Composite filter element components

Abstract

The present invention discloses a composite filter element assembly, comprising: a shell, a first filter group, and a second filter group. The shell comprises a bottle body, two bottle caps and a transition plate, the two ends of the bottle body are open, the transition plate is arranged in the bottle body, the two bottle caps are respectively sealed and connected to the two ends of the shell, a first accommodating chamber is defined between the bottle body and the transition plate and one of the bottle caps, a second accommodating chamber is defined between the bottle body and the transition plate and the other bottle cap, and a transition port is provided on the transition plate; the first filter group is arranged in the first accommodating chamber; the second filter group is arranged in the second accommodating chamber, and the water in the second accommodating chamber flows to the first accommodating chamber through the transition port after being filtered by the second filter group; wherein, at least one bottle cap is connected to the bottle body by a spin welding structure. The composite filter element assembly of the embodiment of the present invention has high strength, is not easy to leak, has good integrity, and is stable and reliable during filtering.

Description

Technical Field

[0001] The invention belongs to the technical field of water purification, and in particular relates to a composite filter element component. Background Art

[0002] The tap water delivered from the city water plant to each user usually contains a certain amount of salt ions, metal substances, chlorides, microorganisms, sediment, etc. In order to improve the quality of drinking water, more and more families choose to install water purifiers on the outlet pipes of tap water. The water purifiers are equipped with multi-functional filters to remove different types of harmful substances in the tap water.

[0003] Usually, the existing water purifier filter element is generally 3-4 levels, and some manufacturers' water purifier filter elements are double-core. In order to improve the filtering effect of the composite filter element assembly, a variety of filter element assemblies are usually arranged in the water purifier, and the water inlet and outlet of each filter element assembly are connected in series in sequence, and the two sides of different filter elements form a water inlet cavity and a water outlet cavity respectively. In order to achieve high-quality drinking water, it is often necessary to connect three or four levels of filter element assemblies in series, and the water outlets and water inlets between different filter element assemblies need to be connected by external pipes, which makes the composite filter element assembly pipeline system complicated, the water purifier occupies a large space, and it is inconvenient to install and replace the filter element.

[0004] When multiple different filter elements are integrated into one bottle, the bottle body is large, and it is difficult to connect the bottle body and the end cap, which is prone to leaks due to a loose fit; or the bottle body and the bottle cap do not match, increasing the difficulty of processing and the scrap rate, resulting in poor integrity of the shell and an unsightly appearance. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a composite filter element assembly, which has good integrity and excellent end sealing performance.

[0006] A composite filter element assembly according to an embodiment of the present invention comprises: a shell, the shell comprising a bottle body, two bottle caps and a transition plate, the two ends of the bottle body are open, the transition plate is arranged in the bottle body, the two bottle caps are respectively sealed and connected to the two ends of the shell, a first accommodating cavity is defined between the bottle body and the transition plate and one of the bottle caps, a second accommodating cavity is defined between the bottle body and the transition plate and the other of the bottle caps, and a transition port is provided on the transition plate; a first filter group, the first filter group is arranged in the first accommodating cavity; a second filter group, the second filter group is arranged in the second accommodating cavity, water in the second accommodating cavity is filtered by the second filter group, and then flows to the first accommodating cavity through the transition port; wherein at least one of the bottle caps is connected to the bottle body by a spin welding structure.

[0007] According to the composite filter element assembly of the embodiment of the present invention, two accommodating chambers are separated by arranging a transition plate in the shell, and two filter groups can be integrated and installed inside the shell, which diversifies the filtering functions and increases the filtering effect of tap water. The high integration and small overall volume greatly reduce the space required for installation. The external pipes required for connecting the two groups of filter groups are reduced, making the overall layout of the composite filter element assembly compact, saving material costs to a certain extent. The transition plate can also support the filter groups on both sides, so that the filter groups are not easy to tilt during long-term use. The bottle cap and the bottle body are connected by a spin welding structure, which can enhance the connection strength between the bottle cap and the bottle body at this end, so that the bottle body at this end connected by the spin welding structure can withstand higher water pressure and maintain a good sealing effect to prevent water leakage. The use of a spin welding structure can increase the overall strength and structural stability of the composite filter element assembly.

[0008] According to a composite filter element assembly of one embodiment of the present invention, the portion where the end face of the bottle body contacts the end face of the bottle cap includes a bevel welding area, the bevel welding area is a circular ring arranged around the central axis of the bottle body, and the bevel welding area is a circumferential surface of a truncated cone.

[0009] According to a further embodiment of the present invention, at least one of the end surface of the bottle body and the end surface of the bottle cap is provided with a spin welding overflow groove, and the spin welding overflow groove is located radially outside the inclined surface welding area.

[0010] According to yet another embodiment of the present invention, the spin welding overflow groove and the inner flange are provided on one of the bottle body and the bottle cap, and the inner flange is fitted on the inner circumferential surface of the other one of the bottle body and the bottle cap.

[0011] According to a composite filter element assembly of one embodiment of the present invention, the two bottle caps are both spin-welded to the bottle body, and the first filter group is provided with a first end structure and a second end structure at both ends, the first filter group is connected to the transition plate and the bottle cap through the first end structure and the second end structure, the first end structure is rotatable relative to the transition plate, and the second end structure is rotatable relative to the bottle cap; the second filter group is provided with a third end structure and a fourth end structure at both ends, the second filter group is connected to the transition plate and the bottle cap through the third end structure and the fourth end structure, the third end structure is rotatable relative to the transition plate, and the fourth end structure is rotatable relative to the bottle cap.

[0012] According to a further embodiment of the present invention, a first inlet and outlet, a second inlet and outlet, and a third inlet and outlet are provided on the shell, the first filter group includes a first filter element, a second filter element and a waterway partition plate, the waterway partition plate is respectively connected to the first end structure and the second end structure to separate the first accommodating chamber into a first low-pressure area and a second low-pressure area, the first filter element is arranged in the first low-pressure area, and water flowing in from the first inlet and outlet flows out from the second inlet and outlet after passing through the first filter element, the second filter element is arranged in the second low-pressure area, and water flowing in from the transition port flows out from the third inlet and outlet after passing through the second filter element.

[0013] According to a specific embodiment of the present invention, the waterway partition is cylindrical, the second filter element is located on the inner side of the waterway partition, the first filter element is jacketed on the outer side of the waterway partition, and both ends of the first filter element and both ends of the second filter element are sealed by the cooperation of the first end structure and the second end structure.

[0014] According to a composite filter element assembly of an embodiment of the present invention, a fourth inlet and a fifth inlet are provided on the shell, the second filter group includes: a reverse osmosis membrane element, the reverse osmosis membrane element includes: a central tube group and a plurality of reverse osmosis membrane bags, the central tube group includes a central tube and a plurality of wastewater headers arranged at intervals, the plurality of wastewater headers are arranged around the central tube, a filtered water inlet hole is provided on the tube wall of the central tube, and a wastewater inlet hole is provided on the tube wall of the wastewater header; the reverse osmosis membrane bag has a first part located inside the central tube group and a second part located outside the central tube group, each of the wastewater headers and the central tube is separated by the first part of at least one reverse osmosis membrane bag, and the second parts of the plurality of reverse osmosis membrane bags form a multilayer film assembly surrounding the central tube group; wherein, water entering the second accommodating chamber from the fourth inlet and outlet flows to the filtered water inlet hole after being filtered by the reverse osmosis membrane bag, the wastewater header is connected to the fifth inlet and outlet, and the central tube is connected to the transition port.

[0015] According to a further embodiment of the present invention, two axial ends of the circular cylinder rolled out of the reverse osmosis membrane bag are glued to the third end structure and the fourth end structure.

[0016] According to a composite filter element assembly of one embodiment of the present invention, when one of the bottle caps is connected to the bottle body by a spin welding structure, a non-circular spin welding tool fixing boss is provided on the surface of the transition plate on the opposite side of the other bottle cap; when both of the bottle caps are connected to the bottle body by a spin welding structure, a non-circular spin welding tool fixing boss is provided on the surface of at least one side of the transition plate.

[0017] According to a composite filter element assembly of one embodiment of the present invention, at least one circle of fixed axis protrusions are provided on the outer periphery of the first filter group and the second filter group, and the plurality of fixed axis protrusions in each circle are respectively stopped on the inner wall of the shell.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 The figure is a schematic diagram of the internal structure of a composite filter element assembly according to an embodiment of the present invention.

[0021] Figure 2 A bottom view of a composite filter element assembly according to an embodiment of the present invention.

[0022] Figure 3 for Figure 1 The internal structure diagram of the first filter element, the second filter element, and the third filter element is omitted.

[0023] Figure 4 This is a schematic structural diagram of a composite filter element assembly according to an embodiment of the invention without an internal filter group.

[0024] Figure 5 for Figure 4 A partial enlarged schematic diagram of area I in the middle.

[0025] Figure 6 for Figure 4 A partial enlarged schematic diagram of the spin-welded structure on the second end cover in the middle region II.

[0026] Figure 7 for Figure 4 A partial enlarged schematic diagram of the spin-welded structure on the first end cover of the middle region III.

