Folding filter element and filter

Abstract

The utility model relates to the technical field of biological medicine filtration, and discloses a folding filter element and a filter, the folding filter element comprises a filter element main body, the filter element main body comprises a filter element shell, a center rod and a filter medium layer, and the filter medium layer is arranged between the filter element shell and the center rod; the filter medium layer comprises a plurality of folds formed by folding, and a head fold and a tail fold, which are axially parallel, of the filter medium layer are bonded through an adhesive to form an annular structure; the surface of the filtering medium layer is provided with a head fold and a tail fold in a protruding mode, the bonding position between the head fold and the tail fold comprises an adhesive section, and the adhesive section protrudes out of the surface of at least one side of the head fold and the surface of at least one side of the tail fold and is bonded with the head fold and the tail fold. The folding filter element can adapt to filter membranes with different roughness and pore sizes, and the sealing effect of the folding filter element is guaranteed on the basis that the filter membranes are not damaged.

Description

Technical Field

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

[0002] The filter membrane of the pleated filter element is arranged in a pleated manner, which greatly increases the filtration area per unit volume and improves the filtration efficiency and capacity. Therefore, it is widely used in many fields, such as water treatment industry, petrochemical industry, pharmaceutical industry, food and beverage industry, and electronic semiconductor field. Filter membranes of different materials and pore sizes can be selected as needed to effectively remove particulate matter, bacteria and suspended matter.

[0003] For example, the patent with publication number CN215693212U discloses an improved filter, in which the filter element is a folded cylindrical filter element composed of a long strip of filter paper repeatedly folded into a corrugated shape and bonded at both ends to form a hollow cylindrical shape. However, when the first fold and the last fold are directly bonded, the pore size and roughness of the filter membrane will affect the bonding effect of the adhesive. When the pore size or roughness of the filter membrane is small, the direct bonding effect between the first fold and the last fold is poor, the bonding effect is weak, and there is a risk of leakage. Utility Model Content

[0004] In view of this, the utility model provides a pleated filter element and a filter to solve the problem that when the pore size or roughness of the filter membrane is small, the direct bonding effect between the first fold and the tail fold is poor, the adhesion effect is weak, and there is a risk of leakage.

[0005] In the first aspect, the utility model provides a pleated filter element, including a filter element body, wherein the filter element body includes a filter element shell, a center rod and a filter medium layer, wherein the filter medium layer is arranged between the filter element shell and the center rod; the filter medium layer includes a plurality of pleats formed by folding, and the axially parallel first fold and tail fold of the filter medium layer are tightly bonded to form an annular structure; the bonding portion between the first fold and the tail fold includes an adhesive segment, and the adhesive segment is protruding from the surface of at least one side of the first fold and the tail fold, and is bonded to both the first fold and the tail fold.

[0006] Beneficial effects: The first fold and the tail fold are bonded to the adhesive section, and the connection between the first fold and the tail fold is achieved through the adhesive section. Since the adhesive section has a strong bonding effect and the adhesive is not affected by the roughness and pore size of the first fold or the tail fold, it can adapt to filter membranes with different roughness and pore sizes, and can always maintain a bonding state with the first fold or the tail fold, thereby ensuring the sealing effect of the folded filter element without damaging the filter membrane, and preventing leakage caused by poor penetration effect and weak adhesion effect due to the properties of the filter medium layer itself under high pressure.

[0007] In an optional embodiment, the bonding point between the first fold and the tail fold also includes a first glue penetration section and a second glue penetration section; the first glue penetration section is located on the first fold; the connection between the first fold and the adjacent fold is a first bend; the first glue penetration section is arranged at one end of the first fold away from the first bend, and is consistent with the axial height of the first fold; the second glue penetration section is located on the tail fold; the connection between the tail fold and the adjacent fold is a second bend; the second glue penetration section is arranged at one end of the tail fold away from the second bend, and is consistent with the axial height of the tail fold; in the thickness direction of the first fold and the tail fold, the first glue penetration section and the second glue penetration section are bonded.

[0008] Beneficial effect: Since the first glue penetration section and the second glue penetration section are bonded, that is, the first fold and the tail fold are directly and tightly connected, the sealing of the bonding between the first fold and the tail fold can be effectively guaranteed.

