Composite filter element structure with hand-washable outer filter element and replaceable inner filter element

Abstract

The utility model provides a composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element, which comprises an outer filter element and an inner filter element, the outer filter element is sleeved outside the inner filter element, and the outer filter element and the inner filter element are coaxially arranged; the outer filter element at least comprises an outer filter element material and an outer filter element upper end cover; the outer surface of the core material of the outer filter element can be manually cleaned for multiple times, an opening is formed in the center of an upper end cover of the outer filter element, and the inner filter element can be integrally and freely inserted into or taken out of the opening for replacement; the inner wall of the opening and the outer wall of the matched end of the inner filter element form a sealed connection structure; a purified water outlet is formed in one end of the inner filter element and penetrates through one end of the outer filter element; according to the composite filter element structure, the outer filter element can be manually cleaned and reused for multiple times, and the inner filter element can be freely replaced and cleaned, so that the use cost of the composite filter element is greatly reduced, the common problem that a traditional water purifier is affordable and cannot be used is solved, and the composite filter element structure has great social benefits and economic benefits.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a composite filter element structure with an outer filter element that can be washed by hand and an inner filter element that can be replaced. Background Art

[0002] The composite filter elements of traditional water purifiers mainly include the following types and the shortcomings of each type:

[0003] 1. The traditional melt-blown polypropylene carbon rod composite filter element is mainly composed of: the front is a melt-blown polypropylene composite filter element, and the rear is a carbon rod filter element. After the filter bottle and the front and rear composite filter elements are assembled, the bottom cover and the filter bottle are spun and melted. The front filter element (or outer filter element) and the rear filter element (or inner filter element) cannot be disassembled. The two are completely fixedly connected, which makes the rear filter element unable to be replaced separately. The outer layer of the front filter element is covered by the filter bottle, and the outer surface of the filter element core material cannot be cleaned. Moreover, the replacement cycle of the front and rear composite filter elements is generally 3-6 months. Due to the diversity and complexity of tap water quality in various places, the front filter element and the rear filter element cannot fail at the same time. In this way, the service life of the overall composite filter element is usually determined by the short-lived internal carbon rod filter element. Therefore, discarding the front filter element and the rear filter element at the same time leads to insufficient utilization of the filter element, resulting in unnecessary waste. When replacing the filter element, the entire filter element needs to be discarded, and the cost of replacing the element is very high.

[0004] 2. The main components of the traditional ceramic carbon rod composite filter element are: the outer filter element is a ceramic filter element fired at high temperature with diatomaceous earth, and the inner filter element is a carbon rod filter element sintered at high temperature with activated carbon. The two are fixed as a whole and the inner filter element cannot be replaced separately. Although the ceramic filter element of the outer filter element can be cleaned repeatedly, so that its service life can generally reach two to three years, and the service life of the internal carbon rod filter element is usually about six months, the difference in service life between the two is very large. In this way, the service life of the overall composite filter element is usually determined by the short-lived internal carbon rod filter element. Therefore, discarding the outer ceramic filter element and the internal carbon rod filter element at the same time leads to the composite filter element not being fully utilized, causing unnecessary waste, and when replacing the filter element, the entire filter element is generally discarded, and the cost of replacing the element is very high.

[0005] After searching the patent literature, the patent with the announcement number CN216155633U discloses a composite filter element structure. This patent technology obviously provides a solution to the problem of replacing the post-filter element (or inner filter element). At the same time, the dependent claims of the patent also propose a solution for cleaning the core material of the pre-filter element (or outer filter element). However, after careful study, this cleaning solution for the pre-filter element (or outer filter element) is technically invalid. In order to more clearly explain why this technical solution is invalid, here, a paragraph is specially selected from the embodiment in the patent document (paragraph number 0049) and combined with the relevant specification drawings in the patent document to briefly explain it: "The filter bottle 1 is close to the filter element end cover 21 (also known as In other words, a wastewater outlet pipe 15 is also provided at one end close to the carbon rod end cap 31, and a wastewater outlet port 151 is provided on the wastewater outlet pipe 15. The pre-filter element assembly 2 has a third end 213 that matches the wastewater outlet pipe 15, and the wastewater outlet pipe 15 is sealed and connected to the third end 213 to form a wastewater outlet pipeline. Specifically, the third end 213 is in the shape of a convex ring, and the inner hole of the convex ring is aligned with and connected to the other end of the membrane filament 232 of the filter element 23. In this embodiment, the membrane filament 232 is aligned with the first end 211 and the third end. The two ends of the first end 213 are connected to form a wastewater flow channel. When flushing the composite filter element structure, tap water enters the raw water inlet pipe 11 from the raw water inlet port 111, and then enters the membrane filament 232 of the pre-filter element assembly 2, passes through the wastewater flow channel in the membrane filament 232, enters the wastewater outlet pipe 15, and finally flows out of the composite filter element structure through the wastewater outlet port 151, completing the flushing of the pre-filter element assembly 2. "From this text and the drawings in the patent document, it can be seen that the first end 211 and the third end 213 are simultaneously arranged on the filter element end cover. 21, and all penetrate the inner space formed by the open end of the membrane filament 232 and the inner end of the filter element end cap 21. Obviously, the first end 211 and the third end 213 form a direct connection through this shared inner space. The raw water entering the inner space from the water inlet pipe 11 (sealed with the first end 211) directly flows out of the composite filter element from the wastewater outlet 151 (sealed with the third end 213). The raw water does not pass through the wastewater flow channel in the membrane filament 232 at all, that is, it is impossible to complete the flushing of the pre-filter element assembly 2. Therefore, a composite filter element structure disclosed in the patent document with announcement number CN216155633U actually only solves the technical problem of replacing the post-filter element (or the inner filter element). As for the cleaning solution of the pre-filter element (or the outer filter element) provided by the patent, it is not technically valid.

