Filter cartridges and their assembly methods, water purification devices

Abstract

This invention discloses a filter element and its assembly method, as well as a water purification device, relating to the field of water treatment technology. The filter element includes: a filter bottle with an axis; a first isolation mechanism disposed within the filter bottle, the first isolation mechanism dividing the space within the filter bottle into a first receiving space located within the first isolation mechanism and a second receiving space located between the outer wall of the first isolation mechanism and the inner wall of the filter bottle; a first filtration unit disposed in the first receiving space; and a second filtration unit disposed in the second receiving space. This application provides a novel arrangement of the filtration units to improve the filtration effect of the second filtration unit.

Description

Technical Field

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

[0002] Existing water purification devices require multiple steps of water treatment, often involving multiple filter cartridges with different functions. The outlets and inlets of the filter units in different functions of the filter cartridges all require external pipes for connection, making the water purification equipment's piping complex and taking up a lot of space, which is inconvenient for installation and use. Summary of the Invention

[0003] 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 filter element and its assembly method, and a water purification device, which provides a new arrangement of filter units to improve the filtration effect of the second filter unit.

[0004] The specific technical solution of this invention is as follows:

[0005] A filter element, the filter element comprising:

[0006] Filter bottles with an axis;

[0007] A first isolation mechanism is disposed inside the filter bottle, which isolates the space inside the filter bottle into a first accommodating space located within the first isolation mechanism and a second accommodating space located between the outer side wall of the first isolation mechanism and the inner side wall of the filter bottle.

[0008] A first filter unit disposed in the first accommodating space;

[0009] A second filter unit is disposed in the second containment space.

[0010] Preferably, the filter element further includes a third filter unit disposed in the second accommodating space.

[0011] Preferably, the second filter unit and the third filter unit are arranged along the axial direction.

[0012] Preferably, the filter element further includes: a second isolation mechanism sleeved outside the first isolation mechanism, the second isolation mechanism isolating at least a portion of the second accommodating space into a first annulus between the second isolation mechanism and the first isolation mechanism, and a second annulus between the filter bottle and the second isolation mechanism, the first annulus being connected to the second annulus.

[0013] Preferably, the second filter unit is located in the first annular space and / or in the second annular space.

[0014] Preferably, the filter element further includes a third filter unit disposed in the second accommodating space.

[0015] Preferably, the second filter unit and the third filter unit are arranged along the axial direction or along the radial direction of the filter bottle.

[0016] Preferably, the second filter unit is disposed in the second annular space, and the third filter unit is disposed in the second accommodating space between the end of the second isolation mechanism and the bottom of the filter bottle.

[0017] Preferably, the second filter unit is disposed in the first annular space, and the third filter unit is disposed in the second accommodating space between the end of the second isolation mechanism and the bottom end of the filter bottle.

[0018] Preferably, the second filter unit and the third filter unit are disposed together in the first annulus or the second annulus.

[0019] Preferably, the second filter unit is disposed in the first annular space, and the third filter unit is disposed in the second annular space; or the second filter unit is disposed in the second annular space, and the third filter unit is disposed in the first annular space.

[0020] Preferably, the second filtration unit has a second inlet and a second outlet, with the second inlet and the second outlet facing the two ends of the filter bottle, respectively.

[0021] Preferably, the second filter unit has a second water inlet and a second water outlet, and the third filter unit has a third water inlet and a third water outlet, wherein the third water inlet is connected to the second water outlet.

[0022] Preferably, the filter element includes: a filter bottle interface assembly installed at the bottle mouth of the filter bottle, the filter bottle interface assembly having a third port and a fourth port, the fourth port being connected to the first annulus, and the third port being connected to the second annulus.

[0023] Preferably, the filter element further includes: a support frame with a hollowed-out design, the first filter unit being sleeved on the support frame, the first water inlet of the first filter unit being located on the outer side wall of the first filter unit, and the first water outlet of the first filter unit being located on the inner side wall of the first filter unit.

[0024] Preferably, the filter element includes: a filter bottle interface assembly installed at the bottle mouth of the filter bottle, the filter bottle interface assembly having a first port and a second port, the first port and the gap between the first isolation mechanism and the outer wall of the first filter unit being connected, and the second port being connected to the interior of the support frame.

[0025] Preferably, the second filter unit is made of granular activated carbon, which fills the second annulus and / or the first annulus.

[0026] Preferably, the third filtration unit includes a microfiltration membrane, an ultrafiltration membrane, or PP cotton.

[0027] Preferably, the third filtration unit further includes: a receiving member having an annular receiving groove on its outer side wall, wherein the microfiltration membrane, ultrafiltration membrane, or PP cotton is arranged in the receiving groove in a stacked manner, the bottom of the receiving groove is connected to the inner side wall of the receiving member through a water guide hole, and there is at least a partial gap between the receiving member and the inner side wall of the filter bottle so that the third water inlet of the third filtration unit is connected to the second annular space, and the third water inlet of the third filtration unit is located at the outer side wall of the receiving member; there is at least a partial gap between the inner side wall of the receiving member and the first isolation mechanism so that the third water outlet of the third filtration unit is connected to the first annular space.

[0028] Preferably, the filter element further includes: a support frame with a hollowed-out design, the first filter unit being sleeved on the support frame, the middle part of the support frame being hollow; and a lower sealing member for sealing the end of the first filter unit away from the bottle opening, the lower sealing member having a protrusion that extends into the middle part of the support frame.

[0029] Preferably, a channel is formed inside the lower seal, the channel being able to connect the third water outlet of the third filter unit, the gap between the first isolation mechanism and the outer wall of the first filter unit; a one-way valve is provided in the channel to guide the flow from the third water outlet of the third filter unit to the gap between the first isolation mechanism and the outer wall of the first filter unit.

[0030] Preferably, a channel is formed within the first isolation mechanism, the channel being located at one end of the first isolation mechanism near the bottle opening of the filter bottle, the channel connecting the third water outlet of the third filter unit and the gap between the first isolation mechanism and the first filter unit; a one-way valve is provided in the channel to guide the flow from the third water outlet of the third filter unit to the gap between the outer walls of the first isolation mechanism and the first filter unit.

[0031] Preferably, the first filter unit is a pre-filter unit, and the first filter unit is rolled PP cotton or PP cotton and carbon fiber.

[0032] A water purification device, the water purification device comprising a filter element as described in any of the above descriptions.

[0033] Preferably, the water purification device further includes: a water purification filter element, the inlet of which can be connected to the first filtration unit, and the outlet of which can be connected to the second water inlet of the second filtration unit.

[0034] Preferably, the water purification filter element includes an RO membrane filter element or a nanofiltration membrane filter element.

[0035] A method for assembling a filter element, the method comprising:

[0036] The first filter unit with a support frame is installed into the first isolation mechanism;

[0037] The third filter unit and the second isolation mechanism are installed outside the first isolation mechanism, and a first annular space is formed between the second isolation mechanism and the first isolation mechanism. The first annular space is connected to the third filter unit.

[0038] The first filter unit, the first isolation mechanism, the third filter unit, and the second isolation mechanism, which are assembled together, are installed into the lower housing with a bottom of the filter bottle, and a second annular space is formed between the second isolation mechanism and the lower housing;

[0039] The second filter unit is filled into the air of the second ring;

[0040] After the second filter unit is filled, the upper housing of the filter bottle is connected to the lower housing, and the filter bottle interface assembly is installed at the bottle mouth of the filter bottle. The filter bottle interface assembly is connected to the first isolation mechanism and the second isolation mechanism.

[0041] Preferably, the first filter unit, the first isolation mechanism, the third filter unit, and the second isolation mechanism, which are assembled together, are installed into the lower housing of the filter bottle, which has a bottom. The third filter unit is limited between the bottom and the first isolation mechanism, and a second receiving space is formed between the second isolation mechanism and the lower housing.

