Filter element structure and water purifier

Abstract

The present invention discloses a filter element structure and a water purifier. The filter element structure includes a filter bottle cap, a filter bottle body, and a limiting member. The filter bottle body includes an open end, and an opening is provided at the open end. The filter bottle cap is sleeved on the open end. The filter bottle body is provided with a first limiting portion and a second limiting portion that are spaced apart along the length direction of the filter bottle body. The first limiting portion and the second limiting portion are spaced apart from the filter bottle cap, and the first limiting portion is closer to the filter bottle cap than the second limiting portion. One end of the limiting member is provided with a first connecting portion, and the other end of the limiting member is provided with a third limiting portion for limiting cooperation with the first limiting portion and the second limiting portion. The limiting member can move between the second limiting portion and the third limiting portion through the limiting cooperation of the third limiting portion with the first limiting portion and the second limiting portion. When the limiting member moves in the direction from the second limiting portion to the first limiting portion, the first connecting portion is detachably connected to the filter bottle cap to limit the separation of the filter bottle cap from the open end and open the opening.

Description

Technical Field

[0001] The present invention relates to the technical field of water purifiers, and particularly to a filter element structure and a water purifier. Background Art

[0002] With the improvement of living standards, people pay more and more attention to the quality of life and health. The health problem of household drinking water has long been the focus of social attention. Therefore, people often choose water purifiers to purify household water to improve the quality of water used. A water purifier generally includes an installation cylinder, a filter bottle body and a filter bottle cap. The filter bottle cap is sleeved on the filter bottle body, and the filter bottle body is inserted into the installation cylinder. When it is necessary to replace or clean the filter element in the filter bottle body, the installation cylinder and the filter bottle body need to be disassembled and separated.

[0003] However, when the traditional water purifier is in use, when the installation cylinder is unscrewed from the filter bottle body, the filter bottle cap is likely to be unscrewed from the filter bottle body, resulting in the filter bottle cap being separated from the filter bottle body prior to the installation cylinder, causing water leakage in the filter bottle body and affecting the normal maintenance and use of the water purifier. Summary of the Invention

[0004] Based on this, in view of the problem that when the installation cylinder is unscrewed from the filter bottle body during the use of the traditional water purifier, the filter bottle cap is likely to be unscrewed from the filter bottle body, resulting in the filter bottle cap being separated from the filter bottle body prior to the installation cylinder, causing water leakage in the filter bottle body and affecting the normal maintenance and use of the water purifier, a filter element structure and a water purifier are provided. When the filter element structure and the water purifier are in use, the filter bottle cap and the filter bottle body are separated from the installation cylinder together, thereby avoiding the water leakage problem caused during the disassembly and assembly of the installation cylinder.

[0005] The specific technical solutions are as follows:

[0006] On the one hand, the present application relates to a filter element structure, including: a filter bottle cap, a filter bottle body and a limiting member. The filter bottle body includes an open end, and the open end is provided with an opening. The filter bottle cap is sleeved on the open end. The filter bottle body is provided with a first limiting portion and a second limiting portion that are spaced apart along the length direction of the filter bottle body. The first limiting portion and the second limiting portion are spaced apart from the filter bottle cap, and the first limiting portion is closer to the filter bottle cap than the second limiting portion. One end of the limiting member is provided with a first connecting portion, and the other end of the limiting member is provided with a third limiting portion for limiting and cooperating with the first limiting portion and the second limiting portion. The limiting member can move between the first limiting portion and the second limiting portion through the limiting cooperation of the third limiting portion with the first limiting portion and the second limiting portion. When the limiting member moves along the direction from the second limiting portion to the first limiting portion, the first connecting portion is detachably connected to the filter bottle cap to limit the separation of the filter bottle cap from the open end and open the opening.

[0007] The technical solutions are further described below:

[0008] In one embodiment, the limiting member is a limiting ring, the limiting ring is sleeved on the filter bottle body, and a third limiting portion is formed on the inner wall of the limiting ring. The third limiting portion includes a limiting buckle, a first limiting protrusion, and a second limiting protrusion. The first limiting protrusion and the second limiting protrusion are arranged at intervals along the circumferential direction of the limiting ring. The limiting buckle, the first limiting protrusion, and the second limiting protrusion are all installed in a limited manner between the first limiting portion and the second limiting portion;

[0009] The limiting buckle is in limiting cooperation with the first limiting portion, the first limiting protrusion and / or the second limiting protrusion are in limiting cooperation with the second limiting portion, and the first limiting portion is installed in a limited manner between the first limiting protrusion and the second limiting protrusion.

[0010] In one embodiment, the first connecting portion is a plugging protrusion, and the filter bottle cap is provided with a plugging groove that is in plugging cooperation with the plugging protrusion.

[0011] In one embodiment, an installation cylinder is further included. The filter bottle body is inserted into the installation cylinder. A fourth limiting portion is provided on the inner wall of the installation cylinder. When the filter bottle body extends into the installation cylinder, the fourth limiting portion is in limiting cooperation with the limiting ring and pushes the limiting ring to move along the direction from the second limiting portion to the first limiting portion, so that the first connecting portion is detachably connected to the filter bottle cap.

[0012] In one embodiment, an end cap is further included. An installation cavity is provided in the filter bottle body, the opening is communicated with the installation cavity, the filter bottle cap is provided with a receiving cavity, the filter bottle cap is sleeved on the opening end through the receiving cavity, the end cap is used to block the opening, and the end cap is connected to the inner wall of the receiving cavity;

[0013] Wherein, the filter bottle cap can move relative to the opening end. The filter bottle cap has a first state in which it moves relative to the opening end along the direction of sleeving on the opening end to drive the end cap to extend into the installation cavity along the opening, and a second state in which the filter bottle cap moves relative to the opening end along the direction of withdrawing from the opening end and drives the end cap to withdraw from the installation cavity along the opening.

[0014] In one embodiment, a connecting member is further included. The end cap is movably connected to the inner wall of the installation cavity through the connecting member;

[0015] When the filter bottle cap is in the first state, the filter bottle cap moves relative to the opening end along the direction of sleeving on the opening end and pushes the end cap to extend into the installation cavity along the opening through the inner wall of the receiving cavity;

[0016] When the filter bottle cap is in the second state, the filter bottle cap moves relative to the open end in a direction of exiting the open end and pulls the end cap to exit the installation cavity along the opening through the connecting member.

