CN205346995U - Composite filter element and have its composite filter element subassembly - Google Patents

Abstract

The utility model discloses a composite filter element and a composite filter element assembly thereof. The composite filter element comprises: a pretreatment filter element assembly, a fine filter element assembly and an activated carbon filter element assembly arranged in sequence along the water flow direction. The pretreatment filter element assembly, The fine filter element assembly is connected to the activated carbon filter element assembly. According to the composite filter element of the present invention, the water flow can be filtered layer by layer through the pretreatment filter element assembly, the fine filter element assembly and the activated carbon filter element assembly in sequence, thereby ensuring the quality of the effluent water, adjusting the taste of the effluent water and reducing the volume of the composite filter element.

Description

Composite filter element and composite filter element assembly having same

technical field

The utility model relates to the technical field of water purification, in particular to a composite filter element and a composite filter element assembly with the same.

Background technique

In related technologies, water purification equipment usually uses PP cotton, activated carbon, etc. as pre-filter elements, and then connects RO (wherein, RO is the abbreviation of Reverse Osmosis in English, and reverse osmosis and reverse osmosis in Chinese) in series. The water purification system is formed, and the water is further purified by the water purification system. The pipeline connections of the entire water purification system are complicated, and it is inconvenient to install and replace parts. The risk of water leakage through multi-joint connections is high. Furthermore, commonly used composite filter elements include carbon rod + ultrafiltration filter element, PP + activated carbon composite filter element, granular activated carbon + ultrafiltration, etc. However, due to sealing pressure and performance reasons, the composite filter element of nanofiltration membrane or reverse osmosis membrane rare.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the first aspect of the utility model is to provide a composite filter element, the volume of which is reduced and the mouthfeel of the water outlet can be adjusted.

The second aspect of the present invention is to propose a composite filter element assembly provided with the above composite filter element.

According to the composite filter element of the embodiment of the first aspect of the present invention, the composite filter element includes a pretreatment filter element assembly, a fine filter element assembly and an activated carbon filter element assembly arranged in sequence along the water flow direction, the pretreatment filter element assembly, the fine filter element assembly The assembly is connected to the activated carbon filter element assembly.

According to the composite filter element of the embodiment of the first aspect of the utility model, the water flow can be filtered layer by layer through the pretreatment filter element assembly, the fine filter element assembly and the activated carbon filter element assembly, thereby ensuring the quality of the effluent water, adjusting the taste of the effluent, and reducing the Composite filter volume.

In addition, the composite filter element according to the above-mentioned embodiment of the utility model can also have the following additional technical features:

According to an embodiment of the present utility model, the pretreatment filter element assembly is in the shape of a straight cylinder with a closed upper end and an open lower end, and the fine filter element assembly and the activated carbon filter element assembly are arranged from top to bottom along the axial direction of the pretreatment filter element assembly. The bottom is sequentially arranged on the inner side of the pretreatment filter element assembly.

Further, the activated carbon filter element assembly includes: a housing, the upper end of the housing is formed with an activated carbon filter inlet and the lower end of the housing is formed with an activated carbon filter outlet, and the activated carbon filter inlet is connected to the fine filter element; activated carbon, the The activated carbon is spaced between the inlet of the activated carbon filter element and the outlet of the activated carbon filter element.

Further, a bracket is provided inside the housing, the activated carbon is arranged on the bracket and closes the inlet of the activated carbon filter element, and a water passage is defined between the bracket and the housing.

Further, the bracket includes: an annular side plate, the annular side plate is connected to the bottom wall of the housing and extends upward, the outlet of the activated carbon filter element is located inside the annular side plate, and the annular side plate is connected to the The surrounding walls of the housing are spaced apart, and the lower end of the annular side plate is formed with a through hole communicating with the outlet of the activated carbon filter element; a bottom plate, the bottom plate is arranged in the annular side plate, and the periphery of the bottom plate is connected to the The inner peripheral surfaces of the annular side plates are connected, the bottom plate is spaced apart from the bottom surface of the housing, and the through hole is formed under the bottom plate.

Optionally, the housing is provided with a first sleeve connected to the periphery of the inlet of the activated carbon filter element and extending downwards, and the lower end of the first sleeve is provided with a limiting flange extending inwards.

Optionally, the housing includes an upper cover and a base, the upper cover is set on the base, the inlet of the activated carbon filter element is formed on the upper cover, and the outlet of the activated carbon filter element is formed on the base .

