A metering pump inlet redundant positive pressure control system and control method

Abstract

The present application relates to the field of refining metering pump delivery, and specifically discloses a metering pump inlet redundant positive pressure control system and control method, comprising: a medicament tank, a liquid level transmitter is arranged on the medicament tank, and a medicament outlet pipeline is arranged at the bottom of the medicament tank; a pressure buffering unit, comprising a collector, an inlet of the collector is connected with the end of the medicament outlet pipeline, a vacuum pressure detector is arranged on the collector, and a metering pump is communicated with the outlet pipeline of the collector; a negative pressure module, the negative pressure module is arranged in communication with the collector, and the redundant positive pressure is reduced by sucking the gas in the collector; and an electric control module is further included. The beneficial effect is that the device can maintain the pressure in the collector stable in the target range, improve the reliability, stability and precision of the medicament delivery of the metering pump operation, and adapt to the medicament metering and delivery requirements under different working conditions.

Description

Technical Field

[0001] This invention relates to the field of metering pump delivery, and specifically to a redundant positive pressure control system and control method for the inlet of a metering pump. Background Technology

[0002] As a core component of the dosing system, the metering pump is used to add chemicals to the process system, and its accuracy and lifespan are crucial. Dosing accuracy determines the effect after dosing and can maximize chemical conservation, while lifespan determines the metering pump's ability to operate continuously for extended periods.

[0003] Comparing with Chinese Patent CN104389776A, which discloses a differential pressure stabilizing device for the inlet of a metering pump, the differential pressure stabilizing device consists of a shell, a connecting pipe, and a valve body. The bottom of the shell is provided with a liquid inlet and a liquid outlet. The connecting pipe is located above the liquid inlet. One end of the connecting pipe is connected to a first pipeline, and the other end of the connecting pipe is connected to the valve body. The liquid outlet is connected to a second pipeline. The valve body consists of a valve seat, a valve core, a valve cover, a rocker handle, a pin, a rocker arm, and a float. The valve cover is located above the valve seat. A guide rod is provided at the upper end of the valve core. The guide rod extends out of the valve cover and can contact and cooperate with one end of the rocker handle located above the valve cover. A pin is provided on one side of the valve cover. The rocker handle is hinged to the pin. A rocker arm is connected to the other end of the rocker handle. A float is located at the end of the rocker arm.

[0004] In the structure of the above-mentioned device, the valve body is composed of a valve seat, valve core, valve cover, rocker handle, pin, rocker arm and float. That is, the valve body is a float valve in the existing structure. It makes full use of the mechanical linkage of the float valve core to control the flow. This structure has mechanical lag in use, is a passive adjustment, and cannot quickly respond to sudden changes in flow. In essence, it cannot solve the problem of accurate control and dynamic balance of the metering pump inlet pressure.

[0005] Therefore, a redundant positive pressure control system and control method for the metering pump inlet with active differential pressure adjustment is needed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a redundant positive pressure control system and control method for the inlet of a metering pump in order to solve the above-mentioned problems, as detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution: specifically comprising a reagent tank, a pressure buffer unit, and a negative pressure module; the reagent tank is equipped with a level transmitter, and a dispensing pipeline is provided at the bottom of the reagent tank; the pressure buffer unit includes a collector, the inlet of which is connected to the end of the dispensing pipeline, and a vacuum pressure detector is provided on the collector; the outlet pipeline of the collector is connected to a metering pump; the negative pressure module is connected to the collector and reduces redundant positive pressure by absorbing gas in the collector; and further comprising an electronic control module, wherein the level transmitter, the vacuum pressure detector, and the negative pressure module are all electrically connected to the electronic control module, and the electronic control module controls the negative pressure module based on the signals from the level transmitter and the vacuum pressure detector to maintain the detected value of the vacuum pressure detector within the target range.

[0008] To further explain, the discharge pipeline is equipped with an inlet valve, which is an electrically controlled valve and is electrically connected to the electrical control module.

