Water purification system

Abstract

The present invention relates to the field of water purification technology and discloses a water purification system, comprising: a water production device, including a water production pipeline and a pre-filter and a post-filter connected in series to the water production pipeline in sequence; a water storage device, the water storage device including a heating device; a backwash pipeline; when the water purification system performs a first backwash mode, hot water flows through the connecting pipeline, the pre-filter outlet, the pre-filter, the pre-filter inlet and the first drainage pipeline in sequence; when the water purification system performs a second backwash mode, water in the water storage device flows to the post-filter outlet, the post-filter, the post-filter inlet and the first drainage pipeline in sequence through the reversing structure. The present invention can backwash the pre-filter and the post-filter, extend the service life of the pre-filter and the post-filter, extend the replacement cycle, and do not need frequent replacement. Compared with related technologies, the cost is lower, and water safety can be ensured. The regeneration process of the carbon water purification unit in the pre-filter and the post-filter is safe and simple.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification, and in particular to a water purification system. Background Art

[0002] During the pipeline transportation process, tap water is inevitably contaminated by rust, silt, organic matter, and microorganisms. With increasing concern about water quality safety, water purifiers with purification functions are gradually gaining market acceptance. A water purifier's water purification system typically includes a pre-treatment filter element, a precision filter element, and a post-treatment filter element. The pre-treatment filter element is used to remove organic matter, colloids, heavy metals, and silt particles. Pre-treatment filters are extremely precise, such as reverse osmosis membrane filters, which are the core treatment filters of the water purification system. Post-treatment filters are used to remove trace elements, adjust pH, and enhance drinking taste. Because activated carbon can effectively remove oxidizing substances such as residual chlorine that can damage precision RO filters, it is an indispensable component of a water purifier's pre-treatment filter element. However, compared to other filter elements, activated carbon filters have a shorter lifespan, requiring frequent replacement and limiting the rated water purification capacity of the entire system. Summary of the Invention

[0003] In view of this, the present invention provides a water purification system to solve the problem that the activated carbon filter element has a short life and needs to be replaced frequently.

[0004] The present invention provides a water purification system, comprising:

[0005] A water production device, comprising a water production pipeline and a pre-filter element and a post-filter element connected in series to the water production pipeline, the pre-filter element and the post-filter element comprising a carbon water purification unit, the pre-filter element having a pre-filter element water inlet and a pre-filter element water outlet, and the post-filter element having a post-filter element water inlet and a post-filter element water outlet;

[0006] A water storage device, the water storage device including a heating device, the water storage device being connected to the water outlet of the post-filter element via a water outlet pipe, and the water outlet pipe being provided with a reversing structure;

[0007] A backwash pipeline, comprising 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 respectively connected to the water inlet of the pre-filter element and the water inlet of the post-filter element;

[0008] When the water purification system performs the first backwash mode, hot water flows through the connecting pipe, the pre-filter outlet, the pre-filter, the pre-filter inlet and the first drainage pipe in sequence, and the water in the water storage device flows through the reversing structure to the post-filter outlet, the post-filter, the post-filter inlet and the first drainage pipe in sequence;

[0009] When the water purification system executes the second backwash mode, the hot water in the water storage device flows to the post-filter outlet, the post-filter, the post-filter inlet and the first drainage pipe in sequence through the reversing structure.

[0010] Beneficial effects: When the water purification system produces water normally, tap water flows along the water production pipeline to produce water, and finally flows to the water storage device, where it is stored for user use. The water storage device includes a heating device, so the water can be heated to the temperature required by the user for user use. When the pre-filter element has been used for a period of time and has adsorbed a lot of impurities, the water purification system is switched to the first backwash mode to backwash the pre-filter element. The carbon water purification unit includes activated carbon. When the water purification system is in the first backwash mode, hot water flows through the connecting pipe, the pre-filter element outlet, the pre-filter element, the pre-filter element inlet and the first drain pipe in sequence to backwash the pre-filter element. The hot water can break the balance between the activated carbon and the pollutant adsorbent, so that the pollutants are analyzed and desorbed, and the impurities adsorbed by the pre-filter element can be effectively stripped off and removed, so that the activated carbon in the pre-filter element can restore some of its adsorption capacity and achieve regeneration. The flushing water with impurities flows out of the pre-filter element inlet and is discharged from the first drain pipe. When the post-filter element has been used for a period of time and has absorbed a large amount of impurities, the water purification system is switched to the second backwash mode to perform backwashing on the post-filter element. When the water purification system is in the second backwash mode, the hot water in the water storage device passes through the reversing structure and enters the post-filter element from the post-filter element water outlet to perform backwashing on the post-filter element. The hot water can break the balance between the activated carbon and the pollutant adsorbent, allowing the pollutants to be desorbed and effectively stripped away from the impurities adsorbed by the post-filter element, thereby restoring some of the adsorption capacity of the activated carbon in the post-filter element and achieving regeneration. The water then flows out from the post-filter element water inlet and is discharged from the first drainage pipe.

[0011] Therefore, the water purification system can reverse flush the pre-filter and post-filter, thereby extending the service life of the pre-filter and post-filter, extending the replacement cycle, and eliminating the need for frequent replacement. Compared with related technologies, it is less costly and can ensure water safety. The regeneration process of the carbon water purification unit in the pre-filter and post-filter is safe and simple.

[0012] In an optional embodiment, the water inlet of the pre-filter is connected to a water inlet pipeline connected to a tap water inlet, and the water inlet of the pre-filter is also connected to the first drainage pipeline, and the first drainage pipeline is provided with a first switch valve;

[0013] The water production device further includes a fine filter element, the fine filter element having a fine filter element water inlet, a pure water outlet and a waste water outlet, and the fine filter element water inlet is connected to the pre-filter element water outlet through a first pipeline;

[0014] The water inlet of the post-filter element is connected to the pure water port through a second pipeline, the second pipeline is provided with a second switch valve, the water inlet of the post-filter element is connected to the first drainage pipeline through a second drainage pipeline, and the second drainage pipeline is provided with a third switch valve;

[0015] The water storage device has a water inlet end and a water outlet end, the water inlet end is connected to the water outlet of the post-filter element through a water outlet pipe, and the water outlet end is connected to the water outlet pipe;

[0016] The connecting pipe connects the water inlet pipe and the first pipe or the water outlet of the pre-filter;

[0017] The water purification system further includes a first pipeline switching structure and a second pipeline switching structure, wherein the first pipeline switching structure has a first state in which the water inlet pipeline is connected to the water inlet of the pre-filter element and a second state in which the water inlet pipeline is connected to the connecting pipeline; the second pipeline switching structure has a third state in which the water outlet of the pre-filter element is connected to the water inlet of the fine filter element and a fourth state in which the connecting pipeline is connected to the water outlet of the pre-filter element;

[0018] The reversing structure has a fifth state in which the water outlet of the post-filter element is connected to the water inlet end, and a sixth state in which the water outlet end is connected to the water outlet of the post-filter element;

[0019] When the water purification system is in water production 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 open;

[0020] When the water purification system performs the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the pre-filter element is backwashed, and the water used for backwashing the pre-filter element is heated tap water;

[0021] When the water purification system executes the second backwash mode, the reversing structure is in the sixth state, the second switch valve is closed, the post-filter element is backwashed, and the water used for backwashing the post-filter element is heated pure water.

