Composite filter and water purification device

Abstract

This invention discloses a composite filter element and a water purification device, relating to the field of water treatment technology. The composite filter element includes: a shell; an inlet, a first outlet, and a second outlet; a first filter unit and a second filter unit disposed within the shell; a first end cap disposed at the upper end of the first filter unit; a first flow channel formed between the first filter unit and the shell; a water inlet channel formed between the first end cap and the inner wall of the shell; the first filter unit communicating with the inlet through the first flow channel and the water inlet channel; a second flow channel disposed between the first filter unit and the first outlet, used to supply water passing through the first filter unit to the first outlet; and a third flow channel disposed between the second filter unit and the second outlet, used to supply water passing through the first filter unit and the second filter unit sequentially to the second outlet. This application can filter the input raw water to different degrees according to requirements, thereby outputting at least two different types of filtered water.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a composite filter element and a water purification device. Background Technology

[0002] As people's living standards improve, their requirements for drinking water and domestic water quality are becoming increasingly stringent. Currently, water purification devices on the market can produce drinking water through pre-filters and main filters. However, when people need domestic water, they are reluctant to use tap water for washing rice and vegetables due to its poor quality. Using fully purified water directly from a self-purifying water device for domestic use would be wasteful and would significantly reduce the lifespan of the main filter unit.

[0003] Therefore, some water purification devices currently have the function of outputting domestic water, which outputs water that has passed through the pre-filter cartridge but not the main filter unit. However, since the pre-filter cartridge has multiple filtration functions, including multiple filter units with different filtration functions, if the output domestic water passes through all the filter units in the pre-filter cartridge, the lifespan of the pre-filter cartridge will inevitably be greatly shortened. Most of the time, domestic water only needs to pass through one filter unit in the pre-filter cartridge for primary (coarse) filtration of the raw water. Therefore, there is an urgent need for a new type of filter cartridge structure that can filter the input raw water to different degrees, thereby outputting at least two different types of filtered water. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a composite filter element and a water purification device, which can filter the input raw water to different degrees according to the needs, thereby being able to output at least two different kinds of filtered water.

[0005] The specific technical solution of this invention is as follows:

[0006] A composite filter element, the composite filter element comprising:

[0007] Outer casing; water inlet, first water outlet, second water outlet;

[0008] The first and second filter units are disposed within the housing.

[0009] A first end cap is disposed at the upper end of the first filter unit; a first flow channel is formed between the first filter unit and the outer shell; a water inlet channel is formed between the first end cap and the inner wall of the outer shell; the first filter unit is connected to the water inlet through the first flow channel and the water inlet channel.

[0010] A second flow channel is provided between the first filter unit and the first outlet, the second flow channel being used to supply water passing through the first filter unit to the first outlet;

[0011] A third flow channel is provided between the second filter unit and the second outlet, the third flow channel being used to supply water that has passed through the first filter unit and the second filter unit in sequence to the second outlet.

[0012] Preferably, the first end cap includes a first cover portion and a first tube portion, and at least a portion of the second flow channel is formed between the first cover portion and the first filter unit, and the first filter unit is connected to the first tube portion and the second filter unit respectively through the second flow channel.

[0013] Preferably, the water outlet and water inlet of the first filter unit are located at the two end faces of the first filter unit, respectively.

[0014] Preferably, the outer edge of the first cover portion is sealed to the end of the outer wall of the first filter unit near the outlet of the first filter unit.

[0015] Preferably, the first filter unit is sleeved outside the second filter unit.

[0016] Preferably, the composite filter element further includes:

[0017] The support cylinder contains the second filter unit, which is disposed inside the support cylinder, and the first filter unit is sleeved outside the support cylinder; water passing through the first filter unit can flow into the interior of the support cylinder.

[0018] Preferably, a fourth flow channel is formed between the support cylinder and the outer wall of the second filter unit, so that water flowing through the first filter unit flows into the second filter unit through the fourth flow channel.

[0019] Preferably, the end of the support cylinder away from the first end cap is in a blocked state, and the end of the support cylinder near the first end cap is in an open state.

[0020] Preferably, the composite filter element further includes:

[0021] The second end cap is disposed at one end of the inlet of the first filter unit. The second end cap has an opening corresponding to the water inlet of the first filter unit, and the first flow channel is connected to the water inlet of the first filter unit through the opening.

[0022] Preferably, the second end cap includes a second cover portion, the outer edge of which is sealed to the end of the outer wall of the first filter unit near the water inlet of the first filter unit.

[0023] Preferably, the first end cap includes a first tube body portion;

[0024] The composite filter element also includes:

[0025] The third end cap includes a third cap body and a second tube body. The third cap body is disposed at the upper end of the second filter unit, and the second tube body passes through the first tube body. At least a portion of the third flow channel is formed inside the second tube body.

[0026] Preferably, the composite filter element further includes:

[0027] A central tube is inserted into the second filter unit, the central tube is connected to the second tube body, and at least part of the third flow channel is formed in the central tube and the second tube body. A through hole is provided on the side wall of part of the central tube so that the interior of the central tube is connected to the inner side wall of the second filter unit.

[0028] Preferably, water flows into the second filter unit from the outer side wall of the second filter unit for filtration and then flows out from the inner side wall of the second filter unit.

[0029] Preferably, the housing has a port;

[0030] The composite filter element further includes: a connector disposed at the port; the connector has the inlet, the first outlet and the second outlet, and the first tube body and the second tube body are connected to the connector.

[0031] A composite filter element, the composite filter element comprising:

[0032] Outer casing; water inlet, first water outlet, second water outlet;

[0033] The first and second filter units are disposed within the housing.

[0034] A first end cap is disposed at the upper end of the first filter unit; a first flow channel is formed between the first filter unit and the first end cap; a water inlet channel is formed inside the first end cap; the first filter unit is connected to the water inlet through the first flow channel and the water inlet channel.

[0035] A second flow channel is provided between the first filter unit and the first outlet, the second flow channel being used to supply water passing through the first filter unit to the first outlet;

[0036] A third flow channel is provided between the second filter unit and the second outlet, the third flow channel being used to supply water that has passed through the first filter unit and the second filter unit in sequence to the second outlet.

[0037] Preferably, the first end cap includes a first cover portion and a first tube portion, wherein at least a portion of the first flow channel is formed between the first cover portion and the first filter unit, and at least a portion of the water inlet channel is formed within the first tube portion.

[0038] Preferably, the water outlet and water inlet of the first filter unit are located at the two end faces of the first filter unit, respectively.

[0039] Preferably, the housing has an axis, and the first filter element and the second filter element are arranged along the axis.

[0040] Preferably, the composite filter element further includes:

[0041] A support cylinder, wherein the first filter unit is sleeved outside the support cylinder, at least a portion of the support cylinder passes through the first tube body portion, and at least a portion of the second flow channel is formed inside the support cylinder;

[0042] At least a portion of the second flow channel is formed between the end of the first filter unit and the end of the second filter unit;

[0043] The second end cap is disposed at one end of the water outlet of the first filter unit. The second end cap has an opening corresponding to the water outlet of the first filter unit, and the water outlet of the first filter unit is connected to the second flow channel through the opening.

[0044] Preferably, the composite filter element further includes: a central tube, which passes through the support cylinder and the second filter unit, and at least a portion of the third flow channel is formed inside the central tube. At least a portion of the second flow channel is formed between the outer sidewall of the central tube and the inner sidewall of the support cylinder. A through hole is provided on a portion of the sidewall of the central tube so that the interior of the central tube communicates with the inner sidewall of the second filter unit.

[0045] Preferably, a fourth flow channel is formed between the outer wall of the second filter unit and the outer shell; water flowing out of the first filter unit flows into the outer wall of the second filter unit through the fourth flow channel.

