Compressor and refrigeration device provided with compressor
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Solution Overview
Problem
The use of HFO1234ze refrigerant with polyol ester oil in compressors leads to insufficient prevention of deterioration in sliding parts made of polyamide resin, affecting reliability.
Innovation Solution
The compressor employs L-PPS resin for sliding parts, which has increased molecular weight and improved strength, preventing deterioration when used with HFO1234ze refrigerant and polyol ester oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamide resin is used for the sliding part in combination with HFO1234ze refrigerant and polyol ester oil, then the sliding part can provide basic lubrication function, but the sliding part deteriorates over time affecting reliability
Solution Approach 1:
The patent changes the material parameter from polyamide resin to L-PPS resin (linear polyphenylene sulfide resin), which has superior chemical stability and resistance to polyol ester oil. This material substitution resolves the deterioration issue while maintaining the sliding part's functional properties.
Solution Approach 2:
The patent employs L-PPS resin as a composite material solution that combines high mechanical strength, chemical inertness to refrigerant and oil combinations, and wear resistance. This composite material approach provides both durability and stability in the sliding part.
2Strength
If conventional PPS resin is used for the sliding part, then the material provides good chemical resistance, but the molecular weight is insufficient leading to inadequate strength
Solution Approach 1:
The patent specifically uses L-PPS resin with increased molecular weight compared to conventional PPS resin. This parameter change in molecular weight directly enhances the mechanical strength and durability of the sliding part while maintaining chemical resistance properties.
Data Source
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Figure 3
AI summary
A provided compressor is a compressor to be used in a refrigerant circuit that uses a single-component refrigerant of HFO1234ze or a refrigerant mixture containing HFO1234ze and uses a polyol ester oil as a refrigerating machine oil. The compressor includes a rotary shaft, and a sliding unit including a sliding part sliding with another part with rotation of the rotary shaft. The sliding part is made of an L-PPS resin obtained by increasing molecular weight of a PPS resin in a straight chain.