Composite filter element and water purification device

Abstract

The application discloses a composite filter element and a water purification equipment, and relates to the technical field of water purification, wherein the composite filter element comprises a filter bottle, a filter bottle cover, a separation cylinder, a reverse osmosis filtering assembly and a replaceable filter element assembly; the separation cylinder is arranged in the filter bottle and forms a first filtering cavity and a second filtering cavity which are separated from each other; the reverse osmosis filtering assembly is arranged in the first filtering cavity; and the replaceable filter element assembly is detachably arranged in the second filtering cavity; the replaceable filter element assembly comprises a shell and a filter element assembly arranged in the shell; a rear water inlet is arranged on the shell; a reverse osmosis water outlet which is in communication with the second filtering cavity is further arranged at the bottom of the separation cylinder; and the reverse osmosis water outlet and the rear water inlet are in plug-in communication. The composite filter element can solve the technical problem that impurities and solid particles filtered by the replaceable filter element assembly will be left on the cavity wall after the replaceable filter element assembly is detached from the filtering cavity of the composite filter element.

Description

Technical Field

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

[0002] In related technologies, integrated composite filter cartridges for water purification equipment consist of two parts: a filter cartridge body and a replaceable filter cartridge assembly. The filter cartridge body integrates a reverse osmosis filter cartridge, while the replaceable filter cartridge assembly integrates a post-filter cartridge or a pre- and post-filter cartridge. The replaceable filter cartridge assembly is detachable from the filter cartridge body for easy replacement. However, because the reverse osmosis filter cartridge and the post-filter cartridge are directly connected through water holes in the chamber wall, after the replaceable filter cartridge assembly is removed from the chamber of the filter cartridge body, impurities and solid particles filtered by the filter cartridge will remain on the chamber wall. This requires cleaning before replacing with a new replaceable filter cartridge assembly, which is cumbersome and easily contaminates the filter cartridge. Summary of the Invention

[0003] The main objective of this invention is to propose a composite filter element and water purification device, which aims to solve the technical problem that after the replaceable filter element assembly is removed from the composite filter element filtration chamber, impurities and solid particles filtered by the filter element will remain on the chamber wall.

[0004] To achieve the above objectives, the present invention proposes a composite filter element, comprising a filter bottle, a filter bottle cap, a separator, a reverse osmosis filtration assembly, and a replaceable filter element assembly. The filter bottle cap covers the filter bottle and has a reverse osmosis inlet, a wastewater outlet, and an installation port. The separator is disposed within the filter bottle, forming a first filtration chamber and a second filtration chamber that are isolated from each other. The first filtration chamber is located on the outer periphery of the second filtration chamber, and the second filtration chamber is positioned corresponding to the installation port. The reverse osmosis filtration assembly includes a reverse osmosis filter element sleeved within the separator, the reverse osmosis filter element being disposed within the first filtration chamber, and the raw water inlet side of the reverse osmosis filter element being connected to the reverse osmosis inlet. The wastewater outlet side of the reverse osmosis filter element is connected to the wastewater port; the replaceable filter element assembly is detachably installed in the second filtration chamber through the mounting port; the replaceable filter element assembly includes a housing and a filter element assembly, the filter element assembly is disposed in the housing, the housing has a rear inlet and a rear outlet located at both ends of the length direction of the housing, and both the rear inlet and the rear outlet are connected to the filter element assembly; wherein, the bottom of the separator cylinder is also provided with a reverse osmosis outlet connected to the second filtration chamber, the reverse osmosis outlet is connected to the pure water outlet side of the reverse osmosis filter element, and the reverse osmosis outlet and the rear inlet are connected by insertion.

[0005] In one embodiment, the filter assembly includes a post-filter element disposed within the housing, with the inlet side of the post-filter element connected to the post-inlet and the outlet side of the post-filter element connected to the post-outlet.

[0006] In one embodiment, the replaceable filter assembly further includes a separator disposed within the housing. The separator includes a partition plate and a central tube. The partition plate is connected to the outer wall of the central tube and is sealed to the housing. The partition plate and the housing form a first cavity and a second cavity that are isolated from each other. The post-filter is disposed in the second cavity and fitted with the central tube.

[0007] In one embodiment, the filter assembly further includes a pre-filter, which is disposed in the first cavity and fitted with the central tube. The housing also has a pre-inlet and a pre-outlet, both of which are located on the side of the housing away from the rear inlet. The pre-inlet is connected to the inlet side of the pre-filter, and the pre-outlet is connected to the outlet side of the pre-filter.

[0008] In one embodiment, the central tube forms a pure water flow channel, one end of which is connected to the rear water inlet through the second cavity, and the other end is connected to the rear water outlet.

[0009] In one embodiment, the central tube includes a first tube portion and a second tube portion located on opposite sides of the partition plate, the pre-filter is fitted with the first tube portion, the post-filter is fitted with the second tube portion, and the wall thickness of the first tube portion is not less than the wall thickness of the second tube portion.

[0010] In one embodiment, the wall thickness of the first tube portion ranges from 1.5 mm to 4 mm, and / or the wall thickness of the second tube portion ranges from 1.5 mm to 3 mm.

[0011] In one embodiment, the partition plate has a first mounting groove on the side facing the first cavity, and the replaceable filter element assembly further includes an upper end cover with an upper locking groove. The two ends of the pre-filter element are respectively disposed in the first mounting groove and the upper locking groove.

[0012] In one embodiment, the water inlet side of the pre-filter element is connected to the pre-inlet, the water outlet side of the pre-filter element is connected to the pre-outlet, and both ends of the pre-filter element are respectively bonded to the first mounting groove and the upper slot.

