Centrifugal Particle Separator With Low-Turbulence Vortex Inlet
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Solution Overview
Problem
Conventional bagless vacuum cleaners face inefficiencies in capturing particles smaller than 5 microns and suffer from re-entrainment of particulates due to turbulence in the air stream, particularly caused by vanes or deflectors used to create rotary motion, leading to incomplete separation and reduced cleanliness of the exhaust air.
Innovation Solution
The apparatus incorporates a transition zone with a diameter greater than the inlet zone to induce vortical flow with minimal fluid perturbation, featuring a coaxial or tangential inlet and centrifugal separation zones, and includes a baffle or scroll entry port to enhance centrifugal separation, reducing turbulence and re-entrainment by ensuring particles are separated from the exhaust flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vanes or deflectors are used to create rotary motion in the particle-laden air stream, then centrifugal force is increased to improve particle separation, but turbulence is induced causing re-entrainment of particles and reduced separation efficiency
Solution Approach 1:
The patent applies preliminary action by pre-organizing the air stream into a controlled vortex pattern before it enters the main separation zone. The vortex finder and inlet geometry are designed to induce rotation upstream, allowing particles to be gradually separated without sudden turbulence that would cause re-entrainment. This preparatory vortex formation enables efficient separation while minimizing harmful turbulence effects.
Solution Approach 2:
The vortex finder acts as an intermediary element between the inlet and separation zones. It mediates the transition by controlling the introduction of rotational motion and regulating the air stream's path. This intermediary structure allows the system to achieve the necessary centrifugal force for particle separation while maintaining laminar flow conditions that prevent re-entrainment of separated particles.
2Measurement precision
If a tangential inlet tube is used to increase rotational velocity and centrifugal force, then particle separation capability is improved, but failure to achieve a clean cut between de-entrained particles and exhaust air occurs
Solution Approach 1:
The patent applies segmentation by dividing the separation chamber into distinct functional zones: an inlet zone for introducing the air stream, a vortex development zone for inducing rotation, and a separation zone with a vortex finder for particle-exhaust separation. This segmentation creates clear spatial boundaries that enable a clean cut between de-entrained particles and exhaust air, with the vortex finder serving as the precise separation interface between zones.
Solution Approach 2:
The patent introduces a vertical dimension to the separation process by positioning the vortex finder as a horizontal barrier that intercepts the rotating air stream. Particles are separated in the radial direction by centrifugal force, then the vortex finder provides an additional separation plane that prevents particle migration into the exhaust stream. This multi-dimensional approach ensures complete separation between particles and exhaust air.
3Quantity of substance
If conventional centrifugal separators are used, then particles larger than 5 microns can be captured, but smaller particles are not effectively captured and re-entrainment occurs in the exhaust airflow
Solution Approach 1:
The patent applies parameter changes by optimizing the vortex finder diameter ratio (typically 0.2-0.4 of the separator diameter), the inlet velocity, and the rotational speed to enhance separation efficiency for fine particles. By carefully controlling these parameters, the system achieves effective capture of particles down to smaller sizes while maintaining exhaust air cleanliness and preventing re-entrainment through optimized flow conditions.
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 high efficiency in separating a wide range of particle sizes and densities with low pressure drop, minimizing re-entrainment and maintaining separation efficiency, even for smaller particles, by inducing vortical flow and using a centrifugal separation mechanism that separates particles from the exhaust stream effectively.
Implementation Method 1
a transition zone for inducing vortical flow in the fluid stream
Implementation Method 2
the centrifugal force acting on the particles entrained therein, as the air stream is constrained in a pathway of decreasing diameter
Implementation Method 3
Bagless vacuum cleaners separate particulate matter from an air stream entraining such particles by subjecting the air stream to a vortex in a centrifugal separator
Implementation Method 4
dust and other dirt particles settling under gravity for collection and disposal as the air stream loses its velocity
Data Source
AI summary
Apparatus for separation of particles from a fluid stream entraining said particles comprises an inlet zone, a centrifugal separation zone, particles collection means and exhaust means, in which the inlet and separation zones are in communication via a transition zone for inducing vortical flow in the fluid stream, the transition zone having a diameter greater than the diameter of the inlet zone and comprising means defining an outlet port to the separation zone, an entry port being formed in the transition zone upstream of the baffle means, the entry and outlet ports being mutually arranged to minimise fluid perturbation in the fluid stream in use.