Single screw pump is a kind of internal meshing hermetic screw pump, rotor type positive displacement pump, the main working parts by stator and has a double helix cavity in stator hole mesh with single head screw pump rotor, when the input shaft through the universal joint drive rotor, stator as a planet revolving around the stator, rotor continuous mesh form a sealed cavity, the seal chamber volume invariably do uniform axial movement, input medium flows through the stator - zhuang zi from the suction end to pay to the end, the input medium sealed cavity through the stator without stirring and destruction. Therefore, can deliver a hard wear sexual impurity and the solid particles of the medium and sticky liquid.
Single screw pump selection steps
According to the structure type can be divided into single screw pump
EH, G series basic horizontal pump is applicable to all kinds of industrial fields
EL series straight league type horizontal pump shaft between compact size save installation space
ER series spiral propulsion horizontal pump is suitable for transporting high viscosity medium illiquid
ES GS series fast cleaning type horizontal pump is suitable for food and pharmaceutical industries
EU series vertical pump pump through a pool of flange installed directly in the medium or container transportation
A submerged in the medium
A according to the characteristics of the medium and the actual installation requirements determine the right type of pump
To determine the pump speed
Speed range of the single screw pump in 100 ~ 600 r/min, small specifications of the pump license more than 600 r/min when the specifications of the pump when the greater the speed persons to be lower
Such as water treatment engineering of sewage sludge pump optimal speed range of 200 ~ 300 (r/min)
To determine the pump model and motor
According to certain speed range in the performance table query to determine the specifications of the pump and motor model according to the medium characteristics choose suitable material combination and the type of the shaft sealing system
Four checking pump inhalation can
Suction line device of NPSH NPSHa provide pump NPSH required by the user NPSHr related to the rotational speed of the pump and transport medium viscosity may consult factory for pump NPSHr curve obtained if NPSHa >
If NPSHr shows that meet the requirements of the suction NPSHa < NPSHr show that can not meet the requirement of the suction, the need to choose the specifications of the pump and rotating speed general advice to choose larger specifications of the pump and low speed
Five query unit size or special manufacturer for the unit installation drawing performance curve of pump, etc
Six motor show
1. The single screw pump preferable geared motor small specifications of the pump can also be six or eight pole motor
2. The Marine pump or the restricted space can choose backpack belt when slowing down
3. The flow can be used when need to adjust the MB jib planetary stepless motor pulley gear motor stepless speed regulation
YCT electromagnetic speed regulating motor or frequency control of motor speed, etc
Seven other special requirements
1. According to the need to provide proof of dry running device bypass circulation valve device
2. If you need to heating/cooling medium can provide with jacketed suction pipe, please consult factory