PLC-based electric water filter pollution discharge control method and system

Abstract

The invention relates to a PLC-based electric water filter pollution discharge control method and system, and the method comprises the steps: carrying out the system initialization of a PLC, synchronously starting a timing control module and a pressure difference control module, and generating a timing pollution discharge signal and a pressure difference pollution discharge signal; the method comprises the following steps: receiving a timing pollution discharge signal and a pressure difference pollution discharge signal through a PLC, making a pollution discharge decision according to the signal type and the current state of a system, starting a pollution discharge flow when any pollution discharge signal is triggered and the system is in a non-pollution discharge state, monitoring the state of a pollution discharge valve and the pressure difference change in the pollution discharge process, and controlling the pollution discharge flow. And an abnormal alarm is triggered when the pressure difference is not recovered to a normal range within a set time. By combining cooperative work of a double-signal triggering mechanism of a timing sewage discharge signal and a pressure difference sewage discharge signal, the regularity of system operation is guaranteed, the adaptability to sudden working conditions is achieved, through adjustable parameter design and a real-time monitoring function, the self-optimization and fault diagnosis capacity is achieved, the sewage discharge efficiency can be better improved, and the system is suitable for popularization and application. And thus, the optimal pollution discharge state is achieved.

Description

PLC-based method and system for controlling the blowdown of electric water filters Technical Field

[0001] This invention relates to the field of sewage control technology, and in particular to a PLC-based method and system for controlling sewage discharge from an electric water filter. Background Technology

[0002] Electric water filters play a crucial role in filtering impurities in industrial water circulation systems, and their wastewater control performance directly impacts system stability and energy consumption. Existing wastewater control methods often employ single-dimensional control strategies, which are ill-suited to complex and variable operating conditions. On the one hand, fixed-cycle wastewater discharge cannot accurately reflect the actual degree of filter clogging, easily leading to water waste or insufficient discharge. On the other hand, triggering mechanisms based on single operating parameters experience significant reliability reductions when equipment ages or operating conditions fluctuate.

[0003] Therefore, how to provide an intelligent control method that simultaneously takes into account the regularity of system operation and adaptability to operating conditions to achieve the optimal state of filtration efficiency has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This invention provides a PLC-based method and system for controlling the sewage discharge of an electric water filter, which addresses the shortcomings of existing technologies that cannot simultaneously consider the regularity of system operation and adaptability to working conditions, resulting in the difficulty in achieving optimal sewage discharge efficiency.

[0005] On one hand, this invention provides a PLC-based method for controlling the sewage discharge of an electric water filter, comprising: initializing the PLC system and simultaneously starting a timing control module and a differential pressure control module; generating a timing sewage discharge signal according to an adjustable timing cycle through the timing control module; acquiring the inlet and outlet pressure difference of the water filter in real time through the differential pressure control module, and generating a differential pressure sewage discharge signal when the inlet and outlet pressure difference exceeds a set threshold; receiving the timing sewage discharge signal and the differential pressure sewage discharge signal through the PLC, and making a sewage discharge decision based on the signal type and the current system state; initiating the sewage discharge process through the PLC when any sewage discharge signal is triggered and the system is in a non-sewage discharge state; and monitoring the status of the sewage discharge valve and the change in differential pressure through the PLC during the sewage discharge process, and triggering an abnormal alarm when the differential pressure fails to return to the normal range within a set time.

[0006] According to the present invention, a PLC-based method for controlling the sewage discharge of an electric water filter includes the following steps: making a sewage discharge decision based on the signal type and the current system state; verifying the validity of received timed sewage discharge signals and differential pressure sewage discharge signals through the PLC, and excluding instantaneous signals whose duration has not reached the stability requirement; determining, through the PLC, whether the system is currently in a sewage discharge state, a shutdown state, or a fault state based on the result of the validity verification; and generating corresponding control commands through the PLC based on the result of the system state determination, including immediate execution, delayed execution, or ignoring the signal.

