Compressor Sliding Surface Coating for Refrigerant Decomposition Control
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Solution Overview
Problem
Existing compressors face issues with heat generation at sliding portions, leading to refrigerant thermal decomposition and potential compressor failure, which existing solutions like adding antioxidants to refrigeration oil do not adequately address.
Innovation Solution
A compressor design featuring a blend layer with chromium nitride and titanium nitride on sliding surfaces, where the titanium nitride concentration varies regularly in thickness, combined with carbide precipitation on the opposing surface, to efficiently dissipate heat and prevent refrigerant decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antioxidants are added to refrigeration oil to suppress thermal decomposition of refrigerant, then refrigerant decomposition is reduced, but heat generation at sliding portions is not adequately addressed
Solution Approach 1:
The invention applies local quality by creating a blend layer with specific composition (chromium nitride and titanium nitride) at the sliding surface of the compression mechanism part. This localized treatment addresses heat generation at the critical sliding portion without requiring changes to the entire refrigeration oil system. The regular distribution pattern of titanium nitride in the blend layer provides optimized heat dissipation properties exactly where needed.
Solution Approach 2:
The invention uses composite materials by forming a blend layer containing both chromium nitride and titanium nitride on the compression mechanism part surface. This composite coating combines the benefits of both materials to achieve superior heat dissipation and wear resistance, directly addressing the heat generation problem at sliding portions while maintaining refrigerant decomposition suppression.
2Temperature
If sliding components are improved to reduce heat generated by sliding, then heat generation is reduced, but existing solutions do not adequately address refrigerant thermal decomposition
Solution Approach 1:
The invention applies local quality by treating only the sliding surface of the compression mechanism part with a specialized blend layer containing chromium nitride and titanium nitride. This localized approach reduces heat generation at the critical sliding portion while the overall system maintains refrigerant decomposition suppression through the combined effect of reduced heat and the protective coating.
Solution Approach 2:
The invention changes the surface properties of the compression mechanism part by forming a blend layer with specific compositional parameters (chromium nitride and titanium nitride in regular distribution). This parameter change in the surface material properties enables both reduced heat generation and maintained refrigerant decomposition suppression simultaneously.
3Temperature
If a blend layer with chromium nitride and titanium nitride is formed on the compression mechanism part, then heat dissipation is improved, but manufacturing complexity increases
Solution Approach 1:
The invention controls the manufacturing process by specifying precise parameter changes - the regular distribution pattern of titanium nitride in the blend layer. This parameter specification ensures optimal heat dissipation performance while providing clear guidance for manufacturing, balancing performance improvement with manufacturability.
Solution Approach 2:
The invention uses composite materials (chromium nitride and titanium nitride blend layer) that can be applied through established coating technologies. While the composite structure provides superior heat dissipation, the materials and processes are grounded in existing industrial capabilities, managing manufacturing complexity while achieving the desired thermal performance.
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 design effectively reduces heat generation and suppresses refrigerant decomposition, enhancing compressor reliability and longevity by maintaining lubricity and wear resistance.
Implementation Method 1
A blend layer containing chromium nitride and titanium nitride is formed on a surface of the first member. A concentration of the titanium nitride in the blend layer is distributed to increase and decrease regularly in a thickness direction of the blend layer.
Implementation Method 2
Heat is likely to be generated at sliding portions such as a distal end surface of a blade and an outer circumferential surface of a roller in the compressor.
Implementation Method 3
Carbide is precipitated on a surface of the second member.
Implementation Method 4
maintaining lubricity and wear resistance
Data Source
AI summary
A compressor of an embodiment includes a sealed container and a compression mechanism part configured to compress a refrigerant within the sealed container. The refrigerant is an unsaturated refrigerant or a mixed refrigerant containing an unsaturated refrigerant. The compression mechanism part contains chromium. The compression mechanism part includes a first member and a second member. The first member and the second member slide relative to each other. A blend layer containing chromium nitride and titanium nitride is formed on a surface of the first member. The titanium nitride in the blend layer is distributed such that a concentration of the titanium nitride increases and decreases regularly in a thickness direction of the blend layer. Carbide is precipitated on a surface of the second member.