[0013] In one embodiment, the partition plate has a second mounting groove on the side facing the second cavity, and the replaceable filter element assembly further includes a lower end cover with a lower locking groove. The two ends of the rear filter element are respectively disposed in the second mounting groove and the lower locking groove.

[0014] In one embodiment, the water inlet side of the post-filter element is connected to the post-inlet, the water outlet side of the post-filter element is connected to the pure water flow channel, and both ends of the post-filter element are respectively bonded to the second mounting groove and the lower slot.

[0015] In one embodiment, a water outlet is provided at the end of the central tube near the rear water inlet, and the water outlet side of the rear filter element is connected to the pure water channel through the water outlet.

[0016] In one embodiment, the lower end cover is provided with a protrusion, the central tube is sleeved on the protrusion, and there is a gap between the protrusion and the central tube.

[0017] In one embodiment, the height of the protrusion is higher than the height of the water inlet in the axial direction of the central tube.

[0018] In one embodiment, the bottom of the separator cylinder is provided with a slot, which forms the reverse osmosis outlet. One end of the housing is provided with a plug-in portion, which forms the rear inlet. The plug-in portion and the slot are plugged in to connect the reverse osmosis outlet and the rear inlet.

[0019] In one embodiment, the separator cylinder is provided with a water passage that communicates with the first filter chamber, the slot communicates with the water passage, the water passage extends radially along the separator cylinder and penetrates the separator cylinder, and the slot extends axially along the separator cylinder and forms the reverse osmosis outlet.

[0020] In one embodiment, the water passage is located at the end of the separator cylinder away from the wastewater outlet.

[0021] This invention also proposes a water purification device, which includes the composite filter element. The composite filter element includes a filter bottle, a filter bottle cap, a separator, a reverse osmosis filtration assembly, and a replaceable filter element assembly; the filter bottle cap covers the filter bottle and has a reverse osmosis inlet, a wastewater outlet, and an installation port; the separator is disposed within the filter bottle and forms a first filtration chamber and a second filtration chamber isolated from each other, the first filtration chamber being located on the outer periphery of the second filtration chamber, and the second filtration chamber being disposed corresponding to the installation port; the reverse osmosis filtration assembly includes a reverse osmosis filter element sleeved within the separator, the reverse osmosis filter element being disposed within the first filtration chamber, the raw water inlet side of the reverse osmosis filter element communicating with the reverse osmosis inlet, and the reverse osmosis filter element's... The wastewater outlet is connected to the wastewater port; the replaceable filter element assembly is detachably installed in the second filtration chamber through the mounting port; the replaceable filter element assembly includes a housing and a filter element assembly, the filter element assembly is disposed inside the housing, the housing has a rear inlet and a rear outlet located at both ends of the length direction of the housing, the rear inlet and the rear outlet are both connected to the filter element assembly; wherein, the bottom of the separator cylinder is also provided with a reverse osmosis outlet connected to the second filtration chamber, the reverse osmosis outlet is connected to the pure water outlet side of the reverse osmosis filter element, and the reverse osmosis outlet and the rear inlet are connected by insertion.

[0022] The technical solution of this invention sets the replaceable filter element assembly as an independent detachable component, which has a housing and a rear water inlet and a rear water outlet at both ends of the housing. The filter element assembly is installed inside the housing to filter the water flowing into the housing. When the replaceable filter element assembly is installed into the second filtration chamber inside the filter bottle, the reverse osmosis outlet and the rear water inlet are connected to achieve water flow. Water will not flow in the second filtration chamber. Therefore, when the replaceable filter element assembly is removed from the second filtration chamber, no impurities, solid particles, etc. generated by the composite filter element during operation will remain on the wall of the second filtration chamber. Thus, it is not necessary to clean the wall of the second filtration chamber (i.e., the inner wall of the separator) and the reverse osmosis filter element will not be contaminated. Attached Figure Description

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

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the composite filter element provided by the present invention;

[0025] Figure 2 for Figure 1 Cross-sectional view of a composite filter element;

[0026] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0027] Figure 4 for Figure 1 Exploded view of a composite filter element;

[0028] Figure 5 for Figure 4 A cross-sectional view of the composite filter element in an exploded view.

[0029] Figure 6 This is a schematic diagram of a structure of an embodiment of the replaceable filter assembly provided by the present invention;

[0030] Figure 7 for Figure 6 A cross-sectional view of the replaceable filter element assembly;

[0031] Figure 8 for Figure 7 A magnified view of a section at point B in the middle;

[0032] Figure 9 for Figure 7 A magnified view of a section at point C;

[0033] Figure 10 for Figure 7 Schematic diagram of the middle partition;

[0034] Figure 11 for Figure 10 A sectional view of the middle partition.

[0035] Explanation of icon numbers:

[0036] 1. Composite filter element;

[0037] 10. Replaceable filter cartridge assembly; 20. Filter bottle; 30. Filter bottle cap; 31. Reverse osmosis inlet; 32. Wastewater outlet; 33. Mounting port; 40. Divider cylinder; 41. First filtration chamber; 42. Second filtration chamber; 43. Reverse osmosis outlet; 44. Water flow channel; 50. Reverse osmosis filter assembly; 51. Reverse osmosis filter cartridge;

[0038] 100. Housing; 110. Front water inlet; 120. Front water outlet; 130. Rear water inlet; 140. Rear water outlet;

[0039] 200, Separator; 210, Middle partition; 211, First mounting groove; 212, Second mounting groove; 213, Sealing groove; 220, Central pipe; 220a, Pure water flow channel; 221, First pipe section; 222, Second pipe section; 223, Water outlet;

[0040] 310. First cavity; 320. Second cavity;

[0041] 400. Filter element assembly; 410. Pre-filter; 420. Post-filter;

[0042] 510. Upper end cover; 511. Upper slot; 520. Lower end cover; 521. Lower slot; 522. Protrusion;

[0043] 600. Sealing components.

