Multi-stage filter element structure and water purification equipment

Abstract

The utility model discloses a multi-stage filter element structure and water purification equipment, and relates to the technical field of water purification, the multi-stage filter element structure comprises a bottle body structure and a first cover body assembly, the bottle body structure is internally provided with two or more filter cavities, and all the filter cavities form a series-connected water path structure through a plurality of fluid flow channels; a water inlet hole and a water outlet hole are formed in the bottle body structure, the filter cavity at the head end of the water path structure is communicated with the water inlet hole, and the filter cavity at the tail end of the water path structure is communicated with the water outlet hole; the filter cavity is used for accommodating a filter material; an opening is formed in one end of the filter cavity; the first cover body assembly is connected with one end of the bottle body structure; the first cover body assembly comprises two or more than two end covers, and the end covers are connected with the filter cavities in a one-to-one correspondence manner; the end cover is positioned at the opening end of the filter cavity. According to the technical scheme provided by the invention, external connecting pieces required for independently connecting each filter cavity are reduced, so that the overall structure is simplified, assembly connecting points are reduced, and the filter has the advantages of simple structure, low water leakage risk and high production efficiency.

Description

Technical Field

[0001] This application relates to the field of water purification technology, and in particular to a multi-stage filter structure and water purification equipment. Background Technology

[0002] Currently, water purifiers are widely used in water treatment, biological separation, and air filtration. Common multi-stage water purifiers consist of multiple filter cartridges connected by threaded joints in a spiral configuration. However, the threaded joint structure limits the sealing performance between the filter cartridges, and the need for wiring between cartridges increases the risk of leakage. To improve the sealing performance, PTFE tape is typically wrapped around the threaded joints and wiring terminals, leading to a complex overall structure and reduced production efficiency. Therefore, existing multi-stage filter cartridge structures suffer from structural complexity, high leakage risk, and low production efficiency. Utility Model Content

[0003] The main purpose of this application is to propose a multi-stage filter structure and water purification equipment, which aims to solve the problems of complex structure, high risk of leakage and low production efficiency of existing multi-stage filter structures.

[0004] To achieve the above objectives, the multi-stage filter structure proposed in this application includes:

[0005] The bottle structure includes two or more filter chambers connected in series via multiple fluid channels to form a water channel structure. The bottle structure has an inlet and an outlet, with the filter chamber at the beginning of the water channel structure communicating with the inlet, and the filter chamber at the end of the water channel structure communicating with the outlet. Each filter chamber contains filter media, and one end of each filter chamber has an opening.

[0006] A first cap assembly is connected to one end of the bottle structure; the first cap assembly includes two or more end caps, each end cap being connected to a filter cavity in a corresponding manner; the end cap is located at the end of the filter cavity that has an opening.

[0007] In one embodiment, the bottle structure includes two or more barrels, each barrel having a filter chamber inside; the outer walls of the barrels are fixedly connected to each other, and a fluid flow channel is provided on the side wall of the barrel, with one end of the fluid flow channel communicating with the filter chamber of one barrel and the other end of the fluid flow channel communicating with the filter chamber of another barrel.

[0008] In one embodiment, the multi-stage filter structure further includes a second cover assembly, which includes two or more upper filter covers and two or more lower filter covers. One upper filter cover and one lower filter cover are simultaneously disposed within one filter cavity, and filter media is disposed between the upper and lower filter covers. Both the upper and lower filter covers have microporous structures; and / or,

[0009] The end cap is sealed to the opening of the filter chamber.

[0010] In one embodiment, the bottle structure has two filter chambers, which are respectively configured as a first filter chamber and a second filter chamber. One end of the first filter chamber is connected to the water inlet, and the end of the first filter chamber away from the water inlet is connected to one end of the second filter chamber through a first fluid flow channel. The end of the second filter chamber away from the first fluid flow channel is connected to the water outlet. The cap assembly includes two end caps, which are respectively configured as a first end cap and a second end cap. The first end cap is connected to the end of the first filter chamber with an opening, and the second end cap is connected to the end of the second filter chamber with an opening.

