A front and rear post and RO membrane separable replacement integrated composite filter core

Abstract

This utility model discloses an integrated composite filter cartridge with separate replaceable pre- and post-filters and an RO membrane, comprising: a filter bottle with a raw water inlet, a pure water outlet, and a concentrated water outlet on its top wall and an installation port on its bottom wall; an RO filter module installed inside the filter bottle, including an inner cylinder, an RO membrane, an upper end cap, and a lower end cap; and a pre- and post-filter module detachably installed inside the inner cylinder via the installation port of the filter bottle, comprising a main housing, a pre-filter assembly, and a post-filter assembly. The main housing has a partition that divides its cavity into a post-filter chamber and a pre-filter chamber, with a central tube in the partition. The pre-filter assembly is located in the pre-filter chamber. The post-filter assembly has an annular structure and is installed in the post-filter chamber corresponding to the outer side of the second through-hole. A plug for sealing the installation port is also provided at the lower end of the main housing. The pre- and post-filter modules of this utility model can be easily disassembled and replaced separately from the filter bottle, greatly reducing maintenance and operating costs.

Description

Technical Field

[0001] This utility model relates to the field of water treatment equipment technology, and in particular to an integrated composite filter element in which the pre- and post-filters and the RO membrane can be replaced separately. Background Technology

[0002] As we all know, reverse osmosis water purifiers are common water purification devices in people's daily lives. They mainly consist of a pre-filter, a post-filter, and an RO membrane filter. The pre-filter, RO membrane filter, and post-filter are usually installed at the beginning, middle, and end of the water circuit of the reverse osmosis water purifier, respectively. The water entering the water purifier first undergoes primary filtration through the pre-filter, then undergoes fine filtration through the RO membrane filter, then undergoes post-filter to improve the taste, and finally flows to the terminal for user use.

[0003] In existing technologies, to accommodate the miniaturized design of water purification equipment, pre-filters, post-filters, and RO membrane filters are often combined into an integrated filter cartridge. However, because RO membrane filters have a long lifespan while pre- and post-filters have short lifespans, the entire filter cartridge needs to be replaced when the pre- and post-filters reach the end of their lifespan. This results in waste of the RO membrane, increasing filter replacement costs and user operating costs, indicating room for improvement. Utility Model Content

[0004] The present invention aims to overcome the defects in the prior art by providing an integrated composite filter element in which the pre- and post-filters and the RO membrane can be replaced separately. Its structure is simple and reasonable, and the pre- and post-filter modules can be easily disassembled and replaced from the filter bottle, thus greatly reducing maintenance costs. At the same time, the RO filter module, the pre- and post-filter modules and the filter bottle are tightly and reliably matched, effectively ensuring the sealing of each water passage inside the filter element.

