Water purification system

Abstract

The present invention relates to the field of water purification technology, and discloses a water purification system, including: a water production device, which includes a water production pipeline and a pre-filter and a post-filter connected in series to the water production pipeline in sequence. The pre-filter has a pre-filter water inlet and a pre-filter water outlet, and the post-filter has a post-filter water inlet and a post-filter water outlet; a reverse flushing pipeline, which includes a first pipeline connected in parallel between the pre-filter water inlet and the post-filter water outlet, and a second pipeline connected in parallel between the post-filter water inlet and the pre-filter water outlet; when the water purification system executes the reverse flushing mode, hot water flows through the first pipeline, the post-filter water outlet, the post-filter, the post-filter water inlet, the second pipeline, the pre-filter water outlet, the pre-filter and the pre-filter water inlet in sequence. The present invention can reverse flush the pre-filter and the post-filter, extend the service life of the pre-filter and the post-filter, and does not need to be replaced frequently. Compared with the related technology, the cost is lower.

Description

Technical Field

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

[0002] During the transportation process in the pipe network, tap water will inevitably be contaminated with rust, sediment, organic matter, and microorganisms. With the increasing attention of people to water quality safety, water purifiers with purification functions have gradually been accepted by the market. The water purification system of a water purifier usually includes a pretreatment filter element, a precision filter element, and a post-treatment filter element. Among them, the pretreatment filter element is used to remove organic matter, colloids, heavy metals, and sediment particles, etc.; the precision filter element has extremely high precision, such as a reverse osmosis membrane filter element, which is the core treatment filter element of the water purification system; the post-treatment filter element is used to remove trace elements, adjust the pH value, and drinking taste, etc. Since activated carbon can effectively remove oxidizing substances such as residual chlorine that damage the precision filter RO filter element, the activated carbon filter element is an important and indispensable part of the pretreatment filter element of the water purifier. However, the activated carbon filter element has a shorter service life than other filter elements, not only requires frequent filter element replacement, but also limits the nominal value of the rated net water volume of the whole machine. Summary of the Invention

[0003] In view of this, the present invention provides a water purification system to solve the problems of short service life of the activated carbon filter element and the need for frequent replacement.

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

[0005] A water production device, including a water production pipeline and a pre-filter element and a post-filter element connected in series to the water production pipeline in sequence. The pre-filter element and the post-filter element include a carbon water purification unit. The pre-filter element has a pre-filter element water inlet and a pre-filter element water outlet, and the post-filter element has a post-filter element water inlet and a post-filter element water outlet;

[0006] A reverse flushing pipeline, including a first pipeline connected in parallel between the pre-filter element water inlet and the post-filter element water outlet, and a second pipeline connected in parallel between the post-filter element water inlet and the pre-filter element water outlet;

[0007] When the water purification system executes the reverse flushing mode, hot water flows through the first pipeline, the post-filter element water outlet, the post-filter element, the post-filter element water inlet, the second pipeline, the pre-filter element water outlet, the pre-filter element, and the pre-filter element water inlet in sequence.

[0008] Beneficial effects: When the water purification system is producing water normally, tap water is used for water production through the water production pipeline. After the pre-filter and post-filter have adsorbed a large amount of impurities after being used for a period of time, the water purification system is switched to the reverse flushing mode, and the pre-filter and post-filter can be reversely flushed. Hot water flows through the first pipeline, the outlet of the post-filter, the post-filter, the inlet of the post-filter, the second pipeline, the outlet of the pre-filter, the pre-filter, and the inlet of the pre-filter in sequence. The hot water enters the post-filter from the outlet of the post-filter to reversely flush the post-filter. The carbon water purification unit includes activated carbon. The hot water can break the balance between the activated carbon and the pollution adsorbents, causing the pollutants to desorb. It can effectively strip and remove the impurities adsorbed by the post-filter, so that the activated carbon in the post-filter can recover part of its adsorption capacity and achieve regeneration. Then, the water flows out from the inlet of the post-filter and enters the pre-filter from the outlet of the pre-filter through the second pipeline to reversely flush the pre-filter. The hot water can break the balance between the activated carbon and the pollution adsorbents, causing the pollutants to desorb. It can effectively strip and remove the impurities adsorbed by the pre-filter, so that the activated carbon in the pre-filter can recover part of its adsorption capacity and achieve regeneration.

[0009] Therefore, this water purification system can reversely flush the pre-filter and post-filter, extend the service life of the pre-filter and post-filter, extend the replacement cycle, and does not need to be replaced frequently. Compared with the related technology, the cost is lower, and it can ensure the safety of water use. The regeneration process of the carbon water purification unit in the pre-filter and post-filter is safe and simple.

[0010] In an alternative embodiment, the inlet of the pre-filter is connected to a water inlet pipe communicating with the tap water inlet, and the inlet of the pre-filter is also connected to a drain pipe, and the drain pipe is provided with a first on-off valve;

[0011] The water production device further includes a fine filter, which has a fine filter water inlet, a pure water outlet, and a waste water outlet. The fine filter water inlet is communicated with the outlet of the pre-filter through a third pipeline;

[0012] The inlet of the post-filter is connected to the pure water outlet through a fourth pipeline, and the outlet of the post-filter is connected to the water intake through a water outlet pipe;

[0013] The first pipeline communicates the outlet of the post-filter with the water inlet pipe;

[0014] The water purification system further includes:

[0015] A first pipeline switching structure, which has a first state of communicating the water inlet pipe with the inlet of the pre-filter and a second state of communicating the water inlet pipe with the first pipeline;

[0016] The second pipeline switching structure has a third state in which the pure water port is communicated with the water inlet of the post-filter and a fourth state in which the water inlet of the post-filter is communicated with the water outlet of the pre-filter;

[0017] The third pipeline switching structure has a fifth state in which the water outlet of the post-filter is communicated with the water intake port and a sixth state in which the first pipeline is communicated with the water outlet of the post-filter;

[0018] 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, and the third pipeline switching structure is in the fifth state;

[0019] When the water purification system executes the reverse flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state, and the pre-filter and the post-filter are reversely flushed, and the water for reverse flushing the pre-filter and the post-filter is hot water.

