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 filter bottle cover, a filter element cover and a filter element handle, the filter bottle cover is provided with a mounting port; the filter element cover is detachably mounted in the mounting opening, and sliding grooves are formed in the two opposite sides of the filter element cover; a mounting shaft is arranged on the connecting part of the filter element lifting handle towards the interior of the sliding chute, and the mounting shaft is arranged in the sliding chute in a sliding manner; according to the technical scheme, the sliding groove is formed in the filter element cover so that the installation shaft of the filter element handle can slide in the sliding groove, the sliding groove is provided with the first end and the second end, when the filter element handle is located at the first end, the filter element handle is limited by the limiting groove in the vertical direction, and when the filter element handle is located at the second end, the installation shaft of the filter element handle can slide in the sliding groove. The filter element lifting handle is limited in the sliding direction of the filter element lifting handle, so that the filter element lifting handle can smoothly rotate relative to the filter element cover at the second end part, and the front filter element and / or the filter element can be conveniently detached from the composite filter element.

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 integrate the pre-filter, post-filter, and reverse osmosis filter into a single filter bottle to reduce the space occupied by water purification equipment. 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, without replacing the reverse osmosis filter cartridge, thus reducing the cost of filter replacement.

[0003] Currently, a filter cartridge cover is provided to connect the pre-filter and / or post-filter, and a handle is provided on the filter cartridge cover so that the pre-filter and post-filter can be lifted out by pulling the handle. The filter cartridge handle is retracted relative to the filter cartridge cover when not in use to prevent the filter cartridge handle from shaking and generating noise. Therefore, the handle is limited in the vertical direction. In order to rotate the handle relative to the filter cartridge cover, it must first slide out of the limited space before rotating. If it is not completely moved out of the limited space, the handle cannot be rotated relative to the filter cartridge cover. Utility Model Content

[0004] The main purpose of the utility model is to provide a composite filter element and water purification equipment, aiming to facilitate the replacement of the pre-filter element and the post-filter element.

[0005] To achieve the above-mentioned purpose, the composite filter element proposed in the present invention comprises:

[0006] filter bottles;

[0007] A filter bottle cover is installed on the filter bottle, and the filter bottle cover is provided with a mounting port;

[0008] A filter element cover is detachably mounted in the mounting opening, and sliding grooves are provided on opposite sides of the filter element cover;

[0009] A filter element handle, comprising a handle portion and connecting portions connected to both ends of the handle portion, wherein the connecting portion is provided with a mounting shaft facing into the chute, and the mounting shaft is slidably disposed in the chute, wherein the chute has a first end portion and a second end portion opposite to each other;

[0010] In which, the filter bottle cover is provided with a limiting groove for the connecting part to slide in and out. When the installation shaft is located at the first end, the limiting groove limits the connecting part in the up and down directions. When the installation shaft is located at the second end, the connecting part slides out of the limiting range of the limiting groove. The filter element handle can be rotated relative to the filter element cover, and the installation shaft is located at the second end in the sliding direction of the installation shaft.

[0011] In one embodiment, a limiting portion is provided on the inner wall of the sliding groove, and the limiting portion protrudes from the inner wall of the limiting groove.

[0012] In one embodiment, the distance from the limiting portion to the first end portion is greater than the distance from the limiting portion to the second end portion.

[0013] In one embodiment, the limiting portion includes a protruding section and guide sections connected to opposite sides of the protruding section.

[0014] In one embodiment, there is a smooth transition between the guiding section and the protruding section.

[0015] In one embodiment, the outer surface of the guide section is configured as an arc surface.

[0016] In one embodiment, the distance between the two protruding sections is set to D, the radial length of the mounting shaft is set to L, and D and L satisfy the relationship: D<L.

[0017] In one embodiment, the sliding groove has a first groove wall and a second groove wall opposite to each other, and the first groove wall and the second groove wall are both protrudingly provided with the corresponding limiting portion.

