Indoor water purification equipment

Abstract

The invention relates to indoor water purification equipment which comprises a machine shell, a pre-filtering system, a filtering system, a control system and a water production system are arranged in the machine shell, and a water supply system is arranged outside the machine shell. Wherein the pre-filtration system is used for filtering particles with the particle size of 20-150 microns in tap water, the filtration system is used for producing drinking water containing mineral substances, the water production system is used for storing the drinking water produced by the filtration system, the water supply system comprises a water supply pipeline, and the inlet end of the water supply pipeline is communicated with the outlet end of the water production system; a variable-frequency water pump and a stop valve are sequentially arranged on the water supply pipeline, a water taking opening is formed in the tail end of the water supply pipeline, and the control system is used for circulation and closing of all the pipelines. The invention mainly aims to provide the indoor water purification equipment, which can maintain the balance of mineral substances in drinking water while shortening the filtering process.

Description

Technical Field

[0001] The present invention relates to a water treatment device, and more particularly to an indoor water purification device. Background Art

[0002] The use of water purification devices in households can effectively remove bacteria, heavy metals, chemical pollutants and impurities in tap water, ensure drinking water safety, and reduce long-term health risks; at the same time, it can improve the taste of water quality, eliminate residual chlorine, abnormal colors and odors, reduce the dependence on bottled water to save costs and reduce plastic pollution. Especially for families with infants, the elderly or in areas with poor water quality, it is a key choice to improve the quality of life and health protection.

[0003] Existing water purification devices need to go through sand filtration → activated carbon filtration → microfiltration → ultrafiltration → chemical dosing treatment → pH adjustment → high-pressure pump → reverse osmosis membrane → pH adjustment → disinfection → ion exchange → water outlet. The process is complex. When applied to households or large indoor places, the made water purification devices occupy a large area. At the same time, the above filtration methods also filter out the beneficial minerals in the water, resulting in the need to supplement beneficial minerals through other means when drinking this mineral-deficient water for a long time. Therefore, for subsequent purification of water treatment using an ultrafiltration membrane, the ultrafiltration membrane mainly uses the sieving principle to separate macromolecular substances, colloids, bacteria and viruses in water through the micropores on the membrane. Its pore size is generally between 0.01 and 0.1 microns, which can effectively remove large particle pollutants and allow minerals and smaller ions to pass through. Therefore, ultrafiltration membranes are often used to retain beneficial minerals in water. However, ultrafiltration membranes cannot filter small molecular substances (such as heavy metal ions, dissolved salts). Therefore, ultrafiltration membranes focus on basic purification, and the minerals in the drinking water after ultrafiltration membrane filtration still cannot be balanced. Summary of the Invention

[0004] The main object of the present invention is to provide an indoor water purification device that can shorten the filtration process while maintaining the balance of minerals in drinking water.

[0005] To achieve the above object, the present invention provides an indoor water purification device, including a housing, and inside the housing are provided: A pre-filtering system for filtering particles with a particle size of 20μm - 150μm in tap water. The pre-filtering system includes an inlet pipeline, on which an inlet electric control valve, a filter and an inlet flowmeter are successively arranged; A filtering system for producing drinking water containing minerals. The end of the inlet pipeline is communicated with the inlet end arranged at the bottom of the filtering system. The top of the filtering system is provided with a concentrated water pipeline, which is communicated with the first water outlet of the filtering system. The concentrated water pipeline discharges the filtered water generated by the filtering system outside the water purification device, and a concentrated water electric control valve is arranged on the concentrated water pipeline; A water production system for storing the drinking water produced by a filtration system. The water production system includes a water production pipeline. The inlet end of the water production pipeline is connected to the second water outlet of the filtration system, and the outlet end of the water production pipeline is connected to the water production system. A water production flow meter, a water production electric control valve, and a carbon filter element are successively arranged on the water production pipeline. A water supply system is provided outside the casing. The water supply system includes a water supply pipeline. The inlet end of the water supply pipeline is connected to the outlet end of the water production system. A variable-frequency water pump and a cut-off valve are successively arranged on the water supply pipeline, and a water intake is provided at the end of the water supply pipeline. A control system is electrically connected to the inlet water electric control valve, the water production electric control valve, the concentrated water electric control valve, and the variable-frequency water pump.