[0020] 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 third pipeline switching structure is in the fifth state, and the first switching valve is closed. At this time, tap water enters the pre-filter through the water inlet of the pre-filter, flows out from the water outlet of the pre-filter after being filtered by the pre-filter, then enters the fine filter through the first pipeline for filtration, and the pure water formed after being filtered by the fine filter flows out from the pure water port, flows into the post-filter through the second pipeline, and can be supplied to users for drinking after being filtered again by the post-filter. After the pre-filter and the post-filter have adsorbed more impurities after being used for a period of time, the water purification system is switched to the thermal regeneration mode, and the pre-filter and the post-filter can be reversely flushed. When the water purification system is in the thermal regeneration mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state. At this time, water enters the water inlet pipeline and then flows to the first pipeline, enters the post-filter through the water outlet of the post-filter of the post-filter after passing through the first pipeline, and reversely flushes the post-filter. Since the water for reverse flushing the post-filter is hot water, the impurities adsorbed by the post-filter can be effectively stripped and removed. Then the water flows out from the water inlet of the post-filter and enters the pre-filter through the third pipeline from the water outlet of the pre-filter, and reversely flushes the pre-filter. Since the water for reverse flushing the pre-filter is hot water, the impurities adsorbed by the pre-filter can be effectively stripped and removed. The flushing water with impurities flows out from the inlet of the pre-filter and is discharged from the drainage pipeline.

[0021] Therefore, the water purification system can backwash the pre-filter and the post-filter, extend the service life of the pre-filter and the post-filter, and does not need to be replaced frequently. Compared with the related technology, the cost is lower, and the water use safety can be ensured.

[0022] In an alternative embodiment, a second switching valve is provided in the water inlet pipeline, and the water purification system further has an immersion mode. When the water purification system executes the immersion mode, the first switching valve and the second switching valve are closed.

[0023] Beneficial effects: In the backwashing mode, first make the first pipeline switching structure in the second state, the second pipeline switching structure in the fourth state, and the third pipeline switching structure in the sixth state. After the hot water fully enters the post-filter and the pre-filter, close the first switching valve and the second switching valve. At this time, the hot water fully immerses the post-filter and the pre-filter, so that the impurities adsorbed by the post-filter and the pre-filter fall off. After soaking for a period of time, open the first switching valve and the second switching valve, and use the flowing hot water to backwash the post-filter and the pre-filter in the reverse direction. The flushing water is discharged through the drainage pipeline. The backwashing effect on the post-filter and the pre-filter can be further improved.

[0024] In an alternative embodiment, the water purification system further has a cooling mode. When the water purification system executes the cooling mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state, and the pre-filter and the post-filter are backwashed, and the water for backwashing the pre-filter and the post-filter is cold water.

[0025] Beneficial effects: Since the water for backwashing the pre-filter and the post-filter is hot water in the backwashing mode, and the fine filter element is usually not resistant to high temperature, after the backwashing mode ends and before the water production mode, the water purification system is switched to the cooling mode. The first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state. The normal temperature or low temperature tap water enters the water inlet pipeline and then flows to the first pipeline. After passing through the first pipeline, it enters the post-filter from the post-filter water outlet of the post-filter, and backwashes the post-filter in the reverse direction. Then the water flows out from the post-filter water inlet and then passes through the third pipeline and enters the pre-filter from the pre-filter water outlet, and backwashes the pre-filter in the reverse direction. The water flowing out from the pre-filter water inlet finally is discharged through the drainage pipeline. Therefore, after the cooling mode, there is no hot water in the pre-filter, which can avoid damaging the fine filter element due to the hot water flowing to the fine filter element during normal water production.

[0026] In an alternative embodiment, the water purification system has a working state in which the backwashing mode and the cooling mode run alternately.

[0027] Beneficial effect: By alternately operating the backwashing mode and the cooling mode, a better regeneration effect can be achieved.

[0028] In an alternative embodiment, the first pipeline is provided with a heating component.

[0029] Beneficial effect: The heating component is externally disposed relative to the pre-filter element and the post-filter element, without affecting the replacement of the pre-filter element and the post-filter element.

[0030] In an alternative embodiment, the membrane housing of the pre-filter element and the membrane housing of the post-filter element are both provided with heating components.

[0031] Beneficial effect: A total of two heating components are provided, one of which is integrally provided with the membrane housing of the pre-filter element, and the other heating component is integrally provided with the membrane housing of the post-filter element. When the membrane housing is separated from the inner core, only the inner core can be replaced when replacing the filter element. When the membrane housing and the inner core are integrated, the entire filter element needs to be replaced during replacement.

[0032] In an alternative embodiment, the water purification system includes a water temperature detection element and a controller. The controller is communicatively connected to the water temperature detection element and the heating component. The water temperature detection element can detect the temperature of the water for backwashing the pre-filter element and the post-filter element in the backwashing mode, and can adjust the power of the heating component according to the temperature of the water for backwashing the pre-filter element and the post-filter element.

[0033] Beneficial effect: Different temperature thermal regeneration modes can be achieved by adjusting the power of the heating component.

[0034] In an alternative embodiment, the first pipeline switching structure includes a first three-way valve provided at the connection point of the first pipeline and the water inlet pipeline.

