CN114262020A

CN114262020A - Water purifier

Info

Publication number: CN114262020A
Application number: CN202111645329.XA
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: 2022-04-01

Abstract

The invention discloses a water purifier, wherein, the water purifier reflows the waste water to a reverse osmosis filter element through a pipeline, and the waste water is mixed with tap water and then enters the reverse osmosis filter element again for secondary filtration, so that the discharge of the waste water can be greatly reduced while the performance and the service life of the reverse osmosis filter element are ensured; simultaneously, the wastewater is connected with the domestic water outlet assembly, wastewater discharge is completed when the domestic water outlet assembly is opened, and the wastewater is secondarily utilized to meet the requirements of ecological environment protection.

Description

Water purifier

Technical Field

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

Background

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

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

Disclosure of Invention

The application mainly aims to provide a water purifier, and aims to solve the problem that the excessive waste water generated by the existing water purifier is not beneficial to resource utilization.

To achieve the above object, the present invention provides a water purifier 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 intelligent water outlet assembly 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, the domestic water inlet is communicated with the first wastewater outlet, and the intelligent water outlet assembly is electrically connected with the booster pump;

the first flow limiting valve is arranged on the first wastewater straight-discharge pipeline, has a flow limiting effect and has a flow limiting state and a full-open state;

a first on-off valve provided on the first wastewater straight line and located downstream of the first flow restriction valve, a flow path between the first on-off valve and the first flow restriction valve communicating with the pump inlet through a first branch line;

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

the intelligent water outlet assembly is electrically connected with the booster pump, the first flow limiting valve and the first switch valve, when the drinking water inlet is communicated with the water outlet, the booster pump is started, the first flow limiting valve is in a flow limiting state, the first switch valve is closed, and when the time for communicating the drinking water inlet with the water outlet exceeds a first preset time length, the first flow limiting valve keeps in the flow limiting state, and the first switch valve is opened;

when the domestic water inlet is communicated with the water outlet, the booster pump is powered off, the first flow limiting valve is in a flow limiting state, and the first switch valve is in a closed state;

in one embodiment, when the time that the intelligent water outlet assembly is not opened exceeds a second preset time, the first flow limiting valve is opened in a fully opened state, and the first switch valve is opened.

In an embodiment, the water purifier 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 communicating with the first waste water port, the second waste water port communicating with the water inlet end of the first flow limiting valve, and the second water outlet communicating with the drinking water inlet.

In one embodiment, the water purifier further comprises a second reverse osmosis filter element, 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 second switch valve are arranged on the second waste water direct discharge pipeline, the second flow limiting valve has a flow limiting effect, the flow direction of the second flow limiting valve flows from the second waste water outlet to the other end of the second waste water direct discharge pipeline, and the second flow limiting valve has a flow limiting state and a full-open state; the second switch valve is positioned 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, a second one-way valve is arranged on the second branch, and the flow direction of the second 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 flow limiting valve is in a flow limiting state, the second switch valve is closed, and when the time for communicating the drinking water inlet with the water outlet exceeds the first preset time length, the second flow limiting valve keeps the flow limiting state, and the second switch valve is opened;

when the domestic water inlet is communicated with the water outlet, the second flow limiting valve is in a flow limiting state, and the second switch valve is in a closed state;

when the time that the intelligent water outlet assembly is not opened exceeds the second preset time length, the second flow limiting valve is opened in a fully open state, and the second switch valve is opened.

In one embodiment, the water purifier further comprises a pre-filter element, the pre-filter element is arranged at the upstream of the booster pump, and the water outlet end of the first one-way valve is communicated with the pump inlet.

In one embodiment, the water purifier further includes a post-filter disposed on a flow path between the first reverse osmosis filter and the drinking water inlet.

In one embodiment, the water yield of the preposed filter element is less than 8L/min.

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

In one embodiment, the 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 application provides a high water saving system of reverse osmosis of collocation mechanical faucet, before passing through the pipeline backward flow to first reverse osmosis filter core with waste water, reentrant first reverse osmosis filter core carries out the secondary filter after mixing with the running water. The method can greatly reduce the discharge of waste water while ensuring the performance and the service life of the first reverse osmosis filter element; meanwhile, the wastewater is connected with the domestic faucet, the wastewater discharge is completed when the domestic faucet is opened, and the wastewater is secondarily utilized, so that the requirements of ecological environment protection are met. In addition, a first waste water direct discharge pipeline is arranged, and can be used for directly discharging waste water when necessary.

