Composite filter element structure and water purifier

Abstract

The present invention provides a composite filter element structure and a water purifier, comprising an outer shell with a built-in accommodating cavity, the outer shell comprising a first opening end, the first opening end being connected to the accommodating cavity; an inner shell, arranged inside the accommodating cavity, a first accommodating space being arranged between the inner shell and the outer shell, a first filter element assembly being arranged in the first accommodating space, suitable for separating the first accommodating space, a second opening end on the inner shell being arranged inside the first opening end, a first water inlet and a first water outlet being respectively formed along both sides of the first filter element assembly, a first switch structure being arranged between the first opening end and the second opening end; an inner tube being arranged inside the inner shell, a cavity being arranged inside, a second filter element assembly being arranged on the inner tube, and a second accommodating space being arranged between the inner tube and the inner shell.

Description

Technical Field

[0001] The invention relates to the technical field of filtering and purifying water, and in particular to a composite filter element structure and a water purifier. Background Art

[0002] With the improvement of living standards, people pay more and more attention to the safety of water quality. The water quality provided by the water plant can no longer meet people's living needs. More and more people choose to install water purifiers at home so that they can drink filtered water with less impurities.

[0003] Under the existing technology, water purifiers are usually equipped with three or more filter elements with different filtering functions, such as RO filter element, carbon element, PAC filter element, etc. Among them, RO filter element is a reverse osmosis filter element, which can filter inorganic salts, organic matter, heavy metal ions and other harmful substances in the water; PAC filter element is used as a pre-filter to filter large particles such as mud and sand in the water, and carbon core can effectively filter odors in the water and improve the taste. Through the setting of different filter elements and connecting them through waterways, effective filtration of water sources can be achieved.

[0004] However, the setting of multiple filter cartridges not only takes up a large space in the water purifier, but also has multiple connecting pipes, which increases the risk of damage and easily causes problems such as water leakage, making installation and maintenance more difficult. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the arrangement of multiple filter cartridges in a water purifier in the prior art occupies a large space, has a high risk of damage, and increases the difficulty of maintenance, thereby providing a composite filter cartridge structure and a water purifier.

[0006] The present invention provides a composite filter element structure, comprising:

[0007] An outer shell having a built-in accommodating cavity, the outer shell comprising a first opening end, the first opening end being in communication with the accommodating cavity;

[0008] An inner shell is arranged inside the accommodating cavity, and a first accommodating space is arranged between the inner shell and the outer shell, a first filter element assembly is arranged in the first accommodating space, and the first accommodating space is separated, a second opening end on the inner shell is arranged inside the first opening end, and a first water inlet and a first water outlet are respectively formed along both sides of the first filter element assembly, and a first switch structure is arranged between the first opening end and the second opening end, and the first water inlet and the first water outlet are controlled to be opened and closed;

[0009] An inner tube is arranged inside the inner shell body, and a cavity is arranged inside, on which a second filter element assembly is arranged, a second accommodating space is arranged between the inner tube and the inner shell body, a third opening end on the inner tube is arranged on the inner side of the second opening end, and a second water inlet is formed between the inner tube and the second opening end, and a second switch structure is provided, which is suitable for controlling the opening and closing of the second water inlet, the second water inlet is connected to the second accommodating space, the cavity is connected to the third opening end, and a second water outlet and a third switch structure are provided on the third opening end, and the third switch structure is suitable for controlling the opening and closing of the second water outlet.

[0010] The first filter element assembly comprises: a first filter element, which is arranged around the inner shell and spaced apart from the inner shell and the outer shell, and is suitable for filtering the liquid from the first water inlet and directing it to the first water outlet;

[0011] The first end cover includes a first front end cover and a first rear end cover, which are respectively arranged at two ends of the first filter element and are sealed to the first filter element. The first front end cover is arranged adjacent to the first opening end.

[0012] A limiting shoulder is arranged on the peripheral side surface of the inner shell, and the limiting shoulder is sealed and fixed to the first rear end cover.

[0013] A plurality of first protrusions are arranged along the circumference of the inner shell.

[0014] The first filter element is provided with an inner edge frame, and the inner edge frame is provided with a second protrusion protruding toward one side of the inner shell body, and the second protrusion is arranged alternately with the first protrusion.

[0015] The inner shell is integrally formed.