[0035] 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 communicated with the water inlet of the pre-filter element and the second state in which the water inlet pipeline is communicated with the first pipeline can be achieved. The structure is simple and easy to control.

[0036] In an alternative embodiment, the second pipeline is connected to the fourth pipeline. The second pipeline switching structure includes a second three-way valve provided at the connection point of the second pipeline and the fourth pipeline.

[0037] 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 pure water outlet is communicated with the water inlet of the post-filter element and the fourth state in which the water inlet of the post-filter element is communicated with the water outlet of the pre-filter element can be achieved. The structure is simple and easy to control.

[0038] In an alternative embodiment, the first pipeline is connected to the water outlet pipeline, and the third pipeline switching structure includes a third three-way valve provided at the connection point between the first pipeline and the water outlet pipeline.

[0039] Advantageous effects: The third pipeline switching 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 is communicated with the water intake port and the sixth state in which the first pipeline is communicated with the water outlet of the post-filter can be achieved. The structure is simple and convenient to control.

[0040] In an alternative embodiment, a third switching valve is provided on the third pipeline. In the water production mode, the third switching valve is opened, and in the reverse flushing mode, the third switching valve is closed.

[0041] Advantageous effects: When in the water production mode, the third switching valve is opened, and the water filtered by the pre-filter flows out from the water outlet of the pre-filter and then can flow to the fine filter. When in the reverse flushing mode, the third switching valve is closed, which can prevent the hot water in the second pipeline from flowing to the fine filter.

[0042] In an alternative embodiment, the water purification system further 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 communicated with the tap water inlet, and the coarse filter element water outlet is connected to the pre-filter water inlet through the water inlet pipeline.

[0043] Advantageous effects: By providing the coarse filter element, when in the water production mode, the tap water is first filtered by the coarse filter element and then enters the pre-filter for filtration. When in the reverse flushing mode, the tap water is first filtered by the coarse filter element and then flows through the first pipeline to the post-filter, which can avoid the impurities in the tap water from contaminating the post-filter and the pre-filter during the reverse flushing mode. Description of the Drawings

[0044] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 Schematic diagram of a water purification system according to an embodiment of the present invention when the heating component is externally disposed relative to the pre-filter and the post-filter;

[0046] Figure 2 Schematic diagram of a water purification system according to an embodiment of the present invention when the heating component is internally disposed relative to the pre-filter and the post-filter;

[0047] Figure 3 is Figure 1 a schematic diagram of the water purification system shown when it is in the water production mode;

[0048] Figure 4 is Figure 2 a schematic diagram of the water purification system shown when it is in the water production mode;

[0049] Figure 5 is Figure 1 a schematic diagram of the water purification system shown when it is in the backwashing mode or the cooling mode;

[0050] Figure 6 is Figure 2 a schematic diagram of the water purification system shown when it is in the backwashing mode or the cooling mode.

[0051] Explanation of reference numerals:

[0052] 1. Pre-filter; 101. Pre-filter water inlet; 102. Pre-filter water outlet; 2. Fine filter element; 201. Fine filter element water inlet; 202. Pure water outlet; 203. Waste water outlet; 3. Post-filter; 301. Post-filter water inlet; 302. Post-filter water outlet; 4. Tap water inlet; 5. Water inlet pipeline; 6. Drainage pipeline; 7. First switch valve; 8. Third pipeline; 9. Fourth pipeline; 10. Second pipeline; 11. Water intake port; 12. Water outlet pipeline; 13. First pipeline; 14. Booster pump; 15. Second switch valve; 16. Heating component; 17. First three-way valve; 18. Second three-way valve; 19. Third three-way valve; 20. Coarse filter element; 2001. Coarse filter element water inlet; 2002. Coarse filter element water outlet; 21. Concentrated water pipeline; 22. Waste water solenoid valve; 23. Third switch valve. Detailed implementation manners

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in 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. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0054] To achieve the goal of long service life and less filter element replacement of the water purifier, in the industry, to extend the service life of the carbon filter element, mainly by improving the carbon material, manufacturing process, and increasing the carbon usage, can all improve the water purification performance and service life to a certain extent, but there are always failure points, and it is necessary to find a breakthrough to improve the service life of the activated carbon filter element.

[0055] After investigation, the process of activated carbon adsorbing pollutants mainly includes physical adsorption and chemical adsorption. Physical adsorption is the main adsorption process that occurs in activated carbon. By changing the conditions, the adsorption equilibrium can be broken, and the adsorbate can be desorbed. The chemical adsorption process is irreversible. Essentially, it is the formation of a stable complex between the functional groups on the surface of activated carbon and pollutant molecules. In the specific process, activated carbon mainly relies on physical adsorption first. When the physical adsorption approaches saturation, chemical adsorption intervenes, and it directly fails completely. In view of the above characteristics, finding a way to break the balance between activated carbon and the adsorbate, making the physical adsorption proceed in the reverse direction, and at the same time slowing down the reaction process of chemical adsorption, so that the activated carbon can be regenerated and its adsorption capacity can be restored, can achieve the purpose of extending the service life.

