Mother-daughter composite filter cartridge and water purifier

Abstract

This invention discloses a mother-daughter composite filter element and a water purifier. The mother-daughter composite filter element includes: a mother filter bottle, comprising an outer cylinder, the outer cylinder having independent composite water filtration channels and a water outlet channel, the mother filter element being disposed within the composite water filtration channels, and the wall of the outer cylinder being concave inward to form an inner cylinder; and a daughter filter bottle, replaceably embedded in the inner cylinder, the daughter filter bottle having a post-filtration channel, the post-filtration channel containing the daughter filter element, and the composite water filtration channels and the water outlet channel being connected through the post-filtration channel. The mother-daughter composite filter element of this invention has a large mounting surface between the daughter filter bottle and the mother filter bottle, ensuring stable installation, and allows for individual replacement of the daughter filter bottle without replacing the mother filter bottle, thereby reducing filter replacement costs and eliminating the need to disassemble the mother filter bottle from the main unit connection port of the water purifier, preventing leakage at the main unit connection port caused by disassembling the mother filter bottle.

Description

Technical Field

[0001] This invention relates to the field of water purifier technology, and in particular, to a composite filter cartridge and a water purifier. Background Technology

[0002] Currently, most composite filter cartridges on the market combine multiple filter cartridges of different grades into one unit, requiring complete disposal and replacement. However, due to the varying lifespans of each filter cartridge, replacing them periodically, even with only the minimum lifespan option, leads to waste of filter material and increased replacement costs. Furthermore, the water inlets connected to the main unit of the water purifier are also multiple independent inlets. Due to manufacturing precision limitations, there may be slight misalignment between the main unit connection and the inlets on the composite filter cartridge. Excessive disassembly and reassembly of the filter cartridge can result in unstable installation and leaks. Summary of the Invention

[0003] The purpose of this invention is to provide a composite filter cartridge and a water purifier to solve the problems of existing composite filter cartridges requiring complete replacement, high replacement costs, and instability leading to leakage due to frequent disassembly and assembly.

[0004] The above-mentioned objectives of the present invention can be achieved by the following technical solutions:

[0005] This invention provides a mother-daughter composite filter element, comprising:

[0006] A mother filter bottle includes an outer cylinder, which has an independent composite water filtration channel and an outlet channel. The composite water filtration channel contains a mother filter element, and the wall of the outer cylinder is recessed inward to form an inner cylinder.

[0007] The sub-filter bottle is replaceably installed in the inner cylinder. The sub-filter bottle is provided with a post-filtration channel. The post-filtration channel is provided with a sub-filter element. The composite filtration channel and the outlet channel are connected through the post-filtration channel.

[0008] In an embodiment of the present invention, the mother filter element includes a pre-filter element and a main filter element, and the pre-filter element and the main filter element are sequentially installed in the composite water filtration channel along the water flow direction.

[0009] In an embodiment of the present invention, the inner cavity of the outer cylinder includes a front cavity and a rear annular cavity formed between the outer cylinder and the inner cylinder. The main filter element is installed in the front cavity, and the rear annular cavity is used to provide installation space for the pre-filter element.

[0010] In an embodiment of the present invention, the pre-filter is installed in the rear annular cavity.

[0011] In an embodiment of the present invention, a portion of the pre-filter is fitted outside the main filter, and another portion of the pre-filter extends into the rear annular cavity.

[0012] In an embodiment of the present invention, the composite water filtration channel includes a first water path and a second water path that are independent of each other. The outer cylinder is provided with a first water inlet and a first water outlet connected to the first water path, a second water inlet connected to the second water path, and a second water outlet connecting the second water path and the post-water filtration channel. The pre-filter element is located in the first water path, and the main filter element is located in the second water path.

[0013] In an embodiment of the present invention, the outer cylinder is provided with a central pipe and a surrounding plate. The central pipe passes through the main filter element and the pipe of the central pipe forms the water outlet channel. The surrounding plate is located between the inner wall of the outer cylinder and the pipe wall of the central pipe and encloses the main filter element. The space between the pipe wall of the central pipe and the inner wall of the outer cylinder is divided into a first water channel and a second water channel that are independent of each other by the surrounding plate.

[0014] In an embodiment of the present invention, the composite water filtration channel includes a first water path, the pre-filter and the main filter are installed in the first water path along the water flow direction, and the outer cylinder is provided with a first water inlet connected to the first water path and a first water outlet connected to the first water path and the rear water filtration channel respectively.

[0015] In an embodiment of the present invention, the outer cylinder is provided with a wastewater outlet that communicates with the composite water filtration channel.

[0016] In an embodiment of the present invention, the sub-filter bottle and the inner cylinder are connected by a detachable connection structure.

[0017] In an embodiment of the present invention, the detachable structure includes a first snap-fit ​​boss, a first snap-fit ​​groove, and a positioning port; the first snap-fit ​​boss is disposed on the sub-filter bottle, the first snap-fit ​​groove is disposed on the inner wall surface of the inner cylinder, and the positioning port is disposed at the opening of the inner cylinder and communicates with the first snap-fit ​​groove, for the first snap-fit ​​boss to snap into the first snap-fit ​​groove; or the first snap-fit ​​boss is disposed on the inner wall surface of the inner cylinder, the first snap-fit ​​groove is disposed on the sub-filter bottle, and the positioning port is disposed on the sub-filter bottle and communicates with the first snap-fit ​​groove, for the first snap-fit ​​boss to snap into the first snap-fit ​​groove.

