Filter element and waterway system

Abstract

The utility model discloses a filter element and a waterway system, and relates to the technical field of water treatment.The filter element comprises a shell, a water collecting pipe arranged in the shell, and a reverse osmosis membrane element, a water separation piece and a front filter element which are sequentially arranged from inside to outside in the radial direction of the water collecting pipe; an inner ring cavity is formed between the inner surface of the water separation piece and the reverse osmosis membrane element, and an outer ring cavity is formed between the outer surface of the water separation piece and the shell; and the inner ring cavity is communicated with the outer ring cavity through a communicating part. According to the filter element, the front filter element and the reverse osmosis membrane element are ingeniously integrated, and meanwhile, the content of TDS and harmful substances in purified water which is just discharged after shutdown can be reduced.

Description

Technical Field

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

[0002] A water purifier is a water treatment device used to purify water. A wound membrane element is one of the commonly used filter elements in a water purifier. The wound membrane element filters the raw water to obtain clean water and the remaining waste water, which are then discharged separately.

[0003] However, when the water purification device is shut down, there is wastewater in the membrane element and the membrane shell. The wastewater will diffuse into the inside of the membrane element during the shutdown process; further, the wastewater diffused into the inside of the membrane element may slowly penetrate into the water purification side of the membrane element, so that when the user takes water from the water purification device again, the TDS and harmful substance content in the water discharged from the water purification device will be high.

[0004] Therefore, it is necessary to propose a filter element and a water system to solve the above problems. Utility Model Content

[0005] In view of the defects existing in the prior art, a filter element is provided in an embodiment of the utility model, which cleverly integrates the pre-filter element and the reverse osmosis membrane element, and can also reduce the TDS and harmful substance content in the clean water just discharged after shutdown.

[0006] The specific technical solution of the implementation mode of the utility model is:

[0007] A filter element, comprising: a shell, a water collecting pipe arranged in the shell, and a reverse osmosis membrane element, a water barrier and a pre-filter element arranged in sequence from the inside to the outside along the radial direction of the water collecting pipe; an inner annular cavity is formed between the inner surface of the water barrier and the reverse osmosis membrane element, and an outer annular cavity is formed between the outer surface of the water barrier and the shell; the inner annular cavity is connected to the outer annular cavity through a connecting part.

[0008] In a preferred embodiment, the water blocking member is in a coiled state, and the water blocking member surrounds the water collecting pipe for at least one circle.

[0009] In a preferred embodiment, a raw water inlet, a waste water outlet, and a pure water outlet are provided on the shell, a first sub-outer ring cavity is formed between the shell and the pre-filter element, and a second sub-outer ring cavity is formed between the pre-filter element and the water barrier. The raw water entering from the raw water inlet first enters the first sub-outer ring cavity, flows through the pre-filter element, enters the second sub-outer ring cavity, and enters the inner ring cavity through the connecting part. The pure water filtered through the reverse osmosis membrane element flows to the pure water outlet through the water collecting pipe, and the waste water filtered through the reverse osmosis membrane element flows to the wastewater outlet.

[0010] In a preferred embodiment, the connecting portion is arranged on a side away from the raw water inlet and / or the waste water outlet.

[0011] In a preferred embodiment, the shell includes: a filter bottle and an end cover, the filter bottle has a bottle body with an open end at one end and a blocked end at the other end, the end cover is arranged at the open end of the filter bottle, and the raw water inlet, the waste water outlet and the pure water outlet are all arranged on the end cover.

[0012] In a preferred embodiment, the connecting portion includes any one of the following or a combination thereof: at least one opening provided on a side of the water blocking member close to the blocking end; an annular notch provided on a side of the water blocking member close to the blocking end.

[0013] In a preferred embodiment, the water barrier has a first side close to the open end and a second side close to the blocked end in the axial direction along the water collecting pipe, the first side is flush with a side of the reverse osmosis membrane element and the pre-filter element close to the open end, and the second side has a predetermined distance to a side of the reverse osmosis membrane element and the pre-filter element close to the blocked end to form the annular gap.

[0014] In a preferred embodiment, the predetermined distance is within 1 / 3 of the axial dimension of the reverse osmosis membrane element or the pre-filter element.

[0015] In a preferred embodiment, the water barrier comprises a water-impermeable film.

[0016] In a preferred embodiment, the reverse osmosis membrane element includes a reverse osmosis membrane sheet, which is wound outside the water collecting pipe; the water barrier is wound outside the reverse osmosis membrane element, and the pre-filter element includes a pre-filter membrane, which is wound outside the water barrier.

