A filter of a folding filter element structure

Abstract

The application relates to the technical field of filters, in particular to a filter with a folding filter element structure, which comprises a shell assembly, a folding filter element assembly and a flow channel optimization assembly. The folding filter element assembly is designed with a wavy filter membrane unit and a supporting framework, which increases the filtering area and prolongs the service life. The flow channel optimization assembly uses a flow distribution plate, guide vanes and an adjusting ring to improve fluid distribution and reduce turbulence. The application can significantly improve filtering efficiency and optimize fluid dynamics performance, while having the characteristics of compact structure and easy maintenance, and is suitable for high-flow and small-volume application scenarios, meeting the needs of modern industry for efficient and reliable filtering devices.

Description

Technical Field

[0001] This utility model belongs to the field of filtration equipment technology, specifically a filter with a pleated filter element structure. Background Technology

[0002] With the development of filter technology, various filtration devices are increasingly widely used in industrial, civil, and special environments. However, existing filters still have many shortcomings in terms of structural design, filtration efficiency, and ease of maintenance. In particular, in terms of increasing the effective filtration area per unit volume, traditional filter elements mostly adopt cylindrical or flat plate structures, making it difficult to achieve high-throughput and high-precision filtration within a limited space. Therefore, developing a filter element structure with higher filtration area utilization, a compact structure, and ease of maintenance has become an urgent need for current technological development.

[0003] A search revealed a candle filter with publication number CN111744246B, published on November 29, 2024. This patent discloses a candle filter comprising a housing, end caps, and multiple filter elements vertically arranged within the housing cavity. Each filter element includes a filter screen section and a flange, which is sealed by pressing a pressure plate onto the end cap. While this structure allows for multiple filter elements to be arranged within a single filtration chamber, improving overall filtration capacity, it uses straight-tube filter elements, resulting in a limited filtration area per unit volume. Furthermore, increasing the number of filter elements leads to more complex assembly, more sealing points, and a higher risk of leakage. In addition, this structure does not optimize the filter element structure itself, failing to fundamentally improve the filtration efficiency of individual filter elements and making it difficult to meet the performance requirements of high-flow, small-volume applications.

[0004] A search revealed a virus filter with publication number CN114558454B, published on May 2, 2023. This patent relates to a virus filter whose support plate has a floating plate-like structure within the area enclosed by an annular sealing portion. This allows the filter membrane to bend under pressure differential, thereby reducing filtrate flow resistance and protecting the membrane. While this design is innovative in improving the stress state of the filter membrane and enhancing filtration stability and rate, its core remains based on a planar or slightly wavy filter membrane structure, without employing a pleated filter element design, thus limiting the increase in effective filtration area. Furthermore, this structure requires high precision in membrane support, involves complex manufacturing processes, and is unsuitable for high-flow-rate liquid filtration scenarios.

[0005] The aforementioned issues indicate that existing filter technologies still have significant shortcomings in increasing filtration area, optimizing hydrodynamic performance, and achieving structural compactness. Traditional straight-tube or multi-tube parallel filter cartridges struggle to significantly increase filtration throughput within a limited space; while improvements have been made in controlling membrane deformation, there is a lack of fundamental innovation in the filter cartridge's structure. Therefore, a new filter cartridge structure is urgently needed that can significantly increase the effective filtration area without increasing the overall volume, while also possessing good sealing performance and flow channel distribution characteristics.

[0006] Therefore, this utility model provides a filter with a pleated filter element structure. By adopting a pleated filter membrane assembly to form a continuous undulating flow channel structure, the filtration area per unit volume is significantly increased, thereby improving filtration efficiency and throughput. At the same time, with the optimized end cap sealing and support structure, the stability and reliability under long-term operation are ensured, so as to overcome the defects of existing technologies such as small filtration area, low space utilization and limited throughput, and meet the needs of modern industry for efficient and compact filtration devices. Utility Model Content

[0007] This utility model relates to a filter with a pleated filter element structure, including a housing assembly, a pleated filter element assembly, and a flow channel optimization assembly. The pleated filter element assembly is installed inside the housing assembly, and the flow channel optimization assembly is disposed on the top of the housing assembly to improve fluid distribution and flow characteristics.

