Filter element structure and water purification device

Abstract

The utility model discloses a filter element structure and a water purification device. The filter element structure includes a housing, a pre-filter element and a reverse osmosis filter assembly; the pre-filter element is arranged in the housing and is used to filter raw water; the reverse osmosis filter assembly is arranged in the housing and arranged along the axial direction of the housing with the pre-filter element, and the reverse osmosis filter assembly is used to filter the water flow filtered by the pre-filter element. The filter element structure provided by the utility model has high integration, simple manufacturing process, small overall size, more reasonable layout of various components of the purification device, and is conducive to the miniaturization of the purification device.

Description

Technical Field

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

[0002] With the improvement of living standards, people have higher and higher requirements for the quality of drinking water. Water purification devices are becoming more and more popular by filtering tap water to improve water quality. The volume, filtering effect and cost of water purifiers are important factors to measure their market competitiveness. In related technologies, in order to improve the filtering effect, multiple filter elements are usually set in the water purification device, which makes the volume of the entire filter element structure too large, and then leads to the volume of the water purification device being too large. Utility Model Content

[0003] The first purpose of the utility model is to provide a filter element structure, which aims to solve the technical problem that the existing filter element structure has a large volume, resulting in a large volume of the purification device.

[0004] In order to achieve the above object, the utility model provides a solution: a filter element structure, comprising:

[0005] shell;

[0006] A pre-filter element, the pre-filter element is arranged in the housing and is used to filter raw water;

[0007] A reverse osmosis filtration component is disposed in the housing and arranged along the axial direction of the housing with the pre-filter element. The reverse osmosis filtration component is used to filter the water flow filtered by the pre-filter element.

[0008] As an embodiment, the housing is provided with a first water inlet, a second water inlet, a first water outlet, a second water outlet and a third water outlet;

[0009] The first water inlet and the first water outlet are both connected to the pre-filter element, the first water inlet is used for raw water to flow into the pre-filter element, and the first water outlet is used for water filtered by the pre-filter element to flow out of the housing;

[0010] The second water inlet, the second water outlet and the third water outlet are all connected to the reverse osmosis filtration component. The second water inlet is used to allow the water filtered by the pre-filter to flow into the reverse osmosis filtration component. The second water outlet is used to allow the waste water generated by filtration by the reverse osmosis filtration component to flow out of the shell. The third water outlet is used to allow the pure water generated by filtration by the reverse osmosis filtration component to flow out of the shell.

[0011] As an implementation manner, the first water inlet, the second water inlet, the first water outlet, the second water outlet and the third water outlet are opened at the same end of the outer shell along the axial direction of the outer shell.

[0012] As an embodiment, the pre-filter element is disposed at one end of the reverse osmosis filtration component close to the first water inlet.

[0013] As an embodiment, the reverse osmosis filtration component includes a reverse osmosis filter element and a post-filter element, the reverse osmosis filter element is used to filter the water flow filtered by the pre-filter element, the post-filter element is used to filter the water flow filtered by the reverse osmosis filter element, the second water inlet and the second water outlet are both connected to the reverse osmosis filter element, and the third water outlet is connected to the post-filter element; or,

[0014] The reverse osmosis filtration component comprises a reverse osmosis filter element, and the reverse osmosis filter element is used to filter the water flow filtered by the pre-filter element. The second water inlet, the second water outlet and the third water outlet are all connected to the reverse osmosis filter element.

[0015] As an embodiment, the reverse osmosis filtration component includes a reverse osmosis filter element and a post-filter element;

[0016] The reverse osmosis filter element is circumferentially arranged around the post-filter element.

[0017] As an embodiment, the reverse osmosis filter element includes a reverse osmosis membrane and a one-way valve;

[0018] The reverse osmosis membrane includes an inlet side, a pure water side and a wastewater side. The one-way valve is arranged between the inlet side and the second water inlet. The wastewater side is connected to the second water outlet, and the pure water side is connected to the third water outlet.

