Composite filter element and water purification system

Abstract

The invention discloses a composite filter element and a water purification system, and relates to the technical field of water treatment.The composite filter element comprises a shell with a first inlet, a first outlet and a second outlet; the functional assembly and the first filtering assembly are arranged in the shell, and the functional assembly can release functional components into flowing water; the first inlet is communicated with the water inlet side of the first filtering assembly, the first outlet is communicated with the water outlet side of the first filtering assembly, the second outlet is communicated with the outlet of the functional assembly, and the inlet of the functional assembly is communicated with the first inlet and / or the water outlet side of the first filtering assembly. According to the water purification system, the consumption of the functional assembly can be effectively reduced, and the purified water outlet flow of the water purification system can be ensured.

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 system. Background Technology

[0002] As people's demands for drinking water quality continue to rise, existing water purification systems are constantly innovating in design. In current systems, a functional component is typically placed upstream of the fine filtration unit. This design ensures that the raw water entering the fine filtration unit must first pass through the functional component. This component releases functional components into the flowing water, thus imparting these functional components to the raw water entering the fine filtration unit. This raw water with functional components then contributes to the corresponding functional effects of the fine filtration unit during its filtration process.

[0003] However, this design also has some drawbacks. On the one hand, since the functional component is located upstream of the fine filtration component, all raw water input to the fine filtration component needs to pass through the functional component, which will affect the water flow rate of the water purifier and fail to meet the user's demand for quick access to purified water. On the other hand, all raw water needs to pass through the functional component, which will exacerbate the consumption of the functional component and increase the cost of use and maintenance frequency. 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 water purification system, which can not only effectively reduce the consumption of functional components, but also ensure the purified water output flow rate of the water purification system.

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

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

[0007] A housing having a first inlet, a first outlet, and a second outlet; a functional component and a first filter assembly disposed within the housing, the functional component being capable of releasing functional ingredients into flowing water; the first inlet being connected to the water inlet side of the first filter assembly, the first outlet being connected to the water outlet side of the first filter assembly, the second outlet being connected to the outlet of the functional component, and the inlet of the functional component being connected to the first inlet and / or the water outlet side of the first filter assembly.

[0008] Preferably, the composite filter element further includes: a first unidirectional flow component disposed within the housing, the first unidirectional flow component causing the first inlet and / or the outlet side of the first filter assembly to flow toward the inlet direction of the functional component.

[0009] Preferably, the functional components and the first filter component are arranged along the axial direction of the composite filter element.

[0010] Preferably, the composite filter element further includes: a flow guide tube disposed inside the housing, the first filter component being sleeved outside the flow guide tube, one end of the flow guide tube being connected to the outlet of the functional component, and the other end of the flow guide tube being connected to the second outlet.

[0011] Preferably, a first flow channel is formed between the outer sidewall of the first filter assembly and the outer shell, and a second flow channel is formed between the inner sidewall of the first filter assembly and the outer sidewall of the guide tube.

[0012] The functional component includes a housing and a functional material disposed in the housing; a third flow channel is formed between the outer side wall of the housing and the inner side wall of the outer shell; one end of the guide pipe is connected to the outlet of the housing; one end of the third flow channel is connected to the inlet of the housing; and the other end of the third flow channel is connected to the second flow channel or the first flow channel.

[0013] Preferably, the interior of the housing, at the end furthest from the functional component, has a first protruding ring and a second protruding ring extending axially along the housing. The second protruding ring is located inside the first protruding ring, and a first annular space is formed between the first protruding ring and the inner sidewall of the housing. The flow guide tube is inserted into and sealed with the second protruding ring, and the interior of the second protruding ring communicates with the second outlet. The end of the first filter assembly furthest from the functional component has an upper end cap for sealing the end of the first filter assembly. The upper end cap includes an upper end cap body extending radially along the first filter assembly and an insertion portion extending axially along the first filter assembly. The flow guide tube passes through the upper end cap body and the insertion portion. A gap exists between the insertion portion and the outer sidewall of the flow guide tube. The insertion portion is inserted into and sealed with the first protruding ring, and a second annular space is formed between the first protruding ring and the second protruding ring. The second flow channel communicates with the second annular space through the gap between the insertion portion and the outer sidewall of the flow guide tube. The first annular space, the second annular space, and the first inlet and the first outlet are connected one-to-one.

[0014] Preferably, the outer wall of the first filter component is the water inlet side of the first filter component, and the first flow channel is connected to the first inlet; the inner wall of the first filter component is the water outlet side of the first filter component, and the second flow channel is connected to the first outlet.

[0015] Preferably, the inner wall of the first filter component is the water inlet side of the first filter component, and the first flow channel is connected to the first outlet; the outer wall of the first filter component is the water outlet side of the first filter component, and the second flow channel is connected to the first inlet.

[0016] Preferably, when the other end of the third flow channel is connected to the second flow channel, the first filter component has a lower end cover at the end near the functional component, and a sealing element is provided between the lower end cover and the housing; a connecting flow channel is provided between the lower end cover and the housing, and the connecting flow channel connects the third flow channel and the second flow channel.

[0017] Preferably, the lower end cap is used to seal the lower end face of the first filter assembly. The lower end cap includes a lower end cap body extending radially along the first filter assembly, a lower end cap outer extension extending axially along the first filter assembly, and a lower end cap inner extension extending axially along the first filter assembly. The first filter assembly is located between the lower end cap outer extension and the lower end cap inner extension. The sealing element is provided between the lower end cap outer extension and the outer shell. A gap exists between the lower end cap inner extension and the outer wall of the guide tube. A protrusion exists between the lower end cap body and the receiving shell to create a gap between the lower end cap body and the receiving shell, thereby forming the communicating flow channel. The second flow channel communicates with the third flow channel through the gap between the lower end cap inner extension and the outer wall of the guide tube.

[0018] Preferably, when the other end of the third flow channel is connected to the first flow channel, the end of the first filter assembly near the functional component has a lower end cover, and the lower end cover is in a sealed state with the flow guide tube and / or the receiving housing.

[0019] Preferably, the composite filter element further includes: a first unidirectional flow component disposed within the housing, a recessed installation space being formed on the housing, the first unidirectional flow component being installed in the installation space, an inlet being formed on the housing corresponding to the installation space, and an outlet of the first unidirectional flow component communicating with the inlet of the housing.

[0020] Preferably, the composite filter element further includes: a first unidirectional flow component disposed within the housing, the first unidirectional flow component causing the first inlet and / or the outlet side of the first filter component to flow toward the inlet direction of the functional component;

[0021] The first unidirectional flow component is located at the end of the functional component opposite to the first filter component. The first unidirectional flow component extends radially along the composite filter element such that the outlet of the first unidirectional flow component and the inlet of the housing are located near the middle of the housing.

[0022] Preferably, the functional components and the first filter component are arranged along the radial direction of the composite filter element.

[0023] Preferably, the first filter assembly is sleeved outside the functional component, a first flow channel is formed between the outer sidewall of the first filter assembly and the outer shell, and a second flow channel is formed between the inner sidewall of the first filter assembly and the outer sidewall of the functional component.

[0024] The outer wall of the first filter component is the water inlet side of the first filter component, and the first flow channel is connected to the first inlet; the inner wall of the first filter component is the water outlet side of the first filter component, and the second flow channel is connected to the first outlet; the second flow channel is connected to the inlet of the functional component.

[0025] Preferably, the first filter assembly has a lower end cover at one end near the functional component, the lower end cover being used to seal the lower end face of the first filter assembly and the lower end of the space inside the first filter assembly; the functional component is disposed in the receiving space formed by the first filter assembly and the lower end cover.

