Water purification system

Abstract

The utility model discloses a water purification system relates to water treatment field, the water purification system includes: fine filtration unit, fine filtration unit has raw water end, water purification end and waste water end, with waste water end intercommunication's waste water discharge waterway, waste water discharge waterway has waste water ratio function and intercommunication function, one -way water conservancy waterway, one -way water conservancy waterway one end with water purification end intercommunication, one -way water conservancy waterway other end with waste water end intercommunication, one -way water conservancy waterway can by water purification end to waste water end direction one -way conduction. The application can solve the problem that the tail of the filter membrane is prematurely failed when the fine filtration filter core flushes the raw water side of the filter membrane.

Description

Technical Field

[0001] This utility model relates to the field of water treatment, and in particular to a water purification system. Background Technology

[0002] In the operation of a water purification system, the fine filter cartridge, as the core filtration component, directly determines the quality of the purified water through the filtration performance of its internal membrane. As the filtration process continues, various pollutants in the raw water gradually accumulate on the raw water side of the filter membrane. When the amount of pollutants accumulates to a certain level, it significantly increases filtration resistance, reduces filtration efficiency, and even affects the water purification effect. Therefore, it is urgent to flush the filter membrane to restore its filtration performance. In existing technologies, the conventional solution to this problem is as follows: when the amount of pollutants accumulated on the raw water side of the filter membrane in the fine filter cartridge reaches a preset threshold, the wastewater path of the fine filter cartridge is switched to an open state, while the purified water end of the fine filter cartridge stops supplying water. Then, a large amount of raw water is introduced into the fine filter cartridge, utilizing the flushing action of the raw water to remove the pollutants accumulated on the raw water side of the filter membrane. Practice shows that during this flushing process, the greater the flow rate of raw water, the stronger the flushing force on the pollutants accumulated on the raw water side of the filter membrane, the easier it is to flush away the pollutants, and the more ideal the flushing effect.

[0003] To improve rinsing effectiveness, existing technologies typically increase raw water flow by increasing raw water pressure. However, in practical applications, while this method can improve rinsing to some extent, it introduces new problems: as raw water pressure increases, the downstream end of the filter membrane in the fine filter cartridge experiences premature failure. Specifically, this manifests as a rapid decrease in desalination rate in this area, leading to the loss of filtration function at the downstream end of the membrane. This failure further impacts the overall filtration performance of the membrane, significantly shortening its lifespan, increasing operating costs and maintenance frequency, and failing to meet the practical requirements for long-term, stable, and efficient operation of the water purification system.

[0004] Therefore, how to prevent premature failure of the filter membrane at the tail end and extend the service life of the filter membrane while ensuring the rinsing effect of the fine filter cartridge has become a technical problem that urgently needs to be solved in the field of water purification system related technologies. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a water purification system that can solve the problem of premature failure of the tail end of the filter membrane when the fine filter cartridge is rinsed on the raw water side of the filter membrane.

[0006] The specific technical solution of this utility model embodiment is as follows:

[0007] A water purification system, the water purification system comprising:

[0008] A fine filtration unit, wherein the fine filtration unit has a raw water end, a purified water end and a wastewater end;

[0009] A wastewater discharge channel connected to the wastewater end, the wastewater discharge channel having wastewater ratio function and connectivity function;

[0010] A unidirectional water flow path is provided, with one end connected to the clean water end and the other end connected to the wastewater end. The unidirectional water flow path can unidirectionally flow from the clean water end to the wastewater end.

[0011] Preferably, a first one-way valve is provided on the unidirectional water flow path, and the first one-way valve can unidirectionally flow from the clean water end to the wastewater end.

[0012] Preferably, the flow area of ​​the wastewater discharge channel under the connectivity function is greater than the flow area of ​​the wastewater discharge channel under the wastewater ratio function.

