Centrifugal Compressor Cooling Path Using Diverted Working Fluid
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Solution Overview
Problem
Current aircraft cooling systems face inefficiencies in cooling the motor and bearings of centrifugal compressors, as external hardware like heat exchangers and fans are often required to manage the thermal energy generated, which can be cumbersome and less effective.
Innovation Solution
A centrifugal compressor arrangement with a primary and secondary flow path is introduced, where the compressor fluid is diverted from the primary path to a secondary path to cool the compressor components, including the motor and bearings, allowing for efficient thermal energy transfer back to the primary path for re-use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external hardware like heat exchangers and fans are used to cool the motor and bearings, then the thermal energy can be managed, but the device complexity increases and cooling effectiveness decreases
Solution Approach 1:
The patent merges the cooling function with the existing compressor system by integrating a cooling path arrangement that uses the compressor fluid itself to cool the motor and bearings. The cooling path includes inlet and outlet ports connected to the fluid passage, allowing the refrigerant to absorb heat from the motor and bearings directly within the compressor housing, eliminating the need for separate external cooling hardware.
Solution Approach 2:
The compressor system cools itself by utilizing its own working fluid (refrigerant) to remove heat from the motor and bearings. The cooling arrangement allows the compressor fluid to flow through passages that are thermally coupled to the motor and bearing assemblies, enabling the system to manage its own thermal energy without external intervention.
2Loss of energy
If external cooling hardware is used, then thermal energy can be removed, but the system performance and efficiency deteriorate
Solution Approach 1:
The compressor fluid serves multiple functions: it compresses the refrigerant in the compressor cylinders and simultaneously acts as a cooling medium for the motor and bearings. This multi-functional use of the same fluid stream improves system efficiency by recovering thermal energy that would otherwise be wasted, and by eliminating the energy consumption associated with external cooling devices like fans and pumps.
3Temperature
If the compressor fluid is diverted to cool components, then cooling efficiency improves, but the primary compression function may be affected
Solution Approach 1:
The cooling arrangement is segmented into separate inlet and outlet ports with dedicated cooling passages that branch off from the main fluid passage. This segmentation allows the cooling function to be performed in parallel with the compression function, as the cooling paths are distinct from the primary compression flow paths, minimizing interference with compression efficiency while effectively removing heat from the motor and bearings.
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
This configuration enhances cooling efficiency by directly utilizing the compressor fluid to manage thermal energy within the compressor components, reducing the need for external cooling hardware and improving overall system performance.
Implementation Method 1
a first compressor portion configured to compress a fluid and a second compressor portion configured to compress the fluid more than the first compressor portion
Implementation Method 2
The second compressor portion is configured to divert at least some of the fluid from the primary flow path and to communicate the diverted fluid back to the first compressor portion along a secondary flow path
Data Source
AI summary
An example compressor arrangement includes a first compressor portion configured to compress a fluid and a second compressor portion configured to compress the fluid more than the first compressor portion. The compressor arrangement also includes a motor disposed between the first compressor portion and the second compressor portion. The first compressor portion is configured to communicate the fluid to the second compressor portion along a primary flow path. The second compressor portion is configured to divert at least some of the fluid from the primary flow path, communicating the diverted fluid back to the first compressor portion along a secondary flow path.