[0007] According to the present invention, a PLC-based method for controlling the discharge of an electric water filter includes generating corresponding control commands via the PLC, comprising: establishing a state priority matrix via the PLC, wherein the differential pressure exceedance signal has a higher priority than the timed trigger signal; based on the state priority matrix, performing signal arbitration via the PLC when multiple discharge signals are received; and, according to the result of the signal arbitration, selecting to execute immediate discharge, queue waiting, or cancel the duplicate request via the PLC.

[0008] According to the present invention, a PLC-based method for controlling the sewage discharge of an electric water filter includes a method for arbitrating signals when multiple sewage discharge signals are received via the PLC. This method includes: recording the trigger time and signal type of each sewage discharge signal via the PLC; comparing the priorities of simultaneously arriving signals via the PLC based on the recorded signal information; and processing signals of the same priority according to a first-in-first-out (FIFO) principle via the PLC based on the result of the priority comparison.

[0009] According to the present invention, a PLC-based method for controlling the sewage discharge of an electric water filter includes, after recording the trigger time and signal type of each sewage discharge signal by the PLC, the method further includes: based on the recorded signal information, using the PLC to count the trigger frequency of each type of signal per unit time; according to the trigger frequency statistics, using the PLC to dynamically adjust the length of the timing cycle and the magnitude of the differential pressure threshold; and based on the results of the dynamic adjustment, using the PLC to initiate a system self-test program when the frequency is abnormal to investigate potential faults.

[0010] According to the present invention, a PLC-based method for controlling the sewage discharge of an electric water filter includes the following steps: determining, via the PLC, whether the signal arbitration result is an immediate sewage discharge command; if it is, starting the sewage discharge valve and setting a sewage discharge status flag; monitoring the completion of the sewage discharge process via the PLC based on the sewage discharge status flag, and resetting the flag after sewage discharge is completed; adding the current request to the waiting queue and processing it sequentially when the determination result is a waiting command; and discarding the current signal and recording the reason for discarding if the signal arbitration result is a cancellation of a duplicate request.

[0011] According to the present invention, a PLC-based method for controlling the sewage discharge of an electric water filter further includes: monitoring the cumulative operating time of the water filter using a PLC, and generating a maintenance reminder signal when a preset maintenance cycle is reached; automatically switching to a standby water filter operation using a PLC based on the maintenance reminder signal; and controlling the faulty water filter to enter an isolation and maintenance state using a PLC according to the switching result.

[0012] According to the present invention, a PLC-based method for controlling the sewage discharge of an electric water filter further includes: establishing a graded alarm mechanism through the PLC, including early warning, alarm, and emergency alarm; triggering alarms of corresponding levels through the PLC according to the severity of the fault based on the graded alarm mechanism; and executing corresponding handling measures through the PLC according to the alarm level, including automatic downgrade operation, switching to backup equipment, or emergency shutdown.

[0013] According to the present invention, a PLC-based method for controlling the sewage discharge of an electric water filter further includes: monitoring the operating status of the tailwater cooler through a PLC to obtain cooling efficiency parameters; determining, through a PLC, whether the cooler has scale buildup or blockage based on the cooling efficiency parameters; and adjusting the sewage discharge frequency or initiating a backwashing procedure through a PLC according to the determination result.

[0014] Secondly, this invention provides a PLC-based electric water filter sewage discharge control system, comprising: a synchronization module for initializing the PLC and synchronously starting a timing control module and a differential pressure control module; a generation module for generating a timing sewage discharge signal according to an adjustable timing period through the timing control module; a differential pressure control module for real-time acquisition of the inlet and outlet pressure difference of the water filter, and generating a differential pressure sewage discharge signal when the inlet and outlet pressure difference exceeds a set threshold; a decision module for receiving the timing sewage discharge signal and the differential pressure sewage discharge signal through the PLC, and making a sewage discharge decision based on the signal type and the current system state; a sewage discharge module for initiating the sewage discharge process through the PLC when any sewage discharge signal is triggered and the system is in a non-sewage discharge state; and an alarm module for monitoring the sewage discharge valve status and differential pressure changes through the PLC during the sewage discharge process, and triggering an abnormal alarm when the differential pressure does not return to the normal range within a set time.

[0015] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the PLC-based electric water filter sewage control method as described above.

