CN117342722A

CN117342722A - Water purification system

Info

Publication number: CN117342722A
Application number: CN202311292004.7A
Authority: CN
Inventors: 张可可; 李友铃; 周曌; 张量; 侯桂林; 王翔北
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-10-07
Filing date: 2023-10-07
Publication date: 2024-01-05

Abstract

The invention relates to the technical field of water purification, and discloses a water purification system, which comprises: the water making device comprises a water making pipeline, a front filter element and a rear filter element which are sequentially connected to the water making pipeline in series; the water storage device comprises a heating device; a back flushing pipeline; when the water purification system executes a first back flushing mode, hot water sequentially flows through the connecting pipeline, the front filter element water outlet, the front filter element water inlet and the first drainage pipeline; when the water purification system executes the second back flushing mode, water in the water storage device flows to the water outlet of the rear filter element, the water inlet of the rear filter element and the first water drainage pipeline in sequence through the reversing structure.

Description

Water purification system

Technical Field

The invention relates to the technical field of water purification, in particular to a water purification system.

Background

The tap water is inevitably polluted by rust, sediment, organic matters, microorganisms and the like in the pipeline network conveying process. With the attention of people on water quality safety, water purifiers with purification functions are gradually accepted by markets. The water purification system of the water purifier generally comprises a pretreatment filter element, a precise filter element and a post-treatment filter element, wherein the pretreatment filter element is used for removing organic matters, colloid, heavy metals, sediment particles and the like; the precision of the precise filter element is extremely high, for example, a reverse osmosis membrane filter element is a core treatment filter element of a water purification system; the post-treatment filter element is used for removing trace elements, adjusting pH, drinking taste and the like. Because the active carbon can effectively remove the oxidative substances such as residual chlorine which causes damage to the RO filter element of the precise filter element, the active carbon filter element is an indispensable important component in the pretreatment filter element of the water purifier, but the active carbon filter element has shorter service life compared with other filter elements, and not only needs frequent core replacement, but also limits the nominal value of the rated water purifying amount of the whole water purifier.

Disclosure of Invention

In view of the above, the invention provides a water purification system to solve the problems of short service life and frequent replacement of an activated carbon filter element.

The present invention provides a water purification system, comprising:

the water making device comprises a water making pipeline, and a front filter element and a rear filter element which are sequentially connected in series to the water making pipeline, wherein the front filter element and the rear filter element comprise a carbon water purifying unit, the front filter element is provided with a front filter element water inlet and a front filter element water outlet, and the rear filter element is provided with a rear filter element water inlet and a rear filter element water outlet;

the water storage device comprises a heating device, the water storage device is communicated with the water outlet of the rear filter element through a water outlet pipeline, and the water outlet pipeline is provided with a reversing structure;

the back flushing pipeline comprises a connecting pipeline connected in parallel between the water inlet of the pre-filter element and the water outlet of the pre-filter element, and a first drainage pipeline which is respectively communicated with the water inlet of the pre-filter element and the water inlet of the post-filter element;

when the water purification system executes a first back flushing mode, hot water sequentially flows through the connecting pipeline, the front filter element water outlet, the front filter element water inlet and the first drainage pipeline, and water in the water storage device sequentially flows to the rear filter element water outlet, the rear filter element water inlet and the first drainage pipeline through the reversing structure;

When the water purification system executes a second back flushing mode, hot water in the water storage device flows to the water outlet of the rear filter element, the water inlet of the rear filter element and the first drainage pipeline in sequence through the reversing structure.

The beneficial effects are that: when the water purification system normally produces water, tap water flows along the water production pipeline to produce water and finally flows to the water storage device, the tap water is stored in the water storage device for users, and the water storage device comprises the heating device, so that the tap water can be heated to the temperature required by the users for the users to use. After the front filter element is used for a period of time, more impurities are adsorbed, the water purification system is switched to a first back flushing mode, and the front filter element can be back flushed. The charcoal water purification unit comprises active carbon, when the water purification system is in a first back flush mode, hot water sequentially flows through a connecting pipeline, a water outlet of the front filter element, a water inlet of the front filter element and a first drainage pipeline, the front filter element is reversely flushed, the hot water can break the balance between the active carbon and pollutant adsorbates, so that the pollutant is desorbed in an analyzing mode, the impurity adsorbed by the front filter element can be effectively stripped and removed, the adsorption capacity of the active carbon in the front filter element is recovered, the regeneration is realized, and flushing water with the impurity flows out from the inlet of the front filter element and then is discharged from the first drainage pipeline. When the rear filter element is used for a period of time, more impurities are adsorbed, the water purification system is switched to a second back flushing mode, and the rear filter element can be back flushed. When the water purification system is in the second back flush mode, hot water in the water storage device enters the rear filter element from the rear filter element water outlet of the rear filter element after passing through the reversing structure, the rear filter element is reversely flushed, the balance between the activated carbon and the pollutant-adsorbing substances can be broken through by the hot water, the pollutant is desorbed in a resolving mode, and impurities adsorbed by the rear filter element can be effectively stripped and removed, so that part of adsorption capacity of the activated carbon in the rear filter element is recovered, regeneration is realized, and water flow flows out from the rear filter element water inlet and then is discharged from the first drainage pipeline.

Therefore, the water purifying system can reversely flush the front filter element and the rear filter element, prolongs the service lives of the front filter element and the rear filter element, prolongs the replacement period, does not need frequent replacement, has lower cost compared with the related technology, can ensure the safety of water, and is safe and simple for the regeneration process of the carbon water purifying units in the front filter element and the rear filter element.

In an alternative embodiment, the water inlet of the pre-filter element is connected with a water inlet pipeline communicated with a tap water inlet, the water inlet of the pre-filter element is also connected with the first drainage pipeline, and the first drainage pipeline is provided with a first switch valve;

the water making device further comprises a fine filter element, the fine filter element is provided with a fine filter element water inlet, a pure water gap and a waste water port, and the fine filter element water inlet is communicated with the front filter element water outlet through a first pipeline;

the water inlet of the rear filter element is connected with the pure water port through a second pipeline, the second pipeline is provided with a second switch valve, the water inlet of the rear filter element is communicated with the first drainage pipeline through a second drainage pipeline, and the second drainage pipeline is provided with a third switch valve;

the water storage device is provided with a water inlet end and a water outlet end, the water inlet end is connected with the water outlet of the rear filter element through a water outlet pipeline, and the water outlet end is connected with the water outlet pipeline;

The connecting pipeline is connected with the water inlet pipeline and the first pipeline or the water outlet of the front filter element;

the water purification system further comprises a first pipeline switching structure and a second pipeline switching structure, wherein the first pipeline switching structure is provided with a first state for enabling the water inlet pipeline to be communicated with the water inlet of the front filter element and a second state for enabling the water inlet pipeline to be communicated with the connecting pipeline; the second pipeline switching structure is provided with a third state for enabling the water outlet of the pre-filter element to be communicated with the water inlet of the fine filter element and a fourth state for enabling the connecting pipeline to be communicated with the water outlet of the pre-filter element;

the reversing structure is provided with a fifth state for enabling the water outlet of the rear filter element to be communicated with the water inlet end and a sixth state for enabling the water outlet end to be communicated with the water outlet of the rear filter element;

when the water purification system executes a water making mode, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, and the second switch valve is opened;

when the water purification system executes the first back flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the front filter element is reversely flushed, and the water reversely flushed by the front filter element is heated tap water;

When the water purification system executes the second back flushing mode, the reversing structure is in a sixth state, the second switching valve is closed, the rear filter element is reversely flushed, and the water reversely flushed by the rear filter element is heated pure water.

