Gear pumps

The simple gear pump consists of two spur gears meshing together and revolving in opposite directions within a casing. Any liquid that fills the space between the gear teeth and the case must follow along with the teeth as gear turn.

There are several types of gear pumps. The simple gear pump consists of two spur gears meshing together and revolving in opposite directions within a casing. Any liquid that fills the space between the gear teeth and the case must follow along with the teeth as gear turn. When the gear teeth mesh with the teeth of the other gear, the space between the teeth almost disappears, and the entrapped liquid is forced out the pump. As the gears revolve and the teeth disengage, the space again opens on the suction side of the pump, replenish new quantities of liquid and carrying it around the pump case. As the liquid is carried away from the suction side, a lower pressure is created, which draws liquid in through the suction line.
A large number of teeth on the gears ensures that the media flowing from the pump is homogenous without major pressure spikes. A gear pump with a small number of teeth provides a less homogenous flow, as there are fewer teeth to ensure an even flow. However, pump flow is higher, as the larger spaces between the teeth allow more media to be pumped.





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