According to some embodiments of the present utility model, a mounting plate is provided on the inner peripheral surface of the pretreatment filter element, a pure water port is formed in the middle of the mounting plate, and a The waste water port, the activated carbon filter element assembly is arranged on the mounting plate and communicated with the pure water port, and the activated carbon filter element assembly and the inner peripheral surface of the pretreatment filter element define a communication port for the waste water waste water channel.

Further, a second sleeve is provided on the mounting plate, and the second sleeve is connected with the periphery of the pure water port and extends downward.

Optionally, the upper and lower ends of the fine filter element are respectively connected to the top wall of the pretreatment filter element and the installation plate, and the lower end of the fine filter element is connected to the inner peripheral surface of the pretreatment filter element Features a sealed leather cup.

Further, the fine filtration filter element includes: a central water collection pipe, the central water collection pipe extends along the up and down direction, the upper end of the central water collection pipe is closed and connected to the top wall of the pretreatment filter element, the central water collection pipe The lower end is open and connected to the installation plate and inserted into the pure water port, and a water collection hole is formed on the peripheral wall of the central water collection pipe; a fine filter membrane is sleeved on the outside of the central water collection pipe And cover the water collection hole.

The composite filter element is a large flux composite filter element, and the water outlet speed of the composite filter element is not less than 1L/min.

The composite filter element assembly according to the embodiment of the second aspect of the present invention includes: a filter bottle, the upper end of which is open and the lower end is closed; a composite filter element, which is detachably and removablely arranged in the filter bottle, The composite filter element is the above-mentioned composite filter element; a filter bottle cap, the filter bottle cap is arranged on the upper end of the filter bottle for opening or closing the upper end of the filter bottle, and the filter bottle compresses the composite A filter element; a pressure ring, the pressure ring is detachably connected with the filter bottle and presses the filter bottle cap.

Description of drawings

Fig. 1 is a cross-sectional view of a composite filter element according to an embodiment of the present invention.

Fig. 1a is a partially enlarged schematic diagram of circle A in Fig. 1 .

Fig. 2 is a cross-sectional view of an activated carbon filter element assembly of a composite filter element according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a composite filter element according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a composite filter element assembly according to an embodiment of the present invention.

Reference signs:

Composite filter element 100, pretreatment filter element assembly 110, fine filter element assembly 120, activated carbon filter element assembly 130, central water collection pipe 121, fine filter membrane 122, water collection hole 123, shell 131, activated carbon 132, activated carbon filter element inlet 133, activated carbon filter element outlet 134, bracket 135, water channel 136, annular side plate 137, bottom plate 138, through hole 139, first sleeve pipe 101, limit flange 102, loam cake 103, base 104, mounting plate 105, pure water port 106, Waste water port 107, waste water channel 108, second casing 109, sealing cup 111, folded PP layer 112, composite filter element assembly 200, filter bottle 210, filter bottle cap 220, handle 201.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The composite filter element 100 according to the embodiment of the first aspect of the present utility model will be described in detail below with reference to FIGS. 1 to 4 .

Referring to Fig. 1, the composite filter element 100 according to the embodiment of the present utility model comprises a pretreatment filter element assembly 110, a fine filter element assembly 120 and an activated carbon filter element assembly 130 arranged in sequence along the water flow direction, a pretreatment filter element assembly 110, a fine filter element assembly 120 It can be connected with the activated carbon filter element assembly 130. That is to say, the pretreatment filter element assembly 110, the fine filter element assembly 120 and the activated carbon filter element assembly 130 are connected together, that is to say, the pretreatment filter element assembly 110, the fine filter element assembly 120 and the activated carbon filter element assembly 130 form an integral composite filter element 100. Therefore, the composite filter element 100 of the present invention has a high degree of integration, which can reduce the volume of the composite filter element 100 while ensuring the water quality of the effluent.

According to the composite filter element 100 of the embodiment of the utility model, the water flow can be filtered layer by layer through the pretreatment filter element assembly 110, the fine filter element assembly 120 and the activated carbon filter element assembly 130, thereby ensuring the quality of the effluent water, adjusting the taste of the effluent, and reducing the The volume of the composite filter element 100 is small.

In addition, the composite filter element 100 is equipped with an activated carbon filter element assembly 130, which can remove volatile VOC, residual chlorine and organic matter, and also retain necessary minerals such as trace calcium, silicic acid, and carbonate to make the taste sweet and soft.