The beneficial effects are that: when the water purification system normally produces water, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, the first switch valve is closed, the second switch valve is opened, the third switch valve is closed, tap water enters the front filter element through the water inlet of the front filter element, after being filtered by the front filter element, flows out of the water outlet of the front filter element, then enters the fine filter element through the first pipeline to be filtered, pure water formed by filtering of the fine filter element flows out of the pure water outlet, flows into the rear filter element through the second pipeline, flows into the water storage device through the water outlet pipeline after being filtered again by the rear filter element, is stored in the water storage device for users, and the water storage device comprises a heating device, so that the water can be heated to be at the temperature required by the users for the users to use. After the front filter element is used for a period of time, more impurities are adsorbed, the water purification system is switched to a first back flushing mode, and the front filter element can be back flushed. When the water purification system is in the first back flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first switch valve is opened. At this time, water flows into the connecting pipeline after entering the water inlet pipeline, enters the front filter element from the front filter element water outlet after passing through the connecting pipeline, and is reversely flushed to the front filter element. When the rear filter element is used for a period of time, more impurities are adsorbed, the water purification system is switched to a second back flushing mode, and the rear filter element can be back flushed. When the water purification system is in the second back flushing mode, the reversing structure is in a sixth state, the second switch valve is closed, the third switch valve is opened, hot water in the water storage device enters the rear filter element from the rear filter element water outlet of the rear filter element after passing through the water outlet pipeline, and the rear filter element is reversely flushed.

Therefore, the water purification system can reversely wash the front filter element and the rear filter element, prolongs the service lives of the front filter element and the rear filter element, does not need frequent replacement, has lower cost compared with the related technology, and can ensure the safety of water.

In an alternative embodiment, the water inlet pipeline is provided with a fourth switch valve, the water purification system further has a soaking mode, and when the water purification system executes the soaking mode, the first switch valve, the second switch valve, the third switch valve and the fourth switch valve are closed.

The beneficial effects are that: when the first back flushing mode and the second back flushing mode are adopted, the second switch valve is always closed, the first pipeline switching structure is in a second state, the second pipeline switching structure is in a fourth state, the reversing structure is in a sixth state, after hot water fully enters the rear filter element and the front filter element, the first switch valve, the third switch valve and the fourth switch valve are closed, at the moment, under the cooperation of the fourth switch valve and the first switch valve, the hot water front filter element is fully soaked, under the action of the third switch valve, the rear filter element is fully soaked, impurities adsorbed by the rear filter element and the front filter element fall off, after soaking for a period of time, the first switch valve, the third switch valve and the fourth switch valve are opened, the rear filter element and the front filter element are reversely flushed by flowing hot water, flushing water reversely flushed by the front filter element is discharged through the first drainage pipeline, and flushing water reversely flushed by the rear filter element is discharged through the second drainage pipeline. The back flushing effect on the rear filter element and the front filter element can be further improved.

In an alternative embodiment, the water purification system further has a first cooling mode and a second cooling mode; when the water purification system executes the first cooling mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the front filter element is reversely flushed, and water reversely flushed by the front filter element is normal-temperature tap water; when the water purification system executes the second cooling mode, the reversing structure is in the fifth state, the rear filter element is reversely flushed, and water reversely flushed by the rear filter element is normal-temperature pure water.

The beneficial effects are that: because the water for back flushing the front filter element and the rear filter element is hot water and the fine filter element is not high temperature resistant usually in the first back flushing mode and the second back flushing mode, after the back flushing mode is finished and before the water preparation mode, the water purification system is switched into a first cooling mode and a second cooling mode, the first pipeline switching structure is in a second state, the second pipeline switching structure is in a fourth state, the reversing structure is in a fifth state, normal-temperature tap water flows into the connecting pipeline and then flows into the front filter element from the water outlet of the front filter element after flowing into the connecting pipeline, the back flushing is carried out on the front filter element, and water flowing out from the water inlet of the front filter element is finally discharged through the first drainage pipeline. After the unheated normal-temperature pure water in the water storage device passes through the water outlet pipeline, the pure water enters the rear filter element from the rear filter element water outlet of the rear filter element, the rear filter element is reversely flushed, and the water flowing out from the rear filter element water inlet is finally discharged through the second water discharge pipeline. Therefore, after the first cooling mode and the second cooling mode, hot water is not arranged in the front filter element, so that the damage to the fine filter element caused by the flow of the hot water to the fine filter element during normal water production can be avoided.

In an alternative embodiment, the water purification system has an operating state in which the first back flush mode and the first cooling mode are alternately operated, and/or the second back flush mode and the second cooling mode are alternately operated.

The beneficial effects are that: by alternating the first backwash mode and the first cooling mode and/or the second backwash mode and the second cooling mode, an optimal regeneration effect can be achieved.

In an alternative embodiment, the connecting line is provided with a heating element.

The beneficial effects are that: the heating component is externally arranged on the front filter element, so that the replacement of the front filter element is not affected.

In an alternative embodiment, the membrane shell of the pre-filter cartridge is provided with a heating member.

The beneficial effects are that: the heating component is arranged with the membrane shell of the front filter element, when the membrane shell is separated from the inner core, the inner core can be replaced only when the filter element is replaced, and when the membrane shell is integrated with the inner core, the whole filter element needs to be replaced when the filter element is replaced.

In an alternative embodiment, the water purification system comprises a water temperature detection element and a controller, wherein the controller is in communication connection with the water temperature detection element and the heating component, the water temperature detection element can detect the temperature of water for back flushing the pre-filter element and the post-filter element in the first back flushing mode and the second back flushing mode, and the controller can adjust the power of the heating component and the heating device according to the temperature of water for back flushing the pre-filter element and the post-filter element.

The beneficial effects are that: the back flushing modes with different temperatures can be realized by adjusting the power of the heating component.

In an alternative embodiment, the water storage device comprises a pure water tank, the pure water tank is provided with a water inlet end and a pure water tank water outlet, the pure water tank water outlet is communicated with a heating water inlet of the heating device, the heating device is provided with a water outlet end, and the water outlet end is communicated with a water intake.

In an alternative embodiment, the first pipeline switching structure comprises a first three-way valve arranged at the connection point of the connecting pipeline and the water inlet pipeline.

The beneficial effects are that: the first pipeline switching structure is a first three-way valve, and the first state that the water inlet pipeline is communicated with the water inlet of the front filter element and the second state that the water inlet pipeline is communicated with the connecting pipeline can be realized by controlling the first three-way valve, so that the structure is simple and the control is convenient.

