Electric Compressor Vibration Isolation via Bonded Bolt Member
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Solution Overview
Problem
The existing electric compressor designs fail to effectively isolate vibration between the cover member and the accommodation portion body, leading to noise issues due to metal contact and inadequate gasket performance.
Innovation Solution
Incorporating a vibration isolation member between the bolt head and the cover member, which is bonded to both surfaces, and using a gasket with a surging frequency higher than the primary eigenvalue of the cover member to suppress vibrations and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the accommodation portion body and cover member are fastened with bolts via a gasket, then the structure is simple and easy to manufacture, but the gasket may separate during displacement and fail to isolate vibration effectively
Solution Approach 1:
A vibration isolation member is introduced as an intermediary component between the bolt head and the cover member. This member includes a vibration isolation portion that contacts the cover member and a head portion that contacts the bolt head, creating a reliable vibration isolation path that maintains connection even when the gasket separates during displacement.
Solution Approach 2:
The vibration isolation member extends in the thickness direction of the cover member, utilizing the third dimension to maintain effective vibration isolation. By positioning the vibration isolation portion and head portion at different locations through the thickness direction, the structure ensures continuous contact and isolation effectiveness regardless of displacement direction.
2Device complexity
If the gasket is disposed on the outer surface of the cover member, then the structure is simple, but it cannot effectively suppress vibration when the cover member displaces away from the accommodation portion body
Solution Approach 1:
The vibration isolation member serves as a mediator between the fastening structure and the cover member, providing a dedicated vibration isolation path that is independent of the gasket's position. This ensures effective noise suppression regardless of whether the cover member displaces toward or away from the accommodation portion body.
Solution Approach 2:
The vibration isolation member is pre-installed between the bolt head and the cover member to provide beforehand cushioning against vibration. This proactive isolation measure ensures that vibration is suppressed before it can propagate to the cover member, regardless of displacement conditions.
3Object-affected harmful factors
If a vibration isolation member is added between the bolt head and cover member, then noise is effectively reduced, but the device complexity increases
Solution Approach 1:
The vibration isolation member is designed to perform multiple functions: it isolates vibration between the bolt head and cover member, maintains connection during displacement, and provides structural support. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The vibration isolation portion of the member is designed with flexible characteristics to effectively absorb and dampen vibration. This flexible design allows the component to maintain contact and isolation effectiveness while accommodating displacement, achieving noise reduction with a relatively simple structural form.
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 noise caused by cover member vibrations by maintaining the connection of the vibration isolation member across displacement directions, enhancing the suppression of vibrations and noise reduction.
Implementation Method 1
a first vibration isolation member that is disposed between the one surface of the head and the inner surface of the cover member and that is bonded to the one surface of the head and to the inner surface of the cover member
Implementation Method 2
bonded to the one surface of the head and to the inner surface of the cover member
Implementation Method 3
The gasket includes a flat metal core material and a foamed elastic body provided to cover both surfaces of the core material
Data Source
AI summary
This electric compressor (10) has: an accommodating case (15) that accommodates an inverter device (19) and includes an accommodating section body (31), a substrate support section (32) protruding from a bottom surface (31a) of the accommodating section body (31), and a cover member (34) that closes an opening in the accommodating section body (31); and an antivibration member (17) that is positioned between one surface (51a) of a head part (51) of a bolt (16) fastened to the substrate support section (32) and an inner surface (34a) of the cover member (34), and that is bonded to the one surface (51a) of the head part (51) and the inner surface (34a) of the cover member (34).