Composite filter element

Abstract

The composite filter element comprises a bottle body, a first filter element containing cavity and a second filter element containing cavity are formed in the bottle body and used for containing a first filter element assembly and a second filter element assembly respectively, and the first filter element containing cavity and the second filter element containing cavity are separated through a water separation piece; the first filter element accommodating cavity is communicated with an external water source through the first water inlet and is communicated with the second filter element accommodating cavity through the first water outlet and the second water inlet; the first filter element assembly comprises a pre-filtering piece, the first end of the pre-filtering piece is arranged close to the first face of the bottle body, and the second end of the pre-filtering piece is arranged close to the second face of the bottle body. A front filter part is arranged on the side, close to the water separation part, of the pre-filter part, the first end of the front filter part is arranged close to the first face of the bottle body, the second face of the front filter part is opposite to the first face, and the arrangement range of the front filter part is smaller than that of the pre-filter part. According to the composite filter element, the blocking time of the pre-filtering part can be delayed, so that the service life of the composite filter element is prolonged.

Description

Composite filter element Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a composite filter element. Background Technology

[0002] As water purifiers become smaller and more multifunctional, filter cartridges, as the core components of water purifiers, are becoming increasingly integrated, with a growing trend of integrating multiple filter cartridges into a single composite filter cartridge.

[0003] Composite filter cartridges in related technologies integrate multiple filtration components such as filter cotton, activated carbon rods, and reverse osmosis membranes into a single filter cartridge to meet multi-stage filtration requirements. Among them, the pre-filter element, which comes into contact with the water to be filtered first, undertakes the core function of intercepting suspended solids, rust, and other large particulate impurities, and its performance directly affects the overall lifespan of the filter cartridge.

[0004] However, the pre-filter is the first to clog because it comes into contact with the raw water, and its dirt-holding capacity becomes a key limitation on the life of the filter cartridge. Even if the subsequent activated carbon adsorption layer and reverse osmosis membrane still have filtration efficiency, the failure of the pre-filter will render the entire filter cartridge unusable. Summary of the Invention

[0005] Therefore, it is necessary to provide a composite filter element that can prevent clogging of the pre-filter and extend its service life to address the above-mentioned technical problems, and the following technical solution is adopted:

[0006] A composite filter element, comprising:

[0007] The bottle body has a first filter element receiving cavity and a second filter element receiving cavity inside, which are respectively used to receive the first filter element assembly and the second filter element assembly. The first filter element receiving cavity and the second filter element receiving cavity are separated by a water-proof component.

[0008] The first side of the bottle is provided with a first water inlet, a first water outlet and a second water inlet. The first filter element receiving cavity is connected to an external water source through the first water inlet and is connected to the second filter element receiving cavity through the first water outlet and the second water inlet.

[0009] The first filter element assembly includes: a pre-filter, the first end of which is disposed near the first surface of the bottle, and the second end of which is disposed near the second surface of the bottle; a pre-filter is disposed on the side of the pre-filter near the water separator, the first end of which is disposed near the first surface of the bottle, and the second surface is opposite to the first surface, and the placement range of the pre-filter is smaller than the placement range of the pre-filter.

[0010] In one embodiment, the first filter assembly further includes:

[0011] A pre-composite end cap is provided on the first side near the bottle body. The pre-composite end cap is connected to the first end of the pre-filter and is also connected to the first end of the pre-filter.

[0012] The pre-filter bottom cover is located on the second side near the bottle body. A first mounting groove is provided on the side of the pre-filter bottom cover facing the first side of the bottle body. The second end of the pre-filter component is installed in the first mounting groove. The other side of the pre-filter bottom cover abuts against the first shoulder of the water-blocking component.

