A reverse osmosis water maker and filter linkage control system

Abstract

This application discloses a reverse osmosis water maker and filter linkage control system, relating to the field of reverse osmosis water production technology. It includes a seawater supply and backwashing unit, comprising a seawater supply pump, a control box, a backwashing pipeline, and a three-way valve. Each water maker is equipped with one seawater supply pump, which is connected to the main inlet pipeline via a flange. Its motor is electrically connected to the control box for independent start-stop control. The backwashing pipeline is connected to an independent backwashing water source via the three-way valve. This application, through integrated PLC control and multi-unit linkage design, achieves efficient and automated operation of the reverse osmosis water maker and filter system. The system has an independently controllable seawater supply and backwashing mechanism, which can accurately start the corresponding pump during multi-media filter backwashing, avoiding interference with the main process. The high-pressure pump monitoring unit monitors the inlet and outlet pressures in real time through dual pressure transmitters, combined with graded alarms and automatic shutdown functions, effectively preventing equipment damage risks.

Description

Technical Field

[0001] This application relates to the field of reverse osmosis water production technology, and in particular to a reverse osmosis water production machine and filter linkage control system. Background Technology

[0002] Traditional reverse osmosis water production systems typically operate from relatively independent units, lacking efficient collaborative control between them. The backwashing of seawater supply pumps and multi-media filters, the protection of high-pressure pumps, chemical dosing, and the switching of operating modes largely rely on manual intervention or simple local control, presenting significant limitations. For example, filter backwashing may affect the stable water supply of the main system, posing a risk of interruption; high-pressure pumps lack precise monitoring and linkage protection of inlet and outlet pressures, making them susceptible to damage due to dry running or overpressure; switching water production modes relies on manual operation of valves and pumps, resulting in slow response and a high risk of errors; the asynchronous cleaning and chemical dosing processes of filters lead to poor cleaning effects and low automation; furthermore, the decentralized control of each water maker makes centralized management and optimized operation difficult. These shortcomings result in low system operating efficiency, high energy consumption, heavy workload for operators, and the need to improve the overall reliability and intelligence level of the system. Summary of the Invention

[0003] To address the aforementioned issues, this application provides a reverse osmosis water maker and filter linkage control system.

[0004] This application provides a reverse osmosis water maker and filter linkage control system, which adopts the following technical solution: A reverse osmosis water purifier and filter linkage control system includes: The seawater supply and backwashing unit includes a seawater supply pump, a control box, a backwashing pipeline, and a three-way valve. Each water maker is equipped with one seawater supply pump. The seawater supply pump is connected to the main inlet pipeline via a flange. Its motor is electrically connected to the control box to achieve independent start and stop control. The backwashing pipeline is connected to an independent backwashing water source via a three-way valve. When the multi-media filter is backwashed, the corresponding seawater supply pump can be started by the control box to provide backwashing water. The control box integrates a PLC. The high-pressure pump monitoring unit includes a high-pressure pump, a first pressure transmitter installed in the inlet pipe of the high-pressure pump, a second pressure transmitter installed in the outlet pipe of the high-pressure pump, and an alarm module. The first pressure transmitter is used to monitor the inlet pressure and output a prompt signal when the pressure is lower than a first preset value, and triggers equipment shutdown and alarm when it is lower than a second preset value. The second pressure transmitter is used to monitor the outlet pressure and triggers equipment shutdown and alarm when the pressure is higher than a third preset value. The alarm module is used to receive and display abnormal pressure signals. The inlet pipe of the high-pressure pump is connected to the main water inlet pipe, and the high-pressure pump is signal-connected to the control box. The dosing system unit includes a dosing tank, a dosing pump, and a chemical delivery pipeline. A level switch is installed on the top of the dosing tank to monitor the liquid level and issue an alarm signal when the liquid level falls below a set threshold. The dosing pump is connected to the chemical delivery pipeline via a clamp and is signal-connected to the control box. The chemical delivery pipeline splits into two branches: one is a main dosing pipe connected to the main inlet water pipe, and the other is a cleaning dosing branch pipe connected to the inlet side pipeline of the cleaning water pump. A main solenoid valve is installed on the main dosing pipe, and a branch solenoid valve is installed on the cleaning dosing branch pipe. Both the main and branch solenoid valves are signal-connected to the control box. The operation mode switching unit includes a booster pump, a booster pump inlet solenoid valve, a flow sensor, and a mode selection switch. The booster pump inlet solenoid valve is installed in the booster pump inlet pipe to control the start and stop of the booster pump. The flow sensor is installed in the main product water pipeline to monitor the product water flow. The mode selection switch is used to select the primary product water mode or the secondary product water mode. The booster pump is signal-connected to the control box. The self-cleaning filter unit includes a filter body, an electric drain valve, a cleaning water pump, and a dosing linkage controller. The inlet and outlet of the filter body are connected to self-cleaning pipelines via flanges. The electric drain valve is installed at its bottom drain port. The dosing linkage controller is used to control the main solenoid valve to close and the branch solenoid valve to open when the self-cleaning filter starts, and simultaneously start the dosing pump to add chemicals into the self-cleaning circuit. The inlet of the cleaning water pump is connected to the water production side of the filter body via a rigid pipe, and the outlet is connected to the drain port of the filter body via a rigid pipe. The dosing linkage controller is used to start the dosing pump when the self-cleaning filter starts. The electric drain valve is opened by timed control of a PLC. When it is opened, the cleaning water pump starts synchronously to form a reverse flushing water flow. The cleaning water pump is signal-connected to the control box. A multi-media filter unit includes a filter tank filled with quartz sand filter media.

