Pressureless tankless reverse osmosis stepping water boiler and control method thereof

Abstract

The application discloses a pressure tank-free reverse osmosis stepping boiled water device, which comprises a foreign matter removing assembly, a reverse osmosis assembly and a waste water circulating assembly. The foreign matter removing assembly is used for filtering impurities in tap water. The reverse osmosis assembly comprises a reverse osmosis processor and a first TDS detecting piece, the reverse osmosis processor is communicated with the foreign matter removing assembly, and the first TDS detecting piece is distributed downstream of the reverse osmosis processor and communicated with the reverse osmosis processor. The waste water circulating assembly comprises a first waste water electromagnetic valve, a second waste water electromagnetic valve and a second TDS detecting piece, the second TDS detecting piece is distributed downstream of the reverse osmosis processor and communicated with the reverse osmosis processor, the first waste water electromagnetic valve is distributed downstream of the second TDS detecting piece and communicated with the second TDS detecting piece, an input end of the second waste water electromagnetic valve is communicated between the second TDS detecting piece and the first waste water electromagnetic valve, and an output end of the second waste water electromagnetic valve is communicated between the foreign matter removing assembly and the reverse osmosis processor. The application has the effects of improving water resource recycling rate and reducing waste water discharge.

Description

Technical Field

[0001] This application relates to the field of water treatment equipment technology, and in particular to a pressureless reverse osmosis step-by-step water boiler and its control method. Background Technology

[0002] The pressureless tankless reverse osmosis step-by-step water heater is a commercial drinking water equipment that integrates water purification and filtration with instant heating. It is widely used in public places such as office buildings, schools, hospitals, restaurants, and stations. After filtration and purification of municipal tap water through multiple stages, the pure water is heated to boiling by the heating module, providing users with safe, hygienic, and readily available drinking pure water and boiled water. It is one of the mainstream equipment in the current commercial direct drinking water field.

[0003] Existing pressureless reverse osmosis step-by-step water heaters typically pre-filter tap water using PP cotton filters, pre-activated carbon filters, and post-activated carbon filters to remove sediment, residual chlorine, and large organic particles. The water is then further filtered by an RO reverse osmosis membrane. After RO filtration, two streams of water are produced: one stream is pure water, with most dissolved salts and heavy metals removed, which is safe to drink directly; the other stream is concentrated water, enriched with salts and impurities, which is discharged directly into the sewer system.

[0004] However, existing tankless reverse osmosis step-by-step water boilers have certain drawbacks. Since the recovery rate of RO membranes is typically only 25%–30%, 2–3 liters of concentrate are discharged for every 1 liter of pure water produced. Over long periods of operation, this results in a large volume of concentrate. This concentrate is directly discharged as wastewater, causing a serious waste of water resources and increasing water costs for users, leading to long-term economic losses. How to solve these technical problems is a question that those skilled in the art need to consider. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a pressureless reverse osmosis step-by-step water boiler and its control method.

[0006] The pressureless reverse osmosis step-by-step water boiler includes a purification component, a reverse osmosis component, and a wastewater circulation component. The purification component filters impurities from tap water. The reverse osmosis component includes a reverse osmosis processor and a first TDS detector. The reverse osmosis processor is connected to the purification component, and the first TDS detector is located downstream of the reverse osmosis processor and connected to it, used to detect the TDS value of the pure water. The wastewater circulation assembly includes a first wastewater solenoid valve, a second wastewater solenoid valve, and a second TDS detector. The second TDS detector is located downstream of the reverse osmosis processor and is connected to it, used to detect the TDS value of the wastewater. The first wastewater solenoid valve is located downstream of the second TDS detector and is connected to it. The input end of the second wastewater solenoid valve is connected between the second TDS detector and the first wastewater solenoid valve, and the output end of the second wastewater solenoid valve is connected between the impurity removal assembly and the reverse osmosis processor. When the second TDS detector detects a TDS value in the wastewater that is greater than a preset TDS value, the first wastewater solenoid valve opens and the second wastewater solenoid valve closes, discharging the wastewater. When the second TDS detector detects a TDS value in the wastewater that is less than the preset TDS value, the first wastewater solenoid valve closes and the second wastewater solenoid valve opens, allowing the wastewater to flow repeatedly through the reverse osmosis processor.

[0007] Understandably, the pressureless reverse osmosis step-by-step water boiler filters impurities such as sediment, residual chlorine, and large organic particles from tap water through its impurity removal components, providing a water quality foundation for subsequent reverse osmosis treatment. The pre-filtered water undergoes further filtration by the reverse osmosis processor, and the first TDS detector measures the TDS value of the pure water to determine if it meets the effluent standards. The second TDS detector measures the TDS value of the wastewater to detect the concentration of salt and impurities. When the detected TDS value of the wastewater exceeds the preset TDS value, it indicates a high concentration of salt and impurities, limiting its value for recirculation and filtration. In this case, the first wastewater solenoid valve opens, the second wastewater solenoid valve closes, and the wastewater is discharged through the first wastewater solenoid valve. When the TDS value of the wastewater is detected to be lower than the preset TDS value, it indicates that the concentration of salt and impurities in this part of the wastewater is low, and the wastewater still has room for further filtration and reuse. At this time, the first wastewater solenoid valve is closed and the second wastewater solenoid valve is opened, so that this part of the wastewater flows back to the impurity removal component and the reverse osmosis processor through the second wastewater solenoid valve, mixes with tap water, and then flows through the reverse osmosis processor for secondary reverse osmosis filtration.

[0008] In one embodiment, the reverse osmosis assembly further includes a reflux solenoid valve, the input of which is connected downstream of the first TDS detector, and the output of which is connected between the impurity removal assembly and the reverse osmosis processor.

[0009] Understandably, the output of the reflux solenoid valve is connected to the inlet pipe between the impurity removal component and the reverse osmosis processor, and the input is connected to the downstream pipe of the first TDS detector. This creates a controlled reflux channel between the pure water side and the inlet side of the reverse osmosis processor. When the first TDS detector detects that the TDS value of the pure water produced by the reverse osmosis processor does not meet the preset TDS value requirement, this portion of pure water can be returned to the area between the impurity removal component and the reverse osmosis processor via the reflux solenoid valve. After mixing with tap water, it re-enters the reverse osmosis processor for filtration, thereby reducing the TDS value on the pure water side.

[0010] In one embodiment, the impurity removal component includes an interception impurity removal element, a first adsorption impurity removal element, and a second adsorption impurity removal element. The input end of the interception impurity removal element is connected to the inlet, and the output end of the interception impurity removal element is connected to the upstream of the reverse osmosis processor. The input end of the first adsorption impurity removal element is connected to the output end of the interception impurity removal element, and the output end of the first adsorption impurity removal element is connected to the input end of the reverse osmosis processor. The input end of the second adsorption impurity removal element is connected to the output end of the first adsorption impurity removal element, and the output end of the second adsorption impurity removal element is connected to the input end of the reverse osmosis processor.