[0022] Beneficial Effects: When the water purification system is producing water normally, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, and the reversing structure is in the fifth state. The first on-off valve is closed, the second on-off valve is open, and the third on-off valve is closed. At this time, tap water enters the pre-filter through the pre-filter inlet, is filtered by the pre-filter, and flows out of the pre-filter outlet. It then enters the fine filter through the first pipeline for filtration. The purified water formed by the fine filter flows out of the pure water outlet, flows into the post-filter through the second pipeline, and is filtered again by the post-filter through the outlet pipeline to the water storage device. The water storage device includes a heating device, so that the water can be heated to the user's desired temperature for use. When the pre-filter absorbs a large amount of impurities after a period of use, the water purification system is switched to the first backwash mode to backwash the pre-filter. When the water purification system is in the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first on-off valve is open. At this point, water enters the water inlet pipe and flows toward the connecting pipe. After passing through the connecting pipe, it enters the pre-filter cartridge through the pre-filter cartridge outlet, performing a backwash on the pre-filter cartridge. Since the water used to backwash the pre-filter cartridge is hot water, it effectively removes impurities adsorbed by the pre-filter cartridge. The impurity-laden flushing water flows out of the pre-filter cartridge inlet and is discharged through the first drain pipe. When the post-filter cartridge has been used for a period of time and has absorbed a significant amount of impurities, the water purification system is switched to a second backwash mode to backwash the post-filter cartridge. When the water purification system is in the second backwash mode, the reversing structure is in a sixth state, with the second on-off valve closed and the third on-off valve open. Hot water within the water storage device flows through the water outlet pipe and enters the post-filter cartridge through the post-filter cartridge outlet, performing a backwash on the post-filter cartridge. Since the water used to backwash the post-filter cartridge is hot water, it effectively removes impurities adsorbed by the post-filter cartridge. The water then flows out of the post-filter cartridge inlet and is discharged through the second drain pipe.

[0023] Therefore, the water purification system can reverse flush the pre-filter and post-filter, extending the service life of the pre-filter and post-filter without the need for frequent replacement. Compared with related technologies, it is lower in cost and can ensure water safety.

[0024] In an optional embodiment, the water inlet pipeline is provided with a fourth switch valve, and the water purification system also has an immersion mode. When the water purification system executes the immersion mode, the first switch valve, the second switch valve, the third switch valve, and the fourth switch valve are closed.

[0025] Beneficial Effect: In the first and second backwash modes, the second on-off valve is always closed. The first pipeline switching structure is first set to the second state, the second pipeline switching structure is set to the fourth state, and the reversing structure is set to the sixth state. After hot water fully enters the post-filter and pre-filter, the first, third, and fourth on-off valves are closed. At this time, the hot water fully soaks the pre-filter under the cooperation of the fourth on-off valve and the first on-off valve. Under the action of the third on-off valve, the post-filter is fully soaked, so that impurities adsorbed by the post-filter and pre-filter are removed. After soaking for a period of time, the first, third, and fourth on-off valves are opened, and the post-filter and pre-filter are reverse-flushed with flowing hot water. The flushing water for the reverse flushing of the pre-filter is discharged through the first drainage pipeline, and the flushing water for the reverse flushing of the post-filter is discharged through the second drainage pipeline. This can further improve the reverse flushing effect of the post-filter and pre-filter.

[0026] In an optional embodiment, the water purification system also 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, and the second pipeline switching structure is in the fourth state, the pre-filter element is reversely flushed, and the water used for reverse flushing the pre-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 post-filter element is reversely flushed, and the water used for reverse flushing the post-filter element is normal temperature pure water.

[0027] Beneficial effect: Since the water used for backwashing the pre-filter and post-filter in the first backwash mode and the second backwash mode is hot water, and the fine filter is usually not resistant to high temperature, after the backwash mode ends and before the water production 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, and the reversing structure is in the fifth state. Normal temperature tap water enters the water inlet pipeline and flows to the connecting pipeline. After passing through the connecting pipeline, it enters the pre-filter from the water outlet of the pre-filter, and the pre-filter is backwashed. The water flowing out of the water inlet of the pre-filter is finally discharged through the first drainage pipeline. The unheated normal temperature pure water in the water storage device enters the post-filter from the water outlet of the post-filter after passing through the water outlet pipeline, and the post-filter is backwashed. The water flowing out of the water inlet of the post-filter is finally discharged through the second drainage pipeline. Therefore, after the first cooling mode and the second cooling mode, there is no hot water in the pre-filter element, which can avoid damage to the fine filter element due to hot water flowing into the fine filter element during normal water production.

[0028] In an optional embodiment, the water purification system has an operating state in which the first backwash mode and the first cooling mode are operated alternately, and / or the second backwash mode and the second cooling mode are operated alternately.

[0029] Beneficial effect: By alternately operating the first backwashing mode and the first cooling mode, and / or alternately operating the second backwashing mode and the second cooling mode, an optimal regeneration effect can be achieved.

[0030] In an optional embodiment, the connecting pipeline is provided with a heating component.

[0031] Beneficial effect: The heating component is placed outside the pre-filter element, which does not affect the replacement of the pre-filter element.

[0032] In an optional embodiment, the membrane housing of the pre-filter element is provided with a heating component.

[0033] Beneficial effect: The heating component is integrated with the membrane shell of the pre-filter element. When the membrane shell is separated from the inner core, only the inner core can be replaced when replacing the filter element. When the membrane shell and the inner core are integrated, the entire filter element needs to be replaced.

[0034] In an optional embodiment, the water purification system includes a water temperature detection element and a controller, and the controller is communicatively connected with the water temperature detection element and the heating component. The water temperature detection element can detect the temperature of water used for backwashing the pre-filter and the post-filter in the first backwash mode and the second backwash mode, and the controller can adjust the power of the heating component and the heating device according to the temperature of water used for backwashing the pre-filter and the post-filter.

[0035] Beneficial effect: Backwash modes with different temperatures can be achieved by adjusting the power of the heating component.

[0036] In an optional embodiment, the water storage device includes a pure water tank, which has the water inlet and the pure water tank outlet, and the pure water tank outlet is connected to the heating water inlet of the heating device, and the heating device has the water outlet, and the water outlet is connected to the water intake.