[0006] In addition, the patent with announcement number CN216155633U discloses a composite filter element structure, which is complex in structure and difficult to manufacture. Summary of the invention

[0007] In order to solve the problems in the background technology, the utility model provides a composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced.

[0008] The specific technical solutions are as follows:

[0009] The utility model provides a composite filter element structure in which an outer filter element can be washed by hand and an inner filter element can be replaced, comprising: an outer filter element and an inner filter element, wherein the outer filter element is sleeved outside the inner filter element, and the two are coaxially arranged; the outer filter element at least comprises an outer filter element core material and an outer filter element upper end cover, the outer surface of the outer filter element core material can be manually washed many times, an opening is arranged at the center of the outer filter element upper end cover, and the inner filter element can be freely inserted or taken out and replaced as a whole from the opening; the inner wall of the opening and the outer wall of one end of the inner filter element cooperate to form a sealing connection The inner filter element has a connection structure; a clean water outlet is provided at one end of the inner filter element and the clean water outlet passes through one end of the outer filter element; the inner cavity preset between the inner wall of the outer filter element and the outer wall of the inner filter element is the first flow channel for water flow, the inner filter element is hollow inside to form a second flow channel for water flow, the clean water outlet is connected to the second flow channel, the raw water flows horizontally from the outer wall of the outer filter element into the first flow channel after being filtered, and then flows horizontally from the outer wall of the inner filter element into the second flow channel after being filtered, and then flows out from the clean water outlet.

[0010] The above-mentioned composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced also has the following characteristics: the outer filter element includes an outer filter element core material, an outer filter element frame, and an outer filter element upper end cover, and the opening is arranged on the outer filter element upper end cover; the outer filter element core material is fixed on the outer filter element frame, and the outer filter element core material is formed by a bundle of several hollow fiber membrane fibers, and each of the hollow fiber membrane fibers is in the shape of a capillary as a whole, and the port at one end is in a blocked shape, while the other end remains open; the outer filter element frame includes an outer ring, a guide tube, and a guide tube end cover, and the three are coaxially arranged; the outer ring is sleeved on the guide tube The upper port is coaxially arranged and the upper ports are flush with each other, the end cover of the flow guide tube is fixedly connected to the lower port of the flow guide tube; an annular cavity is formed between the inner wall of the outer ring and the outer wall of the upper end of the flow guide tube, and all the open ends of the hollow fiber membrane threads are bundled and accommodated in the annular cavity, and the remaining gaps in the annular cavity are filled with adhesive, and all the open ends of the hollow fiber membrane threads fixed by the adhesive are flush with the outer ring and the upper port of the flow guide tube, and it is ensured that the open end of each of the hollow fiber membrane threads is not blocked by foreign matter, and the part of each of the hollow fiber membrane threads away from its open end can be The filter element is free to swing; the upper end cover of the outer filter element and the outer ring form a fixed sealing connection, and ensure that there is a sufficient inner flow channel for water to flow through between the open end of the hollow fiber membrane, the upper port of the guide tube and the inner bottom surface of the upper end cover of the outer filter element, and the inner flow channel is one of the components of the first flow channel; the inner filter element comprises an upper end cover of the inner filter element, an inner filter element core material, and a lower end cover of the inner filter element; the outer diameter of the upper end cover of the inner filter element is greater than or equal to the outer diameter of the lower end cover of the inner filter element, and the outer diameter of the lower end cover of the inner filter element is smaller than the inner diameter of the guide tube; the inner filter element core material is hollow tubular as a whole and its upper end is mounted on the inner filter The core is in the upper end cover, and its lower end is installed in the lower end cover of the inner filter element. The clean water outlet is arranged on the upper end cover of the inner filter element or the lower end cover of the inner filter element. A sealing connection is formed by arranging a plurality of O-ring sealing structures on the outer side wall of the upper end cover of the inner filter element and the inner wall of the open port. The raw water enters the interior of the hollow fiber membrane filament transversely through the direction of intersection of the axis of the hollow fiber membrane filament by external pressure, and then enters the inner flow channel from its open end after being filtered through the membrane filament wall of each hollow fiber membrane filament, and then converges into the first flow channel, and then enters the second flow channel after being filtered through the core material of the inner filter element, and then flows out the clean water from the clean water outlet. Usually, the hollow fiber membrane filament is a lining-reinforced PVDF membrane filament, and its filtration pore size is between 0.001μm and 0.2μm, wherein the inner diameter of the membrane filament is between 0.7 and 1.5mm, and the outer diameter of the membrane filament is between 1.4 and 2.8mm.

[0011] The above-mentioned composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced also has such a feature that the clean water outlet is arranged on the axis of the lower end cover of the inner filter element, and correspondingly, a clean water diversion port matching the clean water outlet is arranged on the axis of the end cover of the guide pipe, and the outer end face of the lower end cover of the inner filter element and the inner end face of the end cover of the guide pipe form a sealing connection to prevent the water in the first flow channel from leaking from this connection. Usually, a spare outlet is also arranged on the axis of the upper end cover of the inner filter element.

[0012] The above-mentioned composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced also has the following characteristics: the clean water outlet is arranged on the axis of the upper end cover of the inner filter element, the lower end cover of the inner filter element is in the shape of a bottle cap as a whole and is used to seal the lower port of the inner filter element core material, and the end cover of the guide tube is in the shape of a bottle cap as a whole and is used to seal the lower port of the guide tube.

