Winding type filter element and composite filter element

Abstract

The invention relates to the technical field of water purification equipment, in particular to a winding type filter element and a composite filter element, and the winding type filter element comprises a filter cartridge and a filter body placed in the filter cartridge; the filter body comprises a central pipe, at least one filter unit is wound on the central pipe, and the filter unit comprises a filter material which is correspondingly arranged; in the water inlet flow channel, the water inlet is positioned on the second short side and the first long side, and the filter material is sealed at the other edges; in the water outlet flow channel, the water outlet is located in the first short edge and / or the second long edge, and the other edges of the filter material are sealed. The filter area of the filter element is increased, and the water inlet flow channel of the filter element is expanded and optimized, so that blockage can be prevented. And the sealing form of the filter element and the end cover is optimized, so that water mixing can be prevented. Meanwhile, the invention further provides different filter element composite forms, so that multiple problems of filtration, adsorption, scale inhibition and the like are solved in one filter element.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purification equipment, in particular to a winding type filter element and a composite filter element. BACKGROUND

[0002] At present, the pre-treatment device of large water treatment equipment generally adopts quartz sand, granular activated carbon and other filter materials to form a quartz filter or a multi-medium filter. This type of filter filters by stacking filter materials, is simple to manufacture, has poor precision, and thus has a large water flow. In addition, it is equipped with a valve head that can be backwashed, which can prolong the service life, and thus is widely used in reality. However, due to the filtering precision, the filter bed is usually thick, which requires more quartz sand, activated carbon and other granular media to be stacked, and the weight and volume are large. When replacing the filter material, a large amount of granular filter material needs to be poured out and then refilled. Since the failed filter material contains water, it will cause sewage to flow horizontally if stacked on the ground, and needs to be shoveled away and cleaned up, which is poor in sensory experience and high in labor and transportation costs. At the same time, this type of filter has poor filtering precision, and often needs to be used in combination with a safety filter, which causes the filter element of the safety filter to be replaced frequently.

[0003] The conventional filter element on the market has sufficient precision, but its filtering area is usually small, which is easy to be blocked, resulting in frequent replacement of the filter element, which is not only more cumbersome, but also poor in customer experience, and also causes high cost. SUMMARY

[0004] To solve the above problems, the purpose of the present application is to provide a winding type filter element and a composite filter element.

[0005] The technical scheme provided by the present application is as follows: In a first aspect, a winding type filter element includes a filter cartridge and a filter body placed in the filter cartridge. The filter body includes a center pipe, and at least one filter unit is wound on the center pipe, and the filter unit includes filter material arranged correspondingly. One side of the filter material forms a water inlet flow channel with the adjacent filter material, and the other side of the filter material forms a water outlet flow channel with the adjacent filter material; wherein a water inlet support is arranged in the water inlet flow channel, and a water outlet support is arranged in the water outlet flow channel. The filter material has opposite first and second short sides, and opposite first and second long sides. In the water inlet flow channel, the water inlet is located at the second short side and the first long side, and the filter material is sealed at the remaining edges. In the water outlet flow channel, the water outlet is located at the first short side and / or the second long side, and the filter material is sealed at the remaining edges. A first end cover is installed at the water outlet end of the filter body, the outer wall of the first end cover is sealed with the inner wall of the filter cartridge, and the inner wall of the first end cover is sealed with the outer side of the second long side of the filter body.

[0006] As an optional technical solution of the first aspect, a second end cover is installed at the water inlet end of the filter body, and a gap exists between the outer wall of the second end cover and the inner wall of the filter cartridge.

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

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

[0009] Optionally, in the water inlet flow channel, the sealing glue line at the second long side extends away from the center tube.

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

[0011] Optionally, the side wall of the center tube is provided with a through hole, and the water filtered by the filter body can flow to the inner cavity of the center tube through the through hole.