[0016] The inner tube includes: a central tube including a third open end, and spaced apart from the inner shell and constituting the second accommodation space;

[0017] The second filter element assembly is suitable for extending axially along the central tube, with one end connected to the central tube and the other end fixedly connected to the inner wall of the inner shell body facing away from the open end. The second filter element assembly is suitable for filtering the liquid in the second containing space and transporting it to the cavity.

[0018] The second filter element assembly includes:

[0019] A second filter element, disposed between the cavity and the second accommodating space and spaced apart from the inner shell, adapted to filter the liquid in the second accommodating space and guide the liquid to the second water outlet;

[0020] The second end cover includes a second front end cover and a second rear end cover, which are respectively arranged at both ends of the second filter element and sealedly connected to the second filter element. The second front end cover abuts against the central tube, and the second rear end cover is fixedly connected to the inner wall of the outer shell on the side facing away from the open end.

[0021] A plurality of radial protrusions are provided on the outer sides of the first end cover and the second end cover along the circumferential direction, and the protrusions abut against the inner wall of the outer shell.

[0022] The first switch structure is tubular in shape, and its inner diameter is stepped. It has an elastic member built in and is sealed and connected to the first filter element assembly. It has the ability to move in the direction away from the first opening end under the action of an external force and open the first water inlet to pass water, and to abut against the inner wall of the first opening end and close the first water inlet to stop water.

[0023] The second switch structure is tubularly sleeved on the inner side of the first switch structure, has an elastic member built in, and is sealed and connected to the outer side of the third opening end. It has the ability to move in the direction away from the first opening end under the action of an external force, and open the first water outlet and the second water inlet to allow water to pass, and to abut against the inner wall of the first switch structure and the outer wall of the inner tube respectively, and close the first water outlet and the second water inlet to stop water.

[0024] The third switch structure includes a valve core, the outer end of the valve core is sleeved with a pressure cover, the pressure cover is fixed to the outer end of the second water outlet, and is suitable for limiting the valve core. The other end of the valve core is sleeved with an elastic member and extends into the second water outlet to abut against the shoulder structure arranged in the second water outlet.

[0025] The first filter element is a PAC filter element, and the second filter element is a carbon rod filter element.

[0026] The outer shell, the inner shell and the inner tube are coaxially arranged.

[0027] The outer shell includes a filter bottle body and a filter bottle cover. The first opening end is arranged at one end of the filter bottle body. The filter bottle cover is fixedly arranged at the other end of the filter bottle body facing away from the first opening end. A filter element handle is connected to the filter bottle cover.

[0028] The filter bottle body and the filter bottle cover, as well as the pressure cover and the outer end of the second water outlet are fixedly connected through ultrasound.

[0029] The present invention also provides a water purifier, comprising the above-mentioned composite filter element structure.

[0030] The water purifier also includes a waterway plate, which is arranged in cooperation with the composite filter element structure and is provided with a waterway conversion joint suitable for abutting with the first switch structure, the second switch structure, and the third switch structure and isolating the first water inlet, the first water outlet and the second water inlet.

[0031] The technical solution of the present invention has the following advantages:

[0032] 1. The composite filter element structure provided by the present invention comprises: an outer shell having a built-in accommodating cavity, the outer shell comprising a first open end, the first open end being communicated with the accommodating cavity; an inner shell arranged inside the accommodating cavity, a first accommodating space being arranged between the inner shell and the outer shell, a first filter element assembly being arranged in the first accommodating space, suitable for separating the first accommodating space, a second open end on the inner shell being arranged inside the first open end, and a first water inlet and a first water outlet being respectively formed along both sides of the first filter element assembly, a first switch structure being arranged between the first open end and the second open end, suitable for controlling the first water inlet and the first water outlet A water outlet opening and closing; an inner tube, arranged inside the inner shell, with a cavity arranged inside, on which a second filter element assembly is arranged, a second accommodating space is arranged between the inner tube and the inner shell, a third opening end on the inner tube is arranged on the inner side of the second opening end, and a second water inlet is formed between the second opening end, and a second switch structure is provided, which is suitable for controlling the opening and closing of the second water inlet, the second water inlet is connected to the second accommodating space, the cavity is connected to the third opening end, and a second water outlet and a third switch structure are provided on the third opening end, and the third switch structure is suitable for controlling the opening and closing of the second water outlet.