[0046] Preferably, the housing includes ports;

[0047] The composite filter element further includes: a connector disposed at the port; the connector has the inlet, the first outlet and the second outlet, and the first tube body, the support cylinder and the central tube are connected to the connector.

[0048] Preferably, the outer wall of the first filter unit is sealed.

[0049] Preferably, the outer casing has two opposite ends, and the water inlet, the first water outlet, and the second water outlet are located at the same end of the outer casing.

[0050] Preferably, the first filter unit is made of PP cotton filter material.

[0051] Preferably, the second filter unit is made of activated carbon material.

[0052] Preferably, the second filter unit includes at least one of the following: carbon particles, carbon fibers, and carbon rods.

[0053] Preferably, the first filtering unit includes:

[0054] At least one filter leaf unit is wound on the support cylinder. The filter leaf unit has a raw water side and a clean water side. Raw water can only pass through the filter leaf unit from the raw water side to the clean water side of the filter leaf unit to form clean water.

[0055] In the unfolded state of the filter page unit, the filter page unit includes a first filter page and a second filter page stacked together. The first filter page and the second filter page have opposite upper and lower sides, and opposite left and right sides, respectively. When the first filter unit is filtering, raw water flows into the raw water side from the upper side of the first filter page and the second filter page, passes through the filter page unit, enters the purified water side, and flows out through the lower side of the first filter page and the second filter page.

[0056] Preferably, the first filter unit further includes a water-resistant layer wound around the outside of the filter page unit.

[0057] A water purification device, the water purification device comprising: a composite filter element as described in any of the above.

[0058] Preferably, the water purification device further includes: a water inlet path, which is connected to the water inlet;

[0059] The first water output channel is connected to the first water outlet.

[0060] A fine filter element, wherein the inlet of the fine filter element is connected to the second water outlet;

[0061] The second water output channel is connected to the outlet of the fine filter element.

[0062] Preferably, the composite filter element further includes a return water inlet, which is connected to the water inlet of the second filter unit or the water inlet of the first filter unit;

[0063] The water purification device further includes: a return water path, one end of which is connected to the outlet of the fine filter element, and the other end of which is connected to the return water inlet of the composite filter element;

[0064] A first check valve is installed on the return water line, which connects the outlet of the fine filter element to the return water port of the composite filter element.

[0065] Preferably, a pressure switch and a second check valve located upstream of the pressure switch are provided on the first water output line, and the second check valve can be opened from upstream to downstream of the first water output line.

[0066] The technical solution of the present invention has the following significant beneficial effects:

[0067] The composite filter element in this application can filter raw water input from the inlet to different degrees using different water paths, thus enabling the output of first-filtered water (filtered only by the first filter unit) from the first outlet and second-filtered water (filtered by both the first and second filter units) from the second outlet. This reduces the lifespan of the second filter unit and significantly extends the overall lifespan of the composite filter element. Furthermore, by designing the internal structure of the composite filter element to output two different types of filtered water using only one element, the size of the water purification device can be effectively reduced, eliminating the need for two separate filter elements: one with the first filter unit and one with the second filter unit.

[0068] Specific embodiments of the invention are disclosed in detail below with reference to the description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0069] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0070] Figure 1 This is a cross-sectional view of the composite filter element in the first embodiment of the present invention;

[0071] Figure 2 This is a cross-sectional view of the composite filter element in the second embodiment of the present invention;

[0072] Figure 3 for Figure 1 A schematic diagram of the water path when the composite filter cartridge outputs the first type of filtered water;

[0073] Figure 4 for Figure 1 A schematic diagram of the water path when the composite filter cartridge outputs the second type of filtered water;

[0074] Figure 5 for Figure 1 Exploded view of a composite filter element;

[0075] Figure 6 for Figure 1 A schematic diagram of the structure of the first end cap;

[0076] Figure 7 for Figure 1 Schematic diagram of the structure of the second end cap;

[0077] Figure 8 for Figure 1 Schematic diagram of the structure of the third end cap;

[0078] Figure 9 for Figure 1 Schematic diagram of the middle support cylinder;

[0079] Figure 10 for Figure 1 Schematic diagram of the middle connector;

[0080] Figure 11 This is a schematic diagram of the filter page unit in the unfolded state in an embodiment of the present invention;

[0081] Figure 12 This is a top view schematic diagram of multiple filter page units wound on a support cylinder in an embodiment of the present invention;

[0082] Figure 13 This is a schematic diagram of the water purification device in an embodiment of the present invention.

[0083] The reference numerals in the above figures are as follows:

[0084] 1. Inlet; 2. First outlet; 3. Second outlet; 4. Outer shell; 5. First filter unit; 51. Filter leaf unit; 511. First filter leaf; 512. Second filter leaf; 513. Top side; 514. Bottom side; 515. Left side; 516. Right side; 517. Raw water side; 518. Clean water side; 52. Water barrier; 6. Second filter unit; 7. First end cap; 71. First cover body; 72. First tube body; 73. Reinforcing rib; 8. First flow channel; 9. Inlet channel; 10. Second flow channel; 11. Third flow channel; 12. Support cylinder; 121. Limiting part; 13. Fourth flow channel ; 14. Second end cap; 141. Opening; 15. Central tube; 16. Connector; 17. Third end cap; 171. Third cap body; 172. Second tube body; 18. Fourth end cap; 19. Return water port; 100. Composite filter element; 200. First water output channel; 300. Fine filter element; 400. Second water output channel; 500. Return water channel; 600. First check valve; 700. Wastewater channel; 800. Combination valve; 900. Post-filter unit; 1000. Pressure switch; 1100. Flow sensor; 1200. Second check valve; 1300. Inlet valve; 1400. Booster device. Detailed Implementation

[0085] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0086] 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 to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0087] In order to filter the input raw water to different degrees according to requirements, thereby outputting at least two different types of filtered water, a composite filter element is proposed in this application embodiment. Figure 1 This is a cross-sectional view of the composite filter element in the first embodiment of the present invention, as shown below. Figure 1 As shown, the composite filter element 100 includes: a housing 4; an inlet 1, a first outlet 2, and a second outlet 3; a first filter unit 5 and a second filter unit 6 disposed within the housing 4; a first end cap 7 disposed at the upper end of the first filter unit 5; a first flow channel 8 formed between the first filter unit 5 and the housing 4; a water inlet channel 9 formed between the first end cap 7 and the inner wall of the housing 4; the first filter unit 5 being connected to the inlet 1 through the first flow channel 8 and the water inlet channel 9; a second flow channel 10 disposed between the first filter unit 5 and the first outlet 2, the second flow channel 10 being used to supply water passing through the first filter unit 5 to the first outlet 2; and a third flow channel 11 disposed between the second filter unit 6 and the second outlet 3, the third flow channel 11 being used to supply water passing through the first filter unit 5 and the second filter unit 6 sequentially to the second outlet 3.

[0088] Figure 3 for Figure 1 A schematic diagram of the water path when the composite filter cartridge outputs the first type of filtered water is shown below. Figure 3 As shown, when only the first filtered water after filtration by the first filter unit 5 is needed, the raw water flows in from the inlet 1, passes through the inlet channel 9 formed between the first end cap 7 and the inner wall of the outer shell 4, and then enters the first flow channel 8 formed between the first filter unit 5 and the outer shell 4. After entering the first filter unit 5 for filtration, the first filtered water is obtained. The first filtered water flows through the second flow channel 10 to the first outlet 2, and is thus output from the composite filter element 100. Figure 4 for Figure 1 A schematic diagram of the water circuit when the composite filter cartridge outputs the second type of filtered water, as shown below. Figure 4As shown, when the second filtered water needs to be filtered by the first filter unit 5 and the second filter unit 6, the raw water flows in from the inlet 1, passes through the water inlet channel 9 formed between the first end cap 7 and the inner wall of the outer shell 4, and then enters the first flow channel 8 formed between the first filter unit 5 and the outer shell 4. After that, it enters the first filter unit 5 for filtration to obtain the first filtered water. The first filtered water then passes through the second filter unit 6 for filtration to obtain the second filtered water. The second filtered water flows through the third flow channel 11 set between the second filter unit 6 and the second outlet 3 to the second outlet 3, and finally is output from the composite filter element 100.