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0047] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0048] In related technologies, integrated composite filter cartridges for water purification equipment consist of two parts: a filter cartridge body and a replaceable filter cartridge assembly. The filter cartridge body integrates a reverse osmosis filter cartridge, while the replaceable filter cartridge assembly integrates a post-filter cartridge or a pre- and post-filter cartridge. The replaceable filter cartridge assembly is detachable from the filter cartridge body for easy replacement. However, because the reverse osmosis filter cartridge and the post-filter cartridge are directly connected through water holes in the chamber wall, after the replaceable filter cartridge assembly is removed from the chamber of the filter cartridge body, impurities and solid particles filtered by the filter cartridge will remain on the chamber wall. This requires cleaning before replacing with a new replaceable filter cartridge assembly, which is cumbersome and easily contaminates the filter cartridge.

[0049] This invention proposes a composite filter element for use in water purification equipment, which may be a water purifier, a water dispenser, or a pure water machine.

[0050] Please see Figures 1 to 3 In one embodiment of the present invention, the composite filter element 1 includes a filter bottle 20, a filter bottle cap 30, a separator cylinder 40, a reverse osmosis filtration assembly 50, and a replaceable filter element assembly 10; the filter bottle cap 30 covers the filter bottle 20 and has a reverse osmosis inlet 31, a wastewater outlet 32, and an installation port 33; the separator cylinder 40 is disposed inside the filter bottle 20 and forms a first filtration chamber 41 and a second filtration chamber 42 that are isolated from each other, the first filtration chamber 41 is located on the outer periphery of the second filtration chamber 42, and the second filtration chamber 42 is disposed corresponding to the installation port 33; the reverse osmosis filtration assembly 50 includes a reverse osmosis filter element 51 sleeved on the separator cylinder 40, the reverse osmosis filter element 51 is disposed inside the first filtration chamber 41, the raw water inlet side of the reverse osmosis filter element 51 is connected to the reverse osmosis inlet 31, and the reverse osmosis filter element 51... The wastewater outlet side of the filter element 51 is connected to the wastewater port 32; the replaceable filter element assembly 10 is detachably disposed in the second filter chamber 42 through the mounting port 33; the replaceable filter element assembly 10 includes a housing 100 and a filter element assembly 400, the filter element assembly 400 is disposed inside the housing 100, the housing 100 is provided with a rear water inlet 130 and a rear water outlet 140 respectively located at both ends of the length direction of the housing 100, the rear water inlet 130 and the rear water outlet 140 are both connected to the filter element assembly 400; wherein, the bottom of the separator cylinder 40 is also provided with a reverse osmosis outlet 43 connected to the second filter chamber 42, the reverse osmosis outlet 43 is connected to the pure water outlet side of the reverse osmosis filter element 51, and the reverse osmosis outlet 43 and the rear water inlet 130 are plugged in and connected.

[0051] Please see Figure 2Specifically, the filter bottle 20 has an installation cavity for installing the separator 40, the reverse osmosis filter assembly 50, and the replaceable filter element assembly 10. The cross-section of the filter bottle 20 is circular, which is adapted to the shape of the annular cylindrical reverse osmosis filter assembly 50. At least one end of the filter bottle 20 is open to allow the separator 40, the reverse osmosis filter assembly 50, and the replaceable filter element assembly 10 to be installed into the installation cavity. The filter bottle cover 30 covers the open end of the filter bottle 20 and is sealed to the filter bottle 20. The reverse osmosis inlet 31 and wastewater outlet 32 ​​on the filter bottle cover 30 are respectively connected to the corresponding inlet and outlet sides of the reverse osmosis filter element 51 of the reverse osmosis filter assembly 50. After the separator 40 is installed inside the filter bottle 20, it divides the internal space of the filter bottle 20 into a first filter chamber 41 and a second filter chamber 42 that are isolated from each other. The first filter chamber 41 is located in the second filter chamber 42. The first filter chamber 41 is approximately an annular cylindrical chamber, and the reverse osmosis filter assembly 50 is disposed in the first filter chamber 41, and the two are matched in shape. The second filter chamber 42 is approximately a cylindrical chamber, and the replaceable filter element assembly 10 is disposed in the second filter chamber 42. It can be removed from the second filter chamber 42 through the mounting port 33 on the filter bottle cover 30, which facilitates the replacement of the replaceable filter element assembly 10. The main function of the mounting port 33 is to avoid obstruction during the disassembly and assembly of the replaceable filter element assembly 10.

[0052] Please see Figure 5 The replaceable filter element assembly 10 includes a housing 100 and a filter element assembly 400, which is disposed within the housing 100. The housing 100 has a rear inlet 130 and a rear outlet 140 at its two ends along its length, respectively, both communicating with the filter element assembly 400. The rear inlet 130 allows water to flow in and be filtered by the filter element assembly 400, while the rear outlet 140 allows the filtered water to flow out. Furthermore, the bottom of the separator cylinder 40 is provided with a reverse osmosis outlet 43 communicating with the second filtration chamber 42. This means that the purified water produced after filtration by the reverse osmosis filter assembly 50 flows out through the reverse osmosis outlet 43. The reverse osmosis outlet 43 and the rear inlet 130 are connected by a plug-in connection, meaning that the purified water flowing out of the reverse osmosis outlet 43 flows into the housing 100 of the replaceable filter element assembly 10 through the rear inlet 130 for further filtration.

