Filter element with double-layer central pipe

Abstract

The utility model discloses a filter element with a double-layer central pipe, which comprises a shell, and a water inlet joint assembly, a pure water switching assembly, a first central pipe, a second central pipe and an RO (reverse osmosis) membrane assembly are arranged in the shell; one end and the other end of the first central pipe are respectively connected with the water inlet connector assembly and the pure water switching assembly; the first central pipe is arranged on the outer side of the second central pipe in a surrounding mode, the RO membrane assembly is arranged on the outer side of the first central pipe in a surrounding mode, and a plurality of water permeable holes are formed in the two sides of the first central pipe respectively; a water inlet, a pure water port and a concentrated water port are formed in one end of the shell, one end of the second central pipe is connected with the water inlet through the water inlet connector assembly, and the other end of the second central pipe is communicated with an inner cavity of the pure water switching assembly; according to the filter element disclosed by the invention, the pure water transfer assembly is matched with the RO membrane assembly and the water permeable hole of the first central pipe, so that the pure water is conveyed, the volume of the pure water in the shell is greatly increased, and the TDS value of a first cup of water is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering devices, in particular to a filter element with a double-layer central tube. Background Art

[0002] At present, reverse osmosis water purifiers are widely popularized and applied in daily household life. Based on the principle of ion diffusion, reverse osmosis water purifiers can effectively remove impurities and harmful substances in water and provide safe and healthy drinking water for families. However, during the use of existing reverse osmosis water purifiers, there is a phenomenon of forward osmosis, which is particularly obvious during the standing process of reverse osmosis water purifiers.

[0003] Most of the reverse osmosis filter elements currently on the market are designed with relatively large volumes at the water inlet end and the concentrated water end, while the volume of the pure water end is relatively small. Although this structural design improves the water purification efficiency to a certain extent, it also brings certain drawbacks. Specifically, due to the relatively large volumes of the water inlet end and the concentrated water end, high-salt water bodies are likely to accumulate inside the reverse osmosis water inlet device. During the standing process, affected by the forward osmosis phenomenon, these high-concentration salts will gradually penetrate through the reverse osmosis membrane and into the pure water end. Since the volume of the pure water end is small, it cannot effectively dilute these penetrated salts, resulting in a gradual increase in the concentration of the pure water end, and thus the total dissolved solids (TDS) content of the first glass of water is too high, reducing the user experience.

[0004] It can be seen that the existing technology still needs to be improved. Content of the Utility Model

[0005] In view of the above deficiencies of the existing technology, the purpose of the present utility model is to provide a filter element with a double-layer central tube, which can increase the volume of pure water in the shell, effectively reduce the TDS value of the first glass of water, and improve the user experience.

[0006] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0007] A filter element with a double-layer central tube includes a shell, and an inlet joint assembly, a pure water transfer assembly, a first central tube, a second central tube, and an RO membrane assembly are arranged inside the shell; one end and the other end of the first central tube are respectively connected to the inlet joint assembly and the pure water transfer assembly; the first central tube surrounds the outside of the second central tube, the RO membrane assembly surrounds the outside of the first central tube, and a plurality of water permeable holes are respectively formed on both sides of the first central tube; one end of the shell is provided with a water inlet, a pure water outlet, and a concentrated water outlet, one end of the second central tube is connected to the water inlet through the inlet joint assembly, and the other end of the second central tube communicates with the inner cavity of the pure water transfer assembly.

[0008] In the described filter element with a double-layer central tube, the pure water transfer assembly includes a pure water adapter. A pure water flow channel is provided at the bottom of the pure water adapter, and a water inlet flow channel is provided in the middle of the pure water adapter. The other end of the second central tube is connected to the water inlet end of the water inlet flow channel. An outlet is provided at the water outlet end of the water inlet flow channel, and the outlet is used to deliver the inlet water to the RO membrane assembly. The input end of the pure water flow channel is communicated with the inner cavity of the first central tube, and the output end of the pure water flow channel is used to deliver the pure water to the pure water port.

[0009] In the described filter element with a double-layer central tube, the pure water transfer assembly further includes a first collar, a first seal and a second seal. One end of the first collar is looped around the other end of the second central tube, and the other end of the first collar is located in the water inlet flow channel. The first seal is arranged at the connection between the first collar and the water inlet flow channel. The second seal is arranged at the connection between the pure water adapter and the first central tube.