[0033] The composite filter element structure has a three-layer structure of an outer shell, an inner shell and an inner tube. The first filter element assembly is arranged between the outer shell and the inner shell to separate the first storage space, and a first water inlet and a first water outlet are provided, so that external water can be filtered from the first water inlet to the first filter element assembly, and then flow out from the first water outlet, forming a first complete filtering water path. At the same time, a second storage space is arranged between the inner shell and the inner tube, and is connected to the second water inlet, and a second filter element assembly is arranged on the inner tube, and a cavity connected to the second water outlet is arranged inside, so that external water can enter the second storage space from the second water inlet, pass through the second filter element assembly, and flow out from the second water outlet, forming a second complete filtering water path.

[0034] Two sets of filter element components are arranged in a composite filter element structure to form two filtering water paths, so that two filtering functions of different types can be realized in one filter element, and an integrated setting of multiple filter elements can be realized. This setting reduces the connection of pipelines and reduces the occurrence of problems such as pipeline leakage. Secondly, installation and maintenance only require the installation or replacement of one filter element, and there is no need to disassemble multiple filter elements before installation, which is convenient for maintenance personnel to install and maintain. At the same time, it reduces the volume of the filter element, which is convenient for the transportation of the filter element and the use of the water purifier.

[0035] 2. In the composite filter element structure provided by the present invention, a limiting shoulder is provided on the peripheral side surface of the inner shell, and the limiting shoulder is sealed and fixed to the first rear end cover.

[0036] On the one hand, a limiting shoulder is provided, and the first filter element assembly can be limited or fixed by cooperating with the inner side surface of the first opening end of the outer shell and the limiting shoulder of the inner shell. At the same time, such a setting facilitates the assembly of the composite filter element structure. The first filter element assembly can be installed in the outer shell first, and then the inner shell is assembled, which facilitates the smooth assembly process. On the other hand, the limiting shoulder is sealed and fixed to the first rear end cover. At the same time, the inner side surface of the first opening end of the outer shell abuts against the first front end cover. Such a setting effectively realizes the isolation between the branch water channels on both sides of the first sealing assembly, thereby avoiding the occurrence of water cross-talk between the branch water channels.

[0037] 3. The composite filter element structure provided by the present invention has a plurality of first protrusions arranged along the circumference of the inner shell.

[0038] Since the two sides of the inner shell have cavities for accommodating different water flows and need to withstand the structural deformation caused by the water pressure difference, by arranging the first protrusion on the inner shell, the strength of the inner shell can be effectively enhanced, the resistance to deformation can be increased, the working stability of the inner shell can be improved, the service life of the filter element can be increased, and water cross-linking between branch waterways can be avoided.

[0039] 4. In the composite filter element structure provided by the present invention, the first filter element is provided with an inner edge frame, the inner edge frame is provided with a second protrusion protruding toward one side of the inner shell body, and the second protrusion is arranged alternately with the first protrusion.

[0040] The second protrusion on the inner edge skeleton is staggered with the first protrusion. On the one hand, the structural strength of the first filter element and the inner shell is increased to avoid deformation due to pressure difference, while improving the working stability of the inner shell and the first filter element and increasing the service life of the filter element. On the other hand, the staggered second protrusion and the first protrusion prevent water from flowing into the water-containing space while ensuring that the water flow in the water-containing space can flow freely, thereby reducing the impact force of the water flow and avoiding excessive water pressure on the local water-facing side of the filter element parts. The staggered transverse ribs are conducive to guiding the water flow in different directions, distributing the water pressure to more force-bearing structures, and improving the load-bearing capacity of the filter element.

[0041] 5. In the composite filter element structure provided by the present invention, the outer sides of the first end cover and the second end cover are provided with a plurality of radial protrusions along the circumferential direction, and the protrusions abut against the inner wall of the outer shell.

[0042] On the one hand, such a configuration can achieve effective support for the first accommodating space and the second accommodating space, ensuring the stability of the distance between the first filter element assembly and the inner shell body and the outer shell body, as well as the distance between the second filter element assembly and the inner shell body; on the other hand, the gap between adjacent protrusions can make the water path in the first accommodating space and the second accommodating space unobstructed, ensuring that the water can flow in the preset direction.

[0043] 6. In the composite filter element structure provided by the present invention, the filter bottle body and the filter bottle cover, as well as the pressure cover and the outer end of the second water outlet are fixedly connected by ultrasound.