[0009] Further explanation is that the negative pressure module includes a negative pressure buffer chamber and a vacuum suction device for evacuating the negative pressure buffer chamber. The negative pressure buffer chamber is connected to the collector through a pressure-inducing pipe. A flow regulating valve is provided on the gas delivery path of the vacuum suction device. The vacuum suction device, the flow regulating valve and the electrical control module are electrically connected.

[0010] To further explain, the negative pressure buffer chamber is equipped with a pressure sensor and a liquid level sensor. Both the pressure sensor and the liquid level sensor are electrically connected to the electronic control module and are used to monitor the pressure and liquid level in the negative pressure buffer chamber, respectively.

[0011] To further explain, a filter layer is connected to the pipe between the vacuum suction device and the flow regulating valve. The filter layer includes a mesh layer and an activated carbon adsorption layer.

[0012] A control method for a redundant positive pressure control system at the inlet of a metering pump includes the following steps: S1: Material collection: The liquid medicine in the medicine tank is guided to the collector through the dispensing pipeline; S2: Monitoring: During the process of increasing liquid in the collector, the level transmitter monitors the liquid level value of the reagent tank, the vacuum pressure detector monitors the pressure value of the collector, and the electronic control module receives the liquid level value and the pressure value. S3. Feedback: The electronic control module generates a control signal for the negative pressure module based on the liquid level and pressure values. This signal draws gas from the collector, reducing its internal redundant positive pressure and maintaining the pressure detected by the vacuum pressure detector within the target range. The electronic control module is an adaptive control module used to store and analyze historical liquid level and pressure data. It incorporates a preset algorithm that predicts the dynamic response of the collector pressure to a drop in liquid level based on data. According to the prediction results, the operating parameters of the negative pressure module are adjusted in advance before the pressure deviates from the preset value.

[0013] To further explain, the dynamic impact of the drop in the liquid level of the medicine tank on the pressure of the collector is predicted by a preset algorithm, including: applying a time series analysis algorithm to establish a prediction model with historical liquid level data as input and future pressure changes as output; inputting the real-time liquid level data into the prediction model, outputting the predicted value of the collector pressure, and generating control commands accordingly.

[0014] To further explain, the actual pressure value fed back by the vacuum pressure detector is continuously compared with the predicted value of the prediction model; when the deviation between the actual value and the predicted value continues to exceed the preset tolerance, the prediction is determined to be invalid, and the system switches to the PID closed-loop control mode based on real-time pressure feedback, while generating an early warning message.

[0015] Further explanation is that it also includes a remote monitoring terminal that is communicatively connected to the electronic control module. The remote monitoring terminal receives real-time pressure, liquid level, and equipment status data; the remote monitoring terminal remotely modifies the target pressure preset value of the collector and receives fault and early warning information.

[0016] The beneficial effects are as follows: by monitoring the liquid level data of the reagent tank and the vacuum pressure data of the collector, and combining the linkage control of the negative pressure module by the electronic control module, the negative pressure module actively draws gas from the collector to quickly reduce the redundant positive pressure, and maintains the pressure in the collector within the target range. This avoids the problems of increased reagent delivery resistance and unstable metering pump feed caused by excessive positive pressure, and also prevents the impact of pressure fluctuations on the metering accuracy of the metering pump. It improves the reliability, stability and accuracy of the metering pump operation and the precision of reagent delivery, and adapts to the reagent metering and delivery needs under different working conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the structure of the present invention.

