Water purification system

Abstract

The present invention relates to the technical field of water purification, and discloses a water purification system, comprising a pre-filter element, a post-filter element, and a pipeline switching structure, wherein the pre-filter element water inlet is provided with a water inlet pipeline connected to a tap water inlet, the post-filter element water inlet is connected to the pre-filter element water outlet, the post-filter element water outlet is connected to a water intake, the post-filter element water outlet and the pre-filter element water outlet are further connected to a drain outlet via a drain pipeline, the drain pipeline is provided with a drain valve, the pre-filter element and the post-filter element both contain a carbon water purification unit, the regeneration water inlet is connected to the water inlet pipeline, the regeneration water outlet is connected to the post-filter element water inlet, and the pipeline switching structure has a first state in which the pre-filter element water outlet is connected to the post-filter element water inlet, and a second state in which the regeneration water outlet is connected to the post-filter element water inlet. The present invention can simultaneously perform active regeneration on the pre-filter element and the post-filter element, thereby extending the service life of both, reducing the replacement frequency, and reducing the cost, and also increasing the rated water purification capacity of the entire water purification system, with excellent economic benefits.

Description

Technical Field

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

[0002] During the pipeline transportation process, tap water is inevitably contaminated by rust, silt, organic matter, and microorganisms. A water purifier with a purification function can effectively remove impurities and purify tap water. The water purification system of a water purifier typically includes a pre-treatment filter element, a fine filter element, and a post-treatment filter element. The pre-treatment filter element is used to remove organic matter, colloids, heavy metals, and silt particles. The fine filter element (RO filter element) is extremely precise, such as the reverse osmosis membrane filter element, and 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 improve drinking taste.

[0003] The activated carbon component in the pre-treatment filter element and the post-treatment filter element can effectively remove oxidizing substances such as residual chlorine. Therefore, the activated carbon component is an indispensable and important component of the pre-treatment filter element and the post-treatment filter element. However, the activated carbon component in the pre-treatment filter element and the post-treatment filter element has a shorter lifespan than other filter elements, resulting in frequent replacement of the pre-treatment filter element and the post-treatment filter element, high cost and also limiting the nominal value of the rated water purification capacity of the whole machine. Summary of the Invention

[0004] In view of this, the present invention provides a water purification system to solve the problem in the prior art that pre-treatment filter elements and post-treatment filter elements need to be replaced frequently and at high cost.

[0005] The present invention provides a water purification system, comprising a pre-filter element, a post-filter element, a regeneration pipeline and a pipeline switching structure, wherein the pre-filter element contains a carbon water purification unit, the pre-filter element has a pre-filter element water inlet and a pre-filter element water outlet, the pre-filter element water inlet is connected to a water inlet pipeline connected to a tap water inlet, the post-filter element contains a carbon water purification unit, the post-filter element has a post-filter element water inlet and a post-filter element water outlet, the post-filter element water inlet is connected to the pre-filter element water outlet, the post-filter element water outlet is connected to a water intake, the post-filter element water outlet and the pre-filter element water outlet are also connected to a drain outlet via a drain pipeline, a drain valve is provided on the drain pipeline, and the regeneration pipeline has a regeneration water inlet , regeneration water outlet, the regeneration water inlet is connected to the water inlet pipe, the regeneration water outlet is connected to the post-filter element water inlet, the pipeline switching structure has a first state in which the pre-filter element water outlet is connected to the post-filter element water inlet, and a second state in which the regeneration water outlet is connected to the post-filter element water inlet, the water purification system has a water purification mode and a thermal regeneration mode, in the water purification mode, the pipeline switching structure is in the first state, the drain valve is closed, the thermal regeneration mode includes a flushing state, in the flushing state, the pipeline switching structure is in the second state, the drain valve is opened, the pre-filter element and the post-filter element are flushed, and the flushing water is hot water.

[0006] Beneficial effect: In the water purification mode, the pipeline switching structure is in the first state, the drain valve is closed, and the tap water flows through the water inlet pipeline in sequence through the pre-filter element and the post-filter element to achieve tap water purification. The thermal regeneration mode includes a flushing state. In the flushing state, the pipeline switching structure is in the second state, the drain valve is opened, and hot water flows into the pre-filter element through the water inlet pipeline in sequence and flows into the post-filter element through the regeneration pipeline to perform hot flushing on the pre-filter element and the post-filter element at the same time. Hot water not only has a flushing effect, but also can break the balance between the activated carbon and the pollutant adsorbent, so that the pollutants are analyzed and desorbed, thereby restoring part of the adsorption capacity of the carbon water purification unit and achieving the regeneration of the pre-filter element and the post-filter element. The flushed water is discharged through the drain pipe. Therefore, the water purification system of the present application can not only flush the pre-filter element and the post-filter element, but also achieve active regeneration of the pre-filter element and the post-filter element, thereby extending the service life of the two, reducing their replacement frequency, and reducing costs. At the same time, it also increases the rated water purification capacity of the entire water purification system, with excellent economic benefits.

[0007] In an optional embodiment, the water purification system further includes a fine filter element, the fine filter element having a fine filter element water inlet, a pure water inlet and a waste water inlet, the fine filter element water inlet is connected to the pre-filter element water outlet through a first pipeline, a first water inlet valve is provided on the first pipeline, the pure water inlet is connected to the post-filter element water inlet, when the pipeline switching structure is in the first state, the first water inlet valve is opened, the pure water inlet is connected to the post-filter element water inlet, and when the pipeline switching structure is in the second state, the first water inlet valve is closed.

[0008] Beneficial effects: The fine filter element can purify the tap water from the pre-filter element with high precision in the water purification mode, and then input it into the post-filter element after purification to improve the purified water quality. In the thermal regeneration mode, the first water inlet valve can be closed to prevent hot water from entering the fine filter element and causing damage to the fine filter element.

[0009] In an optional embodiment, the water inlet of the post-filter is connected to the pure water inlet through a second pipeline, and the pipeline switching structure includes a first switch valve arranged on the regeneration pipeline and a second switch valve arranged on the second pipeline. When the pipeline switching structure is in the first state, the first switch valve is closed and the second switch valve is opened. When the pipeline switching structure is in the second state, the first switch valve is opened and the second switch valve is closed.