[0037] In an optional embodiment, the first pipeline switching structure includes a first three-way valve provided at a connection point between the connecting pipeline and the water inlet pipeline.

[0038] Beneficial effect: The first pipeline switching structure is a first three-way valve. By controlling the first three-way valve, the first state in which the water inlet pipeline is connected to the water inlet of the pre-filter element and the second state in which the water inlet pipeline is connected to the connecting pipeline can be achieved. The structure is simple and easy to control.

[0039] In an optional embodiment, the connecting pipeline is connected to the first pipeline, and the second pipeline switching structure includes a second three-way valve provided at the connection point between the connecting pipeline and the first pipeline.

[0040] Beneficial effect: The second pipeline switching structure is a second three-way valve. By controlling the second three-way valve, the third state in which the water outlet of the pre-filter element is connected to the water inlet of the fine filter element and the fourth state in which the connecting pipeline is connected to the water outlet of the pre-filter element can be achieved. The structure is simple and easy to control.

[0041] In an optional embodiment, the water outlet is connected to the water outlet pipeline via a third pipeline, and the reversing structure includes a third three-way valve provided at the connection point between the water outlet pipeline and the third pipeline.

[0042] Beneficial effect: The reversing structure is a third three-way valve. By controlling the third three-way valve, the fifth state in which the water outlet of the post-filter element is forwardly connected to the water inlet end and the sixth state in which the water outlet end is reversely connected to the water outlet of the post-filter element can be achieved. The structure is simple and easy to control.

[0043] In an optional embodiment, the water purification system also includes a coarse filter element, which has a coarse filter element water inlet and a coarse filter element water outlet. The coarse filter element water inlet is connected to the tap water inlet, and the coarse filter element water outlet is connected to the pre-filter element water inlet through the water inlet pipe.

[0044] Beneficial effect: By setting the coarse filter element, in the water production mode, the tap water is first filtered by the coarse filter element, and then enters the pre-filter element for filtration; in the backwash mode, the tap water is first filtered by the coarse filter element, and then flows to the pre-filter element through the connecting pipe, which can avoid the impurities in the tap water in the backwash mode from contaminating the pre-filter element.

[0045] In an optional embodiment, the wastewater outlet is connected to a concentrated water pipeline, the concentrated water pipeline is provided with a wastewater solenoid valve, and the first drainage pipeline and the second drainage pipeline are both connected to the concentrated water pipeline.

[0046] Beneficial effects: The flushing water for reverse flushing of the pre-filter element and the post-filter element is discharged through the concentrated water pipe, and the structure is simple and compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 This is a schematic diagram of a water purification system according to an embodiment of the present invention when the heating component is externally disposed on a pre-filter element;

[0049] Figure 2 This is a schematic diagram of a water purification system according to an embodiment of the present invention when the heating component is built into the pre-filter element;

[0050] Figure 3 for Figure 1 The schematic diagram of the water purification system shown is in water production mode;

[0051] Figure 4 for Figure 2 The schematic diagram of the water purification system shown is in water production mode;

[0052] Figure 5 for Figure 1 The schematic diagram of the water purification system shown is in backwash mode;

[0053] Figure 6 for Figure 2 The schematic diagram of the water purification system shown is in backwash mode;

[0054] Figure 7 for Figure 1 The schematic diagram of the water purification system shown is in cooling mode;

[0055] Figure 8 for Figure 2 Schematic diagram of the water purification system in cooling mode.

[0056] Description of reference numerals:

[0057] 1. Pre-filter element; 101. Pre-filter element water inlet; 102. Pre-filter element water outlet; 2. Tap water inlet; 3. Water inlet pipeline; 4. First drain pipeline; 5. First on / off valve; 6. Fine filter element; 601. Fine filter element water inlet; 602. Pure water outlet; 603. Waste water outlet; 7. First pipeline; 8. Post-filter element; 801. Post-filter element water inlet; 802. Post-filter element water outlet; 9. Second pipeline; 10. Second on / off valve; 11. Second drain pipeline; 12. Third on / off valve; 13. Pure water tank; 1301. Water inlet; 1302. Pure water tank outlet; 14. Heating device; 1401. Heating water inlet; 1402. Water outlet; 15. Water intake; 16. Connecting pipe; 17. Fourth switch valve; 18. Heating component; 19. First three-way valve; 20. Second three-way valve; 21. Third three-way valve; 22. Third pipe; 23. Coarse filter element; 2301. Coarse filter element water inlet; 2302. Coarse filter element water outlet; 24. Concentrated water pipe; 25. Wastewater solenoid valve; 26. Booster pump. DETAILED DESCRIPTION

[0058] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0059] In order to achieve the goal of long filter life and less filter replacement for water purifiers, the industry extends the life of carbon filters mainly by improving carbon materials, manufacturing processes and increasing carbon usage, which can improve water purification performance and life to a certain extent. However, there are always failure points, and it is necessary to find a breakthrough to extend the life of activated carbon filters.

[0060] Research has shown that activated carbon's adsorption of pollutants primarily involves physical adsorption and chemical adsorption. Physical adsorption is the primary adsorption process in activated carbon; changing the conditions can disrupt the adsorption equilibrium, causing the adsorbate to dissolve and detach. Chemical adsorption is an irreversible process, essentially forming a stable complex between the activated carbon's surface functional groups and the pollutant molecules. During the specific process, activated carbon initially acts primarily through physical adsorption. Once physical adsorption approaches saturation, chemical adsorption intervenes, leading to complete ineffectiveness. By targeting these characteristics, finding ways to disrupt the equilibrium between activated carbon and the adsorbate, reversing physical adsorption while slowing the chemical adsorption reaction process can regenerate the activated carbon and restore its adsorption capacity, ultimately extending its service life.

[0061] According to research, the main methods of extending the life of carbon filter elements through regeneration are physical high temperature, steam or vibration, and chemical reagents. For example, patent CN217350956U discloses a self-cleaning purification device that regenerates activated carbon fibers through high-temperature steam. However, this method is suitable for large-scale purification treatment equipment in the petrochemical and environmental protection industries, but has high process requirements and is not suitable for household water purifiers. Patent CN113788554A discloses a method that uses water vapor, vibration, and physical impact to unclog the gaps in activated carbon and restore its adsorption capacity. This method can achieve a self-complete regeneration process, but not only is the device complex to implement, but it also requires the addition of additional flocculants, which cannot guarantee the safety of the use process and drinking water. Patent CN202654783U discloses a high-efficiency activated carbon fiber filtration device that regenerates the filter element through chlorine dioxide immersion and high-temperature steam. However, the introduction of the chemical chlorine dioxide cannot guarantee water quality safety. Patent CN101844075A discloses an activated carbon regeneration device and method. Through an electrochemical method, pollutants adsorbed in the activated carbon are decomposed and reduced in an electrolytic state and then desorbed to achieve activated carbon regeneration. However, the precipitation of metal substances in the solution cannot guarantee the safety of drinking water and increases electricity consumption.

