Water purifier with self-cleaning RO (Reverse Osmosis) membrane

Abstract

The embodiment of the utility model discloses a water purifier with a self-cleaning RO (Reverse Osmosis) membrane. The water purifier comprises a water inlet pipe, a heating pipe, a purified water pipe and a wastewater pipe, a booster pump and an RO membrane reverse osmosis filter element are arranged on the water purification pipe, and a heating device is arranged on the heating pipe; the water inlet pipe is communicated with a water inlet of the booster pump, a purified water outlet of the RO membrane reverse osmosis filter element is communicated with a water inlet of the heating device, a hot water outlet of the heating device is communicated with a water inlet of the booster pump, a wastewater port of the RO membrane reverse osmosis filter element is communicated with the wastewater pipe, and purified water is discharged from the purified water outlet of the RO membrane reverse osmosis filter element; the booster pump pumps water in the water inlet pipe into the RO membrane reverse osmosis filter element to be purified, the heating device heats purified water prepared by the system, the booster pump pumps the purified water heated by the heating device into the RO membrane reverse osmosis filter element to be circularly washed, the anti-pollution capacity of the RO membrane reverse osmosis filter element is improved, the service life of the RO membrane reverse osmosis filter element is prolonged, and the purified water purification quality of the RO membrane reverse osmosis filter element is improved. The core replacement frequency is reduced, and finally the purification cost is reduced.

Description

Technical Field

[0001] The utility model embodiment relates to the technical field of drinking water, and in particular to a RO membrane self-cleaning water purifier. Background Art

[0002] At present, in the field of water purification technology using reverse osmosis membrane separation, membrane pollution has always been a difficult problem in the industry that seriously affects the service life of the membrane. Most of the existing methods to improve membrane pollution use frequent flushing and frequent core replacement. These methods are not only energy-intensive but also waste water. Frequent membrane replacement greatly increases the purification cost, restricting the development of the industry. Utility Model Content

[0003] In view of this, an embodiment of the utility model provides an RO membrane self-cleaning water purifier, which utilizes a heating device to heat the purified water prepared by the system itself, and circulates and flushes it in the RO membrane reverse osmosis filter element, thereby improving the anti-pollution ability, service life and pure water purification quality of the RO membrane reverse osmosis filter element, reducing the frequency of core replacement, and ultimately reducing purification costs.

[0004] The active cleaning of the membrane is achieved by changing the fluid temperature based on the automatic control principle, which improves the anti-pollution performance of the RO membrane, reduces the purification cost, and provides a new idea for the development of surface cleaning technology in the subsequent membrane filtration water purification field.

[0005] In a first aspect, the embodiment of the utility model provides an RO membrane self-cleaning water purifier, comprising a water inlet pipe, a heating pipe, a clean water pipe and a waste water pipe; a booster pump and an RO membrane reverse osmosis filter element are arranged on the clean water pipe, and a heating device is arranged on the heating pipe;

[0006] The water inlet pipe is connected to the water inlet of the booster pump, the clean water outlet of the RO membrane reverse osmosis filter element is connected to the water inlet of the heating device, the hot water outlet of the heating device is connected to the water inlet of the booster pump, the waste water outlet of the RO membrane reverse osmosis filter element is connected to the waste water pipe, and the clean water outlet of the RO membrane reverse osmosis filter element discharges purified water;

[0007] Wherein, the heating device is used to contain and heat purified water; the booster pump is used to pump water in the water inlet pipe into the RO membrane reverse osmosis filter element for purification, and is also used to pump purified water heated by the heating device into the RO membrane reverse osmosis filter element for circulating flushing.

[0008] Optionally, the heating device includes a water tank, a heating body, and an exhaust valve; the heating body is arranged in the water tank, and the exhaust valve is arranged on the exhaust pipe of the water tank.

[0009] Optionally, the volume of the water storage tank is not less than the volume of the RO membrane reverse osmosis filter element.

[0010] Optionally, the heating device further includes a water outlet valve; the water outlet valve is arranged on the heating pipe between the water storage tank and the booster pump.

[0011] Optionally, the heating device further comprises a water level switch, wherein the water level switch is arranged in the water tank and is used for detecting an upper water level and a lower water level of the water tank.

