Folding filter element and filter

Abstract

The utility model relates to the technical field of filtration, and discloses a folding filter element and a filter, and the folding filter element comprises a shell surrounding the outer part of a central rod at intervals to form an annular cavity; the filter medium layer is located in the annular cavity, and the pleats surround the center rod and are connected end to end to form a plurality of pleats; each fold consists of a fold valley, a fold peak and a leg; the pleats are at least divided into a first pleat and a fourth pleat; the fold valley of the fourth fold is in contact with the central rod, and the length of the fourth fold is L; a gap is formed between the fold valley of the first fold and the central rod; and the length L3 of the first pleat is greater than or equal to 0.1 L and less than or equal to 0.4 L. The fold valleys of the first folds do not contact with the center rod, the number of folds of the filter medium layer can be increased near the center rod, and the filter area is increased; the space of the inner ring of the filtering medium layer is loose, so that the filtering flux loss caused by resistance formed by material liquid circulation due to too close two adjacent legs is avoided. And the filtering area of the filtering medium layer is further increased by limiting the length of the first pleats.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration, in particular to a folded filter element and a filter. Background Art

[0002] Pleated filter elements, also known as pleated filter elements, effectively intercept tiny particles and colloidal debris. They feature a large membrane filtration area, high dirt holding capacity, long service life, high filtration precision, high flow rate, and exceptionally high filtration efficiency. Pleated filter elements are primarily made of stainless steel mesh, sintered mesh, polypropylene, polytetrafluoroethylene, polyethersulfone, and polyvinylidene fluoride. They have a wide range of applications and generally meet the filtration requirements of industries such as food and beverage processing, chemicals, and pharmaceuticals. They are essential components in the fluid handling processes of these industries.

[0003] Pleated filter elements generally use pleated filter membranes; pleated filter membranes are widely used in the filtration and purification of fluids. In actual pleated filter element applications, support nets are usually set on both sides of the pleated filter membrane. The support nets and the pleated filter membrane are folded together to form pleats and then installed between the center rod and the outer shell.

[0004] A pleated filter membrane typically consists of a filter medium layer pleated to form an undulating pleated structure. The pleats are uniform in height and spacing, and after being flipped over, they are connected end to end to form a closed ring, evenly distributed in the cavity between the outer shell and the center rod. The troughs of the pleat structure form the inner ring, directly contacting the center rod, while the peaks of the pleat form the outer ring, directly contacting the outer shell. The troughs and peaks are connected by legs.

[0005] For the pleated filter element with the above structure, since the total length of the outer ring is significantly greater than the total length of the inner ring, the gaps between the fold peaks of the outer ring are too large, and the gaps between the fold valleys of the inner ring are too small, resulting in insufficient space utilization and a small effective filtration area. In addition, the fold peaks and fold valleys are in direct contact with the outer shell and the center rod. Under the force of liquid flow, the membrane material located at the fold peaks and fold valleys is easily bent, deformed, and damaged, seriously affecting the integrity and performance of the pleated filter element. If the thickness of the fold peaks and fold valleys is increased to overcome the above-mentioned membrane material problem, the thickness of the fold peaks and fold valleys will be greater than the thickness of the legs, seriously affecting the amount of filter media that can be installed. Utility Model Content

[0006] In view of this, the utility model provides a pleated filter element to solve the problem of the existing structure of the pleated filter element, in which the total length of the outer ring is significantly greater than the total length of the inner ring, resulting in large gaps between the fold peaks of the outer ring and small gaps between the fold valleys of the inner ring, insufficient space utilization and small effective filtration area.

