CN217103316U

CN217103316U - Water purification system and water purifier

Info

Publication number: CN217103316U
Application number: CN202220915016.5U
Authority: CN
Inventors: 任富佳; 胡进华; 陈天; 张富元; 涂小斌; 戚晶云; 郁明跃
Original assignee: Hangzhou Robam Appliances Co Ltd
Current assignee: Hangzhou Robam Appliances Co Ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-08-02
Anticipated expiration: 2032-04-15

Abstract

The utility model belongs to the technical field of water purification equipment, and discloses a water purification system and a water purifier, wherein the water purification system comprises a backflow component and a concentrated water discharge component, the backflow component comprises a second pipeline and a second switch valve, two ends of the second pipeline are respectively communicated with the first pipeline, one end of the second pipeline is positioned at the upstream of a pump, the other end of the second pipeline is positioned between the pump and a water outlet structure, and the second switch valve is arranged on the second pipeline; the concentrated water discharging assembly comprises a third pipeline, a flow regulating valve and a third switch valve, the third pipeline is communicated with the first filter element, and the flow regulating valve and the third switch valve are arranged on the third pipeline. The utility model discloses a water purification system can reduce the washing water consumption, avoids former aquatic pollutant to attach the collection on the filter core surface, and can flow drinkable pure water fast after not using for a long time, avoids wasting water resource and increasing user latency. The purifier includes above-mentioned water purification system, and the cleaning procedure water consumption is little, and the soaking pure water after not using for a long time is more clean, and the user uses and experiences the sense better.

Description

Water purification system and water purifier

Technical Field

The utility model relates to a water purification unit technical field especially relates to a water purification system and purifier.

Background

With the attention and pursuit of people to healthy life, the water purifier becomes a widely used household and commercial water treatment device. The water purifier can effectively filter out impurities such as rust, bacteria and heavy metals in water and adsorb chemical agents such as residual chlorine, odor, heterochrosis and pesticides in water. For the water purifier adopting filter elements such as a reverse osmosis membrane, a nanofiltration membrane or an ultrafiltration membrane, raw water needs to enter the filter elements through pressurization of a booster pump, a concentrated water side and a pure water side are arranged in the filter elements, the pure water on the pure water side flows out from a faucet after the raw water is filtered by the filter elements, and the concentrated water containing harmful substances is left on the concentrated water side and is discharged through a concentrated water valve.

In order to be stored for a long time, the novel filter element is added with organic protective agents such as glycerin and surfactants, residual amine and other organic matters exist in a membrane of the filter element, and the content of the organic matters is high, so that adverse effects on human health are generated. Therefore, a large amount of tap water is needed to be used for cleaning the new filter element before the filter element is used for the first time, so that a large amount of waste of water resources is caused, and when the filter element is cleaned by the tap water, pollutants (such as heavy metals such as lead, arsenic and the like) in the tap water are attached to the surface of a filter membrane of the filter element, so that new pollution risks are brought to the filter element.

In addition, when the purifier does not use for a long time, if do not use for more than 24 hours, the organic matter on filter core surface and the tap water pollutant that attaches the collection can permeate to the pure water one side of filter core, lead to pure water one side heavy metal to exceed standard, need carry out the emission of a large amount of pure water when the purifier does not use for the first time after for a long time, just can discharge the pure water that permeates there is the heavy metal, not only water waste resource but also increased user's latency, the use is felt relatively poor.

Therefore, it is desirable to design a new water purification system and a new water purifier to improve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a water purification system not only can reduce the washing water consumption, prevents that the pollutant that causes from attaching the collection on the filter core surface in the running water cleaning process, and can flow out the pure water fast after not using for a long time, avoids wasting water resources and increasing user's latency.

To achieve the purpose, the utility model adopts the following technical proposal:

a water purification system comprises a water purification assembly, wherein the water purification assembly comprises a first pipeline, and a first switch valve, a pump, a first filter element and a water outlet structure are sequentially arranged on the first pipeline along the flow direction of a fluid; the water purification system still includes:

the backflow assembly comprises a second pipeline and a second switch valve, two ends of the second pipeline are respectively communicated with the first pipeline, one end of the second pipeline is positioned at the upstream of the pump, the other end of the second pipeline is positioned between the pump and the water outlet structure, and the second switch valve is arranged on the second pipeline; and

the concentrated water discharging assembly comprises a third pipeline, a flow regulating valve and a third switch valve, the third pipeline is communicated with the first filter element, and the flow regulating valve and the third switch valve are arranged on the third pipeline.