As shown in Figure 1, the pretreatment filter element assembly 110 can be in the shape of a straight cylinder with an upper end (for example, the upper end of the pretreatment filter element assembly 110 in Figure 1 ) closed and a lower end (for example, the lower end of the pretreatment filter element assembly 110 in Figure 1 ), The fine filter element assembly 120 and the activated carbon filter element assembly 130 may be sequentially arranged on the inner side of the pretreatment element assembly 110 along the axial direction of the pretreatment element element assembly 110 (for example, the up and down direction shown in FIG. One side of the centerline of the pretreatment cartridge assembly 110). Therefore, the pretreatment filter element assembly 110 is arranged in a hollow column shape, so that the pretreatment filter element assembly 110 has a larger filtration area, thereby effectively improving the filtration efficiency of the composite filter element 100 and being convenient to use.

Moreover, the hollow columnar structure of the pretreatment filter element assembly 110 can facilitate the installation and disassembly of the fine filter element assembly 120 and the activated carbon filter element assembly 130 , and can also improve the filtering effect of the composite filter element 100 .

In addition, the water flow can be filtered multiple times through the composite filter element 100, so that the mouthfeel of the water can be adjusted.

It can also be that the pretreatment filter element assembly 110 is in the shape of a straight cylinder with a closed lower end and an open upper end, and the fine filter element assembly 120 and the activated carbon filter element assembly 130 are from bottom to top along the axial direction of the pretreatment filter element assembly 110 (for example, shown in FIG. 1 Up and down directions) are sequentially arranged on the inside of the pretreatment filter element assembly 110, thereby meeting the requirement of adjusting the mouthfeel of the outlet water. The utility model does not specifically limit the arrangement positions of the pretreatment filter element assembly 110 , the fine filter element assembly 120 and the activated carbon filter element assembly 130 , and can be adaptively adjusted according to needs in practical applications.

Of course, the pretreatment filter element assembly 110 can also be set in other shapes, such as a spherical shape. The fine filter element assembly 120 and the activated carbon filter element assembly 130 can also be arranged in a nested form.

Further, referring to FIG. 2 in combination with FIG. 1 , the activated carbon filter element assembly 130 may include: a housing 131 and activated carbon 132 .

Specifically, as shown in Figures 1 and 2, the upper end of the housing 131 (for example, the upper end of the housing 131 in Figure 2) can be formed with an activated carbon filter inlet 133 and the lower end of the housing 131 (for example, the lower end of the housing 131 in Figure 2 ) can be formed with an activated carbon filter outlet 134, and the activated carbon filter inlet 133 can be connected to the fine filter filter 120; the activated carbon 132 can be arranged at intervals between the activated carbon filter inlet 133 and the activated carbon filter outlet 134. Thus, the water flow filtered by the fine filter element 120 can enter the activated carbon filter element assembly 130 from the activated carbon filter element inlet 133, and flow out from the activated carbon filter element outlet 134 after being adsorbed by the activated carbon 132. The demand for watery taste.

As shown in FIG. 2 , a bracket 135 may be provided inside the casing 131 , activated carbon 132 may be disposed on the bracket 135 and close the inlet 133 of the activated carbon filter element, and a water passage 136 may be defined between the bracket 135 and the casing 131 .

Activated carbon 132 can be coconut shell activated carbon, etc., so that when filtering water, the natural taste factor can be retained, and trace elements can be adjusted, so that the taste of the water can be adjusted to better meet the needs of users.

Wherein, the bracket 135 can play a role of supporting the activated carbon 132, and the water flow through the activated carbon filter inlet 133 can be further purified under the action of the activated carbon 132, and the purified water can flow out through the water channel 136, so that it is convenient for the user to drink.

Referring to FIG. 2 , the bracket 135 may include: an annular side plate 137 and a bottom plate 138 .

Specifically, with reference to FIG. 2 and in conjunction with FIG. 1 , the annular side plate 137 can be connected to the bottom wall of the housing 131 and extend upwards, and the activated carbon filter element outlet 134 can be located inside the annular side plate 137 (for example, adjacent to the annular side plate 137 in FIG. 2 One side of the center), the annular side plate 137 can be spaced apart from the peripheral wall of the housing 131, and the lower end of the annular side plate 137 (for example, the lower end of the annular side plate 137 in FIG. Hole 139; Bottom plate 138 can be located in the annular side plate 137, and the periphery of bottom plate 138 can be connected with the inner peripheral surface of annular side plate 137, and the bottom surface of bottom plate 138 and shell 131 can be spaced apart, and through hole 139 can be formed in Below the base plate 138 .

