positive displacement: the peristaltic pump prepared by: -stephanie arbelovsky -andrea hektor...
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Positive Displacement: The Peristaltic
Pump
Prepared By:-Stephanie Arbelovsky
-Andrea Hektor-Christina
HynesDecember 17,
2004
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Project Goals:• Create a constant flow
device for a point-of-use water supply system in a developing community.
• Develop a system that was sustainable, affordable, and readily available.
• Experiment with various drive mechanisms, such as a clock, pendulum, and a weight system.
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Concept: Peristaltic Pumps
• Peristalsis – a natural process of involuntary wave-like successive muscular contractions by which food is moved through the digestive tract.
• Operates by batching a certain volume of water and forcing it along a tube.
• A rotor attached to an external circumference compresses and releases a flexible tube with rollers, creating a squeezing action that draws fluid through the tubing.
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Peristaltic Pump
• Positive Displacement Pump (PDP)
• 3 Parts– Pump Head– Drive Mechanism– Tubing
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Pump Head
• Masterflex® L/S Easy-load
• Worked only with Masterflex® tubing
• Torque required entirely dependent on tubing used
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Tubing• Masterflex®
Precision– Nontoxic– 275 degrees to -
75 degrees Fahrenheit
– Longer life
• Flow Rate• Torque
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Flow Rate
Size PulsesRotatio
ns VV/
rotationRotatio
n/
(ml) (ml) day
#18 180 60 238 3.967 5,042
#17 240 80 233 2.913 6,867
#16 480 160 144 0.900 22,222
#14 420 140 41 0.293 68,293
#13 777 259 16 0.062 323,750
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Torque
No. of Torque Torque
Size heads kg-cm oz-in
#18 1 8.6 120
#17 1 8.6 120
#16 1 3.2 45
#14 1 2.9 40
#13 1 1.4 20
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Clocks• Two Types:
– Electrical– Mechanical
• Weights• Springs
• Governed By Escapement Mechanism
• Why Not Have Gears Turn Pump Instead of Clock Hands?
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Giving it our best shot with
Tinker Toys!
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LEGO MAN!
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• To Make It Work:– Large gears 175 teeth,
medium gear 35 teeth, small gears 25 teeth
– Pendulum 107.5 cm long, with escapement mechanism on last gear•Period: 2.08 s
– 2 kg weight
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Do-It-Yourself Kits
• Woodworker Kit– Templates for gears
• Home Assembly Kits– Can buy pre-cut clock housing– Weight/pendulum sold separately
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Advantages• Able to vary flow
based on need– Can be scaled up &
down
• Does not require constant head loss
• Self priming• Prevents backflow• Inside of tube is
only area in contact with fluid– Low risk of
contamination
• Easy & convenient maintenance and cleanup
• Flexible staging options – can be placed after filter
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Disadvantages
• Preliminary design is expensive– Rotor, peristaltic
tubing, pendulum, etc.
• Durability concerns if cheaper, thin walled tubing is used
• Availability of materials
• Finding a drive mechanism with enough power to turn the rotor
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Recommendations for Further Research:
• Find a more practical pump head
• Use less expensive, flexible tubing
• Experiment with pendulum mechanisms in order to establish steady flow
• Evaluate flow rate compared to size and type of materials used
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References and Thank Yous
• "Plant Extracts." [Online] Available http://www.sciences.com/scidata/edu.html February 23, 1997.
• • “How Pendulum Clocks Work” [Online] Available
http://www.howstuffworks.com November 14, 2004.• • “Technical Info” [Online] Available http://www.masterflex.com December
2, 2004• • “Technical Info” [Online] Available http://www.barnant.com December 2,
2004• • White, Frank M. Fluid Mechanics. McGraw-Hill Science/Engineering/Math;
5th edition December 2002.• • Young, Donald F. ; Munson, Bruce R.; and Okiishi, Theodore H. A Brief
Introduction to Fluid Mechanics, 2nd Edition. John Wiley & Sons. October 2000.
• • CEE 454 website and class notes Available
http://ceeserver.cee.cornell.edu/mw24/cee454/ • www.clockplans.com• www.murrayclock.com• http://www.ericharshbarger.org/lego/clock.html
(A heart-felt thank you goes out to Lego Man for providing inspiration.