Water purifier

Abstract

The utility model discloses a water purifier which comprises a raw water inlet, a pure water outlet and a wastewater discharge outlet, the filtering unit comprises a shell and a reverse osmosis membrane element arranged in the shell, a raw water port, a pure water port and a wastewater port are formed in the shell, the pure water outlet can be communicated with the pure water port, and the wastewater discharge port can be communicated with the wastewater port; the booster pump is arranged between the raw water inlet and the raw water port, and the water inlet valve is used for controlling the communication relation between the water purifier and external raw water; the water purifier comprises a water supply state capable of outputting pure water outwards, the water supply state comprises a first stage and a second stage, in the first stage, the water inlet valve is in a communicated state, the booster pump is in a working state, and the pure water filtered by the reverse osmosis membrane element flows out of the water purifier from the pure water outlet; meanwhile, no wastewater is discharged from the reverse osmosis membrane element to the water purifier from the wastewater discharge port. According to the water purifier provided by the invention, the actual water efficiency of the water purifier can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a water purifier. Background Art

[0002] For existing water purifiers, especially large-flow tankless water purifiers, the raw water flowing into the raw water inlet is filtered through a reverse osmosis membrane device during use. The filtered pure water flows out of the pure water inlet, and the wastewater is discharged from the wastewater inlet. When the water purifier is not in use, the concentrated wastewater remains on the wastewater side of the reverse osmosis membrane in the reverse osmosis membrane device, which plays a filtering role. After a certain period of time, the salt or other soluble solids in the wastewater will penetrate the reverse osmosis membrane and reach the pure water side of the reverse osmosis membrane. In this way, when the water purifier is put into use again, the total dissolved solids (TDS) of the first cup of filtered water that flows out of the water purifier when it is first used is relatively high, which may cause the quality of the filtered water to be low and not pure enough.

[0003] To address this issue, some water purifiers flush the reverse osmosis membrane with filtered or raw water after water production, thereby reducing the TDS of the outlet water. However, the purifier continues to discharge water during the flushing process, resulting in lower actual water efficiency. Current water purifiers do not include this discharged flushing water in their claimed efficiency calculations, resulting in actual water efficiency values ​​lower than the purifier's claimed efficiency.

[0004] Therefore, it is necessary to propose a water purifier to solve at least one of the above problems. Utility Model Content

[0005] In view of the defects existing in the prior art, the present invention provides a water purifier in an embodiment, which can effectively improve the actual water efficiency of the water purifier.

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

[0007] A water purifier, comprising:

[0008] Raw water inlet, pure water outlet and wastewater discharge outlet;

[0009] A filtration unit comprising a housing and a reverse osmosis membrane element disposed within the housing, wherein the housing has a raw water inlet, a pure water inlet, and a waste water inlet, wherein the pure water outlet is communicable with the pure water inlet, and the waste water outlet is communicable with the waste water inlet;

[0010] a booster pump, the booster pump being disposed between the raw water inlet and the raw water inlet of the housing, the booster pump being used to drive water flowing from the raw water inlet into the filter unit;

[0011] A water inlet valve, which is used to control the communication between the water purifier and external raw water;

[0012] The water purifier includes a water supply state capable of outputting pure water to the outside, and the water supply state includes: a first stage and a second stage. In the first stage, the water inlet valve is in a connected state, the booster pump is in a working state, and the pure water filtered by the reverse osmosis membrane element flows out of the water purifier from the pure water outlet, and at the same time, no waste water is discharged from the reverse osmosis membrane element from the wastewater discharge port; in the second stage, the water inlet valve is in a connected state, the booster pump is in a working state, and the pure water filtered by the reverse osmosis membrane element and the wastewater generated by the reverse osmosis membrane element flow out of the water purifier from the pure water outlet and the wastewater discharge port respectively.

[0013] In a preferred embodiment, the water purifier also includes: a first reflux branch, one end of the first reflux branch is connected to the wastewater outlet of the reverse osmosis membrane element, and the other end is connected upstream of the raw water outlet of the reverse osmosis membrane element; in the first stage, the wastewater flowing out of the wastewater outlet of the reverse osmosis membrane element returns to the upstream of the raw water outlet of the reverse osmosis membrane element through the first reflux branch, and enters the raw water outlet of the reverse osmosis membrane element after mixing with the raw water flowing in through the water inlet valve; or, in the first stage, the raw water flowing in through the water inlet valve enters the reverse osmosis membrane element and only produces pure water, and no wastewater.

[0014] In a preferred embodiment, the first reflux branch is provided with any one of the following or a combination thereof: a reflux hole, a flow regulating valve, and an on-off valve.

[0015] In a preferred embodiment, in the first stage, external raw water can enter the water purifier through the raw water inlet, and only produce pure water after being filtered through the reverse osmosis membrane element under the pressure of the booster pump, without producing wastewater.

[0016] In a preferred embodiment, the water purifier also includes a non-water supply state in which pure water is not output to the outside. In the non-water supply state, replacement water is introduced into the water inlet side of the reverse osmosis membrane element for replacement, so that the water inlet side of the reverse osmosis membrane element is replaced with replacement water, and the TDS value of the replacement water is less than the TDS value of the water inlet side of the reverse osmosis membrane element before replacement.

[0017] In a preferred embodiment, the replacement water includes any one of the following: pure water, raw water, a mixture of pure water and raw water, and a mixture of pure water, raw water, a mixture of pure water and raw water and wastewater.

[0018] In a preferred embodiment, the water purifier also includes: a pure water reflux branch, one end of the pure water reflux branch is connected to the pure water port of the reverse osmosis membrane element, and the other end is connected upstream of the raw water port of the reverse osmosis membrane element; in the non-water supply state, the booster pump is in working state, and the pure water filtered by the reverse osmosis membrane element can enter the water inlet side of the reverse osmosis membrane element through the pure water port, the pure water reflux branch, and the raw water port.

[0019] In a preferred embodiment, the water purifier also includes a drainage pipeline, which is used to connect the wastewater port and the wastewater discharge port. A wastewater valve that controls the on-off of the drainage pipeline is provided on the drainage pipeline. When the wastewater valve is in a connected state, the wastewater port is connected to the wastewater discharge port. In the non-water supply state, the water inlet valve is in a connected state, the wastewater valve is in a connected state, the pure water outlet is in a non-open state, and the booster pump is in a working state. The raw water supplied from the outside enters the water purifier through the raw water inlet, and is mixed with the pure water returned by the pure water reflux branch to form the replacement water, which enters the water inlet side of the reverse osmosis membrane element through the raw water port; and the replacement water can flow through the reverse osmosis membrane element and then be discharged from the wastewater discharge port through the wastewater port and the drainage pipeline.

[0020] In a preferred embodiment, the water purifier is provided with the first reflux branch; in the non-water supply state, the water inlet valve is in the disconnected state, the wastewater valve is in the disconnected state, the pure water outlet is in the non-opened state, and the booster pump is in the working state. After the wastewater flowing out of the wastewater outlet of the reverse osmosis membrane element passes through the first reflux branch, the displacement water can be driven into the reverse osmosis membrane element, so that the water inlet side of the reverse osmosis membrane element is replaced by the displacement water.

[0021] In a preferred embodiment, the water purifier further comprises: a water storage unit connected to the pure water return branch, and the water storage unit can be used to store the replacement water.

[0022] In a preferred embodiment, the water purifier further comprises: a pre-filter element, which is arranged upstream of the reverse osmosis membrane element and is used to filter the raw water entering from the raw water inlet.

[0023] In a preferred embodiment, the pre-filter element and the reverse osmosis membrane element are integrated into the same housing.

