CN117342722A - Water purification system - Google Patents

Abstract

The invention relates to the technical field of water purification, and discloses a water purification system, which includes: a water-making device, including a water-making pipeline and a pre-filter element and a post-filter element connected in series to the water-making pipeline; a water storage device, the water storage device includes a heating element; Device; backwash pipeline; when the water purification system executes the first backwash mode, hot water flows through the connecting pipeline, the pre-filter outlet, the pre-filter, the pre-filter inlet and the first drainage pipeline in sequence ; When the water purification system executes the second backwash mode, the water in the water storage device flows through the reversing structure to the rear filter element outlet, the rear filter element, the rear filter element water inlet and the first drainage pipeline. The present invention can Backwash the pre-filter element and post-filter element to extend the service life of the pre-filter element and post-filter element and extend the replacement cycle without frequent replacement. Compared with related technologies, the cost is lower and water safety can be ensured. The regeneration process of the carbon water purification unit in the in-line filter element and post-filter element is safe and simple.

Description

water purification system

Technical field

The present invention relates to the technical field of water purification, specifically to a water purification system.

Background technique

During the transportation process of tap water through the pipe network, it is inevitable that there will be contamination such as rust, sediment, organic matter and microorganisms. As people pay attention to water quality and safety, water purifiers with purification functions are gradually 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. The pretreatment filter element is used to remove organic matter, colloids, heavy metals, and sediment particles, etc.; the precision filter element is extremely precise, such as a reverse osmosis membrane filter element. It is the core treatment filter element of the water purification system; the post-treatment filter element is used to remove trace elements, adjust pH and drink taste, etc. Since activated carbon can effectively remove residual chlorine and other oxidizing substances that cause damage to the precision filter element RO filter, the activated carbon filter element is an indispensable and important component of the pretreatment filter element of the water purifier. However, the activated carbon filter element has a shorter lifespan than other filter elements. Not only does it require frequent core changes, but it also limits the nominal value of the rated water purification capacity of the entire machine.

Contents of the invention

In view of this, the present invention provides a water purification system to solve the problem of short service life of activated carbon filter elements and the need for frequent replacement.

The invention provides a water purification system, including:

A water-making device includes a water-making pipeline and a pre-filter element and a post-filter element connected in series to the water-making pipeline. The pre-filter element and the post-filter element include a carbon water purification unit. The pre-filter element has A front filter element water inlet and a front filter element water outlet, and the rear filter element has a rear filter element water inlet and a rear filter element water outlet;

A water storage device, the water storage device includes a heating device, the water storage device and the rear filter element water outlet are connected through a water outlet pipeline, and the water outlet pipeline is provided with a reversing structure;

The backwash pipeline includes a connecting pipeline connected in parallel between the water inlet of the pre-filter element and the water outlet of the pre-filter element, and a pipeline connecting the water inlet of the pre-filter element and the water inlet of the post-filter element respectively. first drainage line;

When the water purification system executes the first backwash mode, hot water flows through the connecting pipe, the pre-filter outlet, the pre-filter, the pre-filter inlet and the third A drainage pipeline, the water in the water storage device flows through the reversing structure to the rear filter element water outlet, the rear filter element, the rear filter element water inlet and the first drainage pipeline ;

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

Beneficial effects: When the water purification system produces water normally, the tap water flows along the water production pipeline to produce water, and finally flows to the water storage device, where it is stored for use by users. The water storage device includes a heating device, so the water can be heated. into the temperature required by the user. After the front filter element has been used for a period of time, it will absorb more impurities. Switch the water purification system to the first backwash mode to backwash the front filter element. The carbon water purification unit includes activated carbon. When the water purification system is in the first backwash mode, hot water flows through the connecting pipe, the pre-filter outlet, the pre-filter, the pre-filter inlet and the first drainage pipe in sequence. When the pre-filter element is reversely flushed, hot water can break the balance between activated carbon and pollutant adsorbates, causing pollutants to be analyzed and desorbed. It can effectively strip and remove impurities adsorbed by the pre-filter element, thereby restoring the activated carbon in the pre-filter element. With partial adsorption capacity, regeneration is achieved. The flushing water with impurities flows out from the inlet of the pre-filter element and is discharged from the first drainage pipe. When the post-filter element absorbs more impurities after being used for a period of time, switch the water purification system to the second backwash mode to backwash the post-filter element. When the water purification system is in the second backwash mode, the hot water in the water storage device enters the rear filter element from the rear filter element water outlet through the reversing structure, and reversely flushes the rear filter element. Water can break the balance between activated carbon and pollutant adsorbates, desorb pollutants, and effectively strip and remove impurities adsorbed by the post-filter element, thereby restoring part of the adsorption capacity of the activated carbon in the post-filter element and achieving regeneration. The water flows out from the water inlet of the rear filter element and is discharged from the first drainage pipe.

Therefore, this water purification system can backwash the pre-filter element and post-filter element, extend the service life of the pre-filter element and post-filter element, extend the replacement cycle, and does not need to be replaced frequently. Compared with related technologies, the cost is lower, and It can ensure water safety, and the regeneration process of the carbon water purification unit in the pre-filter and post-filter is safe and simple.

