CN114262029A

CN114262029A - Water purifier with flowmeter

Info

Publication number: CN114262029A
Application number: CN202111649743.8A
Authority: CN
Inventors: 宾倩韵; 孙天厚; 刘梦薇; 谈菲
Original assignee: Foshan Midea Qinghu Water Purification Equipment Co ltd; Midea Group Co Ltd
Current assignee: Foshan Midea Qinghu Water Purification Equipment Co ltd; Midea Group Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-04-01
Anticipated expiration: 2041-12-29
Also published as: CN114262029B

Abstract

The invention discloses a water purifier with a flow meter, which can enable waste water to flow back to a reverse osmosis filter element through a pipeline, be mixed with tap water and then enter the reverse osmosis filter element again for secondary filtration. The method can greatly reduce the discharge of waste water while ensuring the performance and the service life of the reverse osmosis filter element; meanwhile, the wastewater is connected with a domestic tap, and when the tap is opened, the wastewater discharge is completed, and the wastewater is secondarily utilized, so that the ecological environment-friendly requirement is met; in addition, a waste water direct discharging pipeline is also arranged and is used for directly discharging waste water when necessary; this system has the pure water backward flow branch road simultaneously, with the pure water backward flow to reverse osmosis filter core front end, washes and the former raw water of neutralization reverse osmosis filter core, and no residue old water just can drink, and quality of water is stable, provides pure fresh water all the time.

Description

Water purifier with flowmeter

Technical Field

The invention relates to the technical field of water purifiers, in particular to a water purifier with a flow meter.

Background

By the reverse osmosis process, water can be passed from a solution with a high concentration to a solution with a low concentration. Since inorganic ions, colloidal substances and macromolecular solutes cannot pass through the reverse osmosis cartridge, unwanted substances remain at the end of the high concentration solution and the lower concentration end of the solution receives purified pure water during this process. The process of the core component reverse osmosis filter element of the water purifier is actually a liquid concentration process, the salt content in water is continuously increased along with the water flowing through the surface of the reverse osmosis filter element, and the osmotic pressure of the water is also continuously increased. When the osmotic pressure increases to the pressure of the booster pump, water cannot flow into the clean water side through the reverse osmosis cartridge. The part of the water which fails to pass is the waste water generated in the process of making water.

The lower the amount of wastewater, the higher the recovery rate (water yield/total water intake 100%), the more easily colloids, organic pollutants and scale-forming ions are deposited on the surface of the reverse osmosis filter element, which causes the blockage of the reverse osmosis filter element, and the reduction of the water yield and the desalination rate. Therefore, in order to ensure the performance of the reverse osmosis filter element and prolong the service life of the reverse osmosis filter element, the recovery rate of the reverse osmosis system on the market is generally 50-60%. But the recovery rate is not high, so that the waste water is excessive, and the resource utilization is not facilitated.

After the water purifier does not work for a long time, the concentrated water on the side which is not filtered by the reverse osmosis filter element slowly permeates to the pure water side due to osmotic pressure, and the more the concentrated water permeates, so that the TDS value of the first cup of water is higher under the general condition, and direct drinking is not recommended. In addition, pure water filtered by the reverse osmosis filter element can be retained in the rear filter element for a long time, so that the risk of bacterial breeding of the rear filter element is increased, and the health potential safety hazard exists.

Disclosure of Invention

The invention mainly aims to provide a water purifier with a flow meter, and aims to solve the problem that the resource utilization is not facilitated due to excessive waste water generated by a waterway system in the conventional water purifier.

To achieve the above object, the present invention provides a water purifier with a flow meter, comprising:

the first reverse osmosis filter element is provided with a first water inlet, a first water outlet and a first waste water outlet;

the water outlet component is provided with a water outlet, a drinking water inlet and a domestic water inlet; the drinking water inlet is communicated with the first water outlet, and the domestic water inlet is communicated with the first wastewater outlet;

one end of the first wastewater direct discharge pipeline is communicated with the first wastewater port, a first flow limiting valve and a first switch valve are sequentially arranged on the first wastewater direct discharge pipeline along the flow direction of the first wastewater direct discharge pipeline, and the first flow limiting valve has a flow limiting effect;

the first branch is used for communicating a pipeline between the first flow limiting valve and the first switch valve with the first water inlet, and a first one-way valve with the flow direction facing the first water inlet is arranged on the first branch;

a high pressure valve assembly disposed on a flow path between the first water outlet and the drinking water inlet;

a flow meter provided in a flow path between the first waste water inlet and the domestic water inlet;

the electronic control unit is connected with the high-pressure valve assembly, the first switch valve and the flowmeter; the electronic control unit is used for controlling the first switch valve to be opened when the high-pressure valve assembly and the flow meter monitor that the water outlet assembly is not opened beyond a first preset time.

In one embodiment, a booster pump is arranged at the upstream of the first reverse osmosis filter element, the first branch is communicated with the first reverse osmosis filter element through the booster pump, the booster pump is electrically connected with the electronic control unit, and the electronic control unit is used for controlling the operation of the booster pump when monitoring a signal that the high-pressure valve assembly is triggered.

In an embodiment, the electronic control unit is further configured to control the first switch valve to open when a cumulative time period during which the high pressure valve assembly is triggered exceeds a second preset time period.

In an embodiment, the water pump further comprises a pure water backflow branch, a flow path between the first water outlet and the high-pressure valve assembly is communicated with one end of the pure water backflow branch, the other end of the pure water backflow branch is communicated with the pump inlet, and a second check valve is arranged on the pure water backflow branch.

In an embodiment, a second switch valve is further disposed on the pure water return branch, and the second switch valve is located upstream of the second one-way valve; the electronic control unit is used for controlling the second switch valve to be opened when the high-pressure valve assembly and the flow meter monitor that the water outlet assembly is not opened after the first preset time.

In an embodiment, the high pressure valve assembly comprises a high pressure switch and a third one-way valve, the high pressure switch being disposed downstream of the third one-way valve.

In an embodiment, the water outlet assembly includes a drinking water outlet assembly and a domestic water outlet assembly which are independent of each other, the drinking water outlet assembly has the drinking water inlet, the domestic water outlet assembly has the domestic water inlet, and the water outlet includes a drinking water outlet disposed on the drinking water outlet assembly and a domestic water outlet disposed on the domestic water outlet assembly.

In an embodiment, the reverse osmosis filter further comprises a second reverse osmosis filter element, the second reverse osmosis filter element is arranged on the flow path between the first waste water inlet and the first flow limiting valve, the second reverse osmosis filter element is provided with a second water inlet, a second water outlet and a second waste water inlet, the second water inlet is communicated with the first waste water inlet, the second waste water outlet is communicated with the water inlet end of the first flow limiting valve, and the second water outlet is communicated with the flow path between the first water outlet and the third one-way valve.

In one embodiment, the device further comprises a second reverse osmosis filter element, wherein the second reverse osmosis filter element is provided with a second water inlet, a second water outlet and a second waste water outlet, the second water inlet is communicated with the pump outlet, the second waste water outlet is communicated with one end of a second waste water direct discharge pipeline, a second flow limiting valve and a third switch valve are arranged on the second waste water direct discharge pipeline, and the second flow limiting valve has a flow limiting function; the third switch valve is positioned at the downstream of the second flow limiting valve, a flow path between the third switch valve and the second flow limiting valve is communicated with the pump inlet through a second branch, a fourth one-way valve is arranged on the second branch, and the flow direction of the fourth one-way valve flows from the second waste water port to the pump inlet; the second water outlet is communicated with a flow path between the first water outlet and the third one-way valve.

In an embodiment, the electronic control unit is further configured to open the third on/off valve when the cumulative time that the high pressure valve assembly is triggered exceeds the second preset value.

In one embodiment, the electric control assembly is configured to open the third on/off valve when it is monitored by the high pressure valve assembly and the flow meter that the water outlet assembly is not opened beyond the first preset time.

In one embodiment, the booster pump further comprises a preposed filter element which is arranged at the upstream of the booster pump, and the water yield of the preposed filter element is not less than 8L/min.

In one embodiment, the booster pump further comprises a preposed filter element which is arranged at the upstream of the booster pump, and the water yield of the preposed filter element is less than 8L/min.

In one embodiment, a water inlet valve is arranged between the upstream of the pre-filter element or the intersection of the flow path where the pump inlet is positioned and the first branch path and the pre-filter element.

In one embodiment, the reverse osmosis system further comprises a post-filter element arranged on a flow path between the first reverse osmosis filter element and the third one-way valve.

In one embodiment, the pre-filter element is a PP filter element, an activated carbon filter element, an ultrafiltration filter element or a nanofiltration filter element; the post-positioned filter element is an activated carbon filter element.

The invention provides a micro wastewater system with a mechanical faucet. And (3) returning the wastewater generated by the reverse osmosis filter element in the water purification process to the front of the reverse osmosis filter element through a pipeline, mixing the wastewater with tap water, and then feeding the wastewater into the reverse osmosis filter element again for secondary filtration.

