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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