A wound filter cartridge and composite filter cartridge

Abstract

The utility model relates to water purification equipment technical field, concretely relates to a kind of winding filter core and composite filter core, winding filter core includes filter drum and filter body placed in filter drum;Filter body includes central tube, at least one filter unit is wound on the central tube, and the filter unit includes filter material corresponding arrangement;In water inlet channel, water inlet is located second short side and first long side, filter material is sealed at remaining edge;In water outlet channel, water outlet is located first short side and / or second long side, filter material is sealed at remaining edge.The application improves the filtration area of filter core, and expands and optimizes the water inlet channel of filter core, so as to prevent clogging.Optimizes the sealing form of filter core and end cover, so as to prevent water leakage.Simultaneously, the application also proposes different filter core composite form, so as to solve multiple problems such as filtering, adsorption and scale inhibition in one filter core.

Description

Technical Field

[0001] This utility model relates to the field of water purification equipment technology, specifically to a wound filter element and a composite filter element. Background Technology

[0002] Currently, pretreatment units in large-scale water treatment equipment commonly employ quartz filters or multi-media filters composed of filter media such as quartz sand and granular activated carbon. These filters achieve filtration through the accumulation of filter media, are simple to manufacture, but have relatively low precision, resulting in a large flow rate. Combined with backwashable valves, their service life can be extended, leading to their widespread use. However, due to limitations in filtration precision, the filter bed is typically thick, requiring a large amount of quartz sand, activated carbon, and other granular media for accumulation, resulting in significant weight and volume. When replacing the filter media, a large amount of granular media needs to be emptied and refilled. Because the depleted filter media contains water, piling it on the ground can cause wastewater to overflow, requiring shoveling and cleaning, leading to poor aesthetics and high labor and transportation costs. Furthermore, the relatively low filtration precision of these filters often necessitates the use of a security filter, resulting in frequent replacement of the security filter cartridge.

[0003] While conventional filter cartridges on the market have sufficient precision, their filtration area is usually small, making them prone to clogging. This leads to frequent replacements, which is not only cumbersome and results in a poor customer experience, but also increases costs. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a wound filter element and a composite filter element.

[0005] The technical solution provided by this utility model is as follows: In a first aspect, a wound filter cartridge includes a filter cartridge and a filter body placed in the filter cartridge; The filter body includes a central tube on which at least one filter unit is wound, the filter unit including correspondingly disposed filter material; One side of the filter media forms an inlet channel with the adjacent filter media; the other side of the filter media forms an outlet channel with the adjacent filter media; wherein, an inlet support is provided in the inlet channel and an outlet support is provided in the outlet channel; The filter material has a first short side and a second short side, and a first long side and a second long side; In the water inlet channel, the water inlet is located on the second short side and the first long side, and the filter media is sealed at the remaining edges; In the water outlet channel, the water outlet is located on the first short side and / or the second long side, and the filter media is sealed at the remaining edges; The filter body is equipped with a first end cap at the water outlet end. The outer wall of the first end cap is sealed to the inner wall of the filter cylinder, and the inner wall of the first end cap is sealed to the outer side of the second long side of the filter body.

[0006] As an optional technical solution in the first aspect, the water inlet end of the filter body is equipped with a second end cap, and there is a gap between the outer wall of the second end cap and the inner wall of the filter cylinder.

[0007] As an alternative technical solution in the first aspect, the filter material is sealed at the edge of the flow channel by folding, adhesive bonding, hot melting, or ultrasonic welding.

[0008] Optionally, the inner ring of the central tube is wound with a water outlet support member, and the outer ring is wound with the filter unit; in the water outlet channel, the sealing glue line at the first long side extends to the central tube, sealing the first long side, the central tube, and the water outlet support member of the inner ring of the central tube.

[0009] Alternatively, in the water inlet channel, the sealing line at the second long side extends away from the central pipe.

[0010] As an optional technical solution in the first aspect, the inner wall of the first end cap is sealed with the outer edge or end circumference of the water outlet of the filter body by glue; the outer wall of the first end cap is sealed with the inner wall of the filter cylinder by a sealing ring.

