Screw pumps, due to the peculiarities of their design and a wide range of materials from which this type of pumping equipment is manufactured, are designed for fast and efficient pumping of liquid media of varying degrees of density, viscosity, contamination, aggressiveness and toxicity, which makes these units in great demand in many industrial and domestic areas listed below:
construction industry: pumping roofing, concrete, cement mortars, mixtures for self-leveling floors, lime, etc;
Pulp and paper industry: glue, pulp, bleaching compounds, etc;
Oil refining industry: pumping crude oil, oil fractions, fuel oil, paraffin, oil waste and other materials with lubricating properties;
chemical industry: pumping aggressive and toxic viscous media, including those contaminated with solid particles – corrosive mixtures, acid and alkaline mixtures, isocyanates, polymer solutions, etc;
Pharmaceutical industry: pumping liquid dosage forms of various viscosities.
Design of screw pumps
A screw (screw) pump is a volumetric self-priming unit in which the pressure of the pumped media is created by displacing them with the help of rotors (screws) made of metal, rotating inside a stator made of elastomer. The rotation of the rotors creates areas that alternately open and close and move along the axis of the screw. The pumping process is carried out by moving the liquid along this axis. Due to the enclosed space, there is no possibility of reverse movement of the pumped working medium.
Screw pumps are divided into three types, depending on the design features and the number of screws (augers) they are equipped with – single-screw, screw and three-screw, as well as single-stage and multi-stage. If you are faced with the task of buying screw pumping equipment, you should remember that the number of stages determines the type of working fluid that will be pumped with the greatest efficiency and with the least wear and tear. The difference between single-stage and multi-stage pumps is that the second type of units are equipped with a number of screw turns located on the shaft with a gradually decreasing pitch. Each turn is equipped with radial guides for the flow of the pumped media.
Advantages of screw pumps over other types of pumps
Before you buy a screw pump, we recommend that you carefully familiarize yourself with the main advantages and disadvantages of this type of equipment compared to other types of pumps. Advantages:
compactness, mobility, and efficiency;
high efficiency when pumping viscous media;
self-priming ability of the screw pump (suction depth – up to 8-8.5 m);
the possibility of using screw pumps for liquid volumes of up to 300 m3/h, pressure – up to 30 bar;
the ability to pump liquid, viscous and thick media with solid and gas inclusions without the risk of damage to the pump;
the ability to pump media in a stable, steady flow rather than pulsating due to the constant area of the cavity between the stator and rotor;
the presence of only one moving part in the design of the screw pump, as well as the absence of valves and other elements that affect the performance of the unit;
preservation of the original structure of the medium during its pumping due to the absence of a pulsating flow regime;
the ability to pump two-phase media without damaging solid inclusions;
Easy adjustment of the screw unit’s operating parameters;
high pressure with small dimensions;
simplicity of design, which guarantees ease of installation, operation, maintenance and repair;
optimally balanced design of the screw pump, which ensures its quiet operation and minimal vibration.
Disadvantages of screw pumps
The disadvantages of screw pumps are few, but nevertheless, when choosing the right pumping equipment, they should always be kept in mind:
lack of possibility to adjust the working volume of the liquid medium;
no possibility of idling;
The maximum heating temperature of the stator is 150 °C, as it is made of an elastomer that is prone to melting at higher temperatures;
increased friction of parts and, as a result, increased wear resistance;
insufficient cooling function;
rather expensive equipment.
Screw pumps from Dalgakiran Company
“Dalgakiran Compressor Ukraine offers screw pumps manufactured by BELLIN S.P.A., one of the world’s leading companies specializing in the production of screw and cam pumps since 1950.
0800 30 13 77
0800 30 13 77
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