Vehicle A/C Service Gas Analysis With an Evacuable Oil Separator
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Solution Overview
Problem
Service devices for vehicle air conditioning systems face challenges in maintaining accurate refrigerant gas analysis due to the presence of compressor oil, leading to malfunctions and fluctuating analysis values, which can result in incorrect refrigerant use and system compatibility issues.
Innovation Solution
Incorporating a gas analysis connection with an oil separator that can be evacuated and temporarily connected to an evacuation device, allowing for the separation of refrigerant from compressor oil components, thereby protecting the system from non-compatible refrigerants and oils and improving analysis accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If refrigerant gas analysis is performed directly from the refrigerant circuit system, then analysis can be conducted, but compressor oil contaminates the gas analyzer causing malfunctions and fluctuating analysis values
Solution Approach 1:
The patent introduces an intermediary oil separator between the refrigerant circuit system and the gas analyzer. This separator acts as a mediator that removes compressor oil from the refrigerant gas stream before it reaches the analyzer, protecting the analyzer from contamination while allowing accurate refrigerant composition analysis to proceed
Solution Approach 2:
The patent extracts the harmful compressor oil component from the refrigerant gas mixture using an oil separator. By removing the oil phase separately before analysis, the gas analyzer receives only clean refrigerant gas, eliminating the source of measurement errors and instrument contamination
2Loss of substance
If a compressor oil separator is used to separate refrigerant from compressor oil, then refrigerant can be recovered for reuse, but the system requires additional equipment and complexity
Solution Approach 1:
The patent designs the oil separator to serve multiple functions: it separates compressor oil from refrigerant for recovery purposes, provides refrigerant gas analysis capability, and protects downstream equipment. By combining these functions in one component, the patent reduces overall system complexity while achieving refrigerant recovery
Solution Approach 2:
The patent merges the gas analysis connection directly into the oil separator structure. This integration allows the separator to simultaneously perform oil removal and refrigerant composition analysis without requiring separate equipment, thereby reducing device complexity while maintaining refrigerant recovery capability
3Measurement precision
If gas analysis connection is integrated with oil separator, then analysis accuracy improves, but the system requires evacuation capability adding operational complexity
Solution Approach 1:
The patent implements preliminary evacuation of the oil separator and gas analysis connection before performing gas analysis. This preliminary action removes air and moisture from the system, ensuring that subsequent refrigerant gas analysis is not contaminated by atmospheric gases, thereby maintaining high measurement precision
Solution Approach 2:
The evacuation system is integrated into the oil separator assembly, allowing the separator to be self-evacuated as part of the normal operation sequence. This self-service capability reduces the need for external evacuation equipment and simplifies operational procedures while maintaining analysis accuracy
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
This solution effectively separates the majority of the refrigerant from compressor oil components with minimal effort, significantly reducing gas analyzer malfunctions and fluctuating analysis values without extensive maintenance, and can be retrofitted into existing systems.
Implementation Method 1
an oil separator (156) in which, in a first operational state, the gas analysis connection (161A) is fluidly connected to the low-pressure line
Implementation Method 2
which can be connected to an evacuation device (150) in a second operational state
Data Source
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AI summary
The invention relates to a servicing device for vehicle air-conditioning systems comprising an evacuation assembly for withdrawing the coolant/compressor oil mixture from the coolant circuit of a vehicle air-conditioning system and comprising a coolant gas analyser. In said device, a gas analysis connection (161A) is provided on or in at least one of the connection lines between the servicing device (100) and the vehicle air-conditioning system. Said gas analysis connection is fluidically connected or can be fluidically connected to the coolant gas analyser (161) via an oil separator (156) that can be evacuated and that is connected at least at intervals to an evacuation assembly.