[0011] Understandably, tap water first passes through an interceptor connected to the inlet to remove large physical impurities such as sediment and rust. Then, it passes through a first adsorption unit connected to the interceptor to remove residual chlorine and some organic matter. Finally, it passes through a second adsorption unit connected to the first adsorption unit to remove remaining residual chlorine and odor-causing substances before being sent to the reverse osmosis processor. This step-by-step pretreatment structure gradually reduces the physical impurities and chemical pollutants in the water entering the reverse osmosis processor.

[0012] In one embodiment, the impurity removal component further includes a third adsorption impurity removal element, which is distributed downstream of the first TDS detector and communicates with the first TDS detector.

[0013] Understandably, in this embodiment, a third adsorption and impurity removal device is added downstream of the first TDS detector. This allows the pure water, after being filtered by the reverse osmosis processor and having its TDS value determined to be qualified by the first TDS detector, to undergo post-adsorption treatment again through the third adsorption and impurity removal device to further remove any trace amounts of odorous substances and volatile organic compounds that may remain in the pure water.

[0014] In one embodiment, the impurity removal component further includes an NTC detector and a third TDS detector. The input end of the NTC detector is connected to the interception and impurity removal component, and the output end of the NTC detector is connected to the first adsorption and impurity removal component. The input end of the third TDS detector is connected to the output end of the NTC detector, and the output end of the third TDS detector is connected to the input end of the reverse osmosis processor.

[0015] Understandably, the NTC sensor can collect real-time water temperature data after the impurity removal process and before the adsorption process, preventing water with abnormal temperatures from entering subsequent adsorption and reverse osmosis stages and affecting the treatment effect. The third TDS sensor detects the TDS value of the incoming water before it enters the reverse osmosis processor, indicating the background salinity of the tap water after the impurity removal process, providing a reference for the water quality of the pressureless reverse osmosis step-by-step water heater.

[0016] In one embodiment, the pressureless reverse osmosis step-by-step water boiler further includes a containment component, which includes a pure water tank and a hot water tank. The pure water tank is located downstream of the third adsorption and impurity removal element and is connected to the third adsorption and impurity removal element; the hot water tank is located downstream of the pure water tank and is connected to the pure water tank.

[0017] Understandably, the pure water tank is used to store pure water that has undergone reverse osmosis filtration and post-adsorption treatment by the third adsorption unit, while the hot water tank is used to heat the pure water supplied from the pure water tank. The pure water tank and the hot water tank enable the pressureless reverse osmosis step-by-step water heater to simultaneously supply both ambient temperature pure water and heated water.

[0018] In one embodiment, the pressureless reverse osmosis step-by-step water boiler further includes a water pump assembly, which includes a booster pump and a pump. The input end of the booster pump is connected to the output end of the second adsorption and impurity removal element, and the output end of the booster pump is connected to the input end of the reverse osmosis processor. The input end of the pump is connected to the pure water tank, and the output end of the pump is connected to the hot water tank. The pressureless reverse osmosis step-by-step water boiler also includes a valve assembly, which includes an inlet solenoid valve, a pure water tank valve, a hot water tank valve, an empty solenoid valve, a water exchange solenoid valve, a hot water outlet valve, and a normal temperature outlet valve. The input end of the inlet solenoid valve is connected to the output end of the interception and impurity removal component, and the output end of the inlet solenoid valve is connected to the input end of the first adsorption and impurity removal component. The input end of the pure water tank valve is connected to the output end of the third adsorption and impurity removal component. The input end of the hot water tank valve is connected to the output end of the water pump, and the output end of the hot water tank valve is connected to the hot water tank. The empty solenoid valve, the hot water outlet valve, and the water exchange solenoid valve are all connected to the hot water tank. The normal temperature outlet valve is connected between the water pump and the hot water tank valve, and the check valve is connected between the output end of the impurity removal component and the output end of the return solenoid valve.

[0019] Understandably, the booster pump in the water pump assembly, connected at both ends to the second adsorption and impurity removal component and the reverse osmosis processor respectively, pressurizes the adsorbed tap water and sends it to the reverse osmosis processor to ensure that the reverse osmosis membrane operates at the required working pressure. The valve assembly includes an inlet solenoid valve between the interception and impurity removal component and the first adsorption and impurity removal component to control the inlet water flow; a pure water tank valve between the third adsorption and impurity removal component and the pure water tank to control the pure water inlet flow; a hot water tank valve between the pump and the hot water tank to control the hot water tank replenishment; an emptying solenoid valve and a water exchange solenoid valve connected to the hot water tank to handle the emptying and water exchange functions respectively; a hot water outlet valve connected to the hot water tank to handle hot water intake; and a room temperature outlet valve connected between the pump and the hot water tank valve to handle room temperature pure water intake. This system assigns specific functions to the corresponding valves for inlet water, pressurization, filtration, storage, replenishment, emptying, water exchange, room temperature water intake, and hot water intake, facilitating the control system's independent start and stop of each function.

[0020] In one embodiment, the control method of the pressureless reverse osmosis step-by-step water boiler includes the following steps: Step S1: Activate the second TDS detector to detect the TDS value of the wastewater; when the second TDS detector detects that the TDS value of the wastewater is greater than the preset TDS value of the wastewater, open the first wastewater solenoid valve and close the second wastewater solenoid valve to discharge the wastewater through the first wastewater solenoid valve. Step S2: When the TDS value of the wastewater detected by the second TDS detector is less than the preset TDS value of the wastewater, close the first wastewater solenoid valve and open the second wastewater solenoid valve, so that the wastewater and tap water are mixed and repeatedly flow through the reverse osmosis processor before flowing to the first TDS detector.

[0021] Understandably, this control method first activates the second TDS detector in step S1 to obtain the actual TDS value of the wastewater discharged from the reverse osmosis processor, using this actual TDS value as the basis for determining wastewater branch treatment. When the determination result shows that the TDS value of the wastewater is higher than the preset value, it indicates that the salt and impurity concentration in the wastewater is too high. The first wastewater solenoid valve is then opened and the second wastewater solenoid valve is closed, allowing this portion of wastewater to be directly discharged through the first wastewater solenoid valve. In step S2, when the determination result shows that the TDS value of the wastewater is lower than the preset value, it indicates that this portion of wastewater needs re-filtration. The first wastewater solenoid valve is then closed and the second wastewater solenoid valve is opened, allowing this portion of wastewater to flow back through the second wastewater solenoid valve and mix with tap water before re-entering the reverse osmosis processor. The purified water obtained from the secondary filtration is then sent to the first TDS detector for the next stage of determination.