[0009] In an optional embodiment, the bonding point between the first fold and the tail fold further includes a first glue penetration section and a second glue penetration section; the first glue penetration section is located on the first fold, and is formed by the glue penetrating into the interior of the first fold and then solidifying; the connection between the first fold and the adjacent fold is a first bend; the first glue penetration section is arranged at an end of the first fold away from the first bend, and is consistent with the axial height of the first fold; the second glue penetration section is located on the tail fold, and is formed by the glue penetrating into the interior of the tail fold and then solidifying; the connection between the tail fold and the adjacent fold is the second bend at; the second glue penetration section is arranged at one end of the tail fold away from the second bend, and is consistent with the axial height of the tail fold; in the thickness direction of the first fold and the tail fold, there is a gap between the first glue penetration section and the second glue penetration section; the adhesive section includes a first adhesive section, the first adhesive section is located in the gap, and is bonded to both the first glue penetration section and the second glue penetration section; and in the axial direction of the filter medium layer, the first adhesive section is consistent with the height of the first glue penetration section and the second glue penetration section.

[0010] Beneficial effect: By setting the first adhesive section, it can be ensured that in the thickness direction of the first fold and the tail fold, the first glue penetration section and the second glue penetration section are directly bonded to the first adhesive, and the first adhesive section is directly set between the first glue penetration section and the second glue penetration section, which can ensure the sealing effect and connection strength of the connection between the first fold and the tail fold.

[0011] In an optional embodiment, the adhesive segment includes a second adhesive segment, which is protruding from one end of the first glue penetration segment and the second glue penetration segment away from the first bend or the second bend, and is bonded to both the first glue penetration segment and the second glue penetration segment.

[0012] Beneficial effect: By setting the second adhesive section, it can be ensured that at the end away from the first bend or the second bend, the first glue penetration section and the second glue penetration section are both bonded to the second adhesive section, further ensuring the connection strength and sealing effect between the first fold and the tail fold.

[0013] In an optional embodiment, in the radial direction of the filter medium layer, the lengths of the first fold and the tail fold are consistent, and the ratio of the length of the second adhesive segment to the length of the first fold is in the range of 0.1-1.1.

[0014] Beneficial effect: When the ratio of the length of the second adhesive segment to the length of the first fold is less than 0.1, the length of the second adhesive segment is too short to ensure that the first fold and the tail fold are completely and tightly connected. At the same time, since pressurization is generally performed during the filtration process, the too short second adhesive segment is compressed during the pressurization process, and there is a possibility of separation between the first fold and the tail fold; when the ratio of the length of the second adhesive segment to the length of the first fold is greater than 1.1, the second adhesive segment accounts for too large a proportion in the radial direction of the filter medium layer. At the same time, since the adhesive has a high hardness after molding, the molded filter medium layer may not be able to fit with the filter element housing and the center rod, and may even cause damage to the filter medium layer, affecting the filtration efficiency.

[0015] In an optional embodiment, the adhesive segment includes two third adhesive segments. In the axial direction of the filter medium layer, the two third adhesive segments are respectively protruded at the two ends of the first glue penetration segment and the second glue penetration segment, and the third adhesive segment is bonded to both the first glue penetration segment and the second glue penetration segment.

[0016] Beneficial effect: By setting the third adhesive segment, it can be ensured that in the axial direction of the filter medium layer, one end of the first glue penetration segment and the second glue penetration segment are bonded to a third adhesive segment, and the other end is bonded to another third adhesive segment, further ensuring the connection strength and sealing effect between the first fold and the tail fold.

[0017] In an optional embodiment, in the axial direction of the filter medium layer, the lengths of the first fold and the tail fold are consistent, and the height of the third adhesive segment is less than or equal to 5 mm.

[0018] Beneficial effect: The height of the third adhesive segment is controlled below 5 mm, which not only ensures the connection strength and sealing effect between the first fold and the tail fold, but also avoids the third adhesive segment from affecting the connection between the two ends of the filter element body and the end cover, so that the two ends of the filter element body and the end cover can be normally connected.

[0019] In an optional embodiment, the adhesive segment includes two fourth adhesive segments, and the two fourth adhesive segments are respectively arranged on a side of the first glue penetration segment and the second glue penetration segment that are away from each other.

[0020] Beneficial effect: By setting the fourth adhesive segment, the connection strength between the second adhesive segment and the third adhesive segment and the first glue penetration segment and the second glue penetration segment can be further strengthened, ensuring the connection strength and sealing effect between the first fold and the tail fold.