[0011] In one embodiment, the bottle structure includes three filter chambers, which are respectively designated as a first filter chamber, a second filter chamber, and a third filter chamber, arranged sequentially. One end of the first filter chamber is connected to the water inlet. The end of the first filter chamber away from the water inlet is connected to one end of the second filter chamber via a first fluid flow channel. The end of the second filter chamber away from the first fluid flow channel is connected to one end of the third filter chamber via a second fluid flow channel. The end of the third filter chamber away from the second fluid flow channel is connected to the water outlet. The cap assembly includes three end caps, which are respectively designated as a first end cap, a second end cap, and a third end cap. The first end cap is connected to the end of the first filter chamber with an opening, the second end cap is connected to the end of the second filter chamber with an opening, and the third end cap is connected to the end of the third filter chamber with an opening.

[0012] In one embodiment, the bottle structure includes six filter chambers, which are respectively configured as a first filter chamber, a second filter chamber, a third filter chamber, a fourth filter chamber, a fifth filter chamber, and a sixth filter chamber. One end of the first filter chamber is connected to the water inlet. The end of the first filter chamber away from the water inlet is connected to one end of the second filter chamber via a first fluid flow channel. The end of the second filter chamber away from the first fluid flow channel is connected to one end of the third filter chamber via a second fluid flow channel. The end of the third filter chamber away from the second fluid flow channel is connected to the fourth filter chamber via a third fluid flow channel. The end of the fourth filter chamber away from the third fluid flow channel is connected to one end of the fifth filter chamber via a fourth fluid flow channel. The end of the fifth filter chamber away from the third fluid flow channel is connected to the fifth filter chamber via a fourth fluid flow channel. One end of the fourth fluid flow channel is connected to one end of the sixth filter chamber; the end of the sixth filter chamber away from the fourth fluid flow channel is connected to the water outlet; the cover assembly includes six end caps, which are respectively configured as a first end cap, a second end cap, a third end cap, a fourth end cap, a fifth end cap, and a sixth end cap. The first end cap is connected to the end of the first filter chamber with an opening, the second end cap is connected to the end of the second filter chamber with an opening, the third end cap is connected to the end of the third filter chamber with an opening, the fourth end cap is connected to the end of the fourth filter chamber with an opening, the fifth end cap is connected to the end of the fifth filter chamber with an opening, and the sixth end cap is connected to the end of the sixth filter chamber with an opening.

[0013] In one embodiment, the first filter cavity, the second filter cavity, the third filter cavity, the fourth filter cavity, the fifth filter cavity, and the sixth filter cavity are arranged in a matrix.

[0014] In one embodiment, the bottle structure is formed into a single unit through an injection molding process.

[0015] In one embodiment, the multi-stage filter structure further includes a connecting assembly, which includes an inlet connector and an outlet connector. The inlet connector is sealed to the inlet hole, and the outlet connector is sealed to the outlet hole.

[0016] This application also proposes a water purification device, including the multi-stage filter structure as described above.

[0017] The technical solution of this application simplifies the overall structure by setting two or more filter chambers on the bottle body structure and forming a series water channel structure through multiple fluid flow channels, reducing the number of components and connection points, thereby reducing structural complexity. Since each filter chamber is connected to the first cover assembly through an end cap, and the end cap corresponds one-to-one with the filter chamber, the assembly convenience of the multi-stage filter structure is improved, while ensuring the overall sealing of the multi-stage filter structure and reducing the risk of leakage. Furthermore, by reducing the external connectors required to individually connect each filter chamber, assembly during the production process is simpler and faster, improving production efficiency. This multi-stage filter structure has the advantages of simple structure, low risk of leakage, and high production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 An exploded view of an embodiment of the multi-stage filter element structure provided in this application;

[0020] Figure 2 A schematic diagram of the internal structure of an embodiment of the multi-stage filter element structure provided in this application;

[0021] Figure 3 This is a schematic diagram of the internal structure of another embodiment of the multi-stage filter element structure provided in this application.