[0005] As a preferred technical solution of this application, each water generator independently controls the start and stop of its seawater supply pump through a corresponding control box, and during the backwashing of the filter body, a separate seawater supply pump matched with the filter body is started to provide additional water supply.

[0006] As a preferred technical solution of this application, the first preset value is 1.5 bar, the second preset value is 1 bar, and the third preset value is 64 bar. When the inlet pressure is lower than 1.5 bar, the PLC outputs a prompt signal to the control cabinet to indicate that the filter element needs to be replaced. When the inlet pressure is lower than 1 bar or the outlet pressure is higher than 64 bar, the PLC triggers a stop command and controls the alarm module to issue an audible and visual alarm.

[0007] As a preferred technical solution of this application, the liquid level switch is a float-type reed switch. When the liquid level is lower than 10% of the total volume of the dosing tank, the reed switch outputs an alarm signal to the indicator light circuit of the control cabinet, and the equipment maintains normal operation.

[0008] As a preferred technical solution of this application, the operation mode switching unit is configured as follows: In the first-level water production mode, the inlet solenoid valve of the booster pump is closed and the booster pump does not start. When the salinity of the produced water is qualified, the first fresh water outlet is opened through the dedicated solenoid valve to discharge water from the first fresh water outlet. When the salinity of the produced water is unqualified, the first fresh water outlet is closed through the dedicated solenoid valve, and the first seawater outlet is opened through the dedicated solenoid valve to discharge unqualified water from the first seawater outlet. When the produced water is unqualified, the equipment will output an alarm signal through the PLC after a 5-minute delay. In the secondary water production mode, the inlet solenoid valve of the booster pump is opened. When the primary water production flow rate is greater than 1 m³ / h, the PLC starts the booster pump, and the first freshwater outlet is closed through a dedicated solenoid valve. When the salinity of the produced water is qualified, the second freshwater outlet is opened through a dedicated solenoid valve. When the salinity of the produced water is unqualified, the second freshwater outlet is closed through a dedicated solenoid valve, and the second seawater outlet is opened through a dedicated solenoid valve. Unqualified water is discharged from the second seawater outlet. When the produced water is unqualified, the equipment outputs an alarm signal through the PLC after a 5-minute delay.

[0009] As a preferred technical solution of this application, the quartz sand filter media filled in the filter tank has a particle size of 0.5~1.2mm.

[0010] As a preferred technical solution of this application, the cleaning water pump and the dosing pump are started synchronously through the dosing linkage controller, and the agent dosing pipeline is switched to the self-cleaning circuit synchronously when the self-cleaning is started.