[0022] In one embodiment, step S2 specifically includes the following steps: Step S21: When the TDS value of the wastewater detected by the second TDS detector is less than the preset TDS value of the wastewater, the first wastewater solenoid valve is closed and the second wastewater solenoid valve is opened. Step S22: After the wastewater and tap water are mixed, they flow through the reverse osmosis processor and then to the first TDS detector; when the first TDS detector detects that the pure water TDS value of the mixed water is less than the preset TDS value of the pure water, the reflux solenoid valve is closed and the pure water flows to the third adsorption and impurity removal unit. Step S23: When the TDS value of the pure water in the mixed water is greater than the preset TDS value of the pure water detected by the first TDS detector, the reflux solenoid valve is opened, and the mixed water flows back to the reverse osmosis processor after mixing with the tap water.

[0023] Understandably, in S21, based on the premise that the wastewater TDS value is lower than the preset TDS value, the first wastewater solenoid valve is closed and the second wastewater solenoid valve is opened to establish a wastewater return channel. In S22, the wastewater mixes with tap water through the return channel and flows through the reverse osmosis processor for secondary filtration. The first TDS detector determines the pure water TDS value of the mixed water obtained from the secondary filtration. If the TDS value is lower than the preset TDS value of pure water, the return solenoid valve is closed, allowing the pure water to flow directly to the third adsorption and impurity removal unit for further post-adsorption treatment. In S23, if the first TDS detector detects that the pure water TDS value of the mixed water is higher than the preset TDS value of pure water, the return solenoid valve is opened, allowing the portion of mixed water that has not yet met the standard to flow back to the inlet side of the reverse osmosis processor and mix with tap water for further filtration. Wastewater recycling is achieved by switching the solenoid valve on the wastewater side, and the pure water side is calibrated in real time by the return solenoid valve during the recycling process. This allows the wastewater circulation and pure water return to work together to promote wastewater recycling while improving water quality.

[0024] In one embodiment, step S23 includes: S231: Compare the TDS value of the pure water in the mixed water measured by the first TDS detector with the preset TDS value of the pure water; S232: When the TDS value of the pure water in the mixed water is detected by the first TDS detector to be greater than the preset TDS value of the pure water, the second wastewater solenoid valve is closed and the first wastewater solenoid valve is opened to discharge the mixed wastewater. S233: The system continues to operate when the TDS value of the pure water in the mixed water is less than the preset TDS value of the pure water detected by the first TDS detector.

[0025] Understandably, in S232, if the first TDS detector detects that the TDS value of the purified water obtained after re-filtration is still higher than the preset TDS value for purified water, it indicates that this portion of the mixed water still cannot meet the standard after multiple cycles of filtration, and continued circulation has no actual filtration gain. Therefore, the second wastewater solenoid valve is closed, and the first wastewater solenoid valve is opened to discharge the corresponding mixed water wastewater. By setting an upper limit judgment condition for the reflux filtration result, the system avoids the long-term repeated circulation of mixed water that cannot meet the standard, thus reducing the burden on the reverse osmosis membrane. In S233, if the first TDS detector detects that the TDS value of the purified water obtained after re-filtration has dropped below the preset TDS value for purified water, the purified water flows to the third adsorption and impurity removal unit to enter the post-adsorption stage. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the main impurity removal components of the pressureless reverse osmosis step-by-step water boiler provided in this application embodiment.

[0027] Figure 2 This is a schematic diagram showing the main components of the pressureless reverse osmosis step-by-step water boiler provided in this application embodiment.

[0028] Figure 3 This is a schematic diagram of the structure of the pressureless reverse osmosis step-by-step water boiler provided in the embodiments of this application.

[0029] Figure 4 yes Figure 3 A magnified view of part A in the middle.

[0030] Figure 5 This is a water circuit diagram of the pressureless reverse osmosis step-by-step water boiler provided in the embodiments of this application.

[0031] Figure 6 yes Figure 5 A magnified view of part B in the middle section.

[0032] Figure 7 yes Figure 5 A magnified view of part C in the middle.

[0033] Figure 8 yes Figure 5 A magnified view of part D in the middle.

[0034] Figure 9 yes Figure 5 A magnified view of part E in the middle.

[0035] Figure 10 yes Figure 5 A magnified view of part F in the middle section.

[0036] Figure 11 yes Figure 5 A magnified view of part G in the middle.

[0037] Explanation of reference numerals in the attached figures: 1. Impurity Removal Component; 11. Interception Impurity Removal Component; 12. First Adsorption Impurity Removal Component; 13. Second Adsorption Impurity Removal Component; 14. Third Adsorption Impurity Removal Component; 15. NTC Detector; 16. Third TDS Detector; 2. Reverse Osmosis Component; 21. Reverse Osmosis Processor; 22. First TDS Detector; 23. Reflux Solenoid Valve; 3. Wastewater Circulation Component; 31. First Wastewater Solenoid Valve; 32. Second Wastewater Solenoid Valve; 33. Second TDS Detector; 4. Reception Component; 41. Pure water tank; 411. Pure water tank level probe; 42. Hot water tank; 421. Heating element; 422. Hot water tank level probe; 423. Hot water tank temperature probe; 5. Water pump assembly; 51. Booster pump; 52. Water pump; 6. Valve assembly; 61. Inlet solenoid valve; 62. Pure water tank valve; 63. Hot water tank valve; 64. Drain solenoid valve; 65. Water exchange solenoid valve; 66. Hot water outlet valve; 67. Normal temperature outlet valve; 68. Check valve; 7. Control components. Detailed Implementation

[0038] The following combination Figures 1 to 11 This application will be described in further detail below.

[0039] Example 1: In one embodiment, the pressureless reverse osmosis step-by-step water boiler includes a purification component 1, a reverse osmosis component 2, and a wastewater circulation component 3. The purification component 1 is used to filter impurities from tap water. The reverse osmosis component 2 includes a reverse osmosis processor 21 and a first TDS detector 22. The reverse osmosis processor 21 is connected to the purification component 1, and the first TDS detector 22 is located downstream of the reverse osmosis processor 21 and is connected to the reverse osmosis processor 21, and is used to detect the TDS value of pure water. The wastewater circulation component 3 includes a first wastewater solenoid valve 31, a second wastewater solenoid valve 32, and a second TDS detector 33. The second TDS detector 33 is located downstream of the reverse osmosis processor 21 and is connected to the reverse osmosis processor 21. It is used to detect the TDS value of the wastewater. The first wastewater solenoid valve 31 is located downstream of the second TDS detector 33 and is connected to the second TDS detector 33. The input end of the second wastewater solenoid valve 32 is connected between the second TDS detector 33 and the first wastewater solenoid valve 31. The output end of the second wastewater solenoid valve 32 is connected between the impurity removal component 1 and the reverse osmosis processor 21. When the second TDS detector 33 detects that the TDS value of the wastewater is greater than the preset TDS value of the wastewater, the first wastewater solenoid valve 31 opens and the second wastewater solenoid valve 32 closes, discharging the wastewater. When the second TDS detector 33 detects that the TDS value of the wastewater is less than the preset TDS value of the wastewater, the first wastewater solenoid valve 31 closes and the second wastewater solenoid valve 32 opens, and the wastewater flows repeatedly through the reverse osmosis processor 21.

