Composite filter element and water purification equipment

Abstract

The utility model discloses a composite filter element and water purification equipment, and relates to the technical field of water purification equipment, the composite filter element comprises a filter bottle, a first filter assembly and a second filter assembly, the bottom of the filter bottle is provided with a mounting port; the filter bottle cap is mounted at the bottle opening; the partition cylinder is arranged in the filter bottle, the partition cylinder divides the interior of the filter bottle into a first filter cavity and a second filter cavity, the first filter assembly comprises a front filter element and / or a rear filter element, and the second filter assembly comprises a reverse osmosis filter element. According to the technical scheme, the mounting opening is formed in the bottom of the filter bottle, so that the first filter assembly with the front filter element and / or the rear filter element is detachably mounted in the mounting opening, and only the first filter assembly needs to be directly dismounted when the first filter assembly is replaced; therefore, the step of detaching the whole composite filter element from the water purification device is omitted, and the replacement step of the first filter assembly is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification equipment, in particular to a composite filter element and water purification equipment. Background Art

[0002] Existing composite filter cartridges reduce the space occupied by water purification equipment by integrating the pre-filter, post-filter, and reverse osmosis filter into a single filter bottle. However, the service life of the pre-filter and post-filter cartridges is shorter than that of the reverse osmosis filter cartridge. Therefore, when replacing the composite filter cartridge, only the pre-filter and post-filter cartridges can be replaced, leaving the reverse osmosis filter cartridge untouched. However, filter replacement often requires removing the entire composite filter cartridge from the water purification equipment before replacing the pre-filter and / or post-filter cartridges. This process is cumbersome and inconvenient. Utility Model Content

[0003] The main purpose of the utility model is to provide a composite filter element and a water purification device, aiming to simplify the replacement process of the pre-filter element and / or the post-filter element in the composite filter element.

[0004] To achieve the above-mentioned purpose, the composite filter element proposed in the present invention comprises:

[0005] The filter bottle has a plurality of water inlets on the top for connecting the inside of the filter bottle with the external water channel, and a mounting port on the bottom of the filter bottle;

[0006] A separator is provided in the filter bottle, and the separator separates the filter bottle into a first filter cavity and a second filter cavity;

[0007] a first filter assembly, detachably mounted in the first filter cavity through the mounting opening, the first filter assembly comprising a pre-filter element and / or a post-filter element;

[0008] The second filter assembly is arranged in the second filter cavity, and the second filter assembly includes a reverse osmosis filter element.

[0009] In one embodiment, the first filter assembly includes a filter element pull-out cover, which is rotatably buckled on the mounting port, and the side of the filter element pull-out cover facing the first filter cavity is connected to the pre-filter element and / or the post-filter element.

[0010] In one embodiment, a hand grip groove is provided on a side of the filter element pull-out cover away from the first filter cavity.

[0011] In one embodiment, the two hand-holding grooves are spaced apart and arranged on a side of the filter element pull-out cover away from the first filter cavity, and a hand-holding portion is formed between the two hand-holding grooves.

[0012] In one embodiment, the filter element pull-out cover includes a main body and an outer cover edge, the outer cover edge abuts against the bottom of the bottle, the main body extends into the mounting port, a clamping portion is protruded from the outer periphery of the main body, and a clamping platform adapted to the clamping portion is provided on the inner wall of the mounting port.

[0013] In one embodiment, a first sealing ring is provided between the outer periphery of the main body and the inner wall of the partition.

[0014] In one embodiment, the first filter assembly includes a partition that separates the first filter cavity so that the pre-filter element and the post-filter element are respectively arranged on opposite sides of the partition, and the pre-filter element and the post-filter element are respectively connected to the partition.

[0015] In one embodiment, a second sealing ring is provided between the partition and the partition cylinder.

[0016] In one embodiment, the pre-filter element and the post-filter element are distributed up and down in the axial direction of the filter bottle, the pre-filter element is closer to the bottle mouth than the post-filter element, and the post-filter element is connected to the filter element pull-out cover.