[0007] In a first aspect, the utility model provides a pleated filter element, comprising:

[0008] center pole;

[0009] A shell is spaced around the outside of the central rod to form an annular cavity between the central rod and the shell;

[0010] End covers are used to fix the two ends of the sealing ring cavity; holes for the feed liquid to pass through are provided on the central rod, the outer shell and the end covers;

[0011] The filter medium layer is located in the annular cavity, and the filter medium layer is pleated around the center rod and connected end to end to form a plurality of pleats; the pleats are composed of a valley close to the center rod, a peak in contact with the outer shell, and a leg; the legs connect the valley and the peak; the pleats are divided into at least: a first pleat and a fourth pleat; the valley of the fourth pleat is in direct contact with the center rod, and the length of the fourth pleat is L; a gap is provided between the valley of the first pleat and the center rod; the range of the length L3 of the first pleat is: 0.1L≤L3≤0.4L.

[0012] Beneficial Effects: This application utilizes the above-mentioned technical solution to fully utilize the ample space at the fold peak. Furthermore, because the first pleats do not contact the center rod, the number of pleats in the filter medium layer can be increased within the limited space near the center rod, thereby increasing the effective filtration area of ​​the filter medium layer. Furthermore, the inner ring of the filter medium layer is kept loose, preventing adjacent legs from being too tightly connected, which could create localized resistance to liquid flow and lead to loss of filtration flux. Furthermore, by limiting the length of the first pleats, the spatial relationship of the filter medium layer can be further optimized, increasing the filtration area of ​​the filter medium layer without causing compression and deformation of the filter medium layer.

[0013] Optionally, the pleats further include:

[0014] A third pleat, wherein a gap is provided between the fold valley of the third pleat and the central rod; the length of the third pleat is shorter than the length of the fourth pleat, and the length of the third pleat is longer than the length of the first pleat

[0015] Optionally, the pleats further include:

[0016] A second pleat, wherein a gap is provided between the fold valley of the second pleat and the central rod; the length of the second pleat is shorter than the length of the third pleat, and the length of the second pleat is longer than the length of the first pleat.

[0017] Optionally, the length L1 of the third pleat is in the range of: 0.7L <L1≤0.95L。

[0018] Optionally, the length L2 of the second pleat is in the range of: 0.4L <L2≤0.7L。

[0019] Optionally, the fourth pleats account for 35% to 55% of the total pleats.

[0020] And / or, the length L of the fourth pleat ranges from 11 mm to 14 mm.

[0021] Optionally, at least one pleat shorter than the length of the fourth pleat is arranged between adjacent fourth pleats.

[0022] Optionally, the plurality of pleats are periodically arranged in the order of the fourth pleat, the first pleat, the fourth pleat and the third pleat.

[0023] Optionally, the plurality of pleats are periodically arranged in the order of the fourth pleat, the second pleat, the first pleat, the fourth pleat and the third pleat;

[0024] Alternatively, the plurality of pleats are periodically arranged in the order of the fourth pleat, the third pleat, the first pleat, the fourth pleat, and the second pleat;

[0025] Alternatively, the plurality of pleats are periodically arranged in the order of the fourth pleat, the third pleat, the second pleat, the fourth pleat and the first pleat;

[0026] Alternatively, the plurality of pleats are periodically arranged in the order of the fourth pleat, the first pleat, the fourth pleat, the second pleat, the fourth pleat and the third pleat;

[0027] Alternatively, multiple pleats are arranged periodically in the order of fourth pleat, first pleat, first pleat, fourth pleat, second pleat, second pleat, fourth pleat and third pleat; and the lengths of adjacent first pleats are the same or different; the lengths of adjacent second pleats are the same or different.

[0028] In a second aspect, the utility model provides a filter, comprising:

[0029] The folded filter element;

[0030] The pleated filter element is arranged in the shell, and the shell is provided with a channel for feeding liquid to enter and exit, an inlet and an outlet connected with the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic diagram of the three-dimensional structure of the pleated filter element provided in the first embodiment of the present utility model;

[0033] Figure 2 This is a schematic cross-sectional view of the pleated filter element provided in the first embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of a partial three-dimensional structure of the filter medium layer provided in the first embodiment of the present utility model;

[0035] Figure 4 This is a schematic diagram of the transverse cross-sectional structure of the pleated filter element provided in the first embodiment of the present utility model;

[0036] Figure 5 This is a schematic diagram of a partial transverse cross-sectional structure of the filter medium layer provided in the first embodiment of the present utility model;

