Three-electric switching energy-saving drinking water preparation system

Abstract

The utility model belongs to water treatment technical field, the utility model discloses a kind of three electric switching energy-saving drinking water preparation systems, the system includes: water preparation module is prepared as drinking water to tap water, power module includes solar photovoltaic power supply unit, grid power supply unit, diesel power supply unit and switch, the switch is used to switch solar photovoltaic power supply unit or grid power supply unit or diesel power supply unit for water preparation module power supply, electric control module includes electric energy sensor, the data acquisition circuit of electric connection with the output end of electric energy sensor, and the microcontroller of data bus connection with data acquisition circuit;The microcontroller is electrically connected with the control signal input end of switch by output pin, system dynamic control power module is switched between different power supply unit, when solar energy is insufficient, automatically switched to grid power supply or enable diesel power generation as backup, both renewable energy is maximized, and power supply continuity is also ensured.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a three-electric switching energy-saving drinking water preparation system. Background Technology

[0002] Piped drinking water systems have seen significant development in recent years. These systems use tap water as the raw water source, which is then deeply purified through membrane technologies such as reverse osmosis and nanofiltration before being supplied to people for direct drinking. A piped drinking water system includes a water purification unit, delivery pipelines, and user terminals.

[0003] There are currently two types of direct drinking water delivery pipelines on the market. One is a main pipeline circulation system with branch pipes at the water points providing unidirectional delivery; this is the most popular option. The other is a unidirectional delivery system, where water is delivered from the roof down to each water point, where water dispensers are installed; this is the option chosen by a smaller number of schools and similar institutions.

[0004] Energy conservation and environmental protection are important goals in the development of water treatment technology. As shown in the technical content of the patent No. 2021228621380, an energy-saving water treatment system, current conventional energy-saving water treatment still focuses on the water treatment device or system for technological improvement, neglecting the energy source of the water treatment device.

[0005] The existing power supply mode of water treatment equipment lacks a coordinated control mechanism and cannot flexibly adapt to different power supply units according to the energy supply status. It either relies solely on the traditional power grid and cannot connect to clean energy power supply, resulting in high operating energy consumption and carbon emissions; or although it is equipped with clean energy power generation devices, it cannot automatically switch the power source according to the energy sufficiency. This makes it difficult to maximize the use of clean energy to achieve energy-saving goals and also makes it difficult to ensure continuous power supply for the water treatment process under extreme energy supply conditions, thus restricting the energy-saving and environmental protection and operational stability of the system.

[0006] Therefore, how to provide a drinking water preparation device that can reduce operating energy consumption and is energy-saving and environmentally friendly has become an urgent technical problem to be solved. Utility Model Content

[0007] This application aims to address the shortcomings of existing technologies by proposing a three-electric switching energy-saving drinking water preparation system. This system can not only monitor the power generation and energy storage of the solar photovoltaic power unit in real time, but also automatically switch between different power units according to the energy storage. At the same time, it can recycle and utilize the wastewater generated during the water production process through a water recycling system, which is energy-saving and environmentally friendly.

[0008] To achieve the purpose of this application, this application provides a three-electricity switching energy-saving drinking water preparation system, the system comprising: The water purification module processes tap water into drinking water; The power module includes a solar photovoltaic power unit, a grid power unit, a diesel generator power unit, and a switching switch. The switching switch is used to switch the solar photovoltaic power unit, the grid power unit, or the diesel generator power unit to supply power to the water production module. The three-electric control module includes an electrical energy sensor, a data acquisition circuit electrically connected to the output terminal of the electrical energy sensor, and a microcontroller connected to the data acquisition circuit via a data bus; the microcontroller is electrically connected to the control signal input terminal of the switching switch via an output pin.

[0009] Furthermore, the three-electric control module is equipped with a power sensor, a data acquisition circuit connected to the output terminal of the power sensor, and a microcontroller connected to the data acquisition circuit via a data bus; the microcontroller sends control signals to the power module through its output pins.

