High-strength folding filter element and filter

Abstract

The utility model discloses a high-strength folding filter element, which comprises a filter element body and end covers respectively arranged at two ends of the filter element body, the filter element body comprises a central rod, a filter medium layer and a filter element shell which are sequentially arranged from inside to outside, and the filter medium layer is folded around the central rod to form folds. The filtering medium layer comprises a film layer and a supporting layer, reinforcing pieces are arranged at the two ends of the filtering medium layer in the axial direction of the center rod respectively, and the reinforcing pieces are located at the two axial ends of the upstream side and / or the downstream side of the filtering medium layer. The utility model aims to reduce the bending deformation of the filter medium layer due to pressure in the process of approaching to the end cover through the arrangement of the reinforcer, and solve the problem that the filter medium layer is obviously bent and even broken in the connecting process.

Description

Technical Field

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

[0002] The pleated filter element is also called a pleated filter element. It has high filtration accuracy and flow rate, can effectively intercept tiny particles and colloidal debris, and has extremely high filtration efficiency. This filter element has a wide range of applications, a large membrane filtration area, a large dirt holding capacity, and a long service life. Overall, this filter element meets the filtration requirements of food and beverage processing, chemical, pharmaceutical and other industries, and is an indispensable component in the fluid processing process.

[0003] The existing pleated filter element is connected to the end cap after assembly. During the connection process with the end cap, the end face of the folded filter medium layer is easily affected by the force exerted by the end cap, causing the filter medium layer to bend or even fold. This will not only directly damage the filter medium layer, but may even cause incomplete sealing between the end face of the filter medium layer and the end cap, thereby completely failing the filtering ability of the filter. Utility Model Content

[0004] The utility model provides a high-strength folded filter element and filter, which reduces the bending deformation of the filter medium layer due to pressure in the process of approaching the end cover by setting a reinforcement piece, and solves the problem that the filter medium layer may be significantly bent or even broken during the connection process.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A high-strength pleated filter element, comprising a filter element body and end caps respectively arranged at both ends of the filter element body, the filter element body comprising a central rod, a filter medium layer and a filter element housing arranged in sequence from the inside to the outside, the filter medium layer folded around the central rod to form pleats, the filter medium layer comprising a membrane layer and a support layer, the filter medium layer is provided with reinforcements at both ends of the axial direction of the central rod, and the reinforcements are located at both ends of the axial direction of the upstream side and / or the downstream side of the filter medium layer. The upstream side of the filter medium layer refers to the direction close to the liquid inlet surface of the filter membrane, and the downstream side refers to the direction close to the liquid outlet surface of the filter membrane. When the filter medium layer including the reinforcement is connected to the end cap, the reinforcement can effectively improve the strength of the end of the filter medium layer, and reduce the possibility of bending and deformation of the filter medium layer after being subjected to the pressure of the end cap; at the same time, since the reinforcement is arranged at the end of the filter medium layer, the filter area thickness of the filter medium layer will not be increased, and the filter medium layer can maintain the original number of pleats and the flow space of the feed liquid, thereby ensuring the effective filtering area of ​​the filter.

[0007] Preferably, the reinforcement is aligned with both ends of the filter medium layer along the axis of the center rod, and the reinforcement and the filter medium layer have the same length around the center rod. In this way, the reinforcement can cover the edge of the filter medium layer, and after the filter medium layer is pleated, the support layer, the membrane layer and the reinforcement exist in one circle in the circumferential direction, and the reinforcement can provide the best protection for the membrane layer.

[0008] Preferably, the axial width of the reinforcement is 1-10 mm. The axial width of the reinforcement refers to the axial width of the remaining area after the reinforcement is welded to the end cover or the axial width of the area not covered by the glue after the reinforcement is sealed with the end cover. The reinforcement has a suitable axial width so that its bending resistance can be fully exerted and the effective filtering area can be guaranteed to the greatest extent.

[0009] Preferably, the thickness of the reinforcement is 20-200 μm. The overall thickness of the filter medium layer composed of reinforcements within this thickness range is appropriate, ensuring the sealing of the pleated filter element formed subsequently.

[0010] Preferably, the reinforcement has reinforcement holes, and the reinforcement holes are randomly distributed on the surface of the reinforcement. During the filtration process, the feed liquid can flow normally through the reinforcement holes, and the reinforcement will not affect the effective filtration area.

[0011] Preferably, the elastic modulus of the reinforcement is greater than or equal to 100 MPa. In this way, the reinforcement has a strong bending resistance, and during the connection process between the filter medium layer and the end cover, the reinforcement can ensure that the filter medium layer always remains upright and can effectively protect the filter medium layer.