[0018] In an embodiment of the present invention, the sub-filter bottle includes an inner insert and a handle. The inner insert is inserted into the inner cylinder, and the handle is engaged at the opening of the inner cylinder.

[0019] In an embodiment of the present invention, the mother filter bottle is connected to the whole water purifier via a connector. The connector is provided with a second snap-fit ​​groove, and the mother filter bottle is provided with a second snap-fit ​​boss that mates with the second snap-fit ​​groove. The circumferential mating surfaces of the second snap-fit ​​groove and the second snap-fit ​​boss are provided with mating protrusions and grooves.

[0020] The present invention also provides a water purifier, including the above-mentioned mother-daughter composite filter element.

[0021] The features and advantages of this invention are:

[0022] The present invention relates to a composite filter element consisting of a mother filter element and a daughter filter element, which are respectively installed inside a mother filter bottle and a daughter filter bottle. The outer wall of the mother filter bottle is recessed inward to form an inner cylinder, thereby allowing the daughter filter bottle to be replaceably embedded in the inner cylinder. The inner cylinder wraps and limits a portion of the daughter filter bottle's side. The installation surface between the daughter filter bottle and the mother filter bottle is large, resulting in a stable installation. Furthermore, when the daughter filter element in the daughter filter bottle reaches the end of its service life, the daughter filter bottle can be replaced separately without replacing the mother filter bottle, thus reducing the cost of filter replacement. It also eliminates the need to remove the mother filter bottle from the main unit connection port of the water purifier, avoiding water leakage at the main unit connection port caused by disassembling and assembling the mother filter bottle. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an exploded perspective view of the mother-daughter composite filter element of the present invention.

[0025] Figure 2 This is a partial structural diagram of the mother filter bottle of the mother-daughter composite filter element of the present invention.

[0026] Figure 3 This is a three-dimensional structural diagram of the sub-filter bottle of the mother-daughter composite filter element of the present invention.

[0027] Figure 4 This is a front sectional view of the first embodiment of the mother-daughter composite filter element of the present invention.

[0028] Figure 5 This is a side cross-sectional schematic diagram of the first embodiment of the mother-daughter composite filter element of the present invention.

[0029] Figure 6 This is a side cross-sectional schematic diagram of the first embodiment of the mother-daughter composite filter element of the present invention.

[0030] Figure 7 This is a side cross-sectional schematic diagram of the first embodiment of the mother-daughter composite filter element of the present invention.

[0031] Figure 8 This is a partial cross-sectional schematic diagram of the first embodiment of the mother-daughter composite filter element of the present invention.

[0032] Figure 9 This is a partial cross-sectional schematic diagram of the first embodiment of the mother-daughter composite filter element of the present invention.

[0033] Figure 10 This is a front sectional view of a second embodiment of the mother-daughter composite filter element of the present invention.

[0034] Figure 11 This is a partial cross-sectional schematic diagram of a second embodiment of the mother-daughter composite filter element of the present invention.

[0035] Figure 12 This is a partial cross-sectional schematic diagram of a second embodiment of the mother-daughter composite filter element of the present invention.

[0036] Figure 13 This is a front sectional view of the third embodiment of the mother-daughter composite filter element of the present invention.

[0037] Figure 14 This is a partial cross-sectional schematic diagram of the third embodiment of the mother-daughter composite filter element of the present invention.

[0038] Figure 15 This is a partial cross-sectional schematic diagram of the third embodiment of the mother-daughter composite filter element of the present invention.

[0039] Figure 16 This is a cross-sectional view of another embodiment of the detachable connection structure of the present invention.

[0040] In the picture:

[0041] 1. Mother filter bottle; 11. Mother filter element; 111. Pre-filter element; 112. Main filter element; 12. First water inlet connector; 121. First water inlet; 13. Second water inlet connector; 131. Second water inlet; 14. Wastewater outlet connector; 141. Wastewater outlet; 15. First water outlet connector; 151. First water outlet; 151'. First water outlet; 16. Second snap-fit ​​boss; 17. Second water outlet;

[0042] 2. Outer cylinder; 21. Front cavity; 22. Rear annular cavity; 23. Enclosure plate; 231. Inner enclosure plate; 232. Outer enclosure plate; 233. Bottom plate; 24. Limiting plate; 241. First bottom limiting annular groove; 24'. Limiting plate; 25. Top cover; 26. First top limiting annular groove; 27. First bottom limiting annular groove; 27'. First bottom limiting annular groove; 28. Second top limiting annular groove; 28'. Second top limiting annular groove; 29. ​​Second bottom limiting annular groove;

[0043] 3. Inner cylinder; 31. First snap-fit ​​groove; 32. Positioning port;

