Refrigerator Lubricating Oil Composition Preventing Phase Separation
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Solution Overview
Problem
Lubricating oils for refrigerators using fluorine-containing organic compounds with specific polar structures face challenges in maintaining compatibility, stability, and preventing phase separation across wide temperature ranges, which affects the efficiency and lifespan of refrigeration systems.
Innovation Solution
A lubricating oil composition utilizing a specific oxygen-containing compound as the base oil, combined with fluorine-containing organic compounds and saturated fluorinated hydrocarbons, to ensure compatibility and stability with refrigerants, thereby preventing phase separation and enhancing sealing properties and friction reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional lubricating oils are used with fluorine-containing refrigerants having polar structures, then the lubricating oil can provide basic lubrication, but phase separation occurs at low and high temperatures reducing system efficiency and component lifetime
Solution Approach 1:
The patent changes the chemical parameters of the lubricating oil by selecting base oils with specific molecular structures (polyolester, polyalphaolefin, or mineral oil) that have compatible polarity and molecular characteristics with fluorine-containing refrigerants. This parameter matching prevents phase separation across the operating temperature range of -40°C to 100°C while maintaining lubrication effectiveness.
Solution Approach 2:
The patent creates a composite lubricating system by combining specifically selected base oils with additive packages designed to enhance compatibility with fluorine-containing refrigerants. The composite formulation ensures uniform mixing and prevents phase separation, thereby improving system reliability and preventing compressor damage.
2Reliability
If the lubricating oil maintains viscosity at low temperatures, then sealing property improves, but friction increases in sliding parts
Solution Approach 1:
The patent applies local quality by using viscosity index improvers and friction modifiers in the additive package that specifically address the sliding surfaces and sealing interfaces. These additives create a protective film with optimal viscosity characteristics at the contact points, ensuring good sealing without excessive friction in moving parts.
Solution Approach 2:
The patent modifies the viscosity-temperature characteristics of the lubricating oil by selecting base oils with appropriate viscosity indices and adding viscosity modifiers. This allows the oil to maintain sufficient viscosity for sealing at low temperatures while reducing viscosity at operating temperatures to minimize friction in sliding parts.
3Duration of action of stationary object
If the lubricating oil provides excellent lubrication at high temperatures, then component lifetime increases, but phase separation with refrigerant occurs reducing heat exchange efficiency
Solution Approach 1:
The patent selects base oils with high thermal stability parameters and appropriate pour points to maintain lubrication at high temperatures without degrading or separating from the refrigerant. The additive package includes high-temperature antioxidants and stability enhancers that protect both the oil and refrigerant from degradation, ensuring long component life and maintained heat exchange efficiency.
4Object-affected harmful factors
If natural refrigerants like carbon dioxide are used to reduce global warming potential, then environmental protection improves, but high pressure requirements make them incompatible with current car air conditioner systems
Solution Approach 1:
The patent changes the pressure parameters of the refrigeration system by using fluorine-containing refrigerants with moderate pressure characteristics that are compatible with existing car air conditioner systems. These refrigerants maintain low global warming potential while operating within the pressure design parameters of current systems, eliminating the need for high-pressure infrastructure.
Data Source
AI summary
The invention relates to a composition for a refrigerator and comprises a refrigerant and a lubricating oil composition. The refrigerant includes at least one kind of fluorine-containing organic compounds selected from the following formula (A): CpOqFrRs, wherein p, q, r, s and R are as defined in the application. The lubricating oil composition comprises a base oil including as a main component at least one kind of oxygen-containing compounds selected from polyvinyl ethers and polyol esters.