Composite filter element and water purifier

Abstract

The utility model relates to the technical field of water drinking devices, and particularly provides a composite filter element and a water purifier. Specifically, the composite filter element disclosed by the utility model comprises a shell, and a first end cover, a shell, a bidirectional flow channel pipe, a front filter assembly and a rear filter assembly which are positioned in the shell, a front water inlet, a front water outlet, a rear water inlet and a rear water outlet are formed in the end part of the shell; the front filtering assembly is clamped and fixed between the first end cover and the outer side end of the shell, the water inlet side of the front filtering assembly is communicated with the front water inlet, the water outlet side of the front filtering assembly is communicated with the front water outlet, the rear filtering assembly is located in the shell, one end of the bidirectional flow channel pipe is communicated with a cavity of the shell, and the other end of the bidirectional flow channel pipe is communicated with the cavity of the shell. And the other end of the two-way flow channel pipe penetrates through the front filtering assembly and is respectively communicated with the rear water inlet and the rear water outlet. By means of the arrangement, the composite filter element is small in size, the number of the composite filter assemblies is small, and assembling is easy and convenient.

Description

Technical Field

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

[0002] Existing water purifiers usually use two or three filter elements among a pre-filter element, a reverse osmosis filter element and a post-filter element to achieve the water purification function.

[0003] The above-mentioned multiple filter elements in the water purifier are usually installed separately, which not only occupies too much internal space of the machine, but also makes the water purifier larger and bulky, which is not conducive to the miniaturization design of the water purifier and the user experience is not good.

[0004] Accordingly, the art needs a new composite filter element to solve the above problems. Utility Model Content

[0005] In order to solve the above problems in the prior art, that is, to solve the problem that the filter element in the existing water purifier occupies too much space in the machine.

[0006] In a first aspect, the utility model provides a composite filter element, comprising a housing, a two-way flow channel pipe, a pre-filter module and a post-filter module located in the housing;

[0007] The pre-filter module and the post-filter module are distributed along the axial direction of the shell, and a pre-water inlet, a pre-water outlet, a post-water inlet and a post-water outlet are provided on the end of the shell;

[0008] The water inlet side of the pre-filter module is connected to the pre-water inlet, and the water outlet side of the pre-filter module is connected to the pre-water outlet.

[0009] One end of the two-way flow channel pipe is communicated with the chamber of the post-filter module, and the other end of the two-way flow channel pipe passes through the pre-filter module and is communicated with the post-water inlet and the post-water outlet.

[0010] In the case of the preferred technical solution of the above-mentioned composite filter element, the bidirectional flow channel tube includes a first central tube and a second central tube sleeved on the outside of the first central tube, and a first gap flow channel is formed between the outer wall of the first central tube and the inner wall of the second central tube, and the two ends of the first gap flow channel are respectively connected to the rear water inlet and the rear filter module, and the two ends of the chamber of the first central tube are respectively connected to the chamber of the rear filter module and the rear water outlet.

[0011] In the case of the preferred technical solution of the above-mentioned composite filter element, the pre-filter module includes a pre-filter assembly and a second end cover, and the pre-filter assembly is clamped and fixed between the first end cover and the post-filter module.

[0012] In the case of the preferred technical solution of the above-mentioned composite filter element, the pre-filter assembly includes an outer PP cotton core and an inner first cylindrical carbon core, the first cylindrical carbon core is sleeved on the outside of the second center tube, a second gap flow channel is formed between the outside of the PP cotton core and the inner wall of the outer shell, the second gap flow channel is connected to the pre-water inlet, a third gap flow channel is formed between the inner wall of the first cylindrical carbon core and the outer wall of the second center tube, and the third gap flow channel is connected to the pre-water outlet.

[0013] In the case of the preferred technical solution of the above-mentioned composite filter element, the post-filter module includes a shell and a post-filter assembly installed in the shell, and a fourth gap flow channel is provided between the outer wall of the post-filter assembly and the inner wall of the shell, and the fourth gap flow channel is connected to the first gap flow channel, and the chamber of the post-filter assembly is connected to the chamber of the first center tube.

