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NISER SEMINAR
GEARED CENTRIFUGEGEARED CENTRIFUGEVED PRAKASH
NISER
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INTRODUCTION
● One of the first projects at NISER.● Talk will consist of the following topics :
– Introduction { trailor }● Aims & expectations.● Advantages over commercial centrifuge● Brief discussion about its working, Innovative ideas &
current status.
– Design & brief discussion about the spares.
– Story behind.
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Main aims...
● To create a cost effective centrifuge having NISER logo on it.
● To study the behavior of various materials at high RPM.
● To get exposure towards the technical aspects of the machines.
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How does it look ???
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Why this project is special ???
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Compare the two.....
●Commercial● RPM = 18,000 .
● PRICE = Rs 1.7 LAKH
● Similar to Windows
●NISER made● RPM = 30,000 & even
more with greater control.
● PRICE = Less than Rs. 50,000
● Similar to LINUX.
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How does it work ???file:///media/RR%20UJJWAL/SCHEMATIC.png
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Current Status of project
● Project has been successfully completed up to about 60%.
● Stage 1 – gear system + framework [completed]
● Stage 2 – platform [blue-print completely prepared]
● Cooling system – 1/20 complete.
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Personal inventions
● Cooling system.● Vibration reduction by “ fluid coupler ” .
[this part is generally not found in commercial centrifuges]
● Low cost Speed indicator.
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END OF THE TRAILOR....
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PARTS OF THE CENTRIFUGE
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THE MOTOR
● Rating – 1 Hp , 3000 RPM
● PROVIDES THE DRIVING POWER
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The gear box
● Provides RPM multiplication of range :– 4th gear – 1 : 4
– 3rd Gear – 1 : 6
– 2nd Gear – 1 : 8.5
– 1st Gear – 1 : 12
● Provides speed control.● Clutch system provides smooth transmission of
power.
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file:///media/RR%20UJJWAL/30-06-08_2129.jpg
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Modifications brought in the engine
● Piston, cylinder , crank, dynamo, carburetor, kick were removed.
● Crank was replaced by specially made SS shaft.
● Many holes were made in the gearbox for the circulatory system.
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THE FLUID COUPLERfile:///media/RR%20UJJWAL/coupler.png
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Its Position in centrifuge
● Works on the principle of viscosity.
● Transmits only RPM & no vibrations.
● Latex is used because :– Sticky
– Inert
– Viscous & stable.
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The platformfile:///media/RR%20UJJWAL/platform.png
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The cooling systemfile:///media/RR%20UJJWAL/platform.png
file:///media/RR%20UJJWAL/SCHEMATIC.png
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The HEART of the machine...
● It is a small centrifugal pump designed typically for pumping gear oil.
● It is the HEART of oil cooling system.● It circulates gear oil through the radiator & the
gearbox.● It also supplies gear oil to the dry regions of
gearbox.
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RPM METER
● Based on simple principle of EMI in a dynamo.
● The amount of voltage developed by dynamo can be used to estimate RPM.
● Cost Rs. 150.
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INNOVATIVE IDEAS
● USE OF DISC BRAKE● SPECIAL RUBBER BUSHES.● RPM METER● CENTRAL PUMP & COOLING SYSTEM● VIBRATION REDUCTION BY FLUID
COUPLER.
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RUBBER BUSHES
● Slipper pieces have been used in place of rubber bushes for mounting the gearbox & motor.
● Advantage – cheap & easily available.
● Also , they have high tensile strength & are long lasting.
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THE STORY BEHIND.....
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THE MOTOR ARRIVED 1 MONTH LATER.....!!!
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15 SEP. ... THE TEST DAY..
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BAD LUCK....
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THE FINAL TEST DAY....
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FINALLY.. ON 1 OCT.....
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ACKNOWLEDGEMENT
● I would like to thank :– IOP for providing the workshop facilities
– NISER for monetary support.
– My father & Mr. Badal (technical support).
– Mr. Srichandan (guide), Mr. R.R.Ujjwal (project partner).
– The people at workshop.
– Special thanks to all the NISER students & faculty for their support.
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THANK YOU....