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Hydraulic Pumps
Types & how they work
Performance curves
Presented By :- Shashank Mehta
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Types
Non-Positive Displacement Fans
Fluid couplers Positive Displacement
Gear
Vane*
Piston*
* Can be variable displacement, including pressurecompensated and load sensing.
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Impeller Mechanism Pump
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Peristaltic Pump
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Diaphragm Pump
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Gear Pump
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Gear Pump Balanced
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Vane Pump
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Piston Pump
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Bent Axis Piston Pump
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Swash Plate Piston Pump
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Inefficiency
Leakage: you get less flow from a pumpthan simple theory suggests.
Increases with larger pressure difference
Friction: it takes some torque to turn a
pump even if there is no pressure rise Is more of a factor at low pressures
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Speed
Flow Theoretical pump
Effect of leakage
Qgpm = Dcu in/rev Nrpm /231
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Pressure Rise
Torque
Required Theoretical pump
Effect of friction
Tinlb = Dcu in/revPpsi /(2)
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Efficiency
Em mechanical efficiency < 1 due tofriction, flow resistance
Ev volumetric efficiency < 1 due toleakage
Eo =overall efficiency = Em * Ev Eo = Power out/power in
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Referenceshttp://www.free-ed.net/free-ed/MechTech/hydraulics01/default.asp
gear, vane, piston
http://hydraulicspneumatics.com/200/FPE/IndexPage.aspxhttp://www.animatedsoftware.com/pumpglos/pumpglos.htm
Impellar mechanism Peristaltic pump Diaphragm pump Gear pump Gear pump balanced Vane pump Piston pump
Bent axis piston pump Swashplate pump
http://home.wxs.nl/~brink494/frm_e.htm
http://www.pumpschool.com/principles/external.htm
http://www.pumpschool.com/principles/internal.htm
http://www.free-ed.net/free-ed/MechTech/hydraulics01/default.asphttp://hydraulicspneumatics.com/200/FPE/IndexPage.aspxhttp://www.animatedsoftware.com/pumpglos/pumpglos.htmhttp://home.wxs.nl/~brink494/frm_e.htmhttp://www.pumpschool.com/principles/external.htmhttp://www.pumpschool.com/principles/external.htmhttp://home.wxs.nl/~brink494/frm_e.htmhttp://www.animatedsoftware.com/pumpglos/pumpglos.htmhttp://hydraulicspneumatics.com/200/FPE/IndexPage.aspxhttp://www.free-ed.net/free-ed/MechTech/hydraulics01/default.asphttp://www.free-ed.net/free-ed/MechTech/hydraulics01/default.asphttp://www.free-ed.net/free-ed/MechTech/hydraulics01/default.asphttp://www.free-ed.net/free-ed/MechTech/hydraulics01/default.asphttp://www.free-ed.net/free-ed/MechTech/hydraulics01/default.asp