[0012] The second aspect is a composite filter element, which comprises the wound filter element of the first aspect or any optional technical solution of the first aspect. The center tube is provided with openings at both ends; one end opening is in communication with the water outlet at the second long side; the inner cavity of the center tube is provided with filter material; the water flowing out of the water outlet flows into the inner cavity of the center tube, is filtered by the filter material, and then flows out from the other end opening.

[0013] The third aspect is a composite filter element, which comprises the wound filter element of the first aspect or any optional technical solution of the first aspect. Further comprising an inner core installed in the inner cavity of the center tube; the inner core is provided with a third end cover and a fourth end cover at both ends respectively. The outer wall of the third end cover is sealed with the inner wall of the center tube. A gap is provided between the outer wall of the inner core and the inner wall of the center tube, and the gap is in communication with the flow channel provided by the fourth end cover. The water flowing out of the first end cover flows to the gap through the flow channel provided by the fourth end cover, is filtered by the inner core, enters the inner cavity of the inner core, and then flows out through the third end cover.

[0014] In a fourth aspect, a composite filter element comprises the winding type filter element of the first aspect or any one of the optional technical solutions of the first aspect; and further comprises a second filter element, wherein the water inlet end of the second filter element is in communication with the water outlet side of the first end cover of the winding type filter element; the second filter element is in series with the winding type filter element and is placed in the same filter cartridge.

[0015] As an optional technical solution of the fourth aspect, the second filter element comprises a cylinder body, wherein the inner cavity of the cylinder body is provided with filter material, and the two ends of the cylinder body are respectively provided with a fifth end cover and a sixth end cover; and the outer wall of at least one of the fifth end cover and the sixth end cover is sealed with the inner wall of the cylinder body; and the water inlet side of the fifth end cover is in communication with the water outlet side of the first end cover.

[0016] As an optional technical solution of the fourth aspect, the second filter element comprises a filter element body, wherein the filter element body is provided with a central cavity, and the two ends of the filter element body are respectively provided with a fifth end cover and a sixth end cover. The outer wall of the fifth end cover is in gap with the inner wall of the filter cartridge; and the outer wall of the sixth end cover is sealed with the inner wall of the filter cartridge.

[0017] Optionally, a second central pipe is arranged in the central cavity, and the side wall of the second central pipe is provided with a through hole; and the second central pipe is provided with an opening only at the end close to the sixth end cover.

[0018] Optionally, a second central pipe is arranged in the central cavity, and the side wall of the second central pipe is provided with a through hole; and the second central pipe is in communication with the central pipe.

[0019] Optionally, filter material is arranged between the second central pipe and the filter element body, and non-woven fabric or filter screen is wound on the second central pipe.

[0020] Optionally, the filter material is one or a combination of several of the following: scale inhibitor, bacteriostatic agent, resin, and activated carbon.

[0021] Compared with the prior art, the technical solution provided by the present application has the following beneficial effects: The present application improves the filtering area of the filter element, and optimizes the water inlet flow channel of the filter element, thereby preventing clogging. The sealing form of the filter element and the end cover is optimized, thereby preventing water leakage. In the water treatment industry, the filter element can replace multiple ordinary filter elements or traditional sand filters or multi-medium filters, thereby saving space, saving cost, reducing replacement frequency, and facilitating replacement. Meanwhile, different composite forms of filter elements are provided, thereby solving multiple problems such as filtering, adsorption, and scale inhibition in one filter element. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the water inlet flow channel in one embodiment of the present application; Figure 2 It is a schematic diagram of the water outlet flow channel in one embodiment of the present application; Figure 3 A schematic diagram of a wound filter cartridge without a filter cartridge in an embodiment of the present application; Figure 4 A schematic diagram of a wound filter cartridge with a through hole in the center tube in an embodiment of the present application; Figure 5 A schematic diagram of a wound filter cartridge with a filter cartridge inlet in an embodiment of the present application; Figure 6 A schematic diagram of a wound filter cartridge with water flow direction in an embodiment of the present application; Figure 7 A schematic diagram of a composite filter cartridge with an inner core in an embodiment of the present application; Figure 8 A schematic diagram of a composite filter cartridge with a cylinder in an embodiment of the present application; Figure 9 A schematic diagram of a composite filter cartridge with a filter cartridge body in an embodiment of the present application.