[0006] Preferably, the filtration system is a hollow fiber nanofiltration membrane; the water production system is a water production tank.

[0007] Further preferably, the water production tank is located at the back side inside the casing. The hollow fiber nanofiltration membrane and the control system are both located in front of the water production tank, and the two are arranged side by side.

[0008] Even more preferably, a backwash pipeline is further provided inside the casing. The inlet end of the backwash pipeline is connected to the outlet end of the water production tank, and the outlet end of the backwash pipeline is connected to the second water outlet of the hollow fiber nanofiltration membrane. A backwash electric control valve is arranged on the backwash pipeline, and the backwash electric control valve is electrically connected to the control system. The backwash pipeline is used to balance the water concentration inside the hollow fiber nanofiltration membrane when the water purification device is in a non-working state.

[0009] Even more preferably, a forward flushing pipeline is further provided inside the casing. The inlet end of the forward flushing pipeline is connected to the outlet end of the water production tank, and the outlet end of the forward flushing pipeline is connected to the inlet end of the hollow fiber nanofiltration membrane. A forward flushing electric control valve is arranged on the forward flushing pipeline, and the forward flushing electric control valve is electrically connected to the control system. The forward flushing pipeline is used to balance the water concentration inside the hollow fiber nanofiltration membrane when the water purification device is in a non-working state.

[0010] Even more preferably, a drain pipeline is further provided inside the casing. The inlet end of the drain pipeline is connected to the inlet end of the hollow fiber nanofiltration membrane, and the outlet end of the drain pipeline is connected to the concentrated water pipeline. The drain pipeline is used to drain the stored water inside the hollow fiber nanofiltration membrane, and a drain valve is arranged on the drain pipeline.

[0011] Even more preferably, a water production discharge pipeline is further provided inside the casing. The inlet end of the water production discharge pipeline is connected to the second water outlet of the hollow fiber nanofiltration membrane, and a discharge electric control valve, and the discharge electric control valve is electrically connected to the control system.

[0012] Further preferably, a water return pipeline is also provided inside the casing. The inlet end of the water return pipeline is communicated with the outlet end of the water production tank, and the outlet end of the water return pipeline is communicated with the water inlet pipeline. The water return pipeline is used to drain the stored water in the water supply pipeline into the water production tank for secondary disinfection by the ultraviolet disinfection device in the water production tank.

[0013] Further preferably, a two-way pipeline is also provided outside the casing. The inlet end of the two-way pipeline is communicated with the water inlet pipeline, and the outlet end of the two-way pipeline is communicated with the water supply pipeline.

[0014] Further preferably, the membrane housing of the hollow fiber nanofiltration membrane is in a straight cylindrical shape.

[0015] The beneficial effects of the present invention are as follows: The overall water production process of the present invention is short: ordinary filter → nanofiltration membrane → carbon filter → disinfection → water outlet, and the process is greatly reduced. The pre-filtering system can filter particles with a particle size of 20μm - 150μm in tap water, reduce the burden on subsequent filtration, and extend the service life of the subsequent filtration system. The filtration system uses a hollow fiber nanofiltration membrane, which can produce drinking water containing minerals. While removing harmful substances, it retains minerals beneficial to the human body and improves the quality of drinking water. By using the backwashing pipeline and the forward flushing pipeline, when the water purification device is in a non-working state, the backwashing pipeline can balance the water concentration inside the hollow fiber nanofiltration membrane. Controlled by the backwashing electric control valve, water is drawn from the water production tank to backwash the hollow fiber nanofiltration membrane, which helps prevent membrane fouling, extends the service life of the membrane, and ensures the filtration effect.

[0016] At the same time, the membrane housing of the hollow fiber nanofiltration membrane in the present invention is in a conical cylindrical shape, and the second water outlet enters the membrane housing in a tangential direction. This design helps to form a special water flow state during the filtration process, promotes the improvement of the filtration effect, enables the water flow to form a swirling flow inside the membrane housing, enhances the scouring effect on the membrane surface, reduces the deposition of impurities on the membrane surface, and further improves the filtration efficiency and service life of the membrane. Description of the Drawings

[0017] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0018] Figure 1 is a schematic three-dimensional structure diagram of the indoor water purification device of the present invention; Figure 2 is a schematic internal structure diagram of the indoor water purification device of the present invention; Figure 3 is a schematic internal structure diagram of the indoor water purification device of the present invention from another angle; Figure 4 Schematic connection diagram of the pipelines of the indoor water purification device of the present invention.