[0017] In a preferred embodiment, the shell is provided with a raw water inlet, a wastewater outlet, and a pure water outlet. The raw water entering the shell from the raw water inlet passes through the pre-filter element radially from outside to inside on the outer surface of the pre-filter element, enters the inner annular cavity through the connecting portion, and then enters the reverse osmosis membrane element along the outer peripheral surface of the reverse osmosis membrane element. The pure water filtered by the reverse osmosis membrane element flows to the pure water outlet through the water collecting pipe, and the filtered wastewater flows to the wastewater outlet at the end of the reverse osmosis membrane element.

[0018] In a preferred embodiment, a post-filter element is also provided in the water collecting pipe.

[0019] A water system, the water system comprising any one of the filter elements described above, the water system also comprising: a water pump connected to the filter element, which can pressurize the reverse osmosis membrane element of the filter element after being started; a pure water reflux branch, one end of which is connected to the pure water outlet of the filter element, and the other end is connected to the upstream of the water pump; a drainage pipeline, the drainage pipeline is connected to the wastewater outlet of the filter element, and a wastewater valve is provided on the drainage pipeline.

[0020] In a preferred embodiment, the water system also includes a wastewater return branch, one end of which is connected to the wastewater outlet of the filter element, and the other end is connected to the upstream of the water pump, and a flow control device is provided on the wastewater return branch.

[0021] In a preferred embodiment, the flow control device includes a control valve capable of switching between at least a first flow rate and a second flow rate, and the first flow rate is greater than the second flow rate.

[0022] In a preferred embodiment, the wastewater return branch includes: a first return branch and a second return branch in parallel, and the flow control device includes: a first valve arranged on the first return branch and capable of generating a first flow, and a second valve arranged on the second return branch and capable of generating a second flow, and the first flow is greater than the second flow.

[0023] In a preferred embodiment, the water circuit system also includes a water inlet valve, which is arranged upstream of the water pump, and the water circuit system includes a water production mode and a water storage mode; when the water circuit system is in the water production mode, the water inlet valve is in a connected state, the water pump is in a started state, and water supplied from an external water source enters the filter element through the water inlet valve and the water pump to be filtered to prepare pure water; when the water circuit system is in the water storage mode, the water inlet valve is in a disconnected state, the water pump is in a started state, and the pure water prepared by the filter element is stored in the outer ring cavity through the pure water reflux branch.

[0024] In a preferred embodiment, the water system also includes a flushing mode. When the water system is in the flushing mode, the water inlet valve is in a connected state, the wastewater valve is in a connected state, and water supplied from an external water source enters the filter element through the water inlet valve and the water pump, driving the pure water stored in the outer ring cavity to flow through the inner ring cavity and the reverse osmosis membrane element, and then discharged to the outside through the drainage pipeline.

[0025] In a preferred embodiment, the water circuit system also includes an inlet valve, which is arranged upstream of the water pump, and the water circuit system includes a water production mode and a water storage mode; when the water circuit system is in the water production mode, the inlet valve is in a connected state, the water pump is in a started state, and water supplied from an external water source enters the filter element through the inlet valve and the water pump to be filtered to prepare pure water; at the same time, the wastewater flowing out of the wastewater outlet of the filter element is refluxed at a second flow rate through the wastewater reflux branch, and can be mixed with water supplied from an external water source; when the water circuit system is in the water storage mode, the inlet valve is in a disconnected state, the water pump is in a started state, and the pure water prepared by the filter element is stored in the outer ring cavity through the pure water reflux branch.

[0026] In a preferred embodiment, the water system also includes a flushing mode. When the water system is in the flushing mode, the water inlet valve is in a disconnected state, the water pump is in a started state, and the wastewater flowing out from the wastewater outlet of the filter element is refluxed through the wastewater reflux branch at a first flow rate, enters the outer ring cavity through the water pump, and drives the pure water stored in the outer ring cavity to flow through the inner ring cavity and the reverse osmosis membrane element; or, the water inlet valve is in a connected state, and the wastewater valve is in a connected state, and water supplied from an external water source enters the filter element through the water inlet valve and the water pump, driving the pure water stored in the outer ring cavity to flow through the inner ring cavity and the reverse osmosis membrane element, and then discharged to the outside through the drainage pipeline.

[0027] The technical solution of the utility model has the following significant beneficial effects:

[0028] In the embodiment of the present application, a water barrier is arranged between the reverse osmosis membrane element and the pre-filter element, wherein an inner ring cavity is formed between the inner surface of the water barrier and the reverse osmosis membrane element, and an outer ring cavity is formed between the outer surface of the water barrier and the shell; the inner ring cavity and the outer ring cavity are connected through a connecting portion. The outer ring cavity formed between the water barrier and the shell is used to store pure water. When flushing is performed later, the pure water stored in the outer ring cavity can be pushed to the clean water side of the reverse osmosis membrane element to flush the reverse osmosis membrane element, thereby effectively reducing the TDS and harmful substance content in the clean water just discharged after shutdown.

