Water purification system and water production control method thereof

Abstract

The present application relates to the technical field of water purification, and discloses a water purification system and a water production control method thereof. The system comprises a water production pipeline, a forward flushing pipeline and a reverse flushing pipeline. The forward flushing pipeline comprises the water production pipeline located upstream of a pre-filter and a flushing water discharge pipeline connected at a pre-filter water outlet. Along the water flow direction in the reverse flushing pipeline, the reverse flushing pipeline is connected in series with a heating device and a post-filter. A control valve group is arranged on the water production pipeline, the flushing water discharge pipeline and the reverse flushing pipeline, and is adapted to switch and control the water production pipeline, the forward flushing pipeline and / or the reverse flushing pipeline. The pre-filter and the post-filter are flushed by hot water, which not only has the effect of flushing, but also breaks the balance between the carbon and the adsorbed pollutants, so that the pollutants are desorbed, the carbon filter is partially restored to the adsorption capacity, and regeneration is achieved. Moreover, the method is relatively safe and simple.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, specifically to a water purification system and its water production control method. Background Technology

[0002] Tap water inevitably contains contaminants such as rust, sediment, organic matter, and microorganisms during its transportation through pipe networks. With increasing public concern about water safety, water purifiers with purification functions are gaining market acceptance. A typical water purifier system includes pre-treatment filters, precision filters, and post-treatment filters. Pre-treatment filters remove organic matter, colloids, heavy metals, and sediment particles; precision filters, such as RO membrane filters, offer extremely high precision and are the core of the purification system; post-treatment filters remove trace elements, adjust pH, and improve drinking taste.

[0003] Carbon filter cartridges are an indispensable component of pre-treatment and post-treatment filters in water purifiers because they can effectively adsorb impurities and remove oxidizing substances such as residual chlorine. However, during long-term operation, bacteria and biofilm may grow on the surface of carbon filter cartridges, leading to a decline in water purification performance and even contaminating the purified water, thus affecting the lifespan of the carbon filter cartridge. Currently, most pre-treatment and post-treatment filters in drinking water purification systems are disposable consumables that are discarded and replaced when their lifespan expires. This not only causes huge waste and environmental pollution, but also frequent replacement of carbon filter cartridges can be inconvenient for users and increase operating costs. Summary of the Invention

[0004] In view of this, the present invention provides a water purification system and a water production control method thereof to solve the problem of short lifespan and frequent replacement of carbon filter cartridges in existing water purification systems.

[0005] In a first aspect, the present invention provides a water purification system, comprising:

[0006] The water production pipeline is connected in series with a pre-filter, a post-filter, a pure water storage device, and a heating device.

[0007] Along the water flow direction in the water production pipeline, the pre-filter is sequentially provided with a pre-inlet and a pre-outlet, and the post-filter is sequentially provided with a post-inlet and a post-outlet. The heating device is connected to the pure water storage device and is suitable for selectively heating pure water from the pure water storage device. Both the pre-filter and the post-filter include a carbon water purification unit.

[0008] The forward flushing pipeline includes a water supply pipeline located upstream of the pre-filter and a flushing water discharge pipeline connected to the pre-outlet of the pre-filter. A heating unit is provided on the water supply pipeline upstream of the pre-filter and / or inside the pre-filter. The heating unit is adapted to heat the water used for flushing the pre-filter. The water entering from the water supply pipeline upstream of the pre-filter is discharged through the flushing water discharge pipeline after forward flushing the pre-filter.

[0009] The reverse flushing pipeline, along the water flow direction in the reverse flushing pipeline, connects the heating device, the rear outlet, the rear filter element, and the rear inlet in sequence. The reverse flushing pipeline is adapted to reverse the flow of hot water from the heating device into the rear filter element to flush the rear filter element and then discharge it from the rear inlet.

[0010] The control valve assembly is installed on the water production pipeline, the flushing water discharge pipeline, and the backflushing pipeline, and is suitable for switching the flow of the water production pipeline or controlling the flow of the forward flushing pipeline and / or controlling the flow of the backflushing pipeline.

[0011] Beneficial effects: When the water purification system starts the regeneration mode, the control valve assembly can open the water supply line located upstream of the pre-filter to supply a set amount of flushing water to the pre-filter. Then, the control valve assembly closes the water supply line and opens the forward flushing line. The heating unit starts heating the water used to flush the pre-filter and drives the flushing water in the forward flushing line to flow, thereby realizing the forward flushing of the pre-filter with hot water. This achieves effective regeneration of the activated carbon, improves the service life of the pre-filter, and avoids the trouble and increased operating costs caused by frequent filter replacement.

[0012] In addition, when the water purification system starts the regeneration mode, the control valve group can also open the back flushing pipeline, allowing hot water from the heating device to enter the post-filter cartridge, thereby back flushing the post-filter cartridge. The deposits on the post-filter cartridge can be effectively peeled off and removed in the reverse hot water flow, realizing the effective regeneration of the post-filter cartridge, improving the service life of the filter cartridge, and avoiding frequent filter cartridge replacement.

[0013] This invention uses hot water to flush the pre-filter and post-filter, which not only has a flushing effect, but also the hot water can disrupt the balance between the carbon and the adsorbed pollutants, causing the pollutants to desorb and thus restore some of the adsorption capacity of the carbon filter, achieving regeneration. Moreover, it is relatively safe and convenient.

[0014] In one alternative embodiment, a heating unit is provided on the water supply line upstream of the pre-filter and / or inside the pre-filter, the heating unit being adapted to selectively heat the water used to rinse the pre-filter.

[0015] Beneficial effects: The heating unit heats the rinsing water used to clean the pre-filter, turning it into hot water. Rinsing or soaking the pre-filter with hot water makes it easier to remove impurities and dirt, effectively regenerating the activated carbon and further improving the removal efficiency. Furthermore, the pre-filter uses an independent heating unit for thermal regeneration, which can be activated only during pre-filter regeneration, allowing for separate and independent operation of pre-filter and post-filter thermal regeneration, providing greater flexibility.

[0016] In one alternative implementation, the control valve assembly includes:

[0017] The first switch valve is located on the water supply pipeline upstream of the pre-filter cartridge and is suitable for controlling whether water is supplied to the pre-filter cartridge.

[0018] The second switch valve is installed on the flushing water discharge pipeline and is suitable for controlling whether to discharge the flushing water in the pre-filter.

[0019] Beneficial effects: The first switch valve controls whether tap water is supplied to the pre-filter, and the second switch valve controls the opening and closing of the flushing water discharge pipe, allowing switching between water production mode and pre-filter regeneration mode. When the pre-filter regeneration mode is activated, both the first and second switch valves are opened, and the heating unit is simultaneously activated to flush the pre-filter with hot water. Alternatively, after supplying a set amount of hot water to the pre-filter, the first and second switch valves can be closed to soak the pre-filter in hot water, making it easier for dirt and impurities attached to the pre-filter to detach.

[0020] In one alternative embodiment, the backflushing line includes a drain pipe section connected to the post-inlet, and the control valve assembly includes:

[0021] A switching valve is suitable for switching the connection between the pure water storage device or heating device and the post-outlet.

[0022] The third switch valve is located on the drain section of the backflushing pipeline and is suitable for controlling the flow of water in the drain section.