[0026] Preferably, the upper end of the inner surface of the housing is formed with a first protruding ring and a second protruding ring extending along the axial direction of the housing, the second protruding ring being located inside the first protruding ring; the outlet of the functional component is inserted into and sealed with the second protruding ring, the interior of the second protruding ring communicating with the second outlet; the upper end of the first filter assembly has an upper end cap for sealing the end of the first filter assembly; the upper end cap includes an upper end cap body extending along the radial direction of the first filter assembly and an insertion portion extending along the axial direction of the first filter assembly, the functional component passing through the upper end cap body and the insertion portion, a gap between the insertion portion and the outer side wall of the functional component, the insertion portion being inserted into and sealed with the first protruding ring, a second annular space being formed between the first protruding ring and the second protruding ring; the second flow channel communicating with the second annular space through the gap between the insertion portion and the outer side wall of the functional component; a first annular space is formed between the first protruding ring or the insertion portion and the inner side wall of the housing, the first annular space communicating with the first inlet, and the second annular space communicating with the first outlet.

[0027] Preferably, the functional materials in the functional components include at least one of the following: scale inhibitors, bactericides, and antibacterial materials.

[0028] Preferably, the first filtering component includes a post-filtering component.

[0029] A water purification system comprising a composite filter element as described above.

[0030] Preferably, the water purification system further includes:

[0031] Water inlet channel;

[0032] The second filter component has its inlet connected to the outlet of the water inlet channel, and the first inlet of the composite filter element is connected to the purified water outlet of the second filter component.

[0033] A purified water output channel, wherein the inlet of the purified water output channel is connected to the first outlet of the composite filter element;

[0034] The return water path is connected at one end to the second outlet of the composite filter element, and at the other end to the inlet of the second filter assembly or the inlet water path; the return water path, the second filter assembly, and the functional component can form a circulating water path;

[0035] The drive pump is installed in the circulating water line.

[0036] Preferably, the water purification system has a first state in which the drive pump is turned on, so that the purified water output from the purified water outlet of the second filter component flows back to the second filter component after passing through the functional component and the return water path.

[0037] Preferably, the water purification system further includes: a wastewater discharge path, which is connected to the wastewater outlet of the second filter component, and the wastewater discharge path is provided with a control component having on / off function and wastewater ratio function;

[0038] The water inlet path has a water-containing cavity assembly capable of holding water, and the water-containing cavity assembly is located on the circulating water path.

[0039] Preferably, the water purification system has a first state in which the drive pump is turned on, and the purified water output from the purified water outlet of the second filter component flows back to the receiving cavity component after passing through the functional component and the return water path, so that the receiving cavity component stores water with functional components.

[0040] Preferably, in the first state, the control component is in the disconnected state;

[0041] or,

[0042] The water purification system further includes: an inlet valve installed on the inlet water line, and the return water line connected to the inlet water line downstream of the inlet valve. In the first state, the control component is in wastewater ratio function, and the inlet valve is in the open state.

[0043] or,

[0044] The water purification system further includes: a first water path, one end of which is connected to the wastewater outlet of the second filter component, and the other end of which is connected to the inlet of the second filter component or the inlet water path. In the first state, the first water path is in a connected state, and the wastewater output from the wastewater outlet of the second filter component flows back to the inlet of the second filter component through the first water path or flows back to the inlet of the receiving cavity component through the first water path and the inlet water path.

[0045] Preferably, the water purification system further includes: an inlet valve disposed on the inlet water line, and the return water line is connected to the inlet water line downstream of the inlet valve;

[0046] The water purification system has a second state in which the inlet valve is open, the control component is connected, raw water flows into the inlet water path, and water with functional components in the receiving cavity component flows into the second filter component, so that the raw water in the second filter component is replaced with water with functional components. The wastewater generated by the wastewater outlet of the second filter component is discharged through the wastewater discharge path.

[0047] Preferably, the water purification system further includes: a first water path, one end of which is connected to the wastewater outlet of the second filter component, the drive pump is located on the inlet water path, and the other end of the first water path is connected to the inlet of the receiving cavity component and is connected upstream of the drive pump;

[0048] The water purification system has a second state in which the drive pump is in operation, the first water path is in a connected state, and the wastewater discharged from the wastewater outlet of the second filter component enters the inlet of the receiving cavity component through the first water path. Water containing functional components in the receiving cavity component flows into the inlet of the second filter component to replace the original water in the second filter component with water containing functional components.

[0049] Preferably, in the second state, the control component is in wastewater ratio function, and the purified water output from the purified water outlet of the second filter component flows back through the return water path.

[0050] Preferably, in the second state, the control component is in the off state, and the purified water output from the purified water outlet of the second filter component flows back through the return water path.

[0051] Preferably, the second state of the water purification system is executed after the first state.

[0052] Preferably, the receiving cavity assembly and the second filter assembly are formed in the same filter element, and the other end of the first water passage is connected to the inlet water passage upstream of the inlet of the receiving cavity assembly.

[0053] Preferably, when the receiving cavity assembly and the second filter assembly are independent components, the other end of the first water passage is connected between the inlet of the second filter assembly and the outlet of the receiving cavity assembly.

[0054] Preferably, a second unidirectional guiding component is provided in the first water path, which enables the wastewater outlet of the second filter component to be guided towards the inlet of the second filter component or the water inlet path.

[0055] Preferably, a third unidirectional flow component is provided on the return water path, which enables the purified water outlet of the second filter component or the purified water output path to flow towards the inlet of the second filter component or the inlet water path.

[0056] Preferably, the cavity assembly includes at least a pre-filter assembly.

[0057] Preferably, the second filtration assembly includes at least one of the following: a reverse osmosis membrane filtration assembly, a nanofiltration membrane filtration assembly, or an ultrafiltration membrane filtration assembly.

[0058] Preferably, the composite filter element further includes: a first unidirectional flow component disposed within the housing, the first unidirectional flow component causing the first inlet and / or the outlet side of the first filter component to flow toward the inlet direction of the functional component;

[0059] The water purification system has a water production state. In the water production state, raw water input from the inlet water path flows into the second filter component, and purified water is output from the purified water outlet of the second filter component and output from the purified water output water path. The first one-way conduction component is in the off state.

[0060] Preferably, the composite filter element further includes: a first unidirectional flow component disposed within the housing, the first unidirectional flow component causing the first inlet and / or the outlet side of the first filter component to flow toward the inlet direction of the functional component;

[0061] In the first state, the first unidirectional conduction component is in a connected state.

[0062] The technical solution of the present invention has the following significant beneficial effects:

[0063] In this application, water can be input into the composite filter element through a first inlet. Then, depending on specific needs, in one approach, when water needs to be filtered, the water can flow into the inlet side of the first filter element, be filtered by the first filter element, and then be discharged from the first outlet. In another approach, water can flow into the inlet of the functional component and pass through the functional component, causing the functional component to release functional components into the flowing water. The water containing the functional components is then discharged from the second outlet. In this embodiment, water can directly flow into the inlet of the functional component and pass through the functional component, or it can first flow into the inlet side of the first filter element, be filtered by the first filter element, and then flow into the inlet of the functional component and pass through the functional component. Afterward, the water containing the functional components is discharged from the second outlet. When water only needs to be filtered, the water can flow into the inlet side of the first filter element, be filtered by the first filter element, and then be discharged from the first outlet. In this case, the water does not need to pass through the functional component, and the water flow rate will not decrease due to the necessity of passing through the functional component, thus ensuring the water flow rate of the composite filter element. Simultaneously, it can effectively reduce the consumption of the functional component. When it is necessary to release functional ingredients into water, water can be allowed to flow into the inlet of the functional component and pass through the functional component, thereby causing the functional component to release functional ingredients into the water flowing through it.

[0064] 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

[0065] 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.

[0066] Figure 1 This is a schematic diagram of the composite filter element in the first embodiment of the present invention;

[0067] Figure 2 This is a schematic diagram of the composite filter element in the second embodiment of the present invention;

[0068] Figure 3 This is a schematic diagram of the water purification system in the first embodiment of the present invention;

[0069] Figure 4 This is a schematic diagram of the water purification system in the second embodiment of the present invention;

[0070] Figure 5 This is a schematic diagram of the water purification system in the third embodiment of the present invention.