[0044] 4. Sub-filter bottle; 41. Sub-filter element; 42. First snap-fit ​​boss; 43. Inner insert; 44. Handle; 45. Third inlet; 46. Third outlet;

[0045] 5. Connector; 51. Second snap-fit ​​groove; 52. Limiting groove;

[0046] 6. Central pipe; 61. Outlet channel; 62. Inlet connector; 63. Outlet connector;

[0047] 7. Composite water filtration channel; 71. First water path; 72. Second water path;

[0048] 8. Post-filter channel;

[0049] 9. Disassembly and assembly connection structure; 91. Frame; 911. Housing; 912. Slider; 913. Elastic element; 92. First snap-fit ​​part; 93. Boss; 94. Second snap-fit ​​part; 95. Groove. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Implementation Method 1

[0052] like Figure 1 As shown, the present invention provides a composite filter element comprising a mother filter bottle 1 and a daughter filter bottle 4, wherein: the mother filter bottle 1 includes an outer cylinder 2, the outer cylinder 2 is provided with an independent composite water filtration channel 7 and an outlet water channel 61, the composite water filtration channel 7 is provided with a mother filter element 11, and the wall of the outer cylinder 2 is recessed inward to form an inner cylinder 3; the daughter filter bottle 4 is replaceably embedded in the inner cylinder 3, the daughter filter bottle 4 is provided with a post-water filtration channel 8, the post-water filtration channel 8 is provided with a daughter filter element 41, and the composite water filtration channel 7 and the outlet water channel 61 are connected through the post-water filtration channel 8.

[0053] The present invention relates to a composite filter element consisting of a mother filter element 11 and a daughter filter element 41, which are respectively installed in a mother filter bottle 1 and a daughter filter bottle 4. The outer cylinder 2 of the mother filter bottle 1 is recessed inward to form an inner cylinder 3, thereby allowing the daughter filter bottle 4 to be replaceably embedded in the inner cylinder 3. The installation surface between the daughter filter bottle 4 and the mother filter bottle 1 is large, ensuring a stable installation. Furthermore, when the daughter filter element 41 in the daughter filter bottle 4 reaches the end of its service life, the daughter filter bottle 4 can be replaced separately without replacing the mother filter bottle 1, thus reducing the cost of filter replacement. It also eliminates the need to remove the mother filter bottle 1 from the main unit connection port of the water purifier, preventing water leakage at the main unit connection port caused by disassembling and assembling the mother filter bottle 1.

[0054] In this embodiment, the mother filter bottle 1 is connected to the main unit connection port of the water purifier. The raw water in the water purifier is initially filtered by the mother filter element 11 in the composite water filtration channel 7 of the mother filter bottle 1 and then enters the post-water filtration channel 8 of the sub-filter bottle 4. After being further filtered by the sub-filter element 41 in the post-water filtration channel 8, it enters the water outlet channel 61 in the mother filter bottle 1 and is finally discharged.

[0055] Specifically, the top of the main filter bottle 1 is connected to the entire water purifier via connector 5, and the bottom of the main filter bottle 1 is nested with the sub-filter bottle 2 via inner cylinder 3. Depending on the service life of the main filter element 11 and the sub-filter element 41, the sub-filter bottle 2 can be replaced individually by operating it separately, without operating the main filter bottle 1; or both the main filter bottle 1 and the sub-filter bottle 2 can be replaced simultaneously by operating the main filter bottle 1 separately.

[0056] like Figure 1 As shown, specifically, the outer cylinder 2 is generally hollow, and the bottom of the outer cylinder 2 is recessed inward along the axial direction to form the inner cylinder 3. The bottom of the inner cylinder 3 is provided with a second outlet 17 that communicates with the composite water filtration channel 7 (e.g., ...). Figure 9 (as shown) or the first outlet 151' (as shown) Figure 12 and Figure 15 As shown), and an input connector 62 connected to the outlet channel 61, the top of the sub-filter bottle 4 is provided with a third inlet 45 and a third outlet 46 connected to the post-filter channel 8. When replacing the sub-filter bottle 4, the sub-filter bottle 4 is inserted into the inner cylinder 3 for mounting and fixing, and the inner cylinder 3 wraps around a part of the side of the sub-filter bottle 4 for limiting, so that the sub-filter bottle 4 is installed firmly and ensures that the third inlet 45 of the post-filter channel 8 is connected to the second outlet 17 of the composite filter channel 7 (as shown). Figure 9 (as shown) or the first outlet 151' (as shown) Figure 12 and Figure 15(As shown) The connection is stable, and the connection between the third outlet 46 of the post-filter channel 8 and the input connector 62 of the outlet channel 61 is stable. Furthermore, the sub-filter bottle 4 is axially inserted into the inner cylinder 3 of the mother filter bottle 1. Compared to the existing mother-daughter composite filter element formed by the mother filter element 11 being fitted onto the sub-filter element 41, this reduces the overall radial dimension of the mother-daughter composite filter element while increasing the axial dimension. This results in a corresponding increase in the axial dimensions of the composite filter channel 7 in the outer cylinder 2 and the post-filter channel 8 in the sub-filter bottle 4, thereby increasing the contact area between the water flow in the composite filter channel 7 and the outer surface of the mother filter element 11, and the contact area between the water flow in the post-filter channel 8 and the outer surface of the sub-filter element 41, which is beneficial for improving filtration efficiency. Optionally, the inner cylinder 3 can also be formed by an inward indentation from the side of the outer cylinder 2.

