Composite filter element and water purifier

Abstract

The invention relates to the technical field of water drinking devices, and particularly provides a composite filter element and a water purifier. The composite filter element comprises a first cylindrical shell, a reverse osmosis membrane core, a rear carbon core and an end cover assembly, wherein the first cylindrical shell internally comprises a first chamber and a second chamber which are isolated from each other; the reverse osmosis membrane core is positioned in the first chamber, and the rear carbon core is positioned in the second chamber; the end cover assembly is located at one end of the first cylindrical shell, the reverse osmosis membrane core and the rear carbon core are plugged in the first cavity and the second cavity respectively through the end cover assembly, a first connector communicated with the first cavity and a second connector communicated with the second cavity are formed in the end cover assembly, and the size of the second cavity is larger than that of the first cavity. When pure water with a high TDS value enters the second chamber along the water path, the amount of water remaining in the second chamber is far greater than the amount of pure water with a high TDS value entering the second chamber, and the pure water is filtered by the rear carbon core and diluted to a low level, so that the TDS value of effluent of the composite filter element is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of drinking water devices, and particularly provides a composite filter element and a water purifier. Background Art

[0002] In existing composite filter elements, a series-connected reverse osmosis membrane and a post-carbon core are usually provided to simplify the water circuit structure.

[0003] When the water purifier stops, the raw water and concentrated water in the reverse osmosis membrane cavity cause the TDS concentration on the side of the pure water and the carbon core soaked in pure water to be too high under the action of osmotic pressure. When the user takes water again, it is easy to cause the TDS value in the first glass of water to be too high, resulting in problems such as a decline in the taste of drinking water or scale formation when boiling water. By draining water or circulating water to reduce the TDS value, the user has to wait for a long time or waste water resources, and the user experience is not good.

[0004] Correspondingly, there is a need in the art for a new composite filter element to solve the above problems. Summary of the Invention

[0005] In order to solve the above problems in the prior art, that is, to solve the problem that the TDS value of the water output after the existing composite filter element stands still is too high.

[0006] In a first aspect, the present invention provides a composite filter element, which includes: a first cylindrical housing, which includes a first chamber and a second chamber isolated from each other therein; a reverse osmosis membrane core, which is located in the first chamber; a post-carbon core, which is located in the second chamber; and an end cap assembly, which is located at one end of the first cylindrical housing, and the end cap assembly seals the reverse osmosis membrane core and the post-carbon core in the first chamber and the second chamber respectively. The end cap assembly is provided with a first interface communicated with the first chamber and a second interface communicated with the second chamber; wherein, the volume of the second chamber is larger than the volume of the first chamber.

[0007] In the case of the preferred technical solution of the above composite filter element, the volume of the second chamber is at least twice the volume of the first chamber.

[0008] In the case of the preferred technical solution of the above composite filter element, the composite filter element further includes a second cylindrical housing, a first end cap located at the bottom of the second cylindrical housing, and a second end cap sleeved outside the second cylindrical housing. The second cylindrical housing is located inside the first cylindrical housing. The first chamber is formed inside the second cylindrical housing, and the second chamber is formed between the outer wall of the first cylindrical housing and the outer wall of the second cylindrical housing. The second end cap, the first cylindrical housing, and the second cylindrical housing are all fixedly connected to the end cap assembly, and the end cap assembly presses the second end cap so that the post-carbon core is clamped and fixed between the first end cap and the second end cap.

[0009] In the case of the preferred technical solution of the above-mentioned composite filter element, the end cover assembly includes an outer shell cover, a pressure plate and a turntable, the first interface and the second interface are both formed on the turntable, the outer shell cover is sealedly connected to the first cylindrical shell, one end face of the pressure plate is sealedly connected to the second cylindrical shell, the turntable is movably connected to the outer shell cover, and a water hole is provided on the pressure plate. The turntable is rotated so that the first interface and the second interface are opposite to or staggered with the water hole on the pressure plate.