[0029] 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

[0030] 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.

[0031] Figure 1 This is a schematic diagram of the structure of a filter element provided in an embodiment of the present application;

[0032] Figure 2 for Figure 1 Cross-sectional view of the middle filter element AA;

[0033] Figure 3 This is a schematic diagram of an expanded filter element provided in an embodiment of the present application;

[0034] Figure 4 A schematic diagram of a water system provided in an embodiment of the present application Figure 1 ;

[0035] Figure 5 A schematic diagram of a water system provided in an embodiment of the present application Figure 2 ;

[0036] Figure 6 A schematic diagram of a water system provided in an embodiment of the present application Figure 3 .

[0037] Reference numerals of the present application: 10, housing;

[0038] 11. Raw water import;

[0039] 12. Wastewater outlet;

[0040] 13. Pure water outlet;

[0041] 14. Filter bottle;

[0042] 15. End cap;

[0043] 2. Water collecting pipe;

[0044] 3. Reverse osmosis membrane element; 30. Reverse osmosis membrane;

[0045] 31. Inner cloth guide;

[0046] 32. Grid;

[0047] 4. Waterproof parts;

[0048] 40. Connecting part;

[0049] 5. Pre-filter element; 50. Pre-filter membrane;

[0050] 51. External guide cloth;

[0051] 61, inner ring cavity;

[0052] 62. Outer ring cavity;

[0053] 621, first sub-outer ring cavity; 622, second sub-outer ring cavity; 7, post-filter element; 81, water pump;

[0054] 210, pure water return branch; 220, drainage pipeline;

[0055] 230. Wastewater return branch;

[0056] 231, first return branch;

[0057] 232, the second return branch;

[0058] 82. Wastewater valve;

[0059] 83. Control valve;

[0060] 84. First valve;

[0061] 85. Second valve;

[0062] 86. Water inlet valve. DETAILED DESCRIPTION

[0063] 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.

[0064] 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.

[0065] 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.

[0066] Some solutions have been proposed in the prior art to solve the problem of high TDS of the first water used after shutdown. For example, one of the technical solutions adopted in the prior art is that the pre-filter and the reverse osmosis filter are two independent filter elements, the pre-filter is used to store pure water, and the pure water stored in the pre-filter is then used to flush the reverse osmosis filter.

[0067] At present, water purifiers tend to be miniaturized. In order to meet the needs of miniaturized design, one way is to integrate filter elements with multiple functions. For example, the pre-filter element and the reverse osmosis filter element can be integrated. When the pre-filter element and the reverse osmosis filter element are integrated, the pre-filter element and the reverse osmosis filter element are set in the same housing, and there is no independent cavity for storing pure water. Therefore, how to use the integrated filter element to store pure water for flushing the reverse osmosis filter element is an urgent problem to be solved.

[0068] The utility model provides a filter element, which cleverly integrates a pre-filter element and a reverse osmosis membrane element, constructs a cavity for storing pure water inside the filter element, and can also reduce the TDS and harmful substance content in the clean water just discharged after shutdown.

[0069] Please refer to Figure 1 to Figure 2 In the embodiment of the present application specification, a filter element is provided, which may include: a shell 10, a water collecting pipe 2 arranged in the shell 10, and a reverse osmosis membrane element 3, a water barrier 4 and a pre-filter element 5 arranged in sequence from the inside to the outside along the radial direction of the water collecting pipe 2; an inner annular cavity 61 is formed between the inner surface of the water barrier 4 and the reverse osmosis membrane element 3, and an outer annular cavity 62 is formed between the outer surface of the water barrier 4 and the shell 10; the inner annular cavity 61 and the outer annular cavity 62 are connected to each other through a connecting portion 40.

[0070] In the embodiment of the present application, a water barrier 4 is provided between the reverse osmosis membrane element 3 and the pre-filter element 5, wherein an inner ring cavity 61 is formed between the inner surface of the water barrier 4 and the reverse osmosis membrane element 3, and an outer ring cavity 62 is formed between the outer surface of the water barrier 4 and the shell 10; the inner ring cavity 61 and the outer ring cavity 62 are connected through a connecting portion 40. The outer ring cavity 62 formed between the water barrier 4 and the shell 10 is used to store pure water. When flushing is performed later, the pure water stored in the outer ring cavity 62 can be pushed to the clean water side of the reverse osmosis membrane element 3 to flush the reverse osmosis membrane element 3, thereby effectively reducing the TDS and harmful substance content in the clean water just discharged after shutdown.

[0071] The present application will be described in detail below with reference to specific drawings and implementation methods.

[0072] In the implementation manner of the present application, the filter element mainly includes: a shell 10, a water collecting pipe 2, a reverse osmosis membrane element 3, a water barrier 4 and a pre-filter element 5.

