Compressor, refrigeration apparatus, and refrigerating machine oil
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Solution Overview
Problem
Existing refrigeration systems face challenges with water absorption by insulating members, leading to degradation and potential short circuits due to high water content in refrigerants and oils, particularly with hydrocarbon-based refrigerants like R290, which have low saturated water content, and conventional refrigerating machine oils that absorb excessive water.
Innovation Solution
A compressor design incorporating a refrigerant with a hydrocarbon as the main component and a refrigerating machine oil with a high saturated water content, where the refrigerant has a low saturated water content (<0.3%) and the oil has a saturated water content of 1.8% or more, minimizing water absorption by the insulating members formed from polymers with ester bonds, thus reducing degradation and short circuit risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional refrigerating machine oil is used with hydrocarbon-based refrigerant, then the refrigeration system can operate, but the insulating members absorb excessive water leading to degradation and potential short circuits
Solution Approach 1:
The patent changes the chemical composition parameters of the refrigerating machine oil by specifying it must be a polyalkylene glycol with saturated water content of 1.8% by weight or more. This parameter change ensures the oil can effectively compete with the insulating member for water absorption, thereby protecting the insulating member from water-induced degradation while maintaining reliable refrigeration system operation
Solution Approach 2:
The refrigerating machine oil acts as an intermediary substance that mediates the water absorption competition between the hydrocarbon-based refrigerant and the insulating member. By selecting oil with high saturated water content, it serves as a protective intermediary that absorbs water preferentially, preventing direct water contact and damage to the insulating member
2Reliability
If insulating members made from polymers with ester bonds are used, then electrical insulation is provided, but they are susceptible to water absorption and hydrolysis causing degradation
Solution Approach 1:
The patent converts the potential harm of water presence into a beneficial competition dynamic. Instead of trying to eliminate water completely, it utilizes the high saturated water content of the polyalkylene glycol oil (1.8% or more) to create a competitive water absorption environment where the oil and insulating member vie for water molecules. This converts the harmful effect of water into a controlled competition that ultimately protects the insulating member's chemical stability
Solution Approach 2:
The patent specifies the insulating member must be made from a polymer with ester bonds and changes the operational parameters by controlling the refrigerating machine oil's saturated water content to be 1.8% by weight or more. This parameter change creates optimal conditions where the ester bond-containing insulating member remains chemically stable despite water presence, as the water is competitively absorbed by the high-capacity oil
3Productivity
If hydrocarbon-based refrigerant with low saturated water content is used, then refrigeration efficiency is improved, but water concentration in the system increases relative to other components
Solution Approach 1:
The patent changes the composition parameter of the refrigerating machine oil by specifying it must be a polyalkylene glycol with saturated water content of 1.8% by weight or more. This parameter change creates a water-absorbing sink in the system that balances the low water content of the hydrocarbon refrigerant, effectively managing the relative water concentration and preventing water accumulation issues while maintaining refrigeration efficiency
Solution Approach 2:
The patent applies local quality by creating different water absorption characteristics in different parts of the system. The polyalkylene glycol oil with high saturated water content (1.8% or more) serves as a localized water-absorbing medium that counterbalances the low water content of the hydrocarbon refrigerant, effectively managing water distribution and concentration in the system
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 effectively reduces water absorption by the insulating members, suppressing degradation and preventing short circuits, even under long-term operation, as demonstrated by test results showing extended degradation time of insulating member tensile strength.
Implementation Method 1
the refrigerating machine oil has a saturated water content of 1.8% by weight or more, minimizing water absorption by the insulating members
Data Source
AI summary
A compressor includes a casing, a compression mechanism, and an insulating member. A refrigerating machine oil is stored in the casing. The compression mechanism is housed within the casing. The compression mechanism compresses a refrigerant. The insulating member is housed within the casing. The insulating member is formed of a polymer having an ester bond. The refrigerant includes a hydrocarbon as a main component. The refrigerant has a saturated water content of less than 0.3% by weight. The refrigerating machine oil has a saturated water content of 1.8% by weight or more. A refrigeration apparatus includes the compressor.