[0013] The above-mentioned composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced also has such a feature that the outer end surface of the lower end cover of the inner filter element is provided with an annular convex rib, the inner end surface of the end cover of the guide tube is provided with an annular groove, a sealing flat gasket is provided in the groove, and the annular convex rib and the sealing flat gasket are in close contact to form a sealed connection structure. Usually, another annular groove is provided on the outer end surface of the end cover of the guide tube, and a sealing flat gasket is also provided in the annular groove.

[0014] The above-mentioned composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced also has the feature that the guide tube and the guide tube end cover are an integral structure.

[0015] The above-mentioned composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced also has the following characteristics: the outer filter element comprises an outer filter element core material and an outer filter element upper end cover, and the opening is arranged on the outer filter element upper end cover; the outer filter element core material is a high-temperature sintered ceramic filter element, which is cylindrical as a whole, with one end being open and the other end being a closed semicircular head; the inner filter element comprises an inner filter element upper end cover, an inner filter element core material, and an inner filter element lower end cover; the outer diameter of the inner filter element upper end cover is greater than or equal to the outer diameter of the inner filter element lower end cover, the inner filter element core material is hollow tubular as a whole and is equipped with a In the upper end cover of the inner filter element, its lower end is installed in the lower end cover of the inner filter element; the clean water outlet is arranged on the upper end cover of the inner filter element, and a sealed connection is formed by arranging a plurality of O-ring sealing structures on the outer side wall of the upper end cover of the inner filter element and the open inner wall, and the lower end cover of the inner filter element is in the shape of a bottle cap as a whole to seal the lower port of the inner filter element core material; the raw water is filtered through the outer wall of the outer filter element core material by external pressure and then enters the first flow channel laterally, and then enters the second flow channel laterally after being filtered from the outer side wall of the inner filter element core material, and then flows out the clean water from the clean water outlet.

[0016] The above-mentioned composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced also has the following characteristics: the outer filter element comprises an outer filter element core material, an outer filter element upper end cover and an outer filter element lower end cover, and the opening is arranged on the outer filter element upper end cover; the outer filter element core material is a high-temperature sintered ceramic filter element, which is in the shape of a circular tube as a whole, and its upper end is installed in the outer filter element upper end cover, and its lower end is installed in the outer filter element lower end cover; the inner filter element comprises an inner filter element upper end cover, an inner filter element core material and an inner filter element lower end cover; the outer diameter of the inner filter element upper end cover is greater than or equal to the outer diameter of the inner filter element lower end cover, and the inner filter element core material is in the shape of a hollow tube as a whole and its upper end is installed in the The lower end of the inner filter element is installed in the lower end cover of the inner filter element; the clean water outlet is arranged on the upper end cover of the inner filter element, and a sealed connection is formed by arranging a plurality of O-ring sealing structures on the outer side wall of the upper end cover of the inner filter element and the open inner wall. The lower end cover of the inner filter element is in the shape of a bottle cap as a whole and is used to seal the lower port of the inner filter element core material, and the lower end cover of the outer filter element is in the shape of a bottle cap as a whole and is used to seal the lower port of the outer filter element core material; the raw water enters the first flow channel laterally through the outer wall of the outer filter element core material through external pressure, and then enters the second flow channel laterally after being filtered from the outer side wall of the inner filter element core material, and then flows out the clean water from the clean water outlet.

[0017] The above-mentioned composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced also has the following characteristics: the outer filter element comprises an outer filter element core material, an outer filter element upper end cover and an outer filter element lower end cover, and the opening is arranged on the outer filter element upper end cover; the outer filter element core material is a high-temperature sintered ceramic filter element, which is in the shape of a circular tube as a whole, and its upper end is mounted in the outer filter element upper end cover, and its lower end is mounted in the outer filter element lower end cover; the inner filter element comprises an inner filter element upper end cover, an inner filter element core material and an inner filter element lower end cover; the outer diameter of the inner filter element upper end cover is greater than or equal to the outer diameter of the inner filter element lower end cover, the inner filter element core material is in the shape of a hollow tube as a whole, and its upper end is mounted in the inner filter element upper end cover, and its lower end is mounted in the In the lower end cover of the inner filter, a sealing connection is formed by arranging a plurality of O-ring sealing structures on the outer side wall of the upper end cover of the inner filter and the inner wall of the opening, the clean water outlet is arranged on the axis of the lower end cover of the inner filter, and correspondingly, a clean water guide port matching the clean water outlet is arranged on the axis of the lower end cover of the outer filter, and the outer end face of the lower end cover of the inner filter and the inner end face of the lower end cover of the outer filter form a sealing connection to prevent the water in the first flow channel from leaking from this connection; the raw water enters the first flow channel laterally through the outer wall of the outer filter core material by external pressure, and then enters the second flow channel laterally after being filtered from the outer side wall of the inner filter core material, and then the clean water flows out from the clean water outlet. Usually, a spare outlet is also arranged on the axis of the upper end cover of the inner filter.

[0018] The above-mentioned composite filter element structure in which the outer filter element can be washed by hand and the inner filter element can be replaced also has such a feature that the inner filter element core material is made of activated carbon material and includes at least one of the following: carbon particles, carbon fibers and carbon rods. Usually, the inner filter element is a carbon rod filter element sintered by activated carbon at high temperature, and active silver ions are arranged on its outer surface layer, and ATS ion exchange resin or scale inhibitor is arranged on its inner surface layer. Active silver ions have the effect of preventing bacterial reproduction, while ATS ion exchange resin can effectively adsorb various harmful heavy metal elements, and scale inhibitor can effectively reduce scaling inside the filter element.

