CN114275850A

CN114275850A - Waterway system and water purifier

Info

Publication number: CN114275850A
Application number: CN202111649660.9A
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 and a water purifier, wherein the waterway system enables wastewater generated in the process of purifying water by a reverse osmosis filter element to flow back to the 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 and water purifier

Technical Field

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

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 of 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 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, including:

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;

a first wastewater straight-line pipeline, one end of which is communicated with a flow path between the first wastewater inlet and the domestic water inlet;

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 state and a full-open state; the first switch valve is arranged at the downstream of the first current limiting valve, a flow path between the first switch valve and the first current limiting valve is communicated with the first water inlet through a first branch, and the first branch is provided with a first one-way valve; the flow direction of the first one-way valve flows from the first waste water port to the first water inlet;

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;

the pure water backflow branch is used for communicating a flow path between the first water outlet and the drinking water inlet with the first water inlet, 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 first water inlet;

when the drinking water inlet is communicated with the 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 water outlet exceeds a first preset value, the first switch valve is opened;

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

when the domestic water inlet is communicated with the water outlet, the second flow limiting valve is opened in a full-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 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 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, wherein the waterway system comprises:

The invention provides a reverse osmosis high-recovery pure water backflow system matched with a mechanical faucet. And (3) returning the wastewater generated by the reverse osmosis filter element in the water purification process to the front of the reverse osmosis filter element through a pipeline, mixing the wastewater with tap water, and then feeding the wastewater into the reverse osmosis filter element again for secondary filtration. The 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 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 waterway system according to a first embodiment of the present application;

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

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

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

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

FIG. 6 is a schematic flow diagram of a waterway system according to a sixth embodiment of the present application;

FIG. 7 is a schematic flow diagram of a waterway system according to a seventh embodiment of the present application;

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

FIG. 9 is a schematic flow diagram of a waterway system according to a ninth embodiment of the present application;

FIG. 10 is a schematic flow diagram of a waterway system according to a tenth embodiment of the present application;

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

fig. 12 is a schematic flow diagram of a waterway system according to a twelfth embodiment of the present application.

The reference numbers illustrate:

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

Detailed Description

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

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

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

The invention provides a waterway system and a water purifier provided with the same.

This waterway system 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. The first reverse osmosis filter element 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 the connecting rod is communicated; the water outlet assembly 13 has a water outlet 133 and drinking water inletA water inlet 131 and a domestic water inlet 132; the drinking water inlet 131 is communicated with the first water outlet 112, and the domestic water inlet 132 is communicated with the first waste water inlet 113; first wastewater straight-line pipeline Q₁One end is communicated with a flow path between the first waste water port 113 and the domestic water inlet 132; the first flow restriction valve 14a and the first switching valve 18a are provided in the first wastewater straight line Q₁The first flow restriction valve 14a has a flow restriction state (in the flow restriction state, the flow rate is small, and the flow rate may be 5% to 80% in a fully open state, and preferably, the flow rate may be 10% to 30% in the fully open state) and a fully open state; a first opening/closing valve 18a is provided downstream of the first flow restriction valve 14a, and a flow path between the first opening/closing valve 18a and the first flow restriction valve 14a passes through the first branch passage P₁A first branch P communicated with the first water inlet 111₁A first check valve 15 is arranged; the flow direction of the first check valve 15a flows from the first waste water port 113 to the first water inlet port 111; 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 pure water backflow branch R communicates a flow path between the first water outlet 112 and the drinking water inlet 131 with the first water inlet 111, a second switch valve 18b and a second one-way valve 15b are arranged on the pure water backflow branch R, and the flow direction of the second one-way valve 15b flows from the first water outlet 112 to the first water inlet 111;

when the drinking water inlet 131 and the water outlet 133 are communicated, 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 water outlet 133 exceeds a first preset value (preferably 1-5min), the first switch valve 18a is opened; when the domestic water inlet 132 and the drain port 133 are communicated, the first flow restriction valve 14a is opened in a fully open state, and the first opening/closing valve 18a is closed.