[0040] In this embodiment, refer to Figure 1, Figure 4 and Figure 8 TDS stands for Total Dissolved Solids, and the preset threshold for wastewater can be selected within the range of 550 mg / L to 850 mg / L. The tap water inlet is located below the reverse osmosis processor 21, and the impurity removal component 1 is sandwiched between the tap water inlet and the reverse osmosis processor 21. The reverse osmosis processor 21 can use an RO reverse osmosis membrane. The inlet of the reverse osmosis processor 21 is connected to the outlet of the impurity removal component 1 via a pipeline. The reverse osmosis processor 21 has a pure water outlet and a wastewater outlet. Both the first TDS detection element 22 and the second TDS detection element 33 can be TDS probes. The first wastewater solenoid valve 31 and the second wastewater solenoid valve 32 can be solenoid valves of the same model.

[0041] The pressureless reverse osmosis step-by-step water boiler filters impurities such as sediment, residual chlorine, and large organic particles from tap water through the impurity removal component 1, providing a water quality foundation for subsequent reverse osmosis treatment. The pre-filtered water undergoes further filtration through the reverse osmosis processor 21, and the TDS value of the pure water side is detected by the first TDS detector 22 to determine whether the pure water meets the effluent standard. The second TDS detector 33 is used to detect the TDS value of wastewater to determine the concentration of salt and impurities in the wastewater. When the detected wastewater TDS value is greater than the preset TDS value, it indicates that the concentration of salt and impurities in the wastewater is high, and its reuse value for recirculation filtration is limited. At this time, the first wastewater solenoid valve 31 opens and the second wastewater solenoid valve 32 closes, and the wastewater is discharged through the first wastewater solenoid valve 31. When the TDS value of the wastewater is detected to be lower than the preset TDS value, it indicates that the concentration of salt and impurities in this part of the wastewater is low, and the wastewater can still be filtered and reused. At this time, the first wastewater solenoid valve 31 is closed and the second wastewater solenoid valve 32 is opened, so that this part of the wastewater flows back to the impurity removal component 1 and the reverse osmosis processor 21 through the second wastewater solenoid valve 32, mixes with tap water, and then flows through the reverse osmosis processor 21 for secondary reverse osmosis filtration.

[0042] In one embodiment, the reverse osmosis assembly 2 further includes a reflux solenoid valve 23, the input end of which is connected to the downstream of the first TDS detector 22, and the output end of which is connected between the impurity removal assembly 1 and the reverse osmosis processor 21.

[0043] In this embodiment, refer to Figure 1 , Figure 4 , Figure 8 and Figure 9The reflux solenoid valve 23 can be a solenoid valve of the same model as the first wastewater solenoid valve 31 and the second wastewater solenoid valve 32. The inlet end of the reflux solenoid valve 23 is connected to the pure water pipeline downstream of the first TDS detection element 22 via the reflux pipeline. The output end of the reflux solenoid valve 23 is connected to the impurity removal component 1 and the reverse osmosis processor 21 via the pipeline. The output end of the reflux solenoid valve 23 is connected upstream of the access position of the reflux branch of the second wastewater solenoid valve 32.

[0044] The output end of the reflux solenoid valve 23 is connected to the inlet pipe between the impurity removal component 1 and the reverse osmosis processor 21, and the input end is connected to the downstream pipe of the first TDS detector 22, thereby creating a controlled reflux channel between the pure water side and the inlet water side of the reverse osmosis processor 21. When the first TDS detector 22 detects that the TDS value of the pure water produced by the reverse osmosis processor 21 does not meet the preset TDS value requirement, this portion of pure water can be returned to the impurity removal component 1 and the reverse osmosis processor 21 via the reflux solenoid valve 23, mixed with tap water, and then re-enter the reverse osmosis processor 21 for filtration, thereby reducing the TDS value on the pure water side.

[0045] In one embodiment, the impurity removal component 1 includes an interception impurity removal element 11, a first adsorption impurity removal element 12, and a second adsorption impurity removal element 13. The input end of the interception impurity removal element 11 is connected to the water inlet, and the output end of the interception impurity removal element 11 is connected to the upstream of the reverse osmosis processor 21. The input end of the first adsorption impurity removal element 12 is connected to the output end of the interception impurity removal element 11, and the output end of the first adsorption impurity removal element 12 is connected to the input end of the reverse osmosis processor 21. The input end of the second adsorption impurity removal element 13 is connected to the output end of the first adsorption impurity removal element 12, and the output end of the second adsorption impurity removal element 13 is connected to the input end of the reverse osmosis processor 21.

[0046] In this embodiment, refer to Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 The impurity removal element 11 can be a PP cotton filter cartridge, the first adsorption impurity removal element 12 can be a pre-activated carbon filter, and the second adsorption impurity removal element 13 can be a centrally activated carbon filter. The impurity removal element 11, the first adsorption impurity removal element 12, and the second adsorption impurity removal element 13 are connected in series along the flow direction of the tap water. The impurity removal element 11, the first adsorption impurity removal element 12, and the second adsorption impurity removal element 13 are each filled into a columnar structure, and all three columnar structures are arranged horizontally.

[0047] Tap water first passes through an interception and impurity removal unit 11 connected to the inlet to intercept large physical impurities such as silt and rust. Then, it passes through a first adsorption and impurity removal unit 12 connected to the interception and impurity removal unit 11 to adsorb residual chlorine and some organic matter in the water. Finally, it passes through a second adsorption and impurity removal unit 13 connected to the first adsorption and impurity removal unit 12 to adsorb the remaining residual chlorine and odor substances before being sent to the reverse osmosis processor 21. Through this progressively staged pretreatment structure, the physical impurities and chemical pollutants in the water entering the reverse osmosis processor 21 are gradually reduced.

[0048] In one embodiment, the impurity removal component 1 further includes an NTC detector 15 and a third TDS detector 16. The input end of the NTC detector 15 is connected to the interception and impurity removal component 11, and the output end of the NTC detector 15 is connected to the first adsorption and impurity removal component 12. The input end of the third TDS detector 16 is connected to the NTC detector 15, and the output end of the third TDS detector 16 is connected to the reverse osmosis processor 21.

[0049] In this embodiment, refer to Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 and Figure 9 NTC stands for Negative Temperature Coefficient. NTC detection element 15 can be an NTC temperature sensor. The third TDS detection element 16 can be the same TDS probe as the first TDS detection element 22 and the second TDS detection element 33.

