What are the classification of pumps? _ The advantages of screw pumps

Screw pump is a new type of liquid transport machinery, with simple structure, safe and reliable operation, convenient maintenance, uniform flow of liquid, pressure stability and other advantages. The utility model relates to a pump that uses the rotation of a screw to suck and drain liquids, which is best suited to suck and drain viscous liquids. Screw pump is a single screw transport pump, its main operating parts are the screw (rotor) and the inner surface of the double helix screw bushing (stator). The working principle is that when the motor drives the pump shaft to roll, the screw rotates around its own axis on the one hand, and rolls along the inner surface of the bushing on the other hand, so as to form the advantages of the screw sealing chamber of the pump. Each time the screw turns, the liquid in the sealing chamber pushes forward a pitch, and with the continuous tumbling of the screw, the liquid spiral method is pressed from one sealing chamber to another sealing chamber, and finally extrudes the pump body.

From the above operating principles, it can be seen that the screw pump has the following advantages:

1; Pressure and flow scale is wide. The pressure is about 3.4-340 kg force /cm 2, and the flow rate can reach 18600cm3/ min.

2; A wide range of varieties and viscosities of liquids transported;

3; Because the inertia force of the reverse part in the pump is low, it can use a high speed;

4; Good absorption ability, with self-priming ability;

5; Uniform flow connection, small oscillation, low noise;

6; Compared with other reverse pumps, it is less sensitive to incoming gas and dirt;

7; Solid structure, simple device maintenance.

The defect of screw pump is that the processing and assembly requirements of screw are high; The performance of the pump is sensitive to changes in the viscosity of the liquid.

Key words: screw pump, screw pump advantages and disadvantages