[0023] Beneficial effects: In normal water production mode, the switching valve switches to the first state, connecting the post-filter outlet to the pure water storage device, allowing purified water from the post-filter to enter and be stored. When the post-filter regeneration mode is activated, the switching valve switches to the second state, connecting the heating device to the post-filter outlet. The third switching valve can selectively open or close, allowing hot water from the heating device to flow back into the post-filter for rinsing or soaking. The post-filter regeneration system shares a heat source with the drinking water purification system, and the regeneration water source is pure water. The regeneration pipeline flows in the opposite direction to the normal water production pipeline, enabling reverse flushing and regeneration of the filter. While the backflushing pipeline effectively regenerates the filter, the backflushing force also regenerates the post-filter and removes some impurities. Contaminants are effectively removed through soaking and rinsing.

[0024] In one alternative embodiment, the switching valve is a two-way valve with three ports. Two ports of the two-way valve are connected to the water supply line, and the other port of the two-way valve is connected to the backwash line.

[0025] Beneficial effects: Switching between the water production pipeline and the backwash pipeline can be completed by opening or closing the two-way valve, or between hot water flushing and normal temperature flushing. It is easier to switch between normal water production mode and backwash mode, and the structure is simpler, more reliable, and the pipeline is more simplified.

[0026] In one alternative implementation, the water supply pipeline includes:

[0027] The first pipeline is connected to the tap water inlet at one end and to the pre-inlet water inlet at the other end.

[0028] The second pipeline is connected at one end to the pre-outlet and at the other end to the post-inlet.

[0029] The third pipeline is connected at one end to the rear water outlet and at the other end to the water inlet of the pure water storage device.

[0030] The backwash pipeline includes an inlet pipe section, one end of which is connected to the hot water outlet of the heating device, and the other end is connected to a third pipeline through a switching valve.

[0031] Beneficial effects: By switching the connection between the post-filter outlet and the pure water storage device, or between the post-filter outlet and the inlet section of the backwash pipeline, the backwashing of the post-filter cartridge can be completed. By using the opposite direction of water flow during normal water production to flush the impurities and dirt attached to the post-filter cartridge, these impurities and dirt can be more easily removed, resulting in better impurity removal and regeneration of activated carbon. The switching valve can switch the direction of water flow, enabling bidirectional flow of water in the post-filter cartridge. This ensures that the water production mode and the backwashing mode of the post-filter cartridge do not affect each other. The structure is simple, reliable, and easy to implement.

[0032] In one alternative implementation, the control valve assembly further includes:

[0033] The fourth switch valve is located on the second pipeline and is suitable for controlling the flow of water between the pre-filter and the post-filter.

[0034] Beneficial effects: The fourth switch valve can control the water flow between the pre-filter and the post-filter. In normal water production mode, the second pipeline is opened. When the regeneration mode of the pre-filter is started, the fourth switch valve can close the second pipeline to prevent the hot water used to flush the pre-filter from flowing into the next filter and affecting the normal operation of the pre-filter regeneration mode or causing performance damage to the next filter.

[0035] In one alternative implementation, the water purification system further includes a precision filter cartridge connected in series in the second pipeline;

[0036] There are two fourth switching valves, one of which is located on the second pipeline between the pre-filter and the precision filter, and the other is located on the second pipeline between the precision filter and the pre-filter.

[0037] Beneficial effects: Precision filters can remove all impurities except water molecules. However, precision filters are not heat-resistant, and the hot water used for filter regeneration must bypass this stage of the filter. Therefore, a fourth switching valve is installed between the pre-filter and the precision filter. During normal water production, two of the fourth switching valves can be opened, allowing water filtered by the pre-filter to sequentially enter the precision filter and then the post-filter for further purification. During pre-filter regeneration, the fourth switching valve between the pre-filter and the precision filter is closed to prevent hot water from the pre-filter outlet from entering the precision filter and causing damage. During post-filter regeneration, the fourth switching valve between the precision filter and the post-filter is closed to prevent backwash water from flowing back into the precision filter and damaging its performance.

[0038] In one alternative implementation, a booster pump is installed on the water production pipeline upstream of the pre-filter.

[0039] Beneficial effects: The booster pump, installed on the water production pipeline, is used to pressurize the water, control the on / off state of the entire water purification system, and serve as the driving force for the circulation during the disinfection and regeneration of the pre-filter cartridge. By driving the flushing water in the forward flushing pipeline through the booster pump, the pre-filter cartridge is effectively regenerated, thus extending its service life and avoiding the inconvenience and increased operating costs associated with frequent cartridge replacements. In this embodiment, the same booster pump can be used as the water flow driving component in both normal water production mode and pre-filter cartridge regeneration mode, saving costs.

[0040] In one alternative implementation, the drain end of the backflushing line merges with the flushing water discharge line.

[0041] Beneficial effects: This design simplifies the piping, allowing the backwash water and flush water to merge and be discharged into the external drainage system.

[0042] Secondly, the present invention also provides a water production control method for a water purification system, applicable to the water purification system of any of the above embodiments, wherein the water purification system has a regeneration mode, and the following steps are executed after the water purification system receives a command to start the regeneration mode.

[0043] The control valve group opens the forward flushing pipeline, allowing tap water entering from the tap water inlet to directly or after heating to flush the pre-filter element and then be discharged from the flushing water discharge pipeline.

[0044] And / or, the control valve group opens the reverse flushing pipeline to reverse the flow of hot water from the heating device into the post-filter cartridge for hot water flushing.

[0045] In one alternative implementation, after the water purification system receives the command to start the regeneration mode, the following steps are also performed;

[0046] The heating unit is activated to heat the flushing water, which is then used to flush the pre-filter cartridge in the forward direction.

[0047] In one optional implementation, after the thermal regeneration mode of the pre-filter and / or post-filter ends, a cooling mode is entered, specifically including the following steps:

[0048] The heating unit is turned off, and the ambient temperature cooling water entering from the tap water inlet is passed into the pre-filter element in the forward direction and discharged from the flushing water discharge pipe.

[0049] And / or, the control valve group opens the outlet of the pure water storage device and the post-filter cartridge, and reverses the flow of room temperature water from the pure water storage device into the post-filter cartridge for cooling, and discharges it from the drain section of the reverse flushing pipeline.

[0050] In one alternative implementation, the thermal regeneration mode and the cooling mode are controlled to alternate.

[0051] In an optional implementation, the regeneration mode further includes a soaking step, specifically comprising the following steps:

[0052] The water flow drive and the second switch valve are closed to soak the pre-filter cartridge in hot water heated by the heating unit; and / or, the third switch valve is closed to soak the post-filter cartridge in hot water from the heating device.

[0053] In one alternative implementation, during the hot regeneration mode, the temperature of the flushing water for the pre-filter and post-filter is greater than the ambient temperature but less than the boiling point of water. Attached Figure Description

[0054] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0055] Figure 1 This is a schematic diagram illustrating the principle of the purification system heating unit being externally placed in the pre-filter element in an embodiment of the present invention.

[0056] Figure 2 This is a schematic diagram illustrating the principle of the purification system heating unit being built into the pre-filter in an embodiment of the present invention.