[0071] The reference numerals in the above figures are as follows:

[0072] 1. Water inlet path; 2. Second filter assembly; 3. Clean water output path; 4. Return water path; 5. Drive pump; 6. Wastewater discharge path; 7. Control assembly; 8. Inlet valve; 9. Composite filter element; 91. Housing; 9101. First raised ring; 9102. Second raised ring; 9103. First annular cavity; 9104. Second annular cavity; 92. First unidirectional conduction component; 93. Functional component; 931. Housing housing; 932. Functional material; 94. First filter assembly; 941. Top cover; 9411. Top cover body; 9412, Insertion part; 942, Lower end cap; 9421, Lower end cap body; 9422, Lower end cap outer extension; 9423, Lower end cap inner extension; 95, Guide tube; 96, First flow channel; 97, Second flow channel; 98, Seal; 99, Third flow channel; 910, Connecting flow channel; 911, First inlet; 912, First outlet; 913, Second outlet; 10, First water passage; 11, Second unidirectional guiding component; 12, Third unidirectional guiding component; 13, Receiving cavity assembly; 14, Opening and closing valve; 15, Small hole structure. Detailed Implementation

[0073] 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.

[0074] 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.

[0075] In order to effectively reduce the consumption of functional components and ensure the purified water output flow rate of the water purification system, a composite filter element is proposed in this application. Figure 1 This is a schematic diagram of the composite filter element in the first embodiment of the present invention. Figure 2 This is a schematic diagram of the composite filter element in the second embodiment of the present invention, as shown below. Figure 1 and Figure 2 As shown, the composite filter element 9 may include: a housing 91 having a first inlet 911, a first outlet 912, and a second outlet 913; a functional component 93 and a first filter component 94 disposed within the housing 91, wherein the functional component 93 is capable of releasing functional components into the flowing water; the first inlet 911 is connected to the water inlet side of the first filter component 94, the first outlet 912 is connected to the outlet of the first filter component 94, the second outlet 913 is connected to the outlet of the functional component 93, and the inlet of the functional component 93 is connected to the first inlet 911 and / or the outlet of the first filter component 94.

[0076] Water can be input into the composite filter element 9 through the first inlet 911. Then, depending on specific needs, in one approach, when water needs to be filtered, the water can flow into the inlet side of the first filter assembly 94, be filtered by the first filter assembly 94, and then be discharged from the first outlet 912. In another approach, water can flow into the inlet of the functional component 93, pass through the functional component 93, thereby causing the functional component 93 to release functional components into the flowing water, and the water containing the functional components is discharged from the second outlet 913. In this embodiment, water can directly flow into the inlet of the functional component 93, pass through the functional component 93, or it can first flow into the inlet side of the first filter assembly 94, be filtered by the first filter assembly 94, and then flow into the inlet of the functional component 93, pass through the functional component 93, and then the water containing the functional components is discharged from the second outlet 913. When water only needs to be filtered, the water can flow into the inlet side of the first filter element 94, be filtered by the first filter element 94, and then be discharged from the first outlet 912. At this time, the water does not need to pass through the functional element 93, and the water flow rate will not decrease due to the need to pass through the functional element 93, thus ensuring the water flow rate of the composite filter element 9 and effectively reducing the consumption of the functional element 93. When it is necessary to release functional components into the water, water can flow into the inlet of the functional element 93 and pass through the functional element 93, thereby allowing the functional element 93 to release functional components into the flowing water.

[0077] In one feasible implementation, the first filter assembly 94 may include a post-filter assembly. The aforementioned composite filter element 9 can be used downstream of the filter assembly that plays the main filtration role in the water purification system. The post-filter assembly can be any filter assembly that plays a post-filtration role in existing water purification systems, such as activated carbon filter elements, mineralization filter elements, ultrafiltration membrane filter elements, etc., and no limitation is made to it in this application.

[0078] When water flows through the functional component 93, the component can release functional components with specific functions into the water. These components may have scale-inhibiting, bactericidal, or bacteriostatic functions. In one feasible embodiment, the functional material 932 in the functional component 93 may include at least one of the following: scale-inhibiting material, bactericidal material, or bacteriostatic material. For example, scale-inhibiting materials may be phosphates, organophosphonic acids, polymer materials, etc.; bactericidal materials may be chlorine-containing bactericides, materials containing silver ions, etc.; and bacteriostatic materials may be nano-silver materials, silver-impregnated glass, etc. To enable the functional component 93 to have both scale-inhibiting and bacteriostatic functions, the functional material 932 may be silver-impregnated phosphate glass.

[0079] In one feasible embodiment, the composite filter element 9 may include a first unidirectional flow member 92 disposed within the housing 91, which directs the first inlet 911 and / or the outlet of the first filter assembly 94 toward the inlet of the functional component 93. The first unidirectional flow member 92 effectively prevents water containing functional components in the functional component 93 from diffusing into the first filter assembly 94, ensuring that only the water flowing into the inlet side of the first filter assembly 94, after being filtered by the first filter assembly 94, discharges from the first outlet 912 containing functional components.

[0080] The functional components 93 and the first filter assembly 94 in the composite filter element 9 can be arranged in various ways. The functional components 93 and the first filter assembly 94 can be arranged along the axial direction of the composite filter element 9, which can effectively reduce the radial dimension of the composite filter element 9, or they can be arranged along the radial direction of the composite filter element 9, which can effectively reduce the axial dimension of the composite filter element 9.

[0081] When the functional component 93 and the first filter component 94 are arranged along the axial direction of the composite filter element 9, as is feasible, such as Figure 1 As shown, the composite filter element 9 may include a guide tube 95 disposed within the housing 91. A first filter assembly 94 is sleeved outside the guide tube 95, one end of the guide tube 95 is connected to the outlet of the functional assembly 93, and the other end of the guide tube 95 is connected to the second outlet 913. This arrangement ensures that the first inlet 911, the first outlet 912, and the second outlet 913 of the composite filter element 9 are all located at the same end of the housing 91.

[0082] Alternatively, a first flow channel 96 is formed between the outer wall of the first filter assembly 94 and the outer casing 91, and a second flow channel 97 is formed between the inner wall of the first filter assembly 94 and the outer wall of the guide pipe 95. The functional component 93 may include a housing 931 and functional material 932 disposed within the housing 931. A third flow channel 99 is formed between the outer wall of the housing 931 and the inner wall of the outer casing 91. One end of the guide pipe 95 communicates with the outlet of the housing 931. One end of the third flow channel 99 communicates with the inlet of the housing 931. The other end of the third flow channel 99 communicates with either the second flow channel 97 or the first flow channel 96.

[0083] The end of the first filter assembly 94 furthest from the functional component 93 has an upper end cap 941 for sealing the end of the first filter assembly 94. The upper end cap 941 includes an upper end cap body 9411 extending radially along the first filter assembly 94 and an insertion portion 9412 extending axially along the first filter assembly 94. The insertion portion 9412 extends upward. The upper end cap 941 may further include an upper end cap outer extension extending axially along the first filter assembly 94 and an upper end cap inner extension extending axially along the first filter assembly 94. The first filter assembly 94 is located between the upper end cap outer extension and the upper end cap inner extension.

[0084] The guide tube 95 passes through the upper end cap body 9411, the insertion part 9412 and the inner extension of the upper end cap. There is a gap between the insertion part 9412 and the outer wall of the guide tube 95, so that the water in the second flow channel 97 can flow upward.

[0085] A first protruding ring 9101 and a second protruding ring 9102 extending axially along the outer casing 91 are formed at the end of the housing 91 furthest from the functional component 93. The second protruding ring 9102 is located inside the first protruding ring 9101. A first annular cavity 9103 is formed between the first protruding ring 9101 and the inner wall of the housing 91. An insertion portion 9412 is inserted into and sealed to the first protruding ring 9101, thereby allowing the first flow channel 96 to communicate with the first annular cavity 9103. For example, the insertion portion 9412 can be inserted into the first protruding ring 9101, and the outer wall of the insertion portion 9412 is sealed to the inner wall of the first protruding ring 9101 by a sealing ring.

