helical rotor positive displacement pump

A helical rotor positive displacement pump, also known as a progressive cavity pump or a helical screw pump, is a type of pump that operates using a unique helical rotor and stator design to move fluids through the pump's chamber. It falls under the category of positive displacement pumps, which means they move a fixed amount of fluid with each rotation of the pumping elements.
 
Here's how a helical rotor positive displacement pump works:

Rotor and Stator Design: The pump consists of a helical-shaped rotor (also called a screw) and a stator (a fixed, usually elastomeric tube or cavity). The rotor is a single-threaded, helix-shaped screw that fits inside the stator. The geometry of the rotor and stator creates cavities or spaces between them.

Fluid Flow: When the pump is in operation, the rotor rotates eccentrically within the stator, causing the cavities to progress along the screw's length. As the cavities move from the pump's inlet to its outlet, they gradually reduce in size, compressing the fluid within them.

Fluid Displacement: The reduction in cavity size causes the fluid to be displaced continuously from the pump's inlet to its outlet. As the rotor turns, each cavity carries a fixed amount of fluid, ensuring a consistent flow rate with every rotation.

Sealing Action: The helical rotor and stator design creates a sealing action that prevents the fluid from flowing back along the rotor's axis, providing an efficient pumping mechanism.

Helical rotor positive displacement pumps are known for their ability to handle various types of fluids, including viscous, abrasive, and shear-sensitive materials. They are commonly used in industries such as:

Oil and Gas: Helical rotor pumps are utilized for transferring crude oil, drilling mud, and various hydrocarbons.

Wastewater Treatment: These pumps are suitable for pumping sludge and other wastewater materials.

Food and Beverage: They are used in food processing for transferring viscous liquids, such as syrups, creams, and pastes.

Chemical Processing: Helical rotor pumps handle corrosive and abrasive chemicals in chemical processing plants.

Agriculture and Irrigation: They can be used for pumping water in agricultural irrigation systems.

One significant advantage of helical rotor positive displacement pumps is their ability to handle high-viscosity fluids without losing performance. However, they may not be as efficient for low-viscosity fluids compared to other types of pumps like centrifugal pumps. Additionally, these pumps require proper maintenance to ensure the longevity of the stator and rotor components.