PPT Slide
How an internal gear pump works
Functional Requirement and Design Parameter:
FR - Transfer Mechanical Power To Fluid Power
- One shaft is driven, causing both gears to rotate as shown
- Fluid flows into the inlet [low pressure side]
- Fluid is trapped between the housing and the gear teeth
- The fluid is transported around the outside of the gear to the outlet side
- The fluid exits the outlet port [high pressure side]
Since the gear teeth are engaged, fluid can not flow between them
- Pi = Power Input [Watts or hp]
- Po = Power Output [Watts or hp]
- T = Torque [Nm or in lbf]
- w = Input Shaft Speed [rad/s or RPM]
- hi = Efficiency of i [Unitless]
- D = Displacement [m3/rev or in3/rev] This is how much fluid it pushes through per revolution
- hm = Po/Pi Mechanical Efficiency