[0010] Beneficial effect: The pipeline switching structure is configured to include a first switch valve on the regeneration pipeline and a second switch valve arranged on the second pipeline, and the switching between the first state and the second state is achieved by controlling the on-off of the first switch valve and the second switch valve.

[0011] In an optional embodiment, the pipeline switching structure includes a reversing valve, which is connected to the pure water port, the regeneration water outlet and the post-filter element water inlet. When the pipeline switching structure is in the first state, the reversing valve connects the pure water port and the post-filter element water inlet. When the pipeline switching structure is in the second state, the reversing valve connects the regeneration water outlet and the post-filter element water inlet.

[0012] Beneficial effect: The pipeline switching structure is set in the form of a reversing valve, and the pure water inlet and the post-filter element water inlet or the regeneration water outlet and the post-filter element water inlet are connected by the reversing of the reversing valve, which is convenient to switch and has a simple structure.

[0013] In an optional embodiment, a second water inlet valve is provided on the water inlet pipeline, and the thermal regeneration mode further includes a soaking state. In the soaking state, the second water inlet valve and the drain valve are both closed.

[0014] Beneficial effect: The present application provides another method for active regeneration of the pre-filter element and the post-filter element, namely, the immersion state, using the tap water flowing in from the water inlet pipe, and the tap water is hot water to hot-immerse the pre-filter element and the post-filter element, thereby also realizing thermal regeneration of the pre-filter element and the post-filter element. Compared with the flushing state, the immersion state can regenerate the pre-filter element and the post-filter element for a long time, achieving a more lasting thermal regeneration effect.

[0015] In an optional embodiment, the water purification system further includes a liquid level detector provided on the pre-filter element and / or the post-filter element, and the liquid level detector is configured to control the opening and closing of the second water inlet valve by obtaining the liquid level of the pre-filter element and / or the post-filter element in the immersion state.

[0016] Beneficial effect: The liquid level of the pre-filter and / or post-filter during immersion is obtained through a liquid level detector, so that when the amount of hot water added reaches a preset liquid level, the second water inlet valve is closed to ensure that the hot water level during immersion meets the requirements and ensure the active regeneration effect of the pre-filter and post-filter.

[0017] In an optional embodiment, the water purification system also has a cooling mode. In the cooling mode, the pipeline switching structure is in the second state, the first water inlet valve is closed, and the drain valve is opened, and the pre-filter element and the post-filter element are flushed, and the flushing water is cold water.

[0018] Beneficial effect: tap water at room temperature flows through the water inlet pipe into the pre-filter element and flows through the regeneration pipe into the post-filter element, cooling the pre-filter element and the post-filter element at the same time. The cooled tap water is discharged through the discharge pipe, thereby realizing the use of tap water at room temperature to cool the pre-filter element and the post-filter element at the same time, avoiding the pre-filter element and the post-filter element from being overly hot and affecting normal water purification.

[0019] In an optional embodiment, the water purification system has a working state in which the heat regeneration mode and the cooling mode are operated alternately.

[0020] Beneficial effect: By alternately operating the pre-filter element in the hot regeneration mode and the cooling mode, the pre-filter element and the post-filter element are subjected to the cycle of hot regeneration-cooling-hot regeneration-cooling. This cycle can not only ensure the active regeneration effect of the pre-filter element and the post-filter element, but also avoid the pre-filter element and the post-filter element being damaged due to being in the high-temperature hot regeneration mode for a long time.

[0021] In an optional embodiment, the water purification system further includes a heating unit, which is arranged on the water inlet pipe and located upstream of the connection between the regeneration pipe and the water inlet pipe; or the heating unit is provided on the regeneration pipe and the water inlet pipe downstream of the connection between the regeneration pipe and the water inlet pipe; or the heating unit is provided on both the pre-filter element and the post-filter element.

[0022] Beneficial effects: The heating unit can heat the tap water in the pipeline or the tap water in the pre-filter element and the post-filter element. The heated water can be used to thermally regenerate the pre-filter element and the post-filter element. The position design of the heating unit includes external and internal. The external design can only have one heating unit or two heating units. During regeneration, the tap water is heated by the heating unit and then enters the pre-filter element and the post-filter element at the same time. The internal design is that the pre-filter element and the post-filter element are each equipped with a heating unit. The tap water will be heated only after entering the filter element, which has strong selectivity.

[0023] In an optional embodiment, the water purification system also includes a temperature detector and a controller, and the controller is communicatively connected to the temperature detector and the heating unit. The temperature detector is suitable for obtaining the temperature value of the tap water in the heat regeneration mode, so that the controller adjusts the heating power of the heating unit according to the temperature value.

[0024] Beneficial effect: The temperature of the tap water in the thermal regeneration mode is obtained through the temperature detector, and the water temperature is fed back to the controller in time. The controller can automatically adjust the heating power of the heating part according to the temperature value to ensure that the temperature of the tap water meets the thermal regeneration requirements and ensures the thermal regeneration effect.

[0025] In an optional embodiment, the water purification system also includes a coarse filter element, which has a coarse filter inlet and a coarse filter outlet. The coarse filter inlet is connected to the tap water inlet, and the coarse filter outlet is connected to the pre-filter element inlet through the water inlet pipe.

[0026] Beneficial effect: tap water flows into the coarse filter element through the tap water inlet, and the coarse filter element can filter out large particles of impurities in the tap water, so that the coarsely filtered tap water flows through the water inlet pipe to the water inlet of the pre-filter element, and is filtered again by the pre-filter element to reduce the filtering load on the subsequent pre-filter element.

[0027] In an optional embodiment, the drainage pipeline includes a first drainage branch, a second drainage branch and a main drainage pipeline, the first drainage branch is connected to the water outlet of the pre-filter element, the second drainage branch is connected to the water outlet of the post-filter element, the main drainage pipeline is connected to the first drainage branch and the second drainage branch, and the drain valve is arranged on the main drainage pipeline.