[0014] In the case of the preferred technical solution of the above-mentioned composite filter element, the shell includes a cylindrical connecting shell and a second end cover sealed to one end of the cylindrical connecting shell, and the fourth gap flow channel is located between the outer wall of the post-filter assembly and the inner wall of the cylindrical connecting shell.

[0015] In the case of the preferred technical solution of the above-mentioned composite filter element, the post-filter assembly includes a second cylindrical carbon core and a third end cover and a fourth end cover for clamping and fixing the second cylindrical carbon core, the chamber of the second cylindrical carbon core is connected to the chamber of the first center tube, and the fourth gap flow channel is located between the outer wall of the second cylindrical carbon core and the inner wall of the cylindrical connecting shell.

[0016] In the case of the preferred technical solution of the above-mentioned composite filter element, the first central tube and / or the second central tube is a metal tube.

[0017] In the case of the preferred technical solution of the above-mentioned composite filter element, the first central tube is a stainless steel tube, the wall thickness of the first central tube is 0.3 to 0.5 mm, and the outer diameter of the first central tube is 5.0 mm to 7.0 mm.

[0018] In a second aspect, the utility model also provides a water purifier, which includes the composite filter element.

[0019] It can be understood by those skilled in the art that the composite filter element of the present invention includes an outer shell and a first end cap located inside the outer shell, a shell, a two-way flow channel pipe, a pre-filter assembly and a post-filter assembly; a pre-water inlet, a pre-water outlet, a post-water inlet and a post-water outlet are provided on the end of the outer shell; wherein the pre-filter assembly is clamped and fixed between the first end cap and the outer end of the shell, the water inlet side of the pre-filter assembly is connected to the pre-water inlet, the water outlet side of the pre-filter assembly is connected to the pre-water outlet, the post-filter assembly is located inside the shell, one end of the two-way flow channel pipe is connected to the chamber of the shell, and the other end of the two-way flow channel pipe passes through the pre-filter assembly and is connected to the post-water inlet and the post-water outlet respectively. Through such a setting, the pre-filter assembly and the post-filter assembly are integrated into an integral filter element, which greatly reduces the space occupied by the pre-filter element and the post-filter element in the water purifier, and the composite filter assembly is small in number, simple to assemble and low in cost.

[0020] Furthermore, the shell includes a cylindrical connection shell and a second end cap that is sealed and connected to one end of the cylindrical connection shell, the two-way flow channel includes a first central tube and a second central tube sleeved outside the first central tube, a first gap flow channel is formed between the outer wall of the first central tube and the inner wall of the second central tube, the chamber and the rear water inlet of the cylindrical connection shell are both connected to the first gap flow channel, and the chamber and the rear water outlet of the cylindrical connection shell are both connected to the first central tube. Through such an arrangement, the cylindrical connection shell, the second end cap and the two-way flow channel have a simple installation structure, are easy to disassemble and assemble, and are convenient for assembling the composite filter element.

[0021] Furthermore, the first central tube and / or the second central tube are metal tubes. Through such an arrangement, under the premise of maintaining structural strength, the radial dimensions of the first central tube and the second central tube of the metal tube can be reduced as much as possible by using metal tubes with thinner wall thickness, so as to achieve the purpose of miniaturized design of the composite filter element.

[0022] Furthermore, a fifth sealing ring is provided between the edge of the fourth end cap and the inner wall of the cylindrical connection shell. With such a configuration, when the fourth end cap clamps and fixes the second cylindrical carbon core, the fifth sealing ring is used to prevent water from leaking out through the edge of the fourth end cap and the inner wall of the cylindrical connection shell, thereby greatly enhancing the overall sealing of the shell.