[0044] Since the filter element is used to treat the source of drinking water for the human body, the material is mostly plastic parts, which can be softened and welded by ultrasound through vibration and pressure. At the same time, ultrasonic fixation has a series of advantages such as less time, energy saving and high efficiency, high degree of automation, good sealing and waterproof effect, etc. It is more stable than gluing and is not prone to glue overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A schematic diagram of the internal structure of a composite filter element structure provided in an embodiment of the present invention;

[0047] Figure 2 for Figure 1 An enlarged view of part A of the composite filter element structure shown;

[0048] Figure 3 for Figure 2 A structural diagram of an enlarged view of part A of the composite filter element structure shown;

[0049] Figure 4 for Figure 1 A schematic diagram of the outer shell structure of the composite filter element structure shown;

[0050] Figure 5 for Figure 1 The schematic diagram of the internal water flow of the composite filter structure shown;

[0051] Figure 6 for Figure 1 The schematic diagram of the internal water flow of the local structure of the composite filter element structure shown;

[0052] Figure 7 for Figure 1 A schematic diagram of the internal water flow of another local structure of the composite filter element structure shown;

[0053] Figure 8 for Figure 4 An exploded view of the outer shell structure of the composite filter element structure shown;

[0054] Fig. 9 for Figure 1 A schematic structural diagram of a first filter element assembly of the composite filter element structure shown;

[0055] Fig.10 for Fig. 9 An exploded view of the structure of the first filter element assembly of the composite filter element structure shown;

[0056] Fig.11 for Figure 1 The structural exploded diagram of the central tube of the composite filter element structure and the third switch structure shown;

[0057] Fig.12 for Figure 1 A schematic structural diagram of a second filter element assembly of the composite filter element structure shown;

[0058] Fig.13 for Fig.12 An exploded view of the structure of the second filter element assembly of the composite filter element structure shown;

[0059] Fig.14 for Figure 1 A partial structural schematic diagram of the second switch structure and the third switch structure of the composite filter element structure shown;

[0060] Description of reference numerals:

[0061] 1-outer shell; 2-inner shell; 3-inner tube; 4-first accommodating space; 5-first filter element assembly; 6-second accommodating space; 7-cavity; 8-first switch structure; 9-second switch structure; 10-third switch structure; 12-first opening end; 13-first water inlet; 14-first water outlet; 15-filter bottle body; 16-filter bottle cover; 17-filter element handle; 21-second opening end; 22-second water inlet; 2 3-limiting shoulder; 24-first protrusion; 31-third opening end; 32-second water outlet; 33-center tube; 34-second filter element assembly; 341-second filter element; 342-second front end cover; 343-second rear end cover; 51-first filter element; 511-inner edge frame; 512-second protrusion; 52-first front end cover; 53-first rear end cover; 101-valve core; 102-pressure cover. DETAILED DESCRIPTION

[0062] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0066] like Figure 1 - Fig.14As shown, a composite filter element structure includes: an outer shell 1, an inner shell 2 and an inner tube 3.

[0067] The outer shell 1 has a built-in accommodating cavity, and the outer shell 1 includes a first opening end 12, and the first opening end 12 is connected to the accommodating cavity;

[0068] The inner shell body 2 is arranged inside the accommodating cavity, and a first accommodating space 4 is arranged between the inner shell body 1. A first filter element assembly 5 is arranged in the first accommodating space 4, which can separate the first accommodating space 4. The second opening end 21 on the inner shell body 2 is arranged on the inner side of the first opening end 12, and a first water inlet 13 and a first water outlet 14 are respectively formed along both sides of the first filter element assembly 5. A first switch structure 8 is arranged between the first opening end 12 and the second opening end 21, which can control the opening and closing of the first water inlet 13 and the first water outlet 14.

[0069] The inner tube 3 is arranged inside the inner shell 2, and a cavity 7 is arranged inside, on which a second filter element assembly 34 is arranged, a second accommodating space 6 is arranged between the inner tube 3 and the inner shell 2, the third opening end 31 on the inner tube 3 is arranged on the inner side of the second opening end 21, and a second water inlet 22 is formed between the second opening end 21, and a second switch structure 9 is provided to control the opening and closing of the second water inlet 22, the second water inlet 22 is connected to the second accommodating space 6, the cavity 7 is connected to the third opening end 31, and a second water outlet 32 ​​and a third switch structure 10 are provided on the third opening end 31, and the third switch structure 10 can control the opening and closing of the second water outlet 32.

