Hammaspyöräpumpussa

Hammaspyöräpumppu, or gear pump in English, is a type of positive displacement pump that utilizes the meshing action of gears to transfer fluid. There are two primary types: external gear pumps and internal gear pumps.

External gear pumps consist of two meshing gears, one driving and one driven, housed within a casing. As the gears rotate, they create expanding cavities on the inlet side, drawing fluid into the pump. The fluid is then trapped between the teeth and the casing and carried around to the outlet side, where the meshing of the teeth reduces the volume, forcing the fluid out under pressure.

Internal gear pumps feature a smaller gear rotating inside a larger, internally toothed ring gear. A crescent-shaped divider separates the two gears. Similar to external gear pumps, rotation creates expanding spaces on the inlet side, drawing in fluid. This fluid is then carried around the periphery of the gears and discharged under pressure as the meshing occurs on the opposite side.

Gear pumps are widely used in various applications due to their simplicity, robustness, and ability to handle a wide range of fluid viscosities. They are commonly found in hydraulic systems, lubrication systems, fuel transfer, and chemical processing. Their flow rate is generally proportional to their speed, and they can generate high pressures. However, they can be sensitive to abrasive particles in the fluid.