CN114275851A

CN114275851A - Waterway system with double return pipelines and water purifier

Info

Publication number: CN114275851A
Application number: CN202111649767.3A
Authority: CN
Inventors: 宾倩韵; 孙天厚; 谈菲; 刘梦薇
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: 2022-04-05

Abstract

The invention discloses a waterway system with double return pipelines and a water purifier, wherein the waterway system with the double return pipelines returns waste water to a reverse osmosis filter element through a pipeline, and the waste water is mixed with tap water and then enters 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

Waterway system with double return pipelines and water purifier

Technical Field

The invention relates to the technical field of water purifiers, in particular to a waterway system with double return pipelines and a water purifier provided with the waterway system with the double return pipelines.

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 membrane, unwanted substances remain at the end of the solution having a high concentration during this process, while purified pure water is obtained at the end having a low concentration. 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 one end of the purified water through the reverse osmosis membrane. 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 waterway system with double return pipelines and a water purifier, and aims to solve the problem that the waterway system in the existing water purifier generates too much waste water which is not beneficial to resource utilization.

In order to achieve the above object, the present invention provides a waterway system with dual return lines, 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 booster pump is provided with a pump inlet and a pump outlet, the pump inlet is communicated with a water source, the pump outlet is communicated with the first water inlet, and the first wastewater inlet is communicated with one end of a first wastewater direct discharge pipeline;

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;

the first flow limiting valve and the first switch valve are arranged on the first wastewater direct discharge pipeline, and the first flow limiting valve has a flow limiting effect; the first switching valve is located downstream of the first flow restriction valve; a flow path between the first on-off valve and the first flow restriction valve communicates with the pump inlet through a first branch;

the first check valve is arranged on the first branch, and the flow direction of the first check valve flows from the first waste water port to the pump inlet;

the high-voltage switch is arranged on a flow path between the first water outlet and the drinking water inlet;

a flow path between the first reverse osmosis filter element and the high-voltage switch is communicated with the pump inlet through a pure water backflow branch, a second switch valve and a second one-way valve are arranged on the pure water backflow branch, and the flow path of the second one-way valve flows to the pump inlet from the first water outlet;

when the drinking water inlet with when the outlet switches on, high pressure switch is triggered, the booster pump is opened, first ooff valve with the second ooff valve is closed, and when the drinking water inlet with the time that the outlet switches on exceeds first predetermined duration, first ooff valve is opened.

In an embodiment, the drinking water dispenser further comprises a third one-way valve, which is disposed on a flow path between the first water outlet and the high-pressure switch, and the flow direction of the third one-way valve flows from the first water outlet to the drinking water inlet.

In one embodiment, when the domestic water inlet is communicated with the water outlet, the booster pump is powered off, and the first switch valve and the second switch valve are closed.

In one embodiment, when the water outlet assembly is not opened for more than a second preset time period, the first switch valve and the second switch valve are opened.

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 waterway system further includes a second reverse osmosis filter element disposed on the flow path between the first waste water port and the first flow limiting valve, the second reverse osmosis filter element having a second water inlet, a second water outlet and a second waste water port, the second water inlet being communicated with the first waste water port, the second waste water port being communicated with the water inlet end of the first flow limiting valve, the second water outlet being 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 waterway system further comprises a pre-filter element, the pre-filter element is arranged at the upstream of the booster pump, the water outlet side of the first one-way valve is communicated with the pump inlet, and the water outlet amount of the pre-filter element is not less than 8L/min.

In an embodiment, the waterway system further comprises a pre-filter element, the pre-filter element is arranged at the upstream of the booster pump, the water outlet side of the first one-way valve is communicated with the pump inlet, and the water outlet amount of the pre-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 an embodiment, the waterway system further comprises a post-filter element disposed on the 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 also provides a water purifier, which comprises a waterway system with double return pipelines, wherein the waterway system with the double return pipelines comprises:

The invention provides a reverse osmosis system with pure water backflow and wastewater backflow, wherein wastewater flows back to a reverse osmosis filter element through a pipeline, is mixed with tap water and then enters 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.

