A wound filter cartridge

Abstract

The utility model provides a kind of winding filter element, including center framework, center framework is cylindrical structure, the inside of center framework has water cavity, the side surface of center framework is equipped with multiple through holes with water cavity, the outside of center framework is wrapped with filter main body, filter main body is cylindrical hollow structure, filter main body is composed of winding film wound on the outer surface of center framework, winding film includes first film layer and second film layer superimposed together, first film layer has first surface and second surface, first surface and second surface are opposite, second film layer covers superimposed in the first surface of first film layer, first film layer is polypropylene filter membrane, and second film layer is sterilization filter paper.

Description

Technical Field

[0001] This utility model relates to the field of filter elements, and in particular to a wound filter element. Background Technology

[0002] In drinking water treatment, ultrafiltration technology is generally used to remove bacteria. Ultrafiltration membrane filtration is a pressure-driven technology that relies on pore size interception. However, ultrafiltration membrane filtration has drawbacks such as high energy consumption and limited functionality. To remove residual chlorine and other impurities from water, activated carbon technology is generally used. However, the carbon rods used in existing activated carbon technologies are composed of binders and carbon powder. The binders in the carbon rods significantly reduce the performance of the activated carbon, resulting in poor effectiveness in removing residual chlorine.

[0003] Currently, some new solutions have emerged that can better address the shortcomings of ultrafiltration membrane filtration and activated carbon. For example, Auslon's Disruptor is a water treatment filtration solution that uses pleated filter paper to make pleated filter cartridges. Although the filtration precision of this pleated filter cartridge can reach the ultrafiltration level, the sterilization filter paper of Auslon's Disruptor has high stiffness and can only be used to make pleated filter cartridges to achieve a good filtration effect. Its manufacturing process is relatively complex, and poor control of the pleating process can easily lead to damage to the filter paper and reduce filtration efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide a wound filter element.

[0005] To solve the above-mentioned technical problems, this utility model provides a wound filter element, including a central skeleton, which is a cylindrical structure. The interior of the central skeleton has a water-passing cavity, and the sides of the central skeleton have multiple through holes communicating with the water-passing cavity. The outer side of the central skeleton is wrapped with a filter body, which is a cylindrical hollow structure. The filter body is composed of a wound membrane wrapped around the outer surface of the central skeleton. The wound membrane includes a first membrane layer and a second membrane layer stacked together. The first membrane layer has a first surface and a second surface, with the first surface and the second surface facing away from each other. The second membrane layer covers and is stacked on the first surface of the first membrane layer. The first membrane layer is a polypropylene filter membrane, and the second membrane layer is a sterilizing filter paper.

[0006] Preferably, the first membrane layer has a first region at the starting end of winding, a second region at the ending end of winding, a middle section of the first membrane layer as a coating region, and a second membrane layer covering and overlapping the coating region of the first membrane layer to form a filter stack.

[0007] Preferably, the wound membrane is wound sequentially from the inside to the outside on the central skeleton to form an inner ring layer, a middle ring layer and an outer ring layer. The inner ring layer is wound from the first membrane layer in the first region, the middle ring layer is wound from the filter stack, and the outer ring layer is wound from the first membrane layer in the second region.

[0008] Preferably, the number of winding turns of the film in both the inner ring layer and the outer ring layer is greater than 5 layers, the middle ring layer is a stack of polypropylene filter membrane and sterilizing filter paper, and the number of winding turns of the film in the middle ring layer is greater than 1 layer.

[0009] Preferably, the filtration pore size of the polypropylene filter membrane is 10 micrometers.

[0010] Preferably, the antibacterial filter paper is made of positively charged fibers.

[0011] Preferably, the antibacterial filter paper is made of positively charged fibers, bicomponent bonding fibers, activated carbon fibers, and antibacterial materials.

[0012] Preferably, the positively charged fiber is made from cellulose fiber that has been pulped and modified to a pulping degree greater than 50°SR, wherein the cellulose fiber is natural cellulose fiber or regenerated cellulose fiber.

