Propulsion Unit Hydraulic Fluid Conditioning Control
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Solution Overview
Problem
Propulsion units for aquatic vehicles face premature wear and reduced sealing efficiency due to hydraulic fluid degradation and overpressure issues within rotary bearings, which are exacerbated by conditioning modules used to maintain fluid properties.
Innovation Solution
A propulsion unit with a conditioning control device that uses temperature sensors to optimize hydraulic fluid conditioning by selectively activating or deactivating the conditioning module based on temperature thresholds, reducing energy consumption and minimizing overpressure, thereby improving sealing and extending the life of sealing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conditioning module is continuously activated to maintain hydraulic fluid properties, then the lubrication quality is improved, but overpressure occurs inside the closed bearing spaces and sealing device life is reduced
Solution Approach 1:
The conditioning module operates periodically rather than continuously. The control device monitors temperature and activates the conditioning module only when thermal thresholds are exceeded, creating intermittent operation cycles that prevent sustained overpressure buildup while still maintaining adequate lubrication when needed
2Reliability
If the conditioning module is activated to cool the hydraulic fluid, then the lubricating properties are maintained, but energy consumption increases
Solution Approach 1:
The conditioning module is activated only during periods when temperature thresholds are exceeded, rather than operating continuously. This periodic activation based on thermal monitoring significantly reduces energy consumption while maintaining lubrication quality only when thermally necessary
Solution Approach 2:
The system uses temperature sensors and control devices that automatically monitor and respond to thermal conditions, enabling the system to self-regulate conditioning activation without external intervention, thereby optimizing energy usage based on actual operational needs
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 solution effectively manages hydraulic fluid conditioning to prevent premature wear and leakage, enhancing the operational efficiency and longevity of sealing devices while reducing energy consumption and maintaining optimal lubrication of bearings.
Implementation Method 1
a conditioning control device being provided which comprises a temperature sensor
Implementation Method 2
Bearings are often subjected to high mechanical stresses, particularly when the drive shaft and propulsion element rotate for long periods of time. These stresses result in the hydraulic fluid contained in the enclosed space heating up
Data Source
Figure 1
Figure 2
AI summary
This propulsion unit (2) for an aquatic vehicle comprises a movable casing (3) mounted in pivot connection relative to a hull element (4) of the aquatic vehicle, a drive shaft (20) of a propeller (25), said shaft (20) being rotatably mounted inside the movable casing (3) by means of at least one bearing (26, 28) comprising a closed space (40, 42) intended to be filled with a hydraulic fluid, an electric machine (30) being capable of driving the drive shaft (20) in rotation relative to the movable casing (3), the propulsion unit (2) further comprising a conditioning module (36) for the hydraulic fluid contained in the closed space (40, 42) of the bearing (26, 28).The propulsion unit (2) further comprises a conditioning control device (82), the control device (82) comprising a temperature sensor (84, 86) and being capable of actuating the conditioning of the hydraulic fluid contained in the closed space (40, 42) as a function of the temperature measured by the temperature sensor (84, 86).