The single screw pump is a volumetric pump with internal meshing eccentric rotation. The main components of the pump are a single-headed spiral rotor and a stator with a double-closed spiral usually made of elastic material. When the rotor is fixed in the cavity, the stator is wound around the stator. When the axis is rotated by the planet, the closed wrist formed between the rotating stators is displaced along the spiral of the rotor; therefore, the medium is continuously, evenly and continuously supplied from the suction port to the pressing end, based on this Features, single screw pump is especially suitable for the following working conditions.
Delivery of high viscosity media: media with a viscosity of from 37,000 to 200,000 centipoise can be delivered depending on the size of the single screw pump.
Media containing particles or fibers: The particle diameter can be 30 mm (not exceeding the rotor eccentricity). The fiber length can be 350mm (corresponding to the pitch of the 0.4 rotor). The content is generally up to 40% of the medium enthalpy. If the solid matter in the medium is a fine powder, the highest content can be as high as 60% or higher.
When the conveying pressure is required to be stable and the inherent structure of the medium is not detrimental, the single-screw pump is most ideal.
The selection of single-screw pump is based on the nature of the liquid to be delivered and the flow rate and pressure. The speed of the single-screw pump is selected by the viscosity and corrosivity of the liquid to be used as the main parameters. The pump operates reliably.
The design speed of the single-screw pump is the maximum speed allowed when conveying clean water or clean water-like non-corrosive liquid. In actual use, due to different media properties and life requirements, the selection should generally be lower than the design speed. For high viscosity and granular media, the design speed is generally 1/2-1/3 or lower. The low speed is beneficial to the wear of the pump, but after the use, the wear flow of the stator decreases, and the speed can be appropriately increased. To compensate for the decline in traffic is also a common policy.
The temperature of the medium transported by the single screw pump should be -10 °C ~ 80 °C in special cases up to 120 °C.
The normal pressure of each stage of the single screw pump (one lead of the stator) is .
0.6Mpa, up to 0.8Mpa is allowed in a short time (not more than 30 minutes), and the volumetric efficiency at the same output pressure is gradually reduced when worn.