[0013] Preferably, the water purification system includes:

[0014] A purified water output path is provided, which is connected to the purified water end, and a control valve capable of switching on and off is provided on the purified water output path;

[0015] A water inlet passage is provided, which is connected to the raw water end, and an inlet valve is provided on the water inlet passage;

[0016] The water purification system has a flushing mode. In the flushing mode, the control valve is in the off state, the wastewater discharge channel is in the connected state, and the inlet valve is in the open state.

[0017] Preferably, one end of the unidirectional water flow path is connected to the purified water output path or to the purified water end.

[0018] Preferably, the wastewater discharge path is provided with a first on / off unit and a wastewater ratio unit connected in parallel.

[0019] Preferably, the other end of the unidirectional water flow path is connected to the wastewater end;

[0020] or,

[0021] The other end of the unidirectional flow channel is connected to the wastewater discharge channel upstream of the parallel wastewater ratio unit and the first on / off unit.

[0022] Preferably, a second on / off unit is provided in the wastewater discharge path. The second on / off unit is connected in series with the wastewater ratio unit, and the second on / off unit and the wastewater ratio unit are then connected in parallel with the first on / off unit.

[0023] Preferably, a second on / off unit is provided in the wastewater discharge waterway, and the wastewater ratio unit and the first on / off unit connected in parallel are then connected in series with the second on / off unit.

[0024] Preferably, the water purification system further includes: a return water path, one end of which is connected to the purified water end, and the other end of which is connected to the inlet water path. The return water path and the fine filtration unit form a circulating water path. A drive pump is provided on the circulating water path, and a receiving unit is provided between the connection point of the other end of the return water path and the inlet water path and the raw water end of the fine filtration unit.

[0025] Preferably, the containing unit includes a pre-filter unit.

[0026] Preferably, the fine filtration unit includes:

[0027] case;

[0028] The filter element is disposed within the housing. The housing has a purified water outlet channel communicating with the purified water side of the filter element, a raw water inlet channel communicating with the raw water side of the filter element, a wastewater outlet channel communicating with the wastewater side of the filter element, and a one-way flow path, wherein the one-way flow path connects the purified water outlet channel and the wastewater outlet channel.

[0029] Preferably, the fine filtration unit includes:

[0030] A central tube, the filter element is sleeved outside the central tube, and the purified water outlet channel is formed inside the central tube; an upper cover is provided at the end of the filter element, and the raw water inlet channel and the unidirectional water flow path are formed inside the upper cover; the wastewater outlet channel is formed between the outer wall of the filter element and the housing.

[0031] Preferably, the fine filtration unit includes at least one of the following: a reverse osmosis membrane filtration unit, a nanofiltration membrane filtration unit, and an ultrafiltration membrane filtration unit.

[0032] The technical solution of this utility model has the following significant beneficial effects:

[0033] The applicant's research revealed that during the rinsing process, accumulated contaminants on the raw water side of the fine filter cartridge create resistance to the rinsing raw water. This results in lower rinsing pressure on the downstream side of the raw water side, meaning less pressure from the raw water on the filter membrane. Simultaneously, during rinsing, the clean water supply to the fine filter cartridge stops. Upstream of the raw water side of the filter membrane, the raw water pressure is high, allowing a small amount of water to permeate to the clean water side, thus increasing the pressure there. Since all locations on the clean water side of the filter membrane are interconnected and there is no significant pressure reduction due to contaminants, the water pressure at different locations on the clean water side is generally similar to the pressure on the upstream clean water side of the raw water side. This can lead to a problem: the water pressure downstream of the raw water side of the filter membrane is lower, while the corresponding water pressure downstream of the raw water side of the filter membrane is higher, sometimes exceeding the water pressure downstream of the raw water side. Once this happens, the purified water on the purified water side will pass through the filter membrane in the opposite direction under pressure, which will damage the filter membrane. This will cause the downstream area of ​​the filter membrane on the raw water side (i.e., the tail section) to fail prematurely, and the desalination rate in this area will drop rapidly, resulting in the loss of the filtration function at the tail section of the filter membrane. Considering the specific reasons mentioned above, in order to solve this problem, the applicant connected the purified water end of the fine filtration unit to the wastewater end of the fine filtration unit through a one-way flow path. This one-way flow path allows for unidirectional flow from the purified water end to the wastewater end. In this way, during rinsing, if the water pressure on the purified water side downstream of the raw water side of the filter membrane is greater than the water pressure downstream of the raw water side, the purified water on the purified water side of the filter membrane can flow into the wastewater discharge path through the one-way flow path. This reduces and alleviates the pressure on the purified water side of the filter membrane, preventing it from exceeding the downstream water pressure on the raw water side. This prevents damage to the downstream area (i.e., the tail end) of the filter membrane on the raw water side, ensuring the service life of the filter membrane, reducing the operating cost and maintenance frequency of the water purification system, and guaranteeing the long-term stable and efficient operation of the water purification system.