[0024] In a preferred embodiment, the filtration unit further includes a water barrier and a water collecting pipe, and the water collecting pipe, the reverse osmosis membrane element, the water barrier and the pre-filter element are arranged in sequence from the inside to the outside along the radial direction, and 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 and the outer annular cavity are connected by a connecting part, and the outer annular cavity is used to form the water storage unit.

[0025] In a preferred embodiment, the water purifier further includes a pre-shell for accommodating the pre-filter element, the pre-filter element is disposed in the pre-shell, and the pre-shell is used to form the water storage unit.

[0026] In a preferred embodiment, the water purifier is provided with the first reflux branch, one end of the first reflux branch is connected to the wastewater outlet of the reverse osmosis membrane element, and the other end is connected upstream of the water storage unit. The water purifier also includes a second reflux branch, one end of the second reflux branch is connected to the wastewater outlet of the reverse osmosis membrane element, and the other end is connected between the booster pump and the pre-filter element.

[0027] In a preferred embodiment, the first return branch and the second return branch share at least a portion of the pipeline.

[0028] In a preferred embodiment, the water purification system further includes a TDS detection module for obtaining the TDS of raw water.

[0029] In a preferred embodiment, the water purifier further includes a first detection module, which is used to obtain parameters that can represent the discharge volume of the displacement water in the non-water supply state, and / or the water purifier stores a preset discharge volume.

[0030] In a preferred embodiment, the parameter capable of representing the amount of water discharged by the replacement water includes any one of the following or a combination thereof: replacement time, replacement flow, and the first detection module includes any one of the following or a combination thereof: a timing module, a flow detection module.

[0031] In a preferred embodiment, the water purifier further includes a second detection module, which is used to obtain parameters that can represent the amount of wastewater not discharged in the first stage, and / or the water purifier stores a preset amount of wastewater not discharged in the first stage.

[0032] In a preferred embodiment, the parameters that can represent the amount of wastewater include any one of the following or a combination thereof: the time when wastewater is not discharged, the flow rate of wastewater return, and the time of wastewater return, and the second detection module includes any one of the following or a combination thereof: a flow detection module and a timing module.

[0033] The technical solution of the utility model has the following significant beneficial effects:

[0034] The water purifier provided in the embodiment of the present application includes a water supply state, and the water supply state includes a first stage and a second stage. In the first stage, pure water filtered by the reverse osmosis membrane element flows out of the water purifier from the pure water outlet, and at the same time, no wastewater is discharged from the wastewater outlet of the reverse osmosis membrane element; the amount of wastewater not discharged from the wastewater outlet by the reverse osmosis membrane element in the first stage is used to compensate for the influence of the water discharged outward from the wastewater outlet in the non-water supply state on the actual water efficiency, so that the actual water efficiency can be flexibly controlled to ensure that the actual water efficiency can reach the declared water efficiency or even exceed the declared water efficiency.

[0035] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating how the principles of the present invention can be employed. 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 variations, modifications, and equivalents. Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Furthermore, the shapes and proportional dimensions of the components in the drawings are for illustrative purposes only and are intended to facilitate understanding of the present invention. They are not intended to limit the shapes and proportional dimensions of the components of the present invention. Those skilled in the art, guided by the present invention, may select various possible shapes and proportional dimensions to implement the present invention, depending on the specific circumstances.

[0037] Figure 1 This is a schematic structural diagram of a water purifier provided in an embodiment of the present application;

[0038] Figure 2 This is a schematic diagram of a water purifier provided in an embodiment of the present application in the first stage of water supply;

[0039] Figure 3 This is a schematic diagram of a water purifier provided in an embodiment of the present application in the second stage of water supply;

[0040] Figure 4 This is a schematic diagram of a water purifier provided in an embodiment of the present application in a first mode in a non-water supply state;

[0041] Figure 5 This is a schematic diagram of a water purifier provided in an embodiment of the present application in a second mode in a non-water supply state;

[0042] Figure 6 This is a schematic diagram of a water purifier provided in an embodiment of the present application in a third mode in which the water purifier is in a non-water supply state;

[0043] Figure 7 This is a structural diagram of another water purifier provided in an embodiment of the present application;

[0044] Figure 8 This is a schematic diagram of another water purifier provided in an embodiment of the present application in the first stage of water supply state;

[0045] Figure 9 This is a schematic diagram of another water purifier provided in an embodiment of the present application in the second stage of the water supply state;

[0046] Figure 10 This is a schematic diagram of another water purifier provided in an embodiment of the present application in a first mode in a non-water supply state;

[0047] Figure 11 This is a schematic diagram of another water purifier provided in an embodiment of the present application in a second mode in a non-water supply state;

[0048] Figure 12 This is a schematic diagram of another water purifier provided in an embodiment of the present application in a third mode in a non-water supply state;

[0049] Figure 13 This is a schematic structural diagram of a filtration unit provided in an embodiment of the present application;

[0050] Figure 14 for Figure 13 AA section view shown.

[0051] Reference numerals of this application:

[0052] 1. Water inlet valve;

[0053] 2. Booster pump;

[0054] 300, filter unit;

[0055] 3. Reverse osmosis membrane element;

[0056] 31. Raw water inlet; 32. Waste water inlet; 33. Pure water inlet;

[0057] 4. Pre-filter;

[0058] 41. Front housing;

[0059] 5. Pure water return branch;

[0060] 6. Drainage pipeline;

[0061] 71. First return branch;

[0062] 72. Second return branch;

[0063] 81. Reflux hole;

[0064] 82. On-off valve;

[0065] 83. Wastewater valve;

[0066] 91. Waterproof parts;

[0067] 92. Water collecting pipe;

[0068] 93, inner ring cavity;

[0069] 94, outer ring cavity;

[0070] 95. Connecting part. DETAILED DESCRIPTION

[0071] 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, modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0072] 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 an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementations.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0074] The utility model provides a water purifier, which can effectively improve the actual water efficiency of the water purifier.

[0075] Please refer to the comprehensive Figure 1 or Figure 7 , a water purifier is provided in the embodiment of the present application specification, which may include: a raw water inlet, a pure water outlet and a wastewater discharge port; a filter unit 300, the filter unit 300 includes a shell and a reverse osmosis membrane element 3 arranged in the shell, the shell has a raw water inlet 31, a pure water inlet 33 and a wastewater inlet 32, the pure water outlet can be connected to the pure water inlet 33, and the wastewater discharge port can be connected to the wastewater inlet 32; a booster pump 2, the booster pump 2 is arranged between the raw water inlet and the raw water inlet 31 of the shell, and the booster pump 2 is used to drive the water flowing in from the raw water inlet into the filter unit 300.

[0076] The water purifier may include a non-water supply state (please refer to Figure 4 、 Figure 5 and Figure 6 , or refer to Figure 10 、 Figure 11 and Figure 12 ) and water supply status (please refer to Figure 2 and Figure 3 , or refer to Figure 8 and Figure 9 ), in the non-water supply state, replacement water is introduced into the water inlet side of the reverse osmosis membrane element 3 for replacement, so that the water inlet side of the reverse osmosis membrane element 3 is replaced by replacement water, and the TDS value of the replacement water is less than the TDS value of the water inlet side of the reverse osmosis membrane element 3 before replacement; the water supply state includes the first stage (such as Figure 2 or Figure 8 As shown) and the second stage (as Figure 3 or Figure 9 ), in the first stage, the pure water filtered by the reverse osmosis membrane element 3 is controlled to flow out of the water purifier from the pure water outlet, and at the same time, the reverse osmosis membrane element 3 is controlled to have no waste water discharged from the wastewater discharge port; in the second stage, the pure water filtered by the reverse osmosis membrane element 3 and the wastewater generated by the reverse osmosis membrane element 3 are controlled to flow out of the water purifier from the pure water outlet and the wastewater discharge port respectively.