In an alternative embodiment, the connecting pipeline is connected with the first pipeline, and the second pipeline switching structure comprises a second three-way valve arranged at the connection point of the connecting pipeline and the first pipeline.

The beneficial effects are that: the second pipeline switching structure is a second three-way valve, and a third state that the water outlet of the front filter element is communicated with the water inlet of the fine filter element and a fourth state that the connecting pipeline is communicated with the water outlet of the front filter element can be realized by controlling the second three-way valve, so that the structure is simple and the control is convenient.

In an alternative embodiment, the water outlet end is connected with the water outlet pipeline through a third pipeline, and the reversing structure comprises a third three-way valve arranged at the connection point of the water outlet pipeline and the third pipeline.

The beneficial effects are that: the reversing structure is a third three-way valve, and the fifth state that the water outlet of the rear filter element is communicated with the water inlet end in the forward direction and the sixth state that the water outlet end is communicated with the water outlet of the rear filter element in the reverse direction can be realized by controlling the third three-way valve, so that the reversing structure is simple in structure and convenient to control.

In an alternative embodiment, the water purification system further comprises a coarse filter element, the coarse filter element is provided with a coarse filter element water inlet and a coarse filter element water outlet, the coarse filter element water inlet is communicated with the tap water inlet, and the coarse filter element water outlet is connected with the front filter element water inlet through the water inlet pipeline.

The beneficial effects are that: through setting up the coarse filtration filter core, in the water making mode, tap water is filtered by the coarse filtration filter core and then enters the preposed filter core for filtration; in the back flush mode, tap water is filtered by the coarse filter element and then flows to the front filter element through the connecting pipeline, so that the pollution of impurities in tap water to the front filter element in the back flush mode can be avoided.

In an alternative embodiment, the waste water port is connected with a concentrated water pipeline, the concentrated water pipeline is provided with a waste water electromagnetic valve, and the first drainage pipeline and the second drainage pipeline are communicated with the concentrated water pipeline.

The beneficial effects are that: the flushing water for back flushing the front filter element and the rear filter element is discharged through the concentrated water pipeline, and the structure is simple and compact.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a water purification system according to an embodiment of the present invention when a heating element is externally disposed on a pre-filter element;

FIG. 2 is a schematic view of a water purification system according to an embodiment of the present invention when a heating element is built into a pre-cartridge;

FIG. 3 is a schematic view of the water purification system shown in FIG. 1 in a water-producing mode;

FIG. 4 is a schematic view of the water purification system shown in FIG. 2 in a water-producing mode;

FIG. 5 is a schematic diagram of the water purification system shown in FIG. 1 in a backwash mode;

FIG. 6 is a schematic diagram of the water purification system shown in FIG. 2 in a backwash mode;

FIG. 7 is a schematic diagram of the water purification system shown in FIG. 1 in a cooling mode;

fig. 8 is a schematic view of the water purification system shown in fig. 2 in a cooling mode.

Reference numerals illustrate:

1. a filter element is arranged in front; 101. a water inlet of the filter element is arranged in front; 102. a water outlet of the front filter element; 2. a tap water inlet; 3. a water inlet pipeline; 4. a first drain line; 5. a first switching valve; 6. a fine filter element; 601. a fine filter core water inlet; 602. a pure water port; 603. a waste water port; 7. a first pipeline; 8. a rear filter element; 801. a water inlet of the rear filter element; 802. a water outlet of the rear filter element; 9. a second pipeline; 10. a second switching valve; 11. a second drain line; 12. a third switching valve; 13. a pure water tank; 1301. a water inlet end; 1302. a water outlet of the pure water tank; 14. a heating device; 1401. heating the water inlet; 1402. a water outlet end; 15. a water intake; 16. a connecting pipeline; 17. a fourth switching valve; 18. a heating member; 19. a first three-way valve; 20. a second three-way valve; 21. a third three-way valve; 22. a third pipeline; 23. a coarse filtration filter element; 2301. a water inlet of the coarse filter element; 2302. a water outlet of the coarse filter element; 24. a concentrated water pipeline; 25. a waste water electromagnetic valve; 26. and a booster pump.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In order to achieve the aims of long service life and less core replacement of the filter element of the water purifier, the service life of the carbon filter element is prolonged in the industry mainly by improving the carbon material, manufacturing process and increasing the carbon consumption, the water purifying performance and service life can be improved to a certain extent, but failure points always exist, and a break for improving the service life of the active carbon filter element is necessary to be found.

Through investigation, the process of adsorbing pollutants by the activated carbon mainly comprises physical adsorption and chemical adsorption, wherein the physical adsorption is the adsorption process mainly occurring in the activated carbon, and the adsorption balance can be broken by changing the conditions, so that the adsorbate is separated in an analysis way; the chemisorption process is irreversible and essentially the activated carbon surface functional groups form stable complexes with contaminant molecules. In the specific action process, the active carbon is mainly subjected to physical adsorption, and after the physical adsorption approaches saturation, the active carbon is subjected to chemical adsorption intervention and directly and completely fails. Aiming at the characteristics, the searching way breaks the balance between the activated carbon and the adsorbate, so that physical adsorption is carried out in the reverse direction, and simultaneously the reaction progress of chemical adsorption is slowed down, the activated carbon is regenerated, the adsorption capacity is recovered, and the purpose of prolonging the service life can be achieved.

The method for prolonging the service life of the carbon filter element by regeneration is mainly realized by physical high temperature, steam or vibration and chemical reagent through researches. As patent CN217350956U discloses a self-cleaning device, regeneration of activated carbon fiber is realized by high-temperature steam mode, but the method is applicable to large-scale purification treatment devices in petrochemical industry and environmental protection industry, has high process realization requirement, and is not applicable to household water purifiers; patent CN113788554a discloses a method for dredging the gaps of activated carbon and recovering the adsorption capacity thereof by steam, vibration and physical impact, which can realize self-completion of the regeneration process, but not only realizes complex device, but also requires additional flocculant, and cannot guarantee the safety of the use process and drinking water; patent CN202654783U discloses a high-efficiency activated carbon fiber filtering device, regeneration of a filter element is realized by a method of soaking high-temperature steam with chlorine dioxide, but the water quality safety cannot be ensured by introducing chemical substance chlorine dioxide; patent CN101844075a discloses a device and a method for regenerating activated carbon, which are implemented by decomposing and reducing the pollutant adsorbed in the activated carbon in an electrolysis state and then desorbing the pollutant in the electrolysis state through an electrochemical method, but the safety of drinking water cannot be ensured and the electricity consumption is increased due to the precipitation of metal substances in the solution.

The small volume is the main development trend of the market at present, the low cost is helpful to promote the competitiveness of the product, and through the analysis, a general technology for more effectively prolonging the service life of the carbon filter element is necessary to be found. The aim of the embodiment is to solve the problems of short carbon filter life and frequent core replacement, improve the service life of the carbon filter core, meet the energy-saving and environment-friendly requirements, and improve the competitiveness of the product.