[0073] The housing 10 may be a hollow structure. The housing 10 is provided with a raw water inlet 11, a waste water outlet 12, and a pure water outlet 13. The raw water inlet 11 is used to connect the raw water supplied from the outside. The waste water outlet 12 is used to output the waste water diverted after filtration. The pure water outlet 13 is used to output the pure water obtained after filtration.

[0074] In this embodiment, a first sub-outer ring cavity 621 is formed between the shell 10 and the pre-filter element 5, and a second sub-outer ring cavity 622 is formed between the pre-filter element 5 and the water barrier 4. When the filter element is filtering raw water, the raw water entering from the raw water inlet 11 first enters the first sub-outer ring cavity 621, flows through the pre-filter element 5, enters the second sub-outer ring cavity 622, and enters the inner ring cavity 61 through the connecting portion 40. The pure water filtered by the reverse osmosis membrane element 3 flows to the pure water outlet 13 through the water collecting pipe 2, and the waste water filtered by the reverse osmosis membrane element 3 flows to the waste water outlet 12.

[0075] Specifically, the housing 10 may include: a filter bottle 14 and an end cap 15. The filter bottle 14 has a bottle body with an open end at one end and a blocked end at the other end, and the end cap 15 is arranged at the open end of the filter bottle 14. Specifically, the end cap 15 can be connected to the bottle body in a detachable manner. The raw water inlet 11, the waste water outlet 12 and the pure water outlet 13 can all be arranged on the end cap 15.

[0076] In this embodiment, the water collecting pipe 2 may be a hollow tube structure. An opening connected to the reverse osmosis membrane element 3 is provided on the water collecting pipe 2, and pure water filtered by the reverse osmosis membrane element 3 may enter the water collecting pipe 2 through the opening. One end of the water collecting pipe 2 may be an open end, and the open end is used to communicate with the pure water outlet 13 on the housing 10, so that the pure water filtered by the filter element can be guided to the pure water outlet 13 through the open end.

[0077] In addition, a post-filter element 7 may be provided in the water collecting pipe 2, so as to further improve the integration of the filter element and reduce the volume of the water purifier. Specifically, the post-filter element 7 may be in the form of a post-carbon rod. Of course, the specific form of the post-filter element 7 is not limited to the above examples. Technicians in the relevant field may make other changes under the inspiration of the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0078] See also Figure 3 , the reverse osmosis membrane element 3 may include a reverse osmosis membrane sheet 30, and the reverse osmosis membrane sheet 30 is wound outside the water collecting pipe 2. The number of the reverse osmosis membrane sheet 30 may be at least one, and when the reverse osmosis membrane sheet 30 is multiple, two adjacent reverse osmosis membrane sheets 30 may be spaced apart by a grid 32. The reverse osmosis membrane sheet 30 may also include an inner guide cloth 31 for guiding flow, and in the unfolded state, the inner guide cloth 31 may be located at the bottom layer of the reverse osmosis membrane sheet 30, and in the wound state, the inner guide cloth 31 may be located at the outermost layer of the reverse osmosis membrane sheet 30. The inner guide cloth 31 may be used to separate the spacer from the reverse osmosis membrane element 3 to prevent the two from being completely attached. The length of the inner guide cloth 31 along the axis perpendicular to the water collecting pipe 2, that is, the length of the long side, may be greater than the length of the reverse osmosis membrane sheet 30, so that the inner guide cloth 31 can completely cover the reverse osmosis membrane sheet 30 at least in the circumferential direction.

[0079] In the unfolded state, the reverse osmosis membrane 30 has a first side connected to the water collecting pipe 2, a second side opposite to the first side, a third side connecting the first side and the second side, and a fourth side opposite to the third side, the second side is provided with a water inlet, the first side is provided with a pure water inlet, and the third side is provided with a waste water inlet. That is, the reverse osmosis membrane 30 has water inlet from the peripheral side and water outlet from the end.

[0080] The water barrier 4 is wound outside the reverse osmosis membrane element 3. The water barrier 4 is water-impermeable and can separate the water phases on both sides of the water barrier 4. Specifically, the water barrier 4 may include a water-impermeable film. Of course, the specific form of the water barrier 4 is not limited to the above examples. Technicians in the relevant field may make other changes inspired by the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0081] The water barrier 4 is in a wound state, and the water barrier 4 at least surrounds the water collecting pipe 2 once, thereby ensuring the sealing in the circumferential direction. When the water barrier 4 is arranged between the reverse osmosis membrane element 3 and the pre-filter element 5, the reverse osmosis membrane element 3 and the pre-filter element 5 can be separated into two cavities, namely the inner annular cavity 61 and the outer annular cavity 62.

