Water purification system and control method

Abstract

The present invention relates to the technical field of water purification, and discloses a water purification system and a control method, including a water production device, a heating device, a backwashing pipeline, and a control valve group. The water production device includes a water production pipeline and a front and rear filter element connected in series to the water production pipeline and each including a carbon water purification unit. The front filter element has a front filter element water inlet and a front filter element water outlet, the rear filter element has a rear filter element water inlet and a rear filter element water outlet, the heating device has a heating water inlet and a heating water outlet, the backwashing pipeline includes a first regeneration pipeline connected in parallel to the heating water outlet and the rear filter element water outlet, a second regeneration pipeline connected in parallel to the heating water outlet and the front filter element water outlet, and a drainage pipeline connected to the rear filter element water inlet and the front filter element water inlet. The control valve group is arranged on the water production pipeline and the backwashing pipeline. The present invention can reversely hot-wash the front filter element and / or the rear filter element to remove impurities and unclog the filter element, thereby extending the service life, reducing the replacement frequency, and increasing the rated water purification capacity of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification, and in particular to a water purification system and a control method. 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 precision filter element, and a post-treatment filter element. The pre-treatment filter element is used to remove organic matter, colloids, heavy metals, and silt particles. The precision 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 and a control method to solve the problem in the prior art that pre-treatment filter elements and post-treatment filter elements need to be frequently replaced and are costly.

[0005] The first aspect of the present invention provides a water purification system, including a water production device, a heating device, a backwash pipe and a control valve group, the water production device includes a water production pipeline and a pre-filter and a post-filter connected in series to the water production pipeline in sequence, the pre-filter and the post-filter both include a carbon water purification unit, the pre-filter has a pre-filter water inlet and a pre-filter water outlet, the post-filter has a post-filter water inlet and a post-filter water outlet, the heating device has a heating water inlet and a heating water outlet, the heating water outlet is connected to the water intake end, the backwash pipeline includes a first regeneration pipeline connected in parallel between the heating water outlet and the post-filter water outlet, and a first regeneration pipeline connected in parallel to The second regeneration pipeline between the heating water outlet and the pre-filter water outlet, and the drainage pipeline respectively connected to the post-filter water inlet and the pre-filter water inlet, the control valve group is arranged on the water production pipeline and the backwash pipeline, suitable for controlling the water purification system to perform the thermal regeneration mode, and controlling the hot water to flow through the heating water outlet, the first regeneration pipeline, the post-filter water outlet, the post-filter, the post-filter water inlet and the drainage pipeline in sequence, and / or flow through the heating water outlet, the second regeneration pipeline, the pre-filter water outlet, the pre-filter, the pre-filter water inlet and the drainage pipeline in sequence.

[0006] Beneficial effects: Tap water flows into the pre-filter and the post-filter in sequence through the water production pipeline to achieve tap water purification. By connecting a first regeneration pipeline in parallel between the heating water outlet and the post-filter outlet, and a second regeneration pipeline in parallel between the heating water outlet and the pre-filter outlet, and providing a drainage pipeline connected to the post-filter inlet and the pre-filter inlet respectively, the water purification system can execute a thermal regeneration mode according to the usage of the pre-filter and the post-filter. When the control valve group controls the water purification system to execute the thermal regeneration mode, the hot water in the heating device can be reversely input into the pre-filter and / or the post-filter to perform reverse hot flushing and regeneration. The 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 desorbed, thereby restoring part of the adsorption capacity of the carbon water purification unit and achieving regeneration of the pre-filter and / or the post-filter, thereby extending the service life of the pre-filter and the post-filter, 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 control valve group also includes a first pipeline switching structure, which has a first state in which the water inlet of the pre-filter is connected to the tap water inlet, and a second state in which the water inlet of the pre-filter is connected to the drainage pipeline. When the water purification system executes the water production mode, the first pipeline switching structure is in the first state, and when the water purification system executes the thermal regeneration mode, the first pipeline switching structure is in the second state.

[0008] Beneficial effect: When the water purification system executes the water production mode, the first pipeline switching structure is in the first state, and the tap water flows through the tap water inlet, the water production pipeline, and the pre-filter inlet in sequence to enter the pre-filter for purification. When the water purification system executes the thermal regeneration mode, the first pipeline switching structure is in the second state, and the hot water after flushing the pre-filter can flow into the drainage pipeline from the pre-filter inlet to be discharged. Therefore, the first pipeline switching structure plays a role in switching the connectivity state of the pre-filter inlet to realize switching between the water production mode and the thermal regeneration mode.

[0009] In an optional embodiment, the control valve group also includes a fourth pipeline switching structure, which has a first state in which the water outlet of the post-filter element is connected to the heating water inlet, and a second state in which the water outlet of the post-filter element is connected to the first regeneration pipeline. When the water purification system executes the water production mode, the fourth pipeline switching structure is in the first state, and when the water purification system executes the thermal regeneration mode, the fourth pipeline switching structure is in the second state.

[0010] Beneficial effect: When the water purification system executes the water production mode, the fourth pipeline switching structure is in the first state, so as to connect the water outlet of the post-filter element with the heating water inlet, so that the purified tap water flows through the fourth pipeline switching structure and the heating water inlet into the heating device; when the water purification system executes the hot regeneration mode, the fourth pipeline switching structure is in the second state, so as to connect the water outlet of the post-filter element with the first regeneration pipeline, so that the hot water in the first regeneration pipeline flows back to the post-filter element through the four-pipe switching structure and the water outlet of the post-filter element to realize hot flushing.

[0011] 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, and the control valve group further includes: a second pipeline switching structure, having a first state in which the pre-filter element water outlet is connected to the fine filter element water inlet, and a second state in which the pre-filter element water outlet is connected to the second regeneration pipeline, when the water purification system executes the water production mode, the second pipeline switching structure is in the first state, when the water purification system executes the thermal regeneration mode, the second pipeline switching structure is in the second state; and / or a third pipeline switching structure, having a first state in which the pure water inlet is connected to the post-filter element water inlet, and a second state in which the post-filter element water inlet is connected to the drainage pipeline, when the water purification system executes the water production mode, the third pipeline switching structure is in the first state, when the water purification system executes the thermal regeneration mode, the third pipeline switching structure is in the second state.

[0012] Beneficial effects: The fine filter element can purify the tap water flowing out of the pre-filter element with high precision. The wastewater generated by purification is discharged from the wastewater outlet, and the purified tap water flows out from the pure water outlet to flow to the post-filter element. Therefore, the fine filter element can improve the water quality of purified tap water. The second pipeline switching structure plays a role in switching the connectivity state of the water outlet of the pre-filter element, and the third pipeline switching structure plays a role in switching the connectivity state of the water inlet of the pre-filter element, so as to realize the switching between water production mode and thermal regeneration mode.

[0013] In an optional embodiment, the first pipeline switching structure includes a first reversing valve, the water inlet of the first reversing valve is connected to the water inlet of the pre-filter, the first water outlet of the first reversing valve is connected to the tap water inlet, and the second water outlet of the first reversing valve is connected to the drainage pipeline. When the first pipeline switching structure is in the first state, the water inlet of the first reversing valve is connected to the first water outlet of the first reversing valve. When the first pipeline switching structure is in the second state, the water inlet of the first reversing valve is connected to the second water outlet of the first reversing valve.

[0014] Beneficial effect: when the first pipeline switching structure is in the first state, the water inlet of the first reversing valve is connected with the first water outlet of the first reversing valve, thereby connecting the water inlet of the pre-filter element and the tap water inlet, so that tap water can flow into the pre-filter element; when the first pipeline switching structure is in the second state, the water inlet of the first reversing valve is connected with the second water outlet of the first reversing valve, thereby connecting the water inlet of the pre-filter element and the drain pipeline, so that the hot water in the pre-filter element can be discharged.

[0015] In an optional embodiment, the second pipeline switching structure includes a second reversing valve, the water inlet of the second reversing valve is connected to the water outlet of the pre-filter element, the first water outlet of the second reversing valve is connected to the water inlet of the fine filter element, and the second water outlet of the second reversing valve is connected to the second regeneration pipeline. When the second pipeline switching structure is in the first state, the water inlet of the second reversing valve is connected to the first water outlet of the second reversing valve. When the second pipeline switching structure is in the second state, the water inlet of the second reversing valve is connected to the second water outlet of the second reversing valve.

[0016] Beneficial effect: when the second pipeline switching structure is in the first state, the water inlet of the second reversing valve is connected with the first water outlet of the second reversing valve, thereby connecting the water outlet of the pre-filter element and the water inlet of the fine filter element, so that tap water flows from the pre-filter element into the fine filter element; when the second pipeline switching structure is in the second state, the water inlet of the second reversing valve is connected with the second water outlet of the second reversing valve, thereby connecting the water outlet of the pre-filter element and the second regeneration pipeline, so that hot water flows from the second regeneration pipeline into the pre-filter element.

[0017] In an optional embodiment, the third pipeline switching structure includes a third reversing valve, the water inlet of the third reversing valve is connected to the water inlet of the post-filter element, the first water outlet of the third reversing valve is connected to the pure water port, and the second water outlet of the third reversing valve is connected to the drainage pipeline. When the third pipeline switching structure is in the first state, the water inlet of the third reversing valve is connected to the first water outlet of the third reversing valve. When the third pipeline switching structure is in the second state, the water inlet of the third reversing valve is connected to the second water outlet of the third reversing valve.