[0056] After research, the methods for extending the life of carbon filters through regeneration mainly include physical high temperature, steam or vibration, and chemical reagents. For example, Patent CN217350956U discloses a self-cleaning purification device that realizes the regeneration of activated carbon fibers through high-temperature steam. However, this method is applicable to large-scale purification treatment devices in the petrochemical and environmental protection industries, with high process implementation requirements and is not suitable for household water purifiers. Patent CN113788554A discloses a method for dredging the gaps of activated carbon through water vapor, vibration, and physical impact to restore its adsorption capacity, which can achieve the self-completion of the regeneration process. However, not only is the implementation device complex, but also additional flocculants need to be added, and the safety of the use process and drinking water cannot be guaranteed. Patent CN202654783U discloses a high-efficiency activated carbon fiber filter device that realizes the regeneration of the filter element through soaking in chlorine dioxide and high-temperature steam. However, introducing the chemical substance chlorine dioxide cannot guarantee the safety of water quality. Patent CN101844075A discloses a device and method for regenerating activated carbon. Through an electrochemical method, the pollutants adsorbed on the activated carbon are decomposed and reduced in the electrolytic state and then desorbed to achieve the regeneration of activated carbon. However, the precipitation of metal substances in the solution cannot guarantee the safety of drinking water and increases the power consumption.

[0057] Moreover, small volume is the current main development trend in the market, and low cost helps to enhance the competitiveness of products. Through the above analysis, it is necessary to find a more effective general technology for the life of carbon filters. The purpose of this embodiment is to solve the problems of short carbon filter life and frequent filter element replacement, improve the life of the carbon filter, and at the same time meet the requirements of energy conservation and environmental protection and enhance the competitiveness of products.

[0058] The following combines Figures 1 to 6 , to describe the embodiments of the present invention.

[0059] According to an embodiment of the present invention, on the one hand, a water purification system is provided, including a water production device and a reverse flushing pipeline.

[0060] Among them, the water production device includes a water production pipeline and a pre-filter 1 and a post-filter 3 connected in series to the water production pipeline in sequence. The pre-filter 1 and the post-filter 3 include carbon water purification units. The pre-filter 1 has a pre-filter water inlet 101 and a pre-filter water outlet 102, and the post-filter 3 has a post-filter water inlet 301 and a post-filter water outlet 302; a reverse flushing pipeline, including a first pipeline 13 connected in parallel between the pre-filter water inlet 101 and the post-filter water outlet 302, and a second pipeline 10 connected in parallel between the post-filter water inlet 301 and the pre-filter water outlet 102; when the water purification system executes the reverse flushing mode, hot water sequentially flows through the first pipeline 13, the post-filter water outlet 302, the post-filter 3, the post-filter water inlet 301, the second pipeline 10, the pre-filter water outlet 102, the pre-filter 1 and the pre-filter water inlet 101.

[0061] In this embodiment, when the water purification system produces water normally, tap water is used to produce water through the water production pipeline at this time. After the pre-filter and the post-filter are used for a period of time and adsorb more impurities, the water purification system is switched to the reverse flushing mode, and the pre-filter and the post-filter can be reversely flushed. Hot water sequentially flows through the first pipeline, the post-filter water outlet, the post-filter, the post-filter water inlet, the second pipeline, the pre-filter water outlet, the pre-filter and the pre-filter water inlet. Hot water enters the post-filter from the post-filter water outlet and reversely flushes the post-filter. The carbon water purification unit includes activated carbon. Hot water can break the balance between the activated carbon and the pollution adsorbents, so that the pollutants are desorbed, and the impurities adsorbed by the post-filter can be effectively stripped and removed, so that the activated carbon in the post-filter can recover part of its adsorption capacity and realize regeneration. Then, after the water flows out from the post-filter water inlet and passes through the second pipeline and enters the pre-filter from the pre-filter water outlet, hot water can break the balance between the activated carbon and the pollution adsorbents, so that the pollutants are desorbed, and the pre-filter is reversely flushed, and the impurities adsorbed by the pre-filter can be effectively stripped and removed, so that the activated carbon in the pre-filter can recover part of its adsorption capacity and realize regeneration.

[0062] Therefore, this water purification system can reversely flush the pre-filter and the post-filter, extend the service life of the pre-filter and the post-filter, extend the replacement cycle, and does not need to be replaced frequently. Compared with the related technology, the cost is lower, and it can ensure the safety of water use. The regeneration process of the carbon water purification units in the pre-filter and the post-filter is safe and simple.

[0063] Specifically, in one embodiment, the pre-filter water inlet 101 is connected to a water inlet pipeline 5 communicating with the tap water inlet 4, and the pre-filter water inlet 101 is also connected to a drainage pipeline 6, and the drainage pipeline 6 is provided with a first on-off valve 7.

[0064] The fine filter element 2 of the water production device has a fine filter element water inlet 201, a pure water outlet 202, and a wastewater outlet 203. The fine filter element water inlet 201 is connected to the outlet 102 of the pre-filter through the third pipeline 8.

[0065] The post-filter 3 has a post-filter water inlet 301 and a post-filter water outlet 302. The post-filter water inlet 301 is connected to the pure water outlet 202 through the fourth pipeline 9, the post-filter water inlet 301 is connected to the outlet 102 of the pre-filter through the second pipeline 10, and the post-filter water outlet 302 is connected to the water intake 11 through the water outlet pipeline 12.

[0066] The first pipeline 13 connects the post-filter water outlet 302 and the water inlet pipeline 5.

[0067] The water purification system further includes a first pipeline switching structure, a second pipeline switching structure, and a third pipeline switching structure. The first pipeline switching structure has a first state in which the water inlet pipeline 5 is connected to the pre-filter water inlet 101 and a second state in which the water inlet pipeline 5 is connected to the first pipeline 13. The second pipeline switching structure has a third state in which the pure water outlet 202 is connected to the post-filter water inlet 301 and a fourth state in which the post-filter water inlet 301 is connected to the outlet 102 of the pre-filter. The third pipeline switching structure has a fifth state in which the post-filter water outlet 302 is connected to the water intake 11 and a sixth state in which the first pipeline 13 is connected to the post-filter water outlet 302.

