Filter membrane structure convenient to weld and filter element assembly

Abstract

The utility model discloses a filter membrane structure convenient to weld and a filter element assembly, and relates to the technical field of filter elements, the filter membrane structure convenient to weld comprises a filter membrane, lining strips and two supporting layers, the filter membrane is located between the two supporting layers to form a combined filter membrane, and the lining strips are arranged at the two ends of the combined filter membrane. And the lining strip can improve the hardness of the end part of the combined filter membrane and can abut against the end cover of the filter element assembly. The lining strips are arranged at the two ends of the combined filter membrane, so that gaps formed after the combined filter membrane is pleated can be filled, the hardness of the ends of the combined filter membrane is improved, the sealing performance and the connection reliability during welding of the combined filter membrane and the end covers are improved, and the conditions of bypass between the upstream and the downstream of the filter membrane and failure of the filter element are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of filter elements, in particular to a filter membrane structure and a filter element component which are easy to weld. Background Art

[0002] Microporous pleated membrane filter elements, also known as microporous filter elements or pleated membrane filter elements, utilize a composite pleated microporous membrane structure. They achieve nanoscale particle interception through precise surface screening, achieving filtration efficiencies exceeding 99%. They are suitable for liquid and gas filtration in the pharmaceutical, food and beverage, semiconductor, petroleum, and chemical industries. In the semiconductor industry, filtration is a crucial process, playing a significant role in improving chip reliability and yield.

[0003] In actual production, to improve the filtration effect of the filter membrane and increase its strength, filtration area, and liquid flow effect, the filter membrane can be pleated to form a pleated filter membrane. The processing of pleated filter membranes generally includes steps such as pleating, shaping, edge sealing, and end cap welding. However, during the welding process of the pleated filter element and the end cap, the number of pleats of the filter membrane is often insufficient, and the gaps between adjacent pleats of the pleated filter membrane are large. During high-temperature welding, the filter membrane is prone to bending, which cannot guarantee the reliability of the welding and is not conducive to the welding of the pleated filter membrane and the end cap. In addition, it is easy for the filter membrane to bypass the upstream and downstream, causing the filter element to fail. Utility Model Content

[0004] The purpose of the present utility model is to provide a filter membrane structure and filter element assembly that are easy to weld, so as to solve the problems existing in the above-mentioned prior art, make the welding of the pleated filter membrane and the end cover reliable, and avoid the bypass between the upstream and downstream of the filter membrane and the failure of the filter element.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The utility model provides a filter membrane structure that is easy to weld, comprising a filter membrane, a lining strip and two support layers, wherein the filter membrane is located between the two support layers to form a combined filter membrane, and the lining strip is arranged at both ends of the combined filter membrane, and the lining strip can increase the hardness of the end portion of the combined filter membrane and can interfere with the end cover of the filter element assembly.

[0007] Preferably, the material of the lining strip is any one of perfluoroalkoxy vinyl ether copolymer, polytetrafluoroethylene, fluorinated ethylene propylene copolymer, ethylene-chlorotrifluoroethylene copolymer and polyvinylidene fluoride.

[0008] Preferably, the lining strip is provided with at least one layer; the thickness of the single layer of the lining strip is 5 μm to 500 μm.

[0009] Preferably, the width of the lining strip covering the combined filter membrane is 0.3 cm to 5 cm.

[0010] Preferably, the lining strip is inserted into at least one gap between the support layer and the filter membrane.

[0011] Preferably, the lining strip is in an inverted U shape and is wrapped around the outer sides of the two supporting layers.

[0012] Preferably, the filter membrane is made of polytetrafluoroethylene, nylon, polysulfone, polyethylene or polypropylene; the support layer is made of perfluoroalkoxy vinyl ether copolymer, polyethylene or polypropylene.

[0013] The present invention also relates to a filter element assembly that is easy to weld, comprising the above-mentioned filter membrane structure that is easy to weld, a closed end cover, an open end cover, a central tube and an outer shell. The combined filter membrane is pleated to form a cylindrical tube to form a filter element tube. The filter element tube and the outer shell are sequentially sleeved on the outside of the central tube. The two ends of the central tube, the outer shell and the filter element tube are respectively connected to the closed end cover and the open end cover by melting welding.

[0014] Preferably, the central tube and the outer shell are evenly distributed with hollow flow holes.

