Screw pump is divided into single screw pump, twin screw pump, three screw pump. This article describes in detail their structure, characteristics, performance parameters, the difference between the four aspects of the application, as well as their advantages and disadvantages. Such as single-screw pump structure for the single-headed male screw rotors in a special double-headed female screw rotors eccentric (stator is soft), can swing back and forth along the pump center line with the stator always maintain engagement, twin screw pump structure There are two screw shafts of the same size, one is a driving shaft, one is a driven shaft, and a synchronous rotation is achieved through gear transmission.
Single screw pump
structure:
The single-headed male screw rotor rotates eccentrically within a special double-headed female screw stator (the stator is soft), swings back and forth along the centerline of the pump and remains engaged with the stator Features:
1 , can transport liquid containing solid particles
2 , almost any viscosity of the fluid, especially for high viscosity and non-Newtonian fluid
3, the working temperature is limited by the stator material
Performance parameters:
Flow up to 150m³ / h, pressure up to 20MPa
Application:
For molasses, pulp, starch paste, chocolate pulp, paint, tar, paraffin, grease, mud, clay, clay, etc.
Twin screw pump:
structure:
There are two the same size of the screw shaft, a drive shaft, a driven shaft, through the gear drive to achieve synchronous rotation Features:
1 , Screw and pump body, as well as between the screw to maintain 0.05 ~ 0.15mm gap, wear small, long life
2 , stuffing box only by the suction pressure less leakage
3, compared with the
three screw pump , not sensitive to impurities Performance parameters:
The pressure is generally about 1.4 MPa , for viscous liquids up to 7 MPa , liquids with low viscosity up to 3 MPa , flow rates of 6 to 600 m³ / h and maximum of 1600 m³ / h
Liquid viscosity can not exceed 1500mm² / s
Application:
For lubricating oil, grease, crude oil, asphalt, fuel oil and other high viscosity oil
Three screw pump structure: consists of an active screw and two driven screw with the following features:
1 , the active screw directly driven driven screw, no gear, simple structure
2 , the pump itself as a screw bearing, no need to install radial bearings
3 , the screw does not withstand the bending load, can be made very long, so high pressure can be obtained
4 , should not be transported with more than 600 μ m solid impurities in the liquid
5 , high-speed operation, is a small high-flow pump, high volumetric efficiency
6, stuffing box connected only with suction pressure, leakage less performance parameters:
Pressure up to 70 MPa , flow up to 2000m ³ / h . For the viscosity of 5 ~ 250 mm ² / s medium Applications:
Suitable for transporting lubricating oil, heavy oil, light oil and crude oil. Can also be used for glycerol and viscose and other highly viscous liquid delivery