Intelligent medicament adding system of independent-control ad hoc network

Abstract

The invention relates to a single-control ad hoc network intelligent medicament adding system, the system comprises an intelligent metering valve, the intelligent metering valve comprises an intelligent metering valve flow control module, the intelligent metering valve flow control module is connected with a flow meter arranged on an operation pipeline, the intelligent metering valve flow control module selects STM32F103ZET6 as a main control core, and the intelligent metering valve flow control module is connected with the flow meter arranged on the operation pipeline; the flowmeter transmits a flow signal to the single-chip microcomputer through an RS485 communication protocol, and the alternating current motor driving module is mainly composed of an optocoupler and a thyristor. And the potentiometer and the limit switch are mechanically matched with the alternating-current motor to respectively output a motor rotation position and whether the motor rotates to a limit position. According to the invention, 90% of cable and power supply construction and laying cost of a project can be saved, 30% of control cabinet cost can be saved, the complexity of an agent adding system is greatly simplified, and the overall cost of the agent adding system is saved.

Description

Technical Field

[0001] This invention relates to the field of intelligent drug dosing technology, and in particular to an intelligent drug dosing system with a self-organizing network. Background Technology

[0002] Chemical dosing equipment plays an indispensable role in all process industries, including water treatment, chemical engineering, power generation, pharmaceuticals, metallurgy, and environmental protection. Large-scale process industries utilize a wide variety of chemical dosing equipment. Currently, chemical dosing equipment can be broadly categorized into two types: traditional metering pumps and a newer category—precision flow control systems combining pumps and valves. The latter, centered on precision, wide-range flow regulating valves, surpasses traditional metering pumps due to its comprehensive advantages in various aspects. With the advancement of industrial automation, both types of chemical dosing equipment have achieved automation. They generally employ analog input and output modes for the transmission of primary signals, while auxiliary parts use digital signal transmission, meeting the current basic requirements of automation.

[0003] However, as industrial automation develops towards advanced intelligence, systematization, and networking, these basic and traditional equipment information transmission methods and control approaches face significant shortcomings. For example, a flow meter using traditional methods can only transmit flow information, while the flow meter itself contains a variety of advanced information, such as flow meter empty pipe, flow meter malfunction, and upper and lower limit alarms. This advanced equipment information can only be transmitted through communication. Similarly, for a water pump motor's frequency converter, current methods generally only record the converter's control and feedback frequencies using analog signals. However, frequency converters possess a wealth of equipment information, such as motor current detection, motor overload, overcurrent, overtemperature, undervoltage, and dozens of other related data, meeting the information needs of advanced control systems. Therefore, the transition of industrial automation from its initial stage to advanced intelligent and systematized systems is an inevitable process. This process requires a large number of detection and control parameters, posing new challenges to industrial automation.

[0004] A chemical dosing system typically consists of multiple control modules, such as dosing equipment, flow detection equipment, flow control module, display and human-machine interface module, lightning protection module, and isolation module. The system functions are distributed and fragmented, requiring the collection of all kinds of data and information to form an important part of the system.

[0005] Cable laying is also extremely costly in construction projects. Each set of chemical dosing equipment and accessories (metering pumps or electronic regulating valves, and flow meters) requires various power cables to power the equipment, as well as a large number of signal cables to transmit information. A medium-sized chemical dosing system typically requires over a hundred cables of various types for the power supply of the dosing equipment (including single-phase and three-phase power), as well as for the acquisition and transmission of various information data. Large industrial chemical dosing systems require even more data and power cables. Cables bring a huge amount of civil construction work, including cable laying, cable tray installation, and wiring. After the cables are connected, the wires must be checked for identification, and analog signals need to be verified and validated using signal generators. When the cables enter the control cabinet, numerous modules are needed for signal acquisition and output, especially for analog signals, which also require isolation and lightning protection design. The overall module and hardware costs are also very high. Summary of the Invention

[0006] In view of the above problems, the present invention provides an intelligent chemical dosing system with independent control and self-organizing network, which can not only save 90% of the construction and laying costs of cables and power supply, and 30% of the control cabinet costs, but also greatly simplify the complexity of the chemical dosing system and save the overall cost of the chemical dosing system.