[0011] In summary, this application includes at least one of the following beneficial technical effects of the reverse osmosis water maker and filter linkage control system: This application, through integrated PLC control and multi-unit linkage design, achieves highly efficient and automated operation of the reverse osmosis water maker and filter system. The system possesses an independently controllable seawater supply and backwashing mechanism, enabling precise activation of corresponding pumps during multi-media filter backwashing to avoid interference with the main process. The high-pressure pump monitoring unit monitors inlet and outlet pressures in real time via dual pressure transmitters, combined with tiered alarms and automatic shutdown functions to effectively prevent equipment damage risks. The chemical dosing system ensures continuous chemical supply through level warnings and linked dosing. The chemical dosing system employs a dual-branch solenoid valve switching design, ensuring both the supply and maintenance of the water maker under normal water production conditions. The water-based chemical dosing system enables precise entry of chemicals into the cleaning loop during self-cleaning operation, solving the problem of single-pipeline dosing failing to achieve integrated cleaning, and further improving the self-cleaning effect and system automation level. The system offers flexible and switchable operating modes, supporting adaptive control of primary / secondary product water, and intelligent judgment and diversion of product water quality through salinity and flow sensors. The self-cleaning filter works in conjunction with the multi-media filter, combining timed or differential pressure-triggered automatic backwashing and chemical dosing cleaning linkage, significantly improving filtration efficiency and membrane lifespan. This application, while improving product water quality and stability, reduces the intensity of manual intervention and maintenance costs. Attached Figure Description

[0012] Figure 1 This is a simplified architecture diagram of the system in this application; Figure 2 This is a detailed architecture diagram of the system in this application; Figure 3 This is the connection diagram of the system control circuit of this application. Detailed Implementation

[0013] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail.

[0014] See Figures 1-3 A reverse osmosis water maker and filter linkage control system, comprising: The seawater supply and backwashing unit includes a seawater supply pump, a control box, a backwashing pipeline, and a three-way valve. Each water maker is equipped with one seawater supply pump. The seawater supply pump is connected to the main inlet pipeline through a flange. Its motor is electrically connected to the control box to achieve independent start and stop control. The backwashing pipeline is connected to an independent backwashing water source through a three-way valve. When the multi-media filter is backwashed, the corresponding seawater supply pump can be started by the control box to provide backwashing water. The control box integrates a PLC. The high-pressure pump monitoring unit includes a high-pressure pump, a first pressure transmitter installed on the inlet pipe of the high-pressure pump, a second pressure transmitter installed on the outlet pipe of the high-pressure pump, and an alarm module. The first pressure transmitter is used to monitor the inlet pressure and output a prompt signal when the pressure is lower than a first preset value, and triggers equipment shutdown and alarm when it is lower than a second preset value. The second pressure transmitter is used to monitor the outlet pressure and triggers equipment shutdown and alarm when the pressure is higher than a third preset value. The alarm module is used to receive and display abnormal pressure signals. The inlet pipe of the high-pressure pump is connected to the main water inlet pipe, and the high-pressure pump is connected to the control box via signal connection. The dosing system unit includes a dosing tank, a dosing pump, and a chemical delivery pipeline. A level switch is installed on the top of the dosing tank to monitor the liquid level and issue an alarm signal when the liquid level is lower than a set threshold. The dosing pump is connected to the chemical delivery pipeline by a clamp and is connected to the control box via signal. The end of the chemical delivery pipeline is divided into two paths: one is the main dosing pipe connected to the main water inlet pipe, and the other is the cleaning dosing branch pipe connected to the inlet side pipeline of the cleaning water pump. A main solenoid valve is installed on the main dosing pipe, and a branch solenoid valve is installed on the cleaning dosing branch pipe. Both the main solenoid valve and the branch solenoid valve are connected to the control box via signal. The operation mode switching unit includes a booster pump, a booster pump inlet solenoid valve, a flow sensor, and a mode selection switch. The booster pump inlet solenoid valve is installed in the booster pump inlet pipe to control the start and stop of the booster pump. The flow sensor is installed in the main product water pipeline to monitor the product water flow. The mode selection switch is used to select the primary product water mode or the secondary product water mode. The booster pump is connected to the control box via signal. The self-cleaning filter unit includes a filter body, an electric drain valve, a cleaning water pump, and a dosing linkage controller. The inlet and outlet of the filter body are connected to the self-cleaning pipeline via flanges. The electric drain valve is installed at the bottom drain port. The dosing linkage controller is used to control the main solenoid valve to close and the branch solenoid valve to open when the self-cleaning filter starts, and to simultaneously start the dosing pump to add chemicals into the self-cleaning circuit. The inlet of the cleaning water pump is connected to the product water side of the filter body via a rigid pipe, and the outlet is connected to the drain port of the filter body via a rigid pipe. The dosing linkage controller is used to start the dosing pump when the self-cleaning filter starts. The electric drain valve is opened by timed control of the PLC. When it is opened, the cleaning water pump starts simultaneously to form a reverse flushing water flow. The cleaning water pump is connected to the control box via signal. A multi-media filter unit includes a filter tank filled with quartz sand filter media.

