Pump Cavitation Detection Using Suction Pressure Compensation
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Solution Overview
Problem
Conventional cavitation detection devices struggle with inaccurate detection due to difficulties in transmitting pressure variations when cavities hinder pressure transmission, particularly in positive displacement pumps, leading to unstable detection.
Innovation Solution
A detection device that calculates a variation coefficient based on suction pressure data and adjusts it using a pressure transmission coefficient to enhance detection accuracy, even in low-pressure conditions, by multiplying the coefficient by a value inversely proportional to the suction pressure to compensate for transmission issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure variation is used for cavitation detection, then cavitation occurrence can be detected, but detection accuracy deteriorates when pressure transmission is hindered by cavities
Solution Approach 1:
The patent changes the detection parameter from raw pressure variation to a corrected pressure variation that compensates for transmission losses. By introducing a correction coefficient based on suction pressure magnitude, the system adapts the detection parameter to account for reduced pressure transmission efficiency at low pressures, thereby maintaining detection accuracy across varying operating conditions
Solution Approach 2:
The patent implements feedback by using the suction pressure value itself to determine the correction coefficient. The suction pressure measurement feeds back into the detection algorithm to dynamically adjust the expected pressure variation magnitude, allowing the system to compensate for transmission hindrances caused by cavities and maintain reliable detection
2Adaptability or versatility
If suction pressure is remarkably low, then cavitation may occur more readily, but pressure variation transmission to sensor is hindered
Solution Approach 1:
The system dynamically changes the detection parameter based on suction pressure level. At low suction pressures where cavitation is more likely but transmission is hindered, the correction coefficient increases the expected pressure variation magnitude, allowing accurate detection despite reduced transmission efficiency
Solution Approach 2:
The patent applies preliminary correction to the pressure variation measurement based on the suction pressure level before making the cavitation determination. By anticipating the transmission loss at low pressures and pre-compensating for it, the system prevents detection errors that would otherwise occur in low-pressure zones
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device improves cavitation detection accuracy by accurately identifying cavitation occurrences even when suction pressure is remarkably low, expanding the detection range and ensuring reliable detection across varying pressure zones.
Implementation Method 1
a pressure sensor, and obtains a variation coefficient, such as a standard deviation or moving average value, from the value of the suction pressure
Implementation Method 2
The cavitation is a physical phenomenon in which gas bubbles or cavities appear and disappear in a short period of time due to pressure differences within a liquid
Data Source
AI summary
A suction pressure acquisition unit acquires pressure data indicating pressure of a pump. A variation coefficient calculation unit calculates a variation coefficient indicating amplitude of pressure magnitude of the pump on a basis of the pressure data acquired by the suction pressure acquisition unit. An adjustment unit performs adjustment detection information that includes the variation coefficient calculated by the variation coefficient calculation unit, by using a pressure transmission coefficient representing ease of transmission for pressure of the pump. The detection information is used for cavitation occurrence detection. A determination unit 125 detects cavitation occurrence in the pump on a basis of the detection information adjusted by the adjustment unit.