[0021] In an optional embodiment, in the thickness directions of the first fold and the tail fold, the ratio of the total thickness of the adhesive segment to the sum of the thickness of the first fold and the tail fold is less than or equal to 2.

[0022] Beneficial effect: Since the filter medium layer includes multiple folds formed by folding, if the thickness of the connection between the first fold and the last fold is large, the adhesive section is easy to contact with the filter medium layer of the adjacent fold, affecting the filtering effect of the filter medium layer of the adjacent fold, and after the adhesive is cured, it is easy to damage the filter medium layer of the adjacent fold, and there is a risk of leakage.

[0023] In an optional embodiment, in the radial direction of the filter medium layer, the lengths of the first fold and the tail fold are consistent, the lengths of the first glue penetration section and the second glue penetration section are consistent, and the ratio of the first glue penetration section to the length of the first fold ranges from 0.1 to 0.9.

[0024] Beneficial effect: In the radial direction of the filter medium layer, the smaller the length of the first glue penetration section and the second glue penetration section is, the larger the effective filtration area of ​​the first fold and the tail fold is. However, due to the poor uniformity of the penetration of the adhesive on the first fold or the tail fold, the adhesive distribution of the first glue penetration section and the second glue penetration section is uneven; when the ratio between the length of the first glue penetration section and the first fold is less than 0.1, it is very likely that some areas of the first glue penetration section and the second glue penetration section are not bonded, resulting in poor sealing between the first fold and the tail fold, and the problem of overall filtration failure; when the ratio between the length of the first glue penetration section and the first fold is greater than 0.9, the first fold and the tail fold are excessively penetrated by the adhesive, affecting the effective filtration area. At the same time, due to the high hardness of the adhesive after curing, the overall hardness of the first glue penetration section and the second glue penetration section increases. When the length of the first glue penetration section or the second glue penetration section in the radial direction is too long, it is very easy to cause damage to the filter medium layer near the first glue penetration section or the second glue penetration section.

[0025] In an optional embodiment, the pleats include pleat peaks, pleat valleys and connecting legs; the pleat peaks are located on the side of the filter medium layer close to the filter element housing; the pleat valleys are located on the side of the filter medium layer close to the center rod; the connecting legs are arranged between the pleat peaks and the pleat valleys for connecting the pleat peaks and the pleat valleys; in the radial direction of the filter medium layer, the lengths of the first fold and the tail fold are consistent, and the ratio between the length of the first fold and the length of the connecting leg is in the range of 0.2-0.9.

[0026] Beneficial effect: When the ratio between the length of the first fold and the length of the connecting leg is less than 0.2, the length of the first fold or the tail fold is too short, resulting in a shorter length of the first glue penetration section and the second glue penetration section, and an effective seal between the first fold and the tail fold cannot be achieved; when the ratio between the length of the first fold and the length of the connecting leg is greater than 0.9, it is easy for the second adhesive section to protrude from the periphery of the filter medium layer, causing the second adhesive section to contact the filter element housing, making it difficult to install the filter medium layer between the center rod and the filter element housing. Therefore, the ratio between the length of the first fold and the length of the connecting leg is limited to the range of 0.2-0.9, which can not only ensure the sealed connection between the first fold and the tail fold, but also facilitate the installation of the filter medium layer.

[0027] In a second aspect, the utility model further provides a filter, comprising the above-mentioned pleated filter element.

[0028] Beneficial effect: Because the filter includes a pleated filter element, it has the same effect as the pleated filter element, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions 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 creative labor.

[0030] Figure 1 This is a front view of a filter element according to an embodiment of the utility model;

[0031] Figure 2 It is a side cross-sectional view of the filter element of the embodiment of the utility model;

[0032] Figure 3 It is a cross-sectional schematic diagram of the filter element body of an embodiment of the utility model;

[0033] Figure 4 A schematic diagram of the position structure of the adhesive section of an embodiment of the utility model;

[0034] Figure 5 This is another schematic diagram of the position structure of the adhesive segment of an embodiment of the utility model;

[0035] Figure 6 This is another schematic diagram of the position structure of the adhesive segment of the embodiment of the utility model;

[0036] Figure 7 This is another schematic diagram of the position structure of the adhesive segment of the embodiment of the utility model;

[0037] Figure 8 This is another schematic diagram of the position structure of the adhesive segment of the embodiment of the utility model;

[0038] Fig. 9 This is another schematic diagram of the position structure of the adhesive segment of the embodiment of the utility model;

[0039] Fig.10 This is another schematic diagram of the position structure of the adhesive section of the embodiment of the utility model.