[0018] Beneficial effect: when the third pipeline switching structure is in the first state, the water inlet of the third reversing valve is connected with the first water outlet of the third reversing valve, thereby connecting the pure water inlet and the water inlet of the post-filter element, so that tap water flows from the fine filter element into the post-filter element; when the third pipeline switching structure is in the second state, the water inlet of the third reversing valve is connected with the second water outlet of the third reversing valve, thereby connecting the water inlet of the post-filter element and the drainage pipeline, so that hot water can be discharged from the post-filter element.

[0019] In an optional embodiment, the water outlet of the post-filter is connected to the heating water inlet through a post-water outlet pipe, and the fourth pipe switching structure includes a first control valve arranged on the first regeneration pipe and a second control valve arranged on the post-water outlet pipe. When the fourth pipe switching structure is in the first state, the first control valve is closed and the second control valve is opened. When the fourth pipe switching structure is in the second state, the first control valve is opened and the second control valve is closed.

[0020] Beneficial effect: By setting the fourth pipeline switching structure into the form of a first control valve and a second control valve, the opening and closing of the pipeline are independently controlled by opening and closing the two control valves, thereby realizing switching between different modes and having strong control independence.

[0021] In an optional embodiment, the second regeneration pipeline is connected to the first regeneration pipeline, and the connection between the second regeneration pipeline and the first regeneration pipeline is located upstream of the first control valve along the hot water flow direction.

[0022] Beneficial effect: When only the pre-filter element is reversely hot-flushed, the first control valve is closed to prevent hot water from flowing to the post-filter element. Hot water can only flow through the first regeneration pipeline and the second regeneration pipeline and then flow into the pre-filter element. When only the post-filter element is reversely hot-flushed, the second reversing valve is in the first state to disconnect the second regeneration pipeline, and the first control valve is opened to allow hot water to flow into the post-filter element through the first regeneration pipeline. The second regeneration pipeline is integrated with the first regeneration pipeline, which can save pipeline settings and reduce costs.

[0023] In an optional embodiment, the water purification system further includes a pure water tank, which is connected to both the rear water outlet pipe and the second regeneration pipe. When the water purification system executes the cooling mode, the room temperature pure water in the pure water tank flows sequentially through the rear water outlet pipe, the rear filter element water outlet, the rear filter element, the rear filter element water inlet and the drain pipe, and / or flows sequentially through the second regeneration pipe, the pre-filter element water outlet, the pre-filter element, the pre-filter element water inlet and the drain pipe.

[0024] Beneficial effect: The pure water tank set up can store the pure water purified by the water purification system in the water production mode, and when the water purification system executes the cooling mode, the room temperature pure water in the pure water tank can be provided to the pre-filter and / or post-filter to cool them.

[0025] In an optional embodiment, the pure water tank has a pure water tank inlet and a pure water tank outlet, the pure water tank inlet is connected to the rear water outlet pipe, and the pure water tank outlet is connected to the heating water inlet, and the water purification system also includes a cooling pipe, one end of the cooling pipe is connected to the pure water tank inlet, and the other end of the cooling pipe is connected to the first regeneration pipe, and along the flow direction of hot water, the connection between the cooling pipe and the first regeneration pipe is located upstream of the connection between the second regeneration pipe and the first regeneration pipe, and a first one-way valve is provided on the cooling pipe that only allows pure water in the pure water tank to flow from the cooling pipe to the first regeneration pipe.

[0026] Beneficial effect: The pure water in the pure water tank can also flow through the pure water tank water inlet, the cooling pipeline, the first regeneration pipeline, the second regeneration pipeline, and the pre-filter outlet in sequence in the cooling mode and flow into the pre-filter to cool the pre-filter. The setting of the first one-way valve limits the pure water to flow only in the cooling pipeline, and hot water cannot flow from the first regeneration pipeline through the first one-way valve into the cooling pipeline.

[0027] In an optional embodiment, a second one-way valve is provided on the first regeneration pipeline, which only allows hot water to flow from the heating device to the pre-filter element and the post-filter element. The second one-way valve is located upstream of the connection between the cooling pipeline and the first regeneration pipeline.

[0028] Beneficial effect: The setting of the second one-way valve limits hot water to flow only from the heating device to the first regeneration pipeline, and during cooling, the pure water in the pure water tank cannot flow into the heating device through the cooling pipeline and the first regeneration pipeline, ensuring the independent operation of the cooling mode and the thermal regeneration mode.

[0029] In an optional embodiment, the end of the cooling pipeline away from the first regeneration pipeline is connected to the rear water outlet pipeline, and the second control valve is a fourth reversing valve. When the water purification system executes the water production mode, the fourth reversing valve connects the pure water tank water inlet with the rear water outlet pipeline. When the water purification system executes the cooling mode, the fourth reversing valve connects the pure water tank water inlet with the rear water outlet pipeline, or connects the pure water tank water inlet with the cooling pipeline.

[0030] Beneficial effect: When the water purification system executes the water production mode, the fourth reversing valve connects the water inlet of the pure water tank with the rear water outlet pipe, so that the pure water purified by the rear filter element flows through the rear filter element outlet, the rear water outlet pipe, and the pure water tank inlet in sequence into the pure water tank. When the water purification system executes the cooling mode, the fourth reversing valve connects the water inlet of the pure water tank with the rear water outlet pipe, so that the pure water in the pure water tank flows back through the pure water tank inlet through the rear water outlet pipe and flows into the rear filter element to cool the rear filter element, or connects the water inlet of the pure water tank with the cooling pipe, so that the pure water in the pure water tank flows back through the pure water tank inlet through the cooling pipe, the first regeneration pipe, and the second regeneration pipe into the pre-filter element to cool the pre-filter element. It can be seen that the fourth reversing valve can connect the water inlet of the pure water tank with different pipes to realize switching between different usage modes.

[0031] In an optional embodiment, the water purification system has a working state of performing alternating operation of the heat regeneration mode and the cooling mode.

[0032] Beneficial effect: Through the alternating operation of the hot regeneration mode and the cooling mode, the pre-filter element and the post-filter element are thermally regenerated-cooled-hot regenerated-cooled. 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.

[0033] In an optional embodiment, the drainage pipeline includes a first drainage branch pipeline, a second drainage branch pipeline and a main drainage pipeline, the first drainage branch pipeline is connected to the water inlet of the pre-filter element, the second drainage branch pipeline is connected to the water inlet of the post-filter element, the main drainage pipeline is connected to the drain outlet, the main drainage pipeline is connected to both the first drainage branch pipeline and the second drainage branch pipeline, and a drain valve is provided on the main drainage pipeline.

[0034] Beneficial effect: The drain valve is opened in the thermal regeneration mode and the cooling mode. The hot water after flushing the pre-filter or the cooled pure water can flow into the first drainage branch pipe through the water inlet of the pre-filter, and then be discharged to the drain outlet through the main drainage pipe. The hot water after flushing the post-filter or the cooled pure water can flow into the second drainage branch pipe through the water inlet of the post-filter, and then be discharged to the drain outlet through the main drainage pipe.

[0035] In an optional embodiment, the thermal regeneration mode also includes a soaking state. In the soaking state, the drain valve is closed, and the pre-filter element and / or the post-filter element are soaked with hot water in the heating device.

[0036] Beneficial effect: The present application provides another method for active regeneration of the pre-filter element and / or the post-filter element, namely, in the soaking state, the drain valve is closed, and the hot water from the heating device flows into the pre-filter element and / or the post-filter element and accumulates, and the accumulated hot water is used to heat-soak the pre-filter element and / or the post-filter element, thereby also realizing thermal regeneration of the pre-filter element and / or the post-filter element. Compared with the flushing state, the soaking state can regenerate the pre-filter element and / or the post-filter element for a long time, achieving a more lasting thermal regeneration effect.

[0037] In an optional embodiment, the wastewater outlet is connected to a wastewater discharge pipeline, and a wastewater valve is provided on the wastewater discharge pipeline.

[0038] Beneficial effects: The wastewater discharge pipeline can transport the wastewater generated by the fine filter element to a long distance, and the wastewater valve is used to control the on-off of the wastewater discharge pipeline to achieve pressurized water purification for the fine filter element.

[0039] 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 heating device by obtaining the liquid level of the pre-filter element and / or the liquid level of the post-filter element.

[0040] 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 heating device is turned off to ensure that the hot water level during immersion meets the requirements and ensure the active regeneration effect of the pre-filter and / or post-filter.

[0041] 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 device. The temperature detector is suitable for obtaining the temperature value of the hot water so that the controller adjusts the heating power of the heating device according to the temperature value.

[0042] Beneficial effect: The temperature of the hot water 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 device according to the temperature value to ensure that the temperature of the hot water meets the heat regeneration requirements and ensure the heat regeneration effect.

[0043] In an optional embodiment, the water purification system further comprises a coarse filter element, which is connected in series to the upstream of the pre-filter element through the water production pipeline, and a booster pump is provided on the water production pipeline upstream of the coarse filter element.

[0044] Beneficial effects: tap water flows through the water inlet through the water treatment pipeline and then flows into the coarse filter element. 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 treatment pipeline to the water inlet of the pre-filter element. The booster pump provides power for the flow of tap water in the entire water purification system.

[0045] The second aspect of the present invention provides a control method for a water purification system, comprising the following steps: when the water purification system executes a thermal regeneration mode, the control valve group controls the hot water to flow through the heating water outlet, the first regeneration pipeline, the post-filter element water outlet, the post-filter element, the post-filter element water inlet and the drainage pipeline in sequence, thereby realizing reverse hot flushing of the post-filter element, and / or the control valve group controls the hot water to flow through the heating water outlet, the second regeneration pipeline, the pre-filter element water outlet, the pre-filter element, the pre-filter element water inlet and the drainage pipeline in sequence, thereby realizing reverse hot flushing of the pre-filter element.

[0046] Since the control method of the present invention is used to control a water purification system, the control method has the same technical effect as the water purification system and will not be described in detail here.

[0047] In an optional embodiment, when the purified water volume of the water purification system reaches a preset volume, or the lifespans of the pre-filter element and the post-filter element both reach preset lifespans, the water purification system executes the thermal regeneration mode.

[0048] Beneficial effect: The water purification system can execute the thermal regeneration mode according to the system's water purification volume or the life of the pre-filter element and the post-filter element, so as to achieve timely active regeneration of the pre-filter element and the post-filter element and ensure their service life.

[0049] In an optional embodiment, when the life of the pre-filter element reaches a first preset life and the life of the post-filter element has not reached a second preset life, the water purification system executes the thermal regeneration mode to only perform active regeneration on the pre-filter element; when the life of the pre-filter element has not reached the first preset life and the life of the post-filter element reaches the second preset life, the water purification system executes the thermal regeneration mode to only perform active regeneration on the post-filter element.

[0050] Beneficial effects: The water purification system can also execute the thermal regeneration mode according to the respective service life of the pre-filter and post-filter (i.e. the degree of pollution), so as to realize the independent active regeneration of the pre-filter or post-filter in time and ensure the service life of both.

[0051] In an optional embodiment, the water purification system executes the thermal regeneration mode specifically including: the water purification system executes the thermal regeneration mode to enter a reverse hot flushing state, or the water purification system executes the thermal regeneration mode to enter a soaking state, or the water purification system executes the reverse hot flushing state and the cooling mode in the thermal regeneration mode alternately.

[0052] Beneficial effects: The water purification system performs thermal regeneration mode, which includes a variety of regeneration methods, which can be selected according to needs, with strong selectivity and applicability.

[0053] In an optional embodiment, the temperature of the hot water is greater than the ambient temperature and less than the boiling point of water.

[0054] Beneficial effect: limiting the temperature of hot water within an appropriate range can not only achieve active regeneration of the pre-filter and / or post-filter at room temperature, but also avoid excessive water consumption / time when cooling the pre-filter and / or post-filter due to excessive hot water temperature, resulting in waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] 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.

[0056] Figure 1 It shows a schematic diagram of the overall connection structure of the water purification system in an embodiment of the present invention;

[0057] Figure 2 A schematic diagram of tap water flow in a water purification system in water production mode according to an embodiment of the present invention is shown;

[0058] Figure 3 A schematic diagram of hot water flow in a water purification system for backwashing a pre-filter element according to an embodiment of the present invention is shown;

[0059] Figure 4 A schematic diagram showing the flow of hot water in a water purification system for backwashing a post-filter element according to an embodiment of the present invention is shown;

[0060] Figure 5 A schematic diagram of the flow of pure water used by a water purification system to cool a pre-filter element in an embodiment of the present invention is shown;

[0061] Figure 6 A schematic diagram of the flow of pure water used by a water purification system to cool a post-filter element in an embodiment of the present invention is shown.

[0062] Description of reference numerals:

[0063] 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. Heating device; 41. Heating water inlet; 42. Heating water outlet; 5. Pure water tank; 51. Pure water tank water inlet; 52. Pure water tank outlet; 6. Coarse filter element; 61. Coarse filter water inlet; 62. Coarse filter outlet;

[0064] 100, water production pipeline; 101, first reversing valve; 102, second reversing valve; 103, third reversing valve; 104, booster pump; 200, first regeneration pipeline; 201, first control valve; 202, second one-way valve; 300, second regeneration pipeline; 400, post-water outlet pipeline; 401, fourth reversing valve; 500, drainage pipeline; 501, first drainage branch pipeline; 502, second drainage branch pipeline; 503, main drainage pipeline; 5031, drainage valve; 600, cooling pipeline; 601, first one-way valve; 700, wastewater discharge pipeline; 701, wastewater valve; 800, water tank connecting pipeline. DETAILED DESCRIPTION

[0065] 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.

[0066] The following combination Figures 1 to 6 , describing embodiments of the present invention.

[0067] According to an embodiment of the present invention, Figure 1 As shown, a water purification system is provided, including a water making device, a heating device 4, a backwash pipe and a control valve group, the water making device includes a water making pipeline 100 and a pre-filter element 1 and a post-filter element 3 connected in series to the water making pipeline 100 in sequence, the pre-filter element 1 and the post-filter element 3 both include a carbon water purification unit, the pre-filter element 1 has a pre-filter element water inlet 11 and a pre-filter element water outlet 12, the post-filter element 3 has a post-filter element water inlet 31 and a post-filter element water outlet 32, the heating device 4 has a heating water inlet 41 and a heating water outlet 42, the heating water outlet 42 is connected to the water intake end, the backwash pipeline includes a first regeneration pipeline 200 connected in parallel between the heating water outlet 42 and the post-filter element water outlet 32, And a second regeneration pipeline 300 connected in parallel between the heating water outlet 42 and the pre-filter water outlet 12, and a drainage pipeline 500 respectively connected to the post-filter water inlet 31 and the pre-filter water inlet 11, the control valve group is arranged in the water production pipeline 100 and the backwash pipeline, suitable for controlling the water purification system to perform the thermal regeneration mode, and controlling the hot water to flow through the heating water outlet 42, the first regeneration pipeline 200, the post-filter water outlet 32, the post-filter 3, the post-filter water inlet 31 and the drainage pipeline 500 in sequence, and / or flow through the heating water outlet 42, the second regeneration pipeline 300, the pre-filter water outlet 12, the pre-filter 1, the pre-filter water inlet 11 and the drainage pipeline 500 in sequence.

[0068] In the water purification system of this embodiment, tap water flows into the pre-filter element 1 and the post-filter element 3 in sequence through the water production pipeline 100 to achieve tap water purification, and by connecting the first regeneration pipeline 200 in parallel between the heating water outlet 42 and the post-filter element water outlet 32, and the second regeneration pipeline 300 in parallel between the heating water outlet 42 and the pre-filter element water outlet 12, and setting a drainage pipeline 500 respectively connected to the post-filter element water inlet 31 and the pre-filter element water inlet 11, the water purification system can execute the thermal regeneration mode according to the use of the pre-filter element 1 and the post-filter element 3. When the control valve group When the water purification system is controlled to execute the thermal regeneration mode, the hot water in the heating device 4 can be reversely input into the pre-filter element 1 and / or the post-filter element 3 to perform reverse thermal flushing and regeneration. The 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 allowing the carbon water purification unit to restore some of its adsorption capacity and realize the 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. At the same time, it also increases the rated water purification capacity of the entire water purification system, with excellent economic benefits.

[0069] It is understandable that the water purification system can execute the thermal regeneration mode according to the use of the pre-filter element 1 and the post-filter element 3, which specifically includes: when only the pre-filter element 1 is used and the pollution level is relatively high, when the thermal regeneration mode is executed, hot water flows through the heating water outlet 42, the second regeneration pipeline 300, the pre-filter element water outlet 12, the pre-filter element 1, the pre-filter element water inlet 11 and the drainage pipeline 500 in sequence to achieve active regeneration of the pre-filter element 1; when only the post-filter element 3 is used and the pollution level is relatively high, when the thermal regeneration mode is executed, hot water flows through the heating water outlet 42, the first regeneration pipeline 200, the post-filter element water outlet 32, the post-filter element 3. The water inlet 31 of the post-filter element and the drainage pipe 500 are connected to realize the active regeneration of the post-filter element 3; when the degree of pollution of the pre-filter element 1 and the post-filter element 3 is relatively high, when the thermal regeneration mode is executed, the hot water flows through the heating water outlet 42, the first regeneration pipe 200, the water outlet 32 of the post-filter element, the post-filter element 3, the water inlet 31 of the post-filter element and the drainage pipe 500 in sequence, and flows through the heating water outlet 42, the second regeneration pipe 300, the water outlet 12 of the pre-filter element, the pre-filter element 1, the water inlet 11 of the pre-filter element and the drainage pipe 500 in sequence, so as to realize the simultaneous active regeneration of the pre-filter element 1 and the post-filter element 3.

[0070] When the water purification system is in water production mode, tap water flows forward along the water production pipeline 100 and sequentially passes through the pre-filter 1 and post-filter 3 for purification. In thermal regeneration mode, hot water flows in the opposite direction of the tap water.

[0071] In this embodiment, the pre-filter element 1 is an activated carbon filter element, which includes multiple carbon water purification units and can effectively remove oxidizing substances such as residual chlorine. 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.

[0072] 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.

[0073] The post-filter element 3 receives the tap water filtered by the pre-filter element 1 and can filter the tap water again to remove trace elements, adjust the pH and drinking taste.

[0074] Specifically, the post-filter element 3 may also be an activated carbon filter element comprising a plurality of carbon water purification units.

