CN216808234U

CN216808234U - Waterway system with double TDS probes

Info

Publication number: CN216808234U
Application number: CN202123445943.XU
Authority: CN
Inventors: 宾倩韵; 刘梦薇; 孙天厚; 谈菲
Original assignee: Foshan Midea Qinghu Water Purification Equipment Co ltd; Midea Group Co Ltd
Current assignee: Foshan Midea Qinghu Water Purification Equipment Co ltd; Midea Group Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-06-24
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a waterway system with double TDS probes, which comprises a booster pump, a first reverse osmosis filter element, a drinking water outlet assembly, a domestic water outlet assembly, a first wastewater direct discharge pipeline, a first branch, a first high-pressure valve assembly, a second high-pressure valve assembly, a first TDS probe, a second TDS probe and an electric control unit, wherein the booster pump is connected with the first reverse osmosis filter element; the domestic water outlet assembly is provided with a domestic water inlet and a domestic water outlet, the drinking water outlet assembly is provided with a drinking water inlet and a drinking water outlet, a water inlet of the first reverse osmosis filter element is communicated with a water inlet of the booster pump, and a first flow limiting valve and a first switch valve are sequentially arranged on a first wastewater direct discharge pipeline along a flow path from the upstream to the downstream of the first wastewater direct discharge pipeline; the pipeline between first restriction valve and the first ooff valve passes through the water inlet intercommunication of first branch road with the booster pump, and electronic control unit connects booster pump, first high pressure valve subassembly, second high pressure valve subassembly, first restriction valve, first ooff valve, first TDS probe and second TDS probe. The scheme can reduce the discharge of waste water.

Description

Waterway system with double TDS probes

Technical Field

The utility model relates to the technical field of water purifiers, in particular to a waterway system with double TDS probes.

Background

By the reverse osmosis process, water can be passed from a solution with a high concentration to a solution with a low concentration. Since inorganic ions, colloidal substances and macromolecular solutes cannot pass through the reverse osmosis cartridge, unwanted substances remain at the end of the high concentration solution and the lower concentration end of the solution receives purified pure water during this process. The process of the core part reverse osmosis filter element of the water path system 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.

SUMMERY OF THE UTILITY MODEL

The main objective of this application is to provide a waterway system with two TDS probes, aims at solving the too much problem that is unfavorable for resource utilization of the waste water that waterway system in the current water purifier produced.

To achieve the above object, the present invention provides a waterway system with a dual TDS probe, comprising:

the domestic water outlet assembly waterway system is provided with a domestic water inlet waterway system communicated with the wastewater port of the first reverse osmosis filter element waterway system and a domestic water outlet waterway system which can be communicated and blocked with the domestic water inlet waterway system;

a first wastewater direct discharge pipeline waterway system, one end of which is communicated with a pipeline between a wastewater port of the first reverse osmosis filter element waterway system and the domestic water inlet waterway system, wherein a first flow limiting valve waterway system and a first switch valve waterway system are sequentially arranged on the first wastewater direct discharge pipeline waterway system along a flow path from the upstream to the downstream of the first wastewater direct discharge pipeline waterway system, and the first flow limiting valve waterway system has a flow limiting state and a full-open state;

the pipeline between the first limiting valve waterway system and the first switch valve waterway system is communicated with the water inlet of the booster pump waterway system through the first branch waterway system, and the first branch waterway system is provided with a first check valve waterway system facing the water inlet of the booster pump waterway system;

the first high-pressure valve assembly and the second high-pressure valve assembly are respectively and correspondingly arranged between the water outlet of the first reverse osmosis filter element waterway system and the drinking water inlet waterway system and between the waste water port of the first reverse osmosis filter element waterway system and the domestic water inlet waterway system;

the first TDS probe waterway system and the second TDS probe waterway system are respectively and correspondingly arranged at the upstream of the booster pump waterway system and between the first reverse osmosis filter element waterway system and the first high-pressure valve assembly;

and the electric control unit is connected with the booster pump water path system, the first high-pressure valve assembly, the second high-pressure valve assembly, the first flow limiting valve water path system, the first switch valve water path system, the first TDS probe water path system and the second TDS probe water path system.

