Hydraulic Pumps

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Hydraulic Pumps : 

Hydraulic Pumps Types & how they work Performance curves Presented By :- Shashank Mehta

Types : 

Types Non-Positive Displacement Fans Fluid couplers Positive Displacement Gear Vane* Piston* * Can be variable displacement, including pressure compensated and load sensing.

Slide 5: 

Impeller Mechanism Pump

Slide 6: 

Peristaltic Pump

Slide 7: 

Diaphragm Pump

Slide 8: 

Gear Pump

Slide 9: 

Gear Pump Balanced

Slide 10: 

Vane Pump

Slide 11: 

Piston Pump

Slide 12: 

Bent Axis Piston Pump

Slide 13: 

Swash Plate Piston Pump

Inefficiency : 

Inefficiency Leakage: you get less flow from a pump than 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

Slide 15: 

Speed Flow Qgpm = Dcu in/rev Nrpm /231

Slide 16: 

Pressure Rise Torque Required Tinlb = Dcu in/rev ∆Ppsi /(2π)

Efficiency : 

Efficiency Em – mechanical efficiency < 1 due to friction, flow resistance Ev – volumetric efficiency < 1 due to leakage Eo =overall efficiency = Em * Ev Eo = Power out/power in

References : 

References http://www.free-ed.net/free-ed/MechTech/hydraulics01/default.asp gear, vane, piston http://hydraulicspneumatics.com/200/FPE/IndexPage.aspx http://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

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