[0028] Beneficial effect: In the flushing state and cooling mode, the drain valve is opened, the water in the pre-filter element flows into the first drain branch through the pre-filter element outlet, the water in the post-filter element flows into the second drain branch through the post-filter element outlet, and the water in the first drain branch and the water in the second drain branch converge into the main drainage pipeline for discharge.

[0029] In an optional embodiment, the post-filter element is connected to the water intake port via a water intake pipe, and a water intake valve is provided on the water intake pipe, and the water intake valve is suitable for opening in the water purification mode; and / or, the wastewater port is connected to a wastewater pipe, and a wastewater solenoid valve is provided on the wastewater pipe.

[0030] Beneficial effects: The post-filter element receives the pure tap water filtered by the fine filter element, and can filter the pure tap water again to remove trace elements, adjust the pH and drinking taste. The filtered tap water flows to the water intake pipe, and the user can take the clean water by controlling the water intake valve. The wastewater pipe is used to discharge the wastewater generated when the fine filter element filters the tap water, and the wastewater solenoid valve is used to control the on and off of the wastewater pipe to achieve pressurized water purification for the fine filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the overall connection structure of a water purification system in one embodiment of the present invention is shown;

[0033] Figure 2 A schematic diagram showing the flow of tap water in a water purification system in a water purification mode according to an embodiment of the present invention is shown;

[0034] Figure 3 A schematic diagram showing the flow of tap water in a water purification system in a heat regeneration mode and a cooling mode according to an embodiment of the present invention is shown;

[0035] Figure 4 A schematic diagram of the overall connection structure of a water purification system in another embodiment of the present invention is shown;

[0036] Figure 5 A schematic diagram showing the flow of tap water in a water purification system in water purification mode in another embodiment of the present invention is shown;

[0037] Figure 6A schematic diagram of tap water flow in a water purification system in a heat regeneration mode and a cooling mode in another embodiment of the present invention is shown.

[0038] Description of reference numerals:

[0039] 1. Pre-filter element; 11. Pre-filter element water inlet; 12. Pre-filter element water outlet; 2. Fine filter element; 21. Fine filter element water inlet; 22. Wastewater outlet; 23. Pure water outlet; 3. Post-filter element; 31. Post-filter element water inlet; 32. Post-filter element water outlet; 4. Drain line; 41. First drainage branch; 42. Second drainage branch; 43. Main drainage line; 431. Drain valve; 5. Regeneration line; 6. Heating unit; 7. Coarse filter element; 71. Coarse filter water inlet; 72. Coarse filter outlet

[0040] 100, water inlet pipeline; 101, second water inlet valve; 200, first pipeline; 201, first water inlet valve; 300, second pipeline; 301, reversing valve; 400, wastewater pipeline; 401, wastewater solenoid valve; 500, tap water inlet pipeline; 501, booster pump; 600, water intake pipeline; 601, water intake valve. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0042] The following combination Figures 1 to 3 , describing embodiments of the present invention.

[0043] According to an embodiment of the present invention, Figure 1As shown, a water purification system is provided, including a pre-filter element 1, a post-filter element 3, a regeneration pipeline 5 and a pipeline switching structure, the pre-filter element 1 contains a carbon water purification unit, the pre-filter element 1 has a pre-filter element water inlet 11, a pre-filter element water outlet 12, the pre-filter element water inlet 11 is connected to a water inlet pipeline 100 connected to the tap water inlet, the post-filter element 3 contains a carbon water purification unit, the post-filter element 3 has a post-filter element water inlet 31, a post-filter element water outlet 32, the post-filter element water inlet 31 is connected to the pre-filter element water outlet 12, the post-filter element The filter element water outlet 32 is connected to the water inlet, and the rear filter element water outlet 32 and the front filter element water outlet 12 are also connected to the drain outlet through the drain pipe 4. The drain pipe 4 is provided with a drain valve 431. The regeneration pipe 5 has a regeneration water inlet and a regeneration water outlet. The regeneration water inlet is connected to the water inlet pipe 100, and the regeneration water outlet is connected to the rear filter element water inlet 31. The pipeline switching structure has a first state in which the front filter element water outlet 12 is connected to the rear filter element water inlet 31, and a second state in which the regeneration water outlet is connected to the rear filter element water inlet 31.

[0044] The water purification system of this embodiment has a water purification mode and a thermal regeneration mode. The water purification mode is the normal water purification route of the water purification system, while the regeneration mode is used to regenerate the active water purification system. Specifically, in the water purification mode, the pipeline switching structure is in the first state and the drain valve 431 is closed. Tap water flows through the water inlet pipeline 100 in sequence through the pre-filter element 1 and the post-filter element 3 to purify the tap water. The thermal regeneration mode includes a flushing mode. In the flushing mode, the pipeline switching structure is in the second state and the drain valve 431 is opened. Hot water flows through the water inlet pipeline 100 in sequence into the pre-filter element 1 and then into the post-filter element 3 through the regeneration pipeline 5, thereby simultaneously thermally flushing the pre-filter element 1 and the post-filter element 3. The hot water not only has a flushing effect, but also breaks the equilibrium between the activated carbon and the pollutant adsorbate, causing the pollutants to desorb, thereby restoring some of the adsorption capacity of the activated carbon components and regenerating the pre-filter element 1 and the post-filter element 3. The flushing water is discharged through the drain pipeline 4. Therefore, the water purification system of the present application can not only flush the pre-filter element 1 and the post-filter element 3, but also realize the active regeneration of the pre-filter element 1 and the post-filter element 3, thereby extending the service life of the pre-filter element 1 and the post-filter element 3, reducing their replacement frequency, and reducing costs, while also increasing the rated water purification capacity of the entire water purification system, with excellent economic benefits.

[0045] In this embodiment, the water purification system also includes a fine filter element 2, which has a fine filter element water inlet 21, a pure water inlet 23 and a waste water outlet 22. The fine filter element water inlet 21 is connected to the pre-filter element water outlet 12 through a first pipeline 200. A first water inlet valve 201 is provided on the first pipeline 200, and the pure water inlet 23 is connected to the post-filter element water inlet 31. When the pipeline switching structure is in the first state, the first water inlet valve 201 is opened, and the pure water inlet 23 is connected to the post-filter element water inlet 31. When the pipeline switching structure is in the second state, the first water inlet valve 201 is closed.