[0062] Small size is currently the main market trend, and low cost helps improve product competitiveness. Based on the above analysis, it is necessary to find a more effective universal technology for extending the life of carbon filter elements. The purpose of this embodiment is to solve the problems of short carbon filter life and frequent filter replacement, extend the life of the carbon filter element, and meet energy conservation and environmental protection requirements, thereby improving product competitiveness.

[0063] The following combination Figures 1 to 8 , describing embodiments of the present invention.

[0064] According to an embodiment of the present invention, a water purification system is provided, including a water production device, a water storage device and a backwash pipeline.

[0065] The water production device includes a water production pipeline and a pre-filter element 1 and a post-filter element 8 connected in series to the water production pipeline in sequence. The pre-filter element 1 and the post-filter element 8 contain a carbon water purification unit. The pre-filter element 1 has a pre-filter element water inlet 101 and a pre-filter element water outlet 102. The post-filter element 8 has a post-filter element water inlet 801 and a post-filter element water outlet 802.

[0066] The water storage device includes a heating device 14. The water storage device is connected to the water outlet 802 of the post-filter element through a water outlet pipeline, and the water outlet pipeline is provided with a reversing structure.

[0067] The backwash pipeline includes 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 connected to the pre-filter water inlet 101 and the post-filter water inlet 801 respectively.

[0068] When the water purification system performs the first backwash mode, hot water flows through the connecting pipe 16, the pre-filter outlet 102, the pre-filter 1, the pre-filter inlet 101 and the first drainage pipe 4 in sequence;

[0069] When the water purification system executes the second backwash mode, the water in the water storage device flows to the post-filter outlet 802, the post-filter 8, the post-filter inlet 801 and the first drainage pipe 4 in sequence through the reversing structure.

[0070] In this embodiment, when the water purification system is producing water normally, tap water flows along the water production pipeline to produce water and ultimately flows to the water storage device, where it is stored for user use. The water storage device includes a heating device, so that the water can be heated to the user's desired temperature for use. When the pre-filter cartridge has absorbed a large amount of impurities after a period of use, the water purification system is switched to a first backwash mode to backwash the pre-filter cartridge. The carbon water purification unit includes activated carbon. When the water purification system is in the first backwash mode, hot water flows sequentially through the connecting pipeline, the pre-filter cartridge outlet, the pre-filter cartridge, the pre-filter cartridge inlet, and the first drain pipe to backwash the pre-filter cartridge. The hot water can break the equilibrium between the activated carbon and the pollutant adsorbent, allowing the pollutants to be desorbed and effectively stripped and removed from the impurities adsorbed by the pre-filter cartridge, thereby restoring some of the adsorption capacity of the activated carbon in the pre-filter cartridge and achieving regeneration. The flushing water containing impurities flows out of the pre-filter cartridge inlet and is discharged from the first drain pipe. When the post-filter element has been used for a period of time and has absorbed a large amount of impurities, the water purification system is switched to the second backwash mode to perform backwashing on the post-filter element. When the water purification system is in the second backwash mode, the hot water in the water storage device passes through the reversing structure and enters the post-filter element from the post-filter element water outlet to perform backwashing on the post-filter element. The hot water can break the balance between the activated carbon and the pollutant adsorbent, allowing the pollutants to be desorbed and effectively stripped away from the impurities adsorbed by the post-filter element, thereby restoring some of the adsorption capacity of the activated carbon in the post-filter element and achieving regeneration. The water then flows out from the post-filter element water inlet and is discharged from the first drainage pipe.

[0071] Therefore, the water purification system can reverse flush the pre-filter and post-filter, thereby extending the service life of the pre-filter and post-filter, extending the replacement cycle, and eliminating the need for frequent replacement. Compared with related technologies, it is less costly and can ensure water safety. The regeneration process of the carbon water purification unit in the pre-filter and post-filter is safe and simple.

[0072] Specifically in one embodiment, the pre-filter water inlet 101 is connected to a water inlet pipe 3 connected to the tap water inlet 2 , and the pre-filter water inlet 101 is also connected to a first drainage pipe 4 , which is provided with a first switch valve 5 .

[0073] The water production device further includes a fine filter element 6 , which has a fine filter element water inlet 601 , a pure water outlet 602 and a waste water outlet 603 . The fine filter element water inlet 601 is connected to the pre-filter element water outlet 102 through a first pipeline 7 .

[0074] The post-filter water inlet 801 is connected to the pure water port 602 through the second pipeline 9, and the second pipeline 9 is provided with a second switch valve 10. The post-filter water inlet 801 is connected to the first drainage pipeline 4 through the second drainage pipeline 11, and the second drainage pipeline 11 is provided with a third switch valve 12.

[0075] The water storage device has a water inlet end 1301 and a water outlet end 1402. The water inlet end 1301 is connected to the water outlet 802 of the post-filter element through a water outlet pipeline, and the water outlet end 1402 is connected to the water outlet pipeline.

[0076] The connecting pipe 16 connects the water inlet pipe 3 and the first pipe 7 or the water outlet 102 of the pre-filter.

[0077] The first pipeline switching structure has a first state in which the water inlet pipeline 3 is connected to the pre-filter water inlet 101 , and a second state in which the water inlet pipeline 3 is connected to the connecting pipeline 16 .

[0078] The water purification system also includes a first pipeline switching structure and a second pipeline switching structure.

[0079] The second pipeline switching structure has a third state in which the pre-filter element water outlet 102 is connected to the fine filter element water inlet 601 , and a fourth state in which the connecting pipeline 16 is connected to the pre-filter element water outlet 102 .

[0080] The reversing structure has a fifth state in which the water outlet 802 of the post-filter element is connected to the water inlet end 1301 in a forward direction, and a sixth state in which the water outlet end 1402 is connected to the water outlet 802 of the post-filter element in a reverse direction.

[0081] When the water purification system executes the water production 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 open.

[0082] When the water purification system is in the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the pre-filter element is backwashed, and the water used for backwashing the pre-filter element is heated tap water. When the water purification system is in the second backwash mode, the reversing structure is in the sixth state, the second switch valve 10 is closed, and the post-filter element 8 is backwashed, and the water used for backwashing the post-filter element 8 is heated pure water.

