High packing density, high flux pleated filter cartridges

Abstract

The application provides a high filling density large flux folding filter element, which sets the framework structure of the filter element into a coaxial quadrilateral structure while making the folding surface of the folding filter membrane perpendicular to the plane where the adjacent framework structure is located, improves the filling rate of the folding filter membrane between the filter element shell and the filter element center tube, and fully utilizes the internal space of the filter element; in addition, the folding filter membrane set in the above manner is convenient for regulating the number of the folding filter membrane crests, thereby effectively improving the effective filtering area of the folding filter membrane without affecting the water flow resistance, achieving a higher filtering flux, and effectively improving the filtering efficiency. In particular, when the folding filter element is filled in the filter, the distance between the filter elements is effectively reduced, the number of the filter elements arranged in the limited space is increased, and the filtering area of the entire filter is improved.

Description

Technical Field

[0001] This invention relates to the field of filtration and separation technology, and in particular to a high-density, high-flux pleated filter cartridge. Background Technology

[0002] Pleated filter cartridges are manufactured into cylindrical shapes through processes such as pleating filter media (e.g., microporous membranes) using a pleating machine, sealing the filter media edges, fixing the inner core and outer cover, and sealing the end caps. This results in a multi-folded filter cartridge assembly with a high filtration area. Under pressure, the fluid being filtered passes through the surface of the filter membrane. Particulate matter and large molecules are trapped on the surface, forming a filter cake layer. The purified fluid then passes through the filter cake layer and the filter membrane. In this process, the effective filtration area of ​​the filter cartridge is the primary factor affecting filtration efficiency; the larger the area of ​​the filter membrane filled in the pleated filter cartridge, the greater the filtration flux.

[0003] In the prior art, patent application number 201910883891.2, published on December 6, 2019, entitled "A Folded Filter Cartridge," discloses a folded filter cartridge including a central rod, a shell, and a pleated filter membrane located between the two. Each pleat has a pleat valley near the central rod, a pleat peak near the shell, and a first leg and a second leg extending from the pleat valley to the pleat peak. The pleat valley spaced apart from the central rod is the first pleat valley, the pleat valley in contact with the central rod is the second pleat valley, the pleat peak spaced apart from the shell is the first pleat peak, and the pleat peak in contact with the shell is the second pleat peak. The presence of the first pleat valley and the first pleat peak increases the filtration area of ​​the filter cartridge. However, in the above technical solution, the pleated filter membrane is arranged in an arc shape inside the filter element. On the one hand, the presence of the first pleat and the first pleat peak makes it difficult to completely fill the inside of the filter element. There are still spaces that are difficult to fill outside the first pleat and the first pleat peak, which makes it difficult to ensure that the filter membrane is efficiently filled inside the filter element, resulting in insufficient utilization of the internal space of the filter element and insufficient overall effective filtration area of ​​the filter element. On the other hand, the pleated filter membrane with an arc distribution is prone to deformation when subjected to the impact force from the liquid, resulting in a decrease in the effective filtration area of ​​the filter element.

[0004] In view of this, it is necessary to design an improved high-density, high-flux pleated filter cartridge to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a high-flow-rate pleated filter element with high packing density.

[0006] To achieve the above-mentioned objectives, the present invention provides a high-density, high-flux pleated filter element, comprising a filter element shell, a filter element central tube disposed inside the filter element shell, and a filter element upper end cap and a filter element lower end cap respectively disposed at both ends of the filter element shell;

[0007] The filter element shell and the filter element central tube are coaxial quadrilateral structures, and a pleated filter membrane is provided in the area between the filter element shell and the filter element central tube;

[0008] The filter element has a liquid outlet on its upper end cap and an opening on its outer shell for the liquid to be treated to enter the interior of the pleated filter element.

[0009] Preferably, the folded filter membrane has several protruding folds of the same height, the folded surfaces of which are perpendicular to the plane of the adjacent filter element shell, and the distance between two adjacent folded surfaces is equal.

[0010] Preferably, the two adjacent folds are infinitely close to each other, and the height of the fold peak is 0.5-5cm.