[0019] Description of the Reference Numerals in the Drawings 1. Hollow fiber nanofiltration membrane; 2. Control system; 3. Product water tank; 4. Machine shell; 10. Water inlet; 20. Discharge port; 30. Forward flushing port; 40. Drinking water outlet; 50. Circulation return water port; 100. Water inlet pipeline; 110. Water inlet electric control valve; 120. Filter; 130. Water inlet flowmeter; 200. Product water pipeline; 210. Product water flowmeter; 220. Product water electric control valve; 230. Carbon filter element; 300. Water supply pipeline; 310. Variable frequency water pump; 320. Shut-off valve; 330. Water intake point; 400. Backwashing pipeline; 410. Backwashing electric control valve; 500. Concentrate water pipeline; 510. Concentrate water electric control valve; 600. Forward flushing pipeline; 610. Forward flushing electric control valve; 700. Product water discharge pipeline; 710. Discharge electric control valve; 800. Return water pipeline; 810. Return water electric control valve; 900. Two-way pipeline. Detailed implementation manner

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0021] As Figures 1 to 4 shown, this embodiment provides an indoor water purification device, including a machine shell 4, on which a door that can be opened is provided, and the internal equipment can be repaired through the door.

[0022] The specific internal equipment of the casing 4 includes a pre-filtering system, a filtering system, a water production system, and a control system 2. Among them, the pre-filtering system is used to filter particles with a particle size of 20μm - 150μm in tap water. The larger the numerical value of the filtered particle size in the pre-filtering system, the lower the filtering accuracy, and vice versa. Choosing a too high or too low filtering accuracy will affect the system. A too high filtering accuracy will cause the pre-filtering system to clog, and a too low filtering accuracy will cause the filtering system to clog. In this embodiment, particles of 30μm - 75μm are used, which can effectively intercept particles of 30 - 75μm in tap water (such as sediment and rust). While extending the service life of the filtering system, it can effectively reduce the risk of clogging of the filtering system.

[0023] In this embodiment, the pre-filtering system includes a water inlet pipeline 100. An inlet electric control valve 110, a filter 120, and an inlet water flowmeter 130 are successively arranged on the water inlet pipeline 100. It should be noted that the installation positions of the various instruments in this embodiment are based on the direction of the water flow in each pipeline. Among them, the inlet electric control valve 110 and the inlet water flowmeter 130 are electrically connected to the control system 2. An inlet 10 is opened on the side of the casing 4, and the external tap water enters the water inlet pipeline 100 through the inlet 10. The tap water is preliminarily filtered through the filter 120 and then enters the filtering system.

[0024] The filtering system filters the preliminarily filtered tap water again to produce drinking water containing minerals. The end of the water inlet pipeline 100 is communicated with the inlet end arranged at the bottom of the filtering system. A concentrated water pipeline 500 is arranged at the top of the filtering system. The concentrated water pipeline 500 is communicated with the first water outlet of the filtering system. The concentrated water pipeline 500 discharges the filtered water generated by the filtering system to the outside of the water purification equipment through the discharge port 20. A concentrated water electric control valve 510 electrically connected to the control system 2 is arranged on the concentrated water pipeline 500. In this embodiment, the filtering system is a hollow fiber nanofiltration membrane 1, which selectively filters divalent and higher-valent ions (such as heavy metals, calcium and magnesium ions) and organic substances in water by using the hollow fiber nanofiltration membrane 1, and at the same time retains some monovalent minerals (such as potassium and sodium), so as to produce drinking water with minerals.