Embodiments of the present invention are described below with reference to fig. 1 to 8.

According to an embodiment of the present invention, there is provided a water purification system including a water making device, a water storage device, and a back flush line.

The water making device comprises a water making pipeline, and a front filter element 1 and a rear filter element 8 which are sequentially connected in series to the water making pipeline, wherein the front filter element 1 and the rear filter element 8 comprise a carbon water purifying unit, the front filter element 1 is provided with a front filter element water inlet 101 and a front filter element water outlet 102, and the rear filter element 8 is provided with a rear filter element water inlet 801 and a rear filter element water outlet 802.

The water storage device comprises a heating device 14, the water storage device is communicated with a water outlet 802 of the rear filter element through a water outlet pipeline, and the water outlet pipeline is provided with a reversing structure.

The backflushing pipeline comprises a connecting pipeline 16 connected in parallel between the pre-filter water inlet 101 and the pre-filter water outlet 102, and a first drainage pipeline 4 respectively communicated with the pre-filter water inlet 101 and the post-filter water inlet 801.

When the water purification system executes a first back flushing mode, hot water sequentially flows through the connecting pipeline 16, the pre-filter element water outlet 102, the pre-filter element 1, the pre-filter element water inlet 101 and the first drainage pipeline 4;

when the water purification system executes the second back flushing mode, water in the water storage device flows to the post filter element water outlet 802, the post filter element 8, the post filter element water inlet 801 and the first drainage pipeline 4 in sequence through the reversing structure.

In this embodiment, when the water purification system is normally producing water, tap water flows along the water production pipeline to produce water, and finally flows to the water storage device, and the tap water is stored in the water storage device for use by a user, and the water storage device comprises the heating device, so that the tap water can be heated to a temperature required by the user for use by the user. After the front filter element is used for a period of time, more impurities are adsorbed, the water purification system is switched to a first back flushing mode, and the front filter element can be back flushed. The charcoal water purification unit comprises active carbon, when the water purification system is in a first back flush mode, hot water sequentially flows through a connecting pipeline, a water outlet of the front filter element, a water inlet of the front filter element and a first drainage pipeline, the front filter element is reversely flushed, the hot water can break the balance between the active carbon and pollutant adsorbates, so that the pollutant is desorbed in an analyzing mode, the impurity adsorbed by the front filter element can be effectively stripped and removed, the adsorption capacity of the active carbon in the front filter element is recovered, the regeneration is realized, and flushing water with the impurity flows out from the inlet of the front filter element and then is discharged from the first drainage pipeline. When the rear filter element is used for a period of time, more impurities are adsorbed, the water purification system is switched to a second back flushing mode, and the rear filter element can be back flushed. When the water purification system is in the second back flush mode, hot water in the water storage device enters the rear filter element from the rear filter element water outlet of the rear filter element after passing through the reversing structure, the rear filter element is reversely flushed, the balance between the activated carbon and the pollutant-adsorbing substances can be broken through by the hot water, the pollutant is desorbed in a resolving mode, and impurities adsorbed by the rear filter element can be effectively stripped and removed, so that part of adsorption capacity of the activated carbon in the rear filter element is recovered, regeneration is realized, and water flow flows out from the rear filter element water inlet and then is discharged from the first drainage pipeline.

Specifically in one embodiment, the pre-filter water inlet 101 is connected with a water inlet pipeline 3 communicated with the tap water inlet 2, the pre-filter water inlet 101 is also connected with a first water draining pipeline 4, and the first water draining pipeline 4 is provided with a first switch valve 5.

The water making device further comprises a fine filter element 6, wherein the fine filter element 6 is provided with a fine filter element water inlet 601, a pure water port 602 and a waste water port 603, and the fine filter element water inlet 601 is communicated with the front filter element water outlet 102 through a first pipeline 7.

The rear filter element water inlet 801 is connected with the pure water port 602 through a second pipeline 9, the second pipeline 9 is provided with a second switch valve 10, the rear filter element water inlet 801 is communicated with the first drainage pipeline 4 through a second drainage pipeline 11, and the second drainage pipeline 11 is provided with a third switch valve 12.

The water storage device is provided with a water inlet end 1301 and a water outlet end 1402, wherein the water inlet end 1301 is connected with a water outlet 802 of the rear filter element through a water outlet pipeline, and the water outlet end 1402 is connected with the water outlet pipeline.

The connecting pipeline 16 is connected with the water inlet pipeline 3 and the first pipeline 7 or the front filter element water outlet 102.

The first pipe switching structure has a first state in which the water intake pipe 3 is communicated with the pre-cartridge water inlet 101, and a second state in which the water intake pipe 3 is communicated with the connecting pipe 16.

The water purification system further comprises a first pipeline switching structure and a second pipeline switching structure.

The second pipe switching structure has a third state in which the pre-cartridge water outlet 102 communicates with the fine-cartridge water inlet 601, and a fourth state in which the connecting pipe 16 communicates with the pre-cartridge water outlet 102.

The reversing structure has a fifth state in which the post-cartridge water outlet 802 communicates with the water inlet 1301 in the forward direction, and a sixth state in which the water outlet 1402 communicates with the post-cartridge water outlet 802 in the reverse direction.

When the water purifying system executes the water making mode, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, and the second switch valve 10 is opened.

When the water purification system executes the first back flushing mode, the first pipeline switching structure is in a second state, the second pipeline switching structure is in a fourth state, the front filter element is reversely flushed, and the water reversely flushed by the front filter element is heated tap water. When the water purification system executes the second back flushing mode, the reversing structure is in a sixth state, the second switching valve 10 is closed, the rear filter element 8 is backwashed, and the water backwashed by the rear filter element 8 is heated pure water.

In this embodiment, when the water purification system is normally producing water, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, the first switch valve 5 is closed, the second switch valve 10 is opened, the third switch valve 12 is closed, tap water enters the pre-filter 1 through the pre-filter water inlet 101, flows out of the pre-filter water outlet 102 after being filtered by the pre-filter 1, then enters the fine filter 6 through the first pipeline 7 for filtering, pure water formed by filtering through the fine filter 6 flows out of the pure water outlet 602, flows into the post-filter 8 through the second pipeline 9, flows into the water storage device through the water outlet pipeline after being filtered again by the post-filter 8, and is stored in the water storage device for use by a user, and the water storage device comprises the heating device 14, so that the water can be heated to a temperature required by the user for use by the user. After the front filter element 1 is used for a period of time, more impurities are adsorbed, the water purification system is switched to a first back flushing mode, and the front filter element 1 can be back flushed. When the water purification system is in the first back flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first switch valve 5 is opened. At this time, the water flows into the water inlet pipeline 3 and then flows into the connecting pipeline 16, enters the pre-filter 1 from the pre-filter water outlet 102 after passing through the connecting pipeline 16, and is reversely flushed to the pre-filter 1, and the impurities adsorbed by the pre-filter 1 can be effectively stripped and removed because the water reversely flushed to the pre-filter 1 is hot water, and the flushing water with the impurities flows out from the inlet of the pre-filter 1 and is discharged from the first water discharge pipeline 4. When the rear filter element 8 is used for a period of time, more impurities are adsorbed, the water purifying system is switched to a second back flushing mode, and the rear filter element 8 can be back flushed. When the water purification system is in the second back flushing mode, the reversing structure is in a sixth state, the second switch valve 10 is closed, the third switch valve 12 is opened, hot water in the water storage device enters the rear filter element 8 from the rear filter element water outlet 802 of the rear filter element 8 after passing through the water outlet pipeline, the rear filter element 8 is subjected to back flushing, and the water for back flushing the rear filter element 8 is hot water, so that impurities adsorbed by the rear filter element 8 can be effectively stripped and removed, and then water flows out from the rear filter element water inlet 801 and is discharged from the second water discharge pipeline 11.