[0037] Figure 6 This is a schematic cross-sectional view of the filter provided in the first embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of a partial transverse cross-sectional structure of a filter medium layer provided in the second embodiment of the present utility model;

[0039] Figure 8 This is a schematic diagram of a partial transverse cross-sectional structure of a filter medium layer provided in the third embodiment of the present utility model;

[0040] Figure 9 This is a schematic diagram of a partial transverse cross-sectional structure of a filter medium layer provided in a fourth embodiment of the present utility model;

[0041] Figure 10 This is a schematic diagram of a partial transverse cross-sectional structure of a filter medium layer provided in a fifth embodiment of the present utility model;

[0042] Figure 11 This is a schematic diagram of a partial transverse cross-sectional structure of the filter medium layer provided in the sixth embodiment of the present utility model.

[0043] Description of reference numerals:

[0044] 1. Center rod; 2. Outer shell; 3. End cap; 4. Filter medium layer; 5. Valley; 6. Peak; 7. Leg; 8. First pleat; 9. Second pleat; 10. Third pleat; 11. Fourth pleat; 12. Pleated filter element; 13. Outer shell. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0046] Implementation Method 1

[0047] like Figures 1 to 5 A specific embodiment of the pleated filter element shown includes: a central rod 1, a shell 2, an end cap 3 and a filter medium layer 4. The pleated filter element described in the present application has a low pressure difference effect.

[0048] like Figure 1 and Figure 2 As shown, the outer shell 2 surrounds the center rod 1 at intervals, forming an annular cavity between the center rod 1 and the outer shell 2. The outer shell 2 is coaxially arranged with the center rod 1. The end caps 3 securely seal the two ends of the annular cavity. Holes for the feed liquid to pass through are provided on the center rod 1, outer shell 2, and end caps 3. When multiple pleated filter elements are connected for use, interconnected holes are provided on the connected end caps 3.

[0049] like Figures 3 to 5As shown, the filter medium layer 4 is located in the annular cavity. The filter medium layer 4 includes: a filter membrane and a support layer. The support layer can be a non-woven fabric or a sieve, and is used to support the filter membrane; the filter membrane is used for filtration. The filter medium layer 4 is pleated around the central rod 1 and after being connected end to end, multiple pleats are formed, presenting a state of undulation; the end-to-end connection method can be bonding or welding. The pleat consists of a valley 5 close to the central rod 1, a peak 6 contacting the housing 2, and a leg 7; the leg 7 connects the valley 5 and the peak 6; each pleat includes two adjacent legs 7. The pleats are at least divided into: a first pleat 8 and a fourth pleat 11; the pleats can also include: a third pleat 10. The first pleat 8 is also called a short pleat, the third pleat 10 is also called a longer pleat, and the fourth pleat 11 is also called a long pleat. The valley 5 of the fourth pleat 11 directly contacts the central rod 1, and the length of the fourth pleat 11 is the distance L between the central rod 1 and the housing 2; there is a gap between the valley 5 of the first pleat 8 and the central rod 1, and between the valley 5 of the third pleat 10 and the central rod 1; the length of the third pleat 10 is shorter than the length of the fourth pleat 11, and the length of the third pleat 10 is longer than the length of the first pleat 8. The main purpose of setting the first pleat 8 is to ensure that the inner space of the fourth pleat 11 is not compressed, so that the fourth pleat 11 with the largest filtration area can be fully utilized. Preferably, the length range of the fourth pleat 11 is: 11 mm to 14 mm. Specifically, the range of the length L1 of the third pleat 10 is: 0.7L < L1 ≤ 0.95L; the range of the length L3 of the first pleat 8 is: 0.1L ≤ L3 ≤ 0.4L. The range of the distance d1 between the first pleat 8 and the central rod 1 is: 7.5 mm to 11 mm; the range of the distance d3 between the third pleat 10 and the central rod 1 is: 1 mm to 4.5 mm. The proportion range of the number of the fourth pleats 11 is: 35% - 55%; within this proportion range of the number of the fourth pleats 11, it can not only ensure the support performance of the filter medium layer 4, so that the filter medium layer 4 can also ensure structural stability and the ability to resist bending deformation under the action of external pressure, but also ensure that the number of the fourth pleats 11 is not too large, so as not to damage the filtration flux. At least one pleat shorter than the length of the fourth pleat 11 is arranged at intervals between adjacent fourth pleats 11; that is, the peaks 6 of the fourth pleats 11 are not adjacent to the peaks 6 of other fourth pleats 11, otherwise, the inner connection of the fourth pleats 11 will be too tight, resulting in a reduction of the effective filtration area. Multiple pleats are arranged periodically in the order of the fourth pleat 11, the first pleat 8, the fourth pleat 11, and the third pleat 10, that is, four pleats are set as a cycle. The length distribution of the pleats is set in a certain periodic pattern, which is for the convenience of the program setting of the pleating machine and to ensure the periodic sequential arrangement of the above pleat lengths.