[0019] As an embodiment, the reverse osmosis filter element further includes a first end cap, the first end cap is connected to the water inlet side, and is enclosed with the water inlet side to form a first flow channel;

[0020] The first end cover is provided with a water inlet hole connected to the first flow channel, and the water inlet hole is used to guide the water flow filtered by the pre-filter element to the first flow channel;

[0021] The one-way valve is arranged on the first end cover and is used to open or close the water inlet hole.

[0022] As an implementation mode, the pre-filter element comprises a pre-shell and a pre-filter body;

[0023] The front shell is penetrated by a front pipe and a front cavity circumferentially arranged around the front pipe. The front pipe is used to guide the water flow generated by filtration of the reverse osmosis filtration component. The front filter body is accommodated in the front cavity and is located on the water path formed by the first water inlet and the first water outlet.

[0024] The second object of the present utility model is to provide a water purification device, comprising the above-mentioned filter element structure.

[0025] The filter element structure and water purification device provided by the utility model can perform pre-filtration and reverse osmosis filtration on raw water by arranging a pre-filter element and a reverse osmosis filtration component, thereby performing at least two filtrations on the raw water, effectively improving the filtration effect and greatly improving the water quality; the pre-filter element and the reverse osmosis filtration component are both arranged in the outer shell, that is, the pre-filter element and the reverse osmosis filtration component are integrated, which improves the integration degree and greatly reduces the volume of the filter element structure compared with the technical solution of separately arranging multiple filter elements, and is conducive to the miniaturization development of the water purification device; in addition, the pre-filter element and the reverse osmosis filtration component are both arranged in the outer shell, so that the filter element structure is integrated, and the process is simpler than the segmented welding method in the related technology, and the processing efficiency is effectively improved; by arranging the pre-filter element and the reverse osmosis filtration component along the axial direction of the outer shell, the radial size of the outer shell is reduced, which is conducive to the transverse arrangement of the filter element structure in the purification device, so that the layout of each component of the purification device is more reasonable, which is conducive to the miniaturization development of the purification device. Therefore, the filter element structure provided by the utility model has high integration, simple manufacturing process, small overall volume, and makes the layout of various components of the purification device more reasonable, which is conducive to the miniaturization of the purification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of a filter element structure provided by an embodiment of the utility model from one perspective;

[0028] Figure 2 It is a front view of the filter element structure provided by an embodiment of the utility model;

[0029] Figure 3 It is a bottom view of the filter element structure provided by the embodiment of the utility model;

[0030] Figure 4 yes Figure 3Sectional view along line AA;

[0031] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0032] Figure 6 yes Figure 4 A partial enlarged view of point C in the middle;

[0033] Figure 7 It is a top view of the housing provided by an embodiment of the utility model without the second cover.

[0034] Description of Figure Numbers:

[0035] 100, filter element structure; 10, housing; 11, first water inlet; 12, second water inlet; 13, first water outlet; 14, second water outlet; 15, third water outlet; 16, housing body; 17, first cover body; 171, groove; 18, second cover body; 20, pre-filter element; 21, pre-housing; 211, pre-pipe; 212, pre-cavity; 22, pre-filter body; 221, P P cotton layer; 222, first activated carbon layer; 23, separator tube; 30, reverse osmosis filtration assembly; 31, reverse osmosis filter element; 311, reverse osmosis membrane; 3111, water inlet side; 3112, pure water side; 3113, wastewater side; 312, one-way valve; 313, first end cover; 314, first flow channel; 315, water inlet hole; 32, post filter element; 321, second activated carbon layer; 40, second flow channel.

[0036] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) 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 indication will also change accordingly.

[0039] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0040] In addition, the descriptions of "first", "second", etc. in the present utility model are only used 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 defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is 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 utility model.

[0041] In the related art, a water purification device is provided with a plurality of filter elements to improve the filtering effect. However, this results in the water purification device being too large in size and does not take advantage of the miniaturization development of the equipment.

[0042] In view of this, the utility model provides a filter element structure and a water purification device.

[0043] like Figures 1 to 4 As shown, the filter element structure 100 provided in the embodiment of the utility model includes a housing 10, a pre-filter element 20 and a reverse osmosis filter assembly 30; the pre-filter element 20 is arranged in the housing 10 for filtering raw water; the reverse osmosis filter assembly 30 is arranged in the housing 10 and is arranged along the axial direction of the housing 10 with the pre-filter element 20, and the reverse osmosis filter assembly 30 is used to filter the water flow filtered by the pre-filter element 20.