[0086] A second annular cavity 9104 is formed between the first protruding ring 9101 and the second protruding ring 9102. The second flow channel 97 communicates with the second annular cavity 9104 through the gap between the insertion part 9412 and the outer wall of the guide tube 95. The guide tube 95 is inserted into and sealed with the second protruding ring 9102, and the interior of the second protruding ring 9102 communicates with the second outlet 913, thus allowing the interior of the guide tube 95 to communicate with the second outlet 913 through the interior of the second protruding ring 9102. For example, the guide tube 95 can be inserted into the second protruding ring 9102, and the outer wall of the guide tube 95 is sealed with the inner wall of the second protruding ring 9102. In this way, the first annular cavity 9103, the second annular cavity 9104, and the interior of the second protruding ring 9102 can be isolated and independent from each other, ensuring that cross-contamination does not occur.

[0087] The first annular space 9103, the second annular space 9104, the first inlet 911, and the first outlet 912 can be connected one-to-one. The first annular space 9103 is connected to the first inlet 911, and the second annular space 9104 is connected to the first outlet 912. Alternatively, the first annular space 9103 is connected to the first outlet 912, and the second annular space 9104 is connected to the first inlet 911.

[0088] In one specific embodiment described above, the outer wall of the first filter assembly 94 is the water inlet side of the first filter assembly 94, and the first flow channel 96 is connected to the first inlet 911. The inner wall of the first filter assembly 94 is the outlet portion of the first filter assembly 94, and the second flow channel 97 is connected to the first outlet 912. In this embodiment, water flows into the housing 91 from the first inlet 911 and then into the first flow channel 96. If only the first filter assembly 94 is needed, the water in the first flow channel 96 flows into the outer wall of the first filter assembly 94, passes through the first filter assembly 94, flows out from the inner wall of the first filter assembly 94, then enters the second flow channel 97 and flows out from the first outlet 912. If water needs to flow through functional component 93, the water in the first flow channel 96 or the water in the second flow channel 97 after flowing through the first filter component 94 flows into the third flow channel 99, and then enters the housing 931 through the inlet of the housing 931. After flowing through the functional material 932 in the housing 931, it is discharged from the second outlet 913 of the composite filter element 9 through the outlet of the housing 931 and the guide pipe 95.

[0089] In another specific embodiment, the inner wall of the first filter assembly 94 is the water inlet side of the first filter assembly 94, and the first flow channel 96 is connected to the first outlet 912. The outer wall of the first filter assembly 94 is the outlet part of the first filter assembly 94, and the second flow channel 97 is connected to the first inlet 911. In this embodiment, water flows into the housing 91 from the first inlet 911 and then into the second flow channel 97. If only the first filter assembly 94 is needed, the water in the second flow channel 97 flows into the inner wall of the first filter assembly 94, passes through the first filter assembly 94, flows out from the outer wall of the first filter assembly 94, then enters the first flow channel 96 and flows out from the first outlet 912. If water needs to flow through functional component 93, the water in the second flow channel 97 or the water in the first flow channel 96 after flowing through the first filter component 94 flows into the third flow channel 99, and then enters the housing 931 through the inlet of the housing 931. After flowing through the functional material 932 in the housing 931, it is discharged from the second outlet 913 of the composite filter element 9 through the outlet of the housing 931 and the guide pipe 95.

[0090] When the other end of the third flow channel 99 is connected to the second flow channel 97, that is, when the other end of the third flow channel 99 is not directly connected to the first flow channel 96, the end of the first filter assembly 94 near the functional assembly 93 may have a lower end cover. A sealing element 98 is provided between the lower end cover and the housing 91, and the sealing element 98 separates the third flow channel 99 from the first flow channel 96. A connecting flow channel 910 is provided between the lower end cover and the housing 931, and the connecting flow channel 910 connects the third flow channel 99 and the second flow channel 97.

[0091] Specifically, the lower end cap 942 is used to seal the lower end face of the first filter assembly 94. The lower end cap 942 includes a lower end cap body 9421 extending radially along the first filter assembly 94, a lower end cap outer extension 9422 extending axially along the first filter assembly 94, and a lower end cap inner extension 9423 extending axially along the first filter assembly 94. The first filter assembly 94 is located between the lower end cap outer extension 9422 and the lower end cap inner extension 9423. A sealing element 98 is provided between the lower end cap outer extension 9422 and the outer shell 91, and a gap exists between the lower end cap inner extension 9423 and the outer side wall of the guide tube 95. A protrusion exists between the lower end cap body 9421 and the receiving shell 931 to create a gap between the lower end cap body 9421 and the receiving shell 931, thereby forming a communicating flow channel 910. The second flow channel 97 connects to the third flow channel 99 through the gap between the inner extension 9423 of the lower end cap and the outer wall of the guide tube 95, and the connecting flow channel 910.

[0092] When the other end of the third flow channel 99 is connected to the first flow channel 96, that is, the other end of the third flow channel 99 is not directly connected to the second flow channel 97, the first filter assembly 94 has a lower end cover at the end near the functional assembly 93, and the lower end cover is sealed with the guide tube 95 and / or the housing 931 so that the third flow channel 99 is separated from the second flow channel 97.

[0093] Specifically, the lower end cap inner extension 9423 and the guide tube 95 can be sealed by a seal 98; or, the lower end cap body 9421 and the receiving housing 931 can be sealed by a seal 98. There is a gap between the lower end cap outer extension 9422 and the outer housing 91, so that the other end of the third flow channel 99 communicates with the first flow channel 96.

[0094] As a feasible option, a recessed mounting space can be formed on the housing 931, and the first one-way guiding member 92 can be installed in the mounting space. An inlet is formed on the housing 931 corresponding to the mounting space, and the outlet of the first one-way guiding member 92 communicates with the inlet of the housing 931. Water in the third flow channel 99 needs to pass through the first one-way guiding member 92 first and then enter the functional material 932 in the functional component 93 through the inlet of the housing 931.

[0095] Furthermore, the first unidirectional flow component 92 is located at the end of the functional component 93 opposite to the first filter component 94. The first unidirectional flow component 92 extends radially along the composite filter element 9, such that the outlet of the first unidirectional flow component 92 and the inlet of the housing 931 are located near the middle of the housing 931. This arrangement allows water to flow into the middle of the housing 931 at the end away from the outlet, ensuring sufficient contact between the water flowing into the housing 931 and the functional material 932 within the functional component 93 before flowing out from the outlet of the housing 931.

[0096] When the functional component 93 and the first filter component 94 are arranged along the radial direction of the composite filter element 9, as is feasible, such as Figure 2 As shown, the first filter assembly 94 can be sleeved outside the functional assembly 93. A first flow channel 96 is formed between the outer side wall of the first filter assembly 94 and the outer shell 91, and a second flow channel 97 is formed between the inner side wall of the first filter assembly 94 and the outer side wall of the functional assembly 93. The outer side wall of the first filter assembly 94 is the water inlet side of the first filter assembly 94, and the first flow channel 96 communicates with the first inlet 911. The inner side wall of the first filter assembly 94 is the outlet part of the first filter assembly 94, and the second flow channel 97 communicates with the first outlet 912. The second flow channel 97 communicates with the inlet of the functional assembly 93.

[0097] In this embodiment, water flows into the housing 91 from the first inlet 911 and then into the first flow channel 96. If only the first filter assembly 94 is needed, the water in the first flow channel 96 flows into the outer wall of the first filter assembly 94, passes through the first filter assembly 94, flows out from the inner wall of the first filter assembly 94, then enters the second flow channel 97 and flows out from the first outlet 912. If the water needs to flow through the functional assembly 93, the water in the second flow channel 97 after passing through the first filter assembly 94 enters the housing 931 through the inlet of the housing 931, flows through the functional material 932 in the housing 931, and then flows out from the second outlet 913 through the outlet of the housing 931.