[0070] like Figure 1 - Figure 6 As shown, the composite filter element structure has a three-layer structure of an outer shell 1, an inner shell 2 and an inner tube 3. The first filter element assembly 5 is arranged between the outer shell 1 and the inner shell 2 to separate the first accommodating space 4, and a first water inlet 13 and a first water outlet 14 are provided, so that external water can be filtered from the first water inlet 13 to the first filter element assembly 5, and then flow out from the first water outlet 14, forming a first complete filtering water path. At the same time, a second accommodating space 6 is arranged between the inner shell 2 and the inner tube 3, and is connected to the second water inlet 22, and a second filter element assembly 34 is arranged on the inner tube 3, and a cavity 7 connected to the second water outlet 32 ​​is arranged inside, so that external water can enter the second accommodating space 6 from the second water inlet 22, pass through the second filter element assembly 34, and flow out from the second water outlet 32, forming a second complete filtering water path.

[0071] Two sets of filter element components are arranged in a composite filter element structure to form two filtering water paths, so that two filtering functions of different types can be realized in one filter element, and an integrated setting of multiple filter elements can be realized. This setting reduces the connection of pipelines and reduces the occurrence of problems such as pipeline leakage. Secondly, installation and maintenance only require the installation or replacement of one filter element, and there is no need to disassemble multiple filter elements before installation, which is convenient for maintenance personnel to install and maintain. At the same time, it reduces the volume of the filter element, which is convenient for the transportation of the filter element and the use of the water purifier.

[0072] On the one hand, a limiting shoulder 23 is provided, and the first filter element assembly 5 can be limited or fixed by cooperating with the inner side surface of the first opening end 12 of the outer shell 1 and the limiting shoulder 23 of the inner shell 2. At the same time, such a setting is convenient for the composite filter element structure during the assembly process. The first filter element assembly 5 can be installed in the outer shell 1 first, and then the inner shell 2 is assembled, which facilitates the smooth assembly process. On the other hand, the limiting shoulder 23 is sealed and fixed to the first rear end cover 53. At the same time, the inner side surface of the first opening end 12 of the outer shell 1 abuts against the first front end cover 52. Such a setting effectively realizes the isolation between the branch water channels on both sides of the first sealing component, thereby avoiding the occurrence of water cross-talk between the branch water channels.

[0073] The first filter element assembly 5 includes a first filter element 51 and a first end cover.

[0074] The first filter element 51 is arranged around the inner shell body 2 and is spaced apart from the inner shell body 2 and the outer shell body 1. It can filter the liquid from the first water inlet 13 and guide it to the first water outlet 14; the first end cover includes a first front end cover 52 and a first rear end cover 53, which are respectively arranged at both ends of the first filter element 51 and are sealed with the first filter element 51. The first front end cover 52 is adjacent to the first opening end 12.

[0075] A limiting shoulder 23 is provided on the peripheral side surface of the inner shell 2, and the limiting shoulder 23 is sealed and fixed with the first rear end cover 53. On the one hand, the limiting shoulder 23 is provided, and the first filter element assembly 5 can be limited or fixed by cooperating with the inner side surface of the first opening end 12 of the outer shell 1 and the limiting shoulder 23 of the inner shell 2. At the same time, such a setting is convenient for the composite filter element structure to be assembled during the process, and the first filter element assembly 5 can be installed in the outer shell 1 first, and then the inner shell 2 can be assembled, which is convenient for the smooth assembly process. On the other hand, the limiting shoulder 23 is sealed and fixed with the first rear end cover 53, and at the same time, the inner side surface of the first opening end 12 of the outer shell 1 abuts against the first front end cover 52. Such a setting effectively realizes the isolation between the branch waterways on both sides of the first sealing component, and avoids the occurrence of water flow between the branch waterways.

[0076] A plurality of first protrusions 24 are provided along the circumference of the inner shell 2. Since the inner shell 2 has cavities for accommodating different water flows on both sides, it is necessary to withstand the structural deformation caused by the water pressure difference. By providing the first protrusions on the inner shell 2, the strength of the inner shell 2 is effectively enhanced, the resistance to deformation is increased, the working stability of the inner shell 2 is improved, the service life of the filter element is increased, and water flow between branch waterways is avoided.

