Electric compressor and refrigeration/air conditioning device
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Solution Overview
Problem
The use of polyvinyl ether oil in refrigeration air-conditioning systems with hydrofluoroolefin refrigerants leads to reduced thermochemical stability and poor lubrication performance, resulting in increased friction loss and decreased fatigue life of bearings in electric compressors, especially when combined with tertiary phosphate, which is decomposed and consumed.
Innovation Solution
Incorporating a refrigerant with 20% or more hydrofluoroolefin and using polyvinyl ether oil as the refrigerator oil, supplemented with an alicyclic epoxy compound and tertiary phosphate in amounts between 0.1% to 2.0% by mass, to enhance lubrication and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyvinyl ether oil is used as refrigerator oil with hydrofluoroolefin refrigerant, then electrical insulating properties are improved, but thermochemical stability of hydrofluoroolefin is reduced
Solution Approach 1:
An alicyclic epoxy compound is introduced as an intermediary substance between polyvinyl ether oil and hydrofluoroolefin refrigerant. The alicyclic epoxy compound (0.01-5% by mass) acts as a stabilizer that prevents the negative chemical interaction between polyvinyl ether oil and hydrofluoroolefin, thereby maintaining both electrical insulating properties and thermochemical stability of the refrigerant mixture.
2Reliability
If polyvinyl ether oil is used as refrigerator oil, then electrical insulating properties are improved, but lubrication performance is poor leading to increased friction loss
Solution Approach 1:
The refrigerator oil is formulated as a composite mixture containing polyvinyl ether oil (60-99% by mass) combined with an alicyclic epoxy compound (0.01-5% by mass) and an aliphatic epoxy compound (0.01-5% by mass). This composite formulation maintains the excellent electrical insulating properties of polyvinyl ether oil while the epoxy compounds contribute to improved lubrication performance, reducing friction loss in the electric compressor.
3Loss of energy
If tertiary phosphate is added to polyvinyl ether oil to improve lubrication, then lubrication performance is improved, but tertiary phosphate is decomposed and consumed
Solution Approach 1:
The alicyclic epoxy compound and aliphatic epoxy compound serve as protective intermediaries that prevent the decomposition of tertiary phosphate when used in combination with polyvinyl ether oil and hydrofluoroolefin. These epoxy compounds stabilize the chemical environment, allowing tertiary phosphate to maintain its lubrication-enhancing properties without being decomposed and consumed, thereby ensuring sustained product reliability.
4Reliability
If polyvinyl ether oil is used with hydrofluoroolefin, then electrical insulating properties are improved, but fatigue life of bearing is decreased
Solution Approach 1:
The refrigerator oil is formulated as a composite containing polyvinyl ether oil (60-99% by mass), an alicyclic epoxy compound (0.01-5% by mass), and an aliphatic epoxy compound (0.01-5% by mass). This composite formulation maintains the electrical insulating properties of polyvinyl ether oil while the epoxy compounds provide protective lubrication that reduces wear and extends the fatigue life of bearings in the electric compressor.
Data Source
Figure 1~2
Figure 3
AI summary
The electric compressor (3) according to the present invention includes, in a sealed container (25), a compression mechanism (33) to compress a refrigerant and an electric motor (24) to drive the compression mechanism (33), in which the refrigerant contains 20% by mass or more of hydrofluoroolefin, and a refrigerator oil stored in the sealed container (25) contains polyvinyl ether as a base oil, an alicyclic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil, an aliphatic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil, and tertiary phosphate in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil.