Water purification system and method of controlling the same

Abstract

The present application relates to the technical field of water purification, and discloses a water purification system and a control method thereof, which comprises a water production device, a heat regeneration device and a control valve group. The water production device comprises a pre-filter, a water storage unit and a heating unit connected in series to a water production pipeline. The pre-filter has a first water outlet and a first water inlet connected to the water storage unit. The heating unit has a heating water inlet and a heating water outlet connected to a boiling water outlet. The heat regeneration device comprises a heat exchange unit, a regeneration pipeline connected to the first water outlet and a drainage pipeline connected to the first water inlet. The heat exchange unit has a first heat exchange channel with two ends connected to the water storage unit and the heating water inlet, respectively, and a second heat exchange channel with two ends connected to the heating water outlet and the regeneration pipeline, respectively. The control valve group is arranged on the water production pipeline and the regeneration pipeline. The present application does not need to frequently adjust the heating power of the heating unit, and satisfies the user to directly use boiling water before and after the water purification system executes the heat regeneration mode, without waiting, thereby improving the user experience.

Description

Technical Field

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

[0002] Tap water inevitably contains contaminants such as rust, sediment, organic matter, and microorganisms during its transportation through pipe networks. Water purifiers with purification functions can effectively remove impurities from tap water. A typical water purifier system includes a pre-filter, a precision filter, and a post-treatment filter. The pre-filter removes organic matter, colloids, heavy metals, and sediment particles. The precision filter, such as a reverse osmosis membrane filter (RO filter), is extremely accurate and is the core treatment filter in the system. The post-treatment filter removes trace elements, adjusts pH, and improves the taste of the water.

[0003] The activated carbon component in the pre-filter can effectively remove oxidizing substances such as residual chlorine. Therefore, activated carbon is an indispensable and important component in the pre-filter. However, the activated carbon component in the pre-filter has a shorter lifespan compared to other filter elements, which leads to frequent replacement of the pre-filter, higher cost, and also limits 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 its control method to solve the problems of frequent replacement and high cost of pre-filters in the prior art.

[0005] The first aspect of this invention provides a water purification system, including a water production device, a thermal regeneration device, and a control valve assembly. The water production device includes a pre-filter, a water storage unit, and a heating unit connected in series to a water production pipeline. The pre-filter includes activated carbon and has a first inlet and a first outlet. The water storage unit is connected to the first outlet. The heating unit has a heating inlet and a heating outlet, and the heating outlet is connected to a boiling water intake. The thermal regeneration device includes a heat exchange unit, a regeneration pipeline, and a drainage pipeline. The heat exchange unit has a first heat exchange channel and a second heat exchange channel. The two ends of the first heat exchange channel are respectively connected to the water storage unit and the heating inlet. The two ends of the second heat exchange channel are respectively connected to the heating outlet and the regeneration pipeline. The regeneration pipeline is connected to the first outlet, and the drainage pipeline is connected to the first inlet. The control valve group is set in the water production pipeline and the regeneration pipeline. The control valve group can control the water purification system to execute the thermal regeneration mode and control the boiling water of the heating unit to flow into the second heat exchange channel and exchange heat with the room temperature water from the water storage unit in the first heat exchange channel to form a preset value of hot water. The hot water flows through the regeneration pipeline, the first outlet, the pre-filter, the first inlet, and the drainage pipeline to realize the reverse thermal flushing regeneration of the pre-filter.

[0006] Beneficial effects: Raw water (e.g., tap water) flows into the pre-filter cartridge through the water purification pipeline for filtration, achieving tap water purification. The water purification system can execute a heat regeneration mode based on usage conditions via a set heat regeneration device and control valve group. When the control valve group controls the water purification system to execute the heat regeneration mode, it can control the boiling water from the heating unit to flow into the second heat exchange channel and exchange heat with the room temperature water from the storage unit in the first heat exchange channel to form a preset value of hot water. The hot water flows through the regeneration pipeline and the first outlet into the pre-filter cartridge to achieve reverse heat flushing and regeneration of the pre-filter cartridge. The flushed hot water is discharged through the first inlet and the drain pipeline. The hot water of this application not only... The pre-filter has a rinsing effect and can also disrupt the balance between activated carbon and pollutant adsorbates, causing pollutants to desorb and desorb. This allows the activated carbon to regain some of its adsorption capacity, regenerating the pre-filter and extending its lifespan, reducing replacement frequency, and lowering costs. Simultaneously, the heat exchange unit cools the boiling water in the heating unit, ensuring uninterrupted hot water access. In other words, the heating unit's power does not need to be adjusted before and after the hot regeneration mode to maintain boiling point. Users can directly access boiling water before and after the hot regeneration mode without waiting, enhancing the user experience.

[0007] In some embodiments, the regeneration pipeline is connected to the water storage unit. After the thermal regeneration mode is completed, the control valve group controls the water purification system to execute the cooling mode and controls the room temperature water in the water storage unit to flow through the regeneration pipeline, the first outlet, the pre-filter, the first inlet, and the drain pipeline to rinse and cool the pre-filter.

[0008] Beneficial effects: After the hot regeneration mode ends, the control valve group controls the water purification system to execute the cooling mode, and controls the room temperature water in the water storage unit to flow through the regeneration pipeline and the first outlet into the pre-filter to achieve flushing and cooling of the pre-filter. The cooled water is discharged through the first inlet and the drain pipeline. Therefore, by controlling the water purification system to execute the cooling mode through the control valve group, the hot water remaining in the hot regeneration mode of the pre-filter can be quickly replaced, achieving rapid cooling of the pre-filter, reducing the user's waiting time for water, and at the same time preventing hot water from flowing into the downstream fine filter and causing damage to it and shortening its life.

[0009] In some embodiments, the control valve assembly includes a pipeline switching structure having a first state connecting the water storage unit to the first heat exchange channel and a second state connecting the water storage unit to the regeneration pipeline. When the water purification system executes the heat regeneration mode, the pipeline switching structure is in the first state, and when the water purification system executes the cooling mode, the pipeline switching structure is in the second state.

[0010] Beneficial effects: With the above setup, when the water purification system is in thermal regeneration mode, the pipeline switching structure is in the first state. The room temperature water from the storage unit flows into the first heat exchange channel through the pipeline switching structure and exchanges heat with the boiling water from the heating unit in the second heat exchange channel. The hot water after heat exchange flows into the pre-filter for thermal regeneration. When the water purification system is in cooling mode, the pipeline switching structure is in the second state. The room temperature water from the storage unit flows into the regeneration pipeline through the pipeline switching structure and then into the pre-filter for rinsing and cooling. Therefore, the pipeline switching structure switches the connection state of the storage unit to realize the switching of the water purification system between thermal regeneration mode and cooling mode.