[0098] Specifically, the first filter assembly 94 has a lower end cap 942 at the end near the functional component 93, which seals the lower end face of the first filter assembly 94 and the lower end of the space inside the first filter assembly 94. This prevents water passing through the first filter assembly 94 from flowing out from its lower end, thus preventing cross-contamination. The functional component 93 is disposed within the receiving space formed by the first filter assembly 94 and the lower end cap 942.

[0099] The upper end of the housing 91 has a first protruding ring 9101 and a second protruding ring 9102 extending in the axial direction of the housing 91, with the second protruding ring 9102 located inside the first protruding ring 9101. The outlet of the functional component 93 is inserted into and sealed with the second protruding ring 9102, and the interior of the second protruding ring 9102 communicates with the second outlet 913. The upper end of the first filter assembly 94 has an upper end cap 941 for sealing the end of the first filter assembly 94. The upper end cap 941 includes an upper end cap body 9411 extending in the radial direction of the first filter assembly 94 and an insertion portion 9412 extending in the axial direction of the first filter assembly 94. The upper end cap 941 may further include an upper end cap outer extension extending in the axial direction of the first filter assembly 94 and an upper end cap inner extension extending in the axial direction of the first filter assembly 94. The first filter assembly 94 is located between the upper end cap outer extension and the upper end cap inner extension.

[0100] Functional component 93 passes through the upper end cover body 9411, insertion portion 9412, and inner extension of the upper end cover. A gap exists between the insertion portion 9412 and the outer wall of functional component 93. The insertion portion 9412 is inserted into and sealed with the first protruding ring 9101. A second annular space 9104 is formed between the first protruding ring 9101 and the second protruding ring 9102. Second flow channel 97 communicates with the second annular space 9104 through the gap between the insertion portion 9412 and the outer wall of functional component 93. A first annular space 9103 is formed between the first protruding ring 9101 or the insertion portion 9412 and the inner wall of the outer casing 91. The first annular space 9103 communicates with the first inlet 911, and the second annular space 9104 communicates with the first outlet 912.

[0101] This application also proposes a water purification system, which may include a composite filter element 9 as described above.

[0102] Furthermore, Figure 3 This is a schematic diagram of the water purification system in the first embodiment of the present invention, as shown below. Figure 3 As shown, the water purification system may include: an inlet water path 1; a second filter component 2, the inlet of which is connected to the outlet of the inlet water path 1, and the first inlet 911 of the composite filter element 9 is connected to the purified water outlet of the second filter component 2; a purified water output water path 3, the inlet of which is connected to the first outlet 912 of the composite filter element 9; a return water path 4, one end of which is connected to the second outlet 913 of the composite filter element 9, and the other end of which is connected to the inlet of the second filter component 2 or the inlet water path 1; the return water path 4, the second filter component 2, and the functional component 93 can form a circulating water path; and a drive pump 5 installed on the circulating water path.

[0103] The second filter element 2 can be a filter element that plays a primary role in filtering water. As feasible, the second filter element 2 may include at least one of the following: a reverse osmosis membrane filter element, a nanofiltration membrane filter element, an ultrafiltration membrane filter element, etc. The inlet water path 1 is used to connect to a water source. The purified water output path 3 supplies purified water to the user. The water purification system has a water production state. In the water production state, raw water input from the inlet water path 1 flows into the second filter element 2, and purified water output from the purified water outlet of the second filter element 2 flows into the first inlet 911 of the composite filter element 9. The purified water is filtered by the first filter element 94 in the composite filter element 9, then flows out of the composite filter element 9 from the first outlet 912, and finally exits from the purified water output path 3. In the water production state, since the purified water output path 3 is connected to the outside, the first unidirectional guide component 92 is in the off state.

[0104] Alternatively, the water purification system can have a first state. In the first state, the drive pump 5 is turned on, so that the purified water output from the purified water outlet of the second filter assembly 2 flows back to the second filter assembly 2 after passing through the functional component 93 and the return water path 4. In the first state, the purified water output path 3 in the water purification system is in a non-output state, that is, no purified water is supplied to the user. In the first state, the purified water output from the purified water outlet of the second filter assembly 2 can enter the functional component 93 after passing through the first filter assembly 94, or it can directly enter the functional component 93 without passing through the first filter assembly 94. In the first state, the purified water output from the purified water outlet of the second filter component 2 contains functional components when passing through the functional component 93. The purified water containing functional components flows back into the second filter component 2. For example, when the functional material 932 includes a scale inhibitor, the purified water containing scale inhibitor can remain in the second filter component 2, thereby reducing the possibility of scale formation in the second filter component 2. Or, for example, when the functional material 932 includes an antibacterial material, the purified water containing antibacterial components can remain in the second filter component 2, effectively reducing the degree of bacterial growth in the second filter component 2 when the water purification system is not used for a long time.

[0105] In this embodiment, wastewater can be discharged when water is filtered through the second filter component 2.

[0106] In other feasible embodiments, when wastewater needs to be discharged after water has been filtered through the second filter component 2, the water purification system may include: a wastewater discharge path 6, which is connected to the wastewater outlet of the second filter component 2. A control component 7 with a wastewater ratio function may be installed on the wastewater discharge path 6. Furthermore, the control component 7 may also have an on / off function. When the control component 7 is in the wastewater ratio function state, the control component 7 is also in a connected state.

[0107] As a feasible option, Figure 4This is a schematic diagram of the water purification system in the second embodiment of the present invention, as shown below. Figure 4 As shown, the water inlet channel 1 may have a water-containing chamber assembly 13, which may be located on the circulating water channel. Furthermore, the water inlet channel 1 may be located on the water inlet channel 1. The amount of water contained in the water inlet channel 13 may be greater than or equal to the amount of water contained in the second filter assembly 2, thus ensuring that the water contained in the water inlet channel 13 is sufficient to replace the water contained in the second filter assembly 2.

[0108] In this embodiment, the water purification system can have a first state. In the first state, the drive pump 5 is in the on state, and the purified water output from the purified water outlet of the second filter component 2 flows back to the receiving cavity component 13 after passing through the functional component 93 and the return water path 4, so that the receiving cavity component 13 stores water with functional components. In the first state, in one mode, the control component 7 can be in the off state. In another mode, the water purification system can include: an inlet valve 8 installed on the inlet water path 1, and the return water path 4 connected to the inlet water path 1 downstream of the inlet valve 8. In the first state, the control component 7 is in the wastewater ratio function, and the inlet valve 8 is in the on state. At this time, while water is producing purified water through the second filter component 2, the wastewater formed is discharged through the wastewater discharge path 6. Therefore, the raw water from the water source needs to be replenished into the circulating water path through the inlet valve 8 to ensure that there is enough water in the circulating water path for circulation. In this method, the raw water from the water source is mixed with purified water containing functional components after passing through functional component 93 and return water path 4, and then returned to the receiving cavity component 13 so that the receiving cavity component 13 stores water containing functional components. In another method, Figure 5 This is a schematic diagram of the water purification system in a third embodiment of the present invention, as shown below. Figure 5As shown, the water purification system may include: a first water path 10, one end of which is connected to the wastewater outlet of the second filter assembly 2, and the other end of which is connected to the inlet of the second filter assembly 2 or the inlet water path 1. In the first state, the first water path 10 is in the connected state, and the wastewater output from the wastewater outlet of the second filter assembly 2 flows back to the inlet of the second filter assembly 2 through the first water path 10 or flows back to the inlet of the receiving cavity assembly 13 through the first water path 10 and the inlet water path 1. At this time, the control component 7 can be in the disconnected state. When the wastewater output from the wastewater outlet of the second filter assembly 2 flows back to the inlet of the second filter assembly 2 through the first water path 10, the purified water with functional components after passing through the functional component 93 and the return water path 4 flows back to the receiving cavity assembly 13, so that the receiving cavity assembly 13 stores purified water with functional components, and the wastewater output from the wastewater outlet of the second filter assembly 2 flows back to the second filter assembly 2 through the first water path 10. When the wastewater output from the wastewater outlet of the second filter component 2 flows back to the inlet of the receiving cavity component 13 through the first water passage 10 and the inlet water passage 1, the purified water with functional components after passing through the functional component 93 and the return water passage 4 mixes with the wastewater output from the wastewater outlet of the second filter component 2 and flows back to the receiving cavity component 13, so that the receiving cavity component 13 stores water with functional components.

