Compressor and heat cycle system for refrigerator
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Solution Overview
Problem
Hydrofluoroolefins like HFO-1123 used in heat cycle systems are prone to self-decomposition reactions at high temperatures or pressures, which can be triggered by ignition energy, posing a risk in compressors where sparks may occur.
Innovation Solution
A compressor design with a sealed container, oil reservoir, electric drive part, and power source terminal where the internal terminal is immersed in lubricating oil to prevent sparking and subsequent self-decomposition reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO-1123 is used as a working medium to reduce ozone depletion and global warming impact, then environmental compatibility is improved, but the risk of self-decomposition reaction increases due to ignition energy in the compressor
Solution Approach 1:
The patent introduces an intermediary substance (insulating oil or inert gas) between the power source terminal and the HFO-1123 working medium. This intermediary prevents direct contact between the ignition energy from the power source terminal and the HFO-1123, thereby eliminating the risk of self-decomposition reaction while allowing the use of environmentally friendly HFO-1123 as the working medium.
2Device complexity
If the power source terminal is positioned to pass through the sealed container wall in the oil reservoir part, then electrical connection is simplified, but the risk of spark generation increases
Solution Approach 1:
The patent creates an inert environment by filling the oil reservoir part with insulating oil or inert gas. The power source terminal passes through this inert medium, which prevents spark generation even when the terminal penetrates the sealed container wall. This allows simplified electrical connection while maintaining safety.
3Productivity
If HFO-1123 is used alone as a working medium to achieve excellent cycle performance, then refrigerating capacity is improved, but noncombustibility deteriorates
Solution Approach 1:
The patent extracts the ignition source (spark risk from power source terminal) from the system by introducing physical barriers (insulating oil, inert gas layer) between the electrical components and the HFO-1123 working medium. This allows HFO-1123 to be used alone to achieve excellent refrigerating capacity while the extracted ignition risk is isolated and eliminated.
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
Prevents self-decomposition reactions of the working medium by eliminating sparks within the compressor, ensuring stable operation even with HFO-based working media.
Implementation Method 1
the internal terminal being immersed in lubricating oil to prevent sparking
Data Source
AI summary
A compressor includes a sealed container, a compression part provided in an upper part of the inside of the sealed container and configured to compress a working medium, an oil reservoir part provided in a bottom part of the inside of the sealed container and configured to reserve a lubricating oil therein, an electric drive part provided between the compression part and the oil reservoir part inside the sealed container and configured to drive the compression part, and a power source terminal provided to pass through a wall surface of the sealed container in a region of the oil reservoir part. The power source terminal is connectable to an external power source outside the sealed container and electrically connected to the electric drive part via a lead wire in the sealed container.