[0017] In one embodiment, a connecting member is further included, and the end cap is movably connected to the inner wall of the installation cavity through the connecting member;

[0018] When the filter bottle cap is in the first state, the filter bottle cap moves relative to the open end in a direction of sleeving on the open end and pushes the end cap to extend into the installation cavity along the opening through the inner wall of the accommodating cavity;

[0019] When the filter bottle cap is in the second state, the filter bottle cap moves relative to the open end in a direction of exiting the open end and pulls the end cap to exit the installation cavity along the opening through the connecting member.

[0020] In one embodiment, the inner wall of the accommodating cavity is rotatably connected to the filter bottle body.

[0021] In one embodiment, the filter bottle cap includes a mounting body fixedly provided on the inner wall of the accommodating cavity. The end cap is provided with a first mounting surface and a second mounting surface arranged oppositely, and the end cap is further provided with a mounting hole penetrating through the first mounting surface and the second mounting surface. The first mounting surface is closer to the bottom wall of the accommodating cavity than the second mounting surface;

[0022] The mounting body is movably inserted into the mounting hole from one side of the first mounting surface. One end of the connecting member extends into the mounting hole from one side of the second mounting surface and is connected to the mounting body, and the other end of the connecting member is in limit fit with the inner wall of the mounting hole or the second mounting surface.

[0023] In one embodiment, a supporting portion for supporting the first mounting surface is formed on the bottom wall of the accommodating cavity.

[0024] In one embodiment, a third limit protrusion is formed on the inner wall of the mounting hole. The third limit protrusion includes a first limit surface facing the second mounting surface. The height of the first limit surface from the first mounting surface is less than the length of the mounting body, and the other end of the connecting member is in limit fit with the first limit surface;

[0025] When the filter bottle cap is in the first state, the filter bottle cap moves relative to the open end in a direction of sleeving on the open end and pushes the end cap to extend into the installation cavity along the opening through the contact fit between the inner wall of the accommodating cavity and the first mounting surface;

[0026] When the filter bottle cap is in the second state, the filter bottle cap moves relative to the opening end in a direction of exiting the opening end and contacts and cooperates with the other end of the connecting member to pull the end cap out of the installation cavity along the opening.

[0027] On the other hand, the present application also relates to a water purifier including the filter element structure in any of the above embodiments.

[0028] When the above-mentioned filter element structure and water purifier are in use, the filter bottle body is inserted into the installation cylinder. At this time, under the push of the installation cylinder, the limiting member moves along the direction from the second limiting portion to the first limiting portion until the first connecting portion is detachably connected to the filter bottle cap. Furthermore, on the one hand, the filter bottle cap is restricted on the filter bottle body by the limiting member, and on the other hand, the limiting member is restricted on the filter bottle body by the second limiting portion and the first limiting portion. In this way, it is possible to prevent the filter bottle cap from being screwed off the filter bottle body when screwing the installation cylinder, thereby opening the opening and causing a water leakage problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and the description thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] In addition, the drawings are not drawn to a scale of 1:1, and the relative sizes of the respective elements are only drawn exemplarily in the drawings and not necessarily drawn according to the actual scale.

[0032] Figure 1 It is an exploded view of the filter element structure in an embodiment;

[0033] Figure 2 It is an exploded view of the filter element structure in another embodiment;

[0034] Figure 3 It is a cross-sectional view of the filter element structure in an embodiment;

[0035] Figure 4 It is an assembly diagram of the filter bottle cap and the end cap in an embodiment;

[0036] Figure 5 For Figure 4 a partial enlarged view of B in

[0037] Figure 6Schematic structural diagram of an end cap in an embodiment;

[0038] Figure 7 Schematic structural diagram of a filter bottle cap in an embodiment;

[0039] Figure 8 Schematic diagram of the assembly of a filter bottle body and an installation cylinder in an embodiment;

[0040] Figure 9 For Figure 8 Partial enlarged view of C in;

[0041] Figure 10 Schematic structural diagram of a limiting member in an embodiment;

[0042] Figure 11 For Figure 3 Partial enlarged view of A in;

[0043] Figure 12 Schematic structural diagram of a limiting member in another embodiment;

[0044] Figure 13 Schematic structural diagram of a filter bottle cap in another embodiment;

[0045] Figure 14 Schematic diagram of the assembly among a filter bottle cap, a limiting member and a filter bottle body in another embodiment;

[0046] Figure 15 Schematic diagram of the assembly among a filter bottle cap, a limiting member and a filter bottle body in another embodiment;

[0047] Figure 16 Schematic structural diagram of a filter medium in an embodiment;

[0048] Figure 17 Schematic diagram of the structure of an inner cylinder in an embodiment;

[0049] Figure 18 For Figure 16 Partial enlarged view of D in;

[0050] Figure 19 For Figure 17 Partial enlarged view of E in;

[0051] Figure 20 Schematic structural diagram of an inner core in an embodiment;

[0052] Figure 21 For Figure 20 Partial enlarged view of F in.

[0053] Explanation of reference numerals:

[0054] 10. Filter element structure; 100. Filter bottle body; 110. Installation cavity; 120. Open end; 122. Opening; 124. Second thread structure; 1242. Spiral protrusion; 12422. Second thread stop; 130. First limiting part; 140. Second limiting part; 150. First insertion part; 200. Filter bottle cap; 210. Accommodation cavity; 212. First thread structure; 2122. Spiral groove; 21222. First thread stop; 214. Support part; 220. Installation body; 222. Insertion part; 224. Boss; 230. First installation space; 240. First insertion slot; 250. Third connection part; 300. End cap; 310. First installation surface; 320. Second installation surface; 330. Installation hole; 332. Third limiting protrusion; 3322. First limiting surface; 33222. Contact protrusion; 3324. Second limiting surface; 400. Connector; 500. Limiting part; 510. First connection part; 520. Third limiting part; 522. Limiting buckle; 524. First limiting protrusion; 526. Second limiting protrusion; 530. Second connection part; 532. Buckle; 534. Fourth limiting protrusion; 536. Fifth limiting protrusion; 540. Second insertion part; 600. Installation cylinder; 610. Fourth limiting part; 700. Inner core; 710. Filter material; 712. Filter material body; 714. Installation frame; 7142. Fifth limiting part; 716. Seventh limiting part; 7162. Sixth limiting protrusion; 7164. Limiting groove; 720. Inner cylinder; 722. Sixth limiting part; 724. Eighth limiting part; 7242. Seventh limiting protrusion; 7244. Eighth limiting protrusion; 7246. Ninth limiting protrusion; 726. Second installation space; 810. First sealing ring; 820. Second sealing ring; 900. Handle. Detailed implementation manners

