Screw pump (mechanical engineering terminology)


A screw pump is a positive displacement rotor pump that draws in and discharges liquid by means of a volume change of a sealed chamber formed by a screw and a bushing. The screw pump is divided into single screw pumps, double, triple and five screw pumps according to the number of screws. The screw pump is characterized by stable flow, small pressure pulsation, self-priming capability, low noise, high efficiency, long life and reliable operation. Its outstanding advantage is that it does not form eddy current when transporting the medium, and is not sensitive to the viscosity of the medium. Deliver high viscosity media.
The screw pump is a rotary pump that relies on the volume change and movement of the mesh space formed by the pump body and the screw to transport or pressurize the liquid. The screw pump is divided into a single screw pump, a twin screw pump and a three screw pump according to the number of screws. When the driving screw rotates, the driven screw that meshes with it is rotated together, and the screw meshing space volume at one end of the suction chamber is gradually increased, and the pressure is lowered. The liquid enters the volume of the meshing space under the pressure difference. When the volume is increased to a maximum to form a sealed chamber, the liquid is continuously moved axially within the sealed chambers until one end of the chamber. At this time, the screw meshing space volume at one end of the discharge chamber is gradually reduced, and the liquid is discharged. The working principle of the screw pump is similar to that of the gear pump, except that the gear is replaced by a screw in the structure. The table shows the characteristics and application range of various screw pumps. The screw pump has small flow and pressure pulses, low noise and vibration, and self-priming capability, but screw processing is difficult. The pump has a single suction type and a double suction type, but the single screw pump has only a single suction type. The pump must be equipped with a safety valve (the single-screw pump does not have to be equipped with a belt) to prevent damage to the pump or prime mover due to some reason such as clogging of the discharge pipe causing the pump outlet pressure to exceed the allowable value.


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