[0044] By adopting the above technical solution, by setting the pre-filter element 20 and the reverse osmosis filter assembly 30, the raw water can be pre-filtered and reverse osmosis filtered, so that the raw water is filtered at least twice, effectively improving the filtering effect and greatly improving the water quality; the pre-filter element 20 and the reverse osmosis filter assembly 30 are both arranged in the housing 10, that is, the pre-filter element 20 and the reverse osmosis filter assembly 30 are integrated. Compared with the technical solution of separately setting multiple filter elements, the integration is improved, the volume of the filter element structure 100 is greatly reduced, and it is beneficial to the water purification device. Miniaturization development; in addition, the pre-filter element 20 and the reverse osmosis filter assembly 30 are both arranged in the outer shell 10, so that the filter element structure 100 is designed as an integrated unit. Compared with the segmented welding method in the related art, the process is simpler and the processing efficiency is effectively improved; by arranging the pre-filter element 20 and the reverse osmosis filter assembly 30 along the axial direction of the outer shell 10, the radial dimension of the outer shell 10 is reduced, which is conducive to the transverse arrangement of the filter element structure 100 in the purification device, making the layout of the various components of the purification device more reasonable, which is conducive to the miniaturization development of the purification device.

[0045] Therefore, the filter element structure 100 provided in the embodiment of the utility model has high integration, simple manufacturing process, small overall size, and more reasonable layout of components of the purification device, which is conducive to the miniaturization of the purification device.

[0046] As an implementation method, refer to Figure 3 and Figure 4 As shown, the housing 10 is provided with a first water inlet 11, a second water inlet 12, a first water outlet 13, a second water outlet 14 and a third water outlet 15; the first water inlet 11 and the first water outlet 13 are both connected with the pre-filter element 20, the first water inlet 11 is used for supplying raw water into the pre-filter element 20, and the first water outlet 13 is used for supplying water filtered by the pre-filter element 20 to flow out of the housing 10; the second water inlet 12, the second water outlet 14 and the third water outlet 15 are all connected with the reverse osmosis filter assembly 30, the second water inlet 12 is used for supplying water filtered by the pre-filter element 20 to flow into the reverse osmosis filter assembly 30, the second water outlet 14 is used for supplying waste water generated by filtration by the reverse osmosis filter assembly 30 to flow out of the housing 10, and the third water outlet 15 is used for supplying pure water generated by filtration by the reverse osmosis filter assembly 30 to flow out of the housing 10.

[0047] In this embodiment, the filter element structure 100 adopts a five-hole setting. In a specific application, the first water outlet 13 and the second water inlet 12 are connected by a water pipe so that the water filtered by the pre-filter element 20 can be delivered to the reverse osmosis filter assembly 30. According to the reverse osmosis filtration principle, it is necessary to apply a pressure greater than the osmotic pressure to the water inlet end of the reverse osmosis filter assembly 30 so that the water can penetrate through the reverse osmosis filter assembly 30 to its water outlet end. By setting the filter element structure 100 in a five-hole manner, the first water outlet 13 and the second water inlet 12 are connected by a water pipe, and a booster device (such as a pressure pump) can be added to the water pipe, thereby improving the filtering effect of the reverse osmosis filter assembly 30.

[0048] In another embodiment, the filter element structure 100 may be arranged in a three-hole manner. When this scheme is adopted, the first water outlet 13 and the second water inlet 12 in the five-hole scheme are omitted, and the water filtered by the pre-filter element 20 is not transported through the water pipe outside the housing 10, but directly transported to the reverse osmosis filter assembly 30 through the delivery pipeline arranged inside the housing 10. The booster device can be arranged upstream of the first water inlet 11.

[0049] As an embodiment, the first water inlet 11, the second water inlet 12, the first water outlet 13, the second water outlet 14 and the third water outlet 15 are opened at the same end of the shell 10 along the axial direction of the shell 10. In this way, it is convenient for each water inlet and each water outlet to be connected with the corresponding upstream and downstream waterways. Of course, in a specific application, as an alternative embodiment, the first water inlet 11, the second water inlet 12, the first water outlet 13, the second water outlet 14 and the third water outlet 15 are not arranged at the same end or are partially arranged at the same end.