[0053] In summary, when the composite filter element 1 is working, the water flowing into the filter bottle 20 through the reverse osmosis inlet 31 is filtered by the reverse osmosis filter element 51 and then split into two streams: one stream of pure water and the other stream of wastewater. The wastewater is discharged from the wastewater outlet 32, while the pure water flows to the reverse osmosis outlet 43 and flows into the housing 100 of the replaceable filter element assembly 10 through the connected post-inlet 130. After being filtered by the filter element assembly 400, the pure water flows out through the post-outlet 140 for user use. In other words, during the water filtration process of the entire composite filter element 1, the water flow during the filtration of the reverse osmosis filter element 51 is only within the first filter chamber 41, and the water flow during the filtration of the filter element assembly 400 is only within the housing 100 of the replaceable filter element assembly 10. The water path between the two is only connected through the reverse osmosis outlet 43 and the post-inlet 130. The water flow will not flow in the second filter chamber 42. Therefore, when the replaceable filter element assembly 10 is removed from the second filter chamber 42, no impurities or solid particles generated by the composite filter element 1 during the operation will remain on the wall of the second filter chamber 42. Thus, it is not necessary to clean the wall of the second filter chamber 42 (i.e., the inner wall of the separator 40), and the reverse osmosis filter element 51 will not be contaminated.

[0054] The technical solution of the present invention sets the replaceable filter element assembly 10 as an independent detachable component, which has a housing 100 and a rear water inlet 130 and a rear water outlet 140 at both ends of the housing 100. The housing 100 is provided with a filter element assembly 400 for filtering the water flowing into the housing 100. When the replaceable filter element assembly 10 is installed in the second filter chamber 42 in the filter bottle 20, the reverse osmosis outlet 43 and the rear water inlet 130 are connected to realize water flow. The water will not flow in the second filter chamber 42. Therefore, when the replaceable filter element assembly 10 is removed from the second filter chamber 42, there will be no impurities, solid particles, etc. generated by the composite filter element 1 during the operation on the cavity wall of the second filter chamber 42. Therefore, there is no need to clean the cavity wall of the second filter chamber 42 (i.e., the inner wall surface of the separator 40) and the reverse osmosis filter element 51 will not be contaminated.

[0055] Please see Figures 3 to 5 In one embodiment, the bottom of the separator cylinder 40 is provided with a slot, which forms the reverse osmosis outlet 43. One end of the housing 100 is provided with a plug-in part, which forms the rear inlet 130. The plug-in part and the slot are plugged in to make the reverse osmosis outlet 43 and the rear inlet 130 connected.

[0056] Specifically, a slot is provided at the bottom of the separator cylinder 40, the slot being formed by an outward protrusion from the bottom of the separator cylinder 40, and the slot forming a reverse osmosis outlet 43. Correspondingly, a plug-in portion is provided on the housing 100 for insertion into the slot, the plug-in portion forming a rear inlet 130. When the two are plugged together, water circulation is achieved between the first filtration chamber 41 of the filter bottle 20 and the inner chamber of the housing 100 of the replaceable filter element assembly 10. Of course, in other embodiments, the bottom of the separator cylinder 40 may also have a plug-in portion, and the housing 100 may have a slot, with the two plugging together to achieve water circulation between the first filtration chamber 41 of the filter bottle 20 and the inner chamber of the housing 100 of the replaceable filter element assembly 10. No specific limitation is imposed on this.

[0057] Please see Figure 2 and Figure 3 In one embodiment, the separator cylinder 40 is provided with a water passage 44, which is connected to the first filter chamber 41. The slot is connected to the water passage 44. The water passage 44 extends radially along the separator cylinder 40 and penetrates the separator cylinder 40. The slot extends axially along the separator cylinder 40 and forms the reverse osmosis outlet 43.

[0058] Specifically, since the separator 40 divides the interior of the filter bottle 20 into a first filter chamber 41 and a second filter chamber 42, and the first filter chamber 41 is located on the outer periphery of the second filter chamber 42, while the replaceable filter element assembly 10 is detachably disposed within the second filter chamber 42, the separator 40 is also provided with a water passage 44, which connects the first filter chamber 41 and the reverse osmosis outlet 43 (formed in the slot). Furthermore, the water passage 44 extends radially along and through the separator 40, allowing purified water filtered by the reverse osmosis filter element 51 to flow into the water passage 44 from both sides of the separator 40, flow towards the reverse osmosis outlet 43, and finally into the housing 100 of the replaceable filter element assembly 10.

[0059] It should be noted that, in order to ensure the relative isolation of the water path within the first filter chamber 41 and the housing 100, the water flow channel 44 is configured to pass through the partition cylinder 40, rather than being formed on the wall of the partition cylinder 40. Specifically, the water flow channel 44 is located at the end of the partition cylinder 40 furthest from the wastewater outlet 32, and closer to the rear inlet 130 of the replaceable filter element assembly 10.

[0060] Please see Figure 2 and Figure 5In one embodiment, the filter element assembly 400 includes a post-filter element 420, which is disposed within the housing 100. The water inlet side of the post-filter element 420 is connected to the post-inlet 130, and the water outlet side of the post-filter element 420 is connected to the post-outlet 140.