[0034] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how 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. Features described and / or shown 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. Attached Figure Description

[0035] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0036] Figure 1 This is a schematic diagram of the water purification system in the first embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the water purification system in the second embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the water purification system in the third embodiment of this utility model;

[0039] Figure 4 This is a schematic diagram of the water purification system in the fourth embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the water purification system in the fifth embodiment of this utility model;

[0041] Figure 6 This is a cross-sectional schematic diagram of the fine filtration unit in one feasible implementation of this utility model.

[0042] The reference numerals in the above figures are as follows:

[0043] 1. Fine filtration unit; 101. Top cover; 102. Filter element; 103. Clean water outlet channel; 104. Raw water inlet channel; 105. Wastewater outlet channel; 106. Central pipe; 2. Wastewater discharge channel; 3. One-way flow channel; 4. First check valve; 5. Clean water output channel; 6. Inlet channel; 7. First on / off unit; 8. Wastewater ratio unit; 9. Second on / off unit; 10. Return channel; 11. Drive pump; 12. Reception unit; 13. Post-filtration unit; 14. First water channel; 15. Inlet valve; 16. Control valve; 17. Second check valve; 18. Third check valve. Detailed Implementation

[0044] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0045] To address the issue of premature membrane failure at the tail end during rinsing of the filter membrane on the raw water side, this application proposes a water purification system. Figure 1 This is a schematic diagram of the water purification system in the first embodiment of the present invention, as shown below. Figure 1 As shown, the water purification system may include: a fine filtration unit 1, which has a raw water end, a purified water end, and a wastewater end; a wastewater discharge channel 2 connected to the wastewater end, which has a wastewater ratio function and a connection function; and a unidirectional flow channel 3, one end of which is connected to the purified water end and the other end of which is connected to the wastewater end, and the unidirectional flow channel 3 can unidirectionally flow from the purified water end to the wastewater end.

[0046] The applicant's research revealed that during the rinsing process, accumulated contaminants on the raw water side of the fine filter cartridge create resistance to the rinsing raw water. This results in lower rinsing pressure on the downstream side of the raw water side, meaning less pressure from the raw water on the filter membrane. Simultaneously, during rinsing, the clean water supply to the fine filter cartridge stops. Upstream of the raw water side of the filter membrane, the raw water pressure is high, allowing a small amount of water to permeate to the clean water side, thus increasing the pressure there. Since all locations on the clean water side of the filter membrane are interconnected and there is no significant pressure reduction due to contaminants, the water pressure at different locations on the clean water side is generally similar to the pressure on the upstream clean water side of the raw water side. This can lead to a problem: the water pressure downstream of the raw water side of the filter membrane is lower, while the corresponding water pressure downstream of the raw water side of the filter membrane is higher, sometimes exceeding the water pressure downstream of the raw water side. Once this happens, the purified water on the purified water side will pass through the filter membrane in the opposite direction under pressure, which will damage the filter membrane. This will cause the downstream area of ​​the filter membrane on the raw water side (i.e., the tail section) to fail prematurely, and the desalination rate in this area will drop rapidly, resulting in the loss of the filtration function at the tail section of the filter membrane. Considering the specific reasons mentioned above, in order to solve this problem, the applicant connects the clean water end of the fine filtration unit 1 to the wastewater end of the fine filtration unit 1 through a one-way flow path 3. The one-way flow path 3 can flow unidirectionally from the clean water end to the wastewater end. In this way, during the rinsing process, if the water pressure on the clean water side downstream of the raw water side of the filter membrane is greater than the water pressure downstream of the raw water side, the clean water on the clean water side of the filter membrane can flow into the wastewater discharge path 2 through the one-way flow path 3. The pressure on the clean water side of the filter membrane can be reduced and alleviated, and there will be no water pressure greater than that downstream of the raw water side. In this way, damage to the downstream area (i.e., the tail) of the filter membrane on the raw water side can be prevented, ensuring the service life of the filter membrane, reducing the operating cost and maintenance frequency of the water purification system, and ensuring the long-term stable and efficient operation of the water purification system.