[0007] To achieve the above and other related objectives, the present invention provides the following technical solution: A smart reagent dosing system with independent control and self-organizing network, the system comprising: The intelligent metering valve includes an intelligent metering valve flow control module, which is connected to a flow meter installed on the operating pipeline. The intelligent metering valve flow control module uses an STM32F103ZET6 as the main control core. The flow meter transmits the flow signal to the microcontroller via RS485 communication protocol. The AC motor drive module mainly consists of optocouplers and thyristors. Potentiometers and limit switches mechanically cooperate with the AC motor to output the motor rotation position and whether the motor has rotated to the limit position, respectively. The AC current and temperature detection modules output the AC motor operating current and the real-time temperature signal of the thyristor, respectively. User operation via a TFT screen, buttons, and a Bluetooth-connected mobile app or host computer allows users to control the AC motor to work and output data information on the target flow rate of the reagent to be added, given the target opening degree or target flow rate of the valve.

[0008] Furthermore, the hardware circuit of the intelligent metering valve is divided into four modules: upper layer, middle layer, lower layer, and button. The drive circuit of the AC motor is a bidirectional thyristor drive optocoupler with a composite switch, using an MOC3083. The input side requires a 4-5mA positive operating current. A microcontroller-controlled transistor drive circuit is selected to turn on the LED in the optocoupler chip. When the LED light intensity is low, the optocoupler output side is not conducting, and the motor does not work. When the LED light intensity is high enough, the output side conducts. When the optocoupler output side is conducting, when the AC power supply is in the positive half-wave, the cathode potential of Q2 is higher than the anode potential, so Q2 is off. The anode potential of Q3 is higher than the cathode potential, and the control electrode has a positive voltage and current, so Q3 conducts and remains on. Similarly, when the AC power supply is in the negative half-wave, Q2 conducts and remains on, and Q3 is off. When the upper half-wave is conducting, the motor rotates forward; when the lower half-wave is conducting, the motor rotates in reverse. The thyristor selected is the S8025L, which is 25A. 800V insulated unidirectional thyristor.

[0009] Furthermore, the AC current and temperature detection module uses an ACS758 as the current detection chip. The chip is a linear Hall element. The current sampling stage of the element is connected in series in the circuit under test to generate a magnetic field and convert it into a voltage signal. The internal resistance of the current sampling stage of the ACS758 is 100μΩ. C3 is a power supply filter circuit, and C2 and R3 form an RC low-pass filter circuit. The thyristor circuit uses a TMP37. The communication circuit of the flow meter uses a MAX3485 as a TTL to 485 transceiver chip, and pull-up and pull-down resistors are added to match the impedance of the flow meter. The microcontroller requests flow meter data through the RS485 protocol and adjusts the flow rate through PID cascade control.

[0010] Furthermore, the frequency converter is connected to a three-phase power supply and then to a water pump motor via a three-phase cable. The frequency converter is connected to a serial server via RS485.

[0011] Furthermore, the intelligent metering valve and the flow meter are connected via a communication method, such as RS485 or other communication methods. The flow meter sends all equipment operating information and conditions to the intelligent metering valve, and the relevant settings of the flow meter are also completed within the intelligent metering valve. The two form a primary and secondary functional module, with the flow meter being an internal module of the subordinate intelligent metering valve.

[0012] Furthermore, the frequency converter of the water pump motor communicates with the serial port server via RS485. The serial port server is converted to Ethernet communication and connected to the upper control module through a switch to upload the relevant equipment operation information of the frequency converter. At the same time, the operating frequency of the water pump motor is dynamically adjusted according to the information sent back by the intelligent metering valve to ensure the precision of the system flow control.

[0013] Furthermore, the pump-valve combination drug dosing system consists of two main parts: an intelligent precision control system for drug dosing with an intelligent regulating valve as its core, and an auxiliary power supply control circuit. In drug dosing equipment that uses a centrifugal pump for coarse flow adjustment and an electronic regulating valve for fine flow adjustment, a specially designed intelligent metering valve replaces the original electronic regulating valve. The control function of the original external flow control unit is embedded into the intelligent metering valve with an intelligent flow control module. The intelligent metering valve circuit includes the original electromechanical mechanism and valve control circuit, and adds flow control software, a keyboard display human-machine dialogue operation circuit, and a circuit for interface with an external flow meter.

