Screws, Pump

About Screw Pumps

About Screw Pumps

Screw pumps are rotary, positive displacement pumps that can have one or more screws to transfer high or low viscosity fluids along an axis. A classic example of screw pumps is the Archimedes screw pump that is still used in irrigation and agricultural applications.

Although progressive cavity pumps can be referred to as a single screw pumps, typically screw pumps have two or more intermeshing screws rotating axially clockwise or counterclockwise. Each screw thread is matched to carry a specific volume of fluid. Like gear pumps, screw pumps may include a stationary screw with a rotating screw or screws. Fluid is transferred through successive contact between the housing and the screw flights from one thread to the next. Geometries can vary. Screw pumps provide a specific volume with each cycle and can be dependable in metering applications.

The geometries of the single or multiple screws and the drive speed will affect the pumping action required. The capacity of screw pumps can be calculated based on the dimensions of the pump, the dimensions of the surface of the screws, and the rotational speed of the rotor since a specific volume is transferred with each revolution. In applications where multiple rotors are used, the load is divided between a number of rotating screws. The casing acts as the stator when two or more rotors are used. Based upon the needs of the application, timed or untimed rotors may be chosen. Untimed rotors are simpler in design.

The combination of factors relating to the drive speed, flow, and the characteristics of the fluid transferred may affect the flow rate and volume fed through each cavity. In water and wastewater treatment applications, a less viscous solution will require a lower power drive compared to untreated sewage, excess sludge, or concentrated slurries, which may require a higher power motor. The viscosity of the fluid transferred and the lift required may affect the speed and power required. Indicators of pump malfunction include decrease in flow rate or increased noise. The efficiency of screw pumps requires that each rotor turns at a rate that allows each cavity to fill completely in order to work at full capacity.

Related keywords: screw pump, lift spindle, pump screw twin, screw type pump, small screw pump, triple screw pump, eccentric screw pump, screw pump miniature, air lift pump type, screw pumps manufacturer, high accuracy hinge, 12 volt lift pump, miniature screw pump, screw pump manufacturer, triplex screw pump

Screw Pumps Directory

12 volt lift pump
12 volt lift pumps
accuracy positive displacement pump
accuracy positive displacement pumps
air lift pump
air lift pumps
air lift pump type
air lift pump types
air lift pumping
air lift pumpings
archimedean screw pump
archimedean screw pumps
archimedes screw pump
archimedes screw pumps
eccentric screw pump
eccentric screw pumps
grout pump screw type
helical pump
helical pumps
helical screw pump
helical screw pumps
high accuracy hinge
high accuracy hinges
high accuracy potentiometer
high accuracy potentiometers
high capacity and screw pump
high capacity and screw pumps
lift pump
lift pumps
lift spindle
lift spindles
manufacturer of screw pump
manufacturer of screw pumps
miniature screw pressure pump
miniature screw pressure pumps
miniature screw pump
miniature screw pumps
miniature screw type pump
miniature screw type pumps
pump lift
pump lifts
pump screw
pumps screw
pump screw twin
pump screw twins
pump screw type
pumps screw type
pump twin screw
pump twins screw
pump type screw
pumps type screw
screw pump
screw pumps
screw pump design
screw pump designs
screw pump manufacturer
screw pump manufacturers
screw pump miniature
screw pump miniatures
screw pump picture
screw pump pictures
screw pump twin
screw pump twins
screw pump type
screw pumps type
screw pumps manufacturer
screw pumps manufacturers
screw twin pump
screw twins pump
screw type pump
screw type pumps
sewer lift pump
sewer lift pumps
single screw pump
single screw pumps
small linear screw pump
small linear screw pumps
small screw pump
small screw pumps
spindle lift
spindles lift
triple screw pump
triple screw pumps
triplex screw pump
triplex screw pumps
twin pump screw
twins pump screw
twin screw pump
twin screw pumps
type pump screw
type pumps screw
type screw pump
type screw pumps

GlobalSpec.com