A folding filter cartridge and filter

Abstract

The utility model relates to filter structure technical field discloses a kind of folding filter core and filter, folding filter core includes shell, center pole, filter medium layer, end cap and barrier structure;Shell and center pole coaxial arrangement;Filter medium layer is set between shell and center pole, filter medium layer is annular folded shape, the two ends of the leg of filter medium layer are connected adjacent fold peak and fold valley respectively, fold peak and shell abut, fold valley and center pole abut;Two end caps are respectively set in the two ends of filter medium layer;Barrier structure is set in at least one end of filter medium layer, and barrier structure includes outer barrier ring, and outer barrier ring is respectively bonded with several fold peaks.The utility model utilizes the outer barrier ring in barrier structure to form sealing boundary, avoid fluid to the bending place of filter medium layer directly impact, reduce the deformation or abrasion of bending place under fluid scouring, prolong filter core service life;And reduce the impact force of fluid to the connection between filter medium layer and end, improve sealing performance.

Description

Technical Field

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

[0002] A pleated filter cartridge is a common type of filter element. Its core feature is that sheet-like filter media (such as filter membranes, support mesh, etc.) are processed into a ring or cylindrical structure through a "pleating" process, and then assembled with components such as a shell, central rod, and end caps.

[0003] In related technologies, pleated filter cartridges are formed by pleating the filter media layer to create a highly uniform circular structure. The filter membrane material at the pleats and troughs is at the greatest risk to its performance due to bending. All the pleats and troughs are in direct contact with the outer shell and the central rod, respectively. Under the force of liquid flow, these locations are at greater risk of deformation and breakage, and the integrity of the filter cartridge cannot be guaranteed, resulting in a shorter service life. Utility Model Content

[0004] In view of this, the present invention provides a pleated filter element and filter to solve the problems of high risk of filter membrane breakage at bending points and low filter element service life of existing pleated filter elements.

[0005] In a first aspect, this utility model provides a folded filter element, comprising a shell, a central rod, a filter media layer, end caps, and a barrier structure; the shell has a first perforation; the central rod is disposed inside the shell, the shell and the central rod are coaxially arranged, and the central rod has a second perforation; the filter media layer is disposed between the shell and the central rod, the filter media layer is annularly folded, the filter media layer has a plurality of peaks, a plurality of valleys, and a plurality of legs, the two ends of the legs are respectively connected to adjacent peaks and valleys, the peaks abut against the shell, and the valleys abut against the central rod; two end caps are provided, the two end caps are respectively disposed at both ends of the filter media layer; along the axial direction of the folded filter element, the barrier structure is disposed at at least one end of the filter media layer, the barrier structure includes an outer barrier ring, the outer barrier ring is annular, and the outer barrier ring is respectively bonded to a plurality of peaks.

[0006] Beneficial effects: By setting up a barrier structure, the outer barrier ring in the barrier structure forms the overall sealed boundary of the pleated filter element, avoiding direct impact of fluid on the bends of the filter media layer, reducing deformation or wear at the bends under fluid scouring, and extending the service life of the filter element; furthermore, the outer barrier ring reduces the impact force of fluid on the connection between the filter media layer and the end cap. At the same time, the pleats of the filter media are connected to the outer barrier ring in the axial direction, and the outer barrier ring has a certain height. During the filtration process, the impact force of the liquid on the filter media layer will be preferentially transmitted to the connection between the pleats and the outer barrier ring, rather than the connection between the filter media layer and the end cap, thus improving the sealing performance between the filter media layer and the end cap.

[0007] In one alternative implementation, the outer barrier ring maintains a consistent height in all directions along the circumference of the folded filter element.

[0008] Beneficial effects: The consistent height of the outer barrier ring in all directions allows for minor deviations during manufacturing and assembly that do not affect the structural strength. This improves the structural strength of the outer barrier ring and prevents large local height differences in the outer barrier ring from puncturing the filter media layer and affecting the overall service life of the pleated filter element during filtration.

[0009] In one optional embodiment, the barrier structure further includes a spacer portion connected to the outer barrier ring, the spacer portion being disposed between the end cap and the end of the filter media layer, and bonded to the end of the filter media layer.

[0010] Beneficial effects: By setting the spacer, the spacer provides further support and sealing for the filter media layer. When the filter media layer is subjected to fluid pressure, the spacer can evenly distribute the pressure to the entire filter media layer, ensuring the sealing effect at the end of the filter media layer and preventing the liquid from leaking from the end of the filter media layer.