[0018] In one embodiment, a through slot is provided in the middle of the installation shaft to form a deformable space.

[0019] 20. The filter bag as claimed in claim 19, wherein the filter bag is a container which has been fixed to the filter bag and has a first end portion for conveying the filter bag to the filter bag. The container is then fixed to the filter bag with a container which has a first end portion for conveying the filter bag to the filter bag. The container is then fixed to the filter bag with a container which has a first end portion for conveying the filter bag to the filter bag. The container is then fixed to the filter bag with a container which has a first end portion for conveying the filter bag to the filter bag.

[0020] The technical solution of the present utility model adopts a sliding groove provided in the filter element cover for the installation shaft of the filter element handle to slide in the sliding groove, the sliding groove having a first end and a second end. When the filter element handle is located at the first end, the filter element handle is limited in the upper and lower directions by the limiting groove. When the filter element handle is located at the second end, the filter element handle is limited in its sliding direction, so that the filter element handle can be smoothly rotated relative to the filter element cover when it is at the second end, thereby facilitating the removal of the pre-filter element and / or the filter element from the composite filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 This is a structural diagram of an embodiment of a composite filter element provided by the present utility model;

[0023] Figure 2 This is a structural diagram of the filter element cover and inner barrel being separated from the filter bottle;

[0024] Figure 3 A schematic diagram of a partial structure of the composite filter element provided by the present invention in a cross-sectional view;

[0025] Figure 4 This is a partial structural diagram of the composite filter element when the filter element handle is located at the second end;

[0026] Figure 5 for Figure 1 Schematic diagram of the structure of the filter element handle separated from the filter element cover;

[0027] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0028] Figure 7 for Figure 5 Enlarged view of point B in the middle.

[0029] Description of Figure Numbers:

[0030] 100. Composite filter element; 1. Filter bottle; 2. Filter bottle cover; 21. Mounting port; 22. Limiting groove; 3. Filter element cover; 31. Slide groove; 311. First end portion; 312. Second end portion; 313. Inner wall; 314. Limiting portion; 314a. Protruding section; 314b. Guide section; 315. First groove wall; 316. Second groove wall; 4. Filter element handle; 41. Handle portion; 42. Connecting portion; 421. Mounting shaft; 421a. Through groove; 5. Inner barrel.

[0031] 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

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Existing composite filter cartridges integrate the pre-filter, post-filter, and reverse osmosis filter into a single filter bottle to reduce the space occupied by water purification equipment. 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, without replacing the reverse osmosis filter cartridge, thus reducing the cost of filter replacement.

[0036] Currently, a filter cartridge cover is provided to connect the pre-filter and / or post-filter, and a handle is provided on the filter cartridge cover so that the pre-filter and post-filter can be lifted out by pulling the handle. The filter cartridge handle is retracted relative to the filter cartridge cover when not in use to prevent the filter cartridge handle from shaking and generating noise. Therefore, the handle is limited in the vertical direction. In order to rotate the handle relative to the filter cartridge cover, it must first slide out of the limited space before rotating. If it is not completely moved out of the limited space, the handle cannot be rotated relative to the filter cartridge cover.

[0037] The present invention provides a composite filter element 100, which is intended to facilitate the replacement of a pre-filter element and a post-filter element.