The waste water that the reverse osmosis filter core produced except that before backward flow to the reverse osmosis filter core through the return line, this system still can link to each other the waste water that the reverse osmosis filter core produced with life tap or the original tap water faucet in user's family kitchen, opens life tap/tap water faucet through the user and accomplishes washing reverse osmosis filter core and waste water return line, and waste water discharge supplies the user to live and uses, accomplishes the reutilization to waste water, satisfies ecological environmental protection's requirement. In addition, a direct waste water discharge pipeline is provided, and the direct waste water discharge pipeline can be used for directly discharging waste water when necessary. The system is provided with a pure water backflow branch at the same time and used for enabling pure water to flow back to the front end of the reverse osmosis filter element, flushing and neutralizing raw water before the reverse osmosis filter element, no residual old water exists, a cup of water can be drunk, the water quality is stable, and pure fresh water is provided all the time.

When a user opens the domestic faucet, tap water with lower ion concentration can replace waste water with high ion concentration accumulated on the waste water side of the reverse osmosis filter element, so that the problem of the first cup of water is effectively solved; and because the domestic water flow is large, when passing through the reverse osmosis filter element, the water can wash away pollutants such as scale and organic matters deposited on the side surface of the wastewater of the reverse osmosis filter element, so that the scaling risk of the reverse osmosis filter element is reduced, and the service life of the reverse osmosis filter element is prolonged; meanwhile, the process can flush the wastewater return pipeline and the flow-limiting valve, so that the risk of blockage of the flow-limiting valve due to scaling is reduced, and the service life of the reverse osmosis filter element is further prolonged; when the domestic faucet is opened, the waste water generated and accumulated in the water production process can be discharged through the domestic faucet for domestic water use, and the waste water utilization is realized in the true sense.

When the drinking water taking time of a user reaches a certain value, the waste water direct discharging program is started, the initial level can be recovered within a short time of the TDS of the discharged water, and the influence on the drinking water flow is weak.

When the situation that a user does not use the water purifier for a long time is monitored, a pure water backflow procedure is started, replacement of original residual old water in the filter element and the waste water pipeline is completed, the problems of first cup of water and old water are solved, water quality is stable, and pure fresh water is provided all the time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic flow diagram of a water purifier according to a first embodiment of the present application with a flow meter;

FIG. 2 is a schematic flow diagram of a water purifier according to a second embodiment of the present application with a flow meter;

FIG. 3 is a schematic flow diagram of a water purifier according to a third embodiment of the present application with a flow meter;

FIG. 4 is a schematic flow diagram of a water purifier according to a fourth embodiment of the present application with a flow meter;

FIG. 5 is a schematic flow chart of a water purifier according to a fifth embodiment of the present invention with a flow meter;

FIG. 6 is a schematic flow chart showing a sixth embodiment of a water purifier according to the present application with a flow meter;

FIG. 7 is a schematic flow chart of a water purifier according to a seventh embodiment of the present application with a flow meter;

FIG. 8 is a schematic flow chart of a water purifier according to an eighth embodiment of the present application with a flow meter;

FIG. 9 is a schematic flow chart of a water purifier according to a ninth embodiment of the present application with a flow meter;

FIG. 10 is a schematic flow chart of a water purifier according to a tenth embodiment of the present application with a flow meter;

FIG. 11 is a schematic flow chart of a water purifier according to an eleventh embodiment of the present application with a flow meter;

FIG. 12 is a schematic flow chart showing a water purifier according to a twelfth embodiment of the present invention, the water purifier being equipped with a flow meter;

FIG. 13 is a schematic flow chart showing a thirteenth embodiment of a water purifier according to the present application with a flow meter;

FIG. 14 is a schematic flow chart showing a fourteenth embodiment of a water purifier according to the present application, the water purifier having a flow meter;

FIG. 15 is a schematic flow chart showing a fifteenth embodiment of a water purifier according to the present application with a flow meter;

FIG. 16 is a schematic flow chart showing a water purifier according to a sixteenth embodiment of the present invention equipped with a flow meter;

FIG. 17 is a schematic view showing a flow path of a water purifier according to a seventeenth embodiment of the present invention equipped with a flow meter;

FIG. 18 is a schematic flow chart showing a flow path of a water purifier according to an eighteenth embodiment of the present invention equipped with a flow meter;

FIG. 19 is a schematic flow chart showing a water purifier according to a nineteenth embodiment of the present invention equipped with a flow meter;

FIG. 20 is a schematic flow chart showing a twentieth embodiment of a water purifier according to the present invention equipped with a flow meter;

FIG. 21 is a schematic flow diagram of a water purifier according to a twenty-first embodiment of the present application with a flow meter;

FIG. 22 is a schematic flow chart showing a twenty-second embodiment of a water purifier according to the present application, the flow chart being a flow meter;

FIG. 23 is a schematic flow chart showing a twenty-third embodiment of a water purifier according to the present application, the flow chart showing a flow meter;

fig. 24 is a schematic flow chart of a twenty-fourth embodiment of a water purifier with a flow meter according to the present application.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The present invention provides a water purifier with a flow meter 19.

This water purifier includes: the device comprises a first reverse osmosis filter element 11a, a water outlet assembly 13, a first flow limiting valve 14a, a first switch valve 18a, a second switch valve 18b, a first one-way valve 15a, a second one-way valve 15b, a high-pressure valve assembly and a flow meter 19. A first reverse osmosis cartridge 11a having a first water inlet 111, a first water outlet 112 and a first waste water outlet 113; a water outlet unit 13 having a water outlet 133, a drinking water inlet 131, and a domestic water inlet 132; the drinking water inlet 131 is communicated with the first water outlet 112, and the domestic water inlet 132 is communicated with the first waste water inlet 113; first wastewater straight-line pipeline Q₁One end of the first waste water direct discharging pipeline Q is communicated with the first waste water outlet 113₁A first flow limiting valve 14a and a first switch valve 18a are sequentially arranged along the flow direction of the upper part, and the first flow limiting valve 14a has a flow limiting effect (in a flow limiting state, the flow is smaller, the flow can be 5% -80% in a fully open state, and preferably, the flow can be 10% -30% in the fully open state); first branch P₁A first branch line P connecting a pipe line between the first flow limiting valve 14a and the first switching valve 18a to the first water inlet 111₁A first check valve 15a is arranged on the first water inlet 111; a high pressure valve assembly provided on a flow path between the first water outlet 112 and the drinking water inlet 131; a flow meter 19 provided in a flow path between the first waste water port 113 and the domestic water inlet 132; an electric control unit connecting the high-pressure valve assembly, the first switching valve 18a and the flow meter 19; the electronic control unit is used for controlling the first switch valve 18a to be opened when the high-pressure valve assembly and the flow meter 19 detect that the water outlet assembly 13 is not opened for exceeding a first preset time (preferably 10min-10 h).

A booster pump 12 is arranged at the upstream of the first reverse osmosis filter element 11a, and a first branch P₁The booster pump 12 is communicated with the first reverse osmosis filter element 11a, the booster pump 12 is electrically connected with an electronic control unit, and the electronic control unit is used for controlling the operation of the booster pump 12 when a signal that the high-pressure valve component is triggered is monitored.

The electronic control unit is further configured to control the first on-off valve 18a to open when the accumulated time that the high pressure valve assembly is triggered exceeds a second preset time (preferably 1-5 min).

The water purifier further comprises a pure water backflow branch R, a flow path between the first water outlet 112 and the high-pressure valve assembly is communicated with one end of the pure water backflow branch R, the other end of the pure water backflow branch R is communicated with the pump inlet 121, and a second one-way valve 15b is arranged on the pure water backflow branch R.

The pure water return branch R is also provided with a second switch valve 18b, and the second switch valve 18b is positioned at the upstream of the second one-way valve 15 b; the electronic control unit is used for controlling the second switch valve 18b to be opened when the high-pressure valve assembly and the flow meter 19 detect that the water outlet assembly 13 is not opened beyond a first preset time.

The high pressure valve assembly comprises a high pressure switch 16 and a third one-way valve 15c, the high pressure switch 16 being disposed downstream of the third one-way valve 15 c.

The water outlet assembly 13 includes a drinking water outlet assembly 13a and a domestic water outlet assembly 13b which are independent of each other, the drinking water outlet assembly 13a has a drinking water inlet 131, the domestic water outlet assembly 13b has a domestic water inlet 132, and the water outlet 133 includes a drinking water outlet 131a disposed on the drinking water outlet assembly 13a and a domestic water outlet 131b disposed on the domestic water outlet assembly 13 b.

The invention provides a micro wastewater system with a mechanical faucet. And the wastewater generated by the first reverse osmosis filter element 11a in the water purification process flows back to the front of the first reverse osmosis filter element 11a through a pipeline, is mixed with tap water and then enters the first reverse osmosis filter element 11a again for secondary filtration.

Besides the wastewater generated by the first reverse osmosis filter element 11a flows back to the front of the first reverse osmosis filter element 11a through a return line, the system can also connect the wastewater of the first reverse osmosis filter element 11a with a domestic faucet or an original tap water faucet in a kitchen of a user, the first reverse osmosis filter element 11a and the wastewater return line are washed by opening the domestic faucet/tap water faucet by the user, the wastewater is discharged for the life of the user, the secondary utilization of the wastewater is completed, and the requirements of ecological environmental protection are met. In addition, a first wastewater direct discharge pipeline Q is also arranged₁And can be used for directly discharging waste water when necessary. The system is also provided with a pure water return branch R for connectingThe purified water flows back to the front end of the first reverse osmosis filter element 11a, the raw water before the first reverse osmosis filter element 11a is washed and neutralized, no residual old water exists, the first cup of water can be drunk, the water quality is stable, and pure fresh water is provided all the time.