[0012] Optionally, the heating device further includes a first temperature sensor and a float; the first temperature sensor and the float are both disposed in the water tank.

[0013] Optionally, a pressure sensor is provided on the clean water pipe between the booster pump and the RO membrane reverse osmosis filter element;

[0014] A flow meter, a pure water outlet valve and a pure water outlet faucet are also arranged in sequence on the clean water pipe at the clean water outlet of the RO membrane reverse osmosis filter element;

[0015] Wherein, the pure water outlet faucet includes a cleaning key and a water making key.

[0016] Optionally, a scale inhibitor and a wastewater valve are provided on the wastewater pipe.

[0017] Optionally, a second temperature sensor is also provided on the wastewater outlet of the RO membrane reverse osmosis filter element.

[0018] Optionally, a filter element and a water inlet valve are provided on the water inlet pipe.

[0019] In summary, the water purifier provided in the embodiment of the present application adds a heating device to the clean water outlet of the RO membrane reverse osmosis filter element, uses the heating device to heat the purified water, and then uses a booster pump to pump the heated purified water into the RO membrane reverse osmosis filter element for circulation and flushing, thereby completing the self-cleaning of the membrane, thereby improving the cleaning effect after membrane contamination, improving the anti-pollution ability, service life and pure water purification quality of the RO membrane reverse osmosis filter element, reducing the frequency of core replacement, and ultimately reducing the purification cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a RO membrane self-cleaning water purifier provided in this application;

[0021] Figure 2 A schematic diagram of another RO membrane self-cleaning water purifier provided in this application;

[0022] Figure 3 for Figure 2 The electrical control schematic diagram of the RO membrane self-cleaning water purifier is provided.

[0023] The accompanying drawings illustrate:

[0024] 1. Water supply port; 2. Filter element; 3. Water inlet valve; 4. Booster pump; 5. Pressure sensor; 6. RO membrane reverse osmosis filter element; 7. Flow meter; 8. Pure water outlet valve; 9. Second temperature sensor; 10. Scale inhibitor; 11. Waste water valve; 12. Waste water outlet; 13 Water storage tank; 14. First temperature sensor; 15. Float; 16. Heating body; 17. Water level switch; 18. Exhaust valve; 20. Heating device; 21. Water outlet valve; 22. Pure water outlet faucet; 23. Cleaning key; 24. Water making key. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only the parts related to the present application, rather than all structures, are shown in the accompanying drawings.

[0026] Example

[0027] Figure 1 A schematic diagram of a RO membrane self-cleaning water purifier provided in this application. Figure 1 As shown, an embodiment of the present application provides an RO membrane self-cleaning water purifier, which includes a water inlet pipe G1, a heating pipe G2, a clean water pipe G3 and a waste water pipe G4; a booster pump 4 and an RO membrane reverse osmosis filter element 6 are arranged on the clean water pipe G3, and a heating device 20 is arranged on the heating pipe G2; the water inlet pipe G1 is connected to the water inlet of the booster pump 4, the clean water outlet of the RO membrane reverse osmosis filter element 6 is connected to the water inlet of the heating device 20, the hot water outlet of the heating device 20 is connected to the water inlet of the booster pump 4, the waste water outlet of the RO membrane reverse osmosis filter element 6 is connected to the waste water pipe G4, and the clean water outlet of the RO membrane reverse osmosis filter element 6 discharges purified water W1; wherein the heating device 20 is used to contain and heat the purified water W1; the booster pump 4 is used to pump the water in the water inlet pipe G1 into the RO membrane reverse osmosis filter element 6 for purification, and is also used to pump the purified water W1 heated by the heating device 20 into the RO membrane reverse osmosis filter element 6 for circulating flushing.

[0028] Specifically, the control system of the water purifier can be composed of software and / or hardware, and the control system can be integrated into the main control board of the water purifier. The water inlet pipe G1 can be connected to the water supply port W of the tap water W0 to provide a clean water source. The water outlet of the water inlet pipe G1 is connected to the water inlet of the booster pump 4, and the water outlet of the booster pump 4 is connected to the water inlet of the RO membrane reverse osmosis filter element 6. The booster pump 4 pumps the tap water W0 in the water inlet pipe G1 into the RO membrane reverse osmosis filter element 6, and the RO membrane reverse osmosis filter element 6 purifies the tap water W0 to form purified water W1, which is discharged from its clean water outlet for user use. Among them, the RO membrane reverse osmosis filter element 6 can filter and remove pollutants such as viruses, bacteria, organic matter, heavy metals, etc. in the water source.