[0057] Figure 3 for Figure 1 A schematic diagram of the water flow direction when the purification system is in water production mode;

[0058] Figure 4 for Figure 1 A schematic diagram of the water flow direction when the purification system is in regeneration mode;

[0059] Figure 5 for Figure 1 A schematic diagram of the water flow direction when the purification system is in cooling mode.

[0060] Explanation of reference numerals in the attached figures:

[0061] 100. Water inlet; 200. Water intake;

[0062] 10. Pre-filter; 10a. Pre-filter inlet; 10b. Pre-filter outlet;

[0063] 101. First pipeline; 1011. First switching valve; 1012. Heating unit;

[0064] 11. Forward flushing pipeline; 111. Flushing water discharge pipeline; 1111. Second switch valve; 1110. First water inlet;

[0065] 12. Backflush pipeline; 120. Switching valve; 121. Inlet pipe section; 122. Drain pipe section; 1221. Third switch valve;

[0066] 20. Precision filter element; 201. Concentrate pipeline; 2010. Second inlet; 2011. Wastewater switch valve;

[0067] 30. Post-filter; 30a. Post-inlet; 30b. Post-outlet; 301. Second pipeline; 3011. Fourth switch valve;

[0068] 40. Pure water storage device; 401. Third pipeline

[0069] 50. Heating device; 501. Fourth pipeline;

[0070] 60. Coarse filter element; 601. Booster pump. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0072] To achieve the goal of long lifespan and fewer filter replacements in water purifiers, the industry mainly extends the lifespan of carbon filter cartridges by improving carbon materials, manufacturing processes, and increasing the amount of carbon used. All of these can improve water purification performance and lifespan to some extent, but there are always points of failure. It is necessary to find a breakthrough to improve the lifespan of filter cartridges.

[0073] Research indicates that the adsorption of pollutants by activated carbon mainly involves physical adsorption and chemical adsorption. Physical adsorption is the primary adsorption process in activated carbon; changing conditions can disrupt the adsorption equilibrium, causing the adsorbate to desorb. Chemical adsorption is irreversible, essentially involving the formation of stable complexes between the functional groups on the activated carbon surface and pollutant molecules. In practice, activated carbon initially relies primarily on physical adsorption. Once physical adsorption approaches saturation, chemical adsorption intervenes, leading to complete ineffectiveness. Addressing these characteristics, finding ways to disrupt the equilibrium between activated carbon and the adsorbate, reversing physical adsorption while simultaneously slowing down the chemical adsorption process, can regenerate the activated carbon, restore its adsorption capacity, and extend its service life.

[0074] Therefore, it is necessary to find a more effective universal technology to extend the lifespan of activated carbon filters, in order to solve the problems of short filter lifespan and frequent replacement, improve filter lifespan, meet energy conservation and environmental protection requirements, and enhance product competitiveness.

[0075] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0076] According to an embodiment of the present invention, in one aspect, the present invention provides a water purification system, which includes a water production pipeline, a forward flushing pipeline 11, and a reverse flushing pipeline 12.

[0077] Specifically, a pre-filter 10, a post-filter 30, a pure water storage device 40, and a heating device 50 are connected in series on the water purification pipeline. Along the water flow direction in the water purification pipeline, the pre-filter 10 is provided with a pre-inlet 10a and a pre-outlet 10b, and the post-filter 30 is provided with a post-inlet 30a and a post-outlet 30b. The heating device 50 is connected to the pure water storage device 40 and is suitable for selectively heating the pure water from the pure water storage device 40. Both the pre-filter 10 and the post-filter 30 include a carbon water purification unit.

[0078] Furthermore, the forward flushing pipeline 11 includes a water supply pipeline located upstream of the pre-filter 10 and a flushing water discharge pipeline 111 connected to the pre-outlet 10b of the pre-filter 10. A heating unit 1012 is provided on the water supply pipeline upstream of the pre-filter 10 and / or inside the pre-filter 10. The heating unit 1012 is adapted to selectively heat the water used to flush the pre-filter 10. The tap water entering from the water supply pipeline upstream of the pre-filter 10 is heated and discharged through the flushing water discharge pipeline 111 after forward flushing the pre-filter 10.

[0079] Furthermore, along the water flow direction in the backwash pipe 12, the backwash pipe 12 is connected in series with the heating device 50, the post-outlet 30b, the post-filter 30, and the post-inlet 30a. The backwash pipe 12 is adapted to reverse the flow of hot water from the heating device 50 into the post-filter 30 to flush the post-filter 30 before discharging it from the post-inlet 30a. A control valve assembly is installed on the water production pipe, the flushing water discharge pipe 111, and the backwash pipe 12, and is adapted to switch the flow of the water production pipe or control the flow of the forward flushing pipe 11 and / or the backwash pipe 12.

[0080] In the above embodiment, the water flow direction is forward during the water production process. When the forward flushing pipe 11 is in operation, the tap water entering from the tap water inlet 100 flows sequentially through the water production pipe upstream of the pre-filter 10, the pre-filter 10, and the flushing water discharge pipe 111. When the reverse flushing pipe 12 is in operation, the hot water in the heating device 50 reverses along the reverse flushing pipe 12 to flush the post-filter 30 and then is discharged from the inlet (i.e., the post-inlet 30a) of the post-filter 30.

[0081] When the water purification system starts regeneration mode, such as Figure 1 and Figure 4 As shown, the control valve assembly can open the water supply line located upstream of the pre-filter 10 to supply a set amount of flushing water to the pre-filter 10. Then, the control valve assembly closes the water supply line, opens the forward flushing line 11, and drives the flushing water in the forward flushing line 11 to flow, thereby realizing forward flushing of the pre-filter 10, thus achieving effective regeneration of activated carbon, improving the service life of the pre-filter 10, and avoiding the trouble and increased operating costs caused by frequent replacement of the filter element.

[0082] In addition, when the water purification system starts the regeneration mode, the control valve group can also open the back flushing pipeline 12, so that the hot water in the heating device 50 enters the post-filter 30, thereby back flushing the post-filter 30. The deposits on the post-filter 30 can be effectively peeled off and removed in the reverse hot water flow, realizing the effective regeneration of the post-filter 30, improving the service life of the filter element, and avoiding frequent filter replacement.

[0083] The water purification system provided in this embodiment can flush the pre-filter 10 in the forward direction and the post-filter 30 in the reverse direction, extending the service life of the pre-filter 10 and the post-filter 30. It does not require frequent replacement and is less expensive than related technologies. It can also effectively avoid the water safety hazards caused by chemical regeneration methods and ensure water safety.

[0084] It should be noted that in this embodiment, the forward flushing pipeline 11 consists of a water supply pipeline and a flushing water discharge pipeline 111 located upstream of the pre-filter cartridge 10. More precisely, only one flushing water discharge pipeline 111 needs to be connected to the outlet of the pre-filter cartridge 10 (i.e., the pre-filter outlet 10b). Through the cooperation of the control valve assembly and other electrical components, the flushing and regeneration of the pre-filter cartridge 10 can be achieved. The structure is simple, the cost is low, and it is easy to implement. The hot water used for flushing and regenerating the pre-filter cartridge 10 and the post-filter cartridge 30 is warm water with a temperature between ambient temperature and the boiling point of water.

