Rotor Shaft Scattering Grooves for Turbine Oil Carbonization
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Solution Overview
Problem
In turbine systems, bearing oil often reacts with high-temperature and high-pressure gases or steam, leading to carbonization when it flows towards the oil deflector, as existing labyrinth seals and brush seals may not function properly during rotor movement, allowing oil to enter the turbine and react with operating fluids.
Innovation Solution
A rotor shaft structure with inclined scattering grooves and potential interruption features, such as fine grooves or protrusions, is implemented between the bearing supporter and oil deflector to redirect and block the flow of bearing oil, preventing it from reaching the oil deflector and thus reducing carbonization risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If labyrinth seal and brush seal are installed to block bearing oil flow, then oil blocking function is improved, but rotor movement in axial or circumferential direction causes seals to malfunction
Solution Approach 1:
The invention changes the geometric parameters of the rotor shaft surface by forming scattering grooves with specific inclination angles (α) relative to the axial direction. These grooves have defined depth (h) and width (w) parameters that enable them to effectively scatter bearing oil under centrifugal force while accommodating rotor movement in axial or circumferential directions, thus maintaining oil blocking reliability during operation.
2Reliability
If bearing oil flows toward oil deflector to lubricate bearing, then bearing operation is improved, but oil reacts with high-temperature gas or steam causing carbonization
Solution Approach 1:
The invention extracts the harmful element (bearing oil) from its problematic path by using scattering grooves to redirect oil flow away from the oil deflector and high-temperature gas/steam regions. The grooves capture oil flowing along the rotor shaft and scatter it toward the casing, preventing contact between oil and high-temperature operating fluids while still allowing bearing lubrication.
Solution Approach 2:
The scattering grooves act as an intermediary structure between the bearing supporter and oil deflector. Instead of allowing direct oil flow toward the deflector where carbonization occurs, the grooves mediate the oil's path by utilizing centrifugal force to redirect it safely toward the casing, thus preventing the harmful thermal reaction.
3Reliability
If scattering groove is formed on rotor shaft to remove bearing oil, then oil flow toward deflector is blocked, but additional manufacturing steps are required
Solution Approach 1:
The scattering grooves create a controlled porous-like surface structure on the rotor shaft. This groove pattern (with multiple grooves arranged circumferentially) allows the shaft surface to function as both a structural component and an oil scattering mechanism, integrating the oil removal function into the existing rotor shaft without requiring separate components.
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 described rotor shaft structure effectively blocks the flow of bearing oil towards the oil deflector, preventing carbonization by utilizing centrifugal force to scatter the oil away from the deflector, thereby enhancing the operational lifespan of turbine components.
Implementation Method 1
utilizing centrifugal force to scatter the oil away from the deflector
Data Source
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AI summary
The present invention relates to a structure for a rotor of removing bearing oil, including a rotor shaft disposed in a casing of a turbine and an annular oil scattering means formed between an oil deflector and a bearing supporter on the rotor shaft in a circumferential direction to scatter bearing oil flowing from the bearing supporter toward the oil deflector along a surface of the rotor shaft. According to the present invention, it is possible to suppress carbonization caused by reaction with high-temperature operating fluid at the oil deflector by removing the bearing oil flowing between the bearing and the oil deflector along the rotor shaft.