[0077] The first filter element 51 is provided with an inner edge frame 511, and a plurality of water-permeable holes and a second protrusion 512 protruding toward one side of the inner shell 2 are evenly arranged on the inner edge frame 511, and the second protrusion 512 and the first protrusion 24 are arranged alternately. The second protrusion 512 and the first protrusion 24 on the inner edge frame 511 are arranged alternately, which, on the one hand, increases the structural strength of the first filter element 51 and the inner shell 2, avoids deformation due to pressure difference, and improves the working stability of the inner shell 2 and the first filter element 51, and increases the service life of the filter element. On the other hand, the alternately arranged second protrusion 512 and the first protrusion 24 prevent the water flow from flowing in while ensuring that the water flow in the water-containing space can flow freely, reduce the impact force of the water flow, and avoid the local water-facing side of the filter element parts from bearing excessive water pressure. The alternately arranged transverse ribs are conducive to guiding the water flow to different directions, distributing the water pressure to more force-bearing structures, and improving the bearing capacity of the filter element.

[0078] The inner housing 2 is integrally formed. This integrated arrangement effectively reduces the use of parts, reduces the mold cost and material cost of the parts, and also improves the assembly efficiency of the composite filter element.

[0079] The inner tube 3 includes: a central tube 33, including a third opening end 31, and is spaced apart from the inner shell body 2 to form a second accommodating space 6; a second filter element assembly 34, which can be axially extended along the central tube 33, one end of which is connected to the central tube 33, and the other end is fixedly connected to the inner wall of the inner shell body 2 on the side facing away from the opening end. The second filter element assembly 34 can filter the liquid in the second accommodating space 6 and transport it to the cavity 7.

[0080] The second filter element assembly 34 includes: a second filter element 341, which is arranged between the cavity 7 and the second accommodating space 6 and is spaced apart from the inner shell 2, and can filter the liquid from the second accommodating space 6 and guide it to the second water outlet 32. The second end cover includes a second front end cover 342 and a second rear end cover 3433, which are respectively arranged at both ends of the second filter element 341 and are sealed and connected to the second filter element 341. The second front end cover 342 abuts against the central tube 33, and the second rear end cover 3433 is fixedly connected to the inner wall of the outer shell on the side facing away from the opening end.

[0081] The outer sides of the first end cap and the second end cap are provided with a plurality of radial protrusions along the circumferential direction, and the protrusions abut against the inner wall of the outer shell 1. This arrangement can achieve effective support for the first accommodating space 4 and the second accommodating space 6, ensure the stability of the spacing between the first filter element assembly 5 and the inner shell 2 and the outer shell 1, and the spacing between the second filter element assembly 34 and the inner shell 2, and on the other hand, the gaps between adjacent protrusions can make the waterways in the first accommodating space 4 and the second accommodating space 6 unobstructed, ensuring that the water can flow in the preset direction.

[0082] The first switch structure 8 is tubular in shape, and its inner diameter is stepped. It has an elastic member built in and is sealed and connected to the first filter element assembly 5. It has the ability to move in the direction away from the first opening end 12 under the action of an external force and open the first water inlet 13 to allow water to pass through, and to abut against the inner wall of the first opening end 12 and close the first water inlet 13 to stop water.

[0083] The second switch structure 9 is tubularly sleeved on the inner side of the first switch structure 8, has an elastic member built in, and is sealed and connected to the outer side of the third opening end 31. It has the ability to move in the direction away from the first opening end 12 under the action of an external force, and open the first water outlet 14 and the second water inlet 22 to allow water to pass, and to abut against the inner wall of the first switch structure 8 and the outer wall of the inner tube 3 respectively, and close the first water outlet 14 and the second water inlet 22 to stop water.

[0084] The third switch structure 10 includes a valve core 101, and the outer end of the valve core 101 is sleeved with a pressure cover 102, which is fixed to the outer end of the second water outlet 32 ​​and can limit the valve core 101. The other end of the valve core 101 is sleeved with an elastic member and extends into the second water outlet 32 ​​to abut against the shoulder structure set in the second water outlet 32.

[0085] In this embodiment, the first filter element 51 is a PAC filter element, and the second filter element 341 is a carbon rod filter element. As a convertible embodiment, the first filter element 51 is a carbon rod filter element, and the second filter element 341 is a PAC filter element; or, one of the first filter element 51 and the second filter element 341 is an RO filter element.

[0086] In this embodiment, the outer shell 1, the inner shell 2 and the inner tube 3 are coaxially arranged. As a convertible embodiment, the outer shell 1, the inner shell 2 and the inner tube 3 can also be non-coaxially arranged. In this embodiment, the elastic member is a spring.