[0089] Another composite filter element is also proposed in the embodiments of this application. Figure 2 This is a cross-sectional view of the composite filter element in the second embodiment of the present invention, as shown below. Figure 2 As shown, the composite filter element may include: a housing 4; an inlet 1, a first outlet 2, and a second outlet 3; a first filter unit 5 and a second filter unit 6 disposed within the housing 4; a first end cap 7 disposed at the upper end of the first filter unit 5; a first flow channel 8 formed between the first filter unit 5 and the first end cap 7; an inlet channel 9 formed inside the first end cap 7; the first filter unit 5 communicating with the inlet 1 through the first flow channel 8 and the inlet channel 9; a second flow channel 10 disposed between the first filter unit 5 and the first outlet 2, the second flow channel 10 being used to supply water passing through the first filter unit 5 to the first outlet 2; and a third flow channel 11 disposed between the second filter unit 6 and the second outlet 3, the third flow channel 11 being used to supply water passing through the first filter unit 5 and the second filter unit 6 sequentially to the second outlet 3.

[0090] When only the first filtered water after passing through the first filter unit 5 is needed, the raw water flows in from the inlet 1, passes through the inlet channel 9 formed inside the first end cap 7, and then enters the first flow channel 8 formed between the first filter unit 5 and the first end cap 7. It then enters the first filter unit 5 for filtration to obtain the first filtered water. The first filtered water flows through the second flow channel 10 to the first outlet 2, and is thus output from the composite filter element 100. When the second filtered water after passing through the first filter unit 5 and the second filter unit 6 is needed, the raw water flows in from the inlet 1, passes through the inlet channel 9 formed inside the first end cap 7, and then enters the first flow channel 8 formed between the first filter unit 5 and the first end cap 7. It then enters the first filter unit 5 for filtration to obtain the first filtered water. The first filtered water then passes through the second filter unit 6 for filtration to obtain the second filtered water. The second filtered water flows through the third flow channel 11 set between the second filter unit 6 and the second outlet 3 to the second outlet 3, and is finally output from the composite filter element 100.

[0091] In the two embodiments described above, the composite filter element in this application can filter the raw water input from the inlet 1 to different degrees using different water paths, as needed. This allows it to output first filtered water (filtered only by the first filter unit 5) from the first outlet 2 and second filtered water (filtered by both the first filter unit 5 and the second filter unit 6) from the second outlet 3. This reduces the wear and tear on the second filter unit 6 and significantly increases the overall lifespan of the composite filter element. Furthermore, by designing the internal structure of the composite filter element to output two different types of filtered water using only one element, the volume of the water purification device with the composite filter element can be effectively reduced, eliminating the need for two separate filter elements: one with the first filter unit 5 and one with the second filter unit 6.

[0092] To better understand this composite filter element, further explanation and description will follow. Figure 1 and Figure 2 As shown, the composite filter element may include: a housing 4; an inlet 1; a first outlet 2; a second outlet 3; a first filter unit 5; a second filter unit 6; and a first end cap 7. The housing 4 is the shell of the composite filter element, and an internal cavity is formed therein. The first filter unit 5, the second filter unit 6, and the first end cap 7 are all disposed within the cavity of the housing 4.

[0093] like Figure 1 As shown, the first filter unit 5 can be sleeved outside the second filter unit 6. The first end cap 7 is located at the upper end of the first filter unit 5, that is, at the end of the first filter unit 5 near the water inlet 1. Therefore, the first end cap 7 can form a water inlet channel 9 with the inner wall of the outer casing 4, and the water inlet channel 9 is directly connected to the water inlet 1.

[0094] like Figure 1 and Figure 3 As shown, a first flow channel 8 is formed between the first filter unit 5 and the outer casing 4. The first filter unit 5 is generally tubular, and the first flow channel 8 is formed between the outer side wall of the first filter unit 5 and the inner side wall of the outer casing 4. The first filter unit 5 is connected to the inlet 1 through the first flow channel 8 and the water inlet channel 9. Raw water flows in from the inlet 1, passes through the water inlet channel 9 formed between the first end cap 7 and the inner wall of the outer casing 4, and then enters the first flow channel 8 formed between the first filter unit 5 and the outer casing 4. After that, it enters the first filter unit 5 for filtration to obtain the first filtered water.

[0095] There is a second flow channel 10 between the first filter unit 5 and the first water outlet 2. Water passing through the first filter unit 5 can be supplied to the first water outlet 2 through the second flow channel 10, that is, the first filtered water can flow out from the first water outlet 2 through the second flow channel 10.

[0096] like Figure 4As shown, the first filtered water can continue to flow into the second filter unit 6 for filtration to obtain the second filtered water. There is a third flow channel 11 between the second filter unit 6 and the second outlet 3. The third flow channel 11 can be used to supply water that has passed through the first filter unit 5 and the second filter unit 6 in sequence to the second outlet 3. That is, the second filtered water can flow out from the second outlet 3 through the third flow channel 11.

[0097] As a feasible option, such as Figure 1 As shown, the outer casing 4 has two opposite ends, with the inlet 1, the first outlet 2, and the second outlet 3 located at the same end of the outer casing 4. This structure facilitates the assembly of the composite filter element with the water purification device, enabling water circulation. Of course, in other feasible embodiments, the inlet 1, the first outlet 2, and the second outlet 3 may not be located at the same end of the outer casing 4, but rather at either end, depending on the specific requirements.

[0098] As a feasible option, Figure 6 for Figure 1 A schematic diagram of the structure of the first end cap is shown below. Figure 6 As shown, the first end cap 7 may include a first cap body portion 71 and a first tube body portion 72. For example... Figure 1 , Figure 3 and Figure 4 As shown, a water inlet channel 9 is formed between the end face of the first cover portion 71 facing away from the first filter unit 5, the outer wall of the first tube portion 72, and the inner wall of the outer casing 4. At least a partial second flow channel 10 is formed between the first cover portion 71 and the first filter unit 5. Specifically, at least a partial second flow channel 10 is formed between the end face of the first cover portion 71 facing the first filter unit 5 and the first filter unit 5. At least a partial second flow channel 10 is formed inside the first tube portion 72, and this partial second flow channel 10 communicates with the first outlet 2. The first filter unit 5 is connected to both the at least partial second flow channel 10 formed inside the first tube portion 72 and the second filter unit 6 via the at least partial second flow channel 10 formed between the first cover portion 71 and the first filter unit 5. The first filtered water obtained after filtration by the first filter unit 5 can flow through the second flow channel 10 formed between the first cover portion 71 and the first filter unit 5 to the second flow channel 10 formed inside the first tube portion 72 or the second filter unit 6.

[0099] In order to isolate the second flow channel 10 from the first flow channel 8 and prevent the first filtered water from mixing with the raw water in the first flow channel 8, the outer edge of the first cover portion 71 is sealed to the end of the outer wall of the first filter unit 5 near the water outlet of the first filter unit 5.

[0100] As a feasible option, the water outlet and water inlet of the first filter unit 5 are located at the two end faces of the first filter unit 5, respectively. Figure 3As shown, the water outlet of the first filter unit 5 can be located at the end face facing the first cover portion 71, and the water inlet of the first filter unit 5 can be located at the end face away from the first cover portion 71. Raw water flows into the first filter unit 5 from the end face away from the first cover portion 71, then flows upward and is filtered in the first filter unit 5, and finally flows out from the end face of the first filter unit 5 facing the first cover portion 71 to obtain the first filtered water.