[0027] Figure 8 It is a bottom view structural schematic diagram of a transition plate of a composite filter element assembly according to an embodiment of the present invention.

[0028] Fig. 9 The figure is a schematic top view of the structure of a transition plate of a composite filter element assembly according to an embodiment of the present invention.

[0029] Fig.10 The figure is a top view of a third end cover according to an embodiment of the present invention.

[0030] Fig.11 The figure is a bottom view of a third end cover according to an embodiment of the present invention.

[0031] Fig.12 The figure is a bottom view of a fourth end cover according to an embodiment of the present invention.

[0032] Fig.13 FIG. 4 is a top view of a fourth end cover according to an embodiment of the present invention.

[0033] Fig.14 It is a schematic diagram of the three-dimensional structure of a central pipe and a wastewater header according to an embodiment of the present invention.

[0034] Fig.15 The present invention is a top view of a reverse osmosis membrane bag, a central tube and a wastewater header according to an embodiment of the present invention.

[0035] Fig.16 FIG. 1 is a top view of a reverse osmosis membrane element according to an embodiment of the present invention.

[0036] Reference numerals:

[0037] Composite filter element assembly 1000;

[0038] First accommodating chamber 100; first filter group 1001; first low pressure area 1002; second low pressure area 1003;

[0039] A first filter element 10; a first uniformly distributed flow channel 11; a second uniformly distributed flow channel 12;

[0040] A first inlet and outlet 101; a second inlet and outlet 102;

[0041] A second filter element 20; a third uniformly distributed flow channel 21; a fourth uniformly distributed flow channel 22;

[0042] Third import and export 201;

[0043] First end structure 401; second end structure 402;

[0044] A first inner end cover 41;

[0045] First outer end cover 42; first insert pipe 421;

[0046] Second inner end cap 43; inner port 431; fifth insertion tube 432;

[0047] Second outer end cover 44; outer port 441; sixth insertion tube 442;

[0048] Second middle end cover 45; middle port 451; seventh insertion tube 452;

[0049] Waterway partition 46;

[0050] Spacer bracket 49;

[0051] Second accommodating chamber 200; second filter group 2001; high pressure area 2002;

[0052] The third filter element 30; the fifth uniform flow channel 31; the reverse osmosis membrane bag 32; the central tube 33; the wastewater header 34;

[0053] The fifth entrance and exit 301; the fourth entrance and exit 302;

[0054] The third end structure 47; the second insert tube 471; the third insert tube 472; the first positioning protrusion 473; the first axis fixing protrusion 474;

[0055] Fourth end structure 48; fourth insert pipe 481; waste outlet 482; second positioning protrusion 483; second axis fixing protrusion 484;

[0056] Housing 300;

[0057] Bottle cap 3001;

[0058] A first bottle cap 310; a first connecting pipe 311; a second connecting pipe 312; a third connecting pipe 313; a handle 314;

[0059] A second bottle cap 320; a fourth connecting pipe 321;

[0060] Bottle body 3002;

[0061] Transition plate 3003; transition port 3004; spin welding fixture fixing boss 3005;

[0062] Spin-welded structure 400;

[0063] Bevel welding area 410;

[0064] Spin welding overflow trough 420;

[0065] Inner flange 430. DETAILED DESCRIPTION

[0066] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0067] Reference below Figure 1-Figure 16 The structure of the composite filter element assembly 1000 according to the embodiment of the present invention is described.

[0068] A composite filter element assembly 1000 according to an embodiment of the present invention, such as Figure 1 As shown, it includes: a housing 300 , a first filter group 1001 , and a second filter group 2001 .

[0069] Among them, Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the housing 300 includes a bottle body 3002, two bottle caps 3001 and a transition plate 3003. The two ends of the bottle body 3002 are open, the transition plate 3003 is arranged in the bottle body 3002, and the two bottle caps 3001 are respectively sealed and connected to the two ends of the housing 300. The bottle caps 3001 seal the housing 300 to form a whole, protecting the internal filter group structures from the influence of the external environment.

[0070] like Figure 3 , Figure 4 As shown, a first accommodating cavity 100 is defined between the bottle body 3002, the transition plate 3003, and one of the bottle caps 3001, a second accommodating cavity 200 is defined between the bottle body 3002, the transition plate 3003, and the other bottle cap 3001, and a transition opening 3004 is provided on the transition plate 3003. Here, the transition plate 3003 enables the first accommodating cavity 100 and the second accommodating cavity 200 to form two generally separated cavities in the housing 300, and the two cavities are connected only through the transition opening 3004.

[0071] For the convenience of description, one of the bottle caps 3001 is hereinafter referred to as the first bottle cap 310, and the other bottle cap 3001 is hereinafter referred to as the second bottle cap 320. When the first accommodation cavity 100 is defined between the bottle body 3002, the transition plate 3003 and the first bottle cap 310, the second accommodation cavity 200 is defined between the bottle body 3002, the transition plate 3003 and the second bottle cap 320.

[0072] like Figure 1 As shown, the two filter groups are respectively a first filter group 1001 and a second filter group 2001. The first filter group 1001 is arranged in the first accommodating chamber 100, and the second filter group 2001 is arranged in the second accommodating chamber 200. After the water in the second accommodating chamber 200 is filtered by the second filter group 2001, it flows to the first accommodating chamber 100 through the transition port 3004. By arranging two filter groups in the housing 300, the composite filter element assembly 1000 can have more filtering functions, increase the integration, and there is no need to arrange an external pipeline for the water filtered by the second filter group 2001 to flow to the first accommodating chamber 100, which simplifies the pipeline layout.

[0073] Among them, Figure 4As shown, at least one of the two bottle caps 3001 is connected to the bottle body 3002 via a spin welding structure 400. Here, at least one bottle cap 3001 indicates that either the first bottle cap 310 is connected to the bottle body 3002 via a spin welding structure 400, or the second bottle cap 320 is connected to the bottle body 3002 via a spin welding structure 400, or both the first bottle cap 310 and the second bottle cap 320 are connected to the bottle body 3002 via a spin welding structure 400.

[0074] The so-called spin welding structure 400 refers to a connection structure formed by connecting the contact surfaces of the bottle cap 3001 and the bottle body 3002 after spin welding. Specifically, the bottle cap 3001 and the bottle body 3002 are kept rotating relative to each other, and the contact surfaces of the two generate heat by friction, and the contact surface materials are melted by heat and glued together.

[0075] It is understandable that when the bottle cap 3001 and the bottle body 3002 are connected by the spin welding structure 400, the connection strength between the bottle cap 3001 and the bottle body 3002 at this end can be enhanced, so that the bottle body 3002 at this end connected by the spin welding structure 400 can withstand higher water pressure and maintain a good sealing effect. Spot welding or other welding methods require pre-embedded solder, and some require heating along the bottle cap 3001 with a welding gun. If there is a place that is not welded to the place, it is easy to leak. By adopting spin welding, the contact surface can be evenly heated all around, and the contact surface can be melted by heat and glued together all around, that is, a complete sealing ring is formed all around the contact surface. Thus, it is possible to prevent the housing 300 from leaking when the internal filter group is working.

[0076] The bottle body 3002 and the bottle cap 3001 connected by the spin welding structure 400 form a stable connection relationship. The end cap 3001 is not easy to be misplaced, which provides stable support and limiting effect for the internally installed filter group, and provides a stable access port or outlet for the connection of the external pipeline system, so that the overall structure of the composite filter element assembly 1000 is stable, high in strength, and good in reliability.

[0077] When the bottle cap 3001 at one end is connected to the bottle body 3002 by the spin welding structure 400, and the bottle cap 3001 at the other end can be connected to the bottle body 3002 in an openable and closable manner, the structure of the end connected by the spin welding structure 400 is stable. When assembling, the filter assembly at this end can be firstly assembled into the corresponding accommodating cavity, and the filter group installed between the bottle cap 3001 welded with the bottle body 3002 and the transition plate 3003 forms a stable structure, and the corresponding filter group and the bottle cap 3001 are not easy to loosen and collide, which reduces the risk of the filter group shaking and being damaged, and also reduces the probability of the bottle cap 3002 cracking. The bottle cap 3001 on the other side that can be opened and closed and connected to the bottle body 3002 is convenient for replacing the filter group in the accommodating cavity corresponding to the side. This design form can meet the needs of replacing local filter materials and save the replacement cost of filter materials.

[0078] When the bottle caps 3001 at both ends are connected to the bottle body 3002 by the spin welding structure 400, the entire composite filter element assembly 1000 is made into an integrally disposable filter element assembly, realizing an integrally disposable filter element assembly of the filter material.

[0079] In addition, compared with the existing filter element assembly in which only one filter group is arranged in each housing and each filter group is connected through an external pipe, the external pipes required for connecting each filter group are greatly simplified, so that the composite filter element assembly 1000 of the present invention occupies less space, has a compact overall layout, and saves the internal volume of the user's cabinet; at the same time, the overall aesthetic performance is enhanced. All filter groups are arranged in the housing 300, and only one set of positioning and mounting structures is required for the overall installation of the composite filter element assembly 1000, which is simple to assemble and saves time.