[0015] The core function of the seawater supply and backwashing unit is to provide a stable seawater supply for the reverse osmosis water production process and to provide an additional flushing water source when the multi-media filter needs backwashing. This unit includes a seawater supply pump, a control box, backwashing pipelines, and a three-way valve. In practical applications, each water maker is independently equipped with a seawater supply pump to ensure the exclusivity and controllability of the water supply. The seawater supply pump is firmly installed on the main inlet pipeline through a flange connection. This connection method not only ensures sealing but also facilitates maintenance and replacement. The motor of the seawater supply pump is electrically connected to the control box, which integrates a programmable logic controller (PLC). The PLC realizes independent start and stop control of each seawater supply pump through preset programs. This means that the operator can start or stop any seawater supply pump individually through the control box interface without affecting the operation of other water makers, thereby improving the flexibility and reliability of the system. The backwash pipeline is connected to an independent backwash water source via a three-way valve. The backwash water source is usually clean seawater or pre-treated water to ensure the backwashing effect. When the multi-media filter needs backwashing, the PLC in the control box will issue a command to first adjust the on / off state of the three-way valve to direct the water flow to the backwash pipeline. At the same time, the PLC will start the seawater supply pump corresponding to the multi-media filter to provide additional backwash water. This design avoids interference with the normal water production process during the backwashing process because the backwash water is supplied by a dedicated pump and does not occupy the water volume of the main water supply pipeline. As the core of the unit, the control box is not only responsible for starting and stopping the pump, but also monitors the operating status of the seawater supply pump in real time through the PLC, such as current, voltage and fault signals, to ensure the stable operation of the pump. If an abnormality is detected, the PLC will immediately trigger an alarm and execute a shutdown procedure to prevent equipment damage.

[0016] The high-pressure pump monitoring unit is responsible for increasing the inlet water pressure to ensure the efficient operation of the reverse osmosis membrane. This unit includes a high-pressure pump, a first pressure transmitter, a second pressure transmitter, and an alarm module. The inlet pipe of the high-pressure pump is connected to the main inlet water pipe to receive pretreated seawater. The first pressure transmitter is installed on the inlet pipe of the high-pressure pump to monitor the inlet pressure in real time. The second pressure transmitter is installed on the outlet pipe of the high-pressure pump to monitor the outlet pressure. Both pressure transmitters use high-precision sensors that can convert pressure signals into electrical signals and transmit them to the PLC in the control box. The PLC continuously analyzes pressure data and executes corresponding operations based on preset values. The first preset value is set at 1.5 bar. When the inlet pressure is lower than this value, the PLC outputs a warning signal to the control cabinet display, showing a warning message to replace the filter element, prompting operators to check or replace the pretreatment filter element to prevent damage to the high-pressure pump due to insufficient air intake or flow. The second preset value is set at 1 bar. When the inlet pressure further drops below 1 bar, it indicates a severe water supply shortage. The PLC immediately triggers a shutdown command and issues an audible and visual alarm through the alarm module to ensure equipment safety. On the other hand, the third preset value is set at 64 bar. When the outlet pressure is higher than this value, it indicates that the reverse osmosis membrane may be clogged or the system resistance is too high. The PLC will also trigger a shutdown and alarm. The alarm module typically includes indicator lights and a buzzer to visually display the specific type of pressure abnormality (such as low inlet pressure or high outlet pressure), facilitating quick problem identification by operators. The high-pressure pump is connected to the control box via a signal connection. The PLC can also automatically adjust the speed of the high-pressure pump according to pressure changes to maintain stable operating pressure, thereby improving energy efficiency and system lifespan.

