Reverse Bypass Cooling for Tilting Pad Bearings
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Solution Overview
Problem
Existing bypass cooling systems for tilting pad journal and thrust bearings rely on spraying cool inlet oil in the direction of shaft rotation, which is not as effective when the oil needs to traverse uphill against gravity, leading to increased bearing temperatures and potential destructive friction due to reduced oil viscosity.
Innovation Solution
A bypass cooling system that directs cool inlet oil downhill with gravity, using blocker bars and circumferential axial passages to deliver liquid coolant in both standard and reverse bypass directions, ensuring effective heat transfer and cooling regardless of rotational direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cool inlet oil is sprayed in the direction of shaft rotation, then the cooling system works for standard rotation, but the oil cannot effectively traverse uphill against gravity, leading to increased bearing temperatures
Solution Approach 1:
The patent introduces reverse bypass cooling conduits that spray cool inlet oil in the opposite direction of shaft rotation, allowing the oil to flow downhill with gravity rather than uphill against it. This inverted approach to the conventional cooling direction enables effective heat removal regardless of rotation direction, resolving the temperature control issue
2Temperature
If the oil temperature rises, then the oil viscosity falls, but this leads to direct rubbing of metal surfaces and destructive friction
Solution Approach 1:
The bypass cooling system continuously removes heated oil from the bearing assembly and replaces it with cool inlet oil, creating a feedback loop that maintains optimal oil temperature. This prevents the viscosity degradation that would otherwise lead to metal-to-metal contact and bearing failure
Solution Approach 2:
The system extracts heated oil from the bearing assembly through bypass cooling conduits and drain holes, separating the hot oil from the cooling process. This allows the heated oil to be removed and replaced with fresh cool oil, preventing temperature buildup and viscosity loss
3Ease of manufacture
If bypass cooling oil is sprayed in the direction of shaft rotation, then the system is simple to implement, but it is not effective when oil must traverse uphill against gravity
Solution Approach 1:
The cooling system is segmented into multiple independent conduit paths: standard bypass cooling conduits for forward rotation and reverse bypass cooling conduits for opposite rotation. Each segment handles specific flow directions, allowing the system to maintain simplicity while achieving effective cooling in both rotation directions through gravity-assisted downhill flow
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 cools bearing assemblies by allowing cool inlet oil to flow downhill with gravity, improving heat removal and reducing friction, even when oil needs to traverse against the direction of shaft rotation, thus enabling higher speed and load operations without destructive temperature increases.
Implementation Method 1
spraying the cool inlet oil downhill with gravity instead of always in the direction of the shaft rotation
Implementation Method 2
convey the pressurized liquid lubricant carrying the heat generated by the bearing surface away from the assembly
Implementation Method 3
The cooling oil takes heat away from the pads and directs it into the drain thereby cooling the pads
Implementation Method 4
The opening allows developing a film of oil which supports the load
Data Source
AI summary
A bypass cooling system and method for tilting pad journal and titling pad thrust bearings wherein the cooling may be achieved by spraying the cool inlet oil downhill with gravity instead of always in the direction of the shaft rotation. A bypass cooling system always sprays the cool inlet oil downhill, with gravity instead of always in the direction of shaft rotation.