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    Structure, Working Principle, and Application Fields of Single-Stage Centrifugal Pumps

    Publication Date:

    2025-12-12

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    In the field of industrial fluid conveyance, single-stage centrifugal pumps have become core equipment in industrial and agricultural applications as well as municipal engineering projects, thanks to their advantages such as simple structure and stable operation. According to... GB/T5656-2013 The standard “Technical Specifications for Centrifugal Pumps” defines a single-stage centrifugal pump as a pump type that contains only one impeller, with its head range limited to: 10-150 The pump, structurally, is further divided into single-stage, single-suction centrifugal pumps (also known as end-suction pumps) and single-stage... Double-suction centrifugal pump (Also known as a mid-open pump) is suitable for conveying media such as clear water, mildly corrosive liquids, and low-concentration mineral slurries. In this article, the centrifugal pump manufacturer... Changsha Zhonglian Pump Industry Let’s now introduce the structure, working principle, and application areas of single-stage centrifugal pumps, giving our users a basic understanding of these pumps.

     

    Single-stage centrifugal pump

    Please click on the image to learn about the model specifications and product details of Changsha Zhonglian Pump Industry’s [single-stage centrifugal pumps].

     

     

    I. Core Structure and Working Principle of Single-Stage Centrifugal Pumps

     

    A single-stage centrifugal pump consists of six key components, each of which works in synergy to achieve energy conversion:

    Pump casing: Made of cast iron or 304 Stainless steel casting, forming a sealed flow path to minimize energy loss; the flow path efficiency must be ≥ 75%。

    Impeller: As the core power component, it rotates at high speed ( 1450-2900r/min It converts the mechanical energy input by the motor into kinetic energy of the liquid; its design directly affects the head and efficiency.

    Pump shaft: Adopted 45# Precision machining of the steel shaft, transmitting torque and supporting the impeller; axial runout must be controlled to ≤. 0.05mm To ensure smooth operation.

    Guide vane ring: Optimizes fluid flow direction, reduces vortex losses, and enhances energy conversion efficiency.

    Mechanical seal: Employs a double-end-face sealing structure (e.g., 302-20 Model), to prevent medium leakage and impurity intrusion; the leakage standard is ≤ 10 Drop / Minutes.

    Bearing assembly: Equipped with deep-groove ball bearings, with a maximum operating temperature limit of ≤ 85 ℃, ensuring continuous operational stability.

     

    In the working process, the motor drives the pump shaft to rotate, and the impeller generates centrifugal force to draw liquid from the inlet. After being guided by the diffuser ring, the liquid is conveyed through the mechanical seal chamber to the outlet. The actual head developed depends on the impeller diameter and rotational speed, as described by the following formula: $H=\frac{u^2}{2g}-\Delta h$ ( $u$ For the circumferential velocity of the impeller, $\Delta h$ For loss).

     

    II. Precise Differentiation Between Single-Stage and Multi-Stage Pumps

     

    A single-stage centrifugal pump contains only one impeller, and its maximum head is 125 The pump is suitable for medium- and low-head applications such as urban water supply and small-scale irrigation. A multistage centrifugal pump achieves high-head output by connecting two or more impellers in series. 125-1000 meters), and are widely used in high-demand applications such as mine drainage and feedwater for high-pressure boilers. It is particularly important to emphasize that the head increase of multistage pumps relies entirely on the cumulative effect of the number of impeller stages, and is independent of the number of motor stages (e.g., " Equipped with a four-stage motor " is an incorrect statement). For example, 150 The Mi Yang Cheng demand should be selected. 3 Stage pump (per stage) 50 meters), rather than adjusting the motor configuration. The figure below shows a multistage pump.

     

    Multistage centrifugal pump

    Please click on the image to learn about the model specifications and product details of Changsha Zhonglian Pump Industry’s [Multistage Centrifugal Pumps].

     

     

    III. Industry Applications and Optimization Practices in Single-Stage Centrifugal Pumps

    1. Standard application areas

    Clear water conveyance: Urban water supply network (flow rate) 5-500m ³ /h ), the medium must be free of solid particles.

    Weakly corrosive medium: Electroplating wastewater treatment ( pH4-9 , temperature ≤ 60 ℃), needs to be matched 316L Stainless steel material.

    Low-concentration slurry: Coal preparation plant wash water system (with solid content ≤ 0.5% ), avoid using single-stage pumps to prevent wear and tear.

    2. Key Issue Solutions

    Mechanical seal leakage is often caused by wear on the sealing surfaces. This issue can be effectively addressed by using silicon carbide counterfaces and a double-end-face sealing structure. The decline in impeller efficiency is frequently due to cavitation or improper design; optimizing the impeller inlet angle can help mitigate this issue. 15 ° -25 °Can significantly improve energy conversion efficiency; if the pump body vibration exceeds the standard, it is due to excessive bearing clearance, and the bearing clearance must be precisely adjusted to... 0.02-0.05mm。

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    What is the difference between a single-suction centrifugal pump and a double-suction centrifugal pump?

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    Centrifugal Pump Head Selection for the Chemical, Municipal, and Water Supply Industries: Influencing Factors and Compliance Considerations

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