Screw pump and variable delivery self-priming ability, but also can be reversed, the characteristics, transport the liquid containing solid particles, etc. Therefore, it is widely used in sewage treatment plant. The screw pump is at least a meshing screw, which can rotate in the casing, suction, exhaust the hydraulic pump at the same time, the volume of the pump screw pump can also use the screw rotating studio changes periodically.

There are many types of screw pump, screw according to the number of points, which can be divided into single screw pump, double screw pump and the three screw pump, when the active screw rotation, driven screw meshing will follow to rotate together, then, the meshing space at one end of the suction chamber volume will be gradually increased, at the same time. The pressure will be lower in the role of pressure difference, the liquid will enter into the mesh space volume, then the volume increase in liquid product to form a sealed cavity, in a sealed cavity continuously along the axial direction, until the end of the discharge chamber, the liquid will be discharged with gradually narrowing the meshing discharge space volume one end of the cavity.

The pump can replace other advantages:

1, smooth flow pulsation free flow is proportional to the speed, with the metrological characteristics;

2, low shear;

3, good self-priming performance;

4, adapted from very low to very high viscosity;

5, compatible with high solids content, including particle conditions

The disadvantages are also obvious, in order to make good use of knowledge:

1, because of the large friction between the stator and rotor, the need for greater torque. Efficiency is low, often shaft Absorption Power 1KW, manufacturers will be equipped with 3KW or even larger motor

2, more prone to dry grinding, high temperature, damage to rubber and other materials of the stator, stator and sealing parts are consumables

3, often slender, need larger installation space