[0012] Preferably, the reinforcement member is any one of HDPE reinforcement member, PE reinforcement member and PET reinforcement member. HDPE (high-density polyethylene), PE (polyethylene) and PET (polyethylene terephthalate) are materials with high strength, especially high bending resistance, and can effectively prevent the filter medium layer from obvious bending deformation.

[0013] Preferably, the support layer is provided on the upstream side and the downstream side of the membrane layer, respectively, and the height of the support layer along the axial direction of the central rod is flush with the membrane layer. The support layer provided on the upstream side of the membrane layer can effectively reduce the interception amount borne by the membrane layer, and reduce the friction between the membrane layer and the filter element housing, thereby protecting the membrane layer; the support layer provided on the downstream side of the membrane layer can separate the membrane layer from the central rod, and reduce the possibility of deformation of the membrane layer during the filtration process. At the same time, the membrane layer is not in direct contact with the reinforcement, so as to avoid damage to the filter membrane caused by the reinforcement.

[0014] Preferably, the support layer is made of any one of non-woven fabrics or screens, and the gram weight of the non-woven fabrics or screens is 10-30 g / m2. The non-woven fabrics or screens within this gram weight range can play a certain supporting role without compressing the space of the membrane layer.

[0015] Preferably, the membrane layer includes at least one filter membrane, and the filter membrane is any one of a polypropylene filter membrane, a polyethersulfone filter membrane, a polyvinylidene fluoride filter membrane, a polytetrafluoroethylene filter membrane, a nylon filter membrane, and a regenerated cellulose membrane.

[0016] Preferably, the connection between the filter element body and the end cover is made by welding or adhesive bonding.

[0017] A filter comprises the high-strength pleated filter element.

[0018] The beneficial effects of the utility model are: (1) by arranging a reinforcement member in the filter medium layer, the strength of the end of the filter medium layer is improved, and the filter medium layer is effectively prevented from being significantly bent or even broken during the connection process, thereby achieving a good protective effect; (2) the arrangement of the reinforcement member can give full play to its bending resistance and can also maximize the effective filtering area of ​​the filter; (3) the arrangement of the support layer in the filter medium layer reduces the interception amount borne by the filter membrane, thereby reducing the number of filter membranes required and saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the folded filter element of Example 1 of the utility model;

[0021] Figure 3 is a cross-sectional view of the filter medium layer of Example 1 of the utility model;

[0022] Figure 4 It is an expanded view of the filter medium layer of Example 1 of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the reinforcement member of the utility model;

[0024] Figure 6 It is a structural schematic diagram of the filter of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the folded filter element of Example 2 of the utility model;

[0026] Figure 8 This is a schematic diagram of the structure of the folded filter element of Example 3 of the utility model;

[0027] Fig. 9 This is a schematic diagram of the structure of the folded filter element of Example 4 of the utility model;

[0028] Fig.10 It is a structural schematic diagram of the folded filter element in Example 5 of the utility model.

[0029] In the figure: high-strength pleated filter element 1, filter element body 10, filter medium layer 11, support layer 11a, membrane layer 11b, reinforcement 111, upstream reinforcement 111a, downstream reinforcement 111b, reinforcement through hole 1101, filter element housing 12, housing through hole 12a, center rod 13, center rod through hole 13a, end cover 14, and outer shell 2. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Example 1

[0032] like Figure 1 , Figure 2 In the embodiment shown, a high-strength folded filter element includes a filter element body 10, and corresponding end caps 14 are respectively provided at both ends of the filter element body 10. The filter element body 10 includes a center rod 13, a filter medium layer 11 and a filter element housing 12 arranged in sequence from the inside to the outside. The surface of the filter element housing 12 is provided with a housing through hole 12a, and the surface of the center rod 13 is provided with a center rod through hole 13a to facilitate the flow of the feed liquid during the filtration process. The connection between the filter element body 10 and the end cap 14 is any one of a welding connection and an adhesive bonding connection.