[0068] 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, and the third pipeline switching structure is in the fifth state; when the water purification system executes the reverse flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state to reverse flush the pre-filter 1 and the post-filter 3, and the water for reverse flushing the pre-filter 1 and the post-filter 3 is hot water.

[0069] In this embodiment, when the water purification system produces water normally, such as Figure 3 and Figure 4, in the figure, the thick lines indicate the water flow direction. The first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, and the third pipeline switching structure is in the fifth state. The first switching valve 7 is closed. At this time, tap water enters the pre-filter 1 through the pre-filter water inlet 101, and after being filtered by the pre-filter 1, it flows out from the pre-filter water outlet 102, and then enters the fine filter 2 through the third pipeline 8 for filtration. The pure water formed after being filtered by the fine filter 2 flows out from the pure water outlet 202, flows into the post-filter 3 through the fourth pipeline 9, and can be supplied to users for drinking after being filtered again by the post-filter 3. After the pre-filter 1 and the post-filter 3 have been used for a period of time and adsorbed a large amount of impurities, the water purification system is switched to the reverse flushing mode, and the pre-filter 1 and the post-filter 3 can be reversely flushed. When the water purification system is in the reverse flushing mode, as Figure 5 and Figure 6 , in the figure, the thick lines indicate the water flow direction. The first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state. At this time, water enters the water inlet pipeline 5 and then flows to the first pipeline 13. After passing through the first pipeline 13, it enters the post-filter 3 from the post-filter water outlet 302 of the post-filter 3 to reversely flush the post-filter 3. Since the water for reversely flushing the post-filter 3 is hot water, the impurities adsorbed by the post-filter 3 can be effectively stripped and removed. Then the water flows out from the post-filter water inlet 301 and enters the pre-filter 1 through the second pipeline 10 from the pre-filter water outlet 102 to reversely flush the pre-filter 1. Since the water for reversely flushing the pre-filter 1 is hot water, the impurities adsorbed by the pre-filter 1 can be effectively stripped and removed. The flushing water with impurities flows out from the pre-filter 1 inlet and is discharged from the drainage pipeline 6.

[0070] Therefore, the water purification system can reversely flush the pre-filter 1 and the post-filter 3, extend the service life of the pre-filter 1 and the post-filter 3, do not need to be replaced frequently, and compared with the related technology, the cost is lower, and the water use safety can be ensured.

[0071] It should be noted that the pre-filter 1 is used to remove organic matters, colloids, heavy metals, sediment particles, etc., and has various embodiments. For example, it is composed of a series connection of a first-stage PP cotton or ultrafiltration and a first-stage pre-activated carbon filter, or directly a composite filter in the form of a first-stage PCB, etc.; the post-filter 3 is mostly a post-activated carbon filter, which can be located before or after the pure water outlet part, and is the last stage in the water purification system, and is used to remove trace elements, adjust the pH and drinking taste, etc.; the fine filter 2 is mainly composed of an RO membrane, which is the core component of the water purification system, has extremely high purification accuracy, and can filter out all impurities except water molecules.

[0072] It should be noted that since the water processed by the post-filter 3 is the water that has been multi-filtered by the pre-filter 1 and the fine filter 2, the impurities adsorbed by the post-filter 3 are not particularly many. Therefore, during the reverse flushing mode, the water first reversely flushes the post-filter 3, and the water flowing out from the water inlet 301 of the post-filter 3 then flows to the pre-filter 1 to reversely flush the pre-filter 1, which will not affect the reverse flushing effect of the pre-filter 1.

[0073] It should be noted that since the fine filter 2 is usually not resistant to high temperature, when the pre-filter 1 and the post-filter 3 are reversely flushed in this embodiment, the fine filter 2 is avoided to prevent damage to the fine filter 2.

[0074] It should be noted that the water purification system further includes pumps (not all shown in the figure), and the pumps are mainly the booster pump 14 and the water extraction pump. The booster pump 14 is used for boosting and controlling the opening and closing of the entire water purification system.

[0075] For the program control of the opening and closing of each component and the operation of the whole machine, the start and stop of the booster pump 14, the power of the heating component 16, and the opening and closing of the pipeline control valve are mainly controlled according to relevant detection parameters (such as the purified water volume, time, water temperature, liquid level, etc.) to achieve the switching of each mode. Since the focus of this embodiment is on reversely flushing the pre-filter 1 and the post-filter 3 with hot water, the specific program control does not belong to the focus of this embodiment and will not be introduced in detail in this embodiment.

[0076] In one embodiment, the water inlet pipeline 5 is provided with a second switch valve 15, and the water purification system further has a soaking mode. When the water purification system executes the soaking mode, the first switch valve 7 and the second switch valve 15 are closed.

[0077] In this embodiment, during the reverse flushing mode, first make the first pipeline switching structure in the second state, the second pipeline switching structure in the fourth state, and the third pipeline switching structure in the sixth state. After the hot water fully enters the post-filter 3 and the pre-filter 1, close the first switch valve 7 and the second switch valve 15. At this time, the hot water fully soaks the post-filter 3 and the pre-filter 1, so that the impurities adsorbed by the post-filter 3 and the pre-filter 1 fall off. After soaking for a period of time, open the first switch valve 7 and the second switch valve 15, and use the flowing hot water to reversely flush the post-filter 3 and the pre-filter 1, and the flushing water is discharged through the drainage pipeline 6. The reverse flushing effect of the post-filter 3 and the pre-filter 1 can be further improved.

[0078] In one embodiment, the water purification system further has a cooling mode. When the water purification system executes the cooling mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state, and the pre-filter 1 and the post-filter 3 are reversely flushed, and the water for reversely flushing the pre-filter 1 and the post-filter 3 is cold water.