[0011] In some embodiments, the pipeline switching structure includes a first solenoid valve and a second solenoid valve. The inlet of the first solenoid valve is connected to the water storage unit, and the outlet of the first solenoid valve is connected to the first heat exchange channel. The inlet of the second solenoid valve is connected to the water storage unit, and the outlet of the second solenoid valve is connected to the regeneration pipeline. When the pipeline switching structure is in the first state, the first solenoid valve is open. When the pipeline switching structure is in the second state, the second solenoid valve is open.

[0012] Beneficial effects: When the water purification system is in thermal regeneration mode, the pipeline switching structure is in the first state, the first solenoid valve is open and the second solenoid valve is closed. The room temperature water in the storage unit flows into the first heat exchange channel through the first solenoid valve and exchanges heat with the boiling water from the heating unit in the second heat exchange channel. The hot water after heat exchange flows into the pre-filter for thermal regeneration. When the water purification system is in cooling mode, the pipeline switching structure is in the second state, the second solenoid valve is open and the first solenoid valve is closed. The room temperature water in the storage unit flows into the regeneration pipeline through the second solenoid valve and then into the pre-filter for rinsing and cooling.

[0013] In some embodiments, the pipeline switching structure is a two-way valve, the inlet of the two-way valve is connected to the water storage unit, the first outlet of the two-way valve is connected to the first heat exchange channel, and the second outlet of the two-way valve is connected to the regeneration pipeline. When the pipeline switching structure is in the first state, the inlet of the two-way valve and the first outlet are connected. When the pipeline switching structure is in the second state, the inlet of the two-way valve and the second outlet are connected.

[0014] Beneficial effects: When the water purification system is in thermal regeneration mode, the pipeline switching structure is in the first state, the inlet and the first outlet of the two-way valve are connected, the room temperature water from the storage unit flows into the two-way valve through the inlet and out through the first outlet, then flows into the first heat exchange channel and exchanges heat with the boiling water from the heating unit in the second heat exchange channel. The hot water after heat exchange flows into the pre-filter for thermal regeneration. When the water purification system is in cooling mode, the pipeline switching structure is in the second state, the inlet and the second outlet of the two-way valve are connected, the room temperature water from the storage unit flows into the two-way valve through the inlet and out through the second outlet, flows through the regeneration pipeline and then flows into the pre-filter for rinsing and cooling.

[0015] In some embodiments, the control valve assembly further includes a drain valve disposed in the drain line and / or a regeneration valve disposed in the regeneration line.

[0016] Beneficial effects: The drain valve opens when drainage is needed and closes when the water purification system is purifying water to ensure the normal operation of the water purification system. The regeneration valve is used to control the opening and closing of the regeneration pipeline. The regeneration valve opens when the water purification system is in thermal regeneration mode and closes when the water purification system is purifying water.

[0017] In some embodiments, the water purification system further includes a temperature regulating device connected to the regeneration pipeline, the temperature regulating device being used to adjust the temperature of the hot water in the regeneration pipeline to reach the preset value.

[0018] Beneficial effects: Since the ambient water temperature of the water storage unit is constant (keeping it consistent with the environment), and the boiling water temperature of the heating unit is constant, the hot water after heat exchange in the heat exchange unit is generally at a specific temperature. Factors such as changes in ambient temperature may affect the hot water after heat exchange in the heat exchange unit, causing it to deviate from the preset value. Based on this, the temperature control device can be set to adjust the temperature of the hot water in the regeneration pipeline to reach the preset value, thereby ensuring the heat regeneration effect.

[0019] In some embodiments, the temperature control device includes a temperature control pipeline and a temperature control valve. The two ends of the temperature control pipeline are respectively connected to the heating unit and the regeneration pipeline. The temperature control valve is disposed on the temperature control pipeline and is used to open when the temperature of the hot water in the regeneration pipeline is lower than the preset value.

[0020] Beneficial effect: When the hot water after heat exchange in the heat exchange unit flows into the regeneration pipeline and the temperature of the hot water after heat exchange is lower than the preset value, the temperature regulating valve is opened so that the boiling water in the heating unit flows into the regeneration pipeline through the temperature regulating pipeline and mixes with the hot water therein, thereby raising the temperature of the hot water to reach the preset value.

[0021] In some embodiments, the pre-filter includes a first filtration unit, the first filtration unit includes the activated carbon component, the first inlet is connected to the inlet of the first filtration unit, and the first outlet is connected to the outlet of the first filtration unit.

[0022] Beneficial effects: With the above setup, the raw water (tap water) entering from the inlet flows into the first filter unit after passing through the first inlet. After being filtered by the first filter unit, it flows out through the first outlet, thus achieving primary filtration of the raw water and removing large particulate impurities from the raw water.

[0023] In some embodiments, the pre-filter has a second inlet and a second outlet. The pre-filter also includes a second filter unit that is independently configured with respect to the first filter unit. The second filter unit includes the activated carbon component. The second inlet is connected to the inlet of the second filter unit, the second outlet is connected to the outlet of the second filter unit, and the water storage unit is connected to the second outlet.

[0024] Beneficial effects: Pure water flows into the second filtration unit through the second inlet. The second filtration unit can filter the pure water again to remove trace elements, adjust the pH value and drinking taste. The filtered water flows to the water outlet through the second outlet for users to use and / or to the water storage unit for storage.

[0025] In some embodiments, the water purification device further includes a fine filter element, which has a fine filter element inlet and a pure water outlet. The fine filter element inlet is connected to the first water outlet, and the pure water outlet is connected to the second water inlet.

[0026] Beneficial effects: The fine filter cartridge can further filter the raw water after the first filtration unit. The filtered pure water flows into the second filtration unit through the pure water inlet and the second inlet for further filtration to ensure water quality.

[0027] In some embodiments, the water production device further includes a post-filter element disposed between the water storage unit and the heat exchange unit.

[0028] Beneficial effects: It can filter the purified water flowing out of the water storage unit again, preventing water quality changes due to prolonged water storage time and ensuring water quality.

