Composite filter element and water treatment equipment having the same

Abstract

The present invention discloses a composite filter element and a water treatment device having the same, wherein the composite filter element comprises: a filter housing, a filter cartridge and an isolation assembly for isolating a first filter channel and a second filter channel, wherein the filter housing is defined with an installation cavity; a filter cartridge, wherein the filter cartridge is arranged in the installation cavity and forms a first filter channel and a second filter channel isolated from each other with the filter housing, wherein a first filter element for filtering a fluid in the first filter channel is arranged in the first filter channel, and a second filter element for filtering a fluid in the second filter channel is arranged in the second filter channel; and the isolation assembly comprises a top cover, wherein the top cover is pivotally arranged in the filter cartridge, a slide groove is arranged on one of the filter cartridge and the top cover, and a matching portion connected to the slide groove is arranged on the other of the filter cartridge and the top cover, and the matching portion can be slidably matched with the slide groove along the circumference of the filter cartridge. The composite filter element according to the present invention has a simple and compact structure, can reduce the difficulty of disassembly and assembly, and is not easy to leak.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment equipment, and more specifically, to a composite filter element and water treatment equipment having the composite filter element. Background Art

[0002] In order to improve the filtering effect, the water treatment equipment in the related technology is provided with multiple filter elements, and the multiple filter elements are connected by pipelines, which are prone to water leakage and poor filtering effect. The pipeline layout is complicated and occupies a large space. Moreover, the structure is not compact, resulting in a large volume and inconvenient disassembly and assembly. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a composite filter element, which has a simple and compact structure, good filtering effect and small space occupation.

[0004] The invention also discloses a water treatment device having the composite filter element.

[0005] 20. The filter element as claimed in claim 19, wherein the filter element is a filter element of the type described in claim 19, wherein the filter element is a filter element having a first filter element and a second filter element.

[0006] The composite filter element according to the present invention has a simple and compact structure, can reduce the occupied space, is conducive to reasonable layout, can reduce the difficulty of disassembly and assembly, saves repair and maintenance costs, and has good filtering effect and is not prone to water leakage.

[0007] In addition, the composite filter element according to the present invention may also have the following additional technical features:

[0008] According to some embodiments of the present invention, the slide groove is provided on the top cover, and the matching portion is provided on the filter cartridge.

[0009] Optionally, in the axial direction of the filter cartridge, the height of the slide groove is greater than the thickness of the matching portion, and the difference between the height of the slide groove and the thickness of the matching portion is greater than or equal to 0.5 mm.

[0010] Optionally, the mating portion is provided on the filter cartridge and extends toward the central axis of the filter cartridge, a support section is provided on the surface of the top cover, a hanging section extending away from the central axis of the filter cartridge is connected to the support section, and the support section and the hanging section together constitute the slide groove.

[0011] Further, the fitting portion extends radially toward the central axis of the filter cartridge, the supporting section extends axially away from the top cover of the filter cartridge, and the hanging section extends radially outwardly of the filter cartridge.

[0012] Advantageously, a limiting portion is provided on the top cover at the front end of the sliding direction of the matching portion.

[0013] Optionally, the limiting portion is formed as a limiting plate and is respectively connected to the supporting section, the hanging section and the top cover.

[0014] Optionally, the matching portion is provided with at least one process hole penetrating the matching portion along the axial direction of the filter cartridge.

[0015] Optionally, the hanging section is constructed as a fan-shaped ring extending along the circumference of the top cover, and the central angle corresponding to the hanging section is greater than or equal to 15°.

[0016] Optionally, the slide grooves are multiple and spaced apart along the circumference of the top cover, and the matching parts are multiple and correspond one-to-one to the slide grooves.

[0017] According to some embodiments of the present invention, a plurality of the slide grooves are evenly spaced apart along the circumference of the filter cartridge, and a plurality of the matching portions are evenly spaced apart along the circumference of the filter cartridge.

[0018] According to some embodiments of the present invention, a water pipe is provided on the top cover.

[0019] According to some embodiments of the present invention, a top cover supporting structure is provided on the outer peripheral surface of the top cover to form a top cover water passage between the top cover and the filter cartridge.

[0020] Optionally, an extension height of the top cover support structure along the radial direction of the top cover is greater than or equal to 0.5 mm.

[0021] Optionally, the support structure is constructed as a plurality of top cover support ribs spaced apart along the circumference of the top cover, and each of the top cover support ribs extends along the axial direction of the filter cartridge.

[0022] Optionally, each of the top cover support ribs abuts against the inner wall surface of the filter cartridge.

[0023] The water treatment equipment according to the present invention comprises a waterway plate and a filter element, wherein the waterway plate is provided with a filter element connecting seat; the filter element is the above-mentioned composite filter element, and the composite filter element is detachably connected to the filter element connecting seat.

[0024] According to the water treatment equipment of the present invention, by providing the above-mentioned composite filter element, the filtering effect can be improved, the volume can be reduced, and more installation requirements can be met.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 is a perspective view of a filter element assembly according to an embodiment of the present invention;

[0028] Figure 2 is an exploded view of a filter element assembly according to an embodiment of the present invention;

[0029] Figure 3 is a front view of a filter element assembly according to an embodiment of the present invention;

[0030] Figure 4 is a cross-sectional view of a filter element assembly according to one embodiment of the present invention;

[0031] Figure 5 yes Figure 4 The enlarged view of the part A shown in the middle circle;

[0032] Figure 6 A cross-sectional view of a composite filter element according to an embodiment of the present invention;

[0033] Figure 7 yes Figure 6 The enlarged view of B shown in the middle circle;

[0034] Figure 8 yes Figure 6 The enlarged view of C shown in the middle circle;

[0035] Fig. 9 yes Figure 6 The enlarged view of D shown in the middle circle;

[0036] Fig.10 is a three-dimensional diagram of a waterway plate according to an embodiment of the present invention;

[0037] Fig.11 yes Fig.10 A side view of the waterway plate in FIG.

[0038] Fig.12 yes Fig.10 A bottom view of the waterway plate in FIG.

[0039] Fig.13 yes Fig.10 A cross-sectional view of the waterway plate in FIG.

[0040] Fig.14 is a three-dimensional diagram of a filter housing in a composite filter element according to an embodiment of the present invention;

[0041] Fig.15 yes Fig.14 Bottom view of the filter housing in FIG.

[0042] Fig.16 yes Fig.14 A side view of the filter housing in FIG.

[0043] Fig.17 is along Fig.16 Sectional view along line EE;

[0044] Fig.18 yes Fig.17 The enlarged view of the F part circled in the middle;

[0045] Fig.19 is a three-dimensional diagram of a first filter cartridge in a composite filter element according to an embodiment of the present invention;

[0046] Fig. 20 yes Fig.19 A top view of the first filter cartridge in FIG.

[0047] Fig.21 is a side view of a first filter cartridge in a composite filter element;

[0048] Fig. 22 is along Fig.21 Sectional view of the mid-GG line;

[0049] Fig.23 is a three-dimensional diagram of a top cover in a composite filter element according to an embodiment of the present invention;

[0050] Fig.24 yes Fig.23 A top view of the top cover in FIG.

[0051] Fig.25 yes Fig.23 A side view of the top cover in;

[0052] Fig.26 is a perspective view of a second filter cartridge in a composite filter element according to some embodiments of the present invention;

[0053] Fig. 27 yes Fig.26 A side view of a second filter cartridge in FIG.

[0054] Fig.28 yes Fig.26 A top view of the second filter element in FIG.

[0055] Fig.29 To the edge Fig.28 Sectional view along the midline HH;

[0056] Fig.30 yes Fig.29 An enlarged view of the circled portion I;

[0057] Fig.31 is a cross-sectional view of a second filter cartridge in a composite filter element according to other embodiments of the present invention;

[0058] Fig.32 is a three-dimensional diagram of a bottom cover in a composite filter element according to an embodiment of the present invention;

[0059] Fig.33 yes Fig.32 A side view of the bottom cover in FIG.

[0060] Fig.34 yes Fig.32 A top view of the bottom cover in FIG.

[0061] Fig.35 is along Fig.34 Sectional view along the mid-JJ line;

[0062] Fig.36 is a three-dimensional diagram of a middle partition of a composite filter element according to an embodiment of the present invention;

[0063] Fig.37 yes Fig.36 A side view of the middle partition in FIG.

[0064] Fig.38 It is a top view of the middle partition of the composite filter element;

[0065] Fig.39 is along Fig.38 Sectional view of the KK line;

[0066] Fig.40 is a perspective view of a central tube of a composite filter element according to an embodiment of the present invention;

[0067] Fig.41 yes Fig.40 A side view of the central tube in FIG.

[0068] Fig.42 It is a top view of the center tube of the composite filter element;

[0069] Fig.43 is along Fig.42 Sectional view of the mid-LL line;

[0070] Fig.44is a perspective view of a central tube in a composite filter element according to some embodiments of the present invention;

[0071] Fig.45 yes Fig.44 A cross-sectional view of the center tube in FIG.

[0072] Fig.46 is a perspective view of a central tube in a composite filter element according to some embodiments of the present invention;

[0073] Fig.47 yes Fig.46 A cross-sectional view of the center tube in FIG.

[0074] Fig.48 is a perspective view of a central tube in a composite filter element according to some embodiments of the present invention;

[0075] Fig.49 yes Fig.48 A cross-sectional view of the center tube in FIG.

[0076] Fig.50 is a perspective view of a central tube in a composite filter element according to some embodiments of the present invention;

[0077] Fig.51 yes Fig.50 A cross-sectional view of the center tube in FIG.

[0078] Fig.52 is a perspective view of a first filter cartridge of a composite filter element according to an embodiment of the present invention;

[0079] Fig.53 yes Fig.52 A front view of the first filter cartridge in FIG.

[0080] Fig.54 yes Fig.52 A top view of the first filter cartridge in FIG.

[0081] Fig.55 is a perspective view of a first filter cartridge of a composite filter element according to an embodiment of the present invention;

[0082] Fig.56 yes Fig.55 A front view of the first filter cartridge in FIG.

[0083] Fig.57 yes Fig.55 A top view of the first filter cartridge in FIG.

[0084] Fig.58 is a perspective view of a filter assembly according to some embodiments of the present invention;

[0085] Fig.59 is a perspective side view of a filter assembly according to some embodiments of the present invention;

[0086] Fig.60 yes Fig.59 A cross-sectional view of a filter assembly in FIG.

[0087] Fig.61 yes Fig.59 An exploded view of the filter components in ;

[0088] Fig.62 is a cross-sectional view of a partial structure of a composite filter element according to an embodiment of the present invention, wherein the first filter cartridge and the middle septum are integrally formed;

[0089] Fig.63 is a cross-sectional view of a composite filter element according to some embodiments of the present invention, wherein the first filter cartridge and the middle septum are integrally formed;

[0090] Fig.64 yes Fig.63 A cross-sectional view of the top cover, wherein the first filter cartridge is plugged into and fitted at the arrow;

[0091] Fig.65 is a cross-sectional view of a portion of the structure of a composite filter element according to some embodiments of the present invention, wherein the central tube and the middle partition plate are integrally formed;

[0092] Fig.66 It is a cross-sectional view of a part of the structure of a composite filter element according to some embodiments of the present invention, wherein the center tube and the top cover are integrally formed.