[0014] Furthermore, the intelligent metering valve possesses the functions of a conventional flow control software module, such as flow control setting, real-time flow display, manual and automatic valve operation, valve opening detection, and control methods. It is linked to the flow meter via RS485 communication. All information from the flow meter is transmitted through the intelligent metering valve. The intelligent metering valve receives the flow detection signal, compares it with the internally stored setting signal, and coordinates with the valve control software developed specifically for the valve to control the valve action and change the flow rate. This flow rate is fed back to the intelligent metering valve, performing a continuous closed-loop feedback control. In this system, the flow meter becomes an auxiliary module of the intelligent metering valve, and the two communicate to form an intelligent flow control module.

[0015] Furthermore, the intelligent metering valve and the upper control module also communicate via a communication method. The RS485 of the intelligent metering valve is converted to Ethernet communication via a serial port server and connected to the upper control module.

[0016] Furthermore, the RS485 interface of the frequency converter is converted to Ethernet communication through a serial port server, enabling remote frequency conversion control of the water pump motor. In addition, a large amount of equipment information and alarm information of the water pump motor can be exchanged with the upper control module through communication.

[0017] The present invention has the following positive effects: 1. This invention obtains much information from chemical dosing equipment that cannot be obtained through analog transmission by employing communication methods, providing a wealth of relevant information for advanced information-based and systematic control of the system. Its communication-based approach can save 90% of the construction and laying costs for cables and power supply, and 30% of the control cabinet cost, representing a significant innovation in chemical dosing equipment.

[0018] 2. This invention utilizes an intelligent metering valve in a pump-valve combined reagent dosing system to achieve Ethernet communication via RS485 to RJ45 conversion. The frequency converter uses the same method. The two Ethernet interfaces of the intelligent metering valve (embedded flow meter) and the frequency converter are combined into one via a switch and linked to the control cabinet or upper-level control system. The entire reagent dosing system can be controlled via a single network cable for data transmission and control between the upper and lower systems, greatly simplifying the complexity of the reagent dosing system and saving overall costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the frame of the intelligent metering valve of the present invention; Figure 2 This is a schematic diagram of the hardware framework of the intelligent metering valve of the present invention; Figure 3 This is a schematic diagram of the AC motor drive circuit of the present invention; Figure 4 This is a schematic diagram of the AC current detection and thyristor temperature detection circuit of the present invention; Figure 5 This is a schematic diagram of the host computer communication circuit of the present invention; Figure 6 This is a schematic diagram of the communication circuit of the flow meter of the present invention; Figure 7 This is a schematic diagram of the working process of the intelligent metering valve of the present invention; Figure 8 This is a system structure diagram of the flow control mode of the present invention; Figure 9 This is a schematic diagram of the display interface structure of the intelligent metering valve of the present invention. Detailed Implementation

[0020] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0021] Example 1: As Figure 1 As shown, an intelligent reagent dosing system with a self-organizing network is disclosed, the system comprising: The intelligent metering valve includes an intelligent metering valve flow control module, which is connected to a flow meter installed on the operating pipeline. The intelligent metering valve flow control module uses an STM32F103ZET6 as the main control core. The flow meter transmits the flow signal to the microcontroller via RS485 communication protocol. The AC motor drive module mainly consists of optocouplers and thyristors. Potentiometers and limit switches mechanically cooperate with the AC motor to output the motor rotation position and whether the motor has rotated to the limit position, respectively. The AC current and temperature detection modules output the AC motor operating current and the real-time temperature signal of the thyristor, respectively. User operation via a TFT screen, buttons, and a Bluetooth-connected mobile app or host computer allows users to control the AC motor to work and output data information on the target flow rate of the reagent to be added, given the target opening degree or target flow rate of the valve.

