nestekierrepumppu

A nestekierrepumppu, also known as a progressive cavity pump or eccentric screw pump, is a type of positive displacement pump. It is characterized by its ability to handle viscous fluids, shear-sensitive materials, and fluids containing solids. The fundamental principle of operation involves a helical rotor rotating eccentrically within a stator, which also has a helical profile but with a different pitch and number of lobes. This synchronized rotation creates sealed cavities that move axially along the pump. As the rotor turns, these cavities are filled with the fluid at the suction port and then conveyed to the discharge port.

The design of a nestekierrepumppu allows for a relatively constant flow rate that is independent of the discharge pressure. This makes them suitable for applications requiring precise dosing or consistent delivery. The slow-moving rotor and stator minimize shear forces, which is beneficial for pumping delicate substances like food products, pharmaceuticals, or biological samples. Furthermore, the pumps are capable of achieving high pressures and can self-prime, meaning they can draw fluid from a level below the pump.

Common applications for nestekierrepumppuja include the transfer of sludge and wastewater in sewage treatment plants, pumping of food ingredients such as dough and chocolate, and the application of adhesives and sealants in manufacturing. They are also used in the oil and gas industry for enhanced oil recovery and in chemical processing for handling abrasive or corrosive materials. The materials of construction for the rotor and stator can be varied to suit the specific fluid being pumped, ensuring durability and chemical compatibility.