[0010] The three-electric control module, through the coordinated operation of power sensors, data acquisition circuits, microcontrollers, and control circuits, accurately acquires power data from the power modules, such as the power generation of the solar photovoltaic power unit, the stability of the grid power supply, and the energy consumption status of the diesel generator. Based on this power data, the three-electric control module switches between power units, achieving precise regulation of energy utilization and reducing energy consumption and costs in the water production process. Furthermore, the solar photovoltaic power unit includes an inverter, a solar photovoltaic power generation device, a photovoltaic controller, and a battery. The photovoltaic controller is electrically connected to the inverter, the battery, and the solar power generation device. The battery is used to store the direct current generated by the solar photovoltaic power generation device, and the inverter is used to convert the direct current stored in the battery into alternating current and send it to the water production module.

[0011] The solar photovoltaic power unit connects to the inverter, battery, and solar photovoltaic power generation device via a photovoltaic controller, forming a closed loop of "power generation-energy storage-inversion". The photovoltaic controller converts the direct current solar power stored in the battery into alternating current (AC) power via the inverter and delivers it to the water treatment module as needed. This design maximizes the use of green energy sources such as solar energy, reduces dependence on the power grid or diesel power generation, and lowers the carbon emissions and operating costs of the water treatment system from the energy source.

[0012] Furthermore, the water production module includes: Pretreatment system: Tap water enters the pretreatment system through the inlet for pretreatment; The reverse osmosis water purification unit has its inlet connected to the outlet of the pretreatment system via a pipe. The pretreated water enters the reverse osmosis water purification unit for deep desalination to produce pure water. A drinking water storage tank is used to store pure water. The inlet of the drinking water storage tank is connected to the outlet of the reverse osmosis water purification unit through a pipe. An ozone disinfection device is connected to one end of a drinking water storage tank via a pipe. After ozone enters the drinking water storage tank and mixes with pure water, it forms ozone-mixed water. The first variable frequency delivery pump has its inlet connected to the outlet of the drinking water storage tank via a pipeline. The ozone-mixed water is delivered to the water supply network for disinfection via the first variable frequency delivery pump. The first variable frequency delivery pump is connected to the ultraviolet sterilizer and the microporous filter in sequence through the pipeline along the ozone mixed water delivery direction. The ozone mixed water is disinfected by ultraviolet sterilizer and filtered by microporous filter before being delivered to the water terminal. The first three-way valve is located between the microporous filter and the water terminal and is used to switch the water supply direction. The control cabinet is electrically connected to the pretreatment system, the reverse osmosis water purification unit, the drinking water storage tank, the ozone disinfection device, the first variable frequency delivery pump, and the first three-way valve.

[0013] Furthermore, the water production module also includes a recycled water collection system, which is connected to the pretreatment system, the reverse osmosis water production unit, the water terminal, and the microporous filter via pipelines. A second delivery pump and a disinfection system are provided between the recycled water collection system and the pretreatment system. The recycled water collection system collects return water, which includes reverse osmosis concentrate, substandard return water, and ozone disinfection water.

[0014] The recycled water collection system integrates reverse osmosis concentrate, substandard recycled water, and ozone disinfection water, and transports it to the pretreatment system via a second transfer pump and disinfection system, achieving the recycling of recycled water. This design significantly reduces water waste and lowers the water cost of the water production process. At the same time, through the "recycled water disinfection + pretreatment" process, it ensures the safety of the recycled water for reuse, improving the system's sustainability from a resource perspective.

[0015] Furthermore, the water production module includes a water production flow rate monitor, which is used to monitor the water flow rate of the filtered ozone-mixed water. The water production flow rate monitor is located between the microporous filter and the recycled water collection system, and is electrically connected to the control cabinet.

[0016] Furthermore, the water production module includes a conductivity meter, which is used to monitor the conductivity of the filtered ozone-mixed water. The conductivity meter is located between the microporous filter and the recycled water collection system, and is connected to the control cabinet.

