Plunger pump fault diagnosis method based on three-port temperature and outlet pressure

Abstract

The invention discloses a plunger pump fault diagnosis method based on three-port temperature and outlet pressure. The method comprises the following steps that (A) real-time temperature signals and outlet pressure signals of an oil inlet, an oil return opening and an oil drainage opening of the plunger pump are obtained; (B) the collected temperature and pressure data are preprocessed; (C) constructing a three-port temperature characteristic curve, and analyzing a temperature rise and temperature difference rule; (D) carrying out coupling modeling on the pressure characteristics and the three-port temperature characteristics to form a multi-parameter characteristic matrix; and (E) matching the characteristic matrix with a typical fault mode database of the plunger pump, and judging the running state and the fault type of the plunger pump. Accurate identification of the operation state and the fault type is achieved, dependence on a high-frequency pressure sensor is avoided, the monitoring cost is reduced, diagnosis of abnormal working conditions such as abrasion, leakage and energy loss of the plunger pump is achieved through the pressure-temperature rise coupling relation, the accuracy and the real-time performance of fault identification are remarkably improved, and the working efficiency is improved. And reliable technical support is provided for health management and safe operation of the plunger pump.

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