Co-Rotating Scroll Compressor Inverter Layout for Load-Induced Vibration
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Solution Overview
Problem
The compressive load acting in the radial direction of the driving scroll in a co-rotating scroll compressor causes vibration and noise amplification due to the placement of the inverter circuit on the outer peripheral surface of the housing, which is not effectively addressed in existing designs.
Innovation Solution
The inverter circuit is positioned on the outer peripheral surface of the housing, avoiding the change range of the compressive load direction in the circumferential direction of the driving scroll, thereby preventing vibration and noise amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inverter circuit is disposed on the outer peripheral surface of the housing, then the compressor size in the driving axis direction can be reduced, but vibration and noise are amplified due to the compressive load acting on the housing
Solution Approach 1:
The housing is designed with non-uniform thickness where the wall thickness varies in the circumferential direction. Specifically, the housing has a thicker portion and a thinner portion, with the inverter circuit disposed on the thicker portion. This local variation in thickness provides enhanced structural support and vibration resistance at the location where the inverter circuit is mounted, while maintaining overall compactness of the compressor.
Solution Approach 2:
The housing structure is pre-designed with varying wall thickness before the inverter circuit is installed. The thicker portion is strategically positioned at the location where the inverter circuit will be disposed, providing preemptive structural reinforcement. This preliminary structural preparation ensures that when the inverter circuit is mounted and subjected to compressive loads during operation, the housing is already equipped with sufficient strength and vibration resistance at that specific location.
2Device complexity
If the inverter circuit is disposed on the outer peripheral surface of the housing, then wiring can be simplified, but the thin case accommodating the inverter circuit amplifies vibration from the compressive load
Solution Approach 1:
The housing wall thickness is locally optimized at the inverter circuit mounting location. By providing a thicker portion specifically where the inverter circuit is disposed, the structure offers enhanced vibration resistance and load-bearing capacity at that critical location, counteracting the vibration amplification effect of the thin case while maintaining simplified wiring benefits.
Data Source
AI summary
A co-rotating scroll compressor includes: a driving scroll; a driven scroll, and an inverter circuit disposed on an outer peripheral surface of a housing. On an imaginary plane perpendicular to a driving axis of the driving scroll, a compressive load is generated in a radial direction of the driving scroll. A direction perpendicular to an imaginary line connecting a first contact point and a second contact point at which a driving scroll body comes in contact with a driven scroll body in outermost peripheral portions of the scroll bodies serves as a load direction of the compressive load. The load direction changes within a change range while the driving scroll and the driven scroll make one rotation. The inverter circuit is arranged avoiding the change range in a circumferential direction of the driving scroll.