[0077] In this embodiment of the present application, the water purifier primarily comprises: a raw water inlet, a pure water outlet, a wastewater outlet, a filtration unit 300, a booster pump 2, and other components. The raw water inlet is used to introduce external raw water, such as tap water, into the water purifier; the pure water outlet is used to output purified water; and the wastewater outlet is used to discharge wastewater generated by the filtration unit 300. The filtration unit 300 may primarily include a reverse osmosis membrane element 3 (RO membrane). Alternatively, the water purifier may also include other filtration units 300, such as a pre-filter 4 or a post-filter.

[0078] In addition to the above-mentioned raw water inlet, pure water outlet and wastewater discharge port, filter unit 300, booster pump 2 and other components, the water purifier can also be provided with an inlet valve 1, which is used to control the connection between the water purifier and external raw water.

[0079] In an embodiment of the present application, the water purifier may include a non-water supply state and a water supply state, wherein the non-water supply state may be a non-water supply state in which pure water is not output to the outside; the water supply state may be a water supply state for outputting pure water to the outside.

[0080] When the water purifier is in the water supply state, the water inlet valve 1 is in the connected state, the booster pump 2 is in the working state, and the water flowing in from the outside can enter the water purifier through the raw water inlet. After the water entering the water purifier flows through the filter unit 300, the pure water formed can flow out of the water purifier through the pure water outlet to be supplied to the user.

[0081] In this embodiment, the water supply state may include a first stage and a second stage, wherein the first stage may be a water-saving water production stage. In this first stage, pure water filtered by the reverse osmosis membrane element 3 flows out of the water purifier from the pure water outlet, and at the same time, no waste water is discharged from the reverse osmosis membrane element 3 from the wastewater outlet.

[0082] Among them, the second stage is the normal water production stage. In the second stage, after the raw water enters the reverse osmosis membrane element 3 for filtration, the pure water produced flows to the pure water outlet through the pure water port 33, and then flows out of the water purifier; the generated wastewater flows to the wastewater discharge port through the wastewater port 32, and then flows out of the water purifier.

[0083] Specifically, controlling the reverse osmosis membrane element 3 so that no wastewater is discharged from the wastewater discharge port may include: controlling the reverse osmosis membrane element 3 not to generate wastewater (i.e., the wastewater port 32 of the filter unit 300 does not discharge wastewater, and only the pure water port 33 outputs pure water to the outside), or controlling the reverse osmosis membrane element 3 to generate wastewater, and returning the wastewater generated by the reverse osmosis membrane element 3 to the raw water port 31 (i.e., the wastewater flows out of the wastewater port 32 of the filter unit 300, and the wastewater flowing out of the wastewater port 32 can return to the raw water port 31 through the corresponding flow channel). At this time, the wastewater generated by the reverse osmosis membrane element 3 is not discharged outward through the wastewater discharge port, but is mixed into the raw water entering from the raw water port 31, and then flows into the reverse osmosis membrane element 3. Of course, in some other scenarios, when the reverse osmosis membrane element 3 generates wastewater, it is not ruled out that the wastewater flowing out of the wastewater port 32 is collected and reused.

[0084] In this embodiment, by setting a first stage in which no wastewater flows out of the wastewater discharge port and a second stage of normal water production under the water supply state, the amount of wastewater not discharged from the wastewater discharge port can be reduced during the process in which the wastewater does not flow out of the wastewater discharge port in the first stage, thereby improving the actual water efficiency of the water purifier.

[0085] The actual water efficiency calculation formula is: clean water volume / (clean water volume + concentrated water volume)×100%

[0086] Among them, the purified water volume is the amount of pure water produced by the pure water outlet of the water purifier in the water supply state, and the concentrated water volume is the amount of water discharged from the wastewater outlet of the water purifier in the non-water supply state and the water supply state.

[0087] By reducing the amount of concentrated water (i.e., wastewater) in the denominator of the above formula in the first stage, the actual water efficiency value can be effectively improved.

[0088] In this embodiment, it is ensured that when the water purifier enters the water supply state and produces water, the first stage that can improve the actual water efficiency can always be executed, thereby reliably ensuring that the actual water efficiency can be improved. After the water purifier enters the water supply state, the first stage is executed before the second stage.

[0089] Specifically, for water production, it is a continuous process. Under this water supply state, the first stage and the second stage are executed continuously and uninterruptedly in sequence, that is, the second stage is executed immediately after the first stage is executed, thereby ensuring that the water purifier (especially for large-flow tankless water purifiers) can continuously output pure water to users.

[0090] It should be noted that controlling the water purifier to execute the first stage and then the second stage in the water supply state can be performed without affecting the water purifier's ability to prevent TDS rise and scale formation. More specifically, before the water purifier enters the second state to produce water, the water purifier itself can be in an optimal operating condition, with the TDS on the water inlet side of the reverse osmosis membrane element 3 within a low value range.

[0091] In the embodiment of the present application, in order not to affect the TDS climbing prevention effect and anti-scaling risk of the water purifier, it is provided with a non-water supply state. In this non-water supply state, replacement water is introduced into the water inlet side of the reverse osmosis membrane element 3 for replacement, so that the water inlet side of the reverse osmosis membrane element 3 is replaced with replacement water, and the TDS value of the replacement water is less than the TDS value of the water inlet side of the reverse osmosis membrane element 3 before replacement, ensuring that the TDS value of the water inlet side of the reverse osmosis membrane element 3 is always in a lower numerical range, thereby not affecting the TDS climbing prevention effect and anti-scaling risk of the water purifier.

[0092] The replacement water may include any one of the following: pure water, raw water, a mixture of pure water and raw water, and a mixture of pure water, raw water, and a mixture of pure water and raw water with wastewater.

[0093] Specifically, the replacement water can be pure water, which can be produced after filtration by the reverse osmosis membrane element 3. Of course, in the embodiments of this application, it is not excluded that the pure water can be provided by other filtration mechanisms with the same or equivalent filtration grade. The replacement water can be raw water, which can be tap water flowing in from the raw water inlet. Alternatively, a pre-filter element 4 is provided upstream of the filtration unit 300, and the raw water can be tap water flowing in from the raw water inlet after preliminary filtration by the pre-filter element 4. The replacement water can be a mixture of the above-mentioned pure water and raw water. Furthermore, the replacement water can be a mixture of any of the above-mentioned replacement water forms and wastewater, i.e., any of the above-mentioned replacement water forms is mixed with a portion of wastewater. The wastewater can be produced during filtration by the reverse osmosis membrane element 3. Of course, the specific form of the replacement water can also be other forms, and is not limited to the above description. Persons skilled in the art may make other modifications based on the technical essence of this 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 by the scope of protection of this application.