[0011] Preferably, the filter element shell and the two opposite sides of the filter element central tube are connected by a connecting part, and the folded filter membrane is disposed between the filter element shell, the filter element central tube and the connecting part.

[0012] Preferably, the ratio of the cross-sectional diameter of the filter element central tube to that of the filter element outer shell is 0.2-0.85.

[0013] Preferably, the folded filter membrane consists of at least one filter membrane layer and flow guiding layers disposed on the upper and lower surfaces of the filter membrane layer.

[0014] Preferably, the two ends of the folded filter membrane near the upper end cap and the lower end cap of the filter element are coplanar with the plane of the end of the filter element central tube.

[0015] Preferably, the filter element outlet is formed by protruding outward from the side of the filter element upper end cover away from the filter element central tube, and the location of the filter element outlet corresponds to the filter element central tube.

[0016] Preferably, the opening is provided on the wall surface of the filter element center tube and the connecting part.

[0017] Preferably, the lower end cap of the filter element is a flat surface that is impermeable to liquid and permeable to air.

[0018] The beneficial effects of this invention are:

[0019] 1. The high-density, high-flux pleated filter cartridge provided by this invention, while setting the filter cartridge skeleton structure as a coaxial quadrilateral structure, also makes the pleated surface of the pleated filter membrane perpendicular to the plane of the adjacent skeleton structure, thereby improving the filling rate of the pleated filter membrane between the filter cartridge shell and the filter cartridge central tube, and making full use of the internal space of the filter cartridge; in addition, the pleated filter membrane set in the above manner is easy to control the number of pleats of the pleated filter membrane, thereby effectively increasing the effective filtration area of ​​the pleated filter membrane without affecting the water flow resistance, and achieving a higher filtration flux while ensuring filtration efficiency.

[0020] 2. The high-density, high-flux pleated filter cartridge provided by this invention, by vertically arranging the pleats of the pleated filter membrane in the area between the filter cartridge shell and the filter cartridge center tube, allows the liquid to flow into the area between adjacent pleats when the liquid to be treated enters the filter cartridge. Since the liquid flow direction is parallel to the pleat setting direction, this not only prevents the pleats from deforming under the liquid flow during use but also reduces the filtration resistance of the pleated filter membrane, facilitating liquid flow and achieving low-energy, low-resistance filtration. Simultaneously, by arranging the pleated filter membrane in the filter cartridge shell and center tube using the method proposed in this invention, the pleats are brought as close as possible to each other, resulting in a high-density arrangement of the filter membrane within the filter cartridge. This effectively utilizes the internal space of the filter cartridge, increasing the overall area of ​​the filter membrane and providing an effective method for high-efficiency filtration. Through the above method, the defects of insufficient filter membrane stability and low effective filtration area in the prior art when the filter membrane is arranged in an arc shape within a circular filter cartridge are effectively solved.

[0021] 3. The high-density, high-flux pleated filter cartridge provided by this invention effectively solves the problem in the prior art where the filter membrane cannot completely fill the interior of the filter cartridge when the filter membrane is arranged in an arc shape, resulting in insufficient utilization of the internal space of the filter cartridge and insufficient overall effective filtration area of ​​the filter cartridge. Secondly, the quadrilateral structure of the filter cartridge effectively reduces the spacing between filter cartridges when filled in the filter, increases the number of filter cartridges in the limited space, and improves the overall filtration area of ​​the filter. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the high-density, high-flux pleated filter element of the present invention;

[0023] Figure 2 This is a disassembled diagram of the high-density, high-flux pleated filter element of the present invention;

[0024] Figure 3 for Figure 1 A cross-sectional view obtained along the direction perpendicular to the center tube of the filter element;

[0025] Figure 4 for Figure 2 A schematic diagram of the filter element's central tube and connecting parts;

[0026] The attached figures are labeled as follows:

