TABLE OF CONTENTS
Introduction to Gear Pumps
External Gear Pumps
Internal Gear Pumps
Pros and Cons
Application
Gear Pumps
Pump  Device used to move fluid
Gear Pump  Uses gears to move fluid
External
2 external gears
Internal
1 internal, 1 external gear
External Gear Pump
Fluid
in
Fluid
out
- Gears has close tolerances  Creates suction at inlet
- Fluid carried by gaps
- Fluid is forced out by the gear teeth
Internal Gear Pump
Fluid
out
Fluid
in
- Filling: Gears creates vacuum at inlet
- Transfer: Fluid flows clockwise in the spaces
- Delivery: Meshing of gears discharges fluid
Pros & Cons
Advantages
- Reversibility
- Self- primming
Disadvantages
- Fluids with solids suspended
- Wear and tear
Advantages
Disadvantages
- Viscous fluid
- Repairability
- More expensive
- Not self-primming
Application
External Gear Pump
Internal Gear Pump
- Chemical mixing and blending
- Resins and polymers
- Acids and caustic
- Asphalt, bitumen, and tar
- Industrial manufacturing
- Paint, inks, and pigments
- Fuel oils