[0011] In one optional embodiment, the barrier structure further includes an inner barrier ring connected to the spacer portion. The inner barrier ring is annular and is bonded to a plurality of the folds.

[0012] Beneficial effects: By setting an inner barrier ring, the direct impact of fluid on the bends of the filter media layer is further avoided, reducing the deformation or wear of the bends under fluid scouring and extending the service life of the filter element; at the same time, the overall structural strength of the barrier structure is improved.

[0013] In one alternative implementation, the inner barrier ring maintains a consistent height in all directions along the circumference of the folded filter element.

[0014] Beneficial effects: The consistent height of the inner barrier ring in all directions allows for minor deviations during manufacturing and assembly that do not affect the structural strength, thus improving the structural strength of the inner barrier ring and preventing it from puncturing the filter media layer during filtration, further ensuring the overall service life of the pleated filter element.

[0015] In one optional embodiment, along the axial direction of the folded filter element, the height of the outer barrier ring is H1, and the height of the inner barrier ring is H2, satisfying |H1-H2|≤2mm.

[0016] Beneficial effects: By controlling the height difference between the outer barrier ring and the inner barrier ring to not exceed 2mm, it ensures that the two provide balanced support and protection for the filter media layer, avoids stress concentration on one side of the filter media layer due to excessive height difference, prevents the filter media layer from tilting and deforming under fluid pressure, and thus extends the service life of the pleated filter element.

[0017] In one alternative embodiment, the inner barrier ring has a groove, and the end of the central rod is embedded in the groove.

[0018] Beneficial effects: By creating grooves on the inner barrier ring, it is easier to install the overall structure and central rod after the inner barrier ring and filter media layer are assembled, and it can also play a role in fixing the overall barrier structure.

[0019] In one alternative embodiment, the filter media layer includes a filter membrane, and the filter membrane is provided with at least one layer.

[0020] In one optional embodiment, the barrier structure is formed by curing with an adhesive, the adhesive being an isocyanate compound, and the barrier structure has a Shore hardness of HA, satisfying 50≤HA≤95.

[0021] Beneficial effects: By controlling the Shore hardness of the barrier structure, the overall strength and bonding strength of the adhesive and the filter membrane are ensured, while the adhesive has a certain degree of elasticity, preventing the filter membrane from being punctured after the adhesive cures.

[0022] Secondly, this utility model also provides a filter, including the aforementioned pleated filter element. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1This is a cross-sectional view of the filter according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the filter media layer in an embodiment of the present invention. Figure 3 This is a partially enlarged cross-sectional view of the filter media layer in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures: 10. Outer shell; 20. Central rod; 30. Filter media layer; 31. Bending peak; 32. Bending valley; 33. Leg; 40. End cap; 50. Barrier structure; 51. Outer barrier ring; 52. Spacer; 53. Inner barrier ring; 531. Groove; 60. Shell. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0028] According to an embodiment of the present invention, in a first aspect, a folded filter element is provided, comprising a shell 10, a central rod 20, a filter media layer 30, an end cap 40, and a barrier structure 50; the shell 10 has a first perforation; the central rod 20 is disposed inside the shell 10, the shell 10 and the central rod 20 are coaxially arranged, and the central rod 20 has a second perforation; the filter media layer 30 is disposed between the shell 10 and the central rod 20, the filter media layer 30 is annularly folded, and the filter media layer 30 has a plurality of fold peaks 31, a plurality of fold valleys 32, and a plurality of legs 3... 3. The two ends of the leg 33 are respectively connected to adjacent fold peaks 31 and fold valleys 32. The fold peaks 31 abut against the outer shell 10, and the fold valleys 32 abut against the central rod 20. Two end caps 40 are provided. The two end caps 40 are respectively provided at both ends of the filter medium layer 30 and are simultaneously connected to the filter medium layer 30, the central rod 20 and the outer shell 10. Along the axial direction of the folded filter element, a barrier structure 50 is provided at at least one end of the filter medium layer 30. The barrier structure 50 includes an outer barrier ring 51. The outer barrier ring 51 is annular and is bonded to several fold peaks 31 respectively.

