Motor-Driven Compressor Housing Stiffness and Vibration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Motor-driven compressors experience noise due to vibrations in the shaft support housing member and intermediate housing member during high-load operations, primarily caused by inadequate fixation and vibration transmission from the check valve's opening and closing actions.
Innovation Solution
The integration of a flange on the shaft support housing member, which is securely fixed to the intermediate and motor housing members using bolts, enhances the structural stiffness and reduces vibrations, while the peripheral wall of the intermediate housing member increases the overall stiffness and suppresses noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the shaft support housing member is merely indirectly fixed via the compression mechanism without direct bolt connection, then the device complexity is reduced, but the shaft support housing member is not fixed firmly enough and is prone to vibration
Solution Approach 1:
The shaft support housing member is segmented into a main body and a flange portion, where the flange extends radially outward to provide a dedicated fixation interface. This segmentation allows the flange to directly receive bolt fastening forces, separating the support function from the fixation function and enabling firm direct connection to the intermediate housing member.
Solution Approach 2:
The flange acts as an intermediary element between the shaft support housing member and the intermediate housing member. It provides a dedicated interface that directly receives and transmits the fastening forces from bolts, serving as a mediator that ensures stable fixation without requiring complex indirect connection paths through the compression mechanism.
2Ease of manufacture
If the intermediate housing member has insufficient stiffness, then the ease of manufacture is improved, but the vibration of the intermediate housing member generates noise
Solution Approach 1:
The peripheral wall thickness of the intermediate housing member is optimized to provide sufficient stiffness to suppress vibrations generated by check valve operations, while maintaining manufacturability. This parameter adjustment ensures the housing member has adequate rigidity to reduce noise without overly complicating the manufacturing process.
3Ease of operation
If the shaft support housing member is lightly constructed for ease of assembly, then the ease of operation is improved, but high-speed rotation causes strong vibrations that generate noise
Solution Approach 1:
The shaft support housing member is divided into a main body and a flange portion, where the flange provides a dedicated fixation interface. This segmentation enables simple assembly through direct bolt connection while the flange's structural design ensures sufficient stiffness to suppress vibrations during high-speed rotation, resolving the contradiction between ease of assembly and vibration suppression.
Data Source
AI summary
A flange is held by a peripheral wall of an intermediate housing member and a peripheral wall of a motor housing member. In this state, bolts are passed through the intermediate housing member and the flange and are threaded to a peripheral wall of the motor housing member, thereby integrally fixing a shaft support housing member to the intermediate housing member and the motor housing member. Thus, the shaft support housing member sufficiently receives the fastening force of the bolts. Vibration of the shaft support housing member is therefore easily suppressed. The intermediate housing member includes a peripheral wall. Thus, the intermediate housing member has a higher stiffness than in a case in which the intermediate housing member does not have the peripheral wall.