[0008] The pleated filter element assembly includes a pleated filter membrane unit, a support frame, a positioning ring, and a sealing ring. The pleated filter membrane unit is formed by multiple layers of corrugated filter membrane sheets arranged alternately circumferentially, with adjacent membrane sheets connected by a heat-fusion bonding process to form a continuously undulating flow channel structure. The support frame extends through the central axis of the pleated filter membrane unit, and its outer wall has multiple radially extending reinforcing ribs that fit tightly against the inner wall of the pleated filter membrane unit to provide additional mechanical strength. The positioning ring is fixedly installed at both the upper and lower ends of the pleated filter membrane unit to limit axial displacement. The sealing ring is nested outside the positioning ring and is interference-fitted with the inner wall of the housing assembly to achieve a sealed connection between the filter element assembly and the housing.

[0009] The flow channel optimization component includes a flow divider plate, guide vanes, and an adjusting ring. The flow divider plate is horizontally mounted on the top inner wall of the housing assembly. A through hole is formed at the center of the flow divider plate, and an annular boss is formed at the edge of the through hole. The outer wall of the annular boss is threadedly connected to the inner wall of the housing assembly. Multiple sets of guide vanes are evenly distributed on the lower surface of the flow divider plate. Each set of guide vanes is arranged in a spiral pattern, with the outer ends of the guide vanes welded to the inner wall of the housing assembly, and the inner ends of the guide vanes extending to the edge of the through hole. The adjusting ring is fitted onto the outside of the flow divider plate. Multiple slots are formed on the inner wall of the adjusting ring, matching the outer ends of the guide vanes. Rotating the adjusting ring changes the tilt angle of the guide vanes, thereby adjusting the flow direction and velocity distribution of the fluid entering the housing assembly.

[0010] The housing assembly includes an outer shell, end caps, and a base. The outer shell is a cylindrical structure with flanges at its top and bottom, and bolt holes on the flanges for connection to the end caps and base. The end cap has a liquid inlet at its center, with internal threads machined on its inner wall for connection to external pipes. The base has a drain outlet at its bottom, with external threads on its outer wall and equipped with a manual valve for controlling liquid discharge. A sealing gasket is used to seal the end caps and outer shell. The gasket is made of corrosion-resistant rubber material with a thickness of 3mm to 5mm to meet sealing requirements under different operating conditions. The adjusting ring can change the tilt angle of the guide vanes by rotation, with the tilt angle ranging from 0 to 60 degrees. The reinforcing ribs on the support frame are evenly distributed radially, with four to eight ribs in total. The spiral arrangement angle of the guide vanes is between 30 and 60 degrees. The weld points that fix the outer ends of the guide vanes to the inner wall of the housing assembly are evenly spaced. The external thread of the drain port is a standard pipe thread. The opening direction of the manual valve is consistent with the liquid flow direction. The assembly method of the folded filter element assembly and the housing assembly is as follows: First, the folded filter membrane unit is fitted onto the support frame, ensuring that the reinforcing ribs are completely fitted with the inner wall of the filter membrane unit; then, the positioning ring is fixed at the upper and lower ends of the folded filter membrane unit, and a sealing ring is installed on the outside; finally, the assembled folded filter element assembly is inserted into the housing, and fixed by the interference fit between the sealing ring and the inner wall of the housing.

[0011] The assembly method of the flow channel optimization component and the housing component is as follows: tighten the annular boss of the flow divider plate to the internal thread on the top of the housing to ensure that the flow divider plate is installed horizontally; then weld and fix the guide vanes one by one to the lower surface of the flow divider plate, and check whether the arrangement of the guide vanes is uniform; finally, put the adjusting ring on the outside of the flow divider plate, and adjust the tilt angle of the guide vanes by rotating the adjusting ring until the design requirements are met.

[0012] This invention significantly increases the effective filtration area per unit volume by employing a folded filter membrane unit to form a continuously undulating flow channel structure, thus solving the problem of low filtration area utilization in traditional filter cartridges. The wave-shaped design of the folded filter membrane unit ensures uniform fluid distribution as it passes through the membrane, preventing excessive local flow and reducing the risk of clogging on the membrane surface. The reinforcing ribs on the support frame not only improve the overall rigidity of the filter cartridge but also provide uniform support for the filter membrane unit, extending the filter cartridge's service life.

