Ducted Oil Separator with Horizontal Bends to Reduce Pressure Drop
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Solution Overview
Problem
Conventional oil separators in cooling systems, such as air conditioning and refrigeration, face inefficiencies due to reliance on gas velocity and the need for large vessel sizes, which can lead to high pressure drops and reduced system efficiency, while also allowing excessive oil carryover.
Innovation Solution
An oil/gas separator design featuring a duct with horizontal bends and a centrifugal cylinder for oil collection, eliminating the vortex finder and incorporating a baffle for enhanced separation, allowing for efficient oil removal without relying on high gas velocities, and optimizing size and pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oil separators use large vessel sizes to improve separation efficiency, then oil separation performance is improved, but pressure drop increases and system efficiency decreases
Solution Approach 1:
The patent employs a curved duct with horizontal bends instead of straight sections to enhance centrifugal separation of oil from gas. The curvature creates centrifugal forces that improve separation efficiency without requiring large vessel sizes, thereby maintaining acceptable pressure drops while achieving reliable oil separation.
Solution Approach 2:
The patent changes the geometric parameters of the duct, specifically incorporating horizontal bends with optimized curvature radii and angles. This parameter modification enhances the centrifugal effect on oil-gas mixture, improving separation performance without increasing overall vessel size or excessive pressure loss.
2Reliability
If conventional oil separators rely on high gas velocity to improve separation, then separation efficiency is improved, but pressure drop increases and system efficiency decreases
Solution Approach 1:
The curved duct configuration generates centrifugal forces that act on the oil-gas mixture regardless of gas velocity magnitude. This allows effective separation at lower velocities compared to conventional straight-duct separators, reducing the pressure drop penalty while maintaining separation efficiency.
3Device complexity
If conventional oil separators use standard designs with vortex finders, then separation process is simplified, but oil carryover increases and separation efficiency decreases
Solution Approach 1:
The patent removes the vortex finder component from the conventional cyclone separator design. This extraction eliminates the re-entrainment issue that causes oil carryover, while the curved duct configuration provides sufficient separation functionality without requiring the vortex finder, thus maintaining design simplicity while improving oil separation reliability.
4Volume of moving object
If duct size is reduced to improve compactness, then installation space is reduced, but separation efficiency decreases and oil carryover increases
Solution Approach 1:
The curved duct configuration maximizes the centrifugal effect within a compact volume. By optimizing the curvature radius and bend angle, the design achieves effective oil-gas separation in a smaller footprint compared to conventional straight-duct separators, maintaining separation efficiency while reducing overall separator size for compact installation.
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 design achieves significantly lower oil carryover (0.5% or less) and improved efficiency per unit size, with manufacturing simplicity and operation across a wide range of conditions, enhancing cooling system performance.
Implementation Method 1
the duct providing at least partial separation of the oil/gas mixture, in use, by both gravitational and centrifugal oil collection onto the inner surface
Implementation Method 2
the duct providing at least partial separation of the oil/gas mixture, in use, by both gravitational and centrifugal oil collection onto the inner surface
Data Source
AI summary
A ducted separator in a compressor-based cooling assembly is connected to an oil/gas outlet of the compressor. The ducted separator is a pipe with at least one bend in it which collects oil in a manner which can achieve 98% oil carry over efficiency. The ducted separator may optionally be connected to a second phase separator such as a centrifugal cylinder. In that case, the height of the centrifugal cylinder can be significantly reduced compared with conventional arrangements. Alternatively, a simpler impingement surface such as one or more baffles may be used as the second phase separator or just a collection chamber.