[0010] In the case of the preferred technical solution of the above-mentioned composite filter element, a limiting groove is provided on one of the pressure plate or the rotating plate, and a protrusion matching with the limiting groove is provided on the other of the pressure plate or the rotating plate.

[0011] In the case of the preferred technical solution of the above-mentioned composite filter element, the end cover assembly also includes a sealing gasket located between the pressure plate and the rotating plate.

[0012] In the case of the preferred technical solution of the above-mentioned composite filter element, the sealing gasket is fixed against the other end surface of the pressure plate.

[0013] In the case of the preferred technical solution of the above-mentioned composite filter element, the first interface includes a first water inlet interface, a first pure water interface and a first concentrated water interface; wherein, the first pure water interface is located at the axial position of the turntable, the first water inlet interface and the first concentrated water interface are located at the non-axial position of the turntable, and a one-way valve is provided in the first pure water interface.

[0014] In the case of the preferred technical solution of the above-mentioned composite filter element, a first gap flow channel is formed between the outer wall of the post-carbon core and the inner wall of the first cylindrical shell, a second gap flow channel is formed between the inner wall of the post-carbon core and the outer wall of the second cylindrical shell, and the second interface includes a second water inlet interface and a second water outlet interface located at a non-axial position of the turntable, the first gap flow channel is connected to the second water inlet interface, and the second gap flow channel is connected to the second water outlet interface.

[0015] In a second aspect, the present invention further provides a water purifier, which includes the composite filter element.

[0016] Those skilled in the art can understand that the composite filter element of the present invention includes a first cylindrical shell, a reverse osmosis membrane core, a post-carbon core, and an end cap assembly. Among them, the first cylindrical shell includes a first chamber and a second chamber that are isolated from each other; the reverse osmosis membrane core is located in the first chamber, and the post-carbon core is located in the second chamber; the end cap assembly is located at one end of the first cylindrical shell, and the end cap assembly seals the reverse osmosis membrane core and the post-carbon core in the first chamber and the second chamber respectively. The end cap assembly is provided with a first interface communicating with the first chamber and a second interface communicating with the second chamber, and the volume of the second chamber is larger than the volume of the first chamber. Through such a setting, when the composite filter element is stationary in the water circuit system for a long time, the TDS value of the pure water on the reverse osmosis membrane core side increases. When the pure water with a high TDS value enters the second chamber along the water circuit, the retained water volume in the second chamber is much larger than the volume of the pure water with a high TDS value entering the second chamber. The pure water is filtered by the post-carbon core and diluted to a lower level, greatly reducing the TDS value of the water output from the composite filter element.

[0017] Further, the volume of the second chamber is at least twice the volume of the first chamber. Through such a setting, the overall volume of the composite filter element and the TDS value of the water output are both maintained at appropriate levels, ensuring that the composite filter element does not occupy too much installation space and does not affect the water output quality of the composite filter element.

[0018] Further, the composite filter element further includes a second cylindrical shell, a first end cap located at the bottom of the second cylindrical shell, and a second end cap sleeved outside the second cylindrical shell. The second cylindrical shell is located inside the first cylindrical shell, the first chamber is formed inside the second cylindrical shell, and the second chamber is formed between the outer wall of the first cylindrical shell and the outer wall of the second cylindrical shell. The second end cap, the first cylindrical shell, and the second cylindrical shell are all fixedly connected to the end cap assembly, and the end cap assembly presses the second end cap so that the post-carbon core is clamped and fixed between the first end cap and the second end cap. Through such a setting, it is convenient for the installation and disassembly of the composite filter element, and the cost is low.