[0083] In this embodiment, when the water purification system is producing water normally, 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 on-off valve 5 is closed, the second on-off valve 10 is open, and the third on-off valve 12 is closed. At this time, tap water enters the pre-filter element 1 through the pre-filter element water inlet 101, is filtered by the pre-filter element 1, and flows out of the pre-filter element water outlet 102. It then enters the fine filter element 6 through the first pipeline 7 for filtration. The pure water formed by the fine filter element 6 flows out of the pure water outlet 602, flows into the post-filter element 8 through the second pipeline 9, and is filtered again by the post-filter element 8. After flowing through the water outlet pipeline, it flows to the water storage device, where it is stored for user use. The water storage device includes a heating device 14, so that the water can be heated to the user's desired temperature for user use. When the pre-filter element 1 has been used for a period of time and has absorbed a large amount of impurities, the water purification system is switched to the first backwash mode to backwash the pre-filter element 1. When the water purification system is in the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first on-off valve 5 is open. At this point, water enters the water inlet pipeline 3 and flows to the connecting pipeline 16. After passing through the connecting pipeline 16, it enters the pre-filter 1 through the pre-filter outlet 102, performing a backwash on the pre-filter 1. Because the water used to backwash the pre-filter 1 is hot water, it effectively removes impurities adsorbed by the pre-filter 1. The impurity-laden flushing water flows out of the pre-filter 1 inlet and is discharged through the first drain pipeline 4. When the post-filter 8, after a period of use, has absorbed a large amount of impurities, the water purification system is switched to the second backwash mode to perform a backwash on the post-filter 8. When the water purification system is in the second backwash mode, the reversing structure is in the sixth state, the second switch valve 10 is closed, and the third switch valve 12 is opened. The hot water in the water storage device enters the post-filter element 8 from the post-filter element water outlet 802 of the post-filter element 8 after passing through the outlet pipe, and reversely flushes the post-filter element 8. Since the water used to reversely flush the post-filter element 8 is hot water, the impurities adsorbed by the post-filter element 8 can be effectively stripped off and removed, and then the water flows out from the post-filter element water inlet 801 and is discharged from the second drain pipe 11.

[0084] Therefore, the water purification system can reversely flush the pre-filter element 1 and the post-filter element 8, thereby extending the service life of the pre-filter element 1 and the post-filter element 8 without the need for frequent replacement. Compared with related technologies, it has lower costs and can ensure water safety.

[0085] It should be noted that the pre-filter element 1 is used to remove organic matter, colloids, heavy metals and mud and sand particles, etc., and has various forms, such as a first-level PP cotton or ultrafiltration and a first-level pre-activated carbon filter element in series, or directly a composite filter element in the form of a first-level PCB; the post-filter element 8 is mostly a post-activated carbon filter element, which can be located before or after the pure water outlet part. It is the last stage in the water purification system and is used to remove trace elements, adjust pH and drinking taste, etc.; the fine filter element 6 is mainly composed of RO membrane, which is the core component of the water purification system. It has extremely high purification accuracy and can filter out all impurities except water molecules.

[0086] It should be noted that, since the fine filter element 6 is generally not resistant to high temperatures, in this embodiment, when the pre-filter element 1 and the post-filter element 8 are reversely flushed, the fine filter element 6 is avoided to avoid damage to the fine filter element 6.

[0087] It should be noted that the water purification system also includes a pump (not shown in the figure), which is mainly a booster pump 26 and a water pump. The booster pump 26 is used to increase the pressure and control the start and stop of the entire water purification system; the water pump is used to realize the user's water extraction function.

[0088] The program control of each component's startup and shutdown, as well as the overall operation of the unit, primarily controls the startup and shutdown of the booster pump 26, the power of the heating element 18, and the startup and shutdown of the pipeline control valve based on relevant detection parameters (such as the amount of purified water, time, water temperature, and liquid level), thereby achieving switching between various modes. Since the focus of this embodiment is on backwashing the pre-filter element 1 and the post-filter element 8 with hot water, the specific program control is not the focus of this embodiment and will not be described in detail.

[0089] In one embodiment, the water inlet pipe 3 is provided with a fourth switch valve 17, and the water purification system also has an immersion mode. When the water purification system executes the immersion mode, the first switch valve 5, the second switch valve 10, the third switch valve 12, and the fourth switch valve 17 are closed.

[0090] In this embodiment, during the first backwash mode and the second backwash mode, the second switch valve 10 is always closed. The first pipeline switching structure is first placed in the second state, the second pipeline switching structure is placed in the fourth state, and the reversing structure is placed 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, with 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 is fully soaked, so that impurities adsorbed by the post-filter element 8 and the pre-filter element 1 fall off. 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, and the flowing hot water is used to reversely flush the post-filter element 8 and the pre-filter element 1. The flushing water for reverse flushing the pre-filter element 1 is discharged through the first drainage pipe 4, and the flushing water for reverse flushing the post-filter element 8 is discharged through the second drainage pipe 11. The backwashing effect on the post-filter element 8 and the pre-filter element 1 can be further improved.

[0091] In one embodiment, the water purification system also 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, and the second pipeline switching structure is in the fourth state, the pre-filter element 1 is reversely flushed, and the water for reverse flushing the pre-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 post-filter element 8 is reversely flushed, and the water for reverse flushing the post-filter element 8 is normal temperature pure water.

[0092] In this embodiment, since the water used to backwash the pre-filter 1 and the post-filter 8 in the first backwash mode and the second backwash mode is hot water, and the fine filter 6 is usually not resistant to high temperatures, after the backwash mode ends and before the water production 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, and the reversing structure is in the fifth state. After entering the water inlet pipeline 3, normal temperature tap water flows to the connecting pipeline 16, and after passing through the connecting pipeline 16, enters the pre-filter 1 from the pre-filter water outlet 102, and backwashes the pre-filter 1. The water flowing out from the pre-filter water inlet 101 is finally discharged through the first drainage pipeline 4. After passing through the outlet pipe, the unheated room-temperature pure water in the water storage device enters the post-filter element 8 from the post-filter element water outlet 802 of the post-filter element 8, thereby backwashing the post-filter element 8. The water flowing out of the post-filter element water inlet 801 is ultimately discharged through the second drain pipe 11. Therefore, after the first and second cooling modes, there is no hot water in the pre-filter element 1, which prevents damage to the fine filter element 6 caused by hot water flowing into the fine filter element 6 during normal water production.

[0093] In one embodiment, the water purification system has an operating state in which the first backwash mode and the first cooling mode are operated alternately, and / or the second backwash mode and the second cooling mode are operated alternately.

[0094] In this embodiment, the best regeneration effect can be achieved by alternately operating the first backwashing mode and the first cooling mode, and / or alternately operating the second backwashing mode and the second cooling mode.

[0095] Specifically, it should be noted that the first backwash mode and the second backwash mode include various forms such as running water flushing, soaking, long time flushing, short time flushing, etc. The backwash mode and the cooling mode can be operated alternately to obtain the best regeneration effect.

[0096] The first backwash mode and the second backwash mode reversely flush the pre-filter element 1 and the post-filter element 8 , and the temperature of the hot water used for soaking is higher than the ambient temperature and lower than the boiling point of water.

[0097] In one embodiment, the connecting line 16 is provided with a heating element 18 .