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 risk of scaling of the membrane is reduced, and the service life of the membrane 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 membrane 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 first embodiment of a waterway system with dual return lines according to the present application;

FIG. 2 is a schematic flow diagram of a waterway system according to a second embodiment of the present application with dual return lines;

FIG. 3 is a schematic flow diagram of a waterway system according to a third embodiment of the present application with dual return lines;

FIG. 4 is a schematic flow diagram of a fourth embodiment of a waterway system according to the present application with dual return lines;

FIG. 5 is a schematic flow diagram of a fifth embodiment of a waterway system according to the present application with dual return lines;

FIG. 6 is a schematic flow diagram illustrating a sixth embodiment of a waterway system according to the present application with dual return lines;

FIG. 7 is a schematic flow diagram illustrating a seventh embodiment of a waterway system according to the present application with dual return lines;

FIG. 8 is a schematic flow diagram illustrating an eighth embodiment of a waterway system according to the present application with dual return lines;

FIG. 9 is a schematic flow diagram illustrating a ninth embodiment of a waterway system according to the present application with dual return lines;

FIG. 10 is a schematic flow diagram illustrating a tenth embodiment of a waterway system according to the present application with dual return lines;

FIG. 11 is a schematic flow diagram illustrating an eleventh embodiment of a waterway system according to the present application with dual return lines;

FIG. 12 is a schematic flow diagram illustrating a twelfth embodiment of a waterway system according to the present application with dual return lines;

FIG. 13 is a schematic flow diagram illustrating a thirteenth embodiment of a waterway system according to the present application with dual return lines;

FIG. 14 is a schematic flow diagram illustrating a fourteenth embodiment of a waterway system according to the present application with dual return lines;

FIG. 15 is a schematic flow diagram illustrating a fifteenth embodiment of a waterway system according to the present application with dual return lines;

FIG. 16 is a schematic flow diagram illustrating a sixteenth embodiment of a waterway system according to the present application with dual return lines;

FIG. 17 is a schematic flow diagram illustrating a seventeenth embodiment of a waterway system according to the present application having dual return lines;

FIG. 18 is a schematic flow diagram illustrating an eighteenth embodiment of a waterway system according to the present application with dual return lines;

FIG. 19 is a schematic flow diagram illustrating a nineteenth embodiment of a waterway system according to the present application with dual return lines;

FIG. 20 is a schematic flow diagram illustrating a twentieth embodiment of a waterway system according to the present application with dual return lines;

FIG. 21 is a schematic flow diagram illustrating a twenty-first embodiment of a waterway system according to the present application with dual return lines;

FIG. 22 is a schematic flow diagram illustrating a twenty-second embodiment of a waterway system according to the present application with dual return lines;

FIG. 23 is a schematic flow diagram illustrating a twenty-third embodiment of a waterway system according to the present application with dual return lines;

FIG. 24 is a schematic flow diagram illustrating a twenty-fourth embodiment of a waterway system according to the present application with dual return lines.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				11a	First reverse osmosis filter element	111	First water inlet
112	The first water outlet	113	First waste water port
				11b	Second reverse osmosis filter element	114	Second water inlet
115	Second water outlet	116	Second waste water port
				12	Booster pump	121	Pump inlet
122	Pump outlet	P₁	First branch
				P₂	Second branch	Q₁	First wastewater direct discharge pipeline
Q₂	Second wastewater direct discharge pipeline	14a	First flow limiting valve
				14b	Second flow limiting valve	18a	First switch valve
18b	Second switch valve	18c	Third on-off valve
				15a	First check valve	15b	Second check valve
15c	Third check valve	15d	Fourth check valve
				16	High-voltage switch	13	Water outlet assembly
131	Drinking water inlet	132	Water inlet for domestic water
				133	Water outlet	13a	Drinking water outlet assembly
13b	Domestic water outlet assembly	131a	Drinking water outlet
				131b	Domestic water outlet	17a	Front filter element
17b	Rear filter element	R	Pure water return branch

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 invention provides a waterway system with double return pipelines and a water purifier provided with the waterway system with the double return pipelines.