The first embodiment is as follows: please refer to fig. 1. A mechanical double-water tap is added into the wastewater backflow system, the pure water outlet end of the first reverse osmosis filter element 11a is divided into two paths, one path is directly connected with the drinking water end of the double-water tap, a third one-way valve 15c and a high-pressure switch 16 are sequentially added on the pipeline, and the other path is a pure water backflow branch R used for returning the pure water to the front end of the first reverse osmosis filter element 11 a; the waste water outlet end of the first reverse osmosis filter element 11a is divided into two paths, one path is directly connected with the domestic water end of the double water taps, and a flow meter 19 is connected on the pipeline; the other path is a waste water return pipeline, waste water can flow back to the front of the booster pump 12 through a first flow limiting valve 14a, and a branch of the waste water return pipeline is a first waste water direct discharge pipeline Q₁And if necessary, the method is used for directly discharging the wastewater. The first flow restriction valve 14a on the waste water return line is a valve body having a flow restriction function. First wastewater straight-line pipeline Q₁The first switch valve 18a and the second switch valve 18b on the pure water return branch R are valve bodies having a full-on or full-off function; the third non return valve 15c, in combination with the high pressure switch 16, avoids frequent activation: due to the third check valve 15c, when the drinking water tap is closed, water is confined between the third check valve 15c and the tap, the water pressure is kept stable, and the high-pressure switch 16 receives a stable pressure signal and keeps an off state.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; after tap water flows into the first reverse osmosis filter element 11a, the tap water is divided into a path of pure water and a path of wastewater, the pure water is discharged by a drinking water faucet for drinking, the wastewater is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and then enters the first reverse osmosis filter element 11a again for filtration, and zero discharge of the wastewater is realized.

The user turns on the life tap (the life water inlet 132 is communicated with the water outlet 133): the flow meter 19 receives the signal and detects that the user turns on the life water faucet; tap water enters the first reverse osmosis filter element 11a through the booster pump 12 (the pump is not started) and then flows out of the waste water end of the first reverse osmosis filter element 11a in two ways, one way of the tap water is directly discharged through a domestic tap in a large flow rate, and the other way of the tap water flows back to the booster pump 12 through the first flow limiting valve 14a (the flow is limited and small), is mixed with the tap water and then enters the first reverse osmosis filter element 11a again to flush the waste water side of the first reverse osmosis filter element 11 a; namely, when a user opens the living water faucet, tap water with lower ion concentration can replace the waste water with high ion concentration accumulated at the waste water side of the first reverse osmosis filter element 11a, so that the problem of the first cup of water is effectively solved; moreover, as the domestic water flow is large, when passing through the first reverse osmosis filter element 11a, the water can flush out pollutants such as scale and organic matters deposited on the side surface of the wastewater of the first reverse osmosis filter element 11a, so that the scaling risk of the first reverse osmosis filter element 11a is reduced, and the service life of the first reverse osmosis filter element 11a is prolonged; meanwhile, the process can flush the wastewater return line and the first flow limiting valve 14a, the risk of blockage of the first flow limiting valve 14a due to scaling is reduced, and the service life of the first reverse osmosis filter element 11a is further prolonged. When the domestic faucet is opened, the waste water generated and accumulated in the water production process can be discharged through the domestic faucet for domestic water use, and the waste water utilization is realized in the true sense.

Direct discharge procedure of wastewater: when a user takes drinking water, because the waste water flows back, the TDS of the outlet water is increased along with the increase of the water taking time, therefore, after the drinking water taking time of the user reaches a certain value (the second preset time is preferably 1-5min), the waste water direct discharging program is started (the time is preferably 5-300s), the booster pump 12 is started, namely, the normal water making state is kept, the first switch valve 18a is opened, and the waste water generated by the first reverse osmosis filter element 11a is directly discharged along with the first waste water in the pipeline Q₁And the initial level of the effluent TDS can be recovered within a short time, and the influence on the flow of the drinking water is weak.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, and after tap water enters the first reverse osmosis filter element 11a, pure water returns to the booster pump 12 through the pure water return branch R and is mixed with the tap waterThe mixture enters the first reverse osmosis filter element 11a again, and raw water before the first reverse osmosis filter element 11a is washed and neutralized; the wastewater flows out from the wastewater end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The procedure can complete the replacement of original residual old water in the first reverse osmosis filter element 11a and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem. The pure water backflow program and the domestic water faucet opening program are selected to perform flushing on the system, namely after the process that the user drinks the drinking water is finished, if the flow meter 19 detects that the domestic water faucet is opened by the user within a certain time (preferably 10min-10h), the program is not started; if the flow meter 19 detects that the user does not turn on the life tap within a certain time (preferably 10min-10h), the pure water reflux program is started.

Example two: please refer to fig. 2. In this embodiment, a front filter element 17a is added to the front end of the booster pump 12, the type of the front filter element 17a may be PP with different forms, activated carbon with different forms, ultrafiltration, nanofiltration, or a composite filter element of the above materials, and the water flow rate of the front filter element 17a is less than 8L/min.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is roughly filtered by the preposed filter element 17a and then flows into the first reverse osmosis filter element 11a, and then is divided into a path of pure water and a path of waste water, the pure water is discharged by a drinking water faucet for drinking, the waste water flows back to the front of the booster pump 12 through the first flow limiting valve 14a and is mixed with the water discharged by the preposed filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the waste water is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); booster pump12, starting, opening a first switch valve 18a and a second switch valve 18b, mixing pure water with tap water before returning to the booster pump 12 through a pure water return branch R after the tap water enters the first reverse osmosis filter element 11a, and then entering the first reverse osmosis filter element 11a again to flush and neutralize the raw water before the first reverse osmosis filter element 11 a; the wastewater flows out from the wastewater end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The procedure can complete the replacement of original residual old water in the first reverse osmosis filter element 11a and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem. The pure water backflow program and the domestic water faucet opening program are selected to perform flushing on the system, namely after the process that the user drinks the drinking water is finished, if the flow meter 19 detects that the domestic water faucet is opened by the user within a certain time (preferably 10min-10h), the program is not started; if the flow meter 19 detects that the user does not turn on the life tap within a certain time (preferably 10min-10h), the pure water reflux program is started.

Example three: please refer to fig. 3. In this embodiment, based on the first embodiment, a post-filter 17b is added to the pure water outlet pipe of the first reverse osmosis filter 11a before the return branch, and the type of the post-filter 17b may be different forms of activated carbon.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is divided into a path of pure water and a path of waste water after flowing into the first reverse osmosis filter element 11a, the pure water is discharged by a drinking water faucet for drinking after passing through the post-positioned filter element 17b, and the waste water is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and then enters the first reverse osmosis filter element 11a again for filtration, so that zero discharge of the waste water is realized.

Pure water reflux procedure: when the user is monitored not to turn on the life tap (on) for a long time (the first preset time is preferably 10min-10h)Detected by the overflow meter 19), starting a pure water reflux program (preferably for 5-300 s); the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, after tap water enters the first reverse osmosis filter element 11a, pure water passes through the post-positioned filter element 17b, and then returns to the booster pump 12 through the pure water backflow branch R to be mixed with the tap water and then enters the first reverse osmosis filter element 11a again, and raw water in front of the first reverse osmosis filter element 11a is washed and neutralized; the wastewater flows out from the wastewater end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the first reverse osmosis filter element 11a, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example four: see fig. 4. In the embodiment, on the basis of the first embodiment, a front filter element 17a is added at the front end of the booster pump 12, and a rear filter element 17b is added on a pure water outlet pipeline of the first reverse osmosis filter element 11a and in front of a reflux branch; the type of the preposed filter element 17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, and the water outlet flow of the preposed filter element 17a is less than 8L/min; the kind of the post-filter 17b may be activated carbon of different forms.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is coarsely filtered by the front filter element 17a and then flows into the first reverse osmosis filter element 11a, and then is divided into a path of pure water and a path of wastewater, the pure water is discharged by a drinking water faucet for drinking after passing through the rear filter element 17b, and the wastewater flows back to the front of the booster pump 12 through the first flow limiting valve 14a and is mixed with the water discharged by the front filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, so that zero discharge of the wastewater is realized.

