关键词: 往复泵, 盲源分离, 故障机理, 磨损, 实验验证

Abstract: Reciprocating pump is widely used in petroleum and petrochemical industry，it often transports liquid of high density，high viscosity and high sand content under high-pressure. Pump valve is one of the parts that are damaged most easily in the reciprocating pump hydraulic end. Its operation state will directly influence pump volumetric efficiency and working reliability. This paper discusses three breakdowns of BW-250 reciprocating pump hydraulic end，including spring break，valve disc wear and piston wear. Acceleration and displacement sensors were installed in the pump valve for real-time monitoring its state. Valve internal and external vibration signal characteristics were quantitatively analyzed and extracted by blind source separation. The result showed that aggravation of piston wear caused instability of pump suction and discharge pressure，which led to intensified valve disc and spring failure. Initiation and evolution of key component damage of BW-250 reciprocating pump hydraulic end was revealed，which could promote further research on failure mechanism and increase service life of pump valve.

Key words: reciprocating pump, blind source separation, failure mechanism, attrition, experimental validation