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 view of a first embodiment of a waterway system of a water purifier according to the present application;

FIG. 2 is a schematic view of a flow path of a waterway system of a water purifier according to a second embodiment of the present application;

FIG. 3 is a schematic view of a third embodiment of a waterway system of a water purifier according to the present application;

FIG. 4 is a schematic view of a fourth embodiment of a waterway system of a water purifier according to the present application;

FIG. 5 is a schematic view of a fifth embodiment of a flow path of a waterway system in a water purifier according to the present application;

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

FIG. 7 is a schematic view of a flow path of a waterway system of a water purifier according to a seventh embodiment of the present application;

FIG. 8 is a schematic view of a flow path of an eighth embodiment of a waterway system in a water purifier according to the present application;

FIG. 9 is a schematic view of a ninth embodiment of a waterway system in a water purifier according to the present application;

FIG. 10 is a schematic view of a tenth embodiment of a waterway system of a water purifier according to the present application;

FIG. 11 is a schematic view of a flow path of an eleventh embodiment of a waterway system in a water purifier according to the present application;

fig. 12 is a schematic view of a flow path of a water circuit system in a water purifier according to a twelfth embodiment of the present invention.

The reference numbers illustrate:

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

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 application provides a water purifier.

A water purifier, comprising: the water purifier comprises a first reverse osmosis filter element 11a, a booster pump 12, an intelligent water outlet assembly 13, a first one-way valve 15a, a first flow limiting valve 14a and a first switch valve 18 a. The first reverse osmosis cartridge 11a has a first water inlet 111, a first water outlet 112 and a first waste water outlet 113. The booster pump 12 has a pump inlet 121 and a pump outlet 122, the pump inlet 121 is used for communicating with a water source, the pump outlet 122 is communicated with the first water inlet 111, the first waste water outlet 113 is communicated with the first waste water direct discharging pipeline Q₁One end of which is communicated. The intelligent water outlet assembly 13 is provided with a water outlet 133, a drinking water inlet 131 and a domestic water inlet 132; the drinking water inlet 131 is communicated with the first water outlet 112, the domestic water inlet 132 is communicated with the first waste water inlet 113, and the intelligent water outlet assembly 13 is electrically connected with the booster pump 12. First of allThe flow limiting valve 14a is arranged on the first wastewater direct drainage pipeline Q₁The first flow restriction valve 14a has a flow restriction function. The first switch valve 18a is arranged on the first wastewater direct discharge pipeline Q₁And the first opening and closing valve 18a is located downstream of the first flow limiting valve 14a, the flow path between the first opening and closing valve 18a and the first flow limiting valve 14a passes through the first branch passage P₁Communicating with the pump inlet 121. The first check valve 15a is disposed in the first branch P₁The first check valve 15a flows from the first waste water port 113 to the pump inlet 121. Wherein, when the drinking water inlet and the water outlet 133 are conducted, the booster pump 12 is turned on, the first flow limiting valve 14a is in a flow limiting state, the first switching valve 18a is closed, and when the drinking water inlet and the water outlet 133 are conducted for a time period exceeding a first preset time period (preferably 1-5min), the first flow limiting valve 14a maintains the flow limiting state, and the first switching valve 18a is opened. When the time that the intelligent water outlet assembly 13 is not opened exceeds a second preset time (preferably 10min-10h), the first flow limiting valve 14a is opened in a fully open state, and the first switch valve 18a is opened.

The application provides a high water saving system of reverse osmosis of collocation mechanical faucet, before passing through the pipeline backward flow to first reverse osmosis filter core 11a with waste water, mix the back with the running water and get into first reverse osmosis filter core 11a once more and carry out the secondary filter. The method can greatly reduce the discharge of waste water while ensuring the performance and the service life of the first reverse osmosis filter element 11 a; meanwhile, the wastewater is connected with the domestic faucet, so that the wastewater discharge is completed when the domestic faucet is opened, and the wastewater is recycled, thereby meeting the requirements of ecological environment protection. In addition, a first wastewater direct discharge pipeline Q is also arranged₁And can be used for directly discharging waste water when necessary.