[0013] The optimized flow channel design further enhances filter performance. The combination of the flow divider and guide vanes guides the fluid into the housing assembly in a spiral pattern, improving fluid distribution uniformity and reducing turbulence. The introduction of the regulating ring allows for adjustment of the guide vane angle according to actual operating conditions, providing greater flexibility and adaptability. Furthermore, the sealing gasket design between the end cap and the housing, along with the sealing ring structure of the pleated filter element assembly, constitutes a multi-layered sealing system, reducing leakage risk and improving equipment reliability.

[0014] This invention features a compact structure, facilitating maintenance and replacement. The folded filter element assembly allows for quick assembly and disassembly via the positioning ring and sealing ring, eliminating the need for complex tools or procedures. The modular design of the flow channel optimization assembly also makes it easy to replace or repair individual components, reducing maintenance costs. The overall design balances the needs of high-efficiency filtration, optimized fluid dynamics, and a compact structure, making it suitable for high-flow, small-volume applications and meeting the requirements of modern industry for efficient and compact filtration devices. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 2 This is a schematic diagram of the drain outlet structure; Figure 3 This is a schematic diagram of the structure of a pleated filter element assembly. Figure 4 This is a schematic diagram of the flow channel optimization component.

[0016] The attached diagram is labeled as follows: 1. Housing assembly; 2. Folded filter element assembly; 3. Flow channel optimization assembly; 4. Folded filter membrane unit; 5. Support frame; 6. Positioning ring; 7. Sealing ring; 8. Diverter plate; 9. Guide vane; 10. Adjusting ring; 11. Outer shell; 12. End cap; 13. Base; 14. Reinforcing rib; 15. Drain port; 16. Inlet port. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] Specific implementation examples are given below.

[0019] This utility model provides a filter with a folded filter element structure, and its specific implementation is described in detail with reference to the accompanying drawings. Figure 1 As shown, the overall structure includes a housing assembly 1, a pleated filter element assembly 2, and a flow channel optimization assembly 3. The housing assembly 1 serves as the main frame, with the pleated filter element assembly 2 installed inside and the flow channel optimization assembly 3 located on top. All components are precisely designed to achieve a tight fit.

[0020] The housing assembly 1 consists of an outer shell 11, an end cap 12, and a base 13. The outer shell 11 is a cylindrical structure with flanges at its top and bottom, each with bolt holes for connection to the end cap 12 and base 13. The end cap 12 has a liquid inlet 16 at its center, with internal threads machined into its inner wall for connection to external pipes. The base 13 has a drain port 15 at its bottom, with external threads on its outer wall and equipped with a manual valve to control liquid discharge. The end cap 12 and the outer shell 11 are sealed together using a gasket made of corrosion-resistant rubber material with a thickness of 3mm to 5mm. Figure 4 As shown, this assembly relationship ensures the overall sealing of housing assembly 1.

[0021] The pleated filter element assembly 2 includes a pleated filter membrane unit 4, a support frame 5, a positioning ring 6, and a sealing ring 7. The pleated filter membrane unit 4 is formed by multiple layers of corrugated filter membrane sheets arranged alternately circumferentially. Adjacent filter membrane sheets are connected by a heat-fusion bonding process to form a continuous undulating flow channel structure. The support frame 5 runs through the central axis of the pleated filter membrane unit 4, and its outer wall has multiple radially extending reinforcing ribs 14. The reinforcing ribs 14 are tightly fitted to the inner wall of the pleated filter membrane unit 4, providing additional mechanical strength and uniformly supporting the filter membrane unit. The positioning ring 6 is fixedly installed at both the upper and lower ends of the pleated filter membrane unit 4 to limit the axial displacement of the filter membrane unit. The sealing ring 7 is nested outside the positioning ring 6 and is interference-fitted with the inner wall of the housing assembly 1. The interference fit of the sealing ring 7 achieves a sealed connection between the filter element assembly and the housing.

