CN114275846A

CN114275846A - Waterway system with wastewater direct discharge and pure water reflux and water purifier

Info

Publication number: CN114275846A
Application number: CN202111645382.XA
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
Anticipated expiration: 2041-12-29
Also published as: CN114275846B

Abstract

The invention discloses a waterway system with direct wastewater discharge and pure water backflow and a water purifier, wherein the waterway system enables wastewater to flow back to a reverse osmosis filter element through a pipeline, and the wastewater 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 wastewater direct discharge and pure water reflux and water purifier

Technical Field

The invention relates to the technical field of water purifiers, in particular to a waterway system with direct wastewater discharge and pure water backflow and a water purifier provided with the waterway system with the direct wastewater discharge and the pure water backflow.

Background

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

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

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

Disclosure of Invention

The invention mainly aims to provide a waterway system with direct wastewater discharge and pure water backflow and a water purifier, and aims to solve the problem that the excessive wastewater generated by the waterway system in the existing water purifier is not beneficial to resource utilization.

In order to achieve the above object, the present invention provides a waterway system with direct discharge of wastewater and return of pure water, comprising:

the water purifier comprises a first reverse osmosis filter element and a booster pump, wherein a pump inlet of the booster pump is communicated with a water source, a pump outlet of the booster pump is communicated with a first water inlet of the first reverse osmosis filter element, and a first wastewater inlet of the first reverse osmosis filter element is communicated with one end of a first wastewater direct discharge pipeline;

the water outlet assembly comprises a drinking water outlet assembly and a domestic water outlet assembly which are independent of each other, the drinking water outlet assembly is provided with a drinking water inlet and a drinking water outlet, the domestic water outlet assembly is provided with a domestic water inlet and a domestic water outlet, 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 waste water straight-discharging pipeline, the first flow limiting valve has a flow limiting state and a full-open state, and the first switch valve is positioned at the downstream of the first flow limiting valve; a flow path between the first switch valve and the first flow limiting valve is communicated with the pump inlet through a first branch path, and a first one-way valve which flows towards the pump inlet is arranged on the first branch path;

the first high-pressure switch and the second high-pressure switch are respectively and correspondingly arranged on a flow path between the first water outlet and the drinking water inlet and a flow path between the first waste water inlet and the domestic water inlet;

a flow path between the first water outlet and the drinking water inlet 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 direction of the second one-way valve flows from the first water outlet to the pump inlet;

when the drinking water inlet is communicated with the drinking water outlet, the first high-pressure switch is triggered, the booster pump is started, the first switch valve is closed, and the first flow limiting valve is in a flow limiting state; when the accumulated conduction time of the drinking water inlet and the drinking water outlet exceeds a first preset value, the first switch valve is opened;

when the domestic water inlet is communicated with the domestic water outlet, the first flow limiting valve is opened in a full-open state, and the first switch valve is closed.

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

In an embodiment, a third check valve is disposed on a flow path between the first water outlet and the first high-pressure switch, and a fourth check valve is disposed on a flow path between the first waste water outlet and the second high-pressure switch.

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 state and a full-open state; 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 fifth one-way valve is arranged on the second branch, and the flow direction of the fifth one-way valve flows from the second waste water port to the pump inlet;

when the drinking water inlet is communicated with the drinking water outlet, the first high-pressure switch is triggered, and the third switch valve is closed;

when the domestic water inlet is communicated with the domestic water outlet, the second flow limiting valve is opened in a fully open state, and the third switch valve is closed.

In one embodiment, when the time when the water outlet assembly is not continuously opened exceeds a second preset value, the third on/off valve is opened.

In one embodiment, the waterway system further comprises a pre-filter element disposed upstream of the booster pump.

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 water yield of the preposed filter element is not less than 8L/min.

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 direct wastewater discharge and pure water backflow, wherein the waterway system with direct wastewater discharge and pure water backflow comprises:

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

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

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

Drawings

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

FIG. 1 is a schematic flow diagram of a first embodiment of the present application of a waterway system with in-line waste water and pure water return;

FIG. 2 is a schematic flow diagram of a second embodiment of the waterway system with direct discharge of wastewater and return of pure water according to the present application;

FIG. 3 is a schematic flow diagram of a third embodiment of the waterway system with direct discharge of wastewater and return of pure water according to the present application;

FIG. 4 is a schematic flow diagram of a fourth embodiment of the waterway system with direct discharge of wastewater and return of pure water according to the present application;

