Process and a device for determining the erosion caused by cavitation in components through which fluid flows
First Claim
1. A method for determining the erosion rate caused by cavitation in components through which fluid flows, comprising the steps of:
- measuring the vibration of an outer wall of the component of at least one point;
calculating a fluid-borne noise using the vibration; and
calculating an erosion rate using the fluid-borne noise and an empirically determined relationship between the fluid-borne noise and the erosion rate.
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Accused Products
Abstract
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.
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Citations
32 Claims
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1. A method for determining the erosion rate caused by cavitation in components through which fluid flows, comprising the steps of:
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measuring the vibration of an outer wall of the component of at least one point; calculating a fluid-borne noise using the vibration; and calculating an erosion rate using the fluid-borne noise and an empirically determined relationship between the fluid-borne noise and the erosion rate. - View Dependent Claims (2, 3, 4, 7, 8)
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5. A device for determining the erosion rate caused by cavitation in a component through which fluid flows, comprising:
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a measuring sensor having means for detecting a vibration of the component and means for producing a vibration signal; a signal processing unit having means for receiving the vibration signal from the measuring sensor and means for processing the vibration signal and producing a processed signal; and a computer having means for receiving the processed signal from the signal processing unit and means for calculating a value representing the fluid-borne noise from the processed signal by a numerical method, the computer further comprising means for determining an erosion rate from the value representing the fluid-borne noise. - View Dependent Claims (6, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for determining the erosion rate caused by cavitation in components through which fluid flows, comprising the steps of:
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measuring the structure-borne noise of an outer wall of the component at at least one point; calculating a fluid-borne noise using the structure-borne noise; and calculating an erosion rate using the fluid-borne noise and an empirically determined relationship between the fluid-borne noise and the erosion rate. - View Dependent Claims (19, 20, 28)
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21. A device for determining the erosion rate caused by cavitation in a component through which fluid flows, comprising:
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a measuring sensor having means for detecting a structure-borne noise of the component and means for producing a structure-borne noise signal; a signal processing unit having means for receiving the structure-borne noise signal from the measuring sensor and means for processing the structure-borne noise signal and producing a processed signal; and a computer having means for receiving the processed signal from the signal processing unit and means for calculating a value representing the fluid-borne noise from the processed signal by a numerical method, the computer further comprising means for determining an erosion rate from the value representing the fluid-borne noise. - View Dependent Claims (22, 23, 24, 25, 26, 27, 29, 30, 31, 32)
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Specification