[0013] Preferably, the bicomponent bonding fiber is a PP-PE or PET-PET core-sheath structure fiber, the fiber length of the bicomponent bonding fiber is 3-6 mm, and the sheath melting point of the bicomponent bonding fiber is 100-130℃.

[0014] Preferably, the activated carbon fiber is prepared by pulping with a pulping degree of less than 50°SR, and the antibacterial material is nano-silver antibacterial powder encapsulated in glass microspheres, with a particle size range of 20-60 micrometers.

[0015] The beneficial effects of this utility model are as follows: The filter element of this utility model is a wound membrane filter element, which has a low material cost per unit. Moreover, the manufacturing process of the filter element is a simple winding process. In use, the water to be treated before filtration enters from the outer ring layer of PP filter membrane, and then passes through the sterilization filter paper layer and the inner ring layer of PP filter membrane in sequence, before entering the water passage cavity of the central tube through the through holes on the central skeleton. The positively charged fibers of the wound membrane on the filter element can adsorb bacteria with negative charges on their surface. The antibacterial components in the filter paper also play a role in inhibiting bacterial growth or contact sterilization, avoiding the growth of bacteria in the filter paper and affecting the effect, thereby achieving the purpose of removing bacteria. It can achieve good filtration effect while keeping the product production cost low. Attached Figure Description

[0016] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this invention.

[0017] Figure 1 This is a schematic diagram of the winding structure of the wound film and the central skeleton according to a preferred embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the winding structure of the wound film and the central skeleton according to a preferred embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional schematic diagram of a wound filter element according to a preferred embodiment of the present invention;

[0020] In the figure: central skeleton 1; water passage cavity 100; through hole 101; first membrane layer 21; second membrane layer 22;

[0021] Inner ring layer 301; middle ring layer 302; outer ring layer 303. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0023] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] refer to Figures 1-3This utility model provides a wound filter element, including a central frame 1, which is a cylindrical structure. The interior of the central frame 1 has a water-passing cavity 100. The side of the central frame 1 has a plurality of through holes 101 that communicate with the water-passing cavity 100. The outer side of the central frame 1 is wrapped with a filter body, which is a cylindrical hollow structure. The filter body is composed of a wound membrane wrapped around the outer surface of the side of the central frame 1. The wound membrane is wound around the position of the through holes 101 on the side of the central frame 1. The wound membrane includes a first membrane layer 21 and a second membrane layer 22 stacked together. The first membrane layer 21 has a first surface and a second surface, which are opposite to each other. The second membrane layer 22 covers the first surface of the first membrane layer 21. The first membrane layer 21 is a polypropylene filter membrane, and the second membrane layer 22 is a sterilizing filter paper. When the wound membrane is wound onto the central frame 1, the first surface of the first membrane layer 21 faces the surface of the central frame 1. That is, the first surface of the first membrane layer 21 is the inner side of the wound membrane, and the second surface of the first membrane layer 21 is the outer side of the wound membrane. The wound filter element of this application, through the multi-layer winding of the wound membrane, achieves a large filtration area per unit volume and a large filtration flow rate; at the same time, it can both remove bacteria and particles, achieving a better filtration effect.

[0026] In a preferred embodiment, the central frame 1 is a central tube, and the wound filter element is composed of a wound membrane and a central tube. A through hole 101 is provided on the side of the central tube so that water can enter the central tube through the through hole 101 on the side of the central tube. The wound membrane is composed of a PP filter membrane and a sterile filter paper that is covered and stacked in the middle section of the PP filter membrane, so that the starting end and the ending end of the winding of the wound membrane are both PP filter membranes, and the middle section of the wound membrane is a stack of PP filter membrane and sterile filter paper.