[0017] A product water flow rate monitor and a conductivity meter are installed between the microporous filter and the recycled water collection system to monitor the flow rate and conductivity of the ozone-mixed water in real time. After the monitoring data is transmitted to the control cabinet, the control cabinet intelligently switches the water supply direction based on the data. This design provides precise data support for system operation, realizes intelligent control of the water supply direction, and ensures stable water quality and efficient system operation.

[0018] The beneficial effects of this application are: First, the system acquires real-time power data from the power modules through the three-electric control module, and dynamically controls the power modules to intelligently switch between different power sources (solar photovoltaic, grid, and diesel generator). This feature allows the system to prioritize solar power, automatically switch to grid power when solar energy is insufficient, and activate diesel generator as a backup in extreme cases, maximizing the use of renewable energy while ensuring power continuity.

[0019] Secondly, the multi-power unit design and switching function of the power module significantly improve the system's energy efficiency and adaptability. For example, under sufficient sunshine, the system can rely entirely on solar photovoltaic power, reducing dependence on the traditional power grid and decreasing carbon emissions and operating costs. At night or during cloudy or rainy weather, the system can seamlessly switch to grid power to ensure uninterrupted water production. In the event of grid failure or in remote areas, the diesel generator unit provides a reliable emergency power source. This multi-power coordinated power supply mode enables the system to operate stably under various environmental conditions, making it particularly suitable for areas with unstable energy supplies.

[0020] Finally, the water production module directly utilizes the optimized electrical energy provided by the power module to efficiently treat tap water into drinking water. The entire system, through intelligent energy management, ensures low energy consumption and high-quality output during the water production process. Overall, this system, through intelligent control and multi-power source integration, achieves on-demand energy allocation and prioritizes the use of clean energy. This not only reduces operating costs and environmental impact but also improves the reliability and sustainability of drinking water production, demonstrating significant energy-saving, environmentally friendly, and practical value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the modular structure of a three-electric switching energy-saving drinking water preparation system according to the present invention; Figure 2 This is a schematic diagram of the system structure of a three-electric switching energy-saving drinking water preparation system according to a specific embodiment of the present invention.

[0022] In the diagram: 1. Grid power supply unit, 2. Inverter, 3. Solar photovoltaic power supply unit, 4. Photovoltaic controller, 5. Storage battery, 6. Three-electric control module, 7. Diesel generator power supply unit, 8. Control cabinet, 9. Pretreatment system, 10. Reverse osmosis water purification unit, 11. Drinking water storage tank, 12. Ozone disinfection device, 13. First variable frequency transfer pump, 14. Ultraviolet sterilizer, 15. Microporous filter, 16. Second variable frequency transfer pump, 17. Disinfection system, 18. Product water flow rate monitor, 19. Conductivity meter, 20. First three-way valve, 21. Second three-way valve, 22. Third three-way valve, 23. Recycled water collection system. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] Reference Figure 1 This utility model provides a three-electric switching energy-saving drinking water preparation system, the system comprising: The three-electric control module 6 is used to acquire the power data of the power module and control the power module to switch power units according to the power data; the three-electric control module 6 is electrically connected to the power module; the three-electric control module 6 is equipped with a power sensor, a data acquisition circuit connected to the output terminal of the power sensor, and a microcontroller connected to the data acquisition circuit through a data bus; the microcontroller is electrically connected to the control signal input terminal of the switching switch through an output pin.

[0026] In some specific embodiments, the power sensor can be one of a voltage transformer, a current transformer, or a power sensor, which collects power data such as voltage, current, and power from the power module in real time, converting the physical quantities into electrical signals. A data acquisition circuit, such as an analog-to-digital converter (ADC), converts the analog signal output by the power sensor into a digital signal for subsequent digital processing. The microcontroller, which can be a single-chip microcomputer or an ARM chip, performs calculations and analysis on the digital power data (such as determining whether the power meets switching conditions) and generates control commands.