[0022] The assembly process of the pleated filter element assembly 2 is as follows: First, the pleated filter membrane unit 4 is fitted onto the support frame 5, ensuring that the reinforcing ribs 14 are completely flush with the inner wall of the filter membrane unit; then, the positioning rings 6 are fixed to the upper and lower ends of the pleated filter membrane unit 4, and the sealing rings 7 are installed on the outer side; finally, the assembled pleated filter element assembly 2 is inserted into the outer shell 11, and fixed by the interference fit between the sealing rings 7 and the inner wall of the outer shell 11. This assembly method ensures the stability and sealing of the filter element assembly within the shell.

[0023] The flow channel optimization component 3 includes a flow divider plate 8, guide vanes 9, and an adjusting ring 10. The flow divider plate 8 is horizontally mounted on the top inner wall of the outer casing 11. A through hole is formed at the center of the flow divider plate 8, and an annular boss is provided at the edge of the through hole. The outer wall of the annular boss is threadedly connected to the inner wall of the outer casing 11. Multiple sets of guide vanes 9 are evenly distributed on the lower surface of the flow divider plate 8. Each set of guide vanes 9 is arranged in a spiral pattern. The outer ends of the guide vanes 9 are welded and fixed to the inner wall of the outer casing 11, and the inner ends of the guide vanes 9 extend to the edge of the through hole. The adjusting ring 10 is fitted onto the outside of the flow divider plate 8. The inner wall of the adjusting ring 10 has multiple slots that match the outer ends of the guide vanes 9. By rotating the adjusting ring 10, the tilt angle of the guide vanes 9 can be changed, thereby adjusting the flow direction and velocity distribution of the fluid entering the casing component 1. Figure 3 As shown, the design of the flow channel optimization component 3 enables the fluid to enter the housing component 1 in a spiral shape, improving the uniformity of fluid distribution and reducing the occurrence of turbulence.

[0024] The assembly process of the flow channel optimization component 3 is as follows: First, the annular boss of the flow divider plate 8 is screwed tightly to the internal thread on the top of the outer shell 11 to ensure that the flow divider plate 8 is installed horizontally; then, the guide vanes 9 are welded and fixed one by one to the lower surface of the flow divider plate 8, and the uniformity of the arrangement of the guide vanes 9 is checked; finally, the adjusting ring 10 is fitted on the outside of the flow divider plate 8, and the tilt angle of the guide vanes 9 is adjusted by rotating the adjusting ring 10 until the design requirements are met. This assembly method ensures the modular design of the flow channel optimization component 3, which is convenient for individual replacement or maintenance. The tilt angle of the guide vanes 9 can be changed by rotating the adjusting ring 10. The tilt angle ranges from zero to sixty degrees. The reinforcing ribs 14 on the support frame 5 are evenly distributed radially, and the number of reinforcing ribs 14 is four to eight. The spiral arrangement angle of the guide vanes 9 is thirty to sixty degrees. The weld points of the guide vanes 9 and the inner wall of the shell component 1 are evenly distributed. The external thread of the drain port 15 is a standard pipe thread. The opening direction of the manual valve is consistent with the liquid flow direction.

[0025] The working principle of this invention is as follows: Fluid enters the housing assembly 1 through the inlet 16 of the end cap 12. Under the action of the flow channel optimization component 3, the fluid is guided by the flow divider 8 and the guide vanes 9 to enter the housing assembly 1 in a spiral shape. The fluid flows along the outer wall of the pleated filter element assembly 2 inside the housing assembly 1 and is filtered through the continuous undulating flow channel structure of the pleated filter membrane unit 4. The wave-shaped design of the pleated filter membrane unit 4 allows the fluid to be evenly distributed when passing through the filter membrane, avoiding excessive local flow and reducing the risk of clogging on the filter membrane surface. The filtered liquid is discharged from the drain port 15 of the base 13, while impurities are trapped on the surface of the pleated filter membrane unit 4.

[0026] In practical applications, such as Figure 1 As shown, this invention is suitable for applications requiring high flow rates and small volume, such as industrial wastewater treatment, food and beverage processing, and pharmaceutical manufacturing. Users can adjust the tilt angle of the guide vanes 9 by rotating the adjusting ring 10 according to actual operating conditions, thereby optimizing the flow direction and velocity distribution of the fluid. Furthermore, the folded filter element assembly 2 can be quickly assembled and disassembled through the cooperation of the positioning ring 6 and the sealing ring 7, requiring no complex tools or operating procedures, thus reducing maintenance costs.

