Fluid Power Systems-overview
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Transcript of Fluid Power Systems-overview
Fluid power systems-overview
MEE346
L T P C
3 0 0 3
History of fluid power systems
First hydraulic pump :Double pump delivering a fluid flow rate of
10 lpm;Piping network :100,000 km( 2.5 times
around the earth)Continuous operation: almost maintenance
freeCan you guess which is that pump?
History
Human blood circulatory system
Age 50: Hearts of 10 men should have pumped a volume of blood equal to that of the Great Egyptian Pyramid( how much?)
Evolution of fluid power( Oil hydraulics first and then pneumatics)
Blaise Pascal-1647” Law of hydrostatics”Bernoulli’s book-Hydrodynamics=>kinetic
theory of gases,jet propulsion,law of conservation of energy-1738
Mid 19th century,fluid power important in industrial and civil sectors eg: England,many cities had central hydraulic distribution systems with pumps driven by
……….?
History…
London Hydraulic Power company used fluid power ( hydraulics) for dock cranes and bridges to lifts in private house holds in Kensington and Mayfair
1930s -12m3 / min average hydraulic flow was used to lower or lift anything.Water was pumped beneath the streets of London for the above.
History…
Benjamin’s Franklin discovery of electricity changed everything.More and more electric power was used for material handling.
1925 Harry Vickers developed a vane type pump.Thence onwards hydraulic power became to be used in industry till today.
Power
Mechanical Power
Power
Power….
Power
Fork lift
Mechanical Parameters
Advantages of oil hydraulics
High power-weight ratio( minus power pack)
Self lubrication,No saturation phenomenon,high force to mass and torque to inertia ratios,high stiffness,high acceleration,high reponse,high stiffness of cylinders,protection against overloading simple,high energy storage,transmission flexibility( better than mech)
DISadvantages..con
Hydraulic power not readily avaialble,High costs,high inertia of transmission lines,temperature limits,fire hazard( mineral oils),Oil filtration .
Symbols-basic
Questions
What is a fluid power system?
Describe the function of power systems.
State the advantages/disadvantages of hydraulic and pneumatic power systems.
What are the symbols used in fluid power systems and why are they used?