[0022] Explanation of icon numbers:

[0023] 1. Bottle body structure; 11. Filter chamber; 111. First filter chamber; 112. Second filter chamber; 113. Third filter chamber; 114. Fourth filter chamber; 115. Fifth filter chamber; 116. Sixth filter chamber; 121. First fluid flow channel; 122. Second fluid flow channel; 123. Third fluid flow channel; 124. Fourth fluid flow channel; 13. Water inlet; 14. Water outlet; 15. Barrel body; 2. First cover assembly; 21. End cap; 211. First end cap; 212. Second end cap; 213. Third end cap; 214. Fourth end cap; 215. Fifth end cap; 216. Sixth end cap; 3. Second cover assembly; 31. Upper filter cap; 32. Lower filter cap; 4. Connecting assembly; 411. Water inlet connector; 42. Water outlet connector.

[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0028] Currently, water purifiers are widely used in water treatment, biological separation, and air filtration. Common multi-stage water purifiers consist of multiple filter cartridges connected by threaded joints in a spiral configuration. However, the threaded joint structure limits the sealing performance between the filter cartridges, and the need for wiring between cartridges increases the risk of leakage. To improve the sealing performance, PTFE tape is typically wrapped around the threaded joints and wiring terminals, leading to a complex overall structure and reduced production efficiency. Therefore, existing multi-stage filter cartridge structures suffer from structural complexity, high leakage risk, and low production efficiency.

[0029] To address the aforementioned issues, this application proposes a multi-stage filter structure.

[0030] Please see Figures 1 to 3In one embodiment of this application, the multi-stage filter structure includes a bottle structure 1 and a first cap assembly 2. The bottle structure 1 has two or more filter chambers 11, and all filter chambers 11 are connected in series through multiple fluid channels to form a water channel structure. The bottle structure 1 has an inlet hole 13 and an outlet hole 14, wherein the filter chamber 11 located at the first end of the water channel structure is connected to the inlet hole 13, and the filter chamber 11 located at the tail end of the water channel structure is connected to the outlet hole 14. The filter chamber 11 is used to contain filter media. One end of the filter chamber 11 is provided with an opening. The first cap assembly 2 is connected to one end of the bottle structure 1. The first cap assembly 2 includes two or more end caps 21, and the end caps 21 are connected to the filter chambers 11 in a one-to-one correspondence. The end caps 21 are located at the end of the filter chamber 11 with the opening.

[0031] In the above structure, by setting two or more filter chambers 11 on the bottle structure 1 and forming a series water channel structure through multiple fluid flow channels, the overall structure is simplified, the number of components and connection points are reduced, and thus the complexity of the structure is reduced. Since each filter chamber 11 is connected to the first cover assembly 2 through an end cap 21, and the end cap 21 corresponds one-to-one with the filter chamber 11, the assembly convenience of the multi-stage filter element structure is improved, while ensuring the overall sealing of the multi-stage filter element structure and reducing the risk of leakage. In addition, since the external connecting parts required to connect each filter chamber 11 individually are reduced, the assembly process in the production process is simpler and faster, improving production efficiency. This multi-stage filter element structure has the advantages of simple structure, low risk of leakage, and high production efficiency.

[0032] In one embodiment, the bottle structure 1 includes two or more barrels 15, each barrel 15 having a filter chamber 11 inside; the outer walls of the barrels 15 are fixedly connected to each other, and a fluid flow channel is provided on the side wall of the barrel 15, with one end of the fluid flow channel communicating with the filter chamber 11 of one barrel 15 and the other end of the fluid flow channel communicating with the filter chamber 11 of the other barrel 15.