[0093] Reference numerals:

[0094] 1000: filter element assembly;

[0095] 100: composite filter element; 200: second filter element;

[0096] 1: filter housing; 10: installation cavity; 10a: water gap; 10a1: first water gap; 10a2: second water gap;

[0097] 11: shell body; 111: shell body; 112: shell bottom; 12: connecting ribs; 121: first connecting ribs; 122: second connecting ribs;

[0098] 2: Filter cartridge:

[0099] 21: first filter cartridge; 210: first filter chamber; 211: cartridge body; 212: connecting portion; 213: mounting portion; 214: supporting member; 215: matching portion; 2151: process hole;

[0100] 2131: sealed container; 214a: support ribs; 214b: support platform assembly; 2141: sub-support platform;

[0101] 22: second filter cartridge; 220: second filter cavity; 221: first cylinder; 2210: first cylinder cavity; 222: second cylinder; 2220: second cylinder cavity; 223: connecting cylinder; 2230: connecting cylinder cavity; 224: ribs; 2241: rib body; 2242: rib connection part;

[0102] 3: middle partition plate; 30: partition plate water hole; 31: partition plate body; 32: partition plate connecting part; 321: sealing groove; 33: annular sealing member; 311: positioning support platform; 312: positioning rib;

[0103] 4: first filter element; 40: filter channel;

[0104] 5: second filter element; 51: first filter material; 52: second filter material; 53: isolation plate;

[0105] 510: first filter material water channel; 520: second filter material water channel;

[0106] 6: center tube; 60a: first tube water passage; 60b: second tube water passage;

[0107] 61: pipe body; 611: receiving groove; 62: blocking piece; 621: blocking body; 622: guide part;

[0108] 7: top cover; 70: top cover water flow channel 70; 71: water pipe; 72: slide; 73: limit part; 74: top cover support rib;

[0109] 721: first extension section; 7211: supporting step; 722: second extension section;

[0110] 8: bottom cover; 80: bottom cover water hole; 81: bottom cover body; 82: cover connecting part;

[0111] 821: first connection portion; 822: second connection portion; 823: mounting groove;

[0112] 300: water channel plate; 301: plate body; 302: water channel; 3011: first connecting seat; 3012: second connecting seat; 3013: annular sealing rib; 3011a: first water through hole; 3012a: second water through hole. DETAILED DESCRIPTION

[0113] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0114] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0115] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0116] The following is a detailed description of a filter element assembly 1000 according to an embodiment of the present invention in conjunction with the accompanying drawings. The filter element assembly 1000 can be used in water treatment equipment such as a water purifier, a water dispenser, and a water purifier, but is not limited thereto. In this application, for the sake of ease of description and understanding, the up-down direction, the left-right direction, and the front-back direction are respectively described by taking the up-down direction, the left-right direction, and the front-back direction shown in the figure as examples.

[0117] like Figure 1-Figure 5 As shown, a filter element assembly 1000 according to an embodiment of the present invention includes a waterway plate 300, a first filter element (for example, the composite filter element 100 shown in the figure) and a second filter element 200. The first filter element and the second filter element 200 can filter the water flowing through to output filtered clean water to improve the water quality.

[0118] A first connecting seat 3011 and a second connecting seat 3012 are provided on the waterway plate 300. The first filter element can be detachably installed on the first connecting seat 3011, and the second filter element 200 can be detachably installed on the second connecting seat 3012. The structure is simple and compact, and the filter element and the second filter element 200 can be easily removed from the waterway plate 300 for replacement and maintenance. The difficulty of disassembly and assembly is low, and the repair and maintenance cost is low.

[0119] At least one of the first filter element and the second filter element 200 is a composite filter element, and the composite filter element may be a composite filter element 100 according to an embodiment of the present invention. The so-called composite filter element refers to a filter structure that integrates multiple ordinary filter elements, and can realize a filter element with multiple filtering functions. In other words, the first filter element may be a composite filter element 100 that integrates multiple ordinary filter elements, or the second filter element may be a composite filter element 100 that integrates multiple ordinary filter elements, or the first filter element and the second filter element 200 may be respectively set as composite filter elements 100 that integrate multiple ordinary filter elements at the same time.

[0120] In this way, the filtering function of the filter element assembly 1000 can be expanded, the filtering volume of the filtering assembly can be increased, the filtering efficiency can be improved, and the structure is compact, occupies little space, is conducive to space layout, and can meet more installation requirements.

[0121] The waterway plate 300 of the filter element assembly 1000 will be described first.

[0122] like Figure 10-13 As shown, the waterway plate 300 for the filter element assembly 1000 according to an embodiment of the present invention includes an integrally formed plate body 301, on which a first connecting seat 3011 suitable for connecting to the first filter element and a second connecting seat 3012 suitable for connecting to the second filter element 200 are provided.

[0123] The first connection seat 3011 is spaced apart from the second connection seat 3012 to reserve installation space for the first filter element and the second filter element 200 to avoid interference. The second connection seat 3012 and the second connection seat 3012 are arranged on the same side of the thickness direction of the plate body 301, and the first filter element and the second filter element 200 can be installed on the same side of the plate body 301. For example, in the illustrated example, the waterway plate 300 is arranged horizontally, and the first connection seat 3011 and the second connection seat 3012 are arranged on the lower side of the plate body 301, so that the first filter element and the second filter element 200 can be installed side by side on the lower side of the plate body 301, which has a compact structure, is convenient for replacing the first filter element and the second filter element 200, and is conducive to reducing the height dimension of the filter element assembly 1000.

[0124] The plate body 301 has at least three water channels 302, each of which has a water port suitable for connecting a pipeline. The at least three water channels 302 are respectively connected to one of the first filter element and the second filter element 200, and are used to input water to be filtered into the first filter element and the second filter element 200, and output the purified water filtered by the first filter element and the second filter element 200. Among them, at least three water channels 302 extend toward the same side of the waterway plate 300, that is, at least three water channels 302 are arranged in parallel. Therefore, the external pipeline can connect multiple water channels 302 on the same side of the plate body 301, which is convenient and efficient, and the water channels 302 extending toward the same side of the waterway plate 300 can simplify the structure and optimize the appearance.

[0125] For example, in Fig.10 In the example shown in and , the plate body 301 has four water channels 302, each of which has a water outlet, and the four water channels 302 extend toward the left side of the waterway plate 300. Of course, the water channels 302 can also have other numbers, for example, five, six, etc., and at least three water channels 302 can include a raw water channel, a clean water channel, and a waste water channel, etc. It should be noted that the number of water channels 302 is related to the type and connection method of the first filter element and the second filter element 200, which is understandable to those skilled in the art and will not be repeated here.

[0126] According to some embodiments of the present invention, Figure 10-13 As shown, the first connection seat 3011 and the second connection seat 3012 can be arranged at intervals along the length direction of the plate body 301, the first filter element is a composite filter element 100, at least three water channels 302 can extend along the length direction of the plate body 301, and a water outlet is provided at one end of each water channel 302 close to the composite filter element 100. For example, the length direction of the plate body 301 is the left-right direction shown in the figure, the first connection seat 3011 and the second connection seat 3012 are arranged at intervals along the left-right direction, the first connection seat 3011 is located on the left side of the second connection seat 3012, the composite filter element 100 is connected to the first connection seat 3011 and is located on the left side of the second filter element 200, at least three water channels 302 extend toward the composite filter element 100 to the left side of the plate body 301, each water channel 302 is provided with a water outlet at the left end, and the external pipelines are respectively connected to the water outlets. In this way, the water inlet can be arranged on the same side of the waterway plate 300, and the water inlet can be arranged adjacent to the composite filter element 100, which is convenient for connection with the external road, and the internal waterway 302 of the plate body 301 is simple, and the structural design is simpler.

[0127] In some embodiments, at least three water channels 302 may be arranged along the width direction of the plate body 301. Fig.10 In the example shown, the water channel 302 is arranged in the front-to-back direction, has a compact structure, is easy to connect to external pipelines, and has better aesthetics.

[0128] Optionally, the diameter D of each nozzle can satisfy: 5mm≤D≤30mm, that is, the diameter D of each nozzle can be any value between 5mm-30mm. For example, the diameter of each nozzle can be 5mm, 10mm, 25mm or 30mm, etc. The diameters of multiple nozzles can be the same to connect external pipelines of the same diameter, or the diameters of multiple nozzles can be different to meet the water inlet and outlet requirements of different nozzles.

[0129] The first filter element and the first connecting seat 3011 as well as the second filter element 200 and the second connecting seat 3012 can be detachably connected by means of structures such as threads or snaps.

[0130] For example, in some embodiments, Fig.10 , Fig.11 and Fig.13 As shown, a first annular flange and a second annular flange spaced apart from the first annular flange may be provided on the plate body 301, the first annular flange and the second annular flange are respectively formed as a first connecting seat 3011 and a second connecting seat 3012, and the first filter element and the second filter element 200 are respectively connected to the first annular flange and the second annular flange.

[0131] Optionally, the outer circumferential surface of the first annular flange may be provided with a first external thread suitable for threaded connection with the first filter element, and the outer circumferential surface of the second annular flange may be provided with a second external thread suitable for threaded connection with the second filter element 200. Thus, the first filter element is threadedly connected to the first annular flange, and the second filter element 200 is threadedly connected to the second annular flange.

[0132] In other embodiments, a first annular groove (not shown in the figure) and a second annular groove (not shown in the figure) spaced apart from the first annular groove are provided on the plate body 301. The first annular groove and the second annular groove are respectively formed as a first connecting seat 3011 and a second connecting seat 3012. The first annular groove is connected to the first filter element, and the second annular groove is connected to the second filter element 200.

[0133] Optionally, the inner surface of the first annular groove may be provided with a first internal thread suitable for threaded connection with the first filter element, and the inner surface of the second annular groove may be provided with a second internal thread suitable for threaded connection with the second filter element 200. Thus, the first filter element is threadedly matched with the first annular groove, and the second filter element 200 is threadedly connected to the second annular groove.

[0134] Therefore, the waterway plate 300 has a simple structure and is easy to process, and the first filter element and the second filter element 200 are connected to the plate body 301 through threaded cooperation, which is convenient and labor-saving to disassemble and assemble, and is conducive to controlling repair and maintenance costs.

[0135] According to some embodiments of the present invention, Fig.12 and Fig.13As shown, at least two annular sealing ribs 3013 may be provided in each of the first connection seat 3011 and the second connection seat 3012. The annular sealing ribs 3013 in the first connection seat 3011 are suitable for sealingly connecting the first filter element, and the annular sealing ribs 3013 in the second connection seat 3012 are suitable for sealingly connecting the second filter element 200, so as to ensure that the water channels 302 do not cross each other. In the first connection seat 3011, at least one first water hole 3011a is provided between two adjacent annular sealing ribs 3013 to connect the water channel 302 and the first filter element, and input the water to be filtered into the first filter element; in the second connection seat 3012, at least one second water hole 3012a is provided between two adjacent annular sealing ribs 3013 to connect the water channel 302 and the second filter element 200, and input the water to be filtered into the second filter element 200, and output the purified water after filtering.

[0136] Optionally, at least two annular sealing ribs 3013 are arranged concentrically in the first connection seat 3011, and at least two annular sealing ribs 3013 are arranged concentrically in the second connection seat 3012. Thus, the structure is compact, the layout is reasonable, and the sealing performance can be optimized and the reliability can be improved.