[0019] The following are the annotations in the attached diagram: 1. Collector; 2. Inlet valve; 3. Vacuum pressure detector; 4. Pressure tap; 5. Negative pressure buffer chamber; 6. Vacuum suction device; 7. Flow regulating valve; 8. Electrical control module; 9. Chemical tank; 10. Level transmitter; 11. Metering pump. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] First embodiment: See Figure 1 As shown, this invention provides a redundant positive pressure control system for the inlet of a metering pump, including a reagent tank 9 for containing liquid reagents. A level transmitter 10 is installed on the reagent tank 9, which monitors the liquid level in the reagent tank 9 in real time and transmits the collected level signal to the electronic control module 8. A discharge pipe is provided at the bottom of the reagent tank 9 to guide the liquid reagent in the tank 9 to a pressure buffer unit. The pressure buffer unit includes a collector 1, whose inlet is connected to the end of the discharge pipe via a pipe, serving to buffer the reagent flow and balance the pressure, effectively preventing pressure fluctuations caused by flow rate changes during reagent delivery, and providing a stable feeding environment for the metering pump 11. A vacuum pressure detector 3 is installed on the collector 1, which is mainly used to collect pressure data inside the collector 1, including positive pressure, negative pressure, and normal pressure states, and feeds the pressure signal back to the electronic control module 8 in real time, becoming the signal for the electronic control module 8. The pressure control module operates based on the following: The outlet pipe of the collector 1 is connected to the metering pump 11. By adjusting the pressure inside the collector 1, the reagent after pressure buffering can be delivered to the metering pump 11, ensuring the pressure at the suction end of the metering pump 11 is stable and improving the metering accuracy and operational stability of the metering pump 11; The negative pressure module is connected to the collector 1 and reduces redundant positive pressure by absorbing gas inside the collector 1; The negative pressure module uses the reduction of gas to help stabilize the positive pressure value inside the collector 1, effectively eliminating redundant positive pressure caused by factors such as reagent delivery and changes in ambient temperature; It also includes an electrical control module 8. The level transmitter 10, vacuum pressure detector 3, and negative pressure module are all electrically connected to the electrical control module 8. The electrical control module 8 controls the negative pressure module based on the signals from the level transmitter 10 and the vacuum pressure detector 3 to maintain the detection value of the vacuum pressure detector 3 on the collector 1 within the target range.

[0022] In specific control, when the positive pressure in the collector 1 exceeds the target range, the negative pressure module can quickly respond to the command of the electronic control module 8 to increase the working rate of the suction operation. By discharging gas, the pressure environment in the collector 1 is adjusted to ensure that the agent can enter the metering pump 11 under stable pressure conditions, thus avoiding the problem of excessive positive pressure leading to increased agent delivery resistance or abnormal inlet pressure of the metering pump 11.

[0023] A control method for a redundant positive pressure control system at the inlet of a metering pump includes the following steps: S1: Material collection: Liquid medicine in the medicine tank 9 is guided to the collector 1 through the discharge pipeline; the liquid medicine pre-stored in the medicine tank 9 is directed to the collector 1 of the pressure buffer unit through the discharge pipeline set at its bottom under its own gravity or driven by auxiliary conveying power.

[0024] S2: Monitoring: During the process of increasing liquid in the collector 1, the level transmitter 10 monitors the liquid level of the reagent tank 9, the vacuum pressure detector 3 monitors the pressure of the collector 1, and the electronic control module 8 receives the liquid level and pressure values. As the level transmitter 10 monitors the liquid level of the reagent tank 9, it can collect the liquid level of the remaining reagent in the tank in real time, accurately reflecting the material reserve status of the reagent tank 9. In addition, as the reagent is conveyed, the delivery rate of the reagent can also be monitored. The vacuum pressure detector 3 can continuously monitor the pressure changes inside the collector 1, capturing any positive pressure increase that may occur during the liquid increase process. The electronic control module 8, through a preset signal transmission line, synchronously receives the liquid level signal from the level transmitter 10 and the pressure signal from the vacuum pressure detector 3, providing real-time and accurate raw data support for subsequent feedback control.

[0025] The liquid agent in the agent tank 9 can be regarded as a static fluid. The liquid level height monitored by the liquid level transmitter 10 directly determines the static pressure generated by the liquid on the outlet of the agent pipeline, that is, the static pressure generated at the inlet of the collector 1, which is P=ρgh, where ρ is the agent density, g is the acceleration due to gravity, and h is the height difference between the liquid level height of the agent tank and the inlet of the collector.

[0026] Specifically: When the liquid level in the reagent tank 9 is high, i.e. the h value is large, the static pressure of the liquid on the inlet of the collector 1 is stronger; when the reagent flows into the collector 1 through the outlet pipe, it not only occupies the internal space of the collector 1 and compresses the gas therein, but also causes the liquid to flow in faster due to the static pressure, further aggravating the degree of gas compression in the collector 1, and ultimately increasing the positive pressure value detected by the vacuum pressure detector 3, making redundant positive pressure more likely to be generated.