[0050] As Figure 6As shown, the present utility model further provides a filter, comprising: the folded filter element 12 and the housing 13; the folded filter element 12 is disposed within the housing 13, and the housing 13 is provided with a channel, an inlet, and an outlet for the feed liquid to enter and exit, which are connected to the holes. When using a single folded filter element 12, the holes provided on one end cap 3 are connected to the housing 13, and the other end cap 13 is closed. The filter of the present application has the effect of low pressure difference.

[0051] Embodiment 2

[0052] As Figure 7 shown, the pleats further comprise: a second pleat 9, also known as a shorter pleat. There is a gap between the valley 5 of the second pleat 9 and the central rod 1; the length of the second pleat 9 is shorter than the length of the third pleat 10 and longer than the length of the first pleat 8. The main purpose of providing the second pleat 9 is also to ensure that the inner space of the fourth pleat 11 is not compressed, allowing the fourth pleat 11 with the largest filtering area to be fully utilized. Specifically, the range of the length L2 of the second pleat 9 is: 0.4L < L2 ≤ 0.7L. The distance d2 between the second pleat 9 and the central rod 1 ranges from 4.5 mm to 7.4 mm; multiple pleats are arranged periodically in the order of the fourth pleat 11, the second pleat 9, the first pleat 8, the fourth pleat 11, and the third pleat 10, that is, five pleats are set as a cycle. Other technical solutions are the same as those in Embodiment 1.

[0053] Embodiment 3

[0054] As Figure 8 shown, multiple pleats are arranged periodically in the order of the fourth pleat 11, the third pleat 10, the first pleat 8, the fourth pleat 11, and the second pleat 9, that is, five pleats are set as a cycle. Other technical solutions are the same as those in Embodiment 2.

[0055] Embodiment 4

[0056] As Figure 9 shown, multiple pleats are arranged periodically in the order of the fourth pleat 11, the third pleat 10, the second pleat 9, the fourth pleat 11, and the first pleat 8, that is, five pleats are set as a cycle. Other technical solutions are the same as those in Embodiment 2.

[0057] Embodiment 5

[0058] As Figure 10 shown, multiple pleats are arranged periodically in the order of the fourth pleat 11, the first pleat 8, the fourth pleat 11, the second pleat 9, the fourth pleat 11, and the third pleat 10, that is, six pleats are set as a cycle. Other technical solutions are the same as those in Embodiment 2.

[0059] Embodiment 6

[0060] As Figure 11As shown, the plurality of pleats are arranged in a periodic sequence of the fourth pleat 11, the first pleat 8, the first pleat 8, the fourth pleat 11, the second pleat 9, the second pleat 9, the fourth pleat 11 and the third pleat 10, that is, eight pleats are arranged as one period. Figure 11 In the embodiment, the lengths of adjacent first pleats 8 can be the same or different; the lengths of adjacent second pleats 9 can be the same or different. Other technical solutions are the same as those in the second embodiment.