[0050] The NTC sensor 15 can collect the water temperature in real time after the interception and impurity removal process and before the adsorption and impurity removal process, preventing water with abnormal temperature from entering the subsequent adsorption and reverse osmosis stages and affecting the treatment effect. The third TDS sensor 16 detects the TDS value of the incoming water that is about to enter the reverse osmosis processor 21, which is used to display the background salinity of the tap water after the interception and impurity removal device 11, and provides a reference for the water quality of the pressureless reverse osmosis step-by-step water heater.

[0051] In one embodiment, the impurity removal component 1 further includes a third adsorption impurity removal element 14, which is distributed downstream of the first TDS detector 22 and communicates with the first TDS detector 22.

[0052] In this embodiment, refer to Figure 3 , Figure 4 , Figure 7 and Figure 9 The third adsorption and impurity removal element 14 can be a post-activated carbon. The third adsorption and impurity removal element 14 is arranged in a columnar structure and is horizontally arranged below the interception and impurity removal element 11, the first adsorption and impurity removal element 12 and the second adsorption and impurity removal element 13.

[0053] In this embodiment, a third adsorption and impurity removal device 14 is added downstream of the first TDS detector 22. The pure water that has been filtered by the reverse osmosis processor 21 and whose TDS value is determined to be qualified by the first TDS detector 22 is then subjected to post-adsorption treatment by the third adsorption and impurity removal device 14 to further remove any trace odor substances and volatile organic compounds that may remain in the pure water.

[0054] In one embodiment, the pressureless reverse osmosis step-by-step water boiler further includes a housing component 4, which includes a pure water tank 41 and a hot water tank 42. The pure water tank 41 is located downstream of the third adsorption and impurity removal component 14 and is connected to the third adsorption and impurity removal component 14; the hot water tank 42 is located downstream of the pure water tank 41 and is connected to the pure water tank 41.

[0055] In this embodiment, refer to Figure 2 , Figure 4 , Figure 10 and Figure 11 The pure water tank 41 can be a 10-liter stainless steel storage tank, and the hot water tank 42 can be a 40-liter stainless steel heating water tank. The pure water tank 41 is located in the middle of the tank frame of the tankless reverse osmosis step-by-step water heater. A water level probe is installed inside the pure water tank 41 to detect its water level. One end of the pure water tank 41 is connected to the outlet of the third adsorption and impurity removal component 14 via a pipe, and the other end is connected to the hot water tank 42 via a pipe. The hot water tank 42 is located at the top of the tankless reverse osmosis step-by-step water heater frame, and a water level probe is installed inside the hot water tank 42 to detect its water level.

[0056] The pure water tank 41 is used to store pure water that has been filtered by reverse osmosis and then post-adsorbed by the third adsorption removal element 14. The hot water tank 42 is used to heat the pure water fed into the pure water tank 41. The pure water tank 41 and the hot water tank 42 enable the pressureless reverse osmosis step-by-step water heater to simultaneously supply both room temperature pure water and heated hot water.

[0057] In one embodiment, the pressureless reverse osmosis step-by-step water boiler further includes a water pump assembly 5, which includes a booster pump 51 and a pump 52. The input end of the booster pump 51 is connected to the output end of the second adsorption and impurity removal component 13, and the output end of the booster pump 51 is connected to the input end of the reverse osmosis processor 21. The input end of the pump 52 is connected to the pure water tank 41, and the output end of the pump 52 is connected to the hot water tank 42. The pressureless reverse osmosis step-by-step water boiler also includes a valve assembly 6, which comprises an inlet solenoid valve 61, a pure water tank valve 62, a hot water tank valve 63, an emptying solenoid valve 64, a water exchange solenoid valve 65, a hot water outlet valve 66, and a normal temperature outlet valve 67. The input end of the inlet solenoid valve 61 is connected to the output end of the interception and impurity removal component 11, and the output end of the inlet solenoid valve 61 is connected to the input end of the first adsorption and impurity removal component 12; the input end of the pure water tank valve 62 is connected to the input end of the third adsorption and impurity removal component 14. The output terminals are connected: the output terminal of the pure water tank valve 62 is connected to the pure water tank 41; the input terminal of the hot water tank valve 63 is connected to the output terminal of the water pump 52, and the output terminal of the hot water tank valve 63 is connected to the hot water tank 42; the venting solenoid valve 64, the hot water outlet valve 66, and the water exchange solenoid valve 65 are all connected to the hot water tank 42; the ambient temperature outlet valve 67 is connected between the water pump 52 and the hot water tank valve 63; and the one-way valve 68 is connected between the output terminal of the impurity removal component 1 and the output terminal of the return solenoid valve 23.

[0058] In this embodiment, refer to Figures 1 to 11 The inlet of booster pump 51 is connected to the outlet of the second adsorption and impurity removal component 13 via a pipeline, and the outlet of booster pump 51 is connected to the inlet of reverse osmosis processor 21 via a pipeline. The inlet of water pump 52 is connected to the outlet of pure water tank 41 via a pipeline, and the outlet of water pump 52 delivers pure water to hot water tank 42 via a pipeline. Inlet solenoid valve 61 is installed on the inlet pipeline between the interception and impurity removal component 11 and the first adsorption and impurity removal component 12. The inlet of inlet solenoid valve 61 is connected to the interception and impurity removal component 11, and the outlet of inlet solenoid valve 61 is connected to the first adsorption and impurity removal component 12. Pure water tank valve 62 is installed on the pipeline between the third adsorption and impurity removal component 14 and pure water tank 41. The inlet of pure water tank valve 62 is connected to the third adsorption and impurity removal component 14, and the outlet of pure water tank valve 62 is connected to pure water tank 41. Hot water tank valve 63 is installed on the pipeline between water pump 52 and hot water tank 42. The inlet end of hot water tank valve 63 is connected to water pump 52, and the outlet end of hot water tank valve 63 is connected to hot water tank 42. Drain solenoid valve 64 and water exchange solenoid valve 65 are respectively connected to the bottom of hot water tank 42. Hot water outlet valve 66 is connected to the outlet pipeline of hot water tank 42, and normal temperature water outlet valve 67 is connected to the pipeline between water pump 52 and hot water tank valve 63.