[0050] As an implementation method, refer to Figures 2 to 4 As shown, the housing 10 includes a housing body 16, a first cover body 17 and a second cover body 18; the housing body 16 is a tubular structure, the first cover body 17 and the second cover body 18 are connected to both ends of the housing body 16, and are enclosed with the housing body 16 to form a receiving cavity (not shown), the pre-filter element 20 and the reverse osmosis filter assembly 30 are received in the receiving cavity along the axial direction of the housing body 16, and the first water inlet 11, the second water inlet 12, the first water outlet 13, the second water outlet 14 and the third water outlet 15 are all provided in the first cover body 17 or the second cover body 18. The housing 10 has a regular structure, which is conducive to the layout of the filter element structure 100 in the purification device.

[0051] As an implementation mode, the first water inlet 11, the second water inlet 12, the first water outlet 13, the second water outlet 14 and the third water outlet 15 are all provided in the first cover 17, the first cover 17 and the shell body 16 are integrally formed, and the second cover 18 is detachably connected to the shell body 16. The second cover 18 is detachably connected to the shell body 16, and the shell 10 can be opened to maintain the pre-filter element 20 and the reverse osmosis filter assembly 30 in the shell 10; the first cover 17 and the shell body 16 are integrally formed, which can reduce the number of parts of the shell 10 and improve the assembly efficiency of the filter element structure 100.

[0052] Based on the previous implementation method, Figure 7 As shown, the first cover body 17 is provided with five grooves 171 on the side facing the accommodating cavity, four of which are annular, and the five grooves 171 are arranged in sequence from the inside to the outside, and the notch of each groove 171 is arranged toward the accommodating cavity, and a through hole is opened in the bottom wall of each groove 171, and the through holes of each groove 171 from the outside to the inside sequentially form the second water inlet 12, the first water inlet 11, the first water outlet 13, the second water outlet 14 and the third water outlet 15.

[0053] On the basis of the previous embodiment, the pre-filter element 20 is disposed at one end of the reverse osmosis filter assembly 30 close to the first water inlet 11. That is, the pre-filter element 20 is disposed at one end of the reverse osmosis filter assembly 30 close to the first cover 17, and the pre-filter element 20 is located between the reverse osmosis filter assembly 30 and the first cover 17. It can be understood that in other embodiments, the pre-filter element 20 can also be disposed at one end of the reverse osmosis filter assembly 30 away from the first cover 17.

[0054] As an implementation method, refer to Figures 3 to 5 As shown, the pre-filter element 20 includes a pre-shell 21 and a pre-filter body 22; the pre-shell 21 is penetrated by a pre-pipe 211 and a pre-cavity 212 arranged circumferentially around the pre-pipe 211, the pre-pipe 211 is used to guide the water flow generated by the filtration of the reverse osmosis filtration assembly 30, and the pre-filter body 22 is accommodated in the pre-cavity 212 and is located on the waterway formed by the first water inlet 11 and the first water outlet 13. Such a configuration allows the pre-filter element 20 to be reasonably arranged in the shell, and meets the smoothness of the internal waterway, which is conducive to reducing the volume of the filter element structure 100.

[0055] Reference Figures 3 to 5As shown, the pre-filter element 20 also includes a separator tube 23, which is accommodated in the pre-pipe 211 to separate the pre-pipe 211 into two channels, one channel connecting the reverse osmosis filter component 30 and the second water outlet 14, and is used to guide the waste water generated by the filtration of the reverse osmosis filter component 30, and the other channel connecting the reverse osmosis filter component 30 and the third water outlet 15, and is used to guide the pure water generated by the filtration of the reverse osmosis filter component 30.

