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BACKGROUND
The gear pump is a rotary pump which provides the pumping action through the meshing of gears. The pumping action is done through the transferring and metering of liquids, and it is also used for the power transfer from the suction chamber to the impulse chamber. The fluid transfer takes place through the casing interior in the pockets via the meshing of gears to pump fluid from the suction side to the discharge under pressure. Gear pump can produce a high frequency which in return increases the flow rate ripples fluctuation of delivery in both of suction and impulse chambers.1
These gear pumps can work on high differential pressures in a way that the outlet side pressure is higher than the inlet pressure. However, there are certain clearances which allow the movement of the dynamic seal parts, and it also permits fluid to slip back and reduce its efficiency. The main components of the gear pump are the casing, gear wheel, and the suction and delivery pipe.2 Casing makes contact between the liquid to be transferred and the gear wheel. The intermeshing of two identical gears takes place in gear wheel pump in which one of them is connected to the driving shaft while the other one revolves due to the driving shaft. The suction pipes are circular shaped which connects the gear to suction and delivery.
The sole purpose of this experiment is to study the performance of the gear pump.
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REQUIREMENTS
Materials: Gear Oil Pump Test Rig
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PROCEDURE
First of all, fill about 75 % of the reservoir tank capacity with any of standard oil, such as SAE 40. Now, with the partial opening of the delivery pump, start the pump set. After this, adjust the head of the pump with the help of delivery valve. Now, record the time taken while collecting ten c.c of oil, and also note down the readings of energy meter for calculating the discharge and input power respectively. Repeat all of the above steps with changing the head, and ensure to keep the maximum head to kgf/ cm2 at normal working speed. Now, after closing the discharge valve and pressure gauge, switch off the motor pump.
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CONCLUSION
The study on the performance of the gear pump has been discussed.total head, discharge vs. power input, and the discharge vs. efficiency can be plotted on graph paper.
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REFERENCES
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J. W. R. Castilla, “Analysis of the turbulence in the suction chamber of an external gear pump using Time Resolved Particle Image Velocimetry,” Flow Measurement and Instrumentation, vol. 19, no. 6, pp. 377-384, 2008.
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K. I. F. G. T. K Nagamura, “Design and performance of gear pumps with a non-involute tooth profile,” Journal of Engineering manufacture, vol. 35, no. 2, pp. 35-60, 2004.