[0085] In this embodiment, the heating unit 1012 heats the rinsing water used to rinse the pre-filter 10, making the rinsing water hot. Rinsing or soaking the pre-filter 10 with hot water makes it easier to peel off and remove impurities and dirt adhering to it, thus achieving effective regeneration of the activated carbon in the pre-filter 10 and further improving the removal effect on impurities. Furthermore, the pre-filter 10 uses an independent heating unit 1012 for thermal regeneration, which can be activated only during the pre-filter 10 regeneration mode. This allows for separate and independent operation of the thermal regeneration of the pre-filter 10 and the post-filter 30, providing greater flexibility.

[0086] The core of the water purification system provided in this embodiment lies in the application of thermal regeneration technology to the filter element of the water purifier, which extends the life of the carbon filter element and the replacement cycle. The filter element used for thermal regeneration is a carbon filter element, which is not limited to various forms. The carbon-containing water purification filter element unit is the target of thermal regeneration technology. Optionally, both the pre-filter element 10 and the post-filter element 30 are activated carbon filter elements.

[0087] The medium used in the thermal regeneration mode is hot water, with a temperature between ambient temperature and the boiling point of water. By rinsing the pre-filter 10 and post-filter 30 with hot water, not only is there a rinsing effect, but the hot water can also disrupt the balance between the carbon and the adsorbed pollutants, causing the pollutants to desorb and thus restore some of the adsorption capacity of the carbon filter element, achieving regeneration. This process is also relatively safe and convenient.

[0088] The specific structure, arrangement, and working principle of the heating unit 1012 in the above two embodiments will be described in detail below with reference to the accompanying drawings.

[0089] In this embodiment, as Figure 1 , Figure 2 As shown, the heating unit 1012 has two implementation methods: built-in and external.

[0090] Specifically, in one implementation, such as Figure 2 As shown, the heating unit 1012 includes a heating component disposed within the membrane housing of the pre-filter 10. The built-in heating component is integrally disposed with the membrane housing of the pre-filter 10. When the membrane housing is separated from the inner core, only the inner core needs to be replaced when replacing the filter element. When the membrane housing and the inner core are integral, the entire filter element needs to be replaced when replacing it.

[0091] In another implementation, such as Figure 1 As shown, the heating unit 1012 includes a heating component disposed on a water supply pipe located upstream of the pre-filter cartridge 10. When rinsing the pre-filter cartridge 10, the rinsing water flows through the heating component and then enters the pre-filter cartridge 10. The external heating component is independent of the pre-filter cartridge 10 and does not affect the replacement of the pre-filter cartridge 10.

[0092] It should be noted that the heating element can be a stainless steel heating tube, an electric heating wire, etc., which can rapidly heat up to the set temperature. The heating element can be installed inside the pre-filter 10 to heat the rinsing water, or it can be installed on the water supply line to heat the rinsing water of the pre-filter 10. This embodiment does not limit this.

[0093] In this embodiment, the regeneration of the pre-filter 10 uses tap water as the flushing water source. The water flow direction of the forward flushing pipeline 11 is the same as that of the water flow direction of the water production pipeline during normal water production. During the flushing process, the heating unit 1012 can effectively maintain the hot water temperature when it is running at low power, so that the pollutants on the activated carbon can be effectively stripped and removed in the running water, and the cost is low.

[0094] In some embodiments, the heating unit 1012 further includes a water temperature detection element for detecting the temperature information of the rinsing water; the water temperature detection element and the heating component are respectively connected to the control unit of the water purification system, and the control unit is adapted to control the operation of the heating component according to the temperature information of the rinsing water detected by the water temperature detection element.

[0095] Optionally, the water temperature detection element is a temperature sensor. Optionally, the water temperature detection element is installed inside the pre-filter 10, or the water temperature detection element is installed on the water production pipeline located downstream of the heating element and upstream of the water inlet of the pre-filter 10.

[0096] In some embodiments, the control valve assembly includes a first switching valve 1011 and a second switching valve 1111, wherein the first switching valve 1011 is disposed on a water supply pipeline located upstream of the pre-filter 10 and is adapted to control whether water is supplied to the pre-filter 10; the second switching valve 1111 is disposed on a flushing water discharge pipeline 111 and is adapted to control whether flushing water in the pre-filter 10 is discharged.

[0097] In the above embodiment, the first switch valve 1011 controls whether tap water is supplied to the pre-filter cartridge 10, and the second switch valve 1111 controls the opening and closing of the flushing water discharge pipe 111, enabling the selection and switching between the water production mode and the regeneration mode of the pre-filter cartridge 10. When the regeneration mode of the pre-filter cartridge 10 is activated, both the first switch valve 1011 and the second switch valve 1111 are opened, and the heating unit 1012 is activated simultaneously to flush the pre-filter cartridge 10 with hot water. Alternatively, after supplying a set amount of hot water to the pre-filter cartridge 10, the first switch valve 1011 and the second switch valve 1111 are closed, allowing the pre-filter cartridge 10 to be soaked in hot water, making it easier for dirt and impurities attached to the pre-filter cartridge 10 to fall off.

[0098] In some embodiments, the backwash pipeline 12 includes a drain pipe section 122 connected to the post-inlet 30a, and the control valve assembly includes a switching valve 120 and a third switching valve 1221. Specifically, the switching valve 120 is adapted to switch the connection between the pure water storage device 40 or the heating device 50 and the post-outlet 30b; the third switching valve 1221 is disposed on the drain pipe section 122 of the backwash pipeline 12 and is adapted to control the water flow of the drain pipe section 122.

[0099] In the above embodiment, during normal water production mode, the switching valve 120 switches to the first state where the post-outlet 30b is connected to the pure water storage device 40, allowing the purified water from the post-filter 30 to enter the pure water storage device 40 for storage. When the post-filter 30 regeneration mode is activated, the switching valve 120 switches to the second state where the heating device 50 is connected to the post-outlet 30b. The third switching valve 1221 can be selectively opened or closed, allowing hot water from the heating device 50 to flow back into the post-filter 30 for rinsing or soaking. The post-filter 30 regeneration system shares a heat source (i.e., the heating device 50) with the drinking water purification system. The regeneration water source is pure water, and the regeneration pipeline flows in the opposite direction to the normal water production pipeline, enabling reverse flushing and regeneration of the filter element. While the backflushing pipeline achieves effective regeneration, the backflushing force also regenerates the post-filter 30 and removes some impurities. Pollutants can be effectively removed through soaking and rinsing.

[0100] In this embodiment, the water source for the regeneration and cooling of the post-filter 30 is filtered pure water. Since most of the impurities and dirt in the water have been filtered out by the various filter elements upstream of the post-filter 30 during water production, the impurities in the water when it reaches the post-filter 30 are negligible. Therefore, the impurities in the post-filter 30 are much less than those in the pre-activated carbon filter. In view of this, this embodiment uses pure water with a higher degree of cleanliness and almost no impurities to rinse the post-filter 30, avoiding the use of tap water as the rinsing water source. The impurities in tap water can cause a backlash against the post-filter 30, resulting in the problem of the post-filter 30 not being cleaned properly.

