Motor Compressor Cover Recess Design for Vibration Control
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Solution Overview
Problem
Motor-driven compressors face challenges in reducing noise and size while maintaining durability, as existing designs either increase noise through vibration transmission or enlarge the compressor due to rib protrusions, which can lead to corrosion and weight issues.
Innovation Solution
The design incorporates a cover with a plate-shaped body wall featuring a first thickness portion and recessed second thickness portions around insertion holes, reducing vibration transmission and preventing foreign matter deposition, thus minimizing noise and size without enlarging the compressor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ribs protrude from the first surface toward the inverter to increase body wall rigidity, then vibration transmission to the cover is limited, but the accommodation chamber size is reduced and interference between ribs and inverter occurs
Solution Approach 1:
Instead of protruding ribs from the first surface toward the inverter, the patent inverts the approach by forming recesses in the first surface that extend toward the second surface. This inversion maintains the rigidity-enhancing function while eliminating space occupation in the accommodation chamber, thus preventing interference with the inverter and maintaining adequate chamber volume.
Solution Approach 2:
The patent applies local quality by creating recesses only in specific locations on the body wall where rigidity enhancement is needed, rather than using uniform rib structures across the entire surface. This localized approach optimizes structural strength while minimizing impact on accommodation chamber volume.
2Volume of stationary object
If ribs protrude from the second surface to avoid interference with the inverter, then accommodation chamber size is maintained, but foreign matter deposition increases and corrosion resistance decreases
Solution Approach 1:
The patent inverts the conventional rib protrusion approach by creating recesses in the first surface instead of protrusions on the second surface. This inversion prevents foreign matter accumulation while maintaining body wall rigidity, thereby improving corrosion resistance and overall reliability.
Solution Approach 2:
The patent converts the potential harm of surface irregularities into a benefit by designing recesses that are sealed and positioned to prevent foreign matter entry, rather than creating open protrusions that would trap contaminants and accelerate corrosion.
3Strength
If the accommodation chamber is enlarged to avoid rib-inverter interference, then rib protrusion from the first surface is possible, but the cover and motor-driven compressor are enlarged in the axial direction
Solution Approach 1:
The patent inverts the rib structure approach by using recesses instead of protrusions, which eliminates the need to enlarge the accommodation chamber. This allows the compressor to maintain a compact axial length while still achieving the desired body wall rigidity for vibration reduction.
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 effectively reduces noise and weight while maintaining durability by absorbing vibrations and preventing corrosion, without compromising the accommodation chamber size.
Implementation Method 1
the rigidity of the body wall is increased by the ribs. This limits situations in which the vibration of the housing is transmitted to the cover
Data Source
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AI summary
A motor-driven compressor includes a compression mechanism, an electric motor, an inverter, a housing, and a cover defining an accommodation chamber with the housing to accommodate the inverter. The cover includes a plate-shaped body wall and insertion holes extending through a periphery of the body wall. The body wall includes a first surface opposed to the inverter in the accommodation chamber, a second surface, a first thickness portion having a first thickness, and a second thickness portion located around at least one of the insertion holes. The second thickness portion has a second thickness that is smaller than the first thickness and is obtained by recessing the body wall from the first surface toward the second surface.