In an optional embodiment, the pre-filter water inlet is connected to a water inlet pipeline connected to the tap water inlet, the pre-filter water inlet is also connected to the first drainage pipeline, and the first The drainage pipeline is equipped with a first on-off valve;

The water production device further includes a fine filter element, the fine filter element has a fine filter element water inlet, a pure water inlet and a waste water outlet, and the fine filter element water inlet and the pre-filter element water outlet are connected through a first pipeline;

The rear filter element water inlet is connected to the pure water port through a second pipeline, the second pipeline is provided with a second switch valve, and the rear filter element water inlet is connected to the third drainage pipeline through a second drainage pipeline. A drainage pipeline is connected, and the second drainage pipeline is provided with a third on-off valve;

The water storage device has a water inlet end and a water outlet end, the water inlet end is connected to the rear filter element water outlet through a water outlet pipeline, and the water outlet end is connected to the water outlet pipeline;

The connecting pipeline connects the water inlet pipeline and the first pipeline or the water outlet of the pre-filter element;

The water purification system also includes a first pipeline switching structure and a second pipeline switching structure. The first pipeline switching structure has a first state that connects the water inlet pipeline to the pre-filter water inlet. The second state of connecting the water inlet pipeline and the connecting pipeline; the second pipeline switching structure has a third state of connecting the water outlet of the pre-filter element and the water inlet of the fine filter element. The fourth state in which the connecting pipeline is connected to the water outlet of the pre-filter element;

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

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 reversing structure is in the fifth state. , the second switching valve opens;

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

When the water purification system executes the second backwash mode, the reversing structure is in the sixth state, the second switch valve is closed, the post filter element is back flushed, and the post filter element is The water for reverse flushing is heated pure water.

Beneficial effects: When the water purification system produces water normally, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, the first switch valve is closed, and the second switch The valve opens and the third switch valve closes. At this time, the tap water enters the pre-filter through the pre-filter inlet. After being filtered by the pre-filter, it flows out from the pre-filter outlet and then enters the fine filter through the first pipeline for filtration. , the pure water formed by the fine filter element flows out from the pure water port, flows into the post-filter element through the second pipeline, is filtered again by the post-filter element, and flows to the water storage device through the water outlet pipe, where it is stored in the water storage device for users In use, the water storage device includes a heating device, so the water can be heated to the temperature required by the user for use by the user. After the front filter element has been used for a period of time, it will absorb more impurities. Switch the water purification system to the first backwash mode to backwash the front filter element. When the water purification system is in the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first switch valve is opened. At this time, water enters the water inlet pipe and flows to the connecting pipe. After passing through the connecting pipe, it enters the pre-filter element from the outlet of the pre-filter element and reversely flushes the pre-filter element. It is hot water, so it can effectively strip and remove the impurities adsorbed by the pre-filter element. The flushing water with impurities flows out from the inlet of the pre-filter element and is discharged from the first drainage pipe. When the post-filter element absorbs more impurities after being used for a period of time, switch the water purification system to the second backwash mode to backwash the post-filter element. When the water purification system is in the second backwash mode, the reversing structure is in the sixth state, the second switch valve is closed, the third switch valve is opened, and the hot water in the water storage device passes through the water outlet pipe and flows from the rear of the rear filter element. The water outlet of the post-filter element enters the post-filter element, and the post-filter element is reversely flushed. Since the water for back-flush of the post-filter element is hot water, it can effectively strip and remove the impurities adsorbed by the post-filter element, and then the water flow flows from After the water inlet of the rear filter element flows out, it is discharged from the second drainage pipe.

Therefore, this water purification system can backwash the pre-filter element and post-filter element, extending the service life of the pre-filter element and post-filter element. It does not need to be replaced frequently. Compared with related technologies, the cost is lower and water safety can be ensured. .

In an optional implementation, the water inlet pipeline is provided with a fourth on-off valve, and the water purification system also has a soaking mode. When the water purification system executes the soaking mode, the first on-off valve , the second switching valve, the third switching valve, and the fourth switching valve are closed.

Beneficial effects: During the first backwash mode and the second backwash mode, the second switch valve is always closed, first the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the reversing structure In the sixth state, after the hot water has fully entered the post-filter element and the pre-filter element, the first on-off valve, the third on-off valve and the fourth on-off valve are closed. At this time, with the cooperation of the fourth on-off valve and the first on-off valve Next, the pre-filter element is fully soaked in hot water. Under the action of the third switch valve, the post-filter element is fully soaked so that the impurities adsorbed by the post-filter element and the pre-filter element fall off. After soaking for a period of time, turn on the first switch valve, the third on-off valve and the fourth on-off valve are opened, and the flowing hot water is used to backwash the rear filter element and the pre-filter element. The flushing water used to back-flush the pre-filter element is discharged through the first drainage pipe, and the back-flush water is discharged through the first drainage pipe. The flushing water used for reverse flushing of the filter element is discharged through the second drainage pipe. It can further improve the backwashing effect of the post-filter and pre-filter.

In an optional implementation, the water purification system also has a first cooling mode and a second cooling mode; when the water purification system executes the first cooling mode, the first pipeline switching structure is in In the second state, the second pipeline switching structure is in the fourth state, the pre-filter element is reversely flushed, and the water used for backwashing the pre-filter element is normal temperature tap water; the purifier When the water system executes the second cooling mode, the reversing structure is in the fifth state, the post-filter element is back-flushed, and the water used for back-flush of the post-filter element is pure water at normal temperature.

