Handheld Vacuum Cleaner Cyclone Design to Reduce Debris Clogging

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Solution Overview

Problem

Traditional cyclonic handheld vacuum cleaners face issues with debris clogging due to 'knife-edge' transitions in cyclone sidewalls and dust bins, leading to reduced performance.

Innovation Solution

The design incorporates a flow-diverting wall and ramp within the cyclonic separator to guide debris away from clogging points, along with a shroud to prevent re-entrainment and a tangentially aligned airflow passage to reduce pressure drop and enhance cleaning efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional cyclone sidewall design with knife-edge transitions is used, then structural simplicity is maintained, but debris clogging occurs and airflow efficiency decreases

Engineering Contradiction:

Improveairflow efficiencyVSAvoidcyclone internal structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The cyclone separator is divided into multiple functional zones: upper cyclone chamber, lower cyclone chamber, flow-diverting wall section, and ramp section. Each segment performs a specific function in guiding debris flow and preventing clogging, transforming a simple single-chamber design into a multi-zone system that systematically addresses debris flow control.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The flow-diverting wall and ramp act as intermediary structures between the upper and lower cyclone chambers. These intermediate elements redirect debris flow away from the dust bin inlet area, preventing direct contact that would cause clogging, while maintaining the overall cyclone separation function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If debris is allowed to flow directly into dust bin, then collection efficiency is maintained, but re-entrainment occurs and performance reduces

Engineering Contradiction:

Improvecleaning efficiencyVSAvoiddebris re-entrainment

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The shroud and ramp structures perform preliminary protective action by deflecting debris flow away from the dust bin inlet before re-entrainment can occur. This preemptive guidance of debris flow paths prevents the harmful effect of re-entrainment before it impacts cleaning performance.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The shroud acts as an intermediary barrier between the cyclone chamber and dust bin inlet, creating a protected flow path that guides debris safely into the dust bin without causing turbulence or re-entrainment of previously collected particles.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If airflow passage cross-sectional area is reduced, then device compactness is improved, but pressure drop increases and performance decreases

Engineering Contradiction:

Improveairflow performanceVSAvoidvacuum cleaner size

Core Design Contradiction:

ProductivityVSVolume of moving object

Solution Approach 1:

The airflow passage is designed to expand in the vertical dimension (from upstream to downstream cross-sectional area) rather than requiring increased horizontal footprint. This dimensional transition allows increased flow capacity without proportionally increasing the overall device volume, maintaining compactness while improving performance.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 minimizes debris clogging, maintains airflow efficiency, and reduces the risk of re-entrainment, improving overall performance and usability of the handheld vacuum cleaner.

Implementation Method 1

a cyclonic separator in the fluid flow path. The cyclonic separator includes a cyclone chamber having a first end wall, a second end wall, a sidewall extending along a cyclone axis, a cyclone dirty fluid inlet, and a cyclone clean fluid outlet

Methodology Applied

Scientific EffectCyclone separation: Cyclone Separation

Implementation Method 2

an airflow passage between the cyclone clean fluid outlet and the filter chamber. The airflow passage defines an upstream cross-sectional area and defines a downstream cross-sectional area. The downstream cross-sectional area is larger than the upstream cross-sectional area

Methodology Applied

Scientific EffectPressure drop reduction through area expansion: Pressure Gradient

Data Source

PatentEP3373789B1Handheld vacuum cleaner

Publication Date: 2020.01.08 TECHTRONIC IND CO LTD

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AI summary

A handheld vacuum cleaner includes a fluid flow path extending from a dirty air inlet to a clean air outlet, a main body including a handle, and a fluid flow motor positioned in the fluid flow path. The vacuum cleaner further includes a dirt collection region with an openable bottom and a cyclonic separator in the fluid flow- path. The cyclonic separator includes a cyclone chamber having a first end wall and a second end wall, a cyclone dirty fluid inlet, and a cyclone clean fluid outlet. The vacuum cleaner further includes a filter chamber in the fluid flow path downstream from the cyclonic separator and upstream from the fluid flow motor. The filter chamber includes an outlet fluidiy communicating the filter chamber and the fluid flow motor and a tangential inlet fluidiy communicating the cyclonic separator and the filter chamber.