As a preferred structure of the present invention, the second switch valve includes a check valve and a first solenoid valve, and both the check valve and the first solenoid valve are disposed on the second pipeline; or

The second switch valve is a high opening pressure one-way valve.

As an optimized structure of the utility model, the water purification component further comprises:

a second filter element connected to the first pipe and disposed upstream of the first switching valve.

As an optimized structure of the utility model, the second filter element is a PP folding filter element or an active carbon filter element.

a third filter element connected to the first conduit and located between the water outlet structure and the first filter element.

As a preferred structure of the utility model, the third filter core is carbon-point filter core or carbon fiber filter core.

As an optimal structure of the utility model, the first filter element is an RO reverse osmosis membrane or a nanofiltration membrane.

As a preferred structure of the present invention, the water outlet structure includes a one-way high-pressure switch and a mechanical faucet arranged along the flow direction, the one-way high-pressure switch is configured to close the first on-off valve when the pressure of the fluid in the first pipe exceeds a set value.

As a preferred structure of the present invention, the water outlet structure includes a second solenoid valve and an induction faucet arranged along the flow direction of the fluid, the second solenoid valve is configured to control the first pipe to be turned on or locked when the induction faucet is opened or closed.

Another object of the present invention is to provide a water purifier, which has a small water consumption in the cleaning process, and avoids the accumulation of pollutants caused by tap water on the surface of the filter element; and can flow out the pure water fast after not using for a long time, avoid increasing user's latency, the user uses to experience and feels better.

the water purifying machine comprises a shell and is characterized by further comprising the water purifying system, and part of the water purifying system is contained in the shell.

The utility model has the advantages that:

the utility model provides a water purification system, the pure water after first filter core filters has two circulation routes, and the pure water can supply the user to use through the outflow of water structure, also can realize the pure water backward flow through the upper reaches of second ooff valve backward flow to pump. Before the water purification system is used for the first time, the returned pure water is used for cleaning the first filter element, so that a large amount of cleaning tap water is reduced, the dissolving capacity and the cleaning capacity of the pure water are stronger, the cleaning effect is improved, and the pollutant in the tap water is reduced on the surface of the first filter element due to the reduction of the water amount of the cleaning tap water, so that the new pollution risk to the first filter element is avoided; in addition, the user is in daily use, when water purification system does not use for a long time, can make water purification system carry out and soak the procedure, under the condition that does not supply the running water and do not flow out dense water, the pure water through the second pipeline backward flow can be with the organic matter that has, pollutants such as heavy metal flow back to first filter core upper reaches simultaneously, reduce the pollutant concentration of pure water side soaking water by a wide margin, also can flow drinkable pure water fast after not using for a long time, avoid increasing user's latency, user experience is better. In addition, new tap water is not needed to be introduced in the soaking process, and water is saved.

The water purifier provided by the utility model comprises the water purifying system, the water consumption of the cleaning procedure is small, the cleaning effect on the first filter element is good, and the pollutant in the tap water for cleaning is reduced to be attached to the surface of the filter element; when the water purifier is not used for a long time, a soaking program can be executed so as to enable pollutants such as organic matters and heavy metals in the pure water to flow back to the first filter element and then be filtered again, the concentration of the pollutants in the soaking water on the pure water side is greatly reduced, drinkable pure water can be guaranteed to flow out quickly after the water purifier is not used for a long time, the waiting time of a user is prevented from being increased, and the use experience of the user is better; in addition, new tap water is not required to be introduced in the soaking process, so that water is saved.

Drawings

Fig. 1 is a schematic diagram i of a water purification system provided by a first embodiment of the present invention;

fig. 2 is a schematic diagram of a water purification system provided in the first embodiment of the present invention;

fig. 3 is a schematic diagram of a water purification system provided by the first embodiment of the present invention.