This waterway system with two return lines includes: the water purifier comprises a first reverse osmosis filter element 11a, a booster pump 12, 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 and a high-pressure switch 16. The first reverse osmosis cartridge 11a has a first water inlet 111, a first water outlet 112 and a first waste water outlet 113. The booster pump 12 has a pump inlet 121 and a pump outlet 122, the pump inlet 121 is used for communicating with a water source, the pump outlet 122 is communicated with the first water inlet 111, the first waste water outlet 113 is communicated with the first waste water direct discharging pipeline Q₁One end of which is communicated. The water outlet assembly 13 has 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. A first flow limiting valve 14a and a first switch valve 18a, both disposed on the first wastewater straight discharge pipeline Q₁The first flow restriction valve 14a has a flow restricting function (in-restriction)In a flow state, the flow rate is small, and can be 5% -80% in a fully open state, and preferably, the flow rate can be 10% -30% in the fully open state); the first switching valve 18a is located downstream of the first flow restriction valve 14 a; the flow path between the first opening/closing valve 18a and the first flow restriction valve 14a passes through a first branch passage P₁Communicates with the pump inlet 121; the first check valve 15a is disposed in the first branch P₁The first check valve 15a flows from the first waste water port 113 to the pump inlet 121. The high-pressure switch 16 is provided in a flow path between the first water outlet 112 and the drinking water inlet 131.

The flow path between the first reverse osmosis filter element 11a and the high-voltage switch 16 is communicated with the pump inlet 121 through a pure water return branch R, the pure water return branch R is provided with a second switch valve 18b and a second one-way valve 15b, and the flow path of the second one-way valve 15b flows from the first water outlet 112 to the pump inlet 121.

When the drinking water inlet 131 and the water outlet 133 are conducted, the high pressure switch 16 is triggered, the booster pump 12 is turned on, the first and

second switching valves

18a and 18b are closed, and when the drinking water inlet 131 and the water outlet 133 are conducted for more than a first preset time period (preferably 1-5min), the first switching valve 18a is opened.

The invention provides a reverse osmosis high-water-saving pure water backflow system connected with a tap. 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 the return pipeline, the system also connects the wastewater of the first reverse osmosis filter element 11a with the existing kitchen faucet of a user home, not only can the utilization rate of the space be improved, the cost is reduced, the first reverse osmosis filter element 11a and the wastewater return pipeline can be washed by opening the household faucet (the household water inlet 132 is communicated with the household water outlet 131 b) through 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 environment 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. This system has pure water backward flow branch road R simultaneously for with the water purification backward flow to first reverse osmosis filter core 11a front end, wash and the preceding raw water of first reverse osmosis filter core 11a of neutralization, there is not residual old water, first glass of water just can drink, and water quality is stable, provides pure fresh running water 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 first water outlet 112 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 and is used for enabling pure water to flow back to the front end of the first reverse osmosis filter element 11 a; the wastewater outlet side 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, the other path is a wastewater return line, wastewater can flow back to the front of the booster pump 12 through the first flow limiting valve 14a, and a branch is a first wastewater direct discharge line Q on the wastewater return line₁And 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 existence of the one-way valve, when the drinking water tap is closed, water is limited between the one-way valve 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 (life level inlet and outlet 133 open): 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 side 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 a living water tap (a living level water inlet is communicated with the water outlet 133), 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, the design is that after the drinking water taking time of the user reaches a certain value (the first preset time is preferably 1-5min), a waste water direct discharging program is started (the time is preferably 5-300s), and at the moment, the waste water is discharged while water is taken; the booster pump 12 is kept started, namely, the normal water making 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 to 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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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 flows back through the pure water return branchThe way R returns to the booster pump 12 and then is mixed with tap water to enter 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 side and is directly discharged into a first wastewater straight-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 and live 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 (life level water inlet switches on with outlet 133) and can accomplish 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 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 cup of water and incrustation scale deposit and influences life's problem.