[0059] The booster pump 51, connected at both ends to the second adsorption and impurity removal component 13 and the reverse osmosis processor 21 respectively in the water pump assembly 5, pressurizes the adsorbed tap water and sends it into the reverse osmosis processor 21 to ensure that the reverse osmosis membrane operates at the required working pressure. The valve assembly 6 includes an inlet solenoid valve 61 located between the interception and impurity removal component 11 and the first adsorption and impurity removal component 12 to control the system's water inlet flow; a pure water tank valve 62 located between the third adsorption and impurity removal component 14 and the pure water tank 41 to control the pure water inlet flow; a hot water tank valve 63 located between the pump 52 and the hot water tank 42 to control the hot water tank 42 replenishment; an empty solenoid valve 64 and a water exchange solenoid valve 65 connected to the hot water tank 42 respectively handle the emptying and water exchange functions of the hot water tank 42; a hot water outlet valve 66 connected to the hot water tank 42 handles the hot water intake; and a room temperature outlet valve 67 connected between the pump 52 and the hot water tank valve 63 handles the room temperature pure water intake. One-way valve 68 is connected between the output end of the impurity removal component 1 and the output end of the return solenoid valve 23. One-way valve 68 is used to prevent the wastewater or pure water that has been returned from flowing back into the impurity removal component 1.

[0060] In this embodiment, refer to Figure 1 , Figure 2 , Figure 8 , Figure 10 and Figure 11 The pressureless reverse osmosis step-by-step water heater also includes a control component 7. The control component 7 can preset the heating temperature of the water tank 42 and can control the opening and closing of the hot water outlet valve 66 and the ambient temperature outlet valve 67 respectively. The operator can control the opening and closing of the hot water outlet valve 66 and the ambient temperature outlet valve 67 through the control component 7. The water tank 42 also includes a heating element 421, a water level probe 422, and a temperature probe 423. The control component 7 is electrically connected to the water level probe 422, the heating element 421, and the temperature probe 423 respectively. The water level probe 422 provides real-time feedback of the water level in the water tank 42 to the control component 7, preventing the temperature probe 423 from continuing to heat when the water level in the water tank 42 is low, which could damage the pressureless reverse osmosis step-by-step water heater. The boiling water tank temperature probe 423 feeds back the temperature of the boiling water tank 42 to the control component 7 in real time. Based on the temperature value fed back by the boiling water tank temperature probe 423, the boiling water tank 42 turns the heating tube 421 on or off in real time. The heating tube 421 heats the temperature of the boiling water tank 42 to the preset temperature.

[0061] The control component 7 is electrically connected to the booster pump 51 and the water pump 52 respectively. When the water level probe 422 of the hot water tank detects that the water level in the hot water tank 42 is low, the control component 7 will control the water pump 52 to pump the water in the pure water tank 41 to the hot water tank 42 until the water level probe 422 detects that the water level in the hot water tank 42 has reached the preset water level, and then the control component 7 will turn off the water pump 52.

[0062] The control component 7 can control the opening and closing of the pure water tank valve 62. The pure water tank 41 also includes a pure water tank level probe 411. When the pure water tank level probe 411 detects that the water level in the pure water tank 41 is low, the control component 7 will open the pure water tank valve 62, causing the water level in the pure water tank 41 to rise, until the pure water tank level probe 411 detects that the water level in the pure water tank 41 has reached the preset water level, at which point the control component 7 will close the pure water tank valve 62.

[0063] The implementation principle of this application embodiment is as follows: Tap water enters the pressureless reverse osmosis step-by-step water heater through the inlet. Large physical impurities are removed by the interception and removal component 11. Water temperature and quality are then detected by the NTC detector 15 and the third TDS detector 16, respectively. The water then undergoes two-stage adsorption pretreatment by the first adsorption and removal component 12 and the second adsorption and removal component 13. The water is then pressurized by the booster pump 51 and sent to the reverse osmosis processor 21 for deep filtration. The pure water output from the reverse osmosis processor 21, after passing the first TDS detector 22 test, undergoes post-adsorption treatment by the third adsorption and removal component 14, and then enters the pure water tank 41 for storage via the pure water tank valve 62. The wastewater output from the reverse osmosis processor 21 is detected by the second TDS detector 33 and then divided for further treatment by comparing its TDS value with a preset wastewater value. High-concentration wastewater is discharged directly, while low-concentration wastewater is returned to the inlet side of the reverse osmosis processor 21 for secondary filtration. When the TDS value of the pure water output by the reverse osmosis processor 21 does not meet the standard, the reflux solenoid valve 23 opens, allowing the pure water to flow back to the inlet side of the reverse osmosis processor 21 for further filtration. The pure water in the pure water tank 41, after being drawn by the water pump 52, can be supplied as room temperature water via the room temperature outlet valve 67, or it can be heated in the hot water tank 42 via the hot water tank valve 63 and then supplied as hot water via the hot water outlet valve 66. Compared to existing technologies, this application has the advantages of improving water resource recycling rates and reducing wastewater discharge.

[0064] Example 2: In one embodiment, the control method of the pressureless reverse osmosis step-by-step water boiler includes the following steps: Step S1: Activate the second TDS detector 33 to detect the TDS value of the wastewater; when the second TDS detector 33 detects that the TDS value of the wastewater is greater than the preset TDS value of the wastewater, open the first wastewater solenoid valve 31 and close the second wastewater solenoid valve 32, so that the wastewater is discharged through the first wastewater solenoid valve 31; Step S2: When the TDS value of the wastewater detected by the second TDS detector 33 is less than the preset TDS value of the wastewater, the first wastewater solenoid valve 31 is closed and the second wastewater solenoid valve 32 is opened, so that the wastewater and tap water are mixed and flow through the reverse osmosis processor 21 again before flowing to the first TDS detector 22.

[0065] In this embodiment, refer to Figure 4 , Figure 8 and Figure 9The second TDS detector 33, the first wastewater solenoid valve 31, and the second wastewater solenoid valve 32 are all communicatively connected to the control system of the pressureless reverse osmosis step-by-step water heater. The control system receives the detection data from the second TDS detector 33 and controls the opening and closing of the first wastewater solenoid valve 31 and the second wastewater solenoid valve 32 based on the detection data. The preset TDS value of the wastewater is pre-stored in the storage unit of the control system and can be set according to the recovery rate of the reverse osmosis processor 21 and the water quality of the tap water. In this control method, the second TDS detector 33 is first turned on in step S1 to obtain the actual TDS value of the wastewater discharged from the reverse osmosis processor 21, and this actual TDS value is used as the basis for determining the wastewater branch treatment. When the determination result shows that the TDS value of the wastewater is higher than the preset value of the wastewater, it indicates that the salt and impurity concentration in the wastewater is too high. The first wastewater solenoid valve 31 is then opened and the second wastewater solenoid valve 32 is closed, and this part of the wastewater is directly discharged through the first wastewater solenoid valve 31. In step S2, when the determination result shows that the TDS value of the wastewater is lower than the preset value, it indicates that this part of the wastewater needs to be re-filtered. The first wastewater solenoid valve 31 is closed and the second wastewater solenoid valve 32 is opened, allowing the wastewater to flow back through the second wastewater solenoid valve 32 and mix with tap water before re-entering the reverse osmosis processor 21. The purified water obtained from the secondary filtration is then sent to the first TDS detector 22 for the next stage of determination. The determination logic based on the TDS threshold enables automatic switching between wastewater discharge and wastewater recycling, solving the problem of water resource waste caused by the direct discharge of wastewater in existing control methods.

