The working principle of screw pump

Screw pump is a positive displacement rotor pump, it depend on is formed by the screw and the bushing to the change of volume of the sealed cavity suction and discharge of the liquid. Screw pump according to the number of screw is divided into single screw pump, double, three and five screw pump. The characteristics of screw pump is a smooth flow, little pressure pulsation, self-priming ability, low noise, high efficiency, long life and reliable operation; And its outstanding advantage is medium without formation of eddy current, is not sensitive to medium viscosity, can transport high viscosity medium.

The basic principle of work:

1. The screw pump is the use of screw rotary to absorb liquid. Figure said in three sections of screw pump. Diagram, screw to active screw center, by the prime mover, on both sides of the screw is driven screw, with the active screw do reverse rotation. Driving screw driven screw thread are based on double thread.

Due to the mutual engagement of each screw and screw and the close coordination of the liner wall, between the inlet and outlet of the pump, can be divided into one or more of the sealed space. With the rotation of the screw and meshing, the sealed space in pump suction side form unceasingly, the liquid from the suction chamber seal in among them, and since the suction chamber along the screw axial continuously goes on to the discharge end, will be closed in the space of the liquid discharge, like a nut in screw rotation being constantly move forward, this is the basic work principle of screw pump.

2. The screw pump working principle is: screw pump, the liquid is sucked into the thread and surrounded by the pump shell after sealed space, when active screw rotation, screw pump seal volume under the extrusion of screw tooth screw pump pressure, and along the axial movement. Because the screw is constant speed rotation, so the liquid flow is uniform.

Screw pump characteristic is: the loss of the screw pump is small, good economic performance. High pressure and uniform, uniform flow, high rotating speed, and prime mover straight league.

Screw pump can be transported conveying lubricating oil, fuel oil, conveying various oil and polymer, used for conveying viscous liquid.

Transport high viscosity medium: 3. Depending on the size of the pump can transport medium viscosity from cp.

Medium containing particles or fibers: grain diameter can this 30 mm (no more than the rotor eccentricity). Fibre length can be 350 mm (0.4 quite a bit of rotor pitch). Its content can be up to 40% of the medium cellar general solid if the medium is the fine powder shape, the highest content of 60% or higher can also transport.

Require delivery pressure stability, the inherent structure of medium are not destroyed, choose the single screw pump delivery is most ideal.