In the figure:

10. a water purification component; 11. a first conduit; 12. a first on-off valve; 13. a pump; 14. a first filter element; 15. a water outlet structure; 151. a one-way high-voltage switch; 152. a mechanical faucet; 153. a second solenoid valve; 154. an induction faucet; 16. a second filter element; 17. a third filter element;

20. a reflow assembly; 21. a second conduit; 22. a second on-off valve; 221. a one-way valve; 222. a first solenoid valve;

30. a concentrated water discharge assembly; 31. a third pipeline; 32. a flow regulating valve; 33. and a third on-off valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

As shown in fig. 1 and 2, an embodiment of the present invention provides a water purification system, which includes a water purification assembly 10, wherein the water purification assembly 10 includes a first pipeline 11, a first switch valve 12, a pump 13, a first filter element 14 and a water outlet structure 15, and the first switch valve 12, the pump 13, the first filter element 14 and the water outlet structure 15 are sequentially arranged on the first pipeline 11 along a flow direction of a fluid. The first switch valve 12 is used for controlling whether raw water enters the first pipeline 11, the pump 13 is used for pressurizing the raw water in the first pipeline 11, so that the raw water sequentially passes through the first switch valve 12, the pump 13 and the first filter element 14 to form pure water, and the pure water is switched on and off by controlling the water outlet structure 15.

The water purification system of the embodiment of the utility model also comprises a concentrated water discharging assembly 30, the concentrated water discharging assembly 30 comprises a third pipeline 31 and a flow regulating valve 32, the third pipeline 31 is communicated with the first filter element 14, the flow regulating valve 32 is arranged on the third pipeline 31, the flow regulating valve 32 adopts an electromagnetic valve, and the flow regulating valve 32 can be switched between a large-flow working position and a small-flow working position; when the flow regulating valve 32 is in the low-flow working position, the concentrated water filtered by the first filter element 14 flows out through the third pipeline 31; when the flow control valve 32 is at the high flow rate working position, the first filter element 14 does not work, and all raw water in the first filter element 14 can flow out through the third pipeline 31.

Preferably, the first filter element 14 is an RO reverse osmosis membrane or a nanofiltration membrane. RO reverse osmosis membrane or receive the filter membrane and all be the pressurization filtration mode, realize economic effectual pollutant separation to the raw water. The running pressure and the filtration precision of the RO reverse osmosis membrane and the nanofiltration membrane are different, and the RO reverse osmosis membrane and the nanofiltration membrane can be selected according to the use requirements of users.

Since the first filter element 14 is added with organic protective agents such as glycerin and surfactants before leaving the factory so as to be capable of being stored for a long time, and these organic matters can have adverse effects on human health, when the water purification system is used for the first time, a large amount of tap water is needed to be used for cleaning, which causes a large amount of waste of water resources, and when the filter element is cleaned by tap water, pollutants (such as heavy metals such as lead and arsenic) in the tap water are attached to the surface of the filter membrane of the filter element, which brings new pollution risk to the filter element. In order to solve the above problem, as shown in fig. 1, the water purification system further includes a backflow assembly 20, the backflow assembly 20 includes a second pipe 21 and a second switch valve 22, two ends of the second pipe 21 are respectively communicated with the first pipe 11, one end of the second pipe 21 is located upstream of the pump 13, and the other end of the second pipe 21 is located between the pump 13 and the water outlet structure 15; a second on-off valve 22 is arranged on the second conduit 21 for controlling the on-off of the second conduit 21, pure water downstream of the first filter cartridge 14 being able to enter upstream of the first filter cartridge 14 in the second conduit 21 via the second on-off valve 22. Before a user uses the water purification system for the first time, the water purification system executes a cleaning program, at the moment, the water purification system closes the water outlet structure 15, the flow regulating valve 32 is in a small-flow working position, the first switch valve 12, the pump 13 and the second switch valve 22 are controlled to be opened, raw water enters the first filter element 14 through the first pipeline 11, filtered pure water flows back to the upstream of the pump 13 through the second pipeline 21 to be mixed with the raw water and then enters the first filter element 14, and the pure water is not directly discharged through the first pipeline 11; thus, a large amount of raw water for washing can be saved, the dissolving power and the cleaning power of the pure water are stronger, the cleaning effect of the first filter element 14 can be improved, and the pollutants in the raw water for washing can be prevented from being attached to the surface of the filter element.