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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; when 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 returns to the booster pump 12 through the pure water return branch R, is 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 flushed and neutralized;the wastewater flows out from the wastewater side and is directly discharged into a first wastewater straight-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 and live 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 (life level water inlet switches on with outlet 133) and can accomplish 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 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 cup of water and incrustation scale deposit and influences life's problem.

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.

The user turns on the life tap (life level inlet and outlet 133 open): 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 side of the first reverse osmosis filter element 11a in two ways, one way is high in flow rate and is directly discharged through a domestic water faucet, and the other way flows back to the booster pump 12 through the first flow limiting valve 14a (flow limiting and low in flow rate) and then enters the first reverse osmosis filter element 11a again to flush the waste water side of the first reverse osmosis filter element 11a after being mixed with the tap water. Namely, when a user opens a living water tap (a living level water inlet is communicated with the water outlet 133), 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.

Pure water reflux procedure: when the situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; the booster pump 12 is started, the first switch valve 18a is opened, the second switch valve 18b is opened, after tap water enters the first reverse osmosis filter element 11a, pure water passes through the post-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 side and is directly discharged into a first wastewater straight-discharge pipeline Q₁(ii) a The procedure can accomplish the placement of the original residual water in the first reverse osmosis filter element 11a, the post filter element 17b and the wastewater pipelineThe problem of first cup water and old water is solved, the water quality is stable, and pure fresh water is provided 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 (life level water inlet switches on with outlet 133) and can accomplish 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 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 cup of water and incrustation scale deposit and influences life's problem.

Example four: please refer to 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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; the booster pump 12 is started, the first switch valve 18a is opened, the second switch valve 18b is opened, after tap water enters the first reverse osmosis filter element 11a, pure water passes through the post-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 side and is directly discharged into a first wastewater straight-discharge pipeline Q₁(ii) a TheThe 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 (life level water inlet switches on with outlet 133) and can accomplish 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 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 cup 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 (life level inlet and outlet 133 open): tap water enters the first reverse osmosis filter element 11a through the booster pump 12 and then flows out of the wastewater side of the first reverse osmosis filter element 11a, enters the second reverse osmosis filter element 11b and then flows out of the wastewater side 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 wastewater sides of the two reverse osmosis filter elements; namely, when a user opens a living water tap (a living water inlet and a water outlet 133 are communicated), 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 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 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, the design is that after the drinking water taking time of the user reaches a certain value (the first preset time is preferably 1-5min), a waste water direct discharging program is started (the time is preferably 5-300s), and at the moment, the waste water is discharged while water is taken; the booster pump 12 is kept started, namely, the normal water making 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 to the pipeline Q along with the first wastewater₁Discharge, discharge water TDS is shortThe initial level can be recovered within a period of time, and the influence on the flow of drinking water is weak.

Pure water reflux procedure: when the situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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 washes and neutralizes 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 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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 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.

Direct discharge procedure of wastewater: when the user takes the drinking waterBecause the waste water flows back, the TDS of the outlet water is increased along with the increase of the water taking time, therefore, the design is that when the drinking water taking time of a user reaches a certain value (the first preset time is preferably 1-5min), a waste water direct discharging program is started (the time is preferably 5-300s), and at the moment, the waste water is taken and discharged at the same time; the booster pump 12 is kept started, namely, the normal water making 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 to 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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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, 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 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 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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 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.