[0075] Heating device 4 is used to heat tap water to produce hot water for thermal regeneration of pre-filter element 1 and / or post-filter element 3. Specifically, heating device 4 can be a heating tank or a heating box, etc., with a heating water inlet 41 and a heating water outlet 42 provided on the housing of heating device 4. Heating water outlet 42 is connected to a water intake port for users to obtain hot water.

[0076] It should be noted that the temperature of the hot water used in the heat regeneration mode of this embodiment is higher than normal temperature and lower than the boiling point of water.

[0077] The first regeneration pipeline 200 connects the heating water outlet 42 and the post-filter outlet 32, and can transport the hot water in the heating device 4 to the post-filter 3 through the first regeneration pipeline 200 over a long distance in the thermal regeneration mode to achieve active regeneration of the post-filter 3.

[0078] The second regeneration pipeline 300 connects the heating water outlet 42 and the pre-filter outlet 12, and can transport the hot water in the heating device 4 to the pre-filter 1 through the second regeneration pipeline 300 over a long distance in the thermal regeneration mode to achieve active regeneration of the pre-filter 1.

[0079] The drainage pipe 500 is connected to the water inlet 11 of the pre-filter element and the water inlet 31 of the post-filter element respectively, and can timely discharge the hot water generated by flushing the pre-filter element 1 and the post-filter element 3 in the thermal regeneration mode, thereby realizing continuous flushing and regeneration of the pre-filter element 1 and the post-filter element 3.

[0080] In this embodiment, the water purification system further includes a fine filter element 2, which is connected in series between the pre-filter element 1 and the post-filter element 3 via a water production pipeline 100. The fine filter element 2 has a fine filter element water inlet 21, a pure water inlet 23, and a wastewater inlet 22. The fine filter element 2 can perform high-precision purification on the tap water flowing out of the pre-filter element 1. The wastewater produced by purification is discharged from the wastewater inlet 22, and the purified tap water flows out from the pure water inlet 23 to the post-filter element 3. Therefore, the fine filter element 2 can improve the quality of the purified tap water.

[0081] Compared to the pre-filter element 1 and the post-filter element 3, the fine filter element 2 has a higher filtration accuracy and 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 accuracy requirements. This embodiment does not specifically limit it.

[0082] The control valve group of this embodiment also includes a first pipeline switching structure, which has a first state in which the pre-filter cartridge water inlet 11 is connected to the tap water inlet, and a second state in which the pre-filter cartridge water inlet 11 is connected to the drain pipe 500. According to the above configuration, when the water purification system performs the water production mode, the first pipeline switching structure is in the first state, and the tap water flows through the tap water inlet, the water production pipe 100, and the pre-filter cartridge water inlet 11 in sequence to enter the pre-filter cartridge 1 for purification. When the water purification system performs the thermal regeneration mode, the first pipeline switching structure is in the second state, and the hot water after flushing in the pre-filter cartridge 1 can flow from the pre-filter cartridge water inlet 11 into the drain pipe 500 for discharge. Therefore, the first pipeline switching structure plays a role in switching the connection state of the pre-filter cartridge water inlet 11 to achieve switching between the water production mode and the thermal regeneration mode.

[0083] The first pipeline switching structure includes a first reversing valve 101, the water inlet of the first reversing valve 101 is connected to the water inlet 11 of the pre-filter element, the first water outlet of the first reversing valve 101 is connected to the tap water inlet, and the second water outlet of the first reversing valve 101 is connected to the drain pipe 500. When the first pipeline switching structure is in the first state, the water inlet of the first reversing valve 101 is connected to the first water outlet of the first reversing valve 101, thereby connecting the water inlet 11 of the pre-filter element and the tap water inlet, so that tap water can flow into the pre-filter element 1. When the first pipeline switching structure is in the second state, the water inlet of the first reversing valve 101 is connected to the second water outlet of the first reversing valve 101, thereby connecting the water inlet 11 of the pre-filter element and the drain pipe 500, so that the hot water in the pre-filter element 1 can be discharged.

[0084] The first reversing valve 101 may specifically be a two-way valve.

[0085] In this embodiment, the control valve group further includes a second pipeline switching structure having a first state in which the pre-filter cartridge water outlet 12 is connected to the fine filter cartridge water inlet 21, and a second state in which the pre-filter cartridge water outlet 12 is connected to the second regeneration pipeline 300. With the above arrangement, when the water purification system is in water production mode, the second pipeline switching structure is in the first state, and the tap water purified by the pre-filter cartridge 1 flows sequentially through the pre-filter cartridge water outlet 12, the second pipeline switching structure, and the fine filter cartridge water inlet 21 into the fine filter cartridge 2 for high-precision purification. When the water purification system is in thermal regeneration mode, the second pipeline switching structure is in the second state, and the hot water in the second regeneration pipeline 300 flows sequentially through the second pipeline switching structure and the pre-filter cartridge water outlet 12 into the pre-filter cartridge 1, achieving reverse hot flushing of the pre-filter cartridge 1. Therefore, the second pipeline switching structure serves to switch the connection state of the pre-filter cartridge water outlet 12 to achieve switching between water production mode and thermal regeneration mode.

[0086] Optionally, the second pipeline switching structure includes a second reversing valve 102, the water inlet of the second reversing valve 102 is connected to the pre-filter cartridge water outlet 12, the first water outlet of the second reversing valve 102 is connected to the fine filter cartridge water inlet 21, and the second water outlet of the second reversing valve 102 is connected to the second regeneration pipeline 300. When the second pipeline switching structure is in the first state, the water inlet of the second reversing valve 102 is connected to the first water outlet of the second reversing valve 102, thereby connecting the pre-filter cartridge water outlet 12 and the fine filter cartridge water inlet 21, so that tap water flows from the pre-filter cartridge 1 to the fine filter cartridge 2. When the second pipeline switching structure is in the second state, the water inlet of the second reversing valve 102 is connected to the second water outlet of the second reversing valve 102, thereby connecting the pre-filter cartridge water outlet 12 and the second regeneration pipeline 300, so that hot water flows from the second regeneration pipeline 300 into the pre-filter cartridge 1.

[0087] The second reversing valve 102 may specifically be a two-way valve.

[0088] In this embodiment, the control valve group further includes a third pipeline switching structure, which has a first state for connecting the pure water port 23 with the post-filter cartridge water inlet 31, and a second state for connecting the post-filter cartridge water inlet 31 with the drain pipe 500. According to the above configuration, when the water purification system performs the water production mode, the third pipeline switching structure is in the first state, and the tap water purified by the fine filter cartridge 2 flows through the pure water port 23, the third pipeline switching structure, and the post-filter cartridge water inlet 31 in sequence to enter the post-filter cartridge 3 for further purification. When the water purification system performs the thermal regeneration mode, the third pipeline switching structure is in the second state, so as to facilitate the discharge of the hot water in the post-filter cartridge 3 to the drain pipe 500 through the post-filter cartridge water inlet 31. Therefore, the third pipeline switching structure plays a role in switching the connection state of the post-filter cartridge water inlet 31 to achieve switching between the water production mode and the thermal regeneration mode.

[0089] Correspondingly, the third pipeline switching structure includes a third reversing valve 103, the water inlet of the third reversing valve 103 is connected to the water inlet 31 of the post-filter element, the first water outlet of the third reversing valve 103 is connected to the pure water port 23, and the second water outlet of the third reversing valve 103 is connected to the drain pipeline 500. When the third pipeline switching structure is in the first state, the water inlet of the third reversing valve 103 is connected to the first water outlet of the third reversing valve 103, thereby connecting the pure water port 23 and the water inlet 31 of the post-filter element, so that tap water flows from the fine filter element 2 into the post-filter element 3. When the third pipeline switching structure is in the second state, the water inlet of the third reversing valve 103 is connected to the second water outlet of the third reversing valve 103, thereby connecting the water inlet 31 of the post-filter element and the drain pipeline 500, so that hot water is discharged from the post-filter element 3.

[0090] The third reversing valve 103 may specifically be a two-way valve.

[0091] In this embodiment, the control valve group also includes a fourth pipeline switching structure, which has a first state in which the post-filter cartridge water outlet 32 is connected to the heating water inlet 41, and a second state in which the post-filter cartridge water outlet 32 is connected to the first regeneration pipeline 200. When the water purification system executes the water production mode, the fourth pipeline switching structure is in the first state to connect the post-filter cartridge water outlet 32 with the heating water inlet 41, so that the purified tap water flows through the fourth pipeline switching structure and the heating water inlet 41 into the heating device 4. When the water purification system executes the hot regeneration mode, the fourth pipeline switching structure is in the second state, so that the post-filter cartridge water outlet 32 is connected to the first regeneration pipeline 200, so that the hot water in the first regeneration pipeline 200 flows back to the post-filter cartridge 3 through the four-pipe switching structure and the post-filter cartridge water outlet 32 to achieve hot flushing.

[0092] The post-filter outlet 32 is connected to the heating water inlet 41 through the post-filter outlet pipe 400, so that the tap water purified in the post-filter 3 flows through the post-filter outlet 32, the post-filter outlet pipe 400, and the heating water inlet 41 in sequence and flows into the heating device 4.