FIG. 5 is a schematic flow diagram of a fifth embodiment of the present application of a waterway system with direct discharge of wastewater and return of pure water;

FIG. 6 is a schematic flow diagram of a sixth embodiment of the present application of a waterway system with direct discharge of wastewater and return of pure water;

FIG. 7 is a schematic flow diagram of a seventh embodiment of the present application of a waterway system with direct discharge of wastewater and return of pure water;

FIG. 8 is a schematic flow diagram of an eighth embodiment of the present application of a waterway system with direct discharge of wastewater and return of pure water;

FIG. 9 is a schematic flow diagram of a ninth embodiment of the present application of the waterway system with direct discharge of wastewater and return of pure water;

FIG. 10 is a schematic flow diagram of a tenth embodiment of the present application of a waterway system with direct discharge of wastewater and return of pure water;

FIG. 11 is a schematic flow diagram of an eleventh embodiment of the waterway system of the present application with in-line waste water discharge and pure water return;

FIG. 12 is a schematic flow diagram of a twelfth embodiment of the waterway system with direct discharge of wastewater and return of pure water according to the present application.

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
				15e	Fifth check valve	16a	A first high voltage switch
16b	Second high-voltage switch	13	Water outlet assembly
				131	Drinking water inlet	132	Water inlet for domestic water
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 direct wastewater discharge and pure water backflow and a water purifier provided with the waterway system with the direct wastewater discharge and the pure water backflow.

This waterway system with direct discharging of waste water and pure water reflux 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, a first high-pressure switch 16a and a second high-pressure switch 16 b. A pump inlet 121 of the booster pump 12 is used for being communicated with a water source, a pump outlet 122 of the booster pump 12 is communicated with a first water inlet 111 of the first reverse osmosis filter element 11a, and a first waste water inlet 113 of the first reverse osmosis filter element 11a is communicated with one end of a first waste water direct discharge pipeline Q1; the water outlet assembly 13 comprises a drinking water outlet assembly 13 and a domestic water outlet assembly 13b which are independent of each other, the drinking water outlet assembly 13 is provided with a drinking water inlet 131 and a drinking water outlet 131a, the domestic water outlet assembly 13b is provided with a domestic water inlet 132 and a domestic water outlet 131b, 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 outlet 113; a first flow limiting valve 14a and a first on-off valve 18a are provided on the first wastewater straight discharge line Q1, the first flow limiting valve 14a has a flow limiting state (in the flow limiting state, the flow rate is small, and may be 5% to 80% in a fully open state, and more preferably, the flow rate may be 10% to 30% in the fully open state) and a fully open state, and the first on-off valve 18a is located downstream of the first flow limiting valve 14 a; the flow path between the first switching valve 18a and the first flow restriction valve 14a communicates with the pump inlet 121 through a first branch P1, and a first check valve 15a that flows toward the pump inlet 121 is provided in the first branch P1; the first high-pressure switch 16a and the second high-pressure switch 16b are respectively and correspondingly arranged on a flow path between the first water outlet 112 and the drinking water inlet 131 and a flow path between the first waste water inlet 113 and the domestic water inlet 132; the flow path between the first water outlet 112 and the drinking water inlet 131 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 on-off valve 18b and a second check valve 15b, and the flow direction of the second check valve 15b flows from the first water outlet 112 to the pump inlet 121.

When the drinking water inlet 131 is communicated with the drinking water outlet 131a, the first high-pressure switch 16a is triggered, the booster pump 12 is started, the first switch valve 18a is closed, and the first flow limiting valve 14a is in a flow limiting state; and when the accumulated conduction time of the drinking water inlet 131 and the drinking water outlet 131a exceeds a first preset value (preferably 1-5min), the first switch valve 18a is opened; when the domestic water inlet 132 and the domestic water outlet 131b are communicated, the first flow restriction valve 14a is opened in a fully open state, and the first on-off valve 18a is closed.