[0016] Fourthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the PLC-based electric water filter sewage control method as described above.

[0017] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the PLC-based electric water filter sewage control method as described above.

[0018] The present invention provides a PLC-based method and system for controlling the blowdown of an electric water filter, comprising: initializing the PLC system and simultaneously starting a timing control module and a differential pressure control module; generating a timing blowdown signal according to an adjustable timing cycle through the timing control module; acquiring the inlet and outlet pressure difference of the water filter in real time through the differential pressure control module, and generating a differential pressure blowdown signal when the inlet and outlet pressure difference exceeds a set threshold; receiving the timing blowdown signal and the differential pressure blowdown signal through the PLC, and making a blowdown decision based on the signal type and the current system state; initiating the blowdown process through the PLC when any blowdown signal is triggered and the system is in a non-blowdown state; monitoring the status of the blowdown valve and the change in differential pressure during the blowdown process through the PLC, and triggering an abnormal alarm when the differential pressure does not return to the normal range within a set time. The combined use of the dual-signal triggering mechanism of the timing blowdown signal and the differential pressure blowdown signal ensures both the regularity of system operation and adaptability to sudden operating conditions. Through adjustable parameter design and real-time monitoring functions, it possesses self-optimization and fault diagnosis capabilities, thereby improving blowdown efficiency and achieving optimal blowdown state. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 is a flowchart illustrating the PLC-based electric water filter sewage control method provided in this embodiment; Figure 2 is a structural diagram illustrating the PLC-based electric water filter sewage control system provided in this embodiment; Figure 3 is a structural diagram illustrating the electronic device provided in this embodiment. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] Figure 1 is a schematic flowchart of the PLC-based electric water filter sewage control method provided in this embodiment.

[0023] As shown in Figure 1, this embodiment provides a PLC-based electric water filter sewage control method applied to the technical water supply system of a hydropower station. This system is specifically designed to provide cooling water for the generator thrust, upper guide, lower guide bearings, air cooler, and turbine water guide bearings, employing two water supply methods: pressure pipe depressurization and water pump pumping. Each unit is equipped with two electric water filters (whose core function is to filter impurities in the water flow and maintain water quality), two centrifugal water pumps (using a 1-operation, 1-standby mode), and two coolers. When supplied by pressure pipes, the water flows through the electric water filters, is depressurized by a pressure reducing valve (a safety valve is installed after depressurization to prevent damage to the equipment from excessive pressure), and is then supplied to the unit, ultimately discharged to the tailrace. When supplied by water pumps, the water in the circulating water tank is pressurized by the pumps, cooled by the tailrace cooler, and then supplied to the unit. After the water supply is completed, it flows back to the circulating water tank to form a cycle. The core components relied upon by this control method include the electric water filter body, a PLC control system responsible for controlling the drain valve operation, receiving sensor signals, fault diagnosis and alarm, a pressure sensor detecting the pressure difference between the inlet and outlet of the water filter, a time relay / timing module to realize timed drain control, and an alarm device. The method mainly includes the following steps: 101. Initialize the PLC system and simultaneously start the timing control module and the differential pressure control module.

[0024] Specifically, after powering on the PLC (Programmable Logic Controller), the system parameters are first initialized and configured. This includes restoring basic sewage discharge parameters, such as the default timing cycle and initial differential pressure threshold. The signal acquisition and communication protocol is configured to ensure stable communication with pressure sensors, time relays, alarm devices, and sewage valve actuators. The linkage logic of each component is set to a preset initial state, such as the linkage between sewage valve opening and differential pressure monitoring. Simultaneously, the timing control module and differential pressure control module are started synchronously, putting both modules into a signal acquisition and generation ready state. This ensures the PLC starts operating from a stable initial state, avoiding control errors caused by chaotic initial parameters. Furthermore, the synchronous start of both modules prevents missed or delayed sewage discharge signals caused by delays in a single module, laying the foundation for subsequent dual-signal coordinated control and ensuring the system operates both regularly and responds quickly to changes in operating conditions.

[0025] 102. The timing control module generates a timed sewage discharge signal according to an adjustable timing cycle.

