In a preferred embodiment, see [link to preferred embodiment]. Figure 1 and Figure 2 The suction channel between the joint 42 and the end cap body 41 is provided with an independently divided channel, and the groove 43 is provided with an independently divided inner cavity for the channel, so that the groove 43 forms a sub-groove 431 that matches the multiple independently divided inner cavities. Each individual channel has an individual suction channel, thereby making the gas flow distribution into each individual channel more uniform.

[0058] In a preferred embodiment, the sintering material of the filter cartridge 100 includes one or more of ultra-high molecular weight polyethylene, high-density polyethylene, modified polypropylene, polyphenylene ether, polyphenylene sulfide, polytetrafluoroethylene and polyimide, silica, quartz stone and ceramics.

[0059] The selected materials, such as polytetrafluoroethylene (PTFE) and polyimide (PI), possess excellent chemical stability, resisting the corrosive effects of various chemicals. This allows the filter cartridge 100 to be used in a variety of harsh working environments, ensuring its long-term stability and reliability. Polyimide and certain ceramic materials exhibit good high-temperature resistance, maintaining their physical and chemical properties unchanged under high-temperature conditions. Materials such as ultra-high molecular weight polyethylene (UHMWPE) and high-density polyethylene (HDPE) possess excellent mechanical strength and toughness, capable of withstanding significant pressure and impact. This strength allows the filter cartridge 100 to maintain stable performance under high-load operating conditions, extending its service life. Polymer materials are lighter than traditional metal materials, making the filter cartridge 100 easier to install and maintain. The lightweight design not only reduces transportation costs but also lessens the overall burden on the equipment, improving system flexibility. By combining polymers with inorganic materials (such as silica, quartz, and ceramics), optimized filtration performance can be achieved. The addition of inorganic materials can improve the wear resistance and compressive strength of the filter cartridge 100, while enhancing its ability to filter fine particulate matter and ensuring the cleanliness of the emitted gas.

[0060] Specifically, the use of the filter cartridge 100 in this embodiment is as follows: the polymer filter cartridge 100 is installed in the dust collector. After the dust-laden gas enters the dust collector, whether it enters from the inner ring or the outer ring channel, the dust will be captured by the polymer filter cartridge 100, and the gas will be discharged through the micropores on the inner ring wave channel 6 and the outer ring wave channel 7 of the filter cartridge 100, thereby achieving dust control or media separation.

[0061] The dust removal process of the filter cartridge 100 in this embodiment is as follows: When the filtration resistance gradually increases, compressed air is injected into the channel of the filter cartridge 100 through a pulse solenoid valve, causing the gas inside the filter cartridge 100 to expand and contract rapidly, resulting in impact vibration for dust removal, shaking off the dust in the inner wave channel 6 and the outer wave channel 7. At the same time, a dedicated guide cover is provided above the end cover 4, and a reinforced microporous channel is provided in the center of the end cover 4, which helps to wash and shake off the dust in the inner wave channel 360° without dead angles, thus achieving dust removal.

[0062] It should be noted that, because the pleats 2 in this embodiment are wavy with uniform curvature, the dust is mostly in "point contact" or "line contact," resulting in a small contact area between the dust and its surface. This weakens the dust's adhesion (van der Waals forces, electrostatic forces, etc.), making it easier for external forces (such as airflow or vibration) to remove it. Furthermore, since the pleats 2 have no sharp edges, they do not generate mechanical jamming forces that hinder dust removal, thus effectively reducing the difficulty of dust removal. The wavy surface of the pleats 2 also guides airflow smoothly along the surface, reducing airflow disturbance and eddies, making it less likely for dust to accumulate in large quantities in localized areas (such as corners). During the dust removal process, the airflow can act evenly on the surface, directly impacting the adhered dust. In addition, the elastic deformation of the wavy fold 2 surface in this embodiment is relatively uniform. During vibration cleaning, the stress can be continuously transmitted without obvious "force exhaustion area". It can drive the overall peeling of surface dust. During pulse jet cleaning, the fold 2 surface can allow the impact force to spread evenly along the tangential direction, covering the entire surface, and has excellent cleaning force transmission efficiency. Furthermore, due to the excellent force transmission efficiency, stress concentration is effectively avoided, thus the whole structure has excellent structural strength and ensures a long service life.