[0027] When the liquid level in the reagent tank 9 is low, the h value decreases, the static pressure weakens, the rate at which the reagent flows into the collector 1 slows down, the liquid volume in the collector 1 increases gradually, the degree of gas compression decreases, and the corresponding positive pressure value is relatively low. If the liquid level is too low, insufficient static pressure may also cause the reagent flow rate to be less than the suction rate of the metering pump 11, or even cause negative pressure to appear in the collector 1.

[0028] In accordance with the structure of this application, when liquid is being transported toward the collector 1, the level transmitter 10 will also monitor the liquid level drop in real time, i.e., the rate of liquid level drop. If the liquid level drops too quickly, a local negative pressure may be generated in the reagent tank 9 due to untimely liquid replenishment, causing the flow rate of the reagent flowing into the collector 1 to fluctuate. The electronic control module 8 can control the opening of the inlet valve 2 to ensure the rate of liquid level drop of the collector 1. When the liquid level is too low, the electronic control module 8 needs to reduce the opening of the inlet valve 2, resulting in a decrease in the flow rate into the collector 1 and a slow pressure rise. When the liquid level is sufficient, the opening of the inlet valve 2 is larger, the flow rate increases, and the rate of pressure rise accelerates, thereby amplifying or buffering the influence of the liquid level on the pressure of the collector 1, indirectly affecting the pressure detection value, and making the detection value of the vacuum pressure detector 3 more accurate.

[0029] S3, Feedback: The electronic control module 8 generates a working signal to control the negative pressure module based on the liquid level and pressure values, draws gas from the collector 1, reduces the redundant positive pressure inside, and keeps the pressure value detected by the vacuum pressure detector 3 within the target range; wherein, the electronic control module 8 is an adaptive control module used to store and analyze historical liquid level and pressure data; the electronic control module (8) is equipped with a preset algorithm, the prediction algorithm predicts the dynamic response of the liquid level drop to the pressure of the collector 1 based on the data; according to the prediction results, the operating parameters of the negative pressure module are adjusted in advance before the pressure deviates from the preset value.

[0030] Specifically, when redundant positive pressure is detected in the collector 1 and the pressure value is higher than the preset target, the electronic control module 8 immediately generates a corresponding control signal and sends it to the negative pressure module. After receiving the signal, the negative pressure module starts working and actively draws the gas inside the collector 1 through the pipeline connected to the collector 1. By discharging the gas, the positive pressure intensity in the collector 1 is reduced, and the redundant positive pressure is accurately reduced. During the suction process, the vacuum pressure detector 3 continuously feeds back pressure data. The electronic control module 8 dynamically adjusts the operating status of the negative pressure module according to the real-time feedback signal until the pressure value detected by the vacuum pressure detector 3 is stably maintained within the preset target range, ensuring that the inlet pressure environment of the metering pump 11 meets the operating requirements.

[0031] The adaptive predictive control electronic control module 8 adopts an adaptive control algorithm. Its internal storage unit can record historical liquid level values, corresponding pressure change data, and adjustment parameters of the negative pressure module under different operating conditions. Through statistical analysis of these historical data, the electronic control module 8 can establish a correlation model between liquid level changes and the pressure response of the collector 1, and then predict the dynamic change trend of the pressure of the collector 1 during the subsequent liquid level drop. Based on the prediction results, the electronic control module 8 can issue adjustment commands in advance before the pressure of the collector 1 deviates from the preset value, control the negative pressure module to start in advance or adjust the operating intensity, realize "predictive" active control of pressure, and further improve the stability of the pressure inside the collector 1.

[0032] The dynamic impact of the rate of drop in the liquid level of the reagent tank 9 on the pressure of the collector 1 is predicted by a preset algorithm, including: applying a time series analysis algorithm to establish a prediction model with historical liquid level data as input and future pressure changes as output; inputting the real-time liquid level data into the prediction model, outputting the predicted value of the pressure of the collector 1, and generating control commands accordingly.