[0101] To prevent raw water from flowing out of the outer wall of the first filter unit 5 and into the first flow channel 8 during filtration, it is feasible to seal the outer wall of the first filter unit 5.

[0102] like Figure 1 As shown, the composite filter element may include: a second end cap 14, which is disposed at one end of the water inlet of the first filter unit 5, and the second end cap 14 is used to support and fix the lower end of the first filter unit 5. Figure 7 for Figure 1 A schematic diagram of the structure of the second end cap is shown below. Figure 7 As shown, the second end cap 14 has an opening 141 corresponding to the water inlet of the first filter unit 5, and the first flow channel 8 is connected to the water inlet of the first filter unit 5 through the opening 141. There can be multiple openings 141, which are circumferentially distributed around the center of the second end cap 14 to ensure that water can enter the first filter unit 5 at multiple positions, so as to ensure the water flow rate.

[0103] To prevent water flowing from the first flow channel 8 into the opening 141 from flowing back into the first flow channel 8, the second end cap 14 may include a second cap body portion, the outer edge of which is sealed to the end of the outer wall of the first filter unit 5 near the water inlet portion of the first filter unit 5. For example, sealing can be achieved by applying adhesive, which also serves to fix the lower part of the first filter unit 5.

[0104] As a feasible option, such as Figure 7 As shown, the second cover portion of the second end cap 14 has multiple raised reinforcing ribs extending in the radial direction on the end face of the water inlet portion of the first filter unit 5, thereby creating a gap between the second cover portion and the water inlet portion of the first filter unit 5. Water flowing into the opening 141 can be dispersed and flow into the first filter unit 5 from a larger area of ​​the water inlet portion of the first filter unit 5, thereby increasing the water inlet flow rate.

[0105] When the first filter unit 5 is fitted outside the second filter unit 6, as a feasible solution for supporting the first filter unit 5, Figure 9 for Figure 1 A schematic diagram of the structure of the middle support cylinder is shown below. Figure 1 , Figure 3 , Figure 4 and Figure 9 As shown, the composite filter element may include: a support cylinder 12, a second filter unit 6 disposed inside the support cylinder 12, and a first filter unit 5 sleeved outside the support cylinder 12. The support cylinder 12 may be made of a rigid material to provide it with sufficient strength and rigidity to meet the support purpose. The end of the support cylinder 12 away from the first end cap 7 is sealed, while the end of the support cylinder 12 near the first end cap 7 is open. A gap exists between the upper end of the support cylinder 12 and the first cover portion 71 of the first end cap 7, forming a partial second flow channel 10. Water passing through the first filter unit 5 can flow into the interior of the support cylinder 12 after passing through the second flow channel 10.

[0106] Furthermore, such as Figure 1 and Figure 4 As shown, a fourth flow channel 13 is formed between the support cylinder 12 and the outer wall of the second filter unit 6, so that water flowing through the first filter unit 5 flows into the second filter unit 6 through the fourth flow channel 13. Specifically, the first filtered water obtained after filtration by the first filter unit 5 can flow into the second filter unit 6 from the outer wall of the second filter unit 6 or from the lower end face of the second filter unit 6. The second filtered water obtained after filtration by the second filter unit 6 can flow out from the inner wall of the second filter unit 6 or from the upper end face of the second filter unit 6. The above-mentioned methods of the first filtered water flowing into the second filter unit 6 and the methods of the second filtered water flowing out of the second filter unit 6 can be arbitrarily combined, depending on the shape of the second filter unit 6. The second filter unit 6 can be tubular, columnar, or columnar at the bottom and tubular at the top, etc., and its shape is not specifically limited in this application.

[0107] like Figure 9 As shown, in order to ensure that there is a relatively uniform gap in the circumferential direction between the inner wall of the support cylinder 12 and the outer wall of the second filter unit 6, so that the formed fourth flow channel 13 can be filled with water at various positions on the outer wall of the second filter unit 6 and increase the water flow rate, the inner wall of the support cylinder 12 has a plurality of limiting parts 121 extending in the axial direction to prevent a certain part of the outer wall of the second filter unit 6 from being tightly attached to the support cylinder 12.

[0108] As a feasible option, such as Figure 7 As shown, the reinforcing rib on the second end cap 14 may have a first portion away from the center of the second end cap and a second portion close to the second end cap. The first portion of the reinforcing rib of the second end cap 14 abuts against the end face of the first filter unit 5, and the second portion of the reinforcing rib of the second end cap 14 abuts against the end face of the support cylinder 12. The height of the first portion of the reinforcing rib of the second end cap 14 is greater than the height of the second portion of the reinforcing rib of the second end cap 14. In this way, the first portion of the reinforcing rib of the second end cap 14 can limit the support cylinder 12 in the radial direction to prevent it from shaking.

[0109] As a feasible option, such as Figure 1 and Figure 7 As shown, the second end cap 14 has a protrusion on the end face opposite to the first filter unit 5. The protrusion allows for a gap between the end face of the second end cap 14 opposite to the first filter unit 5 and the outer shell 4, thereby ensuring that water between the outer wall of the first filter unit 5 and the inner wall of the outer shell 4 can flow to the space between the end face of the second end cap 14 opposite to the first filter unit 5 and the outer shell 4, and then enter the water inlet of the first filter unit 5 through the opening 141 of the second end cap 14.

[0110] As a feasible option, such as Figure 1 and Figure 4 As shown, the composite filter element may include: a third end cap 17, which discharges the second filtered water obtained from the second filtration unit 6. Figure 8 for Figure 1 A schematic diagram of the structure of the third end cap is shown below. Figure 8 As shown, the third end cap 17 may include a third cap portion 171 and a second tube portion 172. The third cap portion 171 is disposed at the upper end of the second filter unit 6, thereby sealing the upper end face of the second filter unit 6 and ensuring that water in the second flow channel 10 cannot mix with the second filtered water through the gap between the third cap portion 171 and the upper end face of the second filter unit 6. The second tube portion 172 passes through the first tube portion 72, and at least a portion of the third flow channel 11 is formed within the second tube portion 172. The second filtered water is discharged to the second outlet 3 through the third flow channel 11 formed within the second tube portion 172.

[0111] In other feasible embodiments, the third cover portion 171 can be disposed at the lower end of the second filter unit 6, thereby sealing the lower end face of the second filter unit 6 and ensuring that the water in the second flow channel 10 cannot mix with the second filtered water through the gap between the third cover portion 171 and the lower end face of the second filter unit 6. The second tube portion 172 extends downward through the cylinder and the second end cap 14, and the second water outlet 3 is located at the lower end of the outer casing 4.

[0112] In order to provide internal support for the second filter unit 6, such as Figure 1 , Figure 3 and Figure 4As shown, the composite filter element may include a central tube 15 inserted into the second filter unit 6. The central tube 15 communicates with the second tube body portion 172. The upper end of the central tube 15 may abut against the third cover portion 171, and the interior of the central tube 15 is opposite to the second tube body portion 172. At least a portion of the third flow channel 11 is formed within the central tube 15 and the second tube body portion 172, and at least a portion of the sidewall of the central tube 15 has a through hole to connect the interior of the central tube 15 with the inner sidewall of the second filter unit 6. In this structure, water flows into the second filter unit 6 from the outer sidewall for filtration and then flows out from the inner sidewall of the second filter unit 6.

[0113] Furthermore, the composite filter element may include a fourth end cap 18, which can be disposed at the lower or upper end of the second filter unit 6, thereby sealing the lower or upper end of the second filter unit 6. This ensures that water in the fourth flow channel 13 cannot mix with the second filtered water through the gap between the lower or upper end face of the second filter unit 6 and the support cylinder 12. The fourth end cap 18 can seal the entire lower or upper end face of the second filter unit 6, or it can seal the lower or upper end of the second filter unit 6 by its outer edge.