[0093] In this embodiment, the fourth pipeline switching structure includes a first control valve 201 arranged on the first regeneration pipeline 200 and a second control valve arranged on the rear water outlet pipeline 400. When the fourth pipeline switching structure is in the first state, the first control valve 201 is closed and the second control valve is opened, that is, the first regeneration pipeline 200 is disconnected and the rear water outlet pipeline 400 is connected, thereby realizing tap water purification. When the fourth pipeline switching structure is in the second state, the first control valve 201 is opened and the second control valve is closed, that is, the first regeneration pipeline 200 is connected and the rear water outlet pipeline 400 is disconnected, thereby realizing hot water flowing into the rear filter element 3 for hot flushing.

[0094] In this embodiment, to conserve piping and reduce costs, the second regeneration pipeline 300 is connected to the first regeneration pipeline 200, and the connection between the second regeneration pipeline 300 and the first regeneration pipeline 200 is located upstream of the first control valve 201 in the direction of hot water flow. When only the pre-filter element 1 is being hot-flushed in the reverse direction, the first control valve 201 is closed to prevent hot water from flowing to the post-filter element 3. Hot water can only flow through the first regeneration pipeline 200 and the second regeneration pipeline 300 before flowing into the pre-filter element 1. When only the post-filter element 3 is being hot-flushed in the reverse direction, the second reversing valve 102 is in the first state to disconnect the second regeneration pipeline 300, and the first control valve 201 is opened to allow hot water to flow through the first regeneration pipeline 200 into the post-filter element 3.

[0095] The first control valve 201 is specifically an on-off valve, which is used to control the on-off of the first regeneration pipeline 200 .

[0096] In this embodiment, the end of the first regeneration pipeline 200 away from the heating device 4 is connected to the rear water outlet pipeline 400 and the connection between the first regeneration pipeline 200 and the rear water outlet pipeline 400 is located upstream of the second control valve along the flow direction of the tap water production mode.

[0097] The water purification system of this embodiment further includes a pure water tank 5, which is connected to both the rear water outlet pipe 400 and the second regeneration pipe 300. When the water purification system is in cooling mode, the room-temperature pure water in the pure water tank 5 flows sequentially through the rear water outlet pipe 400, the rear filter element water outlet 32, the rear filter element 3, the rear filter element water inlet 31, and the drain pipe 500, and / or flows sequentially through the second regeneration pipe 300, the pre-filter element water outlet 12, the pre-filter element 1, the pre-filter element water inlet 11, and the drain pipe 500, so as to cool the pre-filter element 1 and / or the rear filter element 3, thereby preventing the pre-filter element 1 and / or the rear filter element 3 from being overheated and affecting normal water production.

[0098] It is understandable that the cooling mode is generally executed after the thermal regeneration mode is running to cool the pre-filter element 1 and / or post-filter element 3 that generate high temperature in the thermal regeneration mode. Only after cooling can the water purification system enter the water production mode.

[0099] Furthermore, the pure water tank 5 has a pure water tank inlet 51 and a pure water tank outlet 52. The pure water tank inlet 51 is connected to the rear water outlet pipe 400, and the pure water tank outlet 52 is connected to the heating water inlet 41. In the water production mode, the pure water tank 5 can flow the tap water purified by the system into the pure water tank 5 through the rear water outlet pipe 400 and the pure water tank inlet 51 for storage, while the pure water tank outlet 52 is connected to the heating water inlet 41, so that the pure water in the pure water tank 5 can be input into the heating device 4 for heating so that the user can take it or use it in the heat regeneration mode. In the cooling mode, the pure water in the pure water tank 5 can also flow through the pure water tank inlet 51, the rear water outlet pipe 400, and the rear filter element outlet 32 in sequence into the rear filter element 3 to cool the rear filter element 3.

[0100] It is understood that the pure water tank 5 can be configured in a variety of ways. For example, the pure water tank 5 in a desktop water purifier requires an external drive pump for water extraction or regeneration. The pure water tank 5 in a commercial water purifier, for example, is a pressure tank model, which does not require an external drive pump and can store a certain volume of purified water and be driven by pressure for water extraction or regeneration. In this technical solution, the pure water tank 5 is implemented as a pure water tank 5 plus a drive pump.

[0101] In this embodiment, the water purification system also includes a cooling pipeline 600, one end of the cooling pipeline 600 is connected to the water inlet 51 of the pure water tank, and the other end of the cooling pipeline 600 is connected to the first regeneration pipeline 200, and the connection between the cooling pipeline 600 and the first regeneration pipeline 200 is located upstream of the connection between the second regeneration pipeline 300 and the first regeneration pipeline 200 along the flow direction of hot water, and a first one-way valve 601 is provided on the cooling pipeline 600, which only allows the pure water in the pure water tank 5 to flow from the cooling pipeline 600 to the first regeneration pipeline 200. The pure water in the pure water tank 5 can also flow through the pure water tank water inlet 51, the cooling pipeline 600, the first regeneration pipeline 200, the second regeneration pipeline 300, and the pre-filter outlet 12 in sequence in the cooling mode and flow into the pre-filter 1 to cool the pre-filter 1. The setting of the first one-way valve 601 limits the pure water to flow only in the cooling pipeline 600, and hot water cannot flow from the first regeneration pipeline 200 through the first one-way valve 601 into the cooling pipeline 600.

[0102] In addition, the first regeneration pipeline 200 of this embodiment is provided with a second one-way valve 202 that only allows hot water to flow from the heating device 4 to the pre-filter element 1 and the post-filter element 3. The second one-way valve 202 is located upstream of the connection between the cooling pipeline 600 and the first regeneration pipeline 200. The provision of the second one-way valve 202 limits the flow of hot water to only from the heating device 4 to the first regeneration pipeline 200, while during cooling, the pure water in the pure water tank 5 cannot flow through the cooling pipeline 600 and the first regeneration pipeline 200 into the heating device 4, thereby ensuring the independent operation of the cooling mode and the thermal regeneration mode. It is not difficult to understand that, as a replacement for the same structure, the first one-way valve 601 and the second one-way valve 202 can also be set as ordinary stop valves, and the cooling pipeline 600 and the first thermal regeneration pipe are connected or disconnected by controlling the opening and closing of the stop valves, which is not limited to the solution of this embodiment.

[0103] In order to further improve the integration of the system pipeline, the cooling pipeline 600 is connected to the rear water outlet pipeline 400 at one end away from the first regeneration pipeline 200, and the second control valve is the fourth reversing valve 401. When the water purification system performs the water production mode, the fourth reversing valve 401 connects the pure water tank water inlet 51 with the rear water outlet pipeline 400, so that the pure water purified by the rear filter element 3 flows through the rear filter element water outlet 32, the rear water outlet pipeline 400, and the pure water tank water inlet 51 into the pure water tank 5 in sequence. When the water purification system performs the cooling mode, the fourth reversing valve 401 connects the pure water tank water inlet 51 with the rear water outlet pipeline 400. The four-way reversing valve 401 connects the pure water tank inlet 51 with the rear water outlet pipe 400, so that the pure water in the pure water tank 5 flows back through the pure water tank inlet 51 through the rear water outlet pipe 400 and flows into the rear filter element 3 to cool the rear filter element 3, or connects the pure water tank inlet 51 with the cooling pipe 600, so that the pure water in the pure water tank 5 flows back through the pure water tank inlet 51 through the cooling pipe 600, the first regeneration pipe 200, and the second regeneration pipe 300 and flows into the pre-filter element 1 to cool the pre-filter element 1.

[0104] In this embodiment, the water purification system operates in alternating hot regeneration and cooling modes. This alternating hot regeneration and cooling modes achieves a cycle of hot regeneration, cooling, hot regeneration, and cooling for the pre-filter element 1 and the post-filter element 3. This cycle ensures 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 hot regeneration mode.

[0105] The pure water tank outlet 52 and the heating water inlet 41 are connected through the water tank connecting pipe 800, so that the pure water in the pure water tank 5 flows through the pure water tank outlet 52, the water tank connecting pipe 800, and the heating water inlet 41 in sequence and flows into the heating device 4.

[0106] In this embodiment, the drainage pipeline 500 includes a first drainage branch pipeline 501, a second drainage branch pipeline 502, and a main drainage pipeline 503. The first drainage branch pipeline 501 is connected to the pre-filter inlet 11, the second drainage branch pipeline 502 is connected to the post-filter inlet 31, and the main drainage pipeline 503 is connected to the drain outlet. The main drainage pipeline 503 is connected to both the first drainage branch pipeline 501 and the second drainage branch pipeline 502. The main drainage pipeline 503 is provided with a drain valve 5031. The drain valve 5031 is open in the hot regeneration mode and the cooling mode. The hot water after flushing the pre-filter 1 or the cooled pure water can flow into the first drainage branch pipeline 501 through the pre-filter inlet 11 and then be discharged to the drain outlet through the main drainage pipeline 503. The hot water after flushing the post-filter 3 or the cooled pure water can flow into the second drainage branch pipeline 502 through the post-filter inlet 31 and then be discharged to the drain outlet through the main drainage pipeline 503.

[0107] 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 5031 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.

[0108] In this embodiment, the thermal regeneration mode also includes a soaking state, in which the drain valve 5031 is closed, and the hot water in the heating device 4 is used to soak the pre-filter element 1 and / or the post-filter element 3. The present application provides another way to actively regenerate the pre-filter element 1 and / or the post-filter element 3, namely, in the soaking state, the drain valve 5031 is closed, and the hot water in the heating device 4 flows into the pre-filter element 1 and / or the post-filter element 3 and accumulates. The accumulated hot water is used to thermally soak the pre-filter element 1 and / or the post-filter element 3, thereby also achieving thermal regeneration of the pre-filter element 1 and / or the post-filter element 3. Compared with the flushing state, the soaking state can regenerate the pre-filter element 1 and / or the post-filter element 3 for a long time, achieving a more lasting thermal regeneration effect.