Beneficial effects: Since in the first backwash mode and the second backwash mode, the water used to backwash the pre-filter element and post-filter element is hot water, and the fine filter element is usually not resistant to high temperatures, so after the backwash mode ends, Before the water production mode, the water purification system is switched to the first cooling mode and the second cooling mode. The first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the reversing structure is in the fifth state. status, normal temperature tap water enters the water inlet pipe and flows to the connecting pipe. After passing through the connecting pipe, it enters the pre-filter element from the pre-filter element water outlet. The pre-filter element is reversely flushed. The water flowing out from the pre-filter element water inlet finally passes through The first drain line discharges. After the unheated normal temperature pure water in the water storage device passes through the water outlet pipe, it enters the rear filter element from the rear filter element water outlet. The rear filter element is reversely flushed, and the water flows out from the rear filter element water inlet. The water is finally discharged through the second drain line. Therefore, after the first cooling mode and the second cooling mode, there is no hot water in the pre-filter element, which can avoid damage to the fine filter element due to hot water flowing to the fine filter element during normal water production.

In an optional embodiment, the water purification system has the function of alternately operating the first backwash mode and the first cooling mode, and/or the second backwash mode and the second cooling mode. The working state of alternating modes.

Beneficial effects: By alternately operating the first backwash mode and the first cooling mode, and/or the second backwash mode and the second cooling mode, the best regeneration effect can be achieved.

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

Beneficial effects: The heating component is externally placed on the pre-filter element, which does not affect the replacement of the pre-filter element.

In an optional embodiment, the membrane shell of the pre-filter element is provided with a heating component.

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

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

Beneficial effects: Backwash modes at different temperatures can be achieved by adjusting the power of the heating component.

In an optional embodiment, the water storage device includes a pure water tank, the pure water tank has the water inlet end and the pure water tank outlet, and the pure water tank outlet is connected to the heating device. The heating water inlet is connected, the heating device has the water outlet end, and the water outlet end is connected with the water inlet.

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

Beneficial effects: The first pipeline switching structure is a first three-way valve. By controlling the first three-way valve, the first state of communication between the water inlet pipeline and the pre-filter element water inlet can be achieved, and the water inlet pipeline can be connected with the connecting pipeline. The second state has a simple structure and is easy to control.

In an optional embodiment, the connecting pipeline is connected to the first pipeline, and the second pipeline switching structure includes a The second three-way valve.

Beneficial effects: The second pipeline switching structure is a second three-way valve. By controlling the second three-way valve, the third state of connecting the water outlet of the pre-filter element and the water inlet of the fine filter element can be realized, and the connecting pipeline and the pre-filter element can be connected. The fourth state where the water outlet is connected has a simple structure and is easy to control.

In an optional embodiment, the water outlet end and the water outlet pipeline are connected through a third pipeline, and the reversing structure includes a connection point provided at the connection point between the water outlet pipeline and the third pipeline. The third three-way valve.

Beneficial effects: The reversing structure is a third three-way valve. By controlling the third three-way valve, the fifth state in which the rear filter element water outlet and the water inlet end are connected in a forward direction can be realized, and the water outlet end and the rear filter element water outlet can be reversed. The sixth state of connectivity has a simple structure and is easy to control.

In an optional embodiment, the water purification system further includes a coarse filter element. The coarse filter element has a coarse filter element water inlet and a coarse filter element water outlet. The coarse filter element water inlet is connected to the tap water inlet. , the water outlet of the coarse filter element and the water inlet of the pre-filter element are connected through the water inlet pipeline.

Beneficial effects: By setting the coarse filter element, in the water production mode, the tap water is first filtered by the coarse filter element, and then enters the pre-filter element for filtration; in the backwash mode, the tap water is first filtered by the coarse filter element, and then through the connection The pipeline flows to the pre-filter element, which can avoid contamination of the pre-filter element by impurities in tap water during backwash mode.

In an optional embodiment, the waste water port is connected to a concentrated water pipe, the concentrated water pipe is provided with a waste water solenoid valve, and the first drainage pipeline and the second drainage pipeline are both connected to the concentrated water pipe. Pipeline connection.

Beneficial effects: The flushing water for reverse flushing of the pre-filter element and the post-filter element is discharged through the concentrated water pipe, and the structure is simple and compact.

Description of drawings

In order to more clearly explain the specific embodiments of the present invention or the technical solutions in the prior art, the drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

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

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

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

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

Figure 5 is a schematic diagram of the water purification system shown in Figure 1 when it is in backwash mode;

Figure 6 is a schematic diagram of the water purification system shown in Figure 2 when it is in backwash mode;

Figure 7 is a schematic diagram of the water purification system shown in Figure 1 when it is in cooling mode;

Figure 8 is a schematic diagram of the water purification system shown in Figure 2 when it is in cooling mode.

Explanation of reference symbols:

1. Pre-filter element; 101. Pre-filter element water inlet; 102. Pre-filter element water outlet; 2. Tap water inlet; 3. Water inlet pipeline; 4. First drainage pipeline; 5. First switch valve; 6. Fine filter element; 601, fine filter element water inlet; 602, pure water inlet; 603, waste water outlet; 7, first pipeline; 8, post filter element; 801, post filter element water inlet; 802, post filter element water outlet; 9. Second pipeline; 10. Second on-off valve; 11. Second drainage pipeline; 12. Third on-off valve; 13. Pure water tank; 1301. Water inlet; 1302. Pure water tank outlet; 14 , heating device; 1401, heating water inlet; 1402, water outlet; 15, water inlet; 16, connecting pipeline; 17, fourth switch valve; 18, heating component; 19, first three-way valve; 20, second Three-way valve; 21. Third three-way valve; 22. Third pipeline; 23. Coarse filter element; 2301, Coarse filter element water inlet; 2302, Coarse filter element water outlet; 24, Concentrated water pipe; 25, Waste water Solenoid valve; 26. Booster pump.