[0005] To achieve the above objectives, this utility model provides an integrated composite filter element with replaceable pre- and post-filters and RO membranes, comprising: A filter bottle has a raw water inlet, a pure water outlet, and a concentrated water outlet arranged sequentially from the center outwards on its top wall, and an installation port is provided in the center of its bottom wall. A first separating ring is provided between the raw water inlet and the pure water outlet on the lower surface of the top wall of the filter bottle, a second separating ring and a third separating ring are provided between the pure water inlet and the concentrated water inlet, and a fourth separating ring is provided on the outer periphery of the concentrated water outlet. The first, second, third, and fourth separating rings are arranged in a concentric circle structure. An RO filtration module, installed inside a filter bottle, includes an inner cylinder, an RO membrane disposed outside the inner cylinder, and an upper end cap and a lower end cap respectively fitted onto the upper and lower ends of the RO membrane. The upper end cap is provided with a first through hole for the inner cylinder to pass through, and a first flange extending upward is provided on the outer periphery of the first through hole. The first flange is sealed and connected to the inner wall of the fourth partition ring, and the upper port of the inner cylinder is sealed and connected to the inner wall of the third partition ring, so that the first flange and the inner cylinder cooperate to form a concentrated water outlet channel connected to the concentrated water outlet. The pre- and post-filter modules are detachably installed in the inner cylinder through the installation port of the filter bottle. The modules include a main housing, a pre-filter assembly, and a post-filter assembly. The main housing has a relatively closed cavity inside, which is provided with a partition that divides the cavity into a post-cavity and a pre-cavity. The partition is provided with a central tube that communicates with the pre-cavity and extends upward through the top wall of the post-cavity at the position opposite to the raw water inlet. The central tube is sealed and connected to the inner wall of the first partition ring to form a raw water inlet channel that communicates with the raw water inlet. The pre-filter assembly is located in the pre-cavity, and the bottom of the pre-cavity is provided with a pre-filter outlet channel for the initial filtered water to flow out and communicates with the inner cavity of the filter bottle. The top wall of the post-filter chamber is provided with a second through hole for the central tube to pass through. The post-filter assembly is a ring structure and is installed in the post-filter chamber outside the second through hole. The post-filter assembly divides the post-filter chamber into a fine water chamber on the outside and a pure water chamber on the inside. The upper surface of the top wall of the rear cavity is provided with an upwardly extending second flange corresponding to the outer periphery of the second through hole. The second flange is sealed and connected to the inner wall of the second partition ring so that the gap between the second through hole and the central tube, and the gap between the second flange and the first partition ring are connected to form a pure water outlet channel. The pure water outlet channel connects the pure water cavity and the pure water outlet. At least one fine filtration water channel is provided between the inner cylinder wall and the rear cavity wall for the fine filtration water generated by RO membrane filtration to flow into the fine filtration water cavity. The lower end of the main housing is also provided with a plug for sealing the installation port.

[0006] The pre-filter assembly is further configured as follows: it is a ring structure for water filtration from the outside to the inside or a structure with at least one layer for water filtration from top to bottom.

[0007] The main housing is further configured as follows: the main housing includes a connecting seat, an upper barrel connected to the upper part of the connecting seat to form a rear cavity, and a lower barrel connected to the lower part of the connecting seat to form a front cavity; the central tube is configured on the connecting seat; and the plug is integrally connected to the bottom of the lower barrel.

[0008] Further configured as follows: the lower port of the upper barrel is provided with a number of upper slots at intervals around the periphery, and the upper part of the connecting seat is provided with a number of upper buckles that correspond one-to-one with the upper slots for fastening. And / or, the upper port of the lower barrel is provided with a number of lower latches at intervals around the periphery, and the lower part of the connecting seat is provided with a number of lower buckles that correspond one-to-one with the lower latches.

[0009] The upper barrel and the inner barrel are arranged with a gap to form a transition cavity. The inner barrel is provided with a plurality of first connecting holes communicating with the transition cavity, and the upper barrel is provided with a plurality of second connecting holes communicating with the transition cavity.

[0010] The inner wall of the inner cylinder is further configured with a constricted section at the upper part of the connecting seat, and the constricted section is sealed and connected to the upper part of the connecting seat.

[0011] The further configuration includes: a through-hole is provided on the bottom wall of the pre-cavity, and the plug is provided with a transverse water passage and a communication port between the water passage and the inner cavity of the filter bottle in the corresponding part of the structure located inside the filter bottle.

[0012] A further configuration includes: a first sealing ring provided between the first separating ring and the central tube; And / or, a second sealing ring is provided between the second partition ring and the second flange; And / or, a third sealing ring is provided between the third partition ring and the inner cylinder; And / or, a fourth sealing ring is provided between the fourth separating ring and the first flange.

[0013] The plug is further configured such that the mounting port of the filter bottle is connected by an interference fit, a rotary snap-fit, or a threaded fit.

[0014] Compared with the prior art, the present invention has a simple and reasonable structure. The pre- and post-filter modules can be easily disassembled and replaced from the filter bottle, which greatly reduces maintenance costs. At the same time, the RO filter module, the pre- and post-filter modules and the filter bottle are tightly and reliably matched, which effectively ensures the sealing of each water passage inside the filter element. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the separation structure of the integrated composite filter element of this utility model; Figure 2 This is a schematic diagram of the structure after the pre- and post-filter modules are separated from the installation port of the filter bottle; Figure 3 This is a schematic diagram of the axial cross-sectional structure of an integrated composite filter element; Figure 4 yes Figure 3A magnified structural diagram of part A; Figure 5 This is a schematic diagram of the separate structure of the pre- and post-filter modules.

