Self-Calibrating Peristaltic Pump for Low-Pulsation Fluid Flow
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Solution Overview
Problem
Linear peristaltic pumps suffer from pulsating fluid flow due to pressure fluctuations and excessive wear of flexible conduits, which existing designs struggle to address effectively.
Innovation Solution
A system with multiple pistons operating in coordinated multi-phase sequences and self-calibration mechanisms to adjust to different conduit sizes, minimizing fluid pulsations and reducing conduit wear by dynamically controlling piston positions and forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the number of fingers is increased to reduce pulsation, then the magnitude of pulsation decreases, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies dynamics by varying the speed of outside fingers relative to inside fingers. Outside fingers move faster than inside fingers, creating a dynamic speed differential that reduces pulsation magnitude without requiring an increased number of fingers. This dynamic approach allows 8 fingers to achieve the pulsation reduction that would otherwise require 10-14 fingers.
Solution Approach 2:
The patent changes the velocity parameter of different fingers. By setting outside fingers to move at a different speed (faster) than inside fingers, the system alters the operational parameters to reduce pulsation. This parameter change enables effective pulsation control with a fixed, smaller number of fingers.
2Speed
If outside fingers move faster to increase pulsation frequency, then the pulsation frequency increases, but the mechanical stress and wear on the flexible conduit increase
Solution Approach 1:
The system uses dynamic speed variation where outside fingers move faster than inside fingers during the compression stroke. This creates a wave pattern that moves more quickly, increasing pulsation frequency while distributing mechanical stress more evenly across the conduit, thereby reducing wear.
Solution Approach 2:
The patent implements periodic action through the coordinated cyclic motion of fingers at different speeds. The outside fingers complete their compression cycle more rapidly than inside fingers, creating a periodic pattern that increases overall pulsation frequency while the coordinated timing reduces peak stress on any single conduit section.
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
Achieves nearly pulse-free fluid flow and improved conduit durability by coordinating piston movements and automatically calibrating to accommodate various conduit dimensions.
Implementation Method 1
the first piston and the second piston are operable to compress the flexible conduit by pressing the flexible conduit against the anvil
Data Source
AI summary
A linear peristaltic pump can include an anvil, a first piston and a second piston. The anvil supports a flexible conduit having a first cavity and a second cavity. The first piston pumps a fluid through the first cavity by repeatedly moving through a first sequence that includes a first cavity filling phase and a first cavity emptying phase. The second piston pumps the fluid through the second cavity by repeatedly moving through a second sequence that includes a second cavity full phase, a second cavity emptying phase that pushes the fluid into the first cavity, a second cavity empty phase that prevents the fluid from flowing into the second cavity, and a second cavity filling phase. The first piston and the second piston may compress the flexible conduit by pressing the flexible conduit against the anvil. The first sequence is a two phase sequence.