[0017] The present utility model proposes a water purification device, which includes a composite filter element, which includes a filter bottle, a partition cylinder, a first filter component and a second filter component. The top of the filter bottle is provided with multiple water inlets for connecting the inside of the filter bottle with the external water channel, and the bottom of the filter bottle is provided with an installation port; the partition cylinder is arranged in the filter bottle, and the partition cylinder divides the inside of the filter bottle into a first filter chamber and a second filter chamber; the first filter component is detachably installed in the first filter chamber through the installation port, and the first filter component includes a pre-filter element and / or a post-filter element; the second filter component is arranged in the second filter chamber, and the second filter component includes a reverse osmosis filter element.

[0018] The technical solution of the present invention is to open a mounting port at the bottom of the filter bottle so that the first filter assembly with a pre-filter element and / or a post-filter element can be detachably mounted on the mounting port. Therefore, when replacing the first filter assembly, only the first filter assembly needs to be disassembled, thereby eliminating the step of disassembling the composite filter element from the water purification device and simplifying the replacement steps of the first filter assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the composite filter element provided by the utility model;

[0021] Figure 2 This is a structural diagram after the first filter assembly is separated from the installation port;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure in a cross-sectional view;

[0023] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 It is a structural diagram of the pull-out cover of the filter element.

[0025] Description of Figure Numbers:

[0026] 100. Composite filter element; 1. Filter bottle; 11. Top; 12. Bottom; 13. Bottle body; 121. Mounting port; 121a. Card stand; 2. Filter bottle cover; 21. Pre-filter element water inlet; 22. Pre-filter element water outlet; 23. Reverse osmosis filter element water inlet; 24. Wastewater outlet; 25. Post-filter element water outlet; 3. Septum tube; 3a. First filter chamber; 3b. Second filter chamber; 4. First filter assembly; 41. Pre-filter element; 42. Post-filter element; 43. Filter element pull-out cover; 431. Main body; 431a. Clamping portion; 431b. First accommodating groove; 432. Outer cover edge; 433. Hand-held portion; 434. Hand-grip groove; 435. Separator; 435a. Second accommodating groove; 5. Second filter assembly; 51. Reverse osmosis filter element; 61. First sealing ring; 62. Second sealing ring.

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] As the public pursues a higher quality of life, water quality has begun to attract much attention. Water purification equipment with reverse osmosis function is becoming more and more popular among the public because the purified water it produces is fresher, more hygienic and safer.

[0032] Existing composite filter cartridges reduce the space occupied by water purification equipment by integrating the pre-filter, post-filter, and reverse osmosis filter into a single filter bottle. However, the service life of the pre-filter and post-filter cartridges is shorter than that of the reverse osmosis filter cartridge. Therefore, when replacing the composite filter cartridge, only the pre-filter and post-filter cartridges can be replaced, leaving the reverse osmosis filter cartridge untouched. However, filter replacement often requires removing the entire composite filter cartridge from the water purification equipment before replacing the pre-filter and / or post-filter cartridges. This process is cumbersome and inconvenient.

[0033] In view of this, the present invention proposes a composite filter element 100 .

[0034] See also Figures 1 to 3In one embodiment of the present invention, the composite filter element 100 includes a filter bottle 1, a partition 3, a first filter component 4 and a second filter component 5. The top 11 of the filter bottle 1 is provided with multiple water inlets for connecting the inside of the filter bottle 1 with the external water channel, and the bottom 12 of the filter bottle is provided with an installation port 121; the partition 3 is arranged in the filter bottle 1, and the partition 3 divides the filter bottle 1 into a first filter chamber 3a and a second filter chamber 3b; the first filter component 4 is detachably installed in the first filter chamber 3a through the installation port 121, and the first filter component 4 includes a pre-filter element 41 and / or a post-filter element 42; the second filter component 5 is arranged in the second filter chamber 3b, and the second filter component 5 includes a reverse osmosis filter element 51.