[0022] In this embodiment, the hardware circuit of the intelligent metering valve is divided into four modules: upper layer, middle layer, lower layer, and button. The drive circuit of the AC motor is a bidirectional thyristor drive optocoupler with a composite switch, using an MOC3083. The input side requires a 4-5mA positive operating current. A microcontroller-controlled transistor drive circuit is selected to turn on the LED in the optocoupler chip. When the LED light intensity is low, the optocoupler output side is not conducting, and the motor does not work. When the LED light intensity is high enough, the output side conducts. When the optocoupler output side is conducting, during the positive half-wave of the AC power supply, the cathode potential of Q2 is higher than the anode potential, so Q2 is off. The anode potential of Q3 is higher than the cathode potential, and the control electrode has a positive voltage and current, so Q3 conducts and remains on. Similarly, during the negative half-wave of the AC power supply, Q2 conducts and remains on, while Q3 is off. When the upper half-wave is conducting, the motor rotates forward; when the lower half-wave is conducting, the motor rotates in reverse. The thyristor selected is an S8025L, which is 25A. 800V insulated unidirectional thyristor.

[0023] In this embodiment, the AC current and temperature detection module uses an ACS758 as the current detection chip. The chip is a linear Hall element. The current sampling stage of the element is connected in series in the circuit under test to generate a magnetic field and convert it into a voltage signal. The internal resistance of the current sampling stage of the ACS758 is 100μΩ. C3 is a power supply filter circuit, and C2 and R3 form an RC low-pass filter circuit. The thyristor circuit uses a TMP37. The communication circuit of the flow meter uses a MAX3485 as a TTL to 485 transceiver chip, and pull-up and pull-down resistors are added to match the impedance of the flow meter. The microcontroller requests flow meter data through the RS485 protocol and adjusts the flow rate through PID cascade control.

[0024] In this embodiment, the frequency converter is connected to a three-phase power supply and then to a water pump motor via a three-phase cable. The frequency converter is connected to a serial server via RS485.

[0025] In this embodiment, the smart metering valve and the flow meter are connected via communication, which can be RS485 or other communication methods. The flow meter sends all equipment operating information and conditions to the smart metering valve, and the relevant settings of the flow meter are also completed within the smart metering valve. The two form a primary and secondary functional module, with the flow meter being an internal module of the subordinate smart metering valve.

[0026] In this embodiment, the frequency converter of the water pump motor communicates with the serial port server via RS485. The serial port server is converted to Ethernet communication and connected to the upper control module through a switch to upload the relevant equipment operation information of the frequency converter. At the same time, the operating frequency of the water pump motor is dynamically adjusted according to the information sent back by the intelligent metering valve to ensure the precision of the system flow control.

[0027] In this embodiment, the pump-valve combination drug dosing system consists of two main parts: an intelligent precision control system for drug dosing with an intelligent regulating valve as its core, and an auxiliary power supply control circuit. In the drug dosing equipment that uses a centrifugal pump for coarse flow adjustment and an electronic regulating valve for fine flow adjustment, a specially designed intelligent metering valve replaces the original electronic regulating valve. The control function of the original external flow control unit is embedded into the intelligent metering valve with an intelligent flow control module. The intelligent metering valve circuit includes the original electromechanical mechanism and valve control circuit, and adds flow control software, a keyboard display human-machine dialogue operation circuit, and a circuit for interface with an external flow meter.

[0028] In this embodiment, the intelligent metering valve possesses the functions of a conventional flow control software module, such as flow control setting, real-time flow display, manual and automatic valve operation, valve opening detection, and control. It is linked to the flow meter via RS485 communication. All information from the flow meter is transmitted through the intelligent metering valve. The intelligent metering valve receives the flow detection signal, compares it with the internally stored setting signal, and coordinates with the valve control software developed specifically for the valve to control the valve action, thereby changing the flow rate. This flow rate is fed back to the intelligent metering valve, performing a continuous closed-loop feedback control. In this system, the flow meter becomes an auxiliary module of the intelligent metering valve, and the two communicate to form an intelligent flow control module.

[0029] In this embodiment, the intelligent metering valve and the upper control module also communicate via a communication method. The RS485 of the intelligent metering valve is converted to Ethernet communication via a serial port server and connected to the upper control module.

[0030] In this embodiment, the RS485 interface of the frequency converter is converted to Ethernet communication through a serial port server. Remote frequency conversion control of the water pump motor is completed through communication. In addition, a large amount of equipment information and alarm information of the water pump motor can be exchanged with the upper control module through communication.

[0031] Example 2: Based on the intelligent drug dosing system with independent self-organizing network in Example 1, the present invention will be further described and explained below.