Waterway system with two TDS probes still includes second reverse osmosis filter core waterway system, second reverse osmosis filter core waterway system set up in first reverse osmosis filter core waterway system's waste water mouth with on the flow path between the first restriction valve waterway system, second reverse osmosis filter core waterway system's water inlet with first reverse osmosis filter core waterway system's waste water mouth intercommunication, second reverse osmosis filter core waterway system's waste water mouth and first restriction valve waterway system's the end intercommunication of intaking, second reverse osmosis filter core waterway system's delivery port pass through second pure water pipeline waterway system with first pure water pipeline waterway system intercommunication, and intercommunication department is located second TDS probe waterway system's upper reaches.

In one embodiment, the waterway system with the double TDS probes further comprises a second reverse osmosis filter element waterway system, a water inlet of the second reverse osmosis filter element waterway system is communicated with a water outlet of the booster pump waterway system, a waste water outlet of the second reverse osmosis filter element waterway system is communicated with one end of a second waste water direct discharge pipeline waterway system, and the second waste water direct discharge pipeline waterway system is provided with a second flow limiting valve waterway system and a second switch valve waterway system; the second switch valve waterway system is located at the downstream of the second flow limiting valve waterway system, a flow path between the second switch valve waterway system and the second flow limiting valve waterway system is communicated with the pump inlet waterway system through a second branch waterway system, and a fourth one-way valve waterway system towards the water inlet of the booster pump waterway system is arranged on the second branch waterway system.

In an embodiment, the waterway system with the double TDS probes further comprises a pre-filter waterway system, and the pre-filter waterway system is arranged between the booster pump waterway system and the first TDS probe waterway system.

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 with the dual TDS probes further includes a post-filter waterway system disposed on the first pure water pipeline waterway system and upstream of the second TDS probe waterway system.

In one embodiment, the water outlet flow of the preposed filter element water path system is more than or equal to 8L/min.

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

In an embodiment, the waterway system with the dual TDS probes further includes a post-filter waterway system disposed on the first pure water pipe waterway system and upstream of the second TDS probe waterway system.

In one embodiment, the first high pressure valve comprises a first high pressure switch waterway system and a second check valve waterway system, the second check valve waterway system being located upstream of the first high pressure switch waterway system; the second high pressure valve assembly includes a second high pressure switch waterway system and a third check valve waterway system, the third check valve waterway system is located upstream of the second high pressure switch waterway system.

In one embodiment, the preset desalination rate of the waterway system with the double TDS probes is 70% to 95%.

Drawings

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

FIG. 1 is a schematic flow diagram of a first embodiment of a waterway system with a dual TDS probe according to the present application;

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

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

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

FIG. 5 is a schematic flow diagram of a fifth embodiment of a waterway system with dual TDS probes 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 with a dual TDS probe;

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

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

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

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

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

FIG. 12 is a schematic flow diagram of a waterway system according to a twelfth embodiment of the present application with a dual TDS probe.

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
				Q₂	Second wastewater direct discharge pipeline	Q₁	First wastewater direct discharge pipeline
P₂	Second branch	14a	First flow limiting valve
				14b	Second flow limiting valve	15a	First one-way valve
15b	Second check valve	15c	Third check valve
				15d	Fourth check valve	16a	A first high voltage switch
16b	Second high-voltage switch	13a	Drinking water outlet assembly
				131	Drinking water inlet	131a	Drinking water outlet
132	Water inlet for domestic water	131b	Domestic water outlet
				13b	Domestic water outlet assembly	17a	Front-mounted filter element
17b	Rear filter element	18a	First switch valve
				18b	Second switch valve	19a	First TDS Probe
19b	Second TDS Probe	S1	First pure water pipeline
				S2	A first pure water pipeline

The implementation, functional features and advantages of the present invention will be further described 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 utility model provides a reverse osmosis high-recovery intelligent system connected with a tap water faucet. And (3) returning the wastewater generated by the reverse osmosis filter element in the water purification process to the front of the reverse osmosis filter element through a pipeline, mixing the wastewater with tap water, and then feeding the wastewater into the reverse osmosis filter element again for secondary filtration.

The waste water that the reverse osmosis filter core produced except that before backward flow to the reverse osmosis filter core through the return line, this system still links to each other reverse osmosis filter core waste water with the current kitchen tap of user family, not only can improve the rate of utilization of space, reduce cost, still can open running water tap through the user and accomplish the washing to reverse osmosis filter core and waste water return line, and waste water discharge supplies the user to live and uses, accomplishes the reutilization to waste water, satisfies ecological environmental protection's requirement. In addition, still added TDS probe and the straight pipeline of waste water of a way, can be used to directly discharge waste water when detecting that the effluent desalination rate is not up to standard.