[0061] Specifically, the filter assembly 400 can be configured as a post-filter 420. The post-filter 420 further purifies the water, removing residual impurities. Specifically, it removes any remaining minute impurities, odors, and discoloration that may remain in the water after treatment by the pre-filter 410 and the main filter (such as an RO reverse osmosis membrane). These impurities may include tiny suspended solids, organic compounds, etc. The post-filter 420, especially the activated carbon filter, effectively adsorbs odors and residual chlorine, resulting in a fresher, sweeter taste. This is particularly important for improving drinking water quality. In some cases, water treated by the RO reverse osmosis membrane may exhibit a certain alkalinity. Certain components in the post-filter 420 (such as certain minerals) can help regulate the water quality, making it closer to neutral or a suitable drinking pH. Some post-filters 420 are also designed to increase the mineral content of the water to meet the needs of specific groups for mineral water. Furthermore, the post-filter 420 further purifies the water, reducing harmful impurities and substances in the water that could damage downstream devices (such as water dispensers and electric kettles), thus extending their lifespan. The presence of the post-filter 420 also reduces the frequency of cleaning and maintenance of downstream devices, thereby minimizing costs associated with equipment malfunctions or maintenance.

[0062] Please see Figure 6 and Figure 7 In one embodiment, the replaceable filter assembly 10 further includes a separator 200 disposed within the housing 100. The separator 200 includes a partition plate 210 and a central tube 220. The partition plate 210 is connected to the outer wall of the central tube 220 and is sealed to the housing 100. The partition plate forms a first cavity 310 and a second cavity 320 isolated from the housing 100. The post-filter 420 is disposed in the second cavity 320 and fitted with the central tube 220. Specifically, the first cavity 310 is located on the side away from the reverse osmosis outlet 43, and the second cavity 320 is located on the side closer to the reverse osmosis outlet 43.

[0063] Furthermore, the filter element assembly 400 also includes a pre-filter element 410, which is disposed in the first cavity 310 and fitted with the central tube 220. The housing 100 is also provided with a pre-inlet 110 and a pre-outlet 120, which are both located on the side of the housing 100 away from the rear inlet 130. The pre-inlet 110 is connected to the inlet side of the pre-filter element 410, and the pre-outlet 120 is connected to the outlet side of the pre-filter element 410.

[0064] Specifically, the filter assembly 400 can include both a pre-filter 410 and a post-filter 420. The pre-filter 410 filters out large particles of impurities in the water, effectively removing sediment, rust, insect eggs, suspended solids, and other large particles, ensuring initial purification of the water entering the home. If these impurities directly enter household water pipes, faucets, washing machines, water heaters, and other appliances, they can easily cause blockages and wear. The pre-filter 410 effectively protects these appliances from damage. The initial filtration by the pre-filter 410 significantly reduces the filtration burden on subsequent water purification equipment (such as water purifiers and reverse osmosis systems), thereby extending their lifespan. Due to the presence of the pre-filter 410, the frequency of filter replacement in subsequent water purification equipment will also decrease, reducing costs associated with frequent filter changes. Furthermore, the pre-filter 410 also improves water quality; water filtered through the pre-filter 410 has a significantly reduced impurity content, resulting in a marked improvement in water quality. This not only makes daily water use, such as washing and laundry, more comfortable and healthier, but also provides a better foundation for subsequent water treatment processes. At the same time, the pre-filter 410 can reduce turbidity in the water, decreasing the possibility of bacterial growth and effectively reducing secondary pollution in pipes, water tanks, and other areas. Some pre-filters 410 also have scale-inhibiting functions; for example, using a scale-inhibiting filter containing hydrochloric acid polyphosphate can reduce scale formation inside solar water heaters, water dispensers, and other similar devices.

[0065] Please see Figure 7 , Figure 10 and Figure 11 It should be noted that the separator 200 includes two parts: a partition plate 210 and a central tube 220. The central tube 220 is configured as a hollow tube of a certain length, and a pure water flow channel 220a is formed inside it. Through the setting of the pure water flow channel 220a inside the central tube 220, the rear water inlet 130 and the rear water inlet 130 can be connected and isolated from the first cavity 310, so as not to affect the water flow of the pre-filter 410.

[0066] Furthermore, the partition plate 210 is plate-shaped and connected to the outer wall of the central tube 220. The connection between the central tube 220 and the partition plate 210 can be achieved through hot-melt welding, snap-fitting, or other methods. In this embodiment, the central tube 220 and the partition plate 210 are integrally formed. This integral forming avoids welding or connecting components in traditional manufacturing, thus eliminating seams and potential weaknesses. This helps improve the overall structural strength and durability, as seams are often the most vulnerable points to damage. Through integral forming, the material maintains continuity within the component, which helps to better transfer and disperse stress, thereby improving overall fatigue and fracture resistance. Moreover, integral forming can usually be completed in a single processing step, reducing the need for multiple processes (such as cutting, welding, and grinding) in traditional manufacturing. This not only saves time and improves production efficiency but also reduces production costs. Integral forming technology is often combined with automated production equipment, further improving production efficiency and consistency. Furthermore, through precise molds and processing equipment, unibody molding ensures the dimensional and shape accuracy of components, improving the overall appearance quality of the product. Unibody molding also offers significant advantages in cost reduction. On one hand, it reduces material waste caused by cutting and scrap, lowering raw material costs. On the other hand, by reducing processes and increasing automation, unibody molding also reduces reliance on manual labor and labor costs.