[0038] See also Figures 1 to 6 In one embodiment of the present invention, the composite filter element 100 includes a filter bottle 1, a filter bottle cover 2, a filter element cover 3 and a filter element handle 4. The filter bottle cover 2 is installed on the filter bottle 1, and the filter bottle cover 2 is provided with a mounting port 21; the filter element cover 3 is detachably installed in the mounting port 21, and the filter element cover 3 is provided with a slide groove 31 on opposite sides; the filter element handle 4 includes a handle portion 41 and a connecting portion 42 connected to both ends of the handle portion 41, and the connecting portion 42 is provided with a mounting shaft 421 facing the slide groove 31, and the mounting shaft 421 is slidably provided in the slide groove 31, and the slide groove 3 1 has a first end portion 311 and a second end portion 312 opposite to each other; wherein, the filter bottle cover 2 is provided with a limiting groove 22 for the connecting portion 42 to slide in and out; when the mounting shaft 421 is located at the first end portion 311, the limiting groove 22 limits the connecting portion 42 in the upper and lower directions; when the mounting shaft 421 is located at the second end portion 312, the connecting portion 42 slides out of the limiting range of the limiting groove 22, the filter element handle 4 can rotate relative to the filter element cover 3, and the mounting shaft 421 is located at the second end portion 312 at the upper limit of the sliding direction of the mounting shaft 421.

[0039] The composite filter element 100 is characterized by integrating a pre-filter element, a post-filter element, and a reverse osmosis filter element in the same filter bottle 1, thereby realizing an integrated composite filter element 100. The pre-filter element is used to perform preliminary filtration on raw water (tap water), filtering out larger particles of impurities and flocs therein in the pre-filter element. The water filtered by the pre-filter element flows out of the composite filter element 100 and flows into an external waterway plate. The water is then pressurized by a water pump through the flow path of the waterway plate and flows into the reverse osmosis filter element for secondary filtration. The reverse osmosis filter element isolates higher concentrations of salt ion solutes within the reverse osmosis filter element, thereby allowing water with lower salt ion solute concentrations to flow to the post-filter element for filtration. The post-filter element sterilizes and adjusts the taste of the filtered water before it flows out of the tap for drinking by the user.

[0040] Specifically, the filter bottle 1 is used to be installed in a water purification device. The filter bottle 1 is arranged in a barrel shape, so the filter bottle 1 has a accommodating cavity. The pre-filter element, the post-filter element and the reverse osmosis filter element are installed in the accommodating cavity of the filter bottle 1. The filter bottle cover 2 is arranged on the opening of the filter bottle 1, and the filter bottle cover 2 has an installation port 21, which is connected to the accommodating cavity of the filter bottle 1.

[0041] Furthermore, after the filter element is installed in the filter bottle 1, a filter element cover 3 is installed on the opening. The filter element cover 3 is provided with a handle, and the filter bottle 1 can be lifted out of the water purification device by the handle. In order to facilitate the replacement of the pre-filter element and the post-filter element with a shorter service life without replacing the reverse osmosis filter element, a filter element cover 3 is provided and connected to the pre-filter element or the post-filter element. The pre-filter element and the post-filter element can be lifted out through the filter element cover 3, thereby realizing the replacement of the pre-filter element and the post-filter element.

[0042] Considering that, in order to facilitate the removal of the pre-filter and post-filter from the filter bottle 1 through the filter cover 3, a filter handle 4 is provided, which can be used to bear force, thereby facilitating removal. Considering that, when the composite filter element 100 is in the water purification mode, the filter element will be subjected to a large water pressure, the bottle body will shake, which will drive the filter handle 4 to shake together, and generate more obvious noise. Therefore, a slide groove 31 is provided on the opposite sides of the filter cover 3, so that the filter handle 4 can slide into the limit groove 22 provided in the filter bottle cover 2 in the water purification mode, so that the limit groove 22 limits the filter handle 4 in the upper and lower directions, thereby avoiding the noise generated by the shaking of the filter handle 4. The filter cover 3 is also limited by limiting the filter handle 4, so that the filter cover 3 will not float upward due to water pressure.

[0043] When the filter cartridge handle 4 is needed, it is necessary to pull out the filter cartridge handle 4 and rotate the filter cartridge handle 4 relative to the filter cartridge cover 3, so that the operator can easily apply an outward pulling force to the filter cartridge cover 3 through the filter cartridge handle 4 to pull out the pre-filter and post-filter connected to the filter cartridge cover 3. It is taken into account that when the filter cartridge handle 4 is not completely separated from the limiting groove 22, the filter bottle cover 2 limits the connection portion 42 of the filter cartridge handle 4 in the vertical direction, so that the filter cartridge handle 4 cannot be rotated relative to the filter cartridge cover 3.