[0010] In the described filter element with a double-layer central tube, the pure water transfer assembly further includes a pure water end cap and a third seal. The other end of the pure water adapter is connected to the inner cavity of the other end of the pure water end cap. The third seal is arranged at the connection between the pure water adapter and the pure water end cap. The pure water end cap is detachably connected to the inner wall of the housing. A drainage flow channel is formed between the outer side of the pure water end cap and the inner wall of the housing. A drainage port is opened at the other end of the water outlet end cap. The pure water flow channel is connected to the pure water port through the drainage port and the drainage flow channel.

[0011] In the described filter element with a double-layer central tube, a cavity is further arranged in the housing and surrounds the outside of the RO membrane assembly. The pure water transfer assembly further includes a fourth seal. One end of the pure water end cap surrounds the outside of the cavity, and the fourth seal is located between the inner wall of the pure water end cap and the outer wall of the cavity.

[0012] In the described filter element with a double-layer central tube, the water inlet joint assembly includes a water inlet adapter and a fifth seal. A limit seat is arranged in the housing. One end of the water inlet adapter is located in the limit seat. The fifth seal is arranged between the water inlet adapter and the inner wall of the limit seat. One end of the second central tube is communicated with the water inlet through the inner cavity of the water inlet adapter.

[0013] In the filter element with a double-layer central tube, the water inlet joint assembly further includes a second collar, a sixth seal, and a seventh seal; the other end of the second collar is sleeved on one end of the second central tube, one end of the second collar is located inside the cavity of the water inlet adapter, and the sixth seal is arranged at the connection between the second collar and the water inlet adapter; the seventh seal is arranged at the connection between the water inlet adapter and the first central tube.

[0014] In the filter element with a double-layer central tube, the water inlet joint assembly further includes a concentrated water end cap, an eighth seal, and a ninth seal. A fixed seat is arranged inside the housing. One end of the concentrated water end cap is arranged inside the fixed seat, and the eighth seal is located between the outer wall of the concentrated water end cap and the inner wall of the fixed seat; a concentrated water flow channel is formed between the inner cavity of the concentrated water end cap and the inner wall of the fixed seat. The water inlet end of the concentrated water flow channel is communicated with the RO membrane assembly, and the water outlet end of the concentrated water flow channel is communicated with the concentrated water port; the other end of the concentrated water end cap surrounds the outside of the cavity, and the ninth seal is located between the inner wall of the concentrated water end cap and the outer wall of the cavity.

[0015] In the filter element with a double-layer central tube, a connection seat is arranged at one end of the housing, and the water inlet, the concentrated water port, and the pure water port are opened at the end of the connection seat; connection blocks are arranged on the side of the connection seat.

[0016] In the filter element with a double-layer central tube, an operation block is arranged at the other end of the housing, and an operation groove is opened on the side of the operation block.

[0017] Beneficial effects:

[0018] The utility model provides a filter element with a double-layer central tube. Water inlet is realized through the second central tube, reducing the volume of water inlet inside the housing; then, through the pure water transfer assembly cooperating with the RO membrane assembly and the water permeable holes of the first central tube, the conveyance of pure water is realized, greatly increasing the volume of pure water inside the housing, which can slow down the phenomenon of forward osmosis, effectively reduce the concentration of pure water during the static process, so as to reduce the TDS value of the first glass of water and improve the user experience. Description of the drawings

[0019] Figure 1 It is a schematic structural diagram of the filter element provided by the utility model;

[0020] Figure 2 It is a first sectional view structure diagram of the filter element provided by the utility model;

[0021] Figure 3 It is a second sectional view structure diagram of the filter element provided by the utility model.