[0033] By fixing multiple barrels 15 together and integrating the fluid channels into the side walls of the barrels 15, the overall structure is simplified by reducing additional connecting parts and complex piping layouts. Furthermore, since the fluid channels are directly located on the side walls of the barrels 15, fewer connection points are added, reducing the risk of leakage and decreasing assembly steps in the production process, thus improving production efficiency.

[0034] In one embodiment, the multi-stage filter element structure further includes a second cover assembly 3, which includes two or more upper filter covers 31 and two or more lower filter covers 32. One upper filter cover 31 and one lower filter cover 32 are simultaneously disposed in one filter cavity 11, and filter material is disposed between the upper filter cover 31 and the lower filter cover 32. Both the upper filter cover 31 and the lower filter cover 32 are provided with microporous structures.

[0035] In the above structure, the pores of the microporous structures on the upper filter cover 31 and the lower filter cover 32 are larger than the particle size of the filter media; the microporous structures on the upper filter cover 31 and the lower filter cover 32 can prevent the filter media from flowing out of the filter chamber 11, that is, to prevent the filter media particles from flowing out through the pores, thereby ensuring the filtration effect. It should be noted that each filter chamber 11 is provided with one upper filter cover 31 and one lower filter cover 32.

[0036] In one embodiment, the end cap 21 is sealed to the opening of the filter chamber 11.

[0037] The end cap 21 is sealed to the opening of the filter chamber 11 to prevent leakage of water or other fluids when passing through the filter chamber 11, thus ensuring the sealing performance and reliability of the multi-stage filter structure. The sealing connection can be achieved by using a sealing ring or applying sealant at the connection between the end cap 21 and the opening of the filter chamber 11.

[0038] In one embodiment, the bottle structure 1 is provided with two filter chambers 11, which are respectively configured as a first filter chamber 111 and a second filter chamber 112. One end of the first filter chamber 111 is connected to the water inlet 13, and the end of the first filter chamber 111 away from the water inlet 13 is connected to one end of the second filter chamber 112 through a first fluid flow channel 121. The end of the second filter chamber 112 away from the first fluid flow channel 121 is connected to the water outlet 14. The cap assembly includes two end caps 21, which are respectively configured as a first end cap 211 and a second end cap 212. The first end cap 211 is connected to the end of the first filter chamber 111 with an opening, and the second end cap 212 is connected to the end of the second filter chamber 112 with an opening.

[0039] In the above structure, the first filter chamber 111 and the second filter chamber 112 are connected in series through the first fluid flow channel 121, so that the fluid passes through the first filter chamber 111 and the second filter chamber 112 in sequence, which can achieve multi-stage filtration and improve the filtration effect. Specifically, the fluid to be filtered enters the first filter chamber 111 through the water inlet 13. It first undergoes preliminary filtration through the filter media in the first filter chamber 111 to form the first filtered fluid. Then, the first filtered fluid enters the second filter chamber 112 through the first fluid flow channel 121 and undergoes further filtration through the filter media in the second filter chamber 112 to form the second filtered fluid. The second filtered fluid is finally output to the outside through the water outlet 14. The two filtrations of the fluid to be filtered can more effectively remove impurities. In addition, the first filter chamber 111 and the second filter chamber 112 are integrated into a bottle structure 1 and connected by the first fluid flow channel 121, making the whole structure more compact and saving space. The first filter chamber 111 is connected to the first end cap 211, and the second filter chamber 112 is connected to the second end cap 212, making the maintenance and filter material replacement of each filter chamber 11 simpler. The operation can be carried out by simply removing the corresponding end cap 21.