[0137] For example, in Fig.13 In the example shown, three concentrically arranged annular sealing ribs 3013 are provided in the first connecting seat 3011, wherein the innermost annular sealing rib 3013 surrounds a first water hole 3011a, a first water hole 3011a is provided between two adjacent annular sealing ribs 3013, and a first water hole 3011a is provided between the outermost annular sealing rib 3013 and the inner wall surface of the first connecting seat 3011; similarly, three annular sealing ribs 3013 are provided in the second connecting seat 3012, the innermost annular sealing rib 3013 surrounds a second water hole 3012a, a second water hole 3012a is provided between two adjacent annular sealing ribs 3013, and a second water hole 3012a is provided between the outermost annular sealing rib 3013 and the inner wall surface of the second connecting seat 3012.

[0138] In short, the waterway plate 300 used for the filter element assembly 1000 according to the embodiment of the present invention has a simple and compact structure, good aesthetics, and occupies a small space, which is conducive to reasonable layout, and is convenient and labor-saving to disassemble and assemble, and can meet more installation requirements.

[0139] The structure of the composite filter element 100 in the filter element assembly 1000 is described in detail below.

[0140] Combination Figure 4 and Figure 6As shown, the composite filter element 100 according to an embodiment of the present invention includes: a filter housing 1 and a filter cartridge 2, wherein the filter housing 1 defines an installation cavity 10, the filter cartridge 2 is disposed in the installation cavity 10, and the filter cartridge 2 can form a first filter channel and a second filter channel isolated from each other with the filter housing 1, wherein the filter cartridge 2 is provided with a first filter element 4 for filtering the fluid flowing in the first filter channel, and a second filter element 5 for filtering the fluid in the second filter channel, and the second filter element 5 includes at least two levels of filter materials.

[0141] That is, the composite filter element 100 is provided with a first filter channel and a second filter channel that are not connected to each other, the fluid in the first filter channel can be filtered through the first filter element 4, and the fluid in the second filter channel can be filtered through the second filter element 5, and the filtering process in the first filter channel and the filtering process in the second filter channel are independent of each other and do not affect each other. Among them, the second filter element 5 includes two or more levels of filter materials.

[0142] For example, in Figure 4 and Figure 6 In the example shown, the second filter element 5 includes a first-stage filter material 51 and a second-stage filter material 52, and the first-stage filter material 51 and the second-stage filter material 52 are arranged along the flow direction of the water flow to perform two-stage filtration on the fluid in the second filter flow channel. Of course, the present invention is not limited to this, and the second filter element 5 may include three or more levels of filter materials, for example, four levels, five levels, etc.

[0143] By utilizing the filter cartridge 2 and the filter housing 1 to form a first filter channel and a second filter channel that are isolated from each other, two independent filtering processes can be performed simultaneously in the composite filter element 100. Moreover, the second filter element 5 is configured to include at least two levels of filter materials, which not only has a simple and compact structure and reduces the occupied space, but also can improve the filtering effect.

[0144] like Figure 1-Figure 5 In one embodiment shown, the composite filter element 100 includes: a waterway plate 300 , a filter housing 1 , a filter cartridge 2 , a middle partition plate 3 , a first filter element 4 , a second filter element 5 and a central tube 6 .

[0145] A filter element connecting seat (for example, the first connecting seat 3011 shown in the figure) is provided on the waterway plate 300, and the filter housing 1 is connected to the mounting seat to achieve fixation. An installation cavity 10 is defined in the filter housing 1, and the filter cartridge 2, the first filter element 4, the second filter element 5, etc. can be installed in the installation cavity 10.

[0146] The filter cartridge 2 is installed in the installation cavity 10, and a filter cavity is defined in the filter cartridge 2. The outer wall surface of the filter cartridge 2 is spaced apart from the inner wall surface of the filter housing 1 to form a water-passing gap 10a. The middle partition plate 3 is arranged in the filter cartridge 2, and the middle partition plate 3 is sealedly connected to the filter cartridge 2 to divide the filter cavity into a first filter cavity 210 adjacent to the waterway plate 300 and a second filter cavity 220 away from the waterway plate 300. Figure 4 , Figure 5 and Figure 6 As shown, the middle partition plate 3 is provided with a partition plate water hole 30 connecting the first filter cavity 210 and the second filter cavity 220 .

[0147] like Figure 4 and Figure 5 As shown, the first filter element 4 is installed in the first filter cavity 210, and a filter channel 40 is formed in the first filter element 4. The second filter element 5 is installed in the second filter cavity 220. The first filter element 4 and the second filter element 5 filter the water flowing through, respectively, intercept impurities, microorganisms and bacteria therein, remove odors in the water, and output purified water with improved water quality.

[0148] The central tube 6 may be disposed in the filter channel 40 in the first filter element 4 , and the central tube 6 is connected to the partition plate 3 , a first tube water passage 60 a is formed in the central tube 6 , and a second tube water passage 60 b is formed between the central tube 6 and the first filter element 4 .

[0149] Among them, the water gap 10a, the second filter cavity 220 and the first tube water channel 60a are connected to form a first filter channel, the first filter cavity 210 is connected to the second tube water channel 60b to form a second filter channel, and the first filter channel and the second filter channel are isolated from each other, that is, the first filter channel and the second filter channel are not connected and are independent of each other.

[0150] It can be understood that the first filter element 4 is arranged in the first filter channel to filter the water flowing through the first filter channel, and the second filter element 5 is arranged in the second filter channel to filter the water flowing through the second filter channel. The two filtering processes are performed independently and do not affect each other.

[0151] In this way, the filtration process in the first filter channel and the filtration process in the second filter channel can be carried out simultaneously. When the first filter element 4 and the second filter element 5 are the same type of filter elements, the filtration amount can be effectively increased and the filtration efficiency of the composite filter element 100 can be improved; and when the first filter element 4 and the second filter element 5 are different types of filter elements, filtration processes with different filtration functions can be carried out simultaneously in the first filter channel and the second filter channel.

[0152] Therefore, the user can choose to filter water through one or both of the first filter channel and the second filter channel as needed. It has good adaptability and can meet a variety of different needs. Moreover, the integrated setting makes the structure simple and compact, occupies little space, and is conducive to spatial layout.

[0153] Let's first combine Figure 14-18 The filter housing 1 of the composite filter element 100 according to the embodiment of the present invention is described.

[0154] The filter housing 1 is detachably connected to the filter element connection seat. In the example shown in the figure, the filter housing 1 is connected to the first connection seat 3011. The inner circumferential surface of the filter housing 1 is provided with an internal thread, and the filter element connection seat is provided with an adapted external thread. In this way, when the filter material in the composite filter element 100 expires or is damaged, the filter housing 1 can be removed and the internal filter material can be replaced. The filter housing 1 can be retained and reused, which is environmentally friendly and can effectively reduce costs.

[0155] According to some embodiments of the present invention, the filter housing 1 of the composite filter element 100 includes a housing body 11 and a connecting rib 12, wherein the housing body 11 defines an installation cavity 10 with an open top. Figure 16-Figure 18 As shown, the shell body 11 includes a shell body 111 and a shell bottom 112 disposed at the bottom of the shell body 111 , and the connecting rib 12 can be integrally disposed on the shell bottom 112 , and the connecting rib 12 can be connected to the shell body 111 .

[0156] Therefore, the strength of the filter housing 1 can be effectively improved, the probability of damage to the filter housing 1 can be reduced, and the service life can be extended.

[0157] According to some embodiments of the present invention, Figure 14-18 As shown, the connecting rib 12 may include: a first connecting rib 121, which may be arranged on a side surface of the housing away from the housing body 111, and the first connecting rib 121 may extend radially along the housing bottom 112, that is, the first connecting rib 121 is arranged on the outer surface of the housing bottom 112, and the first connecting rib 121 is radially connected to the housing body 111. Thus, the strength of the housing bottom 112 and the connection between the housing bottom 112 and the housing body 111 can be optimized. In addition, the arrangement of the first connecting rib 121 facilitates the holding operation of the filter housing 1, and the disassembly and assembly is more convenient and labor-saving.

[0158] In some embodiments, Fig.15 As shown, the two ends of the first connecting rib 121 can be respectively connected to the two radially opposite side walls of the shell body 111. In other words, the first connecting rib 121 is radially connected to the two side walls of the shell body 111, that is, the first connecting rib 121 is arranged on the bottom surface of the shell bottom 112 and the two ends are respectively connected to the two radially opposite sides of the shell body 111, which has a simple structure and reliable connection.

[0159] In other embodiments, the first connecting ribs 121 are multiple and arranged around the central axis of the shell bottom 112. Fig.15 In the example shown, there are three first connection ribs 121 , and the three first connection ribs 121 are radially spaced apart, thereby optimizing the connection strength and improving the reliability.

[0160] Optionally, one ends of the plurality of first connecting ribs 121 are connected, and the other ends of the plurality of first connecting ribs 121 are connected to the shell body 111 , that is, the first connecting ribs 121 are disposed on the shell bottom 112 and radially connected to the shell body 111 .

[0161] Advantageously, the plurality of first connecting ribs 121 may be evenly spaced and distributed along the circumference of the housing bottom 112. Thus, the reliability of the filter housing 1 is further improved, and the appearance of the filter housing 1 is more neat and beautiful.

[0162] like Figure 16-Figure 18 As shown, the shell body 111 is smoothly connected to the shell bottom 112, and the first connecting rib 121 is smoothly connected to the shell body 111, thereby reducing stress concentration and further improving the connection strength.

[0163] According to some embodiments of the present invention, the connecting ribs 12 include: at least two second connecting ribs 122, at least two second connecting ribs 122 can be arranged at intervals on the surface of the shell bottom 112 facing the shell body 111, and at least two second connecting ribs 122 extend along the radial direction of the shell bottom 112. That is, at least two second connecting ribs 122 are arranged on the inner surface of the shell bottom 112, and at least two second connecting ribs 122 extend along the radial direction of the shell bottom 112, and at least two connecting ribs 12 are arranged at intervals.

[0164] In this way, the strength of the shell bottom 112 can be strengthened from the inside, the filter shell 1 can be prevented from being damaged, and the service life of the filter shell 1 can be extended. In addition, the second connecting ribs 122 arranged at intervals can facilitate the formation of a water gap 10a between the second connecting ribs 122, the shell bottom 112 and the filter cartridge 2, which is beneficial to the arrangement of the flow channel.

[0165] Alternatively, if Fig.18 As shown, each second connecting rib 122 can be formed into an L-shape, and the filter cartridge 2 can be supported on the L-shaped second connecting rib 122. The outer peripheral surface and the bottom surface of the filter cartridge 2 are respectively stopped on the second connecting rib 122, which has good stability, can prevent the filter cartridge 2 from being misplaced, and the sealing reliability is also improved.

[0166] Advantageously, there are multiple second connecting ribs 122 , and the multiple second connecting ribs 122 are evenly distributed along the circumference of the shell bottom 112 , thereby further improving stability and reliability.

[0167] like Fig.17 and Fig.18 As shown, the inner ends of the plurality of second connecting ribs 122 are arranged at intervals, which can reduce the water flow resistance in the water flow gap 10a and optimize the structural layout.

[0168] Optionally, the filter housing 1 can be an integrally formed injection molded part. In other words, the housing body 111, the housing bottom 112 and the connecting ribs 12 can be integrally formed by injection molding. Thus, the processing is convenient, the assembly process can be omitted, the assembly accuracy is improved, and the cost is controlled.

