Peristaltic Pump Dosing Control via Pipeline Switching
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Solution Overview
Problem
Peristaltic pumps experience significant dosing errors due to pulsation and position variation of the tubing squeezed point, leading to inaccuracies in liquid volume transfer, especially with larger tubing diameters, which also shorten the tubing's service life and reduce efficiency.
Innovation Solution
A peristaltic pump precise dosing control system that includes a driver, pump head, pipeline switching means, metering pipeline, and discharge pipeline, with position detection mechanisms using magnetic sensors or Hall sensors to ensure precise dosing by switching the outlet end of the elastic tubing between discharge and metering pipelines at predetermined positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a tubing with a smaller inner diameter is selected to guarantee dosing precision, then dosing error is reduced, but filling time is prolonged and tubing service life is shortened
Solution Approach 1:
The system performs preliminary positioning of the pump head to a predetermined start position before dosing begins. Position detection means detect when the pump head reaches the start position, and the pipeline switching means switches to connect the metering pipeline before liquid transfer starts. This preliminary setup ensures precise dosing from the beginning without requiring smaller tubing that would slow down filling.
Solution Approach 2:
The patent introduces a pipeline switching means as an intermediary component that directs liquid flow between different pipelines (metering pipeline and discharge pipeline) based on pump head position. This intermediary mechanism enables precise control of liquid transfer timing and routing, achieving accurate dosing with larger tubing diameters without extending filling time.
2Manufacturing precision
If a tubing with a smaller inner diameter is selected to guarantee dosing precision, then dosing error is reduced, but tubing service life is shortened
Solution Approach 1:
The system performs preliminary positioning of the pump head to a predetermined start position before dosing begins. Position detection means detect when the pump head reaches the start position, and the pipeline switching means switches to connect the metering pipeline before liquid transfer starts. This preliminary setup ensures precise dosing from the beginning without requiring smaller tubing that would slow down filling.
Solution Approach 2:
The patent introduces a pipeline switching means as an intermediary component that directs liquid flow between different pipelines (metering pipeline and discharge pipeline) based on pump head position. This intermediary mechanism enables precise control of liquid transfer timing and routing, achieving accurate dosing with larger tubing diameters without extending filling time.
3Manufacturing precision
If the outlet end of the elastic tubing is always connected to the metering pipeline, then dosing precision is maintained, but liquid is wasted during pump head positioning
Solution Approach 1:
The system dynamically switches the connection state of the pipeline switching means based on the real-time position of the pump head. When the pump head is at the predetermined start position, the outlet end of the elastic tubing is connected to the metering pipeline for precise dosing. When the pump head is not at the start position, the outlet end is connected to the discharge pipeline, preventing liquid waste during positioning movements.
Solution Approach 2:
Position detection means continuously monitor the pump head position and provide feedback signals to the driver and pipeline switching means. This feedback mechanism enables the system to automatically switch between metering and discharge pipeline connections at appropriate times, ensuring precise dosing when needed and preventing liquid waste during positioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves high precision dosing, maintains the advantages of peristaltic pumps like cleanliness and controllability, and extends tubing service life while reducing filling time and increasing efficiency, eliminating dosing transfer errors caused by pulsation.
Implementation Method 1
a plurality of rollers on the circumference of the roller wheel alternately and sequentially squeeze the elastic tubing towards a compression block and then release it, thereby forming a negative pressure in the elastic tubing to pump the liquid
Implementation Method 2
the driver is electrically connected to the pipeline switching means so as to be capable of controlling the pipeline switching means to switch to the output pipeline to which the outlet end of the elastic tubing is connected; in response to a position detection signal that the driver has driven the pump head to rotate to a predetermined start position
Data Source
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Figure 3
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AI summary
A peristaltic pump precise dosing control system comprises: a pump head (2); an elastic tubing provided in the pump head (2), an outlet end of the elastic tubing being connected to a pipeline switching means (4); and a driver (1) for driving the pump head (2) to rotate to pump the liquid in the elastic tubing to the outlet end of the elastic tubing. The driver (1) is electrically connected to the pipeline switching means (4) so as to be capable of controlling the pipeline switching means to switch to the output line with which the outlet end of the elastic tubing is connected. In response to a position detection signal that the driver (1) drives the pump head (2) to rotate to a predetermined start position, the pipeline switching means (4) switches the outlet end of the elastic tubing from a state of connection with the discharge pipeline (5) to a state of connection with the metering pipeline (3). The corresponding control method of operating the peristaltic pump is also disclosed.