[0019] The positive effects of the above technical solution are:

[0020] The utility model provides a composite filter element structure, in which not only the outer filter element can be manually cleaned and reused many times, but also the inner filter element can be freely replaced and cleaned, which greatly reduces the use cost of the composite filter element. At the same time, the composite filter element is not only simple and compact in structure, but also easy to manufacture and low in cost. It solves the common problem of traditional water purifiers that are affordable to buy but unaffordable to use, and has great social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] The serial numbers of the components in this article, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "fixed connection" mentioned in this application, unless otherwise specified, include direct and indirect connections. In the description of the present utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model 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 utility model. In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor. The drawings are only provided for reference and explanation, and are not used to limit the present utility model.

[0023] Figure 1 This is a structural schematic diagram of a composite filter element provided by the utility model;

[0024] Figure 2 This is a structural schematic diagram of an outer filter element provided by the utility model;

[0025] Figure 3 This is a structural schematic diagram of an inner filter element provided by the utility model;

[0026] Figure 4 This is a schematic diagram of an outer filter structure in which a guide tube and a guide tube end cover are integrated into one body provided by the utility model;

[0027] Figure 5 It is a structural schematic diagram of another composite filter element provided by the utility model;

[0028] Figure 6 It is a structural schematic diagram of another outer filter element provided by the utility model;

[0029] Figure 7 It is a structural schematic diagram of another inner filter element provided by the utility model;

[0030] Figure 8 This is a structural schematic diagram of a composite filter element provided by the utility model, the outer filter element of which is made of ceramic core material;

[0031] Fig. 9 This is a structural schematic diagram of an outer filter element provided by the utility model, the core material of which is ceramic;

[0032] Fig.10 This is a schematic diagram of the structure of another composite filter element provided by the utility model, in which the outer filter element is made of ceramic;

[0033] Fig.11 This is a schematic structural diagram of another type of outer filter element provided by the utility model, the core material of which is ceramic;

[0034] Fig.12 This is a schematic diagram of the structure of another composite filter element provided by the utility model, in which the outer filter element is made of ceramic;

[0035] Fig.13 It is a structural schematic diagram of another outer filter element provided by the utility model, the core material of which is ceramic.

[0036] The reference numerals are as follows:

[0037] Outer filter element 1, outer filter element core material 10, outer filter element frame 11, outer filter element upper end cover 12, outer filter element lower end cover 13, opening 14, hollow fiber membrane 100, outer ring 101, flow guide tube 102, flow guide tube end cover 103, inner filter element 2, inner filter element upper end cover 20, inner filter element core material 21, inner filter element lower end cover 22, O-ring sealing structure 23, annular rib 220, clean water outlet 3, clean water diversion port 30, spare outlet 31, first flow channel 4, second flow channel 5, annular cavity 6, inner flow channel 7, annular groove 8, sealing flat gasket 9. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Example

[0039] like Figure 1 , Figure 2 As shown, the composite filter element includes an outer filter element 1 and an inner filter element 2, the outer filter element 1 is sleeved outside the inner filter element 2, and the two are coaxially arranged; the outer filter element 1 includes an outer filter element core material 10, an outer filter element skeleton 11, and an outer filter element upper end cover 12, an opening 14 is arranged on the outer filter element upper end cover 12, and the inner filter element 2 can be freely inserted or removed and replaced from the opening 14 as a whole; wherein, the outer filter element core material 10 is fixed on the outer filter element skeleton 11; the outer filter element core material 10 is formed by a bundle of a plurality of hollow fiber membrane filaments 100, each hollow fiber membrane filament 100 is in a capillary shape as a whole, the port at one end thereof is in a blocked shape, and the other end remains open; the outer filter element skeleton 11 includes an outer ring 101, a guide tube 102, and a guide tube end cover 103, and the three are coaxially arranged; the outer ring 101 is sleeved on the upper port of the guide tube 102, and the two are coaxial The two upper ends are arranged to be flush; the end cover 103 of the guide tube is fixedly connected to the lower end of the guide tube 102; an annular cavity 6 is formed between the inner wall of the outer ring 101 and the outer wall of the upper end of the guide tube 102, and the open ends of all the hollow fiber membrane threads 100 are bundled and received in the annular cavity 6, and the remaining gaps in the annular cavity 6 are filled with adhesive, and all the open ends of the hollow fiber membrane threads 100 fixed by the adhesive are flush with the upper ends of the outer ring 101 and the guide tube 102, and it is ensured that the open end of each hollow fiber membrane thread 100 is not blocked by foreign matter, and the open end of each hollow fiber membrane thread 100 is fixed in the annular cavity 6 by adhesive, and the part away from its open end is drooping and can be manually swung to a large extent, so that it is convenient to manually clean the attachments on the outer surface of each hollow fiber membrane thread 100.

[0040] like Figure 3As shown, the inner filter element 2 includes an inner filter element upper end cover 20, an inner filter element core material 21, and an inner filter element lower end cover 22; the outer diameter of the inner filter element upper end cover 20 is greater than or equal to the outer diameter of the inner filter element lower end cover 22, and the outer diameter of the inner filter element lower end cover 22 is smaller than the inner diameter of the guide tube 102; the inner filter element core material 21 is hollow tubular as a whole, and its upper end is installed in the inner filter element upper end cover 20, and its lower end is installed in the inner filter element lower end cover 22, and the clean water outlet 3 is arranged on the axis of the inner filter element lower end cover 22, and correspondingly, on the axis of the guide tube end cover 103. A clean water guide port 30 matching the clean water outlet 3 is provided; an annular convex rib 220 is provided on the outer end surface of the lower end cover 22 of the inner filter element, and an annular groove 8 is provided on the inner end surface of the guide pipe end cover 103, and a sealing flat gasket 9 is provided in the annular groove 8. The annular convex rib 220 and the sealing flat gasket 9 are closely connected to form a sealed connection structure to prevent water in the first flow channel 4 from leaking from this connection; a sealed connection is formed by arranging a plurality of O-ring sealing structures 23 on the outer side wall of the upper end cover 20 of the inner filter element and the inner wall of the opening 14.