[0080] In some embodiments of the present invention, Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the portion where the end face of the bottle body 3002 contacts the end face of the bottle cap 3001 includes a bevel welding area 410. The bevel welding area 410 is a circular ring arranged around the central axis of the bottle body 3002, and the bevel welding area 410 is a truncated cone circumferential surface, that is, the bevel welding area 410 has a certain inclination in the radial direction, or the bevel welding area 410 is formed as a conical surface with the cone tip removed.

[0081] The inclined welding area 410 is set in this way. On the one hand, the circumferential surface of the truncated cone has the function of centering, so that the bottle cap 3001 and the bottle body 3002 can remain coaxial when rotating and welding. On the other hand, the circumferential surface of the truncated cone increases the contact area, and increases the radial width of the adhesive connection surface formed by the spin welding connection, so that the torsion resistance and bending resistance of the connection are enhanced. Another very important point is that the molten material has a certain fluidity after the contact surface is heated and melted. The setting of the inclined welding area 410 can guide the molten material in a favorable direction, preferably to guide the molten material toward the outside of the shell 300, to avoid the formation of welding slag and flash formed by the cooling of the molten material inside the shell 300. Moreover, after the diversion, the molten material can be made more uniform, and the adhesive connection surface formed by the spin welding connection can be made wider.

[0082] Optionally, a parallel bevel welding area 410 is formed between the bottle body 3002 and the bottle cap 3001. That is, when a bevel welding area 410 inclined from top to bottom is formed on the bottle body 3002, a bevel welding area 410 inclined from top to bottom is also formed on the corresponding bottle cap 3001. Conversely, it is also possible. This facilitates the seamless connection between the bottle body 3002 and the bottle cap 3001 after welding, which is conducive to improving the local welding strength.

[0083] Advantageously, the bottle body 3002 is kept vertically arranged during spin welding, and when a bottle cap 3001 is spin welded, the inclined welding area 410 of the bottle cap is kept in a state with a small diameter at the upper end and a large diameter at the lower end, so that the molten material can be directed toward the outside of the shell 300.

[0084] In some embodiments of the present invention, a spin welding overflow groove 420 is provided on at least one of the end surfaces of the bottle body 3002 and the bottle cap 3001 , and the spin welding overflow groove 420 is located radially outside the inclined welding area 410 .

[0085] Here, if the bottle cap 3001 is located above the bottle body 3002, and the upper end diameter of the inclined surface welding area 410 between the two is small and the lower end diameter is large, it is best to form the spin welding overflow groove 420 on the bottle body 3002. If the bottle body 3002 is located above the bottle cap 3001, and the upper end diameter of the inclined surface welding area 410 between the two is small and the lower end diameter is large, it is best to form the spin welding overflow groove 420 on the bottle cap 3001.

[0086] The spin welding overflow groove 420 can collect welding slag during the spin welding process. The welding slag collected in the spin welding overflow groove 420 can increase the local strength after solidification. The spin welding overflow groove 420 can also prevent the welding slag from overflowing to the outer surface of the shell 300 to prevent the formation of flash.

[0087] Optionally, the inner edge of the spin welding overflow groove 420 is connected to the maximum diameter edge of the inclined welding area 410. Cooperating with the diversion work of welding slag, it is beneficial to collect all welding slag during spin welding.

[0088] In some embodiments of the present invention, one of the bottle body 3002 and the bottle cap 3001 is provided with a spin welding overflow groove 420 and an inner flange 430, and the inner flange 430 is matched on the inner circumference of the other of the bottle body 3002 and the bottle cap 3001. Here, when the bottle body 3002 is provided with a spin welding overflow groove 420 and an inner flange 430, the inner flange 430 is matched on the inner circumference of the bottle cap 3001. When the bottle cap 3001 is provided with a spin welding overflow groove 420 and an inner flange 430, the inner flange 430 is matched on the inner circumference of the bottle body 3002. The setting of the inner flange 430 enhances the local strength of the welding between the bottle body 3002 and the bottle cap 3001, and provides a limiting relationship of the inner circumference for both. In addition, the inner flange 430 can also prevent the molten material from flowing into the bottle body 3002 when the spin welding.

[0089] Optionally, when the axis of the bevel welding area 410 is arranged vertically, and the upper end diameter is small and the lower end diameter is large, the end surface of the inner flange 430 is higher than the minimum diameter edge of the bevel welding area 410. Further optionally, on the bottle body 3002 or bottle cap 3001 provided with the inner flange 430, an inner overflow groove is provided between the inner flange 430 and the minimum diameter edge of the bevel welding area 410 to further prevent welding slag from flowing into the internal accommodation cavity of the bottle body 3002.

[0090] In some embodiments of the present invention, Figure 1 , Figure 3 , Figure 4 As shown, the two bottle caps 3001 are both spin-welded to the bottle body 3002 to form an integral disposable composite filter element assembly 1000 .

[0091] Moreover, the first end structure 401 and the second end structure 402 are respectively provided at both ends of the first filter group 1001. The first filter group 1001 is connected to the transition plate 3003 and the bottle cap 3001 through the first end structure 401 and the second end structure 402 respectively. The first end structure 401 is rotatable relative to the transition plate 3003, and the second end structure 402 is rotatable relative to the bottle cap 3001.

[0092] The two ends of the first filter group 1001 are respectively limited between the bottle cap 3001 and the transition plate 3003, so that the first filter group 1001 is easy to install, has a certain degree of adjustability during installation, and will not be skewed as a whole after installation. When the first filter group 1001 is impacted by the water flow, the first filter group 1001 that can rotate relative to the bottle cap 3001 and the transition plate 3003 has a certain buffer movement space, and is not easy to be skewed due to excessive water pressure. The uniform distribution of water flow can be achieved more quickly.

[0093] The second filter group 2001 is provided with a third end structure 47 and a fourth end structure 48 at both ends respectively. The second filter group 2001 is connected to the transition plate 3003 and the bottle cap 3001 through the third end structure 47 and the fourth end structure 48 respectively. The third end structure 47 is rotatable relative to the transition plate 3003, and the fourth end structure 48 is rotatable relative to the bottle cap 3001.

[0094] The two ends of the second filter group 2001 are respectively limited between the bottle cap 3001 and the transition plate 3003, so that the second filter group 2001 has a certain degree of adjustability during installation, and the whole will not be skewed after installation.

[0095] In this way, the filter group is connected to the transition port 3004 on the transition plate 3003 and the inlet and outlet on the bottle cap 3001 through the end structure, which is very convenient to connect and reduces unnecessary pipelines. In addition, during the assembly process of the bottle cap 3001, it is inevitable that the bottle cap 3001 needs to be tightened or loosened by rotation, especially when the bottle cap 3001 is connected to the bottle body 3002 by spin welding, the end structure is rotatably connected, so that the filter group will not be damaged. In addition, during the tightening process of the bottle cap 3001, the end structure can be connected more tightly with the transition plate 3003 and the bottle cap 3001.

[0096] In some embodiments of the present invention, Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the housing 300 is provided with a first inlet and outlet 101, a second inlet and outlet 102, and a third inlet and outlet 201. The first filter group 1001 includes a first filter element 10, a second filter element 20, and a waterway partition plate 46. The waterway partition plate 46 is connected to the first end structure 401 and the second end structure 402, respectively, to partition the first accommodating chamber 100 into a first low-pressure area 1002 and a second low-pressure area 1003 (as shown in FIG. Figure 3 shown).

[0097] The first filter element 10 is arranged in the first low-pressure area 1002. The water flowing in from the first inlet and outlet 101 flows out from the second inlet and outlet 102 after passing through the first filter element 10. The second filter element 20 is arranged in the second low-pressure area 1003. The water flowing in from the transition port 3004 flows out from the third inlet and outlet 201 after passing through the second filter element 20. The waterway partition plate 46 separates the first filter element 10 and the second filter element 20 in the first accommodating chamber 100 to form two independent purified waterways. Other filter elements can be connected between the two groups of filter elements; the water inlet of the first filter element 10 and the water outlet of the second filter element 20 can also be directly connected, or the water outlet of the first filter element 10 and the water inlet of the second filter element 20 can be directly connected, so that the purified waterway between the first filter element 10 and the second filter element 20 forms a front-to-back series relationship.

[0098] The low pressure area here indicates that the first filter element 10 and the second filter element 20 can work normally during filtering without applying additional external pressure.

[0099] Optionally, the water pressure in the first low-pressure area 1002 and the second low-pressure area 1003 is less than or equal to the municipal water supply pressure, so that tap water can enter the entrance of the low-pressure area.

[0100] Optionally, the water pressure in the first low-pressure zone 1002 is 0.1-0.4 MPa, so that tap water can easily enter the first low-pressure zone 1002 from the external pipe network system and be filtered by the first filter element 10 .

[0101] In some embodiments of the present invention, Figure 1 , Figure 3 As shown, the waterway partition plate 46 is cylindrical, the second filter element 20 is located on the inner side of the waterway partition plate 46, the first filter element 10 is jacketed on the outer side of the waterway partition plate 46, and both ends of the first filter element 10 and both ends of the second filter element 20 are blocked by the first end structure 401 and the second end structure 402.