[0022] Description of main component symbols: 1 - housing, 11 - connection base, 111 - connection block, 12 - pure water port, 13 - water inlet, 14 - concentrated water port, 15 - operation block, 151 - operation slot, 21 - pure water adapter, 211 - pure water flow channel, 212 - water inlet flow channel, 22 - first collar, 23 - first seal, 24 - second seal, 25 - pure water end cap, 26 - third seal, 27 - fourth seal, 31 - water inlet adapter, 32 - fifth seal, 33 - second collar, 34 - sixth seal, 35 - seventh seal, 36 - concentrated water end cap, 361 - concentrated water flow channel, 37 - eighth seal, 38 - ninth seal, 4 - first central tube, 41 - water permeable holes, 5 - second central tube, 6 - RO membrane module, 7 - cavity. Detailed implementation mode

[0023] The present utility model provides a filter element with a double-layer central tube. To make the purpose, technical solution and effects of the present utility model clearer and more definite, the following takes examples with reference to the attached drawings to further elaborate on the present utility model in detail.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings, and is only for the convenience of describing the present utility model and simplifying the description, and cannot be construed as a limitation to the present utility model; in addition, terms such as "installation" and "connection" should be understood in a broad sense, and for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] Please refer to Figures 1 to 3 , the present utility model provides a filter element with a double-layer central tube, including a housing 1, an inlet joint assembly, a pure water adapter assembly, a first central tube 4, a second central tube 5 and an RO membrane module 6 are arranged inside the housing 1; one end and the other end of the first central tube 4 are respectively connected to the inlet joint assembly and the pure water adapter assembly; the first central tube 4 is disposed outside the second central tube 5, the RO membrane module 6 is disposed outside the first central tube 4, and a plurality of water permeable holes 41 are respectively opened on both sides of the first central tube 4; one end of the housing 1 is provided with a water inlet 13, a pure water port 12 and a concentrated water port 14, one end of the second central tube 5 is connected to the water inlet 13 through the inlet joint assembly, and the other end of the second central tube 5 is communicated with the inner cavity of the pure water adapter assembly.

[0026] The present application discloses a filter element with a double-layer central tube. Water inlet is realized through the second central tube 5, reducing the volume of the water inlet in the housing 1. Then, through the pure water transfer assembly cooperating with the RO membrane assembly 6 and the water permeable holes 41 of the first central tube 4, the conveyance of pure water is realized, greatly increasing the volume of pure water in the housing 1, which can slow down the forward osmosis phenomenon, effectively reduce the concentration of pure water during the static process, so as to reduce the TDS value of the first glass of water and improve the user experience.

[0027] In this embodiment, the RO membrane is a prior art and will not be elaborated here.

[0028] Further, please refer to Figure 2 and Figure 3 , the pure water transfer assembly includes a pure water adapter 21. A pure water flow channel 211 is provided at the bottom of the pure water adapter 21, and a water inlet flow channel 212 is provided in the middle of the pure water adapter 21. The other end of the second central tube 5 is connected to the water inlet end of the water inlet flow channel 212. An outlet is provided at the water outlet end of the water inlet flow channel 212, and the outlet is used to convey the water inlet to the RO membrane assembly 6. The input end of the pure water flow channel 211 is communicated with the inner cavity of the first central tube 4, and the output end of the pure water flow channel 211 is used to convey pure water to the pure water port 12.

[0029] Further, please refer to Figure 2 and Figure 3 , the pure water transfer assembly further includes a first collar 22, a first seal 23 and a second seal 24. One end of the first collar 22 is looped around the other end of the second central tube 5, and the other end of the first collar 22 is located in the water inlet flow channel 212. The first seal 23 is arranged at the connection between the first collar 22 and the water inlet flow channel 212. The second seal 24 is arranged at the connection between the pure water adapter 21 and the first central tube 4.

[0030] In this embodiment, the first collar 22 is an L-shaped collar, and the first collar 22 is ultrasonically welded to the inner wall of the pure water adapter 21. Arranging the first collar 22 helps to optimize the flow channel design, reduce the fluid resistance, improve the flow efficiency of pure water, and ensure the stability of the pure water adapter 21 during rotation. And through the combined use of the first seal 23 and the second seal 24, the liquid leakage is effectively prevented, ensuring the sealing performance of the pure water transfer assembly. Further, the combined use of the first collar 22 and the two seals reduces the direct friction between components, thereby extending the service life of the pure water transfer assembly.

[0031] Further, please refer to Figure 2 and Figure 3, the pure water transfer assembly further includes a pure water end cap 25 and a third seal 26. The other end of the pure water adapter 21 is connected to the inner cavity of the other end of the pure water end cap 25. The third seal 26 is disposed at the connection between the pure water adapter 21 and the pure water end cap 25. The pure water end cap 25 is detachably connected to the inner wall of the housing 1. A drainage channel is formed between the outer side of the pure water end cap 25 and the inner wall of the housing 1. The other end of the water outlet end cap is provided with a drainage port. The pure water channel 211 is connected to the pure water port 12 through the drainage port and the drainage channel.