[0032] like Figure 1 As shown, the intelligent metering valve includes an intelligent metering valve flow control module, which is connected to a flow meter installed on the operating pipeline. The intelligent metering valve flow control module uses an STM32F103ZET6 as the main control core. The flow meter transmits the flow signal to the microcontroller via the RS485 communication protocol. The AC motor drive module mainly consists of an optocoupler and a thyristor. The potentiometer and limit switch work mechanically with the AC motor to output the motor rotation position and whether the motor has rotated to the limit position, respectively. The AC current and temperature detection modules output the AC motor operating current and the real-time temperature signal of the thyristor, respectively. User operation via a TFT screen, buttons, and a Bluetooth-connected mobile app or host computer allows the valve to be operated to a target opening degree or target flow rate, controlling the AC motor and outputting data information on the target flow rate of the reagent to be added.

[0033] In this embodiment, as Figure 4 As shown, the intelligent metering valve uses an STM32F103ZET6 as its main control core. The flow meter transmits the flow signal to the microcontroller via the RS485 communication protocol. The AC motor drive module mainly consists of an optocoupler and a thyristor. The potentiometer and limit switch work mechanically with the AC motor to output the motor's rotation position and whether the motor has reached its limit position, respectively. The current and temperature detection modules output the AC motor's operating current and the thyristor's real-time temperature signal, respectively. User operation via a TFT screen, buttons, and a Bluetooth-connected mobile app or host computer allows the valve to be operated to a target opening degree or target flow rate, thereby controlling the AC motor to stabilize the valve opening degree or flow rate.

[0034] In this embodiment, as Figure 2 As shown, the intelligent metering valve is powered by 220V AC power. The AC motor is primarily driven by 220V AC power, while other modules are powered by a 220V to 5V switching power supply and a 5V to 3.3V linear regulator chip. The intelligent metering valve hardware circuit is divided into four modules: upper layer, middle layer, lower layer, and buttons. The AC motor drive circuit is shown below. Figure 3As shown. The MOC3083 is a bidirectional thyristor-driven optocoupler with a composite switch. It requires a 5mA forward operating current on the input side, so a microcontroller-controlled transistor driver circuit is used to turn on the LED in the optocoupler chip. When the LED intensity is low, the optocoupler output side is not conducting, and the motor does not work; when the LED intensity is high enough, the output side conducts. Figure 6 Taking the upper part as an example, when the optocoupler output side is on, during the positive half-wave of the AC power supply, the cathode potential of Q2 is higher than the anode potential, so Q2 is off. The anode potential of Q3 is higher than the cathode potential, and the control electrode has sufficient positive voltage and current, so Q3 is on and remains on. Similarly, when the AC power supply is in the negative half-wave, Q2 is on and remains on, while Q3 is off. This circuit can achieve AC power supply conduction in both positive and negative half-waves. Figure 6 The lower half of the circuit works similarly. When the upper half is conducting, the motor rotates forward; when the lower half is conducting, the motor rotates in reverse. The thyristor selected is the S8025L, a 25A 800V insulated unidirectional silicon controlled rectifier (SCR), ensuring the safety of the intelligent metering valve operation.

[0035] In this embodiment, the AC current detection and thyristor temperature detection circuit is as follows: Figure 4 As shown. The ACS758 is selected as the current sensing chip. This chip is a linear Hall element. The current sampling stage of the element is connected in series in the circuit under test to generate a magnetic field, which is then converted into a voltage signal. The ACS758's current sampling stage has an internal resistance of 100μΩ, resulting in low power loss. C3 is the power supply filter circuit, and C2 and R3 form an RC low-pass filter circuit to optimize noise management. The thyristor temperature sensing circuit uses the TMP37, which is suitable for applications in the range of 5℃ to 100℃. It is particularly important to note that a 0.1μF filter capacitor needs to be added before connecting to the microcontroller to filter out high-frequency interference induced during the wiring process.

[0036] In this embodiment, RS485 has the advantages of long communication distance, strong anti-interference capability, and support for multiple nodes. Communication with the host computer and flow meter is completed through RS485. The host computer communication circuit is as follows: Figure 5 As shown, the flow meter communication circuit is as follows: Figure 6 As shown. The host computer communication circuit uses the MAX3157 as the TTL to 485 transceiver chip, which provides ±50V isolation and ensures operation at a rate of 250kbps. The flow meter communication circuit uses the MAX3485 as the TTL to 485 transceiver chip, with pull-up and pull-down resistors added to match the flow meter impedance. The circuit uses NPN transistors to form a self-transmitting circuit, and a bidirectional TVS diode is added to protect components from damage caused by electrostatic discharge, electrical fast transients, and lightning-induced surges.

