Compressor for refrigeration and air conditioning, and refrigeration and air conditioning device
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Solution Overview
Problem
Conventional polyol ester-based refrigerator oils lack compatibility and high viscosity when used with difluoromethane, leading to inadequate lubrication and efficiency in refrigeration and air conditioning devices, and increasing the chain length of polymers compromises compatibility and heat dissipation.
Innovation Solution
A compressor using a polyol ester with a structural unit represented by the general formula, where R1 and R2 are linear or branched alkyl groups, and n is 2 or more, forming cyclic or crosslinked polyol esters to achieve a kinematic viscosity of 30 mm2/s to 100 mm2/s at 40°C, ensuring compatibility and high viscosity without compromising heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyol ester-based refrigerator oil is used with difluoromethane, then the refrigerator oil and refrigerant can be mixed, but the compatibility is low and viscosity is insufficient leading to inadequate lubrication
Solution Approach 1:
The patent changes the chemical parameters of the polyol ester by specifying a particular structural formula with defined R1, R2 alkyl groups and n value (2-10), transforming conventional polyol esters into a specialized structure that achieves both high viscosity (30-100 mm²/s at 40°C) and full miscibility with difluoromethane, thereby simultaneously improving lubrication performance and compatibility
Solution Approach 2:
The patent creates a composite lubricant system by combining the specifically structured polyol ester with difluoromethane refrigerant, where the unique molecular structure of the polyol ester (with specific R1, R2 groups and n values) ensures optimal interaction between the lubricant and refrigerant phases, achieving both high viscosity for lubrication and complete miscibility for system compatibility
2Reliability
If the chain length of polymer is increased to achieve high viscosity, then lubrication performance improves, but compatibility with difluoromethane deteriorates and heat dissipation is compromised
Solution Approach 1:
The patent precisely controls the chain length parameter by defining n as an integer from 2 to 10 in the polyol ester structure, and controls the kinematic viscosity to be 30-100 mm²/s at 40°C, achieving optimal lubrication performance while maintaining complete miscibility with difluoromethane and adequate heat dissipation capabilities
Solution Approach 2:
The patent optimizes specific local structural parameters of the polyol ester (the R1 and R2 alkyl groups and the n value in the repeating unit) to achieve the desired balance between viscosity and compatibility, rather than simply increasing overall chain length, thereby maintaining both lubrication performance and refrigerant miscibility
3Ease of operation
If conventional refrigerator oil is used, then the compressor can operate, but the refrigerator oil separates from refrigerant locally preventing contact with sliding section
Solution Approach 1:
The patent changes the chemical parameters of the refrigerator oil to achieve complete miscibility with difluoromethane, ensuring uniform distribution and contact with sliding sections, thereby maintaining compressor operation while significantly improving durability through adequate lubrication
4Ease of operation
If conventional refrigerator oil is used, then the compressor can function, but the refrigerator oil aggregates in pipes and is retained in refrigeration cycle
Solution Approach 1:
The patent modifies the physical and chemical parameters of the refrigerator oil through the specific polyol ester structure, achieving complete miscibility with difluoromethane that prevents aggregation in pipes and retention in the refrigeration cycle, thereby maintaining compressor function while improving system efficiency and COP
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 solution provides a compressor and refrigeration device with improved environmental performance and efficiency by achieving favorable compatibility and high viscosity with difluoromethane, maintaining lubrication and heat dissipation while adhering to environmental regulations.
Implementation Method 1
a refrigerator oil is used. The refrigerator oil plays various roles such as lubrication of a sliding section
Implementation Method 2
cooling of an electric motor
Implementation Method 3
hermetical sealing of a refrigerant inside the compressor
Implementation Method 4
the refrigerator oil having a planar molecular structure in which a plurality of molecular chains are oriented in an axial direction when an external force is applied, exhibits a high viscosity
Data Source
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AI summary
The present invention provides a compressor for refrigeration and air conditioning and a refrigeration and air conditioning device capable of achieving both favorable environmental performance and favorable refrigeration cycle efficiency. In the compressor for refrigeration and air conditioning, a refrigerator oil containing a polyol ester and a refrigerant containing difluoromethane are enclosed. The polyol ester has two or more repetitions of poly[2,2-di(alkanoyloxymethyl)oxytrimethylene] as a structural unit. Further, the polyol ester is composed of only one or both of a cyclic polyol ester, which is obtained by cyclically polymerizing a molecular chain having the structural unit, and a crosslinked polyol ester, which is obtained by crosslinking molecular chains having the structural unit with each other through a crosslinkable structural unit polymerized with the structural unit.