[0026] Specifically, after the timing control module is activated, it begins timing according to a pre-set and flexibly adjustable timing period. This period can be dynamically adjusted according to the actual water supply conditions. For example, when water is supplied through a pressure steel pipe with a lower impurity content, the period can be set longer; when water is supplied through a pump circulation system, impurities tend to accumulate, so the period can be set shorter. When the timing reaches the end of the period, the timing control module automatically generates a timed discharge signal and transmits it to the main control unit of the PLC control system through a preset communication link. The timed discharge signal ensures that the water filter performs basic discharge according to a fixed pattern, avoiding filter clogging due to prolonged lack of discharge, which affects the water supply flow. At the same time, the adjustable period design can adapt to the differences in impurity content under different water supply methods, reducing unnecessary water waste and balancing the regularity of system operation with adaptability to different operating conditions.

[0027] 103. The differential pressure control module collects the pressure difference between the inlet and outlet of the water filter in real time, and generates a differential pressure discharge signal when the pressure difference between the inlet and outlet exceeds the set threshold.

[0028] Specifically, after the differential pressure control module is activated, it receives pressure data in real time from pressure sensors installed at the inlet and outlet of the electric water filter. These pressure sensors accurately detect changes in inlet and outlet pressure, directly reflecting the degree of impurity buildup on the filter screen. The module's built-in algorithm calculates the real-time differential pressure between the filter's inlet and outlet and continuously compares this value with a preset differential pressure threshold. If the real-time differential pressure exceeds the set threshold, it indicates significant impurity buildup on the filter screen, affecting normal water flow and potentially leading to insufficient water supply pressure. The differential pressure control module immediately generates a differential pressure discharge signal and sends it to the PLC main control unit in real time. This differential pressure discharge signal accurately matches the actual clogging state of the filter screen, avoiding the inability of timed discharge to handle sudden blockages. It ensures that the discharge operation is more aligned with actual needs, guarantees stable water quality and flow, and enhances the system's ability to handle unexpected conditions.

[0029] 104. Receive timed discharge signals and differential pressure discharge signals through the PLC, and make discharge decisions based on the signal type and the current system status.

[0030] Specifically, the PLC main control unit receives both timed and differential pressure discharge signals in real time. It first clearly identifies the type of each signal, distinguishing between a timed, routine discharge request and a differential pressure-triggered, emergency discharge request. Then, it reads the current operating status through the system status monitoring module, including whether the system is in discharge mode, whether it is in a shutdown state, and whether there is any equipment malfunction. Combining the urgency of the signal type with the system status, it comprehensively determines whether to execute discharge, delay discharge, or postpone discharge. Making discharge decisions based on signal type and current system status avoids the PLC blindly responding to discharge signals; for example, it prevents the process from restarting repeatedly while the system is discharging, reducing equipment wear and water waste. Simultaneously, it prioritizes handling emergency situations corresponding to differential pressure signals, ensuring that blockages affecting system operation are addressed first, thus improving the rationality and safety of discharge control.

[0031] The specific decision-making process is as follows: The PLC first determines the validity of the two types of received signals. It continuously monitors whether the signal remains stable for a preset duration (e.g., maintaining a triggered state for 3 consecutive seconds), filtering out transient false signals caused by electromagnetic interference from the pressure sensor or contact jitter of the time relay. This operation avoids false signals triggering unnecessary sewage discharge, reducing water waste and mechanical wear on the sewage valve, and improving signal processing accuracy.

[0032] For valid signals that pass verification, the PLC automatically records two key pieces of information: the signal trigger time, such as "2024-10-01 15:20:08"; and the signal type, clearly marked as "timed discharge signal" or "differential pressure discharge signal". This information is then stored in the PLC's local database to provide data support for subsequent signal arbitration and frequency statistics, facilitating the tracing of the discharge trigger logic.

[0033] The PLC retrieves real-time data from the system status monitoring module and confirms three core states one by one: whether it is in a sewage discharge state by checking the sewage discharge status flag; whether it is in a unit shutdown state (when the unit is shut down, no water supply is needed, and sewage discharge is temporarily suspended); and whether it is in an equipment fault state, such as a stuck sewage discharge valve, interrupted sensor communication, or abnormal power supply. By clarifying whether the system meets the conditions for sewage discharge, forced sewage discharge under unsuitable conditions is avoided.