[0015] Preferably, the outer shell and the central tube have the same length and flush end faces, and both ends of the filter cartridge are respectively 1 mm to 5 mm higher than the outer shell.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] The utility model provides lining strips at both ends of the combined filter membrane to fill the gap after the combined filter membrane is pleated, thereby improving the hardness of the end portion of the combined filter membrane, which is beneficial to improving the sealing and connection reliability when welding the combined filter membrane and the end cover, and avoiding bypass between the upstream and downstream of the filter membrane and filter element failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of a filter membrane structure that is easy to weld in Example 1 of the present utility model;

[0020] Figure 2 This is a schematic structural diagram of a filter membrane structure that is easy to weld in Example 2 of the present utility model;

[0021] Figure 3This is a schematic structural diagram of a filter element assembly that is easy to weld in Example 3 of the present utility model;

[0022] Figure 4 This is a schematic top view of the structure of the first filter cartridge in the third embodiment of the present utility model;

[0023] Figure 5 This is a schematic top view of the structure of the second filter cartridge in the third embodiment of the present utility model;

[0024] In the figure: 1-filter membrane, 2-support layer, 3-lining strip, 4-filter element tube, 5-center tube, 6-housing, 7-closed end cover, 8-open end cover. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "inside", "outside", "front", "back", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third" and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0027] In addition, it should be noted that in the description of this utility model, unless otherwise specified or limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; they can refer to mechanical connection or electrical connection; they can refer to direct connection or indirect connection through an intermediate medium; and they can refer to internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] The purpose of the utility model is to provide a filter membrane structure and filter element assembly that are easy to weld, so as to solve the problems existing in the prior art, make the welding of the pleated filter membrane and the end cover reliable, and avoid the bypass between the upstream and downstream of the filter membrane and the failure of the filter element.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment provides a filter membrane structure that is easy to weld, including a filter membrane 1, a lining strip 3 and two support layers 2. The filter membrane 1 is located in the middle of the two support layers 2 to form a combined filter membrane. The lining strip 3 is arranged at both ends of the combined filter membrane, and the lining strip 3 can increase the hardness of the end of the combined filter membrane and can conflict with the end cover of the filter element assembly. Without affecting the subsequent pleating treatment of the combined filter membrane, the hardness of the end of the combined filter membrane can be effectively improved, which is beneficial to improving the sealing and connection reliability when welding with the end cover.

[0032] As an optional solution, the material of the backing strip 3 in this embodiment can be any of perfluoroalkoxy vinyl ether copolymer (PFA), polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), ethylene-chlorotrifluoroethylene copolymer (ECTFE), and polyvinylidene fluoride (PVDF), as long as it is a fluorine-containing material with a certain hardness. Part of the backing strip 3 has a lower melting point than PTFE, which can seal the edge of the filter membrane 1 during melt welding, improving welding reliability, avoiding upstream and downstream bypass, and improving the weld yield of the melted product.

[0033] As an optional solution, in this embodiment, the lining strip 3 is provided with at least one layer; the thickness of the single-layer lining strip 3 is 5μm~500μm, which is not particularly large. Under the premise of not affecting the subsequent pleating treatment of the combined filter membrane, it can effectively improve the hardness of the end of the combined filter membrane, and avoid the combined filter membrane from bending when it is melt-welded and inserted into the end cover, causing bypass between the upstream and downstream of the filter membrane 1 and filter element failure.

[0034] As an optional solution, in this embodiment, the width of the backing strip 3 covering the combined filter membrane is 0.3 cm to 5 cm. The large-band-shaped backing strip 3 can enhance the overall rigidity of the pleated filter membrane edge, making it easier to insert the combined filter membrane into the end caps during welding and improving the reliability of the fusion welding.

[0035] As an optional solution, in this embodiment, a lining strip 3 is inserted into at least one gap between the support layer 2 and the filter membrane. The lining strip 3 relies on the plasticity and mutual friction between the support layer 2 and the filter membrane to maintain stability at both ends of the combined filter membrane after pleating. Two lining strips 3 are located at the upper and lower ends of the filter membrane 1, and the width of the inserted lining strip on the filter membrane 1 is preferably 2.5 cm.

[0036] As an optional solution, in this embodiment, the material of the filter membrane 1 is a polymer material such as polytetrafluoroethylene (PTFE), nylon, polysulfone, polyethylene, polypropylene, etc.; the material of the support layer 2 is a material such as perfluoroalkoxy vinyl ether copolymer (PFA), polyethylene or polypropylene, etc.

[0037] In this embodiment, by arranging lining strips 3 at both ends of the combined filter membrane, the gap after the combined filter membrane is pleated can be filled, the gap can be reduced, and the hardness of the ends of the combined filter membrane at the gap can be improved; the lining strips 3 make the two ends of the combined filter membrane have a certain hardness, which can enhance the overall firmness of the edge of the pleated filter membrane, and is more conducive to the insertion of the end caps at both ends of the combined filter membrane during melt welding, thereby improving the reliability of melt welding.