[0042] A second filter unit is filled into the second accommodating space, and the second filter unit and the third filter unit are arranged along the axial direction.

[0043] Preferably, the assembly method of the filter element further includes:

[0044] The protrusion of the lower seal extends into the middle of the support frame, and the lower seal seals the end of the first filter unit away from the bottle opening.

[0045] Preferably, the second filter unit is granular activated carbon. The technical solution of the present invention has the following significant beneficial effects:

[0046] The filter cartridge in this application combines at least two filter units within a single filter bottle, with no interference between the two units. This effectively simplifies the piping of the water purification device, allowing for smaller installation spaces, such as under a kitchen sink. Secondly, by integrating multiple filter units, the number of filter cartridges required in the water purification device is significantly reduced. When a filter unit reaches the end of its lifespan, replacing just one cartridge achieves the same result as replacing multiple units, greatly reducing the frequency of replacements. Furthermore, the first isolation mechanism divides the space within the filter bottle into a first receiving space within the first isolation mechanism and a second receiving space between the outer wall of the first isolation mechanism and the inner wall of the filter bottle. Since the second receiving space is formed by the outer wall of the first isolation mechanism and the inner wall of the filter bottle, its axial length is longer. This allows the second filter unit within the second receiving space to have a longer axial distance, significantly increasing the length of water passing through the second filter unit during filtration, resulting in a better filtration effect. Finally, by rationally arranging the first and second containment spaces, the volume of the second containment space can be increased while keeping the filter bottles of the same length, thereby accommodating more filter media and achieving a greater flow rate.

[0047] 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

[0048] 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.

[0049] Figure 1 This is a cross-sectional schematic diagram of the filter element in an embodiment of the present invention;

[0050] Figure 2This is a cross-sectional schematic diagram of the filter element channel in another embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of the structure of the first isolation mechanism in an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of the structure of the second isolation mechanism in an embodiment of the present invention;

[0053] Figure 5 for Figure 4 Cross-sectional view of AA in the middle;

[0054] Figure 6 This is a schematic diagram of the structure of the receiving component in an embodiment of the present invention;

[0055] Figure 7 This is a schematic diagram of the structure of the accommodating member in another embodiment of the present invention;

[0056] Figure 8 This is a schematic diagram of the blocking component in an embodiment of the present invention;

[0057] Figure 9 This is a schematic diagram of the lower seal in another embodiment of the present invention;

[0058] Figure 10 This is a top view of the filter bottle interface assembly in an embodiment of the present invention;

[0059] Figure 11 for Figure 10 Cross-sectional view at point AA;

[0060] Figure 12 This is a schematic diagram showing the open state of the interface hole unit of the filter bottle interface assembly in an embodiment of the present invention.

[0061] The reference numerals in the above figures are as follows:

[0062] 1. First isolation mechanism; 11. First support part; 12. Limiting part; 13. Recessed part; 2. Filter bottle; 21. Upper shell; 22. Lower shell; 23. First receiving space; 24. Second receiving space; 241. First annulus; 242. Second annulus; 3. First filtration unit; 4. Second filtration unit; 5. Third filtration unit; 51. Receiving component; 511. Receiving groove; 512. Water guide hole; 513. Upper extension part; 514. Lower extension part; 515. Snap-fit ​​joint Structure; 516, limiting groove; 52, microfiltration membrane; 6, second isolation mechanism; 61, second support part; 62, step part; 63, groove; 7, filter bottle interface assembly; 71, filter bottle interface body; 72, water-stopping mechanism; 73, first annular extension part; 74, second annular extension part; 75, third annular extension part; 76, interface hole unit; 8, support frame; 9, lower seal; 91, protrusion; 10, channel; 11, one-way valve; 12, blocking part; 121, opening. Detailed Implementation

[0063] 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.

[0064] 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.

[0065] To provide a new arrangement of filter units and improve the filtration effect of the second filter unit 4, this application proposes a filter element. Figure 1 This is a cross-sectional schematic diagram of the filter element in an embodiment of the present invention. Figure 2 This is a cross-sectional schematic diagram of the filter element channel in another embodiment of the present invention, as shown below. Figure 1 and Figure 2 As shown, the filter element includes: a filter bottle 2 with an axis; a first isolation mechanism 1 disposed within the filter bottle 2, the first isolation mechanism 1 dividing the space within the filter bottle 2 into a first receiving space 23 located within the first isolation mechanism 1 and a second receiving space 24 located between the outer side wall of the first isolation mechanism 1 and the inner side wall of the filter bottle 2; a first filtration unit 3 disposed in the first receiving space 23; and a second filtration unit 4 disposed in the second receiving space 24.

[0066] The filter cartridge in this application combines at least two filter units within the same filter bottle 2, with no interference between the two filter units. This effectively simplifies the piping of the water purification device, allowing the device to occupy less space and be installed in confined areas, such as under a kitchen sink. Furthermore, by integrating multiple filter units, the number of filter cartridges required in the water purification device is significantly reduced. When the lifespan of a filter unit within the cartridge expires, replacing one cartridge achieves the same result as replacing multiple filter units, thus greatly reducing the frequency of filter replacements.

[0067] Furthermore, the space within the filter bottle 2 is divided into a first receiving space 23 located within the first isolation mechanism 1 and a second receiving space 24 located between the outer wall of the first isolation mechanism 1 and the inner wall of the filter bottle 2. Since the second receiving space 24 is formed by the outer wall of the first isolation mechanism 1 and the inner wall of the filter bottle 2, its axial length is relatively long. This allows the second filtration unit 4, which is located within the second receiving space 24, to have a longer axial length, significantly increasing the length of water passing through the second filtration unit 4 during filtration, thus enabling the second filtration unit 4 to achieve a better filtration effect. Finally, through a reasonable layout of the first and second receiving spaces, the volume of the second receiving space can be larger for the same length of filter bottle, thereby accommodating more filter media and achieving a greater water flow rate.

[0068] To better understand the filter element in this application, further explanation and elaboration will be provided below. For example... Figure 1 and Figure 2As shown, the filter element may include: a filter bottle 2, a first isolation mechanism 1, a first filtration unit 3, and a second filtration unit 4. The filter bottle 2 has a first receiving space 23 and a second receiving space 24 that are isolated from each other, formed inside by the first isolation mechanism 1. The filter bottle 2 has a bottle mouth for allowing water to flow into and out of the filter bottle 2. The filter bottle 2 has an axis and may have two opposing ends, one at the bottle mouth and the other at the bottom, distributed along the axis. The first filtration unit 3 and the second filtration unit 4 are disposed inside the filter bottle 2. To facilitate the installation of components such as the first isolation mechanism 1, the first filtration unit 3, and the second filtration unit 4 into the filter bottle 2, the filter bottle 2 may include an upper housing 21 and a lower housing 22, which are detachably connected. However, after the first filtration unit 3 and the second filtration unit 4 are installed inside the filter bottle 2, the upper housing 21 and the lower housing 22 may be in a state where they cannot be disassembled.

[0069] like Figure 1 and Figure 2 As shown, the first isolation mechanism 1 extends along the axial direction. The first isolation mechanism 1 is generally cylindrical, with a narrowed end near the mouth of the filter bottle 2, and the other end extending to the bottom of the filter bottle 2. A first receiving space 23 is formed inside the first isolation mechanism 1. A second receiving space 24 is formed between the outer wall of the first isolation mechanism 1 and the inner wall of the filter bottle 2.