Therefore, the water purification system can reversely flush the pre-filter element 1 and the post-filter element 8, prolongs the service lives of the pre-filter element 1 and the post-filter element 8, does not need frequent replacement, has lower cost compared with the related art, and can ensure the safety of water.

It should be noted that, the pre-filter element 1 is used for removing organic matters, colloid, heavy metals, silt particles and the like, and has various embodying forms, for example, is formed by connecting a first-stage PP cotton or ultrafiltration and a first-stage pre-activated carbon filter element in series, or is a composite filter element directly in the form of a first-stage PCB and the like; most of the rear filter elements 8 are rear activated carbon filter elements, which can be positioned before or after the pure water outlet part and are the last stage in the water purification system for removing trace elements, adjusting pH, drinking taste and the like; the fine filter element 6 mainly comprises RO membranes, is a core component of a water purification system, has extremely high purification precision, and can filter out all impurities except water molecules.

It should be noted that, since the fine filter element 6 is generally not resistant to high temperature, when the pre-filter element 1 and the post-filter element 8 are backwashed, the fine filter element 6 is avoided, and damage to the fine filter element 6 is avoided.

It should be noted that, the water purifying system further includes a pump (not shown in the figure), the pump is mainly a booster pump 26 and a water pump, and the booster pump 26 is used for boosting and controlling the closing and opening of the whole water purifying system; the water pump is used for realizing the water taking function of a user.

For the program control of the turning-off of each component and the operation of the whole machine, the starting and stopping of the booster pump 26, the power of the heating component 18 and the turning-off of the pipeline control valve are mainly controlled according to related detection parameters (such as water purifying amount, time, water temperature, liquid level and the like) so as to realize the switching of each mode. Since the focus of this embodiment is to back flush the pre-filter cartridge 1 and the post-filter cartridge 8 with hot water, this embodiment is not a focus of this embodiment for specific program control and will not be described in detail.

In one embodiment, the water inlet pipeline 3 is provided with a fourth switch valve 17, the water purification system also has a soaking mode, and when the water purification system executes the soaking mode, the first switch valve 5, the second switch valve 10, the third switch valve 12 and the fourth switch valve 17 are closed.

In this embodiment, when the first back flushing mode and the second back flushing mode are performed, the second switch valve 10 is always closed, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the reversing structure is in the sixth state, after hot water fully enters the post filter element 8 and the pre filter element 1, the first switch valve 5, the third switch valve 12 and the fourth switch valve 17 are closed, at this time, under the cooperation of the fourth switch valve 17 and the first switch valve 5, the hot water pre filter element 1 is fully soaked, under the action of the third switch valve 12, the post filter element 8 and the pre filter element 1 are fully soaked, impurities adsorbed by the post filter element 8 and the pre filter element 1 are separated, after soaking for a period of time, the first switch valve 5, the third switch valve 12 and the fourth switch valve 17 are opened, the post filter element 8 and the pre filter element 1 are reversely flushed by flowing hot water, the flushing water reversely flushed by the pre filter element 1 is discharged through the first drain pipe 4, and the post filter element 8 is reversely flushed by the second drain pipe 11. The back flushing effect on the post filter element 8 and the pre filter element 1 can be further improved.

In one embodiment, the water purification system further has a first cooling mode and a second cooling mode; when the water purification system executes a first cooling mode, the first pipeline switching structure is in a second state, the second pipeline switching structure is in a fourth state, the front filter element 1 is reversely flushed, and water reversely flushed by the front filter element 1 is normal-temperature tap water; when the water purifying system executes the second cooling mode, the reversing structure is in a fifth state, the rear filter element 8 is reversely flushed, and water reversely flushed by the rear filter element 8 is normal-temperature pure water.

In this embodiment, since the water backflushing the pre-filter element 1 and the post-filter element 8 is hot water and the fine filter element 6 is generally not resistant to high temperature during the first backflushing mode and the second backflushing mode, after the backflushing mode is finished, before the water preparation mode, the water purification system is switched to the first cooling mode and the second cooling mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the reversing structure is in the fifth state, normal-temperature tap water enters the water inlet pipeline 3 and flows to the connecting pipeline 16, enters the pre-filter element 1 from the pre-filter element water outlet 102 after passing through the connecting pipeline 16, backflushes the pre-filter element 1, and finally the water flowing out from the pre-filter element water inlet 101 is discharged through the first water discharge pipeline 4. After the unheated normal-temperature pure water in the water storage device passes through the water outlet pipeline, the pure water enters the post-filter element 8 from the post-filter element water outlet 802 of the post-filter element 8, the post-filter element 8 is reversely flushed, and the water flowing out from the post-filter element water inlet 801 is finally discharged through the second water discharge pipeline 11. Therefore, after the first cooling mode and the second cooling mode, no hot water exists in the front filter element 1, so that the damage to the fine filter element 6 caused by the hot water flowing to the fine filter element 6 during normal water production can be avoided.

In one embodiment, the water purification system has an operating state in which the first backwash mode and the first cooling mode are alternately operated, and/or the second backwash mode and the second cooling mode are alternately operated.

In this embodiment, the optimal regeneration may be achieved by alternating the first backwash mode and the first cooling mode and/or the second backwash mode and the second cooling mode.

Specifically, the first back flushing mode and the second back flushing mode specifically include various forms of running water flushing, soaking, long-time flushing, short-time flushing and the like, and the back flushing mode and the cooling mode can be operated alternately to obtain the optimal regeneration effect.

The first back flushing mode and the second back flushing mode are used for back flushing the front filter element 1 and the rear filter element 8, and the soaked hot water temperature is higher than the ambient temperature and lower than the boiling point of water.

In one embodiment, the connecting line 16 is provided with a heating element 18.

In this embodiment, the heating element 18 is external to the pre-filter cartridge 1 and does not affect the replacement of the pre-filter cartridge 1.