[0040] In another embodiment, the bottle structure 1 is provided with three filter chambers 11, which are respectively configured as a first filter chamber 111, a second filter chamber 112, and a third filter chamber 113, arranged sequentially. One end of the first filter chamber 111 is connected to the water inlet 13, and the end of the first filter chamber 111 away from the water inlet 13 is connected to one end of the second filter chamber 112 through a first fluid flow channel 121. The end of the second filter chamber 112 away from the first fluid flow channel 121 is connected to... The second fluid flow channel 122 is connected to one end of the third filter chamber 113; the end of the third filter chamber 113 away from the second fluid flow channel 122 is connected to the water outlet 14; the cover assembly includes three end caps 21, which are respectively configured as a first end cap 211, a second end cap 212 and a third end cap 213. The first end cap 211 is connected to the end of the first filter chamber 111 with an opening, the second end cap 212 is connected to the end of the second filter chamber 112 with an opening, and the third end cap 213 is connected to the end of the third filter chamber 113 with an opening.

[0041] By setting up a first filter chamber 111, a second filter chamber 112, and a third filter chamber 113, deeper filtration can be achieved. Each of the three filter chambers 11 can be loaded with different types of filter media, and the filter media in each stage of the filter chamber 11 can be optimized for different pollutants or impurities, thereby improving the overall filtration effect. Since the first filter chamber 111, the second filter chamber 112, and the third filter chamber 113 are all integrated within a single bottle structure 1 and connected by a fluid flow channel, the entire structure remains compact and space-saving.

[0042] In another embodiment, the bottle structure 1 is provided with six filter chambers 11, which are respectively configured as a first filter chamber 111, a second filter chamber 112, a third filter chamber 113, a fourth filter chamber 114, a fifth filter chamber 115, and a sixth filter chamber 116. One end of the first filter chamber 111 is connected to the water inlet 13. The end of the first filter chamber 111 away from the water inlet 13 is connected to one end of the second filter chamber 112 through a first fluid flow channel 121. The end of the second filter chamber 112 away from the first fluid flow channel 121 is connected to one end of the third filter chamber 113 through a second fluid flow channel 122. The end of the third filter chamber 113 away from the second fluid flow channel 122 is connected to the fourth filter chamber 114 through a third fluid flow channel 123. The end of the fourth filter chamber 114 away from the third fluid flow channel 123 is connected to one end of the fifth filter chamber 115 through a fourth fluid flow channel 124. One end of filter chamber 115 away from the fourth fluid flow channel 124 is connected to one end of the sixth filter chamber 116; the end of the sixth filter chamber 116 away from the fourth fluid flow channel 124 is connected to the water outlet 14; the cover assembly includes four end caps 21, which are respectively configured as a first end cap 211, a second end cap 212, a third end cap 213, a fourth end cap 214, a fifth end cap 215, and a sixth end cap 216. The first end cap 211 is connected to the end of the first filter chamber 111 with an opening, the second end cap 212 is connected to the end of the second filter chamber 112 with an opening, the third end cap 213 is connected to the end of the third filter chamber 113 with an opening, the fourth end cap 214 is connected to the end of the fourth filter chamber 114 with an opening, the fifth end cap 215 is connected to the end of the fifth filter chamber 115 with an opening, and the sixth end cap 216 is connected to the end of the sixth filter chamber 116 with an opening.

[0043] By configuring the first filter chamber 111, the second filter chamber 112, the third filter chamber 113, the fourth filter chamber 114, the fifth filter chamber 115, and the sixth filter chamber 116, deeper filtration can be achieved. Each of the six filter chambers 11 can be loaded with different types of filter media, and the filter media in each stage of the filter chamber 11 can be optimized for different pollutants or impurities, thereby improving the overall filtration effect. Since the first filter chamber 111, the second filter chamber 112, the third filter chamber 113, the fourth filter chamber 114, the fifth filter chamber 115, and the sixth filter chamber 116 are all integrated within a single bottle structure 1 and connected by a fluid flow channel, the entire structure remains compact and space-saving. The first filter chamber 111 is connected to the first end cap 211, the second filter chamber 112 is connected to the second end cap 212, the third filter chamber 113 is connected to the third end cap 213, the fourth filter chamber 114 is connected to the fourth end cap 214, the fifth filter chamber 115 is connected to the fifth end cap 215, and the sixth filter chamber 116 is connected to the sixth end cap 216. This makes the maintenance and replacement of filter media for each filter chamber 11 simpler, requiring only the removal of the corresponding end cap 21 for operation. More filtration levels can be added as needed, and more filter chambers 11 and fluid channels can be expanded to form a compact multi-stage filter element structure.