[0023] In addition, the water purifier further provided by the utility model on the basis of the above-mentioned technical solution has the technical effects of the above-mentioned composite filter element due to the adoption of the above-mentioned composite filter element. Compared with the existing water purifiers, the water purifier of the utility model occupies a small overall space, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0025] Figure 1 It is a schematic diagram of the overall structure of the composite filter element of the utility model;

[0026] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0027] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure along the BB direction.

[0028] List of reference numerals:

[0029] 1. Shell; 11. Front water inlet; 111. Second gap flow channel; 12. Front water outlet; 121. Third gap flow channel; 13. Rear water inlet; 131. First gap flow channel; 132. Fourth gap flow channel; 14. Rear water outlet; 21. First cylindrical carbon core; 22. PP cotton core; 3. Second cylindrical carbon core; 31. Third end cover; 32. Fourth end cover; 4. First center tube; 5. Second center tube; 61. First end cover; 62. Cylindrical connecting shell; 63. Second end cover; 71. First sealing ring; 72. Second sealing ring; 73. Third sealing ring; 74. Fourth sealing ring; 75. Fifth sealing ring. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art 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, terms such as "upper", "lower", "inside", "outside", "top", and "bottom" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the 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. Therefore, it cannot be understood as a limitation on the present invention.

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

[0033] Based on the background technology, the problem of the filter element in the existing water purifier occupying too much space in the machine is solved. The utility model provides a composite filter element, which aims to combine the front filter element and the rear filter element into an integral filter element, so as to reduce the filter element occupying too much internal space of the machine and improve the user experience.

[0034] Specifically, Figures 1 to 3 As shown, the composite filter element of the present invention comprises a housing 1, and a two-way flow channel pipe, a pre-filter module and a post-filter module located in the housing 1.

[0035] The pre-filter module and the post-filter module are distributed along the axial direction of the housing 1. Figure 2 From the top, the pre-filter module and the post-filter module are arranged in the vertical direction, and the pre-filter module is located above the post-filter module. Figure 2 The top portion (viewed from above) is provided with a front water inlet 11, a front water outlet 12, a rear water inlet 13 and a rear water outlet 14.

[0036] like Figure 2 and Figure 3 As shown, the water inlet side of the pre-filter module is connected to the pre-water inlet 11, the water outlet side of the pre-filter module is connected to the pre-water outlet 12, and one end of the two-way flow channel pipe (from Figure 2 The bottom end when viewed from above) is connected to the post-filter module, and the other end of the two-way flow pipe (from Figure 2 The top portion when viewed from above) passes through the pre-filter module and is connected to the rear water inlet 13 and the rear water outlet 14.

[0037] Preferably, if Figure 2 and Figure 3 As shown, the bidirectional flow channel pipe includes a first central tube 4 and a second central tube 5 sleeved on the outside of the first central tube 4, and a first gap flow channel 131 is formed between the outer wall of the first central tube 4 and the inner wall of the second central tube 5, and the two ends of the first gap flow channel 131 are respectively connected to the rear water inlet 13 and the rear filter module, and the two ends of the chamber of the first central tube 4 are respectively connected to the chamber of the rear filter module and the rear water outlet 14.

[0038] The chamber of the post-filter module refers to a chamber that contains water filtered by the post-filter module. The water to be filtered enters the first gap flow channel 131 from the post-water inlet 13, enters the post-filter module along the first gap flow channel 131, and the water filtered by the post-filter module enters the chamber of the post-filter module, then enters the first central tube 4, and finally is discharged from the post-water outlet 14.

[0039] Preferably, if Figure 2 and Figure 3As shown, the pre-filter module includes a pre-filter assembly and a second end cap, and the pre-filter assembly is clamped and fixed between the first end cap 61 and the post-filter module. The pre-inlet 11 and the pre-outlet 12 are respectively connected to the water inlet side and the water outlet side of the pre-filter assembly.

[0040] Exemplarily, the first end cap 61 is located above the pre-filter assembly, and clamps the pre-filter assembly together with the post-filter module located below the pre-filter assembly.