[0011] Optionally, the sidewall of the central tube is provided with a through hole, through which the water filtered by the filter body can flow into the inner cavity of the central tube.

[0012] Second, a composite filter element, including the wound filter element described in the first aspect or any optional technical solution of the first aspect; The central tube has openings at both ends; one end opening is connected to the outlet located on the second long side; the inner cavity of the central tube is equipped with filter media; the water flowing out of the outlet flows into the inner cavity of the central tube, is filtered by the filter media, and then flows out from the other end opening.

[0013] Thirdly, a composite filter element, comprising the wound filter element described in the first aspect or any of the optional technical solutions of the first aspect; It also includes an inner core, which is installed inside the central tube; a third end cap and a fourth end cap are respectively installed at both ends of the inner core; The outer wall of the third end cap is sealed to the inner wall of the central tube; A gap is provided between the outer wall of the inner core and the inner wall of the central tube, and this gap is connected to the flow channel provided on the fourth end cap; Water flowing out from the first end cap flows through the channel provided in the fourth end cap into the gap, is filtered by the inner core, enters the inner cavity of the inner core, and then flows out through the third end cap.

[0014] Fourthly, a composite filter element includes the wound filter element described in the first aspect or any optional technical solution of the first aspect; it also includes a second filter element, the inlet end of which is connected to the outlet side of the first end cap of the wound filter element; the second filter element and the wound filter element are connected in series and placed in the same filter cartridge.

[0015] As an optional technical solution in the fourth aspect, the second filter element includes a cylinder body, in which filter media is installed. A fifth end cap and a sixth end cap are respectively installed at both ends of the cylinder body. At least one outer wall of the fifth end cap and the sixth end cap is sealed to the inner wall of the cylinder body. The water inlet side of the fifth end cap is connected to the water outlet side of the first end cap.

[0016] As a fourth aspect, the second filter element includes a filter element body with a central cavity, and a fifth end cap and a sixth end cap are respectively installed at both ends of the filter element body. There is a gap between the outer wall of the fifth end cap and the inner wall of the filter cartridge; the outer wall of the sixth end cap is sealed to the inner wall of the filter cartridge.

[0017] Optionally, a second central tube is installed in the central cavity, and the side wall of the second central tube is provided with a through hole; the second central tube has an opening only at one end near the sixth end cap.

[0018] Optionally, a second central tube is installed in the central cavity, and the side wall of the second central tube is provided with a through hole; the second central tube is connected to the central tube.

[0019] Optionally, filter media is provided between the second central tube and the filter element body, and non-woven fabric or filter screen is wound around the second central tube.

[0020] Optionally, the filter media is one or a combination of scale inhibitors, antibacterial agents, resins, and activated carbon.

[0021] Compared with the prior art, the technical solution provided by this utility model has the following advantages: This invention increases the filtration area of ​​the filter element and expands and optimizes the inlet channel, thereby preventing clogging. The sealing method between the filter element and the end cap is optimized to prevent cross-contamination. In the water treatment industry, this filter element can replace multiple ordinary filter elements, or traditional sand filters or multi-media filters, saving space, reducing costs, decreasing replacement frequency, and facilitating replacement. Furthermore, this application proposes different filter element composite forms, thereby solving multiple problems such as filtration, adsorption, and scale inhibition within a single filter element. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the water inlet channel in one embodiment of this application; Figure 2 This is a schematic diagram of the water outlet channel in one embodiment of this application; Figure 3 This is a schematic diagram of a wound filter element for removing the filter cartridge in one embodiment of this application; Figure 4 This is a schematic diagram of a wound filter element with the filter cartridge removed and the central tube having a through hole, according to one embodiment of this application. Figure 5 This is a schematic diagram showing the filter cartridge of a wound filter element with a filter cartridge inlet in one embodiment of this application; Figure 6 This is a schematic diagram of the water flow direction of a wound filter element in one embodiment of this application; Figure 7 This is a schematic diagram of a composite filter element with an inner core in one embodiment of this application; Figure 8 This is a schematic diagram of a composite filter element with a cylindrical body in one embodiment of this application; Figure 9 This is a schematic diagram of a composite filter element with a filter element body in one embodiment of this application.

