Tilavuuspumppu

Tilavuuspumppu, often translated as positive displacement pump, is a mechanical device used to move fluids by trapping a fixed amount of fluid and forcing or displacing it into a lower pressure system. Unlike centrifugal pumps, which rely on kinetic energy to move fluids, positive displacement pumps deliver a consistent flow rate regardless of the discharge pressure. This makes them ideal for applications requiring precise metering or the pumping of viscous fluids.

There are two main categories of positive displacement pumps: rotary and reciprocating. Rotary pumps, such as gear pumps, screw pumps, and lobe pumps, use rotating elements to trap and move the fluid. Reciprocating pumps, like piston pumps and diaphragm pumps, utilize a back-and-forth motion of a piston or diaphragm to achieve the same result. The choice between these types depends on factors like the fluid's viscosity, the required flow rate, and the operating pressure.

The principle of operation for a positive displacement pump involves creating a seal around a specific volume of fluid. As the pump mechanism operates, this sealed volume is transported from an inlet to an outlet. The inherent sealing action ensures that a given amount of fluid is displaced with each cycle or rotation, leading to a predictable and often constant flow. This characteristic is crucial in many industrial processes, including chemical dosing, oil transfer, and hydraulic systems.