[0109] Alternatively, the water purification system may include: an inlet valve 8 installed on the inlet water passage 1. The inlet valve 8 is used to control the connection and disconnection between the inlet water passage 1 and the water source. The return water passage 4 may be connected to the inlet water passage 1 downstream of the inlet valve 8.

[0110] When the composite filter element 9 includes a first one-way conduction component 92 disposed within the housing 91, in all of the aforementioned first states, since the drive pump 5 is in the open state, the pressure inside the functional component 93 is lower than the pressure inside the first filter component 94, causing the first one-way conduction component 92 to open, and therefore, the first one-way conduction component 92 is in the connected state.

[0111] Furthermore, the water purification system can have a second state. In one embodiment, in the second state, the inlet valve 8 is open and the control component 7 is connected, allowing the raw water from the water source to flow into the inlet water passage 1, and the water containing functional components in the receiving cavity assembly 13 to flow into the second filter assembly 2, so that the raw water or wastewater in the second filter assembly 2 is replaced with water containing functional components. The wastewater generated at the wastewater outlet of the second filter assembly 2 is discharged through the wastewater discharge water passage 6. To ensure that the raw water or wastewater in the second filter assembly 2 is replaced with water containing functional components, this can be achieved by controlling the opening time of the inlet valve 8. Alternatively, in this embodiment, in the second state, the control component 7 can be in wastewater ratio function, and the purified water output from the purified water outlet of the second filter assembly 2 flows back through the return water passage 4. The raw water from the water source and the purified water flowing back through the return water passage 4 are mixed and then input into the receiving cavity assembly 13, so that the water containing functional components in the receiving cavity assembly 13 is replaced and flows into the second filter assembly 2.

[0112] In another implementation, when one end of the first water path 10 is connected to the wastewater outlet of the second filter assembly 2, the drive pump 5 is located on the inlet water path 1, and the other end of the first water path 10 is connected to the inlet of the receiving cavity assembly 13 and upstream of the drive pump 5, in the second state, the drive pump 5 is in operation, the first water path 10 is in a connected state, and the wastewater discharged from the wastewater outlet of the second filter assembly 2 enters the inlet of the receiving cavity assembly 13 through the first water path 10. Water containing functional components in the receiving cavity assembly 13 flows into the inlet of the second filter assembly 2, so as to replace the raw water in the second filter assembly 2 with water containing functional components. As a feasible implementation, in this embodiment, in the second state, the control component 7 can be in a disconnected state, and the purified water output from the purified water outlet of the second filter assembly 2 flows back through the return water path 4.

[0113] In all the above embodiments, the second state of the water purification system is performed after the first state, such that water with functional components is stored in the receiving cavity assembly 13 after the first state.

[0114] As a feasible option, to control whether the wastewater generated from the wastewater outlet of the second filter assembly 2 flows back through the first water passage 10, or to control the wastewater generated from the wastewater outlet of the second filter assembly 2 to flow back only at a very small flow rate, an on / off valve 14 or a small orifice structure 15 can be provided on the first water passage 10. When the on / off valve 14 is provided on the first water passage 10, in the first state, in order to ensure that the water containing functional components stored in the receiving cavity assembly 13 is not mixed with wastewater, the on / off valve 14 can be in the off state. When the small orifice structure 15 is provided on the first water passage 10, in the first state, since the wastewater generated from the wastewater outlet of the second filter assembly 2 flows back only at a very small flow rate, it will not have a significant impact on the water containing functional components stored in the receiving cavity assembly 13.

[0115] In all the above embodiments, the receiving cavity assembly 13 and the second filter assembly 2 can be formed in the same filter element or can be separate components. When the receiving cavity assembly 13 and the second filter assembly 2 are formed in the same filter element, in order to facilitate the connection of the other end of the first water passage 10 and avoid making the water passage inside the filter element formed by the receiving cavity assembly 13 and the second filter assembly 2 complicated, the other end of the first water passage 10 can be connected to the upstream water inlet passage 1 of the inlet of the receiving cavity assembly 13.

[0116] When the receiving cavity assembly 13 and the second filter assembly 2 are independent components, preferably, the other end of the first water passage 10 is connected between the inlet of the second filter assembly 2 and the outlet of the receiving cavity assembly 13, thereby preventing the wastewater discharged from the wastewater outlet of the second filter assembly 2 from entering the receiving cavity assembly 13 through the first water passage 10 in the first state.

[0117] In order to prevent the raw water flowing into the water inlet channel 1 from being discharged directly through the first water channel 10 and the wastewater discharge channel 6, it is feasible to install a second one-way flow component 11 on the first water channel 10. The second one-way flow component 11 makes the wastewater outlet of the second filter component 2 flow towards the inlet of the second filter component 2 or the water inlet channel 1.

[0118] As a feasible option, a third one-way flow component 12 can be installed on the return water path 4. The third one-way flow component 12 enables the purified water outlet or purified water output path 3 of the second filter component 2 to flow towards the inlet or inlet water path 1 of the second filter component 2, thereby preventing the raw water flowing into the inlet water path 1 from flowing directly into the functional component 93 through the return water path 4.

[0119] In all the above embodiments, as feasible, the receiving cavity assembly 13 may at least include a pre-filter assembly. The filter material of the pre-filter assembly can itself hold a certain amount of water, and the pre-filter assembly can be used as the receiving cavity assembly 13. In this embodiment, the receiving cavity assembly 13 needs to be located upstream of the second filter assembly 2. Of course, in other feasible embodiments, the receiving cavity assembly 13 only needs to have a cavity for holding water. For example, when the receiving cavity assembly 13 and the second filter assembly 2 can be formed in the same filter element, the pre-filter assembly can be sleeved outside the second filter assembly 2.

[0120] In the water purification system of this application, during water production, raw water input from the inlet water passage 1 flows into the second filter component 2. The purified water output from the outlet of the second filter component 2 flows into the first inlet 911 of the composite filter element 9. The purified water is filtered by the first filter component 94 within the composite filter element 9, then flows out of the composite filter element 9 from the first outlet 912, and finally exits from the purified water outlet water passage 3. Therefore, during the entire water production process, the purified water output from the purified water outlet water passage 3 can completely bypass the functional component 93. This not only effectively reduces the consumption of the functional component 93 but also reduces the water resistance of the entire water purification system, thereby ensuring the purified water output flow rate of the water purification system. When it is necessary to release the functional components from functional component 93 into the water, and to allow the water containing the functional components to flow into the second filter component 2 for corresponding treatment using the functional components, the water purification system can execute the first state. In this state, the drive pump 5 is activated to direct purified water from the outlet of the second filter component 2 into the first inlet 911 of the composite filter element 9. The purified water passes through functional component 93 within the composite filter element 9, acquiring the functional components. The purified water then flows out of the composite filter element 9 from the second outlet 913 and returns to the receiving chamber assembly 13 via the return water path 4. Then, by executing the second state, the water containing the functional components stored in the receiving chamber assembly 13 is driven into the second filter component 2, replacing the raw water or wastewater in the second filter component 2 with the water containing the functional components stored in the receiving chamber assembly 13. This allows the second filter component 2 to be treated accordingly using the functional components. When the second filter component 2 does not require corresponding treatment using functional components, the purified water output by the water purification system in the water production state will not pass through the functional component 93 at all, and the functional components released by the functional component 93 will not have any effect on the output purified water. Only when the water purification system needs to use functional components to treat the second filter component 2 accordingly, the water purification system can execute the first state and the second state to return the functional components released by the functional component 93 to the second filter component 2 using purified water.