Preferably, the second switching valve 22 may include a check valve 221 and a first solenoid valve 222, and as shown in fig. 1, the check valve 221 and the first solenoid valve 222 are both disposed on the second pipe 21: the first electromagnetic valve 222 controls the second pipeline 21 to be switched on or switched off, the check valve 221 is used for controlling the flow direction of the liquid in the second pipeline 21, pure water can pass through the check valve 221, and raw water at the upstream of the pump 13 cannot pass through the check valve 221, so that the first filter element 14 cannot normally filter and purify the raw water. In addition, as shown in fig. 2, the second switching valve 22 may also be a high cracking pressure check valve: the opening pressure p0 of the high opening pressure check valve is determined by the back pressure p1 (including the pressure loss of the water outlet structure 15 and the first pipeline 11) at the downstream of the first filter element 14 and the self-suction pressure p2 of the pump 13 when the first pipeline 11 normally outputs pure water, and the p0 needs to be larger than the sum of p1 and p2, so as to avoid the problems that the pure water flows back through the backflow component 20 when the water purification system executes a filtration water purification procedure and the first pipeline 11 normally outputs pure water, which causes low water output efficiency, even water cannot be output, and the like. Moreover, the check valve with high opening pressure has the function of the check valve, raw water at the upstream of the pump 13 can be prevented from flowing through the check valve, the first filter element 14 can be ensured to normally filter purified water, the structure is more compact, and the whole structure of the water purification system is smaller and more exquisite.

When the water purification system is not used for a long time, for example, for more than 24 hours, organic matters on the surface of the first filter element 14 and pollutants in the attached tap water can permeate to the pure water side of the first filter element 14, so that heavy metals on the pure water side exceed the standard; the user need not use the back for a long time at water purification system before using for the first time, carries out the emission of a large amount of pure water, will permeate the pure water that has the heavy metal and arrange and just can obtain the pure water that can drink safely, not only wastes water resource, has increased user's latency moreover, and the use is felt relatively poor. In order to solve the above problem, as shown in fig. 1 and 2, the concentrated water discharge assembly 30 further includes a third switching valve 33, the third switching valve 33 is disposed on the third pipe 31, the third switching valve 33 is configured to control the switching of the third pipe 31, and when the third switching valve 33 is closed, the third pipe 31 is not circulated any more and the concentrated water is not discharged. When the water purification system is not used for a long time, the water purification system can execute a soaking program, a complete soaking program period is set as (24 +/-1) h, at the moment, the first switch valve 12, the water outlet structure 15 and the third switch valve 33 are closed, every x hours (2 is more than or equal to x is less than or equal to 23, and preferably 8 is more than or equal to x is less than or equal to 20), the pump 13 and the second switch valve 22 are opened for m seconds (10 is more than or equal to m is less than or equal to 60, and preferably 20 is more than or equal to x is less than or equal to 40), so that the pure water filtered by the first filter element 14 flows back to the upstream of the first filter element 14, pollutants such as organic matters, heavy metals and the like in the pure water also flow back to the upstream of the first filter element 14 and are intercepted at the concentrated water side of the first filter element 14, and the pollutant concentration of the soaking water at the pure water side can be greatly reduced. The interval time x hours and the backflow time m seconds can be set according to the user's use requirement and the raw water quality condition of the place of use, and the embodiment is not limited herein.

The utility model discloses water purification system, the pure water after first filter core 14 filters have two circulation routes, and the pure water can flow out through water structure 15 and supply the user to use, also can flow back to the upper reaches of pump 13 through second ooff valve 22, realizes the pure water backward flow. Before the water purification system is used for the first time, the returned pure water is used for cleaning the first filter element 14, so that a large amount of cleaning tap water is reduced, the dissolving capacity and the cleaning capacity of the pure water are stronger, the cleaning effect is improved, the surface of the first filter element 14 is subjected to pollutant accumulation in the tap water due to the reduction of the water amount of the cleaning tap water, and a new pollution risk to the first filter element 14 is avoided; in addition, in the daily use process of a user, when the water purification system is not used for a long time, the water purification system can execute a soaking program, the pure water flowing back through the second pipeline 21 can simultaneously flow back pollutants such as organic matters and heavy metals to the upstream of the first filter element 14, the concentration of the pollutants in the soaking water at the pure water side is greatly reduced, drinkable pure water can also flow out quickly after the water purification system is not used for a long time, the waiting time of the user is prevented from being increased, and the use experience of the user is better; in addition, new tap water is not needed to be introduced in the soaking process, the outlet of the concentrated water is closed, and the water is saved.