[0102] Optionally, a first uniform flow channel 11 is defined between the first filter element 10 and the inner wall of the first accommodating chamber 100, and a second uniform flow channel 12 is defined between the waterway partition plate 46 and the first filter element 10. Here, when the liquid to be purified by the first filter element 10 is uniformly distributed in the first uniform flow channel 11, the liquid purified by the first filter element 10 is uniformly distributed in the second uniform flow channel 12; vice versa.

[0103] A third uniform flow channel 21 is defined between the waterway partition plate 46 and the second filter element 20. The first filter element 10, the waterway partition plate 46 and the second filter element 20 are cylindrical and arranged in sequence. The central cavity of the second filter element 20 is the fourth uniform flow channel 22. Here, the fourth uniform flow channel 22 is located at the center of the first accommodating cavity 100 and is cylindrical.

[0104] The outer side of the fourth uniform flow channel 22 is compactly arranged in the radial direction with a second filter element 20, a third uniform flow channel 21, a waterway partition plate 46, a second uniform flow channel 12, a first filter element 10, and a first uniform flow channel 11. The third uniform flow channel 21 and the second uniform flow channel 12 are isolated from each other by the waterway partition plate 46. The first accommodating chamber 100 is compactly arranged as a whole, occupies less installation space, and has a high degree of integration. The first filter element 10 and the second filter element 20 are conveniently installed.

[0105] In some embodiments of the present invention, Figure 1 , Figure 3 As shown, the first end structure 401 includes: a first outer end cover 42, and the first outer end cover 42 is sealed and connected to one end of the waterway partition plate 46. Figure 1 As shown in the figure, the first outer end cap 42 closes the bottom of the first filter element 10 and the second uniform flow channel 12, and provides support for the first filter element 10, effectively preventing the liquid to be purified and the purified liquid on both sides of the first filter element 10 from flowing together at the bottom, thereby ensuring the filtering effect of the first filter element 10. The waterway partition plate 46 is connected to the first outer end cap 42, which is conducive to the first outer end cap 42 being firmly set at a specific position, so that the second uniform flow channel 12 and the third uniform flow channel 21 are reliably separated, avoiding the liquid in the first filter element 10 and the second filter element 20 from flowing together, and avoiding the reduction of water quality in each uniform flow channel.

[0106] Optionally, the waterway partition plate 46 and the first outer end cover 42 are integrally formed. Integral forming facilitates processing and manufacturing. After integral forming, it is not easy to have a gap between the waterway partition plate 46 and the first outer end cover 42, and the position is relatively stable.

[0107] The first outer end cover 42 is provided with a first insert pipe 421 connected to the second low pressure area 1003, and the first insert pipe 421 is plugged into the transition plate 3003. The first insert pipe 421 is plugged into the transition plate 3003, which, on the one hand, further closes the transition port 3004 to prevent unnecessary cross-flow of liquid between the first accommodating chamber 100 and the second accommodating chamber 200; on the other hand, it makes it easier to connect the flow channel between the second filter element 20 and the second filter group 2001.

[0108] The end surface of the first filter element 10 is glued to the first outer end cap 42. This is not only convenient for assembly, but also convenient for installation of the integrated core. Optionally, the first filter element 10 is sealed and connected to the first outer end cap 42 by a circle of hot melt adhesive.

[0109] In some embodiments of the present invention, Figure 1 , Figure 3 As shown, the second end structure 402 includes: a second outer end cover 44 and a second middle end cover 45 .

[0110] The second outer end cover 44 is plugged into the bottle cap 3001 ( Figure 1 The first bottle cap 310 is in the middle, and the end face of the first filter element 10 is glued to the second outer end cap 44. The second outer end cap 44 closes the top of the first filter element 10 and the second uniformly distributed flow channel 12, and provides a connection for the first filter element 10, separates the first inlet and outlet 101 and the second inlet and outlet 102, effectively preventing the liquid to be purified and the purified liquid on both sides of the first filter element 10 from being connected at the top, further ensuring the filtering effect of the first filter element 10.

[0111] Specifically, the second outer end cap 44 is fitted on the axial end face of the first filter element 10 away from the transition port 3004 to block the first filter element 10 , and the second outer end cap 44 is provided with an outer port 441 plugged into the bottle cap 3001 .

[0112] Optionally, the periphery of the second outer end cap 44 is provided with a downward outer flange, and the inner side of the outer flange contacts the outer peripheral surface of the first filter element 10. The provision of the outer flange makes the connection between the second outer end cap 44 and the first filter element 10 tighter, and increases the reliability of the connection. It can also enhance the liquid sealing effect of the second outer end cap 44 on the end surface of the first filter element 10, and can form a foolproof fit with the first filter element 10, which is easy to assemble.

[0113] The axial end surface of the first filter element 10 is glued to the second outer end cover 44, which is not only convenient for assembly, but also convenient for installation of the integrated core. Optionally, the first filter element 10 is sealed and connected to the second outer end cover 44 by a circle of hot melt adhesive.

[0114] exist Figure 3 In the example of , a sixth insert tube 442 is formed on the second outer end cover 44, and the tube mouth of the sixth insert tube 442 forms the above-mentioned outer port 441. The sixth insert tube 442 can be inserted into the second connecting tube 312, or the sixth insert tube 442 can be inserted outside the second connecting tube 312. To improve the sealing effect, a sealing ring is provided between the sixth insert tube 442 and the second connecting tube 312.

[0115] It can be seen here that one end of the first filter element 10 is plugged into the transition port 3004 through the first outer end cap 42, and the other end of the first filter element 10 is plugged into the second pipe 312 through the second outer end cap 44, so that the position of the first filter element 10 is basically fixed, and the assembly steps only involve the plugging process of the two ends, which shows that the assembly is very simple and time-saving. Moreover, as long as the housing 300 is not deformed, the two ends of the first filter element 10 will not fall out, which shows that the assembly reliability of the first filter element 10 is high.

[0116] In addition, the second middle end cover 45 is sealed and connected to the peripheral wall of the waterway partition plate 46, and the second middle end cover 45 is inserted into the bottle cap 3001 ( Figure 1 : the first bottle cap 310).

[0117] Alternatively, if Figure 3 As shown, a third connecting pipe 313 is provided on the inner peripheral wall of the first bottle cap 310 facing the bottle body 3002 , and a middle port 451 is provided on the second middle end cap 45 to be plug-connected with the third connecting pipe 313 .

[0118] In the embodiment of the present invention, the second middle end cover 45 may not be provided, so that the waterway partition plate 46 can be directly connected to the third connecting pipe 313, thus saving the number of parts. However, since the second filter element 20 is to be assembled to the inner side of the waterway partition plate 46, if the opening of the waterway partition plate 46 is small, it cannot be assembled, and if the opening of the waterway partition plate 46 is large, it will affect the assembly of the second outer end cover 44 and the first filter element 10, and the overall assembly difficulty will be increased.

[0119] Therefore, it is proposed here to set a second middle end cover 45. When assembling, first install the second filter element 20 and other parts into the waterway partition plate 46, and then connect the second middle end cover 45 to the waterway partition plate 46, so as to meet the assembly requirements and improve the reliability of the overall assembly. On the other hand, when the waterway partition plate 46 and the first outer end cover 42 are integrally formed, they can be manufactured by integral injection molding. At this time, in order to facilitate mold opening, it is not suitable to integrally inject the second middle end cover 45.

[0120] A third connecting pipe 313 is provided on the first bottle cap 310, and the third connecting pipe 313 is plugged and connected with the middle port 451. The only step for fixing the end of the waterway partition plate 46 is the plugging process, which is very simple and time-saving, and has high reliability. Figure 3 In the example of , a seventh inserting tube 452 is formed on the second middle end cover 45, and the tube mouth of the seventh inserting tube 452 forms the above-mentioned middle port 451. The seventh inserting tube 452 can be inserted into the third connecting tube 313, or the seventh inserting tube 452 can be inserted outside the third connecting tube 313. To improve the sealing effect, a sealing ring is provided between the seventh inserting tube 452 and the third connecting tube 313, and a sealing ring is also provided between the second middle end cover 45 and the waterway partition plate 46.

[0121] exist Figure 1 In the example of , the distance between the second middle end cover 45 and the second outer end cover 44 is small, so that the water pressure can reach a delicate balance when the water flows through the first filter element 10. That is, when the water pressure inside the waterway partition plate 46 is greater than the water pressure outside, the second middle end cover 45 may be squeezed on the second outer end cover 44, slowing down the filtering speed of the first filter element 10. When operating normally, the water flows through the second middle end cover 45 and flows normally toward the second inlet and outlet 102.

[0122] In some embodiments of the present invention, the second filter element 20 is cylindrical and is spaced apart from the waterway partition plate 46. The third uniformly distributed flow channel 21 is formed between the cylindrical second filter element 20 and the waterway partition plate 46.

[0123] In some embodiments of the present invention, Figure 1 , Figure 3 As shown, the second end structure 402 also includes: a second inner end cover 43, the second inner end cover 43 is plugged into the bottle cap 3001 ( Figure 1 (a first bottle cap 310 is shown in the figure). The plug-in fit facilitates assembly.