[0027] In some specific embodiments, the microcontroller is electrically connected to the control signal input terminal of the switch via an output pin. The switch is not limited to multiple single-pole relays, a single multi-pole relay, a PLC, or an automatic transfer switch (ATS). For example, when the switch is a single multi-pole relay, a 12VDC 3-group contact relay can be selected. The three output terminals of this relay are electrically connected one-to-one with the solar photovoltaic power unit, the grid power unit, and the diesel generator power unit; that is, each output terminal is connected to only one power unit not electrically connected to a relay, and each group of relays independently controls one power unit.

[0028] For example, when the switch is multiple single-pole relays, the microcontroller is electrically connected to the control signal input terminal of each single-pole relay through its output pin, and the output terminal of each single-pole relay is connected to the corresponding power module.

[0029] The analog signals (voltage, current, etc.) output by the power sensor are input to the data acquisition circuit, completing the initial conversion from physical quantities to electrical signals. The data acquisition circuit converts the analog signals into digital signals and transmits them to the microcontroller's input pins via a data bus (such as SPI or I2C), allowing the microcontroller to read the power data. Based on the analysis results of the power data (such as determining insufficient power supply from the current power unit), the microcontroller sends control signals (such as high / low levels) to the drive circuit via output pins (such as GPIO). The drive circuit amplifies the microcontroller's weak current control signals into strong current drive signals, controlling the switching of power units in the power module (such as relay activation / deactivation to switch different power units on and off).

[0030] The three-electric control module 6 realizes intelligent power switching and control, giving priority to the use of solar photovoltaic unit power. When the power of the solar photovoltaic unit is insufficient, it automatically switches to the grid power unit 1. When the grid power unit 1 is insufficient, the diesel generator power unit 7 is started to ensure the continuous and stable operation of the equipment.

[0031] Reference Figure 2 The power module is used to switch power units according to the control signals of the three-electric control module 6 and to supply power to the water production module. The power unit includes a solar photovoltaic power unit 3, a grid power unit 1, and a diesel generator power unit 7; the power module is connected to the water production module; the solar photovoltaic power unit 3 includes an inverter 2, a solar photovoltaic power generation device 24, a photovoltaic controller 4, and a battery 5. The photovoltaic controller 4 is electrically connected to the inverter 2, the battery 5, and the solar power generation device. The battery 5 is used to store the DC power generated by the solar photovoltaic power generation device 24. The photovoltaic controller 4 sends the power data of the battery 5 to the three-electric control module 6, and converts the DC power to AC power through the inverter 2 according to the control signals and delivers the AC power to the water production module.

[0032] Specifically, the solar photovoltaic power generation device 24 comes into contact with the sun, absorbs solar energy and converts it into electrical energy. The direct current (DC) generated by the solar photovoltaic power generation device 24 is fed into the battery 5 through the photovoltaic controller 4. When the battery 5 releases electrical energy, it enters the inverter 2 through the photovoltaic controller 4. The inverter 2 converts the DC power into alternating current (AC power), and then inputs the AC power into the water production module.

[0033] In some specific embodiments, solar photovoltaic power is used as the first priority power source. When the battery 5's charge reaches 80% or more, the three-electric control module 6 controls the solar photovoltaic power unit 3 to supply power to the water purification equipment. When the battery 5's charge drops to below 20%, the solar photovoltaic power supply is stopped, and the power supply is switched to the grid power unit 1 in a timely manner. The 80% charge of the battery 5 is used as the start-up threshold for starting the solar photovoltaic power unit 3 in this embodiment, and the 20% charge drop is used as the stop-down threshold for stopping the solar photovoltaic power unit 3 in this embodiment. These start-up or stop-down thresholds can be preset according to actual conditions.

[0034] In some specific implementations, the three-electric control module 6 can monitor the battery 5 in real time, display the voltage and power of the battery 5, and transmit the power consumption to the control cabinet 8 in the water production module for recording. The control cabinet 8 transmits the information to the remote communication system to realize remote data communication. Users can intuitively understand the power consumption on the terminal and manually control the power switching.