[0032] In this embodiment, the other end of the pure water adapter 21 is ultrasonically welded to the inner wall of the pure water end cap 25. A clamping block is provided on the outer wall of the pure water end cap 25, and a clamping groove is formed on the inner wall of the housing 1. The detachable connection between the pure water end cap 25 and the housing 1 is realized by the cooperation of the clamping block and the clamping groove.

[0033] Further, please refer to Figure 2 and Figure 3 , a cavity 7 is further provided in the housing 1. The cavity 7 surrounds the outside of the RO membrane module 6. The pure water transfer assembly further includes a fourth seal 27. One end of the pure water end cap 25 surrounds the outside of the cavity 7. The fourth seal 27 is located between the inner wall of the pure water end cap 25 and the outer wall of the cavity 7.

[0034] In this embodiment, by providing the cavity 7, during the initial water passing stage of the filter element, the problem of unexpected water flow-through between the RO membrane modules 6 caused by the significant pressure difference between the inside and the outside can be effectively solved, and the stability and reliability of the filter element during operation are improved.

[0035] In this embodiment, the third seal 26 is disposed at the connection between the pure water adapter 21 and the pure water end cap 25, ensuring the sealing performance of the connection part and avoiding the problem of pure water leakage. The fourth seal 27 is located between the inner wall of the pure water end cap 25 and the outer wall of the cavity 7, effectively preventing external pollutants from entering the cavity 7, protecting the RO membrane module 6, and ensuring the quality of pure water. Further, through the setting of the third seal 26 and the fourth seal 27, the structural stability between the pure water transfer assembly and the housing 1 is enhanced, and the risk of loosening or damage caused by vibration or pressure change is reduced.

[0036] Further, please refer to Figure 2 and Figure 3, the water inlet joint assembly includes a water inlet adapter 31 and a fifth seal 32; a limit seat is arranged in the housing 1, one end of the water inlet adapter 31 is located in the limit seat, and the fifth seal 32 is arranged between the water inlet adapter 31 and the inner wall of the limit seat; one end of the second central tube 5 is communicated with the water inlet 13 through the inner cavity of the water inlet adapter 31.

[0037] In this embodiment, by providing the fifth seal 32, the sealing performance of the water inlet joint assembly is ensured; specifically, the fifth seal 32 is arranged between the water inlet adapter 31 and the inner wall of the limit seat, which can effectively prevent water or other fluids from leaking at the connection, ensuring the safety and stability during the fluid transmission process; and the fifth seal 32 can also reduce mechanical wear caused by vibration or pressure changes, extending the service life of the water inlet joint assembly.

[0038] Further, please refer to Figure 2 and Figure 3 , the water inlet joint assembly further includes a second collar 33, a sixth seal 34 and a seventh seal 35; the other end of the second collar 33 is sleeved on one end of the second central tube 5, one end of the second collar 33 is located in the inner cavity of the water inlet adapter 31, and the sixth seal 34 is arranged at the connection between the second collar 33 and the water inlet adapter 31; the seventh seal 35 is arranged at the connection between the water inlet adapter 31 and the first central tube 4.

[0039] In this embodiment, the second collar 33 is an L-shaped collar, and the second collar 33 is ultrasonically welded to the inner wall of the water inlet adapter 31; providing the second collar 33 helps to optimize the flow channel design, reduce fluid resistance, improve the flow efficiency of the inlet water, and ensure the stability of the water inlet adapter 31 during rotation, and through the combined use of the sixth seal 34 and the seventh seal 35, effectively prevents liquid leakage and ensures the sealing performance of the water inlet joint assembly; further, the combined use of the second collar 33 and the two seals reduces the direct friction between components, thereby extending the service life of the water inlet joint assembly.