[0037] like Figure 7As shown. The intelligent metering valve has two modes: opening control and flow control.

[0038] 1) Valve Opening Control: The microcontroller acquires the analog voltage signal from the potentiometer mechanically connected to the AC motor to determine the valve opening. If the opening adjustment precision is too high, the motor will frequently reverse, causing a sharp increase in backlash current and potentially burning out the thyristor. Therefore, it is necessary to set appropriate adjustment precision and a forward / reverse switching interval. The opening control process is as follows: When the given valve opening is outside the minimum error range compared to the actual valve opening, if the given valve opening is greater than the actual valve opening and the motor rotates forward within one second, the microcontroller controls the motor to reverse. If the given valve opening is less than the actual valve opening and the motor rotates backward within one second, the microcontroller controls the motor to rotate forward. In other cases, the microcontroller stops the motor.

[0039] 2) Flow Control: The microcontroller requests flow meter data via RS485 protocol and adjusts the flow rate through PID cascade control. The system architecture diagram for flow control mode is shown below. Figure 8 As shown.

[0040] The 2.1-inch IPS screen is driven by the ST7789V driver chip. The microcontroller issues commands to the ST7789V driver chip via the MCU8080 protocol, and the STM32 uses FSMC to simulate the 8080 timing to display the specified module on the screen. The intelligent metering valve display consists of five interfaces, such as... Figure 9 As shown.

[0041] 1) Main Interface: Displays the valve's operating status, the connection status of the flow meter, host computer, and Bluetooth, as well as the real-time flow rate and valve opening. In flow control mode, the given flow rate is set and displayed via buttons and the screen; in opening control mode, the given opening is set and displayed via buttons and the screen.

[0042] 2) Parameter adjustment: The parameter adjustment interface allows manual setting of PID, EP, EF, SF, ID, TW, and CW.

[0043] PID parameters: Factory default values ​​P: 20, I: 5, D: 0, resulting in relatively ideal adjustment. If the effect is not ideal in the field, the PID parameters can be manually modified. A. If the overshoot is too large before reaching steady state, and the requirement for reaching steady state time is not high, the proportional band can be increased to overcome the overshoot. B. If the time to reach steady state needs to be accelerated, and a small amount of overshoot is acceptable, the proportional band can be appropriately reduced. C. When the measured value fluctuates slowly around the setpoint, the integral time can be appropriately increased or the proportional band can be increased. D. When the measured value fluctuates frequently around the setpoint, the derivative time can be appropriately reduced.

[0044] EP, EF: Set the minimum tolerance error for valve control and flow control. Range: 0-1.0% and 0-3.0 L / h, no adjustment is required if the minimum tolerance error is within the set value. Adjustment principle: The DB width needs to be selected through on-site testing to achieve both improved control accuracy and energy saving.

[0045] SF: Adjusting the overshoot suppression coefficient can prevent overshoot (or undershoot) in the transient response of the controlled parameter. The principle is to advance the proportional control and delay the integral control (overcoming integral saturation). Theoretically, reaching the new setpoint with excessively rapid adjustment can easily cause oscillation. The overshoot suppression coefficient SF (0-1.0) can be specifically selected on-site based on the process time and allowable overshoot. SF=0 is for conventional PID; SF=1 has strong overshoot suppression but slow speed; SF=0.4 is the factory default value.

[0046] ID: Specifies the device serial number used for communication with the host computer.

[0047] TW, CW: Set the threshold values ​​for thyristor temperature and motor current, ranging from 60-100℃ and 0.5-2.0A respectively. Specific values ​​should be determined on-site.

[0048] 3) Limit adjustment: Specifies the position of the valve when it is fully open and fully closed, and the maximum and minimum values ​​of the flow rate setting.

[0049] 4) Mode selection: Switch between opening control and flow control modes.