As shown in FIG. 2 , the annular side plate 137 and the peripheral wall of the housing 131 can be spaced apart to form a water channel 136 , and the water filtered by the activated carbon filter element assembly 130 can flow out through the through hole 139 after passing through the water channel 136 , so that it is convenient for users to drink.

Referring to Fig. 2 and in conjunction with Fig. 1, the shell 131 may be provided with a first sleeve 101 connected to the periphery of the activated carbon filter inlet 133 and extending downwards, the lower end of the first sleeve 101 (for example, the first sleeve in Fig. 1 The lower end of the tube 101) may be provided with a limiting flange 102 extending inward. The water flow filtered by the fine filter element 120 can enter the activated carbon filter element assembly 130 from the activated carbon filter element inlet 133, and under the guidance of the first casing 101, the water flow entering the activated carbon filter element assembly 130 can be made more gentle, and the setting of the limit flange 102 The speed at which the water flow enters the activated carbon 132 can be appropriately slowed down, so as to ensure that the water flow can fully contact the activated carbon 132, thereby ensuring the quality of the effluent water and better meeting the needs of users.

As shown in Fig. 1 and Fig. 2, housing 131 can comprise loam cake 103 and base 104, and loam cake 103 can be covered on the base 104, and activated carbon filter element inlet 133 can be formed on the loam cake 103, and activated carbon filter element outlet 134 can form on the base 104. Thus, the water flow can enter the activated carbon filter element assembly 130 through the activated carbon filter element inlet 133 on the upper cover 103 in turn, and flow out through the activated carbon filter element outlet 134 on the base 104 after being purified by the activated carbon 132, so as to better meet the user's requirements for the quality of the effluent water. need.

1 and 2, the inner peripheral surface of the pretreatment filter element 110 can be provided with a mounting plate 105, the middle of the mounting plate 105 can be formed with a pure water port 106, and the mounting plate 105 can be provided with a ring surrounding the pure water port 106. The waste water port 107, the activated carbon filter element assembly 130 can be arranged on the mounting plate 105 and can be communicated with the pure water port 106, and the waste water passage connected to the waste water port 107 can be defined between the activated carbon filter element assembly 130 and the inner peripheral surface of the pretreatment filter element 110 108. As a result, not only can meet the needs of users for effluent water quality, but also realize the collection of waste water and protect the environment.

Further, referring to FIG. 2 , the mounting plate 105 may be provided with a second bushing 109 , and the second bushing 109 may be connected with the periphery of the pure water port 106 and extend downward. The water stream purified by the activated carbon filter element assembly 130 can smoothly flow out from the activated carbon filter element outlet 134 under the guidance of the second sleeve 109 , thereby ensuring the quality of the effluent water.

In combination with the above, the first sleeve 101 is sleeved inside the second sleeve 109, and the edge of the second sleeve 109 can be pressed against the flange 102 on the first sleeve 101, preferably the first sleeve 101 It is threadedly connected with the second casing 109.

Optionally, as shown in FIG. 1 , the upper and lower ends of the fine filter element 120 (for example, the upper end and the lower end of the fine filter element 120 in FIG. 1 ) can be connected to the top wall and the mounting plate 105 of the pretreatment filter element 110 respectively, and A sealing cup 111 may be provided between the lower end of the fine filter element 120 (for example, the lower end of the fine filter element 120 in FIG. 1 ) and the inner peripheral surface of the pretreatment filter element 110 . Thus, the sealing performance of the composite filter element 100 can be guaranteed, and the residual amount of water in the composite filter element 100 can be effectively reduced, so that the quality of the effluent water can be guaranteed, and the needs of users can be better met.

Further, referring to Fig. 1, the fine filter element 120 may include: a central water collection pipe 121 and a fine filtration membrane 122, the central water collection pipe 121 may extend along the up and down direction (for example, the up and down direction of the central water collection pipe 121 in Fig. The upper end of the water pipe 121 (for example, the upper end of the central water collection pipe 121 in FIG. 1 ) can be closed and connected to the top wall of the pretreatment filter element 110, and the lower end of the central water collection pipe 121 (for example, the lower end of the central water collection pipe 121 in FIG. 1 ) can be Open and connected to the mounting plate 105 and inserted into the pure water port 106, and a water collection hole 123 can be formed on the peripheral wall of the central water collection pipe 121; the fine filter membrane 122 can be sleeved on the outside of the central water collection pipe 121 and cover the water collection hole 123 . In this way, the water outlet speed can be properly adjusted while meeting the requirement of filtering the water.