[0027] This invention features a compact structure, facilitating maintenance and replacement. The folded filter element assembly 2 can be quickly assembled and disassembled via the cooperation of the positioning ring 6 and the sealing ring 7, requiring no complex tools or operating procedures. The modular design of the flow channel optimization assembly 3 also makes it easy to replace or repair individual components, reducing maintenance costs. The overall design takes into account the needs of high-efficiency filtration, fluid dynamics optimization, and structural compactness, meeting the requirements of modern industry for high-efficiency, compact filtration devices. To better enable those skilled in the art to fully understand and implement this invention, the specific implementation principle of this invention is further explained below in conjunction with a specific application scenario.

[0028] In industrial wastewater treatment scenarios, the filter of this invention is first connected to an external pipeline through the inlet 16 on the end cap 12 to ensure that fluid can smoothly enter the housing assembly 1. The operator needs to check whether the sealing gasket is installed correctly and confirm that its thickness meets design requirements to ensure a tight seal between the end cap 12 and the housing 11. Subsequently, the manual valve on the base 13 is closed to prevent premature liquid discharge.

[0029] When fluid enters the housing assembly 1 through the inlet 16, it first contacts the flow divider 8. The annular boss of the flow divider 8 is threadedly connected to the inner wall of the top of the housing 11, ensuring that the flow divider 8 is installed horizontally and in a fixed position. When the fluid passes through the central through-hole of the flow divider 8, it is guided by the guide vanes 9, forming a spiral flow. The tilt angle of the guide vanes 9 can be adjusted by rotating the adjusting ring 10. The operator can select a suitable tilt angle according to the actual working conditions to optimize the flow direction and velocity distribution of the fluid. For example, under high flow conditions, the tilt angle of the guide vanes 9 can be appropriately increased to reduce the impact force when the fluid enters the housing assembly 1 and reduce the probability of turbulence.

[0030] As the fluid enters the housing assembly 1 along a spiral path, it begins to flow around the outer wall of the pleated filter element assembly 2. The pleated filter membrane unit 4 is formed by alternating layers of corrugated filter membrane sheets, which are connected by a heat-fusion bonding process to form a continuously undulating flow channel structure. This corrugated design allows the fluid to be evenly distributed as it passes through the filter membrane, avoiding the problem of excessive flow in local areas. The support frame 5 runs through the central axis of the pleated filter membrane unit 4, and the reinforcing ribs 14 on its outer wall are tightly fitted to the inner wall of the filter membrane unit. This not only provides additional mechanical strength to the filter membrane unit but also evenly distributes the pressure of the fluid on the filter membrane, reducing the risk of filter membrane surface clogging.

[0031] During the filtration process, impurities in the fluid are trapped on the surface of the pleated filter membrane unit 4, while the filtered liquid continues to flow downwards along the inner wall of the housing assembly 1 and is finally discharged through the drain port 15 on the base 13. The operator can control the speed and flow rate of the liquid discharge by opening the manual valve, and at the same time observe the liquid status at the drain port 15 periodically to determine whether the filtration effect has met expectations.

[0032] When maintenance or replacement of the pleated filter element assembly 2 is required, the operator only needs to remove the end cap 12 and take out the pleated filter element assembly 2. Since the pleated filter element assembly 2 is interference-fitted with the inner wall of the housing assembly 1 via the positioning ring 6 and the sealing ring 7, disassembly and assembly can be completed quickly without the need for complex tools. Furthermore, the modular design of the flow channel optimization assembly 3 also makes it easy to replace or repair individual components. For example, if the guide vane 9 is damaged, the adjusting ring 10 can be directly removed and the damaged part replaced without disassembling the entire filter.

[0033] As can be seen from the above steps, this invention significantly increases the effective filtration area per unit volume through the wave-shaped design of the folded filter membrane unit 4, solving the problem of low filtration area utilization in traditional filter cartridges. Simultaneously, the design of the flow channel optimization component 3 improves the uniformity of fluid distribution, reduces turbulence, and further enhances filtration efficiency. The overall structure is compact, facilitating maintenance and replacement, and meeting the demands of modern industry for efficient and compact filtration devices.