[0067] Please see Figures 7 to 9 The aforementioned partition 210 is sealed to the housing 100, meaning that the partition 210 is in sealed contact with the inner wall of the housing 100 to divide the chambers within the housing 100 into mutually isolated first cavities 310 and second cavities 320. The first and second cavities 310 are arranged along the length of the housing 100, which can define the length of the housing 100 as vertical, meaning the pre-filter 410 and post-filter 420 are arranged vertically. The volume of the pre-filter 410 is larger than that of the post-filter 420, and the length of the pre-filter 410 is greater than that of the post-filter 420 to ensure the filtration effect of both the pre-filter 410 and the post-filter 420. Since the pre-filter 410 is used to filter out most of the impurities in the raw water, its overall volume needs to be set relatively large. However, the water passing through the post-filter 420 has already been filtered twice, by the pre-filter 410 and the reverse osmosis filter 51, and the solute content in the water is already extremely low. Therefore, the overall volume of the post-filter 420 can be set relatively small. Thus, arranging the pre-filter 410 and the post-filter 420 in an up-down direction can ensure the filtration effect of the pre-filter 410 and the post-filter 420.

[0068] Please see Figure 10 and Figure 11In one embodiment, the central tube 220 includes a first tube portion 221 and a second tube portion 222 located on opposite sides of the partition plate 210. The pre-filter 410 is fitted with the first tube portion 221, and the post-filter 420 is fitted with the second tube portion 222. The wall thickness of the first tube portion 221 is not less than the wall thickness of the second tube portion 222. Specifically, the first tube portion 221 and the second tube portion 222 are located on opposite sides of the partition plate 210. Since it is necessary to ensure the isolation between the first cavity 310 and the second cavity 320, the pre-filter 410 is fitted with the first tube portion 221. The first tube portion 221 and the second tube portion 222 are coaxially arranged and their internal pure water flow channels 220a are connected. The end of the first tube portion 221 away from the partition plate 210 is directly sealed and connected to the post-outlet 140 to ensure that the pure water flow channel 220a connected to the outlet side of the post-filter 420 is isolated from the outlet side of the pre-filter 410. Similarly, the post-filter 420 is fitted with a second tube 222. The arrangement of the first tube 221 and the second tube 222 both provide a certain degree of support for the pre-filter 410 and the post-filter 420, preventing deformation of the pre-filter 410 and the post-filter 420 during use. Since the first tube 221 and the second tube 222 are subjected to the force of the pressure difference within the housing 100, the wall thickness of the first tube 221 is not less than the wall thickness of the second tube 222. Preferably, the wall thickness of the first tube 221 is set to be greater than the wall thickness of the second tube 222. On the one hand, this can provide better support for the longer pre-filter 410; on the other hand, the thicker first tube 221 can prevent the first tube 221 from being crushed or damaged due to pressure imbalance on its inner and outer sides.

[0069] In one embodiment, the wall thickness of the first tube portion 221 ranges from 1.5mm to 4mm, and / or the wall thickness of the second tube portion 222 ranges from 1.5mm to 3mm. Specifically, in this embodiment, the wall thickness of the first tube portion 221 may be greater than or equal to 1.5mm and less than or equal to 4mm, or the wall thickness of the second tube portion 222 may be greater than or equal to 1.5mm and less than or equal to 3mm. Alternatively, it may simultaneously satisfy the conditions that the wall thickness of the first tube portion 221 is greater than or equal to 1.5mm and less than or equal to 4mm, and the wall thickness of the second tube portion 222 is greater than or equal to 1.5mm and less than or equal to 3mm. It should be noted that the wall thickness of the first tube portion 221 should always be no less than the wall thickness of the second tube portion 222. The wall thickness of the first tube portion 221 is exemplarily 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, or 4mm, and the wall thickness of the second tube portion 222 is exemplarily 1.5mm, 2mm, 2.5mm, or 3mm. Considering the tolerances that exist in the actual manufacturing of the central tube 220, the specific values ​​of the wall thickness of the first tube portion 221 and the wall thickness of the second tube portion 222 are approximate, with a tolerance within ±0.2mm.

[0070] In one embodiment, the thickness of the partition 210 is greater than the thickness of the first tube 221, and / or the thickness of the partition 210 ranges from 3mm to 7mm. Specifically, since there is a large pressure difference between the first cavity 310 and the second cavity 320, the pressure in the two cavities will be concentrated on the partition 210. Therefore, the partition 210 needs to be made thicker. At the same time, making the partition 210 thicker also facilitates the opening of a sealing groove 213 and the provision of a sealing element 600 on the outer periphery of the partition 210 to achieve a seal with the housing 100. Regarding the thickness of the partition plate 210, firstly, the thickness of the partition plate 210 can be set to be greater than the thickness of the first tube portion 221; secondly, the thickness of the partition plate 210 can be limited to between 3mm and 7mm, that is, greater than or equal to 3mm and less than or equal to 7mm. The thickness of the partition plate 210 can be, for example, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, and 7mm. Considering the tolerances in the actual manufacturing of the central tube 220, the specific value of the aforementioned partition plate 210 is taken as an approximation, with a tolerance within ±0.2mm; thirdly, while ensuring that the thickness of the partition plate 210 is greater than that of the first tube portion 221, its thickness range can be limited to between 3mm and 7mm.