[0044] For this reason, the slide groove 31 in this embodiment is configured in a strip shape, so the first end 311 and the second end 312, which are arranged opposite each other, serve as the opposite ends of the slide groove 31. When the installation shaft 421 is located at the first end 311, the slide groove 31 is restrained within the restraining groove 22. When the installation shaft 421 is located at the second end 312, the slide groove 31 slides out of the restraining groove 22, and the installation shaft 421 rotates, allowing the filter cartridge handle 4 to rotate relative to the filter cartridge cover 3. It should be noted that, considering that during rotation, the installation shaft 421 may easily shift in the sliding direction of the installation shaft 421, causing the filter cartridge handle 4 to be restrained by the restraining groove 22 again, resulting in the filter cartridge handle 4 being unable to rotate relative to the filter cartridge cover 3. Therefore, in this embodiment, when the installation shaft 421 is located at the second end 312, the installation shaft 421 is restrained in its sliding direction, thereby allowing the installation shaft 421 to rotate smoothly. The specific method of limiting the installation shaft 421 at the second end 312 is to make the installation shaft 421 into a magnetic material, place a magnetic part at the second end 312 to adsorb the second rotating shaft; or a marble is provided on the installation shaft 421 and a through groove 421a is provided on the second end 312, and when the installation shaft 421 slides to the second end 312, the marble is limited in the second end 312; of course, a limiting protrusion can also be provided between the first end 311 and the second end 312 to limit the installation shaft 421.

[0045] The technical solution of the present invention is to provide a slide groove 31 in the filter element cover 3 for the installation shaft 421 of the filter element handle 4 to slide in the slide groove 31. The slide groove 31 has a first end 311 and a second end 312. When the filter element handle 4 is located at the first end 311, the filter element handle 4 is limited in the upper and lower directions by the limiting groove 22. When the filter element handle 4 is located at the second end 312, the filter element handle 4 is limited in its sliding direction, so that the filter element handle 4 can be smoothly rotated relative to the filter element cover 3 when it is at the second end 312, thereby facilitating the removal of the pre-filter and / or filter element from the composite filter element 100.

[0046] Preferably, see Figure 6 The inner wall 313 of the sliding groove 31 is provided with a limiting portion 314 , and the limiting portion 314 protrudes from the inner wall 313 of the limiting groove 22 .

[0047] It should be noted that, according to the above embodiment, the inner wall 313 of the chute 31 is provided with a limiting portion 314, and this limiting portion 314 is located between the first end 311 and the second end 312. After the installation shaft 421 moves from the first end 311 to the second end 312, the installation shaft 421 is limited by the protruding limiting portion 314, making it difficult for it to move from the second end 312 to the first end 311 again during the rotation process. Therefore, when the filter element handle 4 is at the second end 312, it can be smoothly rotated relative to the filter element cover 3, thereby facilitating the replacement of the pre-filter element and the post-filter element. The installation shaft 421 has a certain degree of deformation ability, and the installation shaft 421 can be set to an elastic material, or a deformation space can be formed within the installation shaft 421, which is not specifically limited here.

[0048] In one embodiment, please continue to refer to Figure 6 , the distance from the limiting portion 314 to the first end portion 311 is greater than the distance from the limiting portion 314 to the second end portion 312 .

[0049] Specifically, in order to make the limiting groove 22 have a better limiting effect on the connecting part 42 in the up and down directions, the length of the limiting groove 22 is set to be longer, so the installation shaft 421 has a certain sliding distance from the first end 311 to the limiting part 314. In order to prevent the installation shaft 421 from continuing to slide after sliding past the limiting part 314, the distance from the limiting part 314 to the second end 312 is made smaller, equal to the radial length of the installation shaft 421 or less than the radial length of the installation shaft 421, so that the installation shaft 421 has a better limiting effect at the second end 312.