[0023] Explanation of the labels in the diagram: Filter material 101, first short side 101-1, second short side 101-2, first long side 101-3, second long side 101-4, center tube 102, through hole 102-1, first long side extension adhesive line 103, second long side extension adhesive line 104, second end cap 105, first end cap 106; Filter cartridge 201, filter cartridge inlet 201-1; Inner core 301, gap 302; Cylinder 401, fifth end cap 402, sixth end cap 403, filter element 404, second central tube 405. Detailed Implementation

[0024] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0025] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0026] In one embodiment, this application proposes a wound filter element, such as... Figures 1-6 As shown, the wound filter cartridge includes a filter cylinder 201, in which a filter body is placed. The inner diameter of the filter cylinder 201 is larger than the outer diameter of the filter body, thereby forming a gap for water flow between the inner wall of the filter cylinder 201 and the outer wall of the filter body.

[0027] The filter body includes a central tube 102 and at least one filter unit. Specifically, the filter body is made by winding the filter unit around the central tube 102.

[0028] In this embodiment, the filter unit includes a corresponding filter material 101. The corresponding arrangement here means that the filter unit is formed by stacking two filter materials 101. The two filter materials 101 can be two separate filter materials 101 stacked together, or a whole filter material 101 can be folded in half to form the filter unit.

[0029] like Figures 1-2 As shown, one side of filter media 101 forms an inlet channel with an adjacent filter media 101, and the other side of filter media 101 forms an outlet channel with an adjacent filter media 101. An inlet support is provided in the inlet channel, and an outlet support is provided in the outlet channel. Water to be filtered enters the inlet channel, passes through the filter media 101 to complete filtration, and the filtered water enters the outlet channel.

[0030] The filter material 101 has opposing first short sides 101-1 and second short sides 101-2, and opposing first long sides 101-3 and second long sides 101-4. In this embodiment, the first short sides 101-1 and second short sides 101-2 are approximately parallel to the axial direction of the central tube 102. When unwound, the length extension directions of the first long sides 101-3 and second long sides 101-4 are approximately perpendicular to the axial direction of the central tube 102.

[0031] In the water inlet channel, the water inlet is located at the second short side 101-2 and the first long side 101-3. At this time, the filter material 101 is sealed at the remaining edges. Specifically, the filter material 101 is sealed at the first short side 101-1 and the second long side 101-4.

[0032] In the water outlet channel, the water outlet is located on the first short side 101-1 and / or the second long side 101-4, and the filter media 101 is sealed at the remaining edges.

[0033] Specifically, when both the first short side 101-1 and the second long side 101-4 have water outlets, then the second short side 101-2 and the first long side 101-3 are both sealed. When only the first short side 101-1 has a water outlet, then the second short side 101-2, the first long side 101-3, and the second long side 101-4 are sealed. When only the second long side 101-4 has a water outlet, then the second short side 101-2, the first long side 101-3, and the first short side 101-4 are sealed.

[0034] It should be noted that when the water outlet is located on the first short side 101-1, the side wall of the central tube 102 needs to be provided with a through hole 102-1. The through hole 102-1 connects the water outlet channel and the inner cavity of the central tube 102, so that the water in the water outlet channel flows out of the filter element through the inner cavity of the central tube 102. Alternatively, the flow channel support material can be wound around the central tube 102 first, and then the filter unit can be wound around it. The water flowing out from the first short side 101-1 flows out of the filter element through the gaps in the flow channel support material wound around the inner ring of the central tube 102.

[0035] A first end cap 106 is installed at the water outlet end of the filter element. The outer wall of the first end cap 106 seals with the inner wall of the filter cartridge 201, thereby preventing water in the gap between the inner wall of the filter cartridge 201 and the outer wall of the filter element from mixing with the filtered water. The inner wall of the first end cap 106 seals with the outer side of the second long side 101-4 of the filter element. Water in the water outlet channel can flow out of the filter element through the water outlet channel provided in the first end cap 106 and / or the central tube 102.