[0169] A filter cartridge 2 is installed in the installation cavity 10 of the filter housing 1, a filter cavity is defined in the filter cartridge 2, the outer wall surface of the filter cartridge 2 is spaced apart from the inner wall surface of the filter housing 1 to form a water-passing gap 10a, a partition plate 3 is provided in the filter cartridge 2, the partition plate 3 separates the filter cavity into a first filter cavity 210 adjacent to the waterway plate 300 and a second filter cavity 220 away from the waterway plate 300.

[0170] In some embodiments of the present invention, Figure 4 and Figure 6 As shown, the filter cartridge 2 includes a first filter cartridge 21 and a second filter cartridge 22. The first filter cartridge 21 is disposed in the mounting cavity 10, and the first filter cartridge 21 is mounted on the filter element connecting seat (i.e., the first connecting seat 3011 shown in the figure), a first filter cavity 210 is defined in the first filter cartridge 21, the first filter element 4 is mounted in the first filter cavity 210, the outer peripheral surface of the first filter cartridge 21 is spaced apart from the inner peripheral surface of the filter housing 1 to form a first water-passing gap 10a1, and the second filter cartridge 22 is disposed in the mounting cavity 10, and optionally, the central axis of the first filter cartridge 21 coincides with the central axis of the second filter cartridge 22, that is, the second filter cartridge 22 is located at one axial end of the first filter cartridge 21 (e.g., the lower end shown in the figure), and the structure is more compact. A second filter chamber 220 is defined in the second filter cartridge 22, and the second filter element 5 is installed in the second filter chamber 220. The outer wall surface of the second filter chamber 220 is separated from the inner wall surface of the filter housing 1 to form a second water flow gap 10a2 connected to the first water flow gap 10a1. The first water flow gap 10a1 and the second water flow gap 10a2 together constitute the above-mentioned water flow gap 10a.

[0171] Combine the following Figure 19-22 The structure of the first filter cartridge 21 is described in detail.

[0172] According to some embodiments of the present invention, Fig.19 and Fig.21 As shown, the first filter cartridge 21 includes: a cartridge body 211 , a mounting portion 213 and a plurality of support members 214 .

[0173] A first filter cavity 210 may be formed in the barrel body 211, and the mounting portion 213 may be connected to one axial end of the barrel body 211 through the connecting portion 212, and the mounting portion 213 is installed on the filter element connecting seat (i.e., the first connecting seat 3011 shown in the figure). For example, the mounting portion 213 may extend into the filter element connecting seat and cooperate with the annular sealing rib 3013, and the mounting portion 213 is connected to the first filter cavity 210 to allow water to flow in the mounting portion 213 and the barrel body 211.

[0174] like Figure 19-21As shown, a plurality of support members 214 may be provided on the outer circumferential surface of the barrel body 211, and the plurality of support members 214 may be arranged at intervals along the circumferential direction of the barrel body 211, and each support member 214 may extend radially outwardly along the barrel body 211. In other words, a plurality of support members 214 arranged at intervals along the circumferential direction are provided on the outer circumferential surface of the barrel body 211, and the plurality of support members 214 extend away from the central axis of the barrel body 211 respectively.

[0175] A plurality of support members 214 can stop at the inner circumferential surface of the filter housing 1, thereby forming a first water flow gap 10a1 between the inner circumferential surface of the filter housing 1, the outer circumferential surface of the cartridge body 211 and two adjacent support members 214, which can not only improve the strength of the first filter cartridge 21 and avoid damage to the first filter cartridge 21, but also help to ensure the concentricity of the first filter cartridge 21 and the filter housing 1, and ensure smooth water flow, stable and reliable sealing, and not easy to leak.

[0176] Alternatively, if Fig.21 As shown, the central axis of the mounting portion 213 may coincide with the central axis of the barrel body 211 , that is, the mounting portion 213 is disposed at one axial end of the barrel body 211 .

[0177] like Fig.21 and Fig. 22 As shown, the connecting portion 212 can extend along the circumference and radial direction of the barrel body 211, the outer end of the connecting portion 212 can be connected to the barrel body 211, and the inner end of the connecting portion 212 can be connected to the mounting portion 213. Thus, the barrel body and the mounting portion 213 can be connected through the connecting portion 212, and the structure is simple and compact.

[0178] In some embodiments, the plurality of support members 214 may include: a plurality of support ribs 214a, the plurality of support ribs 214a may be arranged at intervals along the circumference of the cartridge body 211 on the outer circumferential surface of the cartridge body 211, and each support rib 214a may extend along the axial direction of the cartridge body 211. Thus, a first water-passing gap 10a1 extending along the axial direction of the cartridge body 211 may be formed between the outer circumferential surface of the cartridge body 211 and the inner circumferential surface of the filter housing 1, which has good reliability and can effectively improve the concentricity of the first filter cartridge 21 and the filter housing 1.

[0179] Alternatively, if Fig. 20 As shown, a plurality of support ribs 214a can be evenly spaced along the circumference of the cartridge body 211, so that the first water gap 10a1 can be evenly arranged on the outer circumference of the cartridge body 211, with small water resistance and good filtering effect, and the appearance of the first filter cartridge 21 can be made neat and beautiful, thereby improving strength.

[0180] Alternatively, if Fig.19 and Fig.21As shown, each support rib 214a can extend from one axial end face of the cartridge body 211 to the other axial end face of the cartridge body 211. In the illustrated example, the central axis of the first filter cartridge 21 is oriented in the up-down direction, and each support rib 214a extends from the lower end face of the cartridge body 211 to the upper end face of the cartridge body 211. The structure is simple, the processing is convenient, and it is conducive to controlling the cost.

[0181] In some other embodiments, the plurality of support members 214 may include: at least one support platform group 214b, each support platform group 214b including a plurality of sub-support platforms 2141, the plurality of sub-support platforms 2141 in each support platform group 214b are disposed on the outer peripheral surface of the barrel body 211 and arranged along the circumference of the barrel body 211, and each sub-support platform 2141 may extend along the circumference of the barrel body 211. For example, in Fig.21 In the example shown, the plurality of support members 214 include a group of support platforms 214b, and the group of support platforms 214b includes six sub-support platforms 2141, which are arranged on the outer circumferential surface of the barrel body 211 and arranged along the circumferential direction of the barrel body 211, and each sub-support platform 2141 extends along the circumferential direction of the barrel body 211. Thus, the outer end of each sub-support platform 2141 can stop against the inner circumferential surface of the filter housing 1, and a water gap 10a through which water can flow is formed between the outer circumferential surface of the barrel body 211 and the inner circumferential surface of the filter housing 1 through two adjacent sub-support platforms 2141, so that water can flow better.

[0182] Optionally, there can be multiple groups of support platform groups 214b, and the multiple groups of support platform groups 214b can be arranged at intervals along the axial direction of the barrel body 211, so that they can stop the inner circumferential surface of the filter housing 1 at multiple positions in the axial direction of the barrel body 211, thereby further ensuring the concentricity of the barrel body 211 and the filter housing 1, and improving the assembly stability and sealing reliability.

[0183] Optionally, the cross-section of each sub-support platform 2141 is rectangular, which has high strength and is easy to process and manufacture, thereby facilitating cost control.

[0184] In some other embodiments, Figure 19-21 As shown, the plurality of support members 214 may include: a plurality of support ribs 214a and a plurality of sub-support platforms 2141. The plurality of support ribs 214a are provided on the outer circumferential surface of the barrel body 211 and are spaced apart along the circumferential direction of the barrel body 211, each support rib 214a may extend along the axial direction of the barrel body 211, each sub-support platform 2141 may be provided on the outer circumferential surface of the barrel body 211, and each sub-support platform 2141 extends along the circumferential direction of the barrel body 211, each sub-support platform 2141 may be located between two adjacent support ribs 214a, and each sub-support platform 2141 is spaced apart from two adjacent support ribs 214a.

[0185] In this way, the strength of the cartridge body 211 can be effectively improved, and the probability of damage to the first filter cartridge 21 is further reduced. In addition, multiple support ribs 214a and multiple sub-support platforms 2141 can be used to improve the concentricity between the cartridge body 211 and the filter housing 1, and ensure smooth water flow. In addition, the sealing stability and reliability can be effectively improved.

[0186] According to some embodiments of the present invention, within the cross section of the cartridge body 211, the outer edges of the plurality of support members 214 may be located on the same imaginary circle, so that the plurality of support members 214 abut against the inner circumferential surface of the filter housing 1, thereby ensuring better concentricity between the cartridge body 211 and the filter housing 1.

[0187] Combination Figure 4 good Figure 6 As shown, the mounting portion 213 can be mounted on the filter element connection seat, and one end of the mounting portion 213 away from the barrel body 211 (for example, the upper end shown in the figure) can be provided with a sealing groove 2131 suitable for accommodating a sealing member used to seal the gap between the mounting portion 213 and the filter element connection seat, and the sealing groove 2131 is provided on the outer peripheral surface of the mounting portion 213, and the sealing groove 2131 extends along the circumference of the mounting portion 213 to form a closed ring. In other words, the outer peripheral surface of the mounting portion 213 away from the barrel body 211 is provided with an annular sealing groove 2131, and a sealing member can be installed in the sealing groove 2131, and the sealing member is used to seal the gap between the mounting portion 213 and the filter element connection seat to avoid the occurrence of water cross-talk, which can reduce the probability of water leakage.

[0188] Optionally, there are multiple sealing grooves 2131, and the multiple sealing grooves 2131 are spaced apart in the axial direction. Thus, the mounting portion 213 and the filter element connection seat can be sealed by multiple sealing members, with good sealing performance, greatly reduced water leakage probability, and high reliability.

[0189] According to some embodiments of the present invention, the first filter cartridge 21 is an integrally formed injection molded part. In other words, the cartridge body 211, the mounting portion 213 and the plurality of support members 214 are integrally formed by injection molding. This facilitates processing, omits the assembly process, helps control costs, and improves assembly accuracy, which helps further ensure concentricity.

[0190] In some embodiments, a top cover 7 is installed in the filter cavity of the filter cartridge 2, and the top cover 7 can be used to position the first filter element 4. Figure 4 and Figure 6 In the example shown, the top cover 7 is connected to the first filter cartridge 21. The top cover 7 and its related structures are described in detail below by taking the top cover 7 being connected to the first filter cartridge 21 as an example.

[0191] The top cover 7 is pivotally disposed in the filter cavity, and one of the filter cartridge 2 and the top cover 7 may be provided with a slide groove 72 extending along the circumference of the filter cartridge 2, and the other of the filter cartridge 2 and the top cover 7 may be provided with a matching portion 215 extending along the circumference of the filter cartridge 2, and the matching portion 215 may be slidably matched with the slide groove 72 along the circumference of the filter cartridge 2. That is, when the slide groove 72 is provided on the filter cartridge 2, the matching portion 215 may be provided on the top cover 7, or, the matching portion 215 may be provided on the filter cartridge 2, and the slide groove 72 may be provided on the top cover 7.

[0192] For example, in Figure 4 and Figure 6 In the example shown, the slide groove 72 is provided on the top cover 7, and the matching portion 215 is provided on the first filter cartridge 21. The top cover 7 is installed in the first filter cartridge 21, and then the top cover 7 or the first filter cartridge 21 is rotated to make the matching portion 215 on the first filter cartridge 21 slide into the slide groove 72 and match in the slide groove 72, so that the top cover 7 and the filter cartridge 2 can be quickly assembled. The matching of the top cover 7 and the filter cartridge 2 can be easily disassembled, which is convenient for repair and maintenance. In addition, the slide groove 72 is provided on the top cover 7, which is convenient for processing and production, and is conducive to cost control.

