Screw pumps, also known as screw pumps or progressing cavity pumps, are a type of positive displacement pump. They are designed to transfer fluids of varying viscosity, slurries, chemicals and even shear-sensitive materials. Here is information about the usefulness, functioning and types of screw pumps:
Utility:
Viscous Fluid Transfer:
They are widely used to transfer viscous fluids, such as polymers, pulps, sludges, oils and high viscosity chemicals.
Industrial Applications:
They find application in industries such as petrochemicals, water and effluent treatment, food and beverages, paper and cellulose, among others.
Handling Sensitive Materials:
They can be used to pump materials sensitive to shear, as they operate smoothly and with low shear.
Operation:
Positive Displacement Principle:
Screw pumps belong to the category of positive displacement pumps, which means they deliver a fixed amount of fluid per cycle or rotation.
Rotor and Stator Configuration:
They consist of a helical rotor that rotates inside a corresponding stator with a helical cavity. The geometry of these propellers is what creates a pumping action.
Cavity Formation:
As the rotor rotates, it creates cavities between the rotor blades and the stator walls. These cavities move axially, forcing fluid to be transferred along the pump axis.
Progressive Shift:
The progressive displacement of the cavities is what contributes to the smooth and consistent pumping of viscous fluids.
Flux control:
Flux control is achieved by varying the rotational speed of the rotor or by adjusting the geometric characteristics of the rotor and stator.
Common Types of Screw Pumps:
Standard Helical Pump:
Basic configuration with helical rotor and stator, suitable for a variety of viscous fluids.
Progressive Cavity Helical Pump:
Designed to offer a continuous and uniform flow, especially in highly viscous fluids.
Double Stage Progressive Cavity Helical Pump:
It has two cavity stages for greater efficiency in transferring viscous fluids.
Double Screw Progressive Cavity Helical Pump:
Uses two helical rotors instead of one, providing greater pumping capacity and efficiency.
Three Screw Progressive Cavity Helical Pump:
It integrates three helical rotors for even more pumping capacity.
Four Screw Progressive Cavity Helical Pump:
Incorporates four helical rotors to meet significant viscous fluid transfer demands.
The choice of the type of screw pump will depend on the specific characteristics of the fluid to be transferred, the operating conditions and the flow and pressure needs. These pumps are known for their ability to efficiently handle viscous fluids, offering an effective solution in various industrial applications. |
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