[0033] The time series analysis algorithm in the preset algorithm utilizes the temporal correlation between liquid level changes and pressure response in historical data to construct an accurate dynamic prediction model. Since the storage unit of the electronic control module 8 has pre-accumulated historical liquid level data under different operating conditions, including key parameters such as the liquid level value of the reagent tank 9 at different time periods, the rate of liquid level decline, and the duration of liquid level changes, it also stores corresponding pressure change data of the collector 1 under various historical liquid level states, such as the magnitude of pressure increase / decrease, pressure stabilization time, and the correspondence between pressure and the rate of liquid level decline. Through the time series analysis algorithm, trend extraction, correlation analysis, and pattern modeling are performed on this historical data, ultimately establishing a prediction model with historical liquid level data as input variables and future pressure changes in the collector 1 as output variables. This model captures the intrinsic correlation between changes in the rate of liquid level decline and the dynamic pressure response of the collector 1, providing reliable algorithmic support for subsequent real-time prediction.

[0034] During system operation, the level transmitter 10 continuously collects real-time level data from the reagent tank 9, including the current level value and the real-time calculated level drop rate, and synchronously transmits this real-time data to the electronic control module 8 via a signal transmission line. The electronic control module 8 preprocesses the received real-time level data according to a preset format and inputs it into the established time series prediction model. Based on pre-trained algorithm logic, the prediction model performs rapid calculations on the real-time input data and outputs the pressure prediction results of the collector 1 within a preset time period in the future, including key information such as pressure change trend, predicted pressure value, whether it may exceed the target range, and the expected time node for deviation from the target range. The electronic control module 8 analyzes and judges the pressure prediction value. If the prediction result shows that the pressure of the collector 1 will deviate from the target range in the future, it immediately generates corresponding control commands. The command content includes adjustment parameters such as the early start time of the negative pressure module, operating power, and suction duration, thereby realizing predictive control of the pressure of the collector 1 and avoiding the generation of redundant positive pressure or abnormal pressure fluctuations.

[0035] While the system uses a predictive model for pressure prediction control, the electronic control module 8 initiates a continuous comparison mechanism to perform real-time dynamic verification of two types of pressure data: on the one hand, it continuously receives the actual pressure value of the collector 1 from the vacuum pressure detector 3 through the signal transmission line to ensure that the acquired data truly reflects the current pressure state; on the other hand, it synchronously retrieves the predicted pressure value of the collector 1 within the same time period output by the predictive model; the electronic control module 8 has a preset data comparison algorithm that calculates the difference between the actual pressure value and the predicted value at fixed time intervals, which can be 100ms / time, to obtain the real-time deviation value between the two, and records the trend and duration of the deviation value, thereby verifying the accuracy and adaptability of the predictive model and providing a basis for judgment for subsequent control mode switching.

[0036] The electronic control module 8 has a preset deviation tolerance, which is determined based on factors such as the system's operating accuracy requirements and the working pressure adaptation range of the metering pump 11. It continuously monitors the relationship between the real-time deviation value and the preset tolerance. When the deviation between the actual pressure value and the predicted value continuously exceeds the preset tolerance, such as three consecutive deviations or a continuous deviation exceeding the tolerance for 2 seconds, to avoid misjudgment caused by a single fluctuation, the electronic control module 8 immediately initiates a control mode switching program, quickly cutting off the predictive control based on the predictive model and switching to a PID closed-loop control mode based on real-time pressure feedback. In the PID closed-loop control mode, the electronic control module 8 uses the real-time actual pressure value fed back by the vacuum pressure detector 3 as the core input. It calculates the deviation between the actual pressure value and the target pressure value through a PID algorithm, dynamically adjusts the control signal output to the negative pressure module, and adjusts the suction intensity and operating status of the negative pressure module in real time to ensure that the pressure in the collector 1 quickly returns to and stabilizes within the target range, thus guaranteeing the normal operation of the metering pump 11.