[0029] Furthermore, the present application connects a heating pipe G2 to the clean water pipe G3 of the clean water outlet D1 of the RO membrane reverse osmosis filter element 6, and a heating device 20 is arranged on the heating pipe G2. The hot water outlet of the heating device 20 is connected to the water inlet of the booster pump 4. When the RO membrane reverse osmosis filter element 6 needs to be flushed, the heating device 20 is used to heat the water purified by the RO membrane reverse osmosis filter element 6, and the booster pump 4 draws the purified water W1 heated by the heating device 20 into the RO membrane reverse osmosis filter element 6 to circulate and flush the RO membrane reverse osmosis filter element 6. The present application uses the clean water generated by the RO membrane reverse osmosis filter element 6 to flush itself, which can reduce the secondary pollution of the RO membrane reverse osmosis filter element 6.

[0030] Furthermore, the wastewater outlet of the RO membrane reverse osmosis filter element 6 is connected to the wastewater pipe G4. When preparing purified water, the wastewater filtered and concentrated by the RO membrane reverse osmosis filter element 6 is discharged from the wastewater pipe G4; when the RO membrane reverse osmosis filter element 6 is circulated and cleaned, the cleaned wastewater is discharged from the wastewater pipe G4.

[0031] As an example, the RO membrane reverse osmosis filter element 6 can be a temperature-sensitive RO membrane reverse osmosis filter element, and the surface of the RO membrane is coated with a reverse osmosis filter element having a low critical transition temperature (LCST) temperature-sensitive polymer material. The critical transition temperature (LCST) temperature-sensitive polymer material is a polymer material that exhibits hydrophilicity when the temperature is lower than the critical transition temperature (LCST); and hydrophobicity when the temperature is higher than the critical transition temperature (LCST). In some embodiments, polymer materials such as poly N-isopropylacrylamide (PNIPAM) and its copolymers can be used, and the temperature-sensitive reverse osmosis RO membrane filter element can remove pollutants such as viruses, bacteria, organic matter, and heavy metals in water. Exemplarily, the critical transition temperature (LCST) is 45°C.

[0032] Exemplarily, the heating temperature of the heating device 20 can be set higher than the critical transition temperature (LCST), and the surface of the temperature-sensitive RO membrane reverse osmosis filter element can be washed with a higher temperature pure water source, so that the polymer material of the temperature-sensitive RO membrane reverse osmosis filter element is changed from hydrophilic to hydrophobic, which is conducive to the removal of pollutants on the membrane surface, thereby increasing the effective flow rate of the temperature-sensitive filter element membrane, improving the cleaning effect after membrane pollution, improving the anti-pollution ability of the existing reverse osmosis RO membrane filter element, increasing the service life of the reverse osmosis RO membrane filter element, reducing the frequency of core replacement, and ultimately reducing the purification cost, etc. Among them, the effective flow rate of the temperature-sensitive filter element membrane refers to the water flow rate flowing through the temperature-sensitive filter element membrane per unit time, and the unit is LMP (liters per minute).

[0033] In summary, the water purifier provided in the embodiment of the present application, by adding a heating device to the clean water outlet of the RO membrane reverse osmosis filter element, uses the heating device to heat the purified water, and then uses a booster pump to pump the heated purified water into the RO membrane reverse osmosis filter element for circulation and flushing, thereby completing the self-cleaning of the membrane, thereby improving the cleaning effect after membrane contamination, improving the anti-pollution ability, service life and pure water purification quality of the RO membrane reverse osmosis filter element, reducing the frequency of core replacement, and ultimately reducing the purification cost.