When a user opens a living water tap (the living water inlet 132 is communicated with the water outlet 133), tap water with lower ion concentration can replace the waste water with high ion concentration accumulated at the waste water side of the first reverse osmosis filter element 11a, so that the problem of the first cup of water is effectively solved; moreover, as the domestic water flow is large, when passing through the first reverse osmosis filter element 11a, the water can flush out pollutants such as scale and organic matters deposited on the side surface of the wastewater of the first reverse osmosis filter element 11a, so that the scaling risk of the first reverse osmosis filter element 11a is reduced, and the service life of the first reverse osmosis filter element 11a is prolonged; while the process can be applied to the firstWaste water direct discharging pipeline Q₁And the first flow limiting valve 14a is flushed, 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 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 first preset time is preferably 1-5min), a wastewater direct discharging program is started (the time is preferably 5-300s), at the moment, water is taken and wastewater is discharged at the same time, the initial level of the discharged water TDS can be recovered in a short time, and the influence on the drinking water flow is weak.

The application provides a high water saving system of reverse osmosis of collocation intelligence tap. And the wastewater generated by the first reverse osmosis filter element 11a in the water purification process flows back to the front of the first reverse osmosis filter element 11a through a pipeline, is mixed with tap water and then enters the first reverse osmosis filter element 11a again for secondary filtration. Please refer to table one, after the water purifier continuously operates for 15min, the TDS of the effluent is no longer significantly increased (the TDS of the raw water is 140ppm), and after the water purifier continuously operates for 30min, the TDS of the effluent is 46ppm, which still meets the drinking water standard.

Table-wastewater recirculation system operating data

Besides the first reverse osmosis filter element 11a wastewater flows back to the front of the first reverse osmosis filter element 11a through the return pipeline, the system also connects the first reverse osmosis filter element 11a wastewater 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 water outlet 133) by a user, the wastewater is discharged for the life of the user, the secondary utilization of the wastewater is completed, and the requirement of ecological environmental protection is met. In addition, a first wastewater direct discharge pipeline Q is also arranged₁And can be used for directly discharging waste water when necessary.

The first embodiment is as follows: please refer to fig. 1. The intelligent double-water faucet is added into the wastewater backflow system, and the intelligent faucet can complete electric control on other components in the system through the change of the opening/closing state of the intelligent faucet.

The water purifier in this embodiment includes: the water purifier comprises a first reverse osmosis filter element 11a, a booster pump 12, an intelligent water outlet assembly 13, a first one-way valve 15a, a first flow limiting valve 14a and a first switch valve 18 a. 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 intelligent water outlet assembly 13 is provided with a water outlet 133, a drinking water inlet 131 and a domestic water inlet 132; the drinking water inlet 131 is communicated with the first water outlet 112, the domestic water inlet 132 is communicated with the first waste water inlet 113, and the intelligent water outlet assembly 13 is electrically connected with the booster pump 12; the first flow limiting valve 14a is arranged on the first wastewater direct drainage pipeline Q₁The first flow limiting valve 14a has a flow limiting state and a fully open state (in the flow limiting state, the flow is small, and the flow may be 5% to 80% in the fully open state, and preferably, the flow may be 10% to 30% in the fully open state); the first switch valve 18a is arranged on the first wastewater direct discharge pipeline Q₁And the first opening and closing valve 18a is located downstream of the first flow limiting valve 14a, the flow path between the first opening and closing valve 18a and the first flow limiting valve 14a passes through the first branch passage P₁Communicates with the pump inlet 121; the first check valve 15a is disposed in the first branch P₁The first check valve 15a flows from the first waste water port 113 to the pump inlet 121. When the drinking water inlet and the water outlet 133 are communicated, the booster pump 12 is started, the first flow limiting valve 14a is in a flow limiting state, the first switch valve 18a is closed, and when the time for communicating the drinking water inlet and the water outlet 133 exceeds a first preset time (preferably 1-5min), the first flow limiting valve 14a keeps the flow limiting state, and the first switch valve 18a is opened; when the time that the intelligent water outlet assembly 13 is not opened exceeds a second preset time (preferably 10min-10h), the first flow limiting valve 14a is opened in a fully open state, and the first switch valve 18a is opened.