[0055] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] Please refer to Figure 1 and Figure 2 The filter element structure 10 in one embodiment includes an inner core 700, a filter bottle body 100, a filter bottle cover 200 and an end cover 300, wherein the filter bottle body 100 includes an open end 120, a mounting cavity 110 is provided in the filter bottle body 100, and an opening 122 communicating with the mounting cavity 110 is provided at the open end 120, the inner core 700 is inserted into the mounting cavity 110 along the opening 122 and installed in the mounting cavity 110, the end cover 300 is inserted into the mounting cavity 110 through the opening 122 to seal the opening 122, the filter bottle cover 200 covers the end cover 300 and is sleeved on the outside of the filter bottle body 100, when the filter element needs to be replaced, the filter bottle cover 200 and the end cover 300 are removed, and the inner core 700 is taken out from the mounting cavity 110.

[0059] Please refer to Figure 3 and Figure 4 The filter bottle cover 200 is provided with a receiving cavity 210, and the filter bottle cover 200 is sleeved on the opening end 120 through the receiving cavity 210. Figure 3 The end cap 300 is used to seal the opening 122 and is connected to the inner wall of the accommodating cavity 210. When the filter bottle cover 200 is installed on the filter bottle body 100, the filter bottle cover 200 pushes the end cap 300 along the opening 122 and inserts it into the installation cavity 110 to seal the opening 122. When the filter element needs to be replaced, the filter bottle cover 200 is removed from the filter bottle body 100. During this process, the filter bottle cover 200 can also be pulled out of the installation cavity 110 to open the opening 122.

[0060] Optionally, the filter bottle cap 200 can move relative to the filter bottle body 100, and is sleeved on the filter bottle body 100 or taken out from the filter bottle body 100 by moving the filter bottle cap 200 relative to the filter bottle body 100. Among them, the way that the filter bottle cap 200 moves relative to the filter bottle body 100 can be: the filter bottle cap 200 moves relative to the filter bottle body 100 in a straight line direction, similar to the way of plugging and unplugging; or the filter bottle cap 200 rotates relative to the filter bottle body 100. For example, the filter bottle cap 200 and the filter bottle body 100 are threadedly connected, and the filter bottle cap 200 is installed on the filter bottle body 100 by screwing.

[0061] During the implementation process, please refer to Figure 3 , when the filter bottle cap 200 is in the first state, at this time, the filter bottle cap 200 moves relative to the open end 120 in the direction of sleeving the open end 120 to drive the end cap 300 to extend into the installation cavity 110 along the opening 122. At this time, the sealing of the opening 122 and the installation of the filter bottle cap 200 are completed.

[0062] Please refer to Figure 2 , when the filter bottle cap 200 is in the second state, the filter bottle cap 200 is capable of moving relative to the open end 120 in the direction of exiting the open end 120 and driving the end cap 300 to exit the installation cavity 110 along the opening 122. At this time, the inner core 700 can be taken out along the installation cavity 110, and the inner core 700 can be cleaned or replaced, which is convenient to use. Moreover, when the inner core 700 reaches the end of its life, it is not necessary to discard the entire filter element structure 10, thus saving the replacement cost.

[0063] Next, the optional installation methods between the end cap 300 and the filter bottle cap 200 will be described in combination with the embodiments.

[0064] Please refer to Figure 3 , in order to facilitate the end cap 300 to seal the opening 122, a second sealing ring 820 is generally provided between the end cap 300 and the inner wall at the opening 122. Since the end cap 300 is connected to the inner wall of the accommodating cavity 210, when the filter bottle cap 200 is installed on the filter bottle body 100 by relative rotation, in order to prevent the filter bottle body 100 from driving the end cap 300 to rotate relative to the accommodating cavity 210 when rotating, so that the friction between the end cap 300 and the second sealing ring 820 and between the second sealing ring 820 and the inner wall of the accommodating cavity 210 is too large, resulting in large disassembly and assembly resistance between the end cap 300 and the filter bottle cap 200. Please refer to Figure 4 and Figure 5 , in this embodiment, the filter element structure 10 further includes a connecting member 400, and the end cap 300 is movably connected to the inner wall of the accommodating cavity 210 through the connecting member 400. Therefore, when the filter bottle cap 200 rotates, it will not drive the end cap 300 to rotate, but only squeeze the end cap 300 along the opening 122 into the installation cavity 110 through the inner wall of the accommodating cavity 210.

[0065] During use, when the filter bottle cap 200 is in the first state, the filter bottle cap 200 moves relative to the open end 120 in the direction of being sleeved on the open end 120 and pushes the end cap 300 along the opening 122 into the installation cavity 110 through the inner wall of the accommodation cavity 210. When the filter bottle cap 200 is in the second state, the filter bottle cap 200 is capable of moving relative to the open end 120 in the direction of exiting the open end 120 and pulling the end cap 300 to exit the installation cavity 110 along the opening 122 through the connecting member 400.

[0066] Please refer to Figure 5 , which shows the assembly manner between the end cap 300 and the filter bottle cap 200 in an embodiment. In the embodiment, the filter bottle cap 200 includes an installation body 220. Please refer to Figure 4 , and the installation body 220 is fixedly arranged on the inner wall of the accommodation cavity 210.

[0067] Specifically, please continue to refer to Figure 6 , the end cap 300 is provided with a first installation surface 310 and a second installation surface 320 which are oppositely arranged. The end cap 300 is also provided with an installation hole 330 penetrating through the first installation surface 310 and the second installation surface 320. The first installation surface 310 is closer to the bottom wall of the accommodation cavity 210 than the second installation surface 320. The installation body 220 is movably inserted into the installation hole 330 from one side of the first installation surface 310. Therefore, when the filter bottle cap 200 rotates, the installation body 220 cannot drive the end cap 300 to rotate, thereby avoiding the frictional force between the end cap 300 and the side wall of the accommodation cavity 210 when the end cap 300 rotates relative to the side wall of the accommodation cavity 210 from hindering the rotation of the filter bottle cap 200.