[0034] Figure 2 A schematic diagram of another RO membrane self-cleaning water purifier provided in this application. Figure 1 and Figure 2 As shown, the embodiment of the present application also provides an RO membrane self-cleaning water purifier, which includes a water inlet pipe G1, a heating pipe G2, a clean water pipe G3 and a waste water pipe G4; a booster pump 4 and an RO membrane reverse osmosis filter element 6 are arranged on the clean water pipe G3, and a heating device 20 is arranged on the heating pipe G2, and the heating device 20 includes a water storage tank 13, a heating body 16, and an exhaust valve 18; the heating body 16 is arranged in the water storage tank 13, and the exhaust valve 18 is arranged on the exhaust pipeline of the water storage tank 13; the water inlet pipe G1 is connected to the water inlet of the booster pump 4, the clean water outlet of the RO membrane reverse osmosis filter element 6 is connected to the water inlet of the water storage tank 13, the hot water outlet of the water storage tank 13 is connected to the water inlet of the booster pump 4, the waste water outlet D3 of the RO membrane reverse osmosis filter element 6 is connected to the waste water pipe G4, and the clean water outlet of the RO membrane reverse osmosis filter element 6 discharges purified water W1.

[0035] Specifically, refer to Figure 2 As shown, purified water W1 flows into the water tank 13 through the water inlet D2, the heating body 16 heats the purified water W1 in the water tank 13, the exhaust valve 18 is opened, and the steam generated by heating is discharged to the outside of the water tank 13 through the exhaust valve 18. When the RO membrane reverse osmosis filter element 6 needs to be flushed, the booster pump 4 draws the heated purified water W1 in the water tank 13 into the RO membrane reverse osmosis filter element 6 to circulate and flush the RO membrane reverse osmosis filter element 6. Among them, the material of the heating body 16 can be electric heating wire, etc.

[0036] In order to avoid the system repeatedly filling with water and repeatedly heating the flushing water source to affect the flushing efficiency, the volume of the water storage tank 13 provided in the embodiment of the present application is designed to be large enough, and optionally, the volume of the water storage tank 13 is not less than the volume of the RO membrane reverse osmosis filter element 6. With such a configuration, the capacity of the flushing water source prepared by the water storage tank 13 at one time can meet the entire flushing operation process, so the problem of water replenishment in the water storage tank 13 interrupting the flushing process during the flushing process can be avoided.

[0037] Based on the above embodiments, continue to refer to Figure 2 As shown, the heating device 20 further includes a water outlet valve 21 ; the water outlet valve 21 is arranged on the heating pipe G2 between the water storage tank 13 and the booster pump 4 .

[0038] Specifically, when the RO membrane reverse osmosis filter element 6 needs to be flushed, the water outlet valve 21 is opened, and the booster pump 4 draws the purified water W1 heated in the water tank 13 into the RO membrane reverse osmosis filter element 6 through the water outlet valve 21; when clean water is prepared, the water outlet valve 21 is closed, which can prevent the water in the water inlet pipe G1 from flowing into the water tank 13, and prevent the water in the water tank 13 from entering the RO membrane reverse osmosis filter element 6.

[0039] Based on the above embodiments, continue to refer to Figure 2 As shown, the heating device 20 further includes a water level switch 17 , which is disposed in the water tank 13 and is used to detect an upper water level H and a lower water level L of the water tank 13 .

[0040] Specific, combined Figure 2 As shown, the water level switch 17 detects the water level value in the water tank 13, and inputs the detected water level value signal to the control system of the water purifier. When the water level value of the water tank 13 is lower than the lower water level L, it means that the water tank 13 is short of water. The control system controls the RO membrane reverse osmosis filter element 6 to prepare purified water W1, and replenishes water to the water tank 13 through the heating pipe G2; when the water level value of the water tank 13 reaches the upper water level H, it means that the water tank 13 is full of water and no water replenishment is needed.

[0041] Based on the above embodiments, continue to refer to Figure 2 As shown, the heating device 20 further includes a first temperature sensor 14 and a float 15 ; the first temperature sensor 14 and the float 15 are both disposed in the water tank 13 .

[0042] For details, please refer to Figure 2 As shown, according to the critical transition temperature (LCST) of the RO membrane reverse osmosis filter element 6, the heating power of the heating body 16 is reasonably adjusted, and the clean water temperature in the water storage tank 13 is detected at any time by the first temperature sensor 14 to meet the cleaning water temperature of the RO membrane reverse osmosis filter element 6.