[0040] Further, please refer to Figure 2 and Figure 3, the water inlet joint assembly further includes a concentrated water end cap 36, an eighth seal 37 and a ninth seal 38. A fixed seat is provided in the housing 1. One end of the concentrated water end cap 36 is arranged in the fixed seat, and the eighth seal 37 is located between the outer wall of the concentrated water end cap 36 and the inner wall of the fixed seat; a concentrated water flow channel 361 is formed between the inner cavity of the concentrated water end cap 36 and the inner wall of the fixed seat. The water inlet end of the concentrated water flow channel 361 is communicated with the RO membrane module 6, and the water outlet end of the concentrated water flow channel 361 is communicated with the concentrated water port 14; the other end of the concentrated water end cap 36 surrounds the outside of the cavity 7, and the ninth seal 38 is located between the inner wall of the concentrated water end cap 36 and the outer wall of the cavity 7.

[0041] In this embodiment, the eighth seal 37 is located between the outer wall of the concentrated water end cap 36 and the inner wall of the fixed seat, effectively preventing the liquid inside the concentrated water flow channel 361 from leaking, and ensuring the tight combination between the concentrated water end cap 36 and the fixed seat; the ninth seal 38 is located between the inner wall of the concentrated water end cap 36 and the outer wall of the cavity 7, further strengthening the seal between the concentrated water end cap 36 and the cavity 7, ensuring that the liquid at the connection between the concentrated water end cap 36 and the cavity 7 will not leak out; through the double-seal design formed by the eighth seal 37 and the ninth seal 38, the sealing reliability of the entire water inlet joint assembly is improved, avoiding the decline in filtration performance caused by poor sealing, and enhancing the stability and safety during the operation of the filter element.

[0042] In this embodiment, when the filter element is working, tap water enters the housing 1 through the water inlet 13, and then sequentially passes through the water inlet adapter 31, the second central tube 5 and the water inlet flow channel 212, and is output from the water outlet of the water inlet flow channel 212 into the RO membrane module 6 for filtration. During the filtration process, pure water enters the inner cavity of the first central tube 4 through a plurality of water permeable holes 41 on the first central tube 4, and then enters the drainage flow channel through the pure water flow channel 211 on the pure water adapter 21 and the drainage port on the pure water end cap 25, and is then output outside the housing 1 through the pure water port 12; the concentrated water is output outside the housing 1 through the concentrated water flow channel 361 on the concentrated water end cap 36 and the concentrated water port 14 on the housing 1.

[0043] In this embodiment, the concentrated water is output through the concentrated water flow channel 361 on the concentrated water end cap 36, greatly reducing the volume of the concentrated water in the housing 1, which can relieve the forward osmosis phenomenon to a certain extent, reduce the concentration of pure water during the static process, and thus reduce the TDS value of the first glass of water.

[0044] In this embodiment, the first seal 23, the second seal 24, the third seal 26, the fourth seal 27, the fifth seal 32, the sixth seal 34, the seventh seal 35, the eighth seal 37 and the ninth seal 38 can be sealing rubber rings.

[0045] Further, please refer to Figure 1 , one end of the housing 1 is provided with a connecting seat 11, and the water inlet 13, the concentrated water outlet 14 and the pure water outlet 12 are opened at the end of the connecting seat 11; a connecting block 111 is arranged on the side of the connecting seat 11.

[0046] In this embodiment, the connecting seat 11 and the housing 1 are integrally formed, and the connecting block 111 and the connecting seat 11 are integrally formed. The connecting block 111 is used to realize the clamping connection between the filter element and the water treatment device, that is, the filter element and the water treatment device are detachably connected. When the filtering effect of the filter element does not meet the use requirements, it is convenient to replace the filter element separately, improve the maintenance efficiency and reduce the maintenance cost.

[0047] Further, please refer to Figure 1 , the other end of the housing 1 is provided with an operation block 15, and an operation groove 151 is opened on the side of the operation block 15.

[0048] In this embodiment, the operation block 15 and the housing 1 are integrally formed; by providing the operation groove 151 on the operation block 15, it is convenient for the user to rotate and install or rotate and disassemble the filter element, so as to realize the clamping connection between the filter element and the water treatment device or to disconnect the connection relationship between the filter element and the water treatment device.

[0049] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solution and the inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A filter element with a double-layer central tube, comprising a housing, characterized in that, An inlet joint assembly, a pure water transfer assembly, a first central tube, a second central tube and an RO membrane assembly are arranged inside the housing; one end and the other end of the first central tube are respectively connected to the inlet joint assembly and the pure water transfer assembly; the first central tube is disposed outside the second central tube, the RO membrane assembly is disposed outside the first central tube, and a plurality of water permeable holes are respectively formed on both sides of the first central tube; one end of the housing is provided with an inlet, a pure water outlet and a concentrated water outlet, one end of the second central tube is connected to the inlet through the inlet joint assembly, and the other end of the second central tube communicates with the inner cavity of the pure water transfer assembly.