The first embodiment is as follows: see fig. 1. A mechanical drinking water faucet is added into the wastewater backflow system, a pure water outlet end of the first reverse osmosis filter element 11a is connected with the head end of the drinking water faucet, and a second one-way valve 15b and a first high-pressure switch 16a are sequentially added on a pipeline; 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 third one-way valve 15c and a second high-pressure switch 16b are sequentially added on a pipeline; the other path is a waste water return line, waste water can flow back to the front of the booster pump 12 through the first flow limiting valve 14a, and a branch of the waste water return line is a first waste water direct discharge line Q1 which is used for direct discharge of waste water if necessary. A first TDS probe 19a is arranged at the front end of the reverse osmosis filter element of the first reverse osmosis filter element 11a and the waste water return pipeline and is used for detecting the TDS of the tap water inlet water; the reverse osmosis rear end of the first reverse osmosis filter element 11a is provided with a second TDS probe 19b for detecting the TDS of the pure water effluent; the first flow limiting valve 14a on the wastewater return pipeline is a valve body with a flow limiting function (in a flow limiting state, the flow is small, the flow can be 5% -80% in a fully open state, and preferably, the flow can be 10% -30% in the fully open state); the first on-off valve 18a in the first wastewater straight line Q1 is a valve body having a fully open or fully closed function. The second non return valve 15b, in combination with the first high pressure switch 16a, avoids frequent activation: due to the second check valve 15b, when the drinking tap is closed, water is confined between the second check valve 15b and the tap, the water pressure is kept stable, and the first high-pressure switch 16a receives a stable pressure signal and keeps an off state.

The user opens the drinking water tap: 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 opens the tap water: 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 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, so that the risk of blockage of the first flow limiting valve 14a due to scaling is reduced, and the service life of the first reverse osmosis filter element 11a is further prolonged. When the tap is opened, the waste water generated and accumulated in the water making process can be discharged through the tap for domestic water, so that the waste water utilization is realized in a real sense.

Wastewater straight-line procedure 1: when the user got the drinking water, because the waste water backward flow, it can increase along with the increase of water intaking time to go out the water TDS, consequently, when first TDS probe 19a and second TDS probe 19b detected that the system desalination is less than the setting value (preferred 70-95%), start the straight line procedure of waste water (preferred 5-300s of time), booster pump 12 keeps starting, keeps normal system water state promptly, first ooff valve 18a opens, the waste water that first reverse osmosis filter core 11a produced is discharged along with the straight calandria of waste water, can resume initial level in the play water TDS short time, and weak to drinking water flow influence.

Wastewater straight-line procedure 2: when the user is monitored not to use the water purifier for a long time (preferably 10min-10h), starting a waste water direct discharge program (preferably 5-300 s); the booster pump 12 is not started, the first flow limiting valve 14a and the first switch valve 18a are opened, tap water flows out from the wastewater end after entering the first reverse osmosis filter element 11a depending on the pressure of tap water and is directly discharged into the wastewater straight discharge pipeline, so that the replacement of water in the first reverse osmosis filter element 11a and the wastewater pipeline is completed, the scaling of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prevented, and the service lives of the reverse osmosis filter element and the first flow limiting valve 14a are prolonged. Under the normal condition, the user opens 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 domestic water needs again after the user got the drinking water, makes backward flow waste water be detained for a long time in first reverse osmosis filter core 11a and return line, causes the incrustation scale deposit and influences life's problem.

Example two: see 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 flow rate of front-mounted effluent is more than or equal to 8L/min, and kitchen water is not limited and is equal to tap water. The first TDS probe 19a is either before the wastewater return line, before the pre-filter 17a or after the pre-filter 17 a.

The user opens the drinking water tap: 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 pump through the first flow limiting valve 14a and is mixed with the water discharged by the large-flux preposed filter element 17a, and the mixture enters the first reverse osmosis filter element 11a again for secondary filtration, so that zero discharge of the wastewater is realized.

The user opens the tap water: 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 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.

Example three: see fig. 3. In this embodiment, on the basis of the first embodiment, a post-filter element 17b is added in front of the second one-way valve 15b and the first high-pressure switch 16a on the pure water outlet pipeline of the first reverse osmosis filter element 11a, and the type of the post-filter element 17b can be activated carbon with different forms. The second TDS probe 19b is behind the first reverse osmosis filter element 11a, before or after the post filter element 17b, the second one-way valve 15b and the first high-voltage switch 16 a.