[0098] In this embodiment, the heating component 18 is externally disposed on the pre-filter element 1 , which does not affect the replacement of the pre-filter element 1 .

[0099] Specifically, when the water purification system is producing water normally, 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 on-off valve 5 is closed, the second on-off valve 10 is open, and the third on-off valve 12 is closed. At this time, tap water enters the pre-filter element 1 through the pre-filter element water inlet 101, is filtered by the pre-filter element 1, and flows out from the pre-filter element water outlet 102. It then enters the fine filter element 6 through the first pipeline 7 for filtration. The pure water formed by the fine filter element 6 flows out from the pure water outlet 602, flows into the post-filter element 8 through the second pipeline 9, and is filtered again by the post-filter element 8. After flowing through the water outlet pipeline, it flows to the water storage device, where it is stored for user use. The water storage device includes a heating device 14, so that the water can be heated to the user's desired temperature for user use. When the pre-filter element 1 has been used for a period of time and has absorbed a large amount of impurities, the water purification system is switched to the first backwash mode to reversely flush the pre-filter element 1. When the water purification system is in the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first on-off valve 5 is open. At this point, water enters the water inlet pipeline 3 and flows to the connecting pipeline 16. After being heated by the components on the connecting pipeline 16, it enters the pre-filter 1 through the pre-filter outlet 102, performing a backwash on the pre-filter 1. Because the water used to backwash the pre-filter 1 is hot water, it can effectively remove impurities adsorbed on the pre-filter 1. The impurity-laden flushing water flows out of the pre-filter 1 inlet and is discharged through the first drain pipeline 4. When the post-filter 8 has absorbed a large amount of impurities after a period of use, the water purification system is switched to the second backwash mode to perform a backwash on the post-filter 8. When the water purification system is in the second backwash mode, the reversing structure is in the sixth state, the second switch valve 10 is closed, and the third switch valve 12 is opened. The hot water in the water storage device enters the post-filter element 8 from the post-filter element water outlet 802 of the post-filter element 8 after passing through the outlet pipe, and reversely flushes the post-filter element 8. Since the water used to reversely flush the post-filter element 8 is hot water, the impurities adsorbed by the post-filter element 8 can be effectively stripped off and removed, and then the water flows out from the post-filter element water inlet 801 and is discharged from the second drain pipe 11.

[0100] In one embodiment, the membrane housing of the pre-filter element 1 is provided with a heating component 18 .

[0101] In this embodiment, the heating component 18 is integrated with the membrane shell of the pre-filter element 1. When the membrane shell is separated from the inner core, only the inner core can be replaced when replacing the filter element. When the membrane shell and the inner core are integrated, the entire filter element needs to be replaced.

[0102] Specifically, when the water purification system is producing water normally, 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 on-off valve 5 is closed, the second on-off valve 10 is open, and the third on-off valve 12 is closed. At this time, tap water enters the pre-filter element 1 through the pre-filter element water inlet 101, is filtered by the pre-filter element 1, and flows out from the pre-filter element water outlet 102. It then enters the fine filter element 6 through the first pipeline 7 for filtration. The pure water formed by the fine filter element 6 flows out from the pure water outlet 602, flows into the post-filter element 8 through the second pipeline 9, and is filtered again by the post-filter element 8. After flowing through the water outlet pipeline, it flows to the water storage device, where it is stored for user use. The water storage device includes a heating device 14, so that the water can be heated to the user's desired temperature for user use. When the pre-filter element 1 has been used for a period of time and has absorbed a large amount of impurities, the water purification system is switched to the first backwash mode to reversely flush the pre-filter element 1. When the water purification system is in the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first on-off valve 5 is open. At this time, water enters the water inlet pipeline 3 and flows to the connecting pipeline 16. After passing through the connecting pipeline 16, it enters the pre-filter 1 from the pre-filter outlet 102, performing a backwash on the pre-filter 1. Because the membrane housing of the pre-filter 1 is provided with a heating component 18, the heating component 18 heats the water used to backwash the pre-filter 1 to hot water. This effectively removes impurities adsorbed on the pre-filter 1. The impurity-laden flushing water flows out of the inlet of the pre-filter 1 and is discharged from the first drain pipeline 4. When the post-filter 8 has absorbed a large amount of impurities after a period of use, the water purification system is switched to the second backwash mode to perform a backwash on the post-filter 8. When the water purification system is in the second backwash mode, the reversing structure is in the sixth state, the second switch valve 10 is closed, and the third switch valve 12 is opened. The hot water in the water storage device enters the post-filter element 8 from the post-filter element water outlet 802 of the post-filter element 8 after passing through the outlet pipe, and reversely flushes the post-filter element 8. Since the water used to reversely flush the post-filter element 8 is hot water, the impurities adsorbed by the post-filter element 8 can be effectively stripped off and removed, and then the water flows out from the post-filter element water inlet 801 and is discharged from the second drain pipe 11.

[0103] In one embodiment, the water purification system includes a water temperature detection element and a controller, which are communicated with the water temperature detection element and the heating component 18. The water temperature detection element can detect the temperature of water used for backwashing the pre-filter 1 and the post-filter 8 in the first backwash mode and the second backwash mode. The controller can adjust the power of the heating component 18 and the heating device 14 according to the temperature of water used for backwashing the pre-filter 1 and the post-filter 8.

[0104] In this embodiment, backwashing modes with different temperatures can be achieved by adjusting the power of the heating component 18 .

[0105] In one embodiment, the water storage device includes a pure water tank 13, which has a water inlet 1301 and a pure water tank outlet 1302. The pure water tank outlet 1302 is connected to the heating water inlet 1401 of the heating device 14. The heating device 14 has a water outlet 1402, which is connected to the water intake 15.

