When the screw vacuum pump is used to pump sludge and other media containing solid particles, the pressure of the screw pump is relatively large, generally reaching 0.6mpa-1.2mpa.
The screw vacuum pump is a kind of positive displacement pump with internal engagement and eccentric rotation. The main components of the pump are: a single screw rotor and a stator with double screw, which is usually made of elastic materials. When the rotor rotates around the axis of the stator in the cavity, the closed wrist formed between the rotating stators will move along the rotor's spiral line. Therefore, the medium will be continuously and uniformly And the volume is constant from the suction to the discharge. Based on this feature, the screw pump is particularly suitable for the following working conditions.
High viscosity medium delivered by screw pump: medium with viscosity of 37000-200000 MPA can be delivered according to different pump sizes.
Medium containing particles or fibers: the particle diameter can be 30mm (not more than the eccentricity of rotor). The fiber length can be 350mm (equivalent to the pitch of 0.4-position rotor). Its content is generally up to 40% of the medium cellar. If the solid in the medium is fine powder, the highest content can reach 60% or higher. When it is required that the conveying pressure is stable and the inherent structure of the medium is not damaged, the screw pump is the best choice for conveying.
Screw vacuum pump is widely used in wastewater treatment plant to transport water, wet sludge and flocculant liquid because of its variable transportation, strong self-priming ability, reversibility and ability to transport liquid containing solid particles. The selection of screw pump should follow the principle of economy, rationality and reliability. If the design and selection are not considered carefully, it will bring trouble to the later use, management and maintenance. Therefore, choosing a reasonable and reliable screw pump according to the actual production needs can not only ensure the smooth production, but also reduce the repair cost.
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