[0101] In this embodiment, the hot water used for the regeneration of the post-filter 30 shares a heating device 50 with the water inlet 200 of the water purification system, saving costs and simplifying the structure. In regeneration mode, the hot water backwash pipe 12 in the heating device 50 flows in the opposite direction to the normal water purification pipe, enabling backwashing regeneration of the post-filter 30. While effectively regenerating, the backwash pipe 12 also clears the post-filter 30 and removes impurities through backwashing force. In cooling mode, room-temperature pure water from the pure water storage device 40 is introduced into the post-filter 30 to lower the carbon filter temperature, preventing damage to electrical components or disruption to normal drinking water supply when switching to normal water purification mode.

[0102] In some embodiments, the switching valve 120 is a two-way valve with three valve ports. Two valve ports of the two-way valve are connected to the water supply pipeline, and the other valve port of the two-way valve is connected to the backwash pipeline 12.

[0103] In the above embodiments, the switching between the water production pipeline and the backwash pipeline 12 is completed by opening or closing the two-way valve, or the switching between hot water flushing and normal temperature flushing. This makes it easier to switch between normal water production mode and backwash mode, and the structure is simpler, more reliable, and the pipeline is more simplified.

[0104] In some embodiments, the switching valve 120 is a two-way valve with three valve ports. Two valve ports of the two-way valve are connected to the water supply pipeline, and the other valve port of the two-way valve is connected to the backwash pipeline 12.

[0105] In the above embodiment, the switching valve 120 is a two-way valve with one inlet and two outlets, or it can also be called a three-way valve. When open, the backwash pipeline 12 is connected to the post-filter 30; when closed, the water production pipeline is connected to the post-filter 30. The two-way valve is used to switch the pipeline connection status. The two-way valve has three valve ports. When the two-way valve is closed, the water production pipeline is connected, and normal water production can be achieved. When the two-way valve is open, the backwash pipeline 12 is connected, which can achieve backwashing of the post-filter 30.

[0106] Specifically, the three valve ports of the two-way valve are the first valve port, the second valve port, and the third valve port. The first valve port and the third valve port are connected to the water production pipeline, and the third valve port is connected to the backwash pipeline 12. When the two-way valve is closed, the first valve port and the third valve port are opened, so that the water production pipeline can be connected; and when the two-way valve is opened, the first valve port and the second valve port are opened, so that the backwash pipeline 12 can be connected.

[0107] In some embodiments, such as Figure 1 and Figure 2 As shown, the water production pipeline includes a first pipeline 101, a second pipeline 301, and a third pipeline 401. One end of the first pipeline 101 is connected to a tap water inlet, and the other end is connected to a pre-inlet 10a. One end of the second pipeline 301 is connected to a pre-outlet 10b, and the other end is connected to a post-inlet 30a. One end of the third pipeline 401 is connected to a post-outlet 30b, and the other end is connected to the inlet of the pure water storage device 40. The backwash pipeline 12 includes an inlet pipe section 121, one end of which is connected to the hot water outlet of the heating device 50, and the other end is connected to the third pipeline 401 through a switching valve 120.

[0108] In the above embodiment, the connection between the post-outlet 30b and the pure water storage device 40, or between the post-outlet 30b and the inlet section 121 of the backwashing pipeline 12, is switched by the switching valve 120 to complete the backwashing of the post-filter cartridge 30. By using the opposite direction of the water flow during normal water production to wash the impurities and dirt attached to the post-filter cartridge 30, these impurities and dirt can be more easily removed, the impurity removal effect is better, and the activated carbon can be regenerated. The switching valve 120 can switch the direction of water flow, realizing bidirectional flow of water in the post-filter cartridge 30, so that the water production mode and the backwashing mode of the post-filter cartridge 30 do not affect each other. The structure is simple, reliable, and easy to implement.

[0109] In some embodiments, the control valve assembly further includes a fourth switching valve 3011, which is disposed on the second pipeline 301 and is adapted to control the flow of water between the pre-filter 10 and the post-filter 30.

[0110] In the above embodiment, the fourth switch valve 3011 can control the water flow between the pre-filter 10 and the post-filter 30. In normal water production mode, the second pipeline 301 is opened. When the regeneration mode of the pre-filter 10 is started, the fourth switch valve 3011 can close the second pipeline 301 to prevent the hot water used to flush the pre-filter 10 from flowing into the next stage filter, affecting the normal operation of the regeneration mode of the pre-filter 10, or causing performance damage to the next stage filter.

[0111] In some embodiments, the water purification system further includes a precision filter element 20 connected in series on the second pipeline 301; there are two fourth switching valves 3011, one of which is disposed on the second pipeline 301 between the pre-filter element 10 and the precision filter element 20, and the other of which is disposed on the second pipeline 301 between the precision filter element 20 and the pre-filter element 10.

[0112] In the above embodiment, the precision filter element 20 can filter out all impurity molecules except water molecules. However, the precision filter element 20 is not resistant to high temperatures, and the hot water used for filter element regeneration must bypass this stage of the filter element. Therefore, a fourth switching valve 3011 is set between the pre-filter element 10 and the precision filter element 20. During normal water production, two fourth switching valves 3011 can be opened, allowing the water filtered by the pre-filter element 10 to sequentially enter the precision filter element 20 and the post-filter element 30 for further purification. When regenerating the pre-filter element 10, the fourth switching valve 3011 located between the filter element and the precision filter element 20 is closed to prevent hot water flowing from the outlet of the pre-filter element 10 from entering the precision filter element 20 and causing damage to it. In the regeneration mode of the post-filter element 30, the fourth switching valve 3011 located between the precision filter element 20 and the post-filter element 30 is closed to prevent backwash water from flowing back into the precision filter element 20 and damaging its performance.

[0113] It should be noted that in this embodiment, the first switching valve 1011, the second switching valve 1111, the third switching valve 1221, and the fourth switching valve 3011 are all solenoid valves.

[0114] Furthermore, the reverse osmosis membrane filter has an inlet, an outlet, and a wastewater outlet. The inlet of the precision filter element 20 is connected to the outlet of the pre-filter element 10 (i.e., pre-outlet 10b) via a first section of the second pipeline 301. The wastewater outlet is connected to a concentrate pipeline 201, which is equipped with a wastewater switch valve 2011. The outlet of the precision filter element 20 is connected to the inlet of the post-filter element 30 (i.e., post-inlet 30a) via a second section of the second pipeline 301. Two fourth switch valves 3011 are respectively installed on the first and second sections of the second pipeline 301, and a switching valve 120 is installed on the second section of the second pipeline 301. The outlet of the post-filter 30 (i.e., the post-outlet 30b) is connected to the inlet of the pure water storage device 40 through a third pipe 401, and the outlet of the pure water storage device 40 is connected to the inlet of the heating device 50 through a fourth pipe 501.

[0115] Furthermore, the water purification system also includes a coarse filter element 60, which has an inlet and an outlet. The inlet of the coarse filter element 60 is connected to the tap water inlet 100, and the outlet of the coarse filter element 60 is connected to the inlet of the pre-filter element 10 (i.e., the pre-filter inlet 10a) through the first pipe 101. The coarse filter element 60 can remove organic matter, residual chlorine, colloids, heavy metals, and sediment particles, thereby reducing the impurities entering the pre-filter element 10 and the post-filter element 30, which is beneficial for the regeneration of the pre-filter element 10 and the post-filter element 30.

[0116] In this embodiment, the water purification system, through the aforementioned filter cartridges, can purify the raw water to meet drinking water standards, and the purified water enters the pure water storage device 40. The coarse filter cartridge 60 and the pre-filter cartridge 10 serve as pre-treatment filter cartridges to remove organic matter, colloids, heavy metals, and sediment particles, etc., and can take various forms. For example, the pre-treatment filter cartridge can be composed of two filter cartridges connected in series: a primary PP cotton or ultrafiltration cartridge and a primary pre-activated carbon cartridge, or it can be a composite filter cartridge in the form of a primary PCB cartridge, etc. The attached drawings of this embodiment show a two-stage series configuration.

[0117] Furthermore, the precision filter element 20 is mainly composed of an RO membrane and is the core component of the water purification system. It boasts extremely high purification precision, capable of filtering out all impurities except for water molecules. It should be noted that because the precision filter element 20 is generally not heat-resistant, in this embodiment, both forward rinsing of the pre-filter element 10 and reverse rinsing of the post-filter element 30 must avoid the precision filter element 20 to prevent damage. The post-filter element 30 can be located before or after the pure water outlet section and is the final purification stage in the water purification system, used to remove trace elements, adjust pH, and improve drinking taste.

[0118] In some embodiments, a booster pump 601 is provided on the water production pipeline located upstream of the pre-filter 10.

[0119] In the above embodiment, the booster pump 601 is installed on the water production pipeline to boost pressure, control the on / off state of the entire water purification system, and serve as the driving force for the circulation of the pre-filter cartridge 10 during disinfection and regeneration. By driving the flushing water in the forward flushing pipeline 11 through the booster pump 601, the pre-filter cartridge 10 is flushed in a forward direction, thereby achieving effective regeneration of the pre-filter cartridge 10, improving its service life, and avoiding the inconvenience and increased operating costs associated with frequent cartridge replacement. In this embodiment, the same booster pump 601 can be used as the water flow driving component in both the normal water production mode and the pre-filter cartridge 10 regeneration mode, saving costs.

[0120] Optionally, a booster pump 601 is installed on the water production pipeline located between the coarse filter element 60 and the tap water inlet 100.

[0121] In some embodiments, the drain end of the backflushing line 12 merges with the flushing water discharge line 111. This design simplifies the piping, allowing the discharge water from the backflushing line 12 and the flushing water discharge line 111 to merge and be discharged into the external drainage system.

[0122] Specifically, the outlet end of the drain pipe section 122 is connected to the flushing water discharge pipe 111 through the first water inlet 1110, and the first water inlet 1110 is located downstream of the second switch valve 1111. The third switch valve 1221 and the second switch valve 1111 are both located upstream of the first water inlet 1110. This not only realizes that the pre-filter 10 and the post-filter 30 share the same drain pipe, simplifying the pipeline, but also allows the flushing of the pre-filter 10 and the post-filter 30 to be carried out independently without affecting each other.

[0123] Optionally, the end of the flushing water discharge pipe 111 is connected to the outlet end of the concentrate pipe 201 through the second water inlet 2010. The third switch valve 1221 and the second switch valve 1111 are both located upstream of the second water inlet 2010. This allows the pre-filter 10, the precision filter 20, and the post-filter 30 to share the same drainage pipe, simplifying the pipeline. It also allows the flushing of the pre-filter 10 and the post-filter 30, as well as the discharge of wastewater from the precision filter 20, to be carried out independently without affecting each other.

[0124] The water purification system provided in this embodiment realizes the use of hot water to regenerate the filter cartridge in situ. Specifically, it includes a water production mode, a hot regeneration mode, and a cooling mode. Hot water is used as the disinfection and regeneration medium to avoid the use of high-temperature-sensitive precision filter cartridge 20. Different modes are switched through logic control of pipelines and components to realize functions such as normal drinking water for users, short-term flushing disinfection of activated carbon, and long-term regeneration.

[0125] It should be noted that in this embodiment, the pure water storage device 40 can take many forms. For example, in the pure water tank mode of a countertop water purifier, an external drive pump is required for water extraction or regeneration; in the pressure tank mode of a commercial water purifier, no external drive pump is required. It can store a certain volume of purified water and use pressure to extract water or regenerate it. In this embodiment, the pure water storage device 40 is embodied in the form of a pressure tank.

[0126] Furthermore, the heating device 50 includes a heating tank, a heating structure, and a temperature control device. The heating structure includes a heating element and a rare-earth thick film, which rapidly raises the temperature of the purified water to a specified temperature. The temperature control device connects the pure water storage device 40 and the heating structure, and can control the water intake temperature through heat exchange or water mixing. The power of the heating device 50 is controlled by the water purification system control unit based on relevant sensor parameters. In this embodiment, the heating device 50 is embodied in the form of a heating tank and a heating element.

[0127] Furthermore, the water purification system also includes a water pump, which is used to enable users to obtain water. The control of the operation of each component and the overall system is mainly based on relevant detection parameters (such as purified water volume, time, water temperature, and liquid level) to control the start and stop of the booster pump 601, the power of the heating unit 1012, the power of the heating device 50, the temperature control device, and the opening and closing of the control valve group, thereby switching between various operating modes. Since the focus of this embodiment is on rinsing the pre-filter 10 and post-filter 30 with hot water, the specific program control is not the focus of this embodiment and will not be described in detail.

[0128] This embodiment provides a separate regeneration system for the pre-filter 10 and post-filter 30 using hot water in-situ regeneration. The pre-filter 10 is regenerated by forward flushing with hot water, and it uses a separate heat source with two different positions for the heating element. The post-filter 30 is regenerated by reverse flushing pipe 12, which uses the same heat source for both water purification and regeneration. The system can be regenerated individually or simultaneously depending on the degree of contamination of the pre-filter 10 and post-filter 30.

[0129] The water purification system with a heat regeneration pipeline provided in this embodiment, combined with the opening and closing of different components and valve groups in the logic control system, uses hot water to disinfect and regenerate the filter element, which can effectively extend the service life of the filter element.

[0130] The following is in conjunction with the appendix Figure 1 To be continued Figure 5 The water purification system in this embodiment is described in terms of its water production mode, thermal regeneration mode, and cooling mode.

[0131] 1. Water production mode (see Figure 1 , Figure 2 and Figure 3 As shown):

[0132] The first switching valve 1011 and the two fourth switching valves 3011 are open, the second switching valve 1111 and the third switching valve 1221 are closed, and the switching valve 120 is switched to the state where the post-outlet is connected to the inlet of the pure water storage device 40 (i.e., the closed state / first state). Tap water flows sequentially through the coarse filter element 60, the first pipeline 101, the first switching valve 1011, the booster pump 601, and the heating unit 1012 (not in operation) before entering the pre-filter element 10 or directly into the pre-filter element 10 (with the built-in heating unit 1012 and the heating unit 1012 is not in operation). (12 not running), then enters the precision filter element 20 through the first section of the second pipeline 301 and its fourth switch valve 3011. The precision filter element 20 has a concentrate outlet and a water outlet, wherein the concentrate outlet is connected to the wastewater switch valve 2011, and the pure water enters the post-filter element 30 from the water outlet through another fourth switch valve 3011 for treatment, and then enters the pure water storage device 40, i.e., the pure water tank, through the switching valve 120 (closed to the first state). The water tank outlet is connected to the heating device 50, which can heat the incoming water to provide hot water to the user. Optionally, the pure water storage device 40 is connected to the water outlet 200 through a normal temperature water pipe to provide normal temperature water to the user.