The invention provides a reverse osmosis high-recovery pure water backflow system connected with a tap water faucet. And the wastewater generated by the first reverse osmosis filter element 11a in the water purification process flows back to the front of the first reverse osmosis filter element 11a through a pipeline, is mixed with tap water and then enters the first reverse osmosis filter element 11a again for secondary filtration. Besides the wastewater generated by the first reverse osmosis filter element 11a flows back to the front of the first reverse osmosis filter element 11a through a return line, the system 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 flushing of the first reverse osmosis filter element 11a and the wastewater return line can be completed by opening the tap water faucet 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 environmental protection are met. In addition, a first wastewater direct discharge pipeline Q is also arranged₁And can be used for directly discharging waste water when necessary. 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 drinking water faucet is added into the wastewater backflow system, the pure water outlet end of the first reverse osmosis filter element 11a is divided into two paths, one path is directly connected with the drinking water faucet, a third one-way valve 15c and a first high-pressure switch 16a are sequentially added on the pipeline, and the other path is a pure water backflow branch R for backflow of pure water to the front end of the first reverse osmosis filter element 11 a; the waste water outlet end of the first reverse osmosis filter element 11a is divided into two paths, one path is directly connected with the existing kitchen faucet of a user home, and a fourth one-way valve 15d and a second high-pressure switch 16b are sequentially arranged on a pipeline; the other path is a waste water return pipeline, waste water can flow back to the front of the booster pump 12 through a first flow limiting valve 14a, and a branch of the waste water return pipeline is a first waste water direct discharge pipeline Q₁And if necessary, the method is used for directly discharging the wastewater. The first flow limiting valve 14a on the waste water return pipeline is a valve body with a flow limiting function; first wastewater straight-line pipeline Q₁First on-off valve 18a andthe second on-off valve 18b in the pure water return branch R is a valve body having a fully-on or fully-off function. The third non return valve 15c, in combination with the first high pressure switch 16a, 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 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; after tap water flows into the first reverse osmosis filter element 11a, the tap water is divided into a path of pure water and a path of wastewater, the pure water is discharged by a drinking water faucet for drinking, the wastewater is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and then enters the first reverse osmosis filter element 11a again for filtration, and zero discharge of the wastewater is realized.

The user turns on the tap (the domestic water inlet 132 is communicated with the domestic water outlet 131 b): the second high-pressure switch 16b detects the pressure change, and opens the first flow-limiting valve 14 a; at the moment, the first reverse osmosis filter element 11a does not produce pure water, tap water enters the first reverse osmosis filter element 11a through the booster pump 12 (the pump is not started), then flows out of the first waste water outlet 113 in two ways, one way of tap water is mixed with tap water and then passes through the first reverse osmosis filter element 11a again before flowing back to the booster pump 12 through the first flow limiting valve 14a, and the first reverse osmosis filter element 14a is opened and has a large flow, so that a waste water return water path and the first flow limiting valve 14a can be flushed, 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 prolonged; the other path is directly discharged through a tap water faucet for domestic water, and part of the original waste water remained in the system is discharged through the tap water faucet. Namely, when a user opens the tap water faucet, the flushing program of the system is started, 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 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 backflow waterway and the first flow limiting valve 14a, the risk that the first flow limiting valve 14a is blocked 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.

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 when the drinking water taking time of the user reaches a certain value (the first preset value 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 value is preferably 10min-10h) is monitored, a pure water backflow procedure is started (the time is preferably 5-300s), and at the moment, the pure water is refluxed and the waste water is discharged; 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 end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The procedure can complete the replacement of original residual old water in the first reverse osmosis filter element 11a and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under normal conditions, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids not having to use life water again after the user has got the drinking waterAnd the residual water is required to be retained in the first reverse osmosis filter element 11a and the wastewater return pipeline for a long time, so that the problem that the first cup of water and scale deposit to influence the service life is caused.

Example two: please refer to fig. 2. 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start 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 situation that the user does not use the water purifier for a long time (the second preset value is preferably 10min-10h) is monitored, a pure water backflow procedure is started (the time is preferably 5-300s), and at the moment, the pure water is refluxed and the waste water is discharged; 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 end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The procedure can complete the replacement of original residual old water in the first reverse osmosis filter element 11a and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; while preventing the first reverse osmosis filter element 11a and the first flow limiting valve14a, extending the life of the first reverse osmosis cartridge 11a and the first flow restriction valve 14 a. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example three: please refer to fig. 3. In this embodiment, on the basis of the first embodiment, a post-filter 17b is added on the pure water outlet pipe of the first reverse osmosis filter 11a 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 drinking water outlet 131 a): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start 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 value is preferably 10min-10h) is monitored, a pure water backflow procedure is started (the time is preferably 5-300s), and at the moment, the pure water is refluxed and the waste water is discharged; the booster pump 12 is started, the first switch valve 18a and the second switch valve 18b are opened, after tap water enters the first reverse osmosis filter element 11a, pure water passes through the post-positioned filter element 17b, and then returns to the booster pump 12 through the pure water backflow branch R to be mixed with the tap water and then enters the first reverse osmosis filter element 11a again, and raw water in front of the first reverse osmosis filter element 11a is washed and neutralized; the wastewater flows out from the wastewater end and is directly discharged into a first wastewater direct discharge pipeline Q₁(ii) a The procedure can accomplish the replacement of the original residual water in the first reverse osmosis filter element 11a, the post filter element 17b and the waste water pipelineThe problem of first cup of 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 and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example four: please refer to fig. 4. 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 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; tap water is roughly filtered by the large-flux preposed filter element 17a and flows into the first reverse osmosis filter element 11a, then is divided into a path of pure water and a path of wastewater, the pure water is discharged by a drinking water faucet for drinking after passing through the postposition filter element 17b, and the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and is mixed with the water discharged by the large-flux preposed filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, so that zero discharge of the wastewater is realized.