Pure water reflux procedure: when the user is monitored not to be opened for a long time (the first preset time is preferably 10min-10h)When the tap is in life (detected by the flowmeter 19), starting a pure water backflow program (preferably for 5-300 s); the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, after tap water enters the first reverse osmosis filter element 11a, pure water passes through the post-positioned filter element 17b, and then returns to the booster pump 12 through the pure water backflow branch R to be mixed with the tap water and then enters the first reverse osmosis filter element 11a again, and raw water in front of the first reverse osmosis filter element 11a is washed and neutralized; the wastewater flows out from the wastewater end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the first reverse osmosis filter element 11a, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example five: please refer to fig. 5. In this embodiment, a second reverse osmosis filter element 11b is added on the basis of the first embodiment. The second reverse osmosis filter element 11b is arranged on a flow path between the first waste water port 113 and the first flow limiting valve 14a, the second reverse osmosis filter element 11b is provided with a second water inlet 114, a second water outlet 115 and a second waste water port 116, the second water inlet 114 is communicated with the first waste water port 113, the second waste water port 116 is communicated with a water inlet end of the first flow limiting valve 14a, and the second water outlet 115 is communicated with a flow path between the first water outlet 112 and the third check valve 15 c. The first waste water inlet 113 is connected with the second water inlet 114, the second reverse osmosis filter element 11b performs secondary filtration on the waste water of the first reverse osmosis filter element 11a, and the waste water is mixed with tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and enters the first reverse osmosis filter element 11a again for secondary filtration.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; after tap water flows into the first reverse osmosis filter element 11a, pure water and waste water are divided into one path, the pure water flows to the third one-way valve 15c, the waste water flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration, the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112, the pure water is discharged through the drinking water faucet for drinking, the waste water is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and enters the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the waste water is realized.

The user turns on the life tap (the life water inlet 132 is communicated with the water outlet 133): the flow meter 19 receives the signal and detects that the user turns on the life water faucet; tap water enters the first reverse osmosis filter element 11a through the booster pump 12 and then flows out of the waste water end of the first reverse osmosis filter element 11a, enters the second reverse osmosis filter element 11b and then flows out of the waste water end of the second reverse osmosis filter element 11b in two paths, one path of the tap water is directly discharged through a domestic water faucet in a large flow rate, and the other path of the tap water flows back to the booster pump 12 through the first flow limiting valve 14a (with flow limitation and small flow rate) and then is mixed with the tap water and then enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again to flush the waste water sides of the two reverse osmosis filter elements; when a user opens the domestic faucet, tap water with lower ion concentration can replace waste water with high ion concentration accumulated on the waste water side of the two reverse osmosis filter elements, so that the problem of the first cup of water is effectively solved; and because the domestic water flow is large, when passing through the two reverse osmosis filter elements, pollutants such as scale and organic matters deposited on the side surfaces of the wastewater of the two reverse osmosis filter elements can be washed away, the scaling risk of the two reverse osmosis filter elements is reduced, and the service lives of the two reverse osmosis filter elements are prolonged; meanwhile, the process can flush the wastewater return line and the first flow limiting valve 14a, the risk of blockage of the first flow limiting valve 14a due to scaling is reduced, and the service lives of the two reverse osmosis filter elements are further prolonged. When the domestic faucet is opened, the waste water generated and accumulated in the water production process can be discharged through the domestic faucet for domestic water use, and the waste water utilization is realized in the true sense.

Direct discharge procedure of wastewater: when the user takes drinking water, the TDS of the outlet water can be increased along with the increase of the water taking time due to the backflow of the waste water, therefore, the designWhen the drinking water taking time of a user reaches a certain value (the second preset time is preferably 1-5min), the wastewater direct discharging program is started (the time is preferably 5-300s), the booster pump 12 is kept started, namely, the normal water production state is kept, the first switch valve 18a is opened, and the wastewater generated by the first reverse osmosis filter element 11a is directly discharged from the pipeline Q along with the first wastewater₁And the initial level of the effluent TDS can be recovered within a short time, and the influence on the flow of the drinking water is weak.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); when the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, tap water enters the first reverse osmosis filter element 11a and is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration and divided into a path of pure water and a path of wastewater, and the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112; the converged pure water returns to the booster pump 12 through the pure water return branch R, is mixed with tap water and then enters the two reverse osmosis filter elements again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out from the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of original residual water in the two reverse osmosis filter elements and the waste water pipeline, solves the problems of first cup of water and old water, has stable water quality, and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example six: please refer to fig. 6. In this embodiment, a front filter element 17a is added to the front end of the booster pump 12, the type of the front filter element 17a may be PP with different forms, activated carbon with different forms, ultrafiltration, nanofiltration, or a composite filter element of the above materials, and the water outlet flow rate of the front filter element 17a is less than 8L/min.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is roughly filtered by the front filter element 17a and then flows into the first reverse osmosis filter element 11a, the tap water is divided into one path of pure water and one path of wastewater, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is divided into one path of pure water and one path of wastewater after secondary filtration, the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112, the pure water is discharged for drinking through the drinking water faucet, the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and then is mixed with the water discharged from the front filter element 17a and enters the first reverse osmosis filter element 11a again for secondary filtration, and zero wastewater discharge is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); when the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, tap water enters the first reverse osmosis filter element 11a and is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration and divided into a path of pure water and a path of wastewater, and the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112; the converged pure water returns to the booster pump 12 through the pure water return branch R, is mixed with tap water and then enters the two reverse osmosis filter elements again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out from the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of original residual water in the two reverse osmosis filter elements and the waste water pipeline, solves the problems of first cup of water and old water, has stable water quality, and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids not having the use life water needs again after the user has got the drinking water, makes the residual water be detained in two for a long timeIn a reverse osmosis filter element and a wastewater return pipeline, the problem that the first cup of water and scale deposit affect the service life is caused.

Example seven: please refer to fig. 7. In this embodiment, based on the fifth embodiment, a post-filter 17b is added to the pure water outlet pipes of the first and second reverse

osmosis filter elements

11a and 11b before the pure water reflux branch R, and the type of the post-filter 17b may be different forms of activated carbon.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is divided into a path of pure water and a path of wastewater after flowing into the first reverse osmosis filter element 11a, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is divided into a path of pure water and a path of wastewater after secondary filtration, the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112, the pure water is discharged by a drinking water faucet for drinking after passing through the rear filter element 17b, the wastewater is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and enters the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

Pure water reflux procedure: when the fact that the user does not use the water purifier for a long time (the first preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300 s); the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, tap water enters the first reverse osmosis filter element 11a, and then is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration, then is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c, is converged with water flow from the first water outlet 112 and flows into the post-positioned filter element 17b, and then is mixed with the tap water before returning to the booster pump 12 through the pure water backflow branch R to enter the two reverse osmosis filter elements again, and raw water before flushing and neutralizing the two reverse osmosis filter elements is washed; the wastewater flows out from the wastewater side of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the two reverse osmosis filter elements, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; simultaneously prevent two reverse osmosis filter cores and the first flow limiting valve 14a from scaling, prolong the two reverse osmosis filter cores and the first flow limiting valveThe life of stream valve 14 a. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example eight: please refer to fig. 8. In this embodiment, on the basis of the fifth embodiment, a front filter element 17a17a is added at the front end of the booster pump 1212, and a rear filter element 17b17b is added on the pure water outlet pipe of the first reverse osmosis filter element 11a11a and the second reverse osmosis filter element 11b11b before the pure water return branch RR; the types of the front filter element 17a17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, and the water outlet flow of the front filter element 17a17a is less than 8L/min; the type of the post-filter 17b17b may be activated carbon of different forms.

The user turns on the drinking water tap (the drinking water inlet 131131 is communicated with the water outlet 133133): the high-voltage switch 1616 detects the pressure change, starts the booster pump 1212 and starts water production; tap water is coarsely filtered by the front filter element 17a17a and then flows into the first reverse osmosis filter element 11a11a, the tap water is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c15c, the wastewater flows into the second reverse osmosis filter element 11b11b and is divided into a path of pure water and a path of wastewater after secondary filtration, the pure water flows to the third one-way valve 15c15c and is converged with water flow from the first water outlet 112112, the pure water is discharged by a drinking water tap for drinking after passing through the rear filter element 17b17b, the wastewater flows back to the booster pump 1212 through the first flow limiting valve 14a14a and is mixed with the water discharged from the front filter element 17a17a and then flows into the first reverse osmosis filter element 11a11a for secondary filtration, and zero discharge of the wastewater is realized.

Pure water reflux procedure: when the fact that the user does not use the water purifier for a long time (the first preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300 s); the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, tap water enters the first reverse osmosis filter element 11a, and is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration, the pure water is divided into a path of pure water and a path of wastewater, and the pure water flows to the third one-way valve 15c and comes from the first outletThe water flow of the water port 112 joins and flows into the post-positioned filter element 17b, and then returns to the booster pump 12 through the pure water return branch R, and is mixed with the tap water to enter the two reverse osmosis filter elements again, so as to flush and neutralize the raw water in front of the two reverse osmosis filter elements; the wastewater flows out from the wastewater side of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the two reverse osmosis filter elements, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example nine: please refer to fig. 9. In this embodiment, a second reverse osmosis filter element 11b is added on the basis of the first embodiment, and is connected with the first reverse osmosis filter element 11a in parallel. The second reverse osmosis filter element 11b is provided with a second water inlet 114, a second water outlet 115 and a second waste water outlet 116, the second water inlet 114 is communicated with the pump outlet 122, and the second waste water outlet 116 and a second waste water direct discharge pipeline Q₂Is communicated with the first waste water direct discharge pipeline Q₂A second current limiting valve 14b and a third switch valve 18c are arranged on the valve body, and the second current limiting valve 14b has a current limiting function; a third on-off valve 18c is located downstream of the second flow limiting valve 14b, and a flow path between the third on-off valve 18c and the second flow limiting valve 14b passes through the second branch passage P₂In communication with the pump inlet 121, a second branch P₂A fourth check valve 15d is arranged on the first waste water inlet 121, and the flow direction of the fourth check valve 15d flows from the second waste water inlet 116 to the pump inlet 121; the second water outlet 115 communicates with the flow path between the first water outlet 112 and the third check valve 15 c.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; running water respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, is converged after being filtered, and is discharged from a drinking water faucet for drinking; the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b, is mixed with tap water and then enters the two reverse osmosis filter elements again for secondary filtration, and zero discharge of the wastewater is realized.