[0047] like Figure 1As shown, the water purification system may include: a fine filtration unit 1, a wastewater discharge path 2, and a unidirectional flow path 3. The fine filtration unit 1 is a filtration unit capable of filtering water, producing purified water while simultaneously discharging wastewater. Therefore, the fine filtration unit 1 may have a raw water end, a purified water end, and a wastewater end. Raw water can be input from the raw water end of the fine filtration unit 1. After filtration, the purified water is output from the purified water end, while the wastewater generated during the filtration process is discharged from the wastewater end. The fine filtration unit 1 filters the raw water through a filter membrane, which may have opposing raw water and purified water sides. The raw water side may have a raw water flow channel, with its two ends connected to the raw water end and the wastewater end, respectively. The purified water side may have a purified water flow channel, connected to the purified water end. The wastewater discharge path 2 is connected to the wastewater end, and the wastewater discharged from the wastewater end is discharged through the wastewater discharge path 2. The wastewater discharge path 2 has both wastewater ratio and connectivity functions. When wastewater discharge channel 2 is in wastewater ratio function mode, the water purification system can filter and output purified water normally. When wastewater discharge channel 2 is in connectivity function mode, all raw water input to the water purification system will pass through the fine filtration unit 1 and then be discharged from wastewater discharge channel 2. In this case, the connectivity function can be understood as wastewater discharge channel 2 being in a connectivity state with a large flow area, allowing water to pass through wastewater discharge channel 2 at a high flow rate. That is to say, the flow area of ​​wastewater discharge channel 2 in connectivity function mode is greater than the flow area of ​​wastewater discharge channel 2 in wastewater ratio function mode.

[0048] To enable the wastewater discharge path 2 to have both wastewater ratio and connectivity functions, in one feasible embodiment, the wastewater discharge path 2 may be equipped with a first on / off unit 7 and a wastewater ratio unit 8 connected in parallel. When the first on / off unit 7 is in the connected state, the wastewater discharge path 2 is in the connectivity function. When the wastewater ratio unit 8 is activated and the first on / off unit 7 is in the off state, the wastewater discharge path 2 is in the wastewater ratio function.

[0049] The unidirectional water flow path 3 allows the purified water end of the fine filtration unit 1 to be connected to the wastewater end of the fine filtration unit 1. Specifically, the unidirectional water flow path 3 allows for unidirectional flow from the purified water end to the wastewater end.

[0050] To achieve unidirectional flow of the unidirectional water passage 3, in one feasible embodiment, a first one-way valve 4 is provided on the unidirectional water passage 3, which allows unidirectional flow from the clean water end to the wastewater end. Correspondingly, in this embodiment, the other end of the unidirectional water passage 3 can be connected to the wastewater end. Alternatively, the other end of the unidirectional water passage 3 can be connected to the wastewater discharge passage 2 upstream of the parallel wastewater ratio unit 8 and the first on / off unit 7.

