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CN-121976945-A - Pump speed dynamic calibration device and method based on weighing feedback

CN121976945ACN 121976945 ACN121976945 ACN 121976945ACN-121976945-A

Abstract

The application relates to a pump speed dynamic calibration device and method based on weighing feedback, which are applied to the technical field of biological pharmacy and comprise the steps of directly measuring weight change by a weighing module to calculate actual flow rate, getting rid of dependence on inaccurate and variable experience parameters such as 'per-rotation flux', and fundamentally ensuring the authenticity and accuracy of feedback data. The actual flow rate is compared with the target flow rate through a calibration algorithm arranged in the control module, and the rotation speed of the pump is adjusted in real time based on the deviation, so that a closed-loop control system is constructed. The system can respond in real time and automatically compensate flow speed deviation caused by various factors such as pump rotation speed nonlinearity, pipeline pressure fluctuation, abrasion and aging of the pump and the pipeline, remarkably improves the accuracy and stability of flow speed control, and enhances the adaptability and anti-interference capability of the device. The application realizes automatic calibration and stable control of flow, and is particularly suitable for continuous production process with high requirements on precision and stability.

Inventors

  • JIA GUILING
  • WANG FENGXUE

Assignees

  • 成器智造(北京)科技有限公司

Dates

Publication Date
20260505
Application Date
20260227

Claims (9)

  1. 1. A pump speed dynamic calibration device based on weighing feedback, the device comprising: the weighing module is used for collecting weight change data of a medium conveyed by the output end of the pump in real time; a pump for pumping the target delivery medium out of the output port within a rated rotational speed range; The data acquisition module is connected with the weighing module and used for acquiring weight data of the weighing module and sending the weight data to the control module; the control module is respectively connected with the data acquisition module and the driving unit of the pump, and is used for receiving the weight data sent by the data acquisition module, comparing the actual rotating speed with the target rotating speed according to a preset built-in calibration algorithm, generating a pump rotating speed adjustment instruction, and sending the pump rotating speed adjustment instruction to the driving unit of the pump; The driving unit is used for receiving the pump rotating speed adjusting instruction sent by the control module, and adjusting the actual rotating speed of the pump to the calibrated target rotating speed according to the pump rotating speed adjusting instruction so that the actual flow speed approaches to the preset target flow speed.
  2. 2. The apparatus of claim 1, wherein the device comprises a plurality of sensors, The output end of the pump is connected with the inlet of the medium storage container through a conveying pipeline; The weighing module collects weight change data of the media storage container.
  3. 3. The apparatus of claim 2, wherein the device comprises a plurality of sensors, The weighing module adopts a weighing sensor.
  4. 4. The apparatus of claim 3, wherein the device comprises a plurality of sensors, The control module is internally preset with the density and the target flow rate of a target conveying medium; The control module is used for receiving the weight data of the data acquisition module and converting the weight change into the actual flow rate of the pump according to the density of the preset target conveying medium and the weight change in the preset time interval.
  5. 5. The apparatus of claim 4, wherein the device comprises a plurality of sensors, The control module generates the rotation speed adjustment instruction by adopting at least one of proportional control, proportional integral control or proportional integral derivative control algorithm.
  6. 6. The apparatus of claim 5, wherein the device comprises a plurality of sensors, The pump is a peristaltic pump, a diaphragm pump or a plunger pump.
  7. 7. The apparatus of claim 6, wherein the device comprises a plurality of sensors, The data acquisition module and the weighing module, the control module and the data acquisition module, and the control module and the pump driving unit are communicated in a wired or wireless mode.
  8. 8. The apparatus of claim 7, wherein the device comprises a plurality of sensors, The data acquisition module is also used for carrying out filtering processing on the weight data so as to eliminate the pulsation influence in the pump conveying process.
  9. 9. A method for dynamically calibrating pump speed based on weighing feedback, wherein the method is based on a device for dynamically calibrating pump speed based on weighing feedback according to any one of claims 1-8, the method comprising: acquiring the weight variation of the pump output end in a preset time period; acquiring an actual flow rate according to the density, the weight change amount and the weight acquisition time interval of a preset target conveying medium; Acquiring the actual rotating speed of the pump, and acquiring the actual flux per rotation according to the actual flow speed and the actual rotating speed; Acquiring a calibrated target rotating speed according to the actual per-rotation quantity and a preset target flow rate; and adjusting the pump rotation speed according to the calibrated target rotation speed, and adjusting the actual rotation speed of the pump to the calibrated target rotation speed, so that the actual flow rate of the pump approaches to the preset target flow rate.