[0070] like Figure 1 and Figure 2 As shown, the first filter unit 3 is disposed in the first receiving space 23, and the second filter unit 4 is disposed in the second receiving space 24. The second filter unit 4 can be sleeved outside the first filter unit 3. For example, the second filter unit 4 can be sleeved around the first isolation mechanism 1, and the first isolation mechanism 1 can be sleeved around the first filter unit 3, thus indirectly forming that the second filter unit 4 is sleeved outside the first filter unit 3. The second filter unit 4 has an inlet end and an outlet end, which can face the two ends of the filter bottle 2 respectively. For example, the inlet end of the second filter unit 4 faces the end of the filter bottle 2 located at the bottle mouth, and the outlet end of the second filter unit 4 faces the end of the filter bottle 2 located at the bottle bottom. Of course, the inlet end of the second filter unit 4 can also face the end of the filter bottle 2 located at the bottle bottom, and the outlet end of the second filter unit 4 can face the end of the filter bottle 2 located at the bottle mouth.

[0071] like Figure 1 and Figure 2As shown, in one feasible implementation, the first filtration unit 3 can be a pre-filtration unit. The second filtration unit 4 can be a post-filtration unit. The filter element may include: a filter bottle interface assembly 7 installed at the bottle mouth of the filter bottle 2, the filter bottle interface assembly 7 having multiple ports, including at least a first port and a second port, the first port communicating with the gap between the first isolation mechanism 1 and the outer wall of the first filtration unit 3, and the second port communicating with the interior of the support frame 8. The bottle mouth may be located on the upper housing 21 of the filter bottle 2, and the filter bottle interface assembly 7 may be installed on the upper housing 21 of the filter bottle 2. The first isolation mechanism 1 may be connected to the filter bottle interface assembly 7. Raw water flows into the first receiving space 23 in the first isolation mechanism 1 of the filter bottle 2 through the first port of the filter bottle interface assembly 7, enters the inlet of the first filtration unit 3, is filtered by the first filtration unit 3 and then discharged from the outlet of the first filtration unit 3, and then flows out of the filter bottle 2 through the second port of the filter bottle interface assembly 7. After undergoing further treatment, the water flowing out of filter bottle 2 flows into the second receiving space 24 of filter bottle 2 through filter bottle interface assembly 7. The water enters the second filtration unit 4 from the inlet end near the bottle opening. The water must flow along the axis of filter bottle 2 through the second filtration unit 4 to be fully filtered by the second filtration unit 4, and then flows out from the outlet end of the second filtration unit 4 near the bottom of the bottle, and is discharged from filter bottle 2. The water flowing out from the outlet end of the second filtration unit 4 can flow out from the bottom of filter bottle 2, or it can flow out from the bottle opening of filter bottle 2 through the guide tube passing through the middle of the first filtration unit 3.

[0072] As a feasible option, such as Figure 1 and Figure 2 As shown, the filter element may include: a support frame 8 with a hollowed-out design, a first filter unit 3 sleeved on the support frame 8, raw water entering the first filter unit 3 from the outer wall of the first filter unit 3, being filtered by the first filter unit 3, and then flowing out from the inner wall of the first filter unit 3, and then flowing into the support frame 8 with a hollowed-out design and then flowing out of the filter bottle 2 from the second port of the filter bottle interface assembly 7.

[0073] Alternatively, the second filter unit 4 can be made of granular activated carbon. When the granular activated carbon has sufficient length along the axis of the filter bottle 2, it can effectively filter chloroform in the water, ensuring that the chloroform content of the filtered water fully complies with national standards. Preferably, the granular activated carbon needs to be at least 30 mm long along the axis of the filter bottle 2 to ensure that the removal rate of chloroform in the water reaches more than 95% during the filtration process, thus meeting national standards.

[0074] As an option, the first filter unit 3 can be made of PP cotton, which can be rolled up and wound onto the support frame 8. In other feasible embodiments, the first filter unit 3 can also be made of PP cotton and carbon fiber rolled together. This application does not impose specific limitations on the first filter unit 3, as long as it meets the requirement of being a pre-filter unit.

[0075] Alternatively, the filter element may include a guide tube (not shown in the figure) that passes through the middle of the first filter unit 3 along the axial direction of the filter bottle 2, thereby connecting to the outlet end of the second filter unit 4. Water flows out of the outlet end of the second filter unit 4 and enters the guide tube, then passes through the first filter unit 3, and finally flows out of the filter bottle 2 through the filter bottle interface assembly 7. In this way, all water flow in and out is through the bottle opening of the filter bottle 2, so that when installing or disassembling, the filter bottle interface assembly 7 at the bottle opening can be connected to the water purification device to achieve the connection of all water paths.

[0076] As a feasible option, such as Figure 1 and Figure 2 As shown, the filter element may include a third filter unit 5 disposed in the second receiving space 24, and the second filter unit 4 and the third filter unit 5 are arranged along the axial direction. The second filter unit 4 has a second water inlet and a second water outlet, and the third filter unit 5 has a third water inlet and a third water outlet, with the third water inlet connected to the second water outlet.

[0077] Water flows out from the outlet of the second filter unit 4, then enters the third filter unit 5 through the inlet. After being filtered by the third filter unit 5, it exits through the outlet of the third filter unit 5 into the guide pipe, passes through the first filter unit 3, and finally flows out of the filter bottle 2 through the filter bottle interface assembly 7. The third filter unit 5 is a post-filter cartridge. For example, when the second filter unit 4 can be made of granular activated carbon, the third filter unit 5 can be made of a microfiltration membrane 52, such as a folded multilayer microfiltration membrane 52. The third filter unit 5 is used to filter the carbon powder remaining in the water from the granular activated carbon to prevent the water flowing out of the filter cartridge from having black carbon powder.

[0078] Alternatively, the filter bottle 2 can have an outer shell (not shown) and an inner shell (not shown), with the area between the outer shell and the inner shell forming a partial second receiving space 24. A second filter unit 4 is disposed between the inner shell and the outer shell. The second filter unit 4 is sealed to the inner wall of the outer shell and to the outer wall of the inner shell. A first isolation mechanism 1 is inserted into the inner shell. The inner shell can be detachably connected to the outer shell or integrally formed. In the above embodiment, when the first filter unit 3 needs to be replaced, the first isolation mechanism 1 and the first filter unit 3 disposed therein can be pulled out of the filter bottle 2 together, and a new first filter unit 3 can be inserted. At this time, the first isolation mechanism 1 acts as the shell of the first filter unit 3. This method allows for quick replacement of the first filter unit 3 without replacing the second filter unit 4, significantly reducing the cost of filter replacement.

[0079] In another feasible implementation, such as Figure 1 and Figure 2 As shown, the filter element may include: a second isolation mechanism 6 sleeved outside the first isolation mechanism 1, the second isolation mechanism 6 isolating at least part of the second accommodating space 24 into a first annular space 241 located between the second isolation mechanism 6 and the first isolation mechanism 1, and a second annular space 242 located between the filter bottle 2 and the second isolation mechanism 6, the first annular space 241 and the second annular space 242 being connected.

[0080] In the above embodiment, the second filter unit 4 can be located in the first annulus 241 and / or in the second annulus 242. Alternatively, the structure of the second isolation mechanism 6 can be similar to that of the first isolation mechanism 1, extending along the axial direction. The second isolation mechanism 6 can be generally cylindrical, with one end near the mouth of the filter bottle 2 having a narrowed diameter. The other end of the first isolation mechanism 1 can extend to near the bottom of the filter bottle 2. The end of the second isolation mechanism 6 near the mouth of the filter bottle 2 can be connected to the filter bottle interface assembly 7. The filter bottle interface assembly 7 can have a third port and a fourth port, with the fourth port connected to the first annulus 241 and the third port connected to the second annulus 242.

[0081] In the above embodiment, the filter element may not include a flow guide tube. Water flowing in from the third or fourth port on the filter bottle interface assembly 7 at the bottle mouth of the filter bottle 2 flows towards the bottom end of the filter bottle 2 after passing through one of the first annulus 241 and the second annulus 242, and then flows back towards the end near the bottle mouth of the filter bottle 2 through the other of the first annulus 241 and the second annulus 242, finally flowing out from the third or fourth port on the filter bottle interface assembly 7 at the bottle mouth of the filter bottle 2. During the process of water passing through the first annulus 241 and the second annulus 242, it achieves the purpose of filtration through the second filtration unit 4.