[0041] In this embodiment, an annular groove 8 is also provided on the outer end surface of the lower end cover 13 of the outer filter element, and a sealing flat gasket 9 is provided in the annular groove 8; at the same time, a spare outlet 31 is also provided on the axis of the upper end cover 20 of the inner filter element.

[0042] In this embodiment, the water flow channel setting and water flow direction of the composite filter element are as follows: the preset inner cavity between the inner wall of the outer filter element 1 and the outer wall of the inner filter element 2 is the first flow channel 4 for water flow, the inner filter element 2 is hollow inside to form the second flow channel 5 for water flow, and the clean water outlet 3 is connected to the second flow channel 5; the upper end cover 12 of the outer filter element and the outer ring 101 form a fixed sealing connection, and ensure that there is enough space for water to flow through the inner flow channel 7 between the open end of the hollow fiber membrane 100, the upper port of the guide tube 102 and the inner bottom surface of the upper end cover 12 of the outer filter element, and the inner flow channel 7 is one of the components of the first flow channel 4; the raw water enters the interior of the hollow fiber membrane 100 laterally in the direction of intersection of the axis of the hollow fiber membrane 100, and then enters the inner flow channel 7 from its open end after being filtered through the membrane wall of each hollow fiber membrane 100, and then converges to the first flow channel 4, and then enters the second flow channel 5 after being filtered through the inner filter core material 21, and then flows out of the clean water from the clean water outlet 3. Example

[0043] like Figure 4 As shown, the flow guide pipe 102 and the flow guide pipe end cover 103 are an integrated structure. The rest is the same as that of the embodiment 1, and will not be described in detail here. Example

[0044] like Figure 5 , Figure 6As shown, the composite filter element includes an outer filter element 1 and an inner filter element 2, the outer filter element 1 is sleeved outside the inner filter element 2, and the two are coaxially arranged; the outer filter element 1 includes an outer filter element core material 10, an outer filter element skeleton 11, and an outer filter element upper end cover 12, an opening 14 is arranged on the outer filter element upper end cover 12, and the inner filter element 2 can be freely inserted or removed and replaced from the opening 14 as a whole; wherein, the outer filter element core material 10 is fixed on the outer filter element skeleton 11; the outer filter element core material 10 is formed by a bundle of a plurality of hollow fiber membrane filaments 100, each hollow fiber membrane filament 100 is in a capillary shape as a whole, the port at one end thereof is in a blocked shape, and the other end remains open; the outer filter element skeleton 11 includes an outer ring 101, a guide tube 102, and a guide tube end cover 103, and the three are coaxially arranged; the outer ring 101 is sleeved on the upper port of the guide tube 102, and the two are coaxial The two upper ends are arranged to be flush; the end cover 103 of the guide tube is fixedly connected to the lower end of the guide tube 102; an annular cavity 6 is formed between the inner wall of the outer ring 101 and the outer wall of the upper end of the guide tube 102, and the open ends of all the hollow fiber membrane threads 100 are bundled and received in the annular cavity 6, and the remaining gaps in the annular cavity 6 are filled with adhesive, and all the open ends of the hollow fiber membrane threads 100 fixed by the adhesive are flush with the upper ends of the outer ring 101 and the guide tube 102, and it is ensured that the open end of each hollow fiber membrane thread 100 is not blocked by foreign matter, and the open end of each hollow fiber membrane thread 100 is fixed in the annular cavity 6 by adhesive, and the part away from its open end is drooping and can be manually swung to a large extent, so that it is convenient to manually clean the attachments on the outer surface of each hollow fiber membrane thread 100.

[0045] like Figure 7 As shown, the inner filter element 2 includes an inner filter element upper end cover 20, an inner filter element core material 21, and an inner filter element lower end cover 22; the outer diameter of the inner filter element upper end cover 20 is greater than or equal to the outer diameter of the inner filter element lower end cover 22, and the outer diameter of the inner filter element lower end cover 22 is smaller than the inner diameter of the guide tube 102; the inner filter element core material 21 is hollow tubular as a whole, and its upper end is installed in the inner filter element upper end cover 20, and its lower end is installed in the inner filter element lower end cover 22, and the purified water outlet 3 is provided Placed on the axis of the upper end cover 20 of the inner filter element, the lower end cover 22 of the inner filter element is overall in the shape of a bottle cap and is used to seal the lower port of the inner filter core material 20; the guide tube end cover 103 is overall in the shape of a bottle cap and is used to seal the lower port of the guide tube 102, and the guide tube 102 and the guide tube end cover 103 are an integrated structure; a sealed connection is formed by arranging a plurality of O-ring sealing structures 23 on the outer side wall of the upper end cover 20 of the inner filter element and the inner wall of the opening 14.