Description

Pump speed dynamic calibration device and method based on weighing feedback Technical Field The invention relates to the technical field of bio-pharmaceuticals, in particular to a pump speed dynamic calibration device and method based on weighing feedback. Background In fields requiring high-precision fluid control such as biopharmaceuticals and fine chemical engineering, peristaltic pumps, diaphragm pumps, plunger pumps and other pump devices are widely used. Currently, flow control for such pumps generally relies on a theoretical formula, "flow rate = rotational speed x per revolution", which assumes a pre-calibrated or set fixed value per revolution of the pump. However, such open-loop or semi-open-loop control schemes based on fixed parameters have inherent drawbacks. First, the per-revolution flux of the pump is not a constant value, it varies with the operating speed of the pump, the per-revolution flux of the pump varies at lower speeds and higher speeds within the rated speed range, and the fixed value cannot adapt to the flux variation caused by speed fluctuations. Second, the line pressure changes during pump operation affect the per-turn flow (the greater the pressure, the smaller the per-turn flow), and prior art solutions do not take into account this dynamic impact. Furthermore, pump or pipeline wear (such as peristaltic pump pipeline deformation and diaphragm pump membrane aging) can cause each revolution to change, and fixed parameters cannot be corrected in real time, so that insufficient flow rate control precision is finally caused, and the requirement of the biopharmaceutical field on accurate control of the pump flow rate cannot be met. Disclosure of Invention In view of the above, the invention aims to provide a device and a method for dynamically calibrating pump speed based on weighing feedback, which aim to solve the technical problems of low flow control precision and poor stability under dynamic working conditions caused by the fact that the flow control of a pump depends on fixed parameters in the prior art. According to a first aspect of an embodiment of the present invention, there is provided a pump speed dynamic calibration device based on weighing feedback, the device comprising: the weighing module is used for collecting weight change data of a medium conveyed by the output end of the pump in real time; a pump for pumping the target delivery medium out of the output port within a rated rotational speed range; The data acquisition module is connected with the weighing module and used for acquiring weight data of the weighing module and sending the weight data to the control module; the control module is respectively connected with the data acquisition module and the driving unit of the pump, and is used for receiving the weight data sent by the data acquisition module, comparing the actual rotating speed with the target rotating speed according to a preset built-in calibration algorithm, generating a pump rotating speed adjustment instruction, and sending the pump rotating speed adjustment instruction to the driving unit of the pump; The driving unit is used for receiving the pump rotating speed adjusting instruction sent by the control module, and adjusting the actual rotating speed of the pump to the calibrated target rotating speed according to the pump rotating speed adjusting instruction so that the actual flow speed approaches to the preset target flow speed. Preferably, the method comprises the steps of, The output end of the pump is connected with the inlet of the medium storage container through a conveying pipeline; The weighing module collects weight change data of the media storage container. Preferably, the method comprises the steps of, The weighing module adopts a weighing sensor. Preferably, the method comprises the steps of, The control module is internally preset with the density and the target flow rate of a target conveying medium; The control module is used for receiving the weight data of the data acquisition module and converting the weight change into the actual flow rate of the pump according to the density of the preset target conveying medium and the weight change in the preset time interval. Preferably, the method comprises the steps of, The control module generates the rotation speed adjustment instruction by adopting at least one of proportional control, proportional integral control or proportional integral derivative control algorithm. Preferably, the method comprises the steps of, The pump is a peristaltic pump, a diaphragm pump or a plunger pump. Preferably, the method comprises the steps of, The data acquisition module and the weighing module, the control module and the data acquisition module, and the control module and the pump driving unit are communicated in a wired or wireless mode. Preferably, the method comprises the steps of, The data acquisition module is also used for carrying out filtering processing on the weight data so as to e