Detailed ways

In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

In order to achieve the goal of long life of water purifier filter elements and less replacement of elements, the industry's main efforts to extend the life of carbon filter elements are by improving carbon materials, manufacturing processes and increasing the amount of carbon, which can improve water purification performance and life to a certain extent, but in general There is a failure point, and it is necessary to find a breakthrough to improve the life of the activated carbon filter element.

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. Changing the conditions can break the adsorption balance and cause the adsorbates to undergo analytical detachment; the chemical adsorption process is irreversible and is essentially The surface functional groups of activated carbon form stable complexes with pollutant molecules. In the specific process of action, activated carbon first performs mainly physical adsorption. After the physical adsorption is close to saturation, chemical adsorption intervenes and directly fails completely. In view of the above characteristics, find ways to break the balance between activated carbon and adsorbates, make physical adsorption proceed in the opposite direction, and at the same time slow down the reaction process of chemical adsorption, regenerate activated carbon and restore adsorption capacity, so as to extend the service life.

After research, the main methods to extend the life of carbon filter elements through regeneration include physical high temperature, steam or vibration, and chemical reagents. For example, patent CN217350956U discloses a self-cleaning purification device that regenerates activated carbon fibers through high-temperature steam. However, this method is suitable for large-scale purification treatment devices in the petrochemical and environmental protection industries. The process implementation requirements are high and is not suitable for household water purifiers; Patent CN113788554A discloses a method of clearing the gaps between activated carbon and restoring its adsorption capacity through water vapor, vibration and physical impact. It can realize the self-completed regeneration process, but not only the installation is complex, but also additional flocculants are required, which cannot be guaranteed. Usage process and safety of drinking water; Patent CN202654783U discloses a high-efficiency activated carbon fiber filtration device that regenerates the filter element by soaking in chlorine dioxide and adding high-temperature steam. However, the introduction of the chemical substance chlorine dioxide cannot guarantee the safety of water quality; patent CN101844075A discloses an activated carbon regeneration device and method. Through electrochemical methods, pollutants adsorbed in the activated carbon are decomposed and reduced in the electrolytic state and then desorbed to achieve activated carbon regeneration. However, there are metal substances in the solution. Precipitation cannot ensure the safety of drinking water and increases electricity consumption.

Small size is the current main development trend of the market, and low cost will help improve product competitiveness. Through the above analysis, it is necessary to find a more effective general technology for carbon filter element life. The purpose of this embodiment is to solve the problems of short carbon filter life and frequent core replacement, improve the life of the carbon filter core, and at the same time meet the requirements of energy conservation and environmental protection, and enhance product competitiveness.

The following describes embodiments of the present invention with reference to FIGS. 1 to 8 .

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

The water-making device includes a water-making pipeline and a pre-filter element 1 and a post-filter element 8 that are connected in series to the water-making pipeline. The pre-filter element 1 and the post-filter element 8 contain a carbon water purification unit. The pre-filter element 1 has a pre-filter element. The water inlet 101 and the front filter element water outlet 102, the rear filter element 8 has a rear filter element water inlet 801 and a rear filter element water outlet 802.

The water storage device includes a heating device 14. The water storage device is connected to the rear filter element water outlet 802 through a water outlet pipeline, and the water outlet pipeline is provided with a reversing structure.

The backwash pipeline includes a connecting pipeline 16 connected in parallel between the pre-filter water inlet 101 and the pre-filter water outlet 102, and a first drainage pipe connecting the pre-filter water inlet 101 and the post-filter water inlet 801 respectively. Road 4.

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

When the water purification system executes the second backwash mode, the water in the water storage device flows through the reversing structure to the rear filter element outlet 802, the rear filter element 8, the rear filter element water inlet 801 and the first drainage pipeline 4.

In this embodiment, when the water purification system produces water normally, the tap water flows along the water production pipeline for water production, and finally flows to the water storage device, where it is stored for use by users. The water storage device includes a heating device, so it can Heat the water to the temperature required by the user for use. After the front filter element has been used for a period of time, it will absorb more impurities. Switch the water purification system to the first backwash mode to backwash the front filter element. The carbon water purification unit includes activated carbon. When the water purification system is in the first backwash mode, hot water flows through the connecting pipe, the pre-filter outlet, the pre-filter, the pre-filter inlet and the first drainage pipe in sequence. The pre-filter element is reversely flushed. Hot water can break the balance between activated carbon and pollutant adsorbates, causing pollutants to be analyzed and desorbed. It can effectively strip and remove the impurities adsorbed by the pre-filter element, thereby restoring the activated carbon in the pre-filter element. With partial adsorption capacity, regeneration is achieved. The flushing water with impurities flows out from the inlet of the pre-filter element and is discharged from the first drainage pipe. When the post-filter element is used for a period of time and absorbs more impurities, switch the water purification system to the second backwash mode to backwash the post-filter element. When the water purification system is in the second backwash mode, the hot water in the water storage device enters the rear filter element from the rear filter element outlet through the reversing structure, and reversely flushes the rear filter element. Water can break the balance between activated carbon and pollutant adsorbates, desorb pollutants, and effectively strip and remove impurities adsorbed by the post-filter element, thereby restoring part of the adsorption capacity of the activated carbon in the post-filter element and achieving regeneration. The water flows out from the water inlet of the rear filter element and is discharged from the first drainage pipe.