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

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 a domestic water tap, the first reverse osmosis filter element 11a and the wastewater return pipeline are washed by opening the domestic water tap (the domestic water inlet 132 is communicated with the domestic water outlet 131 b) by a 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 double-water tap is added into the wastewater backflow system, the pure water outlet end of the first reverse osmosis filter element 11a is divided into two paths, one path is directly connected with the drinking water end of the double-water tap, a third one-way valve 15c and a first high-pressure switch 16a are sequentially added on the pipeline, and the other path is a pure water backflow pipeline R used for returning the pure water to the front end of the first reverse osmosis filter element 11 a; the waste water outlet end of the first reverse osmosis filter element 11a is divided into two paths, one path is directly connected with the domestic water end of the double water taps, and a fourth one-way valve 15d and a second high-pressure switch 16b are sequentially arranged on the pipeline; the other path is a waste water return pipeline, waste water can flow back to the front of the booster pump 12 through a first flow limiting valve 14a, and a branch of the waste water return pipeline is a first waste water direct discharge pipeline Q₁And if necessary, the method is used for directly discharging the wastewater. The first flow limiting valve 14a on the waste water return pipeline is a valve body with a flow limiting function; first wastewater straight-line pipeline Q₁The first on-off valve 18a and the second on-off valve 18b on the pure water return line R are valve bodies 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 existence of the third check valve 15c, when the drinking water tap is closed, water is limited between the third check valve 15c and the tap, the water pressure is kept stable, and the first high-pressure switch 16a receives a stable pressure signal and keepsAn off state.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): 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 flows back to the pump through the first flow limiting valve 14a and is mixed with the tap water to enter the first reverse osmosis filter element 11a again for filtration, and zero discharge of the wastewater is realized.

The user turns on the life tap (the life water inlet 132 is communicated with the water outlet 133): the 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 waste water port in two ways, one way flows back to the front of the pump through the first flow limiting valve 14a and is mixed with the tap water to pass through the first reverse osmosis filter element 11a again, and the first flow limiting valve 14a is in a fully open state 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 domestic tap for domestic water, and the residual raw wastewater in part of the system is discharged through the domestic tap. Namely, when a user opens the living 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 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 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 opens, and the waste water that first reverse osmosis filter core 11a produced is discharged along with waste water straight drainage pipe way, and initial level can be resumeed in the play water TDS short time, and weak to drinking water flow 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; 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 pump through the pure water return pipeline R and is mixed with the tap water to enter the first reverse osmosis filter element 11a again, and the pure water flushes and neutralizes the raw water in front of the first reverse osmosis filter element 11 a; the wastewater flows out from the wastewater end and is directly discharged into a wastewater straight discharge pipeline; the procedure can complete the replacement of original residual old water in the first reverse osmosis filter element 11a and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; meanwhile, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under the normal condition, the user opens life tap and can accomplish the washing to first reverse osmosis filter core 11a and waste water return line, and this procedure mainly used avoids having no use life water needs again after the user has got the drinking water, makes the residual water be detained in first reverse osmosis filter core 11a and return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example two: please refer to fig. 2. In this embodiment, a pre-filter 17a is added to the front end of the booster pump 12, the type of the pre-filter 17a may be PP with different forms, activated carbon with different forms, ultrafiltration, nanofiltration, or a composite filter of the above materials, and the pre-effluent flow rate 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): 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 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 pump through the first flow limiting valve 14a and is mixed with the preposed outlet water to enter the first reverse osmosis filter element 11a again for filtration, and zero discharge of the waste water is realized.

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 and before the pure water return pipe, 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): 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 flows back to the front of the pump through the first flow limiting valve 14a to be mixed with the tap water and then enters the first reverse osmosis filter element 11a for secondary 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, and after entering the first reverse osmosis filter element 11a, tap water returns to the front of the pump through the pure water return pipeline R and is mixed with the tap water to enter the first reverse osmosis filter element 11a again, so that the 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 wastewater straight discharge pipeline; 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 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 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 return pipeline; 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 preposed effluent flow 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): 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 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 pump through the first flow limiting valve 14a and is mixed with the front effluent to enter the first reverse osmosis filter element 11a again for secondary filtration, so that zero discharge of the wastewater is realized.