[0051] In order to connect the clean water end and the wastewater end through the unidirectional water flow path 3, in other feasible embodiments... Figure 6 This is a cross-sectional schematic diagram of the fine filtration unit in one feasible implementation of this utility model, as shown below. Figure 6 As shown, a one-way flow path 3 can be installed within the fine filtration unit 1. For example, the fine filtration unit 1 may include: a housing; and a filter element 102 installed within the housing. The filter element 102 may be formed of a filter membrane. The housing has a clean water outlet channel 103 communicating with the clean water side of the filter element 102, a raw water inlet channel 104 communicating with the raw water side of the filter element 102, a wastewater outlet channel 105 communicating with the wastewater side of the filter element 102, and the one-way flow path 3, which connects the clean water outlet channel 103 and the wastewater outlet channel 105. Furthermore, the fine filtration unit 1 may include: a central tube 106, the filter element 102 being sleeved outside the central tube 106, and the purified water outlet channel 103 being formed inside the central tube 106; an upper cover 101 disposed at the end of the filter element 102, the upper cover 101 having the raw water inlet channel 104 and the unidirectional flow path 3 formed inside; and the wastewater outlet channel 105 being formed between the outer wall of the filter element 102 and the housing.

[0052] After the raw water enters the housing, it flows from the raw water inlet channel 104 to the raw water side of the filter element 102. The purified water formed after filtration exits the housing through the purified water outlet channel 103 in the central pipe 106. Wastewater formed during the filtration process is discharged from the housing through the wastewater outlet channel 105. During the rinsing process, if the water pressure on the purified water side downstream of the raw water side of the filter membrane is greater than the water pressure downstream of the raw water side, the purified water on the purified water side of the filter membrane can flow through the purified water outlet channel 103 in the central pipe 106 and the unidirectional flow path 3 formed in the upper cover 101 into the wastewater outlet channel 105 formed between the outer wall and the housing, and then enter the wastewater discharge channel 2. In this way, the pressure on the purified water side of the filter membrane can be reduced and alleviated.

[0053] In this application, as feasible, the fine filtration unit 1 may include at least one of the following: reverse osmosis membrane filtration unit, nanofiltration membrane filtration unit, ultrafiltration membrane filtration unit, etc. Of course, in other feasible embodiments, the fine filtration unit 1 may also include other types of filtration units, and this application does not limit them in any way.

[0054] In one feasible implementation, the water purification system may include a purified water output path 5 and an inlet path 6. The purified water output path 5 may be connected to the purified water terminal, and purified water output from the terminal is supplied to the purified water output path 5 for user use. Figure 2This is a schematic diagram of the water purification system in the second embodiment of this utility model, as shown below. Figure 2 As shown, a control valve 16 capable of switching the purified water output path 5 on and off can be installed on the purified water output path 5. When purified water is not output, the purified water output path 5 can be disconnected through the control valve 16. The inlet water path 6 is connected to the raw water source, and the upstream of the inlet water path 6 can be connected to a water source. An inlet valve 15 is installed on the inlet water path 6, which can control whether the water source inputs raw water into the purified water system.

[0055] The water purification system can have a flushing mode. In this flushing mode, the control valve 16 is in the off state, the wastewater discharge channel 2 is in the connected state, and the inlet valve 15 is in the open state. Through the flushing mode, a large flow of raw water input from the inlet channel 6 can flush the raw water side of the filter membrane of the fine filtration unit 1 to remove accumulated contaminants. Since the wastewater discharge channel 2 is in the connected state, a large amount of wastewater generated during flushing can be discharged through the wastewater discharge channel 2. During this period, since the purified water output channel 5 is controlled to be off by the control valve 16, if the pressure on the purified water side of the filter membrane rises, the purified water on the purified water side can flow into the wastewater discharge channel 2 through the one-way flow channel 3, thereby achieving the purpose of lowering the pressure. In this way, the downstream area (i.e., the tail end) of the filter membrane on the raw water side will not be damaged when the fine filtration unit 1 is flushed, ensuring good filtration function at the tail end of the filter membrane.

