Online fault diagnosis method and system for centrifugal pump

Abstract

The invention discloses an online fault diagnosis method and system for a centrifugal pump. According to the method, a vibration sensor is utilized for measuring a radial vibration signal in the operating process of a pump; the radial vibration signal is transmitted to a signal processing module; analysis treatment is conducted based on the cyclostationary theory so that a cyclic autocorrelation function can be obtained and subjected to slice analysis; feature parameters for distinguishing whether the pump breaks down or not and recognizing the breakdown type after it is determined that the pump breaks down are obtained; and a relevant breakdown diagnosis result is obtained by performing comparison and analysis on the feature parameters and corresponding parameters generated when the pump runs normally under the design working condition. According to the online fault diagnosis method and system for the centrifugal pump, diagnosis on mechanical seal damage and cavitation failures can be achieved by measuring the radial vibration signal of the pump, the running feature information of the pump can be reflected in the vibration signal in real time, the information integration degree is high, the number of signal transfer paths is small, the anti-jamming capability is high, and measurement reliability is high; and by analyzing stable components in the cyclic autocorrelation function of the signal, the situation that running is unstable due to the bias condition and consequently signal analysis is disturbed can be avoided, and specific reasons which cause unstable flowing of the centrifugal pump are identified.

Description

technical field [0001] The invention belongs to the field of testing methods for fluid machinery, and in particular relates to an online fault diagnosis method and system for centrifugal pumps based on the theory of cycle stability. Background technique [0002] As an important energy conversion and fluid delivery device, centrifugal pumps are widely used in various parts of the national economy and cutting-edge technical fields such as aerospace. Nowadays, centrifugal pumps are developing in the direction of heavy load, high speed and light weight. This makes the working intensity of the pump continuously increase and the working conditions become more and more severe. In addition, the structure of the pump is very complicated, and when it is operated under harsh conditions, various random factors will be generated, and various mechanical failures are prone to occur, which reduces its function. Pump failure can often cause catastrophic accidents and cause huge losses. Th...

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Problems solved by technology

The above patents all use the signal processing method to extract the characteristic parameters reflecting the fault to realize fault diagnosis, but only for mechanical faults, such as impeller damage, bearing damage, etc.

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