[0027] During winding, the PP filter membrane is first wound onto the central tube, with at least 5 layers to form the inner ring layer. This inner ring layer supports the sterilizing filter paper and provides security filtration, preventing filter paper fibers from detaching and entering the water. Next, the overlapping layers of the PP filter membrane and sterilizing filter paper are wound onto the outer surface of the inner ring layer, with at least one layer wound. The starting and ending edges of the sterilizing filter paper are aligned circumferentially. The middle ring layer contains the sterilizing filter paper and serves to remove bacteria, organic matter, and residual chlorine. Finally, the remaining PP filter membrane from the end of the winding is wound onto the outer surface of the middle ring layer, with at least 5 layers wound. This results in a filter element with a PP filter membrane outer layer and an outer ring layer providing primary filtration.

[0028] refer to Figure 1 and Figure 2In a preferred embodiment, the first membrane layer 21 has a first region at the winding start end and a second region at the winding end end. The first surface of the first membrane layer, excluding the first and second regions, is a membrane-covered region. The second membrane layer 22 covers and overlaps the membrane-covered region of the first membrane layer 21 to form a filter stack. The filter stack is a stack of polypropylene filter membrane and antibacterial filter paper.

[0029] refer to Figure 3 In a preferred embodiment, the winding membrane is wound sequentially from the inside to the outside on the central frame 1 to obtain an inner ring layer 301, a middle ring layer 302 and an outer ring layer 303. The inner ring layer 301 is wound from the first membrane layer of the first region, the middle ring layer 302 is wound from the filter stack, and the outer ring layer 303 is wound from the first membrane layer of the second region. Figure 3 In the diagram, the direction indicated by the dashed arrow is the winding direction of the film on the central frame 1.

[0030] In a preferred embodiment, the inner ring layer 301 and the outer ring layer 303 each have more than 5 windings of the wound membrane, and the middle ring layer 302 is formed by the stacking and winding of a polypropylene filter membrane and a sterilizing filter paper, with the middle ring layer having more than 1 winding.

[0031] In a preferred embodiment, the filtration pore size of the polypropylene filter membrane is 10 micrometers. The polypropylene filter membrane is manufactured using a melt-blown process. Melt-blown polypropylene membrane refers to a polypropylene filter membrane prepared using the melt-blown method. It is a nonwoven fabric / membrane made of polypropylene material with a disordered, three-dimensional network microporous structure.

[0032] In a preferred embodiment, the antibacterial filter paper is made of positively charged fibers.

[0033] In a preferred embodiment, the antibacterial filter paper is made of positively charged fibers, bicomponent bonding fibers, activated carbon fibers, and antibacterial materials. The positively charged fibers, bicomponent bonding fibers, activated carbon fibers, and antibacterial materials are formed using a wet papermaking process to obtain the antibacterial filter paper of this application. It should be noted that positively charged fibers refer to fiber materials with a net positive charge on their surface. The positive charge characteristic of positively charged fibers is usually imparted through chemical modification or physical treatment, giving them unique advantages in filtration, adsorption, and antibacterial applications. They are particularly adept at capturing negatively charged particles, microorganisms, and certain soluble pollutants. Therefore, in this application, the positively charged fibers can adsorb negatively charged bacteria on their surface, thus achieving a sterilization effect.

[0034] In a preferred embodiment, the positively charged fiber is made from cellulose fiber that has been pulped and modified to a degree of freeness greater than 50°SR. The cellulose fiber is either natural cellulose fiber or regenerated cellulose fiber. The positively charged fiber is modified from cellulose fiber, which is either natural cellulose fiber or regenerated cellulose fiber that has undergone pulping treatment to a degree of freeness greater than 50°SR. After pulping treatment, the hydroxyl groups on the fiber surface are exposed, and then quaternary ammonium salts are grafted onto the hydroxyl groups.

[0035] In a preferred embodiment, the bicomponent bonding fiber is a PP-PE or PET-PET core-sheath structure fiber. It should be noted that PP refers to polypropylene, PE refers to polyethylene, and PP-PE refers to a composite material of polypropylene and polyethylene; PET refers to polyethylene terephthalate, and PET-PET refers to a material with a polyethylene terephthalate material itself or a homogeneous composite structure. The fiber length of the bicomponent bonding fiber is 3-6 mm, and the sheath melting point of the bicomponent bonding fiber is 100-130℃.