[0029] By using the pleated filter element of this embodiment, a barrier structure 50 is set up, and the outer barrier ring 51 in the barrier structure 50 forms the overall sealing boundary of the pleated filter element. This avoids the fluid directly impacting the bends of the filter media layer 30, reduces the deformation or wear of the bends under fluid scouring, and extends the service life of the filter element. Furthermore, the outer barrier ring 51 reduces the impact force of the fluid on the connection between the filter media layer 30 and the end cap. At the same time, the pleats 31 of the filter media layer 30 are connected to the outer barrier ring 51 in the axial direction. The outer barrier ring 51 has a certain height, so the impact force of the liquid on the filter media layer 30 during filtration will be preferentially transmitted to the connection between the pleats 31 and the outer barrier ring 51, rather than the connection between the filter media layer 30 and the end cap 40, thereby improving the sealing performance between the filter media layer 30 and the end cap 40.

[0030] Specifically, in this embodiment, such as Figure 2 As shown, along the axial direction of the pleated filter element, the barrier structure 50 is disposed at both ends of the filter media layer 30.

[0031] It should be noted that for pleated filter cartridges, the outer side of the pleated filter cartridge is generally used as the liquid inlet side, and the end of the filter media layer 30 is sealed to the end cap 40 by direct welding or bonding. During integrity testing, leakage is likely to occur at the end of the filter media. Therefore, an outer barrier ring 51 is set to prevent the liquid from directly impacting the connection between the filter media and the end cap 40.

[0032] It should be noted that the first perforation of the outer casing 10 and the second perforation of the center rod 20 are used for the passage of the feed liquid.

[0033] In this embodiment, as Figure 2 and Figure 3 As shown, the barrier structure 50 also includes a spacer 52, which is connected to the outer barrier ring 51. The spacer 52 is disposed between the end cap 40 and the end of the filter medium layer 30 and is bonded to the end of the filter medium layer 30.

[0034] Specifically, the spacer 52 is disposed between the end cap 40 and the end of the filter medium layer 30 and is bonded to the end of the filter medium layer 30, which is equivalent to constructing a three-dimensional support structure inside the filter medium layer 30.

[0035] It is worth noting that by setting the spacer 52, the spacer 52 provides further support and sealing for the filter media layer 30. When the filter media layer 30 is subjected to fluid pressure, the spacer 52 can evenly distribute the pressure to the entire filter media layer 30, ensuring the sealing effect at the end of the filter media layer 30 and preventing the liquid from leaking from the end of the filter media layer 30. This allows the pleated filter element to maintain a stable shape under high pressure environment (such as high pressure reverse osmosis system), greatly improving the overall structural toughness of the pleated filter element and reducing the risk of interlayer separation of the filter media layer 30 caused by frequent pressure fluctuations.

[0036] It is worth noting that the interval 52 also maintains a fixed distance between the fold peaks 31 and fold valleys 32 through physical barriers, ensuring the consistency of the fluid channels inside the folded filter element; it can effectively prevent channel blockage or local flow velocity abnormalities caused by compression or deformation of the filter media layer 30, so that the fluid passes through the filter media layer 30 in a laminar flow state and reduces the resistance loss caused by eddies and turbulence.

[0037] In this embodiment, as Figure 2 and Figure 3 As shown, the barrier structure 50 also includes an inner barrier ring 53, which is connected to the spacer 52. The inner barrier ring 53 is ring-shaped and is bonded to a number of folds 32.

[0038] It is worth noting that by setting the inner barrier ring 53, the direct impact of the fluid on the bends of the filter media layer 30 is further avoided, reducing the deformation or wear of the bends under the scouring of the fluid and extending the service life of the filter element; at the same time, the overall structural strength of the barrier structure 50 is improved.

[0039] Furthermore, along the circumference of the folded filter element, the outer barrier ring 51 maintains a consistent height in all directions, and the inner barrier ring 53 maintains a consistent height in all directions.

[0040] It should be noted that if the outer barrier ring 51 or the inner barrier ring 53 has some parts that are high and some parts that are low, when the liquid enters the outside of the pleated filter element and is filtered through the filter media layer 30, the pleats of the filter media layer 30 will sway from side to side. The pleats that are in direct contact with the high points of the outer (or inner) barrier rings may be damaged or even punctured by the swaying. Secondly, the liquid may enter the gaps between the pleats from the low points of the outer (or inner) barrier rings, which will also cause the filter media to sway and reduce the strength of the outer (or inner) barrier rings.