[0025] The water produced by the filtration system is stored through the water production system. Specifically, the water production system includes a water production pipeline 200. The inlet end of the water production pipeline 200 is communicated with the second water outlet of the filtration system, and the outlet end of the water production pipeline 200 is communicated with the water production system. A water production flowmeter 210, a water production electric control valve 220, and a carbon filter element 230 are sequentially arranged on the water production pipeline 200. In this way, as a supplementary purification step after hollow fiber nanofiltration, the carbon filter element 230 is used to solve the problems of residual chlorine, peculiar smell, and small molecule organic matters. In this embodiment, the combination of the hollow fiber nanofiltration membrane 1 + the carbon filter element 230 realizes double purification of "physical screening (nanofiltration) + chemical adsorption (activated carbon)", covering a wider range of pollutants, and at the same time balancing the requirements of mineral retention and deep purification. The combination of the two makes up for the limitations of the nanofiltration technology, and finally ensures the water quality safety and excellent taste, meeting the high standards for direct indoor drinking water.

[0026] In this embodiment, the water production system is a water production tank 3. An ultraviolet sterilization device is also arranged on one side of the water production tank 3 to kill microorganisms in the water production tank 3 and ensure the safety of the stored water.

[0027] In this embodiment, the water supply system is arranged outside the housing 4. The water supply system includes a water supply pipeline 300. The inlet end of the water supply pipeline 300 is communicated with the outlet end of the water production system, and the water supply pipeline 300 passes through the drinking water outlet 40 arranged at the bottom of the housing 4. A variable frequency water pump 310 and a cut-off valve 320 electrically connected to the control system 2 are sequentially arranged on the water supply pipeline 300. A water intake is arranged at the end of the water supply pipeline 300. At the same time, the outlet end of the water supply pipeline 300 flows into the water production tank 3 inside the housing 4 through the circulating return water port 50 arranged at the top of the housing 4. Among them, a water supply electric control valve 340 electrically connected to the control system 2 is also arranged on the water supply pipeline 300, and the water supply electric control valve 340 is located between the water intake point 330 and the circulating return water port 50.

[0028] In this embodiment, as Figure 2 and Figure 3 shown, the water production tank 3 is located on the back side inside the housing 4. The hollow fiber nanofiltration membrane 1 and the control system 2 are both located in front of the water production tank 3, and the two are arranged side by side.

[0029] In addition, in this embodiment, a backwash pipeline 400 is further provided inside the casing 4. The inlet end of the backwash pipeline 400 is communicated with the outlet end of the product water tank 3, and the outlet end of the backwash pipeline 400 is communicated with the second water outlet of the hollow fiber nanofiltration membrane 1. A backwash electric control valve 410 electrically connected to the control system 2 is provided on the backwash pipeline 400. The backwash electric control valve 410 is electrically connected to the control system 2. The backwash pipeline 400 is used to balance the concentration of water inside the hollow fiber nanofiltration membrane 1 when the water purification device is in a non-working state. At the same time, the backwash pipeline 400 is also used to flush the impurities on the surface of the membrane core of the hollow fiber nanofiltration membrane 1. In this embodiment, the membrane housing of the hollow fiber nanofiltration membrane 1 is in a straight cylindrical shape.

[0030] In addition, in other embodiments, the membrane housing of the hollow fiber nanofiltration membrane 1 can also be designed as a conical cylinder shape. At the same time, the second water outlet of the hollow fiber nanofiltration membrane 1 enters the membrane housing in a tangential direction. In this way, it helps to form a special water flow state during the membrane core cleaning process, making the water flow form a swirling flow inside the membrane housing, enhancing the scouring effect on the membrane surface, reducing the deposition of impurities on the membrane surface, and thus further improving the filtration efficiency and service life of the membrane. The backwash pipeline 400 needs to provide a certain working pressure during the backwash process to complete the backwash operation. The purpose of increasing the backwash pressure is to balance the pressure difference inside and outside the membrane. This is because when the water purification device is working normally, there is a certain pressure difference between the inside and outside of the hollow fiber nanofiltration membrane 1, enabling water to pass through the membrane core for filtration. When backwashing, this pressure difference needs to be broken so that the water flows reversely into the membrane core. The additional working pressure can help balance the pressure inside and outside the membrane core, prompting the water flow to reverse, thereby realizing the cleaning of the inside of the membrane core and ensuring that the pollutants inside the membrane core can also be effectively flushed away, guaranteeing the overall performance of the membrane core.