[0068] Furthermore, please continue to refer to Figure 5 , one end of the connecting member 400 extends into the installation hole 330 along one side of the second installation surface 320 and is connected to the installation body 220. The other end of the connecting member 400 is in limit fit with the inner wall of the installation hole 330 or the second installation surface 320. In this way, the end cap 300 is connected to the inner wall of the accommodation cavity 210 through the installation body 220 and the connecting member 400. It can be understood that at this time, the end cap 300 is indirectly connected to the inner wall of the accommodation cavity 210. And the connecting member 400 can pull the end cap 300 out of the opening 122 and then out of the installation cavity 110 when the filter bottle cap 200 exits the filter bottle body 100.

[0069] Please refer to Figure 5, in this embodiment, the connecting member 400 is in limit fit with the inner wall of the mounting hole 330; specifically, a third limit protrusion 332 is formed on the inner wall of the mounting hole 330, and the third limit protrusion 332 includes a first limit surface 3322 facing the second mounting surface 320. The height of the first limit surface 3322 from the first mounting surface 310 is less than the length of the mounting body 220, and the other end of the connecting member 400 is in limit fit with the first limit surface 3322. In this way, it can be ensured that the mounting body 220 is movably arranged in the mounting hole 330, and when the filter bottle cap 200 is in the second state, the connecting member 400 can pull the end cap 300 out of the accommodating cavity 210.

[0070] When the above-mentioned embodiment is in use, when the filter bottle cap 200 is in the first state, the filter bottle cap 200 moves relative to the open end 120 along the direction of sleeving the open end 120, and through the contact fit between the inner wall of the accommodating cavity 210 and the first mounting surface 310, the end cap 300 is pushed into the mounting cavity 110 along the opening 122.

[0071] When the filter bottle cap 200 is in the second state, the filter bottle cap 200 is capable of moving relative to the open end 120 along the direction of exiting the open end 120, and through the contact fit between the other end of the connecting member 400 and the first limit surface 3322, the end cap 300 is pulled out of the mounting cavity 110 along the opening 122.

[0072] Optionally, please refer to Figure 5 , the connecting member 400 includes a screw. One end of the screw is connected to the mounting body 220, and the other end of the screw is in limit fit with the inner wall of the mounting hole 330. Among them, one end of the screw is a fixed end, and the other end is the screw cap of the screw, and is in limit fit with the inner wall of the mounting cavity 110 through the screw cap. Specifically, please refer to Figure 5 , the screw cap is in limit fit with the first limit surface 3322. When the end cap 300 is installed in the mounting cavity 110, the screw cap and the first limit surface 3322 are spaced apart. When the filter bottle cap 200 is removed from the filter bottle body 100, it will drive the screw cap to move upward to pull the end cap 300 out of the mounting cavity 110.

[0073] In one of the embodiments, please refer to Figure 6 , the first limit surface 3322 is formed with an abutting protrusion 33222 for abutting against the connecting member 400, and the height of the abutting protrusion 33222 from the first mounting surface 310 is less than the length of the mounting body 220. In this way, when the connecting member 400 rotates and exits under the drive of the filter bottle cap 200, the friction between the connecting member 400 and the end cap 300 can be reduced.

[0074] Furthermore, the connecting member 400 further includes a gasket. The gasket is inserted into the screw and arranged on the screw cap, and the abutting protrusion 33222 abuts against the gasket to reduce the friction between the end cap 300 and the gasket.

[0075] Further, on the basis of the foregoing embodiments, in order to ensure the sealing performance of the assembly between the mounting body 220 and the mounting hole 330, please refer to Figure 5 , in this embodiment, the filter element structure 10 further includes a first sealing ring 810, and the first sealing ring 810 is disposed between the inner walls of the mounting body 220 and the mounting hole 330 to seal the mounting hole 330.

[0076] Specifically, please continue to refer to Figure 5 , the mounting body 220 includes an insertion portion 222 and a boss 224, the boss 224 is fixedly provided on the bottom wall of the accommodation cavity 210, the insertion portion 222 is fixedly provided on the boss 224, and the boss 224 protrudes from the circumferential side wall of the insertion portion 222 to form a structure similar to a stepped column; the third limiting protrusion 332 further includes a second limiting surface 3324 opposite to the first limiting surface 3322. When the insertion portion 222 is inserted into the mounting hole 330, the second limiting surface 3324 is spaced from the boss 224 to form a first mounting space 230, and the first sealing ring 810 is sleeved on the insertion portion 222 and is hermetically arranged in the first mounting space 230. In this way, the first sealing ring 810 can seal the gap between the mounting body 220 and the mounting hole 330 to seal the mounting hole 330; in addition, the cooperation of the boss 224 and the second limiting surface 3324 prevents the first sealing ring 810 from falling off. Further, the difference between the height of the abutting protrusion 33222 from the first mounting surface 310 and the length of the mounting body 220 is less than the height of the boss 224. In this way, the boss 224 has a certain squeezing effect on the first sealing ring 810, improving the stability of the first sealing ring 810 in sealing the mounting hole 330.

[0077] Preferably, please refer to Figure 5 , the boss 224 is fixedly provided at the central position of the bottom wall of the accommodation cavity 210. In this way, when the end cap 300 is installed on the mounting body 220, it can be located at the central position of the accommodation cavity 210, which is convenient for the end cap 300 to align with the opening 122.

[0078] Please refer to Figure 4 , the bottom wall of the accommodation cavity 210 forms a support portion 214 for supporting the first mounting surface 310. When the end cap 300 is installed in the installation cavity 110, through the support of the support portion 214, the end cap 300 is prevented from being deformed and broken under pressure. Optionally, the support portion 214 may be a support rib.

[0079] In the foregoing embodiments, it is mentioned that the filter bottle cap 200 and the filter bottle body 100 can be installed by means of linear socket connection or rotational connection. In this embodiment, as one of the installation methods, the inner wall of the accommodation cavity 210 is rotatably connected to the filter bottle body 100.

[0080] The following will specifically elaborate on the optional implementation manners for realizing the rotational connection between the filter cap 200 and the filter bottle body 100 in combination with embodiments.

[0081] Please refer to Figure 2 and Figure 7 , on the inner wall of the accommodating cavity 210, a first thread structure 212 is provided, and on the outer wall of the open end 120, a second thread structure 124 that is helically engaged with the first thread structure 212 is provided. In this way, the filter cap 200 and the filter bottle body 100 are assembled in a helical manner. In addition, when the filter bottle body 100 and the filter cap 200 are assembled by threads, when the filter cap 200 rotates forward or backward, the end cap 300 moves in a straight line. In this way, the torque generated during the helical movement is used to overcome the frictional force generated when the end cap 300 and the filter bottle body 100 move in a straight line, which can make the disassembly and assembly more labor-saving.