[0114] As a feasible option, Figure 5 for Figure 1 An exploded view of a composite filter element, as shown below. Figure 5 As shown, the outer casing 4 may have a port. The composite filter element may include a connector 16 disposed at the port. When the composite filter element is installed on a water purification device, the connector 16 is used to connect the composite filter element to the water purification device, thereby achieving communication between the various water channels. The connector 16 has an inlet 1, a first outlet 2, and a second outlet 3, and a first tube portion 72 and a second tube portion 172 are connected to the connector 16. Figure 1 As shown, the first tube portion 72 and the second tube portion 172 can be connected to the connector 16 by plugging. When the first tube portion 72 and the second tube portion 172 are connected to the connector 16, the water inlet 1 communicates with the water inlet channel 9 formed between the first end cap 7 and the inner wall of the outer shell 4, the first water outlet 2 communicates with the portion of the second flow channel 10 formed between the inner side wall of the first tube portion 72 and the outer side wall of the second tube portion 172, and the second water outlet 3 communicates with the portion of the third flow channel 11 formed by the inner side wall of the second tube portion 172.

[0115] In the above embodiments, since the first filter unit 5 is sleeved outside the second filter unit 6, the axial length of the composite filter element can be greatly reduced.

[0116] like Figure 2As shown, the outer casing 4 may have an axis, with the first filter element and the second filter element 6 arranged along the axis. Alternatively, the outer casing 4 may have two opposite ends, with the inlet 1, the first outlet 2, and the second outlet 3 located at the same end of the outer casing 4. This structure facilitates the assembly of the composite filter element with the water purification device, enabling water circulation. Of course, in other feasible embodiments, the inlet 1, the first outlet 2, and the second outlet 3 may not be located at the same end of the outer casing 4, but rather at opposite ends, depending on the specific requirements. For example, the inlet 1 and the first outlet 2 may be located at the upper end of the outer casing 4, and the second outlet 3 may be located at the lower end of the outer casing 4.

[0117] like Figure 2 As shown, the first end cap 7 is located at the upper end of the first filter unit 5, that is, at the end of the first filter unit 5 near the water inlet 1. A water inlet channel 9 can be formed inside the first end cap 7, which can directly communicate with the water inlet 1. A first flow channel 8 is formed between the first filter unit 5 and the first end cap 7, and the first flow channel 8 is connected to the water inlet 1 through the water inlet channel 9. Raw water flows in from the water inlet 1, passes through the water inlet channel 9 formed inside the first end cap 7, and then enters the first flow channel 8 formed between the first filter unit 5 and the first end cap 7. Afterward, it enters the first filter unit 5 for filtration to obtain first filtered water. A second flow channel 10 is provided between the first filter unit 5 and the first water outlet 2. Water passing through the first filter unit 5 can be supplied to the first water outlet 2 through the second flow channel 10, that is, the first filtered water can flow out from the first water outlet 2 through the second flow channel 10. The first filtered water can also continue to flow into the second filter unit 6 for filtration to obtain second filtered water. The second filter unit 6 has a third flow channel 11 between its outlet and the second outlet 3. The third flow channel 11 can be used to supply water that has passed through the first filter unit 5 and the second filter unit 6 in sequence to the second outlet 3. That is, the second filtered water can flow out of the second outlet 3 through the third flow channel 11.

[0118] As a feasible option, such as Figure 2 As shown, the first end cap 7 may include a first cap portion 71 and a first tube portion 72. At least a portion of a first flow channel 8 is formed between the first cap portion 71 and the first filter unit 5. A water inlet channel 9 is formed within the first tube portion 72. Specifically, the first flow channel 8 is formed between the end face of the first cap portion 71 facing the first filter unit 5 and the first filter unit 5.

[0119] As a feasible option, such as Figure 2As shown, the water outlet and water inlet of the first filter unit 5 are located at two end faces of the first filter unit 5, respectively. The water inlet of the first filter unit 5 can be located at the end face facing the first cover portion 71, and the water outlet of the first filter unit 5 can be located at the end face away from the first cover portion 71. Raw water flows into the first filter unit 5 from the end face facing the first cover portion 71, then flows downward and is filtered in the first filter unit 5, and finally flows out from the end face of the first filter unit 5 away from the first cover portion 71 to obtain the first filtered water.

[0120] To prevent raw water from flowing out from the outer wall of the first filter unit 5 during filtration, it is feasible to seal the outer wall of the first filter unit 5. Of course, in this embodiment, the first filtered water obtained when the raw water is filtered in the first filter unit 5 can also flow out from the outer wall of the first filter unit 5.

[0121] In order to separate the space between the outer wall of the first flow channel 8 and the outer wall of the first filter unit 5 and the inner wall of the outer casing 4, and to prevent the first filtered water from mixing with the raw water in the first flow channel 8, the outer edge of the first cover portion 71 is sealed to the end of the outer wall of the first filter unit 5 near the water inlet of the first filter unit 5.

[0122] As a feasible option, such as Figure 2 As shown, the composite filter element may include: a second end cap 14, which is disposed at one end of the water outlet of the first filter unit 5. The second end cap 14 is used to support and fix the lower end of the first filter unit 5. The second end cap 14 has an opening 141 corresponding to the water outlet of the first filter unit 5, and the first filtered water obtained after filtration by the first filter unit 5 flows out through the opening 141. There can be multiple openings 141, which are circumferentially distributed around the center of the second end cap 14 to ensure that water can flow out from the water outlet of the first filter unit 5 at all positions, thereby ensuring the water flow rate.

[0123] like Figure 2As shown, the composite filter element may include a support cylinder 12. A first filter unit 5 is sleeved on the support cylinder 12, and at least a portion of the support cylinder 12 passes through the first tube body 72. The support cylinder 12 may be made of a rigid material to provide it with sufficient strength and rigidity to support the first filter unit 5. At least a portion of a second flow channel 10 is formed inside the support cylinder 12, and the second flow channel 10 communicates with the first outlet 2. A gap exists between the end of the first filter unit 5 and the end of the second filter unit 6, thereby forming at least a portion of the second flow channel 10. At least a portion of a water inlet channel 9 is formed between the inner wall of the first tube body 72 and the outer wall of the support cylinder 12. The first filtered water flowing out from the opening 141 flows into the second flow channel 10 formed inside the support cylinder 12 through the second flow channel 10 between the end of the first filter unit 5 and the end of the second filter unit 6, and after flowing out of the support cylinder 12, finally flows out from the first outlet 2.

[0124] The first filtered water flowing out of opening 141 can also flow into the second filter unit 6. The first filtered water can flow into the second filter unit 6 from its outer wall and out from its inner wall or lower end face, or it can flow into the second filter unit 6 from its upper end face and out from its lower end face, inner wall, or outer wall. Simply separating the inlet of the first filtered water into the second filter unit 6 from its outlet is sufficient.

[0125] As a feasible method, when the first filtered water can flow into the second filter unit 6 from the outer wall of the second filter unit 6 for filtration, such as Figure 2 As shown, the outer wall of the second filter unit 6 can form a fourth flow channel 13 between itself and the outer casing 4. Water flowing out of the first filter unit 5 flows into the outer wall of the second filter unit 6 through the portion of the second flow channel 10 and the fourth flow channel 13 between the end of the first filter unit 5 and the end of the second filter unit 6. The outer wall of the second filter unit 6 is the water inlet of the second filter unit 6.

[0126] like Figure 2 As shown, the composite filter element may include a central tube 15. The central tube 15 passes through the second filter unit 6, and the inner wall of the second filter unit 6 is the water outlet of the second filter unit 6. The side wall of the central tube 15 has a through hole so that the interior of the central tube 15 communicates with the inner wall of the second filter unit 6.