[0057] According to one embodiment of the present invention, such as Figure 4 , Figure 10 as well as Figure 13 As shown, the mother filter element 11 includes a pre-filter element 111 and a main filter element 112, which are sequentially installed in the composite water filtration channel 7 along the water flow direction. After the water in the composite water filtration channel 7 undergoes dual filtration through the pre-filter element 111 and the main filter element 112, the water quality entering the post-filter channel 8 is improved, which helps protect the sub-filter element 41 and thus extends its service life. Optionally, the mother filter element 11 may only include one or more pre-filter elements 111 installed separately in the composite water filtration channel 7. Optionally, the mother filter element 11 may only include one or more main filter elements 112 installed separately in the composite water filtration channel 7. Optionally, the mother filter element 11 may include at least two filter elements with similar service lives installed in the composite water filtration channel 7 for multiple filtration of the water in the composite water filtration channel 7. Optionally, the pre-filter 111 can be a pre-treatment filter such as a carbon fiber filter, PP cotton filter, activated carbon rod filter, or paper filter. Optionally, the main filter 112 can be a filter with the same function such as a carbon fiber filter, activated carbon filter, ultrafiltration membrane filter, nanofiltration membrane filter, or reverse osmosis filter.

[0058] In this embodiment, the pre-filter 111 and the main filter 112 have similar service lives, which can reach two to three years. The sub-filter 41 uses post-filtration materials to improve taste, such as activated carbon, minerals, or other functional materials, with a service life of generally one year. The pre-filter 111 and the main filter 112 with similar service lives are combined into a mother filter 11 and installed in the outer cylinder 2. The sub-filter 41 is installed separately in the sub-filter bottle 4. When the service life of the sub-filter 41 expires first, the sub-filter bottle 4 is removed separately for replacement. The replacement cost is low and the disassembly and assembly are convenient.

[0059] According to one embodiment of the present invention, the inner cavity of the outer cylinder 2 includes a front cavity 21 and a rear annular cavity 22 formed between the outer cylinder 2 and the inner cylinder 3. The main filter element 112 is installed in the front cavity 21, and the rear annular cavity 22 provides installation space for the pre-filter element 111. By installing the main filter element 112 in the front cavity 21 and utilizing the rear annular cavity 22 to provide installation space for the pre-filter element 111, the inner cavity of the outer cylinder 2 is fully utilized, thereby reducing the volume of the outer cylinder 2.

[0060] In a feasible embodiment, a surrounding plate 23 is provided in the front cavity 21 to separate the front cavity 21 from the rear annular cavity 22, thereby separating the pre-filter 111 in the rear annular cavity 22 and the main filter 112 in the front cavity 21, so that the composite water filtration channel 7 is divided into a first water path 71 and a second water path 72 that are independent of each other, and then different water flows are filtered by the pre-filter 111 and the main filter 112.

[0061] According to one embodiment of the present invention, the composite water filtration channel 7 includes a first water path 71 and a second water path 72 that are independent of each other. The outer cylinder 2 is provided with a first inlet 121 and a first outlet 151 connected to the first water path 71, a second inlet 131 connected to the second water path 72, and a second outlet 17 connecting the second water path 72 and the post-water filtration channel 8. The pre-filter element 111 is located in the first water path 71, and the main filter element 112 is located in the second water path 72. Through the independent water path design, the pre-filter element 111 and the main filter element 112 can filter different water flows.

[0062] like Figure 4 As shown, raw water first enters the first water path 71 through the first inlet 121, and the water filtered by the pre-filter 111 is discharged from the first outlet 151. For example, it can be connected to a booster pump for pressurization. Figure 5 and Figure 6 As shown, the water pressurized by the booster pump enters the second water channel 72 through the second inlet 131, and the water filtered by the main filter element 112 enters the post-filter channel 8 through the second outlet 17. By filtering the raw water through the pre-filter element 111 before sending it into the booster pump, the water quality in the booster pump is improved, which helps to extend the service life of the booster pump.

[0063] Optionally, depending on the water demand, the water filtered by the pre-filter 111 in the first water path 71 can be taken out for use, or the water filtered by the main filter 112 in the second water path 72 can be taken out for use, or the first outlet 151 and the second inlet 131 can be connected by other connecting parts so that the water filtered by the pre-filter 111 in the first water path 71 enters the second water path 72 and undergoes secondary filtration by the main filter 112.

[0064] In this embodiment, as Figures 4-9 As shown, the outer cylinder 2 is provided with a central pipe 6 and a surrounding plate 23. The central pipe 6 passes through the main filter element 112 and the pipe of the central pipe 6 forms a water outlet channel 61. The surrounding plate 23 is located between the inner wall of the outer cylinder 2 and the pipe wall of the central pipe 6, and encloses the main filter element 112. The surrounding plate 23 divides the space between the pipe wall of the central pipe 6 and the inner wall of the outer cylinder 2 into a first water channel 71 and a second water channel 72 that are independent of each other.