[0133] 2. Thermal regeneration mode (see...) Figure 1 , Figure 2 and Figure 4 As shown):

[0134] In the hot regeneration mode of the pre-filter 10, the first and second switching valves 1011 and 1111 are opened, the third and fourth switching valves 1221 and 3011 are closed, and the booster pump 601 and heating unit 1012 are operated. Tap water, after being pressurized by the first switching valve 1011 and the booster pump 601, is heated by the heating unit 1012 and then enters the pre-filter 10, or directly enters the pre-filter 10 which has the heating unit 1012 built-in. After rinsing the pre-filter 10, the water is discharged from the flushing water discharge pipe 111, thus achieving forward flushing of the pre-filter 10 using hot water circulation. The pre-filter 10 is regenerated by soaking or running water rinsing through program control of the opening and closing of the inlet valves 1011 and 1111.

[0135] The hot regeneration mode of the pre-filter 10: The fourth switching valve 3011, located between the precision filter 20 and the post-filter 30, is controlled to open and close. The third switching valve 1221 is open, and the switching valve 120 is opened (switched to state two), connecting the inlet pipe section 121 and the outlet (post-filter outlet) of the post-filter 30. Hot water from the heating device 50 enters the post-filter 30 in reverse through the switching valve 120, and hot regeneration wastewater is discharged through the third switching valve 1221, thus achieving backwashing of the post-filter 30 with hot water. The post-filter 30 is regenerated by soaking or running water rinsing through the opening and closing of the third switching valve 1221 controlled by a program. Optionally, a water pump is installed on the inlet pipe section 121 to draw hot water from the heating device 50 into the post-filter 30 for backwashing when the backwashing pipe 12 is open.

[0136] 3. Cooling Mode (see...) Figure 1 , Figure 2 and Figure 5 As shown):

[0137] In the cooling mode of the pre-filter 10, the first switch valve 1011 and the second switch valve 1111 are opened, the fourth switch valve 3011 located between the pre-filter 10 and the precision filter 20 is closed, the third switch valve 1221 is closed, the booster pump 601 is turned on, and the heating unit 1012 is not running. Tap water enters the pre-filter 10 after being pressurized by the first switch valve 1011 and the booster pump 601, and the ambient temperature cooling wastewater is discharged through the second switch valve 1111, which is the cooling water flow path of the pre-filter 10.

[0138] In the cooling mode of the post-filter 30, the control switching valve 120 is closed (switched to the second state), which connects the outlet of the pure water storage device 40 and the post-filter 30. The fourth switching valve 3011, located between the precision filter 20 and the post-filter 30, is closed, and the third switching valve 1221 is opened. The ambient temperature pure water in the pure water storage device 40 enters the post-filter 30 through the switching valve 120, and the ambient temperature cooling wastewater is discharged through the opened switching valve 120 (switched to the second state) and the third switching valve 1221. This is the cooling water flow path of the post-filter 30.

[0139] It should be noted that in this embodiment, the pure water storage device 40 uses a pressure tank, or a combination of a pure water tank and a pump, to reverse pressurize the pure water in the pure water storage device 40 and introduce it into the post-filter element 30.

[0140] According to an embodiment of the present invention, in another aspect, a water production control method for a water purification system is provided, applicable to the water purification system of any of the above embodiments. The water purification system has a regeneration mode, and after receiving a command to start the regeneration mode, the water purification system performs the following steps: the control valve group opens the forward flushing pipeline 11, so that the tap water entering from the tap water inlet 100 directly or after heating flushes the pre-filter 10 and is then discharged from the flushing water discharge pipeline 111; and / or, the control valve group opens the reverse flushing pipeline 12, so that the hot water in the heating device 50 is reversed and fed into the post-filter 30 for hot water flushing.

[0141] In this embodiment, the pre-filter 10 and post-filter 30 can be regenerated separately or simultaneously, depending on the degree of contamination of each. The pre-filter 10 uses tap water for regeneration and cooling, and its regeneration uses an independent heat source. The heating unit 1012 is only activated during disinfection regeneration. Its regeneration pipeline flows in the same direction as the normal water supply pipeline, enabling the pre-filter 10 to undergo flow rinsing regeneration. Contaminants on the activated carbon are effectively removed in the flowing water. The post-filter 30 uses pure water from the pure water storage device 40 for cooling. Its regeneration hot water shares a heating device 50 with the water inlet 200 of the drinking water purification system. Its regeneration pipeline flows in the opposite direction to the normal water supply pipeline, enabling the post-filter 30 to undergo reverse rinsing regeneration. While effectively regenerating, the reverse rinsing pipeline 12 also clears the post-filter 30 and removes impurities through backwashing force.

[0142] In some embodiments, after the water purification system receives the command to start the regeneration mode, the following steps are also performed: control the heating unit 1012 to start, heat the flushing water, and use hot water to flush the pre-filter 10 in the forward direction.

[0143] It should be noted that in this embodiment, the water temperature used for thermal regeneration is higher than the ambient temperature but lower than the boiling point of water. The power of the heating unit 1012 is controlled by the system, or the temperature adjustment device of the heating device 50 is used to adjust the temperature to achieve different regeneration modes.

[0144] In some embodiments, after the thermal regeneration mode of the pre-filter 10 and / or post-filter 30 ends, a cooling mode is entered, specifically including the following steps: controlling the heating unit 1012 to turn off, allowing ambient temperature cooling water entering from the tap water inlet 100 to be passed into the pre-filter 10 in the forward direction, and discharged from the flushing water discharge pipe 111; and / or, controlling the valve group to open the outlet of the pure water storage device 40 and the post-filter 30, and allowing ambient temperature water in the pure water storage device 40 to be passed into the post-filter 30 in the reverse direction for cooling, and discharged from the drain pipe section 122 of the reverse flushing pipe 12.

[0145] In some embodiments, the hot regeneration mode and the cooling mode are operated alternately. Optimal regeneration results can be achieved by alternating between the hot regeneration mode and the cooling mode. The control valve assembly is opened or closed alternately, in conjunction with the ambient temperature cooling mode, to achieve the best regeneration effect.

[0146] In some embodiments, the regeneration mode further includes a soaking step, specifically including the following steps: controlling the water flow drive and the second switch valve 1111 to close, and using hot water heated by the heating unit 1012 to soak the pre-filter 10; and / or controlling the third switch valve 1221 to close, and using hot water in the heating device 50 to soak the post-filter 30.

[0147] The program is set to start the regeneration mode. The heated tap water enters the pre-filter 10 or the heating device 50 through the forward flushing pipe 11. The heated pure water enters the post-filter 30 through the reverse flushing pipe 12. The control valve group controls the hot water in the pre-filter 10 and post-filter 30 to be in a flowing flushing or static soaking state according to the set logic. After the hot regeneration mode is completed, the cooling mode is started. After the entire regeneration mode is completed, the normal water production mode is entered.

