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What are different types of hydraulic pumps. Explain external gear pump with a neat diagram.
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HYDRAULIC PUMP

  • The function of pump is to convert mechanical energy into hydraulic energy. >It is heart of any hydraulic system because it generates the force necessary to move the load.

  • Mechanical energy delivered to the pump using prime mover such as an electric motor.

CLASSIFICATION OF HYDRAULIC PUMP

Classified into two categories:

  1. Positive Displacement Pump
  2. Gear Pumps
  3. Vane Pumps
  4. Piston Pumps

2.Non-Positive Displacement Pump

  • Centrifugal or Impeller Pump

  • Axial Propeller Pump


External Gear Pump

Fig. shows an external gear pump.

  • It consists of two spur or helical gears, which are meshed with each other and mounted inside the casing.

  • One is driver and other is driven.

  • When the driver is rotated by means of any prime mover (i.e. electrical motor), driven will also rotate.

  • Thus partial vacuum is created at the inlet of the pump.

  • Oil is forced to enter the pump by atmospheric pressure.

  • Oil is trapped in the pockets between teeth and the casing and carried towards the outlet port.


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