Therefore, this water purification system can backwash the pre-filter element and post-filter element, extend the service life of the pre-filter element and post-filter element, extend the replacement cycle, and does not need to be replaced frequently. Compared with related technologies, the cost is lower, and It can ensure water safety, and the regeneration process of the carbon water purification unit in the pre-filter and post-filter is safe and simple.

Specifically, in one embodiment, the pre-filter water inlet 101 is connected to a water inlet pipeline 3 connected to the tap water inlet 2. The pre-filter water inlet 101 is also connected to a first drainage pipeline 4. The first drainage pipeline 4 is provided with The first switching valve 5.

The water production device also includes a fine filter element 6. The fine filter element 6 has a fine filter element water inlet 601, a pure water inlet 602 and a waste water inlet 603. The fine filter element water inlet 601 and the pre-filter element water outlet 102 are connected through the first pipeline 7.

The rear filter element water inlet 801 and the pure water inlet 602 are connected through the second pipeline 9. The second pipeline 9 is provided with a second on-off valve 10. The rear filter element water inlet 801 is connected to the first drainage pipe through the second drainage pipeline 11. Road 4 is connected, and the second drainage pipeline 11 is provided with a third on-off valve 12 .

The water storage device has a water inlet end 1301 and a water outlet end 1402. The water inlet end 1301 is connected to the rear filter element water outlet 802 through a water outlet pipeline, and the water outlet end 1402 is connected to the water outlet pipeline.

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

The first pipeline switching structure has a first state in which the water inlet pipeline 3 communicates with the pre-filter water inlet 101, and a second state in which the water inlet pipeline 3 communicates with the connecting pipeline 16.

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

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

The reversing structure has a fifth state in which the water outlet 802 of the rear filter element is in forward communication with the water inlet end 1301, and a sixth state in which the water outlet end 1402 is in reverse communication with the water outlet 802 of the rear filter element.

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

When the water purification system executes the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, the pre-filter element is backwashed, and the pre-filter element is backwashed. The water is heated tap water. When the water purification system executes the second backwash mode, the reversing structure is in the sixth state, the second switch valve 10 is closed, and the post-filter element 8 is reverse-flushed, and the water used to back-flush the post-filter element 8 is heated. Pure water.

In this embodiment, when the water purification system produces water normally, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, and the first switch valve 5 is closed. , the second switch valve 10 is opened, and the third switch valve 12 is closed. At this time, the tap water enters the pre-filter 1 through the pre-filter inlet 101. After being filtered by the pre-filter 1, it flows out from the pre-filter outlet 102, and then passes through The first pipeline 7 enters the fine filter element 6 for filtration. The pure water filtered by the fine filter element 6 flows out from the pure water port 602, flows into the post-filter element 8 through the second pipeline 9, and is filtered again by the post-filter element 8. The water outlet pipeline flows to the water storage device, where it is stored for use by the user. The water storage device includes a heating device 14, so the water can be heated to a temperature required by the user for use by the user. After the pre-filter element 1 has been used for a period of time, more impurities are adsorbed. The water purification system is switched to the first backwash mode, and the pre-filter element 1 can be back-flushed. When the water purification system is in the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first switch valve 5 is opened. At this time, water enters the water inlet pipe 3 and flows to the connecting pipe 16. After passing through the connecting pipe 16, it enters the pre-filter element 1 from the pre-filter element outlet 102, and reversely flushes the pre-filter element 1. The water used for backwashing the filter element 1 is hot water, so it can effectively strip and remove the impurities adsorbed by the pre-filter element 1. The flushing water with impurities flows out from the inlet of the pre-filter element 1 and is discharged from the first drainage pipe 4. When the post-filter element 8 is used for a period of time and absorbs more impurities, the water purification system is switched to the second backwash mode to backwash the post-filter element 8 . When the water purification system is in the second backwash mode, the reversing structure is in the sixth state, the second switch valve 10 is closed, the third switch valve 12 is opened, and the hot water in the water storage device passes through the water outlet pipe and flows from the rear filter element. The water outlet 802 of the rear filter element 8 enters the rear filter element 8, and the rear filter element 8 is reversely flushed. Since the water for backwashing the rear filter element 8 is hot water, the rear filter element 8 can be effectively adsorbed. The impurities are stripped and removed, and then the water flows out from the rear filter element water inlet 801 and then discharged from the second drainage pipe 11.

Therefore, the water purification system can reversely flush the pre-filter element 1 and the post-filter element 8, extending the service life of the pre-filter element 1 and the post-filter element 8. It does not need to be replaced frequently. Compared with related technologies, the cost is lower, and Can ensure water safety.

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

It should be noted that since the fine filter element 6 is usually not resistant to high temperatures, this embodiment avoids the fine filter element 6 when backwashing the pre-filter element 1 and the post-filter element 8 to avoid damage to the fine filter element 6 .

It should be noted that the water purification system also includes a pump (not shown in the figure), which is mainly a booster pump 26 and a water pump. The booster pump 26 is used to pressurize and control the opening and closing of the entire water purification system; the water pump Used to implement the user's water collection function.

For the program control of turning on and off each component and the operation of the whole machine, the start and stop of the booster pump 26, the power of the heating component 18, and the pipeline are mainly controlled based on relevant detection parameters (such as the amount of clean water, time, water temperature, liquid level, etc.) Control the opening and closing of the valve to achieve switching of various modes. Since the focus of this embodiment is to use hot water to backwash the pre-filter element 1 and the post-filter element 8, specific program control is not the focus of this embodiment and will not be introduced in detail in this embodiment.