[0036] This application allows water to enter through the first long side 101-3 and the second short side 101-2 (outer side of the filter element), resulting in a more open water inlet channel. Compared to water entering through the central tube, water entering from the outer side is not limited by a few holes, has a larger outer surface area, and can assist in water intake along the entire second short side 101-2, effectively reducing water resistance and preventing impurities from clogging the water inlet channel. Furthermore, this application allows water to exit not only from the second long side 101-4 but also from the first short side 101-1, flowing out through the central tube or the support material between the central tube and the filter unit, expanding the water outlet channel, reducing pressure loss, and improving filter media utilization.

[0037] In this application, the outer ring of the wound filter element does not have a water-proof material. On the one hand, an inlet can be set at the second short side 101-2, allowing the water to be filtered to flow into the inlet channel from the second short side 101-2. On the other hand, the surface of the filter element is a mesh and filter material, which makes it easy for glue to penetrate. Without a water-proof material, the filter material is easily penetrated by glue, and the adhesion to the inner wall of the end cap is more reliable than the prior art, with no risk of falling off.

[0038] Preferably, the end faces of the first end cap 106 and the second end cap 105 are spoke-shaped ribs or perforated plates, which can be used for guiding water inlet and outlet.

[0039] The inlet and outlet support components can be made of polypropylene mesh or polyester guide cloth.

[0040] The filter material 101 can be a composite material of one or more of the following: non-woven fabric, activated carbon fiber, carbon-reinforced cloth, carbon paper, microfiltration membrane, ultrafiltration membrane, nanofiltration membrane, and reverse osmosis membrane.

[0041] As an optional implementation, a second end cap 105 is installed at the water inlet end of the filter element, and there is a gap between the outer wall of the second end cap 105 and the inner wall of the filter element 201. That is, the outer wall of the second end cap 105 is not sealed to the inner wall of the filter element 201. The second end cap 105 may or may not be sealed to the outer side of the first long side 101-3.

[0042] A water inlet channel can be provided on the second end cap 105. The gap between the inner wall of the filter cartridge 201 and the outer wall of the filter body 201 connects to the water inlet channel, which is also connected to the water inlet at the first long side 101-3. Part of the water enters the gap between the filter body 101 and the filter cartridge 201, and then enters the water inlet channel at the second short side 101-2. The other part enters the water inlet channel through the water inlet provided on the first long side 101-3.

[0043] Alternatively, a filter cartridge inlet 201-1 can be provided on the filter cartridge 201, allowing water to enter through the inlet 201-1. The water flows into the gap between the inner wall of the filter cartridge 201 and the outer wall of the filter body. Part of the water enters the water inlet channel through the second short side 101-2. The other part of the water enters the water inlet channel and enters the water inlet channel through the water inlet provided on the first long side 101-3.

[0044] In existing technologies, water-resistant materials cannot be folded with filter media to form a seal, and the water-resistant materials are also impermeable to adhesives, resulting in unreliable bonding. Furthermore, different materials are not easy to weld. For wound filter cartridges, since water-resistant materials are not used, as an optional technical solution, the filter media 101 is sealed at the flow channel edge by folding, adhesive bonding, heat fusion, or ultrasonic welding.

[0045] Preferably, the water outlet support is wound around the inner ring of the central tube 102, and the filter unit is wound around the outer ring. That is, the water outlet support is wound around several times first, and then the filter unit is wound around.

[0046] In the water outlet channel, the sealant line at the first long side 101-3 extends to the central pipe 102 (e.g. Figure 3 The first long side extension adhesive line 103 shown seals the first long side 101-3, the central tube 102, and the water outlet support of the inner ring of the central tube 102, preventing raw water from entering the water outlet channel. Water can also flow out from the first short side, along the wound water outlet support, from between the central tube and the filter unit, expanding the water production channel.