[0035] Specifically, the filter bottle 1 is barrel-shaped and has a receiving cavity formed therein for accommodating the first filter assembly 4 and the second filter assembly 5, thereby ensuring that the first filter assembly 4 and the second filter assembly 5 are not disturbed by external factors during operation. The filter bottle includes a body 13 and a filter bottle cap 2. The body 13 has a bottle mouth, and the filter bottle cap 2 is mounted on the bottle mouth. The specific mounting method can be a threaded connection or a rotary welding method. Here, the filter bottle cap 2 and the body 13 are fixed together by rotary welding, thereby strengthening the connection between the filter bottle cap 2 and the body 13.

[0036] The filter bottle cover 2 is provided with multiple water inlets for connecting the interior of the filter bottle 1 with the external water channel. Specifically, the multiple water inlets provided on the filter bottle cover 2 are respectively the pre-filter element water inlet 21, the pre-filter element water outlet 22, the reverse osmosis filter element water inlet 23, the wastewater outlet 24 and the post-filter element water outlet 25. Among them, the raw water to be filtered flows into the filter bottle 1 from the water inlet 21 of the pre-filter element, and after being filtered by the pre-filter element 41, larger particles, impurities and flocs are filtered out, and flows out from the water outlet 22 of the pre-filter element. The outflowing water passes through the waterway plate outside the composite filter element 100 and flows into the filter bottle 1 again from the water inlet of the reverse osmosis filter element 51. After being filtered by the reverse osmosis filter element 51, the water carrying a high concentration of salt ions is discharged from the wastewater outlet 24, and the water with most of the salt ions filtered out flows to the post-filter element 42, and the taste of the filtered water is adjusted by the post-filter element 42. After being filtered by the post-filter element 42, it flows from the water outlet of the post-filter element 42 to the faucet for discharge.

[0037] The filter bottle cover 2 is provided with multiple water inlets for connecting the interior of the filter bottle 1 with the external water channel. Specifically, the multiple water inlets provided on the filter bottle cover 2 are respectively the pre-filter element water inlet 21, the pre-filter element water outlet 22, the reverse osmosis filter element water inlet 23, the wastewater outlet 24 and the post-filter element water outlet 25. Among them, the raw water to be filtered flows into the filter bottle 1 from the water inlet 21 of the pre-filter element, and after being filtered by the pre-filter element 41, larger particles, impurities and flocs are filtered out, and flows out from the water outlet 22 of the pre-filter element. The outflowing water passes through the waterway plate outside the composite filter element 100 and flows into the filter bottle 1 again from the water inlet of the reverse osmosis filter element 51. After being filtered by the reverse osmosis filter element 51, the water carrying a high concentration of salt ions is discharged from the wastewater outlet 24, and the water with most of the salt ions filtered out flows to the post-filter element 42, and the taste of the filtered water is adjusted by the post-filter element 42. After being filtered by the post-filter element 42, it flows from the water outlet of the post-filter element 42 to the faucet for users.

[0038] Furthermore, a partition 3 is provided in the filter bottle 1, which divides the filter bottle 1 into a first filter chamber 3a and a second filter chamber 3b. The first filter assembly 4 is provided in the first filter chamber 3a, and the second filter assembly 5 is provided in the second filter chamber 3b, wherein the first filter chamber 3a and the second filter chamber 3b can be separated up and down, or inside and outside. Considering that the service life of the pre-filter element 41 and the post-filter element 42 is shorter than that of the reverse osmosis filter element 51, when the service life of the pre-filter element 41 and / or the post-filter element 42 expires, only the pre-filter element 41 and / or the post-filter element 42 can be replaced without replacing the reverse osmosis filter element 51. The first filter assembly 4 can include the pre-filter element 41 and / or the post-filter element 42, that is, the first filter assembly 4 can include only the pre-filter element 41, only the post-filter element 42, or both the pre-filter element 41 and the post-filter element 42, while the second filter assembly 5 includes the reverse osmosis filter element 51. When the service life of the filter element in the first filter assembly 4 expires, the first filter assembly 4 is removed from the filter bottle 1 through the installation port 121, thereby avoiding too frequent replacement of the composite filter element 100.