[0148] Specifically, the thermal regeneration mode includes a set time for hot water flow rinsing and / or a set time for static soaking. Furthermore, the thermal regeneration methods include various forms such as running water rinsing, soaking and short-time rinsing disinfection, long-time soaking or flow regeneration, and alternating hot and cold water rinsing regeneration, combined with a room temperature cooling mode for alternating regeneration and cooling to achieve the best regeneration effect. While the user is drinking normal water, the filter cartridge achieves fully automatic in-situ disinfection and regeneration, including short-time disinfection and long-time regeneration, effectively ensuring water purification performance and drinking water safety, and reducing the frequency of filter cartridge replacement.

[0149] This embodiment uses a water purification system with a heat regeneration pipeline and a logic control method to control the opening and closing of different components of the system. Hot water is used to disinfect and regenerate the filter element, which can effectively improve the service life of the filter element, extend the replacement cycle, increase the rated water purification capacity of the whole machine, enhance product competitiveness, and respond to the requirements of energy conservation and environmental protection.

[0150] Although embodiments of the 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 invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A water purification system, characterized in that, include: A water production pipeline, wherein a pre-filter (10), a post-filter (30), a pure water storage device (40) and a heating device (50) are connected in series in the water production pipeline. Along the water flow direction in the water production pipeline, the pre-filter (10) is provided with a pre-inlet (10a) and a pre-outlet (10b) in sequence, and the post-filter (30) is provided with a post-inlet (30a) and a post-outlet (30b) in sequence. The heating device (50) is connected to the pure water storage device (40) and is adapted to selectively heat the pure water from the pure water storage device (40). Both the pre-filter (10) and the post-filter (30) include a carbon water purification unit. The forward flushing pipeline (11) includes a water supply pipeline located upstream of the pre-filter (10) and a flushing water discharge pipeline (111) connected to the pre-outlet (10b) of the pre-filter (10). A heating unit (1012) is provided on the water supply pipeline located upstream of the pre-filter (10) and / or inside the pre-filter (10). The heating unit (1012) is adapted to heat the water used to flush the pre-filter (10). The reverse flushing pipe (12) is connected in series with the heating device (50), the rear outlet (30b), the rear filter element (30), and the rear inlet (30a) along the water flow direction in the reverse flushing pipe (12). The reverse flushing pipe (12) is adapted to reverse the flow of hot water in the heating device (50) into the rear filter element (30) to flush the rear filter element (30). A control valve assembly is provided on the water production pipeline, the flushing water discharge pipeline (111), and the reverse flushing pipeline (12), and is adapted to switch the flow of the water production pipeline or control the flow of the forward flushing pipeline (11) and / or control the flow of the reverse flushing pipeline (12); The water supply pipeline includes: The first pipeline (101) is connected at one end to the tap water inlet and at the other end to the pre-inlet (10a); The second pipeline (301) is connected at one end to the pre-outlet (10b) and at the other end to the post-inlet (30a); The third pipeline (401) is connected at one end to the rear outlet (30b) and at the other end to the inlet of the pure water storage device (40). The control valve assembly also includes: The fourth switch valve (3011) is installed on the second pipeline (301) and is suitable for controlling the water flow between the pre-filter (10) and the post-filter (30); The water purification system also includes a precision filter element (20) connected in series on the second pipeline (301). There are two fourth switching valves (3011), one of which is located on the second pipeline (301) between the pre-filter (10) and the precision filter (20), and the other is located on the second pipeline (301) between the precision filter (20) and the post-filter (30).

2. The water purification system according to claim 1, characterized in that, The control valve assembly includes: The first switch valve (1011) is installed on the water supply pipeline located upstream of the pre-filter (10) and is suitable for controlling whether water is supplied to the pre-filter (10); The second switch valve (1111) is installed on the flushing water discharge pipe (111) and is adapted to control whether to discharge the flushing water in the pre-filter (10).

3. The water purification system according to claim 1 or 2, characterized in that, The backflushing line (12) includes a drain pipe section (122) connected to the rear inlet (30a), and the control valve assembly includes: A switching valve (120) is adapted to switch the connection between the pure water storage device (40) or the heating device (50) and the rear outlet (30b); The third switch valve (1221) is located on the drain section (122) of the back flushing pipeline (12) and is suitable for controlling the water flow of the drain section (122).

4. The water purification system according to claim 3, characterized in that, The switching valve (120) is a two-way valve with three valve ports. Two valve ports of the two-way valve are connected to the water production pipeline, and the other valve port of the two-way valve is connected to the reverse flushing pipeline (12).

5. The water purification system according to claim 3, characterized in that, The reverse flushing pipeline (12) includes an inlet pipe section (121), one end of which is connected to the hot water outlet of the heating device (50), and the other end is connected to the third pipeline (401) through the switching valve (120).

6. The water purification system according to claim 1 or 2, characterized in that, A booster pump (601) is installed on the water production pipeline located upstream of the pre-filter (10).

7. The water purification system according to claim 1 or 2, characterized in that, The drain end of the backwash pipe (12) merges with the flush water discharge pipe (111).

8. A water production control method for a water purification system, applicable to the water purification system according to any one of claims 1 to 7, wherein the water purification system has a regeneration mode, characterized in that, After receiving the command to start the regeneration mode, the water purification system performs the following steps; The control valve group opens the forward flushing pipeline (11), so that the tap water entering from the tap water inlet (100) directly or after heating flushes the pre-filter (10) and is then discharged from the flushing water discharge pipeline (111); And / or, the control valve group opens the reverse flushing pipeline (12) to reverse the flow of hot water from the heating device (50) into the post-filter (30) for hot water flushing.

9. The water production control method of the water purification system according to claim 8, characterized in that, After receiving the command to start the regeneration mode, the water purification system also performs the following steps; The heating unit (1012) is activated to heat the flushing water to flush the pre-filter (10) in the forward direction using hot water.

10. The water production control method of the water purification system according to claim 9, characterized in that, After the thermal regeneration mode of the pre-filter (10) and / or post-filter (30) is completed, the cooling mode is entered, which specifically includes the following steps: The heating unit (1012) is turned off, and the ambient temperature cooling water entering from the tap water inlet (100) is passed into the pre-filter (10) and discharged from the flushing water discharge pipe (111). And / or, the control valve group opens the outlet of the pure water storage device (40) and the post-filter (30), and reverses the flow of room temperature water in the pure water storage device (40) into the post-filter (30) for cooling, and discharges it from the drain section (122) of the reverse flushing pipeline (12).

11. The water production control method of the water purification system according to claim 10, characterized in that, The thermal regeneration mode and the cooling mode are controlled to alternate.

12. The water production control method of the water purification system according to any one of claims 9 to 11, characterized in that, The regeneration mode also includes a soaking step, specifically comprising the following steps: The water flow drive and the second switch valve (1111) are closed to soak the pre-filter (10) with hot water heated by the heating unit (1012); and / or the third switch valve (1221) is closed to soak the post-filter (30) with hot water in the heating device (50).

13. The water production control method of the water purification system according to any one of claims 9 to 11, characterized in that, In the hot regeneration mode, the temperature of the flushing water for the pre-filter (10) and post-filter (30) is greater than the ambient temperature but less than the boiling point of water.

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