Compressor Bottom Cover and Bearing Block Reinforcement for Noise Reduction
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Solution Overview
Problem
Compressors experience significant noise radiation from the space where the lower bearing is located, which is defined by the motor and the lower housing, due to internal part excitation and vibration.
Innovation Solution
The compressor housing is enhanced with a cylindrical reinforcing part, typically formed by an axial extension part or a reinforcement member, which increases rigidity and damping to reduce noise radiation. This is achieved through interference fitting or welding the axial extension part to the cylindrical body, or using a separate reinforcement member made of different material, with specific gaps and support structures to enhance rigidity and damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing structure is simplified for easier manufacturing, then manufacturing cost and complexity are reduced, but noise radiation from the bearing space increases
Solution Approach 1:
The housing structure applies local quality enhancement by adding a cylindrical reinforcing part specifically at the bearing block space where noise radiation is most severe. This reinforcement is not applied uniformly throughout the entire housing but only at the critical location, thus improving noise reduction locally while maintaining manufacturing simplicity overall. The reinforcing part increases wall thickness or adds structural elements only where needed to reduce vibration and noise from the bearing area.
Solution Approach 2:
The housing may utilize composite material structures or composite construction methods by combining the base housing material with reinforcing materials or structures. The cylindrical reinforcing part could be made of different material properties than the main housing, creating a composite structure that optimizes both acoustic performance and manufacturing ease. This allows the housing to achieve superior noise reduction characteristics without significantly complicating the overall manufacturing process.
2Object-generated harmful factors
If the housing wall thickness is increased to reduce noise, then noise radiation is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of uniformly increasing wall thickness throughout the entire housing, the invention applies localized reinforcement only at the cylindrical reinforcing part corresponding to the bearing block space. This selective approach increases noise reduction where it is most needed while avoiding the unnecessary complexity and cost of thickening the entire housing structure. The local quality principle ensures that structural enhancements are concentrated at critical noise sources rather than distributed uniformly.
Solution Approach 2:
The housing structure is segmented into distinct functional zones: the cylindrical reinforcing part with enhanced noise reduction properties and the rest of the housing with standard construction. This segmentation allows the complex reinforced section to be designed and manufactured as a separate modular component that can be integrated into the overall housing, thereby reducing overall manufacturing complexity compared to redesigning the entire housing structure.
3Object-generated harmful factors
If a cylindrical reinforcing part is added to the housing, then noise radiation is reduced, but manufacturing process becomes more complex
Solution Approach 1:
The cylindrical reinforcing part is merged with the housing structure through interference fit or integral forming, creating a unified component that combines the housing and reinforcement into a single manufactured assembly. This merging approach eliminates the need for separate assembly steps involving multiple parts, thereby reducing manufacturing complexity despite adding noise reduction functionality. The reinforcing part becomes an integrated feature of the housing rather than a separate additive component.
Solution Approach 2:
The cylindrical reinforcing part is designed to be formed or prepared in advance as a pre-assembled component with specific geometric features (such as interference fit surfaces) that facilitate straightforward integration into the housing. This preliminary preparation of the reinforcing element simplifies the overall manufacturing process by allowing standardized production of the reinforcement component that can be consistently and efficiently integrated into different housing units.
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 enhanced housing structure significantly reduces noise radiation while simplifying manufacturing processes and lowering costs by increasing the rigidity and damping of the compressor components.
Implementation Method 1
The axial extension part is interference-fitted in the cylindrical body to form the cylindrical reinforcing part of the housing
Implementation Method 2
The enhanced housing structure significantly reduces noise radiation while simplifying manufacturing processes and lowering costs by increasing the rigidity and damping of the compressor components
Data Source
AI summary
A compressor includes: a housing including a cylindrical body, and a first cover and a second cover which are respectively arranged at two axial ends of the cylindrical body; a compression mechanism accommodated in the housing and constructed to compress a working fluid; a crankshaft constructed for driving the compression mechanism; a motor constructed to drive the crankshaft to rotate; and a bearing block accommodated in a space defined by the motor and the housing and fixedly attached to the housing, wherein the bearing block is constructed to rotatably support the crankshaft by means of a bearing. The housing is provided with a cylindrical reinforcing portion used for defining a space, and the rigidity of the cylindrical reinforcing portion being greater than that of other parts of the housing. The structure can significantly reduce noise radiation and reduce manufacturing processes and costs.