[0027] 1. Pleated filter membrane; 2. Filter cartridge housing; 3. Filter cartridge center tube; 4. Filter cartridge upper end cap; 5. Filter cartridge lower end cap. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0030] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Please see Figures 1 to 4 As shown, the high-density, high-flux pleated filter element provided by the present invention includes a filter element shell 2, a filter element central tube 3 disposed inside the filter element shell 2, and a filter element upper end cap 4 and a filter element lower end cap 5 respectively disposed at both ends of the filter element shell 2. The filter element shell 2 and the filter element central tube 3 are coaxial quadrilateral structures, and a pleated filter membrane 1 is provided in the area between the filter element shell 2 and the filter element central tube 3. The side of the filter element upper end cap 4 away from the filter element central tube 3 protrudes outward to form a filter element liquid outlet, and the position of the filter element liquid outlet corresponds to that of the filter element central tube 3. The filter element lower end cap 5 is a liquid-impermeable and air-permeable plane to prevent liquid from flowing into or out of the filter element. Openings are provided on the filter element shell 2, the filter element central tube 3, and the connection part of the filter element shell 2 and the filter element central tube 3. The openings can serve as channels for liquid flow. In this embodiment, the filter element liquid outlet is cylindrical and the opening is quadrilateral. In other embodiments, other shapes can be used, as long as they are set according to actual needs. This is not a limitation.

[0032] Please see Figure 2 and combined Figure 3 and Figure 4As shown, the filter cartridge housing 2 and the filter cartridge central tube 3 are connected by a connecting part (not shown in the figure) on two opposite sides. The ratio of the cross-sectional diameter of the filter cartridge central tube 3 to that of the filter cartridge housing 2 is 0.2-0.85. The area formed by the filter cartridge housing 2, the filter cartridge central tube 3, and the connecting part is filled with a pleated filter membrane 1. Specifically, the filter cartridge housing 2, the filter cartridge central tube 3, and the connecting part form a structure with an isosceles trapezoidal cross-section. The pleated filter membrane 1 is folded and arranged inside the isosceles trapezoid, and its specific arrangement is as follows. Figure 3 As shown, the two ends of the pleated filter membrane 1 are coplanar with the plane of the end of the filter element central tube 3. The pleated filter membrane 1 consists of at least one filter membrane layer and a flow guiding layer disposed on the upper and lower surfaces of the filter membrane layer. Several protruding pleats of uniform height are formed on the pleated filter membrane 1, with equal spacing between adjacent pleats. The folded surface of the pleats is perpendicular to the plane of the adjacent filter element shell 2, and the adjacent folded surfaces are infinitely close to each other. The height of the pleats is 0.5-5cm. Under this condition, it is beneficial to maintain the morphological stability of the pleats during the use of the filter element and avoid deformation due to the impact force of liquid flow, which would affect the effective filtration area of ​​the entire filter element. Through the above arrangement, the area of ​​the pleated filter membrane 1 disposed between the filter element shell 2 and the filter element central tube 3 is increased. Secondly, by making the folded surface of the pleated filter membrane 1 perpendicular to the plane of the adjacent filter element shell 2 and ensuring that the adjacent folded surfaces are infinitely close to each other, efficient filling of the area between the filter element shell 2 and the filter element central tube 3 is achieved. Under the combined effect of the above two functions, the effective filtration area of ​​the filter element is effectively increased, and the filtration throughput of the filter element is improved. It should be noted that, in order to better display the overall details and internal structure of the pleated filter element, [the following text is missing]. Figure 2 and Figure 4 The pleated filter membrane 1 in the text has been omitted, which should be understood by those skilled in the art. Figure 2 and Figure 4 The diagram shown includes a pleated filter membrane 1.

