Compressor for refrigeration machine
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Solution Overview
Problem
Refrigerating machine compressors face high costs due to inefficient use of metallic materials in thermal spraying, leading to increased corrosion in harsh environments.
Innovation Solution
A compressor design with a metallic coating applied via thermal spraying, varying in thickness based on the likelihood of corrosion, where the high-pressure part coating is thinner to prevent moisture freezing and the low-pressure and welded parts have thicker coatings for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform thick metallic coating is applied to the entire casing via thermal spraying, then corrosion protection is improved, but material cost increases significantly
Solution Approach 1:
The patent applies different coating thicknesses to different parts of the casing based on their specific corrosion risks. The low-pressure casing part receives a thicker coating (50-100 μm) because it is more prone to corrosion from moisture adhesion and freezing, while the high-pressure casing part receives a thinner coating (10-30 μm) as it is less susceptible to these effects. This local differentiation optimizes material usage while maintaining adequate protection where needed.
2Reliability
If thermal spraying is used to apply metallic coating, then corrosion resistance is improved, but the proportion of attached material to total sprayed material is small leading to high cost
Solution Approach 1:
The patent implements local quality by specifying different coating thicknesses for different casing parts. The low-pressure casing part has a thicker coating (50-100 μm) to protect against corrosion from moisture adhesion and freezing, while the high-pressure casing part has a thinner coating (10-30 μm) since it is less prone to these issues. This approach reduces overall material consumption and cost while maintaining necessary protection levels.
3Reliability
If thick metallic coating is applied to high-pressure casing part, then corrosion protection is improved, but material usage and cost increase unnecessarily
Solution Approach 1:
The patent applies local quality by differentiating coating thickness based on the specific operational conditions of each casing part. The high-pressure casing part, which operates at higher temperatures and is less prone to moisture adhesion and freezing, receives a thinner coating (10-30 μm). This reduces unnecessary material consumption while the low-pressure casing part receives a thicker coating (50-100 μm) where corrosion risk is higher.
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 reduces material usage and costs while effectively preventing corrosion in critical areas, achieving a profound cost reduction and improved durability.
Implementation Method 1
The protective coating is formed by a technique called thermal spraying that sprays a surface of a base material with metallic material that has fluidity produced by melting or the like.
Data Source
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AI summary
A compressor (5A) includes a casing (10) and a metallic coating (50). The casing (10) includes a low-pressure casing part (10a) covering a low-pressure space (71) and a high-pressure casing part (10b) covering a high-pressure space (72). The metallic coating (50) is formed at least on a part of an outer surface of the casing. The metallic coating (50) includes a low-pressure part coating (50a) formed in the low-pressure casing part (10a), a high-pressure part coating (50b) formed in the high-pressure casing part (10b), and a welded part coating (50c) formed in a welded part (10c). At least either the average thickness (Ta) of the low-pressure part coating (50a) or the average thickness (Tc) of the welded part coating (50c) is greater than the average thickness (Tb) of the high-pressure part coating (50b).