[0019] Further, the end cap assembly includes an outer shell cover, a pressure plate, and a turntable. The first interface and the second interface are both formed on the turntable. The outer shell cover is hermetically connected to the first cylindrical shell, one end face of the pressure plate is hermetically connected to the second cylindrical shell, the turntable is movably connected to the outer shell cover, and the pressure plate is provided with water passing holes. Rotate the turntable so that the first interface and the second interface are opposite or misaligned with the water passing holes on the pressure plate. Through such a setting, when replacing or when the composite filter element is stationary, rotate the turntable to close the water flow in the first cylindrical shell and the second cylindrical shell, avoiding water leakage during disassembly or the diffusion of the purified water with a high TDS value along the water flow to the second chamber.

[0020] Further, the end cap assembly further includes a gasket located between the pressure plate and the turntable. Through such a setting, the risk of water leakage generated by the rotation of the turntable is reduced, and the use safety of the composite filter element is improved.

[0021] Furthermore, the first interface includes a first water inlet interface, a first pure water interface, and a first concentrated water interface; wherein, the first pure water interface is located at the axis position of the turntable, the first water inlet interface and the first concentrated water interface are located at non-axis positions of the turntable, and a check valve is provided in the first pure water interface. With such an arrangement, when replacing the composite filter element, the check valve is used to block the first pure water interface to avoid water leakage from the filter element during the replacement process.

[0022] In addition, the water purifier further provided by the present invention based on the above technical solution, due to the adoption of the above composite filter element, thus has the technical effects possessed by the above composite filter element. Compared with the existing water purifiers, the water discharged from the head cup of the water purifier of the present invention can be directly drunk, improving the user experience. Description of the Drawings

[0023] The preferred embodiments of the present invention will be described below with reference to the drawings, in which:

[0024] Figure 1 is an exploded structural schematic diagram of the composite filter element of the present invention;

[0025] Figure 2 is an axial sectional structural schematic diagram of the composite filter element of the present invention;

[0026] Figure 3 is an exploded structural schematic diagram of the end cap assembly of the present invention;

[0027] Figure 4 is a structural schematic diagram of the turntable of the end cap assembly of the present invention.

[0028] List of Reference Numerals:

[0029] 1. First cylindrical shell; 11. First interstitial flow channel; 12. Second interstitial flow channel; 2. Post-carbon core; 21. First end cap; 22. Second end cap; 3. Reverse osmosis membrane core; 31. Central tube; 311. Water permeable holes; 32. Reverse osmosis membrane; 4. Second cylindrical shell; 41. Sleeve body; 42. Cylindrical cover; 51. Outer shell cover; 52. Pressing disc; 521. First water passing hole; 522. Second water passing hole; 523. Third water passing hole; 524. Fourth water passing hole; 525. Fifth water passing hole; 526. Limiting groove; 53. Turntable; 531. First pure water interface; 532. First water inlet interface; 533. First concentrated water interface; 534. Second water inlet interface; 535. Second water outlet interface; 536. Projection; 54. Sealing gasket; 541. First through hole; 542. Second through hole; 543. Third through hole; 544. Fourth through hole; 545. Fifth through hole. Detailed Embodiments

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0031] It should be noted that in the description of the present invention, the terms "upper", "lower", "inner", "outer", "top", "bottom", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0032] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, the terms "first", "second", "third", "fourth", and "fifth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] Based on the problem pointed out in the background art that the TDS value of the water output after the existing composite filter element stands still is too high. The present invention provides a composite filter element, aiming to increase the space of the rear part of the composite filter element to dilute the pure water with a higher TDS, so as to eliminate the "first cup of water" effect of the composite filter element and improve the user experience.

[0034] Specifically, as Figures 1 to 4 shown, the composite filter element of the present invention includes a first cylindrical housing 1, a reverse osmosis membrane core 3, a post-carbon core 2, and an end cap assembly. Among them, the first cylindrical housing 1 includes a first chamber and a second chamber that are isolated from each other; the reverse osmosis membrane core 3 is located in the first chamber, and the post-carbon core 2 is located in the second chamber; the end cap assembly is located at one end of the first cylindrical housing 1, and the end cap assembly seals the reverse osmosis membrane core 3 and the post-carbon core 2 in the first chamber and the second chamber respectively. The end cap assembly is provided with a first interface communicating with the first chamber and a second interface communicating with the second chamber, and the volume of the second chamber is larger than the volume of the first chamber.