[0124] Optionally, the second inner end cap 43 is fitted on the axial end face of the second filter element 20 away from the transition port 3004 to block the second filter element 20, and the second inner end cap 43 is provided with an inner port 431 connected to the third inlet and outlet 201. Here, the second inner end cap 43 closes the top of the second filter element 20, provides a top connection for the second filter element 20, and provides a direction for the third inlet and outlet 201, effectively preventing the liquid to be purified on both sides of the second filter element 20 and the purified liquid from being connected at the top, further ensuring the filtering effect of the second filter element 20. The fluid filtered by the second filter assembly 20 is gathered in the fourth uniform flow channel 22 and discharged outward through the inner port 431.

[0125] Optionally, the periphery of the second inner end cap 43 is provided with a downward outer flange, and the inner side surface of the outer flange contacts the outer peripheral surface of the second filter element 20. The second inner end cap 43 is provided with an inner flange extending into the fourth uniformly distributed flow channel 22, and the outer peripheral surface of the inner flange contacts the inner peripheral surface of the second filter element 20. The same arrangement of the inner flange and the outer flange makes the connection between the second inner end cap 43 and the second filter element 20 tighter and increases the reliability of the connection. In addition, the liquid sealing effect of the second inner end cap 43 on the end surface of the second filter element 20 can be enhanced, and a foolproof fit can be formed for the second inner end cap 43, which is easy to assemble.

[0126] Specifically, one end surface of the second filter element 20 is glued to the second inner end cover 43, which is not only convenient for assembly, but also convenient for installation of the integrated core. Optionally, the second filter element 20 is sealed and connected to the second inner end cover 43 by a circle of hot melt adhesive.

[0127] Specifically, the first end structure 401 further includes: a first inner end cover 41 , and the other end surface of the second filter element 20 is glued to the first inner end cover 41 .

[0128] One end of the second filter element 20 is plugged into the first pipe 311 through the second inner end cap 43, and the other end of the second filter element 20 is sealed by the first inner end cap 41, and the first inner end cap 41 is very close to the first outer end cap 42, which is equivalent to the other end of the second filter element 20 being supported by the first outer end cap 42. In this way, the position of the second filter element 20 is also basically fixed, and the assembly step only requires the process of plugging in one end, which shows that its assembly is very simple and time-saving. Moreover, as long as the housing 300 is not deformed, the two ends of the second filter element 20 will not fall out, which shows that the assembly reliability of the second filter element 20 is high.

[0129] In some examples, such as Figure 3 As shown, the inner peripheral wall of the first bottle cap 310 of the housing 300 is provided with a first connecting pipe 311 and a second connecting pipe 312, the inner port 431 of the second inner end cap 43 is plug-connected with the first connecting pipe 311, and the outer port 441 of the second outer end cap 44 is plug-connected with the second connecting pipe 312. This plug-connection assembly method makes it very easy to fix the first filter element 10 and the second filter element 20 in the housing 300.

[0130] exist Figure 3 In the example of , a fifth inserting tube 432 is formed on the second inner end cover 43, and the tube mouth of the fifth inserting tube 432 forms the inner port 431. The fifth inserting tube 432 can be inserted into the first connecting tube 311, or the fifth inserting tube 432 can be inserted outside the first connecting tube 311. To improve the sealing effect, a sealing ring is provided between the fifth inserting tube 432 and the first connecting tube 311.

[0131] In some specific examples, all parts in the first accommodating chamber 100 are pre-assembled into an integrated piece, that is, the first filter element 10, the second filter element 20, the first inner end cover 41, the first outer end cover 42, the second inner end cover 43, the second outer end cover 44, and the second middle end cover 45 are pre-connected into a front and rear integrated filter element. Even the sealing rings at the first connecting pipe 311, the second connecting pipe 312, and the third connecting pipe 313 can also be pre-assembled on the fifth insert pipe 432, the sixth insert pipe 442, and the seventh insert pipe 452.

[0132] Such a front and rear integrated filter element can be directly inserted between the transition plate 3003 and the first bottle cap 310 during assembly, greatly simplifying the assembly process of the whole machine. Moreover, if the first bottle cap 310 is detachably connected to the bottle body 3002, the user can also replace the front and rear integrated filter element (the filter element assembly in the low-pressure area) by himself after use, and the operation steps for the user to replace it by himself are also very easy, which improves the user's experience of changing the element and reduces the cost of changing the element.

[0133] Alternatively, if Figure 3 As shown, the tops of the second middle end cover 45, the second inner end cover 43, and the second outer end cover 44 are flush, which is beneficial for the first bottle cap 310 to seal the top of the first receiving cavity 100.

[0134] In some embodiments of the present invention, Figure 1 , Figure 3 As shown, the third filter element 30 is disposed in the second accommodating chamber 200 as a part of the second filter group 2001, that is, the third filter element 30 is located in the high pressure area 2002. Here, the third filter element 30 can further increase the overall filtering function of the composite filter element assembly 1000 and improve the quality of the output water.

[0135] Optionally, high pressure region 2002 (eg Figure 3 , Figure 4 The higher water pressure here is beneficial to the filtration of the third filter element 30, speeding up the water flow through the membrane, and providing more possibilities for the material selection of the third filter element 10, thereby enhancing the filtration capacity of the third filter element 30.

[0136] In some embodiments of the present invention, Figure 1 As shown, the housing 300 is provided with a fourth inlet and outlet 302 and a fifth inlet and outlet 301. When the fourth inlet and outlet 302 is the water inlet of the third filter element 30, the fifth inlet and outlet 301 is the water outlet of the third filter element 30; conversely, when the fourth inlet and outlet 302 is the water outlet of the third filter element 30, the fifth inlet and outlet 301 is the water inlet of the third filter element 30.

[0137] Optionally, the third filter element 30 is formed in a cylindrical shape, and a fifth uniformly distributed flow channel 31 is defined between the third filter element 30 and the inner wall of the second accommodating chamber 200, the fourth inlet and outlet 302 are connected to the fifth uniformly distributed flow channel 31, and the center of the third filter element 30 is arranged opposite to the transition port 3004. Different uniformly distributed flow channels are formed on the inner and outer sides of the cylindrical third filter element 30, one for the fluid to be purified by the third filter element 30, and the other for the fluid purified by the third filter element 30, wherein the flow cavity in the middle of the third filter element 30 is connected to the transition port 3004.

[0138] From the layout of the third filter element 30 and the fifth uniformly distributed flow channel 31, when the water flows through the third filter element 30, most of it flows along the radial direction of the third filter element 30, with a short path and a large flow rate. Moreover, when passing through radially, it has a flushing effect on the impurities on the surface of the filter element, and the water flow is more likely to flush away the impurities and pass through the filter element. When the filter element is filled with water, most of the water flows basically along the axial direction, which is not only conducive to the uniform distribution of the water flow, but also conducive to bringing the flushed impurities to one end of the axial direction to avoid the impurities being blocked on the surface of the filter element.

[0139] In some examples of the present invention, Figure 1 , Figure 3 As shown, the composite filter element assembly 1000 also includes a central tube 33 , which is disposed in the center of the third filter element 30 . A filtered water inlet hole is disposed on the tube wall of the central tube 33 . The central tube 33 may contain pure water filtered by the third filter element 30 .

[0140] like Figure 1 , Figure 2 , Figure 3 As shown, a fifth inlet and outlet 301 is provided on the shell 300, and a wastewater manifold 34 is provided in the center of the third filter element 30. The wastewater manifold 34 is connected to the fifth inlet and outlet 301, and the wastewater manifold 34 can discharge waste liquid with a higher ion concentration.

[0141] The present invention stipulates that the features of "first", "second", "third", "fourth" and "fifth" may explicitly or implicitly include one or more of the features, which are used to distinguish and describe the features, without any order or importance.

[0142] In some specific embodiments, Figure 1 As shown, the second filtration group 2001 includes: a reverse osmosis membrane element, the reverse osmosis membrane element includes: a central tube group and a plurality of reverse osmosis membrane bags 32, the central tube group includes a central tube 33 and a plurality of wastewater headers 34 spaced apart, the plurality of wastewater headers 34 are arranged around the central tube 33, a filtered water inlet hole is provided on the tube wall of the central tube 33, and a wastewater inlet hole is provided on the tube wall of the wastewater header 34.

[0143] The reverse osmosis membrane element described below is described based on the structure of a spiral-wound reverse osmosis membrane element.

[0144] like Figure 14-16 As shown, the reverse osmosis membrane bag 32 includes multiple groups of spirally wound filter membranes. The reverse osmosis membrane bag 32 has a first portion located inside the central tube group and a second portion located outside the central tube group. Each wastewater header 34 and the central tube 33 are separated by at least one first portion of the reverse osmosis membrane bag 32. The second portions of the multiple reverse osmosis membrane bags 32 form a multi-layer membrane assembly surrounding the central tube group. The multi-layer membrane assembly is a cylinder rolled out of multiple reverse osmosis membrane bags 32, which constitutes the third filter element 30.

[0145] The water entering the second accommodation chamber 200 from the fourth inlet and outlet 302 is filtered by the reverse osmosis membrane bag 32 and then flows to the filtered water inlet hole. The wastewater manifold 34 is connected to the fifth inlet and outlet 301 , and the central pipe 33 is connected to the transition port 3004 .

