Scroll Compressor Bypass Hole Control for R1123 Stability
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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 polyol ester 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 or R1132 is used as a refrigerant to reduce global warming potential, then the GWP is lowered, but the refrigerant stability decreases and disproportionation reactions may occur
Solution Approach 1:
A mixed refrigerant composition is used as an intermediary solution, combining R1123 (or R1132) with other refrigerants (R32, R125, R134a) in specific proportions. This mixture stabilizes the low-GWP refrigerant by preventing disproportionation reactions while maintaining low GWP (65-150), thus resolving the contradiction between reduced global warming potential and maintained refrigerant stability
Solution Approach 2:
The refrigerant composition parameters are precisely controlled within specific ranges (R1123: 30-70 wt%, R32: 10-40 wt%, R125: 10-40 wt%, R134a: 5-20 wt%) to optimize both the stability and GWP properties. By adjusting these compositional parameters, the system achieves a balance between low environmental impact and chemical stability
2Reliability
If a bypass hole is added to the fixed scroll to prevent excessive compression and disproportionation reactions, then refrigerant stability is improved, but device complexity increases
Solution Approach 1:
The bypass hole system operates autonomously based on pressure differential without external control. When compression chamber pressure exceeds discharge chamber pressure, the bypass hole automatically opens to relieve pressure, preventing excessive compression and disproportionation reactions. This self-regulating mechanism improves refrigerant stability while adding minimal structural complexity
Solution Approach 2:
The compression chamber is functionally segmented by the bypass hole, creating a pressure relief pathway that divides the compression process into normal operation and pressure relief modes. This segmentation allows the system to handle extreme pressure conditions separately, maintaining stability without requiring complex control systems
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 maintaining efficient operation.
Implementation Method 1
uses a polyol ester oil as a compressor lubricating oil
Implementation Method 2
a compression chamber which is formed by meshing the fixed scroll and the revolving scroll
Implementation Method 3
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 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 polyol ester oil as a compressor lubricating oil. In addition, 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, are provided. In addition, a discharge hole which is provided at a center position of the end plate of the fixed scroll, and is open to a discharge chamber, a bypass hole which is provided in the end plate of the fixed scroll, and communicates with the compression chamber and the discharge chamber at a timing different from a timing at which the compression chamber communicates with the discharge hole, and a check valve which is provided in the bypass hole, and allows a flow from the compression chamber side to the discharge chamber side.