[0040] Description of reference numerals:

[0041] 1. Filter element body; 11. Filter element shell; 12. Center rod; 13. Filter medium layer; 131. Pleats; 1311. Pleat peaks; 1312. Pleat valleys; 1313. Connecting legs; 132. First fold; 133. Last fold; 134. Adhesive segment; 1341. First adhesive segment; 1342. Second adhesive segment; 1343. Third adhesive segment; 1344. Fourth adhesive segment; 135. First glue penetration segment; 136. Second glue penetration segment; 2. Interface end cap; 3. Sealing end cap. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0043] Combine the following Figures 1 to 10 , describing an embodiment of the utility model.

[0044] According to an embodiment of the utility model, on the one hand, a pleated filter element is provided, comprising a filter element body 1, wherein the filter element body 1 comprises a filter element shell 11, a center rod 12 and a filter medium layer 13, wherein the filter medium layer 13 is arranged between the filter element shell 11 and the center rod 12; the filter medium layer 13 comprises a plurality of pleats 131 formed by folding, and an axially parallel first fold 132 and tail fold 133 of the filter medium layer 13 are tightly bonded to form an annular structure; the bonding portion between the first fold 132 and the tail fold 133 comprises an adhesive segment 134, wherein the adhesive segment 134 is protruding from the surface of at least one side of the first fold 132 and the tail fold 133, and is bonded to both the first fold 132 and the tail fold 133.

[0045] The first fold 132 and the tail fold 133 are both bonded to the adhesive segment 134, and the connection between the first fold 132 and the tail fold 133 is achieved through the adhesive segment 134. Since the adhesive segment 134 has a strong bonding effect and the adhesive is not affected by the roughness and pore size of the first fold 132 or the tail fold 133, it can adapt to filter membranes with different roughness and pore sizes, and can always maintain a bonding state with the first fold 132 or the tail fold 133, thereby ensuring the sealing effect of the folded filter element without damaging the filter membrane, and preventing leakage caused by poor penetration effect and weak adhesion effect due to the properties of the filter medium layer 13 itself under high pressure.

[0046] In one embodiment, Figure 4As shown, the bonding point between the first fold 132 and the tail fold 133 also includes a first glue penetration section 135 and a second glue penetration section 136; the first glue penetration section 135 is located on the first fold 132; the connection between the first fold 132 and the adjacent pleat 131 is a first bend; the first glue penetration section 135 is arranged at one end of the first fold 132 away from the first bend, and is consistent with the axial height of the first fold 132; the second glue penetration section 136 is located on the tail fold 133; the connection between the tail fold 133 and the adjacent pleat 131 is a second bend; the second glue penetration section 136 is arranged at one end of the tail fold 133 away from the second bend, and is consistent with the axial height of the tail fold 133; in the thickness direction of the first fold 132 and the tail fold 133, the first glue penetration section 135 and the second glue penetration section 136 are bonded.

[0047] Since the first glue penetration section 135 and the second glue penetration section 136 are bonded, that is, the first fold 132 and the tail fold 133 are directly and tightly connected, the sealing of the bonding between the first fold 132 and the tail fold 133 can be effectively ensured.

[0048] In one embodiment, Figure 5 As shown, the bonding portion between the first fold 132 and the tail fold 133 also includes a first glue penetration section 135 and a second glue penetration section 136; the first glue penetration section 135 is located on the first fold 132, and is formed by the glue penetrating into the interior of the first fold 132 and then solidifying; the connection between the first fold 132 and the adjacent pleat 131 is a first bend; the first glue penetration section 135 is arranged at an end of the first fold 132 away from the first bend, and is consistent with the axial height of the first fold 132; the second glue penetration section 136 is located on the tail fold 133, and is formed by the glue penetrating into the interior of the tail fold 133 and then solidifying; the connection between the tail fold 133 and the adjacent pleat 131 is a second bend; The second glue penetration section 136 is arranged at one end of the tail fold 133 away from the second bend, and is consistent with the axial height of the tail fold 133; in the thickness direction of the first fold 132 and the tail fold 133, there is a gap between the first glue penetration section 135 and the second glue penetration section 136; the adhesive section 134 includes a first adhesive section 1341, the first adhesive section 1341 is located in the gap, and is bonded to the first glue penetration section 135 and the second glue penetration section 136; and in the axial direction of the filter medium layer 13, the first adhesive section 1341 is consistent with the height of the first glue penetration section 135 and the second glue penetration section 136.