[0038] Example 2

[0039] like Figure 2 As shown, the difference from Example 1 is that the lining strip 3 is in an inverted U-shape and is wrapped around the outside of the two supporting layers 2 to form a package opening, which is equivalent to adding two layers of lining strips 3, so that the hardness of the two ends of the combined filter membrane is better, and the inner advance of the wrapped lining strip along the edge of the filter membrane 1 can be 2 cm.

[0040] Example 3

[0041] like Figures 3 to 5 As shown, this embodiment provides a filter element assembly that is easy to weld, including the filter membrane structure that is easy to weld in the above-mentioned embodiment 1, the closed end cap 7, the open end cap 8, the center tube 5 and the outer shell 6. The combined filter membrane is pleated to form a cylindrical tube to form a filter element tube 4. The filter element tube 4 and the outer shell 6 are sequentially sleeved on the outside of the center tube 5. The two ends of the center tube 5, the outer shell 6 and the filter element tube 4 are respectively connected to the closed end cap 7 and the open end cap 8 by melt welding. Among them, the combined filter membrane can be provided with at least one layer, usually one or two layers; the upper and lower end caps can be provided with a plug-in groove for the filter element tube 4, or there can be no plug-in groove plane; the outer shell 6 and the center tube 5, as well as the filter element tube 4 and the two end caps are all melt welded, which can ensure the firmness of the filter element assembly structure and effectively protect the filter element tube 4.

[0042] As an optional solution, in this embodiment, hollow flow holes are evenly distributed on the central tube 5 and the outer shell 6 to facilitate the flow of air or liquid through the filter core tube 4.

[0043] As an optional solution, in this embodiment, the outer shell 6 and the center tube 5 have the same length and the end faces are flush. Preferably, the two ends of the filter cartridge 4 are respectively 1mm to 5mm higher than the outer shell, and the filter cartridge 4 can also be flush with the end of the outer shell 6.

[0044] In this embodiment, by arranging lining strips 3 at both ends of the combined filter membrane, the gaps after the combined filter membrane is pleated can be filled, the gaps can be reduced, and the hardness of the ends of the combined filter membrane with gaps can be increased, which is beneficial for fusion welding with the end caps.

[0045] Throughout this specification, references to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "this embodiment," "specific examples," or "some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A filter membrane structure that is easy to weld, characterized in that: It includes a filter membrane, a lining strip and two support layers. The filter membrane is located in the middle of the two support layers to form a combined filter membrane. The lining strip is arranged at both ends of the combined filter membrane, and the lining strip can increase the hardness of the end of the combined filter membrane and can conflict with the end cover of the filter element assembly; the lining strip is provided with at least one layer.

2. The filter membrane structure that is easy to weld according to claim 1, characterized in that: The material of the lining strip is any one of perfluoroalkoxy vinyl ether copolymer, polytetrafluoroethylene, fluorinated ethylene propylene copolymer, ethylene-chlorotrifluoroethylene copolymer and polyvinylidene fluoride.

3. The filter membrane structure that is easy to weld according to claim 1, characterized in that: The thickness of the single-layer lining strip is 5 μm to 500 μm.

4. The filter membrane structure that is easy to weld according to claim 1, characterized in that: The width of the lining strip covering the combined filter membrane is 0.3 cm to 5 cm.

5. The filter membrane structure that is easy to weld according to claim 1, characterized in that: The lining strip is inserted into at least one gap between the support layer and the filter membrane.

6. The filter membrane structure that is easy to weld according to claim 1, characterized in that: The lining strip is in an inverted U shape and covers the outer sides of the two supporting layers.

7. The filter membrane structure that is easy to weld according to claim 1, characterized in that: The material of the filter membrane is polytetrafluoroethylene, nylon, polysulfone, polyethylene or polypropylene; the material of the support layer is perfluoroalkoxy vinyl ether copolymer, polyethylene or polypropylene.

8. A filter element assembly that is easy to weld, characterized by: It comprises the filter membrane structure that is easy to weld, the closed end cover, the open end cover, the central tube and the outer shell as described in any one of claims 1 to 7, the combined filter membrane is pleated to form a cylindrical tube to form a filter element tube, the filter element tube and the outer shell are sequentially sleeved on the outside of the central tube, and the two ends of the central tube, the outer shell and the filter element tube are respectively connected to the closed end cover and the open end cover by melting welding.

9. The filter element assembly convenient for welding according to claim 8, characterized in that: The central tube and the outer shell are both evenly distributed with hollow flow holes.

10. The filter element assembly convenient for welding according to claim 8, characterized in that: The outer shell and the central tube have the same length and flush end faces, and both ends of the filter cartridge are respectively 1 mm to 5 mm higher than the outer shell.

Images