The user opens the drinking water tap: 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 is discharged by a drinking water faucet for drinking after passing through the post-positioned 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 tap water to enter the first reverse osmosis filter element 11a again for filtration, so that zero discharge of the wastewater is realized.

Example four: see 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 the second one-way valve 15b and the first high-pressure switch 16 a; 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 preposed effluent flow 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 first TDS probe 19a is arranged in front of the wastewater return line, in front of the pre-filter element 17a or behind the pre-filter element 17 a; the second TDS probe 19b is behind the first reverse osmosis filter element 11a, before or after the post filter element 17b, the second one-way valve 15b and the first high-voltage switch 16 a.

The user opens the drinking water tap: 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 front of the pump 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.

Example five: see fig. 5. In this embodiment, a second reverse osmosis filter element 11b is added on the basis of the first embodiment, 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 opens the drinking water tap: when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; tap water 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 into the first pure water pipeline S1, the wastewater flows into the second reverse osmosis filter element 11b and is divided into a path of pure water and a path of wastewater after secondary filtration, the pure water flows into the second pure water pipeline S2 and is converged with the first pure water pipeline S1, the pure water is discharged through the drinking water faucet for drinking, the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and then is mixed with the tap water to enter the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

The user opens the tap water: 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 pump through the first flow limiting valve 14a in one path to be mixed with the tap water before entering the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again; because the first flow limiting valve 14a is in a fully open state and has a large flow rate, the wastewater return 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 elements 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. When a user opens a tap, a flushing program of the system is started, tap water with low ion concentration can replace wastewater with high ion concentration accumulated at the wastewater side of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, 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, so that 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 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.

Wastewater straight-line procedure 1: when the user got the drinking water, because the waste water backward flow, it can increase along with the increase of water intaking time to go out the water TDS, consequently, when first TDS probe 19a and second TDS probe 19b detected that the system desalination is less than the setting value (preferred 70-95%), start the straight row procedure of waste water (preferred 5-300s of time), booster pump 12 keeps starting, keeps normal system water state promptly, first ooff valve 18a opens, the waste water that two reverse osmosis filter core produced is discharged along with the straight calandria of waste water, can resume initial level in the play water TDS short time, and weak to drinking water flow.

Wastewater straight-line procedure 2: when the user is monitored not to use the water purifier for a long time (preferably 10min-10h), starting a waste water direct discharge program (preferably 5-300 s); the booster pump 12 is not started, the first flow limiting valve 14a and the first switch valve 18a are opened, tap water flows out from a wastewater end after sequentially entering the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b depending on the pressure of tap water, and is directly discharged into a wastewater straight discharge pipeline, so that the replacement of water in the first reverse osmosis filter element 11a, the second reverse osmosis filter element 11b and the wastewater pipeline is completed, the first reverse osmosis filter element 11a, the second reverse osmosis filter element 11b 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 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 domestic water needs again after the user has got the drinking water, makes backward flow waste water be detained in two reverse osmosis filter cores and return line for a long time, causes the incrustation scale deposit and influences life's problem.

Example six: see 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 flow rate of front-mounted effluent is more than or equal to 8L/min, and kitchen water is not limited and is equal to tap water. The first TDS probe 19a is either before the wastewater return line, before the pre-filter 17a or after the pre-filter 17 a.

The user opens the drinking water tap: when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; after running water flows into the first reverse osmosis filter element 11a, the running water is divided into one path of pure water and one path of wastewater, the pure water flows into the first pure water pipeline S1, the wastewater flows into the second reverse osmosis filter element 11b and is divided into one path of pure water and one path of wastewater after secondary filtration, the pure water flows into the second pure water pipeline S2 and is converged with the first pure water pipeline S1, the pure water is 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 is mixed with the running water to reenter the first reverse osmosis filter element 11a for secondary filtration, and zero discharge of the wastewater is realized.

The user opens the tap water: 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 pump through the first flow limiting valve 14a in one path to be mixed with the tap water before entering the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again; because the first flow limiting valve 14a is in a fully open state and has a large flow rate, the wastewater return 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 elements 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.

Example seven: see 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, in front of the second check valve 15b and the first high-pressure switch 16a, and the type of the post-filter element 17b may be activated carbon of different forms. The second TDS probe 19b is behind the first reverse osmosis filter element 11a, before or after the post filter element 17b, the second one-way valve 15b and the first high-voltage switch 16 a.