[0047] In addition, since the filter element tightens towards the inner ring, in order to prevent the flow channel from narrowing due to the tightening of the inner ring and affecting the water output, a water outlet support is set in the inner ring to support the filter element, prevent the flow channel from narrowing, and ensure the water output speed.

[0048] Furthermore, preferably, in the water inlet channel, the sealing line at the second long side 101-4 extends in a direction away from the central pipe 102 (e.g., Figure 1 (See the second long side extension adhesive line 104). After the filter unit is wound up, more adhesive will be applied to the outside to improve the sealing effect.

[0049] In existing technologies, clamps are used to seal the filter element and the inner wall of the filter cartridge. However, because the filter element is flexible and has tolerances, the sealing performance is poor. In this embodiment, the inner wall of the first end cap 106 is sealed to the outer edge or circumference of the water outlet end of the filter element with glue, and the outer wall of the first end cap 106 is sealed to the inner wall of the filter cartridge 201 with a sealing ring. That is, a rigid seal is used in this application, which provides a better sealing effect.

[0050] As an optional implementation, the side wall of the central tube 102 is provided with a through hole 102-1, through which the water filtered by the filter body can flow into the inner cavity of the central tube 102 through the through hole 102-1 and then flow out through the central tube 102.

[0051] In another embodiment, this application also proposes a composite filter element, including the aforementioned wound filter element. Furthermore, the central tube 102 has openings at both ends, with one opening communicating with the outlet located on the second long side 101-4. Filter media is disposed within the inner cavity of the central tube 102. Water flowing from the outlet then enters the inner cavity of the central tube 102, is filtered by the filter media, and then flows out from the other opening. This achieves secondary filtration of the water.

[0052] In another embodiment, this application proposes a composite filter element, such as... Figure 7 As shown, the device includes the aforementioned wound filter element. It also includes an inner core 301, which is installed in the inner cavity of the central tube 102. A third end cap and a fourth end cap are respectively installed at both ends of the inner core 301.

[0053] The outer wall of the third end cap is sealed to the inner wall of the central tube 102. A gap 302 is provided between the outer wall of the inner core and the inner wall of the central tube 102, and this gap 302 communicates with the flow channel provided in the fourth end cap. In this embodiment, the water flowing out of the first end cap 106 flows through the flow channel provided in the fourth end cap to the gap 302, is filtered by the inner core, enters the inner cavity of the inner core, and then flows out through the third end cap, thereby achieving secondary filtration.

[0054] Preferably, the side wall of the central tube 102 is provided with a through hole 102-1, through which the water filtered by the filter body can flow to the outer wall of the inner core, and then be filtered again by the inner core. The filtered water enters the inner cavity of the inner core and then flows out through the third end cap, thereby achieving secondary filtration.

[0055] Preferably, the fourth end cap can be integrated with the first end cap. Additionally, the inner cavity of the inner core can also hold filter media.

[0056] In this embodiment, the inner core is a PP cotton, carbon rod, a composite filter element of PP cotton and carbon rod, or an activated carbon fiber composite filter element.

[0057] In another embodiment, this application proposes a composite filter element, including the above-mentioned wound filter element and a second filter element. The water inlet end of the second filter element is connected to the water outlet side of the first end cap 106 of the wound filter element. That is, the second filter element and the wound filter element are connected in series. The second filter element and the wound filter element are placed in the same filter cartridge 201 to achieve secondary filtration.

[0058] The filter cartridges can be made of standard membrane housings such as 4020, 4021, 4040, 8040, and 8020. This not only saves space compared to sand filters or multi-media filters, but also makes it easier to control and standardize materials due to the uniformity of the housings. When arranging equipment, they can be arranged uniformly and neatly, simplifying the layout and piping setup. At the same time, disassembling and assembling the filter cartridges is simpler and more hygienic than replacing sand and carbon.