[0071] Please see Figure 7 and Figure 8In one embodiment, the partition plate 210 has a first mounting groove 211 on the side facing the first cavity 310. The replaceable filter element assembly 10 also includes an upper end cover 510 with an upper locking groove 511. The two ends of the pre-filter element 410 are respectively disposed in the first mounting groove 211 and the upper locking groove 511. Specifically, to fix the pre-filter element 410, the partition plate 210 has a first mounting groove 211 on the side facing the first cavity 310. One end of the pre-filter element 410 is placed in the first mounting groove 211, and the other end of the pre-filter element 410 is connected and fixed by the upper end cover 510 with the upper locking groove 511. In this way, by fixing the two ends of the pre-filter element 410, the pre-filter element 410 is installed and fixed as a whole, preventing it from moving or being damaged during use. The first mounting groove 211 is formed between the perimeter protruding from the partition plate 210 toward the first cavity 310 and the outer wall surface of the first tube.

[0072] Furthermore, the water inlet side of the pre-filter 410 is connected to the pre-inlet 110, and the water outlet side of the pre-filter 410 is connected to the pre-outlet 120. Moreover, both ends of the pre-filter 410 are glued to the first mounting groove 211 and the upper slot 511 respectively, to prevent the pre-filter 410 from being deformed or misaligned by water pressure impact, and to further extend the service life of the pre-filter 410.

[0073] Please see Figure 7 and Figure 9 In one embodiment, the partition plate 210 has a second mounting groove 212 on the side facing the second cavity 320. The replaceable filter element assembly 10 also includes a lower end cover 520, which has a lower retaining groove 521. The two ends of the rear filter element 420 are respectively disposed in the second mounting groove 212 and the lower retaining groove 521. Specifically, to fix the rear filter element 420, the partition plate 210 has a second mounting groove 212 on the side facing the second cavity 320. One end of the rear filter element 420 is placed in the second mounting groove 212, and the other end of the rear filter element 420 is connected and fixed by the lower end cover 520, which has a lower retaining groove 521. In this way, by fixing the two ends of the rear filter element 420, the entire rear filter element 420 is installed and fixed, preventing it from moving or being damaged during use. The second mounting groove 212 is formed between the perimeter protruding from the partition plate 210 toward the second cavity 320 and the outer wall surface of the second tube.

[0074] Furthermore, the water inlet side of the post-filter 420 is connected to the post-inlet 130, and the water outlet side of the post-filter 420 is connected to the pure water flow channel 220a. Moreover, both ends of the post-filter 420 are glued to the second mounting groove 212 and the lower retaining groove 521 respectively, to prevent the post-filter 420 from being deformed and misaligned due to water pressure impact, and to further extend the service life of the post-filter 420.

[0075] Please see Figures 9 to 11 In one embodiment, a water outlet 223 is provided at the end of the central tube 220 near the rear water inlet 130, and the water outlet side of the rear filter element 420 is connected to the pure water flow channel 220a through the water outlet 223. Specifically, the water outlet side of the rear filter element 420 is connected to the pure water flow channel 220a through the water outlet 223, which is a notch provided at the end of the central tube 220 to facilitate water flow. Multiple water outlets 223 can be provided, and the multiple water outlets 223 are arranged at intervals along the circumference of the central tube 220. Since the water outlet 223 is located at the end of the central pipe 220 near the rear water inlet 130, the pipe wall of the central pipe 220 guides the water flow in the second cavity 320 and supports the rear filter element 420. The pipe wall of the central pipe 220 guides the purified water filtered by the rear filter element 420 to the water outlet 223. The water flow path in the second cavity 320 is reasonable and can maintain relative balance with the water flow in the first cavity 310 in terms of the force on the partition plate 210.

[0076] Please see Figure 9 In one embodiment, the lower end cap 520 is provided with a protrusion 522, and the central tube 220 is fitted with the protrusion 522, with a gap between the protrusion 522 and the central tube 220. Specifically, the protrusion 522 is fitted at the end of the central tube 220, which can limit the end of the central tube 220 to prevent the central tube 220 from moving when subjected to the impact of water flow due to the lack of a limiting structure at the end of the central tube 220. At the same time, there is a gap between the protrusion 522 and the central tube 220, which is used to allow the purified water filtered by the post-filter cartridge 420 to flow through. The purified water flowing out from the outlet side of the post-filter cartridge 420 will flow sequentially through the water outlet 223, the gap between the protrusion 522 and the central tube 220 into the purified water flow channel 220a, and finally flow out from the post-outlet 140 for user use.

[0077] Please see Figure 9In one embodiment, the height of the protrusion 522 is higher than the height of the inlet 223 in the axial direction of the central tube 220. This arrangement further ensures the stability of the limiting relationship between the central tube 220 and the protrusion 522, preventing the central tube 220 from easily detaching from the protrusion 522. Simultaneously, it also prevents pure water passing through the inlet 223 from flowing directly into the pure water channel 220a, thus avoiding disruption of the force balance generated during water flow within the second cavity 320.

[0078] Please see Figures 9 to 11 In one embodiment, the partition plate 210 is provided with a sealing groove 213, and a sealing element 600 is provided within the sealing groove 213. The partition plate 210 and the housing 100 are sealed together by the sealing element 600. That is, to ensure the effectiveness and sealing performance of the sealing connection between the partition plate 210 and the housing 100, a sealing groove 213 is also provided on the surface of the partition plate 210 that mates with the inner wall of the housing 100. A sealing element 600 is provided within the sealing groove 213 so that the partition plate 210 and the housing 100 are sealed together by the sealing element 600. The sealing element 600 is a sealing ring; the type of sealing ring is not specifically limited, as long as it ensures a relative seal between the housing 100 and the partition plate 210.

[0079] This invention also proposes a water purification device, which includes the aforementioned composite filter element. The specific structure of the composite filter element is as described in the above embodiments. Since this water purification device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. The water purification device is a water purifier, a water dispenser, or a reverse osmosis water purifier.