[0017] The chemical dosing system unit is used to add chemicals to the reverse osmosis water production process to prevent scaling, microbial growth, or improve water quality. This unit includes a dosing tank, a dosing pump, and chemical delivery pipelines. The dosing tank is typically made of corrosion-resistant materials and has a level switch on top to monitor the chemical level. The level switch uses a float-type reed switch design. Its working principle is as follows: the float rises and falls with the liquid level. When the liquid level is below 10% of the total volume of the dosing tank, the float actuates the reed switch, outputting a switching signal to the control box. Upon receiving the signal, the control box triggers the indicator light circuit on the control cabinet, displaying a "low level alarm," but the equipment continues to operate normally to avoid frequent shutdowns. Operators can add chemicals promptly based on the alarm to ensure continuous dosing. The dosing pump is fixed to the chemical delivery pipeline via clamps. This connection facilitates quick disassembly and cleaning, preventing chemical residue. The dosing pump is connected to the control box via signal transmission, and the PLC can control the start / stop and dosing amount of the dosing pump based on the water maker's operating status (such as flow rate or time). The chemical delivery pipeline ends in two branches: one is the main dosing pipe, connected to the main inlet pipeline via a main solenoid valve; the other is a cleaning dosing branch pipe, connected to the inlet pipeline of the cleaning water pump via a branch solenoid valve.

[0018] During normal water production operation, the main solenoid valve is open and the branch solenoid valve is closed, and the chemicals are evenly added to the main inlet pipeline. When the water maker starts, the PLC automatically starts the dosing pump. When the machine stops, the dosing pump is delayed in closing to flush the pipeline.

[0019] The dosing system unit also has a linkage function. For example, when the self-cleaning filter is started, the dosing pump is started synchronously through the dosing linkage controller, and the main solenoid valve is closed and the branch solenoid valve is opened synchronously. This allows the chemical to be added to the inlet side of the cleaning water pump through the cleaning dosing branch pipe and enter the self-cleaning circuit inside the filter with the cleaning water flow to enhance the cleaning effect. The design of the entire unit ensures the accurate dosing of the chemical and extends the service life of the reverse osmosis membrane.

[0020] The operation mode switching unit allows the reverse osmosis water maker to flexibly switch between primary and secondary water production modes to adapt to different water quality requirements. This unit includes a booster pump, a booster pump inlet solenoid valve, a flow sensor, and a mode selection switch. The mode selection switch is usually installed on the control box panel. The operator can manually select the primary or secondary water production mode. The PLC controls the opening and closing state of the booster pump inlet solenoid valve according to the mode selection signal. The booster pump inlet solenoid valve is installed on the booster pump inlet pipe and serves as the actuator for starting and stopping the booster pump. In the primary water production mode, the booster pump inlet solenoid valve is closed and the booster pump does not start. At this time, the reverse osmosis water maker relies solely on the high-pressure pump for primary desalination. The flow sensor on the main water production line monitors the water production flow in real time and transmits the data to the PLC. At the same time, the salinity sensor detects the salinity of the water production. When the salinity is within acceptable limits (i.e., below the set threshold), the PLC outputs a signal to open the dedicated solenoid valve of the first freshwater outlet, and the qualified water production is discharged from the first freshwater outlet. When the salinity is unacceptable, the PLC closes the first freshwater outlet solenoid valve and opens the dedicated solenoid valve of the first seawater outlet, and the unacceptable water is discharged from the first seawater outlet. If the salinity of the water production remains unacceptable for more than 5 minutes, the PLC will output an alarm signal to prompt the operator to check the system. In the secondary water production mode, the inlet solenoid valve of the booster pump is opened. When the flow sensor detects that the primary water production flow rate is greater than 1 m³ / h, the PLC automatically starts the booster pump to perform secondary pressurization and desalination of the primary water production. At this time, the first freshwater outlet solenoid valve is closed, and the water production enters the secondary treatment stage. The salinity sensor continues to monitor the final water salinity: if the salinity is qualified, the PLC opens the second freshwater outlet solenoid valve, and qualified water is discharged from the second freshwater outlet; if it is unqualified, the PLC closes the second freshwater outlet solenoid valve and opens the second seawater outlet solenoid valve, and unqualified water is discharged from the second seawater outlet. Similarly, if the water production is unqualified for more than 5 minutes, an alarm will be triggered. This mode switching design realizes the step control of water production quality, improving the adaptability and efficiency of the system.

