Membrane element, filter element and water purification system

Abstract

The utility model discloses a membrane element, a filter element and a water purification system, the membrane element comprises a water collecting pipe, a water inlet pipe, a water outlet pipe and a water outlet pipe, the first membrane unit and the second membrane unit are wound on the periphery of the water collecting pipe; the first water inlet is used for introducing raw water into the first membrane unit; the second water inlet is used for introducing raw water into the second membrane unit; the first water inlet and the second water inlet are positioned at different positions of the membrane unit; the purified water port is used for leading out purified water in the first membrane unit and the second membrane unit, and the purified water port is communicated with the opening; and the wastewater port is used for leading out wastewater in the first membrane unit and the second membrane unit. According to the application, the same membrane element can be utilized to realize the output of various different water qualities and / or flows.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a membrane element, a filter element and a water purification system. Background Art

[0002] As people's living standards improve, more and more people begin to pay attention to the quality of water in their lives, so various water purification equipment has emerged. At present, water purification equipment usually uses filters to treat tap water to obtain clean water for people to use.

[0003] In water purification equipment, the filter element is used as a core component to filter water. The filter element is classified according to the filtration accuracy of the filter material. The existing filter elements are divided into coarse filtration, microfiltration, ultrafiltration, nanofiltration and reverse osmosis. Coarse filtration is generally a pre-filter of a stainless steel mesh, and its filtration accuracy is about 30 to 40 microns, which can only filter out mud, rust and insect eggs. Microfiltration is generally a ceramic filter element or a pp cotton filter element, and its filtration accuracy is 1 to 20 microns, which can filter out some bacteria and organic matter. When microfiltration and activated carbon are combined together, they can also absorb residual chlorine, color and turbidity in tap water, and are generally used as pre- or tap water purifiers. The filtration accuracy of ultrafiltration is about 0.01 microns, which can filter out bacteria, organic matter and some viruses and heavy metals in water. The filtration accuracy of nanofiltration is about 0.001 microns. In addition to filtering out bacteria, viruses, organic matter, it can also filter out some antibiotics, inorganic matter and heavy metals. The filtration accuracy of reverse osmosis is about 0.0001 microns, which can filter out all harmful substances and inorganic minerals in the water, and only retain a very small amount of trace elements with a diameter of less than 0.0001 microns. The output water can be drunk directly.

[0004] In order to improve the water purification effect, existing water purification equipment usually uses a combination of multi-stage filter elements with different filtration accuracies to process water. When multi-stage filter elements with different filtration accuracies are integrated into a housing to form a composite filter element, the filtration accuracy of the composite filter element for water depends on the filter module with the highest filtration accuracy. However, as people pay more attention to the health of drinking water, different people have different requirements for the mineral content in purified water, and the above-mentioned composite filter element cannot meet the needs of multiple users at the same time.

[0005] Therefore, it is necessary to propose a membrane element, a filter element and a water purification system to solve the above problems. Utility Model Content

[0006] In view of the defects existing in the prior art, the embodiments of the present invention provide a membrane element, a filter element and a water purification system, which can achieve the output of a variety of different water qualities and / or flow rates by using the same membrane element.

[0007] The specific technical solution of the implementation mode of the utility model is:

[0008] A membrane element, the membrane element comprising: a water collecting pipe, the water collecting pipe having an opening on its wall; a first membrane unit and a second membrane unit wound around the water collecting pipe; a first water inlet for introducing raw water into the first membrane unit; a second water inlet for introducing raw water into the second membrane unit; the first water inlet and the second water inlet are located at different positions of the membrane units; a clean water outlet for exporting clean water from the first membrane unit and the second membrane unit, the clean water outlet being connected to the opening; and a waste water outlet for exporting waste water from the first membrane unit and the second membrane unit.

[0009] In a preferred embodiment, the membrane element, in the unfolded state, has a first side connected to the opening of the water collecting pipe, the clean water outlet is located on the first side, a second side opposite to the first side, a third side between the first side and the second side, a fourth side opposite to the third side, and the wastewater outlet, the first water inlet and the second water inlet are respectively located on the second side, the third side and the fourth side.

[0010] In a preferred embodiment, the first membrane unit is provided with a first wastewater port for discharging wastewater, the second membrane unit is provided with a second wastewater port for discharging wastewater, and the first wastewater port and the second wastewater port are located on the same side of the membrane element to form the wastewater port; the first membrane unit is provided with a first water outlet for discharging clean water, the second membrane unit is provided with a second water outlet for discharging clean water, and the first water outlet and the second water outlet are located on the first side to form the clean water port.

[0011] In a preferred embodiment, the first water inlet is arranged on the second side, and the wastewater outlet and the second water inlet are arranged either on the third side or the fourth side.

[0012] In a preferred embodiment, the first membrane unit in the unfolded state includes: a first side connected to the water collecting pipe, a second side opposite to the first side, a third side located between the first side and the second side, a fourth side opposite to the third side, the first water inlet located on the second side, and the first wastewater outlet located on the third side or the fourth side; the second membrane unit in the unfolded state includes: a fifth side connected to the water collecting pipe, a sixth side opposite to the fifth side, a seventh side located between the fifth side and the sixth side, an eighth side opposite to the seventh side, the second water inlet and the second wastewater outlet are selectively located on the eighth side and the seventh side; the first side and the fifth side are both located on the first side; the third side and the seventh side are both located on the third side, and the fourth side and the eighth side are both located on the fourth side.

[0013] In a preferred embodiment, the second side is an open side, used to form the first water inlet, the third side has an opening reserved near the water collecting pipe side, and the opening is used to form the first wastewater outlet; the fourth side is a blocked side; the sixth side is a blocked side, and the seventh side and the eighth side are open sides, used to form the second water inlet and the second wastewater outlet, respectively.

[0014] In a preferred embodiment, the wastewater inlet is arranged on the second side, and the first water inlet and the second water inlet are arranged alternatively on the third side and the fourth side.

[0015] In a preferred embodiment, the first membrane unit in the unfolded state includes: a first side connected to the water collecting pipe, a second side opposite to the first side, a third side located between the first side and the second side, a fourth side opposite to the third side, the first wastewater outlet is located on the second side, and the first water inlet is located on the third side or the fourth side; the second membrane unit in the unfolded state includes: a fifth side connected to the water collecting pipe, a sixth side opposite to the fifth side, a seventh side located between the fifth side and the sixth side, an eighth side opposite to the seventh side, the second wastewater outlet is located on the sixth side, and the second water inlet is located on the eighth side or the seventh side; the first side and the fifth side are both located on the first side; the third side and the seventh side are both located on the third side, and the fourth side and the eighth side are both located on the fourth side.