[0029] A second aspect of the present invention provides a control method for a water purification system, wherein the control method is executed through the aforementioned water purification system, and the control method includes:

[0030] The water purification system is controlled to execute a hot regeneration mode by controlling the valve group, and the boiling water from the heating unit is controlled to flow into the second heat exchange channel and exchange heat with the room temperature water from the water storage unit in the first heat exchange channel to form a preset value of hot water. The hot water flows through the regeneration pipeline, the first outlet, the pre-filter, the first inlet and the drain pipeline to realize the reverse hot flushing regeneration of the pre-filter.

[0031] Beneficial effects: Since the control method of the water purification system of the present invention is executed by the water purification system of the present invention, it has the same technical effects as the water purification system, and will not be described in detail here.

[0032] In some embodiments, the control method of the water purification system further includes:

[0033] Upon completion of the thermal regeneration mode, the control valve group controls the water purification system to execute a cooling mode, and controls the ambient temperature water in the water storage unit to flow through the regeneration pipeline, the first outlet, the pre-filter, the first inlet, and the drain pipeline to rinse and cool the pre-filter.

[0034] Beneficial effects: After the hot regeneration mode ends, the control valve group controls the water purification system to execute the cooling mode. The room temperature water in the water storage unit flows through the regeneration pipeline and the first outlet into the pre-filter to achieve flushing and cooling of the pre-filter. The cooled water is discharged through the first inlet and the drain pipeline, thereby achieving rapid cooling of the pre-filter, reducing waiting time, and improving the working efficiency of the water purification system.

[0035] In some embodiments, if the duration of the thermal regeneration mode is T1 and the duration of the cooling mode is T2, then T1 > T2.

[0036] Beneficial effects: By reasonably setting the duration of the hot regeneration mode and the cooling mode, at least T1 > T2, the hot regeneration effect of the pre-filter can be ensured.

[0037] In some embodiments, T2 < 5 min.

[0038] Beneficial effects: By setting the duration of the cooling mode T2 to less than 5 minutes, the pre-filter can be cooled down while avoiding the waste of water resources. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 A schematic diagram of the overall connection structure of a water purification system according to an embodiment of the present invention is shown;

[0041] Figure 2 A schematic diagram of the overall connection structure of a water purification system according to another embodiment of the present invention is shown;

[0042] Figure 3 A schematic diagram of the overall connection structure of a water purification system according to another embodiment of the present invention is shown;

[0043] Figure 4 A schematic diagram of the overall connection structure of a water purification system according to another embodiment of the present invention is shown;

[0044] Figure 5 A schematic diagram of the structure of a pre-filter element according to an embodiment of the present invention is shown;

[0045] Figure 6 A schematic diagram of the structure of a fine filter element according to an embodiment of the present invention is shown;

[0046] Figure 7 A schematic diagram of water flow in a water purification system performing a thermal regeneration mode according to an embodiment of the present invention is shown.

[0047] Figure 8 This diagram illustrates the water flow during a cooling mode in a water purification system according to an embodiment of the present invention.

[0048] Figure 9 A schematic diagram of water flow in a water purification system performing a thermal regeneration mode according to another embodiment of the present invention is shown;

[0049] Figure 10 A schematic diagram of water flow is shown in the water purification system performing a cooling mode according to another embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Pre-filter; 11. First filtration unit; 111. First inlet; 112. First outlet; 12. Second filtration unit; 121. Second inlet; 122. Second outlet; 2. Fine filter; 21. Fine filter inlet; 22. Pure water outlet; 23. Wastewater outlet; 3. Water storage unit; 4. Post-filter; 5. Heat exchange unit; 6. Heating unit; 61. Heating inlet; 62. Heating outlet;

[0052] 100. Water production pipeline; 101. First solenoid valve; 102. Second solenoid valve; 103. Two-way valve; 1031. Water inlet; 1032. First outlet; 1033. Second outlet; 104. First inlet valve; 105. Second inlet valve; 106. Pressure stabilizing pump; 107. Boiling water inlet; 108. Warm water inlet; 200. Regeneration pipeline; 201. Regeneration valve; 202. Check valve; 300. Drainage pipeline; 301. Drainage valve; 400. Temperature control pipeline; 401. Temperature control valve; 500. Wastewater pipeline; 501. Wastewater valve. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] The following is combined with Figures 1 to 10 The following describes embodiments of the present invention.

[0055] According to an embodiment of the present invention, a water purification system is provided, comprising a water production device, a thermal regeneration device, and a control valve assembly. The water production device includes a pre-filter 1, a water storage unit 3, and a heating unit 6 connected in series to a water production pipeline 100. The pre-filter 1 includes activated carbon and has a first inlet 111 and a first outlet 112. The water storage unit 3 and the first outlet 112 are connected. The heating unit 6 has a heating inlet 61 and a heating outlet 62, with the heating outlet 62 connected to a hot water intake. The thermal regeneration device includes a heat exchange unit 5, a regeneration pipeline 200, and a drainage pipeline 300. The heat exchange unit 5 has a first heat exchange channel and a second heat exchange channel, with the two ends of the first heat exchange channel respectively connected to… The water storage unit 3 is connected to the heating inlet 61. The two ends of the second heat exchange channel are connected to the heating outlet 62 and the regeneration pipeline 200, respectively. The regeneration pipeline 200 is connected to the first outlet 112. The drain pipeline 300 is connected to the first inlet 111. The control valve group is set in the water production pipeline 100 and the regeneration pipeline 200. The control valve group can control the water purification system to execute the hot regeneration mode and control the boiling water from the heating unit 6 to flow into the second heat exchange channel and exchange heat with the room temperature water from the water storage unit 3 in the first heat exchange channel to form a preset value of hot water. The hot water flows through the regeneration pipeline 200, the first outlet 112, the pre-filter 1, the first inlet 111 and the drain pipeline 300 to realize the reverse hot flushing regeneration of the pre-filter 1.