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

The user turns on the life tap (the life water inlet 132 is communicated with the water outlet 133): tap water enters the first reverse osmosis filter element 11a through the booster pump 12 (the pump is not started) and then flows out of the waste water side of the first reverse osmosis filter element 11a in two ways, one way is high in flow rate and is directly discharged through a domestic water faucet, and the other way flows back to the booster pump 12 through the first flow limiting valve 14a (flow limiting and low in flow rate) and then enters the first reverse osmosis filter element 11a again to flush the waste water side of the first reverse osmosis filter element 11a after being mixed with the tap water. That is, when the user opens the living water faucet (the living water inlet 132 is communicated with the water outlet 133), the tap water with lower ion concentration can replace the waste water with high ion concentration accumulated on the waste water side of the first reverse osmosis filter element 11a, thereby effectively solving the problem of the first cup of water. Moreover, as the 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.

Wastewater straight-line procedure 1: when a user takes drinking water, because the waste water flows back, the TDS of the outlet water is increased along with the increase of the water taking time, therefore, after the drinking water taking time of the user reaches a certain value (the first preset time is preferably 1-5min), the waste water direct discharging program is started (the time is preferably 5-300s), at the moment, the waste water is taken and discharged at the same time, the booster pump 12 is kept started, namely, the normal water making state is kept, the first switch valve 18a is opened, the waste water generated by the first reverse osmosis filter element 11a is directly discharged along with the first waste water direct discharging pipeline Q₁Discharging and discharging waterTDS can restore the initial level in a short time, and has weak influence on the flow of drinking water.

Wastewater straight-line procedure 2: when the situation that the user does not use the water purifier (the intelligent water outlet assembly 13 is not started) for a long time (the second preset time is preferably 10min-10h) is monitored, starting the wastewater direct discharging program 2 (the time is preferably 5-300s), and only discharging wastewater at the moment; the booster pump 12 is not started, the first flow limiting valve 14a and the first switch valve 18a are opened, and tap water flows out from the wastewater side after entering the first reverse osmosis filter element 11a depending on the pressure of the tap water and is directly discharged into the first wastewater direct discharge pipeline Q₁And the replacement of water in the first reverse osmosis filter element 11a and the first waste water pipeline Q1 is completed, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under normal conditions, the user opens the life tap (domestic water inlet 132 and outlet 133 switch on) 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 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: please refer to fig. 2. In this embodiment, a front filter element 17a is added to the front end of the booster pump 12, the type of the front filter element 17a can be PP with different forms, activated carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the above materials, and the like, and the water outlet flow rate of the front filter element 17a is less than 8L/min.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): starting the booster pump 12 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 booster pump 12 through the first flow limiting valve 14a and is mixed with the water discharged by the preposed filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the waste water is realized.

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

Wastewater straight-line procedure 2: when the situation that the user does not use the water purifier (the intelligent water outlet assembly 13 is not started) for a long time (the second preset time is preferably 10min-10h) is monitored, starting the wastewater direct discharging program 2 (the time is preferably 5-300s), and only discharging wastewater at the moment; the booster pump 12 is not started, the first flow limiting valve 14a and the first switching valve 18a are opened, and the running water is relied uponThe tap water flows out from the waste water side after entering the first reverse osmosis filter element 11a and is directly discharged into the first waste water direct discharge pipeline Q₁And the replacement of water in the first reverse osmosis filter element 11a and the first waste water pipeline Q1 is completed, the first reverse osmosis filter element 11a and the first flow limiting valve 14a are prevented from scaling, and the service life of the first reverse osmosis filter element 11a and the first flow limiting valve 14a is prolonged. Under normal conditions, the user opens the life tap (domestic water inlet 132 and outlet 133 switch on) 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 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 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 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): starting the booster pump 12 to start water production; tap water is divided into a path of pure water and a path of waste water after flowing into the first reverse osmosis filter element 11a, the pure water is discharged by a drinking water faucet for drinking after passing through the post-positioned filter element 17b, and the waste water is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and then enters the first reverse osmosis filter element 11a again for filtration, so that zero discharge of the waste water is realized.