[0039] It should be noted that in this embodiment, the pre-filter element 41, the reverse osmosis filter element 51, and the post-filter element 42 are integrated into the filter bottle 1, which has the advantage of saving installation space compared to arranging them separately in three filter bottles 1. In previous embodiments, the first filter assembly 4 having the pre-filter element 41 and / or the post-filter element 42 is generally disassembled from the end of the filter bottle 1 close to the filter element cover. During the disassembly process, the composite filter element 100 needs to be taken out of the water purification device, and the process of disassembling and replacing the first filter assembly 4 is relatively cumbersome. However, the composite filter element 100 proposed in the present invention only needs to disassemble the first filter assembly 4 from the installation port 121 of the bottle bottom 12, thereby eliminating the step of disassembling the composite filter element 100 from the water purification device and simplifying the disassembly process of the first filter assembly 4.

[0040] The technical solution of the present invention is to provide a mounting port 121 at the bottom 12 of the filter bottle 1, so that the first filter component 4 having the pre-filter element 41 and / or the post-filter element 42 can be detachably mounted on the mounting port 121. Therefore, when replacing the first filter component 4, it is only necessary to directly disassemble the first filter component 4, thereby eliminating the step of disassembling the composite filter element 100 from the water purification device, and simplifying the replacement steps of the first filter component 4.

[0041] In one embodiment, see Figures 1 to 5 , it is particularly important to note that Figure 2 The first filter assembly 4 includes a filter element pull-out cover 43, which is rotatably buckled on the mounting port 121, and the filter element pull-out cover 43 is connected to the pre-filter element 41 and / or the post-filter element 42 on the side facing the first filter cavity 3a.

[0042] It should be noted that the filter element pull-out cover 43 is used to remove the first filter assembly 4 from the composite filter element 100 or install it into the composite filter element 100, wherein the filter element pull-out cover 43 can be connected to the pre-filter element 41, the filter element pull-out cover 43 can be connected to the post-filter element 42, or the filter element pull-out cover 43 can be connected to both the pre-filter element 41 and the post-filter element 42. The filter element pull-out cover 43 can be connected to the pre-filter element 41 and / or the post-filter element 42 directly or indirectly, and the direct connection can be adhesive bonding. The filter element pull-out cover 43 is rotatably buckled to the mounting port 121 in order to facilitate pulling the first filter assembly 4 out of the septum 3 by applying tension to the filter element pull-out cover 43.

[0043] Further, in one embodiment, see Figure 4 and Figure 5 The filter element pull-out cover 43 includes a main body 431 and an outer cover edge 432. The outer cover edge 432 abuts against the bottle bottom 12. The main body 431 extends into the mounting port 121. The outer periphery of the main body 431 is protrudingly provided with a clamping portion 431a. The inner wall of the mounting port 121 is provided with a clamping platform 121a adapted to the clamping portion 431a.

[0044] According to the previous embodiment, the filter element pull-out cover 43 includes a main body 431 and an outer cover edge 432, wherein the outer cover edge 432 is protruding from the outer periphery of the main body 431 and is arranged on the side of the main body 431 away from the first filter cavity 3a, so that the outer cover edge 432 abuts against the bottle bottom 12, that is, the outer cover edge 432 abuts against the outer periphery of the mounting opening 121, thereby preventing the filter element pull-out cover 43 from excessively extending into the mounting opening 121 and serving as a position limiter for the installation of the filter element pull-out cover 43. During the mating process between the main body 431 and the outer cover edge 432, the main body 431 is screwed into the mounting opening 121 until the engaging portion 431a rotates deeply above the engaging platform 121a, so that the engaging portion 431a is limited by the engaging platform, thereby fixing the filter element pull-out cover 43 to the mounting opening 121 and blocking the mounting opening 121.

[0045] In one embodiment, please continue to refer to Figure 4 and Figure 5 A first sealing ring 61 is provided between the outer periphery of the main body 431 and the inner wall of the partition 3 .