[0056] In this embodiment of the water purification system, raw water (e.g., tap water) flows into the pre-filter cartridge 1 through the water production pipeline 100 for filtration, achieving tap water purification. The system can execute a heat regeneration mode based on usage conditions via a heat regeneration device and control valve assembly. When the control valve assembly controls the system to execute the heat regeneration mode, it controls the boiling water from the heating unit 6 to flow into the second heat exchange channel and exchange heat with the room-temperature water from the storage unit 3 in the first heat exchange channel to form a preset value of hot water. The hot water flows through the regeneration pipeline 200 and the first outlet 112 into the pre-filter cartridge 1 to achieve reverse heat flushing and regeneration of the pre-filter cartridge 1. The flushed hot water is discharged through the first inlet 111 and the drain pipeline 300. Water not only rinses the pre-filter 1, but also disrupts the balance between activated carbon and pollutant adsorbates, causing pollutants to desorb and desorb. This allows the activated carbon to regain some of its adsorption capacity, regenerating the pre-filter 1, thus extending its lifespan, reducing its replacement frequency, and lowering costs. Simultaneously, the heat exchange unit 5 cools the boiling water in the heating unit 6, ensuring that the hot water supply of the water purification system is not affected. In other words, the heating power of the heating unit 6 does not need to be adjusted before and after the water purification system enters the hot regeneration mode, so that the heating unit 6 remains at the same power for heating boiling water. Users can directly take boiling water from the boiling water outlet 107 before and after the hot regeneration mode without waiting, improving the user experience.

[0057] like Figures 1 to 4 As shown, the water production pipeline 100 is connected to the raw water inlet, which is generally tap water, to purify the tap water. A first inlet valve 104 is installed on the water production pipeline 100 upstream of the pre-filter 1 to facilitate the control of the flow of tap water.

[0058] like Figure 1 , Figure 3 and Figure 5 As shown, in some embodiments, the pre-filter 1 includes a first filter unit 11, the first filter unit 11 includes activated carbon components, a first inlet 111 is connected to the inlet of the first filter unit 11, and a first outlet 112 is connected to the outlet of the first filter unit 11.

[0059] With the above configuration, the raw water (tap water) entering from the inlet flows into the first filter unit 11 after passing through the first inlet 111. After being filtered by the first filter unit 11, it flows out through the first outlet 112, thus achieving primary filtration of the raw water and removing large particulate impurities from the raw water.

[0060] For example, the first filtration unit 11 can be a filter element made of PP cotton, activated carbon, and ultrafiltration, which can adsorb impurities such as silt in the raw water and remove residual chlorine in the raw water, thus achieving coarse filtration of the raw water.

[0061] In some embodiments, the pre-filter 1 has a second inlet 121 and a second outlet 122. The pre-filter 1 also includes a second filter unit 12 that is independently disposed from the first filter unit 11. The second filter unit 12 includes activated carbon components. The second inlet 121 is connected to the inlet of the second filter unit 12, the second outlet 122 is connected to the outlet of the second filter unit 12, and the water storage unit 3 is connected to the second outlet 122.

[0062] Pure water flows into the second filtration unit 12 through the second inlet 121. The second filtration unit 12 can filter the pure water again to remove trace elements, adjust the pH value and drinking taste. The filtered water flows to the water intake end through the second outlet 122 for users to use and / or flows to the water storage unit 3 for storage.

[0063] For example, the second filter unit 12 may be a filter cartridge containing activated carbon.

[0064] Specifically, the pre-filter 1 has a filter housing, and the first inlet 111, the first outlet 112, the second inlet 121 and the second outlet 122 are all set on the filter housing. The first filter unit 11 and the second filter unit 12 are independently set in the filter housing. By integrating the first filter unit 11 and the second filter unit 12 into the same filter housing, there is no need to set up a separate post-filter 4 structure, thereby simplifying the device structure and making the whole machine more compact and smaller in size.

[0065] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, in some embodiments, the water purification device further includes a fine filter element 2, which has a fine filter element inlet 21 and a pure water outlet 22. The fine filter element inlet 21 is connected to the first water outlet 112, and the pure water outlet 22 is connected to the second water inlet 121.

[0066] The fine filter element 2 can finely filter the raw water filtered by the first filter unit 11. The filtered pure water flows into the second filter unit 12 through the pure water inlet 22 and the second water inlet 121 for further filtration to ensure water quality.

[0067] The fine filter element 2 has a higher filtration accuracy than the pre-filter element 1. The fine filter element 2 is located downstream of the first filter unit 11 and can further purify the raw water filtered by the first filter unit 11 with high precision. It is the core processing filter element of the water making device.

[0068] In specific forms, for example, the fine filter element 2 can be a reverse osmosis membrane filter element (RO filter element), a nanofiltration membrane filter element, etc., depending on the filtration requirements. This embodiment does not make specific limitations.

[0069] Because the particle size of the fine filter element 2 is very small, the resistance of the raw water is relatively large. Therefore, a pressure stabilizing pump 106 is installed on the water production pipeline 100 connecting the first filtration unit 11 and the fine filter element 2 to pressurize the raw water so that it can pass through the fine filter element 2 and improve the filtration efficiency.

[0070] In some embodiments, a second inlet valve 105 is also provided on the water supply pipeline 100 connecting the first filter unit 11 and the fine filter element 2. The second inlet valve 105 is located upstream of the pressure stabilizing pump 106.

[0071] The second inlet valve 105 can control and regulate the raw water flowing to the fine filter element 2, and can also cut off the water production pipeline 100 when the water purification system stops working, so as to prevent the raw water from continuing to flow into the fine filter element 2 and causing damage to the filter element.

[0072] As shown in the figure, in some embodiments, the fine filter element 2 also has a wastewater outlet 23, and the water making device also includes a wastewater pipeline 500, which is connected to the wastewater outlet 23.

[0073] When the fine filter element 2 is used for filtration, it will generate corresponding wastewater. The wastewater flows into the wastewater pipe 500 through the wastewater outlet 23 and is discharged to the outside through the wastewater pipe 500.

[0074] Wastewater valve 501 is installed on wastewater pipeline 500 to control the connection or disconnection of wastewater pipeline 500.

[0075] Of course, in other embodiments, such as Figure 2 or Figure 4 As shown, the pre-filter 1 can also be equipped with only the first filter unit 11 and without the second filter unit 12. A post-filter 4 can be installed on the water production pipeline 100 downstream of the water storage unit 3 or the fine filter 2. The post-filter 4 can be used to filter the water flowing out of the water storage unit 3 and the fine filter 2 again, which can also ensure water quality.

[0076] The water storage unit 3 is used to store filtered water for easy access by users and to avoid the water purifier from running for a long time.

[0077] The water storage unit 3 is a device with its own water discharge driving force. For example, it can be a pressure tank or a water storage device with a self-priming pump or a water pump.

[0078] Heating unit 6 can heat purified water to boiling. For example, heating unit 6 can be a hot water tank or a water storage device with a built-in heating element.

