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screw pump is a type of positive displacement pump that uses two or more intermeshing screws to move fluid from the inlet to the outlet. The screws rotate in opposite directions, creating a sealed cavity between the screw threads and the pump housing. As the screws rotate, the fluid is trapped in the cavities and is transported from the inlet to the outlet.
Screw pumps are used in a variety of applications, including the transfer of viscous or shear-sensitive fluids such as crude oil, sludge, and wastewater. They are also commonly used in the food and beverage industry, where they are used to transfer products such as chocolate, cream, and syrup.
Advantages of Screw Pumps
High Efficiency: Screw pumps are highly efficient and can transfer viscous fluids with minimal pulsation or shear. This makes them ideal for applications where product quality is critical.
Self-Priming: Screw pumps are self-priming, which means that they can automatically remove air from the suction line and begin pumping fluid without the need for external priming.
Versatility: Screw pumps can handle a wide range of fluids, including those with high solids content or those containing abrasive particles. They are also capable of handling high temperatures and pressures.
No Internal Metal-to-Metal Contact: The screws of the pump do not touch each other, which reduces wear and tear and eliminates the need for lubrication.
Types of Screw Pumps
Single Screw Pumps: Single screw pumps have one helical screw that rotates inside a stator. The screw displaces the fluid and creates a seal with the stator, which prevents the fluid from flowing back to the inlet.
Twin Screw Pumps: Twin screw pumps have two intermeshing screws that rotate inside a casing. The screws create a seal with the casing and each other, which traps the fluid in the cavities and moves it from the inlet to the outlet.
Three Screw Pumps: Three screw pumps have three screws that rotate inside a casing. The screws create a seal with the casing and each other, which traps the fluid in the cavities and moves it from the inlet to the outlet. Three screw pumps are typically used for high-pressure applications.