[0066] In one embodiment, step S2 specifically includes the following steps: Step S21: When the TDS value of the wastewater detected by the second TDS detector 33 is less than the preset TDS value of the wastewater, the first wastewater solenoid valve 31 is closed and the second wastewater solenoid valve 32 is opened. Step S22: After the wastewater and tap water are mixed, they flow through the reverse osmosis processor 21 and then to the first TDS detector 22. When the first TDS detector 22 detects that the pure water TDS value of the mixed water is less than the preset TDS value of the pure water, the reflux solenoid valve 23 is closed and the pure water flows to the third adsorption and impurity removal unit 14. Step S23: When the TDS value of the pure water in the mixed water is greater than the preset TDS value of the pure water detected by the first TDS detector 22, the reflux solenoid valve 23 is opened, and the mixed water flows back to the reverse osmosis processor 21 after mixing with the tap water.

[0067] In this embodiment, refer to Figure 3 , Figure 4 , Figure 8 and Figure 9The preset threshold for pure water can be selected within the range of 10 mg / L to 50 mg / L. The first TDS detector 22 and the reflux solenoid valve 23 are both connected to the control system of the tankless reverse osmosis step-by-step water boiler. The preset TDS value of the pure water is stored in the storage unit of the control system and can be set according to national drinking water standards. In S21, based on the premise that the wastewater TDS value is lower than the preset TDS value, the first wastewater solenoid valve 31 is closed and the second wastewater solenoid valve 32 is opened to establish a wastewater reflux channel. In S22, the wastewater mixes with tap water through the reflux channel and flows through the reverse osmosis processor 21 for secondary filtration. The first TDS detector 22 determines the pure water TDS value of the mixed water obtained from the secondary filtration. If the TDS value is lower than the preset TDS value of the pure water, the reflux solenoid valve 23 is closed, allowing the pure water to flow directly to the third adsorption and impurity removal unit 14 for further post-adsorption treatment. If, in step S23, the first TDS detector 22 detects that the pure water TDS value of the mixed water is greater than the preset TDS value of pure water, then the reflux solenoid valve 23 is opened, allowing the portion of mixed water that has not yet met the standard to flow back to the inlet side of the reverse osmosis processor 21 and mix with tap water for further filtration. Wastewater recovery is achieved by switching the solenoid valve on the wastewater side, and the pure water side is calibrated in real time during the recovery process by the reflux solenoid valve 23, so that wastewater circulation and pure water reflux work together to promote wastewater recovery while ensuring water quality.

[0068] In one embodiment, step S23 includes: S231: Compare the TDS value of the pure water in the mixed water measured by the first TDS detector 22 with the preset TDS value of the pure water; S232: When the first TDS detector 22 detects that the TDS value of the pure water in the mixed water is greater than the preset TDS value of the pure water, the second wastewater solenoid valve 32 is closed and the first wastewater solenoid valve 31 is opened to discharge the mixed wastewater. S233: Continue to operate when the TDS value of the pure water in the mixed water detected by the first TDS detector 22 is less than the preset TDS value of the pure water.

[0069] In this embodiment, refer to Figure 8 and Figure 9During step S23, the control system continuously monitors the detection data of the first TDS detector 22 and determines the destination of the mixed water based on the secondary detection results after the mixed water is returned. In S232, if the first TDS detector 22 detects that the TDS value of the purified water obtained after re-filtration is still higher than the preset TDS value of purified water within 1 minute, it indicates that this part of the mixed water still cannot meet the standard after multiple cycles of filtration, and there is no actual filtration gain after continued circulation. Then, the second wastewater solenoid valve 32 is closed and the first wastewater solenoid valve 31 is opened to discharge the corresponding mixed water wastewater. By setting an upper limit judgment condition for the return filtration result, the mixed water that cannot meet the standard is prevented from repeatedly circulating in the system for a long time, which would increase the burden on the reverse osmosis membrane. In S233, if the first TDS detector 22 detects that the TDS value of the purified water obtained after re-filtration has dropped below the preset TDS value of purified water, then the purified water flows to the third adsorption and impurity removal unit 14 to enter the post-adsorption stage.

[0070] The implementation principle of this application embodiment is as follows: The control method of the pressureless reverse osmosis step-by-step water boiler uses the wastewater TDS value collected by the second TDS detector 33 as the primary basis for wastewater diversion, and the pure water TDS value collected by the first TDS detector 22 as the secondary basis for reflux correction. The control system first determines the recycling value of the wastewater based on the wastewater TDS value. High-concentration wastewater is directly discharged through the first wastewater solenoid valve 31, and low-concentration wastewater is returned to the inlet side of the reverse osmosis processor 21 through the second wastewater solenoid valve 32 to mix with tap water for secondary filtration. Subsequently, the control system performs secondary judgment based on the TDS value of the pure water obtained from the secondary filtration. The pure water that meets the standard flows to the third adsorption and impurity removal element 14 for further post-adsorption, while the pure water that does not meet the standard is returned for filtration again through the reflux solenoid valve 23. The mixed water that still does not meet the standard after multiple cycles is discharged by closing the second wastewater solenoid valve 32 and opening the first wastewater solenoid valve 31. The two-stage judgment system, combined with two reflux channels, enables the wastewater recycling process to continuously recover low-salinity wastewater to improve water resource utilization, while also allowing for timely termination of circulation to protect the reverse osmosis membrane when water quality fails to meet standards. Compared to existing technologies, this application offers the advantages of improved water resource recycling rates and reduced wastewater discharge.

[0071] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pressureless reverse osmosis step-by-step water boiler, characterized in that, include: Impurity removal component (1) is used to filter impurities in tap water; The reverse osmosis component (2) includes a reverse osmosis processor (21) and a first TDS detector (22). The reverse osmosis processor (21) is connected to the impurity removal component (1). The first TDS detector (22) is located downstream of the reverse osmosis processor (21) and is connected to the reverse osmosis processor (21) for detecting the TDS value of pure water. The wastewater circulation assembly (3) includes a first wastewater solenoid valve (31), a second wastewater solenoid valve (32), and a second TDS detector (33). The second TDS detector (33) is located downstream of the reverse osmosis processor (21) and is connected to the reverse osmosis processor (21) for detecting the TDS value of the wastewater. The first wastewater solenoid valve (31) is located downstream of the second TDS detector (33) and is connected to the second TDS detector (33). The input end of the second wastewater solenoid valve (32) is connected between the second TDS detector (33) and the first wastewater solenoid valve (31). The output end of the second wastewater solenoid valve (32) is connected between the impurity removal component (1) and the reverse osmosis processor (21). When the second TDS detector (33) detects that the TDS value of the wastewater is greater than the preset TDS value of the wastewater, the first wastewater solenoid valve (31) opens and the second wastewater solenoid valve (32) closes, discharging wastewater. When the second TDS detector (33) detects that the TDS value of the wastewater is less than the preset TDS value of the wastewater, the first wastewater solenoid valve (31) closes and the second wastewater solenoid valve (32) opens, and the wastewater flows through the reverse osmosis processor (21) repeatedly.