[0056] As an implementation method, refer to Figures 3 to 5 As shown, the pre-filter body 22 includes a PP cotton layer 221 and a first activated carbon layer 222. Both the PP cotton layer 221 and the first activated carbon layer 222 are tubular structures, and the PP cotton layer 221 is sleeved on the outer periphery of the first activated carbon layer 222. Raw water enters the pre-filter element 20 through the first water inlet 11, and flows out from the first water outlet 13 after being filtered by the PP cotton layer 221 and the first activated carbon layer 222 respectively. Larger particle impurities such as silt and rust in the water can be filtered through the PP cotton layer 221, and organic matter (such as residual chlorine, chloroform, carbon tetrachloride) and toxic substances in the water can be adsorbed through the first activated carbon layer 222, effectively improving the water quality.

[0057] As an implementation method, refer to Figure 3 and Figure 4 As shown, the reverse osmosis filter assembly 30 includes a reverse osmosis filter element 31 and a post filter element 32. The reverse osmosis filter element 31 is used to filter the water flow filtered by the pre filter element 20, and the post filter element 32 is used to filter the water flow filtered by the reverse osmosis filter element 31. The second water inlet 12 and the second water outlet 14 are both connected to the reverse osmosis filter element 31, and the third water outlet 15 is connected to the post filter element 32. Of course, in a specific application, as an alternative implementation scheme, it is also possible not to set the post filter element 32. When this scheme is adopted, the reverse osmosis filter assembly 30 includes a reverse osmosis filter element 31. The reverse osmosis filter element 31 is used to filter the water flow filtered by the pre filter element 20, and the second water inlet 12, the second water outlet 14 and the third water outlet 15 are all connected to the reverse osmosis filter element 31.

[0058] As an implementation mode, the reverse osmosis filter element 31 is circumferentially arranged around the post filter element 32. This arrangement can improve the integration of the reverse osmosis filter assembly 30.

[0059] The post-filter element 32 is a tubular structure with one end sealed, and its cavity is connected to the channel of the front pipe 211 connected to the third water outlet 15 , so that the pure water filtered by the post-filter element 32 can be guided to the third water outlet 15 .

[0060] Reference Figure 4As shown, the post-filter element 32 includes a second activated carbon layer 321, which can adsorb organic matter (such as residual chlorine, chloroform, carbon tetrachloride) and toxic substances in water, thereby effectively improving water quality.

[0061] As an implementation method, refer to Figure 3 , Figure 4 and Figure 6 As shown, the reverse osmosis filter element 31 includes a reverse osmosis membrane 311 and a one-way valve 312; the reverse osmosis membrane 311 includes an inlet side 3111, a pure water side 3112 and a wastewater side 3113, the one-way valve 312 is arranged between the inlet side 3111 and the second water inlet 12, the wastewater side 3113 is connected to the second water outlet 14, and the pure water side 3112 is connected to the third water outlet 15. When the filter element structure 100 is working, the one-way valve 312 is opened, the water path between the second water inlet 12 and the water inlet side 3111 is opened, and water can flow to the water inlet side 3111; when the filter element structure 100 stops working, the one-way valve 312 is closed, the water path between the second water inlet 12 and the water inlet side 3111 is disconnected, and there is no water flow on the water inlet side 3111, thereby preventing water from infiltrating into the pure water side 3112 without pressurization to increase the TDS value (i.e., total dissolved solids) of the pure water, thereby avoiding the generation of "first cup of water".

[0062] As an implementation method, refer to Figure 4 and Figure 6 As shown, the reverse osmosis filter element 31 also includes a first end cap 313, which is connected to the water inlet side 3111 and encloses the water inlet side 3111 to form a first flow channel 314; the first end cap 313 is provided with a water inlet hole 315 connected to the first flow channel 314, and the water inlet hole 315 is used to guide the water flow filtered by the pre-filter element 20 to the first flow channel 314; the one-way valve 312 is provided on the first end cap 313, which is used to open or close the water inlet hole 315. When the filter element structure 100 stops working, the one-way valve 312 closes the water inlet hole 315, so that there is no water flow on the water inlet side 3111, thereby avoiding the generation of "first cup of water".

[0063] As an implementation method, refer to Figure 3 , Figure 4 and Figure 6 As shown, the pre-filter element 20 and the reverse osmosis filter assembly 30 are both spaced apart from the housing 10 , and the gap forms a second flow channel 40 connecting the second water inlet 12 and the water inlet hole 315 , so that the water flow filtered by the pre-filter element 20 can be guided to the first flow channel 314 .