[0082] Furthermore, the outer diameter of the filter bottle body 100 is D, and the pitch of the first thread structure 212 is d, where 0.04D ≤ d ≤ 0.08D. In this way, when the pitch of the first thread structure 212 is within this range, it is more labor-saving and convenient to disassemble and assemble when the filter cap 200 rotates.

[0083] In the traditional filter element structure 10, the first thread structure 212 located on the filter cap 200 is provided with a relief groove with a gradually decreasing width. When the second thread structure 124 is helically engaged with the first thread structure 212, the end of the second thread structure 124 will rotate into the relief groove to generate a clamping force to prevent the filter cap 200 from falling off, but it also makes it difficult to disassemble between the filter cap 200 and the filter bottle body 100.

[0084] When the user installs the filter cap 200, on the one hand, it is required that the filter cap 200 does not easily fall off from the filter bottle body 100, and on the other hand, it is required that the disassembly between the filter cap 200 and the filter bottle body 100 is labor-saving. In this way, it is necessary that no clamping force is generated during the cooperation between the first thread structure 212 and the second thread structure 124.

[0085] Please refer to Figure 2 and Figure 7 , in this embodiment, the first thread structure 212 is provided with a first thread stop 21222, and the second thread structure 124 is provided with a second thread stop 12422 that is in limit cooperation with the first thread stop 21222. In this way, when the first thread structure 212 and the second thread structure 124 are in limit cooperation through the first thread stop 21222 and the second thread stop 12422, the first thread structure 212 and the second thread structure 124 cannot continue to rotate to generate a clamping force.

[0086] Optionally, please refer to Figure 2 and Figure 7, the starting end of the second thread structure 124 includes a spiral protrusion 1242, the end face of the spiral protrusion 1242 is the second thread stop 12422, the end of the first thread structure 212 is provided with a spiral groove 2122 for spiral cooperation with the spiral protrusion 1242, and the end face of the spiral groove 2122 is the first thread stop 21222 for limit cooperation with the thread protrusion. Thus, when the filter bottle cap 200 is screwed into the filter bottle body 100, through the limit cooperation between the end face of the spiral protrusion 1242 and the end face of the spiral groove 2122, the filter bottle cap 200 cannot continue to rotate but no clamping force will be generated between the filter bottle cap 200 and the filter bottle body 100. When the filter bottle cap 200 is screwed out, the end face of the spiral protrusion 1242 and the end face of the spiral groove 2122 can be easily separated, and thus the filter bottle cap 200 can be easily screwed out from the filter bottle body 100.

[0087] On the basis of any of the above embodiments, please refer to Figure 8 and Figure 9 , the filter element structure 10 further includes a mounting cylinder 600, and the filter bottle body 100 is inserted into the mounting cylinder 600. The filter bottle cap 200 further includes a handle 900. When disassembling the mounting cylinder 600 and the filter bottle body 100, generally, it is necessary to hold the handle 900 and rotate the filter bottle cap 200 to rotate the filter bottle cap 200 and the filter bottle body 100 out of the mounting cylinder 600. In order to prevent the filter bottle cap 200 from being unscrewed together when disassembling the mounting cylinder 600, resulting in water leakage in the filter bottle body 100, it is necessary to fix the filter bottle cap 200 or limit the rotation range of the filter bottle cap 200.

[0088] Please refer to Figure 3 , the filter element structure 10 further includes a limiting member 500. One end of the limiting member 500 is detachably connected to the filter bottle cap 200, and the other end of the limiting member 500 is in limit cooperation with the filter bottle body 100 to limit the filter bottle cap 200 from separating from the open end 120 and opening the opening 122. Among them, the limiting member 500 is installed on the filter bottle body 100. When the filter bottle cap 200 is sleeved on the filter bottle body 100, the filter bottle cap 200 is restricted on the filter bottle body 100 through the limiting member 500, so as to prevent the filter bottle cap 200 from being disassembled together when disassembling the mounting cylinder 600.

[0089] Among them, the other end of the limiting member 500 is in limit cooperation with the filter bottle body 100, which can be: the limiting member 500 can be directly fixed on the filter bottle body 100 or the limiting member 500 is movable relative to the filter bottle body 100, but through the limit cooperation between the limiting member 500 and the filter bottle body 100, the filter bottle body 100 restricts the moving range of the limiting member 500, and thus indirectly restricts the filter bottle cap 200 from separating from the filter bottle body 100 and opening the opening 122.

[0090] Please refer to Figure 3 and Figure 10, in one embodiment, the limiting member 500 is sleeved on the filter bottle body 100. One end of the limiting member 500 is provided with a first connecting portion 510 for detachably connecting with the filter bottle cap 200. When the filter bottle body 100 is inserted into the installation cylinder 600, the installation cylinder 600 will push the limiting member 500 to move until the first connecting portion 510 is connected to the filter bottle cap 200. Optionally, please refer to Figure 9 , the inner wall of the installation cylinder 600 is provided with a fourth limiting portion 610. When the filter bottle body 100 extends into the installation cylinder 600, the fourth limiting portion 610 is in limiting cooperation with the limiting member 500 and pushes the limiting member 500 to move along so that the first connecting portion 510 can be detachably connected to the filter bottle cap 200.

[0091] To prevent the limiting member 500 from falling off the filter bottle body 100 when the installation cylinder 600 is disassembled, please refer to Figure 11 , the filter bottle body 100 is provided with a first limiting portion 130 and a second limiting portion 140 that are arranged at intervals along the length direction of the filter bottle body 100. The first limiting portion 130 is closer to the filter bottle cap 200 than the second limiting portion 140. The other end of the limiting member 500 is provided with a third limiting portion 520 for limiting cooperation with the first limiting portion 130 and the second limiting portion 140. The limiting member 500 can move between the first limiting portion 130 and the second limiting portion 140 through the limiting cooperation of the third limiting portion 520 with the first limiting portion 130 and the second limiting portion 140. Optionally, the first limiting portion 130 can be a protrusion, and the number of protrusions corresponds to the number of the third limiting portions 520; the second limiting portion 140 is an annular protrusion.

[0092] Specifically, please refer to Figure 11 , when the filter bottle body 100 is installed on the installation cylinder 600, under the push of the installation cylinder 600, the limiting member 500 moves along the direction from the second limiting portion 140 to the first limiting portion 130 until the first connecting portion 510 is detachably connected to the filter bottle cap 200.

