Passive Drain Valve for Lubrication Systems
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Solution Overview
Problem
Lubrication systems face the risk of mechanical assembly components being submerged in hot lubricating media due to pump failure, leading to potential damage and system downtime, especially in applications where electromechanically actuated valves are heavy and require frequent maintenance.
Innovation Solution
A lubrication system with passive drain valves located above the normal operating level, which open in response to a predefined threshold temperature, using thermally activated materials that change phase or volume to automatically drain excess lubricating media and prevent submersion, reducing the need for electromechanical components and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromechanically actuated valves are used to drain lubricating media, then the system can prevent submersion of mechanical components, but the system becomes heavier and requires frequent maintenance
Solution Approach 1:
The drain valve is designed to automatically open and close based on the temperature of the lubricating media. The thermally activated material in the valve plug responds directly to temperature changes, causing the valve to drain excess lubricant without requiring external control systems, thereby eliminating the need for electromechanical actuators and reducing maintenance requirements.
Solution Approach 2:
The patent replaces electromechanical actuation systems with a passive thermal-mechanical system. The thermally activated material undergoes phase or volume changes in response to temperature, directly actuating the valve mechanism through thermal-mechanical coupling, thereby eliminating motors, sensors, and control electronics.
2Device complexity
If a passive drain valve using thermally activated material is used, then maintenance needs are reduced, but the valve must reliably detect predefined threshold temperature
Solution Approach 1:
The valve plug incorporates thermally activated material that undergoes a phase transition (e.g., from solid to liquid, or crystalline to amorphous) at a predefined threshold temperature. This phase change causes a significant volume or density change that directly actuates the valve opening mechanism, providing a sharp and reliable temperature threshold detection without requiring sensors or control systems.
Solution Approach 2:
The thermally activated material exhibits significant thermal expansion or volume change at the threshold temperature. This expansion directly pushes or pulls the valve plug to open or close the drain valve, creating a passive but precise temperature-actuated response that eliminates the need for active temperature sensing and control.
3Reliability
If the drain valve is positioned above normal operating level, then it can prevent submersion, but it must respond quickly to temperature changes
Solution Approach 1:
The thermally activated material undergoes a rapid phase transition when the lubricating media reaches the threshold temperature. This phase change occurs quickly and causes an immediate volume or density change that rapidly actuates the valve plug, enabling fast response time despite the valve being positioned above the normal operating level.
Solution Approach 2:
The valve design incorporates a piston and fluid pressure system where the thermally activated material's volume change creates pressure differential that rapidly moves the piston and actuates the valve plug. This hydraulic amplification mechanism accelerates the response time of the passive valve system.
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 system effectively prevents hazardous immersion of mechanical components, ensuring safe operation and reducing maintenance needs by passively detecting and draining hot lubricating media, thus enhancing reliability and performance in various mechanical assemblies.
Implementation Method 1
the spring comprises a thermally-activated material arranged to respond to a temperature rise of the spring by changing volume
Implementation Method 2
the spring comprises a thermally-activated material arranged to respond to a temperature rise of the spring by changing volume and altering a spring rate of the spring
Implementation Method 3
the lubricating media acts on the valve plug and overcomes a bias force of the spring
Data Source
Figure 1~2
Figure 3
Figure 4A~4C
AI summary
A lubrication system (200) is disclosed. The lubrication system (200) may have a collection area (300) for collecting lubricating media (120) and a pumping system (400) for transporting the lubricating media (120) from a withdrawal location of the collection area (300) to a distribution location (440) of the collection area (300). The lubricating media (120) may collect in the collection area (300) to a static level (380) when the pumping system (400) is off and to a dynamic level (370) when the pumping system (400) is on. The lubrication system (200) may also include a drain valve (500, 520, 550, 580) located between the static level (380) and the dynamic level (370). The drain valve (500, 520, 550, 580) may operable to open to drain a portion of the lubricating media (120) in response to the lubricating media (120) reaching a predefined threshold temperature and level. The valve (500, 520, 550, 580) may comprise a thermally-activated material (560), and the material (560) may substantially change phase or volume upon reaching a predetermined temperature.