[0049] By setting the first adhesive section 1341, it can be ensured that the first glue penetration section 135 and the second glue penetration section 136 are directly bonded to the first adhesive in the thickness direction of the first fold 132 and the tail fold 133, and the first adhesive section 1341 is directly set between the first glue penetration section 135 and the second glue penetration section 136, which can ensure the sealing effect and connection strength at the connection between the first fold 132 and the tail fold 133.

[0050] In one embodiment, the adhesive segment 134 includes a second adhesive segment 1342, which is protrudingly arranged at one end of the first glue penetration segment 135 and the second glue penetration segment 136 away from the first bend or the second bend, and is bonded to both the first glue penetration segment 135 and the second glue penetration segment 136.

[0051] By setting the second adhesive section 1342, it can be ensured that at the end away from the first bend or the second bend, the first glue penetration section 135 and the second glue penetration section 136 are both bonded to the second adhesive section 1342, further ensuring the connection strength and sealing effect between the first fold 132 and the tail fold 133.

[0052] In one embodiment, Figure 4 As shown, in the radial direction of the filter medium layer 13, the lengths of the first fold 132 and the tail fold 133 are consistent, and the ratio of the length of the second adhesive segment 1342 to the length of the first fold 132 is in the range of 0.1-1.1.

[0053] When the ratio of the length of the second adhesive segment 1342 to the length of the first fold 132 is less than 0.1, the length of the second adhesive segment 1342 is too short to ensure that the first fold 132 and the tail fold 133 are completely and tightly connected. At the same time, since pressurization is generally performed during the filtration process, the too short second adhesive segment 1342 is compressed during the pressurization process, and there is a possibility of separation between the first fold 132 and the tail fold 133; when the ratio of the length of the second adhesive segment 1342 to the length of the first fold 132 is greater than 1.1, in the radial direction of the filter medium layer 13, the second adhesive segment 1342 accounts for too large a proportion. At the same time, since the adhesive has a high hardness after molding, the molded filter medium layer 13 may not be able to fit with the filter element housing 11 and the center rod 12, and may even damage the filter medium layer 13, affecting the filtration efficiency.

[0054] In one embodiment, Figure 6As shown, the adhesive segment 134 includes two third adhesive segments 1343. In the axial direction of the filter medium layer 13, the two third adhesive segments 1343 are respectively protruded at the two ends of the first glue penetration segment 135 and the second glue penetration segment 136, and the third adhesive segment 1343 is bonded to both the first glue penetration segment 135 and the second glue penetration segment 136.

[0055] By setting the third adhesive segment 1343, it can be ensured that in the axial direction of the filter medium layer 13, one end of the first glue penetration segment 135 and the second glue penetration segment 136 are both bonded to a third adhesive segment 1343, and the other end is bonded to another third adhesive segment 1343, thereby further ensuring the connection strength and sealing effect between the first fold 132 and the tail fold 133.

[0056] In one embodiment, in the axial direction of the filter medium layer 13 , the lengths of the first fold 132 and the tail fold 133 are consistent, and the height of the third adhesive segment 1343 is less than or equal to 5 mm.

[0057] The height of the third adhesive segment 1343 is controlled below 5 mm, which not only ensures the connection strength and sealing effect between the first fold 132 and the tail fold 133, but also prevents the third adhesive segment 1343 from affecting the connection between the two ends of the filter element body 1 and the end caps, so that the two ends of the filter element body 1 and the end caps can be normally connected.

[0058] In one embodiment, Figure 7 As shown, the adhesive segment 134 includes two fourth adhesive segments 1344 , and the two fourth adhesive segments 1344 are respectively arranged on a side away from the first glue penetration segment 135 and the second glue penetration segment 136 .

[0059] By setting the fourth adhesive segment 1344, the connection strength between the second adhesive segment 1342 and the third adhesive segment 1343 and the first glue penetration segment 135 and the second glue penetration segment 136 can be further strengthened, thereby ensuring the connection strength and sealing effect between the first fold 132 and the tail fold 133.