[0080] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A composite filter element, characterized in that, include: Filter flask; A filter bottle cap is provided to cover the filter bottle, and the filter bottle cap is provided with a reverse osmosis inlet, a wastewater outlet and an installation port; A separator is disposed inside the filter bottle to form a first filter chamber and a second filter chamber that are isolated from each other. The first filter chamber is located on the outer periphery of the second filter chamber, and the second filter chamber is disposed corresponding to the mounting port. A reverse osmosis filtration assembly includes a reverse osmosis filter element sleeved in the partition cylinder, the reverse osmosis filter element being disposed in the first filtration chamber, the raw water inlet side of the reverse osmosis filter element being connected to the reverse osmosis inlet, and the wastewater outlet side of the reverse osmosis filter element being connected to the wastewater outlet. as well as A replaceable filter element assembly is detachably disposed in the second filter chamber through the mounting port; the replaceable filter element assembly includes a housing and a filter element assembly, the filter element assembly is disposed in the housing, the housing is provided with a rear water inlet and a rear water outlet located at both ends in the length direction of the housing, and both the rear water inlet and the rear water outlet are connected to the filter element assembly; The bottom of the separator cylinder is provided with a reverse osmosis outlet that communicates with the second filtration chamber. The reverse osmosis outlet is connected to the pure water outlet side of the reverse osmosis filter element, and the reverse osmosis outlet is also connected to the post-inlet. The pure water filtered by the reverse osmosis filter element flows into the housing of the replaceable filter element assembly through the post-inlet connected to the reverse osmosis outlet. The bottom of the separator cylinder is provided with a slot, which forms the reverse osmosis outlet. One end of the housing is provided with a plug-in part, which forms the post-inlet. The plug-in part and the slot are plugged in to connect the reverse osmosis outlet and the post-inlet.

2. The composite filter element as described in claim 1, characterized in that, The filter assembly includes a post-filter element disposed within the housing, with the water inlet side of the post-filter element connected to the post-inlet and the water outlet side of the post-filter element connected to the post-outlet.

3. The composite filter element as described in claim 2, characterized in that, The replaceable filter assembly further includes a separator disposed within the housing. The separator includes a middle partition and a central tube. The middle partition is connected to the outer wall of the central tube and is sealed to the housing. The separator and the housing form a first cavity and a second cavity that are isolated from each other. The post-filter is disposed in the second cavity and fitted with the central tube.

4. The composite filter element as described in claim 3, characterized in that, The filter assembly further includes a pre-filter, which is disposed in the first cavity and fitted with the central tube. The housing also has a pre-inlet and a pre-outlet, both of which are located on the side of the housing away from the rear inlet. The pre-inlet is connected to the inlet side of the pre-filter, and the pre-outlet is connected to the outlet side of the pre-filter.

5. The composite filter element as described in claim 4, characterized in that, The central tube forms a pure water flow channel, one end of which is connected to the rear water inlet through the second cavity, and the other end is connected to the rear water outlet.

6. The composite filter element as described in claim 5, characterized in that, The central tube includes a first tube section and a second tube section located on opposite sides of the partition plate. The pre-filter is fitted onto the first tube section, and the post-filter is fitted onto the second tube section. The wall thickness of the first tube section is not less than the wall thickness of the second tube section.

7. The composite filter element as described in claim 6, characterized in that, The wall thickness of the first tube portion ranges from 1.5 mm to 4 mm, and / or the wall thickness of the second tube portion ranges from 1.5 mm to 3 mm.

8. The composite filter element as described in claim 4, characterized in that, The partition plate has a first mounting groove on the side facing the first cavity. The replaceable filter element assembly also includes an upper cover with an upper slot. The two ends of the pre-filter element are respectively located in the first mounting groove and the upper slot.

9. The composite filter element as described in claim 8, characterized in that, The inlet side of the pre-filter element is connected to the pre-inlet, the outlet side of the pre-filter element is connected to the pre-outlet, and both ends of the pre-filter element are respectively glued to the first mounting groove and the upper slot.

10. The composite filter element as described in claim 3, characterized in that, The partition plate has a second mounting groove on the side facing the second cavity. The replaceable filter element assembly also includes a lower end cover with a lower locking groove. The two ends of the rear filter element are respectively disposed in the second mounting groove and the lower locking groove.

11. The composite filter element as described in claim 10, characterized in that, The water inlet side of the post-filter element is connected to the post-inlet, the water outlet side of the post-filter element is connected to the pure water flow channel, and both ends of the post-filter element are respectively glued to the second mounting groove and the lower slot.

12. The composite filter element as described in claim 10, characterized in that, A water outlet is provided at the end of the central tube near the rear water inlet, and the water outlet side of the rear filter element is connected to the pure water channel through the water outlet.

13. The composite filter element as described in claim 12, characterized in that, The lower end cap is provided with a protrusion, the central tube is fitted with the protrusion, and there is a gap between the protrusion and the central tube.

14. The composite filter element as described in claim 13, characterized in that, In the axial direction of the central tube, the height of the protrusion is higher than the height of the water inlet.

15. The composite filter element as described in claim 1, characterized in that, The separator cylinder is provided with a water passage, which is connected to the first filter chamber. The slot is connected to the water passage. The water passage extends radially along the separator cylinder and penetrates the separator cylinder. The slot extends axially along the separator cylinder and forms the reverse osmosis outlet.

16. The composite filter element as described in claim 15, characterized in that, The water flow channel is located at the end of the separator cylinder furthest from the wastewater outlet.

17. A water purification device, characterized in that, Includes the composite filter element as described in any one of claims 1 to 16.

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