[0064] Furthermore, the embodiment of the utility model also provides a water purification device, comprising the above-mentioned filter element structure 100. By adopting the above-mentioned filter element structure 100, it is conducive to the miniaturization development of the water purification device.

[0065] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A filter element structure, characterized in that: include: The shell is provided with a first water inlet, a second water inlet and a first water outlet; A pre-filter element, the pre-filter element is arranged in the housing and communicated with the first water inlet, and is used for filtering raw water; A reverse osmosis filter assembly, the reverse osmosis filter assembly is arranged in the housing and arranged along the axial direction of the housing with the pre-filter element, the pre-filter element is arranged at one end of the reverse osmosis filter assembly close to the first water inlet, and the reverse osmosis filter assembly is used to filter the water flow filtered by the pre-filter element; The first water inlet and the first water outlet are both connected to the pre-filter element, the first water inlet is used for raw water to flow into the pre-filter element, and the first water outlet is used for water filtered by the pre-filter element to flow out of the housing; The second water inlet is communicated with the reverse osmosis filtration component, and the second water inlet is used for supplying water filtered by the pre-filter element into the reverse osmosis filtration component; the first water outlet and the second water inlet are connected by a water pipe.

2. The filter element structure according to claim 1, characterized in that: The shell is provided with a second water outlet and a third water outlet; The second water outlet and the third water outlet are both connected to the reverse osmosis filtration component. The second water outlet is used to allow waste water generated by filtration by the reverse osmosis filtration component to flow out of the shell, and the third water outlet is used to allow pure water generated by filtration by the reverse osmosis filtration component to flow out of the shell.

3. The filter element structure according to claim 2, characterized in that: The first water inlet, the second water inlet, the first water outlet, the second water outlet and the third water outlet are opened at the same end of the shell along the axial direction of the shell.

4. The filter element structure according to any one of claims 2 to 3, characterized in that: The reverse osmosis filter assembly comprises a reverse osmosis filter element and a post filter element, wherein the reverse osmosis filter element is used to filter the water flow filtered by the pre filter element, and the post filter element is used to filter the water flow filtered by the reverse osmosis filter element, the second water inlet and the second water outlet are both connected to the reverse osmosis filter element, and the third water outlet is connected to the post filter element; or The reverse osmosis filtration component comprises a reverse osmosis filter element, and the reverse osmosis filter element is used to filter the water flow filtered by the pre-filter element. The second water inlet, the second water outlet and the third water outlet are all connected to the reverse osmosis filter element.

5. The filter element structure according to claim 4, characterized in that: The reverse osmosis filtration component includes a reverse osmosis filter element and a post-filter element; The reverse osmosis filter element is circumferentially arranged around the post-filter element.

6. The filter element structure according to claim 4, characterized in that: The reverse osmosis filter element comprises a reverse osmosis membrane and a one-way valve; The reverse osmosis membrane includes an inlet side, a pure water side and a wastewater side. The one-way valve is arranged between the inlet side and the second water inlet. The wastewater side is connected to the second water outlet, and the pure water side is connected to the third water outlet.

7. The filter element structure according to claim 6, characterized in that: The reverse osmosis filter element further includes a first end cap, which is connected to the water inlet side and encloses the water inlet side to form a first flow channel; The first end cover is provided with a water inlet hole connected to the first flow channel, and the water inlet hole is used to guide the water flow filtered by the pre-filter element to the first flow channel; The one-way valve is arranged on the first end cover and is used to open or close the water inlet hole.

8. The filter element structure according to any one of claims 2 to 3, characterized in that: The pre-filter element comprises a pre-shell and a pre-filter body; The front shell is penetrated by a front pipe and a front cavity circumferentially arranged around the front pipe. The front pipe is used to guide the water flow generated by filtration of the reverse osmosis filtration component. The front filter body is accommodated in the front cavity and is located on the water path formed by the first water inlet and the first water outlet.

9. A water purification device, characterized in that: It comprises a filter element structure as described in any one of claims 1 to 8.

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