[0016] In a preferred embodiment, the second side is an open side for forming the first wastewater outlet, the third side is reserved with an opening near the water collecting pipe side, and the opening is used to form the first water inlet; the sixth side is an open side for forming the second wastewater outlet, and the eighth side is reserved with an opening near the water collecting pipe side, and the opening is used to form the second water inlet.

[0017] In a preferred embodiment, the second membrane unit and the first membrane unit are stacked up and down as a whole and then wound outside the water collecting pipe; or, the first membrane unit includes multiple layers of first membrane pages, and the second membrane unit includes multiple layers of second membrane pages, and the multiple layers of the first membrane pages and the multiple layers of the second membrane pages are alternately stacked in the stacking direction and then wound outside the water collecting pipe.

[0018] In a preferred embodiment, the first membrane unit and the second membrane unit are membrane units of the same type; or, the first membrane unit and the second membrane unit are membrane units of different types; the first membrane unit and the second membrane unit respectively include any one of the following: a reverse osmosis membrane unit, a nanofiltration membrane unit, an ultrafiltration membrane unit, and a microfiltration membrane unit.

[0019] A filter element comprises any one of the membrane elements described above.

[0020] In a preferred embodiment, the filter element also includes a shell for accommodating the membrane element, and the shell is provided with a clean water outlet connected to the water collecting pipe; a wastewater outlet connected to the wastewater outlet; a first water inlet connected to the first water inlet; and a second water inlet connected to the second water inlet.

[0021] In a preferred embodiment, the first membrane unit is located on a first water flow path between the first water inlet and the clean water outlet; the second membrane unit is located on a second water flow path between the second water inlet and the clean water outlet.

[0022] In a preferred embodiment, the filter element is provided with a first water inlet channel for connecting the first water inlet with the first water inlet, a second water inlet channel for connecting the second water inlet with the second water inlet, a clean water channel for connecting the clean water port with the clean water outlet, and a wastewater channel for connecting the wastewater port with the wastewater outlet.

[0023] In a preferred embodiment, the shell includes a bottle body and a bottle cap, and the filter element also includes a center tube, a first membrane end cap and a second membrane end cap arranged at both ends of the membrane element, the center tube is located in the water collecting pipe, the center tube has a first end close to the first membrane end cap and a second end close to the second membrane end cap, and the center tube is sealed with the bottle cap near the first end; a first opening connected to the first water inlet is formed on the first membrane end cap; the bottle cap and the first membrane end cap cooperate to form the first water inlet channel; the bottle cap, the center tube and the second membrane end cap cooperate to form the second water inlet channel; the center tube, the water collecting pipe and the bottle cap cooperate to form the clean water channel; the shell and the first membrane end cap cooperate to form the wastewater channel.

[0024] In a preferred embodiment, the shell includes a bottle body and a bottle cap, and the filter element also includes a center tube, a first membrane end cap and a second membrane end cap arranged at both ends of the membrane element, the center tube is located in the water collecting pipe, the center tube has a first end close to the bottle cap and a second end away from the bottle cap, and the center tube is sealed with the bottle cap near the first end; a first opening connected to the wastewater outlet is formed on the first membrane end cap; the shell and the first membrane end cap cooperate to form the first water inlet channel; the bottle cap, the center tube and the second membrane end cap cooperate to form the second water inlet channel; the center tube, the water collecting pipe and the bottle cap cooperate to form the clean water channel; the bottle cap and the first membrane end cap cooperate to form the wastewater channel.

[0025] In a preferred embodiment, the filter element also includes a shell for accommodating the membrane element, and the shell is provided with a clean water outlet connected to the water collecting pipe; a wastewater outlet connected to the wastewater outlet; and a water inlet connected to the first water inlet and the second water inlet.

[0026] A water purification system comprises any one of the filter elements described above.

[0027] In a preferred embodiment, the water purification system further comprises: a control valve disposed upstream of the filter element, the control valve being used to control the communication relationship between the raw water input from the outside and the filter element, and when the control valve connects the first water inlet with the raw water input from the outside, the purified water outlet can output the first purified water;

[0028] When the control valve connects the second water inlet with raw water input from the outside, the purified water outlet can output second purified water;

[0029] When the control valve connects the first water inlet and the second water inlet to raw water input from the outside, the clean water outlet can output third clean water; the water quality and / or flow rate of the first clean water, the second clean water and the third clean water are different.

[0030] In a preferred embodiment, the control valve is a three-way valve, or the control valve includes a first solenoid valve and a second solenoid valve.

[0031] The technical solution of the utility model has the following significant beneficial effects:

[0032] The membrane element provided in the embodiment of the present application, through the first membrane unit and the second membrane unit wound outside the water collecting pipe, uses the first water inlet and the second water inlet located at different positions, and can input raw water to the first water inlet and / or the second water inlet of the membrane element according to the user's water demand, so as to filter the raw water using the first membrane unit and / or the second membrane unit, and output the clean water using the clean water outlet at the same position, and output the waste water using the waste water outlet at the same position, thereby obtaining clean water with water quality and / or flow rate that meets the user's needs. On the whole, the present application can achieve water purification of various water qualities and / or flow rates only by forming a membrane element by stacking and rolling the first membrane unit and the second membrane unit. Compared with the existing form of installing membrane units with different functions at different positions and then sealing and separating them by an isolation structure, the present application has a simple structure, low production cost, and significant advantages.

[0033] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0035] Figure 1 A schematic diagram of the structure of a membrane element after overall unfolding provided in an embodiment of the present application;

[0036] Figure 2 This is a schematic structural diagram of a first membrane unit of a membrane element provided in an embodiment of the present application after being unfolded;

[0037] Figure 3 A schematic diagram of the structure of a second membrane unit of a membrane element provided in an embodiment of the present application after being unfolded;

[0038] Figure 4 A schematic diagram of the structure of another membrane element provided in an embodiment of the present application after the first membrane unit is unfolded;

[0039] Figure 5 A schematic diagram of the structure of another membrane element provided in an embodiment of the present application after the second membrane unit is unfolded;

[0040] Figure 6 A schematic diagram of the structure of a filter element provided in an embodiment of the present application;

[0041] Figure 7 for Figure 6 Sectional view at AA in the middle;

[0042] Figure 8 A schematic diagram of the structure of a filter element provided in an embodiment of the present application;

[0043] Fig. 9 for Figure 8 Sectional view at the middle BB;

[0044] Fig.10 This is a schematic diagram of a water purification system provided in an embodiment of the present application.

