Cyclonic Dirt Outlet Structure to Reduce Re-Entrained Dust
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Solution Overview
Problem
Cyclonic air treatment systems face inefficiencies in dirt separation and re-entrainment due to cyclonic particle velocity thresholds, particularly at low air flow rates, leading to reduced separation efficiency and increased back pressure.
Innovation Solution
The design incorporates a cyclone chamber with a dirt collection chamber connected via an axially extending dirt outlet, which is longer than its width, and multiple dirt outlet regions positioned along the cyclone chamber perimeter or axially, allowing for targeted dirt separation and reduced re-entrainment across various air flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dirt outlet is positioned at axial end of cyclone chamber, then dirt can be discharged from cyclone chamber, but disentrained dirt must be conveyed along cyclone sidewall increasing re-entrainment tendency
Solution Approach 1:
The patent transitions from a conventional axial end dirt outlet to a radial sidewall dirt outlet configuration. This dimensional change in outlet positioning allows dirt to be discharged directly from the separation region without requiring axial conveyance along the cyclone sidewall, thereby eliminating the re-entrainment pathway while maintaining effective dirt discharge.
Solution Approach 2:
The patent extracts the dirt discharge function from the axial end location and relocates it to the cyclone sidewall. This separation of the dirt outlet from the axial flow path prevents disentrained dirt from being carried along the sidewall and re-entrained into the cyclone chamber, effectively removing the harmful re-entrainment mechanism.
2Use of energy by moving object
If cyclone chamber operates at low air flow rates, then energy consumption is reduced, but particle velocity falls below separation threshold reducing separation efficiency
Solution Approach 1:
The patent modifies the physical parameters of the cyclone chamber including the dirt outlet positioning and dimensions to optimize performance across varying air flow rates. By changing the outlet configuration from axial end to radial sidewall position, the system maintains effective separation thresholds even at reduced air flow rates, allowing energy-efficient operation without sacrificing separation reliability.
3Device complexity
If axial end dirt outlet is used, then simple structure is achieved, but dirt conveyance along sidewall increases back pressure
Solution Approach 1:
The patent employs a radial dirt outlet configuration on the cyclone sidewall instead of an axial end outlet. This dimensional repositioning creates a direct discharge path for separated dirt that does not require conveyance along the cyclone sidewall, thereby reducing flow resistance and back pressure while maintaining structural simplicity.
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 configuration enhances dirt separation efficiency at both high and low air flow rates, mitigates re-entrainment, and maintains effective suction without increasing back pressure, thereby improving the overall performance of cyclonic air treatment systems.
Implementation Method 1
A cyclone has a dirt collection region. The dirt collection region may be internal of the cyclone chamber... as the air rotates in the cyclone chamber and dirt is disentrained
Implementation Method 2
as the air rotates in the cyclone chamber and dirt is disentrained, the disentrained dirt may be deposited into a dirt collection chamber
Data Source
AI summary
A cyclonic air treatment member comprises a cyclone and a dirt collection chamber external to the cyclone chamber. The cyclone chamber extends longitudinally in an axial direction between a cyclone first end and a cyclone second end. The cyclone chamber includes an axially extending dirt outlet. A removable dirt outlet insert member may be removably receivable by a portion of the dirt outlet.