[0043] In some embodiments, continue to refer to Figure 2 As shown, the first temperature sensor 14 and the float 15 are both arranged at the bottom of the water tank 13, the heating body 16 is arranged on the side wall of the water tank 13, the float 15 is arranged at the bottom of the water level L under the water level switch 17, and the first temperature sensor 14 maintains a certain distance from the heating body 16, which is conducive to accurately detecting the water temperature value of the purified water W1 in the water tank 13 and the water level value in the water tank 13.

[0044] For details, please refer to Figure 2As shown, when the RO membrane reverse osmosis filter element 6 is flushed, the higher temperature flushing water after purification can easily change the polymer material of the RO membrane reverse osmosis filter element 6 from hydrophilic to hydrophobic, causing the pollutants on the membrane surface to fall off and be discharged from the water purifier from the waste water pipe G4 along with the purified water W1, completing the self-cleaning of the membrane. When the water temperature in the filter element decreases and returns to room temperature of about 25°C, the surface of the RO membrane reverse osmosis filter element 6 will change from a hydrophobic state to a hydrophilic state, and the water purifier will return to the state before normal water production, thereby realizing the self-cleaning of the RO membrane reverse osmosis filter element 6, thereby improving the service life of the water purifier and the pure water purification quality.

[0045] Based on the above embodiments, continue to refer to Figure 2 As shown, a pressure sensor 5 is arranged on the clean water pipe G3 between the booster pump 4 and the RO membrane reverse osmosis filter element 6; a flow meter 7, a pure water outlet valve 8 and a pure water outlet faucet 22 are also arranged in sequence on the clean water pipe G3 at the clean water outlet of the RO membrane reverse osmosis filter element 6; wherein, the pure water outlet faucet 22 includes a cleaning key 23 and a water making key 24.

[0046] For details, please refer to Figure 2 As shown, the pure water outlet faucet 22 is a manually or electrically controlled faucet switch, on which a water making key 24 is arranged. When preparing purified water, it is only necessary to activate the water making key 24 by pressing, touching, moving, etc., and the RO membrane reverse osmosis filter element 6 filters and prepares purified water, and the pure water outlet faucet 22 discharges purified water for users to drink.

[0047] For example, continue to refer to Figure 2 As shown, when the RO membrane reverse osmosis filter element 6 prepares purified water, the pressure sensor 5 can always detect the water flow pressure P in front of the RO membrane reverse osmosis filter element 6, and transmit the detected water flow pressure signal in the water pipeline to the control system of the water purifier. The control system calculates the increase σ=|P-P0| / P0 of the current RO membrane reverse osmosis filter element 6 membrane pressure P relative to the nominal pressure P0. When σ≥10%, it means that the pressure in front of the RO membrane reverse osmosis filter element 6 is too large, the membrane of the RO membrane reverse osmosis filter element 6 is seriously polluted, and the purified water preparation conditions are no longer met. The flushing program needs to be automatically started. The control system controls the water storage tank 13 to heat the purified water W1, the pure water outlet valve 8 is closed, the outlet valve 21 is opened, and the booster pump 4 draws the heated purified water W1 in the water storage tank 13 into the RO membrane reverse osmosis filter element 6 to circulate and flush the RO membrane reverse osmosis filter element 6.

[0048] Further, continue to refer to Figure 2 As shown, the flow meter 7 can be a liquid flow meter commonly used in ordinary pipelines. In some embodiments, the flow meter 7 can be an ultrasonic flow meter, etc., which does not need to be connected to the waterway. It measures the net water flow in the waterway pipeline based on the principle that the propagation speed of ultrasound in the flowing medium is equal to the vector sum of the average flow velocity of the measured medium and the speed of the sound wave in the static medium. It should be noted that the embodiment of the present application is attached Figure 2 The following description only takes the commonly used liquid flow meter connected to the water pipeline as an example.