[0023] Explanation of the reference numerals in the schematic 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 rubber line 103, second long side extension rubber line 104, second end cover 105, first end cover 106; Filter cartridge 201, filter cartridge inlet 201-1; Inner core 301, gap 302; Cylinder 401, fifth end cover 402, sixth end cover 403, filter cartridge body 404, second center tube 405. DETAILED DESCRIPTION

[0024] For a further understanding of the present application, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and embodiments.

[0025] The structures, proportions, sizes, etc. shown in the drawings of the present specification are merely intended to cooperate with the content disclosed in the present specification, to be understood and read by those skilled in the art, and are not intended to limit the conditions under which the present application can be implemented, and therefore do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and the like used in the present specification are merely for the convenience of clear description, and are not intended to limit the scope of implementation, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of implementation of the present application.

[0026] In one embodiment, the present application provides a coiled filter element, such as Figures 1-6 As shown in the drawings, the coiled filter element includes a filter cartridge 201, and a filter body is placed in the filter cartridge 201. The inner diameter of the filter cartridge 201 is greater than the outer diameter of the filter body, so that a water flow gap is formed between the inner wall of the filter cartridge 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 coiling the filter unit on the central tube 102.

[0028] For the filter unit, in the present embodiment, the filter unit includes a corresponding arrangement of filter material 101. Here, the corresponding arrangement means that the filter unit includes two pieces of filter material 101 stacked together. The two pieces of filter material 101 can be two separate pieces of filter material 101 stacked together, or one whole piece of filter material 101 folded in half.

[0029] As shown in the drawings, Figures 1-2 The filter material 101 on one side forms an inlet water flow channel with the adjacent filter material 101, and on the other side forms an outlet water flow channel with the adjacent filter material 101. An inlet water support is arranged in the inlet water flow channel, and an outlet water support is arranged in the outlet water flow channel. The water to be filtered enters the inlet water flow channel, and the filtered water enters the outlet water flow channel.

[0030] The filter material 101 has opposite first and second short sides 101-1 and 101-2, and opposite first and second long sides 101-3 and 101-4. In the present embodiment, the first and second short sides 101-1 and 101-2 are substantially parallel to the axial direction of the central tube 102. When not coiled, the length extension direction of the first and second long sides 101-3 and 101-4 is substantially perpendicular to the axial direction of the central tube 102.

[0031] In the inlet water flow channel, the inlet is located at the second short side 101-2 and the first long side 101-3, and 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 outlet water flow channel, the outlet is located at the first short side 101-1 and / or the second long side 101-4, and the filter material 101 is sealed at the remaining edges.

[0033] Specifically, when the first short side 101-1 and the second long side 101-4 are both provided with the water outlet, the second short side 101-2 and the first long side 101-3 are both sealed. When only the first short side 101-1 is provided with the water outlet, 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 is provided with the water outlet, the second short side 101-2, the first long side 101-3 and the first short side 101- are sealed.

[0034] It should be noted that when the water outlet is located at the first short side 101-1, the sidewall of the center tube 102 needs to be provided with a through hole 102-1 which communicates the water outlet flow channel and the inner cavity of the center tube 102, so that the water in the water outlet flow channel flows out of the filter element through the inner cavity of the center tube 102. Alternatively, the flow channel support material can be first wound on the center tube 102, and then the filter element is wound. The water flowing out of the first short side 101-1 flows out of the filter element through the gap of the flow channel support material wound on the inner cavity of the center tube 102.

[0035] The first end cover 106 is installed at the water outlet end of the filter body, and the outer wall of the first end cover 106 is sealed with the inner wall of the filter cartridge 201, so as to avoid the water existing in the gap between the inner wall of the filter cartridge 201 and the outer wall of the filter body from mixing with the filtered water. The inner wall of the first end cover 106 is sealed with the outer side of the second long side 101-4 of the filter body. The water in the water outlet flow channel can flow out of the filter element through the water outlet flow channel provided on the first end cover 106 and / or the center tube 102.