[0056] To ensure that the wastewater discharge path 2 can be completely disconnected, a second on / off unit 9 can be installed on the wastewater discharge path 2. In one embodiment, Figure 3 This is a schematic diagram of the water purification system in the third embodiment of this utility model, as shown below. Figure 3 As shown, the second on / off unit 9 is connected in series with the wastewater ratio unit 8, and the series-connected second on / off unit 9 and wastewater ratio unit 8 are then connected in parallel with the first on / off unit 7. In another embodiment, Figure 4 This is a schematic diagram of the water purification system in the fourth embodiment of this utility model, as shown below. Figure 4 As shown, the parallel wastewater ratio unit 8 and the first on / off unit 7 are then connected in series with the second on / off unit 9.

[0057] In the above embodiments, further, Figure 5 This is a schematic diagram of the water purification system in the fifth embodiment of this utility model, as shown below. Figure 5As shown, the water purification system may include: a return water path 10, one end of which is connected to the purified water end, and the other end of which is connected to the inlet water path 6. The return water path 10 and the fine filtration unit 1 form a circulating water path. A drive pump 11 is installed on the circulating water path. A receiving unit 12 is installed between the connection point of the other end of the return water path 10 and the inlet water path 6 and the raw water end of the fine filtration unit 1. Furthermore, a second one-way valve 17 may be installed on the return water path 10, which opens from the purified water end to the inlet water path 6.

[0058] The containing unit 12 only needs to be able to store a certain amount of water. As a feasible option, such as... Figure 5 As shown, the receiving unit 12 may include a pre-filter unit, which may be located on the inlet water passage 6. Alternatively, the receiving unit 12 may include a drive pump 11.

[0059] Alternatively, the water purification system may further include a post-filtration unit 13, which may be connected downstream of the purified water end of the fine filtration unit 1. Both the pre-filtration unit and the post-filtration unit 13 may employ corresponding filtration units from the prior art, and no limitations are imposed on them in this application.

[0060] To prevent excessively high TDS in the first cup of water output when the water purification system is not output for an extended period, the drive pump 11 can be activated while the wastewater discharge path 2 is completely disconnected. This allows the water in the circulating water path to pass through the fine filtration unit 1, thus purifying the water in the receiving unit 12. Then, the inlet valve 15 on the inlet water path 6 is opened, and the wastewater discharge path 2 is switched to either a continuous flow or a wastewater ratio function. By controlling the opening time of the inlet valve 15, raw water can enter the receiving unit 12, pushing out the purified water. This purified water can then enter the raw water side of the filter membrane in the fine filtration unit 1, replacing the raw water there. The original raw water can then be discharged through the wastewater discharge path 2. In this way, the entire raw water side of the filter membrane in the fine filtration unit 1 becomes purified water, ensuring that the first cup of water output after an extended period will not have excessively high TDS.

[0061] In the above embodiments, further, such as Figure 5As shown, the water path from the wastewater end of the fine filtration unit 1 to the clean water end of the fine filtration unit 1 and to the receiving unit 12 can be connected through a first water path 14, which can have a throttling structure. For example, the first water path 14 and the wastewater discharge path 2 can share the wastewater ratio unit 8 as a throttling structure for the first water path 14. Furthermore, a third check valve 18 can be installed on the first water path 14, which connects the wastewater end of the fine filtration unit 1 to the water path from the clean water end of the fine filtration unit 1 to the receiving unit 12. When the drive pump 11 is turned on, the wastewater discharge path 2 is completely disconnected, allowing the water in the circulating water path to be filtered by the fine filtration unit 1, thereby turning the water in the receiving unit 12 into clean water. During this process, the wastewater produced by the fine filtration unit 1 can flow back to the upstream of the raw water end of the fine filtration unit 1 through the first water path 14, thus protecting the filter membrane of the fine filtration unit 1.