[0059] For the second filter element, please refer to the following embodiment: like Figure 8 As shown, the second filter element includes a cylindrical body 401, the inner cavity of which is filled with granular filter media. A fifth end cap 402 and a sixth end cap 403 are respectively installed at both ends of the cylindrical body 401. At least one outer wall of the fifth end cap 402 and the sixth end cap 403 is sealed to the inner wall of the cylindrical body 401 to prevent water leakage. The inlet side of the fifth end cap 402 is connected to the outlet side of the first end cap 106. Water filtered by the wound filter element can enter the cylindrical body 401, undergo secondary filtration by the filter media, and then flow out from the sixth end cap 403.

[0060] like Figure 9 As shown, the second filter element includes a filter element body 404, which is made of non-woven fabric or other materials wound together. The filter element body 404 has a central cavity, and a fifth end cap 402 and a sixth end cap 403 are respectively installed at both ends of the filter element body 404. There is a gap between the outer wall of the fifth end cap 402 and the inner wall of the filter cartridge 201. The outer wall of the sixth end cap 403 is sealed to the inner wall of the filter cartridge 201.

[0061] Water filtered by the wound filter cartridge will flow to the outer wall of the filter cartridge body 404, and after being filtered by the filter cartridge body 404, it will enter the central cavity of the filter cartridge body and then flow out from the sixth end cap.

[0062] Alternatively, granular filter media can be placed in the central cavity of the filter element.

[0063] Preferably, in one embodiment, a second central tube 405 is installed in the central cavity, the sidewall of the second central tube 405 is provided with a through hole, and the second central tube 405 is provided with an opening only at one end near the sixth end cap 403.

[0064] The end of the second central tube 405 near the fifth end cap 402 is blocked, and the end of the second central tube with an opening extends out of the sixth end cap 403. At this time, the sixth end cap 403 does not need to be sealed with the inner wall of the filter cartridge, because the filtered water can be drawn out through the second central tube 405.

[0065] In another embodiment, a second central tube 405 is installed in the central cavity, and the side wall of the second central tube 405 has a through hole. The second central tube 405 is connected to the central tube 102. In this case, the two central tubes are connected as one, and the filtered water can flow out from either end of the filter cartridge.

[0066] Optionally, granular filter material is provided between the second central tube 405 and the filter element body 404, and non-woven fabric or filter screen is wound around the second central tube 405 to prevent leakage of granular filter material.

[0067] Optionally, the filter media is one or a combination of scale inhibitors, antibacterial agents, resins, and activated carbon.

[0068] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A wound filter element, characterized in that: Includes a filter cartridge (201) and a filter element placed in the filter cartridge (201); The filter body includes a central tube (102) on which at least one filter unit is wound, the filter unit including a correspondingly disposed filter material (101). One side of the filter media (101) forms an inlet channel with the adjacent filter media (101); the other side of the filter media (101) forms an outlet channel with the adjacent filter media (101); wherein, an inlet support is provided in the inlet channel and an outlet support is provided in the outlet channel; The filter material (101) has a first short side (101-1) and a second short side (101-2) with opposite sides, and a first long side (101-3) and a second long side (101-4) with opposite sides. In the water inlet channel, the water inlet is located on the second short side (101-2) and the first long side (101-3), and the filter media (101) is sealed at the remaining edges; In the water outlet channel, the water outlet is located on the first short side (101-1) and / or the second long side (101-4), and the filter media (101) is sealed at the remaining edges; The water outlet end of the filter body is equipped with a first end cap (106), the outer wall of the first end cap (106) is sealed with the inner wall of the filter cylinder (201), and the inner wall of the first end cap (106) is sealed with the outer side of the second long side (101-4) of the filter body.

2. The wound filter element according to claim 1, characterized in that: The water inlet end of the filter body is equipped with a second end cap (105), and there is a gap between the outer wall of the second end cap (105) and the inner wall of the filter cylinder (201).

3. The wound filter element according to claim 1, characterized in that: The filter material (101) is sealed at the edge of the flow channel by folding, adhesive bonding, hot melting, or ultrasonic welding.

