Fault Analysis and Treatment of High-Pressure Backwash Water Pump
Maintenance Department, Fujian Fuqing Nuclear Power CO.LTD, Fuqing 350318, China
| Abstract: | In order to find the root cause of the failure of the high-pressure backwash water pump encountered in practical work, the root cause of a series of problems such as coupling bolt strength, friction overload and insufficient exhaust is investigated one by one, and the cavitation hazard is studied and analyzed in combination with the cavitation conditions of the pump, and the research results show that the root cause of a series of problems such as mechanical seal damage, bearing damage, coupling bolt deformation, and deformation of the pump casing mouth ring riding joint screw is caused by insufficient exhaust, and insufficient exhaust causes the pump to have no output. The pump does not run out of force, causing the temperature of the medium in the pump to rise, and then vaporization occurs, which eventually leads to cavitation, and the bubble collapses on the near wall surface of the pump casing mouth ring, forming a shock wave, resulting in an increase in the force of the pump casing mouth ring, an increase in the rotation resistance of the pump, overload of the riding joint screw, high motor running current, and deformation of the coupling bolt. To prevent cavitation failure of the high-pressure backwash pump, it is necessary to ensure that the operating flow of the pump is operated within the safe range of minimum flow and critical cavitation flow, and the flow rate is too small or too large will cause cavitation of the high-pressure backwash pump. |
| Keywords: | Backwash Water Pump; Failure Analysis; Cavitation; Operation |
| DOI: | 10.57237/j.se.2023.06.002 |
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Received: 22 October 2023
Accepted: 13 November 2023
Published Online: 27 November 2023
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