[0049] For example, continue to refer to Figure 2 As shown, when the RO membrane reverse osmosis filter element 6 prepares purified water, the flowmeter 7 can always detect the purified water flow rate at the purified water outlet of the RO membrane reverse osmosis filter element 6, and transmit the purified water flow rate signal S0 detected in the water pipeline to the control system of the water purifier. The control system calculates the reduction of the purified water flow rate M at the purified water outlet of the RO membrane reverse osmosis filter element 6 relative to the nominal flow rate M0 α=|M0-M| / M0. When α≥3%, it means that the membrane of the RO membrane reverse osmosis filter element 6 is seriously polluted, the post-membrane filtered water flow rate is insufficient, and the purified water preparation conditions are no longer met. The water purifier needs to automatically start the flushing program, that is, the control system controls the water storage tank 13 to heat the purified water W1, the water inlet valve 3 and the pure water outlet valve 8 are closed, the outlet valve 21 is opened, and the booster pump 4 draws the heated purified water W1 in the water storage tank 13 into the RO membrane reverse osmosis filter element 6, and the high-temperature purified water circulates and flushes the RO membrane reverse osmosis filter element 6.

[0050] Based on the above embodiments, continue to refer to Figure 2 As shown, a scale inhibitor 10 and a wastewater valve 11 are provided on the wastewater pipe G4.

[0051] Specifically, the antiscalant 10 can effectively remove scale and prevent the formation of scale.

[0052] Reference Figure 2 As shown, when the RO membrane reverse osmosis filter element 6 prepares clean water, the outlet valve 21, the pure water outlet valve 8, and the waste water valve 11 are opened, the outlet valve 21 is closed, and the booster pump 4 pumps the tap water W0 in the water inlet pipe G1 into the RO membrane reverse osmosis filter element 6, and the RO membrane reverse osmosis filter element 6 purifies the tap water W0 to form purified water W1 that is discharged from its clean water outlet for user use; when the RO membrane reverse osmosis filter element 6 is flushed, the outlet valve 21 and the pure water outlet valve 8 are closed, the outlet valve 21 and the waste water valve 11 are opened, and the booster pump 4 draws the purified water W1 heated in the water storage tank 13 into the RO membrane reverse osmosis filter element 6 to circulate and flush the RO membrane reverse osmosis filter element 6.

[0053] Based on the above embodiments, continue to refer to Figure 2 As shown, a second temperature sensor 9 is also provided on the wastewater outlet D3 of the RO membrane reverse osmosis filter element 6 .

[0054] Specifically, when the RO membrane reverse osmosis filter element 6 is flushed, the second temperature sensor 9 is used to detect the wastewater temperature at the wastewater outlet D3 of the RO membrane reverse osmosis filter element 6 in real time, and the control system can control the flushing and soaking time of the RO membrane reverse osmosis filter element 6 with the heated purified water W1 according to the detected wastewater temperature. As an example, the reversal temperature of the RO membrane reverse osmosis filter element is 45°C. When the second temperature sensor 9 detects that the wastewater temperature at the wastewater outlet D3 of the RO membrane reverse osmosis filter element 6 is higher than or equal to 45°C, the booster pump 4 is controlled to stop working, the wastewater valve 11 is closed, and the system starts timing for 5 minutes to ensure that the flushing water source RO membrane reverse osmosis filter element is soaked for 5 minutes to ensure that the temperature-sensitive coating on the surface of the RO membrane of the RO membrane reverse osmosis filter element implements interface morphology flipping at 45°C, from a hydrophilic state to a hydrophobic state, and at this time, the pollutants on the surface of the RO membrane are easily eluted; after 5 minutes, the wastewater valve 11 is opened. 1. Restart the booster pump 4 to pump the heated purified water W1 in the water tank 13 into the RO membrane reverse osmosis filter element 6 to circulate the RO membrane reverse osmosis filter element 6; after flushing for 3 minutes, the booster pump 4 stops working, and at the same time closes the wastewater valve 11 and the outlet valve 21 to complete the self-cleaning of the membrane; when the second temperature sensor 9 detects that the wastewater temperature at the wastewater outlet D3 of the RO membrane reverse osmosis filter element 6 is lower than 45°C and returns to room temperature of about 25°C, the RO membrane surface will change from a hydrophobic state to a hydrophilic state, and the water purifier will return to the state before normal water production, and the system controls the water purifier to prepare purified water again. At this time, the system controls the water inlet valve 3 to open, the outlet valve 21 to close, the wastewater valve 11 to open, the pure water outlet valve 8 to open, the booster pump 4 to start working, and the RO membrane reverse osmosis filter element 6 automatically filters and prepares pure water.