[0013] In one embodiment, the first filter element assembly further includes: a pre-filter bottom cover, a second mounting groove is provided on the side of the pre-filter bottom cover facing the first surface of the bottle, the second mounting groove is used to install the second end of the pre-filter element, the side of the pre-filter bottom cover facing the second surface of the bottle abuts against the second shoulder of the water-separating element, and the second shoulder is located on the side of the first shoulder near the first surface of the bottle.

[0014] In one embodiment, the first side of the bottle body is further provided with a second water outlet and a third water outlet, and the second filter element assembly includes:

[0015] The central pipe is connected to the second outlet.

[0016] The reverse osmosis membrane is wrapped around the periphery of the central tube and is connected to the second inlet and the third outlet.

[0017] In one embodiment, a one-way valve is provided inside the central pipe, so that water entering the central pipe flows through the one-way valve to the second outlet.

[0018] In one embodiment, the second filter assembly further includes:

[0019] The skeleton is connected to the second outlet.

[0020] The carbon fiber is placed on the outside of the frame and connected to the outlet of the central tube.

[0021] In one embodiment, the second filter assembly further includes:

[0022] The rear outer cover is fitted onto the outside of the rear carbon fiber, and a first through hole communicating with the central tube is provided on the side of the rear outer cover near the central tube.

[0023] The rear top cover is snapped into the rear outer cover, and a second through hole communicating with the frame is opened on the side of the rear top cover near the second water outlet.

[0024] In one embodiment, a reverse osmosis end cap is disposed outside the rear outer cap and the rear upper cap, with the first end of the reverse osmosis end cap abutting against the bottle body and the second end of the reverse osmosis end cap abutting against the reverse osmosis membrane.

[0025] In one embodiment, the bottom of the first inlet, the second inlet, the first outlet, the second outlet, and the third outlet are all provided with receiving grooves, and the receiving grooves accommodate a backstop component, which includes:

[0026] The sonic ring is disposed at the first end of the inner sidewall of the receiving tank, the first end being close to the first water inlet, the second water inlet, the first water outlet, the second water outlet, or the third water outlet;

[0027] The elastic element is disposed in the receiving groove;

[0028] The plug is installed in the elastic element;

[0029] When the composite filter element is connected to the water circuit, the plug separates from the acoustic ring; when the composite filter element is disconnected from the water circuit, the elastic element causes the plug to engage with the acoustic ring.

[0030] In one embodiment, the inner walls of the first inlet, the second inlet, the first outlet, the second outlet, and the third outlet are provided with sealing elements.

[0031] In the filtration process using the composite filter element of this application, water from an external source enters the first filter element housing cavity through the first inlet. After preliminary filtration using the pre-filter and pre-filter carbon fiber, it flows through the first outlet and second inlet into the second filter element housing cavity, where it undergoes fine filtration using the second filter element assembly. The pure water produced after fine filtration is discharged from the second outlet, and the wastewater produced is discharged from the third outlet. In this application, the pre-filter extends from the first side to the second side of the bottle body, ensuring sufficient filtration surface area during preliminary filtration to adapt to high-flow-rate water filtration scenarios and delaying the clogging time of the pre-filter, thereby extending the service life of the composite filter element. Attached Figure Description

[0032] Figure 1 is a schematic diagram of the structure of a composite filter element in one embodiment;

[0033] Figure 2 is a top structural diagram of the composite filter element in one embodiment;

[0034] Figure 3 is a diagram showing the inlet and outlet distribution of the composite filter element in one embodiment;

[0035] Figure 4 is a schematic diagram of the filtration water path of the first filter element assembly in one embodiment;

[0036] Figure 5 is a schematic diagram of the filtration water path of the second filter element assembly in one embodiment;

[0037] Figure 6 is a schematic diagram of the backstop component in one embodiment;

[0038] Attached image annotations:

[0039] 1. Bottle body; 11. Top cap; 12. Bottom cap;

[0040] 21. First water inlet; 22. First water outlet; 23. Second water inlet; 24. Second water outlet; 25. Third water outlet;