The user turns on the life tap (the life water inlet 132 is communicated with the water outlet 133): the flow meter 19 receives the signal and detects that the user turns on the life water faucet; tap water respectively enters a first reverse osmosis filter element 11a and a second reverse osmosis filter element 11b after passing through a booster pump 12 (the pump is not started), then respectively flows out of the waste water ends of the two reverse osmosis filter elements in two paths, one path of the tap water is converged in a large flow rate and then is directly discharged through a domestic water faucet, and the other path of the tap water flows back to the booster pump 12 through a first flow limiting valve 14a and a second flow limiting valve 14b (the flow is limited and small), is mixed with the tap water and then enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again to flush the waste water sides of the two reverse osmosis filter elements; namely, when a user opens the domestic faucet, tap water with lower ion concentration can replace the wastewater with high ion concentration accumulated at the wastewater side of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, so that the problem of the first cup of water is effectively solved; moreover, as the domestic water flow is large, when passing through the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, pollutants such as scale and organic matters deposited on the side surfaces of the wastewater of the two reverse osmosis filter elements can be washed away, the scaling risk of the two reverse osmosis filter elements is reduced, and the service lives of the two reverse osmosis filter elements are prolonged; meanwhile, the process can flush the wastewater return pipeline and the two flow limiting valves, the risk of blockage of the two flow limiting valves due to scaling is reduced, and the service lives of the two reverse osmosis filter elements are further prolonged. When the domestic faucet is opened, the waste water generated and accumulated in the water production process can be discharged through the domestic faucet for domestic water use, and the waste water utilization is realized in the true sense.

Direct discharge procedure of wastewater: when the user got the drinking water, because the waste water backward flow, it can increase along with the increase of water intaking time to go out water TDS, consequently, after the design was got the drinking water time of user and is reached a definite value (the preferred 1-5min of second preset time), start the straight row procedure of waste water (the preferred 5-300s of time), booster pump 12 keeps starting, keeps normal system water state promptly, first ooff valve 18a and third ooff valve 18c open, the waste water that two reverse osmosis filter core produced is discharged along with two straight row pipelines of waste water, can resume initial level in the play water TDS short time, and it is less to drinking water flux influence.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); starting the booster pump 12, opening a first switch valve 18a, a second switch valve 18b and a third switch valve 18c, enabling tap water to respectively enter a first reverse osmosis filter element 11a and a second reverse osmosis filter element 11b, filtering and converging the tap water, returning the tap water to the booster pump 12 through a pure water backflow branch R, mixing the tap water with the tap water, and then enabling the mixed tap water to enter the two reverse osmosis filter elements again to flush and neutralize the raw water in front of the two reverse osmosis filter elements; the waste water of the two reverse osmosis filter elements is directly discharged into two waste water direct discharge pipelines; the process can complete the replacement of the original residual water in the two reverse osmosis filter element waste water pipelines, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; simultaneously, the two reverse osmosis filter cores and the two flow limiting valves are prevented from scaling, and the service lives of the two reverse osmosis filter cores and the two flow limiting valves are prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

For this embodiment, it should be noted that the reason is that the first branch P₁And a second branch P₂The flow limiting valve and the one-way valve are arranged on the reverse osmosis filter, so that the adjusting effect is achieved, the wastewater recovery rate of the two reverse osmosis filter elements is greatly improved, and the flux of the two reverse osmosis filter elements is larger than 2 times that of a single reverse osmosis filter element under the comprehensive effect.

Example ten: please refer to fig. 10. In this embodiment, on the basis of the ninth embodiment, a pre-filter 17a is added to the front end of the booster pump 12; the type of the preposed filter element 17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, and the water outlet flow of the preposed filter element 17a is less than 8L/min.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is coarsely filtered by the preposed filter element 17a, then respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, is converged after being filtered, and is discharged by the drinking faucet for drinking; and the wastewater flows back to the front part of the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b, is mixed with the effluent of the front filter element 17a, and then enters the two reverse osmosis filter elements again for secondary filtration, so that zero discharge of the wastewater is realized.

Example eleven: please refer to fig. 11. In this embodiment, on the basis of the ninth embodiment, a post-filter element 17b is added to a pure water outlet water converging pipeline of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b before a pure water reflux branch R; the kind of the post-filter 17b may be activated carbon of different forms.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; running water respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, is filtered and then is converged, and is discharged by a drinking water tap for drinking after passing through the post-positioned filter element 17 b; the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b, is mixed with tap water and then enters the two reverse osmosis filter elements again for secondary filtration, and zero discharge of the wastewater is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); starting the booster pump 12, opening a first switch valve 18a, a second switch valve 18b and a third switch valve 18c, enabling tap water to respectively enter a first reverse osmosis filter element 11a and a second reverse osmosis filter element 11b, filtering, converging the filtered tap water to flow into a post-positioned filter element 17b, mixing the filtered tap water with the tap water before returning to the booster pump 12 through a pure water backflow branch R, and then entering two reverse osmosis filter elements again to flush and neutralize the raw water in front of the two reverse osmosis filter elements; the waste water of the two reverse osmosis filter elements is directly discharged into two waste water direct discharge pipelines; the process can complete the replacement of the original residual water in the two reverse osmosis filter elements, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; simultaneously, the two reverse osmosis filter cores and the two flow limiting valves are prevented from scaling, and the service lives of the two reverse osmosis filter cores and the two flow limiting valves are prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example twelve: please refer to fig. 12. In this embodiment, on the basis of the ninth embodiment, a front filter element 17a is added at the front end of the booster pump 12, and a rear filter element 17b is added on a pure water outlet water converging pipeline of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b and in front of a pure water return branch R; the type of the preposed filter element 17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, and the water outlet flow of the preposed filter element 17a is less than 8L/min; the kind of the post-filter 17b may be activated carbon of different forms.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is coarsely filtered by the preposed filter element 17a, then respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, is converged after being filtered, and is discharged by the drinking water faucet for drinking after passing through the postposition filter element 17 b; and the wastewater flows back to the front part of the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b, is mixed with the effluent of the front filter element 17a, and then enters the two reverse osmosis filter elements again for secondary filtration, so that zero discharge of the wastewater is realized.

Example thirteen: please refer to fig. 13. The system can also connect the waste water of the first reverse osmosis filter element 11a with the existing kitchen faucet of a user, not only can improve the utilization rate of the air and reduce the cost, but also can finish the washing of the first reverse osmosis filter element 11a and a waste water return pipeline by opening the tap water faucet by the user, and the waste water is discharged for the life of the user. A mechanical drinking water faucet is added into the wastewater backflow system, the pure water outlet end of the first reverse osmosis filter element 11a is divided into two paths, one path is directly connected with the drinking water faucet, a third one-way valve 15c and a high-voltage switch 16 are sequentially added on the pipeline, and the other path is a pure water backflow branch R used for returning pure water to the front end of the first reverse osmosis filter element 11 a; the waste water outlet end of the first reverse osmosis filter element 11a is divided into two paths, one path is directly connected with the existing kitchen faucet of a user home, and a flow meter 19 is arranged on the pipeline; the other path is a waste water return pipeline, waste water can flow back to the front of the booster pump 12 through a first flow limiting valve 14a, and a branch of the waste water return pipeline is a first waste water direct discharge pipeline Q₁And if necessary, the method is used for directly discharging the wastewater. The first flow limiting valve 14a on the waste water return pipeline is a valve body with a flow limiting function; first wastewater straight-line pipeline Q₁The first switch valve 18a and the second switch valve 18b on the pure water return branch R are valve bodies having a full-on or full-off function; the third non return valve 15c, in combination with the high pressure switch 16, avoids frequent activation: due to the third check valve 15c, when the drinking water tap is closed, water is confined between the third check valve 15c and the tap, the water pressure is kept stable, and the high-pressure switch 16 receives a stable pressure signal and keeps an off state.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; after tap water flows into the first reverse osmosis filter element 11a, the tap water is divided into a path of pure water and a path of wastewater, the pure water is discharged by a drinking water faucet for drinking, the wastewater is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and then enters the first reverse osmosis filter element 11a again for filtration, and zero discharge of the wastewater is realized.