[0046] In this embodiment, the water flow channel setting and water flow direction of the composite filter element are as follows: the preset inner cavity between the inner wall of the outer filter element 1 and the outer wall of the inner filter element 2 is the first flow channel 4 for water flow, the inner filter element 2 is hollow inside to form the second flow channel 5 for water flow, and the clean water outlet 3 is connected to the second flow channel 5; the upper end cover 12 of the outer filter element and the outer ring 101 form a fixed sealing connection, and ensure that there is enough space for water to flow through the inner flow channel 7 between the open end of the hollow fiber membrane 100, the upper port of the guide tube 102 and the inner bottom surface of the upper end cover 12 of the outer filter element, and the inner flow channel 7 is one of the components of the first flow channel 4; the raw water enters the interior of the hollow fiber membrane 100 laterally in the direction of intersection of the axis of the hollow fiber membrane 100, and then enters the inner flow channel 7 from its open end after being filtered through the membrane wall of each hollow fiber membrane 100, and then converges to the first flow channel 4, and then enters the second flow channel 5 after being filtered through the inner filter core material 21, and then flows out of the clean water from the clean water outlet 3. Example

[0047] like Figure 8 , Fig. 9 and Figure 7 As shown, the composite filter element comprises an outer filter element 1 and an inner filter element 2, wherein the outer filter element 1 is sleeved outside the inner filter element 2, and the two are coaxially arranged; the outer filter element 1 comprises an outer filter element core material 10 and an outer filter element upper end cover 12, an opening 14 is arranged on the outer filter element upper end cover 12, and the inner filter element 2 can be freely inserted or removed and replaced as a whole from the opening 14; the outer filter element core material 10 is a high-temperature sintered ceramic filter element, which is cylindrical as a whole and can be cleaned manually, with one end being open and the other end being a closed semicircular head; the inner filter element 2 comprises an inner filter element upper end cover 20, an inner filter element core material 21, and an inner filter element lower end cover 22; the outer diameter of the inner filter element upper end cover 20 is greater than or equal to the outer diameter of the inner filter element lower end cover 22 in outer diameter, the inner filter core material 21 is in the shape of a hollow tube as a whole and its upper end is installed in the inner filter upper end cover 20, and its lower end is installed in the inner filter lower end cover 22; the clean water outlet 3 is arranged on the inner filter upper end cover 20, and a sealed connection is formed by arranging a plurality of O-ring sealing structures 23 on the outer wall of the inner filter upper end cover 20 and the inner wall of the open port 14, and the inner filter lower end cover 22 is in the shape of a bottle cap as a whole to seal the lower port of the inner filter core material 21; the raw water is filtered through the outer wall of the outer filter core material 21 and then enters the first flow channel 4 laterally, and then enters the second flow channel 5 laterally after being filtered from the outer wall of the inner filter core material 21, and then flows out the clean water from the clean water outlet 3. Example

[0048] like Fig.10 , Fig.11 and Figure 7As shown, the composite filter element comprises an outer filter element 1 and an inner filter element 2, the outer filter element 1 is sleeved outside the inner filter element 2, and the two are coaxially arranged; the outer filter element 1 comprises an outer filter element core material 10, an outer filter element upper end cover 12 and an outer filter element lower end cover 13, an opening 14 is arranged on the outer filter element upper end cover 12, and the inner filter element 2 can be freely inserted or removed and replaced as a whole from the opening 14; the outer filter element core material 10 is a high-temperature sintered ceramic filter element, which is tubular as a whole and can be cleaned manually, its upper end is installed in the outer filter element upper end cover 12, and its lower end is installed in the outer filter element lower end cover 13; the inner filter element 2 comprises an inner filter element upper end cover 20, an inner filter element core material 21, and an inner filter element lower end cover 22; the outer diameter of the inner filter element upper end cover 20 is greater than or equal to the outer diameter of the inner filter element lower end cover 22 The outer diameter of the inner filter element 21 is a hollow tube as a whole and its upper end is installed in the inner filter element upper end cover 20, and its lower end is installed in the inner filter element lower end cover 22; the clean water outlet 3 is arranged on the inner filter element upper end cover 20, and a sealed connection is formed by arranging a plurality of O-ring sealing structures 23 on the outer wall of the inner filter element upper end cover 20 and the inner wall of the open port 14. The inner filter element lower end cover 22 is a bottle cap-shaped as a whole to block the lower port of the inner filter element 21, and the outer filter element lower end cover 13 is a bottle cap-shaped as a whole to block the lower port of the outer filter element 10; the raw water enters the first flow channel 4 laterally through the outer wall of the outer filter element 10, and then enters the second flow channel 5 laterally after being filtered from the outer wall of the inner filter element 21, and then flows out the clean water from the clean water outlet 3. Example

[0049] like Fig.12 , Fig.13 and Figure 3As shown, the composite filter element comprises an outer filter element 1 and an inner filter element 2, the outer filter element 1 is sleeved outside the inner filter element 2, and the two are coaxially arranged; the outer filter element 1 comprises an outer filter element core material 10, an outer filter element upper end cover 12 and an outer filter element lower end cover 13, an opening 14 is arranged on the outer filter element upper end cover 12, and the inner filter element 2 can be freely inserted or removed and replaced as a whole from the opening 14; the outer filter element core material 10 is a high-temperature sintered ceramic filter element, which is in a cylindrical shape as a whole and can be cleaned manually, and its upper end is installed in the outer filter element upper end cover 12, and its lower end is installed in the outer filter element lower end cover 13; the inner filter element 2 comprises an inner filter element upper end cover 20, an inner filter element core material 21, and an inner filter element lower end cover 22; the outer diameter of the inner filter element upper end cover 20 is greater than or equal to the outer diameter of the inner filter element lower end cover 22, and the inner filter element core material 21 is in a central shape as a whole It is hollow tubular and its upper end is installed in the upper end cover 20 of the inner filter element, and its lower end is installed in the lower end cover 22 of the inner filter element. A sealed connection is formed by arranging a plurality of O-ring sealing structures 23 on the outer side wall of the upper end cover 20 of the inner filter element and the inner wall of the open port 14; the clean water outlet 3 is arranged on the axis of the lower end cover 22 of the inner filter element, and correspondingly, a clean water guide port 30 matching the clean water outlet 3 is arranged on the axis of the lower end cover 13 of the outer filter element; an annular convex rib 220 is arranged on the outer end face of the lower end cover 22 of the inner filter element, and correspondingly, an annular groove 8 is arranged on the inner end face of the lower end cover 13 of the outer filter element, and a sealing flat gasket 9 is arranged in the annular groove 8, and the annular convex rib 220 and the sealing flat gasket 9 are in close contact to form a sealed connection structure to prevent water in the first flow channel 4 from leaking from this connection. The raw water enters the first flow channel 4 laterally through the outer wall of the outer filter core material 10 , then enters the second flow channel 5 laterally after being filtered from the outer wall of the inner filter core material 21 , and then flows out as purified water from the purified water outlet 3 .