[0055] Based on the above embodiments, continue to refer to Figure 2 As shown, a filter element 2 and a water inlet valve 3 are arranged on the water inlet pipe G1.

[0056] Exemplary, combined Figure 2 As shown, the filter element 2 can use a PP+CTO filter element, which is a superposition of a PP (polypropylene spray) filter element and a CTO (compressed activated carbon) filter element, wherein the superposition of a PP (polypropylene spray) filter element and a CTO (compressed activated carbon) filter element is adopted, the PP filter element is used to remove solid substances such as mud, rust, and algae in the water, and the CTO filter element is used to further remove residual chlorine, odor, and solid impurities in the water. When preparing purified water, the water inlet valve 3 is opened, and the water inlet pipe G1 provides tap water W0 to the purified water pipe G3.

[0057] Then, the water purifier starts to prepare pure water. The control system of the water purifier controls the water inlet valve 3 to open, the pure water outlet valve 8 to open, and the waste water valve 11 to open. The tap water W0 source is filtered by the filter element 2 and added by the booster pump 4 in front of the RO membrane reverse osmosis filter element 6, and then divided into two paths to form a cross-flow filtration system. One path is filtered by the RO membrane reverse osmosis filter element 6 and then released after passing through the pure water outlet valve 8 and the pure water outlet faucet 22 for users to drink; the other path is concentrated on the surface of the RO membrane reverse osmosis filter element 6 and then discharged by the sewage discharge module 50, completing the water purification process.

[0058] The following specifically describes the working procedure, test conditions and cleaning efficiency of the flushing detection device for the temperature-sensitive filter element provided in the embodiment of the present application.

[0059] The electrical control principle of the water purifier is as follows Figure 3 As shown, the control system consists of: a water supply port 1, a filter element 2, a water inlet valve 3, a booster pump 4, a pressure sensor 5, an RO membrane reverse osmosis filter element 6, a flow meter 7, a pure water outlet valve 8, a pure water outlet faucet 22, a cleaning key 23, a water making key 24, a water storage tank 13, a heating body 16, a water level switch 17, an exhaust valve 18, a water outlet valve 21, a first temperature sensor 14, a second temperature sensor 9, a scale inhibitor 10, a wastewater valve 11, a wastewater outlet 12 and a control system (main control board) of the water purifier.

[0060] The signal unit is composed of: a pressure sensor 5 , a flow meter 7 , a pure water outlet tap 22 , a first temperature sensor 14 , a second temperature sensor 9 , and a water level switch 17 .

[0061] The execution unit is composed of: a water inlet valve 3, a booster pump 4, a pure water outlet valve 8, a pure water outlet tap 22, a heating body 16, a water outlet valve 21, an exhaust valve 18, a waste water valve 11, and a scale inhibitor 10.

[0062] The control unit consists of: control system (main control board).

[0063] The control system of the water purifier is divided into 2 parts, as follows:

[0064] 1. Water preparation system: When the system is powered on and in standby mode, when the water preparation key 24 on the pure water outlet tap 22 is pressed, the water purifier prepares pure water according to the water preparation process described above.

[0065] 2. Heating and flushing system: When the system triggers the cleaning conditions of the water purifier as described above, the water purifier automatically cycles and cleans the RO surface.

[0066] In order to demonstrate the self-cleaning effect of the RO membrane of the water purifier, the following test conditions and test data were set:

[0067] 1. The working pressure of the RO membrane reverse osmosis filter element before the membrane is 100PSI, the recovery rate is set at 60%, and the balanced standard water production is 800G (gallons).

[0068] 2. The raw water in the water storage tank 13 is pure water, which complies with the national standard GB-34914:

[0069] The water quality index requirements are as follows:

[0070] a) The total hardness is controlled at (250±20) mg / L.

[0071] b) Alkalinity is controlled at (150±20) mg / L.