[0046] Furthermore, considering that the filter element pull-out cover 43 should block the installation opening 121 so that the liquid in the first filter cavity 3a does not flow to the outside of the composite filter element 100 through the installation opening 121, a first sealing ring 61 is provided between the outer periphery of the main body 431 and the inner wall of the septum 3, so that a seal is achieved between the outer periphery of the filter element cover and the inner wall of the septum 3 via the first sealing ring 61. Specifically, a first receiving groove 431b is provided on the outer periphery of the filter element cover to better limit the position of the first sealing ring 61, so that a portion of the first sealing ring 61 is received in the first receiving groove 431b, while the other portion of the sealing ring is exposed in the first receiving groove 431b and has an interference fit with the inner wall of the septum 3.

[0047] In one embodiment, see Figure 5 A hand-grip groove 434 is provided on the side of the filter element pull-out cover 43 away from the first filter cavity 3a.

[0048] It should be noted that, considering that when the first filter assembly 4 is disassembled, a pulling force needs to be applied to the filter element pull-out cover 43 to remove the first filter assembly 4 from the filter bottle 1, a hand grip groove 434 is provided on the side of the filter element pull-out cover 43 away from the first filter cavity 3a, so that the user can insert a hand or finger into the hand grip groove 434 to apply a pulling force to the filter element pull-out cover 43 away from the filter bottle 1. The hand grip groove 434 can be in the shape of a square groove, a round groove, or a semicircular groove. In the present embodiment, the hand grip groove 434 is a recessed groove with a semicircular notch.

[0049] In one embodiment, please continue to refer to Figure 5The two hand-holding grooves 434 are spaced apart and arranged on a side of the filter element pull-out cover 43 away from the first filter cavity 3 a , and a hand-holding portion 433 is formed between the two hand-holding grooves 434 .

[0050] It should be noted that a handle 433 is provided on the side of the filter element pull-out cover 43 facing away from the first filter cavity 3a, so that the user can grasp the handle 433 and rotate the first filter assembly 4 from the mounting opening 121 to release the fastening relationship and then remove the first filter assembly 4. The handle 433 can be provided by protruding from the surface of the filter element pull-out cover 43 on the side away from the first filter cavity 3a, or it can be provided by being recessed in the surface of the filter element pull-out cover 43 on the side close to the first filter cavity 3a, or a groove can be provided around the handle 433 to facilitate gripping of the handle 433.

[0051] In one embodiment, see Figure 3 The first filter assembly 4 includes a partition 435, which separates the first filter cavity 3a so that the pre-filter element 41 and the post-filter element 42 are respectively arranged on opposite sides of the partition 435, and the pre-filter element 41 and the post-filter element 42 are respectively connected to the partition 435.

[0052] In this embodiment, when the first filter assembly 4 includes both a pre-filter element 41 and a post-filter element 42, the first filter assembly 4 includes a separator 435, wherein the separator 435 is connected to the pre-filter element 41 and the post-filter element 42, respectively. The separator 435 is used to separate the first filter chamber 3a into a chamber for filtration by the pre-filter element 41 and a chamber for filtration by the post-filter element 42, so that the pre-filter element 41 and the post-filter element 42 do not interfere with each other during the filtration process, thereby preventing the raw water in the filtration chamber of the pre-filter element 41 from contaminating the pure water in the filtration chamber of the post-filter element 42. The separator 435 is specifically connected to the pre-filter element 41 and the post-filter element 42 by gluing. This ensures that the pre-filter element 41 and the post-filter element 42 maintain a certain shape after being squeezed by water, preventing them from being deformed by water pressure or squeezing. The specific structure of the partition 435 is a partition, and the outer periphery of the partition or the part close to the outer periphery of the partition extends toward the opposite sides of the partition, thereby wrapping part of the outer periphery of the pre-filter element 41 and the post-filter element 42, thereby providing better support for the pre-filter element 41 and the post-filter element 42.

[0053] Further, in one embodiment, see Figure 4 A second sealing ring 62 is provided between the partition 435 and the partition tube 3.

[0054] According to the above embodiment, in order to enable the partition 435 to better separate the filter chamber of the pre-filter element 41 from the filter chamber of the post-filter element 42, a second sealing ring 62 is provided between the partition 435 and the separator 3. The second sealing ring 62 seals the upper and lower sides of the partition 435. Specifically, a second receiving groove 435a is provided on the outer periphery of the partition 435 to better limit the position of the second sealing ring 62, so that a portion of the second sealing ring 62 is received in the second receiving groove 435a, while the other portion of the second sealing ring 62 is exposed from the notch of the second receiving groove 435a and has an interference fit with the inner wall of the separator 3.