[0082] As a feasible option, Figure 10 This is a top view of the filter bottle interface assembly in an embodiment of the present invention. Figure 11 for Figure 10 Cross-sectional view at point AA, as shown Figure 10 and Figure 11 As shown, the filter bottle interface assembly may include a filter bottle interface body 71. The end of the filter bottle interface body 71 facing the filter bottle body has a first port, a second port, a third port, and a fourth port. The end of the filter bottle interface body 71 facing away from the filter bottle body may have an interface hole unit 76. The interface hole unit 76 includes a first interface hole communicating with the first port, a second interface hole communicating with the second port, a third interface hole communicating with the third port, and a fourth interface hole communicating with the fourth port. A water-stopping mechanism 72 is disposed in at least some of the interface holes, and the water-stopping mechanism 72 is used to control the opening and closing of the interface holes. When the filter element is installed on the water circuit interface plate of the water purification device, Figure 12 This is a schematic diagram showing the open state of the interface hole unit of the filter bottle interface assembly in an embodiment of the present invention, as shown below. Figure 12 As shown, the water-stopping mechanism 72 changes the interface hole to the open state, thereby ensuring water flow between the filter element and the water interface plate. When the filter element is removed from the water interface plate of the water purification device, the water-stopping mechanism 72 changes the interface hole to the closed state, thus preventing residual water in the filter element from leaking out and affecting the user during replacement. To facilitate the insertion and connection of the first isolation mechanism, the second isolation mechanism, and the upper sealing cap tube onto the filter bottle interface body 71, the filter bottle interface body 71 has a first annular extension 73, a second annular extension 74, and a third annular extension 75 extending along the axial direction at one end facing the filter bottle body. The second annular extension 74 is located circumferentially outside the first annular extension 73, and the third annular extension 75 is located circumferentially inside the first annular extension 73. For example, the second isolation mechanism is inserted between the first annular extension 73 and the second annular extension 74, and the outer wall of the upper end of the second isolation mechanism is sealed to the inner wall of the second annular extension 74 by a sealing element. The first isolation mechanism is inserted into the second annular extension 74, and the outer wall of the upper end of the first isolation mechanism is sealed to the inner wall of the first annular extension 73 by a sealing element. The tube of the upper sealing cover is inserted into the third annular extension 75, and the outer wall of the tube of the upper sealing cover is sealed to the inner wall of the third annular extension 75 by a sealing element. The first port is located in the region between the third annular extension 75 and the first annular extension 73, and the second port is located in the inner region of the third annular extension 75. The fourth port is located in the region between the first annular extension 73 and the second annular extension 74, and the third port is located in the circumferentially outer region of the second annular extension 74.

[0083] In the above embodiments, such as Figure 1 and Figure 2 As shown, the filter element may include a third filter unit 5 disposed in the second receiving space 24. The second filter unit 4 and the third filter unit 5 may be arranged along the axial direction or along the radial direction of the filter bottle 2. Water passes through the first annulus 241 and the second annulus 242, sequentially through the second filter unit 4 and the third filter unit 5 to achieve filtration. The types of the second filter unit 4 and the third filter unit 5 can be selected as described above and will not be repeated here. There are various ways to specifically arrange the third filter unit 5 in the second receiving space 24, which will be further explained below.

[0084] In the first embodiment, the second filter unit 4 is disposed in the first annular space 241, and the third filter unit 5 is disposed in the second receiving space 24 between the end of the second isolation mechanism 6 and the bottom of the filter bottle 2. In this embodiment, the second isolation mechanism 6 only isolates part of the second receiving space 24 into the first annular space 241 located between the second isolation mechanism 6 and the first isolation mechanism 1, and the second annular space 242 located between the filter bottle 2 and the second isolation mechanism 6. The second receiving space 24 near the bottom of the filter bottle 2 is not separated by the second isolation mechanism 6. Water flowing in from the fourth port on the filter bottle interface assembly 7 at the bottle mouth of the filter bottle 2 is filtered by the second filter unit 4 in the first annular space 241 and flows to the end near the bottom of the filter bottle 2. Then it is filtered by the third filter unit 5 in the second receiving space 24 near the bottom of the filter bottle 2. After that, it flows back to the end near the bottle mouth of the filter bottle 2 in the second annular space 242 and finally flows out from the third port on the filter bottle interface assembly 7 at the bottle mouth of the filter bottle 2.

[0085] In a second embodiment, as feasible, the second filter unit 4 and the third filter unit 5 can be jointly disposed in the first annular cavity 241. If the second filter unit 4 is located near the mouth of the filter bottle 2, water flowing in from the fourth port of the filter bottle interface assembly 7 at the mouth of the filter bottle 2 will flow out from the third port of the filter bottle interface assembly 7 at the mouth of the filter bottle 2. If the second filter unit 4 is located near the bottom of the filter bottle 2, water flowing in from the third port of the filter bottle interface assembly 7 at the mouth of the filter bottle 2 will flow out from the fourth port of the filter bottle interface assembly 7 at the mouth of the filter bottle 2. As feasible, the second filter unit 4 and the third filter unit 5 can be jointly disposed in the second annular cavity 242. If the second filter unit 4 is located near the mouth of the filter bottle 2, water flowing in from the third port of the filter bottle interface assembly 7 at the mouth of the filter bottle 2 will flow out from the fourth port of the filter bottle interface assembly 7 at the mouth of the filter bottle 2. If the second filter unit 4 is located close to the bottom of the filter bottle 2, the water that flows in from the fourth port of the filter bottle interface assembly 7 at the mouth of the filter bottle 2 will flow out from the third port of the filter bottle interface assembly 7 at the mouth of the filter bottle 2.

[0086] In the third implementation, such as Figure 1and Figure 2 As shown, the second filter unit 4 is disposed in the second annular space 242, and the third filter unit 5 is disposed in the second receiving space 24 between the end of the second isolation mechanism 6 and the bottom end of the filter bottle 2. In this embodiment, the second isolation mechanism 6 only isolates part of the second receiving space 24 into a first annular space 241 located between the second isolation mechanism 6 and the first isolation mechanism 1, and a second annular space 242 located between the filter bottle 2 and the second isolation mechanism 6. The second receiving space 24 near the bottom of the filter bottle 2 is not separated by the second isolation mechanism 6. Water flowing in from the third port on the filter bottle interface assembly 7 at the bottle mouth of the filter bottle 2 is filtered by the second filter unit 4 in the second annular space 242 and flows to the end near the bottom of the filter bottle 2. Then it is filtered by the third filter unit 5 in the second receiving space 24 near the bottom of the filter bottle 2. After that, it flows back to the end near the bottle mouth of the filter bottle 2 in the first annular space 241 and finally flows out from the third port on the filter bottle interface assembly 7 at the bottle mouth of the filter bottle 2.

[0087] In the fourth embodiment, the second filter unit 4 can be located within the first annular space 241, and the third filter unit 5 can be located within the second annular space 242. Alternatively, the second filter unit 4 can be located within the second annular space 242, and the third filter unit 5 can be located within the first annular space 241. As feasible, the second filter unit 4 and the third filter unit 5 can be arranged radially along the filter bottle, i.e., the second filter unit 4 and the third filter unit 5 can be located at the same height, thus increasing the filtration length in the axial direction as water flows through the second filter unit 4 and the third filter unit 5. As feasible, the second filter unit 4 and the third filter unit 5 can be arranged axially, which can be achieved by having different diameters for the upper and lower parts of the second isolation mechanism 6, and the second filter unit 4 and the third filter unit 5 can be located at different heights. For example, the second filter unit 4 can be positioned between the upper part of the second isolation mechanism 6 and the filter bottle 2, and the third filter unit 5 can be positioned between the lower part of the second isolation mechanism 6 and the filter bottle 2; alternatively, the second filter unit 4 can be positioned between the lower part of the second isolation mechanism 6 and the filter bottle 2, and the third filter unit 5 can be positioned between the upper part of the second isolation mechanism 6 and the first isolation mechanism 1.