[0094] On the whole, the TDS value of the replacement water is less than the TDS of the water inlet side of the reverse osmosis membrane element 3 before replacement. When the non-water supply state is executed, the water inlet side of the reverse osmosis membrane element 3 is replaced with replacement water with a smaller TDS. For the filtration unit 300 provided with the reverse osmosis membrane element 3, for example, the reverse osmosis membrane element 3 can specifically include the form of a reverse osmosis membrane sheet, which can be wound on a water collecting pipe, and a water inlet side can be formed on its periphery, and the water inlet side is connected to the wastewater side in the waterway. Furthermore, the water inlet side and the wastewater side can be located on the same side. When the water inlet side is replaced with replacement water with a smaller TDS, the wastewater side can also be replaced with replacement water with a smaller TDS, so that the water on the wastewater side has less effect on the TDS of the pure water side during the process of not making water or during the shutdown process, thereby ensuring that the TDS of the pure water produced when the water purifier is just started to produce water will not be too high. In addition, when the TDS on both the water inlet side and the wastewater side of the water purifier are low when the water purifier is just started to produce water, it can provide a good working condition for the water purifier to control the reverse osmosis membrane element 3 to have no wastewater discharged from the wastewater discharge port in the first stage when the water purifier is just started to produce water, so as to ensure the reliable operation of the water purifier. In other words, when the TDS on both the water inlet side and the wastewater side of the water purifier are low when the water purifier is just started to produce water, in order to be able to effectively improve the actual water efficiency of the water purifier by adopting the method provided in this application: controlling the reverse osmosis membrane element 3 to have no wastewater discharged from the wastewater discharge port in the first stage without affecting the water purifier's anti-TDS climbing effect and anti-scaling risk.

[0095] In some embodiments, before the water purifier enters the water supply state, the non-water supply state is executed so that the TDS value on the water inlet side of the reverse osmosis membrane element 3 is less than the TDS value on the water inlet side of the reverse osmosis membrane element 3 before the non-water supply state is executed.

[0096] In the non-water supply state, when the wastewater discharge port is connected to the wastewater outlet 32, the displacement water can flow through the reverse osmosis membrane element 3 and then be discharged from the wastewater outlet 32 ​​through the wastewater discharge port. The amount of the displacement water discharged from the wastewater discharge port in the non-water supply state is positively correlated with the amount of wastewater not discharged from the wastewater discharge port in the first stage.

[0097] Among them, the amount of wastewater not discharged from the wastewater discharge port in the first stage specifically refers to the amount of wastewater not generated by the reverse osmosis membrane element 3 during the water production process of filtering raw water to obtain pure water, or the amount of wastewater generated but not discharged through the wastewater discharge port (hereinafter referred to as Q1).

[0098] In the non-water supply state, the amount of displacement water discharged from the wastewater discharge port specifically includes: in the non-water supply state, when the reverse osmosis membrane element 3 is replaced and flushed with displacement water, the amount of water discharged from the wastewater discharge port (hereinafter referred to as Q2).

[0099] In one embodiment, the amount of wastewater not discharged from the wastewater discharge port in the first stage is determined according to the amount of replacement water discharged from the wastewater discharge port in the non-water supply state.

[0100] In this embodiment, the amount of wastewater not discharged from the wastewater outlet in the first stage can be used to compensate for the impact of the amount of displacement water discharged from the wastewater outlet on the actual water efficiency in the non-water supply state. The amount of wastewater is proportional to the amount of displacement water discharged.

[0101] Overall, without considering the influence of other factors, to ensure that the actual water efficiency of the water purifier is equal to the declared water efficiency (the amount of concentrated water only considers the wastewater generated in the water supply state, and does not consider the wastewater generated in the first state), the amount of wastewater not discharged in the first stage is Q1, and the amount of water discharged from the wastewater outlet in the non-water supply state is Q2, with Q1 equal to Q2. Furthermore, to ensure that the actual water efficiency of the water purifier exceeds the declared water efficiency, Q1 is greater than Q2.

[0102] In one embodiment, the water purifier further includes a TDS detection module for obtaining the TDS of raw water. The relationship between the amount of water discharged from the wastewater outlet in the non-water supply state and the amount of wastewater not discharged in the first stage can be adjusted according to the TDS of the raw water detected by the TDS detection module.

[0103] In this embodiment, by combining actual water quality conditions, the relationship between the amount of water discharged from the wastewater discharge port in the non-water supply state and the amount of wastewater not discharged in the first stage can be optimized.

[0104] When the TDS detection module is used to obtain that the current raw water quality is poor, it means that the water purifier's ability to prevent TDS climb and scaling is relatively weak when in normal use. At this time, in order to ensure that the water purifier can work stably and reliably for a long time, the amount of wastewater Q1 not discharged in the first stage can be set to be relatively small, for example, less than the amount of water Q2 discharged from the wastewater outlet in the non-water supply state.

[0105] When the TDS detection module is used to obtain that the current raw water quality is good, it means that when the water purifier is used normally, its ability to prevent TDS rise and scaling is relatively strong. At this time, Q1 can be set relatively large as described above, and Q1 is greater than or equal to Q2.

[0106] The water purifier may further include a first detection module for acquiring a parameter representing a discharge volume of the displacement water and / or the water purifier may store a preset discharge volume of the displacement water.

[0107] In this embodiment, the amount of water discharged from the replacement water can be detected by providing a first detection module, or can be pre-stored in the water purifier.

[0108] Among them, the specific form of the first detection module can be different according to the specific form of the parameter of the water discharge volume of the displacement water. For example, the parameter that can represent the water discharge volume can include any one of the following or a combination thereof: replacement time, replacement flow rate, and accordingly, the first detection module can include any one of the following or a combination thereof: a timing module, a flow detection module. Of course, the first detection module can also be in other forms, for example, it can also be a volume measurement module or a mass measurement module. The specific form of the first detection module is not limited to the above examples, and it only needs to be able to functionally obtain the water discharge volume of the displacement water. In actual use, the water discharge volume of the displacement water can be the sum of the water flowing out of the wastewater outlet in the non-water supply state and the water supply state.

[0109] Of course, the water purifier may also pre-store the discharge volume of the displacement water. The discharge volume of the displacement water may be pre-stored before the water purifier leaves the factory, or may be obtained through self-learning of the machine during use of the water purifier. Specifically, this application does not make the sole limitation on it.

[0110] In another embodiment, the amount of replacement water discharged from the wastewater discharge port in the non-water supply state is determined according to the amount of wastewater not discharged in the first stage.

[0111] In this embodiment, similar to the above embodiment, the amount of wastewater not discharged from the wastewater outlet in the first stage can be used to compensate for the impact of the amount of displacement water discharged from the wastewater outlet on the actual water efficiency in the non-water supply state. The amount of wastewater is proportional to the amount of displacement water discharged.

[0112] The water purifier may further include a second detection module for obtaining a parameter indicating the amount of wastewater not discharged in the first stage and / or the water purifier may store a preset amount of wastewater not discharged in the first stage.

[0113] In this embodiment, the parameter of the amount of wastewater not discharged in the first stage can be detected by setting up a second detection module, or can be pre-stored in the water purifier.

[0114] The specific form of the second detection module can vary depending on the specific form of the parameter representing the displacement water discharge volume. For example, the parameter representing the wastewater volume can include any one or a combination of the following: the time during which wastewater is not discharged, the flow rate of wastewater return, and the time of wastewater return. The second detection module can include any one or a combination of the following: a flow detection module and a timing module. Of course, the second detection module can also take other forms and is not limited to the above examples. It only needs to be functionally capable of obtaining the displacement water discharge volume.

[0115] Of course, the water purifier can also pre-store the amount of wastewater that has not been discharged. The amount of wastewater that has not been discharged can be pre-stored before the water purifier leaves the factory, or it can be obtained through machine self-learning during the use of the water purifier. Specifically, this application does not make the only limitation on it.

[0116] In general, the water purifier provided in the embodiment of the present application has a first stage of water-saving operation and a second stage of normal water production in a non-water supply state of outputting pure water.