[0037] While determining the predicted failure and completing the control mode switch, the electronic control module 8 automatically generates early warning information. The early warning information includes the time of the predicted failure determination, the deviation range between the actual pressure value and the predicted value, the control mode switch result, and suggested checks for pipeline blockage, changes in reagent properties, and the need to update the prediction model parameters. This early warning information is displayed visually through the display terminal connected to the electronic control module 8, and can also be triggered by an audible and visual alarm. Furthermore, it includes a remote monitoring terminal that is communicatively connected to the electronic control module 8. The remote monitoring terminal receives real-time pressure, liquid level, and equipment status data. The remote monitoring terminal can remotely modify the target pressure preset value of the collector 1 and receive fault and early warning information.

[0038] The remote monitoring terminal establishes a stable two-way communication link with the electronic control module 8 via wired or wireless communication to achieve real-time transmission and remote monitoring of system operation data. During system operation, the electronic control module 8 integrates and processes the real-time pressure value of the collector 1 collected by the vacuum pressure detector 3, the real-time liquid level value of the reagent tank 9 collected by the liquid level transmitter 10, and the operating status data of each core device, mainly including the start / stop status, operating intensity, and fault status of the negative pressure module, the working status of the metering pump 11, and the control mode of the electronic control module 8, and continuously pushes it to the remote monitoring terminal. The remote monitoring terminal presents the received data intuitively through a visual interface, allowing operators to monitor the material supply status, pressure control effect, and equipment operation status of the system in real time without going to the site, providing data support for remote management and decision-making, and improving the convenience and efficiency of system operation and maintenance.

[0039] The remote monitoring terminal has the authority to remotely modify the target pressure preset value of the collector 1, meeting the differentiated pressure control needs of different working conditions and different reagent characteristics. When it is necessary to adjust the target pressure value, the operator can input the new target pressure parameter through the interactive interface of the remote monitoring terminal and confirm the submission of the modification command. The modification command is transmitted to the electrical control module 8 in real time through the communication link. After receiving the command, the electrical control module 8 automatically updates the target pressure preset value stored in its internal storage and uses the new preset value as the benchmark for pressure control to adjust the control logic of the negative pressure module. The entire modification process does not require on-site disassembly or debugging of the equipment, realizing remote and rapid adjustment of pressure parameters, which greatly improves the flexibility and adaptability of the system, and is especially suitable for scenarios that require frequent switching of reagents or adjustment of process parameters.

[0040] The remote monitoring terminal establishes a synchronous transmission mechanism for early warning information with the electrical control module 8, enabling it to receive various fault and early warning information generated by the system in real time. When the system experiences abnormal states such as predictive model failure warning, low liquid level warning, pressure exceeding the target range of collector 1, negative pressure module malfunction, or metering pump 11, the electrical control module 8 will immediately generate corresponding fault or early warning information, along with detailed information such as the fault occurrence time, fault type, relevant equipment number, and real-time data snapshot, and push it to the remote monitoring terminal via the communication link. After receiving the information, the remote monitoring terminal will remind the operator through pop-up prompts, audible and visual alarms, and message pushes, ensuring that the operator is aware of the system abnormality as soon as possible. The use of the remote monitoring terminal not only facilitates the operator's timely awareness of system abnormalities and the implementation of targeted troubleshooting and handling measures, but also stores and archives historical fault and early warning information, making it convenient for the operator to query and trace the cause of the fault later.

[0041] The second embodiment differs from the first embodiment in that: An inlet valve 2 is installed on the outlet pipeline. The inlet valve 2 is an electrically controlled valve, which is electrically connected to the electrical control module 8. The electrical control module 8 controls the opening degree of the inlet valve 2. By matching the opening degree with the liquid level detection data of the liquid level transmitter and the historical detection data of the vacuum pressure detector 3, the pressure value of the collector 1 is calculated in advance based on the opening degree of the inlet valve 2. In order to further ensure the pressure stability inside the collector 1, the negative pressure module can be controlled in advance by the electrical control module 8 to operate the collector 1 in advance. In another embodiment, the inlet valve 2 is a float valve. When the liquid level in the collector 1 decreases, the inlet valve 2 is in the open state. When the liquid level in the collector 1 increases, the inlet valve 2 is in the closed state. According to the historical state, the working efficiency of the negative pressure module is adjusted by the electrical control module 8.