[0055] In one embodiment, see Figure 3 The pre-filter element 41 and the post-filter element 42 are distributed up and down in the axial direction of the filter bottle 1. The pre-filter element 41 is closer to the bottle mouth 11 than the post-filter element 42. The post-filter element 42 is connected to the filter element pull-out cover 43.

[0056] It should be noted that in this embodiment, the pre-filter element 41 and the post-filter element 42 are distributed vertically in the axial direction of the filter bottle 1. This allows the composite filter element 100 to occupy a smaller axial space as a whole, which is conducive to the miniaturization of the composite filter element 100. Of course, the pre-filter element 41 and the post-filter element 42 can also be distributed inside and outside the filter bottle 1. Considering that the water inlet of the reverse osmosis filter element 51 is located at the upper end of the filter bottle cover 2, the water entering the reverse osmosis filter element 51 is preferably axially traveled a longer distance before flowing through the filter chamber of the post-filter element 42 for filtration. Therefore, the pre-filter element 41 is disposed above the post-filter element 42.

[0057] The present invention also provides a water purifier, comprising a composite filter element 100. The specific structure of the composite filter element 100 is described with reference to the above-described embodiments. Since the present water purifier utilizes all of the technical solutions of all of the above-described embodiments, it at least possesses all of the beneficial effects brought about by the technical solutions of the above-described embodiments, which will not be described in detail here. The water purifier can be any of a water purifier, a water purifier, a combined water purifier, a combined water purifier and heat purifier, and an ice maker.

[0058] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A composite filter element, characterized in that: include: The filter bottle has a plurality of water inlets on the top for connecting the interior of the filter bottle with the external water channel, and a mounting port on the bottom of the filter bottle; A separator is provided in the filter bottle, and the separator separates the filter bottle into a first filter cavity and a second filter cavity; a first filter assembly, detachably mounted in the first filter cavity through the mounting opening, the first filter assembly comprising a pre-filter element and / or a post-filter element; The second filter assembly is arranged in the second filter cavity, and the second filter assembly includes a reverse osmosis filter element.

2. The composite filter element according to claim 1, characterized in that: The first filter assembly includes a filter element pull-out cover, which is rotatably buckled on the installation port, and the side of the filter element pull-out cover facing the first filter cavity is connected to the pre-filter element and / or the post-filter element.

3. The composite filter element according to claim 2, characterized in that: A hand grip groove is provided on a side of the filter element pull-out cover away from the first filter cavity.

4. The composite filter element according to claim 3, characterized in that: The two hand-holding grooves are arranged at intervals on a side of the filter element pull-out cover away from the first filter cavity, and a hand-holding portion is formed between the two hand-holding grooves.

5. The composite filter element according to claim 2, wherein: The filter element pull-out cover includes a main body and an outer cover edge, the outer cover edge abuts against the bottom of the filter bottle, the main body extends into the installation port, the outer periphery of the main body is protrudingly provided with a clamping portion, and the inner wall of the installation port is provided with a clamping platform adapted to the clamping portion.

6. The composite filter element according to claim 5, characterized in that: A first sealing ring is provided between the outer periphery of the main body and the inner wall of the partition tube.

7. The composite filter element according to claim 2, wherein: The first filter assembly further includes a partition that separates the first filter cavity so that the pre-filter element and the post-filter element are respectively disposed on opposite sides of the partition, and the pre-filter element and the post-filter element are respectively connected to the partition.

8. The composite filter element according to claim 7, wherein: A second sealing ring is provided between the partition and the partition cylinder.

9. The composite filter element according to claim 7, wherein: The pre-filter element and the post-filter element are distributed up and down in the axial direction of the filter bottle. The pre-filter element is closer to the bottle mouth than the post-filter element. The post-filter element is connected to the filter element pull-out cover.

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

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