[0031] In this embodiment, a forward flush pipeline 600 is further provided inside the casing 4. The inlet end of the forward flush pipeline 600 is communicated with the outlet end of the product water tank 3. The forward flush pipeline 600 enters the inside of the casing 4 through a forward flush port 30 provided on the casing 4. The outlet end of the forward flush pipeline 600 is communicated with the inlet end of the hollow fiber nanofiltration membrane 1. A forward flush electric control valve 610 is provided on the forward flush pipeline 600. The forward flush electric control valve 610 is electrically connected to the control system 2. The forward flush pipeline 600 is mainly used to balance the concentration of water inside the hollow fiber nanofiltration membrane 1 when the water purification device is in a non-working state. Both the forward flush pipeline 600 and the backwash pipeline 400 directly draw water from the product water tank 3 to flush the hollow fiber nanofiltration membrane 1. The forward flush pipeline 600 does not need to provide additional working pressure during the working process. It can be seen that the working requirements of the two are different. The forward flush pipeline 600 can only clean the impurities on the surface of the membrane core.

[0032] In this embodiment, an air release pipeline is further provided inside the casing 4. The inlet end of the air release pipeline is communicated with the inlet end of the hollow fiber nanofiltration membrane 1, and the outlet end of the air release pipeline is communicated with the end of the concentrated water pipeline 500. The air release pipeline is used to release the stored water in the hollow fiber nanofiltration membrane 1, and an air release electric control valve is provided on the air release pipeline. In this way, problems such as bacteria growth or water deterioration caused by long-term static placement are avoided, which is beneficial to the maintenance and upkeep of the equipment.

[0033] In this embodiment, a product water discharge pipeline 700 is further provided inside the casing 4. The inlet end of the product water discharge pipeline 700 is communicated with the second water outlet of the hollow fiber nanofiltration membrane 1, and an emission electric control valve 710 is provided on the product water discharge pipeline 700. The emission electric control valve 710 is electrically connected to the control system 2. The purpose of the product water discharge pipeline 700 is that the newly installed hollow fiber nanofiltration membrane 1 for the first time needs to be flushed, and the flushed water cannot enter the product water tank 3. Therefore, this product water discharge pipeline 700 discharges the product water for flushing to the floor drain to ensure the cleanliness and hygiene of the water quality inside the water tank.

[0034] In this embodiment, a return water pipeline 800 is further provided inside the casing 4. The inlet end of the return water pipeline 800 is communicated with the end of the water intake point 330, and the outlet end of the return water pipeline 800 is communicated with the product water tank 3. The return water pipeline 800 is used to drain the stored water in the water supply pipeline 300 into the product water tank 3. The purpose of the return water pipeline 800 is to avoid excessive microorganisms in the stored water between the product water tank 3 and the water intake point 330 in the water supply pipeline 300 due to long-term non-use. Therefore, it is necessary to disinfect the stored water in the water supply pipeline 300 again, thereby improving the water utilization rate, avoiding water resource waste, and also helping to ensure the quality of the product water.

[0035] In addition, in this embodiment, outside the water purification treatment equipment, a two-way pipeline 900 is further provided between the water intake point 330 and the tap water. The purpose of the two-way pipeline 900 is to avoid the water intake point 330 from being able to continue supplying water when the water purification treatment equipment is damaged or under repair.

[0036] The specific water purification treatment process of this embodiment is as follows: S100: The water purification treatment equipment is powered on and starts running.

[0037] The control system 2 confirms whether it is the first startup. If it is the first startup, the hollow fiber nanofiltration membrane 1 is cleaned. If not, step S200 is started.

[0038] In this step, if it is the first startup, the control system 2 opens the inlet water electric control valve 110, the concentrated water electric control valve 510, and the drainage electric control valve 710, closes the electric control valves on other pipelines, cleans the hollow fiber nanofiltration membrane 1. After the preset cleaning time, the drainage electric control valve 710 is closed, and the product water electric control valve 220 is opened.

[0039] S200: The control system 2 detects whether the electric control valves on each pipeline are in the working state: keep the water inlet electric control valve 110, the concentrated water electric control valve 510, the produced water electric control valve 220 and the water supply electric ball valve 340 in the open state, and the electric control valves on other pipelines in the closed state.