Specifically, when the water purification system normally produces water, the first pipeline switching structure is in a first state, the second pipeline switching structure is in a third state, the reversing structure is in a fifth state, the first switch valve 5 is closed, the second switch valve 10 is opened, the third switch valve 12 is closed, tap water enters the front filter element 1 through the front filter element water inlet 101, after being filtered by the front filter element 1, flows out of the front filter element water outlet 102, then enters the fine filter element 6 through the first pipeline 7 for filtering, pure water formed by the filtering of the fine filter element 6 flows out of the pure water outlet 602, flows into the rear filter element 8 through the second pipeline 9, flows into the water storage device through the water outlet pipeline after being filtered again by the rear filter element 8, is stored in the water storage device for use by a user, and the water storage device comprises the heating device 14, so that the water can be heated to a temperature required by the user for use by the user. After the front filter element 1 is used for a period of time, more impurities are adsorbed, the water purification system is switched to a first back flushing mode, and the front filter element 1 can be back flushed. When the water purification system is in the first back flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first switch valve 5 is opened. At this time, the water flows into the water inlet pipeline 3 and then flows into the connecting pipeline 16, and after being heated by the components on the connecting pipeline 16, the water enters the pre-filter 1 from the pre-filter water outlet 102, and the pre-filter 1 is reversely flushed, and as the water reversely flushed by the pre-filter 1 is hot water, impurities adsorbed by the pre-filter 1 can be effectively stripped and removed, and the flushing water with the impurities flows out from the inlet of the pre-filter 1 and is discharged from the first drainage pipeline 4. When the rear filter element 8 is used for a period of time, more impurities are adsorbed, the water purifying system is switched to a second back flushing mode, and the rear filter element 8 can be back flushed. When the water purification system is in the second back flushing mode, the reversing structure is in a sixth state, the second switch valve 10 is closed, the third switch valve 12 is opened, hot water in the water storage device enters the rear filter element 8 from the rear filter element water outlet 802 of the rear filter element 8 after passing through the water outlet pipeline, the rear filter element 8 is subjected to back flushing, and the water for back flushing the rear filter element 8 is hot water, so that impurities adsorbed by the rear filter element 8 can be effectively stripped and removed, and then water flows out from the rear filter element water inlet 801 and is discharged from the second water discharge pipeline 11.

In one embodiment, the membrane shell of the pre-cartridge 1 is provided with a heating member 18.

In this embodiment, the heating member 18 is provided integrally with the membrane shell of the pre-cartridge 1, and when the membrane shell is separated from the inner core, only the inner core can be replaced when the cartridge is replaced, and when the membrane shell is integrated with the inner core, the entire cartridge needs to be replaced when the cartridge is replaced.

Specifically, when the water purification system normally produces water, the first pipeline switching structure is in a first state, the second pipeline switching structure is in a third state, the reversing structure is in a fifth state, the first switch valve 5 is closed, the second switch valve 10 is opened, the third switch valve 12 is closed, tap water enters the front filter element 1 through the front filter element water inlet 101, after being filtered by the front filter element 1, flows out of the front filter element water outlet 102, then enters the fine filter element 6 through the first pipeline 7 for filtering, pure water formed by the filtering of the fine filter element 6 flows out of the pure water outlet 602, flows into the rear filter element 8 through the second pipeline 9, flows into the water storage device through the water outlet pipeline after being filtered again by the rear filter element 8, is stored in the water storage device for use by a user, and the water storage device comprises the heating device 14, so that the water can be heated to a temperature required by the user for use by the user. After the front filter element 1 is used for a period of time, more impurities are adsorbed, the water purification system is switched to a first back flushing mode, and the front filter element 1 can be back flushed. When the water purification system is in the first back flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first switch valve 5 is opened. At this time, water flows into the water inlet pipeline 3 and then flows into the connecting pipeline 16, enters the pre-filter 1 from the pre-filter water outlet 102 after passing through the connecting pipeline 16, and is reversely flushed to the pre-filter 1, and as the membrane shell of the pre-filter 1 is provided with the heating component 18, the heating component 18 heats the water for reversely flushing the pre-filter 1 to be hot water, so that impurities adsorbed by the pre-filter 1 can be effectively stripped and removed, and flushing water with the impurities flows out from the inlet of the pre-filter 1 and then is discharged from the first water discharge pipeline 4. When the rear filter element 8 is used for a period of time, more impurities are adsorbed, the water purifying system is switched to a second back flushing mode, and the rear filter element 8 can be back flushed. When the water purification system is in the second back flushing mode, the reversing structure is in a sixth state, the second switch valve 10 is closed, the third switch valve 12 is opened, hot water in the water storage device enters the rear filter element 8 from the rear filter element water outlet 802 of the rear filter element 8 after passing through the water outlet pipeline, the rear filter element 8 is subjected to back flushing, and the water for back flushing the rear filter element 8 is hot water, so that impurities adsorbed by the rear filter element 8 can be effectively stripped and removed, and then water flows out from the rear filter element water inlet 801 and is discharged from the second water discharge pipeline 11.

In one embodiment, the water purification system comprises a water temperature detection element and a controller, wherein the controller is in communication connection with the water temperature detection element and the heating component 18, the water temperature detection element can detect the temperature of water for back flushing the pre-filter element 1 and the post-filter element 8 in a first back flushing mode and a second back flushing mode, and the controller can adjust the power of the heating component 18 and the heating device 14 according to the temperature of the water for back flushing the pre-filter element 1 and the post-filter element 8.

In this embodiment, different temperature backwash modes may be achieved by adjusting the power to the heating element 18.

In one embodiment, the water storage device comprises a pure water tank 13, the pure water tank 13 having a water inlet 1301 and a pure water tank water outlet 1302, the pure water tank water outlet 1302 being in communication with a heating water inlet 1401 of a heating device 14, the heating device 14 having a water outlet 1402, the water outlet 1402 being in communication with a water intake 15.