[0050] This invention proposes a self-organizing network system using modern communication technology. It connects several key components of a pharmaceutical dosing system—intelligent metering valves (with built-in flow control software and interface circuits), flow meters, and centrifugal pumps—into an independently controlled network. A single network cable can connect the field devices to the upper-level control system for data transmission and control. The intelligent metering valve circuit design is innovative; it integrates the hardware and software of the flow control module (such as display and keyboard human-machine interface, flow control software, and interface for communication with external flow meters) into the valve itself, building upon the original valve electromechanical control.

[0051] This system also changes the original requirement of drawing power from the control cabinet of the control system to connecting the equipment locally, which greatly reduces the cost of laying power cables.

[0052] In this system, the intelligent metering valve is powered by a nearby single-phase power supply. It connects to the flow meter via RS485. The flow meter detects the flow rate of the agent passing through the pipeline and feeds back the detected flow rate to the intelligent metering valve. The valve then performs adaptive flow algorithm control, adjusting the valve opening to change the flow rate.

[0053] The intelligent metering valve is installed on-site, and an adaptive PID control algorithm is chosen to control the flow. The intelligent metering valve transmits all data from the valve and flow meter to a serial server via RS485, then converts it to Ethernet and switches, and finally connects to the upper-level control system via Ethernet, forming a networked closed-loop control system for data transmission between upper and lower level systems.

[0054] The centrifugal pump motor, serving as the power source for the chemical dosing system, also utilizes network communication control. The motor frequency converter, a key component of the power system, is connected to the motor via cable. Its power supply is a locally sourced three-phase power source, reducing the cost of laying power cables. The frequency converter communicates with a serial server via RS485 and then connects to a switch via Ethernet, bringing the system's power system under full network control.

[0055] By incorporating both the pesticide dosing equipment and the power supply system into an independently controlled network, this initiative embodies the national policies of digitalization, networking, and intelligentization, and innovatively proposes a new network-based pesticide dosing paradigm.

[0056] The flow of the intelligent control method for intelligent metering valves is as follows: The intelligent metering valve obtains real-time flow signals from the flow meter and transmits the collected signals to the intelligent metering valve flow control module. The intelligent metering valve flow control module performs data analysis, generates control strategies, and directs the valve control software to control valve actions. The flow meter feeds back the flow signal to the intelligent metering valve, and the flow control module of the intelligent metering valve forms a closed-loop control.

[0057] In summary, this invention not only saves 90% of the construction and laying costs of cables and power supply, and 30% of the control cabinet costs, but also greatly simplifies the complexity of the chemical dosing system and saves the overall cost of the chemical dosing system.

[0058] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A smart reagent dosing system with a self-organizing network, characterized in that, The system includes: The intelligent metering valve includes an intelligent metering valve flow control module, which is connected to a flow meter installed on the operating pipeline. The intelligent metering valve flow control module uses an STM32F103ZET6 as the main control core. The flow meter transmits the flow signal to the microcontroller via RS485 communication protocol. The AC motor drive module mainly consists of optocouplers and thyristors. Potentiometers and limit switches mechanically cooperate with the AC motor to output the motor rotation position and whether the motor has rotated to the limit position, respectively. The AC current and temperature detection modules output the AC motor operating current and the real-time temperature signal of the thyristor, respectively. User operation via a TFT screen, buttons, and a Bluetooth-connected mobile app or host computer allows users to control the AC motor to work and output data information on the target flow rate of the reagent to be added, given the target opening degree or target flow rate of the valve.

2. The intelligent reagent dosing system with independent self-organizing network according to claim 1, characterized in that, The hardware circuit of the intelligent metering valve is divided into four modules: upper layer, middle layer, lower layer, and button. The drive circuit of the AC motor is a bidirectional thyristor drive optocoupler with a composite switch, using an MOC3083. The input side requires a 4-5mA positive operating current. A microcontroller-controlled transistor drive circuit is selected to turn on the LED in the optocoupler chip. When the LED light intensity is low, the optocoupler output side is not conducting, and the motor does not work. When the LED light intensity is high enough, the output side conducts. When the optocoupler output side is conducting, during the positive half-wave of the AC power supply, the cathode potential of Q2 is higher than the anode potential, so Q2 is off. The anode potential of Q3 is higher than the cathode potential, and the control electrode has a positive voltage and current, so Q3 conducts and remains on. Similarly, during the negative half-wave of the AC power supply, Q2 conducts and remains on, while Q3 is off. When the upper half-wave is conducting, the motor rotates forward; when the lower half-wave is conducting, the motor rotates in reverse. The thyristor selected is the S8025L, which is 25A. 800V insulated unidirectional thyristor.