[0063] To better demonstrate the technical effect of this embodiment, based on the filter cartridge 100 of the above embodiment, it can be seen that the body side of the cartridge 100 of this application is provided with wavy pleats 2, and the filter screen 3 covers both the inner and outer wall surfaces of the pleats 2, thereby providing 5-20 independent partition channels, with an inner wavy depth of 20-35mm and an outer wavy depth of 10-15mm; while the filter cartridge of the prior art is a single-channel design (only the inner wall or a single side of the outer wall is provided with a filter screen), without independent partition channels. When the counting efficiency was tested at an airflow of 500 m³ / h, the operating resistance of this application was 715.4 Pa, while the operating resistance of the prior art was 850-1100 Pa. This application can achieve a 15%-30% reduction in resistance and lower energy consumption. Under the condition of 500 m³ / h airflow, the interception efficiency of this application for particles of different sizes is ≥98.4% for 5-10 μm and ≥99.8% for particles larger than 10 μm. In contrast, the interception efficiency of the prior art for particles of different sizes is 90-95% for 5-10 μm, 95-98% for 10-15 μm, and 98-99% for 15-20 μm. The interception efficiency of this application for particles of all sizes is higher than that of ordinary filter cartridges, especially for tiny particles larger than 5 μm, the efficiency improvement is significant.

[0064] Example 2

[0065] This embodiment provides a method for manufacturing the filter cartridge 100 as described in Embodiment 1 above, including:

[0066] Step 1: Make a mold for filter cartridge 100, the mold is suitable for forming wavy pleats 2;

[0067] Step 2: Mix the polymer raw materials according to the specified ratio and then pour the mixture into the mold;

[0068] Step 3: Place the mold from Step 2 into a sintering furnace, calcine at high temperature, hold at that temperature, and then cool.

[0069] The filter cartridge 100's body and end cap 4 are formed by a secondary sintering process.

[0070] Furthermore, the sintering calcination temperature is determined based on the material loaded into the mold, and the calcination temperature of the mold is between 215℃ and 370℃.

[0071] Specifically, the mold manufacturing process in step 1 is as follows: A mold made of aluminum alloy is created. The mold consists of two parts. The first part is a multi-cavity cylindrical structure. The mold is circular in shape, with both outer and inner circular shapes. This circular shape can be integral or split (e.g., a two-part structure, with the size selected according to actual needs). The wave pattern of the inner wave channel 6 and the outer wave channel 7 can be adjusted according to the filtration area to meet the actual requirements of the working conditions. The shape and size of the intermediate cavities of the inner and outer wave channels 6 and 7 can be standardized through the design of the inner cavity core pulling. The end of the core pulling has a positioning device to ensure that the thickness of the inner and outer filter bodies is consistent, forming a cylindrical mold for a filter cartridge 100 with multiple independently separated and fixed channels.

[0072] The second part of the mold consists of a bottom end cap 4 and an upper end cap 4. The bottom or top end cap 4 is used to fix the inner and outer ring cylinders and provide stable support during material feeding, and is easy to remove when the mold is opened. The upper end cap 4 is divided into two parts. One part is to cooperate with the bottom end cap 4 to integrate the upper and lower parts into one piece. This end cap 4 needs to have a core-pulling process hole to facilitate the entry and exit of the core during material feeding and mold opening. At the same time, the end cap 4 can be removed after the core pulling is completed, making it easy to remove the filter cartridge 100. The other part is the airflow suction channel end cap 4. The plane of the end cap 4 is distributed with corresponding channels that are independently separated from the inner cavity of the cylinder for airflow suction. There is a process hole in the middle of the end cap 4 to ensure that the airflow passes through the middle process hole to strengthen the flushing of dust in the inner ring.