[0121] In addition, by executing the first and second states of the water purification system, the raw water in the second filter component 2 can be replaced with water that is mostly purified water. The TDS value of this water is low. When the water purification system is not used for a long time, since the second filter component 2 stores mostly purified water, even if this water slowly permeates through the filter membrane in the second filter component 2 to the purified water side of the filter membrane, the TDS of the first cup of water output when the water purification system is used for the first time after being left unused for a long time will not increase significantly. This helps to improve the user experience.

[0122] 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.

[0123] 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 cartridge, characterized by, The composite filter element comprises: an outer shell having a first inlet, a first outlet and a second outlet; a functional assembly and a first filter assembly arranged in the outer shell, the functional assembly being capable of releasing a functional component into water flowing therethrough; the first inlet being in communication with a water inlet side of the first filter assembly, the first outlet being in communication with a water outlet side of the first filter assembly, and the second outlet being in communication with an outlet of the functional assembly, and an inlet of the functional assembly being in communication with the first inlet and / or the water outlet side of the first filter assembly.

2. The composite filter cartridge of claim 1, wherein, The composite filter element further comprises a first one-way conducting component arranged in the outer shell, the first one-way conducting component allowing the first inlet and / or the water outlet side of the first filter assembly to be conducted to the inlet of the functional assembly.

3. The composite filter cartridge of claim 1 wherein, The functional assembly and the first filter assembly are arranged along an axial direction of the composite filter element.

4. The composite filter cartridge of claim 3 wherein, The composite filter element further comprises a flow guide tube arranged in the outer shell, the first filter assembly being sleeved outside the flow guide tube, one end of the flow guide tube being in communication with the outlet of the functional assembly, and the other end of the flow guide tube being in communication with the second outlet.

5. The composite filter cartridge of claim 4 wherein, An outer side wall of the first filter assembly and the outer shell form a first flow channel, and an inner side wall of the first filter assembly and an outer side wall of the flow guide tube form a second flow channel. The functional assembly comprises a containing shell and a functional material arranged in the containing shell, an outer side wall of the containing shell and an inner side wall of the outer shell form a third flow channel, one end of the flow guide tube is in communication with an outlet of the containing shell, one end of the third flow channel is in communication with an inlet of the containing shell, and the other end of the third flow channel is in communication with the second flow channel or the first flow channel.

6. The composite filter cartridge of claim 5 wherein, An inner end of the outer shell away from the functional assembly is formed with a first protruding ring and a second protruding ring extending along an axial direction of the outer shell, the second protruding ring is located inside the first protruding ring, and a first annular space is formed between the first protruding ring and an inner side wall of the outer shell; the flow guide tube is inserted into the second protruding ring and is sealed therewith, and an inner portion of the second protruding ring is in communication with the second outlet; an end of the first filter assembly away from the functional assembly is provided with an upper end cover for sealing the end of the first filter assembly; the upper end cover comprises an upper end cover body extending along a radial direction of the first filter assembly and an insertion portion extending along an axial direction of the first filter assembly, the flow guide tube passes through the upper end cover body and the insertion portion, a gap is formed between the insertion portion and an outer side wall of the flow guide tube, the insertion portion is inserted into the first protruding ring and is sealed therewith, a second annular space is formed between the first protruding ring and the second protruding ring; the second flow channel is in communication with the second annular space through the gap between the insertion portion and the outer side wall of the flow guide tube; and the first annular space, the second annular space and the first inlet and the first outlet are in one-to-one communication.

7. The composite filter cartridge of claim 5 wherein, The outer side wall of the first filter assembly is the water inlet side of the first filter assembly, and the first flow channel is communicated with the first inlet; the inner side wall of the first filter assembly is the water outlet side of the first filter assembly, and the second flow channel is communicated with the first outlet.

8. The composite filter cartridge of claim 5 wherein, The outer side wall of the first filter assembly is the water inlet side of the first filter assembly, and the first flow channel is communicated with the first inlet; the inner side wall of the first filter assembly is the water outlet side of the first filter assembly, and the second flow channel is communicated with the first outlet.

9. The composite filter cartridge of claim 7 wherein, When the other end of the third flow channel is communicated with the second flow channel, the first filter assembly has a lower end cover at one end close to the functional assembly, and a sealing element is arranged between the lower end cover and the shell; the lower end cover and the containing shell have a communication flow channel, and the communication flow channel communicates the third flow channel and the second flow channel.

10. The composite filter cartridge of claim 9, wherein, The lower end cover is used for sealing the lower end surface of the first filter assembly, and the lower end cover comprises a lower end cover body extending in the radial direction of the first filter assembly, a lower end cover outer extension part extending in the axial direction of the first filter assembly, and a lower end cover inner extension part extending in the axial direction of the first filter assembly; the first filter assembly is located between the lower end cover outer extension part and the lower end cover inner extension part; the sealing element is arranged between the lower end cover outer extension part and the shell, there is a gap between the lower end cover inner extension part and the outer side wall of the flow guide pipe, and there is a protrusion between the lower end cover body and the containing shell to form a gap therebetween, thereby forming the communication flow channel; the second flow channel is communicated with the third flow channel through the gap between the lower end cover inner extension part and the outer side wall of the flow guide pipe and the communication flow channel.

11. The composite filter element of claim 7, wherein, When the other end of the third flow channel is communicated with the first flow channel, the first filter assembly has a lower end cover at one end close to the functional assembly, and the lower end cover is in a sealed state between the flow guide pipe and / or the containing shell.

12. The composite filter element of claim 5, wherein, The composite filter core further comprises a first one-way conducting component arranged in the shell, a recessed mounting space is formed on the containing shell, the first one-way conducting component is mounted in the mounting space, an inlet is formed on the containing shell corresponding to the mounting space, and an outlet of the first one-way conducting component is communicated with the inlet of the containing shell.

13. The composite filter element of claim 5, wherein, The composite filter core further comprises a first one-way conducting component arranged in the shell, and the first one-way conducting component allows the first inlet and / or the water outlet side of the first filter assembly to be conducted to the inlet of the functional assembly. The first one-way conducting component is located at one end of the functional assembly away from the first filter assembly, and the first one-way conducting component extends in the radial direction of the composite filter core, so that the outlet of the first one-way conducting component is located near the middle part of the containing shell.

14. The composite filter element of claim 1, wherein, The functional assembly and the first filter assembly are arranged in the radial direction of the composite filter core.

15. The composite filter cartridge of claim 14, wherein, The first filter assembly is sleeved outside the functional assembly, a first flow channel is formed between the outer sidewall of the first filter assembly and the shell, and a second flow channel is formed between the inner sidewall of the first filter assembly and the outer sidewall of the functional assembly. The outer sidewall of the first filter assembly is the water inlet side of the first filter assembly, the first flow channel is communicated with the first inlet, the inner sidewall of the first filter assembly is the water outlet side of the first filter assembly, the second flow channel is communicated with the first outlet, and the second flow channel is communicated with the inlet of the functional assembly.

16. The composite filter cartridge of claim 15, wherein, The first filter assembly is provided with a lower end cover at one end close to the functional assembly, the lower end cover is used for sealing the lower end surface of the first filter assembly and the lower end of the space inside the first filter assembly, and the functional assembly is arranged in the accommodating space formed by the first filter assembly and the lower end cover.

17. The composite filter cartridge of claim 15 wherein, The upper end of the shell is provided with a first protruding ring and a second protruding ring extending in the axial direction of the shell, the second protruding ring is located inside the first protruding ring, the outlet of the functional assembly is inserted into the second protruding ring and is sealed, the inside of the second protruding ring is communicated with the second outlet, the upper end of the first filter assembly is provided with an upper end cover used for sealing the end of the first filter assembly, the upper end cover comprises an upper end cover body extending in the radial direction of the first filter assembly and an insertion part extending in the axial direction of the first filter assembly, the functional assembly passes through the upper end cover body and the insertion part, a gap is formed between the insertion part and the outer sidewall of the functional assembly, the insertion part is inserted into the first protruding ring and is sealed, and a second annular space is formed between the first protruding ring and the second protruding ring; the second flow channel is communicated with the second annular space through the gap between the insertion part and the outer sidewall of the functional assembly; a first annular space is formed between the first protruding ring or the insertion part and the inner sidewall of the shell, the first annular space is communicated with the first inlet, and the second annular space is communicated with the first outlet.