The user turns on the tap (the domestic water inlet 132 is communicated with the domestic water outlet 131 b): the flow meter 19 receives the signal and detects that the tap is turned on by the user; tap water enters the first reverse osmosis filter element 11a through the booster pump 12 (the pump is not started) and then flows out of the waste water end of the first reverse osmosis filter element 11a in two ways, one way of the tap water is directly discharged through a tap water tap, and the other way of the tap water flows back to the booster pump 12 through the first flow limiting valve 14a (the flow is limited and small), is mixed with the tap water and then enters the first reverse osmosis filter element 11a again to flush the waste water side of the first reverse osmosis filter element 11 a; namely, when a user opens the tap water faucet, tap water with lower ion concentration can replace the waste water with high ion concentration accumulated at the waste water side of the first reverse osmosis filter element 11a, so that the problem of the first cup of water is effectively solved; moreover, as the flow rate of tap water is large, when the tap water passes through the first reverse osmosis filter element 11a, pollutants such as scale and organic matters deposited on the side surface of the wastewater of the first reverse osmosis filter element 11a can be washed away, the scaling risk of the first reverse osmosis filter element 11a is reduced, and the service life of the first reverse osmosis filter element 11a is prolonged; meanwhile, the process can flush the wastewater return line and the first flow limiting valve 14a, the risk of blockage of the first flow limiting valve 14a due to scaling is reduced, and the service life of the first reverse osmosis filter element 11a is further prolonged. When the tap is opened, the waste water generated and accumulated in the water making process can be discharged through the tap for domestic water, so that the waste water utilization is realized in a real sense.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); the booster pump 12 is started, the first switch valve18a and a second switch valve 18b are opened, after tap water enters the first reverse osmosis filter element 11a, pure water returns to the booster pump 12 through the pure water return branch R, is mixed with the tap water and enters the first reverse osmosis filter element 11a again, and the raw water in front of the first reverse osmosis filter element 11a is washed and neutralized; the wastewater flows out from the wastewater end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The procedure can complete the replacement of original residual old water in the first reverse osmosis filter element 11a and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example fourteen: please refer to fig. 14. In the embodiment, on the basis of the thirteenth embodiment, a large-flux front-mounted filter element 17a is added at the front end of the booster pump 12, the type of the front-mounted filter element 17a can be PP in different forms, activated carbon in different forms, ultrafiltration, nanofiltration, composite filter elements made of the above materials and the like, the large-flux specification is adopted, the water outlet flow of the front-mounted filter element 17a is not less than 8L/min, and kitchen water is not limited and is equal to tap water.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is roughly filtered by the large-flux preposed filter element 17a and flows into the first reverse osmosis filter element 11a, then is divided into a path of pure water and a path of wastewater, the pure water is discharged by a drinking water faucet for drinking, the wastewater flows back to the front of the booster pump 12 through the first flow limiting valve 14a and is mixed with the water discharged by the large-flux preposed filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, and the tap water enters the first reverse osmosis filter element 1After 1a, the pure water returns to the booster pump 12 through the pure water return branch R, is mixed with tap water and enters the first reverse osmosis filter element 11a again, and the pure water washes and neutralizes the raw water in front of the first reverse osmosis filter element 11 a; the wastewater flows out from the wastewater end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The procedure can complete the replacement of original residual old water in the first reverse osmosis filter element 11a and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example fifteen: please refer to fig. 15. In this embodiment, on the basis of the thirteenth embodiment, a post-filter 17b is added to the pure water outlet pipe of the first reverse osmosis filter 11a before the return pipe, and the type of the post-filter 17b can be different forms of activated carbon.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is divided into a path of pure water and a path of waste water after flowing into the first reverse osmosis filter element 11a, the pure water is discharged by a drinking water faucet for drinking after passing through the post-positioned filter element 17b, and the waste water is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and then enters the first reverse osmosis filter element 11a again for filtration, so that zero discharge of the waste water is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, after tap water enters the first reverse osmosis filter element 11a, pure water passes through the post-positioned filter element 17b, and then returns to the booster pump 12 through the pure water backflow branch R to be mixed with the tap water and then enters the first reverse osmosis filter element 11a again, and raw water in front of the first reverse osmosis filter element 11a is washed and neutralized; the wastewater flows out from the wastewater end and is directly discharged into the first wastewater straight-discharge pipeWay Q₁(ii) a The process can complete the replacement of the original residual water in the first reverse osmosis filter element 11a, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example sixteen: please refer to fig. 16. In the embodiment, on the basis of the thirteenth embodiment, a large-flux front filter element 17a is added at the front end of the booster pump 12, and a rear filter element 17b is added on a pure water outlet pipeline of the first reverse osmosis filter element 11a and in front of a return pipeline; the types of the preposed filter element 17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, the large-flux specification is adopted, the water outlet flow of the preposed filter element 17a is more than or equal to 8L/min, and the kitchen water is not limited and is equal to tap water; the kind of the post-filter 17b may be activated carbon of different forms.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is roughly filtered by the large-flux preposed filter element 17a and flows into the first reverse osmosis filter element 11a, then is divided into a path of pure water and a path of wastewater, the pure water is discharged by a drinking water faucet for drinking after passing through the postposition filter element 17b, and the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and is mixed with the water discharged by the large-flux preposed filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, so that zero discharge of the wastewater is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, after the tap water enters the first reverse osmosis filter element 11a, the pure water passes through the post-filter element 17b and returns to the booster pump 12 through the pure water return branch R to be mixed with the tap waterThe mixture enters the first reverse osmosis filter element 11a again, and raw water before the first reverse osmosis filter element 11a is washed and neutralized; the wastewater flows out from the wastewater end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the first reverse osmosis filter element 11a, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example seventeen: please refer to fig. 17. This embodiment adds a second reverse osmosis cartridge 11b to the thirteenth embodiment. The second reverse osmosis filter element 11b is arranged on a flow path between the first waste water port 113 and the first flow limiting valve 14a, the second reverse osmosis filter element 11b is provided with a second water inlet 114, a second water outlet 115 and a second waste water port 116, the second water inlet 114 is communicated with the first waste water port 113, the second waste water port 116 is communicated with a water inlet end of the first flow limiting valve 14a, and the second water outlet 115 is communicated with a flow path between the first water outlet 112 and the third check valve 15 c. The water outlet assembly 13 includes a drinking water outlet assembly 13a and a domestic water outlet assembly 13b which are independent of each other, the drinking water outlet assembly 13a has a drinking water inlet 131, the domestic water outlet assembly 13b has a domestic water inlet 132, and the water outlet 133 includes a drinking water outlet 131a disposed on the drinking water outlet assembly 13a and a domestic water outlet 131b disposed on the domestic water outlet assembly 13 b.

The second reverse osmosis filter element 11b performs secondary filtration on the wastewater in the first reverse osmosis filter element 11a, and the wastewater is mixed with tap water before returning to the booster pump 12 through the first flow limiting valve 14a and enters the first reverse osmosis filter element 11a again for secondary filtration.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; after tap water flows into the first reverse osmosis filter element 11a, pure water and waste water are divided into one path, the pure water flows to the third one-way valve 15c, the waste water flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration, the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112, the pure water is discharged through the drinking water faucet for drinking, the waste water is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and enters the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the waste water is realized.

The user turns on the tap (the domestic water inlet 132 is communicated with the domestic water outlet 131 b): the flow meter 19 receives the signal and detects that the tap is turned on by the user; tap water enters the first reverse osmosis filter element 11a through the booster pump 12, flows out of the wastewater end of the first reverse osmosis filter element 11a, enters the second reverse osmosis filter element 11b, then flows out of the wastewater end of the second reverse osmosis filter element 11b in two paths, one path of the tap water is directly discharged with a large flow rate through a tap water faucet, and the other path of the tap water flows back to the booster pump 12 through the first flow limiting valve 14a (with flow limitation and small flow rate) and then is mixed with the tap water, and then enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again to flush the wastewater sides of the two reverse osmosis filter elements; when a user opens the tap water faucet, tap water with lower ion concentration can replace waste water with high ion concentration accumulated on the waste water side of the two reverse osmosis filter elements, so that the problem of the first cup of water is effectively solved; and because the domestic water flow is large, when passing through the two reverse osmosis filter elements, pollutants such as scale and organic matters deposited on the side surfaces of the wastewater of the two reverse osmosis filter elements can be washed away, the scaling risk of the two reverse osmosis filter elements is reduced, and the service lives of the two reverse osmosis filter elements are prolonged; meanwhile, the process can flush the wastewater return line and the first flow limiting valve 14a, the risk of blockage of the first flow limiting valve 14a due to scaling is reduced, and the service lives of the two reverse osmosis filter elements are further prolonged. When the tap is opened, the waste water generated and accumulated in the water making process can be discharged through the tap, so that the waste water utilization is realized in a real sense.

Direct discharge procedure of wastewater: when the user is getting the drinking water, because the waste water flows back, the TDS of the outlet water can be taken along with the waterThe water consumption time is increased, therefore, after the drinking water taking time of a user reaches a certain value (the second preset time is preferably 1-5min), the waste water direct discharging program is started (the time is preferably 5-300s), the booster pump 12 is kept started, namely, the normal water production state is kept, the first switch valve 18a is opened, and the waste water generated by the first reverse osmosis filter element 11a is directly discharged to the pipeline Q along with the first waste water₁And the initial level of the effluent TDS can be recovered within a short time, and the influence on the flow of the drinking water is weak.