The user turns on the life tap (life level inlet and outlet 133 open): tap water enters the first reverse osmosis filter element 11a through the booster pump 12 and then flows out of the wastewater side of the first reverse osmosis filter element 11a, enters the second reverse osmosis filter element 11b and then flows out of the wastewater side 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 wastewater sides of the two reverse osmosis filter elements; namely, when a user opens a living water tap (a living water inlet and a water outlet 133 are communicated), 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, the domestic water can flush out pollutants such as scale, organic matters and the like deposited on the side surfaces of the two reverse osmosis filter elements and the wastewater, reduce the scaling risk of the two reverse osmosis filter elements and prolong the service lives of the two reverse osmosis filter elements; 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.

Pure water reflux procedure: when the situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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; 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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 eight: please refer to fig. 8. In the embodiment, on the basis of the fifth 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 the second reverse osmosis filter element 11b and in front of a pure water reflux 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 roughly filtered by the front filter element 17a and then flows into the first reverse osmosis filter element 11a, then 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 by a drinking water faucet for drinking after passing through the rear filter element 17b, 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 front 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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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, pure water and waste water are separated into one path, the pure water flows to the third one-way valve 15c, and the waste water flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration, and then the pure water is separated into one pathAnd a path of wastewater, wherein pure water flows to the third one-way valve 15c, joins with water flow from the first water outlet 112, flows into the rear filter element 17b, 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 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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 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 (life level inlet and outlet 133 open): 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 two paths of filter element wastewater sides, one path of the tap water is converged with a large flow rate and then 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 the flow is small), 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 two reverse osmosis filter element wastewater sides; namely, when a user opens a living water tap (a living water inlet and a water outlet 133 are communicated), 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 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 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, the design is that after the drinking water taking time of the user reaches a certain value (the first preset time is preferably 1-5min), a waste water direct discharging program is started (the time is preferably 5-300s), and at the moment, the waste water is discharged while water is taken; the booster pump 12 keeps starting, keeps normal system water state promptly, and first ooff valve 18a and third ooff valve 18c open, and the waste water that two reverse osmosis filter core produced is discharged along with two waste water straight discharge pipelines, and initial level can be resumeed in the play water TDS short time, and is less to the drinking water flux influence.

Pure water reflux procedure: when the situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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 filter elements is directly discharged into two waste water direct discharge pipelines; 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 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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.

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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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 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; 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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 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. A mechanical drinking water faucet is added into the wastewater backflow system, the pure water outlet side 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 a pipeline, and the other path is a pure water backflow branch R and is used for enabling the pure water to flow back to the front end of the first reverse osmosis filter element 11 a; the waste water outlet side 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 house, the other path is a waste water return line, waste water can flow back to the front of the booster pump 12 through the first flow limiting valve 14a, and a branch is a first waste water direct discharge line Q on the waste water return line₁And 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 life tap (the life water inlet 132 is communicated with the life water outlet 131 b): 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 side 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; that is, when the user opens the living water faucet (the living water inlet 132 is communicated with the living water outlet 131 b), the tap water with lower ion concentration can replace the waste water with high ion concentration accumulated on the waste water side of the first reverse osmosis filter element 11a, thereby effectively solving the problem of the first cup of water. 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 for a long time (the second preset time is preferred)10min-10h) when the water purifier is not used, starting a pure water reflux program (the time is preferably 5-300s), and refluxing the pure water and discharging the wastewater at the moment; when 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 returns to the booster pump 12 through the pure water return branch R, is 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 flushed and neutralized; the wastewater flows out from the wastewater side and is directly discharged into a first wastewater straight-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 (life level water inlet switches on with outlet 133) and can accomplish 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 took the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and return line for a long time, causes first cup 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 first 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 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 the 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 for a long time (the second preset time is preferably 10 min-1)0h) When the water purifier is not used, starting a pure water reflux program (the time is preferably 5-300s), and refluxing the pure water and discharging the waste water; when 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 returns to the booster pump 12 through the pure water return branch R, is 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 flushed and neutralized; the wastewater flows out from the wastewater side and is directly discharged into a first wastewater straight-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 (life level water inlet switches on with outlet 133) and can accomplish 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 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 cup of water and incrustation scale deposit and influences life's problem.