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 the 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 first waste water inlet 113 of the first reverse osmosis filter element 11a is connected with the second water inlet 114 of the second reverse osmosis filter element 11b, 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 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 water outlet 133): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; after the 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, and the pure water flows into a first pure water pipeline S₁The wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration to be divided into a path of pure water and a path of wastewater, and the pure water flows into the second pure water pipeline S₂And a first pure water pipeline S₁Converge, discharge for drinking through the drinking water tap, waste water mixes with running water reentrant first reverse osmosis filter core 11a and filters again before first restriction valve 14a backward flow reaches the pump, realizes the zero release of waste water.

The user turns on the life tap (the life water inlet 132 is communicated with the water outlet 133): 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 and then flows out of the waste water end of the first reverse osmosis filter element 11a, enters the second reverse osmosis filter element 11b and then flows out of the waste water end of the second reverse osmosis filter element 11b in two ways, one way of tap water flows back to the front of the pump through the first flow limiting valve 14a and is mixed with the tap water to enter the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again, and the first flow limiting valve 14a is in a fully open state and has a large flow, so that a waste water backflow water channel 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 elements are prolonged; the other path is directly discharged through a domestic tap for domestic water, and the residual raw wastewater in part of the system is discharged through the domestic tap. Namely, when a user opens the domestic 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 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 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 switching valve 18a and the second switching valve 18b are opened, and the tap waterAfter water enters the first reverse osmosis filter element 11a, dividing into a path of pure water and a path of wastewater, wherein the pure water flows into a first pure water pipeline S₁The wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration to be divided into a path of pure water and a path of wastewater, and the pure water flows into the second pure water pipeline S₂And a first pure water pipeline S₁Converging; the converged pure water returns to the front of the pump through a pure water return pipeline R and is mixed with tap water to enter the first reverse osmosis filter element 11a again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out of the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into a wastewater straight discharge pipeline; 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 has got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example six: please refer to fig. 6. In this embodiment, a front filter element 17a is added to the front end of the booster pump 12, the type of the front filter element 17a may be PP with different forms, activated carbon with different forms, ultrafiltration, nanofiltration, or a composite filter element of the above materials, and the front effluent flow rate 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; after the tap water is coarsely filtered by the preposed filter element 17a and 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, and the pure water flows into the first pure water pipeline S₁The wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration to be divided into a path of pure water and a path of wastewater, and the pure water flows into the second pure water pipeline S₂And a first pure water pipeline S₁Converging, discharging for drinking via a drinking water tap, the waste water passing through a first flow restrictionThe valve 14a flows back to the front of the pump to be mixed with the front outlet water and then enters the first reverse osmosis filter element 11a for secondary filtration, so that zero discharge of 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, 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, and the pure water flows into the first pure water pipeline S₁The wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration to be divided into a path of pure water and a path of wastewater, and the pure water flows into the second pure water pipeline S₂And a first pure water pipeline S₁Converging; the converged pure water returns to the front of the pump through a pure water return pipeline R and is mixed with tap water to enter the first reverse osmosis filter element 11a again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out of the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into a wastewater straight discharge pipeline; 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 has got the drinking water, makes the residual water be detained in two reverse osmosis filter cores and 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, 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 return line 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; after the 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, and the pure water flows into a first pure water pipeline S₁The wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration to be divided into a path of pure water and a path of wastewater, and the pure water flows into the second pure water pipeline S₂And a first pure water pipeline S₁The wastewater is discharged by a drinking water faucet for drinking after passing through the rear filter element 17b, and the wastewater flows back to the pump through the first flow limiting valve 14a and is mixed with tap water 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 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, and the pure water flows into the first pure water pipeline S₁The wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration to be divided into a path of pure water and a path of wastewater, and the pure water flows into the second pure water pipeline S₂And a first pure water pipeline S₁After converging and flowing into the post-positioned filter element 17b, the water returns to the pump through a pure water return pipeline R and is mixed with tap water to enter the first reverse osmosis filter element 11a again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out of the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into a wastewater straight discharge pipeline; the process can complete the replacement of the original residual water in the two reverse osmosis filter elements, the post filter element 17b and the waste water pipeline, solve the problems of first cup of water and old water, has stable water quality and provides pure fresh water all the time; simultaneously prevent two reverse osmosis filter elements and the firstThe flow-limiting valve 14a is fouled, 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 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 front filter element 17a is added at the front end of the booster pump 12, and a rear filter element 17b is added on the pure water outlet pipelines of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b and in front of the pure water return pipeline 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 preposed effluent flow 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): when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; after being roughly filtered by the preposed filter element 17a and flowing into the first reverse osmosis filter element 11a, tap water is divided into one path of pure water and one path of wastewater, and the pure water flows into the first pure water pipeline S₁The wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration to be divided into a path of pure water and a path of wastewater, and the pure water flows into the second pure water pipeline S₂And a first pure water pipeline S₁The wastewater 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 pump through the first flow limiting valve 14a to be mixed with the front effluent 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), the pure water reflux is startedProcedure (time preferably 5-300s), in which both pure water is refluxed and 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, and the pure water flows into the first pure water pipeline S₁The wastewater flows into the second reverse osmosis filter element 11b and is subjected to secondary filtration to be divided into a path of pure water and a path of wastewater, and the pure water flows into the second pure water pipeline S₂And a first pure water pipeline S₁After converging and flowing into the post-positioned filter element 17b, the water returns to the pump through a pure water return pipeline R and is mixed with tap water to enter the first reverse osmosis filter element 11a again, and the raw water in front of the two reverse osmosis filter elements is washed and neutralized; the wastewater flows out of the wastewater end of the second reverse osmosis filter element 11b and is directly discharged into a wastewater straight discharge pipeline; 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 return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example nine: please refer to fig. 9. In this embodiment, a second reverse osmosis filter element 11b is added on the basis of the first embodiment, and is connected with the first reverse osmosis filter element 11a in parallel. The second reverse osmosis filter element 11b is provided with a second water inlet 114, a second water outlet 115 and a second waste water outlet 116, the second water inlet 114 is communicated with the pump outlet 122, and the second waste water outlet 116 and a second waste water direct discharge pipeline Q₂Is communicated with the first waste water direct discharge pipeline Q₂A second current limiting valve 14b and a third switch valve 18c are arranged on the valve body, and the second current limiting valve 14b has a current limiting function; a third on-off valve 18c is located downstream of the second flow limiting valve 14b, and a flow path between the third on-off valve 18c and the second flow limiting valve 14b passes through the second branch passage P₂In communication with the pump inlet 121, a second branch P₂Is provided with a fifth one-way valve 15e, a fifth check valveThe flow to the valve 15e is from the second waste water port 116 to the pump inlet 121.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): 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, and pure water pipelines of the two reverse osmosis filter elements are converged after filtration and are discharged through a drinking water faucet for drinking; the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b, is mixed with tap water and then enters the two reverse osmosis filter elements again for secondary filtration, and zero discharge of the wastewater is realized.