[0041] It is worth noting that the heights of the outer barrier ring 51 and the inner barrier ring 53 are consistent in all directions, allowing for minor deviations during manufacturing and assembly that do not affect the structural strength. This improves the structural strength of the outer barrier ring 51 and the inner barrier ring 53 and prevents large local height differences in the outer barrier ring 51 or the inner barrier ring 53 from puncturing the filter media layer 30 during filtration, thus affecting the overall service life of the pleated filter element.

[0042] It should be noted that, in this embodiment, the barrier structure 50 is integrally formed by the outer barrier ring 51, the inner barrier ring 53, and the spacer portion 52 through adhesive.

[0043] In one embodiment, such as Figure 3 As shown, along the axial direction of the folded filter element, the height of the outer barrier ring 51 is H1, and the height of the inner barrier ring 53 is H2, satisfying |H1-H2|≤2mm.

[0044] Specifically, in this embodiment, H1-H2=1mm.

[0045] It should be noted that when |H1-H2|>2mm, the difference between the height of the outer barrier ring 51 and the height of the inner barrier ring 53 is too large. When the filter media layer 30 is working to filter liquid, the folds of the filter media layer 30 will sway left and right under pressure. The excessive height difference causes the filter media layer 30 to be subjected to concentrated force on one side, which causes the filter media layer 30 to tilt and deform to the lower side, affecting the overall service life of the folded filter element.

[0046] It is worth noting that by controlling the height difference between the outer barrier ring 51 and the inner barrier ring 53 to not exceed 2mm, the supporting and protective effects of the two on the filter media layer 30 are balanced and matched, avoiding the concentrated force on one side of the filter media layer 30 due to excessive height difference, preventing the filter media layer 30 from tilting and deforming under fluid pressure, thereby extending the service life of the pleated filter element.

[0047] In this embodiment, as Figure 3 As shown, a groove 531 is provided on the inner barrier ring 53, and the end of the central rod 20 is embedded in the groove 531.

[0048] It is worth noting that by opening a groove 531 on the inner barrier ring 53, it is convenient to install the overall structure of the inner barrier ring 53 and the filter media layer 30 and the central rod 20 after assembly, and it can also play a role in fixing the barrier structure 50 as a whole.

[0049] In this embodiment, the filter media layer 30 includes a filter membrane and a support portion. The filter membrane is provided with several layers, and the support portion is provided on both sides of the filter membrane.

[0050] Specifically, the filter membrane is a regenerated cellulose filter membrane.

[0051] It should be noted that in other alternative embodiments, the filter membrane may also be selected as a cellulose acetate filter membrane, a polytetrafluoroethylene filter membrane, or a polyamide composite membrane.

[0052] Specifically, the support part is made of non-woven fabric.

[0053] It should be noted that non-woven fabrics have good structural support, which can effectively resist the stretching or wrinkling of the filter membrane and maintain the filtration shape of the filter membrane; in addition, non-woven fabrics have high porosity, which can allow the filtrate to pass through smoothly while ensuring support for the filter membrane.

[0054] It should be noted that the number of filter membrane layers can be selected according to the actual situation.

[0055] It is worth noting that the support portion provides structural support for the filter membrane, thereby improving the overall structural strength of the filter media layer 30.

[0056] In this embodiment, the barrier structure 50 is formed by curing with adhesive, which is an isocyanate compound. The Shore hardness of the barrier structure 50 is HA, which satisfies 50≤HA≤95.

[0057] Specifically, in this embodiment, the Shore hardness HA of the barrier structure 50 is 60.

[0058] It should be noted that, in other alternative embodiments, the Shore hardness of the barrier structure 50 can be adjusted within an optional range according to the actual situation.

[0059] It should be noted that when HA < 50, the overall strength and bonding strength between the adhesive and the filter membrane are poor. Under the action of pressure difference during filtration, the filter membrane may be damaged and detached, further affecting the sealing performance of the pleated filter element. When HA > 95, the Poisson's ratio v of the adhesive is ≥ 0.4995. At this time, the adhesive is regarded as a completely incompressible solid and almost loses its elasticity. Under the action of pressure difference, the adhesive and the filter membrane will generate an interaction force in the legs 33 of the pleated filter element, increasing the risk of the adhesive puncturing the filter membrane.

[0060] It is worth noting that by controlling the Shore hardness of the adhesive after curing, the overall strength and bonding strength of the adhesive and the filter membrane are ensured, while the adhesive also has a certain degree of elasticity to prevent it from puncturing the filter membrane after curing.