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

In this embodiment, during the first backwash mode and the second backwash mode, the second switch valve 10 is always closed, and the first pipeline switching structure is first placed in the second state, and the second pipeline switching structure is placed in the fourth state. , the reversing structure is in the sixth state. After the hot water fully enters the post-filter element 8 and the pre-filter element 1, the first on-off valve 5, the third on-off valve 12 and the fourth on-off valve 17 are closed. At this time, in the fourth With the cooperation of the on-off valve 17 and the first on-off valve 5, the hot water pre-filter element 1 is fully soaked, and under the action of the third on-off valve 12, the post-filter element 8 is fully soaked, so that the post-filter element 8 and the pre-filter element are fully soaked. The impurities adsorbed by the filter element 1 fall off. After soaking for a period of time, open the first on-off valve 5, the third on-off valve 12 and the fourth on-off valve 17, and use flowing hot water to backwash the post-filter element 8 and the pre-filter element 1. , the flushing water used to backwash the pre-filter element 1 is discharged through the first drainage pipe 4, and the flushing water used to backwash the post-filter element 8 is discharged through the second drainage pipe 11. The backwashing effect on the post-filter element 8 and the pre-filter element 1 can be further improved.

In one embodiment, the water purification system also has a first cooling mode and a second cooling mode; when the water purification system executes the first cooling mode, the first pipeline switching structure is in the second state, and the second pipeline switching structure is in the third state. In the fourth state, the pre-filter element 1 is reversely flushed, and the water used to reversely flush the pre-filter element 1 is normal temperature tap water; when the water purification system executes the second cooling mode, the reversing structure is in the fifth state, and the post-filter element 8 is reversely flushed. Backwashing is performed, and the water used for backwashing the post-filter element 8 is pure water at normal temperature.

In this embodiment, since in the first backwash mode and the second backwash mode, the water used to backwash the pre-filter element 1 and the post-filter element 8 is hot water, and the fine filter element 6 is usually not resistant to high temperatures, so in After the backwash mode is completed and before the water production mode, the water purification system is switched to the first cooling mode and the second cooling mode, the first pipeline switching structure is in the second state, and the second pipeline switching structure is in the fourth state. The reversing structure is in the fifth state. After entering the water inlet pipe 3, the normal temperature tap water flows to the connecting pipe 16. After passing through the connecting pipe 16, it enters the pre-filter element 1 from the pre-filter element outlet 102 and reversely flushes the pre-filter element 1. , the water flowing out from the pre-filter water inlet 101 is finally discharged through the first drainage pipe 4. After the unheated normal-temperature pure water in the water storage device passes through the water outlet pipe, it enters the rear filter element 8 from the rear filter element outlet 802 of the rear filter element 8, and reversely flushes the rear filter element 8. The water flowing out of the water inlet 801 is finally discharged through the second drainage pipe 11 . Therefore, after the first cooling mode and the second cooling mode, there is no hot water in the pre-filter element 1, which can avoid damage to the fine filter element 6 caused by hot water flowing to the fine filter element 6 during normal water production.

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

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

Specifically, it should be noted that the first backwash mode and the second backwash mode specifically include various forms such as running water flushing, soaking, long-term flushing, short-time flushing, etc., and can be obtained by running the backwash mode and the cooling mode alternately. Optimum regeneration effect.

Among them, the first backwash mode and the second backwash mode backwash the pre-filter element 1 and the post-filter element 8, and the hot water temperature for immersion is greater than the ambient temperature and less than the boiling point of water.

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

In this embodiment, the heating component 18 is externally placed on the pre-filter element 1 and does not affect the replacement of the pre-filter element 1 .

Specifically, when the water purification system produces water normally, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, the first switch valve 5 is closed, and the second pipeline switching structure is in the third state. The on-off valve 10 is opened, and the third on-off valve 12 is closed. At this time, the tap water enters the pre-filter 1 through the pre-filter inlet 101. After being filtered by the pre-filter 1, it flows out from the pre-filter outlet 102, and then passes through the first pipe. Road 7 enters the fine filter element 6 for filtration. The pure water filtered by the fine filter element 6 flows out from the pure water port 602 and flows into the post-filter element 8 through the second pipeline 9. It is filtered again by the post-filter element 8 and then passes through the water outlet pipe. It flows to the water storage device and is stored in the water storage device for use by the user. The water storage device includes a heating device 14, so the water can be heated to the temperature required by the user for use by the user. After the pre-filter element 1 has been used for a period of time, more impurities are adsorbed. The water purification system is switched to the first backwash mode, and the pre-filter element 1 can be back-flushed. When the water purification system is in the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first switch valve 5 is opened. At this time, water enters the water inlet pipe 3 and flows to the connecting pipe 16. After being heated by the components on the connecting pipe 16, it enters the pre-filter element 1 from the pre-filter element outlet 102, and reversely flushes the pre-filter element 1. Since the water used for reverse flushing of the pre-filter element 1 is hot water, the impurities adsorbed by the pre-filter element 1 can be effectively stripped and removed. The flushing water with impurities flows out from the inlet of the pre-filter element 1 and then flows through the first drainage pipe. 4 discharge. When the post-filter element 8 is used for a period of time and absorbs more impurities, the water purification system is switched to the second backwash mode to backwash the post-filter element 8 . When the water purification system is in the second backwash mode, the reversing structure is in the sixth state, the second switch valve 10 is closed, the third switch valve 12 is opened, and the hot water in the water storage device passes through the water outlet pipe and flows from the rear filter element. The water outlet 802 of the rear filter element 8 enters the rear filter element 8, and the rear filter element 8 is reversely flushed. Since the water for backwashing the rear filter element 8 is hot water, the rear filter element 8 can be effectively adsorbed. The impurities are stripped and removed, and then the water flows out from the rear filter element water inlet 801 and then discharged from the second drainage pipe 11.