[0041] 31. Pre-filter composite end cap; 32. Pre-filter bottom cap; 33. Pre-filter element; 34. Pre-filter element; 35. Pre-filter bottom cap;

[0042] 41. Central tube; 411. Water permeation hole; 42. Reverse osmosis membrane; 43. One-way valve; 44. Frame; 45. Post-carbon fiber filter; 46. Post-external cover; 47. Post-top cover; 48. Post-bottom cover; 49. Reverse osmosis end cover;

[0043] 5. Waterproof component; 51. First shoulder; 52. Second shoulder;

[0044] 61. Acoustic ring; 62. Elastic element; 63. Plug; 64. Seal;

[0045] 71. Swivel-melted bottom cover; 72. Rotating disc; 73. Handle pin; 74. Handle. Detailed Implementation

[0046] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0047] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0052] The embodiments of this application will be further described in detail below with reference to Figures 1-6.

[0053] Figure 1 shows a schematic diagram of the composite filter element in one embodiment of this application; Figure 2 shows a top structural diagram of the composite filter element in one embodiment of this application; Figure 3 shows a diagram of the inlet and outlet distribution of the composite filter element in one embodiment of this application. Referring to Figures 1 to 3, a composite filter element provided in one embodiment of this application includes:

[0054] The bottle body 1 has a first filter element receiving cavity and a second filter element receiving cavity inside, which are used to receive the first filter element assembly and the second filter element assembly, respectively. The first filter element receiving cavity and the second filter element receiving cavity are separated by a water-separating component 5. The first side of the bottle body 1 has a first water inlet 21, a first water outlet 22 and a second water inlet 23. The first filter element receiving cavity is connected to an external water source through the first water inlet 21 and is connected to the second filter element receiving cavity through the first water outlet 22 and the second water inlet 23. The first filter element assembly includes: a pre-filter 33, the first end of the pre-filter 33 is located close to the first side of the bottle body 1 and the second end of the pre-filter 33 is located close to the second side of the bottle body 1. A pre-filter 34 is located on the side of the pre-filter 33 close to the water-separating component 5. The first end of the pre-filter 34 is located close to the first side of the bottle body 1 and the second side is opposite to the first side. The setting range of the pre-filter is smaller than the setting range of the pre-filter.

[0055] In the view shown in Figure 1, the first surface of the bottle body 1 is the top surface, and the second surface is the bottom surface. Multiple dividing ribs are provided on the inner wall of the bottle body 1 for engaging with either the first or second filter element assembly. The water-separating component 5 abuts against one set of dividing ribs, dividing the interior of the bottle body 1 into a first filter element receiving cavity and a second filter element receiving cavity. The first filter element receiving cavity is located on the outer periphery of the second filter element receiving cavity.

[0056] The first filter element assembly uses a pre-filter 33 and a pre-filter 34 to perform preliminary filtration of water from an external water source to remove large particulate impurities. The pre-filter 33 can be PP (Polypropylene) cotton, stainless steel filter screen, nylon filter screen, or microporous ceramic. The pre-filter 34 is mainly used to adsorb residual chlorine, odors, and large molecular organic matter. The pre-filter 34 can be granular activated carbon or compressed activated carbon with a large pore size, which has a strong adsorption capacity and a fast flow rate to meet the needs of high-flow-rate filtration.

[0057] The second filter element may include an UF membrane (Ultrafiltration Membrane), an NF membrane (Nanofiltration Membrane), or an RO membrane (Reverse Osmosis Membrane) for fine filtration of water that has been preliminarily filtered by the first filter element, in order to remove tiny particles, bacteria, viruses, heavy metals, dissolved organic matter, etc.

[0058] In one possible implementation, as shown in Figure 3, the first side of the bottle body 1 is also provided with a second water outlet 24 and a third water outlet 25. Both the second water outlet 24 and the third water outlet 25 are connected to the second filter element assembly. One of them is used to discharge the wastewater generated after fine filtration, and the other is used to discharge pure water. The following description takes the example of the second water outlet 24 discharging pure water and the third water outlet 25 discharging wastewater.

