Compressor Motor and Bearing Cooling Paths
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Solution Overview
Problem
Air machines, such as those used in aircraft, face heat accumulation issues in compressors and bearings, leading to inefficiencies and potential damage due to inadequate cooling systems.
Innovation Solution
A compressor design incorporating a motor cooling loop and a bearing cooling loop, with a rotor and shaft configuration that allows for effective air circulation and cooling, including a bearing support and seals to manage air flow and temperature, enhancing the cooling efficiency of both the motor and bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cooling system is used in the compressor, then the structure is simpler, but heat accumulation occurs in the motor and bearings leading to inefficiencies and potential damage
Solution Approach 1:
The cooling system is segmented into distinct cooling paths: a first cooling path for the motor and a second cooling path for the bearings. This segmentation allows each component to be cooled independently through optimized airflow paths, improving reliability without requiring a completely complex integrated system. The motor cooling path includes inlet and outlet passages, while the bearing cooling path uses a separate bearing air inlet and cooling passages within the bearing support.
Solution Approach 2:
The compressor housing and bearing support serve multiple functions: they provide structural support, contain cooling passages, direct airflow, and support rotational components. The bearing support both supports the bearing and contains internal cooling passages. This multi-functionality reduces the need for additional dedicated cooling components, maintaining structural simplicity while achieving effective cooling.
2Temperature
If cooling air is provided to both motor and bearings through separate paths, then cooling effectiveness is improved, but the device complexity increases
Solution Approach 1:
The cooling system merges the motor cooling and bearing cooling functions within a unified compressor structure. The bearing cooling air inlet is positioned to receive cooling air that can flow through the bearing support, while the motor cooling passages are integrated into the same housing structure. This merging allows separate cooling paths to be implemented without proportionally increasing overall system complexity.
Solution Approach 2:
The cooling system utilizes the compressor's own operational airflow and structural components to provide cooling. The bearing support structure itself contains the cooling passages, and the compressor housing serves as the cooling chamber. This self-service approach allows the structure to perform both mechanical support and thermal management functions, reducing the need for external or additional dedicated cooling components.
3Duration of action of stationary object
If adequate cooling is provided to prevent heat accumulation, then component longevity is improved, but the structural complexity of the compressor increases
Solution Approach 1:
The cooling passages are arranged in specific spatial dimensions within the bearing support and housing structure. The first cooling path extends along the motor length, while the second cooling path includes passages within the bearing support that direct cooling air to the bearing. This dimensional arrangement allows effective cooling to be achieved through the existing three-dimensional structure without adding separate cooling components.
Solution Approach 2:
Cooling air acts as an intermediary medium that transfers thermal energy from the motor and bearings to the surrounding environment. The bearing support and housing structure serve as intermediaries that contain and direct this cooling air through optimized pathways. This intermediary approach allows heat removal without requiring direct thermal contact between cooling components and the motor/bearings, simplifying the overall structure.
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 reduces heat buildup in the compressor and bearings, improving the reliability and longevity of components by providing targeted cooling, thereby enhancing the overall performance and efficiency of the air machine.
Implementation Method 1
A motor cooling loop is configured to provide motor cooling air to the motor
Implementation Method 2
A bearing cooling loop is configured to provide bearing cooling air to the at least one bearing
Implementation Method 3
The rotor includes an opening which is configured to communicate bearing cooling air into a cavity between the rotor and the bearing support
Data Source
AI summary
A compressor includes a rotor driven by a shaft and configured to compress air, and a motor for driving the shaft. At least one bearing is utilized for facilitating rotation of the shaft. A motor cooling loop is configured to provide motor cooling air to the motor. A bearing cooling loop is configured to provide bearing cooling air to the at least one bearing. A bearing support is configured to support the least one bearing. The rotor includes an opening which is configured to communicate bearing cooling air into a cavity between the rotor and the bearing support. A method for cooling a compressor is also disclosed.