What Is A Screw Pump?
Due to its special geometry, Marine Screw Pump on the transmission of high viscosity fluid and containing hard suspended particle medium or fiber medium transmission, the general pump is not competent. Marine Screw Pump is classified into three types according to the quantity of screw, including Marine Single Screw Pump,Marine Double/Twin Screw Pump and Marine Three Screw Pump.There are different applications with different types of screw pump. Single screw pump referred to as universal pump, almost where the fluid can be selected, high viscosity medium is also at ease.
Twin screw pump can transport flow medium with fine particles, which it commonly used in chemical industry and shipyard.
Three screw pump mainly transfer lubricating medium without particles, which it has features containing high pressure and large flow
Overview
Working principle
The screw pump is a novel type of pump that operates based on the principle of rotary engagement displacement, with its main working components being an eccentric screw (rotor) and a fixed bushing (stator). By virtue of the unique geometry of the stator and rotor, it forms a separate sealed cavity, ensuring uniform axial flow of the medium. This design results in low internal flow velocity, constant volume, stable pressure, and eliminates vortex formation or agitation. The stator of the screw pump is fabricated from various elastic materials to accommodate high viscosity fluids, media containing hard suspended particles or fibers.
classification
Single screw pump - a pump in which a single screw engages and rotates in the internal screw groove of the pump body
Double screw pump - by two screws mesh with each other to transport the liquid pump
Three screw pump - by a number of screws mesh with each other to transport the liquid pump
structure
The screw pump consists of a stator, rotor, bearing, sealing device, motor and control device, reduction box and transmission device
Single screw pump structure
Twin screw pump structure
Three screw pump structure
Application
Lubricating oil pump, fuel pump,fire pump, etc
Material
1.stainless steel: with corrosion resistance, high temperature resistance, acid and alkali resistance, suitable for chemical, food and other industries. The disadvantage of stainless steel screw pumps is that the price is higher and higher quality stainless steel materials need to be selected when the liquid permeability is strong .
2. Cast iron: suitable for conveying a variety of low-viscosity non-corrosive liquids, widely used in agriculture, water supply and drainage, HVAC, pharmaceutical and petrochemical fields. The price of cast iron screw pump is relatively close to the people, but its corrosion resistance is poor, not suitable for transporting corrosive liquid .
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