[0093] Furthermore, in order to enable the limiting member 500 to be detachably connected to the filter bottle cap 200 when pushed by the installation cylinder 600, it is also necessary to limit the rotation range of the limiting member 500. Based on this, please refer to Figure 10 and Figure 11, in this embodiment, the limiting member 500 is a limiting ring. A third limiting portion 520 is formed on the inner wall of the limiting member 500. The third limiting portion 520 includes a limiting buckle 522, a first limiting protrusion 524, and a second limiting protrusion 526. The first limiting protrusion 524 and the second limiting protrusion 526 are arranged at intervals along the circumferential direction of the limiting member 500. The limiting buckle 522 is arranged between the first limiting protrusion 524 and the second limiting protrusion 526. The limiting buckle 522, the first limiting protrusion 524, and the second limiting protrusion 526 are all installed in a limited manner between the first limiting portion 130 and the second limiting portion 140. The limiting buckle 522 is in limiting cooperation with the first limiting portion 130. In this way, the limiting member 500 cannot be separated from the filter bottle body 100 at the open end 120. In addition, the first limiting protrusion 524 and / or the second limiting protrusion 526 are in limiting cooperation with the second limiting portion 140. In this way, the limiting member 500 cannot be separated from the other end opposite to the open end 120 of the filter bottle body 100. Furthermore, the limiting member 500 is restricted on the filter bottle body 100 and will not fall off. Among them, the first limiting protrusion 524 and the second limiting protrusion 526 protrude along the inner wall of the limiting member 500. When the limiting member 500 is separated from the filter bottle cap 200, the filter bottle cap 200 just falls to overlap with the second limiting portion 140 for limiting cooperation.

[0094] Furthermore, the first limiting portion 130 is installed in a limited manner between the first limiting protrusion 524 and the second limiting protrusion 526. In this way, the limiting cooperation between the first limiting protrusion 524 and the first limiting portion 130 and the limiting cooperation between the second limiting protrusion 526 and the first limiting portion 130 limit the rotation range of the limiting member 500. Furthermore, the limiting member 500 can only rotate in this area. In this way, it is convenient for the detachable connection between the limiting member 500 and the filter bottle cap 200. In addition, the limiting cooperation between the first limiting protrusion 524 and the first limiting portion 130 and the limiting cooperation between the second limiting protrusion 526 and the first limiting portion 130 also limit the rotation range of the limiting member 500, that is, the rotation range of the filter bottle cap 200 can be limited. Even when the installation cylinder 600 is screwed out from the filter bottle body 100, the filter bottle cap 200 will not be screwed out. Thus, the filter bottle body 100 and the filter bottle cap 200 can be separated from the installation cylinder 600 together, which is convenient for subsequent separate replacement or maintenance of the inner core 700.

[0095] Optionally, the first connecting portion 510 is a first plugging protrusion, and the filter bottle cap 200 is provided with a first plugging groove 240 that is plugged and matched with the first plugging protrusion.

[0096] Please refer to Figure 10, the first insertion protrusion is in the shape of an isosceles triangle, the first insertion groove 240 is trapezoidal, there are four first insertion protrusions which are arranged at intervals along the circumferential direction of the limiting member 500, there are four groups of first insertion grooves 240 which are arranged at intervals along the circumferential direction of the filter bottle cap 200, each group includes three first insertion grooves 240 and the three first insertion grooves 240 are arranged at a certain interval along the circumferential direction of the filter bottle cap 200, and the specific interval is designed according to needs. The first insertion protrusion is inserted and matched with the first insertion groove 240 in the middle position of a single group of first insertion grooves 240 during assembly. Optionally, the longitudinal section of the first insertion protrusion is an isosceles triangle, and the base angle is between 55° and 65°. Within this range, it is convenient for the disassembly and assembly between the limiting member 500 and the filter bottle cap 200. The height of the first insertion protrusion is 3 mm to 5 mm. When the first insertion protrusion is matched with the first insertion groove 240, the torque of the screw-on of the water outlet end of the filter element is less than the maximum force for the elastic deformation of the first insertion protrusion, so as to realize that there is no relative rotation between the filter bottle body 100 and the filter bottle cap 200.

[0097] Furthermore, the distance between the first limiting protrusion 524 and the second limiting protrusion 526 is larger than the length of the first limiting portion 130, and the difference between the distance between the first limiting protrusion 524 and the second limiting protrusion 526 and the length of the first limiting portion 130 is 2 to 3 times the distance between two adjacent first insertion grooves 240 in a single group of first insertion grooves 240. In this way, it can be ensured that the first insertion protrusion has a certain moving distance when inserted into the first insertion groove 240, and the top sharp angle of the first insertion protrusion can be introduced into the first insertion groove 240 along the hypotenuse of the first insertion groove 240 within the range of the first insertion groove 240, which is convenient for the assembly between the two.

[0098] In another embodiment, please refer to Figure 12 and Figure 14 , one end of the limiting member 500 is provided with a second connecting portion 530, the filter bottle cap 200 is provided with a third connecting portion 250 which is in snap-fit connection with the second connecting portion 530, and the limiting member 500 is detachably connected with the filter bottle cap 200 through the snap-fit connection between the second connecting portion 530 and the third connecting portion 250.

[0099] Optionally, please continue to refer to Figure 12 , the limiting member 500 is a limiting ring, the second connecting portion 530 is arranged on the inner wall of the limiting ring, the second connecting portion 530 includes a buckle 532, a fourth limiting protrusion 534 and a fifth limiting protrusion 536, the fourth limiting protrusion 534 and the fifth limiting protrusion 536 are arranged at intervals along the circumferential direction of the limiting member 500, and the buckle 532 is arranged between the fourth limiting protrusion 534 and the fifth limiting protrusion 536. The third connecting portion 250 is a clamping protrusion, and the buckle 532 is in snap-fit connection with the clamping protrusion. In this way, when the filter bottle cap 200 is installed on the filter bottle body 100, the filter bottle cap 200 can be connected with the limiting member 500 through the snap-fit connection between the clamping protrusion and the buckle 532.