[0106] In this embodiment, when the water purification system is producing water normally, Figure 3 and Figure 4 , the bold lines in the figure indicate the direction of water flow, 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 open, and the third switch valve 12 is closed. At this time, tap water enters the pre-filter 1 through the pre-filter inlet 101, is filtered by the pre-filter 1, and flows out from the pre-filter outlet 102, and then enters the fine filter 6 through the first pipeline 7 for filtration. The pure water formed by the filtration of the fine filter 6 flows out from the pure water port 602, flows into the post-filter 8 through the second pipeline 9, and is filtered again by the post-filter 8 and flows to the pure water tank 13 through the water outlet pipeline for storage. When the user needs to take water, the water in the pure water tank 13 is pumped to the heating device 14, and the heating device 14 works or does not work, and then flows out from the water intake 15 for user use. When the pre-filter element 1 and the post-filter element 8 have been used for a period of time and have absorbed a lot of impurities, the water purification system is switched to the first backwash mode and the second backwash mode to reversely flush the pre-filter element 1 and the post-filter element 8. Figure 5 and Figure 6 The bold lines in the figure indicate the direction of water flow. The first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the reversing structure is in the sixth state. The first switch valve 5 is open, the second switch valve 10 is closed, and the third switch valve 12 is open. At this time, water enters the water inlet pipe 3 and flows to the connecting pipe 16. After passing through the connecting pipe 16, it enters the pre-filter 1 from the pre-filter outlet 102, and reversely flushes the pre-filter 1. Since the water used to reversely flush the pre-filter 1 is hot water, it can effectively remove impurities adsorbed on the pre-filter 1. The flushing water with impurities flows out of the inlet of the pre-filter 1 and is discharged from the first drain pipe 4. The water in the pure water tank 13 is pumped to the heating device 14, and the heating device 14 generates hot water. After the hot water passes through the outlet pipe, it enters the post-filter element 8 from the post-filter element water outlet 802 of the post-filter element 8, and back-flushes the post-filter element 8. Since the water used to back-flush the post-filter element 8 is hot water, it can effectively remove the impurities adsorbed by the post-filter element 8. After that, the water flows out from the post-filter element water inlet 801 and is discharged from the second drainage pipe 11. After the first back-flushing mode and the second back-flushing mode, the water purification system switches to the first cooling mode and the second cooling mode, as shown in FIG. Figure 7 and Figure 8 The bold lines in the figure indicate the direction of water flow. The first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the reversing structure is in the fifth state. The first switch valve 5 is open, the second switch valve 10 is closed, and the third switch valve 12 is open. After entering the water inlet pipe 3, normal temperature tap water flows to the connecting pipe 16. After passing through the connecting pipe 16, it enters the pre-filter 1 from the pre-filter outlet 102, and reversely flushes the pre-filter 1. The water flowing out of the pre-filter inlet 101 is finally discharged through the first drainage pipe 4. After flowing back through the water outlet pipe, the normal temperature pure water in the pure water tank 13 enters the post-filter 8 from the post-filter outlet 802 of the post-filter 8, and reversely flushes the post-filter 8. The water flowing out of the post-filter inlet 801 is finally discharged through the second drainage pipe 11. Therefore, after the first cooling mode and the second cooling mode, there is no hot water in the pre-filter element 1, which can avoid damage to the fine filter element 6 caused by hot water flowing to the fine filter element 6 during normal water production.

[0107] In an embodiment not shown in the figures, the heating device 14 may be disposed in the pure water tank 13 .

[0108] In one embodiment not shown in the figures, the heating device 14 may be a hot pot.

[0109] In one embodiment, the first pipeline switching structure includes a first three-way valve 19 provided at the connection point between the connecting pipeline 16 and the water inlet pipeline 3 .

[0110] In this embodiment, the first pipeline switching structure is a first three-way valve 19. By controlling the first three-way valve 19, the first state in which the water inlet pipeline 3 is connected to the water inlet 101 of the pre-filter element and the second state in which the water inlet pipeline 3 is connected to the connecting pipeline 16 can be achieved. The structure is simple and easy to control.

[0111] Specifically, the first three-way valve 19 has a first port near the tap water inlet 2, a second port near the pre-filter 1, and a third port connected to the connecting pipe 16. When the first port is connected to the second port, the valve is in a first state, and when the first port is connected to the third port, the valve is in a second state. Specifically, in water production mode, the first three-way valve 19 switches to the first state, connecting the first port and the second port. In backwash mode and cooling mode, the first three-way valve 19 switches to the second state, connecting the first port and the third port.

[0112] In an embodiment not shown in the figure, the first pipeline switching structure may include switch valves respectively arranged on the connecting pipeline 16 and the water inlet pipeline 3 and close to the pre-filter 1, and the switching of different states of the first pipeline switching structure is achieved by controlling the switching of these two switch valves.

[0113] In one embodiment, the connecting pipeline 16 is connected to the first pipeline 7 , and the second pipeline switching structure includes a second three-way valve 20 provided at the connection point between the connecting pipeline 16 and the first pipeline 7 .

[0114] In this embodiment, the second pipeline switching structure is a second three-way valve 20. By controlling the second three-way valve 20, the third state in which the pre-filter element water outlet 102 is connected to the fine filter element water inlet 601 and the fourth state in which the connecting pipeline 16 is connected to the pre-filter element water outlet 102 can be achieved. The structure is simple and easy to control.

[0115] Specifically, the second three-way valve 20 has a fourth port near the pre-filter element 1, a fifth port near the fine filter element 6, and a sixth port connected to the connecting pipe 16. When the fourth port and the fifth port are connected, the valve is in the third state, and when the fifth port and the sixth port are connected, the valve is in the fourth state. Specifically, in the water production mode, the second three-way valve 20 switches to the third state, connecting the fourth port and the fifth port. In the backwash mode and the cooling mode, the second three-way valve 20 switches to the fourth state, connecting the fifth port and the sixth port.

[0116] In an embodiment not shown in the figure, the second pipeline switching structure may include switch valves respectively provided on the first pipeline 7 and the connecting pipeline 16, and the switching of different states of the second pipeline switching structure is achieved by controlling the switching of these two switch valves.

[0117] In one embodiment, the water outlet end 1402 is connected to the water outlet pipeline through a third pipeline 22 , and the reversing structure includes a third three-way valve 21 provided at the connection point between the water outlet pipeline and the third pipeline 22 .

[0118] In this embodiment, the reversing structure is a third three-way valve 21. By controlling the third three-way valve 21, the fifth state in which the water outlet 802 of the post-filter element is forwardly connected to the water inlet end 1301 and the sixth state in which the water outlet end 1402 is reversely connected to the water outlet 802 of the post-filter element can be realized. The structure is simple and easy to control.

[0119] Specifically, the third three-way valve 21 has a seventh port connected to the side of the post-filter outlet 802, an eighth port connected to the water inlet 1301 of the water storage device, and a ninth port connected to the third pipeline 22. When the seventh port is connected to the eighth port, the valve is in the fifth state, and when the ninth port is connected to the seventh port, the valve is in the sixth state. Specifically, in the water production mode, the third three-way valve 21 switches to the fifth state, connecting the seventh port to the eighth port. In the backwash mode and cooling mode, the third three-way valve 21 switches to the sixth state, connecting the ninth port to the seventh port.

[0120] In one embodiment, the water purification system also includes a coarse filter element 23, which has a coarse filter element water inlet 2301 and a coarse filter element water outlet 2302. The coarse filter element water inlet 2301 is connected to the tap water inlet 2, and the coarse filter element water outlet 2302 is connected to the pre-filter element water inlet 101 through the water inlet pipe 3.

[0121] In this embodiment, by setting a coarse filter element 23, in the water production mode, the tap water is first filtered by the coarse filter element 23 and then enters the pre-filter element 1 for filtration; in the backwash mode, the tap water is first filtered by the coarse filter element 23 and then flows to the pre-filter element 1 through the connecting pipe 16, which can prevent impurities in the tap water from contaminating the pre-filter element 1 in the backwash mode.

