Composition for refrigerator, and refrigerator
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Solution Overview
Problem
Refrigerator oils used in modern refrigeration systems face challenges with thermal stability and oxidation stability, particularly when exposed to high temperatures, leading to potential corrosion and degradation, which existing polyvinyl ether, polyoxyalkylene glycol, and polyol ester compounds may not adequately address.
Innovation Solution
A refrigerator oil composition is developed with a polyvinyl ether or polyoxyalkylene glycol compound having a Hazen color number of 0 to 10, which is achieved through hydrogenation to minimize by-products that contribute to thermal instability and oxidation, thereby enhancing the oil's stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polyvinyl ether, polyoxyalkylene glycol, or polyol ester compounds are used as refrigerator oil, then compatibility with substitute refrigerants (HFC, CO2) is improved, but thermal stability and oxidation stability deteriorate under high temperature conditions
Solution Approach 1:
The patent changes the chemical parameters of the refrigerator oil by specifying precise compositional ratios (polyol ester 5-50 mass%, polyvinyl ether 50-95 mass%, polyoxyalkylene glycol 5-95 mass%) and molecular weight ranges to achieve optimal balance between refrigerant compatibility and thermal/oxidation stability. This parameter optimization resolves the contradiction by finding the precise compositional sweet spot.
Solution Approach 2:
The patent creates a composite refrigerator oil formulation by combining multiple lubricant types (polyol ester, polyvinyl ether, polyoxyalkylene glycol) in specific ratios. This composite approach leverages the strengths of each component: polyol ester provides refrigerant compatibility, while polyvinyl ether and polyoxyalkylene glycol contribute to thermal and oxidation stability, respectively.
2Volume of moving object
If the amount of refrigerator oil is decreased to reduce equipment size, then equipment compactness is improved, but the severity of use conditions increases leading to greater thermal decomposition
Solution Approach 1:
The patent changes the quality parameters of the refrigerator oil (compositional ratios, molecular weights, viscosity characteristics) to enhance its intrinsic thermal stability. This allows the oil to withstand severe use conditions with reduced oil quantity, resolving the contradiction between equipment compactness and thermal stability.
Solution Approach 2:
This principle is applied inversely - instead of using more oil to compensate for instability, the patent creates a highly stable, concentrated formulation that lasts longer and performs better with less quantity, effectively making the oil more durable and efficient.
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 composition effectively suppresses degradation, acid value increase, and metal corrosion under high temperature conditions, ensuring improved thermal and oxidation stability of the refrigerator oil.
Implementation Method 1
A refrigerator oil composition is developed with a polyvinyl ether or polyoxyalkylene glycol compound having a Hazen color number of 0 to 10, which is achieved through hydrogenation to minimize by-products that contribute to thermal instability and oxidation
Data Source
AI summary
A refrigerator oil that is excellent in thermal stability and oxidation stability is provided. The refrigerator oil contains at least one compound selected from the group consisting of a polyvinyl ether compound, a polyoxyalkylene glycol compound, and a polyol ester compound and has a Hazen color number according to ASTM D1209-05 of 0 to 10.