[0034] If multiple valid signals exist, such as a timing signal and a differential pressure signal received simultaneously, the PLC arbitrates according to preset rules: first, it calls the status priority matrix, which is configured during initialization, clearly indicating that the differential pressure discharge signal has a higher priority than the timing discharge signal, and thus responds first to the differential pressure signal. If multiple signals have the same priority, they are handled according to the first-in, first-out principle, comparing the signal trigger times; the signal that triggers first enters the execution queue first, while the signal that triggers later is temporarily stored. This resolves execution conflicts caused by multiple signals triggering simultaneously, ensuring that emergency discharge needs are responded to first, and preventing filter clogging from worsening and affecting water supply.

[0035] The PLC automatically calculates the trigger frequency of valid signals per unit time every hour, such as once for the timed signal and three times for the differential pressure signal per hour, and dynamically optimizes parameters based on the statistical results. If the differential pressure signal frequency is too high (e.g., >5 times per hour): it indicates that there are many impurities in the water or that the filter screen may be damaged. The PLC automatically shortens the timed drainage cycle and lowers the differential pressure threshold to allow the water filter to drain earlier. If the differential pressure signal frequency is too low (e.g., <1 time every 2 hours): it indicates that the water quality is clean. The PLC extends the timed cycle, increases the differential pressure threshold, and reduces ineffective drainage. If the frequency suddenly increases or decreases, the PLC immediately starts the system self-check program to check for problems such as pressure sensor inaccuracy, water filter damage, and sudden increase in impurities in the inlet pipe. The self-check results are pushed to the control room terminal to detect potential equipment problems in advance.

[0036] Based on signal validity, system status, and arbitration result, the PLC generates three types of instructions: Immediate Execution: If the valid signal is of high priority and the system is in a normal, non-discharge state, an immediate discharge start instruction is generated. Delayed Execution: If the valid signal is of low priority, but the system is discharging or experiencing a short pause, a delayed execution instruction is generated, and the signal is added to the waiting queue. Ignore Signal: If the valid signal is a duplicate signal or the system is in a fault state, an ignore signal instruction is generated, and the reason for the ignore is recorded for later log retrieval.

[0037] 105. The sewage discharge process is initiated by the PLC when any sewage discharge signal is triggered and the system is in a non-sewage discharge state.

[0038] Specifically, after making the above decisions, if the PLC confirms that any valid discharge signal has been triggered, and determines through the system status flag that the system is not currently in a discharge state, it immediately sends an opening command to the discharge valve actuator of the electric water filter to initiate the discharge process. After the discharge valve opens, the impurities accumulated in the water filter are discharged with the water flow. At the same time, the PLC updates the system status flag to clearly indicate that it is currently in a discharge state, preventing other discharge signals from triggering repeatedly. If the system is currently in a discharge state, the current discharge request is temporarily stored in a waiting queue and processed according to priority after the current discharge process is completed. If the command is to be executed immediately, the PLC sends an opening command to the discharge valve actuator and sets the "discharge status flag" to "1," continuously monitoring the discharge valve feedback signal. If no "open in place" signal is received within 3 seconds, it is determined that the discharge valve is stuck, triggering an alarm.

[0039] If the instruction is "delayed execution", the PLC will add the sewage discharge request to the waiting queue. Once the system exits the sewage discharge state, the flag will be reset to "0", and the PLC will automatically retrieve the signal from the head of the queue to execute the sewage discharge.

[0040] If the instruction is "ignore signal", the PLC will discard the signal directly and record the reason for discarding in the system log.

[0041] After the sewage discharge is completed and the differential pressure returns to normal and the sewage discharge time reaches the target, the PLC sends a sewage discharge valve closing command. After confirming the closure, the flag bit is reset to "0", and the sewage discharge data is recorded.