[0082] The pre-filter element 5 may include a pre-filter membrane 50, and the pre-filter membrane 50 is wound outside the water barrier 4. The pre-filter element 5 may also be provided with an outer guide cloth 51 for diversion. In the unfolded state, the outer guide cloth 51 is located at the bottom of the pre-filter membrane 50. In the wound state, the outer guide cloth 51 may be located at the periphery of the pre-filter element 5. Among them, the outer guide cloth 51 may specifically be PP cotton, which can be used to intercept particulate impurities. The pre-filter membrane 50 may specifically be a carbon fiber membrane. Of course, the specific forms of the outer guide cloth 51 and the pre-filter membrane 50 are not limited to the above examples. The technical personnel in the relevant field may make other changes under the inspiration of the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0083] When the filter element is used to filter raw water, the raw water entering the housing 10 from the raw water inlet 11 passes through the pre-filter element 5 radially from the outside to the inside on the outer surface of the pre-filter element 5, enters the inner annular cavity 61 through the connecting portion 40, and then enters the reverse osmosis membrane element 3 along the outer peripheral surface of the reverse osmosis membrane element 3. The pure water filtered by the reverse osmosis membrane element 3 flows to the pure water outlet 13 through the water collecting pipe 2, and the filtered waste water flows to the wastewater outlet 12 at the end of the reverse osmosis membrane element 3.

[0084] In some embodiments, the connecting portion 40 is disposed on a side away from the raw water inlet 11 and / or the waste water outlet 12. During flushing, in order to push as much pure water stored in the outer ring cavity 62 as possible into the reverse osmosis membrane element 3 and to efficiently flush the pure water side of the reverse osmosis membrane element 3, the connecting portion 40 can be disposed on a side away from the flushing driving water. For example, when the water that drives the pure water to flow is raw water, that is, when the raw water is used to drive the pure water stored in the outer ring cavity 62 to flow into the reverse osmosis membrane element 3, the connecting portion 40 can be disposed away from the raw water inlet 11; when the driving water that drives the pure water to flow is waste water, that is, when the waste water is used to drive the pure water stored in the outer ring cavity 62 to flow into the reverse osmosis membrane element 3, the connecting portion 40 can be disposed away from the waste water outlet 12. In a specific embodiment, when the raw water inlet 11 and the waste water outlet 12 are both disposed on the end cover 15, the connecting portion 40 is disposed on a side away from the end cover 15 (that is, Figure 2 The filter bottle 14 is located near the bottom of the filter bottle 14).

[0085] Specifically, the connecting portion 40 may include any one of the following or a combination thereof: at least one opening provided on the side of the water barrier 4 close to the blocking end; an annular notch provided on the side of the water barrier 4 close to the blocking end. Of course, the specific method of forming the connecting portion 40 may also be other methods, not limited to the above description. The technicians in the relevant field may make other changes under the inspiration of the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be included in the protection scope of this application.

[0086] For example, when the connecting portion 40 is in the form of an annular notch, the water barrier 4 has a first side close to the opening end and a second side close to the blocking end in the axial direction along the water collecting pipe 2, the first side is flush with the side of the reverse osmosis membrane element 3 and the pre-filter element 5 close to the opening end, and the second side has a predetermined distance to the side of the reverse osmosis membrane element 3 and the pre-filter element 5 close to the blocking end to form the annular notch.

[0087] Furthermore, the predetermined spacing is within 1 / 3 of the axial dimension of the reverse osmosis membrane element 3 or the pre-filter element 5, thereby ensuring that the water barrier 4 can effectively guide the pure water in the outer annular cavity 62 so that as much water as possible can be introduced into the reverse osmosis membrane element 3.

[0088] Please refer to Figure 4 , Figure 5 and Figure 6In an embodiment of the present application, a water system is also provided, and the water system mainly includes the above-mentioned filter element. The water 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.

[0089] In addition, the water system may also include: a water pump 81 connected to the filter element, and after the water pump 81 is started, it can pressurize the reverse osmosis membrane element 3 of the filter element; a pure water reflux branch 210, one end of which is connected to the pure water outlet 13 of the filter element, and the other end is connected to the upstream of the water pump 81; a drainage pipeline 220, which is connected to the waste water outlet 12 of the filter element, and a waste water valve 82 is arranged on the drainage pipeline 220.

[0090] The water system may further include a water inlet valve 86 , which is disposed upstream of the water pump 81 . The water system includes a water production mode and a water storage mode.

[0091] When the water system is in the water production mode, the water inlet valve 86 is in a connected state, the water pump 81 is in a started state, and the water supplied from the external water source enters the filter element through the water inlet valve 86 and the water pump 81 to be filtered and prepare pure water. At this time, the wastewater valve 82 set on the drainage pipeline 220 can be in a connected state, and the wastewater generated in the process of preparing pure water by the filter element can be discharged to the outside through the drainage pipeline 220. Of course, in some cases, it is also possible that the filter element does not discharge wastewater when producing water, and at this time, the wastewater valve 82 can also be in a disconnected state.