Example eighteen: please refer to fig. 18. In the embodiment, on the basis of seventeenth embodiment, a large-flux front-mounted filter element 17a is added at the front end of the booster pump 12, the types of the front-mounted filter element 17a can be PP in different forms, activated carbon in different forms, ultrafiltration, nanofiltration, composite filter elements made of the above materials and the like, the large-flux specification is adopted, the water outlet flow of the front-mounted filter element 17a is not less than 8L/min, and kitchen water is not limited and is equal to tap water.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is roughly filtered by the large-flux preposed filter element 17a and then flows into the first reverse osmosis filter element 11a, and then is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is secondarily filtered, the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112, the pure water is discharged for drinking through the drinking water faucet, the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and is mixed with the water discharged from the large-flux preposed filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); when the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, tap water enters the first reverse osmosis filter element 11a and is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration and divided into a path of pure water and a path of wastewater, and the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112; the converged pure water returns to the booster pump 12 through the pure water return branch R, is mixed with tap water and then enters the two reverse osmosis filter elements again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out from the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of original residual water in the two reverse osmosis filter elements and the waste water pipeline, solves the problems of first cup of water and old water, has stable water quality, and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under normal conditions, a user can open the life faucet to finish the operation of connecting the two reverse osmosis filter elements andthe washing of waste water return line, this procedure mainly used avoid having no use life water needs again after the user has got the drinking water, make the residual water be detained for a long time in two reverse osmosis filter cores and waste water return line, cause first glass of water and incrustation scale deposit and influence life's problem.

Example nineteenth: please refer to fig. 19. In this embodiment, on the basis of the seventeenth embodiment, a post-filter 17b is added to the pure water outlet pipes of the first and second reverse

osmosis filter elements

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is divided into a path of pure water and a path of wastewater after flowing into the first reverse osmosis filter element 11a, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is divided into a path of pure water and a path of wastewater after secondary filtration, the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112, the pure water is discharged by a drinking water faucet for drinking after passing through the rear filter element 17b, the wastewater is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and enters the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); when the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, tap water enters the first reverse osmosis filter element 11a and is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration and divided into a path of pure water and a path of wastewater, and the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112; the pure water merged and flowed into the post-positioned filter element 17b returns to the booster pump 12 through the pure water return branch R, is mixed with tap water and enters the two reverse osmosis filter elements again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out from the wastewater side of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The procedure can be used for completing the operation of two reverse osmosis filter elements, the post-positioned filter element 17b and the waste water pipelineThe replacement of the original residual water solves the problems of first cup water and old water, the water quality is stable, and pure fresh water is provided all the time; meanwhile, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under the normal condition, the user opens life tap (domestic water inlet 132 switches on with outlet 133) and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use domestic water needs again after the user has got the drinking water, makes the residual water be detained for a long time in two reverse osmosis filter cores and waste water return line, causes first glass of water and incrustation scale deposit and influences life's problem.

Example twenty: please refer to fig. 20. In this embodiment, on the basis of seventeen, a large-flux pre-filter 17a is added at the front end of the booster pump 12, and a post-filter 17b is added on the pure water outlet pipeline of the first reverse osmosis filter 11a1, 2 and before the pure water reflux branch R; the types of the preposed filter element 17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, the large-flux specification is adopted, the water outlet flow of the preposed filter element 17a is more than or equal to 8L/min, and the kitchen water is not limited and is equal to tap water; the kind of the post-filter 17b may be activated carbon of different forms.

The user opens the drinking water tap: (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is coarsely filtered by the preposed filter element 17a and then flows into the first reverse osmosis filter element 11a, and then is divided into a path of pure water and a path of waste water, the pure water flows to the third one-way valve 15c, the waste water flows into the second reverse osmosis filter element 11b and is divided into a path of pure water and a path of waste water after secondary filtration, the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112, the pure water is discharged by a drinking water faucet for drinking after flowing through the postposition filter element 17b, the waste water flows back to the booster pump 12 through the first flow limiting valve 14a and is mixed with the water discharged from the large-flux preposed filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the waste water is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); the booster pump 12 is started up and,the first switch valve 18a and the second switch valve 18b are opened, tap water is divided into a path of pure water and a path of wastewater after entering the first reverse osmosis filter element 11a, the pure water flows to the third one-way valve 15c, the wastewater flows into the second reverse osmosis filter element 11b and is divided into a path of pure water and a path of wastewater after secondary filtration, and the pure water flows to the third one-way valve 15c and is converged with water flow from the first water outlet 112; the pure water merged and flowed into the post-positioned filter element 17b returns to the booster pump 12 through the pure water return branch R, is mixed with tap water and enters the two reverse osmosis filter elements again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out from the wastewater side of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the two reverse osmosis filter elements, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under the normal condition, the user opens life tap (domestic water inlet 132 switches on with outlet 133) and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use domestic water needs again after the user has got the drinking water, makes the residual water be detained for a long time in two reverse osmosis filter cores and waste water return line, causes first glass of water and incrustation scale deposit and influences life's problem.

Example twenty one: please refer to fig. 21. In this embodiment, a second reverse osmosis filter element 11b is added to the thirteenth embodiment, in parallel with the first reverse osmosis filter element 11 a. The second reverse osmosis filter element 11b is provided with a second water inlet 114, a second water outlet 115 and a second waste water outlet 116, the second water inlet 114 is communicated with the pump outlet 122, and the second waste water outlet 116 and a second waste water direct discharge pipeline Q₂Is communicated with the first waste water direct discharge pipeline Q₂A second current limiting valve 14b and a third switch valve 18c are arranged on the valve body, and the second current limiting valve 14b has a current limiting function; a third on/off valve 18c is located downstream of the second flow limiting valve 14b, and a flow path between the third on/off valve 18c and the second flow limiting valve passes through the second branch P₂In communication with the pump inlet 121, a second branch P₂A fourth check valve 15d is provided thereon,the fourth check valve 15d flows from the second waste water port 116 to the pump inlet 121; the second water outlet 115 communicates with the flow path between the first water outlet 112 and the third check valve 15 c. The water outlet assembly 13 includes a drinking water outlet assembly 13a and a domestic water outlet assembly 13b which are independent of each other, the drinking water outlet assembly 13a has a drinking water inlet 131, the domestic water outlet assembly 13b has a domestic water inlet 132, and the water outlet 133 includes a drinking water outlet 131a disposed on the drinking water outlet assembly 13a and a domestic water outlet 131b disposed on the domestic water outlet assembly 13 b.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; running water respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, is converged after being filtered, and is discharged from a drinking water faucet for drinking; the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b, is mixed with tap water and then enters the two reverse osmosis filter elements again for secondary filtration, and zero discharge of the wastewater is realized.

The user turns on the tap (the domestic water inlet 132 is communicated with the domestic water outlet 131 b): the flow meter 19 receives the signal and detects that the tap is turned on by the user; running water respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b after passing through the booster pump 12 and then respectively flows out from the waste water sides of the two reverse osmosis filter elements in two paths, one path of running water is converged in a large flow rate and then directly discharged through a running water faucet, and the other path of running water flows back to the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b (with flow limiting and smaller flow rate) and then is mixed with the running water and then enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again to flush the waste water sides of the two reverse osmosis filter elements. Namely, when a user opens a living water tap (the living water inlet 132 is communicated with the living water outlet 131 b), tap water with lower ion concentration can replace the wastewater with high ion concentration accumulated at the wastewater side of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, so that the problem of first cup of water is effectively solved; moreover, as the domestic water flow is large, when passing through the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, pollutants such as scale and organic matters deposited on the side surfaces of the wastewater of the two reverse osmosis filter elements can be washed away, the scaling risk of the two reverse osmosis filter elements is reduced, and the service lives of the two reverse osmosis filter elements are prolonged; meanwhile, the process can flush the wastewater return pipeline and the first flow limiting valve 14a and the second flow limiting valve 14b, so that the risk of blockage of the two flow limiting valves due to scaling is reduced, and the service lives of the two reverse osmosis filter elements are further prolonged. When the tap is opened, the waste water generated and accumulated in the water making process can be discharged through the tap, so that the waste water utilization is realized in a real sense.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); starting the booster pump 12, opening a first switch valve 18a, a second switch valve 18b and a third switch valve 18c, enabling tap water to respectively enter a first reverse osmosis filter element 11a and a second reverse osmosis filter element 11b, filtering and converging the tap water, returning the tap water to the booster pump 12 through a pure water backflow branch R, mixing the tap water with the tap water, and then enabling the mixed tap water to enter the two reverse osmosis filter elements again to flush and neutralize the raw water in front of the two reverse osmosis filter elements; the wastewater of the two reverse osmosis filter elements is directly discharged into two wastewater direct discharge pipelines; the process can complete the replacement of the waste water of the two reverse osmosis filter elements and the original residual water in the pipeline, solves the problems of first cup of water and old water, has stable water quality, and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter cores and the first flow limiting valve 14a and the second flow limiting valve 14b are prevented from scaling, and the service lives of the two reverse osmosis filter cores and the two flow limiting valves are prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example twenty two: please refer to fig. 22. In this embodiment, on the basis of twenty-one, a large-flux pre-filter 17a is added at the front end of the booster pump 12; the types of the preposed filter element 17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, all adopt large-flux specifications, the water outlet flow of the preposed filter element 17a is more than or equal to 8L/min, the kitchen water is not limited, and the kitchen water is equivalent to tap water.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is coarsely filtered by the preposed filter element 17a, then respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, is converged after being filtered, and is discharged by the drinking faucet for drinking; and the wastewater flows back to the front of the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b and is mixed with the water discharged from the large-flux preposed filter element 17a, and then enters the two reverse osmosis filter elements for secondary filtration, so that zero discharge of the wastewater is realized.