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

Example five: please refer to fig. 5. In the 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 the water inlet end of the first flow limiting valve 14a, and the second water outlet 115 is communicated with the flow path between the first water outlet 112 and the third one-way valve 15 c; the wastewater outlet of the first reverse osmosis filter element 11a is connected with the water inlet of the second reverse osmosis filter element 11b, the second reverse osmosis filter element 11b carries out secondary filtration on the wastewater of 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 then 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; after tap water flows into 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, the waste water flows into the second reverse osmosis filter element 11b, after secondary filtration, the pure water and the water flow from the first water outlet 112 are combined and flow to the third one-way valve 15c, the 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 then enters the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the waste water is realized.

The user turns on the tap (the domestic water inlet 132 is communicated with the domestic water outlet 131 b): the second high-pressure switch 16b detects the pressure change, and opens the first flow-limiting valve 14 a; at the moment, the two reverse osmosis filter elements do not generate pure water, tap water enters the first reverse osmosis filter element 11a through the booster pump 12 (the pump is not started), flows out from the waste water end of the first reverse osmosis filter element 11a, enters the second reverse osmosis filter element 11b, flows out from the waste water end of the second reverse osmosis filter element 11b in two paths, and flows back to the booster pump 12 through the first flow limiting valve 14a in one path, is mixed with the tap water and then enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11 b; because the first flow limiting valve 14a is in an open state, the flow rate is high, a wastewater backflow waterway and the first flow limiting valve 14a can be flushed, 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 cores are prolonged; the other path is directly discharged through a tap water faucet for domestic water, and part of the original waste water remained in the system is discharged through the tap water faucet. Namely, when a user opens a tap water faucet, a flushing program of the system is started, tap water with lower ion concentration can replace waste water with high ion concentration accumulated at the waste water side of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, and 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 backflow waterway and the first flow limiting valve 14a, the risk that the first flow limiting valve 14a is blocked 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 for domestic water, 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 value is preferably 10min-10h) is monitored, a pure water backflow procedure is started (the time is preferably 5-300s), and at the moment, the pure water is refluxed and the waste water is discharged; 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 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, is subjected to secondary filtration, and then is divided into a path of pure water and a path of wastewater, and the pure water and the water flow from the first water outlet 112 are merged and flow to the third one-way valve 15 c; the converged pure water returns to the booster pump 12 through the pure water return branch R, is mixed with tap water and then enters the two reverse osmosis filter elements again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out from the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the two reverse osmosis filter elements 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 the life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids finishing getting when the userThe drinking water does not need to use domestic water, so that the residual water is retained in the two reverse osmosis filter elements and the wastewater return pipeline for a long time, and the problem that the first cup of water and scale deposit to influence the service life is caused.

Example six: please refer to fig. 6. 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start 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 and water flow from the first water outlet 112 are merged and flow to the third one-way valve 15c, the 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 large-flux preposed filter element 17a, and the mixed water enters 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 value is preferably 10min-10h) is monitored, a pure water backflow procedure is started (the time is preferably 5-300s), and at the moment, the pure water is refluxed and the waste water is discharged; 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, then the tap water is divided into a path of pure water and a path of wastewater, the pure water flows to the third one-way valve 15c, and the wastewater flows into the second reverse osmosisAfter the second filtration, the permeable filter element 11b divides into a path of pure water and a path of wastewater, and the pure water and the water flow from the first water outlet 112 are merged and flow to the third one-way valve 15 c; the converged pure water returns to the booster pump 12 through the pure water return branch R, is mixed with tap water and then enters the two reverse osmosis filter elements again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out from the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the two reverse osmosis filter elements and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user 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 seven: please refer to fig. 7. In this embodiment, on the basis of the fifth embodiment, a post-filter element 17b is added to the pure water outlet pipes of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b before the pure water reflux branch R, and the type of the post-filter element 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start 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 and water flow from the first water outlet 112 are merged and flow to the third one-way valve 15c, 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 then enters the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