Wastewater straight-line procedure 2: when the situation that the user does not use the water purifier (the intelligent water outlet assembly 13 is not started) for a long time (the second preset time is preferably 10min-10h) is monitored, starting the wastewater direct discharging program 2 (the time is preferably 5-300s), and only discharging wastewater at the moment; the booster pump 12 is not started, the first flow limiting valve 14a and the first switch valve 18a are opened, and tap water flows out from the wastewater side after entering the first reverse osmosis filter element 11a depending on the pressure of the tap water and is directly discharged into the first wastewater direct discharge pipeline Q₁And the replacement of water in the first reverse osmosis filter element 11a and the first waste water pipeline Q1 is completed, 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. Normally, the first reverse osmosis filter element 11a and the waste water return line can be flushed by opening the life tap (the life water inlet 132 is communicated with the water outlet 133) by the user, and the procedure is mainly used for avoiding the current useAfter drinking water is taken by a user, no domestic water is needed, so that the backflow wastewater is retained in the first reverse osmosis filter element 11a and the backflow pipeline for a long time, and the problem of influence on the service life due to scale deposit is caused.

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 11 a; the type of the preposed filter element 17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, and the water outlet flow of the preposed filter element 17a is less than 8L/min; the kind of the post-filter 17b may be activated carbon of different forms.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): starting the booster pump 12 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 booster pump 12 through the first flow limiting valve 14a and is mixed with the water discharged by the front filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, so that zero discharge of the wastewater is realized.

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 inlet 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 inlet 116, the second water inlet 114 is communicated with the first waste water inlet 113, the second waste water inlet 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 drinking water inlet 131.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): starting the booster pump 12 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 to the drinking water inlet 131, the wastewater flows into the second reverse osmosis filter element 11b and is divided into a path of pure water and a path of wastewater after secondary filtration, the pure water flows to the drinking water inlet 131 and is converged with water flow from the first water outlet 112, the pure water is discharged through the drinking water faucet for drinking, the wastewater is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and then enters the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

The user turns on the life tap (the life water inlet 132 is communicated with the water outlet 133): tap water enters the first reverse osmosis filter element 11a through the booster pump 12 (the pump is not started), then flows out from the wastewater side of the first reverse osmosis filter element 11a, enters the second reverse osmosis filter element 11b, then flows out from the wastewater side of the second reverse osmosis filter element 11b in two ways, one way of the tap water is directly discharged through a domestic water faucet, the other way of the tap water flows back to the booster pump 12 through the first flow limiting valve 14a (with flow limitation and small flow), is mixed with the tap water, and then enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b again to flush the wastewater sides of the two reverse osmosis filter elements; namely, when a user opens a living water tap (the living water inlet 132 is communicated with the water outlet 133), tap water with lower ion concentration can replace the wastewater with high ion concentration accumulated at the wastewater side of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, so that the problem of the first cup of water is effectively solved; moreover, as the domestic water flow is large, when passing through the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, pollutants such as scale and organic matters deposited on the side surfaces of the wastewater of the two reverse osmosis filter elements can be washed away, the scaling risk of the two reverse osmosis filter elements is reduced, and the service lives of the two reverse osmosis filter elements are prolonged; meanwhile, the process can flush the wastewater 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.

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

Wastewater straight-line procedure 2: when the situation that the user does not use the water purifier (the intelligent water outlet assembly 13 is not started) for a long time (the second preset time is preferably 10min-10h) is monitored, starting the wastewater direct discharging program 2 (the time is preferably 5-300s), and only discharging wastewater at the moment; the booster pump 12 is not started, the first flow limiting valve 14a and the first switch valve 18a are opened, and tap water flows out from the wastewater side after entering the two reverse osmosis filter elements depending on the pressure of the tap water and is directly discharged into the first wastewater direct discharge pipeline Q₁And the replacement of water in the two reverse osmosis filter elements and the first waste water pipeline Q1 is completed, the two reverse osmosis filter elements and the first flow limiting valve 14a are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the first flow limiting valve 14a are prolonged. Under normal conditions, the user opens life tap (domestic water inlet 132 switches on with outlet 133) and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use domestic water needs again after the user has got the drinking water, makes backward flow waste water be detained for a long time in two reverse osmosis filter cores and return line, causes the 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 can be PP with different forms, activated carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the above materials, and the like, and the water outlet flow rate of the front filter element 17a is less than 8L/min.