[0033] The working principle of this invention is as follows: When using the high-density, high-flux pleated filter element provided by this invention, the liquid to be treated enters the interior of the filter element through the opening on the pleated filter element, and then enters the area between the pleats of the pleated filter membrane 1. At this time, the liquid to be treated and the pleated filter membrane 1 are in full contact. During the contact process, particulate matter or large molecules in the liquid to be treated are trapped on the surface of the pleated filter membrane 1, while the purified liquid passes through the pleated filter membrane 1 to reach the central tube 3 of the filter element, and is discharged through the outlet of the filter element. In the above process, since the pleats of the pleated filter membrane 1 are vertically arranged in the area between the filter element shell 2 and the central tube 3 of the filter element, when the liquid to be treated enters the pleated filter element, the flow direction of the liquid inside the filter element is parallel to the distribution direction of the pleats. The liquid experiences less filtration resistance from the pleated filter membrane 1. At the same time, the tightly arranged pleats increase the contact area between the liquid and the pleated filter membrane 1, allowing the liquid to fully contact the pleated filter membrane 1 and effectively improving the filtration efficiency. In particular, the quadrilateral structure of the filter element effectively reduces the spacing between the filter elements when filling the filter, increases the number of filter elements in a limited space, and improves the overall filtration area of ​​the filter.

[0034] In summary, the high-density, high-flux pleated filter cartridge provided by this invention, while setting the filter cartridge's skeleton structure as a coaxial quadrilateral structure, ensures that the pleated surfaces of the filter membrane are perpendicular to the planes of adjacent skeleton structures. This increases the filling rate of the pleated filter membrane between the filter cartridge shell and the filter cartridge center tube, fully utilizing the internal space of the filter cartridge. With this configuration, when the liquid to be treated enters the filter cartridge, the liquid flows into the area between adjacent pleats. Since the liquid flow direction is parallel to the pleat direction, the filtration resistance of the pleated filter membrane is reduced, facilitating liquid flow. This effectively increases the effective filtration area of ​​the pleated filter membrane without affecting water flow resistance, achieving higher filtration flux and significantly improving filtration efficiency. Through this method, a high-density, high-flux pleated filter cartridge with a simple structure and high filtration efficiency is provided.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high packing density, high flux pleated filter cartridge, characterized in that, The filter core comprises a filter core shell, a filter core center tube arranged inside the filter core shell, and a filter core upper end cover and a filter core lower end cover arranged at two ends of the filter core shell respectively; the filter core shell and the filter core center tube are coaxial quadrilateral structures, and a folding filter membrane is arranged in a region between the filter core shell and the filter core center tube; a filter core liquid outlet is arranged on the filter core upper end cover, and an opening for allowing a liquid to be treated to enter the inside of the folding filter core is arranged on the filter core shell; the filter core shell and the filter core center tube are connected through a connecting part between two opposite edges of the filter core shell and the filter core center tube, and the folding filter membrane is arranged between the region formed by the filter core shell, the filter core center tube and the connecting part.

2. The high packing density, high flux folded cartridge of claim 1 wherein, A plurality of convex crests with the same height are formed on the folding filter membrane, the folding surface where the crests are located is perpendicular to the plane where the adjacent filter core shell is located, and the distance between two adjacent folding surfaces is equal.

3. The high packing density, high flux folded cartridge of claim 2, wherein, The distance between two adjacent folding surfaces is infinitely close, and the height of the crests is 0.5-5 cm.

4. The high packing density, high flux folded cartridge of claim 1 wherein, The ratio of the cross-sectional diameter of the filter core center tube to the filter core shell is 0.2-0.

85.

5. The high packing density, high flux folded cartridge of claim 1 wherein, The folding filter membrane is composed of at least one filter membrane layer and a flow guide layer arranged on the upper and lower surfaces of the filter membrane layer.

6. The high packing density, high flux folded cartridge of claim 1 wherein, The two ends of the folding filter membrane close to the filter core upper end cover and the filter core lower end cover are coplanar with the plane where the end of the filter core center tube is located.

7. The high packing density, high flux folded cartridge of claim 1 wherein, The filter core liquid outlet is formed by protruding outward from the side of the filter core upper end cover away from the filter core center tube, and the setting position of the filter core liquid outlet corresponds to the filter core center tube.

8. The high packing density, high flux folded cartridge of claim 1 wherein, The wall surface of the filter core center tube and the connecting part is provided with an opening for allowing the purified liquid to pass through.

9. The high fill density, high flux folded cartridge of claim 1 wherein, The filter core lower end cover is a liquid-impermeable and air-permeable plane.

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