[0088] The second filter unit 4 and the third filter unit 5 can be arranged along the axial direction or implemented in other ways. For example, the side wall of the second isolation mechanism 6 has a guide hole connecting the first annular space 241 and the second annular space 242. The guide hole is located as close as possible to the bottom of the bottle. The third filter unit 5 is layered and can be located on the side wall of the second isolation mechanism 6 at the guide hole, which can be the inner side wall or the outer side wall. The water filtered by the second filter unit 4 flows through the guide hole to the annular space on the other side, and is filtered by the third filter unit 5 while flowing through the guide hole. In this embodiment, the end of the second isolation mechanism 6 near the bottom of the bottle needs to be sealed to the bottom of the bottle to prevent leakage that would prevent the water filtered by the second filter unit 4 from flowing through the guide hole to the annular space on the other side.

[0089] In the above-mentioned embodiments where the filter element may not include the guide tube, by setting a second isolation mechanism 6 sleeved outside the first isolation mechanism 1, the second receiving space 24 is isolated from the first annular space 241 and the second annular space 242. In this way, the water flowing into the filter bottle 2 from the bottle mouth and filtered by the second filtration unit 4 and / or the third filtration unit 5 can flow back to the bottle mouth of the filter bottle 2 and flow out. This allows all water to flow in or out through the bottle mouth of the filter bottle 2. Thus, when the filter bottle 2 is installed or disassembled, once the filter bottle interface assembly 7 at the bottle mouth of the filter element is connected to the water purification device, all water paths can be connected.

[0090] Furthermore, since the middle of the first filter unit 3 does not require a guide pipe, meaning the middle of the support frame 8 supporting the first filter unit 3 cannot have a guide pipe, the diameter of the support frame 8 can be greatly reduced. This allows for an increase in the radial thickness of the first filter unit 3. Since the raw water enters the first filter unit 3 from its outer wall, is filtered, and then flows out from its inner wall, the filtration occurs radially. Therefore, increasing the radial thickness of the first filter unit 3 significantly improves its filtration efficiency. This is especially true when the first filter unit 3 is made of rolled PP cotton; increasing its radial thickness further enhances the filtration effect and extends its service life. When the first filter unit 3 filters water, impurities are first intercepted on the outer ring of the first filter unit 3 over time. The intercepted impurities remain on the PP cotton of the first filter unit 3, decreasing in size from the outside to the inside. As the radial thickness of the first filter unit 3 increases, the PP cotton closer to the inner ring becomes cleaner and can still effectively filter water. It takes a longer time before it is affected, until the lifespan of the first filter unit 3 ends. Of course, if the water flow rate of the pre-filter is not affected, the radial dimension of the support frame 8 can be kept unchanged.

[0091] As a feasible option, such as Figure 1 and Figure 2 As shown, in order to ensure that the first annular space 241 and the second annular space 242 have stable and controllable space, so as to facilitate the filling of the second filter unit 4 and its use as a flow channel, Figure 4 This is a schematic diagram of the structure of the second isolation mechanism in an embodiment of the present invention. Figure 5 for Figure 4 Cross-sectional view of AA, as shown Figure 4 and Figure 5 As shown, the outer wall of the second isolation mechanism 6 has multiple radially protruding second support portions 61. These second support portions 61 extend along the axial direction to ensure that water or the second filter unit 4 can pass between adjacent second support portions 61. The outer wall of the second support portion 61 abuts against the inner wall of the filter bottle 2, thereby achieving a radially limiting effect on the second isolation mechanism 6. Similarly, Figure 3 This is a schematic diagram of the structure of the first isolation mechanism in an embodiment of the present invention, as shown below. Figure 3 As shown, the outer wall of the first isolation mechanism 1 has multiple radially protruding first support portions 11, which extend along the axial direction to ensure that water can pass between adjacent first support portions 11. The outer wall of the first support portion 11 abuts against the inner wall of the second isolation mechanism 6, thereby achieving a limiting effect of the first isolation mechanism 1 in the radial direction. Preferably, the lower inner wall of the second isolation mechanism 6 has a groove 63 corresponding to the first support portion 11, and the first support portion 11 can be embedded in the groove 63 at the lower end of the second isolation mechanism 6. In this way, the first isolation mechanism 1 and the second isolation mechanism 6 achieve a certain limiting effect in both the axial and circumferential directions.

[0092] As a feasible option, such as Figure 1 and Figure 2 As shown, when the third filtration unit 5 includes a microfiltration membrane 52, an ultrafiltration membrane, or a softer filter material such as PP cotton that is not easily fixed, in order to effectively fix the filter material and allow water to pass through the filter material completely and effectively, and to prevent leakage, Figure 6 This is a schematic diagram of the structure of the receiving component in an embodiment of the present invention, as shown below. Figure 6 As shown, the third filtration unit 5 may include: a receiving member 51, whose outer wall has an annular receiving groove 511, and filter materials such as microfiltration membranes 52, ultrafiltration membranes, or PP cotton are stacked in the receiving groove 511. The membrane surface of the filter material faces the radial direction of the filter bottle 2, and water flows through the filter material along the radial direction of the filter bottle 2 for filtration. The bottom of the receiving groove 511 is connected to the inner wall of the receiving member 51 through a water guide hole 512, so that the water filtered by the filter material can be discharged. In addition, the bottom of the receiving groove 511 needs to abut against the filter material so that the filter material can withstand higher water pressure to improve the filtration speed.

[0093] In the third implementation, such as Figure 1 and Figure 2 As shown, there is at least a partial gap between the receiving member 51 and the inner wall of the filter bottle 2, so that the third water inlet of the third filter unit 5 is connected to the second annular space 242, and the third water inlet of the third filter unit 5 is located at the outer wall of the receiving member 51. In this way, the water discharged after being filtered by the second filter unit 4 can flow through the gap into the third water inlet of the third filter unit 5, that is, into the annular receiving groove 511 on the outer wall of the receiving member 51.

[0094] The inner wall of the receiving member 51 has at least a partial gap with the first isolation mechanism 1 so that the third outlet of the third filter unit 5 is connected to the first annulus 241, thereby allowing water discharged from the third outlet of the third filter unit 5 to flow into the first annulus 241 and finally flow out of the filter bottle 2 from the fourth port of the filter bottle interface assembly 7.

[0095] As a feasible option, such as Figure 6 As shown, the receiving member 51 is generally annular, with an upper extension 513 extending along the axis of the filter bottle 2 at its upper end and a lower extension 514 extending along the axis of the filter bottle 2 at its lower end. The lowermost end of the second isolation mechanism 6 may have a stepped portion 62, which increases the diameter of the lowermost end of the second isolation mechanism 6, allowing the first support portion 11 of the first isolation mechanism 1 to pass smoothly through the lowermost end of the second isolation mechanism 6 and embed into the groove 63 of the second isolation mechanism 6. The upper extension 513 of the receiving member 51 can be embedded within the stepped portion 62 at the lowermost end of the second isolation mechanism 6, with the upper extension 513 located between the stepped portion 62 and the first isolation mechanism 1. The outer wall of the upper extension 513 cooperates with the stepped portion 62 to achieve a sealing state. Figure 1 and Figure 2 As shown, to improve the sealing between the two, a sealing element, such as a sealing ring, is provided between the outer wall of the upper extension 513 and the inner wall of the stepped portion 62. At least a portion of the inner wall of the upper extension 513 and the outer wall of the first isolation mechanism 1 have a gap, so that the third outlet of the third filter unit 5 is connected to the first annulus 241.