[0062] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A water purification system, characterized in that, The water purification system includes: A fine filtration unit, wherein the fine filtration unit has a raw water end, a purified water end and a wastewater end; A wastewater discharge channel connected to the wastewater end, the wastewater discharge channel having wastewater ratio function and connectivity function; A unidirectional water flow path is provided, with one end connected to the clean water end and the other end connected to the wastewater end. The unidirectional water flow path can unidirectionally flow from the clean water end to the wastewater end.

2. The water purification system according to claim 1, characterized in that, A first one-way valve is provided on the unidirectional water flow path, which can unidirectionally flow from the clean water end to the wastewater end.

3. The water purification system according to claim 1, characterized in that, The flow area of ​​the wastewater discharge channel under the connectivity function is greater than the flow area of ​​the wastewater discharge channel under the wastewater ratio function.

4. The water purification system according to claim 1, characterized in that, The water purification system includes: A purified water output path is provided, which is connected to the purified water end, and a control valve capable of switching on and off is provided on the purified water output path; A water inlet passage is provided, which is connected to the raw water end, and an inlet valve is provided on the water inlet passage; The water purification system has a flushing mode. In the flushing mode, the control valve is in the off state, the wastewater discharge channel is in the connected state, and the inlet valve is in the open state.

5. The water purification system according to claim 4, characterized in that, One end of the unidirectional water flow path is connected to the purified water output path or to the purified water end.

6. The water purification system according to claim 4, characterized in that, The wastewater discharge waterway is equipped with a first on / off unit and a wastewater ratio unit connected in parallel.

7. The water purification system according to claim 6, characterized in that, The other end of the unidirectional water flow path is connected to the wastewater end; or, The other end of the unidirectional flow channel is connected to the wastewater discharge channel upstream of the parallel wastewater ratio unit and the first on / off unit.

8. The water purification system according to claim 7, characterized in that, A second on / off unit is provided on the wastewater discharge waterway. The second on / off unit is connected in series with the wastewater ratio unit, and the second on / off unit and the wastewater ratio unit are then connected in parallel with the first on / off unit.

9. The water purification system according to claim 7, characterized in that, A second on / off unit is provided on the wastewater discharge waterway, and the wastewater ratio unit and the first on / off unit, which are connected in parallel, are then connected in series with the second on / off unit.

10. The water purification system according to claim 8 or 9, characterized in that, The water purification system further includes: a return water path, one end of which is connected to the purified water end, and the other end of which is connected to the inlet water path. The return water path and the fine filtration unit form a circulating water path. A drive pump is installed on the circulating water path, and a receiving unit is installed between the connection point of the other end of the return water path and the inlet water path and the raw water end of the fine filtration unit.

11. The water purification system according to claim 10, characterized in that, The containing unit includes a pre-filter unit.

12. The water purification system according to claim 1, characterized in that, The fine filtration unit includes: case; The filter element is disposed within the housing. The housing has a purified water outlet channel communicating with the purified water side of the filter element, a raw water inlet channel communicating with the raw water side of the filter element, a wastewater outlet channel communicating with the wastewater side of the filter element, and a one-way flow path, wherein the one-way flow path connects the purified water outlet channel and the wastewater outlet channel.

13. The water purification system according to claim 12, characterized in that, The fine filtration unit includes: A central tube, the filter element is sleeved outside the central tube, and the purified water outlet channel is formed inside the central tube; an upper cover is provided at the end of the filter element, and the raw water inlet channel and the unidirectional water flow path are formed inside the upper cover; the wastewater outlet channel is formed between the outer wall of the filter element and the housing.

14. The water purification system according to claim 1, characterized in that, The fine filtration unit includes at least one of the following: a reverse osmosis membrane filtration unit, a nanofiltration membrane filtration unit, or an ultrafiltration membrane filtration unit.

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