[0079] The heat exchange unit 5 can be a heat exchanger. During heat exchange, the boiling water from the heating unit 6 flows into the second heat exchange channel, and the room temperature water from the water storage unit 3 flows into the first heat exchange channel. The heat from the boiling water is transferred to the room temperature water in the first heat exchange channel through radiation, thereby converting the boiling water into hot water of a preset value.

[0080] It should be noted that the preset value can be set according to the hot water temperature required for the thermal regeneration mode. The preset value can be a specific temperature value or a temperature range value. For example, the preset value can be 36℃ to 40℃, but it is not limited to this.

[0081] The regeneration pipeline 200 is used for the cooled hot water to flow to the pre-filter cartridge 1 for thermal regeneration. Specifically, the regeneration pipeline 200 can be sealed to the first outlet 112, or it can be connected to the water supply pipeline 100 between the first filter unit 11 and the fine filter cartridge 2. It should be noted that when the regeneration pipeline 200 is connected to the water supply pipeline 100 between the first filter unit 11 and the fine filter cartridge 2, its connection point is located upstream of the second inlet valve 105 to prevent the hot water in the regeneration pipeline 200 from flowing back to the fine filter cartridge 2 and causing damage.

[0082] In some embodiments, a regeneration valve 201 is provided on the regeneration pipeline 200. The regeneration valve 201 is used to control the opening and closing of the regeneration pipeline 200. The regeneration valve 201 is opened when the water purification system is in thermal regeneration mode and closed when the water purification system is working.

[0083] In some embodiments, a check valve 202 is also provided on the regeneration pipeline 200. The check valve 202 is located downstream of the regeneration valve 201. The check valve 202 can allow hot water in the regeneration pipeline 200 to flow to the pre-filter 1 while blocking the raw water flowing out of the pre-filter 1 to prevent it from flowing back to the regeneration pipeline 200.

[0084] In some embodiments, the water making device further includes a warm water inlet 108, which is connected to the outlet of the second heat exchange channel. When warm water is needed, the warm water inlet 108 is opened, and the boiling water in the heating unit 6 flows into the second heat exchange channel and exchanges heat with the room temperature water in the first heat exchange channel to form hot water at a lower temperature. The hot water flows from the outlet of the second heat exchange channel to the warm water inlet 108 for the user to use.

[0085] Specifically, in this embodiment, the warm water inlet 108 can be connected to the warm water intake pipeline and the regeneration pipeline 200, and the connection is located upstream of the regeneration valve 201. When warm water is needed, the regeneration valve 201 is closed, and the hot water generated by the heat exchange in the second heat exchange channel flows sequentially through the regeneration pipeline 200 and the warm water intake pipeline to the warm water inlet 108.

[0086] The drain pipe 300 is used to drain the hot water after rinsing the pre-filter 1, so that the hot water used to rinse the pre-filter 1 remains in a flowing state to ensure the heat regeneration effect of the pre-filter 1.

[0087] The drain pipe 300 can be sealed to the first water inlet 111, or the drain pipe 300 can be connected to the water production pipe 100 upstream of the pre-filter 1. It should be noted that when the drain pipe 300 is connected to the water production pipe 100 upstream of the pre-filter 1, its connection point is located downstream of the first water inlet valve 104. When the first water inlet valve 104 is closed, it can also prevent tap water from flowing into the drain pipe 300.

[0088] In some embodiments, the drain pipe 300 is provided with a drain valve 301, which opens when drainage is needed and closes when the water purification system is purifying water, so as to ensure the normal operation of the water purification system.

[0089] After the hot regeneration mode is executed, the temperature inside the pre-filter 1 is high. In order to protect the downstream components that are not resistant to high temperatures (such as the fine filter 2), the pre-filter 1 needs to be cooled. In some embodiments, the regeneration pipeline 200 is connected to the water storage unit 3. When the hot regeneration mode is completed, the control valve group controls the water purification system to execute the cooling mode, and controls the room temperature water in the water storage unit 3 to flow through the regeneration pipeline 200, the first outlet 112, the pre-filter 1, the first inlet 111, and the drain pipeline 300 to rinse and cool the pre-filter 1.

[0090] After the hot regeneration mode ends, the control valve group controls the water purification system to execute the cooling mode, and controls the room temperature water in the water storage unit 3 to flow through the regeneration pipeline 200 and the first outlet 112 into the pre-filter 1 to achieve flushing and cooling of the pre-filter 1. The cooled water is discharged through the first inlet 111 and the drain pipeline 300. Therefore, by controlling the water purification system to execute the cooling mode through the control valve group, the hot water remaining in the hot regeneration mode of the pre-filter 1 can be quickly replaced, achieving rapid cooling of the pre-filter 1, reducing the user's waiting time for water, and at the same time preventing hot water from flowing into the downstream fine filter 2, causing damage to it and shortening its life.

[0091] In some embodiments, the control valve assembly includes a pipeline switching structure, which has a first state connecting the water storage unit 3 to the first heat exchange channel and a second state connecting the water storage unit 3 to the regeneration pipeline 200. When the water purification system executes a heat regeneration mode, the pipeline switching structure is in the first state, and when the water purification system executes a cooling mode, the pipeline switching structure is in the second state.

[0092] In the above configuration, when the water purification system is in the hot regeneration mode, the pipeline switching structure is in the first state. The room temperature water in the water storage unit 3 flows into the first heat exchange channel through the pipeline switching structure and exchanges heat with the boiling water from the heating unit 6 in the second heat exchange channel. The hot water after heat exchange flows into the pre-filter 1 for hot regeneration. When the water purification system is in the cooling mode, the pipeline switching structure is in the second state. The room temperature water in the water storage unit 3 flows into the regeneration pipeline 200 through the pipeline switching structure and then into the pre-filter 1 for rinsing and cooling. Therefore, the pipeline switching structure switches the connection state of the water storage unit 3 to realize the switching between the hot regeneration mode and the cooling mode of the water purification system.

[0093] like Figure 1 or Figure 2 As shown, in some embodiments, the pipeline switching structure includes a first solenoid valve 101 and a second solenoid valve 102. The inlet of the first solenoid valve 101 is connected to the water storage unit 3, and the outlet of the first solenoid valve 101 is connected to the first heat exchange channel. The inlet of the second solenoid valve 102 is connected to the water storage unit 3, and the outlet of the second solenoid valve 102 is connected to the regeneration pipeline 200. When the pipeline switching structure is in the first state, the first solenoid valve 101 is open. When the pipeline switching structure is in the second state, the second solenoid valve 102 is open.