[0021] The self-cleaning filter unit is used to remove suspended particles in the influent and protect downstream equipment. The unit includes a filter body, an electric drain valve, a cleaning water pump and a dosing linkage controller. The inlet and outlet of the filter body are connected to the self-cleaning pipeline through flanges to form a circulating cleaning loop. The electric drain valve is installed at the drain port at the bottom of the filter body and is opened by timed control of PLC. For example, the PLC can be set to automatically open the electric drain valve once every 8 hours of operation, or trigger cleaning according to the differential pressure signal. When the self-cleaning process starts, the PLC first instructs the electric drain valve to open and simultaneously starts the cleaning water pump. The inlet of the cleaning water pump is connected to the water production side of the filter body through a rigid pipe, and the outlet is connected to the drain outlet through a rigid pipe. The cleaning water pump draws clean water from the water production side to form a reverse flushing water flow, which flushes from the inside of the filter outward and discharges the trapped impurities from the drain outlet. The cleaning water pump is connected to the control box signal, and the PLC ensures that the cleaning process lasts for 1-2 minutes, and then automatically shuts off the electric drain valve and the cleaning water pump. The dosing linkage controller is used to coordinate the dosing system during the self-cleaning process. When self-cleaning starts, the controller receives a signal from the PLC, synchronously switches the chemical dosing pipeline, and starts the dosing pump to add cleaning agent or disinfectant to the cleaning water, enhancing the cleaning effect. After self-cleaning is completed, the dosing pump stops first, the branch solenoid valve closes, and the main solenoid valve reopens, returning to normal product water dosing status. This linkage design avoids errors from manual operation and improves the degree of automation. The self-cleaning filter unit is also equipped with a differential pressure sensor. When the pressure difference across the filter exceeds a set value, the PLC can start the cleaning program in advance to prevent filter clogging.

[0022] The multi-media filter unit is used to further purify seawater and extend the life of the reverse osmosis membrane. The unit includes a filter tank filled with quartz sand filter media. The particle size of the quartz sand filter media is strictly controlled between 0.5 and 1.2 mm. This particle size distribution provides good filtration accuracy and flux balance. Smaller particle size (0.5 mm) sand particles can capture fine particles, while larger particle size (1.2 mm) sand particles form a support layer to prevent filter bed caking. The filter tank is typically made of fiberglass or carbon steel and is internally designed with a water distributor and a water collector to ensure that water flows evenly through the filter media layer. During normal operation, seawater enters from the top of the tank, is filtered through the quartz sand filter media layer, and flows out from the bottom. As the operating time increases, the impurities trapped in the filter media layer increase, requiring backwashing. During backwashing, the control box commands the corresponding seawater supply pump to provide a high-pressure water flow from the bottom of the tank to backwash the filter media, allowing impurities to be discharged from the top drain port. The backwashing frequency and duration are automatically controlled by the PLC based on flow rate or time parameters, for example, backwashing for 10 minutes every 24 hours. The multi-media filter unit and the self-cleaning filter unit work together to form a multi-stage filtration barrier, ensuring stable influent water quality.

[0023] Each water generator independently controls the start and stop of its seawater supply pump through a corresponding control box, and during backwashing of the filter body, a separate seawater supply pump matched with the filter body is started to provide additional water supply.

[0024] The first preset value is 1.5 bar, the second preset value is 1 bar, and the third preset value is 64 bar. When the inlet pressure is lower than 1.5 bar, the PLC outputs a prompt signal to the control cabinet to indicate that the filter element needs to be replaced. When the inlet pressure is lower than 1 bar or the outlet pressure is higher than 64 bar, the PLC triggers a stop command and controls the alarm module to issue an audible and visual alarm.

[0025] The liquid level switch is a float-type reed switch. When the liquid level is lower than 10% of the total volume of the dosing tank, the reed switch outputs an alarm signal to the indicator light circuit of the control cabinet, and the equipment maintains normal operation.