[0050] In one embodiment, please continue to refer to Figure 6 The limiting portion 314 includes a protruding section 314a and guiding sections 314b connected to opposite sides of the protruding section 314a.

[0051] It should be noted that the protruding limiting portion 314 is formed by multiple parts. Among them, in order to prevent it from moving again from the second end 312 to the first end 311, the protruding section 314a is mainly used to limit the installation shaft 421. Secondly, considering that the installation shaft 421 can pass through the limiting portion 314 more smoothly, so as not to generate strong friction loss between the limiting portion 314 and the installation shaft 421, guide sections 314b are provided on both sides of the protruding section 314a. The two guide sections 314b are respectively extended from the inner wall 313 of the slide groove 31 to the side of the protruding section 314a away from the inner wall 313 of the slide groove 31.

[0052] In one embodiment, please continue to refer to Figure 6 , there is a smooth transition between the guiding section 314b and the protruding section 314a.

[0053] Furthermore, according to the above-mentioned embodiment, a smooth transition is made between the guide section 314b and the protruding section 314a. Here, the smooth transition between the guide section 314b and the protruding section 314a near the first end 311 further reduces the friction loss generated when the installation shaft 421 slides through the limit portion 314; and the smooth transition between the guide section 314b and the protruding section 314a near the second end 312 makes the installation shaft 421 rotate more smoothly when the second end 312 is rotated, so that the installation shaft 421 does not generate friction loss during the rotation process.

[0054] In one embodiment, please continue to refer to Figure 6 The outer surface of the guide section 314b is arranged in an arc shape.

[0055] Specifically, the mounting shaft 421 is configured as a circular shaft, and the outer surface of the guide section 314b is configured as an arc surface, so that the mounting shaft 421 can adapt to the outer surface of the guide section 314b during sliding and rotation, so that the mounting shaft 421 generates less resistance when sliding through and rotating the guide section 314b, thereby avoiding excessive friction and loss.

[0056] In one embodiment, please continue to refer to Figure 6 The sliding groove 31 has a first groove wall 315 and a second groove wall 316 opposite to each other, and the first groove wall 315 and the second groove wall 316 are both protrudingly provided with the corresponding limiting portion 314.

[0057] It should be noted that the installation shaft 421 has a sliding direction in the slide groove 31, and the slide groove 31 should have a first groove wall 315 and a second groove wall 316 extending along the sliding direction of the slide groove 31. In the above embodiment, the limiting portion 314 can be protrudingly provided on the first groove wall 315, or the limiting portion 314 can be provided on the second groove wall 316. In this embodiment, the limiting portion 314 is provided on both the first groove wall 315 and the second groove wall 316. The installation shaft 421 is limited by the two relatively arranged limiting portions 314, so that the limiting effect of the installation shaft 421 is better, making it difficult for the installation shaft 421 to separate from the second end portion 312 to the first end portion 311 when the second end portion 312 rotates, so as to facilitate the replacement of the pre-filter element and / or the post-filter element.

[0058] In one embodiment, see Figure 3 、 Figure 6 and Figure 7 The distance between the two protruding sections 314a is set to D, the radial length of the mounting shaft 421 is set to L, and D and L satisfy the relationship: D<L.

[0059] It should be noted that, considering that the radial length of the installation shaft 421 is greater than the distance between the two protruding sections 314a, the two protruding sections 314a can better limit the installation shaft 421, and the reason why the installation shaft 421 can slide through between the two limiting parts 314 can be due to the elastic extrusion of the installation shaft 421, the extrusion of the two protruding parts, or the elastic deformation of the extrusion itself, which is not specifically limited here.

[0060] Preferably, see Figure 3 、 Figure 5 and Figure 7 A through slot 421a is provided in the middle of the mounting shaft 421 to form a deformable space.