[0094] When the water purification system is in thermal regeneration mode, the pipeline switching structure is in the first state, the first solenoid valve 101 is open and the second solenoid valve 102 is closed. The room temperature water in the water storage unit 3 flows into the first heat exchange channel through the first solenoid valve 101 and exchanges heat with the boiling water from the heating unit 6 in the second heat exchange channel. The hot water after heat exchange flows into the pre-filter 1 for thermal regeneration. When the water purification system is in cooling mode, the pipeline switching structure is in the second state, the second solenoid valve 102 is open and the first solenoid valve 101 is closed. The room temperature water in the water storage unit 3 flows into the regeneration pipeline 200 through the second solenoid valve 102 and then into the pre-filter 1 for rinsing and cooling.

[0095] like Figure 3 or Figure 4 As shown, in some other embodiments, the pipeline switching structure is a two-way valve 103. The inlet 1031 of the two-way valve 103 is connected to the water storage unit 3, the first outlet 1032 of the two-way valve 103 is connected to the first heat exchange channel, and the second outlet 1033 of the two-way valve 103 is connected to the regeneration pipeline 200. When the pipeline switching structure is in the first state, the inlet 1031 and the first outlet 1032 of the two-way valve 103 are connected. When the pipeline switching structure is in the second state, the inlet 1031 and the second outlet 1033 of the two-way valve 103 are connected.

[0096] When the water purification system is in the hot regeneration mode, the pipeline switching structure is in the first state. The inlet 1031 and the first outlet 1032 of the two-way valve 103 are connected. The room temperature water from the water storage unit 3 flows into the two-way valve 103 through the inlet 1031 and flows out through the first outlet 1032 before flowing into the first heat exchange channel and exchanging heat with the boiling water from the heating unit 6 in the second heat exchange channel. The hot water after heat exchange flows into the pre-filter 1 for hot regeneration. When the water purification system is in the cooling mode, the pipeline switching structure is in the second state. The inlet 1031 and the second outlet 1033 of the two-way valve 103 are connected. The room temperature water from the water storage unit 3 flows into the two-way valve 103 through the inlet 1031 and flows out through the second outlet 1033 before flowing through the regeneration pipeline 200 and into the pre-filter 1 for rinsing and cooling.

[0097] In addition to the above-described configuration, in some embodiments, the control valve assembly further includes a drain valve 301 disposed in the drain line 300 and / or a regeneration valve 201 disposed in the regeneration line 200, as detailed above.

[0098] Since the ambient water temperature of the water storage unit 3 is constant (keeping pace with the environment), and the boiling water temperature of the heating unit 6 is constant, the hot water after heat exchange in the heat exchange unit 5 is generally at a specific temperature. Factors such as changes in ambient temperature may affect the hot water after heat exchange in the heat exchange unit 5, causing it to deviate from the preset value. Based on this, in some embodiments, the water purification system also includes a temperature regulating device, which is connected to the regeneration pipeline 200. The temperature regulating device is used to adjust the temperature of the hot water in the regeneration pipeline 200 to reach the preset value.

[0099] like Figures 1 to 4 As shown, in some embodiments, the temperature control device includes a temperature control pipeline 400 and a temperature control valve 401. The two ends of the temperature control pipeline 400 are respectively connected to the heating unit 6 and the regeneration pipeline 200. The temperature control valve 401 is installed on the temperature control pipeline 400 and is used to open when the temperature of the hot water in the regeneration pipeline 200 is lower than a preset value.

[0100] When the hot water after heat exchange in heat exchange unit 5 flows into regeneration pipe 200 and the temperature of the hot water after heat exchange is lower than the preset value, the temperature regulating valve 401 is opened so that the boiling water in heating unit 6 flows into regeneration pipe 200 through temperature regulating pipe 400 and mixes with the hot water in it, so as to raise the temperature of the hot water to reach the preset value.

[0101] Specifically, a temperature sensor can be installed in the regeneration pipeline 200 to detect the real-time temperature of the hot water, so as to facilitate the control of the opening and closing of the temperature regulating valve 401.

[0102] In this embodiment, to save on piping setup, the temperature regulating pipe 400 is connected to the pipe connecting the heating outlet 62 and the second heat exchange channel. Thus, when the temperature regulating valve 401 is opened, a portion of the boiling water in the pipe connecting the heating outlet 62 and the second heat exchange channel flows through the temperature regulating pipe 400 into the regeneration pipe 200 to heat the hot water therein.

[0103] In this embodiment, to facilitate the adjustment of the outlet water temperature of the warm water inlet 108, the connection point of the temperature regulating pipeline 400 and the regeneration pipeline 200 is located upstream of the connection point of the warm water inlet pipeline and the regeneration pipeline 200. The temperature of the warm water inlet 108 is adjusted by adjusting the mixing ratio of boiling water and heat-exchanged hot water through the temperature regulating valve 401, so as to meet the user's drinking water needs for different temperatures.

[0104] like Figure 1 or Figure 3As shown, in the case where the pre-filter 1 includes a first filter unit 11 and a second filter unit 12, although the water storage unit 3 stores purified water, its water quality will change if the storage time is too long, for example, sedimentation will occur. Based on this, in some embodiments, the water making device also includes a post-filter 4, which is disposed between the water storage unit 3 and the heat exchange unit 5, and can filter the purified water flowing out of the water storage unit 3 again to improve the water quality.

[0105] The boiling water inlet 107 is used to take boiling water heated by the heating unit 6. The boiling water inlet 107 can be connected to the pipeline between the heating outlet 62 and the second heat exchange channel. When hot water is taken, the boiling water flows from the heating unit 6 through the pipeline between the heating outlet 62 and the second heat exchange channel to the boiling water inlet 107.

[0106] The water purification system also includes a boiling water inlet 107, which is connected to the regeneration pipeline 200 and the connection is located upstream of the regeneration valve 201. When hot water is needed, the purified water from the water storage unit 3 or the water production pipeline 100 flows into the regeneration pipeline 200 through the pipeline switching structure and then flows to the boiling water inlet 107.

[0107] It should be noted that before the hot regeneration mode and the cooling mode are executed, the water storage unit 3 should be filled with water during the water purification system, and the heating unit 6 should have heated the water to boiling and be in a heat preservation state so that there is enough boiling water and room temperature water when the hot regeneration mode and the cooling mode are executed.