[0059] Optionally, the pre-filtered water flowing out of the first outlet 22 can be pressurized by a booster motor, and the pressurized pre-filtered water enters the second filter element assembly from the second inlet 23.

[0060] Figure 4 shows a schematic diagram of the filtration water path of the first filter element assembly in one embodiment of this application. As indicated by the yellow and blue arrows in Figure 4, during the filtration process using the composite filter element in this embodiment, water from an external source enters the first filter element housing cavity through the first inlet 21. After preliminary filtration through the pre-filter 33 and pre-filter 34, it flows out of the first filter element housing cavity through the first outlet 22. Then, it enters the second filter element housing cavity through the second inlet 23 and undergoes fine filtration through the second filter element assembly. The pure water produced after fine filtration is discharged from the second outlet 24, and the wastewater produced is discharged from the third outlet 25. In this way, the preliminary filtration and fine filtration use independent inlets and outlets and independent filtration water paths, which can prevent pollution and improve the reliability of the water purification process while meeting the requirements of multi-stage filtration.

[0061] In this embodiment, the pre-filter 33 extends from the first side to the second side of the bottle body. During the initial filtration process, it can ensure sufficient filtration surface area to adapt to high-flow water filtration scenarios and delay the clogging time of the pre-filter, thereby extending the service life of the composite filter element.

[0062] Referring to Figures 1 and 4, in one embodiment of this application, the first filter element assembly in the composite filter element further includes: a front composite end cap 31, disposed near the first side of the bottle body 1, the front composite end cap 31 being connected to the first end of the pre-filter element 33 and to the first end of the pre-filter element 34; a pre-filter bottom cap 32, disposed near the second side of the bottle body 1, the pre-filter bottom cap 32 having a first mounting groove on the side facing the first side of the bottle body 1, the first mounting groove being used to install the second end of the pre-filter element 33, and the other side of the pre-filter bottom cap 32 abutting against the first shoulder 51 of the water-blocking element 5.

[0063] Among them, the end of the front composite end cap 31 facing the first side of the bottle body 1 abuts against the partition rib in the bottle body 1, and the end facing the second side of the bottle body 1 is provided with a slot, which is respectively engaged with the first end of the pre-filter 33 and the first end of the front filter 34.

[0064] In this embodiment, the first end of the pre-filter and the first end of the pre-carbon fiber share a pre-composite end cap, which can effectively utilize the space of the first filter element accommodating cavity and save materials and reduce costs.

[0065] In one possible implementation, the first filter element assembly further includes a pre-filter bottom cover 35. The pre-filter bottom cover 35 has a second mounting groove on the side facing the first surface of the bottle body 1. The second mounting groove is used to install the second end of the pre-filter element 34. The side of the pre-filter bottom cover 35 facing the second surface of the bottle body 1 abuts against the second shoulder 52 of the water-blocking element 5. The second shoulder 52 is located on the side of the first shoulder 51 near the first surface of the bottle body 1.

[0066] The pre-filter bottom cover 35 and the water-isolating component 5 are sealed together by an O-ring. In this way, the water filtered by the pre-filter 33 can be filtered again by the pre-filter 34, ensuring sufficient filtration and avoiding water mixing that could contaminate the filtered water.

[0067] It is understood that the size of the pre-filter 34 along the axial direction of the bottle body is smaller than the size of the pre-filter 33 along the axial direction of the bottle body, that is, the setting range of the pre-filter 34 is smaller than the setting range of the pre-filter 33.

[0068] Figure 5 shows a schematic diagram of the filtration water path of the second filter element assembly in one embodiment of this application. In Figure 5, the water path indicated by the blue arrow represents the water path for obtaining pure water; the water path indicated by the red arrow represents the water path for discharging wastewater. Referring to Figures 1 and 5, the second filter element assembly in the composite filter element provided in one embodiment of this application includes: a central tube 41, which is connected to the second outlet 24; and a reverse osmosis membrane 42, which covers the periphery of the central tube 41 and is connected to the second inlet 23 and the third outlet 25.