[0033] Combination Figure 3 , Figure 4 As shown, the filter medium layer 11 is folded around the center rod 13 to form folds, and the filter medium layer 11 includes a membrane layer 11b and a support layer 11a, wherein the membrane layer 11b includes a filter membrane, and the filter membrane is any one of a polypropylene filter membrane, a polyethersulfone filter membrane, a polyvinylidene fluoride filter membrane, a polytetrafluoroethylene filter membrane, a nylon filter membrane, and a regenerated cellulose membrane. The upstream side and the downstream side of the membrane layer 11b are respectively provided with support layers 11a, and the height of the support layer 11a along the axial direction of the center rod 13 is flush with the membrane layer 11b. The support layer 11a located on the upstream side of the membrane layer 11b can reduce the interception amount borne by the filter membrane, reduce the friction between the membrane layer 11b and the housing 2, and protect the membrane layer 11b from damage. The support layer 11a is arranged on the downstream side of the membrane layer 11b, which can separate the membrane layer 11b from the center rod 13, form a flow space for the feed liquid, and reduce the possibility of deformation of the membrane layer 11b during the filtration process. The support layer 11a is made of any one of non-woven fabrics or screens, and the gram weight of the non-woven fabric or the screen is 10-30 grams per square meter. The non-woven fabric or the screen can play a certain supporting role and will not compress the space of the filter membrane.

[0034] like Figure 2 As shown, the filter medium layer 11 is provided with reinforcement pieces 111 at both ends of the central rod 13 in the axial direction. Figure 3 , Figure 4 As shown, the reinforcement 111 is located at the most upstream layer of the filter medium layer 11, and the reinforcement 111 is aligned with both ends of the filter medium layer 11 along the axial direction of the center rod 13. The reinforcement 111 can cover the edge of the filter medium layer 11, and can maximize its bending resistance to avoid bending and deformation of the entire filter medium layer 11. The reinforcement 111 and the filter medium layer 11 have the same length around the center rod 13. After the filter medium layer 11 is pleated, the support layer 11a, the membrane layer 11b and the reinforcement 111 exist in one circle in the circumferential direction, thereby ensuring the protective effect of the reinforcement 111.

[0035] The reinforcement 111 is made of one of HDPE reinforcement, PE reinforcement, and PET reinforcement. The reinforcement 111 made of the above polymer films has a strong material strength, especially strong bending resistance. When the filter medium layer 11 is subjected to pressure from the end cap 14 during the connection process with the end cap 14, it can ensure that the filter medium layer 11 will not be significantly bent or deformed. The elastic modulus of the reinforcement 111 is greater than or equal to 100MPa. The reinforcement 111 can ensure that the filter medium layer 11 always remains upright, thereby effectively protecting the filter medium layer 11. The thickness of the reinforcement 111 is 20-200um. When the thickness of the reinforcement 111 is less than 20um, the reinforcement effect is not obvious, and the filter medium layer 11 still has a certain risk of bending and deformation; when the thickness of the reinforcement 111 is greater than 200um, the end of the filter medium layer 11 formed will be too thick, which is not conducive to the subsequent connection with the end cap 14, affecting the sealing of the filter element. The overall thickness of the filter medium layer 11 composed of the reinforcement member 111 with a thickness in the range of 20-200 μm is appropriate, which ensures the sealing of the filter element formed later. Figure 5 As shown, the reinforcement member 111 has reinforcement member through holes 1101 , and the reinforcement member through holes 1101 are randomly distributed on the surface of the reinforcement member 111 . The feed liquid can flow normally through the reinforcement member through holes 1101 , and will not affect the effective filtering area.

[0036] like Figure 2As shown, the axial width a of the reinforcement 111 is 1-10mm. The axial width of the reinforcement refers to the axial width of the remaining area after the reinforcement 111 is welded to the end cap 14 or the axial width of the area not covered by the glue after the reinforcement 111 and the end cap 14 are glue-sealed. The appropriate axial width can enable the polymer membrane to exert its bending resistance and can also maximize the effective filtering area of ​​the filter. When the axial width of the reinforcement 111 is less than 1mm, the reinforcement effect of the reinforcement 111 is insufficient; when the axial width of the reinforcement 111 is greater than 10mm, the excessive width will occupy the area of ​​the filter membrane, reduce its filtering area, and increase the overall thickness of the filter medium layer 11. The width b of the reinforcement 111 before the filter medium layer 11 is connected to the end cap 14 is 3-12mm. In this way, the reinforcement 111 can be completely connected to the end cap 14 during the connection process to ensure the overall sealing of the filter element.

[0037] A filter such as Figure 6 As shown, the filter comprises a housing 2 and a high-strength folded filter element 1 arranged inside the housing 2. The housing 2 is provided with a liquid inlet, a liquid outlet and a reflux port to facilitate the flow of filtered liquid inside and outside and to discharge excess gas inside the filter.