[0079] In this embodiment, since the water for backwashing the pre-filter 1 and the post-filter 3 is hot water during the backwashing mode, and the fine filter element 2 is usually not resistant to high temperatures, after the backwashing mode ends and before the water production mode, the water purification system is switched to the cooling mode. The first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state. Normal temperature or low-temperature tap water enters the water inlet pipeline 5 and then flows to the first pipeline 13. After passing through the first pipeline 13, it enters the post-filter 3 from the post-filter water outlet 302 of the post-filter 3 to backwash the post-filter 3. After that, the water flows out from the post-filter water inlet 301 and then enters the pre-filter 1 from the pre-filter water outlet 102 through the second pipeline 10 to backwash the pre-filter 1. The water flowing out from the pre-filter water inlet 101 finally drains out through the drain pipeline 6. Therefore, after the cooling mode, there is no hot water in the pre-filter 1, which can avoid damaging the fine filter element 2 when hot water flows to the fine filter element 2 during normal water production.

[0080] It should be noted that the backwashing mode specifically includes various forms such as running water flushing, soaking, long-time flushing, short-time flushing, etc., and the backwashing mode and the cooling mode can be alternately operated to obtain the best regeneration effect.

[0081] Among them, the hot water temperature for backwashing and soaking the pre-filter 1 and the post-filter 3 in the backwashing mode is greater than the ambient temperature and less than the boiling point of water.

[0082] In one embodiment, the first pipeline 13 is provided with a heating component 16.

[0083] In this embodiment, the heating component 16 is externally disposed relative to the pre-filter 1 and the post-filter 3, without affecting the replacement of the pre-filter 1 and the post-filter 3.

[0084] 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 third pipeline switching structure is in the fifth state, and the first switching valve 7 is closed. At this time, tap water enters the pre-filter 1 through the pre-filter water inlet 101, flows out from the pre-filter water outlet 102 after being filtered by the pre-filter 1, then enters the fine filter 2 through the third pipeline 8 for filtration, and the pure water formed after being filtered by the fine filter 2 flows out from the pure water outlet 202, flows into the post-filter 3 through the fourth pipeline 9, and can be supplied to users for drinking after being filtered again by the post-filter 3. After the pre-filter 1 and the post-filter 3 have adsorbed a large amount of impurities after being used for a period of time, the water purification system is switched to the reverse flushing mode to reverse flush the pre-filter 1 and the post-filter 3. When the water purification system is in the reverse flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state. At this time, after water enters the water inlet pipeline 5, it flows to the first pipeline 13, is heated by the components on the first pipeline 13, and then enters the post-filter 3 from the post-filter water outlet 302 of the post-filter 3 to reverse flush the post-filter 3. Since the water for reverse flushing the post-filter 3 is hot water, the impurities adsorbed by the post-filter 3 can be effectively stripped and removed. Then the water flows out from the post-filter water inlet 301, enters the pre-filter 1 from the pre-filter water outlet 102 through the second pipeline 10 to reverse flush the pre-filter 1. Since the water for reverse flushing the pre-filter 1 is hot water, the impurities adsorbed by the pre-filter 1 can be effectively stripped and removed. The flushing water with impurities flows out from the pre-filter 1 inlet and is discharged through the drain pipeline 6.

[0085] The heating component 16 can be a stainless steel heating pipe, an electric heating wire, etc., and can quickly heat up to the specified temperature by generating heat.

[0086] In one embodiment, heating components 16 are provided on both the membrane housing of the pre-filter 1 and the membrane housing of the post-filter 3.

[0087] In this embodiment, a total of two heating components 16 are provided. One heating component 16 is integrally provided with the membrane housing of the pre-filter 1, and the other heating component 16 is integrally provided with the membrane housing of the post-filter 3. When the membrane housing is separated from the inner core, only the inner core can be replaced when replacing the filter element. When the membrane housing and the inner core are integrated, the entire filter element needs to be replaced during replacement.

[0088] 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, and the third pipeline switching structure is in the fifth state. The first switching valve 7 is closed. At this time, tap water enters the pre-filter 1 through the pre-filter water inlet 101. After being filtered by the pre-filter 1, it flows out from the pre-filter water outlet 102, and then enters the fine filter 2 through the third pipeline 8 for filtration. The pure water formed after being filtered by the fine filter 2 flows out from the pure water outlet 202 and flows into the post-filter 3 through the fourth pipeline 9. After being filtered again by the post-filter 3, it can be supplied for users to drink. When the pre-filter 1 and the post-filter 3 have adsorbed a large amount of impurities after being used for a period of time, the water purification system is switched to the reverse flushing mode, and the pre-filter 1 and the post-filter 3 can be reversely flushed. When the water purification system is in the reverse flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state. At this time, after water enters the water inlet pipeline 5, it flows to the first pipeline 13. After passing through the first pipeline 13, it enters the post-filter 3 from the post-filter water outlet 302 of the post-filter 3 to reversely flush the post-filter 3. Since the membrane housing of the post-filter 3 is provided with a heating component 16, the heating component 16 can heat the water for reversely flushing the post-filter 3 to be hot water. Therefore, the impurities adsorbed by the post-filter 3 can be effectively stripped and removed. Then the water flows out from the post-filter water inlet 301 and enters the pre-filter 1 from the pre-filter water outlet 102 through the second pipeline 10. Since the membrane housing of the pre-filter 1 is provided with a heating component 16, the heating component 16 can heat the water for reversely flushing the pre-filter 1 to be hot water. Therefore, the impurities adsorbed by the pre-filter 1 can be effectively stripped and removed. The flushing water with impurities flows out from the pre-filter 1 inlet and is discharged from the drain pipeline 6.