[0069] The central tube 41 has a water permeable hole 411, which allows water filtered by the reverse osmosis membrane 42 to enter the central tube 41 through the water permeable hole 411.

[0070] Optionally, a one-way valve 43 is provided inside the central pipe 41, allowing water entering the central pipe 41 to flow to the second outlet 24 through the one-way valve 43. In this way, the water entering the central pipe 41 can flow in one direction, preventing the filtered water from being contaminated by backflow.

[0071] In one possible implementation, the second filter element assembly further includes: a frame 44, which is connected to the second outlet 24; and a post-carbon fiber 45, which is disposed on the outside of the frame 44 and connected to the outlet of the central tube 41.

[0072] From the perspective of Figure 1, the skeleton 44 is positioned on top of the central tube 41 to support the rear carbon fiber 45. Optionally, the skeleton 44 can be made of PP cotton or plastic with permeable holes.

[0073] The post-filter carbon fiber 45 is mainly used to further remove organic pollutants, heavy metal ions, and microorganisms from the initially filtered water, thereby improving the taste. The post-filter carbon fiber 45 can be made of ultra-fine fibrous activated carbon, which has a smaller pore size and a larger specific surface area than the pre-filter element 34, resulting in more precise adsorption.

[0074] In one possible implementation, the second filter element assembly further includes: a rear outer cover 46, sleeved on the outside of the rear carbon fiber 45, the rear outer cover 46 having a first through hole communicating with the central tube 41 on the side near the central tube 41; and a rear upper cover 47, snapped onto the rear outer cover 46, the rear upper cover 47 having a second through hole communicating with the skeleton 44 on the side near the second water outlet 24.

[0075] The rear outer cover 46 and the rear upper cover 47 are snapped together to form a cavity inside, which is used to accommodate the skeleton 44 and the rear carbon fiber 45. Water collected in the central tube 41 enters the cavity through the first through hole on the rear outer cover 46, is filtered by the rear carbon fiber 45 to obtain pure water, then enters the skeleton 44, and flows out through the second through hole on the rear upper cover 47 to the second outlet 24.

[0076] Optionally, the second filter assembly also includes a rear bottom cover 48, disposed between the rear outer cover 46 and the rear carbon fiber 45. The rear bottom cover 48 is roughly "mountain" shaped, with its side facing the rear carbon fiber 45 abutting against both the rear carbon fiber 45 and the frame 44. This ensures that the filtered water in the central pipe 41 is filtered again by the rear carbon fiber 45 before being output through the frame 44, preventing the filtered water in the central pipe 41 from directly entering the frame 44 through the first through-hole, thus avoiding insufficient filtration.

[0077] In one possible implementation, the second filter element assembly further includes: a reverse osmosis end cap 49 disposed outside the rear outer cap 46 and the rear upper cap 47, with a first end of the reverse osmosis end cap 49 abutting against the bottle body 1 and a second end of the reverse osmosis end cap 49 abutting against the reverse osmosis membrane 42.

[0078] The reverse osmosis end cap 49 is disposed between the water-isolating element 5 and the cavity formed by the rear outer cover 46 and the rear upper cover 47. The reverse osmosis end cap 49 divides the space between the water-isolating element 5 and the cavity into a first gap and a second gap. The first gap is connected to the second inlet 23 and the reverse osmosis membrane 42, and the second gap is connected to the reverse osmosis membrane 42 and the third outlet 25. In this way, the water that has been preliminarily filtered by the first filter element enters the filtration area of ​​the reverse osmosis membrane 42 through the first gap from the second inlet 23. The wastewater remaining after filtration by the reverse osmosis membrane 42 flows out from the third outlet 25 through the second gap.