[0096] like Figure 1 and Figure 2As shown, the lower end of the lower extension 514 abuts against the bottom of the filter bottle 2 and is pressed tightly against it, or the outer wall of the lower extension 514 abuts against the inner wall of the bottom of the filter bottle 2 or the inner wall of the annular protrusion on the bottom surface of the bottle, so that the end of the lower extension 514 near the filter bottle 2 is sealed as much as possible with the bottom of the bottle, thereby preventing the water discharged from the second filter unit 4 from leaking directly from the end of the receiving member 51 near the filter bottle 2 and the bottom of the bottle without being filtered by the third filter unit 5 and entering the first annular space 241.

[0097] As a feasible option, such as Figure 6 As shown, the inner wall of the receiving member 51 may have a snap-fit ​​structure 515 and a limiting groove 516 extending along the axial direction. The lower end of the first isolation mechanism 1 may have a recess 13 that cooperates with the snap-fit ​​structure 515, and the snap-fit ​​structure 515 can be inserted into the recess 13 to achieve positioning in the axial direction. The lower end of the first isolation mechanism 1 may have a limiting part 12 that cooperates with the limiting groove 516, and the limiting part 12 is inserted into the limiting groove 516 to achieve circumferential limiting.

[0098] As a feasible option, Figure 7 This is a schematic diagram of the structure of the accommodating member in another embodiment of the present invention, as shown below. Figure 7 As shown, the difference between the receiving member in this embodiment and the receiving member in the previous embodiment is that the inner wall of the receiving member 51 does not have a snap-fit ​​structure 515, nor does it have a limiting groove 516 extending along the axial direction. Correspondingly, the lower end of the first isolation mechanism 1 may not have a recessed portion 13 that cooperates with the snap-fit ​​structure 515. In this embodiment, the outer wall of the lower extension portion 514 of the receiving member 51 abuts against the inner wall of the bottom of the filter bottle 2 or the inner wall of the annular protrusion on the bottom surface of the bottle to achieve a seal. In order to achieve the limiting of the receiving member 51 in the axial direction, there may be an annular groove and a sealing member, such as a sealing ring, disposed in the annular groove between the outer wall of the lower extension portion 514 of the receiving member 51 and the inner wall of the bottom of the filter bottle 2 or the inner wall of the annular protrusion on the bottom surface of the bottle. Under the action of the sealing member, the friction between the receiving member 51 and the filter bottle 2 increases significantly, and the two cannot easily displace each other. Similarly, an annular groove and a sealing element, such as a sealing ring, are provided between the outer wall of the outer extension 513 of the receiving member 51 and the inner wall of the stepped portion 62. Under the action of the sealing element, the friction between the receiving member 51 and the second isolation mechanism 6 increases significantly, making it difficult for them to easily move, thereby limiting the second isolation mechanism 6 in the axial direction. The upper end of the outer extension 513 of the receiving member 51 abuts against the first support portion 11 on the first isolation mechanism 1, thereby limiting the first isolation mechanism 1 in the axial direction.

[0099] like Figure 1 and Figure 2As shown, when the second filter unit 4 is made of granular activated carbon and the granular activated carbon fills the second annular cavity 242, the lower end of the second annular cavity 242 is blocked by the receiving member 51, thereby limiting the granular activated carbon. The upper end of the second annular cavity 242 also needs to limit the granular activated carbon. Therefore, as feasible, the filter element may include a blocking member 12 disposed in the second annular cavity 242. The blocking member 12 is annular and is disposed above the second filter unit 4 to block the granular activated carbon in the second filter unit 4, preventing the granular activated carbon from entering the filter bottle interface assembly 7. The inner wall of the blocking member 12 abuts against the outer wall of the second isolation mechanism 6, and the outer wall of the blocking member 12 abuts against the inner wall of the filter bottle 2. In order for water to pass through the blocking member 12, Figure 8 This is a schematic diagram of the blocking component in an embodiment of the present invention, as shown below. Figure 8 As shown, the blocking member 12 has multiple openings 121 extending along the axial direction and distributed circumferentially around the axis. Since the width of the openings 121 may be too large, smaller particles of activated carbon may enter the filter bottle interface assembly 7. Preferably, a filter screen can be provided on the openings 121 to block smaller particles of activated carbon from passing through the openings 121.

[0100] like Figure 1 and Figure 2 As shown, as feasible, the middle part of the support frame 8 can be hollow. After the water is filtered by the first filter unit 3, it flows through the support frame 8 and into the hollow middle part of the support frame 8. Then it flows upward along the axis and finally flows out of the filter bottle 2 along the tube of the upper sealing cover of the first filter unit 3 and the filter bottle interface assembly 7. Figure 9 This is a schematic diagram of the lower seal in another embodiment of the present invention, as shown below. Figure 1 , Figure 2 and Figure 9 As shown, the filter element may include: a lower sealing member 9 that seals the end of the first filter unit 3 away from the bottle opening, and the lower sealing member 9 is sealed to the first isolation mechanism 1. Alternatively, as... Figure 1 and Figure 2As shown, the lower seal 9 has a protrusion 91 that extends into the middle of the support frame 8. The protrusion 91 can occupy a portion of the lower volume of the middle of the support frame 8, and this volume can be determined by the height of the protrusion 91. When the filter element may include a fourth filter unit disposed in the middle of the support frame 8, the water filtered by the first filter unit 3 flows upward into the middle of the support frame 8 and is then filtered by the fourth filter unit. In order to limit the fourth filter unit and prevent it from moving up and down arbitrarily, the fourth filter unit generally needs to fill the entire middle of the support frame 8, which greatly increases the amount of the fourth filter unit used. This will cause excessive use and waste of the fourth filter unit and greatly increase the cost. The presence of the protrusion 91 can hold the fourth filter unit from below, effectively reducing the amount of the fourth filter unit used. Under the premise of ensuring that all the water flowing upward into the middle of the support frame 8 is filtered by the fourth filter unit, the cost is greatly reduced.

[0101] like Figure 1 and Figure 9 As shown, as a feasible embodiment, a channel 10 is formed within the lower seal 9, which connects the third water outlet of the third filter unit 5 and the gap between the first isolation mechanism 1 and the outer wall of the first filter unit 3. A one-way valve 11 is provided in the channel 10, guiding water from the third water outlet of the third filter unit 5 to the gap between the first isolation mechanism 1 and the outer wall of the first filter unit 3. Water filtered by the third filter unit 5 can flow back to the inlet of the first filter unit 3 through the channel 10. In this embodiment, the lower end of the lower seal 9 has an extension extending radially outward, and the lower end of the first isolation mechanism 1 abuts against the extension. A seal can be provided between the first isolation mechanism 1 and the outer wall of the lower seal 9 to ensure that water in the first receiving space 23 does not leak downward. A guide groove extending radially is formed on the lower end surface of the lower seal 9; multiple guide grooves can be provided and distributed circumferentially. Water discharged from the third outlet of the third filter unit 5 through the guide channel flows downward to the bottom of the filter bottle 2 through at least part of the gap between the inner wall of the receiving member 51 and the first isolation mechanism 1, and then flows to the channel 10 inside the lower seal member 9 through the guide channel on the lower end face of the lower seal member 9.

[0102] like Figure 2As shown, as a feasible embodiment, a channel 10 is formed within the first isolation mechanism 1, located at the end of the first isolation mechanism 1 near the mouth of the filter bottle 2. The channel 10 connects the third water outlet of the third filter unit 5 and the gap between the first isolation mechanism 1 and the first filter unit 3. A one-way valve 11 is provided in the channel 10, which guides the flow from the third water outlet of the third filter unit 5 to the gap between the outer walls of the first isolation mechanism 1 and the first filter unit 3. Water filtered by the third filter unit 5 can flow back to the inlet of the first filter unit 3 through the channel 10 when passing through the first annulus 241 to its upper end. In this embodiment, the channel 10 extends generally in the radial direction, with one end of the channel 10 connected to the outer wall of the first isolation mechanism 1 and the other end connected to the upper end of the inner wall of the first isolation mechanism 1. When the water filtered by the third filtration unit 5 flows back, most of the filtered water flows directly back to the upper end of the outer wall of the first filtration unit 3 and then directly enters the first filtration unit 3 for filtration and flows out. This means that less of the lower-quality water that originally remained in the first filtration unit 3, between the outer wall of the first filtration unit 3 and the first isolation mechanism 1, and in the middle and lower parts of the support frame 8 will mix with the water that flows back through the channel 10 after filtration by the third filtration unit 5, resulting in a decrease in the quality of the water flowing back through the channel 10 after filtration by the third filtration unit 5. Here, "lower quality" specifically refers to water that has not undergone complete multi-stage filtration; it has only been filtered by the first filtration unit 3 or not, and cannot reach the quality of pure water.