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

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

Specifically, when the water purification system produces water normally, the first pipeline switching structure is in the first state, the second pipeline switching structure is in the third state, the reversing structure is in the fifth state, the first switch valve 5 is closed, and the The second switch valve 10 is opened, and the third switch valve 12 is closed. At this time, the tap water enters the pre-filter 1 through the pre-filter inlet 101. After being filtered by the pre-filter 1, it flows out from the pre-filter outlet 102, and then passes through the first The pipeline 7 enters the fine filter element 6 for filtration. The pure water filtered by the fine filter element 6 flows out from the pure water port 602 and flows into the post-filter element 8 through the second pipeline 9. It is filtered again by the post-filter element 8 and then passes through the outlet pipe. The water path flows to the water storage device, where it is stored for use by the user. The water storage device includes a heating device 14, so the water can be heated to the temperature required by the user for use by the user. After the pre-filter element 1 has been used for a period of time, more impurities are adsorbed. The water purification system is switched to the first backwash mode, and the pre-filter element 1 can be back-flushed. When the water purification system is in the first backwash mode, the first pipeline switching structure is in the second state, the second pipeline switching structure is in the fourth state, and the first switch valve 5 is open. At this time, water enters the water inlet pipe 3 and flows to the connecting pipe 16. After passing through the connecting pipe 16, it enters the pre-filter element 1 from the pre-filter element outlet 102, and reversely flushes the pre-filter element 1. Since the pre-filter element The membrane shell of 1 is provided with a heating component 18. Heating the heating component 18 can make the water for reverse flushing of the pre-filter 1 become hot water. Therefore, the impurities adsorbed by the pre-filter 1 can be effectively stripped and removed, and the flushing with impurities can The water flows out from the inlet of the pre-filter element 1 and is discharged from the first drainage pipe 4. When the post-filter element 8 is used for a period of time and absorbs more impurities, the water purification system is switched to the second backwash mode to backwash the post-filter element 8 . When the water purification system is in the second backwash mode, the reversing structure is in the sixth state, the second switch valve 10 is closed, the third switch valve 12 is opened, and the hot water in the water storage device passes through the water outlet pipe and flows from the rear filter element. The water outlet 802 of the rear filter element 8 enters the rear filter element 8, and the rear filter element 8 is reversely flushed. Since the water for backwashing the rear filter element 8 is hot water, the rear filter element 8 can be effectively adsorbed. The impurities are stripped and removed, and then the water flows out from the rear filter element water inlet 801 and then discharged from the second drainage pipe 11.

In one embodiment, the water purification system includes a water temperature detection element and a controller. The controller is communicatively connected with the water temperature detection element and the heating component 18. The water temperature detection element can detect the first backwash mode and the second backwash mode. The controller can adjust the power of the heating component 18 and the heating device 14 according to the temperature of the water used for backwashing the filter element 1 and the post-filter element 8 .

In this embodiment, backwash modes at different temperatures can be achieved by adjusting the power of the heating component 18 .

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

In this embodiment, when the water purification system is producing water normally, as shown in Figures 3 and 4, the bold lines in the figures indicate the flow direction of the water. The first pipeline switching structure is in the first state, and the second pipeline switching structure is in the first state. In the third state, the reversing structure is in the fifth state, the first on-off valve 5 is closed, the second on-off valve 10 is open, and the third on-off valve 12 is closed. At this time, the tap water enters the pre-filter 1 through the pre-filter inlet 101, After being filtered by the pre-filter element 1, it flows out from the pre-filter element outlet 102, and then enters the fine filter element 6 for filtration through the first pipeline 7. The pure water filtered by the fine filter element 6 flows out from the pure water outlet 602, and passes through the first pipeline 7. The second pipeline 9 flows into the post-filter 8. After being filtered again by the post-filter 8, it flows to the pure water tank 13 for storage through the water outlet pipeline. When the user needs to draw water, the water in the pure water tank 13 is pumped to the heating device 14. The heating device 14 works or does not work, and then flows out from the water inlet 15 for users to use. After the pre-filter element 1 and the post-filter element 8 are used for a period of time, more impurities are adsorbed. The water purification system is switched to the first backwash mode and the second backwash mode. The pre-filter element 1 and the post-filter element 8 can be cleaned. 8 Perform reverse flushing. When the water purification system is in the first backwash mode and the second backwash mode, as shown in Figure 5 and Figure 6, the bold lines in the figures indicate the flow direction of the water, the first pipeline switching structure is in the second state, and the second pipeline The switching structure is in the fourth state, the reversing structure is in the sixth state, the first switching valve 5 is open, the second switching valve 10 is closed, and the third switching valve 12 is open. At this time, water enters the water inlet pipe 3 and flows to the connecting pipe 16. After passing through the connecting pipe 16, it enters the pre-filter element 1 from the pre-filter element outlet 102, and reversely flushes the pre-filter element 1. The water used for backwashing the filter element 1 is hot water, so it can effectively strip and remove the impurities adsorbed by the pre-filter element 1. The flushing water with impurities flows out from the inlet of the pre-filter element 1 and is discharged from the first drainage pipe 4. The water pump in the pure water tank 13 is sent to the heating device 14. The heating device 14 works to generate hot water. After the hot water passes through the water outlet pipe, it enters the rear filter element 8 from the rear filter element water outlet 802 of the rear filter element 8. The post-filter element 8 is reverse-flushed. Since the water used for back-flushing the post-filter element 8 is hot water, the impurities adsorbed by the post-filter element 8 can be effectively stripped and removed. Afterwards, the water flow flows out from the post-filter element water inlet 801. The second drainage pipe 11 discharges. After the first backwash mode and the second backwash mode, the water purification system switches to the first cooling mode and the second cooling mode, as shown in Figures 7 and 8. The bold lines in the figures indicate the flow direction of the water. The first pipe The road switching structure is in the second state, the second pipeline switching structure is in the fourth state, the reversing structure is in the fifth state, the first switching valve 5 is open, the second switching valve 10 is closed, the third switching valve 12 is open, and the normal temperature tap water After entering the water inlet pipe 3, it flows to the connecting pipe 16. After passing through the connecting pipe 16, it enters the pre-filter element 1 from the pre-filter element outlet 102. The pre-filter element 1 is reversely flushed. The water flowing out from the pre-filter element water inlet 101 The water is finally discharged through the first drainage pipe 4. After the normal temperature pure water in the pure water tank 13 flows through the water outlet pipeline in the reverse direction, it enters the rear filter element 8 from the rear filter element outlet 802 of the rear filter element 8, and reversely flushes the rear filter element 8. The water flowing out of the filter element water inlet 801 is finally discharged through the second drainage pipe 11 . Therefore, after the first cooling mode and the second cooling mode, there is no hot water in the pre-filter element 1, which can avoid damage to the fine filter element 6 caused by hot water flowing to the fine filter element 6 during normal water production.