2. The filter element with a double-layer central tube according to claim 1, characterized in that, The pure water transfer assembly includes a pure water adapter, a pure water flow channel is arranged at the bottom of the pure water adapter, and a water inlet flow channel is arranged in the middle of the pure water adapter; the other end of the second central tube is connected to the water inlet end of the water inlet flow channel, a water outlet is arranged at the water outlet end of the water inlet flow channel, and the water outlet is used for delivering the inlet water to the RO membrane assembly; the input end of the pure water flow channel communicates with the inner cavity of the first central tube, and the output end of the pure water flow channel is used for delivering the pure water to the pure water outlet.

3. The filter element with a double-layer central tube according to claim 2, characterized in that, The pure water transfer assembly further includes a first collar, a first seal and a second seal. One end of the first collar is looped on the other end of the second central tube, and the other end of the first collar is located in the water inlet flow channel. The first seal is arranged at the connection between the first collar and the water inlet flow channel; the second seal is arranged at the connection between the pure water adapter and the first central tube.

4. The filter element with a double-layer central tube according to claim 2, wherein, The pure water transfer assembly further includes a pure water end cap and a third seal. The other end of the pure water adapter is connected to the inner cavity of the other end of the pure water end cap, and the third seal is arranged at the connection between the pure water adapter and the pure water end cap; the pure water end cap is detachably connected to the inner wall of the housing, a drainage flow channel is formed between the outer side of the pure water end cap and the inner wall of the housing, a drainage port is formed at the other end of the pure water end cap, and the pure water flow channel is connected to the pure water outlet through the drainage port and the drainage flow channel.

5. The filter element with a double-layer central tube according to claim 4, characterized in that, A cavity is further arranged inside the housing, the cavity is disposed outside the RO membrane assembly, and the pure water transfer assembly further includes a fourth seal; one end of the pure water end cap is looped outside the cavity, and the fourth seal is located between the inner wall of the pure water end cap and the outer wall of the cavity.

6. The filter element with a double-layer central tube according to claim 5, wherein, The inlet joint assembly includes an inlet adapter and a fifth seal; a limit seat is arranged inside the housing, one end of the inlet adapter is located inside the limit seat, and the fifth seal is arranged between the inlet adapter and the inner wall of the limit seat; one end of the second central tube communicates with the inlet through the inner cavity of the inlet adapter.

7. A filter element with a double-layer central tube according to claim 6, characterized in that, The water inlet joint assembly further includes a second collar, a sixth seal and a seventh seal; the other end of the second collar is sleeved on one end of the second central tube, one end of the second collar is located in the inner cavity of the water inlet adapter, and the sixth seal is arranged at the connection between the second collar and the water inlet adapter; the seventh seal is arranged at the connection between the water inlet adapter and the first central tube.

8. The filter element with a double-layer central tube according to claim 6, characterized in that, The water inlet joint assembly further includes a concentrated water end cover, an eighth seal and a ninth seal. A fixed seat is arranged in the housing. One end of the concentrated water end cover is arranged in the fixed seat, and the eighth seal is located between the outer wall of the concentrated water end cover and the inner wall of the fixed seat; a concentrated water flow channel is formed between the inner cavity of the concentrated water end cover and the inner wall of the fixed seat. The water inlet end of the concentrated water flow channel is communicated with the RO membrane assembly, and the water outlet end of the concentrated water flow channel is communicated with the concentrated water port; the other end of the concentrated water end cover surrounds the outside of the cavity, and the ninth seal is located between the inner wall of the concentrated water end cover and the outer wall of the cavity.

9. The filter element with a double-layer central tube according to claim 1, characterized in that, One end of the housing is provided with a connection seat, and the water inlet, the concentrated water port and the pure water port are opened at the end of the connection seat; connection blocks are arranged on the side of the connection seat.

10. A filter element with a double-layer central tube according to claim 1, characterized in that, The other end of the housing is provided with an operation block, and an operation groove is opened on the side of the operation block.

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