[0045] Reference numerals of the present application:

[0046] 1. Water collecting pipe;

[0047] 11. First side;

[0048] 12. Second side;

[0049] 13. Third side;

[0050] 14. Fourth side;

[0051] 2. The first membrane unit;

[0052] 21. First water inlet;

[0053] 22. The first wastewater outlet;

[0054] 23. First water outlet;

[0055] 25. first side;

[0056] 26. Second side;

[0057] 27. The third side;

[0058] 28. Fourth side;

[0059] 3. The second membrane unit;

[0060] 31. Second water inlet;

[0061] 32. Second wastewater outlet;

[0062] 33. Second water outlet;

[0063] 35. Fifth side;

[0064] 36. Sixth side;

[0065] 37. Seventh side;

[0066] 38. Eighth side;

[0067] 4. Shell;

[0068] 41. Bottle body;

[0069] 42. Bottle cap;

[0070] 421. Clean water outlet;

[0071] 422. Wastewater outlet;

[0072] 423, first water inlet;

[0073] 424, second water inlet;

[0074] 5. Center tube;

[0075] 6. First membrane end cap;

[0076] 61. First opening;

[0077] 7. Second membrane end cap;

[0078] 81. First solenoid valve;

[0079] 82. Second solenoid valve. DETAILED DESCRIPTION

[0080] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

[0081] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0082] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0083] The utility model provides a membrane element, a filter element and a water purification system, which can realize the output of a plurality of different water qualities and / or flow rates by using the same membrane element.

[0084] Please refer to Figures 1 to 5 In an embodiment of the present application specification, a membrane element is provided, which may include: a water collecting pipe 1, wherein an opening is provided on the pipe wall of the water collecting pipe 1; a first membrane unit 2 and a second membrane unit 3 wound around the periphery of the water collecting pipe 1; a first water inlet 21 for introducing raw water into the first membrane unit 2; a second water inlet 31 for introducing raw water into the second membrane unit 3; the first water inlet 21 and the second water inlet 31 are located at different positions of the membrane unit; a clean water inlet for exporting clean water from the first membrane unit 2 and the second membrane unit 3, the clean water inlet being connected to the opening; a waste water inlet for exporting waste water from the first membrane unit 2 and the second membrane unit 3.

[0085] In the application implementation, the membrane element may mainly include: a water collecting pipe 1 , a first membrane unit 2 and a second membrane unit 3 wound around the water collecting pipe 1 .

[0086] The water collecting pipe 1 can be a hollow pipe as a whole, and an opening for receiving the purified water after being purified by the first membrane unit 2 and the second membrane unit 3 is provided on the pipe wall.

[0087] The first film unit 2 may include at least one first film sheet, and the second film unit 3 may include at least one second film sheet.

[0088] In one embodiment, the second membrane unit 3 and the first membrane unit 2 can be stacked up and down as a whole and then wound outside the water collecting pipe 1, so that the preparation process of the membrane element is simple without adding too many additional processing steps.

[0089] Alternatively, in another embodiment, when the first membrane unit 2 may include multiple layers of first membrane pages and the second membrane unit 3 may include multiple layers of second membrane pages, the multiple layers of the first membrane pages and the multiple layers of the second membrane pages may be alternately stacked in a stacking direction and then wound outside the water collecting pipe 1.

[0090] The first membrane unit 2 and the second membrane unit 3 are membrane units of the same type; or, the first membrane unit 2 and the second membrane unit 3 are membrane units of different types.

[0091] Specifically, the first membrane unit 2 may include any one of the following: a reverse osmosis membrane unit, a nanofiltration membrane unit, an ultrafiltration membrane unit, and a microfiltration membrane unit.

[0092] Specifically, the second membrane unit 3 may include any one of the following: a reverse osmosis membrane unit, a nanofiltration membrane unit, an ultrafiltration membrane unit, and a microfiltration membrane unit.

[0093] In the embodiment of the present application, the membrane sheet materials of the first membrane unit 2 and the second membrane unit 3 can be the same, or of course different. For example, when the first membrane unit 2 and the second membrane unit 3 are the same type of membrane units, the first membrane unit 2 and the second membrane unit 3 can both be reverse osmosis membranes, that is, the first membrane unit 2 and the second membrane unit 3 can both be reverse osmosis membrane units, so that the membrane element is used as the core component of the filter element to filter the water entering the membrane element with high quality to output clean water of different flow rates.

[0094] When the first membrane unit 2 and the second membrane unit 3 are different types of membrane units, for example, the first membrane unit 2 can be a reverse osmosis membrane unit, and the second membrane unit 3 can be a nanofiltration membrane unit, so that the membrane element can be used to perform different levels of filtration on the water entering the membrane element to output clean water of different water qualities.

[0095] The number of membrane sheets of the first membrane unit 2 and the second membrane unit 3 may be the same or different. The sizes of membrane sheets of the first membrane unit 2 and the second membrane unit 3 may be the same or different.

[0096] Among them, the first membrane unit 2 can be specifically in the form of a lateral flow membrane, the second membrane unit 3 can also be in the form of a lateral flow membrane, or the second membrane unit 3 can be any one of the following: multiple membrane pages, single-page folded film, M-type folded film, etc.

[0097] Of course, the specific configuration of the first membrane unit 2 and the second membrane unit 3 may also be other methods and are not limited to the above description. Technical personnel in the relevant field may make other changes inspired by the technical essence of the present application. However, as long as the functions and effects achieved are the same or similar to those of the present application, they should be covered within the scope of protection of the present application.

[0098] In this embodiment, the membrane element is provided with a first water inlet 21 for introducing raw water into the first membrane unit 2, and the first water inlet 21 is provided on the first membrane unit 2; the membrane element is also provided with a second water inlet 31 for introducing raw water into the second membrane unit 3, and the second water inlet 31 is provided on the second membrane unit 3, and the first water inlet 21 and the second water inlet 31 are located at different positions of the membrane unit. For example, when the membrane unit is in the unfolded state, the first water inlet 21 and the second water inlet 31 can be located on different sides of the membrane unit, so that when the user needs water of different water quality or flow rate, the connection relationship between the raw water and the first water inlet 21 and the second water inlet 31 at the corresponding position can be selected according to the user's needs, and then the corresponding membrane unit can be selected to filter the raw water.