[0103] This application also proposes a water purification device, which includes any of the filter cartridges described above. The water purification device may further include a water purification filter cartridge, the inlet of which is connected to a first filtration unit 3, and the outlet of which is connected to the inlet of a second filtration unit 4. Water filtered by the first filtration unit 3 in the filter cartridge is discharged from the filter cartridge and then enters the water purification filter cartridge for further filtration. Afterward, the water is input into the filter cartridge and filtered again by the second filtration unit 4 and the third filtration unit 5 before being discharged from the filter cartridge. Alternatively, the water purification filter cartridge may include an RO membrane filter cartridge or a nanofiltration membrane filter cartridge, etc., capable of finely filtering water for user use.

[0104] As a feasible option, the water filtered by the third filter unit 5 can be returned to the inlet of the first filter unit 3 through the channel 10. Then, this water can be used to flush the raw water side of the water purifier cartridge, replacing the raw water on the raw water side of the water purifier cartridge with purified water, so as to avoid the problem of TDS increase in the first cup of water output after the water purifier cartridge has been stored for a long time without being used.

[0105] This application also proposes a method for assembling a filter element, which may include the following steps:

[0106] The first filter unit 3, which has a support frame 8, is installed into the first isolation mechanism 1. Specifically, the first filter unit 3 is first installed onto the support frame 8 by winding or sleeve, and then the upper sealing cap and the lower sealing element 9 are respectively installed at the upper and lower ends of the first filter unit 3. If the lower sealing element 9 has a protrusion 91, the protrusion 91 of the lower sealing element 9 can be inserted into the middle of the support frame 8, and the lower sealing element 9 can seal the end of the first filter unit 3 away from the bottle opening. If a one-way valve 11 needs to be installed in the lower sealing element 9, the one-way valve 11 is pre-installed into the channel 10 in the lower sealing element 9. Then, the first filter unit 3 is installed into the first isolation mechanism 1 through the lower opening 121.

[0107] The third filter unit 5 and the second isolation mechanism 6 are installed outside the first isolation mechanism 1, forming a first annular space 241 between the second isolation mechanism 6 and the first isolation mechanism 1. The first annular space 241 is connected to the third filter unit 5. Specifically, when the third filter unit 5 needs to be arranged along the axial direction with the second filter unit 4, it is feasible to first sleeve the third filter unit 5 onto the first isolation mechanism 1 from the lower end of the first isolation mechanism 1, with the upper end of the third filter unit 5 abutting against the first support portion 11 of the first isolation mechanism 1. Then, the second isolation mechanism 6 is sleeved outside the first isolation mechanism 1 from the upper end of the first isolation mechanism 1, with the first support portion 11 of the first isolation mechanism 1 abutting against the stepped portion 62 of the second isolation mechanism 6. The lower end of the second isolation mechanism 6 is sleeved outside the upper outer extension 513 of the receiving member 51 of part of the third filter unit 5, so that the outer wall of the upper outer extension 513 and the inner wall of the stepped portion 62 are tightly sealed by a sealing member. When the third filter unit 5 needs to be arranged radially with the second filter unit 4 in the filter bottle, it is feasible to install the third filter unit 5 on the outer wall of the first isolation mechanism 1, and then fit the second isolation mechanism 6 over the first isolation mechanism 1 from its upper end, with the third filter unit 5 located between the first isolation mechanism 1 and the second isolation mechanism 6. Alternatively, the third filter unit 5 can be installed on the inner or outer wall of the guide hole of the second isolation mechanism 6, and the second isolation mechanism 6 can be fitted over the first isolation mechanism 1 from its upper end, thus allowing the third filter unit 5 and the second filter unit 4 to be arranged radially in the filter bottle.

[0108] The first filter unit 3, the first isolation mechanism 1, the third filter unit 5, and the second isolation mechanism 6, assembled together, are installed into the lower housing 22 of the filter bottle 2, which has a bottom. A second annular space 242 is formed between the second isolation mechanism 6 and the lower housing. In one feasible embodiment, when the third filter unit 5 needs to be arranged axially with the second filter unit 4, the first filter unit 3, the first isolation mechanism 1, the third filter unit 5, and the second isolation mechanism 6 are installed from the upper end of the lower housing 22 of the filter bottle 2 into the lower housing 22. The third filter unit 5 is positioned between the bottom and the first isolation mechanism 1. A second annular space 242 is formed between the second isolation mechanism 6 and the lower housing 22. The lower end of the third filter unit 5 abuts against the bottom of the lower housing 22, and the upper end of the third filter unit 5 is abutted by the first support portion 11 of the first isolation mechanism 1, thereby limiting the third filter unit 5 in the axial direction. Because the second isolation mechanism 6 has a second support portion 61, the second isolation mechanism 6 is limited in the radial direction with the lower housing 22, thus forming a spatially stable second annular space 242. When the third filter unit 5 needs to be arranged radially with the second filter unit 4 in the filter bottle, it is feasible to install the third filter unit 5 on the inner or outer side wall of the guide hole of the second isolation mechanism 6, and install the first filter unit 3, the first isolation mechanism 1, the third filter unit 5 and the second isolation mechanism 6 assembled together from the upper end of the lower housing 22 with the bottom of the filter bottle 2 into the lower housing 22, with the lower end of the second isolation mechanism 6 abutting against the bottom of the filter bottle 2 to seal it; it is also feasible to install the third filter unit 5 between the first isolation mechanism 1 and the second isolation mechanism 6, and install the first filter unit 3, the first isolation mechanism 1, the third filter unit 5 and the second isolation mechanism 6 assembled together from the upper end of the lower housing 22 with the bottom of the filter bottle 2 into the lower housing 22, with at least a partial gap between the lower end of the second isolation mechanism 6 and the bottom of the filter bottle 2.

[0109] The second filter unit 4 is filled into the second annular cavity 242, allowing the second filter unit 4 and the third filter unit 5 to be arranged along the axial direction or along the radial direction of the filter bottle. The second filter unit 4, which can be granular activated carbon, is filled into the second annular cavity 242 through the upper end of the lower housing 22 of the filter bottle 2. When the third filter unit 5 needs to be arranged with the second filter unit 4 along the radial direction of the filter bottle, such as... Figure 1 and Figure 2 As shown, the lower end of the granular activated carbon can be blocked by the containment 51 of the third filter unit 5.

[0110] After the second filter unit 4 is filled, the upper housing 21 and lower housing 22 of the filter bottle 2 are joined together, and the filter bottle interface assembly 7 is installed at the bottle mouth of the filter bottle 2. The filter bottle interface assembly 7 is then connected with the first isolation mechanism 1 and the second isolation mechanism 6. Specifically, after the second filter unit 4 is filled, the blocking member 12 can be installed in the second annulus 242, positioned above the second filter unit 4, to block the granular activated carbon in the second filter unit 4. Then, the upper housing 21 and lower housing 22 of the filter bottle 2 are joined together, with part of the inner wall of the upper housing 21 abutting against the blocking member 12, thereby limiting the blocking member 12 in the axial direction and preventing it from moving upward. During the above process, the filter bottle interface assembly 7 can be installed at the bottle mouth of the upper housing 21, thereby achieving connection with the tube of the first isolation mechanism 1, the second isolation mechanism 6, and the upper sealing cap. During the connection process, the first isolation mechanism 1 and the second isolation mechanism 6 can be limited in the axial direction.