[0040] S300: Tap water is filled into the water inlet pipeline 100. After being preliminarily filtered by the filter 120, the tap water is secondarily filtered by the hollow fiber nanofiltration membrane 1, and then tertiarily filtered by the carbon filter element 230 on the produced water pipeline 200 and then stored in the produced water tank 3. The produced concentrated water is discharged through the concentrated water pipeline 500.

[0041] In this step, a water quality detector and a conductivity detector are respectively installed on the water supply pipeline 300 and the produced water pipeline 200. The water quality detector is used to detect the pH value of the water, and the conductivity detector is used to detect the conductivity of the water quality. When the detection results of the water quality detector and / or the conductivity detector on the water supply pipeline 300 or the produced water pipeline 200 exceed the preset range, the control system 2 issues an alarm. In this embodiment, the preset values of the water quality detector and the conductivity detector on the produced water pipeline 200 are higher than the preset values of the water quality detector and the conductivity detector on the water supply pipeline 300.

[0042] In addition, in this embodiment, the discharge amount of the concentrated water pipeline 500 is maintained between 10% and 30%. A low discharge amount of the concentrated water will cause a decline in the quality of the produced water, and a high discharge amount will improve the quality of the produced water, but it will waste water resources. Therefore, the economic discharge amount is between 10% and 30% to ensure the quality of the produced water while saving water resources.

[0043] S400: After the drinking water in the produced water tank 3 reaches the preset storage amount, the hollow fiber filtration membrane 1 stops producing water.

[0044] In this step, when the drinking water in the produced water tank 3 decreases to the preset storage amount, the control system 2 executes step S300.

[0045] S500: After the hollow fiber nanofiltration membrane 1 finishes producing water, the control system 2 opens the positive flushing electric control valve 610 on the positive flushing pipeline 600, keeps the concentrated water electric control valve 510 and the produced water electric control valve 220 in the open state, and at the same time closes the electric control valves on other pipelines to perform a positive flushing operation on the hollow fiber nanofiltration membrane 1. In this step, the cut-off valve 320 remains in the open state. The water in the positive flushing pipeline 600 draws drinking water from the produced water tank 3 and uses the drinking water for positive flushing. The water after positive flushing is discharged through the concentrated water pipeline 500.

[0046] In this step, when the control system 2 receives that the detection results of the conductivity detector on the concentrated water pipeline 500 are consistent with those of the conductivity detector on the product water pipeline 200 (the consistency indicates that the surfaces of the hollow fiber nanofiltration membranes 1 in both are already rinsed clean), the forward flushing is stopped and the operation is completed.

[0047] S600: After the hollow fiber nanofiltration membrane 1 reaches the preset flow rate of filtered water, the control system 2 opens the backwash electric control valve 410, keeps the concentrated water electric control valve 510 in the open state, and at the same time closes the electric control valves on other pipelines to backwash the hollow fiber nanofiltration membrane 1.

[0048] In this step, the cut-off valve 320 also remains in the open state. The flow rate of the backwash water in the hollow fiber nanofiltration membrane 1 is 200 - 1200 L / H, and the pressure is 2 - 5 bar. The flow rate of the backwash water increases with the number of membranes, while the pressure remains unchanged.

[0049] In this step, when the control system 2 detects and accumulates to the threshold of the water filtered by the hollow fiber nanofiltration membrane 1, if the purified water equipment is still in frequent use, the control system 2 will record it and delay the backwashing. When the control system 2 reaches the state where the purified water equipment is in non-frequent use, the control system 2 will start the backwash working mode and start to execute this step. When the control system 2 receives that the detection results of the conductivity detector on the concentrated water pipeline 500 are consistent with those of the conductivity detector on the product water pipeline 200 (the consistency indicates that the hollow fiber nanofiltration membrane is rinsed clean), the backwash operation is completed.