Example fifteen: please refer to fig. 15. 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 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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; the booster pump 12 is started, the first switching valve 18a and the second switching valve 18b are opened, and the tap waterAfter water enters the first reverse osmosis filter element 11a, pure water passes through the post-filter element 17b, returns to the booster pump 12 through the pure water backflow branch R, is mixed with tap water, enters the first reverse osmosis filter element 11a again, and washes and neutralizes raw water in front of the first reverse osmosis filter element 11 a; the wastewater flows out from the wastewater side and is directly discharged into a first wastewater straight-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 (life level water inlet switches on with outlet 133) and can accomplish 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 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 cup 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 first 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 reflux branch; 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 length is monitoredWhen the water purifier is not used for a second preset time (preferably 10min-10h), starting a pure water reflux program (preferably 5-300s), and at the moment, refluxing the pure water and discharging the wastewater; 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 side and is directly discharged into a first wastewater straight-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 (life level water inlet switches on with outlet 133) and can accomplish 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 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 cup of water and incrustation scale deposit and influences life's problem.

Example seventeen: please refer to fig. 17. 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 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 life tap (the life water inlet 132 is communicated with the life water outlet 131 b): tap water enters the first reverse osmosis filter element 11a through the booster pump 12, flows out of the wastewater side of the first reverse osmosis filter element 11a and enters the second reverse osmosis filter element 11b, then flows out of the wastewater side of the second reverse osmosis filter element 11b in two paths, one path of the wastewater flows out directly through a tap water faucet, and the other path of the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a (with flow limitation and small flow), is mixed with 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; 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 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 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, the design is that after the drinking water taking time of the user reaches a certain value (the first preset time is preferably 1-5min), a waste water direct discharging program is started (the time is preferably 5-300s), and at the moment, the waste water is discharged while water is taken; the booster pump 12 is kept started, namely, the normal water making state is kept, the first switch valve 18a is opened, and the waste water generated by the two reverse osmosis filter elements 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.

Pure water reflux procedure: when the situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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 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 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. Normally, the user turns onThe domestic faucet (the domestic level water inlet is switched on with outlet 133) 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 after the user 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 eighteen: please refer to fig. 18. In the embodiment, on the basis of the fifth 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 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 the 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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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 merged pure water is returned through pure waterThe flow branch R is mixed with tap water before returning to the booster pump 12 and then enters 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 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 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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 nineteenth: please refer to fig. 19. 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

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 use the water purifier for a long time (the second preset time is preferably 10min-10h), starting a pure water backflow program (the time is preferably 5-300s), and returning to the water purifier at the momentFlowing pure water and discharging waste water; 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 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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 the embodiment, on the basis of the fifth 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 the second reverse osmosis filter element 11b and in front of a 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 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 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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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 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 normal conditions, the user opens life tap (the standard of living water inlet switches on with outlet 133) and can accomplish washing to two reverse osmosis filter core 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 core and waste water return line for a long time, causes first cupWater and scale deposit to affect the service life.

Example twenty one: please refer to fig. 21. 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 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 life tap (the life water inlet 132 is communicated with the life water outlet 131 b): 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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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 two: please refer to fig. 22. In this embodiment, on the basis of the ninth embodiment, a large-flux pre-filter element 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 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 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 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 situation that the user does not use the water purifier for a long time (the second preset time is preferably 10min-10h) is monitored, starting a pure water backflow program (the time is preferably 5-300s), and at the moment, both the pure water backflow and the wastewater discharge are carried out; 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, 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 (life level water inlet and outlet 133 switch on) can accomplish two reverse osmosis filter cores and the washing of 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 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 the ninth embodiment, a large-flux preposed filter element 17a is added at the front end of the booster pump 12, and a postpositive 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 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 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 fully opened or openedValve body with full-closed 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 waterway system with dual return lines, comprising:

2. The waterway system of claim 1, further comprising a third check valve disposed in the flow path between the first outlet and the high pressure switch, wherein the third check valve flows from the first outlet to the drinking water inlet.