[0042] To ensure the orderly operation of the sewage discharge process and avoid excessive water consumption caused by multiple sewage discharges at the same time, it is also necessary to ensure that sewage discharge is carried out in a timely manner when needed, and to prevent problems such as increased filter clogging leading to decreased water supply pressure and insufficient unit cooling, thereby ensuring the continuous and stable operation of the hydropower station's technical water supply system.

[0043] 106. Monitor the status of the drain valve and the change in differential pressure during the sewage discharge process using a PLC, and trigger an abnormal alarm if the differential pressure does not return to the normal range within a set time.

[0044] Specifically, after the sewage discharge process is started, the PLC continuously monitors the on / off status of the sewage discharge valve through its status sensor, and simultaneously receives real-time pressure difference data of the water filter inlet and outlet transmitted by the pressure sensor, observing whether the pressure difference gradually decreases during the sewage discharge process. If the pressure difference does not return to the normal range after the sewage discharge has continued for a preset time, it indicates that the filter screen is severely clogged, the sewage discharge valve is not effectively discharging sewage, or the sewage discharge valve is detected to be stuck or unable to operate normally. The PLC immediately sends an abnormal alarm signal to the alarm device. After receiving the signal, the alarm device reminds the staff to handle the situation in a timely manner through audible and visual prompts or remote notifications. At the same time, the PLC automatically records the fault information to facilitate subsequent fault investigation and analysis.

[0045] By monitoring the sewage discharge effect and equipment status in real time, sewage discharge failure or equipment malfunction can be detected in a timely manner, avoiding problems such as abnormal water supply system pressure and insufficient unit cooling caused by incomplete sewage discharge, thus ensuring the safety of system operation. At the same time, rapid alarm response can reduce the scope of the fault impact.

[0046] Furthermore, based on the above embodiments, this embodiment also includes: monitoring the cumulative operating time of the water filter through PLC, and generating a maintenance reminder signal when the preset maintenance cycle is reached; based on the maintenance reminder signal, automatically switching to the standby water filter operation through PLC; and controlling the faulty water filter to enter the isolation and maintenance state through PLC according to the switching result.

[0047] Specifically, the PLC uses a built-in timing module to accumulate the running time of each electric water filter in real time and compares it with the preset maintenance cycle. When the accumulated time reaches the target, the PLC generates a maintenance reminder signal and simultaneously initiates a standby switch: closing the inlet and outlet valves of the current water filter and opening the standby water filter in the same unit to ensure uninterrupted water supply; after the standby water filter is running normally, the PLC controls the water filter to be maintained to drain residual water and marks it as "isolated for maintenance" to prevent accidental activation. Through intelligent maintenance, continuous water supply is ensured and maintenance risks are reduced.

[0048] Furthermore, this embodiment also includes: establishing a hierarchical alarm mechanism through the PLC, including early warning, alarm and emergency alarm; based on the hierarchical alarm mechanism, triggering alarms of the corresponding level through the PLC according to the severity of the fault; and executing corresponding handling measures through the PLC according to the alarm level, including automatic downgrade operation, switching to backup equipment or emergency shutdown.

[0049] Specifically, a tiered alarm mechanism (early warning, alarm, and emergency alarm) is configured during PLC initialization. Early warnings, such as differential pressure approaching the threshold or abnormal frequency, only involve text prompts on the terminal, without triggering audible or visual alarms. Alarms, such as slow action of the drain valve or high differential pressure after a single drain discharge, trigger medium-frequency audible and visual alarms plus push notifications from mobile terminals. Emergency alarms, such as a stuck drain valve, persistently excessive differential pressure, or communication / power failure, trigger high-frequency audible and visual alarms plus unit shutdown warnings.

[0050] When an anomaly is detected, the PLC matches the alarm level and triggers it, simultaneously executing corresponding measures. During a warning, the water supply flow is reduced to decrease the filter load; during an alarm, backup equipment is switched on; during an emergency alarm, the faulty filter is shut down; and if necessary, a unit shutdown warning is triggered. This system avoids excessive alarms, ensures rapid response to serious faults, and reduces system risk.

[0051] Furthermore, this embodiment also includes: monitoring the operating status of the tailwater cooler through a PLC to obtain cooling efficiency parameters; determining whether the cooler has scale buildup or blockage based on the cooling efficiency parameters through the PLC; and adjusting the sewage discharge frequency or starting the backwashing program through the PLC according to the determination result.