[0193] The other end of the central tube 6 (i.e., the upper end shown in the figure) passes through the top cover 7, and a top water pipe 71 is provided on the top cover 7. The central tube 6 is plugged into the top water pipe 71, and the top water pipe 71 is matched with the annular sealing rib 3013 on the waterway plate 300. The top water pipe 71 is connected with the waterway 302 on the waterway plate 300, and the structure is compact and easy to install. Moreover, the sliding fit method can improve the concentricity of the top cover 7 and the annular sealing rib 3013 on the waterway plate 300, which can prevent serious eccentricity of the top cover 7 during assembly, avoid the deviation of the sealing structure, prevent water from flowing, and prevent the eccentricity of the first filter material 4, which can improve the assembly accuracy, reliability and stability.

[0194] Combination Figure 4 , Figure 6 as well as Figure 23-Figure 25 As shown, the matching portion 215 may be provided on the filter cartridge 2, and the matching portion 215 may extend toward the central axis of the filter cartridge 2, and the chute 72 is provided on the surface of the top cover 7 (i.e., the upper surface shown in the figure), and on a cross section perpendicular to the extension direction of the chute 72, the chute 72 may include: a first extension section 721 and a second extension section 722. Specifically, one end (the lower end shown in the figure) of the first extension section 721 may be connected to the top cover 7, and the other end of the first extension section 721 extends away from the top cover 7, and one end of the second extension section 722 may be connected to the other end of the first extension section 721, and the other end of the second extension section 722 extends away from the central axis of the filter cartridge 2.

[0195] Alternatively, if Figure 4 , Figure 6 , Fig.19 and Fig. 20As shown, the fitting portion 215 can extend radially toward the central axis of the filter cartridge 2 , the other end of the first extension segment 721 can extend circumferentially away from the top cover 7 of the filter cartridge 2 , and the other end of the second extension segment 722 can extend radially outward of the filter cartridge 2 .

[0196] Thus, a slide groove 72 can be set on the surface of the top cover 7, and the slide groove 72 extends in the circumferential direction. The slide groove 72 has a first extension section 721 located on the inner side and a second extension section 722 extending outward away from the first extension section 721. The surface of the top cover 7, the first extension section 721 and the second extension section 722 together constitute the slide groove 72 open on the outside, and the matching portion 215 on the filter cartridge 2 can extend from the outside to the inside. When the top cover 7 and the filter cartridge 2 rotate relative to each other, the matching portion 215 can slide into or out of the slide groove 72 in the circumferential direction. The structure is simple and compact, the design is ingenious, and it is easy to disassemble.

[0197] In some embodiments, Fig.23 and Fig.25 As shown, at the front end of the sliding direction of the fitting part 215, a limiting part 73 is provided on the top cover 7 to limit the fitting part 215 after the fitting part 215 slides into the slide groove 72 and slides into place, which can avoid excessive sliding of the fitting part 215 and improve the matching stability between the fitting part 215 and the slide groove 72, thereby making the matching top frame of the top cover 7 and the filter cartridge 2 more stable and reliable, and the sealing performance is further improved.

[0198] Optionally, the limiting portion 73 may be formed as a limiting plate, and the limiting plate is respectively connected to the first extension section 721, the second extension section 722 and the top cover 7. Thus, a sliding groove 72 which is open radially outward and at the rear side in the sliding direction can be defined between the top cover 7, the first extension section 721, the second extension section 722 and the limiting plate, which is not only simple and compact in structure, but also easy to process, assemble and manufacture.

[0199] According to some embodiments of the present invention, Fig.19 and Fig. 20 As shown, the fitting portion 215 may be provided with at least one process hole 2151 penetrating the fitting portion 215 along the axial direction of the filter cartridge 2, which can save materials, reduce weight, avoid deformation of the fitting portion 215, and improve stability.

[0200] In some embodiments, the slide grooves 72 are multiple and spaced apart along the circumference of the top cover 7. Fig. 20 As shown, the matching portions 215 are multiple and correspond one to one with the slide grooves 72. Fig. 20 As shown, there can be two matching parts 215 and two chute 72. In this way, the top cover 7 and the filter cartridge 2 can realize multiple positioning through the matching combination of multiple chute 72 and matching parts 215, with better stability and better reliability.

[0201] Alternatively, if Fig. 20 As shown, a plurality of chute grooves 72 can be evenly spaced along the circumference of the filter cartridge 2, and a plurality of matching portions 215 can be evenly spaced along the circumference of the filter cartridge 2. Thus, the assembly of the top cover 7 and the filter cartridge 2 can be completed by rotating once, which is convenient to operate, efficient, and has a uniform and stable seal.

[0202] According to some embodiments of the present invention, Fig.23 and Fig.24 As shown, the outer circumferential surface of the top cover 7 may be provided with a plurality of top cover support ribs 74 spaced along the circumference of the top cover 7, and each top cover support rib 74 may extend along the axial direction and radial direction of the filter cartridge 2. Optionally, each top cover support rib 74 stops at the inner wall surface of the filter cartridge 2.

[0203] In this way, the outer circumferential surface of the top cover 7, the inner circumferential surface of the filter cartridge 2 and the two adjacent top cover support ribs 74 can construct a top cover water flow channel 70 that allows water to flow through. The water in the filter chamber can flow from the water flow channel 70 of the top cover 7 to the first filter element 4. After being filtered by the first filter element 4, it can flow out of the second filter chamber 220 from the second tube water flow channel 60b between the first filter element 4 and the center tube 6 to complete the filtration. The structure is simple and compact, which can effectively reduce the space occupied by the composite filter element 100, is conducive to spatial layout, and can meet more installation requirements.

[0204] For the second filter cartridge 22, in some embodiments, as Figure 4 and Figure 26-Figure 31 As shown, the second filter cartridge 22 is arranged in the installation cavity 10 of the filter housing 1, and the second filter cartridge 22 is located at one axial end of the first filter cartridge 21 (for example, the lower end shown in the figure), and a second filter cavity 220 can be defined in the second filter cartridge 22, and the outer wall surface of the second filter cartridge 22 and the inner wall surface of the filter housing 1 can be spaced apart to form a second water flow gap 10a2, and the second water flow gap 10a2 is connected to the first water flow gap 10a1 to form a water flow gap 10a.

[0205] The second filter cartridge 22 may include: a first cylinder body 221, a second cylinder body 222 and a plurality of ribs 224. Specifically, a first cylinder cavity 2210 may be formed in the first cylinder body 221. In the axial direction of the first cylinder body 221, the second cylinder body 222 is connected to one end of the first cylinder body 221 adjacent to the first filter cartridge 21. A second cylinder cavity 2220 communicating with the first cylinder cavity 2210 may be formed in the second cylinder body 222.

[0206] like Fig.26 , Fig.29 and Fig.31As shown, the inner diameter of the second cylinder 222 is smaller than the inner diameter of the first cylinder 221, the outer diameter of the second cylinder 222 is smaller than the outer diameter of the first cylinder 221, a plurality of ribs 224 may be provided on the outer peripheral surface of the second cylinder 222, and the plurality of ribs 224 may be provided at intervals along the circumference of the second cylinder 222, and each rib 224 may extend radially outwardly along the second through-body cylinder 222 and be connected to the first cylinder 221. Thus, the first cylinder 221 is connected to the second cylinder 222, and a plurality of ribs 224 are provided on the outer peripheral surface of the second cylinder 222, so that the second filter chamber 220 can be constructed as a chamber with a large diameter at the bottom and a small diameter at the top, and the second filter cartridge 22 can be constructed as a rocket launcher structure.

[0207] This is beneficial to enhancing the structural strength of the second filter cartridge 22, can reduce the probability of deformation of the second filter chamber 220, and can also help ensure that the roundness of the second filter chamber 220 does not deform. It can provide effective protection for the second filter element 5 in the second filter chamber 220 and avoid the collapse of the second filter element 5. It has good stability and high reliability, and can extend the service life of the second filter element 5.

[0208] According to some embodiments of the present invention, Fig.26 , Fig.29 and Fig.31 As shown, the second filter cartridge 22 further includes: a connecting cylinder 223, which can be arranged between the first cylinder 221 and the second cylinder 222, and the connecting cylinder 223 can be connected to the first cylinder 221 and the second cylinder 222 respectively, and a connecting cylinder cavity 2230 which is connected to the first cylinder cavity 2210 and the second cylinder cavity 2220 respectively can be formed in the connecting cylinder 223. It can be understood that the first cylinder cavity 2210, the second cylinder cavity 2220 and the connecting cylinder cavity 2230 together constitute the second filter cavity 220 described above. Among them, each rib 224 is connected to the first cylinder 221, the connecting cylinder 223 and the second cylinder 222 respectively.

[0209] In other words, the first cylinder 221 and the second cylinder 222 are connected via the connecting cylinder 223, and the plurality of ribs 224 can not only enhance the strength of the first cylinder 221 and the connecting cylinder 223 themselves, but also strengthen the connection strength between the first cylinder 221 and the connecting cylinder 223 and between the connecting cylinder 223 and the second cylinder 222, thereby avoiding deformation and damage at the connection and improving reliability.

[0210] In some embodiments, Fig.31 As shown, the connecting cylinder 223 can extend along the circumferential direction and radial direction of the first cylinder 221, the outer end of the connecting cylinder 223 can be connected to the first cylinder 221, and the inner end of the connecting cylinder 223 is connected to the second cylinder 222. In other words, the connecting cylinder 223 is formed into a hollow cylindrical ring. The structure is simple and the processing is convenient.

[0211] In other embodiments, Fig.26 , Fig. 27 and Fig.29 As shown, the connecting cylinder 223 can extend along the axial direction of the first cylinder 221, one axial end of the connecting cylinder 223 (for example, the lower end shown in the figure) can be connected to the first cylinder 221, and the other axial end of the connecting cylinder 223 (that is, the upper end shown in the figure) can be connected to the second cylinder 222, and the radial dimension of the connecting cylinder 223 gradually decreases in the direction from the first cylinder 221 to the second cylinder 222. In other words, the connecting cylinder 223 is a reducing cylinder, so that the first cylinder 221 and the second cylinder 222 are connected through the reducing cylinder, which can reduce the sharp impact on the connection when the second filter cartridge 22 receives external force, and at the same time, the shape of the second filter cartridge 22 can be optimized and the aesthetics of the second filter cartridge 22 can be improved.

[0212] Alternatively, if Fig.29 As shown, in the direction from the first cylinder 221 to the second cylinder 222, the side wall of the connecting cylinder 223 can be inclined toward the central axis of the second cylinder 222, that is, the inner wall of the connecting cylinder 223 faces the second cylinder 222 and is inclined inward, thereby optimizing the internal structure of the second filter chamber 220 and facilitating the layout and installation of the second filter material 5.

[0213] Furthermore, if Fig.29 As shown, each rib 224 may include: a rib body 2241 and a rib connecting portion 2242. The rib body 2241 may be arranged on the outer circumferential surface of the second cylinder 222, and the rib body 2241 may extend radially outward of the second cylinder 222. The rib connecting portion 2242 may be connected to the axial end of the rib body 2241, and the rib connecting portion 2242 may be respectively connected to the connecting cylinder 223 and the first cylinder 221. The structure is simple and compact, which can effectively improve the strength and reliability of the second filter cartridge 22.

[0214] Alternatively, if Fig.28 As shown, a plurality of ribs 224 may be evenly spaced along the circumference of the second cylinder 222, thereby evenly providing support and protection for the second filter cartridge 22 in the circumferential direction, with good reinforcement effect and a neat and beautiful overall structure.