[0073] After the mold is completed, in the second step of making filter cartridge 100, the polymer raw materials are proportioned (the selected raw materials can be organic materials such as ultra-high molecular weight polyethylene, high-density polyethylene, modified polypropylene, polyphenylene ether, polyphenylene sulfide, polytetrafluoroethylene, and polyimide, or inorganic materials such as silica, quartz, and ceramics). The organic materials are then mixed and poured into the mold. Next, the mold is placed in a sintering furnace for high-temperature calcination (the cartridge body and cover are formed through a secondary sintering process). The calcination temperature is controlled according to the mold... The material to be filled is determined, and can be selected from the range of 215℃ to 370℃ (if one or more of silicon dioxide, quartz stone, and ceramics are filled, a secondary sintering molding process is adopted, and the product after demolding is calcined again, with the second calcination temperature between 800℃ and 950℃) to ensure that the molded product meets the molding standards; after heat preservation and cooling treatment, the mold is removed from the furnace, cooled, and the finished filter cartridge 100 is taken out. The polymer finished filter cartridge 100 has a uniform particle size distribution, and the pores are all at the micron level (see pore size distribution test data). Figure 5 The filter cartridge 100 is then coated, sealed, and inspected to become a finished filter cartridge 100. However, the temperature in this embodiment is not limited to this.

[0074] Through the above technical solution, filter screens 3 are provided on both the inner and outer walls of the pleats 2 of the body 1 of the filter cartridge 100. Compared with the prior art, where filter screens 3 are only provided on the inner or outer walls of the filter cartridge 100, the filter cartridge 100 in this solution forms a dual channel with both inner and outer sides. With the same body 1, the filtration area of ​​the filter screen 3 is doubled, which improves the filtration efficiency of the filter cartridge 100 and reduces the cost of filtration.

[0075] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A filter cartridge, characterized in that, The filter cartridge (100) includes a body (1) and an end cap (4). The side of the body (1) is surrounded by wavy pleats (2). The filter cartridge (100) also includes a filter screen (3). Part of the filter screen (3) is disposed on the inner wall surface of the pleats (2), and part of the filter screen (3) is disposed on the outer wall surface of the pleats (2). Gas passes through the filter screen (3) disposed on the inner wall surface and the outer wall surface in sequence or gas passes through the filter screen (3) disposed on the outer wall surface and the inner wall surface in sequence and then is discharged. The end cap (4) is detachably connected to one of the upper and lower ends of the filter cartridge (100), and the end cap (4) seals the edge of the corresponding end of the filter cartridge (100); The end cap (4) includes an end cap body (41) and a connecting part (42). The end cap body (41) is provided with a groove (43). The connecting part (42) is disposed in the groove (43). The side wall of the groove (43) conforms to the inner wall or outer wall of the fold (2) so as to make the side wall of the groove (43) fit the inner wall or outer wall of the fold (2). A suction channel is provided between the connecting part (42) and the end cap body (41). The body (1) includes several independently separated channels, the suction channel is set in accordance with the independently separated channels, and the groove (43) is set in accordance with the independently separated inner cavity of the channel, so that the groove (43) forms a sub-groove (431) that matches the several independently separated inner cavities.

2. The filter cartridge according to claim 1, characterized in that, A vent hole (421) is provided in the middle of the joint (42); and / or, The filter cartridge (100) has an opening (5) at one of its upper and lower ends.

3. The filter cartridge according to claim 1 or 2, characterized in that, The filter cartridge (100) is an integrally molded part. The body (1) is provided with a filter section between the upper or lower ends of the pleats (2) on the inner and outer sides, so that the inner and outer walls of the pleats (2) can be integrally connected.

4. The filter cartridge according to claim 1 or 2, characterized in that, A guide cover is provided above the end cap (4); and / or, The folds (2) are evenly distributed on the side of the body (1).

5. The filter cartridge according to claim 1 or 2, characterized in that, The pore diameter on the filter screen (3) ranges from 8µm to 13µm; and / or, The main body (1) includes 5-20 independently separated channels.

6. The filter cartridge according to claim 1 or 2, characterized in that, The filter cartridge (100) comprises one or more of the following: ultra-high molecular weight polyethylene, high-density polyethylene, modified polypropylene, polyphenylene ether, polyphenylene sulfide, polytetrafluoroethylene and polyimide, silica, quartz stone and ceramic.

7. A method for manufacturing a filter cartridge as described in any one of claims 1-6, characterized in that, include: Step 1: Make a mold for the filter cartridge (100), the mold being adapted to form the wavy pleats (2). Step 2: Mix the polymer raw materials according to the specified ratio and then pour the mixture into the mold; Step 3: Place the mold from Step 2 into a sintering furnace, calcine at high temperature, hold at that temperature, and then cool.

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