Peristaltic Pump Squeeze Member Rolling Mechanism
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Solution Overview
Problem
Peristaltic pumps face challenges in achieving high dosing accuracy and compact size while minimizing friction forces and preventing material reflow, especially when handling sensitive materials like insulin.
Innovation Solution
A peristaltic pump design featuring a rotatable pump head with squeeze members that roll on the tube, reducing friction and allowing for easy tube exchange, with a support member and guide member configuration that ensures axial movement and radial positioning of the squeeze members to maintain consistent pressure and prevent reflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pump head is made compact with small dimensions in the longitudinal axis direction, then the overall device size is reduced, but it becomes difficult to achieve high dosing accuracy and maintain consistent squeezing pressure
Solution Approach 1:
The squeeze members are nested within the pump head structure, with multiple squeeze members arranged in a compact configuration around the rotation axis. The support member provides a nested framework that holds the squeeze members at precise positions, enabling compact pump head dimensions while maintaining accurate dosing through precise geometric arrangement of the nested components.
Solution Approach 2:
The pump head is designed to rotate about a rotation axis perpendicular to the longitudinal axis, creating dynamic motion of the squeeze members along the tube. This rotational dynamics enables consistent squeezing pressure through controlled angular movement, achieving high dosing accuracy within a compact volume by utilizing rotational kinematics rather than linear actuation.
2Force
If squeeze members are designed to roll on the tube, then friction forces are reduced and driving force requirements are minimized, but it becomes challenging to maintain consistent axial positioning and prevent tube misalignment
Solution Approach 1:
The squeeze members are designed with curved or spherical contact surfaces that roll on the tube, converting sliding friction into rolling friction. This curvature enables the squeeze members to rotate on their contact point with the tube, significantly reducing the driving force required while maintaining consistent axial positioning through the geometric constraint of the rolling motion.
Solution Approach 2:
The support member and guide member are configured in advance to establish precise geometric relationships with the tube before operation. The guide member pre-positions the tube in the correct axial alignment, and the support member pre-configures the squeeze members at specific radial positions, ensuring that when rolling motion begins, the tube is already properly aligned and will remain so throughout operation.
3Ease of operation
If the tube is arranged along a longitudinal axis with free sections, then tube exchange becomes easy and reproducible, but it increases the risk of material reflow between squeeze members
Solution Approach 1:
The linear tube configuration serves multiple functions: it enables easy and reproducible tube exchange through simple alignment along the longitudinal axis, and simultaneously prevents material reflow through the coordinated action of multiple squeeze members that can occlude the entire tube circumference. The universal linear arrangement accommodates both ease of operation and reliability requirements that would be conflicting in curved or complex tube paths.
Solution Approach 2:
Multiple squeeze members are arranged to continuously occlude the tube along its length, creating overlapping zones of compression. This continuous action ensures that at any given moment, multiple sections of the tube are being squeezed, preventing material reflow between squeeze members while maintaining the simple linear configuration that enables easy tube exchange.
4Volume of moving object
If the rotation axis is perpendicular to the longitudinal axis, then the pump head achieves compact size, but it requires precise radial positioning of squeeze members to maintain consistent squeezing pressure
Solution Approach 1:
The pump head is segmented into distinct functional components: the support member that provides radial positioning, the guide member that ensures axial alignment, and the squeeze members that perform the squeezing action. This segmentation allows each component to be precisely manufactured and assembled with high positioning accuracy, enabling compact dimensions while maintaining consistent squeezing pressure through the cumulative precision of the segmented parts.
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
This design achieves high dosing accuracy, low driving force requirements, and compact size, ensuring efficient and reliable transport of sensitive materials like insulin with minimal reflow and misalignment risks.
Implementation Method 1
the squeeze member is enabled to roll off on the tube when squeezing the tube. In this way, friction forces may be kept small.
Implementation Method 2
a peristaltic pump comprises a tube for transporting a material... a rotatable pump head for causing a squeezing of the tube... the pump head causes a squeezing of the tube along the longitudinal axis of the tube, in particular along the transport direction.
Data Source
AI summary
A peristaltic pump comprises a tube for transporting a material, wherein the tube is arranged linearly along a longitudinal axis. The peristaltic pump further comprises a pump head for causing a squeezing of the tube, wherein the pump head is rotatable about a rotation axis.