[0016] The following reference numerals are marked on the accompanying drawings: 10. Filter bottle; 11. Raw water inlet; 12. Pure water outlet; 13. Concentrated water outlet; 14. Installation port; 15. First partition ring; 16. Second partition ring; 17. Third partition ring; 18. Fourth partition ring; 20. RO filter module; 21. Inner cylinder; 211. Narrow section; 212. First connecting hole; 22. RO membrane; 23. Top cover; 231. First flange; 24. Bottom cover; 30. Front and rear filter modules; 31. Main shell; 311. Connecting seat; 3111. Central tube; 3112. Upper buckle; 3113. Lower buckle; 312. Upper tank; 3121. Second flange; 3122. Second connecting hole; 3123. Upper latch; 313. Lower tank; 3131. Lower latch; 3132. Water passage hole; 32. Pre-filter assembly; 321. Water-blocking end cap; 33. Post-filter assembly; 34. Plug; 341. Through port; H1, filter bottle inner cavity; H2, pre-filter cavity; H3, post-filter cavity; H4, fine filtration cavity; H5, pure water cavity; H6, transition cavity. Detailed Implementation

[0017] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0018] This utility model discloses an integrated composite filter element with separate replacement of the pre- and post-filters and the RO membrane. Figure 1 , Figure 2 and Figure 3 As shown, the system includes a filter bottle 10, an RO filter module 20, and pre- and post-filter modules 30 installed inside the filter bottle 10. The top wall of the filter bottle 10 has a raw water inlet 11, a pure water outlet 12, and a concentrated water outlet 13 arranged sequentially from the center outwards, and the bottom wall has an installation port 14 in the center. The RO filter module 20 has a ring structure and is installed on the outer periphery of the installation port 14. The pre- and post-filter modules 30 are detachably installed in the inner hole of the RO filter module 20 through the installation port 14. In this way, the pre- and post-filter modules 30 and the RO filter module 20 can be disassembled and replaced separately, which greatly reduces maintenance and operating costs.

[0019] In this embodiment, as Figure 3 and Figure 4As shown, a first separating ring 15 is provided on the lower surface of the top wall of the filter bottle 10 between the raw water inlet 11 and the pure water outlet 12, a second separating ring 16 and a third separating ring 17 are provided between the pure water inlet and the concentrated water inlet, and a fourth separating ring 18 is provided on the outer periphery of the concentrated water outlet 13. The first, second, third and fourth separating rings 18 are arranged in a concentric circle structure.

[0020] In this embodiment, as Figure 3 and Figure 4 The RO filter module 20 includes an inner cylinder 21, an RO membrane 22 disposed outside the inner cylinder 21, and an upper end cap 23 and a lower end cap 24 respectively fitted onto the upper and lower ends of the RO membrane 22. The upper end cap 23 is provided with a first through hole for the inner cylinder 21 to pass through, and a first flange 231 extending upward is provided on the outer periphery of the first through hole. The first flange 231 is sealed and connected to the inner wall of the fourth partition ring 18, and the upper port of the inner cylinder 21 is sealed and connected to the inner wall of the third partition ring 17, so that the first flange 231 and the inner cylinder 21 cooperate to form a concentrated water outlet channel connected to the concentrated water outlet 13. Thus, the concentrated water produced by the RO filter module 20 flows out through the gap between the first through hole and the inner cylinder 21 and is discharged through the concentrated water outlet channel.

