Compressor Cover Reinforcing Parts for Resonance Noise Reduction
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Solution Overview
Problem
In scroll compressors, pressure pulsation during refrigerant discharge can cause resonance, leading to noise due to cover vibration when the discharge space's natural frequency coincides with the pulsation frequency.
Innovation Solution
The compressor design incorporates reinforcing parts on the cover, specifically oblique ridges or ribs, that extend in a circumferential direction to minimize vibrations at antinodes of the resonance mode, thereby reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the cover is made with a simple structure, then the manufacturing cost is reduced, but the cover vibrates due to resonance causing noise
Solution Approach 1:
The patent applies local quality by adding reinforcing parts (ridges or ribs) at specific locations on the cover where resonance occurs. These reinforcing parts are strategically positioned to address the vibration problem only where needed, rather than making the entire cover more complex. The reinforcing parts increase local stiffness at the resonant areas, effectively reducing noise while maintaining simplicity in the overall cover structure.
2Ease of manufacture
If the cover structure is simplified, then the manufacturing process is easier, but the cover vibrates due to resonance
Solution Approach 1:
The reinforcing parts are designed to be integrated into the cover manufacturing process using local quality enhancement. The ridges or ribs can be formed during the same molding or fabrication process, adding minimal complexity to manufacturing while effectively suppressing resonance-induced noise at critical locations.
3Object-generated harmful factors
If reinforcing parts are added to the cover, then vibrations due to resonance are minimized, but the device complexity increases
Solution Approach 1:
The reinforcing parts are strategically placed only at locations corresponding to antinodes of the resonance mode, which are the specific areas where vibration amplitude is maximum. This localized approach minimizes the addition of structural complexity while achieving effective noise reduction. The reinforcing parts extend in the circumferential direction to optimally counteract the resonance vibrations.
Solution Approach 2:
The patent applies the principle of mechanical vibration by designing the reinforcing parts to counteract the resonant vibrations of the cover. The ridges or ribs increase the natural frequency of the cover structure at critical locations, shifting it away from the excitation frequency caused by periodic refrigerant discharge, thereby eliminating resonance and reducing noise.
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 reinforcing parts effectively suppress cover vibrations and associated noise by aligning with antinodes of the resonance mode, enhancing the structural rigidity and reducing noise levels.
Implementation Method 1
When such pressure pulsation coincides with a natural frequency of the discharge space, resonance may occur in some cases
Implementation Method 2
the cover vibrates due to such resonance so that noise may occur
Data Source
Figure 1
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AI summary
The present invention relates a compressor configured to periodically compress and discharge a fluid to a discharge space reduces noise at a cover due to resonance. The compressor including a rotary shaft rotatably driven, a compressor main body configured to periodically compress and discharge a fluid using rotation of the rotary shaft, and a cover (6) having a cover main body (34) in which a discharge space, into which the fluid discharged from the compressor main body is introduced, is formed and a plurality of reinforcing parts (37) provided on at least one of an outer surface (34a) and an inner surface of the cover main body (34) and extending along at least one of the outer surface and the inner surface thereof.