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Internal External Gear Pump

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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  1. Internal External Gear Pump By Andrew McKinney

  2. External Gear Pump Internal Gear Pump Objective: Compare the two pumps

  3. 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)

  4. 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 • $$$

  5. Materials • Metals of various types and hardness through to plastics of various types and hardness • Metal allow for high temperatures and aggressive products

  6. 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

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