[0215] Optionally, each rib 224 may extend along the axial direction of the second through body, thereby forming an axially extending second water-passing gap 10a2 between adjacent ribs 224, which is beneficial to reducing the water-passing resistance and improving the smoothness of the water flow.

[0216] Optionally, each rib 224 can extend from the axial end face of the second cylinder 222 away from the first cylinder 221 (for example, the upper end face shown in the figure) to the first cylinder 221, that is, each rib 224 extends axially from one end face of the second body to connect to the first cylinder 221, which is convenient for processing and can further reduce the probability of deformation and damage of the second filter cartridge 22.

[0217] Optionally, in the cross section of the second cylinder 222 , the outer edges of the plurality of ribs 224 are located on the same imaginary circle, thereby ensuring the concentricity of the plurality of ribs 224 and the second through cylinder 22 , and further improving the installation accuracy.

[0218] Alternatively, if Fig.29 and Fig.31 As shown, in the cross section through the central axis of the first body, the outer edge of each rib 224 is flush with the outer edge of the first cylinder 221. Optionally, in the axial projection along the second body, the outer edges of the plurality of ribs 224 and the first body are located on the same imaginary circle.

[0219] That is, the outer side surface of each rib 224 is coplanar with the outer peripheral surface of the first through body. Thus, it is convenient to control the radial maximum dimension of the second filter cartridge 22, thereby ensuring the concentricity of the second filter cartridge 22 and the filter housing 1, reducing the occupied space, facilitating layout, and meeting more installation requirements.

[0220] like Fig.29 and Fig.31 As shown, a support step 7211 is provided on the outer side of one end of each rib 224 away from the first cylinder 221. The support step 7211 is suitable for cooperating with the partition plate 3 to support the partition plate 3 to achieve the installation and positioning of the second filter material 5. The specific structure of the partition plate 3 will be described in detail below.

[0221] In order to facilitate disassembly and positioning, and to assist in realizing the dual-channel technology of the composite filter element 100, a bottom cover 8 may be provided at the bottom of the filter cartridge 2. Figure 4 and Figure 6 As shown, the bottom cover 8 can be arranged at the bottom of the second filter cartridge 22, the second filter element 5 can be installed on the bottom cover 8, and the bottom cover 8 can be provided with a bottom cover water hole 80 connecting the water gap 10a and the second filter cavity 220. Thus, the bottom cover 8 can support the second filter element 5, improve the stability and reliability of the second filter element 5, and prevent water from flowing through.

[0222] According to some embodiments of the present invention, Figure 32-Figure 35 As shown, the bottom cover 8 may include a bottom cover body 81 and a cover connecting portion 82 disposed on the bottom cover body 81. The cover connecting portion 82 is annular. The bottom cover water hole 80 is disposed on the bottom cover body 81. Figure 4 and Figure 6As shown, the filter cartridge 2 (specifically the second filter cartridge 22 in the example shown) can stop at the bottom cover body 81, and the filter cartridge 2 can be sealed and connected with the cover connecting portion 82. Thus, the bottom cover 8 can be connected to the bottom of the second filter cartridge 22, and the bottom cover 8 is sealed with the second filter cartridge 22 in the circumferential direction. The water hole 80 of the bottom cover can connect the second water gap 10a2 outside the bottom cover 8 with the second filter chamber 220 in the second filter cartridge 22, so that the installation of the second filter element 5 can be facilitated, and the internal space of the second filter chamber 220 can be reasonably used.

[0223] Combination Fig.32 , Fig.34 and Fig.35 As shown, the annular connection part 212 may include: an annular first connection part 821 and an annular second connection part 822, wherein the first connection part 821 is connected to the outer peripheral edge of the bottom cover body 81, and the first connection part 821 extends toward the filter cartridge 2 along the axial direction of the filter cartridge 2, the second connection part 822 may be arranged on the side of the bottom cover body 81 facing the filter cartridge 2, and the second connection part 822 may be spaced apart from the first connection part 821 and arranged on the inner side of the first connection part 821, an annular mounting groove 823 may be formed between the first connection part 821 and the second connection part 822, the filter cartridge 2 may be inserted between the first connection part 821 and the second connection part 822, that is, the filter cartridge 2 is inserted into the mounting groove 823, and the bottom cover water hole 80 is located in the second connection part 822, the structure is simple and compact, and the installation is convenient and quick.

[0224] In some embodiments, Figure 4 and 6 As shown, the filter cartridge 2 can be stopped at the bottom cover body 81, and the filter cartridge 2 can be sealed and connected with at least one of the first connection part 821 and the second connection part 822. In other words, the bottom surface of the filter cartridge 2 stops at the upper surface of the bottom cover body 81, and the filter cartridge 2 is sealed and connected with the first connection part 821, or the filter cartridge 2 is sealed and connected with the second connection part 822, or the filter cartridge 2 is sealed and connected with the first connection part 821 and the second connection part 822 at the same time. As a result, it is convenient to assemble the bottom cover 8 and the filter cartridge 2 in place, the stability is good, and the probability of accidental detachment of the bottom cover 8 can be reduced, and the sealing reliability is high.

[0225] Optionally, an annular seal may be provided between the portion of the filter cartridge 2 inserted between the first connection portion 821 and the second connection portion 822 and at least one of the first connection portion 821 and the second connection portion 822. In other words, an annular seal may be provided between the filter cartridge 2 and the first connection portion 821, or an annular seal may be provided between the filter cartridge 2 and the second connection portion 822, or an annular seal may be provided between the filter cartridge 2 and the first connection portion 821 and between the filter cartridge 2 and the second connection portion 822, respectively. This can further improve the sealing effect and effectively prevent water from flowing in and leaking.

[0226] Optionally, a sealant may be provided between the first connection portion 821 and the second connection portion 822, and the filter cartridge 2 is sealed and connected to the first connection portion 821 and the second connection portion 822 through the sealant. In other words, the filter cartridge 2 is inserted into the annular installation groove 823 between the first connection portion 821 and the second connection portion 822, and the sealant is poured into the annular installation groove 823 to achieve a sealed connection between the filter cartridge 2 and the first connection portion 821 and the second connection portion 822, which is not easy to be misaligned, can ensure a better sealing effect, and is conducive to controlling costs.

[0227] Optionally, the filter cartridge 2 and the cover connection portion 82 can be connected by hot melting. Alternatively, the filter cartridge 2 and the cover connection portion 82 can be welded and sealed, for example, the filter cartridge 2 and the cover connection portion 82 can be connected by spin welding or ultrasonic welding. In this way, not only the connection between the filter cartridge 2 and the bottom cover 8 can be achieved, but also the sealing between the two can be achieved, which can avoid water leakage between the first filter flow channel and the second filter flow channel, and can make the various filtering functions of the composite filter element 100 more stable and reliable.

[0228] In some embodiments, Fig.35 As shown, the bottom cover water hole 80 can be arranged in the middle of the bottom cover body 81, that is, the water gap 10a outside the filter cartridge 2 is connected to the filter cavity in the filter cartridge 2 at the middle position of the bottom cover 8, so that the layout of the second filter material 5 can be optimized and the structure can be more compact. Optionally, the bottom cover water hole 80 can include a plurality of spaced-apart bottom cover 8 sub-water ports (not shown in the figure), thereby improving the uniformity of water flow when flowing through the bottom cover water hole 80, avoiding the water flow from having a violent impact on the second filter material 5 when the water pressure is too high, and providing protection for the second filter material 5 to a certain extent.

[0229] exist Figure 4 and Figure 6 In the illustrated embodiment, the composite filter element 100 further includes a middle partition plate 3. The middle partition plate 3 and its related structures are described in detail below in conjunction with the accompanying drawings.

[0230] A middle partition plate 3 is installed in the filter cartridge 2, and the middle partition plate 3 is sealed and connected to the filter cartridge 2 to separate the filter chamber in the filter cartridge 2 into a first filter chamber 210 adjacent to the waterway plate 300 and a second filter chamber 220 away from the waterway plate 300. In the illustrated embodiment. The filter cartridge 2 includes a first filter cartridge 21 and a second filter cartridge 22, and the middle partition plate 3 is connected between the first filter cartridge 21 and the second filter cartridge 22, and the middle partition plate 3 separates the first filter chamber 210 and the second filter chamber 220. That is, the middle partition plate 3 can be sealed and connected to the first filter cartridge 21 and the second filter cartridge 22, respectively, and the middle partition plate 3 is provided with a partition plate water hole 30 for connecting the first tube water flow channel 60a in the central tube 6 and the second filter chamber 220 in the second filter cartridge 22 to separate the first filter flow channel from the second filter flow channel.

[0231] Optionally, an annular seal may be provided between the middle partition plate 3 and the filter cartridge 2 to separate the first filter chamber 2 and the second filter chamber 220 to avoid water leakage.

[0232] According to some embodiments of the present invention, Figure 36-Figure 39 As shown, the middle partition disc 3 may include: a partition disc body 31 and an annular partition disc connecting portion 32. The partition disc body 31 may extend along the circumferential and radial directions of the first filter cartridge 21. The partition disc water hole 30 may be provided on the partition disc body 31. The partition disc body 31 is sealed and connected to the second filter cartridge 22. The partition disc connecting portion 32 may be connected to the outer circumferential edge of the partition disc body 31, and the partition disc connecting portion 32 may extend along the axial direction of the first filter cartridge 21. The partition disc connecting portion 32 may be sealed and connected to the first filter cartridge 21, thereby separating the first filter chamber 210 in the first filter cartridge 21 and the second filter chamber 220 in the second filter cartridge 22, preventing water leakage between the first filter chamber 210 and the second filter chamber 220, and the sealing reliability is good, and it is not easy to fail due to misalignment.

[0233] Alternatively, if Figure 4 and Figure 6 As shown, the first filter cartridge 21 extends downward beyond the middle partition disc 3, and an annular seal 33 may be provided between the first filter cartridge 21 and the partition disc connecting portion 32, that is, the inner circumference of the first filter cartridge 21 and the outer circumference of the partition disc connecting portion 32 are sealed by the annular seal 33, which facilitates disassembly and assembly and helps control costs.

[0234] Furthermore, the spacer connection portion 32 and one of the upper shells of the first filter cartridge 21 are provided with an annular sealing groove 321, and the annular seal 33 is provided in the sealing groove 321, so that the annular seal 33 can be limited in the sealing groove 321 to avoid the seal from being misplaced, and the sealing reliability is further improved. Figure 4 In the example shown, the sealing groove 321 is provided at the spacer connecting portion 32, and in the axial direction of the filter cartridge 2, the sealing groove 321 can correspond to the position of the spacer body 31. Thus, it is easy to process and assemble, the cost can be effectively controlled, and the sealing stability can be improved.

[0235] In some embodiments, a support step 7211 is provided on the second filter cartridge 22, and the partition plate connecting portion 32 can abut against the support step 7211. Specifically, the support step 7211 is provided on a plurality of ribs 224 of the second filter cartridge 22, and the partition plate connecting portion 32 abuts against the support step 7211 on the plurality of ribs 224. Thus, the second filter cartridge 22 can be used to support the partition plate connecting portion 32, and the middle partition plate 3 can be provided between the first filter cartridge 21 and the second filter cartridge 22, so as to prevent the first filter element 4 in the first filter cavity 210 from collapsing, thereby improving reliability.