Preferably, as shown in fig. 1, the water purification assembly 10 further includes a second filter element 16, and the second filter element 16 is connected to the first pipe 11 and disposed upstream of the first on-off valve 12. The second filter element 16 is a pre-filter element, and can pre-treat the raw water in the first pipeline 11, so as to improve the cleanness of the raw water.

Specifically, the second filter element 16 is a PP pleated filter element or an activated carbon filter element. The PP folding filter element is a tubular filter element which is made by adopting nontoxic and tasteless polypropylene particles through heating, melting, spinning, drawing and receiving forming, has a folding filter membrane, large filtering area, large dirt receiving capacity, low pressure difference and long service life, and is suitable for pretreating raw water. The carbon fiber filter element takes active carbon or carbon fiber as a raw material, is a carbon rod filter element in common, has excellent adsorption performance, and has the advantages of high filtration precision, small pressure loss, large flow, large pollutant carrying capacity, long service life, no toxicity, no odor, no secondary pollution and the like.

Preferably, as shown in fig. 1, the water purification assembly 10 further includes a third filter element 17, and the third filter element 17 is connected to the first pipe 11 and disposed between the water outlet structure 15 and the first filter element 14. The third filter element 17 serves as a rear filter element for further filtering the pure water passing through the first filter element 14, thereby improving the degree of cleanness of the pure water.

Specifically, the third filter element 17 is a carbon rod filter element or a carbon fiber filter element. The carbon rod filter core takes the activated carbon as the raw material, and the carbon fiber filter core takes the carbon fiber as the raw material, so that the carbon rod filter core has excellent adsorption performance, has the advantages of high filtration precision, small pressure loss, large flow, large pollutant carrying capacity, long service life, no toxicity, no odor, no secondary pollution and the like, and is suitable for further filtering pure water.

Preferably, the water outlet structure 15 includes a one-way high-pressure switch 151 and a mechanical faucet 152 arranged in a flow direction, and the one-way high-pressure switch 151 is configured to close the first on-off valve 12 when the pressure of pure water in the first pipe 11 exceeds a set value. The one-way high-voltage switch 151 is in communication connection with the first switch valve 12, when pure water is not needed to be discharged, the mechanical faucet 152 is closed, the one-way high-voltage switch 151 can sense the pressure of the pure water, and then the first switch valve 12 can be controlled to be closed, so that raw water input is stopped. In addition, the one-way high-voltage switch 151 also has the function of a one-way valve, so that the pure water in the first pipeline 11 can be prevented from flowing reversely, and the mechanical faucet 152 can be ensured to normally output the pure water. The one-way high-voltage switch 151 and the mechanical faucet 152 are matched with each other, so that the water outlet structure 15 can be well sealed, and the phenomenon of water leakage cannot occur. The unidirectional high-voltage switch 151 implements opening and closing of the first switch valve 12 through a control module, and the control principle thereof is the prior art in the field, and the details of this embodiment are not described herein.

Preferably, the water outlet structure 15 may also include a second solenoid valve 153 and an induction tap 154 arranged along the flow direction, wherein the second solenoid valve 153 is configured to control the first pipeline 11 to be conducted or locked when the induction tap 154 is opened or closed; specifically, the sensing faucet 154 can sense a gesture motion or a touch operation of a user to be opened or closed by the user, and meanwhile, the control module controls the second solenoid valve 153 according to a signal sensed by the sensing faucet 154, and the motion of the second solenoid valve 153 can control the first pipeline 11 to be switched on or locked, so that the operation is more convenient and faster.

Example two

An embodiment of the utility model provides a water purifier, including the water purification system in the above-mentioned embodiment one. The water purifier further comprises a shell, a part of the water purifying system is arranged in the shell, one end of the first pipeline 11 extends out of the shell and is used for being connected with a tap water pipe, and the other end of the first pipeline 11 extends out of the shell and is convenient for guiding and installing the mechanical water faucet 152 or the induction water faucet 154 above the water tank. The water purifier also comprises a control module for controlling the water purifying system to execute a cleaning program, a soaking program or a water filtering and purifying program; the control principle and structure of the control module are the prior art in the field, and the detailed description of the embodiment is omitted here.