[0065] Specifically, the enclosure 23 includes an inner enclosure 231, an outer enclosure 232, and a bottom plate 233. The bottom plate 233 connects the inner enclosure 231 and the outer enclosure 232, so that the inner enclosure 231, the outer enclosure 232, and the bottom plate 233 enclose each other to form a second water channel 72. The inner enclosure 231 is fitted outside the central pipe 6. The main filter element 112 is installed in the second water channel 72. A first bottom limiting annular groove 27 is provided on the top surface of the bottom plate 233. A top cover 25 is installed at the top of the second water channel 72. A first top limiting annular groove 26 is provided at the bottom end of the top cover 25. The main filter element 112 is limited and fixed between the first bottom limiting annular groove 27 and the first top limiting annular groove 26. The first inlet 121 is located at the top of the outer cylinder 2, the first outlet 151 is located at the top of the inner shroud 231, the second inlet 131 is located at the top of the outer shroud 232, and the second outlet 17 is located at the bottom of the bottom plate 233. A second top limiting annular groove 28 is provided on the bottom surface of the bottom plate 233, and a second bottom limiting annular groove 29 is provided on the inner bottom surface of the outer cylinder 2. The pre-filter element 111 is fixed between the second bottom limiting annular groove 29 and the second top limiting annular groove 28. The top of the sub-filter bottle 4 is provided with a third inlet 45 and a third outlet 46 that communicate with the rear water filtration channel 8. The third inlet 45 communicates with the second outlet 17, and the third outlet 46 communicates with the water outlet channel 61 inside the outer cylinder 2.

[0066] In another feasible embodiment, such as Figures 4-8 As shown, the front cavity 21 is connected to the rear annular cavity 22; the pre-filter element 111 is installed in the rear annular cavity 22. By installing the main filter element 112 separately in the front cavity 21 and the pre-filter element 111 separately in the rear annular cavity 22, the inner cavity space of the outer cylinder 2 is fully utilized.

[0067] In another feasible embodiment, such as Figures 10-12As shown, the pre-filter 111 is installed in the rear annular cavity 22. By installing the main filter 112 separately in the front cavity 21 and the pre-filter 111 separately in the rear annular cavity 22, the inner cavity of the outer cylinder 2 is fully utilized. The pre-filter 111 in the rear annular cavity 22 and the main filter 112 in the front cavity 21 are not separated. The rear annular cavity 22 and the front cavity 21 are connected to form a composite water filtration channel 7. The outer side of the main filter 112 is covered with a diaphragm to prevent water from the front cavity 21 from entering the main filter 112 from the outer side. The water first enters the rear annular cavity 22 through the gap between the diaphragm and the outer cylinder 2, undergoes the first filtration through the pre-filter 111, and then enters the main filter 112 from the bottom end for the second filtration.

[0068] like Figures 10-12 As shown, specifically, a limiting plate 24 is installed between the front cavity 21 and the rear annular cavity 22. A top cover 25 is installed at the top of the front cavity 21. A first top limiting annular groove 26 is provided at the bottom of the top cover 25. A first bottom limiting annular groove 241 is provided on the top surface of the limiting plate 24. The main filter element 112 is limited and fixed between the first top limiting annular groove 26 and the first bottom limiting annular groove 241. A second top limiting annular groove 28 is provided on the bottom surface of the limiting plate 24. A second bottom limiting annular groove 29 is provided on the inner bottom surface of the outer cylinder 2. The second bottom limiting annular groove 29 is located at the bottom of the rear annular cavity 22. The front filter element 111 is limited and fixed between the second top limiting annular groove 28 and the second bottom limiting annular groove 29.

[0069] In another feasible embodiment, such as Figures 13-15 As shown, a portion of the pre-filter element 111 is fitted over the main filter element 112, while another portion extends into the rear annular cavity 22. This fully utilizes the inner cavity of the outer cylinder 2 and increases the axial length of the pre-filter element 111, thereby increasing the contact area between the pre-filter element 111 and the water flow and improving filtration efficiency. The water first undergoes a first filtration through the outer pre-filter element 111 and then a second filtration through the inner main filter element 112.

[0070] Specifically, a top cover 25 is installed at the top of the front cavity 21, and a first top limiting annular groove 26 is provided at the bottom of the top cover 25. A first bottom limiting annular groove 27' and a second bottom limiting annular groove 29 are provided on the inner bottom surface of the outer cylinder 2. The first bottom limiting annular groove 27' is located at the bottom of the front annular cavity, and the second bottom limiting annular groove 29 is located at the bottom of the rear annular cavity 22. The main filter element 112 is limited and fixed between the first top limiting annular groove 26 and the first bottom limiting annular groove 27'. A limiting plate 24' is sleeved on the upper part of the main filter element 112, and a second top limiting annular groove 28' is provided on the bottom surface of the limiting plate 24'. The pre-filter element 111 is limited and fixed between the second top limiting annular groove 28' and the second bottom limiting annular groove 29.