[0236] According to some embodiments of the present invention, Figure 4 , Fig.38 and Fig.39 As shown, the center tube 6 is connected to the partition plate water hole 30, and a positioning support platform 311 may be provided in the partition plate water hole 30. One end of the center tube 6 abuts against the positioning support platform 311, so that the center tube 6 can be positioned in the first filter cartridge 21. The structural design is ingenious and the assembly is convenient. Optionally, the positioning support platform 311 can be formed as an annular support platform extending in the radial and circumferential directions, so that the center tube 6 can be positioned in the entire circumferential direction, with high assembly accuracy and better stability.

[0237] According to some embodiments of the present invention, Fig.39 As shown, the partition body 31 may be provided with a positioning rib 312 which surrounds the partition water hole 30 and extends axially toward the first filter cartridge 21. The center tube 6 can be inserted into the positioning rib 312, so that the positioning rib 312 can limit the center tube 6 in the circumferential direction to prevent the center tube 6 from tilting. The positioning rib 312 cooperates with the positioning support platform 311 to stably install the center tube 6 on the middle partition 3.

[0238] Optionally, a receiving groove 611 may be provided on one of the positioning rib 312 and the central tube 6, and a sealing ring for sealing the gap between the central tube 6 and the middle partition plate 3 may be provided in the receiving groove 611, that is, the sealing ring seals and connects the first tube water passage 60a and the partition plate water passage hole 30. For example, in the example illustrated in the accompanying drawings, a receiving groove 611 is provided on the central tube 6, and the sealing ring is sleeved on the central tube 6 and accommodated in the receiving groove 611. Therefore, when the central tube 6 is installed in the positioning rib 312, the sealing ring seals the gap between the central tube 6 and the positioning rib 312 to connect the partition plate water passage hole 30 and the first tube water passage 60a. The structure is simple and compact, the sealing effect is good, and it is easy to disassemble and assemble, which is conducive to controlling costs.

[0239] In one embodiment of the present invention, the composite filter element 100 includes a central tube 6, which is disposed in the first filter cavity 210, and one end of the central tube 6 is connected to the middle partition plate 3, and the other end of the central tube 6 passes through the first filter cartridge 21. A first tube water passage 60a communicating with the second filter cavity 220 may be formed in the central tube 6, and the first tube water passage 60a is isolated from the first filter cavity 210. Thus, the central tube 6 can pass through the first filter cavity 210 and communicate with the second filter cavity 220, so as to realize the mutual isolation of the first filter flow channel and the second filter flow channel, so that the first filter flow channel and the second filter flow channel can be filtered separately without affecting each other, with a compact structure and ingenious design.

[0240] like Figure 40-Figure 43As shown, the central tube 6 is arranged in the first filter chamber 210, and one end of the central tube is connected to the middle partition plate. In the illustrated example, the central tube 6 is arranged in the filter channel 40 in the first filter material 4. The central tube 6 may include: a tube body 61 and a plurality of baffles 62, wherein a first tube water passage 60a is formed in the tube body 61, a plurality of baffles 62 may be arranged on the outer peripheral surface of the tube body 61, and a plurality of baffles 62 may be arranged at intervals along the circumference of the tube body 61, and each baffle 62 may extend radially outward along the tube body 61 to form a second tube water passage 60b between two adjacent baffles 62 and the first filter material 4.

[0241] That is to say, a first water passage 60a is formed in the hollow tube body 61, and a plurality of baffles 62 are arranged on the outer peripheral surface of the tube body 61 and extend outward, so that a second water passage 60b can be formed between the outer peripheral surface of the tube body 61, two adjacent baffles 62 and the inner wall surface of the filter channel 40 in the first filter material 4. The first water passage 60a and the second water passage 60b are respectively on the inner and outer sides of the tube body 61, independent of each other, and not connected to each other.

[0242] Thus, the plurality of baffles 62 can support the first filter material 4, improve the strength of the second filter material 5, prevent the filter material from deforming and collapsing, improve the filtering stability, and form the second tube water passage 60b, so that the first tube water passage 60a and the second tube water passage 60b are independently arranged, the structural design is ingenious, and the space utilization rate is high.

[0243] Alternatively, if Fig.40 and Fig.42 As shown, a plurality of baffles 62 may be evenly spaced along the circumference of the tube body 61, thereby forming a plurality of evenly distributed flow channels on the outer circumference of the tube body 61, so that water flows smoothly and stably, thereby improving the filtering effect.

[0244] Optionally, in the axial direction of the pipe body 61, both ends of each baffle 62 may have a gap with both ends of the pipe body 61 in the axial direction of the pipe body 61. That is, each baffle 62 is located in the middle of the pipe body 61. Thus, a pipe section can be reserved for assembling the central pipe 6 with the waterway plate 300 and the middle partition plate 3.

[0245] In some embodiments of the present invention, Fig.43As shown, each baffle 62 may include: a baffle body 621 and a guide portion 622, wherein the baffle body 621 may be disposed on the outer circumferential surface of the tube body 61, and the baffle body 621 may extend radially outward, the guide portion 622 may be connected to the axial end of the body, and the guide portion 622 may be connected to the tube body 61, and the outer side surface of the guide portion 622 is an inclined surface extending away from the baffle body 621 and obliquely toward the central axis of the tube body 61. For example, in the illustrated example, the tube body 61 is oriented in the up-down direction, and each baffle 62 includes a baffle body 621 and two guide portions 622 disposed at the upper and lower ends of the baffle body 621, wherein the outer side surface of the upper guide portion 622 extends obliquely upward and inward, and the outer side surface of the lower guide portion 622 extends obliquely downward and inward.

[0246] Therefore, during installation, the inclined surface on the guide portion 622 can provide an auxiliary function, which is conducive to installing the central tube 6 into the filter channel 40 in the first filter material 4, which can reduce the difficulty of assembly, improve assembly efficiency, and reduce assembly errors.

[0247] Optionally, the first pipe water passage 60a extends along the axial direction of the pipe body 61, such as Fig.43 As shown, the first tube water passage 60a can pass through from one axial end face of the tube body 61 to the other axial end face of the tube body 61, that is, the first tube water passage 60a passes through both ends of the tube body 61 along the axial direction of the tube body 61, with a compact structure, convenient processing and manufacturing, and easy assembly.

[0248] In some embodiments, Fig.42 As shown, the cross-section of the tube body 61 and the cross-section of the first tube water passage 60a can both be circular, that is, the tube body 61 is a circular tube, and the first tube water passage 60a is a circular passage, and, within the cross-section of the tube body 61, the outer edges of the plurality of baffles 62 can be located on the same imaginary circle, thereby, the plurality of baffles 62 can stop against the inner circumferential surface of the first filter material 4, and the concentricity between the first filter material 4 and the first filter chamber 210 can be improved, so that water passes smoothly and the filtering effect is good.

[0249] like Fig.43 As shown, the two axial ends of the tube body 61 are respectively provided with receiving grooves 611 suitable for receiving the sealing member, and the receiving grooves 611 are provided on the outer peripheral surface of the tube body 61 and extend along the circumference of the tube body 61 to form a closed ring. In this way, after the center tube 6 is installed in the first filter cartridge 21, the sealing member at the top can seal the gap between the annular sealing rib 3013 in the first installation connection seat 3011 and the center tube 6, and at the same time, the sealing member at the bottom can seal the gap between the water hole 30 of the partition plate and the center tube 6, thereby realizing the mutual independence of the first filter flow channel and the second filter flow channel to avoid water cross-talk.

[0250] Optionally, there may be multiple accommodating grooves 611, and the multiple accommodating grooves 611 may be arranged at axial intervals along the tube body 61, so that multiple sealing rings can be installed to seal the gaps between the center tube 6 and the middle partition plate 3 and between the center tube 6 and the waterway plate 300, thereby further avoiding water cross-talk and water leakage, improving the filtering stability, and extending the service life of the composite filter element 100.

[0251] Advantageously, the central tube 6 can be an integrally formed part. In other words, the tube body 61 and the plurality of baffles 62 can be integrally formed, which is convenient for processing and manufacturing, and can omit the assembly process to avoid errors caused by assembly. The concentricity of the first filter material 4 and the first filter chamber 210 is also ensured at the same time, so that water flows smoothly and stably, and the filtering effect is better.

[0252] The central tube 6, the middle partition plate 3, together with the first filter cartridge 21 and the second filter cartridge 22, can constitute an isolation component for isolating the first filter channel and the second filter channel.

[0253] For the first filter element 4 and the second filter element 5, the combination Figure 2 , Figure 4 and Figure 6 As shown, the first filter element 4 is installed in the first filter cavity 210, the second filter element 5 can be located at one axial end of the first filter element 4, and the second filter element 5 is installed in the second filter cavity 220. In the direction of water flow, the second filter element 5 can be located downstream of the first filter element 4, and in the axial direction of the filter housing 1, the second-stage filter material is located downstream of the first-stage filter material, and in the axial direction of the filter housing, the length L1 of the first-stage filter material and the length L2 of the second-stage filter material satisfy: 0.5≤L2 / L1≤1.

[0254] That is to say, the filter elements are arranged in sections, and the first filter element 4 and the second filter element 5 are distributed in the axial direction. The water to be filtered can be filtered by the first filter element 4 first, and then filtered by the second filter element 5, that is, the first filter element 4 is a pre-filter material core, the second filter element 5 is a post-filter material core, and the length ratio of the pre-filter material core to the post-filter material core is 1:1 to 1:5. In this way, the waterway layout during the filtration process can be optimized, the occupied space can be reduced, and the expected service life of the first filter element 4 and the second filter element 5 can be matched, which can reduce the replacement frequency and help control costs.

[0255] It should be noted here that, in the direction of water flow, the second filter element 5 is located downstream of the first filter element 4. The water flow may be initially filtered through the first filter element 4 and then directly filtered through the second filter element 5 again. Alternatively, the water flow may be initially filtered through the first filter element 4 and then filtered for a second time through other filter components (for example, the second filter element 200 shown in the accompanying drawings) and then flow through the second filter element 5 for further filtration.

[0256] Optionally, the minimum inner diameter of the filter housing 1 may be D1, and the maximum outer diameter of the filter cartridge 2 may be D2, and D1 and D2 may satisfy: D1-D2≥0.5mm. In other words, the annular water gap 10a formed between the inner circumference of the filter housing 1 and the outer circumference of the filter cartridge 2 may have a size of more than 0.25mm. For example, there may be a gap of 0.5mm between the inner circumference of the filter housing 1 and the outer circumference of the filter cartridge 2, and at this time, D1-D2=10mm. Of course, the present invention is not limited to this, and the gap formed between the inner circumference of the filter housing 1 and the outer circumference of the filter cartridge 2 may also be of other sizes. In this way, the water flow resistance in the first filter channel can be reduced, the water flow can be smooth, the filtering effect can be improved, and the purified water output can be stable.

[0257] Optionally, the minimum inner diameter d of the first water passage 60a in the central tube 6 may satisfy: d≥3mm. For example, the inner diameter of the first water passage 60a may be 3mm, 5mm, 10mm, etc. Thus, the water pressure in the first water passage 60a may be reduced, the filtering effect is good, and the purified water output is smooth and stable.

[0258] According to some embodiments of the present invention, each of the first filter element 4 and the second filter element 5 may include at least one filter material, and different impurities in water may be filtered out through different filter materials in a targeted manner, thereby improving the taste quality of water and expanding the filtering function of the composite filter element 100. For example, in the illustrated example, the first filter element 4 includes one filter material, and the second filter material 5 includes two-stage filter materials.