[0046] With the above arrangement, the fine filter element 2 can purify the tap water from the pre-filter element 1 with high precision in the water purification mode, and then input the purified water into the post-filter element 3 to improve the purified water quality. In the heat regeneration mode, the first water inlet valve 201 can be closed to prevent hot water from entering the fine filter element 2 and causing damage to the fine filter element 2.

[0047] In this embodiment, the pre-filter element 1 is an activated carbon filter element comprising multiple carbon water purification units, which can effectively remove oxidizing substances such as residual chlorine that may damage the fine filter element 2 and protect the fine filter element 2. However, during long-term operation, the surface of the activated carbon filter element may breed bacteria and form biofilms, resulting in a decrease in water purification performance and may even directly contaminate the purified water. In the thermal regeneration mode, hot water can be used to rinse and disinfect the activated carbon filter element to achieve active regeneration, thereby extending the service life of the activated carbon filter element, reducing the frequency of replacement, and achieving the purpose of saving economic costs.

[0048] Of course, in some embodiments, the pre-filter element 1 can also be set as a composite filter element composed of a first-level PP cotton, ultrafiltration and activated carbon in series. The composite filter element can not only filter colloids, heavy metals and sediment particles, but also remove oxidizing substances such as residual chlorine.

[0049] In this embodiment, the water inlet pipe 100 is connected to the tap water inlet end to facilitate the long-distance delivery of tap water to the water purification system. A second water inlet valve 101 is provided on the water inlet pipe 100. The second water inlet valve 101 is used to control the on / off of the water inlet pipe 100. When the second water inlet valve 101 is open, the water inlet pipe 100 is open, and tap water can flow into the pre-filter 1 through the water inlet pipe 100. When the second water inlet valve 101 is closed, the water inlet pipe 100 is disconnected, and tap water cannot flow through the water inlet pipe 100 into the pre-filter 1.

[0050] Compared to the pre-filter element 1 and post-filter element 3, the fine filter element 2 has a higher filtration accuracy and can further purify tap water with high precision. It is the core treatment filter element of the water purification system. The fine filter element 2 can be a reverse osmosis membrane filter element, an RO membrane filter element, etc., and the specific selection depends on the filtration requirements. This embodiment does not specifically limit it.

[0051] In this embodiment, the fine filter element water inlet 21 is connected to the pre-filter element water outlet 12 through the first pipe 200, so that the tap water filtered by the pre-filter element 1 flows through the fine filter element water inlet 21 through the first pipe 200 and then enters the fine filter element 2 to achieve higher precision filtration. The first water inlet valve 201 can control the on and off of the first pipe 200. When the first water inlet valve 201 is opened, the first pipe 200 is turned on, so that the pre-filter element water outlet 12 and the fine filter element water inlet 21 are connected, and tap water can flow from the pre-filter element 1 to the fine filter element 2; when the first water inlet valve 201 is closed, the first pipe 200 is blocked, so that the pre-filter element water outlet 12 and the fine filter element water inlet 21 are disconnected, and hot water cannot flow into the fine filter element 2 through the pre-filter element 1, thereby protecting the fine filter element 2.

[0052] The waste water outlet 22 is convenient for discharging waste water generated when the fine filter element 2 filters tap water, and the pure water outlet 23 is convenient for the pure tap water filtered by the fine filter element 2 to flow out of the fine filter element 2.

[0053] The drainage pipe 4 is connected to the water outlet 12 of the pre-filter element and the water outlet 32 of the post-filter element. In the hot regeneration mode, the remaining tap water in the pre-filter element 1 and the post-filter element 3 can be discharged to facilitate the entry of hot water into the pre-filter element 1 and the post-filter element 3, as well as to discharge the hot water after flushing to achieve continuous flushing of the pre-filter element 1 and the post-filter element 3.

[0054] The regeneration pipeline 5 is connected to both the water inlet pipeline 100 and the water inlet 31 of the post-filter element, and can simultaneously transport the hot water in the water inlet pipeline 100 to the post-filter element 3 in the thermal regeneration mode to achieve simultaneous thermal regeneration of the pre-filter element 1 and the post-filter element 3.

[0055] The pipeline switching structure can connect the water outlet 12 of the pre-filter element with the water inlet 31 of the post-filter element. Specifically, the water outlet 12 of the pre-filter element is connected through the fine filter element 2 and the water inlet 31 of the post-filter element, so that in the water purification mode, the tap water of the pre-filter element 1 flows through the fine filter element 2 and then flows into the post-filter element 3. It can also connect the regeneration water outlet with the water inlet 31 of the post-filter element, so that the hot water in the regeneration pipeline 5 flows into the post-filter element 3.

[0056] In this embodiment, the water inlet 31 of the post-filter element is connected to the pure water inlet 23 through the second pipeline 300, so that the pure tap water filtered by the fine filter element 2 flows into the second pipeline 300 through the pure water inlet 23, and then flows through the water inlet 31 of the post-filter element into the post-filter element 3.

[0057] In this embodiment, the pipeline switching structure includes a reversing valve 301, which is connected to the pure water port 23, the regeneration water outlet, and the post-filter cartridge water inlet 31. When the pipeline switching structure is in a first state, the reversing valve 301 connects the pure water port 23 and the post-filter cartridge water inlet 31. When the pipeline switching structure is in a second state, the reversing valve 301 connects the regeneration water outlet and the post-filter cartridge water inlet 31. The pipeline switching structure is provided in the form of a reversing valve 301, and the reversing of the reversing valve 301 connects the pure water port 23 and the post-filter cartridge water inlet 31 or the regeneration water outlet and the post-filter cartridge water inlet 31, which facilitates switching and has a simple structural setting.

[0058] Specifically, the reversing valve 301 may be a two-way valve.

[0059] Of course, in some embodiments, the pipeline switching structure includes a first switch valve arranged on the regeneration pipeline 5 and a second switch valve arranged on the second pipeline 300. When the pipeline switching structure is in the first state, the first switch valve is closed and the second switch valve is opened. When the pipeline switching structure is in the second state, the first switch valve is opened and the second switch valve is closed, which can also achieve the same technical effect as the reversing valve 301 of this embodiment.

