Process and a device for determining the erosion caused by cavitation in components through which fluid flows

摘要

The erosion caused by cavitation in components through which fluid flows, such as, for example, a pump (1), can be derived by detecting the vibration in the pump casing. The fluid-borne noise caused by cavitation is transferred to the pump casing and is detected by a sensor (7b) of a structure-borne noise measuring device (7a), amplified, filtered and digitalized in a signal processing unit (10) and transmitted to a computer (11). Further measuring data detection devices such as the outlet pressure measuring device (6), the suction pressure measuring device (8), the fluid temperature measuring device (9) or the revolution counter (4) enable the computer (11) for example to calculate the flow rate or the correlation between the flow rate and the erosion rate. The values determined can be displayed via an output unit (13); for example, if a boundary value preset via an input unit (12) is exceeded, the output unit (13) activates a warning, for example.