[0061] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A pleated filter element, characterized in that: include: Center rod (1); An outer shell (2) is spaced around the outside of the central rod (1), forming an annular cavity between the central rod (1) and the outer shell (2); End covers (3) are used to fix the two ends of the sealing ring cavity; holes for feeding liquid to pass through are provided on the central rod (1), the outer shell (2) and the end covers (3); A filter medium layer (4) is located in the annular cavity, and the filter medium layer (4) is pleated around the central rod (1) and connected end to end to form a plurality of pleats; the pleats are composed of a folded valley (5) close to the central rod (1), a folded peak (6) in contact with the outer shell (2), and a leg (7); the leg (7) connects the folded valley (5) and the folded peak (6); the pleats are divided into at least: a first pleat (8) and a fourth pleat (11); the folded valley (5) of the fourth pleat (11) is in direct contact with the central rod (1), and the length of the fourth pleat (11) is L; a gap is provided between the folded valley (5) of the first pleat (8) and the central rod (1); the range of the length L3 of the first pleat (8) is: 0.1L≤L3≤0.4L.

2. The pleated filter element according to claim 1, characterized in that: The pleats also include: A third pleat (10), wherein a gap is provided between the fold (5) of the third pleat (10) and the central rod (1); the length of the third pleat (10) is shorter than the length of the fourth pleat (11), and the length of the third pleat (10) is longer than the length of the first pleat (8).

3. The pleated filter element according to claim 2, characterized in that: The pleats also include: A second pleat (9), wherein a gap is provided between the fold (5) of the second pleat (9) and the central rod (1); the length of the second pleat (9) is shorter than the length of the third pleat (10), and the length of the second pleat (9) is longer than the length of the first pleat (8).

4. The pleated filter element according to claim 2, characterized in that: The length L1 of the third pleat (10) is in the range of: 0.7L <L1≤0.95L。 5. The pleated filter element according to claim 3, characterized in that: The length L2 of the second pleat (9) is in the range of: 0.4L <L2≤0.7L。 6. The pleated filter element according to any one of claims 1 to 5, characterized in that: The number of the fourth folds (11) ranges from 35% to 55%; And / or, the length L of the fourth pleat (11) ranges from 11 mm to 14 mm.

7. The pleated filter element according to any one of claims 1 to 5, characterized in that: At least one pleat shorter than the length of the fourth pleat (11) is arranged between adjacent fourth pleats (11).

8. The pleated filter element according to claim 2 or 4, characterized in that: The plurality of pleats are periodically arranged in the order of a fourth pleat (11), a first pleat (8), a fourth pleat (11), and a third pleat (10).

9. The pleated filter element according to claim 3 or 5, characterized in that: The plurality of pleats are periodically arranged in the order of a fourth pleat (11), a second pleat (9), a first pleat (8), a fourth pleat (11), and a third pleat (10); Alternatively, the plurality of pleats are periodically arranged in the order of the fourth pleat (11), the third pleat (10), the first pleat (8), the fourth pleat (11), and the second pleat (9); Alternatively, the plurality of pleats are periodically arranged in the order of the fourth pleat (11), the third pleat (10), the second pleat (9), the fourth pleat (11), and the first pleat (8); Alternatively, the plurality of pleats are periodically arranged in the order of the fourth pleat (11), the first pleat (8), the fourth pleat (11), the second pleat (9), the fourth pleat (11), and the third pleat (10); Alternatively, the plurality of pleats are periodically arranged in the order of a fourth pleat (11), a first pleat (8), a first pleat (8), a fourth pleat (11), a second pleat (9), a second pleat (9), a fourth pleat (11), and a third pleat (10); and the lengths of adjacent first pleats (8) are the same or different; and the lengths of adjacent second pleats (9) are the same or different.

10. A filter, characterized in that: include: The pleated filter element (12) according to any one of claims 1 to 9; A housing (13), wherein the folded filter element (12) is arranged in the housing (13), and the housing (13) is provided with a channel for feeding liquid to enter and exit, an inlet, and an outlet that are in communication with the hole.

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