[0089] In one embodiment, the water purification system includes a water temperature detection element and a controller. The controller is communicatively connected to the water temperature detection element and the heating component 16. The water temperature detection element can detect the temperature of the water for reversely flushing the pre-filter 1 and the post-filter 3 in the reverse flushing mode, and can adjust the power of the heating component 16 according to the temperature of the water for reversely flushing the pre-filter 1 and the post-filter 3.

[0090] In this embodiment, different temperature reverse flushing modes can be achieved by adjusting the power of the heating component 16.

[0091] In one embodiment, the first pipeline switching structure includes a first three-way valve 17 provided at the connection point between the first pipeline 13 and the water inlet pipeline 5.

[0092] In this embodiment, the first pipeline switching structure is the first three-way valve 17. By controlling the first three-way valve 17, the first state in which the water inlet pipeline 5 is communicated with the pre-filter water inlet 101 and the second state in which the water inlet pipeline 5 is communicated with the first pipeline 13 can be realized. The structure is simple and easy to control.

[0093] Specifically, the first three-way valve 17 has a first port near the tap water inlet 4, a second port near the pre-filter 1, and a third port connected to the first pipeline 13. When the first port is in communication with the second port, it is in the first state, and when the first port is in communication with the third port, it is in the second state. Specifically, in the water production mode, the first three-way valve 17 switches to the first state where the first port and the second port are in communication. In the backwashing mode and the cooling mode, the first three-way valve 17 switches to the second state where the first port and the third port are in communication.

[0094] In an embodiment not shown in the figure, the first pipeline switching structure may include on-off valves respectively provided on the first pipeline 13 and the water inlet pipeline 5 and near the pre-filter 1, and the switching of different states of the first pipeline switching structure is achieved by controlling the on-off of these two on-off valves.

[0095] In an embodiment, the second pipeline 10 is connected to the fourth pipeline 9, and the second pipeline switching structure includes a second three-way valve 18 provided at the connection point of the second pipeline 10 and the fourth pipeline 9.

[0096] In this embodiment, the second pipeline switching structure is the second three-way valve 18. By controlling the second three-way valve 18, the third state where the pure water port 202 is in communication with the water inlet of the post-filter 301 and the fourth state where the water inlet of the post-filter 301 is in communication with the water outlet of the pre-filter 102 can be achieved. The structure is simple and easy to control.

[0097] Specifically, the second three-way valve 18 has a fourth port near the pure water end, a fifth port near the post-filter 3, and a sixth port connected to the second pipeline 10. When the fourth port is in communication with the fifth port, it is in the third state, and when the fifth port is in communication with the sixth port, it is in the fourth state. Specifically, in the water production mode, the second three-way valve 18 switches to the third state where the fourth port and the fifth port are in communication. In the backwashing mode and the cooling mode, the second three-way valve 18 switches to the fourth state where the fifth port and the sixth port are in communication.

[0098] In an embodiment not shown in the figure, the second pipeline switching structure may include on-off valves respectively provided on the fourth pipeline 9 and the second pipeline 10, and the switching of different states of the second pipeline switching structure is achieved by controlling the on-off of these two on-off valves.

[0099] In an embodiment, the first pipeline 13 is connected to the water outlet pipeline 12, and the third pipeline switching structure includes a third three-way valve 19 provided at the connection point of the first pipeline 13 and the water outlet pipeline 12.

[0100] In this embodiment, the third pipeline switching structure is the third three-way valve 19. By controlling the third three-way valve 19, the fifth state in which the water outlet 302 of the post-filter is connected to the water intake 11 and the sixth state in which the first pipeline 13 is connected to the water outlet 302 of the post-filter can be achieved. The structure is simple and easy to control.

[0101] Specifically, the third three-way valve 19 has a seventh port close to the post-filter 3, an eighth port close to the water intake 11, and a ninth port connected to the first pipeline 13. When the seventh port is connected to the eighth port, it is the fifth state. When the ninth port is connected to the seventh port, it is the sixth state. Specifically, in the water production mode, the third three-way valve 19 switches to the fifth state in which the seventh port is connected to the eighth port. In the reverse flushing mode and the cooling mode, the third three-way valve 19 switches to the sixth state in which the ninth port is connected to the seventh port.

[0102] In one embodiment, the third pipeline 8 is provided with a third switching valve 23. In the water production mode, the third switching valve 23 is opened. In the reverse flushing mode, the third switching valve 23 is closed.

[0103] In this embodiment, in the water production mode, when the third switching valve 23 is opened, the water filtered by the pre-filter 1 flows out from the pre-filter water outlet 102 and can flow to the fine filter 2. In the reverse flushing mode, when the third switching valve 23 is closed, the hot water in the second pipeline 10 can be blocked from flowing to the fine filter 2.

[0104] In one embodiment, the water purification system further includes a coarse filter element 20. The coarse filter element 20 has a coarse filter element water inlet 2001 and a coarse filter element water outlet 2002. The coarse filter element water inlet 2001 is connected to the tap water inlet 4, and the coarse filter element water outlet 2002 is connected to the pre-filter water inlet 101 through a water inlet pipeline 5.

[0105] In this embodiment, by providing the coarse filter element 20, in the water production mode, the tap water is first filtered by the coarse filter element 20 and then enters the pre-filter 1 for filtration. In the reverse flushing mode, the tap water is first filtered by the coarse filter element 20 and then flows through the first pipeline 13 to the post-filter 3, which can avoid the impurities in the tap water from contaminating the post-filter 3 and the pre-filter 1 in the reverse flushing mode.

[0106] In one embodiment, the waste water outlet 203 is connected to a concentrated water pipeline 21, and the concentrated water pipeline 21 is provided with a waste water solenoid valve 22.