[0061] Considering that both the filter element cover 3 and the filter element handle 4 are made of plastic in this embodiment, the filter element handle 4 is integrally formed within the membrane, which has advantages such as simple processing and low production cost. If the installation shaft 421 were to be made of plastic, additional costs would be incurred, as would the connection between the installation shaft 421 and the connecting portion 42 of the filter element handle 4. Therefore, a through-slot 421a is defined in the middle portion of the installation shaft 421. The through-slot 421a herein refers to a slot extending radially through the installation shaft 421, dividing the installation shaft 421 into two separated portions, thereby forming a deformable space between the two portions. This allows the two portions of the installation shaft 421 to deform toward the through-slot 421a when subjected to pressure.

[0062] In another embodiment, see Figure 2 The composite filter element 100 includes an inner barrel 5, to which the filter element cover 3 is connected. The inner barrel 5 is installed within the receiving cavity of the filter bottle 1 through the mounting opening 21. The inner barrel 5 is used to accommodate the pre-filter element and / or the post-filter element. When the filter element handle 4 is pulled to remove the filter element cover 3, the inner barrel 5 is removed together with the filter element cover 3.

[0063] It should be noted that in this embodiment, the inner barrel 5 and the filter element cover 3 can be welded together or integrally formed by melting, which is not specifically limited here. A pre-filter element can be housed in the inner barrel 5, allowing it to be removed by pulling on the filter element handle 4. Alternatively, a post-filter element can be housed in the inner barrel 5, or both a pre-filter element and a post-filter element can be housed in the inner barrel 5. The provision of the inner barrel 5 ensures that after the pre-filter element is removed, filtered impurities will not remain within the filter bottle 1, making replacement of the pre-filter element more convenient.

[0064] 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.

[0065] 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: filter bottles; A filter bottle cover is installed on the filter bottle, and the filter bottle cover is provided with a mounting port; A filter element cover is detachably mounted in the mounting opening, and sliding grooves are provided on opposite sides of the filter element cover; A filter element handle, comprising a handle portion and connecting portions connected to both ends of the handle portion, wherein the connecting portion is provided with a mounting shaft facing into the chute, and the mounting shaft is slidably disposed in the chute, wherein the chute has a first end portion and a second end portion opposite to each other; In which, the filter bottle cover is provided with a limiting groove for the connecting part to slide in and out. When the installation shaft is located at the first end, the limiting groove limits the connecting part in the up and down directions. When the installation shaft is located at the second end, the connecting part slides out of the limiting range of the limiting groove. The filter element handle can be rotated relative to the filter element cover, and the installation shaft is located at the second end in the sliding direction of the installation shaft.

2. The composite filter element according to claim 1, characterized in that: The inner wall of the sliding groove is provided with a limiting portion, and the limiting portion protrudes from the inner wall of the limiting groove.

3. The composite filter element according to claim 2, characterized in that: The distance from the limiting portion to the first end portion is greater than the distance from the limiting portion to the second end portion.

4. The composite filter element according to claim 2, wherein: The limiting portion includes a protruding section and guide sections connected to opposite sides of the protruding section.

5. The composite filter element according to claim 4, characterized in that: There is a smooth transition between the guiding section and the protruding section.

6. The composite filter element according to claim 5, characterized in that: The outer surface of the guide section is arranged in an arc shape.

7. The composite filter element according to claim 4, characterized in that: The distance between the two protruding sections is set to D, the radial length of the mounting shaft is set to L, and D and L satisfy the relationship: D<L.

8. The composite filter element according to claim 2, wherein: The sliding groove has a first groove wall and a second groove wall opposite to each other, and the first groove wall and the second groove wall are both protrudingly provided with the corresponding limiting parts.

9. The composite filter element according to claim 1, wherein: A through slot is provided in the middle of the installation shaft to form a deformable space.

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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