[0100] Further, the clamping protrusion is clamped and installed between the fourth limiting protrusion 534 and the fifth limiting protrusion 536. In this way, when the clamping protrusion is in limiting cooperation with the fourth limiting protrusion 534 and the clamping protrusion is in limiting cooperation with the fifth limiting protrusion 536, the rotation range of the limiting member 500 is defined. Furthermore, the limiting member 500 can limit the rotation range of the filter bottle cap 200. In this way, on the one hand, it is convenient for the clamping connection and installation between the clamping protrusion and the buckle; on the other hand, even when the installation cylinder 600 is screwed out from the filter bottle body 100, the filter bottle cap 200 will not be screwed out. Thus, the filter bottle body 100 and the filter bottle cap 200 are separated from the installation cylinder 600 together, which is convenient for subsequent separate replacement or maintenance of the filter element.

[0101] Further, please refer to Figures 13 to 15 , a first insertion part 150 is provided on the outer wall of the filter bottle body 100, a second insertion part 540 is provided at the other end of the limiting member 500, and the other end of the limiting member 500 is in limiting cooperation with the filter bottle body 100 through the insertion cooperation of the first insertion part 150 and the second insertion part 540. In this way, through the insertion cooperation of the first insertion part 150 and the second insertion part 540, it is avoided that the limiting member 500 falls off along the other end of the filter bottle body 100 opposite to the inlet end, and further, the limiting member 500 is restricted on the filter bottle body 100, thereby restricting the filter bottle body 100 from opening the opening 122 by separating along the opening end 120.

[0102] Optionally, the first insertion part 150 can be a second insertion protrusion, and the second insertion part 540 can be a second insertion groove.

[0103] On the basis of any of the above embodiments, please refer to Figure 16 and Figure 17 , the filter element structure 10 further includes an inner core 700. The inner core 700 includes a filter medium 710 and an inner cylinder 720. The filter medium 710 is detachably installed inside the inner cylinder 720, and the inner cylinder 720 is detachably installed inside the installation cavity 110. In this way, during use, since the inner cylinder 720 is detachably installed inside the installation cavity 110, when the filter medium 710 has been used for a certain period of time, the inner cylinder 720 is removed from the installation cavity 110. Since the filter medium 710 is detachably connected to the inner cylinder 720, in this way, the filter medium 710 is directly removed from the inner cylinder 720 for cleaning, and after cleaning, it is reinstalled into the inner cylinder 720, and then the inner cylinder 720 is installed inside the installation cavity 110, thereby avoiding replacing the entire inner core 700 including the filter medium 710 and reducing the replacement cost.

[0104] Specifically, please refer to Figure 16 , Figure 18 and Figure 19, the filter medium 710 includes a filter medium body 712 and a mounting frame 714 fixedly connected to the filter medium body 712. The mounting frame 714 is provided with a fifth limiting portion 7142, and the inner wall of the inner cylinder 720 is provided with a sixth limiting portion 722. When the filter medium body 712 is inserted into the inner cylinder 720, the mounting frame 714 is limited and matched with the sixth limiting portion 722 through the fifth limiting portion 7142, so that the filter medium 710 is limited and installed in the inner cylinder 720.

[0105] Optionally, please refer to Figure 18 and Figure 19 , in one embodiment, the fifth limiting portion 7142 is a limiting notch, and the inner wall of the inner cylinder 720 at the inlet and outlet of the inner cylinder 720 is provided with a limiting step that is limited and matched with the limiting notch. The sixth limiting portion 722 is a limiting step. When the filter medium body 712 is inserted into the inner cylinder 720, the limiting step is limited and matched with the limiting notch. In this way, through the cooperation between the limiting step and the limiting notch, the filter medium 710 can be erected on the inner cylinder 720. Among them, the stepped shape of the limiting notch and the limiting step just match.

[0106] Furthermore, when the filter medium 710 is erected on the limiting step at the inlet and outlet of the inner cylinder 720, please refer to Figure 18 , the mounting frame 714 is further provided with a seventh limiting portion 716, and the seventh limiting portion 716 and the fifth limiting portion 7142 are arranged at intervals along the insertion direction of the mounting frame 714; please refer to Figure 19 , the inner wall of the inner cylinder 720 is further provided with an eighth limiting portion 724, and the eighth limiting portion 724 and the sixth limiting portion 722 are arranged at intervals along the depth direction of the inner cylinder 720; when the fifth limiting portion 7142 and the sixth limiting portion 722 are limited and matched, the mounting frame 714 is limited and matched with the eighth limiting portion 724 through the seventh limiting portion 716 to limit the relative rotation of the mounting frame 714 with respect to the inner cylinder 720. Specifically, the timing of the limiting and matching between the seventh limiting portion 716 and the eighth limiting portion 724 can be: when the limiting and matching between the limiting step and the limiting notch is passed, the seventh limiting portion 716 is immediately limited and matched with the eighth limiting portion 724; or when the limiting and matching between the limiting step and the limiting notch is passed, by driving the relative rotation between the filter medium 710 and the inner cylinder 720, when the filter medium 710 or the inner cylinder 720 rotates to a preset position, the seventh limiting portion 716 is limited and matched with the eighth limiting portion 724.

[0107] Optionally, please refer to Figure 18 , in one embodiment, the seventh limiting portion 716 includes a sixth limiting protrusion 7162, and the sixth limiting protrusion 7162 is provided with a limiting groove 7164; please refer to Figure 19, the eighth limiting part 724 includes a seventh limiting protrusion 7242, an eighth limiting protrusion 7244 and a ninth limiting protrusion 7246. The seventh limiting protrusion 7242 extends along the insertion direction of the inner cylinder 720. The eighth limiting protrusion 7244 extends along the circumferential direction of the inner cylinder 720. The seventh limiting protrusion 7242 and the eighth limiting protrusion 7244 are connected and enclose to form a second installation space 726. The ninth limiting protrusion 7246 is arranged in the second installation space 726.

[0108] Please refer to Figure 20 and Figure 21 , when the fifth limiting part 7142 and the sixth limiting part 722 are in limiting cooperation, the mounting frame 714 and the inner cylinder 720 can relatively rotate so that the sixth limiting protrusion 7162 is limitedly installed in the second installation space 726 and is in limiting cooperation with the seventh limiting protrusion 7242 and the eighth limiting protrusion 7244, and the ninth limiting protrusion 7246 is limitedly installed in the limiting groove 7164. In this way, relative rotation will not occur between the mounting frame 714 and the inner cylinder 720, and thus the filter material 710 can be fixedly installed in the inner cylinder 720. When the filter material 710 needs to be cleaned, drive the mounting frame 714 and the inner cylinder 720 to rotate in the opposite direction, so that the ninth limiting protrusion 7246 disengages from the limiting groove 7164, and the sixth limiting protrusion 7162 leaves the second installation space 726. Then, the mounting frame 714 can be pulled out of the inner cylinder 720.