[0041] Preferably, if Figure 2 and Figure 3 As shown, the pre-filter assembly in the composite filter element of the present invention comprises an outer PP cotton core 22 and an inner first cylindrical carbon core 21 .

[0042] Among them, the first cylindrical carbon core 21 is sleeved on the outside of the second center tube 5, and a second gap flow channel 111 is formed between the outside of the PP cotton core 22 and the inner wall of the outer shell 1. The second gap flow channel 111 is connected to the front water inlet 11 on the outer shell 1. A third gap flow channel 121 is formed between the inner wall of the first cylindrical carbon core 21 and the outer wall of the second center tube 5. The third gap flow channel 121 is connected to the front water outlet 12 on the outer shell 1.

[0043] like Figure 2 As shown, when the pre-filter assembly in the composite filter element filters and produces water, the water flows into the second gap flow channel 111 through the pre-water inlet 11, surrounds the outside of the PP cotton core 22, and under the action of water pressure, the water flows radially through the PP cotton core 22 and the first cylindrical carbon core 21 in turn to form primary filtered water. The primary filtered water gathers in the third gap flow channel 121 between the first cylindrical carbon core 21 and the second center tube 5, and finally flows to the pre-water outlet 12 on the outer shell 1 to produce water.

[0044] Preferably, if Figure 2 and Figure 3 As shown, the post-filter module of the utility model includes a shell and a post-filter assembly installed in the shell, and a fourth gap flow channel 132 is provided between the outer wall of the post-filter assembly and the inner wall of the shell, the fourth gap flow channel 132 is connected to the first gap flow channel 131, and the chamber of the post-filter assembly is connected to the chamber of the first center tube 4.

[0045] Preferably, if Figure 2 and Figure 3 As shown, the housing in the post-filter module of the present invention includes a cylindrical connecting shell 62 and a second end cap 63, and the second end cap 63 is connected to one end of the cylindrical connecting shell 62 (from Figure 2 The fourth gap flow channel 132 is located between the outer wall of the post-filter assembly and the inner wall of the cylindrical connecting shell 62.

[0046] Preferably, if Figure 2 and Figure 3 As shown, the post-filter assembly in the composite filter element of the present invention includes a second cylindrical carbon core 3 , a third end cover 31 and a fourth end cover 32 .

[0047] The third end cap 31 and the fourth end cap 32 clamp and fix the second cylindrical carbon core 3 in the cylindrical connecting shell 62. The chamber of the second cylindrical carbon core 3 is connected to the chamber of the first central tube 4, and the fourth gap flow channel 132 is located between the outer wall of the second cylindrical carbon core 3 and the inner wall of the cylindrical connecting shell 62.

[0048] More specifically, if Figure 2 and Figure 3 As shown, the upper end of the cylindrical connecting shell 62 in the utility model has a flange structure, an outer sleeve seat that docks and fixes the first center tube 4 and the second center tube 5, and an inner sleeve seat that docks and fixes the third end cover 31, and the inner sleeve seat and the outer sleeve seat are connected to each other. Among them, the chamber of the second cylindrical carbon core 3 is connected to the chamber of the first center tube 4 by means of the outer sleeve seat and the inner sleeve seat that are connected to each other at the upper end of the cylindrical connecting shell 62, and the lower end of the cylindrical connecting shell 62 is welded and sealed to the second end cover 63 to seal the second cylindrical carbon core 3, the third end cover 31 and the fourth end cover 32 in the chamber of the cylindrical connecting shell 62.

[0049] The flange structure on the cylindrical connecting shell 62 covers the lower end of the PP cotton core 22 of the pre-filter assembly to enhance the stability of the pre-filter assembly in the outer shell 1.