The user turns on the drinking water tap (the drinking water inlet 131 is communicated with the water outlet 133): starting the booster pump 12 to start water production; tap water flows into the first reverse osmosis filter element 11a after being roughly filtered by the preposed filter element 17a, is divided into one path of pure water and one path of wastewater, the pure water flows to the drinking water inlet 131, 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 being secondarily filtered, the pure water flows to the drinking water inlet 131 and is converged with water flow from the first water outlet 112, the pure water is discharged for drinking through the drinking water faucet, the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and then is mixed with the water discharged from the preposed filter element 17a to enter the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

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 reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, 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): starting the booster pump 12 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 to the drinking water inlet 131, the wastewater flows into the second reverse osmosis filter element 11b and is divided into a path of pure water and a path of wastewater after secondary filtration, the pure water flows to the drinking water inlet 131 and is converged with water flow from the first water outlet 112, the pure water is discharged by a drinking water faucet for drinking after passing through the post-positioned filter element 17b, the wastewater is mixed with the tap water before flowing back to the booster pump 12 through the first flow limiting valve 14a and then enters the first reverse osmosis filter element 11a again for secondary filtration, and zero discharge of the wastewater is realized.

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

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

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. First, theThe two reverse osmosis filter elements 11b are provided with a second water inlet 114, a second water outlet 115 and a second waste water outlet 116, the second water inlet 114 is communicated with the pump outlet 122, and the second waste water outlet 116 and a second waste water direct discharge pipeline Q₂Is communicated with the first waste water direct discharge pipeline Q₂A second flow limiting valve 14b and a second switch valve 18b are arranged on the waste water direct discharge pipeline Q, the second flow limiting valve 14b has the flow limiting function, and the flow direction of the second flow limiting valve 14b flows from the second waste water outlet to the second waste water direct discharge pipeline Q₂The second flow restriction valve 14b has a flow restriction state and a fully open state; a second switching valve 18b is located downstream of the second flow limiting valve 14b, and a flow path between the second switching valve 18b and the second flow limiting valve 14b passes through the second branch passage P₂In communication with the pump inlet 121, a second branch P₂A second check valve 15b is provided, and the flow direction of the second check valve 15b flows from the second waste water port 116 to the pump inlet 121. When the drinking water inlet and the drain port 133 are conducted, the second flow limiting valve 14b is in a flow limiting state, the second switching valve 18b is closed, and when the drinking water inlet and the drain port 133 are conducted for a time exceeding a first preset time period, the second flow limiting valve 14b maintains the flow limiting state, and the first switching valve 18a is opened. When the domestic water inlet and the drain port 133 are communicated, the second flow restriction valve 14b is in the flow restriction state, and the second opening and closing valve 18b is in the closed state. When the time that the intelligent water outlet assembly 13 is not opened exceeds a second preset time, the second flow limiting valve 14b is opened in a fully open state, and the second switch valve 18b is opened.

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

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

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 water TDS, consequently, after the user got the drinking water time and reached a definite value (first preset duration preferred 1-5min), start the straight row procedure of waste water (time preferred 5-300s), it is the waste water of discharging simultaneously to get water this moment, booster pump 12 keeps starting, keep normal system water state promptly, first ooff valve 18a and second ooff valve 18b open, the waste water that two reverse osmosis filter cores produced is discharged along with two waste water straight-line pipelines, it can resume initial level in the play water TDS short time, and it is weak to drinking water flow influence.

Wastewater straight-line procedure 2: when the situation that the user does not use the water purifier (the intelligent water outlet assembly 13 is not started) for a long time (the second preset time is preferably 10min-10h) is monitored, starting the wastewater direct discharging program 2 (the time is preferably 5-300s), and only discharging wastewater at the moment; 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 all opened, tap water flows out from the wastewater side after entering the two reverse osmosis filter elements by means of the pressure of tap water and is directly discharged into the two wastewater direct discharge pipelines, the replacement of water in the two reverse osmosis filter elements and the wastewater pipelines is completed, the two reverse osmosis filter elements and the two flow limiting valves are prevented from scaling, and the service lives of the two reverse osmosis filter elements and the two flow limiting valves are prolonged. Under normal conditions, the user opens life tap (domestic water inlet 132 switches on with outlet 133) and can accomplish the washing to two reverse osmosis filter cores and waste water return line, and this procedure mainly used avoids having no use domestic water needs again after the user has got the drinking water, makes backward flow waste water be detained for a long time in two reverse osmosis filter cores and return line, causes the incrustation scale deposit and influences life's problem.