Example twenty three: please refer to fig. 23. In this embodiment, on the basis of twenty-one, a post-filter element 17b is added to a pure water outlet converging pipeline of a first reverse osmosis filter element 11a and a second reverse osmosis filter element 11b before a pure water reflux branch R; the kind of the post-filter 17b may be activated carbon of different forms.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 1616 detects the pressure change, starts the booster pump 12 and starts water production; running water respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, is filtered and then is converged, and is discharged by a drinking water tap for drinking after passing through the post-positioned filter element 17 b; the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b, is mixed with tap water and then enters the two reverse osmosis filter elements again for secondary filtration, and zero discharge of the wastewater is realized.

Pure water reflux procedure: when the user is monitored not to open the life tap (detected by the flow meter 19) for a long time (the first preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300 s); starting the booster pump 12, opening a first switch valve 18a, a second switch valve 18b and a third switch valve 18c, enabling tap water to respectively enter a first reverse osmosis filter element 11a and a second reverse osmosis filter element 11b, filtering, converging the filtered tap water to flow into a post-positioned filter element 17b, mixing the filtered tap water with the tap water before returning to the booster pump 12 through a pure water backflow branch R, and then entering two reverse osmosis filter elements again to flush and neutralize the raw water in front of the two reverse osmosis filter elements; the wastewater of the two reverse osmosis filter elements is directly discharged into two wastewater direct discharge pipelines; the process can complete the replacement of the waste water of the two reverse osmosis filter elements, the rear filter element 17b and the original residual water in the pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter cores and the first flow limiting valve 14a and the second flow limiting valve 14b are prevented from scaling, and the service lives of the two reverse osmosis filter cores and the two flow limiting valves are prolonged. Under the normal condition, the user opens life tap (domestic water inlet 132 switches on with outlet 133) and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use domestic water needs again after the user has got the drinking water, makes the residual water be detained for a long time in two reverse osmosis filter cores and waste water return line, causes first glass of water and incrustation scale deposit and influences life's problem.

Example twenty-four: please refer to fig. 24. In the embodiment, on the basis of twenty-one, a large-flux front filter element 17a is added at the front end of the booster pump 12, and a rear filter element 17b is added on a pure water outlet water converging pipeline of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b and in front of a pure water backflow branch R; the types of the preposed filter element 17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, the large-flux specification is adopted, the water outlet flow of the preposed filter element 17a is more than or equal to 8L/min, and the kitchen water is not limited and is equal to tap water; the kind of the post-filter 17b may be activated carbon of different forms.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): the high-voltage switch 16 detects the pressure change, starts the booster pump 12 and starts water production; tap water is coarsely filtered by the preposed filter element 17a, then respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, is converged after being filtered, and is discharged by the drinking water faucet for drinking after passing through the postposition filter element 17 b; and the wastewater flows back to the front of the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b and is mixed with the water discharged from the large-flux preposed filter element 17a, and then enters the two reverse osmosis filter elements for secondary filtration, so that zero discharge of the wastewater is realized.

To facilitate the control of the inflow, it is possible to provide the flow path upstream of the pre-filter 17a or at the pump inlet 121 and the first branch P on the basis of the above-described embodiment₁A water inlet valve is arranged between the junction and the front filter element 17a, and the water inlet valve is a valve body with a full-open or full-close function.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A water purifier with a flow meter, comprising:

2. The water purifier with flow meter according to claim 1, wherein a booster pump is disposed upstream of the first reverse osmosis filter element, the first branch is communicated with the first reverse osmosis filter element through the booster pump, the booster pump is electrically connected to the electronic control unit, and the electronic control unit is configured to control the operation of the booster pump when a signal that the high pressure valve assembly is triggered is detected.

3. The water purifier with flow meter according to claim 2, wherein the electronic control unit is further configured to control the first on-off valve to open when the accumulated time that the high-pressure valve assembly is activated exceeds a second preset time.

4. The water purifier with a flow meter according to claim 3, further comprising a pure water return branch, wherein a flow path between the first water outlet and the high pressure valve assembly communicates with one end of the pure water return branch, the other end of the pure water return branch communicates with the pump inlet, and a second check valve is provided on the pure water return branch.

5. The water purifier with flow meter according to claim 4, wherein a second on-off valve is further provided on said pure water return branch, said second on-off valve being located upstream of said second check valve; the electronic control unit is used for controlling the second switch valve to be opened when the high-pressure valve assembly and the flow meter monitor that the water outlet assembly is not opened after the first preset time.

6. The water purifier with flow meter according to any one of claims 5, wherein said high pressure valve assembly comprises a high pressure switch and a third check valve, said high pressure switch being disposed downstream of said third check valve.

7. The water purifier with a flow meter according to claim 6, wherein the water outlet assembly includes a drinking water outlet assembly and a domestic water outlet assembly which are independent of each other, the drinking water outlet assembly has the drinking water inlet, the domestic water outlet assembly has the domestic water inlet, and the water outlet includes a drinking water outlet provided in the drinking water outlet assembly and a domestic water outlet provided in the domestic water outlet assembly.

8. The water purifier with flow meter of claim 6, further comprising a second reverse osmosis cartridge disposed in the flow path between the first waste water port and the first flow restriction valve, the second reverse osmosis cartridge having a second water inlet in communication with the first waste water port, a second water outlet in communication with the water inlet end of the first flow restriction valve, and a second waste water port in communication with the flow path between the first water outlet and the third one-way valve.

9. The water purifier with a flow meter according to any one of claim 8, wherein the water outlet assembly comprises a drinking water outlet assembly and a domestic water outlet assembly which are independent of each other, the drinking water outlet assembly has the drinking water inlet, the domestic water outlet assembly has the domestic water inlet, and the water outlet comprises a drinking water outlet provided in the drinking water outlet assembly and a domestic water outlet provided in the domestic water outlet assembly.

10. The water purifier with a flow meter according to claim 6, further comprising a second reverse osmosis filter element having a second water inlet, a second water outlet and a second waste water outlet, the second water inlet communicating with the pump outlet, the second waste water outlet communicating with one end of a second waste water straight discharge line, the second waste water straight discharge line being provided with a second flow restriction valve having a flow restriction function and a third on/off valve; the third switch valve is positioned at the downstream of the second flow limiting valve, a flow path between the third switch valve and the second flow limiting valve is communicated with the pump inlet through a second branch, a fourth one-way valve is arranged on the second branch, and the flow direction of the fourth one-way valve flows from the second waste water port to the pump inlet; the second water outlet is communicated with a flow path between the first water outlet and the third one-way valve.

11. The water purifier with flow meter according to claim 10, wherein said electronic control unit is further configured to open said third on/off valve when the cumulative time that the high pressure valve assembly is activated exceeds said second preset value.

12. The water purifier with a flow meter according to claim 11, wherein the electric control unit is configured to open the third switching valve when it is monitored by the high pressure valve assembly and the flow meter that the water discharge unit is not opened for more than the first preset time.

13. The water purifier with a flow meter according to claim 12, wherein the water outlet assembly includes a drinking water outlet assembly and a domestic water outlet assembly which are independent of each other, the drinking water outlet assembly has the drinking water inlet, the domestic water outlet assembly has the domestic water inlet, and the water outlet includes a drinking water outlet provided in the drinking water outlet assembly and a domestic water outlet provided in the domestic water outlet assembly.

14. The water purifier with a flow meter according to any one of claims 7, 9 or 13, further comprising a pre-filter disposed upstream of the booster pump, the pre-filter having a water discharge amount of not less than 8L/min.

15. The water purifier with a flow meter according to claim 14, wherein a feed valve is provided between the pre-filter element and a point where the flow path upstream of the pre-filter element or the pump inlet is located and the first branch path.

16. The water purifier with a flow meter according to claim 14, further comprising a post-filter element provided on a flow path between the first reverse osmosis filter element and the third check valve.

17. The water purifier with a flow meter according to claim 16, wherein the pre-filter is a PP filter element, an activated carbon filter element, an ultrafiltration filter element, or a nanofiltration filter element; the post-positioned filter element is an activated carbon filter element.

18. The water purifier with a flow meter according to any one of claims 6, 8 or 12, further comprising a pre-filter disposed upstream of the booster pump, the pre-filter having a water yield of less than 8L/min.

19. The water purifier with flow meter according to claim 18, wherein a water inlet valve is provided between the pre-filter element and a point where the flow path upstream of the pre-filter element or the pump inlet is located and the first branch path.

20. The water purifier with a flow meter according to claim 18, further comprising a post-filter element disposed in a flow path between the first reverse osmosis filter element and the third check valve.

21. The water purifier with a flow meter according to claim 20, wherein the pre-filter is a PP filter element, an activated carbon filter element, an ultrafiltration filter element, or a nanofiltration filter element; the post-positioned filter element is an activated carbon filter element.

22. The water purifier with a flow meter according to any one of claims 6 to 13, further comprising a post-filter element provided on a flow path between the first reverse osmosis filter element and the third check valve.