[0050] like Figure 3 As shown, when the post-filter assembly in the composite filter element is filtering and producing water, water flows through the post-water inlet 13 on the outer shell 1 into the first gap flow channel 131 between the first center tube 4 and the second center tube 5, and the water flows through the first gap flow channel 131 through the outer sleeve seat and the inner sleeve seat that are connected to each other into the fourth gap flow channel 132 in the cylindrical connecting shell 62 and surrounds the outer side of the second cylindrical carbon core 3. Under the action of water pressure, the water flows along the second cylindrical carbon core 3 to the inner chamber of the second cylindrical carbon core 3 to be filtered to form high-grade filtered water. The high-grade filtered water flows into the first center tube 4 through the inner sleeve seat and the outer sleeve seat that are connected to each other and flows to the post-water outlet 14 on the outer shell 1 to complete the water production.

[0051] It can be understood that the pre-filter assembly and the post-filter assembly in the composite filter element are installed in parallel in the axial direction of the shell 1 as independent structures, and the post-filter assembly can be connected with the post-water inlet 13 and the post-water outlet 14 on the shell 1 by means of a two-way flow pipe passing through the interior of the pre-filter assembly, so that the flow channel in the post-filter assembly and the flow channel in the pre-filter assembly remain independent of each other and are respectively connected with the post-water inlet and outlet and the pre-water inlet and outlet on the shell 1. The assembly structure of the composite filter element greatly reduces the space occupied by the pre-filter element and the post-filter element in the water purifier, and the composite filter element has a small number of components, convenient assembly, and low cost.

[0052] It should be noted that, although the above-mentioned two-way flow channel tube adopts a sleeve structure in which the first center tube 4 and the second center tube 5 are coaxially arranged inside and outside, the two-way flow channel tube structure of the utility model is not limited to the above-mentioned setting structure. According to actual applications, technical personnel in this field may also adopt flow channel tubes of other structures, for example, the cross-section of the flow channel tube is a two-way flow channel tube with a symmetrical structure of "sun" shape, or the cross-section of the flow channel tube is a semicircular two-way flow channel tube with a symmetrical structure, etc. Such flexible adjustment and change of the specific structure of the two-way flow channel tube does not deviate from the basic principle and scope of the utility model, and should be limited within the protection scope of the utility model.

[0053] Of course, the utility model preferably adopts a mounting structure in which the first central tube 4 and the second central tube 5 are coaxially sleeved inside and outside the bidirectional flow channel tube. This mounting structure is easy to install and is convenient for assembling and disassembling the composite filter element.

[0054] like Figure 2 and Figure 3 As shown, the composite filter element of the utility model further includes a sealing ring, wherein the sealing ring includes a first sealing ring 71 , a second sealing ring 72 , a third sealing ring 73 , a fourth sealing ring 74 , and a fifth sealing ring 75 .

[0055] like Figure 2 and Figure 3 As shown, the upper and lower ends of the first center tube 4 in the composite filter element are sleeved with two first sealing rings 71, and the upper and lower ends of the second center tube 5 are sleeved with two second sealing rings 72. The first end cap 61 has an upward mounting seat, and two third sealing rings 73 are sleeved on the circumference of the mounting seat. The inner sleeve seat inside the cylindrical connecting shell 62 is sleeved with a fourth sealing ring 74. The fourth end cap 32 covers the bottom of the second cylindrical carbon core 3, and the edge of the fourth end cap 32 is in close contact with the inner wall of the cylindrical connecting shell 62. The fifth sealing ring 75 is located between the edge of the fourth end cap 32 and the inner wall of the cylindrical connecting shell 62.

[0056] It can be understood that after the edge of the fourth end cover 32 is in close contact with the inner wall of the cylindrical connecting shell 62, the second cylindrical carbon core 3 is sealed in the chamber between the fourth end cover 32 and the cylindrical connecting shell 62, further improving the overall sealing of the shell.

[0057] It should be noted that the above-mentioned sealing members are all made of silicone or rubber.

[0058] In addition, it should be noted that the number of sealing rings in the above-mentioned composite filter element is not restrictive. Taking the first sealing ring 71 as an example, a first sealing ring 71 can be sleeved on the end of the first center tube 4, or three or more first sealing rings 71 can be sleeved on the end of the first center tube 4, and so on. According to actual applications, technical personnel in this field can flexibly adjust the number of sealing rings according to the sealing requirements of the composite filter element. Such flexible adjustment and change of the specific number of sealing rings does not deviate from the basic principle and scope of the present utility model, and should be limited within the protection scope of the present utility model.