[0052] Specifically, the PLC collects inlet and outlet water temperature and flow data from the temperature and flow sensors of the tailwater cooler, calculates cooling efficiency parameters, and compares these parameters with normal ranges to determine if scaling / clogging exists. For minor scaling / clogging: shorten the filter's timed blowdown cycle and increase the blowdown frequency. For moderate scaling / clogging: further increase the sensitivity of the differential pressure blowdown threshold. For severe scaling / clogging: initiate the backwashing program, close the cooler's inlet and outlet valves, open the backwash valve and blowdown valve, reverse the flow of water to clear blockages, and simultaneously backwash the filter. After backwashing, monitor efficiency; if it returns to normal, switch back to regular water supply. By linking the filter and cooler, the cooling effect of the water supply system is ensured, preventing equipment overheating and damage.

[0053] Figure 2 is a schematic diagram of the PLC-based electric water filter sewage control system provided in this embodiment.

[0054] As shown in Figure 2, this embodiment provides a PLC-based electric water filter sewage discharge control system, including: a synchronization module 201, used to initialize the PLC system and synchronously start the timing control module and the differential pressure control module; a generation module 202, used to generate a timing sewage discharge signal according to an adjustable timing period through the timing control module; and to collect the inlet and outlet pressure difference of the water filter in real time through the differential pressure control module, and generate a differential pressure sewage discharge signal when the inlet and outlet pressure difference exceeds a set threshold; a decision module 203, used to receive the timing sewage discharge signal and the differential pressure sewage discharge signal through the PLC, and make a sewage discharge decision based on the signal type and the current system state; a sewage discharge module 204, used to start the sewage discharge process through the PLC when any sewage discharge signal is triggered and the system is in a non-sewage discharge state; and an alarm module 205, used to monitor the sewage discharge valve status and differential pressure changes through the PLC during the sewage discharge process, and trigger an abnormal alarm when the differential pressure does not return to the normal range within a set time.

[0055] Figure 3 is a schematic diagram of the structure of the electronic device provided in this embodiment.

[0056] As shown in Figure 3, the electronic device may include a processor 301, a communication interface 302, a memory 303, and a communication bus 304. The processor 301, communication interface 302, and memory 303 communicate with each other via the communication bus 304. The processor 301 can call logic instructions from the memory 303 to execute a PLC-based electric water filter wastewater control method.

[0057] Furthermore, the logical instructions in the aforementioned memory 303 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0058] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the PLC-based electric water filter sewage control method provided by the above methods.

[0059] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the PLC-based electric water filter sewage control method provided by the above methods.

[0060] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0061] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A PLC-based method for controlling the wastewater discharge of an electric water filter, characterized in that, include: The PLC is initialized, and the timing control module and differential pressure control module are started simultaneously. The timing control module generates a timed discharge signal according to an adjustable timing period. The differential pressure control module collects the inlet and outlet pressure difference of the water filter in real time and generates a differential pressure discharge signal when the inlet and outlet pressure difference exceeds a set threshold. The PLC receives the timed discharge signal and the differential pressure discharge signal and makes a discharge decision based on the signal type and the current system state. The PLC initiates the discharge process when any discharge signal is triggered and the system is in a non-discharge state. The PLC monitors the status of the drain valve and the change in differential pressure during the sewage discharge process, and triggers an abnormal alarm if the differential pressure does not return to the normal range within a set time.

2. The PLC-based electric water filter sewage discharge control method according to claim 1, characterized in that, The process of making a sewage discharge decision based on signal type and current system status includes: verifying the validity of received timed sewage discharge signals and differential pressure sewage discharge signals through a PLC, and excluding instantaneous signals whose duration has not reached the stability requirement; based on the result of the validity verification, determining through the PLC whether the system is currently in a sewage discharge state, a shutdown state, or a fault state; and generating corresponding control instructions through the PLC based on the result of the system status determination, including immediate execution, delayed execution, or ignoring the signal.