[0109] It should be noted here that when the soaking state reaches a certain length of time, the drain valve 5031 needs to be opened to discharge the hot water after soaking through the drain pipe 500.

[0110] 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 time periods, which is not specifically limited in this embodiment.

[0111] Therefore, the water purification system of this embodiment has two thermal regeneration modes, namely, back flushing and immersion. The user can choose either one according to the degree of contamination of the pre-filter 1 and the post-filter 3. For example, if the pre-filter 1 and the post-filter 3 are lightly contaminated or only a short-term disinfection of the pre-filter 1 and the post-filter 3 is desired, back flushing is used for thermal regeneration. If the pre-filter 1 and the post-filter 3 are heavily contaminated or a long-term regeneration of the pre-filter 1 and the post-filter 3 is desired, immersion is used for thermal regeneration. Therefore, both methods can be selected according to actual needs.

[0112] Furthermore, the wastewater outlet 22 is connected to the wastewater discharge pipe 700, and a wastewater valve 701 is provided on the wastewater discharge pipe 700. The wastewater discharge pipe 700 can transport the wastewater generated by the fine filter element 2 over a long distance, and the wastewater valve 701 is used to control the on and off of the wastewater discharge pipe 700 to achieve pressurized water purification for the fine filter element 2.

[0113] In order to further enhance the pipeline integration and reduce the pipeline setting volume, the first drainage branch pipeline 501 of this embodiment is connected to the water supply pipeline 100 upstream of the pre-filter element 1, the second drainage branch pipeline 502 is connected to the water supply pipeline 100 between the fine filter element 2 and the post-filter element 3, the wastewater discharge pipeline 700 is connected to the main drainage pipeline 503 and the connection point is located downstream of the drain valve 5031, and the second regeneration pipeline 300 is connected to the water supply pipeline 100 between the pre-filter element 1 and the fine filter element 2.

[0114] Preferably, the first reversing valve 101 is arranged at the connection between the first drainage branch line 501 and the water supply line 100 upstream of the pre-filter element 1, the second reversing valve 102 is arranged at the connection between the second regeneration line 300 and the water supply line 100 between the pre-filter element 1 and the fine filter element 2, and the third reversing valve 103 is arranged at the connection between the second drainage branch line 502 and the water supply line 100 between the fine filter element 2 and the post-filter element 3.

[0115] It should be noted here that, in some embodiments, the first pipeline switching structure can also be configured to respectively set switch valves on the first drainage branch pipeline 501 and the water production pipeline 100 upstream of the pre-filter 1. In the water production mode, the switch valve on the water production pipeline 100 is opened and the switch valve on the first drainage branch pipeline 501 is closed. In the heat regeneration mode, the switch valve on the water production pipeline 100 is closed and the switch valve on the first drainage branch pipeline 501 is opened, which can also play the same role as this embodiment.

[0116] Similarly, in some embodiments, the second pipeline switching structure and the third pipeline switching structure can be set in other forms with reference to the first pipeline switching structure, which will not be repeated here.

[0117] In addition to the above settings, the water purification system also includes a liquid level detector arranged in 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 heating device 4 by obtaining the liquid level of the pre-filter element 1 and / or the liquid level of the post-filter element 3.

[0118] The above setting uses a 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 heating device 4 is turned off to ensure that the hot water level during immersion meets the requirements and ensure the active regeneration effect of the pre-filter element 1 and / or the post-filter element 3.

[0119] The heating device 4 can be configured as a hot tank with a certain pressure. The hot tank drives the heated hot water to flow by its own pressure. Here, the opening and closing of the heating device 4 is controlled according to the liquid level detected by the liquid level detector, which actually controls the opening and closing of the heated water outlet of the hot tank. Of course, a pressure pump can also be configured in the heating device 4 to pump the hot water. Here, the opening and closing of the heating device 4 is controlled according to the liquid level detected by the liquid level detector, which actually controls the opening and closing of the pressure pump.

[0120] Specifically, liquid level detectors may be respectively provided on the pre-filter element 1 and the post-filter element 3 to detect the liquid levels of the pre-filter element 1 and the post-filter element 3 respectively.

[0121] Preferably, the preset liquid level may be a liquid level that at least covers one-half or two-thirds of the pre-filter element 1 and / or the post-filter element 3 , and this embodiment does not impose any specific limitation.

[0122] The water purification system also includes a temperature detector and a controller. The controller is in communication with both the temperature detector and the heating device 4. The temperature detector is adapted to obtain the temperature of the hot water so that the controller can adjust the heating power of the heating device 4 based on the temperature value. The temperature detector obtains the temperature of the hot water and promptly feeds the water temperature back to the controller. The controller can automatically adjust the heating power of the heating device 4 based on the temperature value to ensure that the temperature of the hot water meets the thermal regeneration requirements and ensures the thermal regeneration effect.

[0123] Specifically, when the temperature detector detects that the temperature of the hot water is too low, the controller increases the heating power of the heating device 4 to quickly heat the tap water. When the temperature detector detects that the temperature of the hot water is too high, the controller reduces the heating power of the heating device 4. The hot water temperature will be lowered and the loss of the heating device 4 will also be reduced.

[0124] As for the specific setting position, the temperature detector can be set on the pre-filter element 1 and the post-filter element 3, or can be set on the first regeneration pipeline 200 and the second regeneration pipeline 300 respectively, or can be set on the heating device 4. It can be set according to specific needs, and this embodiment does not make specific restrictions.

[0125] In addition, it is understandable that water can also be added to the heating device 4 through the pure water tank 5 to mix the pure water with the hot water, which can also achieve the adjustment of the hot water temperature in the heating device 4.

[0126] In this embodiment, the water purification system also includes a coarse filter cartridge 6, which is connected in series upstream of the pre-filter cartridge 1 via a water supply line 100. A booster pump 104 is provided on the water supply line 100 upstream of the coarse filter cartridge 6. Tap water flows through the tap water inlet, through the water supply line 100, and then into the coarse filter cartridge 6. The coarse filter cartridge 6 filters out large particles of impurities in the tap water, allowing the coarsely filtered tap water to flow through the water supply line 100 to the pre-filter cartridge inlet 11. The booster pump 104 provides power for the flow of tap water throughout the water purification system.

[0127] Specifically, the coarse filtration filter element 6 has a coarse filtration water inlet 61 and a coarse filtration water outlet 62, wherein the coarse filtration water inlet 61 is connected to the tap water inlet through the water production pipeline 100, and the coarse filtration water outlet 62 is connected to the pre-filter element water inlet 11 through the water production pipeline 100.

[0128] Optionally, the coarse filter element 6 can 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 subsequent pre-filter element 1.

[0129] To facilitate understanding of the water purification system of this embodiment, the following description is given of its use process:

[0130] In water production 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 production mode. The booster pump 104 and the waste water valve 701 are all open, the drain valve 5031 is closed, the first pipeline switching structure, the second pipeline switching structure, the third pipeline switching structure and the fourth pipeline switching structure are all in the first state, and the tap water flows into the water production pipeline 100 through the tap water inlet, and flows through the coarse filter element 6 for coarse filtration in sequence, flows through the pre-filter element 1 to perform secondary purification on the coarsely filtered tap water, and flows through the fine filter element 2 to perform high-precision filtration on the secondary filtered tap water. The waste water generated by the filtration is discharged into the waste water discharge pipeline 700 through the waste water port 22, and the filtered tap water flows into the post-filter element 3 through the pure water port 23 for filtration and pH adjustment. The obtained pure water flows through the post-water outlet pipeline 400 into the pure water tank 5 for storage. The pure water in the pure water tank 5 can flow into the heating device 4 through the water tank connecting pipeline 800 for heating, and the heated hot water can flow to the water intake end for use;

[0131] When the pre-filter element 1 is backwashed in the thermal regeneration mode, Figure 3 As shown, Figure 3The direction indicated by the medium bold line and arrow is the flow direction of hot water for reverse flushing the pre-filter element 1. The drain valve 5031 is opened, the first control valve 201 is closed, and the first pipeline switching structure and the second pipeline switching structure are both switched to the second state. The pure water in the pure water tank 5 flows into the heating device 4 through the water tank connecting pipeline 800 to be heated into hot water. The hot water flows in sequence through the heating water outlet 42, the first regeneration pipeline 200, the second regeneration pipeline 300, the second reversing valve 102, the pre-filter element water outlet 12, the pre-filter element 1, the pre-filter element water inlet 11, the first reversing valve 101, and the drain pipeline 500 to achieve reverse hot flushing of the pre-filter element 1 and active regeneration.

[0132] When the pre-filter element 1 is soaked in the heat regeneration mode, it is only necessary to close the drain valve 5031 to allow hot water to flow into the pre-filter element 1 according to the above flow path. When the liquid level detector detects that the hot water level has reached the preset level, the driving pump of the heating device 4 is turned off, and the pre-filter element 1 is soaked in hot water. After soaking for a certain period of time, the drain valve 5031 is opened to drain the soaked hot water.