[0259] In some embodiments, the second filter element 5 may include multi-stage filter materials, and the multi-stage filter materials may be distributed axially in the second filter cavity 220. Thus, the filtering function of the post-filter element can be expanded, the water quality and taste of the outlet water can be further optimized, and the internal space of the second filter cavity 220 can be reasonably utilized, the structural layout is reasonable and ingenious, and the disassembly and assembly are convenient.

[0260] Alternatively, if Figure 4 and Figure 6 As shown, the second filter material 5 may include a first filter material 51 in a cylindrical shape and a second filter material 52 in a cylindrical shape. The second filter material 52 may be arranged at one end (e.g., the upper end shown in the figure) of the first filter material 51 adjacent to the first filter element 4. The first filter material 51 and the second filter material 52 may be separated by a partition plate 53. In this way, the first filter material 51 and the second filter material 52 may be arranged in the axial direction, so that when the water flows from the water gap 10a through the second filter cavity 220 to the first tube filter channel 6a, it passes through the first filter material 51 and the second filter material 52 in sequence to achieve two-stage filtration, with a simple and compact structure and good filtration effect.

[0261] Furthermore, if Figure 4 and Figure 6As shown, the first filter material 51 may have a first filter channel 510, the second filter material 52 may have a second filter channel 520, the first filter channel 510 is connected to the water gap 10a, and the second filter channel 520 is connected to the first pipe water passage 60a. In this way, the water in the water gap 10a can flow into the first filter channel 510, and then flow to the second filter material 52 after being filtered by the first filter material 51, and then flow from the second filter channel 520 to the first pipe water passage 60a after being filtered by the second filter material 52, and finally output.

[0262] Among them, the first filter element 4 and the second filter element 5 can be adaptively set by those skilled in the art according to factors such as demand, cost, and installation space. For example, the first filter element 4 includes a filter material, and the second filter element 5 includes two-stage filter materials, and the filter materials include but are not limited to filter screens, filter cloths, activated carbon, PP cotton, etc. The present invention does not make specific limitations on this.

[0263] Combine the following Figure 4 and Figure 6 The filter element assembly 1000 and the filtering process thereof according to a specific embodiment of the present invention are described in detail.

[0264] In this embodiment, the filter element assembly 1000 includes a waterway plate 300, a first filter element and a second filter element 200, wherein the first filter element is a composite filter element 100, and the second filter element 200 is a reverse osmosis filter element, that is, the pre-filter element and the post-filter element in the prior art are integrated into the composite filter element 100 in this embodiment, the composite filter element 100 is installed on the first connecting seat 3011, and the second filter element 200 reverse osmosis filter element is installed on the second connecting seat 3012, the central axis of the composite filter element 100 and the central axis of the second filter element 200 are both oriented in the up and down direction, and the composite filter element 100 and the second filter element 200 are substantially perpendicular to the waterway plate 300.

[0265] When the filter element assembly 1000 is in use, the first filter flow channel and the second filter flow channel in the composite filter element 100 are independent of each other and are not connected to each other.

[0266] Specifically, when the filter element assembly 1000 is in use, water from the outside enters the composite filter element 100 from the waterway plate 300, as shown by the solid straight arrow in the figure, and the water passes through the top cover water flow channel 70 between the top cover support rib 74 and the first filter cartridge 21 and enters the first filter chamber 210, and is filtered by the first filter element 4. The water flows from the outside to the inside, and then flows into the second tube water channel 60b between the first filter material 4 and the tube body 61, and then flows out from the water channel 302 on the waterway plate 300, completing the pre-filtration process in the second filter flow channel 1002.

[0267] The water filtered by the pre-filter can flow to the second filter element 200 for secondary filtration. In the present embodiment, the second filter element 200 is a reverse osmosis filter element. The filtration process of the reverse osmosis filter element is well known to those skilled in the art and will not be described in detail here.

[0268] The water filtered by the second filter element 200 can flow into the filter housing 1 from the waterway plate 300. Figure 4 As shown by the hollow straight arrow in the figure, water flows from the first water gap 10a1 between the filter housing 1 and the first filter cartridge 21 to the second water gap 10a2 between the filter housing 1 and the second filter cartridge 22, and then flows into the second filter chamber 220 from the bottom cover water hole 80 on the bottom cover 8, and is filtered by the first filter material 51 from the first filter material water channel 510, and then flows from the edge of the isolation plate 53 to the second filter material 52, and after being filtered by the second filter material 52, it flows into the second filter material water channel 520, passes through the partition plate water hole 30 on the middle partition plate 3, and then flows from the first pipe water channel 60a to the waterway plate 300, completing the post-filtration process in the first filter flow channel, and then passes through the waterway plate 300 to output the filtered clean water.

[0269] In the above embodiment of the present invention, the filtering process in the first filtering channel is different from the filtering process in the second filtering channel, and continuous filtering can be achieved by cooperating with the reverse osmosis filter element. Of course, it can be understood that the filtering process in the first filtering channel can also be the same as the filtering process in the second filtering channel, and the composite filter element 100 and the second filter element 200 can perform separate filtering processes in parallel.

[0270] The water treatment equipment according to the embodiment of the present invention comprises the filter element assembly 1000 according to the above embodiment of the present invention, and the filter element assembly 1000 has the composite filter element 100 of the above embodiment.

[0271] According to the water treatment equipment of the embodiment of the present invention, by setting the above-mentioned composite filter element 100, dual-channel independent filtration can be achieved, the filtration effect is good, and the structure is simple and compact, which is conducive to reasonable layout, convenient and labor-saving disassembly and assembly, and can save repair and maintenance costs. In addition, the occupied space is reduced, which can meet more installation requirements.

[0272] The water treatment device may be a water purifier, a water purifier, a water dispenser, etc. Other structures and operations of the water treatment device according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0273] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0274] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A composite filter element, characterized in that: include: A filter housing, wherein a mounting cavity is defined in the filter housing; A filter cartridge, the filter cartridge is arranged in the installation cavity and forms a first filter flow channel and a second filter flow channel isolated from each other with the filter housing, wherein a first filter element for filtering the fluid in the first filter flow channel is arranged in the first filter flow channel, and a second filter element for filtering the fluid in the second filter flow channel is arranged in the second filter flow channel; an isolation assembly for isolating the first filter channel and the second filter channel, the isolation assembly comprising a top cover, The top cover is pivotally arranged in the filter cartridge, a slide groove is arranged on one of the filter cartridge and the top cover, and a matching portion connected to the slide groove is arranged on the other of the filter cartridge and the top cover, and the matching portion is slidably matched with the slide groove along the circumference of the filter cartridge; A middle partition plate is installed in the filter cartridge, the filter cartridge includes a first filter cartridge and a second filter cartridge, the middle partition plate is connected between the first filter cartridge and the second filter cartridge, and the middle partition plate separates the first filter cavity and the second filter cavity, and the middle partition plate is provided with a partition plate water hole for connecting the first tube water flow channel in the central tube and the second filter cavity in the second filter cartridge, so as to isolate the first filter flow channel from the second filter flow channel; The composite filter element comprises a central tube, which is arranged in the first filter cavity, and one end of the central tube is connected to the middle partition plate, and the other end of the central tube passes through the first filter cartridge, and a first tube water passage communicating with the second filter cavity is formed in the central tube, and the first tube water passage is isolated from the first filter cavity; The central tube is in communication with the water hole of the partition plate; The central tube comprises: a tube body and a plurality of baffles, wherein a first tube water passage is formed in the tube body, a plurality of baffles are arranged on the outer peripheral surface of the tube body, and the plurality of baffles are arranged at intervals along the circumferential direction of the tube body, and each baffle extends radially outwardly along the tube body to form a second tube water passage between two adjacent baffles and the first filter element; A first filter cavity is defined in the first filter cartridge, the first filter element is installed in the first filter cavity, and the outer circumference of the first filter cartridge is spaced apart from the inner circumference of the filter housing to form a first water-passing gap; A second filter cavity is defined in the second filter cartridge, the second filter element is installed in the second filter cavity, the outer wall surface of the second filter cavity is spaced apart from the inner wall surface of the filter housing to form a second water flow gap connected to the first water flow gap, and the first water flow gap and the second water flow gap together constitute a water flow gap; A bottom cover is provided at the bottom of the filter cartridge, the second filter element is mounted on the bottom cover, and a bottom cover water hole communicating with the water gap and the filter cavity is provided on the bottom cover.

2. The composite filter element according to claim 1, characterized in that: The slide groove is arranged on the top cover, and the matching portion is arranged on the filter cartridge.

3. The composite filter element according to claim 2, characterized in that: In the axial direction of the filter cartridge, the height of the slide groove is greater than the thickness of the matching portion, and the difference between the height of the slide groove and the thickness of the matching portion is greater than or equal to 0.5 mm.

4. The composite filter element according to claim 2, characterized in that: The matching portion is arranged on the filter cartridge and extends toward the central axis of the filter cartridge. The surface of the top cover is provided with a supporting section, and the supporting section is connected to a hanging section extending away from the central axis of the filter cartridge. The supporting section and the hanging section together constitute the slide groove.

5. The composite filter element according to claim 4, characterized in that: The matching portion extends radially toward the central axis of the filter cartridge, the supporting section extends axially away from the top cover of the filter cartridge, and the hanging section extends radially outwardly of the filter cartridge.

6. The composite filter element according to claim 4, characterized in that: A limiting portion is provided on the top cover at the front end of the sliding direction of the matching portion.

7. The composite filter element according to claim 6, characterized in that: The limiting portion is formed as a limiting plate and is respectively connected to the supporting section, the hanging section and the top cover.

8. The composite filter element according to claim 2, characterized in that: The matching portion is provided with at least one process hole penetrating the matching portion along the axial direction of the filter cartridge.

9. The composite filter element according to claim 4, characterized in that: The hanging section is constructed in a fan-shaped shape extending along the circumference of the top cover, and the central angle corresponding to the hanging section is greater than or equal to 15°.

10. The composite filter element according to any one of claims 1 to 9, characterized in that: The slide grooves are multiple and spaced apart along the circumference of the top cover, and the matching portions are multiple and correspond one to one with the slide grooves.

11. The composite filter element according to claim 10, characterized in that: The plurality of slide grooves are evenly spaced and distributed along the circumference of the filter cartridge, and the plurality of matching portions are evenly spaced and distributed along the circumference of the filter cartridge.

12. The composite filter element according to any one of claims 1 to 9, characterized in that: The top cover is provided with a top water pipe.

13. The composite filter element according to any one of claims 1 to 9, characterized in that: A top cover supporting structure is provided on the outer peripheral surface of the top cover to form a top cover water passage between the top cover and the filter cartridge.

14. The composite filter element according to claim 13, characterized in that: An extension height of the top cover support structure along the radial direction of the top cover is greater than or equal to 0.5 mm.

15. The composite filter element according to claim 13, characterized in that: The support structure is configured as a plurality of top cover support ribs spaced apart along the circumference of the top cover, and each of the top cover support ribs extends along the axial direction of the filter cartridge.

16. The composite filter element according to claim 15, characterized in that: Each of the top cover support ribs abuts against the inner wall surface of the filter cartridge.

17. A water treatment device, characterized in that: include: A waterway plate, wherein a filter element connecting seat is provided on the waterway plate; A filter element, wherein the filter element is a composite filter element as described in any one of claims 1 to 16, and the composite filter element is detachably connected to the filter element connecting seat.

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