[0146] The water flowing from the fourth inlet and outlet 302 to the fifth uniform flow channel 31 passes through the reverse osmosis membrane bag 32 in the radial direction and flows toward the central tube group. During the flow, water molecules continuously penetrate into the reverse osmosis membrane bag 32. Part of the pure water that penetrates into the reverse osmosis membrane bag 32 continues to flow toward the central tube 33 in the radial direction, and part of it flows toward the central tube 33 in the spiral direction under the influence of the membrane extension direction. Finally, the pure water enters the central tube 33 from the filtered water inlet hole and then flows toward the transition port 3004. The water that has not penetrated into the reverse osmosis membrane bag 32 is concentrated in the wastewater manifold 34, and the remaining wastewater flows to the wastewater collection holes on the tube wall of the wastewater manifold 34. The wastewater manifold 34 is connected to the fifth inlet and outlet 301, and the wastewater is discharged from the fifth inlet and outlet 301.

[0147] The reverse osmosis membrane element adopts a side-flow water-saving membrane, and the side-flow water inlet increases the flow rate on the membrane surface, thereby ensuring a high pure water recovery rate and a long service life of the reverse osmosis membrane bag 32.

[0148] Optionally, the third filter element 30 may also be an ultrafiltration membrane assembly, and specifically, an ultrafiltration membrane filter element available on the market may be used. The principles and techniques of ultrafiltration and reverse osmosis filtration are both prior arts well known to those skilled in the art, and will not be described in detail in the present invention. In addition, when the third filter element 30 adopts the above-mentioned filter element, the liquid needs to be pressurized in advance and then pumped into the fourth inlet and outlet 302.

[0149] In some embodiments of the present invention, at least one circle of fixed axis protrusions are provided on the outer circumference of the first filter group 1001 and the second filter group 2001, and the multiple fixed axis protrusions of each circle are respectively stopped on the inner wall of the housing 300. The fixed axis protrusions of the first filter group 1001 are not shown. The fixed axis protrusions of the second filter group 2001 are respectively provided on the third end structure 47 and the fourth end structure 48. For the convenience of description, the fixed axis protrusions on the third end structure 47 are described as the first fixed axis protrusions 474, and the fixed axis protrusions on the fourth end structure 48 are described as the second fixed axis protrusions 484.

[0150] The fixed axis protrusion is provided so that when the bottle cap 3001 rotates relative to the bottle body 3002 , the fixed axis protrusion has an aligning effect on the filter group, thereby ensuring the coaxiality of the filter group and the bottle body 3002 .

[0151] In some embodiments of the present invention, the two axial ends of the reverse osmosis membrane element are connected to the third end structure 47 and the fourth end structure 48 respectively. The third end structure 47 and the fourth end structure 48 are plugged into the transition plate 3003 and the bottle cap 3001 respectively. The third end structure 47 and the fourth end structure 48 close the two ends of the reverse osmosis membrane element, so that the water between different flow channels of the reverse osmosis membrane element does not flow through or interfere with each other, thereby ensuring the filtering effect of the reverse osmosis membrane element. By plugging into the transition plate 3003 and the bottle cap 3001 (such as Figure 1 , Figure 2 The second bottle cap 320 in the embodiment of the present invention makes it easy to assemble the reverse osmosis membrane element, and the assembly structure is stable to prevent it from being skewed during long-term use.

[0152] Specifically, Figure 1 , Figure 3 As shown, the third end structure 47 is matched on the end surface of the third filter element 30 facing the transition port 3004, and the two ends of the third end structure 47 are provided with a second insert pipe 471 and a third insert pipe 472 that communicate with each other, the second insert pipe 471 is inserted into the transition port 3004, and the third insert pipe 472 is connected to the central tube 33. Here, the third end structure 47 closes the top of the third filter element 30 and provides a top support connection for the third filter element 30, effectively preventing the liquid to be purified and the purified liquid on both sides of the third filter element 30 from being connected at the top.

[0153] Among them, the third end structure 47 is inserted into the transition port 3004 through the second insert tube 471. On the one hand, it is convenient for sealing to prevent the high-pressure water in the second accommodating chamber 200 from flowing to the transition port 3004 without being filtered by the reverse osmosis membrane bag 32. On the other hand, the transition port 3004 is used for positioning, which improves the positioning accuracy and reduces the difficulty of assembly.

[0154] The third end structure 47 is plugged into the central tube 33 through the third insert tube 472. On the one hand, sealing is achieved by utilizing the surface contact between the third insert tube 472 and the wall of the central tube 33. On the other hand, it facilitates the positioning and installation of the central tube 33 to prevent the central tube 33 from tilting or leaking after long-term use.

[0155] In addition, if Fig.11 As shown, a first positioning protrusion 473 is provided on the third end structure 47, and the first positioning protrusion 473 is arranged corresponding to the wastewater collection pipe 34. One end of the wastewater collection pipe 34 is inserted into the first positioning protrusion 473. This first positioning protrusion 473 has a certain fool-proof matching function, which facilitates the positioning and installation of the third end structure 47 and the wastewater collection pipe 34 and prevents the wastewater collection pipe 34 from being skewed after long-term use.

[0156] Alternatively, if Fig.10 , Fig.11 As shown, a first fixed-axis protrusion 474 is provided on the peripheral wall of the third end structure 47, and a plurality of first fixed-axis protrusions 474 are arranged at intervals along the circumferential direction. The plurality of first fixed-axis protrusions 474 abut against the inner wall of the shell 300, thereby improving the centering degree of the third filter element 30 in the second accommodating cavity 200 and preventing the third filter element 30 from being skewed as a whole and thus failing to fit well at the transition port 3004.

[0157] Advantageously, a sealing ring is provided between the second insert pipe 471 and the transition opening 3004 .

[0158] In some embodiments of the present invention, Figure 1 , Figure 3 , Fig.12 , Fig.13 As shown, the fourth end structure 48 of the composite filter element assembly 1000 is fitted on the end face of the third filter element 30 away from the transition port 3004, and the fourth end structure 48 is provided with a waste outlet 482 respectively connected to the wastewater manifold 34 and the fifth inlet and outlet 301.

[0159] In addition, if Fig.13 As shown, a second positioning protrusion 483 is protruded from the middle of the fourth end structure 48, and the second positioning protrusion 483 is arranged corresponding to the center tube 33. One end of the center tube 33 is inserted into the second positioning protrusion 483. This second positioning protrusion 483 has a blocking function and also has a certain fool-proof matching function, which facilitates the positioning and installation of the fourth end structure 48 and the center tube 33 to prevent the center tube 33 from tilting during long-term use, and can close the lower part of the center tube 33 to prevent the liquid in the center tube 33 from flowing out.

[0160] Alternatively, if Fig.12 , Fig.13As shown, a second fixed-axis protrusion 484 is provided on the peripheral wall of the fourth end structure 48, and a plurality of second fixed-axis protrusions 484 are arranged at intervals along the circumferential direction. The plurality of second fixed-axis protrusions 484 abut against the inner wall of the shell 300, thereby improving the centering degree of the third filter element 30 in the second accommodating cavity 200 and preventing the third filter element 30 from being skewed as a whole and thus failing to fit well at the fifth inlet and outlet 301.

[0161] exist Figure 1 In the embodiment, the fourth end structure 48 seals the bottom of the third filter element 30 and the central tube 33, and provides a bottom seal and support for the third filter element 30, effectively preventing the liquid to be purified and the purified liquid on both sides of the third filter element 30 from mixing at the bottom, thereby ensuring the filtering effect of the third filter element 30. The wastewater manifold 34 connects the waste outlet 482 and the fifth inlet and outlet 301, so that the high-salinity wastewater flows out of the housing 300 quickly enough.

[0162] In some examples of the present invention, Figure 1 As shown, a fourth connecting pipe 321 is provided on the inner peripheral wall of the housing 300. Figure 5 The fourth connecting pipe 321 is provided on the second bottle cap 320, and the fourth connecting pipe 321 is connected to the fifth inlet and outlet 301. The fourth end structure 48 is provided with a fourth inserting pipe 481, and the fourth inserting pipe 481 is plugged and connected with the fourth connecting pipe 321. The plugging connection between the fourth inserting pipe 481 and the fourth connecting pipe 321 ensures that there is no cross-flow between the high-concentration waste liquid and the liquid to be purified. In addition, it ensures that the fourth end structure 48 is stably connected to the bottom of the housing 300 to prevent the third filter element 30 from changing its position during the filtering process.

[0163] Optionally, a sealing ring is provided between the fourth inserting tube 481 and the fourth connecting tube 321 to improve the sealing degree.

[0164] In some specific examples, all parts in the second accommodating chamber 200 are pre-assembled into an integrated piece, that is, the central tube 33, the wastewater header 34, the reverse osmosis membrane bag 32, the third end structure 47, and the fourth end structure 48 are pre-connected to form an integrated reverse osmosis membrane filter element. Even the sealing rings at the transition port 3004 and the fourth connecting pipe 321 can be pre-assembled on the second insert pipe 471 and the fourth insert pipe 481.

