Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    方案 for Enhancing the Wear Resistance of Seals in Mining Multistage Pumps

    Publication Date:

    2026-05-22

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    Mining use Multistage pump The wear resistance and reliability of seals directly affect the operational stability and service life of pump units. To address seal‑related wear, a systematic optimization is required across four dimensions: material selection, structural design, surface treatment, and operation‑and‑maintenance management. Changsha Zoomlion Pump Industry In light of the harsh operating conditions in mining applications—high pressure, high temperature, and particle-laden media—a solution is proposed to enhance the wear resistance of sealing components in multi-stage mining pumps:

     

    Multistage pump for mining use

     

    I. Material Science Compatibility: Select wear‑resistant materials based on the characteristics of the process medium. For applications involving solid‑particle‑laden media, prioritize a silicon carbide ceramic seal ring paired with fluororubber. In corrosive‑medium environments, recommend polytetrafluoroethylene reinforced with glass fibers. For high‑temperature conditions (≤250°C), opt for metal‑ceramic composite seals. All materials must meet Changsha Zoomlion Pump Industry’s internal wear‑testing standards (ASTM G65 dry‑abrasion test, with a wear rate of less than 0.1 mm³/h).

     

    II. Structural Engineering Optimization

    1. It employs a dual mechanical seal design with a buffer fluid barrier, which balances the pressure gradient in the balance chamber and reduces wear on the primary sealing surfaces.

    2. Optimization of the sealing ring’s geometric parameters: the outer diameter is 0.2 mm smaller than the impeller’s sealing cavity, and the sealing face cone angle is maintained within 3°–5° to enhance the fluid‑dynamic pressure‑bearing capacity.

    3. Alloy wear-resistant protective rings are added to critical flow‑through sections to reduce direct particle impact.

     

    III. Surface Modification Techniques

    Using the plasma-spraying technology independently developed by Changsha Zhonglian Pump Industry, a WC‑Co alloy coating with a thickness of 0.15–0.2 mm is applied to the sealing surface, achieving a hardness of HRC 65–70 and a coating bond strength exceeding 60 MPa. For the sleeve area, laser cladding is employed to form a wear‑resistant Fe‑Cr‑Ni alloy layer, significantly extending the service life of the sealing components.

     

    IV. Intelligent Operations and Maintenance System

    1. Integrates vibration, temperature, and torque sensors to monitor the operating condition of the sealing interface in real time (an early warning is triggered when the vibration threshold exceeds 0.08 mm/s).

    2. Establish health records for sealing components and employ big data analytics to predict remaining service life (with an error margin of less than 15%).

    3. Equipped with a dedicated quick‑change tool for Changsha Zoomlion pump seals, maintenance downtime is reduced to within 4 hours.

    Through the aforementioned technological integration, the average service life of the sealing components in Changsha Zoomlion’s mining‑grade multistage pumps has increased by more than 40% compared with industry standards, as validated under typical operating conditions in coal mines and metal mines. It is recommended to dynamically adjust the sealing strategy based on pump‑unit operating data to ensure long‑term, stable performance.

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