[0108] To facilitate understanding of the water purification system in this embodiment, its working process is described below:

[0109] Among them, with Figure 7 , Figure 8 The following describes the case where the pre-filter 1 of the water purification system includes a first filter unit 11 and a second filter unit 12, and the pipeline switching structure includes a first solenoid valve 101 and a second solenoid valve 102:

[0110] When the water purification system is in the hot regeneration mode, the pipeline switching structure is in the first state. The first solenoid valve 101, regeneration valve 201, and drain valve 301 are all open, while the second solenoid valve 102, first inlet valve 104, second inlet valve 105, and pressure stabilizing pump 106 are all closed. The room temperature water in the water storage unit 3 flows into the first heat exchange channel through the first solenoid valve 101 and exchanges heat with the boiling water from the heating unit 6 in the second heat exchange channel. If the temperature of the hot water after heat exchange is lower than the preset value, the temperature regulating valve 401 is opened, and the boiling water flows into the regeneration pipeline 200 through the temperature regulating pipeline 400 to mix and heat the hot water. The hot water that reaches the preset value flows through the regeneration pipeline 200 and the first outlet 112 into the pre-filter 1 to perform hot flushing and regeneration on the pre-filter 1. The flushed hot water flows into the drain pipeline 300 through the first inlet 111 and is discharged.

[0111] The water purification system is in cooling mode, and the pipeline switching structure is in the second state. The second solenoid valve 102, regeneration valve 201, and drain valve 301 are all open, while the first solenoid valve 101, first inlet valve 104, second inlet valve 105, and pressure stabilizing pump 106 are all closed. The room temperature water in the water storage unit 3 flows into the regeneration pipeline 200 through the second solenoid valve 102 and then into the pre-filter 1 through the regeneration pipeline 200 to flush and cool the pre-filter 1. The cooled water is discharged through the first inlet 111 and the drain pipeline 300.

[0112] Among them, with Figure 9 , Figure 10 The following describes the case where the pre-filter 1 of the water purification system includes only the first filter unit 11 and does not include the second filter unit 12, and a post-filter 4 is installed downstream of the water storage unit 3, and the pipeline switching structure is a two-way valve 103:

[0113] When the water purification system is in the hot regeneration mode, the pipeline switching structure is in the first state. The inlet 1031 and the first outlet 1032 of the two-way valve 103 are connected. The regeneration valve 201 and the drain valve 301 are both open, and the first inlet valve 104, the second inlet valve 105 and the pressure stabilizing pump 106 are all closed. The room temperature water in the water storage unit 3 flows into the first heat exchange channel through the inlet 1031 and the first outlet 1032 and exchanges heat with the boiling water from the heating unit 6 in the second heat exchange channel. If the temperature of the hot water after heat exchange is lower than the preset value, the temperature regulating valve 401 is opened. The boiling water flows into the regeneration pipeline 200 through the temperature regulating pipeline 400 to mix and heat the hot water. The hot water that reaches the preset value flows through the regeneration pipeline 200 and the first outlet 112 into the pre-filter 1 to perform hot flushing and regeneration on the pre-filter 1. The flushed hot water flows into the drain pipeline 300 through the first inlet 111 and is discharged.

[0114] The water purification system is in cooling mode, and the pipeline switching structure is in the second state. The inlet 1031 and the second outlet 1033 of the two-way valve 103 are connected. The regeneration valve 201 and the drain valve 301 are both open, and the first inlet valve 104, the second inlet valve 105 and the pressure stabilizing pump 106 are all closed. The room temperature water in the water storage unit 3 flows into the regeneration pipeline 200 through the inlet 1031 and the second outlet 1033 and then into the pre-filter 1 to rinse and cool the pre-filter 1. The cooled water is discharged through the first inlet 111 and the drain pipeline 300.

[0115] According to an embodiment of the present invention, in a second aspect, a control method for a water purification system is provided. The control method for the water purification system is executed through the aforementioned water purification system, and the control method for the water purification system includes:

[0116] The water purification system is controlled to execute the hot regeneration mode by controlling the valve group, and the boiling water from the heating unit 6 is controlled to flow into the second heat exchange channel and exchange heat with the room temperature water from the water storage unit 3 in the first heat exchange channel to form a preset value of hot water. The hot water flows through the regeneration pipeline 200, the first outlet 112, the pre-filter 1, the first inlet 111 and the drain pipeline 300 to realize the reverse hot flushing regeneration of the pre-filter 1.

[0117] Since the control method of the water purification system in this embodiment is executed by the water purification system in this embodiment, it has the same technical effect as the water purification system, and will not be described again in this embodiment.

[0118] In some embodiments, the control method of the water purification system further includes: according to the end of the thermal regeneration mode, controlling the water purification system to execute the cooling mode through the control valve group, and controlling the room temperature water in the water storage unit 3 to flow through the regeneration pipeline 200, the first outlet 112, the pre-filter 1, the first inlet 111 and the drain pipeline 300 to achieve rinsing and cooling of the pre-filter 1.

[0119] After the hot regeneration mode ends, the control valve group controls the water purification system to execute the cooling mode. The room temperature water in the water storage unit 3 flows through the regeneration pipeline 200 and the first outlet 112 into the pre-filter 1 to achieve flushing and cooling of the pre-filter 1. The cooled water is discharged through the first inlet 111 and the drain pipeline 300, thereby achieving rapid cooling of the pre-filter 1, reducing waiting time, and improving the working efficiency of the water purification system.

[0120] In some embodiments, if the duration of the thermal regeneration mode is T1 and the duration of the cooling mode is T2, then T1 > T2.

[0121] By reasonably setting the duration of the hot regeneration mode and the duration of the cooling mode, at least T1 > T2, the hot regeneration effect of the pre-filter 1 can be ensured.

[0122] In some embodiments, T2 < 5 min.

[0123] By setting the cooling mode duration T2 to less than 5 minutes, the pre-filter 1 can be cooled down while avoiding the waste of water resources.

[0124] The specific value of T2 can be 4 min, 3 min, or 2 min, etc., and the specific value of T1 can be 5 min, 6 min, or 7 min, etc. This embodiment does not impose specific restrictions.