[0035] It is understandable that when the composite filter element is connected to the water circuit system, raw water enters the first chamber and is filtered by the reverse osmosis membrane element 3 to produce pure water. The pure water enters the second chamber through the water circuit and is filtered by the post-carbon element 2 to output potable purified water. The volume of the second chamber of the composite filter element of the present invention is larger than that of the first chamber. After the composite filter element is connected to the water circuit system and stands still, due to the reverse osmosis effect of the reverse osmosis membrane 32, the TDS value of the pure water on one side of the reverse osmosis membrane element 3 increases. After the pure water with a higher TDS value enters the second chamber along the water circuit, since a large amount of water can be retained in the second chamber, the retained water volume in the second chamber can dilute the pure water with a higher TDS value, thereby keeping the TDS value in the second chamber at an appropriate level. When the water in the second chamber is filtered by the post-carbon element 2 and discharged, the purified water finally flowing out of the composite filter element can reach the level that users can directly drink, avoiding the exceeding of the TDS value of the "first cup of water" in the composite filter element. Compared with the existing composite filter element with a relatively small-volume post-carbon element 2, when using the composite filter element of the present invention, it is not necessary to flush the side of the reverse osmosis membrane element 3, saving the user's water intake time and water resources and improving the user experience.

[0036] It should be noted that according to actual applications, those skilled in the art can segment the first chamber and the second chamber of the first cylindrical shell 1 along the axial direction of the first cylindrical shell 1. Alternatively, the first chamber and the second chamber can also be arranged side by side along the radial direction of the first cylindrical shell 1. Alternatively, the first chamber and the second chamber can also be coaxially arranged, etc. Such flexible adjustment and change of the specific position structure of the first chamber and the second chamber of the first cylindrical shell 1 do not deviate from the basic principles and scope of the present invention and should all be defined within the protection scope of the present invention.

[0037] Preferably, as Figures 1 to 4 shown, the composite filter element of the present invention further includes a second cylindrical shell 4, a first end cap 21 located at the bottom of the second cylindrical shell 4, and a second end cap 22 sleeved outside the second cylindrical shell 4. The second cylindrical shell 4 is located inside the first cylindrical shell 1. The first chamber is formed inside the second cylindrical shell 4, and the second chamber is formed between the outer wall of the first cylindrical shell 1 and the outer wall of the second cylindrical shell 4. The second end cap 22, the first cylindrical shell 1, and the second cylindrical shell 4 are all fixedly connected to the end cap assembly. The end cap assembly presses the second end cap 22 to clamp and fix the post-carbon element 2 between the first end cap 21 and the second end cap 22.

[0038] Exemplarily, as Figures 1 to 4As shown, the second cylindrical housing 4 of the present invention is located within the first cylindrical housing 1 and the second cylindrical housing 4 is coaxially arranged with the first cylindrical housing 1. Among them, the second cylindrical housing 4 includes a sleeve body 41 and a cylinder cover 42, the reverse osmosis membrane core 3 includes a central tube 31 and a reverse osmosis membrane 32 wrapped around the central tube 31, a plurality of water permeable holes 311 are provided in the circumferential direction of the central tube 31, the post-carbon core 2 is in an annular cylindrical structure, and the second end cover 22 is in an annular structure.