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

In an embodiment not shown in the figure, the heating device 14 may be a thermal tank.

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

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

Specifically, the first three-way valve 19 has a first port close to the tap water inlet 2, a second port close to the pre-filter 1, and a third port connected to the connecting pipe 16. When the first port is connected to the third port, When the two ports are connected, it is the first state, and when the first port and the third port are connected, it is the second state. Specifically, in the water production mode, the first three-way valve 19 is switched to a first state that connects the first port and the second port. In the backwash mode and cooling mode, the first three-way valve 19 is switched to a first state that connects the first port to the second port. The second state of connection with the third port.

In an embodiment not shown in the figure, the first pipeline switching structure may include switching valves respectively provided on the connecting pipeline 16 and the water inlet pipeline 3 and close to the pre-filter element 1. By controlling these two switching valves switch to realize switching of different states of the first pipeline switching structure.

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

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

Specifically, the second three-way valve 20 has a fourth port close to the pre-filter element 1, a fifth port close to the fine filter element 6, and a sixth port connected to the connecting pipeline 16. When the fourth port is connected to the When the five ports are connected, it is the third state, and when the fifth port and the sixth port are connected, it is the fourth state. Specifically, in the water production mode, the second three-way valve 20 is switched to a third state to connect the fourth port and the fifth port. In the backwash mode and cooling mode, the second three-way valve 20 is switched to a third state to connect the fifth port. The fourth state connected to the sixth port.

In an embodiment not shown in the figure, the second pipeline switching structure may include switching valves respectively provided on the first pipeline 7 and the connecting pipeline 16, which is realized by controlling the switching of these two switching valves, The second pipeline switching structure switches between different states.

In one embodiment, the water outlet end 1402 and the water outlet pipeline are connected through the third pipeline 22 , and the reversing structure includes a third three-way valve 21 located at the connection point between the water outlet pipeline and the third pipeline 22 .

In this embodiment, the reversing structure is the third three-way valve 21. By controlling the third three-way valve 21, the fifth state in which the rear filter element water outlet 802 and the water inlet end 1301 are positively connected can be achieved and the water outlet end can be The sixth state in which 1402 is reversely connected to the rear filter element water outlet 802 has a simple structure and is easy to control.

Specifically, the third three-way valve 21 has a seventh port close to the rear filter element outlet 802, an eighth port close to the water inlet end 1301 of the water storage device, and a ninth port connected to the third pipeline 22. The port, when the seventh port is connected to the eighth port, is in the fifth state, and when the ninth port is connected to the seventh port, it is in the sixth state. Specifically, in the water production mode, the third three-way valve 21 is switched to the fifth state to connect the seventh port and the eighth port. In the backwash mode and cooling mode, the third three-way valve 21 is switched to the fifth state to connect the ninth port. The sixth state connected to the seventh port.

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

In this embodiment, by setting the coarse filter element 23, in the water production mode, the tap water is first filtered by the coarse filter element 23, and then enters the pre-filter 1 for filtration; in the backwash mode, the tap water first passes through the coarse filter element 23 After filtering, it flows to the pre-filter element 1 through the connecting pipe 16, which can avoid contamination of the pre-filter element 1 by impurities in tap water during backwash mode.

In one embodiment, the waste water port 603 is connected to a concentrated water pipe 24 , the concentrated water pipe 24 is provided with a waste water solenoid valve 25 , and both the first drainage pipe 4 and the second drainage pipe 11 are connected to the concentrated water pipe 24 .

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

Although the 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 invention, and such modifications and variations fall within the scope of the appended rights. within the scope of the requirements.

Claims (13)

1. A water purification system, comprising:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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