[0059] In addition, the inventors of the present invention have found that when the first center tube 4 and the second center tube 5 in the above-mentioned composite filter element are made of injection molded tubes, the excessively thick tube walls of the first center tube 4 and the second center tube 5 affect the optimization of the overall radial size of the composite filter element to a certain extent.

[0060] Preferably, if Figure 2 and Figure 3 As shown, the first central tube 4 and / or the second central tube 5 of the composite filter element of the present invention are made of metal pipes.

[0061] It can be understood that, on the basis of ensuring the structural strength of the two-way flow channel tube, according to actual applications, technical personnel in this field can select a first center tube 4 made of a metal tube and a second center tube 5 made of an injection molded tube, or a first center tube 4 made of an injection molded tube and a second center tube 5 made of a metal tube, or a first center tube 4 made of a metal tube, and a second center tube 5 made of a metal tube, etc. The above schemes can all reduce the radial size of the two-way flow channel tube in the composite filter element. This flexible adjustment and change of the specific materials used for the first center tube 4 and the second center tube 5 does not deviate from the basic principle and scope of the present utility model, and should be limited within the protection scope of the present utility model.

[0062] The following is a specific embodiment of the utility model for a bidirectional flow channel pipe:

[0063] Embodiment 1

[0064] In this embodiment, the first central tube 4 of the bidirectional flow channel tube is made of metal pipe, the wall thickness of the first central tube 4 is 0.3 to 0.5 mm, preferably 0.4 mm, and the outer diameter of the first central tube 4 is 5 to 7 mm. The second central tube 5 is made of injection molded pipe (PVC pipe), the outer diameter of the second central tube 5 is 16 mm, and the wall thickness of the second central tube 5 is 3 mm. Correspondingly, the outer diameter of the housing 1 is 70 mm.

[0065] Embodiment 2

[0066] In this embodiment, the first central tube 4 of the bidirectional flow channel tube is made of injection-molded tubing (PVC tube), the wall thickness of the first central tube 4 is 2 mm, and the outer diameter of the first central tube 4 is 7 mm. The second central tube 5 is made of metal tubing, the wall thickness of the second central tube 5 is 0.3 to 0.5 mm, preferably 0.4 mm, and the outer diameter of the second central tube 5 is 13 mm. Accordingly, the outer diameter of the housing 1 is set to 65 mm.

[0067] Embodiment 3

[0068] In this embodiment, the first central tube 4 and the second central tube 5 of the bidirectional flow channel are both made of metal pipes. The wall thickness of the first central tube 4 is 0.4 mm, and the outer diameter of the first central tube 4 is 5 mm. The wall thickness of the second central tube 5 is 0.5 mm, and the outer diameter of the second central tube 5 is 12 mm. Accordingly, the outer diameter of the housing 1 is set to 55 mm.

[0069] It should be noted that, according to practical applications, those skilled in the art may select food-grade stainless steel tubes or copper tubes with electroplated anti-rust coatings, etc. Of course, any one of 304, 306 or 316 stainless steel tubes is preferred to reduce the preparation cost of the composite filter element.

[0070] After the composite filter element of the utility model adopts the two-way flow channel tube of the above-mentioned embodiment one, embodiment two and embodiment three, it can be expected that after at least one of the first center tube 4 and the second center tube 5 in the two-way flow channel tube adopts a metal tube, the overall radial dimension of the two-way flow channel tube can be reduced, thereby ensuring the structural strength and filtering effect of the composite filter element. The outer diameter dimension of the outer shell 1 is optimized and reduced as much as possible, so that the overall radial dimension of the composite filter element can be controlled within the range of 55mm-70mm.