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 when the drinking water taking time of the user reaches a certain value (the first preset value 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; increaseThe pressure 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 into 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 value is preferably 10min-10h) is monitored, a pure water backflow procedure is started (the time is preferably 5-300s), and at the moment, the pure water is refluxed and the waste water is discharged; 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 is combined with water flow from the first water outlet 112, flows to the third one-way valve 15c, flows into the post-positioned filter element 17b, and returns to the booster pump 12 through the pure water backflow branch R, is mixed with the tap water and then enters the two reverse osmosis filter elements again, and raw water before the two reverse osmosis filter elements is flushed and neutralized; the wastewater flows out from the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into the first wastewater direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the two reverse osmosis filter elements, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example eight: please refer to fig. 8. In 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start 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 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 a path of pure water and a path of wastewater after secondary filtration, the pure water is merged with water flow from the first water outlet 112 and flows to the third one-way valve 15c, the pure water is discharged by a drinking water faucet for drinking after passing through the postposition 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 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 value is preferably 10min-10h) is monitored, a pure water backflow procedure is started (the time is preferably 5-300s), and at the moment, the pure water is refluxed and the waste water is discharged; 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 is combined with water flow from the first water outlet 112, flows to the third one-way valve 15c, flows into the post-positioned filter element 17b, and returns to the booster pump 12 through the pure water backflow branch R, is mixed with the tap water and then enters the two reverse osmosis filter elements again, and raw water before the two reverse osmosis filter elements is flushed and neutralized; waste materialThe water flows out from the waste water end of the second reverse osmosis filter element 11b and is directly discharged into the first waste water direct discharge pipeline Q₁(ii) a The process can complete the replacement of the original residual water in the two reverse osmosis filter elements, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example nine: please refer to fig. 9. In the embodiment, on the basis of the first embodiment, a second reverse osmosis filter element 11b is added and 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 flow limiting valve 14b and a third on-off valve 18c are arranged on the valve body, and the second flow limiting valve 14b has a flow limiting state and a full-open state; 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 fifth check valve 15e is arranged on the pump body, and the flow direction of the fifth check valve 15e flows from the second waste water inlet 116 to the pump inlet 121;

when the drinking water inlet 131 is communicated with the drinking water outlet 131a, the first high-pressure switch 16a is triggered, and the third switch valve 18c is closed; when the domestic water inlet 132 and the domestic water outlet 131b are communicated, the second flow restriction valve 14b is opened in a fully open state, and the third on/off valve 18c is closed.

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

The user turns on the tap (the domestic water inlet 132 is communicated with the domestic water outlet 131 b): when the second high-pressure switch 16b detects the pressure change, the first flow limiting valve 14a and the second flow limiting valve 14b are opened, and at the moment, the two reverse osmosis filter elements do not generate pure water; tap water respectively enters a first reverse osmosis filter element 11a and a second reverse osmosis filter element 11b after passing through a booster pump 12 (the pump is not started), then respectively flows out of the waste water ends of the two filter elements in two paths, and one path of tap water 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 before flowing back to the booster pump 12 through a first flow limiting valve 14a and a second flow limiting valve 14 b; the other path is directly discharged through a tap water faucet for domestic water, and part of the original waste water remained in the system is discharged through the tap water faucet. Namely, when a user opens a tap water faucet, a flushing program of the system is started, tap water with lower ion concentration can replace waste water with high ion concentration accumulated at the waste water side of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, and 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 backflow waterway, the first flow limiting valve 14a and the second flow limiting valve 14b, the risk that the two flow limiting valves are blocked 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 for domestic water, 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 when the drinking water taking time of the user reaches a certain value (the first preset value 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 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 value is preferably 10min-10h) is monitored, a pure water backflow procedure is started (the time is preferably 5-300s), and at the moment, the pure water is refluxed and the waste water is discharged; starting the booster pump 12, opening a first switch valve 18a, a second switch valve 18b and a third switch valve 18c, enabling tap water to respectively enter a first reverse osmosis filter element 11a and a second reverse osmosis filter element 11b, filtering and converging the tap water, returning the tap water to the booster pump 12 through a pure water backflow branch R, mixing the tap water with the tap water, and then enabling the mixed tap water to enter the two reverse osmosis filter elements again to flush and neutralize the raw water in front of the two reverse osmosis filter elements; the waste water of the two reverse osmosis filter elements is directly discharged into two waste water direct discharge pipelines; the process can complete the replacement of the original residual water in the wastewater pipelines of the two reverse osmosis filter elements, 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 and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

