Hydraulic Rod Seal Leakage Detection Using Pressure Fluctuations
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Solution Overview
Problem
Existing fluid leakage detection systems struggle to accurately detect leaks in hydraulic cylinders when the pressure is low, as the pressure increase in the detection space is insufficient to trigger an alert, leading to missed detections even when the rod seal wears out.
Innovation Solution
A fluid leakage detection system that includes a detection unit to monitor pressure fluctuations in a detection space between the piston rod and cylinder head, using a controller to calculate pressure parameters and determine leakage based on upper and lower limit values, and a relief valve to manage pressure, improving detection accuracy by considering both high and low-pressure scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure threshold alert system is used to detect fluid leakage, then detection is effective under high-pressure conditions, but detection accuracy deteriorates under low-pressure conditions
Solution Approach 1:
The system transitions from detecting absolute pressure threshold to detecting pressure fluctuation parameters (rate of change, amplitude, frequency). By monitoring how pressure changes over time rather than static pressure levels, the system can detect leaks across varying operating pressures including low-pressure conditions where traditional threshold methods fail.
Solution Approach 2:
The detection method shifts from static pressure monitoring to dynamic pressure fluctuation analysis. By examining the temporal characteristics of pressure changes (fluctuation patterns, frequency, amplitude), the system adapts to different operating conditions and detects leaks regardless of the baseline pressure level.
2Reliability
If a simple pressure threshold alert is used, then the device complexity is low, but detection reliability is insufficient under varying pressure conditions
Solution Approach 1:
The system continuously monitors pressure fluctuations and compares them against learned or predefined patterns indicative of leakage. By implementing feedback-based detection that analyzes pressure change dynamics rather than simple threshold crossing, the system achieves higher reliability across varying conditions while maintaining reasonable system complexity through efficient signal processing.
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
Enhances detection accuracy by using pressure and temperature parameters to determine fluid leakage, even in low-pressure conditions, allowing for timely identification of rod seal degradation and preventing hydraulic cylinder performance issues.
Implementation Method 1
a sensor unit configured to detect pressure in the detection space
Implementation Method 2
a relief valve configured to release the pressure in the detection space by being opened when the pressure in the detection space reaches a predetermined value
Data Source
AI summary
A fluid leakage detection system has a detection space to which working oil leaked out through a rod seal is guided; the rod seal being configured to seal an annular gap between a piston rod and a cylinder head; a sensor unit configured to detect pressure in the detection space; and a controller configured to acquire detected result from the sensor unit, wherein the controller has: a calculation unit configured to calculate a pressure parameter representing a pressure fluctuation in the detection space; a determination unit configured to determine occurrence of leakage of the working oil based on the pressure parameter; and the pressure parameter includes an upper limit value and a lower limit value of the pressure fluctuation obtained from the detected result detected by the sensor unit within a predetermined detection period.