3. The PLC-based electric water filter sewage discharge control method according to claim 2, characterized in that, The step of generating corresponding control instructions via PLC includes: establishing a state priority matrix via PLC, wherein the differential pressure exceeding the standard signal has a higher priority than the timed trigger signal; based on the state priority matrix, performing signal arbitration via PLC when multiple discharge signals are received; and, according to the result of the signal arbitration, selecting to execute immediate discharge, queue waiting, or cancel duplicate requests via PLC.

4. The PLC-based electric water filter sewage discharge control method according to claim 3, characterized in that, The method of arbitrating signals when multiple sewage discharge signals are received by the PLC includes: recording the trigger time and signal type of each sewage discharge signal by the PLC; comparing the priorities of simultaneously arriving signals by the PLC based on the recorded signal information; and processing signals of the same priority according to the first-in-first-out principle by the PLC based on the result of the priority comparison.

5. The PLC-based electric water filter sewage discharge control method according to claim 4, characterized in that, After recording the trigger time and signal type of each sewage discharge signal by the PLC, the method further includes: based on the recorded signal information, using the PLC to count the trigger frequency of each type of signal per unit time; based on the trigger frequency statistics, using the PLC to dynamically adjust the length of the timing cycle and the size of the differential pressure threshold; based on the results of the dynamic adjustment, using the PLC to start the system self-test program when the frequency is abnormal, and to check for potential faults.

6. The PLC-based electric water filter sewage discharge control method according to claim 3, characterized in that, The step of selecting to execute immediate sewage discharge, queue waiting, or cancel duplicate requests via PLC based on the result of the signal arbitration includes: determining whether the result of the signal arbitration is an immediate sewage discharge command via PLC; if it is an immediate sewage discharge command, starting the sewage discharge valve via PLC and setting a sewage discharge status flag; monitoring the completion of the sewage discharge process via PLC based on the sewage discharge status flag, and resetting the flag after sewage discharge is completed; if the determination result is a queue waiting command via PLC, adding the current request to the waiting queue and processing it in sequence; if the signal arbitration result is cancel duplicate requests, discarding the current signal via PLC and recording the reason for discarding.

7. The PLC-based electric water filter sewage discharge control method according to claim 1, characterized in that, Also includes: The PLC monitors the cumulative operating time of the water filter and generates a maintenance reminder signal when the preset maintenance cycle is reached. Based on the maintenance reminder signal, the PLC automatically switches to the standby water filter operation; according to the switching result, the PLC controls the faulty water filter to enter the isolation and maintenance state.

8. The PLC-based electric water filter sewage discharge control method according to claim 1, characterized in that, Also includes: A tiered alarm mechanism is established using a PLC, including early warning, alarm, and emergency alarm. Based on this mechanism, the PLC triggers alarms of the corresponding level according to the severity of the fault. Depending on the alarm level, the PLC executes corresponding handling measures, including automatic downgrade operation, switching to backup equipment, or emergency shutdown.

9. The PLC-based electric water filter sewage discharge control method according to claim 1, characterized in that, Also includes: The operating status of the tailwater cooler is monitored by PLC to obtain cooling efficiency parameters; Based on the cooling efficiency parameters, the PLC determines whether the cooler has scale buildup or blockage; according to the determination result, the PLC adjusts the draining frequency or starts the backwashing program.

10. A PLC-based power filter wastewater discharge control system, characterized in that, include: The synchronization module is used to initialize the PLC system and synchronously start the timing control module and the differential pressure control module. The generation module is used to generate a timed discharge signal according to an adjustable time period through the timed control module; the differential pressure control module collects the pressure difference between the inlet and outlet of the water filter in real time, and generates a differential pressure discharge signal when the pressure difference exceeds a set threshold; the decision module is used to receive the timed discharge signal and the differential pressure discharge signal through the PLC, and make a discharge decision based on the signal type and the current system state; the discharge module is used to start the discharge process through the PLC when any discharge signal is triggered and the system is in a non-discharge state; the alarm module is used to monitor the status of the discharge valve and the pressure difference change through the PLC during the discharge process, and trigger an abnormal alarm when the pressure difference does not return to the normal range within a set time.

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