[0071] According to one embodiment of the present invention, such as Figures 10-15 As shown, the composite water filtration channel 7 includes a first water path 71. A pre-filter element 111 and a main filter element 112 are installed in the first water path 71 along the water flow direction. The outer cylinder 2 is provided with a first inlet 121 connected to the first water path 71, and a first outlet 151' connected to both the first water path 71 and the rear water filtration channel 8. Installing the pre-filter element 111 and the main filter element 112 in the same water path results in a simple water path structure and high filtration efficiency.

[0072] After being pressurized by a booster pump, the raw water enters the first water channel 71 through the first inlet 121. After undergoing dual filtration through the pre-filter 111 and the main filter 112, it flows into the post-filter channel 8 through the first outlet 151'. The water entering the pre-filter 111 is pressurized water, so the filtration speed is fast and the filtration efficiency is high.

[0073] Specifically, such as Figure 11 , Figure 12 and Figure 14 , Figure 15 As shown, the first inlet 121 is located at the top of the outer cylinder 2, the first outlet 151' is located at the bottom of the inner cylinder 3, and the top of the sub-filter bottle 4 is provided with a third inlet 45 and a third outlet 46 that are connected to the rear water filtration channel 8. The third inlet 45 is connected to the first outlet 151', and the third outlet 46 is connected to the water outlet channel 61 inside the outer cylinder 2.

[0074] According to one embodiment of the present invention, such as Figure 8 , Figure 11 as well as Figure 14 As shown, the outer cylinder 2 is provided with a wastewater outlet 141 that communicates with the composite water filtration channel 7. The wastewater outlet 141 discharges water that cannot be filtered by the mother filter element 11 in the composite water filtration channel 7 and / or water used to rinse the mother filter element 11, thereby improving the service life of the mother filter element 11.

[0075] Specifically, such as Figure 7 As shown, the main filter element 112 is a reverse osmosis filter element. The wastewater outlet 141 is located at the top of the mother filter bottle 1. After the water flow is pressurized by the booster pump, part of it passes through the reverse osmosis filter element, and part of it cannot pass through the reverse osmosis filter element and is discharged from the wastewater outlet 141. In addition, as the impurities in the water flow in the composite water filtration channel 7 continuously increase, in order to avoid impurities from depositing on the surface of the reverse osmosis filter element and causing blockage, the reverse osmosis filter element is periodically flushed. That is, the composite water filtration channel 7 is opened and the outlet channel 61 is closed, so that the water flow enters the composite water filtration channel 7 to flush the reverse osmosis filter element, and then is discharged from the wastewater outlet 141.

[0076] Specifically, the wastewater outlet 141 is located on the wastewater outlet connector 14, which is located at the top of the top cover 25.

[0077] According to one embodiment of the present invention, such as Figure 2 , Figure 3 as well as Figure 16 As shown, the sub-filter bottle 4 is connected to the inner cylinder 3 via a detachable connection structure 9. This ensures that the sub-filter bottle 4 is securely installed and is easy to install and remove.

[0078] In this embodiment, as Figures 2-3 As shown, the detachable connection structure 9 includes a first snap-fit ​​boss 42, a first snap-fit ​​groove 31, and a positioning port 32; the first snap-fit ​​boss 42 is provided on the sub-filter bottle 4, the first snap-fit ​​groove 31 is provided on the inner wall surface of the inner cylinder 3, and the positioning port 32 is provided at the cylinder opening of the inner cylinder 3 and communicates with the first snap-fit ​​groove 31, so that the first snap-fit ​​boss 42 can be snapped into the first snap-fit ​​groove 31. When installing the sub-filter bottle 4, align the first snap-fit ​​protrusion 42 with the positioning port 32, then insert the sub-filter bottle 4 into the inner cylinder 3, allowing the first snap-fit ​​protrusion 42 to enter the first snap-fit ​​groove 31 from the positioning port 32. Then, rotate the sub-filter bottle 4 circumferentially so that the first snap-fit ​​protrusion 42 engages in the first snap-fit ​​groove and is completely or partially offset from the positioning port 32. When removing the sub-filter bottle 4, rotate the sub-filter bottle 4 circumferentially so that the first snap-fit ​​protrusion 42 slides along the first snap-fit ​​groove 31 until it aligns with the positioning port 32, then pull the sub-filter bottle 4 out of the inner cylinder 3. Optionally, the first snap-fit ​​protrusion 42 is located on the inner wall of the inner cylinder 3, the first snap-fit ​​groove 31 is located on the sub-filter bottle 4, and the positioning port 32 is located on the sub-filter bottle 4 and communicates with the first snap-fit ​​groove 31, allowing the first snap-fit ​​protrusion 42 to engage in the first snap-fit ​​groove 31.