[0044] In one embodiment, the first filter chamber 111, the second filter chamber 112, the third filter chamber 113, the fourth filter chamber 114, the fifth filter chamber 115 and the sixth filter chamber 116 are arranged in a matrix.

[0045] In the above structure, the first filter cavity 111, the second filter cavity 112, the third filter cavity 113, the fourth filter cavity 114, the fifth filter cavity 115, and the sixth filter cavity 116 are arranged in a matrix, which can maximize the space utilization within the bottle structure 1, allowing more filter cavities 11 to be integrated within a limited space. In addition, the matrix arrangement can enhance the structural stability of the entire bottle structure 1, making the bottle structure 1 more robust and durable.

[0046] In one embodiment, the bottle structure 1 is formed into an integral structure by injection molding.

[0047] The bottle structure 1 uses injection molding technology to achieve one-piece molding of complex shapes, which can quickly produce a large number of bottle structures 1 of the same specifications. This reduces the assembly steps in the manufacturing process, lowers labor costs and the risk of assembly errors, thereby improving production efficiency and cost-effectiveness.

[0048] In one embodiment, the multi-stage filter structure further includes a connecting component 4, which includes an inlet connector 411 and an outlet connector 42. The inlet connector 411 is sealed to the inlet hole 13, and the outlet connector 42 is sealed to the outlet hole 14.

[0049] The technical solution of this application simplifies the overall structure and reduces the number of components and connection points by setting two or more filter chambers 11 on the bottle structure 1 and forming a series water channel structure through multiple fluid flow channels, thereby reducing the complexity of the structure. Since each filter chamber 11 is connected to the first cover assembly 2 through an end cap 21, and the end cap 21 corresponds one-to-one with the filter chamber 11, the assembly convenience of the multi-stage filter element structure is improved, while ensuring the overall sealing of the multi-stage filter element structure and reducing the risk of leakage. In addition, the reduction of external connecting parts required to connect each filter chamber 11 individually makes the assembly process simpler and faster, improving production efficiency. This multi-stage filter element structure has the advantages of simple structure, low risk of leakage, and high production efficiency.

[0050] This application also proposes a water purification device, which includes a multi-stage filter structure. The specific structure of the multi-stage filter structure is as described in the above embodiments. Since this water purification device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0051] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A multi-stage filter element structure, characterized in that, include: The bottle structure includes two or more filter chambers connected in series via multiple fluid channels to form a water channel structure. The bottle structure has an inlet and an outlet. The filter chamber at the beginning of the water channel structure communicates with the inlet, and the filter chamber at the end of the water channel structure communicates with the outlet. Each filter chamber contains filter media, and one end of each filter chamber has an opening. A first cap assembly is connected to one end of the bottle structure; the first cap assembly includes two or more end caps, each end cap being connected to a filter cavity in a corresponding manner; the end cap is located at the end of the filter cavity that has an opening.

2. The multi-stage filter structure as described in claim 1, characterized in that, The bottle structure includes two or more barrels, each barrel containing a filter chamber; the outer walls of the barrels are fixedly connected to each other, and a fluid channel is located on the side wall of the barrel, with one end of the fluid channel communicating with the filter chamber of one barrel and the other end communicating with the filter chamber of another barrel.

3. The multi-stage filter structure as described in claim 1, characterized in that, It also includes a second cover assembly, which comprises two or more upper filter covers and two or more lower filter covers, wherein one upper filter cover and one lower filter cover are simultaneously disposed within one filter cavity, and filter media is disposed between the upper filter cover and the lower filter cover; both the upper filter cover and the lower filter cover are provided with microporous structures; and / or, The end cap is sealed to the opening of the filter chamber.