[0117] In the second stage, the water inlet valve 1 is in a connected state, the booster pump 2 is in a working state, and the external raw water can enter the water purifier through the raw water inlet. Under the pressurized action of the booster pump 2, the pure water generated after filtration through the reverse osmosis membrane element 3 is supplied to the pure water outlet, and the wastewater generated by the reverse osmosis membrane element 3 is discharged through the wastewater discharge port.

[0118] In the first stage, the water inlet valve 1 is in a connected state, the booster pump 2 is in a working state, and the external raw water can enter the water purifier through the raw water inlet. Under the pressurized action of the booster pump 2, it flows through the reverse osmosis membrane element 3 and is filtered to produce only pure water without producing wastewater.

[0119] Among them, for water purifiers with different water channel structures, the corresponding water channel connectivity relationships in different working states are also different.

[0120] In some embodiments, the water purifier may further include: a first reflux branch 71 , one end of which is connected to the wastewater outlet 32 ​​of the reverse osmosis membrane element 3 , and the other end is connected upstream of the raw water outlet 31 of the reverse osmosis membrane element 3 .

[0121] For the above-mentioned water purifier provided with the first reflux branch 71, when the water purifier is in the first stage, the wastewater flowing out of the wastewater outlet 32 ​​of the reverse osmosis membrane element 3 can be controlled to return to the raw water outlet 31 through the first reflux branch 71. Specifically, the water inlet valve 1 is in a connected state, the booster pump 2 is in a working state, and the wastewater flowing out of the wastewater outlet 32 ​​of the reverse osmosis membrane element 3 returns to the upstream of the raw water outlet 31 of the reverse osmosis membrane element 3 through the first reflux branch 71, and enters the raw water outlet 31 of the reverse osmosis membrane element 3 after mixing with the raw water flowing in through the water inlet valve 1.

[0122] Alternatively, for the water purifier provided with the first reflux branch 71 as mentioned above, a similar setting can be made as for the water purifier not provided with the first reflux branch 71. For example, when the water purifier is in the first stage, the water inlet valve 1 is in a connected state, the booster pump 2 is in a working state, and the raw water flowing in through the water inlet valve 1 enters the reverse osmosis membrane element 3 and only produces pure water, without producing wastewater.

[0123] In order to ensure that the first reflux branch 71 can be adapted to a variety of different working conditions, the first reflux branch 71 is provided with any one of the following or a combination thereof: a reflux hole 81 , a flow regulating valve, and an on-off valve 82 .

[0124] Among them, the reflux hole 81 can be a reduced diameter structure with a certain aperture, which can be in a normally open state. Generally, when there are other flow paths connected in parallel with it in a connected state, most of the water will not flow through the reflux hole 81 due to the relatively large flow resistance at the reflux hole 81.

[0125] The flow regulating valve may be in a form in which the flow can be adjusted. Specifically, the flow regulating valve may be in a form in which the flow can be adjusted steplessly. Alternatively, the flow regulating valve may be in a form in which the flow can be adjusted discontinuously at multiple stages. The specific composition and structure of the flow regulating valve are not specifically limited in this application.

[0126] The on-off valve 82 may be in a form capable of controlling the on-off of the first reflux branch 71. Specifically, the specific composition and structure of the on-off valve 82 are not specifically limited in this application.

[0127] The water purifier will be described below with reference to specific drawings and implementation methods.

[0128] In some embodiments, the water purifier may further include a pure water reflux branch 5, one end of which is connected to the pure water port 33 of the reverse osmosis membrane element 3, and the other end of which is connected upstream of the raw water port 31 of the reverse osmosis membrane element 3. In the non-water supply state, the booster pump 2 is in operation, and pure water filtered by the reverse osmosis membrane element 3 can enter the water inlet side of the reverse osmosis membrane element 3 through the pure water port 33, the pure water reflux branch 5, and the raw water port 31. The water inlet side is the side of the reverse osmosis membrane element 3 provided with the water inlet, which is connected to the raw water port 31 and is used to introduce water to be filtered into the reverse osmosis membrane element 3.

[0129] In this embodiment, the water purifier may include a pure water reflux branch 5, which is used to form a branch between the pure water port 33 of the reverse osmosis membrane element 3 and the raw water port 31 of the reverse osmosis membrane element 3, so that when the water purifier enters a non-water supply state, after starting the booster pump 2, the pure water filtered by the reverse osmosis membrane element 3 can pass through the pure water port 33, the pure water reflux branch 5, and the raw water port 31 into the water inlet side of the reverse osmosis membrane element 3, thereby introducing replacement water into the water inlet side of the reverse osmosis membrane element 3.

[0130] Furthermore, the water purifier may also include a drainage pipe 6, which is used to connect the wastewater outlet 32 ​​and the wastewater discharge outlet. The drainage pipe 6 is provided with a wastewater valve 83 for controlling the on and off of the drainage pipe 6. When the wastewater valve 83 is in a connected state, the wastewater outlet 32 ​​is connected to the wastewater discharge outlet.

[0131] In this embodiment, the water purifier can also be provided with a drainage pipe 6, which is mainly used to connect the wastewater outlet 32 ​​and the wastewater discharge port. A wastewater valve 83 can be provided on the drainage pipe 6. When it is necessary to discharge the wastewater outward through the wastewater discharge port, the wastewater valve 83 can be set to a connected state, and the wastewater flowing out of the wastewater outlet 32 ​​can flow through the drainage pipe 6 and be discharged from the water purifier from the wastewater discharge port. Of course, in some cases, this application does not exclude the provision of a wastewater collection device upstream or downstream of the wastewater discharge port, so as to recycle and utilize the wastewater discharged from the wastewater discharge port.

[0132] In some embodiments, in the non-water supply state, the water inlet valve 1 is in a connected state, the wastewater valve 83 is in a connected state, the pure water outlet is in a non-open state, the booster pump 2 is in a working state, and the raw water supplied from the outside enters the water purifier through the raw water inlet, mixes with the pure water returned by the pure water reflux branch 5 to form the displacement water, and enters the water inlet side of the reverse osmosis membrane element 3 through the raw water port 31; and the displacement water can flow through the reverse osmosis membrane element 3 and then pass through the wastewater port 32 and the drainage pipe 6 and be discharged from the wastewater discharge port.

[0133] For the above-mentioned embodiment of the water purifier provided with a pure water reflux branch 5 and a drainage pipe 6, in a non-water supply state, the water on the water inlet side and the wastewater side of the reverse osmosis membrane element 3 can be replaced and flushed by the replacement water formed by mixing raw water and pure water, so that the water inlet side and the wastewater side of the reverse osmosis membrane element 3 are maintained within a lower TDS range.

[0134] In some embodiments, the water purifier may further include: a water storage unit connected to the pure water return branch 5, and the water storage unit can be used to store the replacement water.

[0135] In this embodiment, the water purifier may also be provided with a water storage unit connected to the pure water return branch 5, and the water storage unit is used to store displacement water. The water storage unit can be connected to the pure water return branch 5, or the water storage unit can be formed by a cavity with a certain volume located upstream of the reverse osmosis membrane element 3 in the water purifier.

[0136] When the reverse osmosis membrane element 3 is producing water, it can store the produced pure water in the water storage unit through the pure water return branch 5. Of course, in the embodiments of the present application, it is not excluded that an external pure water supply mechanism is connected to the water storage unit to directly supply water to the water storage unit. In the embodiments of the present application, the reverse osmosis membrane element 3 is used as an example to illustrate water supply to the water storage unit.