[0060] It is understandable that the flushing time of the flushing state can be set according to the condition of the pre-filter 1. For example, the timed flushing can be set to 15 minutes, 20 minutes or other durations.

[0061] In this embodiment, the thermal regeneration mode also includes a soaking state. In the soaking state, the second water inlet valve 101 and the drain valve 431 are both closed. The present application provides another way to actively regenerate the pre-filter element 1 and the post-filter element 3, namely the soaking state, using the tap water flowing into the water inlet pipe 100, and the tap water is hot water to thermally soak the pre-filter element 1 and the post-filter element 3, thereby also achieving thermal regeneration of the pre-filter element 1 and the post-filter element 3. Compared with the flushing state, the soaking state can regenerate the pre-filter element 1 and the post-filter element 3 for a long time, achieving a more lasting thermal regeneration effect.

[0062] It should be noted here that when the soaking state reaches a certain length of time, the discharge valve needs to be opened to discharge the hot water after soaking through the discharge pipe.

[0063] Optionally, the duration of the soaking state can be set as needed, for example, setting the soaking time to 30 minutes, 1 hour, or other durations, which is not specifically limited in this embodiment.

[0064] The water purification system of this embodiment also has a cooling mode. In cooling mode, the pipeline switching structure is in the second state, the first water inlet valve 201 is closed, and the drain valve 431 is opened, so that the pre-filter element 1 and the post-filter element 3 are flushed with cold water. In this setting, tap water at room temperature flows through the water inlet pipe 100 into the pre-filter element 1 and flows through the regeneration pipe 5 into the post-filter element 3, while cooling the pre-filter element 1 and the post-filter element 3. The cooled tap water is discharged through the discharge pipe, thereby achieving the simultaneous cooling of the pre-filter element 1 and the post-filter element 3 using tap water at room temperature, preventing the pre-filter element 1 and the post-filter element 3 from being overheated and affecting normal water purification.

[0065] It is understandable that the cooling mode is generally turned on after the thermal regeneration mode is running, in order to cool the pre-filter element 1 and the post-filter element 3 that generate high temperature in the thermal regeneration mode. Only after cooling can the water purification system enter the water purification mode.

[0066] In this embodiment, the water purification system has an operating state in which thermal regeneration mode and cooling mode are alternately operated. By alternating the thermal regeneration mode and cooling mode for the pre-filter element 1, a cycle of thermal regeneration-cooling-thermal regeneration-cooling is achieved for the pre-filter element 1 and the post-filter element 3. This cycle ensures the active regeneration of the pre-filter element 1 and the post-filter element 3 while preventing damage to the pre-filter element 1 and the post-filter element 3 caused by prolonged exposure to high temperatures in the thermal regeneration mode.

[0067] For the water purification system of this embodiment, users can choose any one of them according to the amount of clean water or the degree of contamination of the pre-filter element 1 and the post-filter element 3. For example, if the pre-filter element 1 and the post-filter element 3 are lightly contaminated or the amount of clean water is small, the pre-filter element 1 and the post-filter element 3 can be disinfected for a short time, that is, the flushing state of the thermal regeneration mode can be adopted to achieve flow regeneration. If the pre-filter element 1 and the post-filter element 3 are heavily contaminated or the amount of clean water is large, the pre-filter element 1 and the post-filter element 3 can be regenerated for a long time, that is, the immersion state of the thermal regeneration mode or alternating hot and cold water flushing regeneration can be adopted. Therefore, users can choose the form of thermal regeneration according to actual needs.

[0068] In this embodiment, Figures 1 to 3 As shown, the water purification system further includes a heating unit 6, which is disposed on the water inlet pipe 100 and is located upstream of the connection between the regeneration pipe 5 and the water inlet pipe 100. In this arrangement, tap water flows through the water inlet pipe 100 and enters the heating unit 6, which heats the tap water into hot water. The hot water is then diverted from the connection between the regeneration pipe 5 and the water inlet pipe 100, with one portion flowing into the pre-filter element 1 and the other portion flowing through the regeneration pipe 5 to the post-filter element 3, thereby simultaneously thermally regenerating the pre-filter element 1 and the post-filter element 3. The heating unit is provided independently of the pre-filter element 1 and the post-filter element 3, and only one needs to be provided, which does not affect the replacement of the filter elements and reduces the installation cost.

[0069] Of course, in some embodiments, such as Figures 3 to 6 As shown, a heating unit 6 can be provided on both the pre-filter element 1 and the post-filter element 3. When tap water flows into the pre-filter element 1 and the post-filter element 3, the heating unit 6 is used to heat the tap water in the pre-filter element 1 and the post-filter element 3 respectively. The heated hot water then regenerates the pre-filter element 1 and the post-filter element 3. The heating unit 6 is built into the pre-filter element 1 and the post-filter element 3 to achieve separate heating of the two filter elements. It is understandable that under this solution, the heating unit 6 can be integrated with the membrane shell of the pre-filter element 1 and the post-filter element 3. The entire core can be discarded, or the membrane shell and the inner core can be separated, so that only the inner core needs to be replaced when replacing the filter element.

[0070] In addition, in other embodiments, a heating unit 6 can be provided on the regeneration pipeline 5 and the water inlet pipeline 100 downstream of the connection between the regeneration pipeline 5 and the water inlet pipeline 100. The tap water is heated by the heating unit 6 on the regeneration pipeline 5 and then flows to the post-filter element 3. The tap water is heated by the heating unit 6 on the water inlet pipeline 100 downstream of the connection between the regeneration pipeline 5 and the water inlet pipeline 100 and then flows to the pre-filter element 1, thereby also achieving the heating of the tap water.

[0071] From the above, it can be seen that the position design of the heating part 6 in this application includes external and internal. The external design can only set one heating part or two heating parts. During regeneration, the tap water is heated by the heating part and then enters the pre-filter element 1 and the post-filter element 3 at the same time. The built-in design is that the pre-filter element 1 and the post-filter element 3 each have a heating part, and the tap water will be heated only after entering the filter element.

[0072] For example, the heating part 6 may be a stainless steel heating tube, an electric heating wire, or the like.