The user turns on the life tap (the life water inlet 132 is communicated with the water outlet 133): 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 the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b after passing through the booster pump 12 (the pump is not started), then respectively flows out of the waste water ends of the two reverse osmosis filter elements in two ways, one way of the tap water flows back to the front of the pump through the first flow limiting valve 14a and the second flow limiting valve 14b and then is mixed with the tap water to enter the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again, and the first flow limiting valve 14a and the second flow limiting valve 14b are in a fully open state and have larger flow, so that a waste water return water channel and the first flow limiting valve 14a and the second flow limiting valve 14b can be flushed, the risk of blockage of the first flow limiting valve 14a and the second flow limiting valve 14b due to scaling is reduced, and the service lives of the two reverse osmosis filter elements are prolonged; the other path is directly discharged through a domestic tap for domestic water, and the residual raw wastewater in part of the system is discharged through the domestic tap. Namely, when a user opens the domestic 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 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 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 water making state promptly, and first current-limiting valve 14a, second current-limiting valve 14b, first ooff valve 18a and third ooff valve 18c open, and the waste water that two reverse osmosis filter cores produced is discharged along with the straight discharge line of waste water, and the initial level can be resumeed in the effluent TDS short time, and is little 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, then converging pure water pipelines of the two reverse osmosis filter elements after filtration, returning to the pump through a pure water return pipeline R, mixing with the tap water, then entering the two reverse osmosis filter elements again, flushing and neutralizing 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 a waste water straight discharge pipeline; 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 core waste water return lines, 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 return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

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

Example ten: please refer to fig. 10. In this embodiment, on the basis of the ninth embodiment, a pre-filter 17a is added to the front end of the booster pump 12; the 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, and the preposed effluent flow 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): 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 respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, and after filtration, pure water pipelines of the two reverse osmosis filter elements are converged and discharged through 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 the front effluent, 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 17b is added to the pure water outlet merging pipeline of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b before the pure water return pipeline 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): 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, pure water pipelines of the two reverse osmosis filter elements are converged after filtration, and the running water is discharged by a drinking water tap for drinking after passing through the post-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; the booster pump 12 is started, the first switch valve 18a, the second switch valve 18b and the third switch valve 18c are opened, tap water respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, after filtration, pure water pipelines of the two reverse osmosis filter elements are converged and flow into the post filter element 17b, and then the pure water returns to the pump through the pure water return pipeline R to be mixed with the tap water and then enters the two reverse osmosis filter elements again, so that raw water in front of the two reverse osmosis filter elements is washed and neutralized; the waste water of the two reverse osmosis filter elements is directly discharged into a waste water straight discharge pipeline; 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 return line for a long time, causes first glass of water and incrustation scale deposit and influences life's problem.

Example twelve: please refer to fig. 12. In this embodiment, on the basis of the ninth embodiment, a front filter element 17a is added at the front end of the booster pump 12, and a rear filter element 17b is added on a pure water outlet water converging pipeline of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b and in front of a pure water return pipeline 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 preposed effluent flow 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): 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 respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, and after being filtered, pure water pipelines of the two reverse osmosis filter elements are converged, and after passing through the postposition filter element 17b, the tap water is discharged by a drinking water tap 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 the front effluent, and then enters the two reverse osmosis filter elements again for secondary filtration, so that zero discharge of the wastewater is realized.

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

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

Claims

1. A waterway system, comprising:

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

3. The waterway system of claim 2, 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 cartridge disposed in the flow path between the first waste water port and the first constrictor valve, the second reverse osmosis cartridge having a second water inlet in communication with the first waste water port, a second water outlet in communication with the water inlet end of the first 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.

5. The waterway system of claim 3, further comprising a second reverse osmosis cartridge having a second water inlet, a second water outlet, and a second waste water port, the second water inlet being in communication with the pump outlet, the second waste water port being in communication with one end of a second waste water in-line, the second waste water in-line being provided with 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 water outlet assembly is not continuously opened exceeds a second preset value.

7. The waterway system of any of claims 2-6, further comprising a pre-filter disposed upstream of the booster pump.

8. The waterway system of claim 7, wherein a fill valve is disposed between the prepositioned filter element and a location upstream of the prepositioned filter element or where the pump inlet is located at the intersection of the flow path and the first branch.

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

10. The waterway system of claim 7, wherein the water output of the pre-filter element is less than 8L/min.

11. The waterway system of claim 9, 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.

12. The waterway system of any of claims 2-6, further comprising a post-positioned filter element disposed in the flow path between the first reverse osmosis filter element and the third one-way valve.

13. A water purifier comprising a waterway system according to any one of claims 1 to 12.