[0165] Such an integrated reverse osmosis membrane filter element can be directly inserted between the transition plate 3003 and the second bottle cap 320 during assembly, greatly simplifying the assembly process of the whole machine. Moreover, if the second bottle cap 320 is detachably connected to the bottle body 3002, the user can also replace the integrated reverse osmosis membrane filter element by himself after use, and the operation steps for the user to replace it by himself are also very easy, which improves the user's experience of replacing the element and reduces the cost of replacing the element.

[0166] In some examples of the present invention, the first filter element 10 is a roll made of non-woven fabric, polypropylene layer, and carbon fiber, and has a long service life. When used for filtering tap water, it can initially remove sediment, rust, and residual chlorine. Of course, the first filter element 10 can also be made of only one or two filter layers of the materials, and there is no specific limitation here.

[0167] In some examples of the present invention, the second filter element 20 is a hollow carbon rod. It can be used for the final filtration of tap water. The carbon rod can filter out odors, organic matter, colloids, iron and residual chlorine in the water, so that the second filter element 20 can control the water quality of the drinking water after the water is discharged and improve the taste. Of course, the second filter element 20 can also be composed of activated carbon particles, a filter screen and a frame, and is not limited to the setting form of the carbon rod. In addition, the carbon filter medium can also be replaced with a KDF55 treatment medium (high-purity copper / zinc alloy medium) to remove residual chlorine in the water through electrochemical reactions, reduce mineral scaling, reduce suspended solids such as ferrous oxide, inhibit microorganisms, and remove heavy metals.

[0168] In some embodiments of the present invention, Figure 4 , Figure 8 As shown, when a bottle cap 3001 is connected to a bottle body 3002 by a spin welding structure 400, a non-circular spin welding fixture fixing boss 3005 is provided on the surface of a transition plate 3003 on the opposite side of another bottle cap 3001. For example, the non-circular shape can be a polygonal structure such as a hexagon, a pentagon, or a quadrilateral. When the bottle cap 3001 needs to be spin-welded to the bottle body 3002, the spin welding fixture fixing boss 3005 can be positioned and connected with an external fixed fixture, so that the bottle body 3002 does not rotate relative to the fixed fixture, so that the bottle body 3002 and the fixed fixture do not rotate during the spin welding process, and the spin welding process is relatively stable.

[0169] like Figure 1 , Figure 3 , Figure 4 , Figure 8 , Fig. 9 As shown, when both bottle caps 3001 are connected to the bottle body 3002 through the spin welding structure 400, a non-circular spin welding fixture fixing boss 3005 is provided on at least one side surface of the transition plate 3003. This facilitates keeping the bottle body 3002 in a fixed position when welding the end cap 3001 at one end to the bottle body 3002 to prevent the bottle body 3002 from rotating.

[0170] To better understand the solution of the embodiment of the present invention, Figure 1-Figure 16 The structure of a composite filter element assembly 1000 in a specific embodiment of the present invention is described.

[0171] The following specific embodiments use the purification of tap water as an example to describe the three-stage filtration function of the composite filter element assembly 1000, and illustrate the highly integrated one-piece design structure of the composite filter element assembly 1000. In addition, the first filter element 10 in the first filter group 1001 is described as a roll-type primary filter element rolled up with non-woven fabric, polypropylene layer, carbon fiber and spacer bracket 49; the third filter element 30 in the second filter group 2001 is described as an example of a highly water-saving side-flow reverse osmosis water-saving membrane as an intermediate filter. The second filter element 20 in the first filter group 1001 is described as an example of a cylindrical hollow carbon rod as a final filter.

[0172] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a composite filter element assembly 1000 is installed in a vertical state under normal conditions. It includes a housing 300, which includes a bottle body 3002 with two open ends and a first bottle cap 310 and a second bottle cap 320 sealed at both ends. Each bottle cap 3001 is sealed and connected to the bottle body 3002 through a spin welding structure 400. Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the spin welding structure 400 includes a bevel welding area 410 with a circumferential surface of a truncated cone, and the first bottle cap 310 and the second bottle cap 320 are respectively provided with a spin welding overflow groove 420 at the end of the bevel welding area 410, and an inner flange 430 that cooperates with the inner circumferential surface of the bottle body 3002 is provided at the starting end of the bevel welding area 410.

[0173] The first bottle cap 310 is provided with a first inlet and outlet 101 for tap water, a second inlet and outlet 102 for pre-water discharge, and a third inlet and outlet 201 for drinking water discharge. The first bottle cap 310 extends to the side to form a handle 314, and the first inlet and outlet 101, the second inlet and outlet 102, and the third inlet and outlet 201 are all arranged on one side close to the handle 314. The second bottle cap 320 is provided with a fourth inlet and outlet 302 for pre-water inlet of reverse osmosis, and a fifth inlet and outlet 301 for high-salinity wastewater discharge of reverse osmosis.

[0174] like Figure 1 As shown, the interior of the housing 300 is integrally formed with a transition plate 3003 arranged perpendicular to the cylinder wall. The transition plate 3003 separates the housing 300 in the axial direction to form the first accommodating cavity 100 and the second accommodating cavity 200. A transition opening 3004 is axially provided in the middle of the transition plate 3003. The first accommodating cavity 100 and the second accommodating cavity 200 are connected through the transition opening 3004. Figure 8 , Fig. 9As shown, the transition opening 3004 protrudes outward to form a non-circular spin welding fixture fixing boss 3005, and the transition opening 3004 is a circular through hole.

[0175] like Figure 1 As shown, the first filter group 1001 includes a first filter element 10, a second filter element 20 and a waterway partition plate 46. The waterway partition plate 46 is connected to the first end structure 401 and the second end structure 402 respectively to partition the first accommodating chamber 100 into a first low-pressure area 1002 and a second low-pressure area 1003. The first filter element 10 is arranged in the first low-pressure area 1002. The water flowing in from the first inlet and outlet 101 flows out from the second inlet and outlet 102 after passing through the first filter element 10. The second filter element 20 is arranged in the second low-pressure area 1003. The water flowing in from the transition port 3004 flows out from the third inlet and outlet 201 after passing through the second filter element 20. Further, two sets of filter units are formed in the first accommodating chamber 100, that is, the first filter element 10 with a cylindrical shape arranged in the center of the first accommodating chamber 100 is used as a primary filter unit, and the second filter element 20 arranged outside the first accommodating chamber 100 is used as a final filter unit. The axial length of the first filter element 10 is greater than the axial length of the second filter element 20. The first filter element 10 and the second filter element 20 are separated by a cylindrical waterway partition plate 46. An annular first uniform flow channel 11 is defined between the first filter element 10 and the inner wall of the first accommodating chamber 100. Figure 1 As shown, the first uniform flow channel 11 is connected to the first inlet and outlet 101. An annular second uniform flow channel 12 is defined between the waterway partition plate 46 and the first filter element 10, and the second uniform flow channel 12 is connected to the second inlet and outlet 102. An annular third uniform flow channel 21 is defined between the waterway partition plate 46 and the second filter element 20, and a cylindrical fourth uniform flow channel 22 is provided on a side of the second filter element 20 away from the third uniform flow channel 21. The third uniform flow channel 21 is connected to the transition port 3004, and the fourth uniform flow channel 22 is connected to the third inlet and outlet 201.

[0176] like Figure 1 , Figure 3As shown, the second filter element 20 is provided with a second inner end cap 43 at the upper end, and the second filter element 20 is provided with a first inner end cap 41 at the lower end. The first inner end cap 41 is matched with the axial end face of the second filter element 20 facing the transition port 3004 to block the second filter element 20 and the fourth uniform flow channel 22; the second inner end cap 43 is matched with the axial end face of the second filter element 20 away from the transition port 3004 to block the second filter element 20, and the second inner end cap 43 is provided with an inner port 431 connected to the third inlet and outlet 201. The first filter element 10 is provided with a second outer end cap 44 at the upper end, and the second outer end cap 44 is provided with an outer port 441 which is covered with the inner port 431; the first filter element 10 is provided with a first outer end cap 42 on the axial end face facing the transition port 3004. The first outer end cap 42 is integrally formed with a waterway partition plate 46, and the first outer end cap 42 blocks the lower part of the first filter element 10 and the third uniform flow channel 21. A second middle end cover 45 is sleeved between the second outer end cover 44 and the second inner end cover 43. The second middle end cover 45 is fitted on the peripheral wall of the waterway partition plate 46. A middle port 451 is formed on the second middle end cover 45. A sealing member is provided between the second middle end cover 45 and the third connecting pipe 313, and a sealing member is provided between the second inner end cover 43 and the first connecting pipe 311.

[0177] like Figure 3 As shown, a first connecting pipe 311 is provided on the inner circumferential wall of the housing 300 toward the second inner end cover 43, a second connecting pipe 312 is provided on the inner circumferential wall of the housing 300 toward the second outer end cover 44, a third connecting pipe 313 is provided on the inner circumferential wall of the housing 300 toward the second middle end cover 45, and a middle port 451 of the second middle end cover 45 is plug-connected with the third connecting pipe 313. A passage connecting the second inlet and outlet 102 is formed between the third connecting pipe 313 and the second outer end cover 44.