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

Example ten: please refer to fig. 10. In this embodiment, on the basis of the ninth embodiment, a 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start 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 eleven: please refer to fig. 11. In this embodiment, on the basis of the ninth embodiment, a post-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 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start 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 value is preferably 10min-10h) is monitored, a pure water backflow procedure is started (the time is preferably 5-300s), and at the moment, the pure water is refluxed and the waste water is discharged; starting the booster pump 12, opening a first switch valve 18a, a second switch valve 18b and a third switch valve 18c, enabling tap water to respectively enter a first reverse osmosis filter element 11a and a second reverse osmosis filter element 11b, filtering, converging the filtered tap water to flow into a post-positioned filter element 17b, mixing the filtered tap water with the tap water before returning to the booster pump 12 through a pure water return branch R, and then entering two reverse osmosis filter elements again to flush and neutralize the raw water in front of the two reverse osmosis filter elements; the waste water of the two reverse osmosis filter elements is directly discharged into two waste water direct discharge pipelines; the process can complete the replacement of the original residual water in the wastewater pipelines of the two reverse osmosis filter elements, 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 and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and waste water return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

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

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the drinking water outlet 131 a): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start 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.

In order to facilitate the control of the inflow water, on the basis of the above embodiment, an inflow valve may be disposed between the upstream of the front filter element 17a or the intersection of the flow path where the pump inlet 121 is located and the first branch P1 and the front filter element 17a, and the inflow valve is a valve body having a full-open or full-close function.

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

Claims

1. The utility model provides a waterway system with waste water is in line and pure water backward flow which characterized in that includes:

2. The waterway system of claim 1, wherein the first switch valve and the second switch valve are opened when the water outlet assembly is not continuously opened for a time exceeding a second preset value.

3. The waterway system of claim 1, wherein a third check valve is disposed in the flow path between the first water outlet and the first high pressure switch, and a fourth check valve is disposed in the flow path between the first waste water outlet and the second high pressure switch.

4. The waterway system of claim 3, further comprising a second reverse osmosis filter element disposed in the flow path between the first waste water port and the first restriction 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 port of the first restriction valve, and a second waste water port in communication with the flow path between the first water outlet port and the third one-way valve.

5. The waterway system with direct discharge of wastewater and return flow of pure water according to claim 3, further comprising a second reverse osmosis cartridge having a second water inlet, a second water outlet and a second wastewater outlet, the second water inlet communicating with the pump outlet, the second wastewater outlet communicating with one end of a second direct discharge wastewater pipeline, the second direct discharge wastewater pipeline having a second flow restriction valve and a third on/off valve, the second flow restriction valve having a flow restriction state and a fully open state; 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 fifth one-way valve is arranged on the second branch, and the flow direction of the fifth one-way valve flows from the second waste water port to the pump inlet;

6. The waterway system of claim 5, wherein the third switch valve is opened when the time when the discharging assembly is not continuously opened exceeds a second preset value.

7. The waterway system of one of the preceding claims 1 to 6, further comprising a pre-filter disposed upstream of the booster pump.

8. The waterway system of claim 7, wherein a water inlet valve is arranged between the upstream of the pre-filter element or the intersection of the flow path of the pump inlet and the first branch and the pre-filter element.

9. The waterway system of claim 7, further comprising a post-filter disposed in the flow path between the first reverse osmosis filter and the third one-way valve.

10. The waterway system of claim 7, wherein the outlet flow rate of the front filter element is not less than 8L/min.

11. The waterway system with direct drainage of wastewater and pure water reflux according to claim 9, wherein the preposed 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.

12. The waterway system of any one of claims 1 to 6, further comprising a post-filter disposed in the flow path between the first reverse osmosis filter and the third one-way valve.

13. A water purifier comprising the waterway system with the straight drainage of wastewater and the return flow of pure water as recited in any one of claims 1 to 12.