[0092] When the water system is in the water storage mode, the water inlet valve 86 is in the disconnected state, the water pump 81 is in the started state, and the pure water prepared by the filter element is stored in the outer ring cavity 62 through the pure water return branch 210. At this time, a circulating water circuit is formed between the pure water outlet 13 of the filter element, the pure water branch, the water pump 81, and the raw water inlet 11 of the filter element.

[0093] like Figure 4 As shown, the water system also includes a flushing mode. When the water system is in the flushing mode, the water inlet valve 86 is in a connected state, the waste water valve 82 is in a connected state, and the water supplied from the external water source enters the filter element through the water inlet valve 86 and the water pump 81, driving the pure water stored in the outer ring cavity 62 to flow through the inner ring cavity 61 and the reverse osmosis membrane element 3, and then discharged to the outside through the drainage pipeline 220. In this embodiment, the raw water supplied from the outside is used to drive the pure water in the outer ring cavity 62 to flow to the reverse osmosis element, and the clean water side of the reverse osmosis membrane element 3 is flushed, thereby effectively reducing the TDS and harmful substance content in the clean water just discharged after shutdown.

[0094] Among them, in this flushing mode, the water pump 81 can be in a closed state, and the pressurized raw water supplied from an external water source is used to provide driving force for the pure water in the outer ring cavity 62; of course, the water pump 81 can also be in a started state, and the water pump 81 in the started state is used to pressurize the incoming raw water to improve the driving efficiency.

[0095] like Figure 5 or Figure 6 As shown, in some embodiments, the water system may further include a wastewater return branch 230, one end of which is connected to the wastewater outlet 12 of the filter element, and the other end is connected to the upstream of the water pump 81, and a flow control device is provided on the wastewater return branch 230. By providing the wastewater return branch 230, wastewater can be recycled, thereby improving the water efficiency of the whole machine and saving water resources.

[0096] The wastewater return branch 230 and the flow control device can be arranged in a variety of different forms. The wastewater return branch 230 can be one or multiple branches connected in parallel, and the flow control device can be an integrated valve or multiple independently arranged valves.

[0097] like Figure 6 As shown, in one embodiment, the wastewater return branch 230 may include: a first return branch 231 and a second return branch 232 in parallel, and the flow control device includes: a first valve 84 arranged on the first return branch 231 and capable of generating a first flow, and a second valve 85 arranged on the second return branch 232 and capable of generating a second flow, and the first flow is greater than the second flow.

[0098] In this embodiment, the wastewater return branch 230 may include a first return branch 231 and a second return branch 232 connected in parallel. A first valve 84 is provided on the first return branch 231, and a second valve 85 may be provided on the second return branch 232. The first valve 84 may be a flushing valve, and the second valve 85 may be a return valve. The flow cross section of the first valve 84 is larger than the flow cross section of the second valve 85. The first flow rate that the first valve 84 can generate on the first return branch 231 is larger than the second flow rate that the second valve 85 can generate on the second return branch 232.

[0099] like Figure 5 As shown, in another embodiment, the flow control device includes a control valve 83 capable of switching between at least a first flow rate and a second flow rate, and the first flow rate is greater than the second flow rate.

[0100] In this embodiment, the control valve 83 may include an integrated valve with two openings and a switching function, so as to at least realize the switching between the first flow rate and the second flow rate; in addition, the control valve 83 may also be a valve capable of steplessly adjusting the opening, for example, the control valve 83 includes a valve body with an opening and a valve core capable of changing the size of the valve body opening, and when the relative position of the valve core and the opening is changed, the flow rate of the control valve 83 can be adjusted. In addition, the specific setting method of the control valve 83 may also be other methods, not limited to the above description, and the technicians in the relevant field may make other changes under the inspiration of the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be included in the protection scope of this application.

[0101] In this embodiment, the water system further includes a water inlet valve 86 , which is disposed upstream of the water pump 81 . The water system includes a water production mode and a water storage mode.

[0102] When the water system is in the water production mode, the water inlet valve 86 is in a connected state, the water pump 81 is in a started state, and the water supplied from the external water source enters the filter element through the water inlet valve 86 and the water pump 81 to be filtered to prepare pure water; at the same time, the wastewater flowing out of the wastewater outlet 12 of the filter element is refluxed through the wastewater return branch 230 at a second flow rate, and can be mixed with the water supplied from the external water source, and the mixed water then flows into the filter element for filtration.

[0103] Among them, when the water system is in the water production mode, when the wastewater is refluxed by using the wastewater reflux branch 230, compared with the dead-end filtration that does not discharge the wastewater, the pressure in the filter element can be released through the wastewater reflux branch 230, which is beneficial to extend the service life of the filter element; in addition, by refluxing the wastewater, it is also beneficial to improve the water efficiency of the whole machine and achieve the effect of saving water resources.