[0072] c) The conductivity is controlled at (1000±100)μS / cm.

[0073] d) The pH value is controlled between 7.0 and 7.5.

[0074] e) Temperature control at 25±1℃.

[0075] 3. Flux recovery rate (cleaning efficiency): (effective flow after cleaning / initial flow of initial equilibrium) %.

[0076] 4. When the water production of the RO membrane reverse osmosis filter reaches 4000L, take the water production flow rate as the initial balance flow rate LMP as the reference data. The flow rate unit is LMP (liters per minute).

[0077] Table 1 Test data

[0078]

[0079] Referring to the results analysis in Table 1, the water purifier provided in the embodiment of the present application has a cleaning efficiency of more than 84% under the cleaning parameters of a temperature of 45°C, a filter element immersion for 5 minutes, a water pressure of 0.24 MPa, and a flushing for 3 minutes. It has a high cleaning efficiency, can improve the cleaning effect of the temperature-sensitive filter element, and is conducive to controlling and reducing cleaning costs.

[0080] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A RO membrane self-cleaning water purifier, comprising a water inlet pipe (G1), a heating pipe (G2), a clean water pipe (G3) and a waste water pipe (G4); characterized in that: The water purification pipe (G3) is provided with a booster pump (4) and an RO membrane reverse osmosis filter element (6), and the heating pipe (G2) is provided with a heating device (20); The water inlet pipe (G1) is connected to the water inlet of the booster pump (4), the clean water outlet of the RO membrane reverse osmosis filter element (6) is connected to the water inlet of the heating device (20), the hot water outlet of the heating device (20) is connected to the water inlet of the booster pump (4), the waste water outlet of the RO membrane reverse osmosis filter element (6) is connected to the waste water pipe (G4), and the clean water outlet of the RO membrane reverse osmosis filter element (6) discharges purified water; The heating device (20) is used to contain and heat purified water; the booster pump (4) is used to pump water in the water inlet pipe (G1) into the RO membrane reverse osmosis filter element (6) for purification, and is also used to pump purified water heated by the heating device (20) into the RO membrane reverse osmosis filter element (6) for circulating flushing.

2. The water purifier according to claim 1, characterized in that: The heating device (20) comprises a water storage tank (13), a heating body (16), and an exhaust valve (18); the heating body (16) is arranged in the water storage tank (13), and the exhaust valve (18) is arranged on the exhaust pipeline of the water storage tank (13).

3. The water purifier according to claim 2, characterized in that: The volume of the water storage tank (13) is not less than the volume of the RO membrane reverse osmosis filter element (6).

4. The water purifier according to claim 2, characterized in that: The heating device (20) further comprises a water outlet valve (21); the water outlet valve (21) is arranged on the heating pipe (G2) between the water storage tank (13) and the booster pump (4).

5. The water purifier according to claim 2, characterized in that: The heating device (20) further comprises a water level switch (17), wherein the water level switch (17) is arranged in the water storage tank (13) and is used to detect an upper water level H and a lower water level L of the water storage tank (13).

6. The water purifier according to claim 2, characterized in that: The heating device (20) further comprises a first temperature sensor (14) and a floating ball (15); the first temperature sensor (14) and the floating ball (15) are both arranged in the water storage tank (13).

7. The water purifier according to claim 1, characterized in that: A pressure sensor (5) is provided on the clean water pipe (G3) between the booster pump (4) and the RO membrane reverse osmosis filter element (6); A flow meter (7), a pure water outlet valve (8) and a pure water outlet tap (22) are also sequentially arranged on the pure water pipe (G3) at the pure water outlet of the RO membrane reverse osmosis filter element (6); Wherein, the pure water outlet tap (22) comprises a cleaning key (23) and a water making key (24).

8. The water purifier according to claim 1, characterized in that: The wastewater pipe (G4) is provided with a scale inhibitor (10) and a wastewater valve (11).

9. The water purifier according to claim 1, characterized in that: A second temperature sensor (9) is also provided on the wastewater outlet of the RO membrane reverse osmosis filter element (6).

10. The water purifier according to claim 1, characterized in that: The water inlet pipe (G1) is provided with a filter element (2) and a water inlet valve (3).

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