Integrated Vortex Separator for Aircraft Waste Systems
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Solution Overview
Problem
Vacuum waste systems on aircraft face challenges in separating solid and liquid waste effectively from the airstream, which often contains moisture, leading to potential blockages in vent lines due to condensation or freezing, and the airstream should be free of both solid particles and moisture for sanitary and operational reasons.
Innovation Solution
An integrated vortex separator (IVS) with multiple stages, including centrifugal vortex flow, conical structures, radial vanes, and additional filtering media, effectively separates solid and liquid waste from the airstream, trapping moisture and allowing a substantially moisture-free airstream to be expelled, while also incorporating a demister system to further remove moisture before venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-stage vortex separator is used, then the device complexity is reduced, but the moisture removal efficiency is insufficient leading to potential blockages
Solution Approach 1:
The vortex separator is divided into multiple stages: a first vortex separator stage for initial solid-liquid separation, a second vortex separator stage for further moisture removal, and a demister stage for final moisture elimination. This segmentation allows each stage to specialize in specific separation tasks, achieving high moisture removal efficiency while managing complexity through modular design
Solution Approach 2:
The patent employs nested conical structures where an inner cone is positioned within an outer cone, creating annular flow paths. The inner cone of one stage can serve as the outer structure of the next stage, allowing multiple separation functions to be integrated within a compact nested arrangement, thus improving efficiency without proportionally increasing overall device complexity
2Reliability
If multiple vortex separator stages are added, then moisture removal efficiency is improved, but the device complexity increases
Solution Approach 1:
Multiple vortex separator stages and the demister are integrated into a single unified apparatus with common housing and shared structural elements. The stages are arranged sequentially within the same device envelope, merging multiple separation functions into one compact unit that achieves high moisture removal efficiency without requiring separate standalone components for each stage
Solution Approach 2:
The conical structures and radial vanes serve multiple functions: they generate vortex flow for separation, define flow paths between stages, and provide structural support. The inner cones serve both as separation surfaces and as structural boundaries for the annular flow channels, reducing the need for additional dedicated components and thereby managing complexity
3Reliability
If the radial vanes are set at steeper angles, then the vortex flow intensity increases improving separation, but the moisture may not drop out effectively
Solution Approach 1:
The radial vanes are positioned at specific angles (10-45 degrees from vertical) to dynamically balance vortex generation and moisture dropout. The vane angles are optimized to create sufficient centrifugal force for separation while maintaining flow conditions that allow moisture to coalesce and drop effectively, achieving both separation efficiency and moisture removal without requiring adjustable mechanisms
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 IVS efficiently separates solid and liquid waste from the airstream, ensuring the airstream is free of moisture and particles, preventing blockages and maintaining system functionality, even at varying altitudes where pressure differentials change.
Implementation Method 1
the waste stream is drawn into a centrifugal vortex flow around the outer housing to facilitate the removal of solid and liquid waste from the waste stream
Implementation Method 2
the centrifugal vortex flow is redirected into a conical cavity defined by outer and inner inverted conical structures to remove additional liquid components from the primary airstream
Implementation Method 3
The third stage includes additional filtering media within the inner cone for removing any remaining moisture or waste components from the secondary airstream
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An integrated vortex separator (116) (IVS) is disclosed. The IVS (116) includes a housing (202) in communication with a waste inlet via which a waste stream is drawn under suction into a waste tank (102). In a first stage, the waste stream is drawn into a centrifugal vortex flow to facilitate the removal of solid and liquid waste from the waste stream, leaving a primary airstream. Within the housing (202), a filter assembly includes outer and inner inverted cones with a conical cavity therebetween, the cavity serving as a second stage into which the vortex flow is redirected to remove additional liquid from the airstream. Radial vanes (210) extending inward from the outer cone define portals between adjacent vanes, through which the redirected vortex flow is isolated from the original vortex flow. Exhaust ports in communication with the conical cavity allow the substantially moisture-free airstream to be drawn from the IVS via a vent line.