[0034] All content not described in detail in this specification is prior art known to those skilled in the art, and the model parameters of each component are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are not shown in the figures because they are prior art, and will not be described further here.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A filter with a pleated filter element structure, characterized in that, It includes a housing assembly (1), a pleated filter element assembly (2) and a flow channel optimization assembly (3), wherein the pleated filter element assembly (2) is installed inside the housing assembly (1) and the flow channel optimization assembly (3) is provided on the top of the housing assembly (1).

2. The filter with a pleated filter element structure according to claim 1, characterized in that, The folded filter element assembly (2) includes a folded filter membrane unit (4), a support frame (5), a positioning ring (6), and a sealing ring (7). The folded filter membrane unit (4) is formed by multiple layers of corrugated filter membrane sheets arranged alternately in the circumferential direction. Adjacent filter membrane sheets are connected by a hot-melt bonding process. The support frame (5) passes through the central axis of the folded filter membrane unit (4), and multiple radially extending reinforcing ribs (14) are provided on the outer wall of the support frame (5). The reinforcing ribs (14) are tightly fitted with the inner wall of the folded filter membrane unit (4). The positioning ring (6) is fixedly installed at the upper and lower ends of the folded filter membrane unit (4). The sealing ring (7) is nested on the outside of the positioning ring (6) and is interference-fitted with the inner wall of the housing assembly (1).

3. The filter with a pleated filter element structure according to claim 1, characterized in that, The flow channel optimization component (3) includes a flow divider plate (8), a flow guide vane (9), and an adjustment ring (10). The flow divider plate (8) is horizontally installed on the top inner wall of the housing component (1). A through hole is provided in the center of the flow divider plate (8), and an annular boss is provided on the edge of the through hole. The outer wall of the annular boss is threadedly connected to the inner wall of the housing component (1). Multiple sets of flow guide vanes (9) are evenly distributed on the lower surface of the flow divider plate (8). Each set of flow guide vanes (9) is arranged in a spiral shape. The outer end of the flow guide vane (9) is welded and fixed to the inner wall of the housing component (1). The inner end of the flow guide vane (9) extends to the edge of the through hole. The adjustment ring (10) is fitted on the outer side of the flow divider plate (8). Multiple slots are provided on the inner wall of the adjustment ring (10). The slots match the outer ends of the flow guide vanes (9).

4. The filter with a pleated filter element structure according to claim 1, characterized in that, The housing assembly (1) includes an outer shell (11), an end cap (12), and a base (13). The outer shell (11) is a cylindrical structure with flanges at its top and bottom. Bolt holes are provided on the flanges for connection with the end cap (12) and the base (13). The end cap (12) has a liquid inlet (16) at its center. The inner wall of the liquid inlet (16) is machined with internal threads. The bottom of the base (13) has a drain port (15). The outer wall of the drain port (15) is provided with external threads and equipped with a manual valve.

5. A filter with a pleated filter element structure according to claim 2, characterized in that, The wavy filter membranes of the folded filter membrane unit (4) are arranged alternately in the circumferential direction to form a continuous undulating flow channel structure, and the hot-melt bonding process connection points between adjacent filter membranes are evenly distributed.

6. A filter with a pleated filter element structure according to claim 3, characterized in that, The adjustment ring (10) can change the tilt angle of the guide vane (9) by rotating it, and the tilt angle ranges from zero to sixty degrees.

7. A filter with a pleated filter element structure according to claim 4, characterized in that, The end cap (12) and the outer shell (11) are sealed together by a gasket. The gasket is made of corrosion-resistant rubber material and has a thickness of three to five millimeters.

8. A filter with a pleated filter element structure according to claim 2, characterized in that, The reinforcing ribs (14) on the support frame (5) are evenly distributed radially, and the number of reinforcing ribs (14) is four to eight.

9. A filter with a pleated filter element structure according to claim 3, characterized in that, The spiral arrangement angle of the guide vanes (9) is between 30 and 60 degrees, and the weld points of the guide vanes (9) and the inner wall of the housing assembly (1) are evenly distributed.

10. A filter with a pleated filter element structure according to claim 4, characterized in that, The external thread of the drain port (15) is a standard pipe thread, and the opening direction of the manual valve is consistent with the liquid flow direction.

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