[0099] When raw water only flows into the first water inlet 21, the first membrane unit 2 is used to filter the raw water; when raw water only flows into the second water inlet 31, the second membrane unit 3 is used to filter the raw water; when raw water flows into the first water inlet 21 and the second water inlet 31 at the same time, the first membrane unit 2 and the second membrane unit 3 are used to filter the raw water at the same time.

[0100] The membrane element is provided with a clean water outlet for exporting the clean water in the first membrane unit 2 and the second membrane unit 3. The clean water outlet is connected to the opening of the water collecting pipe 1. The clean water filtered by the first membrane unit 2 and / or the second membrane unit 3 in the membrane element can flow into the water collecting pipe 1 through the opening and then be exported.

[0101] The membrane element is provided with a wastewater outlet for discharging wastewater from the first membrane unit 2 and the second membrane unit 3. The first membrane unit 2 and the second membrane unit 3 are respectively provided with wastewater outlets, and the positions of the wastewater outlets on the first membrane unit 2 and the second membrane unit 3 are the same or close. For example, when the membrane element is in the unfolded state, the wastewater outlets of the first membrane unit 2 and the second membrane unit 3 are located on the same side, so that the first membrane unit 2 and the second membrane unit 3 of the membrane element can discharge wastewater at the same position.

[0102] The membrane element provided in the embodiment of the present application, through the first membrane unit 2 and the second membrane unit 3 wound outside the water collecting pipe 1, can input raw water to the first water inlet 21 and / or the second water inlet 31 of the membrane element according to the user's water demand by using the first water inlet 21 and the second water inlet 31 located at different positions, so as to filter the raw water by using the first membrane unit 2 and / or the second membrane unit 3, and output the clean water by using the clean water outlet at the same position, and output the waste water by using the waste water outlet at the same position, so as to obtain clean water of water quality and / or flow rate that meets the user's needs. On the whole, the present application can achieve water purification of various water qualities and / or flow rates only by forming a membrane element by stacking and rolling the first membrane unit 2 and the second membrane unit 3. Compared with the existing form of installing membrane units with different functions at different positions and then sealing and separating them by an isolation structure, the present application has a simple structure, low production cost and significant advantages.

[0103] The present application will be described in detail below with reference to specific drawings and implementation methods.

[0104] like Figure 1 As shown, in some embodiments, the membrane element, in the unfolded state, has a first side 11 connected to the opening of the water collecting pipe 1, the clean water outlet is located on the first side 11, a second side 12 opposite to the first side 11, a third side 13 between the first side 11 and the second side 12, a fourth side 14 opposite to the third side 13, and the wastewater outlet, the first water inlet 21 and the second water inlet 31 are respectively located on the second side 12, the third side 13 and the fourth side 14.

[0105] In this embodiment, the membrane element can be rectangular in the plane when it is in the unfolded state. The examples and drawings in the embodiments of this application are mainly described based on the membrane element being rectangular in the unfolded state. Of course, it is not excluded that the membrane element can be in other structures. When the membrane element is in other structures, it can be inferred by reference to this application, and this application will not be described one by one here.

[0106] Specifically, the side of the membrane element that is connected to the opening of the water collecting pipe 1 is the first side 11, and the membrane element also has a second side 12 opposite to the first side 11, and a third side 13 and a fourth side 14 located between the first side 11 and the second side 12. The first side 11, the third side 13, the second side 12 and the fourth side 14 form a closed outline of the membrane element.

[0107] The clean water outlet of the membrane element is located on the first side 11, and the membrane element is connected to the water collecting pipe 1, so that the clean water filtered by the membrane element can be discharged from the water collecting pipe 1. In addition, the wastewater outlet and the first water inlet 21 and the second water inlet 31 can be located on different sides. Specifically, the wastewater outlet and the first water inlet 21 and the second water inlet 31 can be located on the second side 12, the third side 13 and the fourth side 14 respectively. For example, Figure 2 and Figure 3 As shown, the first water inlet 21 can be arranged on the second side 12, and the wastewater outlet and the second water inlet 31 can be arranged on the third side 13 and the fourth side 14. Figure 4 and Figure 5 As shown, the first wastewater outlet 22 and the second wastewater outlet 32 ​​are both arranged on the second side 12 , and the first water inlet 21 and the second water inlet 31 are alternatively arranged on the third side 13 and the fourth side 14 .

[0108] Specifically, the first membrane unit 2 is provided with a first wastewater outlet 22 for draining wastewater, and the second membrane unit 3 is provided with a second wastewater outlet 32 ​​for draining wastewater, and the first wastewater outlet 22 and the second wastewater outlet 32 ​​are located on the same side of the membrane element to form the wastewater outlet. When the first wastewater outlet 22 of the first membrane unit 2 and the second wastewater outlet 32 ​​of the second membrane unit 3 are located on the same side of the membrane element, a common wastewater outlet can be formed, which is conducive to simplifying the structure of the membrane element.

[0109] The first membrane unit 2 is provided with a first water outlet 23 for exporting clean water, and the second membrane unit 3 is provided with a second water outlet 33 for exporting clean water, and the first water outlet 23 and the second water outlet 33 are located on the first side 11 to form the clean water outlet. When the first water outlet 23 of the first membrane unit 2 and the second water outlet 33 of the second membrane unit 3 are located on the same side, a common clean water outlet can be formed, which is also conducive to simplifying the structure of the membrane element.

[0110] like Figure 2 and Figure 3 As shown, in one embodiment, the first water inlet 21 is arranged on the second side 12, and the wastewater port and the second water inlet 31 are arranged on the third side 13 and the fourth side 14. For example, when the wastewater port is arranged on the third side 13, the second water inlet 31 is arranged on the fourth side 14; or, when the wastewater port is arranged on the fourth side 14, the second water inlet 31 is arranged on the third side 13.

[0111] like Figure 2As shown, the first membrane unit 2 in the unfolded state includes: a first side 25 connected to the water collecting pipe 1, a second side 26 opposite to the first side 25, a third side 27 located between the first side 25 and the second side 26, and a fourth side 28 opposite to the third side 27. The first water inlet 21 can be located at the second side 26, and the first wastewater outlet 22 is located at the third side 27 or the fourth side 28.

[0112] like Figure 3 As shown, the second membrane unit 3 in the unfolded state includes: a fifth side 35 connected to the water collecting pipe 1, a sixth side 36 opposite to the fifth side 35, a seventh side 37 located between the fifth side 35 and the sixth side 36, and an eighth side 38 opposite to the seventh side 37. The second water inlet 31 and the second wastewater outlet 32 ​​are located at either the eighth side 38 or the seventh side 37.

