Dual-Head Peristaltic Pump with 180-Degree Phase Offset
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Solution Overview
Problem
Existing peristaltic pumps face issues with non-steady flow or pulsations, high flexible tube wear, high maintenance costs, and inaccurate metering due to friction, heat generation, and complex designs that lead to mechanical failures and frequent calibration needs.
Innovation Solution
A dual-head peristaltic pump design with a single roller element made of ceramic materials and a unique tube routing path that minimizes pulsation, reduces friction, and maintains constant tube pressure, using a 180-degree phase difference between pump housings to compensate for pulsations and eliminate stress on the tube, thereby reducing maintenance and energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metal cast rollers with high thermal conductivity are used, then heat dissipation is improved, but the hose is damaged by friction heat
Solution Approach 1:
The roller is constructed as a composite structure with a metal core providing thermal conductivity for heat dissipation, and an outer coating layer (such as PTFE or other low-friction materials) that reduces friction and prevents heat transfer to the hose. This composite design allows the roller to dissipate internal heat while protecting the hose from friction-generated heat.
Solution Approach 2:
An intermediary coating layer is introduced between the metal roller and the hose. This coating acts as a thermal and friction barrier, allowing the metal roller to dissipate heat internally while the coating prevents direct heat transfer to the hose, thereby protecting the hose from thermal damage.
2Stability of the object's composition
If the number of rollers is increased, then fluid pulsing amplitude is decreased, but flow rate is reduced
Solution Approach 1:
The pump head is divided into multiple roller elements that independently occlude and advance the hose. By strategically positioning these rollers and optimizing their occlusion timing, the system segments the pumping action to smooth out pulsations while maintaining adequate flow rate through proper synchronization of the segmented actions.
Solution Approach 2:
The rollers are positioned and timed to create periodic occlusion patterns that overlap in a way that smooths the overall flow output. The periodic action of multiple rollers is synchronized so that when one roller releases the hose, another is already advancing it, creating a more continuous and stable flow with reduced pulsation amplitude.
3Productivity
If more squeezing force is applied to the tubing, then pumping efficiency is improved, but tubing life decreases dramatically
Solution Approach 1:
The roller material is changed from traditional hard materials to softer, more compliant materials that can deform and conform to the hose surface. This parameter change in material properties allows the roller to apply sufficient squeezing force for effective pumping while distributing the stress over a larger area and reducing peak stresses that would otherwise damage the hose and reduce its lifespan.
Solution Approach 2:
The roller uses composite materials combining hardness for structural integrity with a compliant outer layer that provides gentle contact with the hose. This allows the roller to maintain its shape and apply consistent squeezing force while the compliant layer protects the hose from excessive stress and extends tubing life.
4Duration of action of stationary object
If friction between hose and roller is reduced, then tube lifetime is extended, but pumping force is reduced
Solution Approach 1:
The roller material is selected with specific friction characteristics that provide adequate grip on the hose for effective pumping while not being so high-friction as to cause excessive wear. The material parameters are optimized to achieve the right balance between sufficient friction for pumping action and limited friction to protect the hose.
Solution Approach 2:
The roller uses a composite structure where the outer layer has controlled friction properties. This layer provides enough friction to effectively advance the hose and generate pumping action, while its material properties (such as PTFE or other low-wear materials) ensure that the friction remains within limits that protect the hose from premature failure.
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 design achieves a longer tube lifetime, precise metering, reduced power consumption, and easier temperature management, eliminating the need for external components like pulsation dampers and reducing mechanical friction, resulting in a more efficient and cost-effective pumping solution.
Implementation Method 1
friction between hose and roller is one of the factors that reduce lifetime of hose during operation
Implementation Method 2
Peristaltic pumps operate by squeezing elastic tubing in one direction. The repeated discharge and vacuum of the fluid to be transferred moves the fluid.
Implementation Method 3
Back pressure is generated in the area where two tubes are pinched by rollers. This is the problem of pulsation that can damage fittings, piping and other system components connected at the output line.
Data Source
AI summary
A dual-head, pulseless peristaltic-type pump comprises a pump housing, cover, two compressible tube chambers and two sets of rotatable occluding members. An off-center drive axis driven by motor or other rotational mechanism rotate inner large diameter disk. Balls or rollers between inner disk rotate in one direction from center drive axis where the outer ring is stationary and occludes the tube by linear motion without friction between tube and outer ring. The linear roller occluding motion transfers liquid or slurry from inlet to outlet of tube. In one embodiment, two separate sets of occluding members are installed 180 degree opposite to each other such that pulsations are compensated for and canceled out.