Centrifugal Compressor Resin Sealing for Pressure-Driven Air Leakage
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Solution Overview
Problem
In centrifugal compressors, a pressure difference between the motor chamber and the inverter chamber can cause the resin member and conductive member to detach, allowing air to flow into the inverter chamber and potentially lead to condensation, which negatively affects the inverter's reliability.
Innovation Solution
The centrifugal compressor design includes a resin member with a first resin portion and a second resin portion, where the second resin portion has a lower Young's modulus than the first resin portion, ensuring a secure fit and sealing around the conductive member, even when expansion differences occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single resin member is used to seal the insertion hole, then the structure is simple, but the resin member and conductive member may detach due to pressure difference and thermal expansion
Solution Approach 1:
The resin member is divided into two distinct portions: a first resin portion that provides structural support and sealing, and a second resin portion that specifically contacts and secures the conductive member. This segmentation allows each portion to perform its specialized function, preventing detachment while maintaining overall structural integrity.
Solution Approach 2:
The second resin portion is positioned locally at the interface with the conductive member, providing enhanced local sealing and mechanical attachment. This localized quality ensures that the critical connection point between the conductive member and housing is securely sealed, preventing air leakage at this specific location.
2Reliability
If the resin member is made rigid to maintain sealing, then sealing is improved, but thermal expansion differences cause detachment
Solution Approach 1:
The patent changes the material parameter (Young's modulus) of the resin member by creating two portions with different rigidity characteristics. The first resin portion has higher rigidity for structural support, while the second resin portion has lower rigidity to accommodate thermal expansion differences, allowing the system to maintain both sealing and attachment stability under varying temperature and pressure conditions.
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 maintains the close contact between the resin portions and the conductive members, preventing air from entering the inverter chamber and reducing the risk of condensation, thus enhancing the reliability of the centrifugal compressor.
Implementation Method 1
the second resin portion having a Young's modulus smaller than a Young's modulus of the first resin portion
Implementation Method 2
the resin member seals the insertion hole around the conductive member
Data Source
AI summary
A centrifugal compressor includes a compressor impeller, a motor, an inverter, a housing including a motor chamber and an inverter chamber, a conductive member, an insertion hole, and a resin member sealing the insertion hole. A pressure in the motor chamber is higher than that in the inverter chamber. The resin member includes a first resin portion fixed to the housing and a second resin portion which is covered with the first resin portion and which covers the conductive member, the second resin portion having a Young's modulus smaller than that of the first resin portion. The first resin portion and the second resin portion, and the second resin portion and the conductive member are coupled by insert-molding.