[0039] When assembling the composite filter element, the reverse osmosis membrane core 3 is inserted into the sleeve body 41 and the reverse osmosis membrane core 3 is encapsulated and fixed by means of the cylinder cover 42. The first end cover 21 is placed at the bottom of the chamber of the first cylindrical housing 1, the bottom of the sleeve body 41 is pressed against the first end cover 21, the post-carbon core 2 surrounds the outside of the first cylindrical housing 1, the bottom of the post-carbon core 2 abuts against the first end cover 21, the second end cover 22 surrounds the outside of the first cylindrical housing 1 and axially abuts against the top of the post-carbon core 2. After being hermetically connected to the upper end of the first cylindrical housing 1 by means of the end cover assembly, the second end cover 22 is pressed by means of the end cover assembly so that the post-carbon core 2 is clamped and fixed between the second end cover 22 and the first end cover 21. In addition, the cylinder cover 42 and the sleeve body 41 are pressed by means of the end cover assembly so that the second cylindrical housing 4 is fixed in the axial position of the first cylindrical housing 1. Through such an arrangement, the assembly and disassembly operations of the composite filter element are simple and the cost is low.

[0040] Preferably, as Figure 2 shown, the volume of the second chamber of the present invention is at least twice the volume of the first chamber.

[0041] Exemplarily, as Figure 2 shown, the inner diameter of the second cylindrical housing 4 of the present invention is twice the inner diameter of the first cylindrical housing 1. Therefore, after conversion, the volume of the second chamber is three times the volume of the first chamber.

[0042] It can be understood that the larger the second chamber of the first cylindrical housing 1 is set, the more water is retained, and thus the pure water with a higher TDS value entering the second chamber can be diluted to a lower level.

[0043] It should be noted that according to actual applications, those skilled in the art can, on the premise that the water output of the composite filter element can reach the user's drinking level, keep the ratio between the first chamber and the second chamber within a reasonable numerical range, and optimize the overall composite filter element without occupying too much installation space.

[0044] Preferably, as Figures 3 to 4As shown in the figure, the end cover assembly of the present invention includes a housing cover 51, a pressure plate 52, and a rotating disk 53. The first interface and the second interface are both formed on the rotating disk 53. The housing cover 51 is hermetically connected to the first cylindrical shell 1, one end face of the pressure plate 52 is hermetically connected to the second cylindrical shell 4, the rotating disk 53 is movably connected to the housing cover 51, and the pressure plate 52 is provided with water passing holes. The rotating disk 53 is rotated so that the first interface and the second interface are arranged opposite to or misaligned with the water passing holes on the pressure plate 52.

[0045] Exemplarily, as Figures 3 to 4 shown in the figure, the first interface of the present invention includes a first water inlet interface 532, a first pure water interface 531, and a first concentrated water interface 533. The first pure water interface 531 is located at the axial center position of the rotating disk 53, and the first water inlet interface 532 and the first concentrated water interface 533 are located at non-axial center positions of the rotating disk 53. The second interface includes a second water inlet interface 534 and a second water outlet interface 535 located at non-axial center positions of the rotating disk 53. Among them, the first water inlet interface 532, the first concentrated water interface 533, the second water inlet interface 534, and the second water outlet interface 535 are all circumferentially and uniformly arranged around the first pure water interface 531.

[0046] As Figures 2 to 3 shown in the figure, a first gap flow channel 11 is formed between the outer wall of the post-carbon core 2 of the present invention and the inner wall of the first cylindrical shell 1, and a second gap flow channel 12 is formed between the inner wall of the post-carbon core 2 and the outer wall of the second cylindrical shell 4. The first gap flow channel 11 is communicated with the second water inlet interface 534, and the second gap flow channel 12 is communicated with the second water outlet interface 535. In addition, the upper end of the central tube 31 of the reverse osmosis membrane core 3 is communicated with the first pure water interface 531, the water inlet end of the reverse osmosis membrane 32 is communicated with the first water inlet interface 532, and the concentrated water end of the reverse osmosis membrane 32 is communicated with the first concentrated water interface 533.

[0047] It should be noted that when the composite filter element is connected to the water circuit system, the first pure water interface 531 is communicated with the second water inlet interface 534 through the water circuit.