[0038] Example 2

[0039] The difference between Example 2 and Example 1 is that Figure 7 As shown, the membrane layer 11b includes two layers of filter membranes, which are any one of polypropylene filter membrane, polyethersulfone filter membrane, polyvinylidene fluoride filter membrane, polytetrafluoroethylene filter membrane, nylon filter membrane, and regenerated cellulose membrane. The combination of filter membranes provides a greater interception amount and achieves a stronger filtering effect.

[0040] Example 3

[0041] The difference between Example 3 and Example 1 is that Figure 8 As shown, the reinforcement includes an upstream reinforcement 111a and a downstream reinforcement 111b, wherein the upstream reinforcement 111a is arranged on the most upstream side of the filter medium layer 11, and the downstream reinforcement 111b is arranged on the most downstream side of the filter medium layer 11. The upstream reinforcement 111a and the downstream reinforcement 111b cooperate to further improve the strength of the filter medium layer 11, and the downstream reinforcement 111b also allows a certain buffer space to exist between the filtered liquid and the center rod 13, thereby extending the overall service life of the filter element.

[0042] Example 4

[0043] The difference between Example 4 and Example 3 is that Fig. 9As shown, the membrane layer 11b includes two layers of filter membranes, which are any one of polypropylene filter membrane, polyethersulfone filter membrane, polyvinylidene fluoride filter membrane, polytetrafluoroethylene filter membrane, nylon filter membrane, and regenerated cellulose membrane. The combination of filter membranes provides a greater interception amount and achieves a stronger filtering effect.

[0044] Example 5

[0045] The difference between Example 5 and Example 1 is that Fig.10 As shown, the reinforcement 111 is disposed at the most downstream side of the filter medium layer 11, which can further increase the strength of the filter medium layer 11 and at the same time provide a certain buffer space between the filtered liquid and the center rod 13, thereby extending the service life of the entire filter element.

[0046] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A high-strength pleated filter element, comprising a filter element body (10) and end caps (14) respectively arranged at both ends of the filter element body (10), wherein the filter element body (10) comprises a center rod (13), a filter medium layer (11) and a filter element housing (12) arranged in sequence from the inside to the outside, and the filter medium layer (11) is folded around the center rod (13) to form pleats, wherein: The filter medium layer (11) comprises a membrane layer (11b) and a support layer (11a), and reinforcement members (111) are respectively provided at two axial ends of the filter medium layer (11) along the central rod (13), and the reinforcement members (111) are located at two axial ends of the upstream side and / or the downstream side of the filter medium layer (11).

2. A high-strength folded filter element according to claim 1, characterized in that: The reinforcing member (111) and the filter medium layer (11) are aligned at both ends along the axis of the central rod (13); the reinforcing member (111) and the filter medium layer (11) have the same length in the direction around the central rod (13).

3. A high-strength folded filter element according to claim 1 or 2, characterized in that: The axial width of the reinforcement member (111) is 1-10 mm.

4. A high-strength folded filter element according to claim 3, characterized in that: The thickness of the reinforcement member (111) is 20-200 um.

5. The high-strength folded filter element according to claim 1, characterized in that: The reinforcement member (111) is provided with reinforcement member through holes (1101), and the reinforcement member through holes (1101) are randomly distributed on the surface of the reinforcement member (111).

6. A high-strength pleated filter element according to claim 1, characterized in that: The elastic modulus of the reinforcement (111) is greater than or equal to 100 MPa.

7. The high-strength folded filter element according to claim 1, characterized in that: The reinforcement member (111) is any one of a HDPE reinforcement member, a PE reinforcement member, and a PET reinforcement member.

8. The high-strength pleated filter element according to claim 1, characterized in that: The support layer (11a) is provided on the upstream side and the downstream side of the membrane layer (11b), respectively. The height of the support layer (11a) along the axial direction of the central rod (13) is flush with the membrane layer (11b).

9. The high-strength pleated filter element according to claim 1, characterized in that: The support layer (11a) is made of any one of non-woven fabrics and screens, and the gram weight of the non-woven fabric or the screen is 10-30 grams per square meter.

10. The high-strength pleated filter element according to claim 1, characterized in that: The membrane layer (11b) comprises at least one filter membrane, and the filter membrane is any one of a polypropylene filter membrane, a polyethersulfone filter membrane, a polyvinylidene fluoride filter membrane, a polytetrafluoroethylene filter membrane, a nylon filter membrane, and a regenerated cellulose membrane.

11. The high-strength pleated filter element according to claim 1, characterized in that: The connection between the filter element body (10) and the end cover (14) is achieved by welding or adhesive bonding.

12. A filter, characterized in that: The filter comprises the high-strength pleated filter element as described in any one of claims 1-11.

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