[0113] The first side edge 25 and the fifth side edge 35 are both located on the first side 11 ; the third side edge 27 and the seventh side edge 37 are both located on the third side 13 ; the fourth side edge 28 and the eighth side edge 38 are both located on the fourth side 14 .

[0114] The first side 25 and the second side 26 may be opposite short sides, and their extension direction may be consistent with the extension direction of the water collecting pipe 1. The third side 27 and the fourth side 28 may be opposite long sides, and their extension direction may form a certain angle with the extension direction of the water collecting pipe 1. For example, when the angle is 90°, the two sets of side edges are in a vertical relationship.

[0115] In this embodiment, the length of the second membrane unit 3 in the direction perpendicular to the water collecting pipe 1 can be less than the length of the first membrane unit 2 in the direction perpendicular to the water collecting pipe 1. That is, the length of the third side 27 or the fourth side 28 is greater than the length of the seventh side 37 or the eighth side 38. Among them, the extension direction of the fifth side 35 and the sixth side 36 can be consistent with the extension direction of the water collecting pipe 1. The extension direction of the seventh side 37 and the eighth side 38 can be at a certain angle to the extension direction of the water collecting pipe 1. For example, when the angle is 90°, the two sets of sides are in a vertical relationship.

[0116] Specifically, the second side 26 of the first membrane unit 2 is an open side, which is used to form the first water inlet 21. The third side 27 is reserved with an opening near the water collecting pipe 1, and the opening is used to form the first wastewater outlet 22. The fourth side 28 is a blocked side. The sixth side 36 is a blocked side. The seventh side 37 and the eighth side 38 are open sides, which are used to form the second wastewater outlet 32 ​​and the second water inlet 31, respectively. Among them, the third side 27 of the first membrane unit 2 is not sealed between the two membrane sheets near the water collecting pipe 1 to form the above-mentioned opening. Other positions of the third side 27 are sealed.

[0117] like Figure 4 and Figure 5 As shown, the wastewater inlet is arranged on the second side 12, and the first water inlet 21 and the second water inlet 31 are arranged on the third side 13 and the fourth side 14. For example, when the first water inlet 21 is arranged on the third side 13, the second water inlet 31 is arranged on the fourth side 14; or, when the first water inlet 21 is arranged on the fourth side 14, the second water inlet 31 is arranged on the third side 13.

[0118] like Figure 4 As shown, the first membrane unit 2 in the unfolded state includes: a first side 25 connected to the water collecting pipe 1, a second side 26 opposite to the first side 25, a third side 27 located between the first side 25 and the second side 26, a fourth side 28 opposite to the third side 27, the first wastewater outlet 22 is located on the second side 26, and the first water inlet 21 is located on the third side 27 or the fourth side 28.

[0119] like Figure 5 As shown, the second membrane unit 3 in the unfolded state includes: a fifth side 35 connected to the water collecting pipe 1, a sixth side 36 opposite to the fifth side 35, a seventh side 37 located between the fifth side 35 and the sixth side 36, an eighth side 38 opposite to the seventh side 37, the second wastewater port 32 is located on the sixth side 36, and the second water inlet 31 is located on the eighth side 38 or the seventh side 37.

[0120] The first side 25 and the fifth side 35 are both located on the first side; the third side 27 and the seventh side 37 are both located on the third side; the fourth side 28 and the eighth side 38 are both located on the fourth side.

[0121] Among them, in this embodiment, the main difference from the above embodiment is that the lengths of the first membrane unit 2 and the second membrane unit 3 in the direction perpendicular to the water collecting pipe 1 can be equal or close.

[0122] For the first membrane unit 2, the first side 25 and the second side 26 may be relative short sides, and their extension direction may be consistent with the extension direction of the water collecting pipe 1. The third side 27 and the fourth side 28 may be relative long sides, and their extension direction may form a certain angle with the extension direction of the water collecting pipe 1. For example, when the angle is 90°, the two sets of side edges are in a vertical relationship.

[0123] For the second membrane unit 3, the fifth side 35 and the sixth side 36 may be opposite short sides, and their extension direction may be consistent with the extension direction of the water collecting pipe 1. The seventh side 37 and the eighth side 38 may be opposite long sides, and their extension direction may form a certain angle with the extension direction of the water collecting pipe 1. For example, when the angle is 90°, the two sets of side edges are in a vertical relationship.

[0124] Specifically, the second side 26 is an open side for forming the first wastewater outlet 22, and the third side 27 is reserved with an opening near the water collecting pipe 1, and the opening is used to form the first water inlet 21; the sixth side 36 is an open side for forming the second wastewater outlet 32, and the eighth side 38 is reserved with an opening near the water collecting pipe 1, and the opening is used to form the second water inlet 31.

[0125] The third side 27 of the first membrane unit 2 is not sealed between the two membrane sheets near the water collecting pipe 1 to form the above-mentioned opening. The other positions of the third side 27 are sealed. The eighth side 38 of the second membrane unit 3 is not sealed between the two membrane sheets near the water collecting pipe 1 to form the above-mentioned opening. The other positions of the eighth side 38 are sealed.

[0126] A filter element is also provided in an embodiment of the present application, and the filter element mainly includes the above-mentioned membrane element. The filter element can achieve the technical effect achieved by the membrane element embodiment by setting the membrane element. For details, please refer to the specific description of the above-mentioned embodiment, and the present application will not repeat it here.

[0127] Please refer to Figures 6 to 9 In some embodiments, the filter element also includes a shell 4 for accommodating the membrane element, and the shell 4 is provided with a clean water outlet 421 connected to the water collecting pipe 1; a wastewater outlet 422 connected to the wastewater outlet; a first water inlet 423 connected to the first water inlet 21; and a second water inlet 424 connected to the second water inlet 31.

[0128] In this embodiment, the housing 4 includes a filter bottle with an opening and a bottle cap 42 disposed at the opening of the filter bottle, and the bottle cap 42 is disposed near the water outlet end of the water collecting pipe 1. The wastewater outlet 422, the first water inlet 423, the second water inlet 424 and the clean water outlet 421 can all be disposed on the bottle cap 42.

[0129] In one embodiment, the first membrane unit 2 is located on a first water flow path between the first water inlet 21 and the purified water outlet 421; the second membrane unit 3 is located on a second water flow path between the second water inlet 31 and the purified water outlet 421. The first water flow path and the second water flow path are relatively independent, thereby ensuring that raw water can enter the corresponding membrane unit according to different water quality and / or flow requirements of users, thereby obtaining purified water with corresponding water quality and / or flow.