In combination with the above, the lower end of the central water collecting pipe 121 is sheathed in the second casing 109 , and the lower edge of the central water collecting pipe 121 can be abutted against the flange 102 .

Wherein, the fine filter element 120 can be formed by rolling the fine filter membrane 122 around the central water collecting pipe 121 . Thereby, the utilization rate of the fine filter membrane 122 can be improved as much as possible.

The fine filter membrane 122 may be a reverse osmosis membrane (ie RO membrane, ReverseOsmosis membrane), an ultrafiltration membrane (ie UF membrane, ultrafiltration membrane) or a nanofiltration membrane (ie NF membrane, nanofiltration membrane).

Among them, the reverse osmosis membrane is a membrane separation and filtration technology that uses the osmotic pressure difference as the driving force. Ultrafiltration membrane is a pressure-driven membrane separation process that uses the interception capacity of porous materials to separate particulate matter from fluid and dissolved components. The typical pore size of the ultrafiltration membrane is between 0.01-0.1 microns, and it has a very high removal rate for bacteria and most viruses, colloids, sludge, etc. Nanofiltration membrane is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. The pore size of nanofiltration membrane is in the range of several nanometers. The utility model does not limit the specific form of the fine filter membrane 122, and it can be adaptively selected according to needs during practical application.

Referring to FIG. 1 , the pretreatment cartridge assembly 110 may include a pleated PP layer 112 that may be disposed upstream of the fine filter cartridge 120 in the direction of water flow. The membrane of the folded PP layer 112 has a large filtration area and strong dirt-holding capacity, and can retain impurities and dirt in the water, thereby protecting the fine filter element 120 and the activated carbon filter element assembly 130 to a certain extent.

Here, it should be noted that the folded PP layer 112 can be a separately selected and replaced part to be used as a spare part, and can be selectively installed according to the water quality, and the specific parameters of the folded PP layer 112 can also be selected according to different water qualities. adaptive selection.

As shown in FIG. 1 , the pretreatment filter element assembly 110 may include a PP non-woven fabric wrapping layer and an activated carbon fiber wrapping layer arranged sequentially along the water flow direction. Wherein, the PP non-woven winding layer can be wound on the outer side of the activated carbon fiber winding layer (for example, the side away from the center line of the composite filter element 100 in FIG. 1 ).

The filtration accuracy of the PP non-woven winding layer can be set to 5 μm, and the filtration accuracy of the folded PP layer 112 can be set to be greater than the filtration accuracy of the PP non-woven winding layer to ensure the filtering effect. In addition, the thickness of the filter element layer can also be set according to different regions and different water quality, so as to better meet the needs of users for water purification.

The composite filter element 100 is preferably applied to a large-flux water purification system.

In addition, the composite filter element 100 of the present invention is a large flux composite filter element, specifically, the water outlet speed of the composite filter element 100 is not less than 1L/min. That is to say, the use of a large-flux composite filter element can take in water and filter water immediately, avoiding the problem that the small-flux composite filter element needs to increase water storage equipment due to insufficient water production, thereby avoiding secondary pollution, and can pass through later. The installed activated carbon filter element assembly 130 improves the taste.

Wherein, the water outlet speed refers to the water treatment speed of the composite filter element 100, that is to say, the composite filter element 100 can produce at least 1L of pure water per minute under the condition of proper water inlet pressure.

Referring to FIGS. 1 to 4 , the composite filter element assembly 200 according to the second embodiment of the present invention includes a filter bottle 210 , a composite filter element 100 , a filter bottle cap 220 and a pressure ring 230 .

Specifically, the filter bottle 210 can be in the shape of an open upper end (for example, the upper end of the filter bottle 210 in FIG. 4 ) and a closed lower end (for example, the lower end of the filter bottle 210 in FIG. 4 ); In the filter bottle 210, the composite filter element can be the above-mentioned composite filter element 100, and the filter bottle cap 220 can be arranged on the upper end of the filter bottle 210 to open or close the upper end of the filter bottle 210, and the filter bottle 210 can compress the composite filter element 100; It is detachably connected with the filter bottle 210 and the filter bottle cap 220 is compressed.

Referring to FIG. 4 , the composite filter element 100 can also include a handle 201. When the composite filter element 100 needs to be replaced, the composite filter element 100 can be taken out through the handle 201 and replaced with a new composite filter element. The replacement process is convenient and fast.