[0061] It should be noted that isocyanate compounds contain a large number of NCO functional groups (NCO is the chemical abbreviation for isocyanate group, whose chemical structure is -N=C=O, and is the core functional group constituting isocyanate compounds), and regenerated cellulose filter membranes are hydrophilic materials with a large amount of glycerol attached to their surface. Due to the presence of water and glycerin, and the inherent properties of the substrate, regenerated cellulose filter membranes naturally contain and are attached with a large number of active groups, including hydroxyl and amino groups. The bonding between the two is based on the synergistic effect of chemical reaction and physical action. The NCO functional groups in the adhesive react with the active groups of the substrate to generate a three-dimensional network polymer containing urethane bonds and urea bonds, achieving chemical bonding. At the physical level, the liquid adhesive penetrates into the micropores of the substrate and forms a mechanically interlocked structure after curing. The strongly polar groups (such as ester bonds and ether bonds) in the adhesive layer molecules are tightly adsorbed to the surface of the substrate through van der Waals forces and hydrogen bonds. The flexible segments provided by the alcohol in the adhesive layer give the adhesive layer elasticity, while the rigid segments formed by the isocyanate provide strength. The two work together to enable the adhesive layer to resist peel stress and buffer thermal expansion and contraction, ultimately forming a strong and durable adhesive layer at the interface.

[0062] According to an embodiment of the present invention, in a second aspect, a filter is provided, including the pleated filter element described above.

[0063] Specifically, Figure 1 It is a filter, including a housing 60 and a pleated filter element inside the housing 60.

[0064] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A pleated filter element, characterized in that, include: The outer casing (10) has a first through hole. A center rod (20) is disposed inside the outer shell (10), the outer shell (10) and the center rod (20) are coaxially disposed, and a second through hole is provided on the center rod (20); A filter media layer (30) is disposed between the outer shell (10) and the central rod (20). The filter media layer (30) is in the shape of a ring fold. The filter media layer (30) has a number of peaks (31), a number of valleys (32) and a number of legs (33). The two ends of the legs (33) are respectively connected to the adjacent peaks (31) and valleys (32). The peaks (31) abut against the outer shell (10), and the valleys (32) abut against the central rod (20). End caps (40), two end caps (40) are provided, and the two end caps (40) are respectively provided at both ends of the filter medium layer (30); Barrier structure (50), along the axial direction of the folded filter element, the barrier structure (50) is disposed at at least one end of the filter medium layer (30), the barrier structure (50) includes an outer barrier ring (51), the outer barrier ring (51) is annular, and the outer barrier ring (51) is bonded to a plurality of the folds (31).

2. The pleated filter element according to claim 1, characterized in that, Along the circumference of the folded filter element, the outer barrier ring (51) maintains a consistent height in all directions.

3. The pleated filter element according to claim 2, characterized in that, The barrier structure (50) further includes a spacer (52), which is connected to the outer barrier ring (51). The spacer (52) is disposed between the end cap (40) and the end of the filter medium layer (30) and is bonded to the end of the filter medium layer (30).

4. The pleated filter element according to claim 3, characterized in that, The barrier structure (50) further includes an inner barrier ring (53), which is connected to the spacer (52). The inner barrier ring (53) is annular and is bonded to a plurality of the folds (32).

5. The pleated filter element according to claim 4, characterized in that, Along the circumference of the folded filter element, the inner barrier ring (53) maintains a consistent height in all directions.

6. The pleated filter element according to claim 5, characterized in that, Along the axial direction of the folded filter element, the height of the outer barrier ring (51) is H1, and the height of the inner barrier ring (53) is H2, satisfying |H1-H2|≤2mm.

7. The pleated filter element according to claim 4, characterized in that, The inner barrier ring (53) has a groove (531) and the end of the central rod (20) is embedded in the groove (531).

8. The pleated filter element according to any one of claims 1-7, characterized in that, The filter media layer (30) includes a filter membrane, and the filter membrane is provided with at least one layer.

9. The pleated filter element according to any one of claims 4-7, characterized in that, The barrier structure (50) is formed by curing with adhesive, which is an isocyanate compound. The Shore hardness of the barrier structure (50) is HA, which satisfies 50≤HA≤95.

10. A filter, characterized in that, Includes the pleated filter element according to any one of claims 1 to 9.

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