[0137] Among them, the specific form of the water storage unit can be a cavity with a certain volume. Specifically, the shape, structure, etc. of the cavity are not specifically limited in this application. The volume of the cavity can be adaptively matched according to the actual demand for water volume replacement, etc., and this application does not make specific limitations here.

[0138] In a first embodiment, for the water purifier provided with a water storage unit, the non-water supply state may include the following modes executed in sequence: a first mode and a second mode.

[0139] In the first mode, the water inlet valve 1 is in the disconnected state, the waste water valve 83 is in the disconnected state, the pure water outlet is in the non-open state, the booster pump 2 is in the working state, and the pure water flowing out of the pure water outlet 33 of the reverse osmosis membrane element 3 can store replacement water in the water storage unit during the process of passing through the pure water reflux branch 5 and the raw water outlet 31 and returning to the reverse osmosis membrane element 3.

[0140] In the second mode, the water inlet valve 1 is in a connected state, the pure water outlet is in a non-open state, and the raw water flowing into the raw water inlet can drive the replacement water in the water storage unit into the reverse osmosis membrane element 3, so that the water inlet side of the reverse osmosis membrane element 3 is replaced by replacement water.

[0141] In this embodiment, the water purifier may include a first mode and a second mode that are executed sequentially, wherein the first mode is executed before the second mode. It should be noted that the second mode may be executed immediately after the first mode ends. In addition, other modes may be executed between the first and second modes. Specifically, the specific form and content of the other modes may vary depending on the specific composition, connectivity, and implemented functions of the water purifier, and this application does not make any specific limitations here.

[0142] The first mode can utilize the pure water return branch 5 for internal circulation, thereby storing replacement water in the water storage unit. In this first mode, the water inlet valve 1 is disconnected, and the raw water is disconnected from the raw water inlet 31 of the reverse osmosis membrane element 3; the wastewater valve 83 is disconnected, and the wastewater outlet 32 ​​is disconnected from the wastewater discharge port; the pure water outlet is closed, and the water at the pure water inlet 33 returns to the raw water inlet 31 of the reverse osmosis membrane element 3 through the pure water return branch 5. During the process of the pure water inlet 33 returning to the raw water inlet 31 of the reverse osmosis membrane element 3 through the pure water return branch 5, the pure water flowing through the water storage unit can be stored in the water storage unit to form part or all of the replacement water required for use in the second mode.

[0143] In the second mode, the booster pump 2 can be in either an operating or non-operating state. When the booster pump 2 is in the operating state, under the boosting effect of the booster pump 2 and the water pressure of the raw water itself, the raw water can quickly drive the replacement water in the water storage unit into the reverse osmosis membrane element 3, so that the water inlet side of the reverse osmosis membrane element 3 is replaced by the replacement water.

[0144] For the second mode, after the water inlet side of the reverse osmosis membrane element 3 is replaced with replacement water, the subsequent water flow path also includes various situations.

[0145] Case 1: In the second mode, the wastewater valve 83 is in a connected state. After the replacement water flows into the reverse osmosis membrane element 3, the water flowing out of the wastewater port 32 can pass through the drainage pipe 6 and be discharged from the wastewater discharge port.

[0146] In this embodiment, in the second mode, after the replacement water flows through the reverse osmosis membrane element 3, it can be discharged to the outside through the drainage pipe 6 and the wastewater discharge port.

[0147] Case 2: The water purifier is a water purifier provided with a first reflux branch 71, and the water storage unit is arranged upstream of the raw water inlet 31 of the reverse osmosis membrane element 3. One end of the first reflux branch 71 is connected to the wastewater outlet 32 ​​of the reverse osmosis membrane element 3, and the other end is connected upstream of the water storage unit. In the second mode, the wastewater valve 83 is in a disconnected state. After the replacement water flows through the reverse osmosis membrane element 3, the water flowing out of the wastewater outlet 32 ​​can pass through the first reflux branch 71 and flow into the water storage unit.

[0148] In this embodiment, for a water purifier provided with a first reflux branch 71, in the second mode, the displacement water can flow into the water storage unit through the first reflux branch 71 after passing through the reverse osmosis membrane element 3. In this second mode, the water storage unit can realize the function of storing the discharge water of the displacement water formed after the displacement water flows through the reverse osmosis membrane element 3.

[0149] In a second embodiment, the non-water supply state includes the following executed in sequence: a first mode and a second mode. In the first mode, the water inlet valve 1 is in a disconnected state, the wastewater valve 83 is in a disconnected state, the pure water outlet is in a non-open state, and the booster pump 2 is in a working state. The pure water flowing out of the pure water outlet 33 of the reverse osmosis membrane element 3 can store replacement water in the water storage unit in the process of passing through the pure water reflux branch 5 and the raw water outlet 31 and returning to the reverse osmosis membrane element 3; in the second mode, the water inlet valve 1 is in a disconnected state, the pure water outlet is in a non-open state, and the wastewater flowing out of the wastewater outlet 32 ​​of the reverse osmosis membrane element 3 can drive the replacement water in the water storage unit into the reverse osmosis membrane element 3, so that the water inlet side of the reverse osmosis membrane element 3 is replaced by replacement water.

[0150] In this embodiment, similar to the above embodiment, the non-water supply state may include a first mode and a second mode executed sequentially. The first mode is executed before the second mode. It should be noted that the second mode may be executed immediately after the first mode ends. In addition, other modes may be executed between the first mode and the second mode. Specifically, the specific form and content of the other mode may vary depending on the specific composition, connectivity, and implemented functions of the water purifier, and this application does not make any specific restrictions here.

[0151] The first mode can refer to the specific description in the first embodiment above, and this application will not elaborate on it here.

[0152] In this embodiment, the second mode differs from the second mode of the first embodiment primarily in the open / closed state of the water inlet valve 1. In this embodiment, the water inlet valve 1 is in the open state. The booster pump 2 is in operation, utilizing the water flowing out of the wastewater outlet 32 ​​of the reverse osmosis membrane element 3 to provide driving force for the replacement water in the water storage unit, thereby driving the replacement water in the water storage unit into the reverse osmosis membrane element 3. This replaces the water inlet side of the reverse osmosis membrane element 3 with the replacement water, while the water flowing out of the wastewater outlet 32 ​​of the reverse osmosis membrane element 3 remains in the water storage unit.

[0153] Furthermore, for the above-mentioned first embodiment or the above-mentioned second embodiment, the non-water supply state can also include a third mode executed before the first mode. In the third mode, the water inlet valve 1 is in a connected state, the pure water outlet is in a non-open state, and the raw water flowing into the raw water inlet can flow through the reverse osmosis membrane element 3 and then be discharged through the wastewater outlet 32.

[0154] In this embodiment, the third mode differs from the second mode primarily in whether pure water has been prepared in the water storage unit. When the second mode is executed after the first mode, pure water has already been prepared in the water storage unit. During the replacement flushing operation, the replacement water includes the pure water in the water storage unit. However, when the third mode is executed before the first mode, pure water has not yet been stored in the water storage unit. In this case, the water inlet valve 1 can be in a connected state, and raw water can be used to flush the reverse osmosis membrane element 3.

[0155] The execution conditions of the third mode can be activated based on the specific operating conditions of the reverse osmosis membrane element 3, the water production duration, etc. In principle, when the water production time of the reverse osmosis membrane element 3 is long, especially when the water production duration of the first stage is long, the third mode can be executed before the first mode to flush the reverse osmosis membrane element 3 with raw water, thereby cleaning the dirt that may be attached to the surface of the reverse osmosis membrane element 3.

[0156] The water purifier may further include a pre-filter 4 , which is disposed upstream of the reverse osmosis membrane element 3 and is used to filter the raw water entering from the raw water inlet.