[0079] In another embodiment, such as Figure 16As shown, the disassembly and assembly connection structure 9 includes a frame 91, a first snap-fit ​​part 92, and a boss 93. The first snap-fit ​​part 92 and the boss 93 are provided on the outer wall surface of the sub-filter bottle 4, and the first snap-fit ​​part 92 is located inside the boss 93. The frame 91 is provided at the bottom end of the mother filter bottle 1. The frame 91 includes a housing 911, a slider 912, and an elastic member 913. The elastic member 913 abuts between the housing 911 and the slider 912. The slider 912 is provided with a groove 95 that mates with the boss 93 and a second snap-fit ​​part 94 located inside the groove 95. The first snap-fit ​​part 92 is snapped and fixed inside the second snap-fit ​​part 94. When installing the sub-filter bottle 4, press the sub-filter bottle 4 into the inner cylinder 3. The slider 912 slides to both sides under the pressure of the sub-filter bottle 4, so that the first locking part 92 on the sub-filter bottle 4 is locked and fixed inside the second locking part 94, and the boss 93 is locked into the groove 95. At the same time, the elastic restoring force of the elastic element 913 presses the slider 912 inward, thereby locking the sub-filter bottle 4. When removing the sub-filter bottle 4, pull the sub-filter bottle 4 out of the inner cylinder 3. The slider 912 slides to both sides under the pressure of the sub-filter bottle 4, so that the first locking part 92 on the sub-filter bottle 4 disengages from the second locking part 94 on the slider 912, and the boss 93 disengages from the groove 95, thereby pulling the sub-filter bottle 4 out of the inner cylinder 3.

[0080] According to one embodiment of the present invention, such as Figure 3 As shown, the sub-filter bottle 4 includes an inner insert 43 and a handle 44. The inner insert 43 is inserted into the inner cylinder 3, and the handle 44 is engaged at the opening of the inner cylinder 3. The handle 44 is provided by the disassembly and assembly connection structure 9, which facilitates the disassembly and assembly of the sub-filter bottle 4.

[0081] Specifically, a first engaging protrusion 42 is provided on the handle portion 44, a positioning port 32 is provided at the opening of the inner cylinder 3, and a first engaging groove 31 is provided inside the positioning port 32. By operating the handle portion 44, the first engaging protrusion 42 is engaged into the first engaging groove 31.

[0082] According to one embodiment of the present invention, such as Figure 5 , Figure 10 as well as Figure 12 As shown, the mother filter bottle 1 is connected to the whole water purifier through the connector 5. The connector 5 is provided with a second snap-fit ​​groove 51. The mother filter bottle 1 is provided with a second snap-fit ​​boss 16 that mates with the second snap-fit ​​groove 51. The circumferential mating surfaces of the second snap-fit ​​groove 51 and the second snap-fit ​​boss 16 are provided with mating protrusions and grooves.

[0083] Specifically, the open end of the mother filter bottle 1 is provided with at least one of the following: a first water inlet connector 12, a second water inlet connector 13, a first water outlet connector 15, a wastewater outlet connector 14, and an output connector 63 of the central tube 6. The first water inlet connector 12 is provided with a first water inlet 121, the second water inlet connector 13 is provided with a second water inlet 131, the first water outlet connector 15 is provided with a first water outlet 151, and the wastewater outlet connector 14 is provided with a wastewater outlet 141. The connector 5 is provided with limiting grooves 52 that respectively match the first water inlet connector 12, the second water inlet connector 13, the wastewater outlet connector 14, the first water outlet connector 15, and / or the output connector 63 of the central tube 6, thereby limiting and fixing the first water inlet connector 12, the second water inlet connector 13, the wastewater outlet connector 14, the first water outlet connector 15, and / or the output connector 63 of the central tube 6.

[0084] In this embodiment, as Figure 8 As shown, the opening end of the mother filter bottle 1 is provided with a first water inlet connector 12, a second water inlet connector 13, a wastewater outlet connector 14, a first water outlet connector 15, and an output connector 63 of the central tube 6 from the outside to the inside. The connector 5 is provided with limiting grooves 52 from the outside to the inside, corresponding to the first water inlet connector 12, the second water inlet connector 13, the wastewater outlet connector 14, the first water outlet connector 15, and the output end of the central tube 6. Through the limiting function of the connector 5, it is ensured that the first water inlet connector 12 is connected to the corresponding water inlet pipe and the first water path 71 in the water purifier, the second water inlet connector 13 is connected to the corresponding water inlet pipe and the second water path 72 in the water purifier, the wastewater outlet connector 14 is connected to the corresponding drain pipe and the second water path 72 in the water purifier, the first water outlet connector 15 is connected to the corresponding drain pipe and the first water path 71 in the water purifier, and the output end of the central tube 6 is connected to the corresponding water outlet pipe in the water purifier.

[0085] In another embodiment, such as Figure 11 and Figure 14 As shown, the opening end of the mother filter bottle 1 is provided with a first water inlet connector 12, a wastewater outlet connector 14, and the output end of the central tube 6 from the outside to the inside. The connector 5 is provided with limiting grooves 52 from the outside to the inside, corresponding to the first water inlet connector 12, the wastewater outlet connector 14, and the output end of the central tube 6. Through the limiting function of the connector 5, it is ensured that the first water inlet connector 12 is connected to the corresponding water inlet pipe and the first water passage 71 in the water purifier, the wastewater outlet connector 14 is connected to the corresponding drain pipe and the first water passage 71 in the water purifier, and the central tube 6 is connected to the corresponding water outlet pipe in the water purifier.