[0130] Furthermore, the filter element is provided with a first water inlet channel for connecting the first water inlet 423 with the first water inlet 21, a second water inlet channel for connecting the second water inlet 424 with the second water inlet 31, a clean water channel for connecting the clean water port with the clean water outlet 421, and a wastewater channel for connecting the wastewater port with the wastewater outlet 422.

[0131] The following is a description with reference to specific drawings and implementation methods.

[0132] Please refer to Figure 6 and Figure 7 In one embodiment, the shell 4 includes a bottle body 41 and a bottle cap 42, the filter element also includes a central tube 5, a first membrane end cap 6 and a second membrane end cap 7 arranged at both ends of the membrane element, the central tube 5 is located in the water collecting pipe 1, the central tube 5 has a first end close to the first membrane end cap 6 and a second end close to the second membrane end cap 7, the central tube 5 is sealed with the bottle cap 42 near the first end; a first opening 61 connected to the first water inlet 423 is formed on the first membrane end cap 6; the bottle cap 42 and the first membrane end cap 6 cooperate to form the first water inlet channel; the bottle cap 42, the central tube 5 and the second membrane end cap 7 cooperate to form the second water inlet channel; the central tube 5, the water collecting pipe 1 and the bottle cap 42 cooperate to form the clean water channel; the shell 4 and the first membrane end cap 6 cooperate to form the wastewater channel.

[0133] In this embodiment, the filter element further includes a central tube 5, a first membrane end cap 6, a second membrane end cap 7, etc. The central tube 5 is located in the water collecting pipe 1. An annular gap is formed between the outer surface of the central tube 5 and the inner surface of the water collecting pipe 1, and the annular gap is connected to the clean water outlet 421, and is used to guide the clean water generated by the filtration of the first membrane unit 2 and / or the second membrane unit 3 to the clean water outlet 421.

[0134] The filter element also includes a first membrane end cap 6 and a second membrane end cap 7 located at both ends of the membrane element. The first membrane end cap 6 and the second membrane end cap 7 can be used as a skeleton to support the membrane element, and can also be used to cooperate with other components to form a guide channel.

[0135] The central tube 5 is close to the first end of the first membrane end cap 6 ( Figure 7 The upper end of the central tube 5 is sealed with the bottle cap 42. Specifically, the sealing can be provided by providing at least one sealing ring at the periphery of the first end of the central tube 5. The sealing ring is used to seal the position of the central tube 5 near the upper end with the bottle cap 42.

[0136] The first membrane end cover 6 is formed with a first opening 61 connected to the first water inlet 423. Specifically, the first opening 61 can be an opening set in the center of the first membrane end cover 6, and the water collecting pipe 1 is inserted into the first opening 61, and a certain gap is formed between the water collecting pipe 1 and the first opening 61, and the raw water entering from the first water inlet 423 can enter the membrane element through the gap.

[0137] The bottle cap 42 cooperates with the first membrane end cap 6 to form the first water inlet channel. The outer surface of the first membrane end cap 6 at the location where the first opening 61 is provided may be provided with a sealing member that seals with the bottle cap 42. Raw water can enter the bottle cap 42 from the first water inlet 423, and enter the first membrane unit 2 through the matching position of the first membrane end cap 6 and the bottle cap 42 and the first opening 61.

[0138] The bottle cap 42, the central tube 5 and the second membrane end cap 7 cooperate to form the second water inlet channel. The lower end of the central tube 5 can be sealed with the water collecting pipe 1. The lower end of the water collecting pipe 1 can be gapped with the second membrane end cap 7. Raw water can enter the bottle cap 42 from the second water inlet 424, pass through the central tube 5, bypass the gap between the water collecting pipe 1 and the second membrane end cap 7, and enter the second membrane unit 3.

[0139] The central tube 5, the water collecting pipe 1 and the bottle cap 42 cooperate to form the clean water channel. The upper end of the central tube 5 can extend out of the water collecting pipe 1, and the upper end of the central tube 5 is sealed with the bottle cap 42. The clean water flowing out of the annular gap between the water collecting pipe 1 and the central tube 5 can pass through the cooperation position between the central tube 5, the water collecting pipe 1 and the bottle cap 42, and finally flow out through the clean water outlet 421 of the bottle cap 42.

[0140] The housing 4 cooperates with the first membrane end cap 6 to form the wastewater channel. A gap for wastewater flow may be formed between the housing 4 and the first membrane end cap 6, and the gap is also connected to the bottle body 41. Water flowing out of the wastewater outlet can flow out from the wastewater outlet 422 after passing through the wastewater channel.

[0141] Please refer to Figure 8 and Fig. 9 In another embodiment, the housing 4 includes a bottle body 41 and a bottle cap 42, the filter element also includes a central tube 5, a first membrane end cap 6 and a second membrane end cap 7 arranged at both ends of the membrane element, the central tube 5 is located in the water collecting pipe 1, the central tube 5 has a first end close to the bottle cap 42 and a second end away from the bottle cap 42, and the central tube 5 is sealed with the bottle cap 42 near the first end. The first membrane end cap 6 is formed with a first opening 61 connected to the wastewater outlet 422.

[0142] The shell 4 and the first membrane end cover 6 cooperate to form the first water inlet channel; the bottle cap 42, the center tube 5 and the second membrane end cover 7 cooperate to form the second water inlet channel; the center tube 5, the water collecting pipe 1 and the bottle cap 42 cooperate to form the clean water channel; the bottle cap 42 and the first membrane end cover 6 cooperate to form the waste water channel.

[0143] In this embodiment, the main components of the filter element are the same as those in the above embodiment, and the specific description of the above embodiment can be referred to, and the present application will not repeat them here. Since the internal water inlet and outlet positions of the membrane element in this application are different from those in the above embodiment, the specific first water inlet channel, second water inlet channel, clean water channel and waste water channel are slightly different.

[0144] Specifically, the housing 4 cooperates with the first membrane end cap 6 to form the first water inlet channel. A gap for raw water to flow may be formed between the housing 4 and the first membrane end cap 6, and the gap is also connected to the bottle body 41. The raw water flowing in from the first water inlet 423 can enter the first membrane unit 2 through the first water inlet channel.

[0145] The bottle cap 42, the central tube 5 and the second membrane end cap 7 cooperate to form the second water inlet channel. The lower end of the central tube 5 can be sealed with the water collecting pipe 1. The lower end of the water collecting pipe 1 can be gapped with the second membrane end cap 7. Raw water can enter the bottle cap 42 from the second water inlet 424, pass through the central tube 5, bypass the gap between the water collecting pipe 1 and the second membrane end cap 7, and enter the second membrane unit 3.