[0050] In this embodiment, an annular groove 8 is also provided on the outer end surface of the lower end cover 13 of the outer filter element, and a sealing flat gasket 9 is provided in the annular groove 8; at the same time, a spare outlet 31 is also provided on the axis of the upper end cover 20 of the inner filter element.

[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

[0053] Although this article uses more terms such as outer filter element, outer filter element core material, outer filter element frame, outer filter element upper end cover, outer filter element lower end cover, open port, hollow fiber membrane, outer ring, guide tube, guide tube end cover, inner filter element, inner filter element upper end cover, inner filter element core material, inner filter element lower end cover, O-ring sealing structure, annular rib, clean water outlet, clean water guide port, spare outlet, first flow channel, second flow channel, annular cavity, inner flow channel, annular groove, sealing flat gasket, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element, characterized in that: include: An outer filter element and an inner filter element, wherein the outer filter element is sleeved outside the inner filter element, and the two are coaxially arranged; the outer filter element at least comprises an outer filter element core material and an outer filter element upper end cover, the outer surface of the outer filter element core material can be manually cleaned many times, an opening is arranged at the center of the outer filter element upper end cover, and the inner filter element can be freely inserted or removed and replaced from the opening as a whole; the inner wall of the opening and the outer wall of one end of the inner filter element form a sealed connection structure; one end of the inner filter element is provided with a clean water outlet and the clean water outlet passes through one end of the outer filter element; the preset inner cavity between the inner wall of the outer filter element and the outer wall of the inner filter element is the first flow channel of the water flow, the inner hollow of the inner filter element forms the second flow channel of the water flow, the clean water outlet and the second flow channel are connected, the raw water flows horizontally from the outer wall of the outer filter element into the first flow channel after filtering, and then flows horizontally from the outer wall of the inner filter element into the second flow channel after filtering, and then flows out from the clean water outlet.

2. The composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element according to claim 1, characterized in that: The outer filter element comprises an outer filter element core material, an outer filter element frame, and an outer filter element upper end cover, and the opening is arranged on the outer filter element upper end cover; the outer filter element core material is fixed on the outer filter element frame, and the outer filter element core material is formed by a bundle of a plurality of hollow fiber membranes, and each of the hollow fiber membranes is in the shape of a capillary as a whole, and the port at one end is blocked, while the other end remains open; the outer filter element frame comprises an outer ring, a flow guide tube, and a flow guide tube end cover, and the three are coaxially arranged; the outer ring is sleeved on the upper end port of the flow guide tube, and the two are coaxially arranged and the upper ends of the two are flush; the flow guide tube end The cover is fixedly connected to the lower end of the guide tube, and an annular cavity is formed between the inner wall of the outer ring and the outer wall of the upper end of the guide tube. All the open ends of the hollow fiber membranes are bundled and stored in the annular cavity, and the remaining gaps in the annular cavity are filled with adhesive. After being fixed by the adhesive, all the open ends of the hollow fiber membranes are flush with the outer ring and the upper end of the guide tube, and it is ensured that the open end of each hollow fiber membrane is not blocked by foreign matter, and the part of each hollow fiber membrane away from its open end can swing freely; the upper end cover of the outer filter element and the outer The ring forms a fixed sealing connection, and ensures that there is a preset inner flow channel sufficient for water to flow through between the open end of the hollow fiber membrane, the upper port of the guide tube and the inner bottom surface of the upper end cover of the outer filter element, and the inner flow channel is one of the components of the first flow channel; the inner filter element comprises an inner filter element upper end cover, an inner filter element core material, and an inner filter element lower end cover; the outer diameter of the inner filter element upper end cover is greater than or equal to the outer diameter of the inner filter element lower end cover, and the outer diameter of the inner filter element lower end cover is smaller than the inner diameter of the guide tube; the inner filter element core material is hollow tubular as a whole and its upper end is installed in the inner filter element upper end cover, and its The lower end is installed in the lower end cover of the inner filter element, and the clean water outlet is arranged on the upper end cover of the inner filter element or the lower end cover of the inner filter element. A sealed connection is formed by arranging a plurality of O-ring sealing structures on the outer side wall of the upper end cover of the inner filter element and the open inner wall; the raw water enters the interior thereof laterally through the direction of intersection of the axes of the hollow fiber membrane fibers, and then, the water enters the inner flow channel from the open end after being filtered through the membrane fiber wall of each hollow fiber membrane fiber, and then converges into the first flow channel, and then enters the second flow channel after being filtered through the core material of the inner filter element, and then the clean water flows out from the clean water outlet.

