Polyoxyalkylene Glycol Lubricant for Refrigerator Compressor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Refrigerator lubricants face challenges in maintaining stability and compatibility with refrigerants like unsaturated fluorinated hydrocarbons, leading to phase separation issues that affect the lifetime and efficiency of refrigeration systems, especially in varying temperature ranges.
Innovation Solution
A lubricant composition using a polyoxyalkylene glycol derivative as the base oil, specifically formulated to maintain compatibility with unsaturated fluorinated hydrocarbon refrigerants, including a combination of unsaturated and saturated fluorinated hydrocarbon compounds, to prevent phase separation and ensure stability across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricants are used with unsaturated fluorinated hydrocarbon refrigerants, then the system can operate, but phase separation occurs at extreme temperatures leading to reduced lifetime and efficiency
Solution Approach 1:
The patent changes the chemical parameters of the lubricant by using polyoxyalkylene glycol derivatives with specific molecular weights (500-3000) and controlled hydroxyl numbers (0.1-10 mg KOH/g). These parameter adjustments ensure the lubricant maintains molecular compatibility with unsaturated fluorinated hydrocarbon refrigerants across extreme temperature ranges, preventing phase separation and improving system reliability.
Solution Approach 2:
The invention employs composite material strategy by formulating lubricants as mixtures of specific polyoxyalkylene glycol derivatives (combining polyethylene glycol and polypropylene glycol components) with controlled molecular weight distributions. This composite approach creates a lubricant composition that resists phase separation with fluorinated hydrocarbon refrigerants better than conventional single-component lubricants.
2Reliability
If the lubricant has high viscosity to ensure lubrication, then movable parts are well-lubricated, but heat exchange efficiency reduces when phase separation occurs in the evaporator
Solution Approach 1:
The patent optimizes the viscosity parameter of the lubricant by selecting polyoxyalkylene glycol derivatives with specific molecular weights (500-3000) that provide adequate lubrication film thickness for movable parts while maintaining low enough viscosity to prevent heat exchange efficiency loss. The controlled molecular weight ensures the lubricant remains in solution with the refrigerant across the operating temperature range, eliminating the trade-off between lubrication and heat exchange 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 lubricant composition provides excellent stability and compatibility with refrigerants, preventing phase separation and enhancing the operational efficiency and lifespan of refrigeration systems, particularly in air-conditioning systems for cars.
Implementation Method 1
the lubricant composition comprises a base oil mainly containing a specific polyoxyalkylene glycol derivative... having excellent compatibility with the refrigerant... preventing phase separation
Data Source
AI summary
Provided is a lubricant composition for a refrigerator, which is characterized by using a substance mainly containing a polyoxyalkylene glycol derivative and having a hydroxyl number of 5 mgKOH/g or less, as a base oil. Also provided is a compressor using such the lubricant composition for a refrigerator. The lubricant composition for a refrigerator is used for a refrigerator which uses a refrigerant having a specific structure such as an unsaturated fluorohydrocarbon and being usable in current air-conditioning systems for cars or the like. The lubricant composition for a refrigerator exhibits excellent compatibility with the refrigerant, while having excellent stability. The compressor uses such the lubricant composition for a refrigerator.