[0021] In this embodiment, as Figure 3 , Figure 4 and Figure 5As shown, the pre- and post-filter modules 30 include a main housing 31, a pre-filter assembly 32, a post-filter assembly 33, and a plug 34. The plug 34 is used to seal the installation port 14 so that a closed filter bottle cavity H1 is formed inside the filter bottle 10. The main housing 31 has a relatively closed cavity inside, and a partition is provided inside to divide the cavity into a post-filter cavity H3 and a pre-filter cavity H2. A central tube 3111 is constructed at the position opposite to the raw water inlet 11, which is connected to the pre-filter cavity H2 and extends upward through the top wall of the post-filter cavity H3. The central tube 3111 is sealed and connected to the inner wall of the first partition ring 15 to form a raw water inlet channel connected to the raw water inlet 11. The pre-filter assembly 32 is disposed in the pre-filter cavity H2, and the bottom of the pre-filter cavity H2 is constructed to provide a pre-filtered water outlet channel for the pre-filtered water to flow out and connect to the filter bottle cavity H1. The top wall of H3 is provided with a second through hole for the central tube 3111 to pass through. The post-filter assembly 33 is a ring structure and is installed in the post cavity H3 outside the second through hole. The post-filter assembly 33 divides the post cavity H3 into a fine water chamber located on the outside and a pure water chamber H5 located on the inside. The upper surface of the top wall of the post cavity H3 is provided with an upwardly extending second flange 3121 corresponding to the outer periphery of the second through hole. The second flange 3121 is sealed and connected to the inner wall of the second partition ring 16 so that the gap between the second through hole and the central tube 3111 and the gap between the second flange 3121 and the first partition ring 15 are connected to form a pure water outlet channel. The pure water outlet channel connects the pure water chamber H5 and the pure water outlet 12. At least one fine water outlet channel is constructed between the inner wall of the inner cylinder 21 and the cavity wall of the post cavity H3 for the fine water produced by the RO membrane 22 to flow into the fine water chamber.

[0022] The water flow path inside the integrated composite filter element is as follows: raw water inlet 11 (raw water) → raw water inlet channel → pre-filter chamber H2 → pre-filter assembly 32 (pre-filtered water) → pre-filtered water outlet channel → filter bottle inner chamber H1 → RO membrane 22 (fine filtered water) → fine filtered water channel → fine filtered water chamber H4 → post-filter assembly 33 (pure water) → pure water chamber H5 → pure water outlet channel → pure water outlet 12; RO membrane 22 (concentrated water) → concentrated water outlet channel → concentrated water outlet 13.

[0023] In this embodiment, the pre-filter assembly 32 is an annular structure for water filtration from the outside to the inside. The lower annular opening of the pre-filter assembly 32 rests on the bottom wall of the pre-filter chamber H2, and its upper annular opening is fitted with a water-blocking end cap 321. The raw water flowing in from the raw water inlet channel flows into the interior of the pre-filter assembly 32 under the action of the water-blocking end cap 321. The inlet of the primary filtered water outlet channel is correspondingly located on the bottom wall of the pre-filter chamber H2 opposite to the inner annular hole of the pre-filter assembly 32. In other specific embodiments, the pre-filter assembly 32 may also be a structure with at least one layer for water filtration from top to bottom, and the inlet of the primary filtered water outlet channel is located on the bottom wall of the pre-filter chamber H2.

[0024] In this embodiment, as Figure 5 As shown, the main housing 31 of the pre- and post-filter modules 30 includes a connecting seat 311, an upper barrel 312 connected to the upper part of the connecting seat 311 to form the post-filter cavity H3, and a lower barrel 313 connected to the lower part of the connecting seat 311 to form the pre-filter cavity H2. Specifically, the lower port of the upper barrel 312 has a plurality of upper latches 3123 spaced around its periphery, the upper part of the connecting seat 311 has a plurality of upper latches 3112 that correspond to and engage with the upper latches 3123, the upper port of the lower barrel 313 has a plurality of lower latches 3131 spaced around its periphery, and the lower part of the connecting seat 311 has a plurality of lower latches 3113 that correspond to and engage with the lower latches 3131. The barrel 312 and the connecting seat 311, as well as the lower barrel 313 and the connecting seat 311, are connected by fastening. The central tube 3111 is constructed on the connecting seat 311, and the plug 34 is integrally connected to the bottom of the lower barrel 313. At the same time, a water passage hole 3132 is correspondingly opened on the bottom wall of the lower barrel 313. The part of the plug 34 located inside the filter bottle 10 is constructed with a transverse guide hole 3132 and a guide port 341 for connecting the water passage hole 3132 and the inner cavity H1 of the filter bottle. Thus, the water passage hole 3132 and the guide port 341 cooperate to form a primary water filtration channel. In some other specific embodiments, the guide port 341 can also be formed by connecting ribs arranged at intervals between the plug 34 and the lower barrel 313.