[0048] As Figures 3 to 4 shown in the figure, the pressure plate 52 of the end cover assembly of the present invention is provided with a plurality of water passing holes. The water passing holes include a first water passing hole 521, a second water passing hole 522, a third water passing hole 523, a fourth water passing hole 524, and a fifth water passing hole 525. Among them, the first water passing hole 521 is located at the axial center position of the pressure plate 52, and the second water passing hole 522, the third water passing hole 523, the fourth water passing hole 524, and the fifth water passing hole 525 are all circumferentially and uniformly arranged around the first water passing hole 521. The first water passing hole 521, the second water passing hole 522, the third water passing hole 523, the fourth water passing hole 524, and the fifth water passing hole 525 respectively correspond to the first pure water interface 531, the first water inlet interface 532, the first concentrated water interface 533, the second water inlet interface 534, and the second water outlet interface 535.

[0049] When the turntable 53 rotates relative to the pressure plate 52 to the conducting state, the second water passing hole 522, the third water passing hole 523, the fourth water passing hole 524, and the fifth water passing hole 525 are respectively arranged opposite to the first water inlet interface 532, the first concentrated water interface 533, the second water inlet interface 534, and the second water outlet interface 535.

[0050] When the turntable 53 rotates relative to the pressure plate 52 to the blocking state, the second water passing hole 522, the third water passing hole 523, the fourth water passing hole 524, and the fifth water passing hole 525 are respectively arranged out of alignment with the first water inlet interface 532, the first concentrated water interface 533, the second water inlet interface 534, and the second water outlet interface 535. In this way, after the filter element or the composite filter element is replaced and left standing, the turntable 53 can be used to cut off and block the second water inlet interface 534, preventing the pure water with excessive upstream TDS from entering the second chamber.

[0051] It can be understood that both the first water passing hole 521 and the first pure water interface 531 are located at the axis position. Therefore, a one-way valve is provided at the first pure water interface 531 to block the first pure water interface 531 when replacing the filter element.

[0052] Preferably, as Figures 3 to 4 shown, the end cap assembly of the present invention further includes a gasket 54 located between the pressure plate 52 and the turntable 53.

[0053] Exemplarily, as Figures 3 to 4 shown, five through holes are provided on the gasket 54. The five through holes include a first through hole 541, a second through hole 542, a third through hole 543, a fourth through hole 544, and a fifth through hole 545 respectively corresponding to the first water passing hole 521, the second water passing hole 522, the third water passing hole 523, the fourth water passing hole 524, and the fifth water passing hole 525. The bottom surface of the gasket 54 is fixedly attached to the upper end surface of the pressure plate 52, and the top surface of the gasket 54 is in close contact with the bottom surface of the turntable 53.

[0054] It can be understood that when the turntable 53 rotates relative to the gasket 54, the gasket 54 can prevent water flow from seeping out along the axial gap between the pressure plate 52 and the turntable 53, improving the sealing performance of the end cap assembly.

[0055] Preferably, as Figures 3 to 4 shown, a limiting groove 526 is provided on the other end surface of the pressure plate 52 of the present invention, and the turntable 53 is provided with a protrusion 536 that cooperates with the limiting groove 526.

[0056] Exemplarily, as Figures 3 to 4 shown, an arc-shaped limiting groove 526 is provided on the circumferential direction of the upper end surface of the pressure plate 52 of the present invention. Correspondingly, a protrusion 536 corresponding to the limiting groove 526 is provided on the bottom surface of the turntable 53.

[0057] It is understandable that during the rotation of the turntable 53 relative to the pressure plate 52, the protrusion 536 moves within the limit groove 526, which can ensure that the second water passing holes 522, third water passing holes 523, fourth water passing holes 524, and fifth water passing holes 525 on the pressure plate 52 are respectively aligned with the first water inlet interface 532, first concentrated water interface 533, second water inlet interface 534, and second water outlet interface 535, avoiding the disordered connection between the water passing holes and the interfaces.

[0058] It should be noted that according to the actual application, those skilled in the art can set the limit groove 526 on the turntable 53 and the protrusion 536 on the pressure plate 52. Such flexible adjustment and change of the limit structure between the turntable 53 and the pressure plate 52 do not deviate from the basic principle and scope of the present invention and should all be limited within the protection scope of the present invention.