In this embodiment, when the water purification system normally produces water, as shown in fig. 3 and 4, the thickened lines indicate the flow direction of the water, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, the first switching valve 5 is closed, the second switching valve 10 is opened, the third switching valve 12 is closed, at this time, tap water enters the pre-filter 1 through the pre-filter water inlet 101, flows out of the pre-filter water outlet 102 after being filtered by the pre-filter 1, then enters the fine filter 6 through the first pipeline 7 for filtering, pure water formed by filtering by the fine filter 6 flows out of the pure water outlet 602, flows into the post-filter 8 through the post-filter 8 for storage through the water outlet pipeline after being filtered again, and when a user needs to take water, the water in the pure water tank 13 is pumped to the heating device 14, the heating device 14 is operated or is not operated, and then flows out of the water outlet 15 for use by the user. After the front filter element 1 and the rear filter element 8 are used for a period of time, more impurities are adsorbed, the water purifying system is switched to a first back flushing mode and a second back flushing mode, and the front filter element 1 and the rear filter element 8 can be back flushed. When the water purification system is in the first back flushing mode and the second back flushing mode, as shown in fig. 5 and 6, the thickened lines in the figures indicate the flow direction of water, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the reversing structure is in the sixth state, the first switching valve 5 is opened, the second switching valve 10 is closed, and the third switching valve 12 is opened. At this time, the water flows into the water inlet pipeline 3 and then flows into the connecting pipeline 16, enters the pre-filter 1 from the pre-filter water outlet 102 after passing through the connecting pipeline 16, and is reversely flushed to the pre-filter 1, and the impurities adsorbed by the pre-filter 1 can be effectively stripped and removed because the water reversely flushed to the pre-filter 1 is hot water, and the flushing water with the impurities flows out from the inlet of the pre-filter 1 and is discharged from the first water discharge pipeline 4. The water in the pure water tank 13 is pumped to the heating device 14, the heating device 14 works to generate hot water, the hot water enters the post filter element 8 from the post filter element water outlet 802 of the post filter element 8 after passing through the water outlet pipeline, the post filter element 8 is reversely flushed, and the water reversely flushed by the post filter element 8 is hot water, so that impurities adsorbed by the post filter element 8 can be effectively stripped and removed, and then water flows out from the post filter element water inlet 801 and is discharged from the second water discharge pipeline 11. After the first back flushing mode and the second back flushing mode, the water purifying system is switched into a first cooling mode and a second cooling mode, as shown in fig. 7 and 8, the thickened lines in the figures indicate the flow direction of water, the first pipeline switching structure is in a second state, the second pipeline switching structure is in a fourth state, the reversing structure is in a fifth state, the first switching valve 5 is opened, the second switching valve 10 is closed, the third switching valve 12 is opened, normal-temperature tap water enters the water inlet pipeline 3 and flows into the connecting pipeline 16, enters the front filter element 1 from the front filter element water outlet 102 after passing through the connecting pipeline 16, reversely washes the front filter element 1, and finally water flowing out from the front filter element water inlet 101 is discharged through the first water discharge pipeline 4. After normal-temperature pure water in the pure water tank 13 reversely flows through the water outlet pipeline, the normal-temperature pure water enters the post-filter element 8 from the post-filter element water outlet 802 of the post-filter element 8, reversely washes the post-filter element 8, and finally water flowing out from the post-filter element water inlet 801 is discharged through the second water discharge pipeline 11. Therefore, after the first cooling mode and the second cooling mode, no hot water exists in the front filter element 1, so that the damage to the fine filter element 6 caused by the hot water flowing to the fine filter element 6 during normal water production can be avoided.

In an embodiment not shown in the figures, the heating device 14 may be arranged in the pure water tank 13.

In an embodiment not shown in the figures, the heating means 14 may be a hot tank.

In one embodiment, the first line switching arrangement comprises a first three-way valve 19 provided at the connection point of the connecting line 16 with the water inlet line 3.

In this embodiment, the first pipeline switching structure is the first three-way valve 19, and the first state that the water inlet pipeline 3 is communicated with the water inlet 101 of the pre-filter element and the second state that the water inlet pipeline 3 is communicated with the connecting pipeline 16 can be realized by controlling the first three-way valve 19, so that the structure is simple and the control is convenient.

Specifically, the first three-way valve 19 has a first port near the tap water inlet 2, a second port near the pre-cartridge 1, and a third port connected to the connecting pipe 16, and is in a first state when the first port is in communication with the second port, and is in a second state when the first port is in communication with the third port. Specifically, the first three-way valve 19 is switched to a first state in which the first port and the second port are communicated with each other in the water producing mode, and the first three-way valve 19 is switched to a second state in which the first port and the third port are communicated with each other in the backwash mode and the cooling mode.

In an embodiment not shown in the drawings, the first pipeline switching structure may include on-off valves respectively disposed on the connection pipeline 16 and the water inlet pipeline 3 and close to the pre-filter element 1, and the on-off of the two on-off valves is controlled to switch different states of the first pipeline switching structure.

In one embodiment, the connecting line 16 is connected to the first line 7, and the second line switching structure includes a second three-way valve 20 provided at the connection point of the connecting line 16 and the first line 7.

In this embodiment, the second pipeline switching structure is the second three-way valve 20, and the second three-way valve 20 is controlled to realize the third state that the pre-filter water outlet 102 is communicated with the fine filter water inlet 601 and the fourth state that the connecting pipeline 16 is communicated with the pre-filter water outlet 102, so that the structure is simple and convenient to control.

Specifically, the second three-way valve 20 has a fourth port near the side of the pre-filter element 1, a fifth port near the side of the polishing filter element 6, and a sixth port connected to the connecting line 16, and is in the third state when the fourth port is communicated with the fifth port, and is in the fourth state when the fifth port is communicated with the sixth port. Specifically, the second three-way valve 20 is switched to the third state in which the fourth port communicates with the fifth port in the water making mode, and the second three-way valve 20 is switched to the fourth state in which the fifth port communicates with the sixth port in the back flushing mode and the cooling mode.

In an embodiment not shown in the figures, the second line switching structure may comprise on-off valves provided on the first line 7 and the connecting line 16, respectively, by controlling the switching of these two on-off valves, the switching of the different states of the second line switching structure.

In one embodiment, the water outlet 1402 is connected to the water outlet line via a third line 22, and the reversing arrangement includes a third three-way valve 21 disposed at the junction of the water outlet line and the third line 22.

In this embodiment, the reversing structure is a third three-way valve 21, and the third three-way valve 21 is controlled to realize a fifth state in which the water outlet 802 of the rear filter element is in forward communication with the water inlet 1301, and a sixth state in which the water outlet 1402 is in reverse communication with the water outlet 802 of the rear filter element, which is simple in structure and convenient to control.

Specifically, the third three-way valve 21 has a seventh port near the water outlet 802 of the post-cartridge, an eighth port near the water inlet 1301 of the water reservoir, and a ninth port connected to the third pipe 22, and is in a fifth state when the seventh port is in communication with the eighth port, and in a sixth state when the ninth port is in communication with the seventh port. Specifically, in the water making mode, the third three-way valve 21 is switched to the fifth state in which the seventh port communicates with the eighth port, and in the back flushing mode and the cooling mode, the third three-way valve 21 is switched to the sixth state in which the ninth port communicates with the seventh port.

In one embodiment, the water purification system further comprises a coarse filter element 23, the coarse filter element 23 having a coarse filter element water inlet 2301, a coarse filter element water outlet 2302, the coarse filter element water inlet 2301 being in communication with the tap water inlet 2, the coarse filter element water outlet 2302 being connected to the pre-cartridge water inlet 101 by a water inlet line 3.

In the embodiment, by arranging the coarse filter element 23, tap water is filtered by the coarse filter element 23 and then enters the front filter element 1 for filtering in the water making mode; in the back flush mode, tap water is filtered by the coarse filter element 23 and then flows to the pre-filter element 1 through the connecting pipeline 16, so that the pollution of impurities in tap water to the pre-filter element 1 in the back flush mode can be avoided.

In one embodiment, the waste water port 603 is connected to a concentrate line 24, the concentrate line 24 is provided with a waste water solenoid valve 25, and the first drain line 4 and the second drain line 11 are both in communication with the concentrate line 24.

In this embodiment, the flushing water for back flushing the pre-filter element 1 and the post-filter element 8 is discharged through the concentrated water pipe 24, and the structure is simple and compact.

Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims

1. A water purification system, comprising:

the water making device comprises a water making pipeline and a front filter element (1) and a rear filter element (8) which are sequentially connected in series to the water making pipeline, wherein the front filter element (1) and the rear filter element (8) comprise a carbon water purifying unit, the front filter element (1) is provided with a front filter element water inlet (101) and a front filter element water outlet (102), and the rear filter element (8) is provided with a rear filter element water inlet (801) and a rear filter element water outlet (802);

the water storage device comprises a heating device (14), the water storage device is communicated with a water outlet (802) of the rear filter element through a water outlet pipeline, and the water outlet pipeline is provided with a reversing structure;

a back flushing pipeline comprising a connecting pipeline (16) connected in parallel between the pre-filter water inlet (101) and the pre-filter water outlet (102), and a first drainage pipeline (4) respectively communicated with the pre-filter water inlet (101) and the post-filter water inlet (801);

when the water purification system executes a first back flushing mode, hot water sequentially flows through the connecting pipeline (16), the pre-filter element water outlet (102), the pre-filter element (1), the pre-filter element water inlet (101) and the first drainage pipeline (4);

When the water purification system executes a second back flushing mode, hot water in the water storage device flows to the post filter element water outlet (802), the post filter element (8), the post filter element water inlet (801) and the first drainage pipeline (4) in sequence through the reversing structure.

2. The water purification system according to claim 1, wherein the pre-filter water inlet (101) is connected with a water inlet pipe (3) communicated with a tap water inlet (2), the pre-filter water inlet (101) is also connected with the first water draining pipeline (4), and the first water draining pipeline (4) is provided with a first switch valve (5);

the water making device further comprises a fine filter element (6), the fine filter element (6) is provided with a fine filter element water inlet (601), a pure water port (602) and a waste water port (603), and the fine filter element water inlet (601) is communicated with the front filter element water outlet (102) through a first pipeline (7);

the water inlet (801) of the rear filter element is connected with the pure water port (602) through a second pipeline (9), the second pipeline (9) is provided with a second switch valve (10), the water inlet (801) of the rear filter element is communicated with the first water discharge pipeline (4) through a second water discharge pipeline (11), and the second water discharge pipeline (11) is provided with a third switch valve (12);

The water storage device is provided with a water inlet end (1301) and a water outlet end (1402), the water inlet end (1301) is connected with a water outlet (802) of the rear filter element through the water outlet pipeline, and the water outlet end (1402) is connected with the water outlet pipeline;

the connecting pipeline (16) is connected with the water inlet pipeline (3) and the first pipeline (7) or the front filter element water outlet (102);

the water purification system further comprises a first pipeline switching structure and a second pipeline switching structure, wherein the first pipeline switching structure is provided with a first state for enabling the water inlet pipeline (3) to be communicated with the water inlet (101) of the front filter element and a second state for enabling the water inlet pipeline (3) to be communicated with the connecting pipeline (16); the second pipeline switching structure is provided with a third state for enabling the front filter element water outlet (102) to be communicated with the fine filter element water inlet (601) and a fourth state for enabling the connecting pipeline (16) to be communicated with the front filter element water outlet (102);

the reversing structure has a fifth state in which the rear filter element water outlet (802) is communicated with the water inlet end (1301), and a sixth state in which the water outlet end (1402) is communicated with the rear filter element water outlet (802);

when the water purification system executes a water making mode, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, and the second switch valve (10) is opened;

When the water purification system executes the first back flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the front filter element (1) is reversely flushed, and the water reversely flushed by the front filter element (1) is heated tap water;

when the water purification system executes the second back flushing mode, the reversing structure is in a sixth state, the second switching valve (10) is closed, the rear filter element (8) is reversely flushed, and the water reversely flushed by the rear filter element (8) is heated pure water.

3. The water purification system according to claim 2, characterized in that the water inlet line (3) is provided with a fourth switching valve (17), the water purification system further having a soaking mode, the first switching valve (5), the second switching valve (10), the third switching valve (12), the fourth switching valve (17) being closed when the water purification system performs the soaking mode.

4. The water purification system of claim 2, further having a first cooling mode and a second cooling mode;

when the water purification system executes the first cooling mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the front filter element (1) is reversely flushed, and water reversely flushed by the front filter element (1) is normal-temperature tap water;

When the water purification system executes the second cooling mode, the reversing structure is in the fifth state, the rear filter element (8) is reversely flushed, and water reversely flushed by the rear filter element (8) is normal-temperature pure water.

5. The water purification system of claim 4, wherein the water purification system has an operating state that causes the first backwash mode and the first cooling mode to alternately operate, and/or the second backwash mode and the second cooling mode to alternately operate.

6. A water purification system according to any one of claims 1 to 5, wherein the connecting line (16) is provided with a heating element (18);

alternatively, the membrane shell of the pre-filter element (1) is provided with a heating member (18).

7. The water purification system according to claim 6, comprising a water temperature detection element and a controller in communication with the water temperature detection element and the heating means (18), the water temperature detection element being capable of detecting the temperature of the water backflushing the pre-filter cartridge (1) and the post-filter cartridge (8) in the first backflushing mode, the second backflushing mode, the controller being capable of adjusting the power of the heating means (18) and the heating means (14) depending on the temperature of the water backflushing the pre-filter cartridge (1) and the post-filter cartridge (8).

8. The water purification system according to any one of claims 2 to 5, wherein the water storage device comprises a pure water tank (13), the pure water tank (13) having the water inlet end (1301) and a pure water tank water outlet (1302), the pure water tank water outlet (1302) being in communication with a heating water inlet (1401) of the heating device (14), the heating device (14) having the water outlet end (1402), the water outlet end (1402) being in communication with a water intake (15).

9. A water purification system according to any one of claims 2 to 5, wherein the first line switching structure comprises a first three-way valve (19) provided at the connection point of the connection line (16) and the water inlet line (3).

10. A water purification system according to any one of claims 2 to 5, wherein the connecting line (16) is connected to the first line (7) and the second line switching structure comprises a second three-way valve (20) provided at the connection point of the connecting line (16) to the first line (7).

11. A water purification system according to any one of claims 2 to 5, wherein the water outlet end (1402) is connected to the water outlet line via a third line (22), and the reversing arrangement comprises a third three-way valve (21) provided at the connection point of the water outlet line to the third line (22).

12. The water purification system according to any one of claims 2 to 5, further comprising a coarse filter cartridge (23), the coarse filter cartridge (23) having a coarse filter cartridge water inlet (2301), a coarse filter cartridge water outlet (2302), the coarse filter cartridge water inlet (2301) being in communication with the tap water inlet (2), the coarse filter cartridge water outlet (2302) being connected to the pre-cartridge water inlet (101) via the water inlet line (3).

13. The water purification system according to any one of claims 2 to 5, wherein the waste water port (603) is connected with a concentrate line (24), the concentrate line (24) is provided with a waste water solenoid valve (25), and the first drain line (4) and the second drain line (11) are both in communication with the concentrate line (24).