[0025] In this embodiment, as Figure 3 As shown, the upper barrel 312 and the inner barrel 21 are arranged with a gap to form a transition cavity H6. The inner barrel 21 is provided with a number of first connecting holes 212 communicating with the transition cavity H6, and the upper barrel 312 is provided with a number of second connecting holes 3122 communicating with the transition cavity H6. Thus, the first connecting holes 212, the transition cavity H6 and the second connecting holes 3122 cooperate to form a fine filtration water channel. Preferably, the inner wall of the inner barrel 21 is provided with a constriction section 211 at the upper part of the connecting seat 311. The constriction section 211 is sealed and connected to the upper part of the connecting seat 311, thus forming a relatively closed cavity between the upper barrel 312 and the inner barrel 21. Preferably, the first connecting holes 212 and the second connecting holes 3122 are staggered, which facilitates the uniform flow of fine filtration water into the fine filtration cavity H4.

[0026] In this embodiment, to ensure the sealing effect of each channel, a first sealing ring is provided between the first partition ring 15 and the central tube 3111, a second sealing ring is provided between the second partition ring 16 and the second flange 3121, a third sealing ring is provided between the third partition ring 17 and the inner cylinder 21, and a fourth sealing ring is provided between the fourth partition ring 18 and the first flange 231.

[0027] In this embodiment, the plug 34 is connected to the mounting port 14 of the filter bottle 10 by an interference fit; in some other specific embodiments, the plug 34 is also connected to the mounting port 14 of the filter bottle 10 by a rotation snap or a threaded fit.

[0028] Compared with the prior art, the present invention has a simple and reasonable structure. The pre- and post-filter modules can be easily disassembled and replaced from the filter bottle, which greatly reduces maintenance costs. At the same time, the RO filter module, the pre- and post-filter modules and the filter bottle are tightly and reliably matched, which effectively ensures the sealing of each water passage inside the filter element.

[0029] The above-disclosed embodiments are merely examples of the present utility model. However, the present utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. An integrated composite filter element with replaceable pre- and post-filters and RO membranes, characterized in that, include: A filter bottle has a raw water inlet, a pure water outlet, and a concentrated water outlet arranged sequentially from the center outwards on its top wall, and an installation port is provided in the center of its bottom wall. A first separating ring is provided between the raw water inlet and the pure water outlet on the lower surface of the top wall of the filter bottle, a second separating ring and a third separating ring are provided between the pure water inlet and the concentrated water inlet, and a fourth separating ring is provided on the outer periphery of the concentrated water outlet. The first, second, third, and fourth separating rings are arranged in a concentric circle structure. An RO filtration module, installed inside a filter bottle, includes an inner cylinder, an RO membrane disposed outside the inner cylinder, and an upper end cap and a lower end cap respectively fitted onto the upper and lower ends of the RO membrane. The upper end cap is provided with a first through hole for the inner cylinder to pass through, and a first flange extending upward is provided on the outer periphery of the first through hole. The first flange is sealed and connected to the inner wall of the fourth partition ring, and the upper port of the inner cylinder is sealed and connected to the inner wall of the third partition ring, so that the first flange and the inner cylinder cooperate to form a concentrated water outlet channel connected to the concentrated water outlet. The pre- and post-filter modules are detachably installed in the inner cylinder through the installation port of the filter bottle. The modules include a main housing, a pre-filter assembly, and a post-filter assembly. The main housing has a relatively closed cavity inside, which is provided with a partition that divides the cavity into a post-cavity and a pre-cavity. The partition is provided with a central tube that communicates with the pre-cavity and extends upward through the top wall of the post-cavity at the position opposite to the raw water inlet. The central tube is sealed and connected to the inner wall of the first partition ring to form a raw water inlet channel that communicates with the raw water inlet. The pre-filter assembly is located in the pre-cavity, and the bottom of the pre-cavity is provided with a pre-filter outlet channel for the initial filtered water to flow out and communicates with the inner cavity of the filter bottle. The top wall of the post-filter chamber is provided with a second through hole for the central tube to pass through. The post-filter assembly is a ring structure and is installed in the post-filter chamber outside the second through hole. The post-filter assembly divides the post-filter chamber into a fine water chamber on the outside and a pure water chamber on the inside. The upper surface of the top wall of the rear cavity is provided with an upwardly extending second flange corresponding to the outer periphery of the second through hole. The second flange is sealed and connected to the inner wall of the second partition ring so that the gap between the second through hole and the central tube, and the gap between the second flange and the first partition ring are connected to form a pure water outlet channel. The pure water outlet channel connects the pure water cavity and the pure water outlet. At least one fine filtration water channel is provided between the inner cylinder wall and the rear cavity wall for the fine filtration water generated by RO membrane filtration to flow into the fine filtration water cavity. The lower end of the main housing is also provided with a plug for sealing the installation port.