[0107] In this embodiment, in the water production mode, the pure water filtered by the fine filter 2 flows to the post-filter 3, and the concentrated water generated by filtration is discharged through the concentrated water pipeline 21.

[0108] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A water purification system, characterized in that, Comprising: A water production device, including a water production pipeline and a pre-filter (1) and a post-filter (3) connected in series to the water production pipeline in sequence. The pre-filter (1) and the post-filter (3) include carbon water purification units. The pre-filter (1) has a pre-filter water inlet (101) and a pre-filter water outlet (102), and the post-filter (3) has a post-filter water inlet (301) and a post-filter water outlet (302); A reverse flushing pipeline, including a first pipeline (13) connected in parallel between the pre-filter water inlet (101) and the post-filter water outlet (302), and a second pipeline (10) connected in parallel between the post-filter water inlet (301) and the pre-filter water outlet (102); When the water purification system executes the reverse flushing mode, hot water flows through the first pipeline (13), the post-filter water outlet (302), the post-filter (3), the post-filter water inlet (301), the second pipeline (10), the pre-filter water outlet (102), the pre-filter (1), and the pre-filter water inlet (101) in sequence; The pre-filter water inlet (101) is connected to a water inlet pipeline (5) communicating with a tap water inlet (4), and the pre-filter water inlet (101) is also connected to a drainage pipeline (6). The drainage pipeline (6) is provided with a first switching valve (7); The water production device further includes a fine filter (2). The fine filter (2) has a fine filter water inlet (201), a pure water outlet (202), and a waste water outlet (203). The fine filter water inlet (201) is communicated with the pre-filter water outlet (102) through a third pipeline (8); The post-filter water inlet (301) is connected to the pure water outlet (202) through a fourth pipeline (9), and the post-filter water outlet (302) is connected to a water intake port (11) through a water outlet pipeline (12); The first pipeline (13) communicates the post-filter water outlet (302) with the water inlet pipeline (5); The water purification system further includes: A first pipeline switching structure having a first state in which the water inlet pipeline (5) is communicated with the pre-filter water inlet (101) and a second state in which the water inlet pipeline (5) is communicated with the first pipeline (13); A second pipeline switching structure having a third state in which the pure water outlet (202) is communicated with the post-filter water inlet (301) and a fourth state in which the post-filter water inlet (301) is communicated with the pre-filter water outlet (102); A third pipeline switching structure having a fifth state in which the post-filter water outlet (302) is communicated with the water intake port (11) and a sixth state in which the first pipeline (13) is communicated with the post-filter water outlet (302); 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, and the third pipeline switching structure is in the fifth state; When the water purification system executes the reverse flushing mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state, to reverse flush the pre-filter (1) and the post-filter (3), and the water for reverse flushing the pre-filter (1) and the post-filter (3) is hot water, and the hot water does not pass through the fine filter (2).

2. The water purification system according to claim 1, wherein, The water inlet pipeline (5) is provided with a second switch valve (15), and the water purification system further has a soaking mode. When the water purification system executes the soaking mode, the first switch valve (7) and the second switch valve (15) are closed.

3. The water purification system according to claim 1, characterized in that, The water purification system further has a cooling mode. When the water purification system executes the cooling mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the third pipeline switching structure is in the sixth state, to reverse flush the pre-filter (1) and the post-filter (3), and the water for reverse flushing the pre-filter (1) and the post-filter (3) is cold water.

4. The water purification system according to claim 3, characterized in that, The water purification system has a working state in which the reverse flushing mode and the cooling mode operate alternately.

5. The water purification system according to any one of claims 1 to 4, characterized in that, The first pipeline (13) is provided with a heating component (16); Alternatively, the membrane housings of the pre-filter (1) and the post-filter (3) are both provided with heating components (16).

6. The water purification system according to claim 5, characterized in that, The water purification system includes a water temperature detection element and a controller. The controller is communicatively connected to the water temperature detection element and the heating component (16). The water temperature detection element can detect the temperature of the water for reverse flushing the pre-filter (1) and the post-filter (3) in the reverse flushing mode, and can adjust the power of the heating component (16) according to the temperature of the water for reverse flushing the pre-filter (1) and the post-filter (3).

7. The water purification system according to any one of claims 1 to 4, characterized in that, The first pipeline switching structure includes a first three-way valve (17) provided at the connection point of the first pipeline (13) and the water inlet pipeline (5).

8. The water purification system according to any one of claims 1 to 4, characterized in that, The second pipeline (10) is connected to the fourth pipeline (9), and the second pipeline switching structure includes a second three-way valve (18) provided at the connection point of the second pipeline (10) and the fourth pipeline (9).

9. The water purification system according to any one of claims 1 to 4, characterized in that, The first pipeline (13) is connected to the water outlet pipeline (12), and the third pipeline switching structure includes a third three-way valve (19) provided at the connection point of the first pipeline (13) and the water outlet pipeline (12).

10. The water purification system according to any one of claims 1 to 4, characterized in that, The third pipeline (8) is provided with a third switch valve (23). In the water production mode, the third switch valve (23) is open, and in the reverse flushing mode, the third switch valve (23) is closed.

11. The water purification system according to any one of claims 1 to 4, characterized in that, The water production device further includes a coarse filtration filter element (20), the coarse filtration filter element (20) has a coarse filtration filter element water inlet (2001) and a coarse filtration filter element water outlet (2002), the coarse filtration filter element water inlet (2001) is communicated with the tap water inlet (4), and the coarse filtration filter element water outlet (2002) is connected to the pre-filter element water inlet (101) through the water inlet pipeline (5).

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