[0059] Finally, the present invention also provides a water purifier, which includes the above-mentioned composite filter element.

[0060] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A composite filter element, characterized in that, Comprising: A first cylindrical housing (1) which includes a first chamber and a second chamber isolated from each other therein; A reverse osmosis membrane core (3) which is located within the first chamber; A post-carbon core (2) which is located within the second chamber; and An end cap assembly which is located at one end of the first cylindrical housing (1), the end cap assembly sealing the reverse osmosis membrane core (3) and the post-carbon core (2) within the first chamber and the second chamber respectively, and the end cap assembly being provided with a first interface communicating with the first chamber and a second interface communicating with the second chamber; Wherein, the volume of the second chamber is greater than the volume of the first chamber.

2. The composite filter element according to claim 1, wherein, The volume of the second chamber is at least twice the volume of the first chamber.

3. The composite filter element according to claim 1, characterized in that, The composite filter element further includes a second cylindrical housing (4), a first end cap (21) located at the bottom of the second cylindrical housing (4), and a second end cap (22) sleeved outside the second cylindrical housing (4), the second cylindrical housing (4) being located within the first cylindrical housing (1), the first chamber being formed within the second cylindrical housing (4), the second chamber being formed between the outer wall of the first cylindrical housing (1) and the outer wall of the second cylindrical housing (4), the second end cap (22), the first cylindrical housing (1) and the second cylindrical housing (4) all being fixedly connected to the end cap assembly, and the end cap assembly squeezing the second end cap (22) so that the post-carbon core (2) is clamped and fixed between the first end cap (21) and the second end cap (22).

4. The composite filter element according to claim 3, characterized in that The end cap assembly includes an outer shell cover (51), a pressure plate (52) and a rotating disk (53), the first interface and the second interface are both formed on the rotating disk (53), the outer shell cover (51) is hermetically connected to the first cylindrical housing (1), one end face of the pressure plate (52) is hermetically connected to the second cylindrical housing (4), the rotating disk (53) is movably connected to the outer shell cover (51), the pressure plate (52) is provided with water passing holes, and the rotating disk (53) is rotated so that the first interface and the second interface are arranged opposite to or misaligned with the water passing holes on the pressure plate (52).

5. The composite filter element according to claim 4, characterized in that, A limiting groove (526) is provided on one of the pressure plate (52) or the rotating disk (53), and a protrusion (536) cooperating with the limiting groove (526) is provided on the other of the pressure plate (52) or the rotating disk (53).

6. The composite filter element according to claim 4, wherein The end cap assembly further includes a sealing gasket (54) located between the pressure plate (52) and the rotating disk (53).

7. The composite filter element according to claim 6, wherein, The sealing gasket (54) is fixedly attached to the other end face of the pressure plate (52).

8. The composite filter element according to claim 4, wherein The first interface includes a first water inlet interface (532), a first pure water interface (531) and a first concentrated water interface (533); wherein, the first pure water interface (531) is located at the axial center position of the rotating disk (53), the first water inlet interface (532) and the first concentrated water interface (533) are located at non-axial center positions of the rotating disk (53), and a check valve is provided within the first pure water interface (531).

9. The composite filter element according to claim 8, wherein, A first gap flow channel (11) is formed between the outer wall of the rear carbon core (2) and the inner wall of the first cylindrical housing (1), and a second gap flow channel (12) is formed between the inner wall of the rear carbon core (2) and the outer wall of the second cylindrical housing (4). The second interface includes a second water inlet interface (534) and a second water outlet interface (535) located at a non-axis position of the turntable (53). The first gap flow channel (11) is communicated with the second water inlet interface (534), and the second gap flow channel (12) is communicated with the second water outlet interface (535).

10. A water purifier, characterized in that, Comprising the composite filter element according to any one of claims 1 to 9.

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