[0026] The operation mode switching unit is configured as follows: In the primary water production mode, the booster pump inlet solenoid valve is closed, the booster pump does not start, and when the salinity of the produced water is qualified, the first freshwater outlet opens through a dedicated solenoid valve to discharge water from the first freshwater outlet. When the salinity of the produced water is unqualified, the first freshwater outlet closes through a dedicated solenoid valve, and the first seawater outlet opens through a dedicated solenoid valve to discharge unqualified water from the first seawater outlet. If the produced water is unqualified, the equipment will output an alarm signal to the PLC after a 5-minute delay. In the secondary water production mode, the booster pump inlet solenoid valve is open. When the primary water production flow rate is greater than 1 m³ / h, the PLC starts the booster pump, the first freshwater outlet closes through a dedicated solenoid valve, and when the salinity of the produced water is qualified, the second freshwater outlet opens through a dedicated solenoid valve. When the salinity of the produced water is unqualified, the second freshwater outlet closes through a dedicated solenoid valve, and the second seawater outlet opens through a dedicated solenoid valve to discharge unqualified water from the second seawater outlet. If the produced water is unqualified, the equipment will output an alarm signal to the PLC after a 5-minute delay.

[0027] The quartz sand filter media filled in the filter tank has a particle size of 0.5~1.2mm.

[0028] The cleaning water pump and the chemical dosing pump are started synchronously through a chemical dosing linkage controller, and the chemical dosing pipeline is switched to the self-cleaning circuit synchronously when the self-cleaning starts.

[0029] This application, through integrated PLC control and multi-unit linkage design, achieves highly efficient and automated operation of the reverse osmosis water maker and filter system. The system possesses an independently controllable seawater supply and backwashing mechanism, enabling precise activation of corresponding pumps during multi-media filter backwashing to avoid interference with the main process. The high-pressure pump monitoring unit monitors inlet and outlet pressures in real time via dual pressure transmitters, combined with tiered alarms and automatic shutdown functions to effectively prevent equipment damage risks. The chemical dosing system ensures continuous chemical supply through level warnings and linked dosing. The chemical dosing system employs a dual-branch solenoid valve switching design, ensuring both the supply and maintenance of the water maker under normal water production conditions. The water-based chemical dosing system enables precise entry of chemicals into the cleaning loop during self-cleaning operation, solving the problem of single-pipeline dosing failing to achieve integrated cleaning, and further improving the self-cleaning effect and system automation level. The system offers flexible and switchable operating modes, supporting adaptive control of primary / secondary product water, and intelligent judgment and diversion of product water quality through salinity and flow sensors. The self-cleaning filter works in conjunction with the multi-media filter, combining timed or differential pressure-triggered automatic backwashing and chemical dosing cleaning linkage, significantly improving filtration efficiency and membrane lifespan. This application, while improving product water quality and stability, reduces the intensity of manual intervention and maintenance costs.

[0030] 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 reverse osmosis water maker and filter linkage control system, characterized in that, include: The seawater supply and backwashing unit includes a seawater supply pump, a control box, a backwashing pipeline, and a three-way valve. Each water maker is equipped with one seawater supply pump. The seawater supply pump is connected to the main inlet pipeline via a flange. Its motor is electrically connected to the control box to achieve independent start and stop control. The backwashing pipeline is connected to an independent backwashing water source via a three-way valve. When the multi-media filter is backwashed, the corresponding seawater supply pump can be started by the control box to provide backwashing water. The control box integrates a PLC. The high-pressure pump monitoring unit includes a high-pressure pump, a first pressure transmitter installed in the inlet pipe of the high-pressure pump, a second pressure transmitter installed in the outlet pipe of the high-pressure pump, and an alarm module. The first pressure transmitter is used to monitor the inlet pressure and output a prompt signal when the pressure is lower than a first preset value, and triggers equipment shutdown and alarm when it is lower than a second preset value. The second pressure transmitter is used to monitor the outlet pressure and triggers equipment shutdown and alarm when the pressure is higher than a third preset value. The alarm module is used to receive and display abnormal pressure signals. The inlet pipe of the high-pressure pump is connected to the main water inlet pipe, and the high-pressure pump is signal-connected to the control box. The dosing system unit includes a dosing tank, a dosing pump, and a chemical delivery pipeline. A level switch is installed on the top of the dosing tank to monitor the liquid level and issue an alarm signal when the liquid level falls below a set threshold. The dosing pump is connected to the chemical delivery pipeline via a clamp and is signal-connected to the control box. The chemical delivery pipeline splits into two branches: one is a main dosing pipe connected to the main inlet water pipe, and the other is a cleaning dosing branch pipe connected to the inlet side pipeline of the cleaning water pump. A main solenoid valve is installed on the main dosing pipe, and a branch solenoid valve is installed on the cleaning dosing branch pipe. Both the main and branch solenoid valves are signal-connected to the control box. The operation mode switching unit includes a booster pump, a booster pump inlet solenoid valve, a flow sensor, and a mode selection switch. The booster pump inlet solenoid valve is installed in the booster pump inlet pipe to control the start and stop of the booster pump. The flow sensor is installed in the main product water pipeline to monitor the product water flow. The mode selection switch is used to select the primary product water mode or the secondary product water mode. The booster pump is signal-connected to the control box. The self-cleaning filter unit includes a filter body, an electric drain valve, a cleaning water pump, and a dosing linkage controller. The inlet and outlet of the filter body are connected to self-cleaning pipelines via flanges. The electric drain valve is installed at its bottom drain port. The dosing linkage controller is used to control the main solenoid valve to close and the branch solenoid valve to open when the self-cleaning filter starts, and simultaneously start the dosing pump to add chemicals into the self-cleaning circuit. The inlet of the cleaning water pump is connected to the water production side of the filter body via a rigid pipe, and the outlet is connected to the drain port of the filter body via a rigid pipe. The dosing linkage controller is used to start the dosing pump when the self-cleaning filter starts. The electric drain valve is opened by timed control of a PLC. When it is opened, the cleaning water pump starts synchronously to form a reverse flushing water flow. The cleaning water pump is signal-connected to the control box. A multi-media filter unit includes a filter tank filled with quartz sand filter media.