[0127] In one embodiment, the central tube 15 can extend downward beyond the outer casing 4, and at least a portion of the third flow channel 11 is formed inside the central tube 15, thereby communicating with the second outlet 3. At this time, the second outlet 3 is located at the lower end of the outer casing 4, and the inlet 1 and the first outlet 2 are located at the upper end of the outer casing 4.

[0128] In another implementation, such as Figure 2As shown, the central tube 15 can pass through the support cylinder 12 and the second filter unit 6, and at least a portion of the third flow channel 11 is formed inside the central tube 15, thereby communicating with the second outlet 3. At least a portion of the second flow channel 10 is formed between the outer wall of the central tube 15 and the inner wall of the support cylinder 12. In order to ensure that there is a relatively uniform gap in the circumferential direction between the inner wall of the support cylinder 12 and the outer wall of the central tube 15, so that the formed second flow channel 10 can uniformly transport water in the circumferential direction and increase the inlet flow rate, the inner wall of the support cylinder 12 has a plurality of limiting portions 121 extending in the axial direction to prevent a part of the outer wall of the central tube 15 from being tightly attached to the support cylinder 12.

[0129] A portion of the central tube 15 has through holes on its sidewalls to allow the interior of the central tube 15 to communicate with the inner sidewall of the second filter unit 6. In this embodiment, the second outlet 3, the inlet 1, and the first outlet 2 are located at the upper end of the housing 4. Correspondingly, the housing 4 may include a port. The composite filter element may include: a connector 16 disposed at the port; the connector 16 has an inlet 1, a first outlet 2, and a second outlet 3, and the first tube body 72, the support cylinder 12, and the central tube 15 are connected to the connector 16. The first tube body 72, the support cylinder 12, and the central tube 15 can be connected to the connector 16 by insertion.

[0130] When the first filtered water can flow into the second filter unit 6 from the outer wall of the second filter unit 6 for filtration, and the filtered second filtered water flows out from the inner wall of the second filter unit 6, it is feasible to, for example... Figure 2 As shown, the composite filter element may include a third end cap 17 and a fourth end cap 18. The third end cap 17 is disposed on the upper end face of the second filter unit 6 to seal it, and the fourth end cap 18 is disposed on the lower end face of the second filter unit 6 to seal it, thereby ensuring that the first filtered water flows into the second filter unit 6 from the outer wall of the second filter unit 6, and the second filtered water flowing out of the second filter unit 6 enters the central tube 15. When the second outlet 3, the inlet 1, and the first outlet 2 are located at the upper end of the outer casing 4, the central tube 15 passes through the third end cap 17, and the lower end of the central tube 15 can abut against the fourth end cap 18, thereby sealing the lower end of the central tube 15.

[0131] In the above embodiments, since the first filter element and the second filter unit 6 are arranged along the axial direction, the radial width of the composite filter element can be greatly reduced.

[0132] In all the above embodiments, the first filtration unit 5 can be made of a material capable of performing (coarse) primary filtration of the raw water, and the resulting first filtered water can be used as domestic water, such as for washing vegetables and rice, etc., and no limitations are imposed on it in this application. The second filtration unit 6 can be made of a material capable of performing other functions of filtration on the first filtered water, and the resulting second filtered water can be input into the downstream fine filter cartridge 300, and after being filtered by the fine filter cartridge 300, drinking water for users is obtained.

[0133] As an option, the first filter unit 5 can be made of PP cotton filter material, or other materials with primary filtration function can be used.

[0134] Alternatively, the second filter unit 6 can be made of activated carbon material, thereby removing organic matter from the water, and its filtration function differs from that of the first filter unit 5. The second filter unit 6 can take different forms, for example, the second filter unit 6 may include at least one of the following: carbon particles, carbon fibers, and carbon rods, etc.

[0135] When the first filter unit 5 is made of PP cotton filter material and the second filter unit 6 is made of activated carbon material, under the same conditions, the service life of the first filter unit 5 far exceeds that of the second filter unit 6. If the output domestic water passes through both the first filter unit 5 and the second filter unit 6 in the composite filter cartridge, the second filter unit 6 will inevitably fail quickly. Therefore, the lifespan of the composite filter cartridge will be greatly shortened, and the replacement frequency will increase significantly. When domestic water only needs to pass through the first filter unit 5 in the composite filter cartridge, it not only meets the needs of domestic water but also greatly extends the service life of the composite filter cartridge.

[0136] In all the above embodiments, such as Figure 6 As shown, the first end cap 7 has multiple raised, radially extending reinforcing ribs 73 on its end face facing the first filter unit 5. In one embodiment, the gap between adjacent reinforcing ribs 73 can form at least a portion of the second flow channel 10. In another embodiment, the gap between adjacent reinforcing ribs 73 can form at least a portion of the first flow channel 8. When the first end cap 7 and the first filter unit 5 are installed together, the installation efficiency between the two can be improved. Even if the end face of the first filter unit 5 directly abuts against the first end cap 7, a flow channel can still be formed, without having to consider the problem of the flow channel disappearing.

[0137] In all the above embodiments, as feasible, such as Figure 1 , Figure 2 and Figure 5As shown, the outer casing 4 can be assembled from at least two parts, so that components such as the first filter unit 5, the second filter unit 6, the end cap, the central tube 15, and the support cylinder 12 can be installed inside the outer casing 4.

[0138] In all the above embodiments, in order to significantly increase the water-passing area of ​​the first filter unit 5 and thus improve the filtration efficiency of the first filter unit 5, the first filter unit 5 can adopt the following structure as a feasible option. Figure 11 This is a schematic diagram of the filter page unit in the unfolded state in an embodiment of the present invention, as shown below. Figure 11 As shown, it may include: at least one filter page unit 51 wound on the support cylinder 12, the filter page unit 51 having a raw water side 517 and a purified water side 518, the raw water can only pass through the filter page unit 51 from the raw water side 517 to the purified water side 518 to form purified water; in the unfolded state of the filter page unit 51, the filter page unit 51 includes a stacked first filter page 511 and a second filter page 512, the first filter page 511 and the second filter page 512 respectively have opposite upper sides 513 and lower sides 514, and opposite left sides 515 and right sides 516; when the first filter unit 5 is filtering, the raw water flows into the raw water side 517 from the upper side 513 of the first filter page 511 and the second filter page 512, passes through the filter page unit 51, enters the purified water side 518, and flows out through the lower side 514 of the first filter page 511 and the second filter page 512.

[0139] When the first filter unit 5 filters water, raw water enters from the upper side 513 of the first filter page 511 and the second filter page 512. As the raw water flows from the upper side 513 of the first filter page 511 and the second filter page 512 to the lower side 514 of the first filter page 511 and the second filter page 512, it passes through the filter page unit 51 and enters the purified water side 518. The entire surface of one side of the first filter page 511 and the second filter page 512 can form a water-passing area, thus significantly increasing the water-passing area of ​​the first filter unit 5.