2. The pressureless reverse osmosis step-by-step water boiler according to claim 1, characterized in that, The reverse osmosis assembly (2) also includes a reflux solenoid valve (23), the input end of which is connected to the downstream of the first TDS detector (22), and the output end of which is connected between the impurity removal assembly (1) and the reverse osmosis processor (21).

3. The pressureless reverse osmosis step-by-step water boiler according to claim 2, characterized in that, The impurity removal component (1) includes an interception impurity removal element (11), a first adsorption impurity removal element (12), and a second adsorption impurity removal element (13). The input end of the interception impurity removal element (11) is connected to the water inlet, and the output end of the interception impurity removal element (11) is connected to the upstream of the reverse osmosis processor (21). The input end of the first adsorption impurity removal element (12) is connected to the output end of the interception impurity removal element (11), and the output end of the first adsorption impurity removal element (12) is connected to the input end of the reverse osmosis processor (21). The input end of the second adsorption impurity removal element (13) is connected to the output end of the first adsorption impurity removal element (12), and the output end of the second adsorption impurity removal element (13) is connected to the input end of the reverse osmosis processor (21).

4. The pressureless reverse osmosis step-by-step water boiler according to claim 3, characterized in that, The impurity removal component (1) further includes a third adsorption impurity removal element (14), which is distributed downstream of the first TDS detector (22) and communicates with the first TDS detector (22).

5. The pressureless reverse osmosis step-by-step water boiler according to claim 3, characterized in that, The impurity removal component (1) further includes an NTC detector (15) and a third TDS detector (16). The input end of the NTC detector (15) is connected to the interception and impurity removal component (11), and the output end of the NTC detector (15) is connected to the first adsorption and impurity removal component (12). The input end of the third TDS detector (16) is connected to the output end of the NTC detector (15), and the output end of the third TDS detector (16) is connected to the input end of the reverse osmosis processor (21).

6. The pressureless reverse osmosis step-by-step water boiler according to claim 4, characterized in that, The pressureless reverse osmosis step water heater also includes a containment component (4), which includes a pure water tank (41) and a hot water tank (42). The pure water tank (41) is located downstream of the third adsorption and impurity removal component (14) and is connected to the third adsorption and impurity removal component (14). The hot water tank (42) is located downstream of the pure water tank (41) and is connected to the pure water tank (41).

7. The pressureless reverse osmosis step-by-step water boiler according to claim 6, characterized in that, The pressureless reverse osmosis step-by-step water heater also includes a water pump assembly (5), which includes a booster pump (51) and a pump (52). The input end of the booster pump (51) is connected to the output end of the second adsorption and impurity removal component (13), and the output end of the booster pump (51) is connected to the input end of the reverse osmosis processor (21). The input end of the pump (52) is connected to the pure water tank (41), and the output end of the pump (52) is connected to the hot water tank (42). The pressureless reverse osmosis step-by-step water heater also includes a valve assembly (6), which includes an inlet solenoid valve (61), a pure water tank valve (62), a hot water tank valve (63), an empty solenoid valve (64), a water exchange solenoid valve (65), a hot water outlet valve (66), a normal temperature outlet valve (67), and a check valve (68). The input end of the inlet solenoid valve (61) is connected to the output end of the interception and impurity removal component (11), and the output end of the inlet solenoid valve (61) is connected to the input end of the first adsorption and impurity removal component (12). The input end of the pure water tank valve (62) is connected to the... The output end of the third adsorption and impurity removal component (14) is connected, and the output end of the pure water tank valve (62) is connected to the pure water tank (41); the input end of the hot water tank valve (63) is connected to the output end of the water pump (52); the drain solenoid valve (64), the hot water outlet valve (66), and the water exchange solenoid valve (65) are all connected to the hot water tank (42); the ambient temperature outlet valve (67) is connected between the water pump (52) and the hot water tank valve (63); the one-way valve (68) is connected between the output end of the impurity removal component (1) and the output end of the return solenoid valve (23).

8. A control method for a tankless reverse osmosis step-by-step water boiler as described in claim 4, characterized in that, Includes the following steps: Step S1: Turn on the second TDS detector (33) to detect the TDS value of the wastewater; When the TDS value of the wastewater detected by the second TDS detector (33) is greater than the preset TDS value of the wastewater, the first wastewater solenoid valve (31) is opened and the second wastewater solenoid valve (32) is closed, so that the wastewater is discharged through the first wastewater solenoid valve (31). Step S2: When the TDS value of the wastewater detected by the second TDS detector (33) is less than the preset TDS value of the wastewater, the first wastewater solenoid valve (31) is closed and the second wastewater solenoid valve (32) is opened, so that the wastewater and tap water are mixed and flow through the reverse osmosis processor (21) and then flow to the first TDS detector (22).

9. The control method for the pressureless reverse osmosis step-by-step water boiler according to claim 8, characterized in that, Step S2 specifically includes the following steps: Step S21: When the TDS value of the wastewater detected by the second TDS detector (33) is less than the preset TDS value of the wastewater, close the first wastewater solenoid valve (31) and open the second wastewater solenoid valve (32). Step S22: After the wastewater and tap water are mixed, the wastewater flows through the reverse osmosis processor (21) and then flows to the first TDS detector (22); when the first TDS detector (22) detects that the pure water TDS value of the mixed water is less than the preset TDS value of the pure water, the reflux solenoid valve (23) is closed and the pure water flows to the third adsorption and impurity removal unit (14). Step S23: When the first TDS detector (22) detects that the TDS value of the pure water in the mixed water is greater than the preset TDS value of the pure water, the reflux solenoid valve (23) is opened, and the mixed water flows back to the reverse osmosis processor (21) after mixing with tap water.

10. The control method for the tankless reverse osmosis step-by-step water boiler according to claim 9, characterized in that, Step S23 includes: S231: Compare the TDS value of pure water in the mixed water measured by the first TDS detector (22) with the preset TDS value of pure water; S232: When the first TDS detector (22) detects that the TDS value of the pure water in the mixed water is greater than the preset TDS value of the pure water, the second wastewater solenoid valve (32) is closed and the first wastewater solenoid valve (31) is opened to discharge the mixed wastewater. S233: The system continues to operate when the TDS value of the pure water in the mixed water detected by the first TDS detector (22) is less than the preset TDS value of the pure water.

Images