[0036] The present application can be filled with water from the first long side 101-3 and the second short side 101-2 (the outer side of the filter element), the water inlet flow channel is more open, the outer side water inlet is not limited to several holes compared to the center tube, the outer surface area is larger, the entire second short side 101-2 can assist in water inlet, effectively reducing water resistance and preventing impurities from blocking the water inlet flow channel. In addition, the present application not only can outlet water from the second long side 101-4, but also can outlet water from the first short side 101-1, through the center tube or the support material between the center tube and the filter element, expanding the water outlet flow channel, reducing pressure loss and improving filter material utilization.

[0037] In the present application, the outer ring of the wound filter element is not provided with water isolation material. On the one hand, the water inlet can be provided at the second short side 101-2, so that the water to be filtered can flow into the water inlet flow channel from the second short side 101-2. On the other hand, the surface of the filter element is a grid and filter material, which is easy for glue to penetrate. Without water isolation material, the filter material is easy to be penetrated by glue, and the adhesion between the filter material and the inner wall of the end cover is more reliable than the prior art, without the risk of falling off.

[0038] Preferably, the end face of the first end cover 106 and the second end cover 105 is a spoke-shaped rib or a circular hole flower plate, which can be used for water inlet and outlet flow guide.

[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, as the filter element is tightened towards the inner ring, in order to avoid the inner ring tightening causing the flow channel to narrow, affecting the water outlet, the water outlet support in the inner ring can support the filter element, avoid the flow channel narrowing, and ensure the water outlet speed.

[0048] In addition, preferably, in the water inlet flow channel, the sealing glue line at the second long side 101-4 extends away from the center tube 102 (as shown by the second long side extending glue line 104). After the filter element is wound, some glue is continuously applied outside to improve the sealing effect. Figure 1

[0049] In the prior art, a clamp is used to seal the filter element body and the inner wall of the filter cartridge. Since the filter element body is flexible and has tolerances, the sealing performance is poor. In this embodiment, the inner wall of the first end cover 106 is sealed with the outer edge or circumference of the water outlet end of the filter body by glue, and the outer wall of the first end cover 106 is sealed with the inner wall of the filter cartridge 201 by a sealing ring, i.e., rigid sealing is adopted in this application, and the sealing effect is better.

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

[0051] In another embodiment, the application also provides a composite filter element, which comprises the above-mentioned wound filter element. In addition, the center tube 102 is provided with openings at both ends, and one end opening is in communication with the water outlet at the second long side 101-4. The inner cavity of the center tube 102 is provided with filter material. At this time, the water flowing out of the water outlet flows into the inner cavity of the center tube 102, is filtered by the filter material, and then flows out from the other end opening. Thus, secondary filtration of water is realized.

[0052] In another embodiment, the application provides a composite filter element, which comprises the above-mentioned wound filter element. In addition, the center tube 102 is provided with openings at both ends, and one end opening is in communication with the water outlet at the second long side 101-4. The inner cavity of the center tube 102 is provided with filter material. At this time, the water flowing out of the water outlet flows into the inner cavity of the center tube 102, is filtered by the filter material, and then flows out from the other end opening. Thus, secondary filtration of water is realized. Figure 7

[0053] In this embodiment, the water flowing out of the first end cover 106 flows into the gap 302 through the flow channel provided on the fourth end cover, is filtered by the inner core, enters the inner cavity of the inner core, and then flows out through the third end cover, thereby realizing 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, so as to be filtered again by the inner core, and then flow out through the third end cover, so as to realize secondary filtration.

[0055] Preferably, the fourth end cover can be integrated with the first end cover. In addition, the inner cavity of the inner core can also be placed with filter material.