[0122] In one embodiment, the wastewater outlet 603 is connected to a concentrated water pipeline 24 , the concentrated water pipeline 24 is provided with a wastewater solenoid valve 25 , and the first drainage pipeline 4 and the second drainage pipeline 11 are both in communication with the concentrated water pipeline 24 .

[0123] In this embodiment, the flushing water for reverse 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.

[0124] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A water purification system, characterized in that: include: A water production device comprises a water production pipeline and a pre-filter element (1) and a post-filter element (8) sequentially connected to the water production pipeline, wherein the pre-filter element (1) and the post-filter element (8) comprise carbon water purification units, the pre-filter element (1) has a pre-filter element water inlet (101) and a pre-filter element water outlet (102), and the post-filter element (8) has a post-filter element water inlet (801) and a post-filter element water outlet (802); A water storage device, the water storage device comprising a heating device (14), the water storage device being in communication with the water outlet (802) of the post-filter element via a water outlet pipeline, and the water outlet pipeline being provided with a reversing structure; A reverse flushing pipeline comprises a connecting pipeline (16) connected in parallel between the pre-filter element water inlet (101) and the pre-filter element water outlet (102), and a first drainage pipeline (4) connected to the pre-filter element water inlet (101) and the post-filter element water inlet (801), respectively; When the water purification system performs the first backwash mode, hot water flows sequentially through the connecting pipe (16), the pre-filter water outlet (102), the pre-filter (1), the pre-filter water inlet (101), and the first drainage pipe (4); When the water purification system performs the second backwash mode, the hot water in the water storage device flows sequentially through the reversing structure to the post-filter cartridge water outlet (802), the post-filter cartridge (8), the post-filter cartridge water inlet (801) and the first drainage pipe (4).

2. The water purification system according to claim 1, characterized in that: The pre-filter water inlet (101) is connected to a water inlet pipe (3) in communication with a tap water inlet (2), and the pre-filter water inlet (101) is also connected to the first drainage pipe (4), and the first drainage pipe (4) is provided with a first switch valve (5); The water production device further comprises a fine filter element (6), the fine filter element (6) having a fine filter element water inlet (601), a pure water outlet (602) and a waste water outlet (603), the fine filter element water inlet (601) being in communication with the pre-filter element water outlet (102) via a first pipeline (7); The post-filter water inlet (801) is connected to the pure water port (602) via a second pipeline (9), the second pipeline (9) is provided with a second switch valve (10), the post-filter water inlet (801) is connected to the first drainage pipeline (4) via a second drainage pipeline (11), the second drainage pipeline (11) is provided with a third switch valve (12); The water storage device has a water inlet end (1301) and a water outlet end (1402), the water inlet end (1301) is connected to the post-filter outlet (802) via the water outlet pipeline, and the water outlet end (1402) is connected to the water outlet pipeline; The connecting pipeline (16) connects the water inlet pipeline (3) and the first pipeline (7) or the water outlet (102) of the pre-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 has a first state in which the water inlet pipeline (3) is connected to the water inlet (101) of the pre-filter element, and a second state in which the water inlet pipeline (3) is connected to the connecting pipeline (16); The second pipeline switching structure has a third state in which the pre-filter element water outlet (102) is connected to the fine filter element water inlet (601), and a fourth state in which the connecting pipeline (16) is connected to the pre-filter element water outlet (102); The reversing structure has a fifth state in which the post-filter element water outlet (802) is connected to the water inlet (1301), and a sixth state in which the water outlet (1402) is connected to the post-filter element water outlet (802); When the water purification system executes the water production 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 open; When the water purification system executes the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the pre-filter element (1) is backwashed, and the water used for backwashing the pre-filter element (1) is heated tap water; When the water purification system executes the second backwash mode, the reversing structure is in the sixth state, the second switch valve (10) is closed, the post-filter element (8) is backwashed, and the water used for backwashing the post-filter element (8) is heated pure water.

3. The water purification system according to claim 2, characterized in that: The water inlet pipeline (3) is provided with a fourth switch valve (17), and the water purification system also has a soaking mode. 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.

4. The water purification system according to claim 2, characterized in that: The water purification system also 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 pre-filter element (1) is reversely flushed, and the water used for reverse flushing the pre-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 post-filter element (8) is reversely flushed, and the water used for reverse flushing the post-filter element (8) is pure water at normal temperature.

5. The water purification system according to claim 4, characterized in that: The water purification system has an operating state in which the first backwashing mode and the first cooling mode are operated alternately, and / or the second backwashing mode and the second cooling mode are operated alternately.

6. The water purification system according to any one of claims 1 to 5, characterized in that: The connecting pipeline (16) is provided with a heating component (18); Alternatively, the membrane housing of the pre-filter element (1) is provided with a heating component (18).

7. The water purification system according to claim 6, characterized in that: The water purification system includes a water temperature detection element and a controller. The controller is in communication with the water temperature detection element and the heating component (18). The water temperature detection element can detect the temperature of water used for backwashing the pre-filter element (1) and the post-filter element (8) in the first backwash mode and the second backwash mode. The controller can adjust the power of the heating component (18) and the heating device (14) according to the temperature of water used for backwashing the pre-filter element (1) and the post-filter element (8).

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

9. The water purification system according to any one of claims 2 to 5, characterized in that: The first pipeline switching structure comprises a first three-way valve (19) provided at the connection point between the connecting pipeline (16) and the water inlet pipeline (3).

10. The water purification system according to any one of claims 2 to 5, characterized in that: The connecting pipeline (16) is connected to the first pipeline (7), and the second pipeline switching structure includes a second three-way valve (20) provided at the connection point between the connecting pipeline (16) and the first pipeline (7).

11. The water purification system according to any one of claims 2 to 5, characterized in that: The water outlet end (1402) is connected to the water outlet pipeline via a third pipeline (22), and the reversing structure includes a third three-way valve (21) provided at the connection point between the water outlet pipeline and the third pipeline (22).

12. The water purification system according to any one of claims 2 to 5, characterized in that: The water purification system further comprises a coarse filter element (23), the coarse filter element (23) having a coarse filter element water inlet (2301) and a coarse filter element water outlet (2302), the coarse filter element water inlet (2301) being in communication with the tap water inlet (2), and the coarse filter element water outlet (2302) being connected to the pre-filter element water inlet (101) via the water inlet pipeline (3).

13. The water purification system according to any one of claims 2 to 5, characterized in that: The wastewater outlet (603) is connected to a concentrated water pipeline (24), the concentrated water pipeline (24) is provided with a wastewater solenoid valve (25), and the first drainage pipeline (4) and the second drainage pipeline (11) are both in communication with the concentrated water pipeline (24).

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