[0086] Implementation Method 2

[0087] This invention also provides a water purifier, including the aforementioned mother-daughter composite filter element. Its structure, working principle, and beneficial effects are the same as those of the mother-daughter composite filter element described in Embodiment 1, and will not be repeated here. The outer cylinder 2 of the mother-daughter composite filter element is connected to the main unit connection port of the water purifier. Raw water is discharged from the main unit connection port and enters the composite water filtration channel 7 in the outer cylinder 2 for filtration. Because this water purifier uses the aforementioned mother-daughter composite filter element, it reduces filter replacement costs, eliminates the need for frequent disassembly and reassembly of the mother-daughter composite filter element to the main unit connection port, avoids leakage caused by frequent disassembly and reassembly, and is convenient for users.

[0088] The above descriptions are merely a few embodiments of the present invention. Those skilled in the art can make various modifications or variations to the embodiments of the present invention based on the content disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A mother-daughter composite filter element, characterized in that, include: A mother filter bottle includes an outer cylinder, which has an independent composite water filtration channel and an outlet channel. The composite water filtration channel contains a mother filter element, and the wall of the outer cylinder is recessed inward to form an inner cylinder. The mother filter element includes a pre-filter element and a main filter element, which are sequentially installed in the composite water filtration channel along the water flow direction; The sub-filter bottle is replaceably installed in the inner cylinder. The sub-filter bottle is provided with a post-filtration channel. The post-filtration channel is provided with a sub-filter element. The composite filtration channel and the outlet channel are connected through the post-filtration channel. The composite water filtration channel includes a first water path and a second water path that are independent of each other. The outer cylinder is provided with a first water inlet and a first water outlet connected to the first water path, a second water inlet connected to the second water path, and a second water outlet connecting the second water path and the post-water filtration channel. The pre-filter element is located in the first water path, and the main filter element is located in the second water path. The water flow filtered by the pre-filter is discharged from the first outlet to the booster pump, so that the water flow pressurized by the booster pump enters the second water path from the second inlet. The water flow in the second water path is filtered by the main filter and then enters the post-filter channel from the second outlet. The inner cavity of the outer cylinder includes a front cavity and a rear annular cavity formed between the outer cylinder and the inner cylinder. The main filter element is installed in the front cavity, and the rear annular cavity is used to provide installation space for the pre-filter element.

2. The mother-daughter composite filter element according to claim 1, characterized in that, The pre-filter is installed in the rear annular cavity.

3. The mother-daughter composite filter element according to claim 1, characterized in that, A portion of the pre-filter is fitted over the main filter, and another portion of the pre-filter extends into the rear annular cavity.

4. The mother-daughter composite filter element according to claim 1, characterized in that, The outer cylinder is provided with a central pipe and a surrounding plate. The central pipe passes through the main filter element and forms the water outlet channel. The surrounding plate is located between the inner wall of the outer cylinder and the pipe wall of the central pipe, and encloses the main filter element. The surrounding plate divides the space between the pipe wall of the central pipe and the inner wall of the outer cylinder into two independent water channels: the first water channel and the second water channel.

5. The mother-daughter composite filter element according to claim 1, characterized in that, The outer cylinder is provided with a wastewater outlet that communicates with the composite water filtration channel.

6. The mother-daughter composite filter element according to claim 1, characterized in that, The sub-filter bottle is connected to the inner cylinder via a detachable structure.

7. The mother-daughter composite filter element according to claim 6, characterized in that, The detachable structure includes a first snap-fit ​​boss, a first snap-fit ​​groove, and a positioning port; The first snap-fit ​​protrusion is provided on the sub-filter bottle, the first snap-fit ​​groove is provided on the inner wall surface of the inner cylinder, and the positioning port is provided at the cylinder opening of the inner cylinder and communicates with the first snap-fit ​​groove, for the first snap-fit ​​protrusion to snap into the first snap-fit ​​groove; or The first snap-fit ​​protrusion is provided on the inner wall surface of the inner cylinder, the first snap-fit ​​groove is provided on the sub-filter bottle, and the positioning port is provided on the sub-filter bottle and communicates with the first snap-fit ​​groove, for the first snap-fit ​​protrusion to snap into the first snap-fit ​​groove.

8. The mother-daughter composite filter element according to claim 1, characterized in that, The sub-filter bottle includes an inner insert and a handle. The inner insert is inserted into the inner cylinder, and the handle is engaged at the opening of the inner cylinder.

9. The mother-daughter composite filter element according to claim 1, characterized in that, The mother filter bottle is connected to the water purifier via a connector. The connector has a second snap-fit ​​groove, and the mother filter bottle has a second snap-fit ​​boss that mates with the second snap-fit ​​groove. The circumferential mating surfaces of the second snap-fit ​​groove and the second snap-fit ​​boss have mating teeth and grooves.

10. A water purifier, characterized in that, Includes the mother-daughter composite filter element as described in any one of claims 1-9.

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