[0071] Compared with the existing composite filter element with an overall diameter of more than 80 mm, the composite filter element of the utility model has a smaller radial dimension, a more compact overall structure and saves installation space.

[0072] Finally, the utility model also provides a water purifier, which includes the above-mentioned composite filter element.

[0073] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, 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 fall within the protection scope of the utility model.

Claims

1. A composite filter element, characterized in that: It comprises a housing (1) and a two-way flow channel pipe, a pre-filter module and a post-filter module located in the housing (1); The front filter module and the rear filter module are distributed along the axial direction of the housing, and the end of the housing (1) is provided with a front water inlet (11), a front water outlet (12), a rear water inlet (13) and a rear water outlet (14); The water inlet side of the pre-filter module is in communication with the pre-water inlet (11), and the water outlet side of the pre-filter module is in communication with the pre-water outlet (12). One end of the two-way flow pipe is in communication with the chamber of the post-filter module, and the other end of the two-way flow pipe passes through the pre-filter module and is in communication with the post-water inlet (13) and the post-water outlet (14).

2. The composite filter element according to claim 1, characterized in that: The bidirectional flow channel pipe comprises a first central tube (4) and a second central tube (5) sleeved on the outside of the first central tube (4); a first gap flow channel (131) is formed between the outer wall of the first central tube (4) and the inner wall of the second central tube (5); two ends of the first gap flow channel (131) are respectively connected to the rear water inlet (13) and the rear filter module; and two ends of the chamber of the first central tube (4) are respectively connected to the chamber of the rear filter module and the rear water outlet (14).

3. The composite filter element according to claim 2, characterized in that: The pre-filter module comprises a pre-filter assembly and a first end cover (61), and the pre-filter assembly is clamped and fixed between the first end cover (61) and the post-filter module.

4. The composite filter element according to claim 3, characterized in that: The pre-filter assembly comprises an outer PP cotton core (22) and an inner first cylindrical carbon core (21); the first cylindrical carbon core (21) is sleeved on the outer side of the second center tube (5); a second gap flow channel (111) is formed between the outer side of the PP cotton core (22) and the inner wall of the outer shell (1); the second gap flow channel (111) is connected to the pre-water inlet (11); a third gap flow channel (121) is formed between the inner wall of the first cylindrical carbon core (21) and the outer wall of the second center tube (5); the third gap flow channel (121) is connected to the pre-water outlet (12).

5. The composite filter element according to claim 2, characterized in that: The post-filter module comprises a shell and a post-filter assembly installed in the shell, a fourth gap flow channel (132) is provided between the outer wall of the post-filter assembly and the inner wall of the shell, the fourth gap flow channel is connected to the first gap flow channel (131), and the chamber of the post-filter assembly is connected to the chamber of the first central tube (4).

6. The composite filter element according to claim 5, characterized in that: The shell comprises a cylindrical connecting shell (62) and a second end cover (63) sealed to one end of the cylindrical connecting shell (62), and a fourth gap flow channel (132) is located between the outer wall of the post-filter assembly and the inner wall of the cylindrical connecting shell (62).

7. The composite filter element according to claim 6, characterized in that: The post-filter assembly comprises a second cylindrical carbon core (3) and a third end cap (31) and a fourth end cap (32) for clamping and fixing the second cylindrical carbon core (3); the chamber of the second cylindrical carbon core (3) is connected to the chamber of the first center tube (4); and the fourth gap flow channel (132) is located between the outer wall of the second cylindrical carbon core (3) and the inner wall of the cylindrical connecting shell (62).

8. The composite filter element according to any one of claims 2 to 7, characterized in that: The first central tube (4) and / or the second central tube (5) are metal tubes.

9. The composite filter element according to claim 8, characterized in that: The first central tube (4) is a stainless steel tube, the wall thickness of the first central tube (4) is 0.3 mm to 0.5 mm, and the outer diameter of the first central tube (4) is 5.0 mm to 7.0 mm.

10. A water purifier, characterized in that: A composite filter element comprising any one of claims 1 to 9.

Images