4. The multi-stage filter structure as described in any one of claims 1 to 3, characterized in that, The bottle structure contains two filter chambers, which are respectively designated as a first filter chamber and a second filter chamber. One end of the first filter chamber is connected to the water inlet, and the end of the first filter chamber away from the water inlet is connected to one end of the second filter chamber through a first fluid flow channel. The end of the second filter chamber away from the first fluid flow channel is connected to the water outlet. The cap assembly includes two end caps, which are respectively designated as a first end cap and a second end cap. The first end cap is connected to the end of the first filter chamber with an opening, and the second end cap is connected to the end of the second filter chamber with an opening.

5. The multi-stage filter structure as described in any one of claims 1 to 3, characterized in that, The bottle structure contains three filter chambers, which are respectively designated as a first filter chamber, a second filter chamber, and a third filter chamber, arranged sequentially. One end of the first filter chamber is connected to the water inlet. The end of the first filter chamber away from the water inlet is connected to one end of the second filter chamber via a first fluid flow channel. The end of the second filter chamber away from the first fluid flow channel is connected to one end of the third filter chamber via a second fluid flow channel. The end of the third filter chamber away from the second fluid flow channel is connected to the water outlet. The cap assembly includes three end caps, which are respectively designated as a first end cap, a second end cap, and a third end cap. The first end cap is connected to the end of the first filter chamber with an opening, the second end cap is connected to the end of the second filter chamber with an opening, and the third end cap is connected to the end of the third filter chamber with an opening.

6. The multi-stage filter structure as described in any one of claims 1 to 3, characterized in that, The bottle structure contains six filter chambers, which are respectively designated as a first filter chamber, a second filter chamber, a third filter chamber, a fourth filter chamber, a fifth filter chamber, and a sixth filter chamber. One end of the first filter chamber is connected to the water inlet. The end of the first filter chamber away from the water inlet is connected to one end of the second filter chamber via a first fluid flow channel. The end of the second filter chamber away from the first fluid flow channel is connected to one end of the third filter chamber via a second fluid flow channel. The end of the third filter chamber away from the second fluid flow channel is connected to the fourth filter chamber via a third fluid flow channel. The end of the fourth filter chamber away from the third fluid flow channel is connected to one end of the fifth filter chamber via a fourth fluid flow channel. The fifth filter chamber is located away from the first filter chamber. One end of the four fluid flow channel is connected to one end of the sixth filter chamber; the end of the sixth filter chamber away from the fourth fluid flow channel is connected to the water outlet; the cover assembly includes six end caps, which are respectively configured as a first end cap, a second end cap, a third end cap, a fourth end cap, a fifth end cap, and a sixth end cap. The first end cap is connected to the end of the first filter chamber with an opening, the second end cap is connected to the end of the second filter chamber with an opening, the third end cap is connected to the end of the third filter chamber with an opening, the fourth end cap is connected to the end of the fourth filter chamber with an opening, the fifth end cap is connected to the end of the fifth filter chamber with an opening, and the sixth end cap is connected to the end of the sixth filter chamber with an opening.

7. The multi-stage filter structure as described in claim 6, characterized in that, The first filter chamber, the second filter chamber, the third filter chamber, the fourth filter chamber, the fifth filter chamber, and the sixth filter chamber are arranged in a matrix.

8. The multi-stage filter structure as described in any one of claims 1 to 3, characterized in that, The bottle structure is formed into a single unit through injection molding.

9. The multi-stage filter structure as described in any one of claims 1 to 3, characterized in that, It also includes a connecting assembly, which includes an inlet connector and an outlet connector, wherein the inlet connector is sealed to the inlet hole and the outlet connector is sealed to the outlet hole.

10. A water purification device, characterized in that, Includes a multi-stage filter structure as described in any one of claims 1 to 9.

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