[0073] In this embodiment, the water purification system further includes a temperature detector and a controller. The controller is in communication with both the temperature detector and the heating unit 6. The temperature detector is adapted to obtain the temperature of the tap water in thermal regeneration mode, allowing the controller to adjust the heating power of the heating unit 6 accordingly. The temperature detector obtains the temperature of the tap water in thermal regeneration mode and promptly feeds the water temperature back to the controller. The controller can then automatically adjust the heating power of the heating unit 6 based on the temperature value to ensure that the tap water temperature meets the thermal regeneration requirements and thereby guarantee the thermal regeneration effect.

[0074] Specifically, when the temperature detector detects that the temperature of the tap water in the heat regeneration mode is too low, the controller increases the heating power of the heating unit 6 to quickly heat the tap water. When the temperature detector detects that the temperature of the tap water in the heat regeneration mode is too high, the controller reduces the heating power of the heating unit 6. The tap water temperature will be lowered and the loss of the heating unit 6 will also be reduced.

[0075] In terms of the specific setting position, the temperature detector is related to the setting position of the heating part 6. When the heating part 6 is set on the water inlet pipe 100, the temperature detector can be set on the water inlet pipe 100 and located downstream of the heating part 6. The heating part 6 can also be set on the pre-filter element 1 and the post-filter element 3; when the heating part 6 is set on the water inlet pipe 100 of the pre-filter element 1 and the post-filter element 3, the temperature detector also needs to be set on the pre-filter element 1 and the post-filter element 3.

[0076] As an optional implementation of the water purification system of this embodiment, it also includes a liquid level detector provided on the pre-filter element 1 and / or the post-filter element 3. The liquid level detector is configured to control the opening and closing of the second water inlet valve 101 by obtaining the liquid level of the pre-filter element 1 and / or the post-filter element 3 during the immersion state. This configuration uses the liquid level detector to obtain the liquid level of the pre-filter element 1 and / or the post-filter element 3 during the immersion state, so that when the amount of hot water added reaches a preset liquid level, the second water inlet valve 101 is closed, thereby ensuring that the hot water liquid level during immersion meets the requirements and ensuring the active regeneration effect of the pre-filter element 1 and the post-filter element 3.

[0077] Furthermore, the controller can also be communicatively connected with the liquid level detector and the second water inlet valve 101. The liquid level detector can promptly feed back the liquid level in the pre-filter element 1 and / or the post-filter element 3 during the immersion state to the controller. When the liquid level reaches the preset liquid level, the controller controls the second water inlet valve 101 to close, so as to achieve the immersion of the pre-filter element 1 and the post-filter element 3.

[0078] It is understandable that the preset liquid level can be set as needed, and this embodiment does not impose any specific limitation.

[0079] Optionally, a liquid level detector and a temperature detector can be set simultaneously in the pre-filter element 1 and the post-filter element 3, or a liquid level detector can be set on one of the pre-filter element 1 and the post-filter element 3, and a temperature detector can be set on the other. Alternatively, a liquid level detector can be set on at least one of the pre-filter element 1 and the post-filter element 3, and the temperature detector can be set on the water inlet pipe 100 or the regeneration pipe 5.

[0080] In this embodiment, the drainage pipeline 4 includes a first drainage branch pipe 41, a second drainage branch pipe 42, and a main drainage pipe 43. The first drainage branch pipe 41 is connected to the pre-filter outlet 12, the second drainage branch pipe 42 is connected to the post-filter outlet 32, the main drainage pipe 43 is in communication with both the first drainage branch pipe 41 and the second drainage branch pipe 42, and a drainage valve 431 is provided on the main drainage pipe 43. In the flushing state and cooling mode, the drainage valve 431 is opened, and the water from the pre-filter 1 flows into the first drainage branch pipe 41 through the pre-filter outlet 12, and the water from the post-filter 3 flows into the second drainage branch pipe 42 through the post-filter outlet 32. The water from the first drainage branch pipe 41 and the water from the second drainage branch pipe 42 are then combined and discharged into the main drainage pipe 43.

[0081] In some embodiments, the pre-filter element 1 and the post-filter element 3 can also drain water through two independent pipelines respectively. Drain valves 431 are respectively set on the two independent pipelines to control the on and off of the pipelines, which can also play the same role as in this embodiment.

[0082] In this embodiment, the wastewater outlet 22 is connected to a wastewater pipeline 400, which is provided with a wastewater solenoid valve 401. The wastewater pipeline 400 is used to discharge wastewater generated when the fine filter element 2 filters tap water. The wastewater solenoid valve 401 is used to control the on-off of the wastewater pipeline 400 to achieve pressurized water purification for the fine filter element 2.

[0083] The post-filter element 3 is connected to the water inlet via a water inlet pipe 600. This pipe is equipped with a water inlet valve 601, which is suitable for opening in water purification mode. The post-filter element 3 receives the tap water filtered by the fine filter element 2 and further filters it to remove trace elements, adjust the pH, and enhance the taste. The filtered tap water then flows into the water inlet pipe 600, and the user can access the purified water by controlling the water inlet valve 601.

[0084] Specifically, the post-filter element 3 may also be an activated carbon filter element or a composite filter element containing a carbon water purification unit.

[0085] In this embodiment, in order to reduce pipeline settings and improve system compactness, the first pipeline 200 is connected to the first drainage branch pipe 41 and the water intake pipeline 600 is connected to the second drainage branch pipe 42.

[0086] As an optional embodiment of the water purification system of this embodiment, a coarse filter cartridge 7 is further included. The coarse filter cartridge 7 has a coarse filter water inlet 71 and a coarse filter outlet. The coarse filter water inlet 71 is connected to the tap water inlet, and the coarse filter water outlet 72 is connected to the pre-filter cartridge water inlet 11 via the water inlet pipe 100. Tap water flows into the coarse filter cartridge 7 through the tap water inlet. The coarse filter cartridge 7 can filter out large particles of impurities in the tap water. The coarsely filtered tap water flows through the water inlet pipe 100 to the pre-filter cartridge water inlet 11 and is filtered again by the pre-filter cartridge 1.