[0087] The outer shell 1 includes a filter bottle body 15 and a filter bottle cover 16. One end of the filter bottle body 15 is provided with a first opening end 12. The filter bottle cover 16 is fixedly arranged at the other end of the filter bottle body 15 facing away from the first opening end 12. The filter bottle cover 16 is connected with a filter element handle 17.

[0088] The filter bottle body 15 and the filter bottle cover 16, as well as the pressure cover 102 and the outer end of the second water outlet 32 ​​are connected by ultrasonic fixation. Since the filter element is used to treat the drinking water source of the human body, the material is mostly plastic parts, and the material can be softened and welded by ultrasonic vibration and pressure. At the same time, ultrasonic fixation has a series of advantages such as less time, energy saving and high efficiency, high degree of automation, good sealing and waterproof effect, etc., and it is more stable than gluing and is not prone to glue overflow.

[0089] This embodiment also provides a water purifier, including the above-mentioned composite filter element structure. The water purifier also includes a waterway plate, which is arranged in cooperation with the composite filter element structure, and is provided with a waterway conversion joint suitable for abutting with the first switch structure 8, the second switch structure 9, and the third switch structure 10 and isolating the first water inlet 13, the first water outlet 14, and the second water inlet 22.

[0090] Working process:

[0091] The composite filter element structure is installed in the filter element tube on the water purifier, and the side with the first opening end 12 is abutted against the water channel conversion joint on the water channel plate, squeezing the elastic parts on each switch structure, so that the filter elements on the first switch structure 8, the second switch structure 9 and the third switch structure 10 move simultaneously along the side away from the first opening end 12, so that the first water inlet 13 and the first water outlet 14 and the second water inlet 22 and the second water outlet 32 ​​change from a water-stopping state to a water-passing state.

[0092] like Figure 4 - Figure 6 , external water flows from the first water inlet 13 into the water path between the first filter element assembly 5 and the outer shell 1, and into the water path between the outer shell 1 and the inner shell 2 of the first filter element assembly 5 in the direction away from the first opening end 12, and then passes through the filtration of the first filter element 51, enters the water path between the first filter element assembly 5 and the inner shell 2, and is discharged through the first water outlet 14 between the first switch structure 8 and the second switch structure 9, completing the first filtration. The first filter element 51 is a PAC filter element, which can be used as a pre-filter to filter large particles such as mud and sand in the water.

[0093] The water that has passed the first filtration is filtered through the RO filter element inside the water purifier to complete the second filtration. As a reverse osmosis filter element, the RO filter element can filter out inorganic salts, organic matter, heavy metal ions, bacteria, pesticides, chloroform waste and other harmful substances in the water.

[0094] The water that has passed the second filtration re-enters the composite filter element structure from the second water inlet 22 between the second switch structure 9 and the central tube 33, and flows along the water path between the inner shell 2 and the central tube 33 to the second filter element assembly 34 and the inner shell 2, enters the cavity in the inner tube 3 through the filtration of the second filter element 341, and is discharged through the second water outlet 32, completing the third filtration. The second filter element assembly 34 is a carbon rod filter element, which can effectively filter out odors in the water and ensure the taste of the water.

[0095] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A composite filter element structure, characterized in that: include: An outer shell (1) has a built-in accommodating cavity, the outer shell (1) comprises a first opening end (12), and the first opening end (12) is connected to the accommodating cavity; The inner shell (2) is arranged inside the accommodating cavity, and a first accommodating space (4) is arranged between the inner shell (2) and the outer shell (1). A first filter element assembly (5) is arranged in the first accommodating space (4), which is suitable for dividing the first accommodating space (4). A plurality of first protrusions (24) are arranged along the circumference of the inner shell (2). The first filter element assembly (5) includes a first filter element (51). The first filter element (51) is provided with an inner edge frame (511). The inner edge frame (511) is provided with a protrusion toward one side of the inner shell (2). A second protruding portion (512) protrudes outwardly, the second protruding portion (512) and the first protruding portion (24) are arranged at an alternating interval, the second opening end (21) on the inner shell (2) is arranged inside the first opening end (12), and a first water inlet (13) and a first water outlet (14) are respectively formed along both sides of the first filter element assembly (5), and a first switch structure (8) is arranged between the first opening end (12) and the second opening end (21), which is suitable for controlling the opening and closing of the first water inlet (13) and the first water outlet (14); An inner tube (3) is arranged inside the inner shell (2), and a cavity (7) is arranged inside the inner tube. A second filter element assembly (34) is arranged on the inner tube. A second accommodating space (6) is arranged between the inner tube (3) and the inner shell (2). A third opening end (31) on the inner tube (3) is arranged inside the second opening end (21), and a second water inlet (22) is formed between the inner tube and the second opening end (21). A second switch structure (9) is provided, which is suitable for controlling the opening and closing of the second water inlet (22). The second water inlet (22) is connected to the second accommodating space (6). The cavity (7) is connected to the third opening end (31). A second water outlet (32) and a third switch structure (10) are provided on the third opening end (31). The third switch structure (10) is suitable for controlling the opening and closing of the second water outlet (32).