[0050] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

Claims

1. An indoor water purification device, characterized in that, It includes a casing, and inside the casing are provided: A pre-filtering system for filtering particles with a particle size of 20μm - 150μm in tap water. The pre-filtering system includes an inlet water pipeline, on which an inlet water electric control valve, a filter, and an inlet water flowmeter are successively arranged; A filtering system for producing drinking water containing minerals. The end of the inlet water pipeline is communicated with the inlet end arranged at the bottom of the filtering system. The top of the filtering system is provided with a concentrated water pipeline, which is communicated with the first water outlet of the filtering system. The concentrated water pipeline discharges the filtered water generated by the filtering system outside the water purification device, and a concentrated water electric control valve is arranged on the concentrated water pipeline; A water production system for storing the drinking water generated by the filtering system. The water production system includes a water production pipeline, the inlet end of which is communicated with the second water outlet of the filtering system, and the outlet end of the water production pipeline is communicated with the water production system. On the water production pipeline, a water production flowmeter, a water production electric control valve, and a carbon filter element are successively arranged; Outside the casing is provided a water supply system, which includes a water supply pipeline. The inlet end of the water supply pipeline is communicated with the outlet end of the water production system. On the water supply pipeline, a variable frequency water pump and a cut-off valve are successively arranged, and a water intake port is arranged at the end of the water supply pipeline; A control system, which is electrically connected to the inlet water electric control valve, the water production electric control valve, the concentrated water electric control valve, and the variable frequency water pump.

2. The indoor water purification device according to claim 1, wherein, The filtering system is a hollow fiber nanofiltration membrane; the water production system is a water production tank.

3. An indoor water purification device according to claim 2, characterized in that, The water production tank is located at the back side inside the casing. The hollow fiber nanofiltration membrane and the control system are both located in front of the water production tank and are arranged side by side.

4. An indoor water purification device according to claim 3, characterized in that, Inside the casing is also provided a backwashing pipeline. The inlet end of the backwashing pipeline is communicated with the outlet end of the water production tank, and the outlet end of the backwashing pipeline is communicated with the second water outlet of the hollow fiber nanofiltration membrane. A backwashing electric control valve is arranged on the backwashing pipeline, and the backwashing electric control valve is electrically connected to the control system. The backwashing pipeline is used to balance the water concentration inside the hollow fiber nanofiltration membrane when the water purification device is in a non-working state.

5. An indoor water purification device according to claim 3, characterized in that, Inside the casing is also provided a forward flushing pipeline. The inlet end of the forward flushing pipeline is communicated with the outlet end of the water production tank, and the outlet end of the forward flushing pipeline is communicated with the inlet end of the hollow fiber nanofiltration membrane. A forward flushing electric control valve is arranged on the forward flushing pipeline, and the forward flushing electric control valve is electrically connected to the control system. The forward flushing pipeline is used to balance the water concentration inside the hollow fiber nanofiltration membrane when the water purification device is in a non-working state.

6. An indoor water purification device according to claim 3, characterized in that, Inside the casing is also provided a draining pipeline. The inlet end of the draining pipeline is communicated with the inlet end of the hollow fiber nanofiltration membrane, and the outlet end of the draining pipeline is communicated with the concentrated water pipeline. The draining pipeline is used to drain the stored water inside the hollow fiber nanofiltration membrane, and a drain valve is arranged on the draining pipeline.

7. An indoor water purification device according to claim 3, characterized in that, Inside the casing, there is also a produced water discharge pipeline. The inlet end of the produced water discharge pipeline is communicated with the second water outlet of the hollow fiber nanofiltration membrane, and there is a discharge electric control valve which is electrically connected to the control system.

8. The indoor water purification device according to claim 3, wherein, Inside the casing, there is also a return water pipeline. The inlet end of the return water pipeline is communicated with the outlet end of the produced water tank, and the outlet end of the return water pipeline is communicated with the water inlet pipeline. The return water pipeline is used to drain the stored water in the water supply pipeline into the produced water tank for secondary disinfection by the ultraviolet disinfection device in the produced water tank.

9. An indoor water purification device according to any one of claims 3, characterized in that, Outside the casing, there is also a two-way pipeline. The inlet end of the two-way pipeline is communicated with the water inlet pipeline, and the outlet end of the two-way pipeline is communicated with the water supply pipeline.

10. An indoor water purification device according to any one of claims 3-9, characterized in that, The membrane housing of the hollow fiber nanofiltration membrane is in a straight cylinder shape.

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