[0087] Optionally, the coarse filter element 7 may be PP cotton or a dense filter mesh to intercept large particles of impurities in the tap water and reduce the filtering load on the subsequently arranged pre-filter element 1.

[0088] It should be noted here that, in some embodiments, the coarse filter element 7 may not be provided, and the pre-filter element 1 may be set as a carbon composite filter element composed of a first-level PP cotton, ultrafiltration and activated carbon in series to achieve the dual functions of coarse filtration and carbon adsorption.

[0089] Furthermore, the water inlet of the coarse filter element 7 is connected to the tap water inlet through the tap water inlet pipe 500, and the tap water inlet pipe 500 is provided with a booster pump 501 to provide power for the flow of tap water in the entire water purification system.

[0090] To facilitate understanding of the water purification system of this embodiment, the following description of the use of the water purification system is given based on a solution in which only one heating unit 6 is provided on the water inlet pipe 100:

[0091] In water purification mode, Figure 2 As shown, Figure 2 The direction indicated by the medium thick line segment and the arrow is the flow direction of tap water in the water purification mode. The first water inlet valve 201, the second water inlet valve 101, the waste water solenoid valve 401 and the booster pump 501 are all open, the reversing valve 301 connects the pure water port 23 and the post-filter inlet 31, the drain valve 431 and the heating part 6 are both closed, and the tap water flows through the tap water inlet through the booster pump 501 into the coarse filter element 7, and after coarse filtration by the coarse filter element 7, it flows into the water inlet pipe 100, and flows through the second water inlet valve 101 and the heating part 6 (closed state) in turn, and flows into the pre-filter element 1, the pre-filter element 1 performs secondary purification on the coarsely filtered tap water, and the purified tap water flows through the pre-filter outlet 12, passes through the first water inlet valve 201 on the first pipeline 200, and then enters the fine filter element 2. The fine filter element 2 performs high-precision filtration on the tap water after the secondary filtration, and the waste water generated by the filtration is discharged into the wastewater pipeline 400 through the wastewater outlet 22. The filtered pure tap water flows through the pure water outlet 23, passes through the second pipeline 300, and then enters the post-filter element 3. The post-filter element 3 filters the pure tap water again and adjusts the pH value. The purified water obtained flows to the water intake pipeline 600;

[0092] Flushing status in thermal regeneration mode, such as Figure 3 As shown, Figure 3 The direction indicated by the medium thick line segment and the arrow is the flow direction of hot water in the flushing state. The first water inlet valve 201 is closed, the booster pump 501, the second water inlet valve 101, the heating unit 6 and the drain valve 431 are all opened, and the reversing valve 301 connects the regeneration water outlet and the post-filter inlet 31. Tap water flows through the tap water inlet through the booster pump 501 into the coarse filter element 7, flows into the water inlet pipe 100 through the coarse filter element 7, and flows through the second water inlet valve 101 and the heating unit 6 in sequence. A part of the hot water heated by the heating unit 6 flows into the pre-filter element 1, and the other part flows through the regeneration pipe 5 and the reversing valve 301 into the post-filter element 3, so as to simultaneously perform hot flushing on the pre-filter element 1 and the post-filter element 3. The hot water after flushing is discharged through the discharge pipe, thereby realizing active regeneration of the pre-filter element 1 and the post-filter element 3.

[0093] In the soaking state in the thermal regeneration mode, the first water inlet valve 201 and the drain valve 431 are both closed, the booster pump 501, the second water inlet valve 101 and the heating part 6 are all opened, and the reversing valve 301 connects the regeneration water outlet and the post-filter element water inlet 31. The tap water flows through the coarse filter element 7 into the water inlet pipe 100, and flows through the second water inlet valve 101 and the heating part 6 in sequence. A part of the hot water heated by the heating part 6 flows into the pre-filter element 1, and the other part flows through the regeneration pipe 5 and the reversing valve 301 into the post-filter element 3. When the liquid level detector detects that the liquid level of the pre-filter element 1 and the post-filter element 3 reaches the preset liquid level, the booster pump 501 and the second water inlet valve 101 are closed, and the pre-filter element 1 and the post-filter element 3 are simultaneously soaked with the added hot water. After soaking for a certain period of time, the drain valve 431 is opened to discharge the soaked hot water through the discharge pipe.

[0094] In cooling mode, Figure 3 As shown, Figure 3 The direction indicated by the medium thick line segment and the arrow is the flow direction of tap water in the cooling mode. The first water inlet valve 201 and the heating part 6 are all closed, the booster pump 501, the second water inlet valve 101 and the drain valve 431 are all opened, the reversing valve 301 connects the regeneration water outlet and the post-filter element water inlet 31, and the tap water flows through the booster pump 501 through the tap water inlet into the coarse filter element 7, flows into the water inlet pipe 100 through the coarse filter element 7, and flows through the second water inlet valve 101 and the heating part 6 (closed state) in turn. Part of the tap water flows into the pre-filter element 1, and the other part of the tap water flows through the regeneration pipe 5 and the reversing valve 301 into the post-filter element 3 to cool the pre-filter element 1 and the post-filter element 3 at the same time. The cooled tap water is discharged through the discharge pipe to cool the pre-filter element 1 and the post-filter element 3 to room temperature.

[0095] It should be noted that the timing of starting the thermal regeneration mode is related to the water purification volume of the water purification mode and the downtime of the water purification system. The starting time of the cooling mode is after the thermal regeneration mode is running. The thermal regeneration mode and the cooling mode can be selected to run alternately, and the immersion state and flushing state in the thermal regeneration mode can be selected to run according to actual needs.

[0096] It is easy to understand that in some embodiments, Figure 4 As shown, when the heating unit 6 is arranged on the pre-filter element 1 and the post-filter element 3, the flow direction of the tap water in the water purification mode is as follows: Figure 5 The direction indicated by the thick line and arrow is as follows: Figure 6As shown in the direction indicated by the thick line segment and the arrow, it can be seen that the flow direction of tap water and the control of each pipeline control valve during use are the same as those in the scheme of this embodiment. The only difference is that one is to heat the tap water in the pipeline before inputting it into the pre-filter element 1 and the post-filter element 3, while the other is to heat the tap water after it enters the pre-filter element 1 and the post-filter element 3. Therefore, this embodiment will not be repeated.