[0079] In this embodiment, the second filter element assembly is used to perform fine filtration on the water that has passed through the first filter element assembly. The water that has passed through the first filter element assembly enters the second filter element assembly from the second inlet 23. The wastewater generated after filtration by the reverse osmosis membrane 42 is discharged from the third outlet 25. The generated pure water enters the central tube and flows out from the second outlet 24. The filtration structure is compact and reasonable, which can effectively save the volume of the composite filter element and improve the filtration efficiency.

[0080] Figure 6 shows a schematic diagram of the backflow prevention component in one embodiment of this application. Referring to Figure 6, the bottom of the first inlet 21, first outlet 22, second inlet 23, second outlet 24, and third outlet 25 of the composite filter element provided in one embodiment of this application are all provided with receiving grooves. The receiving grooves accommodate the backflow prevention component, which includes: a sonic ring 61, disposed at the first end of the inner sidewall of the receiving groove, the first end being close to the first inlet 21, first outlet 22, second inlet 23, second outlet 24, or third outlet 25; an elastic element 62, disposed in the receiving groove; and a plug 63, installed in the elastic element 62. When the composite filter element is connected to the water circuit, the plug 63 separates from the sonic ring 61; when the composite filter element is disconnected from the water circuit, the elastic element 62 drives the plug 63 to abut against the sonic ring 61.

[0081] The plug 63 can be conical or bowl-shaped, and the material of the plug 63 can be food-grade silicone.

[0082] When water flows through, the acoustic ring 61 can generate micro-vibrations or sound waves at a certain frequency, which helps to reduce scale buildup and extend the service life of the composite filter element.

[0083] When the inlet and outlet are connected to the external pipeline and connected to the water circuit, the external pipeline applies pressure to the elastic element 62 or the plug 63 to open the plug 63. The elastic element 62 undergoes elastic deformation, the plug 63 separates from the sonic ring 61, and the water circuit is opened. When the external pipeline is pulled out, the elastic element 62 rebounds, driving the plug 63 to cut off the water circuit and prevent the filtered pure water from being contaminated.

[0084] In one possible implementation, the inner walls of the first inlet 21, the first outlet 22, the second inlet 23, the second outlet 24, and the third outlet 25 are provided with sealing elements 64.

[0085] The sealing element 64 can be a single-layer or double-layer sealing ring made of rubber or silicone to ensure a tight connection between the composite filter element and the external pipeline. During the disassembly of the composite filter element, the sealing element 64, together with the plug 63 and the elastic element 62, cuts off the water passage inside the bottle 1 from the external pipeline, preventing water from the external pipeline from flowing into the bottle 1.

[0086] The backflow prevention component in this embodiment can control the water flow direction during the installation and removal of the composite filter element and external pipeline, preventing water overflow or backflow from causing pollution, and ensuring the stability and reliability of the water purification system.

[0087] Referring again to Figure 1, the composite filter element provided in one embodiment of this application further includes: a fusion bottom cover 71, which is fused to the bottle body 1 by means of hot-melt welding and mechanical tightening, which can prevent tiny gaps from appearing at the bottom of the composite filter element and prevent the interface from breaking or leaking under high water pressure.

[0088] In one possible implementation, referring to Figures 1 and 2, the composite filter element further includes: a top cap 11 and a bottom cap 12, the top cap 11 being pressed against the first side of the bottle body 1; and the bottom cap 12 being pressed against the second side of the bottle body 1.

[0089] In one possible implementation, the composite filter element further includes: a rotating disk 72 disposed at the bottom of the bottle body 1; a handle pin 73 engaged with the rotating disk 72; and a handle 74 engaged with the handle pin 73. Thus, during the loading and unloading of the composite filter element, the bottle body 1 can be easily and quickly removed from the machine by operating the rotating disk 72; and the bottle body 1 can be easily picked up using the handle 74 and the handle pin 73, improving the ease of assembly of the composite filter element.