[0157] Please refer to Figures 1 to 6 as well as Figure 13 and Figure 14 In one embodiment, the pre-filter element 4 and the reverse osmosis membrane element 3 are integrated into the same housing. When the pre-filter element 4 and the reverse osmosis membrane element 3 are integrated into the same housing, the pre-filter element is integrated into the reverse osmosis filter element. To utilize the integrated filtration unit 300 to store pure water and thus function as a water storage unit, the present application optimizes the internal structure of the filtration unit 300.

[0158] The filtration unit 300 may also include a water barrier 91 and a water collecting pipe 92. The water collecting pipe 92, the reverse osmosis membrane element 3, the water barrier 91 and the pre-filter element 4 are arranged in sequence from the inside to the outside along the radial direction. An inner annular cavity 93 is formed between the inner surface of the water barrier 91 and the reverse osmosis membrane element 3, and an outer annular cavity 94 is formed between the outer surface of the water barrier 91 and the shell. The inner annular cavity 93 and the outer annular cavity 94 are connected to each other through a connecting part 95, and the outer annular cavity 94 is used to form the water storage unit.

[0159] In an embodiment, a water barrier 91 is provided between the reverse osmosis membrane element 3 and the pre-filter element 4, wherein an inner annular cavity 93 is formed between the inner surface of the water barrier 91 and the reverse osmosis membrane element 3, and an outer annular cavity 94 is formed between the outer surface of the water barrier 91 and the housing; the inner annular cavity 93 and the outer annular cavity 94 are connected via a connecting portion 95. The outer annular cavity 94 formed between the water barrier 91 and the housing is used to store pure water. Subsequently, when the second mode is used, the pure water stored in the outer annular cavity 94 can be pushed to the water inlet 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 discharged immediately after shutdown.

[0160] When the filter element is used to filter raw water, the raw water entering the shell from the raw water port 31 passes through the pre-filter element 4 radially from the outside to the inside on the outer surface of the pre-filter element 4, enters the inner annular cavity 93 through the connecting portion 95, 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 port 33 through the water collecting pipe 92, and the filtered waste water flows to the wastewater port 32 at the end of the reverse osmosis membrane element 3.

[0161] Furthermore, for the embodiment in which the pre-filter element 4 and the reverse osmosis membrane element 3 are integrated in the same shell, the shell can be a hollow structure. The shell is provided with a raw water inlet 31, a waste water inlet 32, and a pure water inlet 33. Among them, the raw water inlet 31 is used to connect the raw water supplied from the outside. The waste water inlet 32 ​​is used to output the waste water diverted after filtration. The pure water inlet 33 is used to output the pure water obtained after filtration. In this embodiment, a first sub-outer ring cavity 94 is formed between the shell and the pre-filter element 4, and a second sub-outer ring cavity 94 is formed between the pre-filter element 4 and the water barrier 91. When the filter element is filtering raw water, the raw water entering from the raw water inlet first enters the first sub-outer ring cavity 94, flows through the pre-filter element 4, enters the second sub-outer ring cavity 94, and enters the inner ring cavity 93 through the connecting part 95. The pure water filtered by the reverse osmosis membrane element 3 flows to the pure water port 33 through the water collecting pipe 92, and the waste water filtered by the reverse osmosis membrane element 3 flows to the wastewater port 32.

[0162] In this embodiment, the combination of different modes in the non-water supply state of the water purifier may be different based on the different working durations in the first stage.

[0163] Specifically, when the operating time of the water purifier in the first stage is less than the first preset time, the non-water supply state may include: the first mode and the second mode executed in sequence; when the operating time of the water purifier in the first stage is greater than or equal to the second preset time, the non-water supply state may further include: the third mode. Specifically, when the operating time of the water purifier in the first stage is between the first preset time and the second preset time, the non-water supply state may include: the first mode and the second mode executed alternately, and finally end with the second mode.

[0164] Among them, the second preset time length is greater than the first preset time length. Specifically, the values ​​of the first preset time length and the second preset time length can be different in combination with the current operating conditions of the water purifier, such as the water quality conditions in the area, etc. This application does not make specific limitations here.

[0165] Please refer to Figures 7 to 12 In another embodiment, the water purifier may further include a pre-shell 41 for accommodating the pre-filter element 4, the pre-filter element 4 is arranged in the pre-shell 41, and the pre-shell 41 is used to form the water storage unit.

[0166] The main difference between this embodiment and the above embodiment is the location of the pre-filter element 4. In this embodiment, the pre-filter element 4 is disposed in a separate pre-housing 41 and is located upstream of the reverse osmosis membrane element 3 as a whole.

[0167] In a specific embodiment, the water purifier is a water purifier provided with a first reflux branch 71, one end of the first reflux branch 71 is connected to the wastewater outlet 32 ​​of the reverse osmosis membrane element 3, and the other end is connected to the upstream of the water storage unit. The water purifier also includes a second reflux branch 72, one end of the second reflux branch 72 is connected to the wastewater outlet 32 ​​of the reverse osmosis membrane element 3, and the other end is connected between the booster pump 2 and the pre-filter 4.

[0168] In the first mode, the water inlet valve 1 is in the disconnected state, the waste water valve 83 is in the disconnected state, the pure water outlet is in the non-open state, the booster pump 2 is in the working state, and the pure water flowing out of the pure water outlet 33 of the reverse osmosis membrane element 3 can store replacement water in the front shell 41 during the process of passing through the pure water reflux branch 5 and the raw water outlet 31 and returning to the reverse osmosis membrane element 3.

[0169] The reverse osmosis membrane element 3 does not generate wastewater; or, the reverse osmosis membrane element 3 generates wastewater, and the generated wastewater is mixed with the pure water of the pure water reflux branch 5 through the wastewater port 32 and the first reflux branch 71 and then returns to the raw water port 31; or, the reverse osmosis membrane element 3 generates wastewater, and the generated wastewater is mixed with the pure water of the pure water reflux branch 5 through the wastewater port 32 and the second reflux branch 72 and then returns to the raw water port 31.

[0170] In this embodiment, for a water purifier provided with a first reflux branch 71 and a second reflux branch 72, in the first mode, the reverse osmosis membrane element 3 has a variety of different states. First, the reverse osmosis membrane element 3 may not generate wastewater, or the reverse osmosis membrane element 3 may generate wastewater. In the case where the reverse osmosis membrane element 3 generates wastewater, it may have a variety of different flow paths. For example, the portion of wastewater may return to the raw water inlet 31 through the wastewater outlet 32 ​​and the first reflux branch 71, or the portion of wastewater may return to the raw water inlet 31 through the wastewater outlet 32 ​​and the second reflux branch 72. When the portion of wastewater returns to the raw water inlet 31 through the wastewater outlet 32 ​​and the second reflux branch 72, it is equivalent to not passing through the pre-filter 4. Therefore, compared with the case of returning through the first reflux branch 71, it can be beneficial to extend the service life of the pre-filter 4.

[0171] In order to simplify and optimize the pipeline of the water purifier, the first reflux branch 71 and the second reflux branch 72 share at least part of the pipeline.

[0172] Specifically, the first reflux branch 71 and the second reflux branch 72 share part of the pipeline near the wastewater outlet 32, and the first reflux branch 71 and the second reflux branch 72 have an intersection. The first reflux branch 71 can be provided with an on-off valve 82 or a flow regulating valve downstream of the intersection, and the second reflux branch 72 can be provided with a reflux valve or a flow regulating mechanism downstream of the intersection.