[0060] Specifically, the adhesive segment 134 includes one or more of a first adhesive segment 1341 , a second adhesive segment 1342 , a third adhesive segment 1343 and a second adhesive segment 1342 .

[0061] In one implementation of this embodiment, Figure 8As shown, the first glue penetration section 135 and the second glue penetration section 136 are tightly bonded, the adhesive section 134 includes the second adhesive section 1342 and two second adhesive sections 1342, and the second adhesive section 1342 and the two fourth adhesive sections 1344 are tightly bonded.

[0062] In another implementation of this embodiment, Fig. 9 As shown, the first glue penetration section 135 and the second glue penetration section 136 are arranged at intervals, the adhesive section 134 includes a first adhesive section 1341, a second adhesive section 1342 and two fourth adhesive sections 1344, and the second adhesive section 1342 is tightly bonded to the first adhesive section 1341 and the two fourth adhesive sections 1344.

[0063] In another implementation of this embodiment, Fig.10 As shown, the adhesive segment 134 includes a second adhesive segment 1342 and two third adhesive segments 1343 , and the second adhesive segment 1342 and the two third adhesive segments 1343 are tightly bonded.

[0064] In one embodiment, in the thickness directions of the first fold 132 and the tail fold 133 , the ratio of the total thickness of the adhesive segment 134 to the sum of the thicknesses of the first fold 132 and the tail fold 133 is less than or equal to 2.

[0065] Since the filter medium layer 13 includes a plurality of pleats 131 formed by folding, if the thickness of the connection between the first fold 132 and the last fold 133 is large, the adhesive segment 134 is likely to contact with the filter medium layer 13 of the adjacent fold, thereby affecting the filtering effect of the filter medium layer 13 of the adjacent fold. Moreover, after the adhesive is cured, the filter medium layer 13 of the adjacent fold is likely to be damaged, thereby posing a risk of leakage.

[0066] In one embodiment, in the radial direction of the filter medium layer 13, the lengths of the first fold 132 and the tail fold 133 are consistent, the lengths of the first glue penetration section 135 and the second glue penetration section 136 are consistent, and the ratio between the length of the first glue penetration section 135 and the length of the first fold 132 is in the range of 0.1-0.9.

[0067] In the radial direction of the filter medium layer 13, the smaller the length of the first glue penetration section 135 and the second glue penetration section 136 is, the larger the effective filtration area of ​​the first fold 132 and the tail fold 133 is. However, due to the poor uniformity of the penetration of the adhesive on the first fold 132 or the tail fold 133, the adhesive distribution of the first glue penetration section 135 and the second glue penetration section 136 is uneven. When the ratio of the length of the first glue penetration section 135 to the length of the first fold 132 is less than 0.1, it is very likely that some areas of the first glue penetration section 135 and the second glue penetration section 136 are not bonded, resulting in the first fold 132 and the tail fold 133 being unevenly distributed. The sealing between the tail fold 133 is poor, and there is a problem of overall filtration failure; when the ratio between the length of the first glue penetration section 135 and the first fold 132 is greater than 0.9, the first fold 132 and the tail fold 133 are penetrated too much by the adhesive, affecting the effective filtration area. At the same time, due to the high hardness of the adhesive after curing, the overall hardness of the first glue penetration section 135 and the second glue penetration section 136 increases. When the radial length of the first glue penetration section 135 or the second glue penetration section 136 is too long, it is very easy to cause damage to the filter medium layer 13 near the first glue penetration section 135 or the second glue penetration section 136.

[0068] In one embodiment, the pleats 131 include pleat peaks 1311, pleat valleys 1312 and connecting legs 1313; the pleat peaks 1311 are located on the side of the filter medium layer 13 close to the filter element housing 11; the pleat valleys 1312 are located on the side of the filter medium layer 13 close to the center rod 12; the connecting legs 1313 are arranged between the pleat peaks 1311 and the pleat valleys 1312, for connecting the pleat peaks 1311 and the pleat valleys 1312; in the radial direction of the filter medium layer 13, the lengths of the first fold 132 and the tail fold 133 are consistent, and the ratio between the length of the first fold 132 and the length of the connecting legs 1313 is in the range of 0.2-0.9.