In addition, the utility model also proposes a water purification system, which includes a composite filter element assembly 200, and the pure water outlet of the composite filter element 200 is sequentially connected to a high-voltage switch and a water supply faucet. However, the water outlet of the composite filter element 200 is not connected to a water outlet container such as a water storage tank.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components , unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (13)

1. A composite filter element, characterized in that, comprising: the composite filter element includes a pretreatment filter element assembly, a fine filter element assembly and an activated carbon filter element assembly arranged in sequence along the water flow direction, the pretreatment filter element assembly, the fine filter element assembly The assembly is connected to the activated carbon filter element assembly. 2. The composite filter element according to claim 1, wherein the pretreatment filter element assembly is in the shape of a straight cylinder with a closed upper end and an open lower end, and the fine filter element assembly and the activated carbon filter element assembly are arranged along the The axial direction of the assembly is sequentially arranged inside the pretreatment filter element assembly from top to bottom. 3. The composite filter element according to claim 2, wherein the activated carbon filter element assembly comprises: A shell, the upper end of the shell is formed with an activated carbon filter inlet and the lower end is formed with an activated carbon filter outlet, and the activated carbon filter inlet is connected to the fine filter element; activated carbon, and the activated carbon is spaced between the inlet of the activated carbon filter element and the outlet of the activated carbon filter element. 4. The composite filter element according to claim 3, wherein a bracket is provided in the housing, the activated carbon is arranged on the bracket and closes the inlet of the activated carbon filter element, and the gap between the bracket and the housing is Define the water passage. 5. The composite filter element according to claim 4, wherein the support comprises: An annular side plate, the annular side plate is connected to the bottom wall of the housing and extends upward, the outlet of the activated carbon filter element is located inside the annular side plate, the annular side plate is spaced from the peripheral wall of the housing, and the The lower end of the annular side plate is formed with a through hole communicating with the outlet of the activated carbon filter element; a bottom plate, the bottom plate is arranged in the annular side plate, and the periphery of the bottom plate is connected with the inner peripheral surface of the annular side plate, the bottom plate is spaced apart from the bottom surface of the shell, and the through hole formed below the bottom plate. 6. The composite filter element according to claim 3, characterized in that, the housing is provided with a first sleeve connected to the periphery of the inlet of the activated carbon filter element and extending downwards, the lower end of the first sleeve There is a limiting flange extending inward. 7. The composite filter element according to claim 3, wherein the housing comprises a loam cake and a base, the loam cake is set on the pedestal, and the inlet of the activated carbon filter element is formed on the loam cake, And the outlet of the activated carbon filter element is formed on the base. 8. The composite filter element according to any one of claims 2-7, characterized in that, the inner peripheral surface of the pretreatment filter element is provided with a mounting plate, the middle part of the mounting plate is formed with a pure water port, and The installation plate is provided with a waste water port surrounding the pure water port, the activated carbon filter element assembly is arranged on the installation plate and communicated with the pure water port, and the activated carbon filter element assembly is connected to the pretreatment filter element A waste water channel communicating with the waste water port is defined between the inner peripheral surfaces of the waste water. 9 . The composite filter element according to claim 8 , wherein a second sleeve is provided on the mounting plate, and the second sleeve is connected with the periphery of the pure water port and extends downward. 10. The composite filter element according to claim 8, wherein the upper and lower ends of the fine filter element are respectively connected to the top wall of the pretreatment filter element and the mounting plate, and the lower end of the fine filter element is A sealing cup is provided between the inner peripheral surface of the pretreatment filter element. 11. The composite filter element according to claim 10, wherein the fine filter element comprises: A central water collection pipe, the central water collection pipe extends along the up and down direction, the upper end of the central water collection pipe is closed and connected with the top wall of the pretreatment filter element, the lower end of the central water collection pipe is open and connected with the installation plate and inserted into the pure water port, and a water collecting hole is formed on the peripheral wall of the central water collecting pipe; A fine filter membrane, the fine filter membrane is sleeved on the outside of the central water collection pipe and covers the water collection hole. 12. The composite filter element according to claim 1, characterized in that, the water outlet speed of the composite filter element is not less than 1 L/min. 13. A composite filter element assembly, characterized in that, comprising: A filter bottle, the filter bottle is open at the upper end and closed at the lower end; A composite filter element, the composite filter element is detachably and removably arranged in the filter bottle, and the composite filter element is the composite filter element according to any one of claims 1-12; A filter bottle cap, the filter bottle cap is arranged on the upper end of the filter bottle for opening or closing the upper end of the filter bottle, and the filter bottle compresses the composite filter element; A pressure ring, the pressure ring is detachably connected with the filter bottle and compresses the filter bottle cap.