3. The waterway system of claim 2, wherein when the sanitary water inlet is communicated with the drain port, the booster pump is de-energized and the first and second switch valves are closed.

4. The waterway system of claim 3, wherein the first and second switch valves are opened when the outlet assembly is not open for more than a second predetermined time period.

5. The waterway system of claim 4, wherein the outlet assembly comprises a drinking water outlet assembly and a domestic water outlet assembly, the drinking water outlet assembly having the drinking water inlet, the domestic water outlet assembly having the domestic water inlet, the water outlet comprising a drinking water outlet disposed at the drinking water outlet assembly and a domestic water outlet disposed at the domestic water outlet assembly.

6. The waterway system of claim 4, further comprising a second reverse osmosis filter element disposed in the flow path between the first waste water port and the first constrictor valve, the second reverse osmosis filter element having a second water inlet in communication with the first waste water port, a second water outlet in communication with the water inlet of the first constrictor valve, and a second waste water port in communication with the flow path between the first water outlet and the third one-way valve.

7. The waterway system of any one of claims 6, wherein the 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 having the drinking water inlet, the domestic water outlet assembly having the domestic water inlet, and the water outlet comprising a drinking water outlet disposed at the drinking water outlet assembly and a domestic water outlet disposed at the domestic water outlet assembly.

8. The waterway system with two return lines of claim 4, further comprising a second reverse osmosis filter element having a second water inlet, a second water outlet and a second waste water outlet, wherein 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 straight discharge line, a second flow limiting valve and a third on-off valve are arranged on the second waste water straight discharge line, 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.

9. The waterway system of claim 8, wherein the outlet assembly comprises a drinking water outlet assembly and a domestic water outlet assembly, the drinking water outlet assembly having the drinking water inlet, the domestic water outlet assembly having the domestic water inlet, the water outlet comprising a drinking water outlet disposed at the drinking water outlet assembly and a domestic water outlet disposed at the domestic water outlet assembly.

10. The waterway system with the double return lines of any one of claims 5, 7 or 9, further comprising a pre-filter element disposed upstream of the booster pump, wherein the water outlet side of the first check valve is communicated with the pump inlet, and the water outlet amount of the pre-filter element is not less than 8L/min.

11. The waterway system of claim 10, wherein a fill valve is disposed between the pre-filter element and a location upstream of the pre-filter element or where the pump inlet is located at the intersection of the first branch and the waterway.

12. The waterway system of claim 10, further comprising a post-filter element disposed in the flow path between the first reverse osmosis filter element and the third one-way valve.

13. The waterway system with dual return lines of claim 12, 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.

14. The waterway system with dual return lines of any one of claims 1, 6 or 8, further comprising a pre-filter disposed upstream of the booster pump, wherein the water outlet side of the first one-way valve is in communication with the pump inlet, and wherein the water outlet amount of the pre-filter is less than 8L/min.

15. The waterway system of claim 14, wherein a fill valve is disposed between the pre-filter element and a location upstream of the pre-filter element or where the pump inlet is located at the intersection of the flowpath and the first branch.

16. The waterway system of claim 14, further comprising a post-filter element disposed in the flow path between the first reverse osmosis filter element and the third one-way valve.

17. The waterway system of claim 16, wherein the pre-filter is a PP filter, an activated carbon filter, an ultrafiltration filter or a nanofiltration filter; the post-positioned filter element is an activated carbon filter element.

18. The waterway system of any one of claims 4-9, further comprising a post-filter element disposed in the flow path between the first reverse osmosis filter element and the third one-way valve.

19. A water purifier comprising a waterway system with dual return lines according to any one of claims 1 to 18.