[0133] When the post filter element 3 is backwashed in the thermal regeneration mode, Figure 4 As shown, Figure 4 The direction indicated by the medium thick line and the arrow is the flow direction of the hot water for reverse flushing the post-filter element 3. The drain valve 5031 and the first control valve 201 are opened, the second pipeline switching structure is switched to the first state, the third pipeline switching structure is switched to the second state, the fourth reversing valve 401 connects the pure water tank inlet 51 and the cooling pipeline 600, and the pure water in the pure water tank 5 flows into the heating device 4 through the water tank connecting pipeline 800 to be heated into hot water. The hot water flows through the heating outlet 42, the first regeneration pipeline 200, the post-filter outlet pipeline 400, the post-filter element outlet 32, the post-filter element 3, the post-filter element inlet 31, the third reversing valve 103, and the drain pipeline 500 in sequence to achieve reverse hot flushing of the post-filter element 3 and active regeneration.

[0134] When the post-filter element 3 is soaked in the heat regeneration mode, it is only necessary to close the drain valve 5031 to allow hot water to flow into the post-filter element 3 according to the above flow path. When the liquid level detector detects that the hot water level in the post-filter element 3 reaches the preset level, the driving pump of the heating device 4 is turned off, and the post-filter element 3 is soaked in hot water. After soaking for a certain period of time, the drain valve 5031 is opened to drain the hot water.

[0135] In the heat regeneration mode, the temperature of the hot water can be detected by a temperature detector to adjust the heating power of the heating device 4 according to the hot water temperature, or water can be added to the heating device 4 through the pure water tank 5 to achieve the water temperature being controlled at a suitable temperature for heat regeneration;

[0136] When the pre-filter element 1 is cooled, Figure 5 As shown, Figure 5 The direction indicated by the medium thick line segment and the arrow is the flow direction of pure water during reverse cooling. The drain valve 5031 is opened, the first control valve 201 is closed, the first pipeline switching structure and the second pipeline switching structure are both switched to the second state, and the fourth reversing valve 401 connects the pure water tank water inlet 51 with the cooling pipeline 600. The pure water in the pure water tank 5 flows through the pure water tank water inlet 51, the fourth reversing valve 401, the cooling pipeline 600, the first regeneration pipeline 200, the second regeneration pipeline 300, the second reversing valve 102, the pre-filter outlet 12, the pre-filter 1, the pre-filter inlet 11, the first reversing valve 101, and the drain pipeline 500 in sequence to achieve flushing and cooling of the pre-filter 1;

[0137] When the post filter element 3 is cooled, Figure 6 As shown, Figure 6 The direction indicated by the medium thick line segment and the arrow is the flow direction of pure water during reverse cooling. The drain valve 5031 is opened, the first control valve 201 is closed, the second pipeline switching structure is switched to the first state, and the third pipeline switching structure is switched to the second state. The fourth reversing valve 401 connects the pure water tank inlet 51 and the rear water inlet pipeline. The pure water in the pure water tank 5 flows through the pure water tank inlet 51, the fourth reversing valve 401, the rear water outlet pipeline 400, the rear filter element outlet 32, the rear filter element 3, the rear filter element inlet 31, the third reversing valve 103, and the drain pipeline 500 in turn to achieve flushing and cooling of the rear filter element 3.

[0138] It should be noted that the usage process described above is the process of independently thermally regenerating and cooling the pre-filter element 1 and the post-filter element 3. In actual use, the pre-filter element 1 and the post-filter element 3 can also be thermally regenerated or cooled simultaneously by controlling the first control valve 201. This embodiment will not be repeated here.

[0139] On the other hand, this embodiment also provides a control method for a water purification system, comprising the following steps: when the water purification system executes a thermal regeneration mode, the control valve group controls hot water to flow through the heating water outlet 42, the first regeneration pipeline 200, the post-filter element water outlet 32, the post-filter element 3, the post-filter element water inlet 31 and the drainage pipeline 500 in sequence, thereby realizing reverse hot flushing of the post-filter element 3, and / or the control valve group controls hot water to flow through the heating water outlet 42, the second regeneration pipeline 300, the pre-filter element water outlet 12, the pre-filter element 1, the pre-filter element water inlet 11 and the drainage pipeline 500 in sequence, thereby realizing reverse hot flushing of the pre-filter element 1.

[0140] Since the control method of this embodiment is used to control the water purification system of this embodiment, the control method has the same technical effect as the water purification system of this embodiment, and will not be described in detail here.

[0141] Optionally, the water purification system enters thermal regeneration mode when the water purification volume reaches a preset volume, or when the lifespans of the pre-filter element 1 and the post-filter element 3 both reach preset lifespans. The water purification system may enter thermal regeneration mode based on the system's water purification volume or the lifespans of the pre-filter element 1 and the post-filter element 3, to promptly regenerate the pre-filter element 1 and the post-filter element 3 and ensure their service life.

[0142] In this embodiment, when the life of the pre-filter element 1 reaches the first preset life and the life of the post-filter element 3 has not reached the second preset life, the water purification system executes the thermal regeneration mode to only perform active regeneration on the pre-filter element 1. When the life of the pre-filter element 1 has not reached the first preset life and the life of the post-filter element 3 reaches the second preset life, the water purification system executes the thermal regeneration mode to only perform active regeneration on the post-filter element 3. The water purification system can also execute the thermal regeneration mode according to the respective service lives (i.e., the degree of contamination) of the pre-filter element 1 and the post-filter element 3, so as to achieve timely independent active regeneration of the pre-filter element 1 or the post-filter element 3, thereby ensuring the service lives of both.

[0143] It can be understood here that when the life of the pre-filter element 1 reaches the first preset life, it means that the pre-filter element 1 is heavily polluted and has basically lost its active adsorption capacity for tap water. When the life of the post-filter element 3 reaches the second preset life, it means that the post-filter element 3 is heavily polluted and has basically lost its active adsorption capacity for tap water. Therefore, the water purification system needs to execute the thermal regeneration mode to perform active regeneration on the pre-filter element 1 or the post-filter element 3.

[0144] Of course, the preset life, the first preset life, and the second preset life can all be set as needed, and are generally determined when the pre-filter element 1 and the post-filter element 3 are manufactured.

[0145] The water purification system's thermal regeneration mode includes: entering a reverse hot flush state, entering a soaking state, or alternating between reverse hot flushing and cooling modes. The thermal regeneration mode includes multiple regeneration modes, selectable based on specific needs, offering both selectability and adaptability.

[0146] In the control method of this embodiment, the temperature of the hot water is greater than the ambient temperature and less than the boiling point of water. By limiting the temperature of the hot water to an appropriate range, active regeneration of the pre-filter 1 and / or post-filter 3 at room temperature can be achieved while also avoiding excessive water consumption / hours when cooling the pre-filter 1 and / or post-filter 3 due to excessively high hot water temperatures, which would waste resources.

[0147] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A water purification system, characterized in that: include: A water production device comprises a water production pipeline (100) and a pre-filter element (1) and a post-filter element (3) sequentially connected to the water production pipeline (100); the pre-filter element (1) and the post-filter element (3) both comprise carbon water purification units; the pre-filter element (1) has a pre-filter element water inlet (11) and a pre-filter element water outlet (12); and the post-filter element (3) has a post-filter element water inlet (31) and a post-filter element water outlet (32); The heating device (4) has a heating water inlet (41) and a heating water outlet (42), and the heating water outlet (42) is connected to the water intake end; A reverse flushing pipeline comprises a first regeneration pipeline (200) connected in parallel between the heating water outlet (42) and the post-filter element water outlet (32), a second regeneration pipeline (300) connected in parallel between the heating water outlet (42) and the pre-filter element water outlet (12), and a drainage pipeline (500) respectively connected to the post-filter element water inlet (31) and the pre-filter element water inlet (11); a control valve group, arranged on the water production pipeline (100) and the backwash pipeline, adapted to control the water purification system to execute a heat regeneration mode, and to control hot water to flow sequentially through the heating water outlet (42), the first regeneration pipeline (200), the post-filter cartridge water outlet (32), the post-filter cartridge (3), the post-filter cartridge water inlet (31), and the drainage pipeline (500), and / or to flow sequentially through the heating water outlet (42), the second regeneration pipeline (300), the pre-filter cartridge water outlet (12), the pre-filter cartridge (1), the pre-filter cartridge water inlet (11), and the drainage pipeline (500); 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 control valve group further comprises: a second pipeline switching structure having a first state in which the water outlet (12) of the pre-filter element is connected to the water inlet (21) of the fine filter element, and a second state in which the water outlet (12) of the pre-filter element is connected to the second regeneration pipeline (300); when the water purification system is in water production mode, the second pipeline switching structure is in the first state; when the water purification system is in heat regeneration mode, the second pipeline switching structure is in the second state; and / or a third pipeline switching structure, having a first state of connecting the pure water port (23) with the post-filter cartridge water inlet (31) and a second state of connecting the post-filter cartridge water inlet (31) with the drainage pipeline (500); when the water purification system executes the water production mode, the third pipeline switching structure is in the first state; when the water purification system executes the heat regeneration mode, the third pipeline switching structure is in the second state.

2. The water purification system according to claim 1, characterized in that: The control valve group includes a first pipeline switching structure, the first pipeline switching structure having a first state in which the pre-filter element water inlet (11) is connected to the tap water inlet, and a second state in which the pre-filter element water inlet (11) is connected to the drainage pipeline (500). When the water purification system performs a water production mode, the first pipeline switching structure is in the first state, and when the water purification system performs a heat regeneration mode, the first pipeline switching structure is in the second state.