The user opens the drinking water tap: when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; tap water 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 into the first pure water pipeline S1, the wastewater flows into the second reverse osmosis filter element 11b and is divided into a path of pure water and a path of wastewater after secondary filtration, the pure water flows into the second pure water pipeline S2 and is converged with the first pure water pipeline S1, the pure water is discharged by a drinking water faucet for drinking after passing through the rear filter element 17b, the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and is mixed with the tap water to enter the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

The user opens the tap water: 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) and then flows out from the waste water end of the first reverse osmosis filter element 11a, enters the second reverse osmosis filter element 11b and then flows out from the waste water end of the second reverse osmosis filter element 11b in two ways, and one way of water flows back to the pump through the first flow limiting valve 14a 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; because the first flow limiting valve 14a is in a fully open state and has a large flow rate, the wastewater return 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 elements 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; and because the domestic water flow is larger, when passing through the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, pollutants such as incrustations, organic matters and the like deposited on the side surfaces of the waste water 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.

Example eight: see fig. 8. In the embodiment, on the basis of the fifth embodiment, a large-flux front filter element 17a is additionally arranged at the front end of the booster pump 12, and a rear filter element 17b is additionally arranged before the second check valve 15b and the first high-pressure switch 16 a; 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 preposed effluent flow 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 first TDS probe 19a is arranged in front of the wastewater return line, in front of the pre-filter element 17a or behind the pre-filter element 17 a; the second TDS probe 19b is behind the first reverse osmosis filter element 11a, before or after the post filter element 17b, the second one-way valve 15b and the first high-voltage switch 16 a.

The user opens the drinking water tap: 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 into the first pure water pipeline S1, the wastewater flows into the second reverse osmosis filter element 11b and is divided into a path of pure water and a path of wastewater after secondary filtration, the pure water flows into the second pure water pipeline S2 to be converged with the first pure water pipeline S1, the pure water is discharged by a drinking water faucet for drinking after passing through the rear filter element 17b, the wastewater flows back to the front of the pump through the first flow limiting valve 14a and is mixed with the large-flux front effluent to enter the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

The user opens the tap water: 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 pump through the first flow limiting valve 14a in one path to be mixed with the tap water before entering the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again; because the first flow limiting valve 14a is in a full-open state, the flow is large, 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.

Example nine: see 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 of the second reverse osmosis filter element 11b is communicated with the outlet of the booster pump 12, the second waste water outlet 116 of the second reverse osmosis filter element 11b is communicated with one end of a second waste water direct discharge pipeline Q2, a second flow limiting valve 14b and a second switch valve 18b are arranged on the second waste water direct discharge pipeline Q2, and the second flow limiting valve 14b has a flow limiting state and a full open state; the second switching valve 18b is located downstream of the second flow restriction valve 14b, a flow path between the second switching valve 18b and the second flow restriction valve 14b communicates with the pump inlet 121 through a second branch P2, and a fourth check valve 15d that flows toward the inlet 121 of the booster pump 12 is provided in the second branch P2. The electronic control unit is used for closing the second switch valve 18b when sensing a signal that the high-voltage switch 16 is triggered; and when the salt rejection detected by the first TDS acquisition probe 19a and the second TDS acquisition probe 19b is lower than a preset value, the second on-off valve 18b is opened.

The user opens the drinking water tap: 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 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 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 opens the tap water: the second high-pressure switch 16b detects the pressure change, and opens the first flow limiting valve 14a and the second flow limiting valve 14b, and at the moment, the two reverse osmosis filter elements do not produce 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 two reverse osmosis filter element waste water ends 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 path 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 tap water faucet for domestic water use, 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.

Wastewater straight-line procedure 1: when the user got the drinking water, because the waste water backward flow, the play water TDS can increase along with the increase of water intaking time, consequently, when first TDS probe 19a and second TDS probe 19b detected that the system desalination is less than the setting value (preferred 70-95%), start the straight row procedure of waste water (preferred 5-300s of time), booster pump 12 keeps starting, keeps normal system water state promptly, first ooff valve 18a and second ooff valve 18b open, the waste water that two reverse osmosis filter core produced is discharged along with the straight row pipeline of waste water, the initial level can be resumeed to play water TDS short time, and it is less to drinking water flux influence.