[0035] In some specific implementations, the mains power supply unit 1 provides 220V or 380V power. The mains power supply unit 1 is used as a second-order power source, and intelligent switching is performed by the three-electric control module 6 to save energy. The mains power supply unit 1 is equipped with an electricity meter for electricity measurement and inputs the electricity information into the control cabinet 8 for data statistics.

[0036] The diesel generator power supply unit 7 serves as an emergency backup power source, i.e., as the third priority power source. It automatically starts in special circumstances where the solar photovoltaic power supply unit 3 and the grid power supply unit 1 cannot provide power. The diesel generator power supply unit 7 is equipped with a meter for measuring electricity consumption and inputting the electricity consumption information into the control cabinet 8 for data statistics.

[0037] The water purification module uses electricity provided by the power module to treat tap water into drinking water. The water production module includes a pretreatment system 9. Tap water enters the pretreatment system 9 through its inlet for pretreatment. The outlet of the pretreatment system 9 is connected to the inlet of the reverse osmosis water purification unit 10. The pretreated water then enters the reverse osmosis water purification unit 10 for deep desalination to produce pure water. The outlet of the reverse osmosis water purification unit 10 is connected to the inlet of a drinking water storage tank 11. One end of the drinking water storage tank 11 is connected to an ozone disinfection device 12. After the pure water and ozone mix in the drinking water storage tank 11, they form ozone-mixed water, which is used for disinfection of the tank and pipelines. The outlet of the drinking water storage tank 11 is connected to the first variable frequency delivery pump 13. The ozone mixed water is delivered to the water supply network for disinfection through the variable frequency delivery pump. The first variable frequency delivery pump 13 is connected to the ultraviolet sterilizer 14 and the microporous filter 15 in sequence through water pipes. The ozone mixed water is disinfected by ultraviolet sterilizer 14 and filtered by microporous filter 15 before being delivered to the water terminal. Microporous filter 15 can intercept particles larger than 0.22 microns to ensure water safety.

[0038] Multiple first three-way valves 20 are used to control the opening or closing of the valves according to the control instructions of the control cabinet 8, thereby switching the water supply direction.

[0039] The control cabinet 8 is connected to the pretreatment system 9, the reverse osmosis water purification unit 10, the drinking water storage tank 11, the ozone disinfection device 12, the variable frequency transfer pump, the ultraviolet sterilizer 14, and multiple first three-way valves 20, respectively, and is used to control the various devices in the water purification module.

[0040] The pretreatment system 9, which reduces turbidity, removes residual chlorine, and lowers hardness, serves as the pretreatment unit for the reverse osmosis water purification unit 10, ensuring its safe and stable operation. Tap water is used as the raw water for filtration, and recycled water is used for backwashing. (The pretreatment system intercepts colloids, suspended solids, large particles, or debris from pipes in the tap water. It operates with a top-in, bottom-out configuration.) After running for a period of time, typically 3-5 days, the intercepted contaminants accumulate on the surface of the pretreatment equipment, leading to increased operating pressure and reduced water production. To restore the pretreatment's water production capacity, the pretreatment system 9 needs to be backwashed from bottom to top to remove the deposits. While conventional backwashing uses tap water, this project utilizes recycled wastewater for backwashing to conserve water resources and improve water utilization efficiency.

[0041] The reverse osmosis water purification unit 10 is used to prepare pure water to meet the requirements for drinking pure water. The reverse osmosis concentrate and rinsing water generated during its operation are collected and stored in the recycled water collection system 23.

[0042] The drinking water storage tank 11 is used to store the pure water produced by the reverse osmosis water purification unit 10.

[0043] The ozone disinfection device 12 generates ozone. The ozone enters the drinking water storage tank 11 and mixes with pure water to form ozone-mixed water, which is used for disinfection of the tank and pipelines. Ozone has a half-life of 30 minutes and can decompose spontaneously. The ozone disinfection device 12 typically operates on a timed nighttime schedule, and the disinfection time can be managed and adjusted via the control cabinet 8.