3. The intelligent reagent dosing system with independent self-organizing network according to claim 1, characterized in that: The AC current and temperature detection module uses an ACS758 as the current detection chip. The chip is a linear Hall element. The current sampling stage of the element is connected in series in the circuit under test to generate a magnetic field and convert it into a voltage signal. The internal resistance of the current sampling stage of the ACS758 is 100μΩ. C3 is a power supply filter circuit, and C2 and R3 form an RC low-pass filter circuit. The thyristor circuit uses a TMP37. The communication circuit of the flow meter uses a MAX3485 as a TTL to 485 transceiver chip, and pull-up and pull-down resistors are added to match the impedance of the flow meter. The microcontroller requests flow meter data through the RS485 protocol and adjusts the flow rate through PID cascade control.

4. The intelligent reagent dosing system with independent self-organizing network according to claim 1, characterized in that: The frequency converter is connected to a three-phase power supply and then to a water pump motor via a three-phase cable. The frequency converter is connected to a serial server via RS485.

5. The intelligent reagent dosing system with independent self-organizing network according to claim 1, characterized in that: The smart metering valve and the flow meter are connected via communication, which can be RS485 or other communication methods. The flow meter sends all equipment operating information and status to the smart metering valve. The relevant settings of the flow meter are also completed within the smart metering valve. The two form a primary and secondary functional module, with the flow meter being an internal module of the subordinate smart metering valve.

6. The intelligent reagent dosing system with independent self-organizing network according to claim 1, characterized in that: The frequency converter of the water pump motor communicates with the serial port server via RS485. The serial port server is converted to Ethernet communication and connected to the upper control module through a switch to upload the relevant equipment operation information of the frequency converter. At the same time, the operating frequency of the water pump motor is dynamically adjusted according to the information sent back by the intelligent metering valve to ensure the precision of the system flow control.

7. The intelligent reagent dosing system with independent self-organizing network according to claim 1, characterized in that: The pump-valve combination dosing system consists of two main parts: an intelligent precision control system for dosing, with an intelligent regulating valve at its core, and an auxiliary power supply control circuit. In dosing equipment that uses a centrifugal pump for coarse flow adjustment and an electronic regulating valve for fine flow adjustment, a specially designed intelligent metering valve replaces the original electronic regulating valve. The control function of the original external flow control unit is embedded into the intelligent metering valve with an intelligent flow control module. The intelligent metering valve circuit includes the original electromechanical mechanism and valve control circuit, and adds flow control software, a keyboard display human-machine dialogue operation circuit, and a circuit for interface with an external flow meter.

8. The intelligent reagent dosing system with independent self-organizing network according to claim 1, characterized in that: The intelligent metering valve possesses the functions of a conventional flow control software module, such as flow control setting, real-time flow display, manual and automatic valve operation, valve opening detection, and control methods. It is linked to the flow meter via RS485 communication. All information from the flow meter is transmitted through the intelligent metering valve. The intelligent metering valve receives the flow detection signal, compares it with the internally stored setting signal, and coordinates with the valve control software developed specifically for the valve to control the valve action and change the flow rate. This flow rate is fed back to the intelligent metering valve, performing a continuous closed-loop feedback control. In this system, the flow meter becomes an auxiliary module of the intelligent metering valve, and the two communicate to form an intelligent flow control module.

9. The intelligent reagent dosing system with independent self-organizing network according to claim 1, characterized in that: The intelligent metering valve also communicates with the upper control module. The RS485 of the intelligent metering valve is converted to Ethernet communication through a serial port server and connected to the upper control module.

10. The intelligent reagent dosing system with independent self-organizing network according to claim 1, characterized in that: The RS485 interface of the frequency converter is converted to Ethernet communication through a serial port server. Remote frequency conversion control of the water pump motor is achieved through communication, and the equipment information and alarm information of the water pump motor are also exchanged with the upper control module through communication.

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