Wastewater straight-line procedure 2: when the user is monitored not to use the water purifier for a long time (preferably 10min-10h), starting a waste water direct discharge program (preferably 5-300 s); the booster pump 12 is not started, the first flow limiting valve 14a, the second flow limiting valve 14b, the first switch valve 18a and the second switch valve 18b are opened, tap water flows out of the wastewater end after entering the two reverse osmosis filter elements by means of tap water pressure and is directly discharged into the wastewater straight discharge pipeline, the replacement of water in the two reverse osmosis filter elements and the wastewater pipeline is completed, the two reverse osmosis filter elements, 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 elements and the two flow limiting valves are prolonged. Under the normal condition, the user opens 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 domestic water needs again after the user has got the drinking water, makes backward flow waste water be detained in two reverse osmosis filter cores and return line for a long time, causes the incrustation scale deposit and influences life's problem.

For this embodiment, it should be noted that, since the flow limiting valve and the check valve are respectively disposed on the first branch P1 and the second branch P2, an adjustment effect is achieved, so that the wastewater recovery rates of the two reverse osmosis filter elements are greatly improved, and the flux of the two reverse osmosis filter elements is greater than 2 times that of a single reverse osmosis filter element under the combined action.

Example ten: see 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 front 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 front water outlet flow is more than or equal to 8L/min, and the kitchen water is not limited and is equal to tap water. The first TDS probe 19a is either before the wastewater return line, before the pre-filter 17a or after the pre-filter 17 a.

The user opens the drinking water tap: 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 front of the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b to be mixed with the effluent of the large-flux preposed filter element 17a, and then enters the two reverse osmosis filter elements again for secondary filtration, so that zero discharge of the wastewater is realized.

The user opens the tap water: the second high-pressure switch 16b detects the pressure change, and opens the first flow limiting valve 14a and the second flow limiting valve 14b, and at the moment, the two reverse osmosis filter elements do not produce 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 two reverse osmosis filter element waste water ends 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 path 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 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 wastewater discharge procedure 1: when the user got the drinking water, because the waste water backward flow, the play water TDS can increase along with the increase of water intaking time, consequently, when first TDS probe 19a and second TDS probe 19b detected that the system desalination is less than the setting value (preferred 70-95%), start the straight row procedure of waste water (preferred 5-300s of time), booster pump 12 keeps starting, keeps normal system water state promptly, first ooff valve 18a and second ooff valve 18b open, the waste water that two reverse osmosis filter core produced is discharged along with the straight row pipeline of waste water, the initial level can be resumeed to play water TDS short time, and it is less to drinking water flux influence.

Example eleven: see fig. 11. In this embodiment, on the basis of the ninth embodiment, a post-filter element 17b is added to a pure water outlet converging pipeline of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, in front of the second one-way valve 15b and the high-pressure switch 16 a; the kind of the post-filter 17b may be activated carbon of different forms. The second TDS probe 19b can be arranged behind the first reverse osmosis filter element 11a and in front of or behind the post-filter element 17b, the high-voltage switch 16a or the second one-way valve 15 b.

The user opens the drinking water tap: when the first high-voltage switch 16a detects the pressure change, the booster pump 12 is started to start water production; tap water respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, and is filtered, then the pure water pipelines of the two reverse osmosis filter elements are converged, and the filtered pure water is discharged by the post filter element 17b through 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 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 opens the tap water: the second high-pressure switch 16b detects the pressure change, and opens the first flow limiting valve 14a and the second flow limiting valve 14b, and at the moment, the two reverse osmosis filter elements do not produce 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 two reverse osmosis filter element waste water ends 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 path 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 tap water faucet for domestic water use, 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 use, and the waste water utilization is realized in a real sense.

Example twelve: see fig. 12. In the embodiment, on the basis of the ninth 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 converging pipeline of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b and in front of the second one-way valve 15b and the high-pressure switch 16 a; 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 preposed effluent flow 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 first TDS probe 19a is arranged in front of the wastewater return line and the front filter element 17a or behind the front filter element 17 a; the second TDS probe 19b can be either behind the first reverse osmosis filter element 11a, before or after the post filter element 17b, the high pressure switch 16a, or the second one-way valve 15 b.

The user opens the drinking water tap: starting the booster pump 12 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.