18. The composite filter element of claim 1, wherein, The functional material in the functional assembly at least comprises one of the following: scale inhibition material, bactericidal material and bacteriostatic material.

19. The composite filter element of claim 1, wherein, The first filter assembly comprises a post-filter assembly.

20. A water purification system characterized by, The water purification system comprises the composite filter element.

21. The water purification system of claim 20, wherein, The water purification system further comprises: a water inlet channel; a second filter assembly, an inlet of the second filter assembly is communicated with the outlet of the water inlet channel, and a first inlet of the composite filter element is communicated with a purified water outlet of the second filter assembly; a purified water output channel, an inlet of the purified water output channel is communicated with the first outlet of the composite filter element; a backwater channel, one end of the backwater channel is communicated with the second outlet of the composite filter element, and the other end of the backwater channel is communicated with the inlet of the second filter assembly or the water inlet channel; the backwater channel, the second filter assembly and the functional assembly can form a circulating water channel; a driving pump arranged on the circulating water channel.

22. The water purification system of claim 21, wherein, The water purification system has a first state, in which the driving pump is in an open state, and the purified water output by the purified water outlet of the second filter assembly is returned to the second filter assembly through the function assembly and the backwater waterway.

23. The water purification system of claim 21, wherein, The water purification system further comprises a waste water discharge waterway in communication with the waste water outlet of the second filter assembly, and a control assembly with on-off function and waste water ratio function is arranged on the waste water discharge waterway. The water inlet waterway is provided with a containing cavity assembly capable of containing water, and the containing cavity assembly is located on the circulating waterway.

24. The water purification system of claim 23, wherein, The water purification system has a first state, in which the driving pump is in an open state, and the purified water output by the purified water outlet of the second filter assembly is returned to the second filter assembly through the function assembly and the backwater waterway.

25. The water purification system of claim 24, wherein, In the first state, the control assembly is in an off state. Or, The water purification system further comprises a water inlet valve arranged on the water inlet waterway, and the backwater waterway is connected to the water inlet waterway downstream of the water inlet valve. In the first state, the control assembly is in a waste water ratio function, and the water inlet valve is in an open state. Or, 26. The water purification system of claim 24, wherein The water purification system further comprises a first waterway, one end of which is in communication with the waste water outlet of the second filter assembly, and the other end of which is in communication with the inlet of the second filter assembly or the water inlet waterway. The water purification system further comprises a water inlet valve arranged on the water inlet waterway, and the backwater waterway is connected to the water inlet waterway downstream of the water inlet valve.

27. The water purification system of claim 24, wherein, The water purification system has a second state, in which the water inlet valve is in an open state, the control assembly is in a communication state, raw water flows into the water inlet waterway, and the water with functional components in the containing cavity assembly flows into the second filter assembly, so that the raw water in the second filter assembly is replaced by the water with functional components, and the waste water generated by the waste water outlet of the second filter assembly is discharged through the waste water discharge waterway. The water purification system further comprises a first waterway, one end of which is in communication with the waste water outlet of the second filter assembly, and the other end of which is in communication with the inlet of the containing cavity assembly and connected upstream of the driving pump. The water purification system has a second state, in which the driving pump is in an open state, and the purified water output by the purified water outlet of the second filter assembly is returned to the second filter assembly through the function assembly and the backwater waterway.

28. The water purification system of claim 26, wherein, In the second state, the control assembly is in a wastewater ratio function, and the clean water output by the clean water outlet of the second filter assembly is returned through the return water channel.

29. The water purification system of claim 27, wherein, In the second state, the control assembly is in an off state, and the clean water output by the clean water outlet of the second filter assembly is returned through the return water channel.

30. The water purification system of any one of claims 26 to 28, wherein, The second state of the clean water system is executed after the first state.

31. The water purification system of claim 25 or 27, wherein, The containing cavity assembly and the second filter assembly are formed in the same filter core, and the other end of the first water channel is connected to the upstream of the inlet of the containing cavity assembly.

32. The water purification system of claim 25, wherein, When the containing cavity assembly and the second filter assembly are independent components, the other end of the first water channel is connected between the inlet of the second filter assembly and the outlet of the containing cavity assembly.

33. The water purification system of claim 25 or 27, wherein, A second one-way conducting component is arranged on the first water channel, which allows the wastewater outlet of the second filter assembly to be conducted to the inlet of the second filter assembly or the inlet of the water inlet channel.

34. The water purification system of claim 21, wherein, A third one-way conducting component is arranged on the return water channel, which allows the clean water outlet of the second filter assembly or the clean water output channel to be conducted to the inlet of the second filter assembly or the inlet of the water inlet channel.

35. The water purification system of claim 23, wherein, The containing cavity assembly at least includes a pre-filter assembly.

36. The water purification system of claim 23, wherein, The second filter assembly at least includes one of the following: a reverse osmosis membrane filter assembly, a nanofiltration membrane filter assembly, and an ultrafiltration membrane filter assembly.

37. The water purification system of claim 21, wherein, The composite filter core further comprises a first one-way conducting component arranged in the shell, which allows the first inlet and / or the water outlet side of the first filter assembly to be conducted to the inlet of the functional assembly. The clean water system has a water production state, in which raw water input from the water inlet channel flows into the second filter assembly, the clean water outlet of the second filter assembly outputs clean water and outputs from the clean water output channel, and the first one-way conducting component is in an off state.

38. The water purification system of claim 22 or 24, wherein, The composite filter core further comprises a first one-way conducting component arranged in the shell, which allows the first inlet and / or the water outlet side of the first filter assembly to be conducted to the inlet of the functional assembly. In the first state, the first one-way conducting component is in a connected state. In the second state, the control assembly is in a wastewater ratio function, and the clean water output by the clean water outlet of the second filter assembly is returned through the return water channel. In the second state, the control assembly is in an off state, and the clean water output by the clean water outlet of the second filter assembly is returned through the return water channel. The second state of the clean water system is executed after the first state. The containing cavity assembly and the second filter assembly are formed in the same filter core, and the other end of the first water channel is connected to the upstream of the inlet of the containing cavity assembly. When the containing cavity assembly and the second filter assembly are independent components, the other end of the first water channel is connected between the inlet of the second filter assembly and the outlet of the containing cavity assembly. A second one-way conducting component is arranged on the first water channel, which allows the wastewater outlet of the second filter assembly to be conducted to the inlet of the second filter assembly or the inlet of the water inlet channel. A third one-way conducting component is arranged on the return water channel, which allows the clean water outlet of the second filter assembly or the clean water output channel to be conducted to the inlet of the second filter assembly or the inlet of the water inlet channel. The containing cavity assembly at least includes a pre-filter assembly. The second filter assembly at least includes one of the following: a reverse osmosis membrane filter assembly, a nanofiltration membrane filter assembly, and an ultrafiltration membrane filter assembly. The composite filter core further comprises a first one-way conducting component arranged in the shell, which allows the first inlet and / or the water outlet side of the first filter assembly to be conducted to the inlet of the functional assembly. The clean water system has a water production state, in which raw water input from the water inlet channel flows into the second filter assembly, the clean water outlet of the second filter assembly outputs clean water and outputs from the clean water output channel, and the first one-way conducting component is in an off state. The composite filter core further comprises a first one-way conducting component arranged in the shell, which allows the first inlet and / or the water outlet side of the first filter assembly to be conducted to the inlet of the functional assembly. In the first state, the first one-way conducting component is in a connected state.

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