[0111] The filter element assembly method in this application enables rapid assembly of the filter element and allows for the limiting of various components in the filter element in the radial and axial directions during the entire assembly process, thereby ensuring the reliability of the entire filter element during operation.

[0112] 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.

[0113] 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 filter element, characterized in that, The filter element includes: A filter bottle having an axis, the filter bottle comprising an upper housing and a lower housing; A first isolation mechanism is disposed inside the filter bottle, which isolates the space inside the filter bottle into a first accommodating space located within the first isolation mechanism and a second accommodating space located between the outer sidewall of the first isolation mechanism and the inner sidewall of the filter bottle. A first filter unit disposed in the first accommodating space; A second filter unit disposed in the second accommodating space; A second isolation mechanism is fitted outside the first isolation mechanism. The second isolation mechanism isolates at least part of the second accommodating space into a first annulus between the second isolation mechanism and the first isolation mechanism, and a second annulus between the filter bottle and the second isolation mechanism. The first annulus and the second annulus are connected.

2. The filter element according to claim 1, characterized in that, The filter element further includes a third filter unit disposed in the second accommodating space.

3. The filter element according to claim 1, characterized in that, The second filter unit is located in the first annular space and / or in the second annular space.

4. The filter element according to claim 2, characterized in that, The second filter unit and the third filter unit are arranged along the axial direction or along the radial direction of the filter bottle.

5. The filter element according to claim 4, characterized in that, The second filter unit is disposed in the second annular space, and the third filter unit is disposed in the second accommodating space between the end of the second isolation mechanism and the bottom end of the filter bottle.

6. The filter element according to claim 4, characterized in that, The second filter unit is disposed in the first annular space, and the third filter unit is disposed in the second accommodating space between the end of the second isolation mechanism and the bottom end of the filter bottle.

7. The filter element according to claim 2, characterized in that, The second filter unit and the third filter unit are jointly disposed in the first annulus or the second annulus.

8. The filter element according to claim 2, characterized in that, The second filter unit is disposed in the first annular space, and the third filter unit is disposed in the second annular space; or the second filter unit is disposed in the second annular space, and the third filter unit is disposed in the first annular space.

9. The filter element according to any one of claims 2 to 8, characterized in that, The second filtration unit has a second inlet and a second outlet, with the second inlet and the second outlet facing the two ends of the filter bottle, respectively.

10. The filter element according to claim 2, characterized in that, The second filter unit has a second inlet and a second outlet, and the third filter unit has a third inlet and a third outlet, with the third inlet connected to the second outlet.

11. The filter element according to claim 1, characterized in that, The filter element includes: a filter bottle interface assembly installed at the bottle mouth of the filter bottle, the filter bottle interface assembly having a third port and a fourth port, the fourth port being connected to the first annulus, and the third port being connected to the second annulus.

12. The filter element according to claim 1, characterized in that, The filter element further includes: a support frame with a hollowed-out design, the first filter unit being sleeved on the support frame, the first water inlet of the first filter unit being located on the outer side wall of the first filter unit, and the first water outlet of the first filter unit being located on the inner side wall of the first filter unit.

13. The filter element according to claim 12, characterized in that, The filter element includes: a filter bottle interface assembly installed at the bottle mouth of the filter bottle, the filter bottle interface assembly having a first port and a second port, the first port and the first isolation mechanism communicating with the gap between the outer wall of the first filter unit, and the second port communicating with the interior of the support frame.

14. The filter element according to claim 3, characterized in that, The second filter unit is made of granular activated carbon, which fills the second annulus and / or the first annulus.

15. The filter element according to claim 2, characterized in that, The third filtration unit includes a microfiltration membrane, an ultrafiltration membrane, or PP cotton.

16. The filter element according to claim 15, characterized in that, The third filtration unit further includes: a receiving member having an annular receiving groove on its outer side wall, wherein the microfiltration membrane, ultrafiltration membrane, or PP cotton is arranged in the receiving groove in a stacked manner, the bottom of the receiving groove is connected to the inner side wall of the receiving member through a water guide hole, and there is at least a partial gap between the receiving member and the inner side wall of the filter bottle so that the third water inlet of the third filtration unit is connected to the second annular space, and the third water inlet of the third filtration unit is located at the outer side wall of the receiving member; there is at least a partial gap between the inner side wall of the receiving member and the first isolation mechanism so that the third water outlet of the third filtration unit is connected to the first annular space.

17. The filter element according to claim 2, characterized in that, The filter element further includes: a support frame with a hollowed-out design, on which the first filter unit is sleeved, and the middle part of the support frame is hollow; and a lower sealing member for sealing the end of the first filter unit away from the bottle opening, the lower sealing member having a protrusion that extends into the middle part of the support frame.

18. The filter element according to claim 17, characterized in that, A channel is formed inside the lower seal, which connects the third water outlet of the third filter unit and the gap between the first isolation mechanism and the outer wall of the first filter unit; a one-way valve is provided in the channel to guide the flow from the third water outlet of the third filter unit to the gap between the first isolation mechanism and the outer wall of the first filter unit.

19. The filter element according to claim 17, characterized in that, A channel is formed within the first isolation mechanism. The channel is located at one end of the first isolation mechanism near the bottle opening of the filter bottle. The channel can connect the third water outlet of the third filter unit and the gap between the first isolation mechanism and the first filter unit. A one-way valve is provided in the channel to guide the flow from the third water outlet of the third filter unit to the gap between the outer walls of the first isolation mechanism and the first filter unit.

20. The filter element according to claim 1, characterized in that, The first filter unit is a pre-filter unit, which is made of rolled PP cotton or PP cotton and carbon fiber.

21. A water purification device, characterized in that, The water purification device includes a filter element as described in any one of claims 1 to 20.

22. The water purification device according to claim 21, characterized in that, The water purification device further includes a water purification filter element, the inlet of which is connected to the first filtration unit, and the outlet of which is connected to the second water inlet of the second filtration unit.

23. The water purification device according to claim 22, characterized in that, The water purification filter element includes an RO membrane filter element or a nanofiltration membrane filter element.

24. A method for assembling a filter element, characterized in that, The assembly method of the filter element includes: The first filter unit with a support frame is installed into the first isolation mechanism; The third filter unit and the second isolation mechanism are installed outside the first isolation mechanism, and a first annular space is formed between the second isolation mechanism and the first isolation mechanism. The first annular space is connected to the third filter unit. The first filter unit, the first isolation mechanism, the third filter unit, and the second isolation mechanism, which are assembled together, are installed into the lower housing with a bottom of the filter bottle, and a second annular space is formed between the second isolation mechanism and the lower housing; The second filter unit is filled into the air of the second ring; After the second filter unit is filled, the upper and lower housings of the filter bottle are connected, and the filter bottle interface assembly is installed at the bottle mouth of the filter bottle. The filter bottle interface assembly is connected with the first isolation mechanism and the second isolation mechanism.

25. The method for assembling a filter element according to claim 24, characterized in that, The first filter unit, the first isolation mechanism, the third filter unit, and the second isolation mechanism, which are assembled together, are installed into the lower housing of the filter bottle, which has a bottom. The third filter unit is confined between the bottom and the first isolation mechanism, and a second receiving space is formed between the second isolation mechanism and the lower housing. A second filter unit is filled into the second accommodating space, and the second filter unit and the third filter unit are arranged along the axial direction.

26. The method for assembling a filter element according to claim 24, characterized in that, The assembly method of the filter element further includes: The protrusion of the lower seal extends into the middle of the support frame, and the lower seal seals the end of the first filter unit away from the bottle opening.

27. The method for assembling a filter element according to claim 24, characterized in that, The second filtration unit is granular activated carbon.

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