[0044] When the ozone disinfection device 12 is running, ozone-mixed water enters the pipeline for circulation disinfection. At this time, the control cabinet 8 controls the pretreatment system 9 and the three-way valve to automatically switch to discharge mode, allowing the ozone-mixed water to pass through, achieving disinfection of all water points in the entire pipeline. The discharged water is ozone-mixed water, which can self-dissolve and will not pollute the environment. Therefore, it is collected uniformly and transported by pipeline to the recycling water collection system 23 for recycling and storage, realizing the reuse of water resources.

[0045] A first three-way valve 20 is installed between the drinking water storage tank 11, the water terminal and the microporous filter 15. After disinfection, the control cabinet 8 controls the pretreatment system 9 and the first three-way valve 20 to automatically switch to the drinking water replenishment state, so as to supply drinking water to the water terminal.

[0046] The variable frequency delivery pump transports the pure water stored in the drinking water storage tank 11 to the downstream ultraviolet sterilizer 14 for sterilization, and then into the microporous filter 15 to intercept particles larger than 0.22 microns, bacterial remains, etc. After filtration by the microporous filter 15, the water is delivered to each water terminal.

[0047] The water production module also includes a recycled water collection system 23, which is connected to the pretreatment system 9, the reverse osmosis water production unit 10, the water terminal, and the microfiltration filter 15 via water pipes. A second three-way valve 21 is installed between the recycled water collection system 23, the microfiltration filter 15, and the drinking water storage tank 11. The recycled water collection system 23 is also connected to the control cabinet 8. A second variable frequency delivery pump 16 and a disinfection system 17 are installed between the recycled water collection system 23 and the pretreatment system 9. A third three-way valve 22 is installed between the second variable frequency delivery pump 16, the pretreatment system 9, and the miscellaneous water outlet. When the pretreatment system needs backwashing, the control cabinet 8 controls this valve to allow water to flow out of the recycled water collection system 23. The disinfected return water is then pumped back to the pretreatment system 9 via the second variable frequency delivery pump 16. When the pretreatment system 9 no longer needs backwashing or the rinsing is finished, the valve is switched to the miscellaneous water supply direction to output return water for watering, watering flowers, irrigation, etc., avoiding water waste and saving energy. The recycled water collection system 23 collects and stores recycled water, which includes reverse osmosis concentrate, substandard recycled water, and ozone disinfection water.

[0048] In some embodiments, the water production module further includes a product water flow rate monitor 18 and a conductivity meter 19 for monitoring the water flow rate and conductivity of the filtered ozone mixed water. The product water flow rate monitor 18 and the conductivity meter 19 are disposed between the microporous filter 15 and the recycled water collection system 23, and both the product water flow rate monitor 18 and the conductivity meter 19 are connected to the control cabinet 8.

[0049] Because low water flow rates can easily breed bacteria, control cabinet 8 monitors the flow rate of the ozone-mixed water in real time through a product water flow rate monitor 18, and controls the flow rate of the ozone-mixed water within the range of 1m / s to 2m / s via a variable frequency delivery pump to ensure the safety of the prepared drinking water. This flow rate range can be adjusted and preset according to different usage conditions to meet more application scenarios.

[0050] Conductivity is one of the core indicators in water quality monitoring and water treatment. It quantifies the conductivity of dissolved substances in water, reflecting the degree of water pollution and the abundance of dissolved substances, and provides a basis for decision-making in water treatment processes. A second three-way valve 21 is installed between the recycled water collection system 23, the drinking water storage tank 11, and the microporous filter 15 to switch the water supply direction. The control cabinet 8 monitors the conductivity of the ozone mixed water in real time through a conductivity meter 19 and monitors the return water quality online. When the conductivity is ≥ the set value (usually 10 μs / cm), it indicates that the concentration of dissolved substances (or pollutants) in the water has reached the threshold, and the system will switch to the "recycled water collection" mode. The second three-way valve 21 switches the water supply direction to supply the recycled water collection system 23. When the conductivity is less than the set value, the second three-way valve 21 switches the water supply direction to supply the drinking water storage tank 11. It should be noted that the control methods, software, or algorithms involved in the above process are not within the protection scope of this utility model.