[0146] The clean water channel is formed by the cooperation of the central tube 5, the water collecting pipe 1 and the bottle cap 42. The upper end of the central tube 5 can extend out of the water collecting pipe 1, and the upper end of the central tube 5 is sealed with the bottle cap 42. The clean water flowing out of the annular gap between the water collecting pipe 1 and the central tube 5 can pass through the cooperation position between the central tube 5, the water collecting pipe 1 and the bottle cap 42, and finally flow out through the clean water outlet 421 of the bottle cap 42.

[0147] The bottle cap 42 cooperates with the first membrane end cap 6 to form the wastewater channel.

[0148] The first membrane end cap 6 may be provided with a seal on its outer surface at the first opening 61 for sealing with the bottle cap 42. Wastewater can flow out from the first opening 61, through the matching position of the first membrane end cap 6 and the bottle cap 42, and through the first water inlet 423 of the bottle cap 42.

[0149] In addition, in some embodiments, the filter element also includes a shell 4 for accommodating the membrane element, and the shell 4 is provided with a clean water outlet 421 connected to the water collecting pipe 1; a wastewater outlet 422 connected to the wastewater outlet; and a water inlet connected to the first water inlet 21 and the second water inlet 31.

[0150] In this embodiment, a clean water outlet 421, a waste water outlet 422 and a water inlet are provided on the shell 4 of the filter element. Since the water inlet is connected to both the first water inlet 21 and the second water inlet 31, it is possible to obtain mixed water filtered by the first membrane unit 2 and the second membrane unit 3 without changing the structure of the filter element shell 4, and output it to the user. Since the water quality of the mixed water is different from the clean water filtered by the existing first membrane unit 2 or the second membrane unit 3 alone, it is equivalent to being able to provide a new clean water quality without changing the external structural parts of the filter element.

[0151] A water purification system is also provided in an embodiment of the present application, and the water purification system mainly includes the above-mentioned filter element. The water purification system can achieve the technical effect achieved by the filter element implementation mode by setting the filter element. For details, please refer to the specific description of the above-mentioned implementation mode, and the present application will not repeat it here.

[0152] like Fig.10As shown, in some embodiments, the water purification system further includes: a control valve disposed upstream of the filter element, wherein the control valve is used to control the connectivity between externally input raw water and the filter element.

[0153] When the control valve connects the first water inlet 423 with the raw water input from the outside, the clean water outlet 421 can output the first clean water; when the control valve connects the second water inlet 424 with the raw water input from the outside, the clean water outlet 421 can output the second clean water; when the control valve connects both the first water inlet 423 and the second water inlet 424 with the raw water input from the outside, the clean water outlet 421 can output the third clean water; the water quality and / or flow rate of the first clean water, the second clean water and the third clean water are different.

[0154] In some embodiments, the control valve is a three-way valve, or the control valve includes a first solenoid valve 81 and a second solenoid valve 82;

[0155] like Fig.10 As shown, the control valve includes a first solenoid valve 81 and a second solenoid valve 82 as an example. The first membrane unit 2 and the second membrane unit 3 are at least capable of outputting membrane units of different water qualities as an example. Among them, the water quality level output by the first membrane unit 2 is higher than that of the second membrane unit 3, and the content of trace elements in the water quality output by the first membrane unit 2 is lower than that of the second membrane unit 3.

[0156] The first solenoid valve 81 is located upstream of the first water inlet 423 , and the second solenoid valve 82 is located upstream of the second water inlet 424 .

[0157] When the user needs to output the first purified water of the first water quality, the first solenoid valve 81 connects the raw water with the first water inlet 423 , and filters the raw water using the first membrane unit 2 , thereby outputting the first purified water of the first water quality at the purified water outlet 421 .

[0158] When the user needs to output the second purified water of the second water quality, the second solenoid valve 82 connects the raw water with the second water inlet 424 , and filters the raw water using the second membrane unit 3 , thereby outputting the second purified water of the second water quality at the purified water outlet 421 .

[0159] When the water quality required by the user is between the above two and the user hopes to increase the water output flow rate, the first solenoid valve 81 can be used to connect the raw water with the first water inlet 423, and the second solenoid valve 82 can be used to connect the raw water with the second water inlet 424. The first membrane unit 2 and the second membrane unit 3 are used to filter the raw water at the same time, and a mixture of the first water quality and the second water quality, i.e., the third clean water, is output at the clean water outlet 421.

[0160] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0161] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0162] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the scope of patent protection of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A membrane element, characterized in that: The membrane element comprises: A water collecting pipe, wherein the pipe wall of the water collecting pipe is provided with an opening; A first membrane unit and a second membrane unit wound around the water collecting pipe; a first water inlet for introducing raw water into the first membrane unit; a second water inlet for introducing raw water into the second membrane unit; the first water inlet and the second water inlet are located at different positions of the membrane unit; a clean water outlet for conducting clean water out of the first membrane unit and the second membrane unit, the clean water outlet being in communication with the opening; A wastewater outlet for discharging wastewater from the first membrane unit and the second membrane unit.

2. The membrane element according to claim 1, characterized in that: When the membrane element is in the unfolded state, it has a first side connected to the opening of the water collecting pipe, the clean water outlet is located on the first side, a second side opposite to the first side, a third side between the first side and the second side, and a fourth side opposite to the third side, and the wastewater outlet, the first water inlet and the second water inlet are respectively located on the second side, the third side and the fourth side.

3. The membrane element according to claim 2, characterized in that: The first membrane unit is provided with a first wastewater outlet for draining wastewater, and the second membrane unit is provided with a second wastewater outlet for draining wastewater, and the first wastewater outlet and the second wastewater outlet are located on the same side of the membrane element to form the wastewater outlet; The first membrane unit is provided with a first water outlet for conducting purified water, and the second membrane unit is provided with a second water outlet for conducting purified water. The first water outlet and the second water outlet are located on the first side to form the purified water outlet.

4. The membrane element according to claim 3, characterized in that: The first water inlet is arranged on the second side, and the wastewater outlet and the second water inlet are arranged either on the third side or the fourth side.

