Particle Filter with Curved Cross-Section for Fine Dust Separation
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Solution Overview
Problem
Existing filter systems based on inertial separation are impractical for filtering fine dust due to the need for large dimensions and high inertial forces, while mechanical filters and membranes require frequent maintenance and are economically less viable for low-mass particles.
Innovation Solution
A filter system with a separation chamber that widens in cross-section from an elliptical inlet to an asymmetrical-oval and kidney-shaped outlet section, creating cross-currents that push particles against the inner wall, and an optional flow chamber and adhesive or electrostatically charged surface to prevent re-entrance and secure particles, allowing effective filtration without additional components at low flow velocities and particle masses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inertial separation is used with high flow velocities and large particle masses, then separation effectiveness is improved, but the device becomes impractical for fine dust filtration and requires large dimensions
Solution Approach 1:
The separation chamber employs curved cross-sections (asymmetrical-oval and kidney-shaped) instead of straight or angular geometries. This curvature generates continuous cross-currents along the particle trajectory, enhancing separation effectiveness for fine dust particles while maintaining a compact device volume of approximately 6.5 mm length
Solution Approach 2:
The invention transitions from one-dimensional linear flow paths to two-dimensional cross-sectional area variations within the separation chamber. The cross-section increases from the inlet (elliptical/round) towards the outlet (kidney-shaped), creating vertical cross-currents that push particles against the chamber wall, enabling effective fine dust separation in a compact space
2Measurement precision
If mechanical filters or membranes are used for fine dust filtration, then filtration efficiency is improved, but maintenance effort and material costs increase due to frequent removal and replacement
Solution Approach 1:
The separation chamber is designed with an adhesive surface that automatically captures and retains separated particles without requiring external collection mechanisms. The adhesive property enables self-cleaning functionality where particles are naturally retained on the chamber wall, eliminating the need for frequent filter replacement and reducing maintenance effort
Solution Approach 2:
The invention replaces mechanical filtration systems (membranes, filter elements) with a fluid dynamic separation mechanism based on cross-currents generated by the curved separation chamber geometry. This substitution eliminates mechanical wear and tear associated with traditional filters while maintaining high filtration efficiency for fine dust particles
3Device complexity
If the separation chamber uses a simple series connection of inlet, separation chamber and outlet, then device complexity is reduced, but separation effectiveness for fine dust is insufficient due to particle re-entry into the fluid stream
Solution Approach 1:
The curved cross-sections of the separation chamber (asymmetrical-oval and kidney-shaped) create continuous cross-currents that push separated particles against the chamber wall, preventing their re-entry into the main fluid stream. This geometric design maintains structure simplicity while achieving high separation effectiveness for fine dust particles
Solution Approach 2:
The separation chamber employs asymmetrical cross-sections that vary along the flow direction, with the cross-sectional area increasing from inlet to outlet. This asymmetrical geometry generates optimized cross-current patterns that effectively separate fine dust particles while maintaining a simple series connection structure without additional collection chambers
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
Enables efficient separation of fine dust particles down to 5.5 micrometers without mechanical filters or membranes, minimizing maintenance and filter size, with improved filtration efficiency and ease of cleaning by reversing fluid flow and using an adhesive or electrostatic surface.
Implementation Method 1
Filter devices are known from the prior art (US20160312698A1) which function on the basis of the principle of inertial separation. Separation takes place in such devices exclusively by deflecting the air flow, as a result of which the particles to be filtered are diverted away from the outlet for the cleaned fluid
Implementation Method 2
the geometric design and the cross-sectional changes along the separation chamber mean that when the fluid flows into the separation chamber, cross currents are caused that push the particles to be separated against the inner wall
Implementation Method 3
The invention relates to a device for filtering particles by means of inertial and gravity separation
Data Source
Figure 1
Figure 2~5
AI summary
1. A device for filtering particles by means of inertial and gravity separation is described, comprising a filter unit (1) extending between an inlet (2) and an outlet (3) and having a separation chamber (4). To design a simple filter system capable of separating small particles in the fine dust range even at low flow velocities and particle masses, while avoiding wear parts and minimizing maintenance, it is proposed that the separation chamber (4), extending in a main flow direction, widens in cross-section from the inlet (2) with an elliptical cross-section and, towards the outlet (3), successively comprises a section (5) with an asymmetric oval cross-section and a section (6) with a kidney-shaped cross-section, and that the outlet (3) is laterally offset relative to the inlet (2).