Hydraulic Gear Pump


HYDRAULIC PUMPS

Hydraulic pumps convert the mechanical energy transmitted by its prime mover (electronic motor, internal combustion engine) into hydraulic working energy.
The type of pump used in an industrial hydraulic system is a positive displacement pump, there are many types of positive displacement pumps.
For this reason, we must be selective and concentrate on the most popular.These are vane, gear, and piston pumps.
So, now we need to know types of pump?

PUMP TYPES




Non positive displacement pumps:
Centrifugal pumps are used to pump large volumes of fluids at relatively low pressures. Like other non positive displacement pumps, they share the common advantages of low noise level, and the ability to pump nearly all fluids without damage to internal parts. Propeller pumps are also non positive displacement pumps.

Positive displacement pumps:
Positive displacement pumps transfer a constant amount of fluid for each cycle of operation. If this internal pump volume can not be adjusted, the pump is considered to have a fixed displacement. If the internal volume of the pump is adjustable, the pump is considered to be variable volume displacement pump. While the drive speed also can be used to change the volume flow rate for a positive displacement pump, this is a less desirable altrnative than varying the internal displacement to change pump output.

Positive displacement pumps are essentially four basic types:
1-Gear pumps (fixed displacement only by geometrical necessity):
· External gear pumps.
· Internal gear pumps.
· Lobe pumps.
· Gerotor.

2-Screw pumps (fixed displacement only).

3-Vane pumps:
· Unbalanced vane pumps (fixed or variable displacement).
· Balanced vane pumps (fixed displacement only).
4-Piston pumps (fixed or variable displacement):
· Axial flow.
· Radial flow.

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