[0069] When the ratio between the length of the first fold 132 and the length of the connecting leg 1313 is less than 0.2, the length of the first fold 132 or the tail fold 133 is too short, resulting in a shorter length of the first glue penetration section 135 and the second glue penetration section 136, and an effective seal between the first fold 132 and the tail fold 133 cannot be achieved; when the ratio between the length of the first fold 132 and the length of the connecting leg 1313 is greater than 0.9, it is easy for the second adhesive section 1342 to protrude from the outer periphery of the filter medium layer 13, so that the second adhesive section 1342 contacts the filter element housing 11, and it is difficult to install the filter medium layer 13 between the center rod 12 and the filter element housing 11. Therefore, the ratio between the length of the first fold 132 and the length of the connecting leg 1313 is limited to the range of 0.2-0.9, which can not only ensure the sealed connection between the first fold 132 and the tail fold 133, but also facilitate the installation of the filter medium layer 13.

[0070] In a specific embodiment, the filter medium layer 13 includes a support layer and a filter membrane. The support layer supports and protects the filter membrane, thereby enhancing the strength of the filter medium layer 13 and improving the penetration effect of the adhesive, further enhancing the sealing effect between the first fold 132 and the tail fold 133. In one embodiment, the support layer is sleeved on the periphery of the filter membrane. In another embodiment, the filter membrane is sleeved on the periphery of the support layer. Preferably, the support layer can be provided with two layers, and the filter membrane is provided between the two layers of the support layer, thereby enhancing the support effect on the filter membrane.

[0071] Specifically, the ratio of the thickness of the support layer to the thickness of the filter membrane is in the range of 1 to 20. By limiting the ratio of the thickness of the filter membrane to the thickness of the support layer, not only the supporting effect of the support layer on the filter membrane is ensured, but also the overall strength and flux of the filter medium layer 13 can be improved.

[0072] Specifically, the adhesive is any one of epoxy resin, silicone or polyurethane.

[0073] Specifically, the filter membrane includes at least one of a cellulose membrane, a polyethersulfone membrane, a nylon membrane, a polysulfone membrane, a polyamide membrane, a polypropylene membrane, a polyethylene membrane, a polyvinylidene fluoride membrane or a polytetrafluoroethylene membrane.

[0074] Specifically, the support layer is selected from at least one of a screen, a non-woven fabric, and the like.

[0075] In a specific embodiment, the folded filter element further includes an interface end cap 2 and a sealing end cap 3, which are respectively sealed and connected to both ends of the filter element body 1. The filter element body 1 is connected to the interface end cap 2 and the sealing end cap 3 by welding or bonding with an adhesive.

[0076] Specifically, the thickness of the support layer is in the range of 50-300um. By adjusting the thickness of the support layer, the filtering efficiency of the filter membrane can be further guaranteed; under the premise of protecting the filter membrane, the filter medium layer 13 can be better folded and formed, and fixed between the filter element housing 11 and the center rod 12; at the same time, when the adhesive connects the filter element body 1 with the interface end cover 2 and the sealing end cover 3, it is also ensured that the filter medium layer 13 can be completely and evenly fixed.

[0077] According to an embodiment of the present utility model, on the other hand, a filter is provided, comprising the above-mentioned pleated filter element.

[0078] Although the embodiments of the present invention are described in conjunction with 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 are all within the scope defined by the appended claims.

Claims

1. A folded filter element, comprising a filter element body (1), wherein the filter element body (1) comprises a filter element housing (11), a center rod (12) and a filter medium layer (13), wherein the filter medium layer (13) is arranged between the filter element housing (11) and the center rod (12); characterized in that: The filter medium layer (13) comprises a plurality of folds (131) formed by folding, and the axially parallel first fold (132) and tail fold (133) of the filter medium layer (13) are tightly bonded to form an annular structure; The bonding point between the first fold (132) and the tail fold (133) includes an adhesive section (134), and the adhesive section (134) is arranged to protrude from the surface of at least one side of the first fold (132) and the tail fold (133), and is bonded to both the first fold (132) and the tail fold (133).