2. The reverse osmosis water maker and filter linkage control system according to claim 1, characterized in that, Each water generator independently controls the start and stop of its seawater supply pump through a corresponding control box, and during backwashing of the filter body, a separate seawater supply pump matched with the filter body is started to provide additional water supply.

3. The reverse osmosis water maker and filter linkage control system according to claim 1, characterized in that, The first preset value is 1.5 bar, the second preset value is 1 bar, and the third preset value is 64 bar. When the inlet pressure is lower than 1.5 bar, the PLC outputs a prompt signal to the control cabinet to indicate that the filter element needs to be replaced. When the inlet pressure is lower than 1 bar or the outlet pressure is higher than 64 bar, the PLC triggers a stop command and controls the alarm module to issue an audible and visual alarm.

4. The reverse osmosis water maker and filter linkage control system according to claim 1, characterized in that, The liquid level switch is a float-type reed switch. When the liquid level is lower than 10% of the total volume of the dosing tank, the reed switch outputs an alarm signal to the indicator light circuit of the control cabinet, and the equipment maintains normal operation.

5. The reverse osmosis water maker and filter linkage control system according to claim 1, characterized in that, The operating mode switching unit is configured as follows: In the first-level water production mode, the inlet solenoid valve of the booster pump is closed and the booster pump does not start. When the salinity of the produced water is qualified, the first fresh water outlet is opened through the dedicated solenoid valve to discharge water from the first fresh water outlet. When the salinity of the produced water is unqualified, the first fresh water outlet is closed through the dedicated solenoid valve, and the first seawater outlet is opened through the dedicated solenoid valve to discharge unqualified water from the first seawater outlet. When the produced water is unqualified, the equipment will output an alarm signal through the PLC after a 5-minute delay. In the secondary water production mode, the inlet solenoid valve of the booster pump is opened. When the primary water production flow rate is greater than 1 m³ / h, the PLC starts the booster pump, and the first freshwater outlet is closed through a dedicated solenoid valve. When the salinity of the produced water is qualified, the second freshwater outlet is opened through a dedicated solenoid valve. When the salinity of the produced water is unqualified, the second freshwater outlet is closed through a dedicated solenoid valve, and the second seawater outlet is opened through a dedicated solenoid valve. Unqualified water is discharged from the second seawater outlet. When the produced water is unqualified, the equipment outputs an alarm signal through the PLC after a 5-minute delay.

6. The reverse osmosis water maker and filter linkage control system according to claim 1, characterized in that, The quartz sand filter media filled in the filter tank has a particle size of 0.5~1.2mm.

7. The reverse osmosis water maker and filter linkage control system according to claim 1, characterized in that, The cleaning water pump and the dosing pump are started synchronously through the dosing linkage controller, and the agent dosing pipeline is switched to the self-cleaning circuit synchronously when the self-cleaning is started.

Images