[0051] In the description of this specification, the references to terms such as "an embodiment," "some embodiments," "example," "specific example," "a implementation," "a preferred implementation," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A three-electric switching energy-saving drinking water preparation system, characterized in that, The system includes: The water purification module processes tap water into drinking water. The power module includes a solar photovoltaic power unit, a grid power unit, a diesel generator power unit, and a switching switch. The switching switch is used to switch the solar photovoltaic power unit, the grid power unit, or the diesel generator power unit to supply power to the water production module. The three-electric control module includes an electrical energy sensor, a data acquisition circuit electrically connected to the output terminal of the electrical energy sensor, and a microcontroller connected to the data acquisition circuit via a data bus; the microcontroller is electrically connected to the control signal input terminal of the switching switch via an output pin.

2. The energy-saving drinking water preparation system with three-electric switching as described in claim 1, characterized in that, The solar photovoltaic power unit includes an inverter, a solar photovoltaic power generation device, a photovoltaic controller, and a battery. The photovoltaic controller is electrically connected to the inverter, the battery, and the solar power generation device. The battery is used to store the direct current generated by the solar photovoltaic power generation device, and the inverter is used to convert the direct current stored in the battery into alternating current and send it to the water production module.

3. The energy-saving drinking water preparation system with three-electric switching according to claim 2, characterized in that, The water production module includes: Pretreatment system: Tap water enters the pretreatment system through the inlet for pretreatment; The reverse osmosis water purification unit has its inlet connected to the outlet of the pretreatment system via a pipe. The pretreated water enters the reverse osmosis water purification unit for deep desalination to produce pure water. A drinking water storage tank is used to store pure water. The inlet of the drinking water storage tank is connected to the outlet of the reverse osmosis water purification unit through a pipe. An ozone disinfection device is connected to one end of a drinking water storage tank via a pipe. After ozone enters the drinking water storage tank and mixes with pure water, it forms ozone-mixed water. The first variable frequency delivery pump has its inlet connected to the outlet of the drinking water storage tank via a pipeline. The ozone-mixed water is delivered to the water supply network for disinfection via the first variable frequency delivery pump. The first variable frequency delivery pump is connected to the ultraviolet sterilizer and the microporous filter in sequence through the pipeline along the ozone mixed water delivery direction. The ozone mixed water is disinfected by ultraviolet sterilizer and filtered by microporous filter before being delivered to the water terminal. The first three-way valve is located between the microporous filter and the water terminal and is used to switch the water supply direction. The control cabinet is electrically connected to the pretreatment system, the reverse osmosis water purification unit, the drinking water storage tank, the ozone disinfection device, the first variable frequency delivery pump, and the first three-way valve.

4. The energy-saving drinking water preparation system with three-electric switching according to claim 3, characterized in that, The water production module also includes a recycled water collection system, which is connected to the pretreatment system, the reverse osmosis water production unit, the water terminal, and the microfiltration filter via pipelines. A second transfer pump and a disinfection system are provided between the recycled water collection system and the pretreatment system. The recycled water collection system collects return water, which includes reverse osmosis concentrate, substandard return water, and ozone disinfection water.

5. The energy-saving drinking water preparation system with three-electric switching according to claim 4, characterized in that, The water production module includes a water production flow rate monitor, which is used to monitor the water flow rate of the ozone mixed water after filtration. The water production flow rate monitor is located between the microporous filter and the recycled water collection system, and is electrically connected to the control cabinet.

6. The energy-saving drinking water preparation system with three-electric switching according to claim 4, characterized in that, The water production module includes a conductivity meter, which is used to monitor the conductivity of the filtered ozone-mixed water. The conductivity meter is located between the microporous filter and the recycled water collection system, and is connected to the control cabinet.

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