[0042] The negative pressure module includes a negative pressure buffer chamber 5 and a vacuum suction device 6 for evacuating the negative pressure buffer chamber 5. The output end of the vacuum suction device 6 is connected to the negative pressure buffer chamber 5, enabling a stable negative pressure environment to be formed within the negative pressure buffer chamber 5. The negative pressure buffer chamber 5 is connected to the collector 1 via a pressure tapping pipe 4, which smoothly introduces redundant gas from the collector 1 into the negative pressure buffer chamber 5. A flow regulating valve 7 is installed on the gas delivery path of the vacuum suction device 6, which precisely regulates the pumping flow rate of the vacuum suction device 6, thereby controlling the negative pressure intensity of the negative pressure buffer chamber 5. The vacuum suction device 6, the flow regulating valve 7, and the electrical control module 8 are also included. Electrically connected, the electronic control module 8 can dynamically adjust the operating status of the vacuum suction device 6 (start, stop, variable speed operation, etc.) and the opening degree of the flow regulating valve 7 based on the real-time pressure value of the collector 1 fed back by the vacuum pressure detector 3. When the positive pressure in the collector 1 exceeds the target range, the electronic control module 8 starts the vacuum suction device 6 and adjusts the flow regulating valve 7 to the corresponding opening degree, sucking the gas in the collector 1 through the negative pressure buffer chamber 5 and the pressure tapping pipe 4. When the pressure drops to the target range, the electronic control module 8 can control the vacuum suction device 6 to stop operating or adjust the flow regulating valve 7 to reduce the opening degree, realizing energy-saving operation of the negative pressure module and pressure control.

[0043] The negative pressure buffer chamber 5 is equipped with a pressure sensor and a liquid level sensor, both of which are electrically connected to the electronic control module 8. The pressure sensor is used to accurately monitor the real-time pressure value within the negative pressure buffer chamber 5, capturing the changing trend of the negative pressure intensity in the chamber and synchronously transmitting the pressure signal to the electronic control module 8. This provides supplementary pressure information for the electronic control module 8 to adjust the operating status of the vacuum suction device 6 and the opening of the flow regulating valve 7, preventing excessively high or low negative pressure within the negative pressure buffer chamber 5 from affecting the redundant positive pressure in the collector 1. The pressure is controlled by a suction sensor; the liquid level sensor is used to monitor the liquid level in the negative pressure buffer chamber 5 in real time. When a small amount of medicine enters the negative pressure buffer chamber 5 with the gas during the suction process and accumulates to the preset liquid level, the liquid level sensor will feed back the liquid level signal to the electronic control module 8. The electronic control module 8 can generate early warning information or control the corresponding valves on the relevant negative pressure buffer chamber 5 to discharge the liquid, so as to prevent the negative pressure buffer chamber 5 from becoming less efficient due to excessive liquid accumulation, or the liquid from entering the vacuum suction device 6 and causing equipment damage, thus ensuring the long-term stable operation of the negative pressure module.

[0044] A filter layer is connected to the pipe between the vacuum suction device 6 and the flow regulating valve 7. The filter layer includes a mesh layer and an activated carbon adsorption layer.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A redundant positive pressure control system for a metering pump inlet, comprising a reagent tank (9), a pressure buffer unit, and a negative pressure module, characterized in that: The reagent tank (9) is equipped with a level transmitter (10), and the bottom of the reagent tank (9) is equipped with a dispensing pipeline; the pressure buffer unit includes a collector (1), the inlet of the collector (1) is connected to the end of the dispensing pipeline, the collector (1) is equipped with a vacuum pressure detector (3), and the outlet pipeline of the collector (1) is connected to a metering pump (11); the negative pressure module is connected to the collector (1) and reduces redundant positive pressure by absorbing gas in the collector (1); it also includes an electrical control module (8), the level transmitter (10), the vacuum pressure detector (3), and the negative pressure module are all electrically connected to the electrical control module (8), and the electrical control module (8) controls the negative pressure module based on the signals of the level transmitter (10) and the vacuum pressure detector (3) to maintain the detection value of the vacuum pressure detector (3) within the target range.