[0097] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A water purification system, characterized in that: include: A pre-filter element (1) includes a carbon water purification unit, the pre-filter element (1) having a pre-filter element water inlet (11) and a pre-filter element water outlet (12), the pre-filter element water inlet (11) being connected to a water inlet pipeline (100) communicating with a tap water inlet; A post-filter element (3) contains a carbon water purification unit, the post-filter element (3) having a post-filter element water inlet (31) and a post-filter element water outlet (32), the post-filter element water inlet (31) being connected to the pre-filter element water outlet (12), the post-filter element water outlet (32) being connected to a water intake, the post-filter element water outlet (32) and the pre-filter element water outlet (12) being further connected to a drain outlet via a drain pipe (4), the drain pipe (4) being provided with a drain valve (431); A regeneration pipeline (5) having a regeneration water inlet and a regeneration water outlet, wherein the regeneration water inlet is connected to the water inlet pipeline (100), and the regeneration water outlet is connected to the post-filter element water inlet (31); The pipeline switching structure has a first state in which the pre-filter element water outlet (12) is connected to the post-filter element water inlet (31), and a second state in which the regeneration water outlet is connected to the post-filter element water inlet (31); The water purification system has a water purification mode and a heat regeneration mode; In the water purification mode, the pipeline switching structure is in the first state and the drain valve (431) is closed; The thermal regeneration mode includes a flushing state, in which the pipeline switching structure is in the second state, the drain valve (431) is opened, and the pre-filter element (1) and the post-filter element (3) are flushed, and the flushing water is hot water; The water purification system further comprises a fine filter element (2), the fine filter element (2) having a fine filter element water inlet (21), a pure water outlet (23) and a waste water outlet (22), the fine filter element water inlet (21) being connected to the pre-filter element water outlet (12) via a first pipeline (200), a first water inlet valve (201) being provided on the first pipeline (200), the pure water outlet (23) being connected to the post-filter element water inlet (31), when the pipeline switching structure is in the first state, the first water inlet valve (201) is opened, and the pure water outlet (23) is connected to the post-filter element water inlet (31), and when the pipeline switching structure is in the second state, the first water inlet valve (201) is closed; The pipeline switching structure comprises a reversing valve (301), the reversing valve (301) being connected to the pure water port (23), the regeneration water outlet and the post-filter element water inlet (31); when the pipeline switching structure is in the first state, the reversing valve (301) connects the pure water port (23) and the post-filter element water inlet (31); and when the pipeline switching structure is in the second state, the reversing valve (301) connects the regeneration water outlet and the post-filter element water inlet (31).

2. The water purification system according to claim 1, characterized in that: The post-filter water inlet (31) is connected to the pure water port (23) via a second pipeline (300); the pipeline switching structure comprises a first switch valve provided on the regeneration pipeline (5) and a second switch valve provided on the second pipeline (300); when the pipeline switching structure is in the first state, the first switch valve is closed and the second switch valve is opened; when the pipeline switching structure is in the second state, the first switch valve is opened and the second switch valve is closed.

3. The water purification system according to claim 1 or 2, characterized in that: The water inlet pipe (100) is provided with a second water inlet valve (101), and the thermal regeneration mode further includes a soaking state. In the soaking state, the second water inlet valve (101) and the drain valve (431) are both closed.

4. The water purification system according to claim 3, characterized in that: The water purification system further comprises a liquid level detector provided on the pre-filter element (1) and / or the post-filter element (3), wherein the liquid level detector is configured to control the opening and closing of the second water inlet valve (101) by obtaining the liquid level of the pre-filter element (1) and / or the post-filter element (3) in the immersion state.

5. The water purification system according to claim 1 or 2, characterized in that: The water purification system also has a cooling mode. In the cooling mode, the pipeline switching structure is in the second state, the first water inlet valve (201) is closed, and the drain valve (431) is opened, so that the pre-filter element (1) and the post-filter element (3) are flushed, and the flushing water is cold water.

6. The water purification system according to claim 5, characterized in that: The water purification system has an operating state in which the heat regeneration mode and the cooling mode are alternately operated.

7. The water purification system according to claim 1 or 2, characterized in that: The invention also includes a heating unit (6), which is provided on the water inlet pipe (100) and is located upstream of the connection between the regeneration pipe (5) and the water inlet pipe (100); or the heating unit (6) is provided on both the regeneration pipe (5) and the water inlet pipe (100) downstream of the connection between the regeneration pipe (5) and the water inlet pipe (100); or the heating unit (6) is provided on both the pre-filter element (1) and the post-filter element (3).

8. The water purification system according to claim 7, characterized in that: It also includes a temperature detector and a controller, wherein the controller is in communication with the temperature detector and the heating unit (6), and the temperature detector is suitable for obtaining the temperature value of the tap water in the heat regeneration mode, so that the controller adjusts the heating power of the heating unit (6) according to the temperature value.

9. The water purification system according to claim 1 or 2, characterized in that: The invention also comprises a coarse filter element (7), wherein the coarse filter element (7) has a coarse filter water inlet (71) and a coarse filter water outlet (72), wherein the coarse filter water inlet (71) is connected to the tap water inlet, and the coarse filter water outlet (72) is connected to the pre-filter element water inlet (11) via the water inlet pipeline (100).

10. The water purification system according to claim 1 or 2, characterized in that: The drainage pipeline (4) comprises: A first drainage branch pipe (41) connected to the water outlet (12) of the pre-filter element; A second drainage branch pipe (42) connected to the water outlet of the post-filter element (32); The main drainage pipeline (43) is in communication with both the first drainage branch pipe (41) and the second drainage branch pipe (42), and the drainage valve (431) is arranged on the main drainage pipeline (43).

11. The water purification system according to claim 1 or 2, characterized in that: The post-filter element (3) is connected to the water intake port via a water intake pipe (600), the water intake pipe (600) is provided with a water intake valve (601), and the water intake valve (601) is suitable for opening in the water purification mode; and / or the wastewater port (22) is connected to a wastewater pipe (400), and the wastewater pipe (400) is provided with a wastewater solenoid valve (401).

Images