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Internal External Gear Pump. By Andrew McKinney. External Gear Pump. Internal Gear Pump. Objective: Compare the two pumps. External Gear Pump. Been around since the beginning oil pump industry Used for high pressure applications (pulse free fluid flow)

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Internal External Gear Pump


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internal external gear pump

Internal External Gear Pump

By Andrew McKinney

external gear pump
External Gear Pump

Internal Gear Pump

Objective: Compare the two pumps

external gear pump1
External Gear Pump
  • Been around since the beginning oil pump industry
  • Used for high pressure applications (pulse free fluid flow)
  • Smaller - operate at 1 750 rpm or 3 450 rpm
  • Larger operate 640 rpm
  • Can handle viscous and water type liquids well
  • Thick liquids speed must be properly set (small meshing time)
  • True involute gear form (contour gear curved)
internal gear pump
Internal Gear Pump
  • Crescent pump
  • Less than 100 years old
  • Generally run at 1 150 rpm
  • Smaller ones run at 3 450 rpm (same as external)
  • Fairly long meshing time (allowing higher speeds with thicker fluids than external)
  • Not true involute gear form
  • $$$
materials
Materials
  • Metals of various types and hardness through to plastics of various types and hardness
  • Metal allow for high temperatures and aggressive products
stack up
Stack Up
  • Internal pump, more modern pump
  • Both have a pulse free fluid flow
  • External pump, cheaper
  • External pump has to run slower with thicker fluids
  • External involute form allows for less wear and tear
  • Internal pump handles abrasive and viscous fluids a lot better

References

  • http://www.pumpschool.com/principles/external.htm
  • http://www.appliedpumps.co.uk/Gear%20Pump%20Overview.htm
  • http://www.bin95.com/ebooks/pump_types_ebook.htm
  • http://www.pumpschool.com/intro/selection.htm