[0178] like Figure 1 , Fig.14 , Fig.15 , Fig.16 As shown, the second filter group 2001 is arranged in the second accommodating chamber 200, and the second filter group 2001 includes a third filter element 30, and the cylindrical third filter element 30 is arranged in the second accommodating chamber 200. A fifth uniformly distributed flow channel 31 is defined between the third filter element 30 and the inner wall of the second accommodating chamber 200, and a central tube 33 in the center of the third filter element 30 is arranged opposite to the transition port 3004. A filter water inlet hole is arranged on the tube wall of the central tube 33, and the third filter element 30 is composed of a plurality of reverse osmosis membrane bags 32, and the reverse osmosis membrane bags 32 have a first part and a second part. Each wastewater header 34 and the central tube 33 are separated by the first part of at least one reverse osmosis membrane bag 32, and the second parts of the plurality of reverse osmosis membrane bags 32 are formed around the tube group composed of the central tube 33 and the plurality of wastewater headers 34, forming a multi-layer spiral wound membrane assembly.

[0179] like Figure 3, Fig.14 , Fig.15 As shown, the central tube 33 is annular and is provided with five wastewater headers 34, each wastewater header 34 passes through the second end cover 320 and is connected to the fifth inlet and outlet 301. Each wastewater header 34 corresponds to a reverse osmosis membrane bag 32.

[0180] like Figure 1 , Figure 3 , Fig.10 As shown, the third end structure 47 and the fourth end structure 48 are respectively provided at both ends of the third filter element 30. The third end structure 47 is sealed at one end of the third filter channel 32 and the waste water circulation cavity facing the first accommodation cavity 100, and the fourth end structure 48 is sealed at one end of the third filter channel 32 and the filtered water circulation cavity away from the first accommodation cavity 100. The second insert pipe 471 and the third insert pipe 472 are provided at both ends of the third end structure 47. The second insert pipe 471 is inserted into the transition port 3004, and the third insert pipe 472 is connected to the central pipe 33. The third end structure 47 is provided with a first positioning protrusion 473 that is foolproofly matched with the waste water pipe 34. The peripheral wall of the third end structure 47 is provided with a first fixed axis protrusion 474 that is matched and assembled with the top of the third filter element 30. The fourth end structure 48 is provided with a waste outlet 482 connected to the waste water header 34. A fourth connecting pipe 321 is provided on the inner peripheral wall of the housing 300 toward the fourth end structure 48, and the fourth connecting pipe 321 is connected to the fifth inlet and outlet 301. A fourth inserting pipe 481 is provided on the fourth end structure 48, and the fourth inserting pipe 481 is plugged and connected to the fourth connecting pipe 321. A second positioning protrusion 483 is provided on the fourth end structure 48 to seal with the central pipe 33. A second fixed axis protrusion 484 is provided on the peripheral wall of the fourth end structure 48 to fit with the bottom of the third filter element 30. A sealing ring is added between the third end structure 47 and the first outer end cover 42. A sealing ring is added between the first outer end cover 42 and the transition port 3004.

[0181] The entire tap water filtering process is that the tap water enters the first uniform flow channel 11 from the first inlet and outlet 101, flows radially inward, flows to the second uniform flow channel 12 after being filtered by the first filter element 10, and flows out from the upper second inlet and outlet 102 as pre-water. The pre-water after flowing out is pressurized and pumped into the fourth inlet and outlet 302, and is evenly distributed in the fifth uniform flow channel 31, flows in from the side of the side flow reverse osmosis water-saving membrane and is filtered by the third filter element 30, the high-salinity wastewater is collected by the wastewater header 34 and discharged from the fifth inlet and outlet 301, and the pure water is collected upward by the central tube 33 and passes through the transition port 3004. The pure water enters the third uniform flow channel 21 from the transition port 3004, is filtered radially by the second filter element 20, enters the fourth uniform flow channel 22, and flows out from the third inlet and outlet 201 for drinking.

[0182] In the description of the present invention, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "top", "bottom", "inside", "outside", "axial", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0183] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0184] Other components of the composite filter element assembly 1000 according to the embodiment of the present invention, such as the filtering function of each filter component, the material selection of each filter component, and the arrangement order of each filter component, are known to ordinary technicians in the field and will not be described in detail here.

[0185] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0186] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A composite filter element assembly, characterized in that: include: A shell, the shell comprising a bottle body, two bottle caps and a transition plate, the two ends of the bottle body are open, the transition plate is arranged in the bottle body, the two bottle caps are respectively sealed and connected to the two ends of the shell, a first accommodating cavity is defined between the bottle body and the transition plate and one of the bottle caps, a second accommodating cavity is defined between the bottle body and the transition plate and the other of the bottle caps, and a transition port is provided on the transition plate; A first filter group, wherein the first filter group is disposed in the first accommodating chamber; The second filter group is arranged in the second accommodating chamber. After the water in the second accommodating chamber is filtered by the second filter group, it flows to the first accommodating chamber through the transition port; wherein, At least one of the bottle caps is connected to the bottle body by a spin welding structure; both of the bottle caps are spin welded to the bottle body, and The first filter group is provided with a first end structure and a second end structure at both ends, the first filter group is connected to the transition plate and the bottle cap through the first end structure and the second end structure, the first end structure is rotatable relative to the transition plate, and the second end structure is rotatable relative to the bottle cap; The second filter group is provided with a third end structure and a fourth end structure at both ends, and the second filter group is connected to the transition plate and the bottle cap through the third end structure and the fourth end structure, respectively. The third end structure is rotatable relative to the transition plate, and the fourth end structure is rotatable relative to the bottle cap. The housing is provided with a first inlet and outlet, a second inlet and outlet, and a third inlet and outlet. The first filter group includes a first filter element, a second filter element and a waterway partition plate. The waterway partition plate is respectively connected to the first end structure and the second end structure to separate the first accommodating chamber into a first low-pressure area and a second low-pressure area. The first filter element is arranged in the first low-pressure area. Water flowing in from the first inlet and outlet flows out from the second inlet and outlet after passing through the first filter element. The second filter element is arranged in the second low-pressure area. Water flowing in from the transition port flows out from the third inlet and outlet after passing through the second filter element. The third filter element is arranged in the second accommodating chamber as a part of the second filter group. The third filter element is located in the high-pressure area.

2. The composite filter element assembly according to claim 1, characterized in that: The portion where the end surface of the bottle body contacts the end surface of the bottle cap comprises a bevel welding area, the bevel welding area is a circular ring arranged around the central axis of the bottle body, and the bevel welding area is a circumferential surface of a truncated cone.

3. The composite filter element assembly according to claim 2, characterized in that: At least one of the end surface of the bottle body and the end surface of the bottle cap is provided with a spin welding overflow groove, and the spin welding overflow groove is located radially outside the inclined surface welding area.

4. The composite filter element assembly according to claim 3, characterized in that: The spin welding overflow groove and the inner flange are provided on one of the bottle body and the bottle cap, and the inner flange is matched with the inner circumferential surface of the other one of the bottle body and the bottle cap.

5. The composite filter element assembly according to claim 1, characterized in that: The waterway partition plate is cylindrical, the second filter element is located on the inner side of the waterway partition plate, the first filter element is jacketed on the outer side of the waterway partition plate, and both ends of the first filter element and both ends of the second filter element are sealed by the first end structure and the second end structure.

6. The composite filter element assembly according to claim 1, characterized in that: The housing is provided with a fourth inlet and a fifth inlet. The second filtration group comprises: a reverse osmosis membrane element, the reverse osmosis membrane element comprises: a central tube group and a plurality of reverse osmosis membrane bags, the central tube group comprises a central tube and a plurality of wastewater headers arranged at intervals, the plurality of wastewater headers are arranged around the central tube, a filter water inlet hole is arranged on the tube wall of the central tube, and a wastewater inlet hole is arranged on the tube wall of the wastewater header; The reverse osmosis membrane bag has a first portion located inside the central tube group and a second portion located outside the central tube group, each of the wastewater headers and the central tube is separated by at least one first portion of the reverse osmosis membrane bag, and the second portions of a plurality of the reverse osmosis membrane bags form a multi-layer membrane assembly surrounding the central tube group; wherein, The water entering the second containing chamber from the fourth inlet and outlet flows to the filtered water inlet hole after being filtered by the reverse osmosis membrane bag. The wastewater header is connected to the fifth inlet and outlet, and the central pipe is connected to the transition port.

7. The composite filter element assembly according to claim 6, characterized in that: The two axial ends of the circular cylinder rolled out of the reverse osmosis membrane bag are glued to the third end structure and the fourth end structure.

8. The composite filter element assembly according to claim 1, characterized in that: When one of the bottle caps is connected to the bottle body through a spin welding structure, a non-circular spin welding fixture fixing boss is provided on the surface of the transition plate on the opposite side of the other bottle cap; When the two bottle caps are connected to the bottle body through the spin welding structure, a non-circular spin welding fixture fixing boss is provided on at least one side surface of the transition plate.

9. The composite filter element assembly according to claim 1, characterized in that: At least one circle of fixed-axis protrusions is disposed on the outer circumference of the first filter group and the second filter group, and a plurality of fixed-axis protrusions in each circle are respectively stopped on the inner wall of the shell.

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