[0090] Referring to Figures 1 to 6, the composite filter element in one embodiment of this application includes:

[0091] Bottle body 1 has a first filter element receiving cavity and a second filter element receiving cavity inside, which are used to receive the first filter element assembly and the second filter element assembly, respectively. The first filter element receiving cavity and the second filter element receiving cavity are separated by a water separator 5. The first side of the bottle body 1 is provided with a first water inlet 21, a first water outlet 22 and a second water inlet 23. The first filter element receiving cavity is connected to an external water source through the first water inlet 21 and is connected to the second filter element receiving cavity through the first water outlet 22 and the second water inlet 23.

[0092] The first filter element assembly includes: a pre-filter 33, with its first end near the first surface of the bottle body 1 and its second end near the second surface of the bottle body 1; a pre-filter 34 is provided on the side of the pre-filter 33 near the water-isolating component 5, with its first end near the first surface of the bottle body 1 and its second surface facing away from the first surface, and the setting range of the pre-filter being smaller than that of the pre-filter; a pre-composite end cap 31, located near the first surface of the bottle body 1, connected to the first end of the pre-filter 33 and the first end of the pre-filter 34; and a pre-filter bottom cap 32, located near the second surface of the bottle body 1, with a first mounting groove on the side of the pre-filter bottom cap 32 facing the first surface of the bottle body 1, in which the second end of the pre-filter 33 is installed, and the other side of the pre-filter bottom cap 32 abuts against the first shoulder 51 of the water-isolating component 5.

[0093] The second filter element assembly includes: a central tube 41, which is connected to the second outlet 24; and a reverse osmosis membrane 42, which covers the periphery of the central tube 41 and is connected to the second inlet 23 and the third outlet 25. A one-way valve 43 is provided inside the central tube 41, allowing water entering the central tube 41 to flow to the second outlet 24 through the one-way valve 43; a skeleton 44 is connected to the second outlet 24; a post-carbon fiber 45 is provided outside the skeleton 44 and is connected to the outlet of the central tube 41; a post-outer cover 46 is fitted outside the post-carbon fiber 45, and a first through hole connected to the central tube 41 is provided on the side of the post-outer cover 46 near the central tube 41; a post-upper cover 47 is snapped into the post-outer cover 46, and a second through hole connected to the skeleton 44 is provided on the side of the post-upper cover 47 near the second outlet 24; a reverse osmosis end cap 49 is provided outside the post-outer cover 46 and the post-upper cover 47, with the first end of the reverse osmosis end cap 49 abutting against the bottle body 1 and the second end of the reverse osmosis end cap 49 abutting against the reverse osmosis membrane 42.

[0094] The bottom of the first inlet 21, the first outlet 22, the second inlet 23, the second outlet 24, and the third outlet 25 are provided with receiving grooves, which contain a backflow prevention component. The backflow prevention component includes: a sonic ring 61, which is disposed at the first end of the inner sidewall of the receiving groove, and the first end is close to the first inlet 21, the first outlet 22, or the second inlet 23; an elastic element 62, which is disposed in the receiving groove; and a plug 63, which is embedded in the elastic element 62. When the composite filter element is connected to the water circuit, the plug 63 separates from the sonic ring 61; when the composite filter element is disconnected from the water circuit, the elastic element 62 drives the plug 63 to abut against the sonic ring 61.

[0095] The inner walls of the first inlet 21, the first outlet 22, the second inlet 23, the second outlet 24, and the third outlet 25 are provided with sealing elements 64.