4. The wound filter element according to claim 3, characterized in that: The water outlet support is wound around the inner ring of the central tube (102), and the filter unit is wound around the outer ring; In the water outlet channel, the sealing glue line at the first long side (101-3) extends to the central tube (102), sealing the first long side (101-3), the central tube (102), and the water outlet support of the inner ring of the central tube (102).

5. The wound filter element according to claim 3, characterized in that: In the water inlet channel, the sealing line at the second long side (101-4) extends away from the central pipe (102).

6. The wound filter element according to claim 1, characterized in that: The inner wall of the first end cap (106) is sealed with glue to the outer edge or end circumference of the water outlet of the filter body; The outer wall of the first end cap (106) is sealed to the inner wall of the filter cartridge (201) by a sealing ring.

7. The wound filter element according to any one of claims 1-6, characterized in that: The side wall of the central tube (102) is provided with a through hole (102-1), through which the water filtered by the filter body can flow into the inner cavity of the central tube (102).

8. A composite filter element, characterized in that: Including the wound filter element as described in any one of claims 1-6; The central tube (102) has openings at both ends; one end of the opening is connected to the outlet located on the second long side (101-4); The inner cavity of the central tube (102) is provided with filter material; The water flowing out of the outlet flows into the inner cavity of the central pipe (102), is filtered by the filter media, and then flows out from the other end.

9. The composite filter element according to claim 8, characterized in that: The filter media is one or a combination of scale inhibitors, antibacterial agents, resins, and activated carbon.

10. A composite filter element, characterized in that: Including the wound filter element as described in any one of claims 1-7; It also includes an inner core (301) which is installed in the inner cavity of the central tube (102); The inner core (301) has a third end cap and a fourth end cap installed at both ends respectively; The outer wall of the third end cap is sealed to the inner wall of the central tube (102); A gap (302) is provided between the outer wall of the inner core and the inner wall of the central tube (102), and the gap (302) is connected to the flow channel provided in the fourth end cap; Water flowing out from the first end cap flows through the flow channel provided in the fourth end cap into the gap (302), is filtered by the inner core, enters the inner cavity of the inner core, and then flows out through the third end cap.

11. A composite filter element, characterized in that: Including the wound filter element as described in any one of claims 1-7; It also includes a second filter element, the inlet end of which is connected to the outlet side of the first end cap (106) of the wound filter element; The second filter element is connected in series with the wound filter element and placed in the same filter cartridge (201).

12. The composite filter element according to claim 11, characterized in that: The second filter element includes a cylindrical body (401) with filter media installed inside the inner cavity of the cylindrical body (401); The cylinder (401) is equipped with a fifth end cap (402) and a sixth end cap (403) at both ends respectively. Among them, the outer wall of at least one of the fifth end cap (402) and the sixth end cap (403) is sealed to the inner wall of the cylinder (401); The water inlet side of the fifth end cap (402) is connected to the water outlet side of the first end cap (106).

13. The composite filter element according to claim 11, characterized in that: The second filter element includes a filter element body (404), the filter element body (404) has a central cavity, and a fifth end cap (402) and a sixth end cap (403) are respectively installed at both ends of the filter element body (404). There is a gap between the outer wall of the fifth end cap (402) and the inner wall of the filter cartridge (201); The outer wall of the sixth end cap (403) is sealed to the inner wall of the filter cartridge (201).

14. The composite filter element according to claim 13, characterized in that: A second central tube (405) is installed in the central cavity, and the side wall of the second central tube (405) is provided with a through hole; The second central tube (405) has an opening only at one end near the sixth end cap (403).

15. The composite filter element according to claim 13, characterized in that: A second central tube (405) is installed in the central cavity, and the side wall of the second central tube (405) is provided with a through hole; The second central tube (405) is connected to the central tube (102).

16. The composite filter element according to claim 14 or 15, characterized in that: Filter material is provided between the second central tube (405) and the filter element body (404), and non-woven fabric or filter screen is wound on the second central tube (405).

17. The composite filter element according to claim 16, characterized in that: The filter media is one or a combination of scale inhibitors, antibacterial agents, resins, and activated carbon.

Images