3. The composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element according to claim 2, characterized in that: The clean water outlet is arranged on the axis of the lower end cover of the inner filter element. Correspondingly, a clean water diversion port matching the clean water outlet is arranged on the axis of the end cover of the guide pipe, and the outer end surface of the lower end cover of the inner filter element and the inner end surface of the end cover of the guide pipe form a sealing connection to prevent water in the first flow channel from leaking from this connection.

4. The composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element according to claim 3, characterized in that: The outer end surface of the lower end cover of the inner filter element is provided with an annular convex rib, the inner end surface of the guide tube end cover is provided with an annular groove, a sealing flat gasket is provided in the annular groove, and the annular convex rib and the sealing flat gasket are in close contact to form a sealed connection structure.

5. The composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element according to claim 2, characterized in that: The purified water outlet is arranged on the axis of the upper end cover of the inner filter element, the lower end cover of the inner filter element is in the shape of a bottle cap as a whole and is used to seal the lower port of the inner filter element core material, and the end cover of the guide tube is in the shape of a bottle cap as a whole and is used to seal the lower port of the guide tube.

6. The composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element according to claim 2, characterized in that: The flow guide pipe and the flow guide pipe end cover are an integrated structure.

7. The composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element according to claim 1, characterized in that: The outer filter element comprises an outer filter element core material and an outer filter element upper end cover, and the opening is arranged on the outer filter element upper end cover; the outer filter element core material is a high-temperature sintered ceramic filter element, which is cylindrical as a whole, with one end being open and the other end being a closed semicircular head; the inner filter element comprises an inner filter element upper end cover, an inner filter element core material, and an inner filter element lower end cover; the outer diameter of the inner filter element upper end cover is greater than or equal to the outer diameter of the inner filter element lower end cover, the inner filter element core material is hollow tubular as a whole, and its upper end is installed in the inner filter element upper end cover, and its lower end is installed The clean water outlet is arranged on the upper end cover of the inner filter element, and a sealing connection is formed by arranging a plurality of O-ring sealing structures on the outer side wall of the upper end cover of the inner filter element and the open inner wall. The lower end cover of the inner filter element is in the shape of a bottle cap as a whole and is used to seal the lower port of the inner filter element core material. The raw water enters the first flow channel laterally after being filtered through the outer wall of the outer filter element core material, and then enters the second flow channel laterally after being filtered from the outer side wall of the inner filter element core material, and then the clean water flows out from the clean water outlet.

8. The composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element according to claim 1, characterized in that: The outer filter element comprises an outer filter element core material, an outer filter element upper end cover and an outer filter element lower end cover, and the opening is arranged on the outer filter element upper end cover; the outer filter element core material is a high-temperature sintered ceramic filter element, which is in the shape of a circular tube as a whole, and its upper end is installed in the outer filter element upper end cover, and its lower end is installed in the outer filter element lower end cover; the inner filter element comprises an inner filter element upper end cover, an inner filter element core material and an inner filter element lower end cover; the outer diameter of the inner filter element upper end cover is greater than or equal to the outer diameter of the inner filter element lower end cover, the inner filter element core material is in the shape of a hollow tube as a whole, and its upper end is installed in the inner filter element upper end cover, and its lower end is installed in the inner filter element lower end cover. Inside the lower end cover of the inner filter element; the clean water outlet is arranged on the upper end cover of the inner filter element, and a sealed connection is formed by arranging a plurality of O-ring sealing structures on the outer side wall of the upper end cover of the inner filter element and the open inner wall. The lower end cover of the inner filter element is in the shape of a bottle cap as a whole and is used to seal the lower port of the inner filter element core material, and the lower end cover of the outer filter element is in the shape of a bottle cap as a whole and is used to seal the lower port of the outer filter element core material; the raw water enters the first flow channel laterally through the outer wall of the outer filter element core material, and then enters the second flow channel laterally after being filtered from the outer side wall of the inner filter element core material, and then flows out the clean water from the clean water outlet.

9. The composite filter element structure with a hand-washable outer filter element and a replaceable inner filter element according to claim 1, characterized in that: The outer filter element comprises an outer filter element core material, an outer filter element upper end cover and an outer filter element lower end cover, and the opening is arranged on the outer filter element upper end cover; the outer filter element core material is a high-temperature sintered ceramic filter element, which is in the shape of a circular tube as a whole, and its upper end is installed in the outer filter element upper end cover, and its lower end is installed in the outer filter element lower end cover; the inner filter element comprises an inner filter element upper end cover, an inner filter element core material and an inner filter element lower end cover; the outer diameter of the inner filter element upper end cover is greater than or equal to the outer diameter of the inner filter element lower end cover, the inner filter element core material is in the shape of a hollow tube as a whole, and its upper end is installed in the inner filter element upper end cover, and its lower end is installed in the inner filter element lower end cover, through the inner filter element A plurality of O-ring sealing structures are arranged on the outer wall of the upper end cover to form a sealed connection with the inner wall of the opening, the clean water outlet is arranged on the axis of the lower end cover of the inner filter element, and correspondingly, a clean water guide port matching the clean water outlet is arranged on the axis of the lower end cover of the outer filter element, and the outer end surface of the lower end cover of the inner filter element and the inner end surface of the lower end cover of the outer filter element form a sealed connection to prevent water in the first flow channel from leaking from this connection; the raw water enters the first flow channel laterally through the outer wall of the outer filter element core material, and then enters the second flow channel laterally after being filtered from the outer wall of the inner filter element core material, and then flows out the clean water from the clean water outlet.

Images