[0096] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0097] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0098] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A composite filter element, characterized in that, The composite filter element includes: a bottle body, wherein a first filter element receiving cavity and a second filter element receiving cavity are provided inside the bottle body for receiving the first filter element assembly and the second filter element assembly, respectively, and the first filter element receiving cavity and the second filter element receiving cavity are separated by a water-separating component; a first water inlet, a first water outlet and a second water inlet are provided on the first side of the bottle body, the first filter element receiving cavity is connected to an external water source through the first water inlet, and is connected to the second filter element receiving cavity through the first water outlet and the second water inlet; wherein, the first filter element assembly includes: a pre-filter, the first end of the pre-filter is disposed near the first side of the bottle body, the second end of the pre-filter is disposed near the second side of the bottle body; a pre-filter is disposed on the side of the pre-filter near the water-separating component, the first end of the pre-filter is disposed near the first side of the bottle body, the second side is opposite to the first side, and the placement range of the pre-filter is smaller than the placement range of the pre-filter.

2. The composite filter element according to claim 1, characterized in that, The first filter element assembly further includes: a front composite end cap, disposed near the first side of the bottle body, the front composite end cap being connected to the first end of the pre-filter element and the first end of the pre-filter element; and a pre-filter bottom cap, disposed near the second side of the bottle body, the pre-filter bottom cap having a first mounting groove on the side facing the first side of the bottle body, the first mounting groove being used to install the second end of the pre-filter element, and the other side of the pre-filter bottom cap abutting against the first shoulder of the water-blocking element.

3. The composite filter element according to claim 2, characterized in that, The first filter element assembly further includes: a front filter bottom cover, wherein a second mounting groove is provided on the side of the front filter bottom cover facing the first surface of the bottle body, the second mounting groove is used to install the second end of the front filter element, the side of the front filter bottom cover facing the second surface of the bottle body abuts against the second shoulder of the water-proof component, and the second shoulder is located on the side of the first shoulder near the first surface of the bottle body.

4. The composite filter element according to claim 1, characterized in that, The first side of the bottle body is also provided with a second water outlet and a third water outlet. The second filter element assembly includes: a central tube, which is connected to the second water outlet; and a reverse osmosis membrane, which is wrapped around the periphery of the central tube. The reverse osmosis membrane is connected to the second water inlet and the third water outlet.

5. The composite filter element according to claim 4, characterized in that, A one-way valve is provided inside the central pipe, so that the water entering the central pipe flows to the second outlet through the one-way valve.

6. The composite filter element according to claim 4, characterized in that, The second filter element assembly further includes: a frame, which is connected to the second outlet; and a post-carbon fiber, which is disposed on the outside of the frame and connected to the outlet of the central tube.

7. The composite filter element according to claim 6, characterized in that, The second filter element assembly further includes: a rear outer cover, sleeved on the outside of the rear carbon fiber, the rear outer cover having a first through hole communicating with the central tube on the side near the central tube; and a rear upper cover, snapped into the rear outer cover, the rear upper cover having a second through hole communicating with the skeleton on the side near the second water outlet.

8. The composite filter element according to claim 7, characterized in that, The second filter element assembly further includes: a reverse osmosis end cap, disposed outside the rear outer cap and the rear upper cap, wherein the first end of the reverse osmosis end cap abuts against the bottle body and the second end of the reverse osmosis end cap abuts against the reverse osmosis membrane.

9. The composite filter element according to claim 4, characterized in that, Each of the first inlet, second inlet, first outlet, second outlet, and third outlet has a receiving groove at its bottom. A backflow prevention assembly is housed within each receiving groove. The backflow prevention assembly includes: a sonic ring disposed at a first end of the inner wall of the receiving groove, the first end being close to the first inlet, second inlet, first outlet, second outlet, or third outlet; an elastic element disposed within the receiving groove; and a plug installed within the elastic element. When the composite filter element is connected to the water circuit, the plug separates from the sonic ring. When the composite filter element is disconnected from the water circuit, the elastic element causes the plug to abut against the sonic ring.

10. The composite filter element according to claim 4, characterized in that, The inner walls of the first water inlet, the second water inlet, the first water outlet, the second water outlet, and the third water outlet are provided with sealing elements.

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