2. The integrated composite filter element with separate replaceable pre- and post-filters and RO membranes as described in claim 1, characterized in that, The pre-filter assembly is a ring structure that filters water from the outside in or a structure with at least one layer that filters water from top to bottom.

3. The integrated composite filter element with separate replacement of pre- and post-filters and RO membranes according to claim 1, characterized in that, The main housing includes a connecting seat, an upper barrel connected to the upper part of the connecting seat to form a rear cavity, and a lower barrel connected to the lower part of the connecting seat to form a front cavity. The central tube is disposed on the connecting seat, and the plug is integrally connected to the bottom of the lower barrel.

4. The integrated composite filter element with separate replacement of pre- and post-filters and RO membranes according to claim 3, characterized in that, The lower port of the upper barrel is provided with several upper slots at intervals around the periphery, and the upper part of the connecting seat is provided with several upper buckles that correspond one-to-one with the upper slots. And / or, the upper port of the lower barrel is provided with a number of lower latches at intervals around the periphery, and the lower part of the connecting seat is provided with a number of lower buckles that correspond one-to-one with the lower latches.

5. The integrated composite filter element with separate replacement of pre- and post-filters and RO membranes according to claim 3, characterized in that, The upper barrel wall and the inner barrel wall are arranged with a gap to form a transition cavity. The inner barrel is provided with a number of first connecting holes communicating with the transition cavity, and the upper barrel is provided with a number of second connecting holes communicating with the transition cavity.

6. The integrated composite filter element with separate replaceable pre- and post-filters and RO membranes according to claim 5, characterized in that, The inner wall of the inner cylinder is provided with a constricted section at the upper part of the connecting seat, and the constricted section is sealed and connected to the upper part of the connecting seat.

7. The integrated composite filter element with separate replacement of pre- and post-filters and RO membranes according to claim 3, characterized in that, The bottom wall of the pre-filter chamber is provided with a through water passage hole, and the plug is provided with a transverse water passage hole and a communication port between the plug and the inner cavity of the filter bottle.

8. The integrated composite filter element with separate replacement of pre- and post-filters and RO membranes according to claim 1, characterized in that, A first sealing ring is provided between the first separating ring and the central tube; And / or, a second sealing ring is provided between the second partition ring and the second flange; And / or, a third sealing ring is provided between the third partition ring and the inner cylinder; And / or, a fourth sealing ring is provided between the fourth separating ring and the first flange.

9. The integrated composite filter element with separate replaceable pre- and post-filters and RO membranes according to claim 1, characterized in that, The plug and the filter bottle are connected by an interference fit, a rotary snap-fit, or a threaded fit.

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