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

[0057] In another embodiment, the application provides a composite filter core, which comprises the above-mentioned wound filter core and further comprises a second filter core, the water inlet end of the second filter core being in communication with the water outlet side of the first end cover 106 of the wound filter core, that is, the second filter core and the wound filter core are connected in series, and the second filter core and the wound filter core are placed in the same filter cartridge 201, so as to realize secondary filtration.

[0058] The filter cartridge can be a standard membrane shell such as 4020, 4021, 4040, 8040, 8020, which not only saves the space of sand filters or multi-medium filters, but also facilitates the management and standardization of materials, and the equipment can be arranged uniformly and neatly, so as to simplify the layout and pipeline setting, and the disassembly and assembly of the filter core are simpler and more sanitary than the replacement of sand and carbon.

[0059] For the second filter core, the following embodiments can be referred to: As shown in Figure 8 , the second filter core comprises a cylinder body 401, the inner cavity of the cylinder body 401 is provided with granular filter material, and the two ends of the cylinder body 401 are respectively provided with a fifth end cover 402 and a sixth end cover 403, wherein at least one of the outer walls of the fifth end cover 402 and the sixth end cover 403 is sealed with the inner wall of the cylinder body 401, so as to avoid water leakage. The water inlet side of the fifth end cover 402 is in communication with the water outlet side of the first end cover 106. The water filtered by the wound filter core can enter the cylinder body 401, be filtered again by the filter material, and then flow out from the sixth end cover 403.

[0060] As shown in Figure 9 , the second filter core comprises a filter core body 404, which is wound by non-woven fabric or the like. The filter core body 404 is provided with a central cavity, and the two ends of the filter core body 404 are respectively provided with a fifth end cover 402 and a sixth end cover 403. There is a gap between the outer wall of the fifth end cover 402 and the inner wall of the filter cartridge 201. The outer wall of the sixth end cover 403 is sealed with the inner wall of the filter cartridge 201.

[0061] The water filtered by the wound filter core flows to the outer wall of the filter core body 404, is filtered by the filter core body 404, and then enters the central cavity of the filter core body, and then flows out from the sixth end cover.

[0062] Optionally, granular filter material can also be placed in the center cavity of the filter core body.

[0063] Preferably, in one embodiment, a second center tube 405 is installed in the center cavity, the side wall of the second center tube 405 is provided with through holes, and the second center tube 405 is provided with an opening only at one end close to the sixth end cover 403.

[0064] The end of the second center tube 405 close to the fifth end cover 402 is blocked, and the end of the second center tube 405 provided with the opening extends out of the sixth end cover 403, at this time the sixth end cover 403 can not be sealed with the inner wall of the filter cartridge, because the filtered water can be led out by the second center tube 405.

[0065] In another embodiment, a second center tube 405 is installed in the center cavity, the side wall of the second center tube 405 is provided with through holes. The second center tube 405 is in communication with the center tube 102. At this time, the two center tubes are connected as one, and the filtered water can flow out of the filter cartridge from either end.

[0066] Optionally, granular filter material is provided between the second center tube 405 and the filter core body 404, and non-woven fabric or filter screen is wound on the second center tube 405, so as to avoid leakage of the granular filter material.

[0067] Optionally, the filter material is one or a combination of several of the following: scale inhibitor, bacteriostatic agent, resin, and activated carbon.

[0068] The above describes the present application and its embodiments in a schematic manner, and the description is not restrictive, and the drawings only show one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired thereby, without departing from the spirit of the present application, similar structural modes and embodiments can be designed without creativity, and all of them should belong to the protection scope of the present application.

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 filter body is equipped with a second end cap (105) at the water inlet end, 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. 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.

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 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).

11. The composite filter element according to claim 10, 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).

12. The composite filter element according to claim 10, 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).

13. The composite filter element according to claim 12, 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).

14. The composite filter element according to claim 12, 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).

15. The composite filter element according to claim 13 or 14, 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).

16. The composite filter element according to claim 8 or 15, characterized in that: The filter media is one or a combination of scale inhibitors, antibacterial agents, resins, and activated carbon.

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