2. The redundant positive pressure control system for the inlet of a metering pump according to claim 1, characterized in that: The discharge pipeline is equipped with an inlet valve (2), which is an electrically controlled valve and is electrically connected to the electrical control module (8).

3. The redundant positive pressure control system for the inlet of a metering pump according to claim 2, characterized in that: The negative pressure module includes a negative pressure buffer chamber (5) and a vacuum suction device (6) for evacuating the negative pressure buffer chamber (5). The negative pressure buffer chamber (5) is connected to the collector (1) through a pressure pipe (4). A flow regulating valve (7) is provided on the gas delivery path of the vacuum suction device (6). The vacuum suction device (6), the flow regulating valve (7) and the electrical control module (8) are electrically connected.

4. The redundant positive pressure control system for the inlet of a metering pump according to claim 3, characterized in that: The negative pressure buffer chamber (5) is equipped with a pressure sensor and a liquid level sensor. Both the pressure sensor and the liquid level sensor are electrically connected to the electronic control module (8) and are used to monitor the pressure and liquid level in the negative pressure buffer chamber (5), respectively.

5. The redundant positive pressure control system for the inlet of a metering pump according to claim 4, characterized in that: A filter layer is connected to the pipe between the vacuum suction device (6) and the flow regulating valve (7). The filter layer includes a mesh layer and an activated carbon adsorption layer.

6. A control method for a redundant positive pressure control system for a metering pump inlet as described in any one of claims 1-5, characterized in that: Includes the following steps: S1: Material collection: The liquid medicine in the medicine tank (9) is guided to the collector (1) through the dispensing pipeline. S2: Monitoring: During the process of increasing liquid in the collector (1), the level transmitter (10) monitors the liquid level value of the reagent tank (9), the vacuum pressure detector (3) monitors the pressure value of the collector (1), and the electronic control module (8) receives the liquid level value and the pressure value. S3, Feedback: The electronic control module (8) generates a working signal to control the negative pressure module based on the liquid level and pressure values, draws gas from the collector (1), reduces the redundant positive pressure inside, and keeps the pressure value detected by the vacuum pressure detector (3) within the target range. The electronic control module (8) is an adaptive control module used to store and analyze historical liquid level and pressure data. The electrical control module (8) is equipped with a preset algorithm, which predicts the dynamic response of the liquid level drop to the pressure of the collector (1) based on data. Based on the prediction results, the operating parameters of the negative pressure module are adjusted in advance before the pressure deviates from the preset value.

7. The control method for a redundant positive pressure control system at the inlet of a metering pump according to claim 6, characterized in that: The dynamic impact of the drop in liquid level in the reagent tank (9) on the pressure of the collector (1) is predicted by a preset algorithm, including: applying a time series analysis algorithm to establish a prediction model with historical liquid level data as input and future pressure changes as output; inputting the real-time liquid level data into the prediction model, outputting the predicted value of the pressure of the collector (1), and generating control commands accordingly.

8. The control method for a redundant positive pressure control system at the inlet of a metering pump according to claim 6, characterized in that: The actual pressure value fed back by the vacuum pressure detector (3) is continuously compared with the predicted value of the prediction model. When the deviation between the actual value and the predicted value continues to exceed the preset tolerance, the prediction is determined to be invalid and the system switches to the PID closed-loop control mode based on real-time pressure feedback, while generating an early warning message.

9. The control method for a redundant positive pressure control system at the inlet of a metering pump according to claim 8, characterized in that: It also includes a remote monitoring terminal that is connected to the electronic control module (8) for communication. The remote monitoring terminal receives real-time pressure, liquid level and equipment status data. The remote monitoring terminal remotely modifies the target pressure preset value of the collector (1) and receives fault and early warning information.

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