Technical Analysis of Progressive Cavity Pumps

1. Core Working Principle

The progressive cavity pump achieves fluid transfer through helical sealing chambers formed between a metal rotor and elastic stator. As the motor drives the rotor in planetary motion, sealed cavities axially progress to enable pulsation-free flow delivery with theoretical flow accuracy of ±1%.

Fundamental formula:
Q = 4×e×D×T×n
(Q=Flow rate; e=Eccentricity; D=Rotor diameter; T=Stator pitch; n=Rotational speed)

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3.Industrial Performance Data

-------------------------------------------------------------------------------------------- Application Medium Properties Flow(m³/h) Service Life(h) -------------------------------------------------------------------------------------------- Heavy Oil Transfer Viscosity 12,000cSt 35.6 8,000+ -------------------------------------------------------------------------------------------- Municipal Sludge Solid Content 45% 18.2 6,500 -------------------------------------------------------------------------------------------- Food-grade Jam Shear-sensitive Non-Newtonian 9.8 10,000 --------------------------------------------------------------------------------------------

4. Selection Methodology

Viscosity Curve: Recommended for media >500cSt NPSH Optimization: Double suction design reduces NPSHr by 40% Efficiency Formula: η=0.92-0.0003μ (μ=Dynamic viscosity in Pa·s)

Details

Sha Cheng Jie, Long Wan Qu, Wen Zhou Shi, Zhe Jiang Sheng, China

ZHEJIANG XINGSHENG MACHINERY CO.,LTD

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