3. The water purification system according to claim 1, characterized in that: The control valve group further includes a fourth pipeline switching structure, wherein the fourth pipeline switching structure has a first state in which the post-filter element water outlet (32) is connected to the heating water inlet (41), and a second state in which the post-filter element water outlet (32) is connected to the first regeneration pipeline (200). When the water purification system executes the water production mode, the fourth pipeline switching structure is in the first state, and when the water purification system executes the thermal regeneration mode, the fourth pipeline switching structure is in the second state.

4. The water purification system according to claim 2, characterized in that: The first pipeline switching structure comprises a first reversing valve (101), a water inlet of the first reversing valve (101) being connected to the water inlet (11) of the pre-filter element, a first water outlet of the first reversing valve (101) being connected to the tap water inlet, and a second water outlet of the first reversing valve (101) being connected to the drainage pipeline (500); when the first pipeline switching structure is in the first state, the water inlet of the first reversing valve (101) is connected to the first water outlet of the first reversing valve (101); and when the first pipeline switching structure is in the second state, the water inlet of the first reversing valve (101) is connected to the second water outlet of the first reversing valve (101).

5. The water purification system according to claim 1, characterized in that: The second pipeline switching structure comprises a second reversing valve (102), the water inlet of the second reversing valve (102) is connected to the water outlet (12) of the pre-filter element, the first water outlet of the second reversing valve (102) is connected to the water inlet (21) of the fine filter element, and the second water outlet of the second reversing valve (102) is connected to the second regeneration pipeline (300). When the second pipeline switching structure is in the first state, the water inlet of the second reversing valve (102) is connected to the first water outlet of the second reversing valve (102), and when the second pipeline switching structure is in the second state, the water inlet of the second reversing valve (102) is connected to the second water outlet of the second reversing valve (102).

6. The water purification system according to claim 1, characterized in that: The third pipeline switching structure includes a third reversing valve (103), the water inlet of the third reversing valve (103) is connected to the water inlet (31) of the post-filter element, the first water outlet of the third reversing valve (103) is connected to the pure water port (23), and the second water outlet of the third reversing valve (103) is connected to the drainage pipeline (500). When the third pipeline switching structure is in the first state, the water inlet of the third reversing valve (103) is connected to the first water outlet of the third reversing valve (103); when the third pipeline switching structure is in the second state, the water inlet of the third reversing valve (103) is connected to the second water outlet of the third reversing valve (103).

7. The water purification system according to claim 3, characterized in that: The post-filter water outlet (32) is connected to the heating water inlet (41) via a post-water outlet pipeline (400); the fourth pipeline switching structure comprises a first control valve (201) provided on the first regeneration pipeline (200) and a second control valve provided on the post-water outlet pipeline (400); when the fourth pipeline switching structure is in the first state, the first control valve (201) is closed and the second control valve is opened; when the fourth pipeline switching structure is in the second state, the first control valve (201) is opened and the second control valve is closed.

8. The water purification system according to claim 7, characterized in that: The second regeneration pipeline (300) is connected to the first regeneration pipeline (200), and the connection between the second regeneration pipeline (300) and the first regeneration pipeline (200) is located upstream of the first control valve (201) along the hot water flow direction.

9. The water purification system according to claim 8, characterized in that: The water purification system further comprises a pure water tank (5), the pure water tank (5) being connected to both the rear water outlet pipe (400) and the second regeneration pipe (300). When the water purification system performs a cooling mode, the room-temperature pure water in the pure water tank (5) flows sequentially through the rear water outlet pipe (400), the rear filter element water outlet (32), the rear filter element (3), the rear filter element water inlet (31) and the drainage pipe (500), and / or flows sequentially through the second regeneration pipe (300), the pre-filter element water outlet (12), the pre-filter element (1), the pre-filter element water inlet (11) and the drainage pipe (500).

10. The water purification system according to claim 9, characterized in that: The pure water tank (5) has a pure water tank water inlet (51) and a pure water tank water outlet (52), wherein the pure water tank water inlet (51) is connected to the rear water outlet pipeline (400), and the pure water tank water outlet (52) is connected to the heating water inlet (41); The water purification system further comprises a cooling pipeline (600), one end of the cooling pipeline (600) being connected to the water inlet (51) of the pure water tank, and the other end of the cooling pipeline (600) being connected to the first regeneration pipeline (200), and the connection between the cooling pipeline (600) and the first regeneration pipeline (200) being located upstream of the connection between the second regeneration pipeline (300) and the first regeneration pipeline (200) along the flow direction of the hot water, and a first one-way valve (601) is provided on the cooling pipeline (600) for allowing only the pure water in the pure water tank (5) to flow from the cooling pipeline (600) to the first regeneration pipeline (200).

11. The water purification system according to claim 10, characterized in that: A second one-way valve (202) is provided on the first regeneration pipeline (200) for allowing only hot water to flow from the heating device (4) to the pre-filter element (1) and the post-filter element (3). The second one-way valve (202) is located upstream of the connection between the cooling pipeline (600) and the first regeneration pipeline (200).

12. The water purification system according to claim 10, characterized in that: One end of the cooling pipeline (600) away from the first regeneration pipeline (200) is connected to the rear water outlet pipeline (400); the second control valve is a fourth reversing valve (401); when the water purification system performs the water production mode, the fourth reversing valve (401) connects the pure water tank water inlet (51) with the rear water outlet pipeline (400); when the water purification system performs the cooling mode, the fourth reversing valve (401) connects the pure water tank water inlet (51) with the rear water outlet pipeline (400), or connects the pure water tank water inlet (51) with the cooling pipeline (600).

13. The water purification system according to claim 9, characterized in that: The water purification system has a working state of performing the heat regeneration mode and the cooling mode alternately.

14. The water purification system according to any one of claims 1 to 13, characterized in that: The drainage pipeline (500) comprises: A first drainage branch pipe (501) is connected to the water inlet (11) of the pre-filter element; A second drainage branch pipe (502) is connected to the water inlet (31) of the post-filter element; The main drainage pipeline (503) is connected to the drainage outlet. The main drainage pipeline (503) is connected to both the first drainage branch pipeline (501) and the second drainage branch pipeline (502). The main drainage pipeline (503) is provided with a drainage valve (5031).

15. The water purification system according to claim 14, characterized in that: The thermal regeneration mode also includes a soaking state. In the soaking state, the drain valve (5031) is closed, and the hot water in the heating device (4) is used to soak the pre-filter element (1) and / or the post-filter element (3).

16. The water purification system according to claim 1, 5 or 6, characterized in that: The wastewater outlet (22) is connected to a wastewater discharge pipeline (700), and a wastewater valve (701) is provided on the wastewater discharge pipeline (700).

17. The water purification system according to any one of claims 1 to 13, 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 heating device (4) by obtaining the liquid level of the pre-filter element (1) and / or the liquid level of the post-filter element (3).

18. The water purification system according to any one of claims 1 to 13, 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 device (4), and the temperature detector is suitable for obtaining the temperature value of the hot water so that the controller can adjust the heating power of the heating device (4) according to the temperature value.

19. The water purification system according to any one of claims 1 to 13, characterized in that: It also includes a coarse filter element (6), which is connected in series to the upstream of the pre-filter element (1) through the water production pipeline (100), and a booster pump (104) is provided on the water production pipeline (100) upstream of the coarse filter element (6).

20. A control method for a water purification system according to any one of claims 1 to 19, characterized in that: The following steps are involved: When the water purification system performs the heat regeneration mode, the control valve group controls the hot water to flow through the heating water outlet (42), the first regeneration pipeline (200), the post-filter outlet (32), the post-filter (3), the post-filter inlet (31) and the drainage pipeline (500) in sequence, thereby achieving reverse heat flushing of the post-filter (3). And / or the control valve group controls the hot water to flow sequentially through the heating water outlet (42), the second regeneration pipeline (300), the pre-filter outlet (12), the pre-filter (1), the pre-filter inlet (11) and the drainage pipeline (500), thereby achieving reverse hot flushing of the pre-filter (1).

21. The control method according to claim 20, characterized in that: When the purified water volume of the water purification system reaches a preset volume, or the service life of the pre-filter element (1) and the post-filter element (3) both reaches a preset service life, the water purification system executes the thermal regeneration mode.

22. The control method according to claim 20, characterized in that: When the life of the pre-filter element (1) reaches a first preset life and the life of the post-filter element (3) has not reached a second preset life, the water purification system executes the thermal regeneration mode to only perform active regeneration on the pre-filter element (1); when the life of the pre-filter element (1) has not reached the first preset life and the life of the post-filter element (3) reaches the second preset life, the water purification system executes the thermal regeneration mode to only perform active regeneration on the post-filter element (3).

23. The control method according to claim 21 or 22, characterized in that: The water purification system executing the thermal regeneration mode specifically includes: the water purification system executing the thermal regeneration mode to enter the reverse hot flushing state, or the water purification system executing the thermal regeneration mode to enter the soaking state, or the water purification system executing the reverse hot flushing state and the cooling mode in the thermal regeneration mode alternately.

24. The control method according to any one of claims 20 to 22, characterized in that: The temperature of the hot water is higher than the ambient temperature and lower than the boiling point of water.

Images