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

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

Example eleven: please refer to fig. 11. In this embodiment, on the basis of the ninth embodiment, a post-filter element 17b is added to the pure water outlet merging pipeline of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11 b; 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): starting the booster pump 12 to start water production; running water respectively enters the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11b, is filtered and then is converged, and is discharged by a drinking water tap for drinking after passing through the post-positioned filter element 17 b; the wastewater flows back to the booster pump 12 through the first flow limiting valve 14a and the second flow limiting valve 14b, is mixed with tap water and then enters the two reverse osmosis filter elements again for secondary filtration, and zero discharge of the wastewater is realized.

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 merging pipeline of the first reverse osmosis filter element 11a and the second reverse osmosis filter element 11 b; the type of the preposed filter element 17a can be PP with different forms, active carbon with different forms, ultrafiltration, nanofiltration, composite filter elements made of the materials and the like, and the water outlet flow of the preposed filter element 17a is less than 8L/min; the kind of the post-filter 17b may be activated carbon of different forms.

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

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. A water purifier, characterized by comprising:

a first reverse osmosis filter element having a first water inlet, a first water outlet, and a first waste water outlet;

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

the electric control unit is electrically connected with the intelligent water outlet assembly, the first flow limiting valve and the first switch valve; when the drinking water inlet is communicated with the water outlet, the booster pump is started, the first flow limiting valve is controlled to be in a flow limiting state, and the first switch valve is closed;

when the conduction time of the drinking water inlet and the water outlet exceeds a first preset time length, the first flow limiting valve is kept in a flow limiting state, and the first switch valve is opened;

when the domestic water inlet is communicated with the water outlet, the booster pump is controlled to stop running, the first flow limiting valve is controlled to keep a flow limiting state, and the first switch valve is closed.

2. The water purifier of claim 1, wherein when the intelligent water outlet assembly is not opened for more than a second preset time period, the first flow limiting valve is opened in a fully open state and the first switch valve is opened.

3. The water purifier of claim 2, further comprising a second reverse osmosis filter element disposed in the flow path between the first waste water port and the first flow restriction valve, the second reverse osmosis filter element having a second water inlet in communication with the first waste water port, a second water outlet in communication with the water inlet end of the first flow restriction valve, and a second waste water port in communication with the potable water inlet.

4. The water purifier as recited in claim 3, further comprising a second reverse osmosis filter element having a second water inlet, a second water outlet and a second waste water outlet, said second water inlet being in communication with said pump outlet, said second waste water outlet being in communication with one end of a second waste water straight discharge line, said second waste water straight discharge line being provided with a second flow restriction valve having a flow restriction function, said second flow restriction valve having a flow restriction function, a flow direction from said second waste water outlet to the other end of said second waste water straight discharge line, said second flow restriction valve having a flow restriction state and a fully opened state; the second switch valve is positioned 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, a second one-way valve is arranged on the second branch, and the flow direction of the second one-way valve flows from the second waste water port to the pump inlet;

5. The water purifier of any one of claims 1 to 4, further comprising a pre-filter disposed upstream of the booster pump, the water outlet end of the first one-way valve communicating with the pump inlet.

6. The water purifier of claim 5, further comprising a post-filter element disposed in a flow path between the first reverse osmosis filter element and the potable water inlet.

7. The water purifier of claim 6, wherein the pre-filter element has a water yield of less than 8L/min.

8. The water purifier of claim 7, wherein a water inlet valve is provided upstream of the pre-filter element or between the pre-filter element and a location where the pump inlet is located at the intersection of the flow path and the first branch.

9. The water purifier of claim 7, 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.

10. The water purifier of any one of claims 1 to 4, further comprising a post-filter disposed on a flow path between the first reverse osmosis filter and the drinking water inlet.