Scroll Compressor Bypass Valve Layout for Stable R1123 Refrigerant
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Solution Overview
Problem
The high global warming potential of R410A refrigerant and the instability of R1123 and R1132, which can lead to disproportionation reactions, pose challenges for refrigeration cycle devices, affecting their reliability and efficiency.
Innovation Solution
A compressor using R1123 as a working fluid, combined with polyvinyl ether oil and a scroll compressor design featuring a spiral lap configuration, bypass holes, and check valves to manage pressure and prevent disproportionation reactions, along with a refrigeration cycle device configuration that includes a condenser, throttle mechanism, and evaporator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If R1123 is used as a refrigerant to reduce global warming potential, then environmental performance is improved, but the refrigerant stability deteriorates leading to disproportionation reactions
Solution Approach 1:
The patent introduces polyvinyl ether oil as a lubricating oil that acts as an intermediary substance to suppress disproportionation reactions of R1123 refrigerant. The lubricating oil interacts with the refrigerant to prevent the harmful chemical reaction, thereby maintaining refrigerant stability while using the low-GWP refrigerant.
Solution Approach 2:
The patent changes the physical and chemical parameters of the compression system by controlling compression temperature and pressure conditions. By optimizing these parameters, the system prevents disproportionation reactions while maintaining efficient refrigeration performance with R1123.
2Reliability
If compression temperature is reduced to suppress disproportionation reaction, then refrigerant stability is improved, but compression efficiency deteriorates
Solution Approach 1:
The patent optimizes compression parameters including temperature and pressure to find the optimal balance point. By carefully controlling these parameters, the system achieves sufficient suppression of disproportionation reactions while maintaining acceptable compression efficiency for practical refrigeration applications.
3Productivity
If spiral lap configuration is added to scroll compressor to manage pressure, then device complexity increases, but refrigeration performance is improved
Solution Approach 1:
The patent divides the compression chamber into multiple sections using spiral laps on the scroll compressor. This segmentation allows different pressure zones to be managed separately, improving compression efficiency and refrigeration performance while keeping the structural complexity manageable through the inherent scroll design.
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 enhances refrigeration performance, reduces global warming potential, and improves the reliability of the compressor and refrigeration cycle device by suppressing disproportionation reactions and optimizing the refrigerant mixture with R32 or R125, achieving higher cycle efficiency and lower discharge temperatures.
Implementation Method 1
a check valve which is provided in the bypass hole, and allows a flow from the compression chamber side to the discharge chamber side
Implementation Method 2
a fixed scroll and a revolving scroll each having a spiral lap rising from an end plate; and a compression chamber which is formed by meshing the fixed scroll and the revolving scroll
Implementation Method 3
uses a polyvinyl ether oil as a compressor lubricating oil
Implementation Method 4
a condenser which cools a refrigerant gas that is compressed by the compressor and has a high pressure
Implementation Method 5
a throttle mechanism which reduces the pressure of the high-pressure refrigerant which is liquefied by the condenser
Implementation Method 6
an evaporator which gasifies the refrigerant of which the pressure is reduced by the throttle mechanism
Data Source
AI summary
A compressor uses a refrigerant containing R1123 (1,1,2-trifluoroethylene) as a working fluid, and uses a polyvinyl ether oil as a compressor lubricating oil. In addition, a fixed scroll (12) and a revolving scroll (13) each having a spiral lap rising from an end plate, and a compression chamber (15) which is formed by meshing the fixed scroll (12) and the revolving scroll (13), are provided. In addition, a discharge hole (18) which is provided at a center position of the end plate of the fixed scroll (12), and is open to a discharge chamber (31), a bypass hole (68) which is provided in the end plate of the fixed scroll (12), and communicates with the compression chamber (15) and the discharge chamber (31) at a timing different from a timing at which the compression chamber (15) communicates with the discharge hole (18), and a check valve which is provided in the bypass hole (68), and allows a flow from the compression chamber (15) side to the discharge chamber (31) side.