In the field of industrial fluid transportation, positive displacement pumps and centrifugal pumps, as two core devices, their technical differences directly determine the division of application scenarios. With over 40 years of technological accumulation, Tianjin Shuangjin Pump Machinery Co., Ltd. provides precise solutions for different working conditions through a differentiated product matrix of SNH series three-screw pumps and CZB type centrifugal pumps.
I. Essential Differences in Working Principles
The positive displacement pump (taking the SNH three-screw pump as an example) adopts the meshing volumetric conveying principle. Through the rotation of the screw, a closed cavity is formed to achieve the axial advancement of the medium. Its core advantage lies in:
Stability: The output pressure is not affected by the rotational speed, and the pulsation rate is less than 3%
High viscosity adaptability: Capable of handling high-viscosity media up to 760mm²/s (such as heavy oil, asphalt)
Self-priming capacity: The dry priming height can reach 8 meters, making it particularly suitable for loading and unloading scenarios in oil depots
Centrifugal pumps rely on the centrifugal force generated by the rotation of the impeller to convey fluids. Their characteristics are manifested as follows:
Large flow rate advantage: The single machine flow rate can reach 2000m³/h, meeting the municipal water supply demand
Simple structure: The 25-40mm small-diameter model is suitable for fine chemical feeding
The energy efficiency curve is steep: The optimal operating point must strictly match the system parameters
II. The Breakthrough Strategy of Shuangjin Machinery
As a leading enterprise in the industry, Shuangjin Machinery has broken through technological bottlenecks through independent innovation:
Screw pump temperature resistance upgrade: Special alloy screws are adopted to increase the upper limit of working temperature to 150℃
Miniaturization of centrifugal pumps: Developing 25mm micro chemical pumps to fill the gap in the fine chemical industry
Intelligent adaptation system: Automatically recommends pump types based on the viscosity of the medium, reducing the rate of selection errors
Post time: Oct-10-2025