[0173] Among them, when the water purifier is in a non-water supply state, the combination of various modes can refer to the specific description of the above-mentioned embodiment. In principle, the combination principles based on the two are similar, and this application will not elaborate on them here.

[0174] It should be noted that, in the description of this application, the terms "first," "second," etc., are used solely for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, nor should they be understood to indicate or imply relative importance. Furthermore, in the description of this application, unless otherwise specified, "plurality" means two or more.

[0175] The above-mentioned various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0176] The above are only a few embodiments of the present invention. Although the embodiments disclosed in the present invention are as above, the contents are only for the purpose of facilitating the understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art of the present invention may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in the present invention. However, the scope of patent protection of the present invention shall still be based on the scope defined by the appended claims.

Claims

1. A water purifier, characterized in that: The water purifier comprises: Raw water inlet, pure water outlet and wastewater discharge outlet; A filtration unit comprising a housing and a reverse osmosis membrane element disposed within the housing, wherein the housing has a raw water inlet, a pure water inlet, and a waste water inlet, wherein the pure water outlet is communicable with the pure water inlet, and the waste water outlet is communicable with the waste water inlet; a booster pump, the booster pump being disposed between the raw water inlet and the raw water inlet of the housing, the booster pump being used to drive water flowing from the raw water inlet into the filter unit; A water inlet valve, which is used to control the communication between the water purifier and external raw water; a pre-filter element, the pre-filter element being arranged upstream of the reverse osmosis membrane element and being used for filtering the raw water entering from the raw water inlet; a pure water reflux branch, one end of which is connected to the pure water port of the reverse osmosis membrane element, and the other end of which is connected upstream of the pre-filter element; The water purifier includes a water supply state capable of outputting pure water, and the water supply state includes: a first stage and a second stage. In the first stage, the water inlet valve is in a connected state, the booster pump is in a working state, and the pure water filtered by the reverse osmosis membrane element flows out of the water purifier from the pure water outlet, and at the same time, no waste water from the reverse osmosis membrane element is discharged from the wastewater discharge port; in the second stage, the water inlet valve is in a connected state, the booster pump is in a working state, and the pure water filtered by the reverse osmosis membrane element and the wastewater generated by the reverse osmosis membrane element flow out of the water purifier from the pure water outlet and the wastewater discharge port respectively. The water purifier also includes a non-water supply state in which pure water is not output to the outside. In the non-water supply state, replacement water is introduced into the water inlet side of the reverse osmosis membrane element for replacement, so that the water inlet side of the reverse osmosis membrane element is replaced by the replacement water, and the TDS value of the replacement water is less than the TDS value of the water inlet side of the reverse osmosis membrane element before replacement; The water purifier further comprises: a water storage unit connected to the pure water return branch, the water storage unit being capable of storing the replacement water; The water purifier further includes a pre-shell for accommodating the pre-filter element. The pre-filter element is disposed in the pre-shell, and the pre-shell is used to form the water storage unit.

2. The water purifier according to claim 1, characterized in that The water purifier further comprises: a first reflux branch, one end of the first reflux branch being connected to the wastewater outlet of the reverse osmosis membrane element, and the other end being connected upstream of the raw water outlet of the reverse osmosis membrane element; In the first stage, the wastewater flowing out of the wastewater outlet of the reverse osmosis membrane element returns to the upstream of the raw water outlet of the reverse osmosis membrane element through the first reflux branch, mixes with the raw water flowing in through the water inlet valve, and then enters the raw water outlet of the reverse osmosis membrane element; or, In the first stage, the raw water flowing in through the water inlet valve and entering the reverse osmosis membrane element only produces pure water without producing wastewater.

3. The water purifier according to claim 2, characterized in that: The first reflux branch is provided with any one of the following or a combination thereof: a reflux hole, a flow regulating valve, and an on-off valve.

4. The water purifier according to claim 1, characterized in that In the first stage, external raw water can enter the water purifier through the raw water inlet, and only produce pure water after being filtered through the reverse osmosis membrane element under the pressure boosting action of the booster pump, without producing wastewater.

5. The water purifier according to claim 1, wherein: The replacement water includes any one of the following: pure water, raw water, a mixture of pure water and raw water, and a mixture of pure water, raw water, and raw water with wastewater.

6. The water purifier according to claim 1, wherein: The water purifier also includes: In the non-water supply state, the booster pump is in working state, and pure water filtered by the reverse osmosis membrane element can enter the water inlet side of the reverse osmosis membrane element through the pure water port, the pure water reflux branch, and the raw water port.

7. The water purifier according to claim 6, characterized in that The water purifier further includes a drainage pipeline, which is used to connect the wastewater outlet and the wastewater discharge port. A wastewater valve for controlling the on-off of the drainage pipeline is provided on the drainage pipeline. When the wastewater valve is in a connected state, the wastewater outlet is connected to the wastewater discharge port. In the non-water supply state, the water inlet valve is in a connected state, the waste water valve is in a connected state, the pure water outlet is in a non-open state, and the booster pump is in a working state. The raw water supplied from the outside enters the water purifier through the raw water inlet, mixes with the pure water returned from the pure water reflux branch to form the replacement water, and enters the water inlet side of the reverse osmosis membrane element through the raw water inlet; and the replacement water can flow through the reverse osmosis membrane element and then pass through the wastewater outlet and the drainage pipeline to be discharged from the wastewater discharge outlet.

8. The water purifier according to claim 6, characterized in that: The water purifier is provided with a first reflux branch and a drainage pipeline, and the drainage pipeline is provided with a wastewater valve for controlling the on-off of the drainage pipeline; In the non-water supply state, the water inlet valve is in the disconnected state, the waste water valve is in the disconnected state, the pure water outlet is in the non-opened state, and the booster pump is in the working state. The wastewater flowing out of the wastewater outlet of the reverse osmosis membrane element can drive the replacement water into the reverse osmosis membrane element after passing through the first reflux branch, so that the water inlet side of the reverse osmosis membrane element is replaced by the replacement water.

9. The water purifier according to claim 1, wherein: The water purifier is provided with a first reflux branch, one end of the first reflux branch is connected to the wastewater outlet of the reverse osmosis membrane element, and the other end is connected upstream of the water storage unit. The water purifier also includes a second reflux branch, one end of the second reflux branch is connected to the wastewater outlet of the reverse osmosis membrane element, and the other end is connected between the booster pump and the pre-filter element.

10. The water purifier according to claim 9, characterized in that: The first return branch and the second return branch share at least a portion of the pipeline.

11. The water purifier according to claim 1, wherein: The water purifier further includes a TDS detection module for obtaining the TDS of raw water.

12. The water purifier according to claim 1, wherein: The water purifier further includes a first detection module, which is used to obtain a parameter that can represent the discharge water volume of the displacement water in the non-water supply state, and / or the water purifier stores a preset discharge water volume.

13. The water purifier according to claim 12, wherein: The parameter capable of representing the amount of water discharged by the replacement water includes any one of the following or a combination thereof: replacement time, replacement flow rate, and the first detection module includes any one of the following or a combination thereof: a timing module, a flow detection module.

14. The water purifier according to claim 1, wherein: The water purifier further includes a second detection module, which is used to obtain parameters that can represent the amount of wastewater not discharged in the first stage, and / or the water purifier stores a preset amount of wastewater not discharged in the first stage.

15. The water purifier according to claim 14, characterized in that: The parameters that can represent the amount of wastewater include any one of the following or a combination thereof: the time when wastewater is not discharged, the flow rate of wastewater return, and the time of wastewater return. The second detection module includes any one of the following or a combination thereof: a flow detection module and a timing module.

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