5. The membrane element according to claim 4, characterized in that: The first membrane unit in the unfolded state comprises: a first side connected to the water collecting pipe, a second side opposite to the first side, a third side between the first side and the second side, a fourth side opposite to the third side, the first water inlet is located on the second side, and the first wastewater outlet is located on the third side or the fourth side; The second membrane unit in the unfolded state comprises: a fifth side connected to the water collecting pipe, a sixth side opposite to the fifth side, a seventh side located between the fifth side and the sixth side, an eighth side opposite to the seventh side, and the second water inlet and the second wastewater outlet are located at either the eighth side or the seventh side; The first side edge and the fifth side edge are both located on the first side; the third side edge and the seventh side edge are both located on the third side; and the fourth side edge and the eighth side edge are both located on the fourth side.

6. The membrane element according to claim 5, characterized in that: The second side is an open side, used to form the first water inlet, the third side has an opening reserved near the water collecting pipe side, and the opening is used to form the first wastewater outlet; the fourth side is a blocked side; the sixth side is a blocked side, and the seventh side and the eighth side are open sides, used to form the second water inlet and the second wastewater outlet, respectively.

7. The membrane element according to claim 3, characterized in that: The wastewater inlet is arranged on the second side, and the first water inlet and the second water inlet are arranged alternatively on the third side and the fourth side.

8. The membrane element according to claim 7, characterized in that: The first membrane unit in the unfolded state comprises: a first side connected to the water collecting pipe, a second side opposite to the first side, a third side located between the first side and the second side, a fourth side opposite to the third side, the first wastewater port located at the second side, and the first water inlet located at the third side or the fourth side; The second membrane unit in the unfolded state comprises: a fifth side connected to the water collecting pipe, a sixth side opposite to the fifth side, a seventh side located between the fifth side and the sixth side, an eighth side opposite to the seventh side, the second wastewater outlet is located on the sixth side, and the second water inlet is located on the eighth side or the seventh side; The first side edge and the fifth side edge are both located on the first side; the third side edge and the seventh side edge are both located on the third side; and the fourth side edge and the eighth side edge are both located on the fourth side.

9. The membrane element according to claim 8, characterized in that: The second side is an open side, used to form the first wastewater outlet, and the third side is reserved with an opening near the water collecting pipe, and the opening is used to form the first water inlet; The sixth side is an open side, which is used to form the second wastewater outlet. The eighth side is reserved with an opening near the water collecting pipe, and the opening is used to form the second water inlet.

10. The membrane element according to any one of claims 1 to 9, characterized in that: The second membrane unit and the first membrane unit are integrally stacked up and down and then wound outside the water collecting pipe; or, The first membrane unit includes multiple layers of first membrane pages, and the second membrane unit includes multiple layers of second membrane pages. The multiple layers of the first membrane pages and the multiple layers of the second membrane pages are alternately stacked in a stacking direction and then wound outside the water collecting pipe.

11. The membrane element according to claim 10, characterized in that: The first membrane unit and the second membrane unit are membrane units of the same type; or, the first membrane unit and the second membrane unit are membrane units of different types; The first membrane unit and the second membrane unit respectively include any one of the following: a reverse osmosis membrane unit, a nanofiltration membrane unit, an ultrafiltration membrane unit, and a microfiltration membrane unit.

12. A filter element, characterized in that: The invention comprises the membrane element as claimed in any one of claims 1 to 11.

13. The filter element according to claim 12, characterized in that The filter element also includes a shell for accommodating the membrane element, and the shell is provided with a clean water outlet connected to the water collecting pipe; a wastewater outlet connected to the wastewater outlet; a first water inlet connected to the first water inlet; and a second water inlet connected to the second water inlet.

14. The filter element according to claim 13, characterized in that The first membrane unit is located on a first water flow path between the first water inlet and the purified water outlet; the second membrane unit is located on a second water flow path between the second water inlet and the purified water outlet.

15. The filter element according to claim 14, characterized in that The filter element is provided with a first water inlet channel for connecting the first water inlet with the first water inlet, a second water inlet channel for connecting the second water inlet with the second water inlet, a clean water channel for connecting the clean water port with the clean water outlet, and a wastewater channel for connecting the wastewater port with the wastewater outlet.

16. The filter element according to claim 15, characterized in that The housing includes a bottle body and a bottle cap, and the filter element also includes a central tube, a first membrane end cap and a second membrane end cap disposed at both ends of the membrane element. The central tube is located in the water collecting pipe, and has a first end close to the first membrane end cap and a second end close to the second membrane end cap, and the central tube is sealed with the bottle cap near the first end; The first membrane end cover is formed with a first opening communicating with the first water inlet; The bottle cap cooperates with the first membrane end cap to form the first water inlet channel; The bottle cap, the central tube and the second membrane end cap cooperate to form the second water inlet channel; The central tube, the water collecting tube and the bottle cap cooperate to form the water purification channel; The shell and the first membrane end cover cooperate to form the wastewater channel.

17. The filter element according to claim 15, characterized in that The housing includes a bottle body and a bottle cap, and the filter element also includes a central tube, a first membrane end cap and a second membrane end cap disposed at both ends of the membrane element. The central tube is located in the water collecting pipe, and has a first end close to the bottle cap and a second end away from the bottle cap, and the central tube is sealed with the bottle cap at a position close to the first end; The first membrane end cover is formed with a first opening communicating with the wastewater outlet; The shell and the first membrane end cover cooperate to form the first water inlet channel; The bottle cap, the central tube and the second membrane end cap cooperate to form the second water inlet channel; The central tube, the water collecting tube and the bottle cap cooperate to form the water purification channel; The bottle cap cooperates with the first membrane end cap to form the wastewater channel.

18. The filter element according to claim 12, characterized in that The filter element also includes a shell for accommodating the membrane element, and the shell is provided with a clean water outlet connected to the water collecting pipe; a wastewater outlet connected to the wastewater outlet; and a water inlet connected to the first water inlet and the second water inlet.

19. A water purification system, characterized in that: Comprising the filter element described in any one of claims 13 to 17.

20. The water purification system according to claim 19, characterized in that: The water purification system further comprises: a control valve disposed upstream of the filter element, the control valve being used to control the communication relationship between the raw water input from the outside and the filter element. When the control valve connects the first water inlet with raw water input from the outside, the purified water outlet can output first purified water; When the control valve connects the second water inlet with raw water input from the outside, the purified water outlet can output second purified water; When the control valve connects the first water inlet and the second water inlet to raw water input from the outside, the clean water outlet can output third clean water; the water quality and / or flow rate of the first clean water, the second clean water and the third clean water are different.

21. The water purification system according to claim 20, characterized in that: The control valve is a three-way valve, or the control valve includes a first solenoid valve and a second solenoid valve.

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