[0109] In addition, an embodiment further relates to a water purifier, including the filter element structure 10 in any of the above embodiments.

[0110] When the above water purifier is in use, insert the filter bottle body 100 into the installation cylinder 600. At this time, under the push of the installation cylinder 600, the limiting member 500 moves along the direction from the second limiting part 140 to the first limiting part 130 until the first connecting part 510 is detachably connected to the filter bottle cap 200. Furthermore, on the one hand, the filter bottle cap 200 is restricted on the filter bottle body 100 by the limiting member 500, and on the other hand, the limiting member 500 is restricted on the filter bottle body 100 by the second limiting part 140 and the first limiting part 130. In this way, it can be avoided that when the installation cylinder 600 is screwed, the filter bottle cap 200 is screwed off from the filter bottle body 100 to open the opening 122, causing a water leakage problem.

[0111] In the present invention, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0112] In the present invention, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0113] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0114] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0115] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

1. A filter element structure, characterized in that, Comprising: An installation cylinder, a filter bottle cap and a filter bottle body. The filter bottle body is inserted into the installation cylinder. The filter bottle body includes an open end provided with an opening. The filter bottle cap is sleeved on the open end. The filter bottle body is provided with a first limiting portion and a second limiting portion which are arranged at intervals along the length direction of the filter bottle body. The first limiting portion and the second limiting portion are arranged at intervals from the filter bottle cap, and the first limiting portion is closer to the filter bottle cap than the second limiting portion; And A limiting member. One end of the limiting member is provided with a first connecting portion, and the other end of the limiting member is provided with a third limiting portion for limiting and cooperating with the first limiting portion and the second limiting portion. The limiting member can move between the first limiting portion and the second limiting portion through the limiting cooperation of the third limiting portion with the first limiting portion and the second limiting portion. When the limiting member moves along the direction from the second limiting portion to the first limiting portion, the first connecting portion is detachably connected to the filter bottle cap to limit the separation of the filter bottle cap from the open end and open the opening; The limiting member is a limiting ring sleeved on the filter bottle body. The inner wall of the limiting ring forms the third limiting portion. The third limiting portion includes a limiting buckle, a first limiting protrusion and a second limiting protrusion. The first limiting protrusion and the second limiting protrusion are arranged at intervals along the circumferential direction of the limiting ring. The limiting buckle, the first limiting protrusion and the second limiting protrusion are all limited and installed between the first limiting portion and the second limiting portion; The limiting buckle is in limiting cooperation with the first limiting portion, the first limiting protrusion and / or the second limiting protrusion is in limiting cooperation with the second limiting portion, and the first limiting portion is limited and installed between the first limiting protrusion and the second limiting protrusion; The first connecting portion is a plugging protrusion, and the filter bottle cap is provided with a plugging groove for plugging and cooperating with the plugging protrusion; The inner wall of the installation cylinder is provided with a fourth limiting portion. When the filter bottle body extends into the installation cylinder, the fourth limiting portion is in limiting cooperation with the limiting ring and pushes the limiting ring to move along the direction from the second limiting portion to the first limiting portion so that the first connecting portion is detachably connected to the filter bottle cap.

2. The filter element structure according to claim 1, characterized in that It further includes an end cap. An installation cavity is arranged in the filter bottle body. The opening is communicated with the installation cavity. The filter bottle cap is provided with a receiving cavity. The filter bottle cap is sleeved on the open end through the receiving cavity. The end cap is used for plugging the opening and is connected to the inner wall of the receiving cavity; Wherein, the filter bottle cap can move relative to the open end. The filter bottle cap has a first state of moving relative to the open end along the direction of sleeving on the open end to drive the end cap to extend into the installation cavity along the opening, and a second state of moving relative to the open end along the direction of withdrawing from the open end and driving the end cap to withdraw from the installation cavity along the opening.

3. The filter element structure according to claim 2, wherein It further includes a connecting member, and the end cap is movably connected to the inner wall of the installation cavity through the connecting member; when the filter bottle cap is in the first state, the filter bottle cap moves relative to the open end along the direction of sleeving the open end and pushes the end cap to extend into the installation cavity along the opening through the inner wall of the accommodating cavity; when the filter bottle cap is in the second state, the filter bottle cap moves relative to the open end along the direction of exiting the open end and pulls the end cap to exit the installation cavity along the opening through the connecting member.

4. The filter element structure according to claim 3, characterized in that The inner wall of the accommodating cavity is rotatably connected to the filter bottle body.

5. The filter element structure according to claim 3, characterized in that, The filter bottle cap includes a mounting body, the mounting body is fixed on the inner wall of the accommodating cavity, the end cap is provided with a first mounting surface and a second mounting surface arranged oppositely, the end cap is further provided with a mounting hole penetrating through the first mounting surface and the second mounting surface, and the first mounting surface is closer to the bottom wall of the accommodating cavity than the second mounting surface; The mounting body is movably inserted into the mounting hole from one side of the first mounting surface, one end of the connecting member extends into the mounting hole along one side of the second mounting surface and is connected to the mounting body, and the other end of the connecting member is in limit fit with the inner wall of the mounting hole or the second mounting surface.

6. The filter element structure according to claim 5, wherein, The bottom wall of the accommodating cavity forms a supporting portion for supporting the first mounting surface.

7. The filter element structure according to claim 5, wherein A third limiting protrusion is formed on the inner wall of the mounting hole, the third limiting protrusion includes a first limiting surface facing the second mounting surface, the height of the first limiting surface from the first mounting surface is less than the length of the mounting body, and the other end of the connecting member is in limit fit with the first limiting surface; When the filter bottle cap is in the first state, the filter bottle cap moves relative to the open end along the direction of sleeving the open end and pushes the end cap to extend into the installation cavity along the opening through the contact fit between the inner wall of the accommodating cavity and the first mounting surface; When the filter bottle cap is in the second state, the filter bottle cap moves relative to the open end along the direction of exiting the open end and pulls the end cap to exit the installation cavity along the opening through the contact fit between the other end of the connecting member and the first limiting surface.

8. A water purifier, characterized in that, It includes the filter element structure according to any one of claims 1 to 7.

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