[0036] In a preferred embodiment, activated carbon fiber is prepared by pulping with a beating degree of less than 50°SR, and the antibacterial material is nano-silver antibacterial powder coated with glass microspheres, the particle size range of which is 20-60 micrometers.

[0037] When using the filter cartridge, water enters from the outer PP filter membrane layer, passes through the antibacterial filter paper layer and the inner PP filter membrane layer, and then enters the central tube. The main principle of bacterial removal is that the positively charged fibers adsorb negatively charged bacteria on their surface. The antibacterial components in the filter paper inhibit bacterial growth or kill bacteria through contact, preventing bacteria from growing inside the filter paper and affecting the filter's effectiveness.

[0038] When using the filter cartridge, water enters from the outer PP filter membrane layer, passes through the antibacterial filter paper layer and the inner ring layer of PP filter membrane (also called polypropylene filter membrane), and then enters the central tube. The main principle of bacterial removal is that the positively charged fibers adsorb negatively charged bacteria on their surface. The antibacterial components in the filter paper inhibit bacterial growth or kill bacteria through contact, preventing bacteria from growing inside the filter paper and affecting the filter's effectiveness.

[0039] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions 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 a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A wound filter element, characterized in that, The filter includes a central frame, which is a cylindrical structure with a water-passing cavity inside. Multiple through holes communicating with the water-passing cavity are provided on the sides of the central frame. A filter body, which is a cylindrical hollow structure, is wrapped around the outside of the central frame. The filter body consists of a wound membrane wrapped around the outer surface of the central frame. The wound membrane includes a first membrane layer and a second membrane layer stacked together. The first membrane layer has a first surface and a second surface, with the first surface and the second surface facing away from each other. The second membrane layer covers and is stacked on the first surface of the first membrane layer. The first membrane layer is a polypropylene filter membrane, and the second membrane layer is a sterilizing filter paper.

2. The wound filter element as described in claim 1, characterized in that, The first membrane layer has a first region at the starting end of winding and a second region at the ending end of winding. The middle section of the first membrane layer is a coating region, and the second membrane layer covers and overlaps the coating region of the first membrane layer to form a filter stack.

3. The wound filter element as described in claim 2, characterized in that, The wound membrane is wound sequentially from the inside to the outside on the central skeleton to form an inner ring layer, a middle ring layer and an outer ring layer. The inner ring layer is formed by winding the first membrane layer in the first region, the middle ring layer is formed by winding the filter stack, and the outer ring layer is formed by winding the first membrane layer in the second region.

4. The wound filter element as described in claim 3, characterized in that, The inner and outer ring layers each have more than 5 windings of the wound membrane. The middle ring layer is a stack of polypropylene filter membrane and sterile filter paper, and the middle ring layer has more than 1 winding of the wound membrane.

5. The wound filter element as described in claim 3, characterized in that, The filtration pore size of the polypropylene filter membrane is 10 micrometers.

6. The wound filter element as described in claim 1, characterized in that, The sterilizing filter paper is made of positively charged fibers.

7. The wound filter element as described in claim 1, characterized in that, The sterilizing filter paper is made of positively charged fibers, bicomponent bonding fibers, activated carbon fibers, and antibacterial materials.

8. The wound filter element as described in claim 6 or 7, characterized in that, The positively charged fiber is made from cellulose fiber that has been pulped and modified to a pulping degree greater than 50°SR. The cellulose fiber is either natural cellulose fiber or regenerated cellulose fiber.

9. The wound filter element as described in claim 7, characterized in that, The bicomponent bonding fiber is a PP-PE or PET-PET core-sheath structure fiber with a fiber length of 3-6 mm and a sheath melting point of 100-130℃.

10. The wound filter element as described in claim 7, characterized in that, The activated carbon fiber is prepared by pulping with a pulping degree of less than 50°SR. The antibacterial material is nano-silver antibacterial powder encapsulated in glass microspheres, and the particle size range of the antibacterial material is 20-60 micrometers.

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