[0125] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A water purification system, characterized in that, include: The water production device includes a pre-filter (1), a water storage unit (3), and a heating unit (6) installed in a water production pipeline (100). The pre-filter (1) includes activated carbon components and has a first inlet (111) and a first outlet (112). The water storage unit (3) is connected to the first outlet (112). The heating unit (6) has a heating inlet (61) and a heating outlet (62). The heating outlet (62) is connected to a boiling water outlet (107). The heat regeneration device includes a heat exchange unit (5), a regeneration pipeline (200), and a drainage pipeline (300). The heat exchange unit (5) has a first heat exchange channel and a second heat exchange channel. The two ends of the first heat exchange channel are respectively connected to the water storage unit (3) and the heating inlet (61). The two ends of the second heat exchange channel are respectively connected to the heating outlet (62) and the regeneration pipeline (200). The regeneration pipeline (200) is connected to the first outlet (112). The drainage pipeline (300) is connected to the first inlet (111). A control valve assembly is provided in the water production pipeline (100) and the regeneration pipeline (200). The control valve assembly can control the water purification system to perform a hot regeneration mode and control the boiling water of the heating unit (6) to flow into the second heat exchange channel and exchange heat with the room temperature water from the water storage unit (3) in the first heat exchange channel to form a preset value of hot water. The hot water flows through the regeneration pipeline (200), the first outlet (112), the pre-filter (1), the first inlet (111), and the drain pipeline (300) to realize the reverse hot flushing regeneration of the pre-filter (1). A temperature regulating device is connected to the regeneration pipeline (200). The temperature regulating device is used to adjust the temperature of the hot water in the regeneration pipeline (200) to reach the preset value. The temperature regulating device includes a temperature regulating pipeline (400) and a temperature regulating valve (401). The two ends of the temperature regulating pipeline (400) are respectively connected to the heating unit (6) and the regeneration pipeline (200). The temperature regulating valve (401) is installed on the temperature regulating pipeline (400). The temperature regulating valve (401) is used to open when the temperature of the hot water in the regeneration pipeline (200) is lower than the preset value. The connection between the temperature regulating pipeline (400) and the regeneration pipeline (200) is located upstream of the connection between the warm water intake pipeline and the regeneration pipeline (200).

2. The water purification system according to claim 1, characterized in that, The regeneration pipeline (200) is connected to the water storage unit (3). After the thermal regeneration mode is completed, the control valve group controls the water purification system to execute the cooling mode and controls the room temperature water in the water storage unit (3) to flow through the regeneration pipeline (200), the first outlet (112), the pre-filter (1), the first inlet (111), and the drain pipeline (300) to achieve rinsing and cooling of the pre-filter (1).

3. The water purification system according to claim 2, characterized in that, The control valve group includes a pipeline switching structure, which has a first state connecting the water storage unit (3) to the first heat exchange channel and a second state connecting the water storage unit (3) to the regeneration pipeline (200). When the water purification system executes the heat regeneration mode, the pipeline switching structure is in the first state. When the water purification system executes the cooling mode, the pipeline switching structure is in the second state.

4. The water purification system according to claim 3, characterized in that, The pipeline switching structure includes a first solenoid valve (101) and a second solenoid valve (102). The inlet of the first solenoid valve (101) is connected to the water storage unit (3), and the outlet of the first solenoid valve (101) is connected to the first heat exchange channel. The inlet of the second solenoid valve (102) is connected to the water storage unit (3), and the outlet of the second solenoid valve (102) is connected to the regeneration pipeline (200). When the pipeline switching structure is in the first state, the first solenoid valve (101) is open. When the pipeline switching structure is in the second state, the second solenoid valve (102) is open.

5. The water purification system according to claim 3, characterized in that, The pipeline switching structure is a two-way valve (103). The inlet (1031) of the two-way valve (103) is connected to the water storage unit (3). The first outlet (1032) of the two-way valve (103) is connected to the first heat exchange channel. The second outlet (1033) of the two-way valve (103) is connected to the regeneration pipeline (200). When the pipeline switching structure is in the first state, the inlet (1031) of the two-way valve (103) and the first outlet (1032) are connected. When the pipeline switching structure is in the second state, the inlet (1031) of the two-way valve (103) and the second outlet (1033) are connected.

6. The water purification system according to any one of claims 1 to 5, characterized in that, The control valve assembly also includes a drain valve (301) disposed in the drain line (300) and / or a regeneration valve (201) disposed in the regeneration line (200).

7. The water purification system according to any one of claims 1 to 5, characterized in that, The pre-filter (1) includes a first filter unit (11), the first filter unit (11) includes the activated carbon component, the first inlet (111) is connected to the inlet of the first filter unit (11), and the first outlet (112) is connected to the outlet of the first filter unit (11).

8. The water purification system according to claim 7, characterized in that, The pre-filter (1) has a second inlet (121) and a second outlet (122). The pre-filter (1) also includes a second filter unit (12) that is independently set with the first filter unit (11). The second filter unit (12) includes the activated carbon component. The second inlet (121) is connected to the inlet of the second filter unit (12), and the second outlet (122) is connected to the outlet of the second filter unit (12). The water storage unit (3) is connected to the second outlet (122). The water purification device also includes a fine filter element (2), which has a fine filter element inlet (21) and a pure water outlet (22). The fine filter element inlet (21) is connected to the first water outlet (112), and the pure water outlet (22) is connected to the second water inlet (121).

9. The water purification system according to any one of claims 1 to 5, characterized in that, The water production device also includes a post-filter (4), which is disposed between the water storage unit (3) and the heat exchange unit (5).

10. A control method for a water purification system, characterized in that, The control method of the water purification system is executed by the water purification system according to any one of claims 1 to 9, and the control method of the water purification system includes: The water purification system is controlled to perform a hot regeneration mode by controlling the valve group, and the boiling water of the heating unit (6) is controlled to flow into the second heat exchange channel and exchange heat with the room temperature water from the water storage unit (3) in the first heat exchange channel to form a preset value of hot water. The hot water flows through the regeneration pipeline (200), the first outlet (112), the pre-filter (1), the first inlet (111) and the drain pipeline (300) to realize the reverse hot flushing regeneration of the pre-filter (1).

11. The control method for the water purification system according to claim 10, characterized in that, Also includes: When the hot regeneration mode is completed, the water purification system is controlled to execute the cooling mode through the control valve group, and the room temperature water in the water storage unit (3) is controlled to flow through the regeneration pipeline (200), the first outlet (112), the pre-filter (1), the first inlet (111) and the drain pipeline (300) to achieve rinsing and cooling of the pre-filter (1).

12. The control method for the water purification system according to claim 11, characterized in that, If the duration of the thermal regeneration mode is T1 and the duration of the cooling mode is T2, then T1 > T2.

13. The control method for the water purification system according to claim 12, characterized in that, T2 < 5 min.

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