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 pre-filter 17a or the intersection of the flow path where the pump inlet 121 is located and the first branch P1 and the pre-filter 17a, and the inflow 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. The utility model provides a waterway system with two TDS probes, includes booster pump, first reverse osmosis filter core and drinking water play water subassembly, the drinking water goes out the water subassembly and has the drinking water inlet, and with the drinking water outlet that the drinking water inlet can switch on and the separation, the water inlet of first reverse osmosis filter core with the water inlet intercommunication of booster pump, the delivery port of first reverse osmosis filter core through first plain water pipeline with drinking water inlet intercommunication, its characterized in that still includes:

the domestic water outlet assembly is provided with a domestic water inlet communicated with the wastewater port of the first reverse osmosis filter element and a domestic water outlet which can be communicated and blocked with the domestic water inlet;

a first wastewater direct discharge pipeline, one end of which is communicated with a pipeline between the wastewater inlet of the first reverse osmosis filter element and the domestic water inlet, wherein a first flow limiting valve and a first switch valve are sequentially arranged on a flow path from the upstream to the downstream of the first wastewater direct discharge pipeline, and the first flow limiting valve has a flow limiting state and a full-open state;

a pipeline between the first flow limiting valve and the first switch valve is communicated with a water inlet of the booster pump through the first branch, and a first one-way valve facing the water inlet of the booster pump is arranged on the first branch;

the first high-pressure valve assembly and the second high-pressure valve assembly are respectively and correspondingly arranged between the water outlet of the first reverse osmosis filter element and the drinking water inlet and between the waste water inlet of the first reverse osmosis filter element and the domestic water inlet;

the first TDS probe and the second TDS probe are respectively and correspondingly arranged at the upstream of the booster pump and between the first reverse osmosis filter element and the first high-pressure valve assembly;

and the electric control unit is connected with the booster pump, the first high-pressure valve assembly, the second high-pressure valve assembly, the first flow limiting valve, the first switch valve, the first TDS probe and the second TDS probe.

2. The waterway system with the dual TDS probe of claim 1, further comprising a second reverse osmosis filter element disposed on the flow path between the waste water outlet of the first reverse osmosis filter element and the first flow restriction valve, wherein the water inlet of the second reverse osmosis filter element is communicated with the waste water outlet of the first reverse osmosis filter element, the waste water outlet of the second reverse osmosis filter element is communicated with the water inlet of the first flow restriction valve, and the water outlet of the second reverse osmosis filter element is communicated with the first purified water line through a second purified water line and is located upstream of the second TDS probe.

3. The waterway system with the double TDS probes as recited in claim 2, further comprising a second reverse osmosis filter element, wherein a water inlet of the second reverse osmosis filter element is connected to a water outlet of the booster pump, a waste water outlet of the second reverse osmosis filter element is connected to one end of a second waste water straight discharge pipeline, and a second flow limiting valve and a second switch valve are disposed on the second waste water straight discharge pipeline; the second switch valve is located at the downstream of the second flow limiting valve, a flow path between the second switch valve and the second flow limiting valve is communicated with the pump inlet through a second branch path, and a fourth one-way valve flowing towards the water inlet of the booster pump is arranged on the second branch path.

4. The waterway system with dual TDS probe of any of claims 1-3, further comprising a pre-filter positioned between the booster pump and the first TDS probe.

5. The waterway system with dual TDS probes of claim 4, wherein a feed valve is disposed upstream of the pre-filter or between the pre-filter and the junction of the first branch and the flow path where the pump inlet is located.

6. The waterway system of claim 4, the waterway system with dual TDS probes further comprising a post-filter disposed on the first plain water line upstream of the second TDS probe.

7. The waterway system of claim 6, wherein the outlet flow rate of the pre-filter is greater than or equal to 8L/min.

8. The waterway system of claim 7, wherein the pre-filter is a PP filter, an activated carbon filter, an ultrafiltration filter, or a nanofiltration filter; the post-positioned filter element is an activated carbon filter element.

9. The waterway system with dual TDS probe of any of claims 1-3, further comprising a post-filter disposed on the first pure water line upstream of the second TDS probe.

10. The waterway system of any of claims 1-3, wherein the first high pressure valve comprises a first high pressure switch and a second one-way valve, the second one-way valve being located upstream of the first high pressure switch; the second high pressure valve assembly includes a second high pressure switch and a third one-way valve located upstream of the second high pressure switch.

11. The waterway system of any one of claims 1-3, wherein the waterway system of the dual TDS probe has a preset salt rejection rate of 70% to 95%.