Before the water purifier is used for the first time, a cleaning program is executed, at the moment, the water purifying system closes the water outlet structure 15, the flow regulating valve 32 is in a small-flow working position, the first switch valve 12, the pump 13 and the second switch valve 22 are controlled to be opened, raw water enters the first filter element 14 through the first pipeline 11, filtered pure water flows back to the upstream of the pump 13 through the second pipeline 21 to be mixed with the raw water and then enters the first filter element 14, and the pure water is not directly discharged through the first pipeline 11; so, can save a large amount of raw water for washing, moreover, the solvency and the cleaning power of pure water are stronger, can improve the cleaning performance to first filter core 14, also can avoid a large amount of pollutants in the raw water for washing to attach the collection on the filter core surface, and above-mentioned cleaning procedure also is convenient for the user to clean the maintenance to first filter core 14 in daily use. Besides, when the water purification system is not used for a long time, the water purification system can execute a soaking program, a complete soaking program period is set as (24 +/-1) h, at this time, the first switch valve 12, the water outlet structure 15 and the third switch valve 33 are closed, every x hours (2 is not less than x is not less than 23, and preferably 8 is not less than x is not less than 20), the pump 13 and the second switch valve 22 are opened for m seconds (10 is not less than m is not less than 60, and preferably 20 is not less than x is not less than 40), so that the pure water filtered by the first filter element 14 flows back to the upstream of the first filter element 14, and pollutants such as organic matters, heavy metals and the like in the pure water also flow back to the upstream of the first filter element 14 and are intercepted at the concentrated water side of the first filter element 14, so that the pollutant concentration of the soaking water at the pure water side can be greatly reduced, the waiting time of a user is avoided from being increased, and the user experience is better; in addition, new tap water is not needed to be introduced in the soaking process, and the outlet of the concentrated water is closed, so that the water is saved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a water purification system, includes water purification subassembly (10), water purification subassembly (10) include first pipeline (11), first ooff valve (12), pump (13), first filter core (14) and play water structure (15) have set gradually along the flow direction of fluid on first pipeline (11), its characterized in that, water purification system still includes:

the backflow assembly (20) comprises a second pipeline (21) and a second switch valve (22), two ends of the second pipeline (21) are respectively communicated with the first pipeline (11), one end of the second pipeline (21) is located at the upstream of the pump (13), the other end of the second pipeline (21) is located between the pump (13) and the water outlet structure (15), and the second switch valve (22) is arranged on the second pipeline (21); and

the concentrated water discharging assembly (30) comprises a third pipeline (31), a flow regulating valve (32) and a third on-off valve (33), wherein the third pipeline (31) is communicated with the first filter element (14), and the flow regulating valve (32) and the third on-off valve (33) are arranged on the third pipeline (31).

2. The water purification system of claim 1, wherein the second on-off valve (22) comprises a one-way valve (221) and a first solenoid valve (222), the one-way valve (221) and the first solenoid valve (222) being both provided on the second pipe (21); or

The second switch valve (22) is a high opening pressure one-way valve.

3. The water purification system of claim 1, wherein the water purification assembly (10) further comprises:

a second filter element (16), the second filter element (16) being connected to the first conduit (11) and being arranged upstream of the first on-off valve (12).

4. A water purification system according to claim 3, wherein the second filter element (16) is a PP pleated filter element or an activated carbon filter element.

5. The water purification system of claim 1, wherein the water purification assembly (10) further comprises:

a third filter cartridge (17), said third filter cartridge (17) being connected to said first conduit (11) and being located between said outlet structure (15) and said first filter cartridge (14).

6. Water purification system according to claim 5, wherein the third filter element (17) is a carbon rod filter element or a carbon fiber filter element.

7. Water purification system according to any one of claims 1-6, wherein the first filter element (14) is an RO reverse osmosis membrane or a nanofiltration membrane.

8. The water purification system of any one of claims 1-6, wherein the water outlet structure (15) comprises a one-way high-pressure switch (151) and a mechanical tap (152) arranged in the flow direction, the one-way high-pressure switch (151) being configured to close the first on-off valve (12) when the pressure of the fluid in the first pipe (11) exceeds a set value.

9. The water purification system according to any one of claims 1-6, wherein the water outlet structure (15) comprises a second solenoid valve (153) and an induction tap (154) arranged in the flow direction of the fluid, the second solenoid valve (153) being configured to control the first pipe (11) to conduct or lock when the induction tap (154) is opened or closed.

10. A water purification machine comprising a housing, characterized in that it further comprises a water purification system according to any one of claims 1 to 9, part of said water purification system being housed in said housing.