[0104] When the water system is in the water storage mode, the water inlet valve 86 is in the disconnected state, the water pump 81 is in the started state, and the pure water prepared by the filter element is stored in the outer ring cavity 62 through the pure water return branch 210 .

[0105] In the above-mentioned embodiments in which the wastewater return branch 230 is provided, the water system may also include a flushing mode.

[0106] Similar to the above-mentioned implementation method in which the wastewater return branch 230 is not set, when the water system is in the flushing mode, the raw water can be used as the driving power source to push the pure water in the outer ring cavity 62 to the clean water side of the reverse osmosis membrane element 3 to flush the reverse osmosis membrane element 3, thereby effectively reducing the TDS and harmful substance content in the clean water just discharged after shutdown.

[0107] Specifically, the water inlet valve 86 is in a connected state, the wastewater valve 82 is in a connected state, and the water supplied from the external water source enters the filter element through the water inlet valve 86 and the water pump 81, driving the pure water stored in the outer ring cavity 62 to flow through the inner ring cavity 61 and the reverse osmosis membrane element 3, and then discharged to the outside through the drainage pipe 220.

[0108] Alternatively, when the flushing mode is started, the wastewater refluxed to the front of the pump through the above-mentioned reflux branch can be used to drive the pure water in the outer ring cavity 62 to flow to the clean water side of the reverse osmosis membrane element 3 to flush the reverse osmosis membrane element 3, thereby effectively reducing the TDS and harmful substance content in the clean water just discharged after shutdown.

[0109] Specifically, when the water system is in the flushing mode, the water inlet valve 86 is in the disconnected state, the water pump 81 is in the started state, and the wastewater flowing out from the wastewater outlet 12 of the filter element is refluxed at a first flow rate through the wastewater reflux branch 230, and enters the outer ring cavity 62 through the water pump 81 to drive the pure water stored in the outer ring cavity 62 to flow through the inner ring cavity 61 and the reverse osmosis membrane element 3, thereby flushing the reverse osmosis membrane element 3, thereby effectively reducing the TDS and harmful substance content in the clean water just discharged after shutdown.

[0110] 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.

[0111] 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.

[0112] 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 filter element, characterized in that: The filter element comprises: a housing, a water collecting pipe arranged in the housing, and a reverse osmosis membrane element, a water blocking member and a pre-filter element arranged in sequence from the inside to the outside along the radial direction of the water collecting pipe; An inner annular cavity is formed between the inner surface of the water barrier and the reverse osmosis membrane element, and an outer annular cavity is formed between the outer surface of the water barrier and the shell; The inner annular cavity is connected with the outer annular cavity through a connecting portion.

2. The filter element according to claim 1, characterized in that: The water blocking member is in a coiled state, and the water blocking member surrounds the water collecting pipe for at least one cycle.

3. The filter element according to claim 1, characterized in that: The shell is provided with a raw water inlet, a waste water outlet, and a pure water outlet. A first sub-outer ring cavity is formed between the shell and the pre-filter element, and a second sub-outer ring cavity is formed between the pre-filter element and the water barrier. The raw water entering from the raw water inlet first enters the first sub-outer ring cavity, flows through the pre-filter element, enters the second sub-outer ring cavity, and enters the inner ring cavity through the connecting part. The pure water filtered by the reverse osmosis membrane element flows to the pure water outlet through the water collecting pipe, and the waste water filtered by the reverse osmosis membrane element flows to the wastewater outlet.

4. The filter element according to claim 3, characterized in that: The connecting portion is arranged at a side away from the raw water inlet and / or the waste water outlet.

5. The filter element according to claim 4, characterized in that: The shell includes: a filter bottle and an end cover, the filter bottle has a bottle body with an open end at one end and a blocked end at the other end, the end cover is arranged at the open end of the filter bottle, and the raw water inlet, the waste water outlet and the pure water outlet are all arranged on the end cover.

6. The filter element according to claim 5, characterized in that The connecting portion includes any one or a combination of the following: The water blocking member has at least one opening disposed on a side close to the blocking end; The water blocking member has an annular notch disposed on one side close to the blocking end.

7. The filter element according to claim 6, characterized in that The water barrier has a first side close to the open end and a second side close to the blocked end in the axial direction along the water collecting pipe, the first side is flush with the side of the reverse osmosis membrane element and the pre-filter element close to the open end, and the second side has a predetermined distance to the side of the reverse osmosis membrane element and the pre-filter element close to the blocked end to form the annular gap.

8. The filter element according to claim 7, characterized in that The predetermined distance is within 1 / 3 of the axial dimension of the reverse osmosis membrane element or the pre-filter element.