2. The composite filter element structure according to claim 1, characterized in that: The first filter element (51) is arranged around the inner shell (2) and spaced apart from the inner shell (2) and the outer shell (1), and is suitable for filtering liquid from the first water inlet (13) and directing the liquid to the first water outlet (14); The first filter element assembly (5) further comprises a first end cover, comprising a first front end cover (52) and a first rear end cover (53), which are respectively arranged at both ends of the first filter element (51) and are sealedly connected to the first filter element (51); the first front end cover (52) is arranged adjacent to the first opening end (12).

3. The composite filter element structure according to claim 2, characterized in that: A limiting shaft shoulder (23) is provided on the peripheral side surface of the inner shell (2), and the limiting shaft shoulder (23) is sealed and fixed to the first rear end cover (53).

4. The composite filter element structure according to claim 1, characterized in that: The inner shell (2) is integrally formed.

5. The composite filter element structure according to claim 2 or 3, characterized in that: The inner tube (3) comprises: a central tube (33), comprising a third open end (31), and spaced apart from the inner shell (2) to form the second accommodation space (6); The second filter element assembly (34) is suitable for being extended axially along the central tube (33), with one end being connected to the central tube (33) and the other end being fixedly connected to the inner wall of the inner shell (2) on the side facing away from the open end. The second filter element assembly (34) is suitable for filtering the liquid in the second accommodating space (6) and transporting it to the cavity (7).

6. The composite filter element structure according to claim 5, characterized in that: The second filter element assembly (34) comprises: A second filter element (341) is arranged between the cavity (7) and the second accommodating space (6), and is spaced apart from the inner shell (2), and is suitable for filtering liquid from the second accommodating space (6) and directing the liquid to the second water outlet (32); The second end cover comprises a second front end cover (342) and a second rear end cover (343), which are respectively arranged at two ends of the second filter element (341) and are sealedly connected to the second filter element (341); the second front end cover (342) is in contact with the central tube (33), and the second rear end cover (343) is fixedly connected to the inner wall of the outer shell (1) on the side facing away from the opening end.

7. The composite filter element structure according to claim 6, characterized in that: A plurality of radial protrusions are provided on the outer sides of the first end cover and the second end cover along the circumferential direction, and the radial protrusions abut against the inner wall of the outer shell (1).

8. The composite filter element structure according to claim 1, characterized in that: The third switch structure (10) comprises a valve core (101), the outer end of the valve core (101) is sleeved with a pressure cover (102), the pressure cover (102) is fixed to the outer end of the second water outlet (32) and is suitable for limiting the valve core (101), and the other end of the valve core (101) is sleeved with an elastic member and extends into the second water outlet (32) to abut against a shoulder structure arranged in the second water outlet (32).

9. The composite filter element structure according to claim 6, characterized in that: The first filter element (51) is a PAC filter element, and the second filter element (341) is a carbon rod filter element.

10. The composite filter element structure according to claim 1, characterized in that: The outer shell (1), the inner shell (2) and the inner tube (3) are coaxially arranged.

11. The composite filter element structure according to claim 8, characterized in that: The outer shell (1) comprises a filter bottle body (15) and a filter bottle cover (16); one end of the filter bottle body (15) is provided with the first opening end (12); the filter bottle cover (16) is fixedly arranged at the other end of the filter bottle body (15) facing away from the first opening end (12); and a filter element handle (17) is connected to the filter bottle cover (16).

12. The composite filter element structure according to claim 11, characterized in that: The filter bottle body (15) and the filter bottle cover (16), as well as the pressure cover (102) and the outer end of the second water outlet (32) are fixedly connected by ultrasound.

13. A water purifier, characterized in that: The composite filter element structure comprises the composite filter element structure described in any one of claims 1 to 12.

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