[0140] As an option, the second filter page 512 forms a raw water flow channel with the first filter page 511 in the adjacent filter page unit 51, and the first filter page 511 and the second filter page 512 in the same filter page unit 51 form a purified water flow channel. The filter page unit 51 is formed by stacking the first filter page 511 and the second filter page 512. The upper side 513 of the first filter page 511 and the upper side 513 of the second filter page 512 in the same filter page unit 51 are sealed together by glue or welding. The lower side 514 of the second filter page 512 and the lower side 514 of the first filter page 511 in the adjacent filter page unit 51 are sealed together by glue or welding. The filter page unit 51 is wound along the direction of the upper side 513 or the lower side 514, with the left side 515 close to the support cylinder 12. During the winding process, the portion of the lower side 514 of the raw water side 517 of the first filter page 511 that is close to the support cylinder 12 is sealed to the support cylinder 12. The filter page unit 51 is wound along the upper side 513 or the lower side 514, with the left side 515 close to the support cylinder 12. During the winding process, the portion of the upper side 513 of the raw water side 517 of the first filter page 511 that is close to the support cylinder 12 is bonded to the support cylinder 12. The left side 515 of the purified water side 518 of the first filter page 511 in the same filter page unit 51 is sealed with the left side 515 of the purified water side 518 of the second filter page 512, and the right side 516 of the raw water side 517 of the second filter page 512 is sealed with the right side 516 of the raw water side 517 of the first filter page 511 in the adjacent filter page unit 51.

[0141] In the above embodiments, the first filter page 511 and the second filter page 512 can be made of PP cotton filter material.

[0142] In order to ensure that the outer wall of the first filter unit 5 is sealed, as a feasible approach, Figure 12 This is a top view schematic diagram of multiple filter page units wound on a support cylinder in an embodiment of the present invention, as shown below. Figure 12 As shown, the first filter unit 5 may include a water-resistant layer 52 wound around the outside of the filter page unit 51. The water-resistant layer 52 can seal the sidewalls of the cylindrical filter page unit 51. The water-resistant layer 52 may be a waterproof membrane, which is wound around the outermost side of the filter page unit 51 to prevent water from flowing out of the clean water side 518 of the first filter page 511 and the second filter page 512 to the sidewalls. The upper side 513 of the water-resistant layer 52 can be sealed with the upper side 513 of the first filter page 511 and the second filter page 512. The lower side 514 of the water-resistant layer 52 can be sealed with the lower side 514 of the first filter page 511 and the second filter page 512. For example, the seal may be achieved by using a sealant.

[0143] This application also proposes a water purification device, which may include: a composite filter element as described above.

[0144] Furthermore, Figure 13 This is a schematic diagram of the water purification device in an embodiment of the present invention, such as... Figure 13 As shown, the water purification device may include: an inlet water path connected to an inlet 1; a first water outlet path 200 connected to a first outlet 2; a fine filter element 300, the inlet of which is connected to a second outlet 3; and a second water outlet path 400 connected to the outlet of the fine filter element 300. The first water outlet path 200 can output filtered water, after passing through the first filter unit 5 in the composite filter element 100, which can be used as domestic water. The second water outlet path 400 can output drinking water for users, which has passed through the first filter unit 5 and the second filter unit 6 in the composite filter element 100, and then through the fine filter element 300. The fine filter element 300 performs fine filtration of the water, thereby forming purified water that can be used as drinking water. For example, the fine filter element 300 may include at least one of the following: reverse osmosis filter element, nanofiltration membrane filter element, fiber membrane filter element, ultrafiltration membrane filter element, microfiltration membrane filter element, etc. In other feasible embodiments, the fine filter element 300 may also adopt other types of filter elements.

[0145] As a feasible option, such as Figure 10 As shown, the composite filter element 100 may include a return water inlet 19. The return water inlet 19 is connected to the water inlet of the second filter unit 6 or the water inlet of the first filter unit 5. Figure 13 As shown, the water purification device may include: a return water path 500, one end of which is connected to the outlet of the fine filter element 300, and the other end of which is connected to the return water port 19 of the composite filter element 100; and a first one-way valve 600 installed on the return water path 500, which connects the outlet of the fine filter element 300 to the return water port 19 of the composite filter element 100.

[0146] like Figure 13As shown, the water purification device may include a booster device 1400, which is located upstream of the inlet of the fine filter element 300 to drive water in the return water path 500 to flow into the inlet of the fine filter element 300. When the fine filter element 300 is a filter element that needs to discharge wastewater during filtration, the water purification device may further include a wastewater path 700 connected to the wastewater outlet of the fine filter element 300. A wastewater ratio unit may be provided on the wastewater path 700. Furthermore, a combination valve 800 with wastewater ratio function and on / off function may be provided on the wastewater path 700. For example, the combination valve 800 may include a wastewater ratio unit and a first on / off valve connected in series. Alternatively, the combination valve 800 may include: a wastewater ratio unit and a first on / off valve connected in series; and a second on / off valve connected in parallel with the wastewater ratio unit and the first on / off valve connected in series.

[0147] To prevent the TDS value of the first cup of water output from a water purifier from being too high after a long period of inactivity, the booster device 1400 can be activated after a period of inactivity. At this time, the combination valve 800 on the wastewater circuit 700 can be switched to the off state. The return water circuit 500, at least some of the filter units in the composite filter element 100, the booster device 1400, and the fine filter element 300 form a circulating water circuit. The water circulates in the circulating water circuit and is filtered by the fine filter element 300. The purified water formed by the fine filter element 300 flows back to the upstream of at least some of the filter units in the composite filter element 100 through the return water circuit 500. After a period of time, the area between at least some of the filter units in the composite filter element 100 and the inlet of the fine filter element 300 is replaced with purified water. Subsequently, the combination valve 800 can be switched to the connected state, allowing raw water from the water inlet to flow in, displacing the purified water in at least a portion of the filter units in the composite filter element 100. This purified water flows into the fine filter element 300, thereby replacing the wastewater on the raw water side 517 of the fine filter element 300. The wastewater is discharged from the wastewater passage 700, leaving the raw water side 517 of the fine filter element 300 as purified water. By reasonably controlling the timing of the combination valve 800 switching to the connected state, the raw water side 517 of the fine filter element 300 can be precisely replaced with purified water, before subsequent raw water flowing in from the water inlet has reached the fine filter element 300. In other feasible embodiments, an inlet valve 1300, which can be in the form of a solenoid valve, can be installed at the inlet of the water inlet passage. By controlling the opening and closing time of the inlet valve 1300, the raw water side 517 of the fine filter element 300 can be replaced with purified water, while the raw water flowing in from the inlet water path has not yet flowed into the fine filter element 300.

[0148] As a feasible option, such as Figure 13As shown, the water purification device may include a post-filtration unit 900, which can be installed on the second water output channel 400. The post-filtration unit 900 is used to further treat the purified water flowing out of the fine filter cartridge 300, for example, it may include activated carbon, which can filter odors and adjust the taste of the purified water. The activated carbon can be in the form of a carbon rod or other structures. Alternatively, the post-filtration unit 900 can be integrated into the fine filter cartridge 300, thereby reducing the number of filter cartridges in the water purification device, reducing the frequency of filter replacement, and improving the user experience.

[0149] As a feasible option, such as Figure 13 As shown, the first water output channel 200 may be equipped with components such as a pressure switch 1000, a flow sensor 1100, and a second check valve 1200. The second check valve 1200 is located upstream of the pressure switch 1000, and can conduct water from upstream to downstream of the first water output channel 200. When the water output mechanism connected to the first water output channel 200 is not open, the second check valve 1200 can ensure that there is a pressure higher than that of the pressure switch 1000 in the pipeline downstream of the second check valve 1200. When the water output mechanism connected to the first water output channel 200 is open, the pressure in the pipeline downstream of the second check valve 1200 drops, triggering the pressure switch 1000. In this way, the water purification device can determine that the first water output channel 200 needs to output the first filtered water, and the water purification device can open the inlet valve 1300 to allow the first water output channel 200 to output the first filtered water.