9. The filter element according to claim 2, characterized in that: The water barrier comprises a water-impermeable film.

10. The filter element according to claim 1, characterized in that: The reverse osmosis membrane element comprises a reverse osmosis membrane sheet, which is wound outside the water collecting pipe; the water barrier is wound outside the reverse osmosis membrane element, and the pre-filter element comprises a pre-filter membrane, which is wound outside the water barrier.

11. The filter element according to claim 10, characterized in that The shell is provided with a raw water inlet, a waste water outlet and a pure water outlet. The raw water entering the shell from the raw water inlet passes through the pre-filter element from outside to inside along the radial direction on the outer surface of the pre-filter element, enters the inner annular cavity through the connecting portion, and then enters the reverse osmosis membrane element along the outer peripheral surface of the reverse osmosis membrane element. The pure water filtered by the reverse osmosis membrane element flows to the pure water outlet through the water collecting pipe, and the filtered waste water flows to the waste water outlet at the end of the reverse osmosis membrane element.

12. The filter element according to claim 1, characterized in that A post-filter element is also arranged in the water collecting pipe.

13. A waterway system, characterized in that: The waterway system comprises a filter element as claimed in any one of claims 1 to 12, and the waterway system further comprises: A water pump connected to the filter element, which can pressurize the reverse osmosis membrane element of the filter element after being started; A pure water return branch, one end of which is connected to the pure water outlet of the filter element, and the other end of which is connected to the upstream of the water pump; A drainage pipeline is connected to the wastewater outlet of the filter element, and a wastewater valve is arranged on the drainage pipeline.

14. The waterway system according to claim 13, characterized in that: The water system also includes a wastewater return branch, one end of which is connected to the wastewater outlet of the filter element, and the other end is connected to the upstream of the water pump. A flow control device is provided on the wastewater return branch.

15. The waterway system according to claim 14, characterized in that: The flow control device includes a control valve capable of switching between at least a first flow rate and a second flow rate, wherein the first flow rate is greater than the second flow rate.

16. The waterway system according to claim 14, characterized in that: The wastewater return branch includes: a first return branch and a second return branch in parallel, and the flow control device includes: a first valve arranged on the first return branch and capable of generating a first flow, and a second valve arranged on the second return branch and capable of generating a second flow, wherein the first flow is greater than the second flow.

17. The waterway system according to claim 13, characterized in that: The water system further comprises a water inlet valve, which is arranged upstream of the water pump. The water system comprises a water production mode and a water storage mode. When the water system is in the water production mode, the water inlet valve is in a connected state, the water pump is in a started state, and the water supplied from the external water source enters the filter element through the water inlet valve and the water pump to be filtered to prepare pure water; When the water system is in the water storage mode, the water inlet valve is in the disconnected state, the water pump is in the started state, and the pure water prepared by the filter element is stored in the outer ring cavity through the pure water reflux branch.

18. The waterway system according to claim 17, characterized in that: The water system also includes a flushing mode. When the water system is in the flushing mode, the water inlet valve is in a connected state, the wastewater valve is in a connected state, and water supplied from an external water source enters the filter element through the water inlet valve and the water pump, driving the pure water stored in the outer ring cavity to flow through the inner ring cavity and the reverse osmosis membrane element, and then discharged to the outside through the drainage pipeline.

19. The waterway system according to claim 15 or 16, characterized in that: The water system further comprises a water inlet valve, which is arranged upstream of the water pump. The water system comprises a water production mode and a water storage mode. When the water system is in the water production mode, the water inlet valve is in a connected state, the water pump is in a started state, and the water supplied from the external water source enters the filter element through the water inlet valve and the water pump to be filtered to prepare pure water; at the same time, the wastewater flowing out of the wastewater outlet of the filter element is refluxed through the wastewater reflux branch at a second flow rate, and can be mixed with the water supplied from the external water source; When the water system is in the water storage mode, the water inlet valve is in the disconnected state, the water pump is in the started state, and the pure water prepared by the filter element is stored in the outer ring cavity through the pure water reflux branch.

20. The waterway system according to claim 19, characterized in that: The water system also includes a flushing mode. When the water system is in the flushing mode, The water inlet valve is in the disconnected state, the water pump is in the started state, the wastewater flowing out of the wastewater outlet of the filter element is refluxed at a first flow rate through the wastewater reflux branch, and enters the outer ring cavity through the water pump to drive the pure water stored in the outer ring cavity to flow through the inner ring cavity and the reverse osmosis membrane element; or, The water inlet valve is in a connected state, the wastewater valve is in a connected state, and water supplied from an external water source enters the filter element through the water inlet valve and the water pump, driving the pure water stored in the outer ring cavity to flow through the inner ring cavity and the reverse osmosis membrane element, and then discharged to the outside through the drainage pipeline.

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