2. The pleated filter element according to claim 1, characterized in that: The bonding portion between the first fold (132) and the tail fold (133) also includes: A first glue penetration section (135) is located on the first fold (132); the connection between the first fold (132) and the adjacent fold (131) is a first bend; the first glue penetration section (135) is arranged at an end of the first fold (132) away from the first bend, and has the same axial height as the first fold (132); A second glue penetration section (136) is located on the tail fold (133); the connection between the tail fold (133) and the adjacent fold (131) is a second bending point; the second glue penetration section (136) is arranged at an end of the tail fold (133) away from the second bending point, and has the same axial height as the tail fold (133); The first glue penetration section (135) and the second glue penetration section (136) are bonded in the thickness direction of the first fold (132) and the tail fold (133); Alternatively, the bonding portion between the first fold (132) and the tail fold (133) further comprises: A first glue penetration section (135) is located on the first fold (132); the connection between the first fold (132) and the adjacent fold (131) is a first bend; the first glue penetration section (135) is arranged at an end of the first fold (132) away from the first bend, and has the same axial height as the first fold (132); A second glue penetration section (136) is located on the tail fold (133); the connection between the tail fold (133) and the adjacent fold (131) is a second bending point; the second glue penetration section (136) is arranged at an end of the tail fold (133) away from the second bending point, and has the same axial height as the tail fold (133); In the thickness direction of the first fold (132) and the tail fold (133), there is a gap between the first glue penetration section (135) and the second glue penetration section (136); The adhesive segment (134) includes a first adhesive segment (1341), the first adhesive segment (1341) is located in the gap and is bonded to the first glue penetration segment (135) and the second glue penetration segment (136); and in the axial direction of the filter medium layer (13), the first adhesive segment (1341) is at the same height as the first glue penetration segment (135) and the second glue penetration segment (136).

3. The pleated filter element according to claim 2, characterized in that: The adhesive section (134) includes a second adhesive section (1342), wherein the second adhesive section (1342) is protrudingly arranged at one end of the first glue penetration section (135) and the second glue penetration section (136) away from the first bending point or the second bending point, and is bonded to both the first glue penetration section (135) and the second glue penetration section (136).

4. The pleated filter element according to claim 3, characterized in that: In the radial direction of the filter medium layer (13), the lengths of the first fold (132) and the tail fold (133) are consistent, and the ratio of the length of the second adhesive section (1342) to the length of the first fold (132) is in the range of 0.1-1.

1.

5. The pleated filter element according to any one of claims 2 to 4, characterized in that: The adhesive segment (134) includes two third adhesive segments (1343). In the axial direction of the filter medium layer (13), the two third adhesive segments (1343) are respectively protruded at the two ends of the first glue penetration segment (135) and the second glue penetration segment (136), and the third adhesive segment (1343) is bonded to both the first glue penetration segment (135) and the second glue penetration segment (136).

6. The pleated filter element according to claim 5, characterized in that: In the axial direction of the filter medium layer (13), the lengths of the first fold (132) and the tail fold (133) are consistent, and the height of the third adhesive segment (1343) is less than or equal to 5 mm.

7. The pleated filter element according to claim 5, characterized in that: The adhesive section (134) comprises two fourth adhesive sections (1344), and the two fourth adhesive sections (1344) are respectively arranged on a side away from the first glue penetration section (135) and the second glue penetration section (136).

8. The pleated filter element according to claim 7, characterized in that: In the thickness direction of the first fold (132) and the tail fold (133), the ratio of the total thickness of the adhesive segment (134) to the sum of the thickness of the first fold (132) and the tail fold (133) is less than or equal to 2.

9. The pleated filter element according to any one of claims 2 to 4 or 6 to 8, characterized in that: In the radial direction of the filter medium layer (13), the lengths of the first fold (132) and the tail fold (133) are consistent, the lengths of the first glue penetration section (135) and the second glue penetration section (136) are consistent, and the ratio of the length of the first glue penetration section (135) to the length of the first fold (132) is in the range of 0.1-0.9; And / or, the folds (131) include: A pleat peak (1311) is located on a side of the filter medium layer (13) close to the filter element housing (11); A fold valley (1312) is located on a side of the filter medium layer (13) close to the central rod (12); A connecting leg (1313) is arranged between the pleat peak (1311) and the pleat valley (1312) and is used to connect the pleat peak (1311) and the pleat valley (1312); in the radial direction of the filter medium layer (13), the lengths of the first fold (132) and the tail fold (133) are consistent, and the ratio between the length of the first fold (132) and the length of the connecting leg (1313) is in the range of 0.2-0.

9.

10. A filter, characterized in that: A pleated filter element comprising any one of claims 1 to 9.

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