[0150] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0151] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A composite filter element, characterized in that, The composite filter element includes: Outer casing; water inlet, first water outlet, second water outlet; The first and second filter units are disposed within the housing. A first end cap is disposed at the upper end of the first filter unit; a first flow channel is formed between the first filter unit and the outer shell; a water inlet channel is formed between the first end cap and the inner wall of the outer shell; the first filter unit is connected to the water inlet through the first flow channel and the water inlet channel; the water outlet and water inlet of the first filter unit are respectively located at two end faces of the first filter unit; the first end cap includes a first cover body and a first tube body, and the outer edge of the first cover body is sealed to the end of the outer wall of the first filter unit near the outlet of the first filter unit; A second flow channel is provided between the first filter unit and the first outlet, the second flow channel is used to supply water passing through the first filter unit to the first outlet; at least a portion of the second flow channel is formed between the first cover and the first filter unit, and the first filter unit is connected to the first tube and the second filter unit respectively through the second flow channel. A third flow channel is provided between the second filter unit and the second outlet, the third flow channel being used to supply water that has passed through the first filter unit and the second filter unit in sequence to the second outlet; The second end cap is disposed at one end of the inlet of the first filter unit. The second end cap has an opening corresponding to the water inlet of the first filter unit. The first flow channel communicates with the water inlet of the first filter unit through the opening. The second end cap includes a second cover body, and the outer edge of the second cover body seals the end of the outer wall of the first filter unit near the water inlet of the first filter unit.

2. The composite filter element according to claim 1, characterized in that, The first filter unit is fitted over the second filter unit.

3. The composite filter element according to claim 2, characterized in that, The composite filter element also includes: The support cylinder contains the second filter unit, which is disposed inside the support cylinder, and the first filter unit is sleeved outside the support cylinder; water passing through the first filter unit can flow into the interior of the support cylinder.

4. The composite filter element according to claim 3, characterized in that, A fourth flow channel is formed between the support cylinder and the outer wall of the second filter unit, so that water flowing through the first filter unit flows into the second filter unit through the fourth flow channel.

5. The composite filter element according to claim 3, characterized in that, The end of the support cylinder furthest from the first end cap is sealed, while the end of the support cylinder closest to the first end cap is open.

6. The composite filter element according to claim 1, characterized in that, The first end cap includes a first tube body portion; The composite filter element also includes: The third end cap includes a third cap body and a second tube body. The third cap body is disposed at the upper end of the second filter unit, and the second tube body passes through the first tube body. At least a portion of the third flow channel is formed inside the second tube body.

7. The composite filter element according to claim 6, characterized in that, The composite filter element also includes: A central tube is inserted into the second filter unit, the central tube is connected to the second tube body, and at least part of the third flow channel is formed in the central tube and the second tube body. A through hole is provided on the side wall of part of the central tube so that the interior of the central tube is connected to the inner side wall of the second filter unit.

8. The composite filter element according to claim 7, characterized in that, Water flows into the second filter unit from the outer wall of the second filter unit for filtration and then flows out from the inner wall of the second filter unit.

9. The composite filter element according to claim 6, characterized in that, The housing has ports; The composite filter element further includes: a connector disposed at the port; the connector has the inlet, the first outlet and the second outlet, and the first tube body and the second tube body are connected to the connector.

10. A composite filter element, characterized in that, The composite filter element includes: Outer casing; water inlet, first water outlet, second water outlet; The first and second filter units are disposed within the housing. A first end cap is disposed at the upper end of the first filter unit; a first flow channel is formed between the first filter unit and the first end cap; a water inlet channel is formed inside the first end cap; the first filter unit is connected to the water inlet through the first flow channel and the water inlet channel; the water outlet and water inlet of the first filter unit are respectively located at two end faces of the first filter unit; the first end cap includes a first cover part and a first tube part, at least a portion of the first flow channel is formed between the first cover part and the first filter unit, and at least a portion of the water inlet channel is formed inside the first tube part; A second flow channel is provided between the first filter unit and the first outlet, the second flow channel being used to supply water passing through the first filter unit to the first outlet; A third flow channel is provided between the second filter unit and the second outlet, the third flow channel being used to supply water that has passed through the first filter unit and the second filter unit in sequence to the second outlet; A support cylinder, wherein the first filter unit is sleeved outside the support cylinder, at least a portion of the support cylinder passes through the first tube body portion, and at least a portion of the second flow channel is formed inside the support cylinder; at least a portion of the second flow channel is formed between the end of the first filter unit and the end of the second filter unit. The second end cap is disposed at one end of the water outlet of the first filter unit. The second end cap has an opening corresponding to the water outlet of the first filter unit, and the water outlet of the first filter unit is connected to the second flow channel through the opening.

11. The composite filter element according to claim 10, characterized in that, The outer casing has an axis, and the first filter element and the second filter element are arranged along the axis.

12. The composite filter element according to claim 10, characterized in that, The composite filter element further includes: a central tube that passes through the support cylinder and the second filter unit, at least a portion of the third flow channel is formed inside the central tube, and at least a portion of the second flow channel is formed between the outer side wall of the central tube and the inner side wall of the support cylinder; a portion of the side wall of the central tube has a through hole to connect the interior of the central tube with the inner side wall of the second filter unit.

13. The composite filter element according to claim 10, characterized in that, A fourth flow channel is formed between the outer wall of the second filter unit and the outer shell; water flowing out of the first filter unit flows into the outer wall of the second filter unit through the fourth flow channel.

14. The composite filter element according to claim 12, characterized in that, The housing includes ports; The composite filter element further includes: a connector disposed at the port; the connector has the inlet, the first outlet and the second outlet, and the first tube body, the support cylinder and the central tube are connected to the connector.

15. The composite filter element according to claim 1 or 10, characterized in that, The outer wall of the first filter unit is sealed.

16. The composite filter element according to claim 1 or 10, characterized in that, The outer casing has two opposite ends, and the water inlet, the first water outlet, and the second water outlet are located at the same end of the outer casing.

17. The composite filter element according to claim 1 or 10, characterized in that, The first filter unit is made of PP cotton filter material.

18. The composite filter element according to claim 1 or 10, characterized in that, The second filter unit is made of activated carbon material.

19. The composite filter element according to claim 18, characterized in that, The second filter unit includes at least one of the following: carbon particles, carbon fibers, and carbon rods.

20. The composite filter element according to claim 3 or 10, characterized in that, The first filtering unit includes: At least one filter leaf unit is wound on the support cylinder. The filter leaf unit has a raw water side and a clean water side. Raw water can only pass through the filter leaf unit from the raw water side to the clean water side of the filter leaf unit to form clean water. In the unfolded state of the filter page unit, the filter page unit includes a first filter page and a second filter page stacked together. The first filter page and the second filter page have opposite upper and lower sides, and opposite left and right sides, respectively. When the first filter unit is filtering, raw water flows into the raw water side from the upper side of the first filter page and the second filter page, passes through the filter page unit, enters the purified water side, and flows out through the lower side of the first filter page and the second filter page.

21. The composite filter element according to claim 20, characterized in that, The first filter unit further includes a water-resistant layer wound around the outside of the filter page unit.

22. A water purification device, characterized in that, The water purification device includes: a composite filter element as described in any one of claims 1 to 21.

23. The water purification device according to claim 22, characterized in that, The water purification device further includes: a water inlet path, which is connected to the water inlet; The first water output channel is connected to the first water outlet. A fine filter element, wherein the inlet of the fine filter element is connected to the second water outlet; The second water output channel is connected to the outlet of the fine filter element.

24. The water purification device according to claim 23, characterized in that, The composite filter element further includes a return water inlet, which is connected to the water inlet of the second filter unit or the water inlet of the first filter unit. The water purification device further includes: a return water path, one end of which is connected to the outlet of the fine filter element, and the other end of which is connected to the return water inlet of the composite filter element; A first check valve is installed on the return water line, which